How to convert guid to *char

visual-c++

Solution

C'ish solution:

/* 128 bit GUID to human-readable string */
char * guid_to_str(const GUID * id, char * out) {
    int i;
    char * ret = out;
    out += sprintf(out, "%.8lX-%.4hX-%.4hX-", id->Data1, id->Data2, id->Data3);
    for (i = 0; i < sizeof(id->Data4); ++i) {
        out += sprintf(out, "%.2hhX", id->Data4[i]);
        if (i == 1) *(out++) = '-';
    }
    return ret;
}

This assumes the output buffer has been already allocated, and should be of a size of 37 bytes (including the null terminating character).

The output is of the form `"75B22630-668E-11CF-A6D9-00AA0062CE6C"`

Usage example:

GUID g;
char buffer[37];

std::cout << guid_to_str(&g, buffer);

Note:

This code exists because I had to implement GUID parsing under Linux, otherwise I would have used the Windows API function `StringFromCLSID` mentioned by @krowe.

Problem

I would like to convert a CLSID to a *char in c++ so I can display it in a text box. I am new to c++ so please make this as simple a s possible. Thanks

Original source