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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: fi bR:8  
  J,7_5V@jJ  
  一、实现方法 a#uJzYB0  
1"v;w!uh  
  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: 1d\K{ 7i#  
*,'"\n  
#pragma data_seg("shareddata") t8?+yG;  
HHOOK hHook =NULL; //钩子句柄 N"E\o,_  
UINT nHookCount =0; //挂接的程序数目 ioa 1n=j  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i w m7M  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P]6pPS  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey c$e~O-OVD?  
static int KeyCount =0; 4a!L/m *  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 jU4Ir {f  
#pragma data_seg() zcxG%? Q  
S?Eg   
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 9 z3Iwl  
o,aI<5"  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: e;!<3b  
NoKYHN^*w  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR i^QcW!X&  
cKey,UCHAR cMask) (qPZEZKx  
{ %+pXzw`B  
 BOOL bAdded=FALSE; <78> 6u/W%  
 for(int index=0;index<MAX_KEY;index++){ !2{MWj  
  if(hCallWnd[index]==0){ {|rwIRe  
   hCallWnd[index]=hWnd; dDm<'30?*v  
   HotKey[index]=cKey; YDmFR,047  
   HotKeyMask[index]=cMask; 0hNc#x6  
   bAdded=TRUE; .Dx]wv  
   KeyCount++; ||!k 3t#<  
   break; ^8MgNVoJ)  
  } |=h>3Z=r!  
 } `q xg  
 return bAdded; [fW:%!Y'  
} pbgCcO~xm  
//删除热键 HuK'tU#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =%]dk=n?TN  
{ :$}67b)MO  
 BOOL bRemoved=FALSE; Eydk64 5:3  
 for(int index=0;index<MAX_KEY;index++){ lcUL7  
  if(hCallWnd[index]==hWnd){ #a .aD+d'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #vDe/o+=  
    hCallWnd[index]=NULL; Q7Dkh KT  
    HotKey[index]=0; fqF1 - %  
    HotKeyMask[index]=0; Y: byb68  
    bRemoved=TRUE; |20p#]0E+  
    KeyCount--; LXK+WB/s  
    break; Sk1yend4  
   } V'6%G:?0a  
  } G7),!Qol  
 } 5k\61(*s  
 return bRemoved; kwyvd`J8  
} ^T<<F}@q  
#K4wO!d  
_Y~+ #Vc  
  DLL中的钩子函数如下: .79'c%3}  
T %cN(0 @  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i^gzl_!  
{ |5FyfDaFBX  
 BOOL bProcessed=FALSE; ^(6.M\Q  
 if(HC_ACTION==nCode) ml3]CcKn  
 { H7\EvIM=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ;ga~ae=Fg  
   switch(wParam) RWoa'lnu  
   {  C"F(kgL  
    case VK_MENU: 8<g5.$xyz  
     MaskBits&=~ALTBIT; #cmj?y()  
     break; 7,(:vjIXd  
    case VK_CONTROL: ].Et&v  
     MaskBits&=~CTRLBIT; k@wxN!w;  
     break; zb9$  
    case VK_SHIFT: 7%?A0%>6G  
     MaskBits&=~SHIFTBIT; y t<K!=7&  
     break; ^ 5UIbA(  
    default: //judge the key and send message icnp^2P  
     break; $:<KG&Br  
   } #=zh&`  
   for(int index=0;index<MAX_KEY;index++){ U9;AU] A  
    if(hCallWnd[index]==NULL) Uq[NO JC  
     continue; H>W A?4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p oNQ<ijK  
    { l$zM|Z1wR`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); PVU(R J  
     bProcessed=TRUE; g@S"!9[;U  
    } G_X'd  
   } ci*Z9&eS+  
  } X"[c[YT!%[  
  else if((lParam&0xc000ffff)==1){ //有键按下 >Ks|yNJ  
   switch(wParam) TYB^CVSZ  
   { P [gqv3V  
    case VK_MENU: D+k5e=  
     MaskBits|=ALTBIT; scA&:y  
     break; pET5BMxGG  
    case VK_CONTROL: 8-po|  
     MaskBits|=CTRLBIT; PR.?"$!D{  
     break; %+`$Lb?{  
    case VK_SHIFT: XRaq\a`=:  
     MaskBits|=SHIFTBIT; $_<,bC1[  
     break; QZd ,GY5{  
    default: //judge the key and send message @y}1%{,%  
     break; h"q`gj  
   } ymzlRs1^Ct  
   for(int index=0;index<MAX_KEY;index++){ N.3M~0M*  
    if(hCallWnd[index]==NULL) }9@ ,EEhg  
     continue; j4Lf6aUOX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y=q\1~]Z  
    { )TV'eq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); QDyL0l{C  
     bProcessed=TRUE; nC2A&n&>  
    } :}j{NM#  
   } IF@)L>-%  
  } Rb\\6 BU0  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 (uRAK  
   for(int index=0;index<MAX_KEY;index++){ {HQ?  
    if(hCallWnd[index]==NULL) NPKRX Li%  
     continue; `F(KM '  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^ b}_[B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +]Ydf^rF  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 NbfV6$jo  
   } *R8q)Q  
  } qM]eK\q 1  
 } ?mrG^TV^+r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /Wk\ 6  
} 5H>[@_u+:  
l*/I ; a$  
  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: @@_f''f$  
{3!v<CY'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `|Tr"xavf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k%Jw S_F  
JZN'U<R  
  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: 41,Mt  
W}nD#9tL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $I+QyKO9k  
{ HPm12&8,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) C:zK{+  
 { @ Al\:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 hesL$Z [  
  SaveBmp(); ^P\(IDJCo  
  return FALSE; ?r#e  
 } jsc1B  
 …… //其它处理及默认处理 .J'}qkz~  
} X >C*(/a  
 Wu9@Ecb  
Al6)$8]e   
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 oJ>]=^?k  
%Q rf ]  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 A2g +m  
g!cTG-bh>J  
  二、编程步骤 TDk'  
iIA&\'|;i  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; $_% a=0  
,;hI yT  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Z6A*9m  
]xfu @''  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; &8z`]mB{t  
n<uF9N<   
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; U"af3c^2  
9JpPas$]  
  5、 添加代码,编译运行程序。 iLNKC'  
JZ]4?_l  
三、程序代码 OT&J OTk\  
hK&jo(V  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL DHd9yP9-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C /\)-^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ iE!\)7y  
#if _MSC_VER > 1000 G!uoKiL  
#pragma once g,r'].Jg  
#endif // _MSC_VER > 1000 fOtL6/?  
#ifndef __AFXWIN_H__ 8:|F'{<<b  
#error include 'stdafx.h' before including this file for PCH AK} wSXF  
#endif 6 `+dP"@  
#include "resource.h" // main symbols 1c8 J yp  
class CHookApp : public CWinApp S{7A3 x'B  
{ k$j>_U? P  
 public: y}FTLX $  
  CHookApp(); tQ&.;{5[f  
  // Overrides >A;Mf*E  
  // ClassWizard generated virtual function overrides CMI%jyiX  
  //{{AFX_VIRTUAL(CHookApp)  bF0 y`  
 public: 4%0eX]  
  virtual BOOL InitInstance(); #ih(I7prH  
  virtual int ExitInstance(); GBFYa6\4sT  
  //}}AFX_VIRTUAL Xk8+m>   
  //{{AFX_MSG(CHookApp) esIE i!d  
  // NOTE - the ClassWizard will add and remove member functions here. (:4N#p  
  // DO NOT EDIT what you see in these blocks of generated code ! uK2MC?LP  
  //}}AFX_MSG b*\K I  
  DECLARE_MESSAGE_MAP() ]<V[H  
}; ~D PjTR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); @bSxT,2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {m.l{<H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yF8 av=<{  
BOOL InitHotkey(); K*xqQ]&  
BOOL UnInit(); P4-`<i]!S  
#endif q;3.pRw(  
N0,wT6.  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BxS\ "W  
#include "stdafx.h" ]Nz~4ebB  
#include "hook.h" 0GK<l  
#include <windowsx.h> <Wn={1Ts"  
#ifdef _DEBUG =* oFs|v  
#define new DEBUG_NEW zxTcjC)y  
#undef THIS_FILE ^2rNty,nH  
static char THIS_FILE[] = __FILE__; s`B]+  
#endif CkKr@.dV  
#define MAX_KEY 100 ~ODm?k  
#define CTRLBIT 0x04 g"Mqh!{ FI  
#define ALTBIT 0x02 WwG78b-OA  
#define SHIFTBIT 0x01 Ri=>evx  
#pragma data_seg("shareddata") q\cH+n)C  
HHOOK hHook =NULL; s<Px au+A  
UINT nHookCount =0; =i O K($  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey '/trM%<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B"rnSui  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey yV,ki^^  
static int KeyCount =0; {4SwCN /  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift {7.."@Ob<v  
#pragma data_seg() tpOMKh.`  
HINSTANCE hins; O$%M.C'  
void VerifyWindow(); $O9Nprf  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) EnnT)qos  
//{{AFX_MSG_MAP(CHookApp) YBqu7&  
// NOTE - the ClassWizard will add and remove mapping macros here. ,5$V;|  
// DO NOT EDIT what you see in these blocks of generated code! {/#^v?,  
//}}AFX_MSG_MAP 9JYrP6I!_  
END_MESSAGE_MAP() ~w_4 nE  
bw\fKZ  
CHookApp::CHookApp() &MKG#Y}  
{ 1D%3|_id^  
 // TODO: add construction code here, 5 0uYU[W  
 // Place all significant initialization in InitInstance M0zJGIT~b  
} t{Ck"4Cg  
2#:/C:  
CHookApp theApp; (C>FM8$J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ErIAS6HS'  
{ U ]jHe  
 BOOL bProcessed=FALSE; KE!aa&g  
 if(HC_ACTION==nCode) `@1y|j:m  
 { PLD6Ug  
  if((lParam&0xc0000000)==0xc0000000){// Key up QWz5iM  
   switch(wParam) a$H*C(wL  
   { D;VQoO  
    case VK_MENU: &/R`\(hEA  
     MaskBits&=~ALTBIT; {\3k(NdEX  
     break; /I&Hq7SW`  
    case VK_CONTROL: `B'*ln'r5  
     MaskBits&=~CTRLBIT; $8zsqd 4?  
     break; G|MjKe4}  
    case VK_SHIFT: ^K*uP^B=  
     MaskBits&=~SHIFTBIT; BB@I|)9O(  
     break; .@KpN*`KH  
    default: //judge the key and send message golr,+LSo  
     break; C%_^0#8-0  
   } Ww-%s9N<  
   for(int index=0;index<MAX_KEY;index++){ 5{/CqUIl  
    if(hCallWnd[index]==NULL) XHU&ix{Od  
     continue; hiO:VA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _yk} [x0>  
    { M0VC-\W7f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H EdOo~/~  
     bProcessed=TRUE; hp=TWt~  
    } m}/LMY  
   } B w?Kb@  
  } v|uY\Z  
  else if((lParam&0xc000ffff)==1){ //Key down tVVnQX  
   switch(wParam) FdwT  
   { pn3f{fQ  
    case VK_MENU: Hbwjs?Vq?]  
     MaskBits|=ALTBIT; Q M7z .  
     break; -wv5c  
    case VK_CONTROL: C$Pe<C#  
     MaskBits|=CTRLBIT; 2ED^uc: 0S  
     break; %{qJkjG  
    case VK_SHIFT: NJK?5{H'  
     MaskBits|=SHIFTBIT; .I\)1kjX  
     break; hDa I@_86  
    default: //judge the key and send message / !J1}S  
     break; v l59|W6  
   } b*$/(2"m  
   for(int index=0;index<MAX_KEY;index++) ~3-2Iu^F  
   { yem*g1  
    if(hCallWnd[index]==NULL) NCbl|v=  
     continue; 7 +A-S9P)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )P4#P2  
    { Vfew )]I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); D~_|`D5WK  
     bProcessed=TRUE; `s74g0h  
    } iC- ?F cA  
   } 5c6CH k`:  
  } GBOz,_pw  
  if(!bProcessed){ $[9,1.?C  
   for(int index=0;index<MAX_KEY;index++){ p_h)|*W{  
    if(hCallWnd[index]==NULL) +9Z RCmV  
     continue; d.y2`wT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eveGCV;@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]}z;!D>  
   } @?ntMh6  
  } [P#^nyOh(  
 } N_S>%Z+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); LL3RC6;e  
} G#n99X@-  
86d *  
BOOL InitHotkey() JHpoW}7QB  
{ pL`snVz  
 if(hHook!=NULL){ 2{naSiaq  
  nHookCount++; 0_JbE  
  return TRUE; 7s:`]V%  
 } }G n2%  
 else AU1P?lk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); L8-  
  if(hHook!=NULL) _nu %`?Va  
   nHookCount++; N!6{c~^  
  return (hHook!=NULL); G#V5E)Dx  
} w`XwW#!}@$  
BOOL UnInit() Yo0%5 noz  
{ 7Cf%v`B4D  
 if(nHookCount>1){ FI@2K M  
  nHookCount--; 6S?a57;&W  
  return TRUE; ^Q8m) 0DP  
 } p '{ `Uvr  
 BOOL unhooked = UnhookWindowsHookEx(hHook); G3QB Rh{  
 if(unhooked==TRUE){ pJ7wd~wF*  
  nHookCount=0; B.fLgQK0  
  hHook=NULL; FxOhF03\=[  
 } Bu?"b=B*  
 return unhooked; 9R.IYnq  
} (?-5p;  
wqo2iRql  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?QO)b9  
{ Re?sopg0r  
 BOOL bAdded=FALSE; @(.?e<  
 for(int index=0;index<MAX_KEY;index++){ YN 4P >d  
  if(hCallWnd[index]==0){  01I5,Dm  
   hCallWnd[index]=hWnd;  N3^pFy`  
   HotKey[index]=cKey; #|*;~:fz  
   HotKeyMask[index]=cMask; }8Wp X2U  
   bAdded=TRUE; #r 1 $=GY  
   KeyCount++; z79L2lJn  
   break; |7WzTz  
  } &|<~J (L;  
 } .UbmU^y|  
 return bAdded; vj0`[X   
} j}8IT  
/1++ 8=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X?$Eb  
{ AG) N^yd  
 BOOL bRemoved=FALSE; [:$j<}UmB  
 for(int index=0;index<MAX_KEY;index++){ /b@0HL?  
  if(hCallWnd[index]==hWnd){ >K#Z]k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Jl3l\I'  
    hCallWnd[index]=NULL; !7J;h{3Uw  
    HotKey[index]=0; Z91gAy^z<  
    HotKeyMask[index]=0; FM9b0qE  
    bRemoved=TRUE; W#'c6Hq2c  
    KeyCount--; a AYO(;3  
    break; (omdmT%D  
   } r5[om$|*  
  } C|"T!1MlY4  
 } ,G1|] ~  
 return bRemoved; q ,d]i/T  
} xt +fu L  
i2b\` 805  
void VerifyWindow() ;nj'C1  
{ )Y~q6D K  
 for(int i=0;i<MAX_KEY;i++){ y<PPO6u7  
  if(hCallWnd!=NULL){ d T/*O8  
   if(!IsWindow(hCallWnd)){ &nn!{S^  
    hCallWnd=NULL; ,: w~-   
    HotKey=0; [K13Jy+  
    HotKeyMask=0; O89<IXk  
    KeyCount--; g2C-)*'{yh  
   } `ZN@L<I6  
  } =Z/'|;Vd_x  
 } +YT/od1t7  
} 6N.mSnp  
0]8+rWp|Nz  
BOOL CHookApp::InitInstance() FVG|5'V^  
{ 3leg,q d  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^w2n  
 hins=AfxGetInstanceHandle(); Pb} &c  
 InitHotkey(); `(;d+fof  
 return CWinApp::InitInstance(); A4';((OXy  
} V]H<:UE  
PGT!HdX#{  
int CHookApp::ExitInstance() Tv3ZNh  
{ 3D\.S j%  
 VerifyWindow(); 9b]*R.x:$&  
 UnInit(); ~QBf78@Gf  
 return CWinApp::ExitInstance(); k;zb q  
} 0x# 6L  
b9|F>3?r>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^1,]?F^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \+GXUnkj  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )2YU|  
#if _MSC_VER > 1000 \Qk:\aLR  
#pragma once %9mB4Fc6b)  
#endif // _MSC_VER > 1000 B>X+eK  
1sc #!^Oo  
class CCaptureDlg : public CDialog mm#U a/~1u  
{ &%u,b~cL?  
 // Construction c}Z,xop<P{  
 public: rA*,)I_v@  
  BOOL bTray; s>~&: GUwR  
  BOOL bRegistered; 9[T#uh!DC  
  BOOL RegisterHotkey(); JPQ02&e  
  UCHAR cKey; Xki/5roCQ|  
  UCHAR cMask; (/"T=`3t  
  void DeleteIcon(); q*{"6"4(  
  void AddIcon(); UMhM8m!=o  
  UINT nCount; w?M*n<) O  
  void SaveBmp(); +\Q6Onqr  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .E;6Xx_+r  
  // Dialog Data od^ha  
  //{{AFX_DATA(CCaptureDlg) jn}6yXB  
  enum { IDD = IDD_CAPTURE_DIALOG }; }r^MXv~(  
  CComboBox m_Key; I]SR.Yp%  
  BOOL m_bControl;  vA`[#(C  
  BOOL m_bAlt; 5 @[%P=  
  BOOL m_bShift; }f&7<E  
  CString m_Path; )CR8-z1`  
  CString m_Number; Ur&: Rr  
  //}}AFX_DATA #s yP=  
  // ClassWizard generated virtual function overrides HqYaQ~Dth  
  //{{AFX_VIRTUAL(CCaptureDlg) y_$^Po  
 public: L6 _Sc-sU  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ;k/0N~  
 protected: P\zi:]h[Gh  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n+uq|sYVa  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )1x333.[c  
  //}}AFX_VIRTUAL 0l 3RwWj  
  // Implementation /-|xxy  
 protected: $ @1&G~x  
  HICON m_hIcon; `SW`d<+L  
  // Generated message map functions eHnC^W}|s  
  //{{AFX_MSG(CCaptureDlg) MeplM$9  
  virtual BOOL OnInitDialog(); {{EQM +  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q6_1`Ew  
  afx_msg void OnPaint(); #UWQ (+F  
  afx_msg HCURSOR OnQueryDragIcon(); ;'o>6I7Ph  
  virtual void OnCancel(); ?N|PgNu X  
  afx_msg void OnAbout(); @XIwp2A{+  
  afx_msg void OnBrowse(); '.kbXw0}  
  afx_msg void OnChange(); yp*kMC,3  
 //}}AFX_MSG ?,%N?  
 DECLARE_MESSAGE_MAP() HYg _{  
}; _R-#I  
#endif HKxrBQr78  
UVI=&y]c,p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "R9kF-  
#include "stdafx.h" H`io|~Q  
#include "Capture.h" fZ %ZV  
#include "CaptureDlg.h" HPCA,*YR`  
#include <windowsx.h> JK_$A;Q  
#pragma comment(lib,"hook.lib") &P+cTN9)  
#ifdef _DEBUG 4P:vo$Cy  
#define new DEBUG_NEW hR`dRbBi%  
#undef THIS_FILE R>0ta  Q  
static char THIS_FILE[] = __FILE__; ?1412Tq5  
#endif ?5GjH~  
#define IDM_SHELL WM_USER+1 *@BBlkcx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (Q&z1XK3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); /:USpuu  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [FCNW0NV  
class CAboutDlg : public CDialog Bf* F ^  
{ SfR!q4b=  
 public: pEaH^(I*  
  CAboutDlg(); 0>?mF]M  
  // Dialog Data ~~fL`"  
  //{{AFX_DATA(CAboutDlg) WYzY#-j  
  enum { IDD = IDD_ABOUTBOX }; e4`KnHsL  
  //}}AFX_DATA QB@*/Le   
  // ClassWizard generated virtual function overrides rU~"A  
  //{{AFX_VIRTUAL(CAboutDlg) jyT(LDsS  
 protected: >C&!# 3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?41| e+p  
  //}}AFX_VIRTUAL >qgBu_  
  // Implementation  OB^  
 protected: &a(w0<  
  //{{AFX_MSG(CAboutDlg) x p$0J<2  
  //}}AFX_MSG eo,]b1C2n  
  DECLARE_MESSAGE_MAP() . LS.Z 4@  
}; mcR!P~"i  
4{Ak|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) pucHB<R@bL  
{ V('b|gsEo  
 //{{AFX_DATA_INIT(CAboutDlg) 0ib 6}L%  
 //}}AFX_DATA_INIT p,0 \NUC  
} 7yj2we  
v m$v[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zld>o3K}  
{  _HL3XT  
 CDialog::DoDataExchange(pDX); v|'N|k l  
 //{{AFX_DATA_MAP(CAboutDlg) {38aaf|'/  
 //}}AFX_DATA_MAP 7xcYM  
} qqAsh]Z  
@]7\.>)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ynd}w G'  
 //{{AFX_MSG_MAP(CAboutDlg) L7b{H2 2  
 // No message handlers @Uu\x~3y  
 //}}AFX_MSG_MAP y7Ub~q U  
END_MESSAGE_MAP() ZN1p>+oY!  
}B.C#Y$@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +Q9HsfX/  
: CDialog(CCaptureDlg::IDD, pParent) 2U+&F'&Q  
{ [/kO >  
 //{{AFX_DATA_INIT(CCaptureDlg) >*(>%E~H  
  m_bControl = FALSE; M]{!Nx  
  m_bAlt = FALSE; . =5Jpo  
  m_bShift = FALSE; %In"Kh*  
  m_Path = _T("c:\\"); h=tY 5]8  
  m_Number = _T("0 picture captured."); GhT7:_r~  
  nCount=0; th<]L<BP/  
  bRegistered=FALSE; FSB$D)4z>b  
  bTray=FALSE; !(~>-;A8  
 //}}AFX_DATA_INIT aD^MoB3  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 g:)v thOs  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); +Oscy-;  
} e{O5y8,  
2n=;"33%a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {V&7JZl,/  
{ i@6 /#  
 CDialog::DoDataExchange(pDX); .G]# _U  
 //{{AFX_DATA_MAP(CCaptureDlg) gdT_kb5HL8  
  DDX_Control(pDX, IDC_KEY, m_Key); {3R ax5Ty  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u0e#iX  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Rb0{t[IU  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); LKZI@i)  
  DDX_Text(pDX, IDC_PATH, m_Path); }X?*o `sW  
  DDX_Text(pDX, IDC_NUMBER, m_Number); aVb]H0  
 //}}AFX_DATA_MAP /%c^ i!=f"  
} +NY4j-O  
`3KprpE8v  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) L_r & 'B  
//{{AFX_MSG_MAP(CCaptureDlg) CvJm7c  
 ON_WM_SYSCOMMAND() N'1~wxd  
 ON_WM_PAINT() :&%;s*-9  
 ON_WM_QUERYDRAGICON() #Q"vwek  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Hn~1x'$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6b|`[t  
 ON_BN_CLICKED(ID_CHANGE, OnChange) E~P 0}'  
//}}AFX_MSG_MAP $5IrM 7i  
END_MESSAGE_MAP() !O-+ h0Z  
@FV;5M:I  
BOOL CCaptureDlg::OnInitDialog() v\eBL&WK  
{ 8iNAs#s  
 CDialog::OnInitDialog(); o~K2K5I  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); E0Djo'64  
 ASSERT(IDM_ABOUTBOX < 0xF000); $yAfs3/%)s  
 CMenu* pSysMenu = GetSystemMenu(FALSE); QFPx4F7(e  
 if (pSysMenu != NULL) c v 9 6F  
 { >N J$ac  
  CString strAboutMenu; Wd AGZUp  
  strAboutMenu.LoadString(IDS_ABOUTBOX); SS~Q;9o  
  if (!strAboutMenu.IsEmpty()) u^9c`  
  { w!RH*S  
   pSysMenu->AppendMenu(MF_SEPARATOR); .7FI%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); "BRE0Ir:  
  } ,LZ:y1z'V-  
 } a AM UJk  
 SetIcon(m_hIcon, TRUE); // Set big icon MDP MOA  
 SetIcon(m_hIcon, FALSE); // Set small icon OpLSjr  
 m_Key.SetCurSel(0); E'8Bw7Tz  
 RegisterHotkey(); <T[N.mB  
 CMenu* pMenu=GetSystemMenu(FALSE); zf~zYZSr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t] wM_]+  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); to 6Q90(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); y7OG[L/  
 return TRUE; // return TRUE unless you set the focus to a control &*aU2{,s,;  
} T6$<o\g'  
cloI 6%5r  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~PnpYd<2  
{ EC'bgFe  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX)  uN 62>  
 { %ZyPK,("  
  CAboutDlg dlgAbout; 1,QZnF!.x  
  dlgAbout.DoModal(); 29^bMau)v  
 } 3L?a4,Q"k}  
 else GuWBl$|+b  
 { fm>K4\2  
  CDialog::OnSysCommand(nID, lParam); y Xx62J  
 } e,&%Z  
} QtQ^"d65  
;;!{m(;LS}  
void CCaptureDlg::OnPaint() :, [ !8QP  
{ 8 -;ZPhN&  
 if (IsIconic()) ~iZF~PQ1_  
 { ;/ KF3 %  
  CPaintDC dc(this); // device context for painting "NH+qQhs  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7RE6y(V1  
  // Center icon in client rectangle vw] D{OBv*  
  int cxIcon = GetSystemMetrics(SM_CXICON); tQ JH'YV  
  int cyIcon = GetSystemMetrics(SM_CYICON); X#,[2&17Fh  
  CRect rect; 7 afA'.=  
  GetClientRect(&rect); NB5B$q_'#  
  int x = (rect.Width() - cxIcon + 1) / 2; #.+*G`m  
  int y = (rect.Height() - cyIcon + 1) / 2; XhAcC  
  // Draw the icon }]+}Tipd  
  dc.DrawIcon(x, y, m_hIcon); >5Oy^u6Ly  
 } sFCs_u1tNN  
 else V C'-h~  
 { !a(qqZ|s  
  CDialog::OnPaint(); 0Y*gJ!a  
 } |~LjH|*M  
} BC{J3<0bf@  
5qQ(V)ah  
HCURSOR CCaptureDlg::OnQueryDragIcon() vC<kpf!  
{ ]#q7}Sd  
 return (HCURSOR) m_hIcon; )^S^s >3  
} u6I0<i_KZ  
:YXQ9/iRr  
void CCaptureDlg::OnCancel() Qfu*F}  
{ 2G5!u)  
 if(bTray) <VR&= YJ  
  DeleteIcon(); G!LNP&~  
  CDialog::OnCancel(); j_uY8c>3\q  
} PB<Sc>{U  
N|d.!Q;V.y  
void CCaptureDlg::OnAbout() a 8hv.43  
{ n;^k   
 CAboutDlg dlg; lEb R)B,  
 dlg.DoModal(); *Gh8nQbh  
} 1qKxg  
k>;r9^D  
void CCaptureDlg::OnBrowse() i -s?"Fk  
{ W<N QU f[=  
 CString str; 'A(-MTd%  
 BROWSEINFO bi; \ Q8q9|g?]  
 char name[MAX_PATH]; p z+}7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1\J1yOL  
 bi.hwndOwner=GetSafeHwnd(); }:l%,DBw  
 bi.pszDisplayName=name; 5YG@[ic  
 bi.lpszTitle="Select folder"; K<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; C+]q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); x*"pDI0k)  
 if(idl==NULL) pkV\D  
  return; K^& ]xFW  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); .'{6u;8  
 str.ReleaseBuffer(); ID).*@(I"  
 m_Path=str; GlgORy=>  
 if(str.GetAt(str.GetLength()-1)!='\\') +JAfHQm-  
  m_Path+="\\"; VBsFT2XiL  
 UpdateData(FALSE); b:5%}  
} [xs)u3b  
QRZTT qG  
void CCaptureDlg::SaveBmp() 9Glfi@.  
{ O{cGk: y  
 CDC dc; l)rvh#D  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9k+&fyy  
 CBitmap bm; (T#(A4:6S  
 int Width=GetSystemMetrics(SM_CXSCREEN); vl{_M*w ;  
 int Height=GetSystemMetrics(SM_CYSCREEN); m57tO X  
 bm.CreateCompatibleBitmap(&dc,Width,Height); OG?j6q hpl  
 CDC tdc; ];{l$-$$  
 tdc.CreateCompatibleDC(&dc); O$umu_  
 CBitmap*pOld=tdc.SelectObject(&bm); L!b0y7yR  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %=mwOoMk0L  
 tdc.SelectObject(pOld); C|~JPcl  
 BITMAP btm; "K$Wh1<7  
 bm.GetBitmap(&btm); %f> |fs  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [cL U*:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =.f +}y  
 BITMAPINFOHEADER bih; >5~Zr$  
 bih.biBitCount=btm.bmBitsPixel; iI@Gyq=  
 bih.biClrImportant=0; z2nUul(2  
 bih.biClrUsed=0; ;'Vipj   
 bih.biCompression=0; CMxjX  
 bih.biHeight=btm.bmHeight; qfP"UAc{/  
 bih.biPlanes=1; seqF84Xd<  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7k#${,k  
 bih.biSizeImage=size; xX&>5 "  
 bih.biWidth=btm.bmWidth; ,ORG"]_F  
 bih.biXPelsPerMeter=0; zr;Y1Xt4  
 bih.biYPelsPerMeter=0; rb}wv16?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 23\j1?  
 static int filecount=0; l;{N/cS  
 CString name; NtA|#"^  
 name.Format("pict%04d.bmp",filecount++); $6&GAJe  
 name=m_Path+name; z Jo#3  
 BITMAPFILEHEADER bfh; e"s{_V  
 bfh.bfReserved1=bfh.bfReserved2=0; w{zJE]7  
 bfh.bfType=((WORD)('M'<< 8)|'B'); C`th^dqBV  
 bfh.bfSize=54+size; B:A1W{l  
 bfh.bfOffBits=54; qp~4KukL  
 CFile bf; Sv ~1XL W  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2c>H(t h=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Q!2iOvK  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); JPTI6"/  
  bf.WriteHuge(lpData,size); [cTRz*\s  
  bf.Close(); sAjKf\][  
  nCount++; $G-N0LV  
 } N9JgV,`  
 GlobalFreePtr(lpData); Xx y Bg!R  
 if(nCount==1) & L.PU@  
  m_Number.Format("%d picture captured.",nCount); XC/]u%n8](  
 else X\3 ,NR,  
  m_Number.Format("%d pictures captured.",nCount); X.T\=dm%v  
  UpdateData(FALSE); =6Kv`  
} =S[FJaIu7  
rMXOwkE  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /!{A=N  
{ +Sdx8 Z5  
 if(pMsg -> message == WM_KEYDOWN) =FD`A#\C~  
 { ReB(T7Vk=  
  if(pMsg -> wParam == VK_ESCAPE) gM;)  
   return TRUE; Q&.IlVB[  
  if(pMsg -> wParam == VK_RETURN) gGI#QPT`X  
   return TRUE; @^:7UI_  
 } Z*)y.i`  
 return CDialog::PreTranslateMessage(pMsg); r_V2 J{B  
} EYJi6#  
Ot2zhR )  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 94'k 7_q  
{ )S wG+k,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ V$Xl^#tN  
  SaveBmp(); /:Z~"Q*r  
  return FALSE; Ah"'hFY  
} 4*D fI  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Kixr6\  
 CMenu pop; N&x WHFn]C  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); DQ n`@  
 CMenu*pMenu=pop.GetSubMenu(0); )ZgER[  
 pMenu->SetDefaultItem(ID_EXITICON); x8pbO[_|  
 CPoint pt; S`W'G&bCj  
 GetCursorPos(&pt); a$xeiy9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iKF$J3a\2f  
 if(id==ID_EXITICON) I", &%0ycm  
  DeleteIcon(); [ n0##/  
 else if(id==ID_EXIT)  [`hE^chd  
  OnCancel(); {#w A !>.  
 return FALSE; 6m-:F.k1(  
} rt3f7 s*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); f- k|w%R@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) { /F rs*AF  
 AddIcon(); OZ>)sL  
 return res; u6iU[5  
} 56bud3CVs  
EZ%w=  
void CCaptureDlg::AddIcon() *793H\  
{ T]Tdx.B  
 NOTIFYICONDATA data; fd5ZaE#f  
 data.cbSize=sizeof(NOTIFYICONDATA); H4 }%;m%  
 CString tip; HvqF@/xh  
 tip.LoadString(IDS_ICONTIP); E VN-<=i^  
 data.hIcon=GetIcon(0); j]!7BHC  
 data.hWnd=GetSafeHwnd(); +&7[lsD*  
 strcpy(data.szTip,tip); RVgPH<1X@e  
 data.uCallbackMessage=IDM_SHELL; PkPDVv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &*G5J7%w  
 data.uID=98; J8u{K.( *7  
 Shell_NotifyIcon(NIM_ADD,&data); B.}_],  
 ShowWindow(SW_HIDE); tp6csS,  
 bTray=TRUE; c%AFo]H  
} t g KG&  
!cEbz b  
void CCaptureDlg::DeleteIcon() L(WL,xnBy  
{ W.#}q K" q  
 NOTIFYICONDATA data; G%P>A g  
 data.cbSize=sizeof(NOTIFYICONDATA); Hhe{ +W@~  
 data.hWnd=GetSafeHwnd(); ZR;8r Z](  
 data.uID=98; eK Z@ FEZ  
 Shell_NotifyIcon(NIM_DELETE,&data); C%}]"0Q1  
 ShowWindow(SW_SHOW); &dhcKO<4  
 SetForegroundWindow(); %Y cxC0S[  
 ShowWindow(SW_SHOWNORMAL); kf%&d}2to  
 bTray=FALSE; "*++55  
} T3USNc51  
.>mH]/]m  
void CCaptureDlg::OnChange() ]>R`;"(  
{ JmU<y  
 RegisterHotkey(); g.B%#bfg  
} j4~7akG  
m,W) N9 M  
BOOL CCaptureDlg::RegisterHotkey() >lD;0EN  
{ (O)\#%,@R  
 UpdateData(); Q0zW ]a  
 UCHAR mask=0; {fGd:2dh  
 UCHAR key=0; \H Wcd|  
 if(m_bControl) EJf#f  
  mask|=4; :]P~.PD5,  
 if(m_bAlt) _BZ1Vnv  
  mask|=2; CQ6'b,L&   
 if(m_bShift) .]W ;2G  
  mask|=1; ?S (im  
  key=Key_Table[m_Key.GetCurSel()]; h>}ax\h  
 if(bRegistered){ H~A"C'P3#  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); K0w<[CO  
  bRegistered=FALSE; B.89_!/:p  
 } V]I:2k5  
 cMask=mask; ?PBa'g  
 cKey=key; QGs1zfh*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); T>}0) s  
 return bRegistered; Bk?8 zYp  
} T n"e   
,:D=gQ@`  
  四、小结 a}:A,t<6  
v8ba~  
  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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