C++ STD::字符串禁止代码到C代码

// Get the number of characters in the range
size_t length = valueEnd - valueBegin;

// Allocate one more for the C style terminating 0
char *data = malloc(length + 1);

// Copy just the number of bytes requested
strncpy(data, valueBegin, length);

// Manually add the C terminating 0
data[length] = '\0';

C++代码从另一个字符串的子字符串创建新字符串。C中的类似功能是 strndup :

char *str = strndup(valueBegin, valueEnd - valueBegin);
// ...
free(str);

假设指针算法在您的情况下是合理的:

strncpy( value, valueBegin, valueEnd-valueBegin );