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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: X3zpU7`Av+  
  T$IwrTF@?  
  一、实现方法 e. '6q ($3  
U][\|8i  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: G$oi>zt3  
/'QfLW>6  
#pragma data_seg("shareddata") Oe)B.{;Ph  
HHOOK hHook =NULL; //钩子句柄 0[In5II  
UINT nHookCount =0; //挂接的程序数目 "CY#_)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 X:kr$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;_6 CV  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0nsjihw  
static int KeyCount =0; 5Z_7Sc  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 | k?r1dj%O  
#pragma data_seg() ^W%#Elf)  
R>;m6Rb_  
  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。 U-ADdO h"q  
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  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: %f1>cO9[  
U'p-Ko#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fq<JX5DER  
cKey,UCHAR cMask) ~]V}wZt>h  
{ y*<x@i+h  
 BOOL bAdded=FALSE; Vk:] aveW  
 for(int index=0;index<MAX_KEY;index++){ <,+nS%a  
  if(hCallWnd[index]==0){ m&a 8/5  
   hCallWnd[index]=hWnd; zPc kM)  
   HotKey[index]=cKey; | IB4-p  
   HotKeyMask[index]=cMask; =berCV  
   bAdded=TRUE; YmPNaL  
   KeyCount++; C3:CuoE X  
   break; 2>*b.$g  
  } <! Z06  
 } z)F<{]%  
 return bAdded; T*{nf  
} =;(y5c  
//删除热键 B>UF dj]-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) eufGU)M  
{ NbPNcjPL  
 BOOL bRemoved=FALSE; <44A*ux  
 for(int index=0;index<MAX_KEY;index++){ ?aWMU?S  
  if(hCallWnd[index]==hWnd){ #5X535'ze  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #p7K2  
    hCallWnd[index]=NULL; T)o>U &KNP  
    HotKey[index]=0; SX]uIkw  
    HotKeyMask[index]=0; wCgi@\  
    bRemoved=TRUE; Ohn?>qQ  
    KeyCount--; "I,=L;p  
    break; n5+Z|<3)  
   } <?FkwW\ ?  
  } v}sk %f  
 } d#1yVdqRl  
 return bRemoved; 4A)@,t9+  
} oM(8'{S=  
KdXqW0nm  
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  DLL中的钩子函数如下: F3e1&aK6{  
{1;R&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;~-M$a }4  
{ $*+IsP!  
 BOOL bProcessed=FALSE; R3|r` ~@@  
 if(HC_ACTION==nCode) 7m4*dBTr  
 { { RC&Ub>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ib-H jJ8  
   switch(wParam) /Ref54  
   {  ZxB7H{  
    case VK_MENU: A/!"+Yfw  
     MaskBits&=~ALTBIT; :Z&<5  
     break; ; <l#k7/  
    case VK_CONTROL: xG WA5[YV  
     MaskBits&=~CTRLBIT; (v}4,'dS  
     break; 2rxz<ck(  
    case VK_SHIFT: J%FF@.)k  
     MaskBits&=~SHIFTBIT; *f o>  
     break; .$]-::&  
    default: //judge the key and send message :nS$cC0x*  
     break; hn=tSlte  
   } #QNa| f#=  
   for(int index=0;index<MAX_KEY;index++){ X/ lmj_v  
    if(hCallWnd[index]==NULL) K05U>151  
     continue; M(?0c}z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s63!]LDr  
    { b\S~uFq6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); fS$;~@p  
     bProcessed=TRUE; ^*"i *e  
    } w+u1"  
   } \}71p zw(  
  } PiN^/#D  
  else if((lParam&0xc000ffff)==1){ //有键按下 .Ta(v3om%  
   switch(wParam) `\$EPUM  
   { }<^QW't_Y  
    case VK_MENU: FfNUFx2N  
     MaskBits|=ALTBIT; d:pGdr& .  
     break; ly#jl5wmT  
    case VK_CONTROL: G!+Mu2  
     MaskBits|=CTRLBIT; -B& Nou  
     break; zbI|3  
    case VK_SHIFT: _FxeZ4\  
     MaskBits|=SHIFTBIT; h [@}} 6  
     break; m/3,;P.6  
    default: //judge the key and send message [\qclW;L  
     break; ?I$-im  
   } :DrF)1C  
   for(int index=0;index<MAX_KEY;index++){  <H npI  
    if(hCallWnd[index]==NULL) JwQ/A[b  
     continue; <$u\PJF7_^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bXSAZW f  
    { sC A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l b;P&V  
     bProcessed=TRUE; 6Ey@)p..E  
    } EbG&[v  
   } ]$=#:uf  
  } !t+ 3DMPn  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }T-'""*  
   for(int index=0;index<MAX_KEY;index++){ U!(es0rX  
    if(hCallWnd[index]==NULL) t.#ara{  
     continue; qOy0QZ#0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Z~].v._YV)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  OA^6l#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 c:[ ZknnCe  
   } R.cR:fA  
  } #{?~XS  
 } pzZ+!d  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KP&xk1 3)  
} E\ls- (,  
MdN0 Y@Ll  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Y?3f Fg  
l 0U23i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bz}-[W+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BOWOH  
yfal'DqKF  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 74  &q2g{  
d^f rKPB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) LmytO$?2(  
{ Sy' ]fGvx  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Gt+rVJ=v  
 { &%%ix#iF  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {A'*3(8  
  SaveBmp(); ]6F\a= J  
  return FALSE; 3YJ"[$w='(  
 } rzs-c ?  
 …… //其它处理及默认处理 U(LLIyZv  
} ujzfy  
`ZbFky{  
3I(;c ,S  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 " :f]egq -  
RD46@Q`  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 t cO{CI  
AVm+ 1  
  二、编程步骤 NWP!V@WG  
,ga6   
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; T];dFv-GT  
L ^r & .N\  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ({Pjz;xM  
~>HzAo9e  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; [Ky3WppR  
rOz1tY)l0d  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; v`{N0R  
8NiR3*1  
  5、 添加代码,编译运行程序。 \h_q]  
tbWf m5$  
三、程序代码 `<7!Rh,tS^  
u88wSe<\X  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \ H~zN]3^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) AL.psw-Il  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 3%hq<  
#if _MSC_VER > 1000 2:_6nWl  
#pragma once r fzNw  
#endif // _MSC_VER > 1000 0|J_'-<  
#ifndef __AFXWIN_H__ loO"[8i.k  
#error include 'stdafx.h' before including this file for PCH 6JDaZh"=K  
#endif zh|9\lf  
#include "resource.h" // main symbols B]@25  
class CHookApp : public CWinApp yIrJaS-  
{ &w#!   
 public: j:xC \b47"  
  CHookApp(); 6pSi-FH  
  // Overrides N0.|Mb"?t  
  // ClassWizard generated virtual function overrides DU0/if9.  
  //{{AFX_VIRTUAL(CHookApp) B6Eu."T  
 public: wapSpSt  
  virtual BOOL InitInstance(); }f]Y^>-Ux  
  virtual int ExitInstance(); 8! rdqI   
  //}}AFX_VIRTUAL .w;kB}$YC  
  //{{AFX_MSG(CHookApp) 8AX_y3$  
  // NOTE - the ClassWizard will add and remove member functions here. <S041KF.{6  
  // DO NOT EDIT what you see in these blocks of generated code ! i'7+ ?YL  
  //}}AFX_MSG ,wwO0,"y7  
  DECLARE_MESSAGE_MAP() y TD4![  
}; 6,a H[ >W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); W*t] d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wWy;dma#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~Ix2O   
BOOL InitHotkey(); ]S%(l,  
BOOL UnInit(); l6y}>]  
#endif FO5a<6  
2lCFE)  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |Ha#2pt{bc  
#include "stdafx.h" #3QPcoxa  
#include "hook.h" 8.[F3Tk=  
#include <windowsx.h> v6s,lC5qR  
#ifdef _DEBUG dF\#:[B  
#define new DEBUG_NEW V`1,s~"q  
#undef THIS_FILE -}9^$}PR  
static char THIS_FILE[] = __FILE__; d51'[?(  
#endif D2?H"PH  
#define MAX_KEY 100 )63 $,y-;$  
#define CTRLBIT 0x04 ,-4NSli  
#define ALTBIT 0x02 :-B+W9'5  
#define SHIFTBIT 0x01 4P&2Z0  
#pragma data_seg("shareddata") "FWx;65CR  
HHOOK hHook =NULL; eHuJFM  
UINT nHookCount =0; M'PZ{6;  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ]7O<|8n!d  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT W&IG,7tr  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey y %Q. (  
static int KeyCount =0; #cu{AdK  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift h 6Z:+  
#pragma data_seg() `8ac;b  
HINSTANCE hins; N)H "'#-  
void VerifyWindow(); 4b`E/L}2  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) <qwf"Ey  
//{{AFX_MSG_MAP(CHookApp) k*\Bl4g  
// NOTE - the ClassWizard will add and remove mapping macros here. S^eem_C  
// DO NOT EDIT what you see in these blocks of generated code! c]PTU2BB8  
//}}AFX_MSG_MAP q(6.VU@  
END_MESSAGE_MAP() <w{?b'/q  
YV<y-,Io  
CHookApp::CHookApp() 9%"7~YCDas  
{ ^_;'9YD  
 // TODO: add construction code here,  u]P|  
 // Place all significant initialization in InitInstance Uj):}xgi'  
} UqOBr2 UmG  
mdWA5p(  
CHookApp theApp; At'CT5=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @-'a{hBR  
{ SM2Lbfp!u  
 BOOL bProcessed=FALSE; V4:/LNq_]  
 if(HC_ACTION==nCode) ;:P4~R  
 { m2c'r3UEu  
  if((lParam&0xc0000000)==0xc0000000){// Key up fQJ`&9m*BF  
   switch(wParam) Dfs*~H 63  
   { QB*,+u4  
    case VK_MENU: H<(F$7Q!\  
     MaskBits&=~ALTBIT; Y%XF64)6  
     break; ]JrD@ Vy  
    case VK_CONTROL: {A/r)  
     MaskBits&=~CTRLBIT; EtKq.<SJ  
     break; _MBhwNBxZ  
    case VK_SHIFT: {p +&Q|  
     MaskBits&=~SHIFTBIT; %MeAa?G-#  
     break; jE\ G_>  
    default: //judge the key and send message gV2vwe  
     break; J~m$7T3Af  
   } #\0m(v  
   for(int index=0;index<MAX_KEY;index++){ x]{P.7IO'  
    if(hCallWnd[index]==NULL) Mg;pNK\n  
     continue; ^M'(/O1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U.e!:f4{  
    { c/|{yp$Ga>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *;fTiL  
     bProcessed=TRUE; ,/\`Rc^n  
    } !8H0.u rw  
   } cx\E40WD  
  } q Gk.7wf%  
  else if((lParam&0xc000ffff)==1){ //Key down FDMQ Lxf  
   switch(wParam) (Q*q# U  
   { b^/u9  
    case VK_MENU: x?Abk  
     MaskBits|=ALTBIT; ZcN0:xU  
     break; AxH;psj  
    case VK_CONTROL: O[ma% E*0  
     MaskBits|=CTRLBIT; UP-eKK'z  
     break; @t%da^-HS"  
    case VK_SHIFT: -9b=-K.y  
     MaskBits|=SHIFTBIT; ;_,jy7lf  
     break; %;[DMc/  
    default: //judge the key and send message 6] x6FeuS  
     break; OrkcY39"~a  
   } &FXf]9 _X  
   for(int index=0;index<MAX_KEY;index++) C-YYG   
   { :zHSy&i`  
    if(hCallWnd[index]==NULL) TO6F  
     continue; U,W OP7z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {7:1F)Pj  
    { |! 9~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); w <r*&  
     bProcessed=TRUE; y\FQt];z)  
    } :'[?/<iTg  
   } ,U{dqw8E{  
  } O*u   
  if(!bProcessed){ K *@?BE  
   for(int index=0;index<MAX_KEY;index++){ k79OMf<v  
    if(hCallWnd[index]==NULL) -wn-PB@r  
     continue; $H<_P'h-B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]Jswxw  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3r~8:F"g  
   } -'&l!23a~  
  } ,RPb <3 B  
 } mI&3y9; (  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7ys' [G|}r  
} MXA?rjd0  
:` SIuu~@  
BOOL InitHotkey() $<-a>~^Tp  
{ MT{1/A;`)  
 if(hHook!=NULL){ $O|Xq7dp  
  nHookCount++; qz` -?,pF  
  return TRUE; +3))G  
 } L1kn="5  
 else [vu;B4^"  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (Yy#:r;U  
  if(hHook!=NULL) 3o rSk  
   nHookCount++; =c6d $  
  return (hHook!=NULL); ]-wyZ +a  
} {MtJP:8Jp  
BOOL UnInit() b'O/u."O  
{ R~=c1bpdq  
 if(nHookCount>1){ 8$uq60JK  
  nHookCount--; C^$E#|E9N  
  return TRUE; 3cJ'tRsp<  
 } (cVIjo+::  
 BOOL unhooked = UnhookWindowsHookEx(hHook); JrBPx/?(,;  
 if(unhooked==TRUE){ Sstz_t  
  nHookCount=0; OdNo2SO  
  hHook=NULL; 5YrzOqg=  
 } ~=yU%5 s@  
 return unhooked; v} !lx)#  
} x1~AY/)v  
'l<#;{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) m+M^we*R  
{ >:.c?{%g*  
 BOOL bAdded=FALSE; DlzL(p@r  
 for(int index=0;index<MAX_KEY;index++){  D?Beg F  
  if(hCallWnd[index]==0){ D&fOZVuqZ  
   hCallWnd[index]=hWnd; W(62.3d~}?  
   HotKey[index]=cKey; HDhkg-QC  
   HotKeyMask[index]=cMask; OsOfo({I_  
   bAdded=TRUE; dsX"S;`v  
   KeyCount++; 'z9 1aNG]  
   break; p4uzw  
  } 6EY\  
 } z&9ljQ iF  
 return bAdded; m2m ;|rr  
} RSAGSGp  
Wt%Wpb8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KEy8EB  
{ :H>I`)bw  
 BOOL bRemoved=FALSE; W /v &V#  
 for(int index=0;index<MAX_KEY;index++){ vAP1PQX;  
  if(hCallWnd[index]==hWnd){ ]R~hzo  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V1,p<>9  
    hCallWnd[index]=NULL; $$$[Vn_H<  
    HotKey[index]=0; yFm88  
    HotKeyMask[index]=0; [m! P(o  
    bRemoved=TRUE; R.1.LB  
    KeyCount--; ?0 cv  
    break; fbM>jK  
   } ,OrrGwp&  
  } r5Q#GY>  
 } "Pc}-&  
 return bRemoved; J<0sT=/2$  
} {*;K>%r\o  
8i^ ./P  
void VerifyWindow() E 6#/@C,  
{ U `lp56  
 for(int i=0;i<MAX_KEY;i++){ 3ylSO73R  
  if(hCallWnd!=NULL){ ]fDb|s48  
   if(!IsWindow(hCallWnd)){ #HP-ne; #  
    hCallWnd=NULL; mY=sh{ir  
    HotKey=0; `#ff`j|a  
    HotKeyMask=0; mCn:{G8+  
    KeyCount--; 8@doKOA~T  
   } "kFNOyj3\  
  } qQf NT.  
 } tW!*W?  
} XlXt,  
\R9izuc9  
BOOL CHookApp::InitInstance() 'JgCl'k,  
{ Z molL0y  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); GfSD% "  
 hins=AfxGetInstanceHandle(); P];0,;nF  
 InitHotkey(); W2%@}IDm  
 return CWinApp::InitInstance(); 8_wh9   
} AcJrJS)~  
.(8 V  
int CHookApp::ExitInstance() .p Mwa  
{ `'3&tAy  
 VerifyWindow(); !Mgo~h"]#  
 UnInit(); Z0M,YSnz  
 return CWinApp::ExitInstance(); #" "T>+  
} oP T)vN?  
n5oX51J  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file n2_;:=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }Z\S__\9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 9,&xG\z=  
#if _MSC_VER > 1000 O46v  
#pragma once _PGd\>Ve  
#endif // _MSC_VER > 1000 p,f$9t4  
b)#rUI|O  
class CCaptureDlg : public CDialog s1sn,?  
{ %TAS4hnu%  
 // Construction 2z$!}  
 public: Z0v?3v}9^  
  BOOL bTray; _Wk*h}x  
  BOOL bRegistered; EUh_`R  
  BOOL RegisterHotkey(); F+NX [  
  UCHAR cKey; *:+ZEFMq  
  UCHAR cMask; IMM+g]#e  
  void DeleteIcon(); KSS]%66Y  
  void AddIcon(); y$di_)&g  
  UINT nCount; eB_r.R{  
  void SaveBmp(); F/1m&1t  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor o7Z 8O,;  
  // Dialog Data p(="73  
  //{{AFX_DATA(CCaptureDlg) j[mII5e7g  
  enum { IDD = IDD_CAPTURE_DIALOG }; }/\`'LQ  
  CComboBox m_Key; ShlTMTgS  
  BOOL m_bControl; Qc!3y>Y=_  
  BOOL m_bAlt; )FG/   
  BOOL m_bShift; &PApO{#Q  
  CString m_Path; Tb;,t=;u  
  CString m_Number; r| ]YS6  
  //}}AFX_DATA av5a2r0W1  
  // ClassWizard generated virtual function overrides _<F;&(o  
  //{{AFX_VIRTUAL(CCaptureDlg) !;vv-v,LQ  
 public: 9@IL547V  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Ahbh,U  
 protected: ] >w@@A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4M]l~9;A  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $B<:SuV#  
  //}}AFX_VIRTUAL O&y`:#  
  // Implementation RL\?i~'KH  
 protected: cX4]ViXSr  
  HICON m_hIcon; oclU)f.,  
  // Generated message map functions XHdhSFpm  
  //{{AFX_MSG(CCaptureDlg) MwQ4&z#wh  
  virtual BOOL OnInitDialog(); sV5") /~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 01&E.A  
  afx_msg void OnPaint(); Qm*ZOz'i  
  afx_msg HCURSOR OnQueryDragIcon(); 3` oOoKX  
  virtual void OnCancel(); fE)o-q6Z  
  afx_msg void OnAbout(); NOkgG0Z  
  afx_msg void OnBrowse(); dKD:mU",M  
  afx_msg void OnChange(); \o72VHG66  
 //}}AFX_MSG ]a uqf  
 DECLARE_MESSAGE_MAP() !J!&JQ|  
}; '3sySsD&O  
#endif %I!2dXNFRF  
'+vmC*-I(  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  h 7l>(3  
#include "stdafx.h" { J/Fp#  
#include "Capture.h" FIVC~LDd  
#include "CaptureDlg.h" olL? 6)gC  
#include <windowsx.h> WcM\4q@  
#pragma comment(lib,"hook.lib") YAeF*vP  
#ifdef _DEBUG IoK/2Gp  
#define new DEBUG_NEW eV(9I v[  
#undef THIS_FILE P,3w b  
static char THIS_FILE[] = __FILE__; Uey'c1  
#endif gJ9"$fIPc  
#define IDM_SHELL WM_USER+1 @^.W|Zh[&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,d*hhe  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wsH_pF  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; f{[0;qDJ  
class CAboutDlg : public CDialog UuF(n$B  
{ y5O &9Ckw  
 public: U~"Y8g#qgy  
  CAboutDlg(); 7m]J7 +4  
  // Dialog Data fn5-Tnsq*  
  //{{AFX_DATA(CAboutDlg) /Yg&:@L  
  enum { IDD = IDD_ABOUTBOX }; t&[<Dl/L  
  //}}AFX_DATA yf8kBT:&S  
  // ClassWizard generated virtual function overrides >}O}~$o  
  //{{AFX_VIRTUAL(CAboutDlg) M3|G^q:l  
 protected: 5E~^-wX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )$df6sq  
  //}}AFX_VIRTUAL 3/ }  
  // Implementation idX''%"  
 protected: `JPkho  
  //{{AFX_MSG(CAboutDlg) Vq{3:QBR  
  //}}AFX_MSG -<5{wQE;|  
  DECLARE_MESSAGE_MAP() r;[=y<Yf  
}; BbC O K  
woP j>M  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 3/Z>W|w#w  
{ NT5'U  
 //{{AFX_DATA_INIT(CAboutDlg) 5dE=M};v  
 //}}AFX_DATA_INIT + Hv'u  
} IOuqC.RJ}o  
kL0K[O  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) CAs:>s '8  
{ \#B<'J9.`  
 CDialog::DoDataExchange(pDX); yrfV&C%=n  
 //{{AFX_DATA_MAP(CAboutDlg) oo7}Hg>  
 //}}AFX_DATA_MAP w( XZSE  
} nQ_{IO8/6W  
Q% d1n*;+  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8 p[n>qV9  
 //{{AFX_MSG_MAP(CAboutDlg) ,J!$Q0e  
 // No message handlers ,R<9yEWm  
 //}}AFX_MSG_MAP PRTjXq6)5  
END_MESSAGE_MAP() ~eoM 2XlW  
 <9yh:1"X  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ArNQ}F/  
: CDialog(CCaptureDlg::IDD, pParent) ,#&7+e!]>P  
{ $GGaR x  
 //{{AFX_DATA_INIT(CCaptureDlg) aVc{ aP  
  m_bControl = FALSE; Ox-eB  
  m_bAlt = FALSE; 0*rD'?)K+  
  m_bShift = FALSE; }b&S3?ONt  
  m_Path = _T("c:\\"); MsP6C)dz  
  m_Number = _T("0 picture captured."); @v#P u_  
  nCount=0; 7>F{.\Z  
  bRegistered=FALSE; vI5lp5( -3  
  bTray=FALSE; DR:$urU$  
 //}}AFX_DATA_INIT |3@DCb T  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 _(kaaWJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); xSK#ovH2  
} Tsa]SN14  
mOn_#2=KF  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y*vSt^  
{ (A6~mi r!  
 CDialog::DoDataExchange(pDX); TSsZzsdr2  
 //{{AFX_DATA_MAP(CCaptureDlg) /YF:WKr2  
  DDX_Control(pDX, IDC_KEY, m_Key); bD:0k.`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl);  L1 /`/  
  DDX_Check(pDX, IDC_ALT, m_bAlt); f6`GU$H  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); }P fAf  
  DDX_Text(pDX, IDC_PATH, m_Path); /+SLq`'u)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 9iZio3m  
 //}}AFX_DATA_MAP Xzf,S;XV~  
} 0x!&>  
k_0@,b 3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %sr- xE  
//{{AFX_MSG_MAP(CCaptureDlg) y3s+.5;  
 ON_WM_SYSCOMMAND() 'Uf?-t*LT@  
 ON_WM_PAINT() yivu|q  
 ON_WM_QUERYDRAGICON() %(lO>4>|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) LtMM89u  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Ls9NQy  
 ON_BN_CLICKED(ID_CHANGE, OnChange) qVE0[ve  
//}}AFX_MSG_MAP "yaxHd  
END_MESSAGE_MAP() SXOAa<u5  
o" ,8   
BOOL CCaptureDlg::OnInitDialog() x2#JD|0  
{ p#ar`-vQ  
 CDialog::OnInitDialog(); `<X-3)>;G  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tZ9i/=S  
 ASSERT(IDM_ABOUTBOX < 0xF000); mSxn7LG  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ?s^3 o{!<W  
 if (pSysMenu != NULL) YoKyiO!   
 { &S*~EM.l8  
  CString strAboutMenu; UlE%\L0GD&  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &HM-UC|  
  if (!strAboutMenu.IsEmpty()) X&qx4 DL  
  { PWpt\g  
   pSysMenu->AppendMenu(MF_SEPARATOR); #lP8/-s^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;X,u   
  } k5.5$<< T  
 } x [FLV8`b|  
 SetIcon(m_hIcon, TRUE); // Set big icon -Qn7+?P  
 SetIcon(m_hIcon, FALSE); // Set small icon P#~B @d  
 m_Key.SetCurSel(0); Pj-INc96  
 RegisterHotkey(); yS\&2"o  
 CMenu* pMenu=GetSystemMenu(FALSE); 7R2O[=Szq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m,E$KHt (  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); EbQLMLD%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); '3(^Zv  
 return TRUE; // return TRUE unless you set the focus to a control Fr8GGN~/  
} 5XZ! yYB?  
e /JQ #A  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) WVy'f|3;  
{ { :tO RF  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) d qn5G!fI  
 { ~ y!'\d>q<  
  CAboutDlg dlgAbout; neDXzMxF  
  dlgAbout.DoModal(); kW g.-$pp  
 } c0@8KW[,  
 else yJm"vN  
 { 85GIEUvH/  
  CDialog::OnSysCommand(nID, lParam); /9w>:i81  
 } }9'`3vsJ  
} n~*".ZC'Y  
NXY jb(4:  
void CCaptureDlg::OnPaint() 3yZmW$E.  
{ G21o @38e  
 if (IsIconic()) 5~JT*Ny  
 { ^"/^)Lb!@M  
  CPaintDC dc(this); // device context for painting Cl}nP UoL  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Zh<;r;2  
  // Center icon in client rectangle *glZb;_  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4]y)YNQ(  
  int cyIcon = GetSystemMetrics(SM_CYICON); |@Tga_0p  
  CRect rect; DmiBM6t3N  
  GetClientRect(&rect); 86r5!@WN  
  int x = (rect.Width() - cxIcon + 1) / 2; >1~ /:DJ  
  int y = (rect.Height() - cyIcon + 1) / 2; $1an#~  
  // Draw the icon IY`p7 )#i  
  dc.DrawIcon(x, y, m_hIcon); 1sQIfX#2f  
 } nVb@sI{{k  
 else 9)q3cjP{<  
 {  }vd*eexA  
  CDialog::OnPaint(); &_ekA44E  
 } QU|_ r2LM  
} WlMcEje  
OU[<\d  
HCURSOR CCaptureDlg::OnQueryDragIcon() E $@W~).!  
{ {*ak>Wud  
 return (HCURSOR) m_hIcon; (\9`$   
} #< im?  
>Jz9wo`  
void CCaptureDlg::OnCancel() k9^Hmhjw  
{ qLN^9PdEE  
 if(bTray) c3A\~tHW  
  DeleteIcon(); '$K E= Jy  
  CDialog::OnCancel(); G6sK3K  
} kmI0V[Y  
>ZgzE  
void CCaptureDlg::OnAbout() }h5i Tc  
{ -4a9BE".  
 CAboutDlg dlg; xt{'Be&Ya+  
 dlg.DoModal(); Ccf/hA#mb  
} (q> TKM  
)ZJvx%@i  
void CCaptureDlg::OnBrowse() /Rp]"S vt  
{ Lsmcj{1d  
 CString str; p*Bty@CRi  
 BROWSEINFO bi; }'X=&3m  
 char name[MAX_PATH]; o`?rj!\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {f!/:bM  
 bi.hwndOwner=GetSafeHwnd(); &1xCPKIr  
 bi.pszDisplayName=name; }I"C4'(a  
 bi.lpszTitle="Select folder"; (C2 XFg_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; OZ,kz2SF#  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); lq/2Y4LE)  
 if(idl==NULL) W? iA P  
  return; s[1ao"sZ^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3dShznlf_*  
 str.ReleaseBuffer(); }{aGh I~<  
 m_Path=str; R$awgSE  
 if(str.GetAt(str.GetLength()-1)!='\\') S2~cAhR|M  
  m_Path+="\\"; "n-'?W!  
 UpdateData(FALSE); 8sG3<$Z^  
} 30Q p^)K  
<#63tN9  
void CCaptureDlg::SaveBmp() fCl}eXg6w  
{ !QUY (  
 CDC dc; yqK4 "F&  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &J[a.:..  
 CBitmap bm; X'9.fKp  
 int Width=GetSystemMetrics(SM_CXSCREEN); )Nv1_en<!  
 int Height=GetSystemMetrics(SM_CYSCREEN); bQAznd0  
 bm.CreateCompatibleBitmap(&dc,Width,Height); i%glQT  
 CDC tdc; /'O8RUjN  
 tdc.CreateCompatibleDC(&dc); p|4qkJK8  
 CBitmap*pOld=tdc.SelectObject(&bm); Gn]36~)*H  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bdUPo+  
 tdc.SelectObject(pOld); D7ex{SVA)  
 BITMAP btm; [}X|&`'i  
 bm.GetBitmap(&btm); ?HZp @ &  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; G4&s_ M$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]6&NIz`:,  
 BITMAPINFOHEADER bih; $ |4C]Me (  
 bih.biBitCount=btm.bmBitsPixel; l{3B }_,  
 bih.biClrImportant=0; jjpYg  
 bih.biClrUsed=0; @u3`lhUcT  
 bih.biCompression=0; e5h*GKF  
 bih.biHeight=btm.bmHeight; ]`E+HLEQ'  
 bih.biPlanes=1; \ /-c)  
 bih.biSize=sizeof(BITMAPINFOHEADER); rCyb3,W  
 bih.biSizeImage=size; )n/%P4l  
 bih.biWidth=btm.bmWidth; FB=oGgwwq  
 bih.biXPelsPerMeter=0; #u<Qc T@  
 bih.biYPelsPerMeter=0; L\yVE J9x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )fH Q7  
 static int filecount=0; X@nBj;   
 CString name; fSh5u/F!  
 name.Format("pict%04d.bmp",filecount++); ]wQ!ZG?)  
 name=m_Path+name; #XV=,81w  
 BITMAPFILEHEADER bfh; ,CO2d)}  
 bfh.bfReserved1=bfh.bfReserved2=0; XGlt^<`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); W<Uu.Y{sG  
 bfh.bfSize=54+size; -H1=N  
 bfh.bfOffBits=54; ^}3^|jF  
 CFile bf; vN v?trw  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ] !UYl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e4X df>B  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ]5W$EvZ9)  
  bf.WriteHuge(lpData,size); KuNLu31%  
  bf.Close(); iP/v "g"g  
  nCount++; 61\u{@o$  
 } <sdgL+&1h  
 GlobalFreePtr(lpData); D+8d^-:  
 if(nCount==1) ^<]'?4m]  
  m_Number.Format("%d picture captured.",nCount); aCQtE,.  
 else c=\tf~}^Ms  
  m_Number.Format("%d pictures captured.",nCount); T.q2tC[bR  
  UpdateData(FALSE); [ X*p [  
} eK8H5YE  
V>$( N/1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ! VwU=5  
{ t2&kGf"  
 if(pMsg -> message == WM_KEYDOWN) +^I0> \  
 { dzcF1 5H1  
  if(pMsg -> wParam == VK_ESCAPE) U}v`~' K  
   return TRUE; B6XO&I1c  
  if(pMsg -> wParam == VK_RETURN) |@ mz@  
   return TRUE; ?7{U=1gb$  
 } uL'f8Pqg  
 return CDialog::PreTranslateMessage(pMsg); {N(qS'N  
} AZ:7_4jz  
A`c22Ls]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;w{<1NH2+.  
{ #86N !&x  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ FOaA}D `]  
  SaveBmp(); P \7DA4]  
  return FALSE; O5dS$[`j\p  
} :]"5UY?oF  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jzvK;*N  
 CMenu pop; $Dg-;I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Rq4; {a/j  
 CMenu*pMenu=pop.GetSubMenu(0); x"r0<RK  
 pMenu->SetDefaultItem(ID_EXITICON); l,ny=Q$[1'  
 CPoint pt; Q G) s  
 GetCursorPos(&pt); 37bMe@W  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); pDQ f(@M[  
 if(id==ID_EXITICON) IrwQ~z3I  
  DeleteIcon(); u09Tlqh0 3  
 else if(id==ID_EXIT) I#l}5e5  
  OnCancel(); ktu?-?#0,  
 return FALSE; QE<Z@/V*a  
} !_glZ*tL  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); sA0 Ho6  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) G T>'|~e  
 AddIcon(); g`EZLDjt  
 return res; w,~*ead  
} 0 9H rn  
o'Bd. B  
void CCaptureDlg::AddIcon() +cpb!YEAb  
{ U#<d",I  
 NOTIFYICONDATA data; ]l7W5$26 @  
 data.cbSize=sizeof(NOTIFYICONDATA); DR"Y(-xl  
 CString tip; S)CsH1Q  
 tip.LoadString(IDS_ICONTIP); wl=tN{R  
 data.hIcon=GetIcon(0); ulR yt^bx|  
 data.hWnd=GetSafeHwnd(); ITPE2x  
 strcpy(data.szTip,tip); *i#2>=)  
 data.uCallbackMessage=IDM_SHELL; vE]ge  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8)B{x[?|  
 data.uID=98;  D2e-b  
 Shell_NotifyIcon(NIM_ADD,&data); cIug~ x>  
 ShowWindow(SW_HIDE); I=`?4%  
 bTray=TRUE; B<W}:>3  
} "2e3 <:$  
a%go[_w  
void CCaptureDlg::DeleteIcon() N$=YL @m8  
{ 3 9 8)\3o  
 NOTIFYICONDATA data; /Qgb t  
 data.cbSize=sizeof(NOTIFYICONDATA); L3]J8oEmU  
 data.hWnd=GetSafeHwnd(); 'r'=%u$1C  
 data.uID=98; ]dycesc'  
 Shell_NotifyIcon(NIM_DELETE,&data); y"?`MzcJ0  
 ShowWindow(SW_SHOW); "|\hTRQ  
 SetForegroundWindow(); 3Vu}D(PJ  
 ShowWindow(SW_SHOWNORMAL); jAQ{H  
 bTray=FALSE; a%q,P @8  
} k-$Acv(  
b[vE!lJEq  
void CCaptureDlg::OnChange() )L<.;`g4x  
{ q NGR6i  
 RegisterHotkey(); F6{g{ B  
} 1N/4W6  
& -/J~b)"  
BOOL CCaptureDlg::RegisterHotkey() )Rr6@o  
{ E2hsSqsu=  
 UpdateData(); ^Ks1[xc*`  
 UCHAR mask=0; mQj#\<*  
 UCHAR key=0; 288mP]a(v_  
 if(m_bControl) aru2H6  
  mask|=4; }$?FR  
 if(m_bAlt) j;$f[@0o  
  mask|=2; ueg%yvO  
 if(m_bShift) g}9 ,U&$]y  
  mask|=1; @= <{_p  
  key=Key_Table[m_Key.GetCurSel()]; @Y~gdK  
 if(bRegistered){ }3 /io0"D  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \mF-L,yu  
  bRegistered=FALSE; k_g@4x1y*  
 } Q}#4Qz~n  
 cMask=mask; 8%4;'[UV  
 cKey=key; G>~/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); S iNgV\('U  
 return bRegistered; m?-)SA  
} '{`KYKLP+  
cGE{dWz  
  四、小结 % :G78.  
f:j:L79}  
  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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