I am trying to experiment with Native Forms in XF. I have this in iOS working right. That is fine.
In Android, I am getting the following error:
'MainPage' does not contain a definition for 'CreateSupportFragment' and the best extension method overload 'PageExtensions.CreateSupportFragment(ContentPage, Context)' requires a receiver of type 'ContentPage'
The code is erroring in the following code:
var _cp = new MainPage(); // my page from XF.
_list = _cp.CreateSupportFragment(this);
I have made sure that my nuget packages are up to date. I have cleaned and compiled. I've done a bunch of things, but alas, no love. Any ideas on this?
TIA
you need add the line to head of source:
using Xamarin.Forms.Platform.Android
because CreateSupportFragment is an extension method defined in it.
Related
I am trying to extract thumbnails from source jpegs and save them to the file system, using the C# ImageSharp library. I see there is some mention of it in the intellisense for the component:
SixLabors.ImageSharp.Image.Metadata.ExifProfile.CreateThumbnail()
...but I can't seem to find any documentation for it or examples to call it correctly.
I did find this:
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
//method code:
Image<TPixel> thumbnail = image.Metadata.ExifProfile.CreateThumbnail<TPixel>();
https://docs.sixlabors.com/api/ImageSharp/SixLabors.ImageSharp.Metadata.Profiles.Exif.ExifProfile.html
...but I need to find where the TPixel type is to get it to work. VisualStudio doesn't recognize it and I can't seem to find a namespace or use it correctly:
"The type or namespace name 'TPixel' could not be found (are you missing a using directive or an assembly reference?)"
Legacy Windows .NET Framework could do this for System.Drawing.Image.Image.GetThumbnailImage() and it worked pretty well.
EDIT: Using tocsoft's answer, I changed the code to:
if (image.Metadata.ExifProfile != null)
{
Image<Rgba32> thumbnail = image.Metadata.ExifProfile.CreateThumbnail<Rgba32>();
thumbnail.Save(thumbnailPath, encoder);
}
...however, the image.Metadata.ExifProfile is null, which is unexpected since I know these source images have EXIF data.
EDIT: Actually, it's working now. Success! Thank you!
TPixel would be any of the pixel formats in the SixLabors.ImageSharp.PixelFormats namespace. But unless you are planning on interoperating with other systems that require the pixel data layed out in memory in specific ways you will likely just want to use Rgba32
Image<Rgba32> thumbnail = image.Metadata.ExifProfile.CreateThumbnail<Rgba32>();
According to the official document of DevExpress : https://documentation.devexpress.com/#AspNet/DevExpressWebGridViewEditingModeEnumtopic , the assembly which contains GridViewEditingMode component should be DevExpress.Web.v14.1.dll. However, I tried to add it to my reference, it still said GridViewEditingMode does not exist. The hash code of my DevExpress.Web.v14.1.dll is SHA256 CFDE95612BA9D4A771DD0236D95A8A1881BE983DC72985205E36134CA37D1075. Worse still, I don't have the project converter in my computer, nor does DevExpress provide v14.1 trial anymore.
Is there any one who knows how to make GridViewEditingMode component be available in a DevExpress v14.1 based project?
Looks like you faced this breaking change (Some classes related to DevExpress ASP.NET controls have been moved to the DevExpress.Web namespace). So, the namespace where the GridViewEditingMode enumeration is implemented was changed from DevExpress.Web.ASPxGridView to DevExpress.Web. The following code should work for you.
var grid = Html.DevExpress().GridView(settings =>
{
settings.Name = "GridView";
// code
settings.SettingsEditing.Mode = DevExpress.Web.ASPxGridView.GridViewEditingMode.EditFormAndDisplayRow;
// code
});
I am getting the following error when I try to start my Application...
[java.lang.IllegalStateException: java.lang.NullPointerException^M
at com.tivoli.pd.jutil.kb$1.run(kb$1.java:41)^M
at java.security.AccessController.doPrivileged(AccessController.java:229
)^M
at com.tivoli.pd.jutil.kb.c(kb.java:141)^M
at com.tivoli.pd.jutil.kb.(kb.java:56)^M
at com.tivoli.pd.jutil.PDContext.(PDContext.java:76)^M
at com.tivoli.pd.jazn.PDAuthorizationContext.(PDAuthorizationConte
xt.java:66)^M
I double checked the config file was accessible and I could read it. The code I am using looks as follows...
aC = new PDAuthorizationContext(cFile);
Is there a way to get more information on what is causing the NPE?
More information!!!
After debuging a bit, it appears the issue comes from this code (they use progaurd so it is a little hard to be 100% confident)...
Certificate[] arrayOfCertificate1 = ((KeyStore)???).getCertificateChain("DefaultID");
//Throws Null pointer (presumably because array is null)
Certificate localCertificate1 = arrayOfCertificate1[0];
EVEN MORE INFO
This appears to be some kind of dependency conflict (guess), because if I just create a sample App using PDAuthorizationContext it works fine.
Problem was related to the PD.jar version that I was using. Although I thought I was using one version I was using another. This was because on version was registered in my WebSphere library (under build path in eclipse). Once the proper library was introduced everything worked.
I've spent the last day trying to get a checkbox validator to work. I found some starting code on the 4GuysFromRolla website, however this was coded back in 2006 and doesn't play alongside updatepanels.
I've made changes and now it works. As I'd made quite a few changes I wanted to standardise it and use it alongside other utility classes, so I created a new class project and copied the code verbatim.
The problem is that the original works, but I get a WebResource not found error on my new class project.
The differences are: The original was a web application project:
my new project is simply a class library project.
The original assembly and namespace have changed.
Both contain a single class and a resource file (.js)
Both resource files are contained in the root directory
Both resource files are set to embed resource
I'm running out of ideas, and have exhausted the answers I've found on the web with no success.
Is there an issue with the fact that its a class library? Have I perhaps overlooked something else?
Its pretty difficult to see beyond those 2 questions because the project is so small and insignificant.
Here's the code that does work:
if (this.RenderUplevel && this.Page != null)
{
ScriptManager.RegisterClientScriptResource(Page, this.GetType(), "skmValidators.skmValidators.js");
}
Here's the code that doesn't:
if (this.RenderUplevel && Page != null)
{
ScriptManager.RegisterClientScriptResource(Page, this.GetType(), "ValidationExtender.EvaluationFunctions.js");
}
Anyone give any ideas?
Thanks in advance.
The error turned out to be a mismatch between the dll's in the test page.
I'm looking for a good tutorial on how to use modeltest to test models based on QAbstractItemModel. I don't know how to interpret debug messages that are displayed.
Also I'm having trouble configuring modeltest project to work with my app in QtCreator. Including the .pri/.pro doesn't work. I get an error saying "No rule to mage target ..". After fixing paths in modeltest/modeltest.pro file it starts to compile. But i get this wierd assertion
ASSERT: "QTest::testLogger" in file c:\ndk_buildrepos\qt-desktop\src\testlib\qtestlog.cpp, line 232
Any ideas why this happens ?
My modeltest folder is located inside my project. I added following line at the end of my *.pro file
include(modeltest/modeltest.pri)
The modeltest.pri file contains the following
load(qttest_p4)
SOURCES += modeltest/modeltest.cpp modeltest/dynamictreemodel.cpp
HEADERS += modeltest/modeltest.h modeltest/dynamictreemodel.h
I modified my code to use modeltest this way
model = new TasksModel(this);
new ModelTest(model, this);
ui->treeView->setModel(model);
TasksModel is my implementation of QAbstractItemModel model.
ui->treeView is the widget that displays data.
No other modifications where made while integrating modeltest with my app.
Qt version is 4.7.
This will sound a little overgeeky - but it is, in fact, what the ModelChecker dev intended for you to do ;) When you hit one of the asserts, go to the point in the code where it is hit and read the comments which are written along with it. The entire thing is extremely heavily commented, and describes what is breaking and likely reasons why. This is by far easiest to do if you run your app through a GUI debugger, such as that included in for example KDevelop, Qt Creator or Visual Studio.
The reason you are getting this error is because you aren't actually using the ModelTest inside a proper QTestLib test case. If you take a look at /tests/auto/modeltest (where you presumably got the modeltest class in the first place), you can see how to properly construct a test case using the ModelTest.