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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: fOrH$?  
  re<{ >  
  一、实现方法 t@;p  
wlvgg  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Z{d^-  
ajT*/L!0_  
#pragma data_seg("shareddata") 3?yg\  
HHOOK hHook =NULL; //钩子句柄 @mBQ?; qlK  
UINT nHookCount =0; //挂接的程序数目 Y=KTeYW`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 D_7,m%Z:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 T-L||yE,h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey vr l-$ii  
static int KeyCount =0; u=sp`%?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 l)\! .X  
#pragma data_seg()  _[3D  
+sA2WK]  
  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。 $%Kf q[Q  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 3hH<T.@)  
=nS3p6>rZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR #!# l45p6  
cKey,UCHAR cMask) 6 "sSoj  
{ B9 uoVcW  
 BOOL bAdded=FALSE; WH}y"W  
 for(int index=0;index<MAX_KEY;index++){ ]m<$}  
  if(hCallWnd[index]==0){ I236 RIq  
   hCallWnd[index]=hWnd;  (ZizuHC  
   HotKey[index]=cKey; F>l] 9!P|m  
   HotKeyMask[index]=cMask; e !Y~Qy  
   bAdded=TRUE; !pW0qX\1n  
   KeyCount++; T^KKy0ZGM  
   break; }0z)5c  
  } GxxW&y  
 } %> eiAB_b  
 return bAdded; 2zb"MEOS5  
} j^JPZ{ej ?  
//删除热键 fr3d  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L2z[   
{ kevrsV]/$  
 BOOL bRemoved=FALSE; /3T1U  
 for(int index=0;index<MAX_KEY;index++){ 7$=In K  
  if(hCallWnd[index]==hWnd){ KpGhQdR#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?`ZU R& 20  
    hCallWnd[index]=NULL; =,8]nwgo  
    HotKey[index]=0; HV|,}Wks6s  
    HotKeyMask[index]=0; r19 pZAc  
    bRemoved=TRUE; (A#^l=su  
    KeyCount--; eauF ~md,  
    break; Q &JUt(  
   } KRzAy)8  
  } Yq KCeg  
 } %u'u kcL7  
 return bRemoved; uXvtfc  
} ?tbrbkx  
wHy!CP%  
:I#V.  
  DLL中的钩子函数如下: &QgR*,5eo  
}}~|!8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) C'x&Py/#  
{ :o3N;*o>)0  
 BOOL bProcessed=FALSE; l_p2Riv  
 if(HC_ACTION==nCode) ,J@  
 { GTd,n=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 #6=  
   switch(wParam) {wKB;?fUvk  
   {  {<KVx9  
    case VK_MENU: ?caSb =f  
     MaskBits&=~ALTBIT; [W&T(%(W-  
     break; S9.o/mr  
    case VK_CONTROL: 4pvMd  
     MaskBits&=~CTRLBIT; hgq;`_;1,  
     break; ZECfR>`x  
    case VK_SHIFT: qE"OB  
     MaskBits&=~SHIFTBIT; zDG b7S{  
     break; H:| uw  
    default: //judge the key and send message 9'B `]/L  
     break; oEv 'dQ9  
   } Dd|VMW=  
   for(int index=0;index<MAX_KEY;index++){ 2^7`mES  
    if(hCallWnd[index]==NULL) AK4t\D)K1  
     continue; QXK{bxwC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W=?<<dVYD  
    { ? J0y|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); z24q3 3O  
     bProcessed=TRUE; 2?Vd5xkt  
    } 'g\4O3&_  
   } L4W5EO$  
  } R|(a@sL  
  else if((lParam&0xc000ffff)==1){ //有键按下 9 68Ez  
   switch(wParam) Pq$n5fZC !  
   { 1% `Rs  
    case VK_MENU: ? r4>"[  
     MaskBits|=ALTBIT; wCBplaojJ  
     break; :ws<-Qy  
    case VK_CONTROL: (bS&D/N.  
     MaskBits|=CTRLBIT; }SZd  
     break; 3v-~K)hl?  
    case VK_SHIFT: Vurq t_nb  
     MaskBits|=SHIFTBIT; %cn<ych G  
     break; Kg]J/|0\  
    default: //judge the key and send message tH4B:Bgj!  
     break; #'`{Qv0,  
   } c:('W16  
   for(int index=0;index<MAX_KEY;index++){ n$R)>n Y  
    if(hCallWnd[index]==NULL) 2=}FBA,2  
     continue; [-w%/D%@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Hl=xW/%6y  
    { 2\$oV  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); BgT*icd8d  
     bProcessed=TRUE; c71y'hnT  
    } dE3) | %  
   } sLk-x\P]|  
  } \;Weizq5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 er\|i. Y  
   for(int index=0;index<MAX_KEY;index++){ 6A ah9   
    if(hCallWnd[index]==NULL) |.dRily+  
     continue; |w=zOC;v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ['D]>Ot68  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); <_+X 88  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 BA.uw_^4  
   } XjBD{m(  
  } /$m;y[[  
 } zQ PQ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /dHF6yW  
} /bmN\I  
a+QpM*n7Lq  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Ny# ^&-K  
Gc7=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); LP=)~K<  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); RnN!2K  
W,u:gzmhw  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: [Rb+q=z#  
j8gdlIx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zuCSj~  
{ K sCyFp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) :!QAC@  
 { L/[K"  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 2an f$^[  
  SaveBmp(); <VE@DBWyl~  
  return FALSE; dRMx[7jVA  
 } : Dp0?&_  
 …… //其它处理及默认处理 F'Z,]b'st3  
} 5r0YA IJ  
lhJ'bYI  
30{ gI0jk  
  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。 p ll)Y  
$[|mGae  
  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。 *1"+%Z^  
=~gvZV-<  
  二、编程步骤 9YGY,s x  
Y/oHu@ _  
  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"; +C)~bb*  
/wv0i3_e  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <3 uNl  
'ga/  
  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; VU#7%ufu&  
jiGTA:v  
  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; pfPz8L.7  
wuBPfb  
  5、 添加代码,编译运行程序。 TA\vZGJ('  
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三、程序代码 .)3<Q}>  
TqQ[_RKg2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +`15le`R  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) *WZA9G#V5  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4ppz,L,4  
#if _MSC_VER > 1000 JGZBL{8  
#pragma once n"8Yv~v*2j  
#endif // _MSC_VER > 1000 EX"yxZ~  
#ifndef __AFXWIN_H__ ^rz_f{c]-  
#error include 'stdafx.h' before including this file for PCH n{jGOfc  
#endif "  1tH  
#include "resource.h" // main symbols >mkFV@`  
class CHookApp : public CWinApp jWgX_//!  
{ H/Jbk*Q  
 public: A}w/OA97RO  
  CHookApp(); ?A0)L27UE&  
  // Overrides sos5Y}  
  // ClassWizard generated virtual function overrides z9"U!A4  
  //{{AFX_VIRTUAL(CHookApp) dWW.Y*339  
 public: $Kd>:f=A  
  virtual BOOL InitInstance(); |[lKY+26:{  
  virtual int ExitInstance(); AFn7uW!9Gw  
  //}}AFX_VIRTUAL HKeK<V  
  //{{AFX_MSG(CHookApp) BLFdHB.$T  
  // NOTE - the ClassWizard will add and remove member functions here. =|9!vzG4  
  // DO NOT EDIT what you see in these blocks of generated code ! ^^Vg~){4  
  //}}AFX_MSG d_ CT $  
  DECLARE_MESSAGE_MAP() MOC/KNb  
}; eH,or,r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); A(XKyEx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j1Ezf=N6`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4z)]@:`}z  
BOOL InitHotkey(); ?4uL-z](V  
BOOL UnInit(); )gi9f1n`  
#endif d5-qZ{W  
r<\u6jF  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,z6~?6m  
#include "stdafx.h" 0`H# '/  
#include "hook.h" qSQ~D(tO  
#include <windowsx.h> 1*7@BP5  
#ifdef _DEBUG Zd&S@Z  
#define new DEBUG_NEW ('~LMu_  
#undef THIS_FILE &Qm@9Is  
static char THIS_FILE[] = __FILE__; V6Dbd" i9  
#endif ,,TnIouy  
#define MAX_KEY 100 $ Q0n  
#define CTRLBIT 0x04 31)&vf[[  
#define ALTBIT 0x02 ]'S^]  
#define SHIFTBIT 0x01 6B-16  
#pragma data_seg("shareddata") t,' <gI  
HHOOK hHook =NULL; JtZ7ti  
UINT nHookCount =0; 5-M-X#(  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey AwN!;t_0+N  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT s^SJY{  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey LQ% `c  
static int KeyCount =0; t<qiGDJ<d  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift nFn5v'g  
#pragma data_seg() N g,j#  
HINSTANCE hins; :EyD+!LJ  
void VerifyWindow(); E"0>yl)  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) >d6|^h'0  
//{{AFX_MSG_MAP(CHookApp) mc3"`+o  
// NOTE - the ClassWizard will add and remove mapping macros here. 4+ig' |o  
// DO NOT EDIT what you see in these blocks of generated code! I:.s_8mH}  
//}}AFX_MSG_MAP M3AXe]<eC1  
END_MESSAGE_MAP() Pc9H0\+Xk  
]f3>-)$*  
CHookApp::CHookApp() PW4q~rc=:  
{ ;d?R:Uw8  
 // TODO: add construction code here, Js;h%  
 // Place all significant initialization in InitInstance hOeRd#AQK  
} z)"=:o7  
~s{$WL&  
CHookApp theApp; svSVG:48  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E'8;10s  
{ bZ6+,J  
 BOOL bProcessed=FALSE; KmF]\:sMD  
 if(HC_ACTION==nCode) E.f%H(b  
 { r=4eP(w=  
  if((lParam&0xc0000000)==0xc0000000){// Key up @WB@]-+J T  
   switch(wParam) nP$9CA  
   { ElXFeJ%[G  
    case VK_MENU: c%&>p||  
     MaskBits&=~ALTBIT; y)*RV;^  
     break; H>C=zo,oiC  
    case VK_CONTROL: Cyp'?N  
     MaskBits&=~CTRLBIT; olcDt&xv]  
     break; wS*E(IAl  
    case VK_SHIFT: Q.[0ct  
     MaskBits&=~SHIFTBIT; Mfs?x a  
     break; N;gfbh]  
    default: //judge the key and send message ;\]@K6m/Ap  
     break; *`U~?q}  
   } dRDnJc3  
   for(int index=0;index<MAX_KEY;index++){ xkn;,`t^lJ  
    if(hCallWnd[index]==NULL) v2?ZQeHr_(  
     continue; 5)E @F9N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S[N5 ikg  
    { W4N{S.#!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); F5Va+z,jg  
     bProcessed=TRUE; +qoRP2  
    } ;);kEq/=P  
   } h\e.e3/  
  } Y0>y8U V  
  else if((lParam&0xc000ffff)==1){ //Key down *2?@ |<(r  
   switch(wParam) :Sma`U&  
   { g5yJfRLxp  
    case VK_MENU: ]?*wbxU0  
     MaskBits|=ALTBIT; r3Ykz%6  
     break; /o[w4d8  
    case VK_CONTROL: :%.D78&  
     MaskBits|=CTRLBIT; HV.t6@\};  
     break; O84i;S+-p  
    case VK_SHIFT: oQ#8nu{k  
     MaskBits|=SHIFTBIT; m2o0y++TjW  
     break; ]tD]Wx%  
    default: //judge the key and send message SdWV3  
     break; &o*A {  
   } <q SC#[xu  
   for(int index=0;index<MAX_KEY;index++) OY d !v`<  
   { 3Y &d=  
    if(hCallWnd[index]==NULL) 1qch]1 ^G  
     continue; 0mnw{fE8_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]! dTG  
    { / +\9S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6pzSp  
     bProcessed=TRUE; (?c-iKGc  
    } OH88n69  
   } G9lUxmS<  
  } 7"mc+QOp  
  if(!bProcessed){ Zh,71Umz  
   for(int index=0;index<MAX_KEY;index++){ g ?k=^C  
    if(hCallWnd[index]==NULL) IU[ [ H#  
     continue; <N)oS-m>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >bxS3FCX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `g,..Ns-r  
   } k\IbIv7?i  
  } [~ fraK,)  
 } R@0R`Zs  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); p[-O( 3Y  
} R2;  
1,~D4lD|  
BOOL InitHotkey() y^k$Us  
{ /,dz@   
 if(hHook!=NULL){ Gq6*SaTk  
  nHookCount++; TJN4k@\$2  
  return TRUE; Si7*& dw=  
 } aYeR{Y]  
 else <[v[ci  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %RVZD#zr  
  if(hHook!=NULL) IcEdG(  
   nHookCount++; )7d&NE_  
  return (hHook!=NULL); j [a(#V{  
} ZoeD:xnh[  
BOOL UnInit() TV:9bn?r)  
{ Mhu*[a=;x  
 if(nHookCount>1){ XuTD\g3)  
  nHookCount--; O8o3O 6[Y  
  return TRUE; 2T1q?L?]  
 } OVJ0}5P*  
 BOOL unhooked = UnhookWindowsHookEx(hHook); S3#>9k;p  
 if(unhooked==TRUE){ s.#`&Sd>  
  nHookCount=0; z{6Z 11|  
  hHook=NULL; l.]xB,k  
 } h 0|s  
 return unhooked; @c#(.=  
} >usL*b0%  
*I+Q~4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b'g )  
{ ,I9bNO,%JK  
 BOOL bAdded=FALSE; BWNi [^]  
 for(int index=0;index<MAX_KEY;index++){ W/ \g~=vo  
  if(hCallWnd[index]==0){ No$3"4wk  
   hCallWnd[index]=hWnd;  bLL2  
   HotKey[index]=cKey; HsWk*L `y  
   HotKeyMask[index]=cMask; : DNjhZ  
   bAdded=TRUE; RNL9>7xV  
   KeyCount++; D=$)n_F  
   break; #z(]xI)"  
  } *hrvYil2b  
 } teP<!RKNb  
 return bAdded; t7pFW^&  
} jo7\`#(Q  
t:S+%u U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hb-%_c"kq  
{ TzZq(? V  
 BOOL bRemoved=FALSE; b$7 +;I;  
 for(int index=0;index<MAX_KEY;index++){ IgzQr >  
  if(hCallWnd[index]==hWnd){ 3R/bz0 V>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7^285)UQA  
    hCallWnd[index]=NULL; NHt\ U9l'  
    HotKey[index]=0; rjP/l6 ~'  
    HotKeyMask[index]=0; @CoIaUVP  
    bRemoved=TRUE; lYIH/:T  
    KeyCount--; `XKLU  
    break; iCoX& "lb  
   } "tZe>>I  
  } e.%nRhSs3  
 } 8|^7ai[am  
 return bRemoved; WxDh;*am:  
} AX INThJ  
]|@^1we  
void VerifyWindow() l]vm=7:  
{ _aphkeqd  
 for(int i=0;i<MAX_KEY;i++){ xk5 ]^yDp  
  if(hCallWnd!=NULL){ _{>vTBU4F  
   if(!IsWindow(hCallWnd)){ wL1MENzp*z  
    hCallWnd=NULL; 4| f*eO  
    HotKey=0; Y2TtY;  
    HotKeyMask=0; ,6/V" kqIP  
    KeyCount--; TC('H[ ]  
   } ZcsZ$qt^  
  } y5r4&~04  
 } R_KH"`q  
} $qiya[&G4  
9sP0D  
BOOL CHookApp::InitInstance() #tHK"20  
{ c L]1f  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~u{uZ(~  
 hins=AfxGetInstanceHandle(); SM '|+ d  
 InitHotkey(); 0K+ne0I  
 return CWinApp::InitInstance(); do_[&  
} 3$tdwe$S  
|)&%A%m  
int CHookApp::ExitInstance() GyIV Hby  
{ #c J@uqR  
 VerifyWindow(); 7$b1<.WX  
 UnInit(); .`lCWeHN  
 return CWinApp::ExitInstance(); 6863xOv{T  
} 1oS/`)  
wY#E?,  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file R-:2HRaA  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3]>|  i  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 0sqFF[i  
#if _MSC_VER > 1000 >z03{=sAN  
#pragma once ]]mJ']l  
#endif // _MSC_VER > 1000 qM`}{ /i  
9x8fhAy}4  
class CCaptureDlg : public CDialog Q8NX)R  
{ QZs!{sZ  
 // Construction 4Ig;3 ^%71  
 public: 7/H)Az@i45  
  BOOL bTray; :h$$J lP  
  BOOL bRegistered; _w{Qtj~s|  
  BOOL RegisterHotkey(); !VJoM,b8  
  UCHAR cKey; Wzh`or  
  UCHAR cMask; ixFi{_  
  void DeleteIcon(); .8R@2c`}Cs  
  void AddIcon(); D- c4EV  
  UINT nCount; AdEMa}u 6  
  void SaveBmp(); zda 3 ,U2o  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hrn+UL:d  
  // Dialog Data P?\6@_ Z  
  //{{AFX_DATA(CCaptureDlg) @- xjfC\d  
  enum { IDD = IDD_CAPTURE_DIALOG }; ^ y::jK  
  CComboBox m_Key; G2D$aSh  
  BOOL m_bControl; ,hVli/  
  BOOL m_bAlt; x4 yR8n(  
  BOOL m_bShift; pb}*\/s  
  CString m_Path; \bcLiKE{  
  CString m_Number; KwS@D9bok  
  //}}AFX_DATA tc! #wd+u  
  // ClassWizard generated virtual function overrides uYN`:b8  
  //{{AFX_VIRTUAL(CCaptureDlg) WLT"ji0w2  
 public: *VcJ= b 2Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); *p U x8yB  
 protected: | (93gJ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vQCy\Gi   
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }j%5t ~Qa  
  //}}AFX_VIRTUAL XZ7Lk)IR  
  // Implementation "x-j~u?  
 protected: TDh5lI  
  HICON m_hIcon; N['  .BN  
  // Generated message map functions tA;}h7/Lc~  
  //{{AFX_MSG(CCaptureDlg) ;`&kZi60Hz  
  virtual BOOL OnInitDialog(); 3n _htgcv  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); siI;"?  
  afx_msg void OnPaint(); Upe%rC(  
  afx_msg HCURSOR OnQueryDragIcon(); u_enqC3  
  virtual void OnCancel(); ?  t|[?  
  afx_msg void OnAbout(); QV!up^Zso  
  afx_msg void OnBrowse(); 2ESo2  
  afx_msg void OnChange(); ]DcFySyv  
 //}}AFX_MSG HtFDlvdy]  
 DECLARE_MESSAGE_MAP() $Yq9P0Ya  
}; aOp\91  
#endif wT@og|M  
icgfB-1|i  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file b9krOe *j  
#include "stdafx.h" S'" Df5  
#include "Capture.h" 6Oq 7#3]  
#include "CaptureDlg.h" UNYqft4  
#include <windowsx.h> #e"[^_C@!  
#pragma comment(lib,"hook.lib") "sTRS*  
#ifdef _DEBUG )8AXm  
#define new DEBUG_NEW @]j1:PN-  
#undef THIS_FILE A"]YM'.  
static char THIS_FILE[] = __FILE__; f#;>g  
#endif .nJz G  
#define IDM_SHELL WM_USER+1 ;pAK_>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >7|VR:U?B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Ac@VGT:9  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s[jTP(d)8  
class CAboutDlg : public CDialog jp,4h4C^)  
{ K0~rN.C!0  
 public: 9w"*y#_  
  CAboutDlg(); OXA7w.^  
  // Dialog Data *wearCPeJ  
  //{{AFX_DATA(CAboutDlg) dN q$}  
  enum { IDD = IDD_ABOUTBOX }; h{Y",7] !  
  //}}AFX_DATA N7"W{"3D  
  // ClassWizard generated virtual function overrides h`q1  
  //{{AFX_VIRTUAL(CAboutDlg) 7#Ft|5$~q  
 protected: tw;}jh  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1Mzmg[L8  
  //}}AFX_VIRTUAL 'L'R9&o<X  
  // Implementation 5! {D!  
 protected: 6Mf0`K  
  //{{AFX_MSG(CAboutDlg)  ?9/G[[(  
  //}}AFX_MSG o&%g8=n%  
  DECLARE_MESSAGE_MAP() .*oU]N%K=  
}; i5Ggf"![  
e ,(mR+a8  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) **%37  
{ kVgTGC"L=  
 //{{AFX_DATA_INIT(CAboutDlg) "jZ-,P=  
 //}}AFX_DATA_INIT .#gzP2 [q  
} V gWRW7Se  
^q5#ihM  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) XS#Qu=,-  
{ !L(^(;$Kgr  
 CDialog::DoDataExchange(pDX); C dn J&N{  
 //{{AFX_DATA_MAP(CAboutDlg) u 9e@a9c  
 //}}AFX_DATA_MAP Y2AJ+ |  
} [n@] r2g)3  
u`W2 +S  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) SUiOJ[5,  
 //{{AFX_MSG_MAP(CAboutDlg) >:-$+I  
 // No message handlers (`^1Y3&2  
 //}}AFX_MSG_MAP 04ui`-c(  
END_MESSAGE_MAP() X ?O[r3<  
XFl 6M~ c  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) dO'(2J8  
: CDialog(CCaptureDlg::IDD, pParent) {: /}NpA$  
{ ?uu*L6  
 //{{AFX_DATA_INIT(CCaptureDlg) ?<!|  
  m_bControl = FALSE; oH@78D0A  
  m_bAlt = FALSE; Nn6%9PX_)  
  m_bShift = FALSE; kiEa<-]  
  m_Path = _T("c:\\"); e~OpofJNb  
  m_Number = _T("0 picture captured."); 2y4bwi  
  nCount=0; *dQSw)R  
  bRegistered=FALSE; 5pX6t  
  bTray=FALSE; f*Hr^b}`8  
 //}}AFX_DATA_INIT z{ dEC %  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &C}*w2]0S  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); =_CzH(=f#  
} rq{$,/6.  
}BEB1Q}L  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )0`C@um  
{ 81F9uM0  
 CDialog::DoDataExchange(pDX); vM={V$D&  
 //{{AFX_DATA_MAP(CCaptureDlg) e\rp)[>'  
  DDX_Control(pDX, IDC_KEY, m_Key); Rq-ZL{LR7  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -"x$ZnHU  
  DDX_Check(pDX, IDC_ALT, m_bAlt); E .h*g8bXe  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0GwR~Z}Z  
  DDX_Text(pDX, IDC_PATH, m_Path); 43cE`9~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ).O)p9  
 //}}AFX_DATA_MAP KNl$3nX  
} 0GLM(JmK  
"]*tLL:`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0-gAyiKx?  
//{{AFX_MSG_MAP(CCaptureDlg) @7 }W=HB  
 ON_WM_SYSCOMMAND() >P(.:_ ^p  
 ON_WM_PAINT() Uo49*Mr  
 ON_WM_QUERYDRAGICON() ?,/ }`3Vw  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) (3e 2c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kJU2C=m@e2  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  " bG2:  
//}}AFX_MSG_MAP PT ~D",k  
END_MESSAGE_MAP() G@0&8  
sO Y:e/_F  
BOOL CCaptureDlg::OnInitDialog() +@UV?"d  
{ 42{~Lhxt  
 CDialog::OnInitDialog(); (FV >m  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (7Qo  
 ASSERT(IDM_ABOUTBOX < 0xF000); hH.G#-JO  
 CMenu* pSysMenu = GetSystemMenu(FALSE); BtZyn7a  
 if (pSysMenu != NULL) GgU/ !@  
 { g(g& TO  
  CString strAboutMenu; [g,}gyeS(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \V:^h [ad  
  if (!strAboutMenu.IsEmpty()) z?zL97H  
  { >_} I.\ X  
   pSysMenu->AppendMenu(MF_SEPARATOR); }H2 R3icE  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); qs6aB0ln  
  } 3|7QU ld  
 } %<5'=t'|-U  
 SetIcon(m_hIcon, TRUE); // Set big icon 4i bc  
 SetIcon(m_hIcon, FALSE); // Set small icon xw%0>K[  
 m_Key.SetCurSel(0); 7)m9"InDI  
 RegisterHotkey(); 1C.VnzRnJ  
 CMenu* pMenu=GetSystemMenu(FALSE); !>tL6+yj  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); d9ihhqq3}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Bvj0^fSm  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 2%1hdA<  
 return TRUE; // return TRUE unless you set the focus to a control rqq1TRg  
} )u">it+  
*hrd5na  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +\'t E~V  
{ L];b< *d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [aS*%Heu  
 { X&zis1A<  
  CAboutDlg dlgAbout; E`q_bn  
  dlgAbout.DoModal(); YIE<pX4Q7)  
 } 9uY'E'm*  
 else :gT4K-O j  
 { 6~{C.No}  
  CDialog::OnSysCommand(nID, lParam); zDp2g)  
 } Z)!C'cb  
} J4utIGF  
:N@^?q{b  
void CCaptureDlg::OnPaint() B!yr!DWv  
{ 3T 9j@N77  
 if (IsIconic()) -&f$GUTJ  
 { |{;G2G1[  
  CPaintDC dc(this); // device context for painting q4q6c")zp  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); VQI 3G  
  // Center icon in client rectangle K,]=6 Rj  
  int cxIcon = GetSystemMetrics(SM_CXICON); N [@?gFtT  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?"FbsMk.d  
  CRect rect; l%ZhA=TKQ  
  GetClientRect(&rect); mmsPLv6  
  int x = (rect.Width() - cxIcon + 1) / 2; wBzC5T%,  
  int y = (rect.Height() - cyIcon + 1) / 2; 67TwPvh  
  // Draw the icon fVwU e _Y  
  dc.DrawIcon(x, y, m_hIcon); f::Dx1VcX  
 } 'yth'[  
 else B *vM0  
 { $(9U@N9E  
  CDialog::OnPaint(); !W0v >p  
 } \ jA~9  
} +"(jjxJm  
!BI;C(,RL  
HCURSOR CCaptureDlg::OnQueryDragIcon() /(T?j!nPE  
{ S'14hk<  
 return (HCURSOR) m_hIcon; Qd6FH2Pl  
} WHI`/FM  
=xrv~  
void CCaptureDlg::OnCancel() E9}C  #  
{ zQA`/&=Y  
 if(bTray) H"KCK6  
  DeleteIcon(); OB7hlW  
  CDialog::OnCancel(); r>\bW)e  
} '|4!5)/K  
2tLJU  Z1  
void CCaptureDlg::OnAbout() eQ"E   
{ hcc/=_hA  
 CAboutDlg dlg; _U0f=m  
 dlg.DoModal(); "ta x?  
} R3! t$5HG  
jal-9NV)!  
void CCaptureDlg::OnBrowse() HThcn1u~^b  
{ J;%Xfx]  
 CString str; _|]x2xb)  
 BROWSEINFO bi; m,S{p<-h  
 char name[MAX_PATH]; .B yuN  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2%> FR4a  
 bi.hwndOwner=GetSafeHwnd(); j9,P/K$:w  
 bi.pszDisplayName=name; K#xv u1U  
 bi.lpszTitle="Select folder"; 6#yUc_5 \  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; j4b4!^fV  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); AEuG v}#  
 if(idl==NULL) )i<j XZ:O  
  return; eq"]%s  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); S$k&vc(0  
 str.ReleaseBuffer(); [2koe.?(  
 m_Path=str; b2]Kx&!  
 if(str.GetAt(str.GetLength()-1)!='\\') PX99uWx5]  
  m_Path+="\\"; qNr} \J|  
 UpdateData(FALSE); {U1m.30n  
} XM}hUJJW  
l]cFqL p  
void CCaptureDlg::SaveBmp() to\N i~a&  
{ CJ%I51F`X  
 CDC dc;  9a kH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); x:7IIvP  
 CBitmap bm; 8D].MI^  
 int Width=GetSystemMetrics(SM_CXSCREEN); bi:8(Q$w:`  
 int Height=GetSystemMetrics(SM_CYSCREEN); iOdpM{~*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); fQ98(+6  
 CDC tdc; Th[dW<  
 tdc.CreateCompatibleDC(&dc); d"NLE'R  
 CBitmap*pOld=tdc.SelectObject(&bm); _FEF x  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Nluoqo ac  
 tdc.SelectObject(pOld); X@f}Q`{Ymj  
 BITMAP btm; |%v^W3  
 bm.GetBitmap(&btm); 6 r_)sHf  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; mqJ_W[y7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); -![|}pX  
 BITMAPINFOHEADER bih; +*^H#|!  
 bih.biBitCount=btm.bmBitsPixel; }-fl$j?9E  
 bih.biClrImportant=0; b6M  
 bih.biClrUsed=0; *' X3z@R  
 bih.biCompression=0; Jo}eeJ;k  
 bih.biHeight=btm.bmHeight; vFsLY  
 bih.biPlanes=1; o14cwb  
 bih.biSize=sizeof(BITMAPINFOHEADER); 4OX^(  
 bih.biSizeImage=size; o Rzi>rr  
 bih.biWidth=btm.bmWidth; c|1&lYal;  
 bih.biXPelsPerMeter=0; |)81Lz  
 bih.biYPelsPerMeter=0; {iLT/i%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); s{" 2L{,$  
 static int filecount=0; VD:/PL  
 CString name; X7 w Ky(g  
 name.Format("pict%04d.bmp",filecount++); O~QB!<Q+  
 name=m_Path+name; `XB 9Mi=  
 BITMAPFILEHEADER bfh; 05k0n E  
 bfh.bfReserved1=bfh.bfReserved2=0; $A` VYJtt#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); fX+O[j  
 bfh.bfSize=54+size; H.2QKws^F  
 bfh.bfOffBits=54; Dxxm="FQZ  
 CFile bf; @A 5?3(e  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ T^v}mWCZ  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); >*n0n!vF  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1QJL .  
  bf.WriteHuge(lpData,size); gO^gxJ'0t  
  bf.Close(); =ruao'A  
  nCount++; 9C \Fq-  
 } /=, nGk>  
 GlobalFreePtr(lpData); "vslZ`RU  
 if(nCount==1) Q|L~=9  
  m_Number.Format("%d picture captured.",nCount); %#}Zy   
 else qv"$Bd:]r  
  m_Number.Format("%d pictures captured.",nCount); o lxByzTh>  
  UpdateData(FALSE); B]$GSEB  
} <|\Lm20 G]  
+]50DxflA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) IMfqiH)  
{ )/EO&F  
 if(pMsg -> message == WM_KEYDOWN) 'ah[(F<*@e  
 { x=jK:3BF  
  if(pMsg -> wParam == VK_ESCAPE) ""D 4s  
   return TRUE; F/A|(AH'  
  if(pMsg -> wParam == VK_RETURN) Ow077v ?  
   return TRUE; 9E6R0D}  
 } pD74+/DD  
 return CDialog::PreTranslateMessage(pMsg); Bnd [X  
} 9I/N4sou  
w\brVnt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) t_suF$  
{ Ki~1qu:  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ j w9b )  
  SaveBmp(); \j)E 5b+  
  return FALSE; I9Fr5p-%O  
} $j?1g#  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~!3r&(  
 CMenu pop; So 5N5,u@=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); PY0j 9$i?  
 CMenu*pMenu=pop.GetSubMenu(0); o+9j?|M  
 pMenu->SetDefaultItem(ID_EXITICON); [=_jYzD,j|  
 CPoint pt; 6u}</>}  
 GetCursorPos(&pt); r)6M!_]AW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z`BK/:vo3H  
 if(id==ID_EXITICON) %!L9)(}"  
  DeleteIcon(); Ib0ZjX6  
 else if(id==ID_EXIT) nJLFfXWx  
  OnCancel(); KK%M~Y+tU'  
 return FALSE; TBrPf-Xr  
} Fr$5RAyg  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (@}!0[[^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V#}kwON  
 AddIcon(); 6Kb1~jY  
 return res; jb;hcraR  
} tdaL/rRe  
y#$CMf -q^  
void CCaptureDlg::AddIcon() e NafpK  
{ R^e.s -  
 NOTIFYICONDATA data; s|B3~Q]  
 data.cbSize=sizeof(NOTIFYICONDATA); HX{`Vah E  
 CString tip; w8D"CwS1Rx  
 tip.LoadString(IDS_ICONTIP); A_#DJJMm  
 data.hIcon=GetIcon(0); lUiL\~Gq  
 data.hWnd=GetSafeHwnd(); /[>sf[X\I9  
 strcpy(data.szTip,tip); T${Q.zHY[!  
 data.uCallbackMessage=IDM_SHELL;  50C   
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ]]juN  
 data.uID=98; @Pzu^  
 Shell_NotifyIcon(NIM_ADD,&data); -[DOe?T  
 ShowWindow(SW_HIDE); "v4B5:bmqW  
 bTray=TRUE; 5Zva:  
} bNoW?8bZ  
z%LIX^q9  
void CCaptureDlg::DeleteIcon() HgkC~'  
{ 5lT*hF  
 NOTIFYICONDATA data; 4X(H ;  
 data.cbSize=sizeof(NOTIFYICONDATA); C C^'@~)?  
 data.hWnd=GetSafeHwnd(); }Ys >(w  
 data.uID=98; AZ}Xj>=  
 Shell_NotifyIcon(NIM_DELETE,&data); Bn g@-#`/  
 ShowWindow(SW_SHOW); d$AWu{y  
 SetForegroundWindow(); 5-xX8-ElYz  
 ShowWindow(SW_SHOWNORMAL); E1U",CMU  
 bTray=FALSE; mS~kJy_-  
} /_#q@r4ZQ  
6qd\)q6T&x  
void CCaptureDlg::OnChange() G<^{&E+=  
{ MO <3"@/,  
 RegisterHotkey(); NS6:yX,/  
} AlW66YAuQ  
9lDhIqx0~  
BOOL CCaptureDlg::RegisterHotkey() = +?7''{>  
{ 9v!1V,`j"  
 UpdateData(); ^Zy% fv,  
 UCHAR mask=0; y {<9]'  
 UCHAR key=0; S +^E.  
 if(m_bControl) (41|'eB\\  
  mask|=4; ^4Ah_ U  
 if(m_bAlt) 9Ly]DZ;L  
  mask|=2; qH6>!=00  
 if(m_bShift) L4|`;WP  
  mask|=1; \<6CZ  
  key=Key_Table[m_Key.GetCurSel()]; usL* x9i  
 if(bRegistered){ f[^Aw(o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 84pFc;<  
  bRegistered=FALSE; =+MPFhvg!  
 } .JiziFJ@mj  
 cMask=mask; Y~E`9  
 cKey=key; 3% ;a)c;D  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ([LSsZ]sj  
 return bRegistered; 4u47D$=  
} ;K &o-y  
5=?\1`e1[  
  四、小结 o"BoZsMk  
WYYa /,{9.  
  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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