C / C++ / MFC Discussion Boards

for c++ you should get Stroustrup & everything by Scott Myers & an STL book

Winsock its not a protocol its a library and there are plenty of sources of info on the web

For most protocols the doco will be language neutral. There is heaps and heaps of really good stuff on this site for windows socket programming and many many other thigns

For C++ I think www.cplusplus.com is good for you and for protocols I have this book and its good (Teach YourSelf MCSES TCP/IP in 14 days).

I have a device context handle HDC some thing drawing on it .
can i same the image that is drawing on device context using HDC handle only

Trioum

Do you want to show image with other draws?

Are you asking...

"I have an HDC that some other part of my program (eg a library) is drawing on.
With just that HDC information, can I save the picture?"

?

I can see a few barriers to saying Yes.

1/ I can't find any function called GetHDCSize (or equivalent), so you would have to select in a new BITMAP, and examine the old BITMAP for information, then select it back. But you have to do this in the same thread as the Thing that is drawing to the HDC.

2/ HDC's are normally temporary objects, given to a program from a central pool. How you got this HDC is important. If you simply stored a HDC returned from BeginPaint, then the HDC will be recycled by EndPaint, and it will no longer be valid. If you get GetDC (hWnd) yourself, then you will be working on a different HDC to the Thing you talked about earlier.

3/ I'm now running out of ideas, as any more answers depend on details you haven't told us (yet).

Good luck,

Iain.

Iain Clarke appearing by Special Request of ^CPallini.

May be this screencapture[^] + use of CImage Class is useful

if

trioum wrote:
can i save the image that is drawing on device context using HDC handle only

I changed a collection from a vector to a map

ie
std::vector<mytype>

is now

std::map<std::string, mytype>

now my question is how do I modify the following so that it will still work?

std::copy(collection.begin(), collection.end(), std::ostream_iterator<mytype>(anOStream));

Obviously I need to some how pass the pair::second to the third param but I dont know how. I realise I could just make it a loop but Im interested to know the answer

Thanks
Josh

modified on Tuesday, February 05, 2008 11:08:16 PM

Is it possible to have a child window with a title bar, and have the title bar active (i.e. highlighted just as a normal active window's title bar is)? I have tried to do this, even forcing focus for the child window, but the parent window remains the one whose title bar is highlighted. I realize that I could make an MDI application in which the childs of the MDI child window can have active title bars, but my application is not an MDI app.

Basically, I wish to have several windows constrained within one parent window. I have everything in place with the exception that the title bars of these child windows will not highlight. Any help is appreciated. Smile | :)

What window styles are you using when you create the child?

What happens if you include the WS_OVERLAPPED style?

Mark

Mark Salsbery
Microsoft MVP - Visual C++
Java | [Coffee]

here's a piece of code

HWND hWndChild;
hWndChild = CreateWindowEx(0, _T("EDIT"), _T("Test Window"),
WS_CHILDWINDOW | WS_CAPTION | WS_MAXIMIZE,
0, 100, 340, 220, hWnd, NULL, hInst, NULL);
ShowWindow(hWndChild, SW_SHOWDEFAULT);

Please click here to show sample parent/child window.

I have a program that allows the user to input variables into a program, perform some math on the variables, and then spit out the answer. However, if the user enters a string, rather than a number, the program skips the rest of the input sequence and goes straight to the math. I'm trying to avoid this using a try...catch statement. However, I cannot run any code to check the error, because as soon as the user presses enter, the rest of the input code is skipped, without allowing me to run any code to test it. Is there any way around this whithout simply telling the user to be careful and only enter numbers?

Klazen wrote:
Is there any way around this

Several options come to mind.

1) Re-read the material provided for your course
2) Ask your instructor for some guidance
3) Network with other students in your class
4) Drop the course and change your Major

led mike

Thanks for the sarcasm, but it's not an assignment. I'm simply trying to learn more about C++.

Also, just FYI, I'm still in high school. Haven't even chosen a major.

Klazen wrote:
but it's not an assignment. I'm simply trying to learn more about C++.

Also, just FYI, I'm still in high school.

How stupid of me not to know that! Roll eyes | :rolleyes:

led mike

Klazen wrote:
Is there any way around this whithout simply telling the user to be careful and only enter numbers?

int x;
std::cin >> x;

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

That's what I am doing (well actually, I've got "using namespace std" and the top of the file, so I don't have to write that all over the place.) But when I type "s", for instance, it skips the rest of the "cin" statements and moves on to the code after it.

Did you see this?

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

I'd recommend Stroustrup's book on C++ (title "The C++ Programming Language"), one of his first examples is a calculator which reads numbers and expressions from the input and shows one way to parse it and extract numbers, symbols, labels etc..

Peter
"Until the invention of the computer, the machine gun was the device that enabled humans to make the most mistakes in the smallest amount of time."

have a look at boost's lexical cast[^]

The underlying implementation uses string streams (which is pretty slow) so you could do something similar yourself if you dont want to use their library

something along the lines of this...

<br />
stringstream ss;<br />
string input;<br />
int value;<br />
<br />
try<br />
{<br />
   ss << input;<br />
   ss >> value;<br />
}<br />
catch(cant remember exactly what is thrown)<br />
{<br />
  //if you get here its not an int<br />
}

start everything out using a char varable

char number[100]

then us a static_cast<int>
to turn it in to a int if the user enters a charcter they going to get sumthing crazy but other then that you could use if or catch statements

Gregory Bryant wrote:
start everything out using a char varable

char number[100]

then us a static_cast
to turn it in to a int if the user enters a charcter they going to get sumthing crazy but other then that you could use if or catch statements

What ?? Are you kidding ? You mean you want to use a static_cast on the char array to convert it to an integer ? Oh man, that is just plain wrong.

Cédric Moonen
Software developer

Charting control [v1.2]

Please don't answer questions until you know the answers. This is just plain wrong on so many levels.

Christian Graus - Microsoft MVP - C++

"also I don't think "TranslateOneToTwoBillion OneHundredAndFortySevenMillion FourHundredAndEightyThreeThousand SixHundredAndFortySeven()" is a very good choice for a function name" - SpacixOne ( offering help to someone who really needed it ) ( spaces added for the benefit of people running at < 1280x1024 )

Hi,

I am just once again posting the question which I have posted a couple of days back. Of course, it hasn't attracted any member attention, but I am just posting again now with a hope that some members may respond. I assure you all that I don't bother and abuse this forum again by repeating the same question. Kindly understand.

Shanmukha

Hi,

I have a problem with one of my Doc-View Application. In fact, I am novice in doc-view apps. I have a CFormView based SDI app coded in Visual C++ 6.0 environment. The user interface has three modeless dialogs embedded in a CTabCtrl, One ChartCtrl and CListCtrl. I observed a funny behaviour while opening a stored document (not Word document) by double clicking on it. The view is not getting updated correctly. But if I open the the file by File-> Open command, every thing working fine.
Let me explain a bit about how I coded the app for better comprehension.
1. The document has a user defined class which handles the serialization on its own (based on Ravi Bhavnani code).

2. The List control paints its contents using NMCustomDraw feature.

3. By digging into the code I could find that OnNewDocument() function is not getting called while opening tha App from Shell (i.e. by double clicking on the file), instead the OnOpenDocument() is called. And all other Doc->DeleteContents() and Serailization, View->IntialUpdate() and View->OnUpdate() working OK but the List Control not getting updated.

4. But if you open the file by File ->Open command, since the SDI app gets started with a new document every thing looks OK.

5. Same is the case by opening with command line Start-> Run-> MyApp xyz.tnf .

6. I found even the OnCustomDraw() function getting called.

7. I then tried to get into the undocumented DocManager classes etc. but I couldn't get much help. Even opening file from the Shell, I find App gets one empty document. This I got confirmed with DocManager class other functions.

Finally what I could find is that, the View and Document connection in the low level framework is at fault.

I would be grateful for any help in this regard.

I remain,
Shanmukha

why the bellow code doesnt make CTreeCtrl lables trasparent?
the same method works fine for CListCtrl
SetBkMode() also if i uncomment it doesnt make lables trasparent
lables r painted with black color background instead of trasparent
butif i use any other color other than CLR_NONE or TRASPARENT .. it will paint with the color i used properly but doesnt work with trasparent.

help me plz

please some one give me solution

void CLeftPaneTreeCtrl::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
switch(pNMHDR->code)
{
case NM_CUSTOMDRAW:
{

LPNMTVCUSTOMDRAW lplvcd = (LPNMTVCUSTOMDRAW)pNMHDR;

//SetBkMode(lplvcd->nmcd.hdc,TRANSPARENT);
lplvcd->clrTextBk = CLR_NONE;

if(lplvcd->nmcd.dwDrawStage == CDDS_PREPAINT)
{
*pResult = CDRF_NOTIFYITEMDRAW;
return ;
}

if(lplvcd->nmcd.dwDrawStage == CDDS_ITEMPREPAINT)
{
*pResult = CDRF_NOTIFYPOSTPAINT;
return;
}
}
}

}

If you have a look through last week's postings on this forum, you will find a few questions about transparent tree controls, backgrounds and labels.

You can ignore the questions by George_George, so that will save you 50% of the effort.

(Just because he didn't ask it...)

Iain.

Iain Clarke appearing by Special Request of ^CPallini.