通过打开按钮打开文件和通过左键移动打开文件并计算crc

We have learn open a file by using an open button, here is code below:

 1 void CFileCrcDlg::OnOpen() 
 2 {
 3     // TODO: Add your control notification handler code here
 4     WORD n;
 5     WORD i;
 6     BYTE szchar[201];
 7     BYTE crc_hex[4],bt;
 8     CString strtemp="";
 9     CFileDialog fileDlg(TRUE);
10     fileDlg.m_ofn.lpstrFilter="All files (*.*)";
11     if(fileDlg.DoModal()==IDOK)
12     {
13         CFile file(fileDlg.m_ofn.lpstrFile,CFile::modeRead);
14         UpdateData(TRUE);
15         m_path += file.GetFilePath();
16         m_path += "
";
17         //clear the Edit Dlg
18         i=0xffff;
19         memset(szchar,0,201);
20         while(file.Read(szchar,200))
21         {
22             n=0;
23             while(szchar[n])
24             {
25                 i=crc_16(i,szchar[n]);
26                 n++;
27             }
28             memset(szchar,0,201);
29         }
30         strtemp.Format("%d",i);
31         m_crc_dec+=strtemp;
32         m_crc_dec+="
";
33         
34         swap_word_byte(i,crc_hex);
35         for(i=0;i<4;i++)
36         {
37             bt =*(char*)(crc_hex+i);
38             strtemp.Format("%c",bt);
39             m_crc_hex+=strtemp;
40         }
41         m_crc_hex += "
";
42         file.Close();
43         UpdateData(FALSE);
44     }
45 }

void CFileCrcDlg::OnOpen()

Now, we are going to using another way to open a file and get the crc check sum.

here is the code:

 1 void CFileCrcDlg::OnDropFiles(HDROP hDropInfo) 
 2 {
 3     // TODO: Add your message handler code here and/or call default
 4     UINT j,iFileCount;
 5     char file_name[MAX_PATH];
 6     //variable for crc
 7     WORD n;
 8     WORD i;
 9     BYTE szchar[201];
10     BYTE crc_hex[4],bt;
11     CString strtemp="";
12 
13     iFileCount=::DragQueryFile(hDropInfo,0xffffffff,NULL,0);
14     
15     for(j=0;j<iFileCount;j++)
16     {
17         ::DragQueryFile(hDropInfo,j,file_name,MAX_PATH);
18         CFile file(file_name,CFile::modeRead);
19         UpdateData(TRUE);
20         m_path += file.GetFilePath();
21         m_path += "
";
22         //clear the Edit Dlg
23         i=0xffff;
24         memset(szchar,0,201);
25         while(file.Read(szchar,200))
26         {
27             n=0;
28             while(szchar[n])
29             {
30                 i=crc_16(i,szchar[n]);
31                 n++;
32             }
33             memset(szchar,0,201);
34         }
35         strtemp.Format("%d",i);
36         m_crc_dec+=strtemp;
37         m_crc_dec+="
";
38         
39         swap_word_byte(i,crc_hex);
40         for(i=0;i<4;i++)
41         {
42             bt =*(char*)(crc_hex+i);
43             strtemp.Format("%c",bt);
44             m_crc_hex+=strtemp;
45         }
46         m_crc_hex += "
";
47         file.Close();
48         UpdateData(FALSE);
49     }
50     ::DragFinish(hDropInfo);
51     CDialog::OnDropFiles(hDropInfo);
52 }

void CFileCrcDlg::OnDropFiles(HDROP hDropInfo)

OK, Enjoy. Thank you!

B.R.

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原文地址：https://www.cnblogs.com/lumao1122-Milolu/p/7775051.html