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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: X:8=jHkz  
  EW2e k^  
  一、实现方法 e;rs!I !Yw  
y*Ex5N~JC  
  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: PK3T@Qv89  
+|#sF,,X4g  
#pragma data_seg("shareddata") E6)FYz7x  
HHOOK hHook =NULL; //钩子句柄 Ku,Efr  
UINT nHookCount =0; //挂接的程序数目 Y;&Cmi  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ks7s2vK^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /8W}o/,s5  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey dP)8T  
static int KeyCount =0; +qsdA#2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 uT;Qo{G^  
#pragma data_seg() 1+#Vj#  
 PJk Mn  
  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。 -iH/~a  
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  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: VJ_E]}H  
rK=[&k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rX;(48Y  
cKey,UCHAR cMask) Y 3KCIL9  
{ y0(k7D|\  
 BOOL bAdded=FALSE; d9Rj-e1x  
 for(int index=0;index<MAX_KEY;index++){ c$uV8_V  
  if(hCallWnd[index]==0){ %K ]u"  
   hCallWnd[index]=hWnd; <YJU?G:@  
   HotKey[index]=cKey; IHxX:a/iv  
   HotKeyMask[index]=cMask; 9SAyU%mS:  
   bAdded=TRUE; X*S|aNaLWW  
   KeyCount++; C8&)-v|  
   break; !EpP-bq'*  
  } Grjm9tbX}  
 } d8]6<\g  
 return bAdded; 6"_FjS3Sl  
} o`RTvG Xk  
//删除热键 vj{h*~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ap}:^k5{  
{ []LNNO],X  
 BOOL bRemoved=FALSE; *"9b?`E  
 for(int index=0;index<MAX_KEY;index++){ ?`FI!3j  
  if(hCallWnd[index]==hWnd){ NRoi` IIj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d54>nycU~N  
    hCallWnd[index]=NULL; .P,\69g~A  
    HotKey[index]=0; W4>8  
    HotKeyMask[index]=0; GVEjB;  
    bRemoved=TRUE; I[[rVts  
    KeyCount--; ,T&B.'cq  
    break; ?]3`WJOj  
   } ,qvz:a  
  } gvy%`SSW  
 } i$og v2J  
 return bRemoved; 5[/ *UtB  
} Y=}b/[s6;  
ZB ~D_S  
<7TpC@"/g  
  DLL中的钩子函数如下: pOH_ CXw  
cp.)K!$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <'GI<Hc  
{ u :m]-'  
 BOOL bProcessed=FALSE; N@j|I* y|  
 if(HC_ACTION==nCode) G e~&Ble  
 {  NsJUruN  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 _Dk;U*2  
   switch(wParam) zD)2af  
   {  7J>n;8{%?  
    case VK_MENU: kTC6fNj[  
     MaskBits&=~ALTBIT; dAAE2}e  
     break; W"wP%  
    case VK_CONTROL: Keof{>V=CA  
     MaskBits&=~CTRLBIT; v5<Ext rV  
     break; t[an,3  
    case VK_SHIFT: ^$x^JM ]/  
     MaskBits&=~SHIFTBIT; umls=iz  
     break; _/MKU!\l  
    default: //judge the key and send message `7N[rs9|S  
     break; C@Wm+E~;8  
   } Q>Q$BCD5  
   for(int index=0;index<MAX_KEY;index++){ >Y{.)QS  
    if(hCallWnd[index]==NULL) IS!B$  
     continue; T+2?u.{I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =AR'Pad  
    { $f C=v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'M G)noN5  
     bProcessed=TRUE; :&TOQ<vM  
    } k# &y  
   } >_&+gn${  
  } L"('gc!W  
  else if((lParam&0xc000ffff)==1){ //有键按下 gL}K84T$S  
   switch(wParam) LClPAbr  
   { ?}lCS7&  
    case VK_MENU: ]qv/+~Qs>  
     MaskBits|=ALTBIT; ?,s{M^sj^  
     break; &OuyjW4  
    case VK_CONTROL: uMqo)J@s  
     MaskBits|=CTRLBIT; jRq>Sz{8  
     break; "=/XIM.  
    case VK_SHIFT: '-ACNgNn  
     MaskBits|=SHIFTBIT; dks0  
     break; J-I7K !B  
    default: //judge the key and send message L'[ '7  
     break; dmE-W S  
   } W:0@m^r  
   for(int index=0;index<MAX_KEY;index++){ Txw,B2e)>  
    if(hCallWnd[index]==NULL) Rmd;u g9  
     continue; *M KVm)Iv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {d7KJmN  
    { 0HG*KW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); e@X~F6nP  
     bProcessed=TRUE; O'5(L9,  
    } E[_Z%zd^  
   } <pPI:D@G  
  } P^1rNB  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r*,]=M W  
   for(int index=0;index<MAX_KEY;index++){ `CHgTkv  
    if(hCallWnd[index]==NULL) 1S_ KX.  
     continue; lYy0   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]bS\*q0Zf(  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); nC`=quM9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 }25{"R}K  
   } %oN^1a'&)  
  } {OQ sGyR?  
 } q .?D{[2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #UGbSOoCtn  
} LY^BkH'  
, :kCt=4%  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: [& hdyLt  
;l?>+m@H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -G*u2i_*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <vbk@d  
gw5CU)r4$  
  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: S9xC> |<  
r{Fu|aoa;5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6|9];)  
{ iOD9lR`s  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) wePMBL1P*  
 { w|$;$a7)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 JXvHsCd?  
  SaveBmp(); &=s{ +0  
  return FALSE; DpTQPu9  
 } TmUn/  
 …… //其它处理及默认处理 s]=kD  
} r9u*c  
o]k[l ;  
-4HI9Czts  
  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。 W;0_@!?mr}  
U;{VL!  
  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。 I:Z38xz-[  
j&#p&`B  
  二、编程步骤 g=Qj9Z  
'9RHwKu&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"; K,^b=_]  
I@x*>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; tM !1oWH  
I *}:C  
  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; w#"c5w~  
[% 3{mAd  
  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; [;tbNVZK  
| pJ.73  
  5、 添加代码,编译运行程序。 [.6uw=;o  
jPbL3"0A&  
三、程序代码 U8.DPRa  
5@Rf]'1B0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0ED(e1K#B  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f#5mX&j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ sg9ZYWcL  
#if _MSC_VER > 1000 s[Njk@y,  
#pragma once J)o~FC]b*  
#endif // _MSC_VER > 1000 uRUysLIw  
#ifndef __AFXWIN_H__ qKWkgackP  
#error include 'stdafx.h' before including this file for PCH {zg}KiNDZd  
#endif ;,9|;)U?u  
#include "resource.h" // main symbols 0WYVt"|;}c  
class CHookApp : public CWinApp _YbHnb  
{ hQX|wWh  
 public: /~AajLxu3W  
  CHookApp(); OZ7MpQ  
  // Overrides U[Z1@2zLx  
  // ClassWizard generated virtual function overrides #<l ;YT8  
  //{{AFX_VIRTUAL(CHookApp) @n})oAC,  
 public: d)q{s(<;  
  virtual BOOL InitInstance(); b}k`'++2,  
  virtual int ExitInstance(); ?2.< y_1  
  //}}AFX_VIRTUAL 3pl.<;9r  
  //{{AFX_MSG(CHookApp) ^8We}bs-c  
  // NOTE - the ClassWizard will add and remove member functions here. Z;Tjjws  
  // DO NOT EDIT what you see in these blocks of generated code ! 4J_18.JHP  
  //}}AFX_MSG h`jtmhoz  
  DECLARE_MESSAGE_MAP() ,wnF]K 2D0  
}; Ak|j J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 3B;B#0g50  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |s s_<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QvqX3FU  
BOOL InitHotkey(); v`no dI  
BOOL UnInit(); iiO4.@nT  
#endif "9R3S[  
tohYwXN  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. QDSB <0j  
#include "stdafx.h" 2uqdx'^"  
#include "hook.h" H%sbf& gi  
#include <windowsx.h> &o)j@5Y?  
#ifdef _DEBUG g3"`b)M  
#define new DEBUG_NEW 80 p7+W2m  
#undef THIS_FILE h!MZ 6}zb)  
static char THIS_FILE[] = __FILE__; a}%>i~v<  
#endif x/5%a{~j2  
#define MAX_KEY 100 j63w(Jv/  
#define CTRLBIT 0x04 <51(q_f  
#define ALTBIT 0x02 V =1Y&y  
#define SHIFTBIT 0x01 et)A$'Q  
#pragma data_seg("shareddata") 4. R >mN[  
HHOOK hHook =NULL; `) K1[&  
UINT nHookCount =0; LVO`+:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -w^E~J0*L  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT wYNh0QlBH  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ].` i`.T  
static int KeyCount =0; N "FQMxqm  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z?1.Y7Npr  
#pragma data_seg() -YRF^72+  
HINSTANCE hins; C3WqUf<8`{  
void VerifyWindow(); kjjO<x?&*  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) IDwneFO  
//{{AFX_MSG_MAP(CHookApp) QiB:K Pz[  
// NOTE - the ClassWizard will add and remove mapping macros here. Z\`uI+`  
// DO NOT EDIT what you see in these blocks of generated code! 6(X(f;MEl  
//}}AFX_MSG_MAP %'@&j2j>  
END_MESSAGE_MAP() e|xRK?aVBu  
r@k&1*&  
CHookApp::CHookApp() 5f}wQ  
{ !=eui$]  
 // TODO: add construction code here,  ;-U :t4  
 // Place all significant initialization in InitInstance c1!h;(&  
} F&I^bkvh  
# l}Y1^PDd  
CHookApp theApp; Y+j|T`d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) QnVYZUgJeV  
{ \vojF\  
 BOOL bProcessed=FALSE; \%rX~UhZ=  
 if(HC_ACTION==nCode) &o:wSe  
 { sIg{a( 1/  
  if((lParam&0xc0000000)==0xc0000000){// Key up q[7C,o>/  
   switch(wParam) zjB8~ku#  
   { dN;C-XF3s  
    case VK_MENU: 1;g>?18@  
     MaskBits&=~ALTBIT; WVp14Z?k  
     break; qKZ~)B j  
    case VK_CONTROL: Bo)w#X  
     MaskBits&=~CTRLBIT; O`Nzn~),x  
     break; 9boNB "h]T  
    case VK_SHIFT: |a/"7B|?\  
     MaskBits&=~SHIFTBIT; 2Vt iL^;5  
     break; beN0 ?G  
    default: //judge the key and send message !V#(g./W  
     break; 29 ')Y|$,  
   } Lk=f^qJ ]  
   for(int index=0;index<MAX_KEY;index++){ E*j)gj9  
    if(hCallWnd[index]==NULL) lc#su$xR>  
     continue; pz#oRuujY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "J3@Z,qW  
    { ;NB J@E,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^Jsx^?  
     bProcessed=TRUE; jt=mK ,%  
    } q>o1kTI  
   } 1i^!A&  
  } R\ <HR9r  
  else if((lParam&0xc000ffff)==1){ //Key down ~ex1,J*}t  
   switch(wParam) 6# ,2  
   { UC\CCDV#^  
    case VK_MENU: 45q-x_  
     MaskBits|=ALTBIT; fPa FL}&  
     break; Q4}2-}|  
    case VK_CONTROL: D$!(Iae  
     MaskBits|=CTRLBIT; \:%e 6M  
     break; 34&n { xv  
    case VK_SHIFT: @=isN'>]O  
     MaskBits|=SHIFTBIT; $5s?m\!jZz  
     break; 0,E*9y}  
    default: //judge the key and send message LoqS45-)  
     break; 9}:%CpD^~I  
   } +*mi%)I  
   for(int index=0;index<MAX_KEY;index++) /87?U; |V  
   { 7[.aAGTZ;  
    if(hCallWnd[index]==NULL) }&bO;o&>  
     continue; Y Dq5%N`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I?EtU/AD  
    { Pur~Rz\ \  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); e4j:IK>  
     bProcessed=TRUE; 9jCn|+  
    } d[6[3B  
   } w0q.cj@nd  
  } xOt%H\*k"  
  if(!bProcessed){ AKzhal!  
   for(int index=0;index<MAX_KEY;index++){ iQ~;to;Y  
    if(hCallWnd[index]==NULL) D/5 ah_;  
     continue; .|G([O^H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vB hpD  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~$Xz~#~  
   } XcAx@CY9c  
  } XFUlV;ek  
 } {D={>0  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [daUtKz  
} q5p!Ty"  
,73J#  
BOOL InitHotkey() pIXbr($  
{  ") q  
 if(hHook!=NULL){ dmgoVF_qR  
  nHookCount++; G\@ uj>Z  
  return TRUE; >WVos 4  
 } 9o@5:.b<j  
 else /xUTm=w7u  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); {U= Mfo?AH  
  if(hHook!=NULL) D C{l.a.  
   nHookCount++; b MZ-{<+i  
  return (hHook!=NULL); f!|7j}3  
} wrSw>sE"  
BOOL UnInit() ]DHB'NOh,  
{ u!S^lV@  
 if(nHookCount>1){ kc Q~}uFB  
  nHookCount--; 2f2Vy:&O_  
  return TRUE; {ZP0%MD  
 } _a|-_p  
 BOOL unhooked = UnhookWindowsHookEx(hHook); airg[dK  
 if(unhooked==TRUE){ p6VS<L  
  nHookCount=0; Zi<Y?Vm/,O  
  hHook=NULL; e* {'A  
 } "j#;MOK  
 return unhooked; G~b/!clN  
} i|?EgGFG  
,UNCBnv1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FZf{kWH  
{ /@h)IuW  
 BOOL bAdded=FALSE; E4idEQ}H  
 for(int index=0;index<MAX_KEY;index++){ I?<5 %  
  if(hCallWnd[index]==0){ GTgG0Ifeh  
   hCallWnd[index]=hWnd; 8vpB(VxV+  
   HotKey[index]=cKey; uQk}  
   HotKeyMask[index]=cMask; 1U[Q)(P  
   bAdded=TRUE; ' 5`w5swbc  
   KeyCount++; lR3`4bHA  
   break; VbLwhA2W}F  
  } E]Dcb*t  
 } {"k}C2K'r  
 return bAdded; *m)+|v}  
} L?:.8k`d  
cih[A2lp  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Q"rQVO  
{ hA 1_zKZ  
 BOOL bRemoved=FALSE; zmaf@T  
 for(int index=0;index<MAX_KEY;index++){ m3[R   
  if(hCallWnd[index]==hWnd){ ;7=pNK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Y<0}z>^  
    hCallWnd[index]=NULL; nsW #  
    HotKey[index]=0;  }^3CG9%  
    HotKeyMask[index]=0; %{"v^4  
    bRemoved=TRUE; E "9`  
    KeyCount--; t*J *?Ma  
    break; K{DsGf ,  
   } Cb:}AQ=  
  } 'y_<O|-  
 } s9^r[l@W0U  
 return bRemoved; Ix~_.&  
} Lh`B5  
\MhSIlM#  
void VerifyWindow() $D&N^}alW  
{ F%|F-6  
 for(int i=0;i<MAX_KEY;i++){ PiQs Vk  
  if(hCallWnd!=NULL){ my|]:(_0d  
   if(!IsWindow(hCallWnd)){ .t53+<A  
    hCallWnd=NULL; -(~OzRfYi  
    HotKey=0; E^'f'\m  
    HotKeyMask=0; y(81| c#  
    KeyCount--; b~oQhU??"  
   }  ZDn5d%  
  } ArK%?*`5  
 } u_31Db<  
} oJ4OVfknD  
_`|te|ccF  
BOOL CHookApp::InitInstance() MuI>ZoNF  
{ #^FDG1=  
 AFX_MANAGE_STATE(AfxGetStaticModuleState());  Q6qIx=c4  
 hins=AfxGetInstanceHandle(); dC,a~`%O  
 InitHotkey(); 4zo^ b0v  
 return CWinApp::InitInstance(); GQ -fEIi{  
} kn 5X:@{  
^qR2!fwm<  
int CHookApp::ExitInstance() ^\"@r%|  
{ ,/%@:Fh4  
 VerifyWindow(); SHcFnxEAIH  
 UnInit(); 9Su4nt`i  
 return CWinApp::ExitInstance(); cpLlkR O  
} JJE?!Yvc  
<A~a|A-QFR  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file r3OR7f[  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) vIzREu|5  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ `PoFKtVX M  
#if _MSC_VER > 1000 Gn?NY}.S  
#pragma once rm}%C(C{J  
#endif // _MSC_VER > 1000 Fi!BXngbd  
ue8"_N  
class CCaptureDlg : public CDialog -w'_Q"o2  
{ ctk~}( 1#  
 // Construction Sj(5xa[  
 public: ]0dj##5tJ  
  BOOL bTray; ]wxjd l  
  BOOL bRegistered; azBYh*s=5{  
  BOOL RegisterHotkey(); .dwy+BzS  
  UCHAR cKey; e #!YdXSx  
  UCHAR cMask; GBg~NkC7.  
  void DeleteIcon(); C srxi'Pe  
  void AddIcon(); NpPuh9e{  
  UINT nCount; j-$F@p_2F  
  void SaveBmp(); `>1XL2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #];b+ T  
  // Dialog Data Ga$J7 R  
  //{{AFX_DATA(CCaptureDlg) NB^+Hcb$  
  enum { IDD = IDD_CAPTURE_DIALOG }; ojva~mnFf  
  CComboBox m_Key; +`RQ ^9  
  BOOL m_bControl; 3u,CI!  
  BOOL m_bAlt; \>]C  
  BOOL m_bShift; 4it^-M  
  CString m_Path; Ea,L04K  
  CString m_Number; 'X%5i2  
  //}}AFX_DATA  |43dyJW  
  // ClassWizard generated virtual function overrides .Ld{QPa  
  //{{AFX_VIRTUAL(CCaptureDlg) N e<D'-  
 public: R\T1R"1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Q\moR^>  
 protected: {VmJVO]S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gJFx#s0?6.  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); jL6ZHEi#d7  
  //}}AFX_VIRTUAL _TbQjE&6  
  // Implementation ~NV 8avZ  
 protected: *Ei(BrL/;  
  HICON m_hIcon; ^Ay>%`hf*  
  // Generated message map functions d8C44q+ds  
  //{{AFX_MSG(CCaptureDlg) ^!v{ >3  
  virtual BOOL OnInitDialog(); ,wYA_1$$H  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); BN>t"9XpW  
  afx_msg void OnPaint(); })F.Tjf*  
  afx_msg HCURSOR OnQueryDragIcon(); "h`oT4j5q  
  virtual void OnCancel(); '#eY4d<i]n  
  afx_msg void OnAbout(); Y n7z#bu  
  afx_msg void OnBrowse(); r gw@  
  afx_msg void OnChange(); EGMIw?%Y`-  
 //}}AFX_MSG jY1^I26E  
 DECLARE_MESSAGE_MAP() I6e[K(7NY  
}; b2r]>*Vc  
#endif |L<p90  
Da3Z>/S  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file tv 7"4$T  
#include "stdafx.h" 4`[2Te>  
#include "Capture.h" nRHxbE}::  
#include "CaptureDlg.h" VV+gPC  
#include <windowsx.h> xO_u  
#pragma comment(lib,"hook.lib") uvMc B9  
#ifdef _DEBUG ZJf:a}=h  
#define new DEBUG_NEW AW <"3 !@  
#undef THIS_FILE ZBuh(be  
static char THIS_FILE[] = __FILE__; :9~LYJ ?  
#endif E' _6v  
#define IDM_SHELL WM_USER+1 `i5\(cdl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); MLT ^7'y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ss0`9:z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; X#Sgf|$  
class CAboutDlg : public CDialog 0&$,?CL?  
{  MU>6s`6O  
 public: 5< $8.a#  
  CAboutDlg(); = 9!|%j  
  // Dialog Data k-!Jww  
  //{{AFX_DATA(CAboutDlg) w.o>G2u  
  enum { IDD = IDD_ABOUTBOX }; B{tROuN<  
  //}}AFX_DATA f`K[oCfu  
  // ClassWizard generated virtual function overrides 5HC5   
  //{{AFX_VIRTUAL(CAboutDlg) wLa8&E[  
 protected: ?#~km0~F)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support K41Gn  
  //}}AFX_VIRTUAL 3C gmZ7[  
  // Implementation ty\F~]Oo  
 protected: .%G>z"Xx  
  //{{AFX_MSG(CAboutDlg) SpC6dkxD\  
  //}}AFX_MSG [/Sk+ID  
  DECLARE_MESSAGE_MAP() I} .9  
}; s H(io  
]|_UpP8EP  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =/e$Rp  
{ +~n4</  
 //{{AFX_DATA_INIT(CAboutDlg) 3lsfT-|Wt&  
 //}}AFX_DATA_INIT )]tf|Mbu  
} S;^'Ek"Z.  
@%"r69\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) LsxRK5   
{ BZOB\Ym  
 CDialog::DoDataExchange(pDX); lx{ ' bzv  
 //{{AFX_DATA_MAP(CAboutDlg) 3|Y2BA d  
 //}}AFX_DATA_MAP 0dW*].Gi:  
} -, uT8'  
1c|{<dFm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) hS'!JAM>Q  
 //{{AFX_MSG_MAP(CAboutDlg) 'Px}#f0IR  
 // No message handlers L\zyBfK}  
 //}}AFX_MSG_MAP [NoOA  
END_MESSAGE_MAP() (Xl+Zi>\{  
$1y8X K7r  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) b5)a6qtb  
: CDialog(CCaptureDlg::IDD, pParent) 5p]V/<r  
{ RxE.t[  
 //{{AFX_DATA_INIT(CCaptureDlg)  B9dc *  
  m_bControl = FALSE; \GPTGi5A  
  m_bAlt = FALSE; l T#WM]  
  m_bShift = FALSE; )kEH}P&  
  m_Path = _T("c:\\"); x~QZVL=:  
  m_Number = _T("0 picture captured."); @TJ2 |_s6]  
  nCount=0; 8?N![D\@  
  bRegistered=FALSE; QlMv_|`9  
  bTray=FALSE; K=1prv2  
 //}}AFX_DATA_INIT s`en8%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]E $bK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oU|_(p"e|  
} c'D NO~H  
Vg(FF "  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9qk J<  
{ g(C/J9J  
 CDialog::DoDataExchange(pDX); K5HzA1^  
 //{{AFX_DATA_MAP(CCaptureDlg) H`s[=Y,m  
  DDX_Control(pDX, IDC_KEY, m_Key); ws<p BC,m  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); VVbFn9+V  
  DDX_Check(pDX, IDC_ALT, m_bAlt); V an=dz G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); N~ajrv}kd  
  DDX_Text(pDX, IDC_PATH, m_Path); 'Q"Mu  
  DDX_Text(pDX, IDC_NUMBER, m_Number); eD|"?@cE  
 //}}AFX_DATA_MAP !u;gGgQF  
} MZ?+I~@  
T"3:dkQw  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !0_/=mA^  
//{{AFX_MSG_MAP(CCaptureDlg) A,EuUp  
 ON_WM_SYSCOMMAND() i9Eh1A3Y  
 ON_WM_PAINT() AC*SmQ\>!  
 ON_WM_QUERYDRAGICON() PqMu2 e  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) wf_ $#.;m  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M8R/a[ -A  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "R\D:Olb#  
//}}AFX_MSG_MAP ,3 [FD9  
END_MESSAGE_MAP() t?H sfN  
mNlbiB  
BOOL CCaptureDlg::OnInitDialog() TBZhL  
{ 3hVuC1;"  
 CDialog::OnInitDialog(); CfT(a!;Eox  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); zY2x_}#Q\"  
 ASSERT(IDM_ABOUTBOX < 0xF000); i|rCGa0}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \D1@UyE  
 if (pSysMenu != NULL) `! xI!Y\  
 { hka%!W5  
  CString strAboutMenu; oB(9{6@N  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #O{cplh,  
  if (!strAboutMenu.IsEmpty()) F:sUGM,  
  { {e5-  
   pSysMenu->AppendMenu(MF_SEPARATOR); Jn%Etz-  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); e8M0Lz#}  
  } DVt^O [  
 } D`fIw` _  
 SetIcon(m_hIcon, TRUE); // Set big icon D!8v$(#hR  
 SetIcon(m_hIcon, FALSE); // Set small icon TK0WfWch  
 m_Key.SetCurSel(0); >)HKruSW.  
 RegisterHotkey(); 'nS>'yYH#  
 CMenu* pMenu=GetSystemMenu(FALSE); T 0qM "  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); c axOxRo\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $pIo`F _W  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +6x}yc:yd  
 return TRUE; // return TRUE unless you set the focus to a control }~p%e2<  
} _gEojuaN  
_U9.u#>sV  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Z_a@,k:+[  
{ /A+5q\8G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /Ny#+$cfk  
 { 7uf5w0]  
  CAboutDlg dlgAbout; 9fWR8iV  
  dlgAbout.DoModal(); h8 FV2"  
 } wD /jN:  
 else +-T|ov<  
 { j`+{FCB7  
  CDialog::OnSysCommand(nID, lParam); 9Wg;M#c2Y|  
 } j'OXT<n*  
} At'M? Q@v  
P4LiU2C  
void CCaptureDlg::OnPaint() 4|4 *rhwp  
{ e jR_3K^  
 if (IsIconic()) 2PSkLS&IM  
 { fCZ"0P3(  
  CPaintDC dc(this); // device context for painting ,J=lHj  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); l;$FR4}d  
  // Center icon in client rectangle =q>lP+  
  int cxIcon = GetSystemMetrics(SM_CXICON); ,M:[GuXD<  
  int cyIcon = GetSystemMetrics(SM_CYICON); NV==[$(r  
  CRect rect; Uw| -d[!  
  GetClientRect(&rect); b|*+!v:I>T  
  int x = (rect.Width() - cxIcon + 1) / 2; aPRMpY-YC3  
  int y = (rect.Height() - cyIcon + 1) / 2; / U!xh3  
  // Draw the icon I`s~.fZt  
  dc.DrawIcon(x, y, m_hIcon); "3'a.b akw  
 } bc NyB$S  
 else }|&^Sg%95  
 { {?q`9[Z  
  CDialog::OnPaint(); mwMu1#  
 } 4`Zo Ar-5|  
} \T!,Z;zK  
%zo 6A1Q;  
HCURSOR CCaptureDlg::OnQueryDragIcon() t 1~k+  
{ ,tDLpnB@;  
 return (HCURSOR) m_hIcon; -d thY(8  
} WYP\J1sy  
JpZ_cb`<E'  
void CCaptureDlg::OnCancel() }{kn/m/  
{ :S}ZF$ $j%  
 if(bTray) zqURnsJ  
  DeleteIcon(); ).0p\.W~  
  CDialog::OnCancel(); K7C!ZXw~  
} K4o']{:U  
LK!sk5/  
void CCaptureDlg::OnAbout() Efoy]6P\  
{ TU;AO%5  
 CAboutDlg dlg; kd_! S[  
 dlg.DoModal(); !T2{xmHKv$  
} $5\!ws<cZ  
{=,G>p  
void CCaptureDlg::OnBrowse() %_!0V*X*  
{ rP,|  
 CString str; [P0c,97_ H  
 BROWSEINFO bi; 0l/7JH_@V  
 char name[MAX_PATH]; ? * r  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .tHjGx  
 bi.hwndOwner=GetSafeHwnd(); -0BxZ AW=  
 bi.pszDisplayName=name; Q&lb]U+\u  
 bi.lpszTitle="Select folder"; )A6=P%;}>I  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &/:c?F?l  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .t9`e=%  
 if(idl==NULL) -ik=P ]?  
  return; j}K 3YfH  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Z op/ MeI  
 str.ReleaseBuffer(); 4^k8| # c  
 m_Path=str; Dx=RLiU9  
 if(str.GetAt(str.GetLength()-1)!='\\') 1r*yYm'  
  m_Path+="\\"; s&+`>  
 UpdateData(FALSE); ~C3J-z<  
} tOte[~,  
|eg8F$WU  
void CCaptureDlg::SaveBmp() xi4b;U j  
{ W$Xr:RU  
 CDC dc; PW iuM=E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); .:4*HB  
 CBitmap bm; I+ 3qu=  
 int Width=GetSystemMetrics(SM_CXSCREEN); 6xY6EC  
 int Height=GetSystemMetrics(SM_CYSCREEN); }eI9me@Aa  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @P>>:002/  
 CDC tdc; 8G2QI4  
 tdc.CreateCompatibleDC(&dc); B5h)F> &G  
 CBitmap*pOld=tdc.SelectObject(&bm); `sy_'`i>X  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); L_|iQwU%  
 tdc.SelectObject(pOld); f`K#=_Kq7  
 BITMAP btm; `:R9M+ OX  
 bm.GetBitmap(&btm); ,_/\pX0  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; O2yD{i#l*#  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); wDSwcNS  
 BITMAPINFOHEADER bih; v-^<,|vm2f  
 bih.biBitCount=btm.bmBitsPixel; GMkni'pV  
 bih.biClrImportant=0; 8|$g"? CU  
 bih.biClrUsed=0; 9~2iA,xs  
 bih.biCompression=0; +?*.Emzl@  
 bih.biHeight=btm.bmHeight; J5O/c,?g  
 bih.biPlanes=1; $P)-o?eer  
 bih.biSize=sizeof(BITMAPINFOHEADER); pHye8v4fvi  
 bih.biSizeImage=size; Cs,Cb2[  
 bih.biWidth=btm.bmWidth; @[`]w`9Q7  
 bih.biXPelsPerMeter=0; XbeT x  
 bih.biYPelsPerMeter=0; k]P'D .  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); #c"05/=A  
 static int filecount=0; pIug$Ke_%  
 CString name; H;@0L}Nu+}  
 name.Format("pict%04d.bmp",filecount++); *a0#PfS[  
 name=m_Path+name; aIr"!. 4  
 BITMAPFILEHEADER bfh; Sn 7 h$  
 bfh.bfReserved1=bfh.bfReserved2=0; 1{RA\CF  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %KN2iNq  
 bfh.bfSize=54+size; <g\:By^  
 bfh.bfOffBits=54; ( Rp5g}b  
 CFile bf; j9w{=( MV  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~(NFjCUY?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); x9 t %  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ftRdK>a D  
  bf.WriteHuge(lpData,size); =Lb(N61  
  bf.Close(); Eh|6{LDn!  
  nCount++; BT^=p  
 } W>c*\)Xk !  
 GlobalFreePtr(lpData); 7:=(yBG  
 if(nCount==1) %F$ ]v  
  m_Number.Format("%d picture captured.",nCount); h/y0Q~|/d  
 else {w,<igh  
  m_Number.Format("%d pictures captured.",nCount); 7|bBC+;(  
  UpdateData(FALSE); aI}htb{m`  
} 4x=sJ%E  
^ 5>W`vwp  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) qI tbY%  
{ R%t|R7 9I  
 if(pMsg -> message == WM_KEYDOWN) s ya!VF]`  
 { Y t_t>  
  if(pMsg -> wParam == VK_ESCAPE) KG96;l@'(  
   return TRUE; M\Wg|gpy  
  if(pMsg -> wParam == VK_RETURN) rTOex]@N  
   return TRUE; (9'q/qgTO  
 } { i4`- w  
 return CDialog::PreTranslateMessage(pMsg); ,6f6r  
} Se\iM s  
Q&@<?K9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y{@foIZ  
{ o)CW7Y#?,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Xi+l1xe  
  SaveBmp(); `r}a:w-  
  return FALSE; f'7/Wj  
} /Tw $} 8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7 4(bo \  
 CMenu pop; qC=ZH#  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z,@R jaX  
 CMenu*pMenu=pop.GetSubMenu(0); Dr(;A>?qG  
 pMenu->SetDefaultItem(ID_EXITICON); Ra^c5hP:.E  
 CPoint pt; ycEp,V;[Z  
 GetCursorPos(&pt); :9q|<[Y^  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); AT2D+Hi=E  
 if(id==ID_EXITICON) ' ~z`kah  
  DeleteIcon(); 1-<?EOYaE  
 else if(id==ID_EXIT) !wKNYe  
  OnCancel(); jd "YaZOQ  
 return FALSE; :; La V  
} >m=XqtP  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); v0;dk(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]C|xo.=?]  
 AddIcon(); I8IH\5k  
 return res; ymR AQVv  
} ;qUd]c9oi  
0&Iu+hv  
void CCaptureDlg::AddIcon() ~X'hRNFx~  
{ .\)ek[?  
 NOTIFYICONDATA data; NID2$p  
 data.cbSize=sizeof(NOTIFYICONDATA); s(=@J?7As  
 CString tip; AvuGAlP  
 tip.LoadString(IDS_ICONTIP); |h((SreO  
 data.hIcon=GetIcon(0); u)/i$N  
 data.hWnd=GetSafeHwnd(); P`_Q-vu  
 strcpy(data.szTip,tip); a +9_sUq  
 data.uCallbackMessage=IDM_SHELL; \!0~$?_)P  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3cNr~`7  
 data.uID=98; Y]B9*^d<  
 Shell_NotifyIcon(NIM_ADD,&data); q'Y)Y(d  
 ShowWindow(SW_HIDE); u=#_8e(9Z  
 bTray=TRUE; Cs,t:ajP  
}  z}*L*Sk  
mhs%8OTN  
void CCaptureDlg::DeleteIcon() u2U+uD@yA  
{ ws,VO*4  
 NOTIFYICONDATA data; ? fM_Y  
 data.cbSize=sizeof(NOTIFYICONDATA); hsI9{j]f  
 data.hWnd=GetSafeHwnd(); [LbCG  
 data.uID=98; C6D Eq>v  
 Shell_NotifyIcon(NIM_DELETE,&data); \#"&S@%c  
 ShowWindow(SW_SHOW); q _:7uQ  
 SetForegroundWindow(); /q"8sj/  
 ShowWindow(SW_SHOWNORMAL); 7Fb!;W#X  
 bTray=FALSE; E-?JHJloU  
} >bO}sx1?  
K2tOt7M!  
void CCaptureDlg::OnChange() N'21I$D  
{ {Z~ze`N/  
 RegisterHotkey(); 'm/`= QX  
} RNcnE1=  
f4|ir3oy  
BOOL CCaptureDlg::RegisterHotkey() }|c-i.0=  
{ """eU,"  
 UpdateData(); E1qf N>0Z  
 UCHAR mask=0; X}&Y(kOT  
 UCHAR key=0; gzyi'K<  
 if(m_bControl) \YsLVOv%:d  
  mask|=4; Cv]$w(k  
 if(m_bAlt) U/\LOIs  
  mask|=2; N'%l/  
 if(m_bShift) $n::w c  
  mask|=1; irGgo-x  
  key=Key_Table[m_Key.GetCurSel()]; y"w`yl{_  
 if(bRegistered){ 9 tCF m.m  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); QG XR<Y  
  bRegistered=FALSE; -}H EV#ev  
 } =~k#<q1^  
 cMask=mask; TO] cZZ<  
 cKey=key; ;\Pq  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); V24FzQ?z:.  
 return bRegistered; f!cYLU1e@  
} ?T'a{ ~]R  
ey U*20  
  四、小结 /@LUD=  
=UZQ` {  
  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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