生成GUID函数

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// GenerateGUID.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <objbase.h>
#include <stdio.h>

#include <iostream>
using std::string;

string CreateGUID()
{

CoInitialize(NULL);

    GUID guid = {0};
    if (S_OK != ::CoCreateGuid(&guid))
    {
        return string("");
    }

    char szBuffer[64] = {0};
    _snprintf_s(szBuffer,
                sizeof(szBuffer),
                sizeof(szBuffer),
                "{%08X-%04X-%04x-%02X%02X-%02X%02X%02X%02X%02X%02X}",
                guid.Data1,
                guid.Data2,
                guid.Data3,
                guid.Data4[0],
                guid.Data4[1],
                guid.Data4[2],
                guid.Data4[3],
                guid.Data4[4],
                guid.Data4[5],
                guid.Data4[6],
                guid.Data4[7]);

CoUninitialize();
return string(szBuffer);
}

int _tmain(int argc, _TCHAR* argv[])
{

printf(CreateGUID().c_str());

printf("\n");

return 0;
}