Brief Description about Project –
This project uses message queue communication service of Linux . This project uses a file handling concept of C programming language to store login ID’s and Password’s in database. It uses a message queue to communicate between two clients.
Understand Message Queue Communication –
CODE FOR PROJECT –
#include<stdio.h>
#include<stdlib.h>
#include<sys/ipc.h>
#include<sys/types.h>
#include<sys/msg.h>
#include<unistd.h>
#include<string.h>
struct whatsapp
{
char id[20];
char pswd[20];
};
struct whatsapp user1;
void login(FILE *);
void send();
void rec();
void signup(FILE *);
struct msgqbuf
{
long mtype;
char mtext[50];
};
typedef struct msgqbuf msgque;
int main()
{
int i,z;
FILE *fp;
char ch;
char str[50];
fp=fopen("database","r+");
if(fp==NULL)
{
perror("\nError in opening file...\n");
exit(1);
}
do
{
system("clear");
printf("\n************************\n* Linux Chat Messenger *\n************************\n\n");
printf("Enter Choices:\n\n1.Login\n\n2.New User\n\n");
scanf("%d",&i);
switch(i)
{
case 1:
rewind(fp);
login(fp);
break;
case 2:
signup(fp);
break;
default:
printf("\nInvalid Options\n");
}
sleep(5);
system("clear");
printf("\nDo U wish to continue chat....\nY:Yes\nN:No\n");
scanf(" %c",&ch);
}while(ch=='y'||ch=='Y');
fclose(fp);
return 0;
}
void send()
{
int msgqid,siz,siz1,i,client_id,ans;
char ch,client_[2];
msgque q,q1;
printf("\nEnter Client ID to chat:-\n");
printf("Client ID's are:\n1.ID-0 Name-Mohit\n2.ID-1 Name-Manoj\n");
scanf("%d",&client_id);
switch(client_id)
{
case 0:
msgqid=msgget(1234,0666|IPC_CREAT);
if(msgqid==-1)
{
perror("\nMsg Queue Can't Create...\n");
exit(1);
}
else
{
printf("\nMsg Queue Created Successfully...\n");
q.mtype=0;
send_again: printf("\nEnter Message:\n");
scanf("%s",q.mtext);
while(strcmp(q.mtext,"bye")!=0)
{
siz=msgsnd(msgqid,q.mtext,strlen(q.mtext),0);
if(siz==-1)
{
perror("\nMsg Sending Failed....\n");
exit(1);
}
else if(siz==0)
{
printf("\nMsg Sent Successfully...\n");
printf("\nWhat do you want now?\n1.Send\n2.Recieve\n");
scanf("%d",&ans);
if(ans==1)
{
goto send_again;
}
else
{
rec();
}
}
}
}
// rec();
break;
case 1:
msgqid=msgget(1234,0666|IPC_CREAT);
if(msgqid==-1)
{
perror("\nMsg Queue Can't Create...\n");
exit(1);
}
else
{
printf("\nMsg Queue Created Successfully...\n");
q.mtype=0;
again_send2: printf("\nEnter Message:\n");
scanf("%s",q.mtext);
while(strcmp(q.mtext,"bye")!=0)
{
siz=msgsnd(msgqid,q.mtext,strlen(q.mtext),0);
if(siz==-1)
{
perror("\nMsg Sending Failed....\n");
exit(1);
}
else if(siz==0)
{
printf("\nMsg Sent Successfully...\n");
printf("\nWhat do you want now?\n1.Send\n2.Recieve\n");
scanf("%d",&ans);
if(ans==1)
{
goto again_send2;
}
else
{
rec();
}
}
}
}
break;
default:
break;
}
}
void rec()
{
int msgqid,siz,siz1,i,ans;
char ch;
msgque q,q1;
msgqid=msgget(1234,0666|IPC_CREAT);
if(msgqid==-1)
{
perror("\nMsg Queue Can't Create...\n");
exit(1);
}
else
{
printf("\nMsg Queue Created Successfully...\n");
q.mtype=0;
printf("\nNow reading\n");
while(strcmp(q.mtext,"bye")!=0)
{
siz=msgrcv(msgqid,q.mtext,BUFSIZ,0,0);
if(siz1==-1)
{
perror("\nMsg Recieve Error\n");
exit(1);
}
else
{
printf("\nMsg Recieved Successfully...\n");
printf("\nMsg:%s\tSize:%d\n",q.mtext,siz);
printf("\nWhat do you want now?\n1.Send\n2.Recieve\n");
scanf("%d",&ans);
if(ans==1)
{
send();
}
else
{
rec();
}
}
}
}
}
void login(FILE *fp)
{
int k,z;
char u[20],p[20],ch;
int n=0;
system("clear");
printf("\nLogin into your messenger\n");
printf("\nWarning:3 attempts only\n");
login:
fread(&user1,sizeof(user1),1,fp);
printf("\nEnter User ID:");
scanf("%s",u);
printf("\nEnter Password:");
scanf("%s",p);
if(strcmp(user1.id,u)==0 && strcmp(user1.pswd,p)==0)
{
printf("Congratulations!");
sleep(1);
system("clear");
printf("\nChoose what to do???\n1:Send a Message\n2.Read a message\n");
scanf("%d",&z);
if(z==1)
send();
else if(z=2)
rec();
}
else
{
while(n<2)
{
n++;
printf("\nIncorrect user-id or password,%d trials left.\n",3-n);
goto login;
if(n==3)
{
printf("\nTry Later\n");
break;
}
}
}
}
void signup(FILE *fp)
{
int st=0,num=0,i,chr=0;
again:
num=0;
chr=0;
printf("\nEnter Mobile Number as a User ID to Create:\n");
scanf("%s",&user1.id);
for(i=1;i<strlen(user1.id);i++)
{
if(user1.id[i]>'0' && user1.id[i]<='9')
{
num=1;
}
else if(user1.id[i]>='a' && user1.id[i]<='z' || user1.id[i]>='A' && user1.id[i]<='Z')
{
chr=1;
}
}
if(chr==1 && num==1)
{
goto again;
}
else if(chr==1)
{
goto again;
}
else
{
st=1;
}
printf("\nEnter password to Create:\n");
scanf("%s",&user1.pswd);
st=2;
printf("\nCongratulations.....Your registration is Completed...Thank You!!\n\n \nYou are being redirected to Main Portal.....\n");
switch(st)
{
case 2:
fwrite(&user1,sizeof(user1),1,fp);
printf("\nRecord saved successfully\n");
break;
default:
perror("\nData can't be saved because of wrong entries.\n");
exit(1);
}
sleep(1);
}
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