After setting environment, QProcess::start() no effect.

[wysota]

I have ever set the env like : env <<"PATH = /home/azhang/env/tool.env" ,
but the result is same. Why?

Setting PATH before running QProcess has little sense. What are you trying to obtain this way? Because the only thing I can think about is that you'll be running bash to execute a script that runs some other programs which are not in the system path - but then you could have set that path directly in the script itself.

Besides, "/home/azhang/env/tool.env" doesn't look like a directory name, it's more likely a file, so setting it to PATH doesn't make sense.

[ChrisW67]

I have ever set the env like : env <<"PATH = /home/azhang/env/tool.env" ,
but the result is same. Why?

The space either side of the "=" sign may cause issues.

env << "TMPDIR=C:\\MyApp\\temp";

env << "TMPDIR=C:\\MyApp\\temp";

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is good and

env << "TMPDIR = C:\\MyApp\\temp";

env << "TMPDIR = C:\\MyApp\\temp";

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is probably not.