QProcess:未收到运行 Powershell 脚本的完成()信号 [英] QProcess: not receiving finished() signal running Powershell script

问题描述

我正在开发一个 Qt 应用程序，其中包括转换 Excel 电子表格中以标签文件分隔的文本.这是通过运行 Windows Powershell 脚本来完成的.
我的问题是 QProcess 中的 finished() 信号从未发出，尽管转换已成功完成.是的，我收到 stateChanged() 信号.

I am developing a Qt application that, among other things, converts an Excel spreadsheet in a text delimited with tab file. This is done by running a Windows Powershell script.
My problem is that the finished() signal from the QProcess is never emitted, although the conversion is done successfully. And yes, I receive stateChanged() signal.

(改编自这个问题)

param ([string]$ent = $null, [string]$sal = $null)
$xlCSV = -4158  #value for tab delimited file
$Excel = New-Object -Com Excel.Application 
$Excel.visible = $False 
$Excel.displayalerts=$False
$b = $Excel.Workbooks.Open($ent) 
$b.SaveAs($sal,$xlCSV) 
$Excel.quit()
exit 0 #tested without exit, with exit and with exit 0

Qt 应用标题

(为了测试，最小的情况是一个没有其他小部件的 QDialog.)

Qt app header

(For testing, the minimal case is a QDialog without other widgets.)

#ifndef DIALOG_H
#define DIALOG_H

#include <QDialog>
#include <QProcess>
#include <QDebug>

namespace Ui {
class Dialog;
}

class Dialog : public QDialog
{
    Q_OBJECT

    public:
    explicit Dialog(QWidget *parent = 0);
    ~Dialog();
    QProcess *proces;

    private:
        Ui::Dialog *ui;
    private slots:
        void procFinish(int estat);
        void procState(QProcess::ProcessState estat);
};

#endif // DIALOG_H

Qt 应用 C++

#include "dialog.h"
#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::Dialog)
{
    ui->setupUi(this);
    QString program = "C:/Windows/System32/WindowsPowerShell/v1.0/powershell.exe";
    QStringList params;
    params << "-File" << "C:/Garsineu/ps_excel.ps1" << "-ent" << "C:/Garsineu/PROVAGALATEA.xls" << "-sal" << "C:/Garsineu/PROVAGALATEA.tab";
    proces = new QProcess();
    connect(proces, SIGNAL(finished(int)), this, SLOT(procFinish(int)));
    connect(proces, SIGNAL(stateChanged(QProcess::ProcessState)), this, SLOT(procState(QProcess::ProcessState)));
    proces->start(program, params);
}

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

void Dialog::procFinish(int estat)
{
    qDebug() << "Finished";
}

void Dialog::procState(QProcess::ProcessState estat)
{
    qDebug() << estat;
}

尽管转换成功并显示状态 1(已启动)和状态 2(正在运行)，但永远不会显示消息已完成".
我也尝试同步做，通过waitForFinished()方法，总是超时.

Although the conversion is successful and the states 1 (Started) and 2 (Running) are shown, the message "Finished" is never displayed.
I also tried to do it synchronously, by waitForFinished () method, which is always timed out.

• Windows 7 Professional 64 位
• Powershell v1.0 x86
• 带有 minGW491_32 的 Qt 5.4.0

感谢您的帮助.谢谢.

推荐答案

我找到了解决方案.显然，Powershell 从控制台或从另一个程序(非交互式)调用时不会以相同的方式运行.如果我在 ps_excel.ps1 脚本末尾添加:

I found the solution. Apparently Powershell does not run in the same way from the console or when is called from another program (noninteractive). If I add at end of ps_excel.ps1 script:

Get-Process Powershell | Stop-Process

代替

exit 0

我真的停止Powershell并获得完成信号，QProcess::ExitStatus = 0.

I Stop really Powershell and get finished signal, with QProcess::ExitStatus = 0.

这篇关于QProcess:未收到运行 Powershell 脚本的完成()信号的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！