C / C++ / MFC

23-Jul-02 12:10

Check Robert Pittenger's article Add a Help Button to a MessageBox, which replaces AfxMessageBox with a home made version using ::MessageBoxIndirect. Altough not directly supported, the source code in the article shows where you should insert the information necessary to change the predefined icon.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

syntax error : 'catch'

moredip23-Jul-02 6:46

23-Jul-02 6:46

Can anyone tell me why the following code causes compile errors?

try
{
	int foo = 1+1;
} catch(...)
{
	int bar = 11;
}

error C2059: syntax error : 'catch'
error C2143: syntax error : missing ';' before '{'

I have exception handling turned on (command line option /GX) in the project settings.

Any ideas?

TIA,

Pete

Scott H. Settlemier23-Jul-02 7:03

Scott H. Settlemier

23-Jul-02 7:03

Is your source file named with a .cpp extension?
If it is .c, I think VC++ will assume it is to be
compiled as plain c code.

moredip23-Jul-02 7:10

23-Jul-02 7:10

Nope, it's got a .cpp extension.

What's confusing me is that it seems to have no problem with the try block, although that may be due to the way the compiler is parsing the file.

Joaquín M López Muñoz23-Jul-02 7:17

23-Jul-02 7:17

It shouldn't be causing any error. Can you provide more info about where this piece of code is inserted?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moredip23-Jul-02 7:27

23-Jul-02 7:27

Well, the orginal problem was from some code in the depths of MS's STL code, namely INCLUDE\xstring....

template<class _E,
	class _Tr = char_traits<_E>,
	class _A = allocator<_E> >
	class basic_string {
...
...
...
		_TRY_BEGIN
			_S = allocator.allocate(_Ns + 2, (void *)0);
		_CATCH_ALL
			_Ns = _N;
			_S = allocator.allocate(_Ns + 2, (void *)0);
		_CATCH_END

with the following defines in INCLUDE\xstddef

#define _TRY_BEGIN try {
#define _CATCH(x)  } catch (x) {
#define _CATCH_ALL } catch (...) {
#define _CATCH_END }

The errors I get are:

C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\xstring(527) : error C2059: syntax error : 'catch'
        C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\xstring(521) : while compiling class-template member function 'void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Copy(unsigned int)'
C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\xstring(527) : error C2143: syntax error : missing ';' before '{'
        C:\Program Files\Microsoft Visual Studio\VC98\INCLUDE\xstring(521) : while compiling class-template member function 'void __thiscall std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >::_Copy(unsigned int)'

I haven't had any problems with the STL before, but the project I'm trying to compile is a .dll for use by DirectShow, so it has some wierd project settings. I can't really explain what is wierd about them, as I don't understand them too well (the project is based on a sample from the DirectX documentation).

Does that help? Any more info you need?

Pete

Joaquín M López Muñoz23-Jul-02 7:37

23-Jul-02 7:37

Does that help? Any more info you need?

Could you please post the beginning of the .cpp where this is included (implicitly or explicitly)?

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moredip23-Jul-02 7:48

23-Jul-02 7:48

//------------------------------------------------------------------------------
// File: CenWriter.cpp
//
// Desc: MODIFIED DirectShow sample code - Implementation file for the CenWriter
//       and CenWriter filters
//
//------------------------------------------------------------------------------

#include "CenFilter.h"
#include < initguid.h >    // declares DEFINE_GUID to declare an EXTERN_C const.

#include "../vss/fdckid.h"

//------------------------------------------------------------------------------
// File: CenFilter.cpp
//
// Desc: MODIFIED DirectShow sample code - Implementation file for the CenReader
//       filters
//
//------------------------------------------------------------------------------

//#include < streams.h >  // Active Movie (includes windows.h)

#include "CenFilter.h"
#include <initguid.h>    // declares DEFINE_GUID to declare an EXTERN_C const.
#include "../vss/fdckid.h"
#include "../vss/array.h"
#pragma warning(disable: 4800)

// Local helper functions
IPin * GetInPin( IBaseFilter * pFilter, int PinNum );
IPin * GetOutPin( IBaseFilter * pFilter, int PinNum );

//------------------------------------------------------------------------------
// File: CenFilter.h
//
// Desc: MODIFIED DirectShow sample code - Header file for the CenReader and 
//       CenWriter filters
//
//------------------------------------------------------------------------------

#pragma once

#include < streams.h >
#include "../../vss/ImageProcessing.h"



#ifdef _DEBUG
#include < stdio.h >
char static gDbgStr[200];
#endif

Is this what you need?

Joaquín M López Muñoz23-Jul-02 8:12

23-Jul-02 8:12

The code didn't seem to help much... I'm far from sure about what follows, but it's worth giving a try. Go to Project->Settings, C/C++ tab, Code Generation, enable C++ exceptions.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moredip23-Jul-02 8:14

23-Jul-02 8:14

Already tried that Frown | :(

moredip23-Jul-02 8:41

23-Jul-02 8:41

I just noticed something. In the project settings command line options there is the following:

/D try=__try /D except=__except /D leave=__leave /D finally=__finally...

which I'm guessing redefines try to __try, etc.

Looking in MSDN, it seems that __try is a MS-specific extension for C. It also says:
"Note Structured exception handling works with Win32 for both C and C++ source files. However, it is not specifically designed for C++. You can ensure that your code is more portable by using C++ exception handling. Also, C++ exception handling is more flexible, in that it can handle exceptions of any type. For C++ programs, it is recommended that you use the new C++ exception-handling mechanism (try, catch, and throw statements). "

Maybe I'll try removing those lines in the project settings and see what happens...

Joaquín M López Muñoz23-Jul-02 8:55

23-Jul-02 8:55

Ummm... think you've got something now. Please tell us the result. Good luck.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moredip23-Jul-02 9:24

23-Jul-02 9:24

Hurray!

Yep, that (eventually) fixed the problems.

Thanks for the help Joaquin,

Pete

Joaquín M López Muñoz23-Jul-02 9:33

23-Jul-02 9:33

Thanks for the help Joaquin

I didn't help much this time, it was all your job.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moredip23-Jul-02 9:34

23-Jul-02 9:34

well, thanks for the moral support then Wink | ;)

GetWindowText

RobJones23-Jul-02 6:41

RobJones

23-Jul-02 6:41

Hello,
I am trying to pull text from inside a edit box on another application.. Here is what I have tried, this only pulls the windows title bar text.. any ideas on how i can pull text from with in a edit box on another app?

    CWnd* cWnd;
POINT pt;
::GetCursorPos(&pt);
cWnd = WindowFromPoint(pt);
CString strBuf;
cWnd->GetWindowText(strBuf);
MessageBox(strBuf);

Thanks

Rob

Joaquín M López Muñoz23-Jul-02 7:33

23-Jul-02 7:33

I guess you can call ChildWindowFromPoint on the cWnd retrieved, sort of like this (warning: didn't compile it):

CWnd* cWnd;
POINT pt;
::GetCursorPos(&pt);
cWnd = WindowFromPoint(pt);
cWnd->ScreenToClient(&pt);
CWnd* cChildWnd = cWnd->ChildWindowFromPoint(pt);
CString strBuf;
cChildWnd->GetWindowText(strBuf);
MessageBox(strBuf);

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Williams23-Jul-02 7:57

Williams

23-Jul-02 7:57

I think the better way is to use SendMessage and OnCopyData.

1. First you search your target window handle.
2. You send a WM_COPYDATA to target window.
3. Write in your target app a function to handlw WM_COPYDATA

Code:

char szWindowName[60];
// "Target App" is the target app main window caption
CString szTargetWindowName = "Target App";

int nFound;
int nLength = strlen(szTargetWindowName);

HWND hSearchHandle;

for(hSearchHandle=::GetWindow(::GetDesktopWindow(), GW_CHILD);hSearchHandle; hSearchHandle = ::GetWindow(hSearchHandle, GW_HWNDNEXT))
{
::GetWindowText(hSearchHandle, szWindowName, 58);
szWindowName[nLength] = '\0';
nFound = lstrcmpi(szWindowName, szTargetWindowName);

if(nFound == 0)
{
CWnd pCwnd;
COPYDATASTRUCT cds;
char myStr[60];

strcpy(myStr,"Lets go.");

cds.dwData = 0;
cds.lpData = myStr;
cds.cbData = sizeof(myStr);

LONG lResult;
lResult = ::SendMessage(hSearchHandle, WM_COPYDATA,(WPARAM)&pCwnd.m_hWnd, (LPARAM)(COPYDATASTRUCT*)&cds);
}
}
-----------------------------------------
Now in your target app:

BOOL CAppADlg::OnCopyData(CWnd* pWnd, COPYDATASTRUCT* pCopyDataStruct)
{

MessageBox((char *)pCopyDataStruct->lpData);

return CDialog::OnCopyData(pWnd, pCopyDataStruct);
}

Try it.

RobJones23-Jul-02 8:06

RobJones

23-Jul-02 8:06

The target app is not mine (It's commercial software and I don't have the source code).. Frown | :(

Basicly what I am trying to do is pull text from the Rich edit control on Yahoo! Messenger (The chat window. When you are talking to someone) and store the whole msg in a string.

Peter Occil23-Jul-02 10:07

Peter Occil

23-Jul-02 10:07

GetWindowText will not retrieve the text in an edit control in another application (thread?). GetWindowText retrieves the caption from the window's internal data. Even with a lot of text, edit controls always have an empty string as its caption.

The workaround is to send the edit control a WM_GETTEXT message (preferably using SendMessageTimeout) to retrieve the text.

Peter O.