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Re: datagrid question azumi17-May-04 22:26 azumi 17-May-04 22:26  thx a lot, this was very helpful Event handler sreejith ss nair14-May-04 1:02 sreejith ss nair 14-May-04 1:02  hai there, i have a form with two label control. i need to click on that control. how ? using mouse right. ha ha. here i need to call the click event programatically without clicking on that control. I won't use any custom event handler here . Is it possible to control the event triggering through programmatically Sreejith S S Nair Re: Event handler Aryadip14-May-04 1:25 Aryadip 14-May-04 1:25  Hi, If you are trying to call the event delegate from any perticular place... say... you want that when you click on the first label the second lebel controls click event should trigger... if this is your plan... then you don't need to trigger an event actually... you call the delegate method directly with the necessary parameters... or incase you don't need the parameters send null. regards, Aryadip. Cheers !! and have a Funky day !! Re: Event handler sreejith ss nair14-May-04 1:44 sreejith ss nair 14-May-04 1:44  if you don't have clear picture of problem and solution please don't reply any queries. Sreejith S S Nair Re: Event handler Dave Kreskowiak14-May-04 7:40 Dave Kreskowiak 14-May-04 7:40  Hold it! Since your a beginner at this, your problem descriptions will no doubt be vague at times or completely incomprehensible, especially since your English is also not too good. I suggest you cut us some slack...If we can't understand you, we're going to ask questions and make suggestions for further clarification. If you can't provide a clear description of the problem, it's not your place to jump down someone's throat, especially if they are trying to understand and help you... ...the soapbox is now available... RageInTheMachine9532 Re: Event handler Heath Stewart14-May-04 3:15 Heath Stewart 14-May-04 3:15  If you're calling this from within a Control, you can call the undocumented protected member InvokeOnClick like so: InvokeOnClick(label1, EventArgs.Empty); Otherwise, you'll have to P/Invoke SendMessage (see http://pinvoke.net/default.aspx/user32.SendMessage[^]) and send WM_LBUTTONDOWN (0x0201) and WM_LBUTTONUP (0x0202) in sequence using the Handle property of the control for which you want to simulate a click as the first parameter to SendMessage.   Microsoft MVP, Visual C# My Articles Re: Event handler sreejith ss nair14-May-04 3:27 sreejith ss nair 14-May-04 3:27  Thanks for your this mail and your nice suggection. In future also i am expecting the same if i make any mistake. The main problem is now i have little pressure in my office. So i won't get time to tryout the queries. What normally i will do is, will give little idea that known to me. And if it is wrong i will surly appologies that. I get into dotnet through book and online material only. So this may happen. I will try my level beat to avoid this sort of problems. Sreejith S S Nair How to pass a string from c++ to c# peraonline14-May-04 0:37 peraonline 14-May-04 0:37  Hi, I must get a string from a function included into a DLL, imported in a ASP.NET page. The code: ---- Into a .aspx.cs page: //def. function included into a DLL [DllImport("WebUtility.dll", EntryPoint = "getDescr")] public static extern string getDescr(int id); //call the function: string descr=getDescr(123); --- into the c++ program, the function is definied as: char* getDescr(int id) { char* ret=new char[LUNGHEZZA_STRINGA_MEM]; strcpy(ret,oggetto[id].descr); return (ret); } If I throw the application, the server give me the error: System.NullReferenceException: Object reference not set to an instance of an object. But this error is generated not every time, but random!! some time I can view the string correctly! Why? Thanks for the help!!! Re: How to pass a string from c++ to c# Heath Stewart14-May-04 2:57 Heath Stewart 14-May-04 2:57  First of all, you don't need the EntryPoint property if the entry point is the same as the declared method name. Second, where is the NullReferenceException getting thrown? It wouldn't be thrown from string descr = getDescr(123);. Perhaps the descr is null and you're trying to call a method on it, but you should always check conditions and not assume anything, such as if an actual reference was returned (value types can never be null unless they're boxed).   Microsoft MVP, Visual C# My Articles Re: How to pass a string from c++ to c# peraonline14-May-04 3:08 peraonline 14-May-04 3:08  reply 1) there are various funcion into a DLL, so I need an Entry Point reply 2) into a DLL, descr is NEVER null, I created a function that print out a log file that contain the descr value. I don't understood because "NullReferenceException" one time get thrown and the next time no! bye Re: How to pass a string from c++ to c# Heath Stewart14-May-04 3:29 Heath Stewart 14-May-04 3:29  Trust me - I know interop in .NET. You don't need to specify the entry point if the method name is the same because the method name is used as the entry point. I wasn't talking about in your C/C++ DLL - it wouldn't throw a NullReferenceException anyway - that's thrown by the runtime. I was talking about the variable that takes the return value of getDescr called descr. If it's null and you try calling a method on it you will get a NullReferenceException. Assuming that your code "just works" is never a good practice.   Microsoft MVP, Visual C# My Articles Use lib-file in C#.NET Nilfunck13-May-04 23:42 Nilfunck 13-May-04 23:42  Hi there, I'm making this application, that need to use some methods from a lib-file. I think that the lib-file i created i VC60, but I'm not sure. How du I use this file in C#? I can't add it as a ressource. I can't use DLLImport. The lib-file and a header fil (.h) is the only files I have avalible. What to do??? I found out that I can use the files i VC60 to make an application. I the answer to my question that I have to make some kind of a wrapper class? Re: Use lib-file in C#.NET Aryadip14-May-04 1:20 Aryadip 14-May-04 1:20  hi, As far as I know, using the lib and .h file make a DLL(Win32) or a COM component using VS 6.0 and then use it in .NET regards, Aryadip. Cheers !! and have a Funky day !! Re: Use lib-file in C#.NET Nilfunck14-May-04 2:10 Nilfunck 14-May-04 2:10  You mean like a wrapper class. Re: Use lib-file in C#.NET sreejith ss nair14-May-04 2:05 sreejith ss nair 14-May-04 2:05  So you have some lib file which is created on VC. What you can do is, use tlbimp.exe (type library importer ). you will get Visual Studio .NET Command Prompt in your progarmm menu through VisIDE option. choose - MS Dotnet - Visual Studio .NET Tools -Visual Studio .NET Command Prompt There you type tlbimp.exe YourLibfile.lib /out : MyResultentDll.dll /verbose ( if you have YourLibfile.lib in your c drive and you want the resultent .dll on c drive you can simply copy the above syntax and change the file names that you required. Otherwise give the path and file name of lib file and give the path and name of resultent file.) /verbose is used to get full output info. Here you will get a .dll file and use can easily refer this in your project. Sreejith S S Nair Re: Use lib-file in C#.NET Nilfunck14-May-04 2:14 Nilfunck 14-May-04 2:14  I have tried what you are descriping and I get an error that says: "The innput file filaname.lib is not a valid type library" Re: Use lib-file in C#.NET Heath Stewart14-May-04 2:52 Heath Stewart 14-May-04 2:52  That's because a .lib file is used only during binding. If you want to P/Invoke functions, in the API documentation for those functions when it says a function is exported from, say, user32.lib, you actually use user32.dll. The .libs are documented because those are what you actually need to link against when linking your native (i.e., C/C++) application or library.   Microsoft MVP, Visual C# My Articles Re: Use lib-file in C#.NET Heath Stewart14-May-04 2:52 Heath Stewart 14-May-04 2:52  Do you have any idea what a .lib file is? It's used only for linking during the link step of compiling a native (i.e., C/C++) application or library. They cannot be used in such a way.   Microsoft MVP, Visual C# My Articles Re: Use lib-file in C#.NET Nilfunck14-May-04 3:56 Nilfunck 14-May-04 3:56  That is strange. If I include the lib-file i C++. It works! I cannot find any dll file that should contain the source. If I only colud find that my problem would be resolved. Do you have any ideas, who to find it??? Re: Use lib-file in C#.NET Heath Stewart14-May-04 4:01 Heath Stewart 14-May-04 4:01  Like I said, C/C++ use .lib files to link when you're compiling and linking your source. This resolves exports, their relative addresses, and maps them into your code. When executed, your app or library actually binds against the DLL. The .libs are only used during linking and only work in C/C++. .NET is managed environment, managed by the Common Language Runtime. There is no such linking (at least, not in that way). They are two completely different environments. I suggest you read-up on .NET at http://msdn.microsoft.com/netframework[^] and get an overview of what actually happens. If you want more specific information on P/Invoke, see Consuming Unmanaged DLL Functions[^] in the .NET Framework SDK.   Microsoft MVP, Visual C# My Articles Re: Use lib-file in C#.NET Nilfunck16-May-04 20:37 Nilfunck 16-May-04 20:37  Thanks for your answers and your time. Re: Use lib-file in C#.NET Heath Stewart14-May-04 2:53 Heath Stewart 14-May-04 2:53  You actually P/Invoke using the .dll. A .lib is used only when linking your C/C++ compiled code.   Microsoft MVP, Visual C# My Articles help about print ggl16513-May-04 23:31 ggl165 13-May-04 23:31  I want get printable area. I get them by call GetDeviceCaps. But I get the defalut printable and when I change paper size by System.Windows.Forms.PrintDialog, the printable don't modify. It still be the defalut printable area.How can I get the correct printable. Thank you very much Re: help about print Heath Stewart14-May-04 2:48 Heath Stewart 14-May-04 2:48  The printable area of a document is entirely based on your implementation. If you only want a certain region to be printed, then only print that region in your event handler for the PrintDocument.PrintPage event. If you're talking about margins, see the PageSettings.Margins property.   Microsoft MVP, Visual C# My Articles Re: help about print ggl16518-May-04 0:01 ggl165 18-May-04 0:01  Thank you. But I want to get the Printable area before the PrintDocument.PrintPage event.

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