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文章开头感谢国内唯一（搜索前几页能找到的）完善了背光调节API资料的独苗 ：https://blog.csdn/weixin_34111819/article/details/86328019
PS：他代码的主干对了，细节处有很多相对于VS的错误，毕竟是DEV写的，这样很难用作工程。
#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <iostream>
#include <Ntddvdeo.h>
using namespace std;
#define IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x125, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x126, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x127, METHOD_BUFFERED, FILE_ANY_ACCESS)
int setBrightness(int level)
{
HANDLE h;
DWORD nOutBufferSize = 256;
BYTE SupportedBrightness[256];
DWORD g_supportedLevelCount;
DISPLAY_BRIGHTNESS DisplayBrightness;
memset(SupportedBrightness, 0, sizeof(SupportedBrightness));
/* use createfile function to open lcd.
* url from microsoft about IOCTL code.
* http://msdn.microsoft/en-us/library/windows/desktop/aa372703%28v=vs.85%29.aspx
*/
/*
* char* 和 wchar_t* 互相转换参考博客
* https://wwwblogs/icqw/p/4614877.html
*/
/*
* c++代码参考博客
* https://blog.csdn/weixin_34111819/article/details/86328019
*/
char temchar[] = "\\\\.\\LCD";
char* szSour = temchar;
WCHAR Temp[128] = { 0 };
mbstowcs(Temp, szSour, strlen(szSour));
h = CreateFile(Temp, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0);
if (h == INVALID_HANDLE_VALUE) {
printf("Open \\\\.\\LCD error");
exit(1);
}
/* Query for display supported level */
if (!DeviceIoControl(h, IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS, NULL, 0, SupportedBrightness, nOutBufferSize, &g_supportedLevelCount, NULL)) {
printf("IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS error - %d, - buffer: %d ", g_supportedLevelCount, nOutBufferSize);
exit(1);
}
if (g_supportedLevelCount == 0) /* 0 means not supported */
{
printf("\nLCD not support LEVEL COUNT", g_supportedLevelCount);
exit(1);
}
DisplayBrightness.ucDisplayPolicy = 0;
DisplayBrightness.ucACBrightness = level;
DisplayBrightness.ucDCBrightness = level;
/* Set display backlight level */
nOutBufferSize = sizeof(DisplayBrightness);
if (!DeviceIoControl(h, IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS, (DISPLAY_BRIGHTNESS*)&DisplayBrightness, nOutBufferSize, NULL, 0, &nOutBufferSize, NULL)) {
printf("IOCTL_VIDEO_SET_SUPPORTED_BRIGHTNESS error - %d, - buffer: %d ", g_supportedLevelCount, nOutBufferSize);
exit(1);
}
Sleep(500); /* delay for some time while wmi event changed */
nOutBufferSize = sizeof(DisplayBrightness);
if (!DeviceIoControl(h, IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS, NULL, 0, (DISPLAY_BRIGHTNESS*)&DisplayBrightness, nOutBufferSize, &nOutBufferSize, NULL)) {
printf("IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS error - %d, - buffer: %d ", g_supportedLevelCount, nOutBufferSize);
exit(1);
}
printf("\nBrightness_AC: %d\nBrightness_DC: %d", DisplayBrightness.ucACBrightness, DisplayBrightness.ucDCBrightness);
}
int main() {
int a;
cin >> a;
setBrightness(a);
return 0;
}编译环境是VS，众所周知VS对代码的要求相对严格。所以这位大佬的代码有些部分需要修改。在这里我会指出修改地方以及对修改的部分进行解释。
首先#include <Ntddvdeo.h>直接引用就可以了不要加前缀，VS会自动寻找这个头文件的。
char temchar[] = "\\\\.\\LCD";
char* szSour = temchar;
WCHAR Temp[128] = { 0 };
mbstowcs(Temp, szSour, strlen(szSour));
h = CreateFile(Temp, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0);其次这里的Temp参数，之前大佬的写法是直接“\\\\.\\LCD”，但是这个参数的位置是填到一个WCHAR类型的参数，所以我们要对其进行转换。在转换的过程中VS不允许使用char*指针指向一个字符串常量，所以我们要先将这个字符串常量赋值给一个字符数组，然后再用指针指向它就行了。转换的方法在另一位大佬的博客中，我在代码中已经作为注释给出地址了（感谢各个前辈们做出的贡献）。
最后我要注明一下，这个int setBrightness(int level)中的level的范围是0到100，虽然大多数情况下调到0也能看清，但是万一呢是吧，最好测试的时候别调到零。
上面的是c++代码现在让我们来做成c#模块。（这个模块文末我会放出连接，有百度云和CSDN两个连接，还有gitHub有全部的源代码）我们的思路是将C++编译成DLL模块，然后由c#引用，并在C#中封装成模块的方式来供C#调用。
下面是c++封装DLL的教程（正在准备材料，还没写完，先存着）
建立DLL工程之后对工程稍作修改，改动如下：
将这一句删掉，因为我们要用到这些极少用的内容。
然后将dllmain.cpp的内容改为如下内容
// dllmain.cpp : 定义 DLL 应用程序的入口点。
#define _CRT_SECURE_NO_WARNINGS
#include "pch.h"
#include <stdio.h>
#include <stdlib.h>
#include <windows.h>
#include <iostream>
#include <Ntddvdeo.h>
BOOL APIENTRY DllMain(HMODULE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}
#define IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x125, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x126, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS CTL_CODE(FILE_DEVICE_VIDEO, 0x127, METHOD_BUFFERED, FILE_ANY_ACCESS)
extern "C" _declspec(dllexport) void setBrightness(int level)
{
HANDLE h;
DWORD nOutBufferSize = 256;
BYTE SupportedBrightness[256];
DWORD g_supportedLevelCount;
DISPLAY_BRIGHTNESS DisplayBrightness;
memset(SupportedBrightness, 0, sizeof(SupportedBrightness));
/* use createfile function to open lcd.
* url from microsoft about IOCTL code.
* http://msdn.microsoft/en-us/library/windows/desktop/aa372703%28v=vs.85%29.aspx
*/
/*
* char* 和 wchar_t* 互相转换参考博客
* https://wwwblogs/icqw/p/4614877.html
*/
/*
* c++代码参考博客
* https://blog.csdn/weixin_34111819/article/details/86328019
*/
char temchar[] = "\\\\.\\LCD";
char* szSour = temchar;
WCHAR Temp[128] = { 0 };
mbstowcs(Temp, szSour, strlen(szSour));
h = CreateFile(Temp, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, 0, 0);
if (h == INVALID_HANDLE_VALUE) {
printf("Open \\\\.\\LCD error");
exit(1);
}
/* Query for display supported level */
if (!DeviceIoControl(h, IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS, NULL, 0, SupportedBrightness, nOutBufferSize, &g_supportedLevelCount, NULL)) {
printf("IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS error - %d, - buffer: %d ", g_supportedLevelCount, nOutBufferSize);
exit(1);
}
if (g_supportedLevelCount == 0) /* 0 means not supported */
{
printf("\nLCD not support LEVEL COUNT", g_supportedLevelCount);
exit(1);
}
DisplayBrightness.ucDisplayPolicy = 0;
DisplayBrightness.ucACBrightness = level;
DisplayBrightness.ucDCBrightness = level;
/* Set display backlight level */
nOutBufferSize = sizeof(DisplayBrightness);
if (!DeviceIoControl(h, IOCTL_VIDEO_SET_DISPLAY_BRIGHTNESS, (DISPLAY_BRIGHTNESS*)&DisplayBrightness, nOutBufferSize, NULL, 0, &nOutBufferSize, NULL)) {
printf("IOCTL_VIDEO_SET_SUPPORTED_BRIGHTNESS error - %d, - buffer: %d ", g_supportedLevelCount, nOutBufferSize);
exit(1);
}
Sleep(500); /* delay for some time while wmi event changed */
nOutBufferSize = sizeof(DisplayBrightness);
if (!DeviceIoControl(h, IOCTL_VIDEO_QUERY_DISPLAY_BRIGHTNESS, NULL, 0, (DISPLAY_BRIGHTNESS*)&DisplayBrightness, nOutBufferSize, &nOutBufferSize, NULL)) {
printf("IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS error - %d, - buffer: %d ", g_supportedLevelCount, nOutBufferSize);
exit(1);
}
printf("\nBrightness_AC: %d\nBrightness_DC: %d", DisplayBrightness.ucACBrightness, DisplayBrightness.ucDCBrightness);
}
注意这里作为c语言导出DLL是有必要的，否则导出后对外名字可能就改变了，不再是你声明的那个函数名了，会给后面的调用造成一定的困难。
extern "C" _declspec(dllexport) void setBrightness(int level)
//这里的C就是C语言形式导出的意思设置完成之后右键点击如下位置，然后选择生成解决方案。然后右键打开菜单之后选择“在资源管理器中打开”就能找到项目文件夹，然后找到debug文件夹，在文件夹下面就有dll文件，包括dll在内所有文件烤走就能用了。
完成之后开始创建C#版的DLL对c++的DLL进行二次封装
新建完成后，将DLL拖入项目资源，记住这里不能添加引用，非托管类型的DLL没法添加引用。
新建一个类，并填入如下代码
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
namespace BGLight
{
public class ChangeLight
{
[DllImport("BGLightChangeDLL.dll")]
public static extern void setBrightness(Int32 level);
public void Change(Int32 level)
{
setBrightness(level);
}
}
}
其中下面两句就是引入DLL的语句
[DllImport("BGLightChangeDLL.dll")]
public static extern void setBrightness(Int32 level);然后同样的步骤生成C#版的DLL。
得到c#版的DLL之后，在其他的c#工程只需要在工程中添加对DLL的引用并using相应的命名空间即可。
c#版：https://download.csdn/download/u011471253/15500112
c++版：https://download.csdn/download/u011471253/15500113
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