Windows下提示顯示器信息主要通過兩個函數實現。一個是EnumDisplayDevices()， 另一個是EnumDisplayMonitors().
EnumDisplayDevices()枚舉所有顯示設備，而EnumDisplayMonitors枚舉的是所有顯示器。
顯示設備和顯示器不一樣，比如顯卡算顯示設備，但是不是顯示器。
EnumDisplayMonitors()還會枚舉出不可見的偽顯示器，如果只是想得到實際的顯示器數目的話可以用GetSystemMetrics(SM_CMONITORS)，該函數不包括虛擬顯示器。
MonitorInfoex 和MonitorInfo 在這兩個結構中保存著相應顯示器的相關信息,如坐標、是否為主顯示器等 GetMonitorInfo ( ) 　取得指定顯示器的相關信息,如物理顯示區大小等
MonitorFromPoint ( ) 　取得指定點所在的顯示器句柄
MonitorFromRect ( ) 　取得指定矩形所在的顯示器句柄
MonitorFromWindow( ) 　取得指定窗口所在的顯示器句柄
MonitorEnumProc( ) 當應用程序調用EnumDisplayMonitors ( )查詢顯示器個數時,系統自動為每一個顯示器調用一次該函數。應用程序可以依此判斷顯示器的個數、位置及顯示區域的大小等信息
函數名：MonitorEnumProc（）
輸入參數：HMONITOR hMonitor ---顯示器句柄
????????? HDC hdcMonitor? ----顯示器DC句柄
???? ?? LPRECT lprcMonitor-----
???? ?? LPARAM dwData-----EnumDisplayMonitors傳來的數據
返回：bool
功能：若返回為真，EnumDisplayMonitors繼續枚舉，
????? 若返回為假，EnumDisplayMonitors停止枚舉，從而獲得顯示器信息
MonitorAdapter.h #include <atlstr.h> #include <vector> #include <WinDef.h> #include <tchar.h> using std::vector;using namespace std;#define MAX_MONITOR_NAME 256static std::vector<HMONITOR> g_hMonitorGroup; // 顯示器模式信息 typedef struct MonitorModeInfo_t {unsigned int m_nWidth; unsigned int m_nHeight;MonitorModeInfo_t(int nWidth, int nHeight) : m_nWidth(nWidth), m_nHeight(nHeight) {} }MonitorModeInfo;// 顯示器信息 struct MonitorInfo {TCHAR szDevice[MAX_MONITOR_NAME]; // 顯示器名稱std::vector<MonitorModeInfo> m_vecModeInfo; // 當前名稱的顯示器支持的分辨率模式 };typedef std::vector<MonitorInfo> VEC_MONITORMODE_INFO; // 所有的顯示器信息 class MonitorAdapter { public:MonitorAdapter();~MonitorAdapter();// 回調函數static int CALLBACK MonitorEnumProc(HMONITOR hMonitor, HDC hdc,LPRECT lpRMonitor,LPARAM dwData);// 得到所有顯示器的名稱void GetAllMonitorName(VEC_MONITORMODE_INFO& m_vecMonitorListInfo);// 得到所有顯示器的模式void GetAllDisplayMode(VEC_MONITORMODE_INFO& m_vecMonitorListInfo);//得到屏幕當前分辨率void GetCurrentReselotion(int& nWidth,int& nHeight,int& nFreq,int& nBits);//根據屏幕ID取獲取屏幕的對應分辨率void GetCurrentReselotion(LPCWSTR lpszDeviceName, int& nWidth, int& nHeight, int& nFreq, int& nBits);//修改分辨率int ChangMonitorReselotion(HMONITOR hMonitor,const int nWidth,const int nHight,const int nFre,const int nColorBits); };
MonitorAdapter.cpp #include "stdafx.h" #include "MonitorAdapter.h"MonitorAdapter::MonitorAdapter(void) { }MonitorAdapter::~MonitorAdapter(void) { }int CALLBACK MonitorAdapter::MonitorEnumProc(HMONITOR hMonitor, HDC hdc,LPRECT lpRMonitor,LPARAM dwData) {g_hMonitorGroup.push_back(hMonitor);return 1; }// 得到所有顯示器的名稱 void MonitorAdapter::GetAllMonitorName(VEC_MONITORMODE_INFO& vecMonitorListInfo) {g_hMonitorGroup.clear();::EnumDisplayMonitors(NULL, NULL, MonitorEnumProc, 0);//vector<HMONITOR>::iterator ithMoniter = g_hMonitorGroup.begin();for(int i = 0; i < g_hMonitorGroup.size();i++){MONITORINFOEX mixTemp;memset(&mixTemp, 0, sizeof(MONITORINFOEX));mixTemp.cbSize = sizeof(MONITORINFOEX);GetMonitorInfo(g_hMonitorGroup[i], &mixTemp);VEC_MONITORMODE_INFO::iterator itBeg = vecMonitorListInfo.begin();VEC_MONITORMODE_INFO::iterator itEnd = vecMonitorListInfo.end();for(; itBeg != itEnd; ++itBeg){if( 0 == _tcscmp(mixTemp.szDevice, itBeg->szDevice)){break;}}//沒有在列表中找到,則需要添加if (itBeg == itEnd) {MonitorInfo tmpMonitorInfo;_tcscpy_s(tmpMonitorInfo.szDevice, sizeof(tmpMonitorInfo.szDevice), mixTemp.szDevice);vecMonitorListInfo.push_back(tmpMonitorInfo);}} }// 得到所有顯示器的模式 void MonitorAdapter::GetAllDisplayMode(VEC_MONITORMODE_INFO& vecMonitorListInfo) {GetAllMonitorName(vecMonitorListInfo);bool bRetVal;DEVMODE devmode;VEC_MONITORMODE_INFO::iterator itBeg = vecMonitorListInfo.begin();VEC_MONITORMODE_INFO::iterator itEnd = vecMonitorListInfo.end();for (NULL; itBeg != itEnd; ++itBeg){int iMode = 0;do{bRetVal = ::EnumDisplaySettings(itBeg->szDevice, iMode, &devmode);iMode++;if (bRetVal){bool bFind = false;vector<MonitorModeInfo>::iterator itBeg_Mode = itBeg->m_vecModeInfo.begin();vector<MonitorModeInfo>::iterator itEnd_Mode = itBeg->m_vecModeInfo.end();for (NULL; itBeg_Mode != itEnd_Mode; ++itBeg_Mode){// 如果已經在列表中找到,則結束本次循環if ((itBeg_Mode->m_nWidth == devmode.dmPelsWidth) && (itBeg_Mode->m_nHeight == devmode.dmPelsHeight)){bFind = true;break;}// 插入數據時,從 大到小排列 (按windows 分辨率設置,優先比較 寬) if ((itBeg_Mode->m_nWidth < devmode.dmPelsWidth) ||((itBeg_Mode->m_nWidth == devmode.dmPelsWidth) && (itBeg_Mode->m_nHeight < devmode.dmPelsHeight))){ break;}}if(!bFind){if (itBeg_Mode == itEnd_Mode){itBeg->m_vecModeInfo.push_back(MonitorModeInfo(devmode.dmPelsWidth, devmode.dmPelsHeight)); }else{itBeg->m_vecModeInfo.insert(itBeg_Mode, MonitorModeInfo(devmode.dmPelsWidth, devmode.dmPelsHeight)); }}}}while (bRetVal); } }int MonitorAdapter::ChangMonitorReselotion(HMONITOR hMonitor,const int nWidth,const int nHight,const int nFre,const int nColorBits) {if ( NULL == hMonitor ){return -1;}MONITORINFOEX mi;mi.cbSize = sizeof(mi);GetMonitorInfo( hMonitor , &mi);DEVMODE DeviceMode;ZeroMemory(&DeviceMode, sizeof(DEVMODE));DeviceMode.dmSize = sizeof(DEVMODE); BOOL bFlag = TRUE;bFlag = EnumDisplaySettings(mi.szDevice, ENUM_CURRENT_SETTINGS, &DeviceMode);if ( bFlag != TRUE ){return -1;} if (DeviceMode.dmPelsWidth == nWidth && DeviceMode.dmPelsHeight == nHight ){return 0;}DeviceMode.dmDisplayFlags = 0;DeviceMode.dmPelsWidth= nWidth; DeviceMode.dmPelsHeight = nHight;DeviceMode.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL | DM_DISPLAYFREQUENCY ;int nRet = ChangeDisplaySettingsEx(mi.szDevice, &DeviceMode, NULL, CDS_GLOBAL | CDS_NORESET | CDS_UPDATEREGISTRY, NULL);if (DISP_CHANGE_BADMODE == nRet){ChangeDisplaySettingsEx(mi.szDevice, &DeviceMode, NULL, CDS_GLOBAL | CDS_NORESET | CDS_UPDATEREGISTRY, NULL); }if ( DISP_CHANGE_SUCCESSFUL == nRet ){return 0;}return -1; }void MonitorAdapter::GetCurrentReselotion(int& nWidth,int& nHeight,int& nFreq,int& nBits) {DEVMODE DeviceMode;EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &DeviceMode);nWidth = DeviceMode.dmPelsWidth;nHeight = DeviceMode.dmPelsHeight;nFreq = DeviceMode.dmDisplayFrequency;nBits = DeviceMode.dmBitsPerPel; }void MonitorAdapter::GetCurrentReselotion(LPCWSTR lpszDeviceName, int& nWidth, int& nHeight, int& nFreq, int& nBits) {DEVMODE DeviceMode;EnumDisplaySettings(lpszDeviceName, ENUM_CURRENT_SETTINGS, &DeviceMode);nWidth = DeviceMode.dmPelsWidth;nHeight = DeviceMode.dmPelsHeight;nFreq = DeviceMode.dmDisplayFrequency;nBits = DeviceMode.dmBitsPerPel; }
test #include "stdafx.h" #include "MonitorAdapter.h"int _tmain(int argc, _TCHAR* argv[]) {MonitorAdapter m_monitorAdapter; //顯示器VEC_MONITORMODE_INFO vecMointorListInfo;m_monitorAdapter.GetAllDisplayMode(vecMointorListInfo);int nWidth = 0, nHeight = 0, nFreq = 0, nBits = 0;VEC_MONITORMODE_INFO::iterator itBeg = vecMointorListInfo.begin();for (int i = 0; i < vecMointorListInfo.size();i++){//得到當前顯示器分辨率 刷新率 色位m_monitorAdapter.GetCurrentReselotion(itBeg->szDevice, nWidth, nHeight, nFreq, nBits);itBeg++;nWidth = 0, nHeight = 0, nFreq = 0, nBits = 0;}return 0; }

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