Program for transmitting messages with vc6.0 encoding server and client

Program for transmitting messages with vc6.0 encoding server and client

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Zhu Xiaohua, Nanjing University of Technology

---- Network Programming has become a fashion, and networks with TCP/IP protocols are more popular. compile a program for sending messages between the server and the client to increase your network programming experience. next I will introduce my program.

---- First introduce the server program:

---- 1. Create a project named "server", single document interface.

---- 2. Add the code to serverview. h:

# Include "Winsock. H "add variable: csize sizetotal; // control the scroll bar intcount; // number of information entries cstring m_data [1000]; // The information is stored in char hostname [260]; char hostaddress [20]; // host IP address socket m_sock; handle m_hlistenthread; // thread bool m_binitialized; // whether to initialize wsadatawsadata; bool flag; sockaddr_in saclnt; int saclntlen; bool isconnect; // whether to connect

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3. Reload the cserverview () constructor in serverview. cpp to create and bind nested words:

CServerView::CServerView(){// TODO: add construction code hereIsconnect=FALSE;flag=FALSE;sizeTotal.cy=350;sizeTotal.cx=300;m_hListenThread;count=5;int status;WSADATA wsaData;m_data[0]="initializing Windows Sockets DLL....";if((status=WSAStartup(0x0101,&wsaData))==0){m_data[0]+="Succeeded";m_bInitialized=TRUE;}else{m_bInitialized=FALSE;}m_sock=socket(AF_INET,SOCK_DGRAM,0);m_data[1]="Creating socket....";if(m_sock==INVALID_SOCKET){m_data[1]+="Failed";}m_data[1]+="Succeeded";m_data[2]="Binding socket....";sockaddr_in sa;sa.sin_family=AF_INET;sa.sin_addr.S_un.S_addr=htonl(INADDR_ANY);sa.sin_port=htons(5050);if(bind(m_sock,(PSOCKADDR)&sa,sizeof(sa))==SOCKET_ERROR){m_data[2]+="Failed";closesocket(m_sock);}m_data[2]+="Succeeded";m_data[3]="Creating listener thread....";unsigned long idThread;m_hListenThread=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)Listen,(void *)this,0,&idThread);if(m_hListenThread){m_data[3]+="Succeeded";m_data[4]+="Listening....";}elsem_data[4]+="Failed";} 

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4. Complete the necessary clearing operations in the Destructor:

CServerView::~CServerView(){if(m_bInitialized)WSACleanup();closesocket(m_sock);if(m_hListenThread)::TerminateThread(m_hListenThread,0);}

----

5. Define the thread for receiving and processing messages:

long WINAPI Listen(CServerView *pView){char msg[2000]="";intnchar;SOCKADDR_IN saClnt;int saClntLen;while(1){saClntLen=sizeof(saClnt);nchar=recvfrom(pView->m_sock,msg,1024,0,(PSOCKADDR)&saClnt,&saClntLen);if(nchar<0) { pView->m_data[pView->count++]+="Error in recvfrom/n";pView->InvalidateRect(NULL);}else{switch(msg[0]){case'A':wsprintf(msg,"A: Client from %s attached/n",inet_ntoa(saClnt.sin_addr));pView->m_data[pView->count++]=msg;pView->flag=TRUE;pView->InvalidateRect(NULL);pView->Isconnect=TRUE;pView->saClnt=saClnt;pView->saClntLen=saClntLen;sendto(pView->m_sock,msg,1024,0,(PSOCKADDR)&saClnt,saClntLen);break;case 'D':wsprintf(msg,"D: Client form %s detached/n",inet_ntoa(saClnt.sin_addr));pView->m_data[pView->count++]=msg;pView->flag=TRUE;pView->InvalidateRect(NULL);pView->Isconnect=FALSE;sendto(pView->m_sock,msg,1024,0,(PSOCKADDR)&saClnt,saClntLen);break;case 'R':saClntLen=sizeof(saClnt);pView->m_data[pView->count++]=msg;pView->flag=TRUE;pView->InvalidateRect(NULL);break;default:break;}}}return(0);}

----

6. Add "local IP Address" in the program menu ":

void CServerView::OnIp() {int WSAReturn;WSAReturn=WSAStartup( 0x0101, &WSAData );if( WSAReturn == 0 ){gethostname( Hostname, 260 );struct hostent *pHostEnt;pHostEnt = gethostbyname( Hostname);if( pHostEnt != NULL ){wsprintf( Hostaddress, "%d.%d.%d.%d",( pHostEnt->h_addr_list[0][0] & 0x00ff ),( pHostEnt->h_addr_list[0][1] & 0x00ff ),( pHostEnt->h_addr_list[0][2] & 0x00ff ),( pHostEnt->h_addr_list[0][3] & 0x00ff ) );CString out;out.Format(Hostaddress);AfxMessageBox(out);}}}

----

7. Add "Send message" in the program menu ":

void CServerView::OnSendmessage() {// TODO: Add your command handler code herechar msg[2000];Csend Sendmessage;if(Sendmessage.DoModal()==IDOK&&!Sendmessage.m_Message.IsEmpty()){wsprintf(msg,"R: "+Sendmessage.m_Message);sendto(m_sock,msg,1024,0,(PSOCKADDR)&saClnt,saClntLen);m_data[count++]=Sendmessage.m_Message;flag=TRUE;InvalidateRect(NULL);}}

----

8. add a dialog box class for sending message items, named send, with a text box used to send messages. add the cstring m_message variable to the text box and go to serverview. add # include "send. h"

---- 9. Add a judgment function for the message sending item:

void CServerView::OnUpdateSendmessage(CCmdUI* pCmdUI) {// TODO: Add your command update UI handler code herepCmdUI->Enable(FALSE);if(Isconnect)pCmdUI->Enable(TRUE);}

----

10. The message is displayed in the window:

void CServerView::OnDraw(CDC* pDC){if(flag){sizeTotal.cy+=20;for(int j=65;j
 
  TextOut(10,y,m_data[i]);y+=20;}// TODO: add draw code for native data here}
 

----

11. Click "Settings" in the project and select "Link" to add wsock32.lib. the final compilation program will be available to the server.exe program.

---- Introduce the client program now:

---- 1. Create a project named "client", single document interface.

---- 2. Add the code in clientview. h:

# Include "Winsock. H" to add variables: cstring m_data [1000]; handle m_hlistenthread; socket m_sock; sockaddr_in m_sasrvr; boolisconnect; int count; csize sizetotal; boolflag;

----

3. initialize the variable in the constructor:

CClientView::CClientView(){// TODO: add construction code hereIsconnect=FALSE;sizeTotal.cy=350;sizeTotal.cx=300;flag=FALSE;}

----

4. Complete the clearing operation in the Destructor:

CClientView::~CClientView(){if(m_bInitialized)WSACleanup();closesocket(m_sock);if(m_hListenThread)::TerminateThread(m_hListenThread,0);}

----

5. Add the "dial" item to the menu:

void CClientView::OnDial() {// TODO: Add your command handler code herecount=5;if(m_bInitialized){AfxMessageBox("Already dialing");return;}Cdial dial;if(dial.DoModal()==IDOK&&!dial.m_HostAddress.IsEmpty()){m_saSrvr.sin_family=AF_INET;m_saSrvr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);m_saSrvr.sin_addr.S_un.S_addr=inet_addr(dial.m_HostAddress);m_saSrvr.sin_port=htons(5050);int status;WSADATA wsaData;m_data[0]="initializing Windows Sockets DLL....";if((status=WSAStartup(0x0101,&wsaData))==0){m_data[0]+="Succeeded";m_bInitialized=TRUE;}else{m_bInitialized=FALSE;}m_sock=socket(AF_INET,SOCK_DGRAM,0);m_data[1]="Creating socket....";if(m_sock==INVALID_SOCKET){m_data[1]+="Failed";}m_data[1]+="Succeeded";m_data[2]="Binding socket....";sockaddr_in sa;sa.sin_family=AF_INET;sa.sin_addr.S_un.S_addr=htonl(INADDR_ANY);sa.sin_port=htons(0);if(bind(m_sock,(PSOCKADDR)&sa,sizeof(sa))==SOCKET_ERROR){m_data[2]+="Failed";closesocket(m_sock);}m_data[2]+="Succeeded";m_data[3]="Creating listener thread....";unsigned long idThread;m_hListenThread=CreateThread(NULL,0,(LPTHREAD_START_ROUTINE)Listen,(void *)this,0,&idThread);if(m_hListenThread){m_data[3]+="Succeeded";m_data[4]+="Waiting....";}elsem_data[4]+="Failed";InvalidateRect(NULL);}}

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6. Add a dialing dialog box named dial. There is a text box used to write IP addresses and add code in clientview. cpp:

#include dial.h

----

7. Add a judgment function to the dial-up item:

void CClientView::OnUpdateDial(CCmdUI* pCmdUI) {// TODO: Add your command update UI handler code herepCmdUI->Enable(TRUE);if(Isconnect)pCmdUI->Enable(FALSE);}

----

8. Add the thread for receiving and sending messages:

long WINAPI Listen(CClientView *pView){char msg[2000];pView- >m_data[5]="Sending ATTACH command";pView- >InvalidateRect(NULL);wsprintf(msg,"A: ");sendto(pView- >m_sock,msg,1024,0,(PSOCKADDR)&pView- >m_saSrvr,sizeof(pView- >m_saSrvr));int saSrvrLen ,nchar;while(1){saSrvrLen=sizeof(pView->m_saSrvr);nchar=recvfrom(pView- >m_sock,msg,1024,0,(PSOCKADDR)&pView- >m_saSrvr,&saSrvrLen);if(nchar<0) { pView->m_data[pView- >count++]="Error in recvform";pView- >InvalidateRect(NULL);}else{pView->m_data[pView- >count++]=msg;pView->Isconnect=TRUE;pView->flag=TRUE;pView->InvalidateRect(NULL);}}return(0);}

----

9. Make a message sending item like the main program. The Code is as above.

---- 10. The display program is the same as the main program, and the code is as above.

---- 11. Click settings in the project and select link to add wsock32.lib.

---- 12.compile the program to access the client.exe program.

---- After server.exe and client.exe are completed, they can be executed in a network with TCP/IP protocol. through the above example, you can quickly understand the advantages of VC ++ network programming. You can also add other functions, which I will not discuss here. I hope that my program can serve as an example, so that we can compile a good network program.