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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 O~RnP  
  _q4O2Fx0  
  一、实现方法 jZPGUoRLg  
5pe)CjE:  
  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: WZPj?ou`G  
cs.t#C  
#pragma data_seg("shareddata") xW*Lceb  
HHOOK hHook =NULL; //钩子句柄 g,!.`[e'ex  
UINT nHookCount =0; //挂接的程序数目 H.E=m0 np  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 dE_"|,:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 )h&@}#A09  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 7pQ 5`;P  
static int KeyCount =0; 6 U[VoUU   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !4=_l6kg~+  
#pragma data_seg() ]@<VLP?  
US(RWXyg  
  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。 *<y9.\z Y<  
DB-79U%W  
  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: .5o~^  
/|P{t{^WM  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR k'H[aYMA  
cKey,UCHAR cMask) %;v~MC @  
{ l9="ccM  
 BOOL bAdded=FALSE; *AQ3RA8  
 for(int index=0;index<MAX_KEY;index++){ #k|f>D4  
  if(hCallWnd[index]==0){ @6tczU}ak  
   hCallWnd[index]=hWnd; ;-@: }/  
   HotKey[index]=cKey; 6SH0 y  
   HotKeyMask[index]=cMask; 5QuRwu_  
   bAdded=TRUE; +y8Y@e}>  
   KeyCount++; G'#u!<(^h  
   break; fRLA;1va  
  } =xRD %Z  
 } l!Xj UnRF  
 return bAdded; +~aIT=i3  
} `PL}8ydZ  
//删除热键 N>"L2E=z$|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z_4%Oi  
{ buN@O7\  
 BOOL bRemoved=FALSE; wv."  
 for(int index=0;index<MAX_KEY;index++){ ^uN[rHZ*u  
  if(hCallWnd[index]==hWnd){ a{Y|`*7y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ saP%T~  
    hCallWnd[index]=NULL; ~mXzQ be p  
    HotKey[index]=0; d~%7A5  
    HotKeyMask[index]=0; U&u63 56  
    bRemoved=TRUE; VrP{U-`  
    KeyCount--; T1.U (::  
    break; <nD@4J-A0  
   } [~ 2m*Q  
  } :??W3ROn  
 } b~:)d>s8wY  
 return bRemoved; -d#08\  
} [r8[lkR  
7<MEMNYX  
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  DLL中的钩子函数如下: D:bmq93PC  
gDLS)4^w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) EJTM >Rpor  
{ nb=mY&q}~  
 BOOL bProcessed=FALSE; 4c 8{AZ  
 if(HC_ACTION==nCode) l1'v`!  
 { RH<2f5-sC!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 M.}J SDt  
   switch(wParam) kBcTXl  
   {  rDbtT*vN  
    case VK_MENU: JG'%HJ"D  
     MaskBits&=~ALTBIT; i]? Eq?k  
     break; d]O:VghY\  
    case VK_CONTROL: v+in:\Dv  
     MaskBits&=~CTRLBIT; gMF6f%  
     break; 7:pc%Ksq  
    case VK_SHIFT: (1^;l;7H  
     MaskBits&=~SHIFTBIT; F%o!+%&7  
     break; 4jTO:aPh_  
    default: //judge the key and send message y-nv#Ejr  
     break; L{&2 P  
   } Q~Mkf&s  
   for(int index=0;index<MAX_KEY;index++){ [O&}Qk  
    if(hCallWnd[index]==NULL) 2p](`Y`  
     continue; 0m*b9+q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p{LbTjdNc  
    { Q\kWQOB_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >zX^*T#  
     bProcessed=TRUE; YlbX_h2S"  
    } 9GCK3  
   } )G^k$j  
  } ^U5N!"6R  
  else if((lParam&0xc000ffff)==1){ //有键按下 }aE'  
   switch(wParam) FsWp>}o  
   { WVpx  
    case VK_MENU: Oj_]`  
     MaskBits|=ALTBIT; /96lvn]8lO  
     break;  dV :}  
    case VK_CONTROL: \u[}  
     MaskBits|=CTRLBIT; [niFJI sc  
     break; R3_OCM_*  
    case VK_SHIFT: VED~v#.c  
     MaskBits|=SHIFTBIT; *w(n%f  
     break; t :YZua  
    default: //judge the key and send message GLecBF+>F  
     break;  2hF^U+I}  
   } lkTA"8d  
   for(int index=0;index<MAX_KEY;index++){ fb`x1Q  
    if(hCallWnd[index]==NULL) c:.5@eq^  
     continue; pIC'nO_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :23S%B~X  
    { TBPu&+3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I1':&l^O  
     bProcessed=TRUE; 7<e}5nA/  
    } &-Ch>:[  
   } ri8=u$!  
  } 9MZ)-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 hDB(y4/  
   for(int index=0;index<MAX_KEY;index++){ 3WQa^'u  
    if(hCallWnd[index]==NULL) Sxc)~y  
     continue; %\48hSe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TCRTC0_}k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8\P,2RSnt  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 WJONk_WAc  
   } Bh=t%#y|`  
  } W7uX  
 } 5U7,,oyh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :stHc,  
} :s_.K'4?a  
: H;S"D  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: iE"]S )  
}YdC[b$j^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &2XH.$Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i4i9EvWp  
5)XUT`;'){  
  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: ,P}7e)3  
hGV_K"~I0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ^uUA41o`eJ  
{ }W:Z>vam+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 8,IF%Z+LI  
 { 5|~g2Zz{;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 qqZ4K:oC,  
  SaveBmp(); tT)s,R%  
  return FALSE; >Z_;ZMu)  
 } tkk8b6%h?p  
 …… //其它处理及默认处理 o"X..m<  
} , v} )  
q&>fKSnKs  
1O0. CC,p  
  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。 f?/OV*  
>qNpY(Ql  
  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。 XV%R Mr6  
Wfd`v  
  二、编程步骤 @, fvWNI  
hzM;{g>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"; 2qE_SSXn  
O DN_i  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; E`JW4)AH  
R_/;U&R  
  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; Mo N/?VA  
W3!-;l  
  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; <bhGpLh-E  
s(Gs?6}>T  
  5、 添加代码,编译运行程序。 +d=f_@i  
,5W u  
三、程序代码 h?/E/>  
kB CU+FC  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL - JEPh!oTt  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) H*k\C  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ KH?6O%d  
#if _MSC_VER > 1000 }[z7V  
#pragma once kZ@UQ{>`  
#endif // _MSC_VER > 1000 wg0_J<y]  
#ifndef __AFXWIN_H__ 4_VgJ9@  
#error include 'stdafx.h' before including this file for PCH 5&p}^hS5  
#endif `=hCS0F  
#include "resource.h" // main symbols !c)F;  
class CHookApp : public CWinApp 9F 3,  
{ $Q#n'#c  
 public: rucw{) _  
  CHookApp(); >e/>@ J*  
  // Overrides T:kliM"z  
  // ClassWizard generated virtual function overrides ;6hoG(3 +  
  //{{AFX_VIRTUAL(CHookApp) # A4WFZ  
 public: v=G*K11@  
  virtual BOOL InitInstance(); wX2U   
  virtual int ExitInstance(); "!P h  
  //}}AFX_VIRTUAL $S<B\\ %  
  //{{AFX_MSG(CHookApp)  /d|:  
  // NOTE - the ClassWizard will add and remove member functions here. i9Bh<j>:J  
  // DO NOT EDIT what you see in these blocks of generated code ! j"~"-E(79  
  //}}AFX_MSG '6NrL;  
  DECLARE_MESSAGE_MAP() RICm$,  
}; R[\1Kk(Zo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ylczM^@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q]=/e7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?`xF>P]M  
BOOL InitHotkey();  ]'% iR  
BOOL UnInit(); ;Ngk"5  
#endif 30WOH 'n  
e?;c9]XO,o  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. .u ikte  
#include "stdafx.h" Y5CkCF  
#include "hook.h" \8ZVI98  
#include <windowsx.h> y7h^_D+Ce  
#ifdef _DEBUG _/Ve~( "  
#define new DEBUG_NEW BJ3<"D{.*4  
#undef THIS_FILE O, eoO,gB  
static char THIS_FILE[] = __FILE__; f@!9~s  
#endif $}b)EMMM  
#define MAX_KEY 100 V-(]L:[JQ  
#define CTRLBIT 0x04 egA* x*8  
#define ALTBIT 0x02 l*hWws[  
#define SHIFTBIT 0x01 -!7Z  
#pragma data_seg("shareddata") HTiLA%%6  
HHOOK hHook =NULL; {9|*au(K  
UINT nHookCount =0; ;|XX^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey MXl_{8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT fCNQUK{Gs5  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey e}{#VB<  
static int KeyCount =0; xPm{'J+b~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift }XUI1H]jk  
#pragma data_seg() )P9]/y  
HINSTANCE hins; s% R,]q  
void VerifyWindow(); bnL!PsG$K,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 4|%Y09"lv  
//{{AFX_MSG_MAP(CHookApp) q90RTX'CY  
// NOTE - the ClassWizard will add and remove mapping macros here. DFZ0~+rh  
// DO NOT EDIT what you see in these blocks of generated code! 9xJtDdy-O  
//}}AFX_MSG_MAP 1l)j(,Zd*  
END_MESSAGE_MAP() 7&P70DO  
pFMjfWD,C  
CHookApp::CHookApp() Jjj;v2uSK  
{ rd%uc~/  
 // TODO: add construction code here, Z >R@  
 // Place all significant initialization in InitInstance 2K/t[.8  
} o` QH8  
 I*f@^(  
CHookApp theApp; ))dqC l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) '$p`3Oqi  
{ pLF,rOb  
 BOOL bProcessed=FALSE; 'W9[Vm  
 if(HC_ACTION==nCode) qF(i1#  
 { sd+_NtH  
  if((lParam&0xc0000000)==0xc0000000){// Key up =pmG.>Si  
   switch(wParam) E83$(6z  
   { g*FHZM*N9  
    case VK_MENU: E|-5=!]fX  
     MaskBits&=~ALTBIT; ~eP~c"L  
     break; JP"#9f  
    case VK_CONTROL: Xsanc@w)^C  
     MaskBits&=~CTRLBIT; HhCFAq"j  
     break; b-VQn5W  
    case VK_SHIFT: Q~f]?a`  
     MaskBits&=~SHIFTBIT; xv147"w'v  
     break; p)Q5fh0-  
    default: //judge the key and send message '-f` 5X  
     break; _&gO>G,uy  
   } {I0!q"sF  
   for(int index=0;index<MAX_KEY;index++){ &.2% p  
    if(hCallWnd[index]==NULL) 5G'2 Wby'#  
     continue; #+Bz$CO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }+`,AC`RM  
    { Q: -&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); njJTEUd">  
     bProcessed=TRUE; 7Cz=;  
    } d^~yUk  
   } CaED(0  
  } R86i2',  
  else if((lParam&0xc000ffff)==1){ //Key down Z3wdk6%:}  
   switch(wParam) ^FNju/b  
   { yRQ1Szbjli  
    case VK_MENU: Y cL((6A  
     MaskBits|=ALTBIT; Z;+;_Cw  
     break; "UY34a^I  
    case VK_CONTROL:  nXy"  
     MaskBits|=CTRLBIT; n87Uf$  
     break; p;o"i_!  
    case VK_SHIFT: &'PLOyWw  
     MaskBits|=SHIFTBIT; e)-$ #qW  
     break; [-W~o.`  
    default: //judge the key and send message hB>FJZQ_  
     break; e 5(|9*t  
   } 8* m,#   
   for(int index=0;index<MAX_KEY;index++) z\, lPwB2  
   { ! B`  
    if(hCallWnd[index]==NULL) oMM@{Jp  
     continue; suaP'0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uj%]+Llxv  
    { =kq<J-:#R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); wS$ 'gKA6  
     bProcessed=TRUE; {Eo Z }I  
    } 1=>b\"P#E  
   } k'F*uS  
  } DN*M-o9  
  if(!bProcessed){ VJ&-Z |  
   for(int index=0;index<MAX_KEY;index++){ 9.~ _swkv  
    if(hCallWnd[index]==NULL) ]CU)#X<J  
     continue;  0RCp  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Pu!C,7vUQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "tmu23xQ  
   } 1p/_U?H:|  
  } d"3x11|  
 } $*XTX?,'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^^uY)AL  
} 6 P(jc  
) .V,zmI  
BOOL InitHotkey() $_HyE%F#  
{ 3S>rc0]6  
 if(hHook!=NULL){ 0#Q]>V@rO4  
  nHookCount++; $LU|wW  
  return TRUE; Mz) r'  
 } n sN n>{  
 else a|dgK+[  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); BdvpG  
  if(hHook!=NULL) y{P~!Yn|  
   nHookCount++; #QOb[9(Tu(  
  return (hHook!=NULL); kyYU 1gfh  
} ]$UTMuO Ql  
BOOL UnInit() !qH)ttW  
{ ^{8CShUCv  
 if(nHookCount>1){ X`E}2|q'  
  nHookCount--; $Mx?Y9!  
  return TRUE; ]E.FBGT  
 } RSM+si/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); m\=Cw&(  
 if(unhooked==TRUE){ RWDPsZC  
  nHookCount=0; uE,T Ea9;  
  hHook=NULL; ^MhMYA  
 } `X&d:!}F  
 return unhooked; -@'RYY=  
} %vG;'_gM B  
D iHj!tZN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^h`rA"F\  
{ cI7aTLC"s  
 BOOL bAdded=FALSE; }LWrtmc  
 for(int index=0;index<MAX_KEY;index++){ %f&Bt,xEo  
  if(hCallWnd[index]==0){ ^s=F<_{  
   hCallWnd[index]=hWnd; yRhD<*  
   HotKey[index]=cKey; 5ry[Lgg  
   HotKeyMask[index]=cMask; Z\1`(Pq7`  
   bAdded=TRUE; 0!axAvBV  
   KeyCount++; n:<Xp[;R  
   break; ay{]Vqi9  
  } *`bES V :  
 } 6l"4F6  
 return bAdded; OMjx,@9  
} Z#;\Rb.x7  
hn&NypI  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3Dh{#"88  
{ _|{pO7x]oG  
 BOOL bRemoved=FALSE; !D 'A  
 for(int index=0;index<MAX_KEY;index++){ S->Sp  
  if(hCallWnd[index]==hWnd){ 5VN~?#K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ NfCo)C-t  
    hCallWnd[index]=NULL; O]25 {L  
    HotKey[index]=0; I|/|\  
    HotKeyMask[index]=0; yaI jXv  
    bRemoved=TRUE; --`W1!jI@  
    KeyCount--; Sn;q:e3i{A  
    break; nu16L$ ]  
   } P^BSl7cT  
  } KWw?W1H  
 } z5f3T D6,  
 return bRemoved; ; ?,'jI*1  
} rO,n~|YJ  
]7|qhAh<L  
void VerifyWindow() X5Y. o&  
{ b%j4W)Z  
 for(int i=0;i<MAX_KEY;i++){ _z"\3hZ  
  if(hCallWnd!=NULL){ Z= pvoTY  
   if(!IsWindow(hCallWnd)){ PB{5C*Y7^k  
    hCallWnd=NULL; DxP65wU  
    HotKey=0; $*9:a3>zny  
    HotKeyMask=0; K}LF ${bS  
    KeyCount--; . Eb=KG  
   } cgQ2Wo7tCq  
  } V4gvKWc  
 } m O0#xY_z  
} $A:?o?"7}  
 n4AQ  
BOOL CHookApp::InitInstance() _[hVGCSB  
{ @Y6~;(p  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'sjks sy.3  
 hins=AfxGetInstanceHandle(); 3"6-X_  
 InitHotkey(); R <u\ -  
 return CWinApp::InitInstance(); Xpmi(~n  
} OZl0I#@A  
!8J%%Ux&M  
int CHookApp::ExitInstance() x Sv@K5"8!  
{ MWn []'TpH  
 VerifyWindow(); =vKSvQP@)  
 UnInit(); bxww1NG>|Z  
 return CWinApp::ExitInstance(); `9G1Bd8k  
} c/G^}d%  
0t00X/  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file .YIb ny1  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) -s:NF;"  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ j&,%v+x  
#if _MSC_VER > 1000 /.1h_[K]  
#pragma once &<5oDdC  
#endif // _MSC_VER > 1000 =I)Ex)  
_M[T8"e(  
class CCaptureDlg : public CDialog (ZK(ODn)i  
{ Biy$p6  
 // Construction `lE8dwL  
 public: 1uc;:N G=  
  BOOL bTray; @ |7e~U  
  BOOL bRegistered; S#Pni}JD  
  BOOL RegisterHotkey(); Q"`J-#L  
  UCHAR cKey; .iEzEmu  
  UCHAR cMask; Io)@u~yz  
  void DeleteIcon(); g _u  
  void AddIcon(); 8.D9OpU  
  UINT nCount; J|o )c~  
  void SaveBmp(); R<8!lQ4s  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor OQsF$% *   
  // Dialog Data >Co5_sCe  
  //{{AFX_DATA(CCaptureDlg) ;e ^`r;]  
  enum { IDD = IDD_CAPTURE_DIALOG }; iD!]I$  
  CComboBox m_Key; N1z:9=(I  
  BOOL m_bControl; Bf6\KI<V2  
  BOOL m_bAlt; 'uF"O"*  
  BOOL m_bShift; E`UEl$($  
  CString m_Path; nOUF<DNQ  
  CString m_Number; !\1Pu|  
  //}}AFX_DATA O<qo%fP  
  // ClassWizard generated virtual function overrides 6y)NH 8l7  
  //{{AFX_VIRTUAL(CCaptureDlg) 5!d'RBO   
 public: oOy_2fwZPp  
  virtual BOOL PreTranslateMessage(MSG* pMsg); G9a6 $K)b  
 protected: {rZ )!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JXF@b-c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Q>>II|~;J  
  //}}AFX_VIRTUAL l=t$ XWh!  
  // Implementation \@:mq]Y  
 protected: 3R$*G8v  
  HICON m_hIcon; W&0KO-}ot  
  // Generated message map functions !5[5l!{x  
  //{{AFX_MSG(CCaptureDlg) 2z0 27P-Q  
  virtual BOOL OnInitDialog(); x]jJ  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); X/`M'8v.%  
  afx_msg void OnPaint(); nfjwWDH  
  afx_msg HCURSOR OnQueryDragIcon(); A;C)#Q/  
  virtual void OnCancel(); G8!* &vR/  
  afx_msg void OnAbout(); c7(Lk"G8  
  afx_msg void OnBrowse(); YST{ h{  
  afx_msg void OnChange(); #R3|nL  
 //}}AFX_MSG $2gZpO|  
 DECLARE_MESSAGE_MAP() nJ~5ICyd  
}; 97L# 3L6t  
#endif ygfUy  
R8<P}mv  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "94qBGf  
#include "stdafx.h" %13V@'e9  
#include "Capture.h" :B]yreg  
#include "CaptureDlg.h" f 8836<c  
#include <windowsx.h> @t?uhT*Z=  
#pragma comment(lib,"hook.lib") O0 ,=@nw8.  
#ifdef _DEBUG |4|j5<5  
#define new DEBUG_NEW `%S#XJU  
#undef THIS_FILE %w3"B,k'9D  
static char THIS_FILE[] = __FILE__; Omy<Y@$  
#endif )wueR5P  
#define IDM_SHELL WM_USER+1 E(G&mfhb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $fl+l5?9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  a EmLf  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _mn2bc9M  
class CAboutDlg : public CDialog ORP-@-dap  
{ lr_c  
 public: P+t`Rw  
  CAboutDlg(); Ov PTgiI!N  
  // Dialog Data x 2Cp{+}  
  //{{AFX_DATA(CAboutDlg) %T'<vw0  
  enum { IDD = IDD_ABOUTBOX }; r;c ILS|Xr  
  //}}AFX_DATA 79O'S du@  
  // ClassWizard generated virtual function overrides VgyY7INx9  
  //{{AFX_VIRTUAL(CAboutDlg) <m X EX`?  
 protected: x l4A<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Pmj%QhOYE  
  //}}AFX_VIRTUAL M|xs>+r*  
  // Implementation 2Bg0 M  
 protected: Y ]6kA5  
  //{{AFX_MSG(CAboutDlg) `PApmS~} .  
  //}}AFX_MSG Vmf !0-  
  DECLARE_MESSAGE_MAP() ]ovb!X_  
}; hO] vy>i;  
H$={i$*,Y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) M"Q{lR  
{ ];8S<KiS~  
 //{{AFX_DATA_INIT(CAboutDlg) .DG`~Fpk  
 //}}AFX_DATA_INIT UY$Lqe~  
} 7F@#6  
tzV^.QWm  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9B<aYp)  
{ KoKd.%  
 CDialog::DoDataExchange(pDX); G=l-S\0@  
 //{{AFX_DATA_MAP(CAboutDlg) Ek%mX"  
 //}}AFX_DATA_MAP XlDN)b5v{  
} `4kVe= {  
GP{$w_'!J0  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) @m+2e C77  
 //{{AFX_MSG_MAP(CAboutDlg) ::R5F4  
 // No message handlers  \qj(`0HG  
 //}}AFX_MSG_MAP SM8Wg>  
END_MESSAGE_MAP() 0S71&I$u]  
G24 Ov&H  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !$L~/<&0g  
: CDialog(CCaptureDlg::IDD, pParent) FH7h?!|t  
{ ee\QK,QV  
 //{{AFX_DATA_INIT(CCaptureDlg) #$0*Gd-N  
  m_bControl = FALSE; !}PZCbDhL  
  m_bAlt = FALSE; B Ms?+  
  m_bShift = FALSE; w9]HJ3qi  
  m_Path = _T("c:\\"); 2U.'5uA"L  
  m_Number = _T("0 picture captured."); ;G|#i? JJ  
  nCount=0; ' >R?8Y  
  bRegistered=FALSE; x,:DL)$1  
  bTray=FALSE; 5~GH*!h%;  
 //}}AFX_DATA_INIT ,zVS}!jRhy  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]m<z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); >&%#`PKT  
} q)PLc{NO  
Bx 9v2x.  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d.Ep#4  
{ GLWEoV9<  
 CDialog::DoDataExchange(pDX); $@^*lUw  
 //{{AFX_DATA_MAP(CCaptureDlg) v1}9i3Or#  
  DDX_Control(pDX, IDC_KEY, m_Key); 5DxNHEuS  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 13K|=6si  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^n~bx *f  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1'4?}0Dok  
  DDX_Text(pDX, IDC_PATH, m_Path); +LwwI*;b  
  DDX_Text(pDX, IDC_NUMBER, m_Number); [D_s`'tg  
 //}}AFX_DATA_MAP =}UcYC6l  
} =k^ d5  
hnBX enT6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @|'$k{i  
//{{AFX_MSG_MAP(CCaptureDlg) 8@A}.:  
 ON_WM_SYSCOMMAND() wU(!fw\  
 ON_WM_PAINT() b>]k=zd  
 ON_WM_QUERYDRAGICON() ^ DCBL&I  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) x|`BF%e/v  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) t 0.71(  
 ON_BN_CLICKED(ID_CHANGE, OnChange) r&3EM[*Iw  
//}}AFX_MSG_MAP %fMFcL#h  
END_MESSAGE_MAP() R1vuf*A5,  
*%CDQx0}  
BOOL CCaptureDlg::OnInitDialog() 9v@P|  
{ i+ICgMcd  
 CDialog::OnInitDialog(); "DvhAEM  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); F4DJML-(  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]8f$&gw&A  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ToR@XL!%rP  
 if (pSysMenu != NULL) "6q@}sz!  
 { \c4D|7\=  
  CString strAboutMenu; 7Fzj&!>ti  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \=uD)9 V  
  if (!strAboutMenu.IsEmpty()) .H 9 r_  
  { o@sL/5,  
   pSysMenu->AppendMenu(MF_SEPARATOR); weC.k x   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); +vt?3i\^.  
  } kX%vTl7F  
 } d.$0X/0  
 SetIcon(m_hIcon, TRUE); // Set big icon Q8D#kAYw  
 SetIcon(m_hIcon, FALSE); // Set small icon L@"&s#~=3  
 m_Key.SetCurSel(0); {uN-bl?o  
 RegisterHotkey(); M$s9   
 CMenu* pMenu=GetSystemMenu(FALSE); EGVS8YP>h  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); LK+67Y{25  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); @{{6Nd5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); >S>B tR l  
 return TRUE; // return TRUE unless you set the focus to a control tUi@'%>=5  
} XaF;IS@A  
~,7Tj  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %>!W+rO,  
{ J p)I9k,Ez  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) *i>hFNLdOM  
 { NA=m<n#  
  CAboutDlg dlgAbout; 4*'ZabDD  
  dlgAbout.DoModal(); J,:Wv`N:9~  
 } 4s 6,`-  
 else 4JRQ=T|P7I  
 { 2Mu@P8O&  
  CDialog::OnSysCommand(nID, lParam); 08+\fT [  
 } 5,J.$Sax  
} bbT1p :RF  
0BQ{ZT-Kh  
void CCaptureDlg::OnPaint() >i"WKd=  
{ |3mcL'  
 if (IsIconic()) *alifdp  
 { QB3er]y0%  
  CPaintDC dc(this); // device context for painting dU-nE5  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); HCT+.n6  
  // Center icon in client rectangle u#UtPF7q  
  int cxIcon = GetSystemMetrics(SM_CXICON); .uSVZqJ7  
  int cyIcon = GetSystemMetrics(SM_CYICON); _rg*K  
  CRect rect; OwPXQ 3S  
  GetClientRect(&rect); Jl<pWjkZZ  
  int x = (rect.Width() - cxIcon + 1) / 2; P*n/qj8h  
  int y = (rect.Height() - cyIcon + 1) / 2; o8Yq3N+  
  // Draw the icon G > t  
  dc.DrawIcon(x, y, m_hIcon); mVEIHzk2b  
 } kD(#LM<9s  
 else \k{d'R#~(  
 { Mm;[f'{M)  
  CDialog::OnPaint(); 3&6sQ-}*  
 } "}vxHN#  
} 86);0EBX  
| {Q}:_/q  
HCURSOR CCaptureDlg::OnQueryDragIcon() 3YG%YhevO  
{ "RTv[n!  
 return (HCURSOR) m_hIcon; m d `=2l  
} zkquXzlgB  
>qBJK)LHOv  
void CCaptureDlg::OnCancel() -]t>'Q?  
{ 9/_~YY=/h  
 if(bTray) Hb/8X !=  
  DeleteIcon(); ~C>clkZ  
  CDialog::OnCancel(); rv`GOta*  
} 1 @i/N  
Nt\0) &b  
void CCaptureDlg::OnAbout() ^*w}+tB  
{ "T*1C=  
 CAboutDlg dlg; sX-@ >%l  
 dlg.DoModal(); 7'#_uA QR  
} s bd$.6 |&  
djqw5kO:R  
void CCaptureDlg::OnBrowse() |*^}e54  
{ N>CNgUyP  
 CString str; :| !5d{8S8  
 BROWSEINFO bi; > `mV^QD  
 char name[MAX_PATH]; %=$Knc_!T^  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yy+:x/(N[  
 bi.hwndOwner=GetSafeHwnd(); &*74 5,e  
 bi.pszDisplayName=name; o=6 <?v7  
 bi.lpszTitle="Select folder"; 6AoKuT;  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; IJVzF1vC  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [] el4.J,  
 if(idl==NULL) lF t^dl^  
  return; ?C- ju8]|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); U1(cBY  
 str.ReleaseBuffer(); V(8,94vm  
 m_Path=str; j^WYM r,  
 if(str.GetAt(str.GetLength()-1)!='\\') j+rY  
  m_Path+="\\"; "l hj1zZ  
 UpdateData(FALSE); 0wCQPvO  
} |3^U\r^zo  
r-*j"1 e  
void CCaptureDlg::SaveBmp() 3 NFo=Z8  
{ x6^Y&,y9kU  
 CDC dc; *Q)-"]O(k  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); %'X~9Pvi  
 CBitmap bm; r*dNta<  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1xu~@v 60  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]s!id[j  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 9 4^b"hU  
 CDC tdc; 7&D)+{g  
 tdc.CreateCompatibleDC(&dc); CO9PQ`9+  
 CBitmap*pOld=tdc.SelectObject(&bm); ) iZU\2L  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c&N;r|N  
 tdc.SelectObject(pOld); L|L|liWd  
 BITMAP btm; #kh:GAp]  
 bm.GetBitmap(&btm); p<zeaf0W  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 5S, Kq35$(  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )8oN$2 0  
 BITMAPINFOHEADER bih; J_fs}Y1q\  
 bih.biBitCount=btm.bmBitsPixel; Pd-LDs+Ga  
 bih.biClrImportant=0; `HO] kJpX  
 bih.biClrUsed=0; ~9xkiu5~  
 bih.biCompression=0; ; O(Ml}z  
 bih.biHeight=btm.bmHeight; bt(Y@3;  
 bih.biPlanes=1; )EQz9  
 bih.biSize=sizeof(BITMAPINFOHEADER); v~yw-}fk%  
 bih.biSizeImage=size; H^54o$5  
 bih.biWidth=btm.bmWidth; w/"vf3}(9  
 bih.biXPelsPerMeter=0; \.}ZvM$  
 bih.biYPelsPerMeter=0; %H;}+U]Z  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8a&c=9  
 static int filecount=0; `6lOqH  
 CString name; ^G2M4+W|  
 name.Format("pict%04d.bmp",filecount++); SM%/pu;  
 name=m_Path+name; D.Cn`O}  
 BITMAPFILEHEADER bfh; jm@,Ihz=wI  
 bfh.bfReserved1=bfh.bfReserved2=0; ];"40/X  
 bfh.bfType=((WORD)('M'<< 8)|'B'); l($ 8H AJ  
 bfh.bfSize=54+size; R\XS5HOE(  
 bfh.bfOffBits=54; 5IOGH*'U8  
 CFile bf; \*'@F+  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Kn<+Au_]L  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Z4c'1-lh  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); /qMnIo  
  bf.WriteHuge(lpData,size); y:^o ._  
  bf.Close(); xm1'  
  nCount++; #"lb9. _ M  
 } /!^,+  
 GlobalFreePtr(lpData); *^Ges;5 $"  
 if(nCount==1) 9bM kP2w>  
  m_Number.Format("%d picture captured.",nCount); 4c95G^dZ  
 else UCK;?]  
  m_Number.Format("%d pictures captured.",nCount); 8|<</v8i  
  UpdateData(FALSE); |Olz h63k:  
} `/'p1?Z"  
1G.?Y3DC<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Z^z{, u;!  
{ K *{RGE  
 if(pMsg -> message == WM_KEYDOWN) I>JE\## ^n  
 { rsLkH&aM  
  if(pMsg -> wParam == VK_ESCAPE) PH%'^YAl7  
   return TRUE; #ACT&J  
  if(pMsg -> wParam == VK_RETURN) sW'_K.z  
   return TRUE; [7d(P EQL`  
 } *9uNM@7&0  
 return CDialog::PreTranslateMessage(pMsg); ^_g%c&H  
} S9] I [4  
~]QQaP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L\UGC%]9  
{ "]kzt ux  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -CuuO=h  
  SaveBmp(); 8)=(eI$  
  return FALSE; </D.}ia  
} }Hq3]LVE  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ez"*',(  
 CMenu pop; Y]KHCY  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); dNNXMQ0"  
 CMenu*pMenu=pop.GetSubMenu(0); D)?%kNeA  
 pMenu->SetDefaultItem(ID_EXITICON); \#LDX,=  
 CPoint pt; rab$[?]  
 GetCursorPos(&pt); FU/:'/ L  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 4w=v /WDo  
 if(id==ID_EXITICON) fM7B<eB  
  DeleteIcon(); Y0krFhL'x0  
 else if(id==ID_EXIT) 9jY+0h*uP  
  OnCancel(); +])<}S!M  
 return FALSE; ?bt;i>O\  
} 88,hza`#V  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); wpt$bqs|1  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) nW"O+s3  
 AddIcon(); VevG 64o  
 return res; K-)!d$$   
} D_0sXIbg  
,[6Rmsk  
void CCaptureDlg::AddIcon() d'ZB{'[8p  
{ /;d 5p  
 NOTIFYICONDATA data; dO%f ;m>#  
 data.cbSize=sizeof(NOTIFYICONDATA); R!QR@*N  
 CString tip; H"(#Tp ZTE  
 tip.LoadString(IDS_ICONTIP); O8b#'f~  
 data.hIcon=GetIcon(0); cW_wIy\]&  
 data.hWnd=GetSafeHwnd(); f S/:OnH  
 strcpy(data.szTip,tip); M>Tg$^lm  
 data.uCallbackMessage=IDM_SHELL; }2LWDQ;po  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; % &&)[  
 data.uID=98; }4!}vkVx  
 Shell_NotifyIcon(NIM_ADD,&data); LKp;sV  
 ShowWindow(SW_HIDE); 3<+ZA-2  
 bTray=TRUE; JDZuT#  
} ^67}&O^1 ,  
l0`bseN <  
void CCaptureDlg::DeleteIcon() 0m]QQGvJ{  
{ F~fBr  
 NOTIFYICONDATA data; T9& {s-3*  
 data.cbSize=sizeof(NOTIFYICONDATA); }T(=tfv@  
 data.hWnd=GetSafeHwnd(); ~!~i_L\V  
 data.uID=98; <mlN\BcX;  
 Shell_NotifyIcon(NIM_DELETE,&data); l+>Y  
 ShowWindow(SW_SHOW); !;h&@LXG(  
 SetForegroundWindow(); 2 G2+oS ?  
 ShowWindow(SW_SHOWNORMAL); \A01 1R&  
 bTray=FALSE; 97\K] Tr  
} p7-\a1P3  
FXDB> }8  
void CCaptureDlg::OnChange() hZ452W  
{ K$,<<hl  
 RegisterHotkey(); s|A[HQUtJ  
} e+-#/i*  
6q8}8;STTY  
BOOL CCaptureDlg::RegisterHotkey() ^pd7nr~Y  
{ %q3`k#?<  
 UpdateData(); ut\ X{.r7  
 UCHAR mask=0; B!,&{[D  
 UCHAR key=0; Nv.  
 if(m_bControl) w^ z ftm  
  mask|=4; xok T  
 if(m_bAlt) $;G<!]& s  
  mask|=2; He'VqUw_  
 if(m_bShift) 5NUaXQ  
  mask|=1; O2ktqAWx@  
  key=Key_Table[m_Key.GetCurSel()]; >I5Wf /$  
 if(bRegistered){ Vn kh Y  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?xH{7)dO  
  bRegistered=FALSE; wU!-sf;]y  
 } (|Gwg\r  
 cMask=mask; EK=0oy[  
 cKey=key; (?8i^T?WP=  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yUJ#LDW  
 return bRegistered;  OM1{-W  
} 8)?&eE'  
n0co* ]X+k  
  四、小结 x$` lQ%  
$Z]@N nA9N  
  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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