C / C++ / MFC

Re: number of decimals in integer

30-Mar-03 6:02

Subtle, dude Cool | :cool:

Software Zen: delete this;

Gary R. Wheeler30-Mar-03 5:59

MFC Print Preview - help urgently

30-Mar-03 5:59

int CountDigits(int value)
{
    int digit_count = 0;

    do {
        digit_count++;
        value /= 10;
    } while (value != 0) {

    return digit_count;
}

or, even faster:

int CountDigitsFaster(int value)
{
    int digit_count = 1;
    if (value < 0) value = -value;
    if (value > 9) digit_count++;
    if (value > 99) digit_count++;
    if (value > 999) digit_count++;
    if (value > 9999) digit_count++;
    if (value > 99999) digit_count++;
    if (value > 999999) digit_count++;
    if (value > 9999999) digit_count++;
    if (value > 99999999) digit_count++;
    if (value > 999999999) digit_count++;
    return digit_count;
}

Note that CountDigitsFaster assumes that int's are 32-bit signed values. Both functions assume that the minus sign in negative values is not considered a 'digit'. If you're actually trying to compute the number of characters required to display the value, then you would have to take that into account as well. CountDigitsFaster looks like dumb code, but is significantly faster than any alternative I can think of. It requires 10 compares, 10 jumps, possibly a negation, and up to 9 increments. My original CountDigits, while it may exit with an early out for small values, requires an increment and a division per iteration, for up to 9 iterations.

Software Zen: delete this;

Performance Counter

Luis Ricardo29-Mar-03 7:48

Luis Ricardo

29-Mar-03 7:48

I would like to see examples in VC6 about performance counter ( creating new performance counter)

Thanks Big Grin | :-D

Luis Ricardo

Re: Performance Counter

Erik Juhl31-Mar-03 5:03

Erik Juhl

31-Mar-03 5:03

The best examples I could find were in MSJ from August 98, written by Jeffery Richter. This is what I used as a basis for adding performance monitors to my services. Here is the URL from MSDN: http://www.microsoft.com/msj/defaultframe.asp?page=/msj/0898/performance.htm&nav=/msj/0898/newnav.htm[^]

Re: Performance Counter

Luis Ricardo31-Mar-03 11:54

Luis Ricardo

31-Mar-03 11:54

Thanks...;P

Re: Performance Counter

jagadeesh_skm18-Mar-10 18:58

jagadeesh_skm

18-Mar-10 18:58

The link u hv provided is not working. Do u know any other links?

Nehal Kanani29-Mar-03 7:47

Nehal Kanani

29-Mar-03 7:47

MFC Print Preview - help urgently
Helpp!!! I printed a few pages using CView::OnDraw override, hence, did not take into consideration the current page being printed. So the problem is that I do not print taking into consideration the current page being printed. As a result, the output gets slower when the data to be printed increases and even overlapped. Please Help!!!!

MDI, CFormView1 open CFormView2, How ?

jensreichert29-Mar-03 7:12

jensreichert

29-Mar-03 7:12

Hello,

how can I open another FormView in a MDI-Appl. from a FormView ? Not from the Main-Menu !
Example:
There is a Button in CFormView1. With this Button, I
want to open/create the CFormView2. How can I do that ?

Is there a axample application/source?

Thanks, jr

Re: MDI, CFormView1 open CFormView2, How ?

Brian Shifrin29-Mar-03 14:51

Brian Shifrin

29-Mar-03 14:51

// Get the correct document template
CDocTemplate* pDocTemplate;
POSITION pos = pApp->GetFirstDocTemplatePosition();
pDocTemplate = pApp->GetNextDocTemplate(pos);
ASSERT(pDocTemplate);

// Create the new frame
CFrameWnd* pNewFrame = pDocTemplate->CreateNewFrame(GetDocument(),
(CFrameWnd*)AfxGetMainWnd());
ASSERT(pNewFrame);

// Activate the frame and set its active view
pDocTemplate->InitialUpdateFrame(pNewFrame, NULL);

MDI, CFormView1(with Doc-Class) open CFormView2 (without Doc-Class), How ?

jensreichert29-Mar-03 20:04

jensreichert

29-Mar-03 20:04

How can I open the CFormView2 , which have no Doc-Class ?

Thanks, jr

Which API's do i need to get the hWnd of the control under the cursor?

Redeemer-dk29-Mar-03 6:57

Redeemer-dk

29-Mar-03 6:57

I'm making a program where i need the hWnd of the control that is currently under the cursor, but i'm in doubt of which API's i should use. I've tried checking around but i can't seem to find the answer.

Thanks in advance

Re: Which API's do i need to get the hWnd of the control under the cursor?

PJ Arends29-Mar-03 9:40

PJ Arends

29-Mar-03 9:40

WindowFromPoint() or possibly ChildWindowFromPoint()

Sonork 100.11743 Chicken Little

"You're obviously a superstar." - Christian Graus about me - 12 Feb '03

Within you lies the power for good - Use it!

Re: Which API's do i need to get the hWnd of the control under the cursor?

John R. Shaw29-Mar-03 10:36

John R. Shaw

29-Mar-03 10:36

You might want search MSDN there is an old sample program on using DIBs. What the program does is allow you to move the cursor over a window a capture it to a DIB. If you search for a screen/windows capture program here or on the web you should be able to find additional examples.

Trust in the code Luke. Yea right!

CListCtrl and ImageList

JamesLaing29-Mar-03 5:33

29-Mar-03 5:33

Why does the colour black get displayed transparently in a CListCtrl given an associated imagelist.
How do I preserve the black colour .. ?

Thanks in advance.

Gary R. Wheeler29-Mar-03 5:49

29-Mar-03 5:49

Depending upon how you create the image list, the color black can be used as a mask value. Pixels in the bitmaps that are the mask color are displayed as transparent.

The easiest way to handle transparency with an image list is to use icons, rather than ordinary bitmaps.

Software Zen: delete this;

JamesLaing29-Mar-03 5:57

29-Mar-03 5:57

Thanks Gary for the reply.

So, how do I specify a different mask colour other than black so that the black can be preserved.
The imagelist that I am using works just fine with the rest of the application and yes it is constructed from a bitmap.

Thanks.

RobJones29-Mar-03 6:46

RobJones

29-Mar-03 6:46

What I do is color the "Transparent" part of the bitmap to a purple/pinkish color and set the mask to that color.. like this..

CImageList imageList;
CBitmap bitmap;

bitmap.LoadBitmap(IDB_TOOLBAR);
imageList.Create(26, 26, ILC_COLORDDB|ILC_MASK, 0, 0);
imageList.Add(&bitmap, RGB(255,0,255)); // PURPLE COLOR

Rob..

Whoever said nothing's impossible never tried slamming a revolving door!

JamesLaing29-Mar-03 8:47

29-Mar-03 8:47

Thanks for the reply.

Thanks for the suggestion, but my problem does not involve transparent areas of the source bitmap but the default drawing of any black pixels transparently.

I already have an Imagelist defined for use in the application and I use a temporary DC to draw to prior to using the TransparentBlt function for transparent rendering.

My question is how do I honour the black pixels in the bitmaps when providing an ImageList for a CListCtrl using the .SetImageList function. When the images are displayed in the list, the black pixels are rendered transparently.
How do I prevent or circumvent this ?

Thanks in advance.

Gary R. Wheeler29-Mar-03 13:40

29-Mar-03 13:40

If you choose another color as the mask color (purple = RGB(255,0,255) in the example earlier in the thread), then that color is treated as transparent, and black is just another color in the bitmap. This is the standard behavior regarding the list control and imagelists.

You mentioned using TransparentBlt. From the MSDN:

BOOL TransparentBlt(
  HDC hdcDest,        // handle to destination DC
  int nXOriginDest,   // x-coord of destination upper-left corner
  int nYOriginDest,   // y-coord of destination upper-left corner
  int nWidthDest,     // width of destination rectangle
  int hHeightDest,    // height of destination rectangle
  HDC hdcSrc,         // handle to source DC
  int nXOriginSrc,    // x-coord of source upper-left corner
  int nYOriginSrc,    // y-coord of source upper-left corner
  int nWidthSrc,      // width of source rectangle
  int nHeightSrc,     // height of source rectangle
  UINT crTransparent  // color to make transparent
);

<listing>Parameters
...
crTransparent 
[in] The RGB color in the source bitmap to treat as transparent.</listing>

In this case, you would need to pass cdTransparent as whatever color you were using as the transparency color (again, RGB(255,0,255) from the example).

Software Zen: delete this;

JamesLaing29-Mar-03 23:33