无法从注册表中读取中文？

Question

mfc//写入
CString strName;
CString strPwd;
CString strPath; bool strIsExist = false;         GetDlgItem(IDC_EDIT1)->GetWindowText(strName);
GetDlgItem(IDC_EDIT2)->GetWindowText(strPwd);
GetDlgItem(IDC_EDIT3)->GetWindowText(strPath); //服务器验证帐号密码
//if()
//{
//
//}else
//{
//获取监视目录下所有文件信息，上传服务器，记录注册表
//初始化注册表
HKEY hkey; if (RegOpenKeyEx(HKEY_CURRENT_USER, _T("Software\\ShiYiZhong\\Settings"), 0, KEY_ALL_ACCESS, &hkey)!= ERROR_SUCCESS)
{
VERIFY(!RegCreateKey(HKEY_CURRENT_USER, _T("Software\\ShiYiZhong\\Settings"), &hkey));
}
VERIFY(!RegSetValueEx(hkey, _T("_IsExist"), 0, REG_DWORD, (BYTE *)&strIsExist, 4));
VERIFY(!RegSetValueEx(hkey, _T("_Name"), 0, REG_SZ, (BYTE *)strName.GetBuffer(strName.GetLength()), 500));
VERIFY(!RegSetValueEx(hkey, _T("_Pwd"), 0, REG_SZ, (BYTE *)strPwd.GetBuffer(strPwd.GetLength()), 500));
VERIFY(!RegSetValueEx(hkey, _T("_Path"), 0, REG_SZ, (BYTE *)strPath.GetBuffer(strPath.GetLength()), 500));
RegCloseKey(hkey);
//}//读取
        unsigned char  chbuf[500];        DWORD type(0);
        DWORD len(500);
        memset(chbuf, 0, sizeof(chbuf));
    
        if (RegOpenKeyEx(HKEY_CURRENT_USER, _T("Software\\ShiYiZhong\\Settings"), 0, KEY_ALL_ACCESS, &hkey) == ERROR_SUCCESS)
        {        
                if (RegQueryValueEx(hkey, _T("_Name"), 0, &type, chbuf, &len) == ERROR_SUCCESS)
                {
                        strName.Format("%s", chbuf);
                }
                if (!RegQueryValueEx(hkey, _T("_Pwd"), 0, &type, chbuf, &len))
                {
                        strPwd.Format("%s", chbuf);
                }
                if (!RegQueryValueEx(hkey, _T("_Path"), 0, &type, chbuf, &len))
                {
                        strPath.Format("%s", chbuf);
                }
                if (!RegQueryValueEx(hkey, _T("_IsExist"), 0, &type, chbuf, &len))
                {
                        strIsExist = chbuf[0];
                }                RegCloseKey(hkey);
        }

Answer 1

中文写入可以，读取出来时strPath.Format("%s", chbuf); 中的chbuf为空，不知道为什么？

Answer 2

                if (RegQueryValueEx(hkey, _T("_Name"), 0, &type, chbuf, &len) == ERROR_SUCCESS)
                {
                        strName.Format("%s", chbuf);
                }
                if (!RegQueryValueEx(hkey, _T("_Pwd"), 0, &type, chbuf, &len))
                {
len = 500;
                        strPwd.Format("%s", chbuf);
                }
                if (!RegQueryValueEx(hkey, _T("_Path"), 0, &type, chbuf, &len))
                {
len = 500;
                        strPath.Format("%s", chbuf);
                }
                if (!RegQueryValueEx(hkey, _T("_IsExist"), 0, &type, chbuf, &len))
                {
len = 500;
                        strIsExist = chbuf[0];
                }RegQueryValueEx()调用后会改改len的值,每次要重新赋值.

Answer 3

错了.应该是这样if (RegQueryValueEx(hkey, _T("_Name"), 0, &type, chbuf, &len) == ERROR_SUCCESS)
{
strName.Format("%s", chbuf);
}len = 500;
if (!RegQueryValueEx(hkey, _T("_Pwd"), 0, &type, chbuf, &len))
{ strPwd.Format("%s", chbuf);
}len = 500;
if (!RegQueryValueEx(hkey, _T("_Path"), 0, &type, chbuf, &len))
{ strPath.Format("%s", chbuf);
}len = 500;
if (!RegQueryValueEx(hkey, _T("_IsExist"), 0, &type, chbuf, &len))
{ strIsExist = chbuf[0];
}