CAPDRIVERCAPS视频捕捉类

The CAPDRIVERCAPS structure defines the capabilities of the capture driver.

An application should use the WM_CAP_DRIVER_GET_CAPS message or capDriverGetCaps macro to place a copy of the driver capabilities in a CAPDRIVERCAPS structure whenever the application connects a capture window to a capture driver.

typedef struct { 
    UINT   wDeviceIndex; 
    BOOL   fHasOverlay; 
    BOOL   fHasDlgVideoSource; 
    BOOL   fHasDlgVideoFormat; 
    BOOL   fHasDlgVideoDisplay; 
    BOOL   fCaptureInitialized; 
    BOOL   fDriverSuppliesPalettes; 
    HANDLE hVideoIn; 
    HANDLE hVideoOut; 
    HANDLE hVideoExtIn; 
    HANDLE hVideoExtOut; 
} CAPDRIVERCAPS; 
 
Members
wDeviceIndex 
Index of the capture driver. An index value can range from 0 to 9. 
fHasOverlay 
Video-overlay flag. The value of this member is TRUE if the device supports video overlay. 
fHasDlgVideoSource 
Video source dialog flag. The value of this member is TRUE if the device supports a dialog box for selecting and controlling the video source. 
fHasDlgVideoFormat 
Video format dialog flag. The value of this member is TRUE if the device supports a dialog box for selecting the video format. 
fHasDlgVideoDisplay 
Video display dialog flag. The value of this member is TRUE if the device supports a dialog box for controlling the redisplay of video from the capture frame buffer. 
fCaptureInitialized 
Capture initialization flag. The value of this member is TRUE if a capture device has been successfully connected. 
fDriverSuppliesPalettes 
Driver palette flag. The value of this member is TRUE if the driver can create palettes. 
hVideoIn 
Not used in Win32 applications. 
hVideoOut 
Not used in Win32 applications. 
hVideoExtIn 
Not used in Win32 applications. 
hVideoExtOut 
Not used in Win32 applications. 
Requirements 
  Windows NT/2000/XP: Included in Windows NT 3.1 and later.
  Windows 95/98/Me: Included in Windows 95 and later.
  Header: Declared in Vfw.h.

See Also
Video Capture Overview, Video Capture Structures