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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: b^WF R   
  b*<Fi#x1=  
  一、实现方法 =4LyE6  
Ex4)R2c*  
  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: bs?&;R.5  
2;`WI:nt  
#pragma data_seg("shareddata") DQ%(X&k  
HHOOK hHook =NULL; //钩子句柄 5@`dKFB5  
UINT nHookCount =0; //挂接的程序数目 $Sc;  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *m:'~\[u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `W'S'?$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m4RiF  
static int KeyCount =0; :zsMkdU  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `f\+aD'u  
#pragma data_seg() ,*g.?q@W2  
O*m9qF<  
  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。 #EIcP=1m4  
fU ^5Dl  
  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: TS@U0Ror  
iKAqM{(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR FUs57 V  
cKey,UCHAR cMask) PQ(/1v   
{ t^8|t(Lq  
 BOOL bAdded=FALSE; "hLm wz|a  
 for(int index=0;index<MAX_KEY;index++){ ~otV'=/my  
  if(hCallWnd[index]==0){ `2@f=$B  
   hCallWnd[index]=hWnd; 0"DS>:Ntk  
   HotKey[index]=cKey; |!*abc\`(`  
   HotKeyMask[index]=cMask; mjJ/rx{kbw  
   bAdded=TRUE; xOdL ct  
   KeyCount++; &-p!Lg&D  
   break; `l+9g"q  
  } |]tsf /SA  
 } z9ZS& =>  
 return bAdded; t9[%o=N~lD  
} \_AoG8B  
//删除热键 5~=wia  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) V5S6?V \  
{ CzG/=#IU  
 BOOL bRemoved=FALSE; G'WbXX  
 for(int index=0;index<MAX_KEY;index++){ AJ)N?s-=  
  if(hCallWnd[index]==hWnd){ 'Jl3%axR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ C&&33L  
    hCallWnd[index]=NULL; /[UuHU5*R  
    HotKey[index]=0; Rj~y#m  
    HotKeyMask[index]=0; jP"yG#  
    bRemoved=TRUE; Zl{ DqC^  
    KeyCount--; apv"s+  
    break; Sbjc8V ut  
   } PAs.T4Av^  
  } ZG1 {"J/z  
 } 2GJp`2(%dA  
 return bRemoved; AqjEz+TVt  
} y.?Q  
ANXN.V  
2>Sr04Pt  
  DLL中的钩子函数如下: n-:n.JX  
d?>pcT)G_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !sav~dB)  
{ ?D=t:=  
 BOOL bProcessed=FALSE; )/uCdSDIc  
 if(HC_ACTION==nCode) 2[5z6oG  
 { trM)&aQto  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ./Wi(p{F  
   switch(wParam) <*5`TE0J  
   {  yI8 /m|  
    case VK_MENU: mM-7 j z  
     MaskBits&=~ALTBIT; T*zy^we  
     break; Zksow}%  
    case VK_CONTROL: <<+Hs/ ]  
     MaskBits&=~CTRLBIT; bXK$H=S Bz  
     break; *sq+ Vc(  
    case VK_SHIFT: UszR. Z  
     MaskBits&=~SHIFTBIT; +3k#M[Bn}  
     break; wPH1g*U  
    default: //judge the key and send message 5c-'m? k  
     break; 4Q^i"jT  
   } <77v8=as5  
   for(int index=0;index<MAX_KEY;index++){ ,=y8[(h  
    if(hCallWnd[index]==NULL) UjH+BC+9`b  
     continue; <R8!fc{`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lBfG#\rdW~  
    { J]qx4c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $jL+15^N0+  
     bProcessed=TRUE; ~A-VgBbU>_  
    } ~+Ows  
   } l5,}yTUta  
  } bb"x^DtT  
  else if((lParam&0xc000ffff)==1){ //有键按下 _`q ei0  
   switch(wParam) @-Ln* 3n  
   { <PXnR\  
    case VK_MENU: 5vjtF4}7!  
     MaskBits|=ALTBIT; xZp`Ke!  
     break; #(d /A<  
    case VK_CONTROL: j8{,u6w)-  
     MaskBits|=CTRLBIT; CO.e.:h  
     break; {b90c'8?a  
    case VK_SHIFT: #{suH7  
     MaskBits|=SHIFTBIT; 8ubb~B;  
     break; :qO)^~x  
    default: //judge the key and send message =.f<"P51k  
     break; )}5f'TK  
   } O - N> X  
   for(int index=0;index<MAX_KEY;index++){ =-8y =  
    if(hCallWnd[index]==NULL) 5.FAuzz  
     continue; {^SHIL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !-Md+I_  
    { n<66 7 <  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,: 4+hJ<q  
     bProcessed=TRUE; C}cYG  
    } MU5#ph  
   } 0O7VM)[  
  } il >XV>  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 rklK=W z  
   for(int index=0;index<MAX_KEY;index++){ ^%2S,3*0  
    if(hCallWnd[index]==NULL) L+ d4&x  
     continue; A_<1}8{L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q^\f,E\S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :H`Z.>K  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]>k>Z#8E*  
   } 7="I;  
  } J-+p]xG  
 } /d]{ #,k  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); `=rDB7!$yL  
} Q>[GD(8k  
D}7G|gX1  
  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: g)#.|d+  
Y#aHGZ$i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YztW1GvI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c;1Xu1  
)Qx&m}  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: X1; ljX  
?&GV~DYxA  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !L\P.FP7b  
{ UA$Xa1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &?j]L4%  
 { $Y31Y A  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 pG9qD2C f  
  SaveBmp(); \,G7nT  
  return FALSE; wf=M| #}_  
 } 3rQ;}<*M  
 …… //其它处理及默认处理 CXfPC[o  
} 3QO*1P@q  
 -p2 =?a  
f+j-M|A  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 (D rDWD4_  
3# r` e  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 R=u!Rcv R  
<zE~N~;  
  二、编程步骤 C'Z6l^{>  
l Vc':,z  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 0R[onPU_vZ  
)k'4]=d <  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |FrZ,(\  
E A}Vb(2  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; b\H !\A  
hh ynB^o  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; +_E 96`P  
Mk$Pt  
  5、 添加代码,编译运行程序。 %K|+4ZY3  
vaOCH*}h  
三、程序代码 >Lr ud{  
Y<oDv`a Z0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL HtbN7V/  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <764|q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Q]oCzSi  
#if _MSC_VER > 1000 e#j kp'  
#pragma once FfR%@ V'  
#endif // _MSC_VER > 1000 '}eA2Q>BV  
#ifndef __AFXWIN_H__ S((\KL,  
#error include 'stdafx.h' before including this file for PCH yQ M<(;\O  
#endif Da8{==  
#include "resource.h" // main symbols FeAMt  
class CHookApp : public CWinApp =h se2f  
{ KOM]7%ys1H  
 public: skR I \  
  CHookApp(); #:6gFfk0<  
  // Overrides Kx@;LRY#  
  // ClassWizard generated virtual function overrides 4+j:]poYG{  
  //{{AFX_VIRTUAL(CHookApp) SF2<   
 public: L-\o zp  
  virtual BOOL InitInstance(); 1ZK~i  
  virtual int ExitInstance(); BPkqC>w  
  //}}AFX_VIRTUAL C].w)B  
  //{{AFX_MSG(CHookApp) n:d7 Tv1Z8  
  // NOTE - the ClassWizard will add and remove member functions here. z3X:.%  
  // DO NOT EDIT what you see in these blocks of generated code ! qwx{U  
  //}}AFX_MSG ^~:&/0  
  DECLARE_MESSAGE_MAP() Y;[#~3CA  
}; #O2e[ E-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !-gjA@Pk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W n43TSs-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a="\?L5  
BOOL InitHotkey(); 4RYvI!  
BOOL UnInit(); ,V}Vxq3  
#endif .*>pD/  
G8E=E<Yg~  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. r=o\!sh[  
#include "stdafx.h" +f- E8q  
#include "hook.h" Lj(y>{y  
#include <windowsx.h> ]fgYO+  
#ifdef _DEBUG Hg}@2n)/  
#define new DEBUG_NEW h-`*S&mZ  
#undef THIS_FILE WOaj_o  
static char THIS_FILE[] = __FILE__; !WD~zZ|  
#endif gQ@fe3[  
#define MAX_KEY 100 g9$P J:  
#define CTRLBIT 0x04 hy?e?^  
#define ALTBIT 0x02 kbF+aS  
#define SHIFTBIT 0x01 E:C-k^/[Y  
#pragma data_seg("shareddata") lq%6~va  
HHOOK hHook =NULL; YPY'[j(p`n  
UINT nHookCount =0; _g#v*7o2@  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey iB=v >8l%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <h"*"q|9  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |Q _]+[  
static int KeyCount =0; lh?TEQ  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift r{~@hd'Aj  
#pragma data_seg() 4H\+vJPM  
HINSTANCE hins; H LnizE  
void VerifyWindow(); (2vf <x  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) lx!9KQAM*  
//{{AFX_MSG_MAP(CHookApp) &InMI#0mV  
// NOTE - the ClassWizard will add and remove mapping macros here. 9 yE   
// DO NOT EDIT what you see in these blocks of generated code! gU^2;C  
//}}AFX_MSG_MAP u(`,7 o "  
END_MESSAGE_MAP() Ea7LPHE#  
4xE [S  
CHookApp::CHookApp() 7P2?SW^  
{ +UTs2*H/^  
 // TODO: add construction code here, u3>D vl@  
 // Place all significant initialization in InitInstance ?TXe.h|u  
} V9"?}cR/W;  
%bs~%6)  
CHookApp theApp; gqi|k6V/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 5U3 b&0  
{ QNzx(IV@  
 BOOL bProcessed=FALSE; JZS#Q\JN  
 if(HC_ACTION==nCode) %`~? w'  
 {  HSR^R  
  if((lParam&0xc0000000)==0xc0000000){// Key up ayb fBC  
   switch(wParam) Dm.tYG  
   { u0vq`5L  
    case VK_MENU: MiX*PqNTM  
     MaskBits&=~ALTBIT; ct3^V M&/  
     break; )G">7cg;t  
    case VK_CONTROL: $M(ZKS3,j  
     MaskBits&=~CTRLBIT; R3dCw:\O+Z  
     break; %HNe"7gk  
    case VK_SHIFT: = +=k(*  
     MaskBits&=~SHIFTBIT; vV?=r5j  
     break; #q5 L4uM9  
    default: //judge the key and send message 3~%wA(|A  
     break; ?l3PDorR  
   } sBo|e]m#  
   for(int index=0;index<MAX_KEY;index++){ pM^r8kIH  
    if(hCallWnd[index]==NULL) 6,*o;<k[  
     continue; iB:](Md'r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kZsat4r  
    { }8W5m(Zq9n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @sV6g?{tI  
     bProcessed=TRUE; 9mT;> mE  
    } =[ $zR>o*%  
   } A+N%A] 2  
  } H#LlxD)q  
  else if((lParam&0xc000ffff)==1){ //Key down (Es0n$Xb  
   switch(wParam) N>'T"^S/  
   { !M[a/7x,p  
    case VK_MENU: ;U^7 ]JO;  
     MaskBits|=ALTBIT; 5ecAev^1-  
     break; Y`x54_32  
    case VK_CONTROL: 9? #pqw  
     MaskBits|=CTRLBIT; jo-qP4w  
     break; v$H]=y  
    case VK_SHIFT: 3%JPJuNVw  
     MaskBits|=SHIFTBIT; m R3km1T  
     break; 7|"gMw/  
    default: //judge the key and send message @\=% M^bx  
     break; HZ#<+~J  
   } f_&bwfbo  
   for(int index=0;index<MAX_KEY;index++) 8u401ddg  
   { 0PK*ULwSN  
    if(hCallWnd[index]==NULL) 3r)<:4a u&  
     continue; % e@Jc 3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !/6`< eQ `  
    { t&r-;sH^[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TzCNY@y  
     bProcessed=TRUE; m),3J4(q  
    } #_, l7q8U  
   } *W#_W]Tu  
  } AvN\^ &G  
  if(!bProcessed){ FE`:1  
   for(int index=0;index<MAX_KEY;index++){ fFHT`"bD:  
    if(hCallWnd[index]==NULL) },2mIit(  
     continue; } h.]sF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Rw54`_kFEB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <oE(I)r4,  
   } UY_'F5X  
  } pm*6&,  
 } +{$NN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d`z),A=  
} &s|&cT  
?W%9H\;  
BOOL InitHotkey() %U.aRSf/  
{  {ws:g![  
 if(hHook!=NULL){ gX}(6RP_!  
  nHookCount++; Y+k)d^6r  
  return TRUE; &wlSOC')j  
 } )_bR"!Z  
 else i_? S#L]h  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O;N QJ$^bI  
  if(hHook!=NULL) M``I5r*cg  
   nHookCount++; CywQ  
  return (hHook!=NULL); 6NO_S  
} W6&s_ (  
BOOL UnInit() DL^}?Ve  
{ 6o_t;cpT  
 if(nHookCount>1){ ]"3(UKx  
  nHookCount--; @bN`+DC!<  
  return TRUE; H$ !78/f  
 } fNVNx~E  
 BOOL unhooked = UnhookWindowsHookEx(hHook); O6LuFT .  
 if(unhooked==TRUE){ #'qEm=%  
  nHookCount=0; f?iQ0wv)  
  hHook=NULL; fE\;Cbi  
 } UqaLTdYG  
 return unhooked; %n3lm(-0U  
} Lh%>> Ht{  
![wV}. }  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z;dD }Fo  
{ PD$g W`V  
 BOOL bAdded=FALSE; s uT#k3  
 for(int index=0;index<MAX_KEY;index++){ ?#8s=t  
  if(hCallWnd[index]==0){ 'g8~uP  
   hCallWnd[index]=hWnd; (z}q6Lfa  
   HotKey[index]=cKey; ~*|0yPFg  
   HotKeyMask[index]=cMask; >f [Lb|t  
   bAdded=TRUE;  )"im|9  
   KeyCount++; L}bS"=B[&W  
   break; ?jywW$   
  } !+?,y/*5(  
 } ,FvBZ.4c3=  
 return bAdded; IH;+pN  
} AXV+8$ :R  
-Mb`I >=  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z@lUaMm:F  
{ R "S,&  
 BOOL bRemoved=FALSE; ~aK@M4  
 for(int index=0;index<MAX_KEY;index++){ A9_)}  
  if(hCallWnd[index]==hWnd){ 3Z *'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;:JTb2xbb  
    hCallWnd[index]=NULL; v2>.+Eh#  
    HotKey[index]=0; 5I!EsW$sY  
    HotKeyMask[index]=0; SBBDlr^P  
    bRemoved=TRUE; 87P.K Yy  
    KeyCount--; e}u# :ysj  
    break; \0'7p-T6  
   } zV(F9}^  
  } /dU-$}>ZI  
 } aZ%  
 return bRemoved; o2cZ  
} o}XbFL n  
b(lC7Xm  
void VerifyWindow() |OXufV?I  
{ 5B [kZ?>  
 for(int i=0;i<MAX_KEY;i++){ a'f0Wv0%"  
  if(hCallWnd!=NULL){ *5DOTWos  
   if(!IsWindow(hCallWnd)){ [p%@ pV  
    hCallWnd=NULL; MLV_I4o  
    HotKey=0; <$WRc\}&g  
    HotKeyMask=0; Cd:ofv/3  
    KeyCount--; tBNkVh(c  
   } %Lec\(-4L  
  } $a|DR  
 } 6e1/h@p\7  
} %4:tRF  
7/.-dfEK  
BOOL CHookApp::InitInstance() u:+wuyu  
{ eMPk k=V  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); gl/n*s#r_  
 hins=AfxGetInstanceHandle(); *5$$C&@o9  
 InitHotkey(); S ^?&a5{o  
 return CWinApp::InitInstance(); 8y!d^EQ  
} 0*66m:C2  
KmoPFlw  
int CHookApp::ExitInstance() @\,WJmW  
{ V j\1 HQ  
 VerifyWindow(); .6Swc?  
 UnInit(); >b>3M'  
 return CWinApp::ExitInstance(); ='1J&w~7  
} |];s[^$#  
-1ke3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file y6|&bJ @  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) T<*i($ [  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~Uw **PT3M  
#if _MSC_VER > 1000 (>*<<a22  
#pragma once JO:40V?op  
#endif // _MSC_VER > 1000 zmf`}j[  
5}3Q}o#  
class CCaptureDlg : public CDialog U[\aj;g)  
{ 73?ZB+\)0A  
 // Construction =F2e*?a3  
 public: FL 5u68  
  BOOL bTray; k'uN2m  
  BOOL bRegistered; 4&IBNc,sn  
  BOOL RegisterHotkey(); vmI]N  
  UCHAR cKey; 4e d+'-"m  
  UCHAR cMask; @,i_ KN6C  
  void DeleteIcon(); yBKkx@o#z  
  void AddIcon(); M IPmsEdBi  
  UINT nCount; Fy N@mX  
  void SaveBmp(); *bu/Ko]  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0Zkb}F2-  
  // Dialog Data 45l/)=@@B  
  //{{AFX_DATA(CCaptureDlg) BJDe1W3;'  
  enum { IDD = IDD_CAPTURE_DIALOG }; yW.s?3X  
  CComboBox m_Key; T"Ph@I<  
  BOOL m_bControl; $\>GQ~k  
  BOOL m_bAlt; p:u?a,p  
  BOOL m_bShift; S/CT;M@W  
  CString m_Path; M$L1!o1Xf  
  CString m_Number; ^g`1SU`  
  //}}AFX_DATA SGn:f>N  
  // ClassWizard generated virtual function overrides JF]HkH_u  
  //{{AFX_VIRTUAL(CCaptureDlg) L*tn>AO  
 public: mBgMu@zt)  
  virtual BOOL PreTranslateMessage(MSG* pMsg); }PGl8F !  
 protected: D\8~3S'd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support is`Eqcj`dr  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); iQpKcBx  
  //}}AFX_VIRTUAL (l : ;p&[  
  // Implementation }0c  
 protected:  Ex35  
  HICON m_hIcon; Wbc*x  
  // Generated message map functions /X)fWO S6  
  //{{AFX_MSG(CCaptureDlg) Hk%m`|Z  
  virtual BOOL OnInitDialog(); O.S(H1z<G  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); VJ P]Jy_  
  afx_msg void OnPaint(); jJ-j   
  afx_msg HCURSOR OnQueryDragIcon(); b@@`2O3"  
  virtual void OnCancel(); 6R% I)  
  afx_msg void OnAbout(); X_XeI!,b  
  afx_msg void OnBrowse(); UX=JWb_uGm  
  afx_msg void OnChange(); 'S<ebwRd=  
 //}}AFX_MSG TfK$tTkM  
 DECLARE_MESSAGE_MAP() N?0T3-/K  
}; 5!,`LM9  
#endif w@Ut[ ;6^  
- 8&M^-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vsg"!y@v  
#include "stdafx.h" 4;8 Z?.  
#include "Capture.h" C#X|U2$  
#include "CaptureDlg.h" /m%Y.:g  
#include <windowsx.h> 1cWUPVQ  
#pragma comment(lib,"hook.lib") jLc4D'  
#ifdef _DEBUG XPE{]4 g  
#define new DEBUG_NEW */ZrZ^?o  
#undef THIS_FILE U.UN=uv_  
static char THIS_FILE[] = __FILE__; 2'W3:   
#endif a%DnRkRr  
#define IDM_SHELL WM_USER+1 D]resk  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5=/H2T!F  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i[A$K~f  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; e>1z1Q;_uv  
class CAboutDlg : public CDialog 7u-o7#,X2  
{ !Q =H)\3  
 public: \gy39xoW(  
  CAboutDlg(); pA9^-:\*  
  // Dialog Data h{I)^8,M  
  //{{AFX_DATA(CAboutDlg) ve_TpP  
  enum { IDD = IDD_ABOUTBOX }; U bT7  
  //}}AFX_DATA KOVGwEj  
  // ClassWizard generated virtual function overrides 2:^Dv1J)rD  
  //{{AFX_VIRTUAL(CAboutDlg) n8#iL  
 protected: HkFoyy  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !Z2?dhS  
  //}}AFX_VIRTUAL :Zl@4}  
  // Implementation `qp[x%7^  
 protected: sEq_K#n{  
  //{{AFX_MSG(CAboutDlg) !T02@e/  
  //}}AFX_MSG 4v cUHa|4  
  DECLARE_MESSAGE_MAP() DE:FWD<}  
}; _n(O?M&x  
'ek7e.x|V  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) EQXvEJ^  
{ l[mXbQd  
 //{{AFX_DATA_INIT(CAboutDlg) B/g.bh~)q  
 //}}AFX_DATA_INIT wYK-YY:Q3  
} }-9  
smW 7zGE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) V9f$zjpw  
{ _v:t$k#sN  
 CDialog::DoDataExchange(pDX); |T0jq  
 //{{AFX_DATA_MAP(CAboutDlg) ZAVjq;bq  
 //}}AFX_DATA_MAP i E>E*!aBg  
} EE5I~k 5  
6VpT*,2d~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^6`"f  
 //{{AFX_MSG_MAP(CAboutDlg) f}b= FV{  
 // No message handlers 21x?TZa  
 //}}AFX_MSG_MAP -Zd0[& ']  
END_MESSAGE_MAP() E'zLgU)r`  
{(#Dou  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -t2bHhG  
: CDialog(CCaptureDlg::IDD, pParent) fF37P8Ir  
{ Z}6   
 //{{AFX_DATA_INIT(CCaptureDlg) :r* skV|  
  m_bControl = FALSE; E!w%oTx{OR  
  m_bAlt = FALSE; jFfuT9oId  
  m_bShift = FALSE; )e`$'y@L$  
  m_Path = _T("c:\\"); =Is.T  
  m_Number = _T("0 picture captured."); v:kTZB  
  nCount=0; ["VUSa  
  bRegistered=FALSE; "HSAwe`5jU  
  bTray=FALSE; A46z2  
 //}}AFX_DATA_INIT [`^5Zb  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 '=}F}[d"kk  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J P'|v"  
} &y"e|aE  
[A99e`  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ib8@U}Vn1  
{ 7xidBVx  
 CDialog::DoDataExchange(pDX); q_K8vGm4e  
 //{{AFX_DATA_MAP(CCaptureDlg) A7,TM&  
  DDX_Control(pDX, IDC_KEY, m_Key); R,?7|x  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); U 1!6%x  
  DDX_Check(pDX, IDC_ALT, m_bAlt); s 8O"U%  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :^7/+|}9p  
  DDX_Text(pDX, IDC_PATH, m_Path); ^"N]i`dIF  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 7jP C{W  
 //}}AFX_DATA_MAP  >sk vg  
} YD1 :m3l!  
X,dOF=OJL  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) iX,| ;J|]  
//{{AFX_MSG_MAP(CCaptureDlg) V*HkF T  
 ON_WM_SYSCOMMAND() w4w[qxV>  
 ON_WM_PAINT() GqB]^snh  
 ON_WM_QUERYDRAGICON() t_cNH@^3<3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !*#2~$:  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) I[u%k ir  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $2N)m:X0  
//}}AFX_MSG_MAP AB92R/  
END_MESSAGE_MAP() HAJK%zLc  
CYD&#+o  
BOOL CCaptureDlg::OnInitDialog() 8wJfG Y  
{ ;G!JKg  
 CDialog::OnInitDialog(); ]Q-*xho  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); CtiTXDc_  
 ASSERT(IDM_ABOUTBOX < 0xF000); uEqL Dg  
 CMenu* pSysMenu = GetSystemMenu(FALSE); c!n\?lB  
 if (pSysMenu != NULL) T 2Uu/^  
 { ghtvAG  
  CString strAboutMenu; stn/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .;#Wf @V  
  if (!strAboutMenu.IsEmpty()) @T>\pP]o  
  { {uVvo=3  
   pSysMenu->AppendMenu(MF_SEPARATOR); LDilrG)  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h8#14?  
  } ft$@':F  
 } 'a8{YT4  
 SetIcon(m_hIcon, TRUE); // Set big icon Fo  K!JX*  
 SetIcon(m_hIcon, FALSE); // Set small icon X.^S@3[  
 m_Key.SetCurSel(0); i> }P V  
 RegisterHotkey(); i}d^a28  
 CMenu* pMenu=GetSystemMenu(FALSE); a'3|EWS ?  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  {*!L[)  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); V}c3}'_U]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); d~#>.$Uu  
 return TRUE; // return TRUE unless you set the focus to a control $J]VY;C!  
} ,ru2C_LQ  
PX7@3Y  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X)P;UVR0  
{ y>4r<Y ZQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1?k{jt~  
 { PL*Mz(&bf  
  CAboutDlg dlgAbout; tCZ3n  
  dlgAbout.DoModal(); c;X8: Z=ja  
 } tkQ#mipAj  
 else SvE3E$*  
 { "9Q @&C  
  CDialog::OnSysCommand(nID, lParam); OUoN  
 } y;oPg4  
} :zN{>,sC  
>iE/t$%1  
void CCaptureDlg::OnPaint() T["(wPrt  
{ 8n_!WDD  
 if (IsIconic()) 954!ED|F(  
 { B{x`^3q R  
  CPaintDC dc(this); // device context for painting tb#9TF  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); LBO3){=J  
  // Center icon in client rectangle cOz8YVR-  
  int cxIcon = GetSystemMetrics(SM_CXICON); yDmNPk/  
  int cyIcon = GetSystemMetrics(SM_CYICON); W@"s~I6  
  CRect rect; Fog4m=b`g  
  GetClientRect(&rect); Y8$Y]2  
  int x = (rect.Width() - cxIcon + 1) / 2; k&TZ   
  int y = (rect.Height() - cyIcon + 1) / 2; q6R``  
  // Draw the icon >ucVrLm,X  
  dc.DrawIcon(x, y, m_hIcon); K+2sq+ 3q  
 } 0^l)9zE  
 else g" c|%3  
 { e+'PRVc  
  CDialog::OnPaint(); zVeQKN9^Z  
 }  Xaz`L  
} =t@8Y`9w  
)Q:.1Hgl  
HCURSOR CCaptureDlg::OnQueryDragIcon() e u{  
{ G3Z>,"w;=  
 return (HCURSOR) m_hIcon; BC*)@=7fx  
} 4gyC?#Ede  
j.}@9  
void CCaptureDlg::OnCancel() |_fmbG  
{ hrT!S  
 if(bTray) hh%f mc  
  DeleteIcon(); pK_n}QW  
  CDialog::OnCancel(); Q:nBx[%  
} #RfNk;kaA  
cJp:0'd  
void CCaptureDlg::OnAbout() 2kG(\+\  
{ '+ %<\.$  
 CAboutDlg dlg; nYA@t=t0  
 dlg.DoModal(); 8:D|[u;iG  
} .k_> BD];  
$C&y-Hnar  
void CCaptureDlg::OnBrowse() H]zi>;D  
{ 6R`q{}.  
 CString str; DL*/hbG  
 BROWSEINFO bi; S9cAw5E(yN  
 char name[MAX_PATH]; )iKV"jsC  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); pv3SAO4  
 bi.hwndOwner=GetSafeHwnd(); /"Z6\T9  
 bi.pszDisplayName=name; |{STkV]  
 bi.lpszTitle="Select folder"; oSAO0h>0N  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Y! 8 I  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 3izGMH_`  
 if(idl==NULL) sN"JVJXi  
  return; Ah_,5Z@&R  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ne!0`^`~  
 str.ReleaseBuffer(); !@.9>"FU  
 m_Path=str; 5*~]=(BE  
 if(str.GetAt(str.GetLength()-1)!='\\') PN(P$6  
  m_Path+="\\"; 7{"urs7 T  
 UpdateData(FALSE); 3zr95$Mt  
} t9C.|6X  
XA1gV>SJ  
void CCaptureDlg::SaveBmp() V"A*k^}  
{ tAi ~i;?  
 CDC dc; N*B_ or  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b$*1!a  
 CBitmap bm; G C#s;X  
 int Width=GetSystemMetrics(SM_CXSCREEN); X npn{  
 int Height=GetSystemMetrics(SM_CYSCREEN); OrG1Mfx&2%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ^9jrI  
 CDC tdc; t_Q\uo}  
 tdc.CreateCompatibleDC(&dc); ~_XK<}SK  
 CBitmap*pOld=tdc.SelectObject(&bm); %U<1]  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &/\Q6$a  
 tdc.SelectObject(pOld); l- mt{2  
 BITMAP btm; F{'lF^Dc  
 bm.GetBitmap(&btm); NKX,[o1  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; be->ofUYgs  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #?3oGrS Y  
 BITMAPINFOHEADER bih; ]cKxYX)J  
 bih.biBitCount=btm.bmBitsPixel; '{-7%>`bn  
 bih.biClrImportant=0; o*r 2T4 8  
 bih.biClrUsed=0; "/#=8_f  
 bih.biCompression=0; .)Wqo7/Gx  
 bih.biHeight=btm.bmHeight; .%x1%TN  
 bih.biPlanes=1; W Z_yaG$U  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3hD\6,@  
 bih.biSizeImage=size; 9w"kxAN  
 bih.biWidth=btm.bmWidth;  mS]&  
 bih.biXPelsPerMeter=0; u]<_6;_  
 bih.biYPelsPerMeter=0; +[lv `tr  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); F<YXkG4 pO  
 static int filecount=0; ||}'  
 CString name; rFJPeK7  
 name.Format("pict%04d.bmp",filecount++); g> <*qd?t  
 name=m_Path+name; izvwXC  
 BITMAPFILEHEADER bfh; ';vL j1v  
 bfh.bfReserved1=bfh.bfReserved2=0; dEvjB"x  
 bfh.bfType=((WORD)('M'<< 8)|'B'); p7Xe[94d^  
 bfh.bfSize=54+size; >[qoNy;  
 bfh.bfOffBits=54; qhQeQ  
 CFile bf; Zr#\>h'c  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ &BZjQK  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); UG,<\k&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); \@eaSa  
  bf.WriteHuge(lpData,size); /=i+7^  
  bf.Close(); />13?o#  
  nCount++; 2 {I(A2  
 } "C~Zl&3  
 GlobalFreePtr(lpData); <J o\RUx  
 if(nCount==1) ],l}J'.8<V  
  m_Number.Format("%d picture captured.",nCount); |z 8Wh  
 else >u0B ~9_E  
  m_Number.Format("%d pictures captured.",nCount); qF? n&>YG  
  UpdateData(FALSE); 6");NHE  
} >OotgJnhC  
Z'cL"n\9R]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) K1oSoD8c  
{ Qw@_.I  
 if(pMsg -> message == WM_KEYDOWN) !\hUjM+(}  
 { bMvHAtp  
  if(pMsg -> wParam == VK_ESCAPE) j96\({;k  
   return TRUE; I%b}qC"5M  
  if(pMsg -> wParam == VK_RETURN) 6E))4 lW  
   return TRUE; 6qF9+r&e ?  
 } '<!T'l:R:/  
 return CDialog::PreTranslateMessage(pMsg); wj$WE3Y  
} Oe_*(q&  
R\MFh!6sn  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gc[BP>tl\  
{ =}xH6^It  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ vd FP ^06  
  SaveBmp(); {+N7o7  
  return FALSE; WW[Gne  
} )d =8)9B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ D"vl$BX  
 CMenu pop; =K8z8K?  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); t \;,$i  
 CMenu*pMenu=pop.GetSubMenu(0); {~0r3N4Zl  
 pMenu->SetDefaultItem(ID_EXITICON); ":Uv u[-  
 CPoint pt; .?NraydwV  
 GetCursorPos(&pt); D6NgdE7b  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #bZT&YE^  
 if(id==ID_EXITICON) YacLYo#  
  DeleteIcon(); ZGgM- O1  
 else if(id==ID_EXIT) P7|x=Ew;`  
  OnCancel(); b!gvvg<  
 return FALSE; T~G~M/  
} tEl_a~s*3?  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); a`E1rK'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) =&-+{txs  
 AddIcon(); iRsK; )<  
 return res; C/{%f,rU  
} %]\IC(q  
@";zM&  
void CCaptureDlg::AddIcon() RS9mAeX4h  
{ 7:P+S%ZL  
 NOTIFYICONDATA data; qf?X:9Wt  
 data.cbSize=sizeof(NOTIFYICONDATA); ;%V)lP"o  
 CString tip; E%np-is{1  
 tip.LoadString(IDS_ICONTIP); sF!nSr  
 data.hIcon=GetIcon(0); 7]pi.1i  
 data.hWnd=GetSafeHwnd(); 7>$&CWI  
 strcpy(data.szTip,tip); f~-Ipq;F  
 data.uCallbackMessage=IDM_SHELL; ]IeyJ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eUZvJTE  
 data.uID=98; Z+M* z;  
 Shell_NotifyIcon(NIM_ADD,&data); N799@:.  
 ShowWindow(SW_HIDE); $^Z ugD  
 bTray=TRUE; oJln"-M1nx  
} dHJ#xmE!pP  
m6iQB\ \  
void CCaptureDlg::DeleteIcon() =ec"G2$?"  
{ d7i 0'R  
 NOTIFYICONDATA data; W,-fnJk  
 data.cbSize=sizeof(NOTIFYICONDATA); TZ>_N;jTZ  
 data.hWnd=GetSafeHwnd(); m0[JiwPI  
 data.uID=98; m)oGeD( !  
 Shell_NotifyIcon(NIM_DELETE,&data); G~FAChI8![  
 ShowWindow(SW_SHOW); sUTfY|<7|  
 SetForegroundWindow(); }MCJ$=5  
 ShowWindow(SW_SHOWNORMAL); Lju)q6  
 bTray=FALSE; x17K8De  
} P8\bi"iiN  
@/ G$ C9<  
void CCaptureDlg::OnChange() )4CF*>*6V  
{ TD6MP9L  
 RegisterHotkey(); s!eB8lkcT  
} 9%6W_ 0>  
%5rC`9^  
BOOL CCaptureDlg::RegisterHotkey() c@<vFoq  
{ _X"G(  
 UpdateData(); Y2 QX9RN  
 UCHAR mask=0; n[tES6u  
 UCHAR key=0; H;k-@J  
 if(m_bControl) 9S! 2r  
  mask|=4; #a|.cm>6  
 if(m_bAlt) '~;vp  
  mask|=2; S :%SarhBD  
 if(m_bShift) na-mh E,H  
  mask|=1; p6|RV(?8  
  key=Key_Table[m_Key.GetCurSel()]; MFqM 6_  
 if(bRegistered){ /KLs+^c5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 9n!IdqKN  
  bRegistered=FALSE; C[IY9s:Pf  
 } k%2Rv4)hU  
 cMask=mask; 2GW.'\D  
 cKey=key; OHyBNJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ^!yJ;'H\  
 return bRegistered; ai@hQJ*  
} l?J|Ip2W  
WIkr0k  
  四、小结 D N#OLk  
V+- ]txu|  
  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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