本来想用MFC写一个主窗口一个子窗口，结果一直在报错，别人的程序就能运行，不知道为什么

Question

这个是人家的，可以运行：

#include <afxwin.h>

HINSTANCE g_hInstance = 0;
//窗口处理函数  
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg)
    {
    case WM_DESTROY:
        PostQuitMessage(0);//可以使GetMessage返回0  
        break;
    case  WM_CREATE:
    {
        CREATESTRUCT crt = *((CREATESTRUCT*)lParam);
        char buf[256] = { 0 };
        sprintf(buf, "创建的窗口类名称是%s，窗口名称是%s", crt.lpszClass, crt.lpszName);
        MessageBox(NULL, buf, "消息处理", MB_OK);
    }
    case WM_QUIT:
    {
        int param = (int)wParam;
        char buf[256];
        sprintf(buf, "进程退出，退出码:%d", param);
        MessageBox(NULL, buf, "消息处理", MB_OK);
    }
    case WM_SYSCOMMAND:
    {
        if (wParam == SC_MAXIMIZE)
        {
            short x = LOWORD(lParam);
            short y = HIWORD(lParam);
            char buf[256];
            sprintf(buf, "窗口最大化，x坐标:%d，y坐标:%d", x, y);
            MessageBox(NULL, buf, "消息处理", MB_OK);
        }
    }
    case WM_SIZE:
    {
        if (wParam == SIZE_MAXIMIZED)
        {
            short width = LOWORD(lParam);
            short hight = HIWORD(lParam);
            char buf[256];
            sprintf(buf, "窗口最大化，高度:%d，宽度:%d", hight, width);
            MessageBox(NULL, buf, "消息处理", MB_OK);
        }
    }
    default:
        break;
    }
    return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
//注册窗口类  
BOOL Register(LPSTR lpClassName, WNDPROC wndProc)
{
    WNDCLASSEX wce = { 0 };
    wce.cbSize = sizeof(wce);
    wce.cbClsExtra = 0;
    wce.cbWndExtra = 0;
    wce.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
    wce.hCursor = NULL;
    wce.hIcon = NULL;
    wce.hIconSm = NULL;
    wce.hInstance = g_hInstance;
    wce.lpfnWndProc = wndProc;
    wce.lpszClassName = lpClassName;
    wce.lpszMenuName = NULL;
    wce.style = CS_HREDRAW | CS_VREDRAW;
    ATOM nAtom = RegisterClassEx(&wce);
    if (nAtom == 0)
        return FALSE;
    return true;

}
//创建主窗口  
HWND CreateMain(LPSTR lpClassName, LPSTR lpWndName)
{
    HWND hWnd = CreateWindowEx(0, lpClassName, lpWndName,
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, g_hInstance, NULL);
    return hWnd;
}
//显示窗口  
void Display(HWND hWnd)
{
    ShowWindow(hWnd, SW_SHOW);
    UpdateWindow(hWnd);
}
//消息循环  
void Message()
{
    MSG nMsg = { 0 };
    while (GetMessage(&nMsg, NULL, 0, 0))
    {
        TranslateMessage(&nMsg);
        DispatchMessage(&nMsg);
    }
}
int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
    _In_opt_ HINSTANCE hPrevInstance,
    _In_ LPWSTR    lpCmdLine,
    _In_ int       nCmdShow)
{
    // TODO: Place code here.  
    char a[50]= "Main";
    g_hInstance = hInstance;
    BOOL nRet = Register(a, WndProc);
    if (!nRet)
    {
        MessageBox(NULL, "注册失败", "Infor", MB_OK);
        return 0;
    }
    char b[50] = "window";
    HWND hWnd = CreateMain(a, b);
    CreateWindow("Main", "子窗口",
         WS_CHILD | WS_VISIBLE | WS_POPUP, 200, 400, 400, 400,
        hWnd, NULL, g_hInstance, NULL);

    Display(hWnd);
    Message();
    return 0;
}

下面是我的，按书上格式写的：
头文件tou.h：

class CMyFrameWnd :public CFrameWnd {};
class CMyWinApp :public CWinApp {
public:
    CMyWinApp()
    {
    }
    virtual BOOL InitInstance();

};

class CMainWindow : public CFrameWnd
{
protected:


public:
    CMainWindow();

protected:
    afx_msg void OnPaint();
    afx_msg void OnLButtonDown(UINT nFlags, CPoint point);

    DECLARE_MESSAGE_MAP()
};

下面是源.cpp文件：

#include <afxwin.h>
#include "tou.h"

CMyWinApp theapp;

BOOL CMyWinApp::InitInstance()
{
    m_pMainWnd = new CMainWindow;
    m_pMainWnd->ShowWindow(SW_SHOW);
    m_pMainWnd->UpdateWindow();
    return TRUE;
}

BEGIN_MESSAGE_MAP(CMainWindow, CFrameWnd)
    ON_WM_PAINT()
    ON_WM_LBUTTONDOWN()
    ON_WM_SETCURSOR()

END_MESSAGE_MAP()

CMainWindow::CMainWindow()
{
    CRect rect1(0, 0, GetSystemMetrics(SM_CXSCREEN) / 2, GetSystemMetrics(SM_CYSCREEN) / 2);
    char aa[50] = "Main";
    char bb[50] = "window";
    HINSTANCE g_hInstance = 0;

    HWND m_hWnd = CreateWindowEx(0, aa, bb,
        WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, g_hInstance, NULL);

    CreateWindow("Main", "子窗口",
        WS_OVERLAPPEDWINDOW | WS_CHILD | WS_VISIBLE | WS_POPUP, CW_USEDEFAULT, CW_USEDEFAULT, 400, 200,
        m_hWnd, NULL, g_hInstance, NULL);
}

void CMainWindow::OnPaint()
{

}

void CMainWindow::OnLButtonDown(UINT nFlags, CPoint point)
{

}

我的程序一运行就有winocc.cpp的断言报错

不知道有没有人能赐教！

Answer 1

你触发了断点，把断点删除执行，或者直接运行!