I am a programmer familiar with C# & Java and new to C . I am trying to create an editor in C# WPF for my C OpenGL application and I am following these tutorials: Creating OpenGL Windows in WPF and Walkthrough: Host a Win32 Control in WPF. The latter is from Microsoft.

This line of code Helper::ErrorExit(L"RegisterWindowClass"); gives me this error: Argument of type "const wchar_t*" is incompatible with parameter of type "LPTSTR". It is the L that is triggering this according to Visual Studio and I don't exactly know how to fix it.

public:
        //
        // Taken from MSDN
        //
        static void ErrorExit(LPTSTR lpszFunction)
        {
            // Retrieve the system error message for the last-error code
            LPVOID lpMsgBuf;
            LPVOID lpDisplayBuf;
            DWORD dw = GetLastError();

            FormatMessage(
                FORMAT_MESSAGE_ALLOCATE_BUFFER |
                FORMAT_MESSAGE_FROM_SYSTEM |
                FORMAT_MESSAGE_IGNORE_INSERTS,
                NULL,
                dw,
                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                (LPTSTR)&lpMsgBuf,
                0, NULL);

            // Display the error message and exit the process

            lpDisplayBuf = (LPVOID)LocalAlloc(LMEM_ZEROINIT,
                (lstrlen((LPCTSTR)lpMsgBuf)   lstrlen((LPCTSTR)lpszFunction)   40) * sizeof(TCHAR));

            StringCchPrintf((LPTSTR)lpDisplayBuf,
                LocalSize(lpDisplayBuf) / sizeof(TCHAR),
                TEXT("%s failed with error %d: %s"),
                lpszFunction, dw, lpMsgBuf);
            ::MessageBox(NULL, (LPCTSTR)lpDisplayBuf, TEXT("Error"), MB_OK);

            LocalFree(lpMsgBuf);
            LocalFree(lpDisplayBuf);
            ExitProcess(dw);
        }

CodePudding user response：

TEXT("RegisterWindowClass") is supposed to be used.

Avoid using L"RegisterWindowClass" or "RegisterWindowClass" with parameters of type LPTSTR.

Also change the parameter type to LPCTSTR in static void ErrorExit(LPCTSTR lpszFunction).