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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: 9g >]m 6  
  6VolTy@(x  
  一、实现方法 8~:qn@ Z|E  
f'Wc_ 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: sBS\S  
T_6,o[b8  
#pragma data_seg("shareddata") &of%;>$>M  
HHOOK hHook =NULL; //钩子句柄 Mp?Ev.  
UINT nHookCount =0; //挂接的程序数目 p}uL%:Vr  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 t?28s/?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9/D+6hJ]:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey go6Hb>  
static int KeyCount =0; a~OCo  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ,nMLua\  
#pragma data_seg() P^v`5v  
Qz{:m  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 !fwLC"QC  
Xo(K*eIN  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 6 )0$UW  
WXNJc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR IyOujdKa  
cKey,UCHAR cMask) ?Z( 6..&  
{ -}2q-  
 BOOL bAdded=FALSE; [sFD-2y  
 for(int index=0;index<MAX_KEY;index++){ ZNFn^iuQ  
  if(hCallWnd[index]==0){ \`{ YqOT  
   hCallWnd[index]=hWnd; >~TLgq*  
   HotKey[index]=cKey; BI;in;Ln  
   HotKeyMask[index]=cMask; ]. 1[H~5N  
   bAdded=TRUE; + R])u5c'  
   KeyCount++; 0Z2![n  
   break; Gi]Pwo${  
  } dQ`ch~HVUW  
 } KLsTgo|J  
 return bAdded; 4&K~EX"^T  
} $&n!j'C:  
//删除热键 (8@._  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) SWO$# X /  
{ )eY3[>`  
 BOOL bRemoved=FALSE; NJs )2  
 for(int index=0;index<MAX_KEY;index++){ \M=" R-&b  
  if(hCallWnd[index]==hWnd){ ff-9NvW4v  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Rla1,{1  
    hCallWnd[index]=NULL; nXb;&n%  
    HotKey[index]=0; t=iy40_T  
    HotKeyMask[index]=0; .cQwj L  
    bRemoved=TRUE; kxWf1hIz0  
    KeyCount--; "J, ErnM  
    break; $oq&uL  
   } #p*{p)]HiA  
  } p[hA?dXn  
 } n8A*Y3~R  
 return bRemoved; MCe =RR  
} KSqWq:W+  
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uV52ko,  
  DLL中的钩子函数如下: PS`v3|d}}}  
(Pin9^`ALc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) %1@+pf/  
{ GasIOPzK  
 BOOL bProcessed=FALSE; d;:+Xd`  
 if(HC_ACTION==nCode) b0tr)>d  
 { h/V0}|b  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~ ${. sD\  
   switch(wParam) KxGK`'E'r  
   {  n_)d4d zl  
    case VK_MENU:  -"\z|OQ  
     MaskBits&=~ALTBIT; bf'@sh%W  
     break; 9FX'Uws  
    case VK_CONTROL: 4ZQX YwfC|  
     MaskBits&=~CTRLBIT; /tJJ2 =%l  
     break; Ca*^U-  
    case VK_SHIFT: #`<|W5  
     MaskBits&=~SHIFTBIT; JdfjOlEb  
     break; 9W 5vp:G  
    default: //judge the key and send message E{_p&FF  
     break; G7M:LcX  
   } Hl?\P6   
   for(int index=0;index<MAX_KEY;index++){ _E:]qv  
    if(hCallWnd[index]==NULL) .AWRe1?  
     continue; 'S)}mG_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r_-iOxt~5  
    { xdXt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,l#V eC  
     bProcessed=TRUE; c+_F nA  
    } g Uy >I(  
   } +[V?3Gdb  
  } xQm!  
  else if((lParam&0xc000ffff)==1){ //有键按下 enO5XsIc  
   switch(wParam) )`,3/i9C$  
   { :p=IZY  
    case VK_MENU: PE]jYyyHtU  
     MaskBits|=ALTBIT; V!DQ_T+a  
     break; Fj7cI +  
    case VK_CONTROL: |TkMrj0  
     MaskBits|=CTRLBIT; S)n ~^q  
     break; My5h;N@C  
    case VK_SHIFT: x!tCK47Yq  
     MaskBits|=SHIFTBIT; [wjA8d.  
     break; L@ql)Lc);  
    default: //judge the key and send message @L=xY[&{  
     break; p3\F1](Z  
   } e#0R9+"Ba  
   for(int index=0;index<MAX_KEY;index++){ /$%apci8  
    if(hCallWnd[index]==NULL) ]}w ~fjq  
     continue; {Tm31f(oD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ](aXZ<,  
    { Ih{(d O;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |*fGG?}  
     bProcessed=TRUE; V'mQ {[{R  
    } C^2Tql  
   } \.POb5]p0  
  } /U`"Xx  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $eCxpb..  
   for(int index=0;index<MAX_KEY;index++){ {Ymn_   
    if(hCallWnd[index]==NULL) 2VrF~+  
     continue; A]WU*GL2H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zyu4!  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Eii)zo8Xd  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 `$AX!,<!G  
   } H CZ#7Z  
  } Vge9AH:op  
 } \{\*h/m  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); MIsjTKE  
} q#xoM1  
GASDkVoij  
  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: $GSn#} yz  
VEkv JX.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3T'9_v[Y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JpcG5gX^B  
p[!&D}&6h  
  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: VA&_dU]*  
d!D#:l3;  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >KNiMW^V  
{ ]t=m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) LS}u6\(  
 { 5hr$tkk L  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 MXh0a@*]  
  SaveBmp(); K63OjR >H  
  return FALSE; &u&/t?  
 } @a'Rn  
 …… //其它处理及默认处理 P6!c-\  
} [o<Rgq 4  
dzjp,c@  
\'xF\V  
  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。 /vYuwaWG=  
Tv_KdOv8  
  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。 \xlelsmB*  
XT9]+b8(M  
  二、编程步骤 Sp]"Xr)  
,,sKPj[  
  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"; <~X4&E]rT_  
,6=j'j1#a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; M2W4 RovfR  
z\]]d?d?;  
  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; 7 y5`YJ}!  
_D1Uc|  
  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; @SjISZw_  
z\Hg@J&#  
  5、 添加代码,编译运行程序。 3yX^93  
r5M {*  
三、程序代码 }^ +E S^~  
<~@}r\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL LUc!a4i"fO  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Za_w@o  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ _ I"}3*  
#if _MSC_VER > 1000 v*iD)k:|t  
#pragma once K| %.mc s4  
#endif // _MSC_VER > 1000 y-6k<RN  
#ifndef __AFXWIN_H__ *'H0%GM  
#error include 'stdafx.h' before including this file for PCH &b'IYoe  
#endif J~Uq'1?  
#include "resource.h" // main symbols 97l<9^$  
class CHookApp : public CWinApp  Gf_Je   
{ ?41bZ$j  
 public: #Z#rOh  
  CHookApp(); C jISU$O  
  // Overrides $9YAq/#Q  
  // ClassWizard generated virtual function overrides NX%"_W/W  
  //{{AFX_VIRTUAL(CHookApp) NOM6},rp  
 public: 'i+j;.  
  virtual BOOL InitInstance(); \NU^Jc_k7  
  virtual int ExitInstance(); :%7y6V*  
  //}}AFX_VIRTUAL T&+*dyNxMK  
  //{{AFX_MSG(CHookApp) PvF3a `&r  
  // NOTE - the ClassWizard will add and remove member functions here. !k@ (}CN_*  
  // DO NOT EDIT what you see in these blocks of generated code ! O$z XDxn  
  //}}AFX_MSG QiC}hj$  
  DECLARE_MESSAGE_MAP() ]s_,;PGU  
}; iga.B  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~ES6Qw`Oe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ywQ[>itMa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S9RH&/^H  
BOOL InitHotkey(); GB,f'Afl  
BOOL UnInit(); ~+|Vzm|S}  
#endif yAD-sy +/  
\GYrP f$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. gr1NcHu  
#include "stdafx.h" #0$fZ  
#include "hook.h" +lC?Vpi^  
#include <windowsx.h> hhWIwR  
#ifdef _DEBUG o|`[X '  
#define new DEBUG_NEW y/i{6P2`,D  
#undef THIS_FILE  B0 E`C  
static char THIS_FILE[] = __FILE__; c(Ws3  
#endif ?, B4  
#define MAX_KEY 100 K Q^CiX  
#define CTRLBIT 0x04 F3nYMf  
#define ALTBIT 0x02 j/ [V<  
#define SHIFTBIT 0x01 SG \6qE~  
#pragma data_seg("shareddata") .ni<'  
HHOOK hHook =NULL; =EFCd=i  
UINT nHookCount =0; v}\4/u  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _4,/uG|a O  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT CCDU5l$$  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #mKF)W  
static int KeyCount =0; ~'1gX`o:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @*e5(@R  
#pragma data_seg() ~(*2 :9*0  
HINSTANCE hins; Op()`x m  
void VerifyWindow(); E<RPMd @a  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) fofYe0z  
//{{AFX_MSG_MAP(CHookApp) ,="hI:*<  
// NOTE - the ClassWizard will add and remove mapping macros here. {ooztC   
// DO NOT EDIT what you see in these blocks of generated code! FD'yT8]"  
//}}AFX_MSG_MAP cl04fqX  
END_MESSAGE_MAP() #ZkT![ `  
!,lk>j.V  
CHookApp::CHookApp() 9]C%2!Ur,  
{ B/O0 ~y!n  
 // TODO: add construction code here, "w&IO}j;=  
 // Place all significant initialization in InitInstance Oh# z zo  
} |xawguJ  
:A7\eN5  
CHookApp theApp; dJv2tVm&'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?}RPn f  
{ +>3jMs~&  
 BOOL bProcessed=FALSE; t =V| '  
 if(HC_ACTION==nCode) 3c%_RI.  
 { m^%@bu,  
  if((lParam&0xc0000000)==0xc0000000){// Key up bog3=Ig-  
   switch(wParam) 3_bqDhVI5  
   { )Fgu'  
    case VK_MENU: y0f:N U  
     MaskBits&=~ALTBIT; R_W6}  
     break; :W^\ } UX4  
    case VK_CONTROL: CY~ S{w  
     MaskBits&=~CTRLBIT; t"JE+G  
     break; D*&#}c,*  
    case VK_SHIFT: GJ5R <f9I  
     MaskBits&=~SHIFTBIT; s Poh\n  
     break; n&l(aRoyx  
    default: //judge the key and send message ?wP/l  
     break; `G0k)eW  
   } Um^4[rl:#g  
   for(int index=0;index<MAX_KEY;index++){ RDfv D|}VN  
    if(hCallWnd[index]==NULL) )x+P9|  
     continue; '8Cg2v5&w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =kTHfdin&  
    { qxB|*P `  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j(A>M_f;  
     bProcessed=TRUE; 3{)!T;Wd  
    } ?;VsA>PV  
   } +=:_a$98  
  } `>0%Ha   
  else if((lParam&0xc000ffff)==1){ //Key down e@Mg9VwDc  
   switch(wParam) Yt[LIn-v:  
   { cgnMoBIc  
    case VK_MENU: LLc^SP j  
     MaskBits|=ALTBIT; 3xk_ZK82  
     break; 4VF4 8  
    case VK_CONTROL: J}NMF#w/;  
     MaskBits|=CTRLBIT; e"y-A&|  
     break; >?O?U=:<  
    case VK_SHIFT: IClw3^\l  
     MaskBits|=SHIFTBIT; IR:GoD+  
     break; 7Kf  
    default: //judge the key and send message jW]"Um-]  
     break; >AFQm  
   } <Drm#2x!E  
   for(int index=0;index<MAX_KEY;index++) yg.o?eML  
   { ~&?57Sw*m  
    if(hCallWnd[index]==NULL) N a$.VT  
     continue; =r4sF!g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Mz.C`Z>o  
    { NH;e|8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \ZM5J  
     bProcessed=TRUE; /qKA1-R}4  
    } cLEd -{x  
   } up{0ehr  
  } 4E2#krE%  
  if(!bProcessed){ o}DR p4;Ka  
   for(int index=0;index<MAX_KEY;index++){ _dELVs7OL  
    if(hCallWnd[index]==NULL) xax[# Vl4  
     continue; 3-btaG'P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +`bnQn]x+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  v%$l(  
   } ^&D5J\][  
  } _&~l,%)&  
 } ,hH c -%-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;*'I&  
} e^em^1H( %  
A_l\ij$Y  
BOOL InitHotkey() ny{S&f  
{ WMHYOJR  
 if(hHook!=NULL){ t{g@z3  
  nHookCount++; ^KdT,^6T  
  return TRUE; fF(AvMsO  
 } (/2rj[F&  
 else t{>#)5Pqv  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ber&!9  
  if(hHook!=NULL) 0$ON`Vsu|  
   nHookCount++; &@,lF{KTL  
  return (hHook!=NULL); ZJF"Yo  
} %%F, G  
BOOL UnInit() Ell14Iki  
{ 'z^'+}iyv  
 if(nHookCount>1){ Ypl;jkHP  
  nHookCount--; ^^&H:q  
  return TRUE; =@ acg0  
 } -<g[P_#  
 BOOL unhooked = UnhookWindowsHookEx(hHook); e`co:HO`#  
 if(unhooked==TRUE){ e/cHH3 4  
  nHookCount=0; `+T 2IPN  
  hHook=NULL; HU'w[r 6a  
 } $@@ii+W}\  
 return unhooked; 9i U/[d  
} &',#j]I  
^, YTQ.O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >-\^)z  
{ sBYDo{0 1  
 BOOL bAdded=FALSE; JN:L%If  
 for(int index=0;index<MAX_KEY;index++){ ^\g.iuE  
  if(hCallWnd[index]==0){ yH=<KYk  
   hCallWnd[index]=hWnd;  6/#+#T  
   HotKey[index]=cKey; '%4fQ%ID}  
   HotKeyMask[index]=cMask; wm^1Fn--  
   bAdded=TRUE; }-sh  
   KeyCount++; SOE-Kio=B  
   break; =xDxX#3  
  } %19~9Tw  
 }  pdm(7^  
 return bAdded; ,}\LC;31,  
} _p0gXb1m`  
DLP@?]BBOA  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4lR+nmAZ  
{ ? A;RTM  
 BOOL bRemoved=FALSE; O:8 u^ TP  
 for(int index=0;index<MAX_KEY;index++){ h<)ceD<,  
  if(hCallWnd[index]==hWnd){ qE3Ud:j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ]zVQL_%,  
    hCallWnd[index]=NULL; .?rs5[th*  
    HotKey[index]=0; oQrfrA&=M  
    HotKeyMask[index]=0; ]]_5_)"4  
    bRemoved=TRUE; Zn JJ-zP  
    KeyCount--; NC!B-3?x  
    break; ,"5HJA4  
   } T[^&ZS]s  
  } 4CchE15  
 } \pkK >R  
 return bRemoved; cuH5f}oc  
} ppRA%mhZ  
5Pq6X  
void VerifyWindow() 9od c :  
{ N<@K(? '  
 for(int i=0;i<MAX_KEY;i++){ `q\F C[W  
  if(hCallWnd!=NULL){ /k ?l%AH  
   if(!IsWindow(hCallWnd)){  H{yBD xw  
    hCallWnd=NULL; "!(@MfjT  
    HotKey=0; lz6CK  
    HotKeyMask=0; n|?sNM<J3  
    KeyCount--; zRmVV}b  
   } b$0;fEvIJn  
  } ?]bx]Y;  
 } ZbVn"he  
} )X," NJG  
"=K3sk  
BOOL CHookApp::InitInstance() V~#5^PF{  
{ ern\QAhXX  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); sVFX(yx0  
 hins=AfxGetInstanceHandle(); Xs|d#WbX  
 InitHotkey(); L~e0^X?  
 return CWinApp::InitInstance(); ;F*^c )  
} m>48?%  
rXz q :  
int CHookApp::ExitInstance() [kpQ:'P3  
{ $L( ,lB  
 VerifyWindow(); mE1Vr  
 UnInit(); =SuJ*  
 return CWinApp::ExitInstance(); /eU\B^k  
} KPDJ$,:  
V1Ojr~iM  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file w8~R=k  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) r_+!3   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ uH? 4d!G  
#if _MSC_VER > 1000 Ct?xTFb  
#pragma once nu:l;+,VY  
#endif // _MSC_VER > 1000 Z ztp %2c  
.b`8 +  
class CCaptureDlg : public CDialog suIYfjh  
{ 3?<A]"X.  
 // Construction ReD]M@;  
 public: ^fsC]9NS  
  BOOL bTray; G;#xcld  
  BOOL bRegistered; nj00g>:>  
  BOOL RegisterHotkey(); etX(~"gG_  
  UCHAR cKey; ZwY mR=  
  UCHAR cMask; 6Y6t.j0vN.  
  void DeleteIcon(); N"RPCd_  
  void AddIcon(); ollVg/z  
  UINT nCount; !mWm@ }Ujg  
  void SaveBmp(); ~iiDy;"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor AB0}6g^O  
  // Dialog Data ~.J*_0~Ze  
  //{{AFX_DATA(CCaptureDlg) 6vTnm4  
  enum { IDD = IDD_CAPTURE_DIALOG }; gaNe\  
  CComboBox m_Key; 8 "NPj0  
  BOOL m_bControl; {/N8[?zML  
  BOOL m_bAlt; ge%QbU1J  
  BOOL m_bShift; 4Ozcs'}  
  CString m_Path; DzA'MX  
  CString m_Number; htrtiJ1  
  //}}AFX_DATA eJn_gKWb  
  // ClassWizard generated virtual function overrides K?e16;   
  //{{AFX_VIRTUAL(CCaptureDlg) [~cz| C#  
 public: K0o${%'@7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); wpC .!T  
 protected: ki2 `gLK  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support .X(qs1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); p/u  
  //}}AFX_VIRTUAL ek/zQM@%  
  // Implementation lb*;Z7fx<'  
 protected: P_mP ^L  
  HICON m_hIcon; `-cw[@uD  
  // Generated message map functions x[)]u8^A  
  //{{AFX_MSG(CCaptureDlg) 9An \uH)mL  
  virtual BOOL OnInitDialog(); U6wy^!_X9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]Lg~ I#/#  
  afx_msg void OnPaint(); ZQir?1=  
  afx_msg HCURSOR OnQueryDragIcon(); )K::WqR%w)  
  virtual void OnCancel(); O[L#|_BnEO  
  afx_msg void OnAbout(); HE_UHv  
  afx_msg void OnBrowse(); (E,[Ad,$  
  afx_msg void OnChange(); xe(7q1   
 //}}AFX_MSG g2^{+,/^K  
 DECLARE_MESSAGE_MAP() v@2@9/  
}; %qE"A6j  
#endif FL^t} vA  
VK,{Mu=.9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {[/A?AV;F  
#include "stdafx.h" ?dv-`)S&  
#include "Capture.h" ~ Al3Dv9x  
#include "CaptureDlg.h" .q:6F*,1M  
#include <windowsx.h> ZdY$NpR,  
#pragma comment(lib,"hook.lib") Btr>ek  
#ifdef _DEBUG cBOK@\x:Wi  
#define new DEBUG_NEW c05-1  
#undef THIS_FILE u0)9IZxc  
static char THIS_FILE[] = __FILE__; vr?u=_%Z  
#endif Pk(%=P ,  
#define IDM_SHELL WM_USER+1 9&Y|,&W  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /[/{m]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $\1M"a}F  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; omPxU2Jw  
class CAboutDlg : public CDialog /CKnXU;  
{ U1fqs{>  
 public: CK|AXz+EN  
  CAboutDlg(); =|empv#  
  // Dialog Data 'L9hM.+  
  //{{AFX_DATA(CAboutDlg) agruS'c g  
  enum { IDD = IDD_ABOUTBOX }; `(P71T  
  //}}AFX_DATA x;} 25A|  
  // ClassWizard generated virtual function overrides _(~ E8g  
  //{{AFX_VIRTUAL(CAboutDlg) UmMu|`  
 protected: nra)t|m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -k2|`t _  
  //}}AFX_VIRTUAL ?|}qT05  
  // Implementation 7h41E#  
 protected: 9B83HV4J  
  //{{AFX_MSG(CAboutDlg) (Jj xrZ+L  
  //}}AFX_MSG 9` VY)"rJ  
  DECLARE_MESSAGE_MAP() :9x]5;ma  
}; i-p,x0th  
f w)tWJVD  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ]c|JxgU  
{ @8aV*zjB  
 //{{AFX_DATA_INIT(CAboutDlg) 7i02M~*uS  
 //}}AFX_DATA_INIT 08k  
} Qgf|obrEi6  
&m9= q|;m  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BXxJra/V  
{ q&NXF (  
 CDialog::DoDataExchange(pDX); {-]K!tWda  
 //{{AFX_DATA_MAP(CAboutDlg) ;p <BiC$b  
 //}}AFX_DATA_MAP iyUnxqP  
} ,+C?UW  
w}(pc }^U  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =,qY\@fq  
 //{{AFX_MSG_MAP(CAboutDlg) <pKOFN%m  
 // No message handlers -'WR9M?fq  
 //}}AFX_MSG_MAP >XRf= :3  
END_MESSAGE_MAP() n+<  
,VUOsNN4\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) KIWHn_ :  
: CDialog(CCaptureDlg::IDD, pParent) -*ZQ=nomN  
{ xdaq` ^Bbt  
 //{{AFX_DATA_INIT(CCaptureDlg) d|~'#:y@  
  m_bControl = FALSE; @;{ZnRv14  
  m_bAlt = FALSE; x{So  
  m_bShift = FALSE; '0_W< lGB  
  m_Path = _T("c:\\"); $ rbr&TJ  
  m_Number = _T("0 picture captured."); T?jN/}qg  
  nCount=0; tO1k2<Z"Y&  
  bRegistered=FALSE; .A6pPRy e  
  bTray=FALSE; /!6 VP |  
 //}}AFX_DATA_INIT H0t#J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9U3}_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); E(1G!uu<  
} CQ Ei(ty  
10r!p: D  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) **AkpV)  
{ yOXEP  
 CDialog::DoDataExchange(pDX); V,[[# a)y  
 //{{AFX_DATA_MAP(CCaptureDlg) i*&b@.7N  
  DDX_Control(pDX, IDC_KEY, m_Key); g_>E5z.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); n? =O@yq  
  DDX_Check(pDX, IDC_ALT, m_bAlt); cf"!U+x  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,Tx38  
  DDX_Text(pDX, IDC_PATH, m_Path); ~-%z:Re'_  
  DDX_Text(pDX, IDC_NUMBER, m_Number); zJUT<%[U  
 //}}AFX_DATA_MAP =1)9>=}  
} oz|+{b}%  
}"%mP 4]&  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) < %<nh`D  
//{{AFX_MSG_MAP(CCaptureDlg) ~% `hh9]  
 ON_WM_SYSCOMMAND() :8N by$#V  
 ON_WM_PAINT() w6lx&K-  
 ON_WM_QUERYDRAGICON() ^Mhh2v  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) vJ 28A  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) XMxm2-%olP  
 ON_BN_CLICKED(ID_CHANGE, OnChange) T0b/txS  
//}}AFX_MSG_MAP R@>^t4#_Q0  
END_MESSAGE_MAP() ^)|tf\4  
GH3RRzp r  
BOOL CCaptureDlg::OnInitDialog() E\9HZ;}G  
{ 5UK}AkEe&x  
 CDialog::OnInitDialog(); N693eN!  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); +~ Y.m8  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5s4x%L (~}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .;,,{ ;  
 if (pSysMenu != NULL) j9/iBK\Y  
 { g@?R"  
  CString strAboutMenu; ]S@DVXH  
  strAboutMenu.LoadString(IDS_ABOUTBOX); &=T>($3r94  
  if (!strAboutMenu.IsEmpty()) '*&V7:  
  { I-kK^_0mV<  
   pSysMenu->AppendMenu(MF_SEPARATOR); |GPY bxzc  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K 4{[s z  
  } 7<2^8 `  
 } F`Z?$ 1  
 SetIcon(m_hIcon, TRUE); // Set big icon *lheF>^  
 SetIcon(m_hIcon, FALSE); // Set small icon NNJQDkO-I  
 m_Key.SetCurSel(0); {D,- Whi  
 RegisterHotkey(); C9FAX$$^(Y  
 CMenu* pMenu=GetSystemMenu(FALSE); <5h}\5#<j  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &&"+\^3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); c@j3L23B  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6vU%Y_n=y]  
 return TRUE; // return TRUE unless you set the focus to a control lD# yXLaC\  
} ~~p)_  
}<'ki ;  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) tv]9n8v  
{ =*6H!bzX  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9Nz}'a;?>  
 { 8`I,KkWg   
  CAboutDlg dlgAbout; 1n.F`%YG  
  dlgAbout.DoModal(); &,,:pL[  
 } n-dC!t   
 else Z`%^?My  
 { _tQM<~Y]u\  
  CDialog::OnSysCommand(nID, lParam); l Yj$ 3  
 } onv0gb/J  
} V-63   
aHitPPlq  
void CCaptureDlg::OnPaint() O[|X=ZwR:l  
{ HA&hu /mw_  
 if (IsIconic()) Fd%JF#Hk  
 { T=g2gmo9  
  CPaintDC dc(this); // device context for painting PbV1FB_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4O{,oN~7  
  // Center icon in client rectangle D7jbo[GgS  
  int cxIcon = GetSystemMetrics(SM_CXICON); qR%as0;  
  int cyIcon = GetSystemMetrics(SM_CYICON); YWk+}y}^d  
  CRect rect; Tg=P*HY6  
  GetClientRect(&rect);  Tx'anP  
  int x = (rect.Width() - cxIcon + 1) / 2; 4:s,e<Tc4v  
  int y = (rect.Height() - cyIcon + 1) / 2; ?+{_x^  
  // Draw the icon G6\`Iy68/v  
  dc.DrawIcon(x, y, m_hIcon); S]&aDg1y}  
 } !rZZ/M"i  
 else /(%!txSNEt  
 { CRNt5T>qH  
  CDialog::OnPaint(); C_h$$G{S(  
 } 6y{CM/DC  
} TeJ=QpGW2  
ArT@BqWd  
HCURSOR CCaptureDlg::OnQueryDragIcon() .rlLt5b%  
{ a`U/|[JM  
 return (HCURSOR) m_hIcon; _@_EQ!=  
} .[?2_e#9%  
I&% Z*H  
void CCaptureDlg::OnCancel() ^i@0P}K<  
{ eK\i={va  
 if(bTray) uj)fah?Wg  
  DeleteIcon(); idjk uB(6  
  CDialog::OnCancel(); v++&%  
} {~'Iu8TvZ  
O`9vEovjs  
void CCaptureDlg::OnAbout() O6\c1ha  
{ A":cS }Ui  
 CAboutDlg dlg; JE eXoGKd  
 dlg.DoModal(); *qr>x8OGp  
} mWMtz]M}  
1>bNw-kz7  
void CCaptureDlg::OnBrowse() +h1X-K:I  
{ yy`XtJBWWs  
 CString str; n<A<Xj08T9  
 BROWSEINFO bi; hN\Q&F!  
 char name[MAX_PATH]; xo!2 GPD.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y7')~C`up^  
 bi.hwndOwner=GetSafeHwnd(); `"#hhKG  
 bi.pszDisplayName=name; F&7^M0x\ O  
 bi.lpszTitle="Select folder"; aR)w~s\6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; wOEc~WOd  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); wF*9%K'E  
 if(idl==NULL) "9NWsy}<c  
  return; wEU=R>j.  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); TALiH'w6|e  
 str.ReleaseBuffer(); >h$Q%w{V  
 m_Path=str; -6e^`c6{  
 if(str.GetAt(str.GetLength()-1)!='\\') D]WrPWL8v  
  m_Path+="\\"; 9LSV^[QUH  
 UpdateData(FALSE); qv<^%7gq  
} e?KzT5j:  
~sNBklK  
void CCaptureDlg::SaveBmp() \9R=fA18  
{ 0~Xt_rN](  
 CDC dc; P!XO8X 1F  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); d@ ] N  
 CBitmap bm; nPjK=o`KR  
 int Width=GetSystemMetrics(SM_CXSCREEN); n.G.f bO  
 int Height=GetSystemMetrics(SM_CYSCREEN); xiqeKoAD  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #[Rs&$vQm  
 CDC tdc; 64Tb,AL_  
 tdc.CreateCompatibleDC(&dc); Zlrbd  
 CBitmap*pOld=tdc.SelectObject(&bm); nx%eq ,Pq  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); $dsLU5]1o  
 tdc.SelectObject(pOld); ^-"tK:{  
 BITMAP btm; ^AoX|R[1%  
 bm.GetBitmap(&btm); D/wJF[_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; yqP=6   
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); CQ7NQ^3k  
 BITMAPINFOHEADER bih; _.I58r  
 bih.biBitCount=btm.bmBitsPixel; jI9#OEH_g  
 bih.biClrImportant=0; 8= g~+<A  
 bih.biClrUsed=0; ;(Az   
 bih.biCompression=0; f6{.Uq%SGp  
 bih.biHeight=btm.bmHeight; }%D${.R]  
 bih.biPlanes=1; |<uBJ-5  
 bih.biSize=sizeof(BITMAPINFOHEADER); PO ,zP9  
 bih.biSizeImage=size;  6NSSuK3  
 bih.biWidth=btm.bmWidth; 4E+8kz'  
 bih.biXPelsPerMeter=0; v4Kf{9q#  
 bih.biYPelsPerMeter=0; ^ ~dC&!D  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #+$ PD`j  
 static int filecount=0; (i1p6  
 CString name; L^K,YlNBR  
 name.Format("pict%04d.bmp",filecount++); s|X_:3\x  
 name=m_Path+name; /[n]t  
 BITMAPFILEHEADER bfh; }'Ph^ %ox  
 bfh.bfReserved1=bfh.bfReserved2=0; p[)yn%uh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); t. DnF[  
 bfh.bfSize=54+size; vI:_bkii  
 bfh.bfOffBits=54; >:BgatyPH  
 CFile bf; qx*N-,M%k(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .:e#!~Ki  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *e:2iM)8~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); FtlJ3fB@  
  bf.WriteHuge(lpData,size); z 0F55<i  
  bf.Close(); Dn#UcMO>W  
  nCount++; qxYCT$1  
 } $x#qv1  
 GlobalFreePtr(lpData);  `YO&  
 if(nCount==1) [w)KNl  
  m_Number.Format("%d picture captured.",nCount); RJ{J~-q{  
 else ezri9\Ju  
  m_Number.Format("%d pictures captured.",nCount); lA`-"  
  UpdateData(FALSE); GH&5m44   
} yh).1Q-D  
'z@]hm#  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?v'CuWS  
{ p4kK" \ln  
 if(pMsg -> message == WM_KEYDOWN) +U?73cYN  
 { Ak$9\Sl  
  if(pMsg -> wParam == VK_ESCAPE) /;xrd\du  
   return TRUE; \gv-2.,  
  if(pMsg -> wParam == VK_RETURN) .k#O[^~]  
   return TRUE; ,'sDauFn  
 } `>RM:!m6=$  
 return CDialog::PreTranslateMessage(pMsg); 8cRc5X  
} , 10+Sh  
v "[<pFj^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !>&G+R+k  
{ Yk*_u}?#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ g;:3I\ L  
  SaveBmp(); $"#M:V @  
  return FALSE; +aqQa~}r  
} [$fB]7A  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ VW^q|B yB  
 CMenu pop; ~4c,'k@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); YfNN&G4_  
 CMenu*pMenu=pop.GetSubMenu(0); Iv{iJoe;UH  
 pMenu->SetDefaultItem(ID_EXITICON); QD1&"T<.d.  
 CPoint pt; U@(8)[?nxn  
 GetCursorPos(&pt); /gn\7&=P  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); >,rzPc)  
 if(id==ID_EXITICON) |C,]-mJG  
  DeleteIcon(); jP<6Q|5F  
 else if(id==ID_EXIT) E;"VI2F  
  OnCancel(); TT){15T;"  
 return FALSE; qR , 5  
} 1k"i"kRM  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vi[~Qt  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B =DV!oUg  
 AddIcon(); .dvs&+I  
 return res; Svs&?B\}{6  
} }R:oWR  
Eok8+7g0&  
void CCaptureDlg::AddIcon() #}8VUbJ  
{ OSom-?|w  
 NOTIFYICONDATA data; P8tCzjrV  
 data.cbSize=sizeof(NOTIFYICONDATA); jT;'T$  
 CString tip; a(h@4 x  
 tip.LoadString(IDS_ICONTIP); FtWO[*#  
 data.hIcon=GetIcon(0); F'_z$,X6  
 data.hWnd=GetSafeHwnd(); <YWu/\{KT  
 strcpy(data.szTip,tip); P#;pQC  
 data.uCallbackMessage=IDM_SHELL; vJW`aN1<I3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Yt r*"-  
 data.uID=98; D^{jXNDNO  
 Shell_NotifyIcon(NIM_ADD,&data); lHu/pSu@k  
 ShowWindow(SW_HIDE); [ .3Gb}B  
 bTray=TRUE; (8em5  
} 2m72PU<.  
dE (d'*+a  
void CCaptureDlg::DeleteIcon() p%OVl[^jp  
{ $=C ` V  
 NOTIFYICONDATA data; gUp9yV  
 data.cbSize=sizeof(NOTIFYICONDATA); 9  I&[6}  
 data.hWnd=GetSafeHwnd(); wOH 3[SKo  
 data.uID=98; /&!o]fU1C  
 Shell_NotifyIcon(NIM_DELETE,&data); T{BGg  
 ShowWindow(SW_SHOW); 0+A#k7c6p  
 SetForegroundWindow(); \;"S>dg  
 ShowWindow(SW_SHOWNORMAL); Y2+YmP*z`  
 bTray=FALSE; 0BOL0<Wq  
} [c99m:*+  
3V]psZS  
void CCaptureDlg::OnChange() q?f-h<yRQ  
{ ikPr>  
 RegisterHotkey(); Wx8;+!2Q/  
} m# ^).+  
^;Yjs.bI`F  
BOOL CCaptureDlg::RegisterHotkey() MOIVt) ZY  
{ <(us(zbk]  
 UpdateData(); 9|9/8a6A  
 UCHAR mask=0; v/`#Gu^P  
 UCHAR key=0; [,|4%Y  
 if(m_bControl) < -Ax)zE  
  mask|=4; K%/g!t)  
 if(m_bAlt) };cH5bYF  
  mask|=2; %@;xbKj  
 if(m_bShift) ?;go5f+X  
  mask|=1; B{1yMJA  
  key=Key_Table[m_Key.GetCurSel()]; g;y*F;0@  
 if(bRegistered){ 5WtI.7r  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &hzr(v~;  
  bRegistered=FALSE; 1_LGlu~&  
 } C,{ Ekbg  
 cMask=mask; )/{~&L U  
 cKey=key; H]Gj$P=k  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); hud'@O"R+  
 return bRegistered; ,9 .NMFn  
} 0fR?zT?  
D\sh +}"  
  四、小结 BagV\\#v4  
mpl^LF[  
  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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