[英]strtok_s crashes program when string is of char *
I am trying to get a token from a string that is delimited by space(" "). 我试图从一个由空格(“”)分隔的字符串中获取一个标记。 But the following code crashes the application when the string is of char * type. 但是当字符串是char *类型时,以下代码会崩溃应用程序。
#include <stdio.h>
#include <string.h>
int main(){
char *str1 = "Hello World!"; //char str1[] works
char *token;
char *savePtr;
token = strtok_s(str1, " ", &savePtr);
printf("%s", token);
return 0;
}
I also get the following warnings: 我还收到以下警告:
C:\Users\Haris\Desktop\C files>gcc firstProgram.c -o firstprogram.exe
firstProgram.c: In function 'main':
firstProgram.c:10:9: warning: implicit declaration of function 'strtok_s' [-Wimplicit-function-declaration]
token = strtok_s(str1, " ", &savePtr);
^
firstProgram.c:10:7: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
token = strtok_s(str1, " ", &savePtr);
The strtok_s
function modifies the thing the pointer points to, turning delimiters into zeroes. strtok_s
函数修改指针指向的东西,将分隔符转换为零。 So it cannot take a pointer to a constant. 所以它不能指向常量。 But you pass it str1
, which is a pointer to a string constant. 但是你传递str1
,它是一个指向字符串常量的指针。 When it tries to modify that string to turn the delimiters into zeroes, it tries to modify a constant. 当它尝试修改该字符串以将分隔符转换为零时,它会尝试修改常量。 That is, of course, illegal. 那当然是非法的。
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