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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: a)!o @  
  xEa\f[.An  
  一、实现方法 lPe&h]@ >  
JB\UKZXw  
  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: p0]=QH  
mwO6g~@ `  
#pragma data_seg("shareddata") ^23~ZHu  
HHOOK hHook =NULL; //钩子句柄 m%0p\Y-/  
UINT nHookCount =0; //挂接的程序数目 I<DL=V  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7:e{;iG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 b8H{8{wi|  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 5G}?fSQ>  
static int KeyCount =0; Q1lyj7c#x  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 M+oHtX$  
#pragma data_seg() XjBW9a  
HGl|-nW>  
  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。 )|cc X  
MnmVl"(/  
  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: hy9\57_#  
1l9 G[o *  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Oz.HH  
cKey,UCHAR cMask) EX*HiZU>  
{ 4a&RYx  
 BOOL bAdded=FALSE; 2bz2KB5>  
 for(int index=0;index<MAX_KEY;index++){ //B&k`u  
  if(hCallWnd[index]==0){ ;2G*wR  
   hCallWnd[index]=hWnd; &.3"Uo\#  
   HotKey[index]=cKey; OU E (I3_  
   HotKeyMask[index]=cMask; }ZYd4h|g\z  
   bAdded=TRUE; 3s*mbk[J  
   KeyCount++; `4r 3l S  
   break; _9ao?:  
  } +tB=OwU%0  
 } ]IaMp788  
 return bAdded; ~"gA,e-)  
} rV.}PtcFY  
//删除热键 ` #0:gEo  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @b\$yB@z  
{ 1> ?M>vK  
 BOOL bRemoved=FALSE; n>z9K')  
 for(int index=0;index<MAX_KEY;index++){ IZf{nQ[0  
  if(hCallWnd[index]==hWnd){ >[f?vrz  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ hy1oq7F(Q  
    hCallWnd[index]=NULL; 'I|v[G$l  
    HotKey[index]=0; j\yjc/m  
    HotKeyMask[index]=0; H;is/  
    bRemoved=TRUE; !6 #X>S14  
    KeyCount--; _=>He=v/  
    break; P-[-pi@  
   } I]|Pq  
  } oE @a'*.\  
 } &md`$a/  
 return bRemoved;  OHN_  
} RIR\']WN  
_1X!EH"  
BX/8O<s0  
  DLL中的钩子函数如下: ?JbilK}a  
+D6YR$_<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ';k5?^T  
{ W<{h,j8  
 BOOL bProcessed=FALSE; |o"?gB}Dh  
 if(HC_ACTION==nCode) sQ3 [<  
 { QP==?g3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 JBj]najN  
   switch(wParam) xh-o}8*n"  
   {  z9f-.72"X  
    case VK_MENU: /A\8 mL8  
     MaskBits&=~ALTBIT; 'd0~!w  
     break; 810|Tj*U%  
    case VK_CONTROL: =}^9 wP  
     MaskBits&=~CTRLBIT; uo:J\E  
     break; U)TUOwF  
    case VK_SHIFT: 299H$$WS,Z  
     MaskBits&=~SHIFTBIT; g @Z))M+  
     break; b1q"!+8y  
    default: //judge the key and send message e)IzQ7Zex  
     break; >IafUy  
   } _rMg}F"  
   for(int index=0;index<MAX_KEY;index++){ AF{\6<m  
    if(hCallWnd[index]==NULL) yZ7&b&2nLn  
     continue; (y'hyJo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zC:ASt  
    { krxo"WgD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p>,|50|  
     bProcessed=TRUE; r+!YI k  
    } D>r&}6<  
   } .Z`R^2MU  
  } >~rTqtKd  
  else if((lParam&0xc000ffff)==1){ //有键按下 O^PKn_OJ  
   switch(wParam) ?5__oT  
   { 3d8L6GJ  
    case VK_MENU: [Y/} ^  
     MaskBits|=ALTBIT; OF>mF~  
     break; 2>9C-VL2  
    case VK_CONTROL: 1.JK3 3  
     MaskBits|=CTRLBIT; .#!lP/.eQP  
     break; Y|m +dT6  
    case VK_SHIFT: jwe*(k]z  
     MaskBits|=SHIFTBIT; lgAoJ[  
     break; g9pZ\$J&  
    default: //judge the key and send message ~\SGb_2  
     break; OnziG+ak  
   } $p8xEcQdU#  
   for(int index=0;index<MAX_KEY;index++){ T~?Ff|qFC  
    if(hCallWnd[index]==NULL) @ y.?:7I  
     continue; >{ ]%F*p4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G5_=H,Vmd  
    { g'f@H-KCD  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~D+bh~  
     bProcessed=TRUE; # +>oZWVc  
    } ldcqe$7,  
   } 68|E9^`l  
  } ;}WeTA_-[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 mUC)gA/  
   for(int index=0;index<MAX_KEY;index++){ PQt")[  
    if(hCallWnd[index]==NULL) w(Ovr`o?9t  
     continue; SGRp3,1\4%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Jrf=@m\dk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); KkyVSoD\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n80?N}  
   } ,pfG  
  } %Xg4b6<9  
 } R{4^t97wH{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #Pau\|e_  
} uc{Ihw  
g/_5unI}u  
  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: !TH) +zi  
Kn{4;Xk\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3NqB <J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c ]-<vkpV  
Ny7S  
  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: o[4}h:> dq  
l4YbKnp]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c]<5zyl"j1  
{ 0o4XUW   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) k'Hs}zeNn  
 { s) t@ol  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 M?49TOQA  
  SaveBmp(); *R,5h2;  
  return FALSE; qq`4<0I>  
 } nPtuTySG  
 …… //其它处理及默认处理 bs&43Ae  
} }K>d+6qk5  
dDMJ'  
@{e}4s?7od  
  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。 ]q[D>6_  
i"FtcP^  
  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。 ~/U 1xk%  
[aLI '  
  二、编程步骤 @bLy,Xr&  
B@))8.h]  
  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"; t+ TdLDJR  
I{&[[7H  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; iVr JQ  
v~C Czg  
  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; :4w ?#  
 A@('pA85  
  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; Hio0HL-  
S+6.ZZ9c  
  5、 添加代码,编译运行程序。 M0"_^?  
{ uFO/  
三、程序代码 Qljpx?E  
V &T~zh1  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL MJ)RvNF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) D) P._?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ W i.& e  
#if _MSC_VER > 1000 VGN5<?PrN  
#pragma once >6-`}G+|  
#endif // _MSC_VER > 1000 `RW HN/U  
#ifndef __AFXWIN_H__ Uc>lGo1j  
#error include 'stdafx.h' before including this file for PCH Z\rwO>3  
#endif 4"ZP 'I;  
#include "resource.h" // main symbols ]N]!o#q}L  
class CHookApp : public CWinApp 6|=f$a  
{ }>|s=uGW  
 public: d1T!+I  
  CHookApp(); 4at?(B+  
  // Overrides DCa^ u'f  
  // ClassWizard generated virtual function overrides -i|}m++  
  //{{AFX_VIRTUAL(CHookApp) Gz0]}]A  
 public: IPpN@  
  virtual BOOL InitInstance(); y.k~Y0  
  virtual int ExitInstance(); !BF; >f`  
  //}}AFX_VIRTUAL ^7*11%Q  
  //{{AFX_MSG(CHookApp) >Tx?%nQ  
  // NOTE - the ClassWizard will add and remove member functions here. TX/Xt7#R:  
  // DO NOT EDIT what you see in these blocks of generated code ! ,p a {qne  
  //}}AFX_MSG Tidn-2L73O  
  DECLARE_MESSAGE_MAP() t?gic9 q  
}; T!{w~'=F  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); fOrH$?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); kZ:ZtE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); re<{ >  
BOOL InitHotkey(); t@;p  
BOOL UnInit(); |Ez>J+uye(  
#endif B[Scr5|  
P+sW[:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 3?yg\  
#include "stdafx.h" (C L%>5V  
#include "hook.h" i]4I [!  
#include <windowsx.h> n@i HFBb  
#ifdef _DEBUG WwFm*4{[o  
#define new DEBUG_NEW r6qj7}\  
#undef THIS_FILE >=>2m2z=  
static char THIS_FILE[] = __FILE__; Or+U@vAnk  
#endif  _[3D  
#define MAX_KEY 100 o|:b;\)b  
#define CTRLBIT 0x04 "sCRdx]_  
#define ALTBIT 0x02 +\A,&;!SR  
#define SHIFTBIT 0x01 Qv-_ jZ  
#pragma data_seg("shareddata") rlLMT6r.8  
HHOOK hHook =NULL; _VN?#J)o  
UINT nHookCount =0; 6 "sSoj  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ]6` %  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ObS3 M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey !.gIHY  
static int KeyCount =0; ITBE|b  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift p l0\2e)  
#pragma data_seg() 3$R1ipb  
HINSTANCE hins; +'a^f5  
void VerifyWindow(); !pW0qX\1n  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) d0ks G$  
//{{AFX_MSG_MAP(CHookApp) ND;#7/$>  
// NOTE - the ClassWizard will add and remove mapping macros here. %> eiAB_b  
// DO NOT EDIT what you see in these blocks of generated code! 2zb"MEOS5  
//}}AFX_MSG_MAP fr3d  
END_MESSAGE_MAP() +6\Zj)  
* u>\57W  
CHookApp::CHookApp() o.!Dq7 R  
{ M }D}K\)  
 // TODO: add construction code here, 2ilQXy  
 // Place all significant initialization in InitInstance vE?G7%,  
} aFYIM`?(  
oc`H}Wvn  
CHookApp theApp; F41=b4/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3 0H?KAV  
{ ,"ZMRq  
 BOOL bProcessed=FALSE; ?a5!H*,  
 if(HC_ACTION==nCode) T5h H  
 { 4[e X e$  
  if((lParam&0xc0000000)==0xc0000000){// Key up zF<R'XP  
   switch(wParam) `;C  V=,M  
   { 5;EvNu  
    case VK_MENU: L4HI0Mx  
     MaskBits&=~ALTBIT; =,M5KDk`  
     break; *] X'( /b_  
    case VK_CONTROL: lo+A%\1  
     MaskBits&=~CTRLBIT; :F?C)F  
     break; 4B.*g-L   
    case VK_SHIFT: tD)J*]G  
     MaskBits&=~SHIFTBIT; ga+dt  
     break; y)@wjH{6  
    default: //judge the key and send message i_%_x*  
     break; !|(NgzDP/  
   } K|, .C[  
   for(int index=0;index<MAX_KEY;index++){ 1+s;FJ2}  
    if(hCallWnd[index]==NULL) Gc|idjW4  
     continue; K"MX!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y6a3t G  
    { O0.*Pmt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (9a^$C*  
     bProcessed=TRUE; g 7H(PF?  
    } fJg+Ryo  
   } z03K=aZ  
  } oEv 'dQ9  
  else if((lParam&0xc000ffff)==1){ //Key down Dd|VMW=  
   switch(wParam) 2^7`mES  
   { h376Be{P  
    case VK_MENU: guR/\z$D@C  
     MaskBits|=ALTBIT; TLH1>pY&  
     break; eR>oq,  
    case VK_CONTROL: Bzf^ivT3L  
     MaskBits|=CTRLBIT; I?CZQ+}Hq  
     break; i ct])  
    case VK_SHIFT: H5|;{q:j  
     MaskBits|=SHIFTBIT; 6=C<>c %+  
     break; tw@X> G1z  
    default: //judge the key and send message PJ#,2=n~  
     break; L/K(dkx  
   } e0 ecD3  
   for(int index=0;index<MAX_KEY;index++) UN#S;x*  
   { |G<|F`Cj  
    if(hCallWnd[index]==NULL) ccxNbU  
     continue; 0y\Z9+G:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i%?*@uj  
    { * ;FdD{+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }GM'.yutX  
     bProcessed=TRUE; (ZlU^Gw#UB  
    } z1a7*)8P  
   } -9?]IIVb  
  } ;_=&-mz  
  if(!bProcessed){ omx=  
   for(int index=0;index<MAX_KEY;index++){ A#,ZUOPGH  
    if(hCallWnd[index]==NULL) ;'1d1\wiDQ  
     continue; %]i15;{X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xE}>,O|'q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8ao_i=&x  
   } UiNP3TJ'L  
  } * T1_;4i  
 } {!`6zBsP  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #vlgwA  
} Y]a@j !  
!G|@6W`  
BOOL InitHotkey() dO\"?aiD  
{ p#tI;"\y  
 if(hHook!=NULL){ %yC,^  
  nHookCount++; v$9y,^p@e  
  return TRUE; |s_GlJV.  
 } DmcZta8n]  
 else #dHa,HUk  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); yhJ@(tu.Gd  
  if(hHook!=NULL) :4|4=mkr  
   nHookCount++; !)$Zp\Sg  
  return (hHook!=NULL); ~TtiO#,t  
} +ZV5o&V>  
BOOL UnInit() rm_Nn8p,  
{ Hn:Crl y#  
 if(nHookCount>1){ 7+*WH|Z@  
  nHookCount--; ^.y\(=  
  return TRUE; iy"*5<;*DD  
 } %iB,IEw  
 BOOL unhooked = UnhookWindowsHookEx(hHook); `D9$v(Ztr  
 if(unhooked==TRUE){ |W^IlqTH  
  nHookCount=0; O/LXdz0B  
  hHook=NULL; EQ_aa@M7  
 } h+,@G,|D  
 return unhooked; dRMx[7jVA  
} : Dp0?&_  
F'Z,]b'st3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w-jVC^C]  
{ 5r0YA IJ  
 BOOL bAdded=FALSE; lhJ'bYI  
 for(int index=0;index<MAX_KEY;index++){ 30{ gI0jk  
  if(hCallWnd[index]==0){ p ll)Y  
   hCallWnd[index]=hWnd; $[|mGae  
   HotKey[index]=cKey; *1"+%Z^  
   HotKeyMask[index]=cMask; =~gvZV-<  
   bAdded=TRUE; a'T;x`b8U,  
   KeyCount++; JXx wr)i  
   break; Xa&kIq}(g  
  } /wv0i3_e  
 } <3 uNl  
 return bAdded; '%;m?t% q  
} Dp:BU|r  
vQ.R{!",>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EM_d8o)`B  
{ gM]:Ma  
 BOOL bRemoved=FALSE; d zMb5puH  
 for(int index=0;index<MAX_KEY;index++){ MK*r+xfSae  
  if(hCallWnd[index]==hWnd){ Q{/Ef[(a@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^z\cyT%7t  
    hCallWnd[index]=NULL; Nboaf  
    HotKey[index]=0; $;PMkUE  
    HotKeyMask[index]=0; {RPI]DcO/  
    bRemoved=TRUE; V[V[~;Py  
    KeyCount--; 4Tc~b3\!Y  
    break; N>E_%]Ch  
   } D+c>F5  
  } IGgL7^MF  
 } ,: ^u-b|  
 return bRemoved; {{1G`;|v 9  
} *^r}"in  
o;*Q}Gr<M  
void VerifyWindow() fV~~J2IK  
{ _v:SP LU  
 for(int i=0;i<MAX_KEY;i++){ `@%LzeGz  
  if(hCallWnd!=NULL){ ` %}RNC  
   if(!IsWindow(hCallWnd)){ -RLOD\ZBh  
    hCallWnd=NULL; 4e  
    HotKey=0; y>LBl]  
    HotKeyMask=0; @+DX.9  
    KeyCount--; DfB7*+x{  
   } #Q5o)x  
  } F[MFx^sT{  
 } MfkZ  
} {)Xy%QV  
&j6erwaT  
BOOL CHookApp::InitInstance() p}P-6&k,U  
{ #z42C?V  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); cb bFw  
 hins=AfxGetInstanceHandle(); d5-qZ{W  
 InitHotkey(); r<\u6jF  
 return CWinApp::InitInstance(); }2oc#0  
} 0`H# '/  
M\=2uKG#  
int CHookApp::ExitInstance() ,u m|1dh  
{ DNi+"[~&P  
 VerifyWindow();  lRQYpc\  
 UnInit(); @nf`Gw ;  
 return CWinApp::ExitInstance(); [hs ds\  
} 8k79&|  
P~dcW  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =u;MCQ[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) z%kULTL  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !9x}  
#if _MSC_VER > 1000 R-Sym8c  
#pragma once TZ`SZDc7_  
#endif // _MSC_VER > 1000 6:2vP NF  
rlD8D|ZG  
class CCaptureDlg : public CDialog V8(-  
{ pot~<d`:K"  
 // Construction P;*(hY5&  
 public: :EyD+!LJ  
  BOOL bTray; E"0>yl)  
  BOOL bRegistered; >d6|^h'0  
  BOOL RegisterHotkey(); adw2x pj  
  UCHAR cKey; .(vwIb8\_  
  UCHAR cMask; .V*^|UXbHi  
  void DeleteIcon(); Hv, LS ;W  
  void AddIcon(); 45oR=At n  
  UINT nCount; 0IpmRH/  
  void SaveBmp(); /tLVX} &  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;rS{:  
  // Dialog Data KlqY@Xt  
  //{{AFX_DATA(CCaptureDlg) Js;h%  
  enum { IDD = IDD_CAPTURE_DIALOG }; hOeRd#AQK  
  CComboBox m_Key; z)"=:o7  
  BOOL m_bControl; ~XIb\m9H  
  BOOL m_bAlt; ,0k;!YK  
  BOOL m_bShift; f!"w5qC^  
  CString m_Path; gFh*eCo   
  CString m_Number; @XVTU  
  //}}AFX_DATA ;G!q Y  
  // ClassWizard generated virtual function overrides cZ06Kx..  
  //{{AFX_VIRTUAL(CCaptureDlg) W8<%[-r  
 public: %$mA03[MQ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ZB{EmB0W  
 protected: liSmjsk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support w>YDNOk  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); <uJ@:oWG7  
  //}}AFX_VIRTUAL qWw=8Bq  
  // Implementation \DzGQ{`~m  
 protected: yHGADH0B  
  HICON m_hIcon; pXUSLs  
  // Generated message map functions (#'>(t(4  
  //{{AFX_MSG(CCaptureDlg) NO3/rJ6-  
  virtual BOOL OnInitDialog(); q*KAk{kR(v  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 16 $B>  
  afx_msg void OnPaint(); ;nGa.= "L  
  afx_msg HCURSOR OnQueryDragIcon(); o}!PQ#`M  
  virtual void OnCancel(); h$*!8=M  
  afx_msg void OnAbout(); Ls%MGs9PI  
  afx_msg void OnBrowse(); `2snz1>!j  
  afx_msg void OnChange(); _Y!IEAU/#  
 //}}AFX_MSG 8- i#8'/x  
 DECLARE_MESSAGE_MAP() n|;Im&,  
}; 6wxs1G  
#endif $u.z*b_yy  
D]}G.v1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Yz bXuJ4  
#include "stdafx.h" .u:GjL'$  
#include "Capture.h" a =QCp4^  
#include "CaptureDlg.h" kP"9&R`E  
#include <windowsx.h> ceV}WN19l  
#pragma comment(lib,"hook.lib") HP =+<]?{G  
#ifdef _DEBUG 8_8l.!~  
#define new DEBUG_NEW =Uh$&m  
#undef THIS_FILE ^s=8!=A(  
static char THIS_FILE[] = __FILE__; L$-T,Kze  
#endif Ned."e  
#define IDM_SHELL WM_USER+1 KSvE~h[#+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ys~x $  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pUTr!fR  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; rKn~qVls  
class CAboutDlg : public CDialog &vJH$R  
{ :>*7=q=  
 public: _L PHPj^Pg  
  CAboutDlg(); xwr8`?]y  
  // Dialog Data "8RSvT<W^5  
  //{{AFX_DATA(CAboutDlg) pGZ8F  
  enum { IDD = IDD_ABOUTBOX }; G9lUxmS<  
  //}}AFX_DATA 7"mc+QOp  
  // ClassWizard generated virtual function overrides Zh,71Umz  
  //{{AFX_VIRTUAL(CAboutDlg) g ?k=^C  
 protected: . ^u,.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;I*o@x_  
  //}}AFX_VIRTUAL Ei|\3Kx  
  // Implementation ]q.0!lh+WL  
 protected: ZEQEx]Y  
  //{{AFX_MSG(CAboutDlg) s>en  
  //}}AFX_MSG ^_6|X]tz1T  
  DECLARE_MESSAGE_MAP() /mMV{[  
}; Q@niNDaW2  
KP"+e:a%  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Gq6*SaTk  
{ <UI [%yXj  
 //{{AFX_DATA_INIT(CAboutDlg) <[phnU^ 8  
 //}}AFX_DATA_INIT yuVs YV@"  
} GmG 5[?)  
AdmC&!nH  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :+Z%; Dc  
{ =I4lL]>  
 CDialog::DoDataExchange(pDX); >Q/Dk7#  
 //{{AFX_DATA_MAP(CAboutDlg) VQs5"K"  
 //}}AFX_DATA_MAP C}X\|J  
} n?Q|)2 2  
qLCR] _*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2|,VqVb  
 //{{AFX_MSG_MAP(CAboutDlg) DqPw#<"H  
 // No message handlers !<oe=)Iz|  
 //}}AFX_MSG_MAP TseGXYH  
END_MESSAGE_MAP() ~@!bsLSMU  
*#2h/Q.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) j+!v}*I![  
: CDialog(CCaptureDlg::IDD, pParent) 9ati`-y2  
{ ~[ F`"  
 //{{AFX_DATA_INIT(CCaptureDlg) )1z@  
  m_bControl = FALSE; pw#-_  
  m_bAlt = FALSE; @L`jk+Y0vF  
  m_bShift = FALSE; >sF)Bo Lc  
  m_Path = _T("c:\\"); cS$_\65  
  m_Number = _T("0 picture captured."); 0a7Ppntb@  
  nCount=0;  9!GM{  
  bRegistered=FALSE; .VqhV  
  bTray=FALSE; jylD6IT  
 //}}AFX_DATA_INIT ye97!nIg@  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 RNL9>7xV  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "|NI]Kv  
} wq{hF<  
;|RTx  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Q/?$x*\>  
{ [KQi.u  
 CDialog::DoDataExchange(pDX); Kq!3wb;  
 //{{AFX_DATA_MAP(CCaptureDlg) }b}m3i1  
  DDX_Control(pDX, IDC_KEY, m_Key); yVfC-Z   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); vX>)je5#  
  DDX_Check(pDX, IDC_ALT, m_bAlt); gIfh3D=yX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ~,Qp^"rlW  
  DDX_Text(pDX, IDC_PATH, m_Path); YR70BOxK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *Ly6`HZ9  
 //}}AFX_DATA_MAP [;N'=]`  
} NlqImM=r,  
>~f]_puT  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) d5b%  W3  
//{{AFX_MSG_MAP(CCaptureDlg) N mG#   
 ON_WM_SYSCOMMAND() QP x^_jA  
 ON_WM_PAINT() t-AmX) $  
 ON_WM_QUERYDRAGICON() rOYx b }1  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) MA\V[32H  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) GY*p?k<i  
 ON_BN_CLICKED(ID_CHANGE, OnChange) cNrg#Asen&  
//}}AFX_MSG_MAP /QQ*8o8  
END_MESSAGE_MAP() Q59suL   
?0.NIu,,o  
BOOL CCaptureDlg::OnInitDialog() +3gp%`c4  
{ =wJX 0A|  
 CDialog::OnInitDialog(); K"6vXv4QO  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =M1I>  
 ASSERT(IDM_ABOUTBOX < 0xF000); {:s f7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); qK+5NF|  
 if (pSysMenu != NULL) Sdo-nt  
 { Ef\ -VKh  
  CString strAboutMenu; hP h-+Hb  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i%/+5gq  
  if (!strAboutMenu.IsEmpty()) x;S @bY  
  { S/ *E,))m  
   pSysMenu->AppendMenu(MF_SEPARATOR); =I<R!ZSN  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); aXVFc5C\  
  } Qrv<lE1V;  
 } t1".0  
 SetIcon(m_hIcon, TRUE); // Set big icon .}t e>]A*  
 SetIcon(m_hIcon, FALSE); // Set small icon kstIgcI  
 m_Key.SetCurSel(0); ?< />Z)  
 RegisterHotkey(); 3Vwh|1?  
 CMenu* pMenu=GetSystemMenu(FALSE); x2EUr,7  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); F [M,]?   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); K9[UB  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); "Q0@/bYq  
 return TRUE; // return TRUE unless you set the focus to a control EnR}IY&sI  
} ! if   
<%d>v-=B  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !1k_PY5)  
{ \zY!qpX<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) O^.#d  
 { ~&T~1xsFJ  
  CAboutDlg dlgAbout; \m,PA'nd/  
  dlgAbout.DoModal(); XX@ZQcN  
 } dG{A~Z z  
 else Y*^[P,+J*}  
 { 0@(&eH=  
  CDialog::OnSysCommand(nID, lParam); EPm/r  
 } ;jXgAAz7  
} *hx  
vd ZW%-A&\  
void CCaptureDlg::OnPaint() d$RIS+V  
{ ` A>@]d  
 if (IsIconic()) +TJCLZ..  
 { M{@(G5  
  CPaintDC dc(this); // device context for painting =(Mch~  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); -~0^P,yQ  
  // Center icon in client rectangle hrn+UL:d  
  int cxIcon = GetSystemMetrics(SM_CXICON); P?\6@_ Z  
  int cyIcon = GetSystemMetrics(SM_CYICON); @- xjfC\d  
  CRect rect; ]'}L 1r  
  GetClientRect(&rect); G2D$aSh  
  int x = (rect.Width() - cxIcon + 1) / 2; ,hVli/  
  int y = (rect.Height() - cyIcon + 1) / 2; x4 yR8n(  
  // Draw the icon pb}*\/s  
  dc.DrawIcon(x, y, m_hIcon);  &HW9Jn  
 } KwS@D9bok  
 else tc! #wd+u  
 { uYN`:b8  
  CDialog::OnPaint(); WLT"ji0w2  
 } *VcJ= b 2Y  
} *p U x8yB  
| (93gJ  
HCURSOR CCaptureDlg::OnQueryDragIcon() vQCy\Gi   
{ }j%5t ~Qa  
 return (HCURSOR) m_hIcon; XZ7Lk)IR  
} "x-j~u?  
TDh5lI  
void CCaptureDlg::OnCancel() N['  .BN  
{ tA;}h7/Lc~  
 if(bTray) ;`&kZi60Hz  
  DeleteIcon(); siI;"?  
  CDialog::OnCancel(); WcAkCH!L  
} nUO0Ce  
T[gv0|+  
void CCaptureDlg::OnAbout() ]DcFySyv  
{ HtFDlvdy]  
 CAboutDlg dlg; $Yq9P0Ya  
 dlg.DoModal(); ;+%rw2Z,B  
} r&CiSMS*  
t0S 1QC+  
void CCaptureDlg::OnBrowse() Cy e.gsCT  
{ z_HdISy0  
 CString str; 3w=J'(RU  
 BROWSEINFO bi; Vk suu@cch  
 char name[MAX_PATH]; 5+vaE 2v  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _/|\aqF.  
 bi.hwndOwner=GetSafeHwnd(); aUp g u"  
 bi.pszDisplayName=name; ]9CFIh  
 bi.lpszTitle="Select folder"; ^W ^OfY  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @dK Tx#gZ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); s<Ziegmw|g  
 if(idl==NULL) d=(mw_-?  
  return; LoV<:|GTI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); occ7zcA  
 str.ReleaseBuffer(); ]Um/FAW  
 m_Path=str; ?4,T}@P  
 if(str.GetAt(str.GetLength()-1)!='\\') 1?}T=)3+$  
  m_Path+="\\"; DQ3<$0  
 UpdateData(FALSE); dN q$}  
} h{Y",7] !  
N7"W{"3D  
void CCaptureDlg::SaveBmp() L0,'mS  
{ 2G7Wi!J  
 CDC dc; &d!GImcxQ  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); >Tgv11[  
 CBitmap bm; 9;{C IMg&  
 int Width=GetSystemMetrics(SM_CXSCREEN); as|<}:V  
 int Height=GetSystemMetrics(SM_CYSCREEN); qX%_uOw:%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 1zv'.uu.,  
 CDC tdc; :;}P*T*PU  
 tdc.CreateCompatibleDC(&dc); %J(:ADu]  
 CBitmap*pOld=tdc.SelectObject(&bm); I9Xuok!0>=  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ye&;(30Oq  
 tdc.SelectObject(pOld); 9*g Z-#  
 BITMAP btm; jA1 +x:Wq  
 bm.GetBitmap(&btm); C+$#y2"z#n  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; $4LzcwG  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); {) XTk &"  
 BITMAPINFOHEADER bih; 79gT+~z   
 bih.biBitCount=btm.bmBitsPixel; !L(^(;$Kgr  
 bih.biClrImportant=0; C dn J&N{  
 bih.biClrUsed=0; u 9e@a9c  
 bih.biCompression=0; K+eM   
 bih.biHeight=btm.bmHeight; -w2/w@&  
 bih.biPlanes=1; J1k>07}|  
 bih.biSize=sizeof(BITMAPINFOHEADER); K- v#.e4  
 bih.biSizeImage=size; D*jM1w_`  
 bih.biWidth=btm.bmWidth; t.<i:#rj>l  
 bih.biXPelsPerMeter=0; |Cv!,]9:r  
 bih.biYPelsPerMeter=0; ( .:e,l{U%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ah"o~Cbj  
 static int filecount=0; l?e.9o2-  
 CString name; WWY6ha  
 name.Format("pict%04d.bmp",filecount++); yWK)vju"  
 name=m_Path+name; A.SvA Yn  
 BITMAPFILEHEADER bfh; ?,z}%p  
 bfh.bfReserved1=bfh.bfReserved2=0; $Sq:q0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ch]IzdD  
 bfh.bfSize=54+size; Q &8-\  
 bfh.bfOffBits=54; }j Xfb@`K  
 CFile bf; O- wzz  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -7ep{p-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); C|bET  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); >4TO=i  
  bf.WriteHuge(lpData,size); i-1op> Y  
  bf.Close(); &C}*w2]0S  
  nCount++; =_CzH(=f#  
 } rq{$,/6.  
 GlobalFreePtr(lpData); }BEB1Q}L  
 if(nCount==1) Wtnfa{gP%  
  m_Number.Format("%d picture captured.",nCount); F?0Ykjh3  
 else OUnA;_  
  m_Number.Format("%d pictures captured.",nCount); pa+hL,w{6  
  UpdateData(FALSE); #!=tDc &  
} VbYdZCC  
ZJoM?g~WFI  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) }f ?y* H  
{ mH(:?_KrS-  
 if(pMsg -> message == WM_KEYDOWN) $ nb[GV  
 { UMi~14& ;  
  if(pMsg -> wParam == VK_ESCAPE) "]*tLL:`  
   return TRUE; ^iA9%zp  
  if(pMsg -> wParam == VK_RETURN) 7V>M]  
   return TRUE; X w1*(ffk  
 } *~`(RV  
 return CDialog::PreTranslateMessage(pMsg); h[ ZN+M  
} i8p6Xht  
jXJyc'm7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6BlXLQ,8q  
{ JF]JOI6.e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ sO Y:e/_F  
  SaveBmp(); A/(a`"mK|'  
  return FALSE; _c07}aQ ],  
} (FV >m  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ (7Qo  
 CMenu pop; hH.G#-JO  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~*7]r`6\@  
 CMenu*pMenu=pop.GetSubMenu(0); GgU/ !@  
 pMenu->SetDefaultItem(ID_EXITICON); g(g& TO  
 CPoint pt; [g,}gyeS(  
 GetCursorPos(&pt); \V:^h [ad  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); z?zL97H  
 if(id==ID_EXITICON) >_} I.\ X  
  DeleteIcon(); !D6]JPX  
 else if(id==ID_EXIT) qs6aB0ln  
  OnCancel(); 3|7QU ld  
 return FALSE; %<5'=t'|-U  
} |Tw~@kT@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xw%0>K[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 7)m9"InDI  
 AddIcon(); 1C.VnzRnJ  
 return res; !>tL6+yj  
} d9ihhqq3}  
Bvj0^fSm  
void CCaptureDlg::AddIcon() 2%1hdA<  
{ G}*hM$F  
 NOTIFYICONDATA data; )u">it+  
 data.cbSize=sizeof(NOTIFYICONDATA); *hrd5na  
 CString tip; +\'t E~V  
 tip.LoadString(IDS_ICONTIP); sLFl!jX  
 data.hIcon=GetIcon(0); [aS*%Heu  
 data.hWnd=GetSafeHwnd(); X&zis1A<  
 strcpy(data.szTip,tip); E`q_bn  
 data.uCallbackMessage=IDM_SHELL; #$vEGY}1  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8L XHk l  
 data.uID=98; :gT4K-O j  
 Shell_NotifyIcon(NIM_ADD,&data); 6~{C.No}  
 ShowWindow(SW_HIDE); zDp2g)  
 bTray=TRUE; Z)!C'cb  
} J4utIGF  
:N@^?q{b  
void CCaptureDlg::DeleteIcon() z#N@ 0R  
{ 3T 9j@N77  
 NOTIFYICONDATA data; ^8tEach  
 data.cbSize=sizeof(NOTIFYICONDATA); C~[,z.FvO  
 data.hWnd=GetSafeHwnd(); s{++w5s  
 data.uID=98; :,^gj  
 Shell_NotifyIcon(NIM_DELETE,&data); K,]=6 Rj  
 ShowWindow(SW_SHOW); c,22*.V/  
 SetForegroundWindow(); )[  ,A_3E  
 ShowWindow(SW_SHOWNORMAL); g0 [w-?f  
 bTray=FALSE; .hiSw  
} -di o5a  
0c &+|> !  
void CCaptureDlg::OnChange() o  K@"f9  
{ VL^EHb7  
 RegisterHotkey(); d _ e WcI  
} Q\)F;:|  
p<2,=*2  
BOOL CCaptureDlg::RegisterHotkey() *"kM{*3:v  
{ .pq%?&  
 UpdateData(); E4!Fupkpf  
 UCHAR mask=0; \ jA~9  
 UCHAR key=0; .543N<w  
 if(m_bControl) pp2~Meg  
  mask|=4; /(T?j!nPE  
 if(m_bAlt) S'14hk<  
  mask|=2; Qd6FH2Pl  
 if(m_bShift) WHI`/FM  
  mask|=1; =xrv~  
  key=Key_Table[m_Key.GetCurSel()]; E9}C  #  
 if(bRegistered){ zQA`/&=Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); H"KCK6  
  bRegistered=FALSE; OB7hlW  
 } r>\bW)e  
 cMask=mask; '|4!5)/K  
 cKey=key; 2tLJU  Z1  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :4s1CC+@\  
 return bRegistered; :EH=_"  
} eFAnFJ][L  
"j-CZ\]U|  
  四、小结 q;U,s)Uz^  
yN c2@  
  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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