#include "stdafx.h"BOOL StringReverseW(PWSTR pWideCharStr, DWORD cchLength);int _tmain(int argc, _TCHAR* argv[])
{
PWSTR pWideCharStr = _T("String");
StringReverseW(pWideCharStr,8);
printf("StringReverseW the pWideCharStr: %s",pWideCharStr);
return 0;
}//宽字节字符串颠倒算法
BOOL StringReverseW(PWSTR pWideCharStr, DWORD cchLength) { // Get a pointer to the last character in the string. cchLength:最大允许的字节数
PWSTR pEndOfStr = pWideCharStr + wcsnlen_s(pWideCharStr , cchLength) - 1;
wchar_t cCharT;
// Repeat until we reach the center character in the string.
while (pWideCharStr < pEndOfStr) { //我不知道为什么是这么判断,感觉这样不对呀?
// Save a character in a temporary variable.
cCharT = *pWideCharStr; // Put the last character in the first character.
*pWideCharStr = *pEndOfStr; //调式时候,这里会出现异常 // Put the temporary character in the last character.
*pEndOfStr = cCharT; // Move in one character from the left.
pWideCharStr++; // Move in one character from the right.
pEndOfStr--;
} // The string is reversed; return success.
return(TRUE);
}while (pWideCharStr < pEndOfStr) //我不知道为什么是这么判断,感觉这样不对呀? *pWideCharStr = *pEndOfStr; //调式时候,这里会出现异常大侠急救呀!
{
PWSTR pWideCharStr = _T("String");
StringReverseW(pWideCharStr,8);
printf("StringReverseW the pWideCharStr: %s",pWideCharStr);
return 0;
}//宽字节字符串颠倒算法
BOOL StringReverseW(PWSTR pWideCharStr, DWORD cchLength) { // Get a pointer to the last character in the string. cchLength:最大允许的字节数
PWSTR pEndOfStr = pWideCharStr + wcsnlen_s(pWideCharStr , cchLength) - 1;
wchar_t cCharT;
// Repeat until we reach the center character in the string.
while (pWideCharStr < pEndOfStr) { //我不知道为什么是这么判断,感觉这样不对呀?
// Save a character in a temporary variable.
cCharT = *pWideCharStr; // Put the last character in the first character.
*pWideCharStr = *pEndOfStr; //调式时候,这里会出现异常 // Put the temporary character in the last character.
*pEndOfStr = cCharT; // Move in one character from the left.
pWideCharStr++; // Move in one character from the right.
pEndOfStr--;
} // The string is reversed; return success.
return(TRUE);
}while (pWideCharStr < pEndOfStr) //我不知道为什么是这么判断,感觉这样不对呀? *pWideCharStr = *pEndOfStr; //调式时候,这里会出现异常大侠急救呀!
PWSTR pWideCharStr = _T("String");
改成
wchar_t pWideCharStr[] = _T("String");
试试pWideCharStr 指向的是常量,是不能改的。
printf("StringReverseW the pWideCharStr: %s",pWideCharStr)
改成
wprintf(_T("StringReverseW the pWideCharStr: %s"),pWideCharStr); 否则输出的结果只有第一个字符。
改那儿肯定是不能达到效果的。还有while (pWideCharStr < pEndOfStr) 这个表达什么意思,我不懂?麻烦也解释一下呀
PWSTR == wchar_t 关键问题是
PWSTR pWideCharStr = _T("String");
指向的字符串是在全局数据段中,是只读的,禁止对它修改的
改成
wchar_t pWideCharStr[] = _T("String");
后,字符串是放在栈里了,堆栈里的数据是可以修改的while (pWideCharStr < pEndOfStr)
是把第一个字符和最后一个字符对换,第二个字符和倒数第二个字符对换,。
楼主仔细读一下程序,慢慢就明白了
-->
WCHAR pWideCharStr[] = {_T("String")};
《C++primer》说的,呵呵给忘了。while (pWideCharStr < pEndOfStr)这个我感觉:pWideCharStr的值刚开始为所指向的整个字符串,而pEndOfStr为字符串最后面的字符,所以可以这样比较。然后每次它们移位操作,也是这样比较。呵呵,不知道对不对哦。谢谢楼上帮助。
如果理解有错,麻烦指出呀。
上面貌似写错了,应该是pWideCharStr的地址比pEndOfStr的地址小吧。
不知道对不对