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分享【急问】哪位大神教我下，在MFC下如何检查某个IP地址是否是连接状态？ [问题点数：30分]
如题，有没有简单快速的方法，之前没做过这方便的，有好的方法给分啦
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kakabulusi 2017-06-08
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检查IP地址是否在线，和是否连接到本机是不同的两个概念。
建议撸主先了解清楚了需求再提问。
赵4老师 2017-05-05
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参考《Unix编程艺术》
正经的董同学 2017-05-04
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楼上的大佬们能讲下ping的缺陷吗,为何还需要开进程设缓冲区呢?担心ping对程序主线程有影响可以开个线程来ping,这样有什么缺陷呢?
示申○言舌 2017-04-28
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管道技术请自行百度，下面的供参考。很久以前写的。
启动一个Windows控制台进程，并将其输出转向。
截获目标进程输出的方式：
1、等待目标进程结束后读取缓冲区，并更新。
2、随时读取缓冲区并追加更新到指定输出。（但每次读之前需要清除缓冲区，否则输出重叠）
unsigned long SomeThread( LPVOID pVoid )
{
char Buffer [ 4096 ];
DWORD dwExit = 1;
HANDLE hReadPipe = NULL;
HANDLE hWritePipe = NULL;
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof( SECURITY_ATTRIBUTES );
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
CString szCurPath = pDlg->GetFilePath();
STARTUPINFO StartupInfo = { sizeof(StartupInfo) };
PROCESS_INFORMATION ProcessInfo = { 0 };
TCHAR szCommandLine[ 256 ]; // = _T("c:\\windows\\system32\\cmd.exe /c dir");
_tcscpy_s( szCommandLine, 256, ( szCurPath + _T("VPNRel.EXE")));
ZeroMemory( Buffer, 4096 );
if( ! CreatePipe( &hReadPipe, &hWritePipe, &sa, 0 ))
{
goto EXIT_THREAD;
}
StartupInfo.cb = sizeof( STARTUPINFO );
GetStartupInfo( &StartupInfo );
StartupInfo.hStdError = hWritePipe;
StartupInfo.hStdOutput = hWritePipe;
StartupInfo.wShowWindow = SW_HIDE;
StartupInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
if( ! CreateProcess( NULL, szCommandLine, NULL, NULL, TRUE, 0, NULL, szCurPath, &StartupInfo, &ProcessInfo ))
{
goto EXIT_THREAD;
}
// - 创建目标进程成功，开始等待目标进程结束并监视其输出
// ----------------------------目标进程输出-------------------------------
CloseHandle( hWritePipe );
hWritePipe = NULL;
while( dwExit )
{
DWORD dwWait = WaitForSingleObject( ProcessInfo.hProcess, 200 );
DWORD dwReaded;
ZeroMemory( Buffer, sizeof( Buffer )); // Cleaer Buffer.
if( ReadFile( hReadPipe, Buffer, 4095, &dwReaded, NULL ) == false )
{
if( dwWait == WAIT_TIMEOUT )
continue;
else
break;
}
else
{
#ifdef _UNICODE
TCHAR szWBuffer[ 4096 ];
ZeroMemory( szWBuffer, sizeof( TCHAR ) * 4096 );
MultiByteToWideChar( CP_ACP, 0, Buffer, -1, szWBuffer, 4095 );
APPEND( szWBuffer ); // == m_strSomeEdit += szWBuffer; UpdateData( false );
#else
APPEND( Buffer ); // == m_strSomeEdit += Buffer; UpdateData( false );
#endif
}
if( dwWait == WAIT_OBJECT_0 )
break;
}
//--------------------------目标进程已经结束------------------------------
EXIT_THREAD:
if( ProcessInfo.hProcess != NULL )
CloseHandle( ProcessInfo.hProcess );
if( hWritePipe != NULL )
CloseHandle( hWritePipe );
if( hReadPipe != NULL )
CloseHandle( hReadPipe );
pDlg->m_hThread = NULL;
return 0;
}
示申○言舌 2017-04-28
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正解在这里：
方案1、自己写ping函数。这样成功或失败就很容易分析了吧。
方案2、如果你非要用CMD的ping命令，那么，给你的建议是使用管道技术。就是创建一个缓冲区，将子进程ping命令的输出转向到你的缓冲区，然后分析缓冲区内的文本即可。同时还可以隐藏ping窗口。
daydayup.wiki 2017-04-28
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管道技术加上createprocess可以解决
daydayup.wiki 2017-04-28
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这是模拟Ping的底层实现吗
daydayup.wiki 2017-04-28
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管道技术请自行百度，下面的供参考。很久以前写的。
启动一个Windows控制台进程，并将其输出转向。
截获目标进程输出的方式：
1、等待目标进程结束后读取缓冲区，并更新。
2、随时读取缓冲区并追加更新到指定输出。（但每次读之前需要清除缓冲区，否则输出重叠）
unsigned long SomeThread( LPVOID pVoid )
{
char Buffer [ 4096 ];
DWORD dwExit = 1;
HANDLE hReadPipe = NULL;
HANDLE hWritePipe = NULL;
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof( SECURITY_ATTRIBUTES );
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
CString szCurPath = pDlg->GetFilePath();
STARTUPINFO StartupInfo = { sizeof(StartupInfo) };
PROCESS_INFORMATION ProcessInfo = { 0 };
TCHAR szCommandLine[ 256 ]; // = _T("c:\\windows\\system32\\cmd.exe /c dir");
_tcscpy_s( szCommandLine, 256, ( szCurPath + _T("VPNRel.EXE")));
ZeroMemory( Buffer, 4096 );
if( ! CreatePipe( &hReadPipe, &hWritePipe, &sa, 0 ))
{
goto EXIT_THREAD;
}
StartupInfo.cb = sizeof( STARTUPINFO );
GetStartupInfo( &StartupInfo );
StartupInfo.hStdError = hWritePipe;
StartupInfo.hStdOutput = hWritePipe;
StartupInfo.wShowWindow = SW_HIDE;
StartupInfo.dwFlags = STARTF_USESHOWWINDOW | STARTF_USESTDHANDLES;
if( ! CreateProcess( NULL, szCommandLine, NULL, NULL, TRUE, 0, NULL, szCurPath, &StartupInfo, &ProcessInfo ))
{
goto EXIT_THREAD;
}
// - 创建目标进程成功，开始等待目标进程结束并监视其输出
// ----------------------------目标进程输出-------------------------------
CloseHandle( hWritePipe );
hWritePipe = NULL;
while( dwExit )
{
DWORD dwWait = WaitForSingleObject( ProcessInfo.hProcess, 200 );
DWORD dwReaded;
ZeroMemory( Buffer, sizeof( Buffer )); // Cleaer Buffer.
if( ReadFile( hReadPipe, Buffer, 4095, &dwReaded, NULL ) == false )
{
if( dwWait == WAIT_TIMEOUT )
continue;
else
break;
}
else
{
#ifdef _UNICODE
TCHAR szWBuffer[ 4096 ];
ZeroMemory( szWBuffer, sizeof( TCHAR ) * 4096 );
MultiByteToWideChar( CP_ACP, 0, Buffer, -1, szWBuffer, 4095 );
APPEND( szWBuffer ); // == m_strSomeEdit += szWBuffer; UpdateData( false );
#else
APPEND( Buffer ); // == m_strSomeEdit += Buffer; UpdateData( false );
#endif
}
if( dwWait == WAIT_OBJECT_0 )
break;
}
//--------------------------目标进程已经结束------------------------------
EXIT_THREAD:
if( ProcessInfo.hProcess != NULL )
CloseHandle( ProcessInfo.hProcess );
if( hWritePipe != NULL )
CloseHandle( hWritePipe );
if( hReadPipe != NULL )
CloseHandle( hReadPipe );
pDlg->m_hThread = NULL;
return 0;
}
赵4老师 2017-04-28
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仅供参考：
#include <windows.h>
#include <stdio.h>
#include <string.h>
char YN(int k) {
FILE *f;
char fn[40];
char ln[80];
char yn;
int n;
yn='N';
sprintf(fn,"d:\\ping%d.txt",k);
f=fopen(fn,"r");
if (NULL!=f) {
n=0;
while (1) {
if (NULL==fgets(ln,80,f)) break;//
if (strstr(ln,"ms ")) {
yn='Y';
break;//
}
n++;
if (n>=4) break;//
}
fclose(f);
}
return yn;
}
void main(int argc,char **argv) {
char cmdstr[256];
int i;
int IP[3];
char c;
if (argc<2) {
USAGE:
printf("Usage example:\n %s 192.168.60.\nto test 192.168.60.1-254\n",argv[0]);
return;
}
if (4==sscanf(argv[1],"%d.%d.%d%c",&IP[0],&IP[1],&IP[2],&c)) {
if (0<=IP[0] && IP[0]<=255
&& 0<=IP[1] && IP[1]<=255
&& 0<=IP[2] && IP[2]<=255
&& '.'==c) {
for (i=1;i<255;i++) {
sprintf(cmdstr,"cmd /c ping %s%d -n 1 -w 1000 >d:\\ping%d.txt",argv[1],i,i);
WinExec(cmdstr,SW_HIDE);
}
Sleep(3000);
for (i=1;i<255;i++) {
printf("%c %s%d\n",YN(i),argv[1],i);
}
Sleep(3000);
WinExec("cmd /c del /q d:\\ping*.txt",SW_HIDE);
} else goto USAGE;
} else goto USAGE;
}
三岁、就很帅 2017-04-28
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int i=0;
NetworkTest *networktest = (NetworkTest *)pParam;
networktest->m_pinglist.ResetContent();
// 创建ICMP回显请求包
// char *ICMPPack;
// ICMPPack=new char[networktest->packet];
while (networktest->m_stop)//networktest->m_index
{
char ICMPPack[1024] = {0} ;
PICMP_HEADER pICMPHeader = (PICMP_HEADER)ICMPPack ;
pICMPHeader->bType = 8 ;
pICMPHeader->bCode = 0 ;
pICMPHeader->nId = (USHORT)::GetCurrentProcessId() ;
pICMPHeader->nCheckSum = 0 ;
pICMPHeader->nTimeStamp = 0 ;
memset ( (&ICMPPack[ICMP_HEADER_SIZE]), 'E',ICMP_HEADER_SIZE + networktest->m_packet) ; // 填充数据部分，内容任意
// 初始化WinSock库
WORD wVersionRequested = MAKEWORD( 2, 2 );
WSADATA wsaData;
if ( WSAStartup( wVersionRequested, &wsaData ) != 0 )
return FALSE ;
// 创建原始套接字
SOCKET RawSock = socket ( AF_INET, SOCK_RAW, IPPROTO_ICMP ) ;
if ( RawSock == INVALID_SOCKET )
{
return FALSE ;
}
// 设置接收超时为1秒
int nTimeout = networktest->m_time ;
int ret = ::setsockopt ( RawSock, SOL_SOCKET,SO_RCVTIMEO, (char*)&nTimeout, sizeof(nTimeout));
char szRecvBuf [ DEF_BUF_SIZE] ;
SOCKADDR_IN SourSockAddr ;
SOCKADDR_IN DestSockAddr ;
DestSockAddr.sin_family = AF_INET;
inet_addr(networktest->szDestIp);
DestSockAddr.sin_addr.s_addr = inet_addr(networktest->szDestIp) ;
DestSockAddr.sin_port = htons ( 0 ) ;
char m_str_start[128];
if(networktest->index_stop==true)
{
networktest->m_pinglist.ResetContent();
wsprintf(m_str_start,"正在ping [%s]",networktest->szDestIp);
networktest->m_pinglist.AddString(m_str_start);
networktest->index_stop=false;
}
pICMPHeader->nCheckSum = 0 ; // 初始时校验值为0
pICMPHeader->nSequence = i ; // 序号
pICMPHeader->nTimeStamp = ::GetTickCount() ;// 当前时间
// 计算校验值，校验值要在ICMP数据报创建完才能计算
pICMPHeader->nCheckSum = networktest->GetCheckSum ( (LPBYTE)ICMPPack, ICMP_HEADER_SIZE + networktest->m_packet ) ;//
// 发送ICMP数据包
int nRet = ::sendto ( RawSock, ICMPPack, ICMP_HEADER_SIZE + networktest->m_packet,0,(SOCKADDR*)&DestSockAddr, sizeof(DestSockAddr) ) ;//
if ( nRet == SOCKET_ERROR )
{
networktest->m_pinglist.AddString ( "sendto error!\n" ) ;
return FALSE ;
}
// 接收ICMP响应
int nLen = sizeof(SourSockAddr) ;
nRet = ::recvfrom ( RawSock, szRecvBuf, DEF_BUF_SIZE,0,(SOCKADDR*)&SourSockAddr, &nLen ) ;
if ( nRet == SOCKET_ERROR )
{
if ( ::WSAGetLastError() == WSAETIMEDOUT )
{
networktest->m_pinglist.AddString ( "Request Timeout\n" ) ;
continue ;
}
else
{
networktest->m_pinglist.AddString ( "recvfrom error!\n" ) ;
return FALSE ;
}
}
// 计算ICMP数据报的时间差
int nTime = ::GetTickCount() - pICMPHeader->nTimeStamp ;
int nRealSize = nRet - IP_HEADER_SIZE - ICMP_HEADER_SIZE ;
if ( nRealSize < 0 )
{
networktest->m_pinglist.AddString ( "To less recv bytes!\n" );
continue ;
}
// 检测是否当前所发出的ICMP响应包
PICMP_HEADER pRecvHeader = (PICMP_HEADER)(szRecvBuf+IP_HEADER_SIZE);
CString str_all;
CString m_TTL;
if(networktest->m_check1.GetCheck())
{
m_TTL.Format("TTL=%d",nRet);
}
else
m_TTL="";
CString m_replaytime;
if(networktest->m_check2.GetCheck())
{
m_replaytime.Format("time=%dms ",nTime);
}
else
m_replaytime="";
CString m_packetsize;
if(networktest->m_check3.GetCheck())
{
m_packetsize.Format("bytes=%d ",nRealSize);
}
else
m_packetsize="";
CString m_ipreplay;
if(networktest->m_check4.GetCheck())
{
m_ipreplay.Format("replay[%d] from %s :",networktest->m_index,inet_ntoa(SourSockAddr.sin_addr));
}
else
m_ipreplay="";
str_all=m_ipreplay+m_packetsize+m_replaytime+m_TTL;
networktest->m_index++;
networktest->m_pinglist.AddString(str_all);
networktest->UpdateWindow();//立马刷新显示
Sleep(1000) ;//
i++;
closesocket(RawSock) ;
WSACleanup();
}//循环
三岁、就很帅 2017-04-28
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就是实现CMD命令模式下 发送ping 命令 接收回复的码
daydayup.wiki 2017-04-27
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不是，比如我要ping 192.168.1.1,怎么才能知道是ping通了还是没有ping通，要在mfc里实现
Eleven 2017-04-27
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netstat -n 这样的？
daydayup.wiki 2017-04-27
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我是MFC新手，看网上说可以用SHELLEXEC调用Ping来做这个，不知道具体怎么实现
