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A dll is a dynamic library, a collection of functions and methods.
This library kann be linked to an executable (.exe).
Windows creates a process for each executable which is started.
A process just exists in memory of your OS.
A process has an Name and an ID (see task manager).
A process executes code which ca reside in a dll.
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I want to show bitmaps in icon form as previewings,just like the example thumbnail in cp,but I found that the item is just a section of the bitmap.
1.I import a bitmap to resource,modify its ID to IDB_BITMAP1.
2.I accociate a listctrl to m_listctrl.
3.I create: CImageList m_imagelist.
4.The last I do this in OnInitDialog():
//Load a bitmap
CBitmap bitmap;
bitmap.LoadBitmap(IDB_BITMAP1);
m_imagelist->Create(200,200,ILC_COLOR24,1,4);
m_imagelist->Add(&bitmap,RGB(255,0,0));
m_listctrl.SetImageList(m_imagelist,LVSIL_NORMAL);
m_listctrl.InsertItem(0,"1",0);
The result is the item in listctrl is just section of the bitmap,why?
Thanks~
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Chen-XuNuo wrote: just section of the bitmap
You can choose between 16*16 or 32*32 icons for a listctrl, I think. I suppose you r bitmap is shrinked to 32*32. (not sure, however).
Constantly "Saving the day" should be taken as a sign of organizational dysfunction rather than individual skill - Ryan Roberts[^]
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What do you mean~?And how can I do?
Besides,if I change the m_imagelist.Create to
m_imagelist.Create(300,300,...),it shows a bigger section of the bitmap~
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What is your bitmap size, then ? And how much is displayed ?
Constantly "Saving the day" should be taken as a sign of organizational dysfunction rather than individual skill - Ryan Roberts[^]
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Can you see a bitmap correct or no
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I can see it,but only a section of the bitmap.
If I set 200*200,and the program shows 200*200 of the bitmap,how can I change the bitmap size?
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If your bitmap is 500x500, but your image list is designed to hold images that are 200x200, you will only see the upper-left of the bitmap. That is expected behavior - the Imagelist control will not automatically scale images for you - you will have to do that yourself.
Also note that since you specified ILC_COLOR24 when creating the Imagelist control, setting a Mask value in the call to Add(...) will have no effect - Masks only work on 8-bit (or lower) bitmaps.
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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I don't know my bitmap's size,but it must larger than 200*200.
You said I should do it myself,but how can I do?To change the bitmap's size?
Besides,what is the purpose of the mask?
Thanks~
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You can use some software, like MSPaint, or the GIMP[^], to scale the images outside of the application. If you need to scale it internally, you can use GDI/GDI+ to draw the bitmap scaled directly into the appropriate area of the Imagelist control.
This is a bit tricky if you have a large number of images. Basically, you preallocate the space for the images in the Imagelist control using the ImageList_SetImageCount(...) macro, extract IMAGEINFO structures for each image "space" using the ImageList_GetImageInfo(...) macro, and then drawing the scaled-down image directly into the IMAGEINFO::hbmImage bitmap area.
Got all that? :P
Also, the "mask" is a color (or an area of the image) that is considered transparent when the image is drawn. In other words, the "mask" color (or area) is not drawn when the image is drawn onto the control.
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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Thanks~
But I am confused that I don't know how to resize the bitmaps before insert them to imagelist,is there any fuctions to do this?
And I have refer to the example http://www.codeproject.com/listctrl/thumbnail.asp?df=100&forumid=1951&fr=51[^] in cp.I found it do nothing to resize the bitmaps,but they are automaticly showed in thumbnails.Why`
James R. Twine wrote: extract IMAGEINFO structures for each image "space" using the ImageList_GetImageInfo(...) macro, and then drawing the scaled-down image directly into the IMAGEINFO::hbmImage bitmap area.
What is the purpose of this?I can only get the information in imagelist through this.And if I change the IMAGEINFO what I get from it ,nothing changed. 
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You need to look at the code for that project before asking... That project uses GDI+ code to generate the thumbnails and then adds the thumbnails to the imagelist control used by the listview control.
Bitmap img( A2W(strPath) );
Bitmap* pThumbnail = static_cast<Bitmap*>(<code>img.GetThumbnailImage(THUMBNAIL_WIDTH, THUMBNAIL_HEIGHT, NULL, NULL)</code>);
pThumbnail->GetHBITMAP(NULL, &hBmp);
pImage = new CBitmap();
pImage->Attach(hBmp);
m_ImageListThumb.Replace(i, pImage, NULL); The Bitmap::GetThumbnailImage(...) function scales the image for you returning a new one.
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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Oh~~~~~~~~~~~~I seldom do the GDI+ and I haven't use the "Bitmap" before.When I do this in my project:
HBITMAP hBitmap=LoadBitmap(AfxGetApp()->m_hInstance,MAKEINTRESOURCE(IDB_BITMAP1));
m_imagelist->Create(200,200,ILC_COLOR24|ILC_MASK,1,4);
Bitmap img(hBitmap);
Bitmap* pThumbnail = static_cast<Bitmap*>(img.GetThumbnailImage(200, 200, NULL, NULL));
pThumbnail->GetHBITMAP(NULL, &hBitmap);
CBitmap bitmap;
bitmap.Attach(hBitmap);
m_imagelist->SetImageCount(1);
m_imagelist->Replace(0,&bitmap,NULL);
m_listctrl.SetImageList(m_imagelist,LVSIL_NORMAL);
m_listctrl.InsertItem(0,"1",0);
There are errors:
D:\Code\I Do\ListControl2\ListControl2Dlg.cpp(143) : error C2065: 'Bitmap' : undeclared identifier
D:\Code\I Do\ListControl2\ListControl2Dlg.cpp(143) : error C2146: syntax error : missing ';' before identifier 'img'
D:\Code\I Do\ListControl2\ListControl2Dlg.cpp(143) : error C2065: 'img' : undeclared identifier
D:\Code\I Do\ListControl2\ListControl2Dlg.cpp(144) : error C2065: 'pThumbnail' : undeclared identifier
D:\Code\I Do\ListControl2\ListControl2Dlg.cpp(144) : error C2061: syntax error : identifier 'Bitmap'
pThumbnail->GetHBITMAP(NULL, &hBitmap);
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Maybe I should include the head file gdiplus.h`
Do you have it?Please send to my email~
Thanks~
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Mm..I have downloaded the gdiplus.h ~But many new errors occur~My god`
Basically the errors are about the file gdiplusinit.h~
For example:
c:\program files\microsoft visual studio\vc98\include\gdiplusinit.h(39) : error C2065: 'ULONG_PTR' : undeclared identifier
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You need to download the entire platform SDK (which may now be called the Windows SDK?), and then install and configure it.
Then you should be able to use GDI+.
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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I have installed it.And I find that GDI+ is a good thing.
Do you know how to use Bitmap( Class type, String resource )?
Because my bitmap is in the resource,but I don't know how to set the parameter "Class type"~
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You can use the thumbnail project mentioned earlier for examples on how to use some parts of GDI+.
The GDI+ documentation is going to be where you need to go now for more details on how to use it.
Good luck!
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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Thanks a lot for helping me so much~![Rose | [Rose]](https://codeproject.freetls.fastly.net/script/Forums/Images/rose.gif)
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James R. Twine wrote: Also note that since you specified ILC_COLOR24 when creating the Imagelist control, setting a Mask value in the call to Add(...) will have no effect - Masks only work on 8-bit (or lower) bitmaps.
It works fine on 24-bit bitmaps if you use the ILC_MASK flag...
m_imagelist->Create(200,200,ILC_COLOR24|ILC_MASK,1,4);
m_imagelist->Add(&bitmap,RGB(255,0,0));
Try it 
Mark
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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Actually, you need that parameter for masks to work correctly even in 8-bit images. For any images with a higher bit depth, I have had too much trouble trying to get mixed colors exactly right for that to work correctly for me. Couple that with art software that does dithering (with higher depth images) when not asked to and the problem gets real bad real quick.
Was easier to just build a mask bitmap and set it directly in the control.
Peace!
-=- James Please rate this message - let me know if I helped or not!<HR>If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Avoid driving a vehicle taller than you and remember that Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
See DeleteFXPFiles
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James R. Twine wrote: I have had too much trouble trying to get mixed colors exactly right for that to work correctly for me. Couple that with art software that does dithering (with higher depth images) when not asked to and the problem gets real bad real quick.
 That's when I'd hand the problem off to the art department (ie, my graphic-designer
girlfriend LOL).
There's 16777216 colors...how hard can it be to find ONE to use as a transparent color? 
Cheers!
"Posting a VB.NET question in the C++ forum will end in tears." Chris Maunder
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Hai,
Any one can Help me to provide the funtions for zooming in VC++?
I am using PRSDK (For canon Powershot A640 Camera).
Canon provide one sample. But in that sample they are provide only the
zooming option for CDSDK. which is not supported by Powershot A640.
So if any one have knowledge about this please help me.
If anyone have SDK which supports canon Powershot A640 Camera then i will
very thankfull for that.
Please replay to this mail
jonson.joseph@gmail.com.
Thanking you
Johnson
Johnson
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Hi there,
I have a CEdit Control which I have put on a form at design-time. The CEdit control does not have any text initially. Now on run-time, I am inserting text to the CEdit control and I want the CEdit Control size to fit the text that I entered. It has to fit EXACTLY the text (resizing the CEdit to have a width which will just be enough to show the text). How do I do this dynamically?
Any help would be highly appreciated
Best Regards,
Soleil Couchant
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As far as I know, you have to count the pixels used by your text through the font size, and then resize the CEdit text accordingly.
Constantly "Saving the day" should be taken as a sign of organizational dysfunction rather than individual skill - Ryan Roberts[^]
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