C / C++ / MFC

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Re: Another String Question Tim Smith5-Feb-02 15:35 Tim Smith 5-Feb-02 15:35  WRONG!!!! You MUST call delete [] when a buffer was allocated with new []. Check 5.3.5.1, 5.3.5.2 (which specifically states that using delete on an array is undefined.), and 5.3.4.8. Also 5.3.5.6 specifically states that the destructor will be called for non-array and array deletes. It is just the case with built-in types such as int, there are no destructors to be called. It works out of luck. In earlier versions of VC, it would work in debug mode but not release. Tim Smith Descartes Systems Sciences, Inc. Re: Another String Question Nemanja Trifunovic6-Feb-02 6:11 Nemanja Trifunovic 6-Feb-02 6:11  Urgh!!! Did you read my post? Of course delete[] should be used after new[]. However, it WORKS (with VC 6.0 both debug and release) even without [], out of luck or not. It does not mean you should ever do this, but it works, and that's all I wanted to say. I vote pro drink Re: Another String Question Tim Smith5-Feb-02 15:36 Tim Smith 5-Feb-02 15:36  You are right. Check my message. It makes a HUGE difference since invoking 'delete' on an array is undefined. I have seen it crash in release builds many times. Tim Smith Descartes Systems Sciences, Inc. Re: Another String Question Jamie Hale5-Feb-02 14:41 Jamie Hale 5-Feb-02 14:41  Interesting. I was all ready to post wondering what the heck you were talking about, "calls destructors for all the objects in an array"... sounds like Java to me. But I double-checked and found you are indeed correct. However, according to my copy of C++PL, "The effect of deleting an array with the plain delete syntax is undefined, as is deleting an individual object with the delete[] syntax." So it sounds like Microsoft just decided to do it their own way. J Re: Another String Question Tim Smith5-Feb-02 15:39 Tim Smith 5-Feb-02 15:39  It works with MS out of luck. I have had many programs crash due to this error by the programmer, with VC when in release mode. Tim Smith Descartes Systems Sciences, Inc. Re: Another String Question Nemanja Trifunovic6-Feb-02 6:16 Nemanja Trifunovic 6-Feb-02 6:16  Jamie Hale wrote: Interesting. I was all ready to post wondering what the heck you were talking about, "calls destructors for all the objects in an array"... sounds like Java to me. But I double-checked and found you are indeed correct. However, according to my copy of C++PL, "The effect of deleting an array with the plain delete syntax is undefined, as is deleting an individual object with the delete[] syntax." So it sounds like Microsoft just decided to do it their own way. Exactly. Maybe there are too many programmers who forget [] I vote pro drink Re: Another String Question Tim Smith5-Feb-02 15:38 Tim Smith 5-Feb-02 15:38  First, clean up your lack of deallocations as others have stated. However, the bad news is that there is little chance doing that will fix the problem. But, maybe by freeing up the memory, those strings will be forced to trash values while in debug mode and it might help you find the problem. Tim Smith Descartes Systems Sciences, Inc. Re: Another String Question Tom Wright6-Feb-02 5:48 Tom Wright 6-Feb-02 5:48  So I guess the question is. Why would I want to bother setting and deleting a pointer to an address space, which is storing characters, when I could let the operating system do this for me by just setting the my char variables like this char StringBuf[32400]; I mean basically if I look at the class for CString.......won't I see that it is setting my StringBuf to a char array with a variable size? Tom Wright tawright915@yahoo.com not printing! 5-Feb-02 4:34 5-Feb-02 4:34  for ( numOfLines =0; numOfLines < 15; numOfLines ++) { cin>>tempCN>>tempST>>tempMT>>tempTM>>tempIV>>tempNS; (*tempStock).setCompanyName(tempCN); (*tempStock).setStockTicker(tempST); (*tempStock).setMarketTraded(tempMT); (*tempStock).setTypeOfManufactr(tempTM); (*tempStock).setInitialValue(tempIV); (*tempStock).setNumOfOutShares(tempNS); cout<< (*tempStock).getCompanyName()<<" "<< (*tempStock).getStockTicker()<<" " <<(*tempStock).getMarketTraded()<<" " <<(*tempStock).getTypeOfManufactr()<<" "<< (*tempStock).getInitialValue()<<" "<<(*tempStock).getNumOfOutShares()<< endl; this piece of code prints all those elements but the 4th one, any ideas why thank you Re: not printing! Jon Hulatt5-Feb-02 4:48 Jon Hulatt 5-Feb-02 4:48  Step 1. Do not mail me directly with a request, post it here. Thats just rude. What if I was on the toilet or something. Step 2. Lose the (*tempStock). thing. if tempStock is a class pointer, then get to its members by referencing them like this: tempStock->setCompanyName . Step 3. Use the debugger. I would think that either one of your set* functions or one of your get* functions is screwed. trace through, step by step, and see where the data goes missing. Step 4. If, and only if, you are still stuck, having tried tracing through with the debugger, then provide enough information for people to help you. To me, "4th Element" is one before a crap film. Which element? is it tempTM & setTypeOfManufactr???? if it is, say so. Also, it'd probably be useful to actually post the code for the set and get functions in question. Remember to post your code inside of <PRE> ... </PRE> tags, so that formatting is preserved. Jon Sorry to dissapoint you all with my lack of a witty or poignant signature. USB Communications Paresh Solanki5-Feb-02 4:25 Paresh Solanki 5-Feb-02 4:25  How do you do this sort of thing? I have two projects in mind. 1) write a better xfer program for my MP3 player than the one supplied with it 2) talk to devices of my own design via the USB What I would like to know is how does one go about chatting to a device on the USB port. Are there any utilities that can monitor the data that is transferred on the USB? I want to know what the xfer program sends and recieves from the MP3 player. Paresh Solanki One Tequila Two Tequila Three Tequila Floor five Tequila, six Tequila seven Tequila more Re: USB Communications 5-Feb-02 6:34 5-Feb-02 6:34  This would be advanced stuff. The USB driver itself is a kernel mode driver. To monitor operations you would probably have to write an upper level filter driver on top of the functional driver supplied for your MP3. This may exist somewhere, dunno. Just thought I'd share my own frustration with the whole API with someone MSMASK32/MSFLXGRID 5-Feb-02 4:28 5-Feb-02 4:28  Hi, I have a problem using msmask32.ocx and msflxgrid.ocx. I'm using it in an application under VC++ 6, which has an editbox using mask. But to get or set the text of the edit, an error occurs. If someone can help, please. Thanks. Otávio otavio.romao@inatel.br WMI bug or what? Mario M.5-Feb-02 4:04 Mario M. 5-Feb-02 4:04  Hi, When I try to connect to a remote computer with WMI between WinXP German edition and WinXP English it always returns "access is denied", between two english WinXP or two German WinXP computers it connects without problems. Does anyone know what's the problem ?, is it a bug in WinXP/WMI ? or I am doing something wrong? Thanks! Best Regards, Mario M. MD5 Rickard Andersson205-Feb-02 3:19 Rickard Andersson20 5-Feb-02 3:19  Can someone show me how to encrypt and decrypt with MD5?? I don't understand the classes! ------------------------------------ Rickard Andersson, Suza Computing ICQ#: 50302279 I'm from the winter country SWEDEN! ------------------------------------ Re: MD5 Joel Lucsy5-Feb-02 7:51 Joel Lucsy 5-Feb-02 7:51  MD5 is for producing a hash (or checksum). It does not do encryption/decryption. Joel Lucsy (jjlucsy@ameritech.net) Re: MD5 Le centriste5-Feb-02 11:06 Le centriste 5-Feb-02 11:06  See the Crypt* functions from the CryptoAPI in Windows Always Active Frames Alan Chambers5-Feb-02 2:49 Alan Chambers 5-Feb-02 2:49  Hi all, I'm hoping that someone knows how to specify a frame that is always active in an mdi app? I want it so that even if a child window is activated, the other frame (linked to different document type) is not deactivated (so that the title bar does not change colour from dark blue to light blue)? Any ideas would be well appreciated. At the moment I create my frames indirectly through a document template if that helps. Many Thanks, Alan. "When I left you I was but the learner, now I am the master" - Darth Vader Re: Always Active Frames Nish Nishant5-Feb-02 3:10 Nish Nishant 5-Feb-02 3:10  I believe that only one MDI child can be active at a time. If you want a frame window that's always active create it with the desktop as parent window. Dont make it a child of the MDI frame. Even then though it will be on top and visible, it wont be active if some other window is active. Nish p.s. Under normal Windows OS rules only one window will be active. Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Re: Always Active Frames Alan Chambers5-Feb-02 3:28 Alan Chambers 5-Feb-02 3:28  Yeah thats the thing, I've been at this for ages and can't get it to go. I've managed to create a frame thats on top, does everything I want, except stay active. I am sure this can be done (somehow) cos if you look at VC++ you can detach the workspace pane into a tool window which remains active despite an mdi child window (a .cpp or .h file) being active. Try it out, that is exactly what I want it to do. If it gives you any further ideas give us a shout. Thanks for looking at my problem though nish, much appreciated. Many Thanks, Alan. "When I left you I was but the learner, now I am the master" - Darth Vader Re: Always Active Frames Nish Nishant5-Feb-02 3:59 Nish Nishant 5-Feb-02 3:59  Well, when you un-dock some of the VS windows, they do appear with a blue title bar, but this does not mean they are active windows. I believe they custom-draw their title bars somehow. I am not very sure about this though. 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: Always Active Frames Joaquín M López Muñoz5-Feb-02 3:43 Joaquín M López Muñoz 5-Feb-02 3:43  Maybe creating each frame on a different UI thread? This poses all sorts of deadlock problems, however. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo Re: Always Active Frames - Done It Alan Chambers5-Feb-02 3:54 Alan Chambers 5-Feb-02 3:54  Well, I've finally done it. All you have to do is override the OnActivate() function in the CFrameWnd class and have it pass true to MFC's activation function so that : CFrameWnd::OnActivate(true, this, 0) As soon as I did this it worked no problems, just thought I'd let you guys know and say thanks for your ideas and responses. Many Thanks, Alan. "When I left you I was but the learner, now I am the master" - Darth Vader Re: Always Active Frames - Done It Nish Nishant5-Feb-02 4:05 Nish Nishant 5-Feb-02 4:05  Alan Chambers wrote: CFrameWnd::OnActivate(true, this, 0) I am surprised that worked The first argument is actually a state which can be one of WA_INACTIVE, WA_ACTIVE or WA_CLICKACTIVE. And you have passed true. Anyway good for you Nish p.s. By the way this only stops them from going un-blue. The fact that only one window will be focally active remains. Sonork ID 100.9786 voidmain www.busterboy.org If you don't find me on CP, I'll be at Bob's HungOut Draw an ImageMagick image on a GDI DC Uwe Keim5-Feb-02 1:46 Uwe Keim 5-Feb-02 1:46  Using ImageMagick (www.imagemagick.org), I now want not only to load, convert and store images, but also display them in an Windows window (i.e. its Device Context DC). On the page http://www.simplesystems.org/ImageMagick/Integration/ there are two packages (WinExt and DisplayUsingCDib2) mentioned. But the first is using an outdated version of ImageMagick and the second link is dead. Question: has anyone successfully tried to display an ImageMagick image inside a Windows window and can contribute a small code-snippet or even a complete function like e.g. void DrawImageToDC( Magick::Image src, HDC dst_dc ) -- See me: www.magerquark.de

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