c不熟悉，可能有语法错

void Reverse( char* lpszText, int nLength ) {
char tmp;

char* c1 = lpszText;
char* c2 = c1 + nLength - 1;

while (c1 != c2) {
tmp = *c2;
*c2 = *c1;
*c1 = tmp;
}
}