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.NET Forum / .NET Framework / Interop / July 2003GetLastError with It Just Works
I am using It Just Works to call many Win32APIs from managed C++. I have seen in one book that with PInvoke that you should NOT call GetLastError via PInvoke but that you should call Marshal::GetLastWin32Error. What am I supposed to do when I am using the IJW interop interface? Thanks ------------------------------------------- Roy Chastain KMSystems, Inc. The problem is, the interop code itself may call some API which sets the last error code. With PInvoke, we can set the SetLastError field of the DllImport attribute to true, and call Marshal::GetLastWin32Error to retrieve the error value cached by the interop layer. There's no such mechanism in IJW, so I'm afraid you need to fall back to PInvoke if you want to call GetLastError for that API call. Hope this helps. Regards, Xin This posting is provided "AS IS" with no warranties, and confers no rights. You assume all risk for your use. (c) 2003 Microsoft Corporation. All rights reserved. Does this fact make IJW a little useless for a large majority of API calls? >The problem is, the interop code itself may call some API which sets the >last error code. [quoted text clipped - 14 lines] >You assume all risk for your use. (c) 2003 Microsoft Corporation. All >rights reserved. ------------------------------------------- Roy Chastain KMSystems, Inc. Yes, in cases if you want to get the last error value. Regards, Xin This posting is provided "AS IS" with no warranties, and confers no rights. Microsoft Security Announcement: Have you installed the patch for Microsoft Security Bulletin MS03-026? If not Microsoft strongly advises you to review the information at the following link regarding Microsoft Security Bulletin MS03-026 http://www.microsoft.com/security/security_bulletins/ms03-026.asp and/or to visit Windows Update at http://windowsupdate.microsoft.com to install the patch. Running the SCAN program from the Windows Update site will help to insure you are current with all security patches, not just MS03-026. Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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