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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: jJV1 /]TJ  
  42=/$V  
  一、实现方法 TGZr [  
e3WEsD+  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: w"q^8"j!  
:_:o%  
#pragma data_seg("shareddata") " ""pe+Y  
HHOOK hHook =NULL; //钩子句柄 KvumU>c#A  
UINT nHookCount =0; //挂接的程序数目 N=j$~,yG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 o('6,D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 df{6!}/(  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;v5Jps2^]  
static int KeyCount =0; >"[Nmx0;w  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \xKhbpO~  
#pragma data_seg() 5Un)d<!7&u  
t[:G45].-k  
  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  
$pajE^d4V  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: H^XTzE  
xiO10:L4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /0r6/ _5-.  
cKey,UCHAR cMask) +8.1cDEH\  
{ ~iJ@x;`  
 BOOL bAdded=FALSE; LJOJ2x  
 for(int index=0;index<MAX_KEY;index++){ VgO.in^q  
  if(hCallWnd[index]==0){  #]J"j]L  
   hCallWnd[index]=hWnd; ,p V3O`z  
   HotKey[index]=cKey; I^m9(L4%  
   HotKeyMask[index]=cMask; I\f\k>;  
   bAdded=TRUE; |N0RBa4%  
   KeyCount++; {2LG$x-N%  
   break; [bjP-pX  
  } aPin6L$;)  
 } MPMAFs  
 return bAdded; %:8XZf  
} K1t>5zm  
//删除热键 V U~r~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) COcS w  
{ QG 1vP.K  
 BOOL bRemoved=FALSE; g2 tM!IRQ  
 for(int index=0;index<MAX_KEY;index++){ .q'{ 3  
  if(hCallWnd[index]==hWnd){ WfYC`e7q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )D" 2Q:  
    hCallWnd[index]=NULL; )Pv B^n  
    HotKey[index]=0; _.xicov  
    HotKeyMask[index]=0; toel!+  
    bRemoved=TRUE; 8@]vvZ2/gj  
    KeyCount--; XhmUtbs  
    break; Y{<SD-ibZ$  
   } 6*s:I&  
  } CK8!7=>}^  
 } @O8X )  
 return bRemoved; c\VD8 :  
} tJpK/"R'  
9:7&`J lC#  
d_ji ..T  
  DLL中的钩子函数如下: oG=4&SQ  
+0M0g_sk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S6{u(= H  
{ h"dn:5G:=  
 BOOL bProcessed=FALSE; N a<);Pg  
 if(HC_ACTION==nCode) Mh=j^ [4Q  
 { w\ddC DZ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 0A F}wz>  
   switch(wParam)  6Ok]E`  
   {  lbC9^~T+  
    case VK_MENU: x<=R?4@rq  
     MaskBits&=~ALTBIT; g5t`YcL  
     break; .}n\c%&  
    case VK_CONTROL: sfs2kiH  
     MaskBits&=~CTRLBIT; ^=y%s  
     break; Y``]66\Fp  
    case VK_SHIFT: {Z#=ppvs  
     MaskBits&=~SHIFTBIT; $j"BHpN  
     break; \I7,1I  
    default: //judge the key and send message FvDi4[F#  
     break; Amv:dh  
   } U3|9a8^H  
   for(int index=0;index<MAX_KEY;index++){ ^<Zye>KO  
    if(hCallWnd[index]==NULL) $t.M `:G  
     continue; kNoS% ?1,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )pG*_q  
    { 98lz2d/Fcq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); /-Nq DRmJ  
     bProcessed=TRUE; <P#:dS%r  
    } [I=1   
   } F_~A8y  
  } 1B~[L 5p9  
  else if((lParam&0xc000ffff)==1){ //有键按下 5?|yYQM0tK  
   switch(wParam) hx8.  
   { Uwg*kJ3H  
    case VK_MENU: &[kFl\  
     MaskBits|=ALTBIT; %wN*Hu~E  
     break; QZFH>,d  
    case VK_CONTROL: 4}Yn!"jW&  
     MaskBits|=CTRLBIT; I[bWd{i:  
     break; ]p8<Vluv  
    case VK_SHIFT: j {Sbf04  
     MaskBits|=SHIFTBIT; &S8,-~U  
     break; ["15~9  
    default: //judge the key and send message a6 w'.]m  
     break; 9z7rv,  
   } HrHtA]  
   for(int index=0;index<MAX_KEY;index++){ b&*N  
    if(hCallWnd[index]==NULL) JwdvY]  
     continue; LQJC]*b1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bOD] `*q  
    { fiW2m=h_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6/&|)gW',  
     bProcessed=TRUE; )jm!^m  
    } z~#d@c\  
   } 9]QHwa>_|2  
  } C%AN4Mo  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &+ UnPE(  
   for(int index=0;index<MAX_KEY;index++){ C&;m56  
    if(hCallWnd[index]==NULL) bkiMF$K,K  
     continue; E6fs&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6\xfoy|j  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S.!K  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]:~z#k|2@6  
   } oVY_|UujG  
  } ~{ l @  
 } *&~ '  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ex8}./mjJ  
} *z)+'D*+  
 BF /4  
  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: -V=,x3Zew  
r}-vOPn`E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k<y~n*{_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p:3 V-$4X  
4VHX4A}CgA  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: b?k6-r$j  
eHU b4,%P  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dUkZ_<5''  
{ 7AQv4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) u^( s0q  
 { WP !u3\91  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Bs^p!4=  
  SaveBmp(); (1)b> 6  
  return FALSE; lF~!F<^9  
 } R/l/GNm  
 …… //其它处理及默认处理 hI,+J>  
}  Vsd4;  
=h[;'v{  
,D\}DJ`)C  
  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。 R{q<V uN  
wQojmmQ  
  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。 E=t^I/f)E  
JsDT  
  二、编程步骤 ]*<!|;q  
! l"*DR  
  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"; 76b2 3|  
()zn8_z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; duoM >B>8]  
B !Z~jT  
  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; Pa"[&{:  
o^Qy71Uj  
  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; '25zb+ -  
<=@6UPsn2  
  5、 添加代码,编译运行程序。 Xw&vi\*m  
CIAKXYM  
三、程序代码 $>hH{  
+{WZpP},v  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL jm,:jkr  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ZV$!dHW/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ tD> qHR  
#if _MSC_VER > 1000 6o~g3{Ow  
#pragma once Iy Vmz'  
#endif // _MSC_VER > 1000 lQG;WVqW  
#ifndef __AFXWIN_H__ L 7l"*w(  
#error include 'stdafx.h' before including this file for PCH D{^CJ :n  
#endif N\85fPSMG|  
#include "resource.h" // main symbols r=<1*u  
class CHookApp : public CWinApp Xuj=V?5  
{ 9eEA80i7  
 public: 2D4c|R@+  
  CHookApp(); O ;m[  
  // Overrides RM#.-gW   
  // ClassWizard generated virtual function overrides +Oc |Oo  
  //{{AFX_VIRTUAL(CHookApp) xOKf|  
 public: Xvxj-\ -  
  virtual BOOL InitInstance(); `$yi18F  
  virtual int ExitInstance(); GSVLZF'+  
  //}}AFX_VIRTUAL =r^Pu|  
  //{{AFX_MSG(CHookApp) A{)p#K8  
  // NOTE - the ClassWizard will add and remove member functions here. $|7;(2k  
  // DO NOT EDIT what you see in these blocks of generated code ! :xC1Ka%~  
  //}}AFX_MSG l|fb;Giq=D  
  DECLARE_MESSAGE_MAP() _7,4C?  
}; ,{BF`5bn|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); S(G&{KG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G1ED=N_#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jk1mP6'P|  
BOOL InitHotkey(); mw~$;64;a  
BOOL UnInit(); a ~F\ 2`Q  
#endif }ssL;q  
F,@uYMQs  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. pI}6AAs}Z  
#include "stdafx.h" OK%d1M^8j  
#include "hook.h" vGD D  
#include <windowsx.h> e]D TK*W~  
#ifdef _DEBUG ~2O1$ou  
#define new DEBUG_NEW m*` W&k[  
#undef THIS_FILE 'v%v*Ujf[  
static char THIS_FILE[] = __FILE__; E<77Tj  
#endif <UbLds{+Uo  
#define MAX_KEY 100 h3MZLPe  
#define CTRLBIT 0x04 ij02J`w:Ra  
#define ALTBIT 0x02 (~]0)J  
#define SHIFTBIT 0x01 `9Q O'^)  
#pragma data_seg("shareddata") ~Q+J1S]Fs  
HHOOK hHook =NULL; @%I-15Jz  
UINT nHookCount =0; j0A9;AP;;C  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey CMU\DO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j "e]Ui  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey JF(&+\i<p  
static int KeyCount =0; #=czqZw  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -"d&Ow7o  
#pragma data_seg() -x+K#T0Z  
HINSTANCE hins; d ZxrIWx  
void VerifyWindow(); MR.c?P?0Q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) f# sDG  
//{{AFX_MSG_MAP(CHookApp) Ummoph7_@  
// NOTE - the ClassWizard will add and remove mapping macros here. Y >U_l:_^  
// DO NOT EDIT what you see in these blocks of generated code! isor%R!  
//}}AFX_MSG_MAP +}Qq#^:_\  
END_MESSAGE_MAP() I?KGb:]|  
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CHookApp::CHookApp() ;bkvdn}  
{ FTcXjWBPF9  
 // TODO: add construction code here, htOVt\+!34  
 // Place all significant initialization in InitInstance $TFWum9wO  
} =S|dzgS/  
l *+9R  
CHookApp theApp; Jv59zI  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3EA`]&d>  
{ h8:5[;e  
 BOOL bProcessed=FALSE; EO G&Xa  
 if(HC_ACTION==nCode) T49^  
 { 5`{u! QE  
  if((lParam&0xc0000000)==0xc0000000){// Key up C |P(,Xp  
   switch(wParam) \'>d.'d  
   { 7-4S'rq+  
    case VK_MENU: *iXaQuT  
     MaskBits&=~ALTBIT; DUvF  
     break; SAokW,  
    case VK_CONTROL: Tr "Bz!  
     MaskBits&=~CTRLBIT; EsjZ;D, c(  
     break; #~`d ;MC  
    case VK_SHIFT: ejlau#8"  
     MaskBits&=~SHIFTBIT; ~~{+?v6B]  
     break; z{A~d  
    default: //judge the key and send message @K}Bll.E  
     break; '%KaAi$  
   } 9&'HhJm  
   for(int index=0;index<MAX_KEY;index++){ {hBnEj^@  
    if(hCallWnd[index]==NULL) PG3,MCf:  
     continue; mC./,a[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b^WF R   
    { kB]*2o9-3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b*<Fi#x1=  
     bProcessed=TRUE; Aw=GvCo<  
    } NJPp6RZ%  
   } 58gkE94  
  } 3/EJ^C  
  else if((lParam&0xc000ffff)==1){ //Key down SVqKG+{My  
   switch(wParam) eOs4c`  
   { @T&w n k  
    case VK_MENU: ; nYR~~  
     MaskBits|=ALTBIT; K# BZ Jcb  
     break; QR h %S{  
    case VK_CONTROL: !_+ok$"d  
     MaskBits|=CTRLBIT; &6\f;T4  
     break; ?5rM'O2  
    case VK_SHIFT: TQ25"bWi  
     MaskBits|=SHIFTBIT; 0EBHR Y_F  
     break; ;BW9SqlN  
    default: //judge the key and send message xv 0y?#`z  
     break; P7 R}oO_n:  
   } Q=F^Y f  
   for(int index=0;index<MAX_KEY;index++) iB3C.wd-  
   { 6(V"xjK  
    if(hCallWnd[index]==NULL) )* Rr5l /l  
     continue; ivJTE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) VMJK9|JC[  
    { 30Udba+{]p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); c<imqDf  
     bProcessed=TRUE; $c7Utm s  
    } %Hy.  
   } @+; cFj  
  } w! ':Ws  
  if(!bProcessed){ pzcof#2  
   for(int index=0;index<MAX_KEY;index++){ lCJ/@)  
    if(hCallWnd[index]==NULL) A4f;ftB  
     continue; gv/yfiA?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) RKwuvVI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u~\ NL{  
   } DXx),?s>  
  } nv%0EAa#}  
 } Jek3K&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |#x]/AXa0/  
} # &Z1d(!  
HC(o;,spO  
BOOL InitHotkey() ?<D1] Xv  
{ ky@DH(^>  
 if(hHook!=NULL){ JeU1r-i  
  nHookCount++; b%|6y  
  return TRUE; Pt?d+aBtV  
 } 4 |xQQv  
 else f(.t0{Etq  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ,Zb_Pu   
  if(hHook!=NULL) 1JF>0ijU@  
   nHookCount++; %oiA'hz;*  
  return (hHook!=NULL); vz`r !xj)  
} s^ K:cz  
BOOL UnInit() J9XV:)Yv#  
{ c}D>.x|]  
 if(nHookCount>1){ yvV]|B@sO  
  nHookCount--; 1L<X+,]@  
  return TRUE; G33'Cgo:,  
 } xqzB=0  
 BOOL unhooked = UnhookWindowsHookEx(hHook); MFs W  
 if(unhooked==TRUE){ % e1`wMa  
  nHookCount=0; E9:p A5H-j  
  hHook=NULL; }!@X(S!do  
 } Tizjh&*^  
 return unhooked; 3Qu Ft~@@  
} yrV]I(Xe  
7:X@lmBz=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bXK$H=S Bz  
{ 2hE+Om^n  
 BOOL bAdded=FALSE; Q7SRf$4  
 for(int index=0;index<MAX_KEY;index++){  b~Oc:  
  if(hCallWnd[index]==0){ vL~j6'  
   hCallWnd[index]=hWnd;  ){xMMQ5  
   HotKey[index]=cKey; & 6~AY :0r  
   HotKeyMask[index]=cMask; G-W(giF;NO  
   bAdded=TRUE; uG 7ll5Yy  
   KeyCount++; :hUt7/3c  
   break; 9Q:}VpT~nG  
  } 8M7pc{  
 } 2jH&@g$cl;  
 return bAdded; f<P>IE  
} $iOkn|~<@W  
0xpE+GY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) VMV~K7%0  
{ >@L^^ -r  
 BOOL bRemoved=FALSE; ?Fj >7  
 for(int index=0;index<MAX_KEY;index++){ yNN_}9  
  if(hCallWnd[index]==hWnd){  y jY}o  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k"J=CDP\  
    hCallWnd[index]=NULL; )*_n/^m  
    HotKey[index]=0; h"ko4b3^'@  
    HotKeyMask[index]=0; Rb_+C  
    bRemoved=TRUE; LKI2R_|n  
    KeyCount--; i-31Cxb  
    break; 8ubb~B;  
   } :qO)^~x  
  } =.f<"P51k  
 } cK H By  
 return bRemoved; 6 +x>g  
} .DZ8kKY  
y2NVx!?n  
void VerifyWindow() 7g&<ZZo  
{ #;Z+ X)  
 for(int i=0;i<MAX_KEY;i++){ _:.'\d(  
  if(hCallWnd!=NULL){ (S k+nD  
   if(!IsWindow(hCallWnd)){ a$h zG-  
    hCallWnd=NULL; 7;H P_oAu  
    HotKey=0; L*Q#!_K0P  
    HotKeyMask=0; * 2s(TW  
    KeyCount--; 0vi\o`**Mj  
   } _3 3YgO  
  } WU<C7   
 } j#JE4(&  
} tCirdwmg  
DF~{i{  
BOOL CHookApp::InitInstance() lO dw H"  
{ TH#5j.uUs  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); %<Kw  
 hins=AfxGetInstanceHandle(); D-4\AzIb  
 InitHotkey(); Vh;P,no#  
 return CWinApp::InitInstance(); ">NPp\t>/Z  
} g)#.|d+  
~4[4"Pi>|  
int CHookApp::ExitInstance() #J)83  
{ CAV Q[r5y  
 VerifyWindow();  *"K7<S[  
 UnInit(); 'Z ,T,zW  
 return CWinApp::ExitInstance(); g;PZ$|%&s>  
} BSbi.@@tp  
T1c.ER}17  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file R.B3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6qp' _?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ NlV,] $L1T  
#if _MSC_VER > 1000 F~${L+^  
#pragma once osW"b"_f  
#endif // _MSC_VER > 1000 agMI$  
;,F:.<P  
class CCaptureDlg : public CDialog CXfPC[o  
{ 3QO*1P@q  
 // Construction ql c{k/ u  
 public: iH[ .u{h  
  BOOL bTray; #ZvDf5A  
  BOOL bRegistered; T *8rR"  
  BOOL RegisterHotkey(); Uv"O'Z  
  UCHAR cKey; @8xa"Dc  
  UCHAR cMask; XZ!^kftyW  
  void DeleteIcon(); ,zU7UL^I  
  void AddIcon(); WnZn$N.  
  UINT nCount; :OvTZ ?\  
  void SaveBmp(); ;L.RfP"5<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &[iunJv:eq  
  // Dialog Data 8ECBi(  
  //{{AFX_DATA(CCaptureDlg) 8WvQ[cd  
  enum { IDD = IDD_CAPTURE_DIALOG }; v05B7^1@_  
  CComboBox m_Key; 5/"&C-t  
  BOOL m_bControl; cl3Dwrf?  
  BOOL m_bAlt; "I`g(q#Uo  
  BOOL m_bShift; wUBug  
  CString m_Path; HtbN7V/  
  CString m_Number; <764|q  
  //}}AFX_DATA yM-3nwk  
  // ClassWizard generated virtual function overrides Oe:_B/l  
  //{{AFX_VIRTUAL(CCaptureDlg) f))'8  
 public: C.}Vm};M  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }|!9aojr  
 protected: /~B \1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #+]-}v3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9#A&Qvyywg  
  //}}AFX_VIRTUAL 4x%R4tk  
  // Implementation |37y ="  
 protected: bTN0n  
  HICON m_hIcon; ?3) IzzO  
  // Generated message map functions TB  
  //{{AFX_MSG(CCaptureDlg) /WX 0}mWu  
  virtual BOOL OnInitDialog(); D%NVqk|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); BavGirCp  
  afx_msg void OnPaint(); GVl TW?5  
  afx_msg HCURSOR OnQueryDragIcon(); ui#K`.dn  
  virtual void OnCancel(); &XE eJ  
  afx_msg void OnAbout(); 4|[)D/N  
  afx_msg void OnBrowse(); qwx{U  
  afx_msg void OnChange(); v<wR`7xG  
 //}}AFX_MSG EM&;SQ;C9  
 DECLARE_MESSAGE_MAP() iYHC a }  
}; F;@A2WD  
#endif 6V@?/B  
?}g#Mc  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file G)'(%rl  
#include "stdafx.h" ;$= GrR  
#include "Capture.h" |w7D&p$  
#include "CaptureDlg.h" ~'aK[3  
#include <windowsx.h> O=LiCSNEV  
#pragma comment(lib,"hook.lib") >u)DuZXj  
#ifdef _DEBUG o}4J|@Hi|4  
#define new DEBUG_NEW UAi]hUq  
#undef THIS_FILE h-`*S&mZ  
static char THIS_FILE[] = __FILE__; WOaj_o  
#endif !WD~zZ|  
#define IDM_SHELL WM_USER+1 e}Xmb$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A>dA&'~R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kbF+aS  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; lq%6~va  
class CAboutDlg : public CDialog gvx {;e  
{ GE0,d  
 public: etHkyF  
  CAboutDlg(); A_vf3 *q  
  // Dialog Data NtnKS@Ht  
  //{{AFX_DATA(CAboutDlg) IhYTK%^96  
  enum { IDD = IDD_ABOUTBOX }; oA1d8*i^E  
  //}}AFX_DATA N=X(G(  
  // ClassWizard generated virtual function overrides 7Odw{pc  
  //{{AFX_VIRTUAL(CAboutDlg) %ut7T!Jp  
 protected: Q|`sYm'.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }1/`<m  
  //}}AFX_VIRTUAL ,9:0T LLR  
  // Implementation `p. O  
 protected: PN&;3z Z  
  //{{AFX_MSG(CAboutDlg) jdF~0#vH  
  //}}AFX_MSG ~>( N<:N  
  DECLARE_MESSAGE_MAP() 8a SH0dX  
}; T)QT_ST.9  
EhBYmc" &  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;.g <u  
{ p*^[ ~}N  
 //{{AFX_DATA_INIT(CAboutDlg) F;&a=R!.  
 //}}AFX_DATA_INIT DY~zi  
} =p lG9  
oy) 'wb~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Pd[&&!+gV  
{ itg PG  
 CDialog::DoDataExchange(pDX); ,Q5Z<\  
 //{{AFX_DATA_MAP(CAboutDlg) ^:c"%<"='  
 //}}AFX_DATA_MAP D`G ;kp  
} XtV=Gr8"  
c!{]Z_d\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) H)${"  
 //{{AFX_MSG_MAP(CAboutDlg) IO4 8sV }  
 // No message handlers < x==T4n/  
 //}}AFX_MSG_MAP 34$qV{Y%y  
END_MESSAGE_MAP() Lb>UraUvL  
$M(ZKS3,j  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Gpauy=4f  
: CDialog(CCaptureDlg::IDD, pParent) %HNe"7gk  
{ 6_w;dnVA  
 //{{AFX_DATA_INIT(CCaptureDlg) FLI0C  
  m_bControl = FALSE; )Z2l*fV  
  m_bAlt = FALSE; ?+WSYg0  
  m_bShift = FALSE; BP7&w d  
  m_Path = _T("c:\\"); y,`SLgBID  
  m_Number = _T("0 picture captured."); re `B fN  
  nCount=0; aNW!Y':*  
  bRegistered=FALSE; P}El#y#&  
  bTray=FALSE; eI 6G  
 //}}AFX_DATA_INIT u{-J?t&`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 YlY3C  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); kh'R/Dt  
} xfE:r:  
(Es0n$Xb  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N>'T"^S/  
{ d1`us G"  
 CDialog::DoDataExchange(pDX); cTR@ :sm  
 //{{AFX_DATA_MAP(CCaptureDlg) T%\f$jh6  
  DDX_Control(pDX, IDC_KEY, m_Key); 4l6+8/Y  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j/FFxlFNL  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Ba9le|c5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); .-6B6IEI_"  
  DDX_Text(pDX, IDC_PATH, m_Path); XA$Z 7_gu3  
  DDX_Text(pDX, IDC_NUMBER, m_Number); b\U p(]  
 //}}AFX_DATA_MAP f0^DsP  
} iYyJq;S   
G%V*+Ond  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) uH6QK\  
//{{AFX_MSG_MAP(CCaptureDlg) 0PK*ULwSN  
 ON_WM_SYSCOMMAND() 3r)<:4a u&  
 ON_WM_PAINT() ^_cR  
 ON_WM_QUERYDRAGICON() !/6`< eQ `  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) jNIZ!/K  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) tyH*epa nw  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {=Y.Z1E:  
//}}AFX_MSG_MAP Ny.s u?E  
END_MESSAGE_MAP() m 8Q[+_:$H  
YXR%{GUP[  
BOOL CCaptureDlg::OnInitDialog() j^g^=uau  
{ Z5vpo$l  
 CDialog::OnInitDialog(); W* XG9  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d +]Gw  
 ASSERT(IDM_ABOUTBOX < 0xF000); 8mCL3F  
 CMenu* pSysMenu = GetSystemMenu(FALSE); p&:(D=pIu  
 if (pSysMenu != NULL) -qPYm?$  
 { "uz}`G~O  
  CString strAboutMenu; ZkyH<Aa  
  strAboutMenu.LoadString(IDS_ABOUTBOX); }538vFNi  
  if (!strAboutMenu.IsEmpty()) 4mG?$kCN  
  { (>OCLmV$  
   pSysMenu->AppendMenu(MF_SEPARATOR); n 2k&yL+a  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 0V5 RZ`.  
  } y8$TU;  
 } )_bR"!Z  
 SetIcon(m_hIcon, TRUE); // Set big icon O~r.sJ}  
 SetIcon(m_hIcon, FALSE); // Set small icon +~6gP!  
 m_Key.SetCurSel(0); w2!5Cb2  
 RegisterHotkey(); 03iD(,@  
 CMenu* pMenu=GetSystemMenu(FALSE); * 7ki$f!  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &J\V !uVo  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *}t,:N;i  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); )1KlcF  
 return TRUE; // return TRUE unless you set the focus to a control 6o_t;cpT  
} TZT1nj"n  
+,xl_,Z6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |kHPk)}I]  
{ _$+lyea   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) >taC_f06  
 { #gw ys  
  CAboutDlg dlgAbout; -!dL <  
  dlgAbout.DoModal(); a!1\,.  
 } 7PDz ]i  
 else OZ*V7o  
 { B u ~N)^  
  CDialog::OnSysCommand(nID, lParam); IT3xX=|b  
 } 0 ttM_]#q  
} +%$'( t s  
vGK'U*gGD  
void CCaptureDlg::OnPaint() `YDe<@6'  
{ B rGaCja  
 if (IsIconic()) DQ{Yr>J  
 { >f [Lb|t  
  CPaintDC dc(this); // device context for painting  )"im|9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vwZrvjP2  
  // Center icon in client rectangle -?A,N,nnX  
  int cxIcon = GetSystemMetrics(SM_CXICON); 2d,q?VH$  
  int cyIcon = GetSystemMetrics(SM_CYICON); je^!W?U4<  
  CRect rect; k{/2vV[`]  
  GetClientRect(&rect); {xm^DT  
  int x = (rect.Width() - cxIcon + 1) / 2; +gG6(7&+=  
  int y = (rect.Height() - cyIcon + 1) / 2; V@0Z\&  
  // Draw the icon QMGMXa   
  dc.DrawIcon(x, y, m_hIcon); S C8r.  
 } Z7<N<  
 else : QK )Ym  
 { qwlIz/j  
  CDialog::OnPaint(); 7|A9  
 } FK MuRy|  
} RcUKe,  
E6iUa'  
HCURSOR CCaptureDlg::OnQueryDragIcon() Rh7unJ  
{ MPINxS  
 return (HCURSOR) m_hIcon; \($EYhx  
} "y_A xOH  
&;~x{q]3  
void CCaptureDlg::OnCancel() o}XbFL n  
{ `%lgT+~T  
 if(bTray) |OXufV?I  
  DeleteIcon(); ?fB}9(6  
  CDialog::OnCancel(); S7cxEOfAu  
} P +U=/$o  
26fbBt8nP  
void CCaptureDlg::OnAbout() rBv  
{ 0hTv0#j#  
 CAboutDlg dlg; >&K1+FSmyJ  
 dlg.DoModal(); i^[yGXtW  
} ,Db+c3  
,t4g^67R{  
void CCaptureDlg::OnBrowse() n3, ?klK  
{ y*,3P0*z  
 CString str; <<@vy{*Hg  
 BROWSEINFO bi; eMPk k=V  
 char name[MAX_PATH]; gl/n*s#r_  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); *5$$C&@o9  
 bi.hwndOwner=GetSafeHwnd(); M<t>jM@'A#  
 bi.pszDisplayName=name; ,LjB%f[  
 bi.lpszTitle="Select folder"; xP<cF  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; {/]Ks8`Dm  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); f n9[Li  
 if(idl==NULL) q' };.tv  
  return; p&w XRI  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); uf;^yQi  
 str.ReleaseBuffer(); GdFTKOq  
 m_Path=str; T<*i($ [  
 if(str.GetAt(str.GetLength()-1)!='\\') ~Uw **PT3M  
  m_Path+="\\"; 6,j6,Q(67  
 UpdateData(FALSE); qGtXReK  
} =;.#Bds  
eW$G1h:  
void CCaptureDlg::SaveBmp() 9QaEUy*,  
{ ,Mf@I5?  
 CDC dc; 9Ny{2m=Ye  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); \~4uEk"]  
 CBitmap bm; g:/l5~b  
 int Width=GetSystemMetrics(SM_CXSCREEN); &P>wIbE  
 int Height=GetSystemMetrics(SM_CYSCREEN); k> I;mEV  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Cj?X+#J/@d  
 CDC tdc; HH[b1z2D  
 tdc.CreateCompatibleDC(&dc); (`}O!;/E}  
 CBitmap*pOld=tdc.SelectObject(&bm); .@#i  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ShAI6j  
 tdc.SelectObject(pOld);  WDr'w'  
 BITMAP btm; lc/q0  
 bm.GetBitmap(&btm); {6YLiQ*_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Yr@)W~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ?pdvFM  
 BITMAPINFOHEADER bih; 7bioLE  
 bih.biBitCount=btm.bmBitsPixel; Ug=8:a(U.  
 bih.biClrImportant=0; t?p[w&@M2  
 bih.biClrUsed=0; KQ<pQkhv  
 bih.biCompression=0; ,?;q$Xoi  
 bih.biHeight=btm.bmHeight; riqvv1Nce  
 bih.biPlanes=1; 7_ g}t!b`  
 bih.biSize=sizeof(BITMAPINFOHEADER); 8=x{>&Jr&#  
 bih.biSizeImage=size; D T^3K5  
 bih.biWidth=btm.bmWidth; Ilvz @=  
 bih.biXPelsPerMeter=0; oXG,8NOdC  
 bih.biYPelsPerMeter=0; N%{&%C6{  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;+XiDEX0}  
 static int filecount=0; "J(#|v0  
 CString name; iivuH2/~?[  
 name.Format("pict%04d.bmp",filecount++); pX ]K-  
 name=m_Path+name; }PGl8F !  
 BITMAPFILEHEADER bfh; D\8~3S'd  
 bfh.bfReserved1=bfh.bfReserved2=0; :(EU\yCzK  
 bfh.bfType=((WORD)('M'<< 8)|'B'); x0wy3+GZc  
 bfh.bfSize=54+size; dxlaoyv:  
 bfh.bfOffBits=54; 2ul!f7#E  
 CFile bf; 7-81,ADv(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ HABMFv  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (l : ;p&[  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); SesJg~8  
  bf.WriteHuge(lpData,size); n0#HPI"  
  bf.Close(); ;wCp j9hir  
  nCount++; q: . URl  
 } E!J;bX5  
 GlobalFreePtr(lpData); H XF5fs  
 if(nCount==1) "FI]l<G&  
  m_Number.Format("%d picture captured.",nCount); GkjTE2I3  
 else -p =b5L  
  m_Number.Format("%d pictures captured.",nCount); UahFs  
  UpdateData(FALSE); 4-efnB  
} QSf{V(fs  
az3rK4g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \M M(w&  
{ :%qJAjR&  
 if(pMsg -> message == WM_KEYDOWN) rk W*C'2fz  
 { @~Z:W<X  
  if(pMsg -> wParam == VK_ESCAPE) %\-u&  
   return TRUE; Kl~jcq&z  
  if(pMsg -> wParam == VK_RETURN) rgheq<B:  
   return TRUE; weC$\st:D  
 } SLRQ3<0W_  
 return CDialog::PreTranslateMessage(pMsg); (u@p[ncN}  
} `WHP#z  
iF2/:iP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) I0oM\~#  
{ Ro`Hm8o/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nb0V~W  
  SaveBmp(); qCOe,$\1/  
  return FALSE; G@b|{!  
} cMxTv4|wui  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ OL&ku &J_  
 CMenu pop; L2Uk/E  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); TGu`r>N51  
 CMenu*pMenu=pop.GetSubMenu(0); W@jBX{k  
 pMenu->SetDefaultItem(ID_EXITICON); 5'gV_U  
 CPoint pt; 4' bup h1(  
 GetCursorPos(&pt); |RX u O  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); tn201TDZ]=  
 if(id==ID_EXITICON) j.X3SQb4G  
  DeleteIcon(); 1QXv}36#3n  
 else if(id==ID_EXIT) Ak[}s|,)  
  OnCancel(); =rcqYPul0  
 return FALSE; I?@9;0R  
} SUxz &xH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +/*,%TdQ4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \'6hv>W@  
 AddIcon(); rWEJCFa  
 return res; ~=i9]%g ?  
} ve_TpP  
1i:l  
void CCaptureDlg::AddIcon() Js[dT|>.  
{ LDHuf<`  
 NOTIFYICONDATA data; B'B,,Mz  
 data.cbSize=sizeof(NOTIFYICONDATA); FS30RP3 `/  
 CString tip; %g}ri8  
 tip.LoadString(IDS_ICONTIP); fQq'_q5  
 data.hIcon=GetIcon(0); ?"[b408-  
 data.hWnd=GetSafeHwnd(); P#bZtWx'<N  
 strcpy(data.szTip,tip); Jw?J(ig^  
 data.uCallbackMessage=IDM_SHELL; 85YE6^y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Au08k}h<G  
 data.uID=98; GB Ia Ul  
 Shell_NotifyIcon(NIM_ADD,&data); PX}YDC zP$  
 ShowWindow(SW_HIDE); !lp *0h(7  
 bTray=TRUE; Y ## ftQ  
} Oe=7z'o  
rI)op1K  
void CCaptureDlg::DeleteIcon()  Hrm^@3  
{ z/(^E8F  
 NOTIFYICONDATA data; BXy g ?  
 data.cbSize=sizeof(NOTIFYICONDATA); Fu:VRul=5$  
 data.hWnd=GetSafeHwnd(); h^ea V,x>=  
 data.uID=98; lAz.I  
 Shell_NotifyIcon(NIM_DELETE,&data); u{maE ,  
 ShowWindow(SW_SHOW); 4~=/CaG~  
 SetForegroundWindow(); V9qA.NV2  
 ShowWindow(SW_SHOWNORMAL); ,[ &@?  
 bTray=FALSE; 0q(}nv  
} EOWLGleD1  
p me5frM|  
void CCaptureDlg::OnChange() + DFG762  
{ k\X1`D}R  
 RegisterHotkey(); sui3(wb  
} q"4{GCavN  
<5 G+(vP  
BOOL CCaptureDlg::RegisterHotkey() #-kG\}  
{ >AI65g  
 UpdateData(); ;HRIB)wF  
 UCHAR mask=0; `8xt!8Z$  
 UCHAR key=0; :it52*3=  
 if(m_bControl) ] P;Ng=a  
  mask|=4; Uc]S7F#  
 if(m_bAlt) jh \L)a*  
  mask|=2; W3K?K-  
 if(m_bShift) $-'p6^5  
  mask|=1; tb#. Y  
  key=Key_Table[m_Key.GetCurSel()]; S,,,D+4  
 if(bRegistered){ [=imF^=3Vb  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); hs< )<  
  bRegistered=FALSE; ;LM`B^Q]s  
 } :G\f(2@  
 cMask=mask; n!e4"|4~z  
 cKey=key; hOjy$Z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yUcWX bT@  
 return bRegistered; Cc7PhoPK  
} ~YO99PP  
9`eu&n@Z  
  四、小结 ;2 -%IA,  
;L(2Ffk8  
  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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