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Comments and Discussions
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Can you add a video of a step-by-step solution? Thank you very much.
-obliviga
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You should add a video. Thanks.
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How I change the background color of a Static Control (on the dialog) to the color of the bitmap (it's a gradient one, so i can't set static control background to bitmap color. Transparent background take dialog color, not image one)?
10x
Sandro
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Hi Nishant,
Very nice article. I am new to VC++ and wanted to apply dialog a stretch background image. Your article resolved it. More to that I want to apply stretch background image to button. How can I achieve this?
Thanks,
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Hi,
How can we implement image background in win32 (dailog based) application ?
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Hi,
Is it possible to change the bitmap?
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Why I got this error message when try to build my project? Did I miss some step?
Sorry, my mistake...  it is really helpful. great job.
Thanks a lot.
modified on Thursday, April 3, 2008 8:54 PM
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Please Help i really need to do this but when i try to do what think is right it highlight's #include pleaase help me please i use Dev cpp
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This code is wonderful for a beginner like me. However, I have Static Text in my dialog, and it seems that the text will not show up when I use this code. Could anybody please help?
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try BringWindowToTop(); with the static text control.
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Hello
I am facing the same problem. Can you please help me that how can i solve this?
I tried BringWindowToTop() but it not worked.
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Simply needed to drop something in to handle a background image on a splash screen, and this worked perfectly. Thx.
David
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PS: I added a header block and fully referenced you - give credit where due!
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add a bitmap as a resource to your project:
Make a 256 color bitmap, save it in the 'res' folder of your project.
In vc++, add the file to your projects resource folder in vc++ (click on 'file view' in left frame, right click on resources folder, click add file)
Click on the 'Insert' menu (at the top of vc++), click 'resource', add your bitmap.
Click on 'ResourceView' in the left frame of vc++, you should see IDB_BITMAP1 in the 'bitmap' folder.
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Hi thanks for the code, while I'm trying to change the background inside my code I get a Debug Assertion fault while loading the new bitmap. If this error ignored on a release version after 30 changes of the bitmap the application ignores tottaly the command. I solved this problem by changing your implementation from static CBitmap to CBitmap* more specificaly:
BDialog.h
#if !defined(AFX_BDIALOG_H__A303185C_4254_4F5F_B5A8_462531A59B83__INCLUDED_)
#define AFX_BDIALOG_H__A303185C_4254_4F5F_B5A8_462531A59B83__INCLUDED_
#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
#define StyleTile 0
#define StyleCenter 1
#define StyleStretch 2
class CBDialog : public CDialog
{
// Construction
public:
int SetBitmap(UINT nIDResource);
void SetBitmapStyle(int style);
CBDialog(UINT nIDTemplate, CWnd* pParent = NULL); // standard constructor
// Dialog Data
//{{AFX_DATA(CBDialog)
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CBDialog)
protected:
//}}AFX_VIRTUAL
// Implementation
protected:
// Generated message map functions
//{{AFX_MSG(CBDialog)
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
private:
CBitmap* m_bitmap;
int m_style;
};
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_BDIALOG_H__A303185C_4254_4F5F_B5A8_462531A59B83__INCLUDED_)
BDialog.cpp
// BDialog.cpp : implementation file
//
#include "stdafx.h"
#include "BDialog.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CBDialog dialog
CBDialog::CBDialog(UINT nIDTemplate, CWnd* pParent /*=NULL*/)
: CDialog(nIDTemplate, pParent)
{
//{{AFX_DATA_INIT(CBDialog)
// NOTE: the ClassWizard will add member initialization here
m_style=StyleTile;
m_bitmap=new CBitmap();
//}}AFX_DATA_INIT
}
BEGIN_MESSAGE_MAP(CBDialog, CDialog)
//{{AFX_MSG_MAP(CBDialog)
ON_WM_ERASEBKGND()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CBDialog message handlers
BOOL CBDialog::OnEraseBkgnd(CDC* pDC)
{
CDialog::OnEraseBkgnd(pDC);
if(!m_bitmap->m_hObject)
return true;
CRect rect;
GetClientRect(&rect);
CDC dc;
dc.CreateCompatibleDC(pDC);
CBitmap* pOldBitmap = dc.SelectObject(m_bitmap);
int bmw, bmh ;
BITMAP bmap;
m_bitmap->GetBitmap(&bmap);
bmw = bmap.bmWidth;
bmh = bmap.bmHeight;
int xo=0, yo=0;
if(m_style == StyleTile)
{
for (yo = 0; yo < rect.Height(); yo += bmh)
{
for (xo = 0; xo < rect.Width(); xo += bmw)
{
pDC->BitBlt (xo, yo, rect.Width(),
rect.Height(), &dc,
0, 0, SRCCOPY);
}
}
}
if(m_style == StyleCenter)
{
if(bmw < rect.Width())
xo = (rect.Width() - bmw)/2;
else
xo=0;
if(bmh < rect.Height())
yo = (rect.Height()-bmh)/2;
else
yo=0;
pDC->BitBlt (xo, yo, rect.Width(),
rect.Height(), &dc,
0, 0, SRCCOPY);
}
if(m_style == StyleStretch)
{
pDC->StretchBlt(xo, yo, rect.Width(),
rect.Height(), &dc,
0, 0,bmw,bmh, SRCCOPY);
}
dc.SelectObject(pOldBitmap);
return true;
}
void CBDialog::SetBitmapStyle(int style)
{
if((style==StyleTile)||
(style==StyleCenter)||
(style==StyleStretch))
{
m_style = style;
}
}
int CBDialog::SetBitmap(UINT nIDResource)
{
delete m_bitmap;
m_bitmap=new CBitmap();
if(m_bitmap->LoadBitmap(nIDResource))
return 0;
else
return 1;//error
}
Enjoy and again thanks for your code
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When DPI is changed then the dialog size also changed...how could it possible to keep it size fix when DPI is changed..for examnple when i create a dialog in 96 dpi then its size will not increase in 120 dpi environment..thanks...Ashif
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I'm not using a bitmap as a background but I'm doing a FillSolidRect and rounded buttons have a white line around them where the button rect should be. Any clue on how I could fix it?
"It is better to remain silent and be thought a fool than to open one's mouth and remove all doubt." - Abraham Lincoln
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I wanted more than the 256 colors from a resource bitmap so I modified the code to load the bitmap from a file, including higher resolutions bitmaps (I've tested it w/ a 24-bit color bitmap).
Modifications are as follows:
CBDialog.h
1. Change CBitmap m_bitmap; to CBitmap *m_bitmap;
2. Change the int SetBitmap(UINT nIDResource); fucntion def to
int SetBitmap(const char *cszBitmapFile);
CBDialog.cpp
1. Throughout the whole file, change any reference of &m_bitmap or
m_bitmap. to m_bitmap or m_bitmap-> (correspondingly)
2. In the constructor, add m_bitmap = 0; somewhere
3. In OnEraseBkgnd(), change the line if(!m_bitmap.m_hObject) to
if(!m_bitmap || !m_bitmap->m_hObject)
4. Change the whole SetBitmap() function to:
int CBDialog::SetBitmap(const char *cszBitmapFile)
{
HBITMAP hBitmap = (HBITMAP)::LoadImage(NULL, cszBitmapFile, IMAGE_BITMAP,
0, 0, LR_LOADFROMFILE | LR_DEFAULTSIZE | LR_CREATEDIBSECTION);
if(!hBitmap)
return 1; // error; cszBitmapFile probably points to a non-existent file
m_bitmap = CBitmap::FromHandle(hBitmap);
if(m_bitmap)
return 0;
else
return 2;//error
}
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I have modify the code so that it can also implement the transparent background to the dialog ---- So you can watermark your company logo on the background.
Create the bitmap you want to display and also create the mask. (In the mask, whatever is white need to be converted to black and all other color needed to convert the black)
Modify BDialog.h
#define StyleTile 0
#define StyleCenter 1
#define StyleStretch 2
class CBDialog : public CDialog
{
// Construction
public:
int SetBitmap(UINT nIDResource,UINT nIDResourcemask=0);
void SetBitmapStyle(int style);
CBDialog(UINT nIDTemplate, CWnd* pParent = NULL); // standard constructor
// Dialog Data
//{{AFX_DATA(CBDialog)
// NOTE: the ClassWizard will add data members here
//}}AFX_DATA
// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CBDialog)
protected:
//}}AFX_VIRTUAL
// Implementation
protected:
// Generated message map functions
//{{AFX_MSG(CBDialog)
afx_msg BOOL OnEraseBkgnd(CDC* pDC);
//}}AFX_MSG
DECLARE_MESSAGE_MAP()
private:
CBitmap m_bitmap;
CBitmap m_bitmap_mask;
int m_style;
};
//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.
#endif // !defined(AFX_BDIALOG_H__A303185C_4254_4F5F_B5A8_462531A59B83__INCLUDED_)
Modify the BDialog.cpp
// BDialog.cpp : implementation file
//
#include "stdafx.h"
#include "BDialog.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CBDialog dialog
CBDialog::CBDialog(UINT nIDTemplate, CWnd* pParent /*=NULL*/)
: CDialog(nIDTemplate, pParent)
{
//{{AFX_DATA_INIT(CBDialog)
// NOTE: the ClassWizard will add member initialization here
m_style=StyleTile;
//}}AFX_DATA_INIT
}
BEGIN_MESSAGE_MAP(CBDialog, CDialog)
//{{AFX_MSG_MAP(CBDialog)
ON_WM_ERASEBKGND()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CBDialog message handlers
BOOL CBDialog::OnEraseBkgnd(CDC* pDC)
{
CDialog::OnEraseBkgnd(pDC);
if(!m_bitmap.m_hObject && !m_bitmap_mask.m_hObject)
return true;
if (!m_bitmap_mask.m_hObject){ //old way
CBitmap* pOldBitmap = NULL;
CRect rect;
CDC dc;
int bmw, bmh ;
BITMAP bmap;
int xo=0, yo=0;
GetClientRect(&rect);
dc.CreateCompatibleDC(pDC);
pOldBitmap = dc.SelectObject(&m_bitmap);
m_bitmap.GetBitmap(&bmap);
bmw = bmap.bmWidth;
bmh = bmap.bmHeight;
if(m_style == StyleTile){
for (yo = 0; yo < rect.Height(); yo += bmh){
for (xo = 0; xo < rect.Width(); xo += bmw){
pDC->BitBlt (xo, yo, rect.Width(),
rect.Height(), &dc,
0, 0, SRCCOPY);
}
}
}
if(m_style == StyleCenter){
if(bmw < rect.Width())
xo = (rect.Width() - bmw)/2;
else
xo=0;
if(bmh < rect.Height())
yo = (rect.Height()-bmh)/2;
else
yo=0;
pDC->BitBlt (xo, yo, rect.Width(),
rect.Height(), &dc,
0, 0, SRCCOPY);
}
if(m_style == StyleStretch){
pDC->StretchBlt(xo, yo, rect.Width(),
rect.Height(), &dc,
0, 0,bmw,bmh, SRCCOPY);
}
dc.SelectObject(pOldBitmap);
::DeleteObject(dc);
}
else {
// transparent background image
CRect rect;
int x0=0, y0=0;
int cx = 0, cy = 0;
GetClientRect(&rect);
int bmw, bmh ;
BITMAP bmap;
m_bitmap.GetBitmap(&bmap);
bmw = bmap.bmWidth;
bmh = bmap.bmHeight;
x0 =rect.left;
x0 =rect.top;
cx = rect.Width();
cy = rect.Height();
if(m_style == StyleCenter){
if(bmw < cx)
x0 = (cx - bmw)/2;
else
x0=0;
if(bmh < cy)
y0 = (cy-bmh)/2;
else
y0=0;
}
CDC dcBmp,dcMask;
dcBmp.CreateCompatibleDC(pDC);
dcBmp.SelectObject(&m_bitmap);
dcMask.CreateCompatibleDC(pDC);
dcMask.SelectObject(&m_bitmap_mask);
CDC hdcMem;
hdcMem.CreateCompatibleDC(pDC);
CBitmap hBitmap;
if(m_style == StyleCenter)
hBitmap.CreateCompatibleBitmap(pDC,bmw,bmh);
else if(m_style == StyleStretch || m_style == StyleTile)
hBitmap.CreateCompatibleBitmap(pDC,cx,cy);
else{
}
hdcMem.SelectObject(hBitmap);
hdcMem.BitBlt(0,0,bmw,bmh,pDC,0,0,SRCCOPY);
hdcMem.BitBlt(0,0,bmw,bmh,&dcBmp,0,0,SRCINVERT);
hdcMem.BitBlt(0,0,bmw,bmh,&dcMask,0,0,SRCAND);
hdcMem.BitBlt(0,0,bmw,bmh,&dcBmp,0,0,SRCINVERT);
if(m_style == StyleCenter)
pDC->BitBlt (x0,y0,bmw,bmh,&hdcMem,0,0,SRCCOPY);
else if(m_style == StyleStretch)
pDC->StretchBlt (0,0,cx,cy,&hdcMem,0,0,bmw,bmh,SRCCOPY);
else{
for (y0 = 0; y0 < rect.Height(); y0 += bmh){
for (x0 = 0; x0 < rect.Width(); x0 += bmw){
pDC->BitBlt (x0, y0, bmw, bmh, &hdcMem, 0, 0, SRCCOPY);
}
}
}
hdcMem.DeleteDC();
hBitmap.DeleteObject();
DeleteDC(dcMask);
DeleteDC(dcBmp);
}
return true;
}
void CBDialog::SetBitmapStyle(int style)
{
if((style==StyleTile)||
(style==StyleCenter)||
(style==StyleStretch))
{
m_style = style;
}
}
int CBDialog::SetBitmap(UINT nIDResource,UINT nIDResourcemask)
{
if(m_bitmap.LoadBitmap(nIDResource)){
if (nIDResourcemask > 0){
if(!m_bitmap_mask.LoadBitmap(nIDResource))
return 1;
}
return 0;
}
return 1;//error
}
Have fun!
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Hi Nishant,
Please forgive my "newbiness" if you will, but is there another way to make this so that you don't have to do the whole CDialog thing? The reason I ask is because there's another class that I'm already using that requires this.
Thanks in advance, 
Don
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It's the well-known CResizableDialog
class from Paolo Messina. If not that one, one similar, but they too require that you find and replace all instances of "CDialog" in the header and source file.
I'm building a skinnable Winamp sort of application and it seems like every class I find that would be useful, without having to re-invent any wheels that is, requires the same thing.
I guess there's a way to bundle up all of these classes into one source, and just make sure that there's no duplicate function names/variables, etc., and have them all derived from the same base? I'm sure it's possible, but I'm new to C++, not programming, just this language, which seems to be a little like going from Pig Latin to Japanese.
Having said that, any further details/advice that you can give me on this endeavor will be tremendously appreciated. 
Cheers,
Don
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Thank you very much!
<marquee behavior = "alternate">Hosam Aly Mahmoud</marquee>
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I want to strech/tile/center a bitmap across the background of my CEdit/CRichEdit ctrl (like a watermark)..can somebody help?
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How I change the bg color of a Static control (on the dlg) to the color of the bitmap ?
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erm this doesnt work in VC 6.0
and your "demo" executable wants MFc7.0 dll
Bryce
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bryce wrote:
and your "demo" executable wants MFc7.0 dll
Yes, it was built using VC++ .NET
bryce wrote:
erm this doesnt work in VC 6.0
The source files will work in either VC++ 6 or 7
The class source files I mean
But the sample project is a VC++ 7 project
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
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One thing that is almost always missing from these kinds of options (including that of the Windows Desktop) is the option to stretch with maintaining the aspect ratio. That would make a great additional feature.
Tim Lesher
http://www.lesher.ws
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Hear! Hear!
William
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Tim Lesher wrote:
the option to stretch with maintaining the aspect ratio
But then it won't fill up the area, will it? What do we do with the extra space?
Nish
Author of the romantic comedy
Summer Love and Some more Cricket [New Win]
Buy it, read it and admire me
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Easy. You center the bitmap and put a user selected colour in the additional space. And you provide an option for aspect ratio correctness so you lose some data rather than gain some space.
Christian
I am completely intolerant of stupidity. Stupidity is, of course, anything that doesn't conform to my way of thinking. - Jamie Hale - 29/05/2002
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Umm, yeah, what he said. Actually, I hadn't considered the option to crop instead of fill, but that sounds good, too.
Tim Lesher
http://www.lesher.ws
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Not to complain too much, but the thread about Old style solution takes up space without adding anything to the article. Shouldn't something like that be in The Lounge?
BTW, the article is nicely written. The subject is frequently asked about.
One last quibble: you could scale down the screenshots so they don't take so long to download on my dial-up connection. No DSL or T1 here. 
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Ed Gadziemski wrote:
the thread about Old style solution takes up space without adding anything to the article.
Heheh, ain't it cool though? A broken arc, showing at a glance that it is really two threads, neither having anything to do with the first two posts!
--------
A common man's understanding of science. Not a normal common man's of course. A very smart common man's. -- Nish, on Science Writing
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since the compression JPEG I thought it'd not matter much
The 3 pictures together total 80 KB. At 3 KB/s, that's almost half a minute to download. Of course, my download speed is about 5 KB/s here, so I get them in a mere 16 seconds (not counting the text and the advertisements and the CP headers and ...).
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Nish, I made lower-res, scaled versions of your screenshots. You can grab them from http://www.ravib.com/nish if you like.
/ravi
Let's put "civil" back into "civilization"
http://www.ravib.com
ravib@ravib.com
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I don't see why they'd be disallowed. My WebResourceProvider article uses GIFs because they're smaller.
/ravi
Let's put "civil" back into "civilization"
http://www.ravib.com
ravib@ravib.com
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I use Photoshop (an older version - 4.0) for all my image editing needs. I'd be happy to post slightly larger ones if you'd like. I can also sharpen them a tad, if you prefer.
/ravi
Let's put "civil" back into "civilization"
http://www.ravib.com
ravib@ravib.com
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Nish - Native CPian wrote:
Oh! I have Photoshop 6 here
<drool>
I just do Image..Size and scale the screen shot to 50% (or less, if you prefer) and then do Filter..Sharpen if necessary. Then, File..Export..Gif89a and you're all set!
/ravi
Let's put "civil" back into "civilization"
http://www.ravib.com
ravib@ravib.com
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Nish - Native CPian wrote:
We have a Multimedia team here and they have all these tools.
Ah! Reminds me of when I worked at Kodak. They begged the engineers to take preproduction digital cameras on their vacations!
Nish - Native CPian wrote:
For images with so many colors I always thought JPEG was better than GIF.
You're right, but screenshots have very few colors (usually much less than 256).
/ravi
Let's put "civil" back into "civilization"
http://www.ravib.com
ravib@ravib.com
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 General  News  Suggestion  Question  Bug  Answer  Joke  Rant  Admin
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A small CDialog derived class that helps avoid frequent copy/pasting of the same code, when using a bitmap as dialog background
| Type | Article |
| Licence | CPOL |
| First Posted | 6 Jun 2002 |
| Views | 326,926 |
| Bookmarked | 85 times |
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