[Solved] Why can’t I display this string on MessageBox? [duplicate]

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You should read the compiler error messages.

The second and third arguments to MessageBox have to have the same type. Either you call MessageBoxA with two char *, or you call MessageBoxW with two wchar_t *.

One fix for your code would be to do MessageBoxA(NULL, buff, "User-id", MB_OK).

You are using sprintf_s incorrectly too, please read its documentation. IMHO it would be better to use the standard function snprintf:

snprintf(buff, sizeof buff, "%s", id.c_str());

Note that you could do away with buff entirely and write:

MessageBoxA(NULL, id.c_str(), "User-id", MB_OK);

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solved Why can’t I display this string on MessageBox? [duplicate]