Fread fprintf text file issue

Question

Hello guys,
I have a problem I wish you can help me fix.
I have written a .txt file using fprintf. So everything is formatted as I wanted in the file. The advantage of using fprintf in my code is that I used format specifiers to print (write) values of variables at run tim in the file... Brief the problem is that
now I need to put ALL the content of the text file into a  buffer pointed to by a (char * ) so that I can use that buffer in a pdfLibrary function (libHaru)... BUT since I used fprintf, fread doesnt function properly an I get "garbage"
in the (char * )  pointer and the buffer it points to. I failed when trying to use fscanf. I'll put my code here but.
Below a piece of my code. Hopefully you'll see through it.
Could you guys help me to find a way around this problem ?
Another problem is I MUST use fprintf instead of fwrite since I write values (using format specifiers) of variables a run time AND I need the output to be formatted so libHaru will just blindly prind the text to a pdf page.
void main(void)
FILE *fp;
char *myfile_text;
fp = fopen("myfile.txt", "r");
//myfile.txt was written with fprintf
fseek(fp, 0, SEEK_END);
myfile_size = ftell(fp);
myfile_text = (char*)malloc(sizeof(char)*myfile_size);
fread(myfile_text, sizeof(char), myfile_size, fp);
//fscanf(fp, "%s", text); FAILED
puts(myfile_text); // DOES NOT PRINT THE TEXT
//libHaru code
HPDF_Page_BeginText(page);
hauteur_page = HPDF_Page_GetHeight(page);
/*myfile_text pointer utilisation*/HPDF_Page_TextOut(page, x, y, myfile_text);
HPDF_Page_EndText(page);
HPDF_SaveToFile(pdfDoc, "test.pdf");
fclose(fp);
free(myfile_text);

Answer 1

This is obviously not the code you executed.  For example, there is no definition of myfile_size.  If your code is not doing what you expect, you need to show us the code that executed.  It's OK, even desirable, to strip your function
down to the minimum that demonstrates the problem but then you need to compile and execute that stripped down version.  Otherwise, we are comparing apples and oranges.  However, it is all we have to talk about now, so-
How did you determine that the file was written correctly?
Consider that fread() probably returned 0.  Since you positioned the file pointer at the end of the file, there was nothing left to read.  What would you expect puts() to produce in this case?
fp is opened as a text file.  The description of ftell() warns that the return value is not necessarily a character count.
One common method of reading a text file of unknown size into a buffer is:
     Determine a "reasonable" initial size for the buffer and a "reasonable" increment if the file is larger.
     Allocate the initial size.
     Attempt to read that many characters.
     If you read less:
          You are done.
          If you want, you can free the excess by reallocating the buffer to just this size.
     Loop until you read less than requested (or the expansion fails):
          Use realloc() to expand the buffer by the increment
          Attempt to read that many more characters at the end of the current data.
          Repeat.
If you are going to pass the buffer to puts(), you need to add the '\0' termination character at the end of the data to make it a well formed string.  fread() does not do this for you like some other functions.
Since you are coding in C:
     main() returns int.  Always.
     You don't need to cast the return value of malloc().
     sizeof(char) is guaranteed to be 1.