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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: 1OL~)X3  
  S22; g  
  一、实现方法 uIwyan-  
>o7k%T|l$  
  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: 95&HsgdxJ  
']D( ({%g  
#pragma data_seg("shareddata") 8hT>)WH}wo  
HHOOK hHook =NULL; //钩子句柄 LlqhZetS  
UINT nHookCount =0; //挂接的程序数目 .&dcJh*O+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 fok#D>q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (*tJCz`Sj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey UW3F)  
static int KeyCount =0; WG n1pW  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 "$Q Gifb  
#pragma data_seg() ~Sq >c3Wn  
DK1)9<  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 }OFk.6{{&v  
CcQ|0  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: hSH-Ck@Qy  
'fsOKx4Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L|?tcic  
cKey,UCHAR cMask) %Et]w  
{ yAe}O#dy  
 BOOL bAdded=FALSE; 'l;|t"R12  
 for(int index=0;index<MAX_KEY;index++){ @pz2}Hd |  
  if(hCallWnd[index]==0){ *UC^&5:  
   hCallWnd[index]=hWnd; @ XMC$s  
   HotKey[index]=cKey; oJy/PR 3  
   HotKeyMask[index]=cMask; {HeMdGn9  
   bAdded=TRUE; kOO2 ?L|Z  
   KeyCount++; "'L SLp  
   break; 2]wh1)  
  } ]&>)=b!,  
 } #96a7K  
 return bAdded; Y*f<\z(4  
} LTHS&3% 2  
//删除热键 S;~_9i]upe  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I%Z &i-33y  
{ b`mEnI VIz  
 BOOL bRemoved=FALSE; Pc<ZfO #  
 for(int index=0;index<MAX_KEY;index++){ P+a&R<Dj4  
  if(hCallWnd[index]==hWnd){ JAK*HA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ zZ63 P  
    hCallWnd[index]=NULL; T5)?6i -N  
    HotKey[index]=0; dWA7U6c<  
    HotKeyMask[index]=0; "cx" d:  
    bRemoved=TRUE; m" Gr pE3  
    KeyCount--; :&MiO3#+  
    break; 2S3F]fG0  
   } B!0[LlF+  
  } y\x<!_&D  
 } (WC<XKf  
 return bRemoved; M-_)CR  
} sr4K-|@  
Zh$Z$85p  
~7v^7;tT  
  DLL中的钩子函数如下: p-Ju&4fS  
2bmppDk  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Uka 4iya  
{ 5:wf"3%%  
 BOOL bProcessed=FALSE; `XQ5>c  
 if(HC_ACTION==nCode) _19k@a  
 { 9 +6"<r!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 vs +N{ V  
   switch(wParam) W+vm!7wX0  
   {  iBQftq7  
    case VK_MENU: O1A*-G:X  
     MaskBits&=~ALTBIT; i~4Kek6,I  
     break; w}iflAnjq  
    case VK_CONTROL: !?96P|G  
     MaskBits&=~CTRLBIT; @47TDCr  
     break; HhO$`YZ%>  
    case VK_SHIFT: 8wOr`ho B  
     MaskBits&=~SHIFTBIT; ]?2AFkF  
     break; XB?!V|bno  
    default: //judge the key and send message KE_Ze\ P  
     break; Y*6*;0Kx  
   } *T3"U|0_y  
   for(int index=0;index<MAX_KEY;index++){ n(L {2r  
    if(hCallWnd[index]==NULL) Z(s} #-  
     continue; J0`?g6aY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8^T' a^Wt  
    { ?~$y3<[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2-]m#}zbP  
     bProcessed=TRUE; |Z<adOg  
    } b$BUo8O}  
   } z9gZ/d   
  } S9.jc@#.`  
  else if((lParam&0xc000ffff)==1){ //有键按下 +{s^"M2`  
   switch(wParam) aaBBI S  
   { S"dQ@r9  
    case VK_MENU: C9fJLCufC  
     MaskBits|=ALTBIT; 3jQ |C=   
     break; I^o^@C  
    case VK_CONTROL: 975KRnj  
     MaskBits|=CTRLBIT; rpvm].4  
     break; L:31toGK  
    case VK_SHIFT: _T1e##Sq,  
     MaskBits|=SHIFTBIT; '{|87kI  
     break; Cs$g]&a  
    default: //judge the key and send message t6tqv  
     break; #(7OvW+y  
   } GxBj N7"  
   for(int index=0;index<MAX_KEY;index++){ /a,q4tD@  
    if(hCallWnd[index]==NULL) ,Vogo5~X  
     continue; (wTg aV1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R75sK(oS  
    { te`4*t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); It4F;Ah  
     bProcessed=TRUE; {uw]s< 6  
    } tlW}lN}  
   } 5\pizD/17  
  } KS%,N _F<  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 DP?gozm  
   for(int index=0;index<MAX_KEY;index++){ Zy<0'k%U  
    if(hCallWnd[index]==NULL) $h2h&6mH  
     continue; !({[^[!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) WA<~M) rb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4)`{ L$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Aam2Y,B  
   } v>,XJ7P  
  } % $J^dF_0  
 } -v]7}[ .[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Q>|<R[.7  
} V Bg\)r[  
p4/D%*G^`  
  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: ;2U`?"  
0g1uM:;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ] `lTkh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O)hNHIF  
iM\W"OUl[  
  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: RW3&]l=  
<h^vl-L>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ZqSczS7uf  
{ i6[Hu8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Ts.6 1Rx  
 { oRCj]9I$  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 XX+4X*(o  
  SaveBmp(); ^mH^cP?/  
  return FALSE; \=w|Zeu{l  
 } ^JH 4: h  
 …… //其它处理及默认处理 rx%lL  
} x]F:~(P  
M]oaWQu  
wE'~Qj  
  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。 &n['#7 <(!  
WXJ%bH  
  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。 q$\KE4v"  
7r:!HmRl  
  二、编程步骤 /CH*5w)1   
BYRf MtT@+  
  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"; P#iBwmwN+.  
:X+7}!Wlo  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; &)1+WrU  
mzDbw-#  
  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; @<h@d_8^k  
H>2)R 7h  
  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;   \\6/"  
PKmr5FB  
  5、 添加代码,编译运行程序。 Y\s@'UoVN  
<&B)i\j8=b  
三、程序代码 G/b $cO}  
,|D<De\v&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL '?4B0=  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "HlT-0F  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1a`dB ~>  
#if _MSC_VER > 1000 WSUU_^.  
#pragma once n%A)#AGGc  
#endif // _MSC_VER > 1000 u`g|u:(r  
#ifndef __AFXWIN_H__  {ZB7,\  
#error include 'stdafx.h' before including this file for PCH nzU^G)  
#endif "OkJPu2!W  
#include "resource.h" // main symbols Nv w'[?m  
class CHookApp : public CWinApp !ouJ3Jn   
{ |%Pd*yZA  
 public: CnN PziB  
  CHookApp(); ~8Z)e7 j  
  // Overrides `C$.  
  // ClassWizard generated virtual function overrides ,-D3tleu`  
  //{{AFX_VIRTUAL(CHookApp) Ns Pt1_ Y8  
 public: n' &:c}zKO  
  virtual BOOL InitInstance(); `-IX"rf  
  virtual int ExitInstance(); lx(kbSxF  
  //}}AFX_VIRTUAL ibha`  
  //{{AFX_MSG(CHookApp) T:dV[3  
  // NOTE - the ClassWizard will add and remove member functions here. "|`euxYV  
  // DO NOT EDIT what you see in these blocks of generated code ! cJ=0zEv  
  //}}AFX_MSG x:4 :G(  
  DECLARE_MESSAGE_MAP() @!`x^Tzz  
}; 4YMX;W  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N 8 n`f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^O}`i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )CKPzNf  
BOOL InitHotkey(); ^z)p@sk#  
BOOL UnInit(); O!#r2Y"?K1  
#endif '| WY 2>/(  
,#m:U5#h  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {W,&jC  
#include "stdafx.h" *d b,N'rK  
#include "hook.h" fgdqp8~  
#include <windowsx.h> h8'`g 0  
#ifdef _DEBUG bL-+  
#define new DEBUG_NEW dD ?ZF6  
#undef THIS_FILE b*(74>XY  
static char THIS_FILE[] = __FILE__; E+)3n[G  
#endif n 'gU  
#define MAX_KEY 100 ir !/{IQx  
#define CTRLBIT 0x04 4d-f 6iiFV  
#define ALTBIT 0x02 ~lib~Y'-  
#define SHIFTBIT 0x01 it77x3Mm F  
#pragma data_seg("shareddata") c&X2k\  
HHOOK hHook =NULL; ^ZuwUuuf  
UINT nHookCount =0; ebfT%_N  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 05hjC  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT LD/NMb  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey lub_2Cb|j  
static int KeyCount =0; Q #IlUo  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift x4v@o?zW  
#pragma data_seg() fRh}n ^X  
HINSTANCE hins; ZD~ra7  
void VerifyWindow(); {9B"'65o  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) :8=7)cW  
//{{AFX_MSG_MAP(CHookApp) j]P'xrWl]8  
// NOTE - the ClassWizard will add and remove mapping macros here. (X zy~l<  
// DO NOT EDIT what you see in these blocks of generated code! <x-7MU&  
//}}AFX_MSG_MAP /0CS2mLC  
END_MESSAGE_MAP() *!NxtB!LC  
{#y~ Qk;T  
CHookApp::CHookApp() x18(}4  
{ XtCG.3(LY  
 // TODO: add construction code here, _xY dnTEl  
 // Place all significant initialization in InitInstance p4-UW;Xu  
} n37P$0  
:<gC7UW  
CHookApp theApp; XCvL`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Cg_9V4h.C  
{ u'`eCrKT*  
 BOOL bProcessed=FALSE; SFJ"(ey$  
 if(HC_ACTION==nCode) lV".-:u_  
 { q]Vxf!0*>  
  if((lParam&0xc0000000)==0xc0000000){// Key up _TntZv.?  
   switch(wParam) #;D@`.#\  
   { z>]P_E~`}  
    case VK_MENU: nEHmiG  
     MaskBits&=~ALTBIT; y~Z7sx0  
     break; ghU~H4[xD  
    case VK_CONTROL: y7^E`LKK  
     MaskBits&=~CTRLBIT; qBF6LhR  
     break; i+90##4<?  
    case VK_SHIFT:  Z2a~1BL  
     MaskBits&=~SHIFTBIT; 7w\L<vFm  
     break; };Pdn7;1G:  
    default: //judge the key and send message {^":^N)  
     break; {'cm;V+  
   } fj|X`,TiZ;  
   for(int index=0;index<MAX_KEY;index++){ cS#yfN,  
    if(hCallWnd[index]==NULL) T {:8,CiW  
     continue; U'@#n2p:k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +N}yqgE  
    { 8Wba Hw_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Uz =OTM  
     bProcessed=TRUE; \r1nMw3&  
    } LIE5of  
   } d0V*[{  
  } 7y4jk  
  else if((lParam&0xc000ffff)==1){ //Key down \&/V p`  
   switch(wParam) X6<Ds'I  
   { l#IN)">1  
    case VK_MENU: YJGP8  
     MaskBits|=ALTBIT; otA'+4\  
     break; G4rd<V0[D  
    case VK_CONTROL: m`BE{%  
     MaskBits|=CTRLBIT; |BBo  
     break; $+|. @ss  
    case VK_SHIFT: E5qt~:C|  
     MaskBits|=SHIFTBIT; IN_O!c0e  
     break; Z H2   
    default: //judge the key and send message a(IUAh*mO  
     break; XM f>B|  
   } LEuDDJ -  
   for(int index=0;index<MAX_KEY;index++) x3:d/>b  
   { ZiW&*nN?M  
    if(hCallWnd[index]==NULL) i^@hn>s$  
     continue; f|6 Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J\Db8O-/x4  
    { ^P|Zze zwU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); } _=h]|6t  
     bProcessed=TRUE; NY?pvb  
    } 'i <%kL@  
   } &'k:?@J[  
  } $MqEM~^=  
  if(!bProcessed){ !K6:5V%q$  
   for(int index=0;index<MAX_KEY;index++){ ";jKTk7  
    if(hCallWnd[index]==NULL) h0] bIT{  
     continue; [gGo^^aW#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k%R(Qga  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qnFg7X>C,  
   } j1 H eX  
  } ` ZBOaN^if  
 } ^EJ]LNk }  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vddl9"V)  
} C<#_1@^:8e  
h t3P@;  
BOOL InitHotkey() +w?-#M#  
{ !t[;~`d9  
 if(hHook!=NULL){ qND:LP\_v  
  nHookCount++; SohNk9u[8  
  return TRUE; e(I;[G +%,  
 } </pt($  
 else @HE<\Z{ KI  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); .P#t"oW}  
  if(hHook!=NULL) uuQsK. S  
   nHookCount++; _ h/:r1  
  return (hHook!=NULL); xb2j |KY7  
} *B)10R  
BOOL UnInit() NIAji3  
{ >9y!M'V  
 if(nHookCount>1){ %?3$~d\n  
  nHookCount--; jx'hxC'3  
  return TRUE; 0a9[}g1=#  
 } l{QlJ>%~{;  
 BOOL unhooked = UnhookWindowsHookEx(hHook); BCO (,k  
 if(unhooked==TRUE){ dVMLn4[,MA  
  nHookCount=0; >>c%I c  
  hHook=NULL; tkQrxa|  
 } !yvw5As%  
 return unhooked; liBFx6\"S  
} kzVK%[/  
&oE'|^G  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {11 3B)  
{  ;{Yr|  
 BOOL bAdded=FALSE; Y4+iNdd  
 for(int index=0;index<MAX_KEY;index++){ !$/P8T``M  
  if(hCallWnd[index]==0){ 7pN&fAtj/  
   hCallWnd[index]=hWnd; n\< uT1n  
   HotKey[index]=cKey; r`$P60,@C  
   HotKeyMask[index]=cMask; c_t7<  
   bAdded=TRUE; MO? }$j  
   KeyCount++; )Fw#]~Z  
   break; y Ni3@f  
  } hY/qMK5  
 } Kpkpr`:)]  
 return bAdded;  He%v4S  
} >3,}^`l  
@YVla !5O@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ( G~ME>  
{ _$/Bt?h  
 BOOL bRemoved=FALSE; ?4#  
 for(int index=0;index<MAX_KEY;index++){ :;;k+Sw3  
  if(hCallWnd[index]==hWnd){ a^Z=xlJ/uZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %!DTq`F  
    hCallWnd[index]=NULL; .@\(ay  
    HotKey[index]=0; ] f5vk  
    HotKeyMask[index]=0; K+d{R=s^  
    bRemoved=TRUE; (:^YfG~e  
    KeyCount--; 5~$WSL?O)  
    break; HIUP =/x  
   } zCv)%y  
  } (1[Z#y[  
 } lR/Uboyy  
 return bRemoved; XtE O)  
} {b-SK5%]L  
nkz<t   
void VerifyWindow() xVrLoAw  
{ ]z2x`P^oI  
 for(int i=0;i<MAX_KEY;i++){ 2&=CC4<!d  
  if(hCallWnd!=NULL){ %q.5; L  
   if(!IsWindow(hCallWnd)){ |[p]]) o  
    hCallWnd=NULL; A8k $.E  
    HotKey=0; k@pEs# a  
    HotKeyMask=0; G *<g%"  
    KeyCount--; T+S\'f\  
   } RB6TM  
  } nm)/BK  
 } JEK_W<BD  
} <<V"4 C2  
wv=U[:Y  
BOOL CHookApp::InitInstance() i ~)V>x  
{ 4pZKm-dM^  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~+,ZD)AKi4  
 hins=AfxGetInstanceHandle(); jAovzZ6BL  
 InitHotkey(); %zR5q  Lb  
 return CWinApp::InitInstance(); [;l;kom  
} 1r5Z$3t\  
f%JM a]yV  
int CHookApp::ExitInstance() =BbXSwv'(  
{ 8Pva]Q  
 VerifyWindow(); 7jr+jNsowj  
 UnInit(); hu7o J H  
 return CWinApp::ExitInstance(); 2@Q5Ta #h  
} ].Ra=^q  
.krEfY&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file i>C%[dk9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) bM }zGFt  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ C' WX$!$d  
#if _MSC_VER > 1000 3lKs>HE0  
#pragma once />uE)R$  
#endif // _MSC_VER > 1000 EWXv3N2)  
y3bL\d1  
class CCaptureDlg : public CDialog +Y2D @K?)  
{ ~Q]/=HK  
 // Construction mE'HRv  
 public: H_ NoW  
  BOOL bTray; xgtx5tg  
  BOOL bRegistered; ~S<}q6H.  
  BOOL RegisterHotkey(); 9yu#G7  
  UCHAR cKey; 'j?H >'t{  
  UCHAR cMask; Hn/V*RzQ  
  void DeleteIcon(); crx%;R   
  void AddIcon(); |QQ(1#d  
  UINT nCount; ys:F  
  void SaveBmp(); k^#*x2b  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4^9qs%&  
  // Dialog Data iG"1~/U  
  //{{AFX_DATA(CCaptureDlg) uz:r'+v  
  enum { IDD = IDD_CAPTURE_DIALOG }; x7i,jMR  
  CComboBox m_Key; :*R+ee,& -  
  BOOL m_bControl; o#D'"Tn!  
  BOOL m_bAlt; oW>e.}d!  
  BOOL m_bShift; dnM.  
  CString m_Path; P,7R/-u5D  
  CString m_Number; P057]cAat<  
  //}}AFX_DATA '5A&c(  
  // ClassWizard generated virtual function overrides _bv9/#tR  
  //{{AFX_VIRTUAL(CCaptureDlg) sp_19u  
 public: !Q}Bz*Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3ly ]DTbz  
 protected: >u|4490<0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %WqUZ+yy  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); vrh2}biCR  
  //}}AFX_VIRTUAL U.=TjCW  
  // Implementation K_;?Sr=  
 protected: I9nm$,i]7  
  HICON m_hIcon; \K lY8\c[  
  // Generated message map functions ^rGuyW#  
  //{{AFX_MSG(CCaptureDlg) ]; eJ'#  
  virtual BOOL OnInitDialog(); d" a\`#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 9)n3f^,Oj*  
  afx_msg void OnPaint(); QVmJ_WT  
  afx_msg HCURSOR OnQueryDragIcon(); dIA1\;@  
  virtual void OnCancel(); [(vV45(E  
  afx_msg void OnAbout(); IK8" 3+(  
  afx_msg void OnBrowse(); cnDF`7xrT  
  afx_msg void OnChange(); 31F^38  
 //}}AFX_MSG g>a% gVly  
 DECLARE_MESSAGE_MAP() _UbyhBl  
}; ACI.{`SrQ=  
#endif %][zn$aa|  
\ >#y*W<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Z4{N|h?  
#include "stdafx.h" T:!H^  
#include "Capture.h" sdKm@p|/|  
#include "CaptureDlg.h" [vnxp/v/<  
#include <windowsx.h> |-%dN }O  
#pragma comment(lib,"hook.lib") yb\!4ml  
#ifdef _DEBUG II\}84U2 .  
#define new DEBUG_NEW ?9T,sX:  
#undef THIS_FILE R[#B|$  
static char THIS_FILE[] = __FILE__; R$">  
#endif KB{/L5  
#define IDM_SHELL WM_USER+1 A>)W6|m|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oJc7a z  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ++!0r['+ >  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; sD6vHX%  
class CAboutDlg : public CDialog }kJ9< h,  
{ #9A*BbY  
 public: Qe]&  
  CAboutDlg(); Q.V+s   
  // Dialog Data l\u5RMS('  
  //{{AFX_DATA(CAboutDlg) 3'7X[{uBr  
  enum { IDD = IDD_ABOUTBOX }; n0uL^{B  
  //}}AFX_DATA VT;cz6"6b4  
  // ClassWizard generated virtual function overrides _z#S8Y  
  //{{AFX_VIRTUAL(CAboutDlg) mhNgXp)_56  
 protected: y#nyH0U  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Nig)!4CG  
  //}}AFX_VIRTUAL < [17&F0  
  // Implementation !3"Hn  
 protected: dAaxbP|  
  //{{AFX_MSG(CAboutDlg) uK[gI6M  
  //}}AFX_MSG JaN53,&<  
  DECLARE_MESSAGE_MAP() 7+$P6[*  
}; n]K{-C;  
"&\]1A}Z-x  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {!pYQ|#  
{ x139Ckn  
 //{{AFX_DATA_INIT(CAboutDlg) #BIY[{!  
 //}}AFX_DATA_INIT NRs%q}lX  
} SPINV.  
cdg &)  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b\xse2#  
{ b^<7@tY  
 CDialog::DoDataExchange(pDX); J& D0,cuk  
 //{{AFX_DATA_MAP(CAboutDlg) Wf&i{3z[  
 //}}AFX_DATA_MAP 8>:u%+ C1c  
} Enhrkk  
O5JG!bGE_F  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) q=k[]vD  
 //{{AFX_MSG_MAP(CAboutDlg) zH *7!)8  
 // No message handlers *{=q:E$  
 //}}AFX_MSG_MAP F&OcI.OTXF  
END_MESSAGE_MAP() 6h&i<->  
De49!{\a  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) FuP~_ E~  
: CDialog(CCaptureDlg::IDD, pParent) djDE0-QxcR  
{ g7K<"Z {M  
 //{{AFX_DATA_INIT(CCaptureDlg) Jx8DVjy  
  m_bControl = FALSE; *#B"%;Ln  
  m_bAlt = FALSE; V|;os  
  m_bShift = FALSE; UJ&gm_M+kL  
  m_Path = _T("c:\\"); %vU*4mH  
  m_Number = _T("0 picture captured."); 3`ze<K((  
  nCount=0; l R^W*w4y  
  bRegistered=FALSE; zzX9Q:  
  bTray=FALSE; @Z@S;RWSU  
 //}}AFX_DATA_INIT #/WjKr n  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 V&d?4i4/Q  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =CL h<&  
} #3-hE  
C+-sf  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) q94*2@KV  
{ 2VkA!o4nP  
 CDialog::DoDataExchange(pDX); K$-|7tJon  
 //{{AFX_DATA_MAP(CCaptureDlg) 22D,,nC0+=  
  DDX_Control(pDX, IDC_KEY, m_Key); .U,>Qn4/  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); eie u|_  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3\5I4#S  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); }ct*<zj[~u  
  DDX_Text(pDX, IDC_PATH, m_Path); XKbTj R  
  DDX_Text(pDX, IDC_NUMBER, m_Number); S@C"tHD  
 //}}AFX_DATA_MAP <##aD3)  
} w6[$vib'  
o q cu<]  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?$4CgN-  
//{{AFX_MSG_MAP(CCaptureDlg) \6,Z<.I  
 ON_WM_SYSCOMMAND() ypY7uYO^"  
 ON_WM_PAINT() %? z;'Y7D  
 ON_WM_QUERYDRAGICON() w6'8L s  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) oRl@AhS  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kk/vgte-)e  
 ON_BN_CLICKED(ID_CHANGE, OnChange) cqb]LC  
//}}AFX_MSG_MAP z9^_5la#  
END_MESSAGE_MAP() 2Zi&=Zj"  
[Mlmn$it  
BOOL CCaptureDlg::OnInitDialog() )h;zH,DA[3  
{ p;{w0uld"  
 CDialog::OnInitDialog(); P/8z  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); SSr2K  
 ASSERT(IDM_ABOUTBOX < 0xF000); 15!b]':  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `wNJ*`  
 if (pSysMenu != NULL) i$4lBy_2  
 { q<A,S8'm  
  CString strAboutMenu; 1)!]zV  
  strAboutMenu.LoadString(IDS_ABOUTBOX); GoG_4:^#h  
  if (!strAboutMenu.IsEmpty()) $I90KQB\_  
  { A|P `\_  
   pSysMenu->AppendMenu(MF_SEPARATOR); b'4r5@GO  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Td![Id  
  } 20mZ{_%  
 } jp-]];:aPJ  
 SetIcon(m_hIcon, TRUE); // Set big icon J i:0J},m  
 SetIcon(m_hIcon, FALSE); // Set small icon }/Y)^  
 m_Key.SetCurSel(0); 8?k.4{?  
 RegisterHotkey(); B4;P)\ 2  
 CMenu* pMenu=GetSystemMenu(FALSE); 5>M@ F0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); < nyk:E  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); OY(znVHU  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); K.\-  
 return TRUE; // return TRUE unless you set the focus to a control -!ERe@k(  
} SP5t=#M6  
u5dyhx7  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \E EU G^T  
{ ~8G cWy6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ~sc@49p  
 { |n.ydyu`  
  CAboutDlg dlgAbout; | b)N;t  
  dlgAbout.DoModal(); O; <YLS^|6  
 } ,5Tw5<S  
 else $a+)v#?,  
 { 58_aI?~>>  
  CDialog::OnSysCommand(nID, lParam); j_~lc,+m  
 } Cl3hpqv1I  
} c)=UX_S!  
[KwwhI@3  
void CCaptureDlg::OnPaint() QjwCY=PK!  
{ {m<!-B95  
 if (IsIconic()) G3t 4$3|  
 { 0B~Q.tyP  
  CPaintDC dc(this); // device context for painting @7<m.?A!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >eaK@u-'0  
  // Center icon in client rectangle JZrUl^8E  
  int cxIcon = GetSystemMetrics(SM_CXICON); v4wXa:CJ  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~b{j`T  
  CRect rect; u+uu?.bM  
  GetClientRect(&rect); auQfWO[ u  
  int x = (rect.Width() - cxIcon + 1) / 2; vW4N[ .+  
  int y = (rect.Height() - cyIcon + 1) / 2; \Rvsy;7  
  // Draw the icon Bn{0-5nj  
  dc.DrawIcon(x, y, m_hIcon); ?GKm_b]JC  
 } L\UM12  
 else <x2 F5$@  
 { gb/M@6/j  
  CDialog::OnPaint(); ]j?Kn$nv*S  
 } JSm3ZP|GqJ  
} k~b8=$  
QYTwGThWR  
HCURSOR CCaptureDlg::OnQueryDragIcon() U9p^?\-=  
{ _ a,XL<9I  
 return (HCURSOR) m_hIcon; >~^##bIb  
} W4(O2RU  
[u2)kH$  
void CCaptureDlg::OnCancel() {01wW1  
{ Nm/Fc   
 if(bTray) ?YbZVoD)J  
  DeleteIcon(); *npe]cC  
  CDialog::OnCancel(); A?8 29<  
} XD\Z$\UJE  
CDM==Xa*  
void CCaptureDlg::OnAbout() \M`fkR,,'  
{ @3b|jJyf  
 CAboutDlg dlg; ,W/D0  
 dlg.DoModal(); >xE{& ):  
} /1q] D8  
mD p|EXN  
void CCaptureDlg::OnBrowse() Z;JZ<vEt92  
{ 9#@CmiIhy  
 CString str; vXM``|  
 BROWSEINFO bi; 3M&75OE  
 char name[MAX_PATH]; 4';tMiz  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >, }m=X8  
 bi.hwndOwner=GetSafeHwnd(); K06/ D!RD4  
 bi.pszDisplayName=name; yw;!KUKb|  
 bi.lpszTitle="Select folder"; ".SQ*'Oc  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 6Pa jBEF  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); QP e}rQnm  
 if(idl==NULL) S[ ,r .+  
  return; C&'Y@GE5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); LvNk:99:<  
 str.ReleaseBuffer();  VgNt  
 m_Path=str; [2,u:0"  
 if(str.GetAt(str.GetLength()-1)!='\\') jP";ll|c  
  m_Path+="\\"; XDJQO /qN  
 UpdateData(FALSE); qlg~W/  
} {9 Op{bZ  
:I}_  
void CCaptureDlg::SaveBmp() f 6P5J|'  
{ n[/|M  
 CDC dc; %j=,c{`Q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7>m#Y'ppl@  
 CBitmap bm; 9bT,=b;  
 int Width=GetSystemMetrics(SM_CXSCREEN); U)p P^:|  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?Y~>H 2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "zO+!h'o  
 CDC tdc; i4"xvL K4  
 tdc.CreateCompatibleDC(&dc); FB PT@`~v  
 CBitmap*pOld=tdc.SelectObject(&bm); a|\_'#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~>)GW  
 tdc.SelectObject(pOld);  iV71t17  
 BITMAP btm; G?/1 F1  
 bm.GetBitmap(&btm); VMW ?[j  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7c6-S@L  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }r /L 9  
 BITMAPINFOHEADER bih; T8FKa4ikn  
 bih.biBitCount=btm.bmBitsPixel; 'vTD7a^  
 bih.biClrImportant=0; gGU3e(!Uc  
 bih.biClrUsed=0; EQ>bwEG  
 bih.biCompression=0; W3K"5E0ck  
 bih.biHeight=btm.bmHeight; T+2I:W%  
 bih.biPlanes=1; o=_4v ^  
 bih.biSize=sizeof(BITMAPINFOHEADER); 9=I(AYG{m  
 bih.biSizeImage=size; <96ih$5D1  
 bih.biWidth=btm.bmWidth; l(zkMR$b8  
 bih.biXPelsPerMeter=0; hk&p+NV!  
 bih.biYPelsPerMeter=0; 6|LDb"Rvy  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zq]V6.]J  
 static int filecount=0; b\?#O}  
 CString name; 3<msiC P  
 name.Format("pict%04d.bmp",filecount++); i\rI j0+  
 name=m_Path+name; @Cm"lv.hz  
 BITMAPFILEHEADER bfh; 9#6ilF:F  
 bfh.bfReserved1=bfh.bfReserved2=0; vVLR9"rHM  
 bfh.bfType=((WORD)('M'<< 8)|'B'); mI in'M  
 bfh.bfSize=54+size; s$:]$&5  
 bfh.bfOffBits=54; W9V%Xc`LQ  
 CFile bf; rsP-?oD8)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2#1FI0,Pa*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $X~=M_ W  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =W !m`  
  bf.WriteHuge(lpData,size); lLtC9:  
  bf.Close(); ^O\tN\g;c  
  nCount++; aM.l+D P  
 } foE2rV/Y  
 GlobalFreePtr(lpData); :yk Z7X&  
 if(nCount==1) sS(^7GARa  
  m_Number.Format("%d picture captured.",nCount); =GM!M@~,Ab  
 else HA"dw2 |  
  m_Number.Format("%d pictures captured.",nCount); ~rY<y%K  
  UpdateData(FALSE); L +.K}w  
} G68N@g  
h/(9AO}t  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 3[aJ=5  
{ i$:CGUb  
 if(pMsg -> message == WM_KEYDOWN) x_Ais&Gc  
 { Punbw\9!d,  
  if(pMsg -> wParam == VK_ESCAPE) PD/JXExK  
   return TRUE; fBd +gT\S  
  if(pMsg -> wParam == VK_RETURN) TJsT .DWW~  
   return TRUE; 9f,HjRP  
 } E4y"$U%.  
 return CDialog::PreTranslateMessage(pMsg); ! 2Y, a  
} l/rhA6kEU  
gYzKUX@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9fl !CG  
{ {Y'_QW1:2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ J;q3 fa  
  SaveBmp(); ]P<&CEk  
  return FALSE; /e{Oqhf[n  
} ( v ~/glf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Z^GriL  
 CMenu pop; A7b7IM[  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )cs y^-qw  
 CMenu*pMenu=pop.GetSubMenu(0); QTn-n)AE  
 pMenu->SetDefaultItem(ID_EXITICON); KI>7h.t  
 CPoint pt; sCRBKCR?  
 GetCursorPos(&pt); <U,T*Ql1x  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); s^KxAw_IV  
 if(id==ID_EXITICON) |+`hSA  
  DeleteIcon(); W+K=M*^D;c  
 else if(id==ID_EXIT) &*)tqQeQf  
  OnCancel(); BTd'bD~EA  
 return FALSE; LK:|~UV?  
} 6gR=e+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bh7 1Zu  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) & vLX  
 AddIcon(); 3?5 ~KxOE(  
 return res; (J^ Tss  
} &_90E  
>2g CM  
void CCaptureDlg::AddIcon() ? ! 1uw  
{ F~l3?3ZV  
 NOTIFYICONDATA data; ?ST}0F00}  
 data.cbSize=sizeof(NOTIFYICONDATA); [#R%jLEJ2  
 CString tip; :sPku<1is  
 tip.LoadString(IDS_ICONTIP); 8v]{ 5  
 data.hIcon=GetIcon(0); TyBNRnkt  
 data.hWnd=GetSafeHwnd(); 2Vu|uZd  
 strcpy(data.szTip,tip); ]7u8m[@  
 data.uCallbackMessage=IDM_SHELL; .ySesN: C~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Bgs~1E@8V  
 data.uID=98; 3.dUMJ$_  
 Shell_NotifyIcon(NIM_ADD,&data); jZ{S{"j  
 ShowWindow(SW_HIDE); aF;&#TsB  
 bTray=TRUE; l5h9Eq  
} J<`RlDI  
2bxT%xH:g  
void CCaptureDlg::DeleteIcon() xwRnrWd^6  
{ M"9 zK[cz  
 NOTIFYICONDATA data; G8;S`-D1a,  
 data.cbSize=sizeof(NOTIFYICONDATA); rf`Br\g8  
 data.hWnd=GetSafeHwnd(); nL:vRJr-$  
 data.uID=98; 4 ^+hw;  
 Shell_NotifyIcon(NIM_DELETE,&data); ASYUKh,h  
 ShowWindow(SW_SHOW); vSnb>z1  
 SetForegroundWindow(); %cm5Z^B1"  
 ShowWindow(SW_SHOWNORMAL); a<Ns C1  
 bTray=FALSE; FQ-(#[  
} ]nQ$:%HP  
c~tSt.^WX  
void CCaptureDlg::OnChange() _N-7H\hF  
{ v;RQVH;,  
 RegisterHotkey(); Kq S2  
} h ?ia4t  
+I Ze`M%n  
BOOL CCaptureDlg::RegisterHotkey() -y\N9  
{ [y{ag{  
 UpdateData(); Bs1-UI}+  
 UCHAR mask=0; =)zq %d?i;  
 UCHAR key=0; _+Q$h4t   
 if(m_bControl) Asn0&Ys4  
  mask|=4; Gqia@>T4*N  
 if(m_bAlt) W?l .QQk  
  mask|=2; vfbe=)}[  
 if(m_bShift) K4F!?#  
  mask|=1; ~lF lv+,%  
  key=Key_Table[m_Key.GetCurSel()]; & 9]KkY=  
 if(bRegistered){ *g,?13Q_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ZK ?x_`w  
  bRegistered=FALSE;  R_N<j  
 } LNN:GD)>  
 cMask=mask; f C^l9CRY  
 cKey=key; pS<b|wu?f  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); NF1D8uI  
 return bRegistered; GVfu_z?  
} - dOT/%Ux  
L$Leo6<3a  
  四、小结 z\E "={P&  
\=@r1[d  
  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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