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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: bf&k:.v'8  
  JwM Fu5@  
  一、实现方法 [$P.ek<  
\jGvom.  
  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: tF=Y3W+L  
?=a,  
#pragma data_seg("shareddata") TVEFZ\p<A  
HHOOK hHook =NULL; //钩子句柄 vhj^R5=  
UINT nHookCount =0; //挂接的程序数目 F\( 7B#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 T_1p1Sg  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?)V}_%fVv  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey JHIXTy__  
static int KeyCount =0; kFsq23Ne  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 U**v'%{s  
#pragma data_seg() 4C[n@ p2  
hDc)\vzr  
  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。 oYNp0Hc  
<=7N2t)s4  
  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: K`% I!Br  
@!zT+W&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cA]Ch>]A%  
cKey,UCHAR cMask) >( :b\*C  
{ Pu7cL  
 BOOL bAdded=FALSE; At=l>  
 for(int index=0;index<MAX_KEY;index++){ 2W]y9)<c  
  if(hCallWnd[index]==0){ qtLXdSc  
   hCallWnd[index]=hWnd; V- HO_GDo  
   HotKey[index]=cKey; [osm\w49  
   HotKeyMask[index]=cMask; '-k~qQk)6  
   bAdded=TRUE; P2^((c  
   KeyCount++; .ugQH<B  
   break; ~PAbtY9}U  
  } <{yQNXf[  
 } }R]^%q@&  
 return bAdded; zA?]AL(+YW  
} [d~ 25  
//删除热键  T24?1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) J4;F k  
{ ?=X_a{}/  
 BOOL bRemoved=FALSE; :\+\/HTbh  
 for(int index=0;index<MAX_KEY;index++){ ezR!ngt  
  if(hCallWnd[index]==hWnd){ %/(>>*}Kw|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \r+8}8  
    hCallWnd[index]=NULL; |~I-  
    HotKey[index]=0; 'ffOFIz|=I  
    HotKeyMask[index]=0; |L"!^Y#=D  
    bRemoved=TRUE; Rf .b_Y@O  
    KeyCount--; [6Nw)r(a(  
    break; m&X6a C'[  
   } o I6o$C  
  } 3x{2Dhi  
 } !j|93*  
 return bRemoved; H D95>%  
} rJ UXA<:2  
]A2l%V_7  
.0zNt  
  DLL中的钩子函数如下: "p{cz(  
rtM!|apr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zxr|:KC ?&  
{ =z$XqT.'  
 BOOL bProcessed=FALSE; Qy+&N*k>  
 if(HC_ACTION==nCode) >IzUn: 0F  
 { td6$w:SN,l  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Xu8_<%  
   switch(wParam) h&4f9HhS=  
   {  }7H8Y}m  
    case VK_MENU: fQB>0RR2  
     MaskBits&=~ALTBIT; P5*~ Wi`  
     break; C'c9AoE5>  
    case VK_CONTROL: p#V h[UTl^  
     MaskBits&=~CTRLBIT; mtON dI  
     break; u< ,c  
    case VK_SHIFT: bqt*d)$  
     MaskBits&=~SHIFTBIT; tsA+B&R_]  
     break; & M wvj  
    default: //judge the key and send message :z!N_]t  
     break; 4,|A\dXE  
   } 9(/ ;Wutj"  
   for(int index=0;index<MAX_KEY;index++){ Z$? Ql@M  
    if(hCallWnd[index]==NULL) YIQm;E EG  
     continue; 8,,$C7"EP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :2KLziO2  
    { 7.o:(P1??g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V~uH)IMkh7  
     bProcessed=TRUE; ]$>O--  
    } i: ZL0nH-  
   } xD(JkOne  
  } SOI$Mx  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~Zc=FP:1  
   switch(wParam) 9p#Laei].  
   { lo*)% fy  
    case VK_MENU: 1px8af]  
     MaskBits|=ALTBIT; s=+,F<;x.U  
     break; /@<Pn&Rq  
    case VK_CONTROL: L.uX  
     MaskBits|=CTRLBIT; ORV~F0d<  
     break; Qv%"iSe~J  
    case VK_SHIFT: to1{7q  
     MaskBits|=SHIFTBIT; |-HV@c]  
     break; {1Z`'.FU  
    default: //judge the key and send message $EB&]t+  
     break; k(oHmw  
   } . _5g<aw;  
   for(int index=0;index<MAX_KEY;index++){ V^P]QQ\ )  
    if(hCallWnd[index]==NULL) DB'd9<  
     continue; GIt~"X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) v: Av 2y  
    { X4:\Shb97  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); U9[ &ci  
     bProcessed=TRUE; k|$08EK $  
    } S`Jo^!VJ4  
   } :)UF#  
  } 8X@p?43  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S0\;FmLIc  
   for(int index=0;index<MAX_KEY;index++){ 7|IOn5  
    if(hCallWnd[index]==NULL) E*ug.nxy  
     continue; K 9ytot  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ^ 2"r't  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nVF?.c  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 RnN]m!"5  
   } JM-spi o  
  } cY|?iEVs)  
 } ?mJNzHrq;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); cuO)cj]@e  
} NW'rqgG  
Q2c|sK8  
  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: ccc*"_45#  
(5s$vcK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fb7Gy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0UEEvD5  
2F0@M|'  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: W0X/&v,k*  
qn VxP&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7cGc`7  
{ =/Ob kVYf  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) d`he Wv^/`  
 { Jhclg0q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 M^c`j#NQ  
  SaveBmp(); U{vt9t  
  return FALSE; +>#SB"'  
 } v=A ]#O%  
 …… //其它处理及默认处理 '~HCYE:5  
} Zl69d4vG  
?MT V!i0  
"K3"s Ec%  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 @l)HX'z0d  
"+oP((9  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 L*xu<(>K  
b'9\j.By  
  二、编程步骤 ^ lrq`1k  
(!72Eaw:]  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; zo,`Vibx<  
WoVPp*zlX  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ,f@$a3}'Lx  
"HCJ!  
  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; @6eM{3E.  
nRYHp7`  
  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; v71j1Q}6  
R?)M#^"W  
  5、 添加代码,编译运行程序。  L|hdV\  
H ?Vo#/  
三、程序代码 sN`2"t/s  
k e'aSD  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL e6E{l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v~f_~v5J!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ #k %$A}9  
#if _MSC_VER > 1000 s}8(__|  
#pragma once W(h].'N  
#endif // _MSC_VER > 1000 k[9~Er+  
#ifndef __AFXWIN_H__ u@j]U|FpY  
#error include 'stdafx.h' before including this file for PCH )HHG3cvU  
#endif ;D}8acQ  
#include "resource.h" // main symbols {MP8B'r-6  
class CHookApp : public CWinApp < Y5pAStg  
{ ^}JGWGib=+  
 public: snPM&  
  CHookApp(); C-i9F%..  
  // Overrides .lclW0*  
  // ClassWizard generated virtual function overrides oy8L{8?  
  //{{AFX_VIRTUAL(CHookApp) C|#GODA  
 public: 42*y27Dtm  
  virtual BOOL InitInstance(); x=1Iuc;&3  
  virtual int ExitInstance(); [$PW {d8|  
  //}}AFX_VIRTUAL @>>8CU^~  
  //{{AFX_MSG(CHookApp) :@BAiKa[wa  
  // NOTE - the ClassWizard will add and remove member functions here. en6Kdqe  
  // DO NOT EDIT what you see in these blocks of generated code ! 5Lmhip  
  //}}AFX_MSG F E`4%X  
  DECLARE_MESSAGE_MAP() v2OK/W,0  
}; V}?*kx~T2C  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v|IPus|>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _Xs(3V@'}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q"o* \I  
BOOL InitHotkey(); ,"MR A  
BOOL UnInit(); |;~kHc$W  
#endif 7ojU]ly  
IUB#Vdx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. vD,ZEKAN  
#include "stdafx.h" /WvF}y  
#include "hook.h" m=g\@&N  
#include <windowsx.h> 5<Ly^Na:  
#ifdef _DEBUG W 9i}w&  
#define new DEBUG_NEW L="ipM:Z  
#undef THIS_FILE h(M_ K  
static char THIS_FILE[] = __FILE__; ^^q9+0@  
#endif I-?PTr  
#define MAX_KEY 100 0\qLuF[)  
#define CTRLBIT 0x04 Z7\}x"hk  
#define ALTBIT 0x02 fN)A`>iP  
#define SHIFTBIT 0x01 ]H ze  
#pragma data_seg("shareddata") Sz!mn  
HHOOK hHook =NULL; S&yKi  
UINT nHookCount =0; ]]sy+$@~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey )4nf={iM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /wt!c?wR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ;iol 2  
static int KeyCount =0; 29a~B<e7s  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift yf > rG  
#pragma data_seg() d-GU164  
HINSTANCE hins; ,iUWLcOM  
void VerifyWindow(); A_h|f5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \nfjz\"R?b  
//{{AFX_MSG_MAP(CHookApp) !p:kEIZ)y  
// NOTE - the ClassWizard will add and remove mapping macros here. Ge'[AhA  
// DO NOT EDIT what you see in these blocks of generated code! `S`,H  
//}}AFX_MSG_MAP caG5S#8-"  
END_MESSAGE_MAP() +c7e[hz  
wSy|h*a,  
CHookApp::CHookApp() x9QUo*MT  
{ Fe r&X  
 // TODO: add construction code here, =1kE2u  
 // Place all significant initialization in InitInstance }u3Q*oAGl  
} ; 9n}P@  
%4bGI/\/  
CHookApp theApp; @2yoy&IO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S*aVcyDEP  
{ D8OW|wVE  
 BOOL bProcessed=FALSE; 71S~*"O0f  
 if(HC_ACTION==nCode) L1H k[j]X|  
 { UyFvj4SU  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0|Rt[qwKb@  
   switch(wParam) AVn?86ri  
   { M%yeI{m  
    case VK_MENU: x=S8UKUx  
     MaskBits&=~ALTBIT; G+_Q7-o&d6  
     break; 1<9=J`(H  
    case VK_CONTROL: g-C)y 06  
     MaskBits&=~CTRLBIT; ",v!geMvu  
     break; !7rk>YrY  
    case VK_SHIFT: zl]Ic' _i  
     MaskBits&=~SHIFTBIT; 5WlBe c@  
     break; =<BPoGs5  
    default: //judge the key and send message {)CN.z:O  
     break; 9Sb[5_Q  
   } M~?2g.o'D  
   for(int index=0;index<MAX_KEY;index++){ jqzG=/0~{  
    if(hCallWnd[index]==NULL) OMY^'g%w  
     continue;  T)Uhp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,(;TV_@$  
    { r(ZMZ^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cv=H6j]h |  
     bProcessed=TRUE; 6L/`  
    } +A;AX.mr  
   } su}n3NsJ  
  } J<9;Ix8R  
  else if((lParam&0xc000ffff)==1){ //Key down ov 'g'1}  
   switch(wParam) FjU -t/  
   { m=4hi(g  
    case VK_MENU:  LBIsj}e  
     MaskBits|=ALTBIT; ^~7/hm:  
     break; j^T i6F>f  
    case VK_CONTROL: 5/E7@h ,  
     MaskBits|=CTRLBIT; 2lu AF2  
     break; )N'-A p$g  
    case VK_SHIFT: it.'.aK4  
     MaskBits|=SHIFTBIT; *[|a $W  
     break; 8[B0[2O  
    default: //judge the key and send message BO%aCK&  
     break; Y& p ~8  
   } "y7IH GJ\3  
   for(int index=0;index<MAX_KEY;index++) 4!U)a  
   { .4cV X|T  
    if(hCallWnd[index]==NULL) C"*8bVx]$n  
     continue; ?*/1J~<(@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NI^jQS M]  
    { my}l?S[2d@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t_"]n*zk1  
     bProcessed=TRUE; &y+)xe:&S  
    } r.ib"W#4  
   } U)Jwo O  
  } J=?P`\h  
  if(!bProcessed){ xt zjFfq  
   for(int index=0;index<MAX_KEY;index++){ @Rw]boC  
    if(hCallWnd[index]==NULL) jU}iQM  
     continue; ]kir@NMv>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >Tp`Kri  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Zsto8wuf#  
   } DedY(JOvB  
  } 3EA+tG4KnO  
 } 9=}&evGm89  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /=@V5)  
} |44 E:pA  
C@P*:L_  
BOOL InitHotkey() 6 =H]p1p~O  
{ L;i(@tp|v  
 if(hHook!=NULL){ IJk<1T7:(W  
  nHookCount++; :\"V5  
  return TRUE; ,Zva^5  
 } O$(#gB'B  
 else vUR@P  -  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); wv.HPmq  
  if(hHook!=NULL) TMG|"|  
   nHookCount++; (&!x2M  
  return (hHook!=NULL); (7A-cC  
} d",VOhW7)S  
BOOL UnInit() O gtrp)x9  
{ j2`%sBo  
 if(nHookCount>1){ .L8g( F(=:  
  nHookCount--; L #`Vr$  
  return TRUE; ?BnX<dbi&  
 } uwc@~=;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); =5q_aK#i  
 if(unhooked==TRUE){ W690N&Wz  
  nHookCount=0; K# kMz#B+i  
  hHook=NULL; _-:CU  
 } .!)i    
 return unhooked; pnp)- a*7  
} ZkmY pi[  
^ 0g!,L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?_j]w%Hz  
{ ]T;  
 BOOL bAdded=FALSE; l\_81oZ  
 for(int index=0;index<MAX_KEY;index++){ ]-{A"tJ  
  if(hCallWnd[index]==0){ ho%G  
   hCallWnd[index]=hWnd; 4XgzNwm  
   HotKey[index]=cKey; f/vsf&^O  
   HotKeyMask[index]=cMask; .c]@xoC  
   bAdded=TRUE; I\<)9`O  
   KeyCount++; $6~t|[7:%Y  
   break; P{2j31u`  
  } i'3)5  
 } b6d}<b9#  
 return bAdded; 7qL B9r  
} M-/2{F[  
S#b)RpY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sf Zb$T J  
{ 34I;DUdcE  
 BOOL bRemoved=FALSE; g v7@4G  
 for(int index=0;index<MAX_KEY;index++){ "]}?{2i;  
  if(hCallWnd[index]==hWnd){ CE7{>pl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #b@ sV$  
    hCallWnd[index]=NULL; Gg y7xb  
    HotKey[index]=0; 8<=]4-X@  
    HotKeyMask[index]=0; IqCh4y3  
    bRemoved=TRUE; 2. f8uq  
    KeyCount--; X }Fqif4A  
    break; z,g\7F[  
   } 5Bp>*MR/".  
  } &HtG&RvQf  
 } *YP:-  
 return bRemoved; 8 Y))/]R  
} R,`3 SW()  
ltlnXjRUv  
void VerifyWindow() OWZ;X}x  
{ .RpWE.C  
 for(int i=0;i<MAX_KEY;i++){ >">grDX  
  if(hCallWnd!=NULL){ ss4YeZa  
   if(!IsWindow(hCallWnd)){ E&;;2  
    hCallWnd=NULL; XB<Q A>dLh  
    HotKey=0; P=m l;xp  
    HotKeyMask=0; `k -|G2  
    KeyCount--; a,eEP43dn  
   } h|.{dv  
  } !X\aZ{}Q  
 } kd OIL2T  
} N>IkK*v  
BeFXC5-qat  
BOOL CHookApp::InitInstance() \t]_UNGyW  
{ U nS|""  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); tja7y"(]  
 hins=AfxGetInstanceHandle(); bO+ e?&vQ%  
 InitHotkey(); LY2QKjgP  
 return CWinApp::InitInstance(); W?gelu]  
} lz4M)pL^  
#ds@!u+&  
int CHookApp::ExitInstance() 7 b 8pWM  
{ M%2w[<-8c  
 VerifyWindow(); co*XW  
 UnInit(); j/uzsu+  
 return CWinApp::ExitInstance(); a*qc  
} 87rHW@\](  
|XJ|vQGU  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2XrYm"6w  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) zKQXmyO  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c@ lH  
#if _MSC_VER > 1000 [Uw3.CVh  
#pragma once Eb p=du  
#endif // _MSC_VER > 1000 DpIk$X  
3K%_wCZ  
class CCaptureDlg : public CDialog 7)*QX,4C  
{ KMXd  
 // Construction mW1T4rR'  
 public: Hlz$@[$  
  BOOL bTray; \J6&Z13Q  
  BOOL bRegistered; r#w.y g4EX  
  BOOL RegisterHotkey(); pE 6r7  
  UCHAR cKey; @;Xa&*   
  UCHAR cMask; cG!dMab(  
  void DeleteIcon(); c3N,P<#  
  void AddIcon(); ~8EzK_c  
  UINT nCount; o)M<^b3KO  
  void SaveBmp(); Wb;D9Z  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor =QhK|C!$A  
  // Dialog Data V82hk0*j  
  //{{AFX_DATA(CCaptureDlg) (/C 8\}Ox  
  enum { IDD = IDD_CAPTURE_DIALOG }; AQ)J|i  
  CComboBox m_Key; #0c;2}D  
  BOOL m_bControl; lI;ACF^  
  BOOL m_bAlt; :`Xg0J+P  
  BOOL m_bShift; T&->xe f=  
  CString m_Path; yK0iW  
  CString m_Number; i'z (`"  
  //}}AFX_DATA cG5u$B  
  // ClassWizard generated virtual function overrides Hu"TEhW(2  
  //{{AFX_VIRTUAL(CCaptureDlg) I[P_j`aE  
 public: $ZRvvm!f  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *mkL>v &  
 protected: gaR~K  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y)b=7sU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); v_,'NA0  
  //}}AFX_VIRTUAL ._6e#=  
  // Implementation 7%5EBH &  
 protected: 9lB$i2G>Zw  
  HICON m_hIcon; ;]_h")4"c  
  // Generated message map functions U4h5K}j4  
  //{{AFX_MSG(CCaptureDlg) %(>,eee_  
  virtual BOOL OnInitDialog(); z)%]# QO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); pQk@ +r  
  afx_msg void OnPaint(); {GG;/Ns{f-  
  afx_msg HCURSOR OnQueryDragIcon(); '1b4nj|<m  
  virtual void OnCancel(); okH*2F(-  
  afx_msg void OnAbout(); VJgYXPE `  
  afx_msg void OnBrowse(); ?D=C8EX  
  afx_msg void OnChange(); 5RR4jX]  
 //}}AFX_MSG n7L|XkaQ  
 DECLARE_MESSAGE_MAP() fy={  
}; Z |<  
#endif  e,T^8_>  
qD{~QHDa  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _c,{}sn  
#include "stdafx.h" wpcqgc  
#include "Capture.h" QZFH>,d  
#include "CaptureDlg.h" 2!GyQ@&[W  
#include <windowsx.h> R,m|+[sl  
#pragma comment(lib,"hook.lib") ]p8<Vluv  
#ifdef _DEBUG zG\:#,9  
#define new DEBUG_NEW D/puK  
#undef THIS_FILE ,&s%^I+CC  
static char THIS_FILE[] = __FILE__; -(9TM*)O  
#endif I.kuYD62  
#define IDM_SHELL WM_USER+1 HrHtA]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K6N+0#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1'b}Y 8YO  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WZcAwYB  
class CAboutDlg : public CDialog UHX,s  
{ fiW2m=h_  
 public: 6/&|)gW',  
  CAboutDlg(); !G;|~|fMV  
  // Dialog Data ]4]AcJj  
  //{{AFX_DATA(CAboutDlg) =L*-2cE6#  
  enum { IDD = IDD_ABOUTBOX }; C%AN4Mo  
  //}}AFX_DATA &+ UnPE(  
  // ClassWizard generated virtual function overrides C&;m56  
  //{{AFX_VIRTUAL(CAboutDlg) _xr@dK<   
 protected: U$LI~XZM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !YX_k<1E  
  //}}AFX_VIRTUAL 9}' 92  
  // Implementation :*eJ*(M  
 protected: ]BfJ~+ N  
  //{{AFX_MSG(CAboutDlg) zh9B8r)C  
  //}}AFX_MSG SDko#  
  DECLARE_MESSAGE_MAP() s,H }km  
}; r;GAQH}j_  
DUb8 HgcV}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z4JhLef%  
{ qEfg-`*M  
 //{{AFX_DATA_INIT(CAboutDlg) cq}i)y  
 //}}AFX_DATA_INIT cRP!O|I`]  
} ow*^z78M{  
>)VWXv0  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) CQH^VTQ  
{ -lb%X 3`  
 CDialog::DoDataExchange(pDX); U+:Mu]97  
 //{{AFX_DATA_MAP(CAboutDlg) dY`P  
 //}}AFX_DATA_MAP JN3&(t  
} t!o=-k  
K9) |b`E=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) d)L,kzN  
 //{{AFX_MSG_MAP(CAboutDlg) rs,:pU  
 // No message handlers tkW7wP;  
 //}}AFX_MSG_MAP 9 !s)52qt  
END_MESSAGE_MAP() /~pB_l  
U _~r0  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8}?w %FsN#  
: CDialog(CCaptureDlg::IDD, pParent) !&pk^VFl+  
{ W$:D#;jz`h  
 //{{AFX_DATA_INIT(CCaptureDlg) p/KG{-f,  
  m_bControl = FALSE; ]*<!|;q  
  m_bAlt = FALSE; 76b2 3|  
  m_bShift = FALSE; fhmBKeFdV  
  m_Path = _T("c:\\"); LknV47vd  
  m_Number = _T("0 picture captured."); eOJ_L]y-  
  nCount=0; `bW0Va N  
  bRegistered=FALSE; )|KZGr  
  bTray=FALSE; R*VEeLx  
 //}}AFX_DATA_INIT }ni@]k#q<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HjZf3VwI  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^_k`@SU  
} rmPJid[8B~  
Wt!8.d} =  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "B*UZ.cC  
{ -* W\$ P  
 CDialog::DoDataExchange(pDX); '3 JVUHn  
 //{{AFX_DATA_MAP(CCaptureDlg) Iy Vmz'  
  DDX_Control(pDX, IDC_KEY, m_Key); lQG;WVqW  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2tZ\/6G<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); [S?`OF12  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Og?P5&C"9D  
  DDX_Text(pDX, IDC_PATH, m_Path); kcE86Y=|x!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); sq+cF/jo6  
 //}}AFX_DATA_MAP ?6 "B4%7b  
} na3lbwq  
Ie4X k  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) bDnT><eH  
//{{AFX_MSG_MAP(CCaptureDlg) Wo6C0Z3g}  
 ON_WM_SYSCOMMAND() I|_U|H!`  
 ON_WM_PAINT() h&z(;B!;y.  
 ON_WM_QUERYDRAGICON() =:m6ge@C&H  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ai;-_M+$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 3q.HZfN~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Y/qs\c+  
//}}AFX_MSG_MAP \{ff7_mLo  
END_MESSAGE_MAP() CykvTV Q  
T*](oA@  
BOOL CCaptureDlg::OnInitDialog() vxXrVPU3  
{ =/(R_BFna  
 CDialog::OnInitDialog(); wSG!.Ejc7  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J1Oe`my  
 ASSERT(IDM_ABOUTBOX < 0xF000); lSBu,UQP  
 CMenu* pSysMenu = GetSystemMenu(FALSE); y~Vl0f;  
 if (pSysMenu != NULL) O]G3l0  
 { }ssL;q  
  CString strAboutMenu; o^+g2;Ro  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +7j7zpw  
  if (!strAboutMenu.IsEmpty()) WTwura,  
  { M^0^l9w  
   pSysMenu->AppendMenu(MF_SEPARATOR); i?6#>;f  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #fq&yjl#A  
  } 7kmd.<  
 } T 5>'q;jM  
 SetIcon(m_hIcon, TRUE); // Set big icon sDjbvC0  
 SetIcon(m_hIcon, FALSE); // Set small icon n(j5dN>]  
 m_Key.SetCurSel(0); \6vr)1~N>  
 RegisterHotkey(); -8z@FLUK-  
 CMenu* pMenu=GetSystemMenu(FALSE); W.?EjEx  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pW-aX)\DR  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #f }ORA  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); _o?[0E  
 return TRUE; // return TRUE unless you set the focus to a control j~#v*qmDU  
} h:4F?'W  
wPr!.:MF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 5N$O  
{ 4td9=dNA+l  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~U1M -<IX  
 { fPab%>/T{  
  CAboutDlg dlgAbout; yX CJ?  
  dlgAbout.DoModal(); hh<ryuZ  
 } "2hs=^&8  
 else 0134mw%jk  
 { &@z M<A  
  CDialog::OnSysCommand(nID, lParam); tWA<OOl  
 } (`&E^t  
} "$e p=h+  
1.z]/cx<y  
void CCaptureDlg::OnPaint() Jf@~/!m}'  
{ Zn]!*}  
 if (IsIconic()) 9zlhJ7i  
 { [cw>; \J  
  CPaintDC dc(this); // device context for painting O{wt0 \P  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |[MtUWEW  
  // Center icon in client rectangle uex([;y  
  int cxIcon = GetSystemMetrics(SM_CXICON); EO G&Xa  
  int cyIcon = GetSystemMetrics(SM_CYICON); T49^  
  CRect rect; 5`{u! QE  
  GetClientRect(&rect); C |P(,Xp  
  int x = (rect.Width() - cxIcon + 1) / 2; \'>d.'d  
  int y = (rect.Height() - cyIcon + 1) / 2; 7-4S'rq+  
  // Draw the icon *iXaQuT  
  dc.DrawIcon(x, y, m_hIcon); DUvF  
 } SAokW,  
 else Tr "Bz!  
 { EsjZ;D, c(  
  CDialog::OnPaint(); #~`d ;MC  
 }  Z6_fI  
} 9lc{{)m2)  
Gr !@ih^  
HCURSOR CCaptureDlg::OnQueryDragIcon() )m>Y[)8!  
{ \04 (V'`U  
 return (HCURSOR) m_hIcon; s@pIcNvx  
} |J&=h|-A  
<4jqF 4 W  
void CCaptureDlg::OnCancel() pRFlmg@/}  
{ Io]KlR@!T  
 if(bTray) qw}. QwPT  
  DeleteIcon(); !]=S A &  
  CDialog::OnCancel(); 0;2ApYks  
} epxbTJfc  
bs?&;R.5  
void CCaptureDlg::OnAbout() 2;`WI:nt  
{ DQ%(X&k  
 CAboutDlg dlg; pU[5f5_  
 dlg.DoModal(); jl,>0 MA  
} !_+ok$"d  
&6\f;T4  
void CCaptureDlg::OnBrowse() ?5rM'O2  
{ TQ25"bWi  
 CString str; 0EBHR Y_F  
 BROWSEINFO bi; eD0|6P;Ei  
 char name[MAX_PATH]; 8eD/9PD=F  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); @~`:sa+H  
 bi.hwndOwner=GetSafeHwnd(); 0 1:(QJ  
 bi.pszDisplayName=name; <& iLMb:%  
 bi.lpszTitle="Select folder"; F3&:KZ!V&m  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -5<G^AS  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?T_bjALW  
 if(idl==NULL) +"JQ5~7  
  return; 30Udba+{]p  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2R~[B]2"r  
 str.ReleaseBuffer(); (n4Uc308  
 m_Path=str; &f<Ltdw  
 if(str.GetAt(str.GetLength()-1)!='\\') &-p!Lg&D  
  m_Path+="\\"; Zxn>]Z_  
 UpdateData(FALSE); 7nk3^$|  
} j:xm>X'  
uF<\|y rFt  
void CCaptureDlg::SaveBmp() YL9Tsw  
{ XrN]}S$N  
 CDC dc; vfOG(EkG.?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); z_A34@a  
 CBitmap bm; vze|*dKS  
 int Width=GetSystemMetrics(SM_CXSCREEN); T)*tCp]  
 int Height=GetSystemMetrics(SM_CYSCREEN); Q6=>*}Cm6m  
 bm.CreateCompatibleBitmap(&dc,Width,Height); \ bv JZ_  
 CDC tdc; ]h}O&K/  
 tdc.CreateCompatibleDC(&dc); hpz DQ6-Y  
 CBitmap*pOld=tdc.SelectObject(&bm); JJu}Ed_  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (zIF2qY  
 tdc.SelectObject(pOld); ]QmY`pTB`  
 BITMAP btm; 1owe'7\J  
 bm.GetBitmap(&btm); Ct386j><  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; fP;2qho  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ZG1 {"J/z  
 BITMAPINFOHEADER bih; 2GJp`2(%dA  
 bih.biBitCount=btm.bmBitsPixel; AqjEz+TVt  
 bih.biClrImportant=0; s Vg89I&  
 bih.biClrUsed=0; SaiYdJ  
 bih.biCompression=0; @S?D}myD  
 bih.biHeight=btm.bmHeight; G[\3)@I  
 bih.biPlanes=1; GFgh{'|  
 bih.biSize=sizeof(BITMAPINFOHEADER); q.v_?X<_  
 bih.biSizeImage=size; ?tf<AZ=+^L  
 bih.biWidth=btm.bmWidth; |eH*Q%M  
 bih.biXPelsPerMeter=0; tz_WxOQ0  
 bih.biYPelsPerMeter=0; 9~yp =JOV@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); a\Dw*h?b~  
 static int filecount=0; 0m'tPFQ|  
 CString name; Z~HLa  
 name.Format("pict%04d.bmp",filecount++); B}npom\tC  
 name=m_Path+name; +M.!_2t$2  
 BITMAPFILEHEADER bfh; 'T*h0xX  
 bfh.bfReserved1=bfh.bfReserved2=0; ~0Xx]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); zmh5x{US1  
 bfh.bfSize=54+size; <x\I*%(  
 bfh.bfOffBits=54;  b~Oc:  
 CFile bf; Pc=:j(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Y\{&chuF  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); H263<^   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o&Sv2"2  
  bf.WriteHuge(lpData,size); `&>CK`%Xu  
  bf.Close(); m'5rzZP  
  nCount++; <R8!fc{`  
 } Df=zrs["  
 GlobalFreePtr(lpData); A3zO&4f ]  
 if(nCount==1) `sJv?  
  m_Number.Format("%d picture captured.",nCount); n^k Uu2g|  
 else W0KSLxM  
  m_Number.Format("%d pictures captured.",nCount); E?F?)!%  
  UpdateData(FALSE); T``~YoIdz  
} -mqTlXM  
CB>O%m[1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DK }1T  
{ JsbH'l  
 if(pMsg -> message == WM_KEYDOWN) MI*@^{G  
 { HD9+4~8  
  if(pMsg -> wParam == VK_ESCAPE) Wup%.yT~Ds  
   return TRUE; h/\/dp/tt  
  if(pMsg -> wParam == VK_RETURN) >y^zagC*  
   return TRUE; ,v>| Ub,  
 } mKhlYV n  
 return CDialog::PreTranslateMessage(pMsg); ]|)M /U *  
} BZ>,Qh!J  
VU(#5X%Pn  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hwdZP=X  
{ KfMaVU=4P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j!hdi-aTU  
  SaveBmp(); k{B;J\`E;  
  return FALSE;  hPgDK.R'  
} a$h zG-  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7;H P_oAu  
 CMenu pop; L*Q#!_K0P  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); * 2s(TW  
 CMenu*pMenu=pop.GetSubMenu(0); *OMW" NZ;  
 pMenu->SetDefaultItem(ID_EXITICON); 1[H1l;  
 CPoint pt; EPL"H:o5%<  
 GetCursorPos(&pt); (X}Q'm$n\h  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <[<]+r&*  
 if(id==ID_EXITICON) pPt w(5bH  
  DeleteIcon(); +*P;Vb6D  
 else if(id==ID_EXIT) $sBje*;  
  OnCancel(); yZ57uz  
 return FALSE; lO5*n|Ic,  
} D-4\AzIb  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  TrmU  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) O7GJg;>?  
 AddIcon(); L4H5#?'  
 return res; 8cv[|`<  
} a0[Mx 4  
%!QY:[   
void CCaptureDlg::AddIcon()  *"K7<S[  
{ 'Z ,T,zW  
 NOTIFYICONDATA data; g;PZ$|%&s>  
 data.cbSize=sizeof(NOTIFYICONDATA); BSbi.@@tp  
 CString tip; T1c.ER}17  
 tip.LoadString(IDS_ICONTIP); C4/p5J  
 data.hIcon=GetIcon(0); Jb"0P`senY  
 data.hWnd=GetSafeHwnd(); 0w<qj T^U  
 strcpy(data.szTip,tip); xlU:&=|  
 data.uCallbackMessage=IDM_SHELL; =}Xw}X+[WY  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; #Yr/GNN  
 data.uID=98; 29GcNiE`T  
 Shell_NotifyIcon(NIM_ADD,&data); k4Ub+F  
 ShowWindow(SW_HIDE); H`X>  
 bTray=TRUE; TWAt)Q"J  
} ^Q""N<  
BA cnFO  
void CCaptureDlg::DeleteIcon() $Hbd:1%i {  
{ VA0p1AD  
 NOTIFYICONDATA data; @8xa"Dc  
 data.cbSize=sizeof(NOTIFYICONDATA); XZ!^kftyW  
 data.hWnd=GetSafeHwnd(); ,zU7UL^I  
 data.uID=98; WnZn$N.  
 Shell_NotifyIcon(NIM_DELETE,&data); :OvTZ ?\  
 ShowWindow(SW_SHOW); ;L.RfP"5<  
 SetForegroundWindow(); YsXf+_._  
 ShowWindow(SW_SHOWNORMAL); r>gU*bs(  
 bTray=FALSE; (jB_uMuS  
} -Rz%<`  
biw2 f~V  
void CCaptureDlg::OnChange() [n{c,U F  
{ *^b<CZd9  
 RegisterHotkey(); ;fnE"}  
} "=ogO/_Q"  
li~#6$  
BOOL CCaptureDlg::RegisterHotkey() vynchZ+g]  
{ qz2j55j   
 UpdateData(); ww(.   
 UCHAR mask=0; #_}r)q  
 UCHAR key=0; L:3  
 if(m_bControl) E3<~C(APW  
  mask|=4; mbh;oX+  
 if(m_bAlt) o$,Dh?l  
  mask|=2; <fm0B3i?  
 if(m_bShift) I3$/ #  
  mask|=1; C~#ndl Ij  
  key=Key_Table[m_Key.GetCurSel()]; :ncR7:Z  
 if(bRegistered){ jVhfpS[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1ZK~i  
  bRegistered=FALSE;  /i  
 } n:d7 Tv1Z8  
 cMask=mask; qwx{U  
 cKey=key; ^~:&/0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Y;[#~3CA  
 return bRegistered; #O2e[ E-  
} !-gjA@Pk  
3A5:D#  
  四、小结 a="\?L5  
q VcZF7  
  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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