使用纯 Win32 API 编程实现Winpcap 封包捕获的第一个例子

先上代码；

/*------------------------------------------------------------
   win32, Winpcap, by bobo, 2018-09-09
  ------------------------------------------------------------*/

//#include <windows.h>
#include <pcap.h>

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
     static TCHAR szAppName[] = TEXT ("HelloWin") ;
     HWND         hwnd ;
     MSG          msg ;
     WNDCLASS     wndclass ;

     wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
     wndclass.lpfnWndProc   = WndProc ;
     wndclass.cbClsExtra    = 0 ;
     wndclass.cbWndExtra    = 0 ;
     wndclass.hInstance     = hInstance ;
     wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
     wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
     wndclass.lpszMenuName  = NULL ;
     wndclass.lpszClassName = szAppName ;

     if (!RegisterClass (&wndclass))
     {
          MessageBox (NULL, TEXT ("This program requires Windows NT!"), 
                      szAppName, MB_ICONERROR) ;
          return 0 ;
     }
     
     hwnd = CreateWindow (szAppName,                  // window class name
                          TEXT ("The Hello Winpcap"), // window caption
                          WS_OVERLAPPEDWINDOW,        // window style
                          CW_USEDEFAULT,              // initial x position
                          CW_USEDEFAULT,              // initial y position
                          800,              // initial x size
                          600,              // initial y size
                          NULL,                       // parent window handle
                          NULL,                       // window menu handle
                          hInstance,                  // program instance handle
                          NULL) ;                     // creation parameters
     
     ShowWindow (hwnd, iCmdShow) ;
     UpdateWindow (hwnd) ;
     
     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;
}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
     HDC         hdc ;
     PAINTSTRUCT ps ;
     RECT        rect ;
	 DWORD err;
	 pcap_if_t * allAdapters;
     pcap_if_t * adapter;
     char errorBuffer[PCAP_ERRBUF_SIZE];
	 int crtAdapter = 0;
     
     switch (message)
     {
     case WM_CREATE:
	  		  
		  return 0 ;
          
     case WM_PAINT:
          hdc = BeginPaint (hwnd, &ps) ;
          
          GetClientRect (hwnd, &rect) ;

		  if( pcap_findalldevs_ex( PCAP_SRC_IF_STRING, NULL, &allAdapters, errorBuffer ) == -1 )
		  {
			  DrawText (hdc, TEXT (errorBuffer), -1, &rect,DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;
			  return -1;
		  }
		  if( allAdapters == NULL )//不存在任何适配器
		  {
			  DrawText (hdc, TEXT ("No adapters found!"), -1, &rect,DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;
			  return 0;
		  }
		  
		  rect.top=5;
		  for( adapter = allAdapters; adapter != NULL; adapter = adapter->next)//遍历输入适配器信息(名称和描述信息)
		  {
			  DrawText (hdc, TEXT (adapter->name), -1, &rect,DT_SINGLELINE | DT_CENTER) ;
			  rect.top+=30;
			  DrawText (hdc, TEXT (adapter->description), -1, &rect,DT_SINGLELINE | DT_CENTER) ;
			  rect.top+=30;    // 每输出一行，Y坐标增加30
		  }
          
          EndPaint (hwnd, &ps) ;
          return 0 ;
          
     case WM_DESTROY:
		  pcap_freealldevs( allAdapters);  //释放适配器列表
          PostQuitMessage (0) ;
          return 0 ;
     }
     return DefWindowProc (hwnd, message, wParam, lParam) ;
}

代码是用Winpcap获取本机网卡列表；

开发环境是Win10；VC++ 6.0；

先要安装Winpcap的驱动和DLL；如果安装了Wireshark封包捕获工具，则Winpcap已经安装好；没有的话单独下载安装；

再下载Winpcap开发包，解压至某个目录；

编译程序要把Windows.h 注释掉；否则系统自带的Winsock2.h 和 Winpcap的头文件中定义的宏有冲突；一堆错误；

第一次运行，没有发现网卡；需要开启NPF服务；

获取到本机有8个网卡；

打开Wireshark软件看一下；Wireshark也获取到本机有8个网卡；其中包含一个VMWare虚拟机上的；

后面几个图是，添加包含文件路径，库文件路径，lib文件也要加到lib文件列表；

为了使用Winpcap的远程访问，必须在预处理器中加入HAVE_REMOTE；