How to debug a Visual Basic DLL under Active Server Pages

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To debug a Visual Basic component that is running under Active Server Pages and IIS, you must use a debugger that uses the CodeView style of debug information. The steps in this article use Microsoft Developer Studio. Developer Studio is the application used to develop Visual C++ and Visual J++ applications.

1. In the project options for your Visual Basic DLL, select Create Symbolic Debug Info. This option generates symbolic debug information in an executable file or in a .dll file. You should also select no optimization.
2. Run IIS (INetInfo.exe) under the debugger. Doing this is covered in Tech Note 063, which is part of the C++ documentation. To locate this article, search in Developer Studio or Microsoft Developer Network by using the key words "TN063: Debugging Internet Extension DLLs." For more information, see the "References" section.
   
   Here is a summary of the steps that are required:
   1. Make sure your user account has the required user rights to run inetinfo. See Tech Note 063 - Debugging Tips for a detailed explanation.
   2. Select Open Workspace, and then open INetInfo.exe.
   3. Under the debug settings for the workspace, enter -e W3Svc as a program argument.
   4. Under additional DLLs, select your Visual Basic DLL.
3. In a test DLL, export the GetInfo method. This method is in the InfoObj.cls file. To debug the GetInfo method, load the InfoObj.cls file into Developer Studio, and then set a breakpoint in the method. Browse a page that loads the DLL and calls the method. Developer Studio will stop at the breakpoint in this function.