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CU Amiga Super CD-ROM 15
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CU Amiga Magazine's Super CD-ROM 15 (1997)(EMAP Images)(GB)[!][issue 1997-10].iso
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Graphics
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Ghostscript
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dwmain.cpp
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1997-05-29
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/* Copyright (C) 1996, 1997, Russell Lang. All rights reserved.
This file is part of Aladdin Ghostscript.
Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
or distributor accepts any responsibility for the consequences of using it,
or for whether it serves any particular purpose or works at all, unless he
or she says so in writing. Refer to the Aladdin Ghostscript Free Public
License (the "License") for full details.
Every copy of Aladdin Ghostscript must include a copy of the License,
normally in a plain ASCII text file named PUBLIC. The License grants you
the right to copy, modify and redistribute Aladdin Ghostscript, but only
under certain conditions described in the License. Among other things, the
License requires that the copyright notice and this notice be preserved on
all copies.
*/
// dwmain.cpp
// Ghostscript DLL loader for Windows
#define STRICT
#include <windows.h>
#include <shellapi.h>
#ifndef __WIN32__
#include <toolhelp.h>
static BOOL dllfix(void);
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <dos.h>
extern "C" {
#include "gscdefs.h"
#define GSREVISION gs_revision
#include "gsdll.h"
}
#include "dwmain.h"
#include "dwdll.h"
#include "dwtext.h"
#include "dwimg.h"
#if defined(_MSC_VER) && defined(__WIN32__)
#define _export
#endif
/* public handles */
HINSTANCE ghInstance;
/* redirected stdio */
TextWindow tw;
const LPSTR szAppName = "Ghostscript";
#ifdef __WIN32__
const LPSTR szIniName = "GSWIN32.INI";
const char *szDllName = "GSDLL32.DLL";
#else
const LPSTR szIniName = "GSWIN.INI";
const char *szDllName = "GSDLL16.DLL";
#endif
const LPSTR szIniSection = "Text";
int dll_exit_status;
int FAR _export gsdll_callback(int message, char FAR *str, unsigned long count);
// the Ghostscript DLL class
gsdll_class gsdll;
char start_string[] = "systemdict /start get exec\n";
// program really starts at WinMain
int
new_main(int argc, char *argv[])
{
typedef char FAR * FARARGV_PTR;
FARARGV_PTR *far_argv;
int rc;
// load DLL
if (gsdll.load(ghInstance, szDllName, GSREVISION)) {
char buf[256];
gsdll.get_last_error(buf, sizeof(buf));
tw.puts(buf);
return 1;
}
#ifdef __WIN32__
far_argv = argv;
#else
far_argv = new FARARGV_PTR[argc+1];
if (!far_argv)
return 1;
for (int i = 0; i<argc; i++)
far_argv[i] = argv[i]; // convert from near to far pointers
far_argv[i+1] = NULL;
#endif
// initialize the interpreter
rc = gsdll.init(gsdll_callback, tw.get_handle(), argc, far_argv);
if (rc == GSDLL_INIT_QUIT) {
gsdll.unload();
return 0;
}
if (rc) {
char buf[256];
gsdll.get_last_error(buf, sizeof(buf));
tw.puts(buf);
gsdll.unload();
#ifndef __WIN32__
if (rc == GSDLL_INIT_IN_USE)
dllfix(); // offer option to unload NASTY!
#endif
return rc;
}
// if (!batch)
gsdll.execute(start_string, strlen(start_string));
#ifdef UNUSED
int len;
char line[256];
do {
len = tw.read_line(line, sizeof(line));
} while ( len && !gsdll.execute(line, len) );
#endif
gsdll.unload();
return 0;
}
/* our exit handler */
/* also called from Text Window WM_CLOSE */
void win_exit(void)
{
if (dll_exit_status) {
/* display message box so error messages in text window can be read */
char buf[80];
if (IsIconic(tw.get_handle()))
ShowWindow(tw.get_handle(), SW_SHOWNORMAL);
BringWindowToTop(tw.get_handle()); /* make text window visible */
sprintf(buf, "Exit code %d\nSee text window for details",dll_exit_status);
MessageBox((HWND)NULL, buf, szAppName, MB_OK | MB_ICONSTOP);
}
}
void
set_font(void)
{
int fontsize;
char fontname[256];
char buf[32];
// read ini file
GetPrivateProfileString(szIniSection, "FontName", "Courier New", fontname, sizeof(fontname), szIniName);
fontsize = GetPrivateProfileInt(szIniSection, "FontSize", 10, szIniName);
// set font
tw.font(fontname, fontsize);
// write ini file
WritePrivateProfileString(szIniSection, "FontName", fontname, szIniName);
sprintf(buf, "%d", fontsize);
WritePrivateProfileString(szIniSection, "FontSize", buf, szIniName);
}
int PASCAL
WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int cmdShow)
{
#if defined(_MSC_VER) /* MSC doesn't give us _argc and _argv[] so ... */
#define MAXCMDTOKENS 128
int _argc=0;
LPSTR _argv[MAXCMDTOKENS];
LPSTR p, q;
#ifdef __WIN32__
_argv[_argc] = "gswin32.exe";
#else
_argv[_argc] = "gswin.exe";
#endif
// Parse command line handling quotes.
p = lpszCmdLine;
while (*p) {
// for each argument
while ((*p) && (*p == ' '))
p++; // skip over leading spaces
if (*p == '\042') {
p++; // skip "
q = p;
// scan to end of argument
// doesn't handle embedded quotes
while ((*p) && (*p != '\042'))
p++;
_argv[++_argc] = q;
if (*p)
*p++ = '\0';
}
else if (*p) {
// delimited by spaces
q = p;
while ((*p) && (*p != ' '))
p++;
_argv[++_argc] = q;
if (*p)
*p++ = '\0';
}
}
_argv[++_argc] = (LPSTR)NULL;
#endif
if (hPrevInstance) {
MessageBox((HWND)NULL,"Can't run twice", szAppName, MB_ICONHAND | MB_OK);
return FALSE;
}
/* copy the hInstance into a variable so it can be used */
ghInstance = hInstance;
/* start up the text window */
if (!hPrevInstance) {
HICON hicon = LoadIcon(hInstance, (LPSTR)MAKEINTRESOURCE(GSTEXT_ICON));
tw.register_class(hInstance, hicon);
}
set_font();
tw.size(80, 80);
tw.drag("(", ") run\r");
// create the text window
if (tw.create(szAppName, cmdShow))
exit(1);
// initialize for image windows
ImageWindow::hwndtext = tw.get_handle();
ImageWindow::hInstance = hInstance;
dll_exit_status = new_main(_argc, _argv);
win_exit();
tw.destroy();
return dll_exit_status;
}
int FAR _export
gsdll_callback(int message, char FAR *str, unsigned long count)
{
char buf[256];
ImageWindow *iw;
switch (message) {
case GSDLL_POLL:
{
MSG msg;
while (PeekMessage(&msg, 0, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
// If text window closed then abort Ghostscript
if (!IsWindow(tw.get_handle()))
return -1;
break;
case GSDLL_STDIN:
return tw.read_line(str, count);
case GSDLL_STDOUT:
if (str != (char *)NULL)
tw.write_buf(str, count);
return count;
case GSDLL_DEVICE:
#ifdef DEBUG
sprintf(buf,"Callback: DEVICE %p %s\n", (char *)str,
count ? "open" : "close");
tw.puts(buf);
#endif
if (count) {
iw = new ImageWindow;
iw->open(str);
}
else {
iw = FindImageWindow(str);
iw->close();
}
break;
case GSDLL_SYNC:
#ifdef DEBUG
sprintf(buf,"Callback: SYNC %p\n", (char *)str);
tw.puts(buf);
#endif
iw = FindImageWindow(str);
iw->sync();
break;
case GSDLL_PAGE:
#ifdef DEBUG
sprintf(buf,"Callback: PAGE %p\n", (char *)str);
tw.puts(buf);
#endif
iw = FindImageWindow(str);
iw->page();
break;
case GSDLL_SIZE:
#ifdef DEBUG
sprintf(buf,"Callback: SIZE %p width=%d height=%d\n", (char *)str,
(int)(count & 0xffff), (int)((count>>16) & 0xffff) );
tw.puts(buf);
#endif
iw = FindImageWindow(str);
iw->size( (int)(count & 0xffff), (int)((count>>16) & 0xffff) );
break;
default:
sprintf(buf,"Callback: Unknown message=%d\n",message);
tw.puts(buf);
break;
}
return 0;
}
#ifndef __WIN32__
// This is a hack to cope with a GPF occuring in either Ghostscript
// or a driver loaded by Ghostscript. If a GPF occurs, gswin16.exe
// is unloaded, but not gsdll16.dll.
// Attempts to reload gswin16.exe will fail because gsdll16.dll
// is already in use. If this occurs, this code will unload
// gsdll16.dll, EVEN IF SOMEONE ELSE IS USING IT.
// The DLL module name as it appears in the module definition file
#define GSDLLNAME "GSDLL16"
// These are the names of EXE modules that are known users
// of the Ghostscript DLL.
// If one of these is running, it is not safe to unload the DLL.
#define GSEXE "GSWIN16"
typedef HMODULE (WINAPI *TOOLMFN)(MODULEENTRY FAR *, LPCSTR);
static BOOL
dllfix(void)
{
HMODULE hdll; // module handle of DLL
HMODULE hgswin16; // module handle of Ghostscript
MODULEENTRY me_dll; // to contain details about DLL module
MODULEENTRY me_gswin16; // details about Ghostscript
HINSTANCE htool; // module handle of TOOLHELP.DLL
TOOLMFN lpfnModuleFindName = NULL;
char buf[256];
BOOL err = FALSE;
// load TOOLHELP.DLL
htool = LoadLibrary("TOOLHELP.DLL");
if ( htool <= HINSTANCE_ERROR )
err = TRUE;
// get address of toolhelp function
if (!err) {
lpfnModuleFindName = (TOOLMFN)GetProcAddress(htool, "ModuleFindName");
err = !lpfnModuleFindName;
}
// find handle for DLL
if (!err) {
memset(&me_dll, 0, sizeof(me_dll));
me_dll.dwSize = sizeof(me_dll);
hdll = lpfnModuleFindName(&me_dll, GSDLLNAME);
}
// look for Ghostscript EXE module
// This should be found because we are it
if (!err) {
memset(&me_gswin16, 0, sizeof(me_gswin16));
me_gswin16.dwSize = sizeof(me_gswin16);
hgswin16 = lpfnModuleFindName(&me_gswin16, GSEXE);
}
#ifdef DEBUG
// for debugging, show what we have found
if (hdll) {
wsprintf(buf, "Found %s\nModule Handle=%d\nModule Usage=%d\nModule Path=%s",
me_dll.szModule, me_dll.hModule, me_dll.wcUsage, me_dll.szExePath);
MessageBox((HWND)NULL, buf, szAppName, MB_OK);
}
if (hgswin16) {
wsprintf(buf, "Found %s\nModule Handle=%d\nModule Usage=%d\nModule Path=%s",
me_gswin16.szModule, me_gswin16.hModule, me_gswin16.wcUsage,
me_gswin16.szExePath);
MessageBox((HWND)NULL, buf, szAppName, MB_OK);
}
#endif
// if DLL loaded and Ghostscript is not running...
if (!err &&
hdll && // Ghostscript DLL loaded
(hgswin16 && me_gswin16.wcUsage == 1) // Only one copy of Ghostscript EXE
) {
wsprintf(buf, "%s is loaded but does not appear to be in use by Ghostscript. Unload it?", GSDLLNAME);
if (MessageBox((HWND)NULL, buf, szAppName, MB_YESNO | MB_ICONHAND) == IDYES)
// If DLL is really in use, we about to cause a disaster
while (GetModuleUsage(hdll))
FreeLibrary(hdll);
}
if (htool)
FreeLibrary(htool);
return err;
}
#endif