Amit11's Q&A profile

• Visual C++ Function pointers and delegates

  I'm trying to build a managed wrapper in C++/CLI for an existing static library written in C. I have a class where a few callbacks are needed. In the static library you have a function called "set" which registers the callback. However I'm strugling with some managed vs. unmanaged type problems. Lets say you have a callback with the following prototype: void f1proc(char *szString, int nSomeOtherData); Since I want to use String ^ instead of char * in the managed class I think I need to do the following: 1. Create a function with above prototype in my wrapper class. 2. Expose another function (as a delegate) which has similar prototype but us ...Show All

• Architecture workflow engine and rule engine performance

  Please give me your criticakl comments on performance degradation issues arising out of usage ofworkflow and rule engine vis a vis increase in scalability and agility I think that at the end of the day it doesn't matter what performance degradation (if any) you have - it only matters does the architectural appraoch of workflows and/or rule engine fits your solution. for example, for business rules do you have complex business rules does your business rules change frequently, do you have a lot of business rules . Once you decide this is the right direction - you need to evaluate the performance and scala ...Show All

• .NET Development Video/Audio streaming in .NET C#/C++/VB possibility?

  Hi there, I was googling, however unfortunatelly could not find anything useful in terms of Video/Audio Streaming (webcam to webcam) using .NET C++/C# or VB. I need to develop an application that will allow for cam-to-cam video/audio streaming, if possible any links or hints will be great. Thank you There is nothing inherently built into any concept of streaming. When a producer produces content, a subscriber consumes the content without having to wait until all the data is transfered. What .NET /C# gives you is the ability to transfer data to and from. I am not sure why you want to tranfer video from ...Show All

• SQL Server June CTP - How to inspect for Empty String

  Thanks for your response but neither option work. I did confirm that Len(field.Value) is 0 by displaying on the report. For some reason when used in the IIf function, the comparison, Len(field.Value) = 0 fails. System.String.IsNullOrEmpty(Fields!Variable.Value) also does not evaluate to true when the string is empty. ...Show All

• Windows Forms Binding to Radio Buttons in a Group Box

  I have a few radio buttons in a group box and want to bind data to them all as a group, like if value "3" is the current value in the record, select the third radio button, etc. It's all so easy in ASP.NET with RadioButtonLists, but this Windows stuff is a little new to me.  Does anyone have any good resources for binding to&nb ...Show All

• Visual C++ msvcr80.dll Problem

  Hi there, can someone possibly tell me why Noton WinDoctor is telling me that 10 executables in the .NET Framework 2.0 cannot access the necessary dll file msvcr80.dll I see that the dll exists in the WinSxS directory and I'm running XP pro. I didn't have this problem until I downloaded the 2.0 framework at windows update. Any advice appreciated. Thanks. Naolin I am having the same problem... I even uninstalled it.. and it didnt show a problem then I reinstalled the update and it showed up as a problem in the Windoctor again... any ideas as to what is wrong with this update Im sure its a simpl ...Show All

• Windows Forms Icons in TreeView disappear in WinXP

  I uses icons in a TreeView. When the program runs in Windows 2003, it looks fine; but the icons disappear when the same program runs in windows xp. The program is built in Whidbey Beta2. In Beta1, this problem does not exist. If You have Application.EnableVisualStyles() in code remove it. It has helped me For more details look this: http://rungesrand.blogspot.com/2007/09/what-happened-to-treeview-icons.html ...Show All

• SQL Server Error installing SQL Server 2005 Express Manager

  Hello everyone, My name is Pete and I'm new to this forum.  Today, I installed Microsoft .Net Framework 2.0 and SQL Server 2005 Express June CTP.  The following error pops up when I attempt to install SQL Server 2005 Express Manager: "The installer encountered an unexpected error installing this package.  This may indicate a problem with this package.  The error code is 2755" I've downloaded this package several times and reinstalled it with no such luck. Did anyone experience this same problem when you tried to install SQL Server Express Manager Thank you for your answers Peter Hi Dan, I was able to successfully ...Show All

• .NET Development How can I write my SQL Connection for my application?

  Hi I have been developing one database application in VC++ .NET with SQL Server 2000. The Software have more child forms for the related databases and its record navigation functions. Now I want to make SQL Connection as global for all the child forms to avoid connection while loading the child form. Because its taking more time. Please give your sample code and suggestion. Where I can get sample code Thanks Joseph TA Email: joseta@vsnl.com Tel: 0024398356388/00243817300066 Kinshasa,DR Congo Hi, You could try creating a class with a static variable connection object... ref class Globals { public:    static SqlConnecti ...Show All

• Visual Studio Express Editions Grid Control In VB Express

  Hello All, I have a bit of a problem here. I am in need of an unbound .Net Grid Control. There does not seem to be a grid control available in Express. I am trying to recreate the Permissions/Change Owner form in MS Access. In my VB6 version of this form I used the MS Flex Grid control. I am trying to stick to using native .Net controls in my design. Does anyone know of an unbound .Net grid control, or possibly have a suggestion for an alternate control that I can use for my purpose. I known there is a Data Grid control in Express. Can this control be used in an ubound mode and populated manually I known there is a Data Grid control in E ...Show All

• Smart Device Development small bug with List Control in vs 8

  Hi all, I'am using vs 8 beta 2. Today, i made a very simple program with List Control. I did like that: 1) From vs 8, create a MFC program for pocket pc 2003 based Dialog. 2) In Dialog, using toolbox to add List Control to Dialog. 3) Now, you can choose the List control, click right -mouse to go to    properties page. 4) In Properties pae, choose tag controls events, go to LVN_ITEMACTIVE     then, click Add <...> 5) Now, vs 8 will help you automaticly to create a WM_NOTIFY each times     you active an items. 6) But look carefully to source code vs created:     ...Show All

• Windows Forms Validation

  Hi all, I have a form with a bunch of controls. Most of these controls have Validating event handlers. I don't want these event handlers fired when I close the form. How can I do this Thanks. Dear Jacob, Thanks for your reply. I however could manage to get what I wanted done by just setting e.Cancel = false in my Window Closing event  ...Show All

• SQL Server SSIS Runtime Object could not be created error:

  I am using SQL Server 2005 Version 9.00.1399.06 (Intel X86). Whether I try to start a new Integration Services project in Visual Studio or try to import data into a database I receive the following error: SSIS Runtime Object could not be created. Verify the DTS.dll is available and registered. The wizard can not continue and will terminate. Unable to cast COM of type 'Microsoft.SqlServer.DTS.Runtime.Wrapper.PackageNeutralClass' to interface type 'Microsoft .SqlServer.DTS.Runtime.Wrapper.IDTSContainer90' This operation failed because the QueryInterface call on the COM component for the interface failed due to the following error: ...Show All

• SQL Server Joining two fields to single field

  If I have a database table with the following columns: ID Other_ID Description And I want to join the two ID fields to one field in another table that contains the following fields: ID Name How would i do that Here is some sample data and what I would like returned TABLE1 ID Other_ID Description row 1 1 2 Number1 row 2 3 1 Number2 TABLE2 ID Name row 1 1 John row 2 2 Bob row 3 3 Bill I want to query TABLE1, row 1 so that I pull back the N ...Show All

• Windows Forms many-to-one relationships

  Are many-to-one relationships possilble with ADO.Net datasets I have an orders table in a datagrid. The orders table contains a customer ID field. As the user scrolls the table, I would like to have a textbox outside the grid reflect the customer NAME field from the customer table. This is sort of a classic lookup concept, but I can't seem to figure&n ...Show All