General information
Category:
COM/DCOM and OLE Automation
Perhaps playing with the "as " clause when making the array?
I've used this to create safearrays of bytes (VT_UI1) passed to COM servers BY_REF. Maybe something like this, without the COMARRAY of course, might help.
*-- For COM
LOCAL ARRAY aTest[1000] as BYTE
aTest = chr(0)
COMARRAY(oServer,10(or 11, depending))
oServer.Method(@aTest)
Gary
>Hello All,
>
>I'm currently trying to create a VFP wrapper around a DLL that was designed specifically for Visual Basic. (Using VFP 6.0 sp5 on Win2K)
>
>95% of the DLL functions perfectly within VFP.
>
>I have, however, reached a stumbling block. One function of the DLL is expecting two parameters that I cannot seem to produce in Visual FoxPro. Luckily the DLL ships with examples for Visual Basic. The parameters are passed as character arrays in Visual Basic.
>
>The code to declare these variables in Visual Basic (version 6.0 sp5) is:
>
>' Input data type. 7 lines of 50 characters each.
>Type INPTYPE
> InputLine(6) As String * 50
>End Type
>
>' Output data type. 10 Lines of 100 characters each
>Type OUTTYPE
> OutputLine(10) As String * 100
>End Type
>
>' Global structures used for function
>Public gInputType As INPTYPE
>Public gOutputType As OUTTYPE
>
>The code in Visual Basic that calls the function looks like this:
>
>Declare Function MY_Function Lib "mylib.dll" ( _
> InputType As INPTYPE, OutputType As OUTYPE
>
>Return% = MY_Function(gInputType, gOutputType)
>
>Once the function is called, gOutputType is populated with a range of results.
>
>I've tried a number of things in VFP. When dimensioning VFP arrays of the required element count/string size I receive Fatal Exceptions. When I use padded strings to create buffers (REPLICATE(CHR(0), 50*7)) the function appears to function without error but nothing is populated in the output parameter.
>
>I believe what I need to do is emulate the Visual Basic Character arrays within VFP... and so my question is: Can it be done, and if so, can anybody point me in teh right direction?
>
>I've trawled through the struct.vcx but cannot seem find anything that might help.
>
>Any advice would be much appreciated.
>
>Thanks in advance for any advice provided.
>
>Kind Regards,
>
>Ben Sugden
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