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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: B]o5 HA<k  
  r#xq 8H=_m  
  一、实现方法 /d\#|[S  
)@O80uOFh  
  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: M@=eWZ<  
!\ckUMZ\  
#pragma data_seg("shareddata") ^-yEb\\i  
HHOOK hHook =NULL; //钩子句柄 6ofi8( n[  
UINT nHookCount =0; //挂接的程序数目 tXgsWG?v[H  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 0+]ol:i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 K~ 6[zJ4  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <lBY  
static int KeyCount =0; TC%ENxDR  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %xq/eC7  
#pragma data_seg() ;MH<T6b  
yp}a&Dg  
  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。 BmP!/i_  
+l " z  
  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: v7ShXX:  
OcBK n=8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |H LU5=Y  
cKey,UCHAR cMask) l^B PTg)X@  
{ C{r Sq  
 BOOL bAdded=FALSE; ,W!v0*uxp&  
 for(int index=0;index<MAX_KEY;index++){ >*hY1@N1  
  if(hCallWnd[index]==0){ d0Jaa1b~O  
   hCallWnd[index]=hWnd; SGuLL+|W#8  
   HotKey[index]=cKey; *C (/ 2  
   HotKeyMask[index]=cMask; cM= ? {W7~  
   bAdded=TRUE; |NsrO8H   
   KeyCount++; |@a.dgz,  
   break; /i${[1  
  } ;E"TOC  
 } tocZO  
 return bAdded; ?'@tx4#v\2  
} d1"%sI  
//删除热键 VKjDK$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }52]  
{ a=m7pe ^  
 BOOL bRemoved=FALSE; xTy[X"sJ  
 for(int index=0;index<MAX_KEY;index++){ yMQZulCWE  
  if(hCallWnd[index]==hWnd){ xzqgem`[\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \,b@^W6e>  
    hCallWnd[index]=NULL; X~`<ik{q  
    HotKey[index]=0; <)vjoRv  
    HotKeyMask[index]=0; ]%RX\~Q.4  
    bRemoved=TRUE; K|n$-WDG}  
    KeyCount--; Xlw8> .\  
    break; 6WN1D W  
   } /n9yv  
  } ^,?dk![1Cv  
 } =sR]/XSK  
 return bRemoved; QL<uQ`>(  
} }3"FQ/6C  
 o IUjd  
bR6g^Yf  
  DLL中的钩子函数如下: -27uh  
VeJM=s.y7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %(c5T)B9  
{ @bc=O1vX~;  
 BOOL bProcessed=FALSE; ]7*Z'E  
 if(HC_ACTION==nCode) lO Rym:P  
 { L7_qs+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 qM."W=XVN  
   switch(wParam) _x.<Zc\x  
   {  ~s :M l  
    case VK_MENU: DQ<{FN  
     MaskBits&=~ALTBIT; 8hTtBa  
     break; qMk"i@"  
    case VK_CONTROL: `qNhB\  
     MaskBits&=~CTRLBIT; Ux<2!vh  
     break; tAPr4n!  
    case VK_SHIFT: .3{PgrZ  
     MaskBits&=~SHIFTBIT; #~ :j< =o  
     break; PWwz<AI+  
    default: //judge the key and send message ]w3-No  
     break; !zhg3B# p  
   } DP(JsZ}  
   for(int index=0;index<MAX_KEY;index++){ !L+4YA  
    if(hCallWnd[index]==NULL) #hA]r.  
     continue; AE_7sM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h\jV@g$  
    { wTpjM@F?J|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R::0.*FF  
     bProcessed=TRUE; /``4!jU  
    } *K{-J*   
   } nK@RFU6  
  } ux[h\Tp  
  else if((lParam&0xc000ffff)==1){ //有键按下 rNdeD~\  
   switch(wParam) B{#*PAK=  
   { ,9(=Iu-?1  
    case VK_MENU: EXdx$I=X  
     MaskBits|=ALTBIT; /~,|zz  
     break; J?yNZK$WqN  
    case VK_CONTROL: (1 L9K;  
     MaskBits|=CTRLBIT; 4`x.d  
     break; *r b/BZX{  
    case VK_SHIFT: x6, #Jp  
     MaskBits|=SHIFTBIT; B1EI'<S  
     break; DrG9Kky{  
    default: //judge the key and send message wkO8  
     break; -P+@n)?T6  
   } CaSoR |  
   for(int index=0;index<MAX_KEY;index++){ Ya#,\;dTT  
    if(hCallWnd[index]==NULL) b'D|p/)m0S  
     continue; &a'H vQV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9q?\F  
    { {^r8uKo:~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q8j W&_  
     bProcessed=TRUE; *PXlbb  
    } #~&SkIhBE  
   } $.a4Og2  
  } W[5a'}OV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 >i`V-"x  
   for(int index=0;index<MAX_KEY;index++){ F"3LG"  
    if(hCallWnd[index]==NULL) %0>DjzYt  
     continue; $ BEIG@qG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e{ce \  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2:31J4t-<  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]kJinXHW  
   } sH//*y  
  } B74L/h  
 } C^}2::Qu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c.-/e u^|  
} #].n0[  
_QD##`<  
  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: YLr<^G-v  
aV^wTs#2I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8Z=d+}Gg<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C*;g!~{  
]h(}%fk_  
  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: T-0[P;  
+ _=&7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $ekB+ t:cj  
{ ?2Q9z-$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) tBtG- X2  
 { j@JhxCe1+R  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 uR|?5DK  
  SaveBmp(); 6Un61s  
  return FALSE; mA ^[S.!  
 } \#(3r1(  
 …… //其它处理及默认处理 th@a./h"  
} ^8,Y1r9`$  
X8F@U ^@  
8Ol#-2>k$  
  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。 SF$]{ X  
- P;_j,~U  
  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。 -&PiD  
*z2G(Uac  
  二、编程步骤 '$5.{o`s*1  
a ?LrSk`  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; byj}36LN62  
K`=O!;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; VDCG 5QP6(  
'=|2, H]  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; f0uzoeL<%  
0]x gE  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 2OXcP!\Y  
M YQZqlV  
  5、 添加代码,编译运行程序。 #Y*?k TF  
 8>Y  
三、程序代码 -ZTe#@J  
I~LN)hqdo  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL w\ hl2JTy  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) pYtG%<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }b9"&io  
#if _MSC_VER > 1000 c7$L:  
#pragma once )7U^&I,  
#endif // _MSC_VER > 1000 sSisO?F!Z  
#ifndef __AFXWIN_H__ D& Xh|}2A  
#error include 'stdafx.h' before including this file for PCH q[6tvPfkX  
#endif _ >)+ u  
#include "resource.h" // main symbols P\;L#2n  
class CHookApp : public CWinApp |}~2=r z  
{ 7H$0NMP  
 public: TU6e,G|t  
  CHookApp(); _:hrm%^  
  // Overrides o:H^ L,<Tl  
  // ClassWizard generated virtual function overrides  oCE=!75  
  //{{AFX_VIRTUAL(CHookApp) ' `0kW_'  
 public: Vej [wY-c  
  virtual BOOL InitInstance(); `Yk~2t"V  
  virtual int ExitInstance(); #cB=] (N  
  //}}AFX_VIRTUAL 8dg \_H_  
  //{{AFX_MSG(CHookApp) !.(Kpcrg  
  // NOTE - the ClassWizard will add and remove member functions here. uSZCJ#'G  
  // DO NOT EDIT what you see in these blocks of generated code ! dP>~ExYtm  
  //}}AFX_MSG 6S#Y$2 P  
  DECLARE_MESSAGE_MAP() *R] Ob9X  
}; VR86ok  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); K>=KsG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U} EaV<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^Eu]i  
BOOL InitHotkey(); ;x 9_  
BOOL UnInit(); en"]u,!  
#endif 6#A g^A  
!N\<QRb\q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _zAHN0d  
#include "stdafx.h" wul$lJ?tE  
#include "hook.h" K? ;_T$^K  
#include <windowsx.h> T&M*sydA  
#ifdef _DEBUG $XBn:0U  
#define new DEBUG_NEW tUS)1*{_  
#undef THIS_FILE v'R{lXE  
static char THIS_FILE[] = __FILE__; m5!~PG:_  
#endif }2WscxL  
#define MAX_KEY 100 ~r/"w'dB  
#define CTRLBIT 0x04 /RVy?)hVT#  
#define ALTBIT 0x02 \rXmWzl{  
#define SHIFTBIT 0x01 ~}uv4;0l]  
#pragma data_seg("shareddata") 42`%D  
HHOOK hHook =NULL; ~SI`%^L  
UINT nHookCount =0; !VaKq_W  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey DtXQLL*fl(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $;kFuJF  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey fkLI$Cl  
static int KeyCount =0; (mO{ W   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift j_` [Z  
#pragma data_seg() Y(aEp_kV  
HINSTANCE hins; !+sC'/  
void VerifyWindow(); #6t 4 vJ1  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "r!>p\.0O  
//{{AFX_MSG_MAP(CHookApp) #w%d  
// NOTE - the ClassWizard will add and remove mapping macros here. )7$1Da|.  
// DO NOT EDIT what you see in these blocks of generated code! @DiXe[kI  
//}}AFX_MSG_MAP J1i{n7f=@  
END_MESSAGE_MAP() t)#8r,9c  
f`r o {p  
CHookApp::CHookApp() `pMI @"m  
{ h |Ofi  
 // TODO: add construction code here, a`c#- je  
 // Place all significant initialization in InitInstance 4LG[i}u.N  
} 26SXuFJ@  
j@N z  
CHookApp theApp; CSKOtqKQ)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1D *oXE9Ig  
{ fL0dy[Ch@  
 BOOL bProcessed=FALSE; $Hw w  
 if(HC_ACTION==nCode) D-{;;<nIr`  
 { 'eyzH[l,(  
  if((lParam&0xc0000000)==0xc0000000){// Key up _?]0b7X  
   switch(wParam) %7w=;]ym  
   { U2v;[>=]  
    case VK_MENU: Nk.m$  
     MaskBits&=~ALTBIT; $|kq{@<  
     break; ^Rr!YnEN  
    case VK_CONTROL: <x QvS^|[  
     MaskBits&=~CTRLBIT; zKh^BwhO|X  
     break; o,-p[1b  
    case VK_SHIFT: qPI\Y3ZU  
     MaskBits&=~SHIFTBIT; s9[?{}gd  
     break; UB5CvM28  
    default: //judge the key and send message NCrNlH IF  
     break; pUc N-WA  
   } /+V}.  
   for(int index=0;index<MAX_KEY;index++){ s ;3k#-w  
    if(hCallWnd[index]==NULL) Hw0S/ytY  
     continue; |`T$Iq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =`MxgK +  
    { ae%Bl[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u+5&^"72,  
     bProcessed=TRUE; ?;GbK2\bj  
    } \d'>Ky;GD  
   } ]%%I=r  
  } CP]nk0  
  else if((lParam&0xc000ffff)==1){ //Key down 0W_olnZ  
   switch(wParam) q8m{zSr  
   { WGmXq.  
    case VK_MENU: gGaA;YW1  
     MaskBits|=ALTBIT; O]-)?y/  
     break; F"-u8in`  
    case VK_CONTROL: dd+hX$,  
     MaskBits|=CTRLBIT; ~U;M1>  
     break; Mb!b0  
    case VK_SHIFT: OLH[F  
     MaskBits|=SHIFTBIT; W u C2 LM  
     break; 8O[br@h:5  
    default: //judge the key and send message ;J uBybJb  
     break; #QUQC2P(~  
   } Sg&0a$  
   for(int index=0;index<MAX_KEY;index++) mNII-X G  
   { {yzo#"4Oy  
    if(hCallWnd[index]==NULL) GhJ<L3  
     continue; Y>J$OA:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !:]/MpQ ?  
    { +YJpVxYmZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); HXeX !  
     bProcessed=TRUE; BvnNAi  
    } ;L*Ku'6Mt  
   } +$uQ_ve  
  } .4[\%r\i  
  if(!bProcessed){ ngt?9i;N  
   for(int index=0;index<MAX_KEY;index++){ 9ZD>_a  
    if(hCallWnd[index]==NULL) +^6a$ N  
     continue; whW% c8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) HZawB25{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Y5ZBP?P  
   } l cX'n8/3  
  } >;K!yI?0  
 } J16t&Ha`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @<TC+M5!  
} QmKEl|/{u  
5!s7`w]8*0  
BOOL InitHotkey() zhC#<  
{ rq#\x{l  
 if(hHook!=NULL){ ixvF `S9  
  nHookCount++; 6"oG bte  
  return TRUE; <eh<4_<qF  
 } ?wi^R:2|j  
 else gcA,u)z}R  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); kgb:<{pJ  
  if(hHook!=NULL) 9Ai 3p  
   nHookCount++; {3* Ne /  
  return (hHook!=NULL); 8{- *Q(=/  
} <WiyM[ ep  
BOOL UnInit() V;LV),R?  
{ 1CR)1H  
 if(nHookCount>1){ F"^/R  
  nHookCount--; f-BPT2U+  
  return TRUE; O}-+o1  
 } Q,LDn%+;B*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $=9g,39  
 if(unhooked==TRUE){ A4tb>O M  
  nHookCount=0; <~bvf A=  
  hHook=NULL; 6no&2a|D  
 }  ~LF/wx>  
 return unhooked; BhzcimC)  
} LOEiV  
~]Weyb[ N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V r7L9%/wg  
{ I_s*pT  
 BOOL bAdded=FALSE; Z]SUr`Z  
 for(int index=0;index<MAX_KEY;index++){ M:*)l(  
  if(hCallWnd[index]==0){ `yYYyB[  
   hCallWnd[index]=hWnd; O +u? Y  
   HotKey[index]=cKey; {+^&7JX  
   HotKeyMask[index]=cMask; Rn$TYCO  
   bAdded=TRUE; I]-"Tw  
   KeyCount++; Zs|m_O G  
   break; STL+tLJ  
  } B%I<6E[D  
 } z7s}-w,  
 return bAdded; veAdk9  
} |/%X8\  
E#~J"9k98  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ly-}HW(  
{ AIG5a$}&  
 BOOL bRemoved=FALSE; PVi0|  
 for(int index=0;index<MAX_KEY;index++){ <xlyk/  
  if(hCallWnd[index]==hWnd){ Tl L,dPM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ LlcH#L$  
    hCallWnd[index]=NULL; $ vBFs]h  
    HotKey[index]=0; ?s@=DDB\u  
    HotKeyMask[index]=0; blKF78  
    bRemoved=TRUE; f+%s.[;A  
    KeyCount--; ATF>"Ux  
    break; w\1K.j=>|N  
   } LO;6g~(1  
  } >ra)4huZ  
 } gs(ZJO1 /L  
 return bRemoved; 6J<R;g23R]  
} GGU>={D)  
f_z]kA +H  
void VerifyWindow() T2_b5j3i  
{ Y;{(?0 s  
 for(int i=0;i<MAX_KEY;i++){ Ce:w^P+  
  if(hCallWnd!=NULL){ X- j@#Qb  
   if(!IsWindow(hCallWnd)){ Z_4|L+i<{  
    hCallWnd=NULL; avY<~-44B  
    HotKey=0; eyuQ}R  
    HotKeyMask=0; 7 &iav2q  
    KeyCount--; wln"g,ct  
   } 1b<[/g9  
  } t+#vcg,G  
 } 1nR\ m+{  
} )C$pjjo/`  
T*%O\&'r  
BOOL CHookApp::InitInstance() v+~O\v5Q  
{ "I QM4:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); `h~-  
 hins=AfxGetInstanceHandle(); *{(tg~2'(  
 InitHotkey(); 1Q7]1fRu  
 return CWinApp::InitInstance(); 0*,] `A=  
} d^Rea8  
m[nrr6 G"  
int CHookApp::ExitInstance() XZ:6A]62I  
{ [ZL<Q  
 VerifyWindow(); Y+DVwz$  
 UnInit(); Prrz>  
 return CWinApp::ExitInstance(); _ZE&W  
} ;!B,P-Z"g  
bb}Fu/S  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file L=gG23U&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 0py29>"t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ))6YOc  
#if _MSC_VER > 1000 0lU pil  
#pragma once N_E)f  
#endif // _MSC_VER > 1000 T%yGSk  
< =!FB8 .  
class CCaptureDlg : public CDialog "%w E>E  
{ U^kk0OT^  
 // Construction w&*oWI$i  
 public: P1&Irwb`  
  BOOL bTray; O f]/tdPp  
  BOOL bRegistered; sZ0)f!aH:_  
  BOOL RegisterHotkey(); 47)\\n_\z  
  UCHAR cKey; gkDXt^Ob  
  UCHAR cMask; X2`n&JE  
  void DeleteIcon(); oK3PA  
  void AddIcon(); WO*dO9O  
  UINT nCount; Ap> H-/C  
  void SaveBmp(); 8{)N%r  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;P^}2i[q>[  
  // Dialog Data -YS9u [   
  //{{AFX_DATA(CCaptureDlg) :464~tHI[`  
  enum { IDD = IDD_CAPTURE_DIALOG }; W^i[7 r  
  CComboBox m_Key; Nk<H=kw+  
  BOOL m_bControl; -PaR&0Tt  
  BOOL m_bAlt; ;pqS|ayl  
  BOOL m_bShift; TiKfIv  
  CString m_Path; F.AP)`6+*  
  CString m_Number; S& F;~  
  //}}AFX_DATA x_- SAyH  
  // ClassWizard generated virtual function overrides ywj'O e41  
  //{{AFX_VIRTUAL(CCaptureDlg) ~<"{u-q#K  
 public: 7*r!-$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0GQKM~|H  
 protected: _sQhDi  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support or(P?Ro  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); qmtH0I7)  
  //}}AFX_VIRTUAL Y?%=6S  
  // Implementation 2]Ei4%jo  
 protected: $U'*}S  
  HICON m_hIcon; <m*j1|^{t  
  // Generated message map functions `We?j7O  
  //{{AFX_MSG(CCaptureDlg) 6 )lWuY]e  
  virtual BOOL OnInitDialog(); 'OU`$K7n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); S_;m+Ytg  
  afx_msg void OnPaint(); 6%MM)Vj+u  
  afx_msg HCURSOR OnQueryDragIcon(); \q"vC1,9  
  virtual void OnCancel(); n`D-?]*  
  afx_msg void OnAbout(); m,Mg  
  afx_msg void OnBrowse(); _pkmHj(  
  afx_msg void OnChange(); A27!I+M  
 //}}AFX_MSG ^xq)Q?[{  
 DECLARE_MESSAGE_MAP() ]'<"qY  
}; ,uZz?7mO  
#endif d~y]7h|  
26MoYO!k  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file #<vzQ\~Y  
#include "stdafx.h" db.~^][k  
#include "Capture.h" I.p"8I;  
#include "CaptureDlg.h" wq]vcY9^  
#include <windowsx.h> B3p79 j  
#pragma comment(lib,"hook.lib") I=;=;-  
#ifdef _DEBUG ufN`=IJ%  
#define new DEBUG_NEW x5k6"S"1,  
#undef THIS_FILE `82^!7!  
static char THIS_FILE[] = __FILE__; "YN6o_*]  
#endif  dK]#..  
#define IDM_SHELL WM_USER+1 o[g]Va*8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ue -a/a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G*g*+D[HM  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WyUa3$[gO  
class CAboutDlg : public CDialog &<# ,J4  
{ Hi&bNM>?O  
 public: 54Vb[;`Kkb  
  CAboutDlg(); n66b(6"mO2  
  // Dialog Data 0+k=gO  
  //{{AFX_DATA(CAboutDlg) vkLyGb7r<  
  enum { IDD = IDD_ABOUTBOX }; +< )H2  
  //}}AFX_DATA gyob q'o-  
  // ClassWizard generated virtual function overrides  >1q:-^  
  //{{AFX_VIRTUAL(CAboutDlg) ckbD/+  
 protected: w +HKvOs5c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *s?C\)x  
  //}}AFX_VIRTUAL yS4nB04`=  
  // Implementation `m\ ?gsw7  
 protected: R.rE+gxO1  
  //{{AFX_MSG(CAboutDlg)  @4>?Y=#  
  //}}AFX_MSG Q7_#k66gb7  
  DECLARE_MESSAGE_MAP() .8XkB<[wb  
}; P UC:Pl77  
;W3c|5CE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6\x/Z=}L  
{ oP:/%  
 //{{AFX_DATA_INIT(CAboutDlg) Lt {&v ^y  
 //}}AFX_DATA_INIT UZo[]$"Q`  
} wpOM~!9R  
@"afEMd  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \o5/, C  
{ c22L]Sxo  
 CDialog::DoDataExchange(pDX); dl+c+w"  
 //{{AFX_DATA_MAP(CAboutDlg) O`.IE? h#  
 //}}AFX_DATA_MAP l?KP /0`  
} $Q`\-  
VW:Voc  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >| hqt8lY  
 //{{AFX_MSG_MAP(CAboutDlg) Agwl2AM5k  
 // No message handlers Pk^V6-  
 //}}AFX_MSG_MAP C+0BV~7J<<  
END_MESSAGE_MAP() c  
>t4<2|!(M  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D"P<;@ef  
: CDialog(CCaptureDlg::IDD, pParent) o 'Z W  
{ :-j/Y'H_  
 //{{AFX_DATA_INIT(CCaptureDlg) /Tp>aW%}"  
  m_bControl = FALSE; QLZ%m$Z  
  m_bAlt = FALSE; N._^\FRyn  
  m_bShift = FALSE; J:\O .F#Fi  
  m_Path = _T("c:\\"); }KV)F,`  
  m_Number = _T("0 picture captured."); `LJ.NY pP  
  nCount=0;  !~]'&9  
  bRegistered=FALSE; _J0(GuG=~  
  bTray=FALSE; ]"i^ VVw  
 //}}AFX_DATA_INIT #3YYE5cB  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 S>R40T=e  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Zc=#Y  
} Z`ZML+;~6  
XpdjWLO]C<  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $~T|v7Y%  
{ 2l+t-  
 CDialog::DoDataExchange(pDX); sfC/Q"Zs  
 //{{AFX_DATA_MAP(CCaptureDlg) G4"[ynlWV  
  DDX_Control(pDX, IDC_KEY, m_Key); 4iJ4g%]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -9(nsaV  
  DDX_Check(pDX, IDC_ALT, m_bAlt); `12Y2W 9  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); D`PA@t  
  DDX_Text(pDX, IDC_PATH, m_Path); LP} j0)n  
  DDX_Text(pDX, IDC_NUMBER, m_Number); VB~Do?]*k%  
 //}}AFX_DATA_MAP 3MoVIf1  
} yXro6u?rC  
r?WOum  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8VMD304  
//{{AFX_MSG_MAP(CCaptureDlg) "O%xQ N  
 ON_WM_SYSCOMMAND() p:Zhg{sF  
 ON_WM_PAINT() y9 K'(/  
 ON_WM_QUERYDRAGICON() vH{JLN2  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) jo"zd b  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) nc:K!7:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #|6M*;lN|  
//}}AFX_MSG_MAP J_&G\b.9/  
END_MESSAGE_MAP() {Yv5Z.L&(  
cN| gaL  
BOOL CCaptureDlg::OnInitDialog() =2d h}8Mz  
{ }1YQ?:@  
 CDialog::OnInitDialog(); 'l._00yu  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _@sSVh$+  
 ASSERT(IDM_ABOUTBOX < 0xF000); y&2O)z!B  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @*JS[w$1  
 if (pSysMenu != NULL) U z MIm  
 { t,qz%J&a  
  CString strAboutMenu; CPu~^ik  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `YK#m4gc  
  if (!strAboutMenu.IsEmpty()) *"j3x} U<  
  { Oyy E0  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?I 7hbqQd  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); fUB+9G(Bx  
  } Kk/cI6`W  
 } \`YV)"y" ~  
 SetIcon(m_hIcon, TRUE); // Set big icon fCi1JH;  
 SetIcon(m_hIcon, FALSE); // Set small icon 0vcFX)]yW  
 m_Key.SetCurSel(0); kj!mgu#T  
 RegisterHotkey(); nPjN\Es6  
 CMenu* pMenu=GetSystemMenu(FALSE); <nF1f(ky  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &=l aZxe  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 9TV1[+JWe  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); uG4Q\,R  
 return TRUE; // return TRUE unless you set the focus to a control '];=1loD  
} Q}]RB$ZS  
0[fqF^HEN  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ^vo]bq7  
{ Med0O~T%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) a`zw5  
 { 4"Pf0PD:  
  CAboutDlg dlgAbout; # |,c3$  
  dlgAbout.DoModal(); >2K:O\&  
 } >~\CiV4^  
 else 7R>Pk9J  
 { @%[ VegT  
  CDialog::OnSysCommand(nID, lParam); IHj9n>c)[  
 } r~T3Ieb  
} CI@qT}Y_  
W.  p'T}2  
void CCaptureDlg::OnPaint() L_}F.nbS5  
{ 7)y +QU]  
 if (IsIconic()) .0]Odf:@  
 { 1)ZdkTF@H  
  CPaintDC dc(this); // device context for painting jLreN#:9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); PA>su)N$  
  // Center icon in client rectangle 1'9YY")#  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4z!(!J )  
  int cyIcon = GetSystemMetrics(SM_CYICON); q@Sj$  
  CRect rect; yx/.4DW1Ua  
  GetClientRect(&rect); 2R`}}4<Z  
  int x = (rect.Width() - cxIcon + 1) / 2; s%t =*+L\  
  int y = (rect.Height() - cyIcon + 1) / 2; *gN)a%9  
  // Draw the icon S{c;n*xf  
  dc.DrawIcon(x, y, m_hIcon); ^I6GH?19>e  
 } IsP!ZcV;  
 else ph=U<D4  
 { bd3q207>  
  CDialog::OnPaint(); S&;D  
 } |=ljN7]!  
} nWv6I&  
/SQ1i}%  
HCURSOR CCaptureDlg::OnQueryDragIcon() uzWz+atH  
{ G>0 hi1  
 return (HCURSOR) m_hIcon; [USE&_RN  
} o'p[G]NQ1o  
&!O~ f  
void CCaptureDlg::OnCancel() !7aJfs2  
{ \UBQ:+3  
 if(bTray) '@eH)wh@m)  
  DeleteIcon(); Y(P <9 m:  
  CDialog::OnCancel(); F(;C \[Ep  
} C\; $RH  
?\![W5uuXG  
void CCaptureDlg::OnAbout() GYN Lyd)  
{ &Ch~$Wb^  
 CAboutDlg dlg; doV+u(J~  
 dlg.DoModal(); Z1M{5E  
} $#d.@JWi  
L=5Fvm  
void CCaptureDlg::OnBrowse() +@5*_n\e`  
{ y7Sj^muBY  
 CString str; m6M:l"u  
 BROWSEINFO bi; Zywx.@!  
 char name[MAX_PATH]; ]eIV'lP,j/  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~3s\Q%   
 bi.hwndOwner=GetSafeHwnd(); =hB0p^a  
 bi.pszDisplayName=name; ^ ]CQd   
 bi.lpszTitle="Select folder"; U Zc%XZ`"V  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [49Ae2W`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ${)s ~[  
 if(idl==NULL) hDHIi\%  
  return; vP{;'R  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); P0XVR_TJf  
 str.ReleaseBuffer(); b#E!wMClS  
 m_Path=str; +K03yphZr  
 if(str.GetAt(str.GetLength()-1)!='\\') `d. 4 L.],  
  m_Path+="\\"; uQtwh08i  
 UpdateData(FALSE); mY,t]#^m7  
} #~`]eM5`J  
keL!;q|r-)  
void CCaptureDlg::SaveBmp() ,7|Wf %X  
{ I 6Mr[#*  
 CDC dc; UIi`bbJ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >PMLjXK  
 CBitmap bm; * IBCThj  
 int Width=GetSystemMetrics(SM_CXSCREEN); k>q}: J9V  
 int Height=GetSystemMetrics(SM_CYSCREEN);  F5FzT^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); YUsMq3^&  
 CDC tdc; m kHcGB!~  
 tdc.CreateCompatibleDC(&dc); 3Mt Alc0xp  
 CBitmap*pOld=tdc.SelectObject(&bm); x$Tf IFy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  = ~^  
 tdc.SelectObject(pOld); MJ0UZxnl  
 BITMAP btm; (YH/#n1"{  
 bm.GetBitmap(&btm); ;m cu(J  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; hz~jyH.h_  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); a #4 'X*  
 BITMAPINFOHEADER bih; Seb J}P1x  
 bih.biBitCount=btm.bmBitsPixel; *oU-V#   
 bih.biClrImportant=0; Y]>Qu f.!  
 bih.biClrUsed=0; UAq%Y8KA  
 bih.biCompression=0; J{bNx8.&  
 bih.biHeight=btm.bmHeight; -C<Ni  
 bih.biPlanes=1; bem-T`>'  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7JHS8C<]  
 bih.biSizeImage=size; Kk_h&by?  
 bih.biWidth=btm.bmWidth; }MV=I$S2U  
 bih.biXPelsPerMeter=0; Ar VNynQ  
 bih.biYPelsPerMeter=0; A/#Xr  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); sCE2 F_xjL  
 static int filecount=0; ;5wr5H3  
 CString name; h1 (MvEt  
 name.Format("pict%04d.bmp",filecount++); y:3d`E4Xw  
 name=m_Path+name; [Y=X^"PF  
 BITMAPFILEHEADER bfh; ,,KGcDBj  
 bfh.bfReserved1=bfh.bfReserved2=0; <UMT:`h1MZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 37QXML  
 bfh.bfSize=54+size; @"E{gM@B  
 bfh.bfOffBits=54; O9tgS@*Tv  
 CFile bf; Zc9j_.?*  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ dn)pVti_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }^R_8{>k  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Jf{ M[ z  
  bf.WriteHuge(lpData,size); @*rED6zH  
  bf.Close(); --9Z  
  nCount++; Nu%:7  
 } hfuGCD6F`  
 GlobalFreePtr(lpData); 'N?t=A  
 if(nCount==1) 3@7<e~f  
  m_Number.Format("%d picture captured.",nCount); g2'Q)w  
 else t[-0/-4  
  m_Number.Format("%d pictures captured.",nCount); HAr_z@#E  
  UpdateData(FALSE); }.R].4gT  
} <7%4=  
p~xrl jP$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :xP$iEA`G  
{ w(xRL#%  
 if(pMsg -> message == WM_KEYDOWN) N2x!RYW  
 { Vt!<.8&`  
  if(pMsg -> wParam == VK_ESCAPE) _noQk3N  
   return TRUE; \"u3 x.!  
  if(pMsg -> wParam == VK_RETURN) f!"Y"g:@E  
   return TRUE; 'F[ C 4  
 } }&mFpc  
 return CDialog::PreTranslateMessage(pMsg); 6b8@6;&LI  
} 0piBK=tE/  
X) TUKt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _7M!b 9oA  
{ ToB^/ n[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 5@{+V!o,  
  SaveBmp(); Mn=5yU  
  return FALSE; 8{GRrwQ>  
} 23;e/Qr  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ BOQeP/>  
 CMenu pop; !dW77kLTg  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Hw"UJP  
 CMenu*pMenu=pop.GetSubMenu(0); H~P"uYKIZ  
 pMenu->SetDefaultItem(ID_EXITICON); 7q] @Jx9  
 CPoint pt; k9^Vw+$m  
 GetCursorPos(&pt); ;I+"MY7D  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); b:iZ.I  
 if(id==ID_EXITICON) MK<VjpP0(  
  DeleteIcon(); 9A4h?/  
 else if(id==ID_EXIT) s;0eD5b>x  
  OnCancel(); g#ZuRL  
 return FALSE; !^|%Z  
} r_kw "9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ab=s+[r1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) hR$lX8  
 AddIcon(); IHg)xZ  
 return res; ^3-Wxn9&  
} ;^,2 QsM  
Y)@PGxjz  
void CCaptureDlg::AddIcon() O&:0mpRZ  
{ VhAZncw  
 NOTIFYICONDATA data; P~+?:buqc  
 data.cbSize=sizeof(NOTIFYICONDATA); {xC CUU  
 CString tip; 'ZHu=UT7_  
 tip.LoadString(IDS_ICONTIP); WR*|kh  
 data.hIcon=GetIcon(0); Hh bf9)  
 data.hWnd=GetSafeHwnd(); ikGH:{  
 strcpy(data.szTip,tip); $DfaW3bJ  
 data.uCallbackMessage=IDM_SHELL; J\%<.S>  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; V+dfV`*k  
 data.uID=98; Ur626}  
 Shell_NotifyIcon(NIM_ADD,&data); hao0_9q+  
 ShowWindow(SW_HIDE); x Qh?  
 bTray=TRUE; a9E!2o+,  
} S%ri/}qI[{  
h]94\XQ>$  
void CCaptureDlg::DeleteIcon() rI:KZ}GZ  
{ RT45@   
 NOTIFYICONDATA data; O8+[ )+6^  
 data.cbSize=sizeof(NOTIFYICONDATA); 4JHQ^i-aY  
 data.hWnd=GetSafeHwnd(); -%=StWdb   
 data.uID=98; i;0`d0^  
 Shell_NotifyIcon(NIM_DELETE,&data); ,<lxq<1I  
 ShowWindow(SW_SHOW); 4Pljyq:  
 SetForegroundWindow(); <(JsB'TK  
 ShowWindow(SW_SHOWNORMAL); n/"T7Y\2  
 bTray=FALSE; 6Upg\(  
} wE75HE`gW  
/s%I(iP4  
void CCaptureDlg::OnChange() \ooqa<_  
{ Gc9^Z=  
 RegisterHotkey(); UZdE ^Q[  
} 8-5a*vV,>  
\QUvImT  
BOOL CCaptureDlg::RegisterHotkey() ED/-,>[f  
{ tji,by#E/%  
 UpdateData(); !dLz ?0  
 UCHAR mask=0; mm=Y(G[_%y  
 UCHAR key=0; ucj)t7O   
 if(m_bControl) Yf:utCvv  
  mask|=4; Kfj*uzKB  
 if(m_bAlt) <LW|m7  
  mask|=2; $ Yz &x%Lb  
 if(m_bShift) HHZ!mYr  
  mask|=1; kXC.rgal  
  key=Key_Table[m_Key.GetCurSel()]; bE>3D#V<  
 if(bRegistered){ ABV\:u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,l<-*yMD  
  bRegistered=FALSE; F!>K8q  
 } 1A- 8,)  
 cMask=mask; Hcd>\0  
 cKey=key; +&\TdvNI4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); l@*/1O)v  
 return bRegistered; J'O`3!Oy/  
} [6S"iNiyKT  
=] 5;=>(  
  四、小结 <nsl`C~6g0  
l1cBY{3QD  
  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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