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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: tj<a , l  
  6d4)7PL  
  一、实现方法 XpS].P9  
!} ~K'1"  
  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: C^2J<  
w%Vw*i6o  
#pragma data_seg("shareddata") A"ApWJ3  
HHOOK hHook =NULL; //钩子句柄 &b~if}vcb  
UINT nHookCount =0; //挂接的程序数目 x"7`,W  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {\u=m>2U|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 D}YAu,<K  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey d'y\~M9(  
static int KeyCount =0; KicPW}_  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 vK@t=d  
#pragma data_seg() L!2BE[~  
Ut|G.%1Vd%  
  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。 -SO`wL NV  
]m&cVy&  
  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: :70n%3a  
bUJ5j kZ)  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 5^:N]Mp"  
cKey,UCHAR cMask) gN./u   
{ _\mMgZu  
 BOOL bAdded=FALSE; %uA\Le  
 for(int index=0;index<MAX_KEY;index++){ }fzv9$]$  
  if(hCallWnd[index]==0){ rsSE*(T t  
   hCallWnd[index]=hWnd; yhwwF n\  
   HotKey[index]=cKey; >d1gVBhk  
   HotKeyMask[index]=cMask; VEUdw(-?s  
   bAdded=TRUE; [3&Y* W  
   KeyCount++; DSb/+8KT  
   break; * }\}@0%  
  } #*r u*  
 } ;G 27S<Q  
 return bAdded; 3JnBKh\n  
} Dj0`#~  
//删除热键 ^ hoz<Ns  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LY> -kz]  
{ 8~q%H1[I\N  
 BOOL bRemoved=FALSE; ;ndsq[k>  
 for(int index=0;index<MAX_KEY;index++){ <Vu/6"DP  
  if(hCallWnd[index]==hWnd){ z^xrB$8 u  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ cU`sA_f  
    hCallWnd[index]=NULL; n+Bh-aV  
    HotKey[index]=0; [ vWcQ6m  
    HotKeyMask[index]=0; gt~hUwL  
    bRemoved=TRUE; _DlkTi5(w  
    KeyCount--; AL(YQ )-Cg  
    break; %(72+B70R  
   } <0?h$hf4c  
  } 7J:zIC$u>  
 } lL6 bIjf  
 return bRemoved; u>e4;f`F  
} 7*D*nY4+  
MJxTzQE  
*cNqgw#\qL  
  DLL中的钩子函数如下: *C>B-j$  
b ] W^_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `F)Q=  
{ eYJ6&).F  
 BOOL bProcessed=FALSE; Y%1 J[W  
 if(HC_ACTION==nCode) 6L`{oSX!  
 { Q $wa<`  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 g`(' k5=  
   switch(wParam) =SY5E{`4p  
   {  OB-2xmZW  
    case VK_MENU: yW3X<  
     MaskBits&=~ALTBIT; X[F<sxw  
     break; XI>|"*-l  
    case VK_CONTROL: aqa%B  
     MaskBits&=~CTRLBIT; 2 d%j6D  
     break; IIn0w2:i  
    case VK_SHIFT: .Fdqn?c|+  
     MaskBits&=~SHIFTBIT; Q"2t :  
     break; F.nJX ZnJ  
    default: //judge the key and send message UD 0v ia  
     break; [#}A]1N  
   } }4 p3m]   
   for(int index=0;index<MAX_KEY;index++){ .Vy*p")"  
    if(hCallWnd[index]==NULL) Y ;JP r  
     continue;  }YPW@g  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) fWr6f`de  
    { }=d]ke9_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J?Y1G<&  
     bProcessed=TRUE; t")+ L{  
    } %&D,|Yl6  
   } ?2#!63[Kg  
  } <4caG2~q  
  else if((lParam&0xc000ffff)==1){ //有键按下 [P'crV,m  
   switch(wParam) ?zypF 5a  
   { 5P?7xRA  
    case VK_MENU: Sk*-B@!S  
     MaskBits|=ALTBIT; ~S5wfx&  
     break; `vkNp8|  
    case VK_CONTROL: x2 s%qZ#  
     MaskBits|=CTRLBIT; s|/m}n  
     break; /U|>  
    case VK_SHIFT: a{?`yO/ 2  
     MaskBits|=SHIFTBIT; _.Ey_K_1  
     break; O{0TS^  
    default: //judge the key and send message ~j1.;WId[  
     break; $]&0`F  
   } i&|fGX?-I  
   for(int index=0;index<MAX_KEY;index++){ Y Mes314"  
    if(hCallWnd[index]==NULL) l~f>ve|  
     continue; 81O\BO.T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u!&w"t61Nd  
    { OHz>B!`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SAuZWA4g[  
     bProcessed=TRUE; VxlK:*t`  
    } q T16th[D  
   } ."N`X\  
  } KJ7[DN'(  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $jLJ&R=?]  
   for(int index=0;index<MAX_KEY;index++){ A7{l60(5  
    if(hCallWnd[index]==NULL) ^LA.Y)4C2%  
     continue; 8{mQmG4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) h)O<bI8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WYHr'xJ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Iyo ey  
   } @B<B#  
  } DXbzl +R  
 } eSV_.uvsb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *b{C`[ =V  
} q>$[<TsE&}  
bzz{ p1e  
  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: ^8_`IT  
6mawcK:7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Je|D]w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C'iJFf gR  
(9;qV:0`  
  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: .EOHkhn  
a@1 r3az  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) HA +EuQE"  
{ %s]l^RZ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) SC'F,!  
 { gq$]jWtCD  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9J"Y   
  SaveBmp(); Yl65|=n e  
  return FALSE;  Bld%d:i  
 } Jk$XL<t  
 …… //其它处理及默认处理 <Pg]V:=g'  
} 9.bMA<X  
TEgmE9^`)7  
v-* CE[  
  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。 +y+-~;5iv  
\u|8MEB  
  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。 8vN}v3HV&  
fO!S^<9,-  
  二、编程步骤 T<p,KqH  
0baq696<F  
  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"; aLwd#/!  
Ek!$Ary  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; A+JM* eB  
p[Z'Fl  
  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; QlbhQkn  
G4!$48  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; (#w8/@JxF  
Z19d Ted33  
  5、 添加代码,编译运行程序。 NNWbbU3wjh  
rUunf'w`e1  
三、程序代码 qXHr"  
bL=32YS  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL (7P{k<5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a'/yN{?p  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ @!92Ok  
#if _MSC_VER > 1000 QOG S` fh  
#pragma once 7\'ow|)}v  
#endif // _MSC_VER > 1000 F8q&v"  
#ifndef __AFXWIN_H__ O*af`J{  
#error include 'stdafx.h' before including this file for PCH L{>XT  
#endif ]rEFWA  
#include "resource.h" // main symbols gE,i Cx  
class CHookApp : public CWinApp #y~`nyg%|  
{ ulnG|3A9  
 public: RI#C r+/  
  CHookApp(); 4|+6a6  
  // Overrides .x__X3P>\  
  // ClassWizard generated virtual function overrides .uAO k0^z  
  //{{AFX_VIRTUAL(CHookApp) NN<kO#c+2  
 public: nwd 02tu  
  virtual BOOL InitInstance(); F,CQAgx  
  virtual int ExitInstance();  T)o)%Yv  
  //}}AFX_VIRTUAL `jR= X  
  //{{AFX_MSG(CHookApp) AT^?PD_  
  // NOTE - the ClassWizard will add and remove member functions here. &i`\`6 q  
  // DO NOT EDIT what you see in these blocks of generated code ! =2VM(GtK>  
  //}}AFX_MSG Dk#$PjcRE  
  DECLARE_MESSAGE_MAP() 'bP-p gc  
}; o;o ji  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); cw 3JSz9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =,D3e+P'  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jWb;Xk4  
BOOL InitHotkey(); q9- =>  
BOOL UnInit(); <De29'},y  
#endif xACAtJ'gc  
y8U|A0@$`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *Z7W'-  
#include "stdafx.h" &~ g||rq  
#include "hook.h" CtbmX)vE  
#include <windowsx.h> ;9,<&fe  
#ifdef _DEBUG ;0V{^  
#define new DEBUG_NEW f\ oB/  
#undef THIS_FILE GgH=w`;_  
static char THIS_FILE[] = __FILE__; %YhZ#>WT  
#endif w < p  
#define MAX_KEY 100  EthnI7Y  
#define CTRLBIT 0x04 clz6; P  
#define ALTBIT 0x02 *Yk3y-   
#define SHIFTBIT 0x01 w{[OtGIi3  
#pragma data_seg("shareddata") RdlcJxM  
HHOOK hHook =NULL; EEQW$W1@  
UINT nHookCount =0; umXa   
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 8U B-(~  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT c ?mCt0Cg  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Bb];qYuCO  
static int KeyCount =0; .bbl-a/ 3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -yt[0  
#pragma data_seg() ukV1_QeN [  
HINSTANCE hins; 1F'j .1  
void VerifyWindow(); 9)p VDS  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) l -~H Y*  
//{{AFX_MSG_MAP(CHookApp) y\Z7]LHCqw  
// NOTE - the ClassWizard will add and remove mapping macros here. #RK?3?wcr  
// DO NOT EDIT what you see in these blocks of generated code! |+//pGx  
//}}AFX_MSG_MAP X}`|"NIk.  
END_MESSAGE_MAP() @dAc2<4  
C7&4,],  
CHookApp::CHookApp() R;6(2bTN6  
{ 6\(wU?m'/  
 // TODO: add construction code here, xW*L^97 ;  
 // Place all significant initialization in InitInstance MyZ@I7Fb,  
} ZbJzf]y:6  
yG'5up  
CHookApp theApp; Ip]-OVg  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8>G3KZ3  
{ bH+p5Fd;  
 BOOL bProcessed=FALSE; > TG:}H(J  
 if(HC_ACTION==nCode) HK>!%t0S  
 { t^. U<M  
  if((lParam&0xc0000000)==0xc0000000){// Key up c@)k#/[[b  
   switch(wParam) ^w4FqdGM  
   { IbQ3*  
    case VK_MENU: ~4o2!!^tI  
     MaskBits&=~ALTBIT; Q9)/INh  
     break; ,qJ/Jt$A  
    case VK_CONTROL: l>)0OP]  
     MaskBits&=~CTRLBIT; gq`gitu0  
     break; $Jo[&,  
    case VK_SHIFT: w> `3{MTQ  
     MaskBits&=~SHIFTBIT; j{EN %  
     break; vINm2%*zJ  
    default: //judge the key and send message $trvNbco  
     break; ]ERPWW;^  
   } y4s]*?Wz  
   for(int index=0;index<MAX_KEY;index++){ 1]#qxjZ~  
    if(hCallWnd[index]==NULL) ]O s!=rt  
     continue; ),5^bl/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |cL'4I>b9  
    { tF SO"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F*rU=cu  
     bProcessed=TRUE; LBT{I)-K  
    } 2SEfEkk  
   } <jXXj[M2  
  } AQ 3n=Lr   
  else if((lParam&0xc000ffff)==1){ //Key down zghUwW|K  
   switch(wParam) j}Lt"r2F  
   { |xyN#wi  
    case VK_MENU: JnH>L|G{;%  
     MaskBits|=ALTBIT; 1Qui.],c  
     break; PiXegh WH  
    case VK_CONTROL: "ZF:}y  
     MaskBits|=CTRLBIT; ! %r5  
     break; V*SKWP  
    case VK_SHIFT: +=hiLfnE  
     MaskBits|=SHIFTBIT; &!#,p{}ccU  
     break; roYoxF;\  
    default: //judge the key and send message }|MGYS)  
     break; lN*O</L,"  
   } FR _R"p  
   for(int index=0;index<MAX_KEY;index++) m/3b7c@r  
   { B<(v\=xZ  
    if(hCallWnd[index]==NULL) `s(T (l  
     continue; XHcT7}]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %qL0=ad  
    { %,$/wh)<V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6-U|e|e  
     bProcessed=TRUE; O]RP?'vO  
    } ECqcK~h#E  
   } g76l@QYIU  
  } J2 {?P cs  
  if(!bProcessed){  UN[rW0*  
   for(int index=0;index<MAX_KEY;index++){ " jly[M}C  
    if(hCallWnd[index]==NULL) ENm\1  
     continue; :%Na-j9hV)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Xu $_%+46  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @x?7J@:  
   } K?:rrd=7q  
  } ST1PSuC~  
 } _x_om#~n  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W&dYH 4O  
} szN`"Yi){  
+xMK.*H]W  
BOOL InitHotkey() 6 ?F F !x  
{ E#X1P #$pW  
 if(hHook!=NULL){ !mH2IjcL  
  nHookCount++; >Du5B&41  
  return TRUE; /PF X1hSu  
 } $EHAHNL?Lx  
 else XNkw9*IT  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W*i PseXq  
  if(hHook!=NULL) x0B|CO  
   nHookCount++; WgPpW!`  
  return (hHook!=NULL); K4NB#  
} 2i`N26On  
BOOL UnInit() H5uWI  
{ Z5[TmVU  
 if(nHookCount>1){ <&E3QeK  
  nHookCount--; TcA+ov>TD  
  return TRUE; 7sZVN  
 } F`goYwA%  
 BOOL unhooked = UnhookWindowsHookEx(hHook); FglCqO}  
 if(unhooked==TRUE){ P3C|DO4  
  nHookCount=0; Rf2$k/lZ  
  hHook=NULL; <X~ X#9V  
 } S@;>lw,s!  
 return unhooked; k]W~_  
}  *e{d^  
67Rsd2   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) % FW__SN$c  
{ rld4uy}m  
 BOOL bAdded=FALSE; ycB>gd  
 for(int index=0;index<MAX_KEY;index++){ [ah%>&u  
  if(hCallWnd[index]==0){ A$ v Cm  
   hCallWnd[index]=hWnd; I_N(e|s\U  
   HotKey[index]=cKey; "&Ym(P  
   HotKeyMask[index]=cMask; }8J77[>/  
   bAdded=TRUE; T ) T0.c  
   KeyCount++; ?-[.H^]s~  
   break; \tE2@  
  } n}X)a-=  
 } 9^l_\:4  
 return bAdded; +ou5cQ^  
} Yoi4R{9c  
6n 37R#(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~]8bTw@  
{ m:A 7*r[  
 BOOL bRemoved=FALSE; tgEXX-{  
 for(int index=0;index<MAX_KEY;index++){ 1^rODfY0  
  if(hCallWnd[index]==hWnd){ .PBma/w W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){  pv1J6  
    hCallWnd[index]=NULL; f@lRa>Z(Fm  
    HotKey[index]=0; qV0C2jZ2  
    HotKeyMask[index]=0; 1"{3v@yi  
    bRemoved=TRUE; e.9oB<Etp  
    KeyCount--; m@  b~  
    break; EdxTaR  
   } U WYLT-^x  
  } 4SSq5Ve<  
 } (r,tU(  
 return bRemoved; ];bB7+  
} cU7 c}?J<  
)>08{7  
void VerifyWindow() mwLp~z%OX  
{ ?r C^@)  
 for(int i=0;i<MAX_KEY;i++){ jz(}P8  
  if(hCallWnd!=NULL){ NMb`d0;(  
   if(!IsWindow(hCallWnd)){ A; Rr#q<  
    hCallWnd=NULL; "Wd?U[[  
    HotKey=0; C'3/B)u}l  
    HotKeyMask=0; tAH,3Sz( /  
    KeyCount--; N6H/J_:  
   } NFTEp0eP  
  } :9!? ${4R  
 } ]p>6r*/nw  
} 6'd=% V  
JK0L&t<  
BOOL CHookApp::InitInstance() {#YGor|  
{ $>zLa_cn|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); =B O} hk  
 hins=AfxGetInstanceHandle(); p|VoIQY  
 InitHotkey(); DPR=Xls  
 return CWinApp::InitInstance(); aW$( lf2;  
} /pzEL  
Gr6XqO_  
int CHookApp::ExitInstance() E ?(+v  
{ 2)(P;[m^o  
 VerifyWindow(); =\H.C@r  
 UnInit(); vB(tpki|  
 return CWinApp::ExitInstance(); eED Fm  
} aV`4M VWOz  
lgp-/O"T  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file F<y$Q0Z}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) o(5Xj$Z  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ JJlwzH  
#if _MSC_VER > 1000 ;7CE{/Bq.p  
#pragma once D/C,Q|Ya6  
#endif // _MSC_VER > 1000 Z'iXuI49  
Bgs3sM9  
class CCaptureDlg : public CDialog }I_/>58  
{ `ZL~k  
 // Construction ;\yY*  
 public: > E;`;b  
  BOOL bTray; Wi]Mp7b  
  BOOL bRegistered; ]0<T,m Z  
  BOOL RegisterHotkey(); cd,)GF  
  UCHAR cKey; s\g"~2+  
  UCHAR cMask; gd3~R+Kd  
  void DeleteIcon(); `ro~l_U;A  
  void AddIcon(); ~ldqg2c  
  UINT nCount; r<4FF=  
  void SaveBmp(); +BcJHNIB  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v#i,pBj  
  // Dialog Data 2OFrv=F  
  //{{AFX_DATA(CCaptureDlg) .} <$2.  
  enum { IDD = IDD_CAPTURE_DIALOG };  J5 PXmL  
  CComboBox m_Key;  boAu  
  BOOL m_bControl; `PK1zSr  
  BOOL m_bAlt; T^YdAQeE  
  BOOL m_bShift; iW\cLp "  
  CString m_Path; <}x_F)E[t  
  CString m_Number; cSy{*K{B  
  //}}AFX_DATA d;UP|c>2  
  // ClassWizard generated virtual function overrides KO/Z|I  
  //{{AFX_VIRTUAL(CCaptureDlg) I_xvg >i  
 public: {p&M(W]  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *cn,[  
 protected: ],{b&\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *k$&U3=  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); !C>}j* 4  
  //}}AFX_VIRTUAL "{-jZdq'  
  // Implementation *{|{T_H:  
 protected: mk#xbvvG  
  HICON m_hIcon; t.Hte/,k  
  // Generated message map functions {w*5uI%%e  
  //{{AFX_MSG(CCaptureDlg) R/ 5aIh  
  virtual BOOL OnInitDialog(); I_66q7U"0  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?u`+?" 'H  
  afx_msg void OnPaint(); Tvf%'%h1  
  afx_msg HCURSOR OnQueryDragIcon(); "@Ir Bi6  
  virtual void OnCancel(); Ng=XH"ce~  
  afx_msg void OnAbout(); D9 `J||]E  
  afx_msg void OnBrowse(); OL|_@Fv`A  
  afx_msg void OnChange(); B ^>}M  
 //}}AFX_MSG .: ~);9kj  
 DECLARE_MESSAGE_MAP() RL0,QC)e#@  
}; GZgu1YR  
#endif 2uw1R;zw  
9&e=s<6dO  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {,z$*nf  
#include "stdafx.h" 3dm lP2  
#include "Capture.h" 1"k"<{%  
#include "CaptureDlg.h" y7J2: /@[x  
#include <windowsx.h> Dj!v+<b  
#pragma comment(lib,"hook.lib") CjRI!}S  
#ifdef _DEBUG []R`h*#  
#define new DEBUG_NEW Cz@[l=-T7  
#undef THIS_FILE 4E[ 9)n+YV  
static char THIS_FILE[] = __FILE__; P9(]9np,,  
#endif L|hsGm\  
#define IDM_SHELL WM_USER+1 y ;W|)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *`D(drnT{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YU! SdT$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ZZ/F}9!=  
class CAboutDlg : public CDialog \ci'Cbn\o  
{ C" vj#Tx  
 public: ox9$aBjJ  
  CAboutDlg(); O_@  
  // Dialog Data rXR=fj= 2  
  //{{AFX_DATA(CAboutDlg) WN8XiV  
  enum { IDD = IDD_ABOUTBOX }; ,m<t/@^]  
  //}}AFX_DATA yhF{ cK =  
  // ClassWizard generated virtual function overrides yu8xTh$:  
  //{{AFX_VIRTUAL(CAboutDlg) k@QU<cvI  
 protected: Nm;(M =  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Hrb67a%b  
  //}}AFX_VIRTUAL LRNgpjE}  
  // Implementation 7P!<c/ E  
 protected: {OHaI ;  
  //{{AFX_MSG(CAboutDlg) M1(+_W`  
  //}}AFX_MSG -P"9KnsO  
  DECLARE_MESSAGE_MAP() s~OGl PK  
}; uA]Z"  
1&\ A#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^&gu{kP  
{ d&mSoPf  
 //{{AFX_DATA_INIT(CAboutDlg) " sh%8 <N  
 //}}AFX_DATA_INIT @lvvI<U  
} I9JiH,+  
o/ Z  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ?"oW1a\  
{ x3cno#  
 CDialog::DoDataExchange(pDX); f0UB? |  
 //{{AFX_DATA_MAP(CAboutDlg) mI5BJ  
 //}}AFX_DATA_MAP W$_}lE$  
} <Z^P8nu  
[,;h1m ~iX  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) fB .xjp?  
 //{{AFX_MSG_MAP(CAboutDlg) ~zdHJ8tYp  
 // No message handlers Rw8l"`  
 //}}AFX_MSG_MAP 9='a9\((mH  
END_MESSAGE_MAP() a:$hK%^ \  
FdrH,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) d1MY>zq  
: CDialog(CCaptureDlg::IDD, pParent) Z/#l~.o[  
{ )a:j_jy  
 //{{AFX_DATA_INIT(CCaptureDlg) $#|iKi<Y@j  
  m_bControl = FALSE; R+}x#  
  m_bAlt = FALSE; \^=Wp'5R  
  m_bShift = FALSE; or2BG&W  
  m_Path = _T("c:\\"); X~ca8!Dq  
  m_Number = _T("0 picture captured."); 6|# +  
  nCount=0; 4dv5  
  bRegistered=FALSE; ){ywk  
  bTray=FALSE; $nX4!X  
 //}}AFX_DATA_INIT $F> #1:=v<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 sfLH[Q?  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 3awh>1N2 W  
} jkz .qo-%  
:)/%*<vq,  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Grot3a  
{ :-Gf GL>]  
 CDialog::DoDataExchange(pDX); "'389*-  
 //{{AFX_DATA_MAP(CCaptureDlg) T)QZ9a  
  DDX_Control(pDX, IDC_KEY, m_Key); 0UV5}/2rP  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); JY$B%R4;]  
  DDX_Check(pDX, IDC_ALT, m_bAlt); /`d|W$vN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ARcPHV<(2  
  DDX_Text(pDX, IDC_PATH, m_Path); A\{dq:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); L`$m<9w'  
 //}}AFX_DATA_MAP J$Huzs#  
} r3~~4Q4XI>  
#9HQW:On  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) s06tCwPp  
//{{AFX_MSG_MAP(CCaptureDlg) KC@F"/h`/  
 ON_WM_SYSCOMMAND() aD5jy  
 ON_WM_PAINT() ",U>;`  
 ON_WM_QUERYDRAGICON() j Wa%vA  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _,S L;*G4|  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T(< [k:`  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8#NI`s*  
//}}AFX_MSG_MAP qx#k()E.U  
END_MESSAGE_MAP() oH;0_!  
sY @S  
BOOL CCaptureDlg::OnInitDialog() ohI>\  
{ eVRFb#EU0e  
 CDialog::OnInitDialog(); -K+" :kiS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); eh`sfH  
 ASSERT(IDM_ABOUTBOX < 0xF000); @y )'h]d  
 CMenu* pSysMenu = GetSystemMenu(FALSE); d[h2Y/AR  
 if (pSysMenu != NULL) 'A#`,^]uLF  
 { -c%K_2`  
  CString strAboutMenu; )9(Mt _  
  strAboutMenu.LoadString(IDS_ABOUTBOX); RPb/U8  
  if (!strAboutMenu.IsEmpty()) Vfm (K  
  { &`` dI,NC  
   pSysMenu->AppendMenu(MF_SEPARATOR); ho 5mH{"OV  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `R}q&|o7<  
  } axf4N@  
 } .=y-T=}  
 SetIcon(m_hIcon, TRUE); // Set big icon e1*<9&S  
 SetIcon(m_hIcon, FALSE); // Set small icon o6{[7jI  
 m_Key.SetCurSel(0); Mi|PhDXMh  
 RegisterHotkey(); 'o%IA)sF  
 CMenu* pMenu=GetSystemMenu(FALSE); [&IJy  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  bnll-G|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z|';Y!kQ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); IU f1N+-z  
 return TRUE; // return TRUE unless you set the focus to a control <2{CR0]u  
} Gz>M Y4+G  
<<xUh|zE  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) B/P E{ /  
{ AsBep  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) QG~4 <zy  
 { *} yOL [  
  CAboutDlg dlgAbout; zn5U(>=c  
  dlgAbout.DoModal(); P[;<,U;'HO  
 } Q> Lh.U,{  
 else zF+NS]XK  
 { w Pk\dyP  
  CDialog::OnSysCommand(nID, lParam); ".n,R"EF  
 } W(5et5DN,  
} `# N j8  
Z/y&;N4  
void CCaptureDlg::OnPaint() jacp':T  
{ ,4RmT\%T  
 if (IsIconic()) @S69u s}  
 { ]u;Ma G=;  
  CPaintDC dc(this); // device context for painting SGuR-$U`)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ~Y- !PZ  
  // Center icon in client rectangle sTn}:A6  
  int cxIcon = GetSystemMetrics(SM_CXICON); v() wngn  
  int cyIcon = GetSystemMetrics(SM_CYICON); qs96($  
  CRect rect; .X D.'S  
  GetClientRect(&rect); u@( z(P  
  int x = (rect.Width() - cxIcon + 1) / 2; &$\B&Hp@  
  int y = (rect.Height() - cyIcon + 1) / 2; E?L^ L3s  
  // Draw the icon ZGstD2 N$  
  dc.DrawIcon(x, y, m_hIcon); 6 WD(  
 } 'qhi8=*  
 else \I! C`@0  
 { [M:ag_rm+f  
  CDialog::OnPaint(); Z0Tpz2m  
 } @O&<_&  
} KW3Dr`A  
!,;>)R   
HCURSOR CCaptureDlg::OnQueryDragIcon() W%3<"'eP  
{ JG]67v{F  
 return (HCURSOR) m_hIcon; Ts+S>$  
} m7GM1[?r  
P;A9t#\  
void CCaptureDlg::OnCancel() X:aLed_{f  
{ {_ &*"bK  
 if(bTray) m|:O:<  
  DeleteIcon(); ;WF3w  
  CDialog::OnCancel(); qDMVZb-(#  
} PrA?e{B5m  
lT`y=qR|  
void CCaptureDlg::OnAbout() 0E6>P E;  
{ byT@O:fL  
 CAboutDlg dlg; +#|| w9p  
 dlg.DoModal();  j-H2h  
} ,Z2fVz~9  
k&|#(1CFY  
void CCaptureDlg::OnBrowse() GFq,Ca~  
{ $#b@b[h<w  
 CString str; :\]TAQd-  
 BROWSEINFO bi; T^"-;  
 char name[MAX_PATH]; 6c[&[L%  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); X?2ub/Nr#Y  
 bi.hwndOwner=GetSafeHwnd(); E%A] 8y7  
 bi.pszDisplayName=name; {S+  $C  
 bi.lpszTitle="Select folder"; hkifd4#  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; cO&(&*J r  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4,nUCT  
 if(idl==NULL) V^v?;f?  
  return; 676r0`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); vlygS(Y_7  
 str.ReleaseBuffer(); Thlqe?  
 m_Path=str; N ,8^AUJ3&  
 if(str.GetAt(str.GetLength()-1)!='\\') OA_WjTwDs  
  m_Path+="\\"; f Fr[ &\[  
 UpdateData(FALSE); Q+Sx5JUR~  
} vz\^Aa #fv  
OoG Nij  
void CCaptureDlg::SaveBmp()  BZ'63  
{ 2 Nr*  
 CDC dc; &d!Q%  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); HDV@d^]-  
 CBitmap bm; 4#dS.UfI  
 int Width=GetSystemMetrics(SM_CXSCREEN); iSiez'  
 int Height=GetSystemMetrics(SM_CYSCREEN); _4Ciai2Ql  
 bm.CreateCompatibleBitmap(&dc,Width,Height); " R=,W{=  
 CDC tdc; #i t)  
 tdc.CreateCompatibleDC(&dc); !=-{$& {  
 CBitmap*pOld=tdc.SelectObject(&bm); ji8)/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~8A !..Z  
 tdc.SelectObject(pOld); ^ UB*Q  
 BITMAP btm; ZxDh94w/  
 bm.GetBitmap(&btm); 1N3qMm^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; X:0-FCT;\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); \dB)G<_  
 BITMAPINFOHEADER bih; :n%KHen3\  
 bih.biBitCount=btm.bmBitsPixel; +dw=)A#/  
 bih.biClrImportant=0; vv  F:  
 bih.biClrUsed=0; d=*&=r0!C{  
 bih.biCompression=0; O/N Ed)H!  
 bih.biHeight=btm.bmHeight; Q5kf-~Jx+  
 bih.biPlanes=1; KtR*/<7IC  
 bih.biSize=sizeof(BITMAPINFOHEADER); <i!:{'%  
 bih.biSizeImage=size; MBjo9P(  
 bih.biWidth=btm.bmWidth; E1"H( m&6  
 bih.biXPelsPerMeter=0; Xb/W[rcs  
 bih.biYPelsPerMeter=0; 8<2 [ F  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); B %L dH  
 static int filecount=0; Ub"6OT1tl  
 CString name; UP+4xG  
 name.Format("pict%04d.bmp",filecount++); ZLN79r{T  
 name=m_Path+name; 8|U-{"!O ?  
 BITMAPFILEHEADER bfh; kuQ+MQHs  
 bfh.bfReserved1=bfh.bfReserved2=0; hFLLg|@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /:BM]K  
 bfh.bfSize=54+size; q]^Q?r<g::  
 bfh.bfOffBits=54; /'g/yBY  
 CFile bf; `P(Otr[6  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 40M/Gu:  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +|iJQF  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); P { 8d.  
  bf.WriteHuge(lpData,size); '1f:8  
  bf.Close(); #mFY?Zp)  
  nCount++; YXFUZ9a#e  
 } axpn*(yE  
 GlobalFreePtr(lpData); ,cF $_7M  
 if(nCount==1) ws_/F  
  m_Number.Format("%d picture captured.",nCount); O{Y_j&1  
 else x&['g*[L0  
  m_Number.Format("%d pictures captured.",nCount); 2Nau]y]=  
  UpdateData(FALSE); $+%eLx*  
} LQr+)wI  
)W0zu\fL =  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =KCAHNr4?  
{ xO` `X<  
 if(pMsg -> message == WM_KEYDOWN) asLvJ{d8s  
 { Iu=n$H  
  if(pMsg -> wParam == VK_ESCAPE) FL8?<bU  
   return TRUE; q_G O;-b{  
  if(pMsg -> wParam == VK_RETURN) IXJ6w:E  
   return TRUE; 8s@k0T<O  
 } /,`40^U}  
 return CDialog::PreTranslateMessage(pMsg); C5ia9LpRX  
} :Qekv(z  
9Q.}jV  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ww^!|VVa  
{ w~lxWgaY7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ :tTP3 t5  
  SaveBmp(); aN,.pLe;  
  return FALSE; ;q ;}2  
} K7jz*|2  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ kbR!iPM-;  
 CMenu pop; s6F^z\6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); O"c@x:i  
 CMenu*pMenu=pop.GetSubMenu(0); -h|YS/$f  
 pMenu->SetDefaultItem(ID_EXITICON);  Xb'UsQ  
 CPoint pt; d8V)eZYXy~  
 GetCursorPos(&pt); uY"Bgz:=d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); aEJds}eE6)  
 if(id==ID_EXITICON) nUy2)CL[L  
  DeleteIcon(); K3xs=q]:@  
 else if(id==ID_EXIT) e ab_"W   
  OnCancel(); y wf@G; fK  
 return FALSE; ~ V:@4P  
} X v2u7T\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~4t7Q  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) JIYZ  
 AddIcon(); ?A\[EI^  
 return res; O.+02C_*  
} 9U=~t%qW$  
?yq $ >Qba  
void CCaptureDlg::AddIcon() YS|Ve*t(L=  
{ 7L"Pe'Hw  
 NOTIFYICONDATA data;  +bC=yR  
 data.cbSize=sizeof(NOTIFYICONDATA); r'/H3  
 CString tip; x]X!nx6G  
 tip.LoadString(IDS_ICONTIP); {r.yoI4e  
 data.hIcon=GetIcon(0); 8t$w/#'@  
 data.hWnd=GetSafeHwnd(); :~gG]|F  
 strcpy(data.szTip,tip); _=s{,t &u  
 data.uCallbackMessage=IDM_SHELL; ^|+;~3<J  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; `~S ; UG   
 data.uID=98; ~,: FZ1wh  
 Shell_NotifyIcon(NIM_ADD,&data); gb,X"ODq  
 ShowWindow(SW_HIDE); iAWd 9x  
 bTray=TRUE; __Tg1A  
} 3ug-cq  
~ v21b?   
void CCaptureDlg::DeleteIcon() =Kh1 HU.F  
{ ' 6#en9{L  
 NOTIFYICONDATA data; Kz`g Q|S  
 data.cbSize=sizeof(NOTIFYICONDATA); UrhSX!g/A>  
 data.hWnd=GetSafeHwnd(); pZA0Go2!IN  
 data.uID=98; =u,8(:R]s  
 Shell_NotifyIcon(NIM_DELETE,&data); h+<F,0  
 ShowWindow(SW_SHOW); {:!CA/0Jx  
 SetForegroundWindow();  E qc,/  
 ShowWindow(SW_SHOWNORMAL); wFHbz9|@I  
 bTray=FALSE; rcx'`CIJ  
} Ki_8g  
cf7UV6D g  
void CCaptureDlg::OnChange() hCX_^%  
{ <8_~60  
 RegisterHotkey(); j1 Q"s(  
} ^]A,Q%1q^  
$^XCI%DH  
BOOL CCaptureDlg::RegisterHotkey() S.$/uDwo  
{ P+j5_V{\b  
 UpdateData(); q4wS<, 3  
 UCHAR mask=0; XzH"dDAVE  
 UCHAR key=0; LE1#pB3TG  
 if(m_bControl) F]4JemSjK  
  mask|=4; QT\=>,Fz _  
 if(m_bAlt) o[ua$+67E  
  mask|=2; kbHfdA  
 if(m_bShift) JJ=%\j  
  mask|=1; )t#v55M  
  key=Key_Table[m_Key.GetCurSel()]; ja_.{Zv  
 if(bRegistered){ WU" Lu  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ha -KfkPFE  
  bRegistered=FALSE; `ywI+^b  
 } )rce%j7  
 cMask=mask; ztRe\(9bL  
 cKey=key; ),u)#`.l G  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (aQNe{D#  
 return bRegistered; },W<1*|  
} X\yy\`o  
4sCzUvI~Y1  
  四、小结 5 ?{ytNCY  
`uN}mC!r]  
  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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