C / C++ / MFC

FirstPrevNext

Re: Forcing bits Ravi Bhavnani7-Aug-02 14:58 Ravi Bhavnani 7-Aug-02 14:58  dwStyle |= WS_VISIBLE; /ravi Let's put "civil" back into "civilization" http://www.ravib.com ravib@ravib.com Re: Forcing bits alex.barylski7-Aug-02 15:23 alex.barylski 7-Aug-02 15:23  Thanx "An expert is someone who has made all the mistakes in his or her field" - Niels Bohr Re: Forcing bits MSH_ILC7-Aug-02 15:14 MSH_ILC 7-Aug-02 15:14  I believe that you use the (dwStyle & WS_VISIBLE) to test if WS_VISIBLE bit is set in dwStyle, which might help you with what you want. However a better way to do this is to use the OR operator ( it's the | : shift+\) the OR operation results in true if any of the arguments was true and false if none were true. ie 1 or 1 = 1 1 or 0 = 1 0 or 1 = 1 0 or 0 = 0 while the AND (&) is only true if both arguments were true. Since WS_VISIBLE is always true, the | operator with dwStyle and WS_VISIBLE will always force the bit you are interested in to true. The usage should be along the lines of: dwStyle= dwStyle | WS_VISIBLE; This will make sure that the flag bit is forced to true while the rest of the bits are unmodified (since WS_VISIBLE has only one bit turned to true). exp: dwStyle 1001110101110111 WS_VISIBLE 0000000010000000 Binary OR (|) 1001110111110111 this is called the Binary OR since it compares bits and results in bits, & is Binary AND too. && and || are the logical operators and compare the arguments bit by bit by return only true or false. Please correct me if I'm wrong, it's been quite a while ... -<msh>- Young Basic programmers never die... they just GOSUB and never RETURN. Re: Forcing bits alex.barylski7-Aug-02 15:24 alex.barylski 7-Aug-02 15:24  Thanx "An expert is someone who has made all the mistakes in his or her field" - Niels Bohr Re: Forcing bits PJ Arends7-Aug-02 15:31 PJ Arends 7-Aug-02 15:31  http://www.codeproject.com/cpp/bitbashing.asp CPUA 0x5041 Sonork 100.11743 Chicken Little "So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies Within you lies the power for good - Use it! Multithreading :: MFC valikac7-Aug-02 14:33 valikac 7-Aug-02 14:33  Hi. I am using multithread quite often now in my program when appropriate. According to Jeff Prosise, there are two simple ways of using multithreading correctly, especially worker threads. ----- 1: private HANDLE + duplicating thread handle upon instantiation This solution make use of ::CloseThread(...) 2: private pointer to CWinThread + delete private member This solution requires setting thread autodelete to FALSE and deleting thread manually. ----- Right now, I am using solution #2. The reason is I would know the thread is really gone because I delete, not MFC. Nonetheless, I have seen developers use both. Jeffrey Richter uses solution #1 in his book, Programming Applications for Microsoft Windows (Dv-Mps General). Are there advantages one solution has over the other? Thanks, Kuphryn MSComm32 Frank Deo7-Aug-02 13:35 Frank Deo 7-Aug-02 13:35  A few weeks ago, I posted a message about a wierd while loop that wouldnt exit when the subjected control returned "Connected". OK, problem solved. Just for the curious, the input was being added a few characters at a time, and although the TRACE0 showed the "Connect 300", it was broken up. When I added all the strings together it worked. On to my next major hassle. Normally I fight with a problem for a few weeks before trudging all over you nice folks for an answer. This is the case now. Why, in gods name, would the MSCOMM32 control stop receiving data? Here's the ugly details. My app calls a function "Connect" that connects the modem to a remote host. When the function showes connected, it returns. Another function is then called to handle the send / receive of data through the port. Its here that things get all bunged up. I can send data. PortMon (http://www.sysinternals.com[^]) shows the sent data going through the port. But, nothing comes back! When I connect using HyperTerminal. All works normally. What in the hell could I be doing wrong here? Thanks for any help, and sorry about the long explaination. Frank Trouble w/ Multithreaded Windows Service Please Help Aisha7-Aug-02 13:29 Aisha 7-Aug-02 13:29  Hi, I wrote a multi-threaded application that sends/recieves documents on a scheduled/event driven basis. It works fine as a console application the files are being sent and the CPU usage is around 30%. My problem is when I have the exact same code in a Windows Service application. When the service is using one thread to send documents it also works fine, but if there is more than one thread running at one time the CPU usage shoots up to 100%. Could someone please help me? Thanks P.S. The applcation is also using the System.Timer and File System Watcher. Thanks Again, Aisha Re: Trouble w/ Multithreaded Windows Service Please Help Todd Smith8-Aug-02 18:39 Todd Smith 8-Aug-02 18:39  If you're doing a loop you might want to add a Sleep(50) in there to give other tasks a chance. Todd Smith about Outlook rev7-Aug-02 13:24 rev 7-Aug-02 13:24  HEllo, I am want to add some images to the Outlook 2000 using VC++, So that I can inbsert some of them to the emails that I will write. I am a new VC++ programmer. Please help me tohow to code this and give me suggestions. Thanks dialog danag7-Aug-02 13:13 danag 7-Aug-02 13:13  where do i validate the dialogs data? Is it in the views member function? pl give me an idea. Thanks dana Re: dialog Chris Losinger7-Aug-02 13:15 Chris Losinger 7-Aug-02 13:15  i usually override OnOK in the dialog and do any validation there. if the validation fails, tell the user what happened and then return, don't call CDialog::OnOK. -c WWJD? JWRTFM.    found on /. image effects! Re: dialog danag7-Aug-02 14:04 danag 7-Aug-02 14:04  Ok, I can override the OnOk function to do my validation, but how to i make the users data to be transferred to the dialog's member variable? do i have to call the DoDataExchange function?? Re: dialog Chris Losinger7-Aug-02 15:06 Chris Losinger 7-Aug-02 15:06  in OnOK, call UpdateData, first. this will send all the data through the DDX functions and into whatever variables you've attached to the controls. then you can look at the member variables and do your other validation. -c WWJD? JWRTFM.    found on /. image effects! Re: dialog Christian Graus7-Aug-02 13:24 Christian Graus 7-Aug-02 13:24  Validate how ? If you're using DDE, then the data validates itself at the time of entry. Christian We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum ) Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002 Re: dialog danag7-Aug-02 13:26 danag 7-Aug-02 13:26  it is for validating the string entented in the textbox? to my knowledge, i think we can validate only the max. length of the string in DDX functions? am i correct or not? Re: dialog Christian Graus7-Aug-02 13:44 Christian Graus 7-Aug-02 13:44  Yes. DDX sucks in any case, you should probably follow Chris' advice and validate in OnOK. Christian We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum ) Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002 How to implement Global Pointers ? oRion7-Aug-02 13:06 oRion 7-Aug-02 13:06  I have implemented global variables with the method that is going round this message board. That is to write a header file with all my global variables and a corresponding .cpp file to call it. global.h namespace myspace{ extern int myvar,*myptr; } global.cpp int myspace::myvar,*myspace::myptr; This work perfectly;), but I need my pointer to be initialize with new() statement for the first use. I would like to put it in the global.cpp file so that this is done automatically when this global file is being used. How do I do that? Could I do it using Class ?? If the new() statement is implemented in the constructor, would this means every class derive from this Base Class, would call new() statement in the constructor? This means redudant memory allocation is done here? Re: How to implement Global Pointers ? Christian Graus7-Aug-02 13:13 Christian Graus 7-Aug-02 13:13  There is no class here, only a namespace. You just said they were globals, didn't you ? You can call new in the .cpp file. You could also assign to NULL, and have your classes call new if NULL. Christian We're just observing the seasonal migration from VB to VC. Most of these birds will be killed by predators or will die of hunger. Only the best will survive - Tomasz Sowinski 29-07-2002 ( on the number of newbie posters in the VC forum ) Cats, and most other animals apart from mad cows can write fully functional vb code. - Simon Walton - 6-Aug-2002 Re: How to implement Global Pointers ? Anonymous8-Aug-02 17:59 Anonymous 8-Aug-02 17:59  Thanks for the reply. I will try it out. Thanks a million! Re: How to implement Global Pointers ? Chris Losinger7-Aug-02 13:14 Chris Losinger 7-Aug-02 13:14  do your "new" in your CWinApp's InitInstance. -c WWJD? JWRTFM.    found on /. image effects! Re: How to implement Global Pointers ? Todd Smith8-Aug-02 18:35 Todd Smith 8-Aug-02 18:35  Declare a class in global.cpp and make a single instance of that class class CGlobal { private: CGlobal() { myptr = new int[32]; } ~CGlobal() { delete [] myptr; } }; static CGlobal globalInit; oRion wrote: If the new() statement is implemented in the constructor, would this means every class derive from this Base Class, would call new() statement in the constructor? This means redudant memory allocation is done here? Yes. Just don't derive from the class. That can be prevented by making the constructor private. The other option is to make a GlobalInit() and GlobalCleanup() function which does your allocations and call it at the beginning of your program. Todd Smith Re: How to implement Global Pointers ? oRion9-Aug-02 4:43 oRion 9-Aug-02 4:43  Todd Smith wrote: Declare a class in global.cpp and make a single instance of that class class CGlobal{private: CGlobal() { myptr = new int[32]; } ~CGlobal() { delete [] myptr; }};static CGlobal globalInit; Thanks for the reply. I understand the portion on using private for constructor. Could u help tell me more of the statement on static CGlobal globalInit; ? Where should this be declared in? Why is there a need to declare it as a static ? Paradox database ... Hadi Rezaee7-Aug-02 12:55 Hadi Rezaee 7-Aug-02 12:55  Hi there, I have a paradox database ... I want to open this database by ADO ... Can i open this database by ODBC driver ? If yes, i must update my MDAC, is it right ? I already download MDAC 2.7, can i work with that for opening paradox ? Please help me ! My month article: Game programming by DirectX by Lan Mader. Please visit in: www.geocities.com/hadi_rezaie/index.html Hadi Rezaie Access DB alex.barylski7-Aug-02 12:00 alex.barylski 7-Aug-02 12:00  If I create an application and use an Access database and a user installs my app on their computer without Access installed, will my application still work...? Basically is the Access driver a DLL which I can distrubute with my own applications...??? Thanx! "An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Last Visit: 31-Dec-99 18:00     Last Update: 6-Oct-24 22:27 Refresh ᐊ Prev1...16460164611646216463164641646516466164671646816469 Next ᐅ

General    News    Suggestion    Question    Bug    Answer    Joke    Praise    Rant    Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.