WINDIR environment variable|
include vmm.inc mov edx, OFFSET32 Filename ; points to name of file to open mov edi, OFFSET32 Buffer ; points to buffer to receive full path VMMcall OpenFile jc not_found ; carry flag is set if file not found mov [Handle], eax ; MS-DOS file handle |
The OpenFile service opens the file having the specified name. If the Filename parameter specifies only a filename (no drive letter or path separators included), this service searches for the file in the directories specified by the following:
WINDIR environment variable
First command-line argument (argv[0]) of Windows
Current working directory
PATH environment variable
Otherwise, the service does not search for the file. In either case, the service attempts to opens the file for reading (in compatibility mode), and returns the MS-DOS file handle if it is successful.
This service is only available during initialization.
Filename
Points to a null-terminated string specifying the name of the file to open.
Buffer
Points to a buffer that receives the full path of the file (if found). The buffer must be at least 128 bytes.
If the carry flag is clear, the EAX register contains a valid MS-DOS file handle (in the low word). The handle can be used in subsequent MS-DOS functions to read from or close the file. If the carry flag is set, the file cannot be found.
If WINDIR and PATH environment variables are not well formed, this service cannot guarantee that the full path copied to the Buffer parameter will be well formed.
This service fails if the current virtual machine cannot support a call to
the Exec_Int service, or if the virtual machine has already used the
_Allocate_Temp_V86_Data_Area service to allocate the temporary buffer.
EAX, Flags