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August 2005
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2005.08.18 21:51 "win32 libtiff", by Mark R Olin
Hi, Anybody here use the win32 version of libtiff? I recently installed the win32 libraries/dlls precompiled BINARIES from Sourceforge Gnuwin32 project website and linked the library to my program to use the high level methods for reading tiffs. I am able to use the library routines successfully to read from tiffs and render the data ... in fact there is no tangible problem to report in the results. However, I did run the debugger anyway to check for access violations that were not caught at runtime. In my program, I declared: TIFF *tif ; Two breakpoints are set in the program called "tiffread.exe". #1 breakpoint is placed immediately before the line: tif = TIFFOpen( "..\\images\\barbara.tif", "r" ); At #1 the Debug Log gives an expected output: ----- Win32 Debug Session #01 -------- Program load @0x00400000 PID 0x000009C4 TID 0x00000D44 Loading ntdll.dll @0x7C900000 Loading KERNEL32.dll @0x7C800000 Loading USER32.dll @0x77D40000 Loading GDI32.dll @0x77F10000 Loading libtiff3.dll @0x6FD80000 Loading jpeg62.dll @0x686C0000 Loading msvcrt.dll @0x77C10000 Loading zlib1.dll @0x61B80000 #2 breakpoint immediately after TIFFOpen is called At #2 the Debug Log gives an unexpected output showing an Access Violation: ----- Win32 Debug Session #01 -------- Program load @0x00400000 PID 0x000009C4 TID 0x00000D44 Loading ntdll.dll @0x7C900000 Loading KERNEL32.dll @0x7C800000 Loading USER32.dll @0x77D40000 Loading GDI32.dll @0x77F10000 Loading libtiff3.dll @0x6FD80000 Loading jpeg62.dll @0x686C0000 Loading msvcrt.dll @0x77C10000 Loading zlib1.dll @0x61B80000 Access Violation at address 0x7C96CC82 The program pointer is pointing at "ntdll.dll" and a Debug message appears [Debug Messages] HEAP[tiffread.exe]: Invalid Address specified to RtlFreeHeap( 00140000, 0014A640 ) Although the program continues to run correctly with no more Access Violations, and I do get all the image data read out correctly, this concerns me that there may be a potential for a memory leak. Does anyone else have any ideas? Regards, Mark Olin