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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: IW#(ICeb  
  gc=e)j@  
  一、实现方法 88K*d8m  
ep!.kA=\  
  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: (`p(c;"*C!  
/$=^0v +  
#pragma data_seg("shareddata") zyr6Tv61U  
HHOOK hHook =NULL; //钩子句柄 U&XoT-p$L  
UINT nHookCount =0; //挂接的程序数目 ]VME`]t`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 `jHGNi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 fjFy$NX&>  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey =jN]ckn  
static int KeyCount =0; WToAT;d2h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]*|K8&jxl  
#pragma data_seg() ;'p'8lts  
h]#)41y<  
  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。 * y B-N;I  
K0\WN"ua;  
  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: y)}aySQK^  
:]s] =q&]  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR D/WS  
cKey,UCHAR cMask) {JgN^R<5<f  
{ OOCeZ3yF(  
 BOOL bAdded=FALSE; &}cie"\L  
 for(int index=0;index<MAX_KEY;index++){ DbN'b(+  
  if(hCallWnd[index]==0){ Q  [{vU  
   hCallWnd[index]=hWnd; 4=Ey\Px  
   HotKey[index]=cKey; 1|VJND  
   HotKeyMask[index]=cMask; H.L@]~AyL  
   bAdded=TRUE; `{Jb{L@f  
   KeyCount++; 0FOf *Lz  
   break; $#r(1 Ev  
  } 1N+#(<x@,  
 } Sx2j~(pOr  
 return bAdded; IoA;q)  
} BR2y1Hfi  
//删除热键 YYHm0pc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z@i4dC  
{ y#+o*(=fRE  
 BOOL bRemoved=FALSE; ?la_ +;m  
 for(int index=0;index<MAX_KEY;index++){ * 5n:+Tw(  
  if(hCallWnd[index]==hWnd){ J%)2,szn0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p2G8 Qls  
    hCallWnd[index]=NULL; .D .Rn/  
    HotKey[index]=0; "}! rM6 h  
    HotKeyMask[index]=0; {76!  
    bRemoved=TRUE; SOmn2 }   
    KeyCount--; ^ne8~ ;Q  
    break; 7,TWCVap  
   } M lFvDy  
  } jGn^<T\  
 } Qx;A; n!lw  
 return bRemoved; 7o. 'F  
} %jk PrI  
}El_.@'T &  
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  DLL中的钩子函数如下: cy4'q ?r  
TpgBS4q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) &pm{7nH  
{ `qTY  
 BOOL bProcessed=FALSE; TeJ `sJ  
 if(HC_ACTION==nCode) cAS_?"V a  
 { R6;>RRU_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {O) &5  
   switch(wParam) W#j,{&KVn  
   {  SK52.xXJ  
    case VK_MENU: 4Z }{hc\J  
     MaskBits&=~ALTBIT; 1 1CJT  
     break; s?k[_|)!  
    case VK_CONTROL: / JB4#i7  
     MaskBits&=~CTRLBIT; )*h~dx_cm  
     break; )_cv}.xe  
    case VK_SHIFT: @ WaYU  
     MaskBits&=~SHIFTBIT; 9eiBj  
     break; l,wN@Nk  
    default: //judge the key and send message N_D+d4@  
     break; L?x?+HPY.  
   } Z@!W? Ed  
   for(int index=0;index<MAX_KEY;index++){ : !3y>bP)  
    if(hCallWnd[index]==NULL) Nl`ry2"<  
     continue; C4]%pi  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5#.\pR{Gd  
    { vc #oALc&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); cg0 0t+  
     bProcessed=TRUE; YS~t d+*  
    } 9Z'eBp  
   } rz{'X d  
  } ?(yFwR,(  
  else if((lParam&0xc000ffff)==1){ //有键按下 w9$8t9$|  
   switch(wParam) T+RI8.#o  
   { '*u;:[73  
    case VK_MENU: + f!,K  
     MaskBits|=ALTBIT; F|TMpH/  
     break; "R@N|Qx'  
    case VK_CONTROL: MdZgS#`  
     MaskBits|=CTRLBIT; dM{~Ubb  
     break; mwH!:f  
    case VK_SHIFT: x9l0UD*+g  
     MaskBits|=SHIFTBIT; mo[<4U ks  
     break; j#t8Krd] "  
    default: //judge the key and send message +wozjjc  
     break; x }'4^Cv  
   } JZ/O0PW  
   for(int index=0;index<MAX_KEY;index++){  ii y3  
    if(hCallWnd[index]==NULL) W'h0Zg  
     continue; S.|kg2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AYIz;BmWy  
    { Ir"Q%>K0f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m\M+pjz  
     bProcessed=TRUE; s}9tK(4v  
    } dqA[|bV  
   } ~h0BT(p/  
  } ++DQS9b{  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f~nt!$  
   for(int index=0;index<MAX_KEY;index++){ zK4 8vo  
    if(hCallWnd[index]==NULL) cuaNAJ  
     continue; ,Bw)n,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W#I:j: p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); S?\hbM]V-o  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Y{vwOs  
   } k_>Fw>Y  
  } <3=qLm  
 } o Xi}@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Du:p!nO  
} ,GkW. vEU  
An #Hb=  
  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: s%[GQQ-N  
UXPegK!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Wk#h,p3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E8_Le  
t-*|Hfp*^  
  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: s^YTI\L \  
q%k(M[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }BdVD t  
{ dIpW!Pj^  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) %m{.l4/!O  
 { 1"&;1Ts  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6$s0-{^  
  SaveBmp(); H9VXsFTW  
  return FALSE; |\|)j>[i  
 } ``|RO[+2  
 …… //其它处理及默认处理 dM s||&|&  
} ^qGA!_  
X";Z Up  
E<Dh_K  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 6QLQ1k`  
Fiu!!M6  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ;=+Zw1/g  
,ah*!Zm.kk  
  二、编程步骤 k l!?/M  
+6hl@Fm(  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; KU|BT .o8  
0vuKGjK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Kka8cG  
,{{#a*nd  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; h!G^dW.  
^@`e  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; .3&a{IxM]  
o4 %Vt} K  
  5、 添加代码,编译运行程序。 mw(c[.*%  
/pN'K5@  
三、程序代码 A ,-V$[;~D  
~z K@pFeH  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ihiuSF<NaQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) twtkH~`"Q  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ O5qW*r'  
#if _MSC_VER > 1000 %x}&=zx0*1  
#pragma once Y62u%':X  
#endif // _MSC_VER > 1000 wY3|#P CDV  
#ifndef __AFXWIN_H__ b-BM"~N'  
#error include 'stdafx.h' before including this file for PCH o)#q9Vk%b  
#endif Seq]NkgY  
#include "resource.h" // main symbols i#RElH  
class CHookApp : public CWinApp P}hY {y'  
{ Z.:<TrN  
 public: f `y" a@  
  CHookApp(); vS$oT]-hKE  
  // Overrides &{zwM |Q@?  
  // ClassWizard generated virtual function overrides gX$0[ sIS.  
  //{{AFX_VIRTUAL(CHookApp) 4e+BqCriC*  
 public: *5y W  
  virtual BOOL InitInstance(); n{64g+  
  virtual int ExitInstance(); G(As%r]  
  //}}AFX_VIRTUAL GG_^K#*  
  //{{AFX_MSG(CHookApp)  ,v*p  
  // NOTE - the ClassWizard will add and remove member functions here. *M wfod  
  // DO NOT EDIT what you see in these blocks of generated code ! #d Z/UM(u  
  //}}AFX_MSG M'umoZmW0  
  DECLARE_MESSAGE_MAP() QJ#u[hsMFp  
}; &nqdl+|G*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w|}W(=#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NtY*sUKRD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9fP) Fwih  
BOOL InitHotkey(); =R&)hlm  
BOOL UnInit(); }dX/Y /  
#endif (_w %  
4ZI!,lv*  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tw'hh@7-Y  
#include "stdafx.h" \E$1lc  
#include "hook.h" ,u}<Ws8N  
#include <windowsx.h> /M^V 2=  
#ifdef _DEBUG 'Aj(i/CM  
#define new DEBUG_NEW s(AJkO'`  
#undef THIS_FILE |66m` <  
static char THIS_FILE[] = __FILE__; ]{!!7Zz  
#endif K85_>C%g  
#define MAX_KEY 100 H(15vlOD  
#define CTRLBIT 0x04 cy)k<?,  
#define ALTBIT 0x02 I9}+(6  
#define SHIFTBIT 0x01 :tMre^oP  
#pragma data_seg("shareddata") 3P//H8 8LY  
HHOOK hHook =NULL; [d4,gEx`Q\  
UINT nHookCount =0; ORowx,(hX  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vWU%ST  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Opv1B2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ':l"mkd+`  
static int KeyCount =0; f?%qUD_#  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift `'p`PyMt`  
#pragma data_seg() rI0)F  
HINSTANCE hins; rIeM+h7Wn  
void VerifyWindow(); :E>&s9Yj?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) rH9uGm-*  
//{{AFX_MSG_MAP(CHookApp) h?0F-6z  
// NOTE - the ClassWizard will add and remove mapping macros here. V@vhj R4r\  
// DO NOT EDIT what you see in these blocks of generated code! eo1&.FQu  
//}}AFX_MSG_MAP XzT78  
END_MESSAGE_MAP() b fp,zs  
\ Y*h  
CHookApp::CHookApp() },DyU  
{ bh6d./  
 // TODO: add construction code here, >0PUWr$8  
 // Place all significant initialization in InitInstance 8f?rEI\0GD  
} m@ i2#  
hPa n  
CHookApp theApp; 0VzXDb>`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) nQ5N=l  
{ 7p)N_cJD  
 BOOL bProcessed=FALSE; aZ`<PdA  
 if(HC_ACTION==nCode) 9nn>O?  
 { bvl~[p$W3  
  if((lParam&0xc0000000)==0xc0000000){// Key up $^}[g9]1  
   switch(wParam) jip\4{'N  
   { q*L ]  
    case VK_MENU: FZiZg;  
     MaskBits&=~ALTBIT; n`%2Mj c  
     break; jCzGus!rM  
    case VK_CONTROL: ZA0i)(j*Mn  
     MaskBits&=~CTRLBIT; 5U%MoH  
     break; E;6~R M:  
    case VK_SHIFT: uie~'K\y  
     MaskBits&=~SHIFTBIT; [UMLx  
     break; dCE\^q[{  
    default: //judge the key and send message bA}Z0a  
     break; dM Y 0K  
   } %c]nWR+/  
   for(int index=0;index<MAX_KEY;index++){ ;a |`s  
    if(hCallWnd[index]==NULL) t)9]<pN%  
     continue; [s~JceUyX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )ZGYhE  
    { wW-Ab  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *=Doe2(!C  
     bProcessed=TRUE;  "Y7+{  
    } - %|P  
   } *zq.C  
  } h40'@u^W  
  else if((lParam&0xc000ffff)==1){ //Key down a mqOxb  
   switch(wParam) {>@QJlE0  
   { || [89G  
    case VK_MENU: }'%^jt[3  
     MaskBits|=ALTBIT; 6/| 0+G^  
     break; pprejUR  
    case VK_CONTROL: czI{qi5N  
     MaskBits|=CTRLBIT; wf?u (3/%  
     break; +0J@y1  
    case VK_SHIFT: t05_Px!mW  
     MaskBits|=SHIFTBIT; RdgVB G#Z1  
     break; X8Xn\E  
    default: //judge the key and send message  1Ao6y.S  
     break; jyi FM5&  
   } )GVBE%!WEd  
   for(int index=0;index<MAX_KEY;index++) u FZ~  
   { ~Rs#|JWB2V  
    if(hCallWnd[index]==NULL) IZ*}idlkn/  
     continue; Z`Ax pTl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ' WQdr(  
    { JWWYVl VC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \PbvN\L  
     bProcessed=TRUE; 3?2<W EYr  
    } 9JPEj-3`g  
   } ocF>LR%P  
  } _.{zpF=j  
  if(!bProcessed){ !EOQhh  
   for(int index=0;index<MAX_KEY;index++){ mQ}Gh_'ps  
    if(hCallWnd[index]==NULL) kn}z gSO  
     continue; o@9+mM"B)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) w?*z^y@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w$j{Hp6m  
   } ~^&R#4J  
  } II;Te7~  
 } TnNWO+ kg  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); HY;9?KJ'  
} o)&"Rf  
gfde#T)S  
BOOL InitHotkey() ?`"n3!>bS  
{ 8Atq,GcG  
 if(hHook!=NULL){ H<`\bej,  
  nHookCount++; &vkjmiAS  
  return TRUE; ;L~p|sF  
 } i@5 )` <?  
 else 537?9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); r<c #nD~K  
  if(hHook!=NULL) y<uAp  
   nHookCount++; X&a:g  
  return (hHook!=NULL); M+poB+K.  
} <~{du ?4n  
BOOL UnInit() D`pQ7  
{ 5qbq,#Pf  
 if(nHookCount>1){ jvHFFSK  
  nHookCount--; NQX>Qh 2  
  return TRUE; o0ZBi|U\4  
 } S8" f]5s  
 BOOL unhooked = UnhookWindowsHookEx(hHook); i%;"[M  
 if(unhooked==TRUE){ Z/<#n\>t0>  
  nHookCount=0; #f{lC0~vA  
  hHook=NULL; :+ Jt^ 6  
 } 0(y:$  
 return unhooked; #y 1Bx,  
} #DFp[\)1  
V}" g~=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;+U<bqL6  
{ 0{+.H_f`  
 BOOL bAdded=FALSE; >2b`\Q*<  
 for(int index=0;index<MAX_KEY;index++){ _c2WqQ-05  
  if(hCallWnd[index]==0){ `G!M>h@  
   hCallWnd[index]=hWnd; gCuAF$o  
   HotKey[index]=cKey; ?Go!j?#a  
   HotKeyMask[index]=cMask; aD9q^EoEs  
   bAdded=TRUE; Wd8R u/  
   KeyCount++; Gb2L }  
   break; >&U @f  
  } ST Z]8cw  
 } m#e*c [*G  
 return bAdded; 9b"MQ[B4#a  
} UDEj[12S  
tfYB_N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _=EKXE)&}  
{ C ^w)|2o}  
 BOOL bRemoved=FALSE; 5o)Y$>T0  
 for(int index=0;index<MAX_KEY;index++){ 8Pmdk1 ~  
  if(hCallWnd[index]==hWnd){ 0;<)\Wt=i9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4)kG-[#  
    hCallWnd[index]=NULL; .Z\Q4x#!Z  
    HotKey[index]=0; YoKs:e2/:  
    HotKeyMask[index]=0; $q_R?Eay  
    bRemoved=TRUE; %m&@o~+  
    KeyCount--; &~~wX,6+  
    break; &nj&:?w  
   } "m$3)7 $  
  } Lrd[O v  
 } /<Ld'J  
 return bRemoved; i47j lyH  
} =0 qpVFvU  
{"S6\%=  
void VerifyWindow() H8{ol6wc)6  
{ ]:ZdV9`  
 for(int i=0;i<MAX_KEY;i++){ upy\gkpnGO  
  if(hCallWnd!=NULL){ //f  
   if(!IsWindow(hCallWnd)){ 4J0Rv od_  
    hCallWnd=NULL; LWnR?Qve<  
    HotKey=0; VT%:zf  
    HotKeyMask=0; k; ZxY"^  
    KeyCount--; 4x;_AN  
   } @7oL#-  
  } x,n,Qlb  
 }  _; Y`  
} Iu[|<Cx  
lpB3&H8&  
BOOL CHookApp::InitInstance() %NHkDa!  
{ 2]cRXJ7h  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); NSQp< m  
 hins=AfxGetInstanceHandle(); 0Ua%DyJ  
 InitHotkey(); >&:NFq-  
 return CWinApp::InitInstance(); )%d*3\Tsd  
} PG~$D];  
CW&.NT  
int CHookApp::ExitInstance() 2`G OJ,$  
{ 9(4&KZpK  
 VerifyWindow(); )2IH 5  
 UnInit(); [ic870_  
 return CWinApp::ExitInstance(); O@V%Cu  
} r!PpUwod  
^T::-pN*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file iBTYY{-wF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) P!G858V(  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0Hxmm@X2  
#if _MSC_VER > 1000 jho**TQ P  
#pragma once Om;&_!i  
#endif // _MSC_VER > 1000 !%)F J:p  
$D'- k]E[H  
class CCaptureDlg : public CDialog (QoI<j""  
{ ;!!n{l$r'  
 // Construction &-d&t` `  
 public: u&mS8i}  
  BOOL bTray; @a:>$t  
  BOOL bRegistered; wMqX)}>  
  BOOL RegisterHotkey(); xG&)1sT#-\  
  UCHAR cKey; Gs+3e8  
  UCHAR cMask; Eow_&#WW;P  
  void DeleteIcon(); l vMlL5t  
  void AddIcon(); hCjR&ZA  
  UINT nCount; L>y J  
  void SaveBmp(); W\&8au ds  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor x^4xq#Bb7  
  // Dialog Data Qx;\USv  
  //{{AFX_DATA(CCaptureDlg) U4aU}1RKz  
  enum { IDD = IDD_CAPTURE_DIALOG }; SN7"7joP<  
  CComboBox m_Key; SCvVt  
  BOOL m_bControl; z|EEVNFd&  
  BOOL m_bAlt; $6OkIP.  
  BOOL m_bShift; 26&'X+n&  
  CString m_Path; if|+EN%  
  CString m_Number; <Ln1pV~k  
  //}}AFX_DATA 6KpHnSW  
  // ClassWizard generated virtual function overrides h3LE>}6D  
  //{{AFX_VIRTUAL(CCaptureDlg) /x_o!<M  
 public: S4=~`$eP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )OiT{-m  
 protected: b2b^1{@h;v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e/0<[s*#Q  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); x=ul&|^7D  
  //}}AFX_VIRTUAL qlL`jWJ  
  // Implementation s l]_M  
 protected: R" ;x vo*  
  HICON m_hIcon; na9sm  
  // Generated message map functions ]gYz 4OT  
  //{{AFX_MSG(CCaptureDlg) ~0beuK&p  
  virtual BOOL OnInitDialog(); kY*rb_2j  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); B2-V@06  
  afx_msg void OnPaint(); Ecd;<$tk  
  afx_msg HCURSOR OnQueryDragIcon(); GrUCZ<S  
  virtual void OnCancel(); `c<;DhNO  
  afx_msg void OnAbout(); _%5R o6  
  afx_msg void OnBrowse(); ]]Cb$$Td  
  afx_msg void OnChange();  GB$;n?  
 //}}AFX_MSG GGnpjwXeH  
 DECLARE_MESSAGE_MAP() \"X!2  
}; bGc~Wr|  
#endif Vx~,Uex0+  
b0lq\9  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file $2W%2rZ  
#include "stdafx.h" (p2K36,9m  
#include "Capture.h" UK<Nj<-'t  
#include "CaptureDlg.h" anXc|  
#include <windowsx.h> 0g0i4IV  
#pragma comment(lib,"hook.lib") ;W>k@L  
#ifdef _DEBUG l c+g&f  
#define new DEBUG_NEW 9 FB19  
#undef THIS_FILE -r-k_6QP  
static char THIS_FILE[] = __FILE__; ^J$2?!~  
#endif R8ZK]5{o  
#define IDM_SHELL WM_USER+1 spt6]"Ni  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); KXx32 b,~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); e" St_z(  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; j'A_'g'^  
class CAboutDlg : public CDialog Y;?{|  
{ Z'"tB/=W  
 public: _f$^%?^  
  CAboutDlg(); _d5QbTe  
  // Dialog Data "wNJ  
  //{{AFX_DATA(CAboutDlg) 9I}-[|`u  
  enum { IDD = IDD_ABOUTBOX }; ,6-:VIHQ  
  //}}AFX_DATA Wk)OkIFR  
  // ClassWizard generated virtual function overrides u6AA4(  
  //{{AFX_VIRTUAL(CAboutDlg) 5`~PR :dN  
 protected: x[a<mk  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vN`klDJgW[  
  //}}AFX_VIRTUAL ibj87K  
  // Implementation vX/T3WV  
 protected: A"L&a l$i  
  //{{AFX_MSG(CAboutDlg) gt@m?w(  
  //}}AFX_MSG -*1J f&  
  DECLARE_MESSAGE_MAP() '<"s \,  
}; @7IIM{  
` @`CG[-9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 3kybLOG  
{ )h7<?@wv&  
 //{{AFX_DATA_INIT(CAboutDlg) e)d`pQ6  
 //}}AFX_DATA_INIT <g$~1fa  
} U|jSa,}  
4 o Fel.o  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) h&KO<>  
{ j0oR) du  
 CDialog::DoDataExchange(pDX); _h{C_;a[_  
 //{{AFX_DATA_MAP(CAboutDlg) sB7# ~p A  
 //}}AFX_DATA_MAP Zy`m!]G]80  
} h2G$@8t}I  
Q+[n91ey**  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) :tV*7S=)  
 //{{AFX_MSG_MAP(CAboutDlg) x(1:s|Uyp{  
 // No message handlers Fld=5B^}  
 //}}AFX_MSG_MAP AE[b},-[  
END_MESSAGE_MAP() JRB9rSN^  
LRL,m_gt  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) fp`;U_-&0  
: CDialog(CCaptureDlg::IDD, pParent) ;ub;l h3  
{ +S o4rA*9  
 //{{AFX_DATA_INIT(CCaptureDlg) Ayxkv)%:@)  
  m_bControl = FALSE; uXn1 'K<'2  
  m_bAlt = FALSE; uvkz'R=  
  m_bShift = FALSE; c2l@6<Ww  
  m_Path = _T("c:\\"); 0XE4<U   
  m_Number = _T("0 picture captured."); vS;RJg=  
  nCount=0; %)1y AdG 8  
  bRegistered=FALSE; CsGx@\jN  
  bTray=FALSE; v[1aW v:  
 //}}AFX_DATA_INIT Kp%2k^U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 xi~?>f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ekWD5,G  
} O%Xf!4Z  
d; boIP`M;  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~vm%6CABM  
{ Z^3rLCa  
 CDialog::DoDataExchange(pDX); Fs9!S a7v  
 //{{AFX_DATA_MAP(CCaptureDlg) ?9 <:QE;I>  
  DDX_Control(pDX, IDC_KEY, m_Key); ; ZA~p  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); d,k!qjf=r  
  DDX_Check(pDX, IDC_ALT, m_bAlt); T(id^ w  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E(>=rD/+  
  DDX_Text(pDX, IDC_PATH, m_Path); P3x8UR=fS  
  DDX_Text(pDX, IDC_NUMBER, m_Number); gb[5&> (#  
 //}}AFX_DATA_MAP NcBIg:V\c  
} f%][}NN)Xr  
6]K_m(F  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %O|iE M  
//{{AFX_MSG_MAP(CCaptureDlg) Ag-(5:  
 ON_WM_SYSCOMMAND() , qMzWa  
 ON_WM_PAINT() fK>L!=Q  
 ON_WM_QUERYDRAGICON() 9+Np4i@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Cio 1E-4  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R@1xt@?  
 ON_BN_CLICKED(ID_CHANGE, OnChange) luh$2 \5B  
//}}AFX_MSG_MAP }T(D7|^R  
END_MESSAGE_MAP() UXJ eAE-  
&* M!lxDN  
BOOL CCaptureDlg::OnInitDialog() =W(Q34  
{ n\mO6aJ  
 CDialog::OnInitDialog(); I9|mG'  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); W!Gq.M  
 ASSERT(IDM_ABOUTBOX < 0xF000); 8'HEms  
 CMenu* pSysMenu = GetSystemMenu(FALSE); o_izl \  
 if (pSysMenu != NULL) 03$mYS_?  
 { R`NYEptJ  
  CString strAboutMenu; t% d Z-Ym  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 0yk]o5a++  
  if (!strAboutMenu.IsEmpty()) rD*jp6Cl  
  { cN/6SGHK  
   pSysMenu->AppendMenu(MF_SEPARATOR); W=~~5jFX  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;AG8C#_  
  } .]8ZwAs=&  
 } d[iQ` YW5  
 SetIcon(m_hIcon, TRUE); // Set big icon g|o,uD  
 SetIcon(m_hIcon, FALSE); // Set small icon qU \w=  
 m_Key.SetCurSel(0); Q *D;U[  
 RegisterHotkey(); qqjwJ!@P  
 CMenu* pMenu=GetSystemMenu(FALSE); `+]Qz =}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (p"%O  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 4>wP7`/+y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); R$R *'l  
 return TRUE; // return TRUE unless you set the focus to a control !z\h| wU+  
} \1k79c  
=/@D8{pU  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 0{5w 6  
{ S,88*F(<^q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) tH!]Z4}u  
 { R)c?`:iUB  
  CAboutDlg dlgAbout; /2&c$9=1  
  dlgAbout.DoModal(); LQ@"Xe]5  
 } u+9hL4  
 else k R?qb6  
 { 1I%w?^sm_  
  CDialog::OnSysCommand(nID, lParam); /ixp&Z|7  
 } A7%)~z<  
} NDN7[7E  
nGC/R&  
void CCaptureDlg::OnPaint() &h}#HS>l  
{ \;,_S+Fz8  
 if (IsIconic()) _P!m%34|  
 { ./\@Km?  
  CPaintDC dc(this); // device context for painting y'3rNa]G1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /4yo`  
  // Center icon in client rectangle sU=H&D99  
  int cxIcon = GetSystemMetrics(SM_CXICON); D(~U6SR  
  int cyIcon = GetSystemMetrics(SM_CYICON); D, k6$`  
  CRect rect; bTI|F]^!  
  GetClientRect(&rect); ?e%ZOI  
  int x = (rect.Width() - cxIcon + 1) / 2; lt/1f{v[:  
  int y = (rect.Height() - cyIcon + 1) / 2; 1y:-N6  
  // Draw the icon W8G,=d}6  
  dc.DrawIcon(x, y, m_hIcon); FUiRTRIYe  
 } % aP!hy  
 else l5~os>  
 { d9k0F OR1  
  CDialog::OnPaint(); zrvF]|1UP  
 } )~X2 &^orW  
} "fb[23g%@k  
Q-(zwAaE  
HCURSOR CCaptureDlg::OnQueryDragIcon() ~]sc^[  
{ irZ])a  
 return (HCURSOR) m_hIcon; 49eD1h3'X[  
} |44Ploz2b  
M$ wC=b  
void CCaptureDlg::OnCancel() 91/Q9xY  
{ Q1Kfi8h}'  
 if(bTray) %7hrk  
  DeleteIcon(); Kf3"Wf^q   
  CDialog::OnCancel(); n3WlZ!$  
} aHD]k8 m z  
r-,%2y?  
void CCaptureDlg::OnAbout() !M(xG%M-V  
{ 6W/`07 '  
 CAboutDlg dlg; )705V|v  
 dlg.DoModal(); 1Yq!~8  
} X;$+,&M"  
\$K20)  
void CCaptureDlg::OnBrowse() 5%"V[lDx@  
{ F~-(:7j  
 CString str; j;zM{qu_  
 BROWSEINFO bi; /l3V3B7  
 char name[MAX_PATH]; 7^avpf)>  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +L$Xv  
 bi.hwndOwner=GetSafeHwnd(); hDDn,uzpd  
 bi.pszDisplayName=name; dRYqr}!%n  
 bi.lpszTitle="Select folder"; Zpt\p7WQ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *VCXihgo  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $t+,Tav  
 if(idl==NULL) y RqL9t  
  return; 10Q ]67  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !aUs>1i  
 str.ReleaseBuffer(); l]5K N  
 m_Path=str; q])K,)  
 if(str.GetAt(str.GetLength()-1)!='\\') }{Pp]*I<A  
  m_Path+="\\"; -OV&Md:~  
 UpdateData(FALSE); gb1V~  
} L;z?a Z7n  
2DA]i5  
void CCaptureDlg::SaveBmp() 3Tcms/n  
{ AI2)g1m  
 CDC dc; \  #F  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Z-%\ <zT  
 CBitmap bm; b`Zx!^  
 int Width=GetSystemMetrics(SM_CXSCREEN); lf|FWqqV  
 int Height=GetSystemMetrics(SM_CYSCREEN); s S+MqBh&I  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 'ms-*c&  
 CDC tdc; }rUN_.n4z  
 tdc.CreateCompatibleDC(&dc); |"}FXa O  
 CBitmap*pOld=tdc.SelectObject(&bm); "S[450%  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (MM]N=Tw4  
 tdc.SelectObject(pOld); yZY\MB/  
 BITMAP btm; i}f"yO+Q+  
 bm.GetBitmap(&btm); iQ67l\{R  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )MVz$h{c.]  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Pm6p v;WK  
 BITMAPINFOHEADER bih; K-)] 1BG  
 bih.biBitCount=btm.bmBitsPixel; (XTG8W sN  
 bih.biClrImportant=0; ;fTKfa  
 bih.biClrUsed=0; HQdxL*N%^  
 bih.biCompression=0; FjHv   
 bih.biHeight=btm.bmHeight; z _$%-6  
 bih.biPlanes=1; Y(y kng  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3DX*gsx(  
 bih.biSizeImage=size; ^CYl\.Y@  
 bih.biWidth=btm.bmWidth; Qp5VP@t  
 bih.biXPelsPerMeter=0; ;+R&}[9,A)  
 bih.biYPelsPerMeter=0; ma]F7dZ5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ZDJ`qJ8V  
 static int filecount=0; ?>:g?.+  
 CString name; QE+g j8  
 name.Format("pict%04d.bmp",filecount++); 1ba~SHi  
 name=m_Path+name; 5DU6rks%  
 BITMAPFILEHEADER bfh; =j_4S<  
 bfh.bfReserved1=bfh.bfReserved2=0; 9.M4o[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); n+9=1Oo"  
 bfh.bfSize=54+size; *8A  
 bfh.bfOffBits=54; C[AqFo  
 CFile bf; /U*C\ xMm  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ J1U/.`Oy  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); !?jrf] A@  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); oH?b}T=9jz  
  bf.WriteHuge(lpData,size); p<FzJ   
  bf.Close(); HyQJXw?A:  
  nCount++; O/(`S<iip  
 } }"H,h)T  
 GlobalFreePtr(lpData); x8B}ZIbT9  
 if(nCount==1)  Mx?d  
  m_Number.Format("%d picture captured.",nCount); net@j#}j-  
 else &m7]v,&  
  m_Number.Format("%d pictures captured.",nCount); Xu'&ynID  
  UpdateData(FALSE); 8 FK/~,I  
} P`+{@@  
H2 {+)  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) u~:y\/Y6  
{ Lg+Ac5y}`  
 if(pMsg -> message == WM_KEYDOWN) +)om^e@.  
 {  qA7>vi%  
  if(pMsg -> wParam == VK_ESCAPE) k"%~"9  
   return TRUE; K7B/s9/xs  
  if(pMsg -> wParam == VK_RETURN) |Zpfq63W  
   return TRUE; *;slV3  
 } +o{R _  
 return CDialog::PreTranslateMessage(pMsg); M/'sl;  
} U}[d_f  
bH9kj/q\b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) |s(FLF-  
{ xt* 3'v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P1 8hxXE3  
  SaveBmp(); {]!mrAjD  
  return FALSE; f}ji?p  
} \)904W5R  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ M)+H{5bt  
 CMenu pop; /Iy]DU8  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A`$%SVgFV^  
 CMenu*pMenu=pop.GetSubMenu(0); ^mDe08. %b  
 pMenu->SetDefaultItem(ID_EXITICON); VcYrK4  
 CPoint pt; ek\ xx  
 GetCursorPos(&pt); rU:`*b<  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /t57!&  
 if(id==ID_EXITICON) R?|.pq/Ln  
  DeleteIcon(); /SR*W5#s  
 else if(id==ID_EXIT) _Ey9G  
  OnCancel(); VA>35w  
 return FALSE; %N6A+5H  
} ~ 'cmSiz-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); xh,qNnGGi  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^zmG0EH,  
 AddIcon(); <c-=3}=U\  
 return res; %@aSe2B  
} "Yv_B3p   
.V/Rfq  
void CCaptureDlg::AddIcon() ::lKL  
{ wu!59pL  
 NOTIFYICONDATA data; r'r%w#=`t  
 data.cbSize=sizeof(NOTIFYICONDATA); :{v#'U/^  
 CString tip; 4jM Fr,  
 tip.LoadString(IDS_ICONTIP); 6:5I26  
 data.hIcon=GetIcon(0); UgN u`$m+  
 data.hWnd=GetSafeHwnd(); {X+3;&@  
 strcpy(data.szTip,tip); O, wJR  
 data.uCallbackMessage=IDM_SHELL; K(rWNO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; [wOn|)& &  
 data.uID=98; n1t*sk/J  
 Shell_NotifyIcon(NIM_ADD,&data); Tbih+# ?  
 ShowWindow(SW_HIDE); CS5?Ti6  
 bTray=TRUE; 'RR~7h  
} '~<m~UXvD#  
#aJ(m&  
void CCaptureDlg::DeleteIcon() 81F/G5  
{ ;(/ZO%h  
 NOTIFYICONDATA data; yCR?UH;  
 data.cbSize=sizeof(NOTIFYICONDATA); WIT>!|w_  
 data.hWnd=GetSafeHwnd(); @Zu5VpJ  
 data.uID=98; ,j{,h_Op  
 Shell_NotifyIcon(NIM_DELETE,&data); |Nn)m  
 ShowWindow(SW_SHOW); RDi]2  
 SetForegroundWindow(); BWa,f8  
 ShowWindow(SW_SHOWNORMAL); ?0?#U0(;u  
 bTray=FALSE; QB uMJm  
} Ad8n<zt|  
wLH>:yKUU  
void CCaptureDlg::OnChange() ~O0 $Suv  
{ y/{fX(aV  
 RegisterHotkey(); wC+u73599  
} *[Tz![|  
- >-KCd1b  
BOOL CCaptureDlg::RegisterHotkey() n8 i] z  
{ ,, OW  
 UpdateData(); KIf dafRL  
 UCHAR mask=0; gMmaK0uhS  
 UCHAR key=0; kk@fL  
 if(m_bControl) xb~yM%*c  
  mask|=4; vn!3l1\+J  
 if(m_bAlt) 5h-SCB>P  
  mask|=2; Tod&&T'UW  
 if(m_bShift) O)*+="Rg  
  mask|=1; O!#g<`r{K  
  key=Key_Table[m_Key.GetCurSel()]; uAJx.>$b  
 if(bRegistered){ NZLxHD]mp  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask);  I<mV+ex  
  bRegistered=FALSE;  :D6 ON"6  
 } m)t;9J5  
 cMask=mask; 2j88<Yh]H  
 cKey=key; rk2j#>l$4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 2g-j.TM  
 return bRegistered; z6=Z\P+  
} Ts[_u@   
_[c0)2h  
  四、小结 =JEv,ZGT3  
6:[dj*KGmT  
  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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