C / C++ / MFC

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Re: Pb with updating my desktop Ravi Bhavnani25-Dec-01 6:19 Ravi Bhavnani 25-Dec-01 6:19  UpdateWindow() will repaint the parts of a window that are marked invalid (i.e. in need of repainting). You should first call Invalidate() to invalidate the desktop. There's no need to call UpdateWindow(), since Windows will eventually send a WM_PAINT message to the desktop. However, if you want to force an immediate repaint, then call UpdateWindow() right after you call Invalidate(). /ravi "There is always one more bug..." http://www.ravib.com ravib@ravib.com Tapi - (1 server n-clients) Sandeep Shetty23-Dec-01 21:04 Sandeep Shetty 23-Dec-01 21:04  Hello! I want to establish data sessions between 1 server and n-clients. The data communication would be progressing between 1 server and n-clients simultaneously. i.e.one server and many clients.i.e. N client machines would be connecting and communicating with 1 server machine. Once the connection is established, server would be accepting the data sent by the clients and then the same data would be again sent back to the same client who sent it to the server, through modem. The application should have the capability to do data transmission and receive simulnateously with n-clients. The application is supposed to run on Win 98,WinNT, WIN 2000 and Win XP. I am using C programming and TAPI 2.0. I do not want to use COM/DCOM. Can you please tell me if it is possible to build an application of n-clients and 1 server using language C, TAPI 2.0 and without COM/DCOM. I already have built an application for data communication between single client and single server. Data transmission is done through the COM port to which the modem is connected. While programming for 1-server 1 client I have made use of async comm by using CreateEvent(), ReadFile(), WriteFile() (for communciation between COM ports), WaitforSingleObject() and GetOverlappedResult(). The configuration I am using is : There is a modem connected to the server machine and there are n (say 4) client machines. Each client has a modem connected to it. The data communication is via the modem through the COM port to send and recieve data (data communication--> client to server back to client). If suppose, the server is waiting for connection and a client connects to the server, the connection is established and the data communication is started. Now another client attempts to connect to the server, will that client be able to connect to server ?? (as the first client is still holding the line and busy in data communication). Do I have to have some other specialised hardware so that other clients may also connect to server simultaneously. (same as in EPBX systems). or do I need to have some software which will help me connect n-clients to 1 server. Could you please guide me amd give some idea about how to go about solving this problem. Your advise would be of great help to me. Thanking you. With Regards, Sandeep Shetty Random points in a polygon Paul Selormey23-Dec-01 20:17 Paul Selormey 23-Dec-01 20:17  Hello All, Anyone with a nice algorithm to randomly generate points in a polygon? Random points based on the bounding boxes are not working nicely. Any help or tip? Best regards, Paul. Paul Selormey, Bsc (Elect Eng), MSc (Mobile Communication) is currently Windows open source developer in Japan, and open for programming contract anywhere! Re: Random points in a polygon Christian Graus25-Dec-01 11:13 Christian Graus 25-Dec-01 11:13  You mean you want to generate random points which are within the polygon ? Christian After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now Re: Random points in a polygon Paul Selormey25-Dec-01 13:44 Paul Selormey 25-Dec-01 13:44  Yes. I have the coordinates of the polygon and I need to be able to randomly select a given number of points from within the polygon. The aim is to draw dots in the polygon randomly, something to show low and high density polygons. Best regards, Paul. Paul Selormey, Bsc (Elect Eng), MSc (Mobile Communication) is currently Windows open source developer in Japan, and open for programming contract anywhere! Re: Random points in a polygon Christian Graus26-Dec-01 12:41 Christian Graus 26-Dec-01 12:41  Two ways you could do this: 1. Generate a mask bitmap. Make it black and draw a filled polygon in white. Then for each point you generate, check if that pixel in the mask is white 2. To find out if a point is inside the polygon, use the ratio of x2-x1/y2-y1 to find out the slope of each line. Then use that ratio to figure out if that point is inside that line, or not. Christian After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now Re: Random points in a polygon Paul Selormey26-Dec-01 13:49 Paul Selormey 26-Dec-01 13:49  Hello Christian, Thanks for the suggestions. Currently, I am doing this 1. Get the bounding box of the polygon and use it to generate the random points. 2. Create a region CRgn out of the polygon and test if the point lies in the region PtInRegion, if not generate another till I get the required number of points. The application, however, requires a lot of speed and it deals with many polygons. I will try your suggestions too to see which is faster and less memory consuming. Best regards, Paul. Paul Selormey, Bsc (Elect Eng), MSc (Mobile Communication) is currently Windows open source developer in Japan, and open for programming contract anywhere! Re: Random points in a polygon Tim Smith26-Dec-01 14:10 Tim Smith 26-Dec-01 14:10  Look at this link. Point inside a polygon is BIG deal to 3d/2d game programmers. Point Inside Polygon Tim Smith Descartes Systems Sciences, Inc. Re: Random points in a polygon Paul Selormey26-Dec-01 14:44 Paul Selormey 26-Dec-01 14:44  Thanks, it is yet another step closer to the goal. Best regards, Paul. Paul Selormey, Bsc (Elect Eng), MSc (Mobile Communication) is currently Windows open source developer in Japan, and open for programming contract anywhere! Re: Random points in a polygon Christian Graus26-Dec-01 14:15 Christian Graus 26-Dec-01 14:15  I suspect the mask will be fastest. If you make the mask a DIBSection it will be fastest of all, you'll have access to the underlying bits without having to call GetPixel in a DC. Christian After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now SaveDialog San23-Dec-01 19:09 San 23-Dec-01 19:09  hello All, I want to show the SaveDialog box in a button click .How is it possible?? SSN Re: SaveDialog Michael Dunn23-Dec-01 19:45 Michael Dunn 23-Dec-01 19:45  Check out GetSaveFileName() --Mike-- My really out-of-date homepage "Why does anyone have a web page? Too much free time... not enough friends... justifying owning a computer." -- Noel Crane on Felicity Sonork - 100.10414 AcidHelm Big fan of Alyson Hannigan. c,c++ borland 23-Dec-01 16:35 23-Dec-01 16:35  i need to develop a code which takes in a image .tiff file and reads the certain contains of the imagage and stores them in the .csv format file....can any one help me in how to achieve this.Actually this image is a bank cheque that is scanned and stored as .tiff file and need to read the amount, payable to and cheque number from the cheque image can anu help me out regarding this i will be much thankful to u all waiting for reply thanks in advance BSR About Shell Path 23-Dec-01 15:19 23-Dec-01 15:19  How to get the path of the shell (Explorer)? For example: I open my C:\ using Explorer, i want get the from the Explorer Windows Handle... About Hook, Could you help me? 23-Dec-01 14:18 23-Dec-01 14:18  I use a WndProc hook in my system... use this WndProc hook, i have painted a button in the caption of every program. when press this button, i want it pop up a menu( the owenr draw menu), i failed. It is just effective in Explorer program, not effective in Visual Studio program, the menu item is disable... why? Shortcut key Jason Hooper23-Dec-01 9:46 Jason Hooper 23-Dec-01 9:46  When you're in the leftmost pane of the Visual C++ IDE, with the ClassWizard, FileView, ResourceView... is there a keyboard shortcut to switch between the three? I'm really big on keyboardability but have never found a way to switch between these tabs without wasting my time grabbing the mouse. Thanks. -Jason nirgle.bitdevil.com Re: Shortcut key Jason Hooper24-Dec-01 10:31 Jason Hooper 24-Dec-01 10:31  No? Ok. -Jason nirgle.bitdevil.com Re: Shortcut key Jason Hooper24-Dec-01 12:31 Jason Hooper 24-Dec-01 12:31  HA!! Thank you!! -Jason nirgle.bitdevil.com Browse for folder Peter Liddle23-Dec-01 7:58 Peter Liddle 23-Dec-01 7:58  Hey Guys I was wondering if someone could tell me the function that allows you to browse through the available drives and folders on yourcomputer and select which one to use. Cheers Peter Re: Browse for folder PJ Arends23-Dec-01 8:26 PJ Arends 23-Dec-01 8:26  SHBrowseForFolder() --- It may be that your sole purpose in life is simply to serve as a warning to others. Drawing a dotted line PJ Arends23-Dec-01 7:24 PJ Arends 23-Dec-01 7:24  Merry Christmas Everyone I hope someone can help me. I was wondering if there is an easy way to draw a line where the pixels alternate colour, I want to draw a grid over a bitmap the same way that the resource editor does, with alternating dark and light gray pixels. If I create a pen with the PS_DOT style, the dots and spaces are 4 pixels in length, and that looks like crap. Right now I am using the SetROP2() function with the R2_NOT flag. It looks good if the bitmap has light colours, but not if the bitmap has dark colours. I guess I could draw the lines one pixel at a time, but I am hoping there is an easier way. If any one knows, I would appreciate hearing from you. Thanks. --- It may be that your sole purpose in life is simply to serve as a warning to others. Re: Drawing a dotted line Christian Graus23-Dec-01 10:17 Christian Graus 23-Dec-01 10:17  You can create a pattern brush and then use that one pixel wide to generate a line. Christian After all, there's nothing wrong with an elite as long as I'm allowed to be part of it!! - Mike Burston Oct 23, 2001 Sonork ID 100.10002:MeanManOzI live in Bob's HungOut now Re: Drawing a dotted line PJ Arends23-Dec-01 22:06 PJ Arends 23-Dec-01 22:06  Works great, thanks for the idea. --- It may be that your sole purpose in life is simply to serve as a warning to others. Variable Declaration & Initialization :: C++ valikac23-Dec-01 6:16 valikac 23-Dec-01 6:16  Hi. Conventionally speaking, do you declare and initialize variables at the beginning of a function or loop or right before usage. For example: int main() { char temp; cin >> temp; cout << "1234... & " << temp; cin >> temp; cout << temp; int x; cin >> x; cout << temp << " & " << x; return 0; } The arbitrary code above depicts declaration of variables right before usage (int x). Which way is most convention is arguably better? Thanks, Kuphryn Re: Variable Declaration & Initialization :: C++ Peter Godec23-Dec-01 6:57 Peter Godec 23-Dec-01 6:57  See C++ FAQ Lite. HTH, --peter

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