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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: 'V{k$}P2  
  ;lt;]7  
  一、实现方法 j[eEyCW[)  
b,A1(_pzi  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: a5S/ O;ry  
!{0!G  
#pragma data_seg("shareddata") |hyr(7  
HHOOK hHook =NULL; //钩子句柄 hfc!M2/w  
UINT nHookCount =0; //挂接的程序数目 @Ec9Do>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 P &._ -[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 daNIP1Qn  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey /;ITnG  
static int KeyCount =0; "Y0[rSz,UW  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |0%UM}  
#pragma data_seg() Jxp'.oo[  
!XC7F UO  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ?P]md9$(+e  
,i.P= o  
  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: 5!%/j,?  
C#0Wo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR '2#fkH[.  
cKey,UCHAR cMask) >>xV-1h:  
{ #nhAW  
 BOOL bAdded=FALSE; ^;_b!7*  
 for(int index=0;index<MAX_KEY;index++){ o%5Ao?z~  
  if(hCallWnd[index]==0){ &|;!St]!M  
   hCallWnd[index]=hWnd; GTe9@d  
   HotKey[index]=cKey; %;J`dM  
   HotKeyMask[index]=cMask; DF =. G1  
   bAdded=TRUE; wQ.zj`?$(  
   KeyCount++; Zt=X %M|aw  
   break; 9q{dRS[A  
  } Cu7iHhY5  
 } 5xKR ]u  
 return bAdded; *?'T8yf^  
} B9-=.2.WU  
//删除热键 s[bKGn@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9] \vw  
{ 5+Ut]AL5  
 BOOL bRemoved=FALSE; n|6yz[N  
 for(int index=0;index<MAX_KEY;index++){ K.7gd1I  
  if(hCallWnd[index]==hWnd){ u] b6>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;_ton?bF  
    hCallWnd[index]=NULL; _v,n~a}&  
    HotKey[index]=0; P.7B]&T6  
    HotKeyMask[index]=0; lU& IS?^?  
    bRemoved=TRUE; eu;^h3u;b  
    KeyCount--; Q4*cL5j  
    break; t|lv6-Hy9  
   } 5. i;IOx  
  } bcNYoZ8`  
 } F6/bq/s  
 return bRemoved; z{x -Vfd  
} v~3q4P  
NKrk*I"G  
&aOOG8l  
  DLL中的钩子函数如下: )-oNy-YL  
Sm5"Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ZAwl,N){  
{ w@We,FUJN  
 BOOL bProcessed=FALSE; z_TK (;j  
 if(HC_ACTION==nCode) yfrgYA  
 { 8%Lg)hvl  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 N~(}?'y9S  
   switch(wParam) g9JtWgu  
   {  tWuQKN`_  
    case VK_MENU: qE[}Cf]X  
     MaskBits&=~ALTBIT; $Izk]o;X~  
     break; _De;SB %V  
    case VK_CONTROL: hZy*E[i  
     MaskBits&=~CTRLBIT; = '[@UVH(Z  
     break; 5KzU&!Zh9  
    case VK_SHIFT: k,,}N 9  
     MaskBits&=~SHIFTBIT; 3*<W`yed  
     break; !;-x]_  
    default: //judge the key and send message Pmb`05\  
     break; S"l&=J2dc  
   } teb(\% ,  
   for(int index=0;index<MAX_KEY;index++){  VM`."un]  
    if(hCallWnd[index]==NULL)  f63q  
     continue; KtE`L4tW6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C{-pVuhK+  
    { 3@PVUJ0B|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Kt(p|  
     bProcessed=TRUE; z,WrLZC  
    } paY%pU  
   } |u[gI+TUE  
  } Aj_}B.  
  else if((lParam&0xc000ffff)==1){ //有键按下 aUV>O`|_  
   switch(wParam) \JchcQ  
   { n$QFj'  
    case VK_MENU: (TPD!=  
     MaskBits|=ALTBIT; Bb)J8,LQ  
     break; n)yqb  
    case VK_CONTROL: ,7aqrg  
     MaskBits|=CTRLBIT; _C?K;-v}  
     break; ]@EjKgs  
    case VK_SHIFT: U,N4+F}FR  
     MaskBits|=SHIFTBIT; [}D)73h`  
     break; eYFCf;  
    default: //judge the key and send message &oBJY'1  
     break; r\zK>GVm_  
   } P+xZaf H  
   for(int index=0;index<MAX_KEY;index++){ jp|wc,]!  
    if(hCallWnd[index]==NULL) ^H'#*b0u  
     continue; K^+B"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q5ux**(Wr  
    { (@ Bw@9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 9Bn dbS i  
     bProcessed=TRUE; 7">.{ @S  
    } x =k$^V~  
   } Dqki}k~{  
  } p\ASf  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 -Ac^#/[0  
   for(int index=0;index<MAX_KEY;index++){ H={,zZ11{  
    if(hCallWnd[index]==NULL) r?$\`,;  
     continue; &nq[Vy0kO4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +x1sV*S  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kDrGl{U}  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 <mxUgU  
   } LxbVRw  
  } F]&9Lp} "  
 }  F#hM S<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _+U`afV  
} Pdv&X*KA  
xnArYm  
  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: /cg!Ap5  
xucV$[f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5HB4B <2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); D4G{= Y}G  
C9fJLCufC  
  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: 3jQ |C=   
I^o^@C  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) uzS57 O%  
{ *ULXJZ%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) lm+wjhkN  
 { _ &T$0SZco  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ,{%[/#~6  
  SaveBmp(); `hbM 2cM  
  return FALSE; N7[~Y2i  
 } &CS=*)>$  
 …… //其它处理及默认处理 \"Np'$4eu  
} P?I"y,_ p  
Y{jhT^tKK  
uJ%ql5XDV  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 V/03m3!q  
>uVG]  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 F$caKWzny5  
__a9}m4i7x  
  二、编程步骤 7':|f"  
4:K9FqU  
  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"; -+z^{*\; N  
GK)hK-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]UNmhF!W>u  
2Bx\nLf/ K  
  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; Q<M>+U;t  
u}pLO9V"`  
  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; 4|~o<t8  
(|WqOwmoUt  
  5、 添加代码,编译运行程序。 8.vD]hO  
my Po&"_ x  
三、程序代码 uQ{M<%K  
(h E^<jNR  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL v"^G9u  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) [[Z*n/tr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ F: \CDM=lS  
#if _MSC_VER > 1000 >BiJ/[9  
#pragma once 5nk]{ G> V  
#endif // _MSC_VER > 1000 H#f FU  
#ifndef __AFXWIN_H__ ,i'>+Ix<  
#error include 'stdafx.h' before including this file for PCH ?O28Q DUI  
#endif kw!! 5U;7  
#include "resource.h" // main symbols V%"aU}   
class CHookApp : public CWinApp }^=J]  
{ d hh`o\$  
 public: #zfBNkk&@  
  CHookApp(); &n['#7 <(!  
  // Overrides q$\KE4v"  
  // ClassWizard generated virtual function overrides 7r:!HmRl  
  //{{AFX_VIRTUAL(CHookApp) ?(E$|A  
 public: /: B!hvpw  
  virtual BOOL InitInstance(); >2%!=q3)  
  virtual int ExitInstance(); SlmgFk!r!  
  //}}AFX_VIRTUAL Z5v\[i@H!  
  //{{AFX_MSG(CHookApp) 1B2>8 N  
  // NOTE - the ClassWizard will add and remove member functions here. #HqXC\~n  
  // DO NOT EDIT what you see in these blocks of generated code ! JVN0];IL}  
  //}}AFX_MSG xgfK0-T|[  
  DECLARE_MESSAGE_MAP() 6L8wsz CW  
}; 0DGXMO$;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); T$SGf.-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -2f_e3jF  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Lb(=:Z!{  
BOOL InitHotkey(); B%[Yu3gBo  
BOOL UnInit(); F6yMk%  
#endif h/5.>[VwDh  
wPyfne?~,  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. : x W.(^(d  
#include "stdafx.h" oPl^tzO  
#include "hook.h" U4Il1| M&  
#include <windowsx.h> :Oxrw5`=  
#ifdef _DEBUG dtJ?J<m}  
#define new DEBUG_NEW {"-uaH>,  
#undef THIS_FILE yj-BLR5  
static char THIS_FILE[] = __FILE__; J#MUtpPdQ  
#endif G8j$&1`:  
#define MAX_KEY 100 H|5\c=  
#define CTRLBIT 0x04 ?3[as<GZ8  
#define ALTBIT 0x02 H}`}qu #~V  
#define SHIFTBIT 0x01 jruwdm^  
#pragma data_seg("shareddata") L2+~I<|>  
HHOOK hHook =NULL; \Gg6&:Ua  
UINT nHookCount =0; &iez{[O  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %qNT<>c  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Db@$'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey g6MK~JG$?h  
static int KeyCount =0;  BVU>M*k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift q9|'!m5K  
#pragma data_seg() `5:b=^'D /  
HINSTANCE hins; 8a)lrIg  
void VerifyWindow(); mSr(PIH{\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s>ilxLSX]  
//{{AFX_MSG_MAP(CHookApp) n2cb,b/7  
// NOTE - the ClassWizard will add and remove mapping macros here. '_>8_  
// DO NOT EDIT what you see in these blocks of generated code! ^i:%0"[*^i  
//}}AFX_MSG_MAP qi!+ Ceo}  
END_MESSAGE_MAP() D&#wn.0|E  
T@Mrbravc  
CHookApp::CHookApp() OF-$*  
{ 0F/o  
 // TODO: add construction code here, t[ cHdI  
 // Place all significant initialization in InitInstance .]24V!J(1w  
} q-}q rg  
JYc;6p$<i  
CHookApp theApp; R `  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vL}e1V:  
{ ^\KZE|^3@  
 BOOL bProcessed=FALSE; >8PGyc*9  
 if(HC_ACTION==nCode) -Q9} gaH_  
 { d0YDNP%,_  
  if((lParam&0xc0000000)==0xc0000000){// Key up muc6gwBp  
   switch(wParam) lk;4l Z  
   { m7!M stu  
    case VK_MENU: HHzAmHt  
     MaskBits&=~ALTBIT; 6fY-D qF!  
     break; `|(S]xPHM  
    case VK_CONTROL: ^Y,nv,gYn  
     MaskBits&=~CTRLBIT; W"$sN8K>)  
     break; ozB2L\D7  
    case VK_SHIFT: 9vZ:oO  
     MaskBits&=~SHIFTBIT; O%}?DiSl  
     break; ZMEU4?F  
    default: //judge the key and send message ~>SqJ&-moo  
     break; Q #IlUo  
   } x4v@o?zW  
   for(int index=0;index<MAX_KEY;index++){ fRh}n ^X  
    if(hCallWnd[index]==NULL) ZD~ra7  
     continue; -aPRL HR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |kGj}v3  
    { z[|2od  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); iC2``[m"  
     bProcessed=TRUE; -?z#  
    } )xm[mvt  
   } {#y~ Qk;T  
  } x18(}4  
  else if((lParam&0xc000ffff)==1){ //Key down 7bSj[kuN  
   switch(wParam) z>lIZ}  
   { > zA*W<g  
    case VK_MENU: mUA!GzJ~u-  
     MaskBits|=ALTBIT; rel_Z..~  
     break; h(C@IIO^;G  
    case VK_CONTROL: 4]G J+a  
     MaskBits|=CTRLBIT; FJQ=611@  
     break; !:baG]Y  
    case VK_SHIFT: *{DpNV8"  
     MaskBits|=SHIFTBIT; _TntZv.?  
     break; #;D@`.#\  
    default: //judge the key and send message '2XIeR  
     break; nEHmiG  
   } y~Z7sx0  
   for(int index=0;index<MAX_KEY;index++) R`KlG/Tk  
   { ` {/"?s|  
    if(hCallWnd[index]==NULL) qBF6LhR  
     continue; Y#[xX2z9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D,\hRQ  
    { cXw8#M!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ghGpi U$  
     bProcessed=TRUE; pF/s5z  
    } q{Ao j  
   } g>E.Snj}  
  } oZ5 ,y+L4  
  if(!bProcessed){ L9{y1'')  
   for(int index=0;index<MAX_KEY;index++){ Y[!s:3\f  
    if(hCallWnd[index]==NULL) CFXr=.yz  
     continue; |W*#N8I P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?`T Q'#P`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L8,/  
   } 0@yw#.j  
  } Q@ua G,6  
 } (1e,9!?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @)XR  
} Tm\a%Z`U>  
O@HL%ha  
BOOL InitHotkey() QpCTHpZ  
{ (}m2}  
 if(hHook!=NULL){ U0=: `G2l  
  nHookCount++; qr4.s$VGs*  
  return TRUE; 1 R,SA:L$  
 } # Rhtaq9  
 else x7GYWK 9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); p(>D5uN_}5  
  if(hHook!=NULL) s}qtM.^W  
   nHookCount++; p~WX\;   
  return (hHook!=NULL);  < v1.+  
} ~jJF&*)  
BOOL UnInit() / %1-tGh  
{ zJ)`snN|  
 if(nHookCount>1){ % oJH 6F  
  nHookCount--; ]TVc 'G;  
  return TRUE; {X 5G  
 } ra;:  
 BOOL unhooked = UnhookWindowsHookEx(hHook); &$bcB]C\3  
 if(unhooked==TRUE){ '>cZ7:  
  nHookCount=0; 068DC_  
  hHook=NULL; :.= #U  
 } XTJA"y  
 return unhooked; 8.HJoos  
} J@A^k1B  
Qe =8x7oIP  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) kho$At)V  
{ {ub'   
 BOOL bAdded=FALSE; V%'' GF   
 for(int index=0;index<MAX_KEY;index++){ L8J] X7  
  if(hCallWnd[index]==0){ Ax6zx  
   hCallWnd[index]=hWnd; O"}O~lZ[6T  
   HotKey[index]=cKey; +w?-#M#  
   HotKeyMask[index]=cMask; !t[;~`d9  
   bAdded=TRUE; qND:LP\_v  
   KeyCount++; SohNk9u[8  
   break; E|3[$?=R  
  } / hg)=p  
 } r{{5@  
 return bAdded; @6M>x=n5  
} [9d\WPLC  
):\+%v^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5?A<('2  
{ `(r0+Qx  
 BOOL bRemoved=FALSE; yU>ucuF  
 for(int index=0;index<MAX_KEY;index++){ +~EnrrT+W  
  if(hCallWnd[index]==hWnd){ ;6$W-W _  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +&r=XJ5:`p  
    hCallWnd[index]=NULL; L|8&9F\  
    HotKey[index]=0; g_@b- :$Yq  
    HotKeyMask[index]=0; 7^;-[? l  
    bRemoved=TRUE; $9h^tP'CV  
    KeyCount--; Pv|sPIIB7  
    break; ymn@1BA8J  
   } Wcbm,O4u  
  } drvz [ 9;  
 } HQSFl=Q  
 return bRemoved; \*M;W|8aB  
} O>>/2V9  
!D!"ftOm  
void VerifyWindow() mA#;6?6  
{ MP_/eC ;  
 for(int i=0;i<MAX_KEY;i++){ XZ2 ji_D  
  if(hCallWnd!=NULL){ <sn,X0W  
   if(!IsWindow(hCallWnd)){  PZY6 I  
    hCallWnd=NULL; X/bu z  
    HotKey=0; tkmzOc H  
    HotKeyMask=0; /]?e^akA  
    KeyCount--; i|0!yID0@  
   } ;Fd1:"1pP  
  } /8 y v8  
 } *TrpW?]Y&  
} J3XG?' }  
ve\@u@K^  
BOOL CHookApp::InitInstance() (Vn3g ra  
{ Q9c*I,O j  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); N/[!$B0H@  
 hins=AfxGetInstanceHandle(); nbW.x7  
 InitHotkey(); \~r_S  
 return CWinApp::InitInstance(); 8?rq{&$t  
} |n;5D,r0C  
C)~%(< D  
int CHookApp::ExitInstance() +Ht(_+To1  
{ _;R#B`9Iu  
 VerifyWindow(); TrNh,5+b  
 UnInit(); a]J>2A@-I  
 return CWinApp::ExitInstance(); !}5+hj!6  
} Vh^ :.y   
qoZe<jW (  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 2V~uPZ  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) m {&lU@uL  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ vs>Pd |p;  
#if _MSC_VER > 1000 _bRgr  
#pragma once a5(9~. 9  
#endif // _MSC_VER > 1000 Z{gDEo)  
|WNI[49  
class CCaptureDlg : public CDialog F$'po#  
{ %q.5; L  
 // Construction |[p]]) o  
 public: A8k $.E  
  BOOL bTray; M,cz7,  
  BOOL bRegistered; IR?nH`V  
  BOOL RegisterHotkey(); >QPCYo<E  
  UCHAR cKey;  C~^T=IP  
  UCHAR cMask; 2Ima15^+F  
  void DeleteIcon(); nGsFt.  
  void AddIcon(); JE#H&]  
  UINT nCount; ^F- 2tc  
  void SaveBmp(); .J=QWfqt  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Bat@  
  // Dialog Data >;#rK@*&  
  //{{AFX_DATA(CCaptureDlg) Y5P9z{X=  
  enum { IDD = IDD_CAPTURE_DIALOG }; ftQ;$@  
  CComboBox m_Key; HG)$ W  
  BOOL m_bControl; 'Hgk$Im+  
  BOOL m_bAlt; /`t}5U>S_  
  BOOL m_bShift; 0X$2~jV>  
  CString m_Path; :H#D4O8UiH  
  CString m_Number; >[~`rOU*|Y  
  //}}AFX_DATA ztAC3,r]  
  // ClassWizard generated virtual function overrides BqpJvRJd  
  //{{AFX_VIRTUAL(CCaptureDlg) L=.@hs  
 public: 6G(K8Q{>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); p@h<u!rL8  
 protected: @LY[kt6o  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lv~ga2>z  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); mRt/ d  
  //}}AFX_VIRTUAL :fUNc^\2  
  // Implementation U lCw{:#F  
 protected: Nr}O6IJ>Sg  
  HICON m_hIcon; xZ* B}O{{H  
  // Generated message map functions ] VEc9?  
  //{{AFX_MSG(CCaptureDlg) 4q?R3 \e;  
  virtual BOOL OnInitDialog(); ?kRx;S+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); tOZ-]>U  
  afx_msg void OnPaint(); P)~olrf  
  afx_msg HCURSOR OnQueryDragIcon(); YS<KyTb"  
  virtual void OnCancel(); 7UqDPEXU]`  
  afx_msg void OnAbout(); N/1xc1$SB  
  afx_msg void OnBrowse(); NCYOY  
  afx_msg void OnChange(); vst;G-ys  
 //}}AFX_MSG e`+ej-o,  
 DECLARE_MESSAGE_MAP() `Gx 5=Bm;  
}; |oQhtk8.  
#endif m 0Uu2Z4  
p^Z|$aZZ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 9H53H"5q  
#include "stdafx.h" VMS3Q)Ul  
#include "Capture.h" A;e"_$yt8  
#include "CaptureDlg.h" `=kiqF2P}  
#include <windowsx.h> I]cZcx,<q  
#pragma comment(lib,"hook.lib") l[<o t9P[  
#ifdef _DEBUG l*Fp}d.  
#define new DEBUG_NEW {bC(>k|CQ  
#undef THIS_FILE fP- =wd  
static char THIS_FILE[] = __FILE__; .Q{VY]B^  
#endif uLfk>&hc  
#define IDM_SHELL WM_USER+1 FuAs$;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K;`W4:,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -zZb]8\E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; x]608I T  
class CAboutDlg : public CDialog 5 o[E8c 8  
{ Zeq^dV5y77  
 public: \Hq=_}]F  
  CAboutDlg(); ^* CKx  
  // Dialog Data p  S|  
  //{{AFX_DATA(CAboutDlg) Xi~I<&  
  enum { IDD = IDD_ABOUTBOX }; w}M)]kY  
  //}}AFX_DATA K.}jyhKIKi  
  // ClassWizard generated virtual function overrides 4tvZJS hV  
  //{{AFX_VIRTUAL(CAboutDlg) i&<@}:,  
 protected: ] pv!Ll  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]4'V59\  
  //}}AFX_VIRTUAL IU"n`HS  
  // Implementation f1B t6|W%  
 protected: dIA1\;@  
  //{{AFX_MSG(CAboutDlg) [(vV45(E  
  //}}AFX_MSG NFG~PZ`6R  
  DECLARE_MESSAGE_MAP() q9\(<<f|  
}; :3b\pEO9\  
Ax9A-|  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1M?Sl?+j  
{ 76u\# {5  
 //{{AFX_DATA_INIT(CAboutDlg) dV^ck+  
 //}}AFX_DATA_INIT j*~z.Q|  
} oHF,k  
4F!%mMq  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <2LUq@Pg  
{ > lI2r}  
 CDialog::DoDataExchange(pDX); /8,cF7XL*  
 //{{AFX_DATA_MAP(CAboutDlg) II\}84U2 .  
 //}}AFX_DATA_MAP ?9T,sX:  
} :#UA!| nV  
M?DXCsZ,)s  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $_|jI ^  
 //{{AFX_MSG_MAP(CAboutDlg) n8q%>.i7  
 // No message handlers Z5*O\kJv  
 //}}AFX_MSG_MAP   [ L  
END_MESSAGE_MAP() =A_{U(>  
7p {2&YhB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qy-Hv6oof  
: CDialog(CCaptureDlg::IDD, pParent) LX(`@-<DH  
{ 20M]gw]  
 //{{AFX_DATA_INIT(CCaptureDlg) cA{,2CYc  
  m_bControl = FALSE; `0=j,54cx  
  m_bAlt = FALSE; N*KM6j  
  m_bShift = FALSE; " "CNw-^t  
  m_Path = _T("c:\\"); u~Y+YzCxV  
  m_Number = _T("0 picture captured."); V9;IH<s:  
  nCount=0; Vp8!-[R  
  bRegistered=FALSE; jk])S~xl?  
  bTray=FALSE; K~qKr<)  
 //}}AFX_DATA_INIT w3Dqpo8E  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 0{stIgB$  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g&/r =U  
} V|4k=_-  
9 vNz yh\  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) o<g1;  
{ Wa iM\h?=#  
 CDialog::DoDataExchange(pDX); & 5'cN  
 //{{AFX_DATA_MAP(CCaptureDlg) /vqsp0e"H  
  DDX_Control(pDX, IDC_KEY, m_Key); 3B4C@ {  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Qs 'dwc  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,!98V Jmr  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); OV-#8RXJ  
  DDX_Text(pDX, IDC_PATH, m_Path); K48 QkZ_gY  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h 3p~\%^  
 //}}AFX_DATA_MAP 8>:u%+ C1c  
} rWp+kV[Ec>  
jVSU]LU E  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) h~#.s*0.F  
//{{AFX_MSG_MAP(CCaptureDlg) Hc\oR(L  
 ON_WM_SYSCOMMAND() irn }.e  
 ON_WM_PAINT() -)e(Qt#ewl  
 ON_WM_QUERYDRAGICON() %,udZyO3uR  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) WwLV^m]  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &Z+.FTo  
 ON_BN_CLICKED(ID_CHANGE, OnChange) NDG?X s [2  
//}}AFX_MSG_MAP "ZG2olOqLI  
END_MESSAGE_MAP() [t]q#+Zs  
Jx8DVjy  
BOOL CCaptureDlg::OnInitDialog() Z}>+!Z  
{ )2b bG4:N  
 CDialog::OnInitDialog(); >UV=k :Q  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B\>3[_n  
 ASSERT(IDM_ABOUTBOX < 0xF000); _9z+xl  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Fz]!2rt  
 if (pSysMenu != NULL) M:%Ll3  
 { %z["TVH  
  CString strAboutMenu; _D1)_?`a@-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); sP%J`L@h  
  if (!strAboutMenu.IsEmpty()) 02po;  
  { 9}11>X  
   pSysMenu->AppendMenu(MF_SEPARATOR); pF:C   
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (9+N_dLx~P  
  } J 77*Ue ^  
 } Bh6lK}9  
 SetIcon(m_hIcon, TRUE); // Set big icon .U,>Qn4/  
 SetIcon(m_hIcon, FALSE); // Set small icon eie u|_  
 m_Key.SetCurSel(0); ZIaFvm&q7Z  
 RegisterHotkey(); ?M04 cvm  
 CMenu* pMenu=GetSystemMenu(FALSE); :a M@"#F  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); nY?X@avo>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); V`LW~P;  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); m8&XW2S  
 return TRUE; // return TRUE unless you set the focus to a control AKAxfnaR  
} SXmh@a"*\  
K(}<L-cv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .u;'eVH)a}  
{ ^I!gteU;  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) t\lx*_lr  
 { / gE9 W  
  CAboutDlg dlgAbout;  w1t0X{  
  dlgAbout.DoModal(); `R o>?H  
 } bpfSe  
 else uF]+i^+  
 { T`)uR*$  
  CDialog::OnSysCommand(nID, lParam); ~VJP:Y{[  
 } rB3b  
} B zr}+J  
58/\  
void CCaptureDlg::OnPaint() Y\{lQMCy  
{ 7 6S>xnN  
 if (IsIconic()) rXnG"A  
 { GC~N$!*  
  CPaintDC dc(this); // device context for painting ,CnUQx0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /Pa<I^-#  
  // Center icon in client rectangle 90+Hv:wF  
  int cxIcon = GetSystemMetrics(SM_CXICON); Jv:|J DZ'  
  int cyIcon = GetSystemMetrics(SM_CYICON); - o sxKT:  
  CRect rect; J i:0J},m  
  GetClientRect(&rect); }/Y)^  
  int x = (rect.Width() - cxIcon + 1) / 2; %gXNWxv  
  int y = (rect.Height() - cyIcon + 1) / 2; Y ^uYc}  
  // Draw the icon 8j!(*'J.  
  dc.DrawIcon(x, y, m_hIcon); p9iCrqi  
 } _ 4+=S)$  
 else ]\:l><  
 { PX,fg5s\b  
  CDialog::OnPaint(); "yxBD 7  
 } e irRAU  
} n/GJ&qLi:g  
 %L gfi  
HCURSOR CCaptureDlg::OnQueryDragIcon() s B!2't  
{ w3peG^4D_  
 return (HCURSOR) m_hIcon; h3kBNBI )  
} $a+)v#?,  
x8* @<]!  
void CCaptureDlg::OnCancel() & A@ !g  
{ m{sch`bP  
 if(bTray) =_H)5I_\  
  DeleteIcon(); .#ATI<t  
  CDialog::OnCancel(); .t9zF-jk  
} n!y}p q6  
9i#K{CkC|  
void CCaptureDlg::OnAbout() -X#qW"92q  
{ 6c&OR2HGqO  
 CAboutDlg dlg; n0kkUc-`   
 dlg.DoModal(); FI(M 1iJ  
} U>_#,j  
9:6d,^X  
void CCaptureDlg::OnBrowse() *gXm&/2*  
{ 7S9Q{  
 CString str; XvW $B|  
 BROWSEINFO bi; 7q:  
 char name[MAX_PATH]; NbW5a3=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); <(-4?"1  
 bi.hwndOwner=GetSafeHwnd(); 9 !qVYU42(  
 bi.pszDisplayName=name; ^o*$+DbC  
 bi.lpszTitle="Select folder"; zs@[!?A,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; d@t3C8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $~*d.  
 if(idl==NULL) L\asrdL?=  
  return; "n=Ih_J  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Gu9x4p  
 str.ReleaseBuffer(); )d-{#  
 m_Path=str; -2Azpeh  
 if(str.GetAt(str.GetLength()-1)!='\\') pGGx.&5#82  
  m_Path+="\\"; >~^##bIb  
 UpdateData(FALSE); W4(O2RU  
} z?8Sie  
}\/f~ ?tEh  
void CCaptureDlg::SaveBmp() yw)Ztg)  
{ |1(9_=i'  
 CDC dc; j>OB<4?.+  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); /I&b5Vp  
 CBitmap bm; =Z(#j5TGvH  
 int Width=GetSystemMetrics(SM_CXSCREEN); Bh,LJawE  
 int Height=GetSystemMetrics(SM_CYSCREEN); tC -H2@  
 bm.CreateCompatibleBitmap(&dc,Width,Height); da&f0m U  
 CDC tdc; lb('=]3 }H  
 tdc.CreateCompatibleDC(&dc); i<Be)Y-'  
 CBitmap*pOld=tdc.SelectObject(&bm); T"m(V/L$W  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); F I\V6\B/  
 tdc.SelectObject(pOld); VG`A* Vj  
 BITMAP btm; >zDnJb&"&  
 bm.GetBitmap(&btm); tY=n("=2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 3M&75OE  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 2=l !b/m  
 BITMAPINFOHEADER bih; oxPb; %  
 bih.biBitCount=btm.bmBitsPixel; {m%X\s;ni  
 bih.biClrImportant=0; |!{ BjOAD'  
 bih.biClrUsed=0; bz? *#S  
 bih.biCompression=0; d.&~n`Rv!p  
 bih.biHeight=btm.bmHeight; M^^u{);q  
 bih.biPlanes=1; cIgicp}U  
 bih.biSize=sizeof(BITMAPINFOHEADER); $wn "+wX  
 bih.biSizeImage=size; ,FPgbs  
 bih.biWidth=btm.bmWidth; +>5 "fs$Y  
 bih.biXPelsPerMeter=0; \l leO|m  
 bih.biYPelsPerMeter=0; D:HeP:.I  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?iBHJ{  
 static int filecount=0; 2v<[XNX  
 CString name; b#C"rTw  
 name.Format("pict%04d.bmp",filecount++); 4&/-xg87(  
 name=m_Path+name; f(E  'i>  
 BITMAPFILEHEADER bfh; rXz,<^Hmj  
 bfh.bfReserved1=bfh.bfReserved2=0; Ucnit^,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !Jj=H()}  
 bfh.bfSize=54+size; YtrMJ"  
 bfh.bfOffBits=54; VRoeq {  
 CFile bf; a;Y9wn  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (Rk g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); w`Dzk. 2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); EF{_-FXY  
  bf.WriteHuge(lpData,size); -3r&O:  
  bf.Close(); JPk3T.qp  
  nCount++; C6eon4Ut  
 } LV 94i  
 GlobalFreePtr(lpData); 4>^ %_Xj[  
 if(nCount==1) QE5 85s5  
  m_Number.Format("%d picture captured.",nCount); 2'J.$ h3  
 else -K/' }I  
  m_Number.Format("%d pictures captured.",nCount); 2Xgw7` !L  
  UpdateData(FALSE); D] 2+<;>`>  
} 0nz k?iP  
8L 9;VY^Y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .{-8gAh  
{ UgJ^NF2w  
 if(pMsg -> message == WM_KEYDOWN) 9=I(AYG{m  
 { 6#5@d^a  
  if(pMsg -> wParam == VK_ESCAPE) \o@b5z ]e  
   return TRUE; 9ffRY,1@  
  if(pMsg -> wParam == VK_RETURN) ?kb\%pcK  
   return TRUE; ^\mN<z(  
 } >|7&hj$  
 return CDialog::PreTranslateMessage(pMsg); zT~ GBC-IX  
} 1)NX;CN  
Pwz^{*u]  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VPg`vI$(X  
{ *(d^ k;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ &^9>h/-XT  
  SaveBmp(); M)EUR0>8  
  return FALSE; -ij1%#tz  
} J\   
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Ye!=  
 CMenu pop; K"b vUH  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Hv0sl+  
 CMenu*pMenu=pop.GetSubMenu(0); p9_45u`u2  
 pMenu->SetDefaultItem(ID_EXITICON); A Sy7")5  
 CPoint pt; zAB-kE\ )  
 GetCursorPos(&pt); k=bv!T_o  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); n*iaNaU"'  
 if(id==ID_EXITICON) M7,|+W/RK  
  DeleteIcon(); +U%lWE%  
 else if(id==ID_EXIT) _z m<[0(  
  OnCancel(); =$Q3!bJ  
 return FALSE; xYt{=  
} NM ~e  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); *vsOL 4I%  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) B?Y%y@.  
 AddIcon(); p|Rxy"}  
 return res; hY'"^?OP  
} G';oM;~/|  
~`_nw5y  
void CCaptureDlg::AddIcon() +bf%]   
{ |klL KX&  
 NOTIFYICONDATA data; p dnL~sv  
 data.cbSize=sizeof(NOTIFYICONDATA); N'm:V  
 CString tip; web&M!-  
 tip.LoadString(IDS_ICONTIP); bJB:]vs$  
 data.hIcon=GetIcon(0); =AcbX_[  
 data.hWnd=GetSafeHwnd(); KS(T%mk\  
 strcpy(data.szTip,tip); sQihyq6U;  
 data.uCallbackMessage=IDM_SHELL; YN>#zr+~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?QVD)JI*k  
 data.uID=98; Cv$TNkP*  
 Shell_NotifyIcon(NIM_ADD,&data); cS ];?tqrA  
 ShowWindow(SW_HIDE); 4N` MY8',  
 bTray=TRUE; <!OP b(g2  
} tg8VFH2q.z  
1NOz $fW  
void CCaptureDlg::DeleteIcon() 'OX6e Y5  
{ S-f3rL[?  
 NOTIFYICONDATA data; 2,QkktJLo  
 data.cbSize=sizeof(NOTIFYICONDATA); qs-:JmA_w  
 data.hWnd=GetSafeHwnd(); \HK#d1>ox  
 data.uID=98; :f/ p5 c  
 Shell_NotifyIcon(NIM_DELETE,&data); U-n33ty`H  
 ShowWindow(SW_SHOW); ax>c&%vo  
 SetForegroundWindow(); @fE^w^K7  
 ShowWindow(SW_SHOWNORMAL); cF vGpZ  
 bTray=FALSE; (c[h,>`@:  
} *.nqQhW  
/CA)R26G  
void CCaptureDlg::OnChange() v@t*iDa?7  
{ 3UN Jj&-`  
 RegisterHotkey(); !&'xkw`  
} &aF_y_f\  
] &G5/ ]f  
BOOL CCaptureDlg::RegisterHotkey() A&t'uY6  
{ swLgdk{8n  
 UpdateData(); :&or'Yi}  
 UCHAR mask=0; |g'sRTKJ  
 UCHAR key=0; <RhKlCP  
 if(m_bControl) i*U\~CZjT  
  mask|=4; VJR'B={h  
 if(m_bAlt) )uX:f8  
  mask|=2; fnmZJJ,Q  
 if(m_bShift) )E[5lD61  
  mask|=1; U<6k!Y9ny  
  key=Key_Table[m_Key.GetCurSel()]; l E&hw  
 if(bRegistered){ s*8hN*A/,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); vy"Lsr3  
  bRegistered=FALSE; ;!~;05^iD  
 } dIpt&nH&$  
 cMask=mask; 'Vrev8D  
 cKey=key; /e7'5#v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); nL:vRJr-$  
 return bRegistered; 4 ^+hw;  
} ASYUKh,h  
vSnb>z1  
  四、小结 %cm5Z^B1"  
a<Ns C1  
  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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