简单的资源管理器

• 下载源代码文件 - 1.78 Kb

引言

我创建了这个类是为了帮助我在运行时加载不同的资源 DLL（如果存在）。例如，一个多语言应用程序。如果存在另一个资源 DLL（其名称在编译时指定），它可以将其加载并用作应用程序的资源。

让我们看一下类的头文件。它非常简单，我认为注释很好地描述了各个方法。

class CResourceManager  
{
// Operations
public:

    // Constructor
    CResourceManager();

    // Destructor
    virtual ~CResourceManager();

    // Load external resource dll. If file not present or unable to load,
    // it returns FALSE. If it is present, it is loaded but does not affect
    // the default resource of the application. You should call this if you
    // want to manage the current application resource and an external one.
    BOOL Setup(CString);

    // Load external resource dll and set it as default for application.
    // Before setting as default, the current resource handle is stored
    // in case when you need to access the resource there.
    // If file not present or unable to load, the current application
    // resource is being used. 
    BOOL SetupEx(CString);

    // Get string from string table of external resource if any
    // If there is an external resource loaded, GetString will retrieve from
    // there. If not, it will retrieve from the application default resource.
    CString GetString(UINT);

// Attributes
private:

    HINSTANCE m_hExternalResource; // Handle to external resource loaded
    HINSTANCE m_hApplicationResource; // Handle to current application resource
};

使用代码

下面是一个如何使用类的方法的示例。首先，您需要创建一个 CResourceManager 对象。您可以将其放在全局或作为应用程序类的成员。然后，如以下所示，在 InitInstance(...) 中调用 Setup(...) 方法。

BOOL CtestApp::InitInstance()
{
    // InitCommonControls() is required on Windows XP if an application
    // manifest specifies use of ComCtl32.dll version 6 or later to enable
    // visual styles.  Otherwise, any window creation will fail.
    InitCommonControls();

    CWinApp::InitInstance();

    // Initialize OLE libraries
    if (!AfxOleInit())
    {
        AfxMessageBox(IDP_OLE_INIT_FAILED);
        return FALSE;
    }
    AfxEnableControlContainer();



    // Load and set the specified resource dll as default if it is present.
    // Normally the location of the dll would be the same as the executable
    // and you would need to determine it with GetModuleFileName(...), but
    // in this case, i assume i know where the dll is located.
    m_oResourceManager.SetupEx(_T("C:\\MyProjects\\anotherres.dll"));

    .
    .
    .
    
    // The one and only window has been initialized, so show and update it
    m_pMainWnd->ShowWindow(SW_SHOW);
    m_pMainWnd->UpdateWindow();
    // call DragAcceptFiles only if there's a suffix
    //  In an SDI app, this should occur after ProcessShellCommand
    return TRUE;
}

至于清理加载的资源 DLL，析构函数将处理它，如下所示。

CResourceManager::~CResourceManager()
{
    // Check if handle is valid, free library
    if (m_hExternalResource != NULL)
        FreeLibrary(m_hExternalResource);

    // Init handles
    m_hExternalResource = NULL;
    m_hApplicationResource = NULL;
}

关注点

我承认这个类在处理其他资源问题方面有所不足，但如果您愿意，可以随意扩展它。:)