Hi Tim: Thanks a lot for you reply. According to the COM document , the
function declaration in C++ is lRet =
object.ReadDeviceBlock(szDevice、lSize、*lplData) Long lRet (return
value, 0 is read success, otherwise is read failed) Output CString
szDevice (Device register name) Input Long lSize (Read data counter)
Input Long *lplData (restore read value from device) Output and Visual
Basic .NET is IRet = object.ReadDeviceBlock(szDevice、iSize、iData(0))
Integer IRet (return value) Output String szDevice (Device
register name) Input Integer iSize (Read data counter) Input
Integer iData(n) (Read value from device) Output The COM is provided by
device vender, this fuction read a group(block) of data from device and wrire
those data to a array. The number of data read from device is second parameter.
those data will be restored to a array which first element is the third
parameter, it's a long int pointer. I run the demo program(C++ and VB), those
all write data to the array successfully. For read single data from device, the
COM provide another function: lRet = object.GetDeviceValue(szDevice,
*lplData) Long lRet (return value) Output CString szDevice
(Device register name) Input Long *lplData (restore read value from
device) Out
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