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POCall WPF Windows from COM within a Delphi App
 

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  1. POCall WPF Windows from COM within a Delphi App
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    <p>i trying to call a COM-Object which is described here </p> <p><a href="https://stackoverflow.com/questions/2186829/is-it-possible-to-package-wpf-window-as-com-object">Is it possible to package WPF window as COM Object</a></p> <p>from a Delphi App.</p> <p>After importing the tlb, i'm using this code to call that COM Object.</p> <pre><code>var y: ITestWpfInterface; begin y:=CreateComObject(CLASS_TestWpfInterface) as ITestWpfInterface; y.TestWpf(); end; </code></pre> <p>the COM Object gets instantiated and the method is called. but the COM Objects crashes the Delphi app, when it is reaching the </p> <pre><code>Window1 form = new Window1(); </code></pre> <p>line. when i'm trying to do the same from word-VBA the wpf windows is show.</p> <pre><code>Sub test() Dim x As New WpfControlLibrary1.TestWpfInterface x.TestWpf End Sub </code></pre> <p>catch blocks around the new window does not show any exceptions. i have debugged the application with windbg. it shows me a div by 0 exception, after loading the framework wpf assembly's </p> <p>why does the delphi app crash? what causes the crash. how to solve it?</p> <p>edit: this is the output from windbg</p> <pre><code>ModLoad: 76330000 7634d000 C:\WINDOWS\system32\IMM32.DLL ModLoad: 5b0f0000 5b128000 c:\windows\system32\uxtheme.dll ModLoad: 75250000 7527e000 C:\WINDOWS\system32\msctfime.ime ModLoad: 76f90000 7700f000 C:\WINDOWS\system32\CLBCATQ.DLL ModLoad: 77010000 770e3000 C:\WINDOWS\system32\COMRes.dll ModLoad: 79000000 7904a000 C:\WINDOWS\system32\mscoree.dll ModLoad: 603b0000 60417000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\mscoreei.dll ModLoad: 76970000 76a21000 C:\WINDOWS\system32\sxs.dll ModLoad: 79140000 797ae000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\clr.dll ModLoad: 79060000 7911e000 C:\WINDOWS\system32\MSVCR100_CLR0400.dll ModLoad: 77f40000 77fb6000 C:\WINDOWS\system32\SHLWAPI.dll (2b4.244): Unknown exception - code 04242420 (first chance) ModLoad: 79880000 7a641000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\mscorlib\a774bd593b8420bae4a8cf1d46af3ba2\mscorlib.ni.dll ModLoad: 60340000 6034d000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\culture.dll ModLoad: 60930000 60940000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\nlssorting.dll ModLoad: 03270000 03549000 C:\WINDOWS\system32\xpsp2res.dll ModLoad: 79810000 79870000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\clrjit.dll ModLoad: 7a830000 7b0dd000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\System\5286fe2d0167eb835a9f11025f1cb756\System.ni.dll ModLoad: 58c20000 58fd1000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\WindowsBase\9dacf8a5033dfbcb435be166d2f42cdf\WindowsBase.ni.dll ModLoad: 68000000 68036000 C:\WINDOWS\system32\rsaenh.dll ModLoad: 55590000 5607d000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\PresentationCore\8244412387a82c0acd3d63622e22cef5\PresentationCore.ni.dll ModLoad: 56980000 57aad000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\PresentationFramewo#\813a0913bea1269e48613509609e72b4\PresentationFramework.ni.dll ModLoad: 561c0000 562a1000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\WPF\wpftxt_v0400.dll ModLoad: 55000000 5519a000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\WPF\wpfgfx_v0400.dll ModLoad: 554c0000 55585000 C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\WPF\PresentationNative_v0400.dll ModLoad: 59200000 593b5000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\System.Xaml\a3ffdc1316821b5ceb32c9a788334329\System.Xaml.ni.dll ModLoad: 60c90000 60d83000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\System.Configuration\4844dd28e0611d1ebd1e449fe822c2a5\System.Configuration.ni.dll ModLoad: 69760000 69cbe000 C:\WINDOWS\assembly\NativeImages_v4.0.30319_32\System.Xml\419103071a5a5d17738afbe9dd03d58a\System.Xml.ni.dll (2b4.244): Unknown exception - code c0000090 (first chance) (2b4.244): Unknown exception - code c0000090 (first chance) (2b4.244): Unknown exception - code c0000090 (first chance) eax=000000c0 ebx=00007530 ecx=001b1e30 edx=00000020 esi=00000000 edi=0374ff50 eip=7c91e514 esp=0374ff20 ebp=0374ff78 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000206 ntdll!KiFastSystemCallRet: 7c91e514 c3 ret </code></pre> <p>a German version of this question inclusive sample code can found here: <a href="http://www.delphipraxis.net/166199-com-interop-mit-einer-c-library-mit-wpf-und-com.html" rel="nofollow noreferrer">http://www.delphipraxis.net/166199-com-interop-mit-einer-c-library-mit-wpf-und-com.html</a></p>
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    1. COdid you try to import the COM object as a component in delphi?
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    2. COi tried both early and late bindings. both crashes that app. crash = instant close of the delphi app.
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    3. COwithout register the com object with regasm it is not possible to get an instance of the object. regasm is also used to generate the tlb. this tlb is imported into delphi. everything is fine, except dotnet is creating the wpf window.
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