使用c string发送多个空字符。 ASCII装甲

Question

如何使用C字符串包含多个空字符\\ x00。

Answer 1

C's string functions (eg strlen() , printf() , etc) assume that the buffer will be null-terminated. If you have a buffer with multiple 0x00 characters, then you can't use any functions which treat 0x00 as a null character.

So instead of using, eg, strcpy() (or strncpy() ) you would use memcpy() - to move the bytes of memory from one place to another, rather than relying on this null-terminated behavior.

Answer 2

AC string is only an array of chars terminated by a null character. However, if you treat it as an array, it can contain inner null characters:

char data[4] = { 'x', '\0', 'y', '\0' };

You have to be careful, however, as most of the standard library functions will not work, as they expect an C string ending with the first null character.

For example, strlen(data) will return 1 in the example above, as it stops after the first null character.

Answer 3

All you have to do is something like

char* data = (char*)malloc( 8 ) ; // allocate space for 8 bytes
memset( data, 0, 8 ) ; // set all 8 bytes to 0's