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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: ;[_w&"[6a  
  qwb`8o  
  一、实现方法 }UzO_&Z#6  
1qs~[7{C1  
  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: >%"Q]p  
's]+.3">L1  
#pragma data_seg("shareddata") us.+nnd  
HHOOK hHook =NULL; //钩子句柄 b=#3p  
UINT nHookCount =0; //挂接的程序数目 z"eh.&T  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 aE_)iE|  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 y %k`  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey =](c7HEQf  
static int KeyCount =0; bW`@9 =E  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `;^%t  
#pragma data_seg() mX8A XWIa  
|\/0S  
  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。 aBM'ROQ  
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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: Lp \%-s#5s  
y\ nR0m  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR u+]v. Mt  
cKey,UCHAR cMask) `9Qr kkG+  
{ /HNZwbh]uJ  
 BOOL bAdded=FALSE; tVhY=X{N?  
 for(int index=0;index<MAX_KEY;index++){ Bc4{$sc"O  
  if(hCallWnd[index]==0){ Q<L.!%vu}  
   hCallWnd[index]=hWnd; Sa&~\!0t  
   HotKey[index]=cKey; B[ f{Ys  
   HotKeyMask[index]=cMask; c;w~-7Q*|  
   bAdded=TRUE; mu1oD;lQ  
   KeyCount++; 6,'!z ?d%  
   break; jl<rxO?-F  
  } A a2*f[  
 } `d=$9Pi  
 return bAdded; xDBEs*  
} P,"z  
//删除热键 ufdC'2cp8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?ng?>!  
{ +q]  
 BOOL bRemoved=FALSE; :):=KowI  
 for(int index=0;index<MAX_KEY;index++){ /Q"nQSG  
  if(hCallWnd[index]==hWnd){ 0EM`,?i .Q  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^zGgvFf>  
    hCallWnd[index]=NULL; Tk-PCra  
    HotKey[index]=0; OwP9=9};  
    HotKeyMask[index]=0; :^SpKe(7  
    bRemoved=TRUE; G'( %8\  
    KeyCount--; -A9 !Y{Z  
    break; 'uUp1+  
   } $JTy`g0>x  
  } p5C sw5  
 } 1fL@rR  
 return bRemoved; 9`^VuC'  
} L{~L6:6An  
=~Jv*c  
u+s#Fee I  
  DLL中的钩子函数如下: -e%=Mpq.  
)BTJs)E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @Q x|!%  
{ (FMYR8H*(  
 BOOL bProcessed=FALSE; N_L&!%s  
 if(HC_ACTION==nCode) tGzYO/Zp  
 { mW 5L;>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }se)=7d8 Z  
   switch(wParam) w\_NrsO!x  
   {  Fm-W@  
    case VK_MENU: 2 < &-  
     MaskBits&=~ALTBIT; W.\HfJ74  
     break; $BE^'5G&4Y  
    case VK_CONTROL: g_] u<8&  
     MaskBits&=~CTRLBIT; 6!bA~"N  
     break; -p ) l63  
    case VK_SHIFT: |.:O$/ Tt[  
     MaskBits&=~SHIFTBIT; C3 0b}2  
     break; PZpwi?N  
    default: //judge the key and send message c6s(f  
     break; S:vv*5  
   } HtEjM|zj  
   for(int index=0;index<MAX_KEY;index++){ `+B+RQl}[  
    if(hCallWnd[index]==NULL) {<~XwJ.  
     continue; /^uvY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |gxU;"2`5~  
    { 2>fG}qYy$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \\hZlCV,  
     bProcessed=TRUE; p>K'6lCa  
    } [p!C+ |rro  
   } N,'JQch},8  
  } 1y0.tdI(  
  else if((lParam&0xc000ffff)==1){ //有键按下 FPMhHHM  
   switch(wParam) Z6>:k,-Ot  
   { =oT@h 9VI  
    case VK_MENU: ~uC4>+dk  
     MaskBits|=ALTBIT; yc]ni.Hz  
     break; 6{azzk8  
    case VK_CONTROL: UUb!2sO  
     MaskBits|=CTRLBIT; ; tvB{s_  
     break; EemKYcE@Nr  
    case VK_SHIFT: gSR&CnqZ<  
     MaskBits|=SHIFTBIT; 1V+1i)+  
     break; bHS2;K~  
    default: //judge the key and send message @dCu]0oNI  
     break; \U !<-  
   } q3NS?t!  
   for(int index=0;index<MAX_KEY;index++){ mu"]B]  
    if(hCallWnd[index]==NULL) 0A?w,A`"  
     continue; B"KsYB79t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (m04Z2#  
    { xA!o"VZPq7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7=QV^G  
     bProcessed=TRUE; 82J0t}:U  
    } niy@'  
   } 0^ E!P>  
  } p6Z]oL q  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  _&(ij(H  
   for(int index=0;index<MAX_KEY;index++){ Go`omh b  
    if(hCallWnd[index]==NULL) ziH2<@  
     continue; sgX}`JH?z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CdaB.xk  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $d8A_CUU  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 z%Z}vWn  
   } d}l^yln  
  } >P0AGZ  
 } }(o/+H4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p*npY"}v  
} y'@l,MN{  
3gabk/  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: X2@o"xU  
Q.y KbO<[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r`B+ KQ4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U1q$B32  
p\-.DRwT`  
  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: f "&q~V4?  
~!&[;EM<bm  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \~?s= LT  
{ KFfwZkj{  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *e>:K$r  
 { %BG5[ XQ7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \clWrK  
  SaveBmp(); +z[!]^H]4  
  return FALSE; GzB%vsv9 5  
 } 6op\g].P  
 …… //其它处理及默认处理 $`=?Nb@@#  
} &9ZIf#R  
X4k/7EA  
F`- [h )e.  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 h{JVq72R  
D$mrnm4d  
  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。 <.v6w*+{/  
C,<TAm  
  二、编程步骤 /N^+a-.Qd  
qt:->yiq+  
  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"; EV(/@kN2  
&qpA<F@7  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~%}g"|o  
#-f^;=7  
  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; nWl0R=  
l|fd,  
  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; j?mJ1J5  
Ucy9fM  
  5、 添加代码,编译运行程序。 Z*QRdB%,  
"Jwz.,Y\  
三、程序代码 /vV 0$vg  
qB:`tHy  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |kd^]! _  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) <5#e.w  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ $_ i41f[  
#if _MSC_VER > 1000 a,E;R$[!  
#pragma once zSH#j RDV  
#endif // _MSC_VER > 1000 [< `+9R  
#ifndef __AFXWIN_H__ l )4OV>  
#error include 'stdafx.h' before including this file for PCH a;zcAeX  
#endif V& nN/CF  
#include "resource.h" // main symbols Cn<kl^!Q-  
class CHookApp : public CWinApp k^]~NP  
{ jl@8pO$  
 public: z?aD Oh  
  CHookApp(); }*t~&l0  
  // Overrides zKutx6=aj  
  // ClassWizard generated virtual function overrides ={Hbx> p  
  //{{AFX_VIRTUAL(CHookApp) 4<Y?#bm'  
 public: 1_QO>T'  
  virtual BOOL InitInstance(); **"P A8   
  virtual int ExitInstance(); ?l(hS\N,  
  //}}AFX_VIRTUAL B::?  
  //{{AFX_MSG(CHookApp) +W1rm$Q  
  // NOTE - the ClassWizard will add and remove member functions here. &Xav$6+Z1J  
  // DO NOT EDIT what you see in these blocks of generated code ! TGLXvP& \  
  //}}AFX_MSG H:_`]X"  
  DECLARE_MESSAGE_MAP() 5 9vGLN!L  
}; UGMdWq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); *Tlv'E.M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vKt_z@{{L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %Fv)$ :b  
BOOL InitHotkey(); E*l"uV  
BOOL UnInit(); 6p@ts`#  
#endif 88K*d8m  
<b\urtoJ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9<ayQ*  
#include "stdafx.h" zyr6Tv61U  
#include "hook.h" $3ILVT  
#include <windowsx.h> ;gyE5n-{  
#ifdef _DEBUG fjFy$NX&>  
#define new DEBUG_NEW xpk|?/6  
#undef THIS_FILE "mf;k^sqS  
static char THIS_FILE[] = __FILE__; ||4Dtg K  
#endif X@)lPr$a  
#define MAX_KEY 100 E(8g(?4  
#define CTRLBIT 0x04 y)}aySQK^  
#define ALTBIT 0x02 +9X[gef8  
#define SHIFTBIT 0x01 1dcy+ !>  
#pragma data_seg("shareddata") 'w2;oO  
HHOOK hHook =NULL; [;I8ZVE  
UINT nHookCount =0; -ZB"Yg$l  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4=Ey\Px  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT >`:+d'Jv0  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ||V:',#,W  
static int KeyCount =0; 7yp*I[1Qf>  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^XM;D/Gp~  
#pragma data_seg() TRZ^$<AG  
HINSTANCE hins; q*O KA5  
void VerifyWindow(); 5o/rV.I  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Pa}vmn1$  
//{{AFX_MSG_MAP(CHookApp) ?la_ +;m  
// NOTE - the ClassWizard will add and remove mapping macros here. Eg*3**gTO  
// DO NOT EDIT what you see in these blocks of generated code! w^gh&E  
//}}AFX_MSG_MAP .D .Rn/  
END_MESSAGE_MAP() (zBQ^97]  
6{'6_4;Fv(  
CHookApp::CHookApp() [/G;XHL;?  
{ x8Sq+BY  
 // TODO: add construction code here, *-_Np u6  
 // Place all significant initialization in InitInstance &}O!l'  
} .KN]a"]  
)^TQedF  
CHookApp theApp; {P&^Erx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Zi)b<tM q  
{ &pm{7nH  
 BOOL bProcessed=FALSE; kg@h R}  
 if(HC_ACTION==nCode) ~\ f^L?m  
 { w>u Z$/  
  if((lParam&0xc0000000)==0xc0000000){// Key up 0K ?(xB  
   switch(wParam) 7VcVI? ?  
   { Q\L5ZJ%y/  
    case VK_MENU: }=a4uCE  
     MaskBits&=~ALTBIT; gQWX<  
     break; ;Oy>-Ij5P  
    case VK_CONTROL: / JB4#i7  
     MaskBits&=~CTRLBIT; fh#_Mj+y  
     break; I0K!Kcu5Iu  
    case VK_SHIFT: K*$#D1hG  
     MaskBits&=~SHIFTBIT; Wg^cj:&`u  
     break; de9l;zF  
    default: //judge the key and send message Z@!W? Ed  
     break; tY=%@v'6?  
   } v\,%)Z/  
   for(int index=0;index<MAX_KEY;index++){ 2< Bv=B  
    if(hCallWnd[index]==NULL) r%d 11[z  
     continue; -G#k/Rz6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9Z'eBp  
    { CDnz &?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -P>=WZu  
     bProcessed=TRUE; Hs=N0Sk]j  
    } &pjV4m|j<  
   } *]R 0z|MW  
  } Y&+_p$13  
  else if((lParam&0xc000ffff)==1){ //Key down #Hi]&)p_  
   switch(wParam) RJwIN,&1.  
   { J"/z?!)IB  
    case VK_MENU: A(OfG&!  
     MaskBits|=ALTBIT; Z&jb,eh2  
     break; Xe;(y "pR  
    case VK_CONTROL: '%C.([  
     MaskBits|=CTRLBIT; ?7)(qnbe"  
     break; ^!o}>ls['  
    case VK_SHIFT: orH0M!OtS!  
     MaskBits|=SHIFTBIT; K#hYbDm  
     break; s}9tK(4v  
    default: //judge the key and send message v9m;vWp  
     break; jUvA<r  
   } ,,%:vK+V  
   for(int index=0;index<MAX_KEY;index++) V9u\;5oL  
   { f&|A[i>g  
    if(hCallWnd[index]==NULL) 917 0bmr  
     continue; -MU.Hu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6F.7Ws <  
    { <3=qLm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); RS `9?c:  
     bProcessed=TRUE; ]/Yy-T#@  
    } ;'QY<,p[e  
   } ywynx<Wg  
  } t-*|Hfp*^  
  if(!bProcessed){ 3*$9G)Ey  
   for(int index=0;index<MAX_KEY;index++){ rjHIQC C  
    if(hCallWnd[index]==NULL) a,*p_:~i  
     continue; %M#?cmt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Fra>|;do  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H9VXsFTW  
   } G yAgPz  
  } xVkTRCh  
 } ^qGA!_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |4S?>e  
} N&^xq_9&  
wK'!xH^  
BOOL InitHotkey() n<<=sj$\!  
{ T<+ht8&M8  
 if(hHook!=NULL){ \!JS7!+  
  nHookCount++; qJ+52U|z  
  return TRUE; -9>LvLU  
 } g(1B W#$  
 else yvd `nV  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ur<eew@8@i  
  if(hHook!=NULL) ^@`e  
   nHookCount++; %7v@n+Q  
  return (hHook!=NULL); 6L,lq;  
} 9Ue7 ~"=  
BOOL UnInit() l^ 0_> R  
{ }\f(qw  
 if(nHookCount>1){ ^{*f3m/  
  nHookCount--; 3g0u#t{  
  return TRUE; 2zKo  
 } g+}s:9  
 BOOL unhooked = UnhookWindowsHookEx(hHook); w=D%D8 r2  
 if(unhooked==TRUE){ nx-1*  
  nHookCount=0; uKbHFF  
  hHook=NULL; w}j6 .r  
 } %l:|2s:  
 return unhooked; &{zwM |Q@?  
} PW*;Sp  
NFY|^*bll  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w53z*l>ek  
{ sq~+1(X  
 BOOL bAdded=FALSE; 4@v1jJj  
 for(int index=0;index<MAX_KEY;index++){ Jh$"fr3  
  if(hCallWnd[index]==0){ j,=*WG  
   hCallWnd[index]=hWnd; Dd0Qp-:2  
   HotKey[index]=cKey; xvR?~  
   HotKeyMask[index]=cMask; &nqdl+|G*  
   bAdded=TRUE; mQJ4;BJw  
   KeyCount++; ik2- OM  
   break; QB/7/PW{H\  
  } /&]-I$G@  
 } V$dJmKg  
 return bAdded; 2cCWQ"_,  
} ADYx.8M|9i  
4= Tpi`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5pRY&6So  
{ >f\zCT%cf  
 BOOL bRemoved=FALSE; (Qk&g"I  
 for(int index=0;index<MAX_KEY;index++){ 731h ~x!u  
  if(hCallWnd[index]==hWnd){ b JfD\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bQwdgc),s{  
    hCallWnd[index]=NULL; -F"d0a,  
    HotKey[index]=0; 3P//H8 8LY  
    HotKeyMask[index]=0; dD/t_ {h  
    bRemoved=TRUE; uxa=KM1H  
    KeyCount--; )=jT_?9b   
    break; xLx"*jyL  
   } H\^VqNK"  
  } !8xKf*y  
 }  yS[z2:!  
 return bRemoved; rH9uGm-*  
} J`w]}GlH  
I*D<J$ 9N  
void VerifyWindow() XzT78  
{ k)`$%[K8  
 for(int i=0;i<MAX_KEY;i++){ ~J0,)_b%*  
  if(hCallWnd!=NULL){ n{dP@_>WS  
   if(!IsWindow(hCallWnd)){ M#OH Y *  
    hCallWnd=NULL; r\(v+cd  
    HotKey=0; hPa n  
    HotKeyMask=0; dh&W;zs  
    KeyCount--; TdQ ]G2  
   } Rl_.;?v"!  
  } tM&n3MWQ  
 } $ZQ"({<w<g  
}  ispkj'  
pT4qPta,2  
BOOL CHookApp::InitInstance() sN m,Fmuz:  
{ CN7 k?JO<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !w q4EV  
 hins=AfxGetInstanceHandle(); RCI4~q  
 InitHotkey(); |~SE"  
 return CWinApp::InitInstance(); R6`*4z S  
} np\st7&f6  
?*[\UC  
int CHookApp::ExitInstance() DU;[btK>  
{ %c]nWR+/  
 VerifyWindow(); %yp5DD}|  
 UnInit(); tp Xa*6  
 return CWinApp::ExitInstance(); )ZGYhE  
} D!oZ?dGCo6  
dFQ o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {AOG"T&<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %`#G92Z_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Yp*,Jp1  
#if _MSC_VER > 1000 "OO96F  
#pragma once P/ci/y_1  
#endif // _MSC_VER > 1000 \yNQQ$B  
~LbS~_\C=  
class CCaptureDlg : public CDialog T|ZF/&XP  
{ .(|+oHg<  
 // Construction +0J@y1  
 public: %tV32l=  
  BOOL bTray; / |GT\X4o  
  BOOL bRegistered; s`"OM^[-  
  BOOL RegisterHotkey(); wUoiXi09  
  UCHAR cKey; G$C }?"l  
  UCHAR cMask; u FZ~  
  void DeleteIcon(); d<x1*a  
  void AddIcon(); /HkFlfPd  
  UINT nCount; ' WQdr(  
  void SaveBmp(); :[xvlW29  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (? \?it-  
  // Dialog Data thuRNYv <  
  //{{AFX_DATA(CCaptureDlg) pz 7H To;p  
  enum { IDD = IDD_CAPTURE_DIALOG }; 1Dq<{;rWb  
  CComboBox m_Key; daslaa_A  
  BOOL m_bControl; ["a"x>X&  
  BOOL m_bAlt; g:_hj_1Y M  
  BOOL m_bShift; #--olEj!  
  CString m_Path; d ;^  
  CString m_Number; TnNWO+ kg  
  //}}AFX_DATA mG2VZ>  
  // ClassWizard generated virtual function overrides wK ?@.l)u  
  //{{AFX_VIRTUAL(CCaptureDlg) 7X}TB\N1  
 public: H<`\bej,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); fG&=Ogy  
 protected: t0Zk-/s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 537?9  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U\jb"  
  //}}AFX_VIRTUAL dv~pddOs  
  // Implementation M+poB+K.  
 protected: s\gp5MT  
  HICON m_hIcon; R4{-Qv#8 q  
  // Generated message map functions jvHFFSK  
  //{{AFX_MSG(CCaptureDlg) iA'As%S1  
  virtual BOOL OnInitDialog(); cJDd0(tD!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); XA<ozq'  
  afx_msg void OnPaint(); H(|AH;?ou  
  afx_msg HCURSOR OnQueryDragIcon(); F2;:vTA>  
  virtual void OnCancel(); \\:|Odd  
  afx_msg void OnAbout(); -\#lF?fzb  
  afx_msg void OnBrowse(); f+x ;:  
  afx_msg void OnChange(); 2q PhLCe Z  
 //}}AFX_MSG sN~\+_  
 DECLARE_MESSAGE_MAP() PcC/_+2  
}; kz B\'m,l  
#endif '\"G{jU@  
gCuAF$o  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 2&he($HIzg  
#include "stdafx.h" Bz /@c)  
#include "Capture.h" VUtXxvH  
#include "CaptureDlg.h" :,S98z#  
#include <windowsx.h> m#e*c [*G  
#pragma comment(lib,"hook.lib") $*f?&U]k  
#ifdef _DEBUG 6w| J -{2  
#define new DEBUG_NEW lnh+a7a)  
#undef THIS_FILE c_.-b=zm  
static char THIS_FILE[] = __FILE__; };,/0Fu  
#endif l_{8+\`!  
#define IDM_SHELL WM_USER+1 SeEw.;Xw  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }Fa%%}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *?t%0){  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &nj&:?w  
class CAboutDlg : public CDialog DyO$P#~?  
{ M Hi8E9_O  
 public: i47j lyH  
  CAboutDlg(); SA;#aj}rV  
  // Dialog Data z6*<V5<7  
  //{{AFX_DATA(CAboutDlg) J2VTo: In  
  enum { IDD = IDD_ABOUTBOX }; A+getdr  
  //}}AFX_DATA x Q4%e[/  
  // ClassWizard generated virtual function overrides #Sh <Ih  
  //{{AFX_VIRTUAL(CAboutDlg) h-#1U3d  
 protected: fv!?Ga(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o-C#|t3hH  
  //}}AFX_VIRTUAL 7f{=w, U  
  // Implementation \%0n}.A  
 protected:  _; Y`  
  //{{AFX_MSG(CAboutDlg) ?6^|ZtB  
  //}}AFX_MSG Yg9joNBh  
  DECLARE_MESSAGE_MAP() c>:R3^\lwx  
}; Cbm\h/PXl  
NZ0O,} m  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /Ncm^b4  
{ c;2#,m^  
 //{{AFX_DATA_INIT(CAboutDlg) Wb}c=hZv  
 //}}AFX_DATA_INIT O%8EZyu  
} z4X}O {  
k,yZ[n|`  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eWJ`$"z  
{ kM8{C w  
 CDialog::DoDataExchange(pDX); aj^wRzJ}zA  
 //{{AFX_DATA_MAP(CAboutDlg) V[o`\|<  
 //}}AFX_DATA_MAP G fEX>  
} QX4ai3v  
6!'3oN{  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 9h4({EE2t  
 //{{AFX_MSG_MAP(CAboutDlg) EJ@p-}I!  
 // No message handlers V w||!d  
 //}}AFX_MSG_MAP @a:>$t  
END_MESSAGE_MAP() !K f#@0E..  
4%nE*H%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) R_XR4)(<  
: CDialog(CCaptureDlg::IDD, pParent) a2'^8;U*_  
{ C?Bl{4-P}*  
 //{{AFX_DATA_INIT(CCaptureDlg) w-wV3Q6X  
  m_bControl = FALSE; ,I1 RV  
  m_bAlt = FALSE; ZOCDA2e(j  
  m_bShift = FALSE; T&4qw(\G  
  m_Path = _T("c:\\"); [Zei0O  
  m_Number = _T("0 picture captured."); .sC?7O =  
  nCount=0; /+Lfrt  
  bRegistered=FALSE; ,(8;y=wux  
  bTray=FALSE; tg]x0#@s  
 //}}AFX_DATA_INIT Bp8'pj;~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 (q+)'H%iK  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n8*;lK8  
} u/cg|]x&T  
)E@A0W  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) V=:'SL*3|  
{ 4RSHZAJg  
 CDialog::DoDataExchange(pDX); vVE2m=!v  
 //{{AFX_DATA_MAP(CCaptureDlg) :8CvRO*<  
  DDX_Control(pDX, IDC_KEY, m_Key); I)A`)5="5  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); mEw ~yOW]M  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *%{gYpn  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Oo"^%F~%  
  DDX_Text(pDX, IDC_PATH, m_Path); Og,$ sH}`  
  DDX_Text(pDX, IDC_NUMBER, m_Number); <Utnz)  
 //}}AFX_DATA_MAP LaQ-=;(`  
} 28 8XF9B^  
1pArZzm>  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ='`/BY(m[  
//{{AFX_MSG_MAP(CCaptureDlg) nqInb:  
 ON_WM_SYSCOMMAND() $ s9Vrw0Z  
 ON_WM_PAINT() dZi"$ g  
 ON_WM_QUERYDRAGICON() yzqVz_Fi*W  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b0lq\9  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) emCM\|NQg&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5$V_Hj  
//}}AFX_MSG_MAP tmQH|'>>  
END_MESSAGE_MAP() N5a*7EJv+  
;W>k@L  
BOOL CCaptureDlg::OnInitDialog() -$\+' \  
{ b )B? F  
 CDialog::OnInitDialog();  o4|M0  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !o:f$6EA~C  
 ASSERT(IDM_ABOUTBOX < 0xF000); spt6]"Ni  
 CMenu* pSysMenu = GetSystemMenu(FALSE); &*+'>UEe5  
 if (pSysMenu != NULL) &l!4mxwr`  
 { 3AU;>D^5  
  CString strAboutMenu; 7=;R& mqC  
  strAboutMenu.LoadString(IDS_ABOUTBOX); V5UF3'3;}  
  if (!strAboutMenu.IsEmpty()) .Y&)4+ckL  
  { a!=D[Gz*5  
   pSysMenu->AppendMenu(MF_SEPARATOR); .&DhN#EN0  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7Zlw^'q$:L  
  } wK?vPS  
 } r>o63Q:  
 SetIcon(m_hIcon, TRUE); // Set big icon  #"@|f  
 SetIcon(m_hIcon, FALSE); // Set small icon ~_/(t'9  
 m_Key.SetCurSel(0); G"h'_7  
 RegisterHotkey(); vX/T3WV  
 CMenu* pMenu=GetSystemMenu(FALSE); LDPUD'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); uG,5BV.M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f|\onHI)>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); f&Gt|  
 return TRUE; // return TRUE unless you set the focus to a control KrQ1GepJ  
} E=nIRG|g  
bbE!qk;hEP  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ?l9XAW t\  
{ 4 o Fel.o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) o]4*|ARPs  
 { 5>[u `  
  CAboutDlg dlgAbout; Ff)8Q.m  
  dlgAbout.DoModal(); [ CQ+p!QZ  
 } 'Gj3:-xqL  
 else PvPOU"  
 { 4K\G16'$v  
  CDialog::OnSysCommand(nID, lParam); e|"WQ>  
 } _852H$H\  
} EV]1ml k$  
4h|c<-`>t  
void CCaptureDlg::OnPaint() k>;`FFQU>  
{ F1*>y  
 if (IsIconic()) IxY|>5z  
 { uvkz'R=  
  CPaintDC dc(this); // device context for painting T&6l$1J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); os=e|vkB*  
  // Center icon in client rectangle l9{hq/V  
  int cxIcon = GetSystemMetrics(SM_CXICON); -|$@-fY;  
  int cyIcon = GetSystemMetrics(SM_CYICON); v[1aW v:  
  CRect rect; "~sW"n(F_  
  GetClientRect(&rect); KcWN,!G  
  int x = (rect.Width() - cxIcon + 1) / 2; Bs^aII$  
  int y = (rect.Height() - cyIcon + 1) / 2; d; boIP`M;  
  // Draw the icon ~vm%6CABM  
  dc.DrawIcon(x, y, m_hIcon); OP[  @k  
 } +r2+X:#~T  
 else :CG`t?N9M  
 { +$ 'Zf0U  
  CDialog::OnPaint(); D4eDHq  
 } oB(?_No7  
} .*OdqLz  
BC^ :=  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9ijfRqI=x  
{ L/$H"YOv  
 return (HCURSOR) m_hIcon; 'j#*6xD  
} dqU~`b9  
Ni9/}bb  
void CCaptureDlg::OnCancel() slCx w$  
{ Cio 1E-4  
 if(bTray) IaSR;/  
  DeleteIcon(); ,LHn90S  
  CDialog::OnCancel(); ?gA 8x  
} &* M!lxDN  
8{^kQ/]'|  
void CCaptureDlg::OnAbout() - YEZ]:"  
{ q+yQwX{  
 CAboutDlg dlg; )1?y 8_B  
 dlg.DoModal(); *7uH-u"5d  
} T6\[iJI|  
Ytn9B}%o  
void CCaptureDlg::OnBrowse() ^9v4OUG  
{ $0W|26;  
 CString str; u|\1h LXX  
 BROWSEINFO bi; bV^rsJm  
 char name[MAX_PATH]; Z@4Ar fl  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); q }3`|'3  
 bi.hwndOwner=GetSafeHwnd(); KjD/o?JUr  
 bi.pszDisplayName=name; }7b%HTF=  
 bi.lpszTitle="Select folder"; W: z6Koc0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )3cAQ'w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); m+ =] m_  
 if(idl==NULL) ^um<bWNc  
  return; s:n6rG  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); sA+ }TNhq  
 str.ReleaseBuffer(); )W^F2-{  
 m_Path=str; A#e%^{q$  
 if(str.GetAt(str.GetLength()-1)!='\\') wW Lj?;bx  
  m_Path+="\\"; hZm"t/aKc  
 UpdateData(FALSE); yl'u'-Zb6  
} )*$lp'~7N  
Akq2 d;  
void CCaptureDlg::SaveBmp() j * %  
{ `}p0VmD{NE  
 CDC dc; A @i  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); W_JlOc!y  
 CBitmap bm; * ` JYC  
 int Width=GetSystemMetrics(SM_CXSCREEN); [*Z;\5&P  
 int Height=GetSystemMetrics(SM_CYSCREEN); akmkyrz'&  
 bm.CreateCompatibleBitmap(&dc,Width,Height); K%t*8 4j  
 CDC tdc; D, k6$`  
 tdc.CreateCompatibleDC(&dc); J"0`%'*/  
 CBitmap*pOld=tdc.SelectObject(&bm); ?e%ZOI  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); oh4E7yN  
 tdc.SelectObject(pOld);  {y)=eX9  
 BITMAP btm; (^ J I%>  
 bm.GetBitmap(&btm); Pd8![Z3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; % aP!hy  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Lc}LGq!  
 BITMAPINFOHEADER bih; n'"/KS+_  
 bih.biBitCount=btm.bmBitsPixel; ><4<yj1  
 bih.biClrImportant=0; !hm]fh_j  
 bih.biClrUsed=0; [CY9^N  
 bih.biCompression=0; G?yLo 'Ulo  
 bih.biHeight=btm.bmHeight; @ JGP,445  
 bih.biPlanes=1; F|`Hm  
 bih.biSize=sizeof(BITMAPINFOHEADER); Mc)}\{J  
 bih.biSizeImage=size; {4l8}w  
 bih.biWidth=btm.bmWidth; 91/Q9xY  
 bih.biXPelsPerMeter=0; )7hqJa-V  
 bih.biYPelsPerMeter=0; L7l FtX+b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); sWhZby7  
 static int filecount=0; aHD]k8 m z  
 CString name; Fw_#N6Q  
 name.Format("pict%04d.bmp",filecount++); HVRZ[Y<^  
 name=m_Path+name; 6W/`07 '  
 BITMAPFILEHEADER bfh; :'Vf g[Uq  
 bfh.bfReserved1=bfh.bfReserved2=0; td$E/h=3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &0d# Y]D4`  
 bfh.bfSize=54+size; `Gs9Xmc|  
 bfh.bfOffBits=54; 9i:L&dN  
 CFile bf; 6%'QjwM_  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @@f"%2ZR[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yWmJ~/*lG  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); `>o{P/HN  
  bf.WriteHuge(lpData,size); -E[Kml~U  
  bf.Close(); 9+|$$)  
  nCount++; /WcG{Wdp  
 } 6bg ;q(*7  
 GlobalFreePtr(lpData); Dm981t>wL  
 if(nCount==1) #<fRE"v:Q  
  m_Number.Format("%d picture captured.",nCount); aj='b.2)  
 else PI {bmZ  
  m_Number.Format("%d pictures captured.",nCount); 8]c2r%J  
  UpdateData(FALSE); 4Z3su^XR  
} ijv(9mR  
{p2!|A&a  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) hE{K=Tz$  
{ `bq<$e  
 if(pMsg -> message == WM_KEYDOWN) J0WxR&%a)  
 { )$2QZ qX  
  if(pMsg -> wParam == VK_ESCAPE) [g |_~h  
   return TRUE; =IZT(8  
  if(pMsg -> wParam == VK_RETURN) "x0^#AVg  
   return TRUE; s S+MqBh&I  
 } Fe*R  
 return CDialog::PreTranslateMessage(pMsg); !)f\%lb  
} CO/]wS  
T=DbBy0-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fgTg7 m  
{ :U|1xgB  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P\tB~SZ*  
  SaveBmp(); bIDj[-CDG  
  return FALSE; j^sg6.Z*  
} 0D.Mke )  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ uh0VFL*@  
 CMenu pop; /xBb[44z8  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); z _$%-6  
 CMenu*pMenu=pop.GetSubMenu(0); |l^uEtG  
 pMenu->SetDefaultItem(ID_EXITICON); s[>,X#7 y  
 CPoint pt; 6yG^p]zZ  
 GetCursorPos(&pt); ;+R&}[9,A)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u {cW:  
 if(id==ID_EXITICON)  tU5zF.%  
  DeleteIcon(); QW~E&B%  
 else if(id==ID_EXIT) =ZznFVJ`={  
  OnCancel(); /KaZH R.  
 return FALSE; 5DU6rks%  
} #P9~}JB3,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1s&zMWC  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) t.y2ff<[U  
 AddIcon(); *8A  
 return res; x;KOqfawv  
} "S]0  
`g?Negt\v  
void CCaptureDlg::AddIcon() M] %?>G  
{ bHnT6Icom  
 NOTIFYICONDATA data; $99n&t$Y  
 data.cbSize=sizeof(NOTIFYICONDATA); u@) U"FZ  
 CString tip; R%WCH?B<}  
 tip.LoadString(IDS_ICONTIP); G$"h&Xy1c  
 data.hIcon=GetIcon(0); n38p!oS  
 data.hWnd=GetSafeHwnd(); @i_FTN  
 strcpy(data.szTip,tip); Vm(y7}Aq{  
 data.uCallbackMessage=IDM_SHELL; BwEN~2u6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; fplow  
 data.uID=98; 05#1w#i  
 Shell_NotifyIcon(NIM_ADD,&data); &BLJT9Frx  
 ShowWindow(SW_HIDE); gs[uD5oo<  
 bTray=TRUE; ;8&3 dm]  
} 2zA4vZkbcw  
p4rL}Jm&  
void CCaptureDlg::DeleteIcon() \:'/'^=#|  
{ Q8tL[>Xt  
 NOTIFYICONDATA data; U}[d_f  
 data.cbSize=sizeof(NOTIFYICONDATA); ?3,:-"(@p  
 data.hWnd=GetSafeHwnd(); | j`@eF/"  
 data.uID=98; I_#kgp  
 Shell_NotifyIcon(NIM_DELETE,&data); {]!mrAjD  
 ShowWindow(SW_SHOW); ,-c6dS   
 SetForegroundWindow(); d"mkL-  
 ShowWindow(SW_SHOWNORMAL); [b%D3-}'  
 bTray=FALSE; XEp{VC@=  
} ^mDe08. %b  
I*{ nP)^9  
void CCaptureDlg::OnChange() 65P0,b6"OT  
{ HZB>{O  
 RegisterHotkey(); Vb;*m5,?:  
} nNV'O(x}  
ZF8 yw(z  
BOOL CCaptureDlg::RegisterHotkey() $9#H04.x  
{ 6<SAa#@ey  
 UpdateData(); xh,qNnGGi  
 UCHAR mask=0; [PM 2\#K  
 UCHAR key=0; }OR@~V{Gj  
 if(m_bControl) G6P?2@  
  mask|=4; ]@c+]{  
 if(m_bAlt) L|+~"'l  
  mask|=2; Gr'  CtO  
 if(m_bShift) :{v#'U/^  
  mask|=1; Yui3+}Ms  
  key=Key_Table[m_Key.GetCurSel()]; hbDXo:  
 if(bRegistered){ dr}`H,X"3  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); {hjhL: pg  
  bRegistered=FALSE; K(rWNO  
 } 6dt]`zv/  
 cMask=mask; BLdvyVFx  
 cKey=key; l"T44CL;  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 'RR~7h  
 return bRegistered; '~<m~UXvD#  
} d#Y^>"|$.  
P>C~ i:4n  
  四、小结 LVfF[  
DB|Y  
  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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