Re: Is there a way to detect if the program I'm about to launch already running? - C / C++ / MFC Discussion Boards

12-Oct-01 8:10

I want the Check Box to have the same "grey" background as the Dialog which contains it -- i.e. no white background, no border around the check box.

I hope this won't be impossible or have to resort to display a bitmap.

Thanks.
Johnny

Re: CButton/CWnd properties

Tomasz Sowinski13-Oct-01 1:15

Tomasz Sowinski

13-Oct-01 1:15

Derive your class from CWnd and call DrawFrameControl in OnPaint handler. DrawFrameControl can draw many UI elements, some combination of flags should give you just checkmark on standard background. No bitmap required.

Tomasz Sowinski -- http://www.shooltz.com

Re: CButton/CWnd properties

Andrew Peace12-Oct-01 8:22

Andrew Peace

12-Oct-01 8:22

Hi,

Just use a picture control with an icon - that way the background will be see-through. Then use ShowWindow(SW_SHOW / SW_HIDE) to show or hide the control.

--
Andrew.

Re: CButton/CWnd properties

12-Oct-01 9:22

Thanks.

I guess I was intimidated by using a graphic.

John

DAO with Access 2000 DB

Chris Klecker12-Oct-01 3:53

Chris Klecker

12-Oct-01 3:53

I have a DB in Access 2000 for which I'm trying to access from a VC++ executable using DAO. When I try to query the DB I get a dialog asking me to select a data source. If I convert the database back to a prior version which I believe is 97 format, it works fine. Might anyone know why I get the data source dialog and how I might be able to get these queries to work with a 2000 version of the DB?

Also, is it possible to convert a 2000 DB to 95? I see that Access says it can convert back to a prior but I'm wondering if this prior version is 97 and not 95.

Thanks!
Confused | :confused:

"Save a tree, use Email!"

Re: DAO with Access 2000 DB

Tomasz Sowinski12-Oct-01 4:16

Tomasz Sowinski

12-Oct-01 4:16

Check KB article Q236991.

Basically, if you're linked to MFC DLL, this should be enough to enable DAO 3.6:

AfxGetModuleState()->m_dwVersion = 0x0601; 
AfxDaoInit();

There's C++ Q&A column in Jan'2000 issue of MSJ that also describes this.

Tomasz Sowinski -- http://www.shooltz.com

Is there a way to detect if the program I'm about to launch already running?

12-Oct-01 2:53

Hi all,

Is there a way to detect if the program I'm about to launch already running?

In other words, I don't want to have more than one of the same application running. So far, I've tried EnumProcesses() and other
good stuffs but have no luck. I have a function called ProcessExist(),shown below, to detect if the specified app is currently running.

This function works if I call it from another application.
The problem is that if I call ProcessExist() inside my application, that application is ALREADY running, so ProcessExist() doesn't solve the problem.

Any help is appreciated.

Thanks

//////////////////////////////////////////////////////////
CString CMyProcess::GetProcessName(DWORD pid)
{
char ProcName[MAX_PATH]=_T("unknown");
CString Name;

HANDLE handle=OpenProcess(PROCESS_QUERY_INFORMATION|PROCESS_VM_READ,FALSE,pid);
if (handle)
{
HMODULE hMod;
DWORD needed;
if (EnumProcessModules(handle,&hMod,sizeof(hMod),&needed))
{
GetModuleBaseName(handle,hMod,ProcName,sizeof(ProcName));
Name = ProcName;
}
CloseHandle(handle);
}
return Name;
}

BOOL CMyProcess::ProcessExist(LPCTSTR lpProcName, CString &fullpathname, DWORD &pid)
{
DWORD pids[1024];
DWORD bytes_needed=0;
DWORD num_procs=0;
BOOL result = FALSE;
CString str;

if (EnumProcesses(pids,sizeof(pids),&bytes_needed))
{
num_procs = bytes_needed / sizeof(DWORD);
for (DWORD i=0; i

Re: Is there a way to detect if the program I'm about to launch already running?

rachna12-Oct-01 4:03

rachna

12-Oct-01 4:03

A small thing which you can do is as follows.At the beginning of the
program call a small function say init() which creates a mutex ,if that
mutex already exists that means you have another instance running.

BOOL init()
{
HANDLE mutex = CreateMutex(NULL, FALSE, "mutexname");
if(mutex == NULL)
return FALSE;

if (GetLastError() == ERROR_ALREADY_EXISTS)
{
MessageBox("Another instance is already running.");
return FALSE;
}

return TRUE;

}

Re: Is there a way to detect if the program I'm about to launch already running?

12-Oct-01 4:08

Thanks Rachna. I'll try that.

Re: Is there a way to detect if the program I'm about to launch already running?

Nish Nishant12-Oct-01 22:21

Nish Nishant

12-Oct-01 22:21

Hello

You can use this class [from MSDN]

#ifndef LimitSingleInstance_H
#define LimitSingleInstance_H

#include <windows.h> 

class CLimitSingleInstance
{
protected:
  DWORD  m_dwLastError;
  HANDLE m_hMutex;

public:
  CLimitSingleInstance(TCHAR *strMutexName)
  {
    //be sure to use a name that is unique for this application otherwise
    //two apps may think they are the same if they are using same name for
    //3rd parm to CreateMutex
    m_hMutex = CreateMutex(NULL, FALSE, strMutexName); //do early
    m_dwLastError = GetLastError(); //save for use later...
  }
   
  ~CLimitSingleInstance() 
  {
    if (m_hMutex)  //don't forget to close handles...
    {
       CloseHandle(m_hMutex); //do as late as possible
       m_hMutex = NULL; //good habit to be in
    }
  }

  BOOL IsAnotherInstanceRunning() 
  {
    return (ERROR_ALREADY_EXISTS == m_dwLastError);
  }
};
#endif

hope this helps

Nish

about CString

Maer72712-Oct-01 2:35

Maer727

12-Oct-01 2:35

How to create a string with the identifier "IDS_STR1"?

I use the following statement to declare IDS_STR1.
#define IDS_STR1 1;

Thanks.
Maer

Re: about CString

Michael P Butler12-Oct-01 2:42

Michael P Butler

12-Oct-01 2:42

Are you talking about the string table in resources?

You can use a string table resource with CString via the LoadString method.

CString sTemp = _T("");

sTemp.LoadString(IDS_STR1)

Michael

Re: about CString

Maer72713-Oct-01 1:24

Maer727

13-Oct-01 1:24

Thanks Michael!

Re: about CString

Jim A. Johnson12-Oct-01 2:44

Jim A. Johnson

12-Oct-01 2:44

CString strWhatever(MAKEINTRESOURCE(IDS_STR1));

or

CString strWhatever;
strWhatever.LoadString(IDS_STR1);

Re: Use the string table.

Masaaki Onishi12-Oct-01 4:17

Masaaki Onishi

12-Oct-01 4:17

Hello, the codegurus around the world.;)

We can create the string with IDS_STR1 in the string table of the resource section
in Visual studio. Roll eyes | :rolleyes:

Have a nice day!

-Masaaki Onishi-

Re: Use the string table.

Maer72713-Oct-01 1:29

Maer727

13-Oct-01 1:29

Thanks pal.
: )
Maer

How to compile a HTML file into one file

inforix11-Oct-01 23:34

inforix

11-Oct-01 23:34

Any idea to compile some HTML files into one file. especially the pictures.;)

Re: How to compile a HTML file into one file

Paolo Messina12-Oct-01 6:18

Paolo Messina

12-Oct-01 6:18

Open the file with IE5+ and save it as a .mht (something like a multipart email message).
As far as I know you can only open such a file with IE5+, however.

Paolo

------
"airplane is cool, but space shuttle is even better" (J. Kaczorowski)

How to handle scrollbar?

11-Oct-01 23:25

Hello:
In order to display a bmp Image in a dialog box I created a class named "CImageBox" which was derived from CWnd just like "CStatic". "CImageBox" was created with the style "...|WS_HSCROLL|WS_VSCROLL".
Here comes the problem: How to handle the horizontal and vertical scrollbar?
These are my three unsuccessful experiences:
<1>CWnd::GetScrollBarCtrl() always return NULL;
<2>CView::GetScrollBarCtrl() do not seem to be applicative;
<3>I try to handle WM_VSCROLL in "CImageBox":
void CImageBox::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) ;
The parameter "pScrollBar" is always NULL so I can't use the SetScrollPos() member function.
However "CEdit"(MFC) do well in this,but I can't find the source code of CEdit::GetScrollBarCtrl().
Can anybody help me?
Any advice is appreciable.<shawell2000@163.net>

Re: How to handle scrollbar?

Tomasz Sowinski11-Oct-01 23:53

Tomasz Sowinski

11-Oct-01 23:53

You don't need scrollbar controls - any window can display scrollbars which are integral parts of it, just like border or caption.

Use Cwnd methods like Get/SetScrollRange, Get/SetScrollPos, handle WM_VSCROLL/WM_HSCROLL and you'll be OK.

Note that scrollbars will not appear until you set range greater than client area size.

Tomasz Sowinski -- http://www.shooltz.com

RC file compilation fails giving error RC1015

Lakshmi11-Oct-01 20:48

Lakshmi

11-Oct-01 20:48

Hi,

I'm facing a problem with VC++ ver 6.0(MFC), when ever I try to compile rc file it fails giving fatal error RC1015: Cannot open include file 'afxres.h'. Even if I try to create standard simple dialog based application, while compiling the rc file it fails showing above error,I mean to say VC is failing to build all the applications(VC ver 6.0). I checked the environment variables, thinking there might be problem with environment variables setting, ran vcvars32.bat from "program files\Microsoft visual studio\vc98\bin". Even then it gives the same problem saying, "can not open afxres.h".
If any one knows about this problem, please let me know the solution.

Thanks in advance,
Lakshmi.

Re: RC file compilation fails giving error RC1015

Anna-Jayne Metcalfe11-Oct-01 21:47

Anna-Jayne Metcalfe

11-Oct-01 21:47

A couple of obvious things to check:

Is afxres.h still there? Have a look in C:\Program Files\Microsoft Visual Studio\VC98\mfc\include (or your equivalent) and make sure
Your include paths may not be set up correctly. Check to ensure this directory is on the include path inside the IDE

If all else fails, just re-install VC and the problem should go away. Smile | :)

Andy Metcalfe - Sonardyne International Ltd
(andy.metcalfe@lineone.net)
http://www.resorg.co.uk

"I'm just another 'S' bend in the internet. A ton of stuff goes through my system, and some of the hairer, stickier and lumpier stuff sticks."
- Chris Maunder (I just couldn't let that one past Wink | ;)

)

Generate Reports Using Crystal Reports 7 in VC

Statbat11-Oct-01 20:39

Statbat

11-Oct-01 20:39

Hi,

I am trying to generate reports in my VC application using Crystal Reports 7. I have created the .rpt file. Now I need to integrate this file with the VC application. How can I do so?

My object is that report should not be directly printed but first It should be displayed (with all print preview options) and when the user selects print option it then prints to default printer.

Please help.....

Thanks for ur time .....

~Statbat( );

Re: Generate Reports Using Crystal Reports 7 in VC

Masaaki Onishi12-Oct-01 4:26

Masaaki Onishi

12-Oct-01 4:26

Hello, the codegurs around the world.;)

I think that you use Crystal Report ActiveX control in VC++ project.
And after you insert Crystal Report ActiveX conrol by type library,
you can use its function to show the crystal report file.

I hope that you know how to insert Crystal Report ActiveX control to your project. Confused | :confused:

Have a nice day!

-Masaaki Onishi-

Re: Generate Reports Using Crystal Reports 7 in VC

Rashid Thadha12-Oct-01 6:53

Rashid Thadha

12-Oct-01 6:53

go to the developer web site

http://www.crystaldecisions.com/products/dev_zone/

They have various VC++ samples that show you how to do this

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