Handle the drag event in your dialog or the list. If your list is CListCtrl based use a LVN_BEGINDRAG handler. Otherwise use a WM_LBUTTONDOWN handler. From within that handler create a copy of the bitmap, cache it using the COleDataSource class and start the drag and drop operation:
// Get selected image into Bitmap here
stgm.tymed = TYMED_GDI;
stgm.hBitmap = static_cast<HBITMAP>(Bitmap.Detach());
stgm.pUnkForRelease = NULL;
// When moving is allowed pass DROPEFFECT_COPY | DROPEFFECT_MOVE
// here and delete the image when DoDragDrop returns DROPEFFECT_MOVE.
// Don't call default handler here when DoDragDrop has been called.
// Because OLE has handled all further mouse actions.
On the target side, use the COleDropTarget class. If the target is a CView derived class, it is simple to implement by adding a COleDropTarget member to the view, adding the virtual OnDrop... handlers and registering the view as drop target from OnInitialUpdate(). With other window types than CView based ones, you must derive your own window specific COleDropTarget class that knows your window class so that it can access the required functions and members.
From within the COleDropTarget::OnDrop[Ex] function, use the provided COleDataObject to get the data by calling GetData(CF_BITMAP, &stgm).
When using the MFC COle... classes, you must include afxole.h (e.g. in stdafx.h) and call AfxOleInit() from within InitInstance() of your Windows app class.
Hello guys. I am trying to write a small recording program but am stuck in basics. I can not pass the pointer of the WaveInProc function properly. I am trying it in two ways, both of them widely used on online examples.
1 - rResult = ::waveInOpen(&phWaveIn, WAVE_MAPPER, &pcmWaveFormat, (DWORD)WaveInProc, 0, CALLBACK_FUNCTION);
2 - rResult = ::waveInOpen(&phWaveIn, WAVE_MAPPER, &pcmWaveFormat, (DWORD)&WaveInProc, 0, CALLBACK_FUNCTION);
// then tried this one as well, generating error c2440
3 - rResult = ::waveInOpen(&phWaveIn, WAVE_MAPPER, &pcmWaveFormat, (DWORD)(VOID*)WaveInProc, 0, CALLBACK_FUNCTION);
Their corresponding error messages are shown as under
1 - error C2440: 'type cast' : cannot convert from 'void (__stdcall CWaveApiDlg::* )(HWAVEIN,UINT,DWORD,DWORD,DWORD)' to 'DWORD'2 - error C2276: '&' : illegal operation on bound member function expression
This is what WaveInProc looks like in my .cpp file
Well, you are passing a pointer to a (non static) method of class CWaveApiDlg where a function pointer is requested. You cannot do that. Either pass a (pointer to a) global function or to a static method of the class.
Read what buffer? Where is the actual bitmap data that you are reading? Assuming the client is sending this as a binary stream from the original bitmap buffer there should be no work to do at the server end other than ensuring you capture the entire buffer.
ifstream is basically for a file and not for a binary data.
What does this have to do with your problem?
As I understand it you are trying to transfer a bitmap from one computer to another via a network socket. So it is just a matter of transferring the binary data without any changes to its structure, and displaying the bitmap on the target system.
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