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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: "`cN k26JZ  
  \,Ws=9f  
  一、实现方法 Bk3\NPa  
n= 4  
  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: FS=yc.Q_  
xi{ r-D8Z  
#pragma data_seg("shareddata") `B"sy8}x  
HHOOK hHook =NULL; //钩子句柄 2DPv7\fW  
UINT nHookCount =0; //挂接的程序数目 RHBQgD$  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 &-qQF`7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $%cHplQz5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey i,^3aZwJ'  
static int KeyCount =0; 6\I^]\YO  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9s_^?q  
#pragma data_seg() tqpO3  
LA_{[VWYp>  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 \~A qA!)6  
^CLQs;zXE  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: >w<w*pC  
U!-Nx9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR E\DA3lq  
cKey,UCHAR cMask) :0B 7lDw  
{ )aGSZ1`/  
 BOOL bAdded=FALSE; _b%)  
 for(int index=0;index<MAX_KEY;index++){ ;6``t+]q   
  if(hCallWnd[index]==0){ Z6${nUX  
   hCallWnd[index]=hWnd; kd!?N  
   HotKey[index]=cKey; #0T/^ #  
   HotKeyMask[index]=cMask; FHU6o910  
   bAdded=TRUE; L~t< 0\r  
   KeyCount++; 6Jq[]l"v  
   break; ,k~' S~w.  
  } 1UJrPM%  
 } 5\z<xpJ  
 return bAdded; ^D+^~>f  
} B%uY/Mwz$  
//删除热键 k*)sz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YhV<.2^k  
{ "g5{NjimY  
 BOOL bRemoved=FALSE; F<b'{qf"  
 for(int index=0;index<MAX_KEY;index++){ C^L xuUW  
  if(hCallWnd[index]==hWnd){ g|]HS4y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \Aro Sy9  
    hCallWnd[index]=NULL; <skqq+  
    HotKey[index]=0; ;x\oY6:  
    HotKeyMask[index]=0; :Q"|%#P  
    bRemoved=TRUE; R6(:l; W  
    KeyCount--; hm73Zy  
    break; RV  V`  
   } pAatv;Ex  
  }  "&k(lQ4  
 } #PD6LO  
 return bRemoved; lh'S_p8g  
} y8s!sO  
_xv3UzD  
exhU!p8  
  DLL中的钩子函数如下: @T\n@M]  
:K^J bQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) V2}\]x'1  
{ PhC3F4  
 BOOL bProcessed=FALSE; :CE4< {V  
 if(HC_ACTION==nCode) KL=<s#  
 { \wA:58 -j  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0pMN@Cz6  
   switch(wParam) '+_>PBOc  
   {  7C7.}U  
    case VK_MENU: ~i;{+j6Ho!  
     MaskBits&=~ALTBIT; t([}a ~1}  
     break; <r: AJ;  
    case VK_CONTROL: B%;MGb o  
     MaskBits&=~CTRLBIT; c$V5E t  
     break; [y@*vQw  
    case VK_SHIFT: =|P &G~]  
     MaskBits&=~SHIFTBIT; [o#% Eg;  
     break; i$E [@  
    default: //judge the key and send message @/<UhnI  
     break; * HKu%g  
   }  %nY\"  
   for(int index=0;index<MAX_KEY;index++){ W#<1504ip  
    if(hCallWnd[index]==NULL) 7m-%  
     continue; _aPAn|.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =lJ ?yuc  
    { hNN[djR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j-ej7  
     bProcessed=TRUE; DD$> 3`  
    } GVXdyi  
   } G@H!D[wd  
  } "9s_[e  
  else if((lParam&0xc000ffff)==1){ //有键按下 A0)^I:&  
   switch(wParam) f zo'9  
   { h) Wp  
    case VK_MENU: (*$bTI/~  
     MaskBits|=ALTBIT; jCJcVO>OZ  
     break; DRQx5fgL  
    case VK_CONTROL: Gc|)4c  
     MaskBits|=CTRLBIT; ~'_cBJ 'XD  
     break; w95M B*N  
    case VK_SHIFT: o]oiJvOr  
     MaskBits|=SHIFTBIT; &+2l#3}  
     break; 06pvI}   
    default: //judge the key and send message _Ub `\ytx  
     break; !e|\1v'0  
   } G7CeWfS  
   for(int index=0;index<MAX_KEY;index++){ ls@]%pz.1d  
    if(hCallWnd[index]==NULL) R p&J!hlA  
     continue; Q|AZv>'!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 27eG8  
    { >u$8Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SQ>i:D;  
     bProcessed=TRUE; SL4?E<Jb  
    } qG6s.TcG  
   } d<a|dwAeh  
  } O{LCHtN  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 '}_r/l]K  
   for(int index=0;index<MAX_KEY;index++){ C27:ty V  
    if(hCallWnd[index]==NULL) {]^Ixm-,f  
     continue; ?mg@zq8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1]7gYNzV"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]P?< 2,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 |ri)-Bk ,  
   } lxhb)]c ^>  
  } [%.v;+L  
 } 3gi)QCsk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); MoIh =rw  
} :skR6J  
'Z`7/I4&  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: y"JR kJ  
<>3)S`C`p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =5+*TL`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); sasurR|;  
6z9 '|;,4  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: (wDE!H7  
`$T$483/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F_ F"3'[  
{ cszvt2BIg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) WUYI1Ij;  
 { J$3g3%t  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @ma(py  
  SaveBmp(); 5WQl?yMP  
  return FALSE; kTvM,<  
 } D4=*yP  
 …… //其它处理及默认处理 79h~w{IT@  
} fW-C`x  
ShB]U5b:k  
.;?!I_`  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ! xCo{U=  
UD.b b  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 r`O Yq  
75^6?#GS  
  二、编程步骤 ?%s>a8w  
x}] 56f  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; LIZB!S@V\  
3 t,_{9  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ix3LB!k<  
Zl9@E;|=  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; )% 7P?^>  
/'/I^ab  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; qyH -Z@  
isZ5s\  
  5、 添加代码,编译运行程序。 "D(Lp*3hj&  
}|P3(*S  
三、程序代码 .hl_zc#  
bNea5u##  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL W: ]FYC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ww7Ya]b.k  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ I~GF%$-G  
#if _MSC_VER > 1000 GShxPH{_j  
#pragma once -JMn?]  
#endif // _MSC_VER > 1000 H71sxek3  
#ifndef __AFXWIN_H__ Wc3z7xK1@  
#error include 'stdafx.h' before including this file for PCH HK@ij,px  
#endif 7zM:z,  
#include "resource.h" // main symbols "j^i6RS  
class CHookApp : public CWinApp \|;\  
{ CXlbtpK2k  
 public: qkb'@f=  
  CHookApp(); NX @FUct;  
  // Overrides PMzPj,  
  // ClassWizard generated virtual function overrides nr!N%Hi  
  //{{AFX_VIRTUAL(CHookApp) g52a vG  
 public: ^#/FkEt7bp  
  virtual BOOL InitInstance(); %MHb  
  virtual int ExitInstance(); U&5* >fd=  
  //}}AFX_VIRTUAL Kgbm/L0XR*  
  //{{AFX_MSG(CHookApp) XjX  
  // NOTE - the ClassWizard will add and remove member functions here. /)P}[Q4  
  // DO NOT EDIT what you see in these blocks of generated code ! AYts &+  
  //}}AFX_MSG isQ(O  
  DECLARE_MESSAGE_MAP() 'YL[s  
}; FwCb$yE#M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *3GV9'-P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); (f#(B2j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); =*mT{q@  
BOOL InitHotkey(); Jup)m/  
BOOL UnInit(); =6%oW2E\  
#endif 22\!Z2@T/  
R@vcS=m7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. kBu{ bxL  
#include "stdafx.h" oaoTd$/5  
#include "hook.h" /R)wM#&  
#include <windowsx.h> Tg\bpLk0=  
#ifdef _DEBUG YDt+1Kw}D  
#define new DEBUG_NEW @AsJnf$y  
#undef THIS_FILE jwZ,_CK  
static char THIS_FILE[] = __FILE__; 0I&k_7_   
#endif ^t;z;.g  
#define MAX_KEY 100 V2MOD{Maat  
#define CTRLBIT 0x04 W'lqNOX[v  
#define ALTBIT 0x02 0 'QWa{dS\  
#define SHIFTBIT 0x01 P15 H[<:Fz  
#pragma data_seg("shareddata") CD|[PkjW  
HHOOK hHook =NULL; }r:o8+4  
UINT nHookCount =0; T<AT&4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4fEDg{T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }cKB)N BJb  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey pfA6?tP`  
static int KeyCount =0; zkQ[<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +X}i%F'  
#pragma data_seg() "t@p9>  
HINSTANCE hins; #/)t]&n  
void VerifyWindow(); C8N)!5(A  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r"h;JC/&<T  
//{{AFX_MSG_MAP(CHookApp) i|YS>Pw~j  
// NOTE - the ClassWizard will add and remove mapping macros here. mgs(n5V5  
// DO NOT EDIT what you see in these blocks of generated code! a?c&#Jl  
//}}AFX_MSG_MAP !vnQ;g5  
END_MESSAGE_MAP() UO/sv2CN  
:+rGBkw1m  
CHookApp::CHookApp() N ##`  
{ _7 3q,3`24  
 // TODO: add construction code here, ,"(L2+Yp  
 // Place all significant initialization in InitInstance ]Bw0Qq F#  
} >DqF>w.1  
:6^7l/p  
CHookApp theApp; ?$r`T]>`2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) J=4>zQLW  
{ PNU(;&2<  
 BOOL bProcessed=FALSE; E-e(K8R  
 if(HC_ACTION==nCode) $6hPTc<C  
 { =YO ]m<  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5j%G7.S\  
   switch(wParam) 6 SSDc/  
   { f8 d 3ZK  
    case VK_MENU: AOf4y&B>q  
     MaskBits&=~ALTBIT; jG5HW*>k0  
     break; nB[-KS  
    case VK_CONTROL: ~(5r+Z}*`  
     MaskBits&=~CTRLBIT; *{o7G  a  
     break; 0D X_ *f  
    case VK_SHIFT: .6B\fr.za  
     MaskBits&=~SHIFTBIT; U)S=JT~h  
     break; :!ya&o  
    default: //judge the key and send message gL;Kie6Z  
     break; 6% D9;-N)  
   } " qI99e  
   for(int index=0;index<MAX_KEY;index++){ p{FI_6db  
    if(hCallWnd[index]==NULL) :|7#D,2  
     continue; '`];=QY9pg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H=r-f@EOrI  
    { 3r\8v`^>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); d|`Ll  
     bProcessed=TRUE; v* ;d  
    } lW bu`y  
   } xNP_>Qa~  
  } 0}{xH  
  else if((lParam&0xc000ffff)==1){ //Key down Fe+ @;  
   switch(wParam) md!6@)S-p  
   { ~MpikBf  
    case VK_MENU: ;"3B,Yj  
     MaskBits|=ALTBIT; k3\N.@\  
     break; D}-.<  
    case VK_CONTROL: XQ}Zr/f6  
     MaskBits|=CTRLBIT; Fsx?(?tCMo  
     break; |(7}0]BP0  
    case VK_SHIFT: xQy,1f3s+  
     MaskBits|=SHIFTBIT; tAX* CMW  
     break; rS8a/d~;0  
    default: //judge the key and send message B.z$0=b  
     break; 8v:{BHX  
   } ?RRO  
   for(int index=0;index<MAX_KEY;index++) 0p.bmQSH  
   { g(7 -3q8eq  
    if(hCallWnd[index]==NULL) 0mw1CUx9K  
     continue; V"FQVtTx7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lame/B&nc  
    { t [QD#;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $ {Z0@G+  
     bProcessed=TRUE; Xtp8 ^4Va  
    } 1uF$$E6[  
   } 8h )XULs2  
  } 2*Z2uV^  
  if(!bProcessed){ AeJ ;g  
   for(int index=0;index<MAX_KEY;index++){ voWH.[n^_  
    if(hCallWnd[index]==NULL) 49$P  
     continue; <LX\s*M)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J[ds.~ $  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); gN&i &%*!  
   } pO]gf$  
  } zF&VzNR2  
 } yMs!6c*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rk=D5E7  
} ^xo<$zn  
.nV2 n@SR  
BOOL InitHotkey() >J"IN I  
{ V35Vi6*p  
 if(hHook!=NULL){ |dRVSVN  
  nHookCount++; 3"fDFR  
  return TRUE;  Et>#&Nw8  
 } qT O6I5u  
 else OLw]BJXYaE  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); xm'9n?  
  if(hHook!=NULL) @sXFu[!U  
   nHookCount++; _vQ52H,  
  return (hHook!=NULL); XTol|a=  
} UK`A:N2[  
BOOL UnInit() L"_X W no  
{ ~^t@TMk$  
 if(nHookCount>1){ H DVimoOq  
  nHookCount--; bMH~vR  
  return TRUE; %idBR7?`g  
 } ?vXgHDs^T  
 BOOL unhooked = UnhookWindowsHookEx(hHook); gLiJ&H  
 if(unhooked==TRUE){ 6W1GvM\e  
  nHookCount=0; p6M9uu  
  hHook=NULL; WhPP4 #  
 } tRjv  -  
 return unhooked; `y8pwWo-o  
} _\!]MV  
Z~'t'.=z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t;O)   
{  tm1 =  
 BOOL bAdded=FALSE; 0.GFg${v`  
 for(int index=0;index<MAX_KEY;index++){ z2=bbm:  
  if(hCallWnd[index]==0){ V>6klA}o  
   hCallWnd[index]=hWnd; F^ q{[Z  
   HotKey[index]=cKey; 4vhf!!1  
   HotKeyMask[index]=cMask;  MlO OB  
   bAdded=TRUE; -Cf)`/  
   KeyCount++; X1o",,N^M  
   break; 7*:zN  
  } ]8$8QQc<<5  
 } ;\MWxh,K  
 return bAdded; XqH@3Ehk  
} ^W |YE72Y  
kUT2/3Vi  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X2w)J?pv  
{ X+vKY  
 BOOL bRemoved=FALSE; I8H3*DE  
 for(int index=0;index<MAX_KEY;index++){ xJq|,":gj  
  if(hCallWnd[index]==hWnd){ 9#8vPjXW}.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l{By]S  
    hCallWnd[index]=NULL; ?d')#WnC  
    HotKey[index]=0; +NlnK6T/  
    HotKeyMask[index]=0; F>;Wbk&[|  
    bRemoved=TRUE; U)}]Z@I-  
    KeyCount--; d)%WaM%V  
    break; 72HA.!ry  
   } D%SOX N  
  } XM'tIE+|  
 } w[~G^x&  
 return bRemoved; \C~X_/sg  
} CS^6$VL7e  
OVK )]- ~  
void VerifyWindow() 84ij4ZYe  
{ tBo\R?YRs  
 for(int i=0;i<MAX_KEY;i++){ An2 >]\L  
  if(hCallWnd!=NULL){ Kda'N$|`  
   if(!IsWindow(hCallWnd)){ z?/_b  
    hCallWnd=NULL; K3&xe(  
    HotKey=0; x}G:n[B7_V  
    HotKeyMask=0; Hv6h7-  
    KeyCount--; ) f?I{  
   } !gh8 Qs  
  } r$jWjb  
 } R%r bysP  
} J[/WBVFDf  
;zCUx*{  
BOOL CHookApp::InitInstance() YQ0#j'}/  
{ q4ROuE|d  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @ @[xTyA  
 hins=AfxGetInstanceHandle(); 5xH=w:  
 InitHotkey(); "*vrrY  
 return CWinApp::InitInstance(); 6w.E Sm  
} vCa8`m  
3%v)!dTa<^  
int CHookApp::ExitInstance() Vl.,e1)6  
{ :Cq73:1\B  
 VerifyWindow(); NuZ2,<~9  
 UnInit(); ]b- 2:M  
 return CWinApp::ExitInstance(); )O'LE&kQ|  
} {f06Ki  
Gxr\a2Z&r%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file -wU]L5uP  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (/y8KG 3  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .Fb#j+Lq  
#if _MSC_VER > 1000 J8i;E 4R  
#pragma once i)#-VOhX)  
#endif // _MSC_VER > 1000 @9/I^Zk  
PV68d; $:8  
class CCaptureDlg : public CDialog .}faWzRH9  
{ P&`%VW3E  
 // Construction N'{[BA(eE  
 public: Ejug2q  
  BOOL bTray; x*OdMr\n8?  
  BOOL bRegistered; Eq-+g1a  
  BOOL RegisterHotkey(); <':h/ d  
  UCHAR cKey; }`R,C~-|^  
  UCHAR cMask; }:8}i;#M  
  void DeleteIcon(); U>tR:)  
  void AddIcon(); 2A_1E \  
  UINT nCount; ly[yn{  
  void SaveBmp(); r]9-~1T  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }M4dze  
  // Dialog Data s|C[{n<_  
  //{{AFX_DATA(CCaptureDlg) RELNWr  
  enum { IDD = IDD_CAPTURE_DIALOG }; <4rnOQ:  
  CComboBox m_Key; p)biOG  
  BOOL m_bControl; {-A|f  
  BOOL m_bAlt; h'y"`k -  
  BOOL m_bShift; FJ_JaIby  
  CString m_Path; h<9vm[.  
  CString m_Number; cSL6V2F  
  //}}AFX_DATA *\ii +f-  
  // ClassWizard generated virtual function overrides I`_2Q:r  
  //{{AFX_VIRTUAL(CCaptureDlg) (%_X{R'  
 public: %q5dV<X'c  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [,;Y5#Y[5  
 protected: !*]i3 ,{7v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \$9C1@B@  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); rK gl:s j+  
  //}}AFX_VIRTUAL [O3:?BNY  
  // Implementation 9NTNulD>P  
 protected: 8LV6E5Q  
  HICON m_hIcon; /2Izj/Q  
  // Generated message map functions ?LMQz=  
  //{{AFX_MSG(CCaptureDlg) y._'o7%  
  virtual BOOL OnInitDialog(); d(IJ-qJ N  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i l^;2`]&  
  afx_msg void OnPaint(); ("U<@~  
  afx_msg HCURSOR OnQueryDragIcon(); JrcbJt  
  virtual void OnCancel(); b1Vr>:sK47  
  afx_msg void OnAbout(); s|%R  
  afx_msg void OnBrowse(); x3n9|Uud  
  afx_msg void OnChange(); "B'c;0 @q  
 //}}AFX_MSG >0HH#JW  
 DECLARE_MESSAGE_MAP() WK|5:V8E  
}; .\_):j*  
#endif IiE6i43  
T)P)B6q   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HV%/baX]  
#include "stdafx.h" xPZ>vCg  
#include "Capture.h" {aAd (~YZ  
#include "CaptureDlg.h" cWW?@ _  
#include <windowsx.h> 8 a]'G)(ts  
#pragma comment(lib,"hook.lib") sVx}(J  
#ifdef _DEBUG #mV2VIX#Jv  
#define new DEBUG_NEW fkI 5~Y|  
#undef THIS_FILE \'~ E%=Q  
static char THIS_FILE[] = __FILE__; Jc":zR@5  
#endif O9daeIF0#  
#define IDM_SHELL WM_USER+1 GDSV:]hL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }=X: F1S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `cp\UH@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; NP;W=A F  
class CAboutDlg : public CDialog G&S2U=KdV%  
{ L{1sYR%s\  
 public: }y6)d.  
  CAboutDlg(); @43psq1  
  // Dialog Data pGD@R=8  
  //{{AFX_DATA(CAboutDlg) V'9.l6l   
  enum { IDD = IDD_ABOUTBOX }; 4Y(@ KUb  
  //}}AFX_DATA iC3z5_g*@  
  // ClassWizard generated virtual function overrides +2`BZ}5y  
  //{{AFX_VIRTUAL(CAboutDlg) PC9,;T&7_  
 protected: ~| j  eNT  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q:b0M11QR  
  //}}AFX_VIRTUAL i"&FW&W  
  // Implementation <Y k i8  
 protected: &nIu^,.  
  //{{AFX_MSG(CAboutDlg) F85_Lz4  
  //}}AFX_MSG '=0}2sF>  
  DECLARE_MESSAGE_MAP() ;<Q%d~$xy}  
}; ~N!HxQ  
k6CXuU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;VE y{%nF  
{ m* m),mZ"  
 //{{AFX_DATA_INIT(CAboutDlg) -,bnj^L  
 //}}AFX_DATA_INIT F! !HwI  
} >!Yuef <P  
 +vkmS  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) t@!n?j I  
{ 0O"W0s"T#  
 CDialog::DoDataExchange(pDX); o*Qa*<n  
 //{{AFX_DATA_MAP(CAboutDlg) ?=&; A  
 //}}AFX_DATA_MAP oPi>]#X  
} 1Ms]\<^j  
$z=%e#(!I  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7}&:07U  
 //{{AFX_MSG_MAP(CAboutDlg) _:Qh1 &h  
 // No message handlers krfXvQJwJ  
 //}}AFX_MSG_MAP .D W>c}1  
END_MESSAGE_MAP() o-6d$c}{f  
)R7Sh51P  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 529b. |  
: CDialog(CCaptureDlg::IDD, pParent) =Pv_,%  
{ ~ *&\5rPb  
 //{{AFX_DATA_INIT(CCaptureDlg) y?OP- 27y  
  m_bControl = FALSE; \:;MFG'  
  m_bAlt = FALSE; irQ'Rm [  
  m_bShift = FALSE; L('1NN 2  
  m_Path = _T("c:\\"); CY o m  
  m_Number = _T("0 picture captured."); ILm +o$o ~  
  nCount=0; (H_dZL  
  bRegistered=FALSE; NifQsy)*%  
  bTray=FALSE; <IR#W$[  
 //}}AFX_DATA_INIT (~DW_+?]'  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9w-\K]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *s4|'KS2o  
} "'CvB0>   
[oh06_rB  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Ic(qA{SM  
{ `O6#-<>  
 CDialog::DoDataExchange(pDX); F;Q,cg M  
 //{{AFX_DATA_MAP(CCaptureDlg) R&|.Lvmc/  
  DDX_Control(pDX, IDC_KEY, m_Key); MtJ-pa~n  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :{a< ~n`  
  DDX_Check(pDX, IDC_ALT, m_bAlt); pyhXET '  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); mn@1&#c4y  
  DDX_Text(pDX, IDC_PATH, m_Path); Ze V@ X  
  DDX_Text(pDX, IDC_NUMBER, m_Number); S"!6]!~^  
 //}}AFX_DATA_MAP ZN8j})lE  
} # `=Zc7gf  
r~,y3L6ic  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /V,xSK9.&  
//{{AFX_MSG_MAP(CCaptureDlg) R&cT Md  
 ON_WM_SYSCOMMAND() vgeqH[:  
 ON_WM_PAINT() *aCL/:  
 ON_WM_QUERYDRAGICON() [-\Y?3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ]r;rAOWVV  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) wlNL;W@w  
 ON_BN_CLICKED(ID_CHANGE, OnChange) dWn6-es  
//}}AFX_MSG_MAP ehW[LRtq  
END_MESSAGE_MAP() _UVpQ5pN  
LtRRX@qJw  
BOOL CCaptureDlg::OnInitDialog() m%L!eR  
{ /MtmO$ .  
 CDialog::OnInitDialog(); [~N;d9H+*1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =RWTjTZ   
 ASSERT(IDM_ABOUTBOX < 0xF000); W^iK9|[qp  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &%fcGNzJQ  
 if (pSysMenu != NULL) V ,KIi_Z  
 { Pk;w.)kT  
  CString strAboutMenu; CFFb>d  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `ArUoYb B  
  if (!strAboutMenu.IsEmpty()) %* 0GEfl/  
  { v\@qMaPY  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5[;[Te9=S  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e_b,{l#  
  } Ii+3yE@c  
 } Bj 7* 2}  
 SetIcon(m_hIcon, TRUE); // Set big icon P8m0]T.&x  
 SetIcon(m_hIcon, FALSE); // Set small icon e=9/3?El  
 m_Key.SetCurSel(0); i\CA6I  
 RegisterHotkey(); 7RT{RE  
 CMenu* pMenu=GetSystemMenu(FALSE); w>2lG3H<  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]y {tMC  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :la i0> D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2E40&  
 return TRUE; // return TRUE unless you set the focus to a control p8,=K<  
} d~8U1}dP  
Ubu&$4a  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `sm Cfh}j6  
{ ]\yB,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) THwM',6  
 { CzV;{[?~;  
  CAboutDlg dlgAbout; z#+WK| a  
  dlgAbout.DoModal(); \hX,z =  
 } 7 (2}Vs!5  
 else :=Zd)i)3  
 { <4TI;yy6?  
  CDialog::OnSysCommand(nID, lParam); Y @ v][Q  
 } 0'd@8]|H  
} Vs 5 &X+k  
[6TI_U~  
void CCaptureDlg::OnPaint() $tu   
{ eP~3m  
 if (IsIconic()) IX+Jf? &^  
 { nC3+Zka  
  CPaintDC dc(this); // device context for painting wwl,F=| Y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); u [qy1M0  
  // Center icon in client rectangle U,2OofLM  
  int cxIcon = GetSystemMetrics(SM_CXICON); St?mq* ,  
  int cyIcon = GetSystemMetrics(SM_CYICON); }!^h2)'7  
  CRect rect; W $D 34(  
  GetClientRect(&rect); +(Y\w^@%H  
  int x = (rect.Width() - cxIcon + 1) / 2; mywx V  
  int y = (rect.Height() - cyIcon + 1) / 2; Z kw-a  
  // Draw the icon &m5^ YN$b  
  dc.DrawIcon(x, y, m_hIcon); L@\t] ~  
 } W,~*pyLdO  
 else ++~ G\T9H  
 { 1tXc7NA<  
  CDialog::OnPaint(); dFg&|Lp  
 } {b-C,J  
} 6Y[&1c8  
s>;"bzzq  
HCURSOR CCaptureDlg::OnQueryDragIcon() oRd{?I&NY  
{ >*!T`P}p  
 return (HCURSOR) m_hIcon; @Xoh@:j\  
} ~jw:4sG  
No\#N/1@P  
void CCaptureDlg::OnCancel() (&m1*  
{ 5tv*uz|fv  
 if(bTray) xLIyh7$t  
  DeleteIcon(); _LF'0s*  
  CDialog::OnCancel(); pXNhU88  
} V.3#O^S  
ybJa:  
void CCaptureDlg::OnAbout() }|h-=T '  
{ m:Rx<E E  
 CAboutDlg dlg; t>]W+Lx#  
 dlg.DoModal(); o,k#ft<  
} Ty b_'|?rW  
p3fV w]N  
void CCaptureDlg::OnBrowse() >]}VD "\  
{ RCqL~7C+ k  
 CString str; 3Dc^lfn  
 BROWSEINFO bi;  ~@@t-QY  
 char name[MAX_PATH]; F@/syX;bb5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); TJ>YJ D  
 bi.hwndOwner=GetSafeHwnd(); kk126?V]_  
 bi.pszDisplayName=name; w32F?78]  
 bi.lpszTitle="Select folder"; =SJ[)|  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &/EZn xl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); aJm5`az)  
 if(idl==NULL) RGV{KL  
  return; N+SA$wG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [9?]|4  
 str.ReleaseBuffer(); iP7KM*ks  
 m_Path=str; e7G>'K  
 if(str.GetAt(str.GetLength()-1)!='\\') /_fZ2$/  
  m_Path+="\\"; h<m>S,@g  
 UpdateData(FALSE); LzXIqj'H7T  
} N0fE*xo  
ed,+Slg  
void CCaptureDlg::SaveBmp() ,,XHw;{  
{ w;VUP@Wm  
 CDC dc; f`8fNt  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); z=k*D^X  
 CBitmap bm; ZbH6$2r  
 int Width=GetSystemMetrics(SM_CXSCREEN); D622:Y886  
 int Height=GetSystemMetrics(SM_CYSCREEN); Zo-Au  
 bm.CreateCompatibleBitmap(&dc,Width,Height); zh !/24p9  
 CDC tdc; d{!zJ+n  
 tdc.CreateCompatibleDC(&dc); -GgV&%'a  
 CBitmap*pOld=tdc.SelectObject(&bm); oi3Ix7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); pfim*\'  
 tdc.SelectObject(pOld); dkEnc  
 BITMAP btm; ]H:K$nmX  
 bm.GetBitmap(&btm); i\36 s$\  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; [u3^R]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); UIQ=b;J9  
 BITMAPINFOHEADER bih; *|+ ~V/#  
 bih.biBitCount=btm.bmBitsPixel; kGq<Zmy|  
 bih.biClrImportant=0; Vfw +m1sS  
 bih.biClrUsed=0; I |D]NY^  
 bih.biCompression=0; a(o[ bH.|;  
 bih.biHeight=btm.bmHeight; iEFS>kL8e  
 bih.biPlanes=1; cNN_KA  
 bih.biSize=sizeof(BITMAPINFOHEADER); /-pop]L  
 bih.biSizeImage=size; RmN\;G?}  
 bih.biWidth=btm.bmWidth; "2"*3R<Y  
 bih.biXPelsPerMeter=0; gp'n'K]  
 bih.biYPelsPerMeter=0; gvZLW!={  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); qfY=!|O  
 static int filecount=0; /|e"0;{  
 CString name; ;LT#/t)}<  
 name.Format("pict%04d.bmp",filecount++); Q~*3Z4)j  
 name=m_Path+name; U|h@Pw z  
 BITMAPFILEHEADER bfh; Dc> )js|"  
 bfh.bfReserved1=bfh.bfReserved2=0; r52,f%nlm  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 8&f"")m  
 bfh.bfSize=54+size; `|JQ)!Agx  
 bfh.bfOffBits=54; S4~;bsSx  
 CFile bf; gk6j5 $Y"<  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ^?[^o\/@R  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z42v@?R.!W  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Z@iMG  
  bf.WriteHuge(lpData,size); .yj=*N.  
  bf.Close(); {&(bKQ  
  nCount++; ]O&A:Us  
 } Ip0@Q}^  
 GlobalFreePtr(lpData); 'E8dkVlI  
 if(nCount==1) s?K4::@Fv  
  m_Number.Format("%d picture captured.",nCount); .Lu=16  
 else [76mgj!K  
  m_Number.Format("%d pictures captured.",nCount); f{Y|FjPp=E  
  UpdateData(FALSE); cl7+DAE  
} zck |jhJ6  
f<'&_*7,|t  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ;/{Q4X{  
{ I0jEhg%JZ  
 if(pMsg -> message == WM_KEYDOWN) Iei4yDv ;  
 { J&:0ytG  
  if(pMsg -> wParam == VK_ESCAPE) +TX p;6pA  
   return TRUE; dl$l5z\  
  if(pMsg -> wParam == VK_RETURN) kAk,:a;P  
   return TRUE; GrQAho  
 } <db/. A3  
 return CDialog::PreTranslateMessage(pMsg); t_VHw'~"  
} :* /``  
yb**|[By  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3x9C]  
{ TuCOoz@d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ R;V(D3  
  SaveBmp(); 5BCaE)J  
  return FALSE; 'Jl.fN  
} s3kEux^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {}^ELw  
 CMenu pop; LA@}{hU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;<X3AhF  
 CMenu*pMenu=pop.GetSubMenu(0); '}YXpB  
 pMenu->SetDefaultItem(ID_EXITICON); K :q-[\G  
 CPoint pt; S@"=,Xj M  
 GetCursorPos(&pt); K ;xW/7?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); sBu"$ "]  
 if(id==ID_EXITICON) hA\8&pI;  
  DeleteIcon(); c`}X2u]k  
 else if(id==ID_EXIT) zXf+ieo  
  OnCancel(); a!^wc,  
 return FALSE; A07 P$3>/W  
} +@qk=]3a  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ]D-48o0  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) IFTW,9hh  
 AddIcon(); YXg uw7%\  
 return res; M2EN(Y_k0  
} ?Ru`ma\;  
^{K8uN7  
void CCaptureDlg::AddIcon() aQmL=9  
{ d=KOV;~);  
 NOTIFYICONDATA data; *nW9)T  
 data.cbSize=sizeof(NOTIFYICONDATA); 8k`zMT  
 CString tip; (MIw$)#^  
 tip.LoadString(IDS_ICONTIP); xR&,QrjQG  
 data.hIcon=GetIcon(0); dS&8R1\>1  
 data.hWnd=GetSafeHwnd(); jRkq^}  
 strcpy(data.szTip,tip); "=n8PNV/ c  
 data.uCallbackMessage=IDM_SHELL; ;Gs**BB&  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C;) xjZiR  
 data.uID=98; _~(Xd@c(  
 Shell_NotifyIcon(NIM_ADD,&data); :{ T#M$T  
 ShowWindow(SW_HIDE); pNJM]-D]m~  
 bTray=TRUE; .- Lqo=o\  
} n1/lE)  
Wkk Nyg,  
void CCaptureDlg::DeleteIcon() PC_4#6^5  
{ &"h!SkX/  
 NOTIFYICONDATA data; ,< icW &a  
 data.cbSize=sizeof(NOTIFYICONDATA); uWInx6p  
 data.hWnd=GetSafeHwnd(); .nH /=  
 data.uID=98; kZ.3\  
 Shell_NotifyIcon(NIM_DELETE,&data); )IhY&?jk?  
 ShowWindow(SW_SHOW); GDB>!ukg  
 SetForegroundWindow(); U44H/5/  
 ShowWindow(SW_SHOWNORMAL); +=k|(8Js#  
 bTray=FALSE; *vO'Z &  
} oX4uRc7wR  
GKtQ>39B  
void CCaptureDlg::OnChange() 19u? ^w  
{ Xh/av[Q  
 RegisterHotkey(); ,h._iO)I^  
} p,8Z{mLn  
bN&da [K  
BOOL CCaptureDlg::RegisterHotkey() r?I(me,  
{ nu<!/O  
 UpdateData(); tp^'W7E  
 UCHAR mask=0; _D4}[`  
 UCHAR key=0; a&hM:n4P  
 if(m_bControl) z.^ )r  
  mask|=4; k-e@G'  
 if(m_bAlt) ~QcKW<bz  
  mask|=2; {@$3bQ  
 if(m_bShift) yMkd|1  
  mask|=1; `7_LJ \>I  
  key=Key_Table[m_Key.GetCurSel()]; ~&:R\  
 if(bRegistered){ eFI4(Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \(FDR  
  bRegistered=FALSE; _64@zdL+  
 } -JENY|6  
 cMask=mask; @ 1A_eF  
 cKey=key; ix+x-G  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); i|^6s87"N2  
 return bRegistered; EvmmQ  
} 1W[(+TZ&s  
Q9>]@DrAx  
  四、小结 3@?YTez#  
~Wm}M  
  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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