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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: ]Idwy|eG  
  iQ(j_i'+!I  
  一、实现方法 _pZ <  
Z37Dv;&ZD  
  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: - _ 8-i1?  
*?d\Zcj85[  
#pragma data_seg("shareddata") q~ Z UtF  
HHOOK hHook =NULL; //钩子句柄 A{J?I:  
UINT nHookCount =0; //挂接的程序数目 ^)Awjj9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Yl>Y.SO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;tVd+[8  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey r7g@(K  
static int KeyCount =0; "yh2+97l  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 /g!ZU2&l  
#pragma data_seg() K>e-IxA);0  
>6jal?4u-  
  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。 V^R,j1*  
" "m-5PGYo  
  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: 9  @ <  
6E K<9M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5,##p"O(  
cKey,UCHAR cMask) -dO8Uis$  
{ q4w]9b/  
 BOOL bAdded=FALSE; p+|8(w9A${  
 for(int index=0;index<MAX_KEY;index++){ Z!~_#_Ugl  
  if(hCallWnd[index]==0){ ;$zvm`|:  
   hCallWnd[index]=hWnd; .Z'NH wCy  
   HotKey[index]=cKey; \wsVO"/  
   HotKeyMask[index]=cMask; 2wB *c9~  
   bAdded=TRUE; %L- qAI&V  
   KeyCount++; /CO=!*7fz  
   break; L&)e}"  
  } hZ452W  
 } K$,<<hl  
 return bAdded; mz%l4w?'  
} }q]*aADe  
//删除热键 }A@:JR+|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *cCx]C.~  
{ j3;W-c`5  
 BOOL bRemoved=FALSE; &U?4e'N)T  
 for(int index=0;index<MAX_KEY;index++){ Z8FgxR  
  if(hCallWnd[index]==hWnd){ <!FcQVH+L  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >AX_"Q~  
    hCallWnd[index]=NULL; ZCj1Cz]"l<  
    HotKey[index]=0; SyI~iW#Y1  
    HotKeyMask[index]=0; Qt {){uE  
    bRemoved=TRUE; $;G<!]& s  
    KeyCount--; 9ghzK?Yc  
    break; X"d"a={]  
   } y3 b"'-%  
  } m4oj1h_4  
 } tmq?h%O>  
 return bRemoved; }:c~5whN  
} 4V4S5V  
@@K/0:],  
u9KT_` )  
  DLL中的钩子函数如下: '_4apyq|  
_,60pr3D'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /huh}&NNu  
{ FCEmg0qdjD  
 BOOL bProcessed=FALSE; "Y L^j~A  
 if(HC_ACTION==nCode) t?-a JU  
 { r'#!w3*Cy  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 O.X;w<F/V  
   switch(wParam) ;@ixrj0u  
   {  rZpsC}C'  
    case VK_MENU: 0j4n1 1#  
     MaskBits&=~ALTBIT; A|1xK90^XT  
     break; KCbJ^Rln  
    case VK_CONTROL: >'q]ypA1  
     MaskBits&=~CTRLBIT; L-E?1qhP>  
     break; qx1Js3%  
    case VK_SHIFT: j>;1jzr2}  
     MaskBits&=~SHIFTBIT; -ak. wwx\  
     break; FWW@t1)  
    default: //judge the key and send message syg{qtBz^  
     break; 3e^0W_>6  
   } 0(Y,Q(JTo&  
   for(int index=0;index<MAX_KEY;index++){  0LL65[  
    if(hCallWnd[index]==NULL) V6[jhdb  
     continue; %La7);SeY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7glf?oE  
    { ^`lrKk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }JST(d&  
     bProcessed=TRUE; N atC}k  
    } v5\ALWy+p  
   } GB}\7a  
  } HAI) +J   
  else if((lParam&0xc000ffff)==1){ //有键按下 % vy,A*  
   switch(wParam) Gr&e]M[l  
   { N".BC|r  
    case VK_MENU: fi>.X99(G  
     MaskBits|=ALTBIT; 7Ko*`-p  
     break; P.q7rk<  
    case VK_CONTROL: dtY8>klI  
     MaskBits|=CTRLBIT; 2>^(&95M  
     break; ]5QXiF8`  
    case VK_SHIFT: CQ.C{  
     MaskBits|=SHIFTBIT; e8dZR3JL  
     break; ?'a>?al%>  
    default: //judge the key and send message v\8v'EDP  
     break; ^.)0O3oC  
   } oqh@ (<%  
   for(int index=0;index<MAX_KEY;index++){ Uaux0W  
    if(hCallWnd[index]==NULL) ]U'zy+  
     continue; s?m_zJh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C4ktCN  
    { qonStIP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); uwI"V|g%a&  
     bProcessed=TRUE; $rk=#;6]v;  
    } !ck~4~J  
   } D :j5/ *  
  } R'tvF$3=i  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 w=!xTA  
   for(int index=0;index<MAX_KEY;index++){ m?yztm~u  
    if(hCallWnd[index]==NULL) --"5yGOL  
     continue; [^}bc-9?i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8$]SvfX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); _u6N aB  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Q%q;=a  
   } hG~.Sc:G  
  } -a>CF^tH  
 } LNR1YC1c  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k)D5>T  
} `a[fC9  
,Nw2cv}D  
  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: &E0^Jz  
+RM!j9Rq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); MHt ~ZVH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $v2t6wS,"  
f ]_ki  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: &g90q   
DVwB}W~  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) g.!k>_g`  
{ PB"=\>]`N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) f,6V#,  
 { <>$CYTb  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 73S N\  
  SaveBmp(); E>-I |X"L1  
  return FALSE; G?b*e|@S  
 } OY81|N j  
 …… //其它处理及默认处理 6 F39'  
} #+_=(J  
iuXXFuh  
?R sPAL  
  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。 x\ # K2  
i9qIaG/  
  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。  9S9j  
6A =k;do  
  二、编程步骤 xH` VX-X3  
Dpu?JF]  
  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"; 98 NFJ  
vpT\ CjXHZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; tN)t`1_j  
^+d]'$  
  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; tK uJ &I~  
~@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;  `5(F'o  
iT| 7**+3  
  5、 添加代码,编译运行程序。 sd B(sbSF  
|Bi7:w  
三、程序代码 h$9ut@I  
.]4MtG  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9a+Y )?z  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Hq gg*4#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ y<nPZ<h  
#if _MSC_VER > 1000 uJ0'`Q?6R9  
#pragma once nvwf!iU6  
#endif // _MSC_VER > 1000 [FF}HWf  
#ifndef __AFXWIN_H__ nTtEv~a_n  
#error include 'stdafx.h' before including this file for PCH :EYUBtTj  
#endif jK[*_V  
#include "resource.h" // main symbols '`<Fys&:  
class CHookApp : public CWinApp #1*7eANfr  
{ O<|pw  
 public: 5wAKA`p"z  
  CHookApp(); ! N!pvK;  
  // Overrides ^ZS!1%1  
  // ClassWizard generated virtual function overrides @x!+_z  
  //{{AFX_VIRTUAL(CHookApp) ,H.5TQ#  
 public: k$f2i,7'  
  virtual BOOL InitInstance(); (dyY@={q  
  virtual int ExitInstance(); F(lJ  
  //}}AFX_VIRTUAL OXKV6r6f  
  //{{AFX_MSG(CHookApp) d)Z&_v<|  
  // NOTE - the ClassWizard will add and remove member functions here. W?kJ+1"(  
  // DO NOT EDIT what you see in these blocks of generated code ! OR $i,N|  
  //}}AFX_MSG )/Eu=+d  
  DECLARE_MESSAGE_MAP() q=`n3+N_H~  
}; #rr!A pJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 0J466H_d{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S#yGqN0i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a%kvC#B  
BOOL InitHotkey(); h*1T3U$  
BOOL UnInit(); R)SY#*Y  
#endif <z#Fj`2{  
-L6CEe  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. T2rBH]5  
#include "stdafx.h" iV#A-9  
#include "hook.h" [\h?mlG?  
#include <windowsx.h> PP!-*~F0Jr  
#ifdef _DEBUG A X1!<K  
#define new DEBUG_NEW ?fC9)s  
#undef THIS_FILE d8 Jf3Mo  
static char THIS_FILE[] = __FILE__; (.Ak*  
#endif  CDuA2e  
#define MAX_KEY 100 *pnaj\  
#define CTRLBIT 0x04 Uz rf,I[  
#define ALTBIT 0x02 6L\]Ee  
#define SHIFTBIT 0x01 t18j2P>`  
#pragma data_seg("shareddata") EVaHb;  
HHOOK hHook =NULL; K*,,j\Q.  
UINT nHookCount =0; ),Yk53G6c  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey P?|\Ig1Gk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT gzat!>*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey , #GB  
static int KeyCount =0; "zXrfn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {n|Uf 5  
#pragma data_seg() UmGKj9u  
HINSTANCE hins; Rmn{Vui9\  
void VerifyWindow(); r7?nHF  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) o37oRv]  
//{{AFX_MSG_MAP(CHookApp) Pn.DeoHme  
// NOTE - the ClassWizard will add and remove mapping macros here. u=]*,,5<  
// DO NOT EDIT what you see in these blocks of generated code! yk5K8D[tV  
//}}AFX_MSG_MAP < Mu`,Kv*  
END_MESSAGE_MAP() sSGXd=":  
7j=KiiI  
CHookApp::CHookApp() A:Gd F-;[  
{ 9c,/490Q  
 // TODO: add construction code here, =23@"ji@D  
 // Place all significant initialization in InitInstance <~w3[i=  
} 6P>}7R}  
=0PGE#d{t  
CHookApp theApp; w >2G@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I"3C/ pU2  
{ NR8`nc1~  
 BOOL bProcessed=FALSE; P3 =#<Q.  
 if(HC_ACTION==nCode) ZS]Z0iZv9  
 { a:HN#P)12  
  if((lParam&0xc0000000)==0xc0000000){// Key up mDbTOtD  
   switch(wParam) \.H9e/vU`  
   { Z^4+ 88  
    case VK_MENU: +O9x8OPHW  
     MaskBits&=~ALTBIT; ZbdGI@  
     break; >D~8iuy]8.  
    case VK_CONTROL: |%F4`gz8KP  
     MaskBits&=~CTRLBIT; 7D:rq 8$\  
     break; C^B$_?  
    case VK_SHIFT: +0Q +0:  
     MaskBits&=~SHIFTBIT; kb/BE J  
     break; #wRhR>6  
    default: //judge the key and send message _TsN%)m  
     break; 1t?OD_d!8  
   } GU@#\3  
   for(int index=0;index<MAX_KEY;index++){ cRbA+0m>  
    if(hCallWnd[index]==NULL) 39P55B/o%  
     continue; 2@z.ory.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Rj>A",  
    { tAJ}36 aG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q<z8P;oP^  
     bProcessed=TRUE; ~re}6-?  
    } }Kp<w,  
   } GQA\JYw|oY  
  } rrj.]^E_~  
  else if((lParam&0xc000ffff)==1){ //Key down ##xvuLy-6  
   switch(wParam) 3Os0<1@H  
   { t[X^4bZd  
    case VK_MENU: kAPSVTH$v  
     MaskBits|=ALTBIT; ?{`7W>G  
     break; A]i!131{w|  
    case VK_CONTROL: ]Z6? m  
     MaskBits|=CTRLBIT; S`FIb'J  
     break; v;;3 K*c>  
    case VK_SHIFT: %3#C0%{x  
     MaskBits|=SHIFTBIT; "Z,T%]  
     break; Avi_]h&  
    default: //judge the key and send message _<sN54  
     break; h\3-8m  
   } Y2.zT6i  
   for(int index=0;index<MAX_KEY;index++) eXK3W2XF  
   { Z^as ?k(iM  
    if(hCallWnd[index]==NULL) il !B={  
     continue; N_iy4W(NU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5<v1v&  
    { ^5TVm>F@3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M")/6PH8  
     bProcessed=TRUE; ,~ZD"'*n6g  
    } -PSgBH[  
   } ku]?"{Xx  
  } URbB2 Bi  
  if(!bProcessed){ kI@<H<  
   for(int index=0;index<MAX_KEY;index++){ IHd W!q  
    if(hCallWnd[index]==NULL) C:5d/9k  
     continue; K#X/j'$^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v)_FiY QQ6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QdQ1+*/+U  
   } Y.Z:H!P);$  
  } mS![J69(  
 } {xov8 M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #m?)XB^_  
} 5toa@#Bc%  
AL3iNkEa  
BOOL InitHotkey() t;h`nH[  
{ z5M6  
 if(hHook!=NULL){ -40X3  
  nHookCount++; HSRO gBNI:  
  return TRUE; HNBmq>XDc  
 } &b5(Su  
 else a oU"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W~D_+[P|_  
  if(hHook!=NULL) u|Mx}  
   nHookCount++; +D]raU  
  return (hHook!=NULL); [{u3g4`}  
} v7./u4S|V  
BOOL UnInit() LFHJj-nk  
{ zEW+1-=)+7  
 if(nHookCount>1){ $;q }j vo  
  nHookCount--; $VF,l#aR  
  return TRUE; [NO4Wzc  
 } r=Lgh#9S  
 BOOL unhooked = UnhookWindowsHookEx(hHook); LAxN?ok9gD  
 if(unhooked==TRUE){ OQ?N_zs,  
  nHookCount=0; 8^j~uH  
  hHook=NULL; j+ -r(lZ  
 } J({D~  
 return unhooked; YuknZ&Q  
} /R=MX>JA;  
r W[;3yMf  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eeCG#NFY5  
{ miQ*enZi  
 BOOL bAdded=FALSE; =NC??e{  
 for(int index=0;index<MAX_KEY;index++){ o|z@h][(l(  
  if(hCallWnd[index]==0){ ={oNY.(Q  
   hCallWnd[index]=hWnd; J$1H3#VV G  
   HotKey[index]=cKey; \b(&-=(  
   HotKeyMask[index]=cMask; ~KMah  
   bAdded=TRUE; E;C{i  
   KeyCount++; si6CWsb_f  
   break; yFDeY PZP  
  } Z)E)-2U$@  
 } ,jis@]:  
 return bAdded; =cjO]  
} ]Rxo}A  
X=]utn  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~r8<|$;  
{ 0@cIj ]  
 BOOL bRemoved=FALSE; pIcg+~  
 for(int index=0;index<MAX_KEY;index++){ T*C25l;w  
  if(hCallWnd[index]==hWnd){ 4y7_P0}:B  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ -]zb3P  
    hCallWnd[index]=NULL; nD*iSb*  
    HotKey[index]=0; uWdF7|PN7  
    HotKeyMask[index]=0; A<)n H=G&  
    bRemoved=TRUE; 65~E<)UJ  
    KeyCount--; 3[fm| aU  
    break; eP>_CrJb  
   } >;c);|'}q  
  } [q[37;ZEQ  
 } g_syGQ\  
 return bRemoved; ={P`Tve  
} [ZSC]w^  
$]E+E.P  
void VerifyWindow() g[pU5%|"[  
{ -\?-  
 for(int i=0;i<MAX_KEY;i++){ xWzybuLp  
  if(hCallWnd!=NULL){ fIQ, }>  
   if(!IsWindow(hCallWnd)){ 66eJp-5e8  
    hCallWnd=NULL; K}@rte  
    HotKey=0; r]p3DQ  
    HotKeyMask=0; 8N'hG,  
    KeyCount--; Q NMZR  
   } <>\|hno}  
  } `Fr ,,Q81\  
 } -GPBX?  
} iG6]Pr|;e  
{HEWU<5  
BOOL CHookApp::InitInstance() R~oJ-} iYX  
{ IXa~,a H71  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *2a"2o  
 hins=AfxGetInstanceHandle(); l6HtZ(  
 InitHotkey(); ekyCZ8iai  
 return CWinApp::InitInstance(); 4}; @QFT*  
} (cLKhn@  
&]n }fq  
int CHookApp::ExitInstance() ,6g{-r-2  
{ %[*-aA  
 VerifyWindow(); 0@zJa;z'  
 UnInit(); ?(=|!`IoO  
 return CWinApp::ExitInstance(); :gwmk9LZ  
} KZ7B2  
?tjEXg>ny  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2w7$"N  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3O$l;|SX  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `Uz.9_6  
#if _MSC_VER > 1000 ~3:hed7:  
#pragma once YTefEG]|q  
#endif // _MSC_VER > 1000 #  `E  
}?Y -I> w  
class CCaptureDlg : public CDialog iptA#<Yj  
{ L!Y|`P#Yr  
 // Construction Ln,<|,fZN  
 public: X^eyrqv  
  BOOL bTray; Ljz)%y[s  
  BOOL bRegistered; ,nteIR'??  
  BOOL RegisterHotkey(); (v/L   
  UCHAR cKey; <pb  
  UCHAR cMask; 5 [~HL_u;,  
  void DeleteIcon(); (]'wQ4iQ  
  void AddIcon(); tB>!1}v  
  UINT nCount; z]8Mv(eL  
  void SaveBmp(); s|<n7 =J  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^aAs=KditO  
  // Dialog Data x!GDS>  
  //{{AFX_DATA(CCaptureDlg) g3kbsi7_:  
  enum { IDD = IDD_CAPTURE_DIALOG }; Gpxp8[ {  
  CComboBox m_Key; U!|)M  
  BOOL m_bControl; lot`6]  
  BOOL m_bAlt; @ ,X/Wf  
  BOOL m_bShift; ZzE(S  
  CString m_Path; lF(v<drkB  
  CString m_Number; }XBF#BN  
  //}}AFX_DATA Qt4mg?X/  
  // ClassWizard generated virtual function overrides qWr=Oiu  
  //{{AFX_VIRTUAL(CCaptureDlg) _)5E=  
 public: ?fy37m(M}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )b1hF  
 protected: O oA!N-Q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t!rrYBSCr  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -r cEG!  
  //}}AFX_VIRTUAL E6~VHQa2?  
  // Implementation }~@/r5Zl  
 protected: Lf%3-P  
  HICON m_hIcon; n^[a}DX0  
  // Generated message map functions a%`Yz"<lQ  
  //{{AFX_MSG(CCaptureDlg) ^x O](,H  
  virtual BOOL OnInitDialog(); Y[7prjd  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); H[KX xNYZ_  
  afx_msg void OnPaint(); tP|/Q 5s  
  afx_msg HCURSOR OnQueryDragIcon(); Gn 9oInY1  
  virtual void OnCancel(); eWv:wNouk  
  afx_msg void OnAbout(); QoxYzln  
  afx_msg void OnBrowse(); Wd;t(5Xl  
  afx_msg void OnChange(); h623)C;  
 //}}AFX_MSG MS""-zn<  
 DECLARE_MESSAGE_MAP() %^lD  
}; Gf.ywqE$Y$  
#endif 72~L  ?  
F*U(Wl=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file }b54O\,  
#include "stdafx.h" OlyW/hd  
#include "Capture.h" ~F-knEvL  
#include "CaptureDlg.h" F?2UHcs  
#include <windowsx.h> 0a:oC(Ak  
#pragma comment(lib,"hook.lib") `:3nF'  
#ifdef _DEBUG "G>d8GbIh  
#define new DEBUG_NEW {ax]t-ZwJ5  
#undef THIS_FILE r*b+kSh  
static char THIS_FILE[] = __FILE__; 9RlJf=Z#H  
#endif afX|R  
#define IDM_SHELL WM_USER+1 ((]i}s0S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [(*Eg!?W=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y(6ev o&IR  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; P,] ./m\J  
class CAboutDlg : public CDialog &Pme4IHtm  
{ ~vDa2D<9%  
 public: {c)\}s(}F  
  CAboutDlg(); V $I8iVGL  
  // Dialog Data %( 7##f_  
  //{{AFX_DATA(CAboutDlg) )I*(yUj  
  enum { IDD = IDD_ABOUTBOX }; !%65YTxY-  
  //}}AFX_DATA LI.WcI3uS  
  // ClassWizard generated virtual function overrides 1#3|PA#>  
  //{{AFX_VIRTUAL(CAboutDlg) wyX3qH  
 protected: =At" Q6-O  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %R?7u'=~  
  //}}AFX_VIRTUAL QErdjjg E  
  // Implementation \9`E17i  
 protected: 7Q|<6210  
  //{{AFX_MSG(CAboutDlg) :8O T  
  //}}AFX_MSG 8:c=h/fa  
  DECLARE_MESSAGE_MAP() v zs4tkG  
}; fWJpy#/^*K  
OcV,pJ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) eef&ZL6g  
{ t!3s@  
 //{{AFX_DATA_INIT(CAboutDlg) O#;sY`fy_M  
 //}}AFX_DATA_INIT A{\?]]/  
} X>`03?L  
C)j/!+nh  
void CAboutDlg::DoDataExchange(CDataExchange* pDX)  I\_2=mL  
{ (8m_GfT  
 CDialog::DoDataExchange(pDX); ( gg )?  
 //{{AFX_DATA_MAP(CAboutDlg) 4r4 #u'Om  
 //}}AFX_DATA_MAP T5T%[Gv  
} a6 vej  
_ab8z]H   
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) iwM xTty  
 //{{AFX_MSG_MAP(CAboutDlg) A'`F Rx(  
 // No message handlers =| T^)J  
 //}}AFX_MSG_MAP mOj; 0 R  
END_MESSAGE_MAP() :AlvWf$d  
!dwZ`D  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P6kD tUXF  
: CDialog(CCaptureDlg::IDD, pParent) h=`$ec  
{ kP$ E+L  
 //{{AFX_DATA_INIT(CCaptureDlg) ',g%L_8Sq  
  m_bControl = FALSE; o3+s.7 "  
  m_bAlt = FALSE; rP]|`*B  
  m_bShift = FALSE; _D}3``  
  m_Path = _T("c:\\"); 4o M~  
  m_Number = _T("0 picture captured."); Lqxh y s  
  nCount=0; OF`J{`{r  
  bRegistered=FALSE; xz0t8`N oN  
  bTray=FALSE; c=+%][21  
 //}}AFX_DATA_INIT V~*>/2+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (U# ,;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fx+_;y  
} KF#^MEw%  
I1m[M?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @P~%4:!Hr  
{ dQSO8Jf  
 CDialog::DoDataExchange(pDX); Pa0W|q#?X  
 //{{AFX_DATA_MAP(CCaptureDlg) >ye.rRZd`  
  DDX_Control(pDX, IDC_KEY, m_Key); M`K]g&57hL  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); mW!n%f  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <eMqg u  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); V-#JV@b  
  DDX_Text(pDX, IDC_PATH, m_Path); >vo 6X]p~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rfVQX<95=/  
 //}}AFX_DATA_MAP |dEPy- Xe  
} o_Z9\'u  
ZqrS]i@$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,gNZHKNq  
//{{AFX_MSG_MAP(CCaptureDlg) *#>(P  
 ON_WM_SYSCOMMAND() xltN-<n7  
 ON_WM_PAINT() A z@@0  
 ON_WM_QUERYDRAGICON() ]QR]#[Tn'  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) QAx9W%  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xP~GpVhLF  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ds+K7B$  
//}}AFX_MSG_MAP \( V1-,  
END_MESSAGE_MAP() I,#E`)  
ZKrK >X  
BOOL CCaptureDlg::OnInitDialog() \?t8[N\_[(  
{ @` Pn<_L  
 CDialog::OnInitDialog(); `lE&:)  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =(hBgNH  
 ASSERT(IDM_ABOUTBOX < 0xF000); mD7NQ2:wA  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `AE6s.p?  
 if (pSysMenu != NULL) \^,Jh|T  
 { >;Oa|G  
  CString strAboutMenu; C)FO:lLr\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @C@9Tw2Y  
  if (!strAboutMenu.IsEmpty()) lz>00B<Z  
  { Bj4c_YBte  
   pSysMenu->AppendMenu(MF_SEPARATOR); vkJyD/;=  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `:7r5}(^  
  } W=A0+t%XC  
 } e@V J-s  
 SetIcon(m_hIcon, TRUE); // Set big icon |DW^bv  
 SetIcon(m_hIcon, FALSE); // Set small icon BMO,eQcB  
 m_Key.SetCurSel(0); jt}oq%Bf  
 RegisterHotkey(); @1'OuX^  
 CMenu* pMenu=GetSystemMenu(FALSE); VtzZ1/J E  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &TRKd)wd  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); pD[&,gV$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~SBW`=aP}  
 return TRUE; // return TRUE unless you set the focus to a control 9;XbyA]  
} MVzj7~+  
gYN;F u-9Z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) XGR63hXND  
{ KB~1]cYMp  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 16eP7s  
 { [dLc+h1{B  
  CAboutDlg dlgAbout; `:Wyw<^  
  dlgAbout.DoModal();  mY"Dw^)  
 } 6{i0i9Tb  
 else u,iiS4'Ze  
 { "JmbYb#Z  
  CDialog::OnSysCommand(nID, lParam); [V_mF  
 } >CKa?N;  
} :CM-I_6  
9$v\D3<Z  
void CCaptureDlg::OnPaint() *-]k([wV  
{ i| cA)  
 if (IsIconic()) |%8t.Z  
 { 2u_=i$xW  
  CPaintDC dc(this); // device context for painting gYbvCs8O!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); _5n2'\] H`  
  // Center icon in client rectangle FEhBhv|m  
  int cxIcon = GetSystemMetrics(SM_CXICON); rMWvW(@@D  
  int cyIcon = GetSystemMetrics(SM_CYICON); o/,%rA4  
  CRect rect; PT,*KYF_O"  
  GetClientRect(&rect); ,e$RvFB  
  int x = (rect.Width() - cxIcon + 1) / 2; < hy!B4  
  int y = (rect.Height() - cyIcon + 1) / 2; 8bMw.u=F  
  // Draw the icon m8L %!6o  
  dc.DrawIcon(x, y, m_hIcon); \4$Nx/@Q}  
 } ?~.9: 93  
 else l]DRJ  
 { oIOeX1$V  
  CDialog::OnPaint(); B> i^w1  
 } N%:uOX8{  
} 7.NL>:lu  
kKbbsB  
HCURSOR CCaptureDlg::OnQueryDragIcon() H4v%$R;K  
{ `4@` G:6BL  
 return (HCURSOR) m_hIcon; :, H_ e! X  
} .Sw4{m[g  
</<z7V,{  
void CCaptureDlg::OnCancel() n@@tO#!\  
{ tZ=|1lM  
 if(bTray) ^{yb4yQ 0  
  DeleteIcon(); P/~dY  
  CDialog::OnCancel(); 5r8 [ "  
} |#*+#27  
4ybOK~z  
void CCaptureDlg::OnAbout() HSG9|}$  
{ #F .8x@  
 CAboutDlg dlg; jc6~V$3  
 dlg.DoModal(); Gg6cjc=dC  
} \K9Y@jnr  
coaJDg+  
void CCaptureDlg::OnBrowse() 7m8:odeF  
{ 6"?#s/fk  
 CString str; RToX[R;1E  
 BROWSEINFO bi; Np9Pae'  
 char name[MAX_PATH]; _mdJIa0D6k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); c?xeBC1-  
 bi.hwndOwner=GetSafeHwnd(); D//58z&  
 bi.pszDisplayName=name; ZQz;EV!  
 bi.lpszTitle="Select folder"; {XhpxJ__  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )}w-;HX  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 2s 9U&  
 if(idl==NULL) 'uUa|J1mu  
  return; 0x'Fi2=`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $3#oA.~R/  
 str.ReleaseBuffer(); ~U?vB((j!  
 m_Path=str; u_WW uo  
 if(str.GetAt(str.GetLength()-1)!='\\') NFIFCy!  
  m_Path+="\\"; 3kJSz-_M  
 UpdateData(FALSE); T^ xp2cZ  
} H'EBe;ccM  
=8r,-3lC;  
void CCaptureDlg::SaveBmp() 5hCfi  
{ mn<ea&  
 CDC dc; *LmzGF|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); U_B`SS  
 CBitmap bm; A^c5CJ_  
 int Width=GetSystemMetrics(SM_CXSCREEN); ; zy;M5l5.  
 int Height=GetSystemMetrics(SM_CYSCREEN); _x#r,1V+D  
 bm.CreateCompatibleBitmap(&dc,Width,Height); b[;3y/X  
 CDC tdc; dj0D u^ v4  
 tdc.CreateCompatibleDC(&dc); t.O4-+$ig  
 CBitmap*pOld=tdc.SelectObject(&bm); SR)@'-Wd  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); lgAE`Os  
 tdc.SelectObject(pOld); W\DJXM]b  
 BITMAP btm; &zP\K~Nt  
 bm.GetBitmap(&btm); oDA'}[/  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; !q PUQ+  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  [7)#3  
 BITMAPINFOHEADER bih; zgpPu4t  
 bih.biBitCount=btm.bmBitsPixel; VKrKA71Z~  
 bih.biClrImportant=0; 9>@"W-  
 bih.biClrUsed=0; C$B?|oUJc  
 bih.biCompression=0; ;#"`]khd  
 bih.biHeight=btm.bmHeight; Xg"Mjmr  
 bih.biPlanes=1; LyXABQ]  
 bih.biSize=sizeof(BITMAPINFOHEADER); gwF@'Uu  
 bih.biSizeImage=size; !lB,2_  
 bih.biWidth=btm.bmWidth; q%^gG03.  
 bih.biXPelsPerMeter=0; }W%}_UT  
 bih.biYPelsPerMeter=0; U(qM( E  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); L' h'm{i  
 static int filecount=0; {la ^useg[  
 CString name; t! Av [K  
 name.Format("pict%04d.bmp",filecount++); *KV] MdS  
 name=m_Path+name; qdu:kA:]  
 BITMAPFILEHEADER bfh; 1-gX=8]]  
 bfh.bfReserved1=bfh.bfReserved2=0; C{S6Ri  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ln!KL'T]  
 bfh.bfSize=54+size; }mJ)gK5b 6  
 bfh.bfOffBits=54; ae1fCw3k  
 CFile bf; ]R]X#jm  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ')FNudsC  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); PwNLJj+%  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); X!_OOfueP8  
  bf.WriteHuge(lpData,size); Kd,m;S\  
  bf.Close(); XJOo.Y  
  nCount++; anV)$PT=  
 } /ci.IT$Q^  
 GlobalFreePtr(lpData); g-(xuR^*  
 if(nCount==1) G6Fg<g9:  
  m_Number.Format("%d picture captured.",nCount); )5V1H WjU  
 else C ILk  
  m_Number.Format("%d pictures captured.",nCount); IX3U\_I#  
  UpdateData(FALSE); x[oYN9O  
} T@ HozZ  
#QDV_ziE5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) XJ NKM~  
{ ,wEM  
 if(pMsg -> message == WM_KEYDOWN) {k]VT4/  
 { W]*wxzf!5z  
  if(pMsg -> wParam == VK_ESCAPE) & ='uAw  
   return TRUE; K|1^?#n  
  if(pMsg -> wParam == VK_RETURN) < ?nr"V  
   return TRUE; Vis?cuU/  
 } E0h!%/+-L  
 return CDialog::PreTranslateMessage(pMsg); kI;^V  
} WK^qYfq|  
Tp6ysjao  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) },L[bDOV07  
{ f!I e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t[ MRyi)LF  
  SaveBmp(); ?^+|V,<  
  return FALSE; q B 2#EsZ  
} 1Q$ M/}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ MR6vr.~  
 CMenu pop;  JuI,wA  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?8nG F%p  
 CMenu*pMenu=pop.GetSubMenu(0); Zj^H3 h  
 pMenu->SetDefaultItem(ID_EXITICON); Ek. j@79  
 CPoint pt; J8D-a!  
 GetCursorPos(&pt); QBo^{],  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <z4!m/f [(  
 if(id==ID_EXITICON) *ZEs5`x  
  DeleteIcon(); zj)[Sn tn?  
 else if(id==ID_EXIT) DpR%s",Q  
  OnCancel(); i! nl%%  
 return FALSE; %?$"oWmenS  
} JZ7-? o  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n C Z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Fy@D&j  
 AddIcon(); d$Xvax,C  
 return res; ljCgIfZ_4  
} w/<hyEpxg  
n#fg7d%  
void CCaptureDlg::AddIcon() 0?sp  
{ Aws TDM  
 NOTIFYICONDATA data; Y#5S;?bR  
 data.cbSize=sizeof(NOTIFYICONDATA); ]_,~q@r$  
 CString tip; *]=)mM#  
 tip.LoadString(IDS_ICONTIP); m ;vNA  
 data.hIcon=GetIcon(0); Vqr&)i"b$  
 data.hWnd=GetSafeHwnd(); eyWwE%  
 strcpy(data.szTip,tip); DQ}]'*@?  
 data.uCallbackMessage=IDM_SHELL; iB`m!g6$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *dl@)~i  
 data.uID=98; ,O+7nByi[V  
 Shell_NotifyIcon(NIM_ADD,&data); mB~&nDU  
 ShowWindow(SW_HIDE); PrcM'Q  
 bTray=TRUE; $p@g#3X`  
} yC5|"+ A$  
4c yv 8  
void CCaptureDlg::DeleteIcon() 5%$#3LT|  
{ 3WY W])  
 NOTIFYICONDATA data; m}E$6E^~O  
 data.cbSize=sizeof(NOTIFYICONDATA); koU.`l.  
 data.hWnd=GetSafeHwnd(); td~3N,S  
 data.uID=98; #]'xUgcE9  
 Shell_NotifyIcon(NIM_DELETE,&data); g/J!U8W"  
 ShowWindow(SW_SHOW); @wPmx*SF  
 SetForegroundWindow(); zkOgL9 (_8  
 ShowWindow(SW_SHOWNORMAL); 73.b9mF  
 bTray=FALSE; m~K]|]iqQ  
} zl[JnVF\6  
CAA~VEUL  
void CCaptureDlg::OnChange() L5W>in5(  
{ XTJ>y@  
 RegisterHotkey(); vX\e* v  
} GS H{1VS_b  
>A/=eW/q  
BOOL CCaptureDlg::RegisterHotkey() (r4\dp&  
{ ;z>YwRV  
 UpdateData(); on\\;V_/Q  
 UCHAR mask=0; >R<fm  
 UCHAR key=0; 5dk,!Cjg  
 if(m_bControl) e{,/  
  mask|=4; mI%/k7:sf  
 if(m_bAlt) NsHveOK1.  
  mask|=2; DvCt^O*  
 if(m_bShift) /WfxI>v  
  mask|=1; vo-{3]u#=  
  key=Key_Table[m_Key.GetCurSel()]; ||=Duk  
 if(bRegistered){ Ln|${c  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1^3#3duV  
  bRegistered=FALSE; S8VR#  
 } i.]zq  
 cMask=mask; 'Ot[q^,KRG  
 cKey=key; l?o- p  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); EiUV?Gvz  
 return bRegistered; P$Q&xN<#)  
} ~aG-^BAS  
(Nahtx!/9  
  四、小结 jHCKV  
 |_ *$+  
  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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