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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: 9ZDbZc  
  7_J0[C!G  
  一、实现方法 J^zB 5W,)  
M]xfH*  
  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: z~/e\  
I(j$^DA.  
#pragma data_seg("shareddata") >|mZu)HIY;  
HHOOK hHook =NULL; //钩子句柄 8Ep!  
UINT nHookCount =0; //挂接的程序数目 (Mw+SM3<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 w,t !<i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 g O/\Yi  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QE721y   
static int KeyCount =0; uW4.Q_O!H  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 0XI6gPo%  
#pragma data_seg() 9[[$5t`8  
UD Pn4q  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 W *2P+H%  
T>, [V:  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: GQ sE5Vb  
SQ<{X/5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR B[d%?L_  
cKey,UCHAR cMask) F:AVik  
{ z Ece>=C  
 BOOL bAdded=FALSE; Lzx2An@R  
 for(int index=0;index<MAX_KEY;index++){ T&j:gg  
  if(hCallWnd[index]==0){  }- wK  
   hCallWnd[index]=hWnd; ~VV$wU!A  
   HotKey[index]=cKey; 9x eg,#1  
   HotKeyMask[index]=cMask; gOMy8w4>  
   bAdded=TRUE; ^b 3nEcQn  
   KeyCount++;  vSo1WS  
   break; *hh9 K  
  } D$VRE^k  
 } % zO>]f&  
 return bAdded; {: =]J4]  
} H;#C NB<e  
//删除热键 /h@3R[k  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AB<%GzW0(  
{ NHe[,nIV  
 BOOL bRemoved=FALSE; U#{(*)qr  
 for(int index=0;index<MAX_KEY;index++){ Hx n#vAc  
  if(hCallWnd[index]==hWnd){ !t?5U_on  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |O;vWn'U2  
    hCallWnd[index]=NULL; R: [#OH.c  
    HotKey[index]=0; nd w&F'.r  
    HotKeyMask[index]=0; fr}.#~{5Y  
    bRemoved=TRUE; o ^ 08<  
    KeyCount--; 2s}G6'xE]P  
    break; ; O ~%y'  
   } QY*F(S,\  
  } M^G9t*I  
 } QQD7NN>  
 return bRemoved; x:c'ek  
} )5u#'5I>  
.R^ R|<x  
iu2O/l# r  
  DLL中的钩子函数如下: Z:diM$Z?7  
:k2 J &@8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0qm CIcg  
{ h-U]?De5\  
 BOOL bProcessed=FALSE; KL"_h`UW  
 if(HC_ACTION==nCode) 6q,CEm  
 { Y Azj>c&  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 'Z)#SzY  
   switch(wParam) AYDAt5K_  
   {  +W8kMuM!  
    case VK_MENU: Hm+VGH'H?  
     MaskBits&=~ALTBIT; V6B[eV$D  
     break; %g69kizoWi  
    case VK_CONTROL: 8Nx fYA  
     MaskBits&=~CTRLBIT; 0v``4z2Z  
     break; P G zwS  
    case VK_SHIFT: 2>f3n W  
     MaskBits&=~SHIFTBIT; W*/2x8$d  
     break; gLlA'`!  
    default: //judge the key and send message [WXcp1p  
     break; <RcB: h  
   } -h=wLYl@0i  
   for(int index=0;index<MAX_KEY;index++){ ]C{N4Ni^Z  
    if(hCallWnd[index]==NULL) .N7&Jy  
     continue; 7^1K4%IPl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t0Inf [um  
    { |nU%H=Rs/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SZ:R~4 A  
     bProcessed=TRUE; zoBp02j  
    } VBW][f  
   } -b34Wz(  
  } !j3Xzn9  
  else if((lParam&0xc000ffff)==1){ //有键按下 R _2#7Xs  
   switch(wParam) {c7@`AV]  
   { "![KQ  
    case VK_MENU: uE>m3Y(aP  
     MaskBits|=ALTBIT; {fY(zHC  
     break; >y$*|V}k  
    case VK_CONTROL: X|L_}Q7  
     MaskBits|=CTRLBIT; fw|t`mUGu  
     break; w^:@g~  
    case VK_SHIFT: 5i'KGL  
     MaskBits|=SHIFTBIT; "2 D{X  
     break; QBA{*@ A-  
    default: //judge the key and send message Z{2QDjAI;  
     break; }4Q3S1|U  
   } X@/X65=[  
   for(int index=0;index<MAX_KEY;index++){ ,V)hV@Dk  
    if(hCallWnd[index]==NULL) w9Nk8OsL  
     continue; &SPIu,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X?]Mzcu  
    { v7v>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |w-s{L3@+  
     bProcessed=TRUE; rEWuWv$  
    } nN>Uh T  
   } 2#8PM-3"  
  } {;o54zuKf  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 qat'Vj,  
   for(int index=0;index<MAX_KEY;index++){ n.,ZgLx["  
    if(hCallWnd[index]==NULL) ClufP6'  
     continue; ^c"\%!w"O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F5{GMn;j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >b~Q%{1  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !Nbi&^k B  
   } ,t|_Nc  
  } H~:g =Zw  
 } }ee3'LUPX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); j`_Z`eG  
} 9h<iw\ $'  
5nK|0vv%2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 89W8cJ$yW  
 h}}7_I9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -:wV3D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vkqfs4t  
X.rbJyKe  
  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: 6!){-IV  
J+`gr_&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,S?:lQuK5  
{ m-q O yt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6K >(n  
 { ^plP1c:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 R5 EC/@  
  SaveBmp(); v4\ m9Pu4  
  return FALSE; EPM(hxCIQ  
 } ) urUa E  
 …… //其它处理及默认处理 5UQ[vHMqI  
} OQDx82E  
#Zn+-Ih  
Rb <{o8  
  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。 , _xJ9_  
k;.<DN  
  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。 UYpln[S  
o Y<vKs^  
  二、编程步骤 (unJwh{7Q  
YLV$#a3  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; D~TK'&  
ON"V`_dq+M  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; NNRKYdp,  
W61:$y}8  
  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; 0b2;  
eqpnh^0}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; l%`~aVGJ  
|~=4Z rcCP  
  5、 添加代码,编译运行程序。 -Q1~lN m:  
^AO2%09.S  
三、程序代码 DyQvk  
J^Wqa$<;"  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL OW8TiM mK  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ; d}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ;bq EfV0`2  
#if _MSC_VER > 1000 hiaTJE|J?  
#pragma once |G)bnmi7  
#endif // _MSC_VER > 1000 ;=8@@9  
#ifndef __AFXWIN_H__ &<C&(g{Z  
#error include 'stdafx.h' before including this file for PCH =[Tf9u QY  
#endif <"S/M]9  
#include "resource.h" // main symbols JZ-M<rcC  
class CHookApp : public CWinApp b~K-mjJI  
{ u_$Spbc]/  
 public: >k u7{1)  
  CHookApp(); mPi{:  
  // Overrides ML X: S?  
  // ClassWizard generated virtual function overrides d UiS0Qs}  
  //{{AFX_VIRTUAL(CHookApp) fy!,cK};  
 public: jLBwPI_g  
  virtual BOOL InitInstance(); o5NrDDH  
  virtual int ExitInstance(); E8We2T[^M  
  //}}AFX_VIRTUAL VF9-&HuC  
  //{{AFX_MSG(CHookApp) ||4++84{  
  // NOTE - the ClassWizard will add and remove member functions here. y(Q.uYz*  
  // DO NOT EDIT what you see in these blocks of generated code ! 3<6P^p=I  
  //}}AFX_MSG (' i_Xe  
  DECLARE_MESSAGE_MAP() 79U 7<]-!  
}; ;] #Q!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N37#V s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8V:yOq10  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0y#TGM|0D  
BOOL InitHotkey(); f=40_5a6  
BOOL UnInit(); H, O_l%  
#endif kC+dQ&@g{  
sT"{ e7;F;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. !q*]_1  
#include "stdafx.h" wW^3/  
#include "hook.h" C#.d sl  
#include <windowsx.h> B4# gT  
#ifdef _DEBUG 1 BVpv7@  
#define new DEBUG_NEW ;#?+i`9'q  
#undef THIS_FILE f@IL2DL}\  
static char THIS_FILE[] = __FILE__; GSg/I.)S  
#endif N~ M-|^L  
#define MAX_KEY 100 -Cf< #'x_  
#define CTRLBIT 0x04 YZ+<+`Mz<  
#define ALTBIT 0x02 vlZ?qIDe  
#define SHIFTBIT 0x01 4_?*@L1  
#pragma data_seg("shareddata") j'FBt8P'  
HHOOK hHook =NULL; TM$`J  
UINT nHookCount =0; )TgjaR9G  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ZlYb8+rW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT iI%"]- 0@1  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey <}Rr C#uiA  
static int KeyCount =0; ^VB_>|UN4  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -"3<Ll  
#pragma data_seg() 3 ?DM AV  
HINSTANCE hins; -o0~xspF  
void VerifyWindow(); {-\VX2:;[9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) )`]} D[j  
//{{AFX_MSG_MAP(CHookApp) T WgI-xB  
// NOTE - the ClassWizard will add and remove mapping macros here. 9Vv&\m!0  
// DO NOT EDIT what you see in these blocks of generated code! q oVp@=\:"  
//}}AFX_MSG_MAP |70L h+  
END_MESSAGE_MAP() ?QCHkhU  
Y<-dd"\  
CHookApp::CHookApp() \~ h7  
{ _}wy|T&7k&  
 // TODO: add construction code here, 4 5\%2un  
 // Place all significant initialization in InitInstance _&6&sp<n  
} d[I}+%{[  
m/W)IG>  
CHookApp theApp; %y;Cgo[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) F>A&L8  
{ |(a< b  
 BOOL bProcessed=FALSE; pUaGrdGxzQ  
 if(HC_ACTION==nCode) A ZYu/k  
 { Y>[u(q&09O  
  if((lParam&0xc0000000)==0xc0000000){// Key up H?axlRmw3  
   switch(wParam) ^ $t7p 1  
   { `;!v<@:i2  
    case VK_MENU: QK%6Ncv  
     MaskBits&=~ALTBIT; <CUe"WbE)  
     break; #x|h@(y|  
    case VK_CONTROL: ~ugK&0i[2  
     MaskBits&=~CTRLBIT; efF>kcIC  
     break; Y r^C+Oyg  
    case VK_SHIFT: NbnuQPb'  
     MaskBits&=~SHIFTBIT; 9rsty{J8  
     break; h $}&N  
    default: //judge the key and send message j*jO809%^  
     break; X6]eQ PN2  
   } gyW##M@{  
   for(int index=0;index<MAX_KEY;index++){ 2@S{e$YK`  
    if(hCallWnd[index]==NULL) CvtG  
     continue; CCZ]`*wJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) za20Y?)[  
    { we&g9j'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,kKMUshBi  
     bProcessed=TRUE; |JW-P`tL0  
    } 3M{/9rR[  
   } } .cP  
  } v1Lu.JQC$  
  else if((lParam&0xc000ffff)==1){ //Key down g^DPb pWxu  
   switch(wParam) /a$RJ6t&3  
   { wg[D*a  
    case VK_MENU: X} v]iX  
     MaskBits|=ALTBIT; RWi~34r  
     break; skn`Q>a  
    case VK_CONTROL: 3yu{Q z5y,  
     MaskBits|=CTRLBIT; S:GX!6>  
     break; EV 8}C=  
    case VK_SHIFT: D-BWgK  
     MaskBits|=SHIFTBIT; Td5;bg6Qy  
     break; VL/%D*  
    default: //judge the key and send message 0g@ 8x_3  
     break; c91rc>  
   } 5M2G ;o  
   for(int index=0;index<MAX_KEY;index++) 5? `*i"  
   { W=Ru?sG=  
    if(hCallWnd[index]==NULL) Q1Sf7)  
     continue; X,<n|zp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^ cn)eA  
    { \P_1@sH=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); eJrJ5mlI`  
     bProcessed=TRUE; S&@uY#_(*T  
    } X|F([,o  
   } hYW<4{Gjr  
  } DM%4 V|F"  
  if(!bProcessed){ =kUN ^hb  
   for(int index=0;index<MAX_KEY;index++){ b:nHcxDU<  
    if(hCallWnd[index]==NULL) i# 1:DiF  
     continue; )0P>o]fWI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .h2K$(/  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WX} "Pj/6  
   } F~dq7 AS  
  } ~)#JwY  
 } gNO<`9q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0FF x  
} Oi=>Usd  
YN ~ 7nOw  
BOOL InitHotkey() 3Q`F x  
{ &41=YnC6  
 if(hHook!=NULL){ Brh<6Btl  
  nHookCount++; b<B|p|  
  return TRUE; $*bd})y)I  
 } E+AEV`-  
 else >uuP@j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 37wm[ Z  
  if(hHook!=NULL) z&o"K\y\  
   nHookCount++; 5Y 4W:S  
  return (hHook!=NULL); 2 fX-J  
} +1 H.5|  
BOOL UnInit() ^<R*7mB*  
{ \5$N> 2kO  
 if(nHookCount>1){ _W4i?Bde  
  nHookCount--; \$2E  
  return TRUE; ki#O ^vl  
 } gg(^:`+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); w<<G}4~u|  
 if(unhooked==TRUE){ z6 v RTY  
  nHookCount=0; Eoug/we  
  hHook=NULL; ee]PFW28  
 } MX 2UYZ&  
 return unhooked; 'Lft\.C  
} EnJAHgRV;e  
jZcjiOX  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g_}r)CgG|  
{ 9KVeFl  
 BOOL bAdded=FALSE; Af:4 XSO6  
 for(int index=0;index<MAX_KEY;index++){ &>Q_  
  if(hCallWnd[index]==0){ x[3kCa|4A  
   hCallWnd[index]=hWnd; N0GID-W!/~  
   HotKey[index]=cKey; 2P8JLT*Tj  
   HotKeyMask[index]=cMask; Dcq\1V.e`W  
   bAdded=TRUE; BW}^n  
   KeyCount++; M=$y_9#  
   break; +d6/*}ht  
  } !ec\8Tj  
 } jYet!l  
 return bAdded; &%`IPhbT  
} 6>)]7(B<d  
YBN. waL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b+\jFGC%6=  
{ 0s:MEX6w|  
 BOOL bRemoved=FALSE; dZm>LVjG  
 for(int index=0;index<MAX_KEY;index++){ nJny9g  
  if(hCallWnd[index]==hWnd){ HHD4#XcU  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '+NmHu:q  
    hCallWnd[index]=NULL; K3&v6 #]  
    HotKey[index]=0; VY$hg  
    HotKeyMask[index]=0; ;8;nY6Ie  
    bRemoved=TRUE; G6xdGUM  
    KeyCount--; EN()dCQHr  
    break; BclZsU=xn  
   } -c!{';Zn  
  } 8w~I(2S:#  
 } ~zFs/(k  
 return bRemoved; Zgo^M,g  
} JY#IeNL  
vbmSbZ"y  
void VerifyWindow() fR}|CP  
{ .e5GJAW~9  
 for(int i=0;i<MAX_KEY;i++){ ;"\e aKl  
  if(hCallWnd!=NULL){ 0ANqEQX  
   if(!IsWindow(hCallWnd)){ b5 YE4h8%  
    hCallWnd=NULL; |Sy |E  
    HotKey=0; g>x2[//pk  
    HotKeyMask=0; H1f){L97wR  
    KeyCount--; 5.#r\' Z#  
   } _CP e  
  } "-kb=fY  
 }  Z $Ynar  
} UXoaUW L  
a<FzHCw  
BOOL CHookApp::InitInstance() )H#Hs<)Qy  
{ db:b%1hk:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1agyT  
 hins=AfxGetInstanceHandle(); r80w{[S$  
 InitHotkey(); *@l NL=%R  
 return CWinApp::InitInstance(); M~;mamTP  
} ZebXcT ,41  
9k ]$MR  
int CHookApp::ExitInstance() 4QdY"s( n  
{ q"'^W<i  
 VerifyWindow(); zuWj@YG\.  
 UnInit(); xj)*K%re  
 return CWinApp::ExitInstance(); ,:G.V  
} 3k5OYUk  
"8J$7g@n@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  |X`xJL  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :#"gQ^YNp  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /}r%DND'  
#if _MSC_VER > 1000 \y{Bnp5h  
#pragma once s%>>E!Qi_  
#endif // _MSC_VER > 1000 T.GY  
M5HKRLt  
class CCaptureDlg : public CDialog gzvEy^X  
{ \i}n1Qd  
 // Construction Y.3]vno?X  
 public: ~!&WK,k6  
  BOOL bTray; ]]Ypi=<'  
  BOOL bRegistered; aG8}R~wH&  
  BOOL RegisterHotkey(); 3Tg  
  UCHAR cKey; $:s1x\ol  
  UCHAR cMask; tfvX0J  
  void DeleteIcon(); 3/>McZ@OH  
  void AddIcon(); ?3kfh R  
  UINT nCount; K5z*DYT  
  void SaveBmp(); Y<X%'Wd\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor FJKt5}`8  
  // Dialog Data o8BbSZVu  
  //{{AFX_DATA(CCaptureDlg) s<H0ka@  
  enum { IDD = IDD_CAPTURE_DIALOG }; K& <|94_k  
  CComboBox m_Key; ]y@9 z b  
  BOOL m_bControl; L{ ?& .iA  
  BOOL m_bAlt; z9U<Z^4z+  
  BOOL m_bShift; mfQQ<Q@  
  CString m_Path; 2I(0EBW  
  CString m_Number; ,Ww)>O+  
  //}}AFX_DATA nM34zVy  
  // ClassWizard generated virtual function overrides OljUK,I]  
  //{{AFX_VIRTUAL(CCaptureDlg) ;FQAL@"Yj  
 public: {N[IjY  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~4'e)g.hG  
 protected: >,Zjlkh3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support u^|XQWR$:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); @>B#2t&  
  //}}AFX_VIRTUAL cBBc^SR  
  // Implementation kB_GL>fc  
 protected: (]^9>3{|  
  HICON m_hIcon; $)vljM<<  
  // Generated message map functions FF6[qSV  
  //{{AFX_MSG(CCaptureDlg) |8 c3%jve  
  virtual BOOL OnInitDialog(); wo$9$~(  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); mMjY I1F  
  afx_msg void OnPaint(); 4K[E3aA  
  afx_msg HCURSOR OnQueryDragIcon(); YwQxN"  
  virtual void OnCancel(); Cy4@\X%W  
  afx_msg void OnAbout(); Dr$k6kZ}'U  
  afx_msg void OnBrowse(); uDay||7^g  
  afx_msg void OnChange(); t@QaxZIlt;  
 //}}AFX_MSG 6E{HNPMb>  
 DECLARE_MESSAGE_MAP() IUAx*R  
}; X,:^})]  
#endif Mi,yg=V  
D5Wo e&g,  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $FZ~]Ef  
#include "stdafx.h" ]Vo;ZY_\  
#include "Capture.h" 4 FW~Y  
#include "CaptureDlg.h" %N7b XKDP  
#include <windowsx.h> eZIqyw  
#pragma comment(lib,"hook.lib") y!u)q3J0&  
#ifdef _DEBUG "yXKu)_  
#define new DEBUG_NEW lPSyFb"  
#undef THIS_FILE d+rrb>-OU  
static char THIS_FILE[] = __FILE__; d^mw&F)S  
#endif qxf!]jm  
#define IDM_SHELL WM_USER+1 EeG7 %S 5(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); & V^ Z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H)}>&Z4  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ij` %'/J  
class CAboutDlg : public CDialog 0#<q]M?hW  
{ >A|(mc  
 public: NE,2jeZQ.  
  CAboutDlg(); #wK {G)J  
  // Dialog Data vP`Sz}FU  
  //{{AFX_DATA(CAboutDlg) ST5L O#5  
  enum { IDD = IDD_ABOUTBOX }; Q&@Ls?pu  
  //}}AFX_DATA e) 42SL^s  
  // ClassWizard generated virtual function overrides f 5"1WtB  
  //{{AFX_VIRTUAL(CAboutDlg) rCGXHbj%  
 protected: $~!%Px)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support a\ fG)Fqp  
  //}}AFX_VIRTUAL C$(US8:{  
  // Implementation #3>o^cN~8k  
 protected: KV9'ew+M  
  //{{AFX_MSG(CAboutDlg) ,7KP  
  //}}AFX_MSG F&%@p&  
  DECLARE_MESSAGE_MAP() ztTj2M"  
}; _VGAh:v  
-KhNsUQk  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z0+LD  
{ Y#S<:,/sb?  
 //{{AFX_DATA_INIT(CAboutDlg) p:Ry F4{b2  
 //}}AFX_DATA_INIT ayfR{RYi  
} =5/ow!u8  
8=CdO|XV  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) "3.v(GVr  
{ kd)Q$RA(  
 CDialog::DoDataExchange(pDX); >lQ@" U  
 //{{AFX_DATA_MAP(CAboutDlg) Ok2KTsVl  
 //}}AFX_DATA_MAP 5. 5<.")  
} 0^$L{V  
x? tC2L  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 1DgR V7  
 //{{AFX_MSG_MAP(CAboutDlg) WvR-0>E  
 // No message handlers \(2w/~  
 //}}AFX_MSG_MAP I{tY;b'w  
END_MESSAGE_MAP() `-fWNHs  
;$,=VB:'  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [~*5uSG  
: CDialog(CCaptureDlg::IDD, pParent) 1AQVj]#S  
{ qmqWMLfC  
 //{{AFX_DATA_INIT(CCaptureDlg) @W6:JO  
  m_bControl = FALSE; WfpQ   
  m_bAlt = FALSE; uNCM,J!#~  
  m_bShift = FALSE; /4/'&tY  
  m_Path = _T("c:\\"); WD# 96V  
  m_Number = _T("0 picture captured."); +Ac.@!X}%  
  nCount=0; ~k\Dde  
  bRegistered=FALSE; }A jE- K{  
  bTray=FALSE; vz5x{W  
 //}}AFX_DATA_INIT p[R4!if2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Q,R>dkS  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (VD Y]Q)  
} M2H +1ic  
uonCD8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #(swVo:+E  
{ ]8q#@%v }  
 CDialog::DoDataExchange(pDX); [ )3rc}:1  
 //{{AFX_DATA_MAP(CCaptureDlg) */c4b:s  
  DDX_Control(pDX, IDC_KEY, m_Key); |y9(qcKn$  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); v+Eub;m   
  DDX_Check(pDX, IDC_ALT, m_bAlt); @~k4,dJ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]l4\Tdz  
  DDX_Text(pDX, IDC_PATH, m_Path); ]H| O  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Ipro6 I  
 //}}AFX_DATA_MAP yN[aBYJx,M  
} [NE|ZL~  
A12EUr5$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) & "i4og<  
//{{AFX_MSG_MAP(CCaptureDlg) F t/yPv  
 ON_WM_SYSCOMMAND() XSk*w'xO  
 ON_WM_PAINT() =~zsah6N  
 ON_WM_QUERYDRAGICON() =mR~\R( I  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) z]_2lx2e  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5~D(jHY;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ebno:)  
//}}AFX_MSG_MAP /2^"c+/'p  
END_MESSAGE_MAP() ;)~}/nR<a  
=LXjq~p  
BOOL CCaptureDlg::OnInitDialog() YP E1s  
{ "5<:Dj/W  
 CDialog::OnInitDialog(); ( jACLo  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |w5m2Z  
 ASSERT(IDM_ABOUTBOX < 0xF000); S[ch/  
 CMenu* pSysMenu = GetSystemMenu(FALSE); L~oy|K67  
 if (pSysMenu != NULL) "<Ozoo1&w  
 { L4O.=*P1  
  CString strAboutMenu; r{ >Q{$Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); UE9RrfdN  
  if (!strAboutMenu.IsEmpty()) W(pq_H'  
  { .~$!BWP  
   pSysMenu->AppendMenu(MF_SEPARATOR); }NjZfBQW`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /RVwhA+c  
  } lfvt9!SJ+/  
 } :HW| mqKd  
 SetIcon(m_hIcon, TRUE); // Set big icon Y5c,O>T5Y  
 SetIcon(m_hIcon, FALSE); // Set small icon R [ZY;g:p  
 m_Key.SetCurSel(0); mR|L'[l  
 RegisterHotkey(); Ml_Hq>\U  
 CMenu* pMenu=GetSystemMenu(FALSE); 9?X8H1  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); FKZ'6KM&A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yPrF2@#XZ/  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6am g*=]  
 return TRUE; // return TRUE unless you set the focus to a control _'8P8 T&  
} J':X$>E|  
r[?GO"ej5  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $RH.  
{ _(zZrUHB  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) YMN=1Zuj?  
 { fj|b;8_}l  
  CAboutDlg dlgAbout; uMx6:   
  dlgAbout.DoModal(); ?(Se$iTZ  
 } OZc4 -5  
 else }y%c.  
 { 8)lrQvZ  
  CDialog::OnSysCommand(nID, lParam); apOXcZ   
 } :KmnwYm  
} &(7=NAQsE  
dI%?uk  
void CCaptureDlg::OnPaint() 6k_Uq.<X  
{ i0:1+^3^U  
 if (IsIconic()) 7s0\`eXo/  
 { /4*Y#IpZ  
  CPaintDC dc(this); // device context for painting 2FR+Z3&z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Xh}S_/9}5  
  // Center icon in client rectangle lZAXDxhnT  
  int cxIcon = GetSystemMetrics(SM_CXICON); d-3.7nJ:  
  int cyIcon = GetSystemMetrics(SM_CYICON); /#WvC;B  
  CRect rect; V7b;qC'  
  GetClientRect(&rect); Rk,'ujc  
  int x = (rect.Width() - cxIcon + 1) / 2; Q,K$)bM  
  int y = (rect.Height() - cyIcon + 1) / 2; ({ O~O5k  
  // Draw the icon %pIP#y[4  
  dc.DrawIcon(x, y, m_hIcon); (xfh 9=.  
 } .TMLg(2hgv  
 else }* \*<d 3  
 { ,ZghV1z  
  CDialog::OnPaint(); MaPOmS8?  
 } fat;5XL@  
} 3eg6 CdT  
f8 BZkh  
HCURSOR CCaptureDlg::OnQueryDragIcon() E!'6v DVC:  
{ AsD$M*It  
 return (HCURSOR) m_hIcon; G6QD`ED  
} o%bf7)~s  
|1GOm=GNK  
void CCaptureDlg::OnCancel() 6Df*wi!jI  
{ h@E7wp1'~  
 if(bTray) c/Fgx/hr  
  DeleteIcon(); ;L,i">_%u[  
  CDialog::OnCancel(); Xp] jF^5  
} JK`$/l|7  
u^G Y7gah  
void CCaptureDlg::OnAbout() M^*\ $K%  
{ e|?eY)_  
 CAboutDlg dlg; 8>@JW]  
 dlg.DoModal(); jST4O"DjM  
} 35Fxzj $  
42~.N =2  
void CCaptureDlg::OnBrowse() 55 '  
{ j+fib} 8}  
 CString str; J5(0J7C  
 BROWSEINFO bi; iciKjXJ :  
 char name[MAX_PATH]; NRny]!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); OP<N!y?[  
 bi.hwndOwner=GetSafeHwnd(); "u]&~$  
 bi.pszDisplayName=name; GeDI\-  
 bi.lpszTitle="Select folder"; r;xy/*%Mtj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~`Rar2%B  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?JG^GD7D  
 if(idl==NULL) D2g/P8.<A  
  return; d<+hQ\BF,  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); w >2sr^!y  
 str.ReleaseBuffer(); 8\"Gs z  
 m_Path=str; obE8iG@H  
 if(str.GetAt(str.GetLength()-1)!='\\') }zks@7kf  
  m_Path+="\\"; Unv'm5/L  
 UpdateData(FALSE); L2+cVR  
} AT)b/ycC  
$|xSM2  
void CCaptureDlg::SaveBmp() n\)1Bz  
{ "w$,`M?2  
 CDC dc; *L9v(Kc  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Gbjh|j=  
 CBitmap bm; >{QO$F#  
 int Width=GetSystemMetrics(SM_CXSCREEN); 7UY4* j|[C  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5[g\.yi2_]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ' Ut4=@)  
 CDC tdc; rf-yUH]&S  
 tdc.CreateCompatibleDC(&dc); }NoP(&ebz*  
 CBitmap*pOld=tdc.SelectObject(&bm); hf]m'5pb  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .b+ix=:  
 tdc.SelectObject(pOld); i(pHJP:a:  
 BITMAP btm; 2,dWD<h  
 bm.GetBitmap(&btm); T\n6^@.>  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; E_En"r)y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /2zan}  
 BITMAPINFOHEADER bih; Pw| h`[h  
 bih.biBitCount=btm.bmBitsPixel; nj0sh"~+  
 bih.biClrImportant=0; l 9 wO x  
 bih.biClrUsed=0; yhYF "~CM  
 bih.biCompression=0; ,[IDC3.4^R  
 bih.biHeight=btm.bmHeight; Yb-{+H8{J  
 bih.biPlanes=1; zPND $3&'  
 bih.biSize=sizeof(BITMAPINFOHEADER); [nZIV  
 bih.biSizeImage=size; b~}$Ch3ymW  
 bih.biWidth=btm.bmWidth; |4g0@}nr+W  
 bih.biXPelsPerMeter=0; /W)A[jR  
 bih.biYPelsPerMeter=0; }04mJY[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); JLnv O  
 static int filecount=0; w8>h6x "  
 CString name; OtoM  
 name.Format("pict%04d.bmp",filecount++); aUzCKX%>C  
 name=m_Path+name; bq9w@O  
 BITMAPFILEHEADER bfh; tH)j EY9  
 bfh.bfReserved1=bfh.bfReserved2=0; (bQ3:%nD  
 bfh.bfType=((WORD)('M'<< 8)|'B'); p09p/  
 bfh.bfSize=54+size; 'Gqv`rq&  
 bfh.bfOffBits=54; C&>*~  
 CFile bf; @`dg:P*[  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ >xabn*Kq  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3PGAUQR#"q  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _<LL@IX  
  bf.WriteHuge(lpData,size); @U18Dj[  
  bf.Close(); MNWI%*0LO  
  nCount++; Fu_I0z  
 } w^ut,`yW R  
 GlobalFreePtr(lpData); oR&z,%0wMK  
 if(nCount==1) jtlRom}  
  m_Number.Format("%d picture captured.",nCount); *9"x0bth  
 else n V7Vc;  
  m_Number.Format("%d pictures captured.",nCount); o^vX\a?`u  
  UpdateData(FALSE); l@Vv%w9H  
} uyxYCc  
7Vsp<s9bj  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) A$3Rbn}"  
{ IO)#O<  
 if(pMsg -> message == WM_KEYDOWN) m9oOH5@K~  
 { a3<:F2=~\  
  if(pMsg -> wParam == VK_ESCAPE) @2/|rq  
   return TRUE; OIL8'xY.w  
  if(pMsg -> wParam == VK_RETURN) NDP" @  
   return TRUE; >4jE[$p]"  
 } W\k8f+Ke  
 return CDialog::PreTranslateMessage(pMsg); ?:J_+? {E  
} VwE4:/7YN  
HKXC=^}x'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +q}t%K5  
{ ##=$ $1Ki  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ IgG[Pr'D  
  SaveBmp(); bsF_.S*k@  
  return FALSE; qU7_%Z  
} iCF},W+  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Y@0'0   
 CMenu pop; SOhM6/ID2/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); e4YP$}_L  
 CMenu*pMenu=pop.GetSubMenu(0); )&c#?wx'w  
 pMenu->SetDefaultItem(ID_EXITICON); :rUMmO-  
 CPoint pt; :.,9}\LK  
 GetCursorPos(&pt); ]alc%(=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); t`"m@  
 if(id==ID_EXITICON) ]a4U\yr  
  DeleteIcon(); uqC#h,~ 0  
 else if(id==ID_EXIT) Y/kq!)u;%L  
  OnCancel(); h6 {vbYj  
 return FALSE; Nv7-6C6<  
} }+9?)f{?@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); KOS0Du  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) k0e}`#t  
 AddIcon(); e4tIO   
 return res; ki9&AFs2X  
} {siOa%;*  
,r~+ 9i0N  
void CCaptureDlg::AddIcon() >#|%'Us  
{ eo0-aHs  
 NOTIFYICONDATA data; P9bM+@5e  
 data.cbSize=sizeof(NOTIFYICONDATA); X ha9x,  
 CString tip; I "AjYv4R  
 tip.LoadString(IDS_ICONTIP); ^m w]u"5\  
 data.hIcon=GetIcon(0); v.Ba  
 data.hWnd=GetSafeHwnd(); Q?k *3A  
 strcpy(data.szTip,tip); {R!yw`#^B  
 data.uCallbackMessage=IDM_SHELL; 6P1s*u  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2'Dl$DH  
 data.uID=98; HrBJi  
 Shell_NotifyIcon(NIM_ADD,&data); )x|;%.8FX7  
 ShowWindow(SW_HIDE); -`~qmRpqY  
 bTray=TRUE; Cg): Q8  
} Af;Pl|Zh[  
s$R /!,c  
void CCaptureDlg::DeleteIcon() [Cl0Kw.LD  
{ JpC'(N  
 NOTIFYICONDATA data; :Z//  
 data.cbSize=sizeof(NOTIFYICONDATA); H2s:M  
 data.hWnd=GetSafeHwnd(); _J l(:r\%  
 data.uID=98; {Yj5Mj|#  
 Shell_NotifyIcon(NIM_DELETE,&data); OoSk^U)  
 ShowWindow(SW_SHOW); ,-#MEr  
 SetForegroundWindow(); mVZh_R=a  
 ShowWindow(SW_SHOWNORMAL); x%}D+2ro-t  
 bTray=FALSE; u#@/^h;  
} W%!(kN&d  
kh W.  
void CCaptureDlg::OnChange() zeHF-_{  
{ U>E: Ub0r  
 RegisterHotkey(); Jj-\Eb?  
} 5?k5J\+  
<k:I2LF_  
BOOL CCaptureDlg::RegisterHotkey() I\. |\^  
{ 5naFnm7%  
 UpdateData(); :<qe2Z5k  
 UCHAR mask=0; *,\"}x*  
 UCHAR key=0; @V%\Gspv  
 if(m_bControl) >!=@TK(~  
  mask|=4; UX)GA[WI  
 if(m_bAlt) _Je 4&KU  
  mask|=2; }%_|k^t  
 if(m_bShift) Zhq_ pus"a  
  mask|=1; ~rb0G*R>  
  key=Key_Table[m_Key.GetCurSel()]; P8d  
 if(bRegistered){ +~^S'6yB  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); G(&[1V%x  
  bRegistered=FALSE; ,9P-<P  
 } U**8^:*y#:  
 cMask=mask; "6f`hy  
 cKey=key; +/ukS6>gr  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {@InOo!4w]  
 return bRegistered; KZppQ0  
} ?"x4u#x  
(9]Uuvfp6"  
  四、小结 "\b>JV5  
RQ,#TbAe  
  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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