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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: bf1$:09  
  CKFr9bT{  
  一、实现方法 ^qBm%R(  
@cxM#N8e  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ,\3Cq2h  
Z[Iej:o5  
#pragma data_seg("shareddata") HfP<hQmN'  
HHOOK hHook =NULL; //钩子句柄 l?m 3 *  
UINT nHookCount =0; //挂接的程序数目 r oG<2i F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 b5jD /X4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 | a i#rU  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey XH*(zTd(?  
static int KeyCount =0; mRyf+O[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +jq@!P"}d  
#pragma data_seg() =^*EM<WG)  
%yKcp5_  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 vmOye/?k  
0;=]MEk?  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 47*2QL^zj  
E#tfCM6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR &6Lh>n(  
cKey,UCHAR cMask) ^b$G.h{o!E  
{ ouoIbA9X  
 BOOL bAdded=FALSE; A(BjU:D(Oj  
 for(int index=0;index<MAX_KEY;index++){ ?aBAmyxm  
  if(hCallWnd[index]==0){ A~k: m0MX  
   hCallWnd[index]=hWnd; 7TypzgXNe  
   HotKey[index]=cKey; )w&|VvM )L  
   HotKeyMask[index]=cMask; ^e =xEZD  
   bAdded=TRUE; }z\t}lven  
   KeyCount++; ' Gx\  
   break; glM42s  
  } S ;8=+I,  
 } 2Z<S^9O9  
 return bAdded; G\k&s F  
} KMfRMc&  
//删除热键 Td7Q%7p:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;"9Ks.  
{ 'h~IbP  
 BOOL bRemoved=FALSE; l9+CJAmq  
 for(int index=0;index<MAX_KEY;index++){  >}]bKq  
  if(hCallWnd[index]==hWnd){ U Lq`!1{   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QJR},nZ3  
    hCallWnd[index]=NULL; VB8eGMo  
    HotKey[index]=0; &\6(iL  
    HotKeyMask[index]=0; GuL0:,  
    bRemoved=TRUE; QL2 LIs  
    KeyCount--; eDNY|}$}v  
    break; HJ"sK5Q  
   } > 9z-/e  
  } vKdS1Dn1  
 } D0S^Msk9L  
 return bRemoved; ~WV1t][  
} :AuKQ`c  
P&Xy6@%[Z  
DSp~k)  
  DLL中的钩子函数如下: j 7O!uUQQ  
ff fWvf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9M|#X1r{%{  
{ -{d(~XIo  
 BOOL bProcessed=FALSE; f1o^:}5x  
 if(HC_ACTION==nCode) 94*MRn1E  
 { ) 54cG  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 _x!/40^G  
   switch(wParam) /Q#eP m  
   {  l 8GAZ*+  
    case VK_MENU: KiC,O7&<  
     MaskBits&=~ALTBIT; c1*^ \   
     break; @&Yl'&pn-R  
    case VK_CONTROL: !>K=@9NC|.  
     MaskBits&=~CTRLBIT; v6x jLP;O  
     break; 33hP/p%  
    case VK_SHIFT: PIQd=%?'  
     MaskBits&=~SHIFTBIT; qla=LS\-A+  
     break; `r\/5|M  
    default: //judge the key and send message +8|Xj!!*}  
     break; d=\\ik8  
   } ,~l4-x.,  
   for(int index=0;index<MAX_KEY;index++){ l}g_<  
    if(hCallWnd[index]==NULL) duCXCX^n T  
     continue; }J\7IsM&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C^U>{jf !  
    { gMZrtK`<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >k/ rJ[Sc  
     bProcessed=TRUE; !|ic{1!_  
    } 5Go@1X]I  
   } wb]Z4/j#  
  } -&v0JvTJ9j  
  else if((lParam&0xc000ffff)==1){ //有键按下 r>"l:GZ  
   switch(wParam) $3970ni,?O  
   { ;\/ RgN  
    case VK_MENU: d1*0?GTT  
     MaskBits|=ALTBIT; 4}YHg&@\d%  
     break; O=!EqaExW  
    case VK_CONTROL: +tYskx/  
     MaskBits|=CTRLBIT; "oR%0pU*  
     break; YsTF10  
    case VK_SHIFT: Ac +fL  
     MaskBits|=SHIFTBIT; 4!'4 l=jO  
     break; kO/;lrwC  
    default: //judge the key and send message '^2bC  
     break; "Vwk&~B%  
   } $B%3#-  
   for(int index=0;index<MAX_KEY;index++){ AX )dZdd  
    if(hCallWnd[index]==NULL) /KO2y0`  
     continue; ?i~mt'O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6gq`V,  
    { nK]L0*s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); N{!@M_C^%R  
     bProcessed=TRUE;  10_@'N  
    } Nlm3RxSn  
   } }:b) =fs  
  } c&SSf_0O*  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Y#U0g|UDn  
   for(int index=0;index<MAX_KEY;index++){ g9=O<u#  
    if(hCallWnd[index]==NULL) #'y^@90R  
     continue; 86Xf6Ea  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) T(+*y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f2Tz5slE  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 79'N/:.  
   } dW|S\S'&  
  } dJ{'b '#  
 } <Lq.J`|+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3J^'x  
} jrYA5>=>#  
0IbR>zFg.  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: oi^pU  
U,~Z2L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sbFA{l3   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nh"LdHqiDB  
%#lJn.o  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: F @Wb<+0  
il:RE8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vH?3UW  
{ CX>QP&Gj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) <gY.2#6C\%  
 { dJmr!bN\;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z&J.8A]L  
  SaveBmp(); 8d>>r69$pa  
  return FALSE; FWpb5jc)3  
 } P# Z+:T  
 …… //其它处理及默认处理 +[=%W  
} KMV&c  
j"P}Wn  
4Mj cx.21  
  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。 -[5yp 2F-{  
g; ZVoD  
  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。 7{u1ynt   
xJE26i  
  二、编程步骤 ~5_>$7L>  
/p[lOg  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Sh o] ~)XX  
:x_;-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4VlQN$  
zT _[pa)O`  
  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; 77zDHq=  
)Yw m_f-N  
  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; X>s'_F?  
! d" i  
  5、 添加代码,编译运行程序。 8$6^S{M3  
Cn8w}) B  
三、程序代码 7E)*]7B%  
{ daEKac5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL <0^L L  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ':?MFkYC  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =:7OS>x  
#if _MSC_VER > 1000 7D)i]68E  
#pragma once EN@Pr `R  
#endif // _MSC_VER > 1000 Kd^,NAg  
#ifndef __AFXWIN_H__ P }$DCD<$U  
#error include 'stdafx.h' before including this file for PCH ZklZU,\!|v  
#endif %0^taA  
#include "resource.h" // main symbols FTZaN1%`  
class CHookApp : public CWinApp oxgh;v*  
{ UhF+},gU  
 public: sT%^W  
  CHookApp(); oi/bp#(fa  
  // Overrides ^-pHhh|g  
  // ClassWizard generated virtual function overrides "_36WX  
  //{{AFX_VIRTUAL(CHookApp) =jW= Z$3q  
 public: Bis'59?U_  
  virtual BOOL InitInstance(); `]l*H3+hg  
  virtual int ExitInstance(); pe7R1{2Q_s  
  //}}AFX_VIRTUAL DM)%=C6<  
  //{{AFX_MSG(CHookApp) RS1c+]rr  
  // NOTE - the ClassWizard will add and remove member functions here. s*.&DN  
  // DO NOT EDIT what you see in these blocks of generated code ! $tFmp)  
  //}}AFX_MSG c/ABBvd|  
  DECLARE_MESSAGE_MAP() !$^LTBOH3  
}; m}>#s3KPA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); zD}2Zh]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D= LLm$y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [(4s\c  
BOOL InitHotkey(); '6W|,  
BOOL UnInit(); '"<h;|  
#endif ~OQ/ |ws  
vB T]a  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QGQ}I  
#include "stdafx.h" ;chz};zY  
#include "hook.h" k_%"#  
#include <windowsx.h> 0 P-eC|0  
#ifdef _DEBUG  C%\.  
#define new DEBUG_NEW 0!!z'm3  
#undef THIS_FILE v d}Y$X  
static char THIS_FILE[] = __FILE__; (}NKW  
#endif r1QLSD]i6  
#define MAX_KEY 100 8 ,<F102(  
#define CTRLBIT 0x04 ;Jq 7E  
#define ALTBIT 0x02 xHY#"   
#define SHIFTBIT 0x01 1 n<7YO7}  
#pragma data_seg("shareddata") Y)]x1I  
HHOOK hHook =NULL; HOrD20  
UINT nHookCount =0; nq"U`z@R  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0h",.  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;wvhe;!  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d~-C r-s4  
static int KeyCount =0; W|aFEY  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift q_ |YLs`  
#pragma data_seg() 5 U{}A\q  
HINSTANCE hins; WTP~MJ#C  
void VerifyWindow(); Rr/sxR|0_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Fj~,>   
//{{AFX_MSG_MAP(CHookApp)  W .t`  
// NOTE - the ClassWizard will add and remove mapping macros here. V:vYS  
// DO NOT EDIT what you see in these blocks of generated code! UL   
//}}AFX_MSG_MAP z&r@c-l@  
END_MESSAGE_MAP() ?* %J Gz_  
Gh#$[5&`  
CHookApp::CHookApp() n_X)6 s  
{ ?$&iVN^UA  
 // TODO: add construction code here, iO_6>&(  
 // Place all significant initialization in InitInstance pN ^^U[  
} pAd 8-a  
Xitsb f=Gg  
CHookApp theApp; M@b:~mI[sw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gnPu{-Ec*  
{ _9Zwg+oO[  
 BOOL bProcessed=FALSE; eURj'8o),  
 if(HC_ACTION==nCode) :_y}8am;H~  
 { C VyE5w  
  if((lParam&0xc0000000)==0xc0000000){// Key up vw/L|b7G  
   switch(wParam) > R5<D'cEN  
   { tEXY>=  
    case VK_MENU: Ckc4U. t|  
     MaskBits&=~ALTBIT; FV->226o%  
     break; #nOS7Q#uW  
    case VK_CONTROL: SZ[ ,(h  
     MaskBits&=~CTRLBIT; Fs,#d%4@%  
     break; ?UGA-^E1  
    case VK_SHIFT: ^YLk&A)X  
     MaskBits&=~SHIFTBIT; VS{po:]A  
     break; +jPs0?}s  
    default: //judge the key and send message [9S?  
     break; R;68C6 4  
   }  aX'R&R  
   for(int index=0;index<MAX_KEY;index++){ w`")^KXi  
    if(hCallWnd[index]==NULL) 4.}{B_)LK  
     continue; @d]a#ypU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 97%S{_2m/  
    { L6-zQztn  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^t'mfG|DV  
     bProcessed=TRUE; :t36]NM  
    } PfRe)JuB  
   } U)n+j}vi  
  } O*8 .kqlgt  
  else if((lParam&0xc000ffff)==1){ //Key down S?k G|y  
   switch(wParam) C;C= g1I}  
   { L93&.d@m9  
    case VK_MENU: muc>4!Q  
     MaskBits|=ALTBIT; 6pHn%yE*  
     break; ~RRp5x _  
    case VK_CONTROL: g]hTz)8fF  
     MaskBits|=CTRLBIT; Xj^Hy"HC^~  
     break; vCB0 x:/  
    case VK_SHIFT: Y%B:IeF}  
     MaskBits|=SHIFTBIT; n7r )wy  
     break; bvK fxAih  
    default: //judge the key and send message d 1 8>0R  
     break; };z[x2l^  
   } &u@<0 1=  
   for(int index=0;index<MAX_KEY;index++) o'8`>rb  
   { TNHkHR[&  
    if(hCallWnd[index]==NULL) #:y h2y7a%  
     continue; X?'v FC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wInJ!1  
    { ,a&&y0,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,'E+f%  
     bProcessed=TRUE; #H;yXsR `  
    } m1mA:R\zM  
   } #BK3CD(&  
  } 7vRFF@eq}  
  if(!bProcessed){ t3dvHU&Z:  
   for(int index=0;index<MAX_KEY;index++){ ve [*t`  
    if(hCallWnd[index]==NULL) GRt1]%l#$  
     continue; <]jKpJ{3N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #@*;Y(9Ol  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); X \1grM  
   } w[bhm$SX]B  
  } c%N8|!e  
 } P}AfXgr  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -f+U:/'.>v  
} ,'KQFC   
<u 'q._m  
BOOL InitHotkey() Y2)2 tzr]  
{ U49#?^?  
 if(hHook!=NULL){ Y] ZNAR  
  nHookCount++; Vl0 J!JK_  
  return TRUE; ac-R q.GQY  
 }  m,,FNYW  
 else YhVV~bvz*  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); <)vjoRv  
  if(hHook!=NULL) ]%RX\~Q.4  
   nHookCount++; 'D B4po.   
  return (hHook!=NULL); P2q'P&  
} `pHlGbrW  
BOOL UnInit() nMniHB'  
{ uEK9  
 if(nHookCount>1){ eq|G\XJ  
  nHookCount--; \sUk71L` j  
  return TRUE; u;[*Z  
 } Y'75DE<BC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); x2^Yvgc-  
 if(unhooked==TRUE){ Guc~] B  
  nHookCount=0; 3( Y#*f|  
  hHook=NULL; 80p?qe  
 } C1/<t)^  
 return unhooked; y}'c)u  
} A 11w{`EM  
&s +DK `  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !zd]6YL$  
{ {iyO96YI[^  
 BOOL bAdded=FALSE; M=mzl750M  
 for(int index=0;index<MAX_KEY;index++){ &m>yY{ be  
  if(hCallWnd[index]==0){ TTJFF\$?  
   hCallWnd[index]=hWnd; F)W7,^=X>-  
   HotKey[index]=cKey; VUo7Evc:.P  
   HotKeyMask[index]=cMask; _o 2pyV&  
   bAdded=TRUE; kiW|h)w_,v  
   KeyCount++; ]/o0p  
   break; MQ9Nn|4  
  } t3~ZGOn  
 } bD&^-& G  
 return bAdded; Qj?qWVapA  
} -FAAP&LG  
Auq)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C&&*6E5  
{ "kE$2Kg  
 BOOL bRemoved=FALSE; 3Ishe"  
 for(int index=0;index<MAX_KEY;index++){ 7 +RsZu  
  if(hCallWnd[index]==hWnd){ -|?I'~[#(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4oY<O  
    hCallWnd[index]=NULL; #s'UA!)  
    HotKey[index]=0; 36NENzK  
    HotKeyMask[index]=0; Q: H`TSR]  
    bRemoved=TRUE; bJ[{[|yEd  
    KeyCount--; /~,|zz  
    break; 8y<NT"  
   } 0>  
  } \m>mE/N  
 } QbF!V%+a's  
 return bRemoved; SMMV$;O{9  
} DNP %]{J  
|C\%H R  
void VerifyWindow() zyznFiE  
{ zL1*w@6  
 for(int i=0;i<MAX_KEY;i++){ y+ZRh?2  
  if(hCallWnd!=NULL){ <Ae1YHUY  
   if(!IsWindow(hCallWnd)){ :'L^zGf  
    hCallWnd=NULL; j^t#>tZS  
    HotKey=0; F__(iXxC  
    HotKeyMask=0; 9]ga\>v  
    KeyCount--; (8[etm  
   } ;*3OkNxa3  
  } l5> H\  
 } JGJXV3AT  
} =F(fum;zH  
qjK'sge/  
BOOL CHookApp::InitInstance() eV?._-G  
{ i2a""zac  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); D{Zjo)&tF'  
 hins=AfxGetInstanceHandle(); {,Y?+F  
 InitHotkey(); 2:31J4t-<  
 return CWinApp::InitInstance(); ]kJinXHW  
} sH//*y  
&rTOJ 1)V}  
int CHookApp::ExitInstance() U]Iypl`l  
{ 0 i76(2  
 VerifyWindow(); 7J 0=HbH  
 UnInit(); @Axwj   
 return CWinApp::ExitInstance(); i.eu$~F  
} U_/sY9gz(  
7^{M:kYC!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $6W o$c%  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o%!8t_1mR  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ :# 1d;jx  
#if _MSC_VER > 1000 (*.t~6c?5  
#pragma once l?F&I.{J  
#endif // _MSC_VER > 1000 xQ4'$rL1d  
^)r^k8y'  
class CCaptureDlg : public CDialog On[:]#  
{ ~Rs_ep'+Q2  
 // Construction rf2+~B{$,  
 public: y7K&@ Y  
  BOOL bTray; hAPWEh^  
  BOOL bRegistered; 6x1 !!X+)+  
  BOOL RegisterHotkey(); .qjVw?E  
  UCHAR cKey; s 0}OsHAj  
  UCHAR cMask; Ca: jN0  
  void DeleteIcon(); F %OA  
  void AddIcon(); D1&%N{  
  UINT nCount; P'.M.I@  
  void SaveBmp(); bB|UQaCl  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c:  /Wk  
  // Dialog Data `$IuN *  
  //{{AFX_DATA(CCaptureDlg) `m6>r9:  
  enum { IDD = IDD_CAPTURE_DIALOG }; ZRDY `eK  
  CComboBox m_Key; 0KW@j>=jK  
  BOOL m_bControl; zJp}JO  
  BOOL m_bAlt; 0]x gE  
  BOOL m_bShift; 2OXcP!\Y  
  CString m_Path; @a AR99M  
  CString m_Number; 'A0.(a5  
  //}}AFX_DATA 41c]o<!=)j  
  // ClassWizard generated virtual function overrides vqq7IV)|  
  //{{AFX_VIRTUAL(CCaptureDlg) [dm&I#m=  
 public: <kQ 5sG  
  virtual BOOL PreTranslateMessage(MSG* pMsg); rJ LlDKP-(  
 protected: }GIwYh/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support UL81x72O  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); JArSJ:}  
  //}}AFX_VIRTUAL Dg^n`[WO  
  // Implementation s>=DfE-;"  
 protected: _j$"fg  
  HICON m_hIcon; 9H@I<`qGC  
  // Generated message map functions R3nCk-Dq  
  //{{AFX_MSG(CCaptureDlg) ^/|agQ7D2  
  virtual BOOL OnInitDialog(); P8tpbdZE-  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); l+6y$2QR  
  afx_msg void OnPaint(); }T@^wY_Ow  
  afx_msg HCURSOR OnQueryDragIcon(); J%G EIe|  
  virtual void OnCancel(); vwVK ^B  
  afx_msg void OnAbout(); & PHejG_#  
  afx_msg void OnBrowse(); 3F5Y#[L`  
  afx_msg void OnChange(); RlRkw+%m  
 //}}AFX_MSG 8dg \_H_  
 DECLARE_MESSAGE_MAP() !.(Kpcrg  
}; uSZCJ#'G  
#endif axJuJ`+Y  
=oZHN,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file mWOW39Ku  
#include "stdafx.h" >]6f!;Rt  
#include "Capture.h" :n'$Txf  
#include "CaptureDlg.h" :%[=v (G[  
#include <windowsx.h> q=NI}k  
#pragma comment(lib,"hook.lib") v-zi ,]W  
#ifdef _DEBUG -f&16pc1t  
#define new DEBUG_NEW P`/;3u/P  
#undef THIS_FILE yc4?'k!  
static char THIS_FILE[] = __FILE__; -__RFxG  
#endif 9`83cL  
#define IDM_SHELL WM_USER+1 F`/-Q>Q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?C( ' z7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); d~i WV6Va  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; (G:A^z  
class CAboutDlg : public CDialog Gm,vLs9H$T  
{ }2WscxL  
 public: ~r/"w'dB  
  CAboutDlg(); 3AKT>Wy =  
  // Dialog Data 'r&az BO  
  //{{AFX_DATA(CAboutDlg) G,tJ\xMw8  
  enum { IDD = IDD_ABOUTBOX }; v"nN[_T  
  //}}AFX_DATA Bw;gl^:UG  
  // ClassWizard generated virtual function overrides r57&F`{  
  //{{AFX_VIRTUAL(CAboutDlg) 1&zvf4  
 protected: cT2&nZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q5[x2 s_d  
  //}}AFX_VIRTUAL :O`7kZ]=n  
  // Implementation ~d0:>8zQR  
 protected: OT1  
  //{{AFX_MSG(CAboutDlg) @ |bN[XL  
  //}}AFX_MSG 4( Q_J4}P  
  DECLARE_MESSAGE_MAP() /z<7gd~oU  
}; ^$8@B]*  
bsfYz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) G.2\Sw  
{ pbfIO47ZC  
 //{{AFX_DATA_INIT(CAboutDlg) f`r o {p  
 //}}AFX_DATA_INIT [I*)H7pt}  
} {1 VHz])I  
T1$fu(f  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BZS%p  
{ |l4tR  
 CDialog::DoDataExchange(pDX); xJG&vOf;?  
 //{{AFX_DATA_MAP(CAboutDlg) -^1}J  
 //}}AFX_DATA_MAP 8Zj=:;  
} N>R\,n|I  
dTV4 Q`Z  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1NHiW v  
 //{{AFX_MSG_MAP(CAboutDlg) I5nxY)v  
 // No message handlers OyI?P_0u  
 //}}AFX_MSG_MAP `,lm:x+(0  
END_MESSAGE_MAP() o#"U8N%r  
KCBA`N8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) L/ L#[  
: CDialog(CCaptureDlg::IDD, pParent) z7vc|Z|  
{ 5j8aMnvs  
 //{{AFX_DATA_INIT(CCaptureDlg) / .wO<l=  
  m_bControl = FALSE; @nC][gNv  
  m_bAlt = FALSE; b 7XTOB_HO  
  m_bShift = FALSE; ;jgk53lo  
  m_Path = _T("c:\\"); _Y{8FN(4  
  m_Number = _T("0 picture captured."); Hw0S/ytY  
  nCount=0; M~rN17S  
  bRegistered=FALSE; =`MxgK +  
  bTray=FALSE; s3(mkdXv  
 //}}AFX_DATA_INIT U0ZT9/4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Yfbo=yk  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oI\ Lepl*  
} ,9A1p06  
GHs,,J;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) {yo{@pdX>  
{ HbOLf  
 CDialog::DoDataExchange(pDX); m|') A  
 //{{AFX_DATA_MAP(CCaptureDlg) O/XG}G.x|  
  DDX_Control(pDX, IDC_KEY, m_Key); CF,-l B  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 9"W3t]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Yvi.l6JL  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); O{vVW9Q  
  DDX_Text(pDX, IDC_PATH, m_Path); ~U;M1>  
  DDX_Text(pDX, IDC_NUMBER, m_Number); YkN0,6  
 //}}AFX_DATA_MAP w3 n6md  
} `49: !M$i  
}WowgY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) c-jE1y<  
//{{AFX_MSG_MAP(CCaptureDlg) {PGiNY%q  
 ON_WM_SYSCOMMAND() zIzL7oD  
 ON_WM_PAINT() Y)O88C  
 ON_WM_QUERYDRAGICON() ugu|?z*dI  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) k)3b0T@b  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2_/H,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) lXT+OJF  
//}}AFX_MSG_MAP >z'T"R/  
END_MESSAGE_MAP() yG' 5:  
< `Xt?K  
BOOL CCaptureDlg::OnInitDialog() ^P!(* k#T  
{  JT,[;  
 CDialog::OnInitDialog(); ngt?9i;N  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9ZD>_a  
 ASSERT(IDM_ABOUTBOX < 0xF000); +^6a$ N  
 CMenu* pSysMenu = GetSystemMenu(FALSE); MJ\^i4  
 if (pSysMenu != NULL) euMJ c  
 { #Dz. 58A  
  CString strAboutMenu; 4)Bk:K  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .5^7Jwh  
  if (!strAboutMenu.IsEmpty()) 5i0vli /L  
  { ]/#3 P  
   pSysMenu->AppendMenu(MF_SEPARATOR); yI{4h $c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `o4%UkBpM  
  } ykS-5E`  
 } .A Dik}o  
 SetIcon(m_hIcon, TRUE); // Set big icon "C]v   
 SetIcon(m_hIcon, FALSE); // Set small icon qo*%S  
 m_Key.SetCurSel(0); ;hV-*;>  
 RegisterHotkey(); ,I2x&Ys&.  
 CMenu* pMenu=GetSystemMenu(FALSE); UfkQG`G9H  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Hk 0RT%PK  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {3* Ne /  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); r`\6+Ntb.  
 return TRUE; // return TRUE unless you set the focus to a control d)WGI RUx  
} D7lRZb  
TWeup6k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) H5eGl|Z5]^  
{ H3xMoSs  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O`^dy7>{U  
 { vNDf1B5z  
  CAboutDlg dlgAbout; D_Zt:tzO  
  dlgAbout.DoModal(); ,%T sfB  
 } jtv<{7a  
 else X:>,3[hx|  
 { OTj J'  
  CDialog::OnSysCommand(nID, lParam); l9Av@|  
 } [*K.9}+G_  
} wM``vx[/  
K^Ho%_)  
void CCaptureDlg::OnPaint() grxlGS~Q  
{ M:*)l(  
 if (IsIconic()) u.@B-Pf[Eo  
 { x+bC\,q  
  CPaintDC dc(this); // device context for painting @@3%lr71   
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w }=LC#le  
  // Center icon in client rectangle p f`vH`r  
  int cxIcon = GetSystemMetrics(SM_CXICON); XS(Q)\"  
  int cyIcon = GetSystemMetrics(SM_CYICON); Rn$TYCO  
  CRect rect; I]-"Tw  
  GetClientRect(&rect); l+#uQo6cqQ  
  int x = (rect.Width() - cxIcon + 1) / 2; ?~3Pydrb#  
  int y = (rect.Height() - cyIcon + 1) / 2; ^2`*1el  
  // Draw the icon 7o7*g 7  
  dc.DrawIcon(x, y, m_hIcon); |/X+2K}3  
 } C <d]0)  
 else [{q])P;  
 { tiPZ.a~k  
  CDialog::OnPaint(); {U)q)  
 } yIu_DFq%  
} Q"s]<MtdS  
Y#zHw< <E  
HCURSOR CCaptureDlg::OnQueryDragIcon() RZ0+Uu/J  
{ YS bS.tq  
 return (HCURSOR) m_hIcon; A~ @x8  
} ^@ Xzh:  
] 1s6=  
void CCaptureDlg::OnCancel() Xd@ d$  
{ v[4-?7-  
 if(bTray) /^9=2~b  
  DeleteIcon(); ?/fC"MJq?  
  CDialog::OnCancel(); 6Zx)L|B  
} 97pfMk1_  
f<;eNN  
void CCaptureDlg::OnAbout() Oh3A?!y#  
{ !8I80 :e_~  
 CAboutDlg dlg; !>?*gc.<  
 dlg.DoModal(); VQI[ J  
} &3|l4R\  
PQrc#dfc |  
void CCaptureDlg::OnBrowse() "XLFw;o  
{ O$7r)B6Cs  
 CString str; VKcVwq  
 BROWSEINFO bi; r<[G~n  
 char name[MAX_PATH]; hf:\^w  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); T*%O\&'r  
 bi.hwndOwner=GetSafeHwnd(); Z=be ki]  
 bi.pszDisplayName=name; =J`M}BBx  
 bi.lpszTitle="Select folder"; D$Ao-6QE W  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; bR<XQHl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); fwi -   
 if(idl==NULL) %-L T56T  
  return; c6cB {/g  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); MDoV84Fh  
 str.ReleaseBuffer(); t]hfq~Ft  
 m_Path=str; [ZL<Q  
 if(str.GetAt(str.GetLength()-1)!='\\') t8ORfO+  
  m_Path+="\\"; Prrz>  
 UpdateData(FALSE); _ZE&W  
} ;!B,P-Z"g  
bb}Fu/S  
void CCaptureDlg::SaveBmp() xk7VuS *  
{ \;1nEjIA  
 CDC dc; 'yR\%#s6  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); )  D5JA`  
 CBitmap bm; $U"pdf  
 int Width=GetSystemMetrics(SM_CXSCREEN); W)AfXy  
 int Height=GetSystemMetrics(SM_CYSCREEN); :)F0~Q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); y$9XHubu  
 CDC tdc; yeLd,M/I  
 tdc.CreateCompatibleDC(&dc); S;tvt/\!Z  
 CBitmap*pOld=tdc.SelectObject(&bm); _FkH;MGWS  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); IM_SZs  
 tdc.SelectObject(pOld); pp+z5  
 BITMAP btm; _adW>-wQ!d  
 bm.GetBitmap(&btm); Y/f8rN  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Zfd `Fu  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); v,Z?pYYo  
 BITMAPINFOHEADER bih; x b!&'cw  
 bih.biBitCount=btm.bmBitsPixel; a28`)17z  
 bih.biClrImportant=0; [&)*jc16  
 bih.biClrUsed=0; @+sYwlA~  
 bih.biCompression=0; B D [<>Wm  
 bih.biHeight=btm.bmHeight; s8;*Wt  
 bih.biPlanes=1; 7w}]9wCN?  
 bih.biSize=sizeof(BITMAPINFOHEADER); "(iQ-g Mm  
 bih.biSizeImage=size; juQ?k xOB  
 bih.biWidth=btm.bmWidth; yJdkDVxYr  
 bih.biXPelsPerMeter=0; h*?]A  
 bih.biYPelsPerMeter=0; fs2y$HN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); w& )ApfL  
 static int filecount=0; i^)JxEPr w  
 CString name; KB$Y8[  
 name.Format("pict%04d.bmp",filecount++); Qp-P[Tc  
 name=m_Path+name; ,"5xKF+cS  
 BITMAPFILEHEADER bfh; !?z"d  
 bfh.bfReserved1=bfh.bfReserved2=0; cRWYS[O?-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Pu(kCH{  
 bfh.bfSize=54+size; ;Q<2Y#  
 bfh.bfOffBits=54; v!#koqd1y.  
 CFile bf; _$yS4=.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @v/ 8}n  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |$[.X3i  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); e\ }'i-  
  bf.WriteHuge(lpData,size); \)cbg#v  
  bf.Close(); {6mFI1;q  
  nCount++; @DKph!c r  
 } x??H%'rP  
 GlobalFreePtr(lpData); ~BgNM O;|  
 if(nCount==1) \^dYmU  
  m_Number.Format("%d picture captured.",nCount); 0U! _o2]  
 else TVK*l*  
  m_Number.Format("%d pictures captured.",nCount); > 0c g  
  UpdateData(FALSE); ]Aj5 K  
} ]'<"qY  
EME}G42KN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |N|[E5Cn  
{ - H`, ` #{  
 if(pMsg -> message == WM_KEYDOWN) j rg B56LL  
 { OpmPw4?}  
  if(pMsg -> wParam == VK_ESCAPE) OG^#e+  
   return TRUE; ZeH=]G4Zv7  
  if(pMsg -> wParam == VK_RETURN) ^2nH6,LPS  
   return TRUE; %-an\.a.  
 } q*}$1 zb  
 return CDialog::PreTranslateMessage(pMsg); "5"{~3Gw^  
} HBZtg  
5>-~!Mg1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ",]A.,  
{ #KDN  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ tdNAR|  
  SaveBmp(); {m" I-VF  
  return FALSE; w}?,N  
} 1~S'' [  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 0NXaAf:2Z  
 CMenu pop; '\P+Bu]6&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [6%y RQ_  
 CMenu*pMenu=pop.GetSubMenu(0); ?+L7Bd(EF%  
 pMenu->SetDefaultItem(ID_EXITICON); Mlo:\ST|  
 CPoint pt; +<3e@s&  
 GetCursorPos(&pt); ?Skv2!X|  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); _8wT4|z5  
 if(id==ID_EXITICON) .K+5k`kd  
  DeleteIcon(); *rC%nmJwk!  
 else if(id==ID_EXIT) 7=HpEc  
  OnCancel(); BX2}ar  
 return FALSE; FLQ^J3A,I  
} _r`(P#Hy  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); dZ Ab' :  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W7w*VD|  
 AddIcon(); _ 3{8Zg  
 return res; r|3<UR%  
} 3u'@anre  
F 7X ] h  
void CCaptureDlg::AddIcon() 9Yji34eDZ  
{ k"+/DK,:  
 NOTIFYICONDATA data; *enT2Q  
 data.cbSize=sizeof(NOTIFYICONDATA); CL5t6D9Qi  
 CString tip; 5oR)  
 tip.LoadString(IDS_ICONTIP); C <H$}f  
 data.hIcon=GetIcon(0); zS `>65}e  
 data.hWnd=GetSafeHwnd(); >(W\Eh{J  
 strcpy(data.szTip,tip); E :UJ"6  
 data.uCallbackMessage=IDM_SHELL; j:0< tj E  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ZSn6JV'g  
 data.uID=98; )_K:A(V>  
 Shell_NotifyIcon(NIM_ADD,&data); X`7O%HiX/`  
 ShowWindow(SW_HIDE); Hm_&``='  
 bTray=TRUE; =j8g6#'u  
} uy([>8uu  
p%5(Qqmlk  
void CCaptureDlg::DeleteIcon() p+Fh9N<F9  
{ UbP$WIrq  
 NOTIFYICONDATA data; ;e Mb$px  
 data.cbSize=sizeof(NOTIFYICONDATA); WDh*8!)  
 data.hWnd=GetSafeHwnd(); H4BuxM_r  
 data.uID=98; +[#^c3x2  
 Shell_NotifyIcon(NIM_DELETE,&data); fAD {sg  
 ShowWindow(SW_SHOW); (n2=.9k!  
 SetForegroundWindow(); [L?WM>]%  
 ShowWindow(SW_SHOWNORMAL); q ;e/gP2  
 bTray=FALSE; @Dd3mWKq  
} 1+Bj` ACP  
YGZa##i  
void CCaptureDlg::OnChange() !uhh_3RH  
{ &izk$~  
 RegisterHotkey(); 8zpTCae^=7  
} `'ak/%Krh  
$ 3R5p  
BOOL CCaptureDlg::RegisterHotkey() xS_tB)C  
{ ;eP. B/N  
 UpdateData(); nDXy$f8  
 UCHAR mask=0; Suk;##I  
 UCHAR key=0; |q 0iX2W  
 if(m_bControl) qO>A 6  
  mask|=4; vcSb:('  
 if(m_bAlt) MwWN;_#EO)  
  mask|=2; NZuylQ)0  
 if(m_bShift) ":L d}~>  
  mask|=1; Ar`U / %Cu  
  key=Key_Table[m_Key.GetCurSel()]; BsYJIKfW  
 if(bRegistered){ s+a#x(7{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); tS[@?qP  
  bRegistered=FALSE; 1pTQMf a  
 } J!iK W  
 cMask=mask;  bRx}ih  
 cKey=key; }SGb`l  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); n;r W  
 return bRegistered; HG)h,&nc-  
} 8b $e)  
1Pd2%  
  四、小结 l6 T5]$  
?8$h%Ov-  
  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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