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Need help making an image the background for the window created by my c++ program

aseagle (11)
I am very new to C++. This is my code thus far, it's messy because I have tried so many things I have found online to try and make an image, which is titled global8000.bmp , the background for the window this code creates. Nothing has worked. I am using Dev C++ 5.11. Can someone please outline step by step what to do to accomplish this (basically hold my hand lol, tell me where certain things should go in the code) and ensure that there are no compile errors?:

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  #include <windows.h>
#include<conio.h>
#include <gdiplus.h>
#include <iostream>


#define ID_BTN 1
#define ID_TEXTBOX 2




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


#define IDBUTTON 102



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


int WINAPI WinMain (HINSTANCE hThisInstance,
                    HINSTANCE hPrevInstance,
                    LPSTR lpszArgument,
                    int nFunsterStil) {
    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 */
    g_hInst = hThisInstance;
    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 color as the background of the window */
    


// wincl.hbrBackground = CreatePatternBrush(HBITMAP)(LoadImage(0,("global8000.bmp"),IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION|LR_LOADFROMFILE));
   wincl.hbrBackground = ((HBRUSH) (LoadImage(0,("global8000.bmp"),IMAGE_BITMAP,0,0,LR_CREATEDIBSECTION|LR_LOADFROMFILE)));
    
    
    


    /* 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 */
           "Quality",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           1400,                 /* The programs width */
           800,                  /* 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, SW_SHOW);
    UpdateWindow(hwnd);


    /* 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;
}


static HWND hwndTextbox;


/*  This function is called by the Windows function DispatchMessage()  */


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


{
    
    
    
    
    
    switch (message)                  /* handle the messages */
    {
        case WM_CREATE:
             {
                 
                 
                 
                  hwndTextbox = CreateWindow(TEXT("EDIT"), TEXT("End Date"),
                               WS_VISIBLE|WS_CHILD,
                               930,360,200,20,
                               hwnd, (HMENU) ID_TEXTBOX, NULL, NULL);
                 hwndTextbox = CreateWindow(TEXT("EDIT"), TEXT(""),
                               WS_VISIBLE|WS_CHILD|WS_BORDER|ES_AUTOHSCROLL,
                               860,400,200,20,
                               hwnd, (HMENU) ID_TEXTBOX, NULL, NULL);
                  CreateWindow(TEXT("button"), TEXT("Submit"),
                               WS_VISIBLE|WS_CHILD,
                               630,500,120,30,
                               hwnd, (HMENU) ID_BTN, NULL, NULL);
                               break;
                               
                         
                                           
             }
        case WM_COMMAND:
        {
             //action for button
             if (LOWORD(wParam) == ID_BTN)
             {
                //create variables
                int length = GetWindowTextLength(hwndTextbox) + 1;
                static char title2[500] = "";
                GetWindowText(hwndTextbox,title2,length);
                //MessageBox(hwnd, title, "Debug Box", MB_OK);
                // Creates a window displaying the text typed in the box.


                //SetWindowText(hwnd, title);
             }
             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);
    }

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

  switch (message)                 
    {
        case WM_CREATE:
             {
                  
                               
                   hwndTextbox = CreateWindow(TEXT("EDIT"), TEXT("Start Date"),
                               WS_VISIBLE|WS_CHILD,
                               390,360,200,20,
                               hwnd, (HMENU) ID_TEXTBOX, NULL, NULL);            
                   hwndTextbox = CreateWindow(TEXT("EDIT"), TEXT(""),
                               WS_VISIBLE|WS_CHILD|WS_BORDER|ES_AUTOHSCROLL,
                               330,400,200,20,
                               hwnd, (HMENU) ID_TEXTBOX, NULL, NULL);            
                 
                               break;
             }
        case WM_COMMAND:
        {
             //action for button
             if (LOWORD(wParam) == ID_BTN)
             {
                //create variables
                int length = GetWindowTextLength(hwndTextbox) + 1;
                static char title[500] = "";
                GetWindowText(hwndTextbox,title,length);
                //MessageBox(hwnd, title, "Debug Box", MB_OK);
                // Creates a window displaying the text typed in the box.


               // SetWindowText(hwnd, title);
             }
             break;
        }
        case WM_DESTROY:
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            break;
            
            
                         /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
       
    }
    
    
    return 0;
}
Thomas1965 (4571)
I think the easiest way is to draw the bitmap in the WM_PAINT msg handler - like so.
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#include <windows.h>
#include <tchar.h>

LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);
char szClassName[] = "MyFirstProgram";
HINSTANCE g_hInst;

void ShowLastWinError()
{
  DWORD err = GetLastError();
  if (err == ERROR_SUCCESS)
  {
    MessageBox(NULL, _T("The was no error :)"), _T("Notice"), MB_OK);
    return;
  }
  TCHAR *msg;
  FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER |
    FORMAT_MESSAGE_FROM_SYSTEM,
    NULL, err, 0, (LPTSTR)&msg, 1024, NULL);
  MessageBox(NULL, msg, _T("Windows Error"), MB_OK | MB_ICONERROR);
  LocalFree((HLOCAL)msg);
}

int WINAPI WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nFunsterStil)
{
  HWND hwnd;              
  MSG messages;           
  WNDCLASSEXA wincl = {0};

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


  /* The class is registered, let''s create the program*/
  hwnd = CreateWindowExA(
    0,                   /* Extended possibilites for variation */
    szClassName,         /* Classname */
    "Quality",       /* Title Text */
    WS_OVERLAPPEDWINDOW, /* default window */
    CW_USEDEFAULT,       /* Windows decides the position */
    CW_USEDEFAULT,       /* where the window ends up on the screen */
    800,                 /* The programs width */
    600,                  /* 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, SW_SHOW);
  UpdateWindow(hwnd);


  /* 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)
{
  static HBITMAP hBgImage = NULL;

  switch (message)                  /* handle the messages */
  {
    case WM_CREATE:
    {
      hBgImage = (HBITMAP)LoadImage(g_hInst, _T("global8000.bmp"), IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
      if (hBgImage == NULL)
        ShowLastWinError();

      break;
    }
    case WM_PAINT:
      PAINTSTRUCT     ps;
      HDC             hdc;
      BITMAP          bitmap;
      HDC             hdcMem;
      HGDIOBJ         oldBitmap;

      hdc = BeginPaint(hWnd, &ps);

      hdcMem = CreateCompatibleDC(hdc);
      oldBitmap = SelectObject(hdcMem, hBgImage);

      GetObject(hBgImage, sizeof(bitmap), &bitmap);
      BitBlt(hdc, 0, 0, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);

      SelectObject(hdcMem, oldBitmap);
      DeleteDC(hdcMem);

      EndPaint(hWnd, &ps);
      return 0;
    case WM_COMMAND:
    {
      break;
    }
    case WM_DESTROY:
      if (hBgImage != NULL)
        DeleteObject(hBgImage);
      PostQuitMessage(0);
      return 0;
    default: 
      break;
  }
  return DefWindowProc(hWnd, message, wParam, lParam);
}

BTW. The Win API isn't easy to use and it's also very old.
Just copying some code without understanding won't work.
Would you consider sth. else ?
http://www.wpf-tutorial.com/
https://www.wpftutorial.net/
closed account (E0p9LyTq)
Why do you have two WNDPROC functions? Only one is needed. I'd be surprised if your program even compiles.

Using a bitmap as a brush is more complicated than just loading it, casting it to a brush and painting with it. Especially as the hbrBackground element of the WNDCLASS/WNDCLASSEX structure. Easier to do it is your window procedure.

Where do you handle WM_PAINT messages? Even if you successfully load the bitmap into your WNDCLASSEX structure if you don't handle WM_PAINT messages you won't see the background.

In your window procedure load your bitmap as a HBITMAP in the WM_CREATE handler and BltBit it to your window's background when you process the WM_PAINT message.
aseagle (11)
@FurryGuy it does compile. As for why, it's because I am trying different things I see on the internet and forgetting to delete everything when I am done. I left it in by accident, but didn't notice because it still compiles.
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