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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: Y[AL!h  
  ,}!OJyT  
  一、实现方法 / r#.BXP  
p @@TOS  
  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: 7xP>AU)y  
Epm\ =s  
#pragma data_seg("shareddata") XqVhC):  
HHOOK hHook =NULL; //钩子句柄 zcGeXX}V?  
UINT nHookCount =0; //挂接的程序数目 *rO#UE2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Y`S9mGR#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 N|c;Qzl  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey mie<jha  
static int KeyCount =0; @O}%sjC1  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 8LP L4l  
#pragma data_seg() +'abAST t  
ylF%6!V}4V  
  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。 JcEPwF.  
t\nYUL-H  
  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: ?5e:w?&g@  
3^l@!Qw  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^)&d7cSc  
cKey,UCHAR cMask) `7qZ6Z3z@  
{ n?*Fr sZ  
 BOOL bAdded=FALSE; WJ$D]7  
 for(int index=0;index<MAX_KEY;index++){ $LLkYOwI  
  if(hCallWnd[index]==0){ ~6`HJ  
   hCallWnd[index]=hWnd; &MnS( 82L  
   HotKey[index]=cKey; hjywYd]8  
   HotKeyMask[index]=cMask; LutP&Ebt8  
   bAdded=TRUE; p\66`\\l  
   KeyCount++; A+*M<W  
   break; k3::5&  
  } nZe2bai  
 } x 5vvY  
 return bAdded; ]6NpHDip1  
} ,)3%@MwO  
//删除热键 _NQMi4 V(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s(W]>Ib  
{ @l:\0cO  
 BOOL bRemoved=FALSE; 8SII>iL{  
 for(int index=0;index<MAX_KEY;index++){ ~;nh|v/e  
  if(hCallWnd[index]==hWnd){ /?<o?IR~6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ $8gj}0}eH  
    hCallWnd[index]=NULL; VWqmqR%  
    HotKey[index]=0; _]btsv\)f  
    HotKeyMask[index]=0; 2TB>d+  
    bRemoved=TRUE; {/SUfXq  
    KeyCount--; Mz,G;x}  
    break; F)_zR  
   } F]kn4zr  
  } rM/Ona2x  
 } %fB]N  
 return bRemoved; ? S^ U-.`  
} b_2bg>|;  
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c:(Xk zj  
  DLL中的钩子函数如下: g{wOq{7V  
Q-<N)K$F(4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JB.f7-  
{ yf7p,_E/  
 BOOL bProcessed=FALSE; .d{@`^dh1]  
 if(HC_ACTION==nCode) #[$^M:X.  
 { E(]39B"i  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 S"+X+Oxp7?  
   switch(wParam) g{{DC )>  
   {  vz'/]E  
    case VK_MENU: LY Y3*d  
     MaskBits&=~ALTBIT; QP HibPP:  
     break; <y4hK3wP  
    case VK_CONTROL: r6_g/7.-  
     MaskBits&=~CTRLBIT; 66ULR&D8  
     break; 4yy9m8/  
    case VK_SHIFT: 6! `^}4  
     MaskBits&=~SHIFTBIT; Eod'Esye5  
     break; j{QzD^t  
    default: //judge the key and send message t!^ j0q  
     break; ;1x(~pD*o  
   } KV&4Ep#  
   for(int index=0;index<MAX_KEY;index++){ tZ|0wPp  
    if(hCallWnd[index]==NULL) G,o5JL"t  
     continue; >~_oSC)E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P _e9>t@  
    { E~]37!,\\9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _#;UXAi  
     bProcessed=TRUE; lqaOLZH  
    } ?rauhTVnJ  
   } {N.J A=  
  } MKiP3kt8  
  else if((lParam&0xc000ffff)==1){ //有键按下 P|U9f6^3  
   switch(wParam) y6#AL<W@=  
   { +g.lLb*#  
    case VK_MENU: :X+!W_xR  
     MaskBits|=ALTBIT; <rQ+ErDA  
     break; qnO>F^itF  
    case VK_CONTROL: $X\deJ1Hi  
     MaskBits|=CTRLBIT; gXy'@ !  
     break; "+dByaY  
    case VK_SHIFT: LZ'Y3 *  
     MaskBits|=SHIFTBIT; NC @L,)F  
     break; BQo$c~  
    default: //judge the key and send message d U}kimz  
     break; Sv#S_jh  
   } g.,_E4L  
   for(int index=0;index<MAX_KEY;index++){ Bjc<d,]  
    if(hCallWnd[index]==NULL) _GW,9s^A  
     continue; vRI0fDu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $R&K-;D/8  
    { %3kS;AaA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); n[E/O}3& /  
     bProcessed=TRUE; fk5$z0/  
    } k]"DsN$  
   } S4O'N x  
  } k=&UV!J  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 :iEIo7B  
   for(int index=0;index<MAX_KEY;index++){ 3'jH,17lWV  
    if(hCallWnd[index]==NULL) !,Uzt1K:  
     continue; EK 8rV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Ne b")  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VRQD  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 9er0Ww.d  
   } !kQJ6U  
  } . UaLP  
 } s2kom)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9%iv?/o*L  
} }trQ<*D  
o,yZ1"  
  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: *|*6 q/  
L (@".{T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); HceZTe@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8{B]_: -:  
V2oXg  
  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: N2.(0 G  
phP%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) oR@1/lV  
{ H$)__V5I,q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) FCIA8^}s  
 { ?Zh,W(7W  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 1zGhX]z  
  SaveBmp(); WT'?L{  
  return FALSE; UZ-[vD1n  
 } iPK:gK3Q  
 …… //其它处理及默认处理 hOM#j  
} j<PpCL_8%  
L IN$Y  
zW:r7 P.  
  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。 As+^6  
<7*d2  
  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。 l|L ]==M  
5c 69M5  
  二、编程步骤 uGY(`  
#4Ltw ,b^  
  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"; i:n1Di1~E  
`7 3I}%?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5-! Zm]  
xY@<<  
  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; >p>B-m  
!)HB+yr  
  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; 60X))MyN  
]EfM;'j[  
  5、 添加代码,编译运行程序。 L8~zQV$h  
O`TM}  
三、程序代码 fp2uk3Bm[  
2|JtRE+  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (dHil#l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Jk_ }y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ UE 1tm  
#if _MSC_VER > 1000 +P|Z1a -jB  
#pragma once Rd ,5 &X$  
#endif // _MSC_VER > 1000 r#\Lq;+-B  
#ifndef __AFXWIN_H__ 1JY3c M  
#error include 'stdafx.h' before including this file for PCH f19'IH$n{  
#endif i _YJq;(  
#include "resource.h" // main symbols  ;GZ/V;S  
class CHookApp : public CWinApp  `s~[q  
{ 8Uoqj=5F  
 public: @!,W]?{  
  CHookApp(); ~pPj   
  // Overrides 0/fA>%&  
  // ClassWizard generated virtual function overrides NflRNu:-  
  //{{AFX_VIRTUAL(CHookApp) c+.?+g  
 public: qU+q Y2S:  
  virtual BOOL InitInstance(); ]?UK98uS\A  
  virtual int ExitInstance(); SxW.dT8{  
  //}}AFX_VIRTUAL VY j pl  
  //{{AFX_MSG(CHookApp) v 0D@`C  
  // NOTE - the ClassWizard will add and remove member functions here. MxLi'R=  
  // DO NOT EDIT what you see in these blocks of generated code ! 25/M2u?  
  //}}AFX_MSG VPUm4%?p$  
  DECLARE_MESSAGE_MAP() ?xYoCn}Z  
}; ^-dhz88wV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Km!~zG7<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /m8&E*+T1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o>@9[F,h+  
BOOL InitHotkey(); *s (L!+  
BOOL UnInit(); r 9whW;"q  
#endif LHHDD\X   
lj"72   
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. k*!f@ M  
#include "stdafx.h" C$7dmGjZ  
#include "hook.h" z~\Y*\f^Y3  
#include <windowsx.h> p[:E$#W~;  
#ifdef _DEBUG uM@ve(8\  
#define new DEBUG_NEW vl:V?-sY  
#undef THIS_FILE # mW#K  
static char THIS_FILE[] = __FILE__; z1m$8-4  
#endif nx|b9W<  
#define MAX_KEY 100 1LonYAHF  
#define CTRLBIT 0x04 1D2Yued  
#define ALTBIT 0x02 gYW  
#define SHIFTBIT 0x01 7cly{U"  
#pragma data_seg("shareddata") 3#~w#Q0%  
HHOOK hHook =NULL; SEsLJ?Dv0  
UINT nHookCount =0; 2PG= T/  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T56%3i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT TY]-L1$  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey *S] K@g  
static int KeyCount =0; +hz S'z)n&  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift IT0 [;eqR  
#pragma data_seg() 92 =huV  
HINSTANCE hins; I9g!#lbl  
void VerifyWindow(); Jpr`E&%I6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) JQk][3Rv  
//{{AFX_MSG_MAP(CHookApp) 3B3l)eX  
// NOTE - the ClassWizard will add and remove mapping macros here. 7f#r&~=  
// DO NOT EDIT what you see in these blocks of generated code! hVd PO  
//}}AFX_MSG_MAP v>E3|w%  
END_MESSAGE_MAP() J6J|&Z~UT,  
l t{yo\  
CHookApp::CHookApp() q+?>shqsZ  
{ =`fz#Mfd  
 // TODO: add construction code here, 2sOetmWE7  
 // Place all significant initialization in InitInstance uH=^ILN.  
} \. _TOE9L  
rLJjK$_x  
CHookApp theApp; :Mzkm^7B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) JmJNq$2#c  
{ Xi"<'E3_  
 BOOL bProcessed=FALSE; 5M mSQ_  
 if(HC_ACTION==nCode) @&}~r  
 { i[rXs/]  
  if((lParam&0xc0000000)==0xc0000000){// Key up OYayTKxN  
   switch(wParam) L__J(6,V2  
   { tk~<tqMq  
    case VK_MENU: r E<Ou"  
     MaskBits&=~ALTBIT; v]e6CZwo  
     break; L6IF0`M<,I  
    case VK_CONTROL: e'L$g-;>4b  
     MaskBits&=~CTRLBIT; " UxKG+   
     break; 6Cz%i 6)  
    case VK_SHIFT: M?m)<vMr*  
     MaskBits&=~SHIFTBIT; 3Q_L6Wj~  
     break; 8V(-S,  
    default: //judge the key and send message 0w<G)p~%n  
     break; xYl ScM_~  
   } 3*;S%1C^  
   for(int index=0;index<MAX_KEY;index++){ 3_cZaru  
    if(hCallWnd[index]==NULL) 8CN~o|uN  
     continue; ylVBK{w9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R@Bnrk  
    { 6gN>P%n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5"o)^8!>  
     bProcessed=TRUE; z3 Ro*yJU  
    } fkW TO"f-  
   } v dR6y  
  } ~ $QNp#dq  
  else if((lParam&0xc000ffff)==1){ //Key down `6BjNV  
   switch(wParam) G@I/Dy  
   { })^%>yLfc|  
    case VK_MENU: Ub9p&=]h  
     MaskBits|=ALTBIT; g_2EH  
     break; ewD=(yr  
    case VK_CONTROL: ;"j>k>tg  
     MaskBits|=CTRLBIT; Hb|y`Ok  
     break; ts=KAdcJ  
    case VK_SHIFT: MTUJsH\  
     MaskBits|=SHIFTBIT; ._5"FUg  
     break; +Oa+G.;)o4  
    default: //judge the key and send message WEVV2BJ  
     break; 4!^flKZQ  
   } ,a1 1&"xl  
   for(int index=0;index<MAX_KEY;index++) `-QY<STTP9  
   { 3D*vNVI  
    if(hCallWnd[index]==NULL) "? t@Y  
     continue; >+8Kl`2sw;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AKkr )VgY  
    { JC}oc M j0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _8eN^oc%  
     bProcessed=TRUE; 'v V |un(6  
    } 0b~{l;  
   } DS]C`aM9  
  }  #:st>V_h  
  if(!bProcessed){ l S m7i  
   for(int index=0;index<MAX_KEY;index++){ xY,W[?3CY  
    if(hCallWnd[index]==NULL) i$b Het  
     continue; /ig'p53jL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >t Ll|O+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QYj8c]8f  
   } bL9EX$P  
  } uxsfQ%3`#  
 } C. rLog#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); =SqI# v  
} dOfEEqPI  
f~{@(g&Gl  
BOOL InitHotkey() vx&r  
{ ZlxJY%o eu  
 if(hHook!=NULL){ B^C!UWN>%X  
  nHookCount++; Z+?V10$  
  return TRUE; rs?"pGz;  
 } d|?'yX  
 else uv$t>_^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Ebk_(Py\  
  if(hHook!=NULL) )of?!>'S[  
   nHookCount++; *4<Kz{NF  
  return (hHook!=NULL); f#3U,n8:  
} Pm* N!:u  
BOOL UnInit() FPB O=?H.  
{ 7[}K 2.W.  
 if(nHookCount>1){ !f^'-  
  nHookCount--; ,&X7D]  
  return TRUE; 8H})Dq%d7  
 } eJv_`#R&Of  
 BOOL unhooked = UnhookWindowsHookEx(hHook); &!E+l<.RF  
 if(unhooked==TRUE){ 6I yD7PQ  
  nHookCount=0; dLq)Z*r  
  hHook=NULL; Rl2*oOVz  
 } ^Cm9[1p  
 return unhooked; ;E{k+vkqy  
} j>KJgSs]&\  
]*M-8_D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ">LX>uYmX-  
{ 1aQR9zg%  
 BOOL bAdded=FALSE; ![OKmy  
 for(int index=0;index<MAX_KEY;index++){ 7Y>17=|  
  if(hCallWnd[index]==0){ GV aIZh<  
   hCallWnd[index]=hWnd; S3oSc<&2  
   HotKey[index]=cKey; vg6 ' ^5S7  
   HotKeyMask[index]=cMask; jZX2)#a!  
   bAdded=TRUE; hCcAAF*I;5  
   KeyCount++; #A RQB2V  
   break; |*w}bT(PfR  
  } nn0`A3  
 } ygA~d9"  
 return bAdded; WHM|kt  
} N7b+GqYpF>  
e{<r<]/j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'p{N5eM  
{ {d%% nK~  
 BOOL bRemoved=FALSE; H(~:Ajj+zQ  
 for(int index=0;index<MAX_KEY;index++){ ?^< E#2a  
  if(hCallWnd[index]==hWnd){ IJ`%Zh{f  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G; *jL4  
    hCallWnd[index]=NULL; PDEeb.(.  
    HotKey[index]=0; 5/ee&sJR  
    HotKeyMask[index]=0; yX'f"*  
    bRemoved=TRUE; uV@#;c4  
    KeyCount--; >)&]Ss5J  
    break; TI9]v(  
   } Hlr[x  
  } Id/-u[-yo  
 } s?irT;=  
 return bRemoved; ky^p\dMh  
} 5ZXP$.  
D[NJ{E.{  
void VerifyWindow() 1@}`dc  
{ a->;K+  
 for(int i=0;i<MAX_KEY;i++){ @Weim7r  
  if(hCallWnd!=NULL){ 4w\@D>@}H  
   if(!IsWindow(hCallWnd)){ /ehmy(zL  
    hCallWnd=NULL; ^J TrytIB  
    HotKey=0; ey~5DY7  
    HotKeyMask=0; Lcx)wof  
    KeyCount--; j<HBzqP%6  
   } 7l%]/`Y-  
  } _Prh&Q1zs  
 } srh>" 2."  
} nI_43rG:Uf  
sr=~U q{g  
BOOL CHookApp::InitInstance() gNsas:iGM  
{ @]rl2Qqe  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); nF Mc'm  
 hins=AfxGetInstanceHandle(); d=q&% gqN  
 InitHotkey(); M_+"RKp  
 return CWinApp::InitInstance(); w Bi'KS  
} $hn=MOMc  
j0XS12eM  
int CHookApp::ExitInstance() Y2j>@  
{ R0l5"l*@+  
 VerifyWindow(); _>G.  
 UnInit(); \%qzTk.&r  
 return CWinApp::ExitInstance(); TspuZR@2  
} su/!<y  
eYN =?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file w[5uX>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) /{[Y l[{"<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cL]vJ`?Ih  
#if _MSC_VER > 1000 .;1tu+S  
#pragma once *Va;ra(V2  
#endif // _MSC_VER > 1000 =Ts3O0"[  
x e~lV  
class CCaptureDlg : public CDialog Em%0C@C  
{ ZCT\4Llv#  
 // Construction G`_LD+  
 public: zmw <y2`  
  BOOL bTray; @Nm;lZK  
  BOOL bRegistered; "}ms|  
  BOOL RegisterHotkey(); 6cF~8  
  UCHAR cKey; E=H>|FgS  
  UCHAR cMask; uX!5G:x]  
  void DeleteIcon(); 5Hli@:B2s  
  void AddIcon(); y&-1SP<  
  UINT nCount; IpJMq^ Z  
  void SaveBmp(); klwC.=?(j"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor p>g5WebBN  
  // Dialog Data 4P406,T]r  
  //{{AFX_DATA(CCaptureDlg) 6ka, FjJ\  
  enum { IDD = IDD_CAPTURE_DIALOG }; 4dEfXrMf  
  CComboBox m_Key; {CO]wqEj  
  BOOL m_bControl; vDeb?n  
  BOOL m_bAlt; n0ZrgTVJ  
  BOOL m_bShift; H8'q Y  
  CString m_Path; rwJCVkF  
  CString m_Number; lR[]A  
  //}}AFX_DATA K~C6dy  
  // ClassWizard generated virtual function overrides EO_:C9=d{  
  //{{AFX_VIRTUAL(CCaptureDlg) -KuC31s_W  
 public: B"@3Qav3  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ,esryFRG  
 protected: K4G43P5q`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support kE8\\}B7  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); d7f{2  
  //}}AFX_VIRTUAL 4R(H@p%+r2  
  // Implementation 1I=>0 c  
 protected: ^5MPK@)c,/  
  HICON m_hIcon; !a.|URa7  
  // Generated message map functions wjVmK  
  //{{AFX_MSG(CCaptureDlg) @26gP:Um  
  virtual BOOL OnInitDialog(); TZl^M h[a  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V1P]mUs{1  
  afx_msg void OnPaint(); Sj[iKCEKtv  
  afx_msg HCURSOR OnQueryDragIcon(); =T?:b8yV  
  virtual void OnCancel(); tFi'RRZ  
  afx_msg void OnAbout(); v_ U$jjO1  
  afx_msg void OnBrowse(); >-%}'iz+  
  afx_msg void OnChange(); @L9C_a  
 //}}AFX_MSG pL& Zcpx  
 DECLARE_MESSAGE_MAP() xy^t_];X  
}; LA837P  
#endif mm l`,t8  
DL t"cAW  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file FQ3{~05T  
#include "stdafx.h" |[ )e5Xhd  
#include "Capture.h" NrVE[Z#  
#include "CaptureDlg.h" ]gw[ ~  
#include <windowsx.h> InAx;2'A:  
#pragma comment(lib,"hook.lib") dr[sSBTY"  
#ifdef _DEBUG ?xRx|_}e  
#define new DEBUG_NEW jDV;tEY#^  
#undef THIS_FILE P<tHqN !q  
static char THIS_FILE[] = __FILE__; 1GaM!OC9  
#endif yMd<<:Ap  
#define IDM_SHELL WM_USER+1 o#^(mGj_.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Bh#?:h&f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^%qe&Pe2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; :pp@x*uNP  
class CAboutDlg : public CDialog Fu z'!  
{ +n)_\@aQ  
 public: !jySID?q  
  CAboutDlg(); ZNKopA(=|%  
  // Dialog Data r*r3QsO  
  //{{AFX_DATA(CAboutDlg) js$L<^7  
  enum { IDD = IDD_ABOUTBOX }; EZY <k#  
  //}}AFX_DATA P,eP>55'K  
  // ClassWizard generated virtual function overrides 4eRV?tE9  
  //{{AFX_VIRTUAL(CAboutDlg) 2m*g,J?ql  
 protected: (\I9eBm  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pef)c,U$  
  //}}AFX_VIRTUAL _<8~CWo:  
  // Implementation qDV t  
 protected: cm'`u&S  
  //{{AFX_MSG(CAboutDlg) ,\Q^[e!m~  
  //}}AFX_MSG oOAn 5t@  
  DECLARE_MESSAGE_MAP() <Wwcd8d  
}; N,4. %|1  
!lnRl8oV  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) L,+m5wKj[  
{ }Z,xF`  
 //{{AFX_DATA_INIT(CAboutDlg) 0p31C7!  
 //}}AFX_DATA_INIT *6` };ASK  
} BKV,V/*p  
(*K=&e0O  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?=dp]E{  
{ MB!_G[R  
 CDialog::DoDataExchange(pDX); [wO|P{8\"  
 //{{AFX_DATA_MAP(CAboutDlg) blk4@pg  
 //}}AFX_DATA_MAP +W7#G `>  
} <b,oF]+;z  
=-m"y~{>3  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0^-1/Ec  
 //{{AFX_MSG_MAP(CAboutDlg) okkMx"  
 // No message handlers HPus/#j'+  
 //}}AFX_MSG_MAP nn?h;KzB  
END_MESSAGE_MAP() y!kU0  
[Nw%fuB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) wyi%!H  
: CDialog(CCaptureDlg::IDD, pParent) E5+-N  
{ j(>~:9I`  
 //{{AFX_DATA_INIT(CCaptureDlg) _no;B_m~  
  m_bControl = FALSE; 1zP)~p3a  
  m_bAlt = FALSE; Gpb<,v_3  
  m_bShift = FALSE; g.wDg  
  m_Path = _T("c:\\"); H5)8TR3La  
  m_Number = _T("0 picture captured."); (oxMBd+n1  
  nCount=0; 0zHMtC1 ,  
  bRegistered=FALSE; |lG7/\A  
  bTray=FALSE; J/(^Z?/~P!  
 //}}AFX_DATA_INIT w~%Rxdh?8W  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 n([9U0!gu  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )s~szmJoVD  
} /n3Qcht  
u==`]\_@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }I3m8A  
{ ; "K"S[  
 CDialog::DoDataExchange(pDX); sq45fRAi  
 //{{AFX_DATA_MAP(CCaptureDlg) !K%8tr4   
  DDX_Control(pDX, IDC_KEY, m_Key); S11ME  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  v[+ ]  
  DDX_Check(pDX, IDC_ALT, m_bAlt);  {S$61ut  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); TCLXO0  
  DDX_Text(pDX, IDC_PATH, m_Path); Pea2ENe3  
  DDX_Text(pDX, IDC_NUMBER, m_Number); @km@\w  
 //}}AFX_DATA_MAP Klj -dz  
} uf/4vz,  
2CY4nS KW  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) &~K4I  
//{{AFX_MSG_MAP(CCaptureDlg) M?ObK#l!_  
 ON_WM_SYSCOMMAND() 8:sQB% BB  
 ON_WM_PAINT() ]/6i#fTw  
 ON_WM_QUERYDRAGICON()  X? l5}  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) q\n,/#'i~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kc7,F2=F  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Kk\TW1w3  
//}}AFX_MSG_MAP n|N?[)^k  
END_MESSAGE_MAP() o FS2*u  
M/J?$j  
BOOL CCaptureDlg::OnInitDialog() }`uFLBG3  
{ fW z=bJ"V  
 CDialog::OnInitDialog(); eq6>C7.$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); VxAG= E  
 ASSERT(IDM_ABOUTBOX < 0xF000); V]5MIiNl  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $}8@?>-w  
 if (pSysMenu != NULL) UGDB4S  
 { Ow50M;E  
  CString strAboutMenu; WI6h G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); X8\UTHT& 0  
  if (!strAboutMenu.IsEmpty()) !I jU*c@  
  { Qv}TUX4  
   pSysMenu->AppendMenu(MF_SEPARATOR); EpCF/i?9:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); P\ia ?9  
  } ]RxJ^'a63  
 } ?D_^8\R  
 SetIcon(m_hIcon, TRUE); // Set big icon E;rS"'D:  
 SetIcon(m_hIcon, FALSE); // Set small icon `V2doV)  
 m_Key.SetCurSel(0); HJ+ Q7)  
 RegisterHotkey(); v83@J~  
 CMenu* pMenu=GetSystemMenu(FALSE);  Eyq4w  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fl}! V4  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :SD#>eD0  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w'6sJ#ba(  
 return TRUE; // return TRUE unless you set the focus to a control MS`XhFPS.  
} 0t(2^*I?>  
I|<`Er-;58  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) W P9PX  
{ hYbaVE  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) nt_FqUJ  
 { W+I""I*mV  
  CAboutDlg dlgAbout; bk|?>yd  
  dlgAbout.DoModal(); !<vy!pXg  
 } /d*[za'0  
 else p5aqlYb6r  
 { GDQQ4-|O  
  CDialog::OnSysCommand(nID, lParam); ) W/_2Q.  
 } Gzc`5n{"  
} V<ii  
^6QzaC3  
void CCaptureDlg::OnPaint() `b KJ  
{ KU^|T2s%  
 if (IsIconic()) :{s0tw>Z  
 { [4r<WvUaM  
  CPaintDC dc(this); // device context for painting j;J`P H  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6F_:,b^  
  // Center icon in client rectangle Zd}12HFq  
  int cxIcon = GetSystemMetrics(SM_CXICON); &EhOSu  
  int cyIcon = GetSystemMetrics(SM_CYICON); 1T}jK^"  
  CRect rect; NpH9}, 1i  
  GetClientRect(&rect); 2 b80b50  
  int x = (rect.Width() - cxIcon + 1) / 2; %)w7t[A2D  
  int y = (rect.Height() - cyIcon + 1) / 2; pv,z$3Q  
  // Draw the icon *RmD%[f  
  dc.DrawIcon(x, y, m_hIcon); K SJ Ko  
 } YQ>O6:%  
 else /5X_gjOL,  
 { #wZbG|%  
  CDialog::OnPaint(); 0|6Y% a\U  
 } a Z8f>t1Q  
} E(_lm&,4+  
84 <zTmm  
HCURSOR CCaptureDlg::OnQueryDragIcon() G2&,R{L6w  
{ }yaM.+8.  
 return (HCURSOR) m_hIcon; N, ,[V  
} 30YH}b#B  
K!8l!FFl  
void CCaptureDlg::OnCancel() pf&U$oR4  
{ N%S|Ey@f   
 if(bTray) 8~sC$sIlE  
  DeleteIcon(); p_i',5H(  
  CDialog::OnCancel(); aF[#(PF  
} Sq x'nXgO  
Te`MIR  
void CCaptureDlg::OnAbout() NNMn,J  
{ #~4;yY\$I  
 CAboutDlg dlg; LK<ZF=z]Z  
 dlg.DoModal(); IEe;ygL#  
} Ya}}a  
a@-bw4S D  
void CCaptureDlg::OnBrowse() T^ - -:1  
{ ,<$rSvMfg  
 CString str; IP^1ca#<  
 BROWSEINFO bi; 5cb8=W -  
 char name[MAX_PATH]; <Y"HC a{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); U, 8mYv2|  
 bi.hwndOwner=GetSafeHwnd(); BKV:U\QZ  
 bi.pszDisplayName=name; !AG oI7W}  
 bi.lpszTitle="Select folder"; Q$Rp?o&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :o:Z   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @O|`r(le  
 if(idl==NULL) :`c@&WF8  
  return; f?TS#jG4}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ( j:eky  
 str.ReleaseBuffer();  & [ ,*  
 m_Path=str; dM-~Qo  
 if(str.GetAt(str.GetLength()-1)!='\\') hcz!f  
  m_Path+="\\"; w,j;XPp  
 UpdateData(FALSE); ,hZ?]P&  
} y(O~=S+<  
wScr:o+K>L  
void CCaptureDlg::SaveBmp() wEw;],ur  
{ zYM0?O8pJ~  
 CDC dc; -XnOj2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 4?]s%2U6  
 CBitmap bm; -wVuM.n(Z  
 int Width=GetSystemMetrics(SM_CXSCREEN); *J{E1])<a  
 int Height=GetSystemMetrics(SM_CYSCREEN); g9Ty%|Q7(  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8tO.o\)h  
 CDC tdc; TPLv]$n  
 tdc.CreateCompatibleDC(&dc); O)"Z%B  
 CBitmap*pOld=tdc.SelectObject(&bm); 39d$B'"<1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); DPCQqV|7  
 tdc.SelectObject(pOld); 4%4Yqx )  
 BITMAP btm; ^V7)V)Z;0  
 bm.GetBitmap(&btm); |pBvy1e4)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; t^2$ent  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); wxN&k$`a  
 BITMAPINFOHEADER bih; S4rm K&  
 bih.biBitCount=btm.bmBitsPixel; DQ&\k'"\  
 bih.biClrImportant=0; Oc-ia)v1G  
 bih.biClrUsed=0; T-]UAN"O  
 bih.biCompression=0; ZZYtaVF:  
 bih.biHeight=btm.bmHeight; w_DaldK*  
 bih.biPlanes=1; s<oT,SPt  
 bih.biSize=sizeof(BITMAPINFOHEADER); PS0/O k  
 bih.biSizeImage=size; cH5RpeP  
 bih.biWidth=btm.bmWidth; 221}xhn5  
 bih.biXPelsPerMeter=0; Htfq?\ FD  
 bih.biYPelsPerMeter=0; "1`w>(=  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %-B wK  
 static int filecount=0; aimf,(+  
 CString name; [[xnp;-;  
 name.Format("pict%04d.bmp",filecount++); g?K? Fn.}  
 name=m_Path+name; Gyrc~m[$  
 BITMAPFILEHEADER bfh; PR*EyM[T  
 bfh.bfReserved1=bfh.bfReserved2=0; $M~`)UeV_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); F"QJ)F  
 bfh.bfSize=54+size; ;,7m  
 bfh.bfOffBits=54; u68ic1  
 CFile bf; c~}FYO$  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ k=G c#SD5_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nU0##  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Qz"//=hC|H  
  bf.WriteHuge(lpData,size); 0#ON}l)>  
  bf.Close(); J(A+mYr{:  
  nCount++; {:KPEN  
 } x![G'I  
 GlobalFreePtr(lpData); mo,"3YW  
 if(nCount==1) L0w2qF  
  m_Number.Format("%d picture captured.",nCount); na 0Zb  
 else mX, @yCI  
  m_Number.Format("%d pictures captured.",nCount); er2;1TW3E  
  UpdateData(FALSE); EfkBo5@Qi  
} P@x@5uC2  
K)}Vr8,V  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) # %'%LY=  
{ RRzLQ7J  
 if(pMsg -> message == WM_KEYDOWN) ~#)9Kl7<X  
 { bJkFCI/  
  if(pMsg -> wParam == VK_ESCAPE) rrq7UJ;  
   return TRUE; eLbh1L  
  if(pMsg -> wParam == VK_RETURN) a&dP@)  
   return TRUE; i[w&!mn%  
 } B9 ,  
 return CDialog::PreTranslateMessage(pMsg); 7[i&EPN  
} qD /h/  
|tz{Es<`B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _X@ Q`d  
{ 88 ca  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L(X}37  
  SaveBmp(); lQ"t#b+  
  return FALSE; P ?96;  
} Q5u3~Q'e  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O2fFh_\  
 CMenu pop; *Wcq'S  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aC<fzUD;  
 CMenu*pMenu=pop.GetSubMenu(0); 5HTY ~&C  
 pMenu->SetDefaultItem(ID_EXITICON); F=f9##Y?7M  
 CPoint pt; )i\foSbB`V  
 GetCursorPos(&pt); ldc`Y/:{  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); (a~V<v"  
 if(id==ID_EXITICON) Yp8XZ 3  
  DeleteIcon(); V8b^{}nxt  
 else if(id==ID_EXIT) 1^[]#N-Bu  
  OnCancel(); =/\l=*  
 return FALSE; *OHjw;xm+  
} ?%/*F<UVQ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); zy~*~;6tW  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^K 9jJS9K  
 AddIcon(); iR8;^C.aT  
 return res; Vg mYm~y'  
} 6;Mv)|FJF  
ej&o,gX  
void CCaptureDlg::AddIcon() :U]Pm:ivTU  
{ E/D@;Ym18  
 NOTIFYICONDATA data; vkW;qt}yO  
 data.cbSize=sizeof(NOTIFYICONDATA); 'C;KNc  
 CString tip; r4iT 9 D  
 tip.LoadString(IDS_ICONTIP); &yqk96z  
 data.hIcon=GetIcon(0); Ie8SPNY-H  
 data.hWnd=GetSafeHwnd(); Tc|+:Usy  
 strcpy(data.szTip,tip); L:jv%;DM  
 data.uCallbackMessage=IDM_SHELL; F$9+WS`c  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2%MS$Fto  
 data.uID=98; |Z$)t%'  
 Shell_NotifyIcon(NIM_ADD,&data); qSaCl6[Do  
 ShowWindow(SW_HIDE); E.^u:0:P  
 bTray=TRUE; k\ZU%"^J  
} pvRa  
s&DAO r!i  
void CCaptureDlg::DeleteIcon() dQ#oY|a  
{ H{_6e6`e.  
 NOTIFYICONDATA data; Hq,N OP  
 data.cbSize=sizeof(NOTIFYICONDATA); gV'=u z v  
 data.hWnd=GetSafeHwnd(); 7'@~TM  
 data.uID=98; tcI Z 2H%  
 Shell_NotifyIcon(NIM_DELETE,&data); t~Ic{%bdA  
 ShowWindow(SW_SHOW); ZKi?;ta=  
 SetForegroundWindow(); Yof ]  
 ShowWindow(SW_SHOWNORMAL);  AZ-JaE  
 bTray=FALSE; -or)NE  
} '47E8PIJ|  
ff aMF~+  
void CCaptureDlg::OnChange() j'UW gwB  
{ V~t; J  
 RegisterHotkey(); c{jTCkzq  
} t /lU*  
pz.fZV  
BOOL CCaptureDlg::RegisterHotkey() B""=&(Yu  
{ AO8%!+"_  
 UpdateData(); 2}5@: cwR+  
 UCHAR mask=0; YCyh+%Q(  
 UCHAR key=0; )xTu|V   
 if(m_bControl) WTZuf9:  
  mask|=4; |s!n7%|,7  
 if(m_bAlt) }IKU^0M9<T  
  mask|=2; =':B  
 if(m_bShift) F_V/&OV  
  mask|=1; w}x&wWM  
  key=Key_Table[m_Key.GetCurSel()]; [Fr <tKtB  
 if(bRegistered){ t<+gyAW  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); -?ebkHe  
  bRegistered=FALSE; @~IZ%lEQsD  
 } BqOMg$<\[  
 cMask=mask; YO;@Tj2)x  
 cKey=key; a%wa3N=v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Q*/jQC  
 return bRegistered; `QT9W-0e^  
} o7yvXrpG(U  
~VPE9D@  
  四、小结 P_M!h~  
 Lvn+EM  
  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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