CodeGuru Staff

There is a memory leak in the code, posted under the article : “Converting a bitmap to a region”. At the end of the BitmapToRegion function, the lines: // Clean up SelectObject(hDC, holdBmp); DeleteDC(hDC); must be changed into : // Clean u GlobalFree(hData); SelectObject(hDC, holdBmp); DeleteDC(hDC); Download source – 178KB

Carrying out a gradient fill is something very simple to do. The following code carries this out (whether you require a palette or not). Aside from this function, you need to either have a CRect attribute in the class (m_rcClient), or set the width and height of the fill in the function itself. Also, a […]

This function searches in a tree control for an item’s associated data. If an exact data match is found, the matching item is returned, otherwise, NULL is returned. HTREEITEM CTreeCtrlX::FindData(HTREEITEM hti, DWORD dwData) { if(hti == NULL) return NULL; if(GetItemData( hti ) == dwData) { Select( hti, TVGN_CARET); EnsureVisible( hti ); return hti; } hti […]

In many cases, a SnapShot(quick) ComboBox control is useful. When number of items exceds 10,000 items, filling a combobox will take a long time, and in that case a QComboBox is welcome. I am working in Windows CE environment, where the speed is a real requirement. It’s a very easy to understand how this control […]

                          “Up”, “Focused”, and “Down” bitmap                            Disabled bitmap. with five frames of animation.   Here is an actual example of an american flag button.  Notice that the first row is the “Up” state.  The Second row is the Focused  state.  It is exactly like the top row, except it has a red border around the […]

I recently needed the code which displays all Windows NT services from the service database (kept in the registry) and for each service some essential information (service name, status etc.). As always, there are at least 2 possibilities. Instead of coding in the application, I created a small class which returns a pointer to the […]

What is cardfile? If you ask this question, youe propably don’t need this dll. Anyway – the screenshot is showing Cardfile in action (with the contents of my CD-archive.) CardFile.exe came with windows 3.1 and 3.11 (maybe before) but was not included with Windows 95 and later. That is a shame because I think lot’s […]

Win32 offers several possibilities for interprocess communication (shared memory, mailslots, named pipes to name a few). Each has its advantages and disadvantages – the best one does not actually exist. This article describes how to use shared memory for interprocess communication in the following scenario: Multiple processes are communicating to one process (kind of similar […]

Introduction. This article explains how to create an MDI ActiveX document container and drive it with help of scripts. Why should you bother yourself with the ActiveX document containers? I don’t know. As for me, I just wanted to use Microsoft Office programs seamlessly in my database client programs. Most of my latest database client […]

We will also look at how to dispense with the disturbing “Server Not Responding – Switch To” and “Server Busy” dialog boxes. Introduction Not long after my first attempts at ATL and DCOM, I developed two pet hates: 1) ‘Prefab’ dialog boxes that interrupt the application and launch the taskbar START menu when the client […]

I have been using ATL extensively since it first appeared. Whilst ATL is marketed as a lightweight solution of Internet controls, it is also a very good tool for developing applications that expose their functionality via interfaces. I wanted to use the flexibility of the MFC classes along with the simplicity that ATL lends to […]

The VC++ ClassView pane of the project window displays a view of your project classes. If your project is an ATL project, then ClassView will also display your interfaces that a class supports when the class node is opened in ClassView. ClassView scans your class header file for COM_INTERFACE_ENTRY macros to determine what interfaces a […]