用WideCharToMultiByte转化完的字符串为什么后面还跟着些乱码？？

[cl781121]

转化已经对了，在正确的字符串后面总是跟着些乱码

例如
cstring gg = "测试实验"
wchar_t *tt = gg.c_str();
int cc = szLine.GetLength();
char* yye = new char[cc];
wchar_t* sz = szLine.GetBuffer();
::WideCharToMultiByte(CP_ACP,0,sz,-1, yye, cc, NULL, NULL);
这个时候 yye ="测试实验 铪铪" 多了后面的一大段空格和乱码

[cl781121]

上面写错了szLine 换成 gg


cstring gg = "测试实验"
wchar_t *tt = gg.c_str();
int cc = gg.GetLength();
char* yye = new char[cc];
wchar_t* sz = gg.GetBuffer();
::WideCharToMultiByte(CP_ACP,0,sz,-1, yye, cc, NULL, NULL);
这个时候 yye ="测试实验 铪铪" 多了后面的一大段空格和乱码

[wangyadong]

没有初始化
可以用memset初始化一下

[wangyadong]

char* yye = new char[cc];
memset(yye,cc,' ');

[长安宁]

char* yye = new char[cc];
至少这里是错的，new char[cc+1];

[「已注销」]

你需要先获取转换后的字符串长度！
给你参考一下我工程里的转换函数：

shared_ptr<wstring> UT2WC(const char* buf)
{
    int len = MultiByteToWideChar(CP_UTF8, 0, buf, -1, NULL, 0);
    if (len == 0) return shared_ptr<wstring>(new wstring(L""));

    vector<wchar_t> unicode(len);
    MultiByteToWideChar(CP_UTF8, 0, buf, -1, &unicode[0], len);

    return shared_ptr<wstring>(new wstring(&unicode[0]));
}

shared_ptr<string> WC2UT(const wchar_t* buf)
{
    int len = WideCharToMultiByte(CP_UTF8, 0, buf, -1, NULL, 0, NULL, NULL);
    if (len == 0) return shared_ptr<string>(new string(""));

    vector<char> utf8(len);
    WideCharToMultiByte(CP_UTF8, 0, buf, -1, &utf8[0], len, NULL, NULL);

    return shared_ptr<string>(new string(&utf8[0]));
}

shared_ptr<wstring> MB2WC(const char* buf)
{
    int len = MultiByteToWideChar(CP_ACP, 0, buf, -1, NULL, 0);
    if (len == 0) return shared_ptr<wstring>(new wstring(L""));

    vector<wchar_t> unicode(len);
    MultiByteToWideChar(CP_ACP, 0, buf, -1, &unicode[0], len);

    return shared_ptr<wstring>(new wstring(&unicode[0]));
}

shared_ptr<string> WC2MB(const wchar_t* buf)
{
    int len = WideCharToMultiByte(CP_ACP, 0, buf, -1, NULL, 0, NULL, NULL);
    if (len == 0) return shared_ptr<string>(new string(""));

    vector<char> utf8(len);
    WideCharToMultiByte(CP_ACP, 0, buf, -1, &utf8[0], len, NULL, NULL);

    return shared_ptr<string>(new string(&utf8[0]));
}

[kusey]

char* yye = NULL;
DWORD dwNum = WideCharToMultiByte(CP_ACP,0,sz,-1, NULL, 0, NULL, NULL);
yye = new char[dwNum];
::WideCharToMultiByte(CP_ACP,0,sz,-1, yye, dwNum, NULL, NULL);