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

[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.