Download MX Component Version 3 Programming Manual

4 FUNCTIONS
MELSOFT
4.3 Details of the Functions (Custom Interface)
This section explains the details of the functions.
The details of the functions in this section assume that the custom interface is used.
The custom interface may be used on only Visual C++ .
For the dispatch interface, refer to "Section 4.2 Details of the Functions (Dispatch
Interface)".
This section describes only the formats of the functions.
For details of other than the formats, refer to "Section 4.2 Details of the Functions
(Dispatch Interface)".
R
4.3.1 Open (Communication line opening)
hResult = object.Open( lplRetCode )
HRESULT
LONG
hResult
lplRetCode
Returned value of COM
Output
Returned value of communication function Output
4.3.2 Close (Communication line closing)
hResult = object.Close( lplRetCode )
HRESULT
LONG
hResult
lplRetCode
Returned value of COM
Output
Returned value of communication function Output
4.3.3 ReadDeviceBlock (Device batch-read)
hResult = object.ReadDeviceBlock( szDevice, lSize,
lplData,
lplRetCode )
HRESULT
hResult
Returned value of COM
Output
BSTR
szDevice
Device name
Input
LONG
lSize
Number of read points
Input
LONG
lplData
Read device values
Output
LONG
lplRetCode
Returned value of communication function Output
4.3.4 WriteDeviceBlock (Device batch-write)
hResult = object.WriteDeviceBlock( szDevice, lSize, lplData, lplRetCode )
Returned value of COM
HRESULT
hResult
Output
Device name
BSTR
szDevice
Input
Number of write points
LONG
lSize
Input
Written device values
lplData
Input
LONG
Returned value of communication
LONG
lplRetCode
Output
function
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