Running .EXEs From A String Path

[compman9902]

Hello, and thank you for your interest in this disscussion. Here is my problem: I need to be able to run .EXE files from my console-based application. Here is the biggest bump in the road: The path is in a string variable. How do I run it? Please post code. Thank you.

[Savage]

Hello, and thank you for your interest in this disscussion. Here is my problem: I need to be able to run .EXE files from my console-based application. Here is the biggest bump in the road: The path is in a string variable. How do I run it? Please post code. Thank you.

Take a look at exec* and spawn* functions families.

I'm prety sure that u can do this all by u self! ;)

Savage

[compman9902]

Take a look at exec* and spawn* functions families.

I'm prety sure that u can do this all by u self! ;)

Savage

Any particular direction you'd like to point me in?

[Savage]

Any particular direction you'd like to point me in?

Now,that depends on u:Do u wish that ur main programme terminate when another app is calld or not?

If u wish to terminate ur main programm use execlp,it allows u to serach for app in that directory specifed by path(e.g)

char *path="C:\\WIND OWS\\NOTEPAD.EX E;
execlp(path,pat h,NULL);

Savage

[compman9902]

Now,that depends on u:Do u wish that ur main programme terminate when another app is calld or not?

If u wish to terminate ur main programm use execlp,it allows u to serach for app in that directory specifed by path(e.g)

char *path="C:\\WIND OWS\\NOTEPAD.EX E;
execlp(path,pat h,NULL);

Savage

what include do I use?

[Savage]

what include do I use?

If u are using windows include process.h if u are using unix include unistd.h

Savage

[compman9902]

If u are using windows include process.h if u are using unix include unistd.h

Savage

This is just not working for me. Could you just point me tword a web tutorial for this command?

[nearestniladri2003]

Enable your program to load and run other files (child processes)

Use these execl... functions when you know how many separate arguments
you'll have:

Declaration:
int execl (char *path, char *arg0, ..., NULL);
int execle (char *path, char *arg0, ..., NULL, char **env);
int execlp (char *path, char *arg0, ...);
int execlpe(char *path, char *arg0, ..., NULL, char **env);

Use these execv... functions when you don't know in advance how many
separate arguments you will have:

Declaration:
int execv (char *path, char *argv[]);
int execve (char *path, char *argv[], char **env);
int execvp (char *path, char *argv[]);
int execvpe(char *path, char *argv[], char **env);

Remarks:
When an exec... call succeeds, the child process overlays the parent
process. There must be sufficient memory available for loading and executing
the child process.

The l, v, e, and p suffixes added to "exec" specify certain capabilities of
the exec... function.

Argument ³ What It Is/Does
path ³ File name of the called child process
argN ³ Argument pointer(s) passed as separate arguments
argv[N] ³ Argument pointer(s) passed as an array of pointers
env ³ Array of character pointers.

The exec... functions search for path using the
standard DOS search algorithm.

When an exec... function call is made, any open files remain open in the
child process.

Return Value:
On success, the functions do not return.
On error, the functions return -1 and set
errno to one of the following:
E2BIG Arg list too long
EACCES Permission denied
EMFILE Too many open files
ENOENT Path or file name not found
ENOEXEC Exec format error
ENOMEM Not enough core

***************
execv example
***************
#include <process.h>
#include <stdio.h>
#include <errno.h>

int main(int argc, char *argv[])
{
int i;

printf("Command line arguments:\n");
for (i=0; i < argc; i++)
printf("[%2d] : %s\n", i, argv[i]);

printf("About to exec child with arg1 arg2 ...\n");
execv("CHILD.EX E", argv);

perror("exec error");
exit(1);
return 0;
}

[compman9902]

Enable your program to load and run other files (child processes)

Use these execl... functions when you know how many separate arguments
you'll have:

Declaration:
int execl (char *path, char *arg0, ..., NULL);
int execle (char *path, char *arg0, ..., NULL, char **env);
int execlp (char *path, char *arg0, ...);
int execlpe(char *path, char *arg0, ..., NULL, char **env);

Use these execv... functions when you don't know in advance how many
separate arguments you will have:

Declaration:
int execv (char *path, char *argv[]);
int execve (char *path, char *argv[], char **env);
int execvp (char *path, char *argv[]);
int execvpe(char *path, char *argv[], char **env);

Remarks:
When an exec... call succeeds, the child process overlays the parent
process. There must be sufficient memory available for loading and executing
the child process.

The l, v, e, and p suffixes added to "exec" specify certain capabilities of
the exec... function.

Argument ³ What It Is/Does
path ³ File name of the called child process
argN ³ Argument pointer(s) passed as separate arguments
argv[N] ³ Argument pointer(s) passed as an array of pointers
env ³ Array of character pointers.

The exec... functions search for path using the
standard DOS search algorithm.

When an exec... function call is made, any open files remain open in the
child process.

Return Value:
On success, the functions do not return.
On error, the functions return -1 and set
errno to one of the following:
E2BIG Arg list too long
EACCES Permission denied
EMFILE Too many open files
ENOENT Path or file name not found
ENOEXEC Exec format error
ENOMEM Not enough core

***************
execv example
***************
#include <process.h>
#include <stdio.h>
#include <errno.h>

int main(int argc, char *argv[])
{
int i;

printf("Command line arguments:\n");
for (i=0; i < argc; i++)
printf("[%2d] : %s\n", i, argv[i]);

printf("About to exec child with arg1 arg2 ...\n");
execv("CHILD.EX E", argv);

perror("exec error");
exit(1);
return 0;
}

Okay, all I need is to make a seperate program run from my c++ console based program, where the file path is in a string variable.

[compman9902]

Okay, all I need is to make a seperate program run from my c++ console based program, where the file path is in a string variable.

The issue has been resolved, thank you for all of your help
all I did was add quotes to the beggining and end of the path, then make the path into an "old style string", then put it into the system command. Easy, simple, and working.