[英]Error with pointers. Invalid type argument of unary *
#include "cdebug.h"
#include "stdlib.h"
int main()
{
char *cbloc = (char *)malloc(sizeof(char) * 40);
memset(cbloc, 40, sizeof(char) * 40);
DFORC(cbloc, 0, sizeof(char) * 40);
system("PAUSE");
}
Below is the header I wrote for debugging with pointers 以下是我编写的用于调试指针的标头
#ifndef _CDEBUG_H_
#define _CDEBUG_H_
#include "stdio.h"
int counter;
//Debugging functions written by skrillac
//constants
#define NEWLN() printf("\n");
#define DFORC(ptr, offset, len) for (counter = offset; counter < len+offset; counter++)printf("'%c', ", *ptr[counter]);
#define DFORI(ptr, offset, len) for (counter = offset; counter < len+offset; counter++)printf("'%i', ", *ptr[counter]);
#define DFORV(ptr, offset, len) for (counter = offset; counter < len+offset; counter++)printf("%x, ", *ptr[counter]);
#endif
The error is happening somewhere in the DFORC() macro. 该错误发生在DFORC()宏中的某处。 I guess my question is where is that exactly and how would I fix it?
我想我的问题是确切的位置以及如何解决?
cbloc
is a pointer to characters, so in DFORC
, ptr
is also a pointer to characters. cbloc
是指向字符的指针,因此在DFORC
, ptr
也是指向字符的指针。 The statement: 该声明:
printf("'%c', ", *ptr[counter]);
First uses ptr
as an array, accessing element counter
of that array. 首先使用
ptr
作为数组,访问该数组的元素counter
。 This returns a char
( not a char *
). 这将返回一个
char
( 不是 char *
)。 You then try to dereference that char
, which is doesn't make sense, hence the error. 然后,您尝试取消对该
char
引用,这是没有意义的,因此会出现错误。
To fix this, change that statement to either of the following statements: 要解决此问题,请将该语句更改为以下任一语句:
printf("'%c', ", ptr[counter]);
printf("'%c', ", *(ptr + counter));
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