You did not show the creation of StringBuilder Buff it should have a preallocated size ("capacity") equal to (or exceeding) whatever value nChars has.
You did not show the code that assigns some value to IntPtr handle chances are that is where the problem is.
If you are going to call Marshal.GetLastWin32Error, the function whose error you're retrieving had better have SetLastError=true - The Old New Thing However GetLastWin32Error with the attribute clearly is best.įor more info, see e.g. Using GetLastError (which often gives the right error code) is better than using GetLastWin32Error on a Win32 that was declared without the attribute (as that always returns wrong error codes). Since you didn't use the attribute, the error code returned does not belong to your Win32 call. The DllImport attribute SetLastError=true. The latter returns the error code from the most recent Win32 call that had when another thread intervenes and somehow calls Win32). The former returns the latest Win32 error, but that might be associated to something other than your explicit Win32 p/invoke operation (e.g. Please add some Sample Code: DllImport('user32.dll') return: MarshalAs(UnmanagedType. There are two functions that provide error information: GetLastError and GetLastWin32Error. NET CF you may need to replace user32.dll with coredll.dll.
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