C / C++ / MFC

Re: RGB from bmp instead from desktop?

10-Oct-07 21:16

It will be a gigantic change!!! Smile | :)

Anyway trying LoadImage might be a solution.

- NS -

Nibu babu thomas10-Oct-07 21:34

Mouse Click Message From Desktop

10-Oct-07 21:34

purplee85 wrote:
This program enable me to get RGB from desktop but how can i modify it to get the RGB from a bmp image instead?

Here is a function that does this...

COLORREF GetPixelValueFromBitmap( const int x, const int y, CBitmap& bmp )
{
	CDC dcDesktop;
	dcDesktop.Attach( ::GetDC( GetDesktopWindow() ));
	
	CDC dc;
	dc.CreateCompatibleDC( &dcDesktop );
	const int nRestorePoint = dc.SaveDC();
	dc.SelectObject( &bmp );
	const COLORREF clr = dc.GetPixel( x, y );
	dc.RestoreDC( nRestorePoint );

	return clr;
}

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

OS compatibility!!

vipin_nvk10-Oct-07 21:01

vipin_nvk

10-Oct-07 21:01

Hello

I had developed a windows service at my office PC having Win2000 installed. I brought the same code back to my home PC which has WinXP installed on it. Now when I tried to run the windows service, I got the following error:

Error Code :1153
Symbol :ERROR_RMODE_APP
Description : The specified program was written for an earlier version of Windows.

Which means the service developed on Win2000 PC cannot run on WinXP PC. But logically should this error come up? Is the .exe generated by VC++ IDE also dependent on the PC on which the application has been developed?

Will the reverse case also give me an error? Say if I develop the application on WinXP and try to run it on Win2000?

Thanx.

Re: OS compatibility!!

Matthew Faithfull10-Oct-07 23:06

Matthew Faithfull

10-Oct-07 23:06

vipin_nvk wrote:
Is the .exe generated by VC++ IDE also dependent on the PC on which the application has been developed?

This is the key point and the answer is, it can be, in at least the following ways.

1. Installed SDK. The code you develop on your Win2K PC will be diferent depending on what version of Visual C++ and what version of and SDKs are installed. These will effectively change your source. You can update these to versions capable of build XP apps if they are not already.

2. Test platform. The code you build on the Win2K PC may work there against the Win32 API verion available there but that does not automatically gaurentee it will work against XP. Remember that every Win32 application loads up Dlls that are part of Windows from the machines where it's installed and then makes hundreds of calls into these Dlls. If one function is missing, or perhaps behaves differently then things can go wrong.

Two points to note in your specific case.

1. The reason for the failure may not actually be the Win2K vs XP differences it could possibly be just the general difference between the two machines although with the error you're getting this is unlikely.

2. The requirements and environment for Services in particular are very Windows version specific. It may be that your Win2K developed service does not do all the things or meet all the timings required by an XP Service. MS tightens things up in security for example with each release.

With all that in mind in the end it could be as simple as which value of the _WIN32_WINNT you've compiled with. Unless you set this to at least 0x0501 I wouldn't expect the service to start on XP.

Nothing is exactly what it seems but everything with seems can be unpicked.

ashishbhatt10-Oct-07 20:52

ashishbhatt

10-Oct-07 20:52

I Am Using MFC Application.
How Can I Get The Handler Of Click Event From My Desktop?? I Want To Get The Message Of The Mouse Event In My Window Procedure Method.

Plz Reply If U Get Some Solution..

Thanks

Nishad S10-Oct-07 21:23

10-Oct-07 21:23

If you can capture the mouse (see SetCapture) then all the mouse messages will be obtained to your window through OnLButtonDown, OnLButtonUp, OnMouseMove, etc.

If you cant use a mouse hook. You will get enough articles here in CP regarding this.

- NS -

Nishad S10-Oct-07 23:23

10-Oct-07 23:23

If you need to get the mouse messages without affecting its functionalities, you cant capture the mouse. That means if you capture the mouse then all the events will be towards you. You cant click anything in another window.

ashishbhatt wrote:
And From Your Reply...........

If you cant use a mouse hook. You will get enough articles here in CP regarding this.

Actually I meant, "If you cant do a mouse capture, then use a mouse hook" And CP means CodeProject.

- NS -

ashishbhatt11-Oct-07 1:37

ashishbhatt

11-Oct-07 1:37

Hello ,

I have tried with SetCapture() function , it works but it gives message only at first time i click on the desktop (or client Area which i have created as window using WNDCLASSEX and CreateWIndow()) and then i click on the disktop that msg does not come or my procedure does not catch it.

I am using window procedure to catch the message.

Plz Reply me.

Thanks....

Nishad S11-Oct-07 1:43

11-Oct-07 1:43

Can you explain your purpose?

- NS -

ashishbhatt11-Oct-07 2:00

ashishbhatt

11-Oct-07 2:00

Hi,

Let me explain in detail.

I have taken my MFC application.. OK. In that I have taken one Simple Class with diff .cpp and .h files(RTMPDesk.cpp). In this class I want to check that whenever click on desktop or any other client area than that message should be catch by Application.So, for that i created on window using WNDCLASSEX structure and Createwindow() function.And I catch messages in Window Procedure which i have created in RTMPDesk.cpp file.

So , iget only one time whenever i click on that created window.I want to check it for every time wenever i click on window.Ok....

I hope everythig is clear.

Plz help me.

Ashish

Nishad S11-Oct-07 18:03

how to read the Red Green and Blue values from a bmp image file?

11-Oct-07 18:03

OK... my doubt is that whether you want to block the mouse click to other windows when your application is running? Or only you need to get the event, but the other applications should get the click as usual?

For the first case, you can make a top level transparent window which covers the whole desktop, so all the mouse events will be sent to this transparent window.

For the second case, AFAIK, only mouse hooking is a solution.

- NS -

purplee8510-Oct-07 20:48

purplee85

10-Oct-07 20:48

Hi everyone...

totally clueless abt how to write a C++ program to return the RGB values of an image!! Can anyone help?

Re: how to read the Red Green and Blue values from a bmp image file?

Nelek10-Oct-07 20:51

Nelek

10-Oct-07 20:51

CDC::GetPixel  <br />
COLORREF GetPixel( int x, int y ) const;<br />
COLORREF GetPixel( POINT point ) const;<br />

<br />
::GetPixel ()<br />
COLORREF GetPixel(<br />
  HDC hdc,   // handle to device context<br />
  int XPos,  // x-coordinate of pixel<br />
  int nYPos  // y-coordinate of pixel<br />
);<br />

will help you

Greetings.

--------
M.D.V.

If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?

Help me to understand what I'm saying, and I'll explain it better to you

Wink | ;)

Re: how to read the Red Green and Blue values from a bmp image file?

purplee8510-Oct-07 20:55

purplee85

10-Oct-07 20:55

Thanks...

How to implement this function in a program to read pixel values from a bmp image(eg. purple.bmp)?
Is it ok for you to show me a sample of how this works?

With regards,
Purplee

Re: how to read the Red Green and Blue values from a bmp image file?

Nelek10-Oct-07 22:43

Nelek

10-Oct-07 22:43

To make an example would be large and, actually, your work.

Try it and post when you have problems, start looking in the codeproject and google, there are examples for sure.

Good luck

Vectors!

Michael10110-Oct-07 20:17

Michael101

10-Oct-07 20:17

Hey,

I have a for loop iterating through a Vector. When my program hits certain conditions it needs to do get the value of an element and add one to it.

I tried this but it didn't work:

PrimeNumber(Iter + 1) += 1;

It has to be the next element in the vector and it has to increment that next elements value by one! I've tried declaring an Iterator and using similar code -> *Iter + 1 += 1; but that still doesn't work Frown | :-(

Does anyone have any ideas on how to modify the content of a vector? Thanks for all the help in advance I appreciate it!

Smile | :)

Michael

Re: Vectors!

Nibu babu thomas10-Oct-07 20:28

10-Oct-07 20:28

Michael101 wrote:
using similar code -> *Iter + 1 += 1; but that still doesn't work

*(Iter + 1) += 1;

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

Re: Vectors!

Michael10110-Oct-07 20:29

Michael101

10-Oct-07 20:29

You Champion! Big Grin | :-D

Re: Vectors!

Nibu babu thomas10-Oct-07 20:32

Attach the caption of the child window to the Frame

10-Oct-07 20:32

Make sure you don't go beyond/access vector<>::end() when doing +1.

Nibu thomas
MVP For VC++

Code must be written to be read, not by the compiler, but by another human being.

Programming Blog: http:\\nibuthomas.wordpress.com

prithaa10-Oct-07 20:04

prithaa

10-Oct-07 20:04

Hello,

How can I attach child window's caption to the frame window in the OnSize() Function?

Right when I maximize the child window it gets maximized without actually the caption getting merged with te frame window.
This is the code in the OnSize()
switch(nType)
{
case SIZE_MAXIMIZED :
{
CRect R;
GetParentFrame()->GetClientRect(R);
MoveWindow(R,true);
break;
}
}

Regards
Prithaa

Re: Attach the caption of the child window to the Frame

Nibu babu thomas10-Oct-07 20:06