Thread: Children window - GetWindowText

Hello I am trying to recieve text from my EDIT window but the code return a strange error.
Could you look threw the code please?

Code:

#include <windows.h>
#include "resource.h"

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

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   PSTR szCmdLine, int iCmdShow)
{
    TCHAR szAppName[] = TEXT("Default window");           // Header
    HWND hWnd;
	HWND hWnd_read;
	HWND hWnd_edit;
    MSG msg;
    WNDCLASSEX wc;
    
    wc.cbSize = sizeof(wc);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));            // Ico
    wc.hIconSm = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));         // Ico_sm
    wc.hCursor = LoadCursor(hInstance, MAKEINTRESOURCE(IDC_CURSOR));
    wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);           // Background
    wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU);
    wc.lpszClassName = szAppName;
    
    RegisterClassEx(&wc);
    
    hWnd = CreateWindowEx(0,szAppName,
                        szAppName,
                        WS_OVERLAPPEDWINDOW,
                        200,                    // Margin from left
                        200,                    // Margin from top
                        500,                    // Widht
                        400,                    // Height
                        NULL,
                        NULL,
                        hInstance,NULL);
    ShowWindow(hWnd, iCmdShow);
    UpdateWindow(hWnd);
    
//Child wins
	hWnd_read = CreateWindowEx(0,
		TEXT("BUTTON"),
		TEXT("Read"),
		WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
		20, 40, 75, 25,
		hWnd, 
		NULL,
		hInstance,
		NULL);
	if ( hWnd_read == NULL )
		return FALSE;

	hWnd_edit = CreateWindowEx(WS_EX_CLIENTEDGE,
		TEXT("EDIT"),
		TEXT("Edit"),
		WS_CHILD | WS_VISIBLE | ES_LEFT,
		20, 10, 200, 25,
		hWnd,
		NULL,
		hInstance,
		NULL);
	if ( hWnd_edit == NULL )
		return FALSE;

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

void Write(HWND hWnd)
{
	PAINTSTRUCT	ps;
	HDC			hDC;
	RECT		rect;
	hDC = BeginPaint(hWnd, &ps);
	GetClientRect(hWnd, &rect);
	SetBkMode(hDC, TRANSPARENT);
	DrawText(hDC, TEXT("Hi there"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
	ReleaseDC(hWnd, hDC);
	EndPaint(hWnd, &ps);
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	TCHAR chText[100];
        switch(message)
        {
          case WM_DESTROY:
          PostQuitMessage(0);
          return 0;

		  case WM_PAINT:
			  Write(hWnd);
				break;

		  case WM_COMMAND:
			  switch(LOWORD(wParam))
			  {
			  case ID_EXIT:
				  SendMessage(hWnd, WM_DESTROY, wParam, lParam);
			  case ID_FUNCTION1:
				  GetWindowText(hWnd_edit, chText, 100);
				  MessageBox(hWnd, chText, TEXT("Your text"), MB_ICONINFORMATION);
				  break;
			  }
        }
        return DefWindowProc(hWnd, message, wParam, lParam);
}

Error content: "error C2065: 'hWnd_edit' : undeclared identifier"

MS Visual C++

Yes, in fact, you should declare ALL of those as globals.

Code:

#include <windows.h>
#include "resource.h"

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

TCHAR chText[100];
TCHAR szAppName[ ] = TEXT("Default window"); // Header
HWND hWnd;
HWND hWnd_read;
HWND hWnd_edit;
MSG msg;
WNDCLASSEX wc;
PAINTSTRUCT ps;
HDC hDC;
RECT rect;

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                   PSTR szCmdLine, int iCmdShow)
{
    wc.cbSize = sizeof(wc);
    wc.style = CS_HREDRAW | CS_VREDRAW;
    wc.lpfnWndProc = WndProc;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));            // Ico
    wc.hIconSm = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_ICON));         // Ico_sm
    wc.hCursor = LoadCursor(hInstance, MAKEINTRESOURCE(IDC_CURSOR));
    wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);           // Background
    wc.lpszMenuName = MAKEINTRESOURCE(IDR_MENU);
    wc.lpszClassName = szAppName;
    
    RegisterClassEx(&wc);
    
    hWnd = CreateWindowEx(0,szAppName,
                        szAppName,
                        WS_OVERLAPPEDWINDOW,
                        200,                    // Margin from left
                        200,                    // Margin from top
                        500,                    // Widht
                        400,                    // Height
                        NULL,
                        NULL,
                        hInstance,NULL);
    ShowWindow(hWnd, iCmdShow);
    UpdateWindow(hWnd);
    
//Child wins
	hWnd_read = CreateWindowEx(0,
		TEXT("BUTTON"),
		TEXT("Read"),
		WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
		20, 40, 75, 25,
		hWnd, 
		NULL,
		hInstance,
		NULL);
	if ( hWnd_read == NULL )
		return FALSE;

	hWnd_edit = CreateWindowEx(WS_EX_CLIENTEDGE,
		TEXT("EDIT"),
		TEXT("Edit"),
		WS_CHILD | WS_VISIBLE | ES_LEFT,
		20, 10, 200, 25,
		hWnd,
		NULL,
		hInstance,
		NULL);
	if ( hWnd_edit == NULL )
		return FALSE;

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

void Write(HWND hWnd)
{
	hDC = BeginPaint(hWnd, &ps);
	GetClientRect(hWnd, &rect);
	SetBkMode(hDC, TRANSPARENT);
	DrawText(hDC, TEXT("Hi there"), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);
	ReleaseDC(hWnd, hDC);
	EndPaint(hWnd, &ps);
}

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
        switch(message)
        {
          case WM_DESTROY:
          PostQuitMessage(0);
          return 0;

		  case WM_PAINT:
			  Write(hWnd);
				break;

		  case WM_COMMAND:
			  switch(LOWORD(wParam))
			  {
			  case ID_EXIT:
				  SendMessage(hWnd, WM_DESTROY, wParam, lParam);
			  case ID_FUNCTION1:
				  GetWindowText(hWnd_edit, chText, 100);
				  MessageBox(hWnd, chText, TEXT("Your text"), MB_ICONINFORMATION);
				  break;
			  }
        }
        return DefWindowProc(hWnd, message, wParam, lParam);
}