Re: GDI / GDI+ [modified] - C / C++ / MFC Discussion Boards

Re: GDI / GDI+

Mark Salsbery1-Jun-07 5:50

Mark Salsbery

1-Jun-07 5:50

Lamefif wrote:
Image* pBitmap = new Image(L"clockbg.bmp");
^ this does not

Maybe you need the full pathname of the file?

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Hamid_RT1-Jun-07 5:55

Hamid_RT

1-Jun-07 5:55

And where's clockbg.bmp(path of file)?

WhiteSky

Re: GDI / GDI+

Adno1-Jun-07 6:30

Adno

1-Jun-07 6:30

the image is in my project folder and i know it loads because i can display it like this:

Bitmap bitmap(L"clockbg.bmp");
graphics.DrawImage(&bitmap, 0, 0);

and it shows Confused | :confused:

thanks

Re: GDI / GDI+

Mark Salsbery1-Jun-07 6:48

Mark Salsbery

1-Jun-07 6:48

Bitmap is derived from Image.

If

Bitmap bitmap(L"clockbg.bmp");
graphics.DrawImage(&bitmap, 0, 0);

works, then

Image* pBitmap = new Image(L"clockbg.bmp");
graphics.DrawImage(pBitmap, 0, 0);

should work.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Adno1-Jun-07 7:06

Adno

1-Jun-07 7:06

i know Mark thats not my problem, but when i use GDI+ to load the image:
Image* pBitmap = new Image(L"clockbg.bmp"); or Bitmap.

as appose to:
HBITMAP pBitmap = LoadBitmap(GetModuleHandle(NULL), MAKEINTRESOURCE(IDB_BITMAP1));

and i use it for my:
UpdateLayeredWindow(hwnd, NULL, NULL, &sz, dcMem, &ptSrc, colour, &blend, LWA_ALPHA );

the window doesn't show, as i've posted in the code above
is the same image and i now it loads, i dont now..

thank you

Re: GDI / GDI+

Mark Salsbery1-Jun-07 7:25

Mark Salsbery

1-Jun-07 7:25

Sorry about that - I should have read the first post more closely Smile | :)

Maybe this will work better...

Image* pBitmap = new Image(L"clockbg.bmp");
 
HDC pDC = GetDC(hwnd);
HDC dcMem;
dcMem = CreateCompatibleDC(pDC);
COLORREF colour;
colour = RGB(255,255,255);
 
// Assuming white is the transparent color
<code>HBITMAP hBitmap;
pBitmap->GetHBITMAP(Color(0xFF,0xFF,0xFF), &hBitmap);</code>
 
SelectObject(dcMem, hBitmap);
...

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Adno1-Jun-07 7:48

Adno

1-Jun-07 7:48

Thanks Mark, but my aim is to use the transparency of the png and Alpha channel
to define the transparency, perpixelvlue as it were.

am goind all wrong about it?

thanks

Re: GDI / GDI+ [modified]

Mark Salsbery1-Jun-07 9:01

Mark Salsbery

1-Jun-07 9:01

I "think" you may be able to use a 32-bit ARGB DIBsection - I put together this test just to
make sure the alpha channel stuff was working.

(My "hdc" would be your "dcMem" and you wouldn't want to delete it or un-select your alpha bitmap
like I have if you pass it to UpdateLayeredWindow())

Image TransparentSrcBitmap(L"clockbg.bmp");
 
LONG lImageWidth = TransparentSrcBitmap.GetWidth();
LONG lImageHeight = TransparentSrcBitmap.GetHeight();
WORD wBitsPerPixel = 32;
 
//LONG lBytesPerRow = (((lImageWidth * (long)wBitsPerPixel + 31L) & (~31L)) / 8L);
LONG lBytesPerRow = lImageWidth * 4;
 
BITMAPINFO bmi;
memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = lImageWidth;
bmi.bmiHeader.biHeight = lImageHeight;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = wBitsPerPixel;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biSizeImage = lBytesPerRow * lImageHeight;
//bmi.bmiHeader.biXPelsPerMeter = 0;
//bmi.bmiHeader.biYPelsPerMeter = 0;
//bmi.bmiHeader.biClrUsed = 0;
//bmi.bmiHeader.biClrImportant = 0;
 
HDC hdc = ::CreateCompatibleDC(0);
 
BYTE* pBitmapBits;
HBITMAP hBitmap = ::CreateDIBSection(hdc, &bmi, DIB_RGB_COLORS, (void**)&pBitmapBits, NULL, 0);
 
if (hBitmap)
{   
   memset(pBitmapBits, 0, bmi.bmiHeader.biSizeImage);
 
   HGDIOBJ hOldBitmap = ::SelectObject(hdc, hBitmap);
 
   Graphics DstGraphics(hdc);
   DstGraphics.DrawImage(&TransparentSrcBitmap, 0, 0, TransparentSrcBitmap.GetWidth(), TransparentSrcBitmap.GetHeight());
 
   //** Test - blt the memory dc to the screen to make sure alpha channel data carried over
   BLENDFUNCTION bf;
   bf.BlendOp = AC_SRC_OVER;
   bf.BlendFlags = 0;
   bf.SourceConstantAlpha = 0x7F; // Alpha multiplier applied overall - use 0xFF - 0x7F is a test
   bf.AlphaFormat = AC_SRC_ALPHA;
 
   HDC hClientDC = ::GetDC(*this);
   ::AlphaBlend(hClientDC, 50, 50, TransparentSrcBitmap.GetWidth(), TransparentSrcBitmap.GetHeight(),
                hdc, 0, 0, TransparentSrcBitmap.GetWidth(), TransparentSrcBitmap.GetHeight(), bf);
   ::ReleaseDC(*this, hClientDC);
   //** End Test 
 
   ::SelectObject(hdc, hOldBitmap);<code> //<-- Don't do this when using with UpdateLayeredWindow()</code>
 
   ::DeleteObject(hBitmap);<code> //<-- Don't do this when using with UpdateLayeredWindow()</code>
}
 
::DeleteDC(hdc); <code>//<-- Don't do this when using with UpdateLayeredWindow()</code>

Sorry about all the strange extra variables - I cut and paste from assorted working code to throw
together a test - saves some typing. Smile | :)

-- modified at 15:30 Friday 1st June, 2007

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Adno1-Jun-07 10:39

Adno

1-Jun-07 10:39

thank you Mark very much for taking the time, it mean as lot me.
but is not quite there is coming out pixalated, the alpha value is being replace by a black colour.
program running image:
http://img118.imageshack.us/img118/8953/testwindowhu9.png
.
.
.

Code: the main method.
http://rafb.net/p/1Dfouz58.html

thank you so much .... Big Grin | :-D

Re: GDI / GDI+

Mark Salsbery1-Jun-07 10:48

Mark Salsbery

1-Jun-07 10:48

No problem!

Can you show your latest code?

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Mark Salsbery1-Jun-07 10:50

Mark Salsbery

1-Jun-07 10:50

~~What's "image" and what's "program window" in your screenshot?~~

Never mind I get it LOL

I'd still like to see your updated code if you can Smile | :)

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Adno1-Jun-07 10:52

Adno

1-Jun-07 10:52

Code: the main method.

http://rafb.net/p/1Dfouz58.html

^i posted here

Re: GDI / GDI+

Mark Salsbery1-Jun-07 11:06

Mark Salsbery

1-Jun-07 11:06

Try replacing

int t = UpdateLayeredWindow(hwnd, NULL, NULL, &sz, hdc, &ptSrc, NULL, &bf, ULW_COLORKEY );

with

int t = UpdateLayeredWindow(hwnd, NULL, NULL, &sz, hdc, &ptSrc, NULL, &bf, ULW_ALPHA );

You probably want to set bf.SourceConstantAlpha = 0xFF; (instead of 0x7F) too.

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Mark Salsbery1-Jun-07 11:10

Mark Salsbery

1-Jun-07 11:10

And comment out these lines - they were there for testing only (leave in the BLENDFUNCTION
since you're using that)...

// comment these out
HDC hClientDC = ::GetDC(hwnd);
::AlphaBlend(hClientDC, 50, 50, TransparentSrcBitmap.GetWidth(), TransparentSrcBitmap.GetHeight(),
hdc, 0, 0, TransparentSrcBitmap.GetWidth(), TransparentSrcBitmap.GetHeight(), bf);
::ReleaseDC(hwnd, hClientDC);

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Adno1-Jun-07 11:23

Adno

1-Jun-07 11:23

thanks a million

one more thing since i've got you here.
will i be able to draw on this window?
i.e:
Graphics graphics(GetDC(hwnd));
Bitmap bitmap(L"clockbg.bmp");
graphics.DrawImage(&bitmap, 100,100);

i did a quick test it dont seem to be working.

my goal would be to be as great as you one day lol

Re: GDI / GDI+

Mark Salsbery1-Jun-07 11:33

Mark Salsbery

1-Jun-07 11:33

Lamefif wrote:
will i be able to draw on this window?

Absolutely not!

Just kidding.

The DIBSection bitmap is already in a DC which is associated with a Graphics object (DstGraphics).
That's where you should draw. Example...

// redraw the image background
DstGraphics.DrawImage(&TransparentSrcBitmap, 0, 0, TransparentSrcBitmap.GetWidth(), TransparentSrcBitmap.GetHeight());
 
// draw some stuff on top of the background
Bitmap bitmap(L"clockbg.bmp");
DstGraphics.DrawImage(&bitmap, 100,100);

You have full access to the bitmap that IS your window. You can write directly to the pixel
bytes, use GDI+ to draw, use GDI to draw, or any combination of those Smile | :)

You may need to call UpdateLayeredWindow() again to see changes (i think the hdcSrc param can be
NULL for updates).

Mark

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

Re: GDI / GDI+

Adno1-Jun-07 11:55

Adno

1-Jun-07 11:55

Cheers Mark man

i new i could do it. :->

Re: GDI / GDI+

Mark Salsbery1-Jun-07 12:02

Mark Salsbery

1-Jun-07 12:02

"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder

How to get GUID

john56321-Jun-07 3:31

john5632

1-Jun-07 3:31

Hi Experts,

I want to create instance of a inteface(IPropertyBag) ,defind in a abc.dll file.
And same name interface exist in ocidl.h file.How can i pass a correct GUID
so that i can access method defind in abc.dll.

i try like this

IPropertyBag* Properties;
hr=CoCreateInstance(__uuidof(PropertyBag),NULL,CLSCTX_INPROC_SERVER,
__uuidof(IPropertyBag),(void**) &Properties);

Re: How to get GUID

Roger Stoltz1-Jun-07 4:13

Roger Stoltz

1-Jun-07 4:13

pther wrote:
I want to create instance of a inteface(IPropertyBag) ,defind in a abc.dll file.

You don't "create" interfaces.
You create a component and ask for one, or several, of its interfaces.

When you create a component you have to specify which component you want to create and which interface you want to access in that component.
This is what the arguments to ::CoCreateInstance() is for.
The first parameter should be the CLSID of the component you want to create, have a look here[^].

"It's supposed to be hard, otherwise anybody could do it!" - selfquote
"High speed never compensates for wrong direction!" - unknown

Re: How to get GUID

CPallini1-Jun-07 5:44

CPallini

1-Jun-07 5:44

You can use the Visual Studio Ole View tool to see the CLSID of the object.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Re: How to get GUID

john56321-Jun-07 21:15

john5632

1-Jun-07 21:15

I saw the CLSID by ole Tool as u suggested.And i try to put the CLSID directly in CoCreateInstance().
Like:
hr=::CoCreateInstance(uuid(47000673-7DB2-44C9-8AC1-65266117D280),NULL,CLSCTX_INPROC_SERVER,
__uuidof(IPropertyBag),(void**) &Properties);

But it dispaly syntext error.

error C2059: syntax error : ')'
error C2059: syntax error : 'bad suffix on number'
error C2059: syntax error : 'bad suffix on number'
error C2059: syntax error : 'bad suffix on number'

How can i make it correct

Re: How to get GUID

CPallini3-Jun-07 2:55

CPallini

3-Jun-07 2:55

pther wrote:
hr=::CoCreateInstance(uuid(47000673-7DB2-44C9-8AC1-65266117D280),NULL,CLSCTX_INPROC_SERVER,
__uuidof(IPropertyBag),(void**) &Properties);

You cannot use the CLSID string (47000673-7DB2-44C9-8AC1-65266117D280) that way, you have EITHER TO:

(1) Properly initialize the GUID struct members (The following example deals with MsComm control, asking for IUnknown interface):

GUID guid;
IUnknowun *pUnk;
// {648A5600-2C6E-101B-82B6-000000000014}
guid.Data1 = 0x648A5600;
guid.Data2 = 0x2C6E;
guid.Data3 = 0x101B;
guid.Data4[0] = 0x82;
guid.Data4[1] = 0xB6;
guid.Data4[2] = guid.Data4[3] = guid.Data4[4] = guid.Data4[5] =   guid.Data4[6] = 0x00;
guid.Data4[7] = 0x14;
hr = CoCreateInstance( guid, NULL, CLSCTX_INPROC_SERVER, IID_IUnknown, (void **) &pUnk);

OR
(2) Use the UuidFromString to perform the task, i.e.

GUID guid;
IUnknown * pUnk;
RPC_STATUS Status = UuidFromString((unsigned char *)"648A5600-2C6E-101B-82B6-000000000014", &guid);
hr = CoCreateInstance( guid, NULL, CLSCTX_INPROC_SERVER, IID_IUnknown, (void **) &pUnk);

Please note that point (2) requires the rpc.h header in your source file and to link your project with rpcrt4.lib library.

Hope that helps.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

Copy constructor

Karismatic1-Jun-07 1:39

Karismatic

1-Jun-07 1:39

Why does we pass a const reference object parameter in copy constructor?

Re: Copy constructor

Maximilien1-Jun-07 1:44

Maximilien

1-Jun-07 1:44

why not ? maybe because we don't want to modify the original object ?

Maximilien Lincourt
Your Head A Splode - Strong Bad

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