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[转]VC++UDP实现可靠传输(文件)(虚拟TCP)(

Posted on 2009-12-02 23:17 S.l.e!ep.¢% 阅读(4541) 评论(1)  编辑 收藏 引用 所属分类: NetWork

VC++UDP实现可靠传输(文件)(虚拟TCP)(点击:1343)

/*
发布时间: 2008-12-27
程序版本: vtcp.dll ver1.0.0(beta0)
模块下载BIN: http://www.cnasm.com/down/vtcp.dll
测试程序BIN: http://www.cnasm.com/down/vtcptest.exe
测试程序SRC: http://www.cnasm.com/down/vtcptest.rar

吹一下: 别看vtcp程序小(17KB)但几乎模拟了TCP的一切,滑动窗口...目前他提供阻塞模式与异步完成模式API支持.

目前局网效率:
以UDP可靠传输文件为例,10OMbps局网传输极限速度(6MB/S),网络占有率50%
高于TCP协议(5MB/S),网络占有率50%,如何进一步提高UDP传输效率,还需要研究实验,我想我应该接近极限了,
目前要做的就是提高vtcp的稳定性与兼容winsock编程接口.

目前外网效率:
以UDP可靠传输文件为例,外网与TCP协议相当,TCP(50KB/S)时,测试VTCP(30-110KB/S).

vtcptest -s port : 打开服务端口
vtcptest -c host port path 下载文件

例如:
开服务执行: vtcptest -s 8080
下文件执行: vtcptest -c 192.168.0.102 8080 c:\1234.rmvb

connect...
connect ok!
save to: c:\1234.rmvb.download
recv: 214245376 bytes, rapid: 6152 kb/s
download ok ( 214592451 bytes )!!!

quit...
*/

//API接口

#pragma once

int WINAPI vtcp_startup();
int WINAPI vtcp_cleanup();
int WINAPI vtcp_socket(int type);//0=tcp client socket,1=tcp service socket
int WINAPI vtcp_bind(int s,PSOCKADDR_IN sai,int sailen);
int WINAPI vtcp_listen(int s,int backlog);
int WINAPI vtcp_accept(int s);
int WINAPI vtcp_connect(int s,PSOCKADDR_IN sai,int sailen,int timeo);
int WINAPI vtcp_sendex(int s,LPWSABUF lpBuffers,DWORD dwBufferCount,LPDWORD lpNumberOfBytesSent,
DWORD dwFlags,LPWSAOVERLAPPED lpOverlapped,LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
int WINAPI vtcp_recvex(int s,LPWSABUF lpBuffers,DWORD dwBufferCount,LPDWORD lpNumberOfBytesRecvd,
LPDWORD lpFlags,LPWSAOVERLAPPED lpOverlapped,LPWSAOVERLAPPED_COMPLETION_ROUTINE lpCompletionRoutine);
int WINAPI vtcp_send(int s,PCHAR buf,int len);
int WINAPI vtcp_recv(int s,PCHAR buf,int len);
int WINAPI vtcp_closesocket(int s);
int WINAPI vtcp_getlasterror(int s);

//////////////////////////////////////////////////////////////////////////
//int WINAPI vtcp_setkeepalive(int keepalive,int keepaliveinternal);
//int WINAPI vtcp_setsendtimeo(int timeo);
//int WINAPI vtcp_setrecvtimeo(int timeo);
//////////////////////////////////////////////////////////////////////////


//////////////////////////////////////////////////////////////////////////
//测试程序VC++ console 代码
//////////////////////////////////////////////////////////////////////////

 

// vtcptest.cpp : 定义控制台应用程序的入口点。

//

#include

"stdafx.h"

 

ULONG WINAPI TA(LPVOID p)

{

int s=int(p);

char buffer[8192];

while(true)

{

int rcb=vtcp_recv(s,buffer,sizeof(buffer));

if(rcb<0)

{

vtcp_closesocket(s);

return0;

}

HANDLE hfile=CreateFile(buffer,GENERIC_READ,FILE_SHARE_READ,NULL,OPEN_EXISTING,0,NULL);

if(INVALID_HANDLE_VALUE==hfile)

{

vtcp_closesocket(s);

return0;

}

DWORD cb=(-1);

while(true)

{

if(!ReadFile(hfile,buffer,8192,&cb,NULL))

{

break;

}

if(cb==0)

{

break;

}

if(0>=vtcp_send(s,buffer,cb))

{

break;

}

}

CloseHandle(hfile);

if(cb==0)

{

if(0>=vtcp_send(s,"X",1))

{

vtcp_closesocket(s);

return0;

}

}

else

{

vtcp_closesocket(s);

return0;

}

}

return0;

}

ULONG WINAPI TS(DWORD port)

{

SOCKADDR_IN sai;

sai.sin_family=AF_INET;

sai.sin_addr.S_un.S_addr=0;

sai.sin_port=htons(WORD(port));

int s=vtcp_socket(1);

if(0==s)

{

return SOCKET_ERROR;

}

if(0!=vtcp_bind(s,&sai,sizeof(sai)))

{

return SOCKET_ERROR;

}

if(0!=vtcp_listen(s,5))

{

return SOCKET_ERROR;

}

printf("listen success...\r\n");

while(true)

{

int as=vtcp_accept(s);

if(0!=as)

{

DWORD dwtid;

CloseHandle(CreateThread(NULL,0,TA,LPVOID(as),0,&dwtid));

printf("accept success...\r\n");

}

}

vtcp_closesocket(s);

return0;

}

ULONG WINAPI TC(PCHAR host,DWORD port,PCHAR path)

{

PHOSTENT ph=gethostbyname(host);

if(NULL==ph)

{

return0;

}

SOCKADDR_IN sai;

sai.sin_family=AF_INET;

sai.sin_addr.S_un.S_addr=*LPDWORD(ph->h_addr_list[0]);

sai.sin_port=htons(WORD(port));

int s=vtcp_socket(0);

printf("connect...\r\n");

if(vtcp_connect(s,&sai,sizeof(sai),1000*30))

{

vtcp_closesocket(s);

return0;

}

printf("connect ok!\r\n");

if(0>=vtcp_send(s,path,1024))

{

vtcp_closesocket(s);

return0;

}

char buffer[8192];

lstrcpy(buffer,path);

lstrcat(buffer,".download");

printf("save to: %s\r\n",buffer);

HANDLE hfile=CreateFile(buffer,GENERIC_WRITE,FILE_SHARE_READ,NULL,CREATE_ALWAYS,0,NULL);

if(INVALID_HANDLE_VALUE==hfile)

{

vtcp_closesocket(s);

return0;

}

DWORD wcb,count=0;

DWORD dw=GetTickCount();

DWORD dwsize=0,dwrapid;

while(true)

{

int rcb=vtcp_recv(s,buffer,sizeof(buffer));

if(rcb==1)

{

if(buffer[0]==$1$X$1$)

{

break;

}

}

if(!WriteFile(hfile,buffer,rcb,&wcb,NULL))

{

break;

}

count=count+rcb;

DWORD dw2=GetTickCount();

dwsize=dwsize+rcb;

if(dw2-dw>1000)

{

dwrapid=dwsize/(dw2-dw);

dwsize=0;

dw=dw2;

printf("recv: %d bytes, rapid: %d kb/s \r",count,dwrapid);

}

}

CloseHandle(hfile);

vtcp_closesocket(s);

printf("\r\n");

printf("download ok ( %d bytes )!!!\r\n",count);

printf("\r\n");

return0;

}

int

main(int argc,char* argv[])

{

vtcp_startup();

if(argc==3)

if(!lstrcmpi(argv[1],"-s"))

{

TS(atoi(argv[2]));

}

if(argc==5)

if(!lstrcmpi(argv[1],"-c"))

{

TC(argv[2],atoi(argv[3]),argv[4]);

}

vtcp_cleanup();

printf("quit...\r\n");

return0;

}

Feedback

# re: [转]VC++UDP实现可靠传输(文件)(虚拟TCP)([未登录]  回复  更多评论   

2010-04-28 20:25 by a
滑动窗口应该可以达到95%。你这才50%,还差的远呢

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