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Ithink it's a noob question but i can't do this

gimme an example

I have a string.It's empty and I want to change this value.

If you have a null char*, you have to malloc it first.

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char * test; // it is null
test = malloc(255); // no longer null
strcpy(test, "text to go into the string here");

You can also use sprintf or any other str function. If it is a char[] then it should work without the malloc. But do make sure to free the char* after you don't need it anymore.

Thank you

But i have an another problem... I want to read it and write in actor...But my code doesn't works...

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csak1ideig.text = file1;


I assume that you want to read in a file, if so you will have to use fopen, and fgets. Here are some posts about how to use it.
http://game-editor.com/forum/viewtopic.php?f=1&t=8984&hilit=+fopen
http://game-editor.com/forum/viewtopic.php?f=2&t=6968&hilit=+fopen#p49662

No-No...The file1 is name of string

Oh, that's simple. All you would just use strcpy, or sprintf, and the "text to go into the string here" is replaced with the string (they are both strings).

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strcpy(text, file1);