Wild-assed guess, because you don’t even show a single line of C code: getenv(TEST_VAR)
should be getenv("TEST_VAR")
.
PS: To avoid downvotes for your next question (and possibly unhelpful answers like mine), please read http://www.catb.org/esr/faqs/smart-questions.html explaining the art of asking smart questions.
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solved Environment variable set in batch file cannot be accessed in the C code compiled by the file [closed]