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Debugging ISAPI DLLs

Title: Debugging ISAPI DLLs Question: It's hard to debug a ISAPI DLL. Here is a simple solution to display message boxes. Answer: IIS is a service, so normally you can't interact with the desktop. A solution is to use MessageBox API with MP_TOPMOST and MB_SERVICE_NOTIFICATION: procedure DbgMsg(aStr: string); begin MessageBox(0,PChar(aStr), 'ISAPI Debug-Message', MB_OK + MB_TOPMOST + MB_SERVICE_NOTIFICATION); end; Note that the Delphi IDE also offers some DLL-Options in the Project-Options Dialog [Linker] !!