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Programming Windows 95
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CHAP19
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STRPROG.C
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C/C++ Source or Header
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1995-12-31
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6KB
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200 lines
/*--------------------------------------------------------
STRPROG.C -- Program using STRLIB dynamic link library
(c) Charles Petzold, 1996
--------------------------------------------------------*/
#include <windows.h>
#include <string.h>
#include "strprog.h"
#include "strlib.h"
#define MAXLEN 32
#define WM_DATACHANGE WM_USER
typedef struct
{
HDC hdc ;
int xText ;
int yText ;
int xStart ;
int yStart ;
int xIncr ;
int yIncr ;
int xMax ;
int yMax ;
}
CBPARAM ;
LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
char szAppName[] = "StrProg" ;
char szString[MAXLEN] ;
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
HWND hwnd ;
MSG msg ;
WNDCLASSEX wndclass ;
wndclass.cbSize = sizeof (wndclass) ;
wndclass.style = CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra = 0 ;
wndclass.hInstance = hInstance ;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ;
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ;
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
wndclass.lpszMenuName = szAppName ;
wndclass.lpszClassName = szAppName ;
wndclass.hIconSm = LoadIcon (NULL, IDI_APPLICATION) ;
RegisterClassEx (&wndclass) ;
hwnd = CreateWindow (szAppName, "DLL Demonstration Program",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
CW_USEDEFAULT, CW_USEDEFAULT,
NULL, NULL, hInstance, NULL) ;
ShowWindow (hwnd, iCmdShow) ;
UpdateWindow (hwnd) ;
while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg) ;
DispatchMessage (&msg) ;
}
return msg.wParam ;
}
BOOL CALLBACK DlgProc (HWND hDlg, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
switch (iMsg)
{
case WM_INITDIALOG :
SendDlgItemMessage (hDlg, IDD_STRING, EM_LIMITTEXT,
MAXLEN - 1, 0) ;
return TRUE ;
case WM_COMMAND :
switch (wParam)
{
case IDOK :
GetDlgItemText (hDlg, IDD_STRING, szString, MAXLEN) ;
EndDialog (hDlg, TRUE) ;
return TRUE ;
case IDCANCEL :
EndDialog (hDlg, FALSE) ;
return TRUE ;
}
}
return FALSE ;
}
BOOL CALLBACK EnumCallBack (HWND hwnd, LPARAM lParam)
{
char szClassName[16] ;
GetClassName (hwnd, szClassName, sizeof (szClassName)) ;
if (0 == strcmp (szClassName, szAppName))
SendMessage (hwnd, WM_DATACHANGE, 0, 0) ;
return TRUE ;
}
BOOL CALLBACK GetStrCallBack (PSTR pString, CBPARAM *pcbp)
{
TextOut (pcbp->hdc, pcbp->xText, pcbp->yText,
pString, strlen (pString)) ;
if ((pcbp->yText += pcbp->yIncr) > pcbp->yMax)
{
pcbp->yText = pcbp->yStart ;
if ((pcbp->xText += pcbp->xIncr) > pcbp->xMax)
return FALSE ;
}
return TRUE ;
}
LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
static HINSTANCE hInst ;
static int cxChar, cyChar, cxClient, cyClient ;
CBPARAM cbparam ;
HDC hdc ;
PAINTSTRUCT ps ;
TEXTMETRIC tm ;
switch (iMsg)
{
case WM_CREATE :
hInst = ((LPCREATESTRUCT) lParam)->hInstance ;
hdc = GetDC (hwnd) ;
GetTextMetrics (hdc, &tm) ;
cxChar = (int) tm.tmAveCharWidth ;
cyChar = (int) (tm.tmHeight + tm.tmExternalLeading) ;
ReleaseDC (hwnd, hdc) ;
return 0 ;
case WM_COMMAND :
switch (wParam)
{
case IDM_ENTER :
if (DialogBox (hInst, "EnterDlg", hwnd, &DlgProc))
{
if (AddString (szString))
EnumWindows (&EnumCallBack, 0) ;
else
MessageBeep (0) ;
}
break ;
case IDM_DELETE :
if (DialogBox (hInst, "DeleteDlg", hwnd, &DlgProc))
{
if (DeleteString (szString))
EnumWindows (&EnumCallBack, 0) ;
else
MessageBeep (0) ;
}
break ;
}
return 0 ;
case WM_SIZE :
cxClient = (int) LOWORD (lParam) ;
cyClient = (int) HIWORD (lParam) ;
return 0 ;
case WM_DATACHANGE :
InvalidateRect (hwnd, NULL, TRUE) ;
return 0 ;
case WM_PAINT :
hdc = BeginPaint (hwnd, &ps) ;
cbparam.hdc = hdc ;
cbparam.xText = cbparam.xStart = cxChar ;
cbparam.yText = cbparam.yStart = cyChar ;
cbparam.xIncr = cxChar * MAXLEN ;
cbparam.yIncr = cyChar ;
cbparam.xMax = cbparam.xIncr * (1 + cxClient / cbparam.xIncr) ;
cbparam.yMax = cyChar * (cyClient / cyChar - 1) ;
GetStrings ((PSTRCB) GetStrCallBack, (PVOID) &cbparam) ;
EndPaint (hwnd, &ps) ;
return 0 ;
case WM_DESTROY :
PostQuitMessage (0) ;
return 0 ;
}
return DefWindowProc (hwnd, iMsg, wParam, lParam) ;
}