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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}fC' h  
  /lbj!\~  
  一、实现方法 P4HoKoj2`  
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  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: vp2w^/])u  
0Ix,c(%  
#pragma data_seg("shareddata") )u+O~Y95&i  
HHOOK hHook =NULL; //钩子句柄 k,$/l1D  
UINT nHookCount =0; //挂接的程序数目 'j*Q   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 bfpeK>T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 3b\s;!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ;e*okYM  
static int KeyCount =0; 4evNZ Q  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @D=B5f@(o  
#pragma data_seg() k>F!S`a&m  
2Y%7.YX"  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 5Q <vS"g  
*= O]^|]2  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 9+MW13?  
=dH=3iCG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR KB^8Z@(+  
cKey,UCHAR cMask) <p CD>  
{ qtdkK LT  
 BOOL bAdded=FALSE; )^BZ,e  
 for(int index=0;index<MAX_KEY;index++){ q6N{N>-D  
  if(hCallWnd[index]==0){ 1X2|jj  
   hCallWnd[index]=hWnd; kkfBVmuW  
   HotKey[index]=cKey; k-a1^K3  
   HotKeyMask[index]=cMask; I{[}1W3]W  
   bAdded=TRUE;  5k@T{  
   KeyCount++; R(pQu! K4  
   break; P>u2""c  
  } )5n0P Zi  
 } \9@}0}%`  
 return bAdded; P5h*RV>oS  
} ?mM:oQH+>  
//删除热键 k~so+k&=b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hSxK*.W*3  
{ cuH5f}oc  
 BOOL bRemoved=FALSE; %TRJ  
 for(int index=0;index<MAX_KEY;index++){ ftcLP  
  if(hCallWnd[index]==hWnd){ 5x|$q kI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?]bx]Y;  
    hCallWnd[index]=NULL; jbq x7x  
    HotKey[index]=0; 5FuV=Yuc  
    HotKeyMask[index]=0; I L7kpH+y  
    bRemoved=TRUE; Z2@e~&L  
    KeyCount--; 4OLYB9HP_  
    break; m>48?%  
   } ^wc:qll  
  } @=P c{xp  
 } v FQ]>n X  
 return bRemoved;  6W  
} so1  
sN-u?EiF8  
KPDJ$,:  
  DLL中的钩子函数如下: V1Ojr~iM  
/2E Q:P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -O,:~a=*_  
{ S&-F(#CF^  
 BOOL bProcessed=FALSE; H"A@Q.'  
 if(HC_ACTION==nCode) w2V:x[  
 { L4T\mP7D7*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |A,.mOT  
   switch(wParam) '5*&  
   {  `KLr!<i()  
    case VK_MENU: nC !NZ  
     MaskBits&=~ALTBIT; fj['M6+wd  
     break; Cq7 uy  
    case VK_CONTROL: \2[tM/+Bs  
     MaskBits&=~CTRLBIT; -dF (_ %C  
     break; p %.Adxx  
    case VK_SHIFT: g$mMH  
     MaskBits&=~SHIFTBIT; *2N0r2t&  
     break; Ac{TqiIv  
    default: //judge the key and send message ^b~ZOg[p  
     break; _t;^\"\  
   } -IVWkA)7  
   for(int index=0;index<MAX_KEY;index++){ cZ !$XXA`  
    if(hCallWnd[index]==NULL) _1O .{O  
     continue; qhG2j;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ReD]M@;  
    { 4 ;)t\9cy_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %"oGJp  
     bProcessed=TRUE; ^8bc<c:P  
    } YahW%mv`d  
   } T`j {2  
  } "x.iD,>k  
  else if((lParam&0xc000ffff)==1){ //有键按下 kI04<!  
   switch(wParam) Het>G{  
   { %Jd!x{a`>A  
    case VK_MENU: Av yer/{  
     MaskBits|=ALTBIT; ~ArRD-_t  
     break; a%a0/!U[  
    case VK_CONTROL: >dgq2ok!u  
     MaskBits|=CTRLBIT; kREFh4QO,  
     break; ;5$ GJu(  
    case VK_SHIFT: 5+Tx01 )  
     MaskBits|=SHIFTBIT; vg3iT }  
     break; hT_Q_1,  
    default: //judge the key and send message nO'C2)bBSG  
     break; *' es(]W  
   } q9VBK(,X  
   for(int index=0;index<MAX_KEY;index++){ :/6aBM?  
    if(hCallWnd[index]==NULL) v8'XchJ  
     continue; K?e16;   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [~cz| C#  
    { e2tru_#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?IS[2 v$   
     bProcessed=TRUE; 3LJ\y  
    } ?G7*^y&Q  
   } @c"s6h&  
  } &}C-W* f,Z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $%ND5uK  
   for(int index=0;index<MAX_KEY;index++){ yKK9b  
    if(hCallWnd[index]==NULL) @].!}tz  
     continue; \ kY:|T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) XV4aR3n{Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); }X=c|]6i^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #PPHxh*S  
   } U|.r -$|5P  
  } EBk-qd a}  
 } 'r_Fi5[q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); khT[  
} #u+qV!4  
Y=_*Ai  
  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: pmurG  
xQzW6H|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lgK5E *^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %|:j=/_  
,CPAS}kS  
  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: ez%:>r4  
9M1DE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~ Al3Dv9x  
{ }wBpBw2J  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  huyfo1(  
 { :i {; 81V  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 cD!E.2[  
  SaveBmp(); c05-1  
  return FALSE; u0)9IZxc  
 } vr?u=_%Z  
 …… //其它处理及默认处理 Pk(%=P ,  
} 9&Y|,&W  
O8v9tGZoh  
R47y/HG,  
  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。 S9nn^vsK  
UA]T7r@  
  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。 1=9GV+`n  
)a'`  
  二、编程步骤 0 "TPY(n  
=|empv#  
  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"; #)48dW!n  
*wd=&Z^19  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; L *|P'  
}.WO=IZ  
  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; XDyo=A]  
:J x%K  
  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; 1g t 7My  
<s|.2~  
  5、 添加代码,编译运行程序。  xI#rnx*  
p15dbr1  
三、程序代码 2 w! 0$  
3,*A VcQA  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "H@I~X=  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) WD[jEWMV7D  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ luac  
#if _MSC_VER > 1000 |f1^&97=+  
#pragma once 2>9..c  
#endif // _MSC_VER > 1000 FjiIB1 T  
#ifndef __AFXWIN_H__ SfrM|o  
#error include 'stdafx.h' before including this file for PCH h -091N  
#endif L*4= b (3  
#include "resource.h" // main symbols pEN`6*  
class CHookApp : public CWinApp t,0}}9%?  
{ \h0+` ;Q  
 public: M%Vp_ 0  
  CHookApp(); Lc]hwMGR*  
  // Overrides dN:^RCFzS  
  // ClassWizard generated virtual function overrides fk1d iB  
  //{{AFX_VIRTUAL(CHookApp)  rf'A+q  
 public: Vu4LC&q  
  virtual BOOL InitInstance(); ePaC8sd0  
  virtual int ExitInstance(); `C-8zA  
  //}}AFX_VIRTUAL i&%dwqp  
  //{{AFX_MSG(CHookApp) b KDD29  
  // NOTE - the ClassWizard will add and remove member functions here. QK#qW-49O  
  // DO NOT EDIT what you see in these blocks of generated code ! I3sfOU  
  //}}AFX_MSG +u5xK  
  DECLARE_MESSAGE_MAP() 4k<U5J  
}; #SI]^T|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); t.O~RE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #}~?8/h!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5 /oW/2"  
BOOL InitHotkey(); #u\~AO?h  
BOOL UnInit(); [(TmAEON  
#endif I4UsDs*BD  
d>#X+;-k  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g1y@z8Z{  
#include "stdafx.h" h. 4#C}> )  
#include "hook.h" yiH;fK+x  
#include <windowsx.h> o"P)(;  
#ifdef _DEBUG K)Z~ iBRM  
#define new DEBUG_NEW At[SkG}b  
#undef THIS_FILE j b'M  
static char THIS_FILE[] = __FILE__; "qZTgCOY2  
#endif [ws;|n h  
#define MAX_KEY 100 I.~=\%Z {  
#define CTRLBIT 0x04 ,qV7$u  
#define ALTBIT 0x02 b`DPlQHj  
#define SHIFTBIT 0x01 )u]=^  
#pragma data_seg("shareddata") ZdPqU \G^q  
HHOOK hHook =NULL; _ogN   
UINT nHookCount =0; %X%f0J  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \FCPD.2s+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT i/!KUbt  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey WHLTJ]OB  
static int KeyCount =0; b{x/V9&|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift )/OIzbA3#  
#pragma data_seg() SymlirL  
HINSTANCE hins; *] >R  
void VerifyWindow(); f/0k,~,*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z$('MQ|Ur  
//{{AFX_MSG_MAP(CHookApp) YbZ?["S&  
// NOTE - the ClassWizard will add and remove mapping macros here. 3Y +;8ld  
// DO NOT EDIT what you see in these blocks of generated code! tF<&R& =  
//}}AFX_MSG_MAP YT)1_>*\  
END_MESSAGE_MAP() Zm6jF  
'r-B%D=  
CHookApp::CHookApp() 43,*.1;sz  
{ GGZ9DC\{  
 // TODO: add construction code here, .]<gm9l  
 // Place all significant initialization in InitInstance x1Gc|K/-  
} Y q|OX<i`K  
ajkpU.6E:  
CHookApp theApp; d5{RIM|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m?4HVv  
{ 9 *v14c%  
 BOOL bProcessed=FALSE; ku>Bxau4>  
 if(HC_ACTION==nCode) 7[R`52pP  
 {  N PqO b  
  if((lParam&0xc0000000)==0xc0000000){// Key up |GPY bxzc  
   switch(wParam) i_`Po%   
   { z t!>  
    case VK_MENU: Ia{t/IX\[  
     MaskBits&=~ALTBIT; LCHw.  
     break; Pe11a zJ  
    case VK_CONTROL: K>\v<!%a  
     MaskBits&=~CTRLBIT; 889^P`Q5  
     break; ]'>jw#|h  
    case VK_SHIFT: Go]y{9+(7  
     MaskBits&=~SHIFTBIT; I.SMn,N  
     break; GFnwj<V+{  
    default: //judge the key and send message m5P@F@  
     break; 1NrNTBI@  
   } rV-Xsf7Z  
   for(int index=0;index<MAX_KEY;index++){ /P/0\3TCi  
    if(hCallWnd[index]==NULL) v!n|X7  
     continue; 6aWnj*dF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `Uvc^  
    { cb. -AlqQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1n.F`%YG  
     bProcessed=TRUE; &,,:pL[  
    } )! k l:  
   } Qdc)S>gp  
  } !9V; 8g  
  else if((lParam&0xc000ffff)==1){ //Key down VPVg \K{  
   switch(wParam) 7kMO);pO  
   { n%QWs 1 b  
    case VK_MENU: K&-u W_0  
     MaskBits|=ALTBIT; Q } 0_}W  
     break; w`=XoYQl~*  
    case VK_CONTROL: #??[;xjs!  
     MaskBits|=CTRLBIT; &=In  
     break; PbV1FB_  
    case VK_SHIFT: #.,LWL]  
     MaskBits|=SHIFTBIT; 3_{rXtT)'  
     break; usi3z9P>n  
    default: //judge the key and send message #nj;F'O](  
     break; z\WyL;  
   } ScT{Tb]9bt  
   for(int index=0;index<MAX_KEY;index++) PHH,vO[eO  
   { md/h\o&  
    if(hCallWnd[index]==NULL) 7$R^u7DZ  
     continue; 6mxzE3?G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ClPE_Cfw~  
    { 52'6wwv6?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $$B#S '  
     bProcessed=TRUE; [l~G7u.d  
    } DTdqwe6pi  
   } ? Z2`f6;W4  
  } j5~~%  
  if(!bProcessed){ 8\?H`NN  
   for(int index=0;index<MAX_KEY;index++){ Z:,`hW*A6  
    if(hCallWnd[index]==NULL) }+)q/]%  
     continue; e%=SgXl2t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) |`AJP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); g-/ }*m l  
   } , $cpm=1  
  } %T}*DC$&S  
 } :{KpnJvd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); og4mLoLA  
} L/N%ft]!T  
dTwYDV}:  
BOOL InitHotkey() fK^;?4  
{ @$~;vS  
 if(hHook!=NULL){ ~svea>Fmr  
  nHookCount++; 2LCOB&-Ww  
  return TRUE; S++jwP  
 } d^5x@E_Td  
 else nM!_C-yX  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); $?;)uoAg  
  if(hHook!=NULL) L3*HgkQQ  
   nHookCount++; d-H03F@N  
  return (hHook!=NULL); e=[@HVr   
} hN\Q&F!  
BOOL UnInit() xo!2 GPD.  
{ X'/'r.b6  
 if(nHookCount>1){ wf^p?=Ke  
  nHookCount--; 12tAx3p  
  return TRUE; IGA4"\s  
 } n3\~H9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); q{xF7}i  
 if(unhooked==TRUE){ JL7;l0#  
  nHookCount=0; }Am5b@g"$Y  
  hHook=NULL; R)=){SI:1)  
 } >h$Q%w{V  
 return unhooked; -6e^`c6{  
} 4(`U]dNcs  
%@HuAcNi  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zS`KJVm  
{ S>s+ nqcP  
 BOOL bAdded=FALSE; M'pIAm1p  
 for(int index=0;index<MAX_KEY;index++){ j.\0p-,  
  if(hCallWnd[index]==0){ E!=Iz5  
   hCallWnd[index]=hWnd; >H,E3Z  
   HotKey[index]=cKey; ofs'xs1C  
   HotKeyMask[index]=cMask; ZsP>CELm@  
   bAdded=TRUE; CSBDSz  
   KeyCount++; NLt"yD3t  
   break;  y&wo"';  
  } q7I(x_y /  
 } JOwu_%  
 return bAdded; -\25&m!+  
} sDBwD%sb  
$gCN[%+j  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *bzqH2h8  
{ qXoq< |  
 BOOL bRemoved=FALSE; R.YUUXT  
 for(int index=0;index<MAX_KEY;index++){ sg4(@>  
  if(hCallWnd[index]==hWnd){ nZEew .T:6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?gMq:[X N  
    hCallWnd[index]=NULL; y-~_W 6\  
    HotKey[index]=0; Us%g&MWdpb  
    HotKeyMask[index]=0; uF[~YJ>  
    bRemoved=TRUE; 7ab'q&Y[  
    KeyCount--; 7zowvE?#  
    break; 60WlC0Y~u  
   } fk\]wFj  
  } n8i: /ypB  
 } mRxeob  
 return bRemoved; ^,`]Q)P^  
} 4hkyq>c}  
02-% B~oP  
void VerifyWindow() CXTt N9N9  
{ $h5QLN  
 for(int i=0;i<MAX_KEY;i++){ (#]9{ C;  
  if(hCallWnd!=NULL){ ``>z8t[ks  
   if(!IsWindow(hCallWnd)){ X(Z(cY(  
    hCallWnd=NULL; @S6@pMo,  
    HotKey=0; Z1] 4:  
    HotKeyMask=0; #];ulDq  
    KeyCount--; A f}o/g  
   } |<uBJ-5  
  } g@Rs.Zq  
 } 7JBr{3;eS  
} v<mSd2B*  
apnpy\in  
BOOL CHookApp::InitInstance() #8y"1I=i&  
{ wn\ R|'Rdz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); . "7-f]!  
 hins=AfxGetInstanceHandle(); G9@5 !-  
 InitHotkey(); ^ ~dC&!D  
 return CWinApp::InitInstance(); 3Z7gPU!H=  
} d ]jF0Wx*  
,V{Bpr  
int CHookApp::ExitInstance() '-3K`[  
{ "6v_<t`q"  
 VerifyWindow(); n$E$@  
 UnInit(); S>jOVWB  
 return CWinApp::ExitInstance(); E%a&6W  
} Z/ L%?zH  
K#VGG,h7Y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file MeAY\V%G=o  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) nQ{~D5y,,  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .kJu17!  
#if _MSC_VER > 1000 >;%LW} %  
#pragma once Y' 5X4Ks|  
#endif // _MSC_VER > 1000 ja(ZJ[<`  
n'%cO]nSx  
class CCaptureDlg : public CDialog dV-6l6  
{ T&}KUX~Q/  
 // Construction b~(S;1NS'  
 public: 5Fbb5`(  
  BOOL bTray; tvJl&{-OX  
  BOOL bRegistered; )19#g1rn5  
  BOOL RegisterHotkey(); LLbI}:  
  UCHAR cKey; D}U gC\u  
  UCHAR cMask; 1K'cT\aFm  
  void DeleteIcon(); QSwT1P'U  
  void AddIcon(); ;vn0b"Fi3  
  UINT nCount; P/Y)Yx_(  
  void SaveBmp(); ac1(lD  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ,uO_C(G/i  
  // Dialog Data MPYYTQ1FB  
  //{{AFX_DATA(CCaptureDlg) _xnJfW_  
  enum { IDD = IDD_CAPTURE_DIALOG }; >ul&x!?@  
  CComboBox m_Key; !(3[z>  
  BOOL m_bControl; rje;Bf  
  BOOL m_bAlt; lA`-"  
  BOOL m_bShift; dTte4lh  
  CString m_Path; =5uhIU0O  
  CString m_Number; z)Yb9y>2  
  //}}AFX_DATA *z0 R f;  
  // ClassWizard generated virtual function overrides U!YoZ?  
  //{{AFX_VIRTUAL(CCaptureDlg) s!1/Bm|_T  
 public: v?n# C  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T7l,}G  
 protected: p4kK" \ln  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7Q,<h8N\5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); u#Bj#y!  
  //}}AFX_VIRTUAL ]I]G3 e  
  // Implementation CZ%KC$l.5  
 protected: uLNOhgSUf  
  HICON m_hIcon; 4w]<1V  
  // Generated message map functions /AY q^  
  //{{AFX_MSG(CCaptureDlg) K <WowU  
  virtual BOOL OnInitDialog(); =l6W O*  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,'sDauFn  
  afx_msg void OnPaint(); _ozg=n2(  
  afx_msg HCURSOR OnQueryDragIcon(); /nEK|.j  
  virtual void OnCancel(); UWdqcOr  
  afx_msg void OnAbout();  UF@.  
  afx_msg void OnBrowse(); jaMpi^C  
  afx_msg void OnChange(); m~&>+q ^7  
 //}}AFX_MSG ` M-  
 DECLARE_MESSAGE_MAP() M. _5mZ{  
}; llCE}Vdh  
#endif (&, E}{p9  
x}x)h3e  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +aqQa~}r  
#include "stdafx.h" VW^q|B yB  
#include "Capture.h" ~4c,'k@  
#include "CaptureDlg.h" YfNN&G4_  
#include <windowsx.h> Iv{iJoe;UH  
#pragma comment(lib,"hook.lib") D7c+/H@PF  
#ifdef _DEBUG n*G!=lMji  
#define new DEBUG_NEW C[;7i!Dv  
#undef THIS_FILE F>E_d<m  
static char THIS_FILE[] = __FILE__; brL u~]I  
#endif =c]We:I  
#define IDM_SHELL WM_USER+1 i?)bF!J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u!fZ>kS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6.a>7-K}%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^{NN-  
class CAboutDlg : public CDialog 0XE(vc!  
{ /Wdrpv-%,1  
 public: ,eL&Ner  
  CAboutDlg(); J|cw9u  
  // Dialog Data Cn.dv-  
  //{{AFX_DATA(CAboutDlg) Upm#:i|"  
  enum { IDD = IDD_ABOUTBOX }; ]n$ v ^  
  //}}AFX_DATA 5cl^:Ua  
  // ClassWizard generated virtual function overrides V=+p8nE0  
  //{{AFX_VIRTUAL(CAboutDlg) CM `Q((  
 protected: +.$:ZzH#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [T,Df&  
  //}}AFX_VIRTUAL DYe w6B-  
  // Implementation dLf ;g}W  
 protected: TBHd)BhI.  
  //{{AFX_MSG(CAboutDlg) s,D GFK  
  //}}AFX_MSG H/*i-%]v+(  
  DECLARE_MESSAGE_MAP() ")fgQ3XZ  
}; K5(T7S  
x26 sH5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7mb5z/N  
{ m 7+=w>o  
 //{{AFX_DATA_INIT(CAboutDlg) <&4~Z! O  
 //}}AFX_DATA_INIT 3[~LmA  
} _sHeB7K  
Aiqb*v$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Q0xQx z  
{ Z(J 1A x  
 CDialog::DoDataExchange(pDX); 8"u.GL.  
 //{{AFX_DATA_MAP(CAboutDlg) ?w)A`G_  
 //}}AFX_DATA_MAP i_I`  
} 475jmQ{q  
`"$9L[>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) F[fs^Q6S$  
 //{{AFX_MSG_MAP(CAboutDlg) Kke _?/fT  
 // No message handlers LD,T$"  
 //}}AFX_MSG_MAP E,4*a5Fi  
END_MESSAGE_MAP() }E)t,T>  
s2nZW pIy  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) eE{ 2{C  
: CDialog(CCaptureDlg::IDD, pParent) Y2+YmP*z`  
{ fo I:`]2"*  
 //{{AFX_DATA_INIT(CCaptureDlg) V0gu0+u~R  
  m_bControl = FALSE; W5&KmA  
  m_bAlt = FALSE; (c[DQSj  
  m_bShift = FALSE; <F| S<\Y.  
  m_Path = _T("c:\\"); *Ym+xu_5  
  m_Number = _T("0 picture captured."); ?1X7jn`,+  
  nCount=0; Wx8;+!2Q/  
  bRegistered=FALSE; BJsN~` =r  
  bTray=FALSE; t4-0mNBZt$  
 //}}AFX_DATA_INIT fY|vq amA;  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 FwQGxGZ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); X,K`]hb*0_  
} pf3-  
 ww\2  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  mNX0BZ  
{ 1DF8-|+  
 CDialog::DoDataExchange(pDX); \<b42\a}  
 //{{AFX_DATA_MAP(CCaptureDlg) dBW4%Zh  
  DDX_Control(pDX, IDC_KEY, m_Key); 4_4|2L3  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); G2J4N2hu  
  DDX_Check(pDX, IDC_ALT, m_bAlt); FWS!b!#,N  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Ej`G(  
  DDX_Text(pDX, IDC_PATH, m_Path); RLDu5  
  DDX_Text(pDX, IDC_NUMBER, m_Number); t1aKq)?  
 //}}AFX_DATA_MAP ay=f1<a  
} #;'*W$Wk2  
h:vI:V[/X  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ?;go5f+X  
//{{AFX_MSG_MAP(CCaptureDlg) v)'Uoe"R%  
 ON_WM_SYSCOMMAND() iyMoLZ5  
 ON_WM_PAINT() }oii|=,#^  
 ON_WM_QUERYDRAGICON() y$L&N0z  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /j(<rz"j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w1= f\  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ITjg]taD  
//}}AFX_MSG_MAP "%=K_WJ?  
END_MESSAGE_MAP() 4o@^._-R  
yLt>OA<X  
BOOL CCaptureDlg::OnInitDialog() VO*fC  
{ ]Vf2Mn=]"  
 CDialog::OnInitDialog(); SLud}|f;o  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9cMMkOM J  
 ASSERT(IDM_ABOUTBOX < 0xF000); (HeIO  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :NWrbfz  
 if (pSysMenu != NULL) 83{v_M  
 { ?:RWHe.P  
  CString strAboutMenu; rrZ'Dz  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 8p~|i97W]!  
  if (!strAboutMenu.IsEmpty()) By0Zz  
  { 8noo^QO  
   pSysMenu->AppendMenu(MF_SEPARATOR); xllmF)]*Y  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7L!q{%}  
  } )/t=g  
 } Uql7s:!,U  
 SetIcon(m_hIcon, TRUE); // Set big icon RD*.n1N1  
 SetIcon(m_hIcon, FALSE); // Set small icon %#7^b=;=  
 m_Key.SetCurSel(0); AT I2  
 RegisterHotkey(); "3NE%1T  
 CMenu* pMenu=GetSystemMenu(FALSE); $H7T|`WI.,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a3BlydSlf  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wpm $?X  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5%R$7>`Z  
 return TRUE; // return TRUE unless you set the focus to a control *&W1|Qkg_  
} BctU`.  
zMAlZ[DN  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |JCn=v@  
{ P/dT;YhL  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "J3n_3+  
 { "ODs.m oq  
  CAboutDlg dlgAbout; &4Y@-;REt  
  dlgAbout.DoModal(); [b@9V_  
 } w;T?m,"  
 else ~ponYc.Y  
 { *lp{,  
  CDialog::OnSysCommand(nID, lParam); PvS\  
 } 1?T^jcny:M  
} |_wbxdq  
`"j_]  
void CCaptureDlg::OnPaint() Iy {&T#e"  
{ (t-JGye>  
 if (IsIconic()) mRY~)< !4&  
 { #^< Rx{  
  CPaintDC dc(this); // device context for painting EeS VY  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); &?yVLft  
  // Center icon in client rectangle irzWk3@:  
  int cxIcon = GetSystemMetrics(SM_CXICON); o!|TCwt  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,"4  
  CRect rect; 62J -)~_  
  GetClientRect(&rect); BO-=X 78f@  
  int x = (rect.Width() - cxIcon + 1) / 2; {;Y2O.lV  
  int y = (rect.Height() - cyIcon + 1) / 2; FtxmCIVIV~  
  // Draw the icon OYNPZRu  
  dc.DrawIcon(x, y, m_hIcon); %%k`+nK~  
 } k&\ 6SK/  
 else lnRbvulH  
 { MIWI0bnf  
  CDialog::OnPaint(); cvQ MZ,p  
 } 4w0Y(y  
} P/hIJV[  
\BxE0GGky  
HCURSOR CCaptureDlg::OnQueryDragIcon() v8o{3wJ  
{ (]p,Z <f  
 return (HCURSOR) m_hIcon; ,;-55|o\V  
} ]abox%U=%  
_l!TcH+e  
void CCaptureDlg::OnCancel() +;wu_CQu  
{ \^rAH@  
 if(bTray) M\ {W&o1!  
  DeleteIcon(); c{s%kVOzg  
  CDialog::OnCancel(); H-1y2AQ  
} 1t7S:IZ  
?3:xR_VWZu  
void CCaptureDlg::OnAbout() E;^~}  
{ gdyP,zMD7  
 CAboutDlg dlg; tV,Y38e  
 dlg.DoModal(); MUU9IMFJ  
} dzPwlCC%-  
+MP`iuDO  
void CCaptureDlg::OnBrowse() EBPm7{&0|  
{ hM @F|t3  
 CString str; ,V2,FoJ 9  
 BROWSEINFO bi; r(QjVLjj`k  
 char name[MAX_PATH]; rN%aP-sa<  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); SB' $?Kh  
 bi.hwndOwner=GetSafeHwnd(); }J&[Uc  
 bi.pszDisplayName=name; N!&$fhY)  
 bi.lpszTitle="Select folder"; Y!|* `FII  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @I^LmB9*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <kr%ylhIu  
 if(idl==NULL) rwUKg[ 1N  
  return; 2,O;<9au<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q+UqLass  
 str.ReleaseBuffer(); lnoK.Vk9,  
 m_Path=str; Ju"*>66  
 if(str.GetAt(str.GetLength()-1)!='\\') J_^Ml)@iy  
  m_Path+="\\"; e$+?l~  
 UpdateData(FALSE); Q(Dp116  
} L0H kmaH  
N\OeWjA F  
void CCaptureDlg::SaveBmp() &\, ZtaB  
{ H%:~&_D  
 CDC dc; 8'B   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1]uHaI(  
 CBitmap bm; _n;V iQMu  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3G7Qo  
 int Height=GetSystemMetrics(SM_CYSCREEN); OK}+:Y  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Zn`vL52_  
 CDC tdc; HXTZ`'Rv  
 tdc.CreateCompatibleDC(&dc); W\?_o@d  
 CBitmap*pOld=tdc.SelectObject(&bm); h)qapC5z,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); sKT GZA  
 tdc.SelectObject(pOld); )0I;+9:D=  
 BITMAP btm; '8 ~E  
 bm.GetBitmap(&btm); 71?>~PnbH}  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; L-lDvc?5c  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Z?^~f}+  
 BITMAPINFOHEADER bih; jJF(*D  
 bih.biBitCount=btm.bmBitsPixel; Qr4c':8  
 bih.biClrImportant=0; Gdd lB2L)x  
 bih.biClrUsed=0; {-( B  
 bih.biCompression=0; =gb.%a{R  
 bih.biHeight=btm.bmHeight; Ol9'ZB|R  
 bih.biPlanes=1; wtDy-H n  
 bih.biSize=sizeof(BITMAPINFOHEADER); ` qqUuFMM  
 bih.biSizeImage=size; C=6Vd  
 bih.biWidth=btm.bmWidth; BEkxH.   
 bih.biXPelsPerMeter=0; ]_yk,}88d  
 bih.biYPelsPerMeter=0; `4'['x  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [D=3:B&f  
 static int filecount=0; )o<rU[oD]C  
 CString name; :N<ZO`l?  
 name.Format("pict%04d.bmp",filecount++); 7Xu.z9y  
 name=m_Path+name; 6+9inWTT(  
 BITMAPFILEHEADER bfh; 4Y[uqn[  
 bfh.bfReserved1=bfh.bfReserved2=0;  S oY=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _T 5ZL  
 bfh.bfSize=54+size; bt/u^E  
 bfh.bfOffBits=54; }-:s9Lt  
 CFile bf; OA?? fb, b  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ BiQ7r=Dd.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); MXbt`]`_  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0\*6U H  
  bf.WriteHuge(lpData,size); E5P?(5Nv  
  bf.Close(); ]R8}cbtU  
  nCount++; ROr..-[u  
 } P d@y+|  
 GlobalFreePtr(lpData); *t'q n   
 if(nCount==1) TM8WaH   
  m_Number.Format("%d picture captured.",nCount); t7#C&B  
 else 8lo /BGxS>  
  m_Number.Format("%d pictures captured.",nCount); {BBL`tg60  
  UpdateData(FALSE); Azun"F_f  
} C~.7m-YW  
W[]N.d7G  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 5sD\4g)HK  
{ _N5$>2  
 if(pMsg -> message == WM_KEYDOWN) C%8jWc  
 { ?\ C7.of  
  if(pMsg -> wParam == VK_ESCAPE) uX-]z3+  
   return TRUE; U[1Ir92:  
  if(pMsg -> wParam == VK_RETURN) oW*e6"<R7  
   return TRUE; 7dXR/i\  
 } .R/`Y)4  
 return CDialog::PreTranslateMessage(pMsg); |@]`" k  
} }%B^Vl%ZZ  
~G!>2 +L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) F^Yt\V~T  
{ 15i8) 4h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ `Trpv$   
  SaveBmp(); 7tgn"wK  
  return FALSE; DS,"^K  
} }5Yd:%u5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jFBLElE  
 CMenu pop; 'OKDB7Ni  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); xeqAFq=9?  
 CMenu*pMenu=pop.GetSubMenu(0); ho#]i$b}f2  
 pMenu->SetDefaultItem(ID_EXITICON); >z*2Og#1  
 CPoint pt; , 4Vr,?"EO  
 GetCursorPos(&pt); _q >>]{5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); IG?044Y  
 if(id==ID_EXITICON) `Z*k M VN  
  DeleteIcon();  hfpSxL  
 else if(id==ID_EXIT) D}1Z TX_  
  OnCancel(); !JtVp&?  
 return FALSE; __\Tv>Y  
} V 45\.V  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); A+Nf]([  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) U$j*{`$4  
 AddIcon(); W8:?y*6  
 return res; x j6-~<  
} <QGf9{m  
O mkl|l9  
void CCaptureDlg::AddIcon() wV- kB4^4  
{ /79_3;^  
 NOTIFYICONDATA data; 9*gD;)!  
 data.cbSize=sizeof(NOTIFYICONDATA); PT7L65  
 CString tip; E\2|  
 tip.LoadString(IDS_ICONTIP); )J&1uMp{  
 data.hIcon=GetIcon(0); pCOr{I\  
 data.hWnd=GetSafeHwnd(); =k#SQ/@  
 strcpy(data.szTip,tip); L 0?-W%$>  
 data.uCallbackMessage=IDM_SHELL; L Of0_g/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f S50  
 data.uID=98; KUG\C\z6=  
 Shell_NotifyIcon(NIM_ADD,&data);  l`x;Og>a  
 ShowWindow(SW_HIDE); nmlQ-V-  
 bTray=TRUE; : [o0Va2 d  
} k23*F0Dv  
Vk/CV2  
void CCaptureDlg::DeleteIcon() mAkR<\?iTF  
{ *Z*4L|zT  
 NOTIFYICONDATA data; d5gYJ/Qv  
 data.cbSize=sizeof(NOTIFYICONDATA); ?ic7M  
 data.hWnd=GetSafeHwnd(); 1{B^RR.  
 data.uID=98; Fj<#*2{]B  
 Shell_NotifyIcon(NIM_DELETE,&data); "G\OKt'Z  
 ShowWindow(SW_SHOW); HCHZB*r[  
 SetForegroundWindow(); Fw!CssW  
 ShowWindow(SW_SHOWNORMAL); @}:}7R6  
 bTray=FALSE; nd(O;XBI  
} Ay'2! K,I  
u(B0X=B  
void CCaptureDlg::OnChange() V_JM@VN}Kk  
{ t0XM#9L  
 RegisterHotkey(); *i#m5f}  
} \M>}-j`v  
3-4' x2   
BOOL CCaptureDlg::RegisterHotkey() o:u *E  
{ :Hdn&a i  
 UpdateData(); 2x-67_BHY=  
 UCHAR mask=0; Wu]D pe  
 UCHAR key=0; b&s"/Y89  
 if(m_bControl) Vt-D8J\A 0  
  mask|=4; kIS_ 6!  
 if(m_bAlt) $ BV4i$  
  mask|=2; :hYV\8 $  
 if(m_bShift) hO3>Gl5<  
  mask|=1; z_vFf0  
  key=Key_Table[m_Key.GetCurSel()]; %jKbRiz1u  
 if(bRegistered){ $qk2!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2 F3U,}  
  bRegistered=FALSE; |) {)w`  
 } s u]x  
 cMask=mask; J1kG'cH05  
 cKey=key; )8Defuxk  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +~lZ]a7k  
 return bRegistered; i9?$BZQ[R  
} d)48m}[:  
u9;3Xn8  
  四、小结 WA}'[h   
i8<5|du&?  
  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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