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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: wl{Fx+<^3  
  y(K?mtQ   
  一、实现方法 =?`5n|A*  
a2dlz@)J  
  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: 7-M$c7S  
3U&Qo nCV  
#pragma data_seg("shareddata") PMJe6*(x/  
HHOOK hHook =NULL; //钩子句柄 kO:iA0KUX  
UINT nHookCount =0; //挂接的程序数目 qAsZ,ik  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7@MGs2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;SzOa7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v hUn3|  
static int KeyCount =0; qy`95^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 # E'g{.N  
#pragma data_seg() rsP3?.E  
uf* sI  
  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。  0gBD  
_Cv({m&N  
  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: ?Uzs^rsb  
"h/{YjUS  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \ A\a=A[  
cKey,UCHAR cMask) xo0",i f8  
{ ,.` ";='o  
 BOOL bAdded=FALSE; p~h= ]o'i  
 for(int index=0;index<MAX_KEY;index++){ 4-`C !q  
  if(hCallWnd[index]==0){ =|n NC  
   hCallWnd[index]=hWnd; DT #1*&-  
   HotKey[index]=cKey; Dg]ua5jk  
   HotKeyMask[index]=cMask; W"fdK_F\  
   bAdded=TRUE; B.&ly/d  
   KeyCount++; NIDK:q dR  
   break; ,CguY/y  
  } W'\{8&:!  
 } "Hmo`EB0  
 return bAdded; ,jyNV<dI  
} 3LZ0EYVL  
//删除热键 _9E7;ew  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) h3issi+N  
{ Y%$57,Bu n  
 BOOL bRemoved=FALSE; S @\Pki+n[  
 for(int index=0;index<MAX_KEY;index++){ S%b7NK  
  if(hCallWnd[index]==hWnd){ raGov`  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ "k\W2,q[  
    hCallWnd[index]=NULL; v709#/ cR  
    HotKey[index]=0; hq/k}Y  
    HotKeyMask[index]=0; >Qc0g(w  
    bRemoved=TRUE; >?yaG=  
    KeyCount--; {4&G\2<^^  
    break; 3Juhn5&N  
   } 8 vB~1tl;  
  } yqqP7  
 } 3|%Q{U  
 return bRemoved; <tAn2e!  
} Py6c=&*  
.O'S@ %]  
yNAvXkp  
  DLL中的钩子函数如下: ,U2 /J  
IuTZ2~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0X#tt`;  
{ +o)S.a+7  
 BOOL bProcessed=FALSE; x=yBB;&  
 if(HC_ACTION==nCode) ["GC   
 { 4~4PZ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }4Lv-9s,  
   switch(wParam) y[S 5  
   {  DqrS5!C  
    case VK_MENU: ]i\D*,FfU  
     MaskBits&=~ALTBIT; ofl3G {u  
     break; 3> -/sii  
    case VK_CONTROL: o87. (  
     MaskBits&=~CTRLBIT; ^V v7u@y  
     break; ` DO`c>>K  
    case VK_SHIFT: }u5;YNmXxF  
     MaskBits&=~SHIFTBIT; I-4csw<Qy  
     break;  =w0Rq~  
    default: //judge the key and send message or\ 2)  
     break; A/%K=H?  
   } ow]S 3[07  
   for(int index=0;index<MAX_KEY;index++){ j/wG0~<kz  
    if(hCallWnd[index]==NULL) 9*RfOdnNe  
     continue; ^10*s,(uS?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) MOP %vS   
    { VR2BdfKU,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^%|{>Mz;c  
     bProcessed=TRUE; Jz 'm&mu  
    } vLJ<_&6  
   } 4vPQuk!  
  } I,QJ/sI  
  else if((lParam&0xc000ffff)==1){ //有键按下 `,tv&siSA  
   switch(wParam) . [+ObF9=  
   { Sm;&2"  
    case VK_MENU: o5mt7/5[i  
     MaskBits|=ALTBIT; S%-L!V ,  
     break; KQaw*T[Q3w  
    case VK_CONTROL: SC74r?N FA  
     MaskBits|=CTRLBIT; <a2t"rc  
     break; Erl"X}P  
    case VK_SHIFT: Duj9PV`2  
     MaskBits|=SHIFTBIT; B4pheKZ2  
     break; M' "S:  
    default: //judge the key and send message oOBN  
     break; 9yajtR  
   } "]JE]n}Ulg  
   for(int index=0;index<MAX_KEY;index++){ f8L  
    if(hCallWnd[index]==NULL) 'h%)@q)J)  
     continue; YMj z , N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) f I`6]?W  
    { 25t2tj@S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [ahD%UxO5  
     bProcessed=TRUE; V9I5/~0c  
    } Dsw(ti`@  
   } U P GS  
  } XWo:~\  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &sh %]o8  
   for(int index=0;index<MAX_KEY;index++){ tk|Ew!M:  
    if(hCallWnd[index]==NULL) L0qo/6|C  
     continue; } =?kf3k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =<y$5"|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); +IK~a9t  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \'&:6\-fw  
   } Pan^@B=Q  
  } 5.0BaVwi  
 } <QQgOaS`2  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); I?lQN$A.E  
} CA7tI >y_  
y;keOI!  
  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: 15 x~[?!  
k+ 5:fB)z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J )oa:Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i d\0yRBt  
iS&fp[Th  
  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: 3cBuqQ  
Z=|:D,&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q*{i/=~  
{ QY8I_VF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) CtTG`)"|  
 { 'M=(5p  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @C0{m7q  
  SaveBmp(); mLd=+&M  
  return FALSE;  4C/  
 } F6dm_Oq&  
 …… //其它处理及默认处理 >(ku*  
} bqJL@!T  
O _yJR  
w{#K.dx  
  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。 ]7^OTrZ N  
#[ vmS  
  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。 O(!J^J3_z  
Q!7Er  
  二、编程步骤 L)H7~.Dj  
Q1mz~r  
  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"; ;eI,1 [_  
Vl5}m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ~e@ QJ=r  
^:5 ;H=.  
  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; T;w%-k\<r  
A-aukJg9  
  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; G#ZU^%$M,  
\9geDX9A  
  5、 添加代码,编译运行程序。 $xNM^O  
SSY E&  
三、程序代码 M&Sjo' ( .  
DNcf2_m  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL d^ L` dot  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 1Y$ gt  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ +e);lS"+/  
#if _MSC_VER > 1000 rbS67--]  
#pragma once 8`Q8Mct$<  
#endif // _MSC_VER > 1000 !e*Q2H+  
#ifndef __AFXWIN_H__ 3+@p  
#error include 'stdafx.h' before including this file for PCH {1li3K&0s  
#endif Z)<ljW  
#include "resource.h" // main symbols sDTCV8"w  
class CHookApp : public CWinApp GKu@8Ol-wu  
{ xbnx*4o0  
 public: aFjcyD  
  CHookApp();  Iz*'  
  // Overrides Rx<m+=  
  // ClassWizard generated virtual function overrides xPWzm hF  
  //{{AFX_VIRTUAL(CHookApp) K??%Qh5l+C  
 public: }dX[u`zQ  
  virtual BOOL InitInstance(); +[:"$?J  
  virtual int ExitInstance(); i 2hP4<;h  
  //}}AFX_VIRTUAL PVH^yWi n  
  //{{AFX_MSG(CHookApp)  ;)s$Et%  
  // NOTE - the ClassWizard will add and remove member functions here. I:CnOpR>A  
  // DO NOT EDIT what you see in these blocks of generated code ! ? acm5dN  
  //}}AFX_MSG GGo)k1T|)  
  DECLARE_MESSAGE_MAP() 6S)$wj*w  
}; td%]l1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |b7 v(Hx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,V'+16xW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3`uv/O2~i  
BOOL InitHotkey(); S 1sNVW  
BOOL UnInit(); MlaViw  
#endif F$QN>wPpM  
23?\jw3w  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ?$i`K|  
#include "stdafx.h" z )s{>^D  
#include "hook.h" 8 z0j}xY%  
#include <windowsx.h> <@6K(  
#ifdef _DEBUG teH.e!S  
#define new DEBUG_NEW OF J49X  
#undef THIS_FILE & 9}L +/,  
static char THIS_FILE[] = __FILE__; #Jp_y|  
#endif f1w&D ]|S+  
#define MAX_KEY 100 /\34o{  
#define CTRLBIT 0x04  Aq674   
#define ALTBIT 0x02 1Q"w)Ta  
#define SHIFTBIT 0x01 KU#w %  
#pragma data_seg("shareddata") s ;EwAd(  
HHOOK hHook =NULL; x O?w8*d  
UINT nHookCount =0; @yiAi:v@  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ,rj_P  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT PDQC^2Z  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ]D_"tQ?i  
static int KeyCount =0; reseu*5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hG51jVYtw  
#pragma data_seg() "P.H  
HINSTANCE hins; I/4:SNha  
void VerifyWindow(); ?.Mw  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) uc;1{[5`1q  
//{{AFX_MSG_MAP(CHookApp) iR} 3 [  
// NOTE - the ClassWizard will add and remove mapping macros here. _RI`I}&9Z  
// DO NOT EDIT what you see in these blocks of generated code! Bh3N6j+$d  
//}}AFX_MSG_MAP &/QdG= r+  
END_MESSAGE_MAP() v"wxHro  
u&{}hv&FY  
CHookApp::CHookApp() mHCp^g4Q  
{ 6r  
 // TODO: add construction code here, Mbbgsy3W  
 // Place all significant initialization in InitInstance |dNJx<-  
} ;Z>u]uK4+  
@CGci lS=  
CHookApp theApp; <[iw1>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $Ro]]NUz|  
{ .U}"ONd9e  
 BOOL bProcessed=FALSE; u /PaXQ  
 if(HC_ACTION==nCode) @c 3GJ'"X  
 { 99 W-sV  
  if((lParam&0xc0000000)==0xc0000000){// Key up )}ygzKEa  
   switch(wParam) }/)vOUcEd  
   { 8{DZew /  
    case VK_MENU: ;QYUiR  
     MaskBits&=~ALTBIT; Iw@ou  
     break; "rxhS; R1>  
    case VK_CONTROL: +5:Dy,F =  
     MaskBits&=~CTRLBIT; >4I,9TO  
     break; DJ&ni`  
    case VK_SHIFT: |5J'`1W  
     MaskBits&=~SHIFTBIT; iYbp^iVg  
     break; b!(ew`Y;  
    default: //judge the key and send message Std?p{ i  
     break; kH;DAphk  
   } Ug :3)q[O  
   for(int index=0;index<MAX_KEY;index++){ &8=wkG%  
    if(hCallWnd[index]==NULL) RbOEXH*]  
     continue; 7kiZFHV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y $i^C:N  
    { ~yX8p7qr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p2m@0ou  
     bProcessed=TRUE; eXs^YPi  
    } j?c"BF.  
   } `.oWmBey\  
  } _xKuEU}  
  else if((lParam&0xc000ffff)==1){ //Key down ^Om0~)"q  
   switch(wParam) a7$]" T 7  
   { JAt$WW{  
    case VK_MENU: &# [w*t(A  
     MaskBits|=ALTBIT; m-xnbTcQ  
     break; xi+bBqg<.K  
    case VK_CONTROL: ,\){-H/n  
     MaskBits|=CTRLBIT; Bqcih$`BVU  
     break; 3/?^d;=  
    case VK_SHIFT: dM-qd`  
     MaskBits|=SHIFTBIT; 8-JOfq}s  
     break; %-nYK3  
    default: //judge the key and send message 3t4i2]  
     break; \*a7o GyH>  
   } A{Kc"s4fO  
   for(int index=0;index<MAX_KEY;index++) z_i (o  
   { Ym% $!#  
    if(hCallWnd[index]==NULL) Ee~<PDzB  
     continue; Ru&>8Ln0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GgU8f0I  
    { hSN{jl{L`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); )7aUDsu>4  
     bProcessed=TRUE; K'6NW:zp~  
    } =00c1v  
   } ^ gMkQYo(#  
  } *XU2%"Sc  
  if(!bProcessed){ e7_.Xr~[  
   for(int index=0;index<MAX_KEY;index++){ ]\JLlQ}#H  
    if(hCallWnd[index]==NULL) "^froQ{"T  
     continue; $q|-9B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) )X2 /_3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #NyfE|MKBC  
   } |&oTxx$S  
  } B,5kG{2!  
 } ; _K3/:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m{w'&\T  
} X7~^D[ X  
i8h^~d2"  
BOOL InitHotkey() R/WbcQ)  
{ q\$k'(k>35  
 if(hHook!=NULL){ ?Tlt(%f  
  nHookCount++; o#Viz:  
  return TRUE; -u$U~?|`  
 } E]P7u"1  
 else mB5Sm|{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); j[RY  
  if(hHook!=NULL) {y%|Io`P  
   nHookCount++; rJM/.;Ag  
  return (hHook!=NULL); `9Rj;^NJ  
} hh[@q*C  
BOOL UnInit() ?u4t;  
{ %HD0N&  
 if(nHookCount>1){ m S4N%Q  
  nHookCount--; ?Q[b1:;Lm  
  return TRUE; ( }RJW:  
 } pSl4^$2XR  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Pr_DMu  
 if(unhooked==TRUE){ KIGMWS^^  
  nHookCount=0; "!9FJ Y  
  hHook=NULL; ;U&~tpd  
 } E*vh<C  
 return unhooked; aT~=<rEDy  
} 6n:oEXM>  
H1d2WNr[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ms=N+e$n  
{ F|&%Z(@a  
 BOOL bAdded=FALSE; v:gdG|n"  
 for(int index=0;index<MAX_KEY;index++){ Sw.Kl 0M  
  if(hCallWnd[index]==0){ _&RGhA  
   hCallWnd[index]=hWnd; N5 b^  
   HotKey[index]=cKey; jSQM3+`b  
   HotKeyMask[index]=cMask; "#.L\p{Zy  
   bAdded=TRUE; tRbZX{  
   KeyCount++; F*J bTEOn  
   break; \HL66%b[  
  } 2<E@f0BVAy  
 } ()ww9L2  
 return bAdded; ZfibHivz  
} `4,]Mr1b  
o0_H(j?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z .+J\  
{ JYnyo$m/  
 BOOL bRemoved=FALSE; Jow{7@FG  
 for(int index=0;index<MAX_KEY;index++){ pQoZDD@B$  
  if(hCallWnd[index]==hWnd){ bQ-n<Lx  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l% p4.CX  
    hCallWnd[index]=NULL; -Dwe,N"{2  
    HotKey[index]=0; gNC'kCx0c  
    HotKeyMask[index]=0; *rVI[k L  
    bRemoved=TRUE; N}Or+:"O:q  
    KeyCount--; LX}|%- iv  
    break; g,B@*2Uj  
   } @QDUz>_y  
  } 69 J4p=c,  
 } (ZP e{;L.  
 return bRemoved; 0x # V   
} Ym#io]  
(!a\23  
void VerifyWindow() ZU`HaL$  
{ e 8^%}\F  
 for(int i=0;i<MAX_KEY;i++){ C't%e  
  if(hCallWnd!=NULL){ rS0#]Gg  
   if(!IsWindow(hCallWnd)){ p  ~)\!  
    hCallWnd=NULL; 212 =+k  
    HotKey=0; }OSfC~5P  
    HotKeyMask=0; u4xJ-Vu  
    KeyCount--; UMH~Q`"  
   } !lKDNQ8>["  
  } 9y*(SDF  
 } GYonb) F  
} kdMB.~(K=  
=H"%{VeC5  
BOOL CHookApp::InitInstance() ~]BR(n  
{ ]0pI6"  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); y*8;T v|  
 hins=AfxGetInstanceHandle(); =|d5V%mK  
 InitHotkey(); w$749jGx  
 return CWinApp::InitInstance(); &A^2hPe}  
} R!WeSgKCs  
{9hhfI#3_  
int CHookApp::ExitInstance() >Lz2zlZI  
{ ?hW(5]p|  
 VerifyWindow(); tOPk x(  
 UnInit(); 2Mu(GUe;  
 return CWinApp::ExitInstance(); *}LQZFrnX  
} $-)y59w"  
;e~K<vMm;y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file l`];CALA4  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7wqD_Xr  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +7K]5p;!~  
#if _MSC_VER > 1000 Y C}$O2  
#pragma once  uMBb=   
#endif // _MSC_VER > 1000 sk. rJ  
[oH,FSuO!2  
class CCaptureDlg : public CDialog z<BwV /fH}  
{ [92bGR{  
 // Construction t*Wxvoxk  
 public: b$FXRR\G  
  BOOL bTray; F,XJGD*  
  BOOL bRegistered; 9a.[>4}  
  BOOL RegisterHotkey(); BCH I@a  
  UCHAR cKey; 5gPAX $jH  
  UCHAR cMask; 4_S%K&  
  void DeleteIcon(); Zn'y"@%t[  
  void AddIcon(); P+3)YO1C  
  UINT nCount; sQT,@'"  
  void SaveBmp(); Jaf=qwZ/`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ix}*whW=U  
  // Dialog Data K9Pw10g'  
  //{{AFX_DATA(CCaptureDlg) *Xd_=@L&B  
  enum { IDD = IDD_CAPTURE_DIALOG }; O0"&wvR+5  
  CComboBox m_Key; i)e)FhEY6  
  BOOL m_bControl; O11.wLNH  
  BOOL m_bAlt; E9[8th,t  
  BOOL m_bShift; nzu 3BVv  
  CString m_Path; H %PIE1_  
  CString m_Number; Q_a%$a.rV  
  //}}AFX_DATA Eb9M;u  
  // ClassWizard generated virtual function overrides P^*gk P  
  //{{AFX_VIRTUAL(CCaptureDlg) :Ee5:S   
 public: fKT(.VN q5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /t?(IcP5  
 protected: @i:_ JOl  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support VAR/"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 6UJBE<ntj  
  //}}AFX_VIRTUAL 4HDQj]z/  
  // Implementation dzMI5fA<_  
 protected: ?|Mmz@  
  HICON m_hIcon; Py,@or7n  
  // Generated message map functions ?jzadCel  
  //{{AFX_MSG(CCaptureDlg) cl-i6[F  
  virtual BOOL OnInitDialog(); }(XvI^K[^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); UJF }Ye  
  afx_msg void OnPaint(); Web8"8eD  
  afx_msg HCURSOR OnQueryDragIcon(); !PrO~  
  virtual void OnCancel(); ]# T9v06w  
  afx_msg void OnAbout(); WJL,L[XC  
  afx_msg void OnBrowse(); r^6v o6^  
  afx_msg void OnChange(); +NEP*mk  
 //}}AFX_MSG ]j:Ikb}  
 DECLARE_MESSAGE_MAP() ByZ.!~  
}; 63- YWhs;  
#endif f:g<Bz=u)*  
Qs{Qg<}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]R{=|  
#include "stdafx.h" 2=NYBOE  
#include "Capture.h" zR3Z(^]v  
#include "CaptureDlg.h" _mL9G5~r  
#include <windowsx.h> PX'I:B]x*  
#pragma comment(lib,"hook.lib") Y<.F/iaH  
#ifdef _DEBUG _>:g&pS/  
#define new DEBUG_NEW M !OI :v  
#undef THIS_FILE _.06^5o  
static char THIS_FILE[] = __FILE__; F]?$Q'U  
#endif w } 2|Do$5  
#define IDM_SHELL WM_USER+1 7"JU)@ U]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U>x2'B v  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .]H]H*wC  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; hOMFDfhU  
class CAboutDlg : public CDialog o-Idr{  
{ .^.UJo;4G  
 public: 90aPIs-  
  CAboutDlg(); 1,`x1dcO!A  
  // Dialog Data %dT%r=%Y  
  //{{AFX_DATA(CAboutDlg) Pjb9FCA'  
  enum { IDD = IDD_ABOUTBOX }; P[nWmY  
  //}}AFX_DATA |2 wff?  
  // ClassWizard generated virtual function overrides xD?{Hw>QT#  
  //{{AFX_VIRTUAL(CAboutDlg) ,em6wIq,  
 protected: ::T<de7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support O\KAvoQ%s  
  //}}AFX_VIRTUAL v V^GIWK  
  // Implementation c[y=K)<Z  
 protected: FVQWz[N  
  //{{AFX_MSG(CAboutDlg) %#QFu/l  
  //}}AFX_MSG v,i:vT\~  
  DECLARE_MESSAGE_MAP() kdYl>M  
}; HIa$0g0J  
Em"X5>;4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) '/ &"  
{ :M[E-j;  
 //{{AFX_DATA_INIT(CAboutDlg) 0RSa{iS*A  
 //}}AFX_DATA_INIT 4!}fCP ty  
} #!D5DK@+  
<7] z'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) nG%j4r ;  
{ VD#^Xy4% r  
 CDialog::DoDataExchange(pDX); 8rpN2M 3h  
 //{{AFX_DATA_MAP(CAboutDlg) l*m|b""].u  
 //}}AFX_DATA_MAP  B-gr2-  
} }\*Sf[EMD  
( L6`_)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #*]= %-A  
 //{{AFX_MSG_MAP(CAboutDlg) `A^} X  
 // No message handlers -<O:isB   
 //}}AFX_MSG_MAP zuPH3Q={  
END_MESSAGE_MAP() KnFbRhu[  
#EM'=Q%TO  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) G<dXJ ]\\  
: CDialog(CCaptureDlg::IDD, pParent) #dfW1@m  
{ y14@9<~9  
 //{{AFX_DATA_INIT(CCaptureDlg) pq&c]8H  
  m_bControl = FALSE; _INUJc  
  m_bAlt = FALSE; t2SZ]|C  
  m_bShift = FALSE; aBC[(}Pb]  
  m_Path = _T("c:\\"); YaT07X.(b  
  m_Number = _T("0 picture captured."); ha),N<'  
  nCount=0; >PJ-Z~O'   
  bRegistered=FALSE; 5k(#kyP  
  bTray=FALSE; fIcv}Y  
 //}}AFX_DATA_INIT E0pQRGPA  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5y'Yosy:  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); -oo=IUk  
} o_N02l4J)  
(os7Q?  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O9yQ9sl  
{ *Sf^()5C,  
 CDialog::DoDataExchange(pDX); V V4_  
 //{{AFX_DATA_MAP(CCaptureDlg) k1H0hDE  
  DDX_Control(pDX, IDC_KEY, m_Key); C/Z"W@7#;  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); TatyD**(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }00e@a  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); a wK'XFk  
  DDX_Text(pDX, IDC_PATH, m_Path); G9[-|[j^N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Jr9}'l8  
 //}}AFX_DATA_MAP )AoFd>  
} T7Ac4LA  
2yZ6:U~  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "%]dC {  
//{{AFX_MSG_MAP(CCaptureDlg) w g1pt1 `  
 ON_WM_SYSCOMMAND() HlSuhbi'@  
 ON_WM_PAINT() wm8x1+P  
 ON_WM_QUERYDRAGICON() >D;hT*3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) =KZ4:d5  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Vel;t<1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _YS+{0 Vq%  
//}}AFX_MSG_MAP D.6dPzu`  
END_MESSAGE_MAP() p o`$^TB^+  
!%X`c94  
BOOL CCaptureDlg::OnInitDialog() D+3Y.r 9  
{ aVYUk7_<  
 CDialog::OnInitDialog(); ,H?p9L; qp  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); jb2:O,+!  
 ASSERT(IDM_ABOUTBOX < 0xF000); {\&"I|dpe  
 CMenu* pSysMenu = GetSystemMenu(FALSE); f)x}_dw%  
 if (pSysMenu != NULL) u3:Qt2^S  
 { ,')bO*N g  
  CString strAboutMenu; -!cAr <  
  strAboutMenu.LoadString(IDS_ABOUTBOX); b9N4Gr  
  if (!strAboutMenu.IsEmpty())  o %%fO  
  { ^!qmlx*  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0)]1)z(P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /<$"c"UQ  
  } d"UW38K{  
 } ,no:6&#  
 SetIcon(m_hIcon, TRUE); // Set big icon WL Lv a<{  
 SetIcon(m_hIcon, FALSE); // Set small icon $hQg+nY.  
 m_Key.SetCurSel(0); Snu;5:R  
 RegisterHotkey(); sJ/e=1*  
 CMenu* pMenu=GetSystemMenu(FALSE); }j1Zk4}[x  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 03o3[g?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z)>{O3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); af(JoX*U  
 return TRUE; // return TRUE unless you set the focus to a control e;5Lv9?C8  
} rk|(BA  
b2e  a0  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) =.hDf<U  
{ 1}E@lOc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) A*~1Uz\t  
 { lKUm_; m  
  CAboutDlg dlgAbout; WN#lfn8 7  
  dlgAbout.DoModal(); h.;CL#s  
 } I uj=d~|>  
 else 77d`N  
 { `Qf :PX3  
  CDialog::OnSysCommand(nID, lParam); \cP'#jZz  
 } }GDG$QI]K&  
} !nq\x8nU  
f](uc(8Z  
void CCaptureDlg::OnPaint() :5{@*  
{ }>~>5jc/Pg  
 if (IsIconic()) &2=KQ\HO  
 { d %W}w.  
  CPaintDC dc(this); // device context for painting E$Pjp oQTf  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); J*!:ar  
  // Center icon in client rectangle ;-GzGDc~0  
  int cxIcon = GetSystemMetrics(SM_CXICON); pHB35=p28  
  int cyIcon = GetSystemMetrics(SM_CYICON); y9li<u<PF  
  CRect rect; Xb-c`k~_  
  GetClientRect(&rect);  ,nR8l  
  int x = (rect.Width() - cxIcon + 1) / 2; D(6x'</>?  
  int y = (rect.Height() - cyIcon + 1) / 2; }~r6>7I  
  // Draw the icon X,+}syK  
  dc.DrawIcon(x, y, m_hIcon); j(C UYm  
 } KR(} A"  
 else /^ 3oq]  
 { :wZ`>,K"t>  
  CDialog::OnPaint(); "%Ana=cc  
 } j& iL5J;  
} 8]":[s6x  
<>i+R#u{  
HCURSOR CCaptureDlg::OnQueryDragIcon() n qLAby_  
{ -5v.1y=!L  
 return (HCURSOR) m_hIcon; mv*T=N8fC  
} kj!7|1i2  
Au} ;z6k  
void CCaptureDlg::OnCancel() ^;$a_$ |  
{ ]Y&)98  
 if(bTray) h+~df(S.  
  DeleteIcon(); _G[I2]  
  CDialog::OnCancel(); *;e@t4  
} ;c- ]bhBB  
2{B(j&{  
void CCaptureDlg::OnAbout() 5f'g 3'  
{ |8c:+8  
 CAboutDlg dlg; ,&&M|,NQ&s  
 dlg.DoModal(); N@*wi"Q  
} V<2fPDZ  
w;@25= |  
void CCaptureDlg::OnBrowse() /rxltF3  
{ ZoON5P>  
 CString str; xGEmrE<;  
 BROWSEINFO bi; <cv2-?L{  
 char name[MAX_PATH]; ~8xh0TSi  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 3V Mh)  
 bi.hwndOwner=GetSafeHwnd(); CQjZAv  
 bi.pszDisplayName=name; 4m~7 ~-h  
 bi.lpszTitle="Select folder"; 4:Xj-l^D  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; " Z2Tc)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vdT+,x`  
 if(idl==NULL) Rw}2*5#y  
  return; *e3L4 7"G  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g"]<J &  
 str.ReleaseBuffer(); }d~wDg<#  
 m_Path=str; '"w}gx  
 if(str.GetAt(str.GetLength()-1)!='\\') c@9Z&2)  
  m_Path+="\\"; x, Vh  
 UpdateData(FALSE); 4Wla&yy  
} 1Y"35)CR)  
=Esbeb7P  
void CCaptureDlg::SaveBmp() nl'J.dJe  
{ z/0yO@_D/q  
 CDC dc; }WO9!E(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); EARfbb"SG7  
 CBitmap bm; JC&6q >$  
 int Width=GetSystemMetrics(SM_CXSCREEN); i6F:C &.  
 int Height=GetSystemMetrics(SM_CYSCREEN); 1rv$?=Z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,.oa,sku  
 CDC tdc; a#Kmj 0  
 tdc.CreateCompatibleDC(&dc); S@c\|  
 CBitmap*pOld=tdc.SelectObject(&bm); x'2 ,sE  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4", )zDk  
 tdc.SelectObject(pOld); 7.$]f71z  
 BITMAP btm; 1]>$5 1Q  
 bm.GetBitmap(&btm); P#[IUXtT  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4Hml.|$  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); OgKWgvy  
 BITMAPINFOHEADER bih; <+\k&W&Y|y  
 bih.biBitCount=btm.bmBitsPixel; ~TG39*m  
 bih.biClrImportant=0; a*6wSAA )  
 bih.biClrUsed=0; R5K-KSvW  
 bih.biCompression=0; u%=bHg  
 bih.biHeight=btm.bmHeight; niYz9YX  
 bih.biPlanes=1; jy!f{dsC  
 bih.biSize=sizeof(BITMAPINFOHEADER); &gWMl`3^*!  
 bih.biSizeImage=size; @TA8^ND  
 bih.biWidth=btm.bmWidth; JN&MyA"  
 bih.biXPelsPerMeter=0; m)@Q_{=6M  
 bih.biYPelsPerMeter=0; Mr=}B6`  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K5!";V  
 static int filecount=0; KP=D! l&q  
 CString name; t&R!5^R  
 name.Format("pict%04d.bmp",filecount++); C|4 U78f{  
 name=m_Path+name; &@4.;u  
 BITMAPFILEHEADER bfh; E 4='m  
 bfh.bfReserved1=bfh.bfReserved2=0; p*pn@z  
 bfh.bfType=((WORD)('M'<< 8)|'B');  Iys6R?~  
 bfh.bfSize=54+size; HZDk <aU/!  
 bfh.bfOffBits=54; %Lp2jyv.  
 CFile bf; MUbhEau?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 5;F P.{+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); FgOUe  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pxw{  
  bf.WriteHuge(lpData,size); :3a&Pb*PL  
  bf.Close(); ;23=p=/h  
  nCount++; *|];f#^9  
 } #"Eks79s  
 GlobalFreePtr(lpData); t7|MkX1  
 if(nCount==1) OgEUq''  
  m_Number.Format("%d picture captured.",nCount); k40Ep(M}  
 else vIVw'Z(g}  
  m_Number.Format("%d pictures captured.",nCount); >oft :7p  
  UpdateData(FALSE); e=gboR  
} z}> 4,d  
u}Ei_ O<z  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) c8#T:HM|`  
{ GFd Z`i  
 if(pMsg -> message == WM_KEYDOWN) ZR/R'prW  
 { ATMc`z:5T  
  if(pMsg -> wParam == VK_ESCAPE) 6Cl+KcJH  
   return TRUE; v]WH8GI  
  if(pMsg -> wParam == VK_RETURN) 9U2Px$E  
   return TRUE; Z$!C=  
 } @+?+6sS  
 return CDialog::PreTranslateMessage(pMsg); AA))KBXq  
} >vQ6V'F  
e> ar  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <TI3@9\qXE  
{ G%2P  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _qY`KP "  
  SaveBmp(); z@!^ow)`J  
  return FALSE; =QrA0kQR  
} Rr+qg t;f5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ PqT"jOF]n  
 CMenu pop; 0fnZR$PB  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }  c{Fa&  
 CMenu*pMenu=pop.GetSubMenu(0); "0|BoG  
 pMenu->SetDefaultItem(ID_EXITICON); m9#}X_&x  
 CPoint pt; X,>(Y8  
 GetCursorPos(&pt); U:qF/%w  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *Jb_=j*)  
 if(id==ID_EXITICON) |.j^G2x  
  DeleteIcon(); b\1+kB/8  
 else if(id==ID_EXIT) OYBotk]{1  
  OnCancel(); d4ic9u*D  
 return FALSE; (JevHdI*V  
} +->\79<#V(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Dp!;7e s|  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]|,vCKju  
 AddIcon(); iH[E= 6*  
 return res; +yth_9  
} Ru)(dvk}S  
e@[9C(5E"  
void CCaptureDlg::AddIcon() >RM 0=bO  
{ [/?c@N,  
 NOTIFYICONDATA data; w3<Z?lj:  
 data.cbSize=sizeof(NOTIFYICONDATA); EtGH\?d~]  
 CString tip; ?Rlgv5P!  
 tip.LoadString(IDS_ICONTIP); Y.E?;iS  
 data.hIcon=GetIcon(0); R @"`~#$$  
 data.hWnd=GetSafeHwnd(); >[K0=nA  
 strcpy(data.szTip,tip); mDZ=Due1  
 data.uCallbackMessage=IDM_SHELL; {U(Bfe^a,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; w]n 4KR4  
 data.uID=98; .SG0}8gW  
 Shell_NotifyIcon(NIM_ADD,&data); 9^oo-,Su_  
 ShowWindow(SW_HIDE); y0;,dv]  
 bTray=TRUE; 8, =G1c  
} 9QX4R<"wUg  
l#Yx TY  
void CCaptureDlg::DeleteIcon() 7k>zuzRyF  
{ Q5g,7ac8L  
 NOTIFYICONDATA data; bpGzTU  
 data.cbSize=sizeof(NOTIFYICONDATA); CP +4k.)*O  
 data.hWnd=GetSafeHwnd(); Wt(Kd5k0'2  
 data.uID=98; ?;Un#6b  
 Shell_NotifyIcon(NIM_DELETE,&data); =Qyqfy*@D?  
 ShowWindow(SW_SHOW); R3$@N  
 SetForegroundWindow(); .Nc_n5D6  
 ShowWindow(SW_SHOWNORMAL); Pow|:Lau!  
 bTray=FALSE; ,`<]>;s  
} Bgf=\7;5  
TNx_Rc}  
void CCaptureDlg::OnChange() \F[n`C"Is  
{ ?k"0w)8  
 RegisterHotkey(); T\jAk+$Jo  
} mIRAS"Q!m  
C}9Kx }q  
BOOL CCaptureDlg::RegisterHotkey() .U<F6I:<md  
{ C]/&vh7ta  
 UpdateData(); FK6K6wU52m  
 UCHAR mask=0; Z^<Sj5}6  
 UCHAR key=0; rmoJ =.'  
 if(m_bControl) #7+]%;h  
  mask|=4; I:nI6gF  
 if(m_bAlt) WI6(#8^p  
  mask|=2; !Pw$48cg  
 if(m_bShift) q=njKC  
  mask|=1; ;:U<ce=  
  key=Key_Table[m_Key.GetCurSel()]; )PwQ^||{  
 if(bRegistered){ Gp,'kw"I  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); :v_w!+,/  
  bRegistered=FALSE; (oF-O{  
 } oQ{cSThj  
 cMask=mask; o'96ON0  
 cKey=key; b9y)wBC%`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); G,B?&gFX  
 return bRegistered; 5.dl>,  
} KhrFg1|  
*(icR  
  四、小结 Z&A0hI4d  
TQ?#PRB  
  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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