Virtuozzo Virtualization SDK C API Reference
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Example
PrlResult_GetParam Function

The following example demonstrates using asynchronous function PrlSrv_GetSrvConfig synchronously, and the steps involved in obtaining a handle to an object of type PHT_SERVER_CONFIG (which is returned by PrlSrv_GetSrvConfig):

PRL_HANDLE hJob = PrlSrv_GetSrvConfig(hServer);

// Step 1 - emulate a synchronous call using PrlJob_Wait.

PRL_RESULT ret = PrlJob_Wait(hJob, 10000);
if (PRL_FAILED(ret))
{
    printf("PrlJob_Wait for job PrlSrv_GetSrvConfig returned error: %s\n",
        PRL_RESULT_TO_STRING(ret));

    PrlHandle_Free(hJob);
    PrlHandle_Free(hServer);
    PrlApi_Deinit();
    SdkWrap_Unload();
    return -1;
}

// Step 2 - determine if PrlSrv_GetSrvConfig succeeded or failed
// using PrlJob_GetRetCode.

PrlJob_GetRetCode(hJob, &nJobResult);
if (PRL_FAILED(nJobResult))
{
    printf("PrlSrv_GetSrvConfig returned error: %s\n",
        PRL_RESULT_TO_STRING(ret));

    PrlHandle_Free(hJob);
    PrlHandle_Free(hServer);
    PrlApi_Deinit();
    SdkWrap_Unload();
    return -1;
}

// Step 3 - Obtain a handle to the result object (a handle
// of type PHT_RESULT) using PrlJob_GetResult.

PRL_HANDLE hResult;
ret = PrlJob_GetResult(hJob, &hResult);
PrlHandle_Free(hJob); // hJob no longer needed, free it.

if (PRL_FAILED(ret))
{
    printf("PrlJob_GetResult for job PrlSrv_GetSrvConfig returned error: %s\n",
        PRL_RESULT_TO_STRING(ret));
    PrlHandle_Free(hResult);
    PrlHandle_Free(hServer);
    PrlApi_Deinit();
    SdkWrap_Unload();
    return -1;
}

// Step 4 - Get a handle to the final result (in this case,
// a handle of type PHT_SERVER_CONFIG) using PrlResult_GetParam.
// For PHT_RESULT handles that contain more than one result, first use
// PrlResult_GetParamsCount, then use PrlResult_GetParamByIndex.

PRL_HANDLE hServerConfig;
ret = PrlResult_GetParam(hResult, &hServerConfig);
PrlHandle_Free(hResult); // hResult no longer needed, free it.

if (PRL_FAILED(ret))
{
    printf("PrlResult_GetParam for job PrlSrv_GetSrvConfig returned error: %s\n",
        PRL_RESULT_TO_STRING(ret));

    PrlHandle_Free(hServerConfig);
    PrlHandle_Free(hServer);
    PrlApi_Deinit();
    SdkWrap_Unload();

    return -1;
}

// At this point, a handle of type PHT_SERVER_CONFIG is available, and
// functions that operate on PHT_SERVER_CONFIG handles can be used on
// the handle.

PRL_UINT32 nCpuCount = 0;
PrlSrvCfg_GetCpuCount(hServerConfig, &nCpuCount);
printf("Number of CPUs: %d\n", nCpuCount);

PRL_CPU_MODE CpuMode;
PrlSrvCfg_GetCpuMode(hServerConfig, &CpuMode);
printf("CPU Mode: %d bit\n", CpuMode == PCM_CPU_MODE_32 ? 32 : 64);

PRL_CHAR szCpuModel[1024];
PRL_UINT32 nCpuModelSize = sizeof(szCpuModel);
memset(szCpuModel, 0, nCpuModelSize);
PrlSrvCfg_GetCpuModel(hServerConfig, szCpuModel, &nCpuModelSize);
printf("CPU Model: %s\n", szCpuModel);

PRL_UINT32 nCpuSpeed = 0;
PrlSrvCfg_GetCpuSpeed(hServerConfig, &nCpuSpeed);
printf("CPU Speed: %.3f MHz\n", nCpuSpeed / 1000.0);

PRL_CHAR szHostOsString[1024];
PRL_UINT32 nHostOsStringSize = sizeof(szHostOsString);
PrlSrvCfg_GetHostOsStrPresentation(hServerConfig, szHostOsString, &nHostOsStringSize);
printf("Host OS: %s\n", szHostOsString);

PrlHandle_Free(hServerConfig);
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