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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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dwdll.cpp
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C/C++ Source or Header
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1996-07-03
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9KB
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344 lines
/* Copyright (C) 1996, 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.
*/
// dwdll.cpp
// gsdll class for MS-Windows
#define STRICT
#include <windows.h>
#include <string.h>
#include <stdio.h>
extern "C" {
#include "gsdll.h"
}
#include "dwdll.h" // gsdll_class
static char not_loaded[] = "DLL is not loaded";
static char func_null[] = "A function pointer to the DLL is NULL";
static char not_init[] = "Not initialized";
int
gsdll_class::load(const HINSTANCE in_hinstance,
const char *name, const long need_version)
{
char fullname[1024];
const char *shortname;
char *p;
long version;
// Don't load if already loaded
if (hmodule)
return 0;
hinstance = in_hinstance;
initialized = FALSE;
// Try to load DLL first with given path
hmodule = LoadLibrary(name);
if (hmodule < (HINSTANCE)HINSTANCE_ERROR) {
// failed
// try again, with path of EXE
if ((shortname = strrchr((char *)name, '\\')) == (const char *)NULL)
shortname = name;
GetModuleFileName(hinstance, fullname, sizeof(fullname));
if ((p = strrchr(fullname,'\\')) != (char *)NULL)
p++;
else
p = fullname;
*p = '\0';
strcat(fullname, shortname);
hmodule = LoadLibrary(fullname);
if (hmodule < (HINSTANCE)HINSTANCE_ERROR) {
// failed again
// try once more, this time on system search path
hmodule = LoadLibrary(shortname);
if (hmodule < (HINSTANCE)HINSTANCE_ERROR) {
sprintf(last_error, "Couldn't load DLL, LoadLibrary error code %d", (int)hmodule);
hmodule = (HINSTANCE)0;
return 1;
}
}
}
// DLL is now loaded
// Get pointers to functions
c_revision = (PFN_gsdll_revision) GetProcAddress(hmodule, "gsdll_revision");
if (c_revision == NULL) {
sprintf(last_error, "Can't find gsdll_revision\n");
unload();
return 1;
}
// check DLL version
c_revision(NULL, NULL, &version, NULL);
if (version != need_version) {
sprintf(last_error, "Wrong version of DLL found.\n Found version %ld\n Need version %ld\n", version, need_version);
unload();
return 1;
}
// continue loading other functions */
c_init = (PFN_gsdll_init) GetProcAddress(hmodule, "gsdll_init");
if (c_init == NULL) {
sprintf(last_error, "Can't find gsdll_init\n");
unload();
return 1;
}
c_execute_begin = (PFN_gsdll_execute_begin) GetProcAddress(hmodule, "gsdll_execute_begin");
if (c_execute_begin == NULL) {
sprintf(last_error, "Can't find gsdll_execute_begin\n");
unload();
return 1;
}
c_execute_cont = (PFN_gsdll_execute_cont) GetProcAddress(hmodule, "gsdll_execute_cont");
if (c_execute_cont == NULL) {
sprintf(last_error, "Can't find gsdll_execute_cont\n");
unload();
return 1;
}
c_execute_end = (PFN_gsdll_execute_end) GetProcAddress(hmodule, "gsdll_execute_end");
if (c_execute_end == NULL) {
sprintf(last_error, "Can't find gsdll_execute_end\n");
unload();
return 1;
}
c_exit = (PFN_gsdll_exit) GetProcAddress(hmodule, "gsdll_exit");
if (c_exit == NULL) {
sprintf(last_error, "Can't find gsdll_exit\n");
unload();
return 1;
}
c_lock_device = (PFN_gsdll_lock_device) GetProcAddress(hmodule, "gsdll_lock_device");
if (c_lock_device == NULL) {
sprintf(last_error, "Can't find gsdll_lock_device\n");
unload();
return 1;
}
c_copy_dib = (PFN_gsdll_copy_dib) GetProcAddress(hmodule, "gsdll_copy_dib");
if (c_copy_dib == NULL) {
sprintf(last_error, "Can't find gsdll_copy_dib\n");
unload();
return 1;
}
c_copy_palette = (PFN_gsdll_copy_palette) GetProcAddress(hmodule, "gsdll_copy_palette");
if (c_copy_palette == NULL) {
sprintf(last_error, "Can't find gsdll_copy_palette\n");
unload();
return 1;
}
c_draw = (PFN_gsdll_draw) GetProcAddress(hmodule, "gsdll_draw");
if (c_draw == NULL) {
sprintf(last_error, "Can't find gsdll_draw\n");
unload();
return 1;
}
return 0;
}
int
gsdll_class::unload(void)
{
// exit Ghostscript interpreter
if (initialized) {
if (!execute_code)
c_execute_end();
c_exit();
#ifndef __WIN32__
FreeProcInstance((FARPROC)callback);
#endif
callback = NULL;
}
// Set functions to NULL to prevent use
c_revision = NULL;
c_init = NULL;
c_execute_begin = NULL;
c_execute_cont = NULL;
c_execute_end = NULL;
c_exit = NULL;
c_lock_device = NULL;
c_copy_dib = NULL;
c_copy_palette = NULL;
c_draw = NULL;
// need to do more than this
device = NULL;
// Don't do anything else if already unloaded
if (hmodule == (HINSTANCE)NULL)
return 0;
FreeLibrary(hmodule);
return 0;
}
int
gsdll_class::revision(char FAR * FAR *product, char FAR * FAR *copyright,
long FAR *revision, long FAR *revisiondate)
{
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (!c_revision)
return c_revision(product, copyright, revision, revisiondate);
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::init(GSDLL_CALLBACK in_callback, HWND hwnd, int argc, char FAR * FAR *argv)
{
int rc;
execute_code = 0;
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (initialized) {
strcpy(last_error, "Already initialized");
return 1;
}
if (in_callback == (GSDLL_CALLBACK)NULL) {
strcpy(last_error, "Callback not provided");
return 1;
}
#ifdef __WIN32__
callback = in_callback;
#else
callback = (GSDLL_CALLBACK)MakeProcInstance((FARPROC)in_callback, hinstance);
#endif
if (c_init && c_execute_begin) {
rc = c_init(callback, hwnd, argc, argv);
if (rc) {
if (rc == GSDLL_INIT_IN_USE)
sprintf(last_error, "gsdll_init returns %d\nDLL already in use", rc);
else
sprintf(last_error, "gsdll_init returns %d\n", rc);
return rc;
}
else {
if ((rc = c_execute_begin()) != 0)
sprintf(last_error, "gsdll_execute_begin returns %d", rc);
else
initialized = TRUE;
return rc;
}
}
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::restart(int argc, char FAR * FAR *argv)
{
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (!initialized) {
strcpy(last_error, not_init);
return 1;
}
if (c_execute_end && c_exit) {
if (!execute_code)
c_execute_end();
c_exit();
#ifndef __WIN32__
FreeProcInstance((FARPROC)callback);
#endif
// ignore return codes since they we may be aborting from an error
initialized = FALSE;
return init(callback, hwnd, argc, argv);
}
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::get_last_error(char *str, int len)
{
strncpy(str, last_error,
(len < sizeof(last_error) ? len : sizeof(last_error)));
return 0;
}
int
gsdll_class::execute(const char FAR *str, int len)
{
if (!hmodule) {
strcpy(last_error, not_loaded);
return 1;
}
if (!initialized) {
strcpy(last_error, not_init);
return 1;
}
if (c_execute_cont) {
execute_code = c_execute_cont(str, len);
return execute_code;
}
strcpy(last_error, func_null);
return 1;
}
int
gsdll_class::draw(const char FAR *device, HDC hdc, int dx, int dy, int wx, int wy, int sx, int sy)
{
RECT source, dest;
source.left = sx;
source.right = sx+wx;
source.top = sy;
source.bottom = sy+wy;
dest.left = dx;
dest.right = dx+wx;
dest.top = dy;
dest.bottom = dy+wy;
c_draw((unsigned char FAR *)device, hdc, &dest, &source);
return 0;
}
HPALETTE
gsdll_class::copy_palette(const char FAR *device)
{
return c_copy_palette((unsigned char FAR *)device);
}
HGLOBAL
gsdll_class::copy_dib(const char FAR *device)
{
return c_copy_dib((unsigned char FAR *)device);
}
int
gsdll_class::lock_device(const char FAR *device, int lock)
{
return c_lock_device((unsigned char FAR *)device, lock);
}