Grayscale Image Display - C / C++ / MFC Discussion Boards

qqworm2-Jun-05 2:37

2-Jun-05 2:37

Today is "2005-6-2", if I add 100 days to it, the day is...? I don't known how to calculate it. for help, thanks.

qqworm

Re: how to calculate the Date? thanks

Cedric Moonen2-Jun-05 2:41

Cedric Moonen

2-Jun-05 2:41

If you use MFC, you can use the CTime and CTimeSpan classes, they will allow you to do exactly what you are looking for.

Re: how to calculate the Date? thanks

qqworm2-Jun-05 3:08

qqworm

2-Jun-05 3:08

Thanks. Can I spare you some time? What should I do to find the simplest way?

qqworm

Re: how to calculate the Date? thanks

Cedric Moonen2-Jun-05 3:22

Cedric Moonen

2-Jun-05 3:22

qqworm wrote:
Today is "2005-6-2", if I add 100 days to it

Something like:

CTime Time(2005,6,2,0,0,0);  // Look in the doc for the "daylight savings time" that you want to use
CTimeSpan Span(100,0,0,0);

CTime NewTime = Time + Span;  // NewTime will hold the time you are looking for

[EDIT] I don't use that very often so you have to check if that works, it was just for information... [/EDIT]

Re: how to calculate the Date? thanks

qqworm2-Jun-05 4:37

qqworm

2-Jun-05 4:37

Thanks a lot.

qqworm

Re: how to calculate the Date? thanks

ThatsAlok2-Jun-05 18:46

ThatsAlok

2-Jun-05 18:46

cedric moonen wrote:
CTime Time(2005,6,2,0,0,0); // Look in the doc for the "daylight savings time" that you want to useCTimeSpan Span(100,0,0,0);CTime NewTime = Time + Span; // NewTime will hold the time you are looking for

Cool, even i don't know that Smile | :)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Problem with ListCtrl while using Manifest file for XP Look

Neeranjan2-Jun-05 1:29

Neeranjan

2-Jun-05 1:29

Hi,

I have an application (in VC++ 6.0) wherein it displays the images in ListView. So the application starts displaying the images from the Top left corner (0,0).
Now I have added the manifest file (to give XP look to application) in applicatoin resource successfully. (as outlined in the below mentioned link http://www.codeguru.com/Cpp/controls/controls/article.php/c5227/)
The application is having the XP look but the images are displayed from the Bottom left corner.

Please I need some help in understanding
1. Why origin of the ListCtrl is changing
2 .How to set the origin of the ListCtrl to top left corner (0,0) so that the images are displayed from the top left corner (0,0) ?

Any help in this regard is highly appreciated.

Thanks in advance

Thanks & Regards,
Neeraj

Grayscale Image Display

Reiste2-Jun-05 0:51

Reiste

2-Jun-05 0:51

Hi.

This problem has been driving me mad for too long now. I have a 640x480 char array of data. I need to display that in grayscale in a Window (currently using a CFrameWnd). I can't copy it to a 640x480x3 array and use SetDIBitsToDevice - that isn't fast enough (it's for a video application).

At the moment, I am using SetDIBitsToDevice with BITMAPINFO.biBitCount set to 8. The image displays correctly, except not in Grayscale - it's in a psychedelic 256-color palette mapping of some sort - I assume Window's default.

Try as I might, I can't get it to use a grayscale palette. I can't even create a palette from scratch - maybe if I could, I could get this to work. I've read Chris Becke's article on Bitmaps, and checked out forums all over - but nothing seems quite related to what I want to do. I can't believe that it is this difficult!

If anyone has an answer, or can recommend an article that would help... please do!

Re: Grayscale Image Display

C^hris L^osinger2-Jun-05 3:55

C^hris L^osinger

2-Jun-05 3:55

have you tried putting your array into a DIB / DIBSection ?

Cleek | Image Toolkits | Thumbnail maker

DeflateRect

Dennis L2-Jun-05 0:33

Dennis L

2-Jun-05 0:33

Hi All!

What's the SDK function of the DeflateRect of MFC

Re: DeflateRect

Stlan2-Jun-05 0:56

Stlan

2-Jun-05 0:56

There is no corresponding function in the SDK. Actually, if you look at the definition of CRect::DeflateRect, you will see that it calls ::InflateRect by negating the parameters.

Re: DeflateRect

ThatsAlok2-Jun-05 1:10

ThatsAlok

2-Jun-05 1:10

Which finger are you using today?

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: DeflateRect

Stlan2-Jun-05 1:13

Stlan

2-Jun-05 1:13

That's because I have plugged 2 keyboards on my PC so that now I can type twice faster than you! Big Grin | :-D

Re: DeflateRect

ThatsAlok2-Jun-05 1:23

ThatsAlok

2-Jun-05 1:23

Stlan wrote:
I have plugged 2 keyboards on my PC

OMG | :OMG:

Stlan wrote:
now I can type twice faster than you!

Laugh | :laugh:

;)

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

Re: DeflateRect

ThatsAlok2-Jun-05 1:07

ThatsAlok

2-Jun-05 1:07

Dennis L wrote:
What's the SDK function of the DeflateRect of MFC

No SDK available for that, you have to implement that. here is small logic to proceed :-

void MyDeflate(RECT *rect,int left,int top,int right,int bottom)<br />
{<br />
	rect->bottom-=bottom;<br />
	rect->right-=right;<br />
<br />
	rect->top+=top;<br />
	rect->left+=left;<br />
<br />
<br />
}<br />
<br />
void MyDeflate(RECT *rect,SIZE size)<br />
{<br />
	MyDeflate(rect,size.cx,size.cy);<br />
}<br />
<br />
void MyDeflate(RECT *rect,int x, int y)<br />
{<br />
	MyDeflate(rect,x,x,y,y);<br />
<br />
}

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

cheers,
Alok Gupta

VC6 and Virtual PC

Davy Mitchell2-Jun-05 0:22

Davy Mitchell

2-Jun-05 0:22

Hey People,

I am finding using VC6 under Virtual PC to be very painful esp. when designing a dialog? Other Apps respond fine. Any Suggestions? I am running the latest VPC, XP, etc.

Thanks,

Davy

My Personal Blog - Homepage

Re: VC6 and Virtual PC

Rutger Ellen2-Jun-05 1:07

Rutger Ellen

2-Jun-05 1:07

I suggest using RDP to access the virtual machine instead of using the 'normal' console. a RDP session is much more responsive.

Rutger

Import C++ function in C Programs

phijophlip2-Jun-05 0:09

phijophlip

2-Jun-05 0:09

Hello Friends,

It it possible to import c++ function in C program.
For example we can import c program to to cpp using extern "C".Is it possible other way round.

Best Regards
Philip.

seekg

mcsherry1-Jun-05 23:19

mcsherry

1-Jun-05 23:19

I'm currently processing a very large binary file in which I need to move backwards and forwards through the file to check for start and end markers, once I've found a matching start and end marker I then go back to the end of the start marker and read in all of the data upto (and including) the end marker.

However I've found that when I use:
seekg ( -1, ios::cur )

it appears to stay on the current element, so I have to do
seekg ( -2, ios::cur ).

Is this correct behaviour? (btw I'm using -1 and -2 only as example values).

many thanks,
Andy

Re: seekg

Cedric Moonen1-Jun-05 23:30

Cedric Moonen

1-Jun-05 23:30

It's not staying on the same element.

Take an example, you have this text in a file: "Test". At the begining, the "file pointer" points before the letter 'T', then if you read this character, the file pointer will point just before the letter 'e'. Thus, if you do: seekg ( -1, ios::cur ), it will rewind one character and thus pointing before 'T', that is the letter you just read. So, as you can see it is not staying on the same element ! Because if didn't use the seekg ( -1, ios::cur ), you would have read the 'e' letter instead of 'T'.

Is it a little clearer ?

Re: seekg

mcsherry1-Jun-05 23:50

mcsherry

1-Jun-05 23:50

cheers, I totally forgot that reading it would also incrment it as well D'Oh! | :doh:

I Can't IE Key press... But. I want Active X control's Key press

seredius1-Jun-05 23:16

seredius

1-Jun-05 23:16

I making Active X Control, But IE Key Press( ex)CTRL+R ,CTRL+E) ) is very Problem.....
I Want Active X control Key Press.But,
I can't close IE key press.
The problem is solved by me.

Seredius

Re: I Can't IE Key press... But. I want Active X control's Key press

Weiye Chen1-Jun-05 23:43

Weiye Chen

1-Jun-05 23:43

Jokes do not belong to this forum. Hmmm | :|

<font=arial>Weiye Chen
Life is hard, yet we are made of flesh...

Re: I Can't IE Key press... But. I want Active X control's Key press

xcavin2-Jun-05 1:57

xcavin

2-Jun-05 1:57

seredius wrote:
The problem is solved by me.

can you please share it. I also remember faced similar one.

Background Color

leifmikael1-Jun-05 23:15

leifmikael

1-Jun-05 23:15

I'm using the CHOOSECOLOR to change the background color on a hEdit = CreateWindowEx(WS_EX_CLIENTEDGE, "EDIT",.....
control window.
However there is only the background on the main window that changes
hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,MainWindow,.....

Part of the code
SetClassLong(hwnd, GCL_HBRBACKGROUND, (LONG)hbrush);
InvalidateRgn(hwnd, NULL, TRUE);

What's wrong?
Is it possible to edit the bg color on the hedit window?

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