C / C++ / MFC Discussion Boards

Re: Calling Webservice through VC++

sunit51-Aug-05 3:06

sunit5

1-Aug-05 3:06

this may help u

http://www.codeproject.com/internet/amhttputils.asp

Re: Calling Webservice through VC++

Ravi Bhavnani1-Aug-05 7:41

Ravi Bhavnani

1-Aug-05 7:41

Also see this[^] article.

/ravi

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Windows Message Hook Crashes

nick1131-Jul-05 19:02

nick11

31-Jul-05 19:02

I am trying to write a DLL that will allow my visual basic application to receive Window messages. Problem is, when my DLL trys to register the hook, it crashes. Here is the code to my DLL:

////////// Header Files //////////
#include <windows.h>
#include <string.h>
#include "dllutil.h"
#include <winuser.h>

#pragma data_seg ("GlobalData")

long CallBackFunctionPtr =0;
HANDLE DLLHandle =0;
HHOOK HandleToHook =0;
long VBFunctionPtrAddress =0;

#pragma data_seg()

#pragma comment(linker, "/section:GlobalData,RWS")

//end of Global Memory setup

//This is my Generic Hook Function
LRESULT CALLBACK WindowsMessageMonitorHook(int nCode, WPARAM wParam,LPARAM lParam)
{

tagCWPSTRUCT *CPWStructPtr;
//Initlize the pointer not sure if this is correct.
CPWStructPtr = (tagCWPSTRUCT *)lParam;

//this is how call vb back
typedef void (__stdcall *FNPTR)(long x);
FNPTR FunctionCall;

if (nCode == HC_ACTION)
{

//Send Message Back to VB routine
FunctionCall = (FNPTR)VBFunctionPtrAddress;
FunctionCall((long) CPWStructPtr->message);

}

return CallNextHookEx(HandleToHook,nCode,wParam,lParam);

}

HHOOK StartCallBack()
{
//debug message - I can see this message displayed OK
::MessageBox(NULL,"Set Windows Hook","C++ DLL",0);

//but when I single step on this next line, it crashes
HandleToHook = SetWindowsHookEx(WH_CALLWNDPROCRET,
WindowsMessageMonitorHook,
(HINSTANCE)DLLHandle, 0);

//I never see this message.

//Even if I type case WindowsMessageMonitorHook as
//HOOKPROC I get the same resutls.

//I never see this message.
::MessageBox(NULL,"Hooks Have been set","C++ DLL",0);

return HandleToHook;
}

// Receives the address of a Visual Basic function and calls
// it.
extern "C" HHOOK __declspec(dllexport) __stdcall CALLBACK
CallBackExample(long Addr1)

{

HHOOK HookResults;

//Store in global variable
VBFunctionPtrAddress = Addr1;

//Startup MessageMonitorHook
HookResults = StartCallBack();

if (HookResults == 0)

{
::MessageBox(NULL,"Start Hook Results =
0","C++ DLL",0);
}
else
{
::MessageBox(NULL,"Start Hook Results not
zero.","C++ DLL",0);
}

return HookResults;

}

extern "C" BOOL __declspec(dllexport) __stdcall CALLBACK
StopWindowMonitorHook()
{

BOOL Results;

Results = UnhookWindowsHookEx(HandleToHook);

return Results;

}

BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)

{

//save dll handle in global memory
DLLHandle = hModule;

switch(ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:

break;
case DLL_PROCESS_DETACH:

break;
}

return TRUE;
}

Any Idea why it crashes?

Re: Windows Message Hook Crashes

Alexander ^M.,1-Aug-05 1:08

Alexander ^M.,

1-Aug-05 1:08

A little tip first: Call CallNextHookEx(HandleToHook,nCode,wParam,lParam); at the beginning of the hook function, else it could cause kinda deadlock for every application running.

Don't try it, just do it! Wink | ;-)

Re: Windows Message Hook Crashes

nick111-Aug-05 17:49

nick11

1-Aug-05 17:49

I tried it, no help. It never makes it to the HOOK call back function. So it dies on the SetWindowsHookEx function.

It dies right here:
HandleToHook = SetWindowsHookEx(WH_CALLWNDPROCRET,
WindowsMessageMonitorHook,(HINSTANCE)DLLHandle, 0);

Build MFC

LiYS31-Jul-05 17:03

LiYS

31-Jul-05 17:03

Is anybody knows how to rebuild MFC files under the folder "Microsoft Visual Studio\VC98\MFC\SRC", I know roughly there are two processes involved, one is to add the "Microsoft Visual Studio\VC98\Lib" to the "path" Environment variable, the other is to nmake certain makefile!But haven't seceed yet!

Re: Build MFC

Christian Graus31-Jul-05 20:04

Christian Graus

31-Jul-05 20:04

I don't know that you can, and I'm sure that you shouldn't. If you want to replace MFC, you should do so explicitly. Changing MFC, and calling it MFC42.dll is a DISASTEROUS idea.

Christian Graus - Microsoft MVP - C++

Re: Build MFC

Alexander ^M.,1-Aug-05 1:17

Alexander ^M.,

1-Aug-05 1:17

You can: There is a readme.txt in the atlmfc\src path, read it, there are the instructions how to re-compile MFC and ATL.

Don't try it, just do it! Wink | ;-)

Execute Button

Ista31-Jul-05 16:14

Ista

31-Jul-05 16:14

I have a handle to a button from an external application.

I want to fire that button on that app.

what API call would I use?

Maybe send message? Im not sure?

The app i'm calling is an MFC app and using spy++ the says its "Button"
and I already found the button and window using FindWind and FindWindowEx.

thanks
nick

I'm not an expert yet, but I play one at work. Yeah and here too.

Re: Execute Button

Ista1-Aug-05 9:28

Ista

1-Aug-05 9:28

forget it. I figured it out.

I'm not an expert yet, but I play one at work. Yeah and here too.

Dameged files

Aqueel31-Jul-05 15:41

Aqueel

31-Jul-05 15:41

I wanted to use source file from the article "A Rich Edit Control That Displays Bitmaps and Other OLE Objects"
By Mike O'Neill

but the zip file is dameged or currupted. Is there anyone who has correct file?. If yes then please send me that file on
aqueelmirza@hotmail.com or aqueelmirza@yahoo.com

Thank you

Aqueel A. Mirza

We Believe in Excellence

Re: Dameged files

Christian Graus31-Jul-05 20:05

Christian Graus

31-Jul-05 20:05

Ask the author.

Christian Graus - Microsoft MVP - C++

How to access the I/O port under Windows2000

pantao55131-Jul-05 15:23

pantao551

31-Jul-05 15:23

I know that in Windows95, we use the function _outp and _inp to access the I/O port. But they can't be used in Windows2000. What can I do? Should I have to use some software to develop a driver? Confused | :confused:

Re: How to access the I/O port under Windows2000

Abbas_Riazi31-Jul-05 20:05

Abbas_Riazi

31-Jul-05 20:05

You must develop a kernel mode driver or may be using the already exist driver such as WinIO.

Best regards,
A. Riazi

Re: How to access the I/O port under Windows2000

Marc Soleda31-Jul-05 20:53

Marc Soleda

31-Jul-05 20:53

You can use CreateFile & WriteFile [^]
to access to serial port.

Marc Soleda

... she said you are the perfect stranger she said baby let's keep it like this... Tunnel of Love, Dire Straits.

Status bar problem

TEOlivier31-Jul-05 10:57

TEOlivier

31-Jul-05 10:57

When I create a MFC application using the wizard and choose it to be maximized and with no maximize button the status bar seem to be misplaced (below the windows task bar?). When I hide my windows task bar and un-hide it again then the status bar is correctly placed. Help appreciated. Thanx

Images in Rich edit

Aqueel31-Jul-05 8:06

Aqueel

31-Jul-05 8:06

Can a rich edit control show images and background colors used in .rtf file.

We Believe in Excellence

Re: Images in Rich edit

Trollslayer31-Jul-05 8:57

Trollslayer

31-Jul-05 8:57

This[^] one can !
A messaging application perhaps ?

Elaine Rose | [Rose]

The tigress is here Big Grin | :-D

Trouble getting device context

theFrenchHornet31-Jul-05 7:41

theFrenchHornet

31-Jul-05 7:41

I don't know how to correctly acquire the device context for a control. If I put similar code in the OnCtlColor routine where a pointer to the device context is provided, the code works. However, when I try setting the device context, the code doesn't work. Two samples are provided - the first is the code that doesn't work. I appreciate any help fixing it. Thank-you.

This code compiles and runs without error, but does not achieve the color change. (c_navValid is a text box control)

LOGFONT lf;
CDC* dc = new CDC;
dc->Attach(c_navValid.GetDC()->m_hDC);
         
GetFont()->GetObject(sizeof(lf), &lf);
font.CreateFontIndirect(&lf);

dc->SelectObject(&font);
dc->SetTextColor(RGB(0,100,0));
font.DeleteObject();

This code works.

HBRUSH CNavDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
 W_Position_Data_Type* pPositionMsg;
 pPositionMsg = (W_Position_Data_Type*)&CInMsgs::wPositionMsg;
	
 HBRUSH hbr = CPropertyPage::OnCtlColor(pDC, pWnd, nCtlColor);

 if (pWnd->GetDlgCtrlID() == IDC_NAV_VALID)
 {
   if (pPositionMsg->Mode_Word.Nav_Valid)
   {
     LOGFONT lf;
     GetFont()->GetObject(sizeof(lf), &lf);
     font.CreateFontIndirect(&lf);
     pDC->SelectObject(&font);
     pDC->SetTextColor(RGB(0,100,0));
     font.DeleteObject();
   }
 }

Re: Trouble getting device context

Michael Dunn31-Jul-05 19:56

Michael Dunn

31-Jul-05 19:56

Use CClientDC or CWindowDC to get a DC for a window. Use the former to draw in the window's client area only, or the latter if you need to draw in the non-client area too.

--Mike--
Visual C++ MVP Cool | :cool:

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Wizard needs food, badly!

Re: Trouble getting device context

theFrenchHornet1-Aug-05 5:23

theFrenchHornet

1-Aug-05 5:23

Could you please show me the code? To use CClientDC I need a pointer to a window. How do I convert the static control to a window pointer? cCliendDc dc(c_navValid); I know isn't correct. What parameter do I pass to CClientDC to get a dc for the control? Thanks.

Embedding Text into PDF

Abbas_Riazi31-Jul-05 1:16

Abbas_Riazi

31-Jul-05 1:16

Does anyone know how can I embedd some text into an existant PDF that can indexed by search engines?
I want to hide the embedded text but search engines can index it.

Best regards,
A. Riazi

Finding the modem

Y_R30-Jul-05 23:19

Y_R

30-Jul-05 23:19

Hello,

Can anyone know how can I query windows for its devices.

What I mean is that my program needs to know which modems are installed on the pc and thier ports, etc..

The windows device manager is a good example, I want to know how to get data the device manager displays.

Thanks

Y.R.

Re: Finding the modem

Abbas_Riazi31-Jul-05 1:18

Abbas_Riazi

31-Jul-05 1:18

See my articles:

- Enumerate Installed Devices Using Setup API[^]

- Enumerate Properties of an installed Device[^]

Best regards,
A. Riazi

Re: Finding the modem

Y_R31-Jul-05 10:32

Y_R

31-Jul-05 10:32

Thank you very much.

After posting this message I searched in code project and indeed got to your article "Enumerate Installed Devices Using Setup API[^]". I loved it very much very intresting.

I will read the second one now.

Regards
Y.R.

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