_set_error_mode
Modifies __error_mode to determine a non-default location where the C runtime writes an error message for an error that might end the program.
Important
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This API cannot be used in applications that execute in the Windows Runtime. For more information, see CRT functions not supported with /ZW. |
int _set_error_mode( int modeval );
Controls the error output sink by setting the value of __error_mode. For example, you can direct output to a standard error or use the MessageBox API.
The modeval parameter can be set to one of the following values.
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Parameter |
Description |
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_OUT_TO_DEFAULT |
Error sink is determined by __app_type. |
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_OUT_TO_STDERR |
Error sink is a standard error. |
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_OUT_TO_MSGBOX |
Error sink is a message box. |
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_REPORT_ERRMODE |
Report the current __error_mode value. |
If a value other than those listed is passed in, the invalid parameter handler is invoked, as described in Parameter Validation. If execution is allowed to continue,_set_error_mode sets errno to EINVAL and returns -1.
When it's used with an assert, _set_error_mode displays the failed statement in the dialog box and gives you the option of choosing the Ignore button so that you can continue to run the program.
// crt_set_error_mode.c
// compile with: /c
#include <stdlib.h>
#include <assert.h>
int main()
{
_set_error_mode(_OUT_TO_STDERR);
assert(2+2==5);
}
Assertion failed: 2+2==5, file crt_set_error_mode.c, line 8 This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support team for more information.
