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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: I M G^L  
  U.N?cKv  
  一、实现方法 *rA]q' jM  
&BN#"- J  
  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: A5Lzd  
\%&eDE0  
#pragma data_seg("shareddata") Yzw[.(jc}  
HHOOK hHook =NULL; //钩子句柄 JgBC:t^\pV  
UINT nHookCount =0; //挂接的程序数目 rbrh;\<jM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ?$VkMu$2k  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 cVDcda|PE  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey bP&1tE  
static int KeyCount =0; N t\ZM  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 VPb8dv(a3  
#pragma data_seg() _IWLC{%V  
xcH&B %;f  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 #tA/)Jvi  
W"&,=wvg2  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: -L!lJ  
x kdC -S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 6!wk5#  
cKey,UCHAR cMask) (QQkXlJ  
{ 6i%X f i  
 BOOL bAdded=FALSE; .sD=k3d  
 for(int index=0;index<MAX_KEY;index++){ ~nApRC)0  
  if(hCallWnd[index]==0){ S1U[{R?,  
   hCallWnd[index]=hWnd; \r"gqv)^  
   HotKey[index]=cKey; ^%!#Q].  
   HotKeyMask[index]=cMask; w^N QLV S  
   bAdded=TRUE; WWATG=  
   KeyCount++; ;3o7>yEv  
   break; <6X*k{  
  } e0hY   
 } ^,aI2vC  
 return bAdded; ER0B{b  
} B:Hr{%O  
//删除热键 c:""&>Z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ri6KD  
{  s;-AZr)  
 BOOL bRemoved=FALSE; lX"6m}~D  
 for(int index=0;index<MAX_KEY;index++){ 6"R'z#{OF  
  if(hCallWnd[index]==hWnd){ >T-4!ZvS\j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9dWz3b1[]  
    hCallWnd[index]=NULL; (p<pF].  
    HotKey[index]=0; W||&Xb  
    HotKeyMask[index]=0; .eLd0{JtN  
    bRemoved=TRUE; iUk#hLLC  
    KeyCount--; zE~Xx p  
    break; o7@C$R_#  
   } D"%>  
  } I5 qrHBJ >  
 } w^U{e xo  
 return bRemoved; [v\m)5  
} <~uzKs0  
Q!_d6-*u  
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  DLL中的钩子函数如下: 4]6-)RHFB  
<>728;/C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6&il>  
{ @_1cY#!  
 BOOL bProcessed=FALSE; T"<)B^8f  
 if(HC_ACTION==nCode) 7Gy:T47T\@  
 { 'u~0rMe4})  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @0d"^  
   switch(wParam) :Qh rh(i  
   {  b'Km-'MtH  
    case VK_MENU: "p7nngn~  
     MaskBits&=~ALTBIT; y G3aF(  
     break; B{*{9!(l9  
    case VK_CONTROL: P^tTg  
     MaskBits&=~CTRLBIT; (|NCxey  
     break; lqKj;'  
    case VK_SHIFT: #'0Yzh]qc  
     MaskBits&=~SHIFTBIT; 6q6xqr:W  
     break; 72 |O&`O  
    default: //judge the key and send message ambr}+}  
     break; z+-o}i  
   } %"eR0Lj+zq  
   for(int index=0;index<MAX_KEY;index++){ ,~DV0#"  
    if(hCallWnd[index]==NULL) ZvMU3])u  
     continue; _54gqD2C,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &BRa5`  
    { |Wjpnz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cnI5 G!  
     bProcessed=TRUE; Wky9w r:g  
    } -$DfnAh  
   } v; R2,`[W  
  } c+ e~BN  
  else if((lParam&0xc000ffff)==1){ //有键按下 AV7#,+p%G  
   switch(wParam) cqSXX++CS,  
   { _{-[1-lN5_  
    case VK_MENU: }>d  
     MaskBits|=ALTBIT; }}i'8  
     break; G]4Ca5;Z!N  
    case VK_CONTROL:  *} ?  
     MaskBits|=CTRLBIT; n,2   
     break; =^i K^)  
    case VK_SHIFT: *3r s+0  
     MaskBits|=SHIFTBIT; ft$RF  
     break; |`t 6lVO,Z  
    default: //judge the key and send message 5doi4b>]!  
     break; {ywwJ  
   } uYWD.]X;[  
   for(int index=0;index<MAX_KEY;index++){ +`_0tM1  
    if(hCallWnd[index]==NULL) oQObr  
     continue; O9ps?{g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 40pz<-B  
    { J=k=cFUX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "RN] @p#m  
     bProcessed=TRUE; 8-Y*b89  
    } %,~?;JAj  
   } 28`s+sH  
  } `$ S&:Q,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &Jc atI  
   for(int index=0;index<MAX_KEY;index++){ -5 D<zP/  
    if(hCallWnd[index]==NULL) %1.F;-GdsW  
     continue; YO$D-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %9a3$OGZX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); BdF/(Pg  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 yCvtglAJ4  
   } S#?2E8  
  } ninWnQq  
 } 7HBf^N.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zh*D2/ r  
} KE@+I.x  
5a$EXV  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: [`t ;or  
C5Q!_x(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U/^#nU.,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6]Is"3ca  
^n(FO,8c  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: e-`.Ht  
#$x,PeG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) S`U8\KTi  
{ 0B7G:X0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  d]`6N  
 { .JXEw%I@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 jr?/wtw  
  SaveBmp(); HFZ'xp|3dn  
  return FALSE; tVEe)QX  
 } jD6HCIjd'  
 …… //其它处理及默认处理 vxj:Y'}  
} h_[{-WC  
VMRfDaO9  
!>n!Q*\(Ov  
  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。 b4i=%]v8  
XPO-u]<W  
  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。 6]Hwr_/tk  
45 sEhs[$  
  二、编程步骤 CqlxE/|  
$R/@8qnP 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"; _&BK4?H@b  
=g9n =spAn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; YM:sLeQ~c  
5@m ,*n&[  
  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; <1l%|   
SL-2^\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; HS/.H,X  
.Y;f 9R  
  5、 添加代码,编译运行程序。 TA-2{=8  
:LY.C<8  
三、程序代码 JM|HnyI  
"u!gfG?oH  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL dX cbS<  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) QQ.?A(U7  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ V;xPZ2C;  
#if _MSC_VER > 1000 J W@6m  
#pragma once Wvf>5g)?  
#endif // _MSC_VER > 1000 KtL?,zi  
#ifndef __AFXWIN_H__ E 6TeZ%g  
#error include 'stdafx.h' before including this file for PCH 5 ix*wu`,  
#endif !q\=e@j-i  
#include "resource.h" // main symbols f?Zjd&|Ch  
class CHookApp : public CWinApp p{^:b6  
{ 4k<o  
 public: @)6b  
  CHookApp(); Lc{arhN  
  // Overrides @"MYq#2c$  
  // ClassWizard generated virtual function overrides M/=36{,w-  
  //{{AFX_VIRTUAL(CHookApp) ly17FLJ].  
 public: k8+J7(_c  
  virtual BOOL InitInstance(); FT- .gi0  
  virtual int ExitInstance(); )bOfs*S  
  //}}AFX_VIRTUAL z/ 1$G"  
  //{{AFX_MSG(CHookApp) =# Sw.N  
  // NOTE - the ClassWizard will add and remove member functions here. at_*Zh(  
  // DO NOT EDIT what you see in these blocks of generated code ! MONX&$  
  //}}AFX_MSG hi1Ial\Y  
  DECLARE_MESSAGE_MAP() n9+33^ PT  
}; s Z[[ymu8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 0vm>*M*p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pD%(Y^h?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O D}RnKL  
BOOL InitHotkey(); ~~OFymQ%?q  
BOOL UnInit(); **hQb$  
#endif g %f5hy  
*#XZ*Ga  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. '6dVe 2V  
#include "stdafx.h" Snf_{A<  
#include "hook.h" 1n8[fgz  
#include <windowsx.h> e.n(NW  
#ifdef _DEBUG "=Br&FN{|  
#define new DEBUG_NEW e c&Y2  
#undef THIS_FILE kL*P 3 0  
static char THIS_FILE[] = __FILE__; #u hUZq  
#endif ?7aZU  
#define MAX_KEY 100 DO*U7V02  
#define CTRLBIT 0x04 sE% $]Jp  
#define ALTBIT 0x02 W\~^*ny P6  
#define SHIFTBIT 0x01 ,I jZQ53q~  
#pragma data_seg("shareddata") qgrJi +WZ  
HHOOK hHook =NULL; 0hemXvv1  
UINT nHookCount =0; 5[ zN M  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey M,]|L ch  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT MNd\)nX  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ."$t&[;s  
static int KeyCount =0; - eG~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2IJK0w@  
#pragma data_seg() H{*D c_  
HINSTANCE hins; :25LQf^nz  
void VerifyWindow(); +lx& $mr?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 2 |je{  
//{{AFX_MSG_MAP(CHookApp) A `Z/B[)  
// NOTE - the ClassWizard will add and remove mapping macros here. kXSX<b<%  
// DO NOT EDIT what you see in these blocks of generated code! uAn}qrqE9  
//}}AFX_MSG_MAP 5daq}hsQs  
END_MESSAGE_MAP() @L3XBV2  
2FIL@f|\7z  
CHookApp::CHookApp() y/Xs+ {x  
{ ' k,2*.A  
 // TODO: add construction code here, l a3B`p  
 // Place all significant initialization in InitInstance )\akIA  
} (I >Ch)'  
]3_b3@k  
CHookApp theApp; dz_S6o ]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R*[sO*h\k  
{ =fcg4h5(  
 BOOL bProcessed=FALSE; KxkBP/`3Q  
 if(HC_ACTION==nCode) b7QE  
 { Za:j;u Y  
  if((lParam&0xc0000000)==0xc0000000){// Key up &jP1Q3  
   switch(wParam) cpQ5F;FI  
   { h[mT4 e3c  
    case VK_MENU: xLW$>;kI  
     MaskBits&=~ALTBIT; R/+$ :  
     break; v-1}&K  
    case VK_CONTROL: &xnQLz:#  
     MaskBits&=~CTRLBIT; vF27+/2+R  
     break; -'&/7e6>y  
    case VK_SHIFT: G4)~p!TSQ  
     MaskBits&=~SHIFTBIT; ;g|Vt}a&4  
     break; za_b jE  
    default: //judge the key and send message ;+9OzF ;  
     break; sK}AS;:  
   } 'C[tPP  
   for(int index=0;index<MAX_KEY;index++){ 4ijtx)SA  
    if(hCallWnd[index]==NULL) T }#iXgyx  
     continue; Hb)FeGsd).  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w' 7sh5  
    { /{^k8 Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @Vm*b@  
     bProcessed=TRUE; Og\k5.! ,  
    } 9bM\ (s/  
   } 80=0S^gEZ  
  } j6m;03<|  
  else if((lParam&0xc000ffff)==1){ //Key down K zWo}tT  
   switch(wParam) &`r/+B_W  
   { uz8LF47@:-  
    case VK_MENU: U2 *ORd  
     MaskBits|=ALTBIT; U+Y(:  
     break; ~aob@(  
    case VK_CONTROL: 8SGaS&  
     MaskBits|=CTRLBIT; jeC=s~  
     break; c[h~=0UtJ  
    case VK_SHIFT: 6mM9p)"$  
     MaskBits|=SHIFTBIT; @5>#<LV=E#  
     break; cLtVj2Wb  
    default: //judge the key and send message U$OZkHA[  
     break; 39X~<\&'  
   } `b?uQ\#-M  
   for(int index=0;index<MAX_KEY;index++) 4b;Mb  
   { =oBpS=<7  
    if(hCallWnd[index]==NULL) W XQ@kQD  
     continue; X6HaC+P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 02-ql F@i  
    { vF72#BNs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); kK? SG3  
     bProcessed=TRUE; ^tB 1Nu %  
    } #Bd]M#J17a  
   } UL+Txc  
  } 6D;N.wDZ  
  if(!bProcessed){ -%asHDQ{  
   for(int index=0;index<MAX_KEY;index++){ p* >z:=  
    if(hCallWnd[index]==NULL) }3(!kW  
     continue; 1JJsYX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) owAO&"C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }p)K6!J0  
   } y* +y&  
  } Y}?8  
 }  W2vL<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DR#" 3  
} 5 UEZpxnv  
~7]V^tG  
BOOL InitHotkey() *8}b&4O~  
{ t-\+t<;  
 if(hHook!=NULL){ :Jd7q.  
  nHookCount++; 4V+bE$Wu  
  return TRUE; c!6D{(sfh  
 } Itl8#LpLM  
 else l1+l@r\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Uj!3MF  
  if(hHook!=NULL) o@:"3s  
   nHookCount++; cn'>dz3v  
  return (hHook!=NULL); m:H^m/g  
} SQodk:1)  
BOOL UnInit()  384n1?  
{ DH(<{ #u  
 if(nHookCount>1){ xT HD_?d  
  nHookCount--; /3b *dsYsl  
  return TRUE; SDnl^a  
 } S$mv(C  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !=[Y yh  
 if(unhooked==TRUE){ q}{E![ZTu  
  nHookCount=0; 0Hnj<|HL  
  hHook=NULL; 8D*7{Q  
 } #ArrQeO 5_  
 return unhooked; 6h:QSVfx  
} n Bu!2c  
HbTVuf o  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OH`a3E{e  
{ \6b~$\~B  
 BOOL bAdded=FALSE; u$nzpw0=H  
 for(int index=0;index<MAX_KEY;index++){ 6!<I'M'[e  
  if(hCallWnd[index]==0){ "Y&I#&$b\  
   hCallWnd[index]=hWnd; [&lK.?V)  
   HotKey[index]=cKey; il0K ^i  
   HotKeyMask[index]=cMask; O. * 0;5  
   bAdded=TRUE; (v]%kXy/G  
   KeyCount++; z:QDWH  
   break; bZu'5+(@  
  } R"nB4R0Uh  
 } g4?2'G5m?  
 return bAdded; Oa[  
} R5HT EB  
WgNA%.|,  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C=?S  
{ X4;U4pU#  
 BOOL bRemoved=FALSE; `4"8@>D  
 for(int index=0;index<MAX_KEY;index++){ W}(A8g#6  
  if(hCallWnd[index]==hWnd){ ]S2rqKB  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )2f#@0SVL  
    hCallWnd[index]=NULL; SB62(#YR  
    HotKey[index]=0; _"8n&=+  
    HotKeyMask[index]=0; 'E| %l!xO  
    bRemoved=TRUE; i VSNara  
    KeyCount--; :5YIoC  
    break; ]N>ZOV,>  
   } #:)'D?,  
  } )V1XL   
 } t@%w:*&  
 return bRemoved; ^~4]"J};M  
} z/7q#~J,  
5P,&VB8L  
void VerifyWindow() V?mP7  
{ bWFa{W5!  
 for(int i=0;i<MAX_KEY;i++){ ?ANW I8'_j  
  if(hCallWnd!=NULL){ ~f<'] zXv  
   if(!IsWindow(hCallWnd)){ ~k*]Z8Z  
    hCallWnd=NULL; [ 8Ohg  
    HotKey=0; 15:9JVH3D  
    HotKeyMask=0; 66=[6U9 *  
    KeyCount--; %4~"$kE  
   } {*xE+ |  
  } 4^7 v@3  
 } o}N@Q-i gq  
} LU3pCM{  
%YG?7PBB  
BOOL CHookApp::InitInstance() LjZlKB5C  
{ EP>u%]#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); t{k:H4  
 hins=AfxGetInstanceHandle(); !I7$e&Uz@  
 InitHotkey(); j\}.GM'8  
 return CWinApp::InitInstance(); Y\ [|k-6  
} Aztrq  
F^dJ{<yX  
int CHookApp::ExitInstance() 2BccE  
{ .f~9IAXP`  
 VerifyWindow(); =*UK!y?n  
 UnInit(); ;dIk$_FN  
 return CWinApp::ExitInstance(); g]~vZj  
} v({O*OR  
@-@Coy 4Tt  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !6/UwPs  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) {vu\qXmMv  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oO2DPcK  
#if _MSC_VER > 1000 -H?c4? 5  
#pragma once ;&d#)&O"e  
#endif // _MSC_VER > 1000 91R# /i  
YidcVlOsO  
class CCaptureDlg : public CDialog Wa;N(zw0h  
{ O8;/oL4 U  
 // Construction 9o@3$  
 public: i?T-6{3I  
  BOOL bTray; Q 3WD!Z8y  
  BOOL bRegistered; cU;Bm}U  
  BOOL RegisterHotkey(); w2B)$u  
  UCHAR cKey; wNa5qp 0  
  UCHAR cMask; .6y+van  
  void DeleteIcon(); E\iK_'#  
  void AddIcon(); 2Zu9? L ,I  
  UINT nCount; 7D'\z IW  
  void SaveBmp(); BMp'.9Qgm  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor yfl?\X{  
  // Dialog Data #Xg;E3BM  
  //{{AFX_DATA(CCaptureDlg) oW~W(h!  
  enum { IDD = IDD_CAPTURE_DIALOG }; Zkp~qx  
  CComboBox m_Key; pGie!2T E  
  BOOL m_bControl; `KQx#c>'  
  BOOL m_bAlt; Vgm*5a6t  
  BOOL m_bShift; XIcUoKg^  
  CString m_Path; ^".OMS"!  
  CString m_Number; m?S;s ew@5  
  //}}AFX_DATA rm-d),Zt  
  // ClassWizard generated virtual function overrides V]zZb-m=  
  //{{AFX_VIRTUAL(CCaptureDlg) %&L1 3:  
 public: V.B@@ ;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 6uE20O<z]  
 protected: C'#KTp4!1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0["93n}r  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9#DXA}  
  //}}AFX_VIRTUAL %A zy#m  
  // Implementation Ip8ml0oG  
 protected: ]J Yz(m[   
  HICON m_hIcon; +C% 6jGGh  
  // Generated message map functions & bTCTDZh  
  //{{AFX_MSG(CCaptureDlg) )zL@h  
  virtual BOOL OnInitDialog(); dGZie .Zx  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); o2fih%p?1  
  afx_msg void OnPaint(); }aWy#Oe  
  afx_msg HCURSOR OnQueryDragIcon(); tLzLO#/n  
  virtual void OnCancel(); eRUdPPq_d  
  afx_msg void OnAbout(); <Jgcj 4D  
  afx_msg void OnBrowse(); YZ~MByu  
  afx_msg void OnChange(); hBU)gP75  
 //}}AFX_MSG w=GMQ8  
 DECLARE_MESSAGE_MAP()  'z} t= ?  
}; 5]O{tSj  
#endif gWj-@o\  
O:?3B!wF  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;yNc 7Vl  
#include "stdafx.h" $PJ==N  
#include "Capture.h" ZTR9e\F  
#include "CaptureDlg.h" N R c4*zQJ  
#include <windowsx.h> 9evr!=":  
#pragma comment(lib,"hook.lib") n>ryS/1  
#ifdef _DEBUG joY7Vk!<o  
#define new DEBUG_NEW 217G[YE-  
#undef THIS_FILE 7uR;S:WX  
static char THIS_FILE[] = __FILE__; Y j oe|  
#endif <Km9Mq  
#define IDM_SHELL WM_USER+1 4  OPY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *'((_ NZ>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '#6e Ub  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ox-m)z `7  
class CAboutDlg : public CDialog P~ObxY|  
{ aUw-P{zp%  
 public: "L3mW=!*  
  CAboutDlg(); LS~at.3zX  
  // Dialog Data g Wtc3  
  //{{AFX_DATA(CAboutDlg) 53t_#Yte  
  enum { IDD = IDD_ABOUTBOX }; ,`t+X=#  
  //}}AFX_DATA [c{\el9H  
  // ClassWizard generated virtual function overrides MblRdj6  
  //{{AFX_VIRTUAL(CAboutDlg) a_Y<daRO  
 protected: x2!R&q8U>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K P]ar.  
  //}}AFX_VIRTUAL U9oUY> 9  
  // Implementation {/QVs?d  
 protected: <-I69`  
  //{{AFX_MSG(CAboutDlg) G9:XEEN  
  //}}AFX_MSG =WTSaC  
  DECLARE_MESSAGE_MAP() XIwJhsYZ'9  
}; J,}h{-Xy`  
d:)#-x*h7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) fJS:46  
{ =x<N+vjXY  
 //{{AFX_DATA_INIT(CAboutDlg) dlYpbw}W&<  
 //}}AFX_DATA_INIT AE rPd)yk0  
} =|oi0  
`2Pa{g- .  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BqNsW (+  
{ 6ll!7U(9(  
 CDialog::DoDataExchange(pDX); VWft/2p~  
 //{{AFX_DATA_MAP(CAboutDlg) 5/"$ _7"{a  
 //}}AFX_DATA_MAP f~VlCdf+  
} }n^Rcz6HeO  
TIGtX]`  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $d*9]M4  
 //{{AFX_MSG_MAP(CAboutDlg) "\wMs  
 // No message handlers 3E*|^*  
 //}}AFX_MSG_MAP (=j;rfvP  
END_MESSAGE_MAP() sF{~7IB  
%,\JTN|g|A  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) J ?o  
: CDialog(CCaptureDlg::IDD, pParent)  qb? <u  
{ <Y yE1 |  
 //{{AFX_DATA_INIT(CCaptureDlg) %7ngAIg  
  m_bControl = FALSE; hTDK[4e  
  m_bAlt = FALSE; Qu|CXUk  
  m_bShift = FALSE; =F+v+zP7P  
  m_Path = _T("c:\\"); /h>g-zb  
  m_Number = _T("0 picture captured."); z:\9t[e4  
  nCount=0; p@jw)xI  
  bRegistered=FALSE; ed6@o4D/kf  
  bTray=FALSE; re*}a)iL  
 //}}AFX_DATA_INIT =Dn <DV  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 L-|l$Ti"  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,ua1sTgQ  
} 0:V /z3?  
\V-N~_-H  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )ce 6~   
{ 5f*_K6,v  
 CDialog::DoDataExchange(pDX); D40 vCax^J  
 //{{AFX_DATA_MAP(CCaptureDlg) 4p"'ox#  
  DDX_Control(pDX, IDC_KEY, m_Key); Bve|+c6W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *qzdt^[ xo  
  DDX_Check(pDX, IDC_ALT, m_bAlt); zxn|]P bS  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); .~i|kc]Ue  
  DDX_Text(pDX, IDC_PATH, m_Path); Go%Z^pF3CO  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L;3%8F\-.  
 //}}AFX_DATA_MAP AYn65Ly  
} Fx^wV^q3  
lEk@I"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) -PpcFLZ|  
//{{AFX_MSG_MAP(CCaptureDlg) NzT &K7v  
 ON_WM_SYSCOMMAND() `G$>T#Dq  
 ON_WM_PAINT() ^`cv6;)  
 ON_WM_QUERYDRAGICON() EJn]C=_(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) >eTbg"\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P<vl+&*  
 ON_BN_CLICKED(ID_CHANGE, OnChange) WZ-~F/:c%  
//}}AFX_MSG_MAP .I^4Fc}&4  
END_MESSAGE_MAP() 19$A!kH\  
/S]$Hu|  
BOOL CCaptureDlg::OnInitDialog() #QwkRzVoy  
{ %5e|  
 CDialog::OnInitDialog(); Y D<3#Dr]  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Tri\5O0lPs  
 ASSERT(IDM_ABOUTBOX < 0xF000); UyRy>:n  
 CMenu* pSysMenu = GetSystemMenu(FALSE); I# tlaz#  
 if (pSysMenu != NULL) CzBYH   
 {  ;+~5XLk  
  CString strAboutMenu; .`IhxE~mN  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Em!- W5*s  
  if (!strAboutMenu.IsEmpty()) E&8Nh J  
  { i)x0 ]XF  
   pSysMenu->AppendMenu(MF_SEPARATOR); ov+{<0Q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Wep^He\:  
  } |u>V> PN  
 } $M}"u [Qq  
 SetIcon(m_hIcon, TRUE); // Set big icon -_ 9k+AV  
 SetIcon(m_hIcon, FALSE); // Set small icon ]W3_]N 3  
 m_Key.SetCurSel(0); *q6XK_  
 RegisterHotkey(); X7$]qE K  
 CMenu* pMenu=GetSystemMenu(FALSE); t=Oq<r  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); PaKa bPY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); i%o%bib#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9Jwd*gevV  
 return TRUE; // return TRUE unless you set the focus to a control Z:{| ?4  
} p4P=T@:  
X,49(-~\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5|rBb[  
{ n.@HT"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |[rn/  
 { _%CM<z e  
  CAboutDlg dlgAbout; t oA}0MI(:  
  dlgAbout.DoModal(); y_9\07va<  
 } Gi)Vr\Q.  
 else "lt<$.  
 { |" }rdOV)  
  CDialog::OnSysCommand(nID, lParam); iDDJJ>F26  
 } sRt7.fe  
} TJv .T2|  
`"=Hk@E  
void CCaptureDlg::OnPaint() @g#5d|U);  
{ ejd_ 85$  
 if (IsIconic()) $2uC%er"H  
 { myj/93p}`b  
  CPaintDC dc(this); // device context for painting 20}HTV{v  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >*EZZ\eU!  
  // Center icon in client rectangle $q\"d?n  
  int cxIcon = GetSystemMetrics(SM_CXICON); fizW\f8ai  
  int cyIcon = GetSystemMetrics(SM_CYICON); 4ior  
  CRect rect; E+Bc>xl@ m  
  GetClientRect(&rect); ~R;/u")@e  
  int x = (rect.Width() - cxIcon + 1) / 2; )1 -<v);  
  int y = (rect.Height() - cyIcon + 1) / 2; XHA|v^  
  // Draw the icon r:sa|+  
  dc.DrawIcon(x, y, m_hIcon); HVa D  
 } IT NFmD  
 else /Q st :q  
 { xuUEJ a&  
  CDialog::OnPaint(); pEwo}NS*H  
 } Bv7FZK3  
} bo#xqSGQ  
ir6aV|ea!  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?q`i MiN  
{ a6gw6jQ  
 return (HCURSOR) m_hIcon; uBts?02  
} bkdXBCBx?  
5ih>x3S1/  
void CCaptureDlg::OnCancel() +[ ?!@)  
{ ` +YtTK  
 if(bTray) <Z.`X7]Uk  
  DeleteIcon(); JLm3qIC  
  CDialog::OnCancel(); Dspvc  
} Pyuul4(  
vP,pK=5  
void CCaptureDlg::OnAbout() Zd-qBOB2L  
{ =bh: U90y  
 CAboutDlg dlg; 1{M?_~g 4  
 dlg.DoModal(); }36AeJ7L  
} K{d3)lVYCS  
9<3(  QR  
void CCaptureDlg::OnBrowse() Tbm ~@k(C  
{ Osz=OO{  
 CString str; #[bosb!R  
 BROWSEINFO bi; )bg|l?  
 char name[MAX_PATH]; M IIa8 ;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); oO;L l?~  
 bi.hwndOwner=GetSafeHwnd(); 3!9JXq%Hl  
 bi.pszDisplayName=name; M_!]9#:K7  
 bi.lpszTitle="Select folder"; mo<*h&;&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2D%2k  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); BP j?l  
 if(idl==NULL) ~j[?3E4L}  
  return; G$a@}9V  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y*@7/2,  
 str.ReleaseBuffer(); gE#|eiu  
 m_Path=str; (8 7wWhH  
 if(str.GetAt(str.GetLength()-1)!='\\') z#!<[**&  
  m_Path+="\\"; Aq(cgTNW  
 UpdateData(FALSE); I'IFBVhaYn  
} GDCp@%xW  
ga|<S@u?}  
void CCaptureDlg::SaveBmp() %( OP  [  
{ n=j) M  
 CDC dc; K^o$uUBe  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); IwYfs]-  
 CBitmap bm; zx<t{e7  
 int Width=GetSystemMetrics(SM_CXSCREEN); gH7  +#/  
 int Height=GetSystemMetrics(SM_CYSCREEN); \j!/l f)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0m1V@ 3]7>  
 CDC tdc; (_#E17U)_  
 tdc.CreateCompatibleDC(&dc); egsP\ '  
 CBitmap*pOld=tdc.SelectObject(&bm); & PXT$x[i  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); {*bx8*y1  
 tdc.SelectObject(pOld); T[OI/ WuK  
 BITMAP btm; -Y+pLvG*  
 bm.GetBitmap(&btm); g<;pyvq|:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0fstEExw  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); lO\HchG zB  
 BITMAPINFOHEADER bih; WCd: (8B  
 bih.biBitCount=btm.bmBitsPixel; +E9G"Z65iP  
 bih.biClrImportant=0; &M5v EPR  
 bih.biClrUsed=0; GTB\95j]  
 bih.biCompression=0; }],l m  
 bih.biHeight=btm.bmHeight; &wU"6E  
 bih.biPlanes=1; ,62~u'hR5  
 bih.biSize=sizeof(BITMAPINFOHEADER); e,#w* |  
 bih.biSizeImage=size; T7i>aM$+  
 bih.biWidth=btm.bmWidth; "3jTU  
 bih.biXPelsPerMeter=0; Ngx2N<$<*g  
 bih.biYPelsPerMeter=0; qy?$t:*pp  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); q/ :]+  
 static int filecount=0; rbOJ;CK  
 CString name; j8Mt"B  
 name.Format("pict%04d.bmp",filecount++); `~\SQ EY$  
 name=m_Path+name; +h-% {  
 BITMAPFILEHEADER bfh; kT   
 bfh.bfReserved1=bfh.bfReserved2=0; *b~8`O pa`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 8r>\scS  
 bfh.bfSize=54+size; jh z*Y}MX  
 bfh.bfOffBits=54; )j'Qi^;(D  
 CFile bf; n]vCvmt  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ [3=Y 9P:  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); , l!>+@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); An>ai N]  
  bf.WriteHuge(lpData,size); 9Znc|<  
  bf.Close(); w)J-e gc  
  nCount++; < - sr&  
 } Zl%)#=kO  
 GlobalFreePtr(lpData); h7ZH/g$)  
 if(nCount==1) kReZch}  
  m_Number.Format("%d picture captured.",nCount); 1d!s8um;  
 else jSBz),.XU}  
  m_Number.Format("%d pictures captured.",nCount); { #B/4  
  UpdateData(FALSE); prM)t8SE  
} \aPH_sf,  
w8 S pt  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,y"vf^BE.  
{ +EA ")T<l  
 if(pMsg -> message == WM_KEYDOWN) F%zMhX'AG  
 { [,st: Y  
  if(pMsg -> wParam == VK_ESCAPE) 3W ]zLUn  
   return TRUE; uN?Lz1W\;  
  if(pMsg -> wParam == VK_RETURN) Hwd^C 2v  
   return TRUE; V O1   
 } }x$@j  
 return CDialog::PreTranslateMessage(pMsg); dR i6  
} x xzUey  
7gLk~*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vC&0UNe$  
{ 1r4NP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ **-rPonM[  
  SaveBmp(); UazK0{t<f  
  return FALSE; RJ3uu NK7  
} 8 |= c3Z  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =KO]w9+\  
 CMenu pop; o *U-.&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >&>EjK4?  
 CMenu*pMenu=pop.GetSubMenu(0); XRM/d5  
 pMenu->SetDefaultItem(ID_EXITICON); Jo8fMG\P  
 CPoint pt; G \a`F'Oo  
 GetCursorPos(&pt); })8D3kzX)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (' %Y3z;  
 if(id==ID_EXITICON) 8d1qRCIz  
  DeleteIcon(); yL<u>S0  
 else if(id==ID_EXIT) hG`@#9|f  
  OnCancel(); }'{"P#e8"q  
 return FALSE; +5-|6  
} 6f0o'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); >8{{H"$;(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) bCTN^  
 AddIcon(); 3 P75:v  
 return res; O|Vc  
} %d-WQwJ  
(-1{W^(  
void CCaptureDlg::AddIcon() NH5sV.vvc  
{ \ eba9i^  
 NOTIFYICONDATA data; vnf2Z,f%  
 data.cbSize=sizeof(NOTIFYICONDATA); w"D1mI!L 7  
 CString tip; WJ8osWdLu  
 tip.LoadString(IDS_ICONTIP); Ymnh%wS  
 data.hIcon=GetIcon(0); Qru&lAYc<  
 data.hWnd=GetSafeHwnd(); 3XUVUd~  
 strcpy(data.szTip,tip); Xsn M}  
 data.uCallbackMessage=IDM_SHELL; sJQ~ :p0e  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; UZ<.R"aK  
 data.uID=98; C_ ;nlG6  
 Shell_NotifyIcon(NIM_ADD,&data); VNz? e&>  
 ShowWindow(SW_HIDE); ;9#W#/B  
 bTray=TRUE; v}5YUM0H`  
} m' j1  
g"!cO^GkT  
void CCaptureDlg::DeleteIcon() "tO m  
{ %Y/;jC Y  
 NOTIFYICONDATA data; $M,Q"QL  
 data.cbSize=sizeof(NOTIFYICONDATA); IEM{?  
 data.hWnd=GetSafeHwnd(); G{|"WaKW  
 data.uID=98; [Djx@x  
 Shell_NotifyIcon(NIM_DELETE,&data); | Wj=%Ol%o  
 ShowWindow(SW_SHOW); ' 8R5 Tl  
 SetForegroundWindow();  $AZ=;iP-  
 ShowWindow(SW_SHOWNORMAL); g;q.vHvsc"  
 bTray=FALSE; 'lEIwJV$  
} /EHO(d!<  
T.QJ#vKO0  
void CCaptureDlg::OnChange() "Ar|i8^G3  
{ [# X} (  
 RegisterHotkey(); K5<2jl3S  
} it>Bf;  
y% !.:7Y  
BOOL CCaptureDlg::RegisterHotkey() $zhvI*0  
{ e&A3=a~\s  
 UpdateData(); V\n!?1{kdF  
 UCHAR mask=0; 3ohHBo  
 UCHAR key=0; $t6t 6<M)  
 if(m_bControl) 247vU1  
  mask|=4; `6YN/"unfp  
 if(m_bAlt)  D5Jg(-  
  mask|=2; V2;Nv\J\  
 if(m_bShift) Az(,Q$"|5  
  mask|=1; ncVt (!c,e  
  key=Key_Table[m_Key.GetCurSel()]; ,'<NyA><  
 if(bRegistered){ U0|bKU  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); #PC*l\ )  
  bRegistered=FALSE; ())_4 <  
 } "9X(.v0ze  
 cMask=mask; Jv%)UR.]  
 cKey=key; qv2J0'd'.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); VWYNq^<AT  
 return bRegistered; e<8KZ  
} W?N+7_%'  
S<*1b 6%D  
  四、小结 +?QHSIQo  
VgY6M_V  
  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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