可以供MFC调用的，QT实现的DLL（qtwinmigrate实现）

MFC和QT的消息循环机制不同，所以，要让QT写的DLL可以供MFC调用，要做一点特殊的处理

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#include <qmfcapp.h>

#include <qwinwidget.h>

#include <QtGui>

#include <QtGui/QMessageBox>

#include <windows.h>

#include <QTextCodec>

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#include "widget.h"

BOOL WINAPI DllMain( HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpvReserved*/ )

{

static bool ownApplication = FALSE;

//加入本地语言支持

QTextCodec::setCodecForTr(QTextCodec::codecForLocale());

QTextCodec::setCodecForCStrings(QTextCodec::codecForLocale());

if ( dwReason == DLL_PROCESS_ATTACH )

{

ownApplication = QMfcApp::pluginInstance( hInstance );

}

if ( dwReason == DLL_PROCESS_DETACH && ownApplication )

{

qApp->quit();

delete qApp;

}

return TRUE;

}

extern "C" __declspec(dllexport) int ShowDialog( HWND parent)

{

QWinWidget win(parent, NULL, Qt::Window);

win.showCentered();

win.center();

QHBoxLayout hbox(&win);

Widget *widget = new Widget(&win);

widget->setWindowFlags(Qt::Window);

hbox.addWidget(widget);

win.show();

qApp->exec();

}

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