How to use win32 CreateProcess function to wait until the child done to write to file?

A slight modification of Benoits answer. You can create an event in the parent process and wait for that event with WaitForSingleObject . This event can then be signaled by the child through a call to SetEvent .

The PROCESS_INFORMATION structure (which is the last argument to CreateProcess) contains member hProcess. This is a handle to the new process, which you can wait on using WaitForSingleObject.

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