C / C++ / MFC Discussion Boards

Re: Operator overloading

tbrake31-Jan-06 5:53

tbrake

31-Jan-06 5:53

Year your right !?!

But whenever i try something like

<br />
Complex operator! (double&, Complex&);<br />
class Complex<br />
{<br />
...<br />
};<br />

I receive some errors!

And second isn't ist possible to combine all "+" or "+=" ... functions so that there is only one to modify and not like the class i posted changeing always 3 methods ??

T

Re: Operator overloading

David Crow31-Jan-06 6:09

David Crow

31-Jan-06 6:09

tbrake wrote:
I receive some errors!

What errors?

class Complex
{
...
};
 
Complex operator!( double&, Complex& );

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Detect and Fill part of an image

beko31-Jan-06 0:30

beko

31-Jan-06 0:30

Hello,

I want to implement something similar to map colouring (Not the famous problem but actually filling). Let us say, i have a picture of a continent, and i want to select a country and fill it with a colour and also in a list view, i want to highlight that country with some additional info.

At first, i thought i could get points (borders of a country), and use triangulation or polygon filling and define bounding rectangles or polygons (simple way, not using any tree implementation), but this approach needs lots of data generated by me. (using OpenGL)

my question is, is it feasible to implement this with a picture, detecting boundaries (i saw threads about edge detection) automatically for each country name and store them for hit testing and use filling algorithms (flood vs.)? (I am a real beginner on Image Processing, Bitmap Handling, GDI etc. Smile | :)

)

How would you solve this?

Thank you,

Bekir Turkmen.

Re: Detect and Fill part of an image

C^hris L^osinger31-Jan-06 2:05

C^hris L^osinger

31-Jan-06 2:05

beko wrote:
us say, i have a picture of a continent, and i want to select a country and fill it with a colour and also in a list view, i want to highlight that country with some additional info.

do you already know the boundaries of the countries ? if so, how are the boundaries stored ?

Cleek | Image Toolkits | Thumbnail maker

Re: Detect and Fill part of an image

beko31-Jan-06 2:39

beko

31-Jan-06 2:39

i dont know the boundaries initially.

However, i can find them manually and store them as point vectors for using input to Delaunay Triangulation (i have implemented one or two parts this way, without using any info from any picture) and display it with OpenGL.

I do not need any information about boundaries actually other than hit testing, so i thought i could retrieve those boundaries(using edge detection algorithms) from the picture directly and display the picture as the view.(In data preparation stage, for example, when i click Canada, i will generate the boundary data and define it as Canada and write to a file (perhaps with some processing to reduce number of points) to read it later for hit testing.)

Note that in the picture, boundaries are clearly given.

Thanks.

Bekir.

Re: Detect and Fill part of an image

A.A.31-Jan-06 7:47

A.A.

31-Jan-06 7:47

Way too little information to make a decent recommendation. If the area under the different regions have similiar features, look into doing some kind of connected component analysis.

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Re: Detect and Fill part of an image

normanS31-Jan-06 20:16

normanS

31-Jan-06 20:16

I suggest brute-force and pig-ignorance. It's not pretty, but it always works for me!

Assuming the map is static (because the countries / areas don't change) you could colour a bitmap image of the map offline, using some graphics package, so that all countries use different colours. If you use 24-bit colours, the difference could be in a single LSbit, which would un-noticeable.

Then display the map as a bitmap image. When you click on a point, get the colour under the cursor, and match that to the country, in order to get country-specific information. To change the colour you could (using brute force) loop through all the pixels in a copy of your original bitmap, replacing all pixels of the matching colour with a new colour, then display the updated bitmap.

Re: Detect and Fill part of an image

beko1-Feb-06 1:01

beko

1-Feb-06 1:01

Thanks for the suggestion,

I think that is quite practical, i will try to implement the way you suggested.

Thanks to all replies.

Bekir.

Re: Detect and Fill part of an image

normanS1-Feb-06 19:16

normanS

1-Feb-06 19:16

Great!

It's a lot easier to use the brute force approach and get the computer to work hard, rather than to have to learn how to implement complicated edge-detection algorithms.

Of course, if the map changes frequently, my suggestion would not be useful.

want to kill previous instance of the same MFC app

Aryan S31-Jan-06 0:12

Aryan S

31-Jan-06 0:12

I want my MFC application will check whether another instance of it is already running or not. And if another inst. is running then it will kill the prev process. I want to know how get the information whether another instance is running and not? and how to get the process id of that one?

Re: want to kill previous instance of the same MFC app

Owner drawn31-Jan-06 1:05

Owner drawn

31-Jan-06 1:05

http://www.codeproject.com/cpp/avoidmultinstance.asp[^]

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Re: want to kill previous instance of the same MFC app

Rage31-Jan-06 1:52

Rage

31-Jan-06 1:52

And my favourite as well :

http://www.codeproject.com/cpp/csingleinst.asp[^]

~RaGE();

Setting wallpaper before SwitchDesktop

Chintoo72331-Jan-06 0:08

Chintoo723

31-Jan-06 0:08

I have a multiple desktop application in which I am trying to set a different wall paper when you switch between different desktops. I am setting the wallpaper as:

<br />
SystemParametersInfo(SPI_SETDESKWALLPAPER,0,(void*)m_WallPaper,SPIF_UPDATEINIFILE|SPIF_SENDWININICHANGE)<br />

This seems to set the wall paper correctly, but after I call SwitchDesktop the wall paper vanishes a few seconds later. I create a seperate explorer.exe per desktop.

1. Does any one know if there is any other way to set the wall paper?
2. Is it possible to identify what causes the wall paper to change? I mean, who has changed it?
3. Is the wall paper set by the system or windows explorer?
4. Any ideas to debug why the wall paper vanishes?

thanks!

Re: Setting wallpaper before SwitchDesktop

Owner drawn31-Jan-06 0:19

Owner drawn

31-Jan-06 0:19

Brundiez wrote:
SystemParametersInfo(SPI_SETDESKWALLPAPER,0,(void*)m_WallPaper,SPIF_UPDATEINIFILE|SPIF_SENDWININICHANGE)

This won't work when ActiveDesktop is enabled. You need to use IActiveDesktop COM object to solve this.

http://www.codeproject.com/tools/wallpaperq.asp[^]

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Re: Setting wallpaper before SwitchDesktop

Chintoo72331-Jan-06 0:33

Chintoo723

31-Jan-06 0:33

1. From the look of my desktop, I dont think I have ActiveDesktop enabled. How do I confirm if it is enabled?
2. Does the IActiveDesktop COM object's way of setting the wall paper help in both the cases - ActiveDesktop is enabled and disabled?
3. FYI, I downloaded Virtual Desktop manager from http://www.microsoft.com/windowsxp/downloads/powertoys/xppowertoys.mspx. I can change the wall paper in a desktop, but when I switch between desktop it doesnt seem remember and restore the wall paper that I changed. Have you used this, any idea why it doesnt work, is it a bug?

thanks!

char[] to cstring

Member 227165530-Jan-06 23:38

Member 2271655

30-Jan-06 23:38

convert char[] to cstring

Thanks in Advance

Re: char[] to cstring

Owner drawn30-Jan-06 23:45

Owner drawn

30-Jan-06 23:45

char str[] ="I am a good boy";

CString str1 = str;
MessageBox(str);

CString str1;
str1 = str;
MessageBox(str);

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Re: char[] to cstring

Member 227165530-Jan-06 23:57

Member 2271655

30-Jan-06 23:57

Thank u for ur responce

i am sorry , i need to assign a array element

CString s[10]
char ch[]
-
s[i]=ch

any how thanks a lot

Re: char[] to cstring

Owner drawn31-Jan-06 0:00

Owner drawn

31-Jan-06 0:00

ptr_Electron wrote:
i am sorry , i need to assign a array element

So what

char str[] ="Owner drawn is a good boy";
CString str1[10];
str1[0] = str;
MessageBox(str1[0]);

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Re: char[] to cstring [deleted]

toxcct31-Jan-06 0:20

toxcct

31-Jan-06 0:20

sorry, misunderstood...

the guy might refer to CString[^] doc anyway...

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[toxcct][VisualCalc 2.20][VCalc 3.0 soon...]

-- modified at 6:24 Tuesday 31st January, 2006

Re: char[] to cstring(edited)

Owner drawn31-Jan-06 0:21

Owner drawn

31-Jan-06 0:21

>>the guy might refer to CString[^] doc anyway...

Yeah.

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Re: char[] to cstring

Member 227165530-Jan-06 23:59

Member 2271655

30-Jan-06 23:59

is the same way to do with CString array

Thank in Advance

Re: char[] to cstring

Owner drawn31-Jan-06 0:01

Owner drawn

31-Jan-06 0:01

I answered to your previous post. You can look there.

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Re: char[] to cstring

Member 227165531-Jan-06 0:32

Member 2271655

31-Jan-06 0:32

Thank u very much

Getting Hex value from Edit box ?

kk_vp30-Jan-06 23:09

kk_vp

30-Jan-06 23:09

Hi,

I have a dialog application where user enters hex values in CEditbox.
Is there a editbox where we can create a member variable of type HEX??
for CEDIT, only int, long, byte etc are possible but not HEX.
the hex value can range from 0x00 to 0xFFFFFFFFFFFFFFFF
in this case.

Any clues on how to do this???? Confused | :confused:

- KK

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