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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: lWFm>DiLY  
  R+Rb[,m  
  一、实现方法 7??j}ob>  
787}s`,}  
  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: $oIGlKc:L  
}b>e lz  
#pragma data_seg("shareddata") 3ZqtIQY`  
HHOOK hHook =NULL; //钩子句柄 T_qh_L3  
UINT nHookCount =0; //挂接的程序数目 :Ek3]`q#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 KvEZbf 3f  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 tp b(.`G  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey PU%WpI.w  
static int KeyCount =0; .-: 6L2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 'x= y:0A  
#pragma data_seg() 9|hPl-. .W  
)Ju$PrO  
  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。 a;0$fRy  
u_S>`I  
  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: 8;P_KRaE  
(<#Ns W!z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR nmrdqSV  
cKey,UCHAR cMask) mWU*}-M  
{ 7h.:XlUm|  
 BOOL bAdded=FALSE; $]iRfXv,l!  
 for(int index=0;index<MAX_KEY;index++){ 0'Qo eFKG  
  if(hCallWnd[index]==0){ 4?e7s.9N  
   hCallWnd[index]=hWnd; }u'O<d~z?  
   HotKey[index]=cKey; &?7+8n&+  
   HotKeyMask[index]=cMask; 2@ f E!  
   bAdded=TRUE; cWL 7gv\|  
   KeyCount++; +luW=j0V  
   break; HltURTbI  
  } %LZf= `:(  
 } L QP4#7  
 return bAdded; E- rXYNfy  
} f5QJj<@  
//删除热键 agW#"9]WM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Gnmxp%&}P|  
{ 7ip(-0  
 BOOL bRemoved=FALSE; ]#oqum@Yf1  
 for(int index=0;index<MAX_KEY;index++){ } g[(h=Qi  
  if(hCallWnd[index]==hWnd){ #-u?+Nk/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }[I|oV5*+&  
    hCallWnd[index]=NULL; pxs`g&3yd  
    HotKey[index]=0; REwZ41   
    HotKeyMask[index]=0; Fh$Xcz~i  
    bRemoved=TRUE; j!<RY>u  
    KeyCount--; k`Ifd:V.y  
    break; &tE#1<k  
   } FzGla})  
  } ur2`.dY>3"  
 } D>Ph))QI  
 return bRemoved; ZX!u\O|w  
} .EUOKPK4W  
VR9C< tMSi  
nANoy6z:  
  DLL中的钩子函数如下: {CR'Z0  
*n %J#[e(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -!]dU`:(X  
{ tJ9i{TS  
 BOOL bProcessed=FALSE; Ka\%kB>*`  
 if(HC_ACTION==nCode) _'E,g@  
 { #wZ:E,R  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *u%4]q  
   switch(wParam) ?pv}~>  
   {  TBYRY)~f  
    case VK_MENU: ~IKPi==@,  
     MaskBits&=~ALTBIT; PDcZno?  
     break; #ab=]}2W_g  
    case VK_CONTROL: V/G'{ q  
     MaskBits&=~CTRLBIT; =/rIXReY  
     break; \ oIVE+L/P  
    case VK_SHIFT: AhARBgf<  
     MaskBits&=~SHIFTBIT; ivbuS-f =r  
     break; -)tu$W*  
    default: //judge the key and send message ?q <"!U|e  
     break; FPu"/4v&  
   } ODH@ /  
   for(int index=0;index<MAX_KEY;index++){ v&B*InR?+  
    if(hCallWnd[index]==NULL) wK CHG/W  
     continue; HX{O@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5u\si4BL{  
    { T }X#I'Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); rQbL86+  
     bProcessed=TRUE; ,"u-V<>6O  
    } j#b?P=|l  
   } i(JBBE"  
  } Q+[e)YO)  
  else if((lParam&0xc000ffff)==1){ //有键按下 1Q6WpS  
   switch(wParam) d"|XN{  
   { pCNihZ~  
    case VK_MENU: (@dh"=Lt\  
     MaskBits|=ALTBIT; ~:f9,  
     break; B8_ w3;x  
    case VK_CONTROL: tqE LF  
     MaskBits|=CTRLBIT; ]}cai1  
     break; 5o5y3ibQ  
    case VK_SHIFT: 9 I> 3p4]  
     MaskBits|=SHIFTBIT;  XGEAcN  
     break; ZgLO[Bj  
    default: //judge the key and send message +n]U3b  
     break; {b>tX)Tep  
   } 2i4FIS|z0  
   for(int index=0;index<MAX_KEY;index++){ m u(HNj  
    if(hCallWnd[index]==NULL) \CL |=8[2  
     continue; N G1]!Vz5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sD.bBz  
    { h FP$MFab  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hNXPm~OK\  
     bProcessed=TRUE; qu8i Jq  
    } ]?xF'3#  
   } . x~tEe  
  } 3KfZI&g  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Z bxd,|<|  
   for(int index=0;index<MAX_KEY;index++){ ]6</{b  
    if(hCallWnd[index]==NULL) gqJ&Q t#f  
     continue; <oPo?r|oM|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9tXLC|yl?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rSB"0 W7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ,-t3gc1~X  
   } cn=~}T@~Z  
  } `|i #)  
 } %WCA?W0:4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yyrCO"eh  
} O%A:2Y79  
7(eWBJfTo  
  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: /Yc!m$uCW  
@ h([c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ()K%Rn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |t|+pBB  
xzy7I6X  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ._=Pa)T  
^M  PU?k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ? 8S0  
{ on(F8%]zE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |h*H;@$  
 { T%KZV/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !~m)_Q5?~  
  SaveBmp(); iquB]z'  
  return FALSE; ._-^ 58[  
 } C!B2 .:ja  
 …… //其它处理及默认处理 vd SV6p.d  
} f$iv+7<B^  
~kYUp5f  
4t|g G`QW7  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 #wNksh/J^  
9cWl/7;zXO  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 22`W*e@6h  
AR]y p{NS  
  二、编程步骤 oU$Niw9f  
IBf&'/ 8\  
  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"; @YMef `T:  
,4jkTQ*@2  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; .Frc:Y{  
v6HBO#F'V{  
  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; K!5QFO4  
qWGnIPk  
  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; IaH8#3+a  
_,=A\C_b@  
  5、 添加代码,编译运行程序。  ^vYH"2  
9loWh5_1Z  
三、程序代码  3p"VmO  
vmvk  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL LgjL+w19  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) V2,54YE  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ L|qQZ=  
#if _MSC_VER > 1000 =_\5h=`Yx  
#pragma once 7UejK r  
#endif // _MSC_VER > 1000 4cRF3$a md  
#ifndef __AFXWIN_H__  VljAAt  
#error include 'stdafx.h' before including this file for PCH bA@!0,m  
#endif BdG~y1%:  
#include "resource.h" // main symbols ,icgne1j  
class CHookApp : public CWinApp _Buwz_[&  
{ xM8}Xo  
 public: iN"kv   
  CHookApp(); 1Zx|SBF  
  // Overrides VJDF/)X3$  
  // ClassWizard generated virtual function overrides `L`qR,R  
  //{{AFX_VIRTUAL(CHookApp) C$vKRg\o  
 public: Sav]Kxq{  
  virtual BOOL InitInstance(); -ZlBg~E  
  virtual int ExitInstance(); &dh%sFy  
  //}}AFX_VIRTUAL d=o|)kV  
  //{{AFX_MSG(CHookApp) S 3Tp__  
  // NOTE - the ClassWizard will add and remove member functions here. gD3s,<>o  
  // DO NOT EDIT what you see in these blocks of generated code ! NKvBNf|D  
  //}}AFX_MSG K}tl,MMU  
  DECLARE_MESSAGE_MAP() ah1d0e P  
}; 7*^-3Tt83  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Y;8Ys&/t  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  U":hJ*F)  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SG_^Rd9 D  
BOOL InitHotkey(); uM h[Ht^.  
BOOL UnInit(); NeAkJG=<  
#endif L3JFQc/oh~  
9 [v=`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. <+o-{{E[  
#include "stdafx.h" CL.JalR`b  
#include "hook.h" z8_m<uewz  
#include <windowsx.h> 'iA#lKG  
#ifdef _DEBUG 0vuL(W8)  
#define new DEBUG_NEW =.(yOUI  
#undef THIS_FILE 7yD=~l\Bbs  
static char THIS_FILE[] = __FILE__; (4cWq!ax<$  
#endif )uC],CbW{  
#define MAX_KEY 100 <cNXe4(  
#define CTRLBIT 0x04 7K,Quq.%+  
#define ALTBIT 0x02 )Fx"S.Ok  
#define SHIFTBIT 0x01 ^e:C{]S=  
#pragma data_seg("shareddata") I_6NY,dF  
HHOOK hHook =NULL; {STOWuY  
UINT nHookCount =0; Z"#eN(v.N  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey {a^A-Xh[u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #"-?+F=rk  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey D9,609w  
static int KeyCount =0; BZejqDr*  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift +KgoLa  
#pragma data_seg() Gdmh#pv  
HINSTANCE hins; &[:MTK?x!  
void VerifyWindow(); BZq_om6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) d~F`q7F'?]  
//{{AFX_MSG_MAP(CHookApp) =M'M/vKD  
// NOTE - the ClassWizard will add and remove mapping macros here. J ^gtSn^  
// DO NOT EDIT what you see in these blocks of generated code! z%$ E6Im  
//}}AFX_MSG_MAP QA>(}u\+  
END_MESSAGE_MAP() W&CQ87b  
(;v)0&h  
CHookApp::CHookApp() )]WWx-Uf'  
{ KiYO,nD;\  
 // TODO: add construction code here, w}No ^.I*4  
 // Place all significant initialization in InitInstance kR$>G2$!  
} nv&uhu/q  
.w2QiJ  
CHookApp theApp; ]T|9>o!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DTmv2X  
{ U<,@u,_Ja  
 BOOL bProcessed=FALSE; {6{y"8  
 if(HC_ACTION==nCode) wI.i\ S  
 { Q|QVm,m  
  if((lParam&0xc0000000)==0xc0000000){// Key up io :g ]g  
   switch(wParam) <i{O\K]9  
   {  }/~%Ysl  
    case VK_MENU: ,: g.B\'Q  
     MaskBits&=~ALTBIT; 'F%4[3a$\n  
     break; Dy6uWv,P  
    case VK_CONTROL: !Ic;;<  
     MaskBits&=~CTRLBIT; +Go(y S  
     break; _G s*4:  
    case VK_SHIFT: Gr9/@U+  
     MaskBits&=~SHIFTBIT; Vp8t8X1`  
     break; 3jF#f'*  
    default: //judge the key and send message RtVy^~=G  
     break; ?#8',:  
   } v{{Cj83S+  
   for(int index=0;index<MAX_KEY;index++){ z'@j9vT  
    if(hCallWnd[index]==NULL) H QHFD0hv  
     continue; N]n]7(e+0C  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i0F.c\  
    { 50!/%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); h(}$-'g  
     bProcessed=TRUE; l`lo5:w  
    } OLXkiesK{  
   } zNSix!F  
  } <p@c %e,_  
  else if((lParam&0xc000ffff)==1){ //Key down YnnpgR.  
   switch(wParam) A ?"(5da.  
   { q6A!xQs<  
    case VK_MENU:  !sda6?&  
     MaskBits|=ALTBIT; a<X8l^Ln  
     break; 6OYXcPW'  
    case VK_CONTROL: Pn@k)g  
     MaskBits|=CTRLBIT; y*2R#jTA  
     break; IOA"O9;  
    case VK_SHIFT: 2 qRX A  
     MaskBits|=SHIFTBIT; /lAB  
     break; shW$V93<  
    default: //judge the key and send message 5,=Yi$x  
     break; `@GqD  
   } RZ)sCR  
   for(int index=0;index<MAX_KEY;index++) O+;0|4V%  
   { Zu(eYH=Q  
    if(hCallWnd[index]==NULL) {zoUU  
     continue; }Ictnb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) H <CsB  
    { ?]%JQ]Gf*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); SQ#6~zxl  
     bProcessed=TRUE; d_9Fc" C~  
    } Oq"(oNG@  
   } kN uDoo]z  
  } iO=xx|d  
  if(!bProcessed){ }HS:3Dt  
   for(int index=0;index<MAX_KEY;index++){ yu"Ii-9z  
    if(hCallWnd[index]==NULL) r}) 2-3ZA9  
     continue;  f])?Gw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) kTQ:k }%B  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0 eZfHW&  
   } @k~?h=o\b  
  } XfA3Ez,}  
 } Hv%(9)-8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); f uojf+i  
} U -~%-gFC  
g+/%r91hZ  
BOOL InitHotkey() R_h(Z{d  
{ /=Ug}%.  
 if(hHook!=NULL){ o D;  
  nHookCount++; Rde_I`Ru  
  return TRUE; KtJE  
 } GkMNV7"m  
 else b~06-dk1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); xrx{8pf  
  if(hHook!=NULL) RAKQ+Y"nl  
   nHookCount++;  l|`FW  
  return (hHook!=NULL); hTI8hh  
} bGRI^ [8#+  
BOOL UnInit() X:-X3mV9{  
{ z.1 6%@R  
 if(nHookCount>1){ Qo  
  nHookCount--; b{)('C$  
  return TRUE; i]GBu  
 } Y~1}B_  
 BOOL unhooked = UnhookWindowsHookEx(hHook); i=_leC)rl  
 if(unhooked==TRUE){ 1=#r$H  
  nHookCount=0; Z_' %'&Y  
  hHook=NULL; !mBsDn(J  
 } L1BpkB  
 return unhooked; t )Z2"_5  
} x$CpUy{6  
Td[w<m+p<P  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z{#^lhHx  
{ cNC\w%  
 BOOL bAdded=FALSE; 2a.NWJS  
 for(int index=0;index<MAX_KEY;index++){ el!Bi>b9c!  
  if(hCallWnd[index]==0){ !~UI~-i'  
   hCallWnd[index]=hWnd; Te'^O,C)y$  
   HotKey[index]=cKey; q`1t*<sk  
   HotKeyMask[index]=cMask; <6/XE@"   
   bAdded=TRUE; N(Y9FD;H  
   KeyCount++; {N5g52MN  
   break; 5K'EuI)  
  } ?3SlvKI}H`  
 } ]+0-$t7Y  
 return bAdded; W/oRt<:E  
} };9dd3X  
3+A 0O%0*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u-UUF  
{ b("CvD8  
 BOOL bRemoved=FALSE; SJU93n"G/  
 for(int index=0;index<MAX_KEY;index++){ $pk3d+0B  
  if(hCallWnd[index]==hWnd){ !P@u4FCs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `RGZ-Q{_  
    hCallWnd[index]=NULL; u;J=g  
    HotKey[index]=0; p5F[( H|9  
    HotKeyMask[index]=0; q,nj|9z V  
    bRemoved=TRUE; W}L =JJo},  
    KeyCount--; S-2xe?sb  
    break; 4L!{U@ '  
   } `m2F.^qrr  
  } 6/4OFvL1  
 } &tMvs<q,  
 return bRemoved; .6O>P2m]a_  
} p00\C  
{h9#JMIA  
void VerifyWindow() oeIB1DaI  
{ 7h&xfrSrD  
 for(int i=0;i<MAX_KEY;i++){ }QJE9;<e  
  if(hCallWnd!=NULL){ ,6t0w|@-k  
   if(!IsWindow(hCallWnd)){ d0-}Xl  
    hCallWnd=NULL; 8w2+t>?  
    HotKey=0; Gw+z8^|C&}  
    HotKeyMask=0; ?\vJ8H[bD  
    KeyCount--; !@VmaAT  
   } -8 &f=J)  
  } >5^Z'!Z"  
 } s ^)W?3t]  
} )%^oR5W  
ev8 E.ehD  
BOOL CHookApp::InitInstance() ~S-x-cZ  
{ 7ZZSAI  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ?Fi-,4  
 hins=AfxGetInstanceHandle(); fd+kr#  
 InitHotkey(); Z]SCIU @+  
 return CWinApp::InitInstance(); ^S<Z'S  
} vO0ql  
:eIB K  
int CHookApp::ExitInstance() 7FMHz.ZRE  
{ ir]uFOj  
 VerifyWindow(); (Mtc&+n{  
 UnInit(); }Bc6:a  
 return CWinApp::ExitInstance(); .mok.f<G_m  
} /AMtT%91  
&)bar.vw/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \!SC;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *\joaw  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ q>Q|:g&:  
#if _MSC_VER > 1000  bM-Y4[  
#pragma once e9%6+ 9Y  
#endif // _MSC_VER > 1000 8tdUnh%/  
@'}X&TN<a  
class CCaptureDlg : public CDialog " g_\W  
{ p O: EJ  
 // Construction +i)1 jX<  
 public: {Ua5bSbh  
  BOOL bTray; 5X`.2q=d  
  BOOL bRegistered; Q]|+Y0y}X  
  BOOL RegisterHotkey(); N`zHe*=[~  
  UCHAR cKey; 8L|C&Ymj  
  UCHAR cMask; R#T6I i  
  void DeleteIcon(); ~Yr.0i.W  
  void AddIcon(); . }=;]=  
  UINT nCount; G4RsH/  
  void SaveBmp(); o&CvjE  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor @C!q S7k)  
  // Dialog Data |2oB3 \)/  
  //{{AFX_DATA(CCaptureDlg) mYy3KqYu  
  enum { IDD = IDD_CAPTURE_DIALOG }; u5,IH2BU  
  CComboBox m_Key; d9^=#ot  
  BOOL m_bControl; BFEo:!'F  
  BOOL m_bAlt; ~z aV.3#  
  BOOL m_bShift; *}v'y{;  
  CString m_Path; _n_i*p '2  
  CString m_Number; WYh7Y  
  //}}AFX_DATA QU#/(N(U#T  
  // ClassWizard generated virtual function overrides ~z'0~3  
  //{{AFX_VIRTUAL(CCaptureDlg) 3$kZu  
 public: 4 B> l|%  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .9ROa#7U;n  
 protected: "Km`B1f`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /0\pPc*kA{  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); |aVv Lz  
  //}}AFX_VIRTUAL DMf9wB  
  // Implementation 6@$[x* V  
 protected: _E "[%  
  HICON m_hIcon; m0#hG x  
  // Generated message map functions '+eP%Y[W%  
  //{{AFX_MSG(CCaptureDlg) Zn^E   
  virtual BOOL OnInitDialog(); x``!t>)O  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); t^[{8,N  
  afx_msg void OnPaint(); ~ACB #D%  
  afx_msg HCURSOR OnQueryDragIcon(); r'!l` gm,S  
  virtual void OnCancel(); D H.ljGb  
  afx_msg void OnAbout(); h!Q >h7  
  afx_msg void OnBrowse(); _9-Ajv  
  afx_msg void OnChange();  AH} nTm  
 //}}AFX_MSG Ltj}>.+  
 DECLARE_MESSAGE_MAP() @2u<Bh}}  
}; O]Hg4">f  
#endif eGE%c1H9a  
B8nXWi  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file iIT<{m&`  
#include "stdafx.h" c]LH.  
#include "Capture.h" *H$nydQ:  
#include "CaptureDlg.h" V|D;7  
#include <windowsx.h> 4H,DG`[Mo  
#pragma comment(lib,"hook.lib") 0N}5sF  
#ifdef _DEBUG QZfPd\Q5  
#define new DEBUG_NEW 63f/-64?7  
#undef THIS_FILE \x+DEy'4;5  
static char THIS_FILE[] = __FILE__; lt*k(JD  
#endif ]@f6O *&=  
#define IDM_SHELL WM_USER+1 +-Dd*yD6<  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IQ_0[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }iC~B}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Y!`?q8z$G  
class CAboutDlg : public CDialog a~%ej.)l  
{ zZxP= c  
 public: U %4g:s  
  CAboutDlg(); f 4 _\F/  
  // Dialog Data Z:*U/_G  
  //{{AFX_DATA(CAboutDlg) (kHR$8GFM  
  enum { IDD = IDD_ABOUTBOX }; kgIWgk%  
  //}}AFX_DATA 8iCI s=06  
  // ClassWizard generated virtual function overrides OBl8kH(b>  
  //{{AFX_VIRTUAL(CAboutDlg) B -KOf  
 protected: ky#6M? \  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Wf?sJ`.%b  
  //}}AFX_VIRTUAL 4A&e+kz&:R  
  // Implementation 5B2,=?+o  
 protected: Fv: %"P^  
  //{{AFX_MSG(CAboutDlg) EH3G|3^xz  
  //}}AFX_MSG W>~%6K>p  
  DECLARE_MESSAGE_MAP() W wE)XE  
}; 9JtvHUkO  
o ,!"E^  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) JA}'d7yEa  
{ '2tEKVb  
 //{{AFX_DATA_INIT(CAboutDlg) +,[3a%c)H  
 //}}AFX_DATA_INIT -7$'* V9$  
} v;Dcq  
qIT{`hX  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) gh}AD1TN]  
{ L1xD$wl  
 CDialog::DoDataExchange(pDX); -FR;:  
 //{{AFX_DATA_MAP(CAboutDlg) `|w#K28t"  
 //}}AFX_DATA_MAP 9vTQ^*b m  
} J){\h-4  
Fdw[CYHz  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Vr1|%*0Tv  
 //{{AFX_MSG_MAP(CAboutDlg) _e_%U<\4  
 // No message handlers #[W[ |m  
 //}}AFX_MSG_MAP $te,\$&}  
END_MESSAGE_MAP() @qDrTH]5  
)R@gnTe  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #<PdZl R  
: CDialog(CCaptureDlg::IDD, pParent) Uq.~3V+u  
{ weV#%6=5\  
 //{{AFX_DATA_INIT(CCaptureDlg) W~F/ZrT3A  
  m_bControl = FALSE; :\J bWj_j  
  m_bAlt = FALSE; 1^#Q/J,  
  m_bShift = FALSE; 5#)<rK  
  m_Path = _T("c:\\"); ,rI |+  
  m_Number = _T("0 picture captured."); ->&VbR)  
  nCount=0; _0["J:s9  
  bRegistered=FALSE; b6Hk20+B;  
  bTray=FALSE; j2 ^T:q[  
 //}}AFX_DATA_INIT ls\E%d  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s~ZFVi-i  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); X9A[  
} 9sj W  
'F?Znd2L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *.c9$`s  
{ 1GE%5  
 CDialog::DoDataExchange(pDX); idS RWa  
 //{{AFX_DATA_MAP(CCaptureDlg) J<#`IaV  
  DDX_Control(pDX, IDC_KEY, m_Key); 5b`xN!c  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); p}DF$k%`  
  DDX_Check(pDX, IDC_ALT, m_bAlt); $A@3ogoS&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >MWpYp  
  DDX_Text(pDX, IDC_PATH, m_Path); CPNN!%-  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *.]E+MYi*  
 //}}AFX_DATA_MAP &9_\E{o%]  
} Z)i1?#  
?  < O  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F2`htM@,  
//{{AFX_MSG_MAP(CCaptureDlg) E:4P1,%01+  
 ON_WM_SYSCOMMAND() zO5u{  
 ON_WM_PAINT() _#D\*0J  
 ON_WM_QUERYDRAGICON() N 3yB1_   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) {/A)t1nL  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) VUC <0WV  
 ON_BN_CLICKED(ID_CHANGE, OnChange) sp Q4m  
//}}AFX_MSG_MAP :n4:@L<%H  
END_MESSAGE_MAP() +#uNQ`1v  
(d'j'U:C  
BOOL CCaptureDlg::OnInitDialog() ;IuK2iDt<  
{ -)O kG#J@  
 CDialog::OnInitDialog(); u:uSsAn0$  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )ehB)X  
 ASSERT(IDM_ABOUTBOX < 0xF000); f;Bfh3  
 CMenu* pSysMenu = GetSystemMenu(FALSE); a][pTC\rb  
 if (pSysMenu != NULL) b4)*<Zp`  
 { nKh%E-c  
  CString strAboutMenu; qbU1qF/  
  strAboutMenu.LoadString(IDS_ABOUTBOX); :#\B {)(  
  if (!strAboutMenu.IsEmpty()) |J<pLz  
  { RZ|HwYG  
   pSysMenu->AppendMenu(MF_SEPARATOR); MLt'YW^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :PD`PgQ  
  } {yHB2=nI  
 } =(.mf  
 SetIcon(m_hIcon, TRUE); // Set big icon up &NCX  
 SetIcon(m_hIcon, FALSE); // Set small icon OY^n0Zof,  
 m_Key.SetCurSel(0); "y~muE:.  
 RegisterHotkey(); {\svV 0)~  
 CMenu* pMenu=GetSystemMenu(FALSE); H-_^TB  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); S!jF:Uc  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); hJ;f1dZ7}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); UH 47e  
 return TRUE; // return TRUE unless you set the focus to a control X;OsH  
} P /c Q1  
`J>E9p<  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) cuQ7kECV  
{ "%oH@ =  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) d; mmM\3]  
 { %tzN@  
  CAboutDlg dlgAbout; ~?AC:  
  dlgAbout.DoModal(); T_@[k  
 } S,*{q(   
 else ka5#<J7<p  
 { E!zd(  
  CDialog::OnSysCommand(nID, lParam); YN,y0t/cQ  
 } t} *l?$`  
} @<D'-mMt  
z(g%ue\  
void CCaptureDlg::OnPaint() t] r,9df'  
{ xSpMyXrQ  
 if (IsIconic()) KTG:I@|C  
 { aBXYri  
  CPaintDC dc(this); // device context for painting 2BoFyL*  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); r{t. c?/  
  // Center icon in client rectangle Q`.'-iq  
  int cxIcon = GetSystemMetrics(SM_CXICON); E4sn[DO  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7?6xPKQ)H  
  CRect rect; 9W{,=.%MX$  
  GetClientRect(&rect); %f3c7\=C  
  int x = (rect.Width() - cxIcon + 1) / 2; |av*!i5Q  
  int y = (rect.Height() - cyIcon + 1) / 2; .S~@BI(|<  
  // Draw the icon m b%C}8D  
  dc.DrawIcon(x, y, m_hIcon); F&=I7i  
 } iYk':iv}S  
 else c3=-Mq9Q  
 { .:w#&yM [U  
  CDialog::OnPaint(); 99<4t$KH  
 } <Z{vC  
} iuiAK  
P@qMJ}<j  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?qju DD  
{ =WIE>*3[  
 return (HCURSOR) m_hIcon; R=!kbBK>\  
} R'rTE  
%tT"`%(+  
void CCaptureDlg::OnCancel() -glugVq  
{ *8z"^7?^=  
 if(bTray) L ;6b+I  
  DeleteIcon(); ^#]c0  
  CDialog::OnCancel(); iJFr4o/R  
} >BBl 7  
eymi2-a<  
void CCaptureDlg::OnAbout() +`ai1-vw  
{ 3pB}2]  
 CAboutDlg dlg; ?N:B  
 dlg.DoModal(); 2b5#PcKa  
} $30oc Tt{  
X4a^m w\"  
void CCaptureDlg::OnBrowse() *P`v^&  
{ 2z4<N2! M  
 CString str; X:>$ 8^gS  
 BROWSEINFO bi; #,G1R7  
 char name[MAX_PATH]; Bp :~bHf  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); uS~#4;R   
 bi.hwndOwner=GetSafeHwnd(); 2gt+l?O<PS  
 bi.pszDisplayName=name; W Zq,()h  
 bi.lpszTitle="Select folder"; nTPB,QE<  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]nQ+nH  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1pK6=-3w3  
 if(idl==NULL) </= CZy5w  
  return; >)Ioo$B  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); f-4.WW2FN  
 str.ReleaseBuffer(); $_sYfU9  
 m_Path=str; z Ct\o  
 if(str.GetAt(str.GetLength()-1)!='\\') >L gVj$Z  
  m_Path+="\\"; +Gow5-(  
 UpdateData(FALSE); !DPF7x(-{  
} ) V36t{  
Z0$] tS  
void CCaptureDlg::SaveBmp() .oEbEs  
{ u^=`%)  
 CDC dc; \6o\+OQk  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); LEZ&W ;bCo  
 CBitmap bm; /4*WDiH  
 int Width=GetSystemMetrics(SM_CXSCREEN); S/.^7R7{f  
 int Height=GetSystemMetrics(SM_CYSCREEN); " !-Kd'V  
 bm.CreateCompatibleBitmap(&dc,Width,Height); !;v.>.lw  
 CDC tdc; e`iEy=W  
 tdc.CreateCompatibleDC(&dc); Pz%~ST  
 CBitmap*pOld=tdc.SelectObject(&bm); D<bI2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); )T1iN(Z  
 tdc.SelectObject(pOld); *)'Vvu<  
 BITMAP btm; +6l]]*H  
 bm.GetBitmap(&btm); px=]bALU  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; s9O2k}]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (u&`Ij9  
 BITMAPINFOHEADER bih; [ ny6W9  
 bih.biBitCount=btm.bmBitsPixel; KxIyc7.  
 bih.biClrImportant=0; _'!kuE,*1  
 bih.biClrUsed=0; m|O1QM;T  
 bih.biCompression=0; zXZir7NfM  
 bih.biHeight=btm.bmHeight; Qs9OC9X1  
 bih.biPlanes=1; FJ54S  
 bih.biSize=sizeof(BITMAPINFOHEADER); O)]v;9oER  
 bih.biSizeImage=size; wvN`R  
 bih.biWidth=btm.bmWidth; G-u]L7t&1  
 bih.biXPelsPerMeter=0; NmpnJu|8  
 bih.biYPelsPerMeter=0; $ 4m*kQ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7 ^$;  
 static int filecount=0; =-#G8L%Q  
 CString name; <jA105U"m>  
 name.Format("pict%04d.bmp",filecount++); s^hR\iY  
 name=m_Path+name; G$bJ+  
 BITMAPFILEHEADER bfh; e,gyQjJR  
 bfh.bfReserved1=bfh.bfReserved2=0; !L$x:/R9M  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -SCM:j%h  
 bfh.bfSize=54+size; 28I^$> [  
 bfh.bfOffBits=54; @Jn!0Y1_3  
 CFile bf; FwG!>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t;NV $!!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); O.QK"pKD\  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O_~7Glu  
  bf.WriteHuge(lpData,size); 7DD&~ZcD  
  bf.Close(); 4aUiXyr*2  
  nCount++; =9wy/c$  
 } `yiC=$*[  
 GlobalFreePtr(lpData); R2<s0l  
 if(nCount==1) 4hs)b  
  m_Number.Format("%d picture captured.",nCount); G`0V)S  
 else <vV_%uo M  
  m_Number.Format("%d pictures captured.",nCount); v,@F|c?_S  
  UpdateData(FALSE); }G V X>p  
} ==N{1gO]  
hz:pbes  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) u=x+ J=AH  
{ O`[aU%4b  
 if(pMsg -> message == WM_KEYDOWN) iUi>y.}"P  
 { hX:"QXx  
  if(pMsg -> wParam == VK_ESCAPE) zeb=8 Dg :  
   return TRUE; h^UKT`9vt  
  if(pMsg -> wParam == VK_RETURN) aB~S?.l  
   return TRUE; Z<?OwAWz  
 } X{xBYZv4  
 return CDialog::PreTranslateMessage(pMsg); 2,q}N q  
} PNs~[  
=q7Z qP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ').}Nz  
{ ia@'%8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ : rMM4  
  SaveBmp(); w8S!%abl1  
  return FALSE; !9Z r;K~\  
} dP?Ge}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ YyAJ m^o  
 CMenu pop; -VKS~{  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); w'MGA  
 CMenu*pMenu=pop.GetSubMenu(0); RGKYW>$0RR  
 pMenu->SetDefaultItem(ID_EXITICON); `.jzuX  
 CPoint pt; YHkcWz  
 GetCursorPos(&pt); % 2$/JZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); b V+(b9  
 if(id==ID_EXITICON) Q_-_^J  
  DeleteIcon(); X|f7K  
 else if(id==ID_EXIT) g- AHdYJ  
  OnCancel(); J]l rS  
 return FALSE; gxz-R?.  
} fZ04!R  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Qd}m`YW-f$  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xsd_Uu*  
 AddIcon(); L37Y+C//  
 return res; wN1niR'  
} <h%O?mkC  
g VQjL+_W  
void CCaptureDlg::AddIcon() ;c~cet4  
{ @SZM82qU2z  
 NOTIFYICONDATA data; FuI73  
 data.cbSize=sizeof(NOTIFYICONDATA); 3bk|<7tl  
 CString tip; NH$r Z7$  
 tip.LoadString(IDS_ICONTIP); *.L81er5~  
 data.hIcon=GetIcon(0); #e' }.4cr  
 data.hWnd=GetSafeHwnd(); &j(+/;A  
 strcpy(data.szTip,tip); G9g1hie@%  
 data.uCallbackMessage=IDM_SHELL; i1H\#;`$  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; bM8If"  
 data.uID=98; 'RRmIx2X  
 Shell_NotifyIcon(NIM_ADD,&data); }ci#>  
 ShowWindow(SW_HIDE); )* 4fzo  
 bTray=TRUE; }*.0N;;C  
} pw7[y^[Qg  
>:D j\"o  
void CCaptureDlg::DeleteIcon() =t6z \WB  
{ =FE|+!>PA  
 NOTIFYICONDATA data; :ba5iMa  
 data.cbSize=sizeof(NOTIFYICONDATA); UnI 48Y  
 data.hWnd=GetSafeHwnd(); aLIBD'z  
 data.uID=98; (`y*V;o4  
 Shell_NotifyIcon(NIM_DELETE,&data); =Umw$+fJr  
 ShowWindow(SW_SHOW); EEGy!bff  
 SetForegroundWindow(); 5:'hj$~|\1  
 ShowWindow(SW_SHOWNORMAL); V(Ub!n:j  
 bTray=FALSE; `rf_7  
} xg)v0y~  
`jwa<N4e@  
void CCaptureDlg::OnChange() f=)2f =  
{ MEwo}=B  
 RegisterHotkey(); /yM:| `tT  
} }Ho Qwy|&  
`uC@nJ  
BOOL CCaptureDlg::RegisterHotkey() ]Dw]p! @  
{ 0v9rv.Y"  
 UpdateData(); #dM9pc jh  
 UCHAR mask=0; NH+(?TN  
 UCHAR key=0; ~%YBI9$+  
 if(m_bControl) &^W|iXi#  
  mask|=4; Fd0 %lnui  
 if(m_bAlt) M bb x`  
  mask|=2; qK)73eNSR  
 if(m_bShift) % LJs  
  mask|=1; Th=eNL]  
  key=Key_Table[m_Key.GetCurSel()]; r#XT3qp$d  
 if(bRegistered){ g]*#%Xa  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }Hn/I,/  
  bRegistered=FALSE; St e=&^  
 } ^<e.]F25M  
 cMask=mask; y-1 pR  
 cKey=key; *8LMn   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); '0FhL)x?"T  
 return bRegistered; 8 XU1 /i7N  
} )kP5u`v  
y3h/ IpT  
  四、小结 KQ~i<1&j  
,v{rCxFtvU  
  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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