我尝试过这个 Windows 示例从远程计算机获取 WMI 数据还有这个调用提供者方法，并且两者都在我的计算机上正常工作。不过，我尝试使用 WMI 来更改亮度，但在本部分的第 6 步中出现错误：
//Get the Next Object from the collection
hres = pEnum->Next(WBEM_INFINITE, //Timeout
1, //No of objects requested
&pObj, //Returned Object
&ulReturned /*No of object returned*/);
pEnum是一个负值。
重要提示：当我写这个问题时，我尝试了不同的计算机，但除了使用笔记本电脑外，所有计算机都出现错误。那么，如何改变显示器的亮度呢？
我还意识到，如果我转到 wbemtest.exe，在我所有的计算机中，该类WmiMonitorBrightnessMethods和方法WmiSetBrightness存在，但仅在笔记本电脑中存在它的实例。事实上，在计算机中，当我单击该类的视图对象时，我收到此消息（见图）
这是我的代码：
#define _WIN32_DCOM
#include <iostream>
using namespace std;
#include <comdef.h>
#include <Wbemidl.h>
#pragma comment(lib, "wbemuuid.lib")
int main(int iArgCnt, char ** argv)
{
HRESULT hres;
// Step 1: --------------------------------------------------
// Initialize COM. ------------------------------------------
hres = CoInitializeEx(0, COINIT_MULTITHREADED);
if (FAILED(hres))
{
cout << "Failed to initialize COM library. Error code = 0x"
<< hex << hres << endl;
return 1; // Program has failed.
}
// Step 2: --------------------------------------------------
// Set general COM security levels --------------------------
hres = CoInitializeSecurity(
NULL,
-1, // COM negotiates service
NULL, // Authentication services
NULL, // Reserved
RPC_C_AUTHN_LEVEL_DEFAULT, // Default authentication
RPC_C_IMP_LEVEL_IMPERSONATE, // Default Impersonation
NULL, // Authentication info
EOAC_NONE, // Additional capabilities
NULL // Reserved
);
if (FAILED(hres))
{
cout << "Failed to initialize security. Error code = 0x"
<< hex << hres << endl;
CoUninitialize();
return 1; // Program has failed.
}
// Step 3: ---------------------------------------------------
// Obtain the initial locator to WMI -------------------------
IWbemLocator *pLoc = NULL;
hres = CoCreateInstance(
CLSID_WbemLocator,
0,
CLSCTX_INPROC_SERVER,
IID_IWbemLocator, (LPVOID *) &pLoc);
if (FAILED(hres))
{
cout << "Failed to create IWbemLocator object. "
<< "Err code = 0x"
<< hex << hres << endl;
CoUninitialize();
return 1; // Program has failed.
}
// Step 4: ---------------------------------------------------
// Connect to WMI through the IWbemLocator::ConnectServer method
IWbemServices *pSvc = NULL;
// Connect to the local root\wminamespace
// and obtain pointer pSvc to make IWbemServices calls.
hres = pLoc->ConnectServer(
_bstr_t(L"ROOT\\WMI"),
NULL,
NULL,
0,
NULL,
0,
0,
&pSvc
);
if (FAILED(hres))
{
cout << "Could not connect. Error code = 0x"
<< hex << hres << endl;
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
cout << "Connected to ROOT\\WMI namespace" << endl;
// Step 5: --------------------------------------------------
// Set security levels for the proxy ------------------------
hres = CoSetProxyBlanket(
pSvc, // Indicates the proxy to set
RPC_C_AUTHN_WINNT, // RPC_C_AUTHN_xxx
RPC_C_AUTHZ_NONE, // RPC_C_AUTHZ_xxx
NULL, // Server principal name
RPC_C_AUTHN_LEVEL_CALL, // RPC_C_AUTHN_LEVEL_xxx
RPC_C_IMP_LEVEL_IMPERSONATE, // RPC_C_IMP_LEVEL_xxx
NULL, // client identity
EOAC_NONE // proxy capabilities
);
if (FAILED(hres))
{
cout << "Could not set proxy blanket. Error code = 0x"
<< hex << hres << endl;
pSvc->Release();
pLoc->Release();
CoUninitialize();
return 1; // Program has failed.
}
// Step 6: --------------------------------------------------
// Call WmiSetBrightness method -----------------------------
// set up to call the Win32_Process::Create method
BSTR ClassName = SysAllocString(L"WmiMonitorBrightnessMethods");
BSTR MethodName = SysAllocString(L"WmiSetBrightness");
BSTR bstrQuery = SysAllocString(L"Select * from WmiMonitorBrightnessMethods");
IEnumWbemClassObject *pEnum = NULL;
hres = pSvc->ExecQuery(_bstr_t(L"WQL"), //Query Language
bstrQuery, //Query to Execute
WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, //Make a semi-synchronous call
NULL, //Context
&pEnum /*Enumeration Interface*/);
hres = WBEM_S_NO_ERROR;
ULONG ulReturned;
IWbemClassObject *pObj;
DWORD retVal = 0;
//Get the Next Object from the collection
hres = pEnum->Next(WBEM_INFINITE, //Timeout
1, //No of objects requested
&pObj, //Returned Object
&ulReturned /*No of object returned*/);
IWbemClassObject* pClass = NULL;
hres = pSvc->GetObject(ClassName, 0, NULL, &pClass, NULL);
IWbemClassObject* pInParamsDefinition = NULL;
hres = pClass->GetMethod(MethodName, 0, &pInParamsDefinition, NULL);
IWbemClassObject* pClassInstance = NULL;
hres = pInParamsDefinition->SpawnInstance(0, &pClassInstance);
VARIANT var1;
VariantInit(&var1);
BSTR ArgName0 = SysAllocString(L"Timeout");
V_VT(&var1) = VT_BSTR;
V_BSTR(&var1) = SysAllocString(L"0");
hres = pClassInstance->Put(ArgName0,
0,
&var1,
CIM_UINT32); //CIM_UINT64
VariantClear(&var1);
VARIANT var;
VariantInit(&var);
BSTR ArgName1 = SysAllocString(L"Brightness");
V_VT(&var2) = VT_BSTR;
V_BSTR(&var2) = SysAllocString(L"80"); //Brightness value
hres = pClassInstance->Put(ArgName1,
0,
&var2,
CIM_UINT8);
VariantClear(&var2);
// Call the method
VARIANT pathVariable;
VariantInit(&pathVariable);
hres = pSvc->ExecMethod(pathVariable.bstrVal,
MethodName,
0,
NULL,
pClassInstance,
NULL,
NULL);
VariantClear(&pathVariable);
return 0;
}
正如阿米特·沙基亚（Amit Shakya）所说。只有在可以动态设置亮度的系统（笔记本电脑和某些一体机设备）中才可以通过 WMI 更改亮度。
然而，微软有一个功能可以让你改变外接显示器的亮度，SetMonitorBrightness.
See 微软图书馆
我附上一个简单的例子来说明如何做到这一点：
// Includes
#include "PhysicalMonitorEnumerationAPI.h"
#include "HighLevelMonitorConfigurationAPI.h"
(...)
// Prepare variables
HMONITOR hMonitor = NULL;
HMONITOR hMonitorTest = NULL;
DWORD cPhysicalMonitors;
LPPHYSICAL_MONITOR pPhysicalMonitors = NULL;
// Get the screen
HWND hWnd = GetDesktopWindow();
hMonitor = MonitorFromWindow(hWnd, MONITOR_DEFAULTTOPRIMARY);
_BOOL success = GetNumberOfPhysicalMonitorsFromHMONITOR(hMonitor, &cPhysicalMonitors);
if(success)
{
pPhysicalMonitors = (LPPHYSICAL_MONITOR)malloc(cPhysicalMonitors* sizeof(PHYSICAL_MONITOR));
if(pPhysicalMonitors != NULL)
{
success = GetPhysicalMonitorsFromHMONITOR(hMonitor,cPhysicalMonitors, pPhysicalMonitors);
HANDLE hPhysicalMonitor = pPhysicalMonitors[0].hPhysicalMonitor;
// Set brightness to 50%
DWORD dwNewBrightness = 50;
success = SetMonitorBrightness(hPhysicalMonitor, dwNewBrightness);
// Free resources
free(pPhysicalMonitors);
}
}