显示器物理尺寸EDID数据获取

/******************************************************************** created: 2016/01/21 created: 21:1:2016 15:27 file base: XDisplayDevice file ext: h author: zhangweifang purpose: 显示设备相关API *********************************************************************/ #include "XDisplayDevice.h" #include <tchar.h> ////////////////////////////////////////////////////////////////////////// // 获取当前正在使用的Monitor BOOL XDD_GetActiveAttachedMonitor( OUT DISPLAY_DEVICE &ddMonitor // 输出ddMonitor信息 ) { // 初始化输出参数 ZeroMemory(&ddMonitor, sizeof(ddMonitor)); // 枚举Adapter下Monitor用变量 DWORD dwMonitorIndex = 0; DISPLAY_DEVICE ddMonTmp; // 枚举Adapter DWORD dwAdapterIndex = 0; DISPLAY_DEVICE ddAdapter; ddAdapter.cb = sizeof(ddAdapter); while (::EnumDisplayDevices(0, dwAdapterIndex, &ddAdapter, 0) != FALSE) { // 枚举该Adapter下的Monitor dwMonitorIndex = 0; ZeroMemory(&ddMonTmp, sizeof(ddMonTmp)); ddMonTmp.cb = sizeof(ddMonTmp); while (::EnumDisplayDevices(ddAdapter.DeviceName, dwMonitorIndex, &ddMonTmp, 0) != FALSE) { // 判断状态是否正确 if ( (ddMonTmp.StateFlags & DISPLAY_DEVICE_ACTIVE) == DISPLAY_DEVICE_ACTIVE && (ddMonTmp.StateFlags & DISPLAY_DEVICE_ATTACHED) == DISPLAY_DEVICE_ATTACHED ) { ddMonitor = ddMonTmp; return TRUE; } // 下一个Monitor dwMonitorIndex += 1; ZeroMemory(&ddMonTmp, sizeof(ddMonTmp)); ddMonTmp.cb = sizeof(ddMonTmp); } // 下一个Adapter dwAdapterIndex += 1; ZeroMemory(&ddAdapter, sizeof(ddAdapter)); ddAdapter.cb = sizeof(ddAdapter); } // 未枚举到满足条件的Monitor return FALSE; } // 解析DeviceID得到LEN0028以及{4d36e96e-e325-11ce-bfc1-08002be10318}\0001 // DeviceID:MONITOR\LEN0028\{4d36e96e-e325-11ce-bfc1-08002be10318}\0001 BOOL XDD_GetModelDriverFromDeviceID( IN LPCWSTR lpDeviceID, // DeviceID OUT wstring &strModel, // 输出型号，比如LEN0028 OUT wstring &strDriver // 输出驱动信息，比如{4d36e96e-e325-11ce-bfc1-08002be10318}\0001 ) { // 初始化输出参数 strModel = L""; strDriver = L""; // 参数有效性 if (lpDeviceID == NULL) { return FALSE; } // 查找第一个斜杠后的开始位置 LPCWSTR lpBegin = wcschr(lpDeviceID, L'\\'); if (lpBegin == NULL) { return FALSE; } lpBegin += 1; // 查找开始后的第一个斜杠 LPCWSTR lpSlash = wcschr(lpBegin, L'\\'); if (lpSlash == NULL) { return FALSE; } // 得到Model，最长为7个字符 wchar_t wcModelBuf[8] = {0}; size_t szLen = lpSlash - lpBegin; if (szLen >= 8) { szLen = 7; } wcsncpy_s(wcModelBuf, lpBegin, szLen); // 得到输出参数 strModel = wstring(wcModelBuf); strDriver = wstring(lpSlash + 1); // 解析成功 return TRUE; } // 根据Model判断EDID数据是否正确 BOOL XDD_IsCorrectEDID( IN const BYTE *pEDIDBuf, // EDID数据缓冲区 IN DWORD dwcbBufSize, // 数据字节大小 IN LPCWSTR lpModel // 型号 ) { // 参数有效性 if (pEDIDBuf==NULL || dwcbBufSize<24 || lpModel==NULL) { return FALSE; } // 判断EDID头 if ( pEDIDBuf[0] != 0x00 || pEDIDBuf[1] != 0xFF || pEDIDBuf[2] != 0xFF || pEDIDBuf[3] != 0xFF || pEDIDBuf[4] != 0xFF || pEDIDBuf[5] != 0xFF || pEDIDBuf[6] != 0xFF || pEDIDBuf[7] != 0x00 ) { return FALSE; } // 厂商名称 2个字节 可表三个大写英文字母 // 每个字母有5位 共15位不足一位 在第一个字母代码最高位补 0” 字母 A”至 Z”对应的代码为00001至11010 // 例如 MAG”三个字母 M代码为01101 A代码为00001 G代码为00111 在M代码前补0为001101 // 自左向右排列得2字节 001101 00001 00111 转化为十六进制数即为34 27 DWORD dwPos = 8; wchar_t wcModelBuf[9] = {0}; char byte1 = pEDIDBuf[dwPos]; char byte2 = pEDIDBuf[dwPos+1]; wcModelBuf[0]=((byte1 & 0x7C) >> 2) + 64; wcModelBuf[1]=((byte1 & 3) << 3) + ((byte2 & 0xE0) >> 5) + 64; wcModelBuf[2]=(byte2 & 0x1F) + 64; swprintf_s(wcModelBuf+3, sizeof(wcModelBuf)/sizeof(wchar_t)-3, L"%X%X%X%X", (pEDIDBuf[dwPos+3] & 0xf0) >> 4, pEDIDBuf[dwPos+3] & 0xf, (pEDIDBuf[dwPos+2] & 0xf0) >> 4, pEDIDBuf[dwPos+2] & 0x0f); // 比较MODEL是否匹配 return (_wcsicmp(wcModelBuf, lpModel)==0) ? TRUE : FALSE; } // 根据Model及Driver信息取得EDID数据 BOOL XDD_GetDeviceEDID( IN LPCWSTR lpModel, // 型号 IN LPCWSTR lpDriver, // Driver OUT BYTE *pDataBuf, // 输出EDID数据缓冲区 IN DWORD dwcbBufSize, // 输出缓冲区字节大小，不可小于256 OUT DWORD *pdwGetBytes // 实际获得字节数 ) { // 初始化输出参数 if (pdwGetBytes != NULL) { *pdwGetBytes = 0; } // 参数有效性 if ( lpModel == NULL || lpDriver == NULL || pDataBuf == NULL || dwcbBufSize == 0 ) { return FALSE; } // 打开设备注册表子键 wchar_t wcSubKey[MAX_PATH] = L"SYSTEM\\CurrentControlSet\\Enum\\DISPLAY\\"; wcscat_s(wcSubKey, lpModel); HKEY hSubKey; if(::RegOpenKeyEx(HKEY_LOCAL_MACHINE, wcSubKey, 0, KEY_READ, &hSubKey) != ERROR_SUCCESS) { return FALSE; } // 存放EDID数据 BOOL bGetEDIDSuccess = FALSE; BYTE EDIDBuf[256] = {0}; DWORD dwEDIDSize = sizeof(EDIDBuf); // 枚举该子键下的键 DWORD dwIndex = 0; DWORD dwSubKeyLen = sizeof(wcSubKey) / sizeof(wchar_t); FILETIME ft; while( bGetEDIDSuccess == FALSE && ::RegEnumKeyEx(hSubKey, dwIndex, wcSubKey, &dwSubKeyLen, NULL, NULL, NULL, &ft) == ERROR_SUCCESS ) { // 打开枚举到的键 HKEY hEnumKey; if (::RegOpenKeyEx(hSubKey, wcSubKey, 0, KEY_READ, &hEnumKey) == ERROR_SUCCESS) { // 打开的键下查询Driver键的值 dwSubKeyLen = sizeof(wcSubKey) / sizeof(wchar_t); if( ::RegQueryValueEx(hEnumKey, L"Driver", NULL, NULL, (LPBYTE)&wcSubKey, &dwSubKeyLen) == ERROR_SUCCESS && _wcsicmp(wcSubKey, lpDriver) == 0 // Driver匹配 ) { // 打开键Device Parameters HKEY hDevParaKey; if(::RegOpenKeyEx(hEnumKey, L"Device Parameters", 0, KEY_READ, &hDevParaKey) == ERROR_SUCCESS) { // 读取EDID memset(EDIDBuf, 0, sizeof(EDIDBuf)); dwEDIDSize = sizeof(EDIDBuf); if( ::RegQueryValueEx(hDevParaKey, L"EDID", NULL, NULL, (LPBYTE)&EDIDBuf, &dwEDIDSize) == ERROR_SUCCESS && XDD_IsCorrectEDID(EDIDBuf, dwEDIDSize, lpModel) == TRUE // 正确的EDID数据 ) { // 得到输出参数 DWORD dwRealGetBytes = min(dwEDIDSize, dwcbBufSize); if (pdwGetBytes != NULL) { *pdwGetBytes = dwRealGetBytes; } memcpy(pDataBuf, EDIDBuf, dwRealGetBytes); // 成功获取EDID数据 bGetEDIDSuccess = TRUE; } // 关闭键Device Parameters ::RegCloseKey(hDevParaKey); } } // 关闭枚举到的键 ::RegCloseKey(hEnumKey); } // 下一个子键 dwIndex += 1; } // 关闭设备注册表子键 ::RegCloseKey(hSubKey); // 返回获取EDID数据结果 return bGetEDIDSuccess; } // 获取当前Monitor的物理尺寸，单位CM BOOL XDD_GetActiveMonitorPhysicalSize( OUT DWORD &dwWidth, // 输出宽度，单位CM OUT DWORD &dwHeight // 输出高度，单位CM ) { // 初始化输出参数 dwWidth = 0; dwHeight = 0; // 取得当前Monitor的DISPLAY_DEVICE数据 DISPLAY_DEVICE ddMonitor; if (XDD_GetActiveAttachedMonitor(ddMonitor) == FALSE) { return FALSE; } // 解析DeviceID得到Model和Driver wstring strModel = L""; wstring strDriver = L""; if (XDD_GetModelDriverFromDeviceID(ddMonitor.DeviceID, strModel, strDriver) == FALSE) { return FALSE; } // 取得设备EDID数据 BYTE EDIDBuf[256] = {0}; DWORD dwRealGetBytes = 0; if ( XDD_GetDeviceEDID(strModel.c_str(), strDriver.c_str(), EDIDBuf, sizeof(EDIDBuf), &dwRealGetBytes) == FALSE || dwRealGetBytes < 23 ) { return FALSE; } // EDID结构中第22和23个字节为宽度和高度 dwWidth = EDIDBuf[21]; dwHeight = EDIDBuf[2