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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: O!F]^'!  
  E_:QSy5G  
  一、实现方法 ]T<^{jG  
Dn;p4T@  
  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: >P(`MSc  
FjKq%.=#  
#pragma data_seg("shareddata") (xT*LF+  
HHOOK hHook =NULL; //钩子句柄 VXKT\9g3A  
UINT nHookCount =0; //挂接的程序数目 :L$4*8@`+  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ujzW|HW^v  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  Y7Gs7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey NGTe4Crx  
static int KeyCount =0; XD%wj  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 46XN3r  
#pragma data_seg() Z85|I.mr  
La,QB3K/  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 <y=ovkM3  
PZ OKrW  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: JLm @Ag  
"4 k-dj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?]!vRmZ;  
cKey,UCHAR cMask) > <Z'D  
{ %xlpB75N4N  
 BOOL bAdded=FALSE; .9M.|  
 for(int index=0;index<MAX_KEY;index++){ U[8{_h<#  
  if(hCallWnd[index]==0){ fE25(wCz7  
   hCallWnd[index]=hWnd; Yp5L+~J[  
   HotKey[index]=cKey; =3'(A14C=  
   HotKeyMask[index]=cMask; kX;$}7n  
   bAdded=TRUE; uP|FJLY  
   KeyCount++; SkP[|g'56  
   break; `deY i2z  
  } R]L2(' B  
 } sdr.u  
 return bAdded; Xr_pgW|  
} Ap<J'?~y  
//删除热键 HeIS;gfUY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) []}N  
{ A,XfD}+:Z  
 BOOL bRemoved=FALSE; 2p< Aj!  
 for(int index=0;index<MAX_KEY;index++){ ?2`$3[ET-  
  if(hCallWnd[index]==hWnd){ aiux^V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l)|lTOjb  
    hCallWnd[index]=NULL; >&K!VQ{g  
    HotKey[index]=0; &3DK^|Lq  
    HotKeyMask[index]=0; ]Yz'8uts  
    bRemoved=TRUE; I:;+n^N?  
    KeyCount--; ]b1Li}  
    break; ~j& ?/{7I  
   } Pes =aw  
  } F)ci9-b@  
 } VifmZ;S@Y  
 return bRemoved; <Dm Tj$  
} ^.HWkS`e  
c> ~:dcy  
n0fRu`SNV  
  DLL中的钩子函数如下: JAP (|  
 WL-0(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) GU6 qIz|  
{ Lb~\Y n'z  
 BOOL bProcessed=FALSE; {bkGYx5.C  
 if(HC_ACTION==nCode) rc{o?U'^-  
 { !$>G# +y  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 KwFXB  
   switch(wParam) Ay$>(;  
   {  u,9q<&,  
    case VK_MENU: lB:l)!]||=  
     MaskBits&=~ALTBIT; dR[o|r  
     break; ^k72{ 3N(  
    case VK_CONTROL: 'JZ_  
     MaskBits&=~CTRLBIT; yT:!%\F9  
     break; Pj!%ym3A  
    case VK_SHIFT: RVF F6N^  
     MaskBits&=~SHIFTBIT; R^tcr)(  
     break; fVUKvZ}P*  
    default: //judge the key and send message L@A9{,9Pl  
     break; s]x2DH+_  
   } j|4tiv>  
   for(int index=0;index<MAX_KEY;index++){ L82NP)St  
    if(hCallWnd[index]==NULL) x# 8IZ  
     continue; h48 bb.p2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8+(c1  
    { !-(J-45  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {B^pnLc  
     bProcessed=TRUE; 4ftj>O  
    } zoXuFg  
   } l1RlYl5  
  } `|,tCM&-  
  else if((lParam&0xc000ffff)==1){ //有键按下 AM/lbMr  
   switch(wParam) l<N?'&  
   {  -$R5  
    case VK_MENU: P"Rk?lL  
     MaskBits|=ALTBIT; 4  
     break; z7q%,yw3N  
    case VK_CONTROL: (xUFl@I!  
     MaskBits|=CTRLBIT; eT\p-4b  
     break; { _X#fq0}  
    case VK_SHIFT: vnZ/tF  
     MaskBits|=SHIFTBIT; 3@HIpQM3  
     break; Pz {Ig  
    default: //judge the key and send message 7'UWRRsxUF  
     break; sZm^&h;  
   } 4vGbG:x  
   for(int index=0;index<MAX_KEY;index++){ H%T3Pc  
    if(hCallWnd[index]==NULL) qKs7WBRJy  
     continue; 2'dG7lLu4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FB!z#Eim  
    { va+m9R0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =n)#!i  
     bProcessed=TRUE; /cY[at|p  
    } h7RD `k:mF  
   } +V89J!7  
  } S41)l!+2  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f#c BQ~  
   for(int index=0;index<MAX_KEY;index++){ =U_ @zDD@V  
    if(hCallWnd[index]==NULL) ZjavD^ky  
     continue; HnK/A0jM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) dw99FA6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5j1 IH,yW  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  p1?J  
   } + 1f{_v  
  } f>4+,@G   
 } ds')PIj  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); b)y<.pS\  
} {4)5]62>u  
:z124Zf  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: |vT=Nnu  
vT}pbOTh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NIL^UN}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qIk )'!Vk  
]o!&2:'N`  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 'F6#l"~/  
Y?e3Bx7*b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) bZnDd  
{ C64eDX^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) -%N}A3m!5  
 { rZ 6@b  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 rl41# 6  
  SaveBmp(); a6 * Y%?  
  return FALSE; P^n{Y~P=Q  
 } |:/ @t  
 …… //其它处理及默认处理 9XY|V<}  
} .Btv}b  
BiI{8`M!$x  
B~e7w 4  
  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。 {AtfK>D  
su%Z{f)#  
  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。 _"`uqW79  
Z#[>N,P  
  二、编程步骤 v@]6<e$  
uvNnW}G4  
  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"; { <~s&EPd  
W *|OOa'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Je@p5(f  
BD?F`%-x  
  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; J$<:/^t  
,at-ci\'  
  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; r)(i{:@r`  
yqC+P  
  5、 添加代码,编译运行程序。 fCs\Q  
.Wd.) ^?  
三、程序代码 E)RI!0Ra  
  -kV|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ,!8*g[^O  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4bFv"b  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Zu)i+GeG  
#if _MSC_VER > 1000 6Lav.x\W  
#pragma once GF9ZL  
#endif // _MSC_VER > 1000 moZ)|y  
#ifndef __AFXWIN_H__ |ORmS& 7  
#error include 'stdafx.h' before including this file for PCH v] W1F,u  
#endif ~x9 W{B]  
#include "resource.h" // main symbols 01UqDdoj  
class CHookApp : public CWinApp oR4fK td  
{ iRkOH]+K  
 public: +D6-m  
  CHookApp(); (4E.Li<O  
  // Overrides 2OA8 R}  
  // ClassWizard generated virtual function overrides Y!Usce  
  //{{AFX_VIRTUAL(CHookApp) (0O`A~M3  
 public: \E>%W  
  virtual BOOL InitInstance(); tOu90gu  
  virtual int ExitInstance(); vK[v eFH  
  //}}AFX_VIRTUAL =kyJaT^5[  
  //{{AFX_MSG(CHookApp) O[3q9*(  
  // NOTE - the ClassWizard will add and remove member functions here. (mu{~@Hw  
  // DO NOT EDIT what you see in these blocks of generated code ! 2M!+gk=+  
  //}}AFX_MSG I67k M{V  
  DECLARE_MESSAGE_MAP() la!1[VeL  
}; 0W!V V=j<}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); N8u_=b{X  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hXj* {vT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,S7~=S  
BOOL InitHotkey(); :qt82tbn  
BOOL UnInit(); 6:8EZ' y  
#endif ?tW%"S^D  
6kgCS{MZ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 6~>^pkV  
#include "stdafx.h"  4Ub?*  
#include "hook.h" ZA 99vO  
#include <windowsx.h> oX%PsS  
#ifdef _DEBUG )< X=z  
#define new DEBUG_NEW PxdJOtI"  
#undef THIS_FILE ft*G*.0kO  
static char THIS_FILE[] = __FILE__; rPrEEWS0)  
#endif iT)2 ?I6!  
#define MAX_KEY 100 mmh nw (/  
#define CTRLBIT 0x04 \" 5F;J  
#define ALTBIT 0x02 !nZI? z;  
#define SHIFTBIT 0x01 z+5u/t  
#pragma data_seg("shareddata") bw<~R2[  
HHOOK hHook =NULL; GN}9$:  
UINT nHookCount =0; vV\/pu8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey UU;Y sj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Y2ah zB  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s /k  
static int KeyCount =0; ?eY chVq  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #! K~_DL  
#pragma data_seg() jn5=N[hd  
HINSTANCE hins; +c~O0U1  
void VerifyWindow(); 2J>A;x_?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >=]NO'?O  
//{{AFX_MSG_MAP(CHookApp) Hzk1LKsT#  
// NOTE - the ClassWizard will add and remove mapping macros here. Wb*T   
// DO NOT EDIT what you see in these blocks of generated code! U?+30{hb  
//}}AFX_MSG_MAP 'Sb6 w+  
END_MESSAGE_MAP() 7.F& {:@_  
}(f,~?CP]  
CHookApp::CHookApp() $u0+29T2O  
{ AVdd?Ew  
 // TODO: add construction code here, r5X BcG(2  
 // Place all significant initialization in InitInstance c@"i?  
} 7csl1|U  
/3"e3{u y  
CHookApp theApp; oIu,rjb  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) z}Mb4{d1  
{ '/ ]fZ|  
 BOOL bProcessed=FALSE; 4)c"@Zf  
 if(HC_ACTION==nCode) PgGrk5;  
 { @EH4N%fH  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z7k1fv:S^  
   switch(wParam) ~Krg8s!F&  
   { ]h`E4B  
    case VK_MENU: .DM1Knj  
     MaskBits&=~ALTBIT; A~ %g"  
     break; s OrY^cY;  
    case VK_CONTROL: XEe+&VQmY  
     MaskBits&=~CTRLBIT; t9=|* =;9)  
     break; }I'>r(K  
    case VK_SHIFT: ttJ:[ R'  
     MaskBits&=~SHIFTBIT; Fg}5V,  
     break; 2EI m  
    default: //judge the key and send message 7\|NYT4  
     break; GoZJDE3  
   } gIf+.^/m1  
   for(int index=0;index<MAX_KEY;index++){ IhFw{=2*  
    if(hCallWnd[index]==NULL) [W7\c;Do  
     continue; h<z/LL8|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *+1"S ]YF  
    { } cH"lppX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .k?hb]2N  
     bProcessed=TRUE; t]YLt ,  
    } Z<m'he  
   } "}y3@ M^  
  } C[/U y  
  else if((lParam&0xc000ffff)==1){ //Key down l1.Aw|'D  
   switch(wParam) 30T:* I|  
   { P\G C8KV]  
    case VK_MENU:  q;He:vX  
     MaskBits|=ALTBIT; WZy6K(18"'  
     break; e]L3=R;  
    case VK_CONTROL: ]jT[dX|?  
     MaskBits|=CTRLBIT; @bVh?T0~F,  
     break; | 2c!t$O@v  
    case VK_SHIFT: hG0lR.:  
     MaskBits|=SHIFTBIT; 4OESsN$O  
     break; 8^ZM U{  
    default: //judge the key and send message ct4)faM  
     break; /%@RO^P  
   } @ #O|  
   for(int index=0;index<MAX_KEY;index++) 8Jly! =Qm5  
   { +cplM5X  
    if(hCallWnd[index]==NULL) 9zGKQ|X)  
     continue; myo~Qqt?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4mg 7f^[+  
    { ]t!}D6p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); '-1jWw:8  
     bProcessed=TRUE; <45dy5!Tz  
    } (? #U&  
   } Ok.DSOT  
  } H]n0JG9K  
  if(!bProcessed){ vpr @  
   for(int index=0;index<MAX_KEY;index++){ OuJ y$e  
    if(hCallWnd[index]==NULL)  "%@=?X8  
     continue; e+=G-u5}-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) RBp(dKxM$w  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :!*;0~#  
   } $hY]EB  
  } T>:g ME  
 } =v#A&IPA'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %X-&yGY  
} SoON@h/  
/3:IE%o  
BOOL InitHotkey() mjr{L{H=?+  
{ ."@a1_F|  
 if(hHook!=NULL){ Y_iF$ m/R  
  nHookCount++;  ! 6i  
  return TRUE; di P4]/%1  
 } /JY ph^3][  
 else HW%bx"r+4f  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); NBR'^6  
  if(hHook!=NULL) 9g,L1 W*  
   nHookCount++; ~}9H<K3V  
  return (hHook!=NULL); KV&_^xSoh|  
} 4O,a`:d1$6  
BOOL UnInit() u$`x]K=Zsm  
{ Mm[1Z;H  
 if(nHookCount>1){ 2|H'j~  
  nHookCount--; 8X~vJ^X9@y  
  return TRUE; 5r}(|86O/  
 } `uJ l<kHI  
 BOOL unhooked = UnhookWindowsHookEx(hHook); L\'qAfRZ  
 if(unhooked==TRUE){ `  vmk  
  nHookCount=0; a9q?9X  
  hHook=NULL;  C(Gb  
 } O5n] 4)<  
 return unhooked; eOnl s x/  
} lSsFI30  
0JWD] "  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lNnbd?D8  
{ .Im+()b&&  
 BOOL bAdded=FALSE; f(ec/0W  
 for(int index=0;index<MAX_KEY;index++){ F$.s6Hh.  
  if(hCallWnd[index]==0){ n'(n4qH2#s  
   hCallWnd[index]=hWnd; )ZT0zIG  
   HotKey[index]=cKey; Tqh Rs  
   HotKeyMask[index]=cMask; uN^qfJ'@ >  
   bAdded=TRUE; *[/Xhx"  
   KeyCount++; 4]Nr$FY  
   break; xM"XNT6b  
  } qk{UO <  
 } UDqKF85H  
 return bAdded; ,rPyXS9Sa{  
} z_0lMX`  
p:n^c5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &ZFAUE,[  
{ :s985sEv  
 BOOL bRemoved=FALSE; [ :(M<u`y>  
 for(int index=0;index<MAX_KEY;index++){ 1OwkLy,P  
  if(hCallWnd[index]==hWnd){ X#C7r@H  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ i'LTKj  
    hCallWnd[index]=NULL; e<wj5:M|  
    HotKey[index]=0; +s 0Bt '  
    HotKeyMask[index]=0; u5|e9(J  
    bRemoved=TRUE; ^i k|l=  
    KeyCount--; ~(E8~)f)  
    break; f9bz:_;W_  
   } S#z8H+'  
  } L|'ME| '  
 } 9&FV =}MO  
 return bRemoved; ,TA [el%#  
} j`pR;XL1[  
i*E`<9  
void VerifyWindow() ee?ZkU#@  
{ %*; 8m'  
 for(int i=0;i<MAX_KEY;i++){ -L<Pm(v&  
  if(hCallWnd!=NULL){ hWe}(Ks  
   if(!IsWindow(hCallWnd)){ L#N.pd  
    hCallWnd=NULL; KPcuGJ  
    HotKey=0; r6_a%A*  
    HotKeyMask=0; =_:L wmI  
    KeyCount--; 6M|%nBN$|  
   } (:muxby%  
  } tB?S0;yXjd  
 } :QSW^x  
} uzA'D~)P  
K:Go%3~,  
BOOL CHookApp::InitInstance() *F&&rsb  
{ +Y[+2=lO  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0'}?3/u-  
 hins=AfxGetInstanceHandle(); E%:zE Q  
 InitHotkey(); NX",e=  
 return CWinApp::InitInstance(); !\ukb  
} 6-YR'ikU  
Vb#@o)z  
int CHookApp::ExitInstance() R?Q-@N>wE  
{ AWNd(B2o  
 VerifyWindow(); G{Q'N04RA  
 UnInit(); <LZvh8  
 return CWinApp::ExitInstance(); mR@Xt#  
} ]V("^.~$+C  
D/`E!6Fk=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 8{<cqYCR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 1uQf}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H)+kN'J  
#if _MSC_VER > 1000 m%\[1|N  
#pragma once R/YL1s  
#endif // _MSC_VER > 1000 [SvwJIJJ  
]}l!L;  
class CCaptureDlg : public CDialog .?j8{>  
{ O{R5<"g  
 // Construction jG :R\D}0  
 public: F'*&-l  
  BOOL bTray; {`zF{AW8q  
  BOOL bRegistered; $O-, :<HY  
  BOOL RegisterHotkey(); { "c,P:S]  
  UCHAR cKey; __c_JU  
  UCHAR cMask; #OTsD+2Za=  
  void DeleteIcon(); YTh4&wm  
  void AddIcon(); eP?|U.on  
  UINT nCount; &Hxr3[+$  
  void SaveBmp(); *p!dd?8  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [DEw:%  
  // Dialog Data mm`3-F|  
  //{{AFX_DATA(CCaptureDlg) Tq8r SZi  
  enum { IDD = IDD_CAPTURE_DIALOG }; N9<eU!4>  
  CComboBox m_Key; lukV G2wDL  
  BOOL m_bControl; #"JU39e  
  BOOL m_bAlt; R<Tzt' z  
  BOOL m_bShift; bb/MnhB  
  CString m_Path; A'EA!  
  CString m_Number; <`qo*__1  
  //}}AFX_DATA .D`#a  
  // ClassWizard generated virtual function overrides o7seGw<$X  
  //{{AFX_VIRTUAL(CCaptureDlg) ,;18:  
 public: w(-n1oSo  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ?Sxnq#r#  
 protected: XQ+hTtP  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -9"Ls?Cu  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |L&V-f&K  
  //}}AFX_VIRTUAL 3MVZ*'1QM\  
  // Implementation I,;)pWX=@  
 protected: )O Cr6UR  
  HICON m_hIcon; t |hmEHUk  
  // Generated message map functions bwFc>{Wo5  
  //{{AFX_MSG(CCaptureDlg) !Ua#smZ  
  virtual BOOL OnInitDialog(); u<zDZ{jt)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u{,^#I}  
  afx_msg void OnPaint(); 0%/(p?]M  
  afx_msg HCURSOR OnQueryDragIcon(); ^D|c  
  virtual void OnCancel(); 5ntP{p%>  
  afx_msg void OnAbout(); zL'n J  
  afx_msg void OnBrowse(); k5YDqG n'q  
  afx_msg void OnChange(); W=m_G]"L  
 //}}AFX_MSG Fu/CX4R_|  
 DECLARE_MESSAGE_MAP() 48`<{|r{  
}; 1<"kN^  
#endif /<Et   
jGCW^#GE  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file cD6o8v4] ]  
#include "stdafx.h" K~>kruO";  
#include "Capture.h" kuaov3Ui  
#include "CaptureDlg.h" =Yk$Q\c  
#include <windowsx.h> {xX|5/z  
#pragma comment(lib,"hook.lib") z-j\S7F  
#ifdef _DEBUG `39U I7  
#define new DEBUG_NEW O.dNhd$  
#undef THIS_FILE /'(P{O>{j  
static char THIS_FILE[] = __FILE__; E=d[pI,e  
#endif (I5ra_FVs  
#define IDM_SHELL WM_USER+1 =l+p nG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Yt^+31/%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6z*L9Vy($  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; qC &<U  
class CAboutDlg : public CDialog $7,dKC &  
{ 3a0C<hW  
 public: );[`rXH_  
  CAboutDlg(); 0&x)5^lG  
  // Dialog Data TxWj gW~  
  //{{AFX_DATA(CAboutDlg) ;`+,gVrp  
  enum { IDD = IDD_ABOUTBOX }; 'Bx7b(xqk  
  //}}AFX_DATA {TNAK%'v  
  // ClassWizard generated virtual function overrides "=;&{N~8U  
  //{{AFX_VIRTUAL(CAboutDlg) ~6nQ-  
 protected: N_0O"" d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GZw<Y+/V"5  
  //}}AFX_VIRTUAL wkGF&U  
  // Implementation ?8 F7BS4oQ  
 protected: Yq_zlxd%F  
  //{{AFX_MSG(CAboutDlg) ;ORy&H aKl  
  //}}AFX_MSG ;V GrZZ  
  DECLARE_MESSAGE_MAP() oCrn  
}; +l9avy+P (  
"n:9JqPb  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) V4H+m,R  
{ @b zrJ 7$  
 //{{AFX_DATA_INIT(CAboutDlg) :FSkXe2yy0  
 //}}AFX_DATA_INIT `dK\VK^  
} '9)@U+yfQ  
WA/\x  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) BhjXNf9[  
{ ^:0?R/A  
 CDialog::DoDataExchange(pDX); `3-j%H2R  
 //{{AFX_DATA_MAP(CAboutDlg) c2nZd.SD|  
 //}}AFX_DATA_MAP >X F@=J p  
} LHz{*`22q  
L8fr uwb  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L0Cf@~k  
 //{{AFX_MSG_MAP(CAboutDlg) /iK )tl|X  
 // No message handlers uP$K{ )  
 //}}AFX_MSG_MAP b<8h\fR#'  
END_MESSAGE_MAP() = 7?'S#  
SXL6)pX  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) pV!(#45~W  
: CDialog(CCaptureDlg::IDD, pParent) 8yo9$~u;  
{ $ ]HIYYs  
 //{{AFX_DATA_INIT(CCaptureDlg) Du/s  
  m_bControl = FALSE;  0c{N)  
  m_bAlt = FALSE; Km?i{TW  
  m_bShift = FALSE; ICi- iX  
  m_Path = _T("c:\\"); DF~w20+  
  m_Number = _T("0 picture captured."); NXx}KF c  
  nCount=0; +Il=gL1  
  bRegistered=FALSE; G\ofg  
  bTray=FALSE; + y^s 6j}  
 //}}AFX_DATA_INIT oAL-v428  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ^:],JN k  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P7o6B,9  
} F ;D_zo?  
%>.v[d1c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) bQ)r8[o!  
{ "@n$(-.  
 CDialog::DoDataExchange(pDX); qH ~usgqB7  
 //{{AFX_DATA_MAP(CCaptureDlg) bchhokH   
  DDX_Control(pDX, IDC_KEY, m_Key); Di6:r3sEO  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); iY2bRXA  
  DDX_Check(pDX, IDC_ALT, m_bAlt); DXUI/C f  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); c2C8}XJ|O  
  DDX_Text(pDX, IDC_PATH, m_Path); g#AA.@/Z  
  DDX_Text(pDX, IDC_NUMBER, m_Number); rT#QA=YB  
 //}}AFX_DATA_MAP | ] YT6-?.  
} (xTHin$  
$Z j.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) EPI*~=Z.U  
//{{AFX_MSG_MAP(CCaptureDlg) q=bXHtU  
 ON_WM_SYSCOMMAND() *8N~ Zmz  
 ON_WM_PAINT() Oe273Y^e  
 ON_WM_QUERYDRAGICON() "FU|I1Xz  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) E.}Zmr#H  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $W09nz9?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) li{_biey}  
//}}AFX_MSG_MAP y8L:nnSj  
END_MESSAGE_MAP() 7XY C.g  
YJ9_cA'A  
BOOL CCaptureDlg::OnInitDialog() 5E@V@kw  
{ qg O)@B+  
 CDialog::OnInitDialog(); ofSOy1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6f?DW-)jp/  
 ASSERT(IDM_ABOUTBOX < 0xF000); `{/=i|6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); z23KSPo  
 if (pSysMenu != NULL) yH`xk%q_  
 { SXT/9FteZ  
  CString strAboutMenu; N 8OPeY  
  strAboutMenu.LoadString(IDS_ABOUTBOX); UY+~xzm  
  if (!strAboutMenu.IsEmpty()) /b*@dy  
  { kC+A7k6  
   pSysMenu->AppendMenu(MF_SEPARATOR); X;1q1X)K  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;2iZX=P`n  
  } $5A XE;~{  
 } vfjIpg%i  
 SetIcon(m_hIcon, TRUE); // Set big icon L?P8/]DGp  
 SetIcon(m_hIcon, FALSE); // Set small icon Zy#r<j]T  
 m_Key.SetCurSel(0); ]-6 G'i?  
 RegisterHotkey(); Li'T{0)1)  
 CMenu* pMenu=GetSystemMenu(FALSE); <.<Nw6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >GcFk&x  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); x6,RW],FGR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V7^?jck  
 return TRUE; // return TRUE unless you set the focus to a control NE! Xt<A  
} +)Ty^;+[1  
YT_kMy>  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &F:7U!  
{ f`cz @  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 3.jwOFH$  
 { LD NpEX~  
  CAboutDlg dlgAbout; OYKV*  
  dlgAbout.DoModal(); ]}B&-Yp  
 } i et|\4A  
 else +Lyh F2  
 { B|Omz:c  
  CDialog::OnSysCommand(nID, lParam); jfWIPN  
 } pZR^ HOq  
} ^R\blJQ<^  
4?&=H *H:  
void CCaptureDlg::OnPaint() OT[t EqQ  
{ /i"EVN`t  
 if (IsIconic()) sq^,l6es>  
 { A@#dv2JzP  
  CPaintDC dc(this); // device context for painting 0'~ ?u'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); M$GD8|*e  
  // Center icon in client rectangle Dn@ n:m  
  int cxIcon = GetSystemMetrics(SM_CXICON); VcP#/&B|  
  int cyIcon = GetSystemMetrics(SM_CYICON); l9Vim9R5T  
  CRect rect; Ax\Fg 5  
  GetClientRect(&rect); %cv%u6 b  
  int x = (rect.Width() - cxIcon + 1) / 2; 5 9X|l&/  
  int y = (rect.Height() - cyIcon + 1) / 2; -LY_7Kg  
  // Draw the icon ^TjFR*S'E  
  dc.DrawIcon(x, y, m_hIcon); <omz9d1  
 } ks{s Q@~  
 else \kRBJ1)|f  
 { 6y0C  
  CDialog::OnPaint(); GwvxX&P  
 } YK-R|z6K  
} &sRyM'XI  
qq/Cn4fN8  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1Tl("XV3  
{ MVCCh+,GI  
 return (HCURSOR) m_hIcon; C+iP @~  
} 9GEcs(A*  
X4TUi8ht!]  
void CCaptureDlg::OnCancel() 4e(@b3y  
{ Uag1vW,c  
 if(bTray) oacY-&  
  DeleteIcon(); F7hQNQu:  
  CDialog::OnCancel(); 0uvL,hF  
} sPw(+m*C   
jlB3BwG{w  
void CCaptureDlg::OnAbout() ^KlOD_GN|  
{ h~1QmEat  
 CAboutDlg dlg; aT0 y  
 dlg.DoModal(); k"U4E J{  
} 3ZVfZf  
;~K($_#H  
void CCaptureDlg::OnBrowse() l>]M^=,&7  
{ @!S$gTz  
 CString str; EAI[J&c  
 BROWSEINFO bi; +2g3%c0}  
 char name[MAX_PATH]; WZMsmhU@T  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); iO@wqbg$6  
 bi.hwndOwner=GetSafeHwnd(); ^Nu} HcC+  
 bi.pszDisplayName=name; (UM+?]Qwy  
 bi.lpszTitle="Select folder"; #i,O "`4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; v:>P;\]r9M  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); "gO5dZ\0  
 if(idl==NULL) ?{2-,M0  
  return; M{H&5 9v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); -7`J(f.rYC  
 str.ReleaseBuffer(); 4{R`  
 m_Path=str; n5 i}J/Sa2  
 if(str.GetAt(str.GetLength()-1)!='\\') k8ck#%#}Wu  
  m_Path+="\\"; 0 QpWt  
 UpdateData(FALSE); Z/x1?{z  
} yx-"YV}5  
-"<f(  
void CCaptureDlg::SaveBmp() V1fPH;  
{ B8&@Qc@~  
 CDC dc; okv7@8U#p  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~!;3W!@(E  
 CBitmap bm; S6QG:|#P  
 int Width=GetSystemMetrics(SM_CXSCREEN); mvw:E_  
 int Height=GetSystemMetrics(SM_CYSCREEN); j oG>=o  
 bm.CreateCompatibleBitmap(&dc,Width,Height); NplSkv  
 CDC tdc; !9 F+uc5  
 tdc.CreateCompatibleDC(&dc); 9p.>L8  
 CBitmap*pOld=tdc.SelectObject(&bm); f[RnL#*xJU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <ZiO[dEV  
 tdc.SelectObject(pOld); h(L5MZs  
 BITMAP btm; 9+:Trc\%N  
 bm.GetBitmap(&btm); "f3>20}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; H1]\B:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @^e@.)  
 BITMAPINFOHEADER bih; :uEp7Y4  
 bih.biBitCount=btm.bmBitsPixel; pIXQ/(h31  
 bih.biClrImportant=0; ox6rR  
 bih.biClrUsed=0; .DQ]q o]OG  
 bih.biCompression=0; ^#o.WL%4/B  
 bih.biHeight=btm.bmHeight; u *< (B  
 bih.biPlanes=1; ?Y9?x,x  
 bih.biSize=sizeof(BITMAPINFOHEADER); QKO(8D6+  
 bih.biSizeImage=size; I%Awj(9BS  
 bih.biWidth=btm.bmWidth; qha<.Ro  
 bih.biXPelsPerMeter=0; H,}?YW  
 bih.biYPelsPerMeter=0; liTr3T`,V  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); I?"5i8E  
 static int filecount=0; 9V&LJhDQ  
 CString name; N9Ml&*%oX{  
 name.Format("pict%04d.bmp",filecount++); [h1{{Nb#ez  
 name=m_Path+name; sF$m?/Kt  
 BITMAPFILEHEADER bfh; D4\I;M^  
 bfh.bfReserved1=bfh.bfReserved2=0; :q=OW1^k^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); - \QtE}|4  
 bfh.bfSize=54+size; OK 6}9Eu9  
 bfh.bfOffBits=54; pr"flRQr#  
 CFile bf; 0TpA3K  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8`2K=`]ES+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ;W].j%]L e  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); CmTJa5:  
  bf.WriteHuge(lpData,size); =N c`hP  
  bf.Close(); ;vitg"Zh>  
  nCount++; ~iWSc8-  
 } D\R^*k@V  
 GlobalFreePtr(lpData); #vSI_rt9I  
 if(nCount==1) Ce:ds%  
  m_Number.Format("%d picture captured.",nCount); <Va>5R_d<  
 else ( ~>Q2DS  
  m_Number.Format("%d pictures captured.",nCount); T!PX?  
  UpdateData(FALSE); msylb~^  
} wu')Q/v  
d%hA~E1rR  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) m 5Kx}H~  
{ Mx"tUoU6z  
 if(pMsg -> message == WM_KEYDOWN) MF`'r#@:wa  
 { yKJ^hv"#  
  if(pMsg -> wParam == VK_ESCAPE) N,|oV|i  
   return TRUE; U4gwxK  
  if(pMsg -> wParam == VK_RETURN) EMG*8HRI>r  
   return TRUE; ;j=1 oW  
 } -+> am?  
 return CDialog::PreTranslateMessage(pMsg); u i1m+  
} RHbwq]  
w.f [)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9YABr> ?  
{ \4k*Zk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ wNZ7(W.U  
  SaveBmp(); i"xDQ$0G6  
  return FALSE; %a `dO EO  
} k:Q<Uanc[  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3:Wr)>l}#  
 CMenu pop; gwJu&HA/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I>a a'em  
 CMenu*pMenu=pop.GetSubMenu(0); Y>~JI;Cu`  
 pMenu->SetDefaultItem(ID_EXITICON); Q_.Fw\l$`  
 CPoint pt; P{18crC[1  
 GetCursorPos(&pt); DF2&j!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Ysu/7o4  
 if(id==ID_EXITICON) 5ov%(QI  
  DeleteIcon(); :(Bi {cw  
 else if(id==ID_EXIT) ^~l<N@  
  OnCancel(); =6&D4~R  
 return FALSE; [2V/v  
} I.!/R`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); V-jL`(JF%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u#~! %~  
 AddIcon(); ?miM15XI  
 return res; RZA\-?cO)  
} @k<~`S~|  
sjm79/  
void CCaptureDlg::AddIcon() W+?[SnHL/  
{ 9DX3]Z\7X  
 NOTIFYICONDATA data; G,*s9P]1  
 data.cbSize=sizeof(NOTIFYICONDATA); ISew]R2  
 CString tip; 7`HUwu  
 tip.LoadString(IDS_ICONTIP); /&7Yi_]r  
 data.hIcon=GetIcon(0); #LJ-IDuF!  
 data.hWnd=GetSafeHwnd(); Ck?:8YlF  
 strcpy(data.szTip,tip); 'OCo1|iK~  
 data.uCallbackMessage=IDM_SHELL; ->=++  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; J-F_XKqH  
 data.uID=98; kB#vh  
 Shell_NotifyIcon(NIM_ADD,&data); bl_WN|SQ  
 ShowWindow(SW_HIDE); ^ {f ^WL=  
 bTray=TRUE; zi .,?Q  
} 0(x@ NGb>{  
-^v}T/Kl#  
void CCaptureDlg::DeleteIcon() (p=GR#  
{ R"`{E,yj  
 NOTIFYICONDATA data; :'~ gLW>j  
 data.cbSize=sizeof(NOTIFYICONDATA); "b4iOp&:=  
 data.hWnd=GetSafeHwnd(); (L%q/$  
 data.uID=98; u V7Hsg9l  
 Shell_NotifyIcon(NIM_DELETE,&data); tYZGf xj  
 ShowWindow(SW_SHOW); <9a_wGs  
 SetForegroundWindow(); :n9~H+!  
 ShowWindow(SW_SHOWNORMAL); bK9~C" k  
 bTray=FALSE; C)s1' =TZ  
} GK?R76d  
pIiED9  
void CCaptureDlg::OnChange() +z0}{,HX  
{ : "te-  
 RegisterHotkey(); 9PK-r;2  
} \/'n[3x  
=pyZ^/}P  
BOOL CCaptureDlg::RegisterHotkey() u 7Y< ~  
{ 2-!Mao"^  
 UpdateData(); &>.1%x@R  
 UCHAR mask=0; @;D}=$x  
 UCHAR key=0; :b*`hWnQ  
 if(m_bControl) KxmPL  
  mask|=4; fMPq  
 if(m_bAlt) Q0Qm0B5eY  
  mask|=2; ?^ezEpW  
 if(m_bShift) `sy &dyM  
  mask|=1; FNCLGAiZ  
  key=Key_Table[m_Key.GetCurSel()]; UQ])QTrZFi  
 if(bRegistered){ zB" `i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); EZQ+HECpK  
  bRegistered=FALSE; ~PW}sN6ppG  
 } iCRw}[[  
 cMask=mask; '8kjTf#g<l  
 cKey=key; Sx9:$"3.X  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); I{e^,oc  
 return bRegistered; vr;Br-8  
} .y9rM{h}b  
fhIj+/{_O  
  四、小结 }lUpC}aq_  
XqS*;Zj0  
  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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