C / C++ / MFC

Re: Which window has the focus

3-Dec-09 18:21

Use GetFocus to get the handle to the window that has the focus.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

SujayG3-Dec-09 18:31

SujayG

3-Dec-09 18:31

HI ,

GetFocus does return me the correct window handle also.

I had tried with GetFoucs,GetActiveWindow, none of them are working

Re: Which window has the focus [modified]

Madhu Nair3-Dec-09 19:28

Madhu Nair

3-Dec-09 19:28

Superman, Does the GetTopWindow help in this regard ?

Or, What about using File Change Notification[^] to get the changes user made in file system ? Not sure these are relevant for the OP.

modified on Friday, December 4, 2009 1:37 AM

Re: Which window has the focus

vasu_sri3-Dec-09 20:18

vasu_sri

3-Dec-09 20:18

i have tried what u have done .
that GetFocus function is retirning is NULL when iam calling in thread.

so, that i tried one more function GetForegroundWindow();
this also returns HWND.

CWnd *wnd=NULL;
HWND hWnd = NULL;
CString strwndName;

while (1)
{
    hWnd=::GetFocus();
    if(hWnd==NULL)
        hWnd=GetForegroundWindow();
    GetWindowText(hWnd,strwndName.GetBuffer(),20);
    //displaying in edit box.
    dlg->m_ed1.SetWindowText(strwndName);
}

just try it.. it will be work...

Regards,
Srinivas

Is there a convenient way to change a System environment variable in MFC?

Erik3-Dec-09 18:16

Erik

3-Dec-09 18:16

Hi,

I'm using VS 2005 and MFC, and I want to modify a system environment variable. So I looked up in the MSDN help and found that it is easy to set a user environment variable. However, for changing a system variable, the help says:

"Calling SetEnvironmentVariable has no effect on the system environment variables. The user can add or modify system environment variables using the Control Panel. To programmatically add or modify system environment variables, add them to the HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Session Manager\Environment registry key, then broadcast a WM_SETTINGCHANGE message. This allows applications, such as the shell, to pick up your updates. Note that environment variables listed in this key are limited to 1024 characters."

I understand that, but find this way very error-prone and complicated. Is there really no easy, straightforward way to do such a simple thing as setting a system variable? No other methods availbale in MFC?

Thanks alot

Re: Is there a convenient way to change a System environment variable in MFC?

T21023-Dec-09 19:27

T2102

3-Dec-09 19:27

That is a better method than I am aware of. I typically modify the registry via code and reboot the computer when necessary.

Re: Is there a convenient way to change a System environment variable in MFC?

Erik3-Dec-09 23:36

Erik

3-Dec-09 23:36

Thanks alot, I have now implemented it that way, and I also send the message this way that the environment has changed:

int nVal = SendMessageTimeout(HWND_BROADCAST, WM_SETTINGCHANGE,0,(LPARAM)(_T("Environment")),SMTO_BLOCK | SMTO_ABORTIFHUNG | SMTO_NOTIMEOUTIFNOTHUNG, 5000, &dwReturnValue);

That works for all other processes, i.e. all the other processes that I start after I sent this message know the newly created system variable, and I do not have to restart my system.

However, the process that is currently running, i.e. the process that I used to set this variable is NOT aware of it, so if I make a call to GetEnvironmentVariable after setting it, I do NOT get it. I only get it if I restart the process.

is there a way to know that variable in the same process right after it has been created?

Re: Is there a convenient way to change a System environment variable in MFC?

David Crow4-Dec-09 3:41

why RES file contain ICO file path?

4-Dec-09 3:41

Erik wrote:
is there a way to know that variable in the same process right after it has been created?

Is it responding to the WM_SETTINGCHANGE message?

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

HOW WHAT3-Dec-09 17:06

HOW WHAT

3-Dec-09 17:06

use DDK, build resource file (only a ICO file) , but sys file( or res file ) contain "c:\sample\resouce\sample.ico" strings, why ? how to remove it? thanks.

Re: why RES file contain ICO file path? [modified]

Adam Roderick J3-Dec-09 17:14

Adam Roderick J

3-Dec-09 17:14

It is path of the resource in local machine.
res file is intermediate file so wont be a problem just refer [^]
It wont be problem as far as i know.

Величие не Бога может быть недооценена.

modified on Friday, December 4, 2009 12:03 AM

error LNK2001: unresolved external symbol _wWinMain@16

includeh103-Dec-09 15:32

includeh10

3-Dec-09 15:32

an unicode MFC project worked well before (VC6), but after I added some COM issues and #include <atlbase.h>, I got compile error:

libcmt.lib(wwincrt0.obj) : error LNK2001: unresolved external symbol _wWinMain@16

project settings are default except unicode info.

how to solve the problem?

thanks

modified on Thursday, December 3, 2009 9:39 PM

Re: error LNK2001: unresolved external symbol _wWinMain@16

David Crow3-Dec-09 16:02

Re: error LNK2001: unresolved external symbol _wWinMain@16

3-Dec-09 16:02

Have you checked here?

Adam Roderick J3-Dec-09 17:06

Adam Roderick J

3-Dec-09 17:06

Did u checked with the msdn on your machine with this link error.
Set 'wWinMainCRTStartup' on Project Settings-->Link-->Output-->Entry-point symbol:

Величие не Бога может быть недооценена.

load bitmap into memory [modified]

transoft3-Dec-09 11:54

transoft

3-Dec-09 11:54

Hi
My software needs a background bitmap image. User will frequently scroll the image. I want to load the bitmap image into memory. So the display performance will improve better.

What function will load bitmap into memory? I am using GDI plus.

void MyView::OnPaint( ... )
{
...
  Gdiplus::Graphics gr(dc);
  gr.SetPageUnit(Gdiplus::UnitPixel);
  gr.DrawImage(pBmp, p, 3);
...
}</pre>

Thanks, 

<div class="ForumMod">modified on Thursday, December 3, 2009 6:00 PM</div>

Re: load bitmap into memory

«_Superman_»3-Dec-09 13:04

Re: load bitmap into memory

3-Dec-09 13:04

You can use the Image class to load a bitmap from a file.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

transoft4-Dec-09 2:18

transoft

4-Dec-09 2:18

I already load image from a file. But it displays very slow. I want to load data into memory.

Thanks

How to measure program speed?

Grimes3-Dec-09 6:31

3-Dec-09 6:31

Hi there

Can someone please help me. I am looking for a way to measure the speed of my program's execution. I am busy writing a simulation that needs to run as fast as possible and I want to make sure that the algorithms used are the fastest possible. Is there a way or a tool that can be used to measure the speed, like the amount of CPU clock cycles needed to complete an algorithm.

thank you in advance.

Riaan.

KOM UIT DAAAAA!!!

David Crow3-Dec-09 6:38

3-Dec-09 6:38

Have you tried the profiler that comes with Visual Studio?

Grimes3-Dec-09 6:45

3-Dec-09 6:45

I am not that familiar with visual studio, but I see there is a reference in the help to the profiler. It seems that it would be able to do what I want. I will look in to the profiler.

Thanks for pointing me in the right direction!

KOM UIT DAAAAA!!!

«_Superman_»3-Dec-09 8:19

3-Dec-09 8:19

Not sure if this is what you want but you could use high resolution timer functions like QueryPerformanceCounter/QueryPerformanceFrequency before and after a piece of executing code and compare their values.

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Grimes3-Dec-09 9:47

3-Dec-09 9:47

Hi
How would one use this?

QueryFrequencyCounter(Begin)
...CODE...
QueryFrequencyCounter(END)
TIME = END - BEGIN;

What is the unit of the counter? milliseconds or microseconds or clock cycles?

I will give it a try, thank you!

KOM UIT DAAAAA!!!

David Crow3-Dec-09 9:55

3-Dec-09 9:55

Grimes wrote:
What is the unit of the counter? milliseconds or microseconds or clock cycles?

See here and here.

«_Superman_»3-Dec-09 9:59

3-Dec-09 9:59

Here is an interesting blog - QueryPerformanceCounter counts elapsed time, not CPU cycles[^]

«_Superman_»
I love work. It gives me something to do between weekends.

Microsoft MVP (Visual C++)

Member 41945933-Dec-09 15:12

Member 4194593

3-Dec-09 15:12

Check the Masm32 forum. In the Laboratory there is a huge amount of information about timing, a Macro to set up the timing, and what it takes to get accurate results.

Grimes3-Dec-09 21:37