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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: "0Wi-52=V  
  ~$GRgOn  
  一、实现方法 Aj854 L(!  
[z2XK4\e1T  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: h%9>js^~  
cjf 8N:4N0  
#pragma data_seg("shareddata") wx a?.  
HHOOK hHook =NULL; //钩子句柄 MM}lW-q;  
UINT nHookCount =0; //挂接的程序数目 Vq'\`$_  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 $2p=vi 3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Wchu-]  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey F;4*,Ap  
static int KeyCount =0; O_zW/#  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 rd*`8B  
#pragma data_seg() |[/<[@\''  
YP^=b}  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 7# ~v<M6  
BGtr=&Hq  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: uwQ~4   
)\ `AD#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR MI: rH  
cKey,UCHAR cMask) g*]hmkYe9  
{ n~1F[ *  
 BOOL bAdded=FALSE; W'|NYw_B  
 for(int index=0;index<MAX_KEY;index++){ scf.> K2  
  if(hCallWnd[index]==0){ eb6Ux  
   hCallWnd[index]=hWnd; )\S3Q  
   HotKey[index]=cKey; I~^t\iujs  
   HotKeyMask[index]=cMask; mH1T|UI  
   bAdded=TRUE; ?Uq;>  
   KeyCount++; {7k Jj(Ue  
   break; XniPNU  
  } 'n:|D7t  
 } k? <.yr1  
 return bAdded; S!Alno  
} / [s TN.MG  
//删除热键 1^f7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jmp0 %:+L  
{ |r U?  
 BOOL bRemoved=FALSE; J?wCqA  
 for(int index=0;index<MAX_KEY;index++){ D*%?0  
  if(hCallWnd[index]==hWnd){ ,Y:ET1:  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ syJLcK+e  
    hCallWnd[index]=NULL; - w{`/  
    HotKey[index]=0; R ]h3a :ic  
    HotKeyMask[index]=0; i/C`]1R/  
    bRemoved=TRUE; a2!U9->!  
    KeyCount--; :*=fGwIWS  
    break; H;h$k]T  
   } lZ'WFFWLE  
  } "t.Jv%0=  
 } tx*L8'jlN  
 return bRemoved; >1}@Q(n/}{  
} YE*%Y["  
9\zasa  
K7 J RCLA  
  DLL中的钩子函数如下: tD~ n PbbB  
22T\ -g{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;p(I0X  
{ 2zV{I*  
 BOOL bProcessed=FALSE; 33=lR-N#  
 if(HC_ACTION==nCode) [n2+`A  
 { S4_C8  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 %lnVzGP  
   switch(wParam) :R{pV7<O  
   {  )ZW[$:wA  
    case VK_MENU: A_\`Gj!s%  
     MaskBits&=~ALTBIT; yPd6{% w  
     break; Op'&c0l  
    case VK_CONTROL: T4nWK!}z  
     MaskBits&=~CTRLBIT; \8Hs[H!  
     break; 0clq}  
    case VK_SHIFT: : 5X^t  
     MaskBits&=~SHIFTBIT; q'Nafa&a)  
     break; z:ZXdB)L)  
    default: //judge the key and send message Kqz+:E8D  
     break; yW)r`xpY  
   } 9Tg k=  
   for(int index=0;index<MAX_KEY;index++){ Y3 \EX  
    if(hCallWnd[index]==NULL) 3xz|d`A  
     continue; AxfQ{>)0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Xw#"?B(M]  
    { G=F_{z\}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); r;9 V7C  
     bProcessed=TRUE; | .gE9'"bv  
    } i-}T t<^  
   } jL7r1pu5  
  } }BUm}.-{u,  
  else if((lParam&0xc000ffff)==1){ //有键按下 MtVvi6T  
   switch(wParam) O I0N(V  
   { ~: fSD0  
    case VK_MENU: D<`M<:nq  
     MaskBits|=ALTBIT; #N$\d4q9  
     break; gN2oUbf8  
    case VK_CONTROL: b BiTAP  
     MaskBits|=CTRLBIT; va:<W H  
     break; +c8t~2tuN  
    case VK_SHIFT: I)kc[/^j$  
     MaskBits|=SHIFTBIT;  "D'rsEh  
     break; 1% C EUE  
    default: //judge the key and send message ~Zn|(  
     break; >,QCKZH  
   } 3B='f"G  
   for(int index=0;index<MAX_KEY;index++){ E4'z  
    if(hCallWnd[index]==NULL) C+t0Zen  
     continue; Zd'Yu{<_2N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5UJ ?1"J  
    { V!(7=ku!`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  LJ;&02w@  
     bProcessed=TRUE; nLOK1@,4  
    } 052Cf dq  
   } PJ4/E  
  } ~;z] _`_Va  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 NJSbS<O  
   for(int index=0;index<MAX_KEY;index++){  "UreV  
    if(hCallWnd[index]==NULL) ;B;@MD,B  
     continue; +V(^ "Z~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) sv&^sARN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =1k%T{>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 #jzF6j%G  
   } JS/ChoU  
  } jo0XF]  
 } t%G.i@{pkp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %t$KVV  
} $f _C~O  
{8qcM8  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: xAl8e  
YXZP-=fB>i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zy%0;%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5|~nX8>  
d"IZt;s/,  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ll1N`ke  
n.qT7d(  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \NMqlxp2  
{ :4-,Ru1C"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) t#@z_Mn\  
 { @C!&lrf3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `)5WA{z  
  SaveBmp(); X(eW+,H  
  return FALSE; c-5AI{%bl6  
 } /V{UTMSz  
 …… //其它处理及默认处理 ,}]v7DD  
} Sgv_YoD?-  
(_!I2"Q*  
cD6^7QF  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 c_S~{a44Ud  
|U;O HS  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 zCQP9oK!  
j5Da53c#^  
  二、编程步骤 |&{S ~^$  
^\Z+Xq1~/  
  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"; h@NC#Iod  
,mHUo4h1O  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; #+p-  
A.("jb@I  
  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; U;WwEta ]  
w&p(/y  
  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; Ky"F L   
>V?0#f45@  
  5、 添加代码,编译运行程序。 5 ,-8oEUL  
]vB\yQE  
三、程序代码 /{`"X_.o  
z`t~N  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wEM=Tr/h  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) .l_Nf9=  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ )dX(0E4Td/  
#if _MSC_VER > 1000 B7[d^Y60B  
#pragma once c'tQA  
#endif // _MSC_VER > 1000 z2t+1 In,  
#ifndef __AFXWIN_H__ "r_wgl%  
#error include 'stdafx.h' before including this file for PCH m N}szW,  
#endif ?R#$ c]  
#include "resource.h" // main symbols r!dWI  
class CHookApp : public CWinApp yD7}  
{ y)&K9 I  
 public: ur8+k4] \"  
  CHookApp(); M Zz21H  
  // Overrides FMeBsI9pL  
  // ClassWizard generated virtual function overrides QHZ",1F  
  //{{AFX_VIRTUAL(CHookApp) U< G2tn(  
 public: Y2QX<  
  virtual BOOL InitInstance(); [Cv./hEQi  
  virtual int ExitInstance(); clV^Xg8D  
  //}}AFX_VIRTUAL O7VEyQqf5  
  //{{AFX_MSG(CHookApp) $U]T8;5Q  
  // NOTE - the ClassWizard will add and remove member functions here. KH;~VR8"/  
  // DO NOT EDIT what you see in these blocks of generated code ! =oSd M2  
  //}}AFX_MSG t kj  
  DECLARE_MESSAGE_MAP() 0GrM:Lh y  
};  &Q~W{.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); y0mNDze  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \(P?=] -  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hk4t #Km  
BOOL InitHotkey(); U[f00m5{HV  
BOOL UnInit(); WV$CZgL  
#endif rMxIujx  
K#wA ;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. D1xGUz2r  
#include "stdafx.h" YP_L~zZ  
#include "hook.h" 4G(7V:  
#include <windowsx.h> X n!mdR  
#ifdef _DEBUG 50N4J  
#define new DEBUG_NEW ;z4F-SYQ  
#undef THIS_FILE ]q%r2 (y,k  
static char THIS_FILE[] = __FILE__; {s0%XG1$  
#endif Y)X7*iTi'j  
#define MAX_KEY 100 dz9U.:C  
#define CTRLBIT 0x04 JyMk @Y  
#define ALTBIT 0x02 Xh;.T=/E|  
#define SHIFTBIT 0x01 B]"`}jn  
#pragma data_seg("shareddata") o2ggHZe/=@  
HHOOK hHook =NULL; ,-y9P  
UINT nHookCount =0; MMFwT(l<1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T(7`$<TQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Kk8} m;  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey mgjJNzclL  
static int KeyCount =0; ,D+ydr  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift #4'wF4DR@  
#pragma data_seg() vAUt~ X"  
HINSTANCE hins; a'i Q("  
void VerifyWindow();  lln"c  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 46A sD  
//{{AFX_MSG_MAP(CHookApp) :jl*Y-mM  
// NOTE - the ClassWizard will add and remove mapping macros here. elCYH9W^  
// DO NOT EDIT what you see in these blocks of generated code! NZq-%bE  
//}}AFX_MSG_MAP !,[#,oy;  
END_MESSAGE_MAP() ^}=)jLS  
K.)!qkW-%S  
CHookApp::CHookApp() dM-cQo:  
{ .*zS2 z  
 // TODO: add construction code here, c1'@_Is  
 // Place all significant initialization in InitInstance o{s2T)2  
} YJ _eE  
jfxNV2[  
CHookApp theApp; cJ96{+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G68KoM  
{ Y_'ERqQ  
 BOOL bProcessed=FALSE; *DF3juf~  
 if(HC_ACTION==nCode) b&z#ZY  
 { \3 SY2g8+  
  if((lParam&0xc0000000)==0xc0000000){// Key up ;l@94)@0  
   switch(wParam) ]nTeTW  
   { d/7fJ8y8  
    case VK_MENU: t}q e_c  
     MaskBits&=~ALTBIT; \]tBwa  
     break; 1X?ro;  
    case VK_CONTROL: } e[ E  
     MaskBits&=~CTRLBIT; &uNec( c  
     break; 7*5B  
    case VK_SHIFT: o^"+X7)  
     MaskBits&=~SHIFTBIT; 6 R6Ub 0  
     break; w+br)  
    default: //judge the key and send message 5p0~AN)  
     break; fq7#rZCxX  
   } B5lwQp]  
   for(int index=0;index<MAX_KEY;index++){ yE$PLM  
    if(hCallWnd[index]==NULL) OdzeHpH3g  
     continue; sfM"!{7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }%< ?]  
    { G]K1X"W?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hg)Xr5>  
     bProcessed=TRUE; F5o8@ Ib]:  
    } sf> E  
   } s6`E.Eevm  
  } 7H6Ts8^S  
  else if((lParam&0xc000ffff)==1){ //Key down ewMVUq*:  
   switch(wParam) ;2f=d_/x  
   { ]>n{~4a  
    case VK_MENU: BhJ>G%  
     MaskBits|=ALTBIT; h,{m{Xh  
     break; 1W USp;JMl  
    case VK_CONTROL: 5GsmBf$RUb  
     MaskBits|=CTRLBIT; V%,,GmiU]  
     break; PUdv1__C  
    case VK_SHIFT: RNT9M:w  
     MaskBits|=SHIFTBIT; PucNu8   
     break; V}E['fzBFV  
    default: //judge the key and send message a"#t'\  
     break; $S6(V}yh  
   } S:xXD^n#H  
   for(int index=0;index<MAX_KEY;index++) 0Wr<l%M)+  
   { y,D9O/VP  
    if(hCallWnd[index]==NULL) k[Em~>m  
     continue; =E-x0sr?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #7uH>\r  
    { (XZ[-M7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); VfnL-bDGV  
     bProcessed=TRUE; uo:RNokjJ  
    } l)u%`Hcn  
   } ]cRvdUGv  
  } E>fY,*0  
  if(!bProcessed){ Ac_P^  
   for(int index=0;index<MAX_KEY;index++){ gwj?.7N*k  
    if(hCallWnd[index]==NULL) N.|F8b]v  
     continue; _}{KS, f]0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *DJsY/9d}'  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '(]Wtx%9"  
   } 0|GYtnd  
  } Q2fxsa[  
 } S>lP?2J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @nH3nn  
} X@~/.H5  
m(f`=+lqI`  
BOOL InitHotkey() zw<<st Bp  
{ 4M C]s~n  
 if(hHook!=NULL){ c)EYX o  
  nHookCount++; ?q!4REM  
  return TRUE; m[%356u  
 } MWwqon|  
 else D0J{pAJ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); w,1N ;R&  
  if(hHook!=NULL) =Uk #7U"P  
   nHookCount++;  (?Ku-k  
  return (hHook!=NULL); Lg\3DzM  
} J.iz%8  
BOOL UnInit() L=(-BYS  
{ BA a:!p  
 if(nHookCount>1){ {aE[h[=r  
  nHookCount--; 4K cEJlK5  
  return TRUE; C:1(<1K  
 } ?>7\L'n=5I  
 BOOL unhooked = UnhookWindowsHookEx(hHook); dV$[O`F* b  
 if(unhooked==TRUE){ DY`0 `T  
  nHookCount=0; 60{G 4b)  
  hHook=NULL; \O*ZW7?TJ  
 } CH7a4qL`  
 return unhooked; Rk9n,"xpv  
} - ~z@W3\  
t__f=QB/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Y6wr}U  
{ ij:xr% FJ  
 BOOL bAdded=FALSE; WvU[9ME^)  
 for(int index=0;index<MAX_KEY;index++){ U<Oc&S{]*  
  if(hCallWnd[index]==0){ Lginps[la  
   hCallWnd[index]=hWnd; Ry[7PLn]  
   HotKey[index]=cKey; MTt8O+J?P~  
   HotKeyMask[index]=cMask; U*nB= =  
   bAdded=TRUE; <xBL/e %  
   KeyCount++;  +At [[  
   break; km>ZhsqD  
  } Z +/3rd  
 } $`OyGeq"T  
 return bAdded; o2|#_tGNUy  
} 9ad`q+kY  
6O?zi|J[:  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p#c41_?'e  
{ t<Sa ;[+  
 BOOL bRemoved=FALSE; -s HX   
 for(int index=0;index<MAX_KEY;index++){ t tr`  
  if(hCallWnd[index]==hWnd){ 8Z}%,G*n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *v#V%_o  
    hCallWnd[index]=NULL; T T 3 6Y  
    HotKey[index]=0; <uU<qO;6  
    HotKeyMask[index]=0; O<fy^[r:`  
    bRemoved=TRUE; L0VZ>!*o  
    KeyCount--; HH6n3c!:mm  
    break; .3) 27Cjw  
   } b1^wK"#  
  } +Zi+ /9Z(H  
 } %i7U+v(d  
 return bRemoved; o w(9dB&E  
} ftmP dha%+  
}r18Y6  
void VerifyWindow() {$t*XTY6R  
{ Q~.t8g/  
 for(int i=0;i<MAX_KEY;i++){ 7Z9'Y?[m  
  if(hCallWnd!=NULL){ 7oZPb  
   if(!IsWindow(hCallWnd)){ X<_HQ  
    hCallWnd=NULL; L~/L<Ms  
    HotKey=0; Xz:ha >}C  
    HotKeyMask=0; l4mRNYv)z  
    KeyCount--; 6wT ])84  
   } S~r75] "  
  } m*1  
 } y k!K 5  
} ,^n&Q'p3  
bGB$a0  
BOOL CHookApp::InitInstance() NsS;d^%I  
{ ^?]-Q*w3Qs  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Z[&FIG% tV  
 hins=AfxGetInstanceHandle(); `uLr^G=;  
 InitHotkey(); LV1drc  
 return CWinApp::InitInstance(); W=g'Xu!|!2  
} 3S#p4{3   
}UcdkKq  
int CHookApp::ExitInstance() *[i49X&rd  
{ L1+s0g>  
 VerifyWindow(); [So1`IA6  
 UnInit(); I%:?f{\  
 return CWinApp::ExitInstance(); 7MZH'nO  
} t@R n#(~"  
z.(DDj  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `, ]ui*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ab9ecZ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ f tl$P[T  
#if _MSC_VER > 1000 gREk,4DAv  
#pragma once }^Sk.:;n3  
#endif // _MSC_VER > 1000 cGm?F,/`  
aeNbZpFQ  
class CCaptureDlg : public CDialog AB3OG*C9  
{ 4P5^.\.  
 // Construction 8JQ\eF$ma  
 public: UpD4'!<buV  
  BOOL bTray; kf<c[su  
  BOOL bRegistered; [\eVX`it  
  BOOL RegisterHotkey(); yFeFI@Hp 3  
  UCHAR cKey; u^MRKLn  
  UCHAR cMask; IIT[^_g  
  void DeleteIcon(); WC=d @d)M  
  void AddIcon(); \}4*}Lr  
  UINT nCount; n8)&1 q?V  
  void SaveBmp(); S,5>/'fy0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor >l%8d'=Jl  
  // Dialog Data Y+),c14#  
  //{{AFX_DATA(CCaptureDlg) ->?tB1}^  
  enum { IDD = IDD_CAPTURE_DIALOG }; du ~V=%9  
  CComboBox m_Key; co\Il]`R/  
  BOOL m_bControl; (_@]-   
  BOOL m_bAlt; ;ow)N <Z  
  BOOL m_bShift; LjGZp"&{  
  CString m_Path; |cnps$fk~  
  CString m_Number; N2HD=[*cr  
  //}}AFX_DATA 'ZI8nMY  
  // ClassWizard generated virtual function overrides )qMbk7:v\  
  //{{AFX_VIRTUAL(CCaptureDlg) EN[T3 Y  
 public: k{vbi-^6rf  
  virtual BOOL PreTranslateMessage(MSG* pMsg); R@pY+d9qp  
 protected: <FU?^*~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5rbb ,*  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +C~d;p  
  //}}AFX_VIRTUAL YU8]W%  
  // Implementation ZB)R4  
 protected: N>*+Wg$Ne  
  HICON m_hIcon; J]Z~.f="  
  // Generated message map functions 6@8t>"}  
  //{{AFX_MSG(CCaptureDlg) 6| B9kh}  
  virtual BOOL OnInitDialog(); |LbAW /9a  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @q>Hl`a  
  afx_msg void OnPaint(); *-Yw%uR  
  afx_msg HCURSOR OnQueryDragIcon(); ?$)5NQB%  
  virtual void OnCancel(); 2IM 31 .  
  afx_msg void OnAbout(); 2'-"&d+ O  
  afx_msg void OnBrowse(); ti%RE:*  
  afx_msg void OnChange(); ,G}i:7  
 //}}AFX_MSG 9`N5$;NzY  
 DECLARE_MESSAGE_MAP() S:}"gwFM  
}; YK6'/2!  
#endif 'n-y*f  
B1!xr-kC  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file MA:5'n  
#include "stdafx.h" %EVgSF!r  
#include "Capture.h" 6uo;4}0  
#include "CaptureDlg.h" ~I+MuI[  
#include <windowsx.h> Q*%}w_D6f  
#pragma comment(lib,"hook.lib") b=/'c Q  
#ifdef _DEBUG B T"R"w  
#define new DEBUG_NEW 4RtAwB  
#undef THIS_FILE u)<s*jk  
static char THIS_FILE[] = __FILE__; 1VM2CgRa  
#endif oS..y($TI  
#define IDM_SHELL WM_USER+1 JL1A3G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8vR_WHsL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '-RacNY  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; [ C0v -  
class CAboutDlg : public CDialog ~o%igJ }.C  
{ 9)'f)60^  
 public: qJdlZW<  
  CAboutDlg(); 6u+aP  
  // Dialog Data jO&*E 'pk  
  //{{AFX_DATA(CAboutDlg) @pYEzizP7  
  enum { IDD = IDD_ABOUTBOX }; u>"0 >U  
  //}}AFX_DATA pCh v;  
  // ClassWizard generated virtual function overrides W~ET/h  
  //{{AFX_VIRTUAL(CAboutDlg) k[ro[E  
 protected: A'KH_])  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tWIJ,_8l  
  //}}AFX_VIRTUAL P$z_A8}  
  // Implementation _&#{cCo:  
 protected: .N qXdari  
  //{{AFX_MSG(CAboutDlg) @GFB{ ;=  
  //}}AFX_MSG (\{k-2t*^  
  DECLARE_MESSAGE_MAP() R^*baiXVI  
}; _2!8,MX  
aaFT   
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |R0f--;  
{ kJ_8|  
 //{{AFX_DATA_INIT(CAboutDlg) s;Gd`-S>d  
 //}}AFX_DATA_INIT RPW46l34  
}  1[SG.  
ai/|qYf  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) W}CM;~*L  
{ (jc& Fk  
 CDialog::DoDataExchange(pDX); H3D<"4Q>  
 //{{AFX_DATA_MAP(CAboutDlg) X@\W* nq  
 //}}AFX_DATA_MAP qcj {rG18  
} I x%>aee  
XVN`J]XHk  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?Afe }  
 //{{AFX_MSG_MAP(CAboutDlg) 3#>W\_FY*D  
 // No message handlers }uZs)UQ|$  
 //}}AFX_MSG_MAP GXtK3YAr  
END_MESSAGE_MAP() Cq\XLh `  
SeD}H=,@  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) %y6(+I #P  
: CDialog(CCaptureDlg::IDD, pParent) -fq  
{ .5(YL8d  
 //{{AFX_DATA_INIT(CCaptureDlg) 1[!v{F%]  
  m_bControl = FALSE; .S/ 5kLul  
  m_bAlt = FALSE; f4"UI-8;n  
  m_bShift = FALSE; B.q/}\ ?(  
  m_Path = _T("c:\\"); y7,I10:D  
  m_Number = _T("0 picture captured."); h1w({<q*ov  
  nCount=0; 8=`L#FkRp  
  bRegistered=FALSE; m4mE7Wn.3  
  bTray=FALSE; d y HC8  
 //}}AFX_DATA_INIT 9n& &`r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 +OE!Uqnt  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); C^J<qq &  
} tVAi0`DV  
Ie.*x'b?y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) V?uT5.B2  
{ \MP~}t}c  
 CDialog::DoDataExchange(pDX); >h\y1IrAaG  
 //{{AFX_DATA_MAP(CCaptureDlg) yLnQ9BXB&  
  DDX_Control(pDX, IDC_KEY, m_Key); UMoj9/-  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5=pE*ETJ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); pU$k{^'UK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $w0TEO!  
  DDX_Text(pDX, IDC_PATH, m_Path); YOl$sgg}  
  DDX_Text(pDX, IDC_NUMBER, m_Number); SqM>xm  
 //}}AFX_DATA_MAP tT}b_r7h(1  
} V}jGxt0  
o(*\MT t?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) M/N8bIC! Q  
//{{AFX_MSG_MAP(CCaptureDlg) 5h5izA'0'  
 ON_WM_SYSCOMMAND() XF!L.'zH  
 ON_WM_PAINT() Z`Y&cKsn  
 ON_WM_QUERYDRAGICON() DrJ?bG;[  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) UA>=# $  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Bs"D<r&ro  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7v5]% %E/  
//}}AFX_MSG_MAP 2u3Kyn  
END_MESSAGE_MAP() AV5={KK  
S!(3-{nC  
BOOL CCaptureDlg::OnInitDialog() lvW T  
{ (95|DCL  
 CDialog::OnInitDialog(); vqm|D&HU  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J p'^!  
 ASSERT(IDM_ABOUTBOX < 0xF000); TnF~'RZYb  
 CMenu* pSysMenu = GetSystemMenu(FALSE); i2=- su  
 if (pSysMenu != NULL) 1d5%(:@  
 { 2"IV  
  CString strAboutMenu; @<\oM]jX  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ={g)[:(C.  
  if (!strAboutMenu.IsEmpty()) D2$ 9$xeR  
  { j-<-!jTd  
   pSysMenu->AppendMenu(MF_SEPARATOR); i|eX X)$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); IMf|/a9-  
  } +kL7"  
 } lw@Yn>eza  
 SetIcon(m_hIcon, TRUE); // Set big icon ,P eR}E;c  
 SetIcon(m_hIcon, FALSE); // Set small icon 6S`_L  
 m_Key.SetCurSel(0); Z)@vJZ*7(  
 RegisterHotkey(); B2;P%B  
 CMenu* pMenu=GetSystemMenu(FALSE); wvv+~K9jq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); H*=cw<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); G6G Bqp6|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Rl?1|$%  
 return TRUE; // return TRUE unless you set the focus to a control %2QGbnt_*  
} :?M_U;;z2+  
`<7\Zl  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !0;AFv`\  
{ p6DI7<C<H  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) E7X6RB b  
 { v;,W ^#`  
  CAboutDlg dlgAbout; 4.O)/0sU  
  dlgAbout.DoModal(); ~74Sq'j9Wt  
 } b}! cEJY  
 else (\6E.Z#  
 { vk7IqlEQ  
  CDialog::OnSysCommand(nID, lParam); *!QmYH5r0  
 } j7}mh  
} @Jd&[T27Lr  
\BHZRytQF  
void CCaptureDlg::OnPaint() t&?jJ7 (&8  
{ 01.q9AGy  
 if (IsIconic()) <cTX;&0=  
 { ,DFN:uf=l  
  CPaintDC dc(this); // device context for painting AiHU*dp6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); <*5S7)]BP  
  // Center icon in client rectangle pwo$qs(p  
  int cxIcon = GetSystemMetrics(SM_CXICON); +SFFwjI  
  int cyIcon = GetSystemMetrics(SM_CYICON); T+Yv5l  
  CRect rect; ZqclmCi  
  GetClientRect(&rect); a6 Vfd&  
  int x = (rect.Width() - cxIcon + 1) / 2; $}/tlA&e  
  int y = (rect.Height() - cyIcon + 1) / 2; *7AB0y0k  
  // Draw the icon byM%D$R  
  dc.DrawIcon(x, y, m_hIcon); Tvv>9gS  
 } Uu7]`Ul  
 else "51/,D  
 { @qNY"c%HV  
  CDialog::OnPaint(); ag'hHFV  
 } bF _]j/  
} v!I z&M:z  
& AK\Pw)  
HCURSOR CCaptureDlg::OnQueryDragIcon() DuC#tDP  
{ LATizu  
 return (HCURSOR) m_hIcon; [{Wo:c9Qq1  
} Bz'.7" ":0  
N8 2 6xvA  
void CCaptureDlg::OnCancel() 5( <O?#P  
{ L&6^(Bn   
 if(bTray) 2TGND-(j  
  DeleteIcon(); Noj*K6  
  CDialog::OnCancel(); HzM\<YD  
} M6wH$!zRa  
WN]k+0#  
void CCaptureDlg::OnAbout() q 4Pv\YO  
{ _i>_Sn1"  
 CAboutDlg dlg; (Z<@dkO?)  
 dlg.DoModal(); 82FEl~,^E  
} l2;$qNAo  
I'xc$f_+  
void CCaptureDlg::OnBrowse() T.cTL.}  
{ tQ@7cjq8bA  
 CString str; U-DQ?OtmC@  
 BROWSEINFO bi; D2VYw<tEA  
 char name[MAX_PATH]; 4L>8RiiQE;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); A\?t^T  
 bi.hwndOwner=GetSafeHwnd(); 2#NnA3l]x%  
 bi.pszDisplayName=name; g7323m1=  
 bi.lpszTitle="Select folder"; <,$*(dX)(  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9Qszr=C0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); by1q"\-,  
 if(idl==NULL) -aBhN~  
  return; r )~?5d  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); OGcdv{ ,P  
 str.ReleaseBuffer(); L{~ ]lUo  
 m_Path=str; L:C/PnIV  
 if(str.GetAt(str.GetLength()-1)!='\\') !RJ@;S  
  m_Path+="\\"; i'<hT q4  
 UpdateData(FALSE); AyQ5jkIE^{  
} <e#v9=}DI  
MP}-7UA#K  
void CCaptureDlg::SaveBmp() 2MB>NM<xO  
{ hqeknTGsIn  
 CDC dc; Xc+YoA0Ez  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); G1it 3^*$  
 CBitmap bm; AAfhh5i  
 int Width=GetSystemMetrics(SM_CXSCREEN); . AA# G  
 int Height=GetSystemMetrics(SM_CYSCREEN); i-w<5pGnf  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )'jGf;du  
 CDC tdc; tX% C5k  
 tdc.CreateCompatibleDC(&dc); ()j)}F#Z`  
 CBitmap*pOld=tdc.SelectObject(&bm); Fep@VkN  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Zz (qc5o,F  
 tdc.SelectObject(pOld); gna!Q  
 BITMAP btm; *0oa2fz%  
 bm.GetBitmap(&btm); ThP~k9-  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; De 3;}]wC  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); B (eXWWT_  
 BITMAPINFOHEADER bih; wx-&(f   
 bih.biBitCount=btm.bmBitsPixel; ?VxQ&^|  
 bih.biClrImportant=0; xBc$qjV  
 bih.biClrUsed=0; K8KN<Q s]  
 bih.biCompression=0; !!A(A^s  
 bih.biHeight=btm.bmHeight; o1 27? ^  
 bih.biPlanes=1; Jv 5l   
 bih.biSize=sizeof(BITMAPINFOHEADER); Q,9KLi3  
 bih.biSizeImage=size; >9XG+f66E  
 bih.biWidth=btm.bmWidth; qm#?DSLap  
 bih.biXPelsPerMeter=0; | #a{1Z)  
 bih.biYPelsPerMeter=0; tag)IWAiE  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Z  OAg7  
 static int filecount=0; kL s{B  
 CString name; ?r]0%W^  
 name.Format("pict%04d.bmp",filecount++); G~_eBy  
 name=m_Path+name; ZH=Bm^  
 BITMAPFILEHEADER bfh; ej7N5~!,s  
 bfh.bfReserved1=bfh.bfReserved2=0; P\[K)N/1  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B4*,]lS?  
 bfh.bfSize=54+size; ku57<kb  
 bfh.bfOffBits=54; 3bLOT#t  
 CFile bf; )2Q0NbDn  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _ZWU~38PM  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); i< imE#  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); L#D)[v"  
  bf.WriteHuge(lpData,size); uFuH/(}K[  
  bf.Close(); U3aM^  
  nCount++; ^eoW+OxH  
 } <Qbqxw  
 GlobalFreePtr(lpData); # mM9^LJ   
 if(nCount==1) ~yngH0S$[b  
  m_Number.Format("%d picture captured.",nCount); Ozulp(8*  
 else -NzOX"V]3  
  m_Number.Format("%d pictures captured.",nCount); $D^27q:H  
  UpdateData(FALSE); 1*#hIuoj'  
} d]_].D$  
u,@ac[!vP  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V#4oxkm  
{ p&xj7qwp@F  
 if(pMsg -> message == WM_KEYDOWN) blG?("0!  
 { #~rQ\A!4  
  if(pMsg -> wParam == VK_ESCAPE) <|3F('Q"  
   return TRUE; HA$7Q~{N-t  
  if(pMsg -> wParam == VK_RETURN) DDT]A<WUV  
   return TRUE; 4;jAdWj3  
 } %0u5d$bq  
 return CDialog::PreTranslateMessage(pMsg); /lHs]) ,  
} <X5V]f  
5M>SrZH  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |e+r~).4B  
{ pP\^bjI   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ sBxCi~  
  SaveBmp(); o9{1_7K  
  return FALSE; ]G! APE  
} DM,;W`|6%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ g]b%<DJ  
 CMenu pop; !*wd d8   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); aO:A pOAO  
 CMenu*pMenu=pop.GetSubMenu(0); UBuG12U4Y  
 pMenu->SetDefaultItem(ID_EXITICON); JV;VR9-l  
 CPoint pt; 1JGww]JZo  
 GetCursorPos(&pt); ]VN1Y)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wC<FF2T  
 if(id==ID_EXITICON) ^sJp!hi4=)  
  DeleteIcon(); cnDBT3$~Z  
 else if(id==ID_EXIT) li`  
  OnCancel(); x;7p75Wm  
 return FALSE; ~4S6c=:  
} rG B*a8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {X\FS   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) &9n=!S'Md  
 AddIcon(); "W}+~Sn  
 return res; !uKuO  
} i8/"|+Z  
<U /r U9O  
void CCaptureDlg::AddIcon() eA9r M:  
{ ^X*l&R_=R  
 NOTIFYICONDATA data; [!#;QQ&M  
 data.cbSize=sizeof(NOTIFYICONDATA); Kku@!lv  
 CString tip; {*Qx^e`h$.  
 tip.LoadString(IDS_ICONTIP); m?)F@4]  
 data.hIcon=GetIcon(0); PiX(Ase  
 data.hWnd=GetSafeHwnd(); T,4REbm^  
 strcpy(data.szTip,tip); HxShNU  
 data.uCallbackMessage=IDM_SHELL; J\ ?  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |uA /72  
 data.uID=98; ZN`I4Ak  
 Shell_NotifyIcon(NIM_ADD,&data); ,5|@vW2@u  
 ShowWindow(SW_HIDE); @%As>X<3t  
 bTray=TRUE; eG5xJA^  
} )9rJ]D^B  
f:A1j\A?  
void CCaptureDlg::DeleteIcon() W'C~{}c=  
{ 0~nub  
 NOTIFYICONDATA data; >uz3 O?z P  
 data.cbSize=sizeof(NOTIFYICONDATA); :LR>U;2  
 data.hWnd=GetSafeHwnd(); [Kanj/  
 data.uID=98; iC<qWq|S_m  
 Shell_NotifyIcon(NIM_DELETE,&data); %y\  
 ShowWindow(SW_SHOW); ?7aeY5p  
 SetForegroundWindow(); O ;B[ZMV  
 ShowWindow(SW_SHOWNORMAL); <3b Ft[  
 bTray=FALSE; .u9,w  
} zO)3MC7l*  
*f+DV[DF  
void CCaptureDlg::OnChange() jL#`CD  
{ +zsB~Vz  
 RegisterHotkey(); (, uW-  
} kCU (Hi`Q  
CF@j]I@{   
BOOL CCaptureDlg::RegisterHotkey() USyOHHPW@  
{ HY7#z2L  
 UpdateData(); *Ag,/Cm]  
 UCHAR mask=0; XXPpj< c  
 UCHAR key=0; V5HK6-T  
 if(m_bControl) T [2l32  
  mask|=4; @7,k0H9Moa  
 if(m_bAlt) +T]D\];D  
  mask|=2; `KmM*_a  
 if(m_bShift) .L}k-8  
  mask|=1; :PDyc(s{  
  key=Key_Table[m_Key.GetCurSel()]; </jTWc'}  
 if(bRegistered){ W v!%'IB  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Dt*/tVF  
  bRegistered=FALSE; 59M\uVWR  
 } W 33MYw  
 cMask=mask; v,A8Mk2s#  
 cKey=key; Lk1e{! a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); NuC+iC$_/  
 return bRegistered; F>s5<pKAX  
} ppK`7J>Z  
#>dj!33  
  四、小结 ]?a i  
) i=.x+Q  
  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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