江湖救急，socekt通讯 ，为什么我发送接收不成功，有源码，哪位老大帮看看错哪了？

[wenyongjie]

接收: #include <winsock2.h>
SOCKET m_RcvSock; //接收用的SOCK
bool InitRcvSock(DWORD m_RcvPort)
{
WSADATA data;
int ret=WSAStartup( 0x0202, &data );

m_RcvSock=socket( AF_INET, SOCK_DGRAM, 0 );
if( m_RcvSock==INVALID_SOCKET )
return false;

struct sockaddr_in Local_Addr;
ZeroMemory( &Local_Addr, sizeof(Local_Addr) );
Local_Addr.sin_family=AF_INET;
Local_Addr.sin_port=htons( m_RcvPort );//接收端口
Local_Addr.sin_addr.S_un.S_addr=INADDR_ANY;
ret=bind( m_RcvSock, (sockaddr*)&Local_Addr, sizeof(struct sockaddr_in) );
if( ret==SOCKET_ERROR )
{
closesocket( m_RcvSock );
m_RcvSock=INVALID_SOCKET;
return false;
}
return true;
}
//----------------------
void Recving( )
{
struct sockaddr_in Addr_From;
ZeroMemory( &Addr_From, sizeof(Addr_From) );
char buffer[1024];
long bytes = 0;
int i;
bool m_IsRecving = true;

while( m_IsRecving )
{
i = sizeof(Addr_From);
buffer[0]='\0';
ShowMessage("运行到这里就不行了");
bytes = recvfrom( m_RcvSock, (char*)buffer, 1024, 0, (sockaddr*)&Addr_From, (int *)&i );
ShowMessage(buffer);////在上面这句卡死了

if( (bytes == SOCKET_ERROR) || (bytes == 0) )
{
if( bytes == SOCKET_ERROR )
{
///
}
if( bytes==0 )
{
//
}
m_IsRecving = false;
}
else
{
///
}
}


}
void __fastcall TForm1::Button1Click(TObject *Sender)
{
InitRcvSock(2018);
Recving();
}
//---------------------------------------------------------------------------

发送:#include <winsock2.h>
SOCKET m_SendSock; //发送用的SOCK
bool InitSendSock( void )//初始化
{
WSADATA data;
int ret=WSAStartup( 0x0202, &data );
if( m_SendSock!=INVALID_SOCKET ) return true;
m_SendSock=socket( AF_INET, SOCK_DGRAM, 0 );
if( m_SendSock==INVALID_SOCKET )
return false;

struct sockaddr_in Local_Addr;
ZeroMemory( &Local_Addr, sizeof(Local_Addr) );
Local_Addr.sin_family=AF_INET;
Local_Addr.sin_port=htons( 0 );/////
Local_Addr.sin_addr.S_un.S_addr=INADDR_ANY;
ret=bind( m_SendSock, (sockaddr*)&Local_Addr, sizeof(Local_Addr) );
if( ret==SOCKET_ERROR )
{
closesocket( m_SendSock );
m_SendSock=INVALID_SOCKET;
//提示出错
return false;
}

return true;
}

//------------------------------------------------------------------------------
bool SendData(DWORD m_SendPort ,char * m_SendIp ,const char *buffer, long inLength ) //发送
{
struct sockaddr_in To_Addr;
ZeroMemory( &To_Addr, sizeof(To_Addr) );
To_Addr.sin_family=AF_INET;
To_Addr.sin_port=htons( m_SendPort ); //端口
if( strlen( m_SendIp ) <1 )
{
//提示出错
return false;
}
To_Addr.sin_addr.S_un.S_addr=inet_addr( m_SendIp );//发送IP
if( To_Addr.sin_addr.S_un.S_addr==INADDR_NONE )
{
//提示出错 return false;
}
if( strlen(buffer) <1 )
{
//提示出错
return false;
}

int val=sendto( m_SendSock, buffer, inLength, 0, (sockaddr*)&To_Addr, sizeof(To_Addr) );
if( val == SOCKET_ERROR )
{
//提示出错
return false;
}

return true;
}
void __fastcall TForm1::Button1Click(TObject *Sender)
{
InitSendSock();
SendData(2018,"192.168.1.112","Hello",6);
}
//---------------------------------------------
为什么不行呢？奇怪了

[ooily]

ding

[jxw1987628]

#include <winsock2.h>
#include <windows.h>
#include <iostream>
using namespace std;

unsigned long __stdcall ThreadFunc(void* pParam);
SOCKET      m_RcvSock;    //接收用的SOCK
SOCKET      m_SendSock;    //发送用的SOCK
bool InitRcvSock(DWORD m_RcvPort)
{
    WSADATA data;
    int ret=WSAStartup(MAKEWORD(2,2), &data );
    m_RcvSock=socket( AF_INET, SOCK_DGRAM,  IPPROTO_UDP );

    struct sockaddr_in Local_Addr;
    ZeroMemory( &Local_Addr, sizeof(Local_Addr) );
    Local_Addr.sin_family=AF_INET;
    Local_Addr.sin_port=htons( m_RcvPort );//接收端口
    Local_Addr.sin_addr.S_un.S_addr=htonl(INADDR_ANY);
    ret=bind( m_RcvSock, (sockaddr*)&Local_Addr, sizeof(struct sockaddr_in) );
    if( ret==SOCKET_ERROR )
    {
    	cout<<" bind error ...."<<GetLastError()<<endl;
        closesocket( m_RcvSock );
      	system("pause");
    }
    return true;
} 
//---------------------- 
void Recving( ) 
{
    struct sockaddr_in  Addr_From;
    ZeroMemory( &Addr_From, sizeof(Addr_From) );
    char buffer[1024]={0};
    long bytes = 0;
    int i= sizeof(Addr_From);
    bool m_IsRecving = true;

    while( m_IsRecving )
    {
        bytes = recvfrom( m_RcvSock, (char*)buffer, 1024, 0, (sockaddr*)&Addr_From, &i );
        if( (bytes == SOCKET_ERROR) || (bytes == 0) )
        {
            if( bytes == SOCKET_ERROR )
                cout<<"socket error!"<<endl;
            if( bytes==0 )
                cout<<"server closed !"<<endl;
            m_IsRecving = false;
        }
        else
        {
            cout<<bytes<<" bytes receved."<<endl;
            cout<<"content:"<<buffer<<endl;
        }
    }
}

bool InitSendSock( void )//初始化
{
    WSADATA data; 
    int ret=WSAStartup(MAKEWORD(2,2), &data );
    m_SendSock=socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
    return true;
} 

//------------------------------------------------------------------------------ 
bool SendData(DWORD m_SendPort ,char * m_SendIp ,const char *buffer, long inLength ) //发送
{
    struct sockaddr_in To_Addr;
    ZeroMemory( &To_Addr, sizeof(To_Addr) );
    To_Addr.sin_family=AF_INET;
    To_Addr.sin_port=htons( m_SendPort );  //端口
    To_Addr.sin_addr.S_un.S_addr=inet_addr( m_SendIp );//发送IP
    int val=sendto( m_SendSock, buffer, inLength, 0, (sockaddr*)&To_Addr, sizeof(To_Addr) );
    if( val == SOCKET_ERROR )
    { 
        //提示出错
        cout<<" send error "<<WSAGetLastError()<<endl;
    }
    return true;
}

unsigned long __stdcall ThreadFunc(void* pParam)
{
 	Recving();
    return 0;
}

int main(int argc, char* argv[])
{

    InitRcvSock(12000);
    InitSendSock();
    /*
      为了便于你观察结果，我们将服务器程序和客户端程序写成了1个程序
      我们启动一个线程，在线程里面接收数据并显示，因为recvfrom函数是
      阻塞的，所以必须弄1个线程，以便我们后面可以发送数据
    */
    ::CreateThread(0,0,ThreadFunc,0,false,0);
    SendData(12000,"127.0.0.1","helloworld",11);
    getchar();
    return 0;
}

//---------------------------------------------------------------------------
/*
   首先，我估计你的代码是你自己做了一个类，封装了socket api，可能你是想在GUI

程序中来测试你这个程序  。但这里为了说明问题，我把他修改为console Wizrd了

我摈弃了你代码中关于socket错误的部分代码，以及一些不好的代码语句，但依然保留你

原有的风格，你的程序主干我没有改变。

*/