Problem converting a CComBSTR to LPCTSTR with CW2CT - C / C++ / MFC Discussion Boards

Re: FlexGrid Sort

29-May-02 15:38

Yeah, the assignment calls for FlexGrid.

Create form controls at runtime

Aaron Schaefer29-May-02 12:55

Aaron Schaefer

29-May-02 12:55

Hi All,

A Quick question. I am trying to create controls on a form at run time, in a CFormView derived class. I have got the following code, which is trying to create a static label on the form, that should display the word "Test". I got the styles and extended styles for the window from looking at another static labels properties in Spy++. This is in my CFormView derived class's OnInitialUpdate:

HWND hWndTest = CreateWindowEx(
WS_EX_LEFT | WS_EX_LTRREADING | WS_EX_RIGHTSCROLLBAR | WS_EX_NOPARENTNOTIFY, // extended window style
"Static", // registered class name
"Test", // window name
WS_VISIBLE | WS_CHILDWINDOW | WS_GROUP | SS_LEFT, // window style
30, // horizontal position of window
30, // vertical position of window
40, // window width
20, // window height
m_hWnd, // handle to parent or owner window
NULL, // menu handle or child identifier
NULL, // handle to application instance
NULL // window-creation data
);

The thing is, I get a static label on the form, that is in fact displaying the word "Test", but it looks different than the static labels that I put on the dialog template. The font is bold, or something.

Anybody ever done this before? Why would this produce a different lookin label than doing it the normal way?

Thanks,

Aaron

Re: Create form controls at runtime

Matt Gullett29-May-02 12:52

Matt Gullett

29-May-02 12:52

You need to set the font for the created control. When you design a form using the resource editor it sets a default font for you (you can change it). This is not the standard system font which is the default for controls to draw with. You need to GetFont() from your dialog and SetFont(GetFont()) for your created control.

Re: Create form controls at runtime

Aaron Schaefer29-May-02 13:09

Aaron Schaefer

29-May-02 13:09

Thanks! That worked like a charm.

Smile | :)

fstream issues

Alan Chambers29-May-02 10:45

Alan Chambers

29-May-02 10:45

Hi all, I just want wanted to know what the best way of loading a binary file was without using MFC (I can do it using CFile and CArchive). At the moment I want to load in a file format that composes of 7 integers into 7 different variables. I'm also a bit worried about the robustness of the procedure. At the moment I have:

#include fstream

ifstream fin(FilePath, ios::binary)
if (fin)
{
fin.read(var1, sizeof(int));
fin.read(var2, sizeof(int));
etc.
}
fin.close();

but this seems remarkably inefficient as opposed to using the (arrow, arrow)operator as with MFC. Is this the best way to do this kind of thing? I know there is a function fin.eof() which tests for the end of the file, but surely I can't add that before each variable extraction? Its more used for text files and character extraction isn't it? I just need the best way of going about loading the data in this format into the seven different variables WITHOUT MFC. Thanks to all who are thinking about a solution.

Alan.

"When I left you I was but the learner, now I am the master" - Darth Vader

Re: fstream issues

Joaquín M López Muñoz29-May-02 11:12

Joaquín M López Muñoz

29-May-02 11:12

If the numbers are stored in binary format, then your code is just fine, and probably is as efficient as any MFC method. iostreams also have operators << and >>, but these are meant to handle numbers expressed in text mode. The code can be refined a little with the use of exceptions:

ifstream fin;
fin.exceptions(ifstream::eofbit|ifstream::failbit|ifstream::badbit);
try{
  fin.open(FilePath, ios::binary);
  fin.read(var1, sizeof(int));
  fin.read(var2, sizeof(int));
  ...
}
catch(ifstream::failure& e){
  // something bad happened
}
fin.close();

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: fstream issues

Alan Chambers29-May-02 11:21

Alan Chambers

29-May-02 11:21

Thanks for the reply Joaquin, I was wondering how to use the try catch exceptions without MFC (I have used CException but obviously can't if I'm not using MFC) and you have given it to me on a plate, so many thanks for that Smile | :)

. I also thank you for reaffirming the loading method, you know sometimes when you get that feeling when something doesn't quite feel right (thats what I got)? I think your example looks a lot sweeter, mind, with the try catch stuff in it, its exactly what I was looking for. Again, many thanks Joaquin, may the code be with you.

Alan.

"When I left you I was but the learner, now I am the master" - Darth Vader

Problem converting a CComBSTR to LPCTSTR with CW2CT

JC Gauthier29-May-02 10:24

JC Gauthier

29-May-02 10:24

I have a problem converting a CComBSTR to LPCTSTR with CW2CT. Eveything works fine until my CComBSTR gets around 64 caracters... then the result of the convertion is a long "corrupted" string: "îþîþîþîþîþîþîþîþîþîþîþîþîþîþîþ...."

Please help me ! Cry | :((

-----
See comments between /* */ for more info
-----

LRESULT CListBoxDlg::OnBnClickedBtngetselitems(WORD /*wNotifyCode*/, WORD /*wID*/, HWND /*hWndCtl*/, BOOL& /*bHandled*/)
{
	LPCTSTR sTitle;			// Message box title
	int arrSelList[12];		// Message buffer
	TCHAR pszBuf[128] = "";// Message buffer
	int iMaxNum = 12;		// Max number of selected items
	LRESULT iSelCount = 0;	// Total selected items in the list
	LPCTSTR sMsg = 0;		// Message to put in the message box
	CComBSTR bsMessage;		// Message accumulator

	iSelCount = this->SendDlgItemMessage(IDC_AVSCODES, LB_GETSELITEMS, WPARAM(iMaxNum), LPARAM(arrSelList));

	if (iSelCount != LB_ERR) {

		bsMessage.Append("You have selected the fields: ");
		_stprintf(pszBuf, "%li", arrSelList[0]);
		bsMessage.Append(pszBuf);

		for (int i = 1; i < iSelCount; i++) {

			bsMessage.Append(", ");
			_stprintf(pszBuf, "%li", arrSelList[i]);
			bsMessage.Append(pszBuf);
		}
		bsMessage.Append(".");
		/* The following line will fails if bsMessage.m_str contains:
			"You have selected the fields: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11."
		   But will not fail if it bsMessage.m_str contains:
			"You have selected the fields: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10."
			(4 caracter less) but long size is not suppose the cause problems
			with ATL 7.0 compared to ATL 3.0
		*/
		sMsg = CW2CT(bsMessage.m_str);
		/*
		// The following two lines makes it work fine but USES_CONVERSION is not supposed
		// to be needed with ATL 7.0
		USES_CONVERSION;
		sMsg = W2CT(bsMessage.m_str);*/
		sTitle = _T("Selected Items List");
		::MessageBox(this->m_hWnd, sMsg, sTitle, MB_OK);
	}

	return 0;
}

ompared to ATL 3.0
*/
sMsg = CW2CT(bsMessage.m_str);
/*
// The following two lines makes it work fine but USES_CONVERSION is not supposed
// to be needed with ATL 7.0
USES_CONVERSION;
sMsg = W2CT(bsMessage.m_str);*/
sTitle = _T("Selected Items List");
::MessageBox(this->m_hWnd, sMsg, sTitle, MB_OK);
}

return 0;
}

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
J.-C. Gauthier - http://www.grandmenhir.com/

Re: Problem converting a CComBSTR to LPCTSTR with CW2CT

soptest29-May-02 12:25

soptest

29-May-02 12:25

This is the problem:

TCHAR pszBuf[128] = "";// Message buffer

buffer size is for 64 wide char's

soptest

Re: Problem converting a CComBSTR to LPCTSTR with CW2CT

JC Gauthier30-May-02 4:27

JC Gauthier

30-May-02 4:27

even with 1024 it doesn't work

TCHAR pszBuf[1024] = "";// Message buffer

maybe there is something else I need to do.

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
J.-C. Gauthier - http://www.grandmenhir.com/

Re: Problem converting a CComBSTR to LPCTSTR with CW2CT

soptest30-May-02 8:36

soptest

30-May-02 8:36

Use thi9s code:

//------------------------//
// Convert BSTR to char * //
//------------------------//
inline char* ConvertBSTRToString(BSTR pSrc)
{
	if(!pSrc) return NULL;
	
	DWORD cb,cwch = ::SysStringLen(pSrc);//convert even embeded NULL
	
	char *szOut = NULL;
	
	if(cb = ::WideCharToMultiByte(CP_ACP, 0, pSrc, cwch + 1, NULL, 0, 0, 0))
	{
		szOut = new char[cb];
		if(szOut)
		{
			szOut[cb - 1]  = '\0';
			
			if(!::WideCharToMultiByte(CP_ACP, 0, pSrc, cwch + 1, szOut, cb, 0, 0))
			{
				delete []szOut;//clean up if failed;
				szOut = NULL;
			}
		}
	}

	return szOut;
};

soptest

_popen issue

Stew29-May-02 9:41

Stew

29-May-02 9:41

I'm trying to open a pipe to traverse through a list of files retrieved using a "dir" command. I have everything set up the way I used to have it in one of my other applications; but, for some reason, it's not working.

Here's the code:

if( (fp = _popen( szCommand, "r" )) == NULL )
exit( 1 );

Where fp is defined as FILE* and szCommand is a a CString containing the Short Path to the directory I'm trying to look at. The function returns NULL and shuts the app down. I'm not sure what I'm doing wrong or if it's something caused by Windows 2000 or what. Does anyone have any ideas?

Re: _popen issue

Joaquín M López Muñoz29-May-02 9:46

Joaquín M López Muñoz

29-May-02 9:46

Is yours a Windows app? Seems like _popen works only for console apps.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: _popen issue

soptest29-May-02 9:56

soptest

29-May-02 9:56

you must pass "dir" command to szCommand not a path

* POPEN.C: This program uses _popen and _pclose to receive a 
 * stream of text from a system process.
 */

#include <stdio.h>
#include <stdlib.h>

void main( void )
{

   char   psBuffer[128];
   FILE   *chkdsk;

        /* Run DIR so that it writes its output to a pipe. Open this
    * pipe with read text attribute so that we can read it 
         * like a text file. 
    */
   if( (chkdsk = _popen( "dir *.c /on /p", "rt" )) == NULL )
      exit( 1 );

   /* Read pipe until end of file. End of file indicates that 
    * CHKDSK closed its standard out (probably meaning it 
         * terminated).
    */
   while( !feof( chkdsk ) )
   {
      if( fgets( psBuffer, 128, chkdsk ) != NULL )
         printf( psBuffer );
   }

   /* Close pipe and print return value of CHKDSK. */
   printf( "\nProcess returned %d\n", _pclose( chkdsk ) );
}

soptest

Weird Keyboard Hooking Issue

John Aldrich29-May-02 9:02

John Aldrich

29-May-02 9:02

I've got a really strange keyboard hooking issue that is causing problems between the debug and release versions of the test code, namely the debug version is working globally while the release version seems to only work within the context of the test app window. Below is the source code for the test app. Any insight into this would be greatly apprecaited.

----------------------------------------------

#include "stdafx.h"

static HHOOK KeyboardHookHandle = NULL;

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);

LRESULT CALLBACK KeyboardHookProc(int code, WPARAM wParam, LPARAM lParam)
{
MessageBox(NULL, "Keystroke Detected", "Memorex", MB_OK);
return CallNextHookEx(KeyboardHookHandle, code, wParam, lParam);
}

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
HWND hwnd;
MSG msg;
WNDCLASSEX wndclass;

wndclass.cbSize = sizeof (wndclass);
wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 0;
wndclass.cbWndExtra = 0;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (NULL, IDI_WINLOGO);
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);

wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = "KeyboardHookTest";
wndclass.hIconSm = LoadIcon (NULL, IDI_WINLOGO);

RegisterClassEx (&wndclass);

hwnd = CreateWindow ("KeyboardHookTest",
"KeyboardHookingTest",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hInstance,
NULL);

ShowWindow (hwnd, iCmdShow);
UpdateWindow (hwnd);

while (GetMessage (&msg, NULL, 0, 0))
{
TranslateMessage (&msg);
DispatchMessage (&msg);
}

return msg.wParam ;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
switch (iMsg)
{
case WM_CREATE:

KeyboardHookHandle = SetWindowsHookEx(WH_KEYBOARD, KeyboardHookProc, 0, 0);

break;

case WM_SIZE:

break;

case WM_PAINT:

break;

case WM_DESTROY:

if (KeyboardHookHandle)
UnhookWindowsHookEx(KeyboardHookHandle);
PostQuitMessage(0);

break;
}

return DefWindowProc (hwnd, iMsg, wParam, lParam);

}

----------------------------------------------
I can't seem to isolate what is causing such anomalous behavior and I also apologize for the 'messiness' of my code. Again, any help would be apprecaited.

Can you imagine Darth Maul on speed?

Re: Weird Keyboard Hooking Issue

Joaquín M López Muñoz29-May-02 9:34

Joaquín M López Muñoz

29-May-02 9:34

First of all, I'd say your code is clear as water Smile | :)

The docs are rather obscure in this point, but it could be that you have to pass hInstance as the hMod parameter of SetWindowsHookEx --giving it a try is cheap, anyway.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

I think I got it now

Joaquín M López Muñoz29-May-02 9:40

Joaquín M López Muñoz

29-May-02 9:40

Paying closer attention to the docs, there's a line that says:

All global hook functions must be in libraries

So, you've got to move your code to a DLL. As for why it seemed to work on Debug mode, I guess it is because the executable is run in the context of the debugger process, acting like a sort of DLL on the eye of the system (To check this out, symply execute your debug .EXE by double clicking it outside the IDE. If my theory proves right, you'll get the same behavior as in release mode --no global hooking.)

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

MeasureItem doesn't get called.

29-May-02 9:07

In my owner draw combobox, MeasureItem doesn't get called (at least when I use AddString ). However DrawItem does get called. But without MeasureItem, the heights are screwed up.

What's wrong?

Re: MeasureItem doesn't get called.

Paul M Watt29-May-02 9:22

Paul M Watt

29-May-02 9:22

Are you using a fixed size combo box?

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

Re: MeasureItem doesn't get called.

29-May-02 9:46

I'm not.

cs.dwExStyle |= WS_EX_CLIENTEDGE;
cs.style &= ~( CBS_OWNERDRAWFIXED | CBS_SORT );
cs.style |= ( CBS_OWNERDRAWVARIABLE | CBS_DROPDOWNLIST | CBS_HASSTRINGS );

Even if I am, MeasureItem should still be able to determine the height of each entry, just not separately.

Question

Steve L.29-May-02 9:04

Steve L.

29-May-02 9:04

How do you make it so any file with a certain extension is opened with your program?

-Raffi

Re: Question

Mauricio Ritter29-May-02 9:20

Mauricio Ritter

29-May-02 9:20

I answered this question in other thread... here is

THE LINK

Mauricio Ritter - Brazil
Sonorking now: 100.13560 Trank

Beer | [beer]

The alcohol is one of the greatest enemys of man, but a man who flee from his enemys is a coward. Beer | [beer]

Maximum value of unsigned long

Hoang Le29-May-02 8:54

Hoang Le

29-May-02 8:54

Does anyone know the maximum value of an unsigned long and a signed long variable in Windows NT ?

Thanks,
Hoang

Hoang Le

Re: Maximum value of unsigned long

Joaquín M López Muñoz29-May-02 8:50

Joaquín M López Muñoz

29-May-02 8:50

4,294,967,295 (2³²-1) and 2,147,483,647 (2³¹-1) respectively.

These are declared for your convenience as the macros ULONG_MAX and LONG_MAX in <limits.h>, so you'd better use those rather than the crude numbers.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Maximum value of unsigned long

Christopher Lord29-May-02 12:49

Christopher Lord

29-May-02 12:49

And 64-bit versions of NT will of course be 2^64-1 (18,446,744,073,709,551,615). That is why the macros are useful.

// Rock

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