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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: f$o^Xu  
  +~^S'6yB  
  一、实现方法 ^PZ[;F40  
1B~O!']N<  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Bu{Kjv  
 =_dM@j  
#pragma data_seg("shareddata") KZppQ0  
HHOOK hHook =NULL; //钩子句柄 *-T.xo  
UINT nHookCount =0; //挂接的程序数目 F0:]@0>r  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 d&#_t@%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +0pI}a\  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey lMFR_g?r  
static int KeyCount =0; cc[(w #K  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 t? GH V3V  
#pragma data_seg() UM7@c7B?  
iq; | i!  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 *)Rm X$v3  
VE )D4RL  
  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: 9-42A7g^C  
X0.H(p#s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1sqE/-v1_^  
cKey,UCHAR cMask) ;I>nA6A  
{ WX&IQ@  
 BOOL bAdded=FALSE; *g(d}C!  
 for(int index=0;index<MAX_KEY;index++){ OIblBQ!  
  if(hCallWnd[index]==0){ v)5;~.+%  
   hCallWnd[index]=hWnd; PIri|ZS  
   HotKey[index]=cKey; S<nF>JRJa  
   HotKeyMask[index]=cMask; rqamBm 5  
   bAdded=TRUE; ,h*gd^i  
   KeyCount++; 7V"?o  
   break;  +A3/^C0  
  } M)bQvjj  
 } V!Wy[u  
 return bAdded; %ih\|jR t  
} qOo4T@ t3  
//删除热键 )CFJ Xc:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W:r[o%B  
{ u[GZ~L  
 BOOL bRemoved=FALSE; E|@C:ghG  
 for(int index=0;index<MAX_KEY;index++){ fd)8lK[KJ"  
  if(hCallWnd[index]==hWnd){ {T4_Xn-I  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OgF[=  
    hCallWnd[index]=NULL; fbq$:Q44  
    HotKey[index]=0; xs"i_se  
    HotKeyMask[index]=0; 'Ea3(OsuXn  
    bRemoved=TRUE; uMcI'=  
    KeyCount--; |;gx;qp4cN  
    break; J n.7W5v  
   } >dAl*T  
  } g257jarkMF  
 } ,P~e)<.  
 return bRemoved; `c Gks  
} "hyfo,r  
# &v4c  
7P{= Pv+  
  DLL中的钩子函数如下: fQoAdw  
iJTG +gx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) b<u\THy#  
{ n_QuuUB  
 BOOL bProcessed=FALSE; ('z=/"(l  
 if(HC_ACTION==nCode) ,cxqr3 o  
 { {Ydhplg{  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~>:JwTy  
   switch(wParam) ZX_QnSNZ?  
   {  a ,mgM&yD  
    case VK_MENU: KMhrw s{&B  
     MaskBits&=~ALTBIT; DI0& _,  
     break; SgU@`Pb  
    case VK_CONTROL: : /5+p>Ep}  
     MaskBits&=~CTRLBIT; ?'V78N sA  
     break; stw@@GQ  
    case VK_SHIFT: Y9abRr K  
     MaskBits&=~SHIFTBIT; QytO0K5  
     break; r]e{~v/  
    default: //judge the key and send message BbB3#/g  
     break; Ijh RSrCv  
   } 2-F7tcya|  
   for(int index=0;index<MAX_KEY;index++){ WyV4p  
    if(hCallWnd[index]==NULL) *JOK8[Qn  
     continue; (Q{JI~P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oIrc))j,$  
    { kHK<~srB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #hBqgG:>  
     bProcessed=TRUE; cC8$oCR?  
    } | 6AR!  
   } /IirTmFK  
  } )QAYjW!Z  
  else if((lParam&0xc000ffff)==1){ //有键按下 k7Nx#%xx  
   switch(wParam) XU'(^Y8Imz  
   { >Iij,J5i  
    case VK_MENU: H;=yR]E  
     MaskBits|=ALTBIT; 8i6iynR  
     break; }%KQrlbHJl  
    case VK_CONTROL: Q}&'1J  
     MaskBits|=CTRLBIT; 9^Xndo]y  
     break; a Mqt2{f+  
    case VK_SHIFT: !KV!Tkx h  
     MaskBits|=SHIFTBIT; 6F^/k,(k4  
     break; Pr>$m{ Z  
    default: //judge the key and send message %\it4 r3  
     break; B~o3Z  
   } .3EEi3z6z  
   for(int index=0;index<MAX_KEY;index++){ |mhKD#:  
    if(hCallWnd[index]==NULL) 0+0 Y$;<  
     continue; pll5m7[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @#wG)TA  
    { -Ua5anzB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ]FR#ZvM>x  
     bProcessed=TRUE; !UzE&CirV  
    } py$Gy-I~[  
   } `y'%dY}$n  
  } 0Y`+L6&UX  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |TJ gH<I  
   for(int index=0;index<MAX_KEY;index++){ #8d#Jw  
    if(hCallWnd[index]==NULL) ufR|V-BWx  
     continue; OBFM70K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "4XjABJ4'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~ &/Nl_#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Fmn_fW6  
   } ?r;F'%N=  
  } Vb 36R _u  
 } o5],c9R9b  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); dhLd2WSyH  
} +46& Zb35  
P'$2%P$8:~  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: #~Kno@  
ruhC:rg:/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qPu?rU{2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `~axOp9N  
B{#Fm6  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: CS%ut-K<5M  
;180ct4  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) uToi4]w"y  
{ k8Dk;N  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) } %3;j5 ;6  
 { o<|u4r={s  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 8U#14U5rS  
  SaveBmp(); NrcV%-+u%  
  return FALSE; 1% @i4  
 } 0>Kgz!I  
 …… //其它处理及默认处理 "<oR.f=0  
}  w&U28"i>  
i39_( )X  
&~"N/o  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 >U:-U"rA?  
%i&am=  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 y]Q/(O  
jp-(n z\  
  二、编程步骤 .Sm 8t$  
x}C$/7^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; *R&77 o7  
T+V:vuK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 98}l`J=i  
MNfc1I_#  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; m=`V  
*{fZA;<R  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ,[n=PJVw/  
7CT446  
  5、 添加代码,编译运行程序。 *E@as  
_=w=!U&W  
三、程序代码 c:DV8'fT  
=+e;BYD#!  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ZA4sEVHW  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) BQMo*I>I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 2$Z4 >!  
#if _MSC_VER > 1000 ,|O|gh$s  
#pragma once Swv =gu  
#endif // _MSC_VER > 1000 ]:6IW:  
#ifndef __AFXWIN_H__ FOa2VP%  
#error include 'stdafx.h' before including this file for PCH ]{-ib:f~  
#endif CwF=@:*d  
#include "resource.h" // main symbols t-FrF</ 0  
class CHookApp : public CWinApp l) Cg?9  
{ mqQ//$Y   
 public: r^d:Po  
  CHookApp(); m]++ !  
  // Overrides cMUmJH  
  // ClassWizard generated virtual function overrides Mc|UD*Z  
  //{{AFX_VIRTUAL(CHookApp) &'5 j!  
 public: 5X`m.lhUc  
  virtual BOOL InitInstance(); b<g9L4s  
  virtual int ExitInstance(); ;>p{|^X0D  
  //}}AFX_VIRTUAL Jpe\  
  //{{AFX_MSG(CHookApp) {Cw>T-`  
  // NOTE - the ClassWizard will add and remove member functions here. e=6C0fr  
  // DO NOT EDIT what you see in these blocks of generated code ! :EC[YAK+D  
  //}}AFX_MSG C It@xi#I  
  DECLARE_MESSAGE_MAP() cj3P]2B#  
}; 7baQ4QY?n  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); q-0( Wx9|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yzCamm4~0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :jWQev"/  
BOOL InitHotkey(); mVyF M -`  
BOOL UnInit(); !uHVg(}  
#endif |P=-m-W  
*Q3q(rdrp  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. _K>YB>W}7  
#include "stdafx.h" (d5kD#.N  
#include "hook.h" fH 5/  
#include <windowsx.h> 6c#1Do(W+  
#ifdef _DEBUG ~p/1 9/  
#define new DEBUG_NEW !vSj1w  
#undef THIS_FILE 9&KiG* .  
static char THIS_FILE[] = __FILE__; _$qH\>se  
#endif &q[`lIV,L  
#define MAX_KEY 100 G Y ]bw  
#define CTRLBIT 0x04 "M:0lUy  
#define ALTBIT 0x02 (^Hpe5h&  
#define SHIFTBIT 0x01 r7:4| 6E  
#pragma data_seg("shareddata") 8DJoQl9  
HHOOK hHook =NULL; 4}HY= 0Um  
UINT nHookCount =0; }W* q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey /4 -6V d"8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z)y{(gR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [Gb8o'  
static int KeyCount =0; [[0u|`T/  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift lxD~[e  
#pragma data_seg() w'D=K_h  
HINSTANCE hins; Zut"P3d=J  
void VerifyWindow(); ~Wj. 4b*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \ssqIRk  
//{{AFX_MSG_MAP(CHookApp) b\Gw|?Rv  
// NOTE - the ClassWizard will add and remove mapping macros here. ?,x3*'-(  
// DO NOT EDIT what you see in these blocks of generated code! nx'D&, VX  
//}}AFX_MSG_MAP t=(CCq_N,  
END_MESSAGE_MAP() 0)-yLfTn  
Sy`7})[  
CHookApp::CHookApp() 3At%TA:  
{ niJtgK:H^  
 // TODO: add construction code here, <-m[0zg q  
 // Place all significant initialization in InitInstance UgZuEfEGve  
} ;V\l, u  
jAb R[QR1%  
CHookApp theApp; q*4=sf,>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pbePxOG  
{ 3]g|Cwu  
 BOOL bProcessed=FALSE; 0T7""^'&  
 if(HC_ACTION==nCode) x\R 8W8M  
 { T4x%dg  
  if((lParam&0xc0000000)==0xc0000000){// Key up $Q< >M B7  
   switch(wParam) Ves x$!F#  
   { 0_faJjTbP;  
    case VK_MENU: V0!$k.Wk  
     MaskBits&=~ALTBIT; uMe]].04  
     break; u' +;/8  
    case VK_CONTROL: f& >[$zh  
     MaskBits&=~CTRLBIT; a$ FO5%o  
     break; Gg=Y}S7:  
    case VK_SHIFT: &;Jg2f%.  
     MaskBits&=~SHIFTBIT; 0'0GAh2  
     break; U0X? ~ 1  
    default: //judge the key and send message [ GqQ6\  
     break; ijR,%qg  
   } (^).$g5Hg  
   for(int index=0;index<MAX_KEY;index++){ a8laP N  
    if(hCallWnd[index]==NULL) -3On^Wj]  
     continue; V*w~Sr%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zBTyRL l  
    { $,9A?'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .8EaFEd  
     bProcessed=TRUE; SV0h'd(b  
    } U^.kp#x#  
   } 2Ub!wee  
  } Xe7/  
  else if((lParam&0xc000ffff)==1){ //Key down Gm2q`ki  
   switch(wParam) TcM;6h`  
   { %DR8M\d1~H  
    case VK_MENU: ic(`Ev  
     MaskBits|=ALTBIT; hY S}PE  
     break; 8\ { 1y:|  
    case VK_CONTROL: yO`HL'SMo  
     MaskBits|=CTRLBIT; {WoS&eL  
     break; 6w Y6* R  
    case VK_SHIFT: -\V!f6Q  
     MaskBits|=SHIFTBIT; 51&K  
     break; tlJ@@v&=  
    default: //judge the key and send message VHihC]ks,  
     break; =AIeYUh  
   } \hr2#!  
   for(int index=0;index<MAX_KEY;index++) qPG>0 O  
   { A, ;V|jv9  
    if(hCallWnd[index]==NULL) /pS Y~*  
     continue; Uop`)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ods/1 KW  
    { VW/ICX~"d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $]t3pAI[H0  
     bProcessed=TRUE; vlS+UFH0  
    } m#.N  
   } g`9`/  
  } |s$w i>7l  
  if(!bProcessed){ 82*nC!P3E  
   for(int index=0;index<MAX_KEY;index++){ ]5Mq^@mD'  
    if(hCallWnd[index]==NULL) X&14;lu%p  
     continue; JRYCM}C]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {\62c;.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g/f^|:  
   } p]E\!/  
  } l1I\khS  
 } _(%;O:i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {GP#/5$=  
} '`nf7b(  
x^]J^L45  
BOOL InitHotkey() ly~tB LH}  
{ ; xx u,  
 if(hHook!=NULL){ !/RL.`!>  
  nHookCount++; J,Rp&tavt:  
  return TRUE; ~,O&A B  
 } Lsb`,:  
 else (29BS(|!  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); thK4@C|X4  
  if(hHook!=NULL) uoi~JF  
   nHookCount++; {&,MkWgG  
  return (hHook!=NULL); RoYwZX~  
} 5|_El/G  
BOOL UnInit() 3EO:Uk5<   
{ &X&msEM  
 if(nHookCount>1){ P?/Mrz   
  nHookCount--; %s* F~E  
  return TRUE;  O3~7  
 } 4RyQ^vL  
 BOOL unhooked = UnhookWindowsHookEx(hHook); /k^!hI"4c  
 if(unhooked==TRUE){ ?w5>Z/V  
  nHookCount=0; y1OpZ  
  hHook=NULL; Q.i_?a  
 } ]gjB%R[.m  
 return unhooked; AXT(D@sI=  
} b;jr;I  
n}L Jt  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i)=dp!Bx^  
{ zr@H Yl  
 BOOL bAdded=FALSE; 0f9*=c  
 for(int index=0;index<MAX_KEY;index++){ g(QT"O!dY  
  if(hCallWnd[index]==0){ dh K<5E  
   hCallWnd[index]=hWnd; P={8qln,X  
   HotKey[index]=cKey; /ei(Q'pc[  
   HotKeyMask[index]=cMask; UiQF4Uc"  
   bAdded=TRUE; qW 2'?B3<  
   KeyCount++; n7VQi+i'  
   break; xua E\*m  
  } 'y%*W:O  
 } V)jF]u~g  
 return bAdded; w42=tN+ B  
} EZJ[+ -Q;  
=O?? W8u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) vM?jm! nd  
{ T )!k J;vc  
 BOOL bRemoved=FALSE; w^E$R  
 for(int index=0;index<MAX_KEY;index++){ @&9, 0 x  
  if(hCallWnd[index]==hWnd){ )QAS7w#k  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ RN"Ur'+  
    hCallWnd[index]=NULL; d^qTY?k.  
    HotKey[index]=0; Ef\&3TcQ  
    HotKeyMask[index]=0; 2g HRfTF  
    bRemoved=TRUE; LO@o`JF  
    KeyCount--; W0k7(v)  
    break; bx:j`5Uj`  
   } FO{?Z%& ;  
  } iq<nuO  
 } c"oJcp  
 return bRemoved; S<81r2LT  
} ]o ($No  
khVfc  
void VerifyWindow() 3XcFBFE  
{ SYA0Hiw7P  
 for(int i=0;i<MAX_KEY;i++){ FJ] ?45  
  if(hCallWnd!=NULL){ B3Daw/G  
   if(!IsWindow(hCallWnd)){ v~:'t\n  
    hCallWnd=NULL; z<OfSS_]R  
    HotKey=0; FZ5 Ad&".@  
    HotKeyMask=0; j7yUya&  
    KeyCount--; TEQs9-Uy  
   } 8fA8@O}  
  } yVt8QF!  
 } P~h 0Ul  
} [ z,6K=  
-cgMf\YF  
BOOL CHookApp::InitInstance() l0lvca=;  
{ g3TqTs  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +Uxt xl'  
 hins=AfxGetInstanceHandle(); an)Z.x  
 InitHotkey(); BHpj_LB-P  
 return CWinApp::InitInstance(); C:p`  
} ~\u~>mtchu  
G8lTIs4u;  
int CHookApp::ExitInstance() <])kO`+G  
{ / mwsF]Y  
 VerifyWindow(); bA07zI2  
 UnInit(); H=6-@+ !o  
 return CWinApp::ExitInstance(); Ygc.0VKMR  
} `=E4J2"  
zKFiCP K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file VLC=>w\,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rTzXRMv@o  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ R<Ct{f!  
#if _MSC_VER > 1000 K_-S`-eH  
#pragma once +T HBPEq  
#endif // _MSC_VER > 1000 X4/3vY  
0}- MWbG  
class CCaptureDlg : public CDialog dC?l%,W  
{ s[%@3bY!7  
 // Construction @wh-.M D  
 public: Lv@'v4.({  
  BOOL bTray; ; g\r Y  
  BOOL bRegistered; LT:8/&\  
  BOOL RegisterHotkey(); 86 W.z6  
  UCHAR cKey; *a'I  
  UCHAR cMask; \N.Bx  
  void DeleteIcon(); =W"9a\m  
  void AddIcon(); e\ ! ic  
  UINT nCount; v dPb-z4  
  void SaveBmp(); J'*`K>wV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor CPJ%<+4%b  
  // Dialog Data bl[2VM7P  
  //{{AFX_DATA(CCaptureDlg) B1o*phM g  
  enum { IDD = IDD_CAPTURE_DIALOG }; Ex5 LhRe>=  
  CComboBox m_Key; P"r7m  
  BOOL m_bControl; ADB,gap  
  BOOL m_bAlt; A5,(P$@ k  
  BOOL m_bShift; ^TAf+C^Ry  
  CString m_Path; ZQ[s/  
  CString m_Number; M+WN\.2pX  
  //}}AFX_DATA % {A%SDh  
  // ClassWizard generated virtual function overrides 8YO` TgW  
  //{{AFX_VIRTUAL(CCaptureDlg) !$#8Z".{v{  
 public: }h=3[pe}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); h 2C9p2.  
 protected: Oo x,4 &  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &+df@U6i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); YRU#/TP  
  //}}AFX_VIRTUAL Gy!bPVe  
  // Implementation Im@Yx^gc   
 protected: MG4(,"c!  
  HICON m_hIcon; -o YJ&r  
  // Generated message map functions D3x W?$Z  
  //{{AFX_MSG(CCaptureDlg) h`:B8+k  
  virtual BOOL OnInitDialog(); 9Qn*frdY,  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); vzZ"TSP  
  afx_msg void OnPaint(); qKNHhXi  
  afx_msg HCURSOR OnQueryDragIcon(); ZvSEa{  
  virtual void OnCancel(); .}3K9.hkr  
  afx_msg void OnAbout(); Q`BB@E  
  afx_msg void OnBrowse(); V(OD^GU  
  afx_msg void OnChange(); i"#zb&~nF  
 //}}AFX_MSG >H,PST  
 DECLARE_MESSAGE_MAP() `,Y/!(:;  
}; TlJ'pG 4^  
#endif 92Rm{n   
V0y_c^x  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file H~?p,h  
#include "stdafx.h" %R?#Y1Tq;  
#include "Capture.h" v.Xmrry  
#include "CaptureDlg.h" )`}4rD^b  
#include <windowsx.h> La\|Bwx  
#pragma comment(lib,"hook.lib") /086qB|  
#ifdef _DEBUG A<{&?_U  
#define new DEBUG_NEW j_}f6d/h  
#undef THIS_FILE $rH}2  
static char THIS_FILE[] = __FILE__; _OJ19Ry  
#endif IvM>z03  
#define IDM_SHELL WM_USER+1 rG{,8*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4?l:.\fB:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U9h@1:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "@rXN"4  
class CAboutDlg : public CDialog y@\J7 h:  
{ 8C<%Y7)/  
 public: "^5%g%  
  CAboutDlg(); EN)0b,ax  
  // Dialog Data r8Z} mvLM  
  //{{AFX_DATA(CAboutDlg) e%KCcU  
  enum { IDD = IDD_ABOUTBOX }; pt~b=+bBm  
  //}}AFX_DATA -{eI6#z|\A  
  // ClassWizard generated virtual function overrides ?xtP\~  
  //{{AFX_VIRTUAL(CAboutDlg) AmBLZ<f;  
 protected: 6='x}Qb\H  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !p(N DQm  
  //}}AFX_VIRTUAL =xM:8 hm  
  // Implementation Hq "l`  
 protected: I=&Kn@^  
  //{{AFX_MSG(CAboutDlg) SaA-Krn  
  //}}AFX_MSG [u7i)fn5?  
  DECLARE_MESSAGE_MAP() dU#} Tk  
};  +D|E8sz8  
6G<gA>V  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8Xz \,}$O  
{ Dh .<&ri   
 //{{AFX_DATA_INIT(CAboutDlg) O8 5)^  
 //}}AFX_DATA_INIT nmUMg  
} <xr\1VjA  
E,7b=t  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @xN)mi  
{ C7_#D O6"  
 CDialog::DoDataExchange(pDX);  $ 1v'CT  
 //{{AFX_DATA_MAP(CAboutDlg) _r vO#h  
 //}}AFX_DATA_MAP e%JH q  
} `r*bG=  
Wh1'?#  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) I=K|1  
 //{{AFX_MSG_MAP(CAboutDlg) 3zo:)N \K  
 // No message handlers F'^?s= QX  
 //}}AFX_MSG_MAP VU \{<j{  
END_MESSAGE_MAP() 1ika'  
7^DN8g"&\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) RV_+-m{]  
: CDialog(CCaptureDlg::IDD, pParent) ;<nQl,2N  
{ n{xL1A=9  
 //{{AFX_DATA_INIT(CCaptureDlg) L] !M1\  
  m_bControl = FALSE; CG[04y  
  m_bAlt = FALSE; nBGcf(BE.$  
  m_bShift = FALSE; P6u%-#  
  m_Path = _T("c:\\"); a,KqTQB  
  m_Number = _T("0 picture captured."); lAo S 9w  
  nCount=0; 3V@!}@y,F6  
  bRegistered=FALSE; &``nYI g/  
  bTray=FALSE; Q a3+9  
 //}}AFX_DATA_INIT 5ii:93Hlj  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #iP5@:!Wm~  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \Qei}5P,  
} ]% I|C++0  
Bngvm9k3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) v?`DP  
{ _BBs{47{E  
 CDialog::DoDataExchange(pDX); ?7R&=B1g  
 //{{AFX_DATA_MAP(CCaptureDlg) 0i/!nke.  
  DDX_Control(pDX, IDC_KEY, m_Key); GbJVw\5Z*  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .?*TU~S  
  DDX_Check(pDX, IDC_ALT, m_bAlt); KN"<f:u  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); )(l=_[1Z5  
  DDX_Text(pDX, IDC_PATH, m_Path); vlh$NK+F  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,_RPy2N  
 //}}AFX_DATA_MAP K)9+3(?  
} d^^EfWU  
m$B)_WW  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) C vWt  
//{{AFX_MSG_MAP(CCaptureDlg) \Ea(f**2B  
 ON_WM_SYSCOMMAND() E  *{_=pX  
 ON_WM_PAINT() FP9FE `x  
 ON_WM_QUERYDRAGICON() D~7L~Q]xI  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 8&UwnEk<  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ($[)Tcq*~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) y\c-I!6>26  
//}}AFX_MSG_MAP @]X5g8h  
END_MESSAGE_MAP() #qg(DgH 7  
n+:}p D  
BOOL CCaptureDlg::OnInitDialog() *#Hw6N0#   
{ Vl%jpjqP  
 CDialog::OnInitDialog(); ?qR11A};tG  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); OmAa$L,'w  
 ASSERT(IDM_ABOUTBOX < 0xF000); ;'4 HR+E"  
 CMenu* pSysMenu = GetSystemMenu(FALSE); sL\W6ej  
 if (pSysMenu != NULL) .yb=I6D;<3  
 { uZ8^"  W  
  CString strAboutMenu; zM!2JC  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 6;#Rd|  
  if (!strAboutMenu.IsEmpty()) Z$:iq  
  { *{s 3.=P.  
   pSysMenu->AppendMenu(MF_SEPARATOR); .fD%*-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); gkL{]*9&%  
  } j=n<s</V  
 } aF%V  
 SetIcon(m_hIcon, TRUE); // Set big icon iBaz1pDc  
 SetIcon(m_hIcon, FALSE); // Set small icon EN{o3@ O'  
 m_Key.SetCurSel(0); ,'>O#kD  
 RegisterHotkey(); )jHH-=JM  
 CMenu* pMenu=GetSystemMenu(FALSE); @szr '&\%A  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); :XeRc"m<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1 JB~G7  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ZOY zCc(d  
 return TRUE; // return TRUE unless you set the focus to a control iuS*Vw  
} T7~Vk2o%(  
y$U(oIU>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) J3,m{%EtNM  
{ *g!7PzJ'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Qs7*_=+h  
 { Rxk0^d:sNi  
  CAboutDlg dlgAbout; 98LyzF9  
  dlgAbout.DoModal(); 0t(js_  
 } <_~e/+_.  
 else !FHm.E_>  
 { sG8G}f  
  CDialog::OnSysCommand(nID, lParam); se&Q\!&M  
 } (.N!(;G  
} 8KHT"uc'*J  
-8m3L  
void CCaptureDlg::OnPaint() -&JQdrs  
{ j6DI$tV~  
 if (IsIconic()) IHcR/\mz  
 { >m# bj^F\  
  CPaintDC dc(this); // device context for painting gt)wk93d>  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $ uqB.f$  
  // Center icon in client rectangle eq,`T;  
  int cxIcon = GetSystemMetrics(SM_CXICON); pgEDh^[MW  
  int cyIcon = GetSystemMetrics(SM_CYICON); vk.P| Y-;  
  CRect rect; 2i)vT)~  
  GetClientRect(&rect); olca Z  
  int x = (rect.Width() - cxIcon + 1) / 2; 2+cpNk$  
  int y = (rect.Height() - cyIcon + 1) / 2; osZ] R  
  // Draw the icon 5Sx.'o$  
  dc.DrawIcon(x, y, m_hIcon); ,WtJ&S7?  
 } e]-%P(}Z  
 else ]oxi~TwY^  
 { <P.'r,"[  
  CDialog::OnPaint(); hD9b2KZv  
 } 3H ,?ZFFGz  
} Er@OmNT  
6 U_P  
HCURSOR CCaptureDlg::OnQueryDragIcon() *=zv:!  
{ e"&QQ-q  
 return (HCURSOR) m_hIcon; jH?!\F2)+  
} RJOW#e :  
a9y+FCA  
void CCaptureDlg::OnCancel() }va>jfy  
{ 5]~4 51  
 if(bTray) BV=~ !tsl  
  DeleteIcon(); =Hx]K8N)  
  CDialog::OnCancel(); OZ, Xu&N  
} qB5.of[N!  
20cEE>  
void CCaptureDlg::OnAbout() 4Be\5Byr  
{ 2B"&WKk  
 CAboutDlg dlg; hO; XJyv  
 dlg.DoModal(); ~|( eh9  
} Cf>(,rt};  
OxqkpK&  
void CCaptureDlg::OnBrowse() +F+M[ef<ws  
{ -{A*`.[v  
 CString str; 0t7vg#v|  
 BROWSEINFO bi; .FC|~Z1T<F  
 char name[MAX_PATH]; b)@rp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); tn}MKo  
 bi.hwndOwner=GetSafeHwnd(); ' r/xBj[Z  
 bi.pszDisplayName=name; AK(x;4  
 bi.lpszTitle="Select folder"; Ui.S)\B  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; SM\qd4  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); *" +u^  
 if(idl==NULL) e%C_>  
  return; vwAtX($  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tmi)LRF H  
 str.ReleaseBuffer(); Vrs?VA`v$  
 m_Path=str; {r'+icvLX  
 if(str.GetAt(str.GetLength()-1)!='\\') %rJ 'DPs  
  m_Path+="\\"; Q2[; H!"  
 UpdateData(FALSE); 8p]9A,Uq&  
} i!)\m0Wm  
m UUNR,  
void CCaptureDlg::SaveBmp() 33g$mUB  
{ &O#,"u/q`  
 CDC dc; -\n%K  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); xZA.<Yd^r  
 CBitmap bm; ?[7KN8$  
 int Width=GetSystemMetrics(SM_CXSCREEN); MUSsanCA  
 int Height=GetSystemMetrics(SM_CYSCREEN); qP]1}-  
 bm.CreateCompatibleBitmap(&dc,Width,Height); QD%!a{I  
 CDC tdc; J4u>77I  
 tdc.CreateCompatibleDC(&dc); H$.K   
 CBitmap*pOld=tdc.SelectObject(&bm); LGK@taw^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); |-L7qZu%  
 tdc.SelectObject(pOld); j4I ~  
 BITMAP btm; ~G 3txd  
 bm.GetBitmap(&btm); gloJ;dE B  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; _@W1?;yD  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); yK-DzAv  
 BITMAPINFOHEADER bih; kpXxg: c  
 bih.biBitCount=btm.bmBitsPixel; A9;,y'm^8  
 bih.biClrImportant=0; pQ>|d H+.  
 bih.biClrUsed=0; aYn5AP'PH  
 bih.biCompression=0; RFoCM^  
 bih.biHeight=btm.bmHeight; 51Vqbtj^  
 bih.biPlanes=1; 2M=h:::W  
 bih.biSize=sizeof(BITMAPINFOHEADER); zl( o/n  
 bih.biSizeImage=size; {@6:kkd  
 bih.biWidth=btm.bmWidth; Cz &3=),G  
 bih.biXPelsPerMeter=0; uVTacN%X  
 bih.biYPelsPerMeter=0; Lv#0-+]$Bt  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); fUr%@&~l^  
 static int filecount=0; i%[+C  
 CString name; QiK-|hFj  
 name.Format("pict%04d.bmp",filecount++); t<o7 S:a"  
 name=m_Path+name; L9-Jwy2(>  
 BITMAPFILEHEADER bfh; `QtkC>[  
 bfh.bfReserved1=bfh.bfReserved2=0; RLZfXXMn  
 bfh.bfType=((WORD)('M'<< 8)|'B'); vn!5@""T  
 bfh.bfSize=54+size; `jSegG'  
 bfh.bfOffBits=54; GUZ.Pw  
 CFile bf; R9!U _RH  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ YxrMr9>l1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); S`$%C=a.  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ?U+hse3e~  
  bf.WriteHuge(lpData,size); ]6M,s0  
  bf.Close(); p]ujip  
  nCount++; <p}7T]a7  
 } z%#-2&i  
 GlobalFreePtr(lpData); 'v9M``  
 if(nCount==1) U8J9 #+:  
  m_Number.Format("%d picture captured.",nCount); XwFTAaZ  
 else F]D{[dBf  
  m_Number.Format("%d pictures captured.",nCount); {* P[dyu  
  UpdateData(FALSE); +3J<vM}dy  
} OF03]2j7<|  
d%.|MAE  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ="v`W'Pd  
{ O-[  
 if(pMsg -> message == WM_KEYDOWN) un4fnoc  
 { ;!G#Y Oe  
  if(pMsg -> wParam == VK_ESCAPE) Np%Q-T\  
   return TRUE; ~_Fx2T:X  
  if(pMsg -> wParam == VK_RETURN) OGIv".~s4  
   return TRUE; *5 .wwV  
 } D'vaK89\  
 return CDialog::PreTranslateMessage(pMsg); ~M8|r!_  
} mt$rjk=  
ZuybjV1/f6  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @_?2iN?4Z  
{ I;-Y2*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (qvH=VTwP  
  SaveBmp(); Hqs!L`oW)  
  return FALSE; n}_}#(a  
} T~k@Z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ U[02$gd0l  
 CMenu pop; c?e-2Dp(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); y*ZA{  
 CMenu*pMenu=pop.GetSubMenu(0); wU>Fz*  
 pMenu->SetDefaultItem(ID_EXITICON); AH:uG#  
 CPoint pt; >}\s-/  
 GetCursorPos(&pt); pS |K[:5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); e5 L_<V^Jo  
 if(id==ID_EXITICON) &l3(+4Sh  
  DeleteIcon(); '(rD8 pc  
 else if(id==ID_EXIT) q&J5(9]O|L  
  OnCancel(); tsL ; wT_  
 return FALSE; LWm1j:0  
} 3>^]r jFw  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Jx~H4y=z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4>i\r  
 AddIcon(); sv?Fx;d  
 return res; y: x<`E=  
} }6!/Nb  
(Hj[9[=  
void CCaptureDlg::AddIcon() /AAD Fa  
{ }oA>0Nw$K  
 NOTIFYICONDATA data; Q"C*j'n   
 data.cbSize=sizeof(NOTIFYICONDATA); {0w2K82  
 CString tip; eA86~M?<o  
 tip.LoadString(IDS_ICONTIP); D\b$$z]q  
 data.hIcon=GetIcon(0); '/NpmNY:L  
 data.hWnd=GetSafeHwnd(); `MCiybl,&P  
 strcpy(data.szTip,tip); Lc5zu7ncg  
 data.uCallbackMessage=IDM_SHELL; IHdA2d?.]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; IycZ\^5*-  
 data.uID=98; Te L&6F$  
 Shell_NotifyIcon(NIM_ADD,&data); S4`X^a}pY  
 ShowWindow(SW_HIDE); fs 2MYat  
 bTray=TRUE; oe]* Q  
} +^+'.xQ  
9Y'pT.Gy b  
void CCaptureDlg::DeleteIcon() 'fl< ac,.  
{ lYCvYe  
 NOTIFYICONDATA data; Qy0w'L/@  
 data.cbSize=sizeof(NOTIFYICONDATA); 'mbLK#q  
 data.hWnd=GetSafeHwnd(); ,c|MB  
 data.uID=98; Gmi? xGn  
 Shell_NotifyIcon(NIM_DELETE,&data); 4r7F8*z  
 ShowWindow(SW_SHOW); m9A%Z bQ^  
 SetForegroundWindow(); " Q?~LB  
 ShowWindow(SW_SHOWNORMAL); V%s7*`U  
 bTray=FALSE; oG1zPspL  
} c>K]$;}  
OQ hQ!6  
void CCaptureDlg::OnChange() {%G9iOV.  
{ i7-~"g  
 RegisterHotkey(); / Qd` ?  
} Lm~<BBp.  
'k[qx}  
BOOL CCaptureDlg::RegisterHotkey() }n4 T!N  
{ TLVsTM8 P  
 UpdateData(); d/ ^IL*O  
 UCHAR mask=0; M%`CzCL u  
 UCHAR key=0; gAWi&  
 if(m_bControl) \hgd&H0UU  
  mask|=4; cVW7I  
 if(m_bAlt) zplv.cf#q  
  mask|=2; Bh2l3J4X  
 if(m_bShift) 6!"wiM"]  
  mask|=1; V^ n6~O  
  key=Key_Table[m_Key.GetCurSel()]; p"p~Bx  
 if(bRegistered){ (cOe*>L;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); dT*Yv`h  
  bRegistered=FALSE; yy8-t2V  
 } m%`YAD@2z  
 cMask=mask; uL^; i""  
 cKey=key; (T#$0RFq  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); IS&qFi}W|W  
 return bRegistered; }x`Cnn  
} KhfADqji|  
bpwA|H%{M  
  四、小结 mG\QF0h  
i`2SebDj'w  
  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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