Convert HWND to LPCTSTR WIN32

micheal jordan · #1 05-20-2008, 10:18 PM

hi every one
I'm new here and new to windows programing
how to convert from HWND to LPCTSTR
I want to disply a message after I use FindWindow
the handle mast be HWND and the caption must be LPCTSTR
so any one know how to do this

HWND Handle;
Handle=FindWindow("win32padClass","[Untitled]* - win32pad");
MessageBox(hWnd,Handle,"Handle",MB_OK);

thank you;
.

xpi0t0s · #2 07-18-2008, 05:47 AM

Impossible to answer from the information given, except to say that converting a HWND to a LPCTSTR is impossible; they're completely different objects.

Could you give an example, you mentioned "[Untitled]* - win32pad", what message exactly do you want to display if, say, the window handle of the first window you find with this title is 0x01234567?

micheal jordan · #3 07-18-2008, 11:20 PM

hi there
I'm sorry if the question is not clear
let's say what you say
I find a Window Handle with FindWindow/EX
we know that the type of that return is HWND

now, how about that
I have a Window with child windows

static= Caption
static=class
static = Handle
and a

edit=NULL // for the window CAPTION
edit=NULL // for the window CLASS
edit=NULL //for the window HANDLE // that is disabled
and
button=Find Window

now the user write the caption and the class of the window
he wants to get its handle

and when he clicks the button, the found handle should be written in the edit
window's handle

xpi0t0s · #4 07-20-2008, 05:24 AM

OK, you can convert a number into a string with sprintf. I'd probably use the format string 0x%08lx, then the resulting string would contain "0x01234567" in my example.

micheal jordan · #5 07-20-2008, 11:14 PM

Hi there
would you xpi0t0s
give an example or just change the attached sample PLEASE

shabbir · #6 07-20-2008, 11:17 PM

Hey, for security reasons we don't allow attachments for code and I would suggest you share the code in posts.

micheal jordan · #7 07-22-2008, 08:53 PM

all right what ever
here is the C++ code

Code:

// Test.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include <commctrl.h>
#include "resource.h"
#include <stdio.h>
#include <string>
using namespace std;
int CALLBACK DlgProc(HWND hDlg, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    switch (uMsg) {
	case WM_DESTROY:
		case WM_CLOSE:
			PostQuitMessage(0);
		break;
    case WM_INITDIALOG:

        RECT    rc;

        GetWindowRect(hDlg, &rc);

        int     nWidth, nHeight;
        
        nWidth = rc.right - rc.left;
        nHeight = rc.bottom - rc.top;
        
        int     cxScreen, cyScreen;
        
        cxScreen = GetSystemMetrics(SM_CXSCREEN);
        cyScreen = GetSystemMetrics(SM_CYSCREEN);

        MoveWindow(hDlg, (cxScreen - nWidth) / 2, (cyScreen - nHeight) / 2, nWidth, nHeight, TRUE);

        break;

    case WM_COMMAND:

        switch (LOWORD(wParam)) {

		case ID_GETHWND:
HWND hwnd,hEdit1,hEdit2;
HWND hEdit3;


hEdit1=GetDlgItem(hDlg,ID_CAPTION);
hEdit2=GetDlgItem(hDlg,ID_CLASS);
hEdit3=GetDlgItem(hDlg,ID_HWND);

int lEdit1,lEdit2;
lEdit1=SendMessage(hEdit1,WM_GETTEXTLENGTH,NULL,NULL);
lEdit2=SendMessage(hEdit2,WM_GETTEXTLENGTH,NULL,NULL);

char Caption[255];
char Class[255];

GetWindowText(hEdit1,Caption,GetWindowTextLength(hEdit1) + 1);
GetWindowText(hEdit2,Class,GetWindowTextLength(hEdit2) + 1);

hwnd=FindWindow(Class,Caption); //we find the window

/*what is wrong here NOTING WORK

SendMessage(hEdit3,WM_SETTEXT,(WPARAM)hwnd,NULL);
SendMessage(hEdit3,WM_SETTEXT,hwnd,NULL);
SetWindowText(hEdit3,(LPCTSTR)hwnd);
SetWindowText(hEdit3,h);
*/
        }

        break;

    }
    return 0;
}

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
    InitCommonControls();
	DialogBoxParam(hInstance, MAKEINTRESOURCE(IDD_DIALOG), 0, DlgProc, 0);

	return 0;
}

here is the RC code

Code:

//Microsoft Developer Studio generated resource script.
//
#include "resource.h"

#define APSTUDIO_READONLY_SYMBOLS
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 2 resource.
//
#include "afxres.h"

/////////////////////////////////////////////////////////////////////////////
#undef APSTUDIO_READONLY_SYMBOLS

/////////////////////////////////////////////////////////////////////////////
// Chinese (P.R.C.) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_CHS)
#ifdef _WIN32
LANGUAGE LANG_CHINESE, SUBLANG_CHINESE_SIMPLIFIED
#pragma code_page(936)
#endif //_WIN32

#ifdef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// TEXTINCLUDE
//

1 TEXTINCLUDE DISCARDABLE 
BEGIN
    "resource.h\0"
END

2 TEXTINCLUDE DISCARDABLE 
BEGIN
    "#include ""afxres.h""\r\n"
    "\0"
END

3 TEXTINCLUDE DISCARDABLE 
BEGIN
    "\r\n"
    "\0"
END

#endif    // APSTUDIO_INVOKED

#endif    // Chinese (P.R.C.) resources
/////////////////////////////////////////////////////////////////////////////


/////////////////////////////////////////////////////////////////////////////
// English (U.S.) resources

#if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
#ifdef _WIN32
LANGUAGE LANG_ENGLISH, SUBLANG_ENGLISH_US
#pragma code_page(1252)
#endif //_WIN32

/////////////////////////////////////////////////////////////////////////////
//
// Dialog
//

IDD_DIALOG DIALOG DISCARDABLE  0, 0, 252, 42
STYLE DS_MODALFRAME | WS_POPUP | WS_CAPTION | WS_SYSMENU
CAPTION "Find Window Handle"
FONT 8, "MS Sans Serif"
BEGIN
    LTEXT           "Caption",IDC_STATIC,4,7,25,8
    LTEXT           "Class",IDC_STATIC,3,26,21,8
    EDITTEXT        ID_CAPTION,31,7,110,12,ES_AUTOHSCROLL
    EDITTEXT        ID_CLASS,31,25,110,12,ES_AUTOHSCROLL
    PUSHBUTTON      "Get Handle",ID_GETHWND,147,17,50,14
    EDITTEXT        ID_HWND,200,17,51,14,ES_AUTOHSCROLL
END


/////////////////////////////////////////////////////////////////////////////
//
// Icon
//

// Icon with lowest ID value placed first to ensure application icon
// remains consistent on all systems.


/////////////////////////////////////////////////////////////////////////////
//
// DESIGNINFO
//

#ifdef APSTUDIO_INVOKED
GUIDELINES DESIGNINFO DISCARDABLE 
BEGIN
    IDD_DIALOG, DIALOG
    BEGIN
        RIGHTMARGIN, 251
        BOTTOMMARGIN, 37
    END
END
#endif    // APSTUDIO_INVOKED


/////////////////////////////////////////////////////////////////////////////
//
// 24
//

1                       24      DISCARDABLE     "xptheme.bin"
#endif    // English (U.S.) resources
/////////////////////////////////////////////////////////////////////////////



#ifndef APSTUDIO_INVOKED
/////////////////////////////////////////////////////////////////////////////
//
// Generated from the TEXTINCLUDE 3 resource.
//


/////////////////////////////////////////////////////////////////////////////
#endif    // not APSTUDIO_INVOKED

I HOPE THAT IS A LITTLE CLEAR

xpi0t0s · #8 07-23-2008, 12:48 AM

Code:

SendMessage(hEdit3,WM_SETTEXT,(WPARAM)hwnd,NULL);
SendMessage(hEdit3,WM_SETTEXT,hwnd,NULL);
SetWindowText(hEdit3,(LPCTSTR)hwnd);
SetWindowText(hEdit3,h);

It's been a while since I've done any WinAPI dialog programming so I'm not sure whether you should use SendMessage...WM_SETTEXT or SetWindowText, in fact they could be equivalent.

However it doesn't work because hwnd is a window handle, not a text string. Any functions that relate to text MUST take a char*.

So if you want to display the window handle itself you must convert the handle to text, which you can do with sprintf, which works exactly the same way as printf except that there is an additional parameter at the start that tells sprintf where to print the text. For example

Code:

char str[128];
sprintf(str,"Window handle is 0x%08x",hwnd);

micheal jordan · #9 07-24-2008, 10:31 PM

thank you
I use these tree lines

Code:

	char szBuffer[256];
	sprintf(szBuffer, "0x%08x", hwnd);
	SetWindowText(hEdit3,szBuffer);

johny10151981 · #10 10-05-2008, 04:12 AM

char szBuffer[256];
sprintf(szBuffer, "0x%08x", hwnd);
SetWindowText(hEdit3,szBuffer);

i dont think it will work properly, you may get japanese kanji as out put try with TCHAR szBufferp[256]; (wide charecter version),
next thing is find/create a function to convert from large number to TCHAR