REDIRECTCLOSE Callback Function
#include "l_bitmap.h"
L_INT L_FAR L_EXPORT YourClose(FD, pUserData)
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L_INT FD; |
/* file handle */ |
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/* pointer to additional parameters */ |
Replaces the normal LEADTOOLS function for closing a file.
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Parameter |
Description |
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FD |
Identifies the file to be closed. The file handle is returned by the REDIRECTOPEN callback function. |
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pUserData |
A void pointer that you can use to access a variable or structure containing data that your callback function needs. This gives you a way to receive data indirectly from the function that uses this callback function. (This is the same pointer that you pass in the pUserData parameter of the calling function.) |
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Keep in mind that this is a void pointer, which must be cast to the appropriate data type within your callback function. |
Returns
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0 |
The file was closed. |
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-1 |
The function failed. |
Comments
For information about using this type of callback, refer to L_RedirectIO.
Example
To see how the following function is defined and called, refer to L_RedirectIO.
/* This procedure is a replacement to the built in Close procedure.
This may be called many times, especially by L_FileInfo, so
we need to reset the internal data structure to the defaults. */
/************************** Global Declarations **********************************/
typedef struct tagUSERDATA
{
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L_INT32 dwSize; |
/* Size of the buffer. */ |
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L_INT32 dwUsed; |
/* Number of bytes used. */ |
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L_CHAR L_HUGE *pData; |
/* Pointer to the buffer. */ |
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L_CHAR L_HUGE *pCurData; |
/* Current pointer location. */ |
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} USERDATA, L_FAR * LPUSERDATA; |
/* Pointer to DATA structure */ |
/******************************************************************************/
L_INT L_FAR L_EXPORT WindowsClose (L_INT FD)
{
UNREFERENCED_PARAMETER (FD);
UserData.pCurData = UserData.pData;
UserData.dwUsed = 0;
return (TRUE);
}