interop - w3toppers.com

Marshal C++ struct array into C#

I would try adding some attributes to your struct decloration [StructLayout(LayoutKind.Sequential, Size=TotalBytesInStruct),Serializable] public struct LPRData { /// char[15] [MarshalAsAttribute(UnmanagedType.ByValTStr, SizeConst = 15)] public string data; /// int[15] [MarshalAsAttribute(UnmanagedType.ByValArray, SizeConst = 15)] public int[] prob; } *Note TotalBytesInStruct is not intended to represent a variable JaredPar is also correct that using the IntPtr class could be … Read more

Access x86 COM from x64 .NET

If a component is running x64-native, it can’t load a 32-bit COM server in-process, because it’s the wrong sort of process. There are a couple of solutions possible: If you can, build a 64-bit version of the COM code (which would of course register itself in the 64-bit registry). This is the cleanest solution, but … Read more

Add offset to IntPtr

In .net 4 static Add() and Subtract() methods have been added. IntPtr ptr = IntPtr.Add(oldPtr, 2); http://msdn.microsoft.com/en-us/library/system.intptr.add.aspx

COM object that has been separated from its underlying RCW cannot be used

The issue is described here: Is it safe to call an RCW from a finalizer? and here: Release Excel Object In My Destructor The trouble is that not only is the timing as to when these objects are to be garbage collected uncertain, but the order in which the finalizers are called is also nondeterministic. … Read more

Use Visual Studio Setup Project to automatically register and GAC a COM Interop DLL

Gacutil.exe won’t be available on the target machine. Not a problem, MSI can get the job done. Right-click “File System on Target Machine”, Add, GAC. Right-click that added folder, Add, Project Output. That ensures the assembly is gac-ed. It can also register the assembly like Regasm.exe does. Set the Register property of the project output … Read more

Hosting the .NET runtime in a Delphi Program

In the Jedi Code Library (JCL) – free – there is a JclDotNet.pas, containing a class TJclClrHost, probably doing what you want: TJclClrHost = class(TJclClrBase, ICorRuntimeHost) private FDefaultInterface: ICorRuntimeHost; FAppDomains: TObjectList; procedure EnumAppDomains; function GetAppDomain(const Idx: Integer): TJclClrAppDomain; function GetAppDomainCount: Integer; function GetDefaultAppDomain: IJclClrAppDomain; function GetCurrentAppDomain: IJclClrAppDomain; protected function AddAppDomain(const AppDomain: TJclClrAppDomain): Integer; function RemoveAppDomain(const … Read more

Resources for learning c# Excel interop [closed]

The article Understanding the Excel Object Model from a Visual Studio 2005 Developer’s Perspective by Ken Getz covers the Excel object model in detail. Code examples are in both VB.NET and C#. Some important caveats are covered in C# and VBA: Like Oil and Water, also by Ken Getz. I would also see the article: … Read more

Referencing Google’s V8 engine from a .NET app

I realize that this may not be an exact answer to your question, but I figured I would put my 2 cents worth in as I doubt to many people have tried this. I got it to work by created a managed wrapper using mixed mode C++. There are other ways to do it, but … Read more

Windows Forms window changes its size when I create a WPF window

You discovered that WPF calls SetProcessDPIAware(). It happens inside the module initializer for PresentationCore. Which is formally illegal, it must always be called before an app creates any windows or load DLLs that might cache the DPI value. Or in other words, lots of ways that this can go wrong, you only discovered the mild … Read more

C# – How to copy a single Excel worksheet from one workbook to another?

You could also use the Sheet.Copy() method. Basically, Sheet.copy copies the sheet, and will automatically create a new workbook at the same time. Try adding the following lines to your code, after your call to Worksheets.get_Item: // Copies sheet and puts the copy into a new workbook sheet.Copy(Type.Missing, Type.Missing); // Sets the sheet variable to … Read more