This function will be called during file operations when a READ is required.
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typedef LONG (ACCUAPI LPFNIG_READ) (
LONG fd,
LPBYTE lpBuffer,
LONG lSize
);
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| Name | Type | Description |
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| fd | LONG | File Descriptor handle. |
| lpBuffer | LPBYTE | Far pointer to buffer into which to read data. |
| lSize | LONG | Number of bytes to read. |
Return the number of bytes read, or -1 to indicate that an error occurred.
This function does not process image pixels.
See the example for function IG_file_IO_register().
This type of function is established by calling IG_file_IO_register() function.