PathBreaker - WTL utility to easily edit PATH-like strings

void CEnvironDlg::LoadUserSettings()
{
    m_UserRegItems.RemoveAll();
    
    HKEY hEnviron;
    long ret = RegOpenKeyEx(HKEY_CURRENT_USER, _T("Environment"), 0, KEY_READ, &hEnviron);
    if (ret != ERROR_SUCCESS)
        return;
    
    DWORD index = 0;
    for (;; )
    {
        TCHAR szValueName[256];
        DWORD cbValue = 256;
        BYTE szData[1024];
        DWORD cbData = 1024;
        DWORD dwType;
        if (RegEnumValue(hEnviron, index, szValueName, &cbValue, NULL, &dwType, szData, &cbData) != ERROR_SUCCESS)
            break;
        
        m_UserRegItems.Add(CRegItem(szValueName, dwType, szData, cbData));
        index ++;
    }
    
    RegCloseKey(hEnviron);
}

void CEnvironDlg::WriteUserSettings()
{
    long ret;
    int i, c;
    HKEY hEnviron;

    ret = RegOpenKeyEx(HKEY_CURRENT_USER, _T("Environment"), 0, KEY_ALL_ACCESS, &hEnviron);
    if (ret != ERROR_SUCCESS)
        return;

    DWORD index = 0;
    for (;; )
    {
        TCHAR szValueName[256];
        DWORD cbValue = 256;
        BYTE szData[1024];
        DWORD cbData = 1024;
        DWORD dwType;
        if (RegEnumValue(hEnviron, index, szValueName, &cbValue, NULL, &dwType, szData, &cbData) != ERROR_SUCCESS)
            break;

        ret = RegDeleteValue(hEnviron, szValueName);
    }

    if (ret == 0)
    {
        c = m_UserRegItems.GetSize();
        for (i = 0; i < c; i ++)
        {
            CRegItem item = m_UserRegItems[i];
            if ((ret = RegSetValueEx(hEnviron, item.szValue, NULL, item.dwType, item.bData, item.cbData)) != ERROR_SUCCESS)
                TRACE("RegSetValue error with %s (ret=%d)\n", item.szValue, ret);
        }
    }
    
    RegCloseKey(hEnviron);
}

void CEnvironDlg::LoadSystemSettings()
{
    m_SystemRegItems.RemoveAll();
    
    HKEY hEnviron;
    long ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE, "System\\ControlSet001\\Control\\Session Manager\\Environment", 0, KEY_READ, &hEnviron);
    if (ret != ERROR_SUCCESS)
        return;
    
    DWORD index = 0;
    for (;; )
    {
        TCHAR szValueName[256];
        DWORD cbValue = 256;
        BYTE szData[1024];
        DWORD cbData = 1024;
        DWORD dwType;
        if (RegEnumValue(hEnviron, index, szValueName, &cbValue, NULL, &dwType, szData, &cbData) != ERROR_SUCCESS)
            break;
        
        m_SystemRegItems.Add(CRegItem(szValueName, dwType, szData, cbData));
        index ++;
    }
    
    RegCloseKey(hEnviron);
}

void CEnvironDlg::WriteSystemSettings()
{
    long ret;
    int i, c;
    HKEY hEnviron;

    ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE, "System\\ControlSet001\\Control\\Session Manager\\Environment", 0, KEY_ALL_ACCESS, &hEnviron);
    if (ret != ERROR_SUCCESS)
        return;

    DWORD index = 0;
    for (;; )
    {
        TCHAR szValueName[256];
        DWORD cbValue = 256;
        BYTE szData[1024];
        DWORD cbData = 1024;
        DWORD dwType;
        if (RegEnumValue(hEnviron, index, szValueName, &cbValue, NULL, &dwType, szData, &cbData) != ERROR_SUCCESS)
            break;

        ret = RegDeleteValue(hEnviron, szValueName);
    }

    if (ret == 0)
    {
        c = m_SystemRegItems.GetSize();
        for (i = 0; i < c; i ++)
        {
            CRegItem item = m_SystemRegItems[i];
            if ((ret = RegSetValueEx(hEnviron, item.szValue, NULL, item.dwType, item.bData, item.cbData)) != ERROR_SUCCESS)
                TRACE("RegSetValue error with %s (ret=%d)\n", item.szValue, ret);
        }
    }
    
    RegCloseKey(hEnviron);
}

SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE, 0,<br />
    (LPARAM) "Environment", SMTO_ABORTIFHUNG,<br />
    5000, &dwReturnValue);