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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: &=Zg0Q  
  5|CiwQg|,p  
  一、实现方法 (nD$%/uK'  
yXA f  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: BozK!"R_<  
X-1Vp_(,TP  
#pragma data_seg("shareddata") Z9&D'n)  
HHOOK hHook =NULL; //钩子句柄 8-a6Q|   
UINT nHookCount =0; //挂接的程序数目 Zd U{`>v  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 1Wk EPj,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Mlw9#H6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey mRH]'d lD7  
static int KeyCount =0; 0l: pWc  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 huJq#5?  
#pragma data_seg() g&3#22z  
dB+GTq=6f  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 \TB%N1^  
wDSUMB<?  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: {[5L96RH%  
L4pjh&+8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR G>,nZ/,A{  
cKey,UCHAR cMask) 8I\eromG  
{ P5}[*k%DQw  
 BOOL bAdded=FALSE; P%`R7yk  
 for(int index=0;index<MAX_KEY;index++){ @zynqh  
  if(hCallWnd[index]==0){ zQ5jx5B":  
   hCallWnd[index]=hWnd; O)xEF~DaD  
   HotKey[index]=cKey; /QXs-T}d  
   HotKeyMask[index]=cMask; ; G59}d p~  
   bAdded=TRUE; 4@]xn  
   KeyCount++; StZRc\k  
   break; nqxq@.L2  
  } N9=r#![>,  
 } 2Z`$  
 return bAdded; H'0*CiHes  
} K-EI?6`xM  
//删除热键 ^s@*ISY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ju^"vw  
{ nG ^M 2)(8  
 BOOL bRemoved=FALSE; (Cl`+ V  
 for(int index=0;index<MAX_KEY;index++){ 5'kTe=  
  if(hCallWnd[index]==hWnd){ V1`5D7Z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ c_G-R+  
    hCallWnd[index]=NULL; HcBH!0  
    HotKey[index]=0; j,56Lh%1  
    HotKeyMask[index]=0; Vr-3M+l=O  
    bRemoved=TRUE; L`\`NNQC  
    KeyCount--; *mQDS.'AB@  
    break; RC8)f8n  
   } ^KZAYB9C  
  } *)NR$9lGv  
 } B)DC,+@$  
 return bRemoved; Jl> at  
} D){"fw+b  
2[LX\  
gl9pgY1ni  
  DLL中的钩子函数如下: {FJX  
M8?#%x6;N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) urrO1  
{ u_4:#~b  
 BOOL bProcessed=FALSE; ?b@q5Y  
 if(HC_ACTION==nCode) *H%0Gsk  
 { 6>=-/)p}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $ o5V$N D  
   switch(wParam) T^'*_*m  
   {  I[g?Ju >  
    case VK_MENU: AY&9JSu 6  
     MaskBits&=~ALTBIT; =MJ-s;raq  
     break; T+K` ^xv_L  
    case VK_CONTROL: %;<k(5bhGJ  
     MaskBits&=~CTRLBIT; J\xz^%p  
     break; ycrh5*g  
    case VK_SHIFT: )'j_D<  
     MaskBits&=~SHIFTBIT; )l!J$X+R  
     break; h{W$ fZc<  
    default: //judge the key and send message Y|m_qB^_  
     break; qD(fYOX{C  
   } bIb6yVnHi  
   for(int index=0;index<MAX_KEY;index++){ u+mjguIv  
    if(hCallWnd[index]==NULL) Q$?7)yyu+  
     continue; 7cUR.PI#Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %UUp=I  
    { Ok}{jwJ%W;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^I(oy.6?=p  
     bProcessed=TRUE; ]^*_F  
    } *`+<x  
   } ;!l*7}5X=  
  } #gX%X~w$F  
  else if((lParam&0xc000ffff)==1){ //有键按下 vz;7} Zj]  
   switch(wParam) A*\o c  
   { tA! M  
    case VK_MENU: 79{.O`v  
     MaskBits|=ALTBIT; MPKpS3VS  
     break; 0a2$P+p  
    case VK_CONTROL: < v|%K.yd  
     MaskBits|=CTRLBIT; $@[dm)M  
     break; J ?ztn  
    case VK_SHIFT: }t@f |TX  
     MaskBits|=SHIFTBIT; m4P hn~>Gg  
     break;  3}>:  
    default: //judge the key and send message L _vblUDq  
     break; Q^a&qYK  
   } pBSq%Hy:  
   for(int index=0;index<MAX_KEY;index++){ BKE\SWu  
    if(hCallWnd[index]==NULL) ~rgf{oGz  
     continue; WZ^{zFoZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y|%anTP  
    { $i,6B9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DO7- =74=  
     bProcessed=TRUE; /*u#Ba<<  
    } J6)efX)j-p  
   } C6K|:IK{  
  } b4Ricm  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6 WA|'|}=  
   for(int index=0;index<MAX_KEY;index++){ 1.Haf  
    if(hCallWnd[index]==NULL) t{/:(Nu  
     continue; p!HPp Ef+#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "XGD:>Q.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vnz[w=U  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 TpJg-F  
   } Zg)_cRR   
  } )ZT6:)  
 } 5z1\#" B[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~A8qeaP  
} D ?Nd; [  
- *:p.(c  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 5~@?>)TBv  
%/UV_@x&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  EX[B/YH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4=u+ozCG  
N@k3$+ls  
  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: d>lt  
+<S9E'gT3V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Wc~3^ ;U  
{ &?SX4c~?u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) J+{Ou rWt  
 { 8K|J:[7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lbQ6 a  
  SaveBmp(); AI&qU/}  
  return FALSE; 1i4WWK7k  
 } yJDeX1+,  
 …… //其它处理及默认处理 /3Jz3  
} f=t:[ < )  
7)B&(2D&  
x1t{SQ-C  
  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。 !cRfZ  
{/-y>sm  
  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。 j_!bT!8  
}TSgAwsbC  
  二、编程步骤 MVeF e\r  
F(d:t!  
  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"; PXV)NC  
ETM2p1 ru0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; K@q&HV"'.  
qOW#Q:T  
  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; t:\l&R&  
~V @;(_T  
  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; X6Un;UL  
p`d XqW  
  5、 添加代码,编译运行程序。 2Oyy`k  
p={Jf}v  
三、程序代码 `-4'/~G  
[-4KY4R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL :%N*{uy  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ITVQLQ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ q<n[.u1@  
#if _MSC_VER > 1000 ;xfO16fNk  
#pragma once haCKv   
#endif // _MSC_VER > 1000 92ZWU2"  
#ifndef __AFXWIN_H__ Ffnk1/ Zy  
#error include 'stdafx.h' before including this file for PCH Y!Drb-U?;  
#endif o*X]b]  
#include "resource.h" // main symbols $50\" mo~z  
class CHookApp : public CWinApp cC' ~  
{ S"zk!2@C  
 public: x5oOF7#5  
  CHookApp(); E(_ KN[}S  
  // Overrides K]X` sH:  
  // ClassWizard generated virtual function overrides yk<VlS  
  //{{AFX_VIRTUAL(CHookApp) ^ pj>9%  
 public: qB:AkMd&  
  virtual BOOL InitInstance(); tmp6hB  
  virtual int ExitInstance(); b6|Z"{TI _  
  //}}AFX_VIRTUAL ~F;CE"3A  
  //{{AFX_MSG(CHookApp) (z/jMMms  
  // NOTE - the ClassWizard will add and remove member functions here. j?xk&  
  // DO NOT EDIT what you see in these blocks of generated code ! D z@1rc<B  
  //}}AFX_MSG \SOeTn+  
  DECLARE_MESSAGE_MAP() S`=n&'  
}; $ADPV,*gG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "qawq0P8Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7Re-5vz R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); BBxc*alG0  
BOOL InitHotkey(); #EJP(wXa  
BOOL UnInit(); JT04vm4  
#endif 3E,DipHg  
dByjcTPA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. \QGa 4_#  
#include "stdafx.h" wFvT0  
#include "hook.h" Cc!J1)  
#include <windowsx.h> s O=4IBE  
#ifdef _DEBUG |H W( vA  
#define new DEBUG_NEW 4@6 <  
#undef THIS_FILE W .U+.hR  
static char THIS_FILE[] = __FILE__; T^]7R4 Fg  
#endif /YFa ;2 W  
#define MAX_KEY 100 Q/py qe G  
#define CTRLBIT 0x04  it)ZP H  
#define ALTBIT 0x02 \]8VwsP  
#define SHIFTBIT 0x01 } ~F~hf>s  
#pragma data_seg("shareddata") ^LVk5l)\>g  
HHOOK hHook =NULL; Umz05*  
UINT nHookCount =0; ]boE{R!I  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey L6+C]t}>6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 9/@ &*  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey paWxanSt  
static int KeyCount =0; TGf;_)El  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X FQNr`  
#pragma data_seg() +Rqbf  
HINSTANCE hins; |c0,  
void VerifyWindow(); 4z_n4=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @r<b:?u  
//{{AFX_MSG_MAP(CHookApp) =WK04\H  
// NOTE - the ClassWizard will add and remove mapping macros here. e[{mVhg4E  
// DO NOT EDIT what you see in these blocks of generated code! 'w.}2(  
//}}AFX_MSG_MAP ,hWcytzEw  
END_MESSAGE_MAP() =IZ[_ /@  
RBE7485  
CHookApp::CHookApp() cKjRF6w  
{ &s8<6P7  
 // TODO: add construction code here, #by Jqy&e  
 // Place all significant initialization in InitInstance J4>;[\%m  
} K(VW%hV1  
d2~l4IL)~  
CHookApp theApp; _R^y\1Qu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ARF\fF|<2  
{ 1k[GuG%/K  
 BOOL bProcessed=FALSE; 'wvMH;}u  
 if(HC_ACTION==nCode) ;7Okyj6EP  
 { SE)nD@:  
  if((lParam&0xc0000000)==0xc0000000){// Key up 514Z<omrK  
   switch(wParam) mb1Vu  
   { % 5z gd>  
    case VK_MENU: DnFjEP^  
     MaskBits&=~ALTBIT; XA{F:%  
     break; m5*[t7@%  
    case VK_CONTROL: :Fe_,[FR  
     MaskBits&=~CTRLBIT; =K(JqSw+M  
     break; fx)KNm8Lx  
    case VK_SHIFT: -bS)=L  
     MaskBits&=~SHIFTBIT; &RO7{,`  
     break; '#D8*OP^  
    default: //judge the key and send message Svw<XJ   
     break; ((<`zx  
   } ()\jCNLT  
   for(int index=0;index<MAX_KEY;index++){ 9I .^LZ"  
    if(hCallWnd[index]==NULL) yMxTfR  
     continue; B!;+_%P76  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -V5w]F'  
    { 68e[:wf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); [T^?Q%h  
     bProcessed=TRUE; F*` t"7Lm  
    } &| !B!eOY  
   } iZxt/}1X0  
  } exZLj0kvF  
  else if((lParam&0xc000ffff)==1){ //Key down LZ<[ll#C  
   switch(wParam) ~3CVxbB^<  
   { IQnIaZ  
    case VK_MENU: ,T|x)"uA`  
     MaskBits|=ALTBIT; U~H?4Izl=  
     break; cWa)#:JOV  
    case VK_CONTROL: U>F{?PReA?  
     MaskBits|=CTRLBIT; kOjf #@c  
     break; |V|+lx'sc  
    case VK_SHIFT: %3o`j<  
     MaskBits|=SHIFTBIT; =&vFVIhWcf  
     break; q \O Ou  
    default: //judge the key and send message !SxG(*u  
     break; & mt)d  
   } vt1lR5  
   for(int index=0;index<MAX_KEY;index++) !{Z~<Ky  
   { LFf`K)q  
    if(hCallWnd[index]==NULL) QyGnDomQ  
     continue; ;Vu5p#,O<M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RMP9y$~3pU  
    { P^)q=A8Z#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); jc:s` 4  
     bProcessed=TRUE; \/5RL@X}  
    } |+}G|hx@9  
   } lzhqcL"  
  } vmX"+sHz$]  
  if(!bProcessed){ L0NA*C   
   for(int index=0;index<MAX_KEY;index++){ fU+Pn@'  
    if(hCallWnd[index]==NULL) ,6,]#R :J  
     continue; m3.sVI0I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q(Gl{#b  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nwmW.(R4  
   } GF$`BGW  
  } x#H 3=YD*  
 } ;\{`Ci\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); X+82[Y,mB.  
} :iUF7P1I  
k'3Wt*i  
BOOL InitHotkey() 6.c^u5;  
{ (gXN%rsY  
 if(hHook!=NULL){ Vba.uKNjk  
  nHookCount++; (zcLx;N  
  return TRUE; M(Zc^P}N  
 } $}o b,i^W  
 else  QLKK.]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); HM9fjl[  
  if(hHook!=NULL) ej(ikj~j  
   nHookCount++; <AoXEu D  
  return (hHook!=NULL); @n+=vC.xO  
} ?cy4&]s  
BOOL UnInit() @It>*B yB.  
{ #,NvO!j<4  
 if(nHookCount>1){ #& ?g %'  
  nHookCount--; mUoIJ3fv_,  
  return TRUE; 5:.{oSy7n  
 } =O$M_1lp  
 BOOL unhooked = UnhookWindowsHookEx(hHook); kG0Yh2;#  
 if(unhooked==TRUE){ c&nh>oN  
  nHookCount=0; d+fSo SjX8  
  hHook=NULL; PnYBy| yl  
 } H17-/|-;0!  
 return unhooked; t18$x "\4k  
} `3_lI~=eH  
CH#k(sy  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f 2YLk  
{ ;2xO`[#  
 BOOL bAdded=FALSE; c1XX~8  
 for(int index=0;index<MAX_KEY;index++){ f!_ ctp  
  if(hCallWnd[index]==0){ SU.ythU2,c  
   hCallWnd[index]=hWnd; MXtkP1A `  
   HotKey[index]=cKey; 3'`dFY,  
   HotKeyMask[index]=cMask; } ^kL|qmjR  
   bAdded=TRUE; ??&<k   
   KeyCount++; rNDrp@A>  
   break; w3T]H_V  
  } p{$p $/A  
 } F>hZ{   
 return bAdded; 0Q5^C!K  
} !ZXUPH  
pv)`%<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #I*QX%(H#  
{ ` uCIXb  
 BOOL bRemoved=FALSE; {FO$yw=>  
 for(int index=0;index<MAX_KEY;index++){ dt\jGD  
  if(hCallWnd[index]==hWnd){ G4 _,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ R:aa+MX(1  
    hCallWnd[index]=NULL; V^s0fWa  
    HotKey[index]=0; gb|Q%LS9R  
    HotKeyMask[index]=0; =n(3o$r(  
    bRemoved=TRUE; TI|/u$SJ<Z  
    KeyCount--; PJ4(}a  
    break; @~td`Z?1 y  
   } *Mc7f?H  
  } w8Sv*K  
 } \*t~==WB  
 return bRemoved; Ol_q{^  
} `{v?6:G:Q  
NQHz<3S[  
void VerifyWindow() 8jlLUG:g  
{ yY).mxRN  
 for(int i=0;i<MAX_KEY;i++){ ;E^K.6  
  if(hCallWnd!=NULL){ )FN;+"IJ  
   if(!IsWindow(hCallWnd)){ KJn!Ap  
    hCallWnd=NULL; 08bJCH  
    HotKey=0; R"v 3!P  
    HotKeyMask=0; nk"NmIf  
    KeyCount--; (rtY!<|p  
   } |OO in]5  
  } WiL2  
 } lCd@jB{  
} ] y{WD=T  
OPJ: XbG  
BOOL CHookApp::InitInstance() Y$K!7Kq  
{ Cizvw'XDV  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); igL<g  
 hins=AfxGetInstanceHandle(); E>LkJSy=  
 InitHotkey(); 5Z/7kU= I  
 return CWinApp::InitInstance(); 0 fXLcal  
} ,8'>R@o  
@D^^_1~  
int CHookApp::ExitInstance() u^Ku;RQo  
{ Uh eC  
 VerifyWindow(); oTjyN\?H  
 UnInit(); 2NGe C0=  
 return CWinApp::ExitInstance(); p/Sbt/R  
} z+}QZ >  
~+X9g  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file B<?[Mrdxw  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) e!-,PU9+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .R*!aK  
#if _MSC_VER > 1000 "^j>tii  
#pragma once {]*x*aa\  
#endif // _MSC_VER > 1000 g6t"mkMY L  
/&#XhrT  
class CCaptureDlg : public CDialog RprKm'b8x`  
{ 2zSG&",2D  
 // Construction o Pci66  
 public: h5_G4J{1  
  BOOL bTray; *.-.iY.a]  
  BOOL bRegistered; N{SQ( %V  
  BOOL RegisterHotkey(); <:>SGSE9  
  UCHAR cKey; _ZB\L^j)  
  UCHAR cMask; Y}*\[}l:&x  
  void DeleteIcon(); 'n QVj  
  void AddIcon(); 7tM9u5FF  
  UINT nCount; )4U> !KrY  
  void SaveBmp(); w.\w1:d  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [S]S^ej*8  
  // Dialog Data tY${M^^<J  
  //{{AFX_DATA(CCaptureDlg) 8(g:HR*;  
  enum { IDD = IDD_CAPTURE_DIALOG }; b+-f.!j  
  CComboBox m_Key; XKA&XpF  
  BOOL m_bControl; 5vAf7\*  
  BOOL m_bAlt; @oF$LMD  
  BOOL m_bShift; ]r! >{  
  CString m_Path; i@5[FC  
  CString m_Number; HW4 .zw  
  //}}AFX_DATA >Iewx Gb>  
  // ClassWizard generated virtual function overrides ,Y?sfp  
  //{{AFX_VIRTUAL(CCaptureDlg) % }|cb7l  
 public: yH 9!GS#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); XIo55*  
 protected: enNiI$H]`_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 93qwH%  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); `!:q;i]}  
  //}}AFX_VIRTUAL 1% F?B-k  
  // Implementation <$w?/y/'  
 protected: u cwnA  
  HICON m_hIcon; 5 8-e^.  
  // Generated message map functions f %lD08Sl  
  //{{AFX_MSG(CCaptureDlg) Sd/?&  
  virtual BOOL OnInitDialog(); EpS(o>'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); jc[_I&Oc_  
  afx_msg void OnPaint(); 8[CB>-9  
  afx_msg HCURSOR OnQueryDragIcon();  |{* }|  
  virtual void OnCancel(); xqXDxJlns  
  afx_msg void OnAbout(); t>GfM  
  afx_msg void OnBrowse(); (bOpV>\Q7  
  afx_msg void OnChange(); Tu{&v'!j6  
 //}}AFX_MSG :WI.LKlo~  
 DECLARE_MESSAGE_MAP() pMg3fUIM  
}; `~eX55W  
#endif zl-2$}<a  
M/?KV9Xk2  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +uWDP .  
#include "stdafx.h" "'8KV\/D  
#include "Capture.h" .@-9'<K?~  
#include "CaptureDlg.h" ML-)I&>tT  
#include <windowsx.h> |4mpohX  
#pragma comment(lib,"hook.lib") Cz4)Yz  
#ifdef _DEBUG `b8v1Os^2  
#define new DEBUG_NEW +')f6P;t>=  
#undef THIS_FILE , P'P^0qJ  
static char THIS_FILE[] = __FILE__; >&g}7d%  
#endif '}g*!jL  
#define IDM_SHELL WM_USER+1 +X`V|E,no  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I)q,kP@yY  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); {U 'd}Q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4Wy <?O2  
class CAboutDlg : public CDialog A7! g  
{ 72sD0)?A  
 public: 6C>_a*w  
  CAboutDlg(); =.]l*6W V  
  // Dialog Data [S.ZJUns  
  //{{AFX_DATA(CAboutDlg) RT93Mt%P  
  enum { IDD = IDD_ABOUTBOX }; {7cX#1  
  //}}AFX_DATA tx"sH]n  
  // ClassWizard generated virtual function overrides n .!Ym X4  
  //{{AFX_VIRTUAL(CAboutDlg) a$"ib  
 protected: +,:du*C  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <9=9b_z  
  //}}AFX_VIRTUAL {X2`&<i6  
  // Implementation *5zrZ]^  
 protected: xD&^j$Em  
  //{{AFX_MSG(CAboutDlg) h2ZkCML  
  //}}AFX_MSG fgNU03jp^x  
  DECLARE_MESSAGE_MAP() SVjl~U-^  
}; 7NC=*A~  
7'wS\/e4a  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) JKer//ng4  
{ 2L AYDaS  
 //{{AFX_DATA_INIT(CAboutDlg) ZcuA6#3B  
 //}}AFX_DATA_INIT TF2>4 p  
} v7%X@j]ji  
&t5{J53  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6"c1;P!4   
{ v+jsC`m  
 CDialog::DoDataExchange(pDX); >7!6nF3x,  
 //{{AFX_DATA_MAP(CAboutDlg) }SIGPVM  
 //}}AFX_DATA_MAP *. 3N=EO  
} |F.)zC5{  
=%zLh<3v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {bO|409>W  
 //{{AFX_MSG_MAP(CAboutDlg) [1Ydo`  
 // No message handlers e4~>G?rM_  
 //}}AFX_MSG_MAP F}"]92  
END_MESSAGE_MAP() y9#$O(G  
iHf-{[[Z  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) +0),xu  
: CDialog(CCaptureDlg::IDD, pParent) R3k1RE2c&g  
{ SI:U0gUc  
 //{{AFX_DATA_INIT(CCaptureDlg) b3wM;jv  
  m_bControl = FALSE; nhG J  
  m_bAlt = FALSE; 7Cjd.0T=(  
  m_bShift = FALSE; bCZ g cN  
  m_Path = _T("c:\\"); .1 %T W)  
  m_Number = _T("0 picture captured."); kE TT4U  
  nCount=0; Le"oAA#[  
  bRegistered=FALSE; $+}+zZX5  
  bTray=FALSE; 86f2'o+  
 //}}AFX_DATA_INIT Tz2-Bp]h  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 DO7W}WU  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); s4_/&h  
} 9 2MTX Osp  
?Qb<-~~ j1  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <8UYhGK  
{ CE15pNss  
 CDialog::DoDataExchange(pDX); IlX$YOf4  
 //{{AFX_DATA_MAP(CCaptureDlg) uP\lCqK,  
  DDX_Control(pDX, IDC_KEY, m_Key); RtG}h[k/X  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ~x{.jn  
  DDX_Check(pDX, IDC_ALT, m_bAlt); V|)>{Xdn  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :b[`  v  
  DDX_Text(pDX, IDC_PATH, m_Path); 8@NH%zWBp  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =66Nw(E.  
 //}}AFX_DATA_MAP ;Ut+yuy  
} .oEmU+  
jkiTj~WE-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) zo;^m|  
//{{AFX_MSG_MAP(CCaptureDlg) C0=9K@FCb  
 ON_WM_SYSCOMMAND() H"2uxhdLK3  
 ON_WM_PAINT() F_xbwa*=  
 ON_WM_QUERYDRAGICON() #S%Q*k<hw  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 7?OH,^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `RMI(zI3g.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) DoC(Z)o  
//}}AFX_MSG_MAP >pkT1Z&'  
END_MESSAGE_MAP() _md=Q$9!m  
UN"(5a8.  
BOOL CCaptureDlg::OnInitDialog() s<x1>Q7X~  
{ -st7_3  
 CDialog::OnInitDialog(); _ >` X]I;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); @v\*AYr'M  
 ASSERT(IDM_ABOUTBOX < 0xF000); q.Nweu!jQ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (]/9-\6(#  
 if (pSysMenu != NULL) bbxLBD'  
 { .I3?7  
  CString strAboutMenu; bYe;b><G  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Oo?,fw  
  if (!strAboutMenu.IsEmpty()) 4E44Hzs  
  { R];Ox e  
   pSysMenu->AppendMenu(MF_SEPARATOR); elG;jB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); UEak^Mm;=2  
  } 4Ij-Ilg)%  
 } i?Ss:v^  
 SetIcon(m_hIcon, TRUE); // Set big icon ,wwZI`>-  
 SetIcon(m_hIcon, FALSE); // Set small icon > Oh?%%6  
 m_Key.SetCurSel(0); P)dL?vkK  
 RegisterHotkey(); M Jj4Hd  
 CMenu* pMenu=GetSystemMenu(FALSE); {F&-7u0  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >-E<n8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wV?,Z!\Z  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \qsw"B*tv`  
 return TRUE; // return TRUE unless you set the focus to a control 9>/wUQs!]  
} =TR,~8Z|  
F#xa`*AP  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =Cqv=   
{ /8@m<CW2Y  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) dQy>Nmfy  
 { =1dI>M>tm  
  CAboutDlg dlgAbout; ^EVc95|Z  
  dlgAbout.DoModal(); I PE}gp  
 } ryO$6L  
 else y0v]N  
 { 8GJdRL(  
  CDialog::OnSysCommand(nID, lParam); #s5 pz8v  
 } cIXwiC8t  
} ,1Qd\8N9  
 &O[s:  
void CCaptureDlg::OnPaint() &R+#W  
{ O`FqD{@V  
 if (IsIconic()) x}fn 'iUnm  
 { jW*1E *"  
  CPaintDC dc(this); // device context for painting n)8Yj/5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); T+"f]v  
  // Center icon in client rectangle zIQzmvf  
  int cxIcon = GetSystemMetrics(SM_CXICON); yI:# |w|  
  int cyIcon = GetSystemMetrics(SM_CYICON);  ]^"k8v/  
  CRect rect; ~#M d"3  
  GetClientRect(&rect); =4C}{IL  
  int x = (rect.Width() - cxIcon + 1) / 2; 5/ecaAB2  
  int y = (rect.Height() - cyIcon + 1) / 2; (J:dK=O@Z  
  // Draw the icon jRkC/Lw  
  dc.DrawIcon(x, y, m_hIcon); @b!"joEy  
 } B_3QQ tjAl  
 else |oKu=/[K  
 { E|Bd>G  
  CDialog::OnPaint(); U+]Jw\\l  
 } <FFJzNc+  
} lH BI  
<MD;@_Nz\  
HCURSOR CCaptureDlg::OnQueryDragIcon() )&NAs  
{ wN]J8Ir  
 return (HCURSOR) m_hIcon; ;M v~yb3v  
} {'3D1#SK  
,-*iCs<  
void CCaptureDlg::OnCancel() >POO-8Q  
{ f~& a-  
 if(bTray) u'9gVU B  
  DeleteIcon(); V: p)m&y6  
  CDialog::OnCancel(); gqiXmMm:9  
} _pDjg%A>n  
=(U/CI  
void CCaptureDlg::OnAbout() K\=8eg93Z  
{ H9"=  p  
 CAboutDlg dlg; QrjDF>   
 dlg.DoModal(); i3V/`)iz  
} o 5Zyh26  
[$:,-Q@  
void CCaptureDlg::OnBrowse() "h$R ]~eG  
{ '% 4P;HO  
 CString str; vgPUIxB@  
 BROWSEINFO bi; D(Ix!G/  
 char name[MAX_PATH]; !c8L[/L  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); B#N7qoi  
 bi.hwndOwner=GetSafeHwnd();  .Oo/y0E^  
 bi.pszDisplayName=name; i*tv,f.(  
 bi.lpszTitle="Select folder"; ~@c-*  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 2RNrIU I2  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); hYt7kq!"  
 if(idl==NULL) nsJ:Osq|  
  return; ;x[pM_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); n E :'Zxj  
 str.ReleaseBuffer(); ^" 6f\  
 m_Path=str; }5S2p@W)  
 if(str.GetAt(str.GetLength()-1)!='\\') 8GB]95JWwp  
  m_Path+="\\"; rZC3\,W  
 UpdateData(FALSE); uCUu!Vfeg  
} =y;@?=T  
CyTFb$Z  
void CCaptureDlg::SaveBmp() Z] {@H  
{ o<\6Rm  
 CDC dc; Z;*`f d?8  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); # cWHDRLX  
 CBitmap bm; _"f<Ol[!  
 int Width=GetSystemMetrics(SM_CXSCREEN); m#ad6 \  
 int Height=GetSystemMetrics(SM_CYSCREEN); Y?!/>q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); *,jqE9:O  
 CDC tdc; O)<r>vqe}  
 tdc.CreateCompatibleDC(&dc); ) hdgz$cl  
 CBitmap*pOld=tdc.SelectObject(&bm); gE=Wcb!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &wGg6$  
 tdc.SelectObject(pOld); j;0ih_Z@4W  
 BITMAP btm; kgc.8  
 bm.GetBitmap(&btm); W:B}u\)C  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; cju@W]!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;GQm[W([  
 BITMAPINFOHEADER bih; #_p  
 bih.biBitCount=btm.bmBitsPixel; }9}w8R~E  
 bih.biClrImportant=0; bw;iz ,Z  
 bih.biClrUsed=0; G-8n  
 bih.biCompression=0; Jk~UEqr+  
 bih.biHeight=btm.bmHeight; T g\hx>  
 bih.biPlanes=1; (\uA AW"  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7 s-`QdWX  
 bih.biSizeImage=size; pP oxVvG{  
 bih.biWidth=btm.bmWidth; Sgx+V"bkT  
 bih.biXPelsPerMeter=0; }!knU3J  
 bih.biYPelsPerMeter=0; ;>/ipnx  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <[FS%2,0mb  
 static int filecount=0; hgif]?:C<  
 CString name; 69OET_AS>  
 name.Format("pict%04d.bmp",filecount++); @2|G|C/]O}  
 name=m_Path+name; (V^QQ !:  
 BITMAPFILEHEADER bfh;  3:"AFV  
 bfh.bfReserved1=bfh.bfReserved2=0; %IPyCEJD  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -MUQ \pZ  
 bfh.bfSize=54+size; B*BHF95!  
 bfh.bfOffBits=54; 'iGMn_&  
 CFile bf; W=M< c@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 8|Q4-VK<!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i!y\WaCp  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =Y:5,.U  
  bf.WriteHuge(lpData,size); w[M5M2CF  
  bf.Close(); Hq79/ wKj  
  nCount++; QZ:v  
 } p0?o<AA%O  
 GlobalFreePtr(lpData); >Ziy1Dp  
 if(nCount==1) 6J]~A0vsi}  
  m_Number.Format("%d picture captured.",nCount); V9gVn?O0  
 else @eA %(C  
  m_Number.Format("%d pictures captured.",nCount); mn Qal>0~  
  UpdateData(FALSE); vB]3Xb3a  
} 8[f8k 3g  
@ > cdHv  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H2s*s[T -  
{ $kM '  
 if(pMsg -> message == WM_KEYDOWN) s%hU*^ 8  
 { &~42T}GTWG  
  if(pMsg -> wParam == VK_ESCAPE) =CGD ~p`  
   return TRUE; +0SW ?#%  
  if(pMsg -> wParam == VK_RETURN) -.^=Z!=M  
   return TRUE; fWqv3nY^  
 } 8x` Kl(  
 return CDialog::PreTranslateMessage(pMsg); ]9dx3<2_I  
} <[esA9.]t  
6MrZ6dz^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) / O|Td'Z  
{ N,h1$)\B#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \IO$ +Guh  
  SaveBmp(); ]L[JS^#7  
  return FALSE; dw'<"+zO  
} @Pd) %'s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 8  /5sv  
 CMenu pop; H^]Nmd8Q)  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); hg$qb eUl  
 CMenu*pMenu=pop.GetSubMenu(0); +R3\cRM  
 pMenu->SetDefaultItem(ID_EXITICON); <W=~UUsn  
 CPoint pt; `%KpTh  
 GetCursorPos(&pt); nNd`]F^U  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /8 e2dw: \  
 if(id==ID_EXITICON) Aqx3!  
  DeleteIcon();  Dlqn~  
 else if(id==ID_EXIT) Z[DetRc-  
  OnCancel(); $]Q*E4(kV9  
 return FALSE; JUe K"|fA  
} 5bu[}mJ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); i}v}K'`  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) *u:;:W&5y  
 AddIcon(); 1(#*'xR  
 return res; CVyx lc>  
} f}Ne8]U/Hc  
/Bg6z m  
void CCaptureDlg::AddIcon() ,yB?~  
{ 4?P%M"\Iv  
 NOTIFYICONDATA data; i?1js! 8  
 data.cbSize=sizeof(NOTIFYICONDATA); M~d+HE   
 CString tip; ! 0>!tW  
 tip.LoadString(IDS_ICONTIP); '$2oSd  
 data.hIcon=GetIcon(0); IS5.i95m  
 data.hWnd=GetSafeHwnd(); twYB=68  
 strcpy(data.szTip,tip); *_2O*{V  
 data.uCallbackMessage=IDM_SHELL; i/C -{+}U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; X\c1q4oB[  
 data.uID=98; >q} !>k$B  
 Shell_NotifyIcon(NIM_ADD,&data); FOlA* U4U  
 ShowWindow(SW_HIDE); =,/A\F  
 bTray=TRUE; qb>|n1F_  
} n6}E4Eno  
P!)7\.7  
void CCaptureDlg::DeleteIcon() zezofW]a  
{ % +t  
 NOTIFYICONDATA data; o1p$9PL\:  
 data.cbSize=sizeof(NOTIFYICONDATA); a6 #{2q  
 data.hWnd=GetSafeHwnd(); )$9C`d[  
 data.uID=98; =hOj8;2  
 Shell_NotifyIcon(NIM_DELETE,&data); N>cp>&jV  
 ShowWindow(SW_SHOW); HiS,q0  
 SetForegroundWindow(); ,\m;DR1  
 ShowWindow(SW_SHOWNORMAL); [+:mt</HN  
 bTray=FALSE; 3;t@KuQ66  
} Q)%8NVs  
#LrCx"_&  
void CCaptureDlg::OnChange() [`Qp;_K?t  
{ Gct&}]3pm  
 RegisterHotkey(); 0%q ctZy  
} YP .%CD(K  
VAF:Z  
BOOL CCaptureDlg::RegisterHotkey() R.T?ZF  
{ ki*79d"$  
 UpdateData(); "I}'C^gP  
 UCHAR mask=0; Y|x6g(b  
 UCHAR key=0; WW8YB"  
 if(m_bControl) 6/V{>MTZg  
  mask|=4; bz}AO))Hk  
 if(m_bAlt) xRTg [  
  mask|=2; vBCZ/F[  
 if(m_bShift) [# tT o;q  
  mask|=1; pT_e;,KW U  
  key=Key_Table[m_Key.GetCurSel()]; :(S/$^U  
 if(bRegistered){ @tjZvRtZ  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %xbz&'W,  
  bRegistered=FALSE; &ls!IN  
 } =?I1V#.  
 cMask=mask; Z|cTzunp  
 cKey=key; a dz;N;rIY  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); gqHH Hh  
 return bRegistered; &]"_pc/>m  
} go%X%Os]  
nkCRe  
  四、小结 ./BP+\)l O  
*~t$k56  
  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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