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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: -k:x e:$  
  }T PyHq"  
  一、实现方法 r(>812^\  
xxg/vaQt=s  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: xVYa-I[Z  
Z0M,YSnz  
#pragma data_seg("shareddata") JPL`/WA 0  
HHOOK hHook =NULL; //钩子句柄 1.N2!:&G|  
UINT nHookCount =0; //挂接的程序数目 ^?0'\Z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 W8x&:5Fc)3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Xhyn! &H5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey VcsM Da  
static int KeyCount =0; \ -Xtb m  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3_9CREZCl  
#pragma data_seg() FzSL[S4i  
PZ#up{[o  
  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。 OVxg9  
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  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: 0nBDF79  
b)#rUI|O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR g9;s3qXiG  
cKey,UCHAR cMask) `gC J[  
{ `t9k!y!GV  
 BOOL bAdded=FALSE; E`xpZ>$mPx  
 for(int index=0;index<MAX_KEY;index++){ a* }>yad  
  if(hCallWnd[index]==0){ 4o ";p}[b  
   hCallWnd[index]=hWnd; Cb|1Jtb  
   HotKey[index]=cKey; 2( I4h[  
   HotKeyMask[index]=cMask; -da: j-_  
   bAdded=TRUE; K } T=j+  
   KeyCount++; @d^DU5ats>  
   break; RO3q!+a$/  
  } | Vlx:  
 } G{,DoCM5WL  
 return bAdded; pd`m//G  
} CAx eJ`Q  
//删除热键 r9! s@n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }/\`'LQ  
{ \ntUxPox.  
 BOOL bRemoved=FALSE; [n&ES\o#(  
 for(int index=0;index<MAX_KEY;index++){ 2wPc yD  
  if(hCallWnd[index]==hWnd){ h-O;5.m-P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ _ iDVd2X"H  
    hCallWnd[index]=NULL; R i,_x  
    HotKey[index]=0; (GGosXU-v  
    HotKeyMask[index]=0; (~bx%  
    bRemoved=TRUE; zN;P_@U  
    KeyCount--; !;vv-v,LQ  
    break; 3G<4rH]  
   } @PLJ)RL  
  } H2Z e\c  
 } GL-b})yy  
 return bRemoved; }CZw'fhVWO  
} dIh+h|:  
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  DLL中的钩子函数如下: KXl!VD,#`=  
TF!v,cX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p_]b=3wt~  
{ -F*vN'  
 BOOL bProcessed=FALSE;  Pw +nO  
 if(HC_ACTION==nCode) [MKG5=kaE  
 { Qm*ZOz'i  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ? * ,  
   switch(wParam)  f9<"  
   {  \RPwSx  
    case VK_MENU: gs/ocu  
     MaskBits&=~ALTBIT; z$d<ep{6  
     break; \o72VHG66  
    case VK_CONTROL: -&]!ig5v  
     MaskBits&=~CTRLBIT; l\Ww^   
     break; D:IG;Rsc  
    case VK_SHIFT: M=&,+#z<V  
     MaskBits&=~SHIFTBIT; /J!:_Nq  
     break; @x743}Y\  
    default: //judge the key and send message QS\wtTXj  
     break; P zM yUv  
   } <HN{.p{  
   for(int index=0;index<MAX_KEY;index++){ olL? 6)gC  
    if(hCallWnd[index]==NULL) 1ZRkVHiz0  
     continue; q &{<HcP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X's<+hK&  
    { #pK" ^O*!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); S-Bx`e9'  
     bProcessed=TRUE; i'>5vU0?3  
    } )cP)HbOd=  
   } [eOv fD  
  } v4'kV:;&  
  else if((lParam&0xc000ffff)==1){ //有键按下 dkDPze9l  
   switch(wParam) wsH_pF  
   { q~W:W}z  
    case VK_MENU: bX:h"6{=R  
     MaskBits|=ALTBIT; q3h& V  
     break; dT?3Q;>B?  
    case VK_CONTROL: T,>L  
     MaskBits|=CTRLBIT; nfGI4ZE  
     break; kQlwl9  
    case VK_SHIFT: N]| >\  
     MaskBits|=SHIFTBIT; cL03V?} ~  
     break; rMZuiRz*  
    default: //judge the key and send message 9^8OIv?m8  
     break; )i[Vq|n  
   } -TG ="U  
   for(int index=0;index<MAX_KEY;index++){ b8YdONdy  
    if(hCallWnd[index]==NULL) Kdp($L9r  
     continue; G-RDQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :lvBcFw  
    { idX''%"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); GPL%8 YY  
     bProcessed=TRUE; hh%?E\qM  
    } f^u-Myk  
   } $7g+/3Fu^  
  } f38e(Q];m  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6'@{ * u  
   for(int index=0;index<MAX_KEY;index++){ x{<l8vL=-c  
    if(hCallWnd[index]==NULL) E!mv}  
     continue; 'x"(OdM:[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2=0HQXXrq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8=joVbs  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 udLIAV*  
   } 6j6;lNUc  
  } fxr#T'i  
 } {N/%%O.b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \#B<'J9.`  
} iQ2j ejd3(  
S >CKm:7  
  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: %Pt){9b  
|Rhqi  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q% d1n*;+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Bi :!"Nw[X  
|}UkVLc_^  
  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: \( #"g  
>-<iY4|[d  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^V96l Kt/  
{ hEsi AbTyF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) C}Kl!  
 { +FqE fY4j  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 FN=WU< 5  
  SaveBmp(); $GGaR x  
  return FALSE; y*-_  
 }  fPPP|  
 …… //其它处理及默认处理 SZHgXl3:  
} p WJ EFm  
(?zD!% k  
<"P-7/j3j  
  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。 hdrsa}{g  
\y=oZk4  
  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。 q^EY?;Y  
DmLx"%H3  
  二、编程步骤 |llJ%JhF  
_(kaaWJ  
  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"; 0.n[_?<(  
flFdoEV.U)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; d,JDfG)  
@&WHX#  
  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; Jut&J]{h  
u YT$$'S  
  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;  G7a l@  
JDE_*xaUV  
  5、 添加代码,编译运行程序。 VLkAsM5}%  
[{BY$"b#:  
三、程序代码 bD:0k.`  
 L1 /`/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL l$/lbwi%  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) wL 4Y%g  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ '=fk;AiQ  
#if _MSC_VER > 1000 %60 OS3  
#pragma once 0C/ZcfFU~  
#endif // _MSC_VER > 1000 =huV(THU  
#ifndef __AFXWIN_H__ .)!QsBU  
#error include 'stdafx.h' before including this file for PCH *$NZi*z3  
#endif  xV5UaD<  
#include "resource.h" // main symbols y3s+.5;  
class CHookApp : public CWinApp RE%f'y  
{ KBN% TqH|  
 public: 9T24dofkJ  
  CHookApp(); |9c~kTjK  
  // Overrides #H>{>0q  
  // ClassWizard generated virtual function overrides PKSfu++Z  
  //{{AFX_VIRTUAL(CHookApp) c8JW]A`9b)  
 public: 4Qf sxg  
  virtual BOOL InitInstance(); t n5  
  virtual int ExitInstance(); o" ,8   
  //}}AFX_VIRTUAL d)Yl D]I  
  //{{AFX_MSG(CHookApp) 3 J04 $cD  
  // NOTE - the ClassWizard will add and remove member functions here. 71c[ `h*0{  
  // DO NOT EDIT what you see in these blocks of generated code ! \{lv~I  
  //}}AFX_MSG Zg(Y$ h\  
  DECLARE_MESSAGE_MAP() v CaN[  
}; UGhEaKH~R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [c 8=b,EI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H,X|-B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0Lxz?R x]<  
BOOL InitHotkey(); 8v& \F  
BOOL UnInit(); rXX>I;`&  
#endif D'#Q`H  
1I9v`eT4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <GNLDpj  
#include "stdafx.h" S v>6:y9?G  
#include "hook.h" k5.5$<< T  
#include <windowsx.h> "lL+Heq>V  
#ifdef _DEBUG -y+>^45  
#define new DEBUG_NEW x 6`!  
#undef THIS_FILE "+"=iwEAz  
static char THIS_FILE[] = __FILE__; +&`W\?.~  
#endif != ,4tg`  
#define MAX_KEY 100 "S%t\  
#define CTRLBIT 0x04 EX`P(=zD  
#define ALTBIT 0x02 EbQLMLD%  
#define SHIFTBIT 0x01 `S@TiD*  
#pragma data_seg("shareddata") )O~[4xV~  
HHOOK hHook =NULL; .z`70ot?  
UINT nHookCount =0; s3Vb2C*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^QRg9s,T<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |:=o\eu&  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /8h=6"  
static int KeyCount =0; H0Pxw P>q  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Bvn3:+(47  
#pragma data_seg() \j>7x  
HINSTANCE hins; 37/n"\4  
void VerifyWindow(); `@h|+`h  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) +tqErh?Al  
//{{AFX_MSG_MAP(CHookApp) 85GIEUvH/  
// NOTE - the ClassWizard will add and remove mapping macros here. &[.`xZ(|  
// DO NOT EDIT what you see in these blocks of generated code! H,!xTy"Wh  
//}}AFX_MSG_MAP )#}>,,S  
END_MESSAGE_MAP() RwWg:4   
"#j}F u_!  
CHookApp::CHookApp() B )r-,M  
{ A IP~A]T  
 // TODO: add construction code here, az(<<2=  
 // Place all significant initialization in InitInstance PLyity-L[7  
} \n) ',4mY  
Zh<;r;2  
CHookApp theApp; )|F|\6:ne  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +T+@g8S  
{ h4? x_"V"  
 BOOL bProcessed=FALSE; FRBu8WW0L  
 if(HC_ACTION==nCode) n{ ;j  
 { )u)=@@k21  
  if((lParam&0xc0000000)==0xc0000000){// Key up &7aWVKon  
   switch(wParam) fGo4&( U  
   { g>@JGzMLP  
    case VK_MENU: 1sQIfX#2f  
     MaskBits&=~ALTBIT; ~7P)$[  
     break; W7i|uTM  
    case VK_CONTROL: t;&XIG~  
     MaskBits&=~CTRLBIT; ,S8K!  
     break; @w[i%F,&`  
    case VK_SHIFT: i q(PC3e`V  
     MaskBits&=~SHIFTBIT; 'pdTV:]zA  
     break; XIHN6aQ{X  
    default: //judge the key and send message |p11Jt[  
     break; -Aj)<KNx[  
   } (\9`$   
   for(int index=0;index<MAX_KEY;index++){ e#(Ck{e  
    if(hCallWnd[index]==NULL) ETe4I`d{  
     continue; !_<6}:ZB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %qP[+N&  
    { )h!cOEt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); A=Wg0eYy\  
     bProcessed=TRUE; m~ tvuz I  
    } E7fx4kV  
   } `Lf'/q   
  } n|SV)92o1  
  else if((lParam&0xc000ffff)==1){ //Key down z$32rt8{`v  
   switch(wParam) k_al*iM>H  
   { >qjV{M  
    case VK_MENU: }]?Si6_ZZ  
     MaskBits|=ALTBIT; 1 DWoL}Z  
     break; 157_0  
    case VK_CONTROL: \N>-+r  
     MaskBits|=CTRLBIT; wl Oeoi  
     break; tli.g  
    case VK_SHIFT: )ZJvx%@i  
     MaskBits|=SHIFTBIT; <j'V}|3  
     break; l]nt@0+  
    default: //judge the key and send message _FLEz|%~  
     break; vJkc/7  
   } N%y i4  
   for(int index=0;index<MAX_KEY;index++) ]b/]^1-(b  
   { )*,/L <  
    if(hCallWnd[index]==NULL) @ D+ftb/  
     continue; 'Wonz<{'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UkV?,P@l  
    { (C2 XFg_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Nk`UQ~g$  
     bProcessed=TRUE; Hd|l6/[xz  
    } p5Q]/DhG  
   } f^WTsh]  
  } KhCP9(A=Qo  
  if(!bProcessed){ v<qh;2  
   for(int index=0;index<MAX_KEY;index++){ '=\}dav!  
    if(hCallWnd[index]==NULL) h~MV=7 lE  
     continue; Y Y:Bw W:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) f& 4_:'-,  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); CT|+?  
   } Kz4S6N c  
  } )s2] -n}W  
 } 0&.CAHb}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); A KNx~!%2  
} v\0G`&^1  
Q=\ Oa(I  
BOOL InitHotkey() LSo!_tY  
{ 8!g `bC#%  
 if(hHook!=NULL){ S)rZE*~2  
  nHookCount++; z`y9<+  
  return TRUE; YeX*IZX8  
 } i%glQT  
 else x%P|T3Qy5  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); "(koR Q  
  if(hHook!=NULL) Gn]36~)*H  
   nHookCount++; .p`4>XA  
  return (hHook!=NULL); g8),$:Uw  
} )^h6'h`  
BOOL UnInit() cH]tZ$E`  
{ dn6B43w  
 if(nHookCount>1){ KWwtL"3  
  nHookCount--; W+XWS,(  
  return TRUE; 7\u+%i;YZ  
 } 3:%k pnO  
 BOOL unhooked = UnhookWindowsHookEx(hHook); jjpYg  
 if(unhooked==TRUE){ *OVB;]D3+  
  nHookCount=0; 6Z/`p~e  
  hHook=NULL; ;`9f<d#\  
 } 1C[9}}  
 return unhooked; y!e]bvN  
} }fpya2Xt  
fGgt[f[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;?6vKpj;  
{ A=CeeC]}  
 BOOL bAdded=FALSE; L\yVE J9x  
 for(int index=0;index<MAX_KEY;index++){ y>{: [L9*  
  if(hCallWnd[index]==0){ :fRXLe1=  
   hCallWnd[index]=hWnd; \?:L>-&h8  
   HotKey[index]=cKey; h\m35'v!  
   HotKeyMask[index]=cMask; gjF5~ `  
   bAdded=TRUE; <J[ le=  
   KeyCount++; ? @V R%z  
   break; fS]& ?$q  
  } ,N/@=As9$  
 } D{|qP nE4  
 return bAdded; =O/Bte.  
} I8F+Z  
] !UYl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~iw&^p|=K  
{ rvA>khu0/  
 BOOL bRemoved=FALSE; HN47/]"*  
 for(int index=0;index<MAX_KEY;index++){ WxdQ^#AE  
  if(hCallWnd[index]==hWnd){ )cf i@-J+#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ myx/|-V"F  
    hCallWnd[index]=NULL; !Jg;%%E3:i  
    HotKey[index]=0; (Guzj*12  
    HotKeyMask[index]=0; ]{-.?W*$  
    bRemoved=TRUE; e r" w{  
    KeyCount--; +qxPUfN  
    break; T.q2tC[bR  
   } b`0tfXzS5  
  } L aTcBcI  
 } tobE3Od4  
 return bRemoved; 77e*9/6@  
} ^df wWP  
Z['.RF'`  
void VerifyWindow() J )1   
{ dzcF1 5H1  
 for(int i=0;i<MAX_KEY;i++){ ;!yK~OBxt  
  if(hCallWnd!=NULL){ :I"CQ C[Z  
   if(!IsWindow(hCallWnd)){ E}^V@ :j>  
    hCallWnd=NULL; k(Yz2  
    HotKey=0; xh6(~'$  
    HotKeyMask=0; =;Id["+  
    KeyCount--; K2m>D=w  
   } EZtU6kW"  
  } Xj?Wvt  
 } QxT'\7f  
} ~C-Sr@ a?/  
IQQv+af5  
BOOL CHookApp::InitInstance() [|\6AIoS  
{ GR,2^]<{  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [%IOB/{N  
 hins=AfxGetInstanceHandle(); Da^q9,|  
 InitHotkey(); +a#&W}K  
 return CWinApp::InitInstance(); ;i{B,!#  
} r}U6LE?>  
C*`WMP*  
int CHookApp::ExitInstance() l,ny=Q$[1'  
{ tzI|vVT,  
 VerifyWindow(); AbU`wr/h 4  
 UnInit(); $0*sj XV  
 return CWinApp::ExitInstance(); F?L]Dff  
} jKSj);  
D{9a'0J  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file egmUUuO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zcpL[@B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ dg D-"-O  
#if _MSC_VER > 1000 mY|c7}>V;  
#pragma once ~Ps*i]n(  
#endif // _MSC_VER > 1000 G T>'|~e  
<J%qzt}  
class CCaptureDlg : public CDialog 1=VyD<dNG6  
{ xBHf~:!  
 // Construction PZ[-a-p40  
 public: xL* psj  
  BOOL bTray; ci,(]T +!  
  BOOL bRegistered; $`pf!b2Z  
  BOOL RegisterHotkey(); UBo0c?,4  
  UCHAR cKey; S)CsH1Q  
  UCHAR cMask; '2,~'Zk  
  void DeleteIcon(); opX07~1  
  void AddIcon(); FlO?E3d  
  UINT nCount; O[X*F2LC4  
  void SaveBmp(); g 2Fg  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor s5,@=(,  
  // Dialog Data 8)B{x[?|  
  //{{AFX_DATA(CCaptureDlg) Za.}bR6?Y  
  enum { IDD = IDD_CAPTURE_DIALOG }; [d`Jw/4n  
  CComboBox m_Key; YSjc=  
  BOOL m_bControl; @kXuC<  
  BOOL m_bAlt; =dm9+ff  
  BOOL m_bShift; =fSTncq  
  CString m_Path; o)Q4+njT@  
  CString m_Number; XY0kd&N8  
  //}}AFX_DATA ,@Csa#  
  // ClassWizard generated virtual function overrides ;W0J  
  //{{AFX_VIRTUAL(CCaptureDlg) 0'&C5v'  
 public: g%2G=gR$?z  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 'afW'w@  
 protected: m:_#kfC&K"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b"g^Jm! j  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G<Z}G8FW^  
  //}}AFX_VIRTUAL \Z*:l(  
  // Implementation jAQ{H  
 protected: zK0M WyXO  
  HICON m_hIcon; %PW-E($o<  
  // Generated message map functions :?f<tNU$  
  //{{AFX_MSG(CCaptureDlg) k|fM9E  
  virtual BOOL OnInitDialog(); &{)<Q(g  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1q}32^>+o  
  afx_msg void OnPaint(); +\dVC,,=^g  
  afx_msg HCURSOR OnQueryDragIcon(); $G=^cNB|JB  
  virtual void OnCancel(); C&O8fNB_  
  afx_msg void OnAbout(); AArLNXzVW  
  afx_msg void OnBrowse(); l&& i`  
  afx_msg void OnChange(); 3h bHS~  
 //}}AFX_MSG >WHajYO"  
 DECLARE_MESSAGE_MAP() v}>g* @  
}; Z<U,]iZB  
#endif 8~y!X0Ov!  
6Ga'_P:  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lw=kTYbq  
#include "stdafx.h" LcKc#)'EE  
#include "Capture.h" \Y xG  
#include "CaptureDlg.h" l@Lk+-[D  
#include <windowsx.h> +m_ .?V6  
#pragma comment(lib,"hook.lib") 3qV^RW&  
#ifdef _DEBUG ]H`wE_2tu  
#define new DEBUG_NEW gD$&OkH  
#undef THIS_FILE osc8;B/  
static char THIS_FILE[] = __FILE__; PpRS4*nR  
#endif G>~/  
#define IDM_SHELL WM_USER+1 1I;q@g0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s$y_(oU,D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '{`KYKLP+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4'faE="1)S  
class CAboutDlg : public CDialog Fd8nR9A  
{ d /jx8(0  
 public: dcKpsX  
  CAboutDlg(); P IG,a~  
  // Dialog Data U=v>gNba  
  //{{AFX_DATA(CAboutDlg) >A )Sl'  
  enum { IDD = IDD_ABOUTBOX }; .)*&NY!nsl  
  //}}AFX_DATA $`xpn#l z  
  // ClassWizard generated virtual function overrides 8;M,l2pmR{  
  //{{AFX_VIRTUAL(CAboutDlg) \t{iyUxY  
 protected: `=Mk6$%Cs  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5|0}bv O  
  //}}AFX_VIRTUAL n3e,vP? R  
  // Implementation /G5KNSi  
 protected: e {6wFN  
  //{{AFX_MSG(CAboutDlg) _d!sSyk`  
  //}}AFX_MSG 5?3v;B6  
  DECLARE_MESSAGE_MAP() E2Sj IR}  
}; [w](x  
2<7pe@c98  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) W{Qb*{9  
{ l(Y32]Z   
 //{{AFX_DATA_INIT(CAboutDlg) \]Y<d  
 //}}AFX_DATA_INIT .p{lzI9  
} eg~ Dm>Es  
y0O(n/  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) [KUkv  
{ `&I6=,YLp  
 CDialog::DoDataExchange(pDX); ~ESw* 6s9  
 //{{AFX_DATA_MAP(CAboutDlg) j1Ys8k%$l  
 //}}AFX_DATA_MAP =Vh]{ y~$  
} OL1xxzo  
$7X;FmlG&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *Y1s4FXu2  
 //{{AFX_MSG_MAP(CAboutDlg) do`'K3a"  
 // No message handlers }51QUFhL0  
 //}}AFX_MSG_MAP ^uo,LTq+  
END_MESSAGE_MAP() padV|hF3(e  
]:ca=&>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Fpo}UQQbc  
: CDialog(CCaptureDlg::IDD, pParent) oVqx)@$K  
{ %X\J%Fj  
 //{{AFX_DATA_INIT(CCaptureDlg) H28-;>'`  
  m_bControl = FALSE; M"mvPr9  
  m_bAlt = FALSE;  WLWfe-  
  m_bShift = FALSE; @3eMvbI  
  m_Path = _T("c:\\"); \;%D;3Au  
  m_Number = _T("0 picture captured."); =ZHN]PP  
  nCount=0; yI=nu53BV  
  bRegistered=FALSE; Z4 z|B&  
  bTray=FALSE; (9bU\4F\  
 //}}AFX_DATA_INIT h-.^*=]R6  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 uA`e  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); vkLt#yj~  
} W)`>'X`  
EQnU:a  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Ym%# "  
{ kFJ]F |^7  
 CDialog::DoDataExchange(pDX); 7<kr|-  
 //{{AFX_DATA_MAP(CCaptureDlg) w2$ L;q  
  DDX_Control(pDX, IDC_KEY, m_Key); 2C0j.Ib  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2SC'Z>A  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 0#c-qy  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1`II%mf[  
  DDX_Text(pDX, IDC_PATH, m_Path); i Q3wi  
  DDX_Text(pDX, IDC_NUMBER, m_Number); K[SzE{5=P  
 //}}AFX_DATA_MAP ldG8hK  
} HJr*\%D}1  
G>Bgw>#_  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) / /G&=i$  
//{{AFX_MSG_MAP(CCaptureDlg) * *A JFc  
 ON_WM_SYSCOMMAND() vU/sQt8  
 ON_WM_PAINT() qHrIs-NR  
 ON_WM_QUERYDRAGICON() "% i1zQo&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $sL+k 'dY  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3b?-83a  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >$<Q:o}^  
//}}AFX_MSG_MAP zBrIhL]95  
END_MESSAGE_MAP() tIA)LF  
r& RJ'z  
BOOL CCaptureDlg::OnInitDialog() `,  |l  
{ 823y;  
 CDialog::OnInitDialog(); | /-# N  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); AED 9vDE  
 ASSERT(IDM_ABOUTBOX < 0xF000); D9(4%^HxV1  
 CMenu* pSysMenu = GetSystemMenu(FALSE); uPFbKSJj  
 if (pSysMenu != NULL) 48gpXcc@|  
 { z:n JN%Qb  
  CString strAboutMenu; R]kH$0`  
  strAboutMenu.LoadString(IDS_ABOUTBOX); oW7;t  
  if (!strAboutMenu.IsEmpty()) 5W{|? l{  
  { T~>&m~} +  
   pSysMenu->AppendMenu(MF_SEPARATOR); U:/_T>f%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v@X[0J_8  
  } Mc  
 } JjAO9j%  
 SetIcon(m_hIcon, TRUE); // Set big icon |bRi bB  
 SetIcon(m_hIcon, FALSE); // Set small icon ZZL%5{ w_  
 m_Key.SetCurSel(0); Y\H4.$V  
 RegisterHotkey(); xAsy07J?  
 CMenu* pMenu=GetSystemMenu(FALSE); .<P@6Jq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); esTK4z]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); e?aSM  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); I1ibrn  
 return TRUE; // return TRUE unless you set the focus to a control yC }x6xG  
} g2lv4Tiq-  
)P/~{Ci:T&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) lr,i5n{6  
{ i;)r|L `V?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +c'I7bBr  
 { Mf:x9#  
  CAboutDlg dlgAbout; |qk%UN<  
  dlgAbout.DoModal(); t5p#g <$  
 } {.,y v>%  
 else 4.&et()}  
 { 7_7^&.Hh  
  CDialog::OnSysCommand(nID, lParam); piUfvw  
 } <>1*1%m  
} ~m'8BK  
3~0Xe  
void CCaptureDlg::OnPaint() Bsz;GnD|r  
{ a'@?c_y;$  
 if (IsIconic()) aG1[85:,\i  
 { c_2kHT  
  CPaintDC dc(this); // device context for painting H% c{ }F  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); DB1Y`l  
  // Center icon in client rectangle LD5E  
  int cxIcon = GetSystemMetrics(SM_CXICON); RA62Z&W3  
  int cyIcon = GetSystemMetrics(SM_CYICON);  s@3<]  
  CRect rect; Z Q9's  
  GetClientRect(&rect); )&elr,b /y  
  int x = (rect.Width() - cxIcon + 1) / 2; Boa?Ghg  
  int y = (rect.Height() - cyIcon + 1) / 2; =7("xz %  
  // Draw the icon @}N;C ..Y$  
  dc.DrawIcon(x, y, m_hIcon); [C~{g#  
 } jr5x!@rb  
 else W/R-~C e  
 { \RP=Gf  
  CDialog::OnPaint(); Neb%D8/Kn  
 } hta$ k%2  
} b+}*@xhl  
BUKh5L  
HCURSOR CCaptureDlg::OnQueryDragIcon() !NOvKC!  
{ Y|i!\Ae  
 return (HCURSOR) m_hIcon; [+y/qx79  
} o;:a6D`   
-1u N Z{0  
void CCaptureDlg::OnCancel() Z.0^:rVp~  
{ >G+?X+9  
 if(bTray) *SZ*S %oS3  
  DeleteIcon(); 6{I5 23g  
  CDialog::OnCancel(); ZGOI8M]@  
} tU7eW#"w  
RT2a:3f  
void CCaptureDlg::OnAbout() dQFx]p3L  
{ $}7WJz:  
 CAboutDlg dlg; v4< x 4  
 dlg.DoModal(); dTP$7nfe  
} : XZ  
.~ W^P>t  
void CCaptureDlg::OnBrowse() p>p=nLK  
{ iyhB;s5Rgw  
 CString str; ffyKAZ{]po  
 BROWSEINFO bi; !$5U\"M  
 char name[MAX_PATH]; Zt[1RMO  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @le23+q  
 bi.hwndOwner=GetSafeHwnd(); R=M${u<t  
 bi.pszDisplayName=name; yz2NB?)  
 bi.lpszTitle="Select folder"; g<{W\VOPm  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |3g:q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F3a"SKMW  
 if(idl==NULL) [w)6OT  
  return; 7<?v!vQ}-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Hca)5$yL  
 str.ReleaseBuffer(); jKu"Vi|j>  
 m_Path=str; >b/0i$8  
 if(str.GetAt(str.GetLength()-1)!='\\') L*VGdZ  
  m_Path+="\\"; ;z7iUke0%  
 UpdateData(FALSE); 'bg%9}  
} 9W7H",wR  
B)"WG7W E  
void CCaptureDlg::SaveBmp() ~c3CyOab  
{ S*CRVs  
 CDC dc; Kc\0-3 Z  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ziy~~J  
 CBitmap bm; zn3i2MWS  
 int Width=GetSystemMetrics(SM_CXSCREEN); [w~1e)D  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?z60b=f8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ^IM;D)X&:  
 CDC tdc; I#f<YbzD  
 tdc.CreateCompatibleDC(&dc); \Jv6Igu  
 CBitmap*pOld=tdc.SelectObject(&bm); PHD$E s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); =N n0)l  
 tdc.SelectObject(pOld); _Oq (&I  
 BITMAP btm; g!%csf  
 bm.GetBitmap(&btm); c66Iy"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :/Nz' n  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); VxfFk4  
 BITMAPINFOHEADER bih; /gHRJ$2|Sx  
 bih.biBitCount=btm.bmBitsPixel; 82V xk  
 bih.biClrImportant=0; +3t(kQ  
 bih.biClrUsed=0; Md_\9G .e  
 bih.biCompression=0; Q_1EAxt  
 bih.biHeight=btm.bmHeight; Vo(d)"m?  
 bih.biPlanes=1; 4F 8`5)RM  
 bih.biSize=sizeof(BITMAPINFOHEADER); .)u,sYZA|  
 bih.biSizeImage=size; |)IN20  
 bih.biWidth=btm.bmWidth; <H E'5b  
 bih.biXPelsPerMeter=0; Jo h&Ay  
 bih.biYPelsPerMeter=0; K#";!  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 88)0Xi|]KP  
 static int filecount=0; JUU0Tx:`9)  
 CString name; )CXJRo`j0  
 name.Format("pict%04d.bmp",filecount++); |g 4!Yd  
 name=m_Path+name; bU:"dqRm<  
 BITMAPFILEHEADER bfh; ^#%$?w>wI  
 bfh.bfReserved1=bfh.bfReserved2=0; +V7*vlx-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5'>(|7~%\  
 bfh.bfSize=54+size; f+$/gz  
 bfh.bfOffBits=54; P/Sv^d5=e  
 CFile bf; c6dL S  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9}2I'7]  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .6OE8w 1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o~^hsm[44J  
  bf.WriteHuge(lpData,size); D@4hQC\  
  bf.Close(); A"z')   
  nCount++; T?7 ZF+yo6  
 } Yq) wE|k/  
 GlobalFreePtr(lpData); kS?!"zk>  
 if(nCount==1) iQin|$F_O  
  m_Number.Format("%d picture captured.",nCount); -\>Bphu,y  
 else ";",r^vr\  
  m_Number.Format("%d pictures captured.",nCount); Fz)z&WT  
  UpdateData(FALSE); 0VsrAV0  
} l!q i:H<=1  
"W:'cIw  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) $o1G xz  
{ bEy j8=P;  
 if(pMsg -> message == WM_KEYDOWN) <r 3F*S=  
 { S <|e/![@  
  if(pMsg -> wParam == VK_ESCAPE) 0-4WLMx  
   return TRUE; 2lHJ&fck<  
  if(pMsg -> wParam == VK_RETURN) ='OPU5(;O  
   return TRUE; O&\;BF5:R  
 } aCFO ]  
 return CDialog::PreTranslateMessage(pMsg); cy/;qd+!M  
} &Cdk%@Tj]B  
1"~@UcJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @ou g^]a  
{ b^5rV5d  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ MWsBZJRr  
  SaveBmp(); YJXh|@LT  
  return FALSE; /_w oCLwQ#  
} v*l1"0$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o& $Fc8bH  
 CMenu pop; Scs \nF2  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); B7T(9Tj+Fh  
 CMenu*pMenu=pop.GetSubMenu(0); i~.L{K  
 pMenu->SetDefaultItem(ID_EXITICON); /[t]m,p$yq  
 CPoint pt; =Q Otag1;  
 GetCursorPos(&pt); `2d,=.X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 1|n,s-  
 if(id==ID_EXITICON) SukRJvi  
  DeleteIcon(); RNp3lXf O  
 else if(id==ID_EXIT) #th^\pV  
  OnCancel(); $0sU h]7y  
 return FALSE; 8TC%]SvYim  
} FrB}2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0D:J d6\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =f{V<i~q  
 AddIcon(); f(7 /  
 return res; !}Cd_tj6  
} oC.:mI  
~0t] `<y=  
void CCaptureDlg::AddIcon() tX&Dum$  
{ {&"rv<p  
 NOTIFYICONDATA data; -&D~TL#  
 data.cbSize=sizeof(NOTIFYICONDATA); "F}a nPY  
 CString tip; qS|bpC0x  
 tip.LoadString(IDS_ICONTIP); *#+XfOtF  
 data.hIcon=GetIcon(0); |AuN5|obI  
 data.hWnd=GetSafeHwnd(); Nx;U]O6A  
 strcpy(data.szTip,tip); ?7/n s>}  
 data.uCallbackMessage=IDM_SHELL; ,H1j&]E!  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; O,]t.1V  
 data.uID=98; l)HF4#Bs  
 Shell_NotifyIcon(NIM_ADD,&data); .P9ALJP(b  
 ShowWindow(SW_HIDE); y7ijT='8  
 bTray=TRUE; m(XcPb  
} C B=H1+  
r2qxi'  
void CCaptureDlg::DeleteIcon() Pc`d@q  
{ C8DZ:3E$c  
 NOTIFYICONDATA data; w,;CrW T2t  
 data.cbSize=sizeof(NOTIFYICONDATA); I/_`/mQ  
 data.hWnd=GetSafeHwnd(); -?&wD["y  
 data.uID=98; UP 75}h9  
 Shell_NotifyIcon(NIM_DELETE,&data); 73rr"> 9#0  
 ShowWindow(SW_SHOW); S3`zB?7,  
 SetForegroundWindow(); ke2'?,f  
 ShowWindow(SW_SHOWNORMAL); {1>V~e8t  
 bTray=FALSE; ?o"wyF A*  
} 2 Do^N5y  
sr sDnf  
void CCaptureDlg::OnChange() a(NN%'fDD  
{ FG38)/  
 RegisterHotkey(); %=S~[&8C  
} 4[9~g=y>  
uqnoE;57^  
BOOL CCaptureDlg::RegisterHotkey() IFH%R>={  
{ |k{?\(h;  
 UpdateData(); q4|TwRx~  
 UCHAR mask=0; 0:@:cz=#*  
 UCHAR key=0; .&T JSIx$  
 if(m_bControl) n Uz 2~z  
  mask|=4; @]Aul9.h  
 if(m_bAlt) ;KWR/?ec  
  mask|=2; #&\^{Z  
 if(m_bShift) Gc<Jx|Q7  
  mask|=1; 5<<e_n.2q  
  key=Key_Table[m_Key.GetCurSel()]; ` Cdk b5  
 if(bRegistered){ CY? ]o4IV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [kMXr'TyPX  
  bRegistered=FALSE; c1'OIK C  
 } <:W]uT  
 cMask=mask; WhMr'l/e  
 cKey=key; #^" \WG7{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yrs![u  
 return bRegistered; :\NqGS=<  
} (?72 vCc  
M6jP>fbV*  
  四、小结  2(YZTaY  
<bDjAVq  
  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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