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April 2002

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2002.04.08 22:49 "Trouble displaying TIFF image", by Randall Emery
2002.04.11 05:12 "Re: Trouble displaying TIFF image", by Jason Summers

2002.04.08 22:49 "Trouble displaying TIFF image", by Randall Emery

I have an existing program that loads and displays a bit map image, and I'm 
working in MS C++ to modify the program to use a TIFF image instead.

My basic approach has been to load in a TIFF image, translate it to a bit 
map format, and then let the program continue along as before.  I'm doing 
this translation using the LoadTIFFinDIB function, which is defined in 
\contrib\win95\tiff2dib.c of the libtiff 3.5.7 download for windows.

The original program reads in a bit map file with the following function call:
ghBkgrndBitMap = LoadResource(ghInst, FindResource(ghInst, 

I've included tiff2dib.c in my project file, defined a variable to hold the 
bit map with "HANDLE hDIB = NULL;", and replaced the call above with the 
following code:
hDIB = LoadTIFFinDIB("C:\\qtlogo.tif");  //original .bmp file saved as a 
.tif file
ghBkgrndBitMap = hDIB;

However, despite what appears to me to be a successful call to 
LoadTIFFinDIB (I get messages that tags 317 and "Thresholding" will be 
ignored, but hDIB points to a new area of memory), I get a black screen 
when the program displays the image.

If you have any insights into this problem, I'd really appreciate the 
help.  I'm brand new to the libtiff library.

Randall Emery

P.S. Definitions of the variables in the original function call follow:

HANDLE ghBkgrndBitMap = NULL;	/* bitmap we paint on the background of our 
client windows */

     HMODULE hModule,
     HRSRC hResInfo

typedef CHAR *LPSTR, *PSTR;
typedef unsigned long       DWORD;
typedef unsigned short      WORD;

#ifdef UNICODE
#endif // !UNICODE

#define IDB_BITMAP2                     113
#define RT_BITMAP           MAKEINTRESOURCE(2)