Just a few more things on top of what Victor said:
1. Typically the chaining structure comes before the payload (the data part). That allows you to have different sizes of objects in your list without having to modify the list management code.
2. Again in the typical case, the function that creates or extends the list (BuildList function in your example) receives a structure containing the list head and tail. That way you can easily add new elements at either end and this is the most common operation.
Below is the code I have for Drawing a Pie give a percentage thing is it looks nice and I traced a percent of 10.000 however calculation of x & y are negative and it ends up (the pie) being on the left side of the circle
Wondering if I am doing anything wrong after getting to 2 CPoints and I do a CDC:Pie
I have few questions about the above two items first for the EDITWORDBREAKPROCA if my edit control is part of CRicheditCtrl does the callback proc have to be a member of the Cricheditctrl
or can it be like my STEAMIN function
if the callback is a class member how would you code the sendmessage when I code CrichEditctrl->Sendmessage(EM_SETWORDBREAKPROC,0,(LPARAM) &CStroage::editworbreak) I get complier messages saying invalid type conversion
Next do I need a message map entry for EM_EDITWORDPBREAKPROC such as ON_MESSAGE(EM_EDITWORDBREAKPROC,&CStroage::editwordbreak) if so there is a problem with this because the ON_MESSAGE takes a LRESULT MEMBERX (wparam, lparam) not the paraamter of the call back
in the Call back if I want to line break 0n 0x0a0d
then the code would be the following the doc is not that stright forward thanks in advance for anyone who helps me clarify
if (lpszEditText[ichCurrent] == 0x0a0d)
This "header" to you're lengthy on-going (no sarcasm here ... I too use MS VS) battle with AFX/MFC uses Rich Edit 2.0? And that is why there's no EditWordBreakProcEx and you're usg EditWordBreakProc "in support of passing UNICODE" (from the docs)?
1. No, the callback method is a function in your application, and nothing to do with the control. Information between the two is passed via the system.
2. As far as I can see there is no such message as EM_EDITWORDPBREAKPROC so no, you do not add it to the message map. And if you think about it, that would not make sense. Once you register your callback with the system the edit control will call it automatically whenever the specific conditions trigger the event.
3. Callback methods need their address to be computed at build time. So if it is a class member it needs to be a static method.
4. In the line
if (lpszEditText[ichCurrent] == 0x0a0d)
you are looking for the two characters, but that may not be correct. You should use the debugger to check exactly what character(s) are being pointed at.
storagepointer->SendMessage(EM_SETWORDBREAKPROC, 0, (LPARAM)(EDITWORDBREAKPROC)EditWordBreakProc);
long numstream = storagepointer->StreamIn(SF_TEXT,STORAGESTREAM);
this is the callback
int CALLBACK EditWordBreakProc(LPTSTR lpszEditText, int ichCurrent, int cchEditText, int code)
char FAR* lpCurrentChar;
I have the call back declared all the way at the begining of my .cpp file I made a breakpoint at entry of the call back and it never got control
I tried the SendMessage with a &EditWordBreakProc and also tried the sendmessage after the streamin
int CALLBACK EditWordBreakProc(LPTSTR lpszEditText, int ichCurrent, int cchEditText, int code);
I have created a similar test (although not MFC), and it appears to work. Remember that the callback will not get called until the edit control is trying to reformat some text to fit in the window. I tested mine just by dragging the right hand edge to make the window narrower. As soon as a word needed to be broken, the callback got actioned.
I do not think that is what you need. The EDITWORDBREAKPROC function is only called at the point where the control needs to decide whether to split a word or not. Searching for line break characters is a different issue and will depend on exactly how you are trying to reformat it.
I have to think if there is a way to drive the callback proc before I display the data let me explain the data is in the following format
2E000 XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX * * from the 2E000 till the first * is hex data in printable format so O know for sure there is no any 0x0a x0d or x0c line feed between the two * there might be
I am just trying to think if there is a way of drving the callback as from what I understand it gives the user the ability to decide when to line break need to think about it
But as I mentioned above, the callback is only actioned when the control is trying to update the display, and a word cannot fit in the existing space. If you do not register a callback then the control will use spaces between words and existing line break sequences.
Your issue quite different as far as I understand it, but it is not clear what you are trying to achieve in your text display.
I am trying to display storage from my Z/os Server in the following format a 32 bit address in printable format which is 8 bytes then 16 bytes of storage in printable format 4 groups 4 bytes separated by spaces then within * * the raw hex data at this point i would like to line break
I have to look at the streamin says
The control calls the callback function repeatedly, transferring a portion of the data with each call.