标签:als ace white library public hat false target written
出处:http://www.nirsoft.net/vc/change_screen_brightness.html
SetDeviceGammaRamp API函数位于Gdi32.ll中,接收一个256*3 RGB值的数组。
增加这个数组中的值会使屏幕更亮,而减少这些值会使屏幕变暗。
可以通过增加或减少的红/绿/蓝成分的值来显示影响。例如:在所有RGB值中增加蓝色分量将增加整个显示的蓝色。
下面的类封装调用GetDeviceGammaRamp和SetDeviceGammaRamp,并设置屏幕的亮度,提供setbrightness功能。
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#ifndef GAMMARAMP_H_
#define GAMMARAMP_H_ /* CGammaRamp class Encapsulates the Gamma Ramp API and changes the brightness of the entire screen. Written by Nir Sofer. http://www.nirsoft.net */ class CGammaRamp { protected: HMODULE hGDI32; HDC hScreenDC; typedef BOOL (WINAPI *Type_GetDeviceGammaRamp)(HDC hDC, LPVOID lpRamp); typedef BOOL (WINAPI *Type_SetDeviceGammaRamp)(HDC hDC, LPVOID lpRamp); Type_GetDeviceGammaRamp pGetDeviceGammaRamp; Type_SetDeviceGammaRamp pSetDeviceGammaRamp; public: CGammaRamp(); ~CGammaRamp(); BOOL LoadLibrary(); void FreeLibrary(); BOOL LoadLibraryIfNeeded(); BOOL SetDeviceGammaRamp(HDC hDC, LPVOID lpRamp); BOOL GetDeviceGammaRamp(HDC hDC, LPVOID lpRamp); BOOL SetBrightness(HDC hDC, WORD wBrightness); }; #endif//#ifndef GAMMARAMP_H_ |
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#include <windows.h>
#include "gammaramp.h" /* CGammaRamp class Encapsulates the Gamma Ramp API and changes the brightness of the entire screen. Written by Nir Sofer. http://www.nirsoft.net */ CGammaRamp::CGammaRamp() { //Initialize all variables. hGDI32 = NULL; hScreenDC = NULL; pGetDeviceGammaRamp = NULL; pSetDeviceGammaRamp = NULL; } CGammaRamp::~CGammaRamp() { FreeLibrary(); } BOOL CGammaRamp::LoadLibrary() { BOOL bReturn = FALSE; FreeLibrary(); //Load the GDI library. hGDI32 = ::LoadLibrary("gdi32.dll"); if (hGDI32 != NULL) { //Get the addresses of GetDeviceGammaRamp and SetDeviceGammaRamp API functions. pGetDeviceGammaRamp = (Type_GetDeviceGammaRamp)GetProcAddress(hGDI32, "GetDeviceGammaRamp"); pSetDeviceGammaRamp = (Type_SetDeviceGammaRamp)GetProcAddress(hGDI32, "SetDeviceGammaRamp"); //Return TRUE only if these functions exist. if (pGetDeviceGammaRamp == NULL || pSetDeviceGammaRamp == NULL) { FreeLibrary(); } else { bReturn = TRUE; } } return bReturn; } void CGammaRamp::FreeLibrary() { //Free the GDI library. if (hGDI32 != NULL) { ::FreeLibrary(hGDI32); hGDI32 = NULL; } } BOOL CGammaRamp::LoadLibraryIfNeeded() { BOOL bReturn = FALSE; if (hGDI32 == NULL) { LoadLibrary(); } if (pGetDeviceGammaRamp != NULL && pSetDeviceGammaRamp != NULL) { bReturn = TRUE; } return bReturn; } BOOL CGammaRamp::SetDeviceGammaRamp(HDC hDC, LPVOID lpRamp) { //Call to SetDeviceGammaRamp only if this function is successfully loaded. if (LoadLibraryIfNeeded()) { return pSetDeviceGammaRamp(hDC, lpRamp); } else { return FALSE; } } BOOL CGammaRamp::GetDeviceGammaRamp(HDC hDC, LPVOID lpRamp) { //Call to GetDeviceGammaRamp only if this function is successfully loaded. if (LoadLibraryIfNeeded()) { return pGetDeviceGammaRamp(hDC, lpRamp); } else { return FALSE; } } BOOL CGammaRamp::SetBrightness(HDC hDC, WORD wBrightness) { /* Changes the brightness of the entire screen. This function may not work properly in some video cards. The wBrightness value should be a number between 0 and 255. 128 = Regular brightness above 128 = brighter below 128 = darker If hDC is NULL, SetBrightness automatically load and release the display device context for you. */ BOOL bReturn = FALSE; HDC hGammaDC = hDC; //Load the display device context of the entire screen if hDC is NULL. if (hDC == NULL) hGammaDC = GetDC(NULL); if (hGammaDC != NULL) { //Generate the 256-colors array for the specified wBrightness value. WORD GammaArray[3][256]; for (int iIndex = 0; iIndex < 256; iIndex++) { int iArrayValue = iIndex * (wBrightness + 128); if (iArrayValue > 65535) { iArrayValue = 65535; } GammaArray[0][iIndex] = GammaArray[1][iIndex] = GammaArray[2][iIndex] = (WORD)iArrayValue; } //Set the GammaArray values into the display device context. bReturn = SetDeviceGammaRamp(hGammaDC, GammaArray); } if (hDC == NULL) { ReleaseDC(NULL, hGammaDC); } return bReturn; } |
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#include <Windows.h>
#include "gammaramp.h" int WINAPI WinMain( HINSTANCE hInstance, // handle to current instance HINSTANCE hPrevInstance, // handle to previous instance LPSTR lpCmdLine, // command line int nCmdShow // show state ) { //Example for changing the brightness with CGammaRamp class: //Be aware that this exmaple may not work properly in all Video cards. CGammaRamp GammaRamp; //Make the screen darker: GammaRamp.SetBrightness(NULL, 64); //Wait 3 seconds: Sleep(3000); //Return back to normal: GammaRamp.SetBrightness(NULL, 128); return 0; } |
VC++调节显示器的亮度SetDeviceGammaRamp
标签:als ace white library public hat false target written
原文地址:http://www.cnblogs.com/MakeView660/p/7773094.html