QT 下新建windows窗体

   这几天做windows上进程通信发现,windows消息只能在窗口之间传递,不能在控制台之间传递,因为控制台程序没有消息循环,无法接收消息. 普通控制台程序不能提供消息循环,但是QT是提供(app.exec())消息循环的,也就是说是可以接收windows消息的. 

  先看一下windows新建窗口代码,经典的windows图形程序: 

#include <windows.h> 
#include <stdio.h>

int WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int); 
BOOL InitApplication(HINSTANCE); 
BOOL InitInstance(HINSTANCE, int); 
LRESULT CALLBACK MainWndProc(HWND, UINT, WPARAM, LPARAM); 
 
HINSTANCE hinst; // 窗口句柄

// windows GUI入口
int WINAPI WinMain(HINSTANCE hinstance, HINSTANCE hPrevInstance, 
    LPSTR lpCmdLine, int nCmdShow) 
{ 
    if (!InitApplication(hinstance)) 
        return FALSE; 
 
    if (!InitInstance(hinstance, nCmdShow)) 
        return FALSE; 
 
	// 循环派发消息
	MSG msg; 
    while (GetMessage(&msg, (HWND) NULL, 0, 0)) 
    { 
        TranslateMessage(&msg); 
        DispatchMessage(&msg); 
    } 
    return msg.wParam; 
} 
 
// 注册窗口
BOOL InitApplication(HINSTANCE hinstance) 
{ 
    WNDCLASSEX wcx; 
    wcx.cbSize = sizeof(wcx);         
    wcx.style = CS_HREDRAW|CS_VREDRAW;               
    wcx.lpfnWndProc = MainWndProc;    
    wcx.cbClsExtra = 0;               
    wcx.cbWndExtra = 0;              
    wcx.hInstance = hinstance;        
    wcx.hIcon = LoadIcon(NULL,IDI_APPLICATION);           
    wcx.hCursor = LoadCursor(NULL,IDC_ARROW);                  
    wcx.hbrBackground = (HBRUSH)(COLOR_BACKGROUND);              
    wcx.lpszMenuName =  NULL;    
    wcx.lpszClassName = "MainWClass"; 
    wcx.hIconSm = NULL;
 
    return RegisterClassEx(&wcx); 
} 
 
// 新建窗口
BOOL InitInstance(HINSTANCE hinstance, int nCmdShow) 
{ 
    HWND hwnd; 
 
    hinst = hinstance;  
 
    hwnd = CreateWindow( 
        "MainWClass",        // name of window class 
        "Sample",            // title-bar string 
        WS_OVERLAPPEDWINDOW, // top-level window 
        CW_USEDEFAULT,       // default horizontal position 
        CW_USEDEFAULT,       // default vertical position 
        200,       // default width 
        200,       // default height 
        (HWND) NULL,         // no owner window 
        (HMENU) NULL,        // use class menu 
        hinstance,           // handle to application instance 
        (LPVOID) NULL);      // no window-creation data 
 
    if (!hwnd) 
        return FALSE; 
 
    ShowWindow(hwnd, nCmdShow); 
    UpdateWindow(hwnd); 

    return TRUE;
} 

// 消息处理中心
LRESULT CALLBACK MainWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	PAINTSTRUCT ps;
	switch (message) 
	{
	case WM_CREATE:
	case WM_SHOWWINDOW:
	case WM_KEYDOWN:
	case WM_COMMAND:
		return ::DefWindowProc(hWnd, message, wParam, lParam);
	case WM_LBUTTONDOWN: // 按下鼠标左键
		{
			MessageBox(GetFocus(), "Hello", "Hello", MB_OK|MB_ICONASTERISK);
			break;
		}
	case WM_NOTIFYFORMAT: // 用户登录通知事件
		{
			MessageBox(GetFocus(), "Notify", "Hello", MB_OK|MB_ICONASTERISK);
			break;
		}
	case WM_SETTEXT:
		{
			MessageBox(GetFocus(), "SET TEXT", "Hello", MB_OK|MB_ICONASTERISK);
			break;
		}
	case WM_COPYDATA: // 传递数据
		{
			COPYDATASTRUCT *cp=(COPYDATASTRUCT*)lParam;
			MessageBox(GetFocus(), (char*)cp->lpData, "data", MB_OK|MB_ICONASTERISK);
			return ::DefWindowProc(hWnd, message, wParam, lParam);
		}
	case WM_USER+10: // 自定义事件
		{
			MessageBox(GetFocus(), "User info Msg", "Hello", MB_OK|MB_ICONASTERISK);
			break;
		}
	case WM_DESTROY:
		PostQuitMessage(0);
		break;
	default:
		return ::DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}

 

   可以看出,windows UI需要WinMain提供当前程序句柄, 需要一循环去派发消息. QT也提供事件循环,通过GetModuleHandle(NULL)即可获取当前实例句柄,这样就可以在QT调用windows api 新建窗口

 

int main(int argc,char **argv)
{
	QApplication app(argc,argv);

        // 返回当前实例句柄 
	HINSTANCE hinstance = (HINSTANCE)GetModuleHandle(NULL);

	if (!InitApplication(hinstance)) 
		return FALSE; 

	if (!InitInstance(hinstance, SW_SHOW)) 
		return FALSE; 

	return app.exec();
}

 

  运行结果: