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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: b09xf"D  
  q5'G]j{,Z  
  一、实现方法 |0}7/^  
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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: /93z3o7D>  
gH\>", [  
#pragma data_seg("shareddata") l}/&6hI+d  
HHOOK hHook =NULL; //钩子句柄 8TP~=qU  
UINT nHookCount =0; //挂接的程序数目 #=33TvprR2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码  G +41D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 "Y&   
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /~f[>#  
static int KeyCount =0; Bmcc SC;o4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 m6$&yKQ-=h  
#pragma data_seg() DLqH*U  
 (FaYagD  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 =s]2?m  
r `n|fD.  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: j2u'5kJ G  
5y\35kT'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR y"'p#j  
cKey,UCHAR cMask) KF1iYo>p  
{ cg17e  
 BOOL bAdded=FALSE; d^!k{Qx'  
 for(int index=0;index<MAX_KEY;index++){ C7*YZe  
  if(hCallWnd[index]==0){ W;UPA~nT~  
   hCallWnd[index]=hWnd; |uw48*t  
   HotKey[index]=cKey; v {uq  
   HotKeyMask[index]=cMask; 2 rf8)8':  
   bAdded=TRUE; ge6S_"  
   KeyCount++; ?< teHFj  
   break; {Bk` Zlki  
  } k3@d = k  
 } /Wjc\n$'  
 return bAdded; <2&qIvHL  
} 0a8\{(w  
//删除热键 8]`s&d@GY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Qj_)^3`e  
{ . !Z5A9^  
 BOOL bRemoved=FALSE; FA)ot)]  
 for(int index=0;index<MAX_KEY;index++){ a3\~AO H%  
  if(hCallWnd[index]==hWnd){ g'7\WQ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ N|2d9E  
    hCallWnd[index]=NULL; a{^z= =  
    HotKey[index]=0; 4dCXBTT  
    HotKeyMask[index]=0; .PVYYhrt  
    bRemoved=TRUE; Y9<[n)>+  
    KeyCount--; FK~wr;[  
    break; :.]EM*p?GV  
   } b+J|yM<`  
  } ht]n*  
 } Q[K$f%>  
 return bRemoved; oST)E5X;7  
} 7z1@XO<D  
L FJ@4]%V  
+p Ywc0~  
  DLL中的钩子函数如下: 7qOkv1.}0  
)D6 i {I0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) gWa0x-  
{ Xn%7{%;h  
 BOOL bProcessed=FALSE; [m h>N$  
 if(HC_ACTION==nCode) `^hA&/1  
 { |gP)lR  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *P/A&"i[E  
   switch(wParam) zNrn|(Y%Y  
   {  Q5Nbu90  
    case VK_MENU: r /a@ x9  
     MaskBits&=~ALTBIT; gL&w:_  
     break; @S}j=k  
    case VK_CONTROL: n/Fxjf0W  
     MaskBits&=~CTRLBIT; fg#e*7Odn  
     break; _rIo @v  
    case VK_SHIFT: wZ\93W-}  
     MaskBits&=~SHIFTBIT; X;6;v]  
     break; [qRww]g;P|  
    default: //judge the key and send message H7&y79mB  
     break; hp2E! Cma  
   } bF_0',W  
   for(int index=0;index<MAX_KEY;index++){ 6:B,ir _  
    if(hCallWnd[index]==NULL) TsoxS/MI"  
     continue; c|9g=DjK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2ns,q0I A  
    { ?;`GCE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); JcmMbd&B  
     bProcessed=TRUE; *v K~t|z  
    } a BMV6'  
   } pqpsa'  
  } ?#:']q  
  else if((lParam&0xc000ffff)==1){ //有键按下 > TCit1yD  
   switch(wParam) G`0{31us  
   { l9eTghLi  
    case VK_MENU: .U|'KCM9m  
     MaskBits|=ALTBIT; ,"#nJC  
     break; hf9i%,J  
    case VK_CONTROL: HP[B%  
     MaskBits|=CTRLBIT; {-me;ayk  
     break; exiu;\+j  
    case VK_SHIFT: SUMfebW5  
     MaskBits|=SHIFTBIT; fDB. r$|d  
     break; 4C_1wk('  
    default: //judge the key and send message [j@i^B &  
     break; zzI,iEG  
   }  gvo98Id  
   for(int index=0;index<MAX_KEY;index++){ NR_3nt^h  
    if(hCallWnd[index]==NULL) \ { QH^  
     continue; urx?p^c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J9 NuqV3  
    { gTTKjlI [  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R,PN?aj  
     bProcessed=TRUE; yQj J-g(.  
    } af>i  
   } T|S-?X,  
  } Y1sK sdV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 i7h^L)M  
   for(int index=0;index<MAX_KEY;index++){ 0Q7<;'m  
    if(hCallWnd[index]==NULL) $+4 4US  
     continue; 13v`rK`7o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Y]`=cR`/"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XZ@+aG_%q  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *lLCH,  
   } URm<Ji  
  } PZV>A!7C8n  
 } Z9 ws{8@_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]$ s)6)kW  
} V*te8HIe  
]Bf1p  
  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: cW0\f5[/  
VM<0_R24z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W9c&"T9JT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5TuwXz1v  
e#mf{1&  
  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: <BBzv-?D  
K*Ba;"Ugeg  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) !*&5O~dfN  
{ w ]T_%mdk  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) fI0"#i v}  
 { P(8Yz W  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (NR( )2  
  SaveBmp(); `&fW<5-  
  return FALSE; dPpQCx f  
 } ~x'8T!M{  
 …… //其它处理及默认处理 b&h'>(  
} Q!IqvmO  
lW#2ox  
RY)x"\D  
  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。 Z P|k3   
]Ri=*KZa  
  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。 + XBF,<P  
A ?V-Sz#  
  二、编程步骤 ) aMiT  
P6>C+T1  
  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"; qlPIxd  
gfAWN  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; #| g h  
_8 K|2$X  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; xh#_K@8  
LHZsmUM(dg  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; /O.q4p  
R{A$|Ipaq  
  5、 添加代码,编译运行程序。 KV;q}EyG  
k3B_M9>!  
三、程序代码 ; t9_*)[  
h2mHbe43  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL \oxf_4X  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) A~E S{Zkh  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8irTGA  
#if _MSC_VER > 1000 X{!,j}  
#pragma once R'B_YKHBY  
#endif // _MSC_VER > 1000 Oz(=%oS  
#ifndef __AFXWIN_H__ kP('X/  
#error include 'stdafx.h' before including this file for PCH M+ <SSi"  
#endif b9?Vpu`?  
#include "resource.h" // main symbols 5GJkvZtFY  
class CHookApp : public CWinApp =<9Mv+Ry8  
{ 'Tqusr>lPY  
 public:  n9&fH  
  CHookApp(); 8|i<4>  
  // Overrides  Y~^R^J  
  // ClassWizard generated virtual function overrides $;ny`^8  
  //{{AFX_VIRTUAL(CHookApp) 8#A4B2  
 public: \A\?7#9\  
  virtual BOOL InitInstance(); 525^/d6v  
  virtual int ExitInstance(); K`X'Hg#_P2  
  //}}AFX_VIRTUAL 94 6r#`q  
  //{{AFX_MSG(CHookApp) .%W.uF^  
  // NOTE - the ClassWizard will add and remove member functions here. sEw ?349Bz  
  // DO NOT EDIT what you see in these blocks of generated code ! }8"i~>>a  
  //}}AFX_MSG fYZd:3VdC  
  DECLARE_MESSAGE_MAP() A\7sP =  
}; _f>)G3p  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); NzhWGr_x'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U_aI!`WXd  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G1zP^ogk  
BOOL InitHotkey(); #>~A-k)  
BOOL UnInit(); w-km qh  
#endif C{l-l`:  
NhYUSk ~u  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QjpJIw  
#include "stdafx.h" "BpDlTYM  
#include "hook.h" vYLspZ;S  
#include <windowsx.h> S%?>Mh?g  
#ifdef _DEBUG &dw=jHt  
#define new DEBUG_NEW I}y6ke!  
#undef THIS_FILE W!9~bBF',  
static char THIS_FILE[] = __FILE__; o^d|/;  
#endif rWO#h{  
#define MAX_KEY 100 bqF?!t<B  
#define CTRLBIT 0x04 (C`nBiL<  
#define ALTBIT 0x02  v1?G  
#define SHIFTBIT 0x01 n2c(x\DA&  
#pragma data_seg("shareddata") (<OmYnm  
HHOOK hHook =NULL; T51oNO%^  
UINT nHookCount =0; *j1Skd.#At  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !](Mt?e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT TOP,]N/F H  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :TnU}i_/h  
static int KeyCount =0; zC[LcC*+J  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift w*@9:+  
#pragma data_seg() I~"l9Jc!"  
HINSTANCE hins; 'f %oL/,  
void VerifyWindow(); rniL+/-uU  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) TOq xl  
//{{AFX_MSG_MAP(CHookApp) ~_ovQ4@  
// NOTE - the ClassWizard will add and remove mapping macros here. MD4m h2  
// DO NOT EDIT what you see in these blocks of generated code!  ]5ibg"{S  
//}}AFX_MSG_MAP q~AvxO  
END_MESSAGE_MAP() vu*{+YpH  
Q3t%JP>;g  
CHookApp::CHookApp() =q"0GUei3  
{ -biw{  
 // TODO: add construction code here, X^m @*,[s  
 // Place all significant initialization in InitInstance V0#E7u`4  
} Vj)"?|V  
4 #lLC-k  
CHookApp theApp; y^{ 4}^u-^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) oc-o>H  
{ j~;y~Cx?  
 BOOL bProcessed=FALSE; [P)](8nR[  
 if(HC_ACTION==nCode) 5*B'e{C  
 { n|QA\,=  
  if((lParam&0xc0000000)==0xc0000000){// Key up QqeF   
   switch(wParam) )kKeA  
   { %$_?%X0=t  
    case VK_MENU: vKkvB;F41  
     MaskBits&=~ALTBIT;  1&=2"  
     break; rX`fjS*C  
    case VK_CONTROL: VWCC(YRU|$  
     MaskBits&=~CTRLBIT; K TE*Du  
     break; DuQ:82 3b  
    case VK_SHIFT: lKRp9isn^  
     MaskBits&=~SHIFTBIT; >M m.MNU  
     break; `"iPJw14  
    default: //judge the key and send message t#]VR7]  
     break; 8L@@UUjr  
   } dW^#}kN7V  
   for(int index=0;index<MAX_KEY;index++){ ~ :B/`1[m  
    if(hCallWnd[index]==NULL) :}v:=ck  
     continue; c Ct5m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dsK ^-e6:5  
    { f,-'eW/j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cZt5;"xgr]  
     bProcessed=TRUE; G%%F6)W  
    } r9-)+R J  
   } `E>o:tff  
  } %+ MYg^  
  else if((lParam&0xc000ffff)==1){ //Key down |ew:}e: k<  
   switch(wParam) kY~yA2*G  
   { "KY]2v.  
    case VK_MENU: bG)6p05Oa  
     MaskBits|=ALTBIT; `-rtU  
     break; yN}<l%  
    case VK_CONTROL: Z>'hNj)ju  
     MaskBits|=CTRLBIT; <S@2%%W  
     break; kw1Lm1C  
    case VK_SHIFT: LyNur8 Zi  
     MaskBits|=SHIFTBIT; vZSwX@0  
     break; WMoRosL74  
    default: //judge the key and send message ?Y$3R"p@3`  
     break; /q`f3OV"  
   } -]Oi/i,{  
   for(int index=0;index<MAX_KEY;index++) wS:`c J  
   { C[JPohm  
    if(hCallWnd[index]==NULL) lWU? R  
     continue; &G+:t)|S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Pv8AWQQJ  
    { ^DR`!.ttr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); V}G; oz&>)  
     bProcessed=TRUE; .ityudT<  
    } Lb2/ Te*  
   } +$G P(Uu,  
  } %vrUk;<35  
  if(!bProcessed){ a'\fS7aE0l  
   for(int index=0;index<MAX_KEY;index++){ sQY0Xys<4  
    if(hCallWnd[index]==NULL) D_I_=0qNd  
     continue; ?kc,}/4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) A^ry|4`3(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); sJLJVSv8c  
   } ZpU4"x>  
  } ?eR^\-e  
 } bEzy KrN\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,<CzS,(  
} js=w!q0)9  
ns8I_H  
BOOL InitHotkey() r P&.`m88n  
{ N5fMMi(O  
 if(hHook!=NULL){ E`3[62C  
  nHookCount++; /vFdhh  
  return TRUE; `ve5>aw0_Y  
 } Cx`?}A\%  
 else &eX^ll  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %|?PG i@5  
  if(hHook!=NULL) e&="5.ik  
   nHookCount++; _&F*4t!n_  
  return (hHook!=NULL); XE*#5u8t  
}  *U4eL-  
BOOL UnInit() ]3yaIlpD1  
{ =)XC"kU p  
 if(nHookCount>1){ fTA%HsvU:  
  nHookCount--; G]fx3=  
  return TRUE; knu>{a}  
 } qznd '^[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ? $X1X`@  
 if(unhooked==TRUE){ km!jxs  
  nHookCount=0; l,M?   
  hHook=NULL; kR(hUc1O  
 } v!?>90a  
 return unhooked;  jQ?6I1o  
} >PiEu->P,  
Tk0Senq,  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) / CVhvK  
{ (K->5rSU  
 BOOL bAdded=FALSE; ^<'=]?xr  
 for(int index=0;index<MAX_KEY;index++){ =wX(a  
  if(hCallWnd[index]==0){ W-@}q}A  
   hCallWnd[index]=hWnd; 9.$k^|~  
   HotKey[index]=cKey; FDO$(&  
   HotKeyMask[index]=cMask; d+Jj4OnP  
   bAdded=TRUE; x AR9* <-  
   KeyCount++; FFqqAT5  
   break; \P0>TWE  
  } @,v.Y6Ge  
 } aUX.4#|%  
 return bAdded; FOd)zU*L2  
} @phb5  
>`c-Fqk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YXhxzH hPd  
{ 2AI~Jm#  
 BOOL bRemoved=FALSE; M2e_)f:  
 for(int index=0;index<MAX_KEY;index++){ *J] }bX  
  if(hCallWnd[index]==hWnd){ IHtNaN )  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k9?fE  
    hCallWnd[index]=NULL; D>Dch0{H,:  
    HotKey[index]=0; ey>V^Fj  
    HotKeyMask[index]=0; r@Tq-o  
    bRemoved=TRUE; x0_$,Tz@  
    KeyCount--; Mk@%Wuxg2  
    break; x*uQBNf=  
   } oefhJM!y  
  } =h9&`iwiu  
 } Qyoly"b@  
 return bRemoved; k~ZE4^dM  
} 9.qjEe  
d@-bt s&3  
void VerifyWindow() 0(!D1G{ul  
{ 8(c,b  
 for(int i=0;i<MAX_KEY;i++){ Mm+kG'Z!S  
  if(hCallWnd!=NULL){ &c)n\x*  
   if(!IsWindow(hCallWnd)){ =tE7XC3X_  
    hCallWnd=NULL; 1zUo.Tg0  
    HotKey=0; k&PxhDf  
    HotKeyMask=0; <Sx-Ca7  
    KeyCount--; P Yp<eo\  
   } R3SAt-IE  
  } kG>d^K  
 } ^ LT KX`p  
} UfnjhHu  
w(KB=lA2  
BOOL CHookApp::InitInstance() =N%;HfUD  
{ ~ g\GC  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qZ6Mk9@M  
 hins=AfxGetInstanceHandle(); LD~/*  
 InitHotkey(); \]eB(&nq  
 return CWinApp::InitInstance(); %4~2  
} $($26g  
Oi=c 6n  
int CHookApp::ExitInstance() G 'sEbw'[  
{ & A%*sD6  
 VerifyWindow(); - W5ml @  
 UnInit(); N>S_Vgk}  
 return CWinApp::ExitInstance(); 5[_|+  
} '%$)"g]/#  
Z2,[-8,Kx  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [80L|?, *  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) OTNcNY  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Lgh. 1foK  
#if _MSC_VER > 1000 &nk[gb o\  
#pragma once G92Ya^`  
#endif // _MSC_VER > 1000 ~al4`:rRx1  
ivKhzU+  
class CCaptureDlg : public CDialog YVMwb@|  
{ Rs<li\GS  
 // Construction CVp`G"W:  
 public: :eIu<_,}  
  BOOL bTray; `is."]%f  
  BOOL bRegistered; Ne)H*DT  
  BOOL RegisterHotkey(); \/Z?QBFvz  
  UCHAR cKey; cZ{-h  
  UCHAR cMask; yrnIQu*Uu  
  void DeleteIcon(); 4ACL|RF)A  
  void AddIcon(); mgk<PY  
  UINT nCount; 0Y8Si^T  
  void SaveBmp(); :qbbo~U  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <lj;}@qQ<  
  // Dialog Data j~d<n_   
  //{{AFX_DATA(CCaptureDlg) jU~ ! *]  
  enum { IDD = IDD_CAPTURE_DIALOG }; `J%iFm/5*  
  CComboBox m_Key; $y\\ ?  
  BOOL m_bControl; F|t3%dpj  
  BOOL m_bAlt; 2aef[TY  
  BOOL m_bShift; =N5~iMorD-  
  CString m_Path; lj{Jw.t  
  CString m_Number; b42"Y,sbB  
  //}}AFX_DATA >8$]g  
  // ClassWizard generated virtual function overrides hP1H/=~  
  //{{AFX_VIRTUAL(CCaptureDlg) |]tIE{d  
 public:  0(2r"Hi  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9%i|_c}  
 protected: o\oS_f:RD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p_x@FA(  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %z}{jqD&:X  
  //}}AFX_VIRTUAL /~?'zr  
  // Implementation biJ"@dm 4  
 protected: 66G$5  
  HICON m_hIcon; 8cV3VapF  
  // Generated message map functions Flrpk`4  
  //{{AFX_MSG(CCaptureDlg) =.Tc l"O[  
  virtual BOOL OnInitDialog(); sOegR5?;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); h/7m.p]  
  afx_msg void OnPaint(); Bg"KNg  
  afx_msg HCURSOR OnQueryDragIcon(); 95 7Cr  
  virtual void OnCancel(); 8.S&J6  
  afx_msg void OnAbout(); =i_ s#v[Y  
  afx_msg void OnBrowse(); r~&[Gaw  
  afx_msg void OnChange(); Q Q3a&  
 //}}AFX_MSG \>b :  
 DECLARE_MESSAGE_MAP() EZ6\pyNB0#  
}; yHY \4OHS  
#endif .DzFt c  
0}a="`p#<  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 5C}1iZEJ  
#include "stdafx.h" K"%_q$[YQ  
#include "Capture.h" zJhG`iWFw  
#include "CaptureDlg.h" 3oH.1M/  
#include <windowsx.h> 73b(A|kQ@  
#pragma comment(lib,"hook.lib") ?Vy% <f$  
#ifdef _DEBUG v1s.j2T  
#define new DEBUG_NEW n]?KDID;  
#undef THIS_FILE (%&HufT  
static char THIS_FILE[] = __FILE__; Sn(e@|!G  
#endif S?ypka"L  
#define IDM_SHELL WM_USER+1 tVB9kxtE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F }/tV7m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nH6Ny  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 6FYO5=R  
class CAboutDlg : public CDialog Y[=X b  
{ `QpkD8  
 public: F/91Es  
  CAboutDlg(); R^DZ@[\iV  
  // Dialog Data kj$Ks2!W  
  //{{AFX_DATA(CAboutDlg) &:K!$W  
  enum { IDD = IDD_ABOUTBOX }; 2U;6sn*e  
  //}}AFX_DATA =UGyZV:z5  
  // ClassWizard generated virtual function overrides E}7@?o7u}  
  //{{AFX_VIRTUAL(CAboutDlg) q%g!TFMg  
 protected: cPFs K*w  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fl8~*\;Xu  
  //}}AFX_VIRTUAL M0+xl+c+  
  // Implementation ,".1![b  
 protected: |ia#Elavo  
  //{{AFX_MSG(CAboutDlg) P2U^%_~  
  //}}AFX_MSG b0QC91   
  DECLARE_MESSAGE_MAP() PV[ Bqt  
}; X+0+ }S  
>bwB+-lyL  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [{}Hk%wlX  
{ z|p C*1A\  
 //{{AFX_DATA_INIT(CAboutDlg) s7"NK"  
 //}}AFX_DATA_INIT Ol%KXq[  
} t)!(s,;T  
~pv|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Y (a0*fh  
{ } D'pyTf[  
 CDialog::DoDataExchange(pDX); rKhhx   
 //{{AFX_DATA_MAP(CAboutDlg) z( 00"ei  
 //}}AFX_DATA_MAP >-%tvrS%  
} }Kt`du=  
=tkO^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) QD2;JI2  
 //{{AFX_MSG_MAP(CAboutDlg) pTQ70V3  
 // No message handlers ZGa;'  
 //}}AFX_MSG_MAP `#/0q*$  
END_MESSAGE_MAP() *H2@lrc  
zJ"`40V*;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0bl?dOV{  
: CDialog(CCaptureDlg::IDD, pParent) I34|<3t$  
{ t<F*ODn  
 //{{AFX_DATA_INIT(CCaptureDlg) `(2Y%L(r  
  m_bControl = FALSE; e-Pn,j  
  m_bAlt = FALSE; <"GgqyRzv  
  m_bShift = FALSE; CyR1.|!@  
  m_Path = _T("c:\\"); \LN!k-c  
  m_Number = _T("0 picture captured."); ~AvB5  
  nCount=0; -nHt6AbqP  
  bRegistered=FALSE; K:<j=j@51  
  bTray=FALSE; AmyZ9r#{  
 //}}AFX_DATA_INIT '<Fr}Cn  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4r+@7hnK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %1oh+'ES F  
} O`M 6 =\  
f/?uo sS  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6Z}8"VJr {  
{ (aeS+d x  
 CDialog::DoDataExchange(pDX); X[e:fW[e)  
 //{{AFX_DATA_MAP(CCaptureDlg) Q\QSnMM&]  
  DDX_Control(pDX, IDC_KEY, m_Key); EE{]EW(  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *F^t)K2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *eF'<._[U  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ^MXW,xqb  
  DDX_Text(pDX, IDC_PATH, m_Path); L?Fb}  
  DDX_Text(pDX, IDC_NUMBER, m_Number); H Q_IQ+  
 //}}AFX_DATA_MAP q6]T;)U&  
} >bLhCgF:"  
F|wT']1Y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Bn4wr  
//{{AFX_MSG_MAP(CCaptureDlg) '{ $7Dbo  
 ON_WM_SYSCOMMAND() nT:F{2 M;  
 ON_WM_PAINT() VUneCt%  
 ON_WM_QUERYDRAGICON() 85}S8\_u  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Os rHA  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]B2%\}c  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PxvD0GTW  
//}}AFX_MSG_MAP ` P,-NVB  
END_MESSAGE_MAP() 59@PY!c>  
S/2lK*F  
BOOL CCaptureDlg::OnInitDialog() J4woZ{d  
{ ZL7#44  
 CDialog::OnInitDialog(); !*\ J4bJe  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _w.H]`C!X  
 ASSERT(IDM_ABOUTBOX < 0xF000); BwJL)$D<S  
 CMenu* pSysMenu = GetSystemMenu(FALSE); O{<uW-  
 if (pSysMenu != NULL) p=d,kY  
 { qlNB\~HCe  
  CString strAboutMenu; ,SF>$ .  
  strAboutMenu.LoadString(IDS_ABOUTBOX); H#+2l?D:"  
  if (!strAboutMenu.IsEmpty()) {Qf/.[  
  { 9<|nJt  
   pSysMenu->AppendMenu(MF_SEPARATOR); B>kVJK`X  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); CZzgPId%x  
  } _kZ&t_]  
 } ,Qh9}I7;C  
 SetIcon(m_hIcon, TRUE); // Set big icon %W8*vSbx  
 SetIcon(m_hIcon, FALSE); // Set small icon SR$?pJh D%  
 m_Key.SetCurSel(0); U>-GM >  
 RegisterHotkey(); _qf$dGqc  
 CMenu* pMenu=GetSystemMenu(FALSE); 0 3?7kAI  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c!ul9Cw  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1G}\IK1+  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \gW6E^  
 return TRUE; // return TRUE unless you set the focus to a control ev[!:*6P  
} \hO}3;*&  
c$n`=NI  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?X'l&k>  
{ n|'}W+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) CxV$_J  
 { Ywo=w:'  
  CAboutDlg dlgAbout; <*@!>6mS  
  dlgAbout.DoModal(); GTocN1,Z~a  
 } $lAQcG&Q  
 else :m[HUh  
 { (RBB0CE  
  CDialog::OnSysCommand(nID, lParam); peZ'sZ6  
 } ( d1ho=  
} #GfM!<q<  
iGw\A!}w\  
void CCaptureDlg::OnPaint() ,opS)C$  
{ nj <nW5[  
 if (IsIconic()) Ru~;awV?  
 { 'h#>@v> }  
  CPaintDC dc(this); // device context for painting 3>#io^35  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w\}Q.$@  
  // Center icon in client rectangle wu;^fL  
  int cxIcon = GetSystemMetrics(SM_CXICON); FwpTQix!  
  int cyIcon = GetSystemMetrics(SM_CYICON); y6P-:f/&*  
  CRect rect; Q- }cB  
  GetClientRect(&rect); x4CSUcKb  
  int x = (rect.Width() - cxIcon + 1) / 2; +ZJ1> n  
  int y = (rect.Height() - cyIcon + 1) / 2; AkEt=vI  
  // Draw the icon Ewa/6=]LA  
  dc.DrawIcon(x, y, m_hIcon); Rebo.6rG  
 } v VFT0_  
 else ;XI=Y"h{%  
 { U1=]iG<%  
  CDialog::OnPaint(); i{7Vh0n3S-  
 } 0/JTbf. CX  
} \y0]BH  
THcX.%ToT  
HCURSOR CCaptureDlg::OnQueryDragIcon() H03R?S9AQ  
{ Jl fIYf~  
 return (HCURSOR) m_hIcon; G DwijZw  
} h%ba!  
*lBX/O`=  
void CCaptureDlg::OnCancel() vxk~( 3]<)  
{ ZJ%iiY  
 if(bTray) D"<>! ]@(a  
  DeleteIcon(); *@fVogr^  
  CDialog::OnCancel(); a\xf\$Ym  
} DoFF<LXBt  
^TqR0a-*  
void CCaptureDlg::OnAbout() ?#|in}  
{ O6b.oS '-  
 CAboutDlg dlg; ,H@ x.  
 dlg.DoModal(); $p\0/  
} `C)|}qcC  
| W<jN  
void CCaptureDlg::OnBrowse() T5+ (Fz  
{ rds0EZ4W  
 CString str; ;edt["Eu  
 BROWSEINFO bi; 7xfN}iHG  
 char name[MAX_PATH]; [g@ .dr3t  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yC9~X='D  
 bi.hwndOwner=GetSafeHwnd(); >_u5"&q  
 bi.pszDisplayName=name; DxzNg_E]  
 bi.lpszTitle="Select folder"; +|.6xC7U  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; B18?)LA  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); BUU ) Sz  
 if(idl==NULL) #F:\_!2c  
  return; 4=ZN4=(_[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0:zDt~Ju  
 str.ReleaseBuffer(); r~;TId} #  
 m_Path=str; DC,]FmWs!+  
 if(str.GetAt(str.GetLength()-1)!='\\') I8XU '  
  m_Path+="\\"; _MzdbUb5,  
 UpdateData(FALSE); nT%<!/}!  
} g acE?bW'  
AxiCpAS;J  
void CCaptureDlg::SaveBmp() FK,Jk04on  
{ dRXdV7-!  
 CDC dc; ZWy,NN1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); F=V_ACU  
 CBitmap bm;  m8z414o  
 int Width=GetSystemMetrics(SM_CXSCREEN); m$A-'*'  
 int Height=GetSystemMetrics(SM_CYSCREEN); C''[[sw'K  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Z]k+dJ[-  
 CDC tdc; vU!<-T#  
 tdc.CreateCompatibleDC(&dc); $m0-IyXcv  
 CBitmap*pOld=tdc.SelectObject(&bm); ntD8:%m  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "/zDcZbL;  
 tdc.SelectObject(pOld); Kc {~Q  
 BITMAP btm; y9-}LET3j  
 bm.GetBitmap(&btm); X  m%aT  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 7=@Mn F`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); "xE;IpO[  
 BITMAPINFOHEADER bih; xi!R[xr1  
 bih.biBitCount=btm.bmBitsPixel; cQ`+ A|q  
 bih.biClrImportant=0; 0 rilg  
 bih.biClrUsed=0; H JjW  
 bih.biCompression=0; (!dwUB  
 bih.biHeight=btm.bmHeight; TuMD+^x  
 bih.biPlanes=1; @EGUQ|WL^  
 bih.biSize=sizeof(BITMAPINFOHEADER); LO;Z3Q>#0  
 bih.biSizeImage=size; RLUH[[  
 bih.biWidth=btm.bmWidth; IjrjLp[z$  
 bih.biXPelsPerMeter=0; V>B*_J,z.  
 bih.biYPelsPerMeter=0; #brV{dHV,  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); L`0}wR?+  
 static int filecount=0; Z=y^9]  
 CString name; KGsW*G4U=  
 name.Format("pict%04d.bmp",filecount++); (#VF>;;L  
 name=m_Path+name; Bt1 &C?_$T  
 BITMAPFILEHEADER bfh; b`X"yg+  
 bfh.bfReserved1=bfh.bfReserved2=0; 9|&%"~6'  
 bfh.bfType=((WORD)('M'<< 8)|'B'); #{Gojg`5O  
 bfh.bfSize=54+size; g TqtTd~L  
 bfh.bfOffBits=54; N0']t Gh2  
 CFile bf; I cz) Qtg|  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f*GdHUZ*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); S0-/9h  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 4P$#m<;t  
  bf.WriteHuge(lpData,size); .[hbiv#  
  bf.Close(); e(;nhU3a*,  
  nCount++; I DtGtkF  
 } XCku[?Ix  
 GlobalFreePtr(lpData); [iT#Pu5  
 if(nCount==1) x#&%lJT  
  m_Number.Format("%d picture captured.",nCount); 7Jvb6V<R  
 else Odj4)   
  m_Number.Format("%d pictures captured.",nCount); o_DZ  
  UpdateData(FALSE); ]2'{W]m  
} rd4\N2- 6  
@Z%I g  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) U{~R39  
{ _+x&[^gjP  
 if(pMsg -> message == WM_KEYDOWN) o9D]\PdL>  
 { DeL7sU  
  if(pMsg -> wParam == VK_ESCAPE) E/N*n!sV  
   return TRUE; z\Y-8a.]  
  if(pMsg -> wParam == VK_RETURN) Q.]RYv}\  
   return TRUE; ziBg'  
 } ]aVFWzey  
 return CDialog::PreTranslateMessage(pMsg); mtu`m6Xix  
} a]u1_ $)  
*O@uF4+!1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @Zd/>'  
{ ZsikI@?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ czHbdEh  
  SaveBmp(); =lqBRut  
  return FALSE; ;*_U)th  
} I%fz^:[#<  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y:N>t+'5  
 CMenu pop; 0(~,U!g[=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3-Xc3A=w  
 CMenu*pMenu=pop.GetSubMenu(0); C!r9+z)<  
 pMenu->SetDefaultItem(ID_EXITICON); nkvkHh  
 CPoint pt; rlIDym9nY~  
 GetCursorPos(&pt); d %Z+.O  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); CUo %i/R  
 if(id==ID_EXITICON) 9x0Ao*D<t  
  DeleteIcon(); |6}:n,KA.  
 else if(id==ID_EXIT) Sx%vJYH0  
  OnCancel(); WSPlM"h  
 return FALSE; `&-)(#  
} yhi6RDS  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _N-JRM m<  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) iSz?V$}?  
 AddIcon(); 'aoHNZfxw  
 return res; }R -azN;  
} Q #%C)7)  
Q~p[jQ,4wZ  
void CCaptureDlg::AddIcon() ]C me)&hX  
{ t6H9Q>*  
 NOTIFYICONDATA data; Z>#MTxU(  
 data.cbSize=sizeof(NOTIFYICONDATA); O-ZB4hN8  
 CString tip; |p1 pa4%}  
 tip.LoadString(IDS_ICONTIP); (ON_(MN  
 data.hIcon=GetIcon(0); j. L`@  
 data.hWnd=GetSafeHwnd(); D3+UV+&R/  
 strcpy(data.szTip,tip); 0^PI&7A?y  
 data.uCallbackMessage=IDM_SHELL; ^%qh E8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .g6DKjy>  
 data.uID=98; M!ra3Y  
 Shell_NotifyIcon(NIM_ADD,&data); ix=H=U]Q{  
 ShowWindow(SW_HIDE); (YJ]}J^  
 bTray=TRUE; j 4B|ktf  
} ^YLpZoo  
}m6j6uAR6)  
void CCaptureDlg::DeleteIcon() '<YVDB&-d,  
{ _(<D*V[  
 NOTIFYICONDATA data; 1li1&  
 data.cbSize=sizeof(NOTIFYICONDATA); !Y3 *\  
 data.hWnd=GetSafeHwnd(); K{)YnY_E;  
 data.uID=98; V\V:uo(C  
 Shell_NotifyIcon(NIM_DELETE,&data); ] EzX$T  
 ShowWindow(SW_SHOW); mfNYN4Um6  
 SetForegroundWindow(); *?#t (Y[  
 ShowWindow(SW_SHOWNORMAL); ,^_aqH  
 bTray=FALSE; '0!IF&p'  
} jJmg9&^R  
Ih!D6  
void CCaptureDlg::OnChange() "c  S?t  
{ %7$oig\wE  
 RegisterHotkey(); S}rW=hO  
} -O ro$=%  
LK^t ](F  
BOOL CCaptureDlg::RegisterHotkey() mQOYjy3  
{ <A,G:&d~  
 UpdateData(); :  Jh  
 UCHAR mask=0; v&>TU(x\H  
 UCHAR key=0; Z-!W#   
 if(m_bControl) #z\{BtK  
  mask|=4; Q7]VB p4  
 if(m_bAlt) }Dig'vpMx  
  mask|=2; btC.EmX  
 if(m_bShift) o9:GKc  
  mask|=1; F+`DfI]/m  
  key=Key_Table[m_Key.GetCurSel()]; 3??*G8Yp  
 if(bRegistered){ B(GcPDj(K  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); % DQ.f*%  
  bRegistered=FALSE; OudD1( )W  
 } ]g/% w3G  
 cMask=mask; a%-P^M;a2  
 cKey=key;  psg}sl/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); EuAJ.n  
 return bRegistered; "KY9MBzPD  
} xpf\S10e  
3eV(2  
  四、小结 43mV~Oj  
 4^L+LY  
  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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