When is a EWin32Error exception raised?

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Question:

Answer:

As of release 3, Delphi has a SysUtils routine called Win32Check() which you can pass an API result to. If it is False, it will raise an EWin32Error exception which is given the descriptive message. If you don't like to raise an exception, you can use GetLastError() and pass the error code to SysErrorMessage() to get a descriptive string (it's actually the same string that the exception will have as a message).

Below is an example written in Delphi 7.

	begin // send a message to a non-existing window // unless you coincidentally happen to have // a window handle 321. In that case just run this twice :-) SendMessage(321, WM_CLOSE, 0, 0); // this will show the error message directly ShowMessage(SysErrorMessage(GetLastError)); // OR use your application's exception handling code RaiseLastOSError; // throws an exception // note: 'OR' means: only use one of the two. // Do not call GetLastError() twice.

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