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用Visual C++实现屏幕抓图程序

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 在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示: `ER">@&  
  n:JWu0,h  
  一、实现方法 {~.~ b+v  
T^LpoN/T  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ,at"Q$)T  
xU$A/!oK  
#pragma data_seg("shareddata") n4Fh*d ixg  
HHOOK hHook =NULL; //钩子句柄 >|%dN jf@Q  
UINT nHookCount =0; //挂接的程序数目 / fBi9=}+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Oo'IeXQ9(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 l`9<mL  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey PW(4-H  
static int KeyCount =0; lz>YjK:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 A/n-.ci  
#pragma data_seg() |J: n'}  
([~9v@+  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 om%L>zfB  
.?7u'%6x?{  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: j8p</gd  
z3!j>X_w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR a12Q/K  
cKey,UCHAR cMask) )eFXjnHN  
{ KT1/PWa  
 BOOL bAdded=FALSE; RlH|G  
 for(int index=0;index<MAX_KEY;index++){ V1Yab#  
  if(hCallWnd[index]==0){ P:GAJ->;]>  
   hCallWnd[index]=hWnd; v~|~&Dwq  
   HotKey[index]=cKey; [J0f:&7\  
   HotKeyMask[index]=cMask; +<5q8{]Pk  
   bAdded=TRUE; yWI30hW  
   KeyCount++; S/ YT V  
   break; v{%x,K56  
  } N$1ZA)M  
 } V +#Sb  
 return bAdded; sT.;*3{  
} (,Zy 2wr=  
//删除热键 4 DhGp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EfxW^zm)  
{ *|)a@V L  
 BOOL bRemoved=FALSE; L%G/%*7;c  
 for(int index=0;index<MAX_KEY;index++){ cj ?aCVa  
  if(hCallWnd[index]==hWnd){ ;Du+C%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p,_,o3@~  
    hCallWnd[index]=NULL; WZz8VF  
    HotKey[index]=0; USF9sF0l  
    HotKeyMask[index]=0; Z(Styn/x  
    bRemoved=TRUE; ~s.~X5  
    KeyCount--; 0ws1S(pq  
    break; ^L}ICm_#  
   } ;bz|)[4/  
  } :H9\nU1  
 } Q-A:0F&{t  
 return bRemoved; m\9R;$ \  
} ;#'YO1`gf3  
@VdkmqXz  
nV/8u_  
  DLL中的钩子函数如下: Q7<%_a  
GnAG'.t-Z  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R/!lDv!  
{ 2o8:[3C5  
 BOOL bProcessed=FALSE; K1`Z}k_p.  
 if(HC_ACTION==nCode) \X3Q,\H @  
 { b2L9%8h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Vq8G( <77  
   switch(wParam) c@SNbY4}%  
   {  i rjOGn  
    case VK_MENU: KGM9 b  
     MaskBits&=~ALTBIT; Y.}"<{RQ  
     break; 0.pZlv  
    case VK_CONTROL: #}M\ J0QG  
     MaskBits&=~CTRLBIT; m1pge4*  
     break; X`/GiYTu  
    case VK_SHIFT: '=s{9lxn^  
     MaskBits&=~SHIFTBIT; 9Hu;CKs  
     break; ko-3`hX`  
    default: //judge the key and send message ;2#9q9(  
     break; ni2GZ<1j  
   } W D/\f$4  
   for(int index=0;index<MAX_KEY;index++){ 8 x=J&d  
    if(hCallWnd[index]==NULL) q?R^~r  
     continue; ]et ]Vkg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Oy}^|MFfA  
    { ^"dVz.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?xa70Pb{;  
     bProcessed=TRUE; 34*73WxK  
    } [c^!;YBp)  
   } y ;/T.W9!  
  } HbI'n,+  
  else if((lParam&0xc000ffff)==1){ //有键按下 |~K 5]  
   switch(wParam) H^Mfj!S  
   { Fe[)-_%G  
    case VK_MENU: |?cL>]t  
     MaskBits|=ALTBIT; `e`}dgf0S|  
     break; ^l:~r2  
    case VK_CONTROL: I`~Giz7@  
     MaskBits|=CTRLBIT; c>|1%}"?  
     break; m&P B5s\=  
    case VK_SHIFT: (jyT9'*wAT  
     MaskBits|=SHIFTBIT; }s7@0#j@a  
     break; 3u 'VPF2  
    default: //judge the key and send message t!8(IR  
     break; B_uhNLd  
   } u Gmv`R_  
   for(int index=0;index<MAX_KEY;index++){ -Qy@-s $  
    if(hCallWnd[index]==NULL) %jE0Z4\  
     continue; pqCp>BO?O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }>5R9  
    { }ed{8"bj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #0"Pd8@  
     bProcessed=TRUE; `@<~VWe5  
    } <e?1&56  
   } aMJW__,  
  } <.Dg3RH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]+k]Gbty6  
   for(int index=0;index<MAX_KEY;index++){ mz2v2ma  
    if(hCallWnd[index]==NULL) h S 9^Bi  
     continue; MpVZL29)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6Y%{ YQ}s|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cq`!17"k  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~eZ]LW])  
   } O[|_~v:^  
  } i*]$_\yl"  
 } 8U%y[2sT  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c Cx_tGR"  
} hz+O.k],?  
H -K%F_#  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: .T1n"TfsGO  
h:AB`E1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S^x?<kYQau  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NI:3hfs  
*7w,o?l  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 6zp]SPY  
M+VAol}1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `qV*R 2  
{ }0C v J4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 8Sk$o.Gy  
 { KTE X]  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $!vK#8-&{  
  SaveBmp(); #0f6X,3  
  return FALSE; T<%%f.x[s  
 } <2e[;$  
 …… //其它处理及默认处理 4 'DEdx,&f  
} FOAXm4"  
3ESrd"W=  
9DmFa5E  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 3=("vR`!  
Q0%s|8Jc  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 +xuj]J  
X>i{288M3  
  二、编程步骤 wg4Ol*y'  
!-m 'diE  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; h2 y<vO  
3*E] :l_  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; iB}*<~`.Eg  
k+zskfo  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; M0t9`Z9  
&Z(6i}f,Gp  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; WIN3*z7oW  
!tSh9L;<O  
  5、 添加代码,编译运行程序。 hGcu(kAC,  
l(HxZlHr  
三、程序代码 *#1J  
/z )Nz2W  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL k3T374t1b  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) D,()e^o  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ z<_a4 ffR  
#if _MSC_VER > 1000 ]QQeUxi  
#pragma once qFI19`?8E  
#endif // _MSC_VER > 1000 ;?v&=Z't.  
#ifndef __AFXWIN_H__ Hb[P|pPT  
#error include 'stdafx.h' before including this file for PCH }nptmc  
#endif ^mouWw)a_  
#include "resource.h" // main symbols aoBiN_  
class CHookApp : public CWinApp |-HNHUF  
{ KV! (   
 public: WtC&Qyuq  
  CHookApp(); z0UtKE^b  
  // Overrides *;F:6p4_  
  // ClassWizard generated virtual function overrides HP\5gLVXY  
  //{{AFX_VIRTUAL(CHookApp) 7~SnY\B|  
 public: iz0:  
  virtual BOOL InitInstance(); yG;@S8zC  
  virtual int ExitInstance(); \}!/z]u  
  //}}AFX_VIRTUAL agq4Zy  
  //{{AFX_MSG(CHookApp)  ijDXh y  
  // NOTE - the ClassWizard will add and remove member functions here. ^b4i9n,t1  
  // DO NOT EDIT what you see in these blocks of generated code ! bwa*|{R  
  //}}AFX_MSG Pj_*,L`mZ  
  DECLARE_MESSAGE_MAP() )iJv?Y\]  
}; xW7[VTXc^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); d5`D[,]d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `lrNH]B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cgO<%_l3`  
BOOL InitHotkey(); &Mz]y?k'  
BOOL UnInit(); 3"sXN)j  
#endif X]o"vx%C  
5~d=,;yE  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. F3t IJz>3  
#include "stdafx.h" 1vS-m x  
#include "hook.h" clk]JA (  
#include <windowsx.h> U\!9dhx  
#ifdef _DEBUG FNw]DJ]  
#define new DEBUG_NEW a}iP +#;  
#undef THIS_FILE ;%k C?Vzi  
static char THIS_FILE[] = __FILE__; TM|PwY  
#endif d%RH]j4  
#define MAX_KEY 100 R7KV @n  
#define CTRLBIT 0x04 6Kw?  
#define ALTBIT 0x02 skU }BUK6  
#define SHIFTBIT 0x01 aMVq%{U  
#pragma data_seg("shareddata") |9p0"#4u  
HHOOK hHook =NULL; %xKZ" #Z#K  
UINT nHookCount =0; c?KIHZ0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Xoha.6$l5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3E0C$v KM  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey p=^6V"'  
static int KeyCount =0; wEN[o18{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift KUpj.[5 qo  
#pragma data_seg() dk"@2%xJ2d  
HINSTANCE hins; T%;NW|mH&  
void VerifyWindow(); F)Z9Qlo  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,`YIcrya:  
//{{AFX_MSG_MAP(CHookApp) "d /uyS$6  
// NOTE - the ClassWizard will add and remove mapping macros here. LDYa{w-t  
// DO NOT EDIT what you see in these blocks of generated code! ; .b^&h  
//}}AFX_MSG_MAP nyxoa/  
END_MESSAGE_MAP() nrX+  '  
~)zxIO!  
CHookApp::CHookApp() ( uG; Q  
{ o,S(;6pDJ  
 // TODO: add construction code here, gVy`||z  
 // Place all significant initialization in InitInstance eKo=g|D  
} Z3=N= xY]  
6urU[t1  
CHookApp theApp; NjPQT9&3h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Rf2mBjJ(z  
{ 0cVxP)J+  
 BOOL bProcessed=FALSE; Se37-  
 if(HC_ACTION==nCode) yk(r R  
 {  Mz+vT0  
  if((lParam&0xc0000000)==0xc0000000){// Key up l?YO!$  
   switch(wParam) 7\ZSXQy1W  
   { u:6R|%1fNn  
    case VK_MENU: /k(wb4Hv  
     MaskBits&=~ALTBIT; Y9&na&vY?  
     break; $o9@ ?2  
    case VK_CONTROL: t OxH9  
     MaskBits&=~CTRLBIT; ~B? Wg!  
     break; Q04 `+Vr  
    case VK_SHIFT: N2Ysi$  
     MaskBits&=~SHIFTBIT; uBn35%  
     break; SLUQFoz}  
    default: //judge the key and send message GV28&!4sS  
     break; |sl^4'Ghc  
   } _ n1:v~  
   for(int index=0;index<MAX_KEY;index++){ da_0{;wR  
    if(hCallWnd[index]==NULL) z.?slYe[  
     continue; Plhakngj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) euW   
    { 1L!jI2~x}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n3qRt  
     bProcessed=TRUE; E7_OI7C  
    } qZ +K4H  
   } @`8a 3sL)  
  } B#35)QI  
  else if((lParam&0xc000ffff)==1){ //Key down Li$2 Gpc/  
   switch(wParam) !_;J@B  
   { 25j\p{*  
    case VK_MENU: 12_ 7UWZ"  
     MaskBits|=ALTBIT; q)KOI` A  
     break; H* +7{;$  
    case VK_CONTROL: eH[i<Z  
     MaskBits|=CTRLBIT; i}i >ho-8  
     break; ^U96p0H"T  
    case VK_SHIFT: N:S2X+}(  
     MaskBits|=SHIFTBIT; -P&uY`  
     break; U~t!   
    default: //judge the key and send message mZmEE2h  
     break; 0IA' 5)  
   } x; -D}#  
   for(int index=0;index<MAX_KEY;index++) pjFj{  
   { 81!;Wt(?  
    if(hCallWnd[index]==NULL) pG"h ZB3)  
     continue; 6A}tA$*s7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $J,$_O6  
    { :nc%:z=O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); o_[~{@RoR  
     bProcessed=TRUE; LnN:;h  
    } m\bmBK"I  
   } 7,V_5M;t  
  } U>m{B|H  
  if(!bProcessed){ -S&9"=v  
   for(int index=0;index<MAX_KEY;index++){ Q~k|lTf  
    if(hCallWnd[index]==NULL) 3d7A/7S  
     continue; *.+F]-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) a? PH`5O  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n<<arO"cv  
   } +aPe)U<t  
  } NYs<`6P:Y  
 } ]#rV]As  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~ b66 ;  
} 7!FiPH~kM  
FeQo,a  
BOOL InitHotkey() _Ii=3Qsf  
{ ,&Zk63V  
 if(hHook!=NULL){ 0+e 0<'  
  nHookCount++; 1h)K3cC  
  return TRUE; u{l4O1k/c  
 } Wm)Id_  
 else zP c54 >f  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Zl]@;*u  
  if(hHook!=NULL) }XCh>LvX  
   nHookCount++; \y7Gi}nI  
  return (hHook!=NULL); -`t9@1P> =  
} nmuU*o L  
BOOL UnInit() {q~N$"#  
{ 9}q)AL-ga  
 if(nHookCount>1){ 9p4SxMMO  
  nHookCount--; AF{@lDa1h  
  return TRUE; %[o($a$  
 } "tA.`*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); V*@&<x"E  
 if(unhooked==TRUE){ TA#pA(k  
  nHookCount=0; dLR[<@E  
  hHook=NULL; B.gEV*@  
 } Yb:F,d-Ya  
 return unhooked; D>-Pv-f/  
} byZj7q5&Q  
GQE7P()  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AD6 b  
{ =">0\#  
 BOOL bAdded=FALSE; `+UBl\j  
 for(int index=0;index<MAX_KEY;index++){ 7Q&S [])  
  if(hCallWnd[index]==0){ N Zwi3  
   hCallWnd[index]=hWnd; /6 y;fx  
   HotKey[index]=cKey; P(L iH  
   HotKeyMask[index]=cMask; ykGA.wo7/P  
   bAdded=TRUE; Scmew  
   KeyCount++; aq(i^d  
   break; UyDq`@h  
  } 91k-os(4]  
 } @?t+O'&  
 return bAdded; nD=N MqQ &  
} $ ]^Io)}f@  
?U2 'L2y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pE.TG4  
{ ;g<y{o"Q3p  
 BOOL bRemoved=FALSE; vOtILL6  
 for(int index=0;index<MAX_KEY;index++){ x3nUKQtk:8  
  if(hCallWnd[index]==hWnd){ /In=u6D O  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UGoB7TEfn  
    hCallWnd[index]=NULL; ?rdWhF]  
    HotKey[index]=0; T?7++mcA  
    HotKeyMask[index]=0; 5`::#[  
    bRemoved=TRUE; Z07n>|WF-  
    KeyCount--; jk%H+<FU`  
    break; 2=naPTP(  
   } X*&Thmee  
  } )6px5Vwz  
 } WkPT6d  
 return bRemoved; J!@R0U.  
} V&lx0Dy  
NA#,q 8  
void VerifyWindow() n6C!5zq7U  
{ qGP}  
 for(int i=0;i<MAX_KEY;i++){ =pnQ?2Og  
  if(hCallWnd!=NULL){ LQ||7>{eX  
   if(!IsWindow(hCallWnd)){ '7.4!I0'  
    hCallWnd=NULL; Z!l]v.S  
    HotKey=0; !y$+RA7\  
    HotKeyMask=0; ,!P}Y[|  
    KeyCount--; U/h@Q\~U  
   } cPg{k}9Tvy  
  } CKC5S^Mx  
 } bE3mOml  
} 9H+Q/Q*-a  
vr_Z0]4`C9  
BOOL CHookApp::InitInstance() g3(LDqB'.  
{ y-"QY[  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (N`GvB7;  
 hins=AfxGetInstanceHandle(); 8wn{W_5a  
 InitHotkey(); F]s:`4  
 return CWinApp::InitInstance();  EIPXq  
} <@Y`RqV+  
Xc L%0%`  
int CHookApp::ExitInstance() 4EaxU !BT  
{ Q2* ~9QkU  
 VerifyWindow(); #WAX&<m  
 UnInit(); bo@, B  
 return CWinApp::ExitInstance(); 4`") aM  
} fm q(!  
A>_,tt  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0!tuUn  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) h,,B"vPS  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -x|!?u5F  
#if _MSC_VER > 1000 be?Bf^O>  
#pragma once jWdZ ]0m  
#endif // _MSC_VER > 1000 flOXV   
(/X ]9  
class CCaptureDlg : public CDialog zU_ dk'&,  
{ dEW= V"W  
 // Construction %.HLO.A  
 public: Sf@xP.d  
  BOOL bTray; zMd><UQP{  
  BOOL bRegistered; F_4Et  
  BOOL RegisterHotkey(); l+X\>,  
  UCHAR cKey;  2IGU{&s  
  UCHAR cMask; ]bYmM@  
  void DeleteIcon(); po.QM/b \  
  void AddIcon(); U]g9t<jD  
  UINT nCount; |I{3~+E h  
  void SaveBmp(); 0|8cSE< i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ln8es{q  
  // Dialog Data @Bn4ZF B@  
  //{{AFX_DATA(CCaptureDlg) ^66OzT8A  
  enum { IDD = IDD_CAPTURE_DIALOG }; G\^<MR|  
  CComboBox m_Key; [70 5[  
  BOOL m_bControl; &>QxL d#  
  BOOL m_bAlt; zS h9`F  
  BOOL m_bShift; #rNc+  
  CString m_Path; yB 'C9wEH  
  CString m_Number; qk(bA/+e  
  //}}AFX_DATA 'yV*eG?^&  
  // ClassWizard generated virtual function overrides JAT%s %UC  
  //{{AFX_VIRTUAL(CCaptureDlg) q- 0q:  
 public: #&1gVkvp  
  virtual BOOL PreTranslateMessage(MSG* pMsg); bm4Bq>*=U  
 protected: %~,Fe7#p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IM5[O}aq  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); I5`>XfO)  
  //}}AFX_VIRTUAL CF@*ki3X  
  // Implementation L4bYVTm|  
 protected: V`HnFAW  
  HICON m_hIcon; B<n[yiJ}  
  // Generated message map functions !nlr!+(fV  
  //{{AFX_MSG(CCaptureDlg) 4^ U%` 1  
  virtual BOOL OnInitDialog(); =6'bGC%c  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); rBy0hGx  
  afx_msg void OnPaint(); .w'b%M  
  afx_msg HCURSOR OnQueryDragIcon(); 0,Ib74N'w  
  virtual void OnCancel(); MUGoW;}v )  
  afx_msg void OnAbout(); 2)T;N`tNw  
  afx_msg void OnBrowse(); =1'WZp}D5  
  afx_msg void OnChange(); .D\oKhV(  
 //}}AFX_MSG yPs6_Qo!p  
 DECLARE_MESSAGE_MAP() YMU""/(  
}; *<6dB#' J  
#endif "?lz[K>  
z( }w|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lNtxM"G&  
#include "stdafx.h" r/"^{0;F{W  
#include "Capture.h" Q"GM3?  
#include "CaptureDlg.h" AO|1m$xf  
#include <windowsx.h> MNb9~kM  
#pragma comment(lib,"hook.lib") xXa4t4gR  
#ifdef _DEBUG V0W4M%  
#define new DEBUG_NEW .kMnq8u  
#undef THIS_FILE mH4u@aQ}  
static char THIS_FILE[] = __FILE__; `'k2gq&  
#endif 9=}[~V n  
#define IDM_SHELL WM_USER+1 CQ^(/B^c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0a#v}w^ *  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2N]8@a  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; z@pa;_  
class CAboutDlg : public CDialog /!A"[Tyt  
{ "PO8Q  
 public: yXv@yn  
  CAboutDlg(); ^cSfkBh  
  // Dialog Data }Nwp{["}]L  
  //{{AFX_DATA(CAboutDlg) F]r'j ZL  
  enum { IDD = IDD_ABOUTBOX }; +G[zE  
  //}}AFX_DATA +`>E_+Mp  
  // ClassWizard generated virtual function overrides 3 H5  
  //{{AFX_VIRTUAL(CAboutDlg) ksuePMIK  
 protected: A9u>bWIE7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support SK^(7Ws~0  
  //}}AFX_VIRTUAL sP eTW*HeR  
  // Implementation ?A_+G 5  
 protected: y 5=r r3%v  
  //{{AFX_MSG(CAboutDlg) ls!A'@J  
  //}}AFX_MSG b=pk;'-  
  DECLARE_MESSAGE_MAP() Kg"eS`-  
}; "kBVHy  
VKX|0~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >A6W^J|[  
{ U`HY eJ  
 //{{AFX_DATA_INIT(CAboutDlg) /F~/&p1<\k  
 //}}AFX_DATA_INIT 92A9gY  
} qQG? k~r  
US"g>WLwJ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) a%si:_  
{ `XK\', }F  
 CDialog::DoDataExchange(pDX); CMOyK^(e  
 //{{AFX_DATA_MAP(CAboutDlg) ha=2isq  
 //}}AFX_DATA_MAP t&q~ya/C  
} 9X;*GC;d  
X#JUorGp  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $,U/,XA {E  
 //{{AFX_MSG_MAP(CAboutDlg) GN! R<9  
 // No message handlers $L6R,%c  
 //}}AFX_MSG_MAP %X %zK1  
END_MESSAGE_MAP() n5.sx|bI?  
~M} K]Li  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ,zHL8SiTX  
: CDialog(CCaptureDlg::IDD, pParent) Rk#'^ }  
{ Uuu2wz3O0  
 //{{AFX_DATA_INIT(CCaptureDlg) x< 2]UB`  
  m_bControl = FALSE; QkD ~  
  m_bAlt = FALSE; g@4~,  
  m_bShift = FALSE; 3x+=7Mg9  
  m_Path = _T("c:\\"); m[3c,Axl7  
  m_Number = _T("0 picture captured."); 9wldd*r  
  nCount=0; LDHu10l  
  bRegistered=FALSE; u^{p' a'  
  bTray=FALSE; l/zv >  
 //}}AFX_DATA_INIT rM A%By^L-  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 W&|?8%"l]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); tJ>>cFx  
} _",(!(  
q@[F|EF=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6?<lS.s  
{ *Ic^9njt  
 CDialog::DoDataExchange(pDX); xi "3NF%=  
 //{{AFX_DATA_MAP(CCaptureDlg) YF-E1`+?<  
  DDX_Control(pDX, IDC_KEY, m_Key); : q%1Vi  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &DGz/o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); C{uT1`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); a?r$E.W'&  
  DDX_Text(pDX, IDC_PATH, m_Path); xlwf @XW  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qwj7CIc(  
 //}}AFX_DATA_MAP (P-^ PNz&  
} 7:uz{xPK6  
^?""'1iuQx  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ez[x8M>  
//{{AFX_MSG_MAP(CCaptureDlg) DAWF =p]  
 ON_WM_SYSCOMMAND() sZ&|omN  
 ON_WM_PAINT() B47I?~{  
 ON_WM_QUERYDRAGICON() wW\@^5  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [5p9p1@u{C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) *.>@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) a"U3h[;$y  
//}}AFX_MSG_MAP |w*s:p  
END_MESSAGE_MAP() zM&ro,W  
OH2IO  
BOOL CCaptureDlg::OnInitDialog() =&UE67eK,  
{ Q2m[XcnX  
 CDialog::OnInitDialog(); k $gcQ:|  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >_yL@^  
 ASSERT(IDM_ABOUTBOX < 0xF000); aQx6;PC  
 CMenu* pSysMenu = GetSystemMenu(FALSE); |U{~t<BF#  
 if (pSysMenu != NULL) K a(B&.  
 { %+j/nA1%S  
  CString strAboutMenu; [}HPV+j=U  
  strAboutMenu.LoadString(IDS_ABOUTBOX); SEzjc ~@3  
  if (!strAboutMenu.IsEmpty()) `Ze$Bd\  
  { 8el6z2  
   pSysMenu->AppendMenu(MF_SEPARATOR); gtMR/P:S  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); IW<rmP=R&  
  } RNB&!NC  
 } @PNgqjd  
 SetIcon(m_hIcon, TRUE); // Set big icon i&6U5Va,G  
 SetIcon(m_hIcon, FALSE); // Set small icon #!O)-dyF  
 m_Key.SetCurSel(0); :~8@fEKb{  
 RegisterHotkey(); S5>ztK.e  
 CMenu* pMenu=GetSystemMenu(FALSE); >^g2 Tg:  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Y3[KS;_fr9  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ss 5@n  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nn:'<6"oV  
 return TRUE; // return TRUE unless you set the focus to a control >fP;H}S6  
} m\jjj^f a  
au50%sA~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Xv!Gg6v6  
{ M("sekL  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) FNLS=4  
 { xP_%d,  
  CAboutDlg dlgAbout; sNpA!!\PM  
  dlgAbout.DoModal(); JGvhw,g  
 } Iv  
 else c$ib-  
 { |^5"-3Q  
  CDialog::OnSysCommand(nID, lParam); "0PsCr}!  
 } hL/u5h%$  
} s&V sK#  
; ,sNRES3  
void CCaptureDlg::OnPaint() /YZMP'v  
{ u4 es8"  
 if (IsIconic()) O(%6/r`L,k  
 { }Em{?Hqy  
  CPaintDC dc(this); // device context for painting )ddJ\:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ]\|2=  
  // Center icon in client rectangle Z|*#)<| ~  
  int cxIcon = GetSystemMetrics(SM_CXICON); b6k_u9m^E  
  int cyIcon = GetSystemMetrics(SM_CYICON); Vv(buG  
  CRect rect; :X}SuM ?c  
  GetClientRect(&rect); ? Pi|`W   
  int x = (rect.Width() - cxIcon + 1) / 2; /# Jvt  
  int y = (rect.Height() - cyIcon + 1) / 2; ,h1\PT9ULY  
  // Draw the icon U'F}k0h?\'  
  dc.DrawIcon(x, y, m_hIcon); &'k(v(>n,  
 } j$_?g!I=gK  
 else EmO[-W|2  
 { dDl+  
  CDialog::OnPaint(); R2~y<^.V`Y  
 } %>+lr%B  
} v4Ag~Evcx  
V#$QKn`;  
HCURSOR CCaptureDlg::OnQueryDragIcon() H?;+C/-K`_  
{ 53aJnxX  
 return (HCURSOR) m_hIcon; ws`r\k]3J  
} -6-rX D  
rG~W=!bj  
void CCaptureDlg::OnCancel() jEQ_#KKYJ  
{ Ih5Y7<8b~  
 if(bTray) %K3U`6kHcd  
  DeleteIcon(); ` ~m/  
  CDialog::OnCancel(); z6M5 '$\y  
} 6<\dQ+~  
->51t  
void CCaptureDlg::OnAbout() 'q;MhnU+  
{ Z ;~%!  
 CAboutDlg dlg; {~51h}>b#  
 dlg.DoModal(); Q?j '4  
} Ygg+=@].@  
']2d^'TH  
void CCaptureDlg::OnBrowse() fFbJE]jW  
{ Q`J U[nY  
 CString str; -tWxB GSa@  
 BROWSEINFO bi; YY tVp_)  
 char name[MAX_PATH]; 9(HGe+R4o  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1S(oi  
 bi.hwndOwner=GetSafeHwnd(); # {k$Fk  
 bi.pszDisplayName=name; Z-CA9&4Uh  
 bi.lpszTitle="Select folder"; 6v:L8 t$"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )ZLj2H<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;9)nG,P3  
 if(idl==NULL) d=+zOF  
  return; g8Y)90 G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2<0".5+I  
 str.ReleaseBuffer(); KMb'm+  
 m_Path=str; >(n /  
 if(str.GetAt(str.GetLength()-1)!='\\') .XK3o .ZhW  
  m_Path+="\\"; V3*@n*"N;  
 UpdateData(FALSE); k "7,-0gz  
} 7!`1K_v6  
0 nI*9  
void CCaptureDlg::SaveBmp() UjunIKX+  
{ f9_Pn'"I  
 CDC dc; e]!`94f  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Wn;%B].I  
 CBitmap bm; 7w5l[a/  
 int Width=GetSystemMetrics(SM_CXSCREEN); h8M}}   
 int Height=GetSystemMetrics(SM_CYSCREEN); E<B/5g!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &u"mFweS  
 CDC tdc; Gz\wmH&rVz  
 tdc.CreateCompatibleDC(&dc); h }&dvd  
 CBitmap*pOld=tdc.SelectObject(&bm); ~9!@BL\  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); P&c O2  
 tdc.SelectObject(pOld); :& $v.#  
 BITMAP btm; Y~( 8<`^  
 bm.GetBitmap(&btm); j}@LiH'Q  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Qd3ppJn  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FDBNKQV  
 BITMAPINFOHEADER bih; ]B&jMj~y&  
 bih.biBitCount=btm.bmBitsPixel; `tHF}  
 bih.biClrImportant=0; `7`` 1TL  
 bih.biClrUsed=0; _,Q -)\  
 bih.biCompression=0; I L&PN`#  
 bih.biHeight=btm.bmHeight; 5D^2 +`$/  
 bih.biPlanes=1; HuA4eJ(2  
 bih.biSize=sizeof(BITMAPINFOHEADER); '|tmmoY6a:  
 bih.biSizeImage=size; E7SmiD@)  
 bih.biWidth=btm.bmWidth; c2gZ<[~  
 bih.biXPelsPerMeter=0; V+})$m*>  
 bih.biYPelsPerMeter=0; @O6 2} F  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [e|9%[.V  
 static int filecount=0; 6lr<{k7Nw  
 CString name; s/;S2l$`  
 name.Format("pict%04d.bmp",filecount++); M6Ik'r"M  
 name=m_Path+name; 'vZWk eo  
 BITMAPFILEHEADER bfh; aNICSxDN  
 bfh.bfReserved1=bfh.bfReserved2=0; ZS&+<kGD  
 bfh.bfType=((WORD)('M'<< 8)|'B'); se_Oi$VZ{  
 bfh.bfSize=54+size; |hvclEu,  
 bfh.bfOffBits=54; ncR]@8  
 CFile bf; ob)c0Pz  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ e/)Vx'd`+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); &6\E'bBt  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zb!RfQ,  
  bf.WriteHuge(lpData,size); r/+~4W5  
  bf.Close(); 1q*=4O  
  nCount++; m$'ZiS5  
 } 5cr\ JR  
 GlobalFreePtr(lpData); Jjx1`S*i  
 if(nCount==1) py/#h$eY  
  m_Number.Format("%d picture captured.",nCount); *@ S+J$  
 else 6I5LZ^/G9  
  m_Number.Format("%d pictures captured.",nCount); Z7MGBwP(  
  UpdateData(FALSE); `q y@Qo  
} S]c&T`jx  
) @f6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V$  MMK  
{  (=Lx9-u  
 if(pMsg -> message == WM_KEYDOWN) ?[X^'zz}  
 { thh0~g0/  
  if(pMsg -> wParam == VK_ESCAPE) W_]onq 6  
   return TRUE; )f`oCXh  
  if(pMsg -> wParam == VK_RETURN) |198A,^  
   return TRUE; 0ol*!@?  
 } a7fn{VU8  
 return CDialog::PreTranslateMessage(pMsg); HAcC& s8  
} u5P2*  
M+M\3U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7Y1FFw |  
{ HUGhz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ E*UE?4FSw|  
  SaveBmp(); +78cQqDY!  
  return FALSE; 6PRP&|.#  
} CGZ3-OW@E  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Y$eO:67;  
 CMenu pop; )#025>$z  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); G9 ra;.  
 CMenu*pMenu=pop.GetSubMenu(0); pb|,rLNZ  
 pMenu->SetDefaultItem(ID_EXITICON); Ob h@d|  
 CPoint pt; 3m/XT"D  
 GetCursorPos(&pt); &jE@i#  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); n4Q ^   
 if(id==ID_EXITICON) GsNZr=;C  
  DeleteIcon(); Uizg.<.  
 else if(id==ID_EXIT) qbD[<T  
  OnCancel(); I73=PfS:m  
 return FALSE;  D ~t  
} _G ^Cc}X  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7SJtW`~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sk~inIj-  
 AddIcon(); DYW&6+%,hO  
 return res; mW 'sdb  
} y3@5~4+  
)s>R~7  
void CCaptureDlg::AddIcon() Pbl#ieZM  
{ PI$K+}E  
 NOTIFYICONDATA data; g3vR\?c`  
 data.cbSize=sizeof(NOTIFYICONDATA); }9 I,p$  
 CString tip; *w23(f  
 tip.LoadString(IDS_ICONTIP); 18G=j@k7  
 data.hIcon=GetIcon(0); %HcCe[d5l  
 data.hWnd=GetSafeHwnd(); <,Pk  
 strcpy(data.szTip,tip); k[5:]5lp+  
 data.uCallbackMessage=IDM_SHELL; YaAOP'p  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FZ=xy[q]~  
 data.uID=98; )i$KrN6  
 Shell_NotifyIcon(NIM_ADD,&data); $'93:9tg  
 ShowWindow(SW_HIDE); tk!5"`9N  
 bTray=TRUE; x^)W}p"  
} U'0e<IcY  
7&vDx=W  
void CCaptureDlg::DeleteIcon() O{ |Ug~  
{ #7p!xf^  
 NOTIFYICONDATA data; zx;~sUR;  
 data.cbSize=sizeof(NOTIFYICONDATA); j},3@TFh  
 data.hWnd=GetSafeHwnd(); lHc9D  
 data.uID=98; b r\_  
 Shell_NotifyIcon(NIM_DELETE,&data); cng166}1A  
 ShowWindow(SW_SHOW); WM9z~z'2a  
 SetForegroundWindow(); X \qG WpN%  
 ShowWindow(SW_SHOWNORMAL); J1@skj4#\~  
 bTray=FALSE; 9G^gI}bY  
} yVgHu#?PM  
40HhMTZ0-  
void CCaptureDlg::OnChange() lYhC2f m_  
{ r>B|JPm  
 RegisterHotkey(); Nf)$K'/  
} ayQ2#9X}  
U[W &D%'  
BOOL CCaptureDlg::RegisterHotkey() % !Ih=DZ  
{ 9E}JtLgT  
 UpdateData(); 1\-r5e; BE  
 UCHAR mask=0; L"}tJM.d  
 UCHAR key=0; IO<Ds#(  
 if(m_bControl) K>G.HN@  
  mask|=4; w$"^)E G,7  
 if(m_bAlt) }/M muPp  
  mask|=2; moL3GV%]Gq  
 if(m_bShift) iAZbh"I  
  mask|=1; >35W{ d  
  key=Key_Table[m_Key.GetCurSel()]; <."KejXg-  
 if(bRegistered){ P~s u]+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); l"/E,X  
  bRegistered=FALSE; b*1yvkX5  
 } J;'H],w}f  
 cMask=mask; jcHyRR1R  
 cKey=key; ox5WboL  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); L}rYh`bUP[  
 return bRegistered; z `jLKPP!=  
} /[E2+g  
iP6?[pl8  
  四、小结 aNP\Q23D  
l2ie\4dK@  
  本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。
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