DOS/32 Advanced DOS Extender - Programmer's Reference

3.16 - DOS function 3Fh - Read from File


In: AH = 3Fh
EBX = file handle
ECX = number of bytes to read (size)
DS:EDX = pointer to buffer to read to (addr)

if successful:
CF clear
EAX = number of bytes read

if failed:
CF set
EAX = DOS error code


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