MiniDumpWriteDump (C#) produces zero length dump files for specific process

Question

1. Executing MiniDumpWriteDump within the specific process provides healthy dump file.

2. Executing MiniDumpWriteDump from external process, where hProcess an

Answer 1

Ok.. found the solution for that..

The external process project was build for "AnyCPU" platform (and as it doesn't execute only-64 bit commands, it was running for 32-bit). Setting it to x64 made it possible to dump another 64 bit process.

And I would recommend to anyone who encounter this issue, to create separated projects, one for 32 bit and one for 64 bit.