Zodiac Super OZ/MEDIADEPOT.ISO/FILES/13/VBPRNT20.ZIP/VBPRINT.DOC

Text File | 1996-05-31 | 30KB | 737 lines

VBPRINT Library v2.00 written by Robert Simpson (Black Castle Software, LLC)

This program has been released to the public domain.  No warranties are
expressed or implied.  Use at your own risk.

---Overview---
This DLL allows your Visual Basic applications to have better control over the
printer device.  It seems to be the one area MS has consistently forgotten in
VB.

By far the easiest method for changing printer orientation, paper settings,
trays, color and etc is to use the DEVMODE structure and make calls to the
printer driver's ExtDeviceMode() function.  Unfortunately this particular
function resides in the printer driver itself and VB cannot load that driver
and call pointers to functions within it.  Therefore, I have written a set of
printer control functions which do exactly that.  In addition, using the
VBResetDC() function, you can make changes to the printer orientation and
other settings during a print session (even if you're using VB's Printer
object).

One of the problems of course is that not all DEVMODE structures are created
equal.  Depending on the printer, the driver may append its own private data
to the end of a DEVMODE structure, which further complicates the VB interface.
The trick here is that all calls to VBPRINT use a special DEVMODE structure
which I've modified for use with VB (hence called the VBDEVMODE).  This
VBDEVMODE allows the VB Programmer access to all the important items in the
DEVMODE structure and still allows the printer to have its own private area.


---Features---
Ability to get/set the Windows default printer
Ability to list all the installed printers
Allows VB to call the ExtDeviceMode() function of a printer
Also allows VB to call the DeviceCapabilities() function of a printer
Has special VB version of ResetDC() to change printer settings on the fly
Uses a special DEVMODE structure specifically tailored for VB
Can convert a VBDEVMODE structure from and to a VB String so it can be easily
saved to disk and restored later
What this means is, you now have an easy method for changing print orientation
and any other printer settings through the use of the VBDEVMODE structure.


---Flavors of this Library (and why there ARE flavors!!)---
This library comes in 3 flavors so just about any VB programmer can use it

A VB3 version of the DLL (which is compatible with VB4/16-bit)
A VB4/16-bit version (which is NOT compatible with VB3!!)
A VB4/32-bit version (who's functions are identical to the VB4/16-bit version)

Why is the VB3 version compatible with VB4 and the VB4 version not compatible
with VB3?  I decided that I wanted the VB4/32-bit and VB4/16-bit versions to
be functionally identical, which meant that I had to allow for the fact that
VB4/32-bit uses UNICODE strings (16-bits per character), and therefore I could
not always write directly into memory because VB4 often does some unwanted
translations when making function calls.

The particular function affected (and the ONLY one affected) is the
VBDeviceCapabilities() function.  In the VB3 version, there is only ONE
command, VBDeviceCapabilities().  Often this function returns an array of data
to the user, which is no problem in VB3 or VB4/16-bit, you just pass the first
dimension of the array (such as Names$(0) ) and the DLL can write all the
elements of the array since they're stored linearly in memory.
NOT SO in VB4/32-bit!!  If you pass Names$(0) to a DLL, VB4 translates it from
UNICODE to ANSI and gives you a new pointer to JUST THAT DIMENSION, leaving me
no place to put the rest of the items that are supposed to go in the array.

Therefore in order to make your VB code portable from 16-bits to 32-bits,
the VB4 versions of the DLL have a VBDeviceCapArray() function, which is
just an Alias to "VBDeviceCapabilities" but one that explicitly requires an
array variable, which you would pass as Names$() (with NO numbers between the
parens!).

So if you are porting a VB3 program to use the NEW VB4 VBPRNTxx library, you
will need to replace commands such as:

  i = VBDeviceCapabilities(DefPrinter$,DC_PAPERNAMES,Names$(0),inDEV)

to the new format for arrays in the VB4 version:

  i = VBDeviceCapArray(DefPrinter$,DC_PAPERNAMES,Names$(),inDEV)

**THIS IS THE ONLY DIFFERENCE IN FUNCTION CALLS**


---Using this DLL with the Printer Object---
Most printing in VB goes through the Printer object, which leaves much to be
desired.  Normally in the Windows API you can pass a DEVMODE structure when
you create a device context, which makes life much easier--you can include all
your custom printer settings in the device open sequence and not have to
bother with a bunch of subsequent Escape() functions.
The VB Printer object doesn't allow this convenience.  Therefore if you must
use the VB Printer object, you have two options:
(Assuming you've already got a VBDEVMODE structure filled in with your desired
settings)
#1
Use the Printer object's .hDC property and call VBResetDC() with the filled-
in VBDEVMODE structure.  This is the easiest method...or...

#2
Call VBExtDeviceMode() and get the printer's current settings (see the
functions reference for instructions on doing this)

Make another call to VBExtDeviceMode() with your DEVMODE structure and tell
the printer to use these settings as the new default settings.

Use the Printer object to your heart's content

When finished, one more call to VBExtDeviceMode() with the old default
settings, restoring them back to the original.

Using the utilities in this DLL, you'll be able to change printers, use them
in ways you were unable to do previously, and change back to the default
printer all without an annoying dialog box or having to prompt the user.


---The DEVMODE structure---
If you're familiar with the DEVMODE structure, this one should look strikingly
similar.

Type DEVMODE_TYPE
  dmDeviceName As String * 32 ' VB4/32 uses an array of Byte
  dmSpecVersion As Integer
  dmDriverVersion As Integer
  dmSize As Integer
  dmDriverExtra As Integer
  dmFields As Long
  dmOrientation As Integer
  dmPaperSize As Integer
  dmPaperLength As Integer
  dmPaperWidth As Integer
  dmScale As Integer
  dmCopies As Integer
  dmDefaultSource As Integer
  dmPrintQuality As Integer
  dmColor As Integer
  dmDuplex As Integer
  dmYResolution As Integer
  dmTTOption As Integer
  dmPrivate As String
End Type

The 32-bit version adds several items to the above structure, and uses arrays
of Byte instead of fixed-length strings because of the fact that strings are
stored internally in UNICODE format (which means they're twice as large)


The following is an exerpt from the Win3.1 SDK describing the elements of the
DEVMODE structure:

dmDeviceName
Specifies the name of the device the driver supports--for example, "PCL/HP
LaserJet" in the case of the Hewlett-Packard LaserJet. Each driver has a
unique string.

dmSpecVersion
Specifies the version number of the DEVMODE structure. For Windows version
3.1, this value should be 0x30A.

dmDriverVersion
Specifies the printer driver version number assigned by the printer driver
developer.

dmSize
Specifies the size, in bytes, of the DEVMODE structure. (This value does not
include the optional dmDriverData member for device-specific data, which can
follow the structure.) If an application manipulates only the driver-
independent portion of the data, it can use this member to find out the length
of the structure without having to account for different versions.

dmDriverExtra
Specifies the size, in bytes, of the optional dmDriverData member for device-
specific data, which can follow the structure. If an application does not use
device-specific information, it should set this member to zero.

dmFields
Specifies a set of flags that indicate which of the remaining members in the
DEVMODE structure have been initialized. It can be any combination (or it can
be none) of the following values:

Constant        Value

DM_ORIENTATION        0x0000001L
DM_PAPERSIZE        0x0000002L
DM_PAPERLENGTH        0x0000004L
DM_PAPERWIDTH        0x0000008L
DM_SCALE        0x0000010L
DM_COPIES        0x0000100L
DM_DEFAULTSOURCE    0x0000200L
DM_PRINTQUALITY        0x0000400L
DM_COLOR        0x0000800L
DM_DUPLEX        0x0001000L
DM_YRESOLUTION        0x0002000L
DM_TTOPTION        0x0004000L

A printer driver supports only those members that are appropriate for the
printer technology.

dmOrientation
Specifies the orientation of the paper. It can be either DMORIENT_PORTRAIT or
DMORIENT_LANDSCAPE.

dmPaperSize
Specifies the size of the paper to print on. This member may be set to zero if
the length and width of the paper are specified by the dmPaperLength and
dmPaperWidth members, respectively. Otherwise, the dmPaperSize member can be
set to one of the following predefined values:

Value            Meaning

DMPAPER_FIRST        DMPAPER_LETTER
DMPAPER_LETTER        Letter, 8 1/2 x 11 in.
DMPAPER_LETTERSMALL    Letter Small, 8 1/2 x 11 in.
DMPAPER_TABLOID        Tabloid, 11 x 17 in.
DMPAPER_LEDGER        Ledger, 17 x 11 in.
DMPAPER_LEGAL        Legal, 8 1/2 x 14 in.
DMPAPER_STATEMENT    Statement, 5 1/2 x 8 1/2 in.
DMPAPER_EXECUTIVE    Executive, 7 1/2 x 10 1/2 in.
DMPAPER_A3        A3, 297 x 420 mm
DMPAPER_A4        A4, 210 x 297 mm
DMPAPER_A4SMALL        A4 Small, 210 x 297 mm
DMPAPER_A5        A5, 148 x 210 mm
DMPAPER_B4        B4, 250 x 354 mm
DMPAPER_B5        B5, 182 x 257 mm
DMPAPER_FOLIO        Folio, 8 1/2 x 13 in.
DMPAPER_QUARTO        Quarto, 215 x 275 mm

DMPAPER_10X14        10 x 14 in.
DMPAPER_11X17        11 x 17 in.
DMPAPER_NOTE        Note, 8 1/2 x 11 in.
DMPAPER_ENV_9        Envelope #9, 3 7/8 x 8 7/8 in.
DMPAPER_ENV_10        Envelope #10, 4 1/8 x 9 1/2 in.
DMPAPER_ENV_11        Envelope #11, 4 1/2 x 10 3/8 in.
DMPAPER_ENV_12        Envelope #12, 4 1/2 x 11 in.
DMPAPER_ENV_14        Envelope #14, 5 x 11 1/2 in.
DMPAPER_CSHEET        C size sheet
DMPAPER_DSHEET        D size sheet
DMPAPER_ESHEET        E size sheet
DMPAPER_ENV_DL        Envelope DL, 110 x 220 mm
DMPAPER_ENV_C3        Envelope C3, 324 x 458 mm
DMPAPER_ENV_C4        Envelope C4, 229 x 324 mm
DMPAPER_ENV_C5        Envelope C5, 162 x 229 mm

DMPAPER_ENV_C6        Envelope C6, 114 x 162 mm
DMPAPER_ENV_C65        Envelope C65, 114 x 229 mm
DMPAPER_ENV_B4        Envelope B4, 250 x 353 mm
DMPAPER_ENV_B5        Envelope B5, 176 x 250 mm
DMPAPER_ENV_B6        Envelope B6, 176 x 125 mm
DMPAPER_ENV_ITALY    Envelope, 110 x 230 mm
DMPAPER_ENV_MONARCH    Envelope Monarch, 3 7/8 x 7 1/2 in.
DMPAPER_ENV_PERSONAL    Envelope, 3 5/8 x 6 1/2 in.
DMPAPER_FANFOLD_US    U.S. Standard Fanfold, 14 7/8 x 11 in.
DMPAPER_FANFOLD_STD_GERMAN    German Standard Fanfold, 8 1/2 x 12 in.
DMPAPER_FANFOLD_LGL_GERMAN    German Legal Fanfold, 8 1/2 x 13 in.

DMPAPER_LAST        German Legal Fanfold, 8 1/2 x 13 in.
DMPAPER_USER        User-defined

dmPaperLength
Specifies a paper length, in tenths of a millimeter. This parameter overrides
the paper length specified by the dmPaperSize member, either for custom paper
sizes or for such devices as dot-matrix printers that can print on a variety
of page sizes.

dmPaperWidth
Specifies a paper width, in tenths of a millimeter. This parameter overrides
the paper width specified by the dmPaperSize member.

dmScale
Specifies the factor by which the printed output is to be scaled. The
apparent page size is scaled from the physical page size by a factor of
dmScale/100. For example, a letter-size paper with a dmScale value of 50 would
contain as much data as a page of size 17 by 22 inches because the output text
and graphics would be half their original height and width.

dmCopies
Specifies the number of copies printed if the device supports multiple-page
copies.

dmDefaultSource
Specifies the default bin from which the paper is fed. The application can
override this value by using the GETSETPAPERBINS escape. This member can be
one of the following values:

DMBIN_AUTO        DMBIN_LOWER
DMBIN_CASSETTE        DMBIN_MANUAL
DMBIN_ENVELOPE        DMBIN_MIDDLE
DMBIN_ENVMANUAL        DMBIN_ONLYONE
DMBIN_FIRST        DMBIN_SMALLFMT
DMBIN_LARGECAPACITY    DMBIN_TRACTOR
DMBIN_LARGEFMT        DMBIN_UPPER
DMBIN_LAST

A range of values is reserved for device-specific bins. To be consistent with
initialization information, the GETSETPAPERBINS and ENUMPAPERBINS escapes use
these values.

dmPrintQuality
Specifies the printer resolution. Following are the four predefined device-
independent values:

DMRES_HIGH     (-4)
DMRES_MEDIUM     (-3)
DMRES_LOW     (-2)
DMRES_DRAFT     (-1)

If a positive value is given, it specifies the number of dots per inch (DPI)
and is therefore device-dependent.  If the printer initializes the
dmYResolution member, the dmPrintQuality member specifies the x-resolution
of the printer, in dots per inch.

dmColor
Specifies whether a color printer is to render color or monochrome output.
Possible values are:

DMCOLOR_COLOR         (1)
DMCOLOR_MONOCHROME     (2)

dmDuplex
Specifies duplex (double-sided) printing for printers capable of duplex
printing. This member can be one of the following values:

DMDUP_SIMPLEX     (1)
DMDUP_HORIZONTAL (2)
DMDUP_VERTICAL     (3)

dmYResolution
Specifies the y-resolution of the printer, in dots per inch. If the printer
initializes this member, the dmPrintQuality member specifies the x-resolution
of the printer, in dots per inch.

dmTTOption
Specifies how TrueType fonts should be printed. It can be one of the following
values:

Value           Meaning

DMTT_BITMAP    Print TrueType fonts as graphics. This is the default action
for dot-matrix printers.

DMTT_DOWNLOAD    Download TrueType fonts as soft fonts. This is the default
action for Hewlett-Packard printers that use Printer Control Language (PCL).

DMTT_SUBDEV    Substitute device fonts for TrueType fonts. This is the
default action for PostScript printers.


-----------------------------------------------------------------------------
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------


VBPRINT Library Function Reference:


---General Notes---
The VBDeviceCapabilities() function call is different in the VB3 version of
the DLL.  While VB4.0/16-bit is fully compatible with it and your VB3 apps
will port flawlessly to VB4/16-bit, you will have to make some modifications
to your code if you want to port it to VB4/32-bit.

However, if you are writing in native VB4 and not coming from VB3, DO NOT USE
VBPRINT.DLL IF YOU DON'T HAVE TO!  Use the VB4 versions instead so that your
16-bit and 32-bit VB programs will be fully compatible.


---Functions---

Declare:
Declare Function VBGetPrinters() As String

Example Usage:
NextPrinter$ = VBGetPrinters()

Description:
This function works similar to the Dir$() VB function.  Each time you call
VBGetPrinters() it returns the next printer installed on the computer.  It
will return a NULL string when it has reached the end of the list.

Returns:
String
The format for printers returned with this function (and the format for all
functions requiring a printername) is:
<printername> on <port>

Example:
Epson Stylus Pro on LPT1:
-----------------------------------------------------------------------------

Declare:
Declare Function VBGetDefPrinter() As String

Example Usage:
DefPrinter$ = VBGetDefPrinter()

Returns:
String
This function returns the Windows default printer in the same format as the
VBGetPrinters() function above.
-----------------------------------------------------------------------------

Declare:
Declare Function VBSetDefPrinter(DefPrinter As String) As Integer

Example Usage:
i = VBSetDefPrinter(DefPrinter$)

Description:
This function sets a new Windows Default printer.

Returns:
Integer
 0 = (False) Unable to determine the printer's driver (typically printer not
     installed)
-1 = (True) Success
-----------------------------------------------------------------------------

Declare:
Declare Function VBGetDriverFromName Lib "vbprint.dll" (printername As String)
As String

Example Usage:
Driver$ = VBGetDriverFromName(DefPrinter$)

Description:
This function returns the driver associated with a printer.  This is the
actual .DRV file that handles the printer.  It's of little use other than for
reference purposes only.

Returns:
String
-----------------------------------------------------------------------------

Declare:
Declare Function VBDevModeToStr Lib "vbprint.dll" (inDev As DEVMODE_TYPE) As
String

Example Usage:
Devmode$ = VBDevModeToStr(dmINPUT)

Description:
This function converts a VBDEVMODE structure to a string so that it can be
easily saved to disk and/or restored later.

Returns
String
-----------------------------------------------------------------------------

Declare:
Declare Function VBStrToDevMode Lib "vbprint.dll" (dmString As String, outDev
As DEVMODE_TYPE) As Integer

Example Usage:
i = VBStrToDevMode(Devmode$,dmOUTPUT)

Description:
This function takes a string created with VBDevModeToStr() and dumps it into
the specified VBDEVMODE structure, thereby restoring it back so you can once
again easily edit it.

Returns:
Integer
True  = Success
False = Fail (of course)
-----------------------------------------------------------------------------

Declare:
Declare Function VBExtDeviceMode Lib "vbprint.dll" (ByVal hWnd As Integer,
printername As String, inDev As DEVMODE_TYPE, outDev As DEVMODE_TYPE, ByVal
fMode As Integer) As Integer

Inputs:
  hWnd        The parent window if you wish to open the printer's setup
                dialog.  Can be 0 otherwise.
  printername   The name and port of the printer to configure (formatted the
                same as all the other functions that refer to printers)
  inDev         Input VBDEVMODE the printer driver should use.  It can get its
                settings from here.
  outDev        Output VBDEVMODE.  The printer will return its current/default
                settings here.
  fMode         Flags that tell the printer driver what to do with the data
                you just sent.  Flags are as follows (any combo can be used)

                DM_IN_BUFFER    Instructs the driver to get its new settings
                                from the supplied inDev VBDEVMODE
                DM_OUT_BUFFER   Tells the driver to dump its current settings
                                into the supplied outDev VBDEVMODE
                DM_IN_PROMPT    Brings up the printer's own settings dialog
                                and allows the user to manually change things
                DM_OUT_DEFAULT  All changes to the printer's settings are to
                                be written out as the new Windows defaults for
                                that printer

Description:
This is the one you've been waiting for.  This function calls the printer's
ExtDeviceMode() function, allowing you to give the printer new settings, get
its current settings, or update the Windows default settings.

Notes:
Do not use the same VBDEVMODE for input as you do for output.  The results may
be unreliable at best.

Examples:
i = VBExtDeviceMode(Me.hWnd,DefPrinter$,dmINPUT,dmOUTPUT,DM_OUT_BUFFER)

' Gets the printer's current settings and puts them in dmOUTPUT

i = VBExtDeviceMode(Me.hWnd,DefPrinter$,dmINPUT,dmOUTPUT,DM_IN_BUFFER Or
DM_OUT_DEFAULT)

' Tells the printer to use the settings in dmINPUT and to make them the new
' default settings for the printer

i = VBExtDeviceMode(Me.hWnd,DefPrinter$,dmINPUT,dmOUTPUT,DM_IN_BUFFER Or
DM_IN_PROMPT Or DM_OUT_BUFFER)

' Tells the printer driver to bring up its custom dialog using the settings
' supplied in dmINPUT.  Allows the user to change anything, and the final
' settings will be placed in dmOUTPUT

Returns:
Integer
This function returns whatever the ExtDeviceMode() returns.  Usually IDOK or
IDCANCEL if using the printer's dialog box.  Otherwise it will usually
return 1 for success.  It can return the size of the DEVMODE structure if no
flags are specified in the original function call.  There are two more
returns:

False = Unable to open the printer driver
True  = Unable to determine the size of the DEVMODE structure
-----------------------------------------------------------------------------

Declare:
Declare Function VBDeviceCapabilities Lib "vbprint.dll" (printername As
String, Cap As Integer, lpszOutput As Any, inDev As DEVMODE_TYPE) As Long

 --and (VB4 versions only)--

Declare Function VBDeviceCapArray Lib "vbprntxx.dll" Alias
"VBDeviceCapabilities" (printername As String, Cap As Integer, lpszOutput() As
Any, inDev As DEVMODE_TYPE) As Long

Inputs:
  printername   The name and port of the printer to query (formatted the
                same as all the other functions that refer to printers)
  Cap           The particular capability you wish to query.  Cap can be one
                of the following (taken directly from the Win3.1 SDK)

                Value   Meaning

DC_BINNAMES     Copies an array containing a list of the names of the paper
                bins. This array is in the form char PaperNames[cBinMax]
                [cchBinName] where cchBinName is 24. If the lpszOutput
                parameter is NULL, the return value is the number of bin
                entries required. Otherwise, the return value is the number
                of bins copied.

DC_BINS         Retrieves a list of available bins. The function copies the
                list to the lpszOutput parameter as a WORD array. If
                lpszOutput is NULL, the function returns the number of
                supported bins to allow the application the opportunity to
                allocate a buffer with the correct size. For more information
                about these bins, see the description of the dmDefaultSource
                member of the DEVMODE structure.

DC_COPIES       Returns the number of copies the device can print.

DC_DRIVER       Returns the version number of the printer driver.

DC_DUPLEX       Returns the level of duplex support. The function returns 1 if
                the printer is capable of duplex printing. Otherwise, the
                return value is zero.

DC_ENUMRESOLUTIONS     Returns a list of available resolutions. If lpszOutput
                is NULL, the function returns the number of available
                resolution configurations. Resolutions are represented by
                pairs of LONG integers representing the horizontal and
                vertical resolutions (specified in dots per inch).
DC_EXTRA        Returns the number of bytes required for the device-specific
                portion of the DEVMODE structure for the printer driver.

DC_FIELDS       Returns the dmFields member of the printer driver's DEVMODE
                structure. The dmFields member indicates which fields in the
                device-independent portion of the structure are supported by
                the printer driver.

DC_FILEDEPENDENCIES    Returns a list of files that also need to be loaded
                when a driver is installed. If the lpszOutput parameter is
                NULL, the function returns the number of files. Otherwise,
                lpszOutput points to an array of filenames in the form
                char[chFileName, 64]. Each filename is a null-terminated
                string.

DC_MAXEXTENT    Returns a POINT structure containing the maximum paper size
                that the dmPaperLength and dmPaperWidth members of the printer
                driver's DEVMODE structure can specify.

DC_MINEXTENT    Returns a POINT structure containing the minimum paper size
                that the dmPaperLength and dmPaperWidth members of the printer
                driver's DEVMODE structure can specify.

DC_ORIENTATION  Returns the relationship between portrait and landscape
                orientations for a device, in terms of the number of degrees
                that portrait orientation is rotated counterclockwise to
                produce landscape orientation. The return value can be one of
                the following:

                Value   Meaning

                 0      No landscape orientation.
                 90     Portrait is rotated 90 degrees to produce landscape.
                        (For example, Hewlett-Packard PCL printers.)
                 270    Portrait is rotated 270 degrees to produce landscape.
                        (For example, dot-matrix printers.)

DC_PAPERNAMES  Retrieves a list of supported paper names--for example, Letter
               or Legal. If the lpszOutput parameter is NULL, the function
               returns the number of paper sizes available. Otherwise,
               lpszOutput points to an array for the paper names in the form
               char[cPaperNames, 64]. Each paper name is a null-terminated
               string.

DC_PAPERS      Retrieves a list of supported paper sizes. The function copies
               the list to lpszOutput as a WORD array and returns the number
               of entries in the array. If lpszOutput is NULL, the function
               returns the number of supported paper sizes to allow the
               application the opportunity to allocate a buffer with the
               correct size. For more information on paper sizes, see the
               description of the dmPaperSize member of the DEVMODE structure.

DC_PAPERSIZE   Copies the dimensions of all supported paper sizes, in tenths
               of a millimeter, to an array of POINT structures pointed to by
               the lpszOutput parameter. The width (x-dimension) and length
               (y-dimension) of a paper size are returned as if the paper
               were in the DMORIENT_PORTRAIT orientation.

DC_SIZE        Returns the dmSize member of the printer driver's DEVMODE
               structure.

DC_TRUETYPE    Retrieves the abilities of the driver to use TrueType fonts.
               The return value can be one or more of the following:

                Value  Meaning

                DCTT_BITMAP    Device is capable of printing TrueType fonts
                               as graphics. (For example, dot-matrix and PCL
                               printers.)
                DCTT_DOWNLOAD  Device is capable of downloading TrueType
                               fonts. (For example, PCL and PostScript
                               printers.)
                DCTT_SUBDEV    Device is capable of substituting device fonts
                               for TrueType fonts. (For example, PostScript
                               printers.)

                For DC_TRUETYPE, the lpszOutput parameter should be NULL.

DC_VERSION     Returns the specification version to which the printer driver
               conforms.



  lpszOutput    Usually an array of some type or another (depending on the
                capability you are querying).  See notes below on how to
                properly pass an array here.
  InDev         A VBDEVMODE structure.  The printer driver can get its info
                either from this structure (if filled in) or will get its
                info from the default settings if you do not fill it in.

Description:
This function calls the DeviceCapabilities() printer driver function to query
the printer on a particular feature that it may have.  This can be used to
obtain the list of available paper types, get info on paper bins and even the
types of print resolutions (DPI) available.

Notes:
When querying the device on a parameter that returns an array of data, you
should first query it with a 0 lpszOutput parameter.  Example:

l = VBDeviceCapabilities(DefPrinter$, DC_PAPERNAMES, ByVal 0&, inDev)

This will return the number of papernames the device uses.  The "ByVal 0&" is
very important.  DO NOT USE  NULL  OR FORGET THE "&"!!  The input param will
be expecting a Long, so don't give it anything else.
Once you've DIMmed an array to hold the data, you can then call it again with
the destination array:

(VB3 library version)
l = VBDeviceCapabilities(DefPrinter$, DC_PAPERNAMES, Names$(0), inDev)

(VB4 16/32 bit library version)
l = VBDeviceCapArray(DefPrinter$, DC_PAPERNAMES, Names$(), inDev)

For the VB3 version of this function, always reference the first element in
the array in the function call (in this case, Name$(0) since 0 is typically
the first element in any array).

For VB4, do not mention ANY element in the array, just pass the whole array.

The VB3 module VBPRINT.BAS (VBPRNT32.BAS for VB4) contains easy-to-use "Types"
(structures) that will make it easier for you to call the queries that return
arrays.  In the VBPRINT.FRM (VBPRNT32.FRM for VB4) file, the Sub ShowOptions
gives several practical examples of making this call using the Type's from
the .BAS file.

Returns:
Long
False = Failure
Anything else is success.
-----------------------------------------------------------------------------

Declare:
Declare Function VBResetDC(ByVal hDC As Integer, outDev As DEVMODE_TYPE) As
Integer

Inputs:
  hDC           The device context to reset
  outDev        A new DEVMODE structure containing any new settings to give
                the opened device

Description:
The VBResetDC function updates the given device context, based on the
information in the specified DEVMODE structure.  Among other things, this
command can be used to change the paper orientation or paper bins during a
print session.

Returns:
Integer
The return value is the handle of the original device context if the function
is successful.  Otherwise, it is False.
-----------------------------------------------------------------------------


Robert Simpson
Programmer at Large
BC Software
Phx, AZ
[e-mail]