MFC添加拖动文件事件处理函数（二）

这里列举对于函数的处理---读取文件个数，并逐个计算每个文件的crc值。

代码如下：

void CFile_DemoDlg::OnDropFiles(HDROP hDropInfo)
{
    // TODO:  在此添加消息处理程序代码和/或调用默认值
    UINT fileCount;
    WORD crc,n;
    BYTE szchar[201], crc_hex[4], bt;
    CString strtmp;
    TCHAR file_name[MAX_PATH] = { 0 };
    //get number of drop files.
    fileCount = DragQueryFile(hDropInfo,0xffffffff,NULL,0);
    for (UINT i = 0; i < fileCount; i++)
    {
        DragQueryFile(hDropInfo,i,file_name,MAX_PATH-1);//get the file name of the i-th file
        CFile file(file_name,CFile::modeRead);//open the file
        UpdateData(true);
        m_path += file.GetFilePath();
        m_path += "
";
        crc = 0xffff;
        memset(szchar, 0, 201);
        while (file.Read(szchar, 200))
        {
            n = 0;
            while (szchar[n])
            {
                crc = crc_16(crc, szchar[n]);
                n++;
            }
            memset(szchar, 0, 201);
        }
        strtmp.Format(_T("%d"), crc);
        m_dec += strtmp;
        m_dec += "
";
        swap_word_byte(crc, crc_hex);
        for (UINT i = 0; i < 4; i++)
        {
            bt = *(char*)(crc_hex + i);
            strtmp.Format(_T("%c"), bt);
            m_hex += strtmp;
        }
        m_hex += "
";
        UpdateData(false);
        CEdit *pEdit = (CEdit*)this->GetDlgItem(IDC_EDIT1);
        pEdit->LineScroll(pEdit->GetLineCount()); 
        pEdit = (CEdit*)this->GetDlgItem(IDC_EDIT2);
        pEdit->LineScroll(pEdit->GetLineCount()); 
        pEdit = (CEdit*)this->GetDlgItem(IDC_EDIT3);
        pEdit->LineScroll(pEdit->GetLineCount());
        file.Close();
    }
    DragFinish(hDropInfo);


    CDialogEx::OnDropFiles(hDropInfo);
}

注： fileCount = DragQueryFile(hDropInfo,0xffffffff,NULL,0); 返回拖拽文件个数。

谢谢.