#include <windows.h>#include <windowsx.h>#include <stdio.h>#include <ddraw.h>#include <math.h>#include "ddutil.h"#define TITLE "截圖示例" //窗口標題#define CLASSNAME "GetScreen" //窗口類名#define COLORS 16HINSTANCE hInst; //應(yīng)用程序?qū)嵗浔鶫WND hWndMain; //主窗口句柄LPDIRECTDRAW      lpDD;      // DirectDraw對象LPDIRECTDRAWSURFACE   lpDDSPrimary;  // 主頁面LPDIRECTDRAWSURFACE   lpDDSBack;   // 后臺緩沖區(qū)LPDIRECTDRAWSURFACE   lpDDSPic1;   // 離屏頁面1LPDIRECTDRAWPALETTE   lpDDPal;    // 調(diào)色板BOOL          bActive;    // 應(yīng)用程序是否活躍?HBITMAP hbm;RECT rect;//函數(shù)聲明void FreeObjects( void );BOOL InitDDraw(void);BOOL InitSurfaces(void);void UpdateFrame(void);void MakeRect(RECT *rect, long left, long top, long right, long bottom);///////////////////////////////////////////////// 截圖函數(shù)，是本程序的關(guān)鍵// 函數(shù)名：GetScreen// 參數(shù)：指向屏幕矩形的指針// 返值：Bitmap設(shè)備//////////////////////////////////////////////HANDLE GetScreen(LPRECT lpRect){ //定義屏幕的DC和內(nèi)存DC HDC hScrDC,hMemDC; //定義Bitmap設(shè)備 HANDLE hBitmap,hOldBitmap; //定義屏幕坐標變量 unsigned int nX,nY,nX2,nY2; unsigned int nWidth,nHeight; //定義屏幕分辯率變量 unsigned int xScrn,yScrn; //確保屏幕矩形不為空 if(IsRectEmpty(lpRect)) return NULL; //創(chuàng)建屏幕的DC hScrDC=CreateDC("DISPLAY",NULL,NULL,NULL); //創(chuàng)建的內(nèi)存DC hMemDC=CreateCompatibleDC(hScrDC); //將屏幕矩形坐標付給坐標變量 nX=lpRect->left; nY=lpRect->top ; nX2=lpRect->right ; nY2=lpRect->bottom ; //獲得屏幕分辯率 xScrn=GetDeviceCaps(hScrDC,HORZRES); yScrn=GetDeviceCaps(hScrDC,VERTRES); if(nX<0) nX=0; if(nY<0) nY=0; if(nX2>xScrn) nX2=xScrn; if(nY2>yScrn) nY2=yScrn; //獲得屏幕寬度與長度 nWidth=nX2-nX; nHeight=nY2-nY; //獲得屏幕圖像并付給一個Bitmap設(shè)備 hBitmap=CreateCompatibleBitmap(hScrDC,nWidth,nHeight); hOldBitmap=(HBITMAP)SelectObject(hMemDC,hBitmap); BitBlt(hMemDC,0,0,nWidth,nHeight,hScrDC,nX,nY,SRCCOPY); hBitmap=(HBITMAP)SelectObject(hMemDC,hOldBitmap); //清除設(shè)備 DeleteDC(hScrDC); DeleteDC(hMemDC); return hBitmap;}//*******************************************************************//函數(shù)：FreeObject//功能：釋放所有DirectDraw對象//*******************************************************************void FreeObjects( void ){ //釋放hbm位圖對象  DeleteObject(hbm);  if( lpDD != NULL )//釋放DirectDraw對象  {    if( lpDDSPrimary != NULL )//釋放主頁面    {      lpDDSPrimary->Release();      lpDDSPrimary = NULL;    }    if( lpDDSPic1 != NULL )//釋放離屏頁面1    {      lpDDSPic1->Release();      lpDDSPic1 = NULL;    }    if( lpDDPal != NULL )//釋放調(diào)色板    {      lpDDPal->Release();      lpDDPal = NULL;    }    lpDD->Release();    lpDD = NULL;  }} //*******************************************************************//函數(shù)：RestoreAll//功能：頁面丟失后，恢復(fù)頁面內(nèi)存//*******************************************************************HRESULT RestoreAll( void ){  HRESULT   ddrval; //恢復(fù)主頁面，這也將恢復(fù)換頁鏈中的所有頁面  ddrval = lpDDSPrimary->Restore(); //恢復(fù)離屏頁面  ddrval = lpDDSPic1->Restore(); //重新繪制頁面圖象 InitSurfaces();  return ddrval;}//*******************************************************************//函數(shù)：WindowProc//功能：主窗口的消息處理過程//*******************************************************************LRESULT CALLBACK WinProc( HWND hWnd, UINT message,               WPARAM wParam, LPARAM lParam ){  switch( message )  {  case WM_SETCURSOR: SetCursor(LoadCursor( NULL, IDC_ARROW )); return TRUE;  case WM_ACTIVATEAPP://應(yīng)用程序激活消息    bActive = wParam;    break;  case WM_KEYDOWN://擊鍵消息    switch( wParam )    {    case VK_ESCAPE:      PostMessage(hWnd, WM_CLOSE, 0, 0);      break; }    break;  case WM_DESTROY://銷毀窗口消息    FreeObjects();    PostQuitMessage(0);    break;  } //調(diào)用缺省的過程處理過程  return DefWindowProc(hWnd, message, wParam, lParam);}//******************************************************************//函數(shù)：InitWindow()//功能：創(chuàng)建主窗口。//******************************************************************BOOL InitWindow( HINSTANCE hInstance, int nCmdShow ){  WNDCLASS wc; //窗口類結(jié)構(gòu) //填充窗口類結(jié)構(gòu)  wc.style = 0;  wc.lpfnWndProc = WinProc;  wc.cbClsExtra = 0;  wc.cbWndExtra = 0;  wc.hInstance = hInstance;  wc.hIcon = LoadIcon( hInstance, IDI_APPLICATION );  wc.hCursor = LoadCursor( NULL, IDC_ARROW );  wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);//選擇黑色刷做為窗口背景  wc.lpszMenuName = NULL; wc.lpszClassName = CLASSNAME; //注冊窗口類  RegisterClass( &wc ); //創(chuàng)建主窗口  hWndMain= CreateWindowEx( 0, CLASSNAME, //窗口的類名稱，必須與上面的wc.lpszClassName一致 TITLE, //窗口的標題名 WS_POPUP, 0, 0, GetSystemMetrics( SM_CXSCREEN ), GetSystemMetrics( SM_CYSCREEN ), NULL, NULL, hInstance, NULL );  if( !hWndMain )  return FALSE; //顯示并更新窗口  ShowWindow( hWndMain, nCmdShow ); return TRUE;}//******************************************************************//函數(shù)：InitDDraw()//功能：初始化DirectDraw環(huán)境，創(chuàng)建換頁鏈（主頁面，一個后臺緩沖區(qū)）// 以及創(chuàng)建一個定時器。//******************************************************************BOOL InitDDraw(void){  DDSURFACEDESC    ddsd;  DDSCAPS       ddscaps;  HRESULT       ddrval;  //創(chuàng)建DirectDraw對象 ddrval = DirectDrawCreate( NULL, &lpDD, NULL );  if( ddrval != DD_OK )    return FALSE;  //取得全屏獨占模式  ddrval = lpDD->SetCooperativeLevel( hWndMain, DDSCL_EXCLUSIVE | DDSCL_FULLSCREEN );  if( ddrval != DD_OK )    return FALSE;  //設(shè)置顯示器顯示模式為當前屏幕的分辯率，16位增強顯示模式  ddrval = lpDD->SetDisplayMode(GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN), COLORS);  if( ddrval != DD_OK )    return FALSE;  //填充換頁鏈結(jié)構(gòu)  ddsd.dwSize = sizeof( ddsd );  ddsd.dwFlags = DDSD_CAPS | DDSD_BACKBUFFERCOUNT;  ddsd.ddsCaps.dwCaps = DDSCAPS_PRIMARYSURFACE |             DDSCAPS_FLIP |             DDSCAPS_COMPLEX; //后臺緩沖區(qū)數(shù)量為2  ddsd.dwBackBufferCount = 2; //創(chuàng)建換頁鏈，包括了主頁面及其后臺緩沖區(qū)  ddrval = lpDD->CreateSurface( &ddsd, &lpDDSPrimary, NULL );  if( ddrval != DD_OK )    return FALSE;  //獲得指向后臺緩沖區(qū)的頁面指針 ddscaps.dwCaps = DDSCAPS_BACKBUFFER;  ddrval = lpDDSPrimary->GetAttachedSurface(&ddscaps, &lpDDSBack);  if( ddrval != DD_OK )    return FALSE; //創(chuàng)建離屏頁面 ZeroMemory(&ddsd, sizeof(ddsd));  ddsd.dwSize = sizeof(ddsd);  ddsd.dwFlags = DDSD_CAPS | DDSD_HEIGHT |DDSD_WIDTH;  ddsd.ddsCaps.dwCaps = DDSCAPS_OFFSCREENPLAIN;  ddsd.dwWidth =GetSystemMetrics(SM_CXSCREEN);  ddsd.dwHeight = GetSystemMetrics(SM_CYSCREEN);  if (lpDD->CreateSurface(&ddsd, &lpDDSPic1, NULL) != DD_OK) return FALSE; //調(diào)用頁面初始化函數(shù) if( !InitSurfaces() )    return FALSE;  return TRUE;}//******************************************************************//函數(shù)：WinMain()//功能：應(yīng)用程序入口//******************************************************************int PASCAL WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine, int nCmdShow){  MSG  msg; hInst=hInstance; //獲得屏幕分辯率 rect.left=rect.top=0; rect.right=GetSystemMetrics(SM_CXSCREEN); rect.bottom=GetSystemMetrics(SM_CYSCREEN); //調(diào)用截屏函數(shù) hbm=(HBITMAP)GetScreen(&rect); //初始化主窗口 if (!InitWindow( hInstance, nCmdShow))  return FALSE; //初始化DirectDraw環(huán)境 if (!InitDDraw()) { MessageBox(hWndMain, "初始化DirectDraw過程中出錯！", "Error", MB_OK); FreeObjects(); DestroyWindow(hWndMain); return FALSE; } //進入消息循環(huán) while(1) { if(PeekMessage(&msg, NULL, 0, 0, PM_NOREMOVE)) {  if(!GetMessage(&msg, NULL, 0, 0 ))  return msg.wParam;  TranslateMessage(&msg);   DispatchMessage(&msg); } else if(bActive) {  UpdateFrame(); } else WaitMessage(); }  return msg.wParam;} //******************************************************************//函數(shù)：InitSurfaces()//功能：初始化頁面圖象//******************************************************************BOOL InitSurfaces( void ){ if (hbm == NULL) return FALSE; DDCopyBitmap(lpDDSPic1, hbm, 0, 0, GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));  return TRUE;}//更新屏幕void UpdateFrame( void ){ HRESULT ddrval; //清屏后臺緩沖區(qū) DDBLTFX ddBltFx; ddBltFx.dwSize = sizeof(DDBLTFX); ddBltFx.dwFillColor = DDColorMatch(lpDDSBack, RGB(0,0,0)); lpDDSBack->Blt(NULL, NULL, NULL, DDBLT_WAIT | DDBLT_COLORFILL, &ddBltFx); //調(diào)用灰度的實現(xiàn)函數(shù) RECT srect, drect; MakeRect(&srect, 0, 0, rect.right ,rect.bottom); MakeRect(&drect, 0, 0, rect.right , rect.bottom); //將背景圖象Blit到后臺緩沖區(qū) lpDDSBack->Blt(&drect, lpDDSPic1, &srect, DDBLT_WAIT, NULL);  // 換頁  while( 1 )  {    ddrval = lpDDSPrimary->Flip( NULL, DDFLIP_WAIT );//調(diào)用換頁函數(shù)    if( ddrval == DD_OK )//成功則退出while循環(huán)      break;    else if( ddrval == DDERR_SURFACELOST )//如果頁面丟失，則恢復(fù)頁面，再繼續(xù)while循環(huán)      RestoreAll();    else  break; }}void MakeRect(RECT *rect, long left, long top, long right, long bottom){ rect->left=left; rect->top=top; rect->right=right; rect->bottom=bottom;}