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Code  ›  c#配合c++调节屏幕亮度，非伽马以及RGB方案_c#调节屏幕亮度_NightPoetry的博客
https://blog.csdn.net/u011471253/article/details/114170009
粗眉毛的薯片
2 年前

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.net/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.com/en-us/library/windows/desktop/aa372703%28v=vs.85%29.aspx
	* char* 和 wchar_t* 互相转换参考博客
	* https://www.cnblogs.com/icqw/p/4614877.html
	* c++代码参考博客
	* https://blog.csdn.net/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.com/en-us/library/windows/desktop/aa372703%28v=vs.85%29.aspx
	* char* 和 wchar_t* 互相转换参考博客
	* https://www.cnblogs.com/icqw/p/4614877.html
	* c++代码参考博客
	* https://blog.csdn.net/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.net/download/u011471253/15500112
 

c++版：https://download.csdn.net/download/u011471253/15500113
 
                    #define _CRT_SECURE_NO_WARNINGS#include &lt;stdio.h&gt;#include &lt;stdlib.h&gt;#include &lt;windows.h&gt;#include &lt;iostream&gt;#include &lt;Ntddvdeo.h&gt;using namespace std;#define IOCTL_VIDEO_QUERY_SUPPORTED_BRIGHTNESS  CTL_CODE(FILE_DEVICE_.
				
C#读取和调节屏幕亮度，注意是亮度，不是对比度！
ObjectQuery query = new ObjectQuery("SELECT * FROM WmiMonitorBrightness");//读取
new Object[] { UInt32.MaxValue, targetBrightness });//设置

				
Github:https://github.com/CHNMaxGor/AjustScreenBrightness
方法一: 使用网上常说的 Gdi32.dll 下的 SetDeviceGammaRamp (修改系统Gamma)
DllImport("gdi32.dll")]
public static extern bool GetDeviceGammaRamp(In...

				
void gamma_correction(cv::Mat& src, cv::Mat& dst, float K) {
	uchar LUT[256];
	src.copyTo(dst);
	for (int i = 0; i < 256; i++) {
		//float f = (i + 0.5f) / 255;
		float f = i / 255.0;
		f = pow(f, K);
		//LUT[i] = cv::saturate_cast<uchar>.
 
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