L�m th? n�o �? t?o ra m?t ch?c n�ng t?p tin so s�nh trong Visual C#

ID c?a b�i: 320348 - Xem s?n ph?m m� b�i n�y �p d?ng v�o.

Th�ng b�o: b�i vi?t n�y l� b�i ��?c d?ch b?i M�y d?ch

Nh?p chu?t v�o ��y �? hi?n th? b?n g?c Ti?ng anh v� b?n d?ch m�y theo ch? �? so s�nh.

Bung t?t c? | Thu g?n t?t c?

B�i vi?t-by-step n�y ch?ng t? l�m th? n�o �? so s�nh hai t?p tin �? xem n?i dung c?a h? l� nh� nhau. So s�nh n�y nh?n v�o c�c n?i dung c?a hai t?p tin, kh�ng ph?i ? c�c t�n t?p tin, �?a �i?m, ng�y th�ng, th?i gian ho?c thu?c t�nh kh�c.

Ch?c n�ng n�y l� t��ng t? nh� MS-MS-DOS-d?a Fc.exe ti?n �ch c� ��?c bao g?m c�c phi�n b?n kh�c nhau c?a Microsoft Windows v� Microsoft MS-DOS, v� v?i m?t s? c�ng c? ph�t tri?n.

M?u m? ��?c m� t? trong b�i vi?t n�y th?c hi?n m?t so s�nh byte byte cho �?n khi n� t?m th?y m?t kh�ng ph� h?p ho?c n� �?t �?n cu?i c�ng c?a t?p tin. M? c?n th?c hi?n hai ki?m tra ��n gi?n �? t�ng hi?u qu? c?a vi?c so s�nh:

N?u c? hai t?p tin tham kh?o �i?m v�o c�ng m?t t?p tin, hai t?p tin ph?i ��?c b?nh �?ng.
N?u k�ch th�?c c?a hai t?p tin kh�ng ph?i l� nh� v?y, hai t?p tin l� kh�ng gi?ng nhau.

�? t?o ra c�c m?u

T?o m?t d? �n m?i Visual C# c?a s? ?ng d?ng. Theo m?c �?nh, Form1 ��?c t?o ra.
Th�m hai h?p ki?m so�t m?u.
Th�m m?t n�t l?nh m?u.
Tr�n c�c Xem tr?nh ��n, nh?p v�o Ma�.
Th�m d�?i ��y B?NG C�CH S? D?NG b�o c�o cho c�c Form1 l?p:
using System.IO;

Th�m c�c ph��ng ph�p sau ��y �? c�c Form1 l?p:

// This method accepts two strings the represent two files to 
// compare. A return value of 0 indicates that the contents of the files
// are the same. A return value of any other value indicates that the 
// files are not the same.
private bool FileCompare(string file1, string file2)
{
     int file1byte;
     int file2byte;
     FileStream fs1;
     FileStream fs2;

     // Determine if the same file was referenced two times.
     if (file1 == file2)
     {
          // Return true to indicate that the files are the same.
          return true;
     }
               
     // Open the two files.
     fs1 = new FileStream(file1, FileMode.Open);
     fs2 = new FileStream(file2, FileMode.Open);
          
     // Check the file sizes. If they are not the same, the files 
        // are not the same.
     if (fs1.Length != fs2.Length)
     {
          // Close the file
          fs1.Close();
          fs2.Close();

          // Return false to indicate files are different
          return false;
     }

     // Read and compare a byte from each file until either a
     // non-matching set of bytes is found or until the end of
     // file1 is reached.
     do 
     {
          // Read one byte from each file.
          file1byte = fs1.ReadByte();
          file2byte = fs2.ReadByte();
     }
     while ((file1byte == file2byte) && (file1byte != -1));
     
     // Close the files.
     fs1.Close();
     fs2.Close();

     // Return the success of the comparison. "file1byte" is 
     // equal to "file2byte" at this point only if the files are 
        // the same.
     return ((file1byte - file2byte) == 0);
}

D�n �o?n m? sau trong c�c Nh?p v�o s? ki?n c?a n�t l?nh:

private void button1_Click(object sender, System.EventArgs e)
{
   // Compare the two files that referenced in the textbox controls.
   if (FileCompare(this.textBox1.Text, this.textBox2.Text))
      {
         MessageBox.Show("Files are equal.");
      }
   else
      {
         MessageBox.Show("Files are not equal.");
      }  
}

L�u v� sau �� ch?y c�c m?u.
Cung c?p ��?ng d?n �?y �? �?n hai t?p tin trong c�c textboxes, v� sau �� nh?p v�o n�t l?nh.

Quay l?i �?u trang | Cung c��p Pha�n h��i

THAM KH?O

�? bi?t th�m chi ti?t, h?y truy c?p trang Web Microsoft sau ��y:

Kh�ng gian t�n System.io
(http://msdn2.Microsoft.com/en-US/Library/System.io (vs.71) .aspx

(http://msdn2.microsoft.com/en-us/library/system.io(vs.71).aspx)

)

Truy c?p t?p tin th�ng qua c�c l?p h?c FileStream
(http://msdn2.Microsoft.com/en-US/Library/Aa903246 (VS.71) .aspx

(http://msdn2.microsoft.com/en-us/library/Aa903246(VS.71).aspx)

)

Quay l?i �?u trang | Cung c��p Pha�n h��i

Thu?c t�nh

ID c?a b�i: 320348 - L?n xem x�t sau c�ng: 27 Tha�ng Ta�m 2011 - Xem x�t l?i: 2.0

�p d?ng

Microsoft Visual C# .NET 2002 Standard Edition
Microsoft Visual C# 2005 Express Edition

kbhowtomaster kbio kbmt KB320348 KbMtvi

M�y d?ch

QUAN TRO�NG: B�i vi?t n�y ��?c d?ch b?ng ph?n m?m d?ch m�y c?a Microsoft ch? kh�ng ph?i do con ng�?i d?ch. Microsoft cung c?p c�c b�i vi?t do con ng�?i d?ch v� c? c�c b�i vi?t do m�y d?ch �? b?n c� th? truy c?p v�o t?t c? c�c b�i vi?t trong C� s? Ki?n th?c c?a ch�ng t�i b?ng ng�n ng? c?a b?n. Tuy nhi�n, b�i vi?t do m�y d?ch kh�ng ph?i l�c n�o c?ng ho�n h?o. Lo?i b�i vi?t n�y c� th? ch?a c�c sai s�t v? t? v?ng, c� ph�p ho?c ng? ph�p, gi?ng nh� m?t ng�?i n�?c ngo�i c� th? m?c sai s�t khi n�i ng�n ng? c?a b?n. Microsoft kh�ng ch?u tr�ch nhi?m v? b?t k? s? thi?u ch�nh x�c, sai s�t ho?c thi?t h?i n�o do vi?c d?ch sai n?i dung ho?c do ho?t �?ng s? d?ng c?a kh�ch h�ng g�y ra. Microsoft c?ng th�?ng xuy�n c?p nh?t ph?n m?m d?ch m�y n�y.

Nh?p chu?t v�o ��y �? xem b?n ti?ng Anh c?a b�i vi?t n�y:320348

(http://support.microsoft.com/kb/320348/en-us/ )

Quay l?i �?u trang | Cung c��p Pha�n h��i