Adding string to array of char *

Question

I would like to know how to add a string to array of char*

#define FROM    "<[email protected]>"
#define TO      "<[email protected]>"
#define CC      "<[email protected]>"
#define SUBJECT "TESTING SUBJECT"

string testing("USING variables");
const char * c = "Subject: ";

static const char *payload_text[]={
"To: " TO "\n","From: " FROM "\n","Cc: " CC "\n",c "\n",
"\n", /* empty line to divide headers from body, see RFC5322 */
SUBJECT "\n",
"\n",
"Testing the msg.\n",
"Check RFC5322.\n",
NULL
   };

I would like to add either c or the variable testing to the array of payload_test[] or is there other way to create the array paylod_text[] with user insiated variables.

you are #defining so many things why not #define subject and body too ? — Neel Basu
– Neel Basu, Commented Aug 19, 2012 at 12:05

perilbrain · Accepted Answer · 2012-08-19 12:18:09Z

1

If you want to add testing then just put it in the parameters as

testing.c_str()

Also one more way is there

string body="Testing the msg.\n";
body+=testing;
body+="Bye ....";

And to put in array use

body.c_str();

edited Aug 19, 2012 at 12:18

answered Aug 19, 2012 at 12:08

perilbrain

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Comments

user529758 · Accepted Answer · 2012-08-19 12:08:12Z

1

Why not use a dynamically allocated array?

char **email = malloc(sizeof(*email) * 6);
email[0] = "To: " TO "\n";
...
char buf[256];
snprintf(buf, sizeof(buf), "%s \n", c);
email[3] = strdup(buf);
..

Don't forget to free any string created by strdup() after use.

answered Aug 19, 2012 at 12:08

user529758

1 Comment

M.A Over a year ago

Is this the same as static const char *payload_text[]={"To: " TO "\n","From: " FROM "\n","Cc: " CC "\n",SUBJECT "\n","\n",c "\n","\n","Testing the msg.\n","Check RFC5322.\n",NULL }; char **email = malloc(sizeof(*email) * 6); char buf[256]; snprintf(buf, sizeof(buf), "To: %s \n", toAddress); email[0] = strdup(buf); snprintf(buf, sizeof(buf), "Subject: %s \n", emailSubject); email[1] = strdup(buf); snprintf(buf, sizeof(buf), "Message: %s \n", emailMessages); email[2] = strdup(buf); email[6]=NUL

Neel Basu · Accepted Answer · 2012-08-19 12:08:53Z

0

I'd prefer using string for payload_text instead. then you can easily append characters and other strings t it. and latter payload_text.c_str() it if underlying library needs char*

there is boost::format(). You can use it to replace %1%, %2% with your subject and body. like boost::format("SOME STRING %1% AND THEN %2%") % subject % body

answered Aug 19, 2012 at 12:08

Neel Basu

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Comments

jsha · Accepted Answer · 2012-08-19 12:27:27Z

0

To do this natively in C (versus using the C++ STL classes), you can use strcat:

char* buffer = malloc((strlen(c) + strlen(payload_text) + 1) * sizeof(char));
strcpy(buffer, payload_text);
strcat(buffer, c);

This are only valid if you're sure the input is null-terminated and contains no internal nulls. Otherwise use strncpy and strncat.

To do this in C++ using the STL classes:

string result = string(payload_text);
result += testing;

edited Aug 19, 2012 at 12:27

answered Aug 19, 2012 at 12:12

jsha

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