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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: j4RM'_*G  
  d4<Ic#  
  一、实现方法 gn"_()8cT  
S?*pCJ0  
  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: E8#r<=(m  
fdP[{.$?(  
#pragma data_seg("shareddata") YO o?.[}@  
HHOOK hHook =NULL; //钩子句柄 w. exLC  
UINT nHookCount =0; //挂接的程序数目 P<yd  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ^50#R< Ny  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 XmN3[j  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey J/Ki]T9  
static int KeyCount =0; d54(6N%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 4h wUH  
#pragma data_seg() n| =k9z<y8  
JK0L&t<  
  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。 {#YGor|  
$>zLa_cn|  
  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: VKRj 1LXz  
>i=^Mh-bm  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR oyV@BHJO@  
cKey,UCHAR cMask) +` g&J  
{ Z7?C^m  
 BOOL bAdded=FALSE; 7Wub@Mp  
 for(int index=0;index<MAX_KEY;index++){ 6( TG/J  
  if(hCallWnd[index]==0){ 7KU/ 1l9$9  
   hCallWnd[index]=hWnd; b489sa  
   HotKey[index]=cKey; QZ(se  
   HotKeyMask[index]=cMask; X?5M)MP+I  
   bAdded=TRUE; 1MV\Jm  
   KeyCount++; ilL] pU-  
   break; 1L.H"  
  } @A6 P[r  
 } %9hzz5#  
 return bAdded; J2VhheL`J  
} PK^{WF}L;  
//删除热键 ^Z]1Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dE9xan  
{ N9IBw',  
 BOOL bRemoved=FALSE; WF#eqU*&  
 for(int index=0;index<MAX_KEY;index++){ FaO=<jYi  
  if(hCallWnd[index]==hWnd){ HVG9 C$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M rpn^C2)  
    hCallWnd[index]=NULL; T1yJp$yD"  
    HotKey[index]=0; Z!o&};_j  
    HotKeyMask[index]=0; \9*wo9cV  
    bRemoved=TRUE; \A'MEd-  
    KeyCount--; X,d`-aKO\y  
    break; xFcJyjo^z  
   } vB >7W  
  } ek6PMZF:'  
 } 8*y hx  
 return bRemoved; yZFm<_9>  
} [U[saR\  
#x Z7%    
'ms&ty*T  
  DLL中的钩子函数如下: LO{{3No  
w7}m T3p,)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) "F%w{bf  
{ ta\AiHm  
 BOOL bProcessed=FALSE; @#[<5ld  
 if(HC_ACTION==nCode) tpp. 9  
 { =9@{U2 =l  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 3n-~+2l  
   switch(wParam) 9fR`un)f}  
   {  y\7 -!  
    case VK_MENU: vL~nJv  
     MaskBits&=~ALTBIT; Yg@k +  
     break; "e<Z$"7i  
    case VK_CONTROL: J*s!(J |Q  
     MaskBits&=~CTRLBIT; j8kax/*[  
     break; MzLnD D^  
    case VK_SHIFT: W ]cJP  
     MaskBits&=~SHIFTBIT; A}KRXkB  
     break; e\%emp->  
    default: //judge the key and send message |#^##^cF/  
     break; gB1w,96J  
   } H(bR@Qok  
   for(int index=0;index<MAX_KEY;index++){ ab4(?-'-  
    if(hCallWnd[index]==NULL) L h"K"Uv  
     continue; YI!ecx%/4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) & yFS  
    {  meQ>mW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); E _d^&{j  
     bProcessed=TRUE; MU2ufKq4)  
    } 8,Iil:w  
   } tVJ}NI #  
  } D0Cs g39  
  else if((lParam&0xc000ffff)==1){ //有键按下 2 t'^  
   switch(wParam) 3dm lP2  
   { ;`<uo$R  
    case VK_MENU: ir^%9amh  
     MaskBits|=ALTBIT; Dj!v+<b  
     break; LlAMtw"  
    case VK_CONTROL: !qe ,&JL  
     MaskBits|=CTRLBIT; !.>TF+]  
     break; Q _Yl:c  
    case VK_SHIFT: LPr34BK  
     MaskBits|=SHIFTBIT; X1Vx 6+[  
     break; \%Wu`SlDp9  
    default: //judge the key and send message 5&V0(LT]C  
     break; p^1s9CM%  
   } (3kz(6S  
   for(int index=0;index<MAX_KEY;index++){ 3(D!]ku~m  
    if(hCallWnd[index]==NULL) KG:CVIW Y  
     continue; rXR=fj= 2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WN8XiV  
    { ,m<t/@^]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); yhF{ cK =  
     bProcessed=TRUE; yu8xTh$:  
    } k@QU<cvI  
   } V 2-fJ!  
  } _?]E)i'RI  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 w7d(|`  
   for(int index=0;index<MAX_KEY;index++){ CMk0(sztU_  
    if(hCallWnd[index]==NULL) Y"J' 'K  
     continue;   -58  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Wp!#OY1?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xD[O8vQE  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 [k)xn3[  
   } $-4OveS~B  
  } v5J% p4  
 } C>\0 "}iD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h>>KH*dQ  
} ""-#b^DQ  
(.6~t<DRv  
  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: 8}9B*m  
?"oW1a\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;2lKo="  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'F3cvpc`  
mI5BJ  
  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: QU0FeGtz  
]&l.-0jt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J=QuZwt  
{ fB .xjp?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~zdHJ8tYp  
 { Rw8l"`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9='a9\((mH  
  SaveBmp(); a:$hK%^ \  
  return FALSE; FdrH,  
 } d1MY>zq  
 …… //其它处理及默认处理 Z/#l~.o[  
} )a:j_jy  
$#|iKi<Y@j  
R+}x#  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 \^=Wp'5R  
or2BG&W  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 rl#[HbPM  
3=r#=u5z  
  二、编程步骤 4dv5  
k 4|*t}o7  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; G's >0  
SRL`!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; sfLH[Q?  
0#K?SuY.eN  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ;%u'w;sgq  
+C`h*%BW  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; y_aKW4L+  
gWlv;oq  
  5、 添加代码,编译运行程序。 NI(fJ%U  
uK_Q l\d  
三、程序代码 aI8k:FK"  
ssdpwn'  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL JY$B%R4;]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) rU^?Z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Yc5{M*w  
#if _MSC_VER > 1000 l5?fF6#j  
#pragma once ;=.i+  
#endif // _MSC_VER > 1000 J$Huzs#  
#ifndef __AFXWIN_H__ pVuJ4+`  
#error include 'stdafx.h' before including this file for PCH TRB)cJZ?  
#endif if|j)h&  
#include "resource.h" // main symbols KC@F"/h`/  
class CHookApp : public CWinApp aD5jy  
{ ",U>;`  
 public: Y\CR*om!W  
  CHookApp(); _,S L;*G4|  
  // Overrides T(< [k:`  
  // ClassWizard generated virtual function overrides 8#NI`s*  
  //{{AFX_VIRTUAL(CHookApp) P<Wtv;Z1Z  
 public: g[Tl#X7F  
  virtual BOOL InitInstance(); sY @S  
  virtual int ExitInstance(); \\<waU''  
  //}}AFX_VIRTUAL `jl 1Q,~2r  
  //{{AFX_MSG(CHookApp) cQ:Y@f 9  
  // NOTE - the ClassWizard will add and remove member functions here. 'A#`,^]uLF  
  // DO NOT EDIT what you see in these blocks of generated code ! -c%K_2`  
  //}}AFX_MSG PQ}q5?N  
  DECLARE_MESSAGE_MAP() RPb/U8  
}; Vfm (K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1h.Ypz u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ho 5mH{"OV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `R}q&|o7<  
BOOL InitHotkey(); axf4N@  
BOOL UnInit(); .=y-T=}  
#endif e1*<9&S  
o6{[7jI  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Mi|PhDXMh  
#include "stdafx.h" 'o%IA)sF  
#include "hook.h" [&IJy  
#include <windowsx.h>  bnll-G|  
#ifdef _DEBUG '|v??`o#  
#define new DEBUG_NEW IU f1N+-z  
#undef THIS_FILE <2{CR0]u  
static char THIS_FILE[] = __FILE__; O\=U'6 @  
#endif pn},ovR;  
#define MAX_KEY 100 "O`{QVg:  
#define CTRLBIT 0x04 AsBep  
#define ALTBIT 0x02 *rs@6BSj  
#define SHIFTBIT 0x01 y.KFz9Qv  
#pragma data_seg("shareddata") nEtG(^N  
HHOOK hHook =NULL; PS*=MyNa  
UINT nHookCount =0; fn6;  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 7/p&]0w  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT T]&% KQ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~;m3i3D  
static int KeyCount =0; ^TC<_]7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -ahSFBZlg  
#pragma data_seg() 3['aK|qk.  
HINSTANCE hins;  y">_$  
void VerifyWindow(); FiN^}Kh  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %t*_Rtz\o  
//{{AFX_MSG_MAP(CHookApp) L|O'X4"&_  
// NOTE - the ClassWizard will add and remove mapping macros here. %/b3G*$W  
// DO NOT EDIT what you see in these blocks of generated code! $d<vPpJ3  
//}}AFX_MSG_MAP Ek0zFnb[Gx  
END_MESSAGE_MAP() QKj8~l(  
b4l=Bg"  
CHookApp::CHookApp() SGuR-$U`)  
{ D..dGh.MY  
 // TODO: add construction code here, '\v mm>  
 // Place all significant initialization in InitInstance fjc8@S5x9j  
} z_)`='&n  
jm|x=s3}h  
CHookApp theApp; --(e(tvf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) RnvPqNs  
{ oCl $ 0x  
 BOOL bProcessed=FALSE; QkEIV<T&)l  
 if(HC_ACTION==nCode) z#$>f*b  
 { PL+j;V(<  
  if((lParam&0xc0000000)==0xc0000000){// Key up r2KfZ>tWg"  
   switch(wParam) -vRZCIj!  
   { x.=Np\#\G-  
    case VK_MENU: `s0`kp  
     MaskBits&=~ALTBIT; jFa{h!  
     break; '<Nhq_u{  
    case VK_CONTROL: TFIP>$*_C  
     MaskBits&=~CTRLBIT; yvPcD5s5  
     break; 4 _*^~w  
    case VK_SHIFT: !B&OK&*  
     MaskBits&=~SHIFTBIT; |4=Du-e  
     break; h92'~X36  
    default: //judge the key and send message ;IN!H@bq  
     break; *]L(,_:"  
   } )# ^5$5  
   for(int index=0;index<MAX_KEY;index++){ !=C74$TH  
    if(hCallWnd[index]==NULL) 3#=%2\  
     continue; wt8?@lJ"/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f!3$xu5  
    { ]Wc:9Zb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xJ2DkZ  
     bProcessed=TRUE; +#|| w9p  
    }  j-H2h  
   } a&'!g)d  
  } q<5AB{Oj?  
  else if((lParam&0xc000ffff)==1){ //Key down nnv&~C  
   switch(wParam) k9V#=,K0  
   { K,ccM[hu|  
    case VK_MENU: 8'niew 5d  
     MaskBits|=ALTBIT; Ia> 07av  
     break; b7thu5  
    case VK_CONTROL: |OgtAI9  
     MaskBits|=CTRLBIT; >I9w|z FA  
     break; *,hg+?lZ  
    case VK_SHIFT: 4,nUCT  
     MaskBits|=SHIFTBIT; (%bqeI!ob  
     break; )D_\~n/5  
    default: //judge the key and send message 5:oteNc3  
     break; cph&\ V2jt  
   } +,"O#`sy<  
   for(int index=0;index<MAX_KEY;index++) S:.Vt&+NJ  
   { <)f1skJsP  
    if(hCallWnd[index]==NULL) - &AgjzN!  
     continue; 12D>~#J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ys+2/>!  
    { u$vA9g4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4[& L<D6h  
     bProcessed=TRUE; m %=] j<A  
    } vpnOc2 -  
   } +>w %j&B  
  } '@jP$6T&  
  if(!bProcessed){ D-v}@tS'  
   for(int index=0;index<MAX_KEY;index++){ M, uQ8SZA[  
    if(hCallWnd[index]==NULL) v;%>F)I  
     continue; d*M:P jG@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C(4r>TNm  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); /t4#-vz  
   } T@Q,1^?i  
  } vs*Q {  
 } ##_`)/t,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 1N3qMm^  
} ^V5VRGq  
JemB[  
BOOL InitHotkey() Te\i;7;4u  
{ pGwBhZnb>  
 if(hHook!=NULL){ /=+y[y3`  
  nHookCount++; 53g(:eB  
  return TRUE; ` oPUf!  
 } vv  F:  
 else d=*&=r0!C{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O/N Ed)H!  
  if(hHook!=NULL) Q5kf-~Jx+  
   nHookCount++; >j%4U*  
  return (hHook!=NULL); [ST,/<?0  
} KF.d:  
BOOL UnInit() BEfP#h=hr  
{ L/39<&W  
 if(nHookCount>1){ 5s /fBS  
  nHookCount--; A9D vU)1  
  return TRUE; `A\|qH5`W  
 } h#e((j3-2Z  
 BOOL unhooked = UnhookWindowsHookEx(hHook); (^U 8wit/  
 if(unhooked==TRUE){ \DgWp:|  
  nHookCount=0; x_k @hGSC  
  hHook=NULL; Omkpjr(1  
 } aR c2#:~;  
 return unhooked; @hz~9AII9  
} /'g/yBY  
`P(Otr[6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 40M/Gu:  
{ $-J=UT2m  
 BOOL bAdded=FALSE; x2_?B[z  
 for(int index=0;index<MAX_KEY;index++){ 9pehQFfH  
  if(hCallWnd[index]==0){ IXz)xdP  
   hCallWnd[index]=hWnd; y%wjQC 0~  
   HotKey[index]=cKey; &_Vd  
   HotKeyMask[index]=cMask; Z1&<-T_  
   bAdded=TRUE; u/,ng&!  
   KeyCount++; 9 M<3m  
   break; _d J"2rx  
  } ;oT!\$Mu  
 } A4|L;z/A[h  
 return bAdded; H[;\[ 3  
} m })EYs1  
@D3|Ak1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) an<loL W  
{ $bho]~  
 BOOL bRemoved=FALSE; "m'roU  
 for(int index=0;index<MAX_KEY;index++){ q_G O;-b{  
  if(hCallWnd[index]==hWnd){ IXJ6w:E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8s@k0T<O  
    hCallWnd[index]=NULL; 5@3hb]J  
    HotKey[index]=0; ej^pFo  
    HotKeyMask[index]=0; '|jN!y^ 2p  
    bRemoved=TRUE; Y!0ZwwW  
    KeyCount--; k04CSzE"%  
    break; eGEeWJ}[$  
   } s2N~p^  
  } 1P '_EJ]M  
 } UbDRE[^P  
 return bRemoved; $HE ?B{  
} %1jlXa  
%aHQIoxg  
void VerifyWindow() ky^u.+cZ  
{ {CVn&|}J  
 for(int i=0;i<MAX_KEY;i++){ &1(PS)s  
  if(hCallWnd!=NULL){ E$?:^ausu  
   if(!IsWindow(hCallWnd)){ N Dg*8i  
    hCallWnd=NULL; aEJds}eE6)  
    HotKey=0; nUy2)CL[L  
    HotKeyMask=0;  0+P[0  
    KeyCount--; 7hLdCSX  
   } &.4m(ZX  
  } iAd3w6  
 } u@ psVt   
} s${|A =  
Scfk] DT  
BOOL CHookApp::InitInstance() 6Y 4I $[  
{ k >aWI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); S@WzvM  
 hins=AfxGetInstanceHandle(); x_eR/B>  
 InitHotkey(); 0.4Q-?J  
 return CWinApp::InitInstance(); ] 1:pnd  
} JPt0k  
x]X!nx6G  
int CHookApp::ExitInstance() {r.yoI4e  
{ 9[7Gxmf  
 VerifyWindow(); So^;5tG  
 UnInit(); l A1l  
 return CWinApp::ExitInstance(); `VzjXJw  
} ybNy"2Wk  
017(I:V?(:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =w#sCy  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uz8Y)b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ p0b2n a !  
#if _MSC_VER > 1000 no`>r}C  
#pragma once }@'Zt6+tS  
#endif // _MSC_VER > 1000 zK@DQ5  
s+jL BY  
class CCaptureDlg : public CDialog  Q&d"uLsx  
{ aIsT"6A~{  
 // Construction D) my@W0,  
 public: QaAWO  
  BOOL bTray; {;0+N -U  
  BOOL bRegistered; .V.x0  
  BOOL RegisterHotkey(); ?--EIA8mfp  
  UCHAR cKey; nsM :\t+ p  
  UCHAR cMask; %I 3D/!%  
  void DeleteIcon(); 41'|~3\X  
  void AddIcon(); ^<"^}Jh.M  
  UINT nCount; XFx p^  
  void SaveBmp(); l^,"^ vz  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor W.O]f.h  
  // Dialog Data fkjo  
  //{{AFX_DATA(CCaptureDlg) FLE2]cL-  
  enum { IDD = IDD_CAPTURE_DIALOG }; G$HXc$OY  
  CComboBox m_Key; Y8$,So>~  
  BOOL m_bControl; _,C>+dv)  
  BOOL m_bAlt; 0wlKBwf`J  
  BOOL m_bShift; c|,6(4j>$  
  CString m_Path; rgOc+[X  
  CString m_Number; [fjP.kw;J  
  //}}AFX_DATA mO1r~-~AJ  
  // ClassWizard generated virtual function overrides {;T7Kg.C  
  //{{AFX_VIRTUAL(CCaptureDlg) y~ZYI]` J  
 public: Z91GM1lrf8  
  virtual BOOL PreTranslateMessage(MSG* pMsg); +l8`oQuG  
 protected: HAtf/E]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JPq2C\Ka  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FO/ [7ZH  
  //}}AFX_VIRTUAL 8U$(9X  
  // Implementation ]g0h7q)79  
 protected: (aQNe{D#  
  HICON m_hIcon; },W<1*|  
  // Generated message map functions -ghmLMS%t  
  //{{AFX_MSG(CCaptureDlg) SJXA  
  virtual BOOL OnInitDialog(); w$2Z7S  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ET[vJnReC  
  afx_msg void OnPaint(); 8:=EA3  
  afx_msg HCURSOR OnQueryDragIcon(); hfBZ:es+  
  virtual void OnCancel(); NUvHY:  
  afx_msg void OnAbout(); f'>270pH  
  afx_msg void OnBrowse(); Pgp`g.$<  
  afx_msg void OnChange(); HLYTt)f}  
 //}}AFX_MSG [IgB78_$  
 DECLARE_MESSAGE_MAP() ^ rB7&96C,  
}; 2[; 4D/`*  
#endif GqT 0SP  
jLy3c@Dp  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4EZl (v"f`  
#include "stdafx.h" ^G~C#t^  
#include "Capture.h" F6$QEiDu@  
#include "CaptureDlg.h" A3Lfh6O  
#include <windowsx.h> jZ5 mpYUO  
#pragma comment(lib,"hook.lib") K\2UwX  
#ifdef _DEBUG ;:/<XfZ  
#define new DEBUG_NEW F ^mMyK  
#undef THIS_FILE * t-Wol  
static char THIS_FILE[] = __FILE__; 2 u{"R  
#endif UDUj  
#define IDM_SHELL WM_USER+1 wj$J} F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5jb/[i^V  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "iC*Eoz#.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j18qY4Gw)  
class CAboutDlg : public CDialog I5$@1+B  
{ r{Cbx#;  
 public: H1bPNt63  
  CAboutDlg(); @0 mR_\u\  
  // Dialog Data c2aW4 TX2  
  //{{AFX_DATA(CAboutDlg) .-[d6Pnw  
  enum { IDD = IDD_ABOUTBOX }; ha%3%O8Z  
  //}}AFX_DATA P0 va=H  
  // ClassWizard generated virtual function overrides +F9)+wT~;q  
  //{{AFX_VIRTUAL(CAboutDlg) V:wx@9m)  
 protected: Bn5O;I13  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \en}8r9cy  
  //}}AFX_VIRTUAL Cqy)+x_OQ,  
  // Implementation VX`E7Sf!}  
 protected: T,sArKBI  
  //{{AFX_MSG(CAboutDlg) A{3?G -]*  
  //}}AFX_MSG ju AUeGT  
  DECLARE_MESSAGE_MAP() _W3>Km-A=/  
}; -ST[!W V  
*u|bmt  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?<l,a!V'6  
{ z'(][SB  
 //{{AFX_DATA_INIT(CAboutDlg) %~`y82r6  
 //}}AFX_DATA_INIT >C1**GQ  
} zh<[ /'l  
eVVm"96Q.;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) xXJl Qbs  
{ PZDj)x_%B&  
 CDialog::DoDataExchange(pDX); S5W*,?  
 //{{AFX_DATA_MAP(CAboutDlg) /;[Zw8K7  
 //}}AFX_DATA_MAP 7E-1 #4  
} k70o=}  
Jp0*Y-*Y  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) giDe  
 //{{AFX_MSG_MAP(CAboutDlg) n&`=.[+A  
 // No message handlers SG)hrd  
 //}}AFX_MSG_MAP **%/Ke[  
END_MESSAGE_MAP() k6p Xc<]8  
vwlPFr Ll  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) dC F!.  
: CDialog(CCaptureDlg::IDD, pParent) BfcpB)N&.K  
{ _I&];WM\  
 //{{AFX_DATA_INIT(CCaptureDlg) w,<nH:~  
  m_bControl = FALSE; xux j  
  m_bAlt = FALSE;  bK7j"  
  m_bShift = FALSE; _9^  
  m_Path = _T("c:\\"); 3V,$FS]  
  m_Number = _T("0 picture captured."); 4}4K6y<q  
  nCount=0; h]DS$WZ  
  bRegistered=FALSE; 3%g\)Cs  
  bTray=FALSE; R43yr+p  
 //}}AFX_DATA_INIT K_fQFuj+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #K5)Rb-H  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }=+J&cR  
} ;Tn$c70  
+;H-0Q5  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) G<S(P@ss  
{ RoG `U  
 CDialog::DoDataExchange(pDX); '\&t3?;  
 //{{AFX_DATA_MAP(CCaptureDlg) Oc51|[ Wj  
  DDX_Control(pDX, IDC_KEY, m_Key); W[dK{?RB  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); y(#Aze{yC  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <vP{U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); g.& n X/  
  DDX_Text(pDX, IDC_PATH, m_Path); %LH~Im=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Spnshv8  
 //}}AFX_DATA_MAP Nan@SuKY  
} %`kO\q_  
7V^\fh5~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) E&}@P0^  
//{{AFX_MSG_MAP(CCaptureDlg) VSW:h  
 ON_WM_SYSCOMMAND() U X?EOrfJ  
 ON_WM_PAINT() ~w&_l57  
 ON_WM_QUERYDRAGICON() 8: x{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $rb #k{  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) KqM!7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0#gu7n|J  
//}}AFX_MSG_MAP DRo?7 _  
END_MESSAGE_MAP() "M)kV5v%  
HI` q!LPv  
BOOL CCaptureDlg::OnInitDialog() 3rF=u:r7c  
{ ifA)Ppt<`  
 CDialog::OnInitDialog(); th$?#4SbR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (iwZs:k-  
 ASSERT(IDM_ABOUTBOX < 0xF000); baD`k?](  
 CMenu* pSysMenu = GetSystemMenu(FALSE); l(o#N'!j4  
 if (pSysMenu != NULL) 7 )2Co[t  
 { _I"T(2Au  
  CString strAboutMenu; yo#aX^v~y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); rv75R}.6R^  
  if (!strAboutMenu.IsEmpty()) 6 J&_H(^  
  { ^""Ss  
   pSysMenu->AppendMenu(MF_SEPARATOR); r+4<Lon~  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); qmWK8}F.cE  
  } 6`ZHFem  
 } XZ8#8Di8  
 SetIcon(m_hIcon, TRUE); // Set big icon q;W(;B  
 SetIcon(m_hIcon, FALSE); // Set small icon w:|BQ,  
 m_Key.SetCurSel(0); lWVvAoe  
 RegisterHotkey(); +A 4};]W|  
 CMenu* pMenu=GetSystemMenu(FALSE); #- l1(m  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); W? `%it5  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z1-JoZ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); W^es"\  
 return TRUE; // return TRUE unless you set the focus to a control 5uVSbo.  
} 7K 8tz}  
"sM 3NY  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) R-L*N$@!  
{ ?89K [D|  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) TVkC pO,H  
 { sPu@t&$  
  CAboutDlg dlgAbout; 4iXB`@k  
  dlgAbout.DoModal(); R\^n2gK  
 } u%o2BLx  
 else 4RLuv?,)~  
 { TJ&Z/k3-  
  CDialog::OnSysCommand(nID, lParam); mbij& 0  
 } O|5Z-r0<  
} _P^ xX'v  
,#NH]T`c1  
void CCaptureDlg::OnPaint() C78V/{  
{ Y(qyuS3h~*  
 if (IsIconic()) 4axc05  
 { ceW,A`J  
  CPaintDC dc(this); // device context for painting F2B9Q_>P  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); g RX`61  
  // Center icon in client rectangle f  _ O  
  int cxIcon = GetSystemMetrics(SM_CXICON); *0*1.>Vg  
  int cyIcon = GetSystemMetrics(SM_CYICON); CDNh9`  
  CRect rect; "_g3{[es!  
  GetClientRect(&rect); 9d\B*OU  
  int x = (rect.Width() - cxIcon + 1) / 2; U2lDTRt  
  int y = (rect.Height() - cyIcon + 1) / 2; Vb _W&Nwd  
  // Draw the icon L.%N   
  dc.DrawIcon(x, y, m_hIcon); |#87|XIJ&~  
 } aUqVcEU1  
 else -naj.omG|  
 { 62}rZVJq  
  CDialog::OnPaint(); YH:murJMZ  
 } =;) M+"  
} ogOUrJ}P  
QSaJb?I  
HCURSOR CCaptureDlg::OnQueryDragIcon() `egyk)"aM  
{ K}r@O"6*\  
 return (HCURSOR) m_hIcon; |i}5vT78  
} _ ?\4k{ET  
O%>FKU>(?  
void CCaptureDlg::OnCancel() R*DQm  
{ 3U_,4qf  
 if(bTray) ,h#U<CnP#  
  DeleteIcon(); 7%%FYHMO:  
  CDialog::OnCancel(); "K!9^!4&  
} zFR=inI  
-C>q,mDJZ  
void CCaptureDlg::OnAbout() )\!-n]+A  
{ na%DF@Rt#  
 CAboutDlg dlg; T!iRg=<bz  
 dlg.DoModal(); NV[_XXTv7  
} ]tu:V,q  
o#X=1us  
void CCaptureDlg::OnBrowse() {m<NPtp910  
{ EYsf<8cl  
 CString str; Z7Y+rP[l  
 BROWSEINFO bi; W@T_-pTCjK  
 char name[MAX_PATH]; ThvVLK  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); e%B;8)7  
 bi.hwndOwner=GetSafeHwnd(); "F$0NYb]I  
 bi.pszDisplayName=name; WgV'T#*  
 bi.lpszTitle="Select folder"; ftw@nQNU  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; #?V7kds]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); T##_?=22I  
 if(idl==NULL) 09r0Rb  
  return; jOE~?{8m  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); `X=2Ff  
 str.ReleaseBuffer(); 5@:c6(5$  
 m_Path=str; 1z#0CX}Y/H  
 if(str.GetAt(str.GetLength()-1)!='\\') dV:vM9+x  
  m_Path+="\\"; f<Co&^A  
 UpdateData(FALSE); Uc?4!{$X  
} DNh{J^S"}w  
]Zj6W9]m  
void CCaptureDlg::SaveBmp() r=`]L-}V  
{ #Fl5]> |  
 CDC dc; oD0N<Ln}  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ? eU=xO  
 CBitmap bm; gmU0/z3&  
 int Width=GetSystemMetrics(SM_CXSCREEN); q3~RK[OCq  
 int Height=GetSystemMetrics(SM_CYSCREEN); {e3XmVAI  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ]t23qA@^2  
 CDC tdc; 2&k5X-Y  
 tdc.CreateCompatibleDC(&dc); ~I_v {  
 CBitmap*pOld=tdc.SelectObject(&bm); 6pKb!JJ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); !R`)S7!  
 tdc.SelectObject(pOld); w|;kL{(W  
 BITMAP btm; 7wm9S4+|  
 bm.GetBitmap(&btm); 4raKhN"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; CQ(;L{}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xIrRFK9[Q  
 BITMAPINFOHEADER bih; 8%Wg;:DZx  
 bih.biBitCount=btm.bmBitsPixel; ;`TSu5/  
 bih.biClrImportant=0; ,J (+%#$UT  
 bih.biClrUsed=0; cl4Vi%   
 bih.biCompression=0; VgoN=S  
 bih.biHeight=btm.bmHeight; .&Vy o<9Ck  
 bih.biPlanes=1; Wb|xEwqd`  
 bih.biSize=sizeof(BITMAPINFOHEADER); p{sbf;-x}  
 bih.biSizeImage=size; W$l%= /  
 bih.biWidth=btm.bmWidth; x;G~c5  
 bih.biXPelsPerMeter=0; X53TFRxnT  
 bih.biYPelsPerMeter=0; $_5@ NOZ,M  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); HLP nbI-+  
 static int filecount=0; JLZ[sWP='  
 CString name; T9c=As_EM  
 name.Format("pict%04d.bmp",filecount++); n1Y3b~E?E  
 name=m_Path+name; UT^-!L LB]  
 BITMAPFILEHEADER bfh; AIx,c1G]K  
 bfh.bfReserved1=bfh.bfReserved2=0; g#=~A&4q  
 bfh.bfType=((WORD)('M'<< 8)|'B'); f\Fk+)e@  
 bfh.bfSize=54+size; :=<0Z1S  
 bfh.bfOffBits=54; e2onR~Cf  
 CFile bf; 1VH$l(7IQ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ mJ>@Dh3>G  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bhI yq4N  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); r%QnV0L^  
  bf.WriteHuge(lpData,size); oQkY@)3.w  
  bf.Close(); g.cD3N  
  nCount++; #ilU(39e  
 } lF=l|.c  
 GlobalFreePtr(lpData); <Bmqox0  
 if(nCount==1) ]{[8$|Mg  
  m_Number.Format("%d picture captured.",nCount); pxF<L\L?:  
 else !A6l\_  
  m_Number.Format("%d pictures captured.",nCount); c1,dT2:=  
  UpdateData(FALSE); !Gphs`YI  
} P@u&~RN9f+  
Rilr)$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) pO~VI$7  
{ >/kwy2  
 if(pMsg -> message == WM_KEYDOWN) ice7J2r_  
 { bwo{ Lw~  
  if(pMsg -> wParam == VK_ESCAPE) CD]2a@j {  
   return TRUE; wc-ll&0Z  
  if(pMsg -> wParam == VK_RETURN) Ul<'@A8  
   return TRUE; )>! IY Q  
 } 'm;M+:l 6  
 return CDialog::PreTranslateMessage(pMsg); GisI/Ir[  
} V!'N:je  
/$IF!q+C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) is3nLm(  
{ %Ps DS  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ QSn%~o05  
  SaveBmp(); :\0q\2e[<  
  return FALSE; Se o3a6o  
} i>Cxi ZT  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ")q{>tV  
 CMenu pop; ~/@5&ajz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >gt_C'  
 CMenu*pMenu=pop.GetSubMenu(0); XZcT-w 7  
 pMenu->SetDefaultItem(ID_EXITICON); xr2ew%&o  
 CPoint pt; u% ^Lu.l_c  
 GetCursorPos(&pt); DIk\=[{2q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I82?sQ7  
 if(id==ID_EXITICON) "4{_amgm&<  
  DeleteIcon(); A~vZ}?*M  
 else if(id==ID_EXIT) LE15y>  
  OnCancel(); xLE+"6;W  
 return FALSE; !n=@(bT*wT  
} brQkVt_)EE  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); cI)XXb4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A2` QlhZ  
 AddIcon(); bb6 ~H  
 return res; ;|2h&8yX(/  
} sP0pw]!  
u5f+%!p  
void CCaptureDlg::AddIcon() ~urV`J  
{ :'OCQ.[{s  
 NOTIFYICONDATA data; gyW*-:C  
 data.cbSize=sizeof(NOTIFYICONDATA); L`i#yXR  
 CString tip; +s6 wF{  
 tip.LoadString(IDS_ICONTIP); 1MtvnPY  
 data.hIcon=GetIcon(0); W#<&(s4  
 data.hWnd=GetSafeHwnd(); Dm@wTt8N(  
 strcpy(data.szTip,tip); XUD/\MoV  
 data.uCallbackMessage=IDM_SHELL; Y$^x.^dT,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kT(}>=]g  
 data.uID=98; Nk-biD/J  
 Shell_NotifyIcon(NIM_ADD,&data); _v=@MOI/J  
 ShowWindow(SW_HIDE); ]Q\Ogfjp  
 bTray=TRUE; D_6GzgZ  
} :x*8*@kC  
:<%q9)aPf`  
void CCaptureDlg::DeleteIcon() n2bL-  
{ mm3goIi; Y  
 NOTIFYICONDATA data; n6gYZd  
 data.cbSize=sizeof(NOTIFYICONDATA); S7Xr~5>X  
 data.hWnd=GetSafeHwnd(); J&{qe@^  
 data.uID=98; vqLC?{i+  
 Shell_NotifyIcon(NIM_DELETE,&data); d[.kGytUt  
 ShowWindow(SW_SHOW); 2`#jw)dM;}  
 SetForegroundWindow(); $'f<4  
 ShowWindow(SW_SHOWNORMAL); bQ-5uFe~$B  
 bTray=FALSE; &bx;GG\<4  
} 8wz4KG3SK  
%h** L'~``  
void CCaptureDlg::OnChange() H|='|k5Y.  
{ 8Ek<J+& |I  
 RegisterHotkey(); #e.2m5T  
} Na^1dn  
khl(9R4a  
BOOL CCaptureDlg::RegisterHotkey() W{Cc wq  
{ Q dKxuG  
 UpdateData(); k]<  
 UCHAR mask=0; V1KWi ^  
 UCHAR key=0; \s2hep  
 if(m_bControl) -ob_]CKtJ~  
  mask|=4; ZdEeY|j  
 if(m_bAlt) a1p:~;f}[  
  mask|=2; DBl.bgf  
 if(m_bShift) %zHNX4  
  mask|=1; ^4Ra$<  
  key=Key_Table[m_Key.GetCurSel()]; U,C L*qTF  
 if(bRegistered){ #q~SfG  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1<]g7W  
  bRegistered=FALSE; ?lv{;4BC  
 } &\][:kG;  
 cMask=mask; 9?r|Y@xh]  
 cKey=key; ~UjFL~K}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 09"C&X~  
 return bRegistered; e{/(NtKf  
} p.q :vI$J  
Lj"~6l`)  
  四、小结 r)<]W@ Pr  
ze Qgg|;  
  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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