Thread: I m geting the error Unhandled exception at 0x75c885ea in h1.exe: 0xC0000005: Access

Code:

#include< stdio.h >
#include<windows.h>
void main()
{
  char c[4];
  int cnt, i, len;
  FILE *fd;
  fd = CreateFile("d:\\data13.txt", GENERIC_READ | GENERIC_WRITE,
                  FILE_SHARE_READ, NULL, CREATE_ALWAYS,
                  FILE_ATTRIBUTE_NORMAL, NULL);
  if (fd == NULL) {
    printf("file doesnt exist");
  } else {
//do
//{ 
    for (i = 0; i <= 4; i++) {
      c[i] = getchar();
    }
    c[i] = '\0';
//}while(!EOF);
    WriteFile(fd, c, strlen(c), NULL, NULL);
//fwrite(c,strlen(c),1,fd);
    fputc('\0', fd);
    fclose(fd);
  }
  c[0] = '\0';
  fd = fopen("d:\\data1.txt", "r");
  if (fd == NULL)
    printf("do exist");
  else {
    fread(c, sizeof(char), 1, fd);
    printf("%5s", c);
  }
  fclose(fd);
　}

FFS: Compile with warnings enabled!

..\test.c:3: warning: return type of 'main' is not 'int'
..\test.c: In function 'main':
..\test.c:6: warning: unused variable 'len'
..\test.c:6: warning: unused variable 'cnt'
..\test.c:21: warning: array subscript is above array bounds
..\test.c:19: warning: array subscript is above array bounds

If you can't see that you're accessing c[i] when i is both 4 and 5 and c only has elements 0-3, it's because you're NOT compiling with warnings on.

Indent your code if you actually want anyone to read it.

CreateFile doesn't return NULL on failure, and that's not how you call WriteFile in that case. Reread what MSDN says because it's quite explicit about those things.