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HWND h = FindWindow(NULL, QString::fromUtf8("计算器").toStdWString().c_str());
setWindowTitle(QString("%1").arg((int)h));
#include <windows.h>
void MainWindow::on_pushButton_clicked()
{
HWND h = FindWindow(NULL, ui->lineEdit->text().toStdWString().c_str());
ui->pushButton->setText(QString("%1").arg((int)h));
}