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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: mZ2CG O R  
  {ZrlbDQX  
  一、实现方法 #Lpw8b6  
 [Q{\Ik  
  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: ?)J/uU2w  
dVYY:1PS  
#pragma data_seg("shareddata") ,@c1X:  
HHOOK hHook =NULL; //钩子句柄 *1Bq>h:  
UINT nHookCount =0; //挂接的程序数目 1Xo0(*O  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 z]r'8Jc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 v@|<.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey O-HS)g$2  
static int KeyCount =0; &BLCP d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }3A~ek#*~  
#pragma data_seg() \H bZ~I-  
U+qyS|i  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 bS;_xDXd  
McN[  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: g=[OH  
Cyd/HTNh<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR QK?V^E  
cKey,UCHAR cMask) s2"`j-iQ  
{ t 86w&  
 BOOL bAdded=FALSE; >vp4R`  
 for(int index=0;index<MAX_KEY;index++){ BK%. wi  
  if(hCallWnd[index]==0){ )M.s<Y  
   hCallWnd[index]=hWnd; x;)I%c  
   HotKey[index]=cKey; e,epKtL  
   HotKeyMask[index]=cMask;  u&#>)h  
   bAdded=TRUE; ']TWWwj$  
   KeyCount++; l>K+4  
   break; cN0 *<  
  } <wk  
 } 6`O,mpPu4G  
 return bAdded; ru@#s2  
} \894 Jqh  
//删除热键 #?Kw y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U!o7Nw@ z  
{ ;.Bz'Q  
 BOOL bRemoved=FALSE; 7H)$NG<U$  
 for(int index=0;index<MAX_KEY;index++){ ,eBC]4)B6  
  if(hCallWnd[index]==hWnd){ pe vXixl  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }ofb]_C,  
    hCallWnd[index]=NULL; Vt(Wy  
    HotKey[index]=0; g5@JA^\vZT  
    HotKeyMask[index]=0; TG}owG]]  
    bRemoved=TRUE; y62f{ks_/  
    KeyCount--; sJ|pR=g)!  
    break; n!4\w>h  
   } yf9"Rc~+  
  } ^T!Zz"/:  
 } h40;Q<D  
 return bRemoved; ##6\~!P  
} .p! DVQ"a  
P !i_?M  
;Y\LsmZ;F  
  DLL中的钩子函数如下: "G [Nb:,CR  
@w8} ]S  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w2.] 3QAZ  
{ .qSDe+A  
 BOOL bProcessed=FALSE; llP V{  
 if(HC_ACTION==nCode) _K9`o^g%PJ  
 { /IWA U)A0  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 YK6LJv}  
   switch(wParam) <4; nq~  
   {  J)YlG*  
    case VK_MENU: FL' }~il  
     MaskBits&=~ALTBIT; 9$\s v5  
     break; BDI@h%tJb:  
    case VK_CONTROL: KMwV;r  
     MaskBits&=~CTRLBIT; P)`^rJ6  
     break; D+3?p  
    case VK_SHIFT: xT"V9t[f  
     MaskBits&=~SHIFTBIT; U0_)J1Yp  
     break; D_d>A+  
    default: //judge the key and send message xRD+!3  
     break; (U.Go/A#wE  
   } ;|WUbc6&g  
   for(int index=0;index<MAX_KEY;index++){ Cq!eAc  
    if(hCallWnd[index]==NULL) FE\E%_K'n7  
     continue; kw$ 7G1Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4CF;>b f~  
    { Ncz4LKzt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =@Oo3*>  
     bProcessed=TRUE; \:4*h  
    } )k=KLQ\b  
   } :')[pO_FW*  
  } p-}X=O$  
  else if((lParam&0xc000ffff)==1){ //有键按下 oh8:1E,I  
   switch(wParam) wnokP  
   { Ei_ ~ K';  
    case VK_MENU: X%'z  
     MaskBits|=ALTBIT; "@&TC"YG0  
     break; f\hMTebma$  
    case VK_CONTROL: ]?4;Lw  
     MaskBits|=CTRLBIT; ie6 c/5  
     break; %*gf_GeM  
    case VK_SHIFT: &YXJ{<s  
     MaskBits|=SHIFTBIT; "tCTkog3]  
     break; `MVqd16Y  
    default: //judge the key and send message PT2;%=f  
     break; L(TM& ps\-  
   } T#Z&*  
   for(int index=0;index<MAX_KEY;index++){ @GN2v,WA?  
    if(hCallWnd[index]==NULL) 0$)Q@#  
     continue; PyQ .B*JJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S[F06.(1  
    { /Sj~lHh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +]%S}<R  
     bProcessed=TRUE; 8z1z<\  
    } j9NF|  
   } b)I-do+  
  } rRq60A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Cq2Wpu-u  
   for(int index=0;index<MAX_KEY;index++){ k4ti#3W5eG  
    if(hCallWnd[index]==NULL) ,s~l; Gkj  
     continue; 5?-HQoT)G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "ioO_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); wD9K\%jIr!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N_c44[z 1  
   } M1kA-Xr  
  } Q~ U\f$N  
 } j?2~6W/[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); UGPDwgq\v  
} Vu5?;|^:  
:oIBJ u%/  
  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: E@SFK=`  
=K`.$R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \1<'XVS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jo:Z  
W"Ip]LJ  
  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: >38>R0k35  
63W;N7@  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j*DPW)RkKX  
{ cT'Bp)a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) N1~bp?$1  
 { h0PDFMM<  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 *9j'@2!M  
  SaveBmp(); z)3TB&;  
  return FALSE; 1q7&WG  
 } 7S{qo&j'  
 …… //其它处理及默认处理 L"bJ#0m  
} fa/S!%}fO  
 \(\a=  
EwPrh  
  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。 q| D5 A|)  
aS [[ AL  
  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。 L )JB^cxf  
K{P-+(  
  二、编程步骤 ,clbD4  
LIID(s!bX  
  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";  ~71U s  
; JkSZs3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; yzS^8,  
=d{6=2Pt  
  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; 4zMvHe  
Ms!EK  
  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; ws0qwv#  
?6:qAFw  
  5、 添加代码,编译运行程序。 M|DMoi8x  
u} mj)Nk  
三、程序代码 Wu][A\3D1  
ZE=sw}=  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +_]Ui| l  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) (]#^q8)]\9  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ /I7V\  
#if _MSC_VER > 1000 ='m$ O  
#pragma once /z-rBfdy^  
#endif // _MSC_VER > 1000 k)b{ UFRW  
#ifndef __AFXWIN_H__ 7h 54j  
#error include 'stdafx.h' before including this file for PCH VIp|U{  
#endif 9mi@PW}1  
#include "resource.h" // main symbols ] U>MYdGWb  
class CHookApp : public CWinApp q}@L"a`  
{ hZ45i?%  
 public: N1'`^ay$  
  CHookApp(); egq,)6>  
  // Overrides w 0BphK[  
  // ClassWizard generated virtual function overrides %> XsKXj  
  //{{AFX_VIRTUAL(CHookApp) |*{*tW C1  
 public: O\=Z;}<N  
  virtual BOOL InitInstance(); =0cTct6\  
  virtual int ExitInstance(); OR@ 67Y  
  //}}AFX_VIRTUAL 9kD#'BxC  
  //{{AFX_MSG(CHookApp) agUdI_'~@9  
  // NOTE - the ClassWizard will add and remove member functions here. ^)dsi  
  // DO NOT EDIT what you see in these blocks of generated code ! >+%#m'Y&&  
  //}}AFX_MSG ~wa4kS<>  
  DECLARE_MESSAGE_MAP() 5eTA]  
}; 7:UeE~ uB:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); d7V/#34  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s 4`-mIa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -N' (2'  
BOOL InitHotkey(); jW:7PS  
BOOL UnInit(); ~}_^$l8#-Q  
#endif "^4*,41U  
#z(:n5$F  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %p}vX9U')  
#include "stdafx.h" puOtF YZ\  
#include "hook.h" rp@:i _]  
#include <windowsx.h> gNZwD6GMe?  
#ifdef _DEBUG 3WwS+6R  
#define new DEBUG_NEW >j?5?J"  
#undef THIS_FILE ;dzy 5o3  
static char THIS_FILE[] = __FILE__; ]ae(t`\l^  
#endif !`{?qQ[=  
#define MAX_KEY 100 XVs]Y'* x  
#define CTRLBIT 0x04 tb&?BCp  
#define ALTBIT 0x02 p cLKE ZK  
#define SHIFTBIT 0x01 31G:[;g  
#pragma data_seg("shareddata") \lK?f]qJq  
HHOOK hHook =NULL; L~ &S<5?  
UINT nHookCount =0; ,Q"'q0hM=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g}+|0FTV  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Mk*4J]PP  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey  %j&vV>2  
static int KeyCount =0; +-!3ruwSn  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift d*6f,z2=  
#pragma data_seg() ?AFb&  
HINSTANCE hins; }U7IMONU  
void VerifyWindow(); 8-G )lyfj  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Q6(~VvC-  
//{{AFX_MSG_MAP(CHookApp) =Z+^n ?"  
// NOTE - the ClassWizard will add and remove mapping macros here. 2O kID WcM  
// DO NOT EDIT what you see in these blocks of generated code! !~E/Rp  
//}}AFX_MSG_MAP &kb~N-  
END_MESSAGE_MAP() gvc@q`_]  
*B&P[n  
CHookApp::CHookApp() ':4ny]F  
{ 4u5j 7`O  
 // TODO: add construction code here, q[Ai^79  
 // Place all significant initialization in InitInstance aqSOC(jU  
} oRbWqN`F.  
g]f<k2  
CHookApp theApp; Szz j9K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;<i u*a  
{ |Y"XxM9  
 BOOL bProcessed=FALSE; Pim  
 if(HC_ACTION==nCode) j([b)k=  
 { 5]i#l3")  
  if((lParam&0xc0000000)==0xc0000000){// Key up IgbuMEfL  
   switch(wParam) 'fn}I0Vc  
   { [],[LkS  
    case VK_MENU: EeYL~ORdi  
     MaskBits&=~ALTBIT; CAc]SxLh  
     break; URVW5c  
    case VK_CONTROL: >)K3  
     MaskBits&=~CTRLBIT; !/}4_s`,  
     break; 6Jgl"Jw8  
    case VK_SHIFT: j"jssbu}  
     MaskBits&=~SHIFTBIT; 0Px Hf*  
     break; `O7vPE  
    default: //judge the key and send message ]{tWfv|Xg8  
     break; ]:f.="  
   } ^?e[$}  
   for(int index=0;index<MAX_KEY;index++){ >.SO2w  
    if(hCallWnd[index]==NULL) <);j5)/  
     continue; Uv59 XF$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M.H!dZ  
    { IEm?'o:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u/W{JPlL  
     bProcessed=TRUE; R V#w 0 r  
    } Z*Ffdh>*:&  
   } :+ YHj )mN  
  } TD\TVK3P  
  else if((lParam&0xc000ffff)==1){ //Key down -, +o*BP  
   switch(wParam) Yh]a4l0  
   { bAt!S  
    case VK_MENU: ta&z lZt  
     MaskBits|=ALTBIT; hEjvtfM9\-  
     break; "0!#De  
    case VK_CONTROL: 6ud?US(  
     MaskBits|=CTRLBIT; $idToOkw  
     break; ]Z[3 \~?  
    case VK_SHIFT: UL ew ~j  
     MaskBits|=SHIFTBIT; U$D:gZ  
     break; azmeJpC  
    default: //judge the key and send message ydD:6bBX  
     break; ]9 @4P$I  
   } B)/&xQu  
   for(int index=0;index<MAX_KEY;index++) EW]DzL 3  
   { >0kL9_9{  
    if(hCallWnd[index]==NULL) 0of:tZU  
     continue; G,A?yM'Vw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,pcyU\68v  
    { M]V j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @{V`g8P>  
     bProcessed=TRUE; {X, -T&  
    } Rq1 5AR  
   } |%4nU#GoB  
  } h(2{+Y+  
  if(!bProcessed){ Gad&3M0r  
   for(int index=0;index<MAX_KEY;index++){ n}NUe`E_h  
    if(hCallWnd[index]==NULL) tqA-X[^  
     continue; oItC;T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) f$ /C.E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); V,ZRX}O  
   } heF'7ezv#  
  } U-?r>K2  
 } LZ#A`&qUd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K{y`Sb~k  
} i_L u  
Iv7BIK^0  
BOOL InitHotkey()  V13^SVM  
{ ~i-n_7+  
 if(hHook!=NULL){ Q]/g=Nn ^~  
  nHookCount++; P,S!Z&!  
  return TRUE; "QfF]/:  
 } #5;4O{  
 else gd3MP^O1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 5UL5C:3R9  
  if(hHook!=NULL) `iuQ.I  
   nHookCount++; 3 } $9./+  
  return (hHook!=NULL); M|{KQ3q:9  
} =]Y'xzJuu  
BOOL UnInit() D{]w +  
{ D6_#r=08  
 if(nHookCount>1){ 5'Mw{`  
  nHookCount--; U&kdR+dB  
  return TRUE; Mn\L55?E(  
 } ke*&*mx"L  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Pw|/PfG  
 if(unhooked==TRUE){ #SLi v  
  nHookCount=0; `5t~ Vlp  
  hHook=NULL; 1%.CtTi  
 } ~O;?;@  
 return unhooked; %|}7YH41  
}  qzD  
K(mzt[n(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C/"Wh=h6  
{ 4>=Y@z  
 BOOL bAdded=FALSE; O6-"q+H)  
 for(int index=0;index<MAX_KEY;index++){ c1%ki%J#  
  if(hCallWnd[index]==0){ <Dnv=)Rq  
   hCallWnd[index]=hWnd; d#,   
   HotKey[index]=cKey; TGPdi5Eq  
   HotKeyMask[index]=cMask; iaJN~m\ M  
   bAdded=TRUE; ;f3))x  
   KeyCount++; z<"\I60Fe  
   break; U,/9fzgd  
  } ;hDIoSz  
 } $>~4RXC  
 return bAdded; mpCKF=KL.  
} mnMY)-6C  
#|xj*+)H  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) t;%MSedn  
{ AK;G_L  
 BOOL bRemoved=FALSE; Lp||C@h~  
 for(int index=0;index<MAX_KEY;index++){ [0NH#88ym<  
  if(hCallWnd[index]==hWnd){ <CP't[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5geZ6]|  
    hCallWnd[index]=NULL; q|;+Wp?  
    HotKey[index]=0; 5[qx5|O  
    HotKeyMask[index]=0; fwyz|>H_Y(  
    bRemoved=TRUE; j"+R*H(#  
    KeyCount--; n]JfdI  
    break; +>h'^/rAE  
   } =dC5q{  
  } ET]`  
 } nG5:H.)  
 return bRemoved; `WU"*HqW  
} 1lUY27MF  
"6'# L,  
void VerifyWindow() U}`HN*Q.q  
{ DOo34l6#  
 for(int i=0;i<MAX_KEY;i++){ F[|aDj@q e  
  if(hCallWnd!=NULL){ |w^nCsv  
   if(!IsWindow(hCallWnd)){ 0w l31k{  
    hCallWnd=NULL; v/Ei0}e6~  
    HotKey=0; !U+XIr  
    HotKeyMask=0; {,m W7  
    KeyCount--; l3/?,xn  
   } ZYW=#df R  
  } Oz,/y3_  
 } a_(vpD^  
} ;lb@o,R :  
;fDs9=3#  
BOOL CHookApp::InitInstance() U@?Ro enn  
{ D(S^g+rd  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); *$ 7c||J7  
 hins=AfxGetInstanceHandle(); B8G1 #V_jK  
 InitHotkey(); $5l=&  
 return CWinApp::InitInstance(); T%:W6fH7  
} <N;HB&mr  
B1gBvss  
int CHookApp::ExitInstance() RIl+QA  
{ Y_&)>;  
 VerifyWindow(); G&*2h2,]  
 UnInit(); )![? JXf  
 return CWinApp::ExitInstance(); ('p~h-9Vi  
} ,NaNih1  
 bR5+({yH  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D7x"P-ie  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) HTCn=MZm ?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >'lte&  
#if _MSC_VER > 1000 V`"A|Y  
#pragma once 3+jqf@fO  
#endif // _MSC_VER > 1000 9a9{OJa6M  
UYb:q  
class CCaptureDlg : public CDialog y| %rW  
{ h|1 /Q (  
 // Construction JuT~~Z  
 public: 7l3sd5  
  BOOL bTray; n P4DHb&5  
  BOOL bRegistered; HI30-$9  
  BOOL RegisterHotkey(); {)0"?$C_H  
  UCHAR cKey; 3"hPplE  
  UCHAR cMask; * 7 o(  
  void DeleteIcon(); t/aT  
  void AddIcon(); Bq]eNq  
  UINT nCount; x, ^j=n  
  void SaveBmp(); LY^pmak  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Hh8)d/D  
  // Dialog Data ~O}LAzGb  
  //{{AFX_DATA(CCaptureDlg) v [ 4J0  
  enum { IDD = IDD_CAPTURE_DIALOG }; @nS+!t{  
  CComboBox m_Key;  + >oA@z  
  BOOL m_bControl; 7,2bR  
  BOOL m_bAlt; 0xM\+R~,  
  BOOL m_bShift; J_A5,K*r|  
  CString m_Path; #}W^d^-5t5  
  CString m_Number; =X11x)]F9  
  //}}AFX_DATA Rs cU=oaKi  
  // ClassWizard generated virtual function overrides 0)'^vJe  
  //{{AFX_VIRTUAL(CCaptureDlg) <k&Q"X:"  
 public: }Z_w8+BZ  
  virtual BOOL PreTranslateMessage(MSG* pMsg); N?h=Zl|  
 protected: 1^zpO~@ S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Vn6g(:\w  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); b}9Ry"  
  //}}AFX_VIRTUAL gG^K\+S  
  // Implementation -Ug  
 protected: =:zmF]j9  
  HICON m_hIcon; vo[Zuv?<h  
  // Generated message map functions ^MGgFS]G  
  //{{AFX_MSG(CCaptureDlg) qqSf17sW  
  virtual BOOL OnInitDialog(); ~% QVjzMC  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); RAQi&?Ko  
  afx_msg void OnPaint(); iy{*w&p  
  afx_msg HCURSOR OnQueryDragIcon(); X99:/3MXB'  
  virtual void OnCancel(); .ns1;8  
  afx_msg void OnAbout(); [ENm(e$sI  
  afx_msg void OnBrowse(); &!#a^d+` 0  
  afx_msg void OnChange(); . j}dk.#h  
 //}}AFX_MSG pN"d~Z8  
 DECLARE_MESSAGE_MAP() DUxj^,mf,  
}; ]N^a/&} *  
#endif G:QaWqUb  
K_4}N%P/))  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 7 p(^I*|  
#include "stdafx.h" ^6 F-H(  
#include "Capture.h" | *Dklo9{  
#include "CaptureDlg.h" D0D0=s  
#include <windowsx.h> <8>gb!DG  
#pragma comment(lib,"hook.lib") MkG3TODfHB  
#ifdef _DEBUG X9#;quco@  
#define new DEBUG_NEW AAE8j.  
#undef THIS_FILE Tt.wY=,K  
static char THIS_FILE[] = __FILE__; ?A /+DRQ(  
#endif vl<W`)'  
#define IDM_SHELL WM_USER+1 i*'6"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); V_?5cwZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :;S]jNy}j)  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $UAmUQg)}_  
class CAboutDlg : public CDialog CxC&+';  
{ LoQm&3/  
 public: #N?EPV$  
  CAboutDlg(); xZ} 1dq8  
  // Dialog Data vl8Ums} +  
  //{{AFX_DATA(CAboutDlg) SNB >  
  enum { IDD = IDD_ABOUTBOX }; J)iy6{0"  
  //}}AFX_DATA WhsTKy&E  
  // ClassWizard generated virtual function overrides Rw\ LVRdA  
  //{{AFX_VIRTUAL(CAboutDlg) p `)(  
 protected: E-_FxBw  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mYf7?I~  
  //}}AFX_VIRTUAL wIIxs_2Q0c  
  // Implementation r<38; a  
 protected: 7yLO<o?9w  
  //{{AFX_MSG(CAboutDlg) w%&lCu@v  
  //}}AFX_MSG _Kg:jal  
  DECLARE_MESSAGE_MAP() mr]IxTv  
}; ({g7{tUy^H  
Gk0f#;  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) A>8uLO G}  
{ .olDmFQD  
 //{{AFX_DATA_INIT(CAboutDlg) TOp|Qtn  
 //}}AFX_DATA_INIT GtRc7,  
} r7r>1W%4  
U)%gzXTZ%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 2B{~"<  
{ tY^MP5*  
 CDialog::DoDataExchange(pDX); <J4|FOz!=  
 //{{AFX_DATA_MAP(CAboutDlg) L$^ya%2  
 //}}AFX_DATA_MAP ."<mL}Fi(  
} vkWh2z  
s)ymm7?  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7{ zkqug  
 //{{AFX_MSG_MAP(CAboutDlg) 5_@ u Be~  
 // No message handlers 2?h c94  
 //}}AFX_MSG_MAP mrR~[533j  
END_MESSAGE_MAP() p.kJNPO\@  
#E%0 o  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) LwQq0<v  
: CDialog(CCaptureDlg::IDD, pParent) r]p 0O(  
{ (a0q*iC%  
 //{{AFX_DATA_INIT(CCaptureDlg) 5T)qn`%  
  m_bControl = FALSE;  -z9-f\  
  m_bAlt = FALSE; 4hb<EH'_&  
  m_bShift = FALSE; X(nbfh?n  
  m_Path = _T("c:\\"); I;]Q}SUsm  
  m_Number = _T("0 picture captured."); S3rN]!B+  
  nCount=0; qi7(RL_N  
  bRegistered=FALSE; rnvKfTpZDU  
  bTray=FALSE; @0cQ4}  
 //}}AFX_DATA_INIT #%t&f"j2  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 c|8[$_2  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y%A!|aBu  
} 1Uzsw  
<<}t&qE%2%  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Fp52 |w_  
{ ]RgLTqv4x  
 CDialog::DoDataExchange(pDX); WV]%llj^  
 //{{AFX_DATA_MAP(CCaptureDlg) ]]~tFdh  
  DDX_Control(pDX, IDC_KEY, m_Key); 9Ml^\|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); E_-3G<rt  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >h+[#3vD  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); K]4XD1n7  
  DDX_Text(pDX, IDC_PATH, m_Path); +.gM"JV  
  DDX_Text(pDX, IDC_NUMBER, m_Number); RN(>37B3_  
 //}}AFX_DATA_MAP TxL;qZRY ^  
} CPssk,q~C  
}!=}g|z#|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) R0dIxG%  
//{{AFX_MSG_MAP(CCaptureDlg) q 65mR!)  
 ON_WM_SYSCOMMAND() "L'0"  
 ON_WM_PAINT() ,f ..46G  
 ON_WM_QUERYDRAGICON() /,v>w,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) wg<UCmfu!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) %$K2$dq5  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "L yMw){  
//}}AFX_MSG_MAP 34ij5bko_)  
END_MESSAGE_MAP() Ve,h]/G  
acd8?>%[  
BOOL CCaptureDlg::OnInitDialog() <T?H H$es)  
{ P%`|Tu!B  
 CDialog::OnInitDialog(); w E^6DNh  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); C{mL]ds<  
 ASSERT(IDM_ABOUTBOX < 0xF000); tHlKo0S$0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); s ~'><ioh  
 if (pSysMenu != NULL) H'N$Vv2q  
 { 6[g~p< 8n}  
  CString strAboutMenu; XRi/O)98o  
  strAboutMenu.LoadString(IDS_ABOUTBOX); X2>qx^jT  
  if (!strAboutMenu.IsEmpty()) ?;1^8 c0  
  { t?J Y@hT*  
   pSysMenu->AppendMenu(MF_SEPARATOR); bvZTB<rA  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); KLqn`m`O;  
  } )NG{iD{_]  
 } %Z|]"=;6  
 SetIcon(m_hIcon, TRUE); // Set big icon . C_\xb  
 SetIcon(m_hIcon, FALSE); // Set small icon  X$:r  
 m_Key.SetCurSel(0); WVaIC$Y  
 RegisterHotkey(); _jkH}o '  
 CMenu* pMenu=GetSystemMenu(FALSE); ~ KNdV  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 29P vPR6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); -:92<G\D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); H"hL+F^  
 return TRUE; // return TRUE unless you set the focus to a control .yp"6S^b  
} |BrD:+  
oNV5su  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =Kdd+g!  
{ Z]-C,8MM  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) pAwmQS\W  
 { C1 qyjlR  
  CAboutDlg dlgAbout; a&yIH;-  
  dlgAbout.DoModal(); XEd|<+P1  
 } %si5cc?  
 else +[l52p@a  
 { TE+d?  
  CDialog::OnSysCommand(nID, lParam); UO%Vu C5B  
 } 1eG@?~G  
} 4 qdLH^dX  
{4u8~whLp  
void CCaptureDlg::OnPaint() d0(GE4+/  
{ BPAz.K Q  
 if (IsIconic()) 4}nsW}jCc  
 { jn+NX)9  
  CPaintDC dc(this); // device context for painting /0|niiI  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E8]PV,#xY  
  // Center icon in client rectangle 2q2;Uo`"S.  
  int cxIcon = GetSystemMetrics(SM_CXICON); x!rHkuH~  
  int cyIcon = GetSystemMetrics(SM_CYICON); { bjK(|  
  CRect rect; C:C9swik"5  
  GetClientRect(&rect); @)0-oa,u+  
  int x = (rect.Width() - cxIcon + 1) / 2; q7id?F}3&  
  int y = (rect.Height() - cyIcon + 1) / 2; I{Pny/d`  
  // Draw the icon /rRQ*m_  
  dc.DrawIcon(x, y, m_hIcon); b}P5*}$:9"  
 } cp|&&q  
 else ![O@{/  
 { IEb"tsel  
  CDialog::OnPaint(); K*&?+_v :  
 } ]V9z)uz  
} gemjLuf  
RfPRCIo  
HCURSOR CCaptureDlg::OnQueryDragIcon() I"*;fdm  
{ }@Mx@ S  
 return (HCURSOR) m_hIcon; 0>D:  
} D8+68_BEM  
^Pc>/lY$Q%  
void CCaptureDlg::OnCancel() G$\2@RT9[  
{ BV=L.*  
 if(bTray) LM_/:  
  DeleteIcon(); |JVeW[C  
  CDialog::OnCancel(); %,9iY&;U"  
} *|c*/7]<  
mPR(4Ol.  
void CCaptureDlg::OnAbout() t >89( k  
{ 1c=Roiq  
 CAboutDlg dlg; 7h?yAgDv~  
 dlg.DoModal(); .F'fBT` $  
} (n{sp  
-e_+x'uF  
void CCaptureDlg::OnBrowse() 5[WhjTo  
{ {Kp<T  
 CString str; PPCZT3c=  
 BROWSEINFO bi; Uk5O9D0 He  
 char name[MAX_PATH]; G>hmVd  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %]9 <a  
 bi.hwndOwner=GetSafeHwnd(); %9|=\# G  
 bi.pszDisplayName=name; A@/DGrZX  
 bi.lpszTitle="Select folder"; G@Dw  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0 `X%&  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1\d$2N"  
 if(idl==NULL) \FOX#|i)  
  return; W'{q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g%w@v$  
 str.ReleaseBuffer(); [kqxC  
 m_Path=str; S fE^'G\  
 if(str.GetAt(str.GetLength()-1)!='\\') W-Cf#o  
  m_Path+="\\"; EXz5Rue LV  
 UpdateData(FALSE); I>b-w;cC  
} qL^}t_>  
W%]sI n  
void CCaptureDlg::SaveBmp() 6p/gvpZ  
{ 7lpd$Y  
 CDC dc; aE^tc'h~  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?v2OoNQ   
 CBitmap bm; g j`"|  
 int Width=GetSystemMetrics(SM_CXSCREEN); dG{`Jk  
 int Height=GetSystemMetrics(SM_CYSCREEN); pk'@!|g%=  
 bm.CreateCompatibleBitmap(&dc,Width,Height); w $7J)ngA9  
 CDC tdc; ?U0iHg{  
 tdc.CreateCompatibleDC(&dc); x q93>Hs  
 CBitmap*pOld=tdc.SelectObject(&bm); t" 1'B!4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 1Oo^  
 tdc.SelectObject(pOld); u!2.[CV  
 BITMAP btm; lv}U-vK  
 bm.GetBitmap(&btm); "r0z( j  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1QRE-ndc  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); P9J3Ii!  
 BITMAPINFOHEADER bih; RM53B  
 bih.biBitCount=btm.bmBitsPixel; 78tWzO  
 bih.biClrImportant=0; `4s5yNUi=  
 bih.biClrUsed=0; MBCA%3z08  
 bih.biCompression=0; mQ#@"9l%  
 bih.biHeight=btm.bmHeight; =K2Dxu_:  
 bih.biPlanes=1; uPe4Rr  
 bih.biSize=sizeof(BITMAPINFOHEADER); lh* m(  
 bih.biSizeImage=size; GK}?*Lf s  
 bih.biWidth=btm.bmWidth; \S;% "0!  
 bih.biXPelsPerMeter=0; wxZnuCO%H8  
 bih.biYPelsPerMeter=0; fiTMS:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1Qf21oN{  
 static int filecount=0; bxP>  
 CString name; q{f%U.  
 name.Format("pict%04d.bmp",filecount++); bIizh8d?  
 name=m_Path+name; > 3 JU  
 BITMAPFILEHEADER bfh; *Kt7"J  
 bfh.bfReserved1=bfh.bfReserved2=0; uqZLlP#&#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %dZD;Vhg  
 bfh.bfSize=54+size; xtjTU;T  
 bfh.bfOffBits=54; 9Q :IgY?T  
 CFile bf; o]#Q6J  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !mL,Ue3/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h`%K \C  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 14\%2nE  
  bf.WriteHuge(lpData,size); .]ZM2  
  bf.Close(); i`r,B`V`08  
  nCount++; f7X#cs)a  
 } &tZ?%sr  
 GlobalFreePtr(lpData); 6f=/vRAh$  
 if(nCount==1) p'k stiB  
  m_Number.Format("%d picture captured.",nCount); @Risab n  
 else ,@!8jar@w}  
  m_Number.Format("%d pictures captured.",nCount);  wB5zp  
  UpdateData(FALSE); 7V0:^Jov  
} MV$>|^'em  
#`a-b<uz  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) UVu"meZX  
{ #`GW7(M  
 if(pMsg -> message == WM_KEYDOWN) G"MpA[a_  
 { zx(j6  
  if(pMsg -> wParam == VK_ESCAPE) Kggf!\MR8  
   return TRUE; 1:7>Em<s  
  if(pMsg -> wParam == VK_RETURN) D4'? V Iz  
   return TRUE; v\-"NHl  
 } sNvT0  
 return CDialog::PreTranslateMessage(pMsg); $?Aez/  
} w0SzK-&  
7OtQK`P"A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `P/*x[?  
{ U`6QD}c"s  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ i*_KHK  
  SaveBmp(); f'FY<ed<w  
  return FALSE; W~k!qy `  
} [&nwB!kt  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ U]R?O5K  
 CMenu pop; CX':nai  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); + y.IDn^  
 CMenu*pMenu=pop.GetSubMenu(0); ,_rarU)[J  
 pMenu->SetDefaultItem(ID_EXITICON); =La}^  
 CPoint pt; 9b]U&A$  
 GetCursorPos(&pt); eiEZtu  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); F:pXdU-xf  
 if(id==ID_EXITICON) v/+dx/  
  DeleteIcon(); T|.Q81.NE  
 else if(id==ID_EXIT) !u6~#.7  
  OnCancel(); ?RpT_u  
 return FALSE; ]Jnf. 3  
} YGWb!|Z$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +1d\ZZA|6&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V"$t>pAG  
 AddIcon(); Sa,N1r  
 return res; C2<y(GU[Bh  
} NYP3uGH]  
-&)^|Atm  
void CCaptureDlg::AddIcon() ,;+\!'lS  
{ 7Wb.(` a<  
 NOTIFYICONDATA data; A^,(Vyd  
 data.cbSize=sizeof(NOTIFYICONDATA); {+xUAmd  
 CString tip; u~s'<c+8_  
 tip.LoadString(IDS_ICONTIP); dt`L}Yi  
 data.hIcon=GetIcon(0); =AD/5E,3  
 data.hWnd=GetSafeHwnd(); %4 SREq  
 strcpy(data.szTip,tip); 3]N}k|lb%  
 data.uCallbackMessage=IDM_SHELL; M8[YW|VkP  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tB_V%qH  
 data.uID=98; hsqUiB tc6  
 Shell_NotifyIcon(NIM_ADD,&data); W$'pUhq\H  
 ShowWindow(SW_HIDE); C9=f=sGL  
 bTray=TRUE; J$e.$ah;  
} K,IOD t  
N7oMtlvL[w  
void CCaptureDlg::DeleteIcon() !5B9:p~-  
{ G4x.''r&Sl  
 NOTIFYICONDATA data; Z;>~<#!4  
 data.cbSize=sizeof(NOTIFYICONDATA); J`RNik*>  
 data.hWnd=GetSafeHwnd(); IN%>46e`  
 data.uID=98; }2NH>qvY  
 Shell_NotifyIcon(NIM_DELETE,&data); =fsaJ@q ,R  
 ShowWindow(SW_SHOW); I.8|kscM  
 SetForegroundWindow(); *<Ddn&_  
 ShowWindow(SW_SHOWNORMAL); oVq@M  
 bTray=FALSE; \B}W(^\wg;  
} c<D Yk f  
Ra{B8)Q  
void CCaptureDlg::OnChange() k oHY AF  
{ @\"*Z&]8z0  
 RegisterHotkey(); chd${ j  
} }MIH{CMH  
6\TstY3  
BOOL CCaptureDlg::RegisterHotkey() :.35pp,0  
{ ("lcL2Bq  
 UpdateData(); Vbj?:29A  
 UCHAR mask=0; PzV(e)~7  
 UCHAR key=0; ?ft_  
 if(m_bControl) Bw_Ih|y,w  
  mask|=4; &)X<yd0  
 if(m_bAlt) <rC#1wR4  
  mask|=2; wP8R=T  
 if(m_bShift) < `r+l5  
  mask|=1; KPR{5  
  key=Key_Table[m_Key.GetCurSel()]; *z+\yfOO"  
 if(bRegistered){ D{loX6  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f%|S>(   
  bRegistered=FALSE; }oN(nPxv9  
 } T^nX+;:|  
 cMask=mask; +%<Jr<~W  
 cKey=key; ;9I#>u  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); v PGuEfz  
 return bRegistered; K[kmfXKu  
} GDcV1$NA  
)_Oc=/c|f  
  四、小结 D/:)rj14b  
}cPV_^{  
  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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