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Thanks, Ramu Sign In·ViewThread·Permalink ON_UPDATE_COMMAND_UI and CDialog's Sprudling26-Jun-02 6:11 Sprudling26-Jun-02 6:11 I have an MFC dialog based app, and ON_UPDATE_COMMAND_UI just doesn't work. It's a tool; use it properly and it will help you; but don't blame the tool if you use it improperly. So the C++ language guarantees that it will call terminate() at this point, and terminate() kills the process. dazinith26-Jun-02 3:39 dazinith26-Jun-02 3:39 I am trying to use a property page inside of a few different dialogs..

Does chilli get milder with cooking? Exception handling is a convenient whipping boy. We are using plain non-managed VC++ code with lots of MFC. more hot questions lang-cpp about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Science Other

One way out is to ask yourself this question for each try block: "Why am I using a try block here?" There are several possible answers: Your answer might be, "So Downloads Comments Do Herb Erectile Dysfunction Pills Offer Stronger And Rock Hard Erection? You can also use smart pointers to "point" to disk records or objects on other machines. Note that this code doesn't deal with the annoying newline that Microsoft appends to the error message.

If that is you, there is still hope: get a mentor. I'm still not convinced: a 4-line code snippet shows that return-codes aren't any worse than exceptions; why should I therefore use exceptions on an application that is orders of magnitude larger? Is there a site that I can go to that can give me a run through on how to write out to a database? Even if you win the rat race, you're still a rat.

So how we will be able to know whether connect() established connection or not ??? Any help will be great. Connect with top rated Experts 10 Experts available now in Live! Here are some "wrong exception-handling mindsets" in no apparent order: The return-codes mindset: This causes programmers to clutter their code with gobs of try blocks.

An improved CWinAPIException class Usually MFC exception classes only give the error description, as for example "Path not found". C# questions Linux questions ASP.NET questions SQL questions VB.NET questions discussionsforums All Message Boards... By making your exception class inherit (ultimately) from the standard exception base-class, you are making life easier for your users (they have the option of catching most things via std::exception), plus In the latter case, you should definitely fix the bug in the caller's code.

share|improve this answer answered Jun 28 '10 at 14:09 Marcin 6682725 add a comment| Not the answer you're looking for? share|improve this answer answered Jun 29 '10 at 7:50 sharptooth 109k50317709 add a comment| up vote 0 down vote I think he wants to make it log that an error occurred, Shouldn't TS accepted this answer? –swdev Apr 15 '14 at 20:47 If it's necessary for a further throwing there is a simpler way to do it in C# with Sometimes you need to extend MFC by writing your own classes with corresponding exception classes.

return 0; } int f8() { // ... This gets really messy for classes composed of several objects, especially if those sub-objects depend on each other. Win32 weirdness. If you're using MFC and catching one of their exceptions, by all means, do it their way.

Notes: I like using ATL/MFC CString in Win32 code, I find it very convenient This code is designed for Unicode builds, e.g. In this case, you should not. Falcon Homepage : Sonork = 100.16311 "But everybody darlin' sometimes bites the hand that feeds." "Remember in this game we call life that no one said it's fair." "Just because you're I'll me so thankfull to you.

Falcon Homepage : Sonork = 100.16311 "But everybody darlin' sometimes bites the hand that feeds." "Remember in this game we call life that no one said it's fair." "Just because you're Some compilable code of mine follows. By the way, if you think your Fred class is going to be allocated into a smart pointer, be nice to your users and create a typedef within your Fred class: Sign In·ViewThread·Permalink Re: Form objects limit RuiSantiago26-Jun-02 5:44 RuiSantiago26-Jun-02 5:44 Well, i'm kind of new with Visual C++, i understand the function of DoDataExchange, i read a bit about DDP

Stroustrup seriously considered the possibility of allowing resumption when he designed the C++ exception handling mechanism and this issue was discussed in quite some detail during standardization. The industry as a whole has seen many millions of lines of code and many person-centuries of effort using exceptions. I'm turning into a grapefruit! Every data member inside your object should clean up its own mess.

Remember that constructors are often invoked to initialize/construct objects in variables: vector v(100000); // needs to allocate memory ofstream os("myfile"); // needs to open a file The vector or ofstream (output Join them; it only takes a minute: Sign up how to get message of catch-all exception [duplicate] up vote 11 down vote favorite 2 This question already has an answer here: For convenience, it's displayed below. Kuphryn Sign In·ViewThread·Permalink Database ( table Update/Delete) Anonymous26-Jun-02 6:15 Anonymous26-Jun-02 6:15 I am using ODBC to acess Mysql DB ..

Though of course it would probably be an immense burden for the compiler having to generate all those separate code paths... –Damon Jul 8 '11 at 14:18 add a comment| 5 Here is the equivalent code that uses return codes: int f1() { // ... There is no really satisfactory alternative to exiting a constructor by a throw. return 0; } int f9() { // ...

Here is the code if exceptions are used: void f() // Using exceptions { try { GResult gg = g(); HResult hh = h(); IResult ii = i(); JResult jj = Here is the complete CWinAPIException class: class CWinAPIException : public CException { DECLARE_DYNAMIC(CWinAPIException) // Constructor private: CWinAPIException(DWORD dwError, LPCTSTR pszFile, UINT nLine, COleDateTime& odtTime); // Attributes private: DWORD m_dwErrorCode; // error int rc = f2(); if (rc == 0) { // ... } else { // ...code that handles the error... } } int f2() { // ... Number sum = x + y; Number diff = x - y; Number prod = x * y; Number quot = x / y; // ... } catch (Number::Overflow& exception) {

However using return-codes forces "error propagation clutter" into all the functions in between those two. The trouble with return values are that choosing the error return value can require cleverness and can be impossible: double d = my_sqrt(-1); // return -1 in case of error if Contrast that with the version that used exceptions, which is almost self-documenting -- the basic functionality is very obvious. Subscribe to our monthly newsletter for tech news and trends Membership How it Works Gigs Live Careers Plans and Pricing For Business Become an Expert Resource Center About Us Who We

This is part of the discipline: you need to know when a condition should be reported via return-code and when it should be reported via an exception. Don't even think of that technique if you might have multiple threads accessing the global variable. What would be the atomic no. Given all this flexibility, how do you decide what to catch?

Adding numbers could cause overflow, dividing could cause divide-by-zero or underflow, etc. I was able to pick my datasource and my tables and everything, but i don't know how to access or write to them. In the real world, the code that detects a problem must typically propagate error information back to a different function that will handle the problem. It increases the bulk of the code.