Question: In some app like WinSpy/Spy++ to make adjustments to list controls. It can correctly set an app’s list control’s modes, alignments, sorting, styles, and extended styles. It can also get the widths of the columns and count of items. The problem is that you cannot seem to get the columns’ names or the item [...]

Sometime you need some CEdit Validation, for example, restricting the data number only. The simple implemetion is to handle the EN_UPDATE notification message. The EN_UPDATE message is useful to handle as it caters for both normal entry and clipboard paste. You can do that in the Dialog or subclass the CEdit class. Here is an [...]

In MFC program, you’d better try to avoid using std::string. There is no compelling reason to use it in MFC, and it leads to confusion. There are some standard method to translate among Cstring ,string and char[]. // Suppose CString str; std::string s; char buf[SIZE]; // from CString to std::string s = str; // from [...]

CWnd::IsIconic BOOL IsIconic( ) const; Return Value Nonzero if CWnd is minimized; otherwise 0. Remarks Specifies whether CWnd is minimized (iconic). Example // This code, normally emitted by the AppWizard for a dialog-based // project for the dialog’s WM_PAINT handler, runs only if the // window is iconic. The window erase the icon’s area, then [...]

Problem: In the C time, we used to use sscanf to read data from string as following: char strUserName[20], strPassword[20]; // if the content of m_recvBuff is “Microsoft Bill”. sscanf((const char *)m_recvBuff, “%s %s”, strUserName, strPassword); And when you first get CString in sight, you may write the similar code: CString strUserName, strPassword; // if the [...]

How to load a bitmap from bmp file and draw it in DC? There are two main steps: Load the bitmap from the file to a memory DC. Paint the content of the memory DC to the one which display the bitmap. In MFC, there is no API to load a bitmap directly from a [...]

We often need to create an Enhanced Meta File(EMF) or Bitmap(bmp) from an existed DC draw code. It’s not very difficult but it’s boring to code again and again. The following is a simple solution, what you need to do is only to implement an IPicDrawer and call DrawEnhMeta or DrawBitmap function.

When you want to change the height of CListCtrl, you need to use an owner-draw version of CListCtrl and change the font of the control. But when you change the font of the CListCtrl, the control or its parent window does not get a chance to respecify the height of the rows and the effect will not be [...]

tag: CListCtrl, SetItemState, SetSelectionMark When you try to move the item selection of a CListCtrl object, you should remember to call SetSelectionMark. If not, the program will not work as you think. It will only work once and won’t work any longer. The reason is that even you have called SetItemState and the selection was [...]

We often meet such case: I have an application with a modeless dialog. The dialog comes up perfectly in DEBUG build, But in RELEASE build, it crashed. Such problem often occures because of incorrect signature of message handle functions, that included into MFC message map for your CWnd based class.We should very carefully check signatures [...]