程序和Watson博士因不明原因崩溃了...... [英] Program and Dr. Watson crashes for unknown reasons...
问题描述
以下程序运行正常，直到返回语句，其中
崩溃，因此，Watson博士（drwtsn32.exe）也崩溃。
删除通话到fgets（），一切运行正常。我认为*
堆栈或其他东西在fgets（）期间搞砸了。有人可以帮忙吗？
谢谢。
#include< stdio.h>
#include< stdlib.h>
int main（int argc，char * argv []）{
char ** fbuffer =（char **）malloc（8192 * sizeof（char））;
FILE * fp = fopen（" data.dat"，" r"）;
fgets（fbuffer [count]，64 ，FP）; //麻烦。
printf（"％s"，fbuffer [count]）;
system（暂停）;
返回0;
}
//(data.dat包含2行短文本）
The following program runs alright until the return statement, where it
crashes, and consequently, Dr. Watson (drwtsn32.exe) also crashes.
Deleting the call to fgets() and everything runs fine. I *think* the
stack or something got mess up during the fgets(). Could anyone help?
Thanks.
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]){
char **fbuffer=(char **)malloc(8192*sizeof(char));
FILE *fp=fopen("data.dat","r");
fgets(fbuffer[count],64,fp); //Trouble here.
printf("%s",fbuffer[count]);
system("pause");
return 0;
}
//(data.dat contains 2 short lines of text)
推荐答案
Steven写道：
以下程序运行正常，直到返回语句，它崩溃，因此，Watson博士（drwtsn32.exe）也崩溃。
删除对fgets（）的调用，一切运行正常。我认为*
堆栈或其他东西在fgets（）期间变得混乱。有人可以帮忙吗？
谢谢。
#include< stdio.h>
#include< stdlib.h>
int main（int argc，char * argv []）{
char ** fbuffer =（char **）malloc（8192 * sizeof（char））;
FILE * fp = fopen（" data .dat"，" r"）;
fgets（fbuffer [count]，64，fp）; //麻烦在这里
问题1：什么是'count''？
问题2：假设`count''在某处定义，
`fbuffer [count]' ' 指向？ [提示，没有分配内存。]
printf（"％s"，fbuffer [count]）;
系统（暂停）;
返回0;
}
//(data.dat包含2条短文本行）
The following program runs alright until the return statement, where it
crashes, and consequently, Dr. Watson (drwtsn32.exe) also crashes.
Deleting the call to fgets() and everything runs fine. I *think* the
stack or something got mess up during the fgets(). Could anyone help?
Thanks.
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char *argv[]){
char **fbuffer=(char **)malloc(8192*sizeof(char));
FILE *fp=fopen("data.dat","r");
fgets(fbuffer[count],64,fp); //Trouble here. Question 1: What is `count''?
Question 2: Assuming `count'' is defined somewhere, what does
`fbuffer[count]'' point to? [Hint, no memory has been allocated to it.]
printf("%s",fbuffer[count]);
system("pause");
return 0;
}
//(data.dat contains 2 short lines of text)
HTH，
--ag
-
Artie Gold - 德克萨斯州奥斯汀
http://it-matters.blogspot.com （新帖子12/5）
http://www.cafepress.com/goldsays
HTH,
--ag
--
Artie Gold -- Austin, Texas
http://it-matters.blogspot.com (new post 12/5)
http://www.cafepress.com/goldsays
>问题1：什么是'count''？
> Question 1: What is `count''?
问题2：假设`count''在某处被定义，那么`fbuffer [count]'指向什么？ [提示，没有内存已分配给
Question 2: Assuming `count'' is defined somewhere, what does
`fbuffer[count]'' point to? [Hint, no memory has been allocated to
它。]
对不起，原始计数用于循环，当我发布了这个
消息我删除了循环。所以假设计数为0.（在
原始来源计数中用于循环并从
0-1取得值）
fbuffer [count] *应该由fgets（）命令初始化，因为它将
存储指向字符串的指针指向第一个指定的指针
参数。
就像我说的，程序运行正常。它显示正确的字符串。
只是没有正确返回。
此外，int main（）之后的代码的第一行分配了fbuffer。
it.]
Sorry, the original count was used in a loop, and when I posted this
message I deleted the loop. So just assume count is 0. (In the
original source count was used in a loop and took on the value from
0-1)
fbuffer[count] *should* be initialized by the fgets() command, since it
stores the pointer to the string to the pointer specified in the first
argument.
Like I said, the program runs fine. It displays the right string.
Just not returning correctly.
Also, the first line of the code after int main() allocates fbuffer.
Steven写道：
问题1：什么是`count''？
问题2：假设`count''在某处定义，那么`fbuffer [count]'指向的是什么？ [提示，没有内存已分配给
Question 1: What is `count''?
Question 2: Assuming `count'' is defined somewhere, what does
`fbuffer[count]'' point to? [Hint, no memory has been allocated to
它。
抱歉，原始计数在循环中使用，当我发布这个
fbuffer [count] *应该*由fgets（）命令初始化，因为它将指向字符串的指针存储到第一个
参数中指定的指针。
就像我说的那样，程序运行精细。它显示正确的字符串。
只是没有正确返回。
此外，int main（）之后的代码的第一行分配fbuffer。
it.]
Sorry, the original count was used in a loop, and when I posted this
message I deleted the loop. So just assume count is 0. (In the
original source count was used in a loop and took on the value from
0-1)
fbuffer[count] *should* be initialized by the fgets() command, since it
stores the pointer to the string to the pointer specified in the first
argument.
Like I said, the program runs fine. It displays the right string.
Just not returning correctly.
Also, the first line of the code after int main() allocates fbuffer.
它为fbuffer分配内存。它确实*不*将内存分配给* fbuffer中的
指针*（这是一个指针指向char的指针）。你需要
来为每一行分配内存。
HTH，
--ag
-
Artie Gold - 德克萨斯州奥斯汀
http://it-matters.blogspot.com （新帖子12/5）
http://www.cafepress.com/goldsays
It allocates memory to fbuffer. It does *not* allocate memory to the
pointers *in* fbuffer (which is a pointer-to-pointer-of-char). You need
to allocate memory for each line.
HTH,
--ag
--
Artie Gold -- Austin, Texas
http://it-matters.blogspot.com (new post 12/5)
http://www.cafepress.com/goldsays
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