How to Read a User/System Environment Variable Using c++ - C / C++ / MFC Discussion Boards

Re: initial a string why this new string has strange character at begin

CPallini27-Apr-09 22:58

CPallini

27-Apr-09 22:58

Debugging Release version, built without debugging info, may lead to apparently strange results, I believe.
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: initial a string why this new string has strange character at begin [modified]

Michael Schubert27-Apr-09 23:07

Michael Schubert

27-Apr-09 23:07

You may add yourself to the list of contributers of the "CP's memorable quotes" list. Smile | :)

modified on Tuesday, April 28, 2009 4:20 AM

Re: initial a string why this new string has strange character at begin

CPallini27-Apr-09 23:29

CPallini

27-Apr-09 23:29

Too kind man, too kind, indeed.
Smile | :)

Re: initial a string why this new string has strange character at begin

Perry Holman27-Apr-09 23:23

Perry Holman

27-Apr-09 23:23

Maybe other codes bring memory error.
BTW, you can use CString here.

Welcome to www.softwaretree.net!
This website is generated completely by static html pages transforming technology.
You can find many excellent audio/video tools there!

Re: initial a string why this new string has strange character at begin

CPallini27-Apr-09 23:31

CPallini

27-Apr-09 23:31

Why CString is supposed to behave better than std::string there (everywhere)?
Big Grin | :-D

FelxGrid "help me" [modified]

Benjamin Bruno27-Apr-09 21:54

Benjamin Bruno

27-Apr-09 21:54

Hi How to set Greek characters in FlexGrid cells?I used SetText function ,but it is setting
other characters.

example
If I want to set "λ" in flexgrid cell it is setting "ё" instead

please help

modified on Tuesday, April 28, 2009 5:00 AM

Re: FelxGrid "help me"

Code-o-mat28-Apr-09 0:02

Code-o-mat

28-Apr-09 0:02

Hi, i don't know FlexGrid but here's a general tip: when you specify a font for your cells or maybe for the entire grid, use a greek charset. In the LOGFONT struct there is a member called lfCharSet, if you set this to GREEK_CHARSET, the font mapper will try to give you a font that has greek characters in it. As said, i don't know the Flex Grid so i don't know how you can make it use a certain font but i guess you will know that. I hope this helps somewhat.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Life: great graphics, but the gameplay sux. <

How to Read a User/System Environment Variable Using c++

Mogaambo27-Apr-09 21:50

Mogaambo

27-Apr-09 21:50

How to Read a User/System Environment Variable Using c++.

getenv is not working.

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: How to Read a User/System Environment Variable Using c++

Murugesan G27-Apr-09 22:07

Murugesan G

27-Apr-09 22:07

for Visual C++ try this otherwise getenv will work
using namespace System;
using namespace System::Collections;
int main()
{
Console::WriteLine();
Console::WriteLine( "GetEnvironmentVariables: " );
IDictionary^ environmentVariables = Environment::GetEnvironmentVariables();
IEnumerator^ myEnum = environmentVariables->GetEnumerator();
while ( myEnum->MoveNext() )
{
DictionaryEntry^ de = safe_cast<dictionaryentry^>(myEnum->Current);
Console::WriteLine( " {0} = {1}", de->Key, de->Value );
}
}

Re: How to Read a User/System Environment Variable Using c++

Stephen Hewitt28-Apr-09 1:11

Stephen Hewitt

28-Apr-09 1:11

That's not C++, it looks like Managed C++ (which isn't really C++ but a different language based on it). This is the wrong forum for code like that.

Steve

Re: How to Read a User/System Environment Variable Using c++

Michael Schubert27-Apr-09 22:13

Michael Schubert

27-Apr-09 22:13

One minute of googling turned up this code:

#include <stdio.h>
#include <stdlib.h>
extern char**_environ;
 
int main(int argc, char *argv[], char *envp[])
{
  char **next = _environ;
  
  while (*next) 
  {
    printf("%s\n", *next);
    next++;
  }
  return 0;
}</stdlib.h></stdio.h>

If you want to get the value of a specific variable you can use GetEnvironmentVariable()

Re: How to Read a User/System Environment Variable Using c++

Mogaambo27-Apr-09 23:22

Mogaambo

27-Apr-09 23:22

I had created variable in user section , using the following code

'defining variables
dim objShell, colUserEnvVars

'initializing all variables
Set objShell = WScript.CreateObject("WScript.Shell")
Set colUserEnvVars = objShell.Environment("System")

'Output File for registry information.
colUserEnvVars("rahul") = "rahul"

but i cannot read the same from c++, for this i have to restart the system,

but Wscript.Echo colUserEnvVars("DeloitteAuditShare123") read the value without restarting ths system.

“You will never be a leader unless you first learn to follow and be led.”
–Tiorio

"Coming together is a beginning, staying together is progress, and working together is success." Henry Ford

Re: How to Read a User/System Environment Variable Using c++

V K 227-Apr-09 22:43

V K 2

27-Apr-09 22:43

GetEnvironmentVariable( ) will work from VS2005 onwards. Have you tried that.

Re: How to Read a User/System Environment Variable Using c++

Michael Schubert27-Apr-09 22:50

Michael Schubert

27-Apr-09 22:50

VKupunaram wrote:
from VS2005 onward

This API has been around since Windows NT 3.1 which was released in 1993. What makes you think that it is supported only from VS2005 onwards?

How to clean up an object of CMapStringtoString

V K 227-Apr-09 21:40

V K 2

27-Apr-09 21:40

I am using an object of CMapStringtoString. How should I clean up the map contents in the destructor.

Re: How to clean up an object of CMapStringtoString

Rajkumar R27-Apr-09 22:30

Rajkumar R

27-Apr-09 22:30

you may call CMapStringtoString::RemoveAll, but CMapStringtoString destructor does this. you don't want to delete individual elements in this collection. For reference you may check [COLLECT Sample: Illustrates MFC Collection Classes^]

WinCe Screen shot of windows

vijaywithu27-Apr-09 21:29

vijaywithu

27-Apr-09 21:29

Can Any one please help me to get the screen shot of the windows opened in the desktop on CE Device machine. How would the screen shot be saved as bitmap file in the device machine.

A code snippet would be help ful.

Thanks in Advance

Re: WinCe Screen shot of windows

V K 227-Apr-09 21:47

V K 2

27-Apr-09 21:47

You need to have prnt_scrn.exe for capturing screen shot on a WinCE device.

Syntax of the Print Screen Tool

Prt_scrn [–d NUM] [-s Num1Num2] [–e Num1Num2] filename
Parameters of the Print Screen Tool
-d NUM
Specifies a number of seconds NUM to wait after running the Prt_scrn.exe application before taking the screen shot. The default value for NUM is zero.
-s Num1 Num2
Specifies the location of the upper left vertex of the rectangular region on the screen where to take the screen shot. The values Num1 and Num2 specify, in pixels, the horizontal and vertical coordinates, respectively, of this vertex. The default values for Num1 and Num2 are zero. The default values specify that the upper left vertex is the upper left corner of the screen.
-e Num1 Num2
Specifies the location of the lower right vertex of the rectangular region on the screen where to take the screen shot. The values Num1 and Num2 specify, in pixels, the horizontal and vertical coordinates, respectively, of this vertex. The values for Num1 and Num2 must be greater than the values specified in the -s parameter. The default value for Num1 is the width of the screen in pixels minus one pixel and the default value for Num2 is the height of the screen in pixels minus one pixel. The default values specify that the lower right vertex is the lower right corner of the screen.
filename
Specifies the path and file name of the .bmp file where to save the screen shot. To save the .bmp file to the release directory, add a \release\ prefix to the file name. The filename parameter is a required parameter.
Examples
The following code example shows syntax that instructs the Print Screen tool to take a screen shot on the target device three seconds after running Prt_scrn.exe. This example sends the screen shot to the Snapshot.bmp file in the release directory.
Prt_scrn –d 3 \Release\Snapshot.bmp
The following code example shows syntax that instructs the Print Screen tool to take a screen shot of the (100, 100, 400, 400) screen region on the target device. This example sends the screen shot to the Snapshot.bmp file in the Windows directory on the target device.
Prt_scrn –s 100 100 –e 400 400 \Windows\Snapshot.bmp

Re: WinCe Screen shot of windows

Rajkumar R27-Apr-09 21:50

Rajkumar R

27-Apr-09 21:50

you may use [Windows CE Remote Tools - Remote Zoom-in^] available with SDKs, if you have platform builder you can use [CETK tool - Print Screen ^]

How to add images in visual C++ Library Files

Sakthi.Gs :-)27-Apr-09 21:04

Sakthi.Gs :-)

27-Apr-09 21:04

Hi..
I am new to this code project..

I have doubt on Visual c++..
My task is to scan the image and find the text in visual c++..
Once if i scan the alphabet it should called the library data base....

1.Create data base
2. How to include the images in the data base
3.Should we include the images in library files..
4.How to call the library files..

Could some one help me out Confused | :confused:

....

Thanks

Re: How to add images in visual C++ Library Files

KarstenK27-Apr-09 23:50

KarstenK

27-Apr-09 23:50

You better seperate the images out of the database as separate image files in the desired format. In the database I would only list the relative path (!!!) to the image of an image directory or server.

Consider changing the image storage for the future!!! Dead | X|

Press F1 for help or google it.
Greetings from Germany

How to get the handles of all the windows opened in wince?

ujjawal kumar27-Apr-09 19:59

ujjawal kumar

27-Apr-09 19:59

I want to retrieve handles for all the windows opened in wince machine. Using my application i need to retrieve the handle for the windows that has been opened in desktop and list the title of those windows in a list view .
Thanks in Advance.

Re: How to get the handles of all the windows opened in wince?

Rajkumar R27-Apr-09 20:43

Rajkumar R

27-Apr-09 20:43

have a look into [EnumWindows^] and [GetWindowText^] and search CP for ListView

Re: How to get the handles of all the windows opened in wince?

ujjawal kumar27-Apr-09 22:07

ujjawal kumar

27-Apr-09 22:07

I have tried with the folowing code snippet.Still i am not able to retrieve the handle for the window.
WNDENUMPROC lpEnumFunc = &EnumWindowsProc;
TCHAR szName[50];
HWND hTempWnd = NULL;
lpEnumFunc(hTempWnd,lParam);
if(EnumWindows(lpEnumFunc ,LPARAM(hWnd)))
MessageBox(hWnd,L"EnumWindows Successful",NULL,0);
lpEnumFunc(hTempWnd,lParam);

GetWindowText(hTempWnd,szName,50);
MessageBox(hTempWnd,szName,szName,0);

Re: How to get the handles of all the windows opened in wince?

Rajkumar R28-Apr-09 1:52

Rajkumar R

28-Apr-09 1:52

Well, well try, If that API was supposed to work as per your understanding there are possible risks being caught in an infinite loop or referencing a destroyed window handle.

Call Back functions of an Windows API are not that supposed to be called by you.

struct MYLISTVIEW
{
};

BOOL CALLBACK EnumWindowsProc(HWND hwnd, LPARAM lParam)
{
#define MAX_TEXT_LEN 256
	MYLISTVIEW *plvData = (MYLISTVIEW *)lParam;
	if (plvData)
	{
		TCHAR szWndText[MAX_TEXT_LEN] = _T("");

		LONG lStyle = GetWindowLong(hwnd, GWL_STYLE);
		LONG lExStyle = GetWindowLong(hwnd, GWL_EXSTYLE);

		// filter the window handles depending on your need
		if (IsWindowVisible(hwnd) && !GetParent(hwnd) && hwnd != GetDesktopWindow() && (
			/*lExStyle & WS_EX_APPWINDOW || */
			!(lExStyle & WS_EX_NOACTIVATE || lExStyle & WS_EX_TOOLWINDOW)))
		{			
			RECT rc = {0};
			GetWindowRect(hwnd, &rc);
			if (rc.bottom - rc.top && rc.right - rc.left)
			{
				GetWindowText(hwnd, szWndText, MAX_TEXT_LEN);

                                // add the text to your view
				AddWndTextToListView(plvData, szWndText);
			}			
		}
	}
	return TRUE;	
}

MYLISTVIEW g_lvData;

void AddOpenedWindowsToListView()
{
	EnumWindows(EnumWindowsProc, (LPARAM)&g_lvData);
}

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.