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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: fRTo.u  
  j[6Raf/(n  
  一、实现方法 ) gR=<oa  
1px\K8  
  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: nws"RcP+Z  
bXM/2Z?6  
#pragma data_seg("shareddata") }jF+`!*!  
HHOOK hHook =NULL; //钩子句柄 6ri\>QrF  
UINT nHookCount =0; //挂接的程序数目 -Cid3~mX3  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +Zk,2ri  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ep(g`e  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0"[`>K~7a8  
static int KeyCount =0; /vE]2Io  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !.fw,!}hOD  
#pragma data_seg() pJ, @Y>  
ED} 31L  
  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。 K X]oE+:  
> 8]j  
  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: rn.\tDeA  
cy~oPj]j  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =FW5Tkw0  
cKey,UCHAR cMask) AW5iV3  
{ y,+[$u7h  
 BOOL bAdded=FALSE; DlE_W+F  
 for(int index=0;index<MAX_KEY;index++){ e<gx~N9l'  
  if(hCallWnd[index]==0){ 9>,Qgp,w  
   hCallWnd[index]=hWnd; &d`^ E6#  
   HotKey[index]=cKey; m(sXk}e;1  
   HotKeyMask[index]=cMask; xk~Nmb}  
   bAdded=TRUE; <M[U#Q~?~e  
   KeyCount++; $M"0BZQ?y!  
   break; :XT?jdg  
  } 6&2LWaWMo$  
 } ;)!"Ty|  
 return bAdded; k4KHS<n0  
} C>|@& o1  
//删除热键 'b:Ne,<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ecH/Wz1  
{ 3/M.0}e  
 BOOL bRemoved=FALSE; #-u [$TA  
 for(int index=0;index<MAX_KEY;index++){ |;;!8VO3J  
  if(hCallWnd[index]==hWnd){ f1+qXMs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zREJ#r  
    hCallWnd[index]=NULL; Y9}8M27vQG  
    HotKey[index]=0;  YRB%:D@u  
    HotKeyMask[index]=0; Fm j=  
    bRemoved=TRUE; ]@xL=%   
    KeyCount--; |Svk^mq  
    break; S-E++f9D~  
   } 6 o[/F3`  
  } ,&a`d}g&G  
 } oJaAM|7uv  
 return bRemoved; QV,E #(\5  
} nx4P^P C  
dU;upS_-  
-4L!k'uR  
  DLL中的钩子函数如下: w4MwD?i]R  
@eQld\h'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VTh$a_P>  
{ 5A_4\YpDR  
 BOOL bProcessed=FALSE; `n-vjjG%#  
 if(HC_ACTION==nCode) ?=|kC*$/G  
 { -Fwh3F 4g  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ? J|4l[x  
   switch(wParam) 'm1.X-$V  
   {  /! ^P)yU,  
    case VK_MENU: ~mILA->F  
     MaskBits&=~ALTBIT; P%o44|[][  
     break; c" Y!$'|Q  
    case VK_CONTROL: 8l xY]UT  
     MaskBits&=~CTRLBIT; z<a2cQ?XQ  
     break; ! sYf<  
    case VK_SHIFT: #w~0uCzQ@  
     MaskBits&=~SHIFTBIT; s'2Rs^,hN  
     break; S=R 3"~p  
    default: //judge the key and send message StM/  
     break; {Jx7_T&  
   } PvOC5b  
   for(int index=0;index<MAX_KEY;index++){ P%GkcV  
    if(hCallWnd[index]==NULL) Xm[Czd]%  
     continue; $U'3MEEw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R+. Nn  
    { {fG|_+tl3o  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -Z?Ck!00  
     bProcessed=TRUE; Ku%6$C!,  
    } |>s v8/!  
   } ?6:cNdN  
  } Fd !iQ  
  else if((lParam&0xc000ffff)==1){ //有键按下 :Ee?K  
   switch(wParam) ],?pe  
   { IrO +5w  
    case VK_MENU: M]ap:  
     MaskBits|=ALTBIT; u:4["ViC  
     break; Kx]> fHK  
    case VK_CONTROL: #Go(tS~o  
     MaskBits|=CTRLBIT; W]LQ &f  
     break; IvSn>o  
    case VK_SHIFT: eti9nPjG  
     MaskBits|=SHIFTBIT; ]%XK)[:5_=  
     break; '?}R4w|)  
    default: //judge the key and send message tP]q4i  
     break; ^-L{/'[8M  
   } ?N#[<kd  
   for(int index=0;index<MAX_KEY;index++){ 6:RMU  
    if(hCallWnd[index]==NULL) |e"/Mf[  
     continue; OWV/kz5'H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +v1-.z  
    { Dm4B  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); F^sw0 .b  
     bProcessed=TRUE; 97x%2.\:  
    } ;tN4HiN  
   } s-5wbi.C  
  } RO(iHR3cA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 :1BM=_WwI  
   for(int index=0;index<MAX_KEY;index++){ Zi3T~:0p:  
    if(hCallWnd[index]==NULL) ^n71'MW  
     continue; <UAP~RH{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) QE6El'S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :C}Hy  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 yam}x*O\xn  
   } _> Ln@  
  } {jG.=}/Dk  
 } /d]~ly @uI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); # `58F.  
} "8_,tYAH  
GXEcpc08  
  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: 4@))OD^x  
K!7q!%Ju  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z%;)@0~f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )BlJ|M  
*zSxG[s  
  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: . z].:$J&  
\CtQ*[FmN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,7I},sZj   
{ ioWJj.%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) NE[y|/  
 { 0&B:\  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 YME[%c2x  
  SaveBmp(); RK;;b~  
  return FALSE; %6Rp,M9=  
 } -=>U =|  
 …… //其它处理及默认处理 () <`t}FQ  
} p Dm K  
l<n5gfJ  
6ZTaQPtm  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Zr9d&|$  
W1<.OO\J  
  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。 %2zas(b9j  
(qj,GmcS  
  二、编程步骤 Dx0O'uwR  
- &NQ\W  
  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"; 86#-q7aX  
'FqEB]gu  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; km}MqBQl  
A~XOK;sB  
  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; >.LgsMRIKi  
"kU>~~y,  
  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; ~r PYJ  
jF4csO=E  
  5、 添加代码,编译运行程序。 Vl4Z_viNH  
?^Pq/VtZ  
三、程序代码 KZW'O b>[  
j;G[%gi6{  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL L2d:.&5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) @$EjD3Z-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 99a \MH`^  
#if _MSC_VER > 1000 DQMPAj.  
#pragma once O%prD}x  
#endif // _MSC_VER > 1000 NA=#> f+U%  
#ifndef __AFXWIN_H__ 7Zo&+  
#error include 'stdafx.h' before including this file for PCH PE|PwqX  
#endif zw,-.fmM#  
#include "resource.h" // main symbols Pu-p7:99;'  
class CHookApp : public CWinApp RP(a,D|  
{ Hw y5G ;  
 public: JxnuGkE0[#  
  CHookApp(); prwC>LE  
  // Overrides P3i^S_  
  // ClassWizard generated virtual function overrides ia_Z\q  
  //{{AFX_VIRTUAL(CHookApp) TbMdQbj}  
 public: .hc|t-7f  
  virtual BOOL InitInstance(); ?Q;kZmQl  
  virtual int ExitInstance(); f.J 9) lfb  
  //}}AFX_VIRTUAL pFEZDf}:  
  //{{AFX_MSG(CHookApp) \WiqN*ZF  
  // NOTE - the ClassWizard will add and remove member functions here. ' *}^@[&  
  // DO NOT EDIT what you see in these blocks of generated code ! M5F(<,n;  
  //}}AFX_MSG gA{'Q\  
  DECLARE_MESSAGE_MAP() }'DC Q  
}; C`3V=BB  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); LSSW.Oz2L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %V31B\]Nz7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); r?>Vx -  
BOOL InitHotkey(); Ut]2`8-  
BOOL UnInit(); 6zv;lx0<D&  
#endif eN2dy-0  
G l_\Vy  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. A*a7\id!y  
#include "stdafx.h" FOeVRq:#  
#include "hook.h" "Wo.8  
#include <windowsx.h> n>br,bQe  
#ifdef _DEBUG xC[~Fyhp  
#define new DEBUG_NEW 0r0c|*[+4z  
#undef THIS_FILE KS b(R/T  
static char THIS_FILE[] = __FILE__; UlnyTz~  
#endif i3D<`\;r  
#define MAX_KEY 100 l<W*/}3  
#define CTRLBIT 0x04 *X~B-a|nJ  
#define ALTBIT 0x02 PEfE'lGj  
#define SHIFTBIT 0x01 ^p$1D  
#pragma data_seg("shareddata") L{Q4=p,A  
HHOOK hHook =NULL; pF|8OB%  
UINT nHookCount =0; Ze#Jhn@  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Ir!2^:]!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ] xb]8]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey $p jf#P8U  
static int KeyCount =0; TH<fbd  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift m dC`W&r  
#pragma data_seg() iD.0J/  
HINSTANCE hins; XO0>t{G  
void VerifyWindow(); z<n"{%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) V_Xy2<V  
//{{AFX_MSG_MAP(CHookApp) oDz*~{BHg  
// NOTE - the ClassWizard will add and remove mapping macros here. o>0O@NE  
// DO NOT EDIT what you see in these blocks of generated code! nrF%wH/5  
//}}AFX_MSG_MAP T_uNF8Bh  
END_MESSAGE_MAP() r|l53I 5  
8n;kK?  
CHookApp::CHookApp() 2dXU0095  
{ ^I@ey*$  
 // TODO: add construction code here, ]Mn&76 fu  
 // Place all significant initialization in InitInstance ~l(G6/R  
} |^Y*~d<H  
3aEt>x  
CHookApp theApp; v>rqOI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *4-r`k|@>/  
{ sP9^ IP  
 BOOL bProcessed=FALSE; 7X(rLd 6#  
 if(HC_ACTION==nCode) #D= tX  
 { P\,F1N_?r  
  if((lParam&0xc0000000)==0xc0000000){// Key up v$[ @]`  
   switch(wParam) y=-{Q  
   { A(q~{  
    case VK_MENU: =*{ K@p_  
     MaskBits&=~ALTBIT; B"7$!Co  
     break; BHF{-z  
    case VK_CONTROL: 2^cAK t6bC  
     MaskBits&=~CTRLBIT; W8Ke1( ws&  
     break; #D/$6ah~m  
    case VK_SHIFT: 's=Q.s  
     MaskBits&=~SHIFTBIT; -" 2<h:#  
     break; v;K{|zUdB  
    default: //judge the key and send message Y*`:M(  
     break; nsZDZ/jx  
   } %|# P&`  
   for(int index=0;index<MAX_KEY;index++){ P=f<#l"v  
    if(hCallWnd[index]==NULL) F"-S~I7'L  
     continue; L v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'Y hA  
    { G A'*58  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h |s*i  
     bProcessed=TRUE; R'vdk<  
    } 0\V\qAk  
   } DfAiL(  
  } )o05Vda  
  else if((lParam&0xc000ffff)==1){ //Key down (xucZ  
   switch(wParam) &W&7bZ$;  
   { K.:6YXVs<  
    case VK_MENU: ;[?J5X,  
     MaskBits|=ALTBIT; TjKzBAX  
     break; [P.@1mV  
    case VK_CONTROL: F(T=WR].o  
     MaskBits|=CTRLBIT; db{NK wpj'  
     break; $~ pr+Ei  
    case VK_SHIFT: `Mo~EHso.  
     MaskBits|=SHIFTBIT; F?}m8ZRv  
     break; j09mI$2y67  
    default: //judge the key and send message 5Z^$`$/.v#  
     break; 6&g!ZE'G  
   } mJwv&E  
   for(int index=0;index<MAX_KEY;index++) #B}BI8o (  
   { p +u{W"I`  
    if(hCallWnd[index]==NULL) vN{vJlpY  
     continue; ] +}:VaeA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I'KR'1z 9  
    { R=2 gtW"r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +}Qv6s#  
     bProcessed=TRUE; E`oSi ez)  
    } ZkJY.H-F  
   } $-C6pZN(X  
  } i;E9Za W  
  if(!bProcessed){ B ]|5?QP-  
   for(int index=0;index<MAX_KEY;index++){ ;y:#S^|?-z  
    if(hCallWnd[index]==NULL) d/0/$Bz}P  
     continue; /.pa ??u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) b|X>3(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3&.TU5]`-  
   } FiV^n6-F`  
  } 6LSPPMM  
 } \_iH4<#>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2jI4V;H8g  
} 5O;/ lX!u  
[i,5>YIk  
BOOL InitHotkey() yrxx+z|wR  
{ 0hH Iz4(  
 if(hHook!=NULL){ m _t(rn~f6  
  nHookCount++; |_Naun=+~  
  return TRUE; o'x_g^ Y  
 } >i><s>=I`  
 else "wc`fg"3  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +^^S'mP8  
  if(hHook!=NULL) b&hF')_UOz  
   nHookCount++; UiGUaBmF*  
  return (hHook!=NULL); ~G|{q VO7A  
} b?+ Yo>yF8  
BOOL UnInit() w]]x[D]L  
{ sqq/b9 uL/  
 if(nHookCount>1){ &(z8GYBr  
  nHookCount--; x9XGCr  
  return TRUE; hq|j C  
 } j8D$/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); @F""wKnV  
 if(unhooked==TRUE){ puf;"c6e'  
  nHookCount=0; )_x8?:lv  
  hHook=NULL; @&am!+z  
 } aT`02X   
 return unhooked; dpc=yXg>"c  
} Gaw,1Ow!`2  
2uI`$A:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ie$fMBIq  
{ ;X9MA=b  
 BOOL bAdded=FALSE; MJ*oeI!.=  
 for(int index=0;index<MAX_KEY;index++){ n@ yd{Rc  
  if(hCallWnd[index]==0){ 'vf,T4uQ"  
   hCallWnd[index]=hWnd; ,M+h9_&0?  
   HotKey[index]=cKey; S7\|/h:4  
   HotKeyMask[index]=cMask; nU">> 1!U  
   bAdded=TRUE; d-A%ZAkE]  
   KeyCount++; AW{/k'%xw  
   break; `Tm8TZd66  
  } tyG nG0GK  
 } ^{6UAT~!R  
 return bAdded; l*m]2"n]  
} ]aL  [  
#!<+:y'S?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %r}KvJgd  
{ +Qb2LR  
 BOOL bRemoved=FALSE; ]UpHD.Of[t  
 for(int index=0;index<MAX_KEY;index++){ r*  
  if(hCallWnd[index]==hWnd){ R - ?0k:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %_i0go,^  
    hCallWnd[index]=NULL; hQW#a]]V:  
    HotKey[index]=0; $[^ KCNB  
    HotKeyMask[index]=0; =t>`< T|(  
    bRemoved=TRUE; ZRVF{D??"%  
    KeyCount--; R!M|k%(  
    break; &bOodkOb  
   } +kdU%Sm  
  } Ff1M~MhG  
 } 8Vg`;_-  
 return bRemoved; OU Yb-  
} ggYIq*4  
T_;G))q'  
void VerifyWindow() DrVbx  
{ F4aJr%!\6S  
 for(int i=0;i<MAX_KEY;i++){ Liz 6ob  
  if(hCallWnd!=NULL){ 8xGkh?%  
   if(!IsWindow(hCallWnd)){ P[|B WNei  
    hCallWnd=NULL; 9iN!hy[  
    HotKey=0; jy)9EU=  
    HotKeyMask=0; hTNYjXj  
    KeyCount--; 7UEy L }N  
   } @_ tA"E  
  } D4x'  
 } |SJ% _#=i  
} A_4\$NZ^  
ph$&f0A6Xc  
BOOL CHookApp::InitInstance() (x*2BEn|  
{ 1>O0Iu  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); rj`.hXO  
 hins=AfxGetInstanceHandle(); uJAB)ti2I  
 InitHotkey(); G%x,t -  
 return CWinApp::InitInstance(); ,~68~_)  
}   !AD,  
x:D<Mu#  
int CHookApp::ExitInstance() `&&6-/  
{ W3{5Do.h  
 VerifyWindow(); oR%E_g?mI~  
 UnInit(); )F9%^a(  
 return CWinApp::ExitInstance(); mrB hvp""  
} a0v1LT6  
R/KWl^oNj  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file I$P7%}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t)kr/Z*p\  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JeSkNs|vB  
#if _MSC_VER > 1000 5;KT-(q~  
#pragma once ;lPhSkD  
#endif // _MSC_VER > 1000 "r `6c0Z  
p44uozbK  
class CCaptureDlg : public CDialog c=c.p i"s  
{ OKNs ( H  
 // Construction oz5lt4  
 public: !*QA;*e  
  BOOL bTray; ;U:o'9^9T  
  BOOL bRegistered; zYl+BM-j,6  
  BOOL RegisterHotkey(); +Y%I0.?&5  
  UCHAR cKey; 1oVDOo  
  UCHAR cMask; uC$4TnoQx.  
  void DeleteIcon(); {&AT}7  
  void AddIcon(); XS~w_J#q  
  UINT nCount; ?9.?w-Q'  
  void SaveBmp(); 5<'Jd3N{&  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor u*YuU%H=  
  // Dialog Data L bK1CGyA  
  //{{AFX_DATA(CCaptureDlg) K {N;k-  
  enum { IDD = IDD_CAPTURE_DIALOG }; hQRc,d6x5  
  CComboBox m_Key; T)?@E/VaS  
  BOOL m_bControl; Y&:\s8C  
  BOOL m_bAlt; <zWQ[^  
  BOOL m_bShift; Bf}0'MK8zQ  
  CString m_Path; r -DD*'R  
  CString m_Number; 4xC6#:8  
  //}}AFX_DATA j1C0LP8  
  // ClassWizard generated virtual function overrides g&20F`.N*>  
  //{{AFX_VIRTUAL(CCaptureDlg) ~#xs `@{s  
 public: ^K@ GK  
  virtual BOOL PreTranslateMessage(MSG* pMsg); R5YtCw]i=  
 protected: Q0cf]  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support xuC6EK+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); G`<1>%" F  
  //}}AFX_VIRTUAL \>CBam8d  
  // Implementation wB 0WR  
 protected: rEyMSLN  
  HICON m_hIcon; W2V@\  
  // Generated message map functions ,DsT:8  
  //{{AFX_MSG(CCaptureDlg) t jBv{  
  virtual BOOL OnInitDialog(); e}@J?tJK.L  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); h-u*~5dB<&  
  afx_msg void OnPaint(); <L[)P{jn?p  
  afx_msg HCURSOR OnQueryDragIcon(); H  "/e%  
  virtual void OnCancel(); w@D@,q'x  
  afx_msg void OnAbout(); +hYmL Sq  
  afx_msg void OnBrowse(); '3 ,JL!  
  afx_msg void OnChange(); -cS4B//IK8  
 //}}AFX_MSG `>HthK  
 DECLARE_MESSAGE_MAP() Wa<NId  
}; t"m`P1  
#endif Z-=7QK.\{  
&]A1 _dy  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %x)U8  
#include "stdafx.h" +mel0ZStS  
#include "Capture.h" Lgw@y!Llij  
#include "CaptureDlg.h" kxiyF$ 9  
#include <windowsx.h> (W6\%H2u  
#pragma comment(lib,"hook.lib") m^&mCo,  
#ifdef _DEBUG *^m.V=  
#define new DEBUG_NEW Gf$>!zXr  
#undef THIS_FILE ojI"<Q~g  
static char THIS_FILE[] = __FILE__; yD'h5)yu  
#endif &~6O;}\  
#define IDM_SHELL WM_USER+1 E&=?\KM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y")>"8H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); iONql7S @  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  y3$\ m  
class CAboutDlg : public CDialog ZI*A0_;L  
{  Z~:lfCK`  
 public: lP &%5y;  
  CAboutDlg(); O[J+dWyp  
  // Dialog Data Kct +QO(  
  //{{AFX_DATA(CAboutDlg) d:ajD  
  enum { IDD = IDD_ABOUTBOX }; W_lNvzag  
  //}}AFX_DATA  o=5uM  
  // ClassWizard generated virtual function overrides w6Ny>(T/  
  //{{AFX_VIRTUAL(CAboutDlg) 0L-g'^nn  
 protected: (3S/"ZE  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VZl0)YLK  
  //}}AFX_VIRTUAL / S^m!{  
  // Implementation J*k=|+[  
 protected: JVYYwA^ .  
  //{{AFX_MSG(CAboutDlg) B_1u<00kg  
  //}}AFX_MSG 0pG(+fN_9  
  DECLARE_MESSAGE_MAP() Z@Z`8M@Q,  
}; ,S K6*tpI  
BNUf0;  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lJ2/xE]  
{ S;kc{?   
 //{{AFX_DATA_INIT(CAboutDlg) h(K4AiGE  
 //}}AFX_DATA_INIT %5w)}|fw  
} DEuW'.o>  
!KW)*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) z{_Vn(Kg   
{  Ue Tp,  
 CDialog::DoDataExchange(pDX); ? =Qg  
 //{{AFX_DATA_MAP(CAboutDlg) clV/i&]Qa  
 //}}AFX_DATA_MAP %Q01EjRes  
} vK/Z9wR*05  
WWz ns[$f  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) oMf h|B  
 //{{AFX_MSG_MAP(CAboutDlg) )^xmy6k  
 // No message handlers 1a4$. {  
 //}}AFX_MSG_MAP !0_Y@>2  
END_MESSAGE_MAP() k!rz8S"  
JB}h }nb  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Wx`IEPsVbk  
: CDialog(CCaptureDlg::IDD, pParent) p =O1aM  
{ NX/)Z&Fx:  
 //{{AFX_DATA_INIT(CCaptureDlg) }e|]G,NZO  
  m_bControl = FALSE; ` &DiM@Sm  
  m_bAlt = FALSE; ;f*xOdi*k  
  m_bShift = FALSE; ~|]\. ^B  
  m_Path = _T("c:\\"); w N.Jyb  
  m_Number = _T("0 picture captured."); Ee| y[y,  
  nCount=0; 1z!Lk*C)  
  bRegistered=FALSE; %8}w!2D S  
  bTray=FALSE; <FLc0s  
 //}}AFX_DATA_INIT ~)(Dm+vZ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 q|\Cp  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); [X\2U4  
} b&&'b )  
w%na n=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) s_Gp +-  
{ 6YbSzx` ?k  
 CDialog::DoDataExchange(pDX); I>|?B( F  
 //{{AFX_DATA_MAP(CCaptureDlg) j(N9%/4u  
  DDX_Control(pDX, IDC_KEY, m_Key); 81 C?U5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ]C^*C|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); yIP IA%dJ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 6FAP *V;  
  DDX_Text(pDX, IDC_PATH, m_Path); /zAx`H  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \|s/_35(  
 //}}AFX_DATA_MAP :a`m9s 4  
} HRh".!lxy  
o$;x[US  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6jA Q  
//{{AFX_MSG_MAP(CCaptureDlg) WR%iUO40  
 ON_WM_SYSCOMMAND() |'#NDFI>}  
 ON_WM_PAINT() -JkO[ IF  
 ON_WM_QUERYDRAGICON() 0}!lN{m?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *?\Nioii  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) <#Dc(VhT  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ppS`zqq $  
//}}AFX_MSG_MAP J(GLPCO$K  
END_MESSAGE_MAP() l1-FL-1  
MR: {Ps&,  
BOOL CCaptureDlg::OnInitDialog() C5?M/xj  
{ Nq3P?I(<  
 CDialog::OnInitDialog(); 6=D;K.!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 3._fbAN%e  
 ASSERT(IDM_ABOUTBOX < 0xF000); igCtq!.a  
 CMenu* pSysMenu = GetSystemMenu(FALSE); h[?28q$  
 if (pSysMenu != NULL) +/'jX?7x%  
 { +g&W423k_  
  CString strAboutMenu; jHzb,&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); wq#3f#3V  
  if (!strAboutMenu.IsEmpty()) 9 R1]2U$|  
  { ^~$ o-IX  
   pSysMenu->AppendMenu(MF_SEPARATOR); L|Iq#QX|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); d)HK9T|B  
  } FB`HwE<  
 } wXnt3)e  
 SetIcon(m_hIcon, TRUE); // Set big icon ^W*/!q7H  
 SetIcon(m_hIcon, FALSE); // Set small icon N:.bnF(  
 m_Key.SetCurSel(0); 9yPB)&"EF  
 RegisterHotkey(); =T`-h"E~@  
 CMenu* pMenu=GetSystemMenu(FALSE); * bK@A2`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,# 6\:i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /zM7G?y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); <R$|J|  
 return TRUE; // return TRUE unless you set the focus to a control >F v8 -  
} AseY.0  
!ywc).]e  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #SmWF|/  
{ |SmN.*&(9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) U;/ )V  
 { @AFLFX]  
  CAboutDlg dlgAbout; J^T66}r[f,  
  dlgAbout.DoModal(); ub&1L_K  
 } L $~Id  
 else lHU$A;  
 { YDwns  
  CDialog::OnSysCommand(nID, lParam); +gkB  
 } g`1i[Iu2  
} p%_TbH3j`  
AKVmUS;70  
void CCaptureDlg::OnPaint() SF7Kb`>Y  
{ 622).N4  
 if (IsIconic()) pWqahrWh  
 { SzDi= lY  
  CPaintDC dc(this); // device context for painting *SZ<ori  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); J.*=7zmw  
  // Center icon in client rectangle w~`P\i@  
  int cxIcon = GetSystemMetrics(SM_CXICON); x0] *'^aA  
  int cyIcon = GetSystemMetrics(SM_CYICON); Wil +"[Ge  
  CRect rect; 2=  _.K(  
  GetClientRect(&rect); v3B ^d}+.  
  int x = (rect.Width() - cxIcon + 1) / 2; h?b{{  
  int y = (rect.Height() - cyIcon + 1) / 2; 9b0Z Ey{  
  // Draw the icon NZ#z{JI =+  
  dc.DrawIcon(x, y, m_hIcon); e)M1$  
 } MD,-<X)Qy  
 else `^/Q"zH  
 { sYL+;(#t  
  CDialog::OnPaint(); =J,:j[D(  
 } z'm;H{xf  
} MB)xL-jO  
2WoB;=  
HCURSOR CCaptureDlg::OnQueryDragIcon() '"&?u8u)  
{ A8?>V%b[Y  
 return (HCURSOR) m_hIcon; [": x  
} 3 f3?%9  
Y 4U $?%j  
void CCaptureDlg::OnCancel() AQ&;y&+QR  
{ Pz?O_@Ln  
 if(bTray)  :JlJB  
  DeleteIcon(); eNNK;xXe#  
  CDialog::OnCancel(); z K&`&("4C  
} Je/R'QP^8  
Y<B| e91C  
void CCaptureDlg::OnAbout() ^l9S5 {  
{ <MYD`,$yu  
 CAboutDlg dlg; h(9K7  
 dlg.DoModal(); \<5xf<{  
} !@Ox%vK  
T|u)5ww%  
void CCaptureDlg::OnBrowse() {0|^F!1z  
{ gP} M\3-O  
 CString str; p(v.sP4w  
 BROWSEINFO bi; Dbgw )n*2  
 char name[MAX_PATH]; B>R6j}rh'k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); uW]n3)7<I  
 bi.hwndOwner=GetSafeHwnd(); a^22H  
 bi.pszDisplayName=name; -6? 5|\  
 bi.lpszTitle="Select folder"; @c/~qP4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; pCq{F*;  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )XD_Yq@E  
 if(idl==NULL) $V[ob   
  return; 76 y}1aa  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); M8h9i2  
 str.ReleaseBuffer(); c9Cp!.#*E  
 m_Path=str; &0 @2JS/!  
 if(str.GetAt(str.GetLength()-1)!='\\') I*X| pRD  
  m_Path+="\\"; +2vcUy  
 UpdateData(FALSE); H*Yy o ?  
} <_D+'[  
j,~h:MT  
void CCaptureDlg::SaveBmp() H)5]K9D  
{ )T^hyi$  
 CDC dc; `8L7pbS%,Q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); rA9"CN  
 CBitmap bm; |')Z;  
 int Width=GetSystemMetrics(SM_CXSCREEN); z2r{AQ.&  
 int Height=GetSystemMetrics(SM_CYSCREEN); kWgxswl7H  
 bm.CreateCompatibleBitmap(&dc,Width,Height); [j5L}e!T  
 CDC tdc; Uu G;z5  
 tdc.CreateCompatibleDC(&dc); N(D_*% 96  
 CBitmap*pOld=tdc.SelectObject(&bm); G,J$lT X  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); @Fo0uy\ G  
 tdc.SelectObject(pOld); o/Z?/alt4  
 BITMAP btm; O%)w!0  
 bm.GetBitmap(&btm); RJ0w3T]7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; wqw$6"~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5@i/4%S  
 BITMAPINFOHEADER bih; %zWtPxAf  
 bih.biBitCount=btm.bmBitsPixel; rwU[dqBRhc  
 bih.biClrImportant=0;  3o z]  
 bih.biClrUsed=0; (`T:b1  
 bih.biCompression=0; 8tsW^y;S  
 bih.biHeight=btm.bmHeight; F77~156  
 bih.biPlanes=1; <h(tW  
 bih.biSize=sizeof(BITMAPINFOHEADER); K(hqDif*6  
 bih.biSizeImage=size; R#oXQaBJ  
 bih.biWidth=btm.bmWidth; 8NpQ"0X  
 bih.biXPelsPerMeter=0; :=-h'<D  
 bih.biYPelsPerMeter=0; }v`5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); BwbvZfV|  
 static int filecount=0; n]|[|Rf1  
 CString name; w* v%S   
 name.Format("pict%04d.bmp",filecount++); NJ3b Oq  
 name=m_Path+name; (}'0K?  
 BITMAPFILEHEADER bfh; a 6[bF  
 bfh.bfReserved1=bfh.bfReserved2=0; fk=_ Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ucyxvhH^-  
 bfh.bfSize=54+size; 0rF{"HM~  
 bfh.bfOffBits=54; x6m21DWw  
 CFile bf; kYx|`-PA<r  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0nBAO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); NKO5c?ds  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); k5|h8%h8  
  bf.WriteHuge(lpData,size); ]  OR ]  
  bf.Close(); A07FjT5w8  
  nCount++; 9"&HxyOfX  
 } z[l17+v  
 GlobalFreePtr(lpData); ;+cZS=  
 if(nCount==1) w J; y4  
  m_Number.Format("%d picture captured.",nCount); kZfO`BVL  
 else <wa}A!fu  
  m_Number.Format("%d pictures captured.",nCount); iB{O"l@w  
  UpdateData(FALSE); i,,UD  
} nXXyX[c4e  
Y*J,9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,myl9s  
{ EFhe``  
 if(pMsg -> message == WM_KEYDOWN) p,U.5bX  
 { Wo\NX05-?  
  if(pMsg -> wParam == VK_ESCAPE) (C1]R41'  
   return TRUE; D[ny%9 :  
  if(pMsg -> wParam == VK_RETURN) 5ZUqCl(PX)  
   return TRUE; 8 "|')f#  
 } *joM[ML` 6  
 return CDialog::PreTranslateMessage(pMsg); iN<Tn8-YH6  
} a>6!?:Rj  
*SL v$A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5s`NR<|2L  
{ m%ak]rv([  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]QRhTz  
  SaveBmp(); qpFFvZ W  
  return FALSE; >tYptRP  
} A6= Um%T  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ q8`JRmt)H  
 CMenu pop; PO1sVP.S  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 8nW#Q <s  
 CMenu*pMenu=pop.GetSubMenu(0); *o`bBdZ  
 pMenu->SetDefaultItem(ID_EXITICON); Jk 0 ;<2j  
 CPoint pt; ^I@43Jy/  
 GetCursorPos(&pt); [{L4~(uU8  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %3|0_  
 if(id==ID_EXITICON) (Jy7  
  DeleteIcon(); /(5 SJ(a  
 else if(id==ID_EXIT) ?tSFM:9PU  
  OnCancel();  5'Y @c  
 return FALSE; Syo1Dq6z.  
} Bzw~OB{!=J  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xbSix:R=Z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5e6f)[}  
 AddIcon(); skf7Si0z  
 return res; &dH/V-te  
} y>UM~E  
_}8O15B|  
void CCaptureDlg::AddIcon() PH^AT<U:T  
{ !D!Q]M5oU  
 NOTIFYICONDATA data; eE '\h  
 data.cbSize=sizeof(NOTIFYICONDATA); +m^ gj:yL  
 CString tip; QQj)"XJ29  
 tip.LoadString(IDS_ICONTIP); ?v \A&d  
 data.hIcon=GetIcon(0); IR(qjm\V  
 data.hWnd=GetSafeHwnd(); Lp.,:z7  
 strcpy(data.szTip,tip); $<OX\f%  
 data.uCallbackMessage=IDM_SHELL; q]DV49UK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C5c@@ch :  
 data.uID=98; ia?{]!7$  
 Shell_NotifyIcon(NIM_ADD,&data); 4 bw8^  
 ShowWindow(SW_HIDE); !"Jne'f  
 bTray=TRUE; RQ;pAO  
} KC[ql}JP  
oYG9i=lZ  
void CCaptureDlg::DeleteIcon() KY~p>Jmh  
{ TmxhP nJ~  
 NOTIFYICONDATA data; qH1[Bs Ox  
 data.cbSize=sizeof(NOTIFYICONDATA); 4$oNh)+/h  
 data.hWnd=GetSafeHwnd();  olB?"M=H  
 data.uID=98; 5hF iK K7  
 Shell_NotifyIcon(NIM_DELETE,&data); .y\j .p  
 ShowWindow(SW_SHOW); HZX(kYV  
 SetForegroundWindow(); Kc$j<MRtv  
 ShowWindow(SW_SHOWNORMAL); kj{z;5-dl  
 bTray=FALSE; mmE\=i~  
} %}elh79H*  
e$u=>=jV]  
void CCaptureDlg::OnChange() ~oWCTj-  
{ }6*+>?  
 RegisterHotkey(); o$)pJ#";F  
} ]%>7OH'  
fkbHfBp[(A  
BOOL CCaptureDlg::RegisterHotkey() d}2tqPya  
{ P:,'   
 UpdateData(); P MV;A{T  
 UCHAR mask=0; M=:!d$c  
 UCHAR key=0; V3r1|{Z(  
 if(m_bControl) c5C 2xE}T  
  mask|=4; z~fZg6  
 if(m_bAlt) FOV%\=Hl  
  mask|=2; pBl'SQccp  
 if(m_bShift) ,j E'd'$  
  mask|=1; -5B>2K F  
  key=Key_Table[m_Key.GetCurSel()]; oM\b>*  
 if(bRegistered){ N1/)F k-z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); *'[8FZ|dQ  
  bRegistered=FALSE; ?&A)%6` ~  
 } w*#B_6bG  
 cMask=mask; HEh,Cf7`'  
 cKey=key; Se~< Vpo  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Ck.LsL-  
 return bRegistered; rH Y SS0*3  
} %:Mi6 sR|  
T-,T)R`R  
  四、小结 +U9m  
1 1Sflj  
  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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