Check box next to selected menu items - C / C++ / MFC Discussion Boards

PJ Arends21-Nov-05 12:11

21-Nov-05 12:11

I usually do the second one (strlen). To me it is more obvious that I am checking to see if the length of the string is zero. The last method will save you a couple CPU cycles, but it is not as obvious what you are doing IMO.

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Re: Testing for empty C-Style string...

Blake Miller22-Nov-05 4:25

Blake Miller

22-Nov-05 4:25

Thanks for your reply.

I agree, the strlen could be a performance hit, but more understandable.

Re: Testing for empty C-Style string...

toxcct21-Nov-05 22:22

toxcct

21-Nov-05 22:22

even if the 3 ones give the same result, it depends if lisibility is more important than performance...

i prefer using strlen() == 0 because the one who read back my code directly understand what i do there...

anyway, PJ Arends' answer is very good too Wink | ;)

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-- modified at 4:24 Tuesday 22nd November, 2005

Re: Testing for empty C-Style string...

Owner drawn22-Nov-05 1:11

Owner drawn

22-Nov-05 1:11

Blake Miller wrote:
if( !szString[0] )

This one's better if and only if you wrap it inside a function called

BOOL IsEmpty(char *str)
{
return !str[0];
}

Hey the function name can change Laugh | :laugh:

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Re: Testing for empty C-Style string...

wboncal22-Nov-05 7:59

wboncal

22-Nov-05 7:59

I would just cut the string into 1 foot sements so I can easily see both ends. If there is nothing on either end, and no clothespins are clipped in the middle it's an empty see style string.

Walter J. Boncal

How to print content of a CRichEditCtrl to a Rect

AnTri21-Nov-05 9:43

AnTri

21-Nov-05 9:43

Hey,

how can I manage to print the content of a CRichEditCtrl or a CString containing a rtf-text to an pDC (screen or printer).

Thank you for helping me...

Re: How to print content of a CRichEditCtrl to a Rect

Aamir Butt21-Nov-05 21:21

Aamir Butt

21-Nov-05 21:21

pDC->DrawText will simply paint normal text on the screen but since you are using rtf-text which means that there can be a lot of things in it, therefore, you have to parse the text first somehow and then paint the things one-by-one. I am sure there will be some libraries which do this. Search here on codeproject.

Regards,
Aamir

Check box next to selected menu items

NYTSX21-Nov-05 9:05

NYTSX

21-Nov-05 9:05

Hello,

I have a dialog app with a menu that allows the user to bring up different windows as they wish. I remember seeing a tutorial/article that had an easy way of placing a check mark next to the menu option that was already selected. (Essentially having the window being displayed already)

Can someone point me to this article.

Currently I am using this code that I had copied way back when(It dies on the first line, even though it works on my older app):

void CMyDialog::CheckMenu(int checked) <br />
{<br />
	CMenu* pMainMenu = GetParent()->GetMenu();<br />
	<br />
	// the menu position in the menu<br />
	CMenu* pSubmenu = pMainMenu->GetSubMenu(2);<br />
		<br />
	// vertical item position<br />
	UINT g = pSubmenu->GetMenuItemID(1); <br />
	<br />
	CString mnustr;<br />
	<br />
	pSubmenu->GetMenuString(1, mnustr, MF_BYPOSITION); <br />
	<br />
<br />
	if (checked) <br />
		pSubmenu->ModifyMenu(1, MF_BYPOSITION | MF_STRING | MF_CHECKED, g, mnustr);<br />
	else <br />
		pSubmenu->ModifyMenu(1, MF_BYPOSITION | MF_STRING | MF_DISABLED, g, mnustr);<br />
}

Thanks!

-- modified at 15:06 Monday 21st November, 2005

Re: Check box next to selected menu items

Maximilien21-Nov-05 9:24

Maximilien

21-Nov-05 9:24

NYTSX wrote:
CMenu* pMainMenu = GetParent()->GetMenu();

What does GetParent returns ?

is your application a normal MDI/SDI application ? or is it dialog based ?

If it's the former, you will need to add a handler for the ON_UPDATE_COMMAND_UI and do something like

void CMainFrame::OnMyHandle( CCmdUI* pCmdUI ) 
{
  pCmdUI->SetCheck( checked  ); // checked is set by you.
}

Maximilien Lincourt
Your Head A Splode - Strong Bad

Re: Check box next to selected menu items

NYTSX21-Nov-05 9:30

NYTSX

21-Nov-05 9:30

GetParent throws the error "unhandle exception. Access violation"

This is a dialog based app. The code that I am currently using is from a MDI app that I just called the method with no problems.

Thanks for your help

-- modified at 15:31 Monday 21st November, 2005

Re: Check box next to selected menu items

NYTSX22-Nov-05 1:53

NYTSX

22-Nov-05 1:53

Can anyone help with this? The code I got this from was from a MDI app....but I don't know the changes I need to make to get it to work in a dialog app.

I think the problem is that I am having a problem getting the handle to the menu itself.

The scenario is that I have a main dialog who owns the menu (or so I think) which in turn will instantiate another dialog.

Thanks for your help.

Debugging DLL problem

Bob Stanneveld21-Nov-05 7:57

Bob Stanneveld

21-Nov-05 7:57

Hello,

I've got a little problem when I want to debug my DLL. The situation is as follows:
- I've a DLL project and I've buildt a debug version of the DLL with the
PDB file.

- I've another project and I want to test the DLL by calling it's functions
with predefined data. When I hit a application breakpoint, I want to step
into the DLL's code.

- The DLL and the PDB are in the same folder as the test application.

The problem is that VS2005 says that no debug symbols are loaded for the DLL. Is there a way to load those symbols manually, or am I doing something wrong?

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Re: Debugging DLL problem

douglasjordan21-Nov-05 8:13

douglasjordan

21-Nov-05 8:13

I have not done any DLL debugging with VS2005 yet, however in the past to get a DLL to step debug I had to start the debugger from the DLL project specifying the EXE that will load the DLL. If you cannot get the EXE to stop at the point you wish, just put an "_asm int 3h" inline and the debugger will stop. If its a debug build it should automatically pull in the source.

Re: Debugging DLL problem

Bob Stanneveld21-Nov-05 9:16

Bob Stanneveld

21-Nov-05 9:16

Hello,

Thanks for your reply. I think that MS changed the way the DLL's are debugged. I can't get the source, even with the __asm int 3 jump in the debugger hack...

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Re: Debugging DLL problem

Chris Meech21-Nov-05 8:22

Chris Meech

21-Nov-05 8:22

Bob Stanneveld wrote:
The DLL and the PDB are in the same folder as the test application.

Are they in the directory for the test applications project or are they located in the Debug sub-directory? If I remember correctly they should be in the Debug sub-directory.

Chris Meech

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Re: Debugging DLL problem

Bob Stanneveld21-Nov-05 9:18

Bob Stanneveld

21-Nov-05 9:18

Hello,

The DLL, PDB file and the test application are all in the same directory, but to no avail... The debug output shows that the symbols are loaded however.. Confused | :confused:

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Re: Debugging DLL problem

C^hris L^osinger21-Nov-05 8:26

C^hris L^osinger

21-Nov-05 8:26

there are two ways i handle this:

1. put the DLL project into the same solution/workspace as your app, build the DLL and the app. then the debugger will know how to find the DLL source.

or

2. in your DLL project, set your test app as the startup EXE . then when you 'run' the DLL, it will start the test app, and you can put breakpoints in the DLL (but not in the test app).

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Re: Debugging DLL problem

Bob Stanneveld21-Nov-05 9:20

Bob Stanneveld

21-Nov-05 9:20

Hello,

Thanks for your reply. Big Grin | :-D

Chris Losinger wrote:
1. put the DLL project into the same solution/workspace as your app, build the DLL and the app. then the debugger will know how to find the DLL source.

The projects are all in the same solution. I even pointed the target directory of the GUI test app to the general debug folder where VS puts all the libraries.

Chris Losinger wrote:
2. in your DLL project, set your test app as the startup EXE . then when you 'run' the DLL, it will start the test app, and you can put breakpoints in the DLL (but not in the test app).

I also did this, but it didn't work. Is this a missing feature in the standard edition?

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Re: Debugging DLL problem

C^hris L^osinger21-Nov-05 9:27

C^hris L^osinger

21-Nov-05 9:27

could be a vs05 issue, but since i've never used vs05, i can't say...

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Re: Debugging DLL problem

Bob Stanneveld21-Nov-05 9:38

Bob Stanneveld

21-Nov-05 9:38

I think that it's a missing feature in the standard edition. I think that the content of the debug output window is the output of dr watson. This output says that the debug symbols are loaded, but when I hold the cursor above the DLL breakpoint, the tooltip says that there are no symbols loaded. Confused | :confused:

I have to verify this somehow.

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LRU & FIFO

Jeannie Brown21-Nov-05 6:01

Jeannie Brown

21-Nov-05 6:01

I am a student majoring in computer science. I have a senior project that I am trying to complete.. and I am looking for help... I have to put together a project that Counts the number of page faults during Least Recently Used and Firt In First out.. I am not sure how to implement those two together to count the page faults... there is no set pages so I created a data file for a sample test.. I have some code for LRU but it's not what my teacher wants.. could anyone help me combine those algorithm if's it's possible. otherwise I will have to do them individually. I am looking for some starting point.. Confused | :confused:

Re: LRU &amp; FIFO

toxcct21-Nov-05 6:21

toxcct

21-Nov-05 6:21

standard C++ have a big template library which already implements these two concepts...

see the MSDN for STL containers[^]...

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Can I call a DLL which was created from VB.net?

ATC21-Nov-05 5:01

ATC

21-Nov-05 5:01

Hi,

I have a DLL which was created from VB.net and it works very well with a VB application that using it!

I wonder that can I call and use it from VC++ 6.0 (professional Edition)? I did check some tips to call a DLL ... however, otfen it shows how to use a DLL that created from an MFC (using .dll & .lib)

*) I verify the DLL that created from VB.net, it has the .dll but does not have the .lib ... so I could not try these recommended methods

It is desperate request, does anyone know how to do it?

Many thanks

-- modified at 11:03 Monday 21st November, 2005

Re: Can I call a DLL which was created from VB.net?

toxcct21-Nov-05 5:08

toxcct

21-Nov-05 5:08

you can't do it within VC++ 6 as it is not Managed C++...

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[toxcct][VisualCalc]

Re: Can I call a DLL which was created from VB.net?

ATC21-Nov-05 7:36

ATC

21-Nov-05 7:36

You are right!

Thanks

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