2009.07.02 18:15 "[Tiff] Access violation in TiffOpen Function in "write" mode", by acanicio

Hello everybody,

I use LibTiffDelphi version 3.7.0.0 with LibTiff version 3.7.0.0

I have an issue using the TiffOpen Function. Whenever I try to open a Tiff

file in "w" (write) mode, I get an access violation.

I have traced the error through the following stack of calls:

1 - In my program:
OpenTiff is a pointer.

Filename is a string containing the value 'c:\dev\testtiff\test.tif';

Of course, the file does NOT exist. The directory does.

<<
OpenTiff :=TTiffOpen(PAnsichar(Filename),'w');
>>

2 - In LibTiffDelphi.pas line 1652 function TTiffOpen:

<< Result:=TIFFClientOpen(PChar(Name),PChar(Mode),fd,@TIFFFileReadProc,@TIFFFileWriteProc,@TIFFFileSeekProc,@TIFFFileCloseProc,@TIFFFileSizeProc,@TIFFNoMapProc,@TIFFNoUnmapProc);

>>

3 - In tif_open.c line 333, function TIFFClientOpen:
<<
if (!TIFFDefaultDirectory(tif))
goto bad;
>>

4 - In tif_dir.c, line 1198, function TIFFDefaultDirectory:

<<
(void) TIFFSetField(tif,TIFFTAG_COMPRESSION,COMPRESSION_NONE);
>>
5 - In tif_dir.c, line 708, function TIFFSetField:
<<
status = TIFFVSetFIeld(tif,tag,ap);
>>

6 - In tif_dir.c,line 177, function TIFFVSetFIeld:
<<
if(status = TIFSetCompressionScheme(tif,v) !=0)
>>

7 - In tif_compress.c function TIFSetCompressionScheme:

<<
int
TIFFSetCompressionScheme(TIFF* tif, int scheme)
{
const TIFFCodec *c = TIFFFindCODEC((uint16) scheme);
_TIFFSetDefaultCompressionState(tif);
/*

• Don't treat an unknown compression scheme as an error.
• This permits applications to open files with data that
• the library does not have builtin support for, but which
• may still be meaningful.

*/
return (c? (*c->init)(tif, scheme): 1);
}
>>

It crashes at the "return" clause, with the following error:

"Access violation at address B0B8005C. Read of address B0B8005C."

I don't have a C compiler so I cannot make changes to it or even test...

Thank you for any help.
Best regards
Axel

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