chúng ta tạo 1 button và điều chỉnh button đó bằng 4 nút.
source code như sau:
#if defined(UNICODE) && !defined(_UNICODE)
#define _UNICODE
#elif defined(_UNICODE) && !defined(UNICODE)
#define UNICODE
#endif
#include <tchar.h>
#include <windows.h>
/* Declare Windows procedure */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);
HWND textfield, button;
int x=100,y=100;
void reset_key()
{
if(x<0)
{
x=0;
}
if(y<0)
{
y=0;
}
if(x>450)
{
x=450;
}
if(y>470)
{
y=470;
}
}
/* Make the class name into a global variable */
TCHAR szClassName[ ] = _T("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 */
_T("Quynh - application 1"), /* Title Text */
WS_MINIMIZEBOX|WS_SYSMENU, /* not change window */
CW_USEDEFAULT, /* Windows decides the position */
CW_USEDEFAULT, /* where the window ends up on the screen */
500, /* The programs width */
500, /* 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;
}
/* 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:
button = CreateWindow("BUTTON","0",
WS_VISIBLE|WS_CHILD|WS_BORDER,
y,x,25,25,
hwnd,NULL,NULL,NULL);
break;
case WM_DESTROY:
PostQuitMessage (0); /* send a WM_QUIT to the message queue */
break;
case WM_KEYDOWN:
//Hide button
// EnableWindow( button, false);
ShowWindow(button,SW_HIDE);
//Press key up key: moview button
if (GetAsyncKeyState(VK_UP)){
x = x-25;
reset_key();
ShowWindow(button,SW_HIDE);
button =CreateWindow("BUTTON","0",
WS_VISIBLE|WS_CHILD|WS_BORDER,
y,x,25,25,
hwnd,NULL,NULL,NULL);
}
//Press Key down
if (GetAsyncKeyState(VK_DOWN)){
x = x+25;
reset_key(); ShowWindow(button,SW_HIDE);
button =CreateWindow("BUTTON","0",
WS_VISIBLE|WS_CHILD|WS_BORDER,
y,x,25,25,
hwnd,NULL,NULL,NULL);
}
//Key left
if (GetAsyncKeyState(VK_LEFT)){
y= y-25;
reset_key(); ShowWindow(button,SW_HIDE);
button =CreateWindow("BUTTON","0",
WS_VISIBLE|WS_CHILD|WS_BORDER,
y,x,25,25,
hwnd,NULL,NULL,NULL);
}
//Key right
if (GetAsyncKeyState(VK_RIGHT)){
y= y+25;
reset_key(); ShowWindow(button,SW_HIDE);
button =CreateWindow("BUTTON","0",
WS_VISIBLE|WS_CHILD|WS_BORDER,
y,x,25,25,
hwnd,NULL,NULL,NULL);
}
break;
default: /* for messages that we don't deal with */
return DefWindowProc (hwnd, message, wParam, lParam);
}
return 0;
}
