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4/8/2010

This function reads data from a file on a remote Windows Embedded CE–based device. The read operation starts the position indicated by the file pointer. After the read operation has been completed, the file pointer is adjusted by the number of bytes actually read.

Syntax 

BOOL CeReadFile ( 
  HANDLE 
hFile, 
  LPVOID 
lpBuffer, 
  DWORD 
nNumberOfBytesToRead, 
  LPDWORD 
lpNumberOfBytesRead, 
  LPOVERLAPPED 
lpOverlapped 
);

Parameters

hFile

[in] Handle to the file to be read. The file handle must have been created with GENERIC_READ access to the file. This parameter cannot be a socket handle.

lpBuffer

[out] Pointer to the buffer that receives the data read from the file.

nNumberOfBytesToRead

[in] Number of bytes to be read from the file.

lpNumberOfBytesRead

[out] Pointer to the number of bytes read. CeReadFilesets this value to zero before doing any work or error checking.

lpOverlapped

[in] Unsupported; set to NULL.

Return Value

The CeReadFilefunction returns when one of the following is true: the number of bytes requested has been read or an error occurs.

Nonzero indicates success. Zero indicates failure. If the return value is nonzero and the number of bytes read is zero, the file pointer was beyond the current end of the file at the time of the read operation. To get extended error information, call CeGetLastErrorand CeRapiGetError.

Remarks

If part of the file is locked by another process and the read operation overlaps the locked portion, this function fails.

Accessing the input buffer while a read operation is using the buffer may lead to corruption of the data read into that buffer. Applications must not read from, write to, reallocate, or free the input buffer that a read operation is using until the read operation completes.

The ReadFilefunction may fail and return ERROR_INVALID_USER_BUFFER or ERROR_NOT_ENOUGH_MEMORY whenever there are too many outstanding asynchronous I/O requests.

When a synchronous read operation reaches the end of a file, ReadFilereturns TRUE and sets * lpNumberOfBytesReadto zero. Windows Embedded CE does not support asynchronous read operations on files.

Requirements

Header rapi.h
Library rapi.lib
Windows Embedded CE Windows CE 3.0 and later
Windows Mobile Pocket PC 2002 and later, Smartphone 2002 and later

See Also