Help Version 19.0.2017.10.27
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#include "ltwrappr.h"
virtual L_INT LWia::AcquireImageFromVideo(pszFileName, puLength)
L_TCHAR * pszFileName; |
pointer to a string buffer to be updated |
L_SIZE_T * puLength; |
pointer to a variable that contains the user allocated string buffer length |
Extracts a still image from the video stream, and saves the image as a JPEG file.
Parameter |
Description |
pszFileName |
Receives the full path and filename of the JPEG file that this method creates. |
puLength |
Pointer to a variable that contains the user allocated string buffer length. This parameter will always be updated with the exact required string buffer length. |
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
This feature is available in LEADTOOLS version 16 or higher.
To retrieve the required string buffer length, declare a variable of type L_SIZE_T and pass the address of that variable to this function and also pass NULL for the pszFileName parameter. Then you can use the returned buffer length to allocate your string buffer with the exact required buffer length. But still this function will save the image to the images directory in this case.
Required DLLs and Libraries
LTWIA For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Functions: |
LWia::StartVideoPreview, LWia::ResizeVideoPreview, LWia::EndVideoPreview, LWia::IsVideoPreviewAvailable, LWia::InitSession, LWia::EndSession, Class Members |
Topics: |
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For an example, refer to LWia::IsVideoPreviewAvailable.