文件列表:

DragDropDemo.c (4861, 2003-01-30)
dragdropdemo.rc (796, 2003-01-25)
DragDropDemores.h (176, 2003-01-25)
icon.ico (766, 1996-11-26)
IDataObject.c (6142, 2003-01-24)
IDragDrop.h (6197, 2003-01-24)
IDropSource.c (2851, 2003-01-24)
IEnumFORMATETC.c (4240, 2003-01-24)
lcc (0, 2003-01-30)
lcc\dgdrdemo.exe (11808, 2003-01-30)
lcc\Makefile (1774, 2003-01-30)
OleDragDrop.c (5736, 2003-01-30)

A proposal for creating COM interfaces with lcc-win32 with an extended structure holding the interface vtable and the required variables for one instance of the COM interface. The idea is to have as much similarity to CPP COM classes as possible because 99% of examples are CPP, especially MS code and, using COM will become very important in the future. Also some interfaces (an example is IEnumFORMATETC) requires clone-ing which creates problems with variables attached to the interface when using the usual vtable method. [History:] I wanted to implement dragging files onto the Desktop/Explorer - the only examples found were CPP. An example of an interface that needs clone-ing is CEnumFormatEtc. A CPP Class that implements the IEnumFORMATETC COM interface and it has these vars as private class members - DWORD m_cRefCount; LPFORMATETC m_pStrFE; ULONG m_iCur; ULONG m_cItems; With this proposed way one can also access the interface function (methods) without using the vtable pointer by casting a pointer to the struct that's used to hold the interface and vars - which might be convenient sometimes! Example: create the interface struct so that the vtable is the first part of the struct and the variables are the second part. // create the interface IDropSource * pDropSource = DropSource_CDropSource(); This pDropSource points to a struct that has the vtable but also has variables which can be accessed by casting the pDropSource pointer to a pointer to DropSourceEx. DropSourceEx * pDSEx = (DropSourceEx *) pDropSource; pDSEx->Release(pDropSource); One can also of course use the normal way of accessing the vtable functions which any other COM service will use. pDropSource->lpVtbl->Release(pDropSource); The zip file contains four other files, IDataObject.c, IDropSource.c, IEnumFormatEtc.c and IDragDrop.h which are sufficient for implementing dragging onto/into Explorer folders like the desktop. John

近期下载者：

相关文件：

评论：[我要评论] [举报此文件]

收藏者：