使用WMI更改亮度 [英] Change Brightness using WMI
问题描述
我已经尝试过这个Windows示例获取WMI来自远程计算机的数据和其他调用提供者方法，两者都可以在我的计算机上正常工作.但是，我尝试使用WMI更改亮度，并且在此部分的步骤6中出现错误:
I have tried this Windows example Getting WMI Data from a Remote Computer and this other Calling a Provider Method, and both work correctly in my computer. However I have tried to use WMI to change the brightness and I am getting an error on step 6, in this part:
//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是负值.
重要提示:在撰写此问题时，我尝试使用其他计算机，但除使用笔记本电脑外，所有其他计算机均出现错误.因此，如何更改显示器的亮度?
IMPORTANT: While I was writing this question, I tried with different computers and I get errors in all of them, except when I use a laptop. Therefore, how can I change the brightness of a monitor?
我还意识到，如果我去wbemtest.exe，则在我所有的计算机中都存在类WmiMonitorBrightnessMethods和方法WmiSetBrightness，但仅在笔记本电脑中才有它的实例.实际上，在计算机上单击类的查看对象时，我会收到此消息(参见图片)
I also realize that if I go to wbemtest.exe, in all my computers the class WmiMonitorBrightnessMethods and the method WmiSetBrightness exist, but only in the laptop there is an instance of it. In fact, in the computers when I click on view objects of the class I get this message (see image)
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;
}
推荐答案
正如Amit Shakya所说.仅在可以动态设置亮度的系统(笔记本电脑和某些多合一设备)中，才可以通过WMI更改亮度.
As Amit Shakya has stated. changing the brightness throught WMI is only possible in systems that can dynamically set the brightness (laptops and some some all-in-one devices).
但是，有一项Microsoft功能可以让您更改外部显示器SetMonitorBrightness的亮度.
However, there is a Microsoft function that allows you to change the brightness of an external monitor, SetMonitorBrightness.
请参见 Microsoft库
我附上一个简单的示例:
I attach a simple example of how to do it:
// 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);
}
}
这篇关于使用WMI更改亮度的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
