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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: |AhF7Mj*  
  -~f511<  
  一、实现方法 `RRE(SiKU  
R=j% S!  
  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" lg%j  
3.Gj4/f  
#pragma data_seg("shareddata") /s:fW+C  
HHOOK hHook =NULL; //钩子句柄 bJ /5|E?  
UINT nHookCount =0; //挂接的程序数目 _D7]-3uC!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m#e3%150{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 {D&9UZm  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  UL@9W6  
static int KeyCount =0; s,]%dG!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 v;1F[?@3Y  
#pragma data_seg() kJ:F *34e=  
U/{6% Qy  
  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。 KDP H6  
C(T;>if0NH  
  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: U977#M Xf  
tAu4haa4;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rNOES3[~  
cKey,UCHAR cMask) Ard]147  
{ =}!Mf'  
 BOOL bAdded=FALSE; # uCB)n&.  
 for(int index=0;index<MAX_KEY;index++){ o(kM9G|  
  if(hCallWnd[index]==0){ arK_oh0B  
   hCallWnd[index]=hWnd; {No L  
   HotKey[index]=cKey; a `Q ot  
   HotKeyMask[index]=cMask; d@C&+#QDF  
   bAdded=TRUE;  )v4b  
   KeyCount++; \00DqL(Oj`  
   break; vxQ8t!-u  
  } ~p0c3*  
 } una%[jTc  
 return bAdded; nKr9#JebRC  
} Fm_y&7._  
//删除热键 FCj{AD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^ZDBO/  
{ UYP9c}_,4  
 BOOL bRemoved=FALSE; @F*wg  
 for(int index=0;index<MAX_KEY;index++){ fl\aqtF  
  if(hCallWnd[index]==hWnd){ J8a*s`ik  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'J)2g"T@  
    hCallWnd[index]=NULL; =:,xxqy  
    HotKey[index]=0; e-hjC6Q U  
    HotKeyMask[index]=0; a&{X!:X  
    bRemoved=TRUE; i+3fhV  
    KeyCount--; vl E z9/H  
    break;  $!@\  
   } \!50UVzm)  
  } EpJ4`{4  
 } Z#l%r0(o  
 return bRemoved; T\s)le  
} zLw{ {|  
lq:}0<k  
1SIq[1  
  DLL中的钩子函数如下: r,P1^uHx  
LA3<=R]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )D-c]+yt  
{  _?vo U  
 BOOL bProcessed=FALSE; J T# d(Y  
 if(HC_ACTION==nCode) &hIRd,1#  
 { %6%<?jZ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 8e~|.wOL  
   switch(wParam) FXdD4X)  
   {  xda; K~w  
    case VK_MENU: p{)5k  
     MaskBits&=~ALTBIT; 3VnQnd E  
     break; HS>f1!  
    case VK_CONTROL: X@)z80  
     MaskBits&=~CTRLBIT; C`jM0Q  
     break; ;^Sr"v6r>u  
    case VK_SHIFT: (m[bWdANnW  
     MaskBits&=~SHIFTBIT; M@1r:4CoKH  
     break; vR6Bn  
    default: //judge the key and send message k^ F@X  
     break; 2f`nMW  
   } YT/kC'A  
   for(int index=0;index<MAX_KEY;index++){ PYRd] %X  
    if(hCallWnd[index]==NULL) ^I6^g  
     continue; zjL.Bhiud  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V==z"  
    { SHb(O<6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); spofLu.  
     bProcessed=TRUE; ]&~]#vB#  
    } {4aWR><  
   }  }}<Z,/O  
  } BElJB&I  
  else if((lParam&0xc000ffff)==1){ //有键按下 DD9?V}Yx  
   switch(wParam) nfW&1a  
   { @XD+'{]  
    case VK_MENU: 8.=\GV  
     MaskBits|=ALTBIT; \,Lo>G`!  
     break; 'D1A}X  
    case VK_CONTROL: >N\0"F7.  
     MaskBits|=CTRLBIT; &M/0g]4p  
     break; kU-t7'?4  
    case VK_SHIFT: w6dFb6~R  
     MaskBits|=SHIFTBIT; 9vNkZ-1  
     break; + 1IQYa|  
    default: //judge the key and send message FOwDp0  
     break; (R~]|?:wt  
   } e6B{QP#jq  
   for(int index=0;index<MAX_KEY;index++){  8@{OR"Ec  
    if(hCallWnd[index]==NULL) kPBV6+d~  
     continue; {K{EOB_u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xd E`d.  
    { r,goRK.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Hd7,ZHj3 ^  
     bProcessed=TRUE; C9DJO:f.2y  
    } H2xeP%;$  
   } o`zr>  
  } :!;'J/B@..  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 I|-p3g8\  
   for(int index=0;index<MAX_KEY;index++){ ?;YC'bF  
    if(hCallWnd[index]==NULL) @pI5lh  
     continue; f=!PllxL:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CxhY$%C (L  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d8SE,A&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 m\>a,oZH  
   } %B 5r"=oO  
  } 'evj,zFhW  
 } l:6,QaT1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @=]~\[e\  
} ~1m2#>  
R8L_J6Kpa  
  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: u JR%0E7!  
U`Jy!x2m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .O*bILU  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )4?x5#  
Ed0IWPx  
  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: 9jp:k><\(c  
?T_3n:  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E+"dqSI/v  
{ < _$%@4 L  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) b96%")  
 { B()/.w?A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 fW`&'!  
  SaveBmp(); kY,U8a3!  
  return FALSE; 1CPjil*eb  
 } Iq+>qX   
 …… //其它处理及默认处理 D47R  
} dt[k\ !-v  
mDGn:oRj  
@cRZk`|1n  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 wi8Yl1p]!z  
}~h'FHCC+  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 6~#Ih)K  
HIGq%m=-x  
  二、编程步骤 ]Mj/&b>"e  
@`-[;?>  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 6OiSK@<Hk  
[U#72+K  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 58%'UwKn  
?6c-7QV  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; P^MOx4  
G5dO 3lwq  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; q(5j(G ;  
O=)  
  5、 添加代码,编译运行程序。 b,P]9$Ut  
~ `>e5OgOJ  
三、程序代码 /2{5;  
'`Bm'Dd  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :[@ k<8<]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) z 3t~}aL  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ o ]Jv;Iy@?  
#if _MSC_VER > 1000 s{ V*1$e~  
#pragma once Q "oI])r  
#endif // _MSC_VER > 1000 \^1+U JU  
#ifndef __AFXWIN_H__ L.xZ_ 6  
#error include 'stdafx.h' before including this file for PCH xX0-]Y h:  
#endif Cp^@zw*/  
#include "resource.h" // main symbols d"G+8}.4  
class CHookApp : public CWinApp <J(sR  
{ h0?2j)X_  
 public: jNwjK0?  
  CHookApp(); &X9Z W$C  
  // Overrides e98lhu"|H  
  // ClassWizard generated virtual function overrides %or,{mmiM:  
  //{{AFX_VIRTUAL(CHookApp) ,1q_pep~?%  
 public: _qvK*nE  
  virtual BOOL InitInstance(); t3Z_Dp~\  
  virtual int ExitInstance(); uUE9g  
  //}}AFX_VIRTUAL %2'A pp  
  //{{AFX_MSG(CHookApp) S1n3(U:m  
  // NOTE - the ClassWizard will add and remove member functions here. j4FeSGa  
  // DO NOT EDIT what you see in these blocks of generated code ! KPSh#x&I  
  //}}AFX_MSG oHM ]  
  DECLARE_MESSAGE_MAP() |vte=)%  
}; &"_u}I&\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ERUt'1F?]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `<^VR[Mx  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K.C> a:J  
BOOL InitHotkey(); 0.r4f'vk  
BOOL UnInit(); 0s#vwK13  
#endif }MR1^  
7;.xc{  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [w -{r+[  
#include "stdafx.h" oMcK`%ydm  
#include "hook.h" gADmN8G=  
#include <windowsx.h> sGY_{CZ:  
#ifdef _DEBUG k>}g\a,  
#define new DEBUG_NEW rA0,`}8\  
#undef THIS_FILE N-lGa@ j  
static char THIS_FILE[] = __FILE__; 6*9}4`  
#endif 0U66y6  
#define MAX_KEY 100 )PkNWj6%y  
#define CTRLBIT 0x04 -B#yy]8  
#define ALTBIT 0x02  g]*  
#define SHIFTBIT 0x01 eRbGZYrJ  
#pragma data_seg("shareddata") ^n#1<K[E  
HHOOK hHook =NULL; ]!:oYAm  
UINT nHookCount =0; qo+N,x9o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &m3.h!dq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT tg4Y i|5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey zWw2V}U!  
static int KeyCount =0; w)E@*h<Z  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift VS#wl|b8  
#pragma data_seg() QYXx:nIrg  
HINSTANCE hins; I~PDaZP  
void VerifyWindow(); {"*VU3%q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "`}~~.q  
//{{AFX_MSG_MAP(CHookApp) p6EDQwlf  
// NOTE - the ClassWizard will add and remove mapping macros here. +c:3o*  
// DO NOT EDIT what you see in these blocks of generated code! 4A{|[}!  
//}}AFX_MSG_MAP nU+tM~C%a  
END_MESSAGE_MAP() g}&hl"j  
n?#!VN3  
CHookApp::CHookApp() Z>F^C}8f  
{ C7T(+Wd!,  
 // TODO: add construction code here, @J[6,$UVu  
 // Place all significant initialization in InitInstance LW#M@  
} SEQ%'E5-'  
T1B|w"In  
CHookApp theApp; ZWc+),X  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s30 O@M))  
{ P7r'ffA  
 BOOL bProcessed=FALSE; IC/(R! Crj  
 if(HC_ACTION==nCode) +]>+a<x*%  
 { 39 e;  
  if((lParam&0xc0000000)==0xc0000000){// Key up tc_f;S`k  
   switch(wParam) L;_c|\%  
   { h*0S$p<[1  
    case VK_MENU: {s,+^7  
     MaskBits&=~ALTBIT; <j}lp-  
     break; 0?7XtC P<  
    case VK_CONTROL: PZ:u_*Vu`  
     MaskBits&=~CTRLBIT; I^*'.z!4Q  
     break; 1`f_P$&Z_J  
    case VK_SHIFT: @ \.;b9  
     MaskBits&=~SHIFTBIT; "SWMk!  
     break; !2Dy_U=  
    default: //judge the key and send message |ifHSc.j<  
     break; sfp,Lq`  
   } 9z m|Lbj  
   for(int index=0;index<MAX_KEY;index++){ m(D]qYwh  
    if(hCallWnd[index]==NULL) X{Yw+F,j  
     continue; >QQ(m\a$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U IJx*  
    { x9>\(-uU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); '6Qy/R  
     bProcessed=TRUE; qg z*'_S  
    } NCeaL-y7  
   } ~+D*:7Y_  
  } 5`^o1nGO'  
  else if((lParam&0xc000ffff)==1){ //Key down {mYP<NBT  
   switch(wParam) [c K^+s)N  
   { !}TMiCK  
    case VK_MENU: =1/NFlt8  
     MaskBits|=ALTBIT; ]7sx;KFv  
     break; 6,Hqb<(  
    case VK_CONTROL: 1.@vS&Y7OE  
     MaskBits|=CTRLBIT; \ v@({nB8  
     break; n_[i0x7#  
    case VK_SHIFT: .W\ve>;  
     MaskBits|=SHIFTBIT; Df07y<>7Q  
     break; 1N`vCt]w  
    default: //judge the key and send message @`u?bnx]e  
     break; KHiFJ_3  
   } \jW)Xy  
   for(int index=0;index<MAX_KEY;index++) KM?1/KZ/~  
   { R5Yl1   
    if(hCallWnd[index]==NULL) /z."l!u6  
     continue; 7D"%%|: h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D  _X8-  
    { &!.HuRiuC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iMP  
     bProcessed=TRUE; n/e BE q  
    } ?4t-caK^u  
   } <~Q i67I  
  } U0B2WmT~Q  
  if(!bProcessed){  GrJ#.  
   for(int index=0;index<MAX_KEY;index++){ UP1?5Q=H]Q  
    if(hCallWnd[index]==NULL) cleOsj;S  
     continue; 2F_ R/{D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?v]-^X=&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rp! LP#*  
   } E,G<_40  
  } ;#?M)o:q  
 } ucYkxi`x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ry;$^.7%  
} Q ~|R Z7G  
O_@2;iD^^  
BOOL InitHotkey() T(X:Yw  
{ -mNQ;zI1  
 if(hHook!=NULL){ IY(h~O  
  nHookCount++; `{<frB@  
  return TRUE; 4z4v\IpB  
 } o.:p_(|hI  
 else S 4vbN  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 85U.wpG  
  if(hHook!=NULL) O??vm?eo  
   nHookCount++; 'E]A.3-Mt  
  return (hHook!=NULL); Ng<1Sd|MV  
} :{g7lTM  
BOOL UnInit() g#^|oYuH6  
{ 9V!-ZG  
 if(nHookCount>1){ `_AM` >_  
  nHookCount--; HQVh+(  
  return TRUE; 0A$SYF$O+[  
 } oN2=DYC41  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,\ldz(D?+  
 if(unhooked==TRUE){ CDg AGy  
  nHookCount=0; SBKeb|H8  
  hHook=NULL; rnhFqNT:  
 } Bt~s*{3$8  
 return unhooked; E{^^^"z P  
} :xeLt;  
*_hLD5K!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L ^Y3=1#"g  
{ ;_JH:}j  
 BOOL bAdded=FALSE; =V$j6  
 for(int index=0;index<MAX_KEY;index++){ s"#]L44N  
  if(hCallWnd[index]==0){ /0==pLa4  
   hCallWnd[index]=hWnd; ~uaP$*B[  
   HotKey[index]=cKey; 90:K#nW;  
   HotKeyMask[index]=cMask; tm)*2lH6  
   bAdded=TRUE; ~t/JCxa  
   KeyCount++; tB6k|cPC  
   break; hY;_/!_  
  } 8[5|_Eh+  
 } Lyoor1   
 return bAdded; QXQ  
} 3;/?q  
,+L KJl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) \2DE ==M)P  
{ }C6@c1myq-  
 BOOL bRemoved=FALSE; Q7Ij4  
 for(int index=0;index<MAX_KEY;index++){ c?6d2jH.  
  if(hCallWnd[index]==hWnd){ \KM|f9-b  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F-0UdV  
    hCallWnd[index]=NULL; H^(L90  
    HotKey[index]=0; v[#)GB _5  
    HotKeyMask[index]=0; }=@zj6AC  
    bRemoved=TRUE; T0 |H9>M  
    KeyCount--; P#tvm,  
    break; tHI*,  
   } "DckwtG:%  
  } 1bRL"{m^)-  
 } &4kM8Qh  
 return bRemoved; R2^iSl%pj  
} k/`i6%F#m  
<MZi<Z`  
void VerifyWindow() P^IY: -s  
{  (K #A  
 for(int i=0;i<MAX_KEY;i++){ ])$S\fFm  
  if(hCallWnd!=NULL){ {+=i?  
   if(!IsWindow(hCallWnd)){ `SOhG?Zo  
    hCallWnd=NULL; {'~sS  
    HotKey=0; ,IjdO(?TC  
    HotKeyMask=0; o/JPYBhdl  
    KeyCount--; k&GHu0z  
   } a!t V6H  
  } *T4ge|zUc  
 } 7%CIt?Z%  
} :kp0EiJ  
u%opY<h  
BOOL CHookApp::InitInstance() 0xBY(#;Q  
{ 60PYCqWc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); N$Hqa^!'T  
 hins=AfxGetInstanceHandle(); ryEvmWYu  
 InitHotkey(); t<lyg0f  
 return CWinApp::InitInstance(); 5Rs?CVVb  
} 7Po/_%  
s/ S+ ec3  
int CHookApp::ExitInstance() L?f qcW{  
{ 1URsHV!xcM  
 VerifyWindow(); bOXh|u_3i  
 UnInit(); ZjD2u 8e  
 return CWinApp::ExitInstance(); @3 "DBJ  
} 2u&c &G  
tc/jY]'32  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file dofR)"<p,^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E& ]_U$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^ wQcB  
#if _MSC_VER > 1000 Q-Y@)Mf~?0  
#pragma once \UQ],+H  
#endif // _MSC_VER > 1000 @Z2/9K%1'  
)dg UmN  
class CCaptureDlg : public CDialog 0*{p Oe/u  
{ ):E'`ZP!F  
 // Construction $K=z  
 public: S ljZ~x,!  
  BOOL bTray; mh8nlB  
  BOOL bRegistered; h.LSMU (O  
  BOOL RegisterHotkey(); B}5XRgq  
  UCHAR cKey; ,CW%JIM  
  UCHAR cMask; L&HzN{K  
  void DeleteIcon(); }2xb&6g~o  
  void AddIcon(); o}R|tOe  
  UINT nCount; :eLLDp<  
  void SaveBmp(); 2o}8W7y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor }q x(z^  
  // Dialog Data :+A; TV  
  //{{AFX_DATA(CCaptureDlg) "GBUQ}  
  enum { IDD = IDD_CAPTURE_DIALOG }; <Am^z~[  
  CComboBox m_Key; -AeHY'T  
  BOOL m_bControl; tQnJS2V"{u  
  BOOL m_bAlt; _ ^3@PM>  
  BOOL m_bShift; KqY>4tb  
  CString m_Path; |Kn^w4mN  
  CString m_Number; cFxSDTR  
  //}}AFX_DATA [r~~=b7*[  
  // ClassWizard generated virtual function overrides  RA~_]Hk  
  //{{AFX_VIRTUAL(CCaptureDlg) @f'AWeJ2  
 public: ;@O(z*14@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); %w%zv2d  
 protected: ,,2_/u\"/i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L`bo#,eg6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ~l4Q~'  
  //}}AFX_VIRTUAL 6KBHRt  
  // Implementation .=aMjrME  
 protected: 3?6Ber y=  
  HICON m_hIcon; CCwK8`%   
  // Generated message map functions w5=EtKTi  
  //{{AFX_MSG(CCaptureDlg) *Ag,kW"  
  virtual BOOL OnInitDialog();  A8`orMo2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Jz2 q\42q  
  afx_msg void OnPaint(); n%Rjt!9  
  afx_msg HCURSOR OnQueryDragIcon(); <m9JXO:5  
  virtual void OnCancel(); M%77u=m  
  afx_msg void OnAbout(); ~l@%=/m  
  afx_msg void OnBrowse(); {.%0@{Y  
  afx_msg void OnChange(); /iTH0@Kw;  
 //}}AFX_MSG N}1-2  
 DECLARE_MESSAGE_MAP() .y(@Y6hO  
}; ^W{eO@  
#endif Is~yVB02  
f(W,m >.;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file &<OMGGQ[h  
#include "stdafx.h" ; vhnA$'a  
#include "Capture.h" ob)D{4B'  
#include "CaptureDlg.h" 7{8)ykBU^  
#include <windowsx.h> 13]y)(  
#pragma comment(lib,"hook.lib") 34^Q5B~^J  
#ifdef _DEBUG SwQOFE/Dv~  
#define new DEBUG_NEW @V*au:  
#undef THIS_FILE U@MOvW)  
static char THIS_FILE[] = __FILE__; P}b Dn;  
#endif \>_eEZ5  
#define IDM_SHELL WM_USER+1 <kk'v'GW@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 72% {Wh/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~9]Vy (L  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1gO//fdI  
class CAboutDlg : public CDialog IrUpExJ  
{ 9 ?[4i'  
 public: _qdWQFuM  
  CAboutDlg(); ^O?l9(=/u  
  // Dialog Data Z7ZWf'o  
  //{{AFX_DATA(CAboutDlg) aj+zmk~-  
  enum { IDD = IDD_ABOUTBOX }; I%C]>ZZh  
  //}}AFX_DATA y;*My#  
  // ClassWizard generated virtual function overrides A Z]Z,s6  
  //{{AFX_VIRTUAL(CAboutDlg) 6NP`P jR  
 protected: Gf!t< =T   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %Gnd"SGs  
  //}}AFX_VIRTUAL nT(!HDH  
  // Implementation d;IJ0xB+by  
 protected: F12S(5Z0%  
  //{{AFX_MSG(CAboutDlg) 6i55Ja  
  //}}AFX_MSG ..sJtA8  
  DECLARE_MESSAGE_MAP() K>`m_M"LA  
}; !;6W!%t.|  
DWHOS XA4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) S;G"L$&\  
{ 75' Ua$  
 //{{AFX_DATA_INIT(CAboutDlg) ;g!xQvcR  
 //}}AFX_DATA_INIT w?*'vF_2:#  
} 4"rb&$E   
7 B4w.P,B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) m3x!*9h  
{ @|JPE%T   
 CDialog::DoDataExchange(pDX); )[F46?$vrk  
 //{{AFX_DATA_MAP(CAboutDlg) jLpgWt`8)E  
 //}}AFX_DATA_MAP xUV_2n+  
} gogl[gHO  
U!3uaz'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &^"s=g.  
 //{{AFX_MSG_MAP(CAboutDlg) jKe$&.q@  
 // No message handlers >:(6{}b  
 //}}AFX_MSG_MAP =Td#2V;0  
END_MESSAGE_MAP() #h}IUR  
OpbszSl"y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Jc9@VxWY  
: CDialog(CCaptureDlg::IDD, pParent) _S[Rvb1e   
{ F=P+;%.  
 //{{AFX_DATA_INIT(CCaptureDlg) Mr@<ZTw  
  m_bControl = FALSE; hJs&rpN  
  m_bAlt = FALSE; UeIqAG8  
  m_bShift = FALSE; mCZF5r  
  m_Path = _T("c:\\"); #w[q.+A  
  m_Number = _T("0 picture captured."); m&;zLBA;  
  nCount=0; Rq~ >h99M  
  bRegistered=FALSE; n:{-Vvt  
  bTray=FALSE; 6ba2^3GH  
 //}}AFX_DATA_INIT W,L>'$#pM  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 U/ v"?pg[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "1=.5:yG  
} D~t"9Z\  
E#WjoIk  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }-k_?2"A  
{ 98<bF{#0WM  
 CDialog::DoDataExchange(pDX); h[M6.  
 //{{AFX_DATA_MAP(CCaptureDlg) AOq9v~)z-  
  DDX_Control(pDX, IDC_KEY, m_Key); ^loF#d= s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |R:v<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3/#R9J#  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <%5-Pzp  
  DDX_Text(pDX, IDC_PATH, m_Path); ` :B  
  DDX_Text(pDX, IDC_NUMBER, m_Number); kfG65aa>_  
 //}}AFX_DATA_MAP [7ek;d;'t  
} B[2h   
I=3B 5u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ".Q!8j"@f  
//{{AFX_MSG_MAP(CCaptureDlg) 'IqK M  
 ON_WM_SYSCOMMAND() .j]OO/,  
 ON_WM_PAINT() D{3 x}5  
 ON_WM_QUERYDRAGICON() Z n"TG/:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) vi()1LS/!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) e{#a{`?Uez  
 ON_BN_CLICKED(ID_CHANGE, OnChange) %^)JaEUC  
//}}AFX_MSG_MAP nOL 25Y:  
END_MESSAGE_MAP() fTi{oY,zTg  
OGD8QD  
BOOL CCaptureDlg::OnInitDialog() Oujlm|  
{ f"OA Zji  
 CDialog::OnInitDialog(); hIg, 0B  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); \M1M2(@pDJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); MSrY*)n!>O  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G Yy!`E  
 if (pSysMenu != NULL) e P,XH{s  
 { LbmB([p  
  CString strAboutMenu; wb}N-8x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6vp8LNSW  
  if (!strAboutMenu.IsEmpty()) +h9l %Pz  
  { + X|m>9  
   pSysMenu->AppendMenu(MF_SEPARATOR); Wvzzjcr(j  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ]R3pBC"Jv  
  } olQ8s *  
 } AD4L`0D  
 SetIcon(m_hIcon, TRUE); // Set big icon 7.Kjg_N#Tr  
 SetIcon(m_hIcon, FALSE); // Set small icon e*'|iuDrY  
 m_Key.SetCurSel(0); }i/2XmA )  
 RegisterHotkey(); c<t3y7  
 CMenu* pMenu=GetSystemMenu(FALSE); z)?#UdBQv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %NAFU /&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X6"^:)&1M  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); yADN_  
 return TRUE; // return TRUE unless you set the focus to a control Eg- Mm4o  
} 6pdl,5[x-  
Lb3K};SIV  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 2 vJ[vsrFv  
{ 0qV*d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) fG[3%e  
 { DJ2]NA$Q*  
  CAboutDlg dlgAbout; |?t8M9[Z  
  dlgAbout.DoModal(); {dr&46$p  
 } zL!~,B8C  
 else (gJ )]/n  
 { .8uwg@yD  
  CDialog::OnSysCommand(nID, lParam); 5}l#zj  
 } {J6sM$aj  
} F~rY jAFTi  
RNrYT|  
void CCaptureDlg::OnPaint() ek.WuOs  
{ aSj1P/A  
 if (IsIconic()) hhgz=7Y  
 { 1&dsQ, VDl  
  CPaintDC dc(this); // device context for painting Hk~ gcG  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); :`"T Eif  
  // Center icon in client rectangle ))+9 8iU1s  
  int cxIcon = GetSystemMetrics(SM_CXICON); EwBN+v;)  
  int cyIcon = GetSystemMetrics(SM_CYICON); tP^mq>  
  CRect rect; p31rhe   
  GetClientRect(&rect); 8iH;GFNJ7'  
  int x = (rect.Width() - cxIcon + 1) / 2; L) nVpqm   
  int y = (rect.Height() - cyIcon + 1) / 2; BnnUUaE  
  // Draw the icon q?]@' ^:;  
  dc.DrawIcon(x, y, m_hIcon); )D-.7m.v]  
 } sq6%=(q(?  
 else Sph"w08  
 { o_KcnVQ\  
  CDialog::OnPaint(); )s7Tv#[  
 } mP .&fS  
} dK(%u9v  
j{w,<Wt>  
HCURSOR CCaptureDlg::OnQueryDragIcon() eYX_V6c  
{ ~m09yc d<  
 return (HCURSOR) m_hIcon; (>5VS  
}  yLIj4bf  
:AcN b  
void CCaptureDlg::OnCancel() t~W4o8<w  
{ % oL&~6l$  
 if(bTray) SoGLsO+R  
  DeleteIcon(); f]6` GsE  
  CDialog::OnCancel(); [W|7r n,q  
} 7 te!>gUW  
~Z/`W`  
void CCaptureDlg::OnAbout() WUK.>eM0  
{ =O:ek#Bp  
 CAboutDlg dlg; 4Z p5o`*g2  
 dlg.DoModal(); .dLX'84fY  
} Gv nclnG  
V7'x? pt  
void CCaptureDlg::OnBrowse() r ~!%w(N|M  
{ D}/.;]w<[&  
 CString str; gx9sBkoq5D  
 BROWSEINFO bi; *]| JX&  
 char name[MAX_PATH]; T2PFE4+Dp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); a1sLRqo8  
 bi.hwndOwner=GetSafeHwnd(); 7<'i#E~  
 bi.pszDisplayName=name; vKOn7  
 bi.lpszTitle="Select folder"; 6{r[Dq  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /ZN5WK  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); wQuaB6E  
 if(idl==NULL) sU_4+Mk  
  return; ]fS~N9B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &OR*r7*Z  
 str.ReleaseBuffer(); ,) jB<`  
 m_Path=str;  eV=sDx  
 if(str.GetAt(str.GetLength()-1)!='\\') ./*,Thc  
  m_Path+="\\"; >Pd23TsN  
 UpdateData(FALSE); JP*wi-8D  
} Y'H/ $M N  
PL_wa(}y]D  
void CCaptureDlg::SaveBmp() 3rdxXmx  
{ 2DqHqq9m  
 CDC dc; SK}g(X7IWH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); kQ'xs%Fw  
 CBitmap bm; ? /X6x1PN  
 int Width=GetSystemMetrics(SM_CXSCREEN); MC)W?  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y +yvv{01  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !4cdP2^P  
 CDC tdc; OxGCpbh*7o  
 tdc.CreateCompatibleDC(&dc); G:ngio]G0  
 CBitmap*pOld=tdc.SelectObject(&bm); #_sVB~sn@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "EkO>M/fr  
 tdc.SelectObject(pOld); >5:e1a?9  
 BITMAP btm; fTtSx_}3H  
 bm.GetBitmap(&btm); vjRD?kF  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; x(N} ^Hu  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X.Y)'qSf  
 BITMAPINFOHEADER bih; 1L qJ@v0  
 bih.biBitCount=btm.bmBitsPixel; rL/7wa  
 bih.biClrImportant=0; He;%6OG{  
 bih.biClrUsed=0; ]H'82a  
 bih.biCompression=0; *G|]5  
 bih.biHeight=btm.bmHeight; l8lR5<  
 bih.biPlanes=1; .Tqvy)'  
 bih.biSize=sizeof(BITMAPINFOHEADER); wTbIS~!gF  
 bih.biSizeImage=size; yVv3S[J  
 bih.biWidth=btm.bmWidth; !)3Su=*R  
 bih.biXPelsPerMeter=0; ):EXh#  
 bih.biYPelsPerMeter=0; 0nnq/u^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @<JQn^M  
 static int filecount=0; 4DM|OL`w  
 CString name; 5)i0g  
 name.Format("pict%04d.bmp",filecount++); ?S:_J!vX{  
 name=m_Path+name; Q</HFpE  
 BITMAPFILEHEADER bfh; +%$V?y (  
 bfh.bfReserved1=bfh.bfReserved2=0; "jMnYEG  
 bfh.bfType=((WORD)('M'<< 8)|'B'); x)mC^  
 bfh.bfSize=54+size; 9Bw5 t@  
 bfh.bfOffBits=54; w~?eX/;  
 CFile bf; r_RTtS#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h!%`odl%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); d/QM   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); A8Y~^wn  
  bf.WriteHuge(lpData,size); T`[ZNq+${  
  bf.Close(); (W/UR9x)|d  
  nCount++; ,dMi+c`ax  
 } dj**,*s  
 GlobalFreePtr(lpData); ,R6$SrNcd  
 if(nCount==1) ZWEzL$VWi  
  m_Number.Format("%d picture captured.",nCount); ) hB*Hjh  
 else <L#r6y~H  
  m_Number.Format("%d pictures captured.",nCount); t4f\0`jN  
  UpdateData(FALSE); VO?NrKyeW  
} :?W:'% (`[  
"evV/Fg (  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) &" n9,$  
{ >9|+F [Fc  
 if(pMsg -> message == WM_KEYDOWN) )Q?[_<1Y+  
 { lI<8)42yq  
  if(pMsg -> wParam == VK_ESCAPE) kO"aE~  
   return TRUE; -e\56%\~_  
  if(pMsg -> wParam == VK_RETURN) Vk T3_f  
   return TRUE; f#b[KB^Z,2  
 } G dY^}TJrh  
 return CDialog::PreTranslateMessage(pMsg); "S#hzrEdYI  
} z H4#\d  
7J/3O[2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) A*;h}\n  
{ m q9&To!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ V@f#/"u'  
  SaveBmp(); P .(X]+  
  return FALSE; [wYQP6Cyy  
} @S):a`J  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <Ux;dekz}  
 CMenu pop; :gv#_[k  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8G<.5!f7`N  
 CMenu*pMenu=pop.GetSubMenu(0); I ]1fH  
 pMenu->SetDefaultItem(ID_EXITICON); .?NAq[H%  
 CPoint pt; vkmR cX:/  
 GetCursorPos(&pt); -&tiM v  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =p$Wo  
 if(id==ID_EXITICON) 1t'\!  
  DeleteIcon(); Ne_>%P|I_  
 else if(id==ID_EXIT) ')<$AMy1  
  OnCancel(); 5o #8DIal  
 return FALSE; _;W|iUreb  
} }qPo%T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8^T$6A[b  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) P*]g*&*Y +  
 AddIcon(); ;oE4,  
 return res; ;_*F [ }w  
} K)OlCpHc  
%Kp}Wo6  
void CCaptureDlg::AddIcon() (FHh,y~v  
{ k/O&,T77}J  
 NOTIFYICONDATA data; !^\/ 1^  
 data.cbSize=sizeof(NOTIFYICONDATA); krU2S-  
 CString tip; |{Q,,<C  
 tip.LoadString(IDS_ICONTIP); .jw)e!<\N  
 data.hIcon=GetIcon(0);  VVY\W!  
 data.hWnd=GetSafeHwnd(); +a;j>hh  
 strcpy(data.szTip,tip); i|Wn*~yFOO  
 data.uCallbackMessage=IDM_SHELL; RJM(+5xQ|  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Fjb[Ev  
 data.uID=98; d-aF-  
 Shell_NotifyIcon(NIM_ADD,&data); hRu%> =7  
 ShowWindow(SW_HIDE); L_|Y_=r."  
 bTray=TRUE; +/tD$  
} GS%Dn^l  
I'wAgf6W  
void CCaptureDlg::DeleteIcon() eF@E|kK  
{ fCR;Fk2B  
 NOTIFYICONDATA data; i`;I"oY4  
 data.cbSize=sizeof(NOTIFYICONDATA); 1;V5b+b  
 data.hWnd=GetSafeHwnd(); g&V.o5jIhc  
 data.uID=98; Xqk$[ peS  
 Shell_NotifyIcon(NIM_DELETE,&data); oGZ9@Y)(T  
 ShowWindow(SW_SHOW); DS fKUx&  
 SetForegroundWindow(); HS7!O  
 ShowWindow(SW_SHOWNORMAL); Mv3Ch'X[  
 bTray=FALSE; @@QU"8q  
} .Pi67Kj,  
>Ko )Z&j9W  
void CCaptureDlg::OnChange() rYJvI  
{ I uDk9<[b:  
 RegisterHotkey(); $oEDyC  
} >KJ]\`2>)c  
gMbvHlT  
BOOL CCaptureDlg::RegisterHotkey() Z[VKB3Pb8  
{ g@L4G?hLn  
 UpdateData(); (Lp-3Xx  
 UCHAR mask=0; t/CNxfY  
 UCHAR key=0; 2_Qzc&"[ 4  
 if(m_bControl) 2S tpcAlU}  
  mask|=4; n_Z8%|h  
 if(m_bAlt) c=gUY~Rl  
  mask|=2; EMo6$(  
 if(m_bShift) "M tQj}  
  mask|=1; >*MB_m2|  
  key=Key_Table[m_Key.GetCurSel()]; 6dh PqL  
 if(bRegistered){ Velmq'n  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); foeVjL:T  
  bRegistered=FALSE; t j0vB]c  
 } g7pFOcV  
 cMask=mask; =[,adB  
 cKey=key; jn[a23;G)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); iX28+weH  
 return bRegistered; ':=C2x1d|  
} t65!2G"<  
{SJLM0=Z  
  四、小结 c?d#Bj ?  
TJ<PT  
  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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