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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: ;u-< {2P  
  q@RY.&mgW  
  一、实现方法 _I70qz8  
KxTYc  
  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: ;~1/eF  
@Ozf}}#  
#pragma data_seg("shareddata") yV]-Oa$*s0  
HHOOK hHook =NULL; //钩子句柄 zC>(!fJqq  
UINT nHookCount =0; //挂接的程序数目 S,<.!v57  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 nu<!2xs,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 }HQT@&=  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Q]?J%P.  
static int KeyCount =0; U-]PWt?C{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %},S#5L3  
#pragma data_seg() PK`(qK9  
Xde=}9  
  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。 r;6YCI=z  
MIyLQ  
  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: iN9!?Ov_  
_~#C $-T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR X9`C2fyVd  
cKey,UCHAR cMask) :;#}9g9  
{ w-Q 6 -  
 BOOL bAdded=FALSE; FLnAN;  
 for(int index=0;index<MAX_KEY;index++){ wM&x8 <  
  if(hCallWnd[index]==0){ fvBC9^3  
   hCallWnd[index]=hWnd; zl8\jP  
   HotKey[index]=cKey; I(kIHjV|  
   HotKeyMask[index]=cMask; ) ImIPSL  
   bAdded=TRUE; q2U"k  
   KeyCount++; R^O)fL0_  
   break; LAVt/TcZS|  
  } ;eEtdoy  
 } N4]6LA6x6  
 return bAdded; [N$_@[  
} [6gHi.`p'  
//删除热键 %Ja{IWz9L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) E,?aBRxy  
{ ZxeE6&#M^w  
 BOOL bRemoved=FALSE; y2% ^teX k  
 for(int index=0;index<MAX_KEY;index++){  F-\8f(\  
  if(hCallWnd[index]==hWnd){ tlxjs]{0E  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ kd4*Zab  
    hCallWnd[index]=NULL; +n~rM'^4/  
    HotKey[index]=0; 9M~$W-5  
    HotKeyMask[index]=0; \,#4+&4b  
    bRemoved=TRUE; 7Hlh (k  
    KeyCount--; >5},qs:lZ  
    break; *M!YQ<7G^d  
   } |/Q."d  
  } 3LnyQ  
 } 9l^  
 return bRemoved; M,U=zNPnk  
} L$?~TY  
F4{. 7BT  
7ofH@U  
  DLL中的钩子函数如下: \^W?   
(']z\4o  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) exN#!& ;  
{ oW1olmpp=  
 BOOL bProcessed=FALSE; D~?*Xv]s ~  
 if(HC_ACTION==nCode) n[S*gX0  
 { 7XC}C+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 pQ`L=#WM  
   switch(wParam) >;U%~yy}qc  
   {  q9z!g/,d/  
    case VK_MENU: zyn =Xv@p  
     MaskBits&=~ALTBIT; B-p5;h>  
     break; K>JU/(  
    case VK_CONTROL: kT=|tQ@  
     MaskBits&=~CTRLBIT; ' g!_Flk  
     break; NP`ll0s  
    case VK_SHIFT: ?B:wV?-`  
     MaskBits&=~SHIFTBIT; eOO*gM=  
     break; MP&4}De  
    default: //judge the key and send message U~@B%Msb L  
     break; Fm~}A4  
   } mNB ]e5 ;N  
   for(int index=0;index<MAX_KEY;index++){ %z_b/yG  
    if(hCallWnd[index]==NULL) 5*'N Q010  
     continue; bN %MT#X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ) G&3V  
    { UdgI<a~`k6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Uy'ZL(2  
     bProcessed=TRUE; " yl"A4p S  
    } `X03Q[:q"[  
   } uXa}<=O  
  } R,Uy3N  
  else if((lParam&0xc000ffff)==1){ //有键按下 @!HMd{r  
   switch(wParam) w|*G`~l09  
   { ! r\ktX  
    case VK_MENU: wm[d5A4  
     MaskBits|=ALTBIT; \Le #+ P  
     break; zq>"a&Y,  
    case VK_CONTROL: (MU7  
     MaskBits|=CTRLBIT; ?bi^h/ f  
     break; D4S?b ZFHo  
    case VK_SHIFT: 6>7LFV1tvy  
     MaskBits|=SHIFTBIT; HpSf I7  
     break; lFt{:HfX-  
    default: //judge the key and send message 5]ob;tAm  
     break; e%7P$.  
   } aV#;o9H{  
   for(int index=0;index<MAX_KEY;index++){ 9cPucKuj  
    if(hCallWnd[index]==NULL) "Z?":|%7  
     continue; pl/$@K?L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g+F_M  
    { Lh$ac-Ct  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); &,|uTIs  
     bProcessed=TRUE; O3GaxM \x  
    } td$Jx}'A  
   } #Ih(2T i  
  } }eK*)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \zDV|n~{w  
   for(int index=0;index<MAX_KEY;index++){ ZI]K+jza  
    if(hCallWnd[index]==NULL) pMrf i}esx  
     continue; ~u1J R`y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $\H46Ji  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I#e*,#'S  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QNBzc {XB  
   } %?wE/LU>  
  } EU~'n-  
 } @&> +`kgU-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Ki\jiflc7  
} ( ~o+pp!  
'm ((G4  
  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: \wd`6  
GY :IORuA4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ghe=hhZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JYU Ks~Qt  
*xKR;?.  
  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: 2M`Ni&v  
^ZBkt7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) m>:ig\  
{ nJw1Sl5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) l,8| E  
 { ^jC0S[csw2  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (P_+m#  
  SaveBmp(); }RK9Onh3G  
  return FALSE; RH'R6  
 } J#nEGl|a  
 …… //其它处理及默认处理 $o^}<)DW  
} B-zt(HG  
L1+cv;t  
p gi7 JQ  
  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。 pYQs|5d  
IC42O_^  
  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。 69L&H!<i:  
]kvE+m&p}^  
  二、编程步骤 '93&?  
c" HCc]  
  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"; fTcRqov  
@UBp;pb}=h  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]sE^=;Pv?  
g9.hR8X  
  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; M?97F!\U  
8i"fhN3?Y  
  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; Rh^$0Q*2  
2|EoP-K7  
  5、 添加代码,编译运行程序。 5lbh "m=  
fA5# 2P{  
三、程序代码 %vzpp\t  
jws(`mIf\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1uE[ %M  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }zi6F.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ~yg9ZM  
#if _MSC_VER > 1000  _^ZII  
#pragma once {:cA'6f.b  
#endif // _MSC_VER > 1000 8'62[e|=7[  
#ifndef __AFXWIN_H__ 6<R U~Gh  
#error include 'stdafx.h' before including this file for PCH &kt#p;/p?  
#endif VI{1SIhfa  
#include "resource.h" // main symbols +!wc(N[(2  
class CHookApp : public CWinApp xDS9gGr  
{ =X):Zi   
 public: %0'f`P6  
  CHookApp(); oKiu6=  
  // Overrides &aU+6'+QXB  
  // ClassWizard generated virtual function overrides 8iB}a\]B  
  //{{AFX_VIRTUAL(CHookApp) uNDkK o<M  
 public: Z )I4U  
  virtual BOOL InitInstance(); #B[>\D"*  
  virtual int ExitInstance(); a1&^P1.  
  //}}AFX_VIRTUAL lRq!|.C  
  //{{AFX_MSG(CHookApp) 7[PXZT  
  // NOTE - the ClassWizard will add and remove member functions here. rL/+`H  
  // DO NOT EDIT what you see in these blocks of generated code ! 9:WKG'E8a  
  //}}AFX_MSG Ig2VJs;  
  DECLARE_MESSAGE_MAP() [;bLlS,  
}; |ipppE=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _4w%U[GT,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'tj4;+xf^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IG\\RYr  
BOOL InitHotkey(); / e,lD)  
BOOL UnInit(); Hqk2W*UTl  
#endif )sr]}S0  
 Qy%/+9L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :A[/;|&  
#include "stdafx.h" 'S\H% -  
#include "hook.h" 9v A`\\9  
#include <windowsx.h> 4+0Zj+ q";  
#ifdef _DEBUG 62q-7nV  
#define new DEBUG_NEW Y;WrfO$J  
#undef THIS_FILE -K{ID$!p  
static char THIS_FILE[] = __FILE__; !~#31kL&  
#endif q]aRJ`9f  
#define MAX_KEY 100 [S%  
#define CTRLBIT 0x04 t+VPX2  
#define ALTBIT 0x02 _e W*  
#define SHIFTBIT 0x01 <f%9w]  
#pragma data_seg("shareddata") zq#o8))4X  
HHOOK hHook =NULL; 8~bPoWP  
UINT nHookCount =0; 3ml|`S  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $n) w4p_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }% =P(%-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ) )Nc|`  
static int KeyCount =0; 0#ph1a<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift >_".  
#pragma data_seg() 5VN4A<))  
HINSTANCE hins; ??Lxb% 7R  
void VerifyWindow(); dK-G%5)r  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) FWj~bn  
//{{AFX_MSG_MAP(CHookApp) !}%giF$-  
// NOTE - the ClassWizard will add and remove mapping macros here. [ kknY+n1  
// DO NOT EDIT what you see in these blocks of generated code! Ptg73Gm&R  
//}}AFX_MSG_MAP 'nul{RE*  
END_MESSAGE_MAP() UkC\[$-"\  
cjL!$OE6  
CHookApp::CHookApp() ;%)i/MGEB  
{ XpGom;z^c  
 // TODO: add construction code here, [O3R(`<e5  
 // Place all significant initialization in InitInstance BBDOjhik  
} hf '3yEm  
2+'&||h  
CHookApp theApp; z"-Urd^O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <5.{+!BM  
{ 0-FbV,:;  
 BOOL bProcessed=FALSE; +RM3EvglDQ  
 if(HC_ACTION==nCode) cGD A0#r  
 { (8{Z@  
  if((lParam&0xc0000000)==0xc0000000){// Key up (]JJ?aAF  
   switch(wParam) %+.]>''a  
   { S'WmPv  
    case VK_MENU: _MR2,mC  
     MaskBits&=~ALTBIT; F-nt7l  
     break; _^B+Xo@E-  
    case VK_CONTROL:  _R ]1J0  
     MaskBits&=~CTRLBIT; FR&RIFy  
     break; REw3>/=  
    case VK_SHIFT: >TE&myZ?*  
     MaskBits&=~SHIFTBIT; biJU r^n  
     break; %ug`dZ/  
    default: //judge the key and send message 5H79) n>  
     break; OygYP  
   } ?E`J-ncP  
   for(int index=0;index<MAX_KEY;index++){ _tjH=Ff$  
    if(hCallWnd[index]==NULL) %w@(V([(c  
     continue; 1 >Op)T>{c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =\3*;59\  
    { (z[cf|he  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :KFhryN  
     bProcessed=TRUE; 4]cOTXk9C  
    } 3K'3Xp@A  
   } q/[)mr|~  
  } b~|B(lL6Xm  
  else if((lParam&0xc000ffff)==1){ //Key down E?;W@MJi  
   switch(wParam) m'S-h'a  
   { BH}u\K  
    case VK_MENU: N\p3*#M  
     MaskBits|=ALTBIT; Z d%*,\`S  
     break; NzEuiI}  
    case VK_CONTROL: }b-?Dm_H  
     MaskBits|=CTRLBIT; :{sX8U%  
     break; Mfgd;FsX#  
    case VK_SHIFT: 7S Qu  
     MaskBits|=SHIFTBIT; /A>/]2(  
     break; Lpn`HAw&  
    default: //judge the key and send message p%?R;W`u2  
     break; m$4Gm(Up  
   } FnCHbPlb  
   for(int index=0;index<MAX_KEY;index++) `a J[ !O  
   { 2@ad! h  
    if(hCallWnd[index]==NULL) 4-TM3Cw`d&  
     continue; {{O1C ~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =IUTU4!]  
    { 6PTD%Rf\  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G~_dSa@g G  
     bProcessed=TRUE; u^`B#b '  
    } # OJD<=")  
   } \dP2xou=  
  } rsP1?Hxq  
  if(!bProcessed){ zRz3ot,|  
   for(int index=0;index<MAX_KEY;index++){ ci$o~b6V  
    if(hCallWnd[index]==NULL) q H+~rj  
     continue; xD~:= ]G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) EZ$m4: {e  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k`N)-`O7  
   } ON$u581 y  
  } >FY`xl\m}<  
 } 6l50IWj,T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); rc$G0O  
} [1E u6X6  
nJ6bC^*)U  
BOOL InitHotkey() ub-ZrC'  
{ <AB]FBo(  
 if(hHook!=NULL){ {6n B83BB  
  nHookCount++; 5VISP4a  
  return TRUE; GI/g@RV  
 } ~O<Bs{8  
 else /{Nx%PqL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); J3K!@m_\  
  if(hHook!=NULL) x1TB (^aX  
   nHookCount++; 2cww7z/B  
  return (hHook!=NULL); nzU@}/A/  
} ATwPfo8jx@  
BOOL UnInit() KF-n_:Bd+  
{ E")82I  
 if(nHookCount>1){ GU_R6Wt+  
  nHookCount--; -{ZRk[>Z  
  return TRUE; HQ]g{JVld\  
 } %POoyH@D}  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t,&1~_9  
 if(unhooked==TRUE){ x ;kW }U  
  nHookCount=0; O7E0{8  
  hHook=NULL; { c]y<q  
 } H1N%uk=kV  
 return unhooked; rR/PnVup  
} >R :Bkf-  
O[$ &]>x]]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8E|S`I  
{ `|I h"EZ  
 BOOL bAdded=FALSE; Lg-Sxz}P!  
 for(int index=0;index<MAX_KEY;index++){ ]81P<Y(7  
  if(hCallWnd[index]==0){ O{Wy;7i  
   hCallWnd[index]=hWnd; kvKbl;<&#  
   HotKey[index]=cKey; z`'{l {  
   HotKeyMask[index]=cMask; @'dtlY5;  
   bAdded=TRUE; u3kZOsG  
   KeyCount++; hv8V=Z'Q  
   break; - wCfwC  
  } 8n NRn[oS  
 } W* N^Gp@  
 return bAdded; =`u4xa#m  
} 06L/i,  
/JJU-A(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (oxe'\  
{ =lA*?'kd  
 BOOL bRemoved=FALSE; 5ILce%#zL  
 for(int index=0;index<MAX_KEY;index++){ `Fnt#F}  
  if(hCallWnd[index]==hWnd){ ~Sh8. ++}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xji<oih  
    hCallWnd[index]=NULL; r6JdF!\d  
    HotKey[index]=0; Q/L:0ovR  
    HotKeyMask[index]=0; :IvKxOv  
    bRemoved=TRUE;  qauk,t  
    KeyCount--; u 6;SgPw  
    break; 3 l QGU  
   } $fL2w^ @  
  } g"^<LX-  
 } &E0P`F,GQA  
 return bRemoved; yKgA"NaM  
} |cUTP!iy  
N"@aisi)  
void VerifyWindow() yMB*/vs  
{ xXQDHc -Ba  
 for(int i=0;i<MAX_KEY;i++){ )BmK'H+l  
  if(hCallWnd!=NULL){ +<7`Gn(n3  
   if(!IsWindow(hCallWnd)){ -ich N/U]s  
    hCallWnd=NULL; gWL'Fl}H  
    HotKey=0; ]+Ik/+Nz  
    HotKeyMask=0; N8_ c%6GE  
    KeyCount--; rK7m(  
   } 6O>NDTd%  
  } 4At{(fw W  
 } \%g# __\  
} XcD$xFDZ  
$GB/}$fd&  
BOOL CHookApp::InitInstance() AT+7!UGL  
{ 3]$qY_|7  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); n j0!  
 hins=AfxGetInstanceHandle(); D% v{[ KY  
 InitHotkey(); T5$db-^  
 return CWinApp::InitInstance(); ^Q0%_V,  
} 2Sz?r d,0f  
Bs:INvhYW  
int CHookApp::ExitInstance() q &]I  
{ t4X:I&l-M:  
 VerifyWindow(); 8 6y)+h`  
 UnInit(); eEl}.W}  
 return CWinApp::ExitInstance(); AU0pJB'  
} _[SW89zk  
W"MwpV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {$5?[KD  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^~XsHmcQ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ cdY|z]B  
#if _MSC_VER > 1000 > PHin%#  
#pragma once FX}kH]  
#endif // _MSC_VER > 1000 =Kqb V{!  
<#HQU<  
class CCaptureDlg : public CDialog rY yB"|  
{ Vz[tgb]-  
 // Construction ,}?x!3  
 public: c%tb6@C  
  BOOL bTray; R+}7]tva6C  
  BOOL bRegistered; aGSix}b1P  
  BOOL RegisterHotkey(); 8=\}#F  
  UCHAR cKey; dX^ ^ @7  
  UCHAR cMask; ~?E.U,R  
  void DeleteIcon(); Q#M@!&  
  void AddIcon(); Pr|BhX  
  UINT nCount; $z[FL=h)?+  
  void SaveBmp(); p$.m=+K~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _/xA5/V  
  // Dialog Data awu18(;J  
  //{{AFX_DATA(CCaptureDlg) 2nz^%pLT  
  enum { IDD = IDD_CAPTURE_DIALOG }; IqD;*  
  CComboBox m_Key; ePLpGT  
  BOOL m_bControl; iX (<ozH  
  BOOL m_bAlt; KUD&vqx3  
  BOOL m_bShift; C ^QpVt-T  
  CString m_Path; jTHgh>n  
  CString m_Number; wX/0.aZ|  
  //}}AFX_DATA z'"e|)  
  // ClassWizard generated virtual function overrides (+aU,EQ  
  //{{AFX_VIRTUAL(CCaptureDlg) P]cC2L@Vbi  
 public: bSJ@ 5qS  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ,#?iu?i/  
 protected: [0>I6Jl  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Tew?e&eO  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -}:; EGUtd  
  //}}AFX_VIRTUAL V)<Jj  
  // Implementation p#;I4d G  
 protected: :}0>IPW-V  
  HICON m_hIcon; UmEc")3  
  // Generated message map functions b;xn0sDn#  
  //{{AFX_MSG(CCaptureDlg) j3=%J5<  
  virtual BOOL OnInitDialog(); dBRK6hFC  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); )wqG^yv  
  afx_msg void OnPaint(); ^L4"X~eM  
  afx_msg HCURSOR OnQueryDragIcon(); Rq`d I~5!b  
  virtual void OnCancel(); t nvCtuaR  
  afx_msg void OnAbout(); e)BU6m%  
  afx_msg void OnBrowse(); ~S\y)l\wZ  
  afx_msg void OnChange(); CqFk(Td9-D  
 //}}AFX_MSG ^]n:/kZ5"[  
 DECLARE_MESSAGE_MAP() H"5=z7w  
}; \Dlmrke  
#endif ,uo K'_  
-_[ZRf?^  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ;]vJ[mi~  
#include "stdafx.h" 9u0<$UY%  
#include "Capture.h" Ie"eqO!  
#include "CaptureDlg.h" , ;$SRQ.  
#include <windowsx.h> y <] x  
#pragma comment(lib,"hook.lib") qe[P'\]L  
#ifdef _DEBUG e|1.-P@  
#define new DEBUG_NEW Ah :d2*SR4  
#undef THIS_FILE [ikW3 '99,  
static char THIS_FILE[] = __FILE__; yt+d f0l  
#endif [x[ nTIg  
#define IDM_SHELL WM_USER+1 u; G-46  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z{m%^,Cs,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K3dg.>O  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hEhvA6f,  
class CAboutDlg : public CDialog <rI8O;\H  
{ C.`!?CW  
 public: *N65B#  
  CAboutDlg(); \p.eY)>  
  // Dialog Data Gr&YzbSX  
  //{{AFX_DATA(CAboutDlg) bDtb"V8e  
  enum { IDD = IDD_ABOUTBOX }; %LjhK,'h  
  //}}AFX_DATA \%/Y(YVm  
  // ClassWizard generated virtual function overrides &"6%D|Z0  
  //{{AFX_VIRTUAL(CAboutDlg) +bdjZD3  
 protected: L S%;ZKJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $97EeE:{M  
  //}}AFX_VIRTUAL q=x1:^rVH  
  // Implementation D}T+X ;u)K  
 protected: It#T\fU  
  //{{AFX_MSG(CAboutDlg) 3]rd!Gp=*  
  //}}AFX_MSG 9.>he+  
  DECLARE_MESSAGE_MAP() 4Ai#$SHLm  
}; Lj2Au_5  
~5:-;ZbZ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bIy:~z5   
{ _z6" C8W  
 //{{AFX_DATA_INIT(CAboutDlg) *f-8egt-  
 //}}AFX_DATA_INIT ,V &RpKek  
} \Z8:^ct.P  
_Gtq]`y  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) UF PSQ  
{ Z/oP?2/Afh  
 CDialog::DoDataExchange(pDX); WH lvd  
 //{{AFX_DATA_MAP(CAboutDlg) AGMrBd|J{  
 //}}AFX_DATA_MAP jM[]Uh  
} uRnSwJ"hE  
?#gYu %7DN  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >A.m`w  
 //{{AFX_MSG_MAP(CAboutDlg) (5h+b_eB  
 // No message handlers l*-$H$  
 //}}AFX_MSG_MAP Jty/gjK+  
END_MESSAGE_MAP() ^kh@AgG^  
,M0#?j>  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) x.%x|6G*  
: CDialog(CCaptureDlg::IDD, pParent) +Z/aB*aVa^  
{ iM_Zn!|@\  
 //{{AFX_DATA_INIT(CCaptureDlg) QHPC?a6CD  
  m_bControl = FALSE; wS;hC&~2  
  m_bAlt = FALSE; Bhf4 /$  
  m_bShift = FALSE; ^GC 8^f  
  m_Path = _T("c:\\"); ' }T6dS  
  m_Number = _T("0 picture captured."); wvz_)b N~A  
  nCount=0; cr>"LAi  
  bRegistered=FALSE; R4 AKp1Y  
  bTray=FALSE; Sp\ 7  
 //}}AFX_DATA_INIT {GhM,-%e  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !b{7gUjyI  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &BE'~G  
} IRK(y*6  
}0 b[/ZwQ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ;oivG)hJl  
{ `3'4_@7s9  
 CDialog::DoDataExchange(pDX); E-i <^&E  
 //{{AFX_DATA_MAP(CCaptureDlg) LWIPq"  
  DDX_Control(pDX, IDC_KEY, m_Key); `kM:5f+>W  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); RGz NZc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); q-D|96>8  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); vN$j @h .  
  DDX_Text(pDX, IDC_PATH, m_Path); ;S}_/'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); g1(`a`M  
 //}}AFX_DATA_MAP ~T:L0||.%9  
} fBZR  
A5kz(pj  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'D[g{LkL  
//{{AFX_MSG_MAP(CCaptureDlg) k*k 9hv?  
 ON_WM_SYSCOMMAND() |YWX.-aeo  
 ON_WM_PAINT() [fIElH<  
 ON_WM_QUERYDRAGICON() %dDwus  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?X~U[dV?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &? z6f9*$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) p^X \~Yibs  
//}}AFX_MSG_MAP ES9|eo6  
END_MESSAGE_MAP() &vV_,$  
"2>_eZ#b  
BOOL CCaptureDlg::OnInitDialog() C,G$C7$%  
{ -Ou@T#h"  
 CDialog::OnInitDialog(); 7#9yAS+x(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); uS&NRf9A  
 ASSERT(IDM_ABOUTBOX < 0xF000); hM~zO1XW  
 CMenu* pSysMenu = GetSystemMenu(FALSE); gQlL0jAV  
 if (pSysMenu != NULL) yGX"1Fb?;x  
 { rF)[ Sed:T  
  CString strAboutMenu; ]x^v;r~  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +@jX|  
  if (!strAboutMenu.IsEmpty()) E;Q ,{{#  
  { /8"9 sf *  
   pSysMenu->AppendMenu(MF_SEPARATOR); {/K_NSg+h  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5/C#*%EH'  
  } xZ(f_Oy  
 } 6R';[um?q  
 SetIcon(m_hIcon, TRUE); // Set big icon IHStN,QD  
 SetIcon(m_hIcon, FALSE); // Set small icon !)+8:8H'  
 m_Key.SetCurSel(0); zqs|~W]c  
 RegisterHotkey(); 1jkMje  
 CMenu* pMenu=GetSystemMenu(FALSE); vY'E+M"+@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); V7q-Pfh!y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); :vRUb>z  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); =x^b  
 return TRUE; // return TRUE unless you set the focus to a control U]W+ers  
} <imIgt|`2  
FCPi U3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tZqy \_G  
{ %\QK/`krp  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) LS{t7P9K  
 { 3PgiV%]  
  CAboutDlg dlgAbout; L0dj 76'M  
  dlgAbout.DoModal(); oY8S-N;(t  
 } '/ v@q]!  
 else kSq1Q#Bxq  
 { \'.#of  
  CDialog::OnSysCommand(nID, lParam); TaTs-]4  
 } 5*IfI+}  
} ,+hH|$  
RT$.r5l_@  
void CCaptureDlg::OnPaint() uIb,n5  
{ 64w4i)?eM[  
 if (IsIconic()) & U6bOH%P  
 { )MlT=k6S  
  CPaintDC dc(this); // device context for painting xIb^x=|h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); zf}X%tp  
  // Center icon in client rectangle >YuiCf?c7  
  int cxIcon = GetSystemMetrics(SM_CXICON); bL"!z"NA  
  int cyIcon = GetSystemMetrics(SM_CYICON); Kb5 YA  
  CRect rect; M^3pJ=;5  
  GetClientRect(&rect); qt{{q  
  int x = (rect.Width() - cxIcon + 1) / 2; "JJEF2e@Z  
  int y = (rect.Height() - cyIcon + 1) / 2; @EV*QC2l;Y  
  // Draw the icon e SlZAdK  
  dc.DrawIcon(x, y, m_hIcon); S=.7$PY  
 } *eb2()B%  
 else ;Uv/#"r  
 { yo@S.7[/  
  CDialog::OnPaint(); U-0A}@N  
 } ^;=L|{Xl  
} Ln C5"  
%?WR 9}KU0  
HCURSOR CCaptureDlg::OnQueryDragIcon() Hd9vS"TN]  
{ [9>h! khs  
 return (HCURSOR) m_hIcon; Od5I:p]N  
} 4A@77#:J5  
/yn%0Wish  
void CCaptureDlg::OnCancel() xhmrep6+<  
{ _)6N&u8  
 if(bTray) { i2QLS  
  DeleteIcon(); !Ey=  
  CDialog::OnCancel(); 32KL~32Y  
} UoSzxL  
c>3AR17+5  
void CCaptureDlg::OnAbout() F#^<t$5t  
{ 1YxG<K]  
 CAboutDlg dlg; {} gr\  
 dlg.DoModal(); t/`~(0F  
} &)y$XsSMW  
4UV<Q*B\F  
void CCaptureDlg::OnBrowse() )%T< Mw2u  
{ M7JQw/,xs  
 CString str; KqNbIw*sR  
 BROWSEINFO bi; ]1k"'XG4,  
 char name[MAX_PATH]; jQIb :\0#  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ?5e]^H}  
 bi.hwndOwner=GetSafeHwnd(); ,9@JBV%_  
 bi.pszDisplayName=name; K,' v{wSr  
 bi.lpszTitle="Select folder"; OqcM3#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; E)}& p\{E  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); n^P~]1i   
 if(idl==NULL) /-v6jiM  
  return; |{en) {:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); FC BsC#  
 str.ReleaseBuffer();  o<Z  
 m_Path=str; G!L(K  
 if(str.GetAt(str.GetLength()-1)!='\\') Tb@r@j:V  
  m_Path+="\\"; IqW4Q1>f  
 UpdateData(FALSE); qVDf98  
} zA g.,dA  
dr~6}S#  
void CCaptureDlg::SaveBmp() 9z0G0QW[  
{ 7u|X . X  
 CDC dc; Z|k>)pv@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); h]{V/  
 CBitmap bm; O"6 (k{`  
 int Width=GetSystemMetrics(SM_CXSCREEN); i3[%]_eP.  
 int Height=GetSystemMetrics(SM_CYSCREEN); lNwqWOWy  
 bm.CreateCompatibleBitmap(&dc,Width,Height); T1YCld  
 CDC tdc; m2|%AD  
 tdc.CreateCompatibleDC(&dc); 6 J B"qd  
 CBitmap*pOld=tdc.SelectObject(&bm); pSC\[%K  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); #FNSE*Y  
 tdc.SelectObject(pOld); o,D7$WzL  
 BITMAP btm; 6";ew:Ih^  
 bm.GetBitmap(&btm); !Yi2g -(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ?Xq"Q^o4#e  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9>I&Z8J$M  
 BITMAPINFOHEADER bih; uihU)]+@t/  
 bih.biBitCount=btm.bmBitsPixel; 7kDqgod^A  
 bih.biClrImportant=0; 1](PuQm7+  
 bih.biClrUsed=0; "AcC\iq  
 bih.biCompression=0; suF<VJ)&s  
 bih.biHeight=btm.bmHeight; ](2\w9i%  
 bih.biPlanes=1; L)qDtXd4  
 bih.biSize=sizeof(BITMAPINFOHEADER); Nm.G,6<J  
 bih.biSizeImage=size; yPXa  
 bih.biWidth=btm.bmWidth; c`E0sgp  
 bih.biXPelsPerMeter=0; YQ7\99tj  
 bih.biYPelsPerMeter=0; P]mJ01@'  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 99G'`NO  
 static int filecount=0; gL(_!mcwu  
 CString name; LjEG1$F>  
 name.Format("pict%04d.bmp",filecount++); |T)  $E  
 name=m_Path+name; FO S5?%J  
 BITMAPFILEHEADER bfh; =lOdg3#\a  
 bfh.bfReserved1=bfh.bfReserved2=0; qe3d,!  
 bfh.bfType=((WORD)('M'<< 8)|'B'); dWK"Tkf\  
 bfh.bfSize=54+size; e\7AtlW"  
 bfh.bfOffBits=54; y:Ne}S*ncE  
 CFile bf; 2P( 6R.8;6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C4H$w:bVk  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); D<wz%*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); p-o8Ctc?V  
  bf.WriteHuge(lpData,size); V7}]39m(s  
  bf.Close(); =73aME}  
  nCount++; h; "pAE  
 } Hq;*T3E  
 GlobalFreePtr(lpData); UrRYK-g  
 if(nCount==1) h7a/]~  
  m_Number.Format("%d picture captured.",nCount); w =2; QJ<  
 else ~4V-{-=0a7  
  m_Number.Format("%d pictures captured.",nCount); XEe$Wh  
  UpdateData(FALSE); # H)\ts  
} -%)S~ R  
/:.p{y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]]^r)&pox  
{ F6Ne?[b  
 if(pMsg -> message == WM_KEYDOWN) |QHIB?C?`  
 { X@pcL{T!  
  if(pMsg -> wParam == VK_ESCAPE) Q u_=K_W  
   return TRUE; m8Y>4:Nw  
  if(pMsg -> wParam == VK_RETURN) Y~Z&h?H'}  
   return TRUE; m8,jVR  
 } wvcj*{7[  
 return CDialog::PreTranslateMessage(pMsg); TR&7AiqB  
} ' TO/i:{\  
nJ2910"<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) cES8%UC^i  
{ EL^j}P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ B".3NQ  
  SaveBmp(); 9 K~X+N\  
  return FALSE; &ev#C%Nu  
} CsX@u#  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @ QfbIP9  
 CMenu pop; l[Ko>  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); u$rSM0CJ  
 CMenu*pMenu=pop.GetSubMenu(0); +#Ga} e CM  
 pMenu->SetDefaultItem(ID_EXITICON); KSve_CBOh  
 CPoint pt; 6ee1^>  
 GetCursorPos(&pt); 2UeK%-~W?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Xk?Y  
 if(id==ID_EXITICON) XYze*8xUb  
  DeleteIcon(); j*_>/gi  
 else if(id==ID_EXIT) q"-+`;^7(-  
  OnCancel(); RH^; M-'  
 return FALSE; _T(77KLn;  
} b>@fHmpwD  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZfU &X{  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _Rk>yJD7s  
 AddIcon(); vs2xx`Y<Lq  
 return res; ,?c=v`e  
} Zjn![  
(vPE?^}b  
void CCaptureDlg::AddIcon() '-V[t yE  
{ l9+)h }  
 NOTIFYICONDATA data; X&gXhr#dL\  
 data.cbSize=sizeof(NOTIFYICONDATA); p>1Klh:8.'  
 CString tip; xMA2S*%ca  
 tip.LoadString(IDS_ICONTIP); nn8uFISb  
 data.hIcon=GetIcon(0); gg&Dej2{  
 data.hWnd=GetSafeHwnd(); 7e:7RAX  
 strcpy(data.szTip,tip); "Z#MR`;&29  
 data.uCallbackMessage=IDM_SHELL; }_fVv{D   
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4Ix~Feuph  
 data.uID=98; {k)H.zwe  
 Shell_NotifyIcon(NIM_ADD,&data); 50^CILKo7  
 ShowWindow(SW_HIDE); A"wso[{  
 bTray=TRUE; SN5Z@kK  
} *qKf!&  
=zRjb>  
void CCaptureDlg::DeleteIcon() f!bGH-.r5  
{ mMtva}=*  
 NOTIFYICONDATA data; Q(BM0n)f  
 data.cbSize=sizeof(NOTIFYICONDATA); $%z M Z  
 data.hWnd=GetSafeHwnd(); BWLeitS/  
 data.uID=98; 7!A3PDAe  
 Shell_NotifyIcon(NIM_DELETE,&data); Q5c13g2(c  
 ShowWindow(SW_SHOW); X=[`+=  
 SetForegroundWindow(); k8w:8*y'.  
 ShowWindow(SW_SHOWNORMAL); _Kv;hR>  
 bTray=FALSE; IF kU8EK&B  
} ar:qCq$\  
=`t%p1   
void CCaptureDlg::OnChange() \ocC'FmE  
{ lTJM}K  
 RegisterHotkey(); U(\ ^!S1  
} l-q.VY2  
/ jN &VpDG  
BOOL CCaptureDlg::RegisterHotkey() zJTSg  
{ Dw&_6\F@  
 UpdateData(); G\Q0{4w8  
 UCHAR mask=0; Mo&Po9  
 UCHAR key=0; kjRL|qx`a;  
 if(m_bControl) *W<|5<<u@  
  mask|=4; Za'}26  
 if(m_bAlt) $`txU5#vs  
  mask|=2; #4{9l SbU  
 if(m_bShift) +.|8W!h`1  
  mask|=1; lt|UehJ F  
  key=Key_Table[m_Key.GetCurSel()]; rlSflcK\\(  
 if(bRegistered){ |c:xK{Ik  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~c|{PZ9U  
  bRegistered=FALSE; AUwIF/>F(]  
 } fHacVj J  
 cMask=mask; G;;iGN  
 cKey=key; e2Df@8>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); R|K#nh  
 return bRegistered; ''wF%q  
} ;op 8r u  
gro@+^DmT  
  四、小结 ? q hme   
qj<_*  
  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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