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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: 3HLNCt09  
   :rHJ4Tl  
  一、实现方法 uJFdbBDSh  
fBRo_CU8!  
  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: 4]h =yc R  
$ et0s;GBv  
#pragma data_seg("shareddata") J)`-+}7$v  
HHOOK hHook =NULL; //钩子句柄 f|h|q_<;  
UINT nHookCount =0; //挂接的程序数目 tSVc|j  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 qQA}Z*( m  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 q*F{/N **  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey dRj|g  
static int KeyCount =0; LV\DBDM  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 GB>QK  
#pragma data_seg() b4E:Wn9x  
u=/{cOJI6  
  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。 _CW(PsfY  
v%"|WV[N  
  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: SnE(o)Q  
4a'N>eDR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR NWM8[dI  
cKey,UCHAR cMask) i\KQ!f>A  
{ T(f/ ?_%  
 BOOL bAdded=FALSE; 0Uo\wyd  
 for(int index=0;index<MAX_KEY;index++){ in~D  
  if(hCallWnd[index]==0){ #9X70|f  
   hCallWnd[index]=hWnd; pPcTrN'  
   HotKey[index]=cKey; Zb1<:[  
   HotKeyMask[index]=cMask; ~~v3p>zRr  
   bAdded=TRUE; {B[=?6tQ  
   KeyCount++; gW-V=LV (  
   break; { jhr<  
  } 8g&? Cc  
 } h{AII  
 return bAdded; cm?\ -[cV  
} ?,& tNP{jq  
//删除热键 W7 Cc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) } \XfH  
{ \~fONBY  
 BOOL bRemoved=FALSE;  /% M/  
 for(int index=0;index<MAX_KEY;index++){ %KmiH ;U  
  if(hCallWnd[index]==hWnd){ 0URji~?|x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |962G1.  
    hCallWnd[index]=NULL; Vm3v-=6  
    HotKey[index]=0; s (zL   
    HotKeyMask[index]=0; MhR:c7,  
    bRemoved=TRUE; S,Xnzrz  
    KeyCount--; dYL"h.x  
    break; )rekY;  
   } #wV8X`g  
  } NdzSz]q}  
 } cUY`97bn  
 return bRemoved; ^~3SSLS4"  
} @ Wd9I;hWv  
i70w rW#k  
&ge "x{,?  
  DLL中的钩子函数如下: yt.F\[1  
ie2WL\tR4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [[;e)SoA  
{ K%^V?NP*{Z  
 BOOL bProcessed=FALSE; X4 A<[&F/  
 if(HC_ACTION==nCode) 4A_[PM  
 { OoA|8!CFa  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 v"#mzd.tW  
   switch(wParam) " N9 <wU  
   {  5 u*-L_  
    case VK_MENU: JV]^zW  
     MaskBits&=~ALTBIT; Yy)tmq  
     break; [%77bv85.G  
    case VK_CONTROL: rEv$+pP  
     MaskBits&=~CTRLBIT; PfC!lI BU  
     break; rvXWcu-"  
    case VK_SHIFT: f!!V${)X  
     MaskBits&=~SHIFTBIT; ^yyC [Mz  
     break; STxKE %l  
    default: //judge the key and send message ;#oie< Vit  
     break; w*oQ["SL  
   } SVO3821  
   for(int index=0;index<MAX_KEY;index++){ RPE5K:P  
    if(hCallWnd[index]==NULL) QA5Qwe L  
     continue; 1:f9J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~%SH3$  
    { v?& -xH-S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6P5Ih  
     bProcessed=TRUE; 1@QZnF5[  
    } YN!>}  
   } ^(|vsFzn  
  } n#wI@W >%+  
  else if((lParam&0xc000ffff)==1){ //有键按下 pO ml8SQf  
   switch(wParam) A7%:05  
   { #ZYVc|sT+  
    case VK_MENU: ?sMP~RHQ  
     MaskBits|=ALTBIT; p' +  
     break; 'J6 M*vO  
    case VK_CONTROL: &8]d }-e  
     MaskBits|=CTRLBIT; ~[\_N\rm  
     break; q^r#F#*1l  
    case VK_SHIFT: yjhf   
     MaskBits|=SHIFTBIT; 8"fD`jtQ  
     break; IuNiEtKx  
    default: //judge the key and send message 2UFv9  
     break; sIK;x]Q)  
   } 49w=XJ  
   for(int index=0;index<MAX_KEY;index++){ .8P.)%  
    if(hCallWnd[index]==NULL) 1. rj'  
     continue; ~fT_8z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,=|ZB4HA  
    { v7DE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); unBy&?&p  
     bProcessed=TRUE; D?0zhU  
    } D,g1<:<  
   } <j5NFJ9  
  } 8'f4 Od ?  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |Tm!VFd  
   for(int index=0;index<MAX_KEY;index++){ Xt#4/>dlR  
    if(hCallWnd[index]==NULL) ~d6DD;`K  
     continue; 8`fjF/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -$WYj "  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R8T] 2?Q1  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QCX8IIHG  
   } ])Qs{hs~s  
  } V 2i@.@$j  
 } dVFf.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k}0^&Quc4  
} FN%m0"/Z{t  
NN1$'"@NL  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: !V,{_(LT  
~I799Xi  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y;AL'vm9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v0ES;  
r?*NhLG ;  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: `A,g] 1C:  
mBG=jI "xh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D>!6,m2  
{ thqS*I'#g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) NKmoG\*  
 { &l?+3$q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 B<~U3b  
  SaveBmp(); DS -fjH\  
  return FALSE; 0K-*WQ*#9  
 } \@;\t7~  
 …… //其它处理及默认处理 '/I:^9  
} n6(.{M;  
^o !O)D-q  
A~dQ\M  
  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。 HSIvWhg?p  
]O:N-Y  
  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。 8V-\e?&^  
 A, PlvI  
  二、编程步骤 1[*{(e  
P &)1Rka  
  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"; e62Dx#IY  
>l+EJ3W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; '?Jxt:<  
"|m|E/Z-9  
  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; o."rxd  
sK 2 e&  
  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; K$ v"Uk  
]p~IYNl2%j  
  5、 添加代码,编译运行程序。 mga6[E<  
w&BGJYI  
三、程序代码 Y?#i{ixX6n  
IF@HzT;Q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL C#w]4$/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1 11D3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g8'DoHJ*  
#if _MSC_VER > 1000 L "<B;u5pM  
#pragma once LihjGkj\g  
#endif // _MSC_VER > 1000 > 4oY3wk8  
#ifndef __AFXWIN_H__ {5%/T,  
#error include 'stdafx.h' before including this file for PCH Yn9j-`  
#endif  0v^:  
#include "resource.h" // main symbols Z v0C@r  
class CHookApp : public CWinApp )uP[!LV[e  
{  l>v{  
 public: k:#6^!b1  
  CHookApp(); m h;X~.98  
  // Overrides XtBMp=7Oa  
  // ClassWizard generated virtual function overrides D*vm cSf  
  //{{AFX_VIRTUAL(CHookApp) \%,&~4 !  
 public: FyG6 !t%  
  virtual BOOL InitInstance(); $gp!w8h  
  virtual int ExitInstance(); @<_`2eW'/R  
  //}}AFX_VIRTUAL ]#<  
  //{{AFX_MSG(CHookApp) LNQSb4  
  // NOTE - the ClassWizard will add and remove member functions here. *rqm8z50a  
  // DO NOT EDIT what you see in these blocks of generated code ! F?Or;p5`Y  
  //}}AFX_MSG U '[?9/T  
  DECLARE_MESSAGE_MAP() S*%iiD)  
}; Xz;b,C&*t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); C4$/?,K(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  r@T| e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -O&"|   
BOOL InitHotkey(); Xy#V Q{!  
BOOL UnInit(); J-J3=JG  
#endif xKp0r1}  
F ,G,b  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Nm8w/Q5D`  
#include "stdafx.h" NcL =z o<  
#include "hook.h" {Iy7.c8S  
#include <windowsx.h> =sQ(iso%f  
#ifdef _DEBUG 2/tb6' =  
#define new DEBUG_NEW \iMyo  
#undef THIS_FILE 2 X<nn  
static char THIS_FILE[] = __FILE__; q|q:: q*  
#endif da*9(!OV  
#define MAX_KEY 100 ;.Zh,cU  
#define CTRLBIT 0x04 /BzA(Ic/  
#define ALTBIT 0x02 T 2bnzI i  
#define SHIFTBIT 0x01 '\*A"8;h  
#pragma data_seg("shareddata") =|y|P80w  
HHOOK hHook =NULL; L+Pc<U)T+  
UINT nHookCount =0; 'TEyP56  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0~xaUM`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $e/*/.  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey hU,$|_WDy  
static int KeyCount =0; |t\KsW  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \:sk9k  
#pragma data_seg() !b%,'fy)  
HINSTANCE hins; 96W4 c]NT  
void VerifyWindow(); N^@ \tg=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) spiDm:Xe  
//{{AFX_MSG_MAP(CHookApp) 9kd.j@C  
// NOTE - the ClassWizard will add and remove mapping macros here. /v&`!nKu  
// DO NOT EDIT what you see in these blocks of generated code! yQS04Bl]  
//}}AFX_MSG_MAP ~'f8L #[M  
END_MESSAGE_MAP() DN|vz}s  
A;%kl`~iyz  
CHookApp::CHookApp() Xr2J:1pgg  
{ L; C|ow^c  
 // TODO: add construction code here, 9`&77+|;e  
 // Place all significant initialization in InitInstance &^ceOV0+  
} &V;x 4  
7Jc<.Z"/Gd  
CHookApp theApp; ^4hc+sh0D  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?W<cB`J  
{ ZPYH#gC& T  
 BOOL bProcessed=FALSE; Ij$)RSPtH  
 if(HC_ACTION==nCode) [Ye5Y?  
 { ~mcZUiP9  
  if((lParam&0xc0000000)==0xc0000000){// Key up Et0&E  
   switch(wParam) j}RM.C\7  
   { Ko-QR(  
    case VK_MENU: *C/KM;&  
     MaskBits&=~ALTBIT; MVuP |&:n  
     break; 3It8&x:  
    case VK_CONTROL: u p~@?t2  
     MaskBits&=~CTRLBIT; n@o  
     break; /p[y1  
    case VK_SHIFT: jrdtd6b}  
     MaskBits&=~SHIFTBIT; }JJ::*W2n  
     break; _pW 'n=}R  
    default: //judge the key and send message E$&;]a  
     break; ]Qy,#p'~&H  
   } (T2<!&0 @  
   for(int index=0;index<MAX_KEY;index++){ DUPmq!A  
    if(hCallWnd[index]==NULL) 4= $!_,.  
     continue; tJG (*   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [sptU3,2U  
    { SOYDp;j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); sK[Nti0  
     bProcessed=TRUE; W -!dMa  
    } 'U*udkn 2]  
   }  z8tt+AU  
  } t3M0La&  
  else if((lParam&0xc000ffff)==1){ //Key down @hBx, `H^  
   switch(wParam) *ig5Q(b*N  
   { n_ OUWvs  
    case VK_MENU: hAYQ6g$A  
     MaskBits|=ALTBIT; ~JT lPU'  
     break; vkh;qPD  
    case VK_CONTROL: rcpvH}N:  
     MaskBits|=CTRLBIT;  MbM :3  
     break; Q,O]x#  
    case VK_SHIFT: d OzO/w&  
     MaskBits|=SHIFTBIT; =I{S;md  
     break; W|FNDP0  
    default: //judge the key and send message lTd+{TF.  
     break; FJ nG<5Rh  
   } H?ieNXP7{  
   for(int index=0;index<MAX_KEY;index++) N/`g?B[  
   { .Pqj6Ko9  
    if(hCallWnd[index]==NULL) ~91uk3ST?  
     continue; pq@$&G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y&~5k;>'_  
    { 9n-RXVL+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); sCuQBZ h  
     bProcessed=TRUE; Y'\3ux0]4'  
    } )bF)RL Z  
   } 6k@[O@)  
  }  \q|e8k4p  
  if(!bProcessed){ %_cg|yy  
   for(int index=0;index<MAX_KEY;index++){ 6eVe}V4W  
    if(hCallWnd[index]==NULL) %pQdq[J={  
     continue; =#J 9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q|m#IVc  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ?yda.<"g9Y  
   } u~j'NOv  
  } |J @|  
 } mvxc[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9p!dQx  
} k0Oc,P`'*  
=W97|BIW,  
BOOL InitHotkey() h?M'7Lti  
{ -uS7~Ww.a  
 if(hHook!=NULL){ e /ppZ>  
  nHookCount++; r5<e}t-  
  return TRUE; rl_1),J\qG  
 } D<$j`r  
 else n$A(6]z5O  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :X]lXock0  
  if(hHook!=NULL) C]{V%jU  
   nHookCount++; |O #wdnYW  
  return (hHook!=NULL); _,Io(QS  
} D z]}@Z*jK  
BOOL UnInit() t~udfOvY  
{ bDcWb2 lqs  
 if(nHookCount>1){ +$Ddd`J'  
  nHookCount--; RJ7/I/yD|  
  return TRUE; xf{C 'uF/  
 } =[O<.'aG-  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FlM.D u  
 if(unhooked==TRUE){ :ok!,QN  
  nHookCount=0; 3w6J V+?  
  hHook=NULL; 0VWCm( f-  
 } }*{\)7g  
 return unhooked; O=9VX  
} QvT-&|  
({}O M=_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tle K (^  
{ 5Rt0h$_J  
 BOOL bAdded=FALSE;  K{7S  
 for(int index=0;index<MAX_KEY;index++){ rVIb'sa  
  if(hCallWnd[index]==0){ lMI ix0sSj  
   hCallWnd[index]=hWnd; [ a65VR~J  
   HotKey[index]=cKey; 9x 6ca  
   HotKeyMask[index]=cMask; 8Y;zs7Y  
   bAdded=TRUE; faKrSmE!  
   KeyCount++; jwtXI\@MS  
   break; y("0Xve  
  } S'H0nJ3  
 } 1\7"I-  
 return bAdded; 'AlSq:gZ  
} |4 d{X@`&  
f T+n-B  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J 6d n~nPK  
{ _<' kzOj  
 BOOL bRemoved=FALSE; x4 A TK  
 for(int index=0;index<MAX_KEY;index++){ O7#}8-@}<u  
  if(hCallWnd[index]==hWnd){ O (sFs1  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {D_4~heF  
    hCallWnd[index]=NULL; vGMOXbq4&  
    HotKey[index]=0; zI*/u)48  
    HotKeyMask[index]=0; qjRiTIp9q  
    bRemoved=TRUE; &#EVE xL  
    KeyCount--; =B 4gEWR  
    break; 5/eS1NJ@  
   } 0m| Gp  
  } [HZCnO|N  
 } ,LW%'tQ~"  
 return bRemoved; J\8l%4q3  
} O|g!Y(  
/dP8F  
void VerifyWindow() S:GUR6g8D  
{ h ?qYy$  
 for(int i=0;i<MAX_KEY;i++){ g)G7 kB/<p  
  if(hCallWnd!=NULL){ 0 ?*I_[Y  
   if(!IsWindow(hCallWnd)){ 7g<`w LAH  
    hCallWnd=NULL; keq[ 6Lv  
    HotKey=0; 0bQiUcg/  
    HotKeyMask=0; Q*J ~wuE2  
    KeyCount--; 9+;f1nV  
   } oG_'<5Bv>  
  } {&j{V-}f  
 } $T%<'=u|E  
} %'~<:>:"E  
Q Fqv,B\<  
BOOL CHookApp::InitInstance() :phD?\!w8t  
{ ";Xbr;N  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _q 9lr8hx  
 hins=AfxGetInstanceHandle(); u0H`%m  
 InitHotkey(); X}QmeY[0I  
 return CWinApp::InitInstance(); l8d%hQVqT  
} pvdZ>D-IU  
Xm[r#IA  
int CHookApp::ExitInstance() fvAV[9/-  
{ Jn[ K0GV  
 VerifyWindow(); - 5Wt9  
 UnInit(); <T% hfW  
 return CWinApp::ExitInstance(); JfINAaboi  
} &,kB7r"  
Q7aDl8Lxn  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $aI MQ[(  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vo<#sa^,j  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l@F e(^5E  
#if _MSC_VER > 1000 qJzK8eW  
#pragma once t-'GRme  
#endif // _MSC_VER > 1000 R;,HtN  
`hf9rjy4  
class CCaptureDlg : public CDialog BRLU&@G`1  
{ a ^/20UFq  
 // Construction j/ IZm)\  
 public: F"P:9`/  
  BOOL bTray; {O oNhN9  
  BOOL bRegistered; %}5"5\Zz  
  BOOL RegisterHotkey(); d7zE8)DU7  
  UCHAR cKey; _qo1 GM&  
  UCHAR cMask; utS M x(  
  void DeleteIcon(); Ph_m'fbf  
  void AddIcon(); #zD+DBTAu  
  UINT nCount; * rANf&y  
  void SaveBmp(); Elk$9 < <  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor H#` ?toS  
  // Dialog Data I}A#*iD  
  //{{AFX_DATA(CCaptureDlg) HON[{Oq  
  enum { IDD = IDD_CAPTURE_DIALOG }; `IQC\DSl/  
  CComboBox m_Key; GV[BpH  
  BOOL m_bControl; Lcb5 9Cs6e  
  BOOL m_bAlt; *,*5sV  
  BOOL m_bShift; G7JZP T  
  CString m_Path; :6iq{XV^  
  CString m_Number;  #7"5Y_0-  
  //}}AFX_DATA Bq8<FZr#!  
  // ClassWizard generated virtual function overrides F RUt}*  
  //{{AFX_VIRTUAL(CCaptureDlg) uCr  
 public: ;.a)r  
  virtual BOOL PreTranslateMessage(MSG* pMsg); },ZL8l{  
 protected: HJrg  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "t`e68{Ls  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =S +:qk  
  //}}AFX_VIRTUAL V-u\TiL  
  // Implementation M<7*\1  
 protected: Bv*h ?`Q  
  HICON m_hIcon; u8=|{)yL  
  // Generated message map functions ^i 7a2< z  
  //{{AFX_MSG(CCaptureDlg) zwHsdB=v  
  virtual BOOL OnInitDialog(); P=z':4,M}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Ms3/P|{"p  
  afx_msg void OnPaint(); <[~M|OL9q,  
  afx_msg HCURSOR OnQueryDragIcon(); .{>-.&  
  virtual void OnCancel(); `-2`UGB-  
  afx_msg void OnAbout(); K)Ka"H  
  afx_msg void OnBrowse(); ArM e[t0$  
  afx_msg void OnChange(); /n=/WGl  
 //}}AFX_MSG $6Psq=|  
 DECLARE_MESSAGE_MAP() !4fL|0  
}; )[.URp&  
#endif eU*h qy?0  
5=e@yIr'#  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^2tCDm5  
#include "stdafx.h" ,)8Hl[y  
#include "Capture.h" d1TG[i<J_  
#include "CaptureDlg.h" wEyh;ID3#  
#include <windowsx.h> $dVjxo  
#pragma comment(lib,"hook.lib") WOoVVjMM  
#ifdef _DEBUG iLei-\w6y  
#define new DEBUG_NEW ymu#u   
#undef THIS_FILE 1+zax*gO-  
static char THIS_FILE[] = __FILE__; ZN/")  
#endif &[xJfL  
#define IDM_SHELL WM_USER+1 )^AO?MW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B{<6 &bQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); n"vI>_|G  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s RB8 jY  
class CAboutDlg : public CDialog N0NMRU]zT  
{ n&lLC&dL  
 public: ~-x\E#(  
  CAboutDlg(); ) Lv{  
  // Dialog Data z841g `:C  
  //{{AFX_DATA(CAboutDlg) bK7DGw`1  
  enum { IDD = IDD_ABOUTBOX }; H>?@nYP  
  //}}AFX_DATA +{&g|V  
  // ClassWizard generated virtual function overrides &0myA_So  
  //{{AFX_VIRTUAL(CAboutDlg) '=xl}v  
 protected: <KCgtO  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dx#N)?  
  //}}AFX_VIRTUAL :.^{!  
  // Implementation TM9>r :j'  
 protected: @g{ " E6  
  //{{AFX_MSG(CAboutDlg) qW9|&GuZ$  
  //}}AFX_MSG .x&>H  
  DECLARE_MESSAGE_MAP() n=~?BxB  
}; `*B8IT)  
snrfHDhUw  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) XT\;2etVL  
{ $J+$ 8pA  
 //{{AFX_DATA_INIT(CAboutDlg) Y?> S.B7  
 //}}AFX_DATA_INIT i''dY!2  
} {^~{X$YI  
3.>jagu  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) uzsR*x%s-  
{ i"r=b%;;  
 CDialog::DoDataExchange(pDX); G|o-C:~  
 //{{AFX_DATA_MAP(CAboutDlg) &#WTXTr0=  
 //}}AFX_DATA_MAP r`lgK2r\  
} bf3)^ 49}  
T_r[#j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E-r/$&D5mP  
 //{{AFX_MSG_MAP(CAboutDlg) i cZQv]  
 // No message handlers "~GudK &  
 //}}AFX_MSG_MAP SN+&'?$WD  
END_MESSAGE_MAP() RgEUTpX  
9t=erhUr  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) J9 /w_,,R$  
: CDialog(CCaptureDlg::IDD, pParent) U5Rzfm4  
{ {C 7=  
 //{{AFX_DATA_INIT(CCaptureDlg) I@.qon2V  
  m_bControl = FALSE; a"~W1|JC"  
  m_bAlt = FALSE; |ek*wo  
  m_bShift = FALSE; h1,J<B@  
  m_Path = _T("c:\\"); "|f;   
  m_Number = _T("0 picture captured."); i`E]gJ$  
  nCount=0; T%Z`:mf  
  bRegistered=FALSE; 7m8L!t9  
  bTray=FALSE; ctj.rC)6n  
 //}}AFX_DATA_INIT )U8F6GIC&}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 fE7Kv_N-%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); L[IjzxUv  
} .3$iOMCH  
K?P.1H`  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ZWYwVAo  
{ Yh"R#  
 CDialog::DoDataExchange(pDX); LM0 TSB?  
 //{{AFX_DATA_MAP(CCaptureDlg) Rb#?c+&#  
  DDX_Control(pDX, IDC_KEY, m_Key); WMrK8e'  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Rnj2Q!C2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 5C/u`{4]Hg  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1w?X~VZAX  
  DDX_Text(pDX, IDC_PATH, m_Path); |`#[jHd  
  DDX_Text(pDX, IDC_NUMBER, m_Number); AX[/S8|6  
 //}}AFX_DATA_MAP =$f xK  
} L{aT"Of{X  
mh|M O(  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) T- JJc#  
//{{AFX_MSG_MAP(CCaptureDlg)  Zuwd(q  
 ON_WM_SYSCOMMAND() 3"%:S_[  
 ON_WM_PAINT() P%.9g  
 ON_WM_QUERYDRAGICON() _)lK.5  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 6VRVk7"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2Ask]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (n#  
//}}AFX_MSG_MAP g`\Vy4w  
END_MESSAGE_MAP() AQ@A$  
L[<MBgF Kv  
BOOL CCaptureDlg::OnInitDialog() /ZX8gR5x  
{ URY%+u  
 CDialog::OnInitDialog(); cND2(< jx:  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >KC*xa"  
 ASSERT(IDM_ABOUTBOX < 0xF000); }?"f#bI  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Z$Qlr:7  
 if (pSysMenu != NULL) wHdq:,0-!  
 { !dGy"-i$h  
  CString strAboutMenu; iQS?LksQX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); m&b!\"0  
  if (!strAboutMenu.IsEmpty()) !j [U  
  { =v1s@5 ;~  
   pSysMenu->AppendMenu(MF_SEPARATOR); vP? "MG  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ^PO0(rh  
  } j @sd x)1+  
 } [BmondOx  
 SetIcon(m_hIcon, TRUE); // Set big icon 2i8'*L+j  
 SetIcon(m_hIcon, FALSE); // Set small icon e$ E=n  
 m_Key.SetCurSel(0); hNSV}~h  
 RegisterHotkey(); -,3Ka:  
 CMenu* pMenu=GetSystemMenu(FALSE); >e"1a/2%>&  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YgrBIul  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); znX2W0V  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *m2J$9q  
 return TRUE; // return TRUE unless you set the focus to a control '0z@Jevd?  
} RwN*/Li  
AgO:"'c  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) dorZ O2Uc  
{ KYd2=P6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) L@9"6&  
 { MX6;ww  
  CAboutDlg dlgAbout; Bu*ge~  
  dlgAbout.DoModal(); (N0G[(>  
 } FtT+Q$q=  
 else WZ;f3 "  
 { $nBzYRc"3  
  CDialog::OnSysCommand(nID, lParam); <wc=SMmO  
 } L0_R2E A  
} !SKEL6~7  
!2$O^ }6"  
void CCaptureDlg::OnPaint() { ~FYiX  
{ zT`LPs6T  
 if (IsIconic()) Z Oyq{w!2  
 { [uW{Ap~2  
  CPaintDC dc(this); // device context for painting YjoN: z`b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); '72ZLdi}-  
  // Center icon in client rectangle 66Huqo  
  int cxIcon = GetSystemMetrics(SM_CXICON); 7[ *,t  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?:~Y%4;  
  CRect rect; 7-Fh!=\f/  
  GetClientRect(&rect); z9u"?vdA  
  int x = (rect.Width() - cxIcon + 1) / 2; 00n6v;X  
  int y = (rect.Height() - cyIcon + 1) / 2; ^1Y0JQ  
  // Draw the icon SP 97Q-  
  dc.DrawIcon(x, y, m_hIcon); e:6R+8s2  
 }  J$v0  
 else l%rwJLN1  
 { } |(KI  
  CDialog::OnPaint(); y`!3Z} 7  
 } A#f@0W:  
} 7.hn@_  
VD<W  
HCURSOR CCaptureDlg::OnQueryDragIcon() *3s4JK  
{ MX xRM~  
 return (HCURSOR) m_hIcon; vn KKK.E  
} Ti=~ycwi  
1#&*xF "  
void CCaptureDlg::OnCancel() I.euuzBgA  
{ K9;pX2^z9  
 if(bTray) qR--lvO  
  DeleteIcon(); #,0%g 1  
  CDialog::OnCancel(); $7T3wv9  
} K\`L>B. 1  
)?:V5UO\  
void CCaptureDlg::OnAbout() ^$4d'  
{ W52AX.Nm  
 CAboutDlg dlg; S=n,unn#t  
 dlg.DoModal(); A_muuOIcI  
} ZYos.ay  
e #> wv]V  
void CCaptureDlg::OnBrowse() 0-oR { {  
{ Mp:tcy,*  
 CString str; -y1%c^36_J  
 BROWSEINFO bi; Ont4-AP   
 char name[MAX_PATH]; Vp  .($  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); s"*zyLUUo  
 bi.hwndOwner=GetSafeHwnd(); XnHcU=~q  
 bi.pszDisplayName=name; S>Z V8  
 bi.lpszTitle="Select folder"; y<.0+YL-e+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *Sm$FMWQ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 82WXgB>  
 if(idl==NULL) hyH"  
  return; Eb7qM.Q] &  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); #joGIw  
 str.ReleaseBuffer(); ;\DXRKR  
 m_Path=str; @kK${  
 if(str.GetAt(str.GetLength()-1)!='\\') 6] <~0{  
  m_Path+="\\"; &B1d+.+  
 UpdateData(FALSE); p6$ QTx  
} {0+gPTp  
TL ;2,@H`  
void CCaptureDlg::SaveBmp() "2o,XF  
{ (%ra~s?  
 CDC dc; %3M(!X:[  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); g4cmYg3  
 CBitmap bm; w4H3($ K  
 int Width=GetSystemMetrics(SM_CXSCREEN); J*Dj`@`4`g  
 int Height=GetSystemMetrics(SM_CYSCREEN); qba<$  
 bm.CreateCompatibleBitmap(&dc,Width,Height); S0eD 2  
 CDC tdc; {}H5%W  
 tdc.CreateCompatibleDC(&dc); I8;pMr6  
 CBitmap*pOld=tdc.SelectObject(&bm); Yv\.QrxPm  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~'2)E/IeV  
 tdc.SelectObject(pOld); <i``#" /  
 BITMAP btm; TMj(y{2  
 bm.GetBitmap(&btm); Nc:, [8{l  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; J?&lpsB3_l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jbcJ\2  
 BITMAPINFOHEADER bih; -g(&5._,ZW  
 bih.biBitCount=btm.bmBitsPixel; <*E{z r&  
 bih.biClrImportant=0; }A3(g$8KR  
 bih.biClrUsed=0; R ,-y  
 bih.biCompression=0; `d2}>  
 bih.biHeight=btm.bmHeight; Z;M]^?  
 bih.biPlanes=1; *Nloa/a&9  
 bih.biSize=sizeof(BITMAPINFOHEADER); jFf2( AR  
 bih.biSizeImage=size; u0`~ |K  
 bih.biWidth=btm.bmWidth; -H5n>j0!{  
 bih.biXPelsPerMeter=0; pV]m6! y&  
 bih.biYPelsPerMeter=0; w-*$gk]   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); r e.chQ6  
 static int filecount=0; Wly-z$\  
 CString name; 1A"h!;0  
 name.Format("pict%04d.bmp",filecount++); v _?0|Ei[  
 name=m_Path+name; o6,$;-?F_  
 BITMAPFILEHEADER bfh; &;S.1tg  
 bfh.bfReserved1=bfh.bfReserved2=0; AD^9?Z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ve#VGlI  
 bfh.bfSize=54+size; NXb_hF  
 bfh.bfOffBits=54; 6Ko[[?Lf[  
 CFile bf; (NK$2A/p  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ aRPgo0,W1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); cf)2GoV>e  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Mk9'  
  bf.WriteHuge(lpData,size); Jy?s'tc  
  bf.Close(); YzJ\< tkp  
  nCount++; (yIl]ZN*  
 } fYU/Jn#  
 GlobalFreePtr(lpData); j_Pt8{[  
 if(nCount==1) &0Yv*,4]  
  m_Number.Format("%d picture captured.",nCount); v1%rlP  
 else 6KC.l}Y*  
  m_Number.Format("%d pictures captured.",nCount); rt)70=  
  UpdateData(FALSE); HTiqErD2_  
} Q/&H3N  
m|!R/,>S4  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 9,wd,,ta  
{ P6V_cw$  
 if(pMsg -> message == WM_KEYDOWN) ,DsqKXSU  
 { >ly`1t1  
  if(pMsg -> wParam == VK_ESCAPE) +ptVAg+  
   return TRUE; "Opk:;.  
  if(pMsg -> wParam == VK_RETURN) x LR 2H>B}  
   return TRUE; WtOpxAq  
 } +M-x*;.  
 return CDialog::PreTranslateMessage(pMsg); S~fURn  
} K0$8t%Z.  
`_Iy8rv:P  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7ukJ\P5[&1  
{ I@IZ1 /J,r  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6' }oo'#~  
  SaveBmp(); )HbsUm#  
  return FALSE; 6Yhd[I3  
} 7pH`"$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {`5Sh1b  
 CMenu pop; a_Y*pOu  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); (#x <qi,T  
 CMenu*pMenu=pop.GetSubMenu(0); )N h67P3X"  
 pMenu->SetDefaultItem(ID_EXITICON); HnU; N S3J  
 CPoint pt; H0<(j(JK  
 GetCursorPos(&pt); G?D7R/0)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /W&Ro5-  
 if(id==ID_EXITICON) C-!!1-Eq?:  
  DeleteIcon(); ^UI{U1N~Bz  
 else if(id==ID_EXIT) Pqiw[+a$  
  OnCancel(); x_Zi^]  
 return FALSE; w@w(AFV9/  
} Sc03vfmo"N  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); KW.*LoO  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \HX'^t`  
 AddIcon(); q SR\=:$  
 return res; y)iT-$bQ  
} wG;#L7%  
^<X+t&!z  
void CCaptureDlg::AddIcon() _GEt:=DAP#  
{ sq `f?tA?  
 NOTIFYICONDATA data; +>3XJlZV  
 data.cbSize=sizeof(NOTIFYICONDATA); On x[}x  
 CString tip; '<! b}1w0  
 tip.LoadString(IDS_ICONTIP); qxS=8#-`(  
 data.hIcon=GetIcon(0); ct,B0(]  
 data.hWnd=GetSafeHwnd(); NA%M)u{|  
 strcpy(data.szTip,tip); `o~ dQb/k+  
 data.uCallbackMessage=IDM_SHELL; %Jy0?WN  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; K.3)m]dCl  
 data.uID=98; `4^-@}  
 Shell_NotifyIcon(NIM_ADD,&data); thG;~ W  
 ShowWindow(SW_HIDE); :|cC7, S  
 bTray=TRUE; 4C@ .X[r  
} Ln6\Iis  
=`RogjbP  
void CCaptureDlg::DeleteIcon() P$LHsg]  
{ =!}n .  
 NOTIFYICONDATA data; hM}rf6B  
 data.cbSize=sizeof(NOTIFYICONDATA); i-1lppI  
 data.hWnd=GetSafeHwnd(); #p'Xq }]  
 data.uID=98; zTA+s 2  
 Shell_NotifyIcon(NIM_DELETE,&data); Vl=!^T}l+  
 ShowWindow(SW_SHOW); @JJ,$ ?  
 SetForegroundWindow(); ,H6*9!Dv2  
 ShowWindow(SW_SHOWNORMAL); SN w3xO!;&  
 bTray=FALSE; k?(x}IZdG  
} Ik{[BRzUgt  
8 MUY  
void CCaptureDlg::OnChange() yX%q7ex  
{ qg521o$*  
 RegisterHotkey(); 5]C}044  
} w-f[h  
=W+ h.?  
BOOL CCaptureDlg::RegisterHotkey() \#1*r'V8  
{ Djv0]Sm^!  
 UpdateData(); P-B3<~*i!  
 UCHAR mask=0; 6T3uv,2  
 UCHAR key=0; O>8|Lc  
 if(m_bControl) }M3f ?Jv  
  mask|=4; oWCy%76@  
 if(m_bAlt) -P I$SA,  
  mask|=2; .KzGb4U  
 if(m_bShift) +7yirp~`K  
  mask|=1; >lyX";X#  
  key=Key_Table[m_Key.GetCurSel()]; lqD.epm  
 if(bRegistered){ ;ZnSWIF2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2t9JiH  
  bRegistered=FALSE; 4k}3^.#  
 } vTrjhTa\  
 cMask=mask; IZr~h9  
 cKey=key; 4<`Qyul-  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); z"cF\F  
 return bRegistered; %BdQ.\4DS  
} \BIa:}9O  
U`{'-L.  
  四、小结 5U%J,W  
e_eNtVq  
  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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