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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: zpjqEEY;  
  PXk?aJ  
  一、实现方法 bt/ =Kq#  
<AoXEu D  
  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: `T&jPA9eY  
(k?7:h  
#pragma data_seg("shareddata") v]VWDT `  
HHOOK hHook =NULL; //钩子句柄 6iA( o*'Yn  
UINT nHookCount =0; //挂接的程序数目 Y.6SOu5$]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 kg97S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 O XP\R  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey G }nO@  
static int KeyCount =0; v|';!p|  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WyhhCR=;  
#pragma data_seg() Ea $aUORm  
s Be7"^  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 OF U/gaO~  
8V/L:h#7  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Zu*K-ep"  
2f~($}+*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ~NcQ1.  
cKey,UCHAR cMask) \wvg,j=  
{ .ic:`1  
 BOOL bAdded=FALSE; <n"C,  
 for(int index=0;index<MAX_KEY;index++){ eD?3"!c!  
  if(hCallWnd[index]==0){ Vr.Y/3N&'  
   hCallWnd[index]=hWnd; DGESba\2+  
   HotKey[index]=cKey; 0%`4px4J  
   HotKeyMask[index]=cMask; XzIx:J6  
   bAdded=TRUE; )?! [}t  
   KeyCount++; V9NTs8LKc  
   break; T1WWK'  
  } 5s{j = .O  
 } 8hanzwoJ:  
 return bAdded; ,F6=b/eZ  
} +j14Q$  
//删除热键 iUk-'   
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3>M&D20Z  
{ 6A R2htN^  
 BOOL bRemoved=FALSE; fh8j2S9J  
 for(int index=0;index<MAX_KEY;index++){ &EGqgNl  
  if(hCallWnd[index]==hWnd){ ~ Heb1tl ;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 26?W nu60  
    hCallWnd[index]=NULL; 5Qwh(C^H  
    HotKey[index]=0; ] y{WD=T  
    HotKeyMask[index]=0; x3+oAb@o/  
    bRemoved=TRUE; Cizvw'XDV  
    KeyCount--; YIhm$A"z0"  
    break; 5Z/7kU= I  
   } uP $ Cj  
  } n{0Ld - zH  
 } ZzGahtx)Y  
 return bRemoved; 75T_Dx(H  
} VXBY8;+Yp  
F'}'(t+oAm  
IA zZ1#/3  
  DLL中的钩子函数如下: "^j>tii  
qVqRf.-\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) BAj-akc f  
{ RprKm'b8x`  
 BOOL bProcessed=FALSE; :,12")N  
 if(HC_ACTION==nCode) QS.>0i/7l  
 { u9woEe?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 fc=Patg  
   switch(wParam) u6V/JI}g  
   {  @!N-RQ&A  
    case VK_MENU: [D "t~QMr  
     MaskBits&=~ALTBIT; >Hb^P)3  
     break; 5wao1sd#  
    case VK_CONTROL: n]_[NR) i  
     MaskBits&=~CTRLBIT; -{XRA6  
     break; BcjP+$k4_  
    case VK_SHIFT: {#P `^g  
     MaskBits&=~SHIFTBIT; W W2Ob*  
     break; 0kQPJWF  
    default: //judge the key and send message \6?A!w~6  
     break; AUVgPXOwd  
   } hRI"y":zD  
   for(int index=0;index<MAX_KEY;index++){ G|w=ez  
    if(hCallWnd[index]==NULL) nMfFH[I4  
     continue; }eQRN<}P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) LH 3}d<{  
    { v0Dq@Q1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aJL^AG  
     bProcessed=TRUE; >h2%[j=  
    } unJid8Lo  
   } 87)zCq  
  } jc[_I&Oc_  
  else if((lParam&0xc000ffff)==1){ //有键按下 iqQUtE]E_  
   switch(wParam) xqXDxJlns  
   { /&& 2u7*  
    case VK_MENU: Tu{&v'!j6  
     MaskBits|=ALTBIT; ,:fl?x.X  
     break; \l"&A  
    case VK_CONTROL: 9 3+"D`  
     MaskBits|=CTRLBIT; _zt1 9%Wg  
     break; M/?KV9Xk2  
    case VK_SHIFT: Xtz-\v#0o'  
     MaskBits|=SHIFTBIT; .@-9'<K?~  
     break; l kyzNy9R  
    default: //judge the key and send message Cz4)Yz  
     break; M<SdPC(+  
   } =cN&A_L(  
   for(int index=0;index<MAX_KEY;index++){ #j#_cImE  
    if(hCallWnd[index]==NULL) G$'jEa<:u  
     continue; gj\)CBOv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wiaX&-c]8  
    { j*e6 vX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >{eCh$L  
     bProcessed=TRUE; ZKQ hbNT  
    } ^JI o? R  
   } {7cX#1  
  } mS#zraJn5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )eUW5 tS  
   for(int index=0;index<MAX_KEY;index++){ aK,z}l(N  
    if(hCallWnd[index]==NULL) 6:U$w7P0 e  
     continue; YY?a>j."a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) BR'I+lQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ) xbO6V  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 cJM:  
   } EF pIp4_Y  
  } >FhK #*Pa  
 } J};z85B  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 22kpl)vbU  
} `X,yM-(  
&U+ _ -Ph  
  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: TI9UXa:V\  
k5kdCC0FCk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); c4_`Ew^k  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {_(\` >  
mzQ`N}]T:  
  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: 9Rek4<5  
|Iu npZV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t+,4Ya|Xj  
{ KXV[OF&J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) H Te<x  
 { 5XuT={o  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^Qu iH'  
  SaveBmp(); X7,PEA  
  return FALSE; ,!V]jP)  
 } iK?b~Q  
 …… //其它处理及默认处理 [2ax>Yk$  
} &V|>dLT>A  
9%* wb`&  
jjJ2>3avY  
  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。 y9#$O(G  
{0! ~C=P  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。  tpy>OT$  
:V2bS  
  二、编程步骤 7PR#(ftz  
8Ld:"Y#  
  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"; H _Va"yTO6  
%{6LUn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; IV lf=k  
lTU$0CG  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; SWp1|.=Sm  
_(m't n>   
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; x{NX8lN  
.To;"D;j,  
  5、 添加代码,编译运行程序。 2oJb)CB  
]|_\xO(  
三、程序代码 nW "q  
X7L8h'(@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL [i0Hm)Bd3  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) azjEq$<M  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ .qk]$LJF7  
#if _MSC_VER > 1000 l{w#H|]  
#pragma once iCP/P%  
#endif // _MSC_VER > 1000 1b8p~-LsU  
#ifndef __AFXWIN_H__ Sx    
#error include 'stdafx.h' before including this file for PCH iTW? W\d  
#endif = 07Gy,=i  
#include "resource.h" // main symbols b| SE<\  
class CHookApp : public CWinApp 6 z,&i  
{ ?S?2 0  
 public: y/V%&.$o=  
  CHookApp(); Oi"a:bCU  
  // Overrides ylKmj]A  
  // ClassWizard generated virtual function overrides U|G|l|Bl  
  //{{AFX_VIRTUAL(CHookApp) v){ .Z^_C  
 public: @H!$[m3  
  virtual BOOL InitInstance(); 8Ry74|`=R  
  virtual int ExitInstance(); &h*S y  
  //}}AFX_VIRTUAL OL7_'2_z.  
  //{{AFX_MSG(CHookApp) 7?OH,^  
  // NOTE - the ClassWizard will add and remove member functions here. ,wKe fpV;5  
  // DO NOT EDIT what you see in these blocks of generated code ! */ G<!W  
  //}}AFX_MSG )'l*Tl  
  DECLARE_MESSAGE_MAP() s<x1>Q7X~  
}; ?)'~~ @NkH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Hn,:`mj4-6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); OdMO=Hy6d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); * y^OV_n-8  
BOOL InitHotkey(); PiFD^w  
BOOL UnInit(); hVj NZ  
#endif 5q@LxDy,b  
"QoQ4r<|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P#v*TD'  
#include "stdafx.h" P?BGBbC  
#include "hook.h" X\p,%hk \  
#include <windowsx.h> 0=wK:Ex  
#ifdef _DEBUG #6Xs.*b5C  
#define new DEBUG_NEW SM[Bv9|0  
#undef THIS_FILE wV?,Z!\Z  
static char THIS_FILE[] = __FILE__; \qsw"B*tv`  
#endif KC e13!  
#define MAX_KEY 100 w",? Bef  
#define CTRLBIT 0x04 doHF|<s  
#define ALTBIT 0x02 4Z[V uQng  
#define SHIFTBIT 0x01 uhN%Aj\iu(  
#pragma data_seg("shareddata") bIt=v)%$  
HHOOK hHook =NULL; +b;hBb]R  
UINT nHookCount =0; Hy{ Q#fq  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Z,N$A7SBE  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3#wcKv%>&_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey I PE}gp  
static int KeyCount =0; M8w5Ob  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift fJjgq)9  
#pragma data_seg() 4VN aq<8  
HINSTANCE hins; P[t$\FS  
void VerifyWindow(); #s5 pz8v  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) l2b{u GE  
//{{AFX_MSG_MAP(CHookApp) *X%m@KLIKv  
// NOTE - the ClassWizard will add and remove mapping macros here. 4X NxI1w)  
// DO NOT EDIT what you see in these blocks of generated code! Z.Rb~n&  
//}}AFX_MSG_MAP &R+#W  
END_MESSAGE_MAP() 9?+9UlJ7K  
ba@ax3  
CHookApp::CHookApp() ps1YQ3Ep&  
{ >KG E-Yzj  
 // TODO: add construction code here, 4yMW^:@  
 // Place all significant initialization in InitInstance 2k7bK6=nm  
} zH)_vW  
B~r}c4R{7  
CHookApp theApp; " oy\_1|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >L((2wfiN  
{ &UAe!{E0  
 BOOL bProcessed=FALSE; z?8~[h{i%  
 if(HC_ACTION==nCode) 1S%k  
 { 9 -h.|T2il  
  if((lParam&0xc0000000)==0xc0000000){// Key up $%2_{m_K:p  
   switch(wParam) M%Ku5X6:/  
   { f F?6j   
    case VK_MENU: !7H6i#g*  
     MaskBits&=~ALTBIT; ed~R>F>  
     break; ]XUl@Y.   
    case VK_CONTROL: M\/XP| 7  
     MaskBits&=~CTRLBIT; ^. X[)U  
     break; !MZw#=D`  
    case VK_SHIFT: <MD;@_Nz\  
     MaskBits&=~SHIFTBIT; #,f{Ok+  
     break; NlR"$  
    default: //judge the key and send message -@%%*YI>  
     break; <SXZx9A!  
   } H^c0Kh+  
   for(int index=0;index<MAX_KEY;index++){ vM0_>1nN  
    if(hCallWnd[index]==NULL) V: p)m&y6  
     continue; ft5DU/%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =(U/CI  
    { "mj^+u-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Q49BU@xX  
     bProcessed=TRUE; H~+xB1  
    } +!>LY  
   } \tt'm\_  
  } 3_ 2hC!u!K  
  else if((lParam&0xc000ffff)==1){ //Key down 2PC5^Ni/9@  
   switch(wParam) P@ypk^v  
   { 4!%]fg}Um  
    case VK_MENU: y,C!9l  
     MaskBits|=ALTBIT; w-FnE}"l  
     break; k'13f,o}  
    case VK_CONTROL: xe:' 8J6L  
     MaskBits|=CTRLBIT; ;x[pM_  
     break; n E :'Zxj  
    case VK_SHIFT: = t+('  
     MaskBits|=SHIFTBIT; ,7/ _T\d<  
     break; *re 44  
    default: //judge the key and send message `"<2)yq?  
     break; ;<6"JP>0  
   } u^Sv#K X  
   for(int index=0;index<MAX_KEY;index++) Zw=G@4xoU  
   { Y}1 P~  
    if(hCallWnd[index]==NULL) D$pj#  
     continue; )mD \d|7f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) nk08>veG  
    { _ VKgs]Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zGs|DB  
     bProcessed=TRUE; : ^(nj7D  
    } ya>N.h  
   } K`+vfqX  
  } & l^n4  
  if(!bProcessed){ wXCyj+XB*  
   for(int index=0;index<MAX_KEY;index++){ 1M+Zkak7p  
    if(hCallWnd[index]==NULL) Ru7L>(Njs  
     continue; ) hdgz$cl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  GVp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); yV_ L/,6}D  
   } j;0ih_Z@4W  
  }  Ec.)!Hu  
 } wO.B~`y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]L]T>~X`  
} !u0U5>ccw  
; $6x=uZ  
BOOL InitHotkey() oP-;y&AS  
{ {d}26 $<$]  
 if(hHook!=NULL){ Su4h'&xx  
  nHookCount++; MgP{W=h2  
  return TRUE; Jk~UEqr+  
 } ,lP7 ri  
 else 8l?w=)Qy  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %JaE4&  
  if(hHook!=NULL) G;9|%yvd8  
   nHookCount++; wy\o*P9mG)  
  return (hHook!=NULL); |+mOH#Aty  
} 'Aet{A=9  
BOOL UnInit() |$w0+bV*  
{ g1dmkX  
 if(nHookCount>1){ <[FS%2,0mb  
  nHookCount--; j,ZW[*M  
  return TRUE; 69OET_AS>  
 } jQ^Yj"6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 5D-BIPn=JV  
 if(unhooked==TRUE){ Nq  U9/  
  nHookCount=0; kFnUJM$r  
  hHook=NULL; gm}C\q9  
 } _we3jzMW  
 return unhooked; B~BUW WMfp  
} mR6E]TuM  
i 63?"  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;]"n?uo  
{ ?^eJ:  
 BOOL bAdded=FALSE; @u<0_r t  
 for(int index=0;index<MAX_KEY;index++){ Hq79/ wKj  
  if(hCallWnd[index]==0){ I(y`)$}  
   hCallWnd[index]=hWnd; >Ziy1Dp  
   HotKey[index]=cKey; W|~q<},j  
   HotKeyMask[index]=cMask; -^y1iN'D  
   bAdded=TRUE; ScsWnZ  
   KeyCount++; @s3aR*ny$  
   break; J1& A,Gb  
  } #Xj;f^}/  
 } 1.uUMW  
 return bAdded; I"~xDa!  
} }q/(D?  
TR+Q4Y:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) % d4+Ctrp-  
{ *C tsFS~  
 BOOL bRemoved=FALSE; ;}n|,g>  
 for(int index=0;index<MAX_KEY;index++){ .59KE]u  
  if(hCallWnd[index]==hWnd){ 4;",@}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ J,.j_ii`!  
    hCallWnd[index]=NULL; 6zELe.tq  
    HotKey[index]=0; !4i,%Z& 6  
    HotKeyMask[index]=0; Q|6Ls$'$  
    bRemoved=TRUE; .Gjr`6R  
    KeyCount--; YLD-SS[/>  
    break; @Pd) %'s  
   } )R8%wk?2  
  } X v`2hf  
 } qr7 X-[&  
 return bRemoved; t$ACQ*O  
} Ty g$`\#   
TW'E99wG  
void VerifyWindow() w++B-_  
{ 0\8*S3,q  
 for(int i=0;i<MAX_KEY;i++){ A73V6"  
  if(hCallWnd!=NULL){ 4Z<]4:o  
   if(!IsWindow(hCallWnd)){ Aqx3!  
    hCallWnd=NULL; /5L'9e  
    HotKey=0; *#ob5TBq[  
    HotKeyMask=0; !C9ps]6  
    KeyCount--; !N@S^JD6  
   } !:]s M-cCt  
  }  ;Puy A  
 } i*mZi4URN  
} Y&K<{ KA\4  
lBizC5t!o  
BOOL CHookApp::InitInstance() BXQ\A~P\  
{ P5yJO97  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); SH@  
 hins=AfxGetInstanceHandle(); =;'ope(?S  
 InitHotkey(); 7/5NaUmPTt  
 return CWinApp::InitInstance(); s$SU vo1J  
} CF4Oh-f  
1]D/3!  
int CHookApp::ExitInstance() J};u25:}  
{ knNhN=hG+  
 VerifyWindow(); P3,Z5|)  
 UnInit(); D[>XwL  
 return CWinApp::ExitInstance(); &;r'{$  
} -z>Z0viA  
+SZ%&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file i5L+8kx4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) I>YtWY|ed  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ SG(%d^x`R  
#if _MSC_VER > 1000 Allt]P>  
#pragma once qb>|n1F_  
#endif // _MSC_VER > 1000 0x3 h8fs  
^5FJ}MMJf  
class CCaptureDlg : public CDialog eCPKpVhP  
{ 6\)8mK  
 // Construction Q*mMF@-:  
 public: u@:=qd=\  
  BOOL bTray; G>_42Rp  
  BOOL bRegistered; B4\:2hBq  
  BOOL RegisterHotkey(); @Le ^-v4  
  UCHAR cKey; 8vX*SrM  
  UCHAR cMask; `/gEKrhL-  
  void DeleteIcon(); K 8yyxJ  
  void AddIcon(); X,iuz/Q  
  UINT nCount; 3u"J4%zg|L  
  void SaveBmp(); Lv,ji_  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor "I}'C^gP  
  // Dialog Data L8?Z!0D/h  
  //{{AFX_DATA(CCaptureDlg) 4? /ot;>2  
  enum { IDD = IDD_CAPTURE_DIALOG }; y ? {PoNI  
  CComboBox m_Key; 5wE !_ng>|  
  BOOL m_bControl; +*:x#$phx  
  BOOL m_bAlt; !7,K9/"  
  BOOL m_bShift; 2o s6c te  
  CString m_Path; =xlYQ}-(a  
  CString m_Number; !5' 8a5  
  //}}AFX_DATA yoA*\V  
  // ClassWizard generated virtual function overrides  2U+z~  
  //{{AFX_VIRTUAL(CCaptureDlg) -f|+  
 public: i-"h"nF"  
  virtual BOOL PreTranslateMessage(MSG* pMsg); KoQ_: `  
 protected: ;2xXX,'R7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #(7RX}  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z*k 3q`=>  
  //}}AFX_VIRTUAL *C:q _/  
  // Implementation vCU&yXGl  
 protected: \.{pZMM  
  HICON m_hIcon; 4~pO>6P   
  // Generated message map functions tWX+\ |  
  //{{AFX_MSG(CCaptureDlg) R2H\;N  
  virtual BOOL OnInitDialog(); ~_l: b  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Jk6/i;4|  
  afx_msg void OnPaint(); 2sd=G'7!  
  afx_msg HCURSOR OnQueryDragIcon(); I!0$% ]F  
  virtual void OnCancel(); ~V$5m j   
  afx_msg void OnAbout(); n.H`1@  
  afx_msg void OnBrowse(); a\.OL}"   
  afx_msg void OnChange(); `v/tf|v 6  
 //}}AFX_MSG J\,e/{,X  
 DECLARE_MESSAGE_MAP() :EldP,s#x%  
}; Z]>e& N  
#endif BKP!+V/  
?[>BssW  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file s)7`r6w  
#include "stdafx.h" @}rfY9o'  
#include "Capture.h" K?9H.#(  
#include "CaptureDlg.h" GL0':LsZ  
#include <windowsx.h> |sZ9 /G7  
#pragma comment(lib,"hook.lib") CPCB!8-5  
#ifdef _DEBUG o'}Z!@h  
#define new DEBUG_NEW fS$Yl~-m?  
#undef THIS_FILE WZO 0u  
static char THIS_FILE[] = __FILE__; k3|9U'r!c  
#endif XuAc3~HAd  
#define IDM_SHELL WM_USER+1 zm^p7&ak$  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6V_5BpXt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M+&eh*:z:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Z_ *ZUN?B  
class CAboutDlg : public CDialog N|# x9mE  
{ l=OC?d*m  
 public: E":":AC#  
  CAboutDlg(); F9G$$%Q-Z  
  // Dialog Data O7_NXfh|  
  //{{AFX_DATA(CAboutDlg) HBkQ`T  
  enum { IDD = IDD_ABOUTBOX }; i~PZvxt  
  //}}AFX_DATA Q^5 t]HKn  
  // ClassWizard generated virtual function overrides 2!& ;ZcT,  
  //{{AFX_VIRTUAL(CAboutDlg) E ^>7jf09,  
 protected: Vh-h{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .;sPG  
  //}}AFX_VIRTUAL :95_W/l  
  // Implementation HE .Dl7 {  
 protected: Rn ^N+3o'M  
  //{{AFX_MSG(CAboutDlg) ZFw743G  
  //}}AFX_MSG ~CTRPH   
  DECLARE_MESSAGE_MAP() Yy:sZJ  
}; j3'/jk]\  
K?<Odw'k  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) SxQDqoA~  
{ 4 6JP1  
 //{{AFX_DATA_INIT(CAboutDlg) ll^O+>1dO  
 //}}AFX_DATA_INIT F,$$N>  
} `-e}:9~q  
0 #; s{7k  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .:Xe*Q  
{ jtCob'n8  
 CDialog::DoDataExchange(pDX); jS)-COk  
 //{{AFX_DATA_MAP(CAboutDlg) [9Hm][|Ph  
 //}}AFX_DATA_MAP Tfs9< k>G#  
} ?4dd|n  
78A4n C  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 'n`$c{N<tM  
 //{{AFX_MSG_MAP(CAboutDlg) q:eAL'OkM  
 // No message handlers lcLxqnv  
 //}}AFX_MSG_MAP l@9:V hU(  
END_MESSAGE_MAP() u"3cSuqy  
E0'6!9y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) BU .G~0  
: CDialog(CCaptureDlg::IDD, pParent) rMx_ <tXX  
{ 1KEPD@0oxx  
 //{{AFX_DATA_INIT(CCaptureDlg) |-?b)yuAz  
  m_bControl = FALSE; $9b6,Y_-  
  m_bAlt = FALSE; ITOGD  
  m_bShift = FALSE; %[;KO&Ga  
  m_Path = _T("c:\\"); dz DssAHy  
  m_Number = _T("0 picture captured."); ?["ZEa  
  nCount=0; zXO.NSC[  
  bRegistered=FALSE; 0;`PHNBq  
  bTray=FALSE; 6H9]]Unju  
 //}}AFX_DATA_INIT +w/o  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 iTyApLV  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :\cJ vm  
} 4iPg_+  
t38T0Ao  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) U%olH >1K  
{ {uG_)GFr0  
 CDialog::DoDataExchange(pDX); 27gm_ *  
 //{{AFX_DATA_MAP(CCaptureDlg) 79fg%cSb  
  DDX_Control(pDX, IDC_KEY, m_Key); cZ,_O~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); L~zet-3UNf  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9dv~WtH>5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9tgkAU`  
  DDX_Text(pDX, IDC_PATH, m_Path); 8gdOQ=a  
  DDX_Text(pDX, IDC_NUMBER, m_Number); my0->W%L  
 //}}AFX_DATA_MAP hWJc A.A  
} x F#)T *  
 )BB a  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D[?|\?  
//{{AFX_MSG_MAP(CCaptureDlg) lD XH<W?  
 ON_WM_SYSCOMMAND() S^.=j oI  
 ON_WM_PAINT() {,-#;A*yW  
 ON_WM_QUERYDRAGICON() djp(s$:{4  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) .YlM'E*X  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Hs`  '](  
 ON_BN_CLICKED(ID_CHANGE, OnChange) lUz@Em  
//}}AFX_MSG_MAP $<#sCrNX  
END_MESSAGE_MAP() R&p53n  
_Fjv.VQ,  
BOOL CCaptureDlg::OnInitDialog() _XtY/7n  
{ P&VI2k  
 CDialog::OnInitDialog();  0]HI c  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); wOP}SMn  
 ASSERT(IDM_ABOUTBOX < 0xF000); TjdYCk]'  
 CMenu* pSysMenu = GetSystemMenu(FALSE); b/`' ?| C  
 if (pSysMenu != NULL) cPSpPx  
 { Dr<Bd;)  
  CString strAboutMenu; UK/k?0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); fQh!1R  
  if (!strAboutMenu.IsEmpty()) &~EOM  
  { &iivSc;#  
   pSysMenu->AppendMenu(MF_SEPARATOR); V7<} ;Lzm  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1+Oo Qs  
  } t/ w>t! q  
 } .u&g2Y  
 SetIcon(m_hIcon, TRUE); // Set big icon jw)t"S/E  
 SetIcon(m_hIcon, FALSE); // Set small icon c"r( l~fc  
 m_Key.SetCurSel(0); D]REZuHOI  
 RegisterHotkey(); c2QC`h(Wb  
 CMenu* pMenu=GetSystemMenu(FALSE); j~0hAKHG  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); BN0))p  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); j.sf FS  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,==lgM2V>  
 return TRUE; // return TRUE unless you set the focus to a control e"Z~%,^A  
} 9b>a<Z  
cD]t%`*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) nBd;d}LD  
{ <\u%ZB  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #+$z`C`  
 { mb/Y  
  CAboutDlg dlgAbout; .+.Pc_fv  
  dlgAbout.DoModal(); ygHNAQG~  
 } Y|",.~  
 else HDYoM  
 { {v(3[ 7  
  CDialog::OnSysCommand(nID, lParam); \VW.>@s~  
 } b.F2m(e2  
} U}NNb GQj  
'(?@R5a  
void CCaptureDlg::OnPaint() Z=ho7i  
{ xZhh%~  
 if (IsIconic()) xJ4T7 )*  
 { <5 okwcJ^  
  CPaintDC dc(this); // device context for painting JP#m} W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z"A:^jZ<s  
  // Center icon in client rectangle vjWS35i  
  int cxIcon = GetSystemMetrics(SM_CXICON); I>:'5V  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2HUoT\M  
  CRect rect; NoI=t  
  GetClientRect(&rect); <=p"c k@  
  int x = (rect.Width() - cxIcon + 1) / 2; >%{h_5  
  int y = (rect.Height() - cyIcon + 1) / 2; r*$KF!-dg  
  // Draw the icon K-K+%U  
  dc.DrawIcon(x, y, m_hIcon); |@ia(U~  
 } Zscmc;G  
 else b8O:@j2  
 { r3|vu"Uei  
  CDialog::OnPaint(); ^7=yjD`  
 } ^#;2 Pd>  
} 8YCtU9D  
kj>XKZL10  
HCURSOR CCaptureDlg::OnQueryDragIcon() qRNGe8  
{ OA[w|Tt  
 return (HCURSOR) m_hIcon; *M&~R(TMn  
} I\":L  
#;+GNF}0mG  
void CCaptureDlg::OnCancel() ${ e{#  
{ 07n=H~yU  
 if(bTray) yQ\c<z^e  
  DeleteIcon(); pDW .Pav  
  CDialog::OnCancel(); LqW~QEU(  
} L,n'G%  
?'^xO:  
void CCaptureDlg::OnAbout() RE*;nSVFt  
{ S);bcowf_  
 CAboutDlg dlg; t~e.LxN  
 dlg.DoModal(); s3oK[:/  
} y/E%W/3  
1--5ok h  
void CCaptureDlg::OnBrowse() y "gYv  
{ 0&zp9(G5  
 CString str; tMC<\e  
 BROWSEINFO bi; )%P!<|s:5  
 char name[MAX_PATH]; g+U6E6}1  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); (|<}q-wO  
 bi.hwndOwner=GetSafeHwnd(); ge*f<#|0U-  
 bi.pszDisplayName=name; dQTJC %]O  
 bi.lpszTitle="Select folder"; !M\8k$#"n  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ^C_ ;uz  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); g\GuH?|   
 if(idl==NULL) <\Lii0hi!  
  return; J&2cf#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); uK1DC i  
 str.ReleaseBuffer(); o^H.uBO{  
 m_Path=str; /a Nlr>^  
 if(str.GetAt(str.GetLength()-1)!='\\') 5@6F8:x}V  
  m_Path+="\\"; ,x&T8o/a  
 UpdateData(FALSE); -6@#Nq_iWU  
} v:|_!+g:  
yO.q{|kX  
void CCaptureDlg::SaveBmp() vjmNS=l  
{ a/ ^ojn  
 CDC dc; e+Vn@-L;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !UDTNF?1  
 CBitmap bm; 6C7|e00v  
 int Width=GetSystemMetrics(SM_CXSCREEN); S8 .1%sw  
 int Height=GetSystemMetrics(SM_CYSCREEN); )T&ZiHIJ3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); nW1u;.  
 CDC tdc; }Ox5,S}ra  
 tdc.CreateCompatibleDC(&dc); C/_Z9LL?F  
 CBitmap*pOld=tdc.SelectObject(&bm); t}w<xe  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); NU"Ld+gw  
 tdc.SelectObject(pOld); #? u#=]  
 BITMAP btm; #%5[8~&  
 bm.GetBitmap(&btm); eaB6e@]@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; K+|G9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G LU7?2`t  
 BITMAPINFOHEADER bih; >{R+j4%  
 bih.biBitCount=btm.bmBitsPixel; )jm!bR`  
 bih.biClrImportant=0; 2D;2QdO  
 bih.biClrUsed=0; J;wDvt]]1  
 bih.biCompression=0; WstX>+?'  
 bih.biHeight=btm.bmHeight; /#TtAkH  
 bih.biPlanes=1; V96:+r  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7!F<Uf,V3  
 bih.biSizeImage=size; #l 7(W G  
 bih.biWidth=btm.bmWidth; M 5c$  
 bih.biXPelsPerMeter=0; P.#@1_:gC  
 bih.biYPelsPerMeter=0; ZW>iq M^9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); h\-3Y U  
 static int filecount=0; q[}W&t,  
 CString name;  |pgrR7G'  
 name.Format("pict%04d.bmp",filecount++); ;T hn C>U  
 name=m_Path+name; 6 9+Pf*  
 BITMAPFILEHEADER bfh; 0H!J  
 bfh.bfReserved1=bfh.bfReserved2=0; &+|bAn9AJ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5LaF'>1yY  
 bfh.bfSize=54+size; y?OK#,j  
 bfh.bfOffBits=54; Jo'~oZ$  
 CFile bf; e5 N$+P"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ MMU>55+-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); T0|hp7WM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _*w kTI+j  
  bf.WriteHuge(lpData,size); FQ_a= v  
  bf.Close(); adY ,Nz  
  nCount++; P1_6:USBM  
 } PjE%_M<  
 GlobalFreePtr(lpData); M.qE$  
 if(nCount==1) 3;?DKRIcX  
  m_Number.Format("%d picture captured.",nCount); z"\<GmvB  
 else lK Ry4~O  
  m_Number.Format("%d pictures captured.",nCount); ^UmhSxQ##  
  UpdateData(FALSE); r;~7$B)  
} `|p8zV  
+OaBA>Jh9  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0u}+n+\g  
{ }Jo}K) >!  
 if(pMsg -> message == WM_KEYDOWN) ^V0I!&7lx  
 { O[+\` 63F=  
  if(pMsg -> wParam == VK_ESCAPE) Esdv+f}4;  
   return TRUE; s:xt4<  
  if(pMsg -> wParam == VK_RETURN) )0o|u>  
   return TRUE; 9}T(m(WQVu  
 } 7Vo[zo  
 return CDialog::PreTranslateMessage(pMsg); Z{^Pnit  
} :Qu.CvYF  
RveEA/&&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .R^q$U~v3  
{ a(_3271  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6m0- he~  
  SaveBmp(); Dc9Fb^]QOG  
  return FALSE; .h-k*F0Ga)  
} Bq~?!~\?.  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ k $E{'Dv  
 CMenu pop; H2{&da@D5  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $Yj4&Two<  
 CMenu*pMenu=pop.GetSubMenu(0); Og1Hg B3v  
 pMenu->SetDefaultItem(ID_EXITICON); .2 }5Dc,eR  
 CPoint pt; u}-)ywX  
 GetCursorPos(&pt); GrA}T`]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ow9Vj$m  
 if(id==ID_EXITICON) m!WDXt  
  DeleteIcon(); MZt&HbD-  
 else if(id==ID_EXIT) mr+8[0  
  OnCancel(); ;y.<I&  
 return FALSE; ~>u u1[ /  
} /h,-J8[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); pnGDM)H7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) m }\L i]  
 AddIcon(); |?LUt@r;  
 return res; /mQ9} E4X  
} Lf+3nN  
-:Jn|=  
void CCaptureDlg::AddIcon() nXW]9zC"/  
{ w1)SuMFK_  
 NOTIFYICONDATA data; ;m}o$`  
 data.cbSize=sizeof(NOTIFYICONDATA); Fv3:J~Yf  
 CString tip; xHaoSs*C9  
 tip.LoadString(IDS_ICONTIP); !}J19]\  
 data.hIcon=GetIcon(0); 84c[Z   
 data.hWnd=GetSafeHwnd(); TnLblkX  
 strcpy(data.szTip,tip); (*G'~gSX  
 data.uCallbackMessage=IDM_SHELL; h5ZxxtGU  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (h27SLYm  
 data.uID=98; <xAlp;8m5  
 Shell_NotifyIcon(NIM_ADD,&data); ^"4u1  
 ShowWindow(SW_HIDE); wi S8S{K5  
 bTray=TRUE; }J] P`v  
} nEh^{6  
.GuZV'  
void CCaptureDlg::DeleteIcon() C72btS  
{ 2"B3Q:0he|  
 NOTIFYICONDATA data; _R;+}1G/  
 data.cbSize=sizeof(NOTIFYICONDATA); hJ0m;j&4y  
 data.hWnd=GetSafeHwnd(); n4G53+y'  
 data.uID=98; 5h>t4 [~  
 Shell_NotifyIcon(NIM_DELETE,&data); G9jlpf5>  
 ShowWindow(SW_SHOW); } bEu+bZ  
 SetForegroundWindow(); WyJXT.  
 ShowWindow(SW_SHOWNORMAL); m NApFwZ  
 bTray=FALSE; {#%;HqP  
} dWhF[q"  
2O)2#N  
void CCaptureDlg::OnChange() fa;GM7<e)  
{ 21G:!t4/?n  
 RegisterHotkey(); z,/y2H2  
} Y^CbpG&-vC  
me/ae{  
BOOL CCaptureDlg::RegisterHotkey() `-)Fx<e  
{ Jul xFjC  
 UpdateData(); pd X"M>  
 UCHAR mask=0; ?u8 vK<2h  
 UCHAR key=0; 7`6JK  
 if(m_bControl) ^Sz?c_<2P  
  mask|=4; kEs=N(  
 if(m_bAlt) . G ~,h  
  mask|=2; .j0]hn]  
 if(m_bShift) Zc57]~  
  mask|=1; d<l-Ldle  
  key=Key_Table[m_Key.GetCurSel()]; 9=Rj9%  
 if(bRegistered){ cP MUu9du  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); AAt<{  
  bRegistered=FALSE; Gg9NG`e6I  
 } G0eJ<*|_ 3  
 cMask=mask; y i/jZX  
 cKey=key; rKys:is  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $\@yH^hL  
 return bRegistered; a4M`Bk;mb  
} {bvm83{T  
^6 sT$set  
  四、小结 J8yi#A>+  
c{t[iXDG  
  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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