在QT应用程序中使用win32的窗体

时间：2010-06-02 来源：landuochong

http://blog.csdn.net/tingsking18/archive/2009/11/07/4781619.aspx

首先要从QT的网站下载qtwinmigrate-2.8-opensource.zip，然后从QWinHost继承一个类

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class HostWindow : public QWinHost
{
Q_OBJECT
public:
HostWindow(QWidget *parent = 0, Qt::WFlags f = 0)
: QWinHost(parent, f)
{
setFocusPolicy(Qt::StrongFocus);
}
HWND createWindow(HWND parent, HINSTANCE instance)
{
static ATOM windowClass = 0;
if (!windowClass)
{
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = instance;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = L"qtest";
wcex.hIconSm = NULL;
windowClass = RegisterClassEx(&wcex);
}
HWND hwnd = CreateWindow((TCHAR*)windowClass, 0, WS_CHILD|WS_CLIPSIBLINGS|WS_TABSTOP,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, parent, NULL, instance, NULL);
return hwnd;
}
signals:
void message(const QString &msg, int timeout);
public slots:
void returnPressed()
{
QMessageBox::information(topLevelWidget(), "Message from Qt", "Return pressed in QLineEdit!");
}
protected:
static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
QWidget *widget = QWidget::find(GetParent(hWnd));
HostWindow *window = qobject_cast<HostWindow*>(widget);
if (window) switch (message)
{
case WM_LBUTTONDOWN:
window->message("clicked", 1000);
break;
case WM_SETFOCUS:
window->message("SetFocus for Win32 window!", 1000);
break;
case WM_KILLFOCUS:
window->message("KillFocus for Win32 window!", 1000);
break;
case WM_MOUSEMOVE:
window->message("Moving the mouse, aren't we?", 200);
break;
case WM_KEYDOWN:
if (wParam != VK_TAB)
window->message("Key Pressed!", 500);
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}
};

class HostWindow : public QWinHost { Q_OBJECT public: HostWindow(QWidget *parent = 0, Qt::WFlags f = 0) : QWinHost(parent, f) { setFocusPolicy(Qt::StrongFocus); } HWND createWindow(HWND parent, HINSTANCE instance) { static ATOM windowClass = 0; if (!windowClass) { WNDCLASSEX wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = (WNDPROC)WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = instance; wcex.hIcon = NULL; wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wcex.lpszMenuName = NULL; wcex.lpszClassName = L"qtest"; wcex.hIconSm = NULL; windowClass = RegisterClassEx(&wcex); } HWND hwnd = CreateWindow((TCHAR*)windowClass, 0, WS_CHILD|WS_CLIPSIBLINGS|WS_TABSTOP, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, parent, NULL, instance, NULL); return hwnd; } signals: void message(const QString &msg, int timeout); public slots: void returnPressed() { QMessageBox::information(topLevelWidget(), "Message from Qt", "Return pressed in QLineEdit!"); } protected: static LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { QWidget *widget = QWidget::find(GetParent(hWnd)); HostWindow *window = qobject_cast<HostWindow*>(widget); if (window) switch (message) { case WM_LBUTTONDOWN: window->message("clicked", 1000); break; case WM_SETFOCUS: window->message("SetFocus for Win32 window!", 1000); break; case WM_KILLFOCUS: window->message("KillFocus for Win32 window!", 1000); break; case WM_MOUSEMOVE: window->message("Moving the mouse, aren't we?", 200); break; case WM_KEYDOWN: if (wParam != VK_TAB) window->message("Key Pressed!", 500); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } };

解释一下上面的HostWindow类，

1. HostWindow类继承了QWinHost并且实现了在QWinHost中定义的虚函数createWindow()，createWindow()调用API函数RegisterClassEx注册窗口类。然后再调用Windows的API函数CreateWindow来创建窗口。

2. 下面的signals和slots都很简单。singals是给status发出显示信息的信号；slots是QLineEdit的确认信息。

3. WndProc函数也很简单，是RegisterClassEx的回调函数。用来处理windows消息的。

注意：

由于WndProc是static的，所以我们可以使用QWidget::find来将HWND转换为QWidget。

处理消息的时候要使用QWinHost所以我们通过qobject_cast<HostWindow*>将QWidget转换为HostWindow。

下面是调用方法：

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#include "main.moc"
int main(int argc, char **argv)
{
QApplication a(argc, argv);
QMainWindow mw;
mw.menuBar()->addMenu("&File")->addAction("&Exit", &a, SLOT(quit()));
QWidget central(&mw);
QLineEdit edit(¢ral);
HostWindow host(¢ral);
QObject::connect(&host, SIGNAL(message(const QString&,int)), mw.statusBar(), SLOT(showMessage(const QString&,int)));
QObject::connect(&edit, SIGNAL(returnPressed()), &host, SLOT(returnPressed()));
QVBoxLayout vbox(¢ral);
vbox.addWidget(&edit);
vbox.addWidget(&host);
mw.setCentralWidget(¢ral);
mw.show();
return a.exec();
}

#include "main.moc" int main(int argc, char **argv) { QApplication a(argc, argv); QMainWindow mw; mw.menuBar()->addMenu("&File")->addAction("&Exit", &a, SLOT(quit())); QWidget central(&mw); QLineEdit edit(¢ral); HostWindow host(¢ral); QObject::connect(&host, SIGNAL(message(const QString&,int)), mw.statusBar(), SLOT(showMessage(const QString&,int))); QObject::connect(&edit, SIGNAL(returnPressed()), &host, SLOT(returnPressed())); QVBoxLayout vbox(¢ral); vbox.addWidget(&edit); vbox.addWidget(&host); mw.setCentralWidget(¢ral); mw.show(); return a.exec(); }

大家要注意一点：

我们的class在.cpp文件中实现的时候，并且包含Q_OBJECT宏的时候。我们在使用的时候要#include "main.moc"

包含.moc文件。因为.moc文件是moc将Q_OBJECT宏展开后的结果。如果我们直接编译的话，编译器是不认识

Q_OBJECT宏的。