如何在「適用於Windows Embedded（Compact 2013）的XAML」中切換圖像

Question

我有一個針對Windows CE的項目，該項目爲GUI使用XAML for Windows Embedded (Compact 2013)（也稱爲「Windows Embedded的Silverlight」）。

我在xaml中定義了一個圖像，現在我想在部分後面的C++代碼中切換此圖像。

我該怎麼做？

Answer 1

我發現此解決方案：

m_pBatteryStateImage是圖像，在XAML定義。

爲圖像中的URI可以在自動找到生成的文件PROJECTNAMEGenerated.rc2

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; 
}