CodeGuru Staff

There are many advantages to using a CView derived class over a dialog based application. Many times however there is more information than screen space or the program just needs logical seperation of elements. MDI ( Multiple Document Interface) is the standard method of achiving this but many designers do not care for it. It […]

Lib2Usr ATL component. Here is an ATL project for viewing all "classes" from a dll, tlb, or ocx, in fact library files. User can read some of informations, like functions(methods and properties) from a file, only if that file has a resource "TYPELIB"\1 in resource component. I use the LoadTypeLib file to provide a pointer […]

This article describes an ISAPI filter to allow access only to hosts with IP addresses listed in an external datasource. This sample uses a file (ipaddressdb.txt) to keep track of authorized IP addresses, but you might modify this sample to access a database which holds IP address info. For each URL request, the filter first […]

This article describes an ISAPI filter to allow access only to hosts listed in an external datasource. This sample uses a file (hostdb.txt) to keep track of authorized hostnames, but you might modify this sample to access a database which holds host info. For each URL request, the filter first looks in a cache of […]

Type libraries provide a wealth of benefits: They allow OLE/Automation clients to get to know the server’s properties and methods during compile time. Most IDE’s allow you to import typelibraries and then generate wrappers for you based on the information contained in the Type Library. For example: Class Wizard’s Import Type Library option that generates […]

#define RETURN { hr = E_FAIL; goto Cleanup; } // don’t kill me! Look at last examples of MS // under http://www.microsoft.com/data/xml // You can’t catch me! 🙂 STDMETHODIMP CGetFile::GetFile(VARIANT vFileName) { _variant_t vReturnBuffer; LPSAFEARRAY psaFile; HANDLE hFile; DWORD dwSizeOfFile; DWORD dwNumberOfBytesRead; BOOL bResult; unsigned char *pReturnBuffer = NULL; long k; HRESULT hr = S_OK; […]

MFC usually saves you a lot of time when impelmenting COM components. For example, MFC-based COM dll projects generated with AppWizard automatically provides you with the implementation of DllRegisterServer function. However, there is no DllUnregisterServer in the AppWizard generated dll. This, generally, is not acceptable, because every COM dll should support self-registration as well as […]

Having the possibility of creating a template object, like a “CMap”, with a COM interface for accessing remotly objects might come handy. Although, far from being trivial, it’s possible to achieve with ATL. The “anti-VARIANT” programmers will cheer this opportunity. Here follow step-by-step instructions to untrangle this use-to-be problem. I will use an object with […]

. When using combo boxes of type dropdown and droplist, the with of the listbox is the same as the width of the combobox. In some cases, it may be useful to have the listbox part wider then the combobox. To do this, add a handler to WM_CTLCOLOR message to your dialog or to a […]

–> Bank : This application explains component creatability with a Client application perspective. I got most of my inputs by using Microsoft Schedule+ Application . It supports lots of objects like Appointments, Alarm, Schedule, etc,. One important thing in that application is that, most of these components, any Client application can’t create as it is. […]

If you have seen VC++ 6.0 or Visual Basic 5.0 at any time you can call a list of all attributes, members of a context variable by pressing Ctrl+. The list contains many items (members) in some cases. The list cannot be filled with all the items at runtime, because it takes long time. So […]

Have you ever wondered how this #define actually works? I did too. So, I set out to research on the behavior and the result is this document. By the way, to the uninitiated, this is a new #define introduced in VC 6.0 (ATL 3.0) that you can add to your stdafx.h before including atlbase.h so […]