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POCalling a C++ dll from reporting services report
 

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  1. POCalling a C++ dll from reporting services report
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    <p>My company currently has a product that uses crystal reports. These reports make a call out to a custom C++ dll (CRUFL) with a lot of business logic for populating certain fields on the crystal reports. My company wishes to have the product switched to use Reporting Services instead of crystal reports and I have been tasked with investigating how to re-use the CRUFL dll with reporting services.</p> <p>My following question deals specifically with the investigation path I've taken so far, but I would be more than open to any and all suggestions on how else to solve this issue.</p> <p>On another product we already use reporting services and make custom code calls from the rdl files to a C# dll. Armed with this knowledge, I thought I should be able to write a C# wrapper dll that makes P\Invoke calls to the C++ dll.</p> <p>I started by writing my own C++ code (to keep it simple) and added a very basic method to return some text (it may be clear that I know only the most basic of C++). In my CPPFile.cpp I have:</p> <pre><code>extern "C" { __declspec(dllexport) void ReturnTextFromDLL(char* &amp; rtnStr) { rtnStr = "Some return string from inside the cpp dll! \n"; } } </code></pre> <p>I then wrote a C# wrapper both containing the call to the c++ method above as well as a testing method that doesn't make a call to c++:</p> <pre><code>public static class WrapperClass { [DllImport("TestCPP.dll")] public static extern void ReturnTextFromDLL(out string output); public static string DisplayHardcodedText() { return "Some hardcoded text in WrapperClass"; } } </code></pre> <p>Now, I created a simple RDL with two textboxes. Under Report Properties, I added a reference to my C# dll (CSharpWrapper) and added the following under code:</p> <pre><code>Shared Function GetTextFromCPP() As String Dim rtnStr As String = "" CSharpWrapper.WrapperClass.ReturnTextFromDLL(rtnStr) Return rtnStr End Function Shared Function GetHardCodedTextFromWrapper() As String Return CSharpWrapper.WrapperClass.DisplayHardcodedText() End Function </code></pre> <p>For the textboxes' Expression, I have:</p> <p><code>=Code.GetTextFromCPP()</code></p> <p>and</p> <p><code>=Code.GetHardCodedTextFromWrapper()</code></p> <p>I also copied both the C++ and C# dll into my \Common7\IDE\PublicAssemblies.</p> <p>When I preview the report, the textbox that calls GetHardCodedTextFromWrapper() displays 'Some hardcoded text in WrapperClass'.</p> <p>However, the textbox that should be displaying the text from the C++ method only shows "#Error". In the output window I get:</p> <blockquote> <p>"The Value expression for the textrun 'Textbox2.Paragraphs[0].TextRuns[0]' contains an error: System.Security.Permissions.SecurityPermission"</p> </blockquote> <p>I did take this one step back and tested outside of reporting services by writing a quick C# console application and it worked without issues.</p> <p>I also tried fully deploying the report with the report manager &amp; deploying my dlls to the \ReportServer\bin but it gave the exact same result.</p> <p>So I guess what I'm asking is if it is even possible in reporting services to do this? If so, what do I need to do to get passed the SecurityPermission?</p> <p>Thanks in advance for any help with this issue.</p>
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    1. COYou might want to put a c# wrapper on the p/invoke and put some try catch around it to see if any exceptions were thrown. You may also be able to use Debugger.Launch() or Debugger.Break() to attach your debugger.
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