在终端工作，但不是通过QProcess。-Commandworkinginterminal,butnotviaQProcess

34  

QProcess executes one single process. What you are trying to do is executing a shell command, not a process. The piping of commands is a feature of your shell.

QProcess执行一个进程。您要做的是执行shell命令，而不是过程。命令的管道是shell的一个特性。

There are three possible solutions:

有三种可能的解决方案:

Put the command you want to be executed as an argument to sh after -c ("command"):

将您想要执行的命令作为sh在-c(“命令”)后面的参数执行:

QProcess sh;
sh.start("sh", QStringList() <<"-c" <<"ifconfig | grep inet");

sh.waitForFinished();
QByteArray output = sh.readAll();
sh.close();

Or you could write the commands as the standard input to sh:

或者您可以将命令作为标准输入写入sh:

QProcess sh;
sh.start("sh");

sh.write("ifconfig | grep inet");
sh.closeWriteChannel();

sh.waitForFinished();
QByteArray output = sh.readAll();
sh.close();

Another approach which avoids sh, is to launch two QProcesses and do the piping in your code:

另一种避免sh的方法是启动两个qprocess并在代码中执行管道:

QProcess ifconfig;
QProcess grep;

ifconfig.setStandardOutputProcess(&grep); // "simulates" ifconfig | grep

ifconfig.start("ifconfig");
grep.start("grep", QStringList() <<"inet"); // pass arguments using QStringList

grep.waitForFinished(); // grep finishes after ifconfig does
QByteArray output = grep.readAll(); // now the output is found in the 2nd process
ifconfig.close();
grep.close();

6  

The QProcess object does not automatically give you full blown shell syntax: you can not use pipes. Use a shell for this:

QProcess对象不会自动给出完整的shell语法:您不能使用管道。使用外壳:

p1.start("/bin/sh -c \"ifconfig | grep inet\"");

4  

You can not use the pipe symbol in QProcess it seems.

在QProcess中，您不能使用管道符号。

However there is the setStandardOutputProcess Method that will pipe the output to the next process.

但是，有一个setStandardOutputProcess方法，它将输出到下一个进程。

An example is provided in the API.

API中提供了一个示例。