QProcess问题执行带有参数的exe

Question

I have a issue in setting the QProcess to run executable with the arguments. The Qt code for the same is as below,

QString program = "C:\Setup.exe";
QStringList arguments;
arguments << "-uninstall";
QProcess::startDetached(program, arguments);

The output of this snippet is to uninstall some program. But it is not happening. Am i doing any mistake?

But if I go to cmd prompt and execute the same thing like.,

c:/> "C:/Setup.exe" -uninstall This works perfectly.

Answer 1

There are at least two options to solve your issue.

• Use '/' for directory separators as per documentation:

  If you always use "/", Qt will translate your paths to conform to the underlying operating system.

• Escape the backslash whenever working with file paths as string as per an example from the documentation:

   env.insert("TMPDIR", "C:\\\\MyApp\\\\temp"); // Add an environment variable env.insert("PATH", env.value("Path") + ";C:\\\\Bin"); 

Therefore, you should be writing something like this:

QString program = "C:/Setup.exe";
QStringList arguments;
arguments << "-uninstall";
QProcess::startDetached(program, arguments);

or this:

QString program = "C:\\Setup.exe";
QStringList arguments;
arguments << "-uninstall";
QProcess::startDetached(program, arguments);

In general, when facing such issues, you could always print out the error string to get more information by using the following syntax:

qDebug() << myProcess.errorString();

This, for sure, needs an instance, however.