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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: n$OE~YwP{  
  m_E[bDON  
  一、实现方法 _r<zSH%  
_,Rsl$Tk'  
  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: -e`oW.+  
IB#iJ# ,  
#pragma data_seg("shareddata") 1|l)gfcP  
HHOOK hHook =NULL; //钩子句柄 VT5cxB<  
UINT nHookCount =0; //挂接的程序数目 ,>QMyI hv  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *b6I%MZn  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 d Ik8TJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Xew1LPI  
static int KeyCount =0; StdS$XW  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 O7'<I|aD  
#pragma data_seg() A'~%_}  
MR?*GI's  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 [B"dH-r7  
C`yvBt40r  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 'd2qa`H'}B  
=YXe1$ $  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR j*eUF-J1  
cKey,UCHAR cMask) 4[LLnF--  
{ ElEv(>G*  
 BOOL bAdded=FALSE; #LN5&i;s  
 for(int index=0;index<MAX_KEY;index++){ Z92iil;t  
  if(hCallWnd[index]==0){ ~|r'2V*  
   hCallWnd[index]=hWnd;  O ':0V  
   HotKey[index]=cKey; jsNH`"  
   HotKeyMask[index]=cMask; =.qm8+  
   bAdded=TRUE; Hyq@O 8  
   KeyCount++; 't0+:o">:  
   break; I+Ncmg )>  
  } kb"_6,[Ms  
 } xb+RRTgj  
 return bAdded; "'z,[v 50&  
} u{OS6Ky  
//删除热键 XSm"I[.g  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wQD0 vsD  
{ 9lZAa8Rxi  
 BOOL bRemoved=FALSE; eq@am(#&kY  
 for(int index=0;index<MAX_KEY;index++){ <THZ2`tTK3  
  if(hCallWnd[index]==hWnd){ G%P>A g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Hhe{ +W@~  
    hCallWnd[index]=NULL; yyY~ *Le  
    HotKey[index]=0; lC'{QUC  
    HotKeyMask[index]=0; u0bfX,e2U  
    bRemoved=TRUE; *PSvHXNi  
    KeyCount--; V-KL%  
    break; :jt;EzCLg%  
   } vU_d=T%$  
  } | ((1V^  
 } T~i%j@Q.6  
 return bRemoved; &=F-moDD  
} zb>f;[  
:]CzN^k(1c  
[%j?.N  
  DLL中的钩子函数如下: ?a'6EAErC  
> 63)z I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <*s"e)XeqF  
{ (O)\#%,@R  
 BOOL bProcessed=FALSE; Q0zW ]a  
 if(HC_ACTION==nCode) {fGd:2dh  
 { Usa+b A  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 jOUK]>ox:  
   switch(wParam) csH2_+uG  
   {  ?muDTD%c  
    case VK_MENU: <Rcu%&;i  
     MaskBits&=~ALTBIT; [[R7~.;  
     break; !dU9sB2  
    case VK_CONTROL: ;y>S7n>n:  
     MaskBits&=~CTRLBIT; o"rq/\ovv  
     break; Ds%9cp*6  
    case VK_SHIFT: g M4Pj[W  
     MaskBits&=~SHIFTBIT; C`\9c ej  
     break; QGs1zfh*  
    default: //judge the key and send message T>}0) s  
     break; Bk?8 zYp  
   } a q3~!T;W  
   for(int index=0;index<MAX_KEY;index++){ yXJ]U \ %  
    if(hCallWnd[index]==NULL) J|V K P7  
     continue; 9T(L"9r-e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;B&^yj&;  
    { e^j<jV`1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); c_ La^HS  
     bProcessed=TRUE; r55qmPhg  
    } 2t+D8 d|c<  
   } Fi mN?s  
  } >_XOc  
  else if((lParam&0xc000ffff)==1){ //有键按下 `NBbTQtgO  
   switch(wParam) A_!QrM  
   { O0^?f/&k  
    case VK_MENU: >T<6fpXuk2  
     MaskBits|=ALTBIT; \|CPR6I  
     break; 10p8|9rE}B  
    case VK_CONTROL: 6cJ<9i &  
     MaskBits|=CTRLBIT; ` ^DjEdUN  
     break; rwiw Rh  
    case VK_SHIFT:  %BUEX  
     MaskBits|=SHIFTBIT; _ Yfmxn8V  
     break; 3Jk[/ .h  
    default: //judge the key and send message H&M1>JtE  
     break; a:85L!~:l  
   } *HR +a#o  
   for(int index=0;index<MAX_KEY;index++){ PU W[e%  
    if(hCallWnd[index]==NULL) U^MuZ  
     continue; .%q$d d>>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $@_{p*q  
    { 93j{.0]X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M\Se_  
     bProcessed=TRUE; I%oRvg|q  
    } eP"`,<  
   } XAe\s`  
  } \V,c]I   
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 "!O1j r;  
   for(int index=0;index<MAX_KEY;index++){ |^R*4;Phe  
    if(hCallWnd[index]==NULL) bmu6@jT  
     continue; "e 1wr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *h$&0w y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -."kq.m*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 k<H%vg>{~s  
   } ( #* "c  
  } !xu9+{-  
 } cFK @3a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *i^`Dw^~y  
} h4_ b!E@  
;j{7!GeKa  
  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: lwc5S `"  
we3tx{j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gH[,Xx?BN!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ojq]HM6f  
zJ+3g!  
  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: w/W7N   
\<~}o I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N2BI_,hI1  
{ i31<].|kA*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `H>b5  
 { t2- ^-g6  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,MQVE  
  SaveBmp(); j(iuz^I  
  return FALSE; <:&de8bT  
 } >{C\H.N  
 …… //其它处理及默认处理 gY(1,+0-  
} fiVHRSX60  
)tS-.PrA-  
.h4\{|  
  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。 3GF2eS$$P  
!SO8O  
  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。 b O=yi)  
v!9i"@<!  
  二、编程步骤 !nd*W"_gQ/  
@Y}uZ'jt'  
  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"; "X04mQn15  
8Hi!kc;f6>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ^rL_C}YBj-  
/)EY2Y'  
  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; EF#QH _X  
[ %}u=}@  
  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; \ECu5L4  
{hQ6K)s  
  5、 添加代码,编译运行程序。 Iy';x  
<xo-Fv  
三、程序代码 ye%iDdf  
`S3>3  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  z [C3  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a^t?vv  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ H6K`\8/SeN  
#if _MSC_VER > 1000 <@G8ni  
#pragma once KVPR}qTP;  
#endif // _MSC_VER > 1000 BQ/PGY>  
#ifndef __AFXWIN_H__ gd7^3q[$h  
#error include 'stdafx.h' before including this file for PCH hIYTe  
#endif Ub_4yN;  
#include "resource.h" // main symbols e)H!uR  
class CHookApp : public CWinApp -)jax  
{ h5"Ov,K3[  
 public: +/rH(Ni  
  CHookApp(); ,qQG;w,m  
  // Overrides 3GH(wSv9\  
  // ClassWizard generated virtual function overrides c+kU o$  
  //{{AFX_VIRTUAL(CHookApp) LOvHkk@+  
 public: + H_WlYg-  
  virtual BOOL InitInstance(); %0,-.(h  
  virtual int ExitInstance(); 2-'Opu  
  //}}AFX_VIRTUAL Wht(O~F  
  //{{AFX_MSG(CHookApp) ;@3FF  
  // NOTE - the ClassWizard will add and remove member functions here. e5?PkFV^a1  
  // DO NOT EDIT what you see in these blocks of generated code ! a.@qGsIH  
  //}}AFX_MSG :7g=b%;  
  DECLARE_MESSAGE_MAP() QAPu<rdJP  
}; g&Vcg`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 80pid[F  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F'JY?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); R@iUCT^$  
BOOL InitHotkey(); +Qxu$#  
BOOL UnInit(); 71fk.16  
#endif  d$W  
-%CoWcGP  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. '?QuJFki  
#include "stdafx.h" @+LfQY  
#include "hook.h" EH*o"N`!r  
#include <windowsx.h> @U{<a#  
#ifdef _DEBUG :hRs`=d"r  
#define new DEBUG_NEW Ju2l?Rr X  
#undef THIS_FILE 8RW&r  
static char THIS_FILE[] = __FILE__; a4 MZ;5  
#endif 0aI;\D*Ts  
#define MAX_KEY 100 TUIk$U?/I  
#define CTRLBIT 0x04 1f'Hif*r_X  
#define ALTBIT 0x02 Wg`AZ=t  
#define SHIFTBIT 0x01 `J0i.0p  
#pragma data_seg("shareddata") (X[CsaXt  
HHOOK hHook =NULL; N K]B?  
UINT nHookCount =0; V 9wI\0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  m#vL*]c}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT w Y   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SqA J-_~  
static int KeyCount =0; A{eLl  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #R0A= !  
#pragma data_seg() "=. t 36#  
HINSTANCE hins; 20RXK1So  
void VerifyWindow(); V'Kgdj  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8.J( r(;>  
//{{AFX_MSG_MAP(CHookApp) bx4'en#  
// NOTE - the ClassWizard will add and remove mapping macros here. R6-n IY,  
// DO NOT EDIT what you see in these blocks of generated code! )E#2J$TD  
//}}AFX_MSG_MAP =sJ _yq0#R  
END_MESSAGE_MAP() 5yZTcS z  
-]uUYe c  
CHookApp::CHookApp() I<td1Y1q  
{ y&m0Lz53Z  
 // TODO: add construction code here, >'uU)Y {  
 // Place all significant initialization in InitInstance }A=y=+4 j  
} b2,mCfLsv  
iIT8H\e  
CHookApp theApp; >LC<O.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xo}b= v  
{ !" #9<~Q,p  
 BOOL bProcessed=FALSE; <h).fX  
 if(HC_ACTION==nCode) ;22l"-F  
 { l>gI&1)%  
  if((lParam&0xc0000000)==0xc0000000){// Key up xT&(n/  
   switch(wParam) 2T@GA 1G  
   { 6VP`evan  
    case VK_MENU: im7nJQ^H$q  
     MaskBits&=~ALTBIT; K;hh&sTB  
     break; 1=sXdcy;  
    case VK_CONTROL: Q5{Pv}Jx  
     MaskBits&=~CTRLBIT; w]b,7QuNz  
     break; '^BV_QQ  
    case VK_SHIFT: '>$EOg"  
     MaskBits&=~SHIFTBIT; X,aYK;q%z  
     break; `afIYXP  
    default: //judge the key and send message 5!YA o\S  
     break; %J:SO_6  
   } n% 'tKU\q  
   for(int index=0;index<MAX_KEY;index++){ Pi,QHb`>  
    if(hCallWnd[index]==NULL) 2kAx>R  
     continue; -oeL{9;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uwf 5!Z:>  
    { Hs?e0Z=N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h&.wo !  
     bProcessed=TRUE; {>LIMG-f  
    } D4eTTfQ  
   } tWTKgbj(  
  } 'i;|c  
  else if((lParam&0xc000ffff)==1){ //Key down R[z`:1lo  
   switch(wParam) a,F&`Wg  
   { 8.' #?]a  
    case VK_MENU: J:uW`R  
     MaskBits|=ALTBIT; `RU[8@ 2%  
     break; e^4 p%  
    case VK_CONTROL: sDr/k`>  
     MaskBits|=CTRLBIT; =S'%`]f?  
     break; YprH wL  
    case VK_SHIFT: 5uq3\a  
     MaskBits|=SHIFTBIT; fO'Wj`&a  
     break; dY?`f<*  
    default: //judge the key and send message }bN%u3mHws  
     break; c4&'D;=  
   } 73{'k K  
   for(int index=0;index<MAX_KEY;index++) /525w^'pd  
   { f/WQ[\<!I  
    if(hCallWnd[index]==NULL) iGB_{F~t4}  
     continue; T=hho Gn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dm-pxE "  
    { />'V!iWyz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;.xoN|Per  
     bProcessed=TRUE; |qZko[W}=  
    } b'MSkEiQG  
   } PB%-9C0  
  } L %ip>  
  if(!bProcessed){ M8H5K  
   for(int index=0;index<MAX_KEY;index++){ +^*iZ6{+7  
    if(hCallWnd[index]==NULL) PJxH7|GSi  
     continue; 5@*'2rO&!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Hf'G8vW  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (~zd6C1.  
   } K{n{KB&_&  
  } #;n +YM">:  
 } G?f\>QSZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q$1PG+-  
} Z_\C*^  
?JL7=o X  
BOOL InitHotkey() 6v,z@!b  
{  ^p n(=4  
 if(hHook!=NULL){ k = ?h~n0M  
  nHookCount++; WI]o cF  
  return TRUE; ^[%%r3"$C  
 } =%'`YbD$  
 else + OV')oE  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R52I= a5,*  
  if(hHook!=NULL) zF5uN:-s  
   nHookCount++; 3@5=+z~CW  
  return (hHook!=NULL); %m:m}ziLQ  
} zlR?,h-[3  
BOOL UnInit() l5l>d62  
{ I`z@2Z+pJ  
 if(nHookCount>1){ eEhr140  
  nHookCount--; \!]Ua.e<  
  return TRUE; BBcV9CGU  
 } ?"?6,;F(4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Z3[S]jC  
 if(unhooked==TRUE){ ,=?{("+  
  nHookCount=0; "[}O"LTQ  
  hHook=NULL; V\(:@0"  
 } )%!XSsY.N|  
 return unhooked; u?s VcD[  
} ng:Q1Q9N  
0%!rx{f#\  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :xKcpY[{  
{ + [Hh,I7  
 BOOL bAdded=FALSE; g$dsd^{O7  
 for(int index=0;index<MAX_KEY;index++){ JG{j)O|L  
  if(hCallWnd[index]==0){ .z13 =yv  
   hCallWnd[index]=hWnd; 52upoU>}2  
   HotKey[index]=cKey; [ sd;`xk  
   HotKeyMask[index]=cMask; qj cp65^  
   bAdded=TRUE; ]%Zz \Q  
   KeyCount++; P{Q=mEQ  
   break; FKe,qTqa  
  } 2lL,zFAq  
 } '+j} >Q  
 return bAdded; A(]H{>PMy  
} jqr1V_3(  
; S xFp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zE;bBwy&  
{ Be+0NXLVy  
 BOOL bRemoved=FALSE; %e*@CbO$  
 for(int index=0;index<MAX_KEY;index++){ 5SkW-+$  
  if(hCallWnd[index]==hWnd){ 5>AX*]c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T{wuj[ Q#:  
    hCallWnd[index]=NULL; u&wiGwF[  
    HotKey[index]=0; j5@:a  
    HotKeyMask[index]=0; L@JOGCYy  
    bRemoved=TRUE; W2uOR{ '?  
    KeyCount--; p&VU0[LIC0  
    break; \QU^>2 3  
   } Xl74@wq   
  } (knp#   
 } 9'hv%A:\3  
 return bRemoved; };'\~g,1  
} nC{%quwh{  
Zw wqSyuGf  
void VerifyWindow() #97h6m?  
{ Fs[aa#v4B  
 for(int i=0;i<MAX_KEY;i++){ Vb BPB5 $q  
  if(hCallWnd!=NULL){ u{["50~  
   if(!IsWindow(hCallWnd)){ ] }f9JNf$  
    hCallWnd=NULL; Pz$R(TV  
    HotKey=0; y\{%\$  
    HotKeyMask=0; ax 41N25  
    KeyCount--; DNP13wp@  
   } .jMq  
  } }MUn/ [x  
 } gk`zA  
} +**!@uY  
.5  
BOOL CHookApp::InitInstance() %,ngRYxT#  
{ Le%Z V%,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wj[$9UJb  
 hins=AfxGetInstanceHandle(); "kZ[N'z (  
 InitHotkey(); +MmHu6"1  
 return CWinApp::InitInstance(); NY?;erX  
} RoAlf+&Qb  
O#Wh TDF"  
int CHookApp::ExitInstance() i*CZV|t US  
{ ZcYh) HD  
 VerifyWindow(); ]r_;dYa  
 UnInit(); aM4k *|H?  
 return CWinApp::ExitInstance(); 9(":,M(/o  
} {&Q9"C  
U4G`ZK v(!  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file qY[xpm  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) LY-2sa#B$-  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ GRY2?'`  
#if _MSC_VER > 1000 $ /nY5[  
#pragma once |^@dFOz  
#endif // _MSC_VER > 1000 /> 4"~q)  
"O(9m.CZ  
class CCaptureDlg : public CDialog }pJwj  
{ P (S>=,Y&  
 // Construction 0T46sm r  
 public: 'fPdpnJ<  
  BOOL bTray; r [ K5w  
  BOOL bRegistered; c_elShK8#  
  BOOL RegisterHotkey(); MTUn3;c/  
  UCHAR cKey; O(_[ayE  
  UCHAR cMask; &5: tn=E  
  void DeleteIcon(); B-l'vVx  
  void AddIcon(); Uk\Id ~xLV  
  UINT nCount; H<1WbM:w  
  void SaveBmp(); S6[v;{xJ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >|;aIa@9  
  // Dialog Data EAeqLtFqs  
  //{{AFX_DATA(CCaptureDlg) ?mlNL/:  
  enum { IDD = IDD_CAPTURE_DIALOG }; h>Hb `G<  
  CComboBox m_Key; -1J[n0O.  
  BOOL m_bControl; + T8B:  
  BOOL m_bAlt; )Y)pmjZaG  
  BOOL m_bShift; xp Og8u5  
  CString m_Path;  }K3x  
  CString m_Number; >a}f{\Q  
  //}}AFX_DATA <vwkjCA`  
  // ClassWizard generated virtual function overrides Onwp-!!.  
  //{{AFX_VIRTUAL(CCaptureDlg)  @Pt="*g  
 public: GH[wv<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ~}<DG1!  
 protected: H9CS*|q6r  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B,{K*-7)MX  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); MR}Agu#LG  
  //}}AFX_VIRTUAL +a*tO@HG  
  // Implementation \G-KplKS  
 protected: &~W:xg(jN  
  HICON m_hIcon; zk( U8C+  
  // Generated message map functions l<N}!lG|  
  //{{AFX_MSG(CCaptureDlg) ."FuwKSJCo  
  virtual BOOL OnInitDialog(); DY^;EZ!hb  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); AFAAuFE"  
  afx_msg void OnPaint(); Xn{1 FJX/  
  afx_msg HCURSOR OnQueryDragIcon(); $LU"?aAW  
  virtual void OnCancel(); v,ju!I0.  
  afx_msg void OnAbout(); F+u|HiYG  
  afx_msg void OnBrowse(); ,{c?ymw?  
  afx_msg void OnChange(); ^_m9KA  
 //}}AFX_MSG YY!Rz[/  
 DECLARE_MESSAGE_MAP() 71\xCSI1w&  
}; 4t)/  
#endif ~ yX2\i"  
KGg3 !jY  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file e;(0(rI  
#include "stdafx.h" y99mC$"Ee`  
#include "Capture.h" )P+7PhE{J  
#include "CaptureDlg.h" !50[z:  
#include <windowsx.h> & \f{E\A#  
#pragma comment(lib,"hook.lib") $*?,#ta  
#ifdef _DEBUG )6aAB|  
#define new DEBUG_NEW r9dyA5oD  
#undef THIS_FILE f`Fi#EKT  
static char THIS_FILE[] = __FILE__; zE_i*c"`  
#endif D gaMO,  
#define IDM_SHELL WM_USER+1 YD7Oao4:o  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $ , u+4h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X*\ J_  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #{\%rWnCm  
class CAboutDlg : public CDialog JeE ;V![  
{ dN$Tf  
 public:  E@b(1@  
  CAboutDlg(); )KAEt.  
  // Dialog Data rh^mJU h  
  //{{AFX_DATA(CAboutDlg) r3PT1'P?L  
  enum { IDD = IDD_ABOUTBOX }; cMOyo<F#^=  
  //}}AFX_DATA LSRk7'0  
  // ClassWizard generated virtual function overrides o !U 6?  
  //{{AFX_VIRTUAL(CAboutDlg) 7"C$pm6  
 protected: j}C}:\-fY  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ct>GYk$  
  //}}AFX_VIRTUAL UNBH  
  // Implementation mrjswF27$o  
 protected: g?ULWeZg5  
  //{{AFX_MSG(CAboutDlg) _D+J!f^  
  //}}AFX_MSG X93!bB  
  DECLARE_MESSAGE_MAP() r! MWbFw|X  
}; N}t 2Nu-  
\7'+h5a  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5bg s*.s  
{ - RU=z!{  
 //{{AFX_DATA_INIT(CAboutDlg) ruld B,n  
 //}}AFX_DATA_INIT KGFv"u{  
} ;4pYK@9w_  
q0zr E5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) G2T|RT $_K  
{ n~V ]Z  
 CDialog::DoDataExchange(pDX); uu>Pkfo  
 //{{AFX_DATA_MAP(CAboutDlg) @8I4[TE  
 //}}AFX_DATA_MAP ;N?]eM}yf  
} (R("H/6xs  
53n^3M,qK  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ;67x0)kn  
 //{{AFX_MSG_MAP(CAboutDlg) LBZ+GB  
 // No message handlers AnX%[W "  
 //}}AFX_MSG_MAP e\:+uVzz  
END_MESSAGE_MAP() FFEfI4&SfS  
W*I(f]8:y`  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ZG&>:Si;  
: CDialog(CCaptureDlg::IDD, pParent) mmk=97  
{ #iHs* /85  
 //{{AFX_DATA_INIT(CCaptureDlg) Ev}C<zk*  
  m_bControl = FALSE; TJR:vr  
  m_bAlt = FALSE; fNW"+ <W  
  m_bShift = FALSE; (O(}p~s  
  m_Path = _T("c:\\"); jr:7?8cH0L  
  m_Number = _T("0 picture captured."); SR |`!  
  nCount=0; @/ohg0  
  bRegistered=FALSE; P&^;656r  
  bTray=FALSE; JAem0jPC8  
 //}}AFX_DATA_INIT yL-YzF2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 G\+L~t  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y#z  
} QvKh,rBFVG  
7V!*NBsl  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) VL` z[|e @  
{ ia+oX~W!VR  
 CDialog::DoDataExchange(pDX); .E8_Oz  
 //{{AFX_DATA_MAP(CCaptureDlg) Su/6Q$0 t  
  DDX_Control(pDX, IDC_KEY, m_Key); SSWP~ t  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :x4|X8>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 2so!  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8b;1F Q'  
  DDX_Text(pDX, IDC_PATH, m_Path); I$Op:P6.E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3!|;iJRH  
 //}}AFX_DATA_MAP ud'-;W  
} "4{LN}`  
LQRQA[^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F7EKoDt  
//{{AFX_MSG_MAP(CCaptureDlg) [R^i F  
 ON_WM_SYSCOMMAND() Ay0U=#XP  
 ON_WM_PAINT() WGZ9B^A  
 ON_WM_QUERYDRAGICON()  jYmR  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n|RJ;d30Q  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ORJIo  
 ON_BN_CLICKED(ID_CHANGE, OnChange) mQ|v26R  
//}}AFX_MSG_MAP !u[eaLxV  
END_MESSAGE_MAP() 9\mLW"  
&&8IU;J  
BOOL CCaptureDlg::OnInitDialog() `n @*{J8  
{ 6"J? #  
 CDialog::OnInitDialog(); ijK"^4i  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); < (fRn`)PT  
 ASSERT(IDM_ABOUTBOX < 0xF000); R?"q]af~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); SVh 7zh  
 if (pSysMenu != NULL) \kMefU  
 { !W}9no  
  CString strAboutMenu; zkuU5O  
  strAboutMenu.LoadString(IDS_ABOUTBOX); eo?;`7  
  if (!strAboutMenu.IsEmpty()) o.!~8mD  
  { 7` zHX&-W  
   pSysMenu->AppendMenu(MF_SEPARATOR); qh|_W(`y  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); pS'FI@.'{  
  } Y4`}y-'d  
 } Tz8PSk1[  
 SetIcon(m_hIcon, TRUE); // Set big icon v50bdj9}k  
 SetIcon(m_hIcon, FALSE); // Set small icon PGhY>$q>b  
 m_Key.SetCurSel(0); bB1UZ O  
 RegisterHotkey(); Vr`R>S,-  
 CMenu* pMenu=GetSystemMenu(FALSE); NflD/q/ L  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;S^'V  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); q$Zh@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); WrxP  
 return TRUE; // return TRUE unless you set the focus to a control d"*uBVzXm  
} }Mp:JPH&S4  
O7-mT8o  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q1"$<# t  
{ F@'Jbd`   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) BW}U%B^.  
 { W14 J],{L  
  CAboutDlg dlgAbout; !Sh&3uy_qN  
  dlgAbout.DoModal(); >,$_| C  
 } z"-u95H  
 else * K D I}B>  
 { r%yvOF\>  
  CDialog::OnSysCommand(nID, lParam); ~=6xyc/c  
 } +eK"-u~K  
} aW)-?(6>  
mD$A4Y-'p  
void CCaptureDlg::OnPaint() hIs4@0  
{ -.u]GeMy  
 if (IsIconic()) :t8b39  
 { @"Fme-~  
  CPaintDC dc(this); // device context for painting j,lT>/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); S1Wj8P-  
  // Center icon in client rectangle *`ua'"="k  
  int cxIcon = GetSystemMetrics(SM_CXICON); n 22zq6m  
  int cyIcon = GetSystemMetrics(SM_CYICON); &_dt>.  
  CRect rect; {JZZZY!n2  
  GetClientRect(&rect); Tc>   
  int x = (rect.Width() - cxIcon + 1) / 2; .w=/+TA  
  int y = (rect.Height() - cyIcon + 1) / 2; r ~jm`y  
  // Draw the icon \E72L5nJW  
  dc.DrawIcon(x, y, m_hIcon); AN8`7F1  
 } |:nOp(A\*  
 else m? J0i>H  
 { 4o <Uy  
  CDialog::OnPaint(); u~7hWiY<2  
 } H]{v;;'~  
} C*)3e*T*  
r3&G)g=u  
HCURSOR CCaptureDlg::OnQueryDragIcon() |[<_GQl  
{ U@_dm/;0&  
 return (HCURSOR) m_hIcon; EUD~CZhS"k  
} , pDnRRJ!  
5[k/s}g  
void CCaptureDlg::OnCancel() Xx."$l  
{ :DrWq{4  
 if(bTray) `w#Oih!6A|  
  DeleteIcon(); v5!d$Vctu  
  CDialog::OnCancel(); 2&:f&"  
} $+8cc\fq  
Pk{_(ybaY  
void CCaptureDlg::OnAbout() =9y[1t  
{ LSa,1{  
 CAboutDlg dlg; p4.wh|n  
 dlg.DoModal(); A-Sv;/yD_  
} L-jJg,eY  
bhTb[r  
void CCaptureDlg::OnBrowse() u)X=Qm)  
{ r?+%?$  
 CString str; 3 }TaF~  
 BROWSEINFO bi; >Ea8G,  
 char name[MAX_PATH]; ~ -4{B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :~b3^xhc^  
 bi.hwndOwner=GetSafeHwnd(); lGPUIoUo  
 bi.pszDisplayName=name; Bn=by{i  
 bi.lpszTitle="Select folder"; .0S~872  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Uol|9F  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); B:b5UD  
 if(idl==NULL) ZXqSH${Tp  
  return; B8.Pn  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ] bM)t<  
 str.ReleaseBuffer(); 6}gls}[0{e  
 m_Path=str; 1L%CJ+Q#0i  
 if(str.GetAt(str.GetLength()-1)!='\\') ocqU=^ta  
  m_Path+="\\"; g`{;(/M+  
 UpdateData(FALSE);  8{wwd:6  
} 9oRy)_5Z(=  
/[a~3^Gs^  
void CCaptureDlg::SaveBmp() q.KG^=10  
{ -[ *,^Ti`  
 CDC dc; SN9kFFIPb=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); m'Amli@[  
 CBitmap bm; ''q@>  
 int Width=GetSystemMetrics(SM_CXSCREEN); O,+1<.;+  
 int Height=GetSystemMetrics(SM_CYSCREEN); $? m9")  
 bm.CreateCompatibleBitmap(&dc,Width,Height); rXmn7;B}g  
 CDC tdc; 9oyE$S h]  
 tdc.CreateCompatibleDC(&dc); 04LI]'  
 CBitmap*pOld=tdc.SelectObject(&bm); <{dVKf,e  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); r@72|:,  
 tdc.SelectObject(pOld); "Q}#^h]F  
 BITMAP btm; ^ZvWR%  
 bm.GetBitmap(&btm); sv: 9clJ  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; '-r).Xk  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 6LOnU~l,  
 BITMAPINFOHEADER bih; &vo--V1|  
 bih.biBitCount=btm.bmBitsPixel; 9v;Vv0k_  
 bih.biClrImportant=0; Od)Uv1  
 bih.biClrUsed=0; qW$<U3u}  
 bih.biCompression=0; F f$L|  
 bih.biHeight=btm.bmHeight;  A sQ)q  
 bih.biPlanes=1; i2@VB6]?  
 bih.biSize=sizeof(BITMAPINFOHEADER); y~Bh  
 bih.biSizeImage=size; n&{Dq}q  
 bih.biWidth=btm.bmWidth; RHaI~jb  
 bih.biXPelsPerMeter=0; _D+}q_  
 bih.biYPelsPerMeter=0; NTdixfR  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); (_niMQtF}  
 static int filecount=0; \a5U8shc  
 CString name; ]9YJ,d@J  
 name.Format("pict%04d.bmp",filecount++); Qi ua  
 name=m_Path+name; V@B__`y7  
 BITMAPFILEHEADER bfh; -|J"s$yO4  
 bfh.bfReserved1=bfh.bfReserved2=0; HKU~UTRnZ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); nim*/LC[:  
 bfh.bfSize=54+size; 3p3 9`"~  
 bfh.bfOffBits=54; ~k\fhx  
 CFile bf; zjJ *n8l  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 9E zj"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 6TQoqH8@U  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); UR%/MV  
  bf.WriteHuge(lpData,size); ?+_Gs;DGVE  
  bf.Close(); txJr;  
  nCount++; 8e*,jH3  
 } "oTHq]Ku  
 GlobalFreePtr(lpData); ))R5(R  
 if(nCount==1) q+Lr"&'Q  
  m_Number.Format("%d picture captured.",nCount); G^~k)6v=m  
 else 9*2[B"5  
  m_Number.Format("%d pictures captured.",nCount); C\3y {s  
  UpdateData(FALSE); ~8~aJ^[  
} gcE|#1>  
J,V9k[88  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) bP8Sj16q  
{ O;z,qo X  
 if(pMsg -> message == WM_KEYDOWN) s:OFVlC%\  
 { 1/RsptN"v  
  if(pMsg -> wParam == VK_ESCAPE) Te.Y#lCT$  
   return TRUE; >7wOoK|1'  
  if(pMsg -> wParam == VK_RETURN) |2?'9<  
   return TRUE; ~o82uw?  
 } ~c8? >oN(  
 return CDialog::PreTranslateMessage(pMsg); @E^~$-J5j  
} sc|_Q/`\.  
o]+z)5zC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fdxLAC  
{ 1QqYQafA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ RS"H8P 4W  
  SaveBmp(); L; T8?+x  
  return FALSE; vGc,vjC3x  
} ;o^eC!:/%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ }E+!91't.^  
 CMenu pop; ,oN8HpGs  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); k'gh  
 CMenu*pMenu=pop.GetSubMenu(0); 1LqoF{S:  
 pMenu->SetDefaultItem(ID_EXITICON); 6o |kIBte-  
 CPoint pt; !,l9@eJQ  
 GetCursorPos(&pt); m#8m] Y  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VGfMN|h  
 if(id==ID_EXITICON) d_AK `wR  
  DeleteIcon(); yW+yg{Gg:  
 else if(id==ID_EXIT) +!k&Yje  
  OnCancel(); >NqYyW,%  
 return FALSE; Ot:CPm@  
} Vx(B{5>Vu  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); kQ4dwF~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) +J_c'ChN  
 AddIcon(); l/BLUl~z  
 return res; Jpj}@,  
} b^ L \>3  
B||*.`3gN  
void CCaptureDlg::AddIcon() CEXyrs<  
{ 3b*cU}go  
 NOTIFYICONDATA data; &Flglj~7l  
 data.cbSize=sizeof(NOTIFYICONDATA); dI*pDDq#  
 CString tip; t2EHrji~  
 tip.LoadString(IDS_ICONTIP); d{rQzia"mV  
 data.hIcon=GetIcon(0); A3rPt&<a  
 data.hWnd=GetSafeHwnd(); x1Lb*3Fe  
 strcpy(data.szTip,tip); nnCG g+l  
 data.uCallbackMessage=IDM_SHELL; ~1cnE:x;V  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $@sEn4h  
 data.uID=98; bsuus R9W  
 Shell_NotifyIcon(NIM_ADD,&data); cnSJ{T  
 ShowWindow(SW_HIDE); sqla}~CiX  
 bTray=TRUE; 'HT7_$?*  
} P.6nA^hXB  
rJPb 3F  
void CCaptureDlg::DeleteIcon() K2 he4<  
{ 6^%UU o%  
 NOTIFYICONDATA data; LL]zT H0  
 data.cbSize=sizeof(NOTIFYICONDATA); qgE 73.!`6  
 data.hWnd=GetSafeHwnd(); /nyUG^5#{  
 data.uID=98; 4S,`bnmB  
 Shell_NotifyIcon(NIM_DELETE,&data); ^cV;~&|.Xk  
 ShowWindow(SW_SHOW); $>*3/H  
 SetForegroundWindow(); _Bj)r}~7#  
 ShowWindow(SW_SHOWNORMAL); wkP#Z"A0~  
 bTray=FALSE; (2$( ?-M  
} >QA uEM  
)_1zRT|9  
void CCaptureDlg::OnChange() =2Bg9!zW>  
{ JQ}$Aqk  
 RegisterHotkey(); >GQEqXs  
} L~_9_9c  
Z= jr-)kK  
BOOL CCaptureDlg::RegisterHotkey() g$( V^  
{ qi;f^9M%  
 UpdateData(); q/4YS0CqE  
 UCHAR mask=0; I*LknU@  
 UCHAR key=0; k:*S&$S!E  
 if(m_bControl) dArDP[w  
  mask|=4; 'I_Qb$  
 if(m_bAlt) 0zo?eI  
  mask|=2; 9dFy"yxYa  
 if(m_bShift) +cIUGF p}  
  mask|=1; k9)jjR*XxG  
  key=Key_Table[m_Key.GetCurSel()]; PH`9MXh  
 if(bRegistered){ ="x\`+U  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^m?KRm2  
  bRegistered=FALSE; P9=?zh 6G.  
 } b}0,\B%  
 cMask=mask; OTMJ6)n7  
 cKey=key; _8"O$w  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0QPH}Vi5}  
 return bRegistered; szsk;a  
} 7#@cz5Su  
f-}[_Y%;  
  四、小结 Se HagKA  
9l}FU$  
  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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