QT打开计算器，模拟按键ctrl+u

[邹土豆]

我在界面上放了一个按钮，通过点击一次按钮，打开计算器程序，并且给计算器发送 ctrl+u 的按键信息。
现在打开和发送信息都能实现了，不过需要点两次按钮，如果只点一次的话，只能实现打开计算器，发送按键信息不成功。

.h文件代码：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <qpushbutton.h>
#include <qmessagebox.h>
#include <qprocess.h>
#include <Windows.h>
#include <CommCtrl.h>
#include <QTextCodec>
//#include <QString>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();
    QPushButton *pushButton;
    QPushButton *pushButton_2;
    void openExe();
    void loadFile();
private slots:
    void on_pushButton_clicked();
private:
    Ui::MainWindow *ui;
};

#endif // MAINWINDOW_H

.cpp文件代码：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#pragma comment(lib, "user32.lib")

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    //connect(pushButton_2,SIGNAL(clicked(bool)),this,SLOT(testSignal()));
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::on_pushButton_clicked()
{
    openExe();
    loadFile();
}

void MainWindow::openExe()
{
    QProcess *poc = new QProcess;
    poc->start("C:\\Windows\\system32\\calc.exe");
}

void MainWindow::loadFile()
{
    HWND pWnd = NULL;
    while(pWnd == NULL)
    {
        Sleep(10);
        pWnd = FindWindowExA(0,0,0,"计算器");

    }
    if(pWnd != 0)
    {

        keybd_event(VK_CONTROL,0,KEYEVENTF_EXTENDEDKEY|0,0);
        PostMessage(pWnd,WM_SYSKEYDOWN,0x55,0);
        PostMessage(pWnd,WM_SYSKEYUP,0x55,0);
        keybd_event(VK_CONTROL,0,KEYEVENTF_EXTENDEDKEY|KEYEVENTF_KEYUP,0);
    }
    else
    {
        QMessageBox::information(this, QString::fromLocal8Bit("cannot find "),QString::fromLocal8Bit("yes"));
    }
}

希望大家帮忙看下，谢谢！

[dext]

QProcess* poc = new QProcess;
    poc->start("C:\\Windows\\system32\\calc.exe");
    HWND pWnd = NULL;
    while (pWnd == NULL) {
        Sleep(10);
        pWnd = FindWindowExA(0, 0, 0, "Calculator");
    }
    if (pWnd != 0) {
        SendMessage(pWnd, WM_COMMAND, 975, 0);
    } else {
        QMessageBox::information(this, QString::fromLocal8Bit("cannot find "), QString::fromLocal8Bit("yes"));
    }

[邹土豆]

引用 1 楼 dext 的回复:

QProcess* poc = new QProcess;
    poc->start("C:\\Windows\\system32\\calc.exe");
    HWND pWnd = NULL;
    while (pWnd == NULL) {
        Sleep(10);
        pWnd = FindWindowExA(0, 0, 0, "Calculator");
    }
    if (pWnd != 0) {
        SendMessage(pWnd, WM_COMMAND, 975, 0);
    } else {
        QMessageBox::information(this, QString::fromLocal8Bit("cannot find "), QString::fromLocal8Bit("yes"));
    }

我试了下，好像还是不行。 但是在 openExe()和 loadFile() 中间加一个 QMessageBox::information(this, QString::fromLocal8Bit(" find success"), QString::fromLocal8Bit("yes")); 就能用了，不知道什么原因。能帮忙看下么，谢谢啦

[dext]

粘贴代码你就不看也不改么？你的是中文版怎么能找到 英文的标题。

引用 2 楼 niker_co 的回复:

[quote=引用 1 楼 dext 的回复:]

QProcess* poc = new QProcess;
    poc->start("C:\\Windows\\system32\\calc.exe");
    HWND pWnd = NULL;
    while (pWnd == NULL) {
        Sleep(10);
        pWnd = FindWindowExA(0, 0, 0, "Calculator");
    }
    if (pWnd != 0) {
        SendMessage(pWnd, WM_COMMAND, 975, 0);
    } else {
        QMessageBox::information(this, QString::fromLocal8Bit("cannot find "), QString::fromLocal8Bit("yes"));
    }

我试了下，好像还是不行。 但是在 openExe()和 loadFile() 中间加一个 QMessageBox::information(this, QString::fromLocal8Bit(" find success"), QString::fromLocal8Bit("yes")); 就能用了，不知道什么原因。能帮忙看下么，谢谢啦[/quote]

[bestman]

void MainWindow::loadFile()
{
    HWND pWnd = NULL;
    while(pWnd == NULL)
    {
        Sleep(10);
        pWnd = FindWindowExA(0,0,0,"计算器");

    }
    SetForegroundWindow(pWnd);//添加
    if(pWnd != 0)
    {

        keybd_event(VK_CONTROL,0,KEYEVENTF_EXTENDEDKEY|0,0);
        PostMessage(pWnd,WM_SYSKEYDOWN,0x55,0);
        PostMessage(pWnd,WM_SYSKEYUP,0x55,0);
        keybd_event(VK_CONTROL,0,KEYEVENTF_EXTENDEDKEY|KEYEVENTF_KEYUP,0);
    }
    else
    {
        QMessageBox::information(this, QString::fromLocal8Bit("cannot find "),QString::fromLocal8Bit("yes"));
    }
}

[bestman]

SetForegroundWindow(pWnd); 添加这一句，可以把设置当前窗口为活动窗口