防止多文档文档重复打开

1、调用此函数，程序会自动判断文档是否已经打开，若已经打开则把打开的此文档设为活动文档。

CRadPupApp*pApp=(CRadPupApp*)AfxGetApp();pApp->OpenDocumentFile(filepath);//调用此函数，程序会自动判断

2、自己写代码判断

void CRadPupApp::OpenFile(LPCTSTR lpszPathName)//OpenFile为自己写的打开函数{POSITION curTemplatePos = GetFirstDocTemplatePosition();while(curTemplatePos != NULL){CDocTemplate* curTemplate = GetNextDocTemplate(curTemplatePos);POSITION posDoc = curTemplate->GetFirstDocPosition();while (posDoc!= NULL){CRadPupDoc * pDoc = (CRadPupDoc *)curTemplate->GetNextDoc(posDoc);if (DocumentExist(pDoc,lpszPathName))///当文档存在的时候就在当前文档打开{CView * pView = NULL;POSITION pos = pDoc->GetFirstViewPosition();while (pos){pView = pDoc->GetNextView(pos);if (pView->IsKindOf(RUNTIME_CLASS(CRadPupView))){break;}else{pView = NULL;}}if (pView == NULL){return ;}CFrameWnd* pFrame = pView->GetParentFrame();pFrame->ActivateFrame();//关键在这句话return;}}curTemplate->OpenDocumentFile(lpszPathName);return;}}BOOL CRadPupApp::DocumentExist(CRadPupDoc * pDoc, LPCTSTR lpszPathName){if (pDoc == NULL){return FALSE;}CString strTitle = pDoc->GetTitle();CString strFile = lpszPathName;CString strFileTitle = strFile.Right(strFile.GetLength() - strFile.ReverseFind('\\') - 1);if (strTitle == strFileTitle){return TRUE;}return 0;}

 

注：不管是pApp->OpenDocumentFile(filepath)还是curTemplate->OpenDocumentFile(lpszPathName)，最终都会调用Doc类的BOOLCRadPupDoc::OnOpenDocument(LPCTSTRlpszPathName)，只要在Doc类写打开代码即可。