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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: `CK~x =  
  S :HOlJze  
  一、实现方法 {1GJ,['qL  
0'q4=!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: C*`WMP*  
9t! d.}  
#pragma data_seg("shareddata") g/?Vl2W  
HHOOK hHook =NULL; //钩子句柄 Xz]l#w4 Pp  
UINT nHookCount =0; //挂接的程序数目 d[9,J?'OQ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zcpL[@B  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 OqGp|`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~$!,-r  
static int KeyCount =0; J_s`G  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 o<g?*"TRh  
#pragma data_seg() l;F"m+B!$  
b[%@3}E  
  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。 fif;n[<  
iIfiv<(ChM  
  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: gt4GN`-k  
SH*'<  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :@w~*eK~  
cKey,UCHAR cMask) AvL /gt:  
{ O{:{P5  
 BOOL bAdded=FALSE; |$.?(FZYu  
 for(int index=0;index<MAX_KEY;index++){ (6%T~|a  
  if(hCallWnd[index]==0){ IRW0.'Dn  
   hCallWnd[index]=hWnd; =^"Sx??V  
   HotKey[index]=cKey; 0'&C5v'  
   HotKeyMask[index]=cMask; \F _1 C=  
   bAdded=TRUE; \Y#  
   KeyCount++; 0%xktf  
   break; jAQ{H  
  } s>9I#_4]  
 } e\)%<G5  
 return bAdded; ^!['\  
} +\dVC,,=^g  
//删除热键 <Qq {&,Le  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f,YORJ  
{ OPvPP>0*8  
 BOOL bRemoved=FALSE; {/[@uMS_6]  
 for(int index=0;index<MAX_KEY;index++){ T*p7[}#  
  if(hCallWnd[index]==hWnd){ cMK|t;" 3  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =B&|\2`{)  
    hCallWnd[index]=NULL; lyL6w1  
    HotKey[index]=0; o HK   
    HotKeyMask[index]=0; 6Dd>ex!-A  
    bRemoved=TRUE; rpk8  
    KeyCount--; Ust +g4  
    break; 5%'ybh)@   
   } LM<*VhX  
  } l6zAMyau5  
 } % :G78.  
 return bRemoved; dcKpsX  
} 4Q+,_iP  
^;II@n i  
nS#F*)  
  DLL中的钩子函数如下: 1dD%a91  
mbAzn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) IO7z}![V;  
{ lB}?ey   
 BOOL bProcessed=FALSE; U& GPede  
 if(HC_ACTION==nCode) [w](x  
 { mjOxmwo  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 X&Oo[Z  
   switch(wParam) kwi$%  
   {  :F d1k Jm  
    case VK_MENU: mI2Gs) SO  
     MaskBits&=~ALTBIT; `&I6=,YLp  
     break; >MJ %6A>  
    case VK_CONTROL: D[W ` q#W  
     MaskBits&=~CTRLBIT; 9#H0|zL  
     break; l|842N@1  
    case VK_SHIFT: I N@ ~~  
     MaskBits&=~SHIFTBIT; .(&6gB  
     break; Fpo}UQQbc  
    default: //judge the key and send message 6l|L/Z_6  
     break; xb7!!PR  
   } r E1ouz!D  
   for(int index=0;index<MAX_KEY;index++){ /XG7M=A$o  
    if(hCallWnd[index]==NULL) H!NGY]z*  
     continue; i K@RQi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F_u ?.6e]  
    { .aL%}`8l?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :~s"]*y  
     bProcessed=TRUE; kFJ]F |^7  
    } [/ CB1//Y  
   } ?:q"qwt$F  
  } 3{H!B&sb  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,>g( %3C  
   switch(wParam) mj9|q8v{+  
   { &WCVdZK:  
    case VK_MENU: yR F+  
     MaskBits|=ALTBIT; n n[idw  
     break; "% i1zQo&  
    case VK_CONTROL: =M{&g  
     MaskBits|=CTRLBIT; +vFqHfmP  
     break; 7 |Qb}[s  
    case VK_SHIFT: NVVAh5R  
     MaskBits|=SHIFTBIT; | /-# N  
     break; q9zeN:><  
    default: //judge the key and send message P^ -x  
     break; M/[9ZgDc  
   } Q1h v2*/U  
   for(int index=0;index<MAX_KEY;index++){ 4pDZ +}p  
    if(hCallWnd[index]==NULL) &=8ZGjR< }  
     continue; }k1[Fc|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4!glgEE*  
    { I tn?''~;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $YBH;^#  
     bProcessed=TRUE; e?aSM  
    } a(U/70j  
   } d{^K8T3  
  } m[5ed1+  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 E;a9RV|  
   for(int index=0;index<MAX_KEY;index++){ %MfT5*||f  
    if(hCallWnd[index]==NULL) yErvgf  
     continue; k/xNqN(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lVb;,C%K  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); is- {U? -  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <>1*1%m  
   } X<"#=u(  
  } *u<@_Oa  
 } [h :FJ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); H% c{ }F  
} ffQ&1T<  
cW $~86u"C  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Lop=._W  
)&elr,b /y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r(=3yd/G$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |Oaj Jux  
M#>f:_`<  
  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: \RP=Gf  
`!T6#6h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) lO|H:7  
{ vCNYqa)m:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ">RDa<H]  
 { K>$od^f%c  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 KK*"s^ L  
  SaveBmp(); WxLILh  
  return FALSE; V/!8q`lYNJ  
 } I1(, J  
 …… //其它处理及默认处理 {=d\t<p*n  
} cYTX)]^u  
ex2*oqAdX  
m; LeaD}0  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 iyhB;s5Rgw  
M:(k7a+[^  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 F;&'C$%  
0)qLW& w  
  二、编程步骤 s.I=H^ T  
{/ _.]Vh  
  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"; UkL'h&J~  
IV:Knh+ ?  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; I|$_[Sw  
;z7iUke0%  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; %P9Zx!i>  
mv xg|<  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; .|{*.YE  
}qXi;u))  
  5、 添加代码,编译运行程序。 y#Ch /Jg?|  
hD l+  
三、程序代码 {N;XjV1x  
VxfFk4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL '89D62\89  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) gy<pN?Mw  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9!FV. yp%F  
#if _MSC_VER > 1000 f5/ba9n I  
#pragma once W~Mj6c~S"  
#endif // _MSC_VER > 1000 s6).?oE  
#ifndef __AFXWIN_H__ w];t]q|  
#error include 'stdafx.h' before including this file for PCH mrd(\&EhA  
#endif ( {zp$P}  
#include "resource.h" // main symbols )WEyB~'o  
class CHookApp : public CWinApp #ZGWU_l}  
{ m(Bv}9  
 public: v?h#Ym3e<  
  CHookApp(); F+Lq  
  // Overrides K#F~$k|1B  
  // ClassWizard generated virtual function overrides mKnkHGM  
  //{{AFX_VIRTUAL(CHookApp) WFN5&7$W  
 public: [N#2uo  
  virtual BOOL InitInstance(); 7,jh44(\=  
  virtual int ExitInstance(); 6z=:x+m  
  //}}AFX_VIRTUAL $+[HJ{  
  //{{AFX_MSG(CHookApp) 0R*  
  // NOTE - the ClassWizard will add and remove member functions here. UwdcU^xt9  
  // DO NOT EDIT what you see in these blocks of generated code ! NY1olnI  
  //}}AFX_MSG >48zRi\N  
  DECLARE_MESSAGE_MAP() Fv5@-&y$W  
}; xp>r a2A  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); kfA%%A  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  }e9:2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }L@!TWR-Qu  
BOOL InitHotkey(); 0V`0="rQ  
BOOL UnInit(); Y@^M U->+  
#endif HK5\i@G+<  
&HZ"<y{j  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. x8gUP  
#include "stdafx.h" ep,kImT  
#include "hook.h" aLuxCobV  
#include <windowsx.h> A'6>"=ziP  
#ifdef _DEBUG /[t]m,p$yq  
#define new DEBUG_NEW R^fVw Dl\  
#undef THIS_FILE i v&:X3iB  
static char THIS_FILE[] = __FILE__; E@P8-x'i  
#endif 6#.z:_  
#define MAX_KEY 100 q}tLOVu1  
#define CTRLBIT 0x04 JyYg)f  
#define ALTBIT 0x02 f(7 /  
#define SHIFTBIT 0x01 HDA!;&NRS  
#pragma data_seg("shareddata") N~g'Z `  
HHOOK hHook =NULL; US0)^TKrj  
UINT nHookCount =0; [|xHXcW  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &D>e>]E|P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT zpiqJEf|'"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey L5of(gQ5]  
static int KeyCount =0; W<u63P  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift eB<R@a|?S  
#pragma data_seg() XQ%*U=)s  
HINSTANCE hins; 9]Uvy|  
void VerifyWindow(); \O^b|0zc  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) $^y6>@~  
//{{AFX_MSG_MAP(CHookApp) H)G ^ Y1  
// NOTE - the ClassWizard will add and remove mapping macros here. 6#K1LY5}  
// DO NOT EDIT what you see in these blocks of generated code! Y)g7 E"  
//}}AFX_MSG_MAP `\(Fax  
END_MESSAGE_MAP() g(>;Z@Y  
;Q:^|Fw!F  
CHookApp::CHookApp() q[ ] "`?  
{ qeb:n$  
 // TODO: add construction code here,  }aRV)F  
 // Place all significant initialization in InitInstance b`PAOQ  
} /J<?2T9G  
KaZ*HPe(  
CHookApp theApp; NELQo#kjZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) d /+sR@\  
{ ,Si\ky7L  
 BOOL bProcessed=FALSE; ~*ZB2  
 if(HC_ACTION==nCode) ,i;kAy)  
 { L/1?PM  
  if((lParam&0xc0000000)==0xc0000000){// Key up nG1 mx/w  
   switch(wParam) 'bN\bbR  
   { ;m,lS_[c  
    case VK_MENU: 7,d^?.~S  
     MaskBits&=~ALTBIT; cwlXb!S$  
     break; O{,Uge2n,  
    case VK_CONTROL: _~d C>`K  
     MaskBits&=~CTRLBIT; Y [0 S  
     break; BBm.;=8@ ^  
    case VK_SHIFT: <fCgU&  
     MaskBits&=~SHIFTBIT; 3x#=@i  
     break; VTa?y  
    default: //judge the key and send message qN1(mxa.?  
     break; vHcB ^Z  
   } S&Q1Ky^  
   for(int index=0;index<MAX_KEY;index++){ [#fXmW>N/  
    if(hCallWnd[index]==NULL) KM*sLC#  
     continue; 4r\Sbh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KwlN  
    { ]0GOSh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aEW Z*y  
     bProcessed=TRUE; 2[}^ zTtA  
    } 9TjAEeU  
   } :+|b7fF  
  } :@I?JSi  
  else if((lParam&0xc000ffff)==1){ //Key down mR,p?[P  
   switch(wParam) IvTtQq  
   { /tikLJ  
    case VK_MENU: |xG|HJm,  
     MaskBits|=ALTBIT; a.v$+}+.[,  
     break; GrGgR7eC#P  
    case VK_CONTROL: "Q`{+|'=E  
     MaskBits|=CTRLBIT; wO@b=1j  
     break; rteViq+|.  
    case VK_SHIFT: N{IY \/;\  
     MaskBits|=SHIFTBIT; KFor~A# D  
     break; e!URj\*  
    default: //judge the key and send message X's-i!  
     break; VHsuC$3W  
   } c2Ua!p(c  
   for(int index=0;index<MAX_KEY;index++) I1=YSi;A  
   { >G92k76G  
    if(hCallWnd[index]==NULL) m0t 5oO  
     continue; WW2VW-Hk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 4f ~CG r  
    { 46o3F"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [-f0s;F1%  
     bProcessed=TRUE; MeW8aL r  
    } m=k(6  
   } !s/ij' T  
  } .r)WDR  
  if(!bProcessed){ f(=yC} si  
   for(int index=0;index<MAX_KEY;index++){ O$J'BnPpw  
    if(hCallWnd[index]==NULL) lY[>}L*H8  
     continue; yL^1s\<ddW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0|9(oP/:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ELeR5xT  
   } <1.].A@b*  
  } ])!|b2:s3  
 } u`$,S& Er  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %?J\P@  
} @Ytsb!!  
k ~lj:7g~  
BOOL InitHotkey() G'q7@d {'  
{ d}3<nz,  
 if(hHook!=NULL){ I&3L1rl3{*  
  nHookCount++; F IDNhu  
  return TRUE; l]Jk  }.  
 } m1a0uEA G  
 else fz31di9$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Jg/l<4,K,  
  if(hHook!=NULL) Z7"8dlb  
   nHookCount++; #M&rmKv)g  
  return (hHook!=NULL); UTc$zc7  
} ca*USM  
BOOL UnInit() ndT:,"s  
{ 6* cm  
 if(nHookCount>1){ /xJ,nwp7  
  nHookCount--; d*khda;Vj  
  return TRUE; z[b,:G  
 } %+|k>?&z7  
 BOOL unhooked = UnhookWindowsHookEx(hHook); fu}NH \{  
 if(unhooked==TRUE){ @riCR<fF  
  nHookCount=0; .*:SZ3v  
  hHook=NULL; 9Gfm?.O5  
 } ?`_US7.@  
 return unhooked; X ~%I(?OX  
} @y[Zr6\z  
Yr-a8aSTE5  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @xH|(  
{ FVMR9~&+  
 BOOL bAdded=FALSE; 8)ZWR3)+W  
 for(int index=0;index<MAX_KEY;index++){ ag]b]K  
  if(hCallWnd[index]==0){ e]!Vxn3  
   hCallWnd[index]=hWnd; QbP W_)N  
   HotKey[index]=cKey; w-FZ`OA`D  
   HotKeyMask[index]=cMask; 9*GwW&M%1_  
   bAdded=TRUE; B]ul~FX  
   KeyCount++; @/l{  
   break; J:dF^3Y  
  } /p~"?9b[ i  
 } \)eHf 7H  
 return bAdded; ~0w7E0DE[  
} Gg|'T}0X  
4*&x% ~*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) iN8?~T}w  
{ g4<%t,(88E  
 BOOL bRemoved=FALSE; 'C+z  
 for(int index=0;index<MAX_KEY;index++){ LG'JQGl5  
  if(hCallWnd[index]==hWnd){ l " pCxA  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vP^]Y.6  
    hCallWnd[index]=NULL; d#Sc4xuf  
    HotKey[index]=0; DalQ.   
    HotKeyMask[index]=0; O*d&H;;  
    bRemoved=TRUE; ~QFD ^SoK  
    KeyCount--; it=L_zu}  
    break; h?j;*|o-  
   } A^q= :ofQ  
  } Bwjd/id q  
 } qF`;xa%,}  
 return bRemoved; !CtY.Lp  
} Ziu f<X{  
\=Af AO@  
void VerifyWindow() zT#36+_?  
{ 7{RI`Er`  
 for(int i=0;i<MAX_KEY;i++){ Ev0GAc1  
  if(hCallWnd!=NULL){ p^Ca-+R3  
   if(!IsWindow(hCallWnd)){ #bUWF|zfT  
    hCallWnd=NULL; ZLyJ  
    HotKey=0; =rl/ l8|P  
    HotKeyMask=0; Re5m  
    KeyCount--; }oYR.UH  
   } N[^%|  
  } 9Re605x Q6  
 } d8<Lk9H9R  
} J_}&Btb)e  
Xx[ L K  
BOOL CHookApp::InitInstance() p|,K2^?Y  
{ 7loCb4Hv  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); BnvUPDT&  
 hins=AfxGetInstanceHandle(); VD/Wl2DK  
 InitHotkey(); 96]lI3 c  
 return CWinApp::InitInstance(); H. uflO  
} hghtF  
B, xrZs  
int CHookApp::ExitInstance() ?u"(^93f  
{ 7IBm(#  
 VerifyWindow(); l~Kn-S{  
 UnInit(); ]w]Swt2n  
 return CWinApp::ExitInstance(); , M/-lW  
} pWSYbN+d  
8H./@~_ =  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %=/Y~ml?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vNL f)B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8V_ ]}W  
#if _MSC_VER > 1000 fpM 4q  
#pragma once BS;rit:  
#endif // _MSC_VER > 1000 tirw{[X0n  
[T"oqO4%]  
class CCaptureDlg : public CDialog V:6#IL  
{ -Hh$3U v  
 // Construction KD$P\(5#  
 public: b;]'Bo0K  
  BOOL bTray; Q}^ n  
  BOOL bRegistered; \-GV8A2:k  
  BOOL RegisterHotkey(); (*&6XTV(  
  UCHAR cKey; -4,qAnuMx  
  UCHAR cMask; nuw90=qj!]  
  void DeleteIcon(); q\O'r[&V  
  void AddIcon(); eG|e1tK+  
  UINT nCount; -yg9ug  
  void SaveBmp(); _E)xR  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor n]ar\f  
  // Dialog Data d`StBXG!  
  //{{AFX_DATA(CCaptureDlg) R" 5/  
  enum { IDD = IDD_CAPTURE_DIALOG }; ~Cks)mJs  
  CComboBox m_Key; yZxgUF&`  
  BOOL m_bControl; wz.Il-sm  
  BOOL m_bAlt; PdMx6 Ab  
  BOOL m_bShift; Mb\~WUWI  
  CString m_Path; &w2.b:HF  
  CString m_Number; S#jH2fRo  
  //}}AFX_DATA ;PaB5TT(  
  // ClassWizard generated virtual function overrides TmKO/N@}  
  //{{AFX_VIRTUAL(CCaptureDlg) BS*cG>T  
 public: #Vv*2Mc  
  virtual BOOL PreTranslateMessage(MSG* pMsg); qw%4j9}  
 protected: EM vV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LAw X9q`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); hz Vpv,|G  
  //}}AFX_VIRTUAL PHDKx+$  
  // Implementation s[nOB0  
 protected: 1:My8  
  HICON m_hIcon; cIl^5eE^Pq  
  // Generated message map functions Y4@~NCU/  
  //{{AFX_MSG(CCaptureDlg) F5:*;E;$  
  virtual BOOL OnInitDialog(); :J(a;/~ip  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); U(W#H|  
  afx_msg void OnPaint(); J2aA"BhdC"  
  afx_msg HCURSOR OnQueryDragIcon(); n.$<D[@  
  virtual void OnCancel(); XS9k&~)*  
  afx_msg void OnAbout(); GJ%It .  
  afx_msg void OnBrowse(); W}Nd3  
  afx_msg void OnChange(); 2r?g|< :  
 //}}AFX_MSG q5lRc=.b[  
 DECLARE_MESSAGE_MAP() Cd7 j G  
}; Se"\PxBR  
#endif YH':cze  
!\ y_ik  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C1p |.L?m  
#include "stdafx.h" v&H&+:<  
#include "Capture.h" x18ei@c  
#include "CaptureDlg.h" b44H2A .  
#include <windowsx.h> >P\T nb"Q\  
#pragma comment(lib,"hook.lib") FX}<F0([?  
#ifdef _DEBUG '(2G qX!  
#define new DEBUG_NEW |+!Jr_ By  
#undef THIS_FILE 4DuZF -y  
static char THIS_FILE[] = __FILE__; K W04  
#endif p*Q"<@n  
#define IDM_SHELL WM_USER+1 @#VxjXW^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M*t@Q|$:  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JB+pd_>5  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; bn<&Xe  
class CAboutDlg : public CDialog .vG6\U7  
{ vm8QKPy  
 public: bGK&W;Myk  
  CAboutDlg(); T%P 0M*  
  // Dialog Data w$Dp m.0(  
  //{{AFX_DATA(CAboutDlg)  V}8J&(\  
  enum { IDD = IDD_ABOUTBOX }; WNm,r>6m  
  //}}AFX_DATA S_?}H  
  // ClassWizard generated virtual function overrides rZJp>Q)s  
  //{{AFX_VIRTUAL(CAboutDlg) ;-*4 (3lu  
 protected: JFYeOmR+l  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H@G7oK  
  //}}AFX_VIRTUAL O;H/15j:sK  
  // Implementation T]CvfvO5  
 protected: yaR|d3ef?4  
  //{{AFX_MSG(CAboutDlg) ik&loM_  
  //}}AFX_MSG ,Oxdqxu7  
  DECLARE_MESSAGE_MAP() @Z3b^G[  
}; ]NTHit^EX  
),M8W15  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) H D=WHT&  
{ JG/sKOlA  
 //{{AFX_DATA_INIT(CAboutDlg) <LBMth  
 //}}AFX_DATA_INIT !m_'<=)B4~  
} z w5EaY  
vf5[x!4  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Em4TEv  
{ xFg=Tyq:  
 CDialog::DoDataExchange(pDX); L?al2aopF  
 //{{AFX_DATA_MAP(CAboutDlg) [c>X Q  
 //}}AFX_DATA_MAP Onot<}K  
} ShCAkaj_  
yD(/y"P,9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3kKXzIh  
 //{{AFX_MSG_MAP(CAboutDlg) HO' ELiZ_q  
 // No message handlers :dLS+cTC  
 //}}AFX_MSG_MAP m{b(^K9}  
END_MESSAGE_MAP() uO"@YX/  
i}HF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?\c*DNM'  
: CDialog(CCaptureDlg::IDD, pParent) .@B \&U7  
{ u;=("S{"0  
 //{{AFX_DATA_INIT(CCaptureDlg) 6 _73  
  m_bControl = FALSE; ^GRd;v=-@  
  m_bAlt = FALSE; uX.Aq@j  
  m_bShift = FALSE; {Ziq~{W_  
  m_Path = _T("c:\\"); X^aujK^@  
  m_Number = _T("0 picture captured."); .Ta$@sPh}  
  nCount=0; zaoZCyJT%  
  bRegistered=FALSE; [f O]oTh  
  bTray=FALSE;  #lJF$  
 //}}AFX_DATA_INIT P_b00",S  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 g1&GX(4[  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); w5~<jw%>  
} P6IhpB59  
YdeSJ(:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4<lZ;M"  
{ 1%1-j  
 CDialog::DoDataExchange(pDX); 3FNj~=N  
 //{{AFX_DATA_MAP(CCaptureDlg) &<!I]:Y  
  DDX_Control(pDX, IDC_KEY, m_Key); >TL0hBaaR  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); VaQ}XM  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *RuUf  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); :=~([oSNW"  
  DDX_Text(pDX, IDC_PATH, m_Path); r-'j#|^tz  
  DDX_Text(pDX, IDC_NUMBER, m_Number); R \`,Q'3  
 //}}AFX_DATA_MAP \UNw43EL  
} Dm4\Rld{  
8dL(cC  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !sR`]0  
//{{AFX_MSG_MAP(CCaptureDlg) E; RI.6y  
 ON_WM_SYSCOMMAND() {a(YV\^y|H  
 ON_WM_PAINT() D, 3x:nK  
 ON_WM_QUERYDRAGICON() /D~z}\k  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $9hOWti  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T[<9Ty'^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8.9S91]=  
//}}AFX_MSG_MAP "J[Crm  
END_MESSAGE_MAP() xY_/CR[,  
rJ<v1Yb  
BOOL CCaptureDlg::OnInitDialog() y YF80mnJz  
{ ;PLby]=O  
 CDialog::OnInitDialog(); -ud!j  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8c~b7F \  
 ASSERT(IDM_ABOUTBOX < 0xF000); ~G"6^C:x  
 CMenu* pSysMenu = GetSystemMenu(FALSE); E-! `6  
 if (pSysMenu != NULL) 6oJ~Jdn'  
 { ZEApE+m  
  CString strAboutMenu; M+nz~,![  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >TtkG|/U-T  
  if (!strAboutMenu.IsEmpty()) iLS' 47  
  { *!.'1J:YJ(  
   pSysMenu->AppendMenu(MF_SEPARATOR); x:?1fvVR  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); gy*N)iv%  
  } (( t8  
 } t@!oc"z}@  
 SetIcon(m_hIcon, TRUE); // Set big icon 9nd'"$  
 SetIcon(m_hIcon, FALSE); // Set small icon z?E:s.4F  
 m_Key.SetCurSel(0); ux-Fvwoh  
 RegisterHotkey(); r[~K m5  
 CMenu* pMenu=GetSystemMenu(FALSE); %} \@Wk~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); D+"5R5J",  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /4=O^;   
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O{%y `|m  
 return TRUE; // return TRUE unless you set the focus to a control dq|z;,`  
} .\1XR  
SJ+.i u/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Fdvex$r&  
{ <4(rY9   
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 5GpR N  
 { ]A!Gr(FHQ  
  CAboutDlg dlgAbout; |yQ3H)qB#  
  dlgAbout.DoModal(); #x "pG  
 } c: #1Aym  
 else *4+;E y  
 { BU])@~$  
  CDialog::OnSysCommand(nID, lParam); \_BaV0<  
 } h4.ZR={E  
} ?M\3n5;  
BIX%Bu0'f  
void CCaptureDlg::OnPaint() )e{~x u  
{ .eJ4F-V  
 if (IsIconic()) Vh'H5v^  
 { +hK Qha!*  
  CPaintDC dc(this); // device context for painting +B*ygv:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WvN5IHo 8i  
  // Center icon in client rectangle WKmGw^  
  int cxIcon = GetSystemMetrics(SM_CXICON); oIbd+6>f  
  int cyIcon = GetSystemMetrics(SM_CYICON); PVV\@  
  CRect rect; i' N  
  GetClientRect(&rect); &AlVJEI+  
  int x = (rect.Width() - cxIcon + 1) / 2; ,D~C40f  
  int y = (rect.Height() - cyIcon + 1) / 2; \ Fc"Q@.u  
  // Draw the icon VN;Sz,1Z  
  dc.DrawIcon(x, y, m_hIcon); v>0xHQD*<M  
 } TX8,+s+  
 else @\[&_DZ  
 { ~f ){`ZJc  
  CDialog::OnPaint(); Ok O;V6`  
 } HtS:'~DYo  
} 1LcQ*d  
spn1Ji  
HCURSOR CCaptureDlg::OnQueryDragIcon() I[&z#foN=w  
{ l<^#@SH  
 return (HCURSOR) m_hIcon; .F}ZP0THnZ  
} [O(78n$$  
}&;0:hw%  
void CCaptureDlg::OnCancel() >*Y~I0>  
{ ,?i#NN5p  
 if(bTray) e 0!a &w  
  DeleteIcon(); tQ] R@i  
  CDialog::OnCancel(); UAH} ])U  
} `@=}5 9+|  
DA[-( s  
void CCaptureDlg::OnAbout() -zMXc"'C^k  
{ G4AX8@;U  
 CAboutDlg dlg; 3P'.)=}  
 dlg.DoModal(); 1<fEz  
} '{U56^b]  
YceiP,!4?v  
void CCaptureDlg::OnBrowse() ZK_IK)g  
{ g8}/Ln*W'  
 CString str; vZ$uD,@;.  
 BROWSEINFO bi; ugucq},[  
 char name[MAX_PATH]; )Q(tryiSi  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Uj6R?E{Jt  
 bi.hwndOwner=GetSafeHwnd(); z26zl[.  
 bi.pszDisplayName=name; B 2&fvv?  
 bi.lpszTitle="Select folder"; Wu:vO2aw8  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ZYrd;9zB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); AUxLch+"5K  
 if(idl==NULL) *F~"4g  
  return; nM)]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ){R_o5  
 str.ReleaseBuffer(); a*74FVZo.;  
 m_Path=str; $7M64K{  
 if(str.GetAt(str.GetLength()-1)!='\\') (!{_O_&  
  m_Path+="\\"; /gXli)  
 UpdateData(FALSE); Yq<D(F#qx  
} :]e:-JbT4z  
OFCkQEG=y>  
void CCaptureDlg::SaveBmp() QQ1+uY  
{ A3yVT8  
 CDC dc; A$fd6+{  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 6$ @Pk<w  
 CBitmap bm; &=t$ AIu  
 int Width=GetSystemMetrics(SM_CXSCREEN); BI,K?D&W-  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7f[nNng  
 bm.CreateCompatibleBitmap(&dc,Width,Height); b"x;i\Z0%  
 CDC tdc; E{ Y0TZ+  
 tdc.CreateCompatibleDC(&dc); KdYT5VUM/  
 CBitmap*pOld=tdc.SelectObject(&bm); )d0&iE`@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); x\;`x$3t  
 tdc.SelectObject(pOld); d<(1^Rto  
 BITMAP btm; Yy>%dL  
 bm.GetBitmap(&btm); JL2IVENWc  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; @5Ril9J[b  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Mz+|~'R  
 BITMAPINFOHEADER bih; rm(<?w%'?  
 bih.biBitCount=btm.bmBitsPixel; `H ^Nc\P#  
 bih.biClrImportant=0; GAtK1%nPD  
 bih.biClrUsed=0; :#c?`>uV  
 bih.biCompression=0; ,LWM}L  
 bih.biHeight=btm.bmHeight; QRw3 06  
 bih.biPlanes=1; E9%xSMS8@  
 bih.biSize=sizeof(BITMAPINFOHEADER); {Am\%v\  
 bih.biSizeImage=size; "op1xto  
 bih.biWidth=btm.bmWidth; u=#LY$  
 bih.biXPelsPerMeter=0; (= uwx#  
 bih.biYPelsPerMeter=0; ?GB($D=Y'&  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); cV)fe`Gg  
 static int filecount=0; E)H8jBm6w  
 CString name; E=sBcb/v  
 name.Format("pict%04d.bmp",filecount++); 9BNAj-Xa  
 name=m_Path+name; Nr3td`;  
 BITMAPFILEHEADER bfh; %v : a  
 bfh.bfReserved1=bfh.bfReserved2=0; : gv[X  
 bfh.bfType=((WORD)('M'<< 8)|'B'); aW4tJN%!  
 bfh.bfSize=54+size; o(C({]UO/  
 bfh.bfOffBits=54; -(Taj[;[  
 CFile bf; i LK8Wnrq  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ l yO_rZT  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); B2WPjhzD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zZki9P   
  bf.WriteHuge(lpData,size); hH )jX`Ta  
  bf.Close(); )0fQ(3oOg  
  nCount++; peR=J7  
 } .Eh~$wm  
 GlobalFreePtr(lpData); 1Qhx$If~  
 if(nCount==1) JR'Q Th:z  
  m_Number.Format("%d picture captured.",nCount); \TC&/'7}  
 else XV). cW|.a  
  m_Number.Format("%d pictures captured.",nCount); ;QREwT~H  
  UpdateData(FALSE); zu^?9k  
} ?ti7iBz?  
}9<aX Y,  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) eV1O#FLbi  
{ H:d{Sru  
 if(pMsg -> message == WM_KEYDOWN) 4#;rv$ {  
 { T!(I\wz;Bo  
  if(pMsg -> wParam == VK_ESCAPE) RyIr_:&-~  
   return TRUE; h_* =_2|}  
  if(pMsg -> wParam == VK_RETURN) V|#B=W  
   return TRUE; u0w2v+  
 } 7$,["cJX  
 return CDialog::PreTranslateMessage(pMsg); L>xcgV7  
} VGWqy4m  
,'={/)c<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~;wSe[  
{ $-M1<?5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ nU)}!` E  
  SaveBmp(); NTs< ;ED  
  return FALSE; WI[6 l6  
} 92+({ fg W  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %jqBYn0q'  
 CMenu pop; ?n\~&n'C  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @<W"$_ r-  
 CMenu*pMenu=pop.GetSubMenu(0); K]N^6ome  
 pMenu->SetDefaultItem(ID_EXITICON); &=X1kQG  
 CPoint pt; QbxjfW"/+  
 GetCursorPos(&pt); (@uQ>dR:  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); hY-;Wfg  
 if(id==ID_EXITICON) |KplbU0iC  
  DeleteIcon(); iWGgt]RJ  
 else if(id==ID_EXIT) 4kxy7] W  
  OnCancel(); :NA cad  
 return FALSE; (gl CTF9v  
} C.%iQx`   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); W(~G^Xu  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) tojJQ6;J  
 AddIcon(); ]$y"|xqR  
 return res; >F Z6\  
} 0pBlmPafY  
j=PQoEtU'<  
void CCaptureDlg::AddIcon() gigDrf}  
{ >(`|oD`,Y  
 NOTIFYICONDATA data; HP*x?|4  
 data.cbSize=sizeof(NOTIFYICONDATA); jR }h3!  
 CString tip; wb"Jj  
 tip.LoadString(IDS_ICONTIP); j%]i#iqF  
 data.hIcon=GetIcon(0); s:jr/ j!  
 data.hWnd=GetSafeHwnd(); !i.`m-J*  
 strcpy(data.szTip,tip); = Ky1v$<  
 data.uCallbackMessage=IDM_SHELL; P.&,nFIg3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !COaPrg  
 data.uID=98; s/`4]B;2U  
 Shell_NotifyIcon(NIM_ADD,&data); k-b_ <Tbo|  
 ShowWindow(SW_HIDE); "aB]?4  
 bTray=TRUE; yr[iAi"  
} kx]f`b  
0Q]x[;!k  
void CCaptureDlg::DeleteIcon() - Kj$A@~x  
{ ,UH`l./3DX  
 NOTIFYICONDATA data; o=w& &B  
 data.cbSize=sizeof(NOTIFYICONDATA); xfos>|0N  
 data.hWnd=GetSafeHwnd();  5t:4%  
 data.uID=98; pc^(@eD  
 Shell_NotifyIcon(NIM_DELETE,&data); Rj^bZ%t  
 ShowWindow(SW_SHOW); |~8iNcIS  
 SetForegroundWindow(); ~Jp\'P7*  
 ShowWindow(SW_SHOWNORMAL); 8 E.u3eS  
 bTray=FALSE; 7I(Sa?D:  
} sJt&`kZ  
31Zl"-<#-  
void CCaptureDlg::OnChange() S%mN6b~{  
{ +]`MdOu  
 RegisterHotkey(); _BHb0zeot  
} 9.#\GI ;  
; =F^G?p^  
BOOL CCaptureDlg::RegisterHotkey() 5W 5\  *L  
{ ^0~?3t5  
 UpdateData(); V8[woJ5x  
 UCHAR mask=0; lJ R",_  
 UCHAR key=0; CuT[V?^iD  
 if(m_bControl) UKMrR9[x*  
  mask|=4; !_l W#feR  
 if(m_bAlt)  ]c[80F-  
  mask|=2; 'ZT E"KT  
 if(m_bShift) .~ZNlI {K  
  mask|=1; Fg5>CppH  
  key=Key_Table[m_Key.GetCurSel()]; {B\ar+9>  
 if(bRegistered){ )q&uvfQ1(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?Xh=rx_  
  bRegistered=FALSE; p`33`25  
 } S7E:&E&  
 cMask=mask; t+q:8HNh  
 cKey=key; Q4CxtY  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); o LuGW5wzj  
 return bRegistered; *1Nz VV  
} .OXvv _?<  
C1r]kF  
  四、小结 v(h   
E"pq ZP =  
  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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