Ponter to Constant

[leto]

Hi,

I want to create a function like this.

void PrintStr( char *StringData )
{
}

When I perform this function: PrintStr("Hello World"), the compiler say:

Attempt to create a pointer to a Constant.

How can i solve this problem?

Thank you.
Leto.

[treitmey]

CCS does not allow pointer to const. I use a 2D array

[leto]

Thank you. i'll try as you say. But, I ask me how will the compiler do to compile printf("Hello world").

thanks anyway.

[rwyoung]

[Ttelmah]

On the PrintStr function, declare a function like this instead:

[Mark]

If you need to process the entire const string inside a function, then copy it to RAM first and then pass a pointer to the RAM buffer, otherwise ttelmah's suggestion works just fine and is something special that CCS does.

[leto]

thank you again.

Im trying to improve the GlcdText57 function from graphics.c driver.
It receive a char pointer with the string to print, then it print each byte.
But, you must to declare the buffer previously.

e.g

char buffer[]="Hello Word";
GldText57( row, col, buffer, size, ..)

each time you want to print something you must to copy the String to buffer.

Sprintf(buffer,"string to print");
GldText57( row, col, buffer, size, ..);

I think Ttelmah's suggestion would must be better to dont spend enough memory. may be a little slower. What do you think?

Regards,
Leto.

[Mark]

If you are only going to print const strings then ttelmah suggestion works if you dont need to process the entire string at once.

However, if you are going to print strings that are "made on the fly" then you might be better off copying them to ram.