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If you just draw the toolbar button and the ID of the button isn't assigned a message handler then it also will be disabled. Use ClassWizard and add a new function for the toolbar ID in CMainFrame, CView, or CDocument derived class.
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I make static link library and use it but the problem is that if for example I have CHTMLHelp class in my lib and use it in other project (its includes are in global include file), putting a point after variable of its type not opens its members and functions. But if I add that class header once , compile the roject and remove the header, all functions and methods become visible ! How can I do that all methods of the static link library would be visible at once without such tricks.
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I need to create a MDI Application where there is toolbox's that when are active don't cause the main application window or document window to become unactive. The toolbox's should preferably be modeless dialog boxes. Sort of like Adobe Photoshop.
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Hi,
I want to implement a list control that allows dragging of an item from it and dropping it onto some other window (which may belong to a different app). The text of the item being dragged should get copied into the dropped window if allows drag-drop. Can someone provide some hints in doing this?
Thanks in advance
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Hi all,
I want to write API program by VC++,
I create cpp file and i wrote my source code, then i create rc file and i add some icon and ...
Now, i want to create a project that i can add my cpp and rc files to prject.
How can i do this ?
I choosed MakeFile in File->New, and i added my files to project, but when i compile, compiler indicate to me Linker problem in Setting menu !!!
My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html
Hadi Rezaie
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I think you should post more details on your errors ....
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You should choose a Win32 Application and then tell the wizard you want an empty one - or the simple from which you can remove all the files they supply. Then, add your files to it and recompile.
Hope that helps,
> Andrew.
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Hi Andrew,
Now i got this error:
fatal error C1010: unexpected end of file while looking for precompiled header directive
How can i solve it ?
My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html
Hadi Rezaie
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This question is answered in Michael Dunn's Visual C++ Forum FAQ, you can find the answer by clicking here.
> Andrew.
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Hi Mr.Andrew,
Thanks alooooooot for your help ...
My month article: Game programming by DirectX by Lan Mader.
Please visit in: www.geocities.com/hadi_rezaie/index.html
Hadi Rezaie
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i am making a program where i need to constantly check for a change in the state of a socket, and i was wondering if there is any way to draw a dialog box so it allow me to use the OnIdle() function of the main class of my program, or if there is a similar function that is available through the CDialog class. i've tried drawing a modeless dialog, but it won't appear but for a fraction of a second. any help would be greatly appreciated.
-Aaron
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I'm not sure if this is what you mean but if you try creating a second thread and attach a modal dialog box you should be able to create a loop that won't interupt your main application.
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Another option is to handle the WM_KICKIDLE private MFC message, which is defined in afxpriv.h
Your handler for this message would be the equivalent of OnIdle in your main class.
Derek Lakin.
Salamander Software Ltd.
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Hi All!
I'm writing some control in C++/MFC. It is basically ready, and now I'm working on speed it up/optimization. I found that BitBlt operation consumes significant amount of time:
/* sorry I'm writing from my home computer with no C++ installed and no sources, so there may be error in function names/parameters - not relevant to problem.
*/
CToolBtnList::OnPaint()
{ dc = CPaintDC(this); // or something like this...
CRect rect;
GetClientRect(&rect);
CDC memDC;
memDC.CreateCompatibleDC(NULL);
// this one is needed because I want first create
// image on it piece by piece and then copy it to
// PaintDC
CBitmap bitmap, *poldbitmap;
bitmap.CreateCompatibleBitmap(&memDC, etc...);
poldbitmap = memDC.SelectObject(&bitmap);
....
DrawBackground(&memDC);
....
// here I'm calling another my function:
DrawButtonsArea(&memDC);
...
...
/* place 1*/
dc.BitBlt(....., &memDC, ...., SRCCOPY); // one-to-one copy
memDC.SelectObject(poldbitmap);
memDC.DeleteDC();
bitmap.DeleteObject();
}
CToolBtnList::DrawButtonsArea(CDC* pDC)
{ /* and here I'm doing another copy: this is essential,
because I need to have possibility to cut what I've drawn by specific area without affecting other areas
*/
// repeat all the same:
CRect rect;
GetClientRect(&rect);
CDC memDC;
memDC.CreateCompatibleDC(NULL);
// this one is needed because I want first create
// image on it piece by piece and then copy it to
// PaintDC
CBitmap bitmap, *poldbitmap;
bitmap.CreateCompatibleBitmap(&memDC, etc...);
poldbitmap = memDC.SelectObject(&bitmap);
/* place 2*/
memDc.BitBlt(....., pdc, ....,SRCCOPY); // one-to-one copy
....
....
/* place 3*/
pdc.BitBlt(..., &memDC, ..., SRCCOPY); // this is cutted copy - not one-to-one
}
I'm calling Invalidate() each time when mouse moves to specific location (another "button" inside of control).
On silly test to call Invalidate() each 100ms (which is quite reasonable in my case) I found that my thread consumes 30% of processor time (which is unreasonable).
If I'll take out that 3 places (so I'm doing all other work, just don't do that copying), it goes down to 0% or 1% - even with all (~20) animated GIFs fooling around in worker thread.
Next tests showed that BitBlt operation _to_ PaintDC eats about 6% of processor time, and BitBlt operation _from_ PaintDC to memoryDC eats 15%-20% of processor time (which I can't understand: this is the same function with almost exactly same amout of data).
In archives here I found ::CopyImage function and will try it Monday at work, but I still doubt it can improve performance.
I understand that DIB processing will be faster, but I need DC functions to draw (line, ellipse, etc), so it will not work. How else can I speed this section up?
I'll try eliminate first copy to memDC (in OnPaint function), but I'm afraid it will be flickering.
Any other suggestions? How can I _directly_ copy data from one bitmap to another in memory without going to DC, and do it most efficient way without using DIBs? (something like memcpy  ).
Any help will be appreciated.
Oh, by the way, I've tried GetBitmapBits and SetBitmapBits, and also I've tried bitmap<->DIB conversion (GetDIBits and SetDIBitsToDevice) - absolutely same speed 
SY-
Kosta.
Kosta - wolf alone.
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I am creating a CTreeCtrl derived class, that will act similiar to the left side of Windows Explorer. I need to do some initialization (like display the drives) as soon as possible, which is right after the window is shows. What message, or function do I need to catch/override in order to do this.
Thanks, John
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OnInitialUpdate
Bret Faller
Odyssey Computing, Inc.
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Okay, i may/maynot get flamed for this post, but I'm going to wear my aluminium pants anyway.
What is the real advantage/purpose of 32, 64, or 96+ bit integers????????? I mean, I know my computer's hardware is 16/32, but what I don't understand is why in programming we have to be aware of what bits our integers are using? Do you only need to care of device drivers?
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In windows programming on a PC it may not be as important as in an embedded environment. It can be very important in large applications using structure with lots of integers is can be important from the point of view of memory usage. Why use 96bit intergers when you know at the time of writing the software that the largest numbers you will use will all fit into 16bits. This can mean less disk swapping and faster offset calculations and for embedeed systems, where memory can be a scarse resource, less memory usage, and possibly better performace overall.
There are other considerations but that's the one I have been confronted with mostly.
Happy programming!!
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First of all, when using 16 bit integers on 32 bit machines compiler generates bigger __16_bit__ code (which of course executes slower than that 32 bit one).
Second of all, 16 bit integer is not faster due to smaller size. Register size is rather 32 bit.
So when writing 32 bit application, do not use short, __int16 and so on, use 32 bit integers.
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Hello. Could anybody redirect me to a tutorial, or tell me, how to connect
to a running instance of IE? Because I want to pull back the current web page
im at (or user).
Thanks,
Caleb 
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I retrieve ERROR_SUCCESS in RegSaveKey, but file is zero lenght
What wrong I do?
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Hello , I've got small problem ... Probably somebody can help ?
Here is a problem :
For example , I have Main.cpp ... I added Appendix.cpp and appendix.h files to my project ... I have definition of "float aaa" in .CPP and "extern float aaa" in .H file (Is it RIGHT ?) ... Also in appendix.cpp I described procedure "void Twice()" that make aaa*=aaa;
So - I CAN'T SAVE DATA INTO aaa FROM MAIN.CPP !
I CAN DO IT ONLY FROM Appendixies ...
Only I can do from main.cpp is to read 'aaa' - result of Twice()...
Probably I did something WRONG ? or I need to add something ?
Please Help !!!
P.S.
***
Appendix.CPP
---
#include "stdafx,h"
#include "appendix.h"
float aaa;
void Twice()
{
aaa=1.5;
aaa*=aaa;
}
***
Appendix.H
---
extern float aaa;
void Twice();
***
Main.CPP
---
#include "appendix.h"
!@*&#*!@
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I'm working on code for a real-time control system. This will sound strange but here goes. I've built classes for all the elements of the control (i.e. digital filters and related components). Each of then descends from a base class (Tsignalprocessor) which supports linking actions and data between them. I want to read a script (run time) then instantiate and configure the various components based upon the script. I also want to be able to insert/delete/reconfigure components at run time. To do this I'd like to use a dynamically allocated block of pointers (to each instantiated component). In straight C this was easy (just declare as void then cast pointer). How can I do this in C++? I understand how to get RTTI info, but how do I typecast the pointer (since I want to draw from a block of pointers and point to different classes)? Please email any answers (as well as post here) to me at BobBain@MaritimeDynamics.com
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Ok, this is not an answer - just a 'hey what a neat problem' reply. 
The only difference between C and C++ in this area is that C++ enforces typechecking on parameters passed to a function. So you can, in C, pass a void * to a method and then let that method figure out what it is (if need be).
In C++, there's probably a few workarounds - including overloads of a fn for each type that might be received, IDing the classes in the array by first casting them to the base then retrieving an ID denoting their type etc.
I get a feeling that you could somehow modify the C code to work, involving some ugly casting, but that there's probably a creation pattern that covers this.
Hmmm...
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