Can't load_bitmap after GetOpenFileName

no-reply@allegro.cc (Wilson Saunders) — Sat, 05 May 2007 04:24:12 +0000

I am using winalleg.h's GetOpenFileName() to retrieve the path to a file. I have it working such that I get a path form GetOpenFileName(). However the next time I call load_bitmap() I get NULL returned instead of the bitmap pointer.

All my previous calls to load_bitmap() return the a bitmap pointer. Also the load_bitmap call that fails is hardcoded with the file name. The load_bitmap call works if GetOpenFileName() was not called previously. Oddly it also works if GetOpenFileName() was called but was canceled instead of successfully retrieving a file name.

My best guess is that something in the GetOpenFileName() is setting some sort of windows flag that forbids allegro's load_bitmap() from functioning properly.

Has this happened to any of you? How can I fix this?

no-reply@allegro.cc (23yrold3yrold) — Sat, 05 May 2007 04:45:22 +0000

Quote:

My best guess is that something in the GetOpenFileName() is setting some sort of windows flag that forbids allegro's load_bitmap() from functioning properly.

Or setting a flag that messes with the retrival of the filename data itself. The OPENFILENAME structure is .... not small.

Quote:

Has this happened to any of you?

Only when using Win32 straight up. Sadly, I forget the solutions I came up with, and I don't know how they might work with Allegro ....

no-reply@allegro.cc (Wilson Saunders) — Sat, 05 May 2007 04:56:32 +0000

Here is the problem code, in case any of you can spot what I am doing wrong. I have added the load_bitmap right after the GetOpenFileName to remove the chance something else is messing up the load_bitmap call. Normally the load_bitmap call happens else where.

1char * WinLoader::getLoadPath(char * path, char * filter){
PALETTE pal; 
BITMAP * tempBMP;
OPENFILENAME ofn;
char myPath[260];
char szFile[260]="";
get_palette(pal);
memset(&ofn,0,sizeof(ofn));
  // set path to current program directory
_getdcwd(0,myPath,260);  //program path;
strncat(myPath, "\\",5);
strncat(myPath, path,102);
  
  //set important ofn values
ofn.lStructSize =  sizeof(OPENFILENAME);
ofn.hwndOwner  =  win_get_window();
ofn.nMaxFile = sizeof(szFile);
ofn.lpstrFile = szFile;  
ofn.lpstrFilter = filter;
ofn.lpstrInitialDir = myPath;
ofn.Flags = OFN_HIDEREADONLY & OFN_FILEMUSTEXIST ;
22 
if(GetOpenFileName(&ofn) == false){
}
  /***************************************************
   * The Error occures here. If the user selects Cancel
   * in the Open file dialog box tempBMP will get a 
   * bitmap pointer. If the user selects a valid file
   * tempBMP will get NULL.
   **************************************************/
tempBMP = load_bitmap("Data//BackDrops//INST_DN.bmp", pal);
  // copy save path to a more permanent string
strncpy(fileName, szFile, 206);
return fileName;
35}

1	char * WinLoader::getLoadPath(char * path, char * filter){
2	PALETTE pal;
3	BITMAP * tempBMP;
4	OPENFILENAME ofn;
5	char myPath[260];
6	char szFile[260]="";
7	get_palette(pal);
8	memset(&ofn,0,sizeof(ofn));
9	// set path to current program directory
10	_getdcwd(0,myPath,260); //program path;
11	strncat(myPath, "\\",5);
12	strncat(myPath, path,102);
13
14	//set important ofn values
15	ofn.lStructSize = sizeof(OPENFILENAME);
16	ofn.hwndOwner = win_get_window();
17	ofn.nMaxFile = sizeof(szFile);
18	ofn.lpstrFile = szFile;
19	ofn.lpstrFilter = filter;
20	ofn.lpstrInitialDir = myPath;
21	ofn.Flags = OFN_HIDEREADONLY & OFN_FILEMUSTEXIST ;
22
23	if(GetOpenFileName(&ofn) == false){
24	}
25	/***************************************************
26	* The Error occures here. If the user selects Cancel
27	* in the Open file dialog box tempBMP will get a
28	* bitmap pointer. If the user selects a valid file
29	* tempBMP will get NULL.
30	**************************************************/
31	tempBMP = load_bitmap("Data//BackDrops//INST_DN.bmp", pal);
32	// copy save path to a more permanent string
33	strncpy(fileName, szFile, 206);
34	return fileName;
35	}