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Hi all,
I need to know what is the future of COM in the presence of .Net architecture. Will COM survive or not? I need to know it so that I put my learning efforts in right directions.
Thanks for all those who ll take some time to answer this question.
Regards
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Learn COM first. Once you know COM, .NET is easy.
It is similar to learning C and C++. Other high-level languages including Java, C#, VB, etc. are simple.
Kuphryn
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kuphryn wrote:
Learn COM first. Once you know COM, .NET is easy.
I am learning COM these days. I am learning it from 2 books.
1. Inside COM
2. Inside ATL
I have not developed any COM server yet. As I am reading "Inside ATL" and other stuff on COM on web, I foung that this path will lead to MTS (Microsoft Transaction Server) programming. (I dont know whether i m right or wrong, it is only my guess.)
The thing i need to know is whether COM is alive in today world. i.e. are new projects being implemented using COM or .Net has obsoleted COM since .Net's component model is much simpler.
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It's hard to tell. .NET is still young.
Kuphryn
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Hey everyone,
Since I started studing MFC I am starting to read alot on UNICODE. I read a few pages in my book about it and I also read an article on this site about it. I understand the conscept, I am just not sure on if I should use it and how to use it. Is there a library that chances everything into Unicode at compile time or do I have to change all my variables to unicode?
Thanks for your help!
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When working in MFC applications and your not sure whether you will need UNICODE or not, you just need to be carful in your string handling. Declare characters etc using the TCHAT type. This will resolve to either char or wchar depending on whether you have UNICODE defined. This will make all your types switch automatically.
After that, your big concern will be string manipulation functions. strlen() etc. They all have an equivalent beginning with _tcs which resolves to either the ANSI or UNICODE versions of the functions depending on the UNICODE define.
The MFC CString class is automatically UNICODE complaint if your build for UNICODE.
Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...
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Is the UNICODE only when dealing with strings and char? What kind of concerns will I have when I am manipulating strings? Is there functions like strlen() designed for UNICODE? Is this a good practice to get into when coding in MFC and is there a library I have to use?
Thanks for your all of your help!!
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For the manipulation you use the equivalent _tcs... version of the function.
If your have MSDN, just type _tcs... into the index option and it will give you a list of all the vaailable functions. There should be an equivalent for all the standard C runtime string functions.
e.g. strlen -> _tcslen
strcpy -> _tcscpy
Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...
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The string functions are the only ones I am going to have to worry about correct?? If I am going to start to write a piece of software would you advise to use the UNICODE instead of regular char? That is all I have to worry about correct, just strings??!
Again did you mention anything about a include file for UNICODE?
I caught that type and just figured it was TCHAR.
Thanks Roger, you have been a great help!!!!!!!! Just as everyone else at this site!!
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BrockVnm wrote:
If I am going to start to write a piece of software would you advise to use the UNICODE instead of regular char?
If you are positive that your application is not going to be used in an environment that uses double-byte characters, then using char types and the related strxxx() functions is fine. However, using TCHAR types, and the related _tcsxxx() functions does not cost any extra as the preprocessor resolves them accordingly.
A rich person is not the one who has the most, but the one that needs the least.
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I spotted it just as I hit submit
Buts whats more annoying is that I had gone and tried to fix it once already and typed in the same mistake again! 
Roger Allen - Sonork 100.10016
Roger Wright: Remember to buckle up, please, and encourage your friends to do the same. It's not just about saving your life, but saving the quality of life for those you may leave behind...
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If there's one thing I hate more than making typos in replies is having some moron pointing out the bleedin' obvious. 
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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In addition to Roger's good summary, you should also wrap any string constants with the _T() macro.
A rich person is not the one who has the most, but the one that needs the least.
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would you type the _T with any function that you are using that UNICODE variable with. What kind of enviornments would I need UNICODE for....i.e. windows xp, etc. Or is this something that I would use if I was gonna try and use the software on linux, unix, windows, etc???
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BrockVnm wrote:
would you type the _T with any function that you are using that UNICODE variable with.
The _T() macro is for string constants and is only used when _UNICODE is defined. Otherwise it is removed by the preprocessor.
BrockVnm wrote:
What kind of enviornments would I need UNICODE for...
Japanese Kanji or Korean Hangul are two examples.
A rich person is not the one who has the most, but the one that needs the least.
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Ok, they are used if you want to use other languages!!! So if I am not going to support other languages I will be ok. Thanks David!
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BrockVnm wrote:
Ok, they are used if you want to use other languages!!! So if I am not going to support other languages I will be ok.
Of course.
A rich person is not the one who has the most, but the one that needs the least.
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Is this discussions and tips holds true for Win32 Applications?
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Dear MFC Gurus!
I'm writting SDI-based application that has DialogBar with combobox control. This DialogBar is initialized as the follows:
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
...
if (!m_Bar.Create(this,IDD_BARDLG,CBRS_TOP,ID_MYBARDLG)) {
AfxMessageBox(_T("Failed to create dialog bar!"),MB_ICONSTOP);
return -1;
};
};
where m_Bar is CDialogBar. IDD_BARDLG doesn't have its class derived from CDialog!
How to capture ON_CBN_SELCHANGE message in CMainFrame class from combobox control belonging m_Bar? In other words, I need to track changing the selection of combobox. What should I do?
Yours sincerely,
Alex Bash
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Trap it in your dialog bar. Then, post a command (eg: CMD_CHECK_COMBO) to the mainframe that causes it (the mainframe) to check the selection of the combo.
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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What is "trap"? I'm not sure about terminology...
Yours sincerely,
Alex Bash
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What I meant was write a handler for the CBN_SELCHANGE notification.
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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I've got a custom control that I am implementing that behaves much like a combo box. When the user clicks the down arrow button, an new window is displayed that presents a Color Selector much like the one in MS Office. I've based the code loosely on articles found here on CodeGuru, with modifications for my specific requirements. Now I've got everything working fine but one that that is causing me trouble is that when the Color selection drop down is shown the control gets a killfocus message. I don't really want a
kill focus message to go out since my control hasn't really lost focus, its just given it to is dropdown window.
Looking at SPY I see that the normal combo box doesn't send out a kill focus when the dropdown is opened so there must be a way to trap the message.
Does anyone know how I can keep my Control from sending a kill focus when the Dropdown window is shown?
My class is derived from CButton.
Thanks
Timothy Bish
tabish[at]twcny.rr.com
timothy.a.bish[at]lmco.com
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tabish121 wrote:
Does anyone know how I can keep my Control from sending a kill focus when the Dropdown window is shown?
I don't think you can prevent this. But your control could just ignore the WM_KILLFOCUS (or at least handle it differently) if the color selector window is being displayed.
/ravi
My new year's resolution: 2048 x 1536
Home | Articles | Freeware | Music
ravib@ravib.com
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