C / C++ / MFC

31-Jul-05 21:44

I have a problem with printing.
When I print image it's very small on paper, but big on the screen.
So I decide to add code:

int logxPrn=GetDeviceCaps(hPrinterDC,LOGPIXELSX);
int logxScr=GetDeviceCaps(hDisplayDC,LOGPIXELSX);

But this values are same.Why?

int logxPrn=GetDeviceCaps(hPrinterDC,HORZRES);
int logxScr=GetDeviceCaps(hDisplayDC,HORZRES);

This values are too same!!! Confused | :confused:

Can Anyone Help me?

David Crow1-Aug-05 3:25

David Crow

1-Aug-05 3:25

I had a similar problem that required me to use something like:

SetMapMode(hDC, MM_ISOTROPIC);
 
SetWindowOrg(hDC, bitmap_width / 2, bitmap_height / 2);
SetViewportOrg(hDC, GetDeviceCaps(hDC, HORZRES) / 2, GetDeviceCaps(hDC, VERTRES) / 2);
 
SetWindowExt(hDC, bitmap_width, bitmap_height);	
SetViewportExt(hDC, GetDeviceCaps(hDC, HORZRES), GetDeviceCaps(hDC, VERTRES));

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Member 21436381-Aug-05 4:12

1-Aug-05 4:12

DavidCrow Can you explain me
How to use your code and how it works?

David Crow1-Aug-05 5:33

David Crow

1-Aug-05 5:33

Are you using MFC?

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

Member 21436382-Aug-05 5:54

2-Aug-05 5:54

Yes.

How do we read information from a DSN?

David Crow2-Aug-05 6:07

David Crow

2-Aug-05 6:07

Then put this code in the view's OnPrepareDC() method after calling the base implementation:

if (pDC->IsPrinting() != FALSE)
{
    pDC->SetMapMode(MM_ISOTROPIC);
 
    // m_BmpInfo is a BITMAP member variable

    pDC->SetWindowOrg(m_BmpInfo.bmWidth / 2, m_BmpInfo.bmHeight / 2);
    pDC->SetViewportOrg(pDC->GetDeviceCaps(HORZRES) / 2, pDC->GetDeviceCaps(VERTRES) / 2);
 
    pDC->SetWindowExt(m_BmpInfo.bmWidth, m_BmpInfo.bmHeight);	
    pDC->SetViewportExt(pDC->GetDeviceCaps(HORZRES), pDC->GetDeviceCaps(VERTRES));
}

"One must learn from the bite of the fire to leave it alone." - Native American Proverb

bondguru31-Jul-05 21:40

bondguru

31-Jul-05 21:40

Hi all,
I have created a setup for an application. When I perform an upgrade operation using this setup, currently the logon information is read from a file(setup.inf). It includes username, password, servername and database name. Now I don't want to depend on this setup.inf file. Instead at the time of upgradation, the setup should read this information from the DSN already created. If anyone knows how to do this then please tell me.
Thanking You.

Regards,
Harshad

Re: How do we read information from a DSN?

Ritu Kwatra1-Aug-05 1:06

Ritu Kwatra

1-Aug-05 1:06

System DSN are stored in the registry at HKEY_CURRENT_USER/SOFTWARE/ODBC/OBBC.INI

youc can read the DSN named key.

Ritu Kwatra

TabCtrl

Halawlaws31-Jul-05 21:33

Halawlaws

31-Jul-05 21:33

Hi I have a TabCtrl. The user should finish the operation on Tab 1 (press a button in the tab 1) before being able to access Tab 2 and the others.
How can i make this restriction?

/\|-||\/|/\|)

Re: TabCtrl

Anonymous31-Jul-05 23:52

Anonymous

31-Jul-05 23:52

hi On button of Tab1 declare the extern global value set to specific value and on tab2 check that value if u get that allow it or else set the focus to tab1

cheers

hook clipboard!

macro91331-Jul-05 21:28

macro913

31-Jul-05 21:28

I write a program,use the global msg hook.Although the wm_keydown 、wm_mousemove and other msg can hook,but the wm_destroyclipboard、WM_DRAWCLIPBOARD and other clip msg cann't hook.
Can anyone tell me why?How can i to do ? Thanks a lot!
hook = SetWindowsHookEx(
WH_GETMESSAGE,
(HOOKPROC)msghook,
hInstance,
0);

---------------------
if(code < 0)
{ /* pass it on */
CallNextHookEx(hook, code,
wParam, lParam);
return 0;
} /* pass it on */

LPMSG lpEvent = (LPMSG)lParam;
if( lpEvent->message == WM_DESTROYCLIPBOARD)
{

MessageBox(NULL,"click!","click",MB_OK);
nn=FALSE;
}

// Pass the message on to the next hook
return CallNextHookEx(hook, code,
wParam, lParam);

Thread doesnt want to set event?

Member 341989131-Jul-05 21:15

31-Jul-05 21:15

There is modal dialog and on its DoModal() we start a thread

CPBarDlg dlg;
dlg.DoModal();

BOOL CPBarDlg::OnInitDialog()
{
CDialog::OnInitDialog();

// TODO: Add extra initialization here

m_event = CreateEvent(0,true,false,0);
p->event = m_event;
p->quit = 0;
pTH = AfxBeginThread((AFX_THREADPROC)&annthread,p,0,0,0,0);

return TRUE; // return TRUE unless you set the focus to a control
// EXCEPTION: OCX Property Pages should return FALSE
}

void CPBarDlg::OnClose()
{
// TODO: Add your message handler code here and/or call default
p->quit = 1;

WaitForSingleObject(m_event, INFINITE); //returns when m_event in signaled state
//hang here sometimes in Release mode??????

CloseHandle(m_event);
CDialog::OnClose();
}
/////////////////////////////////////////////////////////////////////////////

//////////////////////////////THREAD/////////////////////////////////////////
UINT annthread(LPARAMS p)
{

while(!p->quit)
{
//do some calculations.... req about 10-20ms
}

SetEvent(p->event);
return 0;
}
///////////////////////////////////////////////////////////////////////////////

So in order to end thread before we close CPBarDlg we set p->quit = 1 and wait untill event signaled by thread. But it is not set in thread in Release mode and OnClose() handler start to wait forever for WaitForSingleObject(m_event, INFINITE)??? whats wrong

9ine

S. Senthil Kumar31-Jul-05 23:17

S. Senthil Kumar

31-Jul-05 23:17

Did you declare the quit variable with the volatile modifier?

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Member 34198911-Aug-05 0:12

1-Aug-05 0:12

why? no I didnt. it is just a structure
typedef struct _params
{
int quit;
HANDLE event;
...
...
etc...

}PARAMS p, LPARAMS *p;

and then just:
PARAMS p; //in dialog header file
and
p.quit = 0;
p.event = ...
... etc
beforecreating a thread and passing PARAMS to it.

9ine

S. Senthil Kumar1-Aug-05 0:45

S. Senthil Kumar

1-Aug-05 0:45

You need to declare quit as volatile, which guarantees that the compiler won't do any optimization, which is what is happening in your case. The compiler probably decided that quit was not being modified in the while loop and decided to ignore the check altogether.

Declaring it as volatile prevents the compiler from doing that optimization, my guess is that would solve your problem.

Regards
Senthil
_____________________________
My Blog | My Articles | WinMacro

Member 34198911-Aug-05 1:49

1-Aug-05 1:49

yes I choosed optimization in Release mode, interesting that it prevents checking variable if it is not modified in while loop ) Smile | :)

. I noted that it is terminated about 1 to 4 not terminated cases. Will check it with volatile mod.

9ine

Member 34198911-Aug-05 20:33

how do i call class dll in vb which is created in vc++

1-Aug-05 20:33

Intresting! volatile modifier does not help?
I noticed that thread accesses quit variable only after terminating of OnClose() method where quit variable modified, so what is the purpose of Events after this incident?

9ine

rajesh_kapure31-Jul-05 21:10

rajesh_kapure

31-Jul-05 21:10

hi Please help me.

I have implemented class in DLL(in vc++). now i want to access
that class in vb. how can i do this.
Is it possible to create instance of class in vb.

if anybody knows please tell me about this.

Re: how do i call class dll in vb which is created in vc++

Aamir Butt31-Jul-05 21:50

Aamir Butt

31-Jul-05 21:50

rajesh_kapure wrote:
I have implemented class in DLL(in vc++)

You mean a COM Dll. Right?

You can add a reference to your COM Dll in VB through Project->References. After that you can use the COM Dll's methods.

Steve Mayfield: "Coding in VB is like riding a tricycle...once you figured out how to peddle, its really hard to fall off."

My Articles

Re: how do i call class dll in vb which is created in vc++

rajesh_kapure31-Jul-05 23:08

rajesh_kapure

31-Jul-05 23:08

Thanks Aamir

i already done that thing.

but whenever i add a refference of COM Dll it gives message "can't add
reference to the specified file"

can you give me step or source code for how to create COM DLL in vc++.
so that i will better understand.

Rajesh

Re: how do i call class dll in vb which is created in vc++

Eytukan1-Aug-05 5:28

Eytukan

1-Aug-05 5:28

u got the answer?

v

Re: how do i call class dll in vb which is created in vc++

rajesh_kapure1-Aug-05 17:44

rajesh_kapure

1-Aug-05 17:44

No, Can you tell me step by step how to create COM DLL.
or send me source code for that.

Rajesh

wParam from WM_KEYDOWN to wParam WM_CHAR

Member 214363831-Jul-05 20:59