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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: 8<#U9]  
  ;[0&G6g  
  一、实现方法 tiaR4PB  
L/r@ S'  
  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: IMLsQit*  
f@V3\Z/6E  
#pragma data_seg("shareddata") & eZfQ27$  
HHOOK hHook =NULL; //钩子句柄 O>0VTW  
UINT nHookCount =0; //挂接的程序数目 `)>7)={  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 i6PM<X,{;  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 '/%zi,0  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey UVu DQ  
static int KeyCount =0; DPHQ,dkp  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^>$P)=O:v  
#pragma data_seg() ]F*3"y?)2  
<,%:   
  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。 `iG,H[t+j  
VM=+afY5M  
  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: D&:yMp(  
o4^Fo p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR yX/";Oe  
cKey,UCHAR cMask) NY B[Zyp  
{ 12`_;[37  
 BOOL bAdded=FALSE; '3(l-nPiG^  
 for(int index=0;index<MAX_KEY;index++){ arZ@3]X%a  
  if(hCallWnd[index]==0){ ,TC;{ $O5  
   hCallWnd[index]=hWnd; $&P?l=UG  
   HotKey[index]=cKey; rP=sG;d  
   HotKeyMask[index]=cMask; f"5g>[ 1  
   bAdded=TRUE; +Ezgn/bS&  
   KeyCount++; JWO=!^  
   break; =P77"Dd  
  } TYgQJW?  
 } j ) vlM+  
 return bAdded; u:gtOjk2  
} 4rNL":"O  
//删除热键 3 /6/G}s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ||B;o-  
{ A2H4k|8  
 BOOL bRemoved=FALSE; l5t2\Fl  
 for(int index=0;index<MAX_KEY;index++){ Ss ?CfRM  
  if(hCallWnd[index]==hWnd){ T=Z.U$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M^madx6`  
    hCallWnd[index]=NULL; u' Qd,  
    HotKey[index]=0; U yqXMbw@  
    HotKeyMask[index]=0; B5am1y{P#  
    bRemoved=TRUE; 8nNsrat  
    KeyCount--; C 'mL&  
    break; H}0dd"  
   } Oxx^[ju~  
  } ,w)p"[^b  
 } F phDF  
 return bRemoved; $a;]_Y  
} X=X\F@V:u  
$ItF])Bj5N  
ZXb0Y2AVx  
  DLL中的钩子函数如下: wdE?SDs  
%'Xk)-+y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vR7HF*8  
{ k!XhFWb  
 BOOL bProcessed=FALSE; w Fn[9_`*  
 if(HC_ACTION==nCode) l95<QI  
 { ><?BqRm+  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 `m~syKz4A  
   switch(wParam) V`hu,Y;%  
   {  f6=w3RS  
    case VK_MENU: D$e B ,~  
     MaskBits&=~ALTBIT; x2VBm$>  
     break; WgGm#I>K  
    case VK_CONTROL: V~{ _3YY  
     MaskBits&=~CTRLBIT; ,K9f_bv  
     break; t` ^ Vb-  
    case VK_SHIFT: rJfqA@  
     MaskBits&=~SHIFTBIT; *gsAn<  
     break; u V6g[J  
    default: //judge the key and send message yl]FP@N(  
     break; 2YwVU.*>  
   } "i)Yvh[y  
   for(int index=0;index<MAX_KEY;index++){ do/)~9[4\  
    if(hCallWnd[index]==NULL) mXWTm%'[  
     continue; I=DLPgzO9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &x:JD1T}  
    { ztM<J+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  :S %lv  
     bProcessed=TRUE; @!tVr3;N$  
    } 9L eNe}9v  
   } v[k5.\No  
  } \&xl{64  
  else if((lParam&0xc000ffff)==1){ //有键按下 Mio>{%/  
   switch(wParam) g9h(sLSF  
   { XFZ~ #DT&  
    case VK_MENU: h\[\\m O  
     MaskBits|=ALTBIT; AD5) .}[F  
     break; :Waox"#=g  
    case VK_CONTROL: "&YYO#YO  
     MaskBits|=CTRLBIT; l3i,K^YL  
     break; Eh8Pwt7C@  
    case VK_SHIFT: 2h~-  
     MaskBits|=SHIFTBIT; f?fKhu2  
     break; .q`{Dgc~  
    default: //judge the key and send message #G^A-yjn  
     break; +54aO  
   } Tt# bg1  
   for(int index=0;index<MAX_KEY;index++){ D@Da0  
    if(hCallWnd[index]==NULL) J@"utY6N  
     continue; Xg<[fwW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'w/qcD-  
    { 2i=H"('G)+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PK6iY7Qp)  
     bProcessed=TRUE; !-]C;9 Zd  
    } ~XM[>M\qB  
   } nn~YK  
  } B;zt#H4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 - Xupq/[,  
   for(int index=0;index<MAX_KEY;index++){ %FkLQ+v/<  
    if(hCallWnd[index]==NULL) b}z`BRCc  
     continue; 6Y*;{\Rd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) NC23Z0y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '%iPVHK7  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +",S2Qmo  
   } {5Lj8 N5  
  } ('k<XOi  
 } ?s%v0cF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +=@^i'  
} '"YYj$> '  
R'K/t|MC  
  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: eBr4O i  
c=p=-j=.J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X~U >LLr  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `x8B n"  
8QgA@y"  
  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: u</8w&!  
I+?hG6NM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rs8\)\z  
{ qk{'!Ii  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) GuQRn  
 { %uDG75KP{  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Gm8E<iTP  
  SaveBmp(); pK_?}~  
  return FALSE; 9(1rh9`=  
 } #*$p-I=  
 …… //其它处理及默认处理 'Z!G a.I  
} iw]k5<qKj  
f[~1<;|-  
~5aE2w0K   
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 lJ  
HOW7cV'X  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 .J.vC1 4gi  
b[^{)$(  
  二、编程步骤 x"B' zP  
Utl t<  
  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"; bY8GA  
M?&zY "c  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Buc_9Kzw<+  
70gg4BS  
  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; oVO.@M#  
D,;\F,p  
  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; Iin#Wd-/  
b{[*N  
  5、 添加代码,编译运行程序。 U@lV  
yyl#{Nl@t  
三、程序代码 QJ X/7RA  
 @|A|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL khX|" d360  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 2: ^njqX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ? Nj)6_&  
#if _MSC_VER > 1000 ^$?qT60%d|  
#pragma once APBK9ky  
#endif // _MSC_VER > 1000 :h5J r8  
#ifndef __AFXWIN_H__ MgJ5B(c  
#error include 'stdafx.h' before including this file for PCH ]#eh&jw  
#endif 7Ua7A  
#include "resource.h" // main symbols CY"i-e"q<Q  
class CHookApp : public CWinApp /'&;Q7!)  
{ e1(h</MU2  
 public: RXSf,O  
  CHookApp(); n~r 9!m$<  
  // Overrides |ng%PQq)  
  // ClassWizard generated virtual function overrides =:7$/T'Qg  
  //{{AFX_VIRTUAL(CHookApp) [?KIN_e#  
 public: nB@UKX  
  virtual BOOL InitInstance(); @z,*K_AKr  
  virtual int ExitInstance(); KFhG(   
  //}}AFX_VIRTUAL wyQb5n2`;~  
  //{{AFX_MSG(CHookApp) V'wi^gq  
  // NOTE - the ClassWizard will add and remove member functions here. K&`Awv  
  // DO NOT EDIT what you see in these blocks of generated code ! ohZx03  
  //}}AFX_MSG x7ATI[b[  
  DECLARE_MESSAGE_MAP() NPU^) B  
}; iD_T P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); NB)t7/Us  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F? ]N8W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DdjCn`jqlf  
BOOL InitHotkey(); 2<6j1D^jM  
BOOL UnInit(); Go8F5a@j  
#endif BQrL7y  
o}D![/  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. *@M3p}',M  
#include "stdafx.h" %J P!{mqj  
#include "hook.h" Da,Tav%b  
#include <windowsx.h> 8 njuDl  
#ifdef _DEBUG X#J6Umutm  
#define new DEBUG_NEW L(o#4YH}>J  
#undef THIS_FILE (cV  
static char THIS_FILE[] = __FILE__; bx;f`8SN  
#endif qu{mqkfN>  
#define MAX_KEY 100 J_"3UZ~&  
#define CTRLBIT 0x04 ejcwg*i  
#define ALTBIT 0x02 3wt  
#define SHIFTBIT 0x01 i Ci>zJ  
#pragma data_seg("shareddata") rK=6]j(K  
HHOOK hHook =NULL; hPO>,j^  
UINT nHookCount =0; Q<=Y  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >4)g4~'n!  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Rt4di^v  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey KTmaglgp  
static int KeyCount =0; Bymny>.M  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift WYO\'W  
#pragma data_seg() Y3o Mh,  
HINSTANCE hins; i?>Hr|  
void VerifyWindow(); lX;mhJj!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) MUwVG>b8J~  
//{{AFX_MSG_MAP(CHookApp) /$`;r2LG  
// NOTE - the ClassWizard will add and remove mapping macros here. h}6_ybmZ  
// DO NOT EDIT what you see in these blocks of generated code! tgN92Q.i6T  
//}}AFX_MSG_MAP "iek,Y}j7  
END_MESSAGE_MAP() Z3;=w%W  
> V%Q O>C  
CHookApp::CHookApp() h6QWH  
{ <94WZ?{p  
 // TODO: add construction code here, |5ONFd e"0  
 // Place all significant initialization in InitInstance dU+0dZdKO  
} &o.iUk  
vInFo.e[4  
CHookApp theApp; g!^J,e=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Oxa5Kfpa  
{ el*9 Ih  
 BOOL bProcessed=FALSE; TzF0/T!  
 if(HC_ACTION==nCode) *.8:'F  
 { P(_(w 9  
  if((lParam&0xc0000000)==0xc0000000){// Key up 2Ow<`[7  
   switch(wParam) M&e8zS  
   { EAyukM2  
    case VK_MENU: q$>_WF#||  
     MaskBits&=~ALTBIT; Wo3'd|Y~i  
     break; n~%}Z[5D  
    case VK_CONTROL: !sK#zAR2  
     MaskBits&=~CTRLBIT; DQ_ 2fX~)  
     break; <!!nI%NC  
    case VK_SHIFT: )%#?3X^sI  
     MaskBits&=~SHIFTBIT; I#c(J  
     break; iS05YW  
    default: //judge the key and send message dq1TRFu  
     break; j+0.= #{??  
   } U.Hdbmix  
   for(int index=0;index<MAX_KEY;index++){ fI}c 71b`  
    if(hCallWnd[index]==NULL) %!wq:~B1  
     continue; @_O3&ZK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .zwVCW,u  
    { K+> V|zKuk  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); a7 )@BzF#  
     bProcessed=TRUE; R0IF'  
    } ?N _)>&b  
   }  T{Hf P  
  } ZgBckb  
  else if((lParam&0xc000ffff)==1){ //Key down G5u meqYC  
   switch(wParam) n)CH^WHL&  
   { Rp eBm#E2  
    case VK_MENU: 'FxYMSZS$  
     MaskBits|=ALTBIT; m)k-uWc$C  
     break; enPYj.*/0  
    case VK_CONTROL: Hdna{@~  
     MaskBits|=CTRLBIT; Nh:4ys!P  
     break; U,HS;wo;t  
    case VK_SHIFT: 6vWii)O.D  
     MaskBits|=SHIFTBIT; JD-Becz  
     break; ">,K1:(D  
    default: //judge the key and send message Ou!)1UFI  
     break; kaC+I"4c  
   } B[7A  
   for(int index=0;index<MAX_KEY;index++) FvA|1c  
   { `D"1 gD}{A  
    if(hCallWnd[index]==NULL) QX+Y(P`vMK  
     continue; "i(U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _Q^y_f  
    { W U0UG$o`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )u Qvt-  
     bProcessed=TRUE; ChVY Vx(  
    } 8E-Ip>{>  
   } c}'Xoc  
  } &m4f1ZO*  
  if(!bProcessed){ l]>!`'sJL  
   for(int index=0;index<MAX_KEY;index++){ -s33m]a;  
    if(hCallWnd[index]==NULL) <>?^4NC<M  
     continue; L:^Y@[f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) x3_,nl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); R/rcXX7%  
   } 9Q=>MOB-  
  } qw)Key  
 } %0 qc@4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P;>!wU~*  
} 8nf4Jk8r  
\`&xprqAw  
BOOL InitHotkey() kp.|gzA6  
{ Ltl]j*yei  
 if(hHook!=NULL){ W n6,U=$3  
  nHookCount++; IY~ {)X  
  return TRUE; 5@iy3olP  
 } Sn0Xl3yr  
 else $'y1 Po'2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ID+,[TM`  
  if(hHook!=NULL) W=F3XYS  
   nHookCount++; -$b?rt]h1g  
  return (hHook!=NULL); eA10xpM0  
} 03] r*\  
BOOL UnInit() i >J:W"W   
{ DWdLA~'t  
 if(nHookCount>1){ ym[+Rw  
  nHookCount--; ,A^L=+  
  return TRUE; 9M;I$_U`vj  
 } {#0Tl  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t3 K>\ :  
 if(unhooked==TRUE){ z 3Zu C{  
  nHookCount=0;  L2k;f]  
  hHook=NULL; 01-p `H+  
 } Q.<giBh  
 return unhooked; D8a)(wm  
} 5#P: "U  
#%qqL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^?#@[4?"  
{ pDP33`OFh  
 BOOL bAdded=FALSE; <%he  o  
 for(int index=0;index<MAX_KEY;index++){ rT o%=0P  
  if(hCallWnd[index]==0){ ~;TV74~rr  
   hCallWnd[index]=hWnd; E8+8{ #f;  
   HotKey[index]=cKey; vsjM3=  
   HotKeyMask[index]=cMask; gp%tMT I1  
   bAdded=TRUE; Q4#\{" N!  
   KeyCount++; #T Z!#,q  
   break; 3SmqXPOw  
  } 7Zhli Y1  
 } |_!PD$i-  
 return bAdded; ER/\ +Z#Z  
} B>1M$3`E  
0H; "5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |WQD=J%~(  
{ oJhEHx[f  
 BOOL bRemoved=FALSE; hcj{%^p  
 for(int index=0;index<MAX_KEY;index++){ {E3;r7  
  if(hCallWnd[index]==hWnd){ 4;08n|C  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ='KPT1dW*  
    hCallWnd[index]=NULL; bn5"dxV  
    HotKey[index]=0; 9tW3!O^_  
    HotKeyMask[index]=0; -DA;KWYS  
    bRemoved=TRUE; HW^{;'kH~  
    KeyCount--; (2n3exx  
    break; >3v0yh_3  
   } wHq('+{=&  
  } r#ks>s  
 } #d3[uF]OmW  
 return bRemoved; ))c*_n  
} 5L/Yi  
Q,ZkeWQ7%  
void VerifyWindow() 9c#L{in  
{ D-;J;m \  
 for(int i=0;i<MAX_KEY;i++){ AviT+^7E  
  if(hCallWnd!=NULL){ Kv(Y }  
   if(!IsWindow(hCallWnd)){ ^!N;F"  
    hCallWnd=NULL; VG? yL2y  
    HotKey=0; 3 t~X:  
    HotKeyMask=0; <t% Ao,"  
    KeyCount--; Fj '\v#h  
   } Rh5@[cg%  
  } #Lu4OSM+  
 } 8Ng) )7g!  
} 1t!&xvhG  
|j\eBCnH3  
BOOL CHookApp::InitInstance() OFJJ-4[_3  
{ Yk(NZ3O  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); z1z =P%WK  
 hins=AfxGetInstanceHandle(); \UV T_=Y  
 InitHotkey(); F0DPS:c  
 return CWinApp::InitInstance(); b#bO=T$e-  
} 89 _&X[X  
#MmmwPB_  
int CHookApp::ExitInstance() J$o[$G_Z  
{ JI28}Cxs0  
 VerifyWindow(); {'cs![U  
 UnInit(); FZ;Y vdX6  
 return CWinApp::ExitInstance(); uOy\{5s8  
} }s8*QfK>  
EfMG(oI  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H{p[Ghp  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +z{x 7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_  ."$=  
#if _MSC_VER > 1000 BN bb&]  
#pragma once UFSEobhg&5  
#endif // _MSC_VER > 1000 O :5ldI  
rElG7[+)p  
class CCaptureDlg : public CDialog LWp?U!N  
{ LGdf_M-f  
 // Construction 0~LnnD N  
 public: &q kl*#]  
  BOOL bTray; wpPxEp/  
  BOOL bRegistered; FuRn%)DA5  
  BOOL RegisterHotkey(); >rQ)|W=i  
  UCHAR cKey; [C*X k{e  
  UCHAR cMask; G>?x-!9qcH  
  void DeleteIcon();  F<XD^sO  
  void AddIcon(); 0hEF$d6U  
  UINT nCount; -M(58/y  
  void SaveBmp(); y"{UN M|R  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~XN]?5GQf  
  // Dialog Data GcU(:V2o  
  //{{AFX_DATA(CCaptureDlg) zXA= se0U  
  enum { IDD = IDD_CAPTURE_DIALOG }; -0[>}!l=G  
  CComboBox m_Key; n~L'icD[  
  BOOL m_bControl; [xH2n\7  
  BOOL m_bAlt; IWSEssP  
  BOOL m_bShift; av$\@4I  
  CString m_Path; #dXZA>b9  
  CString m_Number;  @=^jpSnZ  
  //}}AFX_DATA vCrWA-q#  
  // ClassWizard generated virtual function overrides vM$#m1L?  
  //{{AFX_VIRTUAL(CCaptureDlg) Xqq?S  
 public: o>!~*b';g,  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9 ;! uV>-H  
 protected: ** "s~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \n('KVbf  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); M\x7=*\  
  //}}AFX_VIRTUAL lVO(9sl*i  
  // Implementation G+%5V5GS  
 protected: FZLzu  
  HICON m_hIcon; xfZ9&g  
  // Generated message map functions J^e|"0d  
  //{{AFX_MSG(CCaptureDlg) S a#d?:L  
  virtual BOOL OnInitDialog(); /-cX(z 7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); A*?/F:E  
  afx_msg void OnPaint(); u+"hr"}${  
  afx_msg HCURSOR OnQueryDragIcon(); 8wNU2yH+D  
  virtual void OnCancel(); 3vEjf  
  afx_msg void OnAbout(); ~S~x@&yR  
  afx_msg void OnBrowse(); ESXU, qK]v  
  afx_msg void OnChange(); ui:>eYv  
 //}}AFX_MSG }tg:DG  
 DECLARE_MESSAGE_MAP() L>K39z~,  
}; n$Oky-P"  
#endif d%"@#bB  
{yl/T:Bh&  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `~s,W.Eu4  
#include "stdafx.h" N*c?Er@8U  
#include "Capture.h" ~P.-3  
#include "CaptureDlg.h" 4h0jX 9  
#include <windowsx.h> mqfEs0~I  
#pragma comment(lib,"hook.lib") ](( >i%%~  
#ifdef _DEBUG &bRxy`ZH  
#define new DEBUG_NEW k}owEBsn}  
#undef THIS_FILE uR[PKLh  
static char THIS_FILE[] = __FILE__; I'wk/  
#endif d}A2I  
#define IDM_SHELL WM_USER+1 rSFXchD/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); mU0r"\**c3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NU 6Kh7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4N^Qd3[d  
class CAboutDlg : public CDialog :j50]zLy{  
{ hghto \G5Y  
 public: x%Y a*T  
  CAboutDlg(); 4wEpyQ|L  
  // Dialog Data %v6]>FNP'3  
  //{{AFX_DATA(CAboutDlg) (Os OPTp  
  enum { IDD = IDD_ABOUTBOX }; D -\'P31  
  //}}AFX_DATA "Y J;-$rb  
  // ClassWizard generated virtual function overrides (2a "W`  
  //{{AFX_VIRTUAL(CAboutDlg) bm]dz;ljh  
 protected: `E1_S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "Z1&z-   
  //}}AFX_VIRTUAL %2FCpre;  
  // Implementation I}CA-8  
 protected: DcvmeGl  
  //{{AFX_MSG(CAboutDlg) ():?FJ M  
  //}}AFX_MSG ,, -[P*@  
  DECLARE_MESSAGE_MAP() 28L'7  
}; 1Z{p[\k  
)@&?i.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d?+oT0pCH  
{ bT6)(lm  
 //{{AFX_DATA_INIT(CAboutDlg) ff+9(P>*  
 //}}AFX_DATA_INIT frO/ nx|9  
} q.K$b  
JnKbd~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) GeW$lA I  
{ 9/qS*Zdh)  
 CDialog::DoDataExchange(pDX); as47eZ0\  
 //{{AFX_DATA_MAP(CAboutDlg) ?@ye*%w_  
 //}}AFX_DATA_MAP 1RO gUJ;  
} 1VM5W!}  
\/dm}' `  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ur quVb  
 //{{AFX_MSG_MAP(CAboutDlg) &+|4(d1  
 // No message handlers b5,}w:  
 //}}AFX_MSG_MAP y5tAp  
END_MESSAGE_MAP() &JQ@(w  
%<o$ J~l~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ezy5Jqk5%  
: CDialog(CCaptureDlg::IDD, pParent) K*i1! "w  
{ [LEh  
 //{{AFX_DATA_INIT(CCaptureDlg) Hbj:CViYq  
  m_bControl = FALSE; #YMp,i  
  m_bAlt = FALSE; <$Kv^Y*  
  m_bShift = FALSE; \EfwS% P  
  m_Path = _T("c:\\"); |@9I5Eg)iE  
  m_Number = _T("0 picture captured."); &@Gu~)^(  
  nCount=0; m.g@S30  
  bRegistered=FALSE; vpw&"?T  
  bTray=FALSE; "+ JwS  
 //}}AFX_DATA_INIT 5x'y{S<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9%k.GE  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OU5|m%CmO  
} P!&CH4+  
:^L]Da3  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) SG o:FG  
{ uT t:/gm  
 CDialog::DoDataExchange(pDX); FwzA_ nn  
 //{{AFX_DATA_MAP(CCaptureDlg) ')cgx9   
  DDX_Control(pDX, IDC_KEY, m_Key); 2g8P$+;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); `G5wiyH})  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ;Z~.54Pf{d  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); F0(Sv\<::  
  DDX_Text(pDX, IDC_PATH, m_Path); eBRP%<=>D  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2%yJo7f$[  
 //}}AFX_DATA_MAP ;GE u.PdxB  
} h*LL(ow5  
N~KRwsDH  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) t'/;Z:  
//{{AFX_MSG_MAP(CCaptureDlg) _o"3gfH&sJ  
 ON_WM_SYSCOMMAND() (dt_ D  
 ON_WM_PAINT() DyTk<L  
 ON_WM_QUERYDRAGICON() 1^>g>bn_"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 4gNRln-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) RL)3k8pk  
 ON_BN_CLICKED(ID_CHANGE, OnChange) d*(\'6?  
//}}AFX_MSG_MAP "8 mulE,  
END_MESSAGE_MAP() `*!>79_2C  
I*R$*/)  
BOOL CCaptureDlg::OnInitDialog() Oydmq,sVe(  
{ TmZ[?IL,  
 CDialog::OnInitDialog(); 6(^9D_"@  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ,(=]6V  
 ASSERT(IDM_ABOUTBOX < 0xF000); d iLl>z  
 CMenu* pSysMenu = GetSystemMenu(FALSE); lH>XIEj  
 if (pSysMenu != NULL) twS3J)UH  
 { 6N)1/=)  
  CString strAboutMenu; :P1c>:j[  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9 (.9l\h  
  if (!strAboutMenu.IsEmpty()) C7_T]e<  
  { i */U.'#  
   pSysMenu->AppendMenu(MF_SEPARATOR); E,:pIw  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9o'6es..@Z  
  } F7l:*r,O  
 } {xoo9jq-  
 SetIcon(m_hIcon, TRUE); // Set big icon xA E@cwg  
 SetIcon(m_hIcon, FALSE); // Set small icon EZfa0jJD  
 m_Key.SetCurSel(0); ck+rOGv7{Z  
 RegisterHotkey(); dkp[?f)x  
 CMenu* pMenu=GetSystemMenu(FALSE); -{%''(G  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); tP{$}cEY  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 291|KG  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); jP'b! 4  
 return TRUE; // return TRUE unless you set the focus to a control \ \}/2#1=c  
} `\0a5UFR  
K! j*:{  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) qE:DJy <  
{ 1y;zPJ<ntm  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "A+F&C>  
 { Y@Y(;C"SW  
  CAboutDlg dlgAbout; ;O11)u?/s|  
  dlgAbout.DoModal(); u.FDe2|[)  
 } 3:#rFb  
 else r2'rf pQ  
 { n"Vd"}sU.  
  CDialog::OnSysCommand(nID, lParam); T$;XJx  
 } Q0_W<+`  
} IW_D$pq  
4,DsB'  
void CCaptureDlg::OnPaint() =1[g`b  
{ VrxH6Y  
 if (IsIconic()) !l^AKn|  
 { ~m U_ `o  
  CPaintDC dc(this); // device context for painting kR(=VM JU  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 2f4c;YS  
  // Center icon in client rectangle lHqx}n@e  
  int cxIcon = GetSystemMetrics(SM_CXICON); jy2nn:1#^  
  int cyIcon = GetSystemMetrics(SM_CYICON); +}/!yQtH  
  CRect rect; 59]9-1" +  
  GetClientRect(&rect); [ 1GEe  
  int x = (rect.Width() - cxIcon + 1) / 2; @NE#P&f  
  int y = (rect.Height() - cyIcon + 1) / 2; b\S}?{m5  
  // Draw the icon W2N7  
  dc.DrawIcon(x, y, m_hIcon); D|:sSld @  
 } :/qO*&i,N  
 else kc[["w&  
 { &Qjl|2  
  CDialog::OnPaint(); -P&e4sV{  
 } i`'^ zR(`i  
} H-w|JH>g  
<z)G& h@  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?Fpl.t~  
{ )&Bv\Tfjt  
 return (HCURSOR) m_hIcon; j}l8k@f  
} 3>Snd9Q  
%/zZ~WIf  
void CCaptureDlg::OnCancel() w'XgW0j{  
{ efR$s{n!  
 if(bTray) NM.B=<Aw*  
  DeleteIcon(); `1]9(xwhQ0  
  CDialog::OnCancel(); f tDV3If  
} k;7.qhe:  
mO.U )tL[  
void CCaptureDlg::OnAbout() I9>*Yy5RNS  
{ q+~CA[H5K  
 CAboutDlg dlg; {Z.@-Tl_  
 dlg.DoModal(); tvRy8u;  
} UV.9 KcN.  
5 ZPUY  
void CCaptureDlg::OnBrowse() x~eEaD5m%J  
{ $uhDBmb  
 CString str; zK?[dO  
 BROWSEINFO bi; eS:e#>(  
 char name[MAX_PATH]; "cM5=;  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /vu!5?S  
 bi.hwndOwner=GetSafeHwnd(); <vDm(-i3  
 bi.pszDisplayName=name; >oDP(]YGg  
 bi.lpszTitle="Select folder"; xS1|Z|&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; e]?S-J'z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); F2'cL@E3  
 if(idl==NULL) [hbp#I~*[  
  return; #57z-x[1  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0+LloB  
 str.ReleaseBuffer(); W^Y0>W~  
 m_Path=str; ; bE6Y]"Rz  
 if(str.GetAt(str.GetLength()-1)!='\\') G9Tix\SpF  
  m_Path+="\\"; =U2n"du  
 UpdateData(FALSE); *pp1Wa7O  
} ^^uD33@_  
+9CUnRv  
void CCaptureDlg::SaveBmp() |pSoBA9U  
{ ]5/U}Um  
 CDC dc; GJPZ[bo  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ulJYJ+CC!  
 CBitmap bm; e]h'  
 int Width=GetSystemMetrics(SM_CXSCREEN); tb3fz")UC  
 int Height=GetSystemMetrics(SM_CYSCREEN); Ypj)6d  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,$$$_+m\  
 CDC tdc; oW6<7>1M7  
 tdc.CreateCompatibleDC(&dc); !H\GHA'DO]  
 CBitmap*pOld=tdc.SelectObject(&bm); .+h pxZ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Qpf]3  
 tdc.SelectObject(pOld); kH -b!  
 BITMAP btm; 0u2uYiE-l  
 bm.GetBitmap(&btm); HYmXPpse  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; hATy 3*4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |LH*)GrD*t  
 BITMAPINFOHEADER bih; uf] $@6)  
 bih.biBitCount=btm.bmBitsPixel; vyGLn  
 bih.biClrImportant=0; ,5*xE\9G  
 bih.biClrUsed=0; IQ~7vk()  
 bih.biCompression=0; mkzk$_  
 bih.biHeight=btm.bmHeight; =A 6O}0z  
 bih.biPlanes=1; %=y3  
 bih.biSize=sizeof(BITMAPINFOHEADER); Q}]kw}b  
 bih.biSizeImage=size; j],.`Y  
 bih.biWidth=btm.bmWidth; 1Z8oN3  
 bih.biXPelsPerMeter=0; ] Nipo'N;  
 bih.biYPelsPerMeter=0; aZ`ags ofk  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ; @~*z4U  
 static int filecount=0; I]1Hi?A2  
 CString name; |9$'?4F  
 name.Format("pict%04d.bmp",filecount++); 5V8C+k)  
 name=m_Path+name; :9#{p^:o  
 BITMAPFILEHEADER bfh; Fxx2vTV4ag  
 bfh.bfReserved1=bfh.bfReserved2=0; /+O8A}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 15DK \_;  
 bfh.bfSize=54+size; Hd`p_?3]  
 bfh.bfOffBits=54; w{x(YVS H  
 CFile bf; /,$\H  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ PGl-2Cr  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <W') ~o}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); % ul{nL:  
  bf.WriteHuge(lpData,size); z}&C(m:al  
  bf.Close(); BM~niW;k  
  nCount++; ){6)?[G  
 } UVUO}B@[S  
 GlobalFreePtr(lpData); })vr*[  
 if(nCount==1) E?U]w0g  
  m_Number.Format("%d picture captured.",nCount); u(WQWsN  
 else >ImM~SR)  
  m_Number.Format("%d pictures captured.",nCount); 5?0gC&WfN  
  UpdateData(FALSE); aZGDtzNG5h  
} ,GP4I3D  
1?#9K j{ql  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) <>Ddxmw  
{ `h5eej&s(  
 if(pMsg -> message == WM_KEYDOWN) L#q9_-(#  
 { ?QT"sj64w  
  if(pMsg -> wParam == VK_ESCAPE) HTyF<K  
   return TRUE; ~7WXjVZ  
  if(pMsg -> wParam == VK_RETURN) \+Ln~\Sv  
   return TRUE; ]Ja8i%LjOG  
 } e4%*I8 ^e  
 return CDialog::PreTranslateMessage(pMsg); e`M]ZG rr  
} H<7DcwXv  
Ilu`b|%D  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ruA+1-<f  
{ 13_~)V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;Jn0e:x`E  
  SaveBmp(); -7z y  
  return FALSE; *oX]=u&  
} pQ(eF0KG  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 7P^{*!  
 CMenu pop; mKQST ]5  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); fB,1s}3Hn  
 CMenu*pMenu=pop.GetSubMenu(0); W)msaq,  
 pMenu->SetDefaultItem(ID_EXITICON); ~.9o{?pbG  
 CPoint pt; G,|]a#w&v.  
 GetCursorPos(&pt); B~g05`s  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); |$?Ux,(6  
 if(id==ID_EXITICON) \(U"_NPp  
  DeleteIcon(); vcJb\LW  
 else if(id==ID_EXIT) 'EET3R K-S  
  OnCancel(); PeUd  
 return FALSE; 39aCwhh7v  
} C2=iZ`Z>T  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); rspoSPnY1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [^}>AC*im  
 AddIcon(); <*Kh=v  
 return res; t^_{5  
} \i;&@Kp.N  
u$=ogp =0  
void CCaptureDlg::AddIcon() w*xUuwi  
{ jvc?hUcLKT  
 NOTIFYICONDATA data; '}pgUh_  
 data.cbSize=sizeof(NOTIFYICONDATA); ' raB  
 CString tip; iVi3 :7*  
 tip.LoadString(IDS_ICONTIP); ^HlLj#  
 data.hIcon=GetIcon(0); %*6oUb  
 data.hWnd=GetSafeHwnd(); nB@iQxcz  
 strcpy(data.szTip,tip); $:BK{,\  
 data.uCallbackMessage=IDM_SHELL; #+Yp^6zg  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Sa?5iFg  
 data.uID=98; syW9Hlm  
 Shell_NotifyIcon(NIM_ADD,&data); DkF2R @  
 ShowWindow(SW_HIDE); `KJYm|@i  
 bTray=TRUE; {[t"O u  
} n]C%(v!u3  
=Q8H]F  
void CCaptureDlg::DeleteIcon() %6IlE.*,  
{ 7l#2,d4  
 NOTIFYICONDATA data; &QOWW}  
 data.cbSize=sizeof(NOTIFYICONDATA); $,e?X}4  
 data.hWnd=GetSafeHwnd(); )y/DGSd  
 data.uID=98; f{^M.G@  
 Shell_NotifyIcon(NIM_DELETE,&data); ?%xhe  
 ShowWindow(SW_SHOW); teOBsFy/I  
 SetForegroundWindow(); "H="Ip!s  
 ShowWindow(SW_SHOWNORMAL); x !:9c<  
 bTray=FALSE; `f 6)Q`n  
} $v'Y:  
Ue g N-n  
void CCaptureDlg::OnChange() f*T)*R_  
{ Y( $Ji12  
 RegisterHotkey(); @"{'j  
} 5h|m4)$  
gF,[u  
BOOL CCaptureDlg::RegisterHotkey() !&a;P,_Fb  
{ Z ]aK'  
 UpdateData(); -q&7J' N  
 UCHAR mask=0; "0H56#eW  
 UCHAR key=0; oWx_O-_._  
 if(m_bControl) R7B,Q(q2-  
  mask|=4; bQdSX8: !R  
 if(m_bAlt) 5Q$r@&qp  
  mask|=2; KM6N'x^z  
 if(m_bShift) ^YG7dd_  
  mask|=1; 5&?KW)6 Rz  
  key=Key_Table[m_Key.GetCurSel()]; n-hvh-ZO  
 if(bRegistered){ [<Os~bfOv  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ia^%Wg7  
  bRegistered=FALSE; 5qd_>UHp  
 } *TM;trfz  
 cMask=mask; ksu}+i,a  
 cKey=key; '6o`^u>  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); AvrL9D  
 return bRegistered; 'wz\tT^  
} o=-Vt,2{  
[*9YIjn  
  四、小结 gv#c~cX]  
. Z*j!{@c  
  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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