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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: ./g#<  
  *|3z($*U]  
  一、实现方法 v4.V%tg!  
Q?;ntzi  
  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: }N|/b"j9  
Qp?+_<{  
#pragma data_seg("shareddata") uA,{C%?  
HHOOK hHook =NULL; //钩子句柄 jXDo!a| 4y  
UINT nHookCount =0; //挂接的程序数目 {vH8X(m  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $ta#] >{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 p}!pT/KmpH  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey V9bLm,DtT  
static int KeyCount =0; CFA>  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 R"=M5  
#pragma data_seg() ky%%H;  
Oxvw`a#  
  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。 A&7jE:Ew  
?d0Dfqh_  
  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: lKwcT!Q4  
$G}Q}f  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR W P&zF$  
cKey,UCHAR cMask) N~kYT\$b#  
{ P3|<K-dFAK  
 BOOL bAdded=FALSE; ujh4cp  
 for(int index=0;index<MAX_KEY;index++){ SYwNx">Bq  
  if(hCallWnd[index]==0){ ;(,Fe/wvC  
   hCallWnd[index]=hWnd; '[E_7$d  
   HotKey[index]=cKey; l`]!)j|+  
   HotKeyMask[index]=cMask; hzH5K  
   bAdded=TRUE; O:x%!-w  
   KeyCount++; iTvCkb48m  
   break; n 3]y$wK  
  } ?(=B=a[  
 } U,S286  
 return bAdded; p[GyQ2k)  
} ?C{N0?[P-  
//删除热键 ZM.g +-9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?yb{DZ46  
{ OR9){qP  
 BOOL bRemoved=FALSE; pp`U]Q5"gX  
 for(int index=0;index<MAX_KEY;index++){ G<eJ0S  
  if(hCallWnd[index]==hWnd){ a+i+#*8wm  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `!8Z"xD  
    hCallWnd[index]=NULL; jY.%~Y1y  
    HotKey[index]=0; e- CW4x  
    HotKeyMask[index]=0; zE/(F;> FV  
    bRemoved=TRUE; O5?Eb  
    KeyCount--; yB1>83!q  
    break; 1hWz%c|  
   } 4{g|$@s(  
  } iE`aGoA  
 } l:"*]m7o_  
 return bRemoved; A&'%ou  
} &O,$l3 P  
yw<xv-Q=i  
D=vq<X'  
  DLL中的钩子函数如下: 2cl~Va=  
wp*1HnWj8Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ( -@>  
{ Zv\b`Cf}  
 BOOL bProcessed=FALSE; y|se^dn  
 if(HC_ACTION==nCode) aB)DX  
 { Z(eSnV_RL  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 NZ5~\k  
   switch(wParam) nE;gM1I  
   {  sCl,]g0{  
    case VK_MENU: IycxRig  
     MaskBits&=~ALTBIT; ,gc#N  
     break; cg%CYV)  
    case VK_CONTROL: WU\bJ}  
     MaskBits&=~CTRLBIT; W|e>  
     break; W!X]t)Ow  
    case VK_SHIFT: c,wU?8Nc|$  
     MaskBits&=~SHIFTBIT; /f<(K-o]  
     break; i#=X#_ +El  
    default: //judge the key and send message @k,(i=**  
     break; 7p$*/5fk  
   } M(uB ;Te  
   for(int index=0;index<MAX_KEY;index++){ 9a%@j ]  
    if(hCallWnd[index]==NULL) nW_  
     continue; v!xrUyN~m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |Ze}bM=N  
    { BkfBFUDQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %#a%Luq  
     bProcessed=TRUE; Hrnql  
    } _'U?!  
   } E;H(jVZ  
  } n #I}!x>2  
  else if((lParam&0xc000ffff)==1){ //有键按下 P0z{R[KBH  
   switch(wParam) =[+&({  
   { OvG0UXRU  
    case VK_MENU: *,*qv^  
     MaskBits|=ALTBIT; iGk{8Da<  
     break; z]AS@}wWqg  
    case VK_CONTROL: @\8gzvkt  
     MaskBits|=CTRLBIT; X)OP316yx  
     break; Qu_T&  
    case VK_SHIFT: hp4(f W  
     MaskBits|=SHIFTBIT; o7XRa]O  
     break; , ~X;M"U  
    default: //judge the key and send message qu+2..3  
     break; vP?S0>gh  
   } #.YcIR)  
   for(int index=0;index<MAX_KEY;index++){ );DIrA  
    if(hCallWnd[index]==NULL) 2kq@*}ys  
     continue; 8]\h^k4f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {fv8S;|u  
    { FF~4y>R7u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); neFno5dj  
     bProcessed=TRUE; O Zm[i H  
    } D  .R  
   } s'Gy+h.  
  } "Cj#bUw  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i6 ?JX@I  
   for(int index=0;index<MAX_KEY;index++){ RgA4@J#  
    if(hCallWnd[index]==NULL) jgw'MpQm{  
     continue; ]?$y}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Aq'E:/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )#~fS28j  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 SkRQFm0a~  
   } m (:qZW  
  } Ec*7n6~9  
 } {; cB?II  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WC*:\:mh  
} Q]UYG(  
(kyo?3  
  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: an[~%vxw}  
J4c4Os>3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); nY-9 1q?Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ytwv=;h-  
'OW"*b  
  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: ]u ~Fn2  
 m+{: ^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) G0Tc}_o<Y  
{ :vyf-K 74M  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @b\_696.  
 { G$9|aaf`1#  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z*)Y:tk)b  
  SaveBmp(); W<]Oo]  
  return FALSE; .r%|RWs6W  
 } S&]<;N_B  
 …… //其它处理及默认处理 '/gwC7*-&  
} u!Nfoq&'u  
V?dK*8s  
g] C3 lf-  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 qq3Qd,$Z  
U]EuDNkO{  
  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。 zRE8299%z  
UA4d|^ev  
  二、编程步骤  ,bp pM  
<O)X89dFM  
  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"; u4M2Ec  
P^m 6di  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )r,R!8  
L{%a4 Ip  
  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; C|;Mhe'r=  
FDs^S)B  
  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; 64rk^Um  
_JIUds5  
  5、 添加代码,编译运行程序。 4yZ+,hqJ<9  
SJc@iffS  
三、程序代码 KM(9& 1/  
jP.b oj_u*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL @&xaaqQ-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) L0|hc  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ c1AG3Nb  
#if _MSC_VER > 1000 o``>sBZOq  
#pragma once /A))"D  
#endif // _MSC_VER > 1000 >AX~c jo  
#ifndef __AFXWIN_H__ ;(0$~O$3u  
#error include 'stdafx.h' before including this file for PCH AD%D ,l  
#endif bKMR7&e.Ep  
#include "resource.h" // main symbols ~TFYlV  
class CHookApp : public CWinApp bd P,Zqd  
{ ?&<o_/`-H5  
 public: c[RL Yu  
  CHookApp(); a(DZGQ-as  
  // Overrides /j69NEl  
  // ClassWizard generated virtual function overrides l(w vQO  
  //{{AFX_VIRTUAL(CHookApp) 4zfRD`;  
 public: aGk%I  
  virtual BOOL InitInstance(); U;Ll.BFP  
  virtual int ExitInstance(); grxl{uIC8  
  //}}AFX_VIRTUAL P:, x?T?J^  
  //{{AFX_MSG(CHookApp) e=jT]i*cU  
  // NOTE - the ClassWizard will add and remove member functions here. eQax ZMU  
  // DO NOT EDIT what you see in these blocks of generated code ! LSu^#B  
  //}}AFX_MSG >"<k8wn  
  DECLARE_MESSAGE_MAP() jM1%6  
}; 69j~?w)^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &<|-> *v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u6Qf*_-K  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); oSA*~N:  
BOOL InitHotkey(); b801O F  
BOOL UnInit(); LUDJPIk  
#endif PSf5p\<5  
$FusDdCv3  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 'uf\.F  
#include "stdafx.h" q&Tn>B  
#include "hook.h" H~dHVQtJZ  
#include <windowsx.h> =Wk/q_.  
#ifdef _DEBUG  e_~fJ  
#define new DEBUG_NEW >AzWM .r  
#undef THIS_FILE 7}cDGdr  
static char THIS_FILE[] = __FILE__; D@\;@( |  
#endif H9san5{  
#define MAX_KEY 100 |!?WQ[  
#define CTRLBIT 0x04 s\C8t0C  
#define ALTBIT 0x02 ^L-w(r62<  
#define SHIFTBIT 0x01 #;"D)C  
#pragma data_seg("shareddata") :IR9=nhS]  
HHOOK hHook =NULL; $S=~YzO  
UINT nHookCount =0; 4`U0">gY  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 24jtJC,7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT o!toO&=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^>X)"'0+  
static int KeyCount =0; c@ZS|U*(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift w*u{;v#  
#pragma data_seg() 8 ih;#I=q  
HINSTANCE hins; ]C ~1]7vb  
void VerifyWindow(); bH\C5zt6(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) mYh5#E41J  
//{{AFX_MSG_MAP(CHookApp) %`?;V;{=  
// NOTE - the ClassWizard will add and remove mapping macros here. ?)' 2l6  
// DO NOT EDIT what you see in these blocks of generated code! 9XoQO9*Q  
//}}AFX_MSG_MAP ^K.u ~p   
END_MESSAGE_MAP() phgexAq  
6vgBqn[  
CHookApp::CHookApp() 5`E`Kb+@  
{ '{0[&i*  
 // TODO: add construction code here,  &(1H!  
 // Place all significant initialization in InitInstance 5K ,#4EOV  
} IObx^N_K  
_}e7L7B7g  
CHookApp theApp; %/y`<lJz(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z6^QB@moj  
{ @1qdd~B}  
 BOOL bProcessed=FALSE; 9:%n=URd  
 if(HC_ACTION==nCode) `D)Lzm R  
 { ,]Ro',A&  
  if((lParam&0xc0000000)==0xc0000000){// Key up }{5mH:  
   switch(wParam) wMz-U- z  
   { v0Ai!#  
    case VK_MENU: iIsEQh  
     MaskBits&=~ALTBIT; ;n} >C' :  
     break; (rr}Pv%yb  
    case VK_CONTROL: Gg9VS&VI  
     MaskBits&=~CTRLBIT; @q&|MMLt  
     break; -Aa]aDAz68  
    case VK_SHIFT: /Fe:h >6  
     MaskBits&=~SHIFTBIT; e2k4[V  
     break; 79SqYe=&uy  
    default: //judge the key and send message @n7t?9Bx  
     break; L\}Pzxn  
   } ]am~aJ|L  
   for(int index=0;index<MAX_KEY;index++){ 6X7s 4  
    if(hCallWnd[index]==NULL) Xb]=:x(  
     continue; I(]BMMj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T~%H%O(F  
    { sn-)(XU!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $T?*0"Mj[  
     bProcessed=TRUE; g/8.W  
    } )RwBg8  
   } ?0rOcaTY  
  } v<;: 0  
  else if((lParam&0xc000ffff)==1){ //Key down hojHbmm4  
   switch(wParam) |e*GzD  
   { OE'K5oIM  
    case VK_MENU: l#D-q/k?  
     MaskBits|=ALTBIT; z wL3,!t  
     break; A3AP51 !  
    case VK_CONTROL: Mo}H_8y  
     MaskBits|=CTRLBIT; T&r +G!2  
     break; N%9h~G  
    case VK_SHIFT: #>8T*B  
     MaskBits|=SHIFTBIT; e,f ;  
     break; W.A1m4l58R  
    default: //judge the key and send message ~{L.f94N  
     break; J3B6X8P'  
   } =- $!:W~  
   for(int index=0;index<MAX_KEY;index++) OlMBMUR:  
   { #B @X  
    if(hCallWnd[index]==NULL) i`prv&  
     continue; VpkD'<G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) aSOU#Csx  
    { J&M1t#UN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n6b3E *  
     bProcessed=TRUE; ?ork^4 $s  
    } [}>#YPZ  
   } 1~%o}+#-  
  } ,e9CJ~a  
  if(!bProcessed){ u8Y~_)\MA  
   for(int index=0;index<MAX_KEY;index++){ '#v71,  
    if(hCallWnd[index]==NULL) m CM|&u  
     continue; [2Iau1<@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tbq|,"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 6W5d7`A  
   } Lf >YdD  
  } 4s9c#nVlu  
 } YgCc|W3{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); $v]T8|h  
} o2DtCU-A  
jFtg.SD  
BOOL InitHotkey() !#q{Z>H`  
{ hM~eJv  
 if(hHook!=NULL){ ><[| G9  
  nHookCount++; U.: sK*  
  return TRUE; Aj,]n>{  
 } ],n%Xp  
 else i 'qMi~{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8QV t, 'I  
  if(hHook!=NULL) < CDA"  
   nHookCount++; z^r |3;  
  return (hHook!=NULL); |K%}}g[<e;  
} (@ "=F6P  
BOOL UnInit() v"rl5x  
{ vF"c  
 if(nHookCount>1){ 5^yG2&>#  
  nHookCount--; K<FKu $=  
  return TRUE; @7-=zt+f  
 } uJgI<l'|e3  
 BOOL unhooked = UnhookWindowsHookEx(hHook); hp*<x4%*a"  
 if(unhooked==TRUE){ rJu[ N(2k  
  nHookCount=0; zLP],wB  
  hHook=NULL; Z | We9%  
 } !Cw!+fZ\l  
 return unhooked; *vYn_wE  
} MSl&?}Bj  
`\!X}xiWd  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [OzzL\)3l  
{ 9qpU@V!  
 BOOL bAdded=FALSE; !#?8BwnaZ  
 for(int index=0;index<MAX_KEY;index++){ O}QFq14<+  
  if(hCallWnd[index]==0){ Rp0|zP,5  
   hCallWnd[index]=hWnd; q/$ GE,"  
   HotKey[index]=cKey; \^LWCp,C"  
   HotKeyMask[index]=cMask; r@iASITX  
   bAdded=TRUE; u)v$JpNE  
   KeyCount++; &pM'$}T*  
   break; P*YK9Hl<  
  } >8|+%pK8<  
 } `fz,Lh*v  
 return bAdded; =`-|&  
} =+<d1W`>0  
u, eZ6  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #4><r.v3  
{ Nsn~@.UuSW  
 BOOL bRemoved=FALSE; b$Ln} <  
 for(int index=0;index<MAX_KEY;index++){ fD{II+T  
  if(hCallWnd[index]==hWnd){ i}B;+0<drx  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]=x\b^  
    hCallWnd[index]=NULL; (= 9 wo  
    HotKey[index]=0; hT'=VN  
    HotKeyMask[index]=0; aVwH  
    bRemoved=TRUE; P/MM UmO  
    KeyCount--; ~].ggcl`w  
    break; "mOI!x f@a  
   } '.Z4 hHX  
  } ^;r+W -MQ  
 } \5~;MI.Sq  
 return bRemoved; $o.Kn9\  
} M;KA]fmc  
rgqQxe=  
void VerifyWindow() Iq^if>  
{ b#/i.!:a  
 for(int i=0;i<MAX_KEY;i++){ \0ov[T N.>  
  if(hCallWnd!=NULL){ P]Xbjs<p  
   if(!IsWindow(hCallWnd)){ G`F8!O(  
    hCallWnd=NULL; @A{m5h  
    HotKey=0; ;wR 'z$8  
    HotKeyMask=0; +{$QAjW(/  
    KeyCount--; \3zp)J  
   } rQJ"&CapT  
  } K"\MU  
 } 6):Xzx,  
} f@@s1gdb  
y\'P3ihK  
BOOL CHookApp::InitInstance() \~#WY5  
{ EB!daZH,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (?3[3 w~  
 hins=AfxGetInstanceHandle(); rC BfD  
 InitHotkey(); ,PECYwegkt  
 return CWinApp::InitInstance(); lZW K2  
} ]Bnwk o  
,a0pAj  
int CHookApp::ExitInstance() ;Lo&}U3F,!  
{ 7?nJ4x1  
 VerifyWindow(); 3~Qd)j"<  
 UnInit(); f<<rTE6  
 return CWinApp::ExitInstance(); XV>&F{  
} inAAgW#s}  
<x0H@?f7  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -.iNNM&a  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) |cDszoT /  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0q,pi qjO  
#if _MSC_VER > 1000 I :)W*SK  
#pragma once k1='c7s  
#endif // _MSC_VER > 1000 Y]N,.pv=  
Puh$%;x  
class CCaptureDlg : public CDialog aY)2eY  
{ _M t Qi  
 // Construction g5S?nHS}  
 public: B4ZIURciGz  
  BOOL bTray; T6M+|"92  
  BOOL bRegistered; {G3i0 r  
  BOOL RegisterHotkey(); rNlW7 Y  
  UCHAR cKey; E4i0i!<z  
  UCHAR cMask; u6Je@e_!  
  void DeleteIcon(); --fFpM3EvS  
  void AddIcon(); 1J}8sG2`  
  UINT nCount; `f9gC3Hk  
  void SaveBmp(); 6CCbBA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^"i~ DC  
  // Dialog Data wX,F`e3"/  
  //{{AFX_DATA(CCaptureDlg) ;%Hf)F  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8)yI<`q6  
  CComboBox m_Key; 5$rSEVg9  
  BOOL m_bControl; h}L}[   
  BOOL m_bAlt; fuX'~$b.fA  
  BOOL m_bShift; bZ 443SG  
  CString m_Path; T$+-IAE  
  CString m_Number; _&#S@aGw  
  //}}AFX_DATA |Au]1}  
  // ClassWizard generated virtual function overrides L}sx<=8.m  
  //{{AFX_VIRTUAL(CCaptureDlg) \or G63T:  
 public: .*YD&(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ?okx<'"[  
 protected: a9U_ug58  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )92r{%N  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); o[1ylzk}+  
  //}}AFX_VIRTUAL 8K"+,s(%R  
  // Implementation ~9\zWRh  
 protected: r0]4=6U  
  HICON m_hIcon; q| .dez'  
  // Generated message map functions }{[mrG   
  //{{AFX_MSG(CCaptureDlg) 7KjUW\mN2Z  
  virtual BOOL OnInitDialog(); hBU\'.x  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); > \Sr{p5KR  
  afx_msg void OnPaint(); 0N:XIGFa  
  afx_msg HCURSOR OnQueryDragIcon(); %Ym^{N  
  virtual void OnCancel(); '%saL>0  
  afx_msg void OnAbout(); x@>&IBiL  
  afx_msg void OnBrowse();  n_nl{  
  afx_msg void OnChange(); 5n lMrK  
 //}}AFX_MSG X"aEJ|y  
 DECLARE_MESSAGE_MAP() MXD4|r(  
}; @b#^ -  
#endif k1 -~  
#Q"O4 b:8  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file w ej[+y-  
#include "stdafx.h" %A/_5;PZ/  
#include "Capture.h" 1|r,dE2k9  
#include "CaptureDlg.h" sTRJ:fR  
#include <windowsx.h> je/!{(  
#pragma comment(lib,"hook.lib") O,@~L$a:YZ  
#ifdef _DEBUG I=DxRgt  
#define new DEBUG_NEW 7q =G&e7  
#undef THIS_FILE @A<PkpNL  
static char THIS_FILE[] = __FILE__; ?sz)J 3  
#endif dt}_D={Be  
#define IDM_SHELL WM_USER+1 Zw1U@5}A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^P'{U26  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'x"08v$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; !h[VUg_8  
class CAboutDlg : public CDialog 6NWn(pZ]p  
{ _~u2: yl (  
 public: ZraT3  
  CAboutDlg(); rjx6Djo>  
  // Dialog Data a>O9pX  
  //{{AFX_DATA(CAboutDlg) J%lgR  
  enum { IDD = IDD_ABOUTBOX }; )\uO9PB[O  
  //}}AFX_DATA 81LNkE,  
  // ClassWizard generated virtual function overrides nC1zzFFJ  
  //{{AFX_VIRTUAL(CAboutDlg) =ONHK F[UJ  
 protected: ^5GW$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support cvd\/pG)  
  //}}AFX_VIRTUAL mLV[uhq   
  // Implementation SMH<'F7i  
 protected: 2 {Vcb  
  //{{AFX_MSG(CAboutDlg) M$4[)6Y  
  //}}AFX_MSG }Z-Z|G)#  
  DECLARE_MESSAGE_MAP() < 0M:"^f  
}; $Fkaa<9;P  
B~ S6R  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %V9ZyQg%*  
{ <_Z:'~Zp  
 //{{AFX_DATA_INIT(CAboutDlg) 7Z ;?b0W  
 //}}AFX_DATA_INIT ) rW&c- '  
} :r#)z4d5  
azQD>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) d[p;T\?"  
{ L|-98]8>  
 CDialog::DoDataExchange(pDX); Q6gt+FKU9  
 //{{AFX_DATA_MAP(CAboutDlg) 1923N]b  
 //}}AFX_DATA_MAP Y6i _!z[V[  
} G7!W{;@I  
m %;D  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DGW+>\G  
 //{{AFX_MSG_MAP(CAboutDlg) NA3 \  
 // No message handlers osARA3\Xt  
 //}}AFX_MSG_MAP tZ`Ts}\e  
END_MESSAGE_MAP() L(T12s  
<f@"HG l  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zZcnijWb  
: CDialog(CCaptureDlg::IDD, pParent) {@! Kx`(:  
{ jHN +5=l  
 //{{AFX_DATA_INIT(CCaptureDlg) -HSs^dP`  
  m_bControl = FALSE; g_5QA)4x  
  m_bAlt = FALSE; gz2\H}  
  m_bShift = FALSE; o8e?J\?  
  m_Path = _T("c:\\"); n1 6 `y}  
  m_Number = _T("0 picture captured."); 0Wa}<]:^  
  nCount=0; G,Z^g|6  
  bRegistered=FALSE; !q"W{P  
  bTray=FALSE; wo_,Y0vfB  
 //}}AFX_DATA_INIT fb8%~3i>  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 dL7E<?l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Y!iZW  
} 8k q5ud  
!Z VU,b>  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) _iNq"8>2  
{ ~{sG| ;/!*  
 CDialog::DoDataExchange(pDX); !EUan  
 //{{AFX_DATA_MAP(CCaptureDlg) Bqma\1cgb  
  DDX_Control(pDX, IDC_KEY, m_Key); W>-Et7&2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -*5Rnx|Y{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .920{G?l5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); bR@p<;G|  
  DDX_Text(pDX, IDC_PATH, m_Path); ]smkTo/  
  DDX_Text(pDX, IDC_NUMBER, m_Number); qC F5~;7  
 //}}AFX_DATA_MAP [Nn`l,  
} }neY<{z  
c'/l,k  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C8FB:JNJV  
//{{AFX_MSG_MAP(CCaptureDlg) __mF ?m  
 ON_WM_SYSCOMMAND() BIuK @$  
 ON_WM_PAINT() \%UkSO\nO3  
 ON_WM_QUERYDRAGICON()  V#VN %{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7{&|;U  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &0f5:M{P  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %v20~xW :o  
//}}AFX_MSG_MAP 9z6XF]A  
END_MESSAGE_MAP() y;/VB,4V  
(o3 Iy  
BOOL CCaptureDlg::OnInitDialog() jKt7M>P  
{ l;o1 d-n]  
 CDialog::OnInitDialog(); (#+^&1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6@DF  
 ASSERT(IDM_ABOUTBOX < 0xF000); /Q,mJ.CnSR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); J:V?EE,\-  
 if (pSysMenu != NULL) jy-{~xdg[  
 { >/|q:b^2r  
  CString strAboutMenu; /SYw;<=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @)J+,tg/7  
  if (!strAboutMenu.IsEmpty()) M4as  
  { )1X#*mCxk  
   pSysMenu->AppendMenu(MF_SEPARATOR); ZP{*.]Qu  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~"A+G4jl  
  } `OSN\"\ad  
 } '],J$ge  
 SetIcon(m_hIcon, TRUE); // Set big icon v:H$<~)E|  
 SetIcon(m_hIcon, FALSE); // Set small icon |i++0BU  
 m_Key.SetCurSel(0); Ub6jxib  
 RegisterHotkey(); 0_88V  
 CMenu* pMenu=GetSystemMenu(FALSE); (o`{uj{!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); A~-b!Grf  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); UX7t`l2R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <)1qt 9  
 return TRUE; // return TRUE unless you set the focus to a control | Bi!  
} om1eQp0N  
HTG%t/S  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) gEjdN.  
{ KCs[/]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ]\|VpIg  
 { h $2</J"  
  CAboutDlg dlgAbout; 0Vx.nUQ  
  dlgAbout.DoModal(); a\r\PBi  
 } !r<pmr3f@7  
 else &Xf}8^T<V  
 { 4<BjC[@~Z{  
  CDialog::OnSysCommand(nID, lParam); wb0L.'jyR)  
 } 1y}Y9mlD.  
} VVlr*`  
z4N*b"QF  
void CCaptureDlg::OnPaint() jyCXJa-!-  
{ q@{Bt{$x  
 if (IsIconic()) /'/Xvm3  
 { $&=S#_HQS  
  CPaintDC dc(this); // device context for painting LGn:c;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); }4,L%$@n  
  // Center icon in client rectangle 'dn]rV0(C  
  int cxIcon = GetSystemMetrics(SM_CXICON); !z>6 Uf!{  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2'w?\{}D  
  CRect rect; \.-bZ$  
  GetClientRect(&rect); ?32&]iM oW  
  int x = (rect.Width() - cxIcon + 1) / 2; w(L4A0K[  
  int y = (rect.Height() - cyIcon + 1) / 2; E 7{U |\  
  // Draw the icon H*}y^ )x  
  dc.DrawIcon(x, y, m_hIcon); ~A\GT$  
 } > ;*b|Ik  
 else y+NN< EY@  
 { |!4K!_y  
  CDialog::OnPaint(); o4Om}]Ti  
 } .6Pw|xu`Pw  
} d$1@4r  
wfH^<jY)E  
HCURSOR CCaptureDlg::OnQueryDragIcon() I`!<9OTBj  
{ 6^`1\ #f  
 return (HCURSOR) m_hIcon; F'21jy&  
} K|[*t~59  
jWA(C; W  
void CCaptureDlg::OnCancel() 'd9INz.  
{ )?anOD[  
 if(bTray) %lGl,me H  
  DeleteIcon(); 9w7n1k.  
  CDialog::OnCancel(); HMNLa*CL'  
} 2fL;-\!y(  
H*PSR  
void CCaptureDlg::OnAbout() eceP0x  
{ fumm<:<CLO  
 CAboutDlg dlg; 1n;0?MIZ  
 dlg.DoModal(); ?82xdp g  
} >G25m'&,7  
do>wwgr  
void CCaptureDlg::OnBrowse() GBPo8L"9  
{ FOE4>zE  
 CString str; ;@oN s-  
 BROWSEINFO bi; &OH={Au  
 char name[MAX_PATH]; Fww :$^_ k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); W:pIPDx1=!  
 bi.hwndOwner=GetSafeHwnd(); NXrJfp  
 bi.pszDisplayName=name; s{ *[]!  
 bi.lpszTitle="Select folder"; k5'Vy8q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; _ 9F9W{'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); o6.^*%kM'  
 if(idl==NULL) f*?]+rz  
  return; iP7(tnlW$  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); rX2.i7i,  
 str.ReleaseBuffer(); yPb"V  
 m_Path=str; !$gR{XH$]  
 if(str.GetAt(str.GetLength()-1)!='\\') GjvOM y  
  m_Path+="\\"; N 5lDS  
 UpdateData(FALSE); Pd_U7&w,5  
} 9y"@(  
0AL=S$B)  
void CCaptureDlg::SaveBmp() p8Qk 'F=h  
{ |v 3T!  
 CDC dc; vdc\R?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); gCB |DY  
 CBitmap bm; @niHl  
 int Width=GetSystemMetrics(SM_CXSCREEN); Swig;`  
 int Height=GetSystemMetrics(SM_CYSCREEN); s"r*YlSp"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); g}1B;zGf  
 CDC tdc; V17%=bCZ5[  
 tdc.CreateCompatibleDC(&dc); iP ->S\  
 CBitmap*pOld=tdc.SelectObject(&bm); .WZ^5>M-  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  iu=7O  
 tdc.SelectObject(pOld); UGV+/zxIM  
 BITMAP btm; ;n*.W|Uph  
 bm.GetBitmap(&btm); =O5pY9UO  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; kTOzSiq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); lZ]ZDb?P  
 BITMAPINFOHEADER bih; y51e%n$  
 bih.biBitCount=btm.bmBitsPixel; :!WHFB o 8  
 bih.biClrImportant=0; u}macKJmp\  
 bih.biClrUsed=0; Z>k#n'm^z  
 bih.biCompression=0; "o-z y'I  
 bih.biHeight=btm.bmHeight; $ r@zs'N  
 bih.biPlanes=1; E Nh l&J  
 bih.biSize=sizeof(BITMAPINFOHEADER); "jKY1* ?  
 bih.biSizeImage=size; -b9\=U[  
 bih.biWidth=btm.bmWidth; R'as0 u\  
 bih.biXPelsPerMeter=0; SJn;{X>)q  
 bih.biYPelsPerMeter=0; [}E='m}u9+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS);  M^=zt  
 static int filecount=0; On9A U:\  
 CString name; 6*78cg Io  
 name.Format("pict%04d.bmp",filecount++); FXG]LoP  
 name=m_Path+name; "c%0P"u  
 BITMAPFILEHEADER bfh; FrfM3x6UM  
 bfh.bfReserved1=bfh.bfReserved2=0; gwuI-d^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o,\$ZxSlm  
 bfh.bfSize=54+size; :+^lJ&{U  
 bfh.bfOffBits=54; *K8$eDNZ  
 CFile bf; hd%F nykq  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ '}53f2%gKa  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ?jv/TBZX4  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); $]/{[@5  
  bf.WriteHuge(lpData,size); N2^=E1|_  
  bf.Close(); 5y.WMNNv{  
  nCount++;  MzdV2.  
 } & p  
 GlobalFreePtr(lpData); /|6N*>l)y  
 if(nCount==1) /$Nsd  
  m_Number.Format("%d picture captured.",nCount); /=nJRC3.  
 else }c,}V  
  m_Number.Format("%d pictures captured.",nCount); 24 'J  
  UpdateData(FALSE); [.7d<oY  
} xX&+WR  
_Eo[7V{NY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ^,TO#%$iE  
{ MS~(D.@ZS  
 if(pMsg -> message == WM_KEYDOWN) V(I8=rVH  
 { $Vg>I>i  
  if(pMsg -> wParam == VK_ESCAPE) BO?%'\  
   return TRUE; zZPO&akB"  
  if(pMsg -> wParam == VK_RETURN) nV|EQs4(  
   return TRUE; mp1@|*Sn  
 } Uiw2oi&_  
 return CDialog::PreTranslateMessage(pMsg); 3wF;GG  
} nfbR P t  
l ^0@86  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #jvtUS\  
{ hR?{3d#x2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Mq156TL  
  SaveBmp(); hn G Z=  
  return FALSE; e'NJnPO  
} me$Z~/Akm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ AlaW=leTe  
 CMenu pop; 5{X<y#vAC0  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {UI+$/v#  
 CMenu*pMenu=pop.GetSubMenu(0); y%cP1y)  
 pMenu->SetDefaultItem(ID_EXITICON); hED}h![  
 CPoint pt; g wRZ%.Cn  
 GetCursorPos(&pt); |tH4:%Q'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Q~ w|#  
 if(id==ID_EXITICON) Rsm^Z!sn  
  DeleteIcon(); Vx u0F]%  
 else if(id==ID_EXIT) tCH!my_  
  OnCancel(); L ca}J&x]^  
 return FALSE; /hR&8 `\\  
} W:2( .?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $t[FH&c(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 9s q  
 AddIcon(); Tx# Mn~xD  
 return res; N#_H6TfMG  
} kS);xA8s]  
L~OvY  
void CCaptureDlg::AddIcon() b{&)6M)zo  
{ M'O <h  
 NOTIFYICONDATA data; ?dg [:1R}  
 data.cbSize=sizeof(NOTIFYICONDATA); BL }\D;+t  
 CString tip; )qw&%sO +  
 tip.LoadString(IDS_ICONTIP); ~TD0z AA&  
 data.hIcon=GetIcon(0); ""G'rN_=Bi  
 data.hWnd=GetSafeHwnd(); 'n3uu1C  
 strcpy(data.szTip,tip); oJz^|dW  
 data.uCallbackMessage=IDM_SHELL; \!ZTL1b8t  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 1.GQau~  
 data.uID=98; 7>%8eEc  
 Shell_NotifyIcon(NIM_ADD,&data); `*R:gE=  
 ShowWindow(SW_HIDE); {%H'z$|{  
 bTray=TRUE; BX7kO0j  
} Xc-'Y"}|`t  
T.BW H2gRP  
void CCaptureDlg::DeleteIcon() A?P_DA  
{ 6%_nZvRv  
 NOTIFYICONDATA data; UB@+c k  
 data.cbSize=sizeof(NOTIFYICONDATA); .t!x<B  
 data.hWnd=GetSafeHwnd(); +I|vzz`ZVr  
 data.uID=98; KkbDW3-  
 Shell_NotifyIcon(NIM_DELETE,&data); 7Ovi{xd@  
 ShowWindow(SW_SHOW); ^jZbo {  
 SetForegroundWindow(); \r+ a GB  
 ShowWindow(SW_SHOWNORMAL); [RhO$c$[\  
 bTray=FALSE; ea 'D td  
} ^}o2  
!l8PDjAE  
void CCaptureDlg::OnChange() L#sMSVC+  
{ :DNY7TvZ  
 RegisterHotkey(); 0S!K{xyR  
} k?^z;Tlvw  
$%#!bV  
BOOL CCaptureDlg::RegisterHotkey() (uE!+2C  
{ ]2KihP8z x  
 UpdateData(); S4z;7z(8+  
 UCHAR mask=0; ?N9uu4  
 UCHAR key=0; YU'E@t5  
 if(m_bControl) sUQ@7sTj  
  mask|=4; @# l= l  
 if(m_bAlt) hHnYtq  
  mask|=2; @I?=<Riu  
 if(m_bShift) BQMpHSJ_  
  mask|=1;  x'<X!gw  
  key=Key_Table[m_Key.GetCurSel()]; + [mk<pQ  
 if(bRegistered){ ?Z/V~,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); b3, _(;A!  
  bRegistered=FALSE; H*CW1([  
 } /y}xX  
 cMask=mask; 9rf)gU3{+L  
 cKey=key; 8<Av@9 *}  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); )Ql%r?(F+  
 return bRegistered; Vt#.eL)Ee  
} e(t\g^X  
E:nF$#<'N  
  四、小结 NC(~l  
zQd 2  
  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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