将文件从SD卡位置复制到Android中C语言的另一个位置

Question

I have written a code to copy a text file from one location( /mnt/sdcard/Appfolder/filename.txt ) to another( /data/test/log.txt ) in Android device in C language and building it using ndk .

I donot know the name of the file so i have put *.txt as source file.

int copy_file(char* src, char *dest) {

  FILE *p,*q;
  char *file1,*file2;
  int ch;

  file1 = src;
  p=fopen(file1,"r");
  if(p==NULL){
      printf("cannot open %s",file1);
      exit(0);
  }

   file2 = dest;
  q=fopen(file2,"w");
  if(q==NULL){
      printf("cannot open %s",file2);
      exit(0);
  }
  while((ch=getc(p))!=EOF)
      putc(ch,q);
  printf("\nCOMPLETED");
  fclose(p);
  fclose(q);
 return 0;
}

But I am getting this error:

cannot open /mnt/sdcard/Appfolder/<filename.txt>

What am I doing wrong?

The file attributes of the is 660.

Answer 1

You could use the system() function to do this. For example, for Windows, you could just use the copy command to copy txt files.

system("copy C:\src\dir\*.txt C:\dest\dir\");

Or with variables (pseudo code):

#define PATH_MAX        4096


char command[MAX_PATH * 2 + 6];
char *file1 = src, *file2 = dest;


strcpy(command, "copy ");
strcat(command, file1);
strcat(command, " ");
strcat(command, file2);

system(command);