Article View: borland.public.cppbuilder.database.multi-tier
Article #478TClientDataSet::LoadFromFile fails ??
From: Jim Melsom
Date: Wed, 15 Aug 2001 21:53
Date: Wed, 15 Aug 2001 21:53
29 lines
1976 bytes
1976 bytes
TClientDataSet::LoadFromFile
When a TClientDataSet component is constructed by a runtime BPL, the
LoadFromFile and LoadFromStream methods fail. When the BPL is
statically linked, the methods work. The same thing happens if you
derive a new component from TClientDataSet and create an instance in
code or drop it on a form. When dropped on a form, the IDE is able to
set the Active peorpty to true, but the program cannot.
Is this a known problem? Does anyone know the reason for it?
Example: If a BPL contains an exported function like the following
(inside or outside a class, it doesn't make any difference):
declaration:
TClientDataSet* _export CreateDS(TComponent* Owner);
implementation:
TClientDataSet* CreateDS(TComponent* Owner) { return new
TClientDataSet(Owner); };
An application that dynamically links this BPL will fail if it tries to
do the following:
TClientDataSet* ds = CreateDS(this);
ds->LoadFromFile(aValidDatasetFile);
If the BPL is statically linked, the function works.
Technical Details
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