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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: |21hY  
  *^+xcG  
  一、实现方法 [5eT|uy  
Hh;6B!zb+  
  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: v_h*:c  
:;WDPRx  
#pragma data_seg("shareddata") Eg29|)qsz  
HHOOK hHook =NULL; //钩子句柄 5YH mp7c-z  
UINT nHookCount =0; //挂接的程序数目 wVJFA1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ahbu >LPk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 J+NK+,_*M  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Ry S{@=si  
static int KeyCount =0; @d^h/w  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (4f9wrK  
#pragma data_seg() "3oU (RA  
MV d 3*  
  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。 :@Dos'0Px  
'I>#0VRr  
  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: :Sn3|`HDm  
FY S83uq0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [=F |^KL  
cKey,UCHAR cMask) Jo$Dxa z  
{ ;/q6^Nk3A  
 BOOL bAdded=FALSE; 6%INNIyAWa  
 for(int index=0;index<MAX_KEY;index++){ }Q^a.`h  
  if(hCallWnd[index]==0){ +mOtYf W  
   hCallWnd[index]=hWnd; [IBk-opap  
   HotKey[index]=cKey; KL"L65g&  
   HotKeyMask[index]=cMask; GiwA$^Hg\  
   bAdded=TRUE; _1c_TMh}9  
   KeyCount++; *`.{K12T  
   break; 5g>kr< K  
  } p}7&x[fTLk  
 } P}QbxkS 8  
 return bAdded; PM>XT  
} AHD%6 \$  
//删除热键 W*`6ero  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) pDq_nx9  
{ TPFmSDq  
 BOOL bRemoved=FALSE; "$pg mf2  
 for(int index=0;index<MAX_KEY;index++){ U?j>28  
  if(hCallWnd[index]==hWnd){ K.1yncS^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ slfVQ809  
    hCallWnd[index]=NULL; *Y0,d`  
    HotKey[index]=0; <1.mm_pw  
    HotKeyMask[index]=0; -%) !XB  
    bRemoved=TRUE; ;O|63  
    KeyCount--; 2B dr#qr  
    break; `2+e\%f/0  
   } |6^ K  
  } K61os&K  
 } N4jLbnA  
 return bRemoved; 1W<_5 j_  
} R >&/n/l  
M F: Eu  
0w. _}C z  
  DLL中的钩子函数如下: {~I_rlo n  
 " 1Aus  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8mLU ~P |  
{ 4PM`hc  
 BOOL bProcessed=FALSE; qJt gnk|  
 if(HC_ACTION==nCode) ZUW>{'[K  
 { JHH&@Cn  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 T=dvc}  
   switch(wParam) ScoHtX3  
   {  oz@6%3+  
    case VK_MENU: !r0P\  
     MaskBits&=~ALTBIT; zRFM/IYC  
     break; z5vI0 N$  
    case VK_CONTROL: V <pjR@  
     MaskBits&=~CTRLBIT; pPp nO  
     break; {K8T5zrV  
    case VK_SHIFT: -V/i%_+Ze  
     MaskBits&=~SHIFTBIT; (k&aD2PH  
     break; 0*@S-Lj^c  
    default: //judge the key and send message D+""o"%  
     break; 5K~6`  
   } Ib2pV2`h(  
   for(int index=0;index<MAX_KEY;index++){ |R/50axI  
    if(hCallWnd[index]==NULL) (SA*9%  
     continue; L]<4{8H.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) TJ:Lz]l >  
    { UdJV;T'rm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |h/2'zd^-  
     bProcessed=TRUE; :q1r2&ne  
    } $7d"9s\$"  
   } TL gVuY  
  } p n>`v   
  else if((lParam&0xc000ffff)==1){ //有键按下 R,1,4XT  
   switch(wParam) 6|}mTG^  
   { b.;}Hq>  
    case VK_MENU: .p>8oOp  
     MaskBits|=ALTBIT; .y+U7 "?s*  
     break; ),,vu  
    case VK_CONTROL: 5-^twXC&  
     MaskBits|=CTRLBIT; epyfgg MT  
     break;  c @fc7  
    case VK_SHIFT: <-}\V!@E!  
     MaskBits|=SHIFTBIT; C ,hsr  
     break; vrbh+  
    default: //judge the key and send message ;D:T ^4  
     break; }*.*{I  
   } 1PSb72h<  
   for(int index=0;index<MAX_KEY;index++){ >.\E'e5^C  
    if(hCallWnd[index]==NULL) PM7/fv*,  
     continue; q|J]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \/v$$1p2  
    { --kK<9J7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); sKO ;p  
     bProcessed=TRUE; )zo ;r!eP  
    } I#U44+c  
   } : 6V 8  
  } Q>$L;1E*,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 kM`#U *j  
   for(int index=0;index<MAX_KEY;index++){ 9l]IE,u  
    if(hCallWnd[index]==NULL) 3(5Y-.aK}^  
     continue; uL F55:`<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oVW?d]R  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e_V(G  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p;Kr664  
   } qE{S'XyM,  
  } PK" C+o;:  
 } 'zK*?= ^jk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q =6 Y2Q  
} 7i.aZ2a%  
@jKB!z9{  
  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: (.o'1 '  
?f..N,s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f6 nltZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6! 'Xo:p  
fZ$2bI=  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: n} {cs  
_8 J (;7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }q9f,mz  
{ }R$%MU5::  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) plfB} p  
 { I2'?~Lt  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 QUf_fe!,|  
  SaveBmp(); gp=0;#4 4  
  return FALSE; 'Iu(lpF&  
 } *OiHrI9y  
 …… //其它处理及默认处理 0 i"OG( ,  
} O5 SX"A  
?*,q#ZkA9W  
v(`$%V.  
  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。 ?9+;[X  
2uIAnbW]M  
  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。 z@~rm9d  
zdCt#=QV?R  
  二、编程步骤 :Kiu*&{  
CR<l"~X  
  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"; 2dfA}i>k  
h%%'{^>~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; D#0}/  
EcU9Tm`h  
  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; wal }[F#  
71_N9ub@z  
  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; q9Q4F  
Rs wR DLl  
  5、 添加代码,编译运行程序。 <vs.Ucxx  
F <(Y  
三、程序代码 kel48B  
U*cj'`eqC  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1a<~Rmcil  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 2 O%UT?R  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6k2~j j1d  
#if _MSC_VER > 1000 #7{a~-S  
#pragma once w]_a0{Uh  
#endif // _MSC_VER > 1000 *RPI$0  
#ifndef __AFXWIN_H__ zw?6E8$h  
#error include 'stdafx.h' before including this file for PCH M4| L  
#endif Sc&_6} K  
#include "resource.h" // main symbols S:gP\Atf>  
class CHookApp : public CWinApp r_G`#Z_5F  
{ !SnpesTn  
 public: tBrVg<]t  
  CHookApp(); F~EriO  
  // Overrides k.%F!sK  
  // ClassWizard generated virtual function overrides PyYe>a;.  
  //{{AFX_VIRTUAL(CHookApp) Z_%>yqDC  
 public: H,'c&  
  virtual BOOL InitInstance(); ]P.S5s'  
  virtual int ExitInstance(); *h Ur E  
  //}}AFX_VIRTUAL 8QU`SoS9  
  //{{AFX_MSG(CHookApp)  l}JVRU{  
  // NOTE - the ClassWizard will add and remove member functions here. ~0L>l J  
  // DO NOT EDIT what you see in these blocks of generated code ! E%TvGe;#  
  //}}AFX_MSG b> | oU  
  DECLARE_MESSAGE_MAP() -Db(  
}; @ o]F~x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); c c:xT0Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \gdd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z,*VRuA  
BOOL InitHotkey(); ; ?!sU  
BOOL UnInit(); q6q= ,<T%S  
#endif 7 UR)4dYA  
`g7' )MSy  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. q07>FW R  
#include "stdafx.h" ;RXv%ML  
#include "hook.h" [yz;OoA:;  
#include <windowsx.h> m9/a!|fBE  
#ifdef _DEBUG a.P^+h  
#define new DEBUG_NEW H_9~gi  
#undef THIS_FILE tZJKB1#WbP  
static char THIS_FILE[] = __FILE__; 1*Z}M%  
#endif .$Y[>9  
#define MAX_KEY 100 B6BOy~B0  
#define CTRLBIT 0x04 QFMS]  
#define ALTBIT 0x02 b+kb7  
#define SHIFTBIT 0x01 X:YxsZQ 5Y  
#pragma data_seg("shareddata") Z=#!FZ{  
HHOOK hHook =NULL; q;rU}hAzG0  
UINT nHookCount =0; k,2% %m  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _v-sb(* J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT epQ7@9,Q  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey GFvOrRlP\  
static int KeyCount =0;  M`bK   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1UOFTI2S|  
#pragma data_seg() ;I9D>shkc  
HINSTANCE hins; dG1qrh9_-  
void VerifyWindow(); O?P6rXKr  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) cB|](gWS~  
//{{AFX_MSG_MAP(CHookApp)  ST{<G  
// NOTE - the ClassWizard will add and remove mapping macros here. 1_A< nt?'R  
// DO NOT EDIT what you see in these blocks of generated code! nF=h|rN  
//}}AFX_MSG_MAP "F=O   
END_MESSAGE_MAP() Zvc{o8^z  
.^/OL}/~<  
CHookApp::CHookApp() (u *-(  
{ @hk~8y]rz  
 // TODO: add construction code here, TtHqdKL  
 // Place all significant initialization in InitInstance ;%Qu;FtC  
} B7cXbUAQs  
i),W1<A1  
CHookApp theApp; }psJ'aiG*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |@Bl?Bs+  
{ $cjidBi`):  
 BOOL bProcessed=FALSE; Y6+nfh_  
 if(HC_ACTION==nCode) 9mr99 tA  
 { (R{W Jjj  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8!1vsEqv  
   switch(wParam) <~'\~Zd+  
   { WUKYwA/t  
    case VK_MENU: $P>ci4]t  
     MaskBits&=~ALTBIT; 4~D?F'o  
     break; EiSS_Lc  
    case VK_CONTROL:  IG 6yt  
     MaskBits&=~CTRLBIT; O",:0<  
     break; LEG y1L  
    case VK_SHIFT: 0m!+gZ@  
     MaskBits&=~SHIFTBIT; N\rbnr  
     break; _8S!w>$)  
    default: //judge the key and send message NeQ/#[~g  
     break; 0:Xvch0  
   } >A#]60w.  
   for(int index=0;index<MAX_KEY;index++){ @jX[Ho0W'  
    if(hCallWnd[index]==NULL) !M6*A1g5  
     continue; S-GcH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &;|/I`+  
    { LJ9^:U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XB zcbS+  
     bProcessed=TRUE; (z#qkKL{^  
    } y^?7de}  
   } ,@Xl?  
  } p1q"[)WVn^  
  else if((lParam&0xc000ffff)==1){ //Key down nKT\/}d  
   switch(wParam) l@%MS\{  
   { Ap=L lZ  
    case VK_MENU: uD_iyK0,  
     MaskBits|=ALTBIT; UO>ADRs}  
     break; m!V ?xGKJ  
    case VK_CONTROL: d[J+):aW  
     MaskBits|=CTRLBIT; uPhFBD7  
     break; :>]= YE  
    case VK_SHIFT: -r7*C :E  
     MaskBits|=SHIFTBIT; /{6PwlP5  
     break; P-.>vi^+  
    default: //judge the key and send message 7' ]n_-fu  
     break; 8i;EpAwB  
   } j@ lHgis  
   for(int index=0;index<MAX_KEY;index++) f.4r'^  
   { 2Gd.B/L6  
    if(hCallWnd[index]==NULL) 'gI q_t|^  
     continue; oSq4g{xvMH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "k[-eFz/@M  
    { . _Bejh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E9i M-Lw  
     bProcessed=TRUE; 1YL6:5n  
    } Yxp.`  
   } QX-%<@  
  } x4Q*~,n  
  if(!bProcessed){ 9KkxUEkW  
   for(int index=0;index<MAX_KEY;index++){ ci a'h_w  
    if(hCallWnd[index]==NULL) 9Ra*bP ]1  
     continue; nep0<&"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V4PI~"4q#1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); hCS|(8g  
   } g1UP/hNJ\8  
  } e0Zwhz,  
 } Iy% fg',%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); L )p*D(  
} kZ~0fw-  
.SzP ig  
BOOL InitHotkey() ',$Uw|N  
{ 5[suwaJQ  
 if(hHook!=NULL){ L|A}A[P  
  nHookCount++; c6VfFt6p  
  return TRUE; FxeDjAP  
 } ]?tC+UKb  
 else N8S !&*m  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 9.)*z-f$  
  if(hHook!=NULL) Z]OXitt7  
   nHookCount++; Myaj81  
  return (hHook!=NULL); o_R<7o/d|  
} 7L)edR [  
BOOL UnInit() Oh)s"f\N  
{ (xxNQ] l-(  
 if(nHookCount>1){ vkUXMMuf+e  
  nHookCount--; T%zCAfx m  
  return TRUE; >U .  
 } Ad$CHx-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7/C,<$Ep  
 if(unhooked==TRUE){ /Y| y0iK  
  nHookCount=0; lOB*M!8   
  hHook=NULL; ,41Z_h  
 } wiHGTaR  
 return unhooked; >v--R8I*  
} $v5)d J  
@/jLN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) nIc:<w]  
{ ?'SHt9b3|  
 BOOL bAdded=FALSE; NX.%Rj*  
 for(int index=0;index<MAX_KEY;index++){ EC#4"bU`'2  
  if(hCallWnd[index]==0){ ,6T F]6:  
   hCallWnd[index]=hWnd; (OS -v~{r@  
   HotKey[index]=cKey; /6S% h-#\  
   HotKeyMask[index]=cMask; i;Y3pF0%P  
   bAdded=TRUE; WRIOjQ:  
   KeyCount++; ]$Ud`<Xnx  
   break; yR}PC/>  
  } Y%$@ZYW  
 } GY% ^!r  
 return bAdded; v|~&I%S7  
} ygI81\ D  
rFn%e  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z8mSm[w  
{ "MS}@NLUW  
 BOOL bRemoved=FALSE; y-C=_v_X  
 for(int index=0;index<MAX_KEY;index++){ $U . >]i  
  if(hCallWnd[index]==hWnd){ 9rD6."G  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3X|7 R  
    hCallWnd[index]=NULL; j:k}6]p}  
    HotKey[index]=0; f[r?J/;P9  
    HotKeyMask[index]=0; F/8="dM  
    bRemoved=TRUE; +ftOJFkI  
    KeyCount--; Hg[g{A_G[  
    break; NWL\"xp `t  
   } 1=o|[7  
  } `wGP31Y.  
 } ,^Ug[pGG-  
 return bRemoved; Q#gzk%jL@  
} '2LK(uaU  
0 $Ygt0d  
void VerifyWindow() "p Rr>Fa  
{ 8nV#\J9  
 for(int i=0;i<MAX_KEY;i++){  x&^>|'H  
  if(hCallWnd!=NULL){ *,x-}%X  
   if(!IsWindow(hCallWnd)){ EuH[G_5e0  
    hCallWnd=NULL; MawWgd*  
    HotKey=0; XHN*'@ 77;  
    HotKeyMask=0; $!Qv f  
    KeyCount--; WF#3'"I  
   } yZHh@W4v  
  } >{ /As][  
 } lRO7 Ae  
} %KjvV<f-a  
p-CBsm5P  
BOOL CHookApp::InitInstance() \}:RG^*m  
{ O8\>?4)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); -9D2aY_>  
 hins=AfxGetInstanceHandle(); c>~q2_} W(  
 InitHotkey(); E8gbm&x*  
 return CWinApp::InitInstance(); uDe%M  
} . W7Z pV  
H0dHW;U<1  
int CHookApp::ExitInstance() U<|hIv-&  
{ KzgW+6*G  
 VerifyWindow(); dx.,  
 UnInit(); f52*s#4}  
 return CWinApp::ExitInstance(); Ng Jp2ut  
} hwD;1n  
6cQ)*,Q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "J.7@\^ h/  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) T> < Vw  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q85Y6',  
#if _MSC_VER > 1000 [\_#n5  
#pragma once 'L k& iph  
#endif // _MSC_VER > 1000 n "J+? ~9  
%@q/OVnM  
class CCaptureDlg : public CDialog M94zlW<  
{ J 7/)XS  
 // Construction Q$`u=-h|  
 public: \gU=B|W  
  BOOL bTray; s3Wjg  
  BOOL bRegistered; 0`H)c) pP  
  BOOL RegisterHotkey(); s:p6oEQ=J  
  UCHAR cKey; kO)+%'L!8  
  UCHAR cMask; W]TO%x{  
  void DeleteIcon(); $ap6Vxjr  
  void AddIcon(); HNMVs]/e  
  UINT nCount; P&g.%8b~84  
  void SaveBmp(); n1E^8[~'  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor r.~^h^c]  
  // Dialog Data L/+KY_b:*  
  //{{AFX_DATA(CCaptureDlg) KD(}-zUs  
  enum { IDD = IDD_CAPTURE_DIALOG }; zZh\e,*  
  CComboBox m_Key; 3W#f Fy  
  BOOL m_bControl; "TQ3{=j{  
  BOOL m_bAlt; *z3wm-z1&  
  BOOL m_bShift; _oU}>5  
  CString m_Path; cs\/6gSCo  
  CString m_Number; 5h!ZoB)n  
  //}}AFX_DATA WF&?OHf2  
  // ClassWizard generated virtual function overrides n7$2 1*,  
  //{{AFX_VIRTUAL(CCaptureDlg) ^{l^Z +b.  
 public: :}n\ r/i  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 97L|IZ s)  
 protected: O9/7?"l"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]ysEj3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); jWE?$r"  
  //}}AFX_VIRTUAL sfUKH;xC  
  // Implementation oBpoZ @[Z  
 protected: I `I+7~t  
  HICON m_hIcon; $TK<~3`  
  // Generated message map functions ? 3'O  
  //{{AFX_MSG(CCaptureDlg) W&'[Xj  
  virtual BOOL OnInitDialog(); Up*.z\|'y  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); M~SbIk<#a<  
  afx_msg void OnPaint(); z{uRq A G  
  afx_msg HCURSOR OnQueryDragIcon(); YB?5s`vr9d  
  virtual void OnCancel(); up^D9(y\  
  afx_msg void OnAbout(); S +mM S  
  afx_msg void OnBrowse(); pf%B  
  afx_msg void OnChange(); *y@Xm~ld  
 //}}AFX_MSG sSdnH_;&  
 DECLARE_MESSAGE_MAP() c 0/vB  
}; 3mCf>qj73  
#endif VKtZyhK"h  
.^o3  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &?wNL@n  
#include "stdafx.h" ] l@Mo7|w  
#include "Capture.h" 'G|M_ e  
#include "CaptureDlg.h" )^q7s&p/  
#include <windowsx.h> !7fL'  
#pragma comment(lib,"hook.lib") 1SY`V?cu  
#ifdef _DEBUG aZBS!X  
#define new DEBUG_NEW n72+X  
#undef THIS_FILE :Y\!~J3W  
static char THIS_FILE[] = __FILE__; J =j6rD  
#endif !$1'q~sO  
#define IDM_SHELL WM_USER+1 ?ZS/`P0}[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); p@Va`:RDW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -w3KBlo  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; )B1gX>J\8  
class CAboutDlg : public CDialog %+F%C=GqI  
{ Yfa`}hQ  
 public: ^v+3qm@,  
  CAboutDlg(); M&q3xo"w  
  // Dialog Data W81 dLeTZg  
  //{{AFX_DATA(CAboutDlg) grWmF3c#  
  enum { IDD = IDD_ABOUTBOX }; :@=;WB*0  
  //}}AFX_DATA 3Gyw^_{J  
  // ClassWizard generated virtual function overrides u.~`/O  
  //{{AFX_VIRTUAL(CAboutDlg) O S%  
 protected: n5e1k y*9w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t7; ^rk*  
  //}}AFX_VIRTUAL uNoP8U%*  
  // Implementation !YZ$WiPl  
 protected: R{3vPG  
  //{{AFX_MSG(CAboutDlg) 6{8dv9tK  
  //}}AFX_MSG %X^K5Io  
  DECLARE_MESSAGE_MAP() .r4M]1Of  
}; 5k]xi)%  
eX0ASI9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1v2pPUH\  
{ z c4l{+3  
 //{{AFX_DATA_INIT(CAboutDlg) 6%Ws>H4@|  
 //}}AFX_DATA_INIT "%[aWb  
} |u5Xi5q.f  
T x 6\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) M%S.Z4D (0  
{ |Js?@  
 CDialog::DoDataExchange(pDX); -Rcl(Q}LZ  
 //{{AFX_DATA_MAP(CAboutDlg) rfwX:R6,g  
 //}}AFX_DATA_MAP ?K>=>bS^h  
} 'v?"TZ  
?]In@h-  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3H_%2V6#V1  
 //{{AFX_MSG_MAP(CAboutDlg) |on$ )vm  
 // No message handlers [/'=M h  
 //}}AFX_MSG_MAP WPXLN'w+  
END_MESSAGE_MAP() jYJRG<*e  
)&$p?kF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1.6Y=Mh=i[  
: CDialog(CCaptureDlg::IDD, pParent) z pV+W-j]  
{ <>I4wqqb  
 //{{AFX_DATA_INIT(CCaptureDlg) k}tT l 2  
  m_bControl = FALSE; "H"4]m1Wc  
  m_bAlt = FALSE; }bM=)eUfX  
  m_bShift = FALSE; fJ8Q\lb<_  
  m_Path = _T("c:\\"); KsR^:_e  
  m_Number = _T("0 picture captured."); Z?AX  
  nCount=0; bzh`s<+  
  bRegistered=FALSE; b$O1I[o  
  bTray=FALSE; $1< ~J  
 //}}AFX_DATA_INIT 8*\PWl  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 E6njm du  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $Il:Yw_  
} ek9Y9eJ"  
uL1$yf'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ![}q9aeT  
{ ,LpGE>s  
 CDialog::DoDataExchange(pDX); P S [ifC  
 //{{AFX_DATA_MAP(CCaptureDlg) s?-J`k~q  
  DDX_Control(pDX, IDC_KEY, m_Key); 25m6/Y  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,{rm<M.)  
  DDX_Check(pDX, IDC_ALT, m_bAlt); B$)&;Q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); BH+@!H3 hf  
  DDX_Text(pDX, IDC_PATH, m_Path); d4[mR~XXT  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ^Ox|q_E w}  
 //}}AFX_DATA_MAP L kA_M'G  
} QT[yw6Z  
cq-UVk"Gl  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :^92B?q  
//{{AFX_MSG_MAP(CCaptureDlg) G zw $M  
 ON_WM_SYSCOMMAND() T#:n7$M|?A  
 ON_WM_PAINT() 2S#|[wq(  
 ON_WM_QUERYDRAGICON() $u-yw1FT  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) F `cuV  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) G;k#06  
 ON_BN_CLICKED(ID_CHANGE, OnChange) b,MzHx=im  
//}}AFX_MSG_MAP z&@O\>Q  
END_MESSAGE_MAP() "T0s7LWp  
~o?(O1QY  
BOOL CCaptureDlg::OnInitDialog() a3?D@@Qnw  
{ ,]* MI"  
 CDialog::OnInitDialog(); ~wl 4  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); mYRW/8+g  
 ASSERT(IDM_ABOUTBOX < 0xF000); +PfXc?VU  
 CMenu* pSysMenu = GetSystemMenu(FALSE); fRT4,;  
 if (pSysMenu != NULL) c^a D r  
 { L28DBjE)A  
  CString strAboutMenu; +;*dFL  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Tu*"+*r>s  
  if (!strAboutMenu.IsEmpty()) SuuLB6{u3  
  { hJsYKd8g  
   pSysMenu->AppendMenu(MF_SEPARATOR); vD@ =V#T  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /Q*o6G ys0  
  } YKtF)N;m]  
 } x.ZW%P1  
 SetIcon(m_hIcon, TRUE); // Set big icon $lYy`OuC  
 SetIcon(m_hIcon, FALSE); // Set small icon +#Q\;; FNP  
 m_Key.SetCurSel(0); X6`F<H`  
 RegisterHotkey(); /6@iRswa  
 CMenu* pMenu=GetSystemMenu(FALSE); l*(Ml= O{  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); .W/#$s|X\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); N# ?}r>W3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .{}=!>U2  
 return TRUE; // return TRUE unless you set the focus to a control {P[>B}'rW  
} hI Q 2s  
ytkV"^1^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dd&n>A3O=  
{ We51s^(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) qS.TVNZ  
 { Q#a<T4l  
  CAboutDlg dlgAbout; :l/?cV;  
  dlgAbout.DoModal(); :<w2j 6V  
 } LLlt9(^d  
 else }>T$2"pf  
 { qY^@^)b[  
  CDialog::OnSysCommand(nID, lParam); a"6AZT"8  
 } T|fmO<e*n  
} zJ9[),;7B  
:1/K$A)^{  
void CCaptureDlg::OnPaint() kafRuO~$  
{ 40ZHDtIu<  
 if (IsIconic()) QhqXd  
 { V% PeZ.Xv  
  CPaintDC dc(this); // device context for painting +q NX/F  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); BXx0Z %e.3  
  // Center icon in client rectangle t!S ja  
  int cxIcon = GetSystemMetrics(SM_CXICON); Q3OGU}F  
  int cyIcon = GetSystemMetrics(SM_CYICON); w,/&oe5M+  
  CRect rect; 4x;vn8 yh  
  GetClientRect(&rect); F]L$xU  
  int x = (rect.Width() - cxIcon + 1) / 2; L UitY  
  int y = (rect.Height() - cyIcon + 1) / 2; 9PZY](/  
  // Draw the icon &Ub0o2+y  
  dc.DrawIcon(x, y, m_hIcon); Eh{]so  
 } dYP-QUM$7  
 else k_$9cVA  
 { Rfuq(DwD6  
  CDialog::OnPaint(); f5p:o}U*  
 } wE*jN~  
} ;3 |Z}P  
G5K_e:i  
HCURSOR CCaptureDlg::OnQueryDragIcon() _pM~v>~*+  
{ 3\~ RWoB0u  
 return (HCURSOR) m_hIcon; bU+ z(Eg6  
} 1_Ag:> #X  
Z6Kw'3  
void CCaptureDlg::OnCancel() nS`DI92I  
{ N=hhuKt]  
 if(bTray) n@ rphJb  
  DeleteIcon(); oI/jGyY;  
  CDialog::OnCancel(); |#x]FNg  
} \8 ~`NF  
=^L?Sgg  
void CCaptureDlg::OnAbout() (ZI11[e{  
{ ^.]]0Rp&  
 CAboutDlg dlg; Fy!-1N9|l  
 dlg.DoModal(); N4z(2.  
} W\W|v?r  
B)1.CHV%<  
void CCaptureDlg::OnBrowse() ag~4m5n*~  
{ K$K6,54y  
 CString str; &1k2J   
 BROWSEINFO bi; Pn;Tg7oz  
 char name[MAX_PATH]; nWd]P\a'V  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); a*fUMhIi  
 bi.hwndOwner=GetSafeHwnd(); TGe)%jZ  
 bi.pszDisplayName=name; fQ@k$W\  
 bi.lpszTitle="Select folder"; Xgs 31#K  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; K.{:H4_  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); &q?A)R  
 if(idl==NULL) liuF;*  
  return; $cUTe  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 'Itsu~fza  
 str.ReleaseBuffer(); 6,D)o/_  
 m_Path=str; Uz&XqjS  
 if(str.GetAt(str.GetLength()-1)!='\\') H%AF,  
  m_Path+="\\"; fNkN  
 UpdateData(FALSE); V6.w=6:`X  
} Mr8r(LGY  
ls<7Qe"a  
void CCaptureDlg::SaveBmp() 'aFjyY?%  
{ j![;;  
 CDC dc; 1E]|>)$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); y_mD9bgW  
 CBitmap bm; u\,("2ZW9+  
 int Width=GetSystemMetrics(SM_CXSCREEN); y&$mN  
 int Height=GetSystemMetrics(SM_CYSCREEN); %#^)hX,+Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z6Owxqfht  
 CDC tdc; K:i{us`  
 tdc.CreateCompatibleDC(&dc); mROXwzL  
 CBitmap*pOld=tdc.SelectObject(&bm); c,\!<4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \vU1*:3  
 tdc.SelectObject(pOld); 0!^vQ  
 BITMAP btm; <o\2-fWvY  
 bm.GetBitmap(&btm); jZ;dY~fE  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; jw^Pt~@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -wqnmK+G  
 BITMAPINFOHEADER bih; m3La;%aA0  
 bih.biBitCount=btm.bmBitsPixel; xq.HR_\  
 bih.biClrImportant=0; rTR4j>Ua~  
 bih.biClrUsed=0; Ai 9UB=[R  
 bih.biCompression=0; ]nEZ Q+F  
 bih.biHeight=btm.bmHeight; kDrqV{_  
 bih.biPlanes=1; m ^O9G?  
 bih.biSize=sizeof(BITMAPINFOHEADER); WrS|$: 0  
 bih.biSizeImage=size; }.uB6&!:  
 bih.biWidth=btm.bmWidth; U!0 Qf7D  
 bih.biXPelsPerMeter=0; g7-=kmr|V  
 bih.biYPelsPerMeter=0; %Q0J$eC  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Bx>)i8P7i0  
 static int filecount=0; "HuV'  
 CString name; !E0zj9 [ R  
 name.Format("pict%04d.bmp",filecount++); $h({x~Oj9  
 name=m_Path+name; N0D)d  
 BITMAPFILEHEADER bfh; :-I~-Yj  
 bfh.bfReserved1=bfh.bfReserved2=0; vWM3JH~a6  
 bfh.bfType=((WORD)('M'<< 8)|'B'); RuW62QSq  
 bfh.bfSize=54+size; h7EKb-@  
 bfh.bfOffBits=54; 2rr}5i)r|  
 CFile bf; r dc} e"v  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Q|^TR__  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7d7"^M  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1b6o x6  
  bf.WriteHuge(lpData,size); ~m]sJpW<"  
  bf.Close(); E27N1J+1  
  nCount++; |Bv?! sjf  
 } yWs_Z6b  
 GlobalFreePtr(lpData); ~"Pu6-\VT  
 if(nCount==1) `@Q%}J  
  m_Number.Format("%d picture captured.",nCount); ~B NLzt3%O  
 else ?Q~6\xA  
  m_Number.Format("%d pictures captured.",nCount); Pmj]"7Vd[  
  UpdateData(FALSE); Mbt}G|;8H7  
} I1H} 5 bf3  
>UP{= `  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) X>n\@rTo  
{ B"-gK20vY  
 if(pMsg -> message == WM_KEYDOWN) :uAW  
 { s[V$f vW  
  if(pMsg -> wParam == VK_ESCAPE) ,@_$acm  
   return TRUE; L=. 4x=%%  
  if(pMsg -> wParam == VK_RETURN) ?a h<Qf]  
   return TRUE; {L!w/IeX  
 } j4au Zl]NF  
 return CDialog::PreTranslateMessage(pMsg); @aG1PG{  
} g[rxK n\Z  
x,s Ma*vd  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a:PS}_.  
{ kp4*|$]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Jl"),;Od  
  SaveBmp(); uc% &g  
  return FALSE; > n~l\ fC  
} e7{n=M  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =sqh PS<>  
 CMenu pop; iK*2 Z$`lw  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #xqeCX 4p  
 CMenu*pMenu=pop.GetSubMenu(0); 6\MJvg\;  
 pMenu->SetDefaultItem(ID_EXITICON); 3~e"CKD>  
 CPoint pt; G;n'c7BV  
 GetCursorPos(&pt); <&7KcvBn"4  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); TJ:B_F*bSk  
 if(id==ID_EXITICON) $J/Z~ (=JT  
  DeleteIcon(); @#T*OH  
 else if(id==ID_EXIT) ~~?4w.k  
  OnCancel(); k)W8%=R  
 return FALSE; BReNhk)S  
} f6 zT  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6]i"lqb  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) D t~Jx\\  
 AddIcon(); gI&& LwT4  
 return res; &%~2Wm  
} {iP^51fy  
Lm kv .XF  
void CCaptureDlg::AddIcon() RVFQ!0 C  
{ })V9d  
 NOTIFYICONDATA data; ^A8'YTl  
 data.cbSize=sizeof(NOTIFYICONDATA); or_x0Q  
 CString tip; 1cE3uA7  
 tip.LoadString(IDS_ICONTIP); pV#~$e  
 data.hIcon=GetIcon(0); ?_e2)+q8YG  
 data.hWnd=GetSafeHwnd(); ^X6fgsjz  
 strcpy(data.szTip,tip); tJ>OZ  
 data.uCallbackMessage=IDM_SHELL; v;S7i>\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (+<SR5,/3  
 data.uID=98; |Ire#0Nwx  
 Shell_NotifyIcon(NIM_ADD,&data); JM5 w`=  
 ShowWindow(SW_HIDE); p @@TOS  
 bTray=TRUE; G: FP9  
} %nJ^0X_]  
t[B\'f!  
void CCaptureDlg::DeleteIcon() 5oQy $Y  
{ pYo]lO  
 NOTIFYICONDATA data; $_-f}E  
 data.cbSize=sizeof(NOTIFYICONDATA); G9s: Wp  
 data.hWnd=GetSafeHwnd(); +OFq=M  
 data.uID=98; `A@{})+  
 Shell_NotifyIcon(NIM_DELETE,&data); ^CUeq"GYoZ  
 ShowWindow(SW_SHOW); N|c;Qzl  
 SetForegroundWindow(); O:fv1  
 ShowWindow(SW_SHOWNORMAL); 4@PH5z  
 bTray=FALSE; bk E4{P"  
} }2Y:#{m  
&pS <4  
void CCaptureDlg::OnChange() uBLI!N-G  
{   5;+OpB  
 RegisterHotkey(); B\a-Q,Wf  
} 4,m aA  
BN&^$1F((  
BOOL CCaptureDlg::RegisterHotkey() t\nYUL-H  
{ ?Kw~O"L8  
 UpdateData(); {n8mE,;M  
 UCHAR mask=0; 'AN3{  
 UCHAR key=0; Hm|8ydNs  
 if(m_bControl) Z~^)B8  
  mask|=4; .g.v  
 if(m_bAlt) 'rJkxU{  
  mask|=2; A4.Q \0  
 if(m_bShift) dxkq*  
  mask|=1; j nvi_Rodm  
  key=Key_Table[m_Key.GetCurSel()]; YC#N],#  
 if(bRegistered){ j  )6A  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); fu3/n@L  
  bRegistered=FALSE; w-?_U7'  
 } dzMlfJp  
 cMask=mask;  4l+"J:,  
 cKey=key; V6Kw71'9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); oLEqy  
 return bRegistered; m72r6Yq2@  
} K_ P08  
Qvh: hkR  
  四、小结 y^:!]-+  
WpE\N0Yg  
  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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