Create Instance of Excel Application using C++/COM

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

/* Compile using:
 * cl.exe /MD main.cpp /link /out:Test1.exe kernel32.lib user32.lib advapi32.lib ole32.lib
 */

int main(int argc, char** argv) {
    HRESULT hr = CoInitializeEx(NULL, 0);
    if (FAILED(hr)) {
        fprintf(stderr, "Unable to initialize COM (HRESULT = 0x%X)\n", hr);
        return -1;
    }

    /* Will FAILED if you don't have Microsoft Excel installed */
    GUID guid;
    hr = CLSIDFromProgID(L"Excel.Application", &guid);
    if (FAILED(hr)) {
        fprintf(stderr, "Could not get Excel.Application CLSID\nMaybe you don't have Excel installation\nHRESULT = 0x%X\n", hr);
        CoUninitialize();
        return 0;
    }

    IDispatch *pDisp = NULL;
    if (FAILED(hr = CoCreateInstance(guid, NULL, CLSCTX_LOCAL_SERVER, IID_IDispatch, (void**)&pDisp))) {
        fprintf(stderr, "CoCreateInstance() FAILED (HRESULT = 0x%X)\n", hr);
        CoUninitialize();
        return -1;
    }

    fprintf(stdout, "Got Microsoft Excel Application instance as IDispatch ( 0x%p )\n", pDisp);
    pDisp->Release();

    CoUninitialize();

    fprintf(stdout, "operations completed...\n");
    getchar();
    return 0;
}