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Loading Bitmap image from ATL COM dll to MFC Client

Dear Experts,

We have a ATL COM dll which populates its control over remote MFC Client.
MFC Client passes RemoteHandle to COM dll for this job.

Now we have to load a bitmap image from dll over the dialog of MFC Client.
We have tried to it in OnPaint handler of dll but loading bitmap by LoadBitmap api requires Handle to the instance of the module whose executable file contains the bitmap to be loaded which i think is not possible to retreive.

Kindly let us know how can we do it.

jkr

>>loading bitmap by LoadBitmap api requires Handle to the instance of the module whose executable file
>>contains the bitmap

Not a big deal, just use

HINSTANCE hInst = GetModuleHandle("AtlComDll.dll");

LoadBitmap(hInst,MAKEINTRESOURCE(IDR_THEBITMAP));

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jkr

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SOLUTION

Dariusz Dziara

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Dariusz Dziara

Sorry it should be
2.

IYourInterface::GetBitmapMethod([out] LPBITMAPINFO **pbih, [out] BYTE **pbtBitmap)

jkr

Why would one pass the bitmap via a function call if you can just load it??

Dariusz Dziara

"Why would one pass the bitmap via a function call if you can just load it?"

1. To follow COM rules (bending them a little if necessary).
Accessing COM object through properties & methods.

Alternatively HBITMAP handler could be passed as a method parameter (can be only used as local object).

IYourInterface::GetBitmap([out] HBITMAP *phBmp)
{
// _Module.m_hInstance - DLL instance handle kwown to COM object in ATL
}

2. From COM point of view implementing DLL is hidden - there's only CLSID & object instance and no COM method of knowing DLL or instance handle.

jkr

You have a point there, but I'd rather pass the module name to keep that transparent, but not the whole resource.