request about scp command (QProcess) using qt

JonB

@hlowd Your literal C++ string "scp file.ini user@192.168.0.1:\home\user\path" has single backslashes in it.

hlowd

This post is deleted!

hlowd

In the actual code, I entered two backslashes.

Additionally, by using the exeexcute function rather than the start function, no additional parameters were entered, and a response was received immediately.

Only the scp command did not work.

jsulm

@hlowd said in request about scp command (QProcess) using qt:

In the actual code, I entered two backslashes

Please post real code you're using to avoid such confusion.
"Only the scp command did not work" - so does it work now or not?
Did you add error handling as suggested?

hlowd

@hlowd

This is the original source code.
What's wrong?

ps) I added two backslashes to the content, but only one is visible.

//-----------------------------------
// header
//-----------------------------------
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QProcess>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
QProcess *m_process;

private slots:
void on_pushButton_clicked();
void readOutput();

private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

//----------------------------------------
//cpp
//-----------------------------------------
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <qDebug>

MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
}

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

void MainWindow::on_pushButton_clicked()
{
m_process = new QProcess(this);
QStringList listArguments;

#if 0
QString strParam = "scp";
listArguments << "D:\SVN\Work\test\a.ini user@192.168.1.250:\home\user\SW\";
#else
QString strParam = "ipconfig";
listArguments << "/all";
#endif
connect(m_process, SIGNAL(readyReadStandardError()), this, SLOT(readOutput()));
connect(m_process, SIGNAL(readyReadStandardOutput()), this, SLOT(readOutput()));
connect(m_process, SIGNAL(errorOccurred()), this, SLOT(readOutput()));

m_process->start(strParam, listArguments);
m_process->waitForFinished();

if(m_process)
    delete m_process;

}

void MainWindow::readOutput()
{
QString StdOut = m_process->readAllStandardOutput();
QString StdError = m_process->readAllStandardError();
QString StdError1 = m_process->errorString();
qDebug() << "======================================\n";
qDebug() << StdOut;
qDebug() << StdError;
qDebug() << StdError1;
qDebug() << "======================================\n";
}

jsulm

@hlowd said in request about scp command (QProcess) using qt:

listArguments << "D:\SVN\Work\test\a.ini user@192.168.1.250:\home\user\SW";

Is this really your real code?!
You again have single back-slashes.
And why do you use back-slashes for paths on Linux side?
Also that line should be:

listArguments << "D:\\SVN\\Work\\test\\a.ini" <<  "user@192.168.1.250:/home/user/SW/";

And please format you code properly.

hlowd

@hlowd

I entered two words in the post, but only one is displayed on the screen...

jsulm

@hlowd said in request about scp command (QProcess) using qt:

I entered two words in the post, but only one is displayed on the screen...

Use code tags properly, then it will be shown correctly

hlowd

@hlowd

listArguments << "D:\\SVN\\Work\\test\\a.ini" << "user@192.168.1.250:/home/user/SW/";

Even though I entered it like this, it is the same.
The response from start comes immediately, but the readOutput function is not called.

jsulm

@hlowd said in request about scp command (QProcess) using qt:

but the readOutput function is not called

Probably because you're deleting m_process right after waitForFinished.
Are you sure scp.exe command is found?
Try with an absolute path to scp.exe to make sure it is actually found.

hlowd

@hlowd

The symptom is the same even if delete is not called.

If it is a command instruction rather than a code, the instruction will be executed normally.
The file is moved normally. (Windows -> Linux)

jsulm

@hlowd Again: try with absolute path to scp.exe

hlowd

@hlowd
There are files in that path.

C:\Windows\WinSxS\amd64_openssh-common-components-onecore_31bf3856ad364e35_10.0.22621.1_none_1e3c4880a37d88bb

scp.exe
ssh-add.exe
ssh-agent.exe
ssh-keygen.exe

// new code

QString strParam = "C:\\Windows\\WinSxS\\amd64_openssh-common-components-onecore_31bf3856ad364e35_10.0.22621.1_none_1e3c4880a37d88bb\\scp.exe";

// error message

"CreateProcessW failed error:2 posix_spawn: No such file or directory"

JonB

@hlowd
If you want help on this, at least for my part, please make the effort to enclose your code blocks and literal extracts in the forums block quotes (</> button) as we have asked several times. It does not require much effort on your side.

By now you should be trying a command of scp, nothing else, no arguments, to verify that (a) it is found and can be run and (b) you can successfully read any output from it, e.g. presumably a "usage" message in this case.

jsulm

@hlowd said in request about scp command (QProcess) using qt:

Can I do it this way?

Yes, just try.
I would also execute scp using this absolute path in a terminal to make sure it works.

hlowd

@jsulm

There are files in that path.

C:\Windows\WinSxS\amd64_openssh-common-components-onecore_31bf3856ad364e35_10.0.22621.1_none_1e3c4880a37d88bb

scp.exe
ssh-add.exe
ssh-agent.exe
ssh-keygen.exe

// new code

QString strParam = "C:\\Windows\\WinSxS\\amd64_openssh-common-components-onecore_31bf3856ad364e35_10.0.22621.1_none_1e3c4880a37d88bb\\scp.exe";

// error message

"CreateProcessW failed error:2 posix_spawn: No such file or directory"

The same error occurs in the command prompt.

JonB

@hlowd
I am not a total Windows expert, but I did not think you should ever attempt to run anything in the WinSxS area? You should be running the scp which is on your PATH (presumably).

jsulm

@hlowd Did scp executable ever work for you in terminal? The path where it is located looks strange, don't know from where it comes. On my machine I have it here: c:\windows\System32\OpenSSH\scp.exe

You can check where your scp.exe is located using this command:

where scp

hlowd

@jsulm

The scp.exe file exists in that path.

C:\Windows\System32\OpenSSH

I don't know why I couldn't find it using Explorer search.

jsulm

@hlowd said in request about scp command (QProcess) using qt:

The scp.exe file exists in that path

Does it work with this path?