2006.08.04 15:56 "[Tiff] libtiff and MSVC 6 Update", by Sean Burke

Bernie, etc.,

Going off of a post in an unrelated subject, I compiled an executable that calls the dll library function. (See post on 2006.08.03 for source.) This code compiles without complaint:

#import "write2DTIFF.h"
int main(int argc, char *argv){
    printf("Calling write:\n");
    if((write2DTIFF()) == 1){
        printf("write2DTIFF failed.\n");
    }
    printf("write2DTIFF sucessful.\n");
    return 1;
}

When I compile it as an exe in VC6, the error given by the debugger is the same as was previously mentioned (Unhandled exception in testTW.exe (LIBTIFF3.DLL): 0xC0000005. Access Violation.). Since I am using VC6 and not 7, I assume that the "Enable Just-in-time debugging" is analogous to "When the exception is thrown: Break into the debugger" in VC7.

I recompiled the code with gcc/cygwin. When executed it throws an exception, but this one is a little more detailed:

Exception: STATUS_ACCESS_VIOLATION at eip=6FD8CF73
eax=00000000 ebx=00000004 ecx=009A1FA0 edx=009A1FA0 esi=00000090
edi=00000000
ebp=00000100 esp=0022ECD8 program=c:\Program Files\Microsoft Visual
Studio\MyProjects\write2DTIFF\Debug\write2DTIFF.exe, pid 5252, thread main
cs=001B ds=0023 es=0023 fs=003B gs=0000 ss=0023
Stack trace:
Frame Function Args
      6 [main] write2DTIFF 5252 _cygtls::handle_exceptions: Error while
dumping state (probably corrupted stack)

In both cases, my dll is linked to libtiff.lib - presumably the static library.

On the subject of TIFFOpen, it does appear that some default values are written if the program terminates before any other commands are called.

--
Sean Burke
Imaging Analysis Specialist
Albert Einstein College of Medicine
1300 Morris Park Avenue
Bronx, NY 10461
PH: 718.430.8628