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Hi
I want to limit the number of characters on a line in a multiline edit control
I figured I would do CEdit::linelength and divide that by rect.right
From getclientrect that would get me the number of pixels per character
I would then multiply it by the number of characters I want on a line however
Cedit:Linelength return zero
my edit control is declared CEdit mycontrol
I know under the covers it does a SendMessage EM_LINELENGTH
Is there a issue that I dont have a message map
The character index is 0
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Did you pass a valid line number to it like 0? If you pass it -1 "the return value is the number of unselected characters in the lines that contain selected characters" according to the documentation.
You will have to do the length limiting of each line yourself because LimitText and SetLimitText define how many total characters the control can accept, not just on one line.
Also, to get the number of pixels per character you should call GetTextExtent which is a member of the CDC class. The typical way is to generate a string with all upper and lower case letters, call GetTextExtent with that string, and then divide the resulting width by the string length to get an average for each character. There are lots of examples that show how to do this.
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I did pass 0 is the index and still it returned 0
I do use The GetTextExtent but thought that LineLength would be easier
This is the code I used to figured out how much space I needed per line I was looking to allow the user up to 8 hex characters (by that I mean 0 -F )
It just didn't come up exactly the way I figured
CSize mycsize = gprdc->GetTextExtent(_T("0123456789ABCDEF"), 16);
mycsize.cx = mycsize.cx / 16;
RECT gprrect, gprrect1, accessrect;
WINDOWINFO dlgwin;
GetWindowInfo(&dlgwin);
asidgprs.GetWindowRect(&gprrect);
asidaccess.GetWindowRect(&accessrect);
int height = gprrect.bottom - gprrect.top;
gprrect.left = (gprrect.left - dlgwin.rcWindow.left) + dlgwin.cxWindowBorders;
accessrect.left = (accessrect.left - dlgwin.rcWindow.left) + dlgwin.cxWindowBorders;
gprrect.top = gprrect.top - ( dlgwin.rcWindow.top + dlgwin.cyWindowBorders + 20) ;
accessrect.top = accessrect.top - ( dlgwin.rcWindow.top + dlgwin.cyWindowBorders + 20);
gprrect.bottom = ( gprrect.top + height) -20 ;
accessrect.bottom = (accessrect.top + height) - 20;
gprrect.right = gprrect.left + (mycsize.cx * 10);
accessrect.right = accessrect.left + (mycsize.cx * 10);
mycsize.cx represents the number of pixels per character originally I multiplied by 8 figuring 8 characters per line but I ended up multiplying by 10 to get 8 characters to fit
asidgprs and asidacess are 2 multiline edit controls in the Dialog
I ended doing a lot tweeking wit this to get it to the right size
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Is there a reason you need to use multi-line edit controls of a fixed width? It seems like an array of single line edit controls might do what you need and it is easier to limit the length of data in them.
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If they are all adjacent to each other they look like multi line ?
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This message returns the length of the existing text at that line, not the amount of space available. How many characters are in the control when you call this?
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Thanks that’s it I wanted to calculate the number of characters the control can hold on a line
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ForNow wrote: I wanted to calculate the number of characters the control can hold on a line
It depends on the font your control is currently using.
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If your current font is a "proportional" one (like Arial, Times New, ...) then it is not possible to calculate the number of characters in a line in a common case.
It will always depend of the text itself. Example:
the text "WWW" needs much more pixels than "111".
But for non-proportional fonts (like Courier New) both need the same number of pixels.
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I understand that this is the font statement from resource file dialog definition "FONT 8, "MS Shell Dlg", 400, 0, 0x1" I basically editing for hex characters so my GetTTextExtent string is "0123456789ABCDEF" these characters seem like the size even without a Font like courier new
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That's a proportional font, a 1 will take far less space than an E. If spacing is important then you should use a fixed font in your edit control.
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Have you considered deriving your own class from CEdit, something like:
class MyCustomEdit : public CEdit
{
}Then as each character is typed into the control but before the control is updated, figure out what line the cursor is on (I haven't used MFC in a few years so I'm not sure what these two messages would be). If there is room, let the character through, otherwise not.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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probably WM_CHAR and wparam is the keystroke truth that would also save me time on the editing as I can see if it is a valid hex character was entered rather then do GetWindowText to read the entire control
Thanks
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This class may provide all the functionality of a DDV macro
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HI,
I'm updating my C++ application in to multi thread application in VisualStudio 2013.
In main(), thread's was created by CreateThread()and inside the thread's classA ObjA(); was created & called the function.
In the classA it call another dll method.
Dll was include in to the project through properties->Linker.
Problem was when objA called dll method , application throws access violation reading location.
But without multi-thread it works normal.
Accessing dll method from multi-thread is same way as normal or any other things needed for accessing.
Thanks in Advance.
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You need to use the debugger to check exactly what caused the access violation. Are you sure the DLL is totally thread-safe?
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What is a type of your project?
What is a type of a DLL?
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I perform some experiments with the cpp code and I got -nan values. Can anybody tell why I might get these values
modified 29-Jan-21 21:01pm.
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Because the math operations performed by your code result in a NaN?
You cast an integer with at least the relevant most signficant bits set to float or double?
You have a buffer overflow writing such a value to the memory of a float or double?
Without seeing code, we can't tell you for sure.
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2 most likely reasons:
Invalid math e.g. division by zero, or use of uninitialized variables. Without seeing your code, and input, we can't know.
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ahem... Division by zero in general produces a (signed) Inf, not a NaN.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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Because what ever you are doing, the result is not a number.
"One man's wage rise is another man's price increase." - Harold Wilson
"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons
"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles
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Hi
I have some questions regarding storage allocations. I know there is default heap value every exe or DLL gets. You can make that bigger or smaller /HEAP
I am guessing this is where the "new" operator gets storage.
using GetProcessHeap gets storage from this heap
If I don't want to bump heads with that I do a HeapAlloc initially the three paramters all zeros
But I "THINK" even if I do a HeapAlloc for 20 byes it really gets 1K
if I see that during my processing I need more I do a HeapRealloc using the same pointer for return value and 1st parameter I get more storage
I don't know if this better than using new
would anyone have any input ?
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