CODEWITHSUNDEEP
windowswinapienvironment-variables
Benjamin
Benjamin

Reputation: 10403

Using Windows Environment Variable in Native Code

// I have a permission to create a file to Program Files
const std::wstring sFileName = L"%ProgramFiles%\\aaa.txt";
HANDLE h = CreateFileW(
  sFileName.c_str(),
  GENERIC_READ,
  FILE_SHARE_DELETE,
  0,
  CREATE_ALWAYS,
  0,
  0);
// INVALID_HANDLE_VALUE with ERROR_PATH_NOT_FOUND

I expected it makes C:\Program Files\aaa.txt or C:\Program Files (x86)\aaa.txt depend on the Os' environment. But it didn't work.
What's wrong? How do I use environment variable in native code?

Upvotes: 2

Views: 3172

Answers (2)

Robert Horvick
Robert Horvick

Reputation: 4036

You need to explicitly expand the environment variables. One way is using the Win32 API's ExpandEnvironmentStrings or ExpandEnvironmentStringsForUser

Upvotes: 6

RRUZ
RRUZ

Reputation: 136441

try using the GetEnvironmentVariable function

Upvotes: 4

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