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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: 6<@ mB Z  
  ;|K }  
  一、实现方法 Xc+YoA0Ez  
xJ<RQCW$  
  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: ^/Hf$tYI!`  
hpQ #`rhn  
#pragma data_seg("shareddata") 1q;R+65  
HHOOK hHook =NULL; //钩子句柄  6 wd  
UINT nHookCount =0; //挂接的程序数目 '{0O!y[H6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 P'iX?+*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 g@x72$j  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey vE`;1UA}  
static int KeyCount =0; cFie;k  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 j)G%I y[`  
#pragma data_seg() m\*ca3$  
bv <^zuV  
  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。 ?1g`'q@T%  
o#"yFP1  
  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: +s_a{iMVP  
Zbl*U(KU?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR *0oa2fz%  
cKey,UCHAR cMask) *DcIC]ao[  
{ AHr^G'  
 BOOL bAdded=FALSE; /V0Put  
 for(int index=0;index<MAX_KEY;index++){ ]u<U[l-w  
  if(hCallWnd[index]==0){ 4 dHGU^#WZ  
   hCallWnd[index]=hWnd; EO(l?Fgw]$  
   HotKey[index]=cKey; ?r =`Kl  
   HotKeyMask[index]=cMask; t,TlW^-  
   bAdded=TRUE; g_ep 5#\D  
   KeyCount++; 7V^j9TC  
   break; K8KN<Q s]  
  } E9k%:&]vd  
 } |:SV=T:  
 return bAdded; |Zn;O6c#L5  
} "1""1";  
//删除热键 wY8Vc"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GZ<@#~1%\  
{ _[8JSw7  
 BOOL bRemoved=FALSE; >9XG+f66E  
 for(int index=0;index<MAX_KEY;index++){ C% z9Q  
  if(hCallWnd[index]==hWnd){ qm#?DSLap  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ j/O9LygB  
    hCallWnd[index]=NULL; ^{J^oZ'%~  
    HotKey[index]=0; <NDV 5P  
    HotKeyMask[index]=0; 44n41.Q]  
    bRemoved=TRUE; U1 3Lsky%  
    KeyCount--; A"DGn  
    break; -mO<(wfV>  
   } x-@?:P*  
  } n9 bp0#K  
 } G~_eBy  
 return bRemoved; ;[lLFI  
} >g+Y//Z  
ej7N5~!,s  
6}@T^?  
  DLL中的钩子函数如下: UCmJQJc  
.FYRi_Zd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) h+d k2|a  
{ )y!gApNs"  
 BOOL bProcessed=FALSE; 3bLOT#t  
 if(HC_ACTION==nCode) e7iQG@i7  
 { 6t <[-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 X,M!Tp  
   switch(wParam) ~ D/Lo$K"  
   {  $0{ h Uex  
    case VK_MENU: }|-8- ;  
     MaskBits&=~ALTBIT; B~Z61   
     break;  j AoI`J  
    case VK_CONTROL: "AqLR  
     MaskBits&=~CTRLBIT; `{yD\qDyX  
     break; <Qbqxw  
    case VK_SHIFT: zB7 ^L^Y  
     MaskBits&=~SHIFTBIT; u ?F},VL;  
     break; "a _S7K  
    default: //judge the key and send message Zq: }SU  
     break; W }Ll)7(|T  
   } [N*S5^>1  
   for(int index=0;index<MAX_KEY;index++){  OvC@E]/+  
    if(hCallWnd[index]==NULL) MD;,O3Ge  
     continue; &H,UWtU+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g C8 deC8  
    { PHez5}T  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); iN Lt4F[i  
     bProcessed=TRUE; ),o=~,v:  
    } \/wk!mWV@  
   } BD.l5 ~:  
  } :hB6-CZkqN  
  else if((lParam&0xc000ffff)==1){ //有键按下 A[Ce3m  
   switch(wParam) .ezko\nU  
   { b V_<5PHP  
    case VK_MENU: rCGKE`H  
     MaskBits|=ALTBIT; Q[!?SSX%  
     break; v!S(T];)  
    case VK_CONTROL: F_}y[Yn^  
     MaskBits|=CTRLBIT; } ?+0s=Z  
     break; I_Gm2 Dd  
    case VK_SHIFT: q|lP?-j  
     MaskBits|=SHIFTBIT; d n%'bt  
     break; RXWdqaENx  
    default: //judge the key and send message  KI\ 9)  
     break; A|mE3q=  
   } q`|E9  
   for(int index=0;index<MAX_KEY;index++){ su60j^e*  
    if(hCallWnd[index]==NULL) EcR[b@YI  
     continue; t1#f*G5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k9y/.Mu  
    { >FFp"%%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0!c/4^  
     bProcessed=TRUE; kmJ<AnK  
    } tsB}'+!v#  
   } g]b%<DJ  
  } 21?>rezJ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  pXNH  
   for(int index=0;index<MAX_KEY;index++){ aO:A pOAO  
    if(hCallWnd[index]==NULL) xy)W_~Mk  
     continue; :W'.SRD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) JV;VR9-l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -S@ ys  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 v49 i.c9  
   } 1 !.P H   
  } I=E\=UTG,5  
 } ;$r!eFY;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Nw1 .x  
} *z'Rl'j9[  
hz2f7g  
  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: 4l{La}Aj  
fhHTp_u)2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P6'0:M@5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~4S6c=:  
} f!wQx b  
  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: 7,{!a56zX  
\3t)7.:4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) AUU(fy#<  
{ b Sg]FBaW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ;UQ&yj%x  
 { TU2MG VYy  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Pi[(xD8  
  SaveBmp(); M%eTNsbNm  
  return FALSE; lzz68cT  
 } =*WfS^O  
 …… //其它处理及默认处理 fb!>@@9Z  
} 8L))@SA+uJ  
w (,x{Bg\  
NC x)zJ\S  
  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。 UXS+GAWU  
p!(]`N   
  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。 cPl$N5/5  
cc3+ Wx_  
  二、编程步骤 _ =(v? 2:?  
K+U0YMRmz  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; cn ;2&  
;sSRv9Xb  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \D! I"mr  
g+k yvI7o  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Ys%d  
x1`Jlzrp,  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; j+3=&PkA.]  
)5U7w  
  5、 添加代码,编译运行程序。 [4}U*\/>C  
*_uGzGB&G  
三、程序代码 ^s/f.#'  
kPp7;U2A  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6)3pnhG9  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |=Pw -uk  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^+dL7g?+  
#if _MSC_VER > 1000 eG5xJA^  
#pragma once KlRIJOS  
#endif // _MSC_VER > 1000 eKqo6P:#f  
#ifndef __AFXWIN_H__ f:A1j\A?  
#error include 'stdafx.h' before including this file for PCH 5bprhq-7  
#endif k?Iq 6  
#include "resource.h" // main symbols 0~nub  
class CHookApp : public CWinApp MJ@PAwv"  
{ rge/qUr/^  
 public: :LR>U;2  
  CHookApp(); SDW!9jm>R  
  // Overrides @(e/Y/  
  // ClassWizard generated virtual function overrides TP)}1 @  
  //{{AFX_VIRTUAL(CHookApp) safI`b w1  
 public: hzy#%FaB  
  virtual BOOL InitInstance(); 4{=^J2z  
  virtual int ExitInstance(); b U>.Bp]  
  //}}AFX_VIRTUAL , *Z!Bd8  
  //{{AFX_MSG(CHookApp) <3b Ft[  
  // NOTE - the ClassWizard will add and remove member functions here. Y X{F$BM  
  // DO NOT EDIT what you see in these blocks of generated code ! =&?BPhJE  
  //}}AFX_MSG hQbz}x  
  DECLARE_MESSAGE_MAP() *h"7!g  
}; bX&=*L+ h6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); jL#`CD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Bjsg!^X7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \w@ "`!%  
BOOL InitHotkey(); (, uW-  
BOOL UnInit(); >o!~T}J7  
#endif J?bx<$C@  
CF@j]I@{   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8}!WJ2[R  
#include "stdafx.h" 'di(5  
#include "hook.h" Eg#WR&Uq"  
#include <windowsx.h> ksli-Px  
#ifdef _DEBUG e:RgCDWL  
#define new DEBUG_NEW XRWy#Pj  
#undef THIS_FILE agPTY{;  
static char THIS_FILE[] = __FILE__; 10e~Yc  
#endif 1ihdH1rg[  
#define MAX_KEY 100 [-JU(:Rh  
#define CTRLBIT 0x04 zM|Y X<  
#define ALTBIT 0x02 &\M<>>IB  
#define SHIFTBIT 0x01 ABnJ{$=n#  
#pragma data_seg("shareddata") _{YUWV50}  
HHOOK hHook =NULL; Vqxxm&^P  
UINT nHookCount =0; GUqBnRA8j  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey @L5s.]vg=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT V82N8-l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey h2m@Q={  
static int KeyCount =0; xIa8Ac  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z(a,$__  
#pragma data_seg() 3g5 n>8-  
HINSTANCE hins; /X97dF)zt  
void VerifyWindow(); 59M\uVWR  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) a}/ A]mu  
//{{AFX_MSG_MAP(CHookApp) 8{4jlL;"`?  
// NOTE - the ClassWizard will add and remove mapping macros here. }:hN}*H  
// DO NOT EDIT what you see in these blocks of generated code! /}$D&KwYg  
//}}AFX_MSG_MAP 7 y'2  
END_MESSAGE_MAP() aqN6.t  
J`d;I#R%c  
CHookApp::CHookApp() ._US8  
{ +I r  
 // TODO: add construction code here, C7 T}:V](q  
 // Place all significant initialization in InitInstance  F'9#dR?  
} L~>~a1p!  
@j=Q$k.GF  
CHookApp theApp; jS| 9jg:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) % *Lv  
{ k^*S3#"  
 BOOL bProcessed=FALSE; 3/ 0E9'  
 if(HC_ACTION==nCode) jLv8K  
 { 4S3uzy%  
  if((lParam&0xc0000000)==0xc0000000){// Key up )V?:qCuY>  
   switch(wParam) N)^` 15w  
   { {E$smX  
    case VK_MENU: 6k*,Yei  
     MaskBits&=~ALTBIT; Ni-@El99  
     break; g.T:72"  
    case VK_CONTROL: swLrp 74  
     MaskBits&=~CTRLBIT; 8XdgtYm  
     break; S!+}\*  
    case VK_SHIFT: eNX!EN(^  
     MaskBits&=~SHIFTBIT; x /E<@?*:  
     break; bE>"DP q  
    default: //judge the key and send message ?_nbaFQK3  
     break; -]k vM  
   } ;HoBLxb P  
   for(int index=0;index<MAX_KEY;index++){ .l$:0a  
    if(hCallWnd[index]==NULL) h0)Dj( C  
     continue; k}FmdaPI'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I::|d,bR!  
    { ]YWz;Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); H[D<G9:  
     bProcessed=TRUE; $u P'>  
    } 85Red~-M  
   } ,v$Q:n|  
  } r6gfxW5  
  else if((lParam&0xc000ffff)==1){ //Key down &ws^Dm]R  
   switch(wParam) fv/Nf"  
   { qvG@kuz8g5  
    case VK_MENU: xY>@GSO1  
     MaskBits|=ALTBIT; rc`}QoB)R  
     break; _UGR+0'Q\  
    case VK_CONTROL: z~(3S8$  
     MaskBits|=CTRLBIT; H?_>wQj&  
     break; z1S p'h$  
    case VK_SHIFT: 6&`hf >  
     MaskBits|=SHIFTBIT; H<Ik.]m  
     break; M)1Y7?r]  
    default: //judge the key and send message ~EtwX YkRZ  
     break;  x>$e*  
   } VMIX=gTZ  
   for(int index=0;index<MAX_KEY;index++) 7-#   
   { +FJ+,|i  
    if(hCallWnd[index]==NULL) R,dbq4xkl  
     continue; 9wbj}tN\z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) TQ5*z,CkS  
    { M`) /^S9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); a]nK!;>$  
     bProcessed=TRUE; 1Y'NG<d _  
    } H5>?{(m  
   } a&RH_LjM  
  } K*S3{s%UR  
  if(!bProcessed){ #g=  
   for(int index=0;index<MAX_KEY;index++){ /odDJxJ k  
    if(hCallWnd[index]==NULL) .bY R  
     continue; N>xdX5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) j9xu21'!%  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )k.}>0K |  
   } zd|n!3;  
  } 5y8VA4L/o  
 } %%FzBbWAO  
 return CallNextHookEx( hHook, nCode, wParam, lParam );  D9h  
} HT ."J  
Q@KCODi  
BOOL InitHotkey() 55Ya(E  
{ 7zq@T]  
 if(hHook!=NULL){ Z0%:j\W4c  
  nHookCount++; 4i7+'F  
  return TRUE; 49.B!DqQW&  
 } N@0cn q:"  
 else ny1;]_X_  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); rXP~k]tC  
  if(hHook!=NULL) _;M3=MTM9  
   nHookCount++; F:N8{puq5  
  return (hHook!=NULL); vb6kr?-i*  
} i&YWutG  
BOOL UnInit() l"-Z#[  
{ o$Ju\(Y$<+  
 if(nHookCount>1){ &-Ylj  
  nHookCount--; Z C<+BKS  
  return TRUE; -}3nIk<N  
 } Vh{(*p  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Z@(KZ|  
 if(unhooked==TRUE){ TJCE6QG  
  nHookCount=0; l];/,J^  
  hHook=NULL; 6n^@Ps  
 } RdBIbm  
 return unhooked; "+E\os72|  
} P; h8  
X ,{ 3_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +z 4E:v  
{ &`oybm-p(  
 BOOL bAdded=FALSE; TV=K3F5)M  
 for(int index=0;index<MAX_KEY;index++){ McpQ7\*h  
  if(hCallWnd[index]==0){ ocu,qL)W  
   hCallWnd[index]=hWnd; m?kyAW'|  
   HotKey[index]=cKey; Dxy^r*B  
   HotKeyMask[index]=cMask; t)1`^W}  
   bAdded=TRUE; 1yVhO2`7]  
   KeyCount++; v7 n@CWnN  
   break; ||?@pn\  
  } !Au#j^5K-o  
 } Q(36RX%@  
 return bAdded; V';l H2  
} F$bV}>-1k  
7[PEiAI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A=3L_ #nO  
{ :bm%f%gg  
 BOOL bRemoved=FALSE; vA}_x7}n(  
 for(int index=0;index<MAX_KEY;index++){ l0C`teO  
  if(hCallWnd[index]==hWnd){ u"4 B5D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Evd|_W-  
    hCallWnd[index]=NULL; cPv(VjS1;  
    HotKey[index]=0; bf|ePGW?  
    HotKeyMask[index]=0; 3~VV2O  
    bRemoved=TRUE; |c^?tR<  
    KeyCount--; 1je j7p>K  
    break; `nKN|6o#x  
   } ^=5x1<a9$  
  }  +IO>%  
 } H8B$# .  
 return bRemoved; z:4_f:70  
} { :1X N  
'ZB^=T  
void VerifyWindow() Qe{w)e0}`  
{ `XpQR=IOMb  
 for(int i=0;i<MAX_KEY;i++){ z$WLx  
  if(hCallWnd!=NULL){ X8">DR&>Y  
   if(!IsWindow(hCallWnd)){ u~aRFQ:  
    hCallWnd=NULL; Qz3Z_V4k9  
    HotKey=0; aL%E#  
    HotKeyMask=0; |R1T;J<[  
    KeyCount--; g/fpXO\  
   } k%FA:ms|k  
  } GX0zirz  
 } n}j6gN!O  
} 9! /kyyU  
a{.q/Tbt  
BOOL CHookApp::InitInstance() px "H  
{ P:t .Nr"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); a eeor  
 hins=AfxGetInstanceHandle(); MM_:2 ^P)  
 InitHotkey(); +D:8r|evH  
 return CWinApp::InitInstance(); -rn6ZSD)  
} 'It8h$^j  
@0 /qP<E  
int CHookApp::ExitInstance() e"52'zAV-  
{ ~7U~   
 VerifyWindow(); r4fHD~#l{  
 UnInit(); c(e>Rmh  
 return CWinApp::ExitInstance(); p |1u,N  
} h='F,r5#2  
t`&x.o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8lL|j  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tKeTHj;jO  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ q;")  
#if _MSC_VER > 1000 uINdeq7|F  
#pragma once hd u2?v@  
#endif // _MSC_VER > 1000 8M@'A5]  
[d8Q AO1;)  
class CCaptureDlg : public CDialog RGE(#   
{ {X&lgj  
 // Construction 80wzn,o S  
 public: &8z<~q  
  BOOL bTray; qQi\/~Y[:  
  BOOL bRegistered; 4] uj+J  
  BOOL RegisterHotkey(); eM:J_>7t  
  UCHAR cKey; Iz5NA0[=2  
  UCHAR cMask; _BmObXOp.  
  void DeleteIcon(); Ph1XI&us9  
  void AddIcon(); =i&,I{3  
  UINT nCount; 'Vo8|?.WhX  
  void SaveBmp(); S k~"-HL|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor CMaph  
  // Dialog Data 52dD(  
  //{{AFX_DATA(CCaptureDlg) ylKK!vRHT  
  enum { IDD = IDD_CAPTURE_DIALOG }; RHg-Cg`  
  CComboBox m_Key; . \"k49M`  
  BOOL m_bControl; 0{|HRiQH9+  
  BOOL m_bAlt; k=hWYe$iAz  
  BOOL m_bShift; 8~]D!c8;a  
  CString m_Path; odsFgh  
  CString m_Number; AQg|lKv  
  //}}AFX_DATA akxNT_   
  // ClassWizard generated virtual function overrides r8Mx +r  
  //{{AFX_VIRTUAL(CCaptureDlg) fq]PKLW'  
 public: RhH 1nf2UR  
  virtual BOOL PreTranslateMessage(MSG* pMsg); S@FO&o 0  
 protected: &~ y)b`r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |4Q*4s  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9)ALJd,M  
  //}}AFX_VIRTUAL La;G S  
  // Implementation Aw |;C  
 protected: }OL"38P  
  HICON m_hIcon; `t&{^ a&Y"  
  // Generated message map functions |)29"_Kk5  
  //{{AFX_MSG(CCaptureDlg) jC9us>b  
  virtual BOOL OnInitDialog(); yZ|"qP1  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .h7s.p?  
  afx_msg void OnPaint(); g[3LPKQ  
  afx_msg HCURSOR OnQueryDragIcon(); $'4 98%K2  
  virtual void OnCancel(); t'v t'[~,U  
  afx_msg void OnAbout(); 0jf6 z-4  
  afx_msg void OnBrowse(); \ ;npdFy  
  afx_msg void OnChange(); ,vJt!}}  
 //}}AFX_MSG HYmC3  
 DECLARE_MESSAGE_MAP() l%0bF9\  
}; " B#|C'   
#endif Yf w>x[#e  
?m |}}a  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mm-s?+&M;  
#include "stdafx.h" ZgP%sF  
#include "Capture.h"  uZS:  
#include "CaptureDlg.h" CJBf5I3  
#include <windowsx.h> -{cHp  
#pragma comment(lib,"hook.lib") 6Dlm. ~G  
#ifdef _DEBUG O?JJE8~']  
#define new DEBUG_NEW NXU:b"G S  
#undef THIS_FILE V&M*,#(?  
static char THIS_FILE[] = __FILE__; 3'0Pl8  
#endif _rT\?//B  
#define IDM_SHELL WM_USER+1 CubQ6@,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .$qa?$@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G<;~nAo?f0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ymk?@mV4  
class CAboutDlg : public CDialog Gt9$hB7  
{ 2 |s ohF  
 public: (^d7K:-'  
  CAboutDlg(); Je1d|1!3  
  // Dialog Data bbK};u  
  //{{AFX_DATA(CAboutDlg) / (&E  
  enum { IDD = IDD_ABOUTBOX }; C82_ )@96  
  //}}AFX_DATA ~~tTr $  
  // ClassWizard generated virtual function overrides ~[g(@Xt  
  //{{AFX_VIRTUAL(CAboutDlg) M&Ka ^h;N  
 protected: LVj 1NP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 94u{k1d x  
  //}}AFX_VIRTUAL .+9hm|  
  // Implementation *@2Bh4  
 protected: VY0.]t  
  //{{AFX_MSG(CAboutDlg) n~N>;m P  
  //}}AFX_MSG ]gk1q{Ql<  
  DECLARE_MESSAGE_MAP() Z*%;;&?  
}; m1"m KM  
8i#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Rh!UbEPjC  
{ 06&J!,p :  
 //{{AFX_DATA_INIT(CAboutDlg) :C~Ar]  
 //}}AFX_DATA_INIT Ot t6y  
} 5)k8(kH  
uN|A}/hr]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _R4}\3}!  
{ 9%!h/m>rW  
 CDialog::DoDataExchange(pDX); [ GLH8R  
 //{{AFX_DATA_MAP(CAboutDlg) BG>Y[u\N  
 //}}AFX_DATA_MAP "yn~axk7  
} x84!/n^z  
:xh{SsW@  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) u6qK4*eAD  
 //{{AFX_MSG_MAP(CAboutDlg) 3nq?Y8yac  
 // No message handlers +)Z]<O  
 //}}AFX_MSG_MAP fE#(M+(<  
END_MESSAGE_MAP() diq}\'f  
D'"  T'@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) BuJo W@)  
: CDialog(CCaptureDlg::IDD, pParent) NB-dlv1  
{ oxwbq=a6yV  
 //{{AFX_DATA_INIT(CCaptureDlg) [2%[~&4  
  m_bControl = FALSE; 1K72}Gj)ZL  
  m_bAlt = FALSE; @IT[-d  
  m_bShift = FALSE; j]Auun  
  m_Path = _T("c:\\"); o>el"0rn.h  
  m_Number = _T("0 picture captured."); DD| 0?i  
  nCount=0; ( ;FxKm<P@  
  bRegistered=FALSE; D JP6Z  
  bTray=FALSE; 2;}leZ@U  
 //}}AFX_DATA_INIT jkAjYR.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zTz}H*U  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `c`VIq?  
} Ma YU%h0  
`zd,^.i5~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) vCzZjGBY  
{ ]%\,.&=hT  
 CDialog::DoDataExchange(pDX); +>ju,;4WK  
 //{{AFX_DATA_MAP(CCaptureDlg) fqNh\~kja  
  DDX_Control(pDX, IDC_KEY, m_Key); [GwAm>k  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -9Q(3$}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); L kt4F  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &qv~)ZM$  
  DDX_Text(pDX, IDC_PATH, m_Path); Y0LZbT3  
  DDX_Text(pDX, IDC_NUMBER, m_Number); IkrB}  
 //}}AFX_DATA_MAP Y-VDi.]W  
} ]z'&oz  
=~D? K9o  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iSW2I~PD  
//{{AFX_MSG_MAP(CCaptureDlg) d t/AAk6  
 ON_WM_SYSCOMMAND() 0YH5B5b  
 ON_WM_PAINT() twT/uBQ4a  
 ON_WM_QUERYDRAGICON() -'rdN i  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) X+hHEkJ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Z%t_1t  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6FUW^dt  
//}}AFX_MSG_MAP YEL0h0gn  
END_MESSAGE_MAP() }LHYcNw^z  
^&zCPUH  
BOOL CCaptureDlg::OnInitDialog() =|t-0'RsN  
{ UhxM85M;x  
 CDialog::OnInitDialog(); MK&,2>m,A  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u[>"_!T  
 ASSERT(IDM_ABOUTBOX < 0xF000); *t@A-Sn  
 CMenu* pSysMenu = GetSystemMenu(FALSE); T(J'p4  
 if (pSysMenu != NULL) LGP"S5V  
 { VtBC~?2U)B  
  CString strAboutMenu; YIQD9  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yx-{Pj X   
  if (!strAboutMenu.IsEmpty()) b!<_ JOL2.  
  { s :vNr@TS  
   pSysMenu->AppendMenu(MF_SEPARATOR); qBA)5Sv\V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b--=GY))F  
  } ~Y 6'sM|  
 } O<u=Vz3c~0  
 SetIcon(m_hIcon, TRUE); // Set big icon L2}\Ah"[  
 SetIcon(m_hIcon, FALSE); // Set small icon /6x&%G:m#  
 m_Key.SetCurSel(0); 8 Rx@_   
 RegisterHotkey(); l|CM/(99-  
 CMenu* pMenu=GetSystemMenu(FALSE); _NDQ2O  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uP~,]ci7  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ^T=9j.e'ja  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); B8&q$QV  
 return TRUE; // return TRUE unless you set the focus to a control q_MN  
} \PrJy6&  
iw@rW5%'~  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) L9b.D<  
{ s~M4. 06P  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +^.Yt0}  
 { u mYsO.8  
  CAboutDlg dlgAbout; ]so/AdT9hA  
  dlgAbout.DoModal(); m`yvZ4K!  
 } >m%_`68  
 else y>o:5':;'  
 { ^y<^hKjV  
  CDialog::OnSysCommand(nID, lParam); E`HoJhB  
 } -hd  
} L.n@;*  
c_/BS n  
void CCaptureDlg::OnPaint() Y}~sTuWU  
{ -@v^. @[Z&  
 if (IsIconic()) Lg:1zC  
 { |G j.E  
  CPaintDC dc(this); // device context for painting tUu ' gs|  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2/-m-5A  
  // Center icon in client rectangle SN6 QX!3  
  int cxIcon = GetSystemMetrics(SM_CXICON); pPReo)  
  int cyIcon = GetSystemMetrics(SM_CYICON); $LP(\T([  
  CRect rect; &RR;'wLoQT  
  GetClientRect(&rect); $^x=i;>aK.  
  int x = (rect.Width() - cxIcon + 1) / 2;  f<o|5r  
  int y = (rect.Height() - cyIcon + 1) / 2; Z+xkN  
  // Draw the icon .k#PrT1C  
  dc.DrawIcon(x, y, m_hIcon); FZ*"^=)`G  
 } >d 5-if  
 else x{H+fq,M  
 { ]TvMT  
  CDialog::OnPaint(); ~WrpJjI[  
 } [R]V4Hb  
} Th_@'UDa  
{_7hX`p  
HCURSOR CCaptureDlg::OnQueryDragIcon() 2/SUEnaLy_  
{ <IrhR,@M,L  
 return (HCURSOR) m_hIcon; Q%CrB>|@  
} `zoHgn7B9q  
MN: {,#d0  
void CCaptureDlg::OnCancel() a1,)1y~  
{ \8(Je"S  
 if(bTray) {$S"S j  
  DeleteIcon(); lDS y$  
  CDialog::OnCancel(); PqspoH 0OI  
} 2)EqqX[D  
[I;C 6p  
void CCaptureDlg::OnAbout() D#nHg  
{ +9/K|SB{ $  
 CAboutDlg dlg; `;mgJD  
 dlg.DoModal(); R3g)LnN  
} @tT`s^e  
E8C8kH]  
void CCaptureDlg::OnBrowse() +149 o2  
{ >p&"X 2 @  
 CString str; 8kKL=  
 BROWSEINFO bi; m9h<)D'>  
 char name[MAX_PATH]; a>C;HO  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); SY95s  
 bi.hwndOwner=GetSafeHwnd(); [l=@b4Og  
 bi.pszDisplayName=name; 0 Rb3| te  
 bi.lpszTitle="Select folder"; u.E>d9  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?C CQm  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); X$xf@|<a  
 if(idl==NULL) "= 2\kZ  
  return; ts=D  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [XPAI["  
 str.ReleaseBuffer(); `*[Kmb\  
 m_Path=str; Mn5(Kw?o2J  
 if(str.GetAt(str.GetLength()-1)!='\\') ; &rxwL  
  m_Path+="\\"; +:Xg7H*  
 UpdateData(FALSE); "IS; o o$g  
} HFB>0<$  
e!=7VEB  
void CCaptureDlg::SaveBmp() aGW O3Nk  
{ /#5rt&q  
 CDC dc; Wrbv<8}%c  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); pPxgjX  
 CBitmap bm; ;\"5)S  
 int Width=GetSystemMetrics(SM_CXSCREEN); b73}|4v  
 int Height=GetSystemMetrics(SM_CYSCREEN); ^G qO>1U  
 bm.CreateCompatibleBitmap(&dc,Width,Height); eG+$~\%Fub  
 CDC tdc; S#CaJ}M  
 tdc.CreateCompatibleDC(&dc); =f@71D1  
 CBitmap*pOld=tdc.SelectObject(&bm); +%<kcc3  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *s, bz.[  
 tdc.SelectObject(pOld); .WeSU0XG  
 BITMAP btm; }2Ge??!  
 bm.GetBitmap(&btm); 7E* 0;sA#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ZT"vVX- )G  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); dm[JDVv|  
 BITMAPINFOHEADER bih; Ce//; Op  
 bih.biBitCount=btm.bmBitsPixel; QP"5A7=m  
 bih.biClrImportant=0; ^69(V LK  
 bih.biClrUsed=0; @WXRZEz  
 bih.biCompression=0; f*V^HfiQb  
 bih.biHeight=btm.bmHeight; 2./ z6jXW_  
 bih.biPlanes=1; x`2dN/wDhf  
 bih.biSize=sizeof(BITMAPINFOHEADER); s o: o b}  
 bih.biSizeImage=size; ao7M(f  
 bih.biWidth=btm.bmWidth; ZCK#=:ln  
 bih.biXPelsPerMeter=0; ; p+C0!B2  
 bih.biYPelsPerMeter=0; C(sz/x?11  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); JFu.o8[Q  
 static int filecount=0; )#Ecm<.^  
 CString name; !#1UTa  
 name.Format("pict%04d.bmp",filecount++); =C#z Px,  
 name=m_Path+name; * W"Pv,:  
 BITMAPFILEHEADER bfh; aA%x9\Y  
 bfh.bfReserved1=bfh.bfReserved2=0; ?y%Mm09  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 8u*Q^-fpo0  
 bfh.bfSize=54+size; $Q|6W &?[;  
 bfh.bfOffBits=54; TJcHqzcUc  
 CFile bf; }If,O  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ $/u.F;  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )+)qFGVz  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~urk Uz  
  bf.WriteHuge(lpData,size); ;Srzka2  
  bf.Close(); e*<pO@Uy  
  nCount++; YY>&R'3[  
 } 17:7w  
 GlobalFreePtr(lpData); ?r$& O*;  
 if(nCount==1) T_\hhP~  
  m_Number.Format("%d picture captured.",nCount); =%77~q-HL  
 else eHHU2^I,  
  m_Number.Format("%d pictures captured.",nCount); YYe<StyH  
  UpdateData(FALSE); AgDXpaq  
} !~mPxGY  
(e 2.Ru  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rXrIGgeM  
{ .dc|?$XV  
 if(pMsg -> message == WM_KEYDOWN) hZ>1n&[ @  
 { ju.`c->k"  
  if(pMsg -> wParam == VK_ESCAPE) x {R j2~KC  
   return TRUE; ? _[ q{i{  
  if(pMsg -> wParam == VK_RETURN) H_iQR9Ak7  
   return TRUE; ?U:c\TA,m  
 } @q|c|X:I  
 return CDialog::PreTranslateMessage(pMsg); 3!KyO)8  
} p%Ns f[1>  
wLq#,X>%B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >'3nsR  
{ x` 4|^ u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 4{$ L]toP  
  SaveBmp(); h-03]M#8=  
  return FALSE; pfMmDl5|  
} N]I::  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Vvn~G.&)  
 CMenu pop; <P5 7s+JK  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I0bkc3  
 CMenu*pMenu=pop.GetSubMenu(0); "v'%M({  
 pMenu->SetDefaultItem(ID_EXITICON); Z1\=d=  
 CPoint pt; < ?rdhx  
 GetCursorPos(&pt); *Xu?(Jd  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); -9 |)O:  
 if(id==ID_EXITICON) 4?`*# DPl  
  DeleteIcon(); @Y%i`}T%(  
 else if(id==ID_EXIT) p13y`sU=  
  OnCancel(); ^Y"|2 :  
 return FALSE; oPxh+|0?  
} I_`$$-|  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2N&S__  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q' t"  
 AddIcon(); @Bsvk9}  
 return res; J32"Ytdo<  
} RHI?_gf&  
y<ZT~e  
void CCaptureDlg::AddIcon() 4g+o/+6!4  
{ ad<ZdO*h  
 NOTIFYICONDATA data; <@c9S,@t  
 data.cbSize=sizeof(NOTIFYICONDATA); Jb!s#g  
 CString tip; @i>4k  
 tip.LoadString(IDS_ICONTIP); KpKZiUQm  
 data.hIcon=GetIcon(0); 1?y QjW,  
 data.hWnd=GetSafeHwnd(); AHplvksb  
 strcpy(data.szTip,tip); e1H2w? s  
 data.uCallbackMessage=IDM_SHELL;  _dVA^m  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 69Q#UJ  
 data.uID=98; aslb^  
 Shell_NotifyIcon(NIM_ADD,&data); ~kZ? e1H  
 ShowWindow(SW_HIDE); a^)@ }4  
 bTray=TRUE; ZGS4P0$  
} za5E{<0  
a;G>56iw  
void CCaptureDlg::DeleteIcon() 70A* !v  
{ /6'5uP   
 NOTIFYICONDATA data; )4FW~o<i  
 data.cbSize=sizeof(NOTIFYICONDATA); _lw:lZM?  
 data.hWnd=GetSafeHwnd(); wEix8Ow*  
 data.uID=98; P7 qzZ  
 Shell_NotifyIcon(NIM_DELETE,&data); XTq+  9  
 ShowWindow(SW_SHOW); Yx"~_xA/u  
 SetForegroundWindow(); J'yiVneMw  
 ShowWindow(SW_SHOWNORMAL); 4='/]z  
 bTray=FALSE; <xD6}h/  
} j2%M-y4E  
rVb61$  
void CCaptureDlg::OnChange() BKfoeN)%  
{ -pN'r/$3V  
 RegisterHotkey(); CuYSvW  
} zRA,Yi4;+  
tf{o=X.)  
BOOL CCaptureDlg::RegisterHotkey() ;/(<yu48  
{ )VkH':yCM  
 UpdateData(); bx3kd+J7  
 UCHAR mask=0; o+T, O+i  
 UCHAR key=0; g-2(W   
 if(m_bControl) x3=SMN|a  
  mask|=4; 7HQ|3rt  
 if(m_bAlt) 10..<v7  
  mask|=2; R5r CCp  
 if(m_bShift) l7S&s&W @  
  mask|=1; +{&++^(}a  
  key=Key_Table[m_Key.GetCurSel()]; I*= =I4qx  
 if(bRegistered){ hODq& 9!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); F t;[>o  
  bRegistered=FALSE; BA`K,#Ft7  
 } 2]_fNCNLN  
 cMask=mask; 6V @ [< d  
 cKey=key; d6g^>}-!t  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); oedLe9!  
 return bRegistered; e`t-:~'  
} KqWt4{\8v`  
w4;1 ('  
  四、小结 hR~~k~84  
-Z&9pI(3R~  
  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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