我正在编写一个具有自定义框架窗口的应用程序。 我访问了这些网站，并使用它们都创建了自己的应用程序：

Winprog

还有：

Microsoft Docs: Custom frame window using dwm

我使用TDM_GCC和C语言编写此应用。 该应用成功使用某些链接器进行了编译；但我的自定义框架窗口不可拖动且无法调整大小。 请帮助我解决我的问题。 我的代码如下：

#include <windows.h>
#include <windowsx.h>
#include <winuser.h>
#include <dwmapi.h>
#include <stdbool.h>

const char g_szClassname[] = "myWindowClass";

LRESULT HitTestNCA(HWND hWnd,WPARAM wParam,LPARAM lParam)
{
    POINT ptMouse = { GET_X_LPARAM(lParam),GET_Y_LPARAM(lParam)};

    RECT rcWindow;
    GetWindowRect(hWnd,&rcWindow); 

    RECT rcFrame = { 0 };
    AdjustWindowRectEx(&rcFrame,WS_OVERLAPPedwinDOW & ~WS_CAPTION,false,WS_EX_CLIENTEDGE);

    USHORT uRow = 1;
    USHORT uCol = 1;
    bool fOnResizeBorder = false;

    if (ptMouse.y >= rcWindow.top && ptMouse.y < rcWindow.top + 50)
    {
        fOnResizeBorder = (ptMouse.y < (rcWindow.top - rcFrame.top));
        uRow = 0;
    }
    else if (ptMouse.y < rcWindow.bottom && ptMouse.y >= rcWindow.bottom - 50)
    {
        uRow = 2;
    }

    if (ptMouse.x >= rcWindow.left && ptMouse.x < rcWindow.left + 50)
    {
        uCol = 0; // left side
    }
    else if (ptMouse.x < rcWindow.right && ptMouse.x >= rcWindow.right - 50)
    {
        uCol = 2; // right side
    }

    LRESULT hitTests[3][3] = 
    {
        { HTTOPLEFT,fOnResizeBorder ? HTTOP : HTCAPTION,HTTOPRIGHT },{ HTLEFT,HTNOWHERE,HTRIGHT },{ HTBOTTOMLEFT,HTBOTTOM,HTBOTTOMRIGHT },};

    return hitTests[uRow][uCol];
}

LRESULT CALLBACK WndProc(HWND hwnd,UINT msg,LPARAM lParam)
{        
    MARGINS m = {50,50,50};
    bool f = false;
    LRESULT l = 0;
    HRESULT hr = S_OK;
    RECT rcClient;

    if(msg == WM_actIVATE){
        hr = DwmExtendFrameIntoClientArea(hwnd,&m);
        f = true;
        l = 0;
    }

    if(msg == WM_NCCALCSIZE){
        wParam = true;
        return 0;
    }

    if(msg == WM_CREATE){
        GetWindowRect(hwnd,&rcClient);
        setwindowpos(hwnd,NULL,rcClient.left,rcClient.top,800,600,SWP_FRAMECHANGED);
        f = true;
        l = 0;
    }

    if ((msg == WM_NCHITTEST) && (l == 0)){
        l = HitTestNCA(hwnd,wParam,lParam);
        if (l != HTNOWHERE)
        f = false;
    }

    return DefWindowProc(hwnd,msg,lParam);
}

int WINAPI Winmain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
    WNDCLASSEX wc;
    HWND hwnd;
    MSG Msg;

    wc.cbSize        = sizeof(WNDCLASSEX);
    wc.style         = 0;
    wc.lpfnWndProc   = WndProc;
    wc.cbClsExtra    = 0;
    wc.cbWndExtra    = 0;
    wc.hInstance     = hInstance;
    wc.hIcon         = LoadIcon(NULL,IDI_APPLICATION);
    wc.hCursor       = LoadCursor(NULL,IDC_ARROW);
    wc.hbrBackground = (HBRUSH)(NULL_PEN);
    wc.lpszMenuName  = NULL;
    wc.lpszClassname = g_szClassname;
    wc.hIconSm       = LoadIcon(NULL,IDI_APPLICATION);

    if(!RegisterClassEx(&wc))
    {
        MessageBox(NULL,"Window Registration Failed!","Error!",MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    hwnd = CreateWindowEx(
        WS_EX_CLIENTEDGE,g_szClassname,"The title of my window",WS_OVERLAPPedwinDOW,CW_USEDEFAULT,hInstance,NULL);

    if(hwnd == NULL)
    {
        MessageBox(NULL,"Window Creation Failed!",MB_ICONEXCLAMATION | MB_OK);
        return 0;
    }

    ShowWindow(hwnd,nCmdShow);
    UpdateWindow(hwnd);

    // Step 3: The Message Loop
    while(GetMessage(&Msg,0) > 0)
    {
        TranslateMessage(&Msg);
        DispatchMessage(&Msg);
    }
    return Msg.wParam;
}

我的项目在zip文件中：

a.zip