Dear Colleagues,

Using the XbpMetaFile, i noticed something odd. (build 1360)

When I do:
cMetaData :=<some_windows_wmf_data>

oMetaFile :=XbpMetaFile():New():Create()
oMetaFile:SetBuffer(cMetaData)

the content of the buffer is Nil

If I do:
cMetaData :=<some_windows_wmf_data>

oMetaFile :=XbpMetaFile():New():Create()
oMetaFile:Load("picture.wmf")
oMetaFile:SetBuffer(cMetaData)

the content of the buffer is <some_windows_wmf_data>
but only if the file "picture.wmf" exists, and contains wmf-data.

If I do the following:
cMetaData :=<some_windows_wmf_data>

oFileDev  :=XbpFileDef():New():Create()
oMetaFile :=oFileDev:MetaFile()
oFileDev:Destroy()
oMetaFile:SetBuffer(cMetaData)

the content of the buffer is <some_windows_wmf_data>

What is the reason, the buffer does not get set in the first
oMetaFile:SetBuffer(cMetaData) scenario?

I attached 2 files, one can be used to load a wmf-file, the other
can be used to read the <some_windows_wmf_data> from.

Regards,
Frans Vermeulen

I digged deeper into the issue, and from the docs:
===
 The initial creation of a metafile always uses an XbpFileDev object that generates an XbpMetaFile object.
===

Which means (as far as I read it) that for creating an actual wmf-file on disk,
you need the XbpFileDev-route. A bit odd, because AFAICS, you can use any 
enhanced-metafile (EMF, not WMF nor EMF+) to load into the XbpMetaFile.

From the setBuffer()-documentation:
===
This allows graphic data to be exchanged between different XbpMetaFile objects. 
===
which confuses me into believing, that what I do is not illegal, and is supposed to work.

Can anyone shed some light on this?
Frans Vermeulen


> Dear Colleagues,
> 
> Using the XbpMetaFile, i noticed something odd. (build 1360)
> 
> When I do:
> cMetaData :=<some_windows_wmf_data>
> 
> oMetaFile :=XbpMetaFile():New():Create()
> oMetaFile:SetBuffer(cMetaData)
> 
> the content of the buffer is Nil
> 
> If I do:
> cMetaData :=<some_windows_wmf_data>
> 
> oMetaFile :=XbpMetaFile():New():Create()
> oMetaFile:Load("picture.wmf")
> oMetaFile:SetBuffer(cMetaData)
> 
> the content of the buffer is <some_windows_wmf_data>
> but only if the file "picture.wmf" exists, and contains wmf-data.
> 
> If I do the following:
> cMetaData :=<some_windows_wmf_data>
> 
> oFileDev  :=XbpFileDef():New():Create()
> oMetaFile :=oFileDev:MetaFile()
> oFileDev:Destroy()
> oMetaFile:SetBuffer(cMetaData)
> 
> the content of the buffer is <some_windows_wmf_data>
> 
> What is the reason, the buffer does not get set in the first
> oMetaFile:SetBuffer(cMetaData) scenario?
> 
> I attached 2 files, one can be used to load a wmf-file, the other
> can be used to read the <some_windows_wmf_data> from.
> 
> Regards,
> Frans Vermeulen
> 
> 

Frans Vermeulen <fv@gbor.nl>