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ForNow wrote: ... this is only when the user press "X" in the right hand window corner
When the user press "X" in the right hand window corner no data from dialog controls are read in the control data variables. It is by design.
If you'd like to change this default behavior then you had to override the OnCancel method.
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The data was saved in the Class/Object storage in my Onok handler
Does it not remain intact till I do the EndDialog which I do from the routine which did the the DoModal ?
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The Data is probably still there you have blown the stack I suspect. Read the documentation again
CDialog::OnCancel[^]
Read it carefully because it is very specific.
If you implement the Cancel button in a modeless dialog box, you must override the OnCancel method and call DestroyWindow inside it. Do not call the base-class method, because it calls EndDialog, which will make the dialog box invisible but not destroy it.
So your Dialog when cancelled will be invisible and not destroyed and I suspect your stack just got toasted hence the reason for the big warning.
So do what it asks override the OnCancel method calling DestroyWindow inside it because there is a reason the framework requires that and I am guessing not doing it will be a very bad idea. I can't tell you why it has to do that it is something to do with the framework implementation.
In vino veritas
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ForNow wrote: The data was saved in the Class/Object storage in my Onok handler
So the OnOK() method is being called when you click the "X" in the upper-right corner?
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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No David its a Modeless dialog pressing the Ok button doesn't close the dialog like on a normal modal dialog.
To close the dialog right now he is using the "X" in the upper-right corner.
He is probably going to put some other button on screen to exit but its a stock standard modeless dialog.
His comment above makes perfect sense in that light, he put data in a structure shouldn't it still be there and the answer is normally yes.
The problem is his exit he is doing isn't as per what the framework manual specifies for modeless dialogs.
The framework specifies the exit for a reason, hence its a good guess the problem is ... and bad things are happening 
In vino veritas
modified 18-Apr-16 10:32am.
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leon de boer wrote: No David its a Modeless dialog pressing the Ok button doesn't close the dialog like on a normal modal dialog.
As long as that method calls DestroyWindow() rather than CDialog::OnOK() (which internally calls CDialog::EndDialog()), the dialog will close just fine.
leon de boer wrote:
He is probably going to put some other button on screen to exit but its a stock standard modeless dialog.
There is no standard that dictates what UI element is used to close a modeless dialog. It could be Esc, the "X", Alt+F4, or a Cancel/Close button. Instead, it's what the code behind those elements do that's important.
I'm well aware of how modal and modeless dialogs behave. My question was not because I wanted to know the answer to something; it was instead asked to make the OP reconsider his design. Clicking the "X" button should call OnCancel() method.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Hi
I have a CAsynSocket as a member of a CwinThread (having each socket connection in its own thread)
The program is acting as Client When I do a connect everything goes as a planned I get the
OnConnect Notification and OnSend (though they always come in the context of the Main
Thread).
Since I would like to know when this happens I Wait on a CEvent. The CEvent is a member
of the CwinThread. The only problem is that when I do the WaitForSingleObject
nothing happens (as far as notification OnSend OnConnect)
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WaitForSingleObject will suspend the entire thread it's running in
So your OnSend and OnConnect code better not be on that thread or they will never be called which is what you are saying !!!!!!!
It's called a deadlock the only thing that can release the WaitForSingleObject is an event that will never be sent because the detecting code to create the event will never run.
Sounds to me like you need to get out a pen and paper again and work out the logic of the threads.
In vino veritas
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Hi
Thanks I think that in any scenario (CAsynSocket being a member of a CWinThread)
socket notification always happen in the context of the main thread
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First off let me say I am by trade a MainFrame Programer
In Z/os you can issue a wait anywhere in a task or thread and it will suspend that unit of work or program. In MVS many programs comprise a task
The program information is saved in a RB block
But the task or Thread doesn't stop
I understand this is not the case in Windows
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You need to understand this isn't even about Windows you are using a framework and you need to understand the framework.
Windows if you were dealing with the API can do some very different things and in your case the framework determines the behaviour because it was designed with a concept in mind.
Since you seem to need proof the thread is blocked make the wait 10 seconds and look for the timeout
DWORD Ret=WaitForSingleObject(yourEvent, 10000);
if (Ret==WAIT_TIMEOUT)
{
TRACE("*** Houston we have a Timeout ... Thread blocked LdB right ***\n");
}
If I am right you will get that message 10 seconds later .. so easy to test with 3 lines of code
The solution is play nicely with CAsynSocket or go direct down onto the Windows API and do the socket work yourself. I don't doubt your programming ability just your understanding of the Framework.
In vino veritas
modified 17-Apr-16 3:48am.
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I don't need proof I know you are right thanks for explaining
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Changing the visual style of an application causes handle leaks. In CMFCVisualManager there exists a function UpdateSystemColors, which is called three times when the style is changed. Every call opens theme handles. Below the UpdateSystemColors is a function CleanUpThemes, which closes the theme data handles. This function is only called once when the style changes. This causes 38 handles which will not be closed afterwards.
I've looked for a possibility to fix this in source code, but this needs to compile the MFC lib on my own, but there is no makefile for it...
Any thoughts?
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Hi All,
I am struggling these days in creating an MFC application which has following problem statement:
--> In MFC, Create an UI list control which will
populate data from one table using db connectivity.
What I have done so far :
--> Created a SDI MFC application,
--> Able to connect to db, fetch record in "Edit Box" and traverse between records(First,Last,Next,Previous).
where I am stuck:
--> I am not able to populate these records in List control. I have taken reference from "c++ - How to add items to a List Control in an MFC dialog - Stack Overflow[^]"
but it has asked to write code under "OnInitDialog" method which is not present in SDI application. Though I can able to see this method in Dialog based MFC application but not in SDI application.
Request you to all to please help me.
Thanks,
Sanjeev
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With not dialog based applications you should derive your view class from CListView Class[^]. That can then be populated with the recordsets using the CListView::GetListCtrl[^] function to get a reference to the list control. The OnInitDialog() corresponding function for views is CView::OnInitialUpdate[^]. See also the example code at the GetListCtrl() link.
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I don't understand clearly what is the difference between compiled and interpreted? As they all are translated to another language when they are build.
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Mur2501 wrote: As they all are translated to another language when they are build.
That's just it... interpreted languages aren't really translated to another language, they are kept in their original format until run by the user. When the user runs the program, he's really running the interpreter, which takes the script in and interprets what is to be done.
The definition is not always as cut and dry as you might think, there are a lot of languages nowadays that produce byte-code or some other in-between by-product that will be further interpreted at run-time.
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Another difference to consider is their behavior.
For an interpreted language, the program is run line-by-line when you request it to run. If there is a problem in the logic or any other 'bad things', it will run until it hits one. Thus, if you misspelled a variable's name it wouldn't react to it until you run it and it happens to come across the misspelled version. Also, if you left out a BEGIN or END statements, it would run until that caused a problem, if ever. Some feel that these languages are easier for beginners to start with because they're not all-or-nothing, but not everyone agrees with that.
Now, for a compiled language, the entire program is converted to 'machine code' (often in several steps). This code has to take the entire program into consideration at once. If you have a problem it will not be able to figure out what to do and you'll get an error. The program will NOT be compiled. A misspelled variable is 'undefined' and would be a problem. Similarly, the compiler will look for an END for every BEGIN, in the correct order or it will be an error. Compiling a program is an all-or-nothing affair.
Because of this difference in when the program is turned into real computer instructions, the interpreted languages are much slower than compiled languages when running.
| "The difference between genius and stupidity is that genius has its limits." - Albert Einstein | | "As far as we know, our computer has never had an undetected error." - Weisert | | "If you are searching for perfection in others, then you seek disappointment. If you are seek perfection in yourself, then you will find failure." - Balboos HaGadol Mar 2010 |
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Many people are stating that let us c is old and hard but when I read it there was no problem rather than the ide(but I am already known how to use a ide, Code::Blocks) and it was also the one book from which I get the idea of the technical things cause it is easy to understand. So what I do change it and go to a new book or remain firm on it?
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That is hardly a question that can be answered here. You need to decide for yourself which way you want to go in your career, and research which books may help you.
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In programming there is no better or worse languages they are just tools and most of programming has nothing to do with the language, it is about the process behind the programming. In the commercial industry we refer to people who like to push a language in the derogatory term codermonkeys and generally at a job interview saying xxx language is a better language will see you immediately overlooked. If you make programming a career you will probably code fluently in a at least 3 or 4 languages and probably dabble and have limited understanding in 3 or 4 more.
C is indeed old and it can be hard but it and Java are also the most widely used programming language. In some sections of industries it is in fact the only choice and here I refer to industries like microcontroller industry. The manufacturers for those processors don't make programming tools and so generally the only options is assembler or C.
The current spectrum rating on most widely used languages is (1)Java,(2)C,(3)C++,(4)Python,(5)C# .... daylight to everything else
So most the bulk of us old commercial programmers can write in two of the three (Java,C,C++).
So that is the commercial world but that all said if you are just programming for fun feel free to use whatever language works for you. The language does not change the problem at all, if I ask you to write a bubble sort algorithm the language does not change the problem. Rosettacode.org actually lists the code for a bubble sort in 117 programming languages and none of them are better or worse than any other they all confirm to the same pseudocode.
The ability to Pseudocode is what seperates programmers from codermonkeys and you may care to read about it from wikipedia. Any real programmer can write what they are doing in pseudocode and that pseudocode requires no choice of language showing ultimately just how irrelevant the chocie of language is.
The choice of language generally comes down to availability and ease of use of the compiler and tools and your familiarity with it.
In vino veritas
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You're(Leon de Boer) extremely right at the answer. Well I am not discriminating any programming language and I also believe that every programming language has its own power and uses. I also decided to learn C cause I want to be a system programmer as Java is not suitable for many low level services but C/C++ are one that has the pride.
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Hi,
Well, there are a few considerations here. 'C', 'CPP' are examples of languages which produce code running close to the OS, and the Hardware. One works there on the coal face, dealing directly with actual memory locations, and de Operating System. the vagarities of the hardware components, etc. This can lead on occasion to hard to detect bugs, and crashes. A Strash is a famous example. Another consideration is that the Supplier of the OS can literally pull the carpet from underneath your feet, by deprecating your favourite OS. Another disadvantage is that you must maintain different versions of Source Code if you want toi write for more than One Platform.
On the other hand, just because you deal directly with the OS and Hardware, you can do all sorts of tricks that cannot be done in'Synthetic' languages, such as say C# or Java. These languages run on a 'Virtual Machine' in a 'Virtual Environment' When you find yourself in such an environment, you may forget about playing even the most innocent trick. That virtual machine knows nothing about memory, but talks in variables. The advantage here is, that this a far more friendly environment to write in, it tries not to allow you to write wrong code. Also, your code will probably run from now till kingdom come on every computer and OS.
Now, it should also be remembered, that as a society, we cannot ever dispense with languages such as C and CPP. Languages such as C# Java, and many others are actually written using 'C' and 'CPP'
I personally think that you could do worse than learning 'C' and 'CPP', in particular if in the latter you incorporate 'MFC'
Note: C# Java, vs 'C' and 'CPP' are very similar in syntax. The devil is in the syntactical detail!!!
Regards,
Bram van Kampen
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Hi there.., i am learning opengl from the NeHe tutorials(NO GLUT).
i am getting the error
undefined reference to 'auxDIBImageLoadA' while compiling.
i am using codeblocks.
the codeblock is:
AUX_RGBImageRec *LoadBMP(char *Filename)
{
FILE *File=NULL;
if(!Filename)
{
return NULL;
}
File = fopen(Filename,"r");
if(File)
{
fclose(File);
return auxDIBImageLoad(Filename);
}
return NULL;
}
I have added libglaux.a already in the linker settings.
HELP!!!!
modified 7-Apr-16 11:10am.
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