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Can't load_bitmap after GetOpenFileName
Wilson Saunders
Member #5,872
May 2005
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Posted on 05/04/2007 6:24 PM   View Profile

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?

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Play my games at http://monkeydev.com

23yrold3yrold
Member #1,134
March 2001
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Posted on 05/04/2007 6:45 PM   View Profile
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. :P

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 ....

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Software Development == Church Development
Step 1. Build it.
Step 2. Pray.

Wilson Saunders
Member #5,872
May 2005
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Posted on 05/04/2007 6:56 PM   View Profile

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){
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}

________________________________________________
Play my games at http://monkeydev.com

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