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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: <5rp$AzT  
  A 'rfoA6  
  一、实现方法 ({i}EC7{  
W~2`o*\l  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Vb az#I  
1[OCojo<  
#pragma data_seg("shareddata") w2_$>z  
HHOOK hHook =NULL; //钩子句柄 ~cQ./G4  
UINT nHookCount =0; //挂接的程序数目 :{bvCos<)  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #mLF6 "A  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 u6Fm qK]Dj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey .(^KA{  
static int KeyCount =0; b^_#f:_j  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 {D J!T  
#pragma data_seg() \]dx;,T  
S\b[Bq  
  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。 X|fl_4NC>  
K?o( zh;  
  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: o8;>E>;  
ZpvURp,I  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR WcqQR))n  
cKey,UCHAR cMask) ^0p y  
{ N}Q%y(O^  
 BOOL bAdded=FALSE; 0Am&:kX't  
 for(int index=0;index<MAX_KEY;index++){ w$8Su:g=  
  if(hCallWnd[index]==0){ m1H_kJ  
   hCallWnd[index]=hWnd; 0F> ils  
   HotKey[index]=cKey; "c` $U]M%  
   HotKeyMask[index]=cMask; }7&.FV "  
   bAdded=TRUE; W{:^P0l  
   KeyCount++; /I}#0}  
   break; i#]}k  
  } PKFjM~J  
 } zrVw l\&  
 return bAdded; ,r^zDlS<q  
} KM li!.(b  
//删除热键 EK`}?>'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KK$t3e)  
{ ZFwUau  
 BOOL bRemoved=FALSE; uNSaw['0j  
 for(int index=0;index<MAX_KEY;index++){   @a2n{  
  if(hCallWnd[index]==hWnd){ "`HkAW4GZa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4Bg"b/kF  
    hCallWnd[index]=NULL; sh;DCd  
    HotKey[index]=0; HO[W2b  
    HotKeyMask[index]=0; '[(]62j  
    bRemoved=TRUE; '0q.zzv|_  
    KeyCount--; +9Q,[)e r  
    break; 3kfrOf.4h  
   } NV\t%/ ?  
  } N$]B$vv  
 } ehCGu( =  
 return bRemoved; )N$T&  
} Nc;cb  
d1CQ;,Df<  
@9#l3  
  DLL中的钩子函数如下: ~ +DPq|-O  
j"=F\S&!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) c"D%c(:4|  
{ ? 1Os%9D*  
 BOOL bProcessed=FALSE; DS;,@$N_N  
 if(HC_ACTION==nCode) @A32|p}  
 { fk%W0 7x!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1OI/!!t1$  
   switch(wParam) r{\c. \  
   {  R(p`H}^  
    case VK_MENU: TL u+5f  
     MaskBits&=~ALTBIT; A1>fNilC9  
     break; oP >+2.i  
    case VK_CONTROL: y buKwZFC  
     MaskBits&=~CTRLBIT; >s dT=6v  
     break; -)N, HAM>  
    case VK_SHIFT: U<<@(d%T  
     MaskBits&=~SHIFTBIT; ozaM!ee\z  
     break; \jA#RF.W  
    default: //judge the key and send message RW"QUT  
     break; vq?Lej  
   } 4# +i\H`  
   for(int index=0;index<MAX_KEY;index++){ )+Gw Yt  
    if(hCallWnd[index]==NULL) ZZ'5BfI"I%  
     continue; hp|.hN(kS]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lV%oIf[OB  
    { CcCcuxtR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qAI %6d  
     bProcessed=TRUE; T'6MAxEZUq  
    } B^;"<2b*  
   } +/+>:  
  } `:b*#@  
  else if((lParam&0xc000ffff)==1){ //有键按下 ?iXN..6x  
   switch(wParam) _c!$K#Yl{  
   { xP{)+$n  
    case VK_MENU: r=}v` R&  
     MaskBits|=ALTBIT; i,V,0{$  
     break; =D~>$ Y  
    case VK_CONTROL: JjMa   
     MaskBits|=CTRLBIT; d#8 n<NM  
     break; [&(~{#}M:  
    case VK_SHIFT: hs^K9Jt  
     MaskBits|=SHIFTBIT; XoNBq9Iu  
     break; IL>VH`D  
    default: //judge the key and send message B,S~Idr}  
     break; bZ 0{wpeK=  
   } &9Kni/  
   for(int index=0;index<MAX_KEY;index++){ -UB XWl  
    if(hCallWnd[index]==NULL) }INj~d<:  
     continue; TJ_Wze-lQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gpw,bV  
    { OLS/3c z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X aE;i57$l  
     bProcessed=TRUE; ;kD UQw  
    } \>$3'i=mQ  
   } rP{Jep!  
  } v<3KxP'a  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 =h\unQ1T  
   for(int index=0;index<MAX_KEY;index++){ V O\g"Yc  
    if(hCallWnd[index]==NULL) sOJXloeO[6  
     continue; X $2f)3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) I>EEUQR/$H  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); OwCbv j0 #  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 oGRd ;hsF  
   } q6PG=9d0B  
  } S4U}u l  
 } [H[L};%=j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); KAJR.YNm  
} R53^3"q~  
Xp+lpVcJ  
  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: r;^%D(  
lqTc6@:D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r2*8.j51  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NkV81?  
A?bqDy  
  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: uH&B=w  
i E?yvtr8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) b>2{F6F  
{ ZkJLq[:cM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) A.vf)hO  
 {  PI.Zd1r  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Z;<:=#  
  SaveBmp(); KKq%'y)u^  
  return FALSE; $cW t^B'  
 } %*NED zy  
 …… //其它处理及默认处理 -7KoR}Ck!  
} P;`Awp?  
jF-:e;-  
&,P; 7R  
  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。 a&2UDl%K  
[vY#9W"!  
  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。 5Gs>rq" #  
[D+,I1u2h  
  二、编程步骤 fGd1  
8@[S,[  
  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"; )@ofczl6  
IH&0>a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -=cm7/X  
_NB*+HVo  
  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; DRpF EWsm  
>F>VlRg  
  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; km*Y#`{  
h'HI92; [  
  5、 添加代码,编译运行程序。 DcNp-X40I  
UZdGV?o ?  
三、程序代码 K {kd:pr  
$q*a}d[Q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Er;qs*f  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) NLra"Z  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^Ze(WE)  
#if _MSC_VER > 1000 #mU<]O  
#pragma once &b`'RZe  
#endif // _MSC_VER > 1000 gnGh )  
#ifndef __AFXWIN_H__ !Rc %  
#error include 'stdafx.h' before including this file for PCH cQ]c!G|a4  
#endif k'_f?_PBu  
#include "resource.h" // main symbols *MS$C$HOq  
class CHookApp : public CWinApp r.'xqzF/  
{ sv!zY= 6  
 public: eR,/} g\  
  CHookApp(); c4u/tt.)  
  // Overrides P-a8S*RRa  
  // ClassWizard generated virtual function overrides Rc:}%a%e  
  //{{AFX_VIRTUAL(CHookApp) >|z:CX$]  
 public: !u'xdV+bf  
  virtual BOOL InitInstance(); "F}dZ  
  virtual int ExitInstance(); z#Fel/L`O  
  //}}AFX_VIRTUAL q 'd]  
  //{{AFX_MSG(CHookApp) S6}_N/;6~  
  // NOTE - the ClassWizard will add and remove member functions here. |{Ex)hkw  
  // DO NOT EDIT what you see in these blocks of generated code ! x|yJCs>  
  //}}AFX_MSG {?Nm"#  
  DECLARE_MESSAGE_MAP() }`2a>N: &  
}; ^.R!sQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); eKy!Pai  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w\MWr+4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O_qwD6s-_  
BOOL InitHotkey(); t V( WhP  
BOOL UnInit(); I eJI-lo  
#endif 0 @!huk  
2*<Zc|uNW  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8h0CG]  
#include "stdafx.h" ilde<!?  
#include "hook.h" ImG8v[Q E  
#include <windowsx.h> hsQDRx%H}  
#ifdef _DEBUG ;<q 2  
#define new DEBUG_NEW ! d<R =L  
#undef THIS_FILE =%<, ^2o  
static char THIS_FILE[] = __FILE__; uJCp  
#endif "AZ|u#0P  
#define MAX_KEY 100 bZ1*:k2  
#define CTRLBIT 0x04 7)]boW~Q  
#define ALTBIT 0x02 AmHj\NX$  
#define SHIFTBIT 0x01 P JATRJ1.  
#pragma data_seg("shareddata") _7\`xU  
HHOOK hHook =NULL; sQ340!  
UINT nHookCount =0; aoZ| @x  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g<(!>:h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0VcHz$ 6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey "b~C/-W I  
static int KeyCount =0; umWs8-'Uw  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?)J/uU2w  
#pragma data_seg() D{s87h  
HINSTANCE hins; i%!<6K6UT  
void VerifyWindow(); $K!Jm7O\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -yB}(69  
//{{AFX_MSG_MAP(CHookApp) xh bN=L  
// NOTE - the ClassWizard will add and remove mapping macros here. y%ij)vQY  
// DO NOT EDIT what you see in these blocks of generated code! jhf# gdz%  
//}}AFX_MSG_MAP L /:^;j`c  
END_MESSAGE_MAP() \#(1IC`as  
_qR?5;v  
CHookApp::CHookApp() YTFU# F  
{ 26g]_Igq  
 // TODO: add construction code here, w$/lq~zU  
 // Place all significant initialization in InitInstance h$kz3r;b,"  
} ;  ?f+  
o S=!6h  
CHookApp theApp; 4VZI]3K,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) , + G  
{ t$(#$Z,RS  
 BOOL bProcessed=FALSE; CDM6o!ur3  
 if(HC_ACTION==nCode) |,p"<a!+{w  
 { WM`3QJb  
  if((lParam&0xc0000000)==0xc0000000){// Key up COsmVQ.  
   switch(wParam) J/'Fj?  
   { g kO^J{_@q  
    case VK_MENU: },j |eA/W  
     MaskBits&=~ALTBIT; 9c[X[ Qc  
     break; {QM rgyQ E  
    case VK_CONTROL: EP#2it]0]  
     MaskBits&=~CTRLBIT; uUg;v/:  
     break; tu<<pR>  
    case VK_SHIFT: BW7AjtxQ&  
     MaskBits&=~SHIFTBIT; Sc]K-]1(H  
     break; iq*im$9 J  
    default: //judge the key and send message x)*Lu">  
     break; 72d|Jbd  
   } ?/OF=C#  
   for(int index=0;index<MAX_KEY;index++){ ~*7$aj  
    if(hCallWnd[index]==NULL) 0t? o6 e  
     continue; o3dqsQE%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )`rD]0ua;  
    { I4G0 !"T+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LWv<mtuYf  
     bProcessed=TRUE; 5aizWz  
    } T8a' 6otc  
   } y<kUGsD  
  } RbL?(  
  else if((lParam&0xc000ffff)==1){ //Key down ,Q56A#Y\  
   switch(wParam) @KK6JyOTQ  
   { U}5fjY  
    case VK_MENU: =}#yi<Lt  
     MaskBits|=ALTBIT; JY2<ECO  
     break; T4] 2R  
    case VK_CONTROL: F*[E28ia&  
     MaskBits|=CTRLBIT; B^/MwD>%  
     break; #zTy7ZS,0  
    case VK_SHIFT: ):'wxIVGI  
     MaskBits|=SHIFTBIT; 86OrJdD8  
     break; -y-}g[`  
    default: //judge the key and send message 3A!a7]fW  
     break; >O?WRC B  
   } sNDo@u7  
   for(int index=0;index<MAX_KEY;index++) 5P\>$N1p  
   { x|a&wC2,{  
    if(hCallWnd[index]==NULL) iT :3e%  
     continue; Z?{\34lPj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ot<d FvD  
    { p[JIH~nb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AOZ C D{  
     bProcessed=TRUE; 3<&:av3  
    } YSeH;<'  
   } >`0U2K  
  } rS_G;}Zr  
  if(!bProcessed){ 9>&zOITTaL  
   for(int index=0;index<MAX_KEY;index++){ bI &<L O  
    if(hCallWnd[index]==NULL) @4*:qj?  
     continue; G`zNCx.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Mpojabsh  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D{N8q^Cs9  
   } GK}52,NM  
  } M!J7Vj?Ps  
 } d <}'eBT'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); kM506U<g  
} TI DgIK  
_li3cXE  
BOOL InitHotkey() 'hjEd.  
{ H ni^S  
 if(hHook!=NULL){ ML_VD*t9  
  nHookCount++; &#2&V>pE  
  return TRUE; fB3Jp~$  
 } X%'z  
 else "@&TC"YG0  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); f\hMTebma$  
  if(hHook!=NULL) ]?4;Lw  
   nHookCount++; ~o!- [  
  return (hHook!=NULL); %*gf_GeM  
} J =^IS\m  
BOOL UnInit() "tCTkog3]  
{ `MVqd16Y  
 if(nHookCount>1){ PT2;%=f  
  nHookCount--; L(TM& ps\-  
  return TRUE; P~trxp=k  
 } @GN2v,WA?  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 0SL{J*S4[#  
 if(unhooked==TRUE){ PyQ .B*JJ  
  nHookCount=0; S[F06.(1  
  hHook=NULL; -'$ob~*  
 } +]%S}<R  
 return unhooked; T'5{p  
} j9NF|  
b)I-do+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5*$yY-A  
{ Cq2Wpu-u  
 BOOL bAdded=FALSE; k4ti#3W5eG  
 for(int index=0;index<MAX_KEY;index++){ ,s~l; Gkj  
  if(hCallWnd[index]==0){ 5?-HQoT)G  
   hCallWnd[index]=hWnd; r"dIB@  
   HotKey[index]=cKey; ]W5*R07  
   HotKeyMask[index]=cMask; 7'IIB1v.\  
   bAdded=TRUE; BD C DQ  
   KeyCount++; =K`.$R  
   break; \1<'XVS  
  } L0wT:x*  
 } ^o3,YH  
 return bAdded; eq6O6-  
} DC8#b`j  
L0g+RohW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e#C v*i_<  
{ zgAU5cw  
 BOOL bRemoved=FALSE; (GmBv  
 for(int index=0;index<MAX_KEY;index++){ ^ j\LB23  
  if(hCallWnd[index]==hWnd){ h0PDFMM<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *9j'@2!M  
    hCallWnd[index]=NULL; z)3TB&;  
    HotKey[index]=0; 1q7&WG  
    HotKeyMask[index]=0; a4,V(Hlm  
    bRemoved=TRUE; .==D?#bn  
    KeyCount--; 6iU&9Z<%  
    break; 8o5[tl ?w  
   } [{7#IZL  
  }  _<S!tW  
 } st RM *.  
 return bRemoved; = 7y-o  
} yLC[-.H  
|o5eG><  
void VerifyWindow() [inlxJD  
{ >-MnB  
 for(int i=0;i<MAX_KEY;i++){ WN'AQ~qA  
  if(hCallWnd!=NULL){ $@z77td3  
   if(!IsWindow(hCallWnd)){ U?0|2hR~  
    hCallWnd=NULL; H+[?{+"#@l  
    HotKey=0; 1 (<n^\J(  
    HotKeyMask=0; eI1zRoIl-  
    KeyCount--; jSem/;  
   } Av.tr&ZNb  
  } Y7t#)?  
 } A 6S0dX  
} dtR"5TL<~}  
['mpxtG  
BOOL CHookApp::InitInstance() k)b{ UFRW  
{ 7h 54j  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); W[&nQW$E  
 hins=AfxGetInstanceHandle(); <&E}db  
 InitHotkey(); =2p?_.|'  
 return CWinApp::InitInstance(); Ypyi(_G(?>  
} o,rF15  
O=o}uB-*6  
int CHookApp::ExitInstance() (K[{X0T  
{ 9<Pg2#*N0  
 VerifyWindow(); =0cTct6\  
 UnInit(); OR@ 67Y  
 return CWinApp::ExitInstance(); 9kD#'BxC  
} 8T3,56 >  
g6Vkns4  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "|3I|#s  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) S\:^#Yi`  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [K4cxqlfk  
#if _MSC_VER > 1000 &ivU4rEG  
#pragma once >#G%2Vp  
#endif // _MSC_VER > 1000 OWvblEBF  
^?lpY{aa  
class CCaptureDlg : public CDialog tYD8Y  
{ ^OV; P[  
 // Construction P'<i3#;7X  
 public: ` i[26Qb  
  BOOL bTray; E'WXi!>7p  
  BOOL bRegistered; ?IGp?R^j"  
  BOOL RegisterHotkey(); 2|,$#V=  
  UCHAR cKey; nd' D0<%  
  UCHAR cMask; p.W7>o,[w  
  void DeleteIcon(); oKn$g[,SJh  
  void AddIcon(); 1`8s "T  
  UINT nCount; N?@^BZ  
  void SaveBmp(); J*zzjtY( 1  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Al yJ!f"Y  
  // Dialog Data f+:iz'b#U  
  //{{AFX_DATA(CCaptureDlg) $wM..ee  
  enum { IDD = IDD_CAPTURE_DIALOG }; ,Q"'q0hM=  
  CComboBox m_Key; k[x-O?$O@  
  BOOL m_bControl; K&[0`sH!  
  BOOL m_bAlt; p\[!=ZXFr\  
  BOOL m_bShift; 5HbHJ.|r  
  CString m_Path; &y_t,8>5  
  CString m_Number; ?\\wLZ  
  //}}AFX_DATA 8-G )lyfj  
  // ClassWizard generated virtual function overrides Q6(~VvC-  
  //{{AFX_VIRTUAL(CCaptureDlg) Y(,RJ&7  
 public: 2O kID WcM  
  virtual BOOL PreTranslateMessage(MSG* pMsg); !~E/Rp  
 protected: IOFXkpK R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]xvA2!) Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); I$"Z\c8;  
  //}}AFX_VIRTUAL mP^B2"|q  
  // Implementation #eJfwc1JY  
 protected: ?xaUWD  
  HICON m_hIcon; ;2kQ)Bq"  
  // Generated message map functions kQ=bd{a6  
  //{{AFX_MSG(CCaptureDlg) 6/;YS[jX  
  virtual BOOL OnInitDialog(); +C`!4v\n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1EV bGe%b  
  afx_msg void OnPaint(); v/ry" W  
  afx_msg HCURSOR OnQueryDragIcon(); 7@{%S~TN  
  virtual void OnCancel(); ^JY {<   
  afx_msg void OnAbout(); !{l% 3'2  
  afx_msg void OnBrowse(); ?c8~VQaQ  
  afx_msg void OnChange(); _f!ko<52  
 //}}AFX_MSG I[%IW4jJ  
 DECLARE_MESSAGE_MAP() %E%=Za  
}; .w4|$.H  
#endif z_'^=9m  
n~lB}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file o*$KiD  
#include "stdafx.h" nDn+lWA=g  
#include "Capture.h" gxhp7c182  
#include "CaptureDlg.h" 'N{1b_v?  
#include <windowsx.h> <);j5)/  
#pragma comment(lib,"hook.lib") ~;(\a@ _  
#ifdef _DEBUG cEHpa%_5  
#define new DEBUG_NEW IEm?'o:  
#undef THIS_FILE u/W{JPlL  
static char THIS_FILE[] = __FILE__; %ZRv+}z  
#endif Z*Ffdh>*:&  
#define IDM_SHELL WM_USER+1 :+ YHj )mN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); TD\TVK3P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .EhC\QpP  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; f?Ex$gnI  
class CAboutDlg : public CDialog 2@(+l*.Q  
{ ta&z lZt  
 public: iB0r+IbR  
  CAboutDlg(); U,b80%k:  
  // Dialog Data vT5GUO{5  
  //{{AFX_DATA(CAboutDlg) b$2=w^*  
  enum { IDD = IDD_ABOUTBOX }; 3~`\FuHHe  
  //}}AFX_DATA 3+>R%TX6i<  
  // ClassWizard generated virtual function overrides dtuCA"D  
  //{{AFX_VIRTUAL(CAboutDlg) .;?ha'  
 protected: *effDNE!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support igOX0  
  //}}AFX_VIRTUAL _U*R_2aV  
  // Implementation O4-#)#-)S~  
 protected: xpa+R^D5G  
  //{{AFX_MSG(CAboutDlg) dZ|bw0~_!  
  //}}AFX_MSG N_D=j 6B  
  DECLARE_MESSAGE_MAP() }*XF- U  
};  mTH[*Y,  
(l][_6Q  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) .NdsKhg b  
{ ]oix))'n  
 //{{AFX_DATA_INIT(CAboutDlg) i8<5|du&?  
 //}}AFX_DATA_INIT oi Q3E  
} i.9}bw 9u@  
';eAaDM  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .dzw5R&  
{ 5@.8O VPz  
 CDialog::DoDataExchange(pDX); KUW )F  
 //{{AFX_DATA_MAP(CAboutDlg) 6+sz4  
 //}}AFX_DATA_MAP 9on$0  
} ?z`yNx6  
v*excl~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) KXTk.\c  
 //{{AFX_MSG_MAP(CAboutDlg) L^^f.w#m  
 // No message handlers "j%Gr :a  
 //}}AFX_MSG_MAP Y+S<?8pA  
END_MESSAGE_MAP() \.P'8As  
J{Ij  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <mLU-'c@  
: CDialog(CCaptureDlg::IDD, pParent) b0f6?s  
{ !6.LSY,E  
 //{{AFX_DATA_INIT(CCaptureDlg) ^N}{M$  
  m_bControl = FALSE; 7<jr0)  
  m_bAlt = FALSE; pC 4uar  
  m_bShift = FALSE; fk^DkV^<  
  m_Path = _T("c:\\"); 3Mh_ &%!O  
  m_Number = _T("0 picture captured."); o)\EfPT  
  nCount=0; [Qkj}  
  bRegistered=FALSE; Pd:tRY+t/  
  bTray=FALSE; CNiJuj`  
 //}}AFX_DATA_INIT fNr*\=$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e,vgD kI;  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :@~3wD[y  
} } 2y"F@{T  
};(2 na  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Rv*x'w ==  
{ ld~*w  
 CDialog::DoDataExchange(pDX); sN[q. M?  
 //{{AFX_DATA_MAP(CCaptureDlg) "=f,4Zbj  
  DDX_Control(pDX, IDC_KEY, m_Key); I~ SFY>s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); F8m@mh*8>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ~}YgZ/U7T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); mX SLH'  
  DDX_Text(pDX, IDC_PATH, m_Path); ({rescQB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); .@(MNq{"6  
 //}}AFX_DATA_MAP aj+I+r"~  
} ]N'4q}<5o  
xs  >Y  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mpCKF=KL.  
//{{AFX_MSG_MAP(CCaptureDlg) imS&N.*3m  
 ON_WM_SYSCOMMAND() Izfj 9h ?  
 ON_WM_PAINT() AQBr{^inH|  
 ON_WM_QUERYDRAGICON() 5o~AUo{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) JENq?$S  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) e3&.RrA  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Cvs4dd%)i  
//}}AFX_MSG_MAP ;S>ml   
END_MESSAGE_MAP() f#vVk  
bU(fH^  
BOOL CCaptureDlg::OnInitDialog() Vzrp9&loY  
{ vn5]+-I  
 CDialog::OnInitDialog(); ! F&{I  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d 7QWK(d  
 ASSERT(IDM_ABOUTBOX < 0xF000); n;dp%SD  
 CMenu* pSysMenu = GetSystemMenu(FALSE); FJ&?My,=J  
 if (pSysMenu != NULL) .!Q[kn0a  
 { |w^nCsv  
  CString strAboutMenu; 0w l31k{  
  strAboutMenu.LoadString(IDS_ABOUTBOX); v/Ei0}e6~  
  if (!strAboutMenu.IsEmpty()) !U+XIr  
  { {,m W7  
   pSysMenu->AppendMenu(MF_SEPARATOR); l3/?,xn  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9s6d+HhM  
  } c/}bx52>u  
 } *}i.,4+y   
 SetIcon(m_hIcon, TRUE); // Set big icon  F_%&,"$  
 SetIcon(m_hIcon, FALSE); // Set small icon Q,f5r%A.  
 m_Key.SetCurSel(0); *j= whdw%J  
 RegisterHotkey(); [[:wSAO>6'  
 CMenu* pMenu=GetSystemMenu(FALSE); b _0Xi  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); I%G6V a@  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); FZtIC77X5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \.dvRI'  
 return TRUE; // return TRUE unless you set the focus to a control ~); 7D'[  
} yX8$LOjE  
5SY(:!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) VJ(#FA2  
{ w+owx(mN@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #PRkqg+|  
 { U,u\o@3A  
  CAboutDlg dlgAbout; *X lnEHv  
  dlgAbout.DoModal(); cz9T,  
 } }" 'l8t0?  
 else P\H$*6v(  
 { VSt)~  
  CDialog::OnSysCommand(nID, lParam); fL&bN[XA"$  
 } J4ltHk.|  
} |P]>[}mD  
+lqX;*a=N  
void CCaptureDlg::OnPaint() ;/Dp  
{ :>g*!hpb  
 if (IsIconic()) DPZG_{3D  
 { B[O1^jdO  
  CPaintDC dc(this); // device context for painting #}!Ge  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {)0"?$C_H  
  // Center icon in client rectangle !_gHIJiq}  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZjXpMx,  
  int cyIcon = GetSystemMetrics(SM_CYICON); 3v%V\kO=F  
  CRect rect; cA4xx^~  
  GetClientRect(&rect); wGf SVA-q\  
  int x = (rect.Width() - cxIcon + 1) / 2; _6 |lw&o07  
  int y = (rect.Height() - cyIcon + 1) / 2; }A%Sx!7~  
  // Draw the icon *G#W],~0  
  dc.DrawIcon(x, y, m_hIcon); ~O}LAzGb  
 } v [ 4J0  
 else @nS+!t{  
 { V}kZowWD  
  CDialog::OnPaint(); G? "6[w/p  
 } 0xM\+R~,  
} 0"L_0 t:  
50.cMms  
HCURSOR CCaptureDlg::OnQueryDragIcon() y++[:M  
{ auTApYS53  
 return (HCURSOR) m_hIcon; \Z^YaKj&  
} Q_F8u!qrZ  
V4 PD]5ZW  
void CCaptureDlg::OnCancel() Xo>P?^c4?  
{ #yv_Eb02  
 if(bTray) >\ :kP>U  
  DeleteIcon(); K Zw"?%H[  
  CDialog::OnCancel(); f6ad@2  
} >8nRP%r[5,  
n LZ  
void CCaptureDlg::OnAbout() l(@UpV-  
{ O&?i8XsB  
 CAboutDlg dlg; iii2nmiK  
 dlg.DoModal(); Y\ len  
} bCF"4KXK  
[g:ZIl4p\P  
void CCaptureDlg::OnBrowse()  # xS8  
{ Bp`?inKBOd  
 CString str;  c6;tbL  
 BROWSEINFO bi; a 8Jn.!  
 char name[MAX_PATH]; ,tZWPF-  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Uzb~L_\Rmt  
 bi.hwndOwner=GetSafeHwnd(); jLf.qf8qm  
 bi.pszDisplayName=name; k!K}<sX2  
 bi.lpszTitle="Select folder"; shOQ/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d3# >\QCD9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); eEIa=MB*  
 if(idl==NULL) sV+/JDl  
  return; !K#Q[Ee  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q0I22?  
 str.ReleaseBuffer(); d([NU;  
 m_Path=str; jd|? aK;(  
 if(str.GetAt(str.GetLength()-1)!='\\') 0S0 ?\r  
  m_Path+="\\"; JZP>`c21y]  
 UpdateData(FALSE); +.T&U7xV  
} fYR*B0tu  
((TiBCF4  
void CCaptureDlg::SaveBmp() 8C2s-%:  
{ MS-}IHO  
 CDC dc; z )2h\S  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); YT6<1-E#  
 CBitmap bm; %SL'X`j  
 int Width=GetSystemMetrics(SM_CXSCREEN); cbD&tsF  
 int Height=GetSystemMetrics(SM_CYSCREEN); N*N@wJy:5  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @JS O=8  
 CDC tdc; cWSiJr):r  
 tdc.CreateCompatibleDC(&dc); ]VY}VALZ  
 CBitmap*pOld=tdc.SelectObject(&bm); : uglv6  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Rdd[b?  
 tdc.SelectObject(pOld); y-gSal  
 BITMAP btm; Q"KD O-t  
 bm.GetBitmap(&btm); F7wpGtt  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; oO-kO!59y  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); %l!Gt"\xm  
 BITMAPINFOHEADER bih; f:gXXigY,  
 bih.biBitCount=btm.bmBitsPixel; xioL6^(Qk,  
 bih.biClrImportant=0; xJ)hGPrAl  
 bih.biClrUsed=0; %Uj7 g>  
 bih.biCompression=0; rYbb&z!u  
 bih.biHeight=btm.bmHeight; A>8uLO G}  
 bih.biPlanes=1; .olDmFQD  
 bih.biSize=sizeof(BITMAPINFOHEADER); TOp|Qtn  
 bih.biSizeImage=size; @sRUl ,M;Z  
 bih.biWidth=btm.bmWidth; u;m[,  
 bih.biXPelsPerMeter=0; IP K.  
 bih.biYPelsPerMeter=0; ^~k2(DLk  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); @bQf =N+  
 static int filecount=0; 1-4iy_d  
 CString name; ,rT62w*e  
 name.Format("pict%04d.bmp",filecount++); RfVVAaI  
 name=m_Path+name; )54;YK  
 BITMAPFILEHEADER bfh; y| *X  
 bfh.bfReserved1=bfh.bfReserved2=0; S+G!o]&2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); C~Fdo0D  
 bfh.bfSize=54+size; 2?h c94  
 bfh.bfOffBits=54; mrR~[533j  
 CFile bf; p.kJNPO\@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]p/f@j?LU  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Q%6 1_l  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -NW7ncB|  
  bf.WriteHuge(lpData,size); Sdl1k+u  
  bf.Close(); u6{= Z:  
  nCount++; PMzPe"3M  
 } ;q&6WO  
 GlobalFreePtr(lpData); j] \3>.  
 if(nCount==1) Z?yMy zT  
  m_Number.Format("%d picture captured.",nCount); v`ckvl)(C  
 else b13XHR)0  
  m_Number.Format("%d pictures captured.",nCount); &L[7jA'[J  
  UpdateData(FALSE); 1'wwwxe7  
} rcUXYJCh-  
5(0f"zY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (he cvJ  
{ 7/nnl0u8  
 if(pMsg -> message == WM_KEYDOWN) dYdZt<6W<(  
 { &L[oQni];2  
  if(pMsg -> wParam == VK_ESCAPE) dGf:0xE"  
   return TRUE; x#ub % t  
  if(pMsg -> wParam == VK_RETURN) iq_y80g`8h  
   return TRUE; EY=`/~|c  
 } @giJ&3S,  
 return CDialog::PreTranslateMessage(pMsg); .:?X<=!S&t  
}  B@Acm  
z DDvXz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 42X N*br  
{ ;Z%PBMa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \~|+*^e)  
  SaveBmp(); q 65mR!)  
  return FALSE; "L'0"  
} ,f ..46G  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /,v>w,  
 CMenu pop; wg<UCmfu!  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %$K2$dq5  
 CMenu*pMenu=pop.GetSubMenu(0); "L yMw){  
 pMenu->SetDefaultItem(ID_EXITICON); 34ij5bko_)  
 CPoint pt; Ve,h]/G  
 GetCursorPos(&pt); acd8?>%[  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <T?H H$es)  
 if(id==ID_EXITICON) P%`|Tu!B  
  DeleteIcon(); w E^6DNh  
 else if(id==ID_EXIT) jiS|ara"  
  OnCancel(); Vsh7>|@  
 return FALSE; s ~'><ioh  
} H'N$Vv2q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); bqjj6bf'o  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) /5 rWcX  
 AddIcon(); 6(1xU\x  
 return res; 6E~T$^Q}  
} v0EF?$Wo  
>05_#{up  
void CCaptureDlg::AddIcon() ^B[%|{cO  
{ ATq)8Rm\  
 NOTIFYICONDATA data; TEC'}%   
 data.cbSize=sizeof(NOTIFYICONDATA); jx_n$D  
 CString tip; M>H4bU(  
 tip.LoadString(IDS_ICONTIP); 5 fpBzn$  
 data.hIcon=GetIcon(0); xlQl1lOX  
 data.hWnd=GetSafeHwnd(); 9GdQ$^m  
 strcpy(data.szTip,tip); %YjZF[P  
 data.uCallbackMessage=IDM_SHELL; cR.[4rG'  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; FwU*]wx|{  
 data.uID=98; gY'w=(/`  
 Shell_NotifyIcon(NIM_ADD,&data); P e_mX*0  
 ShowWindow(SW_HIDE); ,0ZkE}<=w  
 bTray=TRUE; \wW'Hk=  
} ~9#nC`%2j  
? U~}uG^  
void CCaptureDlg::DeleteIcon() a o_A %?Ld  
{ lLD-QO}/  
 NOTIFYICONDATA data; " jefB6k9h  
 data.cbSize=sizeof(NOTIFYICONDATA); -cW`qWbd  
 data.hWnd=GetSafeHwnd(); xsjJ8>G  
 data.uID=98; .O9 A[s<  
 Shell_NotifyIcon(NIM_DELETE,&data); 2K/+6t}  
 ShowWindow(SW_SHOW); Wl3jbupu _  
 SetForegroundWindow(); sDV*k4  
 ShowWindow(SW_SHOWNORMAL); A)I4 `3E  
 bTray=FALSE; &mebpEHUG7  
} ppcuMcR{  
[5&zyIi  
void CCaptureDlg::OnChange() wm@ />X  
{ 1S !<D)n  
 RegisterHotkey(); hR;J#w  
} Mv9q-SIc[  
q7id?F}3&  
BOOL CCaptureDlg::RegisterHotkey() I{Pny/d`  
{ /rRQ*m_  
 UpdateData(); b}P5*}$:9"  
 UCHAR mask=0; cp|&&q  
 UCHAR key=0; ![O@{/  
 if(m_bControl) IEb"tsel  
  mask|=4; .:eNL]2%:  
 if(m_bAlt) ]V9z)uz  
  mask|=2; gemjLuf  
 if(m_bShift) RfPRCIo  
  mask|=1; :v/6k  
  key=Key_Table[m_Key.GetCurSel()]; \<ohe w  
 if(bRegistered){  (`0dO8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @d5G\1(%  
  bRegistered=FALSE; z?~W]PWiZ  
 } i*16k dI.  
 cMask=mask; 6`LC(Nv%-n  
 cKey=key; C9oF*{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); |JVeW[C  
 return bRegistered; !oXA^7Th6]  
} #UN(R  
U'i L|JRF  
  四、小结  .*H0{  
^/+0L[R  
  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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