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how to send message(data) from c to c#?

This is a discussion on how to send message(data) from c to c#? within the C# Programming forums, part of the General Programming Boards category; hello i wrote a simple programm in c and iwant to use c# for its gui(Graphic user interface) to show ...

  1. #1
    Registered User smahdi1991's Avatar
    Join Date
    Nov 2009
    Posts
    19

    how to send message(data) from c to c#?

    hello
    i wrote a simple programm in c and iwant to use c# for its gui(Graphic user interface) to show its data in C#.how can i do that ?
    here is my c code:
    Code:
    
    //////////////////////////////
    
    #include "stdio.h"
    #include "winsock2.h"   //need winsock for inet_ntoa and ntohs methods
    #include <string.h>
    #define HAVE_REMOTE
    #include "pcap.h"   //Winpcap :)
    
    #pragma comment(lib , "ws2_32.lib") //For winsock
    #pragma comment(lib , "wpcap.lib") //For winpcap
    
    //some packet processing functions
    void ProcessPacket(u_char* , int );
    void print_ethernet_header(u_char*);
    void PrintIpHeader(u_char*, int);
    void print_udp_packet(u_char*, int);
    
    //Ethernet Header
    typedef struct ethernet_header
    	{
    	UCHAR dest[6];//6byte
    	UCHAR source[6];//6byte
    	USHORT type;//2byte
    	} ETHER_HDR;
    
    //Ip header (v4)
    typedef struct ip_hdr
    	{// for BYTE_ORDER == __LITTLE_ENDIAN
    	unsigned char ip_header_len : 4; // 4-bit header length (in 32-bit words) normally=5 (Means 20 Bytes may be 24 also)
    	unsigned char ip_version : 4; // 4-bit IPv4 version
    
    
    	unsigned char ip_tos; // IP type of service
    	unsigned short ip_total_length; // Total length
    	unsigned short ip_id; // Unique identifier
    
    	unsigned short R_DF_MF_FragmentOffset;
    
    	unsigned char ip_ttl; // Time to live
    	unsigned char ip_protocol; // Protocol(TCP,UDP etc)
    	unsigned short ip_checksum; // IP checksum
    	unsigned char ipSource[4]; // Source address
    	unsigned char ipDestination[4]; // destination address
    	} IPV4_HDR;
    
    
    //UDP header
    typedef struct udp_hdr
    	{
    	unsigned short source_port; // Source port no.
    	unsigned short dest_port; // Dest. port no.
    	unsigned short udp_length; // Udp packet length
    	unsigned short udp_checksum; // Udp checksum (optional)
    	} UDP_HDR;
    
    int tcp = 0, udp = 0, icmp = 0, others = 0, igmp = 0, total = 0, i, j;
    
    ETHER_HDR *ethhdr;
    
    IPV4_HDR *iphdr;
    
    UDP_HDR *udpheader;
    
    u_char *data;
    
    int main()
    	{
    
    	unsigned int i;
    	unsigned int res;
    	unsigned int chosenNumber;
    	unsigned char  errbuf[PCAP_ERRBUF_SIZE], buffer[100];
    	unsigned char *pkt_data;
    	time_t seconds;
    	struct tm tbreak;
    	pcap_if_t *alldevs, *d;
    	pcap_t *fp;
    	struct pcap_pkthdr *header;
    
    
    	/* The user didn't provide a packet source: Retrieve the local device list */
    	if (pcap_findalldevs_ex(PCAP_SRC_IF_STRING, NULL, &alldevs, errbuf) == -1)
    		{
    	/*	printf("Error in pcap_findalldevs_ex: %s\n", errbuf);*/
    		return -1;
    		}
    
    	i = 0;
    	/* Print the list */
    	for (d = alldevs; d; d = d->next)
    		{
    		++i;
    		/*printf("%d. %s\n    ", ++i, d->name);
    
    		if (d->description)
    			{
    			printf(" (%s)\n", d->description);
    			}
    		else
    			{
    			printf(" (No description available)\n");
    			}*/
    		}
    
    	if (i == 0)
    		{
    		/*printf("No interfaces found! Exiting.\n");*/
    		return -1;
    		}
    
    	//printf("Enter the interface number you would like to sniff : ");
    	//scanf_s("%d", &chosenNumber);
    	chosenNumber = 1;
    
    	/* Jump to the selected adapter */
    	for (d = alldevs, i = 0; i < chosenNumber - 1; d = d->next, i++);
    
    	/* Open the device */
    	if ((fp = pcap_open(d->name,
    		100 /*snaplen*/,
    		PCAP_OPENFLAG_PROMISCUOUS /*flags*/,
    		20 /*read timeout*/,
    		NULL /* remote authentication */,
    		errbuf)
    		) == NULL)
    		{
    		return -1;
    		}
    
    	//read packets in a loop :)
    	while ((res = pcap_next_ex(fp, &header, &pkt_data)) >= 0)
    		{
    		if (res == 0)
    			{
    			// Timeout elapsed
    			continue;
    			}
    		seconds = header->ts.tv_sec;
    		localtime_s(&tbreak, &seconds);
    		strftime(buffer, 80, "%d-%b-%Y %I:%M:%S %p", &tbreak);
    
    
    		ProcessPacket(pkt_data, header->caplen);
    		}
    
    	if (res == -1)
    		{
    		return -1;
    		}
    
    	return 0;
    	}
    
    void ProcessPacket(u_char* Buffer, int Size)
    	{
    	//Ethernet header
    	ethhdr = (ETHER_HDR *)Buffer;
    	++total;
    
    	//Ip packets
    	if (ntohs(ethhdr->type) == 0x0800)
    		{
    		//ip header
    		iphdr = (IPV4_HDR *)(Buffer + sizeof(ETHER_HDR));
    
    		switch (iphdr->ip_protocol) //Check the Protocol and do accordingly...
    			{
    
    			case 17: //UDP Protocol
    				udp++;
    				print_udp_packet(Buffer, Size);
    				break;
    
    			default: //Some Other Protocol
    				others++;
    				break;
    			}
    		}
    
    	}
    
    /*
    Print the Ethernet header
    */
    void print_ethernet_header(u_char* buffer)
    	{
    	ETHER_HDR *eth = (ETHER_HDR *)buffer;
    	eth->type = ntohs(eth->type);
    
    	}
    
    /*
    Print the IP header for IP packets
    */
    void PrintIpHeader(unsigned char* Buffer, int Size)
    	{
    
    	unsigned short swap_R_DF_MF_FOffset;
    	int iphdrlen = 0;
    
    	iphdr = (IPV4_HDR *)(Buffer + sizeof(ETHER_HDR));
    	iphdrlen = iphdr->ip_header_len * 4;
    	swap_R_DF_MF_FOffset = ntohs(iphdr->R_DF_MF_FragmentOffset);
    
    	//print Ethernet header
    	print_ethernet_header(Buffer);
    
    
    	iphdr->ip_total_length=ntohs(iphdr->ip_total_length);
    	iphdr->ip_id=ntohs(iphdr->ip_id);
    	iphdr->ip_checksum= ntohs(iphdr->ip_checksum);
    	//printf(" |-Reserved bit  Flag : %d\n", (swap_R_DF_MF_FOffset & 0x8000) >> 15);//(swap_R_DF_MF_FOffset& 0x8000)>0 ? 1:0
    	//printf(" |-Dont Fragment Flag : %d\n", (swap_R_DF_MF_FOffset & 0x4000) >> 14);
    	//printf(" |-More Fragment Flag : %d\n", (swap_R_DF_MF_FOffset & 0x2000) > 13);
    	//printf(" |- Fragment Offset : %d\n", swap_R_DF_MF_FOffset & 0x1fff);
    	//printf(" |-TTL : %d\n", (unsigned int)iphdr->ip_ttl);
    	//printf(" |-Protocol : %d\n", (unsigned int)iphdr->ip_protocol);
    
    	
    	}
    
    
    /*
    Print the UDP header for UDP packets
    */
    void print_udp_packet(u_char *Buffer, int Size)
    	{
    	int iphdrlen = 0, data_size = 0;
    
    	iphdr = (IPV4_HDR *)(Buffer + sizeof(ETHER_HDR));
    
    		//print ip header
    		PrintIpHeader(Buffer, Size);
    		iphdrlen = iphdr->ip_header_len * 4;
    		udpheader = (UDP_HDR*)(Buffer + iphdrlen + sizeof(ETHER_HDR));   
    		data = (Buffer + sizeof(ETHER_HDR)+iphdrlen + sizeof(UDP_HDR));
    		data_size = (Size - sizeof(ETHER_HDR)-iphdrlen - sizeof(UDP_HDR));
    
    
    
    		udpheader->source_port=ntohs(udpheader->source_port);
    		udpheader->dest_port= ntohs(udpheader->dest_port);
    		udpheader->udp_length= ntohs(udpheader->udp_length);
    		udpheader->udp_checksum=ntohs(udpheader->udp_checksum);
    
    
    	}

  2. #2
    Registered User smahdi1991's Avatar
    Join Date
    Nov 2009
    Posts
    19
    explanation:
    i want to show each structures filed in a separate text box for example so far i can only print them in a console window in c .i don't know how i can send these to my c# application so that i can use them there.

  3. #3
    Registered User
    Join Date
    Oct 2006
    Posts
    2,502
    use a socket, or simply rewrite the udp socket code in c#.
    smahdi1991 likes this.
    Code:
    namespace life
    {
        const bool change = true;
    }

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