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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: k`u:Cz#aB  
  L{i,.aE/nO  
  一、实现方法 [=otgVteN"  
|Nfi y  
  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: U`-]U2 "  
qFpRY7eq  
#pragma data_seg("shareddata") jQ 'r};;  
HHOOK hHook =NULL; //钩子句柄 >U2[]fu  
UINT nHookCount =0; //挂接的程序数目 :VB{@ED  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <h vVh9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 r\x"nS  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey `'gadCTb=  
static int KeyCount =0; REaU=-m-  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ~\ C.Nm  
#pragma data_seg() Js'#=  
g6wL\g{29  
  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。 4|EV`t}EV  
e ; #"t  
  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: Px$4.b[{_Y  
fz hCV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ZB|y  
cKey,UCHAR cMask) "F.0(<4)  
{ YR\pt8(z?  
 BOOL bAdded=FALSE; $v#\bqY  
 for(int index=0;index<MAX_KEY;index++){ WF!u2E+  
  if(hCallWnd[index]==0){ Kj+=?R~}S  
   hCallWnd[index]=hWnd; j1sZRl)D  
   HotKey[index]=cKey; ar#Xe;T!  
   HotKeyMask[index]=cMask; u5LrZt]k  
   bAdded=TRUE; .0gF&>I}  
   KeyCount++; 555*IT3b  
   break; F79!B  
  } QUSyVp{$  
 } lCznH?[  
 return bAdded; 4,yS7l  
} lls-Nir%  
//删除热键 ,Zs"r}G^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H`XE5Hk)P%  
{ ^kElb;d  
 BOOL bRemoved=FALSE; ZtFOIb*  
 for(int index=0;index<MAX_KEY;index++){ RdtF5#\z  
  if(hCallWnd[index]==hWnd){ L+rMBa  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ x KZLXQ'e-  
    hCallWnd[index]=NULL; gFx2\QV  
    HotKey[index]=0; 4)zHkN+  
    HotKeyMask[index]=0; HLa3lUo  
    bRemoved=TRUE; ~%8T_R/3  
    KeyCount--; 2^*a$ OJ  
    break; 4J"S?HsW|  
   } Km=dId7]  
  } .Zzx W  
 } jEkO #xI  
 return bRemoved; |v[0(  
} /&`sB|  
y7?n;3U]CS  
ioZ{2kK  
  DLL中的钩子函数如下: YKk*QcAn  
VPAi[<FzOG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ("+J*u*kq_  
{ Kpx(x0^2  
 BOOL bProcessed=FALSE; RF,[1O-\O  
 if(HC_ACTION==nCode) !pwY@} oL  
 { bIR&e E  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 04u^Q  
   switch(wParam) E5H0Yo.Wi  
   {  7 B<  
    case VK_MENU: :7&-<ae2  
     MaskBits&=~ALTBIT; f7mN,_Lt  
     break; +Ui @3Q  
    case VK_CONTROL: fC\Cx;q-  
     MaskBits&=~CTRLBIT; zK5/0zMZ  
     break; ZYi."^l  
    case VK_SHIFT: ev$\Ns^g$3  
     MaskBits&=~SHIFTBIT; C1V@\mRi  
     break; _(R1En1  
    default: //judge the key and send message p#yq'kY  
     break; ;nDCyn4i]  
   } 3kc.U  
   for(int index=0;index<MAX_KEY;index++){ zOEdFU{x  
    if(hCallWnd[index]==NULL) R;6$lO8C&  
     continue; m4=[e!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sX :)g>b   
    { ?hXeZB+b4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); VX;br1$X  
     bProcessed=TRUE; WFYbmfmV  
    } AxsTB9/  
   } 9;L5#/E  
  } fs:%L  
  else if((lParam&0xc000ffff)==1){ //有键按下 - s}  
   switch(wParam) ,/XeG`vk  
   { jIzkI)WC|  
    case VK_MENU: A$H;2T5N  
     MaskBits|=ALTBIT; mn>$K"_k  
     break; ~g6`Cp`  
    case VK_CONTROL: a (mgz&*  
     MaskBits|=CTRLBIT; )yOdRRP  
     break; ++HHUM  
    case VK_SHIFT: \Y4>_Mk  
     MaskBits|=SHIFTBIT; 3 W%Bsqn  
     break; i$[wkQ>$  
    default: //judge the key and send message Al 0 i{.V  
     break; `[&) X  
   } 5f` a7R  
   for(int index=0;index<MAX_KEY;index++){ GmONhh(k  
    if(hCallWnd[index]==NULL) y,.X5#rnX*  
     continue; P Tc@MH)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h^)R}jy+f  
    { FS(bEAk}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hhqSfafUX  
     bProcessed=TRUE; vjzpU(Sq#  
    } ;VL v2J*  
   } e\[z Q 2Z3  
  } 24}?GO  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 S~ff<A>f  
   for(int index=0;index<MAX_KEY;index++){ %ja8DRQ.  
    if(hCallWnd[index]==NULL) e Qz_,vTk  
     continue; _N-.=86*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !bPsJbIo>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T[z}^"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 g?}$"=B   
   } l$1z%|I  
  } /F(wb_!  
 } JFJ_ PphvD  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z`?{5v -Qs  
} `ZC{<eVJ}=  
#JOWiO0>  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: D.i(Irqw!  
5 aT>8@$Z^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); o `]o(OP  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \L-K}U>J  
FRSz3^Aw  
  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: w`N|e0G@  
BotGPk><c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~=!d>f~U  
{ "M GX(SQ  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) sW53g$`v  
 { H(JgqbFB*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 +5zLQ>]z  
  SaveBmp(); d-W@/J  
  return FALSE; T;4& ^5 n  
 } t7t?xk!2  
 …… //其它处理及默认处理 ~)Z MGx  
} 8Moe8X#3  
iEA$`LhO\A  
)YKnFSm  
  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。  [YGPcGw  
WT-BHB1  
  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。 )*b dG'}  
*Y4[YnkPE  
  二、编程步骤 FuWMVT`Y  
yU e7o4Zm  
  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"; ^-*q  
l@h|os  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; MM+xm{4l  
&gDwsW  
  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; Ew&pwsQ  
*FINNNARB  
  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; efc<lSUR  
?)Psf/  
  5、 添加代码,编译运行程序。 W -pN  
C\Y%FTS:  
三、程序代码 +*O$]Hh  
>nqDUGnEo>  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL H}Jdnu|ko  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) &gP/<!#  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ a5)<roWQ  
#if _MSC_VER > 1000 up# R9 d|  
#pragma once b`lLqV<[cB  
#endif // _MSC_VER > 1000 >q}Ns^ .'  
#ifndef __AFXWIN_H__ d4 Hpe>  
#error include 'stdafx.h' before including this file for PCH I 3ZlKI  
#endif %![%wI?  
#include "resource.h" // main symbols E8Rk b}  
class CHookApp : public CWinApp Ih&rXQ$  
{ /K@_O\+;Q  
 public: q& :UP  
  CHookApp(); y1oQ4|KSI  
  // Overrides " h D6Z  
  // ClassWizard generated virtual function overrides EJ%Kr$51K  
  //{{AFX_VIRTUAL(CHookApp) ?!uj8&yyf  
 public: 4 8}\  
  virtual BOOL InitInstance(); $N}nO:`t  
  virtual int ExitInstance(); Z4"SKsJT/>  
  //}}AFX_VIRTUAL 65P*Gu?  
  //{{AFX_MSG(CHookApp) &B3[:nS2  
  // NOTE - the ClassWizard will add and remove member functions here. ( <Abw{BTm  
  // DO NOT EDIT what you see in these blocks of generated code ! <hJ%]]  
  //}}AFX_MSG aX)k (*|  
  DECLARE_MESSAGE_MAP() (i 3=XfZ!C  
}; fcim4dfP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^|P/D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -$x5[6bN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); prdlV)LTpY  
BOOL InitHotkey(); ]]EOCGZ"  
BOOL UnInit(); $=IJ-_'o  
#endif 6*{sZMG  
3eg)O34  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 8Hdm(>  
#include "stdafx.h" <$V!y dO  
#include "hook.h" w;p: 4`  
#include <windowsx.h> hHu?%f*  
#ifdef _DEBUG }#b[@3/T  
#define new DEBUG_NEW oB$P6   
#undef THIS_FILE 4@Q`8N.  
static char THIS_FILE[] = __FILE__; "B$r{ vG  
#endif =vpXYj  
#define MAX_KEY 100 ,4OH9 -Q1  
#define CTRLBIT 0x04 ]"*sp  
#define ALTBIT 0x02 "1-gMob  
#define SHIFTBIT 0x01 (]Pr[xB  
#pragma data_seg("shareddata") ++m^z` D  
HHOOK hHook =NULL; snH9@!cG8  
UINT nHookCount =0; 77]6_  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Z [aKic  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT pZ IDGy=~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3YFbT Z  
static int KeyCount =0; n/&}|998?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Cuk!I$  
#pragma data_seg() ?k}"g$JFn  
HINSTANCE hins; jQV.U~25Q  
void VerifyWindow(); wqZ*$M   
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) k;fy8  
//{{AFX_MSG_MAP(CHookApp) C{5bG=Sg~  
// NOTE - the ClassWizard will add and remove mapping macros here. R9!GDKts%  
// DO NOT EDIT what you see in these blocks of generated code! ; xz}]@]Ar  
//}}AFX_MSG_MAP O1 KT  
END_MESSAGE_MAP() Z ZMz0^V  
,drcJ  
CHookApp::CHookApp() tn\PxT  
{ ;7HL/-  
 // TODO: add construction code here, C<T)'^7z  
 // Place all significant initialization in InitInstance w.:fl4V  
} kf Xg\6uKc  
QMI6l'"s  
CHookApp theApp; ]bui"-tlK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;ATn&  
{ _ Cu,"  
 BOOL bProcessed=FALSE; ]9 ArT$  
 if(HC_ACTION==nCode) D2@J4;UW*W  
 { O 8\wH  
  if((lParam&0xc0000000)==0xc0000000){// Key up )[Bl3+'  
   switch(wParam) m j!P ]  
   { uQ_s$@brI  
    case VK_MENU: _'.YC<;  
     MaskBits&=~ALTBIT; *oW^P~m/  
     break; mDG=h6y"V  
    case VK_CONTROL: hb,G'IU  
     MaskBits&=~CTRLBIT; ({5`C dVi  
     break; `El)uTnuZ[  
    case VK_SHIFT: T+q3]&  
     MaskBits&=~SHIFTBIT; H;=JqD8`  
     break; p_Yx"nO7  
    default: //judge the key and send message `nvm>u~[Hq  
     break; &y~~Z [.F,  
   } 7R{(\s\9:  
   for(int index=0;index<MAX_KEY;index++){ ($vaj;  
    if(hCallWnd[index]==NULL) b14WIgjsl  
     continue; Ibbpy++d[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z7G l^4zn  
    { d$;1%rRj8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); v< Ozr:lL  
     bProcessed=TRUE; |#Q4e51H  
    } #% 1|$V*:  
   } /ll2lyS+  
  } o=}vK[0u  
  else if((lParam&0xc000ffff)==1){ //Key down $yi[wwf 4  
   switch(wParam)  Bm\OH#  
   { Tg-HR8}X  
    case VK_MENU: ^gu;  
     MaskBits|=ALTBIT; >~vZ+YO  
     break; Di^7@}kQS  
    case VK_CONTROL: H*H=a  
     MaskBits|=CTRLBIT; g3h:oQCS  
     break; ]CnqPLqL  
    case VK_SHIFT: -:P`Rln  
     MaskBits|=SHIFTBIT; R3<2Z0lqy  
     break; (U GmbRf&  
    default: //judge the key and send message >+3tOv3:  
     break; w<o#/J9  
   } [? 1m6u;  
   for(int index=0;index<MAX_KEY;index++) YZHqy++x  
   { /yd<+on^  
    if(hCallWnd[index]==NULL) f:K3 P[|  
     continue; IW&.JNcN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) "x"y3v'  
    { h{BO\^6x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6tDCaB  
     bProcessed=TRUE; _XP3|E;I/  
    } pRTdP/(OQ  
   } Sd\+f6x  
  } b- FJMY  
  if(!bProcessed){ 'y<<ce*   
   for(int index=0;index<MAX_KEY;index++){ 3v:c".O2O  
    if(hCallWnd[index]==NULL) J_tI]?jrU  
     continue; l4LowV7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) % QKlvmI"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uTq)Ets3  
   } &l| :1  
  } `B GU  
 } a=%QckR*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); oKlOcws}  
} NW*qw q  
 (r!d4  
BOOL InitHotkey() Fu/{*4  
{ j\^ u_D  
 if(hHook!=NULL){ V!3.MQM  
  nHookCount++; =#Qm D=  
  return TRUE; rf:C B&u  
 } Jemb0Qv  
 else |-'.\)7:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); KJ]ejb$  
  if(hHook!=NULL) /EXub U73  
   nHookCount++; {W5D)  
  return (hHook!=NULL); l*0`{R  
} TXDb5ZCzM  
BOOL UnInit() j1hx{P'  
{ CNRiK;nQ  
 if(nHookCount>1){ ,VTX7vaH  
  nHookCount--; j}dev pO  
  return TRUE; VJ'bS9/T  
 } <e%~K4KH  
 BOOL unhooked = UnhookWindowsHookEx(hHook); H5 'Le{  
 if(unhooked==TRUE){ ?\J.Tv $$$  
  nHookCount=0; Pqc +pE  
  hHook=NULL; .}6Mj]7?i  
 } DX$zzf  
 return unhooked; qt !T%K  
}  =>Md>VM  
A8by5qU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g0n 5&X  
{ c{SD=wRt,y  
 BOOL bAdded=FALSE; 4\?GA`@  
 for(int index=0;index<MAX_KEY;index++){ C $r]]MSj  
  if(hCallWnd[index]==0){ G'\x9%  
   hCallWnd[index]=hWnd; *wY { ~zh  
   HotKey[index]=cKey; nOE 1bf^l  
   HotKeyMask[index]=cMask; $sTvXf:g  
   bAdded=TRUE; kl90w  
   KeyCount++; 5 Y|(i1  
   break; Ksu_4dE  
  } /t<C_lLM  
 }  #VA8a=t  
 return bAdded; *G,'V,?  
} $kM8E@x2  
uSRvc0R\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 'J=knjAT  
{ 6'^Gh B  
 BOOL bRemoved=FALSE; UVIR P#  
 for(int index=0;index<MAX_KEY;index++){ +#/`4EnI  
  if(hCallWnd[index]==hWnd){ O@gHx!L  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \a|bx4M  
    hCallWnd[index]=NULL; O(Tdn;1  
    HotKey[index]=0; =yZiBJ  
    HotKeyMask[index]=0; 01-n_ $b  
    bRemoved=TRUE; Oy `2ccQ#  
    KeyCount--; (fYrb# ]!y  
    break; ?g5u#Q> !  
   } ONkHHyT  
  } M\f1]L|8d  
 } 4X prVB  
 return bRemoved; U'8ub(:&  
} \1p_6U7  
=`oQcIkz  
void VerifyWindow() ,PyA$Z  
{ \EC=#E(  
 for(int i=0;i<MAX_KEY;i++){ )Fo1[:_B '  
  if(hCallWnd!=NULL){ h"-}BjL  
   if(!IsWindow(hCallWnd)){ <g^!xX<r?  
    hCallWnd=NULL; Owa]ax5  
    HotKey=0; 3?"JFfYU,'  
    HotKeyMask=0; NP {O  
    KeyCount--; >cEB ,@~  
   } D}| 30s?u1  
  } Zk4(  
 } q[}[w!to  
} b)eKa40Z  
A`D^}F6  
BOOL CHookApp::InitInstance() rLfhm Ds%u  
{ eZr}xo@9  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); mR? } gR  
 hins=AfxGetInstanceHandle(); V(Dn!Nz  
 InitHotkey(); >;;tX3(  
 return CWinApp::InitInstance(); _cW (R,i  
} Yp_R+a^  
9b0M'x'W5  
int CHookApp::ExitInstance() M_4:~&N$  
{ $2M dxw5  
 VerifyWindow(); 5G-}'-R  
 UnInit(); zJp@\Yo+  
 return CWinApp::ExitInstance(); A|D]e)/6+B  
} }#rdMh  
4G%!t`? q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~<%/)d0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -C7IUat<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8-wW?YTG  
#if _MSC_VER > 1000 Px>Gc:!>  
#pragma once jmAQ!y|W.  
#endif // _MSC_VER > 1000 RRNoX }  
QqC4g]  
class CCaptureDlg : public CDialog Eoj 2l&\  
{ 'Gw;@[  
 // Construction CulU?-[i  
 public: \rw/d5.  
  BOOL bTray; ma\UJz  
  BOOL bRegistered; `xhiG9mz~  
  BOOL RegisterHotkey(); 2nQrCdRC  
  UCHAR cKey; ww]^H$In  
  UCHAR cMask; G2nL#l~@)  
  void DeleteIcon(); B~_='0Gm[  
  void AddIcon(); ;gh#8JkI  
  UINT nCount; w :w  
  void SaveBmp(); + !I7(gL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xz+Y1fYT  
  // Dialog Data $=c79Al(  
  //{{AFX_DATA(CCaptureDlg) A-GRuC  
  enum { IDD = IDD_CAPTURE_DIALOG }; NdS6j'%B@7  
  CComboBox m_Key; T/_JXK>W  
  BOOL m_bControl; Y!kz0([  
  BOOL m_bAlt; *hHy> (*  
  BOOL m_bShift; ,u^S(vxyz  
  CString m_Path; V0gk8wD  
  CString m_Number; Ch1+YZG  
  //}}AFX_DATA lD8&*5tDmP  
  // ClassWizard generated virtual function overrides 5PJB<M_m:  
  //{{AFX_VIRTUAL(CCaptureDlg) &?@gUk74"  
 public: XcS 8{  
  virtual BOOL PreTranslateMessage(MSG* pMsg); PC_#kz  
 protected: ? 9.V@+i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support p<|I!n&9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); a:o Z5PX=  
  //}}AFX_VIRTUAL Sv7_-#SW<(  
  // Implementation FA.h?yfr  
 protected: ; )Vro  
  HICON m_hIcon; s7FJJTn  
  // Generated message map functions N F[v/S  
  //{{AFX_MSG(CCaptureDlg) _u`NIpXSP  
  virtual BOOL OnInitDialog(); s_=/p5\  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~=Y <B/  
  afx_msg void OnPaint(); ICD(#m  
  afx_msg HCURSOR OnQueryDragIcon(); {QTrH-C  
  virtual void OnCancel(); :%dIX}F  
  afx_msg void OnAbout(); >b |TaQ  
  afx_msg void OnBrowse(); UC,43 z  
  afx_msg void OnChange(); VOYuog 5o  
 //}}AFX_MSG /`3^?zlu"  
 DECLARE_MESSAGE_MAP() )p-B@5bb  
}; r@xMb,!H  
#endif o b  
_jw A_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file kF9T 9  
#include "stdafx.h" ,KlTitJl\+  
#include "Capture.h" 3dnL\AqC  
#include "CaptureDlg.h" g& y R-  
#include <windowsx.h> c3gy{:lb  
#pragma comment(lib,"hook.lib") M-!eL<  
#ifdef _DEBUG 41<.e` {  
#define new DEBUG_NEW zfE;)K^"  
#undef THIS_FILE aW8Bx\q  
static char THIS_FILE[] = __FILE__; ?-g=Rfpag  
#endif OQ$77]XtvL  
#define IDM_SHELL WM_USER+1 Jlw oSe:S  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wX6VapFboI  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3z[yKua\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; iQczvn)"m  
class CAboutDlg : public CDialog <qzHMy Ai  
{ 27-<q5q  
 public: um@RaU  
  CAboutDlg(); zaX!f ~;"  
  // Dialog Data *f~X wy"  
  //{{AFX_DATA(CAboutDlg) /;M0tP  
  enum { IDD = IDD_ABOUTBOX }; GNXQD}L?b?  
  //}}AFX_DATA TxhTK5#f  
  // ClassWizard generated virtual function overrides ,w|f*L$  
  //{{AFX_VIRTUAL(CAboutDlg) uc?QS~H&w  
 protected: k;p:P ?s5Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H1uNlPT  
  //}}AFX_VIRTUAL MOJ-q3H^W  
  // Implementation 6&=xu|M<x=  
 protected: ]@op  
  //{{AFX_MSG(CAboutDlg) (9h{7<wD`  
  //}}AFX_MSG Aa;R_Jz  
  DECLARE_MESSAGE_MAP() D-.XSIEMu  
}; Ox"4 y  
?aInn:FE  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) +]Oq{v:e  
{ Q)}sX6TB  
 //{{AFX_DATA_INIT(CAboutDlg) "Hmo`EB0  
 //}}AFX_DATA_INIT NDhHU#Q9  
} WigC'  
>JFAE5tj&2  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @]Ye36v0#L  
{ hu-fwBK  
 CDialog::DoDataExchange(pDX); byM/LE7)  
 //{{AFX_DATA_MAP(CAboutDlg) \oPW  
 //}}AFX_DATA_MAP NYD#I{h  
} [{_JO+)+n  
6uQfe? aD  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9hI4',(rE  
 //{{AFX_MSG_MAP(CAboutDlg) o}p6qB=;1  
 // No message handlers YJ]]6 K+  
 //}}AFX_MSG_MAP KIdlndGs  
END_MESSAGE_MAP() 6Flc4L8JU  
 tFvti5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :8U=L'4  
: CDialog(CCaptureDlg::IDD, pParent) 0-EhDGa]r  
{ |b'fp1</  
 //{{AFX_DATA_INIT(CCaptureDlg) + )?1F  
  m_bControl = FALSE; >?yaG=  
  m_bAlt = FALSE; q('O@-HA  
  m_bShift = FALSE; oUEpzv,J  
  m_Path = _T("c:\\"); 3Juhn5&N  
  m_Number = _T("0 picture captured."); MJ >9[hs  
  nCount=0; xaWd \]UF  
  bRegistered=FALSE; }U'fPYYi8  
  bTray=FALSE; yqqP7  
 //}}AFX_DATA_INIT m~\BkE/[l  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e9h T  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Kz!-w  
} p^+k:E>U  
MP?9k)f  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1i9}mzy%  
{ -[~UX!XFM  
 CDialog::DoDataExchange(pDX); .O'S@ %]  
 //{{AFX_DATA_MAP(CCaptureDlg) Yt2_*K@rC  
  DDX_Control(pDX, IDC_KEY, m_Key); eJ>(SkR:[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |sHIT<=m  
  DDX_Check(pDX, IDC_ALT, m_bAlt); .x$+ 7$G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >t u3m2  
  DDX_Text(pDX, IDC_PATH, m_Path); J'y*;@4l^:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5<Cu-X  
 //}}AFX_DATA_MAP Ul OoMGg  
} m.-l&@I2/<  
l%lkDh!$"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0 8vA;6zt  
//{{AFX_MSG_MAP(CCaptureDlg) W,YzD&f=uS  
 ON_WM_SYSCOMMAND() V4f ~#Tp  
 ON_WM_PAINT() g ZhE\  
 ON_WM_QUERYDRAGICON() noa?p&Y1m  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) [g/Hf(&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) '=@O]7o~  
 ON_BN_CLICKED(ID_CHANGE, OnChange) {) 4D1  
//}}AFX_MSG_MAP :{%6< j  
END_MESSAGE_MAP() O'U0Y8HN  
2t\a/QE)E  
BOOL CCaptureDlg::OnInitDialog() 3> -/sii  
{ |)i- c`x  
 CDialog::OnInitDialog(); Y1txI  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); gm9e-QIHK  
 ASSERT(IDM_ABOUTBOX < 0xF000); \?h +  
 CMenu* pSysMenu = GetSystemMenu(FALSE); #B|`F?o  
 if (pSysMenu != NULL) =)"60R7{  
 { .Nr}V.?57  
  CString strAboutMenu; |vA3+kG  
  strAboutMenu.LoadString(IDS_ABOUTBOX); T5,/;e  
  if (!strAboutMenu.IsEmpty()) <r.f ?chf  
  { iSo+6gu   
   pSysMenu->AppendMenu(MF_SEPARATOR); e2;19bj&  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Ua\g*Cxh  
  } 2pH2s\r<UJ  
 } 3Z NYR'  
 SetIcon(m_hIcon, TRUE); // Set big icon !NK8_p|X  
 SetIcon(m_hIcon, FALSE); // Set small icon EUmQn8  
 m_Key.SetCurSel(0); .Ff;St  
 RegisterHotkey(); XCoN!~  
 CMenu* pMenu=GetSystemMenu(FALSE); ho ?.\Jq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -MJ6~4k2  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND);  9mwL\j  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); j% !   
 return TRUE; // return TRUE unless you set the focus to a control ;^lVIS%&{  
} `4}zB#3  
,*a8]L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) qS>P,>C  
{ >Be PE(k  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) <^|8\<J  
 { jwyJ=W-  
  CAboutDlg dlgAbout; BgJ;\NV  
  dlgAbout.DoModal(); /A[AHJ<[?  
 } y _>HQs,:  
 else ;2@MPx  
 { {-J/ <a@  
  CDialog::OnSysCommand(nID, lParam); Wk$[;>NU3  
 } '81$8xxdY  
} ,sP7/S)FR  
qbu Lcy3  
void CCaptureDlg::OnPaint() #*j  
{ {l.) *#O  
 if (IsIconic()) 1$?O5.X:  
 { 5W>i'6*  
  CPaintDC dc(this); // device context for painting yp wVzCUG  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); A5z`_b4f  
  // Center icon in client rectangle K=M5d^K<E  
  int cxIcon = GetSystemMetrics(SM_CXICON); Yq4_ss'nB  
  int cyIcon = GetSystemMetrics(SM_CYICON); .<^dv?@  
  CRect rect; l~AmHw e  
  GetClientRect(&rect); ,* ?bET $  
  int x = (rect.Width() - cxIcon + 1) / 2; k]`I 3>/L  
  int y = (rect.Height() - cyIcon + 1) / 2; Sb>;k(;`:  
  // Draw the icon .1 .n{4z>:  
  dc.DrawIcon(x, y, m_hIcon); 0vQ@n7  
 } fOm=#:O  
 else pY!@w0.  
 { 0^*4LM|z  
  CDialog::OnPaint(); j! iimdq  
 } &!2 4l=!  
} ae{% * \J  
pq#Hca[  
HCURSOR CCaptureDlg::OnQueryDragIcon() > YKvwbCf8  
{ <w+K$WE {  
 return (HCURSOR) m_hIcon; HGs.v}@&  
} v0jRoE#  
E).N u  
void CCaptureDlg::OnCancel() 7ml,  
{ ? Sj,HLo@U  
 if(bTray) [m?eSq6e2b  
  DeleteIcon(); <`9Q{~*=t  
  CDialog::OnCancel(); )i0\U  
} M'$n".,p  
WM*[+8h  
void CCaptureDlg::OnAbout() |0ACapp!  
{ c>:}~.~T  
 CAboutDlg dlg; ,m{Zn"?kS  
 dlg.DoModal(); ]L^X}[SH  
} l131^48U  
5Lo{\7%  
void CCaptureDlg::OnBrowse() =<y$5"|  
{ mNc (  
 CString str; :@KWp{ D7  
 BROWSEINFO bi; `XB(d@%  
 char name[MAX_PATH]; *e H[~4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ;<Oe\X  
 bi.hwndOwner=GetSafeHwnd(); {kD|8["Ie'  
 bi.pszDisplayName=name; R}8!~Ma`|  
 bi.lpszTitle="Select folder"; `LVItP(GUM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; &Zs h-|N  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {vx{Hwyv  
 if(idl==NULL) aDm$^yP  
  return; z ,87;4-  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }N#jA yp!  
 str.ReleaseBuffer(); s7tNAj bgD  
 m_Path=str; 15 x~[?!  
 if(str.GetAt(str.GetLength()-1)!='\\') d2&sl(O  
  m_Path+="\\"; `][~0\Y3m  
 UpdateData(FALSE); 6vQAeuz<Fq  
} KVvIo1$N  
 MScjq  
void CCaptureDlg::SaveBmp() D@rOX(m  
{ eY"y[  
 CDC dc; `E8m> q Ss  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); eVjr/nm  
 CBitmap bm; 6{8qATLR  
 int Width=GetSystemMetrics(SM_CXSCREEN); q*{i/=~  
 int Height=GetSystemMetrics(SM_CYSCREEN); )Uw QsP  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :[#HP66[O5  
 CDC tdc; r4@!QR<h  
 tdc.CreateCompatibleDC(&dc); dz5a! e [  
 CBitmap*pOld=tdc.SelectObject(&bm); "S(m1L?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); &"BmCDOq  
 tdc.SelectObject(pOld); ?=dyU(  
 BITMAP btm; &Y\Vh}  
 bm.GetBitmap(&btm); ELk$ lm&@  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {oy(08 `6  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8iB1a6TlL  
 BITMAPINFOHEADER bih; 8E H# IiP  
 bih.biBitCount=btm.bmBitsPixel; sycN  
 bih.biClrImportant=0; u3R0_8 _.w  
 bih.biClrUsed=0; "pa5+N&2-  
 bih.biCompression=0; Vz1ro  
 bih.biHeight=btm.bmHeight; lj/ ?P9  
 bih.biPlanes=1; i*:lZeU61  
 bih.biSize=sizeof(BITMAPINFOHEADER); v}Gq.(b  
 bih.biSizeImage=size; r50}j  
 bih.biWidth=btm.bmWidth; >k<.bEx(A  
 bih.biXPelsPerMeter=0; ?5K.#>{  
 bih.biYPelsPerMeter=0; FTI[YR8?Y  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5JK{dis]k  
 static int filecount=0; b7E= u0  
 CString name; Bcg\p}  
 name.Format("pict%04d.bmp",filecount++); '!]ry<  
 name=m_Path+name; oL1m<cQo9  
 BITMAPFILEHEADER bfh; eh2w7 @7Q  
 bfh.bfReserved1=bfh.bfReserved2=0; ,DqI> vx|  
 bfh.bfType=((WORD)('M'<< 8)|'B'); n,hHh=.Fu  
 bfh.bfSize=54+size; HDvj{  
 bfh.bfOffBits=54; pa N )t  
 CFile bf; 1Cki}$k@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ]sE~gro  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); (NyS2 `  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); , ?WTX  
  bf.WriteHuge(lpData,size); 1@" eeR  
  bf.Close(); J [J,  
  nCount++; @QV|<NeH  
 } \CM/KrCR  
 GlobalFreePtr(lpData); Ytmt+9  
 if(nCount==1) o/@.*Rj>Bg  
  m_Number.Format("%d picture captured.",nCount); 'b]GcAL  
 else '*MNRduE6  
  m_Number.Format("%d pictures captured.",nCount);  ]hpocr  
  UpdateData(FALSE); tu#VZAPW@  
} ),v[.9!}:  
/Z';# G,z  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) wQgW9546  
{ <%#M&9d)E  
 if(pMsg -> message == WM_KEYDOWN) F-k3'eyY  
 { AYeA)jk  
  if(pMsg -> wParam == VK_ESCAPE) 51W\%aB  
   return TRUE; l3R`3@  
  if(pMsg -> wParam == VK_RETURN) ;g?oU "YM  
   return TRUE; JOS,>;;F4  
 } |GM?4'2M.  
 return CDialog::PreTranslateMessage(pMsg); ><}FyK4C  
} &?f{.  
&%+}bt5  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) T~J6(,"  
{ R(@B4M2  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,-myR1}  
  SaveBmp(); ^s\(2lB\F  
  return FALSE; aFjcyD  
} Ki(qA(r  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d@#!,P5 `  
 CMenu pop; @G+Hrd6  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); <f %JZ4p*  
 CMenu*pMenu=pop.GetSubMenu(0); xPWzm hF  
 pMenu->SetDefaultItem(ID_EXITICON); !*HH5qh6  
 CPoint pt; TUHC[#Vb?  
 GetCursorPos(&pt); f]L`^WU  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /5 B{szf  
 if(id==ID_EXITICON) >p [|U`>{  
  DeleteIcon(); %W~Kx_  
 else if(id==ID_EXIT) L}UJ`U  
  OnCancel(); vQ>x5\r5O_  
 return FALSE; 0+jR,5 |  
} :CH "cbo  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); yoGe^gar  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~UA-GWb  
 AddIcon(); N3 .!E|  
 return res; =kH7   
} DygMavA.  
Q*&>Ui[&  
void CCaptureDlg::AddIcon() s%z\szd*  
{ A&*lb7X  
 NOTIFYICONDATA data; ()e.J  
 data.cbSize=sizeof(NOTIFYICONDATA); ,X25-OFZ  
 CString tip; ,V'+16xW  
 tip.LoadString(IDS_ICONTIP); izy7. (.a  
 data.hIcon=GetIcon(0); Tqz{{]%j~$  
 data.hWnd=GetSafeHwnd(); :# s 6,  
 strcpy(data.szTip,tip); bO]^TRaiJ  
 data.uCallbackMessage=IDM_SHELL; MlaViw  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &b8Dy=#  
 data.uID=98; =># S7=  
 Shell_NotifyIcon(NIM_ADD,&data); Kmc*z (Q  
 ShowWindow(SW_HIDE); Aw9se"d  
 bTray=TRUE; z )s{>^D  
} W+36"?*k3  
Q]]}8l2  
void CCaptureDlg::DeleteIcon() 0h/gqlTK1  
{ T;K@3]FbX  
 NOTIFYICONDATA data; E/2kX3}  
 data.cbSize=sizeof(NOTIFYICONDATA); O32p8AxEz  
 data.hWnd=GetSafeHwnd(); 'Vq <;.A  
 data.uID=98; ^ZV1Ev8T6  
 Shell_NotifyIcon(NIM_DELETE,&data); (7^5jo[D  
 ShowWindow(SW_SHOW); 1"? 3l`i  
 SetForegroundWindow(); Sm(X/P=z  
 ShowWindow(SW_SHOWNORMAL); )'3(=F$+l  
 bTray=FALSE; 4XpW#>  
} :tU&d(8  
-9TNU7^  
void CCaptureDlg::OnChange() \H|tc#::{  
{ d/5i4g[q  
 RegisterHotkey(); /.B7y(  
} x O?w8*d  
8oiO:lyLSt  
BOOL CCaptureDlg::RegisterHotkey() p vone,y2  
{ kx&Xk0F_g  
 UpdateData(); t`=TonLb8  
 UCHAR mask=0; PDQC^2Z  
 UCHAR key=0; jkCa2!WQ'i  
 if(m_bControl) C^9G \s'  
  mask|=4; c-3-,pyM_T  
 if(m_bAlt) Ks'msSMC  
  mask|=2; reseu*5  
 if(m_bShift) h&@ A'om~  
  mask|=1; ZGO% lkZ.  
  key=Key_Table[m_Key.GetCurSel()]; 0?OTa<c  
 if(bRegistered){ $I*ye+a*{q  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :cU6W2EV  
  bRegistered=FALSE; I/4:SNha  
 } "2} {lu  
 cMask=mask; <%w)EQf4m  
 cKey=key; qd$Y"~Mco  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [Q+8Ku  
 return bRegistered; F]o&m::/K  
} SNqw 2f5  
;[@);-9q  
  四、小结 q)0?aL  
Xq:jp+WSG  
  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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