c++ - c2447错误学习创建Win32窗口

Question

我已经尝试了很多次，并从视频中复制了这段代码，但几乎有些不同，因为我无所事事，没有出现新的错误，但是我已经尝试了好几天了。和关闭。无论如何，c2447缺少{(旧样式格式？)在谷歌搜索后似乎很容易解决，但我被困住了并且感到沮丧。也应该是一个Win32窗口

#include <windows.h>

LRESULT CALLBACK
MainWindowCallback(HWND Window
UINT Message,
                              WPARAM WParam,
                              LPARAM LParam);
{
            LRESULT Result = 0;

            switch(Message)
            {
                case WM_SIZE:
                {
                OutputDebugStringA("WM_SIZE\n")
                } break;

                case WM_DESTROY:
                {
                OutputDebugStringA("WM_DESTROY\n")
                } break;

                case WM_ClOSE:
                {
                OutputDebugStringA("WM_CLOSE\n")
                } break;

                case WM_ACTIVATEAPP:
                {
                OutputDebugStringA("WM_ACTIVATEAPP\n")
                } break;

                default:
                {
                Result = ;
                } break;
            }
            return(Result);
}

int CALLBACK 
    WinMain(HINSTANCE Instance,
                HINSTANCE PrevInstance,
                LPSTR CommandLine,
                int ShowCode)



{
    WNDCLASS WindowClass = {};

WindowClass.style = CS_OWNDC|CS_HREDRAW|CS_VREDRAW;
WindowClass.lpfnWndProc = MainWindowCallback;
WindowClass.hInstance = Instance ;
  // WindowClass.hIcon;
WindowClass.lpszClassName = "RavelWindowClass";

    if(RegisterClass(&WindowClass));
{
    HWND WindowHandle =
        CreateWindowEx(0,
                                   WindowClass.lpszClassName,
                                    "Ravel",
                                    WS_OVERLAPPEDWINDOW|WS_VISIBLE,
                                    CW_USEDEFAULT,
                                    CW_USEDEFAULT,
                                    CW_USEDEFAULT,
                                    CW_USEDEFAULT,
                                    0,
                                    0,
                                    Instance,
                                    0);

                if(WindowHandle)
                {
                    for(;;)
                    {
                        MSG Message;
                        BOOL MessageResult = GetMessage(&Message, 0, 0, 0);
                        if(MessageResult > 0)
                        {
                            TranslateMessage(&Message);
                            DispatchMessage(&Message);

                        }
                        else
                        {
                            break;
                        }
                    }
                }
}

    return(0);
}

ps在我写这个网站的麻烦中并不那么草率。
谢谢

Answer 1

您的代码有几个错误。首先，编译器错误c2447告诉我们:

The compiler encountered an unexpected open brace at global scope. In most cases, this is caused by a badly-formed function header, a misplaced declaration, or a stray semi-colon. To resolve this issue, verify that the open brace follows a correctly-formed function header, and is not preceded by a declaration or a stray semi-colon.

因为分号结束了函数头，所以出现此错误，请注意，您还缺少两个第一个参数之间的 ,:

LRESULT CALLBACK
MainWindowCallback(HWND Window <-- missing comma        
                   UINT Message, 
                   WPARAM WParam, 
                   LPARAM LParam); <-- terminates the function header

请注意，c++区分大小写，因此 WM_ClOSE与您应使用的 WM_CLOSE不同。换句话说，您正在尝试使用未定义的常量，并且需要更改常量名称:

case WM_ClOSE: <-- this is an undefined constant, should be WM_CLOSE
{
  OutputDebugStringA("WM_CLOSE\n")
} break;