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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: "D.<~!  
  ZMgsuzg  
  一、实现方法 yR>P  
1(BLdP3&  
  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]vB\5uA:  
K{DC{yLu  
#pragma data_seg("shareddata") N=1ue`i  
HHOOK hHook =NULL; //钩子句柄 ZEI)U, I.  
UINT nHookCount =0; //挂接的程序数目 ~@c<5 -`{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (7G4v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 E42)93~C  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rt*x[5<  
static int KeyCount =0; <WIIurp  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 b:F;6X0~Hl  
#pragma data_seg() PEvY3F}_rh  
+S4>}2N33  
  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。 tI{]&dev  
Uyb0iQ-,s  
  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: iZn0B5]ikj  
O^~IY/[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR L3Y,z3/  
cKey,UCHAR cMask) ;9z|rWsF  
{ 3XQa%|N(  
 BOOL bAdded=FALSE; b V  EJ  
 for(int index=0;index<MAX_KEY;index++){ =_-u;w1D  
  if(hCallWnd[index]==0){ 2QaE&8vW  
   hCallWnd[index]=hWnd; bp9RF d{  
   HotKey[index]=cKey; >p-UQc  
   HotKeyMask[index]=cMask;  6a,8t  
   bAdded=TRUE; o664b$5nsI  
   KeyCount++; :%sBY0 yF  
   break; gf8o~vKX$G  
  } %evb.h)  
 } aNu.4c/5  
 return bAdded; \09A"fs{  
} fVn4=d6X  
//删除热键 G"F O%3&|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7e+C5W*9b  
{ 0}<blU  
 BOOL bRemoved=FALSE; Yt#; +*d5  
 for(int index=0;index<MAX_KEY;index++){ aDRcVA$*  
  if(hCallWnd[index]==hWnd){ x[{\Aw>$.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V_~lME  
    hCallWnd[index]=NULL; &q<k0_5Q  
    HotKey[index]=0; Nksm&{=6S  
    HotKeyMask[index]=0; ]6Iu\,#J  
    bRemoved=TRUE; >} 2C,8N  
    KeyCount--; ys=} V|  
    break; bfA>kn0C  
   } Qg/FFn^Kg*  
  } l0,VN,$Yl  
 } Am*IC?@tq  
 return bRemoved; B%\&Q @X  
} htbE Q NW  
I;'{X_9$a  
tR>zBh_b  
  DLL中的钩子函数如下: i24k ]F  
u1X^#K$nu'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X\;:aRDS  
{ Im~DK  
 BOOL bProcessed=FALSE; r gIWM"  
 if(HC_ACTION==nCode) 9 ~W]D!m,  
 { +45SKu=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 _$AM=?P &  
   switch(wParam) q{&c?l*2  
   {  A*DN/lG  
    case VK_MENU: D-{*3?x  
     MaskBits&=~ALTBIT; gPCf+>X{  
     break; 4ekwmw(ox  
    case VK_CONTROL: Cl&mz1Y;]1  
     MaskBits&=~CTRLBIT; ZJ%NZAxy  
     break; ppz3"5  
    case VK_SHIFT: %l!A%fn(  
     MaskBits&=~SHIFTBIT; imif[n+]}d  
     break; /HRKw D  
    default: //judge the key and send message =?C <@  
     break; k( 0;>)<i  
   } nRBS&&V  
   for(int index=0;index<MAX_KEY;index++){ Q8`V0E\~  
    if(hCallWnd[index]==NULL) 7vZO;FGtG  
     continue; F6sQeU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y\_+,G0  
    { FcM)v"bF&]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1?&|V1vc  
     bProcessed=TRUE; eXKEx4rU  
    } ;&=jSgr8  
   } SN@>mpcJS  
  } -OJ<Lf+"=  
  else if((lParam&0xc000ffff)==1){ //有键按下 &fB=&jc*j  
   switch(wParam) GPLop/6   
   { ~B{08%|oK  
    case VK_MENU: 8D)1ZUx7`  
     MaskBits|=ALTBIT; 2J t{oh|  
     break; ;l!<A  
    case VK_CONTROL: 3=n6N TL  
     MaskBits|=CTRLBIT; V$hL\`e  
     break; iHNQxLkk{:  
    case VK_SHIFT: cVx SO`jZw  
     MaskBits|=SHIFTBIT; fCUx93,>z  
     break; AwG0E `SU  
    default: //judge the key and send message )dfhy  
     break; ]^"Lc~w8&  
   } }Ecv6&G  
   for(int index=0;index<MAX_KEY;index++){ |*t2IVwX  
    if(hCallWnd[index]==NULL) f@;pN=PS  
     continue; g "Du]_,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RI8*'~ix]  
    { VLm\PS   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); yJ!26  
     bProcessed=TRUE; ~4+Y BN  
    } 'sI ne>  
   } O W.CU=XU  
  } w98M #GqV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 GAY?F  
   for(int index=0;index<MAX_KEY;index++){ 1_{e*=/y  
    if(hCallWnd[index]==NULL) }i^M<A O  
     continue; *~P| ? D'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -}<Ru)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); !k% PP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 o}r_+\n  
   } +#wVe  
  } ?n{m2.H  
 } "=DQ {(L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); WwsNAJ  
} 1f+A_k/@  
;O)*!yA(GG  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: e^ N~)Nlj  
kAp#6->(q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v CsE|eMP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JfkEJk<  
!B Pm{_C  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: :2xGfy??  
O$,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X[h{g`  
{ })] iN "  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) TY% c`Q5  
 { g8E5"jpXx3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \LJ!X3TZ  
  SaveBmp(); @#hQ0F8  
  return FALSE; ~.x#ic  
 } `scW.Vem  
 …… //其它处理及默认处理 F-ZTy"z  
} 5)Z=FUupA~  
! xM=7Q k  
4J[zNB]  
  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。 I*%3E.Z@g  
7ucm1   
  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。 Mhn1-ma:  
9~=zD9,|iA  
  二、编程步骤 %0y-f  
u:J( 0re  
  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"htWo{v>  
5yt=~  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; i Ehc<  
[ p,]/ ^ N  
  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; 'V%w{ZiiV  
#tg\ bb  
  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; OMk3\FV2Z  
^|oI^"I Q=  
  5、 添加代码,编译运行程序。 afHRy:<+%  
bK}ZR*)  
三、程序代码 }ACg#;>/+  
FWeUZI+  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ~m<K5K6 V  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (t3gNin  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ DXD+,y\=  
#if _MSC_VER > 1000 ,? <;zq  
#pragma once r{?qvl!q  
#endif // _MSC_VER > 1000 .0yBI=QI  
#ifndef __AFXWIN_H__ *\#<2 QAe  
#error include 'stdafx.h' before including this file for PCH "uuM#@h  
#endif U*{0,Ue'  
#include "resource.h" // main symbols W2-l_{  
class CHookApp : public CWinApp A?04,l]y  
{ v(Kj6'  
 public: - s'W^(  
  CHookApp(); Q'jGNWep  
  // Overrides f9UDH8X  
  // ClassWizard generated virtual function overrides Efe(tH2q  
  //{{AFX_VIRTUAL(CHookApp) H ABUf^~-  
 public: -ewR:Y@j  
  virtual BOOL InitInstance(); ]6^S: K_"  
  virtual int ExitInstance(); 4xT /8>v2|  
  //}}AFX_VIRTUAL XBX`L"0  
  //{{AFX_MSG(CHookApp) ?99r>01>  
  // NOTE - the ClassWizard will add and remove member functions here. [bKc5qp  
  // DO NOT EDIT what you see in these blocks of generated code ! @?J7=}bzz  
  //}}AFX_MSG dY. X/f  
  DECLARE_MESSAGE_MAP() eN5F@isy  
}; ?A\+s,9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); bbS,pid1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ys_L GfK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o1\N)%  
BOOL InitHotkey(); xX<T5Ls  
BOOL UnInit(); ;uc3_J]  
#endif Muq~p~m}  
?{ \7th37  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. id+EBVHAd  
#include "stdafx.h" :I /9j=@1  
#include "hook.h" \kKd:C{  
#include <windowsx.h> ?`Mk$Y%my  
#ifdef _DEBUG 6&<QjO  
#define new DEBUG_NEW Ok)f5")N %  
#undef THIS_FILE z@ZI$.w  
static char THIS_FILE[] = __FILE__; J"h2"$v,  
#endif 7g Ou|t  
#define MAX_KEY 100 1Hhr6T^)  
#define CTRLBIT 0x04 uj\&-9gEi  
#define ALTBIT 0x02 4VvE(f  
#define SHIFTBIT 0x01 Y5ei:r|^  
#pragma data_seg("shareddata") 4gEw }WiP  
HHOOK hHook =NULL; hFtjw6  
UINT nHookCount =0; n|T$3j)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey n>B ,O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ?Qd`Vlp7  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d14@G4#Bd  
static int KeyCount =0; !S7?:MJ?p\  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z$c&Y>@)  
#pragma data_seg() *C|*{!  
HINSTANCE hins; 90F.9rh  
void VerifyWindow(); /Dc54U n  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?HOnDw.v1  
//{{AFX_MSG_MAP(CHookApp) U7/ =| Z  
// NOTE - the ClassWizard will add and remove mapping macros here. SR.xI:}4  
// DO NOT EDIT what you see in these blocks of generated code! Nf* .r  
//}}AFX_MSG_MAP D|$0~1y  
END_MESSAGE_MAP() ;H8`^;  
K&{ _s  
CHookApp::CHookApp() Lwm /[  
{ "ivVIq2  
 // TODO: add construction code here, j p}.W  
 // Place all significant initialization in InitInstance BINHCZ  
} =^Ws/k  
FmF[S&gFRs  
CHookApp theApp; uF3{FYM{I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Exv!!0Cd^  
{ iu{;|E  
 BOOL bProcessed=FALSE; VR_/Vh ]@  
 if(HC_ACTION==nCode) AK'3N1l`  
 { m=COF$<  
  if((lParam&0xc0000000)==0xc0000000){// Key up F#Pn]  
   switch(wParam) ">8oF.A^  
   { Je"XIhBr  
    case VK_MENU: :qR8 e J  
     MaskBits&=~ALTBIT; N|"q6M !ZL  
     break; |FaK =e  
    case VK_CONTROL: j5n"LC+oz  
     MaskBits&=~CTRLBIT; s)3CosU  
     break; o ,_F;ZhE  
    case VK_SHIFT: `B8`<3k/(  
     MaskBits&=~SHIFTBIT; <jFov`^  
     break; ZF#lh]  
    default: //judge the key and send message .*595SuF  
     break; \%}]wf}  
   } Kx[+$Qt  
   for(int index=0;index<MAX_KEY;index++){ )B-[Q#*A-  
    if(hCallWnd[index]==NULL) #@V<{/;49  
     continue; e50xcf1u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8eh3K8tL#  
    { yO\bVu5V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tNqSCjQ~_c  
     bProcessed=TRUE; J.g6<n  
    } x6\VIP"9L  
   } i(e=  
  } 4 u0?[v[Hu  
  else if((lParam&0xc000ffff)==1){ //Key down jC>mDnX  
   switch(wParam) j~+(#|  
   {  N`X|z  
    case VK_MENU: ^xgPL'  
     MaskBits|=ALTBIT; BlT)hG(M>  
     break; &01KHJY)/G  
    case VK_CONTROL: (<Cg|*s  
     MaskBits|=CTRLBIT; 7FaF]G  
     break; })PU`?f  
    case VK_SHIFT: lFA-T I&  
     MaskBits|=SHIFTBIT; BGH'&t_5  
     break; j g EYlZ  
    default: //judge the key and send message NYxL7:9  
     break; 8U]mr+  
   } 09Q5gal  
   for(int index=0;index<MAX_KEY;index++) "~Kph0-  
   { >wYmx4W>  
    if(hCallWnd[index]==NULL) UT 7'-  
     continue; V=>]&95-f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?%Q=l;W.  
    { s nNd7v.U6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l8%BRG  
     bProcessed=TRUE;  0,#n_"  
    } \SgBI/L^  
   } BP&] t1p  
  } \7o7~pll  
  if(!bProcessed){ 3F6A.Ny  
   for(int index=0;index<MAX_KEY;index++){ d[H`Fe6h  
    if(hCallWnd[index]==NULL) RA+M.  
     continue; X}QcXc.d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [oXr6M:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @L607[!?  
   } 8{&.[S C7  
  } %l%2 hvGZ  
 } ?d3<GhzlR3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CNWA!1n^Hy  
} i}|jHlv  
@o<B>$tbu4  
BOOL InitHotkey() o=lZl_5/u;  
{ v}!^RW 'X  
 if(hHook!=NULL){ +n &8" )  
  nHookCount++; F,mStw:  
  return TRUE; |1(L~g  
 } >B$ IrM7J  
 else lEQj62zIQ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); iK5[P  
  if(hHook!=NULL) Oq}7q!H  
   nHookCount++; vMJ_n=Vf  
  return (hHook!=NULL); GbkDs-  
} Vhn Ir#L+  
BOOL UnInit() {?cF2K#  
{ (II#9 n)  
 if(nHookCount>1){ Z;dR :|%)  
  nHookCount--; (enOj0  
  return TRUE; %bG\  
 } ']^]z".H  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ?ZhBS3L  
 if(unhooked==TRUE){ TOvsW<cM  
  nHookCount=0; `Xi)';p  
  hHook=NULL; 9m"EY@-  
 } %_39Wa  
 return unhooked; ':=20V  
} M,r8 No  
g\49[U}[~F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tp\d:4~R  
{ >@-BZJg/k  
 BOOL bAdded=FALSE; ]% G#x  
 for(int index=0;index<MAX_KEY;index++){ }_+):<Db  
  if(hCallWnd[index]==0){ cw_B^f8^  
   hCallWnd[index]=hWnd; j97K\]tQ  
   HotKey[index]=cKey; GJF ,w{J  
   HotKeyMask[index]=cMask; je>mAQKi\  
   bAdded=TRUE; Q} -YD.bx3  
   KeyCount++; $>wN:uN(  
   break; "SC]G22  
  } 16~5;u  
 } @cG+ D  
 return bAdded; aCfWbJ@qiG  
} 4dI`  
}JUc!cH8z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  \5HVX/  
{ A#F6~QX(.9  
 BOOL bRemoved=FALSE; ZV-Yq !|t  
 for(int index=0;index<MAX_KEY;index++){ qzu(4*Gk6  
  if(hCallWnd[index]==hWnd){ sei%QE]!/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ )[E7\pc  
    hCallWnd[index]=NULL; |g<l|lqz|  
    HotKey[index]=0; GIS,EwA  
    HotKeyMask[index]=0; #1'p?%K.  
    bRemoved=TRUE; 1CUI6@Cz)  
    KeyCount--; AG G xx?I  
    break; 8xoC9!xt  
   } y XCZs  
  } w)>/fG|;  
 } LS<*5 HWX  
 return bRemoved; u*T#? W?  
} q9Lq+4\  
V#~.n ;d  
void VerifyWindow() &i *e&{L7  
{ B\~(:(OPM]  
 for(int i=0;i<MAX_KEY;i++){  Q 6r  
  if(hCallWnd!=NULL){ 7v`~;}5  
   if(!IsWindow(hCallWnd)){ - G=doP0  
    hCallWnd=NULL; 7Ewq'Vu`y  
    HotKey=0; Jg6@)<n  
    HotKeyMask=0; ;"NW= P&  
    KeyCount--; J(,{ -d-E  
   } a0`(* #P  
  } "~08<+  
 } c$;Cpt@-j  
} byk9"QeY\  
{@t6[g++  
BOOL CHookApp::InitInstance() '*K%\]  
{ CI|#,^  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @3?dI@i(  
 hins=AfxGetInstanceHandle(); =vb'T  
 InitHotkey(); OXV9D:bIa  
 return CWinApp::InitInstance(); G~f|Sx  
} 22EI`}"J  
b C"rQJg  
int CHookApp::ExitInstance() k !g%vx  
{ ca'c5*Fs  
 VerifyWindow(); o"qG'\x  
 UnInit(); aBKJd  
 return CWinApp::ExitInstance(); lQVK~8t3  
} 75c\.=G9q<  
TTSq}sb}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =BeJ.8$@VC  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6PLdzZ{  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6+SaO !lR  
#if _MSC_VER > 1000 g:&PjKA  
#pragma once Gr~J-#a3~D  
#endif // _MSC_VER > 1000 n?v$C:jLN  
}Gd^r  
class CCaptureDlg : public CDialog PWS5s^WM  
{ Aj"fkY|Q  
 // Construction lt{"N'Gw6  
 public: S\@U3|Q5  
  BOOL bTray; y6>fK@K~  
  BOOL bRegistered; ~@D{&7@  
  BOOL RegisterHotkey(); iMF-TR  
  UCHAR cKey; 41i#w;ojI  
  UCHAR cMask; z[]8"C=  
  void DeleteIcon(); 3o_@3-Y%  
  void AddIcon(); [h0)V(1KR  
  UINT nCount; i(S}gH4*o  
  void SaveBmp(); |1m2h]];Q  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor \*30E<;C_  
  // Dialog Data stq%Eg?  
  //{{AFX_DATA(CCaptureDlg) lkQ(?7  
  enum { IDD = IDD_CAPTURE_DIALOG }; >oyZD^gj  
  CComboBox m_Key; PC& (1kJ  
  BOOL m_bControl; &hIr@Gi@ch  
  BOOL m_bAlt; -8sB\E  
  BOOL m_bShift; gzp]hh@4  
  CString m_Path; Yi|Nd;  
  CString m_Number; P2 z~U  
  //}}AFX_DATA `M ~-(,++  
  // ClassWizard generated virtual function overrides |p*s:*TJp  
  //{{AFX_VIRTUAL(CCaptureDlg) X>eFGCz}I  
 public: 0G8zFe*p  
  virtual BOOL PreTranslateMessage(MSG* pMsg); H|<Zm:.%$  
 protected: bqQR";  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >8gb/?z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q\z9\mMG-  
  //}}AFX_VIRTUAL F?4&qbdD  
  // Implementation i5czm?x  
 protected: UQJ  
  HICON m_hIcon; 3moDu  
  // Generated message map functions wU&vkb)k  
  //{{AFX_MSG(CCaptureDlg) Gi,4PD-ro  
  virtual BOOL OnInitDialog(); DxG8`}+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Y".4."NX  
  afx_msg void OnPaint(); :a)`iJnb  
  afx_msg HCURSOR OnQueryDragIcon(); W9jxw4)  
  virtual void OnCancel(); k1HCPj  
  afx_msg void OnAbout(); ,UW!?}@  
  afx_msg void OnBrowse(); |G P1[Q{  
  afx_msg void OnChange(); #M[%JTTn  
 //}}AFX_MSG }i9VV+L#1  
 DECLARE_MESSAGE_MAP() G]gc*\4  
}; 5:SS2>~g  
#endif p u[S  
ZY8:7Q@P>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o=C'u  
#include "stdafx.h" 4u7^v1/  
#include "Capture.h" h:<?)g~U  
#include "CaptureDlg.h" --F6n/>  
#include <windowsx.h> {A{sRT=%  
#pragma comment(lib,"hook.lib") N"zm  
#ifdef _DEBUG \mNN ) K@  
#define new DEBUG_NEW Vv*](iM  
#undef THIS_FILE Gg5+Ap D  
static char THIS_FILE[] = __FILE__; > |(L3UA9  
#endif 'E4}++\  
#define IDM_SHELL WM_USER+1 X 3(*bj>P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N$P\$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); otdm r w|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; />V& OX `  
class CAboutDlg : public CDialog i: VMC NH  
{ IkgRZ{Y  
 public: x\K,@  
  CAboutDlg(); |6b&khAM  
  // Dialog Data Ko %e#q-  
  //{{AFX_DATA(CAboutDlg) Si-Q'*Y=  
  enum { IDD = IDD_ABOUTBOX }; fmv,)UP  
  //}}AFX_DATA =8Gpov1!V~  
  // ClassWizard generated virtual function overrides c6MMI]+8  
  //{{AFX_VIRTUAL(CAboutDlg) '_ FxxLAO  
 protected: r|Q/:UV?w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1krSX 2L  
  //}}AFX_VIRTUAL e}TDo`q  
  // Implementation T}Ve:S  
 protected: Up\ k67  
  //{{AFX_MSG(CAboutDlg) +*x9$LSD  
  //}}AFX_MSG C\}M_MD  
  DECLARE_MESSAGE_MAP() f^G-ba  
}; Er<!8;{?  
*fQn!2}=(  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +RyV"&v  
{ a[NR%Xq  
 //{{AFX_DATA_INIT(CAboutDlg) qzi i[Mf  
 //}}AFX_DATA_INIT 8T3Nz8Q7  
} k;l^y%tzp  
LMI7Ih;  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5GDg_9Bz  
{ 8Bx58$xRq  
 CDialog::DoDataExchange(pDX); b-YmS=*  
 //{{AFX_DATA_MAP(CAboutDlg) > QG@P  
 //}}AFX_DATA_MAP pLtK:Z  
} O-qpB;|  
P5&8^YV`N  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {ukQBu#}<  
 //{{AFX_MSG_MAP(CAboutDlg) !twYjOryH[  
 // No message handlers N;i\.oY  
 //}}AFX_MSG_MAP JHg y&/  
END_MESSAGE_MAP() [rReBgV  
\/R $p  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0t6DD  
: CDialog(CCaptureDlg::IDD, pParent) N@V:nCl  
{ LU+}iA)  
 //{{AFX_DATA_INIT(CCaptureDlg) Q 6dqFnz  
  m_bControl = FALSE; Koc5~qUY]  
  m_bAlt = FALSE; jt3=<&*Bm  
  m_bShift = FALSE; _3q}K  
  m_Path = _T("c:\\"); K<M WiB&  
  m_Number = _T("0 picture captured."); =LKf.@]#  
  nCount=0; >FqU=Q  
  bRegistered=FALSE; T%w5%{dqJ  
  bTray=FALSE; ?b\oM v5y  
 //}}AFX_DATA_INIT Z=(Tq1t  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 qI*7ToBJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); hp}JKj@  
} 0e(4+:0  
+6:jm54  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) i'[! 'HY  
{ :jFZz%   
 CDialog::DoDataExchange(pDX); $0Un'"`S  
 //{{AFX_DATA_MAP(CCaptureDlg) R]4 h)"  
  DDX_Control(pDX, IDC_KEY, m_Key); F[>Y8e<[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); nBwDq^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); f(T`(pX0V  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); eQ<Vky^SJ  
  DDX_Text(pDX, IDC_PATH, m_Path); %<<JWoB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); I/go$@E"  
 //}}AFX_DATA_MAP p;~oIy\,  
} .pIO<ZAFT  
%$67*pY'JH  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +NVXFjPC  
//{{AFX_MSG_MAP(CCaptureDlg) '~zi~Q7M  
 ON_WM_SYSCOMMAND() q2*1Gn9!j  
 ON_WM_PAINT() $J#Z`%B^y  
 ON_WM_QUERYDRAGICON() ,@\z{}~v  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) e<+b?@}=B  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -?NAA]P5c@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \s7/`  
//}}AFX_MSG_MAP 5-UrHbpCZ#  
END_MESSAGE_MAP() kc<5wY_t  
lLLPvW[Q  
BOOL CCaptureDlg::OnInitDialog() WG +]  
{ ~bz$]o-<  
 CDialog::OnInitDialog(); 9K-,#a  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); uo bQS!  
 ASSERT(IDM_ABOUTBOX < 0xF000); vb3hDy  
 CMenu* pSysMenu = GetSystemMenu(FALSE); aI 1tG  
 if (pSysMenu != NULL) FmgMd)#  
 { fpJ%{z2  
  CString strAboutMenu; Xq}}T%jcd  
  strAboutMenu.LoadString(IDS_ABOUTBOX); +3Z+#nGtk  
  if (!strAboutMenu.IsEmpty()) +%Z:k  
  { Y~@(  
   pSysMenu->AppendMenu(MF_SEPARATOR); m;!X{CV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); JA4}B wn  
  } o $'K}U  
 } ?RS4oJz,5g  
 SetIcon(m_hIcon, TRUE); // Set big icon QWE\Ud.q  
 SetIcon(m_hIcon, FALSE); // Set small icon X6xs@tgQ  
 m_Key.SetCurSel(0); $@84nR{>  
 RegisterHotkey(); ll*Ez"  
 CMenu* pMenu=GetSystemMenu(FALSE); m$7C{Mr'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 2a*+mw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); S3&n?\CO:  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); @U9`V&])F[  
 return TRUE; // return TRUE unless you set the focus to a control V!NRBXg  
} 5..YC=_20  
\UZ7_\  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) <r m)c.  
{ z<gII~%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) G!o6Y:1!  
 { wj5,_d)  
  CAboutDlg dlgAbout; 2w fkXS=~6  
  dlgAbout.DoModal(); s\p 1EL(  
 } @U@O#+d'ZR  
 else "Y@q?ey[1  
 { N%%trlDXD  
  CDialog::OnSysCommand(nID, lParam); Ctx>#uN6  
 } 5&xbGEP$  
} ZD4aT1|Q7  
Y*IKPnPot2  
void CCaptureDlg::OnPaint() ,aIkiT  
{ `G%h=rr^c  
 if (IsIconic()) 1DGl[k/zv  
 { Z[>fFg~N4  
  CPaintDC dc(this); // device context for painting 8U}+9  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); I'[;E.KU  
  // Center icon in client rectangle AnK X4Q  
  int cxIcon = GetSystemMetrics(SM_CXICON); ./^8L(  
  int cyIcon = GetSystemMetrics(SM_CYICON); aU_l"+5>vq  
  CRect rect; CeM%?fr5  
  GetClientRect(&rect); 2/\I/QkTs  
  int x = (rect.Width() - cxIcon + 1) / 2; Mi\- 9-  
  int y = (rect.Height() - cyIcon + 1) / 2; q(A_k+NL  
  // Draw the icon }$g"|;<ha  
  dc.DrawIcon(x, y, m_hIcon); l dp$jrNLr  
 } AGKT*l.-  
 else g:@4/+TSt  
 { F>GPi!O  
  CDialog::OnPaint(); e X6o 7a  
 } Q<KF<K'0hg  
} GMB3`&qh  
D1@yW} 4  
HCURSOR CCaptureDlg::OnQueryDragIcon() |<O^M q  
{ F{rC{5@fj  
 return (HCURSOR) m_hIcon; *9aI\#}  
} T#i~/  
<PM.4B@  
void CCaptureDlg::OnCancel() U@D\+T0  
{ Spin]V  
 if(bTray) C ](djkA$  
  DeleteIcon(); pG'?>]Rt4  
  CDialog::OnCancel(); 2EYWX! Bx  
} JSmg6l?[u  
Ql9>i;AGV  
void CCaptureDlg::OnAbout() 1_l)$"  
{ pF9WKpzE  
 CAboutDlg dlg; [j0jAl  
 dlg.DoModal(); PZO.$'L|7  
} #{#k;va  
Ro4!y:2|  
void CCaptureDlg::OnBrowse() e/#6qCE  
{ |WSpWsr,  
 CString str; pred{HEye  
 BROWSEINFO bi; h:sf?X[  
 char name[MAX_PATH]; Db;>MWt+e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); DtJ3`Jd  
 bi.hwndOwner=GetSafeHwnd(); yE(<F2  
 bi.pszDisplayName=name; f2&6NC;  
 bi.lpszTitle="Select folder"; u J]uz%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; GG-b)64h`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [:q J1^UU  
 if(idl==NULL) f6nuh&!-  
  return; UZmo?&y  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d|)ARRW  
 str.ReleaseBuffer(); 9U4[o<G]=  
 m_Path=str; Z9q4W:jyS  
 if(str.GetAt(str.GetLength()-1)!='\\') .mcohfR  
  m_Path+="\\"; S%B56|'  
 UpdateData(FALSE); +XW1,ly~  
} E9Dy)f]#W  
c;!| =  
void CCaptureDlg::SaveBmp() h9!4\{V;h  
{ XsDZ<j%x89  
 CDC dc; Ts3!mjn  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 7oc Ng  
 CBitmap bm; "] Uj _d  
 int Width=GetSystemMetrics(SM_CXSCREEN); hJ8% r_  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2I& dTxIa  
 bm.CreateCompatibleBitmap(&dc,Width,Height); DY{v@ <3  
 CDC tdc; G)c+GoK  
 tdc.CreateCompatibleDC(&dc); 0c1=M|2  
 CBitmap*pOld=tdc.SelectObject(&bm);  R0F [  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .726^2sx  
 tdc.SelectObject(pOld); BwGOn)KL  
 BITMAP btm; J!G92A~*]  
 bm.GetBitmap(&btm); cfRUVe  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^:mKTiA-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %M/L/_d  
 BITMAPINFOHEADER bih; ld):Am}/o  
 bih.biBitCount=btm.bmBitsPixel; EwgNd Gcj  
 bih.biClrImportant=0; Cbl>eKw  
 bih.biClrUsed=0; p GF;,h>  
 bih.biCompression=0; }_}    
 bih.biHeight=btm.bmHeight; bj0<A  
 bih.biPlanes=1; Ciz,1IV  
 bih.biSize=sizeof(BITMAPINFOHEADER); ShvC4Xb 0  
 bih.biSizeImage=size; o|c&$)m  
 bih.biWidth=btm.bmWidth; 5wE6gRJ  
 bih.biXPelsPerMeter=0; nh80"Ny5  
 bih.biYPelsPerMeter=0; O '`|(L  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %++S;#)~  
 static int filecount=0; Da!vGr  
 CString name; q8.Z7ux  
 name.Format("pict%04d.bmp",filecount++); 8 nqF i  
 name=m_Path+name; qJO6m-  
 BITMAPFILEHEADER bfh; -dN`Ok<g  
 bfh.bfReserved1=bfh.bfReserved2=0; ~l. C -  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 59v=\; UI  
 bfh.bfSize=54+size; V pzjh,r-j  
 bfh.bfOffBits=54; YC<FKWc  
 CFile bf; xj&~>&U){;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ cxvO,8NiB  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ="f-I9y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [;4ak)!  
  bf.WriteHuge(lpData,size); I9rQX9#B  
  bf.Close(); +lZ-xU1  
  nCount++; 6#Y]^%?uy  
 } |nr;OM  
 GlobalFreePtr(lpData); 0(9gTxdB  
 if(nCount==1) ~m0=YAlk?  
  m_Number.Format("%d picture captured.",nCount); X56q ,jCJ{  
 else TiZ MY:^  
  m_Number.Format("%d pictures captured.",nCount); Dq9f Fe  
  UpdateData(FALSE); B|+% ExT7  
} (2"4PU8  
gkq~0/  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 4ji'6JHPg  
{ dS \n 2Qb  
 if(pMsg -> message == WM_KEYDOWN)  xB?!nd  
 { !U(KQ:j  
  if(pMsg -> wParam == VK_ESCAPE) s>WqVuXmn  
   return TRUE; .L^;aL  
  if(pMsg -> wParam == VK_RETURN) >yqEXx5{  
   return TRUE; {!{T,_ J  
 } wN6sica|  
 return CDialog::PreTranslateMessage(pMsg); ^YfAsBs&  
} ~ 7Nqwwx  
}g%&}`%'  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @T.F/Pjhc  
{ m9jjKu]|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %?qzP '  
  SaveBmp(); j.+,c#hFo  
  return FALSE; 0TICv2l!  
} L;b-=mF  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $U. 2"  
 CMenu pop; $[J\sokpY  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5"q{b1  
 CMenu*pMenu=pop.GetSubMenu(0); 9jl\H6JY|  
 pMenu->SetDefaultItem(ID_EXITICON); ?o/p}6  
 CPoint pt; oW(8bd)  
 GetCursorPos(&pt); AP=SCq;  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); HBk5 p>&  
 if(id==ID_EXITICON) hKsx7`[  
  DeleteIcon(); X\<a|/{V A  
 else if(id==ID_EXIT) [r'hX#  
  OnCancel(); "[Tr"nI  
 return FALSE; 0{?%"t\/f  
} pMp@W`i^6  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D6e<1W  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Xa&:Hg<  
 AddIcon(); }ASBP:c"t  
 return res; _,-\;  
} "DJ%Yo  
J=n^&y  
void CCaptureDlg::AddIcon() L;KLmxy#  
{ 9@*4^Ks p  
 NOTIFYICONDATA data; -OfAl~ 4  
 data.cbSize=sizeof(NOTIFYICONDATA); UB% ;P-RD  
 CString tip; `WQpGBS_z_  
 tip.LoadString(IDS_ICONTIP); lw4#C`bx  
 data.hIcon=GetIcon(0); FOcDBCrOe  
 data.hWnd=GetSafeHwnd(); ab6D&  
 strcpy(data.szTip,tip); Mq6_Q07  
 data.uCallbackMessage=IDM_SHELL; `]Vn[^?D  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $,T3vX]<  
 data.uID=98; z_z '3d.r7  
 Shell_NotifyIcon(NIM_ADD,&data); a1weTn*  
 ShowWindow(SW_HIDE); _ g"su #  
 bTray=TRUE; D[Ld=e8t  
} zH@+\#M  
[|HQfTp$  
void CCaptureDlg::DeleteIcon() 8}^ym^H|j  
{ |e3YTLsI  
 NOTIFYICONDATA data; RWn#"~  
 data.cbSize=sizeof(NOTIFYICONDATA); MpJx>0j/J  
 data.hWnd=GetSafeHwnd(); [@s5v  
 data.uID=98; bW'Y8ok[v  
 Shell_NotifyIcon(NIM_DELETE,&data); 6M8(KN^  
 ShowWindow(SW_SHOW); -%t8a42  
 SetForegroundWindow(); -ktYS(8&  
 ShowWindow(SW_SHOWNORMAL); Gs}lw'pK  
 bTray=FALSE; jg3['hTJT  
} a\I`:RO=<Z  
y"nC T3  
void CCaptureDlg::OnChange() Mz6|#P}.s  
{ Z ?w=-  
 RegisterHotkey(); UX'tdB !A  
} @gJPMgF$F  
aII:Pzh]B  
BOOL CCaptureDlg::RegisterHotkey() An !i  
{ NW Pd~l+  
 UpdateData(); .GPuKP|  
 UCHAR mask=0; h3A|nd>\  
 UCHAR key=0; j;*= ^s  
 if(m_bControl)  aK9zw  
  mask|=4; MK4CggoC  
 if(m_bAlt) '}NH$ KA  
  mask|=2; z.kBQ{P  
 if(m_bShift) 2wgdrO|B  
  mask|=1; 2{#=Ygb0  
  key=Key_Table[m_Key.GetCurSel()]; 8L(KdDY  
 if(bRegistered){ S'v UxOAo  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Al]z =  
  bRegistered=FALSE; k :zGv  
 } +;;pM[U  
 cMask=mask; m^,3jssdA  
 cKey=key; wijY]$  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 1) G6  
 return bRegistered; H*>5ne=x  
} . J*2J(T,  
UIw6~a3E  
  四、小结 z[_Gg8e  
{pB9T3ry]  
  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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