在CFileDialog中选择多个文件

Question

在VC++ 6.0中,MFC我想选择多个文件

CFileDialog opendialog(true); // opens the dialog for open;
opendialog.m_ofn.lpstrTitle="SELECT FILE"; //selects the file title;
opendialog.m_ofn.lpstrFilter="text files (*.txt)\0*.txt\0"; //selects the filter;

if(opendialog.DoModal()==IDOK) //checks wether ok or cancel button is pressed;
{
    srcfilename=opendialog.GetPathName(); //gets the path name;
    ...
}

上面的代码示例一次只允许选择一个文件,但我想选择多个文本文件,例如按住控制键(ctrl+选择多个文件).我怎样才能做到这一点？

Answer 1

因此,在CFileDialog的构造函数中,您可以将dwFlags参数设置为"OFN_ALLOWMULTISELECT".这是一个简单的部分,要实际获取多个文件名,您必须修改CFileDialog中的m_ofn.lpstrFile成员以指向您已分配的缓冲区.看看这里:

http://msdn.microsoft.com/en-us/library/wh5hz49d(VS.80).aspx

这是一个使用它的示例,希望评论足够:

void CMainFrame::OnFileOpen()
{
    char strFilter[] = { "Rule Profile (*.txt)|*.txt*||" };

    CFileDialog FileDlg(TRUE, "txt", NULL, OFN_ALLOWMULTISELECT, strFilter);
    CString str;
    int nMaxFiles = 256;
    int nBufferSz = nMaxFiles*256 + 1;
    FileDlg.GetOFN().lpstrFile = str.GetBuffer(nBufferSz);
    if( FileDlg.DoModal() == IDOK )
    {
        // The resulting string should contain first the file path:
        int pos = str.Find(' ', 0);
        if ( pos == -1 );
            //error here
        CString FilePath = str.Left(pos);
        // Each file name is seperated by a space (old style dialog), by a NULL character (explorer dialog)
        while ( (pos = str.Find(' ', pos)) != -1 )
        {   // Do stuff with strings
        }
    }
    else
        return; 
}

Answer 2

一个例子：

CString sFilter = _T("XXX Files (*.xxx)|*.xxx|All Files (*.*)|*.*||");


CFileDialog my_file_dialog(TRUE, _T("xxx"),NULL,
                           OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_FILEMUSTEXIST | OFN_ALLOWMULTISELECT,
                           sFilter, this);

if ( my_file_dialog.DoModal()!=IDOK )
    return;

POSITION pos ( my_file_dialog.GetStartPosition() );
while( pos )
{
    CString filename= my_file_dialog.GetNextPathName(pos);

    //do something with the filename variable
}

Answer 3

您应该在OpenFileName结构中传递 OFN_ALLOWMULTISELECT 标志以允许多重选择。