如何使用字符串打开二进制文件?使用C
我的印象是,要使用字符串打开二进制文件,您可以简单地创建字符串,然后将其实现为将读取字符串的文件的名称。这就是我的讲义所说的。然而我显然错过了一些东西。我在 fopen 中使用了 &name, name, &name[SIZE] ,每次我都得到 inBinFile == NULL ,除非我使用注释行。我的字符串是正确的。怎么了?非常感谢您的帮助。提前致谢。
#include <stdio.h>
#include <stdlib.h>
#define SIZE 25
int frstmenu(void);
int sndmenu(void);
int main()
{
int fmenu, smenu;
char name[SIZE];
FILE *inBinFile;
unsigned char numRead;
fmenu = frstmenu();
if ( fmenu !=1 && fmenu !=2 )
{
printf("\nIncorrect option\n");
fmenu = frstmenu();
}
if (fmenu == 1)
{
printf("\nEnter the file name: \n");
scanf("%s", &name[SIZE]);
/* printf("filename: %s", &name[SIZE]); */
smenu = sndmenu();
if (smenu !=1 && smenu !=2 )
{
printf("\nIncorrect option\n");
smenu = sndmenu();
}
if (smenu == 1)
{
inBinFile = fopen( name, "rb");
/* inBinFile = fopen( "stream.grc", "rb"); */
if (inBinFile == NULL)
{
fprintf(stderr, "Error opening %s", &name[SIZE]);
return(-1);
fclose(inBinFile);
}
}
return(0);
}
int frstmenu()
{
float selection;
printf("----Menu----\n");
printf("1 Open a file ( supported format: .grc )\n");
printf("2 Exit the program\n");
printf(" Please select an option (1 or 2): ");
scanf("%f", &selection);
return(selection);
}
int sndmenu()
{
int selection;
printf("---Menu---\n");
printf("1 Decode the sequence\n");
printf("2 Exit the program\n");
printf(" Please select an option (1 or 2):\n");
scanf("%i", &selection);
return(selection);
}
I was under the impression that to open binary files using strings, you could simply create the string, and then implement it as the name of the file where it will read the string. This is what my lecture notes state. However I'm obveously missing something. I've used &name, name, &name[SIZE] within the fopen and each time i've gotten inBinFile == NULL unless I use the commented line. My string is correct. What's wrong? Help is much appreciated. Thanks in advance.
#include <stdio.h>
#include <stdlib.h>
#define SIZE 25
int frstmenu(void);
int sndmenu(void);
int main()
{
int fmenu, smenu;
char name[SIZE];
FILE *inBinFile;
unsigned char numRead;
fmenu = frstmenu();
if ( fmenu !=1 && fmenu !=2 )
{
printf("\nIncorrect option\n");
fmenu = frstmenu();
}
if (fmenu == 1)
{
printf("\nEnter the file name: \n");
scanf("%s", &name[SIZE]);
/* printf("filename: %s", &name[SIZE]); */
smenu = sndmenu();
if (smenu !=1 && smenu !=2 )
{
printf("\nIncorrect option\n");
smenu = sndmenu();
}
if (smenu == 1)
{
inBinFile = fopen( name, "rb");
/* inBinFile = fopen( "stream.grc", "rb"); */
if (inBinFile == NULL)
{
fprintf(stderr, "Error opening %s", &name[SIZE]);
return(-1);
fclose(inBinFile);
}
}
return(0);
}
int frstmenu()
{
float selection;
printf("----Menu----\n");
printf("1 Open a file ( supported format: .grc )\n");
printf("2 Exit the program\n");
printf(" Please select an option (1 or 2): ");
scanf("%f", &selection);
return(selection);
}
int sndmenu()
{
int selection;
printf("---Menu---\n");
printf("1 Decode the sequence\n");
printf("2 Exit the program\n");
printf(" Please select an option (1 or 2):\n");
scanf("%i", &selection);
return(selection);
}
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您可能想说
甚至只是:
您的
指向&name[SIZE]
name + SIZE
,超出< /em> 分配的内存。You probably want to say
or even just:
Your
points to&name[SIZE]
name + SIZE
, which is beyond the allocated memory.