103 lines
3.5 KiB
C
103 lines
3.5 KiB
C
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/*
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* Dynamically link to DCI entry points.
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* To implement dynamic linking
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* 1. include this file in DRAWDIB.C
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* 2. include a call in DRAWDIB.C to InitialiseDCI()
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* 3. include a call in DRAWDIB.C to TerminateDCI()
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* at the appropriate points.
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* There are no other changes.
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* To revert to static linking you can simply modify this file or
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* #define STATIC_LINK_TO_DCI during the compilation phase.
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* AND link to DCIMAN32.LIB
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*
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* IF the code adds calls to other DCI entry points they will have to be
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* added to this file. You should find that out easily enough as there will
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* be an unresolved reference on linking (assuming that DCIMAN32.LIB is not
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* included in the libraries list).
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*
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* The process is straightforward.
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* string variables are defined to hold the
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* names of the DCI function entry points.
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* function variables are defined for each entry point being indirected
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* the code is added to GetProcAddress for each entry
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* a #define is added to point the DCI entry point name at the function variable
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*/
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#ifdef STATIC_LINK_TO_DCI
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#define InitialiseDCI() 1
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#define TerminateDCI()
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#else
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static const char DCILIBRARY[] = "DCIMAN32.DLL";
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static HINSTANCE hlibDCI;
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static BOOL fDCILinked;
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static UINT cDCIUsers; // Count of active DCI users
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char szDCIOpenProvider[] = "DCIOpenProvider";
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char szDCICloseProvider[] = "DCICloseProvider";
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char szDCICreatePrimary[] = "DCICreatePrimary";
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char szDCIEndAccess[] = "DCIEndAccess";
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char szDCIBeginAccess[] = "DCIBeginAccess";
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char szDCIDestroy[] = "DCIDestroy";
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HDC (WINAPI *pfnDCIOpenProvider)(void);
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void (WINAPI *pfnDCICloseProvider)(HDC hdc);
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int (WINAPI *pfnDCICreatePrimary)(HDC hdc, LPDCISURFACEINFO FAR *lplpSurface);
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void (WINAPI *pfnDCIEndAccess)(LPDCISURFACEINFO pdci);
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DCIRVAL (WINAPI *pfnDCIBeginAccess)(LPDCISURFACEINFO pdci, int x, int y, int dx, int dy);
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void (WINAPI *pfnDCIDestroy)(LPDCISURFACEINFO pdci);
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BOOL InitialiseDCI(void);
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__inline BOOL InitialiseDCI()
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{
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++cDCIUsers;
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if (fDCILinked) {
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// Already linked
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return(TRUE);
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}
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hlibDCI = LoadLibraryA(DCILIBRARY);
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if (hlibDCI) {
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(FARPROC)pfnDCIOpenProvider = GetProcAddress(hlibDCI, szDCIOpenProvider);
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(FARPROC)pfnDCICloseProvider = GetProcAddress(hlibDCI, szDCICloseProvider);
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(FARPROC)pfnDCICreatePrimary = GetProcAddress(hlibDCI, szDCICreatePrimary);
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(FARPROC)pfnDCIEndAccess = GetProcAddress(hlibDCI, szDCIEndAccess);
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(FARPROC)pfnDCIBeginAccess = GetProcAddress(hlibDCI, szDCIBeginAccess);
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(FARPROC)pfnDCIDestroy = GetProcAddress(hlibDCI, szDCIDestroy);
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if (pfnDCIOpenProvider &&
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pfnDCICloseProvider &&
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pfnDCICreatePrimary &&
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pfnDCIEndAccess &&
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pfnDCIBeginAccess &&
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pfnDCIDestroy) {
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fDCILinked = TRUE;
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} else {
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--cDCIUsers;
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FreeLibrary(hlibDCI);
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hlibDCI = NULL;
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}
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}
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return fDCILinked;
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}
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#define TerminateDCI() \
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if (hlibDCI && !--cDCIUsers) {\
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FreeLibrary(hlibDCI); \
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fDCILinked = FALSE; \
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hlibDCI = NULL; \
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}
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// Map the static names to the function pointers.
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#define DCIOpenProvider pfnDCIOpenProvider
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#define DCICloseProvider pfnDCICloseProvider
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#define DCICreatePrimary pfnDCICreatePrimary
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#define DCIEndAccess pfnDCIEndAccess
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#define DCIBeginAccess pfnDCIBeginAccess
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#define DCIDestroy pfnDCIDestroy
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#endif
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