问题描述
我想在带有Qt的Ubuntu 10.04 LTS下使用netcat实用程序在我的设备中启动SCPI命令。我的代码如下：
I want to launch a SCPI command in my device using netcat utility under Ubuntu 10.04 LTS with Qt. My code looks like:
env = "echo TRIG | nc 192.168.1.100 23 -q1";
process1.execute(env);
process1.waitForFinished(1000);
此命令不返回任何数据，而只是触发数据获取。
如果将终端使用相同的 echo TRIG | nc 192.168.1.100 23 -q1命令，则一切正常。
从Qt，它不起作用。调试输出为 TRIG | nc 10.0.3.250 23 -q1 ...因此没有 echo。我的设备没有收到TRIG命令。
This command does not return any data but simply triggers the data acquisition.If using terminal with same "echo TRIG | nc 192.168.1.100 23 -q1" command, everything works fine.From Qt, it does not work. The debug output is "TRIG | nc 10.0.3.250 23 -q1" ... so without an "echo". My device does not receive the TRIG command.
您能告诉我我做错了什么吗？
非常感谢。
Could you please advise what I'm doing wrong?Many thanks.
推荐答案
您不能以这种方式在QProcess中使用管道命令（|）。
You can't use the pipe command (|) with QProcess that way.
有几种解决方法：-
您可以调用第一个命令并检索其输出
You can call the first command and retrieve its output before processing it either in Qt or with another call to QProcess.
或者，创建一个从QProcess调用的脚本并检索输出。
Or, create a script that you call from QProcess and retrieve the output.
最后，假设您使用的是Linux / OSX，则可以使用/ bin / bash调用QProcess并将命令传递给它。例如：-
Finally, assuming you're using linux / OSX, you can call QProcess with /bin/bash and pass the command to that. For example: -
env = "/bin/bash \"echo TRIG | nc 192.168.1.100 23 -q1\"";
process1.execute(env);
您可能会找到与Windows的/ bin / bash等效的文件，也许是cmd.exe
You can probably find an equivalent to /bin/bash for windows, perhaps cmd.exe
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