DDMM.CPP

/*========================================================================== 
 * 
 *  Copyright (c) 1995 - 1997  Microsoft Corporation.  All Rights Reserved. 
 * 
 *  File:       ddmm.cpp 
 *  Content:    Routines for using DirectDraw on a multimonitor system 
 * 
 ***************************************************************************/ 
 
#include <streams.h> 
#include <ddraw.h> 
#include "ddmm.h" 
 
/* 
 * FindDeviceCallback 
 */ 
typedef struct { 
LPSTR   szDevice; 
GUID*   lpGUID; 
GUID    GUID; 
BOOL    fFound; 
}   FindDeviceData; 
 
BOOL CALLBACK FindDeviceCallback(GUID* lpGUID, LPSTR szName, LPSTR szDevice, LPVOID lParam) 
{ 
FindDeviceData *p = (FindDeviceData*)lParam; 
 
if (lstrcmpiA(p->szDevice, szDevice) == 0) { 
    if (lpGUID) { 
p->GUID = *lpGUID; 
p->lpGUID = &p->GUID; 
    } else { 
p->lpGUID = NULL; 
    } 
    p->fFound = TRUE; 
    return FALSE; 
} 
return TRUE; 
} 
 
 
BOOL CALLBACK FindDeviceCallbackEx(GUID* lpGUID, LPSTR szName, LPSTR szDevice, LPVOID lParam, HANDLE hMonitor) 
{ 
FindDeviceData *p = (FindDeviceData*)lParam; 
 
if (lstrcmpiA(p->szDevice, szDevice) == 0) { 
    if (lpGUID) { 
p->GUID = *lpGUID; 
p->lpGUID = &p->GUID; 
    } else { 
p->lpGUID = NULL; 
    } 
    p->fFound = TRUE; 
    return FALSE; 
} 
return TRUE; 
} 
 
 
/* 
 * DirectDrawCreateFromDevice 
 * 
 * create a DirectDraw object for a particular device 
 */ 
IDirectDraw * DirectDrawCreateFromDevice(LPSTR szDevice, PDRAWCREATE DirectDrawCreateP, PDRAWENUM DirectDrawEnumerateP) 
{ 
IDirectDraw*    pdd = NULL; 
FindDeviceData  find; 
 
if (szDevice == NULL) { 
DirectDrawCreateP(NULL, &pdd, NULL); 
return pdd; 
} 
 
find.szDevice = szDevice; 
find.fFound   = FALSE; 
DirectDrawEnumerateP(FindDeviceCallback, (LPVOID)&find); 
 
if (find.fFound) 
{ 
// 
// In 4bpp mode the following DDraw call causes a message box to be popped 
// up by DDraw (!?!).  It's DDraw's fault, but we don't like it.  So we 
// make sure it doesn't happen. 
// 
UINT ErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS); 
DirectDrawCreateP(find.lpGUID, &pdd, NULL); 
SetErrorMode(ErrorMode); 
} 
 
return pdd; 
} 
 
 
/* 
 * DirectDrawCreateFromDeviceEx 
 * 
 * create a DirectDraw object for a particular device 
 */ 
IDirectDraw * DirectDrawCreateFromDeviceEx(LPSTR szDevice, PDRAWCREATE DirectDrawCreateP, LPDIRECTDRAWENUMERATEEXA DirectDrawEnumerateExP) 
{ 
IDirectDraw*    pdd = NULL; 
FindDeviceData  find; 
 
if (szDevice == NULL) { 
DirectDrawCreateP(NULL, &pdd, NULL); 
return pdd; 
} 
 
find.szDevice = szDevice; 
find.fFound   = FALSE; 
DirectDrawEnumerateExP(FindDeviceCallbackEx, (LPVOID)&find, 
DDENUM_ATTACHEDSECONDARYDEVICES); 
 
if (find.fFound) 
{ 
// 
// In 4bpp mode the following DDraw call causes a message box to be popped 
// up by DDraw (!?!).  It's DDraw's fault, but we don't like it.  So we 
// make sure it doesn't happen. 
// 
UINT ErrorMode = SetErrorMode(SEM_FAILCRITICALERRORS); 
DirectDrawCreateP(find.lpGUID, &pdd, NULL); 
SetErrorMode(ErrorMode); 
} 
 
return pdd; 
}