RAD Studio VCL Reference
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System.NoErrMsg Variable
System | Description
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Controls whether the application displays an error message when a runtime error occurs.

Pascal
NoErrMsg: Boolean platform = False;
C++
Boolean platform NoErrMsg = False;
File
Description

Note: On Windows, set NoErrMsg to control whether a message appears to indicate that a runtime error has occurred. When NoErrMsg is false (the default), runtime errors cause the application to display a message box indicating the type of error that occurred. When NoErrMsg is true, these messages are suppressed.
On Linux, NoErrMsg only no effect.
Note: The SysUtils unit turns most runtime errors into exceptions. If your application includes SysUtils, the runtime error message box is unlikely to appear, even if NoErrMsg is false.
 

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