C / C++ / MFC

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Create a bitmap and save it in a file (.bmp) jybe6-Jan-02 21:31 jybe 6-Jan-02 21:31  I draw a graphique in an Active x based on MFC! This drawing, I Do it in a class based on CWND. I can't manage do créat a bitmap and save it in a file (.bmp) if someone have an exemple or something I realy need help!!!! jybe the frenchy Re: Create a bitmap and save it in a file (.bmp) Rickard Andersson206-Jan-02 23:23 Rickard Andersson20 6-Jan-02 23:23  Check out many examples here on CodeProject.com! ------------------------------ ©0d3 ©®4©k3® - That's me! ------------------------------ Creating a window ! simple problem provided you know the right track Abhishek Narula6-Jan-02 19:43 Abhishek Narula 6-Jan-02 19:43  Hi Everybody ! I want a discuss the problem that I am facing here it goes .. I have to display a window in the air , it should ideally be a Dialog box becoz this window would be containign many controls . BUT ! this window should not have the tile bar nor the borders nothing !! till here its easy .. the problem is after that .. Problem is I dont want the parent window to loose the control .. that is title bar of the parent window should never become inactive when our window is created and our window should be able to react to messages .. like mouse click , mouse move .. See are you able to understand the problem ?? Please add your valuable comments. Abhishek Narula "Learn to appreciate others ... World would appreciate you" Re: Creating a window ! simple problem provided you know the right track Nish Nishant6-Jan-02 20:21 Nish Nishant 6-Jan-02 20:21  What you seem to looking for is a modeless dialog. Read this article to get an idea about creating modeless dialogs. It was written by one of the nicest people I know of. Just kidding. But I do hope the article helps you with regard to what you are looking for. http://www.codeproject.com/useritems/gettingmodeless.asp Regards Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Re: Creating a window ! simple problem provided you know the right track Abhishek Narula6-Jan-02 21:11 Abhishek Narula 6-Jan-02 21:11  Thanks for replying .. but this is not what I am looking for .. Moment you click on your modeless dialog, the parent window gets inactive ..and this is waht I dont want ! I hope you have understood it now . Let me know if you know about some more articles .. Abhishek Narula "Learn to appreciate others ... World would appreciate you" Re: Creating a window ! simple problem provided you know the right track Nish Nishant6-Jan-02 23:00 Nish Nishant 6-Jan-02 23:00  Abhishek Narula wrote: Moment you click on your modeless dialog, the parent window gets inactive That's default windows behaviour. The currently active window will also be shown as active. And only one window, whether modal or modeless, will be active at a time. Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Pointers 6-Jan-02 18:48 6-Jan-02 18:48  I have a structure declared in CDocument class it's my own stucture and contains strings and ints I then have another structure which contains a pointer to the first structure the second structure is passed to a thread how do i manipulate the first structure using the pointer passed to the thread (hence inside the thread) these are the structures typedef struct tagTAKEGO ///Structure 1 { CString word; int square; int direction; } TAKEGO; typedef struct tagTHREADPARMS /// thread parameter function { HWND hWnd; TAKEGO* tkGO; } THREADPARMS; void CDocument:: function // function that runs the thread { THREADPARMS* thr= new THREADPARMS; thr->hWnd=hWnd; // hwnd is a HWND declared in CDocument thr->tkGO=&take; // take is a TAKEGO declared in CDocument defined above CWinThread* PosVThread=AfxBeginThread (thread,thr); } UINT thread (LPVOID Param) // the thread that will not change values in CDocument { THREADPARMS* ptp= (THREADPARMS*)Param; (*(ptp->tkGO)).direction=HORIZONTAL; // already defined, these lines are defective (*(ptp->tkGO)).square=100; (*(ptp->tkGO)).word="A word"; } I hope you might be able to help! Cheers - Jason Is it because the object/new structure is being destroyed as soon as the function in CDocument is ended? I thought the new statement allocated space in a runtime class's stack and didnt' destroy until release was called. (Thats a slimmed down version of the real thing which half of it does work) Re: Pointers Nish Nishant6-Jan-02 18:57 Nish Nishant 6-Jan-02 18:57  (*(ptp->tkGO)).direction=HORIZONTAL will fail as tkGO is a pointer which you need to de-reference. Try this : ptp->tkGO->direction=HORIZONTAL Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Re: Pointers 6-Jan-02 19:19 6-Jan-02 19:19  no that doesn't work either way they both compile, but neither method changes the structure in the my document class Re: Pointers 6-Jan-02 19:21 6-Jan-02 19:21  no that doesn't work either way they both compile, but neither method changes the structure in the my document class. I may have to rethink things, just off the top of my head could it be (*(ptp->tkGO->direction)).direction? I'll just try that way and get back, thanx for your help, get back to you soon Re: Pointers Nish Nishant6-Jan-02 20:38 Nish Nishant 6-Jan-02 20:38  Take a look at this line :- thr->tkGO=&take; // take is a TAKEGO declared in CDocument defined above Where have you declared take? Is it a temporary stack variable that goes out of scope? Nish Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut re. Out of scope 7-Jan-02 2:54 7-Jan-02 2:54  it's declared in the class & no it shouldn't have gone out of scope. what's the usage of SetBkColor? AnonymousBabe@usa.net6-Jan-02 17:29 AnonymousBabe@usa.net 6-Jan-02 17:29  indeed when i want to change the color of the background ,i must call the FillRect like method, is there another method will fulfill it with SetBkColor? thanks one is the other who absorbs the thoughts of others Re: what's the usage of SetBkColor? Lim Bio Liong6-Jan-02 17:52 Lim Bio Liong 6-Jan-02 17:52  Hello ooze, SetBkColor() is generally used in GDI operations where the use of a Pen is involved (e.g. TextOut(), DrawText(), etc). If you want to programmatically control the background color of a window, set the "hbrBackground" member of your window's WNDCLASS structure to NULL, and then process the window's WM_ERASEBKGND message. See the Win32 API documentation on WM_ERASEBKGND for more details. However, to actually perform the coloring operation, you'll still have to use functions like FillRect() etc. Hope the above info will be helpful to you, ooze. Regards, Bio. Re: what's the usage of SetBkColor? AnonymousBabe@usa.net6-Jan-02 18:07 AnonymousBabe@usa.net 6-Jan-02 18:07  need to set the hbrBackGround memeber of WNDCLASS to null? of coz , we hope the color display on the background actually. so it seems the API isn' t really useful when not using CreatePen. one is the other who absorbs the thoughts of others what's the use of these functions? leezy_20006-Jan-02 14:45 leezy_2000 6-Jan-02 14:45  GDI.DMBITBLT GDI.DMCOLORINFO GDI.DMENUMDFONTS GDI.DMENUMOBJ GDI.DMOUTPUT GDI.DMPIXEL GDI.DMREALIZEOBJECT GDI.DMSCANLR GDI.DMSTRBLT GDI.ENGINEDELETEFONT GDI.ENGINEENUMERATEFONT GDI.ENGINEEXTTEXTOUT GDI.ENGINEGETCHARWIDTH GDI.ENGINEGETGLYPHBMP GDI.ENGINEREALIZEFONT GDI.ENGINESETFONTCONTEXT Re: what's the use of these functions? Christian Graus6-Jan-02 15:01 Christian Graus 6-Jan-02 15:01  Where did you find them ? Visual Assist and Visual C++ do not recognise them. Christian I have come to clean zee pooollll. - Michael Martin Dec 30, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now Bizarre Round Error AJ1236-Jan-02 11:50 AJ123 6-Jan-02 11:50  I run the following code fragment to produce some graphics. The problem is it produces different results at different times. Could this be a rounding error? And how can i fix ot for (int col=0; col Re: Bizarre Round Error AJ1236-Jan-02 11:54 AJ123 6-Jan-02 11:54  Code Fragement: for (int col=0; col Re: Bizarre Round Error Christian Graus6-Jan-02 13:13 Christian Graus 6-Jan-02 13:13  I presume you have a > as well as the <, which is causing your for loop to disappear. Use & and lt or gt to put a < or > if they are paired like an HTML tag. What are you doing with iXVal ? You're using all whole numbers, so there's not going to be any rounding errors. Christian I have come to clean zee pooollll. - Michael Martin Dec 30, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now Re: Bizarre Round Error Daniel Turini6-Jan-02 14:04 Daniel Turini 6-Jan-02 14:04  I'm not sure about evaluation order in C++, but probably, the expression: x + (a * b / c) will be evaluated as: x + (a * (b / c)) if a, b and c are big enough, or multiple, or floating point, no problem, but in your case, if m_cols > 1, in the first loop pass, (col+1)/m_cols will evaluate as int(1/2). That's 0. So, iXVal == m_rectLocation.left, what's wrong. If you do this: int iXVal = m_rectLocation.left + (m_rectLocation.Width() * (col+1)) / m_cols; That rewrite will force m_rectLocation.Width() * (col+1) to be evaluated before the division. There still will be rounding, but MUCH less problematic. Crivo Automated Credit Assessment Re: Bizarre Round Error Christian Graus6-Jan-02 15:07 Christian Graus 6-Jan-02 15:07  Damn - I did not spot the divide. But I think divide and multiply have the same order of operation and evaluate left to right. Christian I have come to clean zee pooollll. - Michael Martin Dec 30, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now Re: Bizarre Round Error Tim Smith6-Jan-02 16:57 Tim Smith 6-Jan-02 16:57  Yes, they do. Multiplication and divide evaluate left to right. (a * (b / c)) != (a * b / c) Tim Smith Descartes Systems Sciences, Inc. MFC File I/O? 6-Jan-02 10:28 6-Jan-02 10:28  How do i read and write to files in MFC? thanks Re: MFC File I/O? Giles6-Jan-02 11:45 Giles 6-Jan-02 11:45  If your using MFC with the Doc\View architecture then check out the CArchive class used in the Serialize function in the CDocument derived class for which the wizard should generrate some code that looks like: void CMyDoc::Serialize(CArchive& ar) { if (ar.IsStoring()) { // TODO: add storing code here } else { // TODO: add loading code here } } Hope this helps. Check out CArchive on MSDN here. Giles

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