Re: Call a DLL from another atl DLL
comments inline...
"lel" <karim_saidi@hotmail.com> wrote in message
news:1175793344.515559.100140@q75g2000hsh.googlegroups.com...
Hi all, i am new to ATL and COM programming but I have to develop an
ATL DLL which called internally another COM DLL in order to do some
stuff (this DLL object is aimed to create an animated gif )...
What I have done is put an import directive in my cpp file as this :
#import "ImgMake.dll" no_namespace
and I implement a method in my COM DLL which create the ImgMake object
and add multiple frame image to it with a for loop as this :
CoInitialize(NULL);
You should check the HRESULT returned. My guess it is failing since
typically the main thread of a COM DLL has already called this. The only
reason to call CoInitialize() again is if you have launched a worker thread.
You can probably safely remove it along with the paired CoUninitialize();
IImgMakePtr im ;
for (item = m_itemList.begin(); item != m_itemList.end(); item++)
{
//... m_img_fileName is a BSTR member of an item
IBitmapPtr b ;
b.CreateFromFile(m_img_fileName);
im->Add(b);
}
im->Save(); // --> Where I have the error
CoUninitialize();
If I have only one item in my object list evry thing going fine, else
I have an error as I try to call the save method. (I have tryed also
to assign to b a NULL value before using it)
Can you help me with this?
Since you are using smart pointers, you should encapsulate inside a
try...catch construct, as in:
try
{
for (item = m_itemList.begin(); item != m_itemList.end(); item++)
{
//... m_img_fileName is a BSTR member of an item
IBitmapPtr b ;
b.CreateFromFile(m_img_fileName);
im->Add(b);
}
im->Save(); // --> Where I have the error
}
catch (_com_error e)
{
// analyze e.Message() here to find out what's wrong
}
HTH
Brian
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