Greetings All
I am currently attempting to pass an STDPicture object to the Picture
property of a class module within a DLL. However, none of the usual methods
seem to apply. The Microsoft Knowledge base has very little on the
STDPicture object.
Does anyone know if there is a build-in limitation that prevents you from
passing this type of object? If so, is there a work around method I've
missed? If anyone could point me toward some documentation that would
explain this I would greatly appreciate it.
Thanks.
Bruce
7  3396 
"Bruce A. Wilkinson" <bw******@grole n.com> wrote Greetings All
I am currently attempting to pass an STDPicture object to the Picture
property of a class module within a DLL. However, none of the usual methods
seem to apply. The Microsoft Knowledge base has very little on the
STDPicture object.
Does anyone know if there is a build-in limitation that prevents you from
passing this type of object? If so, is there a work around method I've
missed? If anyone could point me toward some documentation that would
explain this I would greatly appreciate it.
What problems are you having?
If you actually mean a picture PROPERTY then are you using the Set keyword?
LFS
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The dll is part of a graphics program I have written. The "Picture"
property is defined in the dll as an StdPicture object... (The Variable
"PreviewIma ge " is also Globally dimensioned within the dll as an StdPicture
object)
Public Property Set Picture(ByVal vData As StdPicture)
PreviewImage = vData
End Property
When the object is assigned to an image control within the Exe program it
works fine. But when it is passed to the dll's "Picture" property it
generates an error. Any other type of object passes without problem as long
as the Exe and the Dll objects are defined the same. However, with the
StdPicture object, an error is generated. This occurs even when the property
is left vacant of code.
Has anyone else ran into this problem?
You're into an area of VB that I've never played with before; so, if this
question seems silly, you will have to forgive me... and, if it works, I'll
not have an explanation as to why.<g> What happens if you pass the
StdPicture object ByRef instead of ByVal?
Rick - MVP
"Bruce A. Wilkinson" <bw******@grole n.com> wrote in message
news:sM******** *********@newsh og.newsread.com ... The dll is part of a graphics program I have written. The "Picture"
property is defined in the dll as an StdPicture object... (The Variable
"PreviewIma ge " is also Globally dimensioned within the dll as an
StdPicture object)
Public Property Set Picture(ByVal vData As StdPicture)
PreviewImage = vData
End Property
When the object is assigned to an image control within the Exe program it
works fine. But when it is passed to the dll's "Picture" property it
generates an error. Any other type of object passes without problem as
long as the Exe and the Dll objects are defined the same. However, with the
StdPicture object, an error is generated. This occurs even when the
property is left vacant of code.
Has anyone else ran into this problem?
"Bruce A. Wilkinson" <bw******@grole n.com> wrote The dll is part of a graphics program I have written. The "Picture"
property is defined in the dll as an StdPicture object... (The Variable
"PreviewIma ge " is also Globally dimensioned within the dll as an StdPicture
object)
Public Property Set Picture(ByVal vData As StdPicture)
PreviewImage = vData
End Property
Has anyone else ran into this problem?
I repeat:
If you actually mean a picture PROPERTY then are you using the Set keyword?
Public Property Set Picture(ByVal vData As StdPicture)
Set PreviewImage = vData
End Property
LFS
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Thanks very much Rick. Passing the image ByRef instead of ByVal was the
answer. It funny when you get involved in a large project how the little
things can elude you.
Thanks for the suggestion. It was much appreciated.
Bruce
Yes I am using the Set keyword. The problem was that I was trying to pass
the object ByVal instead of ByRef.
Thanks for your help. Have a great week.
"Bruce A. Wilkinson" <bw******@grole n.com> wrote Yes I am using the Set keyword. The problem was that I was trying to pass
the object ByVal instead of ByRef.
Thanks for your help. Have a great week.
In a property Set assignment, ByVal or ByRef would not matter,
they both point to the same object. What does matter is whether you
use Set in the assignment. Whenever you are using objects, expect to
use Set. What you posted, should not have compiled without the Set
keyword...
(The Variable "PreviewIma ge " is also Globally dimensioned within the
dll as an StdPicture object)
Public Property Set Picture(ByVal vData As StdPicture)
PreviewImage = vData
End Property
If PreviewImage is in fact declared as a StdPicture object, you should
have gotten the 'Invalid use of Property' error on compile because it
is missing the Set keyword. In this case, ByVal or ByRef only pertain
to the actual variable being passed, not the object it points to.
LFS
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