spawnvp does not work

spawnvp does not work

Post by ehab_aziz2 » Sun, 18 Apr 2004 09:02:13


I wrote that program but spawnvp dows not call the exe files hello1,hello2!!!

#include <stdio.h>
#include <conio.h>
#include <process.h>

//Tv Rental system menu version 1
int user_selection();
void display_menu();
void call_program(int option,char *argv[]);
int main(int ,char *argv[])
{
int option;
do
{
display_menu();
option=user_selection();
if (option!=7) //Exit
call_program(option,argv);
}
while (option!=7);
return 0;
}


void display_menu()
{
clrscr();
printf("1 hello1");
printf("\n2 hello2");
printf("\n3 exit");
}

int user_selection()
{
int opt;
printf("\n Enter required option(1-3) : ");
scanf("%1d",&opt);
return (opt);
}

void call_program(int opt,char *argv[])
{
void delay();
switch(opt)
{
case 1:
spawnvp(0,"hello1.exe",argv);
delay();
break;
case 2:
spawnvp(0,"hello2.exe",argv);
delay();
break;
default:
printf("\n incoreect input");
delay();
exit(0);
}
}
void delay()
{
int i;
for (i=0;i<20000;i++);
}
 
 
 

spawnvp does not work

Post by Jeremy Pai » Tue, 20 Apr 2004 12:15:08

you haven't assigned 'opt' a value. it's value is undetermined, but i'm
willing to bet it's not 1 or 2. seeing how you're asking the user to input
a digit, you will most likely want to get the user request by calling
"fgetc" or something similar. basically you'd replace the "scanf" call with
the "fgetc" call. the return value is the "int" value of the character
input, so you'll either have to convert it to the actual digit value or
change the "switch" statement to include the character case values, such as:

case '1':
...

case '2':
...




I wrote that program but spawnvp dows not call the exe files
hello1,hello2!!!

#include <stdio.h>
#include <conio.h>
#include <process.h>

//Tv Rental system menu version 1
int user_selection();
void display_menu();
void call_program(int option,char *argv[]);
int main(int ,char *argv[])
{
int option;
do
{
display_menu();
option=user_selection();
if (option!=7) //Exit
call_program(option,argv);
}
while (option!=7);
return 0;
}


void display_menu()
{
clrscr();
printf("1 hello1");
printf("\n2 hello2");
printf("\n3 exit");
}

int user_selection()
{
int opt;
printf("\n Enter required option(1-3) : ");
scanf("%1d",&opt);
return (opt);
}

void call_program(int opt,char *argv[])
{
void delay();
switch(opt)
{
case 1:
spawnvp(0,"hello1.exe",argv);
delay();
break;
case 2:
spawnvp(0,"hello2.exe",argv);
delay();
break;
default:
printf("\n incoreect input");
delay();
exit(0);
}
}
void delay()
{
int i;
for (i=0;i<20000;i++);
}

 
 
 

spawnvp does not work

Post by ehab_aziz2 » Sat, 24 Apr 2004 22:29:15

I tried

It has no effests .!!!