Unitech MR650, Руководство по программированию

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6. Camera Control - CameraDLL.DLL
This DLL is used to control MR650’s internal CCD camera.
p.s. Camera’ power on/off control functions are put on SysIOAPI.DLL because it is related to H/W function.
Please refer to Section 5.6
6.1. Open Camera
Function Description:
To open Camera. This API should be called first before executed any other functions.
Function call:
BOOL OpenCamera();
Return code:
TRUE: OK
FALSE: Fail to open
6.2. Close Camera
Function Description:
To close Camera. This function must be called after using the camera.
Function call:
void ReleaseCamera();
6.3. Preview CCD video input
Function Description:
Start preview within a rectangle area as given in the parameters (using screen coordinates). Actual
displaying area can be a little smaller than the rectangle for hardware reasons.
Function call:
void StartPreview(UINT left, UINT top, UINT width, UINT height);
Parameters(Input):
left: UINT : horizontal starting pixels point from left-top corner
top: UINT : vertical starting pixels point from left-top corner
width: UINT : horizontal pixel width
height: UINT : vertical pixel width
6.4. Stop Preview CCD video input
Function Description:
Stop preview.
Function call:
void StopPreview();
6.5. Capture image
Function Description:
Capture a photo with the specified resolution, must be called within StartPreview() and
StopPreview().
Function call:
BOOL CaptureImage(LPCTSTR filename, UINT width, UINT height);
Parameters(Input):
filename: LPCTSTR : File name (with path) to store capture image
width: UINT : horizontal pixel width
height: UINT : vertical pixel width
Return code:
TRUE: OK
FALSE: Fail to capture