kéo lê đối tượng bằng cách xóa và vẽ lại (chương 7)

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kéo lê đối tượng bằng cách xóa và vẽ lại (chương 7)

Bài gửi by nth on 11/05/10, 10:06 pm

Bài này kì thật. Sao tìm mãi không thấy IDB_HEART? (báo lỗi)

// ObjectDrag.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE hInst; // current instance
TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text

// Foward declarations of functions included in this code module:
ATOM MyRegisterClass(HINSTANCE hInstance);
BOOL InitInstance(HINSTANCE, int);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);

int APIENTRY WinMain(HINSTANCE hInstance,
HINSTANCE hPrevInstance,
LPSTR lpCmdLine,
int nCmdShow)
{
// TODO: Place code here.
MSG msg;
HACCEL hAccelTable;

// Initialize global strings
LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
LoadString(hInstance, IDC_OBJECTDRAG, szWindowClass, MAX_LOADSTRING);
MyRegisterClass(hInstance);

// Perform application initialization:
if (!InitInstance (hInstance, nCmdShow))
{
return FALSE;
}

hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_OBJECTDRAG);

// Main message loop:
while (GetMessage(&msg, NULL, 0, 0))
{
if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

return msg.wParam;
}



//
// FUNCTION: MyRegisterClass()
//
// PURPOSE: Registers the window class.
//
// COMMENTS:
//
// This function and its usage is only necessary if you want this code
// to be compatible with Win32 systems prior to the 'RegisterClassEx'
// function that was added to Windows 95. It is important to call this function
// so that the application will get 'well formed' small icons associated
// with it.
//
ATOM MyRegisterClass(HINSTANCE hInstance)
{
WNDCLASSEX wcex;

wcex.cbSize = sizeof(WNDCLASSEX);

wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = (WNDPROC)WndProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = hInstance;
wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_OBJECTDRAG);
wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wcex.lpszMenuName = (LPCSTR)IDC_OBJECTDRAG;
wcex.lpszClassName = szWindowClass;
wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);

return RegisterClassEx(&wcex);
}

//
// FUNCTION: InitInstance(HANDLE, int)
//
// PURPOSE: Saves instance handle and creates main window
//
// COMMENTS:
//
// In this function, we save the instance handle in a global variable and
// create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
HWND hWnd;

hInst = hInstance; // Store instance handle in our global variable

hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);

if (!hWnd)
{
return FALSE;
}

ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);

return TRUE;
}

//
// FUNCTION: WndProc(HWND, unsigned, WORD, LONG)
//
// PURPOSE: Processes messages for the main window.
//
// WM_COMMAND - process the application menu
// WM_PAINT - Paint the main window
// WM_DESTROY - post a quit message and return
//
//

// ==============
bool IsInsideEllipse(int x1, int y1, int x2, int y2, int x, int y)
{
double a = (double(x2)-x1)/2, b = (double(y2)-y1)/2;
if (!a || !b) return false;
double xx = x - (double(x1)+x2)/2, yy = y - (double(y1)+y2)/2;
double xr = xx/a, yr = yy/b;
return xr*xr+yr*yr <= 1;
}
// ==============

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
int wmId, wmEvent;
PAINTSTRUCT ps;
HDC hdc;
TCHAR szHello[MAX_LOADSTRING];
LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING);

// <!==
static HCURSOR hCursorMove;
static x1,y1,x2,y2, px, py;
static HBRUSH hbr;
// ===>

switch (message)
{

// <!==
case WM_CREATE:
RECT rt;
GetClientRect(hWnd, &rt);
x1 = rt.right/4; x2 = 3*rt.right/4;
y1 = rt.bottom/4; y2 = 3*rt.bottom/4;

HBITMAP hBitmap;
hBitmap = LoadBitmap(hInst, (LPCTSTR)IDB_HEART);
hbr = CreatePatternBrush(hBitmap);
DeleteObject(hBitmap);

hCursorMove = LoadCursor(NULL, IDC_SIZEALL);
break;

case WM_LBUTTONDOWN:
int x, y;
px = x = LOWORD(lParam);
py = y = HIWORD(lParam);
if (IsInsideEllipse(x1,y1,x2,y2,x,y))
SetCapture(hWnd);
break;

case WM_LBUTTONUP:
if (GetCapture() == hWnd)
ReleaseCapture();
break;
case WM_MOUSEMOVE:
x = LOWORD(lParam);
y = HIWORD(lParam);
if (IsInsideEllipse(x1,y1,x2,y2,x,y))
{
SetCursor(hCursorMove);
if (GetCapture() == hWnd)
{
int dx = x-px, dy = y-py;
x1 += dx; y1 += dy;
x2 += dx; y2 += dy;
px = x;
py = y;
InvalidateRect(hWnd, NULL, TRUE);
}
}
break;
// ===>

case WM_COMMAND:
wmId = LOWORD(wParam);
wmEvent = HIWORD(wParam);
// Parse the menu selections:
switch (wmId)
{
case IDM_ABOUT:
DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
break;
case IDM_EXIT:
DestroyWindow(hWnd);
break;
                default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
break;
case WM_PAINT:
hdc = BeginPaint(hWnd, &ps);
// TODO: Add any drawing code here...
// RECT rt;
GetClientRect(hWnd, &rt);
DrawText(hdc, szHello, strlen(szHello), &rt, DT_CENTER);

// <!==
SelectObject(hdc, hbr);
Ellipse(hdc,x1,y1,x2,y2);
// ===>

EndPaint(hWnd, &ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
        default:
return DefWindowProc(hWnd, message, wParam, lParam);
}
return 0;
}

// Mesage handler for about box.
LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG:
return TRUE;

case WM_COMMAND:
if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
{
EndDialog(hDlg, LOWORD(wParam));
return TRUE;
}
break;
}
return FALSE;
}


Lỗi:
D:\LapTrinhWindow\ObjectDrag\ObjectDrag.cpp(168) : error C2065: 'IDB_HEART' : undeclared identifier
Error executing cl.exe.
hix.. hog bít nó báo lỗi này là sao nữa

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nth
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