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callback of a class' method Jerome Conus12-Sep-04 23:29 Jerome Conus 12-Sep-04 23:29  Hi ! I'm calling a function of a api to which I have to give a pointer to a callback function. Here is the typedef : typedef int (*proc_restore_progress_callback)(restore_progress_data*) The problem is that I want, as the callback method, to pass a method of my own class. I tried something like this : api_set_restore_progress_callback(JSPartLoader::setRestoreProgress);*) Here is the signature of the 'setRestoreProgress' method : int JSPartLoader::setRestoreProgress(restore_progress_data* pProgressData);*) But I get a compiler error : error C2664: 'set_restore_progress_callback' : impossible to convert the parameter 1 from 'int (restore_progress_data *)' to 'proc_restore_progress_callback' Is it possible to give a class' method as the callback function or do I have to have a global function which will be the callback function ? Thanks for your help ! Jerome Re: callback of a class' method Antti Keskinen13-Sep-04 2:26 Antti Keskinen 13-Sep-04 2:26  This problem is related to the class abstracty concept. As you specify that ClassA::MethodA is a callback function for some other function, then how, at run-time, can then code determine the correct instance of class ? The problem is most often faced in wrapping Win32 API functions inside C++ classes. GameDev.Net has an excellent article about this, here[^]. If you wish to use a class method as callback's target, the method must be declared static, or you need to have a static router function that can flawlessly determine the instance to which the method should be routed. Also, there is a Code Project article written by Nitzan Shaked here[^] that provides yet another approach to the problem. Hope this helps.. -Antti Keskinen ---------------------------------------------- The definition of impossible is strictly dependant on what we think is possible. Re: callback of a class' method Jerome Conus13-Sep-04 2:36 Jerome Conus 13-Sep-04 2:36  Many thanks for your help Antti ! I'll have a look at the different methods you suggest ! Thanks, Jerome memory leaks in mfc nnvidya12-Sep-04 22:52 nnvidya 12-Sep-04 22:52  Is there anybody who worked on memory leaks in MFC, whenever a model dialog is open there is an increase of 4 k bytes of memory and when it is closed it is not released. And also whenever a spin control is used for the first time there is an increase of memory which is not reduced when the dialog is closed. Why it is like this? where is the leak? vidya Re: memory leaks in mfc Jon Hulatt13-Sep-04 1:42 Jon Hulatt 13-Sep-04 1:42  http://www.flounder.com/howbig.htm[^] read that article. are you *sure* it's a memory leak? i'd be very suprised. using System.Beer; Re: memory leaks in mfc nnvidya13-Sep-04 1:56 nnvidya 13-Sep-04 1:56  Yes there is a leakage, when my application is started it is having only mainframe that time the memory in task manager is 3500k now i opened one dialog from the menu bar...and the memory increased to 3788k when i closed that dialog the memory is not reduced back to 3500k why it is like this? Is there any virtual function i need to call for this dialog? In that dialog i am not allocating anything still when the dialog is initialized the memory is increased by not decreased on closing of that dialog. vidya Re: memory leaks in mfc Mike Beckerleg13-Sep-04 3:43 Mike Beckerleg 13-Sep-04 3:43  The symptoms you have described do not mean it is a leak. What happens if you repeatedly open and close the dialog? Does the memory keep increasing each time or does it stay at 3788k? I expect it will stay at 3788k or whatever indicating that it is not leaking. Mike Re: memory leaks in mfc Alexander M.,13-Sep-04 5:07 Alexander M., 13-Sep-04 5:07  visual studio .net normally shows up memory leaks after the program exited. try to execute the debug version of your software via vs .net. Don't try it, just do it! Re: memory leaks in mfc Bob Stanneveld13-Sep-04 5:52 Bob Stanneveld 13-Sep-04 5:52  Did you actually read the article that Jon Hulatt was referring to? It explains why your memory used by your app doesn't decrease... Multiply it by infinity and take it beyond eternity and you'll still have no idea about what I'm talking about. Re: memory leaks in mfc nnvidya14-Sep-04 1:10 nnvidya 14-Sep-04 1:10  Dumping objects -> {462} normal block at 0x00628CE0, 36 bytes long. Data: <192.168.100.83 S> 31 39 32 2E 31 36 38 2E 31 30 30 2E 38 33 00 53 strcore.cpp(118) : {456} normal block at 0x00628D30, 23 bytes long. Data: < Prod> 01 00 00 00 09 00 00 00 0A 00 00 00 50 72 6F 64 strcore.cpp(118) : {455} normal block at 0x00628D80, 30 bytes long. Data: < name> 01 00 00 00 10 00 00 00 11 00 00 00 6E 61 6D 65 strcore.cpp(118) : {454} normal block at 0x00628DD0, 29 bytes long. strcore.cpp(118) : {331} Memory leaked! I am getting like this when i use DumpAllObjectsSince(); while checking for memory leakage. Where is the leakage? vidya Re: memory leaks in mfc Bob Stanneveld14-Sep-04 8:02 Bob Stanneveld 14-Sep-04 8:02  Hello, Maybe you are doing some things with a CString that you shouldn't. For exemple when you manipulate the CString contents directly without calling CString.ReleaseBuffer() will result in behaviour you don't want... Multiply it by infinity and take it beyond eternity and you'll still have no idea about what I'm talking about. Re: memory leaks in mfc nnvidya13-Sep-04 20:39 nnvidya 13-Sep-04 20:39  I read this article. Thanks. Can you suggest some other tools(evaluation copy) for checking memory leakage in a souce code. I think we wont get an evaluation copy of Bound Checker. vidya Re: memory leaks in mfc nnvidya14-Sep-04 22:46 nnvidya 14-Sep-04 22:46  I have a MDI application when it is created the memory occupied for that application in task manager is around 2000K i open some document in that MDI application, the usage of memory grows up. Now i minimize the main frame window and i notice in task manager the memory is decreased to around 1000K. I think the resouces which were not used are released when the mainframe is minimized. Please let me know if anybody knows.... Which function is called when the mainframe is minimized? How the resources are released when it is minimized? vidya Re: memory leaks in mfc nnvidya15-Sep-04 20:13 nnvidya 15-Sep-04 20:13  Thanks. I got the solution for this go through this link http://support.microsoft.com/default.aspx?scid=http://support.microsoft.com:80/support/kb/articles/Q293/2/15.asp&NoWebContent=1#appliesto vidya com port settings anuchelvi12-Sep-04 22:06 anuchelvi 12-Sep-04 22:06  I need to design a dialog based application in vcpp through which i need to send and receive data through the com port. Still now,i've completed the part through which i can send and receive data using a buffer. i've not included the com port module so far. 1) In my menu options i've included all the ports, but the ports which r presently connected to the system should be enabled. 2) I've to configure the port, even if it is connected or not. 3)By choosing that particular port, i need to connect and send and receive data through it. mithila Re: com port settings Hardy_Smith12-Sep-04 23:44 Hardy_Smith 12-Sep-04 23:44  Look at http://www.codeproject.com/system/serial.asp ( CSerial ) or at the wfc, there is a serial class. or http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnfiles/html/msdn_serial.asp Good Luck, Hardy. Re: com port settings anuchelvi13-Sep-04 1:49 anuchelvi 13-Sep-04 1:49  Hi, I'm using menu in my module. The ports which r present in the system should be enabled in the menu. How is it possible? mithila mithila Re: com port settings Hardy_Smith13-Sep-04 2:35 Hardy_Smith 13-Sep-04 2:35  The CSerial- class has a "Open" and "Close" Method and it can be configured. So call open from your menu's message-handler to open the comport , but take care that you write the configuration before. To close it, just call the close-Method. I think there is a example-App with CSerial. Hardy. Hai Asha Rams12-Sep-04 21:50 Asha Rams 12-Sep-04 21:50  hello , I am doing a project where i have get a letter format for a record which is in database other words connect a primary key from the database for a record so that to get a letter automatically related to that record please any one can help me bye Re: Hai Hardy_Smith12-Sep-04 23:49 Hardy_Smith 12-Sep-04 23:49  And where do you need help? In designing the database, in asking the database ( sql ) or in reading the answer ( c++ ) Hardy. Re: Hai Asha Rams13-Sep-04 2:09 Asha Rams 13-Sep-04 2:09  while designing database and able view useing VC++ Re: Hai Hardy_Smith13-Sep-04 2:46 Hardy_Smith 13-Sep-04 2:46  Database design: http://www.edm2.com/0612/msql7.html Accessing with VC++: www.codeproject.com/database/odbcrecordset.asp And for a Database look at www.ibphoenix.com and get Firebird. Re: Hai Asha Rams13-Sep-04 17:19 Asha Rams 13-Sep-04 17:19  thanks for the information , while let me tell u that i got many information by u r replay , But have to make a report for a record in the database with contain certain information , which should be related to the database beacuse each record report will be haveing some default details and some unique information , thank you How to edit or operate Windows registry Na_Su12-Sep-04 21:47 Na_Su 12-Sep-04 21:47  Hello. I'd like to ask about how to edit or operate Windows registry. This question might be related to Windows Shell Programming... Who knows how to delete item(s) from context(pop up) menu when right-clicked in explorer? The way is not by using ".EnableWindow(FALSE)" but by editing or operating of Windows registry. I don't know in which path(place) of registry and what editing or operating of registry key(s) or value(s). Concretly, the items I'd like to delete are "print", "cut" and "copy". After editing registry and reboot, this result is effective whole Windows System. Finally, I'd like to make ".dll" file which upper things are able. Please tell me if anyone knows. Re: How to edit or operate Windows registry Arsalan Malik13-Sep-04 0:03 Arsalan Malik 13-Sep-04 0:03  I don't think you can achieve this through registry modification. Do you know the key/value in registry to modify?? ARSALAN MALIK

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