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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: %gMpV  
  -NPk N%h  
  一、实现方法 0o|,& K  
_A|\.(t  
  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: otVyuh  
_Af4ct;ng  
#pragma data_seg("shareddata") N&ql(#r  
HHOOK hHook =NULL; //钩子句柄 IVzA>Vd  
UINT nHookCount =0; //挂接的程序数目 j& o+KV  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 tN3 {7'\7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 wmr%h q  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey b2=Q~=Wc  
static int KeyCount =0; +Jka:]MW!  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 px>> ]>ZMH  
#pragma data_seg() U9o*6`"o  
OPY/XKyY,  
  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。 !(_xu{(DL  
H8BO*8}  
  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: 7oe@bS/Z  
y}-S~Ov>I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .(1j!B4^  
cKey,UCHAR cMask) 0^&R7Rv c  
{ xnQGCw?S&}  
 BOOL bAdded=FALSE; O 4Pd N?  
 for(int index=0;index<MAX_KEY;index++){ :_\!t45  
  if(hCallWnd[index]==0){ E9d i  
   hCallWnd[index]=hWnd; q uGPk)c  
   HotKey[index]=cKey; UVCMB_T  
   HotKeyMask[index]=cMask; 01c/;B  
   bAdded=TRUE; X_({};mz  
   KeyCount++; <SM&VOiaOz  
   break; M}oj!xGB  
  } 5652'p  
 } .(dmuV9  
 return bAdded; V=4u7!ha  
} ;k&k#>L!K  
//删除热键 #Wm@&|U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ROt0<^<  
{ vx5o k1UY  
 BOOL bRemoved=FALSE; tbzvO<~  
 for(int index=0;index<MAX_KEY;index++){ q\b ?o!# _  
  if(hCallWnd[index]==hWnd){ ,o>pmaoLs  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ eN<pU%7  
    hCallWnd[index]=NULL; \m~\,em  
    HotKey[index]=0; jbhJ;c:  
    HotKeyMask[index]=0; x\bRj>%(  
    bRemoved=TRUE; W8yfa[z~J  
    KeyCount--; ;Q>3N(  
    break; @j\?h$A/  
   } v8vh~^X%P  
  } ({_:^$E\  
 } )Kk(P/s  
 return bRemoved; Fma`Cm.  
} mf;^b.mKh  
t6%xit+  
FP'u)eU&3  
  DLL中的钩子函数如下: SeZT4y*=  
G E~(N N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &iND&>?  
{ Xq^y<[  
 BOOL bProcessed=FALSE; ^z%o];  
 if(HC_ACTION==nCode) }M9DqZ;I  
 { E #{WU}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i3 l #~  
   switch(wParam) [mB(GL  
   {  rxgVT4  
    case VK_MENU: tY$ty0y-e  
     MaskBits&=~ALTBIT; ]k`Fl,"  
     break; 4'{hI;&a&  
    case VK_CONTROL: /romTK4  
     MaskBits&=~CTRLBIT; jRdhLs,M9  
     break; i9@;,4f  
    case VK_SHIFT: b?2X>QJ  
     MaskBits&=~SHIFTBIT; {c\oOM<7  
     break; ]~ #+ b>  
    default: //judge the key and send message `^&15?Wk  
     break; emkMR{MY  
   } bDZKQ&  
   for(int index=0;index<MAX_KEY;index++){ D=82$$  
    if(hCallWnd[index]==NULL) Rd vPsv} D  
     continue; \+?,c\x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wq{d8|)1  
    { {80oRD2=Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); r8 Zyld_@  
     bProcessed=TRUE; x^#6>oOR  
    } (w#slTFT  
   } 5y[b8mur  
  } LA;V}%y ?  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~^%0V<*-}  
   switch(wParam) K?FX<PT  
   { [aWDD[#j~  
    case VK_MENU: 5&-j{J0iV  
     MaskBits|=ALTBIT; T[4[/n> i  
     break; =!g/2;-or  
    case VK_CONTROL:  *_ {l  
     MaskBits|=CTRLBIT; 5v !DYx  
     break; ]w_  
    case VK_SHIFT: Ukh$`q}  
     MaskBits|=SHIFTBIT; ER;lkF`RF  
     break; nqurY62Ip  
    default: //judge the key and send message \2].|Mym  
     break; N o_$!)J.  
   } ^z*):e  
   for(int index=0;index<MAX_KEY;index++){ 5!SoN}$  
    if(hCallWnd[index]==NULL) /Oq)3fU e  
     continue; co$Hi9JE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) z|G|Y 22  
    { jHu,u|e0>S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); E~<(i':  
     bProcessed=TRUE;  d-ag  
    } un$ Z7W/  
   } T1Gp$l  
  } GCP{Z]u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [xZ/ZWb/  
   for(int index=0;index<MAX_KEY;index++){ C-a*EG  
    if(hCallWnd[index]==NULL) aDN6MZM  
     continue; 2,8/Cb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) KJ0xp h f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (^DLCP#*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 WA]%,6  
   } :Wyn+  
  } P0'e"\$  
 } H})Dcg3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); nJtEUVMt  
} 7x[LF ^o  
( Lok  
  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: \A'|XdQ  
/-!&k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SE,o7_k'S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .0nn0)"  
OYszW]UMg  
  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: XD $%  
fV.A=*1l#  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^eT DD  
{ L;1$xI8tx  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) u%6Irdx  
 { Z/89&Uy`h  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lj " Z  
  SaveBmp(); >\|kJ?h  
  return FALSE; Cec9#C  
 } 5+e>+$2  
 …… //其它处理及默认处理  YBYBOH  
} *3A3>Rwu  
dWsT Jyx~  
~-XOvKJb  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 .-SDo"K.h  
&\;<t, 3A~  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 N5pinR5 H  
Xt</ -`  
  二、编程步骤 iGG6Myp-  
y-w2O]  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Ujce |>Wn  
L# `lQ"`K  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; kZV^F*7  
|?OdV<5C  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; fH{9]TU_:  
Zi 2o  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 1%$d D2  
&Q\_;  
  5、 添加代码,编译运行程序。 v-P8WFjca  
89LpklD  
三、程序代码 ]]el|  
E S#rs="  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $x?NNS_ "J  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?8 SK\{9r6  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ iBG`43;  
#if _MSC_VER > 1000 1 L+=|*:  
#pragma once A)\>#Dv  
#endif // _MSC_VER > 1000 ;;ER"N  
#ifndef __AFXWIN_H__ y bo#K  
#error include 'stdafx.h' before including this file for PCH YniZ( ~^K  
#endif |ZS 57c:  
#include "resource.h" // main symbols 7%{R#$F  
class CHookApp : public CWinApp ^y:FjQC:  
{ T?W[Z_D  
 public: nqZA|-}  
  CHookApp(); W3^zIj  
  // Overrides `d75@0:  
  // ClassWizard generated virtual function overrides PV?]UUc'n<  
  //{{AFX_VIRTUAL(CHookApp) m!rwG(  
 public: F0@Qgk]\  
  virtual BOOL InitInstance(); \n[ 392  
  virtual int ExitInstance(); ?k [%\jq{a  
  //}}AFX_VIRTUAL .CVUEK@Z4  
  //{{AFX_MSG(CHookApp) CD^CUbGk  
  // NOTE - the ClassWizard will add and remove member functions here. c]6V"Bo}A  
  // DO NOT EDIT what you see in these blocks of generated code ! %4j&H!y-w;  
  //}}AFX_MSG ;knd7SC   
  DECLARE_MESSAGE_MAP() |J:$MX~  
}; xKY$L*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); cvKV95bn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1s Br.+p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D+f'*|  
BOOL InitHotkey(); }0$mn)*k  
BOOL UnInit(); vT?Q^PTO  
#endif . 3Gn ZR,L  
Q(lku"U'  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BR;QY1  
#include "stdafx.h" %m oJF1  
#include "hook.h" Iph3%RaE  
#include <windowsx.h> tC2N >C[N  
#ifdef _DEBUG 8O;Vl  
#define new DEBUG_NEW 0eFb?Z0]  
#undef THIS_FILE GP* +  
static char THIS_FILE[] = __FILE__; 1 ojhh7<  
#endif Xad*I ulj  
#define MAX_KEY 100 Am=wEu[b  
#define CTRLBIT 0x04 [_h%F,_ A  
#define ALTBIT 0x02 gF3TwAr  
#define SHIFTBIT 0x01 lY.B  
#pragma data_seg("shareddata") B]1HS`*7  
HHOOK hHook =NULL; x"vwWJNQ  
UINT nHookCount =0; z+jh ;!i  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey tG/1pW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Mec{_jiH&D  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 8 4z6zFv?Q  
static int KeyCount =0; 2 #KoN8%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -&imjy<  
#pragma data_seg() F<5nGx cC  
HINSTANCE hins; " 9qp "%  
void VerifyWindow(); 9SY(EL  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp)  JX{KYU  
//{{AFX_MSG_MAP(CHookApp) .8]Y-  
// NOTE - the ClassWizard will add and remove mapping macros here. 6_*!|g  
// DO NOT EDIT what you see in these blocks of generated code! Sr&T[ex,.  
//}}AFX_MSG_MAP N=#4L$@-  
END_MESSAGE_MAP() Id %_{),HX  
jPnO@ H1  
CHookApp::CHookApp() z!:'V]  
{ y?>#t^  
 // TODO: add construction code here, 27>a#vCT  
 // Place all significant initialization in InitInstance va5FxF*%  
} =N_,l'U\^  
9RxO7K  
CHookApp theApp; "IG+V:{ou  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k^^:;OR  
{ +vz` go  
 BOOL bProcessed=FALSE; 2/@D7>F&g  
 if(HC_ACTION==nCode) >\Z R*CS  
 { k5@d! }#c  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8a9RML}G<  
   switch(wParam) =<{ RX8  
   { %w7m\nw@  
    case VK_MENU: ZW*n /#GUC  
     MaskBits&=~ALTBIT; JvkL37^ n:  
     break; ^n9a " qz  
    case VK_CONTROL: ,-@5NY1q  
     MaskBits&=~CTRLBIT; |z~LzSJv  
     break; &3Tx@XhO  
    case VK_SHIFT: x5OC;OQc  
     MaskBits&=~SHIFTBIT; 1kmQX+f  
     break; O% -h&C3  
    default: //judge the key and send message Ziz=]D_  
     break; y? "@v.  
   } '&by3y5w-3  
   for(int index=0;index<MAX_KEY;index++){ Y X*0?S  
    if(hCallWnd[index]==NULL) /BpxKh2p  
     continue; 1TjZ#yP%1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <*u C  
    { bD<qNqX$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); }E;F)=E  
     bProcessed=TRUE; S5_t1wqBJ  
    } wVqd$nsY"  
   } [9V]On  
  } F}U5d^!2  
  else if((lParam&0xc000ffff)==1){ //Key down Fc8E Y*  
   switch(wParam) JDv-O&]  
   { ?+r!z  
    case VK_MENU: $b>}C= gt  
     MaskBits|=ALTBIT; -#?<05/C>  
     break; qzK("d  
    case VK_CONTROL: xQu eE{  
     MaskBits|=CTRLBIT; /APcL5:=  
     break; wGJjA=C  
    case VK_SHIFT: knT.l"  
     MaskBits|=SHIFTBIT; 5j eO"jB  
     break; ]` ]g@v  
    default: //judge the key and send message =Ikg.jYq&F  
     break; kq-6HDR  
   } Km3&N  
   for(int index=0;index<MAX_KEY;index++) DA"}A`HfI  
   { @T&t.|`  
    if(hCallWnd[index]==NULL) gLQ #4H  
     continue; Ftv8@l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \iU]s\{).  
    { Y)XvlfJ,h?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >t3'_cBC!  
     bProcessed=TRUE; g:<?  
    } M=y0PCD  
   } }"zC >eX&  
  } }q!_!q,@  
  if(!bProcessed){ E=u/tpj  
   for(int index=0;index<MAX_KEY;index++){ &Y7C0v  
    if(hCallWnd[index]==NULL) ( 9$"#o  
     continue; - 8bNQU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }rbZ&IN\?E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e*]r  
   } jtKn3m7 +p  
  } :gI.l1  
 } a3@w|KLt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); lj2=._@R  
} tNnyue{p  
!e3YnlE  
BOOL InitHotkey() u+D[_yd^  
{ x*}bo))hb  
 if(hHook!=NULL){ }!)F9r@\  
  nHookCount++; 8]< f$3.  
  return TRUE; 0{) $SY  
 } 4v dNMV~  
 else 'iUg[{'+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); feEMg  
  if(hHook!=NULL) GXX+}=b7qO  
   nHookCount++; SwH2$:f  
  return (hHook!=NULL); &ZJgQ-Pc(m  
} ^# e~g/  
BOOL UnInit() Veji^-0E  
{ rt4Z;  
 if(nHookCount>1){ O~@fXMthh  
  nHookCount--; g4&jo_3:p  
  return TRUE; xh0xSqDM  
 } T_#, A0G  
 BOOL unhooked = UnhookWindowsHookEx(hHook); -<N&0F4|*  
 if(unhooked==TRUE){ K`k'}(vj  
  nHookCount=0; nWWM2v  
  hHook=NULL; 4MW ]EQ-  
 } uQeu4$k!  
 return unhooked; bAF )Bli  
} i0pU!`0  
o6}n8U}bk  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~}%~oT  
{ ?m;;D'1j  
 BOOL bAdded=FALSE; RuAlB*  
 for(int index=0;index<MAX_KEY;index++){ Kt/)pc  
  if(hCallWnd[index]==0){ AQ{zx1^2>K  
   hCallWnd[index]=hWnd; V#83!  
   HotKey[index]=cKey; SEF6B45}1  
   HotKeyMask[index]=cMask; \#dl6:"  
   bAdded=TRUE; Q M 1F?F  
   KeyCount++; F#V q#|_)>  
   break; p-$Cs _{Z  
  } \ijMw  
 } GAEO$e:  
 return bAdded; rZwB> c  
} TGV  
S~F`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7#-y-B]l  
{ :w-`PY J%G  
 BOOL bRemoved=FALSE; Jb(Y,LO^  
 for(int index=0;index<MAX_KEY;index++){ sR_xe}-  
  if(hCallWnd[index]==hWnd){ {'bip`U.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7*+TP~WI  
    hCallWnd[index]=NULL; j"7 JLe*  
    HotKey[index]=0; \4bWWy  
    HotKeyMask[index]=0; v[S-Pi1  
    bRemoved=TRUE; 'Ud| Ex@A9  
    KeyCount--; 3/goCg  
    break; >3D7tK(  
   } fCX*R"  
  } ;")A{tX2  
 } J7&DR^.Sw  
 return bRemoved; Fhj8lVvk  
} yA7 )Y})>  
5lmO:G1  
void VerifyWindow() HKmcQM  
{ uV]ULm#,i  
 for(int i=0;i<MAX_KEY;i++){ Utt>H@t[  
  if(hCallWnd!=NULL){ E{Vo'!LY  
   if(!IsWindow(hCallWnd)){ n9hm790x-  
    hCallWnd=NULL; KCR N}`^  
    HotKey=0; <$E6oZ  
    HotKeyMask=0; ]~c+'E`  
    KeyCount--; Ruaur]  
   } V1bh|+o9  
  } .v`b[4M4  
 } "mIgs9l$  
} B BL485`  
pGWA\}'  
BOOL CHookApp::InitInstance() N{joXHCu  
{ .;I29yk\XS  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;;&F1@3tBa  
 hins=AfxGetInstanceHandle(); y?z\L   
 InitHotkey(); \0*l,i1&  
 return CWinApp::InitInstance(); LAs7>hM  
} E5G{B'%j  
zg}YGu|J  
int CHookApp::ExitInstance() /iM$Tb5  
{ 79 Bg]~}Z  
 VerifyWindow(); ?y7w}W  
 UnInit(); 3<(q }  
 return CWinApp::ExitInstance(); >Hwc,j q  
} LtKB v 4  
6m`{Z`c$  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file &a)vdlZSE=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kU*{4G|6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0Xl%uF+w  
#if _MSC_VER > 1000 \cySWP[  
#pragma once 'fW#7W  
#endif // _MSC_VER > 1000 Ka-p& Uv1<  
`~F5 wh~  
class CCaptureDlg : public CDialog Plo,XU  
{ $aP(|!g  
 // Construction .YcN S%  
 public: vzR=>0#  
  BOOL bTray; PEXq:TA  
  BOOL bRegistered; %5B%KCCN  
  BOOL RegisterHotkey(); j4.&l3  
  UCHAR cKey; wD9a#AgEd  
  UCHAR cMask; =,/D/v$m'2  
  void DeleteIcon(); #$1$T  
  void AddIcon(); 4E3g,%9u  
  UINT nCount; ecHP &Z$  
  void SaveBmp(); Wk7WK` >i  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #G;X' BN  
  // Dialog Data q~Jq/E"f  
  //{{AFX_DATA(CCaptureDlg) SS3-+<z  
  enum { IDD = IDD_CAPTURE_DIALOG }; fC<m^%*zgA  
  CComboBox m_Key; z@h~Vb&I  
  BOOL m_bControl; O.+9,4A(  
  BOOL m_bAlt; $RO$}!  
  BOOL m_bShift; trYTs,KV  
  CString m_Path; z'MS#6|}  
  CString m_Number; ?b:_AO&  
  //}}AFX_DATA ?9KGnOVu  
  // ClassWizard generated virtual function overrides *e4TSqC|  
  //{{AFX_VIRTUAL(CCaptureDlg) r/r:oXK  
 public: S%6U~@hig  
  virtual BOOL PreTranslateMessage(MSG* pMsg); [_!O<z_sB  
 protected: E`D%PEps+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support b`~wG e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +!O- kd  
  //}}AFX_VIRTUAL p^QZq>v  
  // Implementation W |UtY`1  
 protected: D<):ZfUbI  
  HICON m_hIcon; fE;Q:# Z.  
  // Generated message map functions 8A2 z 5Aa  
  //{{AFX_MSG(CCaptureDlg) "> 90E^  
  virtual BOOL OnInitDialog(); t1i(;|8|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [xaisXvI4  
  afx_msg void OnPaint(); 2@i;_3sv  
  afx_msg HCURSOR OnQueryDragIcon(); cyF4iG'M,y  
  virtual void OnCancel(); 3Sh+u>w  
  afx_msg void OnAbout(); _<Dt z  
  afx_msg void OnBrowse(); (JZ".En#X  
  afx_msg void OnChange(); Zhi})d3l  
 //}}AFX_MSG U}AX0*S  
 DECLARE_MESSAGE_MAP() WH$HI/%*m  
}; 5cTY;@@  
#endif ^R_e  
@.9I3E-=  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `E>vG-9  
#include "stdafx.h" Ijo(^v@  
#include "Capture.h" Yp5L+~J[  
#include "CaptureDlg.h" =3'(A14C=  
#include <windowsx.h> kX;$}7n  
#pragma comment(lib,"hook.lib") ])T/sO#'  
#ifdef _DEBUG C1B'#F9EO  
#define new DEBUG_NEW T9jw X:n  
#undef THIS_FILE TQ'E5^  
static char THIS_FILE[] = __FILE__; AV4~U:vU  
#endif dHII.=lT  
#define IDM_SHELL WM_USER+1 n[" 9|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XAD3Z?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WZ~> BM  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; fI:H8  
class CAboutDlg : public CDialog b9("DZW;  
{ \ P/W8{  
 public: ; B$ *)X9  
  CAboutDlg(); L.)yXuo4  
  // Dialog Data >)c9|e=8  
  //{{AFX_DATA(CAboutDlg) km 5E)_]  
  enum { IDD = IDD_ABOUTBOX }; Ci\? ^  
  //}}AFX_DATA ~j& ?/{7I  
  // ClassWizard generated virtual function overrides Pes =aw  
  //{{AFX_VIRTUAL(CAboutDlg) 'mV:@].le  
 protected: q627<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e}"wL g]  
  //}}AFX_VIRTUAL tOg=zXm   
  // Implementation Gp|JU Fo  
 protected: q=0 pQ1>  
  //{{AFX_MSG(CAboutDlg) %z)EO9vtr  
  //}}AFX_MSG J$[Q?8 ka  
  DECLARE_MESSAGE_MAP() nQLs<]h1  
}; HeS'~Z$  
o)I/P<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d*-Xuv  
{ }76.6=~  
 //{{AFX_DATA_INIT(CAboutDlg) <GfVMD  
 //}}AFX_DATA_INIT a%J /0'(d  
} ?qT(3C9p  
- 9&g[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ]|LgVXEpx  
{ "c Pz|~  
 CDialog::DoDataExchange(pDX); QJXdb]Y^;  
 //{{AFX_DATA_MAP(CAboutDlg) 8/q*o>[?  
 //}}AFX_DATA_MAP O@,i1ha%  
} YFvgz.>QE  
r8v:|Q1"  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) UrK"u{G  
 //{{AFX_MSG_MAP(CAboutDlg) W_JhNe  
 // No message handlers z,+m[x=/N  
 //}}AFX_MSG_MAP r)B3es&&  
END_MESSAGE_MAP()  1N.tQ^  
l l:jsm  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ? ( 12aU  
: CDialog(CCaptureDlg::IDD, pParent) 5 ,ZRP'oI  
{ g :i*O^c @  
 //{{AFX_DATA_INIT(CCaptureDlg) t)(v4^T  
  m_bControl = FALSE; JQT4N[rEE  
  m_bAlt = FALSE; }x0Z( `  
  m_bShift = FALSE; sU%" azc  
  m_Path = _T("c:\\"); eH[y[~r  
  m_Number = _T("0 picture captured."); b]#~39Iph  
  nCount=0; `A{'s %$?!  
  bRegistered=FALSE; m+T2vi  
  bTray=FALSE; 4  
 //}}AFX_DATA_INIT z7q%,yw3N  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (xUFl@I!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); eT\p-4b  
} l?/gW D^  
jt%WPkY:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "1%*'B^}bw  
{ cYD1~JX.  
 CDialog::DoDataExchange(pDX); `~E<Sf<M  
 //{{AFX_DATA_MAP(CCaptureDlg) 5f3!NeI  
  DDX_Control(pDX, IDC_KEY, m_Key); *a4 b  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :SeLkQC  
  DDX_Check(pDX, IDC_ALT, m_bAlt); V8v,jS$l4  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); v>k b^38  
  DDX_Text(pDX, IDC_PATH, m_Path); 6`j<l5-h  
  DDX_Text(pDX, IDC_NUMBER, m_Number); V=9Bto00  
 //}}AFX_DATA_MAP }wL3mVz  
} !F,s"  
opnkmM&[  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) MM*-i=  
//{{AFX_MSG_MAP(CCaptureDlg) ,O9`X6rh'  
 ON_WM_SYSCOMMAND() u]#8 $M2  
 ON_WM_PAINT() O 3}P07  
 ON_WM_QUERYDRAGICON() 9/H^t* 5t  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) x`3. Wu\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R\ e#$"a5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 4ioN A/E  
//}}AFX_MSG_MAP T ~|PU{  
END_MESSAGE_MAP() 2dyxKK!\a  
_<Vg[ -:1  
BOOL CCaptureDlg::OnInitDialog() d-i&k(M  
{ |{!Ns+'  
 CDialog::OnInitDialog(); o HRbAE^  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);  qKx59  
 ASSERT(IDM_ABOUTBOX < 0xF000); )w@y(;WJ  
 CMenu* pSysMenu = GetSystemMenu(FALSE); pfNThMf  
 if (pSysMenu != NULL) %9.bu|`KK  
 { h%|9]5(=  
  CString strAboutMenu; 4Xr"d@2(  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  l58l  
  if (!strAboutMenu.IsEmpty()) [$H( CH`  
  { M'vXyb%$1  
   pSysMenu->AppendMenu(MF_SEPARATOR); LA>dkPB  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); A1 b6Zt  
  } X)Ocn`|  
 } ~Gwas0e Na  
 SetIcon(m_hIcon, TRUE); // Set big icon rcW#6VZ=  
 SetIcon(m_hIcon, FALSE); // Set small icon .Btv}b  
 m_Key.SetCurSel(0); BiI{8`M!$x  
 RegisterHotkey(); B~e7w 4  
 CMenu* pMenu=GetSystemMenu(FALSE); U(8I+xZ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _"`uqW79  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Q!Msy<v  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); R+x%r&L5F  
 return TRUE; // return TRUE unless you set the focus to a control '> 4+WZ1w5  
} +-",2 d+g  
:az!H"4W/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xQZ MCd  
{ <vO8_2,V-  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ^>t-v  
 { YU*46 hA1B  
  CAboutDlg dlgAbout; r)(i{:@r`  
  dlgAbout.DoModal(); X%*brl$D  
 }  S/)  
 else Ho:}Bn g  
 { }.w#X   
  CDialog::OnSysCommand(nID, lParam); >n#g9vK  
 } FC~|&  
} 18J.vcP  
JJ*0M(GG  
void CCaptureDlg::OnPaint() XC 57];-  
{ U8Cw7u2  
 if (IsIconic()) pC55Ec<  
 { +q 4W0  
  CPaintDC dc(this); // device context for painting U_.n=d~B  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); k_-vT  
  // Center icon in client rectangle 'aLPTVM^  
  int cxIcon = GetSystemMetrics(SM_CXICON); 01UqDdoj  
  int cyIcon = GetSystemMetrics(SM_CYICON); oR4fK td  
  CRect rect; iRkOH]+K  
  GetClientRect(&rect); 0<6rU  
  int x = (rect.Width() - cxIcon + 1) / 2; xu0;a  
  int y = (rect.Height() - cyIcon + 1) / 2; Y+}OClS  
  // Draw the icon !#l0@3  
  dc.DrawIcon(x, y, m_hIcon); XtnIK  
 } K7n;Zb:BR  
 else q^Q|.&_k /  
 { M ^ 0w/  
  CDialog::OnPaint(); Ma n^\gkCi  
 } b0rt.XB  
} =]2 b8  
l;.[W|  
HCURSOR CCaptureDlg::OnQueryDragIcon() G}Q}H*  
{ N}eU.#L  
 return (HCURSOR) m_hIcon; Y*h`),  
} ,dGFX]P  
pQ4 %]Api  
void CCaptureDlg::OnCancel() x)%% 5  
{ ghE?8&@ iq  
 if(bTray) ?tW%"S^D  
  DeleteIcon(); 6kgCS{MZ  
  CDialog::OnCancel(); ~ `tJvUo0  
} )1X' W  
xP<H,og&x=  
void CCaptureDlg::OnAbout() e2,<,~_K6  
{ \emT:Frb  
 CAboutDlg dlg; ;D %5 nnr  
 dlg.DoModal(); rPrEEWS0)  
} sPZV>Q:zY  
IIYX|;1}X  
void CCaptureDlg::OnBrowse() nvm1.}=Cnd  
{ ZlwcwoPib  
 CString str; vr8J*36{  
 BROWSEINFO bi; ,3g]= f  
 char name[MAX_PATH]; ]JhDRJ\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7%~VOB  
 bi.hwndOwner=GetSafeHwnd(); B h.6:9{  
 bi.pszDisplayName=name; WVBE>TB  
 bi.lpszTitle="Select folder"; 64IeCAMVo  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }V93~>  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); XPR:_  
 if(idl==NULL) 2J>A;x_?  
  return; * wQZ '  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); q/aL8V<"z  
 str.ReleaseBuffer(); h|$zHm  
 m_Path=str; & y 2GQJE  
 if(str.GetAt(str.GetLength()-1)!='\\') }lr fO_  
  m_Path+="\\"; s%0[DO3NV  
 UpdateData(FALSE); g,{Ei]$>I  
} ={wjeRp  
O(:u(U7e  
void CCaptureDlg::SaveBmp() tZ*f~yW  
{ &~D.")Dz  
 CDC dc; @et3}-c  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); -jklH/gF\%  
 CBitmap bm; z}Mb4{d1  
 int Width=GetSystemMetrics(SM_CXSCREEN); '/ ]fZ|  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4)c"@Zf  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0t/z "  
 CDC tdc; #o}{cXX#  
 tdc.CreateCompatibleDC(&dc); XO8 H]  
 CBitmap*pOld=tdc.SelectObject(&bm); "pKGUM  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); "' i [~  
 tdc.SelectObject(pOld); cZ7F1H~  
 BITMAP btm; b5iJ m-  
 bm.GetBitmap(&btm); SOi(5]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~ 33@H  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); t9=|* =;9)  
 BITMAPINFOHEADER bih; }I'>r(K  
 bih.biBitCount=btm.bmBitsPixel; =*U%j  
 bih.biClrImportant=0; mF$jC:Tb  
 bih.biClrUsed=0; d/-0B<ts  
 bih.biCompression=0; @)!1#^(}%  
 bih.biHeight=btm.bmHeight; #L)4 |  
 bih.biPlanes=1; 7\|NYT4  
 bih.biSize=sizeof(BITMAPINFOHEADER); GoZJDE3  
 bih.biSizeImage=size; JUUF^/J  
 bih.biWidth=btm.bmWidth; Qnu&GBM  
 bih.biXPelsPerMeter=0; c]:J/'vc  
 bih.biYPelsPerMeter=0; c^q O@%s  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); VN55!l'OV  
 static int filecount=0; rg]A_(3Bb  
 CString name; II f >z_m  
 name.Format("pict%04d.bmp",filecount++); ]#Z$jq{,  
 name=m_Path+name; Q& unA3  
 BITMAPFILEHEADER bfh; bvxxE/?Ni  
 bfh.bfReserved1=bfh.bfReserved2=0; _sD]Viqc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 3M>FU4Ug2  
 bfh.bfSize=54+size; 1.cUol nr  
 bfh.bfOffBits=54; lhvZ*[[<)  
 CFile bf; jP{]LJ2.6\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <:_]Yl  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); l{7Dv1[Ss  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u/c~PxC  
  bf.WriteHuge(lpData,size); y<gYf -E+  
  bf.Close(); c)P%O  
  nCount++; e"&9G}.f  
 } ]|\>O5eeu  
 GlobalFreePtr(lpData); ct4)faM  
 if(nCount==1) /%@RO^P  
  m_Number.Format("%d picture captured.",nCount); @ #O|  
 else dpOL1rrE  
  m_Number.Format("%d pictures captured.",nCount);  ~d<`L[  
  UpdateData(FALSE); iLQt9Hyk  
} HS7 G_  
r^ Rcjyc1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) =;-ju@d  
{ %RR|QY*  
 if(pMsg -> message == WM_KEYDOWN) oqU#I~ -  
 { -|iA!w#31  
  if(pMsg -> wParam == VK_ESCAPE) }5c'ui!3H  
   return TRUE; eVNBhR}HS  
  if(pMsg -> wParam == VK_RETURN) t1_y1!u Q  
   return TRUE; 7^ Q$pT>  
 } R~mMGz  
 return CDialog::PreTranslateMessage(pMsg); i?s&\3--Y  
} 07WIa@Q  
sNan"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sN \}Q#:8  
{ nQ(:7PFa'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ CIs1*:Q9  
  SaveBmp(); t2%bHIG}  
  return FALSE; Nv$gKC6 ,G  
} 0:(dl@I)@  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ a(t<eN>b!  
 CMenu pop; sOtNd({  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6W#F Ss~  
 CMenu*pMenu=pop.GetSubMenu(0); tFP;CW!E  
 pMenu->SetDefaultItem(ID_EXITICON); |$*9j""u  
 CPoint pt; 6"c!tJc7j  
 GetCursorPos(&pt); ,Z\,IRn  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); FYE9&{]h  
 if(id==ID_EXITICON) !z6/.>QJ~  
  DeleteIcon(); Jj _+YfIM  
 else if(id==ID_EXIT) p 7E{es|J  
  OnCancel(); n[p9$W`  
 return FALSE; [Kj#KJxy  
} F v^80M=z  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Sy7^;/(ZZ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |Btx&'m  
 AddIcon(); Q~8&pP8 I!  
 return res; `  vmk  
} O%h 97^%k  
w+TuS).  
void CCaptureDlg::AddIcon() FXwK9 %  
{ yA)+-  
 NOTIFYICONDATA data; {*P7)  
 data.cbSize=sizeof(NOTIFYICONDATA); 9(gOk  
 CString tip; MicVNs  
 tip.LoadString(IDS_ICONTIP); KKTfxNxJn  
 data.hIcon=GetIcon(0); WiCM,wDi  
 data.hWnd=GetSafeHwnd(); 4 Fc1 '  
 strcpy(data.szTip,tip); tf}Q%)`f  
 data.uCallbackMessage=IDM_SHELL; :zy'hu;  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; thboHPml{  
 data.uID=98; nf@u7*# 6  
 Shell_NotifyIcon(NIM_ADD,&data); z\ $>k_  
 ShowWindow(SW_HIDE); >Zp]vK~s  
 bTray=TRUE; xM"XNT6b  
} qk{UO <  
[#h!3d|?B  
void CCaptureDlg::DeleteIcon() oUS>p":  
{ +?g,&NE  
 NOTIFYICONDATA data; K`83C`w.  
 data.cbSize=sizeof(NOTIFYICONDATA); P\4o4MF@K  
 data.hWnd=GetSafeHwnd(); TVh7h`Eg  
 data.uID=98; :s985sEv  
 Shell_NotifyIcon(NIM_DELETE,&data); [ :(M<u`y>  
 ShowWindow(SW_SHOW); F[giq 1#  
 SetForegroundWindow(); D`@U[`Sw  
 ShowWindow(SW_SHOWNORMAL); g<5Pc,  
 bTray=FALSE; *bC^X'  
} }^bL'  
3 AF]en  
void CCaptureDlg::OnChange() |(8h:g  
{ bM_(`]&*  
 RegisterHotkey(); `CUO!'U  
} w)>z3L m  
?)<XuMh  
BOOL CCaptureDlg::RegisterHotkey() &l*dYzqq  
{ QnAf A%  
 UpdateData(); 5} aC'j\  
 UCHAR mask=0; H<Taf%JT  
 UCHAR key=0; Nm.>C4  
 if(m_bControl) H%gD[!^  
  mask|=4; P9chRy  
 if(m_bAlt) r:Tb{cA  
  mask|=2; oD2;Tdk  
 if(m_bShift) \ } Szb2  
  mask|=1; 0cU^ue%  
  key=Key_Table[m_Key.GetCurSel()]; _NW OSt  
 if(bRegistered){ cCCplL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); DLM9o3/*J  
  bRegistered=FALSE; 8-lY6M\R\  
 } 51'SA B09  
 cMask=mask; 'a[|}nJ3  
 cKey=key; c324@o^V  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); &Rt]K  
 return bRegistered; 6)YNjh.{ *  
} <plR<iI.  
&;3z 1s/  
  四、小结 NX",e=  
!\ukb  
  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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