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I wanted to call _popen to get the results from an executable but it was blanking out.
I looked in debugger and found out the program uses Kernel32.WriteConsoleW to write a unicode string to the console, instead of using stdout.
How do I capture it?
You should be able to redirect the Output of a child process.
Have a look at Creating a Child Process with Redirected Input and Output
Furthermore the application might use STD_ERROR_HANDLE instead of STD_OUTPUT_HANDLE.