如何在“ Windows Embedded的XAML（Compact 2013）”中切换图像

Question

我有一个Windows CE项目，该项目将XAML用于Windows Embedded（紧凑版2013） （也称为“用于Windows Embedded的Silverlight”）用于GUI。

我在xaml中定义了一个图像，现在我想在部分后面的c ++代码中切换此图像。

我该怎么做呢？

Answer 1

我找到了这个解决方案：

m_pBatteryStateImage是在Xaml中定义的图像。

可以在自动生成的文件PROJECTNAMEGenerated.rc2找到图像的URI。

void MainPage::SetBatteryState(BatteryStateFlags batteryState)
{

    BSTR src = GetImageSourceUri(batteryState);
    SetImage(src);
}

void MainPage::SetImage(BSTR src)
{
    IXRApplication* application;
    App::GetApplication(&application);
    //Check which uri is currently used:
    BSTR originalSrc;
    IXRImageSource* iSource;
    m_pBatteryStateImage->GetSource(&iSource);
    IXRBitmapImagePtr bmpSrc = (IXRBitmapImagePtr)iSource;
    bmpSrc->GetUriSource(&originalSrc);
    //Set new image if source uri is different
    if (wcscmp(originalSrc,src)!=0) 
    {
        IXRBitmapImagePtr bitmapImage;
        application->CreateObject(IID_IXRBitmapImage, &bitmapImage);
        bitmapImage->SetUriSource(src);
        m_pBatteryStateImage->SetSource(bitmapImage);
    }
}

BSTR MainPage::GetImageSourceUri(BatteryStateFlags batteryState)
{
    BSTR src; 
    //see PROJECTNAMEGenerated.rc2 - the numbers will change if images are added (they are alphabetically sorted).
    //TODO make it robust against changes
    if(batteryState & BatteryChargerError)
        src = TEXT("#105"); 
    else if(batteryState &  BatteryHigh)
        src = TEXT("#106");
    else if(batteryState & BatteryLow)
        src = TEXT("#109");
    else
        //Show error if nothing else matches (Should not happen)
        src = TEXT("#105");
    return src;
}