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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: r5Q#GY>  
  WXo bh  
  一、实现方法 7Tp +]"bL  
F^.]g@g.|  
  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: ;Mmu}  
X+{brvM<  
#pragma data_seg("shareddata") #HP-ne; #  
HHOOK hHook =NULL; //钩子句柄 aY4v'[  
UINT nHookCount =0; //挂接的程序数目 UOj*Gt&  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 8@doKOA~T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 k"=*'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey { Mf-?_%  
static int KeyCount =0; $J<WFDn9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  Mp js  
#pragma data_seg() l_;6xkv4  
CY':'aWfa<  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 o;DK]o>kH  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: q`8 5-  
e KuF7Oo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +P 9eE,WR  
cKey,UCHAR cMask) 7m%12=Im5  
{ !Mgo~h"]#  
 BOOL bAdded=FALSE; !ni 1 qM  
 for(int index=0;index<MAX_KEY;index++){ ;Y8>?  
  if(hCallWnd[index]==0){ ?x 0gI   
   hCallWnd[index]=hWnd; <l!:#u  
   HotKey[index]=cKey; yIr0D 6L  
   HotKeyMask[index]=cMask; Jza ?DhSAZ  
   bAdded=TRUE; M*cF'go  
   KeyCount++; O46v  
   break; 0$b4\.0>~  
  } V^!^wLLi  
 } |Y6;8e`H  
 return bAdded; sZ7,7E|_  
} ' -9=>  
//删除热键 }(DH_0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) __+8wC  
{ -da: j-_  
 BOOL bRemoved=FALSE; mJ(ElDG  
 for(int index=0;index<MAX_KEY;index++){ R-<8j`[0  
  if(hCallWnd[index]==hWnd){ g'w"U9tjO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /kw;q{>?o  
    hCallWnd[index]=NULL; j[mII5e7g  
    HotKey[index]=0; _O Jfd  
    HotKeyMask[index]=0; )}"`$6:k`  
    bRemoved=TRUE; Q`.q,T8I  
    KeyCount--; `'5vkO>  
    break; BHU$QX  
   } 9@IL547V  
  } z6;hFcO  
 } QBi]gT@&g  
 return bRemoved; /s+IstW  
} bZAL~z+ V  
lIx./Nf  
oclU)f.,  
  DLL中的钩子函数如下: p_]b=3wt~  
ypGt6t(;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @^ti*`  
{ h6IXD N  
 BOOL bProcessed=FALSE; OAiv3"p  
 if(HC_ACTION==nCode) hosY`"X  
 { &%@O V:C  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 '/X]96Ci7  
   switch(wParam) 5a@9PX^.J  
   {  n53c} ^  
    case VK_MENU: KZcmNli&A  
     MaskBits&=~ALTBIT; E8R;S}P A  
     break; b5Q>e%i#  
    case VK_CONTROL: ":s_ O.  
     MaskBits&=~CTRLBIT; |6^%_kO!|  
     break; );q~TZ[Do  
    case VK_SHIFT: $)X8'1%6  
     MaskBits&=~SHIFTBIT; rev*G:  
     break; ]e7?l/N[  
    default: //judge the key and send message 'DpJ#w\81  
     break; Q[q`)~|  
   } ~LOE^6C+~o  
   for(int index=0;index<MAX_KEY;index++){ &dK !+  
    if(hCallWnd[index]==NULL) hOj+z?  
     continue; 7m]J7 +4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $)8,dS  
    { Su? cC/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :{lP9%J-  
     bProcessed=TRUE; >}O}~$o  
    } [2Nux0g  
   } '6>*J  
  } <m1v+cnqo  
  else if((lParam&0xc000ffff)==1){ //有键按下 v3XM-+Z4  
   switch(wParam) b.\xPb  
   { q-_!&kDK"  
    case VK_MENU: GQCdB>   
     MaskBits|=ALTBIT; :E~rve'  
     break; T{f$S  
    case VK_CONTROL: k1zK3I&c_  
     MaskBits|=CTRLBIT; fG$LqzyqlK  
     break; IOuqC.RJ}o  
    case VK_SHIFT: gM=:80  
     MaskBits|=SHIFTBIT; -]D/8,|s  
     break; hKWWN`;b !  
    default: //judge the key and send message $8HiX6r  
     break; xY!ud)  
   } ]Zc|<f;  
   for(int index=0;index<MAX_KEY;index++){ ,J!$Q0e  
    if(hCallWnd[index]==NULL) Iapz,nuE  
     continue; hEsi AbTyF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kV5)3%?  
    { FN=WU< 5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 51#OlvD  
     bProcessed=TRUE; L*A-&9.p3  
    } N 1Ag .  
   } M~|7gK.m1  
  } foQo`}"5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 }(ORh2Ri  
   for(int index=0;index<MAX_KEY;index++){ DR:$urU$  
    if(hCallWnd[index]==NULL) 5ct&fjmR_  
     continue; A!x&,<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =uAy/S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @&WHX#  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 q=BljSX  
   } K SO D(  
  } >5L_t   
 } $Emu*'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); u ij^tN%  
} Kmx^\vDs  
%'HDP3  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: W_Y8)KxG:L  
.)!QsBU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %sr- xE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NBc^(F"  
yivu|q  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: X4!7/&  
/]xa}{^B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @3O)#r}\  
{ Kh(`6 f  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 4r1\&sI$~  
 { i!?gga  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 71c[ `h*0{  
  SaveBmp(); 8a P/vToa  
  return FALSE; v CaN[  
 } 3$k#bC  
 …… //其它处理及默认处理 H,X|-B  
} 4F~^RR"  
=W.}&  
6&eXQl  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Lau@HYW0  
=79R;|5  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 e}e8WR=B  
8I#ir4z#<  
  二、编程步骤 A>yU0\A  
YNU}R/u6^  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; Y7VO:o  
<'I["Um  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; '3(^Zv  
[s {!  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; s3Vb2C*  
Z nc(Q  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ijF_ KP'  
"n!yK  
  5、 添加代码,编译运行程序。 ((k"*f2%  
+tqErh?Al  
三、程序代码 u#E'k KGO  
!LI<%P)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  Z.6dL  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 8-#%l~dr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ dw bR,K  
#if _MSC_VER > 1000 'jtC#:ePK  
#pragma once &N|$G8\CY  
#endif // _MSC_VER > 1000 *glZb;_  
#ifndef __AFXWIN_H__ 6Dq4Q|C  
#error include 'stdafx.h' before including this file for PCH FRBu8WW0L  
#endif 86r5!@WN  
#include "resource.h" // main symbols {3tzr;c?  
class CHookApp : public CWinApp ^/2I)y]W0  
{ 6Xlzdt  
 public: bmfM_oz  
  CHookApp(); 5</$dcG  
  // Overrides 'YNaLZ20  
  // ClassWizard generated virtual function overrides =Ph8&l7~sp  
  //{{AFX_VIRTUAL(CHookApp) cj/`m$  
 public: >gk_klLh  
  virtual BOOL InitInstance(); HGDrH   
  virtual int ExitInstance(); #< im?  
  //}}AFX_VIRTUAL ~U9K<_U  
  //{{AFX_MSG(CHookApp) *v>ZE6CL  
  // NOTE - the ClassWizard will add and remove member functions here. c3A\~tHW  
  // DO NOT EDIT what you see in these blocks of generated code ! xP9(J 0y  
  //}}AFX_MSG tMIYVHGy  
  DECLARE_MESSAGE_MAP() n|SV)92o1  
}; RK>Pe3<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >qjV{M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =l ,P'E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 157_0  
BOOL InitHotkey(); '|C3t!H`  
BOOL UnInit(); 'X`Z1L/  
#endif ~4S$+*'8  
l]nt@0+  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |?`5~f  
#include "stdafx.h" RgE`Hr  
#include "hook.h" woYD &Oml  
#include <windowsx.h> *sho/[~_  
#ifdef _DEBUG T(4d5 fY  
#define new DEBUG_NEW (C2 XFg_  
#undef THIS_FILE yVd^A2  
static char THIS_FILE[] = __FILE__; p5Q]/DhG  
#endif f-=\qSo  
#define MAX_KEY 100 1^p/#jt  
#define CTRLBIT 0x04 E h%61/  
#define ALTBIT 0x02 Y Y:Bw W:  
#define SHIFTBIT 0x01 .1x04Np!  
#pragma data_seg("shareddata") y}Ky<%A!P  
HHOOK hHook =NULL; !Brtao"m  
UINT nHookCount =0; A KNx~!%2  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |D3u"Y!:^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT  6 K $mW  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #Ondhy%h[  
static int KeyCount =0; z`y9<+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }2A6W%^>]  
#pragma data_seg() <P9fNBGa  
HINSTANCE hins; }kbSbRH43  
void VerifyWindow(); $6QIYF""  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) H#- 3  
//{{AFX_MSG_MAP(CHookApp) |Lq8cA)|y  
// NOTE - the ClassWizard will add and remove mapping macros here. #m+!<  
// DO NOT EDIT what you see in these blocks of generated code! SGd]o"VF  
//}}AFX_MSG_MAP *OVB;]D3+  
END_MESSAGE_MAP() (z?HyxRT  
1C[9}}  
CHookApp::CHookApp() .J#'k+>  
{ bRC243]g*A  
 // TODO: add construction code here, FoefBo?g65  
 // Place all significant initialization in InitInstance &[.5@sv  
} xVvUx,t  
3KLUH=)P  
CHookApp theApp; kH!Z|P s?R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Zw]`z*,yRA  
{ ?5|;3N/zt  
 BOOL bProcessed=FALSE; Fc[KIG3@  
 if(HC_ACTION==nCode) N,ht<l\  
 { QWmE:F[M~  
  if((lParam&0xc0000000)==0xc0000000){// Key up ] !UYl  
   switch(wParam) A'qe2]  
   { HN47/]"*  
    case VK_MENU: iP/v "g"g  
     MaskBits&=~ALTBIT; g14*6O:  
     break; A#u U ]S  
    case VK_CONTROL: 4" @<bKx  
     MaskBits&=~CTRLBIT; tz1@s nes  
     break; _8K+iqMZG  
    case VK_SHIFT: ?}||?2=P  
     MaskBits&=~SHIFTBIT; 6*8Wtq  
     break; pA7-B>Y  
    default: //judge the key and send message  Xo^8o0xi  
     break; K/4@ 2vF  
   } h\RX/C!+  
   for(int index=0;index<MAX_KEY;index++){ :I"CQ C[Z  
    if(hCallWnd[index]==NULL) FU|brS t  
     continue; ycGY5t@K@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {N(qS'N  
    { h!"2Ux3!x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jiI=tg;  
     bProcessed=TRUE; `CK~x =  
    } *k$[/{S1-  
   } ~G@NWF?7  
  } ,(jJOFf  
  else if((lParam&0xc000ffff)==1){ //Key down +a#&W}K  
   switch(wParam) 8&QST!JGSX  
   { C*`WMP*  
    case VK_MENU: D(cD8fn,J  
     MaskBits|=ALTBIT; AbU`wr/h 4  
     break; za l]t$z>  
    case VK_CONTROL: t Zxx#v`  
     MaskBits|=CTRLBIT; $ m`Dyu  
     break; gqaM<!]  
    case VK_SHIFT: HC0juT OiO  
     MaskBits|=SHIFTBIT; Q+CJd>B  
     break; 0AZ9I!&i  
    default: //judge the key and send message w+$$uz  
     break; 9#E *o~1  
   } 1nVQYqT_  
   for(int index=0;index<MAX_KEY;index++) $`pf!b2Z  
   { t]c<HDCK  
    if(hCallWnd[index]==NULL) '2,~'Zk  
     continue; O7.V>7Y9H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AXw qN:P}  
    { EPo)7<|>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); HOW<IZ^  
     bProcessed=TRUE; 7uBx  
    } --HDEc|  
   } +h) "m/mE  
  } l;$F[/3a  
  if(!bProcessed){ j/v>,MM  
   for(int index=0;index<MAX_KEY;index++){ 2OG/0cP  
    if(hCallWnd[index]==NULL) Z;+,hR((  
     continue; g pciv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cGot0' mB  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "|\hTRQ  
   } Nr4Fp`b8  
  } 32GI+NN  
 } vc#o(?g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %<i sdvF  
} ^!['\  
kHg|!  
BOOL InitHotkey() L5hF-Ek! 3  
{ QPy h.9:N  
 if(hHook!=NULL){ #rHMf%0  
  nHookCount++; >^8O:.  
  return TRUE; 4vg,g(qi<  
 } T*p7[}#  
 else ,7nu;fOT[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ueg%yvO  
  if(hHook!=NULL) r$<!?Z  
   nHookCount++; 6O4 *OR<&  
  return (hHook!=NULL); +:A `e+\  
} 'm0WPS/6E  
BOOL UnInit() 6 `6 I<OJ\  
{ Ust +g4  
 if(nHookCount>1){ /.:1Da  
  nHookCount--; -6MPls+  
  return TRUE; V7$ m.P#uM  
 } rEr=Mi2  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 1@Ba7>%'  
 if(unhooked==TRUE){ TF%n1H-sF  
  nHookCount=0; 4Q+,_iP  
  hHook=NULL; (4Db%Iw  
 } $`xpn#l z  
 return unhooked; CW`^fI9H  
} 51:5rN(_  
R0M>'V?e  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) e"@r[pq-{u  
{ jS,Pu%fR  
 BOOL bAdded=FALSE; (~@.9&cBD  
 for(int index=0;index<MAX_KEY;index++){ clDn=k<  
  if(hCallWnd[index]==0){ d 6Y9D=O  
   hCallWnd[index]=hWnd; Cq@7oi]W0  
   HotKey[index]=cKey; azZ|T{S  
   HotKeyMask[index]=cMask; yCz"~c  
   bAdded=TRUE; |A4B4/!  
   KeyCount++; hGFi|9/-u  
   break; -cUW,>E  
  } 7L+Wj }m  
 } 2?(/$F9X,  
 return bAdded;  7]@M  
} I N@ ~~  
oD%n}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `+=Zq :0  
{ x~'_;>]r_  
 BOOL bRemoved=FALSE; +4J'> dr  
 for(int index=0;index<MAX_KEY;index++){ DN9x<%/-  
  if(hCallWnd[index]==hWnd){ +:m)BLA4l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^PdD-tY<  
    hCallWnd[index]=NULL; i~GW  
    HotKey[index]=0; tzl,r"k3  
    HotKeyMask[index]=0; 6oKlr,.  
    bRemoved=TRUE; `-nSH)GBM  
    KeyCount--; `B?+1Gv  
    break; =Q"thsR  
   } EAY+#>L*  
  } oCwep^P(v  
 } ZSlK   
 return bRemoved; 2SC'Z>A  
} 3{H!B&sb  
,>g( %3C  
void VerifyWindow() C&q}&=3r  
{ zCq6k7u  
 for(int i=0;i<MAX_KEY;i++){ Ev#, }l+  
  if(hCallWnd!=NULL){ ^`-Hg=d  
   if(!IsWindow(hCallWnd)){ ~+\A4BW  
    hCallWnd=NULL; 5 Bcmz'?!  
    HotKey=0; <)cmI .J3  
    HotKeyMask=0; .&=\ *cZc  
    KeyCount--; tIA)LF  
   } KJn 3&7  
  } u 'ng'j'  
 } \#h=pz+jb  
} | rpMwkR  
)W@  
BOOL CHookApp::InitInstance() R]kH$0`  
{ PzjIM!>  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Nf~B 1vkp  
 hins=AfxGetInstanceHandle(); PHsM)V+  
 InitHotkey(); yYC\a7Al4  
 return CWinApp::InitInstance(); |bRi bB  
} X7aj/:fXe  
3,+Us B%  
int CHookApp::ExitInstance() =0@o(#gM  
{ c1]\.s  
 VerifyWindow(); ?s0")R&  
 UnInit(); =c[mch%E  
 return CWinApp::ExitInstance(); lr,i5n{6  
} H]lD*3b  
v|kL7t)}  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |qk%UN<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) YkV-]%c  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ht)KS9Xu  
#if _MSC_VER > 1000 `O=LQ m`  
#pragma once <>1*1%m  
#endif // _MSC_VER > 1000 z:$TW{%M  
(7aE!r\Ab  
class CCaptureDlg : public CDialog %ye4FwkRy  
{ E<_+Tc  
 // Construction DB1Y`l  
 public: _`94CC:  
  BOOL bTray; XG6UV('  
  BOOL bRegistered; -E!V;Tgc%U  
  BOOL RegisterHotkey(); ;/nR[sibN  
  UCHAR cKey; |z%*}DPrpa  
  UCHAR cMask; =>h~<88#5  
  void DeleteIcon(); hmd,g>J:<  
  void AddIcon(); v3jx2Z  
  UINT nCount; \RP=Gf  
  void SaveBmp(); Eh;~y*k\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor HaamLu  
  // Dialog Data DU4Prjb'  
  //{{AFX_DATA(CCaptureDlg) K>$od^f%c  
  enum { IDD = IDD_CAPTURE_DIALOG }; seH#v  
  CComboBox m_Key; *SZ*S %oS3  
  BOOL m_bControl; M*c`@\  
  BOOL m_bAlt; aKCXV[PO   
  BOOL m_bShift; >&9Iy"  
  CString m_Path; {z%%(,I  
  CString m_Number; <BN)>NqM  
  //}}AFX_DATA U `"nX)$  
  // ClassWizard generated virtual function overrides `Uw^,r  
  //{{AFX_VIRTUAL(CCaptureDlg) ~F]- +|  
 public: B6Tn8@O  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Zt[1RMO  
 protected: 4d3PF`,H`  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !$+J7\& 7p  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); CLD*\)QD\  
  //}}AFX_VIRTUAL N1!|nS3w  
  // Implementation 7<?v!vQ}-  
 protected: `}u~nu<  
  HICON m_hIcon; sOW-GWSE<  
  // Generated message map functions $wVY)p9Q  
  //{{AFX_MSG(CCaptureDlg) B|~\m ~  
  virtual BOOL OnInitDialog(); GRj{*zs  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *$_<| g)9  
  afx_msg void OnPaint(); { lLUZM  
  afx_msg HCURSOR OnQueryDragIcon(); 413r3/  
  virtual void OnCancel(); ?z60b=f8  
  afx_msg void OnAbout(); aX1|&erI  
  afx_msg void OnBrowse(); X;p,Wq#D'  
  afx_msg void OnChange(); =N n0)l  
 //}}AFX_MSG H1=R(+-s  
 DECLARE_MESSAGE_MAP() c66Iy"  
}; PxK  
#endif D1lHq/  
`&>!a  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O`mW,  
#include "stdafx.h" A0WQZt!FEN  
#include "Capture.h" 7IZ(3B<87t  
#include "CaptureDlg.h" fi#o>tVyJ  
#include <windowsx.h> )r1Z}X(#d  
#pragma comment(lib,"hook.lib") '&T4ryq3"  
#ifdef _DEBUG F{f "xM  
#define new DEBUG_NEW Mp$ uEi  
#undef THIS_FILE BbiBtU  
static char THIS_FILE[] = __FILE__; S3j/(BG  
#endif m&|?mTo>m  
#define IDM_SHELL WM_USER+1 FAU^(]-5m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1p9f& w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g >-iBxml  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; F=^vu7rf  
class CAboutDlg : public CDialog O*yc8fUI  
{ OBN]bvCJ  
 public: l=EIbh  
  CAboutDlg(); Yq) wE|k/  
  // Dialog Data 9[6*FAFJPP  
  //{{AFX_DATA(CAboutDlg) 8 s:sMU:Q  
  enum { IDD = IDD_ABOUTBOX }; l= !KZaH  
  //}}AFX_DATA &g@?{5FP  
  // ClassWizard generated virtual function overrides 8u;l<^<  
  //{{AFX_VIRTUAL(CAboutDlg) oOe5IczS(  
 protected: >48zRi\N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R4QXX7h!  
  //}}AFX_VIRTUAL {?BxVDD07  
  // Implementation tM ]qR+  
 protected: "vjz $.  
  //{{AFX_MSG(CAboutDlg) T92k"fBY  
  //}}AFX_MSG 5oWR}qqFK  
  DECLARE_MESSAGE_MAP() uj;-HN)6  
}; Y@^M U->+  
k9WihejS  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) gnB%/g[_  
{ |'mgo  
 //{{AFX_DATA_INIT(CAboutDlg) kY4riZnm  
 //}}AFX_DATA_INIT {Sd{|R_  
} t~ Q {\!  
Eh0R0;l5>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Y R#_<o  
{ =JNoC01D  
 CDialog::DoDataExchange(pDX); +lU:I  
 //{{AFX_DATA_MAP(CAboutDlg) z+NXD4  
 //}}AFX_DATA_MAP "i4@'`r  
} [ZOo%"M_Y  
e [3sWv  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SS@# $t:  
 //{{AFX_MSG_MAP(CAboutDlg) SAc}5.  
 // No message handlers )5)S8~Oc  
 //}}AFX_MSG_MAP K )1K ]  
END_MESSAGE_MAP() ;&^S-+  
S#_i<u$$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) do7 [Nj  
: CDialog(CCaptureDlg::IDD, pParent) SpjL\ p0  
{ 70a7}C\/o  
 //{{AFX_DATA_INIT(CCaptureDlg) xhj A!\DS  
  m_bControl = FALSE; yo") G!BN  
  m_bAlt = FALSE; >j_,3{eJ  
  m_bShift = FALSE; BRFA%FZ,  
  m_Path = _T("c:\\"); XQ%*U=)s  
  m_Number = _T("0 picture captured."); d1D{wZ3g  
  nCount=0; I(bH.{1n7  
  bRegistered=FALSE; `8KWZi4 ]  
  bTray=FALSE; UP 75}h9  
 //}}AFX_DATA_INIT Elh: %dr Q  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ke2'?,f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 'h.{fKG]ME  
} =Qp~@k=2  
$F`jM/B6  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) tB'F`HM:mq  
{ q[ ] "`?  
 CDialog::DoDataExchange(pDX); qeb:n$  
 //{{AFX_DATA_MAP(CCaptureDlg)  }aRV)F  
  DDX_Control(pDX, IDC_KEY, m_Key); b`PAOQ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Gyk>5Q}}  
  DDX_Check(pDX, IDC_ALT, m_bAlt); (SfP3  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 88$G14aXEk  
  DDX_Text(pDX, IDC_PATH, m_Path); d /+sR@\  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "$;=8O5O  
 //}}AFX_DATA_MAP ~*ZB2  
} =oV8 !d%]  
 ^GB9!d.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) nG1 mx/w  
//{{AFX_MSG_MAP(CCaptureDlg) 'bN\bbR  
 ON_WM_SYSCOMMAND() 6I.N:)=  
 ON_WM_PAINT() K@Twiw~rB  
 ON_WM_QUERYDRAGICON() @AvXBMq|  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |g}! F-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) P)XkqOGpT9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Hz`rw\\Xq  
//}}AFX_MSG_MAP M3Q#=yy$D$  
END_MESSAGE_MAP() E%:!* 9  
P>z k  
BOOL CCaptureDlg::OnInitDialog() \_#0Z+pX  
{ vtc} )s\  
 CDialog::OnInitDialog(); )@RTU~#  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); DQDt*Uj,  
 ASSERT(IDM_ABOUTBOX < 0xF000); U\&kT/6vh  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !:,d^L!bh  
 if (pSysMenu != NULL) :@I?JSi  
 { ?"$W=*P\o  
  CString strAboutMenu; /tikLJ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); y/K%F,WMf  
  if (!strAboutMenu.IsEmpty()) =3?t%l;n  
  { C0[Rf.*  
   pSysMenu->AppendMenu(MF_SEPARATOR); !u.{<51b  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); jJg9M'@2!  
  } iOm~  
 } g+hz>^Wg  
 SetIcon(m_hIcon, TRUE); // Set big icon mHE4Es0  
 SetIcon(m_hIcon, FALSE); // Set small icon YES!?^}  
 m_Key.SetCurSel(0); c|x:]W'ij  
 RegisterHotkey(); .^N+'g  
 CMenu* pMenu=GetSystemMenu(FALSE); ,-ZAI b*  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wh l)^D  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .r)WDR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AMA :hQ  
 return TRUE; // return TRUE unless you set the focus to a control yL^1s\<ddW  
} ={ c=8G8T  
Z`v6DfK}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) WM}:%T-  
{ %4Ylq|d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) k[R/RhHQ,  
 { -wtavv,J  
  CAboutDlg dlgAbout; -q[T0^e S  
  dlgAbout.DoModal(); oOy@X =cw  
 } b{)9 ?%_  
 else EMU~gwPR  
 { %}j.6'`{  
  CDialog::OnSysCommand(nID, lParam); W}EI gVHs  
 } cRs Lt/Wr  
} ca*USM  
I! {AWfp0  
void CCaptureDlg::OnPaint() B3@   
{ w~afQA>  
 if (IsIconic()) T5)Xl'Q  
 { x~!B.4gT2  
  CPaintDC dc(this); // device context for painting g2^7PtJg  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); kEf}yTy  
  // Center icon in client rectangle qEX2K^y'4"  
  int cxIcon = GetSystemMetrics(SM_CXICON); aDb@u3X@  
  int cyIcon = GetSystemMetrics(SM_CYICON); 9~I\WjB "  
  CRect rect; E^zgYkZO  
  GetClientRect(&rect); }>b4s!k,  
  int x = (rect.Width() - cxIcon + 1) / 2; xY(+[T!OF  
  int y = (rect.Height() - cyIcon + 1) / 2; ,w,>pO'[  
  // Draw the icon Nt,)5_K <  
  dc.DrawIcon(x, y, m_hIcon); xcnHj1r-o'  
 } x=Qy{eIe  
 else ~` @dI  
 { A9qCaq{  
  CDialog::OnPaint(); J0a]Wz%  
 } C6,GgDH`  
} B)O=wx  
?aEBS  
HCURSOR CCaptureDlg::OnQueryDragIcon() vP^]Y.6  
{ !;{@O`j?b  
 return (HCURSOR) m_hIcon; O*d&H;;  
} *_`T*$  
h?j;*|o-  
void CCaptureDlg::OnCancel() pRx^O F(3  
{ qGuz`&i  
 if(bTray) >aW|W!.  
  DeleteIcon(); %eT4Q~}5"  
  CDialog::OnCancel(); ^c83_93)R  
} T~cq=i|O  
$_k'!/5  
void CCaptureDlg::OnAbout() <*0MD6 $5  
{ %1gJOV  
 CAboutDlg dlg; tBtJRi(  
 dlg.DoModal(); @ v/%^  
} bR?-B>EB  
[6V'UI6  
void CCaptureDlg::OnBrowse() Ictc '#y  
{ 96]lI3 c  
 CString str; ^%~ztn 51  
 BROWSEINFO bi; rtvuAFiH  
 char name[MAX_PATH]; Y:&1;`FBZ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Oh6;o1UI  
 bi.hwndOwner=GetSafeHwnd(); k^Tu9}[W1  
 bi.pszDisplayName=name; AJ2Xq*fk  
 bi.lpszTitle="Select folder"; ItDe_|!L  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [@kzC/Jq3  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,a?)#X  
 if(idl==NULL) TSdjX]Kf  
  return; vF;6Y(h>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); MVjc.^  
 str.ReleaseBuffer(); ^8.R 'Yq  
 m_Path=str; L'6_~I  
 if(str.GetAt(str.GetLength()-1)!='\\') W0tBF&E"  
  m_Path+="\\"; .!KlN%As  
 UpdateData(FALSE); 1]A%lud4  
} *0i   
|4-c/@D.~  
void CCaptureDlg::SaveBmp() $ 8_t.~q  
{ -}{\C]%  
 CDC dc; &|%z!x6f  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); tH 5f;mY,  
 CBitmap bm; dS0G+3J&+E  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2c5>0f  
 int Height=GetSystemMetrics(SM_CYSCREEN); Mki(,Y|1~  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vnk"0d.  
 CDC tdc; S#jH2fRo  
 tdc.CreateCompatibleDC(&dc); ]j*o&6cQf  
 CBitmap*pOld=tdc.SelectObject(&bm); BS*cG>T  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); dLD"Cx  
 tdc.SelectObject(pOld); NxNR;wz>l  
 BITMAP btm; ~IE:i-Kz  
 bm.GetBitmap(&btm); PHfGl  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 1dfA 8=L,s  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )pr pG !  
 BITMAPINFOHEADER bih; 5zpk6FR$  
 bih.biBitCount=btm.bmBitsPixel; ~#I1!y~`  
 bih.biClrImportant=0; +SPC@E_v  
 bih.biClrUsed=0; ,U>g LTS  
 bih.biCompression=0; xVfJ ]Y  
 bih.biHeight=btm.bmHeight; /Ia=/Jj7N  
 bih.biPlanes=1; J9/9k  
 bih.biSize=sizeof(BITMAPINFOHEADER); Zdh4CNEeFP  
 bih.biSizeImage=size; BTjF^&`  
 bih.biWidth=btm.bmWidth; yu#Jw  
 bih.biXPelsPerMeter=0; C1p |.L?m  
 bih.biYPelsPerMeter=0; 6 Y&OG>_\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); &^9f)xb  
 static int filecount=0; Rr%]/%  
 CString name; }xLwv=Ia  
 name.Format("pict%04d.bmp",filecount++); &9o @x]) @  
 name=m_Path+name; tjDVU7um  
 BITMAPFILEHEADER bfh; xd(AUl4qY  
 bfh.bfReserved1=bfh.bfReserved2=0; xg'0YZ\t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ><\mt  
 bfh.bfSize=54+size; oVl:./(IB  
 bfh.bfOffBits=54; &\0LR?Nh  
 CFile bf; UY}lJHp0  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ *>_:E6)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); rZJp>Q)s  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); N:L<ySJ7  
  bf.WriteHuge(lpData,size); |8+<qgQ  
  bf.Close(); %*|XN*iXC  
  nCount++; ocdXzk`  
 } IFG`  
 GlobalFreePtr(lpData); {y<_S]0  
 if(nCount==1) CXUNdB  
  m_Number.Format("%d picture captured.",nCount); 7t@jj%F  
 else Fi7pq2  
  m_Number.Format("%d pictures captured.",nCount); _$cQAH0 E  
  UpdateData(FALSE); >^<qke  
} 50_%Tl[  
2jx""{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !vImmhI!I  
{ %}j/G l5  
 if(pMsg -> message == WM_KEYDOWN) diTzolY7  
 { *:YW@Gbm  
  if(pMsg -> wParam == VK_ESCAPE) _9L2JN$R6  
   return TRUE; N66jFRA;x  
  if(pMsg -> wParam == VK_RETURN) CuuHRvU8  
   return TRUE; >{m>&u;Cc  
 } Nkv2?o>l  
 return CDialog::PreTranslateMessage(pMsg); UKX'A)$  
} y99G3t  
<~:  g  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +?mZ_sf8w  
{ m1+DeXR_g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ o &Nr5S  
  SaveBmp(); bZ3CJ f&mE  
  return FALSE; ;K:.*sAa  
} H2k>E}`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ^]aDLjD  
 CMenu pop; iT.hXzPzr*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); dX+DE(y  
 CMenu*pMenu=pop.GetSubMenu(0); q=96Ci_a  
 pMenu->SetDefaultItem(ID_EXITICON); OsC1('4@  
 CPoint pt; _k ~bH\(  
 GetCursorPos(&pt); [bGdg  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); }]g>PY  
 if(id==ID_EXITICON) Cs*u{O  
  DeleteIcon(); 0D.YO<PU  
 else if(id==ID_EXIT) :+[q `  
  OnCancel(); CrqWlO  
 return FALSE; OM, uR3,  
} u9VJ{F  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I}?fy\1A&  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) lHP[WO  
 AddIcon();  Rl 6E  
 return res; Gia_B6*Y[  
} Qz/=+A/4  
_-^ KqNyy  
void CCaptureDlg::AddIcon() noL<pkks~R  
{ vk[Km[(U'  
 NOTIFYICONDATA data; }dB01Jl '  
 data.cbSize=sizeof(NOTIFYICONDATA); tSQ>P -O  
 CString tip; #kV= ;(lq  
 tip.LoadString(IDS_ICONTIP); @-u/('vpB  
 data.hIcon=GetIcon(0); ,T1 t`  
 data.hWnd=GetSafeHwnd(); Lww0LH >  
 strcpy(data.szTip,tip); iL5+Uf)E3  
 data.uCallbackMessage=IDM_SHELL; m3,]j\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [qid4S~r,&  
 data.uID=98; fv`%w  
 Shell_NotifyIcon(NIM_ADD,&data); \9D '7/$I,  
 ShowWindow(SW_HIDE); ot,<iE#za  
 bTray=TRUE; >B~p[wh0  
} 8 Z#)Xb4  
QEtZ]p1H@  
void CCaptureDlg::DeleteIcon() 1Rwk}wL  
{ tR2IjvmsX  
 NOTIFYICONDATA data; o1kLT@VCl  
 data.cbSize=sizeof(NOTIFYICONDATA); W~DY-;  
 data.hWnd=GetSafeHwnd(); c t,p?[Q  
 data.uID=98; %iF< px?Vc  
 Shell_NotifyIcon(NIM_DELETE,&data); @^%zh   
 ShowWindow(SW_SHOW); 4$vya+mAk5  
 SetForegroundWindow(); )e{~x u  
 ShowWindow(SW_SHOWNORMAL); -bKli<C  
 bTray=FALSE; HM--`RJ  
} (MbI8B>  
*S{%+1F  
void CCaptureDlg::OnChange() =|uX?  
{ Z mYp!B_~  
 RegisterHotkey(); \!s0VEE  
} Ku&0bXP  
SRj|XCd  
BOOL CCaptureDlg::RegisterHotkey() 5H?`a7q N  
{ TQbhK^]  
 UpdateData(); Ok O;V6`  
 UCHAR mask=0; +mV4Ty  
 UCHAR key=0; %'t~+_  
 if(m_bControl) "K~+T\^|k  
  mask|=4; o),i2  
 if(m_bAlt) }U+gJkY2  
  mask|=2; /[_>U{~P#  
 if(m_bShift) nvpdu)q<  
  mask|=1; tQ] R@i  
  key=Key_Table[m_Key.GetCurSel()]; GQ)hZt0  
 if(bRegistered){ DA[-( s  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); nG{j x_{`  
  bRegistered=FALSE; O/l|\n  
 } !L-.bve!  
 cMask=mask; '{U56^b]  
 cKey=key; &~^"yo#b  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); g8}/Ln*W'  
 return bRegistered; g24)GjDi  
} 8|V6RgA%  
Z]oa+W+  
  四、小结 --.:eFE/  
jw#'f%*  
  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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