Visual Foxpro VFP and Variant Structure

[bigdadxxl]

Hi,
we recently bought the PDF- XChange ViewerSDK and PDF - Xchange Viewer SDK.
We are using the PDF-Viewer ActiveX; everything is fine except we can't retrieve any properties. ( b.e. GetDocumentProperty(), ... ) since we don't know how to pass the "variant structure".
To be onest - we don't know what that means.

We would really apprecitate any help. Thanks

[Tracker - Clarion Support]

Hi bigdadxxl!

VARIANT is a datatype used to pass "typed" information between Windows modules (exe's and dll's usually) in a relatively safe manner.

It's often used within classes and objects. Visual Foxpro 9.0 supports it, for definition see:

http://msdn2.microsoft.com/en-us/librar ... S.80).aspx

I also suggest looking at the Viewer Visual Basic (VB) examples as they should be close to what you will need.

[bigdadxxl]

Hello Craig,

we already tried this:

LOCAL vData AS VARIANT
vData = ""
oPDFV.pdfviewer.GetProperty("General.ApplicationTitle",@vData,0)

We also tried out all other DataTypes with no result.
Other Functions like "GetActiveDocument" works well.

We also use several other ActiveX- Components in our application and since yet there are no problems retrieving data in that way.

We was confused about the variant "structure"; does the function "GetProperty" expect a special datatype or something like a null-terminated String ? ( we tried out this, too )

We also checked out the VBNet Samples; everything is fine there.

Since we are already working a long time on that problem , we appreciate your help.

Wolfgang Michelfelder
ids-software Ltd. & Co. KG ( Germany )

[John - Tracker Supp]

Hi Wolfgang,

I am afraid we have no experience with VFP specifically - so we are shooting in the dark - however, I suspect its this line you need to look at and replicate as closely as possible from the VB example :

Dim vDataOut As Variant
Call CoPDFXCview1.GetProperty("General.ApplicationTitle", vDataOut, 0)

Hope that helps

[bigdadxxl]

Hi,

we are still working on that problem - without a solution.
Could you please post these lines of your source code which recieve the variant structure value ? We assume that we have to initalisize the variable in VFP in a different way so your function can handle it.

Thanks in award

Wolfgang Michelfelder

[John - Tracker Supp]

Hi Wolfgang,

the easiest way I tink to resolve this is if you supply a complete - simple VFP project which inlcudes what you need (even if it does not work fully) and we will install VFP 9.x here and try and debug/correct for you.

Please supply all project files and any other files required - so we can compile and test/debug here - please ZIP and do not inlcude any license info in your source.

Many thanks.

[bigdadxxl]

Hello,

thanks for your help. Here's a simple prg- file which contains all necessary coding.

Regards

[Ivan - Tracker Software]

Solution for you:

Please replace the code

Code: Select all

oPDFViewer.pdfviewer.Property("General.ApplicationTitle", @vData, 0)

with

Code: Select all

vData = oPDFViewer.pdfviewer.Property("General.ApplicationTitle", 0)

[bigdadxxl]

Thanks !!

We changed from GetProperty(... ) to Property() ... it works!

[John - Tracker Supp]

Excellent - looks like there is an issue in VFP you might want to pass back to MS.