我想在我的 Qt 应用程序之间创建双向通信。我想使用 QProcess 来做到这一点。我从根应用程序成功调用子应用程序并发送测试数据而没有任何错误,但我无法在子应用程序中接收任何数据。我将不胜感激任何帮助。我正在使用 Qt 4.7.1。在我的测试代码下面:
根应用程序:
InterProcess::InterProcess(QObject *parent) : QProcess(parent)
{
process = new QProcess(this);
process->start(myChildApp);
process->waitForStarted();
process->setCurrentWriteChannel(QProcess::StandardOutput);
process->write("Test");
connect( process, SIGNAL(error(QProcess::ProcessError)), this, SLOT(error(QProcess::ProcessError)) );
connect( process, SIGNAL(readyReadStandardError()), this, SLOT(readyReadStandardError()) );
connect( process, SIGNAL(readyReadStandardOutput()), this, SLOT(readyReadStandardOutput()) );
QByteArray InterProcess::read()
{
QByteArray readBuffer = process->readAllStandardOutput();
return readBuffer;
}
void InterProcess::error( QProcess::ProcessError error )
{
qDebug() << "Error!";
qDebug() << error;
}
void InterProcess::readyReadStandardError()
{
qDebug() << "Ready to read error.";
qDebug() << process->readAllStandardError();
}
void InterProcess::readyReadStandardOutput()
{
qDebug() << "The output:";
QByteArray readBuffer = process->readAllStandardOutput();
qDebug() << readBuffer;
}
子应用:
InterProcess::InterProcess(QObject *parent) : QProcess(parent)
{
process = new QProcess();
process->setCurrentReadChannel(QProcess::StandardOutput);
connect( process, SIGNAL(readyRead()), this, SLOT(readyReadStandardOutput()));
connect( process, SIGNAL(error(QProcess::ProcessError)), this, SLOT(error(QProcess::ProcessError)) );
connect( process, SIGNAL(readyReadStandardError()), this, SLOT(readyReadStandardError()) );
connect( process, SIGNAL(readyReadStandardOutput()), this, SLOT(readyReadStandardOutput()) );
process->waitForReadyRead(5000);
}
void InterProcess::readyReadStandardError()
{
qDebug() << "Ready to read error.";
qDebug() << process->readAllStandardError();
setText("REady error");
}
void InterProcess::readyReadStandardOutput()
{
setMessage("2");
qDebug() << "The output:";
QByteArray readBuffer = process->readAllStandardOutput();
qDebug() << readBuffer;
}
void InterProcess::error( QProcess::ProcessError error )
{
qDebug() << "Error!";
qDebug() << error;
setText(QString(error));
}