PRL_HANDLE hVm;
PRL_HANDLE hResult;
PRL_RESULT nJobRetCode;
PRL_RESULT ret;

// Obtain a new virtual machine handle.
ret = PrlSrv_CreateVm(hServer, &hVm);
if (PRL_FAILED(ret))
{
    // Error handling goes here...
    return ret;
}

// Get the host config info.
hJob = PrlSrv_GetSrvConfig(hServer);
ret = PrlJob_Wait(hJob, 10000);

// Check the return code of PrlSrv_GetSrvConfig.
PrlJob_GetRetCode(hJob, &nJobRetCode);
if (PRL_FAILED(nJobRetCode))
{
    fprintf(stderr, "Error: %s\n", PRL_RESULT_TO_STRING(nJobRetCode));
    PrlHandle_Free(hJob);
    PrlHandle_Free(hVm);
    return nJobRetCode;
}

// Get a handle to the object containing the result of PrlSrv_GetSrvConfig,
// and then get a handle to the server configuration object from it.
ret = PrlJob_GetResult(hJob, &hResult);
PRL_HANDLE hSrvCfg;
PrlResult_GetParam(hResult, &hSrvCfg);

// Delete the job and the result handles.
PrlHandle_Free(hJob);
PrlHandle_Free(hResult);

// Now that we have the host machine configuration data,
// we can set the default configuration for the new virtual machine.
ret = PrlVm_SetDefaultConfig(
                hVm, // VM handle.
                hSrvCfg, // Host config data.
                PVS_GUEST_TYPE_WINDOWS, // Target OS type.
                PVS_GUEST_VER_WIN_2003, // Target OS version.
                PRL_TRUE); // Create and connect devices.

if (PRL_FAILED(ret))
{
    fprintf(stderr, "Error: %s\n", PRL_RESULT_TO_STRING(ret));
    PrlHandle_Free(hSrvCfg);
    PrlHandle_Free(hVm);
    return ret;
}

PrlHandle_Free(hSrvCfg);

// Set the virtual machine name.
ret = PrlVm_SetName(hVm, "My Windows Server 2003");

// The following two calls demonstrate how to modify
// some of the default values of the virtual machine configuration.
// These calls are optional. You may remove them to use the default values.

// Set the RAM size for the machine to 256 MB.
ret = PrlVm_SetRamSize(hVm, 256);

// Set the virtual hard disk size to 20 GB.
// First, get the handle to the hard disk object using the
// PrlVm_GetHardDisk function. The index of 0 is used
// because the default configuration has just one virtual hard disk.
// After that, use the handle to set the disk size to the desired value.

PRL_HANDLE hHDD;
ret = PrlVm_GetHardDisk(hVm, 0, &hHDD);
ret = PrlVmDevHd_SetDiskSize(hHDD, 20000);

// Create and register the machine with the Parallels Service.
hJob = PrlVm_Reg(hVm, // VM handle.
                 "", // VM root directory (using default).
                 PRL_TRUE); // Using non-interactive mode.

// Wait for the operation to complete.
ret = PrlJob_Wait(hJob, 10000);

// Check the return code of PrlVm_Reg.
PrlJob_GetRetCode(hJob, &nJobRetCode);
if (PRL_FAILED(nJobRetCode))
{
    fprintf(stderr, "Error: %s\n", PRL_RESULT_TO_STRING(nJobRetCode));
    PrlHandle_Free(hJob);
    PrlHandle_Free(hVm);
    return nJobRetCode;
}

// Delete handles.
PrlHandle_Free(hJob);
PrlHandle_Free(hVm);