How can I supress all error dialogs when a process crashes (I only want it to crash silently)
c++, exception, winapi
Solution
You want to suppress two things:
- OS modal dialog notifying user on crash
- Your own dialogs popped up by runtime
The first you do with `SetErrorMode` requesting `SEM_FAILCRITICALERRORS` and `SEM_NOGPFAULTERRORBOX`. The second can be suppressed by altering CRT behavior with `_set_abort_behavior`.
You don't actually need an empty handler with `SetUnhandledExceptionFilter` - you are not doing anything important there. Proving no handler would crash the process and `SetErrorMode` (see above) will suppress the unwanted OS notification.
Sample code to do it:
SetErrorMode(SEM_FAILCRITICALERRORS | SEM_NOGPFAULTERRORBOX);
_set_abort_behavior(0,_WRITE_ABORT_MSG);
Problem
I have a process which I start with CreateProcess, then I wait for it to finish and check its exit code. I do this in batch mode and I don't want any message boxes to show up if the process crashes. It's enough to just return a nonzero exit code which would indicate failure. So far I've tried using ``` LONG WINAPI MyUnhandledExceptionFilter(_EXCEPTION_POINTERS *lpTopLevelExceptionFilter) { ExitProcess(-1); return EXCEPTION_EXECUTE_HANDLER; } BOOL CMyApp::InitInstance() { AfxEnableControlContainer(); SetUnhandledExceptionFilter(MyUnhandledExceptionFilter); throw std::runtime_error("test"); } ``` But this isn't always silent. Sometimes it displays a dialog: ``` --------------------------- Microsoft Visual C++ Runtime Library --------------------------- Runtime Error! Program: C:\Workspace\MyApp\Release\MyApp.exe abnormal program termination --------------------------- OK --------------------------- ```