- 1 year ago
Read binary data from QProcess in Windows
In Qt, you can use the QProcess
class to read binary data from an external process, such as reading the output of a command in Windows. To achieve this, you need to redirect the standard output of the external process and then read the data from the QProcess
instance.
Here's an example of how you can do it in Qt:
cpp#include <QCoreApplication>
#include <QDebug>
#include <QProcess>
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
// Command to execute (e.g., "dir" to list files in the current directory)
QString command = "your_command_here";
QProcess process;
process.setReadChannel(QProcess::StandardOutput);
process.start(command);
if (!process.waitForStarted()) {
qDebug() << "Failed to start the process.";
return 1;
}
if (!process.waitForFinished()) {
qDebug() << "Process execution timeout or error.";
return 1;
}
QByteArray binaryData = process.readAllStandardOutput();
// Process the binary data as needed
// For example, you can write it to a file, display it, etc.
qDebug() << "Binary data size:" << binaryData.size();
return 0;
}
Replace "your_command_here"
with the actual command you want to execute. For example, if you want to read the binary data from the output of the dir
command (which lists files in the current directory), you can set command
as follows:
cppQString command = "dir";
In this code:
- We create a
QProcess
instance to interact with the external process. - We set the
readChannel
toQProcess::StandardOutput
to redirect the standard output of the external process. - We start the external process using
process.start(command)
. - We wait for the process to start and finish using
process.waitForStarted()
andprocess.waitForFinished()
. - We read the binary data from the standard output using
process.readAllStandardOutput()
.
Now you have the binary data from the output of the external process in the binaryData
variable. You can process it further according to your requirements. For example, you might write it to a file or analyze it within your Qt application.