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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: V/}8+Xq  
  htym4\Z=  
  一、实现方法 xR`2+t&t  
jpv,0(  
  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: #K w\r50  
CHI(\DXNs  
#pragma data_seg("shareddata") <5~>.DuE  
HHOOK hHook =NULL; //钩子句柄 r^^C9"  
UINT nHookCount =0; //挂接的程序数目 !;Nh7vG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7*"LW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 'Sh5W%NM  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey We?:DM [  
static int KeyCount =0; 1tpD|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #sZes  
#pragma data_seg() oyw1N;K  
&[5az/Hj*  
  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。 ),,vu  
5-^twXC&  
  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: +KNr1rG  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j]&{ @Y  
cKey,UCHAR cMask) G].KJ5,y  
{ vrbh+  
 BOOL bAdded=FALSE; e*H$c?7NL  
 for(int index=0;index<MAX_KEY;index++){ }*.*{I  
  if(hCallWnd[index]==0){ _AYF'o-Cm  
   hCallWnd[index]=hWnd; >.\E'e5^C  
   HotKey[index]=cKey; PM7/fv*,  
   HotKeyMask[index]=cMask; 9To6Rc;  
   bAdded=TRUE; \/v$$1p2  
   KeyCount++; *Fws]y2t~  
   break; sKO ;p  
  } )zo ;r!eP  
 } I#U44+c  
 return bAdded; j83 V$ Le  
} Q>$L;1E*,  
//删除热键 ]EQ/*ct  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yk2j&}M  
{ 3(5Y-.aK}^  
 BOOL bRemoved=FALSE; 9<S-b |!@  
 for(int index=0;index<MAX_KEY;index++){ D9 en  
  if(hCallWnd[index]==hWnd){ mM.&c5U  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9G~P)Z!0  
    hCallWnd[index]=NULL; qE{S'XyM,  
    HotKey[index]=0; ]XU#i#;c  
    HotKeyMask[index]=0; 'zK*?= ^jk  
    bRemoved=TRUE; i;Y^}2   
    KeyCount--; 7i.aZ2a%  
    break; sSUd;BYf  
   } aDuanGC/V  
  } W(YJz#]6_  
 } "#jKk6{I0  
 return bRemoved; 7ZZt|bl  
} K#r` ^aUc  
-S @:  
=P{RHhWy;  
  DLL中的钩子函数如下: 's<}@-]  
cDg27xOUi  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 46~ug5gV  
{ r$5!KO  
 BOOL bProcessed=FALSE; YP l{5 =  
 if(HC_ACTION==nCode) x{$NstGB  
 { c&&UT-Z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 #Gx@\BE{  
   switch(wParam) &&O=v]6,V  
   {  2uVm?nm  
    case VK_MENU: 4a-wGx#h  
     MaskBits&=~ALTBIT; Ek3O{<  
     break; x5ia<V>=d  
    case VK_CONTROL: / yCV-L2J  
     MaskBits&=~CTRLBIT; 1zRO== b  
     break; M &J*I  
    case VK_SHIFT: }g?]B+0  
     MaskBits&=~SHIFTBIT; X6RM2  
     break; . {I7sUQ  
    default: //judge the key and send message nj mE>2  
     break; 7Y/_/t~Y  
   } \m&:J >^  
   for(int index=0;index<MAX_KEY;index++){ r DuG["  
    if(hCallWnd[index]==NULL) uypD`%pC  
     continue; ? t-2oLE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P6Ei!t,>  
    { x% 1Rp[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); M3%< kk-_  
     bProcessed=TRUE; V QI7lJV"  
    } ;G$FLL1   
   } yrw!b\  
  } fJuJ#MX{:  
  else if((lParam&0xc000ffff)==1){ //有键按下 JFfx9%Fq  
   switch(wParam) R<-KXT9  
   { &3<]FK  
    case VK_MENU: &!ZpBR(  
     MaskBits|=ALTBIT; M:x(_Lu  
     break; v;S JgZK  
    case VK_CONTROL: 8J} J;Ga  
     MaskBits|=CTRLBIT; 2 E^P=jU`  
     break; eo!z>9#.  
    case VK_SHIFT:  BeQJ/`  
     MaskBits|=SHIFTBIT; _),@^^&x  
     break; A Ho<E"R\  
    default: //judge the key and send message <$E8T>U  
     break; vJ!t.Vou  
   } R-ci?7dt3  
   for(int index=0;index<MAX_KEY;index++){ /-T%yuU  
    if(hCallWnd[index]==NULL) R##O9BSI8Z  
     continue; y03l_E,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HM/ q B^  
    { 7DD ot_qb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kDsUKO p  
     bProcessed=TRUE; #]rw@c  
    } i> ;G4  
   } 9 wc=B(a|  
  } %llG/]q#  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 l<5!R;?$  
   for(int index=0;index<MAX_KEY;index++){ j2+&B9 (  
    if(hCallWnd[index]==NULL) Z\x6  
     continue; 3jeR;N]x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5@Sb[za  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); J#\/znT  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~jgd92`{z  
   } ;Bm{_$hf=  
  } IcB>Hg5  
 } ,Fb#%r%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); R0Qp*&AL  
} 0/c4%+ Ln  
!|D,cs  
  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!(|y9p  
~34$D],D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QeGU]WU{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1z)+P1nH]  
{z w#My   
  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: gCmGFQE-f  
Y#\e~>K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) bbz86]AhY  
{ #C|iW@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) p?Y1^/   
 { Ab2VF;z :  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1!~9%=%  
  SaveBmp(); |nD`0Rbw  
  return FALSE; r_)*/  
 } }G]]0Oi2  
 …… //其它处理及默认处理 BP`UB  
} yY}`G-)g~*  
T6tJwSS4:  
bcQ$S;U)  
  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。 U9Sp$$L  
*Nv<,Br,F  
  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。 Xh ?{%?2  
T+I|2HYqOj  
  二、编程步骤 \!_ >ul  
MD%86m{Sg=  
  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"; NS\'o )J  
>d =k-d  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !+i  
nF=h|rN  
  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; co: W!  
E5B:79BGO  
  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.x3_+CX  
x,n;GR  
  5、 添加代码,编译运行程序。 8E D6C"6  
ss*dM.b  
三、程序代码 STO6cNi  
&TKB8vx=#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %#= 1?1s  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #fQStO  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8kk$:8  
#if _MSC_VER > 1000 ;#AV~Y- s  
#pragma once j &~OR6  
#endif // _MSC_VER > 1000 ;%Qu;FtC  
#ifndef __AFXWIN_H__ S^3I"B  
#error include 'stdafx.h' before including this file for PCH J5429Soo  
#endif dH8H<K~  
#include "resource.h" // main symbols 9T)-|fja_  
class CHookApp : public CWinApp C/)Xd^#  
{ .Ir5gz  
 public: =V(I  
  CHookApp(); gVO[R6C5C  
  // Overrides F;kNc:X`)  
  // ClassWizard generated virtual function overrides Y6+nfh_  
  //{{AFX_VIRTUAL(CHookApp) hS<+=3 <M  
 public: 8xLvpgcZ  
  virtual BOOL InitInstance(); -e30!A  
  virtual int ExitInstance(); tv5SQ+AI3  
  //}}AFX_VIRTUAL 0C7x1:  
  //{{AFX_MSG(CHookApp) G"wy?  
  // NOTE - the ClassWizard will add and remove member functions here. 8dP^zjPj  
  // DO NOT EDIT what you see in these blocks of generated code ! SwLul4V  
  //}}AFX_MSG /aP`|&G,)  
  DECLARE_MESSAGE_MAP() QD<f) JZK  
}; :hZYh.y\l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); op;OPf,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "Q ^Ck7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '(;`t1V8k  
BOOL InitHotkey(); rlgp1>89  
BOOL UnInit(); S_WYU&8  
#endif Mc9%s$MT  
c{z QX0  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. MC^H N w  
#include "stdafx.h" q'[5h>Pa  
#include "hook.h" 4&}LYSZl  
#include <windowsx.h> 2}K7(y!?u  
#ifdef _DEBUG 0X.pI1jCO  
#define new DEBUG_NEW UE5T%zd/  
#undef THIS_FILE S-*4HV_l  
static char THIS_FILE[] = __FILE__; tAefBFu  
#endif 6Z0@4_Y@B6  
#define MAX_KEY 100 ml\A)8O]j/  
#define CTRLBIT 0x04 + Uq$'2CT  
#define ALTBIT 0x02 3V2 "1Ic  
#define SHIFTBIT 0x01 ^As^hY^p  
#pragma data_seg("shareddata")  LGV"WE  
HHOOK hHook =NULL; VD,g  
UINT nHookCount =0; n)gzHch  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey k68\ _NUL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -b8Vz}Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >2TDYB|;  
static int KeyCount =0; ^ 14U]<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift o/ ozX4C  
#pragma data_seg() ,!Gw40t  
HINSTANCE hins; eNR>W>;'  
void VerifyWindow(); `;L>[\Xi  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ihdN{Mx<2  
//{{AFX_MSG_MAP(CHookApp) Y:XE4v/)@L  
// NOTE - the ClassWizard will add and remove mapping macros here. /0IvvD!7N  
// DO NOT EDIT what you see in these blocks of generated code! HTA Jn_  
//}}AFX_MSG_MAP e<#t]V  
END_MESSAGE_MAP() 9 "7(Jq  
)[i0~o[  
CHookApp::CHookApp() W$=Ad *  
{ W{<_gD9  
 // TODO: add construction code here, &]iiBp#2  
 // Place all significant initialization in InitInstance r3*0`Rup  
} -A^18r  
VyK[*k yN  
CHookApp theApp; j#rjYiYKy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /I(IT=kp  
{ a"@k11  
 BOOL bProcessed=FALSE; UiO%y  
 if(HC_ACTION==nCode) jhl9  
 { iv*`.9TK-  
  if((lParam&0xc0000000)==0xc0000000){// Key up ]c4?-Vq%u  
   switch(wParam) Dk[m)]w\  
   { 9!&fak _  
    case VK_MENU: Gm~jC <  
     MaskBits&=~ALTBIT; ErnjIx:  
     break; L )p*D(  
    case VK_CONTROL: kZ~0fw-  
     MaskBits&=~CTRLBIT; .SzP ig  
     break; ',$Uw|N  
    case VK_SHIFT: 5[suwaJQ  
     MaskBits&=~SHIFTBIT; L|A}A[P  
     break; M{w[hV  
    default: //judge the key and send message `lygJI?H+{  
     break; FxeDjAP  
   } e)"] H*  
   for(int index=0;index<MAX_KEY;index++){ Q8OA{EUtq  
    if(hCallWnd[index]==NULL) l];w,(u{  
     continue; :sDE 'o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9$U@h7|Q`  
    { Jr+~'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Er509zZ,[  
     bProcessed=TRUE; D+.< kY.  
    } &3~lZa;D  
   } CobMagPhr  
  } cAnL,?_v  
  else if((lParam&0xc000ffff)==1){ //Key down Q$u&/g3NvL  
   switch(wParam) qz[qjGdHg  
   { n@>h"(@i  
    case VK_MENU: B8_)I.  
     MaskBits|=ALTBIT; WZ,}]D  
     break; <?yf<G'$  
    case VK_CONTROL: dp;;20z  
     MaskBits|=CTRLBIT; IsP-[0it  
     break; Av6=q=D  
    case VK_SHIFT: HmlE Cx  
     MaskBits|=SHIFTBIT; ])Rs.Y{Q5  
     break; VAPRI\uM;  
    default: //judge the key and send message 5yBaxw`  
     break; ~0/tU#&  
   } jT/}5\  
   for(int index=0;index<MAX_KEY;index++) }(tuBJ9  
   { tjLp;%6e  
    if(hCallWnd[index]==NULL) \A "_|Yg  
     continue; vz$-KT4e^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YvA@I|..~  
    { ]:H((rk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l}w9c`f  
     bProcessed=TRUE; RgTm^?Ex  
    } o^ Z/~N  
   } Q5Yy \M  
  } !'m MGxkEb  
  if(!bProcessed){ [&H$Su}$0  
   for(int index=0;index<MAX_KEY;index++){ ^hL?.xj  
    if(hCallWnd[index]==NULL) Z8mSm[w  
     continue; DNTkv_S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) y-C=_v_X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $U . >]i  
   } 9rD6."G  
  } DPV>2' fV  
 } XL=Y~7b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 'DLgOUvh  
} 10.u  
I'sq0^  
BOOL InitHotkey() *49({TD6`  
{ {9mXJu$cc  
 if(hHook!=NULL){ V/N:Of:\R  
  nHookCount++; lSW6\jX  
  return TRUE; ={'*C7K)oK  
 } s0D,n1x  
 else 9c pjO  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R k'5L  
  if(hHook!=NULL)  F6'[8f  
   nHookCount++; WxE^S ??|  
  return (hHook!=NULL); VKGH+j[  
} HV0!G-h  
BOOL UnInit() A8|DB@ Bi  
{ X1wlOE  
 if(nHookCount>1){ r [NI#wW  
  nHookCount--; Ku 'OM6D<  
  return TRUE; I| V yv  
 } /kZ{+4M  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +F>9hA  
 if(unhooked==TRUE){ ^jph"a C  
  nHookCount=0; rHSA5.[1P  
  hHook=NULL; %1JN%  
 } @'5*u~M  
 return unhooked; gC/~@Z8W]  
} S2APqRg*  
TK! D=M  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uGo tXb  
{ C4,;l^?=%  
 BOOL bAdded=FALSE; 44r@8HO1  
 for(int index=0;index<MAX_KEY;index++){ JyiP3whW  
  if(hCallWnd[index]==0){ W'98ues%  
   hCallWnd[index]=hWnd; E\$7tXQK6  
   HotKey[index]=cKey; o x|K2A  
   HotKeyMask[index]=cMask; `S)*(s?T  
   bAdded=TRUE; sLHUQ(S!  
   KeyCount++; *- S/{ .&  
   break; !<EQVqj6  
  } pwIu;:O!?  
 } UgqfO(  
 return bAdded; QXaE2}}P  
} th :I31  
n7A %y2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {.r jp`39  
{ [c`u   
 BOOL bRemoved=FALSE; ?=^~(x?S  
 for(int index=0;index<MAX_KEY;index++){ %@q/OVnM  
  if(hCallWnd[index]==hWnd){ 31cC*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ F ]qX}  
    hCallWnd[index]=NULL; #&$a7L}  
    HotKey[index]=0; B8G9V6KS-  
    HotKeyMask[index]=0; \gU=B|W  
    bRemoved=TRUE; s3Wjg  
    KeyCount--; 0`H)c) pP  
    break; eV"Za.a.  
   } 03)R_A  
  } )NjxKSiU@  
 } FS+v YqwK  
 return bRemoved; ",O}{z  
} p?Rq  
5YG %\  
void VerifyWindow() U %,K8u|WH  
{ <jjn'*44f  
 for(int i=0;i<MAX_KEY;i++){ S&q(PI_"  
  if(hCallWnd!=NULL){ th4yuDPuA  
   if(!IsWindow(hCallWnd)){ ,ve$bSp  
    hCallWnd=NULL; s/+k[9l2  
    HotKey=0; [V2`t'  
    HotKeyMask=0; 8T]x4JQ0  
    KeyCount--; g~/@`Z2Y  
   } ,suC`)R  
  } [t{ed)J  
 } #"PRsMUw  
} =QG0:z)K<v  
cD5^mxd%  
BOOL CHookApp::InitInstance() HLruZyN4  
{ 9)~Ha iVB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); aP`[O]8j  
 hins=AfxGetInstanceHandle(); B |pdqSI  
 InitHotkey(); #q-7#pp  
 return CWinApp::InitInstance(); A}h`%b  
} _Pe,84Ro  
bMjE@S&  
int CHookApp::ExitInstance() ajJ+Jn\  
{ 5h!ZoB)n  
 VerifyWindow(); WF&?OHf2  
 UnInit(); n7$2 1*,  
 return CWinApp::ExitInstance(); No(p:Snbo  
} q33Z.3R  
$Y3mO ~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file #ouE, <  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Pkq?tm$#  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ }b$W+/M\  
#if _MSC_VER > 1000 nyRQ/.3  
#pragma once 2cu?2_,  
#endif // _MSC_VER > 1000 H}f} Y8J{  
kCVO!@yZz  
class CCaptureDlg : public CDialog N5%Cwl6i  
{ Z{p)rscX  
 // Construction vi8)U]6  
 public: F?jFFw im  
  BOOL bTray; QVq+';cG  
  BOOL bRegistered; /t $J<bU  
  BOOL RegisterHotkey(); ch-.+p3  
  UCHAR cKey; qVe&nXo  
  UCHAR cMask; MEled:i  
  void DeleteIcon(); o 00(\ -eb  
  void AddIcon(); 3{/Y&/\"'^  
  UINT nCount; 6 h%%?  
  void SaveBmp(); \[CPI`yQe  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor C\RJ){dk  
  // Dialog Data '0MH-M  
  //{{AFX_DATA(CCaptureDlg) WKDa]({k%  
  enum { IDD = IDD_CAPTURE_DIALOG }; i p"LoCE  
  CComboBox m_Key; yr"BeTrS.  
  BOOL m_bControl; Q[Xh{B  
  BOOL m_bAlt; _ !r]**  
  BOOL m_bShift; GyP.;$NHa[  
  CString m_Path; 7#G8qh<  
  CString m_Number; 8 mFy9{M  
  //}}AFX_DATA <,\Op=$l3I  
  // ClassWizard generated virtual function overrides NW AT"  
  //{{AFX_VIRTUAL(CCaptureDlg) L^b /+R#  
 public: 6!Z>^'6  
  virtual BOOL PreTranslateMessage(MSG* pMsg); KN\*|)  
 protected: #J_+ SL[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support L2$`S'UW  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); BnwYyh  
  //}}AFX_VIRTUAL or)v:4PXW  
  // Implementation ^v+3qm@,  
 protected: M&q3xo"w  
  HICON m_hIcon; W81 dLeTZg  
  // Generated message map functions R/BW$4/E  
  //{{AFX_MSG(CCaptureDlg) J.;{`U=:  
  virtual BOOL OnInitDialog(); xJemc3]2  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); O3];1ud  
  afx_msg void OnPaint(); 1Bl;.8he.)  
  afx_msg HCURSOR OnQueryDragIcon(); u}~jNV  
  virtual void OnCancel(); k&M9Hn2  
  afx_msg void OnAbout(); |9&bkojo  
  afx_msg void OnBrowse(); ]A%S&q  
  afx_msg void OnChange(); 'Io2",~ M  
 //}}AFX_MSG `COnb@uD  
 DECLARE_MESSAGE_MAP() ]@G$ L,3  
}; a*GiLq  
#endif )h>H}wDs  
)i$:iI >k  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file QswbIP/>:'  
#include "stdafx.h" Lo-\;%y  
#include "Capture.h" iFBH;O_~  
#include "CaptureDlg.h" /'<Qk'   
#include <windowsx.h> S9@2-Oc  
#pragma comment(lib,"hook.lib") 6vL+qOdx  
#ifdef _DEBUG CG397Y^  
#define new DEBUG_NEW <^v-y)%N:A  
#undef THIS_FILE Hp}dm93T  
static char THIS_FILE[] = __FILE__; NBaXfWh  
#endif Ak=|wY{  
#define IDM_SHELL WM_USER+1 G0^,@jF?b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2"IsNbWV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~V`F5B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; E2%{?o  
class CAboutDlg : public CDialog Uk0Fo(HY  
{ =E~)svl6g  
 public: .R! /?eN  
  CAboutDlg(); hY5tBL  
  // Dialog Data ,2*x4Gycb  
  //{{AFX_DATA(CAboutDlg) z!> H^v  
  enum { IDD = IDD_ABOUTBOX }; Z}NMDb:t  
  //}}AFX_DATA miv)R  
  // ClassWizard generated virtual function overrides  FKpyD  
  //{{AFX_VIRTUAL(CAboutDlg) vOnhJN  
 protected: *v6 j7<H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support r@v_hc  
  //}}AFX_VIRTUAL YI!@ ,t  
  // Implementation 9@{=2 k  
 protected: _4lhwKYU  
  //{{AFX_MSG(CAboutDlg) !%,k]m'  
  //}}AFX_MSG Fmo^ ?~b  
  DECLARE_MESSAGE_MAP() 9u%S<F"  
}; ^\Gukkmh}  
(w/)u  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :0o,pndU  
{ SGK=WLGM8  
 //{{AFX_DATA_INIT(CAboutDlg) sY*iRq  
 //}}AFX_DATA_INIT ]Ac&h aAP  
} -!JnyD   
\Ng|bWR>LQ  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3g''j7  
{ =, WW#tD  
 CDialog::DoDataExchange(pDX); _`LQnRp(  
 //{{AFX_DATA_MAP(CAboutDlg) tLc 9-  
 //}}AFX_DATA_MAP =xX)2h  
} blHJhB&8  
#OE]'k Ss  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #\LsM ~,  
 //{{AFX_MSG_MAP(CAboutDlg) rh+2 7"  
 // No message handlers L,PD4H"8  
 //}}AFX_MSG_MAP jJU9~5i?  
END_MESSAGE_MAP() l$mfsm|{:  
SIr^\iiOB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) B33H,e)  
: CDialog(CCaptureDlg::IDD, pParent) =Ti[Q5SZ  
{ @5Zg![G  
 //{{AFX_DATA_INIT(CCaptureDlg) n k@e#  
  m_bControl = FALSE; ZL{\M|@jz  
  m_bAlt = FALSE; ,- FC  
  m_bShift = FALSE; IN#Z(FMVC  
  m_Path = _T("c:\\"); X@cO`P  
  m_Number = _T("0 picture captured."); >|!s7.H/J/  
  nCount=0; .e|VW)  
  bRegistered=FALSE; J3P )oM[  
  bTray=FALSE; rM5{R}+;  
 //}}AFX_DATA_INIT 6B .x=  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 [fl x/E  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;wF 0s  
} Q xg)Wb#  
J~,Ny_L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *~H\#N|x  
{ 8IrA {UU  
 CDialog::DoDataExchange(pDX); b0n " J`  
 //{{AFX_DATA_MAP(CCaptureDlg) %M KZ':m  
  DDX_Control(pDX, IDC_KEY, m_Key); I%qZMoS1h  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Kp.d#W_TX  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 0'Y'K6hG`  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^;[|,:8f7L  
  DDX_Text(pDX, IDC_PATH, m_Path); H1^m>4ll9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); cQOc^W  
 //}}AFX_DATA_MAP {iRXK   
} ehe;<A  
Q q7+_,w  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) y^xEZD1X6-  
//{{AFX_MSG_MAP(CCaptureDlg) <1xs ya[e  
 ON_WM_SYSCOMMAND() u hJnDo  
 ON_WM_PAINT() ;{%R'  
 ON_WM_QUERYDRAGICON() ^_C]?D?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) IA&NMf;{  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0S}ogU[k  
 ON_BN_CLICKED(ID_CHANGE, OnChange) /rQ[Ik$|  
//}}AFX_MSG_MAP <{xU.zp'  
END_MESSAGE_MAP() zFpM\{`[g  
G:k]tZ*`  
BOOL CCaptureDlg::OnInitDialog() ugT;NB  
{ $ &III  
 CDialog::OnInitDialog(); 5S&'O4yz^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); D Xjw"^x  
 ASSERT(IDM_ABOUTBOX < 0xF000); ytkV"^1^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); dd&n>A3O=  
 if (pSysMenu != NULL) Rx,Qw> #  
 { Jq8CII  
  CString strAboutMenu; P g{/tM Y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); A.@/~\  
  if (!strAboutMenu.IsEmpty()) A\IQM^i  
  { EJ&aT etQ  
   pSysMenu->AppendMenu(MF_SEPARATOR); <!m'xOD  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); E]<Ce;Vj  
  } BZr$x8%ki  
 } Q(gc(bJV  
 SetIcon(m_hIcon, TRUE); // Set big icon k.MAX8  
 SetIcon(m_hIcon, FALSE); // Set small icon MfJ8+3@K  
 m_Key.SetCurSel(0); Nu]& ?  
 RegisterHotkey(); +&j&es  
 CMenu* pMenu=GetSystemMenu(FALSE); wEu"X  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ML9nfB^z!  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8:QnxrODP  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m5w ZS>@  
 return TRUE; // return TRUE unless you set the focus to a control EqB3f_  
} G{C27k>wa  
,k=1 '7d  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) hynX5,p;.  
{ dd=' ;%?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) G,]%dZH e  
 { WBIJ9e2~  
  CAboutDlg dlgAbout; p#fd+  
  dlgAbout.DoModal(); Kx[u9MD  
 } 93+p~?  
 else gs?=yNL  
 { G5K_e:i  
  CDialog::OnSysCommand(nID, lParam); _pM~v>~*+  
 } 3\~ RWoB0u  
} bU+ z(Eg6  
1_Ag:> #X  
void CCaptureDlg::OnPaint() Z6Kw'3  
{ E/[<} ./  
 if (IsIconic()) y;1 'hP&  
 { s'Op|`&X  
  CPaintDC dc(this); // device context for painting ]`S35b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7 g2@RKo  
  // Center icon in client rectangle tOQura  
  int cxIcon = GetSystemMetrics(SM_CXICON); |}YeQl  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2wKW17wj,  
  CRect rect; =Y;w O8  
  GetClientRect(&rect); &F xw19[G  
  int x = (rect.Width() - cxIcon + 1) / 2; 'c")]{  
  int y = (rect.Height() - cyIcon + 1) / 2; _ h7qS  
  // Draw the icon H7=[sL^  
  dc.DrawIcon(x, y, m_hIcon); 6gSo>F4=  
 } gr%!<2w  
 else 0 jszZ_  
 { \KpSYX1  
  CDialog::OnPaint(); Vu u2SS  
 } 6n}5>GSF  
} afJ`1l  
rEl bzL"&<  
HCURSOR CCaptureDlg::OnQueryDragIcon() @m bR I0  
{ 2:>|zmh_  
 return (HCURSOR) m_hIcon; xbeVq P  
} l[)ZEEP  
5qx,b&^w  
void CCaptureDlg::OnCancel() AnUOv 2  
{ ,*Vt53@E  
 if(bTray) Q:/BC= ~  
  DeleteIcon(); F N)vFQ#J  
  CDialog::OnCancel(); hj8S#  
} /!//i^  
7j <:hF~  
void CCaptureDlg::OnAbout() k'hJ@ 6eKS  
{ Gx.iZOOH/  
 CAboutDlg dlg; !VF.=\iH/  
 dlg.DoModal(); .S{Q }S  
} #UO#kC<2(B  
G{8>  
void CCaptureDlg::OnBrowse() ) C?emTih  
{ 4kZ9]5#.  
 CString str; X9lh@`3  
 BROWSEINFO bi; fT&>L  
 char name[MAX_PATH]; RkW)B^#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %#^)hX,+Q  
 bi.hwndOwner=GetSafeHwnd(); Z6Owxqfht  
 bi.pszDisplayName=name; K:i{us`  
 bi.lpszTitle="Select folder"; mROXwzL  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?uq7K"B  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $xWebz0  
 if(idl==NULL) jw^Pt~@  
  return; -wqnmK+G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); m3La;%aA0  
 str.ReleaseBuffer(); T==(Pw7R7  
 m_Path=str; 5,pKv  
 if(str.GetAt(str.GetLength()-1)!='\\') :Ur=}@Dj  
  m_Path+="\\"; ]nEZ Q+F  
 UpdateData(FALSE); ?\eq!bu  
} v@8 =u4  
n<. T6  
void CCaptureDlg::SaveBmp() quvdm68  
{ hkh b8zS  
 CDC dc; JMnk~8O  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &vy/Vd  
 CBitmap bm; ) Apg  
 int Width=GetSystemMetrics(SM_CXSCREEN); yLo{^4a.  
 int Height=GetSystemMetrics(SM_CYSCREEN); ##6_kcL:6G  
 bm.CreateCompatibleBitmap(&dc,Width,Height); R-8/BTls7  
 CDC tdc; le*1L8n$'  
 tdc.CreateCompatibleDC(&dc); s /? &H-  
 CBitmap*pOld=tdc.SelectObject(&bm); cP4K9:k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); k>N >_{\  
 tdc.SelectObject(pOld); Pd,+= ML  
 BITMAP btm; eTV%+  
 bm.GetBitmap(&btm); Mk*&CNo3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Zv`j+b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +&w=*IAKZ  
 BITMAPINFOHEADER bih; q $Hg\ {c  
 bih.biBitCount=btm.bmBitsPixel; XuQ7nlbnq  
 bih.biClrImportant=0; fCA/   
 bih.biClrUsed=0; *=-o0c  
 bih.biCompression=0; gD[Fkq$]  
 bih.biHeight=btm.bmHeight; }P5zf$  
 bih.biPlanes=1; _>G=v!  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0NN{2"M$p  
 bih.biSizeImage=size; l>Nz]Ul%{  
 bih.biWidth=btm.bmWidth; ON(H7  
 bih.biXPelsPerMeter=0; GYx_9"J\5  
 bih.biYPelsPerMeter=0; 7*7Z&1*3  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1-Fz#v7p  
 static int filecount=0; rt7Ma2tK  
 CString name; 2 us-s  
 name.Format("pict%04d.bmp",filecount++); &*I\~;1  
 name=m_Path+name; suh@  
 BITMAPFILEHEADER bfh; n.[0#Ur&}  
 bfh.bfReserved1=bfh.bfReserved2=0; <eObQ[mQ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); j4au Zl]NF  
 bfh.bfSize=54+size; !Cm<K*c"&E  
 bfh.bfOffBits=54; %'}L.OvG  
 CFile bf; x,s Ma*vd  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ a:PS}_.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); kp4*|$]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Jl"),;Od  
  bf.WriteHuge(lpData,size); blwdcdh  
  bf.Close(); o8:K6y  
  nCount++; e7{n=M  
 } h\ (z!7t*  
 GlobalFreePtr(lpData); #xqeCX 4p  
 if(nCount==1) 6\MJvg\;  
  m_Number.Format("%d picture captured.",nCount); }),tk?\  
 else AxaabS$\  
  m_Number.Format("%d pictures captured.",nCount); Pez 7HKW:  
  UpdateData(FALSE); Xwg|fr+p  
} FkdG@7Xf  
@quNVx(y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 58H[sM4>  
{ (c /H$'  
 if(pMsg -> message == WM_KEYDOWN) nt,tM/  
 { idwiM|.iU  
  if(pMsg -> wParam == VK_ESCAPE) Xd_86q8o  
   return TRUE; VrF(0,-Z`3  
  if(pMsg -> wParam == VK_RETURN) avR4#bfc  
   return TRUE; sOSol7n  
 } x?J- {6k  
 return CDialog::PreTranslateMessage(pMsg); 't$(Ruw  
} IT,TSs/Y  
/t-m/&>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +$MNG   
{ H61 ,pr>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ <a-I-~  
  SaveBmp(); or_x0Q  
  return FALSE; 1cE3uA7  
} pV#~$e  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?_e2)+q8YG  
 CMenu pop; Y[AL!h  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 7$(>Z^ Em  
 CMenu*pMenu=pop.GetSubMenu(0); (C#9/WO?  
 pMenu->SetDefaultItem(ID_EXITICON); ~jab/cR  
 CPoint pt; _y}]j;e8>{  
 GetCursorPos(&pt); Azx4+`!-  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); q$EicH}k8  
 if(id==ID_EXITICON) vUGEzCM  
  DeleteIcon(); N[ %^0T$  
 else if(id==ID_EXIT) (F$V m  
  OnCancel(); l`L}*Q- 5  
 return FALSE; ]8(_{@ /  
} *rO#UE2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); UV%A l)3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) r;`6ML[5Vx  
 AddIcon(); ; d1\2H  
 return res; D6,rb 9  
} 4@PH5z  
bk E4{P"  
void CCaptureDlg::AddIcon() }2Y:#{m  
{  {g?$u  
 NOTIFYICONDATA data; _B` '1tNx  
 data.cbSize=sizeof(NOTIFYICONDATA);   5;+OpB  
 CString tip; B\a-Q,Wf  
 tip.LoadString(IDS_ICONTIP); 4,m aA  
 data.hIcon=GetIcon(0); <4z |"(  
 data.hWnd=GetSafeHwnd(); B$aA=+<S  
 strcpy(data.szTip,tip); :E/]Bjq$;  
 data.uCallbackMessage=IDM_SHELL; {n8mE,;M  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3^l@!Qw  
 data.uID=98; +K4d(!Sb  
 Shell_NotifyIcon(NIM_ADD,&data); *%L:soM'Ll  
 ShowWindow(SW_HIDE); `7qZ6Z3z@  
 bTray=TRUE; kP9DCDO`[5  
} .P\wE";  
dxkq*  
void CCaptureDlg::DeleteIcon() j nvi_Rodm  
{ YC#N],#  
 NOTIFYICONDATA data; SMVn2H@  
 data.cbSize=sizeof(NOTIFYICONDATA); fu3/n@L  
 data.hWnd=GetSafeHwnd(); w-?_U7'  
 data.uID=98; dzMlfJp  
 Shell_NotifyIcon(NIM_DELETE,&data);  4l+"J:,  
 ShowWindow(SW_SHOW); `_C4L=q"  
 SetForegroundWindow(); 5v4 ,YHD  
 ShowWindow(SW_SHOWNORMAL); 4 2aYM!  
 bTray=FALSE; K_ P08  
} T]\_[e:'  
K1Ms  
void CCaptureDlg::OnChange() Xc;W9e(U  
{ OosxuAC(  
 RegisterHotkey(); mG2*s ^$  
} 1.YDIB||  
VfOm#Ue0 q  
BOOL CCaptureDlg::RegisterHotkey() E(Tvj\9  
{ + ^n [B  
 UpdateData(); ~=~|@K  
 UCHAR mask=0; Sw<@u+Z;%  
 UCHAR key=0; ftB-gItV  
 if(m_bControl) gT$`a  
  mask|=4; mGZ^K,)&OR  
 if(m_bAlt) ZI4[v>  
  mask|=2; E7-il;`cKn  
 if(m_bShift) g$<Sh.4A  
  mask|=1; Md_S};!QN6  
  key=Key_Table[m_Key.GetCurSel()]; v'(p."g  
 if(bRegistered){ n>?o=_|uR  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); I!?-lI@(  
  bRegistered=FALSE; UU')V  
 } 5Jd(&k8%  
 cMask=mask; To1 .U)do  
 cKey=key; hnag <=  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); LIYj__4=|  
 return bRegistered; r9<OB`)3+  
} rf_(pp)  
fB+4mEG@  
  四、小结 $8gj}0}eH  
x5_V5A/@LU  
  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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