file transfer between two computers using communication ports. - Hardware Interaction Through C Source Code in C

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Home » C Home » Hardware Interaction Through C Home » file transfer between two computers using communication ports.

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Title	file transfer between two computers using communication ports.
Author	sanjoy saha and avik debnath
Author Email	sanjay432 [at] indiatimes.com
Description	To transfer text and html files between two computers using three wire connections between com ports.a little modification can also transfer image and multimedia files.
Category	C » Hardware Interaction Through C
Hits	397403
Code	Select and Copy the Code
#include<stdio.h> #include<conio.h> #include<process.h> #include<dos.h> #include<graphics.h> #include<start.h> void baudset(long); void comparm(int,int,int); int port_address; union REGS i,o; void main() { int gd=DETECT,gm,maxx,maxy,x,y,button,ex=1,c,v=1,run=1; FILE f; char chr; char fname; int result,status,choice,port; unsigned int fstat,mstat,lstat; st(); while(1) { initgraph(&gd,&gm," "); cleardevice(); maxx=getmaxx(); maxy=getmaxy(); setbkcolor(9); if(run==1) { gotoxy(32,1); printf("PORT INACTIVE"); run++; } else { gotoxy(32,1); printf("PORT ACTIVATED"); } choice=0; rectangle(0,20,maxx,maxy); setviewport(1,5,maxx-1,maxy-1,1); if(initmouse()==0) { closegraph(); restorecrtmode(); outtextxy(100,100,"mouse driver not loaded"); exit(1); } restrictmouseptr(1,20,maxx-1,maxy-1); showmouseptr(); setcolor(6); outtextxy(115,30,"PROGRAM TO TRANSFER FILES BETWEEN TWO COMPUTERS"); setcolor(3); outtextxy(430,45,"ver 1.0 "); setcolor(14); outtextxy(170,45,"Sanjoy Saha & Avik Debnath"); setcolor(10); outtextxy(200,100,"1 : SEND FILE"); outtextxy(200,120,"2 : RECIEVE FILE"); outtextxy(200,140,"3 : EXIT"); outtextxy(200,175,"enter your choice (1,2 or 3)::"); rectangle(195,95,210,110); rectangle(195,115,210,130); rectangle(195,135,210,150); setcolor(13); outtextxy(20,450,"PRESS 'F1' TO ACTIVATE THE PORTS"); setcolor(9); while(v==1) { if(kbhit()) { chr=getch(); if(chr==0) { chr=getch(); c=(int)chr; if(c==59) { gotoxy(31,1); printf("PORT ACTIVATED"); v=2; break; } } } } while(ex==1) { getmousepos(&button,&x,&y); gotoxy(5,1); (button & 1)== 1 ? printf("DOWN"):printf("UP"); gotoxy(20,1); (button & 2) == 2 ? printf("DOWN"):printf("UP"); gotoxy(65,1); printf("X=%03d Y=%03d",x,y); if((button & 1)==1) { if((x>=195 && x<=210) && (y>=95 && y<=110)) { choice=1; } if((x>=195 && x<=210) && (y>=115 && y<= 130)) { choice=2; } if((x>=195 && x<=210) && (y>=135 && y<=150)) { choice=3; } } if(choice==1 \|\| choice==2 \|\| choice==3) goto sos; if(kbhit()) { goto sob; } } fflush(stdin); sob: gotoxy(60,12); scanf("%d",&choice); sos: switch(choice) { case 1: { setcolor(12); outtextxy(10,205,"select port (1: com1 2: com2) ::"); rectangle(470,200,485,215); rectangle(510,200,525,215); outtextxy(474,203,"1"); outtextxy(514,203,"2"); gotoxy(50,14); scanf("%d",&port); if(port==1) port_address=0x3F8; else port_address=0x2F8; baudset((long)2400); comparm(0,1,8); outport(port_address+4,1\|2); outtextxy(10,240,"enter the name of file to be sent::"); gotoxy(50,16); scanf("%15s",&fname); f=fopen(&fname,"r"); if(f==NULL) { setcolor(4); outtextxy(10,300,"* file do not exist "); setcolor(6); outtextxy(10,320,"hit any key to continue........"); getch(); break; } closegraph(); restorecrtmode(); clrscr(); textcolor(2); for(;;) { if(kbhit()) { if(getch()==27) break; } lstat=inportb(port_address+5); if(!(lstat & 32)) continue; else { chr=fgetc(f); } if(chr==EOF) { cprintf("FILE TRANSMITTED "); outportb(port_address,EOF); getch(); break; } outportb(port_address,chr); putchar(chr); } fclose(f); break; } case 2: { setcolor(12); outtextxy(10,205,"select port (1: com1 2: com2) ::"); gotoxy(50,14); scanf("%d",&port); if(port==1) port_address=0x3F8; else port_address=0x2F8; baudset((long)2400); comparm(0,1,8); outportb(port_address+4,1\|2); textcolor(4); outtextxy(10,240,"save as file name::"); gotoxy(50,16); scanf("%15s",&fname); f=fopen(&fname,"w"); if(f==NULL) { setcolor(4); outtextxy(10,300," cannot open file "); break; } closegraph(); restorecrtmode(); clrscr(); textcolor(4); cprintf("waiting for i/p "); textcolor(7); cprintf("press esc for exit "); gotoxy(1,4); for(;;) { if(kbhit()) { if(getch()==27) break; } fstat=inportb(port_address+5); if(fstat & 2) cprintf("over run time error "); if(fstat & 4) cprintf("parity error"); if(fstat & 8) cprintf("framing error "); if(fstat & 16) cprintf("break recieved "); if(!(fstat & 1)) continue; chr=inportb(port_address); if(chr==EOF) { textcolor(2); cprintf("FILE RECIEVED "); exit(0); } putchar(chr); fputc(chr,f); } outportb(port_address+4,0); fclose(f); break; } case 3: exit(0); default: sound(900); delay(10000); nosound(); break; } } } void baudset(long baudrate) { unsigned int divisor; unsigned char lsb,msb; divisor=1152001/baudrate; msb=divisor>>8; lsb=(divisor<<8)>>8; outportb(port_address+3,128); outportb(port_address,lsb); outportb(port_address+1,msb); } void comparm(int parity,int stop,int databit) { int parmbyte; parmbyte=databit-5; if(stop==2) parmbyte\|=4; if(parity!=0) parmbyte\|=8; if(parity==2) parmbyte\|=16; outportb(port_address+3,parmbyte); } / MOUSE WORK / initmouse() { i.x.ax=0; int86(0x33,&i,&o); return(o.x.ax); } showmouseptr() { i.x.ax=1; int86(0x33,&i,&o); } restrictmouseptr(int x1,int y1,int x2,int y2) { i.x.ax=7; i.x.cx=x1; i.x.dx=x2; int86(0x33,&i,&o); i.x.ax=8; i.x.cx=y1; i.x.dx=y2; int86(0x33,&i,&o); } getmousepos(int button,int x,int y) { i.x.ax=3; int86(0x33,&i,&o); button=o.x.bx; x=o.x.cx; *y=o.x.dx; }

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