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androiddelphidelphi-xe7

How can I load resourcesting

I am using XE7 Rad Studio to build "apps" for Android and IPhone. Focusing on Android for the moment.

According to the requirements, I need to load the HTML inside the application as a resource string.

WebBrowser1.LoadFromStrings(ResourceStrings.HTMLString,'');
//Loads the resource-string successfully.

However in this resource-string I need to load images, and I cant figure out how to do it. I can see in deployment that I have the images loaded into the project {Bitmap_1, Bitmap_2,Bitmap_3}.

How do I complete this line:

resource-string:

...'<a href="/images/im2.bmp"><img id="img2" class="thumbnail" src="/images/im2.bmp" alt="/images/im2.bmp"/></a>'...

Many thanks.

Solution

  • If you read the documentation for LoadFromStrings(), it says:

    Displays HTML string content within the TWebBrowser component.

    This method uses the following parameters:

    • Content: specifies the HTML string to be displayed.

    • BaseUrl: specifies a path that is used to resolve relative URLs within the loaded page. To clarify, consider the following scenario: this parameter is set to www.mycompany.com/departments/, and the loaded page defines a link <a href=’Sales.html’>Sales dept</a>. In the given case, clicking this link opens http:// www.mycompany.com/departments/Sales.html.

    That is the exact scenario you are running into. Your HTML contains relative links to external images, but you are not providing a BaseURL, so the WebBrowser cannot resolve the correct URLs it needs to load those images.

    In the Deployment Manager, set the Remote Path of your image files to either StartUp/Documents/images/ or StartUp/Library/Application Support/images/. At app startup, Delphi will copy files beginning with StartUp to the appropriate folder on the device. Then you can do the following when calling LoadFromStrings():

    // note sure which function to use for 'StartUp/Library/Application Support/',
// maybe TPath.GetLibraryPath()? This example is for '/StartUp/Documents/'...
WebBrowser1.LoadFromStrings(ResourceStrings.HTMLString, 'file://' + TPath.GetDocumentsPath);

    That will allow "/images/im2.bmp" to resolve to something like file:///data/data/<application ID>/files/images/im2.bmp", etc.