指向字符串然后返回64位计算机上的指针。 [英] pointer to string and then back to pointer on a 64 bit machine.

问题描述

如何将指针地址打印到字符串缓冲区然后在64位计算机上读取它？

强制是使用字符串（char * buffer）只有。


使用％d打印时不会捕获指针的完整64位。

确实在printf和scanf中都存在％l目的？

How do I print a pointer address into a string buffer and then read it
back on a 64 bit machine ?
Compulsion is to use string (char * buffer) only.

printing with %d does not capture the full 64-bits of the pointer.
does %l exist in both printf and scanf for this purpose ?

推荐答案

atol不起作用！

它没有带回正确的值字符串缓冲区。
带有％lu的
sscanf非常好。

#include< stdio.h>


int main （）{

char * p =（char *）182947876880;

char * p2;

char buf [100];


printf（" \ n \ nn"）;

printf（" lu =％lu \ n"，p）;


sprintf（buf，"％lu"，p）;

printf（" buf =％s \ n"，buf）;


p2 =（char *）atol（buf）; //这条线不工作

sscanf（buf，％lu，& p2）; // sscanf预期的工作

printf（" lu =％lu \ nn"，p2）;


if（p == p2） {

printf（" equal \ n"）;

}其他{

printf（" NOT equal\\\
） ;

}


printf（" \ n \ n"）;

}

atol does not work !
It does not bring back the correct value from the string buffer.
sscanf with %lu does it very well.
#include <stdio.h>

int main () {
char *p = (char *)182947876880;
char *p2;
char buf[100];

printf ("\n\n");
printf ("lu = %lu\n", p);

sprintf (buf, "%lu", p);
printf ("buf = %s\n", buf);

p2 = (char *)atol (buf); // THIS LINE DOES NOT WORK
sscanf (buf, "%lu", &p2); // sscanf DOES THE EXPECTED JOB
printf ("lu = %lu\n", p2);

if (p==p2) {
printf ("equal\n");
} else {
printf ("NOT equal\n");
}

printf ("\n\n");
}

let_the_best_man_win写道：

let_the_best_man_win wrote:

如何将指针地址打印到字符串缓冲区然后读取

返回64位机器？

强制是仅使用字符串（字符*缓冲区）。


使用％d打印不会捕获指针的完整64位。

为了这个目的，printf和scanf中是否存在％l？

How do I print a pointer address into a string buffer and then read it
back on a 64 bit machine ?
Compulsion is to use string (char * buffer) only.

printing with %d does not capture the full 64-bits of the pointer.
does %l exist in both printf and scanf for this purpose ?

那个''因为％d不是指针，％p是。


-

Ian Collins。

That''s because %d isn''t for pointers, %p is.

--
Ian Collins.

sscanf中是否有相应的％p？

Is there a corresponding %p in sscanf ?

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