向高手提问……

[Learn-anything]

1、你有没有遇到过类似下面的这个链接错误？如果遇到过，简单说说它是怎么回事，你又是怎么解决的？
error LNK2019: 无法解析的外部符号 _function1，该符号在函数 _ function2中被引用


2、使用Win32(不用MFC或其他框架),写一个窗口程序，实现下列功能:
(1)，窗口启动时最大化
(2)，窗口的背景为蓝色
(3)，当鼠标在窗口上移动时，在窗口的左上角显示鼠标相对于窗口客户区左上角的坐标
(4)，从Cards.dll中加载一张扑克牌，最初显示在窗口的中间（提示: Cards.dll在系统盘下的Windows\system32下可以找到）,按下上下左右键后，这张 扑克可以在窗口内上下左右移动，每按一次，移动一个像素。并且保证这张扑克不会移动到窗口外面去。




请高手做下这两题，非常感谢……

[星羽]

1） .确保xxxx.lib能正确的链接到工程中.

[星羽]

2）建个win32工程

// win32.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 main window class name

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

HBITMAP g_hImage = 0;
POINT g_cards;
HWND hWnd;

int APIENTRY _tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
	UNREFERENCED_PARAMETER(hPrevInstance);
	UNREFERENCED_PARAMETER(lpCmdLine);

 	// TODO: Place code here.
	MSG msg;
	HACCEL hAccelTable;

	// Initialize global strings
	LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
	LoadString(hInstance, IDC_WIN32, szWindowClass, MAX_LOADSTRING);
	MyRegisterClass(hInstance);

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

	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_WIN32));

    HMODULE handel = LoadLibrary(TEXT("Cards.dll"));   
    g_hImage = LoadBitmap(handel,  MAKEINTRESOURCE(52));

    RECT rect;
    GetClientRect(hWnd, &rect);
    g_cards.x = rect.right / 2 - 50;
    g_cards.y = rect.bottom / 2 - 100;

    InvalidateRect(hWnd, NULL, TRUE);

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

	return (int) msg.wParam;
}



//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
//    This function and its usage are 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;
	wcex.cbClsExtra		= 0;
	wcex.cbWndExtra		= 0;
	wcex.hInstance		= hInstance;
	wcex.hIcon			= LoadIcon(hInstance, MAKEINTRESOURCE(IDI_WIN32));
	wcex.hCursor		= LoadCursor(NULL, IDC_ARROW);
	wcex.hbrBackground	= (HBRUSH)CreateSolidBrush(RGB(0, 0, 255));
	wcex.lpszMenuName	= MAKEINTRESOURCE(IDC_WIN32);
	wcex.lpszClassName	= szWindowClass;
	wcex.hIconSm		= LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL));

	return RegisterClassEx(&wcex);
}

//
//   FUNCTION: InitInstance(HINSTANCE, 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)
{
   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, SW_MAXIMIZE);
   UpdateWindow(hWnd);

   return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  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
//
//

LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	int wmId, wmEvent;
	PAINTSTRUCT ps;
	HDC hdc;

	switch (message)
	{
	case WM_COMMAND:
		wmId    = LOWORD(wParam);
		wmEvent = HIWORD(wParam);
		// Parse the menu selections:
		switch (wmId)
		{
		case IDM_ABOUT:
			DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About);
			break;
		case IDM_EXIT:
			DestroyWindow(hWnd);
			break;
		default:
			return DefWindowProc(hWnd, message, wParam, lParam);
		}
		break;
	case WM_PAINT:
		hdc = BeginPaint(hWnd, &ps);
        {
            POINT pt;
            GetCursorPos(&pt);
            ScreenToClient(hWnd, &pt);
            TCHAR str[128];
            _stprintf(str, TEXT("x = %d, y = %d"), pt.x, pt.y);
            SetBkColor(hdc, RGB(0, 0, 255));
            SetTextColor(hdc, RGB(255, 255, 255));
            TextOut(hdc, 10, 10, str, _tcslen(str));

            HDC hcdc = CreateCompatibleDC(hdc);
            HGDIOBJ hSave = SelectObject(hcdc, g_hImage);
            BitBlt(hdc, g_cards.x, g_cards.y, 100, 100, hcdc, 0, 0, SRCCOPY);
            SelectObject(hcdc, hSave);
            ReleaseDC(hWnd, hcdc);

        }
		EndPaint(hWnd, &ps);
		break;
    
    case WM_MOUSEMOVE :
        {
            RECT rect = {0, 0, 200, 100};
            InvalidateRect(hWnd, &rect, TRUE);
        }
        break;

    case WM_KEYDOWN :
        {
            RECT rect = {g_cards.x - 10, g_cards.y -10, g_cards.x + 100, g_cards.y + 200};

            switch (wParam) 
            {
            case VK_LEFT :
                --g_cards.x;
                break;
            case VK_RIGHT :
                ++g_cards.x;
                break;
            case VK_UP :
                --g_cards.y;
                break;
            case VK_DOWN :
                ++g_cards.y;
                break;
            }

            InvalidateRect(hWnd, &rect, TRUE);

        }

        break;

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

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

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

[珍惜生命远离CPP]

1 增加函数实现,或者lib
2 自动生成的向导已经由了大部分的功能.

[薛定谔之死猫]

1.添加函数的源代码参与编译，或者添加包含函数代码的lib，或者包含函数dll实现描述的lib
2.很多sdk的示例程序就做这样的实例，加载扑克牌主要训练使用资源dll，找找相关例子程序