Writes a specified number of bytes from a buffer to the specified file.

#define INCL_DOSFILEMGR
#include <os2.h>

HFILE     hFile;      /*  File handle from DosOpen. */
PVOID     pBuffer;    /*  Address of the buffer that contains the data to write. */
ULONG     cbWrite;    /*  Number of bytes to write. */
PULONG    pcbActual;  /*  Address of the variable to receive the number of bytes actually written. */
APIRET    ulrc;       /*  Return Code. */

ulrc = DosWrite(hFile, pBuffer, cbWrite, pcbActual);