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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: I$n 0aR6  
  ^a[7qX_B  
  一、实现方法 zKx?cEpE  
kmi[u8iXD_  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: g*N~r['dZ  
NC>rZS]  
#pragma data_seg("shareddata") X<x"\Yk  
HHOOK hHook =NULL; //钩子句柄 @r%[e1.  
UINT nHookCount =0; //挂接的程序数目 o`+6E q0w  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 XK`>#*"V  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 yXh=~:1~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey (i.MxG Dd  
static int KeyCount =0; 5H6m{ng  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 -=&r}/&  
#pragma data_seg() hWJ\dwF  
- A x$Y  
  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。 )p~\lM}?d  
E=Ah_zKU  
  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: qy`@\)S/5  
E&Pv:h,pV&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H2BD5  
cKey,UCHAR cMask) czi$&(N0w$  
{ 6;dQ#wmg  
 BOOL bAdded=FALSE; qx18A  
 for(int index=0;index<MAX_KEY;index++){ 0F8y8s  
  if(hCallWnd[index]==0){ (Q o  
   hCallWnd[index]=hWnd; E b-?wzh  
   HotKey[index]=cKey; >DBaKLu\  
   HotKeyMask[index]=cMask; <K=:_  
   bAdded=TRUE; ~%qHJ4C  
   KeyCount++; )TP 1i  
   break; -N<s =  
  } x>A(016:C  
 } ~ k/'_1)c  
 return bAdded; _VMW-trG  
} W2O =dG`  
//删除热键 Lco JltY{5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Om0Z\GP=  
{ @.yp IE\  
 BOOL bRemoved=FALSE; 'v GrbmK  
 for(int index=0;index<MAX_KEY;index++){ !>TVDN>  
  if(hCallWnd[index]==hWnd){ 4`o_r%   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3!_y@sWx  
    hCallWnd[index]=NULL; elG<\[  
    HotKey[index]=0; U; JZN  
    HotKeyMask[index]=0;  \U(qv(T  
    bRemoved=TRUE; F-R4S^eV  
    KeyCount--; ZN~:^,PO/  
    break; "^fcXV9Wp  
   } H{VVxj  
  } %E}f7GT 4  
 } J(ZYoJ  
 return bRemoved; ]OL O~2j  
} oS 7q#`  
0j %s H  
-|\V'  
  DLL中的钩子函数如下: ;+'x_'a  
NTASrh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V2Q2(yvdJ  
{ sWX iY  
 BOOL bProcessed=FALSE; ]R32dI8N  
 if(HC_ACTION==nCode) "-C.gqoB  
 { Y #E/"x%+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 5%,J@&5G s  
   switch(wParam) 5 < wIJ5t  
   {  1//d68*"  
    case VK_MENU: F.i*'x0u  
     MaskBits&=~ALTBIT; i+( k  
     break; }dQW -U  
    case VK_CONTROL: @;_xFL;{g  
     MaskBits&=~CTRLBIT; K'kWL[Ut!  
     break; .:A9*,  
    case VK_SHIFT: 8C7$8x] mM  
     MaskBits&=~SHIFTBIT; -`sK?*[{J  
     break; :V*c9,>ZO  
    default: //judge the key and send message wa-#C,R\_#  
     break; sgu#`@o  
   } HJ?p,V q5_  
   for(int index=0;index<MAX_KEY;index++){ 9gVu:o 1/  
    if(hCallWnd[index]==NULL) v^1_'P AXu  
     continue; k%YvJXL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ShbW[*5  
    { V]dzKNFi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Clr~:2g\  
     bProcessed=TRUE; ?9'Ukw` g  
    } Xb6X'rY  
   } }K1v=k  
  } ad+@2-Y  
  else if((lParam&0xc000ffff)==1){ //有键按下 U2 m86@E  
   switch(wParam) m>B^w)&C  
   { hg[ob+"  
    case VK_MENU: %"B+;{y(5  
     MaskBits|=ALTBIT; LI1OocY.]  
     break; i eQQ{iGJH  
    case VK_CONTROL: 4WU%K`jnXb  
     MaskBits|=CTRLBIT; qIIc>By(\"  
     break; g\^7Q  
    case VK_SHIFT: "i0{E!,XL  
     MaskBits|=SHIFTBIT; , 7-@eZ  
     break; r#hA kOw  
    default: //judge the key and send message = i9|lU"Va  
     break; (Qq;ySZ#  
   } %ub\+~  
   for(int index=0;index<MAX_KEY;index++){ x8 :  
    if(hCallWnd[index]==NULL) bwN>E+  
     continue; 8WU_d`DF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p?F%a;V3  
    { Xy/lsaVskX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); WX<),u2@  
     bProcessed=TRUE; +)YU/41W  
    } tk=~b} 8  
   } z0|%h?N  
  } 'b(V8x  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4UP#~  
   for(int index=0;index<MAX_KEY;index++){ FbO\#p s  
    if(hCallWnd[index]==NULL) h[H FZv~{  
     continue; ?=$=c8xw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q$IgkL  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Jd#g"a>zZ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 zv/owK  
   } x[L/d"Wf  
  } >F7v'-*{  
 } (Klvctoy  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =, kH(rp2  
} >wx1M1  
Q|T9 tc->  
  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: tA;#yM;  
N;N,5rxV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Eci,];S7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +'aG&^k4  
G_OLUuK?C  
  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: mtfEK3?2*  
NABVU0}   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^q{=mf`  
{ KlOL5"3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Sy\ec{$+V]  
 { o& -c5X4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =XAFW  
  SaveBmp(); (.D|%P  
  return FALSE; BuwJR Ql.  
 } =6Z$nc R  
 …… //其它处理及默认处理 #>)OLKP  
} N-C=O  
lHl1Ny\?  
R|tf}~u !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。 Xh'_Vx{.j`  
xi3  
  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。 nG B jxhl  
tUzef  
  二、编程步骤 [OTZ"XQLI  
2o5Pbdel  
  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"; ~# ~XDcc  
(Qf"|3R4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Fh[Gq  
{ [S@+  
  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; cHr.7 w  
U_\3preF  
  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; CEOD$nYc  
JY6&CL`C  
  5、 添加代码,编译运行程序。 `)Z+]5:  
DMeP9D  
三、程序代码 ^j-w^)@T  
#}y(D{zc  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8y$c\Eu(mF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) xNLvK:@0p  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ IgxZ_2hO  
#if _MSC_VER > 1000 (A<'{J#5,  
#pragma once (bT3 r_  
#endif // _MSC_VER > 1000 iRwlK5(&  
#ifndef __AFXWIN_H__ F@C^nX9  
#error include 'stdafx.h' before including this file for PCH Aw~N"i  
#endif TOUP.,f/!  
#include "resource.h" // main symbols \7l% @  
class CHookApp : public CWinApp &uX| Ksq  
{ cwK+{*ZH/  
 public: ;`p!/9il  
  CHookApp(); %+A z X  
  // Overrides %BV 2 q  
  // ClassWizard generated virtual function overrides <Oyxzs  
  //{{AFX_VIRTUAL(CHookApp) ?A]@$  
 public: c+_F}2)  
  virtual BOOL InitInstance(); V( /=0H/ F  
  virtual int ExitInstance(); 4pkTOQq_tQ  
  //}}AFX_VIRTUAL qjc8$#zXS  
  //{{AFX_MSG(CHookApp) /d/Quro  
  // NOTE - the ClassWizard will add and remove member functions here. #" 3az8u  
  // DO NOT EDIT what you see in these blocks of generated code ! C{"uz_Gh  
  //}}AFX_MSG ?:8wDV  
  DECLARE_MESSAGE_MAP() "M`ehgCBr  
}; c <T'_93  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); VlLc[eVV  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !"dn!X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !Eof7LUE  
BOOL InitHotkey(); <kY ||  
BOOL UnInit(); ]t'bd <O  
#endif ,:G3Y )  
kJy bA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ab5uZ0@  
#include "stdafx.h" _jhdqON6E  
#include "hook.h" JsA9Xdk`  
#include <windowsx.h> 0lyCk }c  
#ifdef _DEBUG W;^bc*a_  
#define new DEBUG_NEW QqS?-   
#undef THIS_FILE "-tTN  
static char THIS_FILE[] = __FILE__; P@RUopu,i  
#endif G\HU%J  
#define MAX_KEY 100 r]0UF0#  
#define CTRLBIT 0x04 X*cf|g  
#define ALTBIT 0x02 @C}Hx;f6  
#define SHIFTBIT 0x01 T-'B-g  
#pragma data_seg("shareddata") Nvef+L,v  
HHOOK hHook =NULL; 4_A9o9&_Rh  
UINT nHookCount =0; XIrNT:h4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |H(Mmqgk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT lvyD#|P  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey TYs#v/)I  
static int KeyCount =0; .x^`y2'U  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1V@\L|Y  
#pragma data_seg() cv'Fc  
HINSTANCE hins; INHN=KY{  
void VerifyWindow(); o}iqLe\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) VB?mr13}G  
//{{AFX_MSG_MAP(CHookApp) +]!`>  
// NOTE - the ClassWizard will add and remove mapping macros here. qZ39TTQ*p  
// DO NOT EDIT what you see in these blocks of generated code! JW5SBt>  
//}}AFX_MSG_MAP w|1Gb[  
END_MESSAGE_MAP() ElEa*70~g  
hVfiF  
CHookApp::CHookApp() bnWKfz5  
{ `Al[gG?/!  
 // TODO: add construction code here, .)wj{(>TJ  
 // Place all significant initialization in InitInstance 0M?nXHA[  
} vGk}r  
!Qg%d&q.Sx  
CHookApp theApp; ;[_w&"[6a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :EUV#5V.  
{ , yC-QFQE  
 BOOL bProcessed=FALSE; oc2aE:>X  
 if(HC_ACTION==nCode) jZ'y_  
 { FZ)Y<r8|s  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7{vnhl(Z  
   switch(wParam) ~YuRi#CTD:  
   { C+WHg-l  
    case VK_MENU: ; md{T'  
     MaskBits&=~ALTBIT; 9u'hCi(  
     break; 3,K*r"=  
    case VK_CONTROL: F7(~v2|  
     MaskBits&=~CTRLBIT; GMw|@?:{  
     break; J-W, ^%  
    case VK_SHIFT: Y=gj{]4  
     MaskBits&=~SHIFTBIT; ]c8$%  
     break; =f)S=0UF  
    default: //judge the key and send message VesO/xG<  
     break; o3;u*f0rWn  
   } X-Sso9/q.  
   for(int index=0;index<MAX_KEY;index++){ EO|r   
    if(hCallWnd[index]==NULL) ))n7.pB9/  
     continue; o(W|BD!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @"~Mglgw  
    { %qzpt{'?<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u+]v. Mt  
     bProcessed=TRUE; |wf:|%  
    } zS:89y<  
   } lPS A  
  } t9&z|?Vz  
  else if((lParam&0xc000ffff)==1){ //Key down E(T6s^8  
   switch(wParam) xNNoB/DR  
   { ta+'*@V +G  
    case VK_MENU: }*n(RnCn  
     MaskBits|=ALTBIT; O=1uF  
     break; c;w~-7Q*|  
    case VK_CONTROL: h(;qnV'c  
     MaskBits|=CTRLBIT; o8P 5C4y  
     break; hfY Ieb#91  
    case VK_SHIFT: ? OBe!NDf  
     MaskBits|=SHIFTBIT; ^i{B8]2,  
     break; %*.;3;m  
    default: //judge the key and send message xDBEs*  
     break; F<?e79},`  
   } KJa?TwnC  
   for(int index=0;index<MAX_KEY;index++) ?ng?>!  
   { y+RT[*bX5o  
    if(hCallWnd[index]==NULL) %r5&CUE5?  
     continue; Y2Mti- \  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Vgs( feGs  
    { JF*JF Ob  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F9e$2J)C  
     bProcessed=TRUE; x5m .MQ J  
    } r^P}xGGK  
   } SVp]}!jI  
  } 0k5Z l?  
  if(!bProcessed){ tg~&kaz  
   for(int index=0;index<MAX_KEY;index++){ 66=6;77  
    if(hCallWnd[index]==NULL) yZ,k8TJ",  
     continue; `n:IXD5'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,{c9Lv%@J  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #VC^><)3  
   } =JyYU*G4  
  } )2oWoZ vi9  
 } FTt7o'U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DR9M8E  
} =&,zWNz)  
=~Jv*c  
BOOL InitHotkey() q*A2>0O  
{ \%NhggS*  
 if(hHook!=NULL){ nJ4h9`[>V  
  nHookCount++; 4j!MjlG$  
  return TRUE; .i/]1X*;r^  
 } (0W%Y Z!&  
 else i^uC4S~  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  zUqiz  
  if(hHook!=NULL) )dLESk  
   nHookCount++; _]tR1T5e  
  return (hHook!=NULL); .jr1<LE  
} Ta!.oC[  
BOOL UnInit() g\ @nA4  
{ n/s!S &  
 if(nHookCount>1){ mN?'Aey  
  nHookCount--; 'N5qX>Ob  
  return TRUE; 1 X2oz  
 } m7kDxs(KO  
 BOOL unhooked = UnhookWindowsHookEx(hHook); U:MkA(S%c  
 if(unhooked==TRUE){  ~u8}s4  
  nHookCount=0; aQN`C {nY  
  hHook=NULL; #rV=!j||  
 } /[[zAq{OA  
 return unhooked; N)RWC7th{  
} 9Pd~  
% @Ks<"9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fB"3R-H?O  
{ S#+G?I3w  
 BOOL bAdded=FALSE; d"XS;;l%<  
 for(int index=0;index<MAX_KEY;index++){ 5]; 8  
  if(hCallWnd[index]==0){ ;k7` `  
   hCallWnd[index]=hWnd; ]Vl5v5_  
   HotKey[index]=cKey; Ats"iV  
   HotKeyMask[index]=cMask; {<~XwJ.  
   bAdded=TRUE; z.Y7u3K.8  
   KeyCount++; $Miii`VS9  
   break; $2>tfKhtA  
  } 2>fG}qYy$  
 } yL.si)h(p  
 return bAdded; 'A !Dg  
} uA!T@>vl  
B0q![  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8t}=?:B+{  
{ gRdE6aIZ  
 BOOL bRemoved=FALSE; #jr;.;8sQ  
 for(int index=0;index<MAX_KEY;index++){ S97.O@V!$  
  if(hCallWnd[index]==hWnd){ g,y`[dr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9qXHdpb#g"  
    hCallWnd[index]=NULL; M=o,Sav5*  
    HotKey[index]=0; 1a4QWGpq  
    HotKeyMask[index]=0; +@%9pbM"z  
    bRemoved=TRUE; V.Xz n  
    KeyCount--; ~JLqx/[|s  
    break; v_c'npC  
   } <?qmB }Y  
  } h,140pW  
 } z8Dn<h  
 return bRemoved; !kASEjFz|f  
} ZFW}Vnl  
{K3\S 0L  
void VerifyWindow() dN |w;|M  
{ //ZB B,[@  
 for(int i=0;i<MAX_KEY;i++){ GeHDc[7  
  if(hCallWnd!=NULL){ FbFUZ^Zj  
   if(!IsWindow(hCallWnd)){ =#Vdz=.  
    hCallWnd=NULL; d*A>P  
    HotKey=0; 1uV_C[:  
    HotKeyMask=0; ,C&h~uRi#f  
    KeyCount--; 6^{ hY^Z  
   } lBG* P>;  
  } 82J0t}:U  
 } '12|:t&7  
} wmo'Pl  
 QV .A.DK  
BOOL CHookApp::InitInstance() &@+K%qW[e  
{ \|62E):i1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 87<y_P@{  
 hins=AfxGetInstanceHandle(); mnmwO(.  
 InitHotkey(); 3sp*.dk  
 return CWinApp::InitInstance(); {f^30Fw  
} "E''ZBLO~  
V'K$:9^x[8  
int CHookApp::ExitInstance() P< WD_W  
{ G~B V^  
 VerifyWindow(); >P0AGZ  
 UnInit(); ]NFDE-Jz]  
 return CWinApp::ExitInstance(); Gzp)OHgJ  
} Plq [Ml9  
y'@l,MN{  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *?K` T^LS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) oQ yG  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .k*2T<p$rC  
#if _MSC_VER > 1000 Q.y KbO<[  
#pragma once 2OT6*+D  
#endif // _MSC_VER > 1000 akCl05YW  
M;iaNL(  
class CCaptureDlg : public CDialog *|E@ 81s#  
{ C>K/C!5?  
 // Construction M9&tys[KX  
 public: ~ml\|  
  BOOL bTray; 8V|-BP5^  
  BOOL bRegistered; %BG5[ XQ7  
  BOOL RegisterHotkey(); xrX("ili  
  UCHAR cKey; Bp/8 >E O`  
  UCHAR cMask; GzB%vsv9 5  
  void DeleteIcon(); "V^jAPDXb  
  void AddIcon(); %[Ds-my2  
  UINT nCount; I^ >zr.z A  
  void SaveBmp(); &9ZIf#R  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H~G=0_S  
  // Dialog Data CqX%V":2  
  //{{AFX_DATA(CCaptureDlg)  aZ0H)  
  enum { IDD = IDD_CAPTURE_DIALOG }; ix#  
  CComboBox m_Key; RsOK5XnQn  
  BOOL m_bControl; l:|Fs=\  
  BOOL m_bAlt; H~~(v52wD  
  BOOL m_bShift; yv:NH|,/y  
  CString m_Path; @<6-uk3S  
  CString m_Number; X_YD[  
  //}}AFX_DATA V3+%KkN  
  // ClassWizard generated virtual function overrides '~2v/[<`}  
  //{{AFX_VIRTUAL(CCaptureDlg) &qpA<F@7  
 public: 5:PZ=jPR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); B}FF |0<  
 protected: z::2O/ho  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C=b5[, UCB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 785iY865  
  //}}AFX_VIRTUAL (i?^g &  
  // Implementation 6h,'#|:d  
 protected: #[xNE C)  
  HICON m_hIcon; Z*QRdB%,  
  // Generated message map functions N-Z 9  
  //{{AFX_MSG(CCaptureDlg) p{,fWk  
  virtual BOOL OnInitDialog(); }I10hy~W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); qB:`tHy  
  afx_msg void OnPaint(); Hb$q}1+y  
  afx_msg HCURSOR OnQueryDragIcon(); mzw*6e2T  
  virtual void OnCancel(); h/k`+  
  afx_msg void OnAbout(); DVS7N_cx2o  
  afx_msg void OnBrowse(); n$?oZ *;  
  afx_msg void OnChange(); Lf:Z (Z>  
 //}}AFX_MSG ;8v5 qz  
 DECLARE_MESSAGE_MAP()  {Eb6.  
}; Cn<kl^!Q-  
#endif -s1VlS/  
Y5opZ G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C;ye%&g>  
#include "stdafx.h" I|5OCTu  
#include "Capture.h" w '"7~uN  
#include "CaptureDlg.h" Zk[#B UA  
#include <windowsx.h> :h3JDQe:.  
#pragma comment(lib,"hook.lib") L!G3u/  
#ifdef _DEBUG 7.t$#fzi  
#define new DEBUG_NEW <>Im$N ai  
#undef THIS_FILE =3:ltI.'*I  
static char THIS_FILE[] = __FILE__; 3 /e !7  
#endif RW)C<g  
#define IDM_SHELL WM_USER+1 UGMdWq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3IkG*enI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Pm_=   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 21[F%,{.),  
class CAboutDlg : public CDialog IW#(ICeb  
{ #n"/9%35f`  
 public: ?xet:#R'  
  CAboutDlg(); Txh;r.1e  
  // Dialog Data O+N-x8W{  
  //{{AFX_DATA(CAboutDlg) <gy'@w?  
  enum { IDD = IDD_ABOUTBOX }; 0d2%CsMS"D  
  //}}AFX_DATA tFQFpbI  
  // ClassWizard generated virtual function overrides $3ILVT  
  //{{AFX_VIRTUAL(CAboutDlg) 4HJrR^  
 protected: Qi61(lK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3C2 >   
  //}}AFX_VIRTUAL &M!:,B  
  // Implementation "mf;k^sqS  
 protected: Xy{+=UY  
  //{{AFX_MSG(CAboutDlg) uE$o4X  
  //}}AFX_MSG 4Rn i7qH  
  DECLARE_MESSAGE_MAP() 8{YxUD  
};  V("1\  
_biJch  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D/WS  
{ {JgN^R<5<f  
 //{{AFX_DATA_INIT(CAboutDlg) p"@|2a  
 //}}AFX_DATA_INIT X`b5h}c  
} [oj"Tn(  
SXEiyy[7v  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ht |r+v-  
{ >`:+d'Jv0  
 CDialog::DoDataExchange(pDX); 66*o2D\Q*G  
 //{{AFX_DATA_MAP(CAboutDlg) PwW@I~@>  
 //}}AFX_DATA_MAP 'gGB-=yvbO  
} E@Fen CF  
X d6y7s  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0 *\=Q$Yy  
 //{{AFX_MSG_MAP(CAboutDlg) @2gMtf?<  
 // No message handlers K5SO($  
 //}}AFX_MSG_MAP YSgF'qq\  
END_MESSAGE_MAP() )VT/kIq-U  
{/<&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) (=j!P*  
: CDialog(CCaptureDlg::IDD, pParent) +mQSlEo  
{ pQNFH)=nw  
 //{{AFX_DATA_INIT(CCaptureDlg) o__q)"^~-  
  m_bControl = FALSE; L ~w=O!  
  m_bAlt = FALSE; 3o>t ~Sfi  
  m_bShift = FALSE; ^|C|=q~:  
  m_Path = _T("c:\\"); F0Hbklr  
  m_Number = _T("0 picture captured.");  B]7jg9/  
  nCount=0; Kxn7sL$]=F  
  bRegistered=FALSE; 7&4,',0VL  
  bTray=FALSE; L|LTsRIq  
 //}}AFX_DATA_INIT arZIe+KW  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +QX>:z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); l i-YkaP  
} kP$g l|  
YkX=n{^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) TeJ `sJ  
{  iC]lO  
 CDialog::DoDataExchange(pDX); iC-ABOOu{l  
 //{{AFX_DATA_MAP(CCaptureDlg) 4:$>,D\  
  DDX_Control(pDX, IDC_KEY, m_Key); B! V{.p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); EcIQ20Z_-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \]xYV}(FO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); h>:RCpC  
  DDX_Text(pDX, IDC_PATH, m_Path); "zbE  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5>)jNtZ  
 //}}AFX_DATA_MAP / JB4#i7  
} )*h~dx_cm  
)_cv}.xe  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @ WaYU  
//{{AFX_MSG_MAP(CCaptureDlg) K*$#D1hG  
 ON_WM_SYSCOMMAND() <q\) o_tH  
 ON_WM_PAINT() $0T"YC%  
 ON_WM_QUERYDRAGICON() 2(Uz9!<V  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2 -aYqMmT;  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sv"mba.J  
 ON_BN_CLICKED(ID_CHANGE, OnChange) M%xL K7  
//}}AFX_MSG_MAP s2~dmZ_B|_  
END_MESSAGE_MAP() AF]!wUKxy  
S:/RYT"  
BOOL CCaptureDlg::OnInitDialog() 1i:g /H  
{ OL5HofgNm  
 CDialog::OnInitDialog(); )H)Udhz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); CDnz &?  
 ASSERT(IDM_ABOUTBOX < 0xF000); /T[ICd2J  
 CMenu* pSysMenu = GetSystemMenu(FALSE); |+-i'N9  
 if (pSysMenu != NULL) RWCS u$  
 { &pjV4m|j<  
  CString strAboutMenu; ~aAJn IO  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Y,btL'[W  
  if (!strAboutMenu.IsEmpty()) f<Tz#w&6W  
  { a +yI2s4Z  
   pSysMenu->AppendMenu(MF_SEPARATOR); o '/C$E4W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;bZ*6-\!-  
  } 1Uk~m  
 } JyC&L6[]Z  
 SetIcon(m_hIcon, TRUE); // Set big icon xY2_*#{.  
 SetIcon(m_hIcon, FALSE); // Set small icon ROS"VV<  
 m_Key.SetCurSel(0); h;qy5KS  
 RegisterHotkey(); ^alZ\!B8  
 CMenu* pMenu=GetSystemMenu(FALSE); R2THL  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Wx$q:$h@q  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); FJ8@b  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); BK9x`Oo2  
 return TRUE; // return TRUE unless you set the focus to a control '<< ~wt  
} %aBJ+V F  
:gscW& k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KTjlWxD  
{ ,,%:vK+V  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) V9u\;5oL  
 { 9zYiG3 d  
  CAboutDlg dlgAbout; NjN?RB/5  
  dlgAbout.DoModal(); cvE.r330|  
 } LG{inhbp  
 else 7'i#!5  
 { 6\fMzm  
  CDialog::OnSysCommand(nID, lParam); RS `9?c:  
 } U q w}4C/0  
} 5}bZs` C  
D%UZ'bHN*  
void CCaptureDlg::OnPaint() q|i%)V`)-  
{ $?J+dB  
 if (IsIconic()) igB rmaY'  
 {  G].__]  
  CPaintDC dc(this); // device context for painting gT&'i(c  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); #z!Hb&Qi\  
  // Center icon in client rectangle RB7AI !'a?  
  int cxIcon = GetSystemMetrics(SM_CXICON); yISQYvSN  
  int cyIcon = GetSystemMetrics(SM_CYICON); aT:AxYn8  
  CRect rect; L'XdX\5  
  GetClientRect(&rect); |F@xwfgb  
  int x = (rect.Width() - cxIcon + 1) / 2; x X/s1(P  
  int y = (rect.Height() - cyIcon + 1) / 2; IAF;mv}'  
  // Draw the icon Secq^#]8  
  dc.DrawIcon(x, y, m_hIcon); M'zS7=F!:  
 } 5 k%9>U%$  
 else q7f;ZK=f  
 { N&^xq_9&  
  CDialog::OnPaint(); h@;)dLo0z  
 } 1i/::4=  
} nt0\q'&  
)R8%'X;U  
HCURSOR CCaptureDlg::OnQueryDragIcon() Th^(f@.w  
{ R G0S  
 return (HCURSOR) m_hIcon; Afy .3T @)  
} (y~laW!  
MATgJ`lsy  
void CCaptureDlg::OnCancel() mvq7G  
{ PB(  
 if(bTray) mPfUJ#rS  
  DeleteIcon(); 1%spzkE 3P  
  CDialog::OnCancel(); 6UW:l|}4#2  
} Z@,PZ   
WVWS7N\  
void CCaptureDlg::OnAbout() n(1wdlEp  
{ ^{*f3m/  
 CAboutDlg dlg; 2Za ,4'  
 dlg.DoModal(); o"#TZB+k  
} '9 e\.  
&{E`=4T2  
void CCaptureDlg::OnBrowse() _jTwiuMS-  
{ 9 rTz N  
 CString str; lH)em.#  
 BROWSEINFO bi; #~4{`]W6  
 char name[MAX_PATH]; vXWsF\g  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); slge+xq\J  
 bi.hwndOwner=GetSafeHwnd(); %l:|2s:  
 bi.pszDisplayName=name; M U?{?5  
 bi.lpszTitle="Select folder"; xaWGa1V'z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; h41$|lonU%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z>x7|Q3CX  
 if(idl==NULL) m0|Ae@g~3  
  return; Zj1ZU[BEcL  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); J3~hzgY  
 str.ReleaseBuffer(); ,](v?v.[4  
 m_Path=str; 0L:V#y-*  
 if(str.GetAt(str.GetLength()-1)!='\\') lmhbF  
  m_Path+="\\"; 1Y=AT!"V  
 UpdateData(FALSE); ', sQ/#S  
} xvR?~  
-@SOo"P  
void CCaptureDlg::SaveBmp() < TR/ `  
{ my ;  
 CDC dc; ik2- OM  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &[5n0e[  
 CBitmap bm; `RL,ZoYuu  
 int Width=GetSystemMetrics(SM_CXSCREEN); 8 "_Bq  
 int Height=GetSystemMetrics(SM_CYSCREEN); @ /UOSU  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =[P%_v``  
 CDC tdc; ~V2ajM1Z&O  
 tdc.CreateCompatibleDC(&dc); N7*CP|?E  
 CBitmap*pOld=tdc.SelectObject(&bm); ]*2EK9<  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); L\b]k,Ksf  
 tdc.SelectObject(pOld); _%wK}eH+sy  
 BITMAP btm; -G],H)M  
 bm.GetBitmap(&btm); 731h ~x!u  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (0E U3w?]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); &Y,Q>bu  
 BITMAPINFOHEADER bih; wJ+U[a  
 bih.biBitCount=btm.bmBitsPixel; Ap]4QqU  
 bih.biClrImportant=0; L1hD}J'$4  
 bih.biClrUsed=0; 'e.q 7Jpd  
 bih.biCompression=0; w"cM<Ewu  
 bih.biHeight=btm.bmHeight; 4%wq:y< )/  
 bih.biPlanes=1; $D QD$  
 bih.biSize=sizeof(BITMAPINFOHEADER); xLx"*jyL  
 bih.biSizeImage=size; K2cq97k,d  
 bih.biWidth=btm.bmWidth; 8jy-z"jc  
 bih.biXPelsPerMeter=0; Fweh =v  
 bih.biYPelsPerMeter=0; >Hi h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %z*29iKlI  
 static int filecount=0; )A="eW_>  
 CString name; Ia=_78MgZ  
 name.Format("pict%04d.bmp",filecount++); `$S^E !=  
 name=m_Path+name; umQi  
 BITMAPFILEHEADER bfh; ?}vzLgp  
 bfh.bfReserved1=bfh.bfReserved2=0; 2)wAFO6u  
 bfh.bfType=((WORD)('M'<< 8)|'B'); lPY@{1W  
 bfh.bfSize=54+size; ,b4):{  
 bfh.bfOffBits=54; S:ls[9G[3  
 CFile bf; 9i0M/vx  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ LZ~2=Y< U(  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); TdQ ]G2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); b.#^sm//  
  bf.WriteHuge(lpData,size); Z^s+vi  
  bf.Close(); *(k%MTG  
  nCount++; jip\4{'N  
 } f hQy36i@  
 GlobalFreePtr(lpData); }>V/H]B  
 if(nCount==1) MZT6g.ny  
  m_Number.Format("%d picture captured.",nCount); a3Y{lc#z}  
 else )ZH c$+fU  
  m_Number.Format("%d pictures captured.",nCount); &yE1U#J(  
  UpdateData(FALSE); (lb6]MtTHY  
} R6`*4z S  
0$tjNy e  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) qAqoZMpI|;  
{ R'zu"I  
 if(pMsg -> message == WM_KEYDOWN) \e<mSR  
 { /D0RC  
  if(pMsg -> wParam == VK_ESCAPE) 8;TAb.r  
   return TRUE; t)9]<pN%  
  if(pMsg -> wParam == VK_RETURN) [s~JceUyX  
   return TRUE; )ZGYhE  
 } [-\({<t3x  
 return CDialog::PreTranslateMessage(pMsg); 25d\!3#E  
} "K,bH  
YMT8p\ #rp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) U^[<  
{ Va7c#P?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 20aZI2sk`  
  SaveBmp();  EZ<80G  
  return FALSE; Jen%}\  
} X8Xn\E  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ V JDoH  
 CMenu pop; v dU%R\  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); a9=>r  
 CMenu*pMenu=pop.GetSubMenu(0); 8lwFAiC8  
 pMenu->SetDefaultItem(ID_EXITICON); }!8nO;  
 CPoint pt; d<x1*a  
 GetCursorPos(&pt); ;hwzYXWF  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); U/Wrh($ #4  
 if(id==ID_EXITICON) -/>9c-F  
  DeleteIcon(); "V4Q2T T  
 else if(id==ID_EXIT) vt.P*Z5  
  OnCancel(); }taLk@T  
 return FALSE; y}N&/}M:}8  
} S ZlC4=6c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ic E|.[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .s2$al  
 AddIcon(); G}VDEC  
 return res; o@9+mM"B)  
} w?*z^y@  
xYI;V7  
void CCaptureDlg::AddIcon() .n`( X#,*l  
{ :?=Q39O9  
 NOTIFYICONDATA data; XA)'=L!^  
 data.cbSize=sizeof(NOTIFYICONDATA); mG2VZ>  
 CString tip; N5? IpE  
 tip.LoadString(IDS_ICONTIP); yHNuU)Ft  
 data.hIcon=GetIcon(0); 7X}TB\N1  
 data.hWnd=GetSafeHwnd(); BX[~% iE  
 strcpy(data.szTip,tip); edijfhn  
 data.uCallbackMessage=IDM_SHELL; J!hFN]M<<  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; TQf L%JT  
 data.uID=98; abi[jxCG  
 Shell_NotifyIcon(NIM_ADD,&data); KlN/\N\  
 ShowWindow(SW_HIDE); XE1$K_m  
 bTray=TRUE; vT c7an6fy  
} YLOwQj'  
E ] B7  
void CCaptureDlg::DeleteIcon() D`pQ7  
{ 5qbq,#Pf  
 NOTIFYICONDATA data; jvHFFSK  
 data.cbSize=sizeof(NOTIFYICONDATA); uvnI>gv  
 data.hWnd=GetSafeHwnd(); pYo=oI  
 data.uID=98; KVR~jF%  
 Shell_NotifyIcon(NIM_DELETE,&data); <sX VW  
 ShowWindow(SW_SHOW); K]/Od  
 SetForegroundWindow(); ?^u^im  
 ShowWindow(SW_SHOWNORMAL); 2.-o@im0  
 bTray=FALSE; ?mx\eX{  
} -\#lF?fzb  
#DFp[\)1  
void CCaptureDlg::OnChange() mnjs(x<m  
{ u5Up&QE!>q  
 RegisterHotkey(); =dzWmL<~8  
} $DebXxJw0l  
4w4^yQE  
BOOL CCaptureDlg::RegisterHotkey() + P7o4]:/  
{ JoZ(_Jh%m  
 UpdateData(); *fnvZw?  
 UCHAR mask=0; FW..mD9)}  
 UCHAR key=0; 3[d>&xk@$  
 if(m_bControl) @;iXp>&&  
  mask|=4; 6L9, 'Bg  
 if(m_bAlt) *k [J6  
  mask|=2; &|9.}Z8U  
 if(m_bShift) |=6_ xRyr  
  mask|=1; r37[)kJ  
  key=Key_Table[m_Key.GetCurSel()]; 8 #}D : (  
 if(bRegistered){ %}3qR~;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 8(f:U@BS  
  bRegistered=FALSE; FhkkW W L  
 } 3mO;JXd  
 cMask=mask; m$wlflt  
 cKey=key; ]~0}=,H$N  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5~'IKcW<  
 return bRegistered; !eI2 r   
} /,s[#J   
}Fa%%}  
  四、小结 J?&l*_m;t  
V'G Ju  
  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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