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First Select the HBITMAP In dc and then call GetPixel(..) with 0,0 as parameter .
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
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hiho
i'm using a browser helper object, which i didn't write
the first problem now, was that the compiler didn't find the definition of CDC
so i made a temporary new project, which uses MFC as a dll
i copied the stdafx.h of my helper object
now everything works but:
i get the following error:
BHO error LNK2005: _DllMain@12 already defined in bho.obj
i read this article
http://support.microsoft.com/default.aspx?scid=kb;en-us;q148652
but i'm not really sure what to do?
the problem is that it seems that some libraries are compiled before the MFC libs (i need MFC libs first)
i used the linker option: /verbose:lib
and i got MANY MANY libs used!
so how should i know the compiler order?
or is there another solution?
OR anybody knows a differen solution for getting the upper left pixel than using CDC?
thx
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Hello,
There are also other solutions given in the article. Did you try those?
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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jup
tried but didn't work
now i made it using GDI functions:
i tried the following:
HDC hdc=::GetDC(parent);
SelectObject(hdc,hbmp);
SetPixel(hdc,1,1,RGB(255,0,0))
COLORREF cf=GetPixel(hdc,1,1);
i should get 255,0,0 using GetR/G/BValue functions, not?
but i get 255,255,255
i also tried make a CWindow by myself using ::GetDesktopWindow() as parent
--> the same problem
??
if i try to make my own CWindow without a parent
(new CWindow(), Create("test",NULL))
i get an exception
what could be the problem, that i get the false RGB values?
thx@ll
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There could be a lot of reasons that it doesn't work. I don't know excactly which one it is, but you could check the return values of the functions and display any error information. That often helps..
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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seems i have to give up
i tried GetLastError and i got "not enough memory"? huh?
well i think the problem is that i don't "allocate" the window correctly, because i'm using CWindow which is just a wrapper around an existing window
i tried to use CreateWindow but then i get "Windowclass not found" error
so i think i will give up that or anybody could please post, how i can make a temporary window so i have a DC using ATL functions? (i read some articles! don't know so far) would be helpful if somebody could post a little bit of code
thx
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We cannot help you very much right now, since we have little information. Maybe if you start a new thread (since this one is out of sight), with a question like: "Howto create temporary DC from a HBITMAP using ATL / Win32API?".
In addition to your question, provide the code that doens't work, clear, but brief explanation of your intentions and what you think that should happen and the information presented above. See the FAQ[^] for more information about posting guidelines.
The key to getting an answer is providing us with ample information about your problem.
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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the problem is that (i think) i have some code which should work (i already posted here!)
so i have something which i don't know why it doesn't work
what i want? i have explained
what i do? i posted the code
why it doesn't work? who knows
the problem why i give little information is that i don't have much information
i don't really know what to post more?
but i will do a new thread
thx 
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Hello,
This[^] class / lib has some handy functions to work with images. I saw some functions that you can use to get your pixel. If you only want to get that pixel, the class is somewhat excessive.
You can also use the GDI do work with the bitmaps. Start some reading here[^] to get aquainted with it..
Behind every great black man...
... is the police. - Conspiracy brother
Blog[^]
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I want to Refresh or erase the content of my CRichEditCtrl
Please tell me the Class Member function i want to choose
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dittygrail wrote:
I want to Refresh or erase the content of my CRichEditCtrl
Hows this?
// Delete all of the text.
pmyRichEditCtrl->SetSel(0, -1);
pmyRichEditCtrl->Clear();
CRichEditCtrl Class Members[^]
-------------------------------
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dittygrail wrote:
I want to...erase the content of my CRichEditCtrl
Please tell me the Class Member function i want to choose
What's wrong with SetWindowText("")?
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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hi all,
I have a CHtmlView, when I right click the view, a default menu pops up, which contains a set of menu items (such as Refresh, Back, Fonts).
Now I want to remove the popup menu.
I have tried all but the menu is still there and can not be removed.
by the way, disable messages on PreTranslateMessage() function does not work as I tested.
could u halp me?
thx
includeh10
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Did you try:
CHtmlView::OnShowContextMenu
And this will do the job anyway:
By implementing IDocHostUIHandler interface.
this is this.
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Friends,
In my MFC based application, the main application window is somethime visible and sometimes not. Whn i made my window invisible using ShowWindow(0), its taskbar button also becomes invisible. What i want is that task bar button should remain visible whether application windows is visible or not.
How can i do so?
Imtiaz
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Imtiaz Murtaza wrote:
Whn i made my window invisible using ShowWindow(0)
Instead of making it Invisible by calling ShowWindow(SW_HIDE), resize it to 0,0 so that window become invisible from desktop but taskbar button remain visible
"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow
cheers,
Alok Gupta
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Hi,
While working with CAsyncSocket we discovered that our application has a memory leak. Tracing it we finally found that inside CAsyncSocket class a new window is created for every socket object. Trying the following code:
for (int i=0; i<6000; i++)
{
CWnd* pWnd = new CWnd;
pWnd->CreateEx(0, AfxRegisterWndClass(0),_T("Socket Notification Sink"),
WS_OVERLAPPED, 0, 0, 0, 0, NULL, NULL);
pWnd->DestroyWindow();
delete pWnd;
::Sleep(10);
}
we tested it to realize that it causes a memory leak in our app.
Is there some problem with CreateEx?
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Are you sure that the memory leak is a CWnd object?
Don't try it, just do it! 
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I'm not sure where the leak is, but if I change the call to CreateEx (for example different styles for the window) I can't see it anymore.
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There is an easy way to trace memory leaks.
When your application closes, then you remember the byte count of the leaks the debugger is displaying.
Now set a checkpoint at the new operator routine (breakpoint at a new call, and then step into) with a condition of n = byte count.
Now the debugger will break every time an object with size n is allocated... just step out of the new operator and you will see what object it is.
Don't try it, just do it!
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The debugger doesn't report a memory leak, that's why it's so confusing. But looking at the amount of memory the application consumes it constantly goes up and only goes down when I close the app.
If you can try those few lines of code I posted above you will see it happening.
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Hi,
im trying to use the specific value of an array in a computation in another function; but don't know how to set it up. In test(), i want to use the 6th value of C[] in the computation. How do i set this up please?
<br />
#include "stdafx.h"<br />
#include <cmath><br />
<br />
const int size = 10;<br />
double A[size] = {0},B[size] = {0}, C[size],c,d;<br />
<br />
double PI = 3.141592653589793238462643383279502884197;<br />
<br />
void rah(double C[])<br />
{<br />
<br />
for (int i=0;i<size;i++)<br />
{<br />
A[i] = sqrt(10*i);<br />
B[i] = 2*PI*i;<br />
C[i] = A[i]*B[i];<br />
}<br />
}<br />
<br />
double test()
{<br />
rah(C);<br />
d = PI * rah(C[5]);<br />
<br />
}<br />
<br />
<br />
int main(int argc, char* argv[])<br />
{<br />
test();<br />
return 0;<br />
}<br />
<br />
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i am not clear abt ur requirement. try this
#include <stdio.h>
#include <math.h>
const int size = 10;
double A[size] = {0},B[size] = {0}, C[size],c,d;
double PI = 3.141592653589793238462643383279502884197;
double rah(double *C)
{
int i = C-::C ;
A[i] = sqrt(10*i);
B[i] = 2*PI*i;
::C[i] = A[i]*B[i];
return ::C[i] ;
}
double test()//how do i write this correctly?
{
d = PI * rah(&C[5]);
return d ;
}
int main(int argc, char* argv[])
{
printf("Hello World!\n %f", test());
return 0;
}
naren
VC++ programmer
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aaadetos wrote:
In test(), i want to use the 6th value of C[] in the computation. How do i set this up please?
double test()//how do i write this correctly?
{
rah(C);
d = PI * rah(C[5]);
}
It appears that you are already using "the 6th value of C[] in the computation." What is it that you think is wrong?
The code that I do see as wrong is when you are calling the rah() function. rah() is expecting a double array (i.e., C[]), yet you are calling it with a single double value (i.e., C[5]).
"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown
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