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#756 nsEcec: cannot handle exit code 259
nsExec never returns (or doesn't return before timeout occurred) if the called application returns with exit code 259 (ERROR_NO_MORE_ITEMS). nsExec checks lpExitCode != STILL_ACTIVE of the function GetExitCodeProcess in a loop which should be avoided (see MSDN: GetExitCodeProcess -> Warning: ...).
Use WaitForSingleObject instead to wait for the process handle returned by CreateProcess. The handle is signaled if the process finishes. Call GetExitCodeProcess if WaitForSingleObject returned successfully.
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Thanks, fixed.