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Message: [QUOTE="Chris Torek, post: 2479287"] I think your guess is wrong :-) I think this is not the problem. (I believe that TIFFGetField does its own malloc() and sets *vpp to the result.) Depending on which version of libtiff one has, the "count" provided via &count here must be a "uint32". Probably the code is writing 32 bits' worth of data into a 16-bit container, and clobbering some unrelated variable in the process. Perhaps equally importantly, in the original code, "Beginner" went on to use strcat() with inappropriate parameters. In particular, the target buffer for strcat() is not necessarily initially empty, and the source values are not necessarily strings (and certainly have not had their data-types converted correctly). (While the "count" filled in is a count of 4-byte values, it is not really clear what those values are, given the documentation.) [/QUOTE]