C++ CButton showing only bitmap icon - c++

Question

I'm using C++ on Visual Studio 2012 update 4, and I have a Dialog where I want to display a button showing a bitmap (.bmp file), without borders
I have extended CButton to add my tooltip, and so on.
Using the Resource View to open the Dialog .rc file, I set the button Property Bitmap to true. Then, from the Dialog OnInitDialog function, I used this code to set the bitmap, identified as IDB_HELP
myButton.SetBitmap((HBITMAP)LoadImage(AfxGetApp()->m_hInstance,
MAKEINTRESOURCE(IDB_HELP), IMAGE_BITMAP, 16, 16, LR_COLOR));
But it displays this and I don't want that half-border.
I tried making it Flat and Transparent in the Resource View, but it only gets uglier.
Then I tried to only draw the image by setting Owner Draw to true and then redefining DrawItem in my button class, but I can't quite figure that out either.
Any easy way to make an icon-only button?

Answer 1

You have to use owner draw button or custom draw. Below is a simple example, it uses icon instead of bitmap (it's easier to assign transparent background for it)
class CMyButton:public CButton
{
void OnPaint()
{
CPaintDC dc(this);
CRect rc = dc.m_ps.rcPaint;
dc.FillSolidRect(&rc, GetSysColor(COLOR_3DFACE));
BOOL offset = (BST_PUSHED & GetState()) ? 1 : 0;
int w = 24;
int h = 24;
HICON hicon = (HICON)LoadImage(AfxGetApp()->m_hInstance, MAKEINTRESOURCE(IDC_ICON),
IMAGE_ICON, w, h, LR_DEFAULTCOLOR);
DrawIconEx(dc, offset, offset, hicon, w, h, 0, 0, DI_NORMAL);
DestroyIcon(hicon);
}
DECLARE_MESSAGE_MAP()
};
BEGIN_MESSAGE_MAP(CMyButton, CButton)
ON_WM_PAINT()
END_MESSAGE_MAP()
Usage:
BOOL CMyDialog::OnInitDialog()
{
BOOL res = CDialogEx::OnInitDialog();
static CMyButton bn;
bn.SubclassDlgItem(IDC_BUTTON1, this);
return res;
}

Answer 2

You do NOT need to do your own icon painting algorithm if you use a CMFCButton and you are a comfortable using an ICO file instead of a BMP. Although you can directly say in your resources file a button is of this type, I do not recommend it, because it adds an unmaintainable hexadecimal piece of text on the rc file. And if you use several rc files, one for each language, it's really devilish!
So lets go. In your form class, declare a member
CMFCButton m_button1;
The DoDataExchange should look like:
void MyDialog::DoDataExchange(CDataExchange* pDX)
{
__super::DoDataExchange(pDX);
DDX_Control(pDX, IDC_BUTTON1, m_button1);
// ...
}
Then the OnInitDialog should be something like:
BOOL CMyDialog::OnInitDialog()
{
if(!__super::OnInitDialog())
return FALSE;
m_button1.m_nFlatStyle= CMFCButton::BUTTONSTYLE_NOBORDERS;
m_button1.SetIcon(IDI_HELP);
return TRUE;
}

Answer 3

Use CMFCbutton and set the border style to BUTTONSTYLE_NOBORDERS;
Use a .ico instead of png for pictures.
Also points to note:
Load the library or exe which has the icon.
Pass the dll/exe loaded handle to loadicon.
Use MFC button handle to set the icon with property set as Noborder.
Example code:
m_HResdll = LoadLibrary("C:\\Repos\\iFIX\\SCADABin\\en\\UAAClientConfigurationRes.dll");
//m_hTrustIcon = LoadIcon(m_HResdll, MAKEINTRESOURCE(IDI_ICON1));
m_hTrustIcon = (HICON)LoadImage(m_HResdll, MAKEINTRESOURCE(IDI_ICON2),1,18,22, LR_DEFAULTCOLOR);
unsigned int err = GetLastError();
m_btnTrustIcon.SetIcon(m_hTrustIcon);
this->m_btnTrustIcon.EnableWindow(true);