LBaseFile::RedirectSeekCallBack
#include "ltwrappr.h"
virtual L_INT32 LBaseFile::RedirectSeekCallBack(FD, lnPos, nOrigin)
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L_INT FD; |
/* the file to search */ |
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L_INT32 lnPos; |
/* starting position and direction */ |
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L_INT nOrigin; |
/* number of bytes */ |
Replaces the normal LEADTOOLS function for repositioning a file pointer.
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Parameter |
Description |
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FD |
Identifies the file to search. The file handle is returned by the RedirectOpenCallBack function. |
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lnPos |
The starting position and direction of the pointer. Possible values are: |
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Value |
Meaning |
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0 |
Move the file pointer nCount bytes from the beginning of the file. |
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1 |
Move the file pointer nCount bytes from its current position. |
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2 |
Move the file pointer nCount bytes from the end of the file. |
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nOrigin |
The number of bytes the pointer is to be moved. |
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Returns
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>0 |
The offset, in bytes, of the new position from the beginning of the file. |
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-1 |
The function failed. |
Comments
Override this function to replace the normal LEADTOOLS function for repositioning a file pointer.
The Redirect input / output functions cannot be used in combination with LFile::FeedLoad, LFile::StartFeedLoad, LFile::StopFeedLoad, LMemoryFile::LoadBitmap, LMemoryFile::LoadMemory, and LMemoryFile::SaveBitmap.
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Note: |
The Redirect input / output functions do not support Kodak PhotoCD (PCD), FlashPix (FPX), or Microsoft FAX (AWD) files. |
Required DLLs and Libraries
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LTKRN For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
See Also
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Functions: |
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Topics: |
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Example
For an example, refer to LFile::StartFeedLoad.