c and html

**spongebob** · 07-05-2006

hi
i am writting a program that takes in the input of your html, and proceses it into a .html file called "program". But instead of a code being generated from the user, it just makes one character appear. can someone please help me? heres the code:

Code:

#include <stdio.h>
int a;

FILE * tvFile;
main()

{
tvFile = fopen("c:\\program.html", "w");

printf("Type in you html, this will then be put into the directory c:\\program.html");
scanf("%c",&a);
char html=a;


fprintf(tvFile,"%c",html);

fclose(tvFile);
return 0;


}

thanks in advance!

**tao** · 07-05-2006

You're reading in a single char using

Code:

scanf("%c", &a);

Check out reading in lines of text with fgets().

**Thantos** · 07-05-2006

Heres a hint: To do something more then once use a loop.

**spongebob** · 07-05-2006

ok i have incoorperated fgets(). AND IT WOKRED!!! but now i want to add soemthing where the user choses the name of the .html file. i have tried this, but it doesnt work, can someine help me imorove this code??

Code:

#include <stdio.h> 
#include <string.h> 
FILE * tvFile;
int main()
{
    char fileName;
    char buf[BUFSIZ];
  char *p;
    
    printf("what do you want the .html file to be saved as?");
     if (fgets(fileName, sizeof(fileName), stdin) != NULL)
{tvFile = fopen("c:\\>%s<.html",fileName, "w");



  char buf[BUFSIZ];
  char *p;
  
 
  printf ("please enter your html, it will be saved to c://program, max%d characters\n", sizeof(buf));
  
  if (fgets(buf, sizeof(buf), stdin) != NULL)
  {
    printf ("Thank you, you entered >%s<\n", buf);
    
    fprintf(tvFile,"%s", buf);

fclose(tvFile);
  
  }
  
  return 0;
}

Thanks again!

**itsme86** · 07-05-2006

Code:

fopen("c:\\>%s<.html",fileName, "w");

When you see the compiler warnings about too many arguments to fopen(), it should be a big hint. fopen() isn't like the printf() functions. Try using sprintf() to copy the complete filename to a buffer and then passing that buffer to fopen(). Also, filenames can't contain the '>', '<', or '\n' characters.

**spongebob** · 07-05-2006

When you see the compiler warnings about too many arguments to fopen(), it should be a big hint. fopen() isn't like the printf() functions. Try using sprintf() to copy the complete filename to a buffer and then passing that buffer to fopen(). Also, filenames can't contain the '>', '<', or '\n' characters

sorry i didnt explain...... i am really new to c, so please can you "dumb" that down a bit please. Thanks

**itsme86** · 07-05-2006

Google be your friend: http://www.die.net/doc/linux/man/man3/sprintf.3.html

**spongebob** · 07-05-2006

owwww im really not understanding this. can somone explain it to me in lamens terms. please? im not in a understanding of sprintf at all! why wont the filename thing work? can someone please explain all of this if possible?

**fgw_three** · 07-05-2006

Originally Posted by spongebob

sorry i didnt explain...... i am really new to c, so please can you "dumb" that down a bit please. Thanks

You cannot use print format specifiers (i.e. "%s") in the file name argument to fopen.

What itsme86 was saying was to create the filename string, using sprintf, and then pass that string as an argument to fopen.

hope this helps,
frank

**itsme86** · 07-05-2006

sprintf() is just like printf(), only instead of spitting the output to stdout, it spits it into a buffer. Try this program:

Code:

#include <stdio.h>

int main(void)
{
  char buf[20];

  sprintf(buf, "C:\\%s%d", "itsme", 86);
  puts(buf);

  return 0;
}

**spongebob** · 07-05-2006

ok i think im starting to get there. can somone give me some example code? nothing to big, just something that demonstrates. It would be highly appriciated! Thanks in advance! oh sorry i didnt see the above!

**fgw_three** · 07-05-2006

BTW, there are other errors with your program.....

Code:

   char fileName;
    char buf[BUFSIZ];
  char *p;
    
    printf("what do you want the .html file to be saved as?");
     if (fgets(fileName, sizeof(fileName), stdin) != NULL)
{tvFile = fopen("c:\\>%s<.html",fileName, "w");

is not going to work. Your are only allocating one character's worth of space for the filename.

Without getting into all the details about dynamically allocating space for user input, you need to at least do something like

char fileName[256]

or something like that. (But beware, if the user enters more than that you will buffer overflow).

**tao** · 07-05-2006

Some issues to take note:

1- You're declaring char buf[BUFSIZ] and char *p twice, which isn't necessary (or proper in this case).
2- You are declaring variable fileName as a single character (read up on arrays if you don't understand them yet). Try declaring fileName as

Code:

char fileName[50]

or an appropriate max size for the filename to be (there's a MAX_PATH or something for an OS's maximum allowable path size, but I forget what the actual parameter is and it might be C++ only).

> Once you've fixed that up, you can just call

Code:

tvFile = fopen(fileName, "w");

That only works if the user enters a legitimate filepath/name for the file, though. If they just enter a name (i.e. "myfile.txt"), it will create the file in the current working directory.

**spongebob** · 07-05-2006

i am still extremely stuck. I have now chaneged the number of characters for the filename. But it still isnt allowing me to create the filename. This is partly becuase i am not understanding what you are saying - my fault entirely.

**itsme86** · 07-05-2006

Let's see your new code.

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