Tag Archives: VC++

Split Button Control

What is a split button?

In the previous post we presented the command link button control that is one of the controls introduced with Windows Vista. Another such control is the split button. This is a button that:

act like a regular button when pressed, but
display a drop-down menu when its drop-down arrow is presses

This is actually a regular button that has one of the windows styles BS_SPLITBUTTON or BS_DEFSPLITBUTTON set.

How do add a split button

If you work with Microsoft Visual Studio 2008 or newer then you can find “Split Button Control” in the resource editor toolbox. First step is to drag it from toolbox in the resource dialog template.

You can set the caption and the handler for BN_CLICKED just like with any regular push button.

void CSplitButton2008Dlg::OnBnClickedSplitCodexpert()
{
   ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro"), NULL, NULL, SW_SHOWNORMAL);
}

void CSplitButton2008Dlg::OnBnClickedSplitCodexpert()

{

ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro"), NULL, NULL, SW_SHOWNORMAL);

}

However, for the drop down menu you have to define it explicitly.

To specify what is the menu to be displayed use SetDropDownMenu.

m_buttonCodexpert.SetDropDownMenu(IDR_MENU_CODEXPERT, 0);

1	m_buttonCodexpert.SetDropDownMenu(IDR_MENU_CODEXPERT, 0);

Then, add handlers for the menu items and handle the commands.

BEGIN_MESSAGE_MAP(CSplitButton2008Dlg, CDialog)
   /* ... */
   ON_COMMAND(ID_CODEXPERT_FORUM, &CSplitButton2008Dlg::OnCodexpertForum)
   ON_COMMAND(ID_CODEXPERT_BLOG, &CSplitButton2008Dlg::OnCodexpertBlog)
   ON_COMMAND(ID_CODEXPERT_ARTICLES, &CSplitButton2008Dlg::OnCodexpertArticles)
   ON_COMMAND(ID_CODEXPERT_RESOURCES, &CSplitButton2008Dlg::OnCodexpertResources)
END_MESSAGE_MAP()

void CSplitButton2008Dlg::OnCodexpertForum()
{
   ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/forum"), NULL, NULL, SW_SHOWNORMAL);
}

void CSplitButton2008Dlg::OnCodexpertBlog()
{
   ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/blog"), NULL, NULL, SW_SHOWNORMAL);
}

void CSplitButton2008Dlg::OnCodexpertArticles()
{
   ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/articole.php"), NULL, NULL, SW_SHOWNORMAL);
}

void CSplitButton2008Dlg::OnCodexpertResources()
{
   ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/resurse.php"), NULL, NULL, SW_SHOWNORMAL);
}

BEGIN_MESSAGE_MAP(CSplitButton2008Dlg, CDialog)

/* ... */

ON_COMMAND(ID_CODEXPERT_FORUM, &CSplitButton2008Dlg::OnCodexpertForum)

ON_COMMAND(ID_CODEXPERT_BLOG, &CSplitButton2008Dlg::OnCodexpertBlog)

ON_COMMAND(ID_CODEXPERT_ARTICLES, &CSplitButton2008Dlg::OnCodexpertArticles)

ON_COMMAND(ID_CODEXPERT_RESOURCES, &CSplitButton2008Dlg::OnCodexpertResources)

END_MESSAGE_MAP()

void CSplitButton2008Dlg::OnCodexpertForum()

{

ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/forum"), NULL, NULL, SW_SHOWNORMAL);

}

void CSplitButton2008Dlg::OnCodexpertBlog()

{

ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/blog"), NULL, NULL, SW_SHOWNORMAL);

}

void CSplitButton2008Dlg::OnCodexpertArticles()

{

ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/articole.php"), NULL, NULL, SW_SHOWNORMAL);

}

void CSplitButton2008Dlg::OnCodexpertResources()

{

ShellExecute(NULL, _T("open"), _T("http://www.codexpert.ro/resurse.php"), NULL, NULL, SW_SHOWNORMAL);

}

References

Downloads

Visual Studio 2008 – Split Button Demo (1401)

Debugging Tips: Memory Leaks Isolation

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In a recent post we showed how to detect memory leaks in MFC. In this post we present some tips for breaking on a particular allocation that leaks. However, you must note that this technique only works if you are able to find a reproducible allocation, with the same number.

Here is a memory leak report:

Detected memory leaks!
Dumping objects ->
{183} normal block at 0x0036B320, 128 bytes long.
 Data:  42 61 62 61 20 53 61 66 74 61 00 CD CD CD CD CD 
Object dump complete.
The program '[1758] MyTest.exe: Native' has exited with code 0 (0x0).

Detected memory leaks!

Dumping objects ->

{183} normal block at 0x0036B320, 128 bytes long.

Data: 42 61 62 61 20 53 61 66 74 61 00 CD CD CD CD CD

Object dump complete.

The program '[1758] MyTest.exe: Native' has exited with code 0 (0x0).

The allocation number is showed in curly brackets {}, and in this case was 183.

The steps to be able to break when an allocation that leaks is created are:

Make sure you have the adequate reporting mode for memory leaks (see Finding Memory Leaks Using the CRT Library).
Run the program several times until you find reproducible allocation numbers ({183} in the example above) in the memory leaks report at the end of running the program.
Put a breakpoint somewhere at the start of the program so you can break as early as possible.
Start the application with the debugger.
When the initial breakpoint is hit, in the watch window write in the Name column: {,,msvcr90d.dll}_crtBreakAlloc, and in Value column put the allocation number that you want to investigate (in my example it would be 183).
Continue debugging (F5).
The execution stops at the specified allocation. You can use the Call Stack to navigate back to your code where the allocation was triggered.

Visual Studio 2012 available for download

codexpert blog

I see native code

Tag Archives: VC++

Split Button Control

What is a split button?

How do add a split button

References

Downloads

Like this:

Debugging Tips: Memory Leaks Isolation

Like this:

Visual Studio 2012 available for download

Like this:

What is a split button?

How do add a split button

References

Downloads

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