How to remove environment variable programmatically in windows

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This simple tutorial is for MS Visual C++. You remove an environment variable in C++ almost the same way you set it.

How to set environment variable?

char envName[256] = "Test";
SetEnvironmentVariable("VAR_NAME", envName);


How to remove environment variable? Setting the value to NULL literal deletes environment variable.
1.
2.

SetEnvironmentVariable("VAR_NAME", NULL);



How to get environment variable?

LPTSTR buffer1 = new TCHAR[256];
DWORD dwRet = GetEnvironmentVariable("VAR_NAME", buffer1, 256);

if (dwRet == 0)
{
// Environment variable does not exist
}



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