Module32First returns ERROR_BAD_LENGTH

Question

Hi,

My application calls CreateToolhelp32Snapshot , Module32First and Module32Nextto to retrieve module information of current process.

Module32First always return ERROR_BAD_LENGTH even there is a loop to keep trying. Could anyone give me some help?

Thanks,

Frank

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Answer 1

Documentation:

The calling application must set the dwSize member of MODULEENTRY32 to the size, in bytes, of the structure.

ERROR_BAD_LENGTH is what you get if you don't do that, or if you pass a null pointer for the second parameter.