关于sendmessage控制摄像头消息
最近研究控制摄像头拍照...网上找到相关代码通过capCreateCaptureWindow和sendmessage来实现.
现在也能实现了...就是有点疑问,关于sendmessage中发送的消息..网上没找到相关的说明
Private Const WS_CHILD = &H40000000
Private Const WS_VISIBLE = &H10000000
Private Const WM_USER = &H400
Private Const WM_CAP_START = &H400
Private Const WM_CAP_STOP = WM_CAP_START + 68
Private Const WM_CAP_EDIT_COPY = (WM_CAP_START + 30)
Private Const WM_CAP_DRIVER_CONNECT = (WM_CAP_START + 10)
Private Const WM_CAP_SET_PREVIEWRATE = (WM_CAP_START + 52)
Private Const WM_CAP_SET_OVERLAY = (WM_CAP_START + 51)
以上这些是不是自定义的消息?为什么能控制摄像头?然后有没有控制摄像头所有的相关消息和他的功能说明...
[解决办法]
这是VC里的常数定义
#define WM_CAP_START WM_USER
// start of unicode messages
#define WM_CAP_UNICODE_START WM_USER+100
#define WM_CAP_GET_CAPSTREAMPTR (WM_CAP_START+ 1)
#define WM_CAP_SET_CALLBACK_ERRORW (WM_CAP_UNICODE_START+ 2)
#define WM_CAP_SET_CALLBACK_STATUSW (WM_CAP_UNICODE_START+ 3)
#define WM_CAP_SET_CALLBACK_ERRORA (WM_CAP_START+ 2)
#define WM_CAP_SET_CALLBACK_STATUSA (WM_CAP_START+ 3)
#ifdef UNICODE
#define WM_CAP_SET_CALLBACK_ERROR WM_CAP_SET_CALLBACK_ERRORW
#define WM_CAP_SET_CALLBACK_STATUS WM_CAP_SET_CALLBACK_STATUSW
#else
#define WM_CAP_SET_CALLBACK_ERROR WM_CAP_SET_CALLBACK_ERRORA
#define WM_CAP_SET_CALLBACK_STATUS WM_CAP_SET_CALLBACK_STATUSA
#endif
#define WM_CAP_SET_CALLBACK_YIELD (WM_CAP_START+ 4)
#define WM_CAP_SET_CALLBACK_FRAME (WM_CAP_START+ 5)
#define WM_CAP_SET_CALLBACK_VIDEOSTREAM (WM_CAP_START+ 6)
#define WM_CAP_SET_CALLBACK_WAVESTREAM (WM_CAP_START+ 7)
#define WM_CAP_GET_USER_DATA(WM_CAP_START+ 8)
#define WM_CAP_SET_USER_DATA(WM_CAP_START+ 9)
#define WM_CAP_DRIVER_CONNECT (WM_CAP_START+ 10)
#define WM_CAP_DRIVER_DISCONNECT (WM_CAP_START+ 11)
#define WM_CAP_DRIVER_GET_NAMEA (WM_CAP_START+ 12)
#define WM_CAP_DRIVER_GET_VERSIONA (WM_CAP_START+ 13)
#define WM_CAP_DRIVER_GET_NAMEW (WM_CAP_UNICODE_START+ 12)
#define WM_CAP_DRIVER_GET_VERSIONW (WM_CAP_UNICODE_START+ 13)
#ifdef UNICODE
#define WM_CAP_DRIVER_GET_NAME WM_CAP_DRIVER_GET_NAMEW
#define WM_CAP_DRIVER_GET_VERSION WM_CAP_DRIVER_GET_VERSIONW
#else
#define WM_CAP_DRIVER_GET_NAME WM_CAP_DRIVER_GET_NAMEA
#define WM_CAP_DRIVER_GET_VERSION WM_CAP_DRIVER_GET_VERSIONA
#endif
#define WM_CAP_DRIVER_GET_CAPS (WM_CAP_START+ 14)
#define WM_CAP_FILE_SET_CAPTURE_FILEA (WM_CAP_START+ 20)
#define WM_CAP_FILE_GET_CAPTURE_FILEA (WM_CAP_START+ 21)
#define WM_CAP_FILE_SAVEASA (WM_CAP_START+ 23)
#define WM_CAP_FILE_SAVEDIBA (WM_CAP_START+ 25)
#define WM_CAP_FILE_SET_CAPTURE_FILEW (WM_CAP_UNICODE_START+ 20)
#define WM_CAP_FILE_GET_CAPTURE_FILEW (WM_CAP_UNICODE_START+ 21)
#define WM_CAP_FILE_SAVEASW (WM_CAP_UNICODE_START+ 23)
#define WM_CAP_FILE_SAVEDIBW (WM_CAP_UNICODE_START+ 25)
#ifdef UNICODE
#define WM_CAP_FILE_SET_CAPTURE_FILE WM_CAP_FILE_SET_CAPTURE_FILEW
#define WM_CAP_FILE_GET_CAPTURE_FILE WM_CAP_FILE_GET_CAPTURE_FILEW
#define WM_CAP_FILE_SAVEAS WM_CAP_FILE_SAVEASW
#define WM_CAP_FILE_SAVEDIB WM_CAP_FILE_SAVEDIBW
#else
#define WM_CAP_FILE_SET_CAPTURE_FILE WM_CAP_FILE_SET_CAPTURE_FILEA
#define WM_CAP_FILE_GET_CAPTURE_FILE WM_CAP_FILE_GET_CAPTURE_FILEA
#define WM_CAP_FILE_SAVEAS WM_CAP_FILE_SAVEASA
#define WM_CAP_FILE_SAVEDIB WM_CAP_FILE_SAVEDIBA
#endif
// out of order to save on ifdefs
#define WM_CAP_FILE_ALLOCATE (WM_CAP_START+ 22)
#define WM_CAP_FILE_SET_INFOCHUNK (WM_CAP_START+ 24)
#define WM_CAP_EDIT_COPY (WM_CAP_START+ 30)
#define WM_CAP_SET_AUDIOFORMAT (WM_CAP_START+ 35)
#define WM_CAP_GET_AUDIOFORMAT (WM_CAP_START+ 36)
#define WM_CAP_DLG_VIDEOFORMAT (WM_CAP_START+ 41)
#define WM_CAP_DLG_VIDEOSOURCE (WM_CAP_START+ 42)
#define WM_CAP_DLG_VIDEODISPLAY (WM_CAP_START+ 43)
#define WM_CAP_GET_VIDEOFORMAT (WM_CAP_START+ 44)
#define WM_CAP_SET_VIDEOFORMAT (WM_CAP_START+ 45)
#define WM_CAP_DLG_VIDEOCOMPRESSION (WM_CAP_START+ 46)
#define WM_CAP_SET_PREVIEW (WM_CAP_START+ 50)
#define WM_CAP_SET_OVERLAY (WM_CAP_START+ 51)
#define WM_CAP_SET_PREVIEWRATE (WM_CAP_START+ 52)
#define WM_CAP_SET_SCALE (WM_CAP_START+ 53)
#define WM_CAP_GET_STATUS (WM_CAP_START+ 54)
#define WM_CAP_SET_SCROLL (WM_CAP_START+ 55)
#define WM_CAP_GRAB_FRAME (WM_CAP_START+ 60)
#define WM_CAP_GRAB_FRAME_NOSTOP (WM_CAP_START+ 61)
#define WM_CAP_SEQUENCE (WM_CAP_START+ 62)
#define WM_CAP_SEQUENCE_NOFILE (WM_CAP_START+ 63)
#define WM_CAP_SET_SEQUENCE_SETUP (WM_CAP_START+ 64)
#define WM_CAP_GET_SEQUENCE_SETUP (WM_CAP_START+ 65)
#define WM_CAP_SET_MCI_DEVICEA (WM_CAP_START+ 66)
#define WM_CAP_GET_MCI_DEVICEA (WM_CAP_START+ 67)
#define WM_CAP_SET_MCI_DEVICEW (WM_CAP_UNICODE_START+ 66)
#define WM_CAP_GET_MCI_DEVICEW (WM_CAP_UNICODE_START+ 67)
#ifdef UNICODE
#define WM_CAP_SET_MCI_DEVICE WM_CAP_SET_MCI_DEVICEW
#define WM_CAP_GET_MCI_DEVICE WM_CAP_GET_MCI_DEVICEW
#else
#define WM_CAP_SET_MCI_DEVICE WM_CAP_SET_MCI_DEVICEA
#define WM_CAP_GET_MCI_DEVICE WM_CAP_GET_MCI_DEVICEA
#endif
#define WM_CAP_STOP (WM_CAP_START+ 68)
#define WM_CAP_ABORT (WM_CAP_START+ 69)
#define WM_CAP_SINGLE_FRAME_OPEN (WM_CAP_START+ 70)
#define WM_CAP_SINGLE_FRAME_CLOSE (WM_CAP_START+ 71)
#define WM_CAP_SINGLE_FRAME (WM_CAP_START+ 72)
#define WM_CAP_PAL_OPENA (WM_CAP_START+ 80)
#define WM_CAP_PAL_SAVEA (WM_CAP_START+ 81)
#define WM_CAP_PAL_OPENW (WM_CAP_UNICODE_START+ 80)
#define WM_CAP_PAL_SAVEW (WM_CAP_UNICODE_START+ 81)
#ifdef UNICODE
#define WM_CAP_PAL_OPEN WM_CAP_PAL_OPENW
#define WM_CAP_PAL_SAVE WM_CAP_PAL_SAVEW
#else
#define WM_CAP_PAL_OPEN WM_CAP_PAL_OPENA
#define WM_CAP_PAL_SAVE WM_CAP_PAL_SAVEA
#endif
#define WM_CAP_PAL_PASTE (WM_CAP_START+ 82)
#define WM_CAP_PAL_AUTOCREATE (WM_CAP_START+ 83)
#define WM_CAP_PAL_MANUALCREATE (WM_CAP_START+ 84)
// Following added post VFW 1.1
#define WM_CAP_SET_CALLBACK_CAPCONTROL (WM_CAP_START+ 85)
// Defines end of the message range
#define WM_CAP_UNICODE_END WM_CAP_PAL_SAVEW
#define WM_CAP_END WM_CAP_UNICODE_END
