jbaarssen / pdflibcore Goto Github PK

We get this when we're doing release builds for our Xamarin.Forms UWP app.

C:\Program Files (x86)\Microsoft SDKs\UWPNuGetPackages\microsoft.net.native.compiler\2.2.12-rel-31116-00\tools\Microsoft.NetNative.targets(809,5): error : MCG0037: MCG0037:InvalidCSharpIdentifierName Struct 'PdfLibCore.Types.FS_RECTF' in assembly 'Assembly(Name=PdfLibCore, Version=2.0.0.0, Culture=neutral, PublicKeyToken=null, Location=D:\...\ilc\in\PdfLibCore.dll)' has a field with name '<Left>k__BackingField' that is invalid. This could be because the name is obfuscated or the field is auto-implemented by the compiler. Please make sure the field name follows C# identifier conventions.

This might have some insight on how to fix the issue but I'm unclear how it would apply to PdfLibCore:
https://developercommunity.visualstudio.com/t/cant-build-release-code-mcg0037invalidcsharpidenti/526363#T-N529127

Thanks!

should be
Pdfium.FPDF_RenderPageBitmap(renderTarget.Handle, Handle, rectDest.left, rectDest.top, rectDest.width, rectDest.height, orientation, flags);

I run PDF to image converter function in MulitTask as showed below

And some time [Attempted to read or write protected memory] error raised. I m sure that Not use duplicate Folder Path in img.Save() function.

in the PdfLibCore/src/ExampleApp/Program.cs :
//SaveToJpeg(bitmap.AsBmpStream(196D, 196D), Path.Combine(destination, $"{i++}.jpeg"));
I cannot find bitmap.AsBmpStream method.

                    using (var ms = new MemoryStream())
                    {
                        img.Save(ms, ImageFormat.Jpeg);

}

By default, storage is done with 96 dpi and the quality is not good. How can I change this default to 150 or 200 Dpi to experience better quality?

In my WPF applicationn when I render PDF to image, I often have a crash :
PdfLibCore.PdfiumException: Tentative de lecture ou d'écriture de mémoire protégée. Cela indique souvent qu'une autre mémoire est endommagée. ---> System.AccessViolationException: Tentative de lecture ou d'écriture de mémoire protégée. Cela indique souvent qu'une autre mémoire est endommagée.
à PdfLibCore.Pdfium.PlatformInvoke.FPDF_RenderPageBitmap(FPDF_BITMAP bitmap, FPDF_PAGE page, Int32 start_x, Int32 start_y, Int32 size_x, Int32 size_y, PageOrientations rotate, RenderingFlags flags)
à PdfLibCore.Pdfium.FPDF_RenderPageBitmap(FPDF_BITMAP bitmap, FPDF_PAGE page, Int32 start_x, Int32 start_y, Int32 size_x, Int32 size_y, PageOrientations rotate, RenderingFlags flags)

For rendering, I use PdfiumBitmap :

var bitmap = new PdfiumBitmap(width, height, true);
pdfPage.Render(bitmap, pdfPage.Orientation, RenderingFlags.LcdText);

The crash occurs in Pdfium.cs, line 928 :

lock (Pdfium._lock)
{
try
{
Pdfium.PlatformInvoke.FPDF_RenderPageBitmap(bitmap, page, start_x, start_y, size_x, size_y, rotate, flags);
}
catch (AccessViolationException ex)
{
throw new PdfiumException((Exception) ex);
}
}

I tried to use the PdfCore library in a .NET MAUI App, and it worked only on Windows.
On Android and iOS the pdfium library is missing.
I tried to add the pdfium-binaries NuGet packages for iOS and Android in the PdfCore library but with no luck.
Can you help on this?

Hi, I have a simple avalonia window where I load a multi page pdf and provide some simple navigation. I only show one page at a time so there's a button to load the next/previous page.

However after a few clicks to the next page I crash with a:
System.AccessViolationException: 'Attempted to read or write protected memory. This is often an indication that other memory is corrupt.'
from: pdfPage.Render(bitmap, PageOrientations.Normal, RenderingFlags.LcdText);

I'm using the newest 2.4 version of the plugin.

Hello

When I import the package using nuget, I will get a warning when compiling the project

MSB3270: The generated project's processor architecture "MSIL" does not match the processor architecture "AMD64" referencing PdfLibCore.dll". This mismatch may cause runtime failures. Consider changing your project's The target processor architecture to align the processor architecture between your project and the reference, or associate a reference with a processor architecture that matches your project's target processor architecture

targetFramework: net6, aspnetcore webapi

Please how should I handle this warning

Looking forward to your reply