Returning a string

**LAN** · 02-06-2002

I am trying to pass a string from one function to another and am going around in circles. PLEASE HELP!!!

The following function is where I call the function

void readRTC()
{
char RTC[6];
RTC = Read_RTC(&RTC);
cout<<RTC;
}

Calling the function below.

??????? Read_RTC(char* Buffer)

{

unsigned int i;
unsigned char sec,ten_sec,time1,time1_ten,time2,time2_ten;
char Buffer[6];

cout<<"RTC Time";

if(RTC_ready()) //check status of rtc
{

RaiseSS_RTC();
SendByte(0x00); //send start address, this will auto inc
//read addresses 0x00 - 0x10 this includes all time/date and alarm0&1 and regs
for(i=0;i<17;i++)
{

RTC_RX_data[i]=SendByte(0x00); //send dummy byte to read from address
}

LowerSS_RTC();
time2_ten =(RTC_RX_data[2]>>4)&0x0f;
cout<<(unsigned int)(unsigned char) time2_ten;
time2 =(RTC_RX_data[2])&0x0f;
cout<<(unsigned int)(unsigned char) time2;
time1_ten =(RTC_RX_data[1]>>4)&0x0f;
cout<<(unsigned int)(unsigned char) time1_ten;
time1 =(RTC_RX_data[1])&0x0f;
cout<<(unsigned int)(unsigned char) time1;
ten_sec=(RTC_RX_data[0]>>4)&0x0f;
cout<<(unsigned int)(unsigned char) ten_sec;
sec=(RTC_RX_data[0])&0x0f;
cout<<(unsigned int)(unsigned char) sec;

sprintf(Buffer, "%d%d"":""%d%d"":""%d%d",time2_ten,time2,time1_ten ,time1,ten_sec,sec);
cout<<Buffer;

return Buffer;

}
else
{

cout<<"RTC initialise failure"<<endl;
return 0;
}

}

**Shade** · 02-06-2002

this has nothing to do with C!
use std::string instead of char*

or if you want to code C then you have the pass the return value as pointer TO the function:

void doSomeThing(char* s);

doSomeThing now may fill s with values! so the caller has to provide the memory...

**adrianxw** · 02-06-2002

Consider the following simple program...

Code:

#include <stdio.h> 

void abcd (char *);

int main() 
{
	char a[6];
	abcd(a);
	printf("%s\n",a);
	return 0;
}

void abcd(char *x)
{
	sprintf(x,"Hello");
}

... also consider posting this on the C++ board!

**adrianxw** · 02-06-2002

I meant post C++ questions there, not crosspost it there!!! You posted a C++ question on the C board!

There, I've moved this one and deleted your crosspost.

Unregistered · 02-06-2002

Here's a C++ version of passing the same string to several functions.

#include <iostream.h>
#include <string.h>

void abcd (char *);
void bar(char *);

int main()
{
char a[20];
abcd(a);
cout << "string a ends up as : " << a;
return 0;
}

void abcd(char *x)
{
strcpy(x, "hello ");
cout << "string x starts as : " << x << endl;
bar(x);
cout << "string x now is " << x << endl;
}

void bar(char * y)
{
char foo[7] = "world";
cout << foo << endl;
strcpy(y, foo);
cout << "string y is now " << y << endl;
}

x, y, and a should end up the same because they ARE all the same string being handed from function to function by reference using pointer syntax.

**golfinguy4** · 02-06-2002

I once read of something called typename of something like that. I am not sure what it does but might be what is needed. Someone who knows please respond.

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