如何实现拖曳指定格式的文件到我的程序中，其他格式不允许拖入

[paschen]

下面是我实现拖曳的代码：

	TCHAR Path[MAX_PATH];
	int nDrag = (int)DragQueryFile(hDropInfo,0xFFFFFFFF,0,MAX_PATH);
	DragQueryFile(hDropInfo,nDrag - 1,Path,MAX_PATH); //只取最后一个文件
	SetDlgItemText(IDC_PATH, Path);  
	DragFinish(hDropInfo);

可是我想像别有些的程序一样，实现仅允许拖入指定格式的文件到我的程序中

比如只允许拖入txt格式，当拖入格式不是txt时候，文件拖曳到程序显示的图标是禁止图标（一个圆加一斜杆）

跪求如何实现？

[处处留心]

判断文件格式呗，取.txt就是最后一个小数点后面的字符串进行判断，看是否是你需要的格式

[paschen]

引用 1 楼 luxiaolai861227 的回复:

判断文件格式呗，取.txt就是最后一个小数点后面的字符串进行判断，看是否是你需要的格式

关键是怎么显示禁止符号

[schlafenhamster]

DROPEFFECT CLeftView::OnDragOver(COleDataObject* pDataObject, DWORD dwKeyState, CPoint point) { // TODO: Add your specialized code here and/or call the base class DROPEFFECT deResult=DROPEFFECT_NONE; CMainFrame* pMain=(CMainFrame*)AfxGetMainWnd(); CTreeCtrl& LeftTree=this->GetTreeCtrl(); // CPoint pt; GetCursorPos(&pt); pMain->m_pDragImage->DragMove(pt); // check if hit UINT uHitTest; HTREEITEM hTarget=LeftTree.HitTest(point,&uHitTest); if(!hTarget) return deResult;// can't drop // get src char SrcText[40*MaxSelectNum]; if(!pMain->GetSourceText(pDataObject,SrcText)) return deResult; // drop is "My Computer" CString drive=LeftTree.GetItemText(hTarget); if(stricmp(drive.GetBuffer(50),"My Computer")==0 || stricmp(drive.GetBuffer(50),"Control 802D")==0 ) { return deResult;// DROPEFFECT_NONE } // not virtual dir char SrcPath[MAX_PATH]; memset(SrcPath,0,MAX_PATH); strncpy(SrcPath,SrcText,strchr(SrcText,',')-SrcText); // drop char DropPath[MAX_PATH]; pMain->TreeItemPath(DropPath,hTarget); // drop drive if(strchr(DropPath,':')==0) // "My Computer" { // no ":" strcat(DropPath,drive.GetBuffer(MAX_PATH)); } // hide DragImage pMain->m_pDragImage->DragLeave(NULL); // BOOL MyPC=pMain->CutDriveName(DropPath); if(pMain->SameDrive(SrcPath,DropPath)) deResult=DROPEFFECT_MOVE;//2 else deResult=DROPEFFECT_COPY;//1 // new hightlight LeftTree.SelectDropTarget(hTarget); // for auto expanding if(PrevDrop!=hTarget) { PrevDrop=hTarget; m_iTimerCount=0; } if(pDataObject->IsDataAvailable(CF_TEXT)) { if(dwKeyState & MK_CONTROL) { //over write if(dwKeyState & MK_CONTROL) deResult=DROPEFFECT_COPY; else deResult=DROPEFFECT_MOVE; } } // show DragImage pMain->m_pDragImage->DragEnter(NULL,pt); // return deResult; // return CTreeView::OnDragOver(pDataObject, dwKeyState, point); }

[zgl7903]

CView::OnDragOver 返回 DROPEFFECT_NONE The data object cannot be dropped in this window.

[schlafenhamster]

"对话框的应用程序"里有treectrl , listctrl 吗

[fhw217]

参考一下这篇文章: http://www.vckbase.com/index.php/wv/112

[paschen]

谢谢3楼4楼，可是我想问一下，我的是对话框的应用程序，可以实现吗？