利用 TCP/IP 作檔案續傳

bestlong

利用 TWinSocketStream 可以做到

1. var
   
2.   TServerWinSocket serverSocket;
   
3.   TClientWinSocket clientSocket;
   
4.   TFileStream inFile, outFile;
   
5.   // 假設各 Stream 都已 created
   
6. 
   
7. // 在 Server 端
   
8. // Client send 一個命令告知 Server 要由 536 bytes 開始傳
   
9. inFile.Position := 536;
   
10. wtih TWinSocketStream.Create(serverSocket, 60000) do
    
11. begin
    
12.   CopyFrom(inFile, inFile.Size - inFile.Position + 1);
    
13.   Free;
    
14. end;
    
15. 
    
16. // 在 Client 端 OnReadEvent 中
    
17. memStream = TMemoryStream.Create;
    
18. memStream.Size = TOTAL_FILE_SIZE;
    
19. memStream.Position := 0;
    
20. socketStream := TWinSocketStream.Create(clientSocket, 60000) do
    
21. if socketStream.WaitForData(60000) then // give the client 60 seconds writing
    
22.   socketStream.Read(PCharArray(memStream.Memory)^, TOTAL_FILE_SIZE)
    
23. memStream.Position := 0;
    
24. outFile.Position := 536;
    
25. outFile.CopyFrom(memStream);
    
26. 
    
27. // 释放全部的对象

複製代碼