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C Discussion Thread
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Jan 5th, 2009

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can't copy existing file into new file

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this coding is about copy one existing file into other file

but it can't do so throught the command line arg. what is

the solution....?

c Syntax (Toggle Plain Text)
               #include<stdio.h>
 
	#include<conio.h>
 
	#include<stdlib.h>
 
	void main(char *argv[])
	{
 
		FILE *fp1,*fp2;
		char c;
		int i;
 
		clrscr();
 
		fp1=fopen(argv[1],"r");
 
		rewind(fp1);
 
		fp2=fopen(argv[2],"w");
 
		if(fp1==NULL)
		{
 
			printf("Source File is Not Exist");
			exit(0);
 
		}
 
		while((c=getc(fp1))!=EOF)
		{
 
			putc(c,fp2);
 
			printf("%c",c);
 
		}
 
		fclose(fp1);
 
		fclose(fp2);
 
	getch();
 
	}
               #include<stdio.h>

	#include<conio.h>

	#include<stdlib.h>

	void main(char *argv[])
	{

		FILE *fp1,*fp2;
		char c;
		int i;

		clrscr();

		fp1=fopen(argv[1],"r");

		rewind(fp1);

		fp2=fopen(argv[2],"w");

		if(fp1==NULL)
		{

			printf("Source File is Not Exist");
			exit(0);

		}

		while((c=getc(fp1))!=EOF)
		{

			putc(c,fp2);

			printf("%c",c);

		}

		fclose(fp1);

		fclose(fp2);

	getch();

	}

Last edited by Ancient Dragon; Jan 5th, 2009 at 9:39 pm. Reason: add code tags

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nitu_thakkar

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Jan 5th, 2009

Re: can't copy existing file into new file

1. Wrong main prototype. Must be:

c Syntax (Toggle Plain Text)
int main(int argc, char*argv[])
int main(int argc, char*argv[])

2. fgetc returns int, declare c as int.
3. No need in rewind(fp1). Test fp1 == 0 befory any ops with opened file.
4. Test argc == 3 (argv[0] - program name, argv[1] and argv[2] - file names).
5. You can't copy binary file in text mode. To open in binary mode use "rb" and "wb" open mode arguments.

Last edited by ArkM; Jan 5th, 2009 at 7:01 pm.

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Jan 6th, 2009

Re: can't copy existing file into new file

Click to Expand / Collapse Quote originally posted by ArkM ...

1. Wrong main prototype. Must be:
c Syntax (Toggle Plain Text)
int main(int argc, char*argv[])
int main(int argc, char*argv[])
2. fgetc returns int, declare c as int.
3. No need in rewind(fp1). Test fp1 == 0 befory any ops with opened file.
4. Test argc == 3 (argv[0] - program name, argv[1] and argv[2] - file names).
5. You can't copy binary file in text mode. To open in binary mode use "rb" and "wb" open mode arguments.

i have tried it but there is no change i got the same massage

here, getc() function used for get the value from existing file ,

character by character & put into new file

( which is given during run time )

character by character

can u pls send me more detail....?

Last edited by nitu_thakkar; Jan 6th, 2009 at 1:28 pm.

nitu_thakkar

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Jan 6th, 2009

Re: can't copy existing file into new file

>>i have tried it but there is no change i got the same massage
What error message -- you never said what that was. Post code and make sure main() is declared like ArkM posted.

Post code if you need more help. And if you are trying to copy binary files then you have to open the files in binary mode, also as previously suggested.

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