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Istream & Global Alloc & GDI+! AJ12328-Mar-02 10:11 AJ123 28-Mar-02 10:11  Hi, I have been loading images from memory directly into GDI+ Bitmap Objects. This involved creating a stream. Somebody recommended that I used CreateStreamOnHGlobal, which works great. Now I am looking at doing the reverse, saving JPEG data represented by the Bitmap object into memory again through a stream and createstreamonhglobal. My question is how do i know how big I have to make the global alloc, do i just have to make sure it's sufficient or is there anyway of determining the size or making the size of the stream dynamic. Hope this is clear, any advice or comments would be grately appreciated. Thanks Again Rich Re: Istream & Global Alloc & GDI+! Paul M Watt28-Mar-02 11:08 Paul M Watt 28-Mar-02 11:08  You do not have to worry about the size of the stream, it will automatically resize itself as space is needed. There is no real way to determine how large a JPEG will be until you compress it as if you were going to save it to a file. So allocate a small memory buffer with CreateStreamOnHGLOBAL and then pass the stream object to Save in the bitmap, the memory will be taken care of for you. If you do find a way to determine how mush space your image will take, you can use the SetSize method to reallocate memory in your stream. Problem using DIalogBar Maverick28-Mar-02 8:43 Maverick 28-Mar-02 8:43  When I'm using a DialogBar, with controls on it (particulartly Frames, and Buttons)..... do standard procdedures using a dialogBar in a Doc/View application, make a dialogresource, set an ID for the dialog bar, ID's for the controls...etc... When I implement the code for the button in a dialogbar it works fine.. but when i implement code for a frame control(the message map in CLASSWIZARD is only BN_CLICKED), when i click on the frame when i run the program, it doesn't get executed... How come when iclick on the button control in the dialogbar something gets executed, but when i click on the frame control, nothing gets executed?? is this a bug in Visual C?? Re: Problem using DIalogBar Shog928-Mar-02 8:55 Shog9 28-Mar-02 8:55  AFAIK, buttons send messages to their parent window, not their owner. (when a dialog bar is not docked, it's parent is no longer the frame window; instead it is a child of a mini-frame created to float it) You'll have derive a class CDialogBar and put the code to handle the button press in that. Then you can forward it on to your frame window if necessary. And if words were wisdom, I'd be talking even more. The Offspring, I Choose Re: Problem using DIalogBar Maverick28-Mar-02 14:48 Maverick 28-Mar-02 14:48  Actually the messges of my buttons in my Dialog Bars works fine...even if the dialog bar is docked or floating but the messges of the Frame Controls in the Dialog Bar doesn't.... How do I forward messages to my FrameWIndow?? Re: Problem using DIalogBar Shog928-Mar-02 14:57 Shog9 28-Mar-02 14:57  Sorry, i'm misunderstanding you. Do you mean the controls on the frame, like the close or maximize buttons, or do you mean a STATIC control drawing an etched frame w/ in the dialog bar? And if words were wisdom, I'd be talking even more. The Offspring, I Choose Re: Problem using DIalogBar Maverick28-Mar-02 19:11 Maverick 28-Mar-02 19:11  I mean the Static Control drawing an etched frame within the dialog bar.... when you make a dialog resource, VS has toolbars that lets you draw any kinds of controls in the dialog resource.... The toolbar button that says picture control.... Re: Problem using DIalogBar Shog928-Mar-02 19:25 Shog9 28-Mar-02 19:25  Ok, i understand now. These controls are usually not used for input, so i was confused. Anyway, make sure that SS_NOTIFY is set; you'll then get messages when the user clicks or double-clicks on the control. Not too much else you can do with a frame, really. Sometimes I only remember, The days when i was young Nowadays no one remembers when they were young and stupid... ADEMA, The Way You Like It Re: Problem using DIalogBar Maverick28-Mar-02 20:20 Maverick 28-Mar-02 20:20  OK... how do I use SS_NOTIFY??... i just encountered SS_NOTIFY?? sorry, i'm a bit new VC.... I'm using it for output and Feedback...... so i need to draw to the frame control manually through code.... Re: Problem using DIalogBar Shog928-Mar-02 20:40 Shog9 28-Mar-02 20:40  In the dialog editor, bring up properties for the frame. On one of the pages (i forget which) there is a "notify" option. Sometimes I only remember, The days when i was young Nowadays no one remembers when they were young and stupid... ADEMA, The Way You Like It Re: Problem using DIalogBar Maverick29-Mar-02 5:38 Maverick 29-Mar-02 5:38  Thats it!! THanks a lot... I got it to work already... thanks very much... "Its all right. the gun isn't loaded." Re: Problem using DIalogBar Maverick28-Mar-02 15:01 Maverick 28-Mar-02 15:01  For your information, I made a DialogBar resource template... set the DialogBar's ID, the the button control's ID, and the frame control's ID, after that I go to ClassWizard, and asks me if i want to make a new class or select from an existing class.... I chose cancel and go thruh classwizard anyway.... i don't make a new class... I get my messages thru the ID's..... Re: Problem using DIalogBar David Carkeet28-Mar-02 16:00 David Carkeet 28-Mar-02 16:00  If you look in CodeGuru (sorry..) you'll find a dicussion of a "CInitDialogBar" class which solves just this sort of problem... Cheers, Dave Carkeet. How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Bart-Man28-Mar-02 8:33 Bart-Man 28-Mar-02 8:33  Greetings, I was wondering if anyone knows how I can STREAM an image (.jpg, gif, ect) into an html page, or even Use Media Player? Is it possible to stream an image into media player on a web page? Thanks in advance Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Philip Patrick28-Mar-02 10:43 Philip Patrick 28-Mar-02 10:43  What you mean to "stream" image? Where you want to stream it from? If I understand you right, you want to catch the browser request and stream the image data from memory, right? Is so, you need to catch the http protocol request, check for the file name and if it yours, load the image to memory and return to browser. This thingy called Asynchonous Pluggable Protocol. You can read about it here If not, skip my reply Philip Patrick Web-site: www.saintopatrick.com "Two beer or not two beer?" Shakesbeer Need ASP hosting? Check out 123HostNow.com Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Bart-Man28-Mar-02 12:55 Bart-Man 28-Mar-02 12:55  Yup, you read what I was hoping to do correctly... Thanks for the link!!! Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Philip Patrick28-Mar-02 13:08 Philip Patrick 28-Mar-02 13:08  Ah, I got it right BTW, I'm writing an article about that, lmao, when I'll get a time to make a demo application, I'll post it Philip Patrick Web-site: www.saintopatrick.com "Two beer or not two beer?" Shakesbeer Need ASP hosting? Check out 123HostNow.com Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Bart-Man1-Apr-02 11:17 Bart-Man 1-Apr-02 11:17  An article would be great! Since I am still having trouble getting it to work! Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Philip Patrick1-Apr-02 11:46 Philip Patrick 1-Apr-02 11:46  Mmmm... not sure I will make it soon. Have no time If you want I can send you my abandoned project which utilizes this feature. It was so-called WinHTML. It allows you to "build" HTML pages along with graphics, stylesheets, whatever inside single executable, which you can run and you will get HTML interface It was really nice project, but client cancelled it Oh and you will need BCGControlBar in order to compile it Philip Patrick Web-site: www.saintopatrick.com "Two beer or not two beer?" Shakesbeer Need Web-based database administrator? You already have it! Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Bart-Man2-Apr-02 3:28 Bart-Man 2-Apr-02 3:28  Yeah, if isn't too much trouble I could use the code to reference. Thanks, again for your help, too bad I couldn't email yah a beer for your trouble! Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Philip Patrick2-Apr-02 3:49 Philip Patrick 2-Apr-02 3:49  Ok, here you go. The workspace cotains 2 project. The one you are interesing in called "standard" and the class is CWHEProtocol. It is the class that pushes (streams) all image data into browser. The second project is actually the project itself, it doesn't do nothing with protocols, but maybe you will need something from it. Also you have to build them both if you want the first to work And the second zip file is a compiled demo, with BCGControl dll included. You may need it if you can't compile by yourself (don't have BCG for example). Source files - 180k Compiled demo - 450k Philip Patrick Web-site: www.saintopatrick.com "Two beer or not two beer?" Shakesbeer Need Web-based database administrator? You already have it! Re: How can I stream an image (.jpg, gif, ect) into an html page, or even Use Media Player? Bart-Man2-Apr-02 4:20 Bart-Man 2-Apr-02 4:20  Thanks for the project and source code! I like your editor design that you did in the project, easy to use! Scrolling in an OpenGL window Abubakar Pasha28-Mar-02 8:32 Abubakar Pasha 28-Mar-02 8:32  I have used CScrollView as my view class and have used CScrollView::SetScrollSizes() to set the scrolling sizes. When i scroll the OpenGL viewport does not move with the scroll bars and when the viewport limit ends the white background comes instead of the black background that I have used in OpenGL. I have used gluOrtho2D(0.0, 639.0, 0.0, 479.0) in the CScrollView::OnSize() to set the orthognal projection and used SetScrollSizes(MM_TEXT, CSize(1024,1024)) in CScrollView::OnInitialUpdate(). How can i change the viewport or projection with respect to the scroll bars so that in a particular scrolling area the background remains black (as set for OpenGL drawings) and the images are scrolled perfectly. Equivalent of Java applet 28-Mar-02 7:40 28-Mar-02 7:40  Java applet is a program that can be embedded in a web page. Suppose there is an applet which plots graphs of various algebraic equations. How can we achieve the same thing using .NET??? I mean what is the equivalent of Java applet in .NET world. How can we create a program using VC++.NET that plots algebraic expression, on a web-page. I know one equivalent, and that is ActiveX control. But i am asking that what is the alternative of such applets in .NET world. Farkhanda Re: Equivalent of Java applet Tomasz Sowinski28-Mar-02 10:36 Tomasz Sowinski 28-Mar-02 10:36  Check this article: http://msdn.microsoft.com/msdnmag/issues/02/01/UserCtrl/UserCtrl.asp Anyway, you can move the plotting to server side - server would just dynamically create an image file and send it to client. Tomasz Sowinski -- http://www.shooltz.com - It's for protection - Protection from what? Zee Germans?

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