获取 WinCE 移动设备屏幕旋转方向，分别从系统提供的接口和注册表获取。如果都获取不到，则采用默认值。
1 #ifndef DMDO_ZERO 2 #define DMDO_ZERO 0 3 #endif 4 #ifndef DMDO_90 5 #define DMDO_90 1 6 #endif 7 #ifndef DMDO_180 8 #define DMDO_180 2 9 #endif 10 #ifndef DMDO_270 11 #define DMDO_270 4 12 #endif 13 14 //direction flags 15 #define DIR_SWAPXY 0x001 16 #define DIR_MIRRORLEFTRIGHT 0x002 17 #define DIR_MIRRORUPDOWN 0x004 18 19 static int giOrientation = -1; 20 21 #define TARGET_WINCE 22 int GetOrientation() 23 { 24 #if defined(TARGET_WINCE) 25 if(giOrientation < 0) 26 { 27 HKEY Key; 28 // context *p = NULL; 29 char Buffer[256]; 30 DEVMODE *Mode = (DEVMODE *)Buffer; // 一个比较复杂的结构体, 定义请参看 MSDN 31 32 Mode->dmSize = 192; 33 Mode->dmFields = 0x01000000L; 34 35 36 static LONG (WINAPI *FuncChangeDisplaySettingsEx)(LPCTSTR,LPDEVMODE,HWND,DWORD,LPVOID) = NULL; 37 38 HINSTANCE CoreDLL = LoadLibrary(_T("coredll.dll")); 39 if (CoreDLL) 40 { 41 *(FARPROC *)&FuncChangeDisplaySettingsEx = GetProcAddress(CoreDLL,_T("ChangeDisplaySettingsEx")); 42 } 43 44 if(FuncChangeDisplaySettingsEx && 45 0 == FuncChangeDisplaySettingsEx(NULL, Mode, NULL, CDS_TEST, NULL)) 46 { 47 Mode->dmFields = 0x00800000L; 48 FuncChangeDisplaySettingsEx(NULL, Mode, NULL, CDS_TEST, NULL); 49 50 switch((&Mode->dmDisplayFrequency)[1]) //(Mode->dmDisplayOrientation) 51 { 52 case DMDO_ZERO: 53 giOrientation = 0; 54 break; 55 case DMDO_90: 56 giOrientation = DIR_SWAPXY | DIR_MIRRORUPDOWN; 57 break; 58 case DMDO_270: 59 giOrientation = DIR_SWAPXY | DIR_MIRRORLEFTRIGHT; 60 break; 61 case DMDO_180: 62 giOrientation = DIR_MIRRORUPDOWN | DIR_MIRRORLEFTRIGHT; 63 break; 64 default: 65 // giOrientation = 0; 66 break; 67 } 68 } 69 70 if(giOrientation < 0 && ERROR_SUCCESS == RegOpenKeyEx(HKEY_LOCAL_MACHINE, _T("System\GDI\ROTATION"), 0, KEY_READ, &Key)) 71 { 72 DWORD dwValue; 73 DWORD dwRegSize = sizeof(dwValue); 74 DWORD dwRegType; 75 76 if(ERROR_SUCCESS == RegQueryValueEx(Key, _T("Angle"), 0, &dwRegType, (LPBYTE) &dwValue, &dwRegSize)) 77 { 78 switch(dwValue) 79 { 80 case 0: 81 giOrientation = 0; 82 break; 83 case 90: 84 giOrientation = DIR_SWAPXY | DIR_MIRRORUPDOWN; 85 break; 86 case 270: 87 giOrientation = DIR_SWAPXY | DIR_MIRRORLEFTRIGHT; 88 break; 89 case 180: 90 giOrientation = DIR_MIRRORUPDOWN | DIR_MIRRORLEFTRIGHT; 91 break; 92 default: 93 // giOrientation = 0; 94 break; 95 } 96 } 97 98 RegCloseKey(Key); 99 } 100 101 if(giOrientation < 0) 102 giOrientation = 0; 103 } 104 #else 105 giOrientation = 0; 106 #endif 107 108 RETAILMSG(1,(L"[%s]Orientation: %d ",CString(__FUNCTION__),giOrientation)); // [GetOrientation]Orientation: 0 109 return giOrientation; 110 }