RE: [Dev-C++] execution of a string with system()

[Santiago P. C. <San...@yd...>]

Hi *,

Simon, you can both use a char array (buffer) from the beginning or use
string and then copy the contents to a char array (buffer), anyway this i=
s a
mixed C/C++ situation:

1st)=20
#include <iostream>=20
#include <stdlib.h>

#define BUFFER_SIZE	32

int main()
{=20
char 	 szIP[BUFFER_SIZE];
char 	 szCommand[BUFFER_SIZE];

cout << "Enter the ip to trace:";
cin >> szIP; //enter domain-name of pc

sprintf(szCommand,"tracert %s",szIP);

system(szCommand);
system("PAUSE");
return 0;=20
}=20


Or the 2nd option)

#include <iostream>=20
#include <string>
#include <stdlib.h>

#define BUFFER_SIZE	32

char*	ConvertStringToSzData(string strValue)=20
{
=09int  iStrLen =3D strValue.size();
=09char* pSzData =3D (char*) malloc( (iStrLen+1)*sizeof(char) );

=09if (pSzData)
=09{
=09	strncpy(pSzData,strValue.data(),iStrLen);
=09	// NULL TERMINATED STRING ;o)
=09	pSzData[iStrLen] =3D '\0';
=09}

=09return pSzData;
}

int main()
{=20
string strIP;
char 	 szCommand[BUFFER_SIZE];

char* pSzIP =3D NULL;

cout << "Enter the ip to trace:";
cin >> strIP; //enter domain-name of pc

pSzIP =3D ConvertStringToSzData(strIP);

if (pSzIP)
{
=09sprintf(szCommand,"tracert %s",pSzIP);

=09free(pSzIP);

=09system(szCommand);
}
else
=09cout << "ERROR: Cannot convert string to char array!" << endl;

system("PAUSE");
return 0;=20
}=20

Hope this helps!
Santy

-----Original Message-----
From: Simon Johner [mailto:el...@op...]=20
Sent: mi=E9rcoles, 18 de septiembre de 2002 16:29
To: dev...@li...
Subject: [Dev-C++] execution of a string with system()


Hello everybody,

I tried to write a programm which does execute some dos command (like
tracert, ping etc.) with an ip.

At first, I created a string (#include <string>), but when I tried to
execute it with the system()-command, I got the following error
(exec=3Dstring-Variable): "cannot convert 'exec' from type string to type=

'const char*'"

Finally -after some hours of trying :)- I've got the following solution:

#include <iostream>=20
#include <stdlib.h>


int main()
{=20
int i;
char pcno[20];

cout << "Enter the ip to trace:" , cin >> pcno; //enter domain-name of pc=

(domain-name is supposed to be 8 chars long)

for (i=3D0;i<8;i++){pcno[i+8]=3Dpcno[i];}; //put the domain name at the e=
nd
pcno[0]=3D't'; pcno[1]=3D'r'; pcno[2]=3D'a';
pcno[3]=3D'c';                           //enter the dos-command in the f=
irst
chars
pcno[4]=3D'e';
pcno[5]=3D'r';
pcno[6]=3D't';
pcno[7]=3D' ';
for (i=3D16;i<40;i++){pcno[i]=3D' ';};

system(pcno);
system("PAUSE");
return 0;=20
}=20


Does someone know an easier solution?

Tanks for your help.

Simon
--=20
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