Knap i ren kode

du kan bruge lidt windows api. Kig på http://msdn.microsoft.com/library/en-us/winui/winui/windowsuserinterface/windowing/windows/windowreference/windowfunctions/createwindow.asp?frame=true

Det vil ikke virke...
Her er koden jeg kopierer ind i min .cpp fil:

hwndButton = CreateWindow(
    "BUTTON",  // predefined class
    "OK",      // button text
    WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,  // styles

    // Size and position values are given explicitly, because
    // the CW_USEDEFAULT constant gives zero values for buttons.
    10,        // starting x position
    10,        // starting y position
    100,        // button width
    100,        // button height
    hwnd,      // parent window
    NULL,      // No menu
    (HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),
    NULL);      // pointer not needed

Her er compiler loggen:

Executing  g++.exe...
g++.exe "C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp" -o "C:\Documents and Settings\MigSelv\Skrivebord\knap.exe"  -s  -I"C:\Programmer\Dev-CPP\include"  -I"C:\Programmer\Dev-CPP\include\g++-3"  -I"C:\Programmer\Dev-CPP\include"  -L"C:\Programmer\Dev-CPP\lib"
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:1: ANSI C++ forbids declaration `hwndButton' with no type
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:4: `WS_VISIBLE' was not declared in this scope
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:4: `WS_CHILD' was not declared in this scope
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:4: `BS_DEFPUSHBUTTON' was not declared in this scope
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:12: `hwnd' was not declared in this scope
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:13: `NULL' was not declared in this scope
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:14: `HINSTANCE' was not declared in this scope
C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp:14: parse error before `('

Execution terminated

du har lavet en variabel uden at fortælle hvilken type det skal være, prøv:
HWND hwndButton = CreateWindow(...

generelt så kig altid på den øverste fejl som compileren hoster op med.

desuden skal du huske at inkludere windows.h, altså

#include <windows.h> //bør vist nok stå øverst i din inklude liste

Får nu følgene fejl:

14 C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp
`hwnd' was not declared in this scope

og

16 C:\Documents and Settings\MigSelv\Skrivebord\knap.cpp
`hwnd' was not declared in this scope

PS. Er lige startet på C++ idag så jeg er ret newbie...

BTW. Min kode er nu:

#include <windows.h>

HWND hwndButton = CreateWindow(
    "BUTTON",  // predefined class
    "OK",      // button text
    WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON,  // styles

    // Size and position values are given explicitly, because
    // the CW_USEDEFAULT constant gives zero values for buttons.
    10,        // starting x position
    10,        // starting y position
    100,        // button width
    100,        // button height
    hwnd,      // parent window
    NULL,      // No menu
    (HINSTANCE) GetWindowLong(hwnd, GWL_HINSTANCE),
    NULL);      // pointer not needed

er der ikke mere kode ???

Nop, det er bare en test, jeg skal nemlig lave en knap.
Hvis du kender en nemmere måde så sige endelig til...

nemmere er det ikke... :-)
men mere korrekt:
#include <windows.h>

const char g_szClassName[] = "myWindowClass";
HWND hwndButton;

// Step 4: the Window Procedure
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
  switch(msg)
  {
      case WM_CREATE:
        hwndButton = CreateWindow("BUTTON", "OK", WS_VISIBLE | WS_CHILD | BS_DEFPUSHBUTTON, 10, 10, 100, 100, hwnd, NULL, NULL, NULL);
        break;
       
      case WM_CLOSE:
        DestroyWindow(hwnd);
        break;
       
      case WM_DESTROY:
        PostQuitMessage(0);
        break;
       
      default:
        return DefWindowProc(hwnd, msg, wParam, lParam);
  }
  return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                  LPSTR lpCmdLine, int nCmdShow)
{
  WNDCLASSEX wc;
  HWND hwnd;
  MSG Msg;
 
  //Step 1: Registering the Window Class
  wc.cbSize        = sizeof(WNDCLASSEX);
  wc.style        = 0;
  wc.lpfnWndProc  = WndProc;
  wc.cbClsExtra    = 0;
  wc.cbWndExtra    = 0;
  wc.hInstance    = hInstance;
  wc.hIcon        = LoadIcon(NULL, IDI_APPLICATION);
  wc.hCursor      = LoadCursor(NULL, IDC_ARROW);
  wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
  wc.lpszMenuName  = NULL;
  wc.lpszClassName = g_szClassName;
  wc.hIconSm      = LoadIcon(NULL, IDI_APPLICATION);
 
  if(!RegisterClassEx(&wc))
  {
      MessageBox(NULL, "Window Registration Failed!", "Error!",
                MB_ICONEXCLAMATION | MB_OK);
      return 0;
  }
 
  // Step 2: Creating the Window
  hwnd = CreateWindowEx(
      WS_EX_CLIENTEDGE,
      g_szClassName,
      "The title of my window",
      WS_OVERLAPPEDWINDOW,
        CW_USEDEFAULT, CW_USEDEFAULT, 300, 300,
      NULL, NULL, hInstance, NULL);
 
  if(hwnd == NULL)
    {
      MessageBox(NULL, "Window Creation Failed!", "Error!",
                  MB_ICONEXCLAMATION | MB_OK);
      return 0;
    }
 
  ShowWindow(hwnd, nCmdShow);
  UpdateWindow(hwnd);
 
  // Step 3: The Message Loop
  while(GetMessage(&Msg, NULL, 0, 0) > 0)
  {
      TranslateMessage(&Msg);
      DispatchMessage(&Msg);
  }
  return Msg.wParam;
}

koden er et lettere modificeret eksempel fra:
http://www.winprog.org/tutorial/

Okay, tak tak... men kandet slet ikke laves nemmere?
Det er ret meget kode for én knap synes jeg...

kan det even

det er vist det simpleste man kan lave:

#include <windows.h>

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
  MessageBox(NULL, "Bøøøøøhhh!", "Besked fra program:", MB_OK);
  return 0;
}

Ok
Du for pointene, tak for hjælpen