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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: +/ U6p!  
  / LC!|-1E  
  一、实现方法 wA< Fw )  
BTnrgs#[  
  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: $N/"c$50,  
3)*Twqt  
#pragma data_seg("shareddata") ,V &RpKek  
HHOOK hHook =NULL; //钩子句柄 v43FU3  
UINT nHookCount =0; //挂接的程序数目 W[B;;"ro  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 y^}00Z+l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 mO^ )k  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey I><sK-3  
static int KeyCount =0; Qm@v}pD  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 \1nj=ca?  
#pragma data_seg() (5h+b_eB  
l*-$H$  
  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。 Jty/gjK+  
^kh@AgG^  
  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: zlhI\jRdc  
p<8Ga.kiN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3?r?)$Jk  
cKey,UCHAR cMask) m\eYm;R Vj  
{ ~8tb^  
 BOOL bAdded=FALSE; |PutTcjQ  
 for(int index=0;index<MAX_KEY;index++){ ~JX+4~qT  
  if(hCallWnd[index]==0){ cz;gz4d8  
   hCallWnd[index]=hWnd; I?X!v6  
   HotKey[index]=cKey; + 0 |d2_]E  
   HotKeyMask[index]=cMask; a&C}' e"  
   bAdded=TRUE; &O\$=&, h  
   KeyCount++; Al^h^ 9tJ  
   break; h e1=  
  } vv^(c w>A  
 } 8/T,.<5  
 return bAdded; C@OY)!x!  
} ^"{txd?6  
//删除热键 j-(k`w\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :d} @Z}2sD  
{ ;t5e]  
 BOOL bRemoved=FALSE; |m>{< :  
 for(int index=0;index<MAX_KEY;index++){ 0u=FlQ }h  
  if(hCallWnd[index]==hWnd){ k|; [)gE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ uoMDf{d  
    hCallWnd[index]=NULL; [`U9  
    HotKey[index]=0; ;S}_/'  
    HotKeyMask[index]=0; f[+N=vr  
    bRemoved=TRUE; Q}|QgN  
    KeyCount--; IgNL1KRD  
    break; dFzlcKFFD  
   } aP`V  
  } A[Pz&\@  
 } !_pryNcb  
 return bRemoved; V)3S.*]  
} +^<-;/FZue  
+ieRpVg  
M2rgB%W)m  
  DLL中的钩子函数如下: vI0::ah/  
Y~g*"J5j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >Ni<itze$i  
{ g/BlTi  
 BOOL bProcessed=FALSE; _28vf Bl?  
 if(HC_ACTION==nCode) C,G$C7$%  
 { -Ou@T#h"  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 zOT(>1'  
   switch(wParam) u 4$$0 `  
   {  3-U@==:T  
    case VK_MENU: sHf.xc  
     MaskBits&=~ALTBIT; e!p?~70  
     break; HK4 *+  
    case VK_CONTROL: 0})mCVBY  
     MaskBits&=~CTRLBIT; X.FFBKjf[e  
     break; Y4,LXuQ  
    case VK_SHIFT: CSNfLGA  
     MaskBits&=~SHIFTBIT; kdp- |9  
     break; +kZW:t!-  
    default: //judge the key and send message xAJuIR1Hi  
     break; #7"*Pxb#A  
   } 65AG# O5R  
   for(int index=0;index<MAX_KEY;index++){ D9-D%R,  
    if(hCallWnd[index]==NULL) 4 t< mX  
     continue; rh$q]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +5oK91o[y  
    { AA~6r[*~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); xZ(f_Oy  
     bProcessed=TRUE; B<6Ye9zuG  
    } \zv?r :1t  
   } d!#qBn$*[  
  } _H)>U[  
  else if((lParam&0xc000ffff)==1){ //有键按下 4@1C$|k  
   switch(wParam) QTbv3#  
   { 9,>u,  
    case VK_MENU: q<>aZ|r  
     MaskBits|=ALTBIT; h+d3JM  
     break; WJF#+)P:Y  
    case VK_CONTROL: k+`e0Jago  
     MaskBits|=CTRLBIT; &M2SqeR62;  
     break; L6f$ID:  
    case VK_SHIFT: HZEDr}RN  
     MaskBits|=SHIFTBIT; ?h7(,39^>  
     break; `&!J6)OJ  
    default: //judge the key and send message &0*IN nlc?  
     break; BZ"+ ND9m_  
   } x/^,{RrPk  
   for(int index=0;index<MAX_KEY;index++){ 61=D&lb  
    if(hCallWnd[index]==NULL) -1<*mbb0  
     continue; /G& %T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J={R@}u  
    { iw?*Wp25  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3lT>C'qq  
     bProcessed=TRUE; XXA1%Lw%  
    } iR6w)  
   } cgF?[Z+x  
  } oRQJ YH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地  b@m\ca  
   for(int index=0;index<MAX_KEY;index++){ -3T~+  
    if(hCallWnd[index]==NULL) t8\XO j  
     continue; U6 $)e.FO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) U3 y-cgE  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^L +@oS  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 5V"g,]'Nd  
   } 8e*1L:oB!  
  } h4lrt  
 } ZA Xw=O5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V Mb r@9  
} 'v:%} qMv  
9e>Dqlv  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: LJ+Qe%|  
mOE%:xq9-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F3pBk)>a\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ">hOD'PG  
b%"Lwqdr7  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: b$k|D)_|  
Cp[ NVmN  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) bL"!z"NA  
{ Kb5 YA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) [6{o13mCWE  
 { %YbcI|i]<0  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 RJO40&Z<Z  
  SaveBmp(); +?[,{WtV  
  return FALSE; fBRU4q=^T  
 } dyN Kok#  
 …… //其它处理及默认处理 ?O.1HEr  
} NQ"`F,T  
bUBQ  
#CYDh8X<i  
  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。 d]<S/D'i  
LCf)b>C*  
  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。 NsY D~n  
8fX<,*#I  
  二、编程步骤 h(1o!$EU2  
v(vJ[_&%  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; !=yNj6_f  
/n&Y6@W  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; % XS2 ;V  
=%+O.  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; ()+PP}:$A  
?N/6m  
  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; b w2KD7  
`7mRUDz  
  5、 添加代码,编译运行程序。 k}h\RCy%f  
g&oAa;~o  
三、程序代码 y+g01z  
:\<D q 71  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r#;GVJR6  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) H@%Y"iIUP  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ W{z{AxS  
#if _MSC_VER > 1000 4IH,:w=ofN  
#pragma once t/`~(0F  
#endif // _MSC_VER > 1000 H:jx_  
#ifndef __AFXWIN_H__ j|/4V  
#error include 'stdafx.h' before including this file for PCH a/v!W@Zz}  
#endif X:1&Pdi  
#include "resource.h" // main symbols 5B76D12  
class CHookApp : public CWinApp C~:@ETcbil  
{ JX!@j3  
 public: &3t[p=  
  CHookApp(); 3j2#'Jf|:  
  // Overrides $VRVM Y [q  
  // ClassWizard generated virtual function overrides WXzSf.8p|  
  //{{AFX_VIRTUAL(CHookApp) dW`!/OaQD  
 public: |>U:Pb(  
  virtual BOOL InitInstance(); 0`D` Je<t  
  virtual int ExitInstance(); 01^+HEbm  
  //}}AFX_VIRTUAL swGp{wJ  
  //{{AFX_MSG(CHookApp) ~?#B(t  
  // NOTE - the ClassWizard will add and remove member functions here. 2MQ XtK  
  // DO NOT EDIT what you see in these blocks of generated code ! bxrT[]  
  //}}AFX_MSG N(W;\>P  
  DECLARE_MESSAGE_MAP() +t hkx$o  
}; 1q7Y,whp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !i{9wI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Zl4X,9Wt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |0Y: /uL#)  
BOOL InitHotkey(); ZJ Ke}F`l  
BOOL UnInit(); N ">4I)  
#endif l1?$quM^V  
`{GI^kgJ9  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^KRe(  
#include "stdafx.h" *@1(!A  
#include "hook.h" V@C8HTg  
#include <windowsx.h> .nG14i7C  
#ifdef _DEBUG 6J""gyK.  
#define new DEBUG_NEW v%2@M  
#undef THIS_FILE + <4gJoI  
static char THIS_FILE[] = __FILE__; AIU=56+I\  
#endif :kb2v1{\  
#define MAX_KEY 100 xxS>O%  
#define CTRLBIT 0x04 Pn|;VCh  
#define ALTBIT 0x02 EpsjaOmAF  
#define SHIFTBIT 0x01 ,^K}_z\9f  
#pragma data_seg("shareddata") "AcC\iq  
HHOOK hHook =NULL; suF<VJ)&s  
UINT nHookCount =0; 3<%ci&B  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ^_rBEyz@  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT I)YUGA5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey j'QPJ(`~1l  
static int KeyCount =0; mN&B|KWU  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K275{ydN  
#pragma data_seg() \a7caT{  
HINSTANCE hins; B}U:c]  
void VerifyWindow(); P1u(0t  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) : FN-.1C  
//{{AFX_MSG_MAP(CHookApp) !CGpE=V  
// NOTE - the ClassWizard will add and remove mapping macros here. Z&![W@m@0N  
// DO NOT EDIT what you see in these blocks of generated code! A6Vb'Gqv{  
//}}AFX_MSG_MAP \)'5V!B|s  
END_MESSAGE_MAP() FMNT0  
oH ] _2[ !  
CHookApp::CHookApp() L#6!W  
{ ^1mnw@04  
 // TODO: add construction code here, CAT{)*xc  
 // Place all significant initialization in InitInstance 5"WI^"6b:  
} N7 ox#=g  
hC D6  
CHookApp theApp; Svl; Ul  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =73aME}  
{ h; "pAE  
 BOOL bProcessed=FALSE; Hq;*T3E  
 if(HC_ACTION==nCode) UrRYK-g  
 { q*'-G]tH=  
  if((lParam&0xc0000000)==0xc0000000){// Key up \~BYY|UB;W  
   switch(wParam) 8W"Xdv{  
   { \WPy9kRU  
    case VK_MENU: gCL?{oVU  
     MaskBits&=~ALTBIT; `37%|e3bQ  
     break; B{ hV|2  
    case VK_CONTROL: ]VcuD05"C  
     MaskBits&=~CTRLBIT; l&Cy K#B:\  
     break; N eC]MW  
    case VK_SHIFT: 9@^N* E+  
     MaskBits&=~SHIFTBIT; =_=0l+\}  
     break; {\u6Cjx  
    default: //judge the key and send message X@pcL{T!  
     break; i[4t`v'Dk  
   } @=NTr  
   for(int index=0;index<MAX_KEY;index++){ K 3.z>.F'h  
    if(hCallWnd[index]==NULL) k@ So l6  
     continue; C-sFTf7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~o X`Gih  
    { [R(dCq>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); dh-?_|"  
     bProcessed=TRUE; lKBI3oYn  
    } q5G`N>"V  
   } Y1-=H)G  
  } 3S=$ng  
  else if((lParam&0xc000ffff)==1){ //Key down W!R7D%nX  
   switch(wParam) 's\rQ-TV  
   { %% +@s   
    case VK_MENU: h )% e  
     MaskBits|=ALTBIT; -_^#7]  
     break; Y;1s=B9  
    case VK_CONTROL: ys- w0H  
     MaskBits|=CTRLBIT; ">v- CSHY  
     break; o\N^Uu  
    case VK_SHIFT: E4N"|u|   
     MaskBits|=SHIFTBIT; SNrX(V::z  
     break; gHox>r6.A  
    default: //judge the key and send message cXIuGvE&=  
     break; ,X)/ T!ff  
   } E^C [G)7n  
   for(int index=0;index<MAX_KEY;index++) ?W\KIp \Kn  
   { 5 D[`nU}  
    if(hCallWnd[index]==NULL) ?6V U4nK/*  
     continue; /}Ct2w&<k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q;k D Jo  
    { !N74y%=M  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #SR )tU  
     bProcessed=TRUE; 8E|FFHNK<2  
    } Bp/ k{7  
   } bo &QKK  
  } 4hWFgk  
  if(!bProcessed){ TUX:[1~Nf[  
   for(int index=0;index<MAX_KEY;index++){ q22@ZRw  
    if(hCallWnd[index]==NULL) ekCt1^5Y  
     continue; &\W5|*`x-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YDaGr6y4i  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :a*F>S!  
   } LM*m> n*  
  } F#Bi*YY  
 } +a|u,'u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 7,3 g{8  
} A",Xn/d  
F$HL \y  
BOOL InitHotkey() GXwQ )P5]  
{ yPk s,7U  
 if(hHook!=NULL){ 1>)uI@?Rb  
  nHookCount++; Q(BM0n)f  
  return TRUE; $%z M Z  
 } DcsQ6  
 else ',s{N9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 6)1xjE#  
  if(hHook!=NULL) LDbo=w  
   nHookCount++; -c p)aH)  
  return (hHook!=NULL); yJ2A!id  
} ,ik\MSS  
BOOL UnInit() )AXa.y  
{ 2$O6%0  
 if(nHookCount>1){ BFPy~5W  
  nHookCount--; Wl{wY,u  
  return TRUE; S~\u]j^%y  
 } QuBaG<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); DIWcX<s  
 if(unhooked==TRUE){ kYu"`_n}  
  nHookCount=0; mU;\,96#  
  hHook=NULL; E@8&#<  
 } $*;ke5Dm4  
 return unhooked; _))--+cL  
} kjRL|qx`a;  
*W<|5<<u@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p}lFV,V  
{ \SA$:^zO  
 BOOL bAdded=FALSE; ,,~|o3cfq  
 for(int index=0;index<MAX_KEY;index++){ Zrp9`~_g<!  
  if(hCallWnd[index]==0){ E|ZLz~  
   hCallWnd[index]=hWnd; +f\r?8s  
   HotKey[index]=cKey; j12khp?  
   HotKeyMask[index]=cMask; Wa'm]J  
   bAdded=TRUE; r~sQdf  
   KeyCount++; '+iqbcUd,  
   break; qdwjg8fo4Z  
  } cB4p.iO   
 } w6 .J&O  
 return bAdded; 29k\}m7l<*  
} JDm7iJxc_  
UP@-@syGw  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F}4jm,w  
{ Y -G;;~  
 BOOL bRemoved=FALSE; K2ry@haN  
 for(int index=0;index<MAX_KEY;index++){ ZJ}|t  
  if(hCallWnd[index]==hWnd){ sRSy++FRF  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ T0lbMp  
    hCallWnd[index]=NULL; Z$ 6yB  
    HotKey[index]=0; H:`[$ ^  
    HotKeyMask[index]=0; h7[PU^m  
    bRemoved=TRUE; K*oWcsu  
    KeyCount--; &+7G|4!y  
    break; J@Qw6J  
   } psAdYEGk!  
  } yWZ%|K~$  
 } qb$f,E[  
 return bRemoved; j~`rc2n%  
} k?ksv+e\  
KHt.g`1:R  
void VerifyWindow() `+EjmY  
{ pYaq1_<+  
 for(int i=0;i<MAX_KEY;i++){ YJ~3eZQ  
  if(hCallWnd!=NULL){ qJLtqv  
   if(!IsWindow(hCallWnd)){ 5Y(f7,JX  
    hCallWnd=NULL; qY%{c-aMA  
    HotKey=0; TkV*^j5  
    HotKeyMask=0; .RxAYf|  
    KeyCount--; VD-2{em  
   } ($Y6hn+  
  } VH5Vg We  
 } Dv[ 35[Yh  
} l} UOg   
K;#9: Z^+  
BOOL CHookApp::InitInstance()  XV*uu "F  
{ tS&rR0<OW  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); d=8q/]_p  
 hins=AfxGetInstanceHandle(); u7kw/_f  
 InitHotkey(); oN " /w~  
 return CWinApp::InitInstance(); tQrkRg(E:  
} xbhU:,o  
Oa|'wh ug  
int CHookApp::ExitInstance() VJ$UpqVm  
{ Ee-yP[2 *  
 VerifyWindow(); '}$$o1R  
 UnInit(); -%t2_g,  
 return CWinApp::ExitInstance(); xk$U+8K  
} cG~-OHU  
A?/(W_Gt^M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 1VC:o]$  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) G!3d!$t  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #jNN?,ZK  
#if _MSC_VER > 1000 iLD:}yK  
#pragma once &ZUV=q%g9n  
#endif // _MSC_VER > 1000 & !I$  
5rx;?yvn  
class CCaptureDlg : public CDialog XB'PEvh8  
{ +$H`/^a.  
 // Construction J)leRR&  
 public: )Y}8)/Pud  
  BOOL bTray; GV T[)jS  
  BOOL bRegistered; 7;;HP`vY  
  BOOL RegisterHotkey(); {@w!kl~8  
  UCHAR cKey; G@Y!*ZH*f  
  UCHAR cMask; _}(ej&'f  
  void DeleteIcon(); ^E(:nxQ6s  
  void AddIcon();  dr iw\  
  UINT nCount; P85@G 2  
  void SaveBmp(); BNe6q[ )W~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {*J{1)2  
  // Dialog Data X,"(G}KUA  
  //{{AFX_DATA(CCaptureDlg) 0xQ="aXE  
  enum { IDD = IDD_CAPTURE_DIALOG }; I@<\DltPi  
  CComboBox m_Key; Z&E!m   
  BOOL m_bControl; .#[==  
  BOOL m_bAlt; bI"_hvcFp  
  BOOL m_bShift; \tx4bV#  
  CString m_Path; 3/q) %Z^=  
  CString m_Number; QBI;aG<+b>  
  //}}AFX_DATA ,aBo p#  
  // ClassWizard generated virtual function overrides >=Pn\" j  
  //{{AFX_VIRTUAL(CCaptureDlg) :v>Nz7SB  
 public: z<c%Xl\$%  
  virtual BOOL PreTranslateMessage(MSG* pMsg); .V Cfh+*J#  
 protected: ^yo~C3 r~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >MeM  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); n6Qsug$z  
  //}}AFX_VIRTUAL #[C=LGi  
  // Implementation ckTk2xPQ  
 protected: 1SGLA"r  
  HICON m_hIcon; x<es1A'u6  
  // Generated message map functions F+3}Gkn  
  //{{AFX_MSG(CCaptureDlg) Lradyo44u\  
  virtual BOOL OnInitDialog(); |kXx9vGq@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c/Ykk7T9--  
  afx_msg void OnPaint(); 2)zAX"#/  
  afx_msg HCURSOR OnQueryDragIcon(); bYKe5y=  
  virtual void OnCancel(); n$oHr  
  afx_msg void OnAbout(); 9Oe~e  
  afx_msg void OnBrowse(); %!X|X,b^O  
  afx_msg void OnChange(); U'(@?]2 <G  
 //}}AFX_MSG "$Mz>]3&q  
 DECLARE_MESSAGE_MAP() jJK`+J,i}X  
}; iYk4=l  
#endif ,s9gGCA  
A3 |hFk  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :_f5(N*{5o  
#include "stdafx.h" .h7`Q{  
#include "Capture.h" Z/f%$~Ch  
#include "CaptureDlg.h" <+mYC'p  
#include <windowsx.h> _sGmkJi]  
#pragma comment(lib,"hook.lib") W1T% Q88  
#ifdef _DEBUG e(~9JP9  
#define new DEBUG_NEW 7(S66  
#undef THIS_FILE :K)7_]y  
static char THIS_FILE[] = __FILE__; \_w>I_=F  
#endif 34gC[G=  
#define IDM_SHELL WM_USER+1 /Qnq,`z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GWvw<`4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0mMoDJRy  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; G)G 257K"~  
class CAboutDlg : public CDialog j @HOU~x  
{ tvlrUp  
 public: [ u.r]\[J  
  CAboutDlg(); x [_SNX"  
  // Dialog Data O ;dtz\  
  //{{AFX_DATA(CAboutDlg) 'fIoN%  
  enum { IDD = IDD_ABOUTBOX }; 'C2X9/!,  
  //}}AFX_DATA s9)U",  
  // ClassWizard generated virtual function overrides OD O'!T-  
  //{{AFX_VIRTUAL(CAboutDlg) O8Dav^\y?  
 protected: p-Jp/*R5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9z$fDs}.q  
  //}}AFX_VIRTUAL Sr#\5UDS  
  // Implementation s1GR!*z>  
 protected: N a $eeM  
  //{{AFX_MSG(CAboutDlg) !JGe .U5  
  //}}AFX_MSG DQ*T2*L  
  DECLARE_MESSAGE_MAP() .;$Ub[  
}; kR,ry:J-  
rd:WF(]  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^kO+NH40  
{ F!_8?=|  
 //{{AFX_DATA_INIT(CAboutDlg) ``?79MJ5  
 //}}AFX_DATA_INIT Nm7YH@x*o  
} Z)^1~!w0  
@?vC4+'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) PptVneujI  
{ R9z:K_d,  
 CDialog::DoDataExchange(pDX); 6Lb(oY}\3  
 //{{AFX_DATA_MAP(CAboutDlg) 9Gc4mwu  
 //}}AFX_DATA_MAP ~9[O'  
} Ht9QINo  
*t%Z'IA  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) =f/CBYNw@V  
 //{{AFX_MSG_MAP(CAboutDlg) 2t[P-on  
 // No message handlers A+w'quXn  
 //}}AFX_MSG_MAP }B e;YIhG  
END_MESSAGE_MAP() Mm)yabP  
!y\r.fm!A  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) L}a-c(G+8  
: CDialog(CCaptureDlg::IDD, pParent) &pzf*|}  
{ mfqnRPZ  
 //{{AFX_DATA_INIT(CCaptureDlg) $-MVsa9>I  
  m_bControl = FALSE; BICG@  
  m_bAlt = FALSE; .mbqsb]&Y  
  m_bShift = FALSE; ~jR4%VF  
  m_Path = _T("c:\\"); qipV'T,S  
  m_Number = _T("0 picture captured."); 2rV]n  
  nCount=0; OAauD$Hh  
  bRegistered=FALSE; \_]X+o;  
  bTray=FALSE; bQ3txuha  
 //}}AFX_DATA_INIT DYDeb i6  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 F1)5"7f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,r8#-~A6,A  
} r@a]fTf  
YO'aX  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) bEKhU\@=J  
{ %b[>eIJU#  
 CDialog::DoDataExchange(pDX); 2{Y~jYt{h  
 //{{AFX_DATA_MAP(CCaptureDlg) z?^oy.  
  DDX_Control(pDX, IDC_KEY, m_Key); re~T,PPM  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ZfMs6`Wv 1  
  DDX_Check(pDX, IDC_ALT, m_bAlt); KTq+JT u  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); k5%W8dI  
  DDX_Text(pDX, IDC_PATH, m_Path); B[,AR"#b  
  DDX_Text(pDX, IDC_NUMBER, m_Number); BPuum  
 //}}AFX_DATA_MAP \i'Z(1  
} M>_vsI^I'  
k-Yli21-/|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 'eo/"~/*w  
//{{AFX_MSG_MAP(CCaptureDlg) ; ,}Dh/&E  
 ON_WM_SYSCOMMAND() CkV5PU  
 ON_WM_PAINT() Qhq' %LR  
 ON_WM_QUERYDRAGICON() 3_ly"\I\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) "ze-Mb  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) } J[Z)u  
 ON_BN_CLICKED(ID_CHANGE, OnChange) PU,%Y_xR  
//}}AFX_MSG_MAP UCt}\IJ  
END_MESSAGE_MAP() /go|r '  
6CCm1F{`  
BOOL CCaptureDlg::OnInitDialog() AP1&TQ,&  
{ %s! |,Cu  
 CDialog::OnInitDialog(); H76iBJ66  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); lrAhdi  
 ASSERT(IDM_ABOUTBOX < 0xF000); ^) (-7H  
 CMenu* pSysMenu = GetSystemMenu(FALSE); |h?2~D!+d  
 if (pSysMenu != NULL) Fw S>V2R  
 { ]"&](e6*  
  CString strAboutMenu; s&hr$`V4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); vc :%  
  if (!strAboutMenu.IsEmpty()) [j}JCmWY   
  { >%ovL8F  
   pSysMenu->AppendMenu(MF_SEPARATOR); q;}iW:r&Q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); wFX9F3m  
  } XEnu0 gr  
 } Sx[ eX,q  
 SetIcon(m_hIcon, TRUE); // Set big icon EV?U !O  
 SetIcon(m_hIcon, FALSE); // Set small icon :KgH7s}  
 m_Key.SetCurSel(0); sH.=Faos  
 RegisterHotkey(); S=0DQ19  
 CMenu* pMenu=GetSystemMenu(FALSE); m<49<O6o  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >.6|\{*sG  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {zWR)o .=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $&=xw _  
 return TRUE; // return TRUE unless you set the focus to a control 5f{P% x(  
} {#ynN`tLyF  
%@Z;;5L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) >MGWN  
{ c} +*$DeT  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *5 +GJWKN  
 { 3 3|t5Ia  
  CAboutDlg dlgAbout; {"+M%%`*#  
  dlgAbout.DoModal(); PJcfiRa'jQ  
 } s-_D,$ |  
 else BY.k.]/  
 { V ^+p:nP  
  CDialog::OnSysCommand(nID, lParam); J*[@M*R;&  
 } 4Wp5[(bg  
} r=&,2meo  
qXg&E}]:=  
void CCaptureDlg::OnPaint() 'S1u@p,q  
{ G[\TbPh  
 if (IsIconic()) #]x3(}3W  
 { VJ=>2'I  
  CPaintDC dc(this); // device context for painting Km;}xke6  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 00.x*v  
  // Center icon in client rectangle JwB'B  
  int cxIcon = GetSystemMetrics(SM_CXICON); At"$Cu!k  
  int cyIcon = GetSystemMetrics(SM_CYICON); HT6 [Z1  
  CRect rect; 6q\*{_CPB  
  GetClientRect(&rect); 8f/KNh7#s  
  int x = (rect.Width() - cxIcon + 1) / 2; z 7ik/>d?  
  int y = (rect.Height() - cyIcon + 1) / 2; _Z Sp$>)/  
  // Draw the icon Bl*}*SPU  
  dc.DrawIcon(x, y, m_hIcon); J\r\_P@;c  
 } ]bJz-6u#:  
 else QJ3#~GYNr  
 { oX;.v9a  
  CDialog::OnPaint(); N^dQX,j  
 } HJ]xZ83pC  
} | L8 [+_m  
V2ih/mh   
HCURSOR CCaptureDlg::OnQueryDragIcon() Xva(R<W7d<  
{ bAPMD  
 return (HCURSOR) m_hIcon; G;3%k.{  
} 7-``J#9=  
4 kjfYf@A  
void CCaptureDlg::OnCancel() 1>OlBp  
{ E=N$JM  
 if(bTray) @QQ%09*  
  DeleteIcon(); V9,<>  
  CDialog::OnCancel(); &h0LWPl  
} b)<WC$"  
3)y1q>CQf  
void CCaptureDlg::OnAbout() 9h amxi  
{ q1T)H2S  
 CAboutDlg dlg; ->rqr#  
 dlg.DoModal(); {+WBi(=W  
}  xgcxA:  
Cgx:6TRS  
void CCaptureDlg::OnBrowse() b^VRpv  
{ nwU],{(Hgr  
 CString str; |Dn Zk3M,  
 BROWSEINFO bi; ZC N}iQu4  
 char name[MAX_PATH]; ]~aj  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 1ysfpX{=  
 bi.hwndOwner=GetSafeHwnd(); -Cs( 3[  
 bi.pszDisplayName=name; nzC *mPX8  
 bi.lpszTitle="Select folder"; %):_  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; cuN9R G  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z*m^K%qJ  
 if(idl==NULL) YGJ!!(~r  
  return; Hu"$ )V  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 509T?\r  
 str.ReleaseBuffer(); (oG YnN,2  
 m_Path=str; }PBme'kP  
 if(str.GetAt(str.GetLength()-1)!='\\') ENZym  
  m_Path+="\\"; c!ZZMC s  
 UpdateData(FALSE); k( :Bl  
} 6G2~'zqPc~  
E`o_R=%  
void CCaptureDlg::SaveBmp() /_0B5 ,6R  
{ iT}>a30]B  
 CDC dc; R iLl\S#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "E\vdhk  
 CBitmap bm; ,~Mf2Y#m0p  
 int Width=GetSystemMetrics(SM_CXSCREEN); itYoR-XJ  
 int Height=GetSystemMetrics(SM_CYSCREEN); Voo'ZeZa  
 bm.CreateCompatibleBitmap(&dc,Width,Height); nQ\`]_C  
 CDC tdc; E7L>5z  
 tdc.CreateCompatibleDC(&dc); ^2~ZOP$A  
 CBitmap*pOld=tdc.SelectObject(&bm); p AOKy  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); YB"gLv?  
 tdc.SelectObject(pOld); TcaW'&(K  
 BITMAP btm; V vrsf6l]  
 bm.GetBitmap(&btm); ,`bW (V  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; },8|9z#pyB  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); NftnbsTmy  
 BITMAPINFOHEADER bih; "z{/*uM2<  
 bih.biBitCount=btm.bmBitsPixel; @P7'MiP]K  
 bih.biClrImportant=0; (%X *b.n=  
 bih.biClrUsed=0; I _KHQ&Z*  
 bih.biCompression=0; FBXktSg  
 bih.biHeight=btm.bmHeight; )/jDt dI  
 bih.biPlanes=1; gy}3ZA*F  
 bih.biSize=sizeof(BITMAPINFOHEADER); cy8>M))c  
 bih.biSizeImage=size; dHDtY$/_  
 bih.biWidth=btm.bmWidth; 3gUY13C}:p  
 bih.biXPelsPerMeter=0; V *@q< rQ  
 bih.biYPelsPerMeter=0; 9i\RdJv.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6\.g,>   
 static int filecount=0; kH eD(Ea  
 CString name; j2D!=PK;  
 name.Format("pict%04d.bmp",filecount++); f6Y?),`  
 name=m_Path+name; sE?%;uBb  
 BITMAPFILEHEADER bfh; #&'S-XE+  
 bfh.bfReserved1=bfh.bfReserved2=0; tg\Nm7I  
 bfh.bfType=((WORD)('M'<< 8)|'B'); %unn{92)  
 bfh.bfSize=54+size; lwQ!sH[M  
 bfh.bfOffBits=54; zDdo RK@  
 CFile bf; B~I ]3f  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ E{T3Xwg  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nX!%9x$3  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); hl:Ba2_E +  
  bf.WriteHuge(lpData,size); 4mDHAR%D  
  bf.Close(); `j{3|C=  
  nCount++; ~EBaVl ({  
 } 2H`r:x<Z-  
 GlobalFreePtr(lpData); (2;Aqx5i  
 if(nCount==1) PB^rniYh  
  m_Number.Format("%d picture captured.",nCount); w5i*pOG)Z  
 else X"TL'"?fo  
  m_Number.Format("%d pictures captured.",nCount); K6->{!8]k  
  UpdateData(FALSE); ]V/5<O1  
} q]="ek&_  
E:9RskI  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DghyE`  
{ wrkw,H  
 if(pMsg -> message == WM_KEYDOWN) 'l/l]26rO4  
 { (csk   
  if(pMsg -> wParam == VK_ESCAPE) gveGBi  
   return TRUE; |B (,53  
  if(pMsg -> wParam == VK_RETURN) 791v>h    
   return TRUE; Q,.dIPla  
 } @wXYza0|d  
 return CDialog::PreTranslateMessage(pMsg); ":eyf 3M  
} NN7KwVg  
- k0a((?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D\G 8p;  
{ =_OJ 7K'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ r3Ol?p  
  SaveBmp(); YHN6/k7H  
  return FALSE; f4S}Nga(  
} !\'w>y7  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ iYLg[J"  
 CMenu pop; 4M"'B A<  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ue9d0#9  
 CMenu*pMenu=pop.GetSubMenu(0); SVa^:\"$[  
 pMenu->SetDefaultItem(ID_EXITICON); 46f- po_  
 CPoint pt; ?.,F3@W "  
 GetCursorPos(&pt); .B^ tEBGVD  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ]4O!q}@Cd  
 if(id==ID_EXITICON) GNW$:=0u  
  DeleteIcon(); y0 vo-Q  
 else if(id==ID_EXIT) w8+ phN(-M  
  OnCancel(); i`i`Hu>  
 return FALSE; htYfIy{5w  
} D Z~036  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (Tq)!h35B  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _&HFKpHQ  
 AddIcon(); x<t ?Yc9  
 return res; 67/@J)z0%  
} pp|$y\ZzB  
6U).vg<  
void CCaptureDlg::AddIcon() T7qp ({v?Q  
{ M7qg\1L  
 NOTIFYICONDATA data; R Q 8"vF#  
 data.cbSize=sizeof(NOTIFYICONDATA); k6 OO\=  
 CString tip; &LV'"2ng8  
 tip.LoadString(IDS_ICONTIP); =n.&N   
 data.hIcon=GetIcon(0); {U9{*e$=  
 data.hWnd=GetSafeHwnd(); ZXhNn<  
 strcpy(data.szTip,tip); vmxS^_I  
 data.uCallbackMessage=IDM_SHELL; `_DA!  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l/?bXNt  
 data.uID=98; &#C|  
 Shell_NotifyIcon(NIM_ADD,&data); cm!vuoB~~  
 ShowWindow(SW_HIDE); hXH+C-%{  
 bTray=TRUE; *k\ ;G?  
} L]YJ#5  
E\2f"s  
void CCaptureDlg::DeleteIcon() e<DcuF<ZS  
{ kJ* N`=  
 NOTIFYICONDATA data; pvWNiW:~k  
 data.cbSize=sizeof(NOTIFYICONDATA); PYCG#U  
 data.hWnd=GetSafeHwnd();  <}^p5|  
 data.uID=98; )1R[~]y  
 Shell_NotifyIcon(NIM_DELETE,&data); MHE/#G  
 ShowWindow(SW_SHOW); <&+0  
 SetForegroundWindow(); (;Bh7Ft  
 ShowWindow(SW_SHOWNORMAL); 6=%\@  
 bTray=FALSE; S!-t{Q+j^  
}  v?d`fd  
9QD+  
void CCaptureDlg::OnChange() 4[Ko|  
{ G_WFg$7G%  
 RegisterHotkey(); ^K<!`B  
} fG?a"6~  
xJ^B.;>  
BOOL CCaptureDlg::RegisterHotkey() ]'<}kJtN.  
{ f. h3:_r  
 UpdateData(); $U&p&pgH=W  
 UCHAR mask=0; .' v$PEy  
 UCHAR key=0; Gp_flGdGQ  
 if(m_bControl) 0#5&*  
  mask|=4; ZXj*Vu$_4  
 if(m_bAlt) -f'&JwE0=  
  mask|=2; [:izej(\  
 if(m_bShift) MO1H?U hx  
  mask|=1; =BD |uIR  
  key=Key_Table[m_Key.GetCurSel()]; RP^L.X(7^  
 if(bRegistered){ (Ms0pm-#t  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 75h]# k9\  
  bRegistered=FALSE; ?`:+SncI"b  
 } 2L.6!THG  
 cMask=mask; un`4q-S7  
 cKey=key; e6y!,My<  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Dl?:Mh  
 return bRegistered; #T>pu/EQX_  
} `/G9*tIR8g  
-lfbn =3  
  四、小结 {rF9[S"h  
}_}LaEYAo  
  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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