C++ CreateWindow / SendMessage - Please help

[k4ghg]

Hi - I am so new to C++ that I am not sure of what to ask. I found some code (See below) that creates values boxes/buttons that work. But I am having problems populating the items. I think I can use sendmessage, but when I do it does not work. Any help would be appreciated. Thank You...

#include <stdio.h>
#include <string.h>
#include <windows.h>
#include <winuser.h>
#include <commctrl.h>

#define BTN_BUTTON 201
#define CMB_COMBOBOX 202
#define LST_LISTBOX 203
#define TXT_TEXTBOX 204

#define WC_COMBOBOX
#define IDC_EDITBOX

/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

/* Make the class name into a global variable */
char szClassName[ ] = "CodeBlocksWindowsApp";


int WINAPI WinMain (HINSTANCE hThisInstance, HINSTANCE hPrevInstance,
LPSTR lpszArgument, int nCmdShow){
HWND hwnd; /* This is the handle for our window */
MSG messages; /* Here messages to the application are saved */
WNDCLASSEX wincl; /* Data structure for the windowclass */

/* The Window structure */
wincl.hInstance = hThisInstance;
wincl.lpszClassName = szClassName;
wincl.lpfnWndProc = WindowProcedure; /* This function is called by windows */
wincl.style = CS_DBLCLKS; /* Catch double-clicks */
wincl.cbSize = sizeof (WNDCLASSEX);

/* Use default icon and mouse-pointer */
wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
wincl.lpszMenuName = NULL; /* No menu */
wincl.cbClsExtra = 0; /* No extra bytes after the window class */
wincl.cbWndExtra = 0; /* structure or the window instance */

/* Use Windows's default colour as the background of the window */
wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

/* Register the window class, and if it fails quit the program */
if (!RegisterClassEx (&wincl))
return 0;

/* The class is registered, let's create the program*/
hwnd = CreateWindowEx (0, /* Extended possibilites for variation */
szClassName, /* Classname */
"Test Window", /* Title Text */
WS_OVERLAPPEDWINDOW, /* default window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
544, /* The programs width */
375, /* and height in pixels */
HWND_DESKTOP, /* The window is a child-window to desktop */
NULL, /* No menu */
hThisInstance, /* Program Instance handler */
NULL /* No Window Creation data */
);

/* Make the window visible on the screen */
ShowWindow (hwnd, nCmdShow);

/* Run the message loop. It will run until GetMessage() returns 0 */
while (GetMessage (&messages, NULL, 0, 0)){
/* Translate virtual-key messages into character messages */
TranslateMessage(&messages);
/* Send message to WindowProcedure */
DispatchMessage(&messages);
}

/* The program return-value is 0 - The value that PostQuitMessage() gave */
return messages.wParam;
}




LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){

switch (message) /* handle the messages */
{

case WM_CREATE:

CreateWindow ("combobox",NULL,
WS_CHILD | WS_VISIBLE | CBS_DROPDOWNLIST,
20, 10, 400, 120,
hwnd, (HMENU)CMB_COMBOBOX, GetModuleHandle(NULL), NULL);

CreateWindow ("listbox", NULL,
WS_CHILD | WS_VISIBLE | LBS_NOTIFY,
20, 40, 140, 120,
hwnd, (HMENU)LST_LISTBOX, GetModuleHandle(NULL), NULL);

CreateWindow("edit", NULL,
WS_VISIBLE | WS_CHILD | WS_BORDER | WS_VSCROLL| ES_MULTILINE | ES_AUTOHSCROLL,
170, 40, 250, 120,
hwnd, (HMENU)TXT_TEXTBOX, GetModuleHandle(NULL), NULL);

CreateWindow("button", "Submit This",
WS_CHILD | WS_VISIBLE | BS_DEFPUSHBUTTON,
300, 170, 120, 30,
hwnd, (HMENU)BTN_BUTTON, GetModuleHandle(NULL), NULL);

CreateWindow(TEXT("button"), TEXT("You should press this button"),
WS_VISIBLE | WS_CHILD,
250, 220, 255, 30,
hwnd, (HMENU)TXT_TEXTBOX, NULL, NULL);

CreateWindow(TEXT ("EDIT"), TEXT ("Value"),
WS_VISIBLE | WS_CHILD | WS_BORDER,
250, 260, 120,20,
hwnd, (HMENU)NULL, NULL, NULL);

break;

case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;

default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;

}