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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: ]SAGh|+xl  
  Mtl`A'KQ/K  
  一、实现方法 :IX,mDO  
DUSQh+C  
  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: ? o&goiM  
v^J']p  
#pragma data_seg("shareddata") (}5};v  
HHOOK hHook =NULL; //钩子句柄 .HN4xL  
UINT nHookCount =0; //挂接的程序数目  9mW   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 s{OV-H  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ykRd+H-t  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  HzL~B#  
static int KeyCount =0; %ikPz~(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~|[i64V<^  
#pragma data_seg() ![!,i\x  
Q,M,^_  
  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。 r0wAh/J|  
d;,Jf*x\  
  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: _%3p&1ld  
XqU0AbQ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR FJq g,  
cKey,UCHAR cMask) g*Pn_Yo[.  
{ EL%Pv1  
 BOOL bAdded=FALSE; j<QK1d17  
 for(int index=0;index<MAX_KEY;index++){ t%%zuqF`  
  if(hCallWnd[index]==0){ 6-~ZOMlV  
   hCallWnd[index]=hWnd; >7)QdaB  
   HotKey[index]=cKey; rmi&{o:  
   HotKeyMask[index]=cMask; R_9M-RP6*  
   bAdded=TRUE; ] *U+nG  
   KeyCount++; #)m [R5g(  
   break; 62kA(F 0e,  
  } XTA:Y7"O  
 }  #]QS   
 return bAdded; Q8A+\LR~)  
} }+}Cl T  
//删除热键 Ga+Cb2$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sOVpDtZ]LR  
{ @#*{* S8  
 BOOL bRemoved=FALSE; i1X!G|Awfv  
 for(int index=0;index<MAX_KEY;index++){ L8f_^ *,  
  if(hCallWnd[index]==hWnd){ D-D8La?0p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]yQqx*  
    hCallWnd[index]=NULL; tSY4'  
    HotKey[index]=0; Ve qB/Q X  
    HotKeyMask[index]=0; P^ht$)Y  
    bRemoved=TRUE; I]HLWF  
    KeyCount--; nltOX@P-  
    break; U\W$^r,  
   } 1cx%+-  
  } TD-B\ @_  
 } P)LQ=b}V#;  
 return bRemoved; wz@[rMf  
} ?&!!(dWFH  
++UxzUd  
FRL;fF  
  DLL中的钩子函数如下: txm6[Io  
'f0R/6h\3s  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gV$0J?Pr.  
{ Vx:uqzw#  
 BOOL bProcessed=FALSE; mE=Tj%+ x  
 if(HC_ACTION==nCode) 2"k|IHs1  
 { H@1qU|4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 -GCU6U|  
   switch(wParam) cd~QGP_C  
   {  i!fk'Yt%  
    case VK_MENU: {MN6JGb|'  
     MaskBits&=~ALTBIT; aK(e%Ed t"  
     break; xb"e'Zh  
    case VK_CONTROL: QpiDBJCL  
     MaskBits&=~CTRLBIT; Uu@qS  
     break; *NM*   
    case VK_SHIFT: oiM['iDK  
     MaskBits&=~SHIFTBIT; \II^&xSF  
     break; NG RXNh+  
    default: //judge the key and send message FjI1'Ah\  
     break; Y] UoV_  
   } <Fv7JPN%  
   for(int index=0;index<MAX_KEY;index++){ cp"{W-Q{$  
    if(hCallWnd[index]==NULL) *3h_'3yo@  
     continue; VZe'6?#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _{ 2`sL)  
    { kyZZ0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |MN2v[y  
     bProcessed=TRUE; qG2P?DR  
    } _,v>P2)  
   } 9. ,IqnP  
  } 3g56[;Up?  
  else if((lParam&0xc000ffff)==1){ //有键按下 KZ1m 2R}'  
   switch(wParam) *v: .]_;  
   { 6ZwQ/~7H  
    case VK_MENU: nEP3B '+  
     MaskBits|=ALTBIT; bSQj=|h1  
     break; DjiI*HLNR  
    case VK_CONTROL: il"pKQF  
     MaskBits|=CTRLBIT; >) Bv>HM  
     break; 6JeAXj1g+  
    case VK_SHIFT: KU Mk:5 c  
     MaskBits|=SHIFTBIT; 5Q:49S47  
     break; t\PSB  
    default: //judge the key and send message (WP^}V5  
     break; c/=\YeR  
   } n 4co s  
   for(int index=0;index<MAX_KEY;index++){ hQz1zG`z7  
    if(hCallWnd[index]==NULL) =s*4y$%I  
     continue; Q \S Sv;3_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 56u_viZ=8  
    { ~9,Fc6w4`+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); sHV?njZd  
     bProcessed=TRUE; loHMQKy@  
    } 0bD\`Jiv,  
   } Au{b1n  
  } 90-s@a3B-j  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R:ecLbC  
   for(int index=0;index<MAX_KEY;index++){ A;6ew4  
    if(hCallWnd[index]==NULL) )3V1aC  
     continue; XeslOsHh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .eorwj]yb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); l>hvWK[ ?I  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 W^c /l*>v  
   } *.VNyay  
  } 2S4SG\  
 } `Tk~?aY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); -i_XP]b&  
} dB QCr{7  
)c 79&S  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: yMmUOIxk\  
DMSC(Sz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); D'^%Q_;u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b.8T<@a  
YY$Z-u(  
  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: ,Ij/ ^EC}  
??LE0i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9+8N-LZ  
{ b`Jsu!?{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) W59xe&l  
 { *o!#5c  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p;D {?H/  
  SaveBmp(); !/! Fc'A  
  return FALSE; E8wkqZN  
 } L$"pk{'  
 …… //其它处理及默认处理 a] 6d hQ`  
} e? |4O< @  
!CY*SGO  
W'Y(@  
  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。 ~zvZK]JoX  
YUyYVi7clq  
  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。 A6E~GJa  
lS!O(NzqE'  
  二、编程步骤 2^Z"4t4  
nU6UjC|3  
  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"; 8%a ^j\L  
Df]*S  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; oh9L2"  
>7 cDfv"  
  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; E}#&2n8Y  
LWN9 D  
  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; ;E!] /oY<  
YM.  
  5、 添加代码,编译运行程序。 G c ,  
Id>I.e4  
三、程序代码 ; 0M"T[c  
>66 `hZ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 5Q8s{WQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) C}pQFL{B5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_  ;<%th  
#if _MSC_VER > 1000 ~LP5hL  
#pragma once ~at:\h4:  
#endif // _MSC_VER > 1000 T&:~=  
#ifndef __AFXWIN_H__ Um*&S.y  
#error include 'stdafx.h' before including this file for PCH VCIV*5 P  
#endif NQcg}y  
#include "resource.h" // main symbols C0>L<*C  
class CHookApp : public CWinApp 23a:q{R  
{ |1e//*  
 public: Mp[2Auf  
  CHookApp(); e)87 & 7  
  // Overrides : &~LPmJ  
  // ClassWizard generated virtual function overrides $U)nrn i  
  //{{AFX_VIRTUAL(CHookApp) }gE^HH'  
 public: <7gv<N6BQf  
  virtual BOOL InitInstance(); "x0KiIoPk  
  virtual int ExitInstance(); ?N@[R];  
  //}}AFX_VIRTUAL ZG~d<kM&8s  
  //{{AFX_MSG(CHookApp) 9ESV[  
  // NOTE - the ClassWizard will add and remove member functions here. .&8a ;Q?c  
  // DO NOT EDIT what you see in these blocks of generated code ! $ERiBALN:  
  //}}AFX_MSG :oiHf:  
  DECLARE_MESSAGE_MAP() O3#eQs  
}; (rq(y$N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); j6L(U~%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 58eO|c(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9g.5:  
BOOL InitHotkey(); H!l 9a  
BOOL UnInit(); wLvM<p7OX  
#endif IABF_GwF  
CT'#~~QB  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. XK)0Mt\  
#include "stdafx.h" lB8g D  
#include "hook.h" NK:! U  
#include <windowsx.h> gg Nvm  
#ifdef _DEBUG Y n0iu$;n  
#define new DEBUG_NEW :-(qqC:  
#undef THIS_FILE %c8@  
static char THIS_FILE[] = __FILE__; EW+QVu@  
#endif >t%@)]*N  
#define MAX_KEY 100  [ A 7{}  
#define CTRLBIT 0x04 .Sv/0&O  
#define ALTBIT 0x02 @18}'k  
#define SHIFTBIT 0x01 l 3 jlKB  
#pragma data_seg("shareddata") ,3!4 D^  
HHOOK hHook =NULL; Q5sJ|]Bc  
UINT nHookCount =0; yW"[}L h4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey azO7C*_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *55unc  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey n8`WU3&  
static int KeyCount =0; -MFePpUt  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift e_cK#9+  
#pragma data_seg() BKgCuz:y  
HINSTANCE hins; D6C h6i5$  
void VerifyWindow(); I8YCXh  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) .nEiYS|T  
//{{AFX_MSG_MAP(CHookApp)  k)W&ZY  
// NOTE - the ClassWizard will add and remove mapping macros here. Q8.LlE999  
// DO NOT EDIT what you see in these blocks of generated code! k dhwnO  
//}}AFX_MSG_MAP 4Tb"+Y}  
END_MESSAGE_MAP() wti  
>5D;uTy u  
CHookApp::CHookApp() ViG>gMGv  
{ GR_caP  
 // TODO: add construction code here, n9-WZsc1  
 // Place all significant initialization in InitInstance @Y}G,i  
} e0<O6  
nyBT4e  
CHookApp theApp; Zq5~M bldh  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9\0$YY%  
{ yD@eT:lyi  
 BOOL bProcessed=FALSE; 5du xW>D  
 if(HC_ACTION==nCode) fVdu9 l  
 { v2="j  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8# x7q>?  
   switch(wParam) {i}E)Np  
   { k+Z2)j"  
    case VK_MENU: h 9}x6t,  
     MaskBits&=~ALTBIT; ntW1 )H'o  
     break; Pw5[X5.DX  
    case VK_CONTROL: QZ*gR#K]Sz  
     MaskBits&=~CTRLBIT; [ugr<[6  
     break; MV07RjeS  
    case VK_SHIFT: G&"O)$h  
     MaskBits&=~SHIFTBIT; q;7DH4;t  
     break; }]JHY P\  
    default: //judge the key and send message aM(x--UR=  
     break; \xQu*M:!  
   } :T<5Tq*+x  
   for(int index=0;index<MAX_KEY;index++){ h Vui.]  
    if(hCallWnd[index]==NULL) !(Y,2{  
     continue; G.PRPl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ba** S8{/`  
    { :\y' ?d- Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JV_VM{w{K  
     bProcessed=TRUE; f[ia0w5 m  
    }  T;V!>W37  
   } DgY !)cS  
  } |"+Uf w^  
  else if((lParam&0xc000ffff)==1){ //Key down mkl^2V13~  
   switch(wParam) 1I)oT-~  
   { C2\zbC[qm  
    case VK_MENU: A~ _2"  
     MaskBits|=ALTBIT; NB+/S;`  
     break; m(0X_& &?z  
    case VK_CONTROL: !Lw]aHb  
     MaskBits|=CTRLBIT; .8T0OQ4  
     break; |=MhI5gsx  
    case VK_SHIFT: vo%"(!  
     MaskBits|=SHIFTBIT; IDL0!cF  
     break; ml /S|`Drk  
    default: //judge the key and send message %$i}[ U  
     break; U]@?[+I0]  
   } ,]]*}4[r  
   for(int index=0;index<MAX_KEY;index++) 8_"NF%%(n  
   { (OA4H1DL^  
    if(hCallWnd[index]==NULL) U3Z-1G~*r  
     continue; kg\8 (@h]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <Y2$'ETD  
    { 4u"Bll  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =|8hG*D8  
     bProcessed=TRUE; -Tn%O|#K  
    } +T8MQ[(4  
   } O%N.;Ve  
  } 8@RtL,[d  
  if(!bProcessed){ (.VS&Kv#U  
   for(int index=0;index<MAX_KEY;index++){ ou- uZ"$,c  
    if(hCallWnd[index]==NULL) SvrUXf  
     continue; e `OQ6|.k8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) tw&v@HUP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5$+ssR_?k  
   } F\|4zM  
  } =%7s0l3z  
 } P{yb%@I~J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <HzL%DX  
} N"suR}9%  
'2ZvK  
BOOL InitHotkey() i'4.w?OZ  
{ JodD6 ;P  
 if(hHook!=NULL){ Ks@c wY  
  nHookCount++; s~9n13z  
  return TRUE; QR_h#N2h  
 } 1j:aGj>{  
 else VCJOWU EO1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); }lT;?|n:h  
  if(hHook!=NULL)  ?r@^9  
   nHookCount++; Gh@~~\  
  return (hHook!=NULL); i];P!Gm  
} @BF1X.4-+  
BOOL UnInit() j<k6z   
{ |"I)1[7  
 if(nHookCount>1){ yMTO5~U{  
  nHookCount--; `48Ql  
  return TRUE; [[zN Aq)"  
 } _SJ:|I  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .Y"F3 R  
 if(unhooked==TRUE){ ,isjiy J  
  nHookCount=0; z|X6\8f  
  hHook=NULL; \"Y,1in#  
 } RjVmHhX  
 return unhooked; |_>^vW1f  
} q=V'pML  
x!\q69ndv  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q2uV/M1?  
{ 5j6`W?|q  
 BOOL bAdded=FALSE; ~!!| #A)W  
 for(int index=0;index<MAX_KEY;index++){ |ns?c0rM  
  if(hCallWnd[index]==0){ )>S,#_e*b  
   hCallWnd[index]=hWnd; %W)pZN}  
   HotKey[index]=cKey; $(Mz@#%  
   HotKeyMask[index]=cMask; 7.6L1srV  
   bAdded=TRUE; 7B (%2  
   KeyCount++; x +pf@?w  
   break; 2\QsF,@`YU  
  } 9 fYNSr  
 } \7"|'fz  
 return bAdded; qc 5[ e  
} #j=yQrJ  
G{E`5KIvm  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) v{fcQb  
{ ii-AE L  
 BOOL bRemoved=FALSE; >3Q|k{97  
 for(int index=0;index<MAX_KEY;index++){ y!.jpF'uI  
  if(hCallWnd[index]==hWnd){ \r[u>7I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IT&,?u%  
    hCallWnd[index]=NULL; %S}uCqcAK  
    HotKey[index]=0; 6/Xs}[iJ  
    HotKeyMask[index]=0;  1/2cb-V  
    bRemoved=TRUE; ,<r&] eC  
    KeyCount--; UNff &E-  
    break; ~"CGur P  
   } }Mt1C~{(  
  } 7K:V<vX5  
 } HP1QI/*v  
 return bRemoved; (r kg0  
} !W9:)5^X  
`+"(GaZ  
void VerifyWindow() y{>f^S<  
{ ?! 6Itkg  
 for(int i=0;i<MAX_KEY;i++){ 5$D"uAp<V  
  if(hCallWnd!=NULL){ 4]ni-u0*  
   if(!IsWindow(hCallWnd)){ E<[ s+iX  
    hCallWnd=NULL; q1( [mHZ  
    HotKey=0; dkZe.pv$j  
    HotKeyMask=0; )J}v.8   
    KeyCount--; U5OX.0  
   }  pUb1#=  
  } g-~ _gt7  
 } ]myRYb5Z  
} J-5>+E,nZ  
P*O G`%y  
BOOL CHookApp::InitInstance() 0)332}Oh  
{ z qo0P~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [eDrjf3m  
 hins=AfxGetInstanceHandle(); MMs~f*  
 InitHotkey(); .4)oZ  
 return CWinApp::InitInstance(); !S#3mT-  
} 7|DG1p9C  
v{VF>qE P  
int CHookApp::ExitInstance() og5VB  
{ )hXTgUZa  
 VerifyWindow(); Gl1XRNy C  
 UnInit(); Pc`d]*BYi  
 return CWinApp::ExitInstance(); )Y7H@e\1  
} t?4H9~iH  
A51 a/p#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file zVq!M-e  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7v ZD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~Ld5WEp k3  
#if _MSC_VER > 1000 , ~O>8VbF  
#pragma once IMH4GVr"  
#endif // _MSC_VER > 1000 e~N&?^M  
-AdDPWn  
class CCaptureDlg : public CDialog /I=|;FGq  
{ X8$Mzeq  
 // Construction >u&D@7~c  
 public: &*=!B9OBI  
  BOOL bTray; U]=yCEb8p  
  BOOL bRegistered; z'EQdQ)  
  BOOL RegisterHotkey(); d_@ E4i  
  UCHAR cKey;  Sfz1p  
  UCHAR cMask; +[!S[KE  
  void DeleteIcon(); S\g9 @g.  
  void AddIcon(); I'4(Ibl+  
  UINT nCount; ayy\7b  
  void SaveBmp(); OlOOg  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor i/x |c!E  
  // Dialog Data )4L2&e`k)(  
  //{{AFX_DATA(CCaptureDlg) ^ ` y7JXI:  
  enum { IDD = IDD_CAPTURE_DIALOG }; -G~]e6:zD  
  CComboBox m_Key; |Ns4^2  
  BOOL m_bControl; a)QT#.  
  BOOL m_bAlt; 1;ttwF>G7  
  BOOL m_bShift; 9|1msg4  
  CString m_Path; Q)DEcx-|,  
  CString m_Number; ca g5w~Px  
  //}}AFX_DATA Lq2Q:w'  
  // ClassWizard generated virtual function overrides e= IdqkJ%  
  //{{AFX_VIRTUAL(CCaptureDlg) 79v+ze  
 public: SK}sf9gTv  
  virtual BOOL PreTranslateMessage(MSG* pMsg); tOiz tYu  
 protected: .SD-6GVD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .\R9tt}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mWT+15\5r(  
  //}}AFX_VIRTUAL 'x*C#mt  
  // Implementation bY" zK',m  
 protected: $oBs%.Jp  
  HICON m_hIcon; >Ku4Il+36  
  // Generated message map functions :?6HG_9X  
  //{{AFX_MSG(CCaptureDlg) # )y`Zz{h  
  virtual BOOL OnInitDialog(); ,8@<sF B'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); D&%8JL  
  afx_msg void OnPaint(); J:@gmo`M;V  
  afx_msg HCURSOR OnQueryDragIcon(); )D+BvJ Y"  
  virtual void OnCancel(); $ZM'dIk?  
  afx_msg void OnAbout(); #n>U7j9`O  
  afx_msg void OnBrowse(); .G{cx=;  
  afx_msg void OnChange(); =!'9TS  
 //}}AFX_MSG ~T_|?lU`R  
 DECLARE_MESSAGE_MAP() M\R+:O&  
}; IVNH.g'  
#endif r%U6,7d=)  
{r_HcI(h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file r mX*s} B  
#include "stdafx.h" Hd~g\  
#include "Capture.h" /mkT7,]  
#include "CaptureDlg.h" |?T=4~b  
#include <windowsx.h> OcT Wq  
#pragma comment(lib,"hook.lib") uy {O   
#ifdef _DEBUG 46>rvy.r  
#define new DEBUG_NEW zPaubqB  
#undef THIS_FILE CvU$Fsb  
static char THIS_FILE[] = __FILE__; ?Y4 +3`\x  
#endif x%viCkq  
#define IDM_SHELL WM_USER+1 Z/q6Q#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yB UQ!4e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m!FuC=e  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ]Dq6XR  
class CAboutDlg : public CDialog KU|W85ye  
{ b Hr^_ogN  
 public: IuXgxR%  
  CAboutDlg(); c]4X`3]  
  // Dialog Data #X-C~*|>j  
  //{{AFX_DATA(CAboutDlg) dn 6]qW5  
  enum { IDD = IDD_ABOUTBOX }; g *Js4  
  //}}AFX_DATA Cbff:IP  
  // ClassWizard generated virtual function overrides oco,sxT  
  //{{AFX_VIRTUAL(CAboutDlg) z!g$#hmL>  
 protected: \s)MN s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pJHdY)Cz  
  //}}AFX_VIRTUAL UIAazDyC  
  // Implementation vbid>$%  
 protected: XoKgs,y4  
  //{{AFX_MSG(CAboutDlg) qO>UN[Y  
  //}}AFX_MSG Y#F.{ i  
  DECLARE_MESSAGE_MAP() ;M~,S^U  
}; Y_%:%J  
05wkUo:9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) v@\S$qU2  
{ `etw[#~N  
 //{{AFX_DATA_INIT(CAboutDlg) |vs5N2_  
 //}}AFX_DATA_INIT clvg5{^q[  
} ~+\=X`y  
H$I~Vz[\yb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r2RJb6  
{ +f/ I>9G  
 CDialog::DoDataExchange(pDX); b}qfOgd5  
 //{{AFX_DATA_MAP(CAboutDlg) ~J].~^[  
 //}}AFX_DATA_MAP #*iUZo  
} ~0PzRS^o  
>$m<R &  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) VIF43/>(  
 //{{AFX_MSG_MAP(CAboutDlg) U"Gx Xrl  
 // No message handlers p<L7qwOii  
 //}}AFX_MSG_MAP al[^pPKZ  
END_MESSAGE_MAP() H:DR?'yW  
u> {aF{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'yiv.<4  
: CDialog(CCaptureDlg::IDD, pParent) D6VdgU|  
{ SJiQg-+<Uf  
 //{{AFX_DATA_INIT(CCaptureDlg) &wQ;J)13  
  m_bControl = FALSE; edL2ax  
  m_bAlt = FALSE; Ze0qRLuH!  
  m_bShift = FALSE; v2x+_K}J  
  m_Path = _T("c:\\"); }b1G21Dc!  
  m_Number = _T("0 picture captured."); !>9s  
  nCount=0; pT,8E(*l2  
  bRegistered=FALSE; 9nAP%MA`  
  bTray=FALSE; NJBSVC b  
 //}}AFX_DATA_INIT ?'k_K:_  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 n-9xfn0U~#  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); XM\\Imw  
} >w.;A%|N  
(G|!{  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ](JrEg$K  
{ 6_`Bo%  
 CDialog::DoDataExchange(pDX); y(|#!m?@  
 //{{AFX_DATA_MAP(CCaptureDlg) 3q%z  
  DDX_Control(pDX, IDC_KEY, m_Key); =`+D/ W\[Y  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); yr%[IX]R  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .)/ ."V  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); eA& #33  
  DDX_Text(pDX, IDC_PATH, m_Path); F(VVb(\jd  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fw&*;az  
 //}}AFX_DATA_MAP lAnq2j|  
} V*n$$-5 1-  
wNmpUO ?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]gBnzh.  
//{{AFX_MSG_MAP(CCaptureDlg) Ek<Qz5)  
 ON_WM_SYSCOMMAND() v]SxZLa  
 ON_WM_PAINT() )WoH>D  
 ON_WM_QUERYDRAGICON() Z#.d7B"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *EuX7LEu_  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  dfFw6R  
 ON_BN_CLICKED(ID_CHANGE, OnChange) jRg/N_2'2  
//}}AFX_MSG_MAP /l<(i+0  
END_MESSAGE_MAP() N}#Rw2Vl  
JU)^b V_  
BOOL CCaptureDlg::OnInitDialog() LuySa2 ,  
{ s~OcL  5  
 CDialog::OnInitDialog(); ~ky;[  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); KJ+6Y9b1  
 ASSERT(IDM_ABOUTBOX < 0xF000); 6 /<Hx@r (  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 0d+n[Go+S  
 if (pSysMenu != NULL) f&CQn.K"  
 { L-(bw3Yr>  
  CString strAboutMenu; gY7sf1\wX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); EK# 11@0%  
  if (!strAboutMenu.IsEmpty()) Phi5;U!  
  { QD7KE6KP'  
   pSysMenu->AppendMenu(MF_SEPARATOR); =DdPwr 0Op  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Rrh6-]A  
  } 4bk`i*-O  
 } [RXLR#  
 SetIcon(m_hIcon, TRUE); // Set big icon K+)3 LR^  
 SetIcon(m_hIcon, FALSE); // Set small icon 6,5h4[eF*  
 m_Key.SetCurSel(0); o}Grb/LJ  
 RegisterHotkey(); 8y27O  
 CMenu* pMenu=GetSystemMenu(FALSE); 'xta/@Sq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); S TWH2_`  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); kl]V_ 7[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,ciX *F"  
 return TRUE; // return TRUE unless you set the focus to a control ?t%{2a<X  
} s~{rC{9X  
<eXGtD  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bse`Xfg  
{ j4;^5 Dy^  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "73*0'm  
 { jSpj6:@B  
  CAboutDlg dlgAbout; l,J>[Q`<  
  dlgAbout.DoModal(); s?HK2b^;D  
 } =0?5hxMd  
 else lo!pslqsn  
 { [yMSCCswW  
  CDialog::OnSysCommand(nID, lParam); KKsVZ~<6u  
 } ^N^G?{EV/#  
} sUlf4<_zW  
(m'-1wX.  
void CCaptureDlg::OnPaint() #HV5M1mb  
{ H5 z1_O_+  
 if (IsIconic()) X{x(p  
 { ;h1hz^Wq  
  CPaintDC dc(this); // device context for painting Tz)Ku  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |m KohV qr  
  // Center icon in client rectangle LF7 }gQs ^  
  int cxIcon = GetSystemMetrics(SM_CXICON); l :{q I#Q  
  int cyIcon = GetSystemMetrics(SM_CYICON); :m `D   
  CRect rect; t*= nI $  
  GetClientRect(&rect); >c_fUX={  
  int x = (rect.Width() - cxIcon + 1) / 2; oJD]h/fQs  
  int y = (rect.Height() - cyIcon + 1) / 2; /W .s1N  
  // Draw the icon 9}QIqH\p  
  dc.DrawIcon(x, y, m_hIcon); z6)N![ X  
 } UJ,vE}=_{  
 else oaQW~R`_  
 { f+9WGNpw  
  CDialog::OnPaint(); E"'u2jEG^  
 } -Kg.w*\H7/  
} aB6/-T+ u  
f_)#  
HCURSOR CCaptureDlg::OnQueryDragIcon()  el2Wk@*  
{ &?y@`',a0{  
 return (HCURSOR) m_hIcon; Y-bTKSn  
} +ZbNSN=  
VLV]e_D6s  
void CCaptureDlg::OnCancel() y7/4u-_c  
{ JOG- i  
 if(bTray) [;{xiW4V]  
  DeleteIcon(); I=dn]}b#P  
  CDialog::OnCancel(); {d<XDx4`  
} qR aPh:Q'  
yf&_l^!  
void CCaptureDlg::OnAbout() f?:=@35  
{ /ckk qk"  
 CAboutDlg dlg; rGQD+ d  
 dlg.DoModal(); L*4"D4V  
} x%s1)\^A  
F5X9)9S  
void CCaptureDlg::OnBrowse() YZ<z lU  
{ qeFaY74S  
 CString str; M @KQOAzt  
 BROWSEINFO bi; ~D@YLW1z(  
 char name[MAX_PATH]; iDcTO}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); wlP3 XF?  
 bi.hwndOwner=GetSafeHwnd(); o@N[O^Q V  
 bi.pszDisplayName=name; _`p-^ I  
 bi.lpszTitle="Select folder"; C[.Xi  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; f3Zf97i  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Sed 8Q-m  
 if(idl==NULL) Ej)7[  
  return; L{VnsY V  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 4L:O0Ggz}  
 str.ReleaseBuffer(); ~ S<aIk0l  
 m_Path=str; hiibPc?I  
 if(str.GetAt(str.GetLength()-1)!='\\') z2{y<a9;?  
  m_Path+="\\"; mKu,7nMvF  
 UpdateData(FALSE); -BP10-V  
} Ms+ekY)  
OIj.K@Kr  
void CCaptureDlg::SaveBmp() V'#R1x"3  
{ 7k,BE2]"  
 CDC dc; q)9n%- YgP  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %\HE1d5;  
 CBitmap bm; fZpi+I  
 int Width=GetSystemMetrics(SM_CXSCREEN); J:"@S%gy%  
 int Height=GetSystemMetrics(SM_CYSCREEN); <[n:Ij  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 05{}@tW-  
 CDC tdc; =v^#MU{k?  
 tdc.CreateCompatibleDC(&dc); C-S>'\ |8  
 CBitmap*pOld=tdc.SelectObject(&bm); k62s|VeU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); VoYL}67c  
 tdc.SelectObject(pOld); b-/QZvg  
 BITMAP btm; @;Jv/N6@  
 bm.GetBitmap(&btm); WZ>nA[/  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; FRR05%K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); u=Ik&^v Wq  
 BITMAPINFOHEADER bih; ,\iXZ5"R  
 bih.biBitCount=btm.bmBitsPixel; )#z{P[X^  
 bih.biClrImportant=0; 7b08Lo7b  
 bih.biClrUsed=0; ZHjL8Iq  
 bih.biCompression=0; ,9d]-CuP;  
 bih.biHeight=btm.bmHeight; *Sdx:G~gp  
 bih.biPlanes=1; 9,~7,Py}  
 bih.biSize=sizeof(BITMAPINFOHEADER); }wRm ~  
 bih.biSizeImage=size; @gb W:  
 bih.biWidth=btm.bmWidth; w>cqsTq  
 bih.biXPelsPerMeter=0; Wcc4/:`Hu  
 bih.biYPelsPerMeter=0; [uGsF0#e  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); T8Mqu`$r  
 static int filecount=0; c*7|>7C$i  
 CString name; G=[<KtWa  
 name.Format("pict%04d.bmp",filecount++); -a@e28Y  
 name=m_Path+name; 3QBzyJW f  
 BITMAPFILEHEADER bfh; YFS6YA  
 bfh.bfReserved1=bfh.bfReserved2=0; T5|kO:CbHq  
 bfh.bfType=((WORD)('M'<< 8)|'B'); BFw_T3}zn  
 bfh.bfSize=54+size; `1P|<VbZ  
 bfh.bfOffBits=54; $%cHplQz5  
 CFile bf; i,^3aZwJ'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6\I^]\YO  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $adZ|Q\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); B(1-u!pz  
  bf.WriteHuge(lpData,size); @Q,Q"c2  
  bf.Close(); O!nS3%De  
  nCount++; `XH0S`B  
 } Z" ;q w  
 GlobalFreePtr(lpData); G3:!]}  
 if(nCount==1) OFtf)cGE  
  m_Number.Format("%d picture captured.",nCount);  '4{=x]K  
 else U!-Nx9  
  m_Number.Format("%d pictures captured.",nCount); E\DA3lq  
  UpdateData(FALSE); :0B 7lDw  
} )aGSZ1`/  
wHs1ge(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ws9IO ?|&G  
{ ? -:2f#bC  
 if(pMsg -> message == WM_KEYDOWN) XfE9QA[  
 { R+NiIoa  
  if(pMsg -> wParam == VK_ESCAPE) Ws|`E `6O  
   return TRUE; P #! N  
  if(pMsg -> wParam == VK_RETURN) gZ^Qt.6Z  
   return TRUE; QPB,B>Z  
 } ;$&\ :-6A#  
 return CDialog::PreTranslateMessage(pMsg); 2kDY+AN;  
} F4G81^H  
9o5D3 d K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -O\i^?lD;  
{ 8 5ET$YV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ou-UR5  
  SaveBmp(); ?[Y(JO#  
  return FALSE; ciODTq?  
} ko[w#j  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ u*Xp%vNe  
 CMenu pop; & V>rq'~;  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 1}a4AGAp  
 CMenu*pMenu=pop.GetSubMenu(0); ~x8nC%qPvq  
 pMenu->SetDefaultItem(ID_EXITICON); pAatv;Ex  
 CPoint pt;  "&k(lQ4  
 GetCursorPos(&pt); #PD6LO  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); mTI`^e  
 if(id==ID_EXITICON) k2v:F  
  DeleteIcon(); :1UMA@HP  
 else if(id==ID_EXIT) 8lpAe0p(Z  
  OnCancel(); ;_"|#  
 return FALSE; ?nW>' z  
} T#-;>@a}  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9r]|P}yuS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) w1"+HJd  
 AddIcon(); A/<u>cCW  
 return res; =${.*,o  
} Oq.ss!/z  
?p@J7{a  
void CCaptureDlg::AddIcon() `5@F'tKQ  
{ K{ar)_V/  
 NOTIFYICONDATA data; .c-a$39  
 data.cbSize=sizeof(NOTIFYICONDATA); &$/ #"lW,V  
 CString tip; u5A?; a  
 tip.LoadString(IDS_ICONTIP); ;9k>; g3m  
 data.hIcon=GetIcon(0); 9(TGkz(NA  
 data.hWnd=GetSafeHwnd(); IANSpWea?  
 strcpy(data.szTip,tip);  eo9/  
 data.uCallbackMessage=IDM_SHELL; (|^m9v0:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; CfU|]<  
 data.uID=98; _F%`7j  
 Shell_NotifyIcon(NIM_ADD,&data); 4`#Q  
 ShowWindow(SW_HIDE); j-ej7  
 bTray=TRUE; WSHPh hM  
} G@H!D[wd  
GHGyeqNM  
void CCaptureDlg::DeleteIcon() :_R:>n9 p  
{ g.Xk6"kO  
 NOTIFYICONDATA data; qazA,|L!  
 data.cbSize=sizeof(NOTIFYICONDATA); h`|04Q  
 data.hWnd=GetSafeHwnd(); @[3c1B6K  
 data.uID=98; o]oiJvOr  
 Shell_NotifyIcon(NIM_DELETE,&data); <PpvVDy3  
 ShowWindow(SW_SHOW); z l r !   
 SetForegroundWindow(); }9S}?R  
 ShowWindow(SW_SHOWNORMAL); (P)G|2=  
 bTray=FALSE; +%W8Juu  
} ZkbE&7Z  
-)}s{[]d6m  
void CCaptureDlg::OnChange() &j 4pC$Dj  
{ ;>?h/tS6  
 RegisterHotkey(); C27:ty V  
} }sXTZX  
f4f2xe7\Q  
BOOL CCaptureDlg::RegisterHotkey() -@#w)  
{ [%.v;+L  
 UpdateData(); OT{"C"%5t  
 UCHAR mask=0; B3#G  
 UCHAR key=0; A8Ju+  
 if(m_bControl) LCHMh6  
  mask|=4; *|A QV:  
 if(m_bAlt) PE%$g\#?  
  mask|=2; )dT@0Ys%  
 if(m_bShift) ;Q;j@yx  
  mask|=1; 3$\k=q3`#  
  key=Key_Table[m_Key.GetCurSel()]; D4=*yP  
 if(bRegistered){ L^+rsxR  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); [*',pG  
  bRegistered=FALSE; (GSP3KKo*G  
 } i5 rkP`)j  
 cMask=mask; l[}4 X/  
 cKey=key; @?3f`l 9  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); V_+&Y$msi~  
 return bRegistered; E#k{<LYI  
} gF)9a_R%p  
4yl{:!la  
  四、小结 %=aKW[uq]  
Z?axrGmg0  
  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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