C++游戏编程基础，平面地图，求教！谢谢啊~~

我是初学者，最近在看《VisualC++游戏编程基础》，学到了平面地图绘制这里。我照着书中代码做的可是结果出不来。代码我会复制下来。我知道是我复制图片到工程的方法不对，还是怎么回事，三种颜色的图片块，只能显示一种,是不是循环错呢?超级纠结。单步调试到sprintf()函数的时候还会出现Find Source对话框。内容是Please enter the path for SPRINTF.C~~这又是什么原因呢？
请大家帮帮我吧，谢谢大家!!

C/C++ code

#include "stdafx.h"#include "resource.h"#include "stdio.h"// Global Variables:HINSTANCE hInst;                                // current instanceHBITMAP fullmap;//声明图块贴图，完成地图拼接HDC mdc;const int rows =8,cols=8;//定义地图上的行列，// Foward declarations of functions included in this code module:ATOM                MyRegisterClass(HINSTANCE hInstance);BOOL                InitInstance(HINSTANCE, int);LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);void MyPaint(HDC hdc);int APIENTRY WinMain(HINSTANCE hInstance,                     HINSTANCE hPrevInstance,                     LPSTR     lpCmdLine,                     int       nCmdShow){     // TODO: Place code here.    MSG msg;    HACCEL hAccelTable;    MyRegisterClass(hInstance);    // Perform application initialization:    if (!InitInstance (hInstance, nCmdShow))     {        return FALSE;    }    hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_CH2_9);    // Main message loop:    while (GetMessage(&msg, NULL, 0, 0))     {        if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))         {            TranslateMessage(&msg);            DispatchMessage(&msg);        }    }    return msg.wParam;}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            = NULL;//LoadIcon(hInstance, (LPCTSTR)IDI_CH2_9);    wcex.hCursor        = LoadCursor(NULL, IDC_ARROW);    wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1);    wcex.lpszMenuName    = NULL;//(LPCSTR)IDC_CH2_9;    wcex.lpszClassName    = "canvas";    wcex.hIconSm        = NULL;//LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);    return RegisterClassEx(&wcex);}BOOL InitInstance(HINSTANCE hInstance, int nCmdShow){   HWND hWnd;   hInst = hInstance; // Store instance handle in our global variable    HDC hdc,bufdc;   hWnd = CreateWindow("canvas", "平面地图", WS_OVERLAPPEDWINDOW,      CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);   if (!hWnd)   {      return FALSE;   }   MoveWindow(hWnd,10,10,430,450,true);   ShowWindow(hWnd, nCmdShow);   UpdateWindow(hWnd);   int mapIndex[rows*cols]={2,2,2,2,0,1,0,1,//第一row                    0,2,2,0,0,0,1,1,                    0,0,0,0,0,0,0,1,                    2,0,0,0,0,0,2,2,                    2,0,0,0,2,2,0,0,                    0,0,2,2,2,0,0,1,                    0,0,2,0,0,0,1,1,};    hdc=GetDC(hWnd);    mdc=CreateCompatibleDC(hdc);    bufdc=CreateCompatibleDC(hdc);    fullmap=CreateCompatibleBitmap(hdc,cols*50,rows*50);//建立fullmap空位图宽：列数*图片宽；高：行*图高    SelectObject(mdc,fullmap);    HBITMAP map[3];    char filename[20]="";    int rowNum,colNum;    int x,y,i;    //加载各图块位图    for (i=0;i<3;i++)    {        sprintf(filename,"map%d.bmp",i);        map[i]=(HBITMAP)LoadImage(NULL,filename,IMAGE_BITMAP,50,50,LR_LOADFROMFILE);    }//利用循环转换图片的文件名，取出各个图块存在map[]中；    //按照mapIndex数组中的定义取出对应的图块，进行地图拼接；    for (i=0;i<rows*cols;i++)    {        SelectObject(bufdc,map[mapIndex[i]]);        rowNum=i/cols;        colNum=i%cols;        x=colNum*50;        y=colNum*50;        BitBlt(mdc,x,y,50,50,bufdc,0,0,SRCCOPY);    }    MyPaint(hdc);    ReleaseDC(hWnd,hdc);    DeleteDC(bufdc);   return TRUE;}void MyPaint(HDC hdc){    SelectObject(mdc,fullmap);    BitBlt(hdc,10,10,cols*50,rows*50,mdc,0,0,SRCCOPY);}LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam){    PAINTSTRUCT ps;    HDC hdc;    switch (message)     {    case WM_PAINT:            hdc = BeginPaint(hWnd, &ps);            // TODO: Add any drawing code here...            MyPaint(hdc);                EndPaint(hWnd, &ps);            break;        case WM_DESTROY:            DeleteDC(mdc);            DeleteObject(fullmap);            PostQuitMessage(0);            break;        default:            return DefWindowProc(hWnd, message, wParam, lParam);   }   return 0;} 
 

[解决办法]
for (i=0;i<rows*cols;i++)
{
SelectObject(bufdc,map[mapIndex[i]]);
rowNum=i/cols;
colNum=i%cols;
x=colNum*50;
y=rowNum*50;

BitBlt(mdc,x,y,50,50,bufdc,0,0,SRCCOPY);
}