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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: E Xo"F*gW  
  x.}iSE{  
  一、实现方法 P PmE.%_  
{:!*1L  
  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: _d,_&7  
nww,y  
#pragma data_seg("shareddata") y/ vE  
HHOOK hHook =NULL; //钩子句柄 hoPCbjkov  
UINT nHookCount =0; //挂接的程序数目 hfVJg7-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9D-PmSnv  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _>*TPlB  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 9'T nR[>  
static int KeyCount =0; -R| v&h%T  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 j].XVn,  
#pragma data_seg() VYik#n>|Gp  
%~G)xK?W*  
  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。 Y+lZT4w  
_?mu2!X  
  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: I+ydVj(Op  
wR\%tumk  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR .y|*  
cKey,UCHAR cMask) /2 WGo-  
{ b$%W<D  
 BOOL bAdded=FALSE;  ig jr=e  
 for(int index=0;index<MAX_KEY;index++){  w8$8P  
  if(hCallWnd[index]==0){ qK,rT*5=  
   hCallWnd[index]=hWnd; z GA1  
   HotKey[index]=cKey; Np+<)q2  
   HotKeyMask[index]=cMask; {0QNqjue  
   bAdded=TRUE; >pUR>?t"  
   KeyCount++; CKy' 8I9  
   break; =`99ez+y  
  } FL9 Dz4  
 } O_*%_S}F&  
 return bAdded; 3Vs8"BFjz  
} 0.=dOz r  
//删除热键 M;-PrJdyt  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7S}NV7  
{ i=nd][1n  
 BOOL bRemoved=FALSE; 4Zo.c* BZ  
 for(int index=0;index<MAX_KEY;index++){ V*}ft@GPD  
  if(hCallWnd[index]==hWnd){ 4ba[*R2  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,F!zZNW9  
    hCallWnd[index]=NULL; EWrIDZi  
    HotKey[index]=0; xN'$ Yh  
    HotKeyMask[index]=0; 3c}@_Yn  
    bRemoved=TRUE; f;x0Ho5C2  
    KeyCount--; 3fM8W> *7  
    break; I w~R@,  
   } WB K6Ug  
  } BF b<"!Y  
 } T]HeS(  
 return bRemoved; "A6m-xE~  
} QVJq%P  
,` 6O{Z~  
oIrO%v:'!  
  DLL中的钩子函数如下: lK 5@qG#  
SYkwM6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s'b 4Me  
{ Y 3h`uLQ  
 BOOL bProcessed=FALSE; FC@h6 \+a  
 if(HC_ACTION==nCode) ?(0=+o(`  
 { C.].HQ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开  k{d]  
   switch(wParam) 2RG6m=Y8y  
   {  ~G,_4}#"pM  
    case VK_MENU: -n FKP&P  
     MaskBits&=~ALTBIT; 9kHVWDf  
     break; vJ9I z  
    case VK_CONTROL: ^m~&2l\N=  
     MaskBits&=~CTRLBIT; d<K2 \:P{}  
     break; r2yJ{j&s  
    case VK_SHIFT: ( RO-~-  
     MaskBits&=~SHIFTBIT; 70Jx[3vr  
     break; & %A&&XT9  
    default: //judge the key and send message !mHMFwvS  
     break; GZH{"_$  
   } `Y O(C<r-  
   for(int index=0;index<MAX_KEY;index++){ Pm&hv*D  
    if(hCallWnd[index]==NULL) & 6'Rc#\P  
     continue; sPX&XqWx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FJ,"a%m/Q  
    { }C4wED.  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); u}3D'h  
     bProcessed=TRUE; Znr@-=xZO*  
    } YLJ^R$pi  
   } ckGmwYP9  
  } v;soJlxF~  
  else if((lParam&0xc000ffff)==1){ //有键按下 hh8Grl;  
   switch(wParam) %5RR<[_/;  
   { 3{$vN).  
    case VK_MENU: >Q $ph=  
     MaskBits|=ALTBIT; |;:g7eb  
     break; dq,j?~ _}  
    case VK_CONTROL: Yw] 7@  
     MaskBits|=CTRLBIT; v{d$DZUs  
     break; J-#V_TzJ?  
    case VK_SHIFT: NNt  n  
     MaskBits|=SHIFTBIT; &hEn3u  
     break; &S,_Z/BS;  
    default: //judge the key and send message "!+gA&  
     break; <Pzy'9  
   } Lq|>n Y  
   for(int index=0;index<MAX_KEY;index++){ J 2<kOXXJ9  
    if(hCallWnd[index]==NULL) ijsoY\V50  
     continue; IjGPiC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pHT]2e#  
    { B (Ps/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); cbN;Kv?ak}  
     bProcessed=TRUE; m g,1*B'  
    } ^/_Yk.w  
   } T/a=z  
  } 4-~Z{#-  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 &rGB58  
   for(int index=0;index<MAX_KEY;index++){ KL9k9|!p  
    if(hCallWnd[index]==NULL) fIl;qGz85  
     continue; WQ{[q" O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `78Bv>[A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); z/u^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8N%nG( 0  
   } |BbzRis  
  } dvZH~mF  
 } (:aU"5M  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); AtewC Yo  
}  D|)a7_  
OvAhp&k  
  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: +$|fUn{  
W:,Wex^9n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K>dB{w#gS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); om`T/@_,  
jUEgu  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ki?h7  
! !A0K"h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #F`A(n  
{ t%;w<1E  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) d2V X\  
 { R*:>h8  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [% C,&h5  
  SaveBmp(); s bj/d~$N  
  return FALSE; H T|DT  
 } #8|LPfA  
 …… //其它处理及默认处理 i|J%jA  
} <XIIT-b[  
qT48Y  
oQ 2$z8  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 )rq |t9kix  
MC* Hl`C  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ^cm ] [9  
ZUHRATT-  
  二、编程步骤 7~SwNt,  
0?<#!  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; z$e6T&u5B  
Pg%9hejf3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ? 3=G'Ip5n  
%WgN+A0  
  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; 2%dL96  
&}r"Z?f)  
  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; fes s6=k  
b, Oh8O;>  
  5、 添加代码,编译运行程序。  .qgUD  
H5T_i$W  
三、程序代码 G18w3BFx  
]K"&Vd  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL O\6U2b~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _dJ(h6%3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 5J10S  
#if _MSC_VER > 1000 6RnzT d  
#pragma once {drc}BL_  
#endif // _MSC_VER > 1000 5~|{:29X  
#ifndef __AFXWIN_H__ Snx!^4+MF  
#error include 'stdafx.h' before including this file for PCH a YWWln  
#endif $VuXr=f}  
#include "resource.h" // main symbols ){*+s RBW  
class CHookApp : public CWinApp "j@\a)a  
{ 5&ku]l+  
 public: K]hp-QK<  
  CHookApp(); $"r9U|6kk  
  // Overrides c-sjYJXKM*  
  // ClassWizard generated virtual function overrides Q?#I{l)V(  
  //{{AFX_VIRTUAL(CHookApp) 2;8m0+tl  
 public: `gX@b^  
  virtual BOOL InitInstance(); .UG`pRC  
  virtual int ExitInstance(); ?13qDD:  
  //}}AFX_VIRTUAL fSkDD>&  
  //{{AFX_MSG(CHookApp) |_V(^b}  
  // NOTE - the ClassWizard will add and remove member functions here. `POzwYh  
  // DO NOT EDIT what you see in these blocks of generated code ! wI$ a1H  
  //}}AFX_MSG {FNkPX  
  DECLARE_MESSAGE_MAP() ?, S/>SP  
}; DN*5q9.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); l3>S{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CMXF[X)%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AcC &Q:g  
BOOL InitHotkey(); yD7BZI xW  
BOOL UnInit(); ;-+q*@sa]  
#endif or/gx3  
zx3gz7>k;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. qN $t_  
#include "stdafx.h" 0cd_l 2f#g  
#include "hook.h" \D7bTn  
#include <windowsx.h> qqrjI.  
#ifdef _DEBUG V' Gal`  
#define new DEBUG_NEW 'X^auyL  
#undef THIS_FILE Y`;}w}EcgR  
static char THIS_FILE[] = __FILE__; F5h/>  
#endif FSIiw#xzH  
#define MAX_KEY 100 5(3O/C{?~  
#define CTRLBIT 0x04 "& ,ov#  
#define ALTBIT 0x02 fw%`[( hK  
#define SHIFTBIT 0x01 CSO'``16  
#pragma data_seg("shareddata") &{}Mds  
HHOOK hHook =NULL; jJy:/!i  
UINT nHookCount =0; EB~]6.1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?sf<cFF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 1E+12{~m"i  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey g !'R}y  
static int KeyCount =0; gcJ!_KZK  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift $[ {5+*  
#pragma data_seg() g7\ =  
HINSTANCE hins; mdj%zJ8/  
void VerifyWindow(); `o[l%I\Q  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) W>K^55'  
//{{AFX_MSG_MAP(CHookApp) $x0SWJ \G  
// NOTE - the ClassWizard will add and remove mapping macros here. >STtX6h  
// DO NOT EDIT what you see in these blocks of generated code! ]A*}Dem*5  
//}}AFX_MSG_MAP Q7 BbST+  
END_MESSAGE_MAP() fB+L%+mr8  
y&/IJst&aq  
CHookApp::CHookApp() C($l'jd&  
{ !"rPSGK*  
 // TODO: add construction code here, p4`1^}f&Ie  
 // Place all significant initialization in InitInstance o NtFYY  
}  : T*Q2  
#9vC]Gm  
CHookApp theApp; Shm> r@C?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) / ^.|m3  
{ (WM3(US|  
 BOOL bProcessed=FALSE; aurs~  
 if(HC_ACTION==nCode) vg z`+Zj*S  
 { "y1Iu   
  if((lParam&0xc0000000)==0xc0000000){// Key up YR%iZ"`*+O  
   switch(wParam) NAbVH{*\U  
   { dbI>\khI  
    case VK_MENU: oQ!M+sRmF  
     MaskBits&=~ALTBIT; :E:e ^$p  
     break; T$4{fhV \  
    case VK_CONTROL: zWHq4@K  
     MaskBits&=~CTRLBIT; _?{7%(C  
     break; JJ?{V:  
    case VK_SHIFT: C?PQ>Q!f-  
     MaskBits&=~SHIFTBIT; Z_d"<k}I  
     break; "yWw3(V2>  
    default: //judge the key and send message uO?+vYAN  
     break; )!T~l(g  
   } NGx3f3 9  
   for(int index=0;index<MAX_KEY;index++){ 6TtB3;5  
    if(hCallWnd[index]==NULL) 8nz({Mb9Z  
     continue; U{U"%XdO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Q;M\fBQO}&  
    { ?,} u6tH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); TT$A o  
     bProcessed=TRUE; FFHq':v  
    } :^;c(>u{  
   } R.~[$G!  
  } D /eH~  
  else if((lParam&0xc000ffff)==1){ //Key down 9!FX *}dC  
   switch(wParam) jr6_|(0 i6  
   { )vp0X\3q`  
    case VK_MENU: Dl,QCZeM  
     MaskBits|=ALTBIT; 9&6juL  
     break; c}(WniR-"  
    case VK_CONTROL: *@U{[J  
     MaskBits|=CTRLBIT; K,b M9>}  
     break; 3DU1c?M:  
    case VK_SHIFT: r*X,]\V0x  
     MaskBits|=SHIFTBIT;  Z>[7#;;  
     break; &Y@i:O  
    default: //judge the key and send message }X(&QZ7i`  
     break; +mQ5\14#  
   } \2SbW7"/;P  
   for(int index=0;index<MAX_KEY;index++) m'4f'tbN  
   { )^2eC<t  
    if(hCallWnd[index]==NULL) qd`e:s*%  
     continue; >ohH4:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &w@]\7L,:  
    { Z8$}Rpo  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ua\t5M5  
     bProcessed=TRUE; kaG/8G(  
    } BZR{}Aj4pa  
   } ^t >mdxuq  
  } LPk@t^[  
  if(!bProcessed){ l_B735  
   for(int index=0;index<MAX_KEY;index++){ Kxe\H'rR  
    if(hCallWnd[index]==NULL) G\.~/<Mg+  
     continue; ]9@:7d6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Xn7G2Yp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); C2 N+X(  
   } c9(3z0!F ?  
  } a#oROb-*~  
 }  Fr%#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r pNb.  
} .`or^`X3  
4{VO:(geZ  
BOOL InitHotkey() /y$Omc^  
{ KA3U W  
 if(hHook!=NULL){ d} >Po%r:  
  nHookCount++; bIQ,=EA1  
  return TRUE;  q+P@2FL  
 } .)Tj}Im2p  
 else d {z[46>  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); VPLf(  
  if(hHook!=NULL) @]\fO)\f  
   nHookCount++; R@e'=z[%1  
  return (hHook!=NULL); 8K%N7RL|  
} l|5 h  
BOOL UnInit() m</m9h8  
{ b@CB +8 $  
 if(nHookCount>1){ +UzQJt/>>  
  nHookCount--; W4^L_p>Tm^  
  return TRUE; ;vn0%g  
 } kY0HP a  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $|4@Zx4vf  
 if(unhooked==TRUE){ [W[{ 4 Xu  
  nHookCount=0; 3JazQU  
  hHook=NULL; #3uv^m LGa  
 } d;i|s[6ds`  
 return unhooked; A5l Cc b  
} ts]e M1;  
FU`(mQ*Yd  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) |/.J{=E0K  
{ 5Qgu:)}  
 BOOL bAdded=FALSE; AFLtgoXn:  
 for(int index=0;index<MAX_KEY;index++){ ?K1B^M=8  
  if(hCallWnd[index]==0){ dFg>uo  
   hCallWnd[index]=hWnd;  tV}!_  
   HotKey[index]=cKey;  hfB$4s9  
   HotKeyMask[index]=cMask; {Jr1K,  
   bAdded=TRUE; _nGx[1G( 5  
   KeyCount++; qGk+4 yC  
   break; #2Rz=QI  
  } `/| *u  
 } F.s$Y+c!6  
 return bAdded; 2.qPMqH  
} H MOIUd  
yOM/UdWq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [8V;Q  
{ ~ |G&cg  
 BOOL bRemoved=FALSE; lg%fjBY  
 for(int index=0;index<MAX_KEY;index++){ Vaxg   
  if(hCallWnd[index]==hWnd){ !-I,Dh-A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4.A^5J'W  
    hCallWnd[index]=NULL; q^X7x_  
    HotKey[index]=0; w,|@e_|J  
    HotKeyMask[index]=0; ns[/M~_r  
    bRemoved=TRUE; 5eAZfe%H  
    KeyCount--; 0KA*6]h t  
    break; SmXJQ@jN  
   } 7?lz$.*Avp  
  } U~G7~L &m  
 } "8za'@D"f  
 return bRemoved; D%>Bj>xQD  
} 6)[moR{N1  
bpu`'Vx  
void VerifyWindow() Iu'9yb  
{ <,vIN,Kl8/  
 for(int i=0;i<MAX_KEY;i++){ f-U zFlU  
  if(hCallWnd!=NULL){ Ku5||u.F4*  
   if(!IsWindow(hCallWnd)){ X'A`" }=_  
    hCallWnd=NULL; lg^'/8^f  
    HotKey=0; r[9m-#)>  
    HotKeyMask=0; X4!93  
    KeyCount--; EEe$A?a;  
   } DYX{v`>f^  
  } .ARYCTyG  
 } F`=p/IAJK  
} iSfRJ:_&6  
?<Qbp;WBo  
BOOL CHookApp::InitInstance() m:BzIcW<\  
{ W]4Z4&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); zDF Nx:h  
 hins=AfxGetInstanceHandle(); GrF4*I`q  
 InitHotkey(); aZZ0eH  
 return CWinApp::InitInstance(); ^sv|m"  
} &X4anH>O  
HwU9 y   
int CHookApp::ExitInstance() E|pT6  
{ ]w*"KG!(  
 VerifyWindow(); q@.>eB'92P  
 UnInit(); IIk_!VzT  
 return CWinApp::ExitInstance(); jN6V`Wh_  
} Lf_Y4a#  
n%Oi~7>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^^q&VL  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  %:26v  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ rgy I:F.  
#if _MSC_VER > 1000 ;<~f-D,  
#pragma once E}wT5t;u  
#endif // _MSC_VER > 1000 DJGafX^  
9.)z]Gav  
class CCaptureDlg : public CDialog zC50 @S3|  
{ ?NE/ }?a  
 // Construction RO3LZBL  
 public: T;M ;c. U  
  BOOL bTray; iXWzIb}CJ-  
  BOOL bRegistered; Om.%K>V  
  BOOL RegisterHotkey(); /gAT@Vx  
  UCHAR cKey; ^f[6NYS?  
  UCHAR cMask; 0E\#!L  
  void DeleteIcon(); 7_~sa{1R.  
  void AddIcon(); D:`Q\za  
  UINT nCount; Mi]^wCF  
  void SaveBmp(); (KI9j7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor K6{wM  
  // Dialog Data #1dVp!?3T  
  //{{AFX_DATA(CCaptureDlg) bvD}N<>3N  
  enum { IDD = IDD_CAPTURE_DIALOG }; Z+B*V )a=  
  CComboBox m_Key; %9YY \a {  
  BOOL m_bControl; "#)|WVa=BM  
  BOOL m_bAlt; u|KjoO   
  BOOL m_bShift; Na@bXcz)  
  CString m_Path; Z?P^Y%ls  
  CString m_Number; jCY~Wc  
  //}}AFX_DATA +~n:*\  
  // ClassWizard generated virtual function overrides <NZPLo F  
  //{{AFX_VIRTUAL(CCaptureDlg) #7;?Ls  
 public: e5mu-  
  virtual BOOL PreTranslateMessage(MSG* pMsg); <^s31.&p  
 protected: $yU 5WEX  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Zk`y"[J  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =A!oLe$%  
  //}}AFX_VIRTUAL /? %V% n  
  // Implementation 9L$OSy|  
 protected: tR51Pw  
  HICON m_hIcon; GR|\OJ<2  
  // Generated message map functions P!-RZEt$  
  //{{AFX_MSG(CCaptureDlg) b5MBzFw  
  virtual BOOL OnInitDialog(); iM!Ya!  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b}TvQ+W]2  
  afx_msg void OnPaint(); h6k" D4o\  
  afx_msg HCURSOR OnQueryDragIcon();  Z 9:  
  virtual void OnCancel(); -k + jMH  
  afx_msg void OnAbout(); ; gBR~W  
  afx_msg void OnBrowse(); &G2&OFAr]q  
  afx_msg void OnChange(); 4eWv).  
 //}}AFX_MSG gWgp:;Me  
 DECLARE_MESSAGE_MAP() a&{Y~Og?%  
}; ZH~bY2^;  
#endif %N Q mV_1  
k'r}@-X  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file yeyDB>#Va.  
#include "stdafx.h" h: yJ  
#include "Capture.h" 4T@+gy^.  
#include "CaptureDlg.h" a~Dk@>+P>  
#include <windowsx.h> `h'+4  
#pragma comment(lib,"hook.lib") /KvJjt'8  
#ifdef _DEBUG _Q:z -si  
#define new DEBUG_NEW OUWK  
#undef THIS_FILE YPx+9^)  
static char THIS_FILE[] = __FILE__; 4AN8Sx(  
#endif )bM,>x  
#define IDM_SHELL WM_USER+1 KBM*7raA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N3$1f$`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3li$)S1z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 4T3Z9KD!8  
class CAboutDlg : public CDialog % PzkVs  
{ Z*M{  
 public: Jqb~RP~  
  CAboutDlg(); N.mRay,  
  // Dialog Data 0{vT`e'  
  //{{AFX_DATA(CAboutDlg) NzAh3k  
  enum { IDD = IDD_ABOUTBOX }; o2dO\$'  
  //}}AFX_DATA 7;+G)44  
  // ClassWizard generated virtual function overrides Hc\C0V<  
  //{{AFX_VIRTUAL(CAboutDlg) UYxn? W.g  
 protected: U 2-{p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z&QfZs  
  //}}AFX_VIRTUAL o/3.U=px~  
  // Implementation [.4{s  
 protected: e1g3a1tnWl  
  //{{AFX_MSG(CAboutDlg) ]AQ}_dRi=  
  //}}AFX_MSG fY^CI b$Y  
  DECLARE_MESSAGE_MAP() M(L6PyEa!Y  
}; # bHkI~  
3w)r""C&  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) F.U@8lr  
{ #OPEYJ;*9d  
 //{{AFX_DATA_INIT(CAboutDlg) nrY)i_\  
 //}}AFX_DATA_INIT mhVLlb Y|t  
} ,c:NdY(,)  
zg3kU65PJE  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) uD@ ZM  
{ FD[*Q2fU  
 CDialog::DoDataExchange(pDX); O*v&C Hd3  
 //{{AFX_DATA_MAP(CAboutDlg) 6yy%_+k*  
 //}}AFX_DATA_MAP .v(GVkE}  
} wH8J?j"5>  
,=\.L_'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) i{m!v6j:  
 //{{AFX_MSG_MAP(CAboutDlg) T^Ia^B-%}g  
 // No message handlers )Zr\W3yWX  
 //}}AFX_MSG_MAP .8W-,R4  
END_MESSAGE_MAP() "a].v 8l!  
N ;=z o-8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y_Fn)(  
: CDialog(CCaptureDlg::IDD, pParent) 6 eryf?  
{ /pjl6dJ t  
 //{{AFX_DATA_INIT(CCaptureDlg) "LTw;& y  
  m_bControl = FALSE; A:ts_*  
  m_bAlt = FALSE; =s!0EwDH3  
  m_bShift = FALSE; C jf<,x$  
  m_Path = _T("c:\\"); 6HZtdRQF  
  m_Number = _T("0 picture captured."); FB wG3x  
  nCount=0; ~qQZhu"  
  bRegistered=FALSE; L9O;K$[s  
  bTray=FALSE; 2!0tD+B  
 //}}AFX_DATA_INIT ^+Nd\tp  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \t)va:y  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Hy4;i^Ik <  
} +z nlf-  
F oC $X  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) |;NfH|43;  
{ *-PjcF}Y  
 CDialog::DoDataExchange(pDX); }Q4Vy  
 //{{AFX_DATA_MAP(CCaptureDlg) ?|kbIZP(  
  DDX_Control(pDX, IDC_KEY, m_Key); @*|VWHR  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); g;=VuQuP|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); xI{fd1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); t3<8n;'y:  
  DDX_Text(pDX, IDC_PATH, m_Path); 27N;>   
  DDX_Text(pDX, IDC_NUMBER, m_Number); )qb'tZz/g_  
 //}}AFX_DATA_MAP OW#0$%f  
} s8&q8r7%  
~2\Sn-`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8<"g&+T  
//{{AFX_MSG_MAP(CCaptureDlg) joskKik^  
 ON_WM_SYSCOMMAND() W]/J]O6  
 ON_WM_PAINT() ;*Vnwt A  
 ON_WM_QUERYDRAGICON() B>c$AS\5y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /V09Na,N  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) &u[{VR:  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ymxA<bICS8  
//}}AFX_MSG_MAP BW)-F (v   
END_MESSAGE_MAP() 1s(T#jh  
g ptf*^s  
BOOL CCaptureDlg::OnInitDialog() xjr4')h  
{ T`wDdqWbEG  
 CDialog::OnInitDialog(); QNOdt2NN  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vY_[@y  
 ASSERT(IDM_ABOUTBOX < 0xF000); `2]0 X#R  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Oe1WnS 7(]  
 if (pSysMenu != NULL) z(A[xN@/W<  
 { 1W'Ai"DLw  
  CString strAboutMenu; SbGdcCB  
  strAboutMenu.LoadString(IDS_ABOUTBOX); yn}Dj9(q  
  if (!strAboutMenu.IsEmpty()) H;4QuB'^  
  { ,B'=$PO%  
   pSysMenu->AppendMenu(MF_SEPARATOR); y:98}gW`n  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); AC1RP`c  
  } K7`6G[RMb  
 } hUi@T}aA|  
 SetIcon(m_hIcon, TRUE); // Set big icon DAb/B  
 SetIcon(m_hIcon, FALSE); // Set small icon r|UJJ9i  
 m_Key.SetCurSel(0); 1l$ C3c  
 RegisterHotkey(); %4m Nk}tyH  
 CMenu* pMenu=GetSystemMenu(FALSE); g8uqW1E^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =oI[E~1<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); z(LR!hr  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3bWGWI  
 return TRUE; // return TRUE unless you set the focus to a control _Z]l=5d  
} 'wEQvCS  
<z\SKR[  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |Jn|GnM  
{ Is4,QnY_[  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g0j)k6<6(Y  
 {  j5/pVXO  
  CAboutDlg dlgAbout; x4_MbUe  
  dlgAbout.DoModal(); ^+D/59I  
 } I`{*QU  
 else ~BuzI9~7P  
 { w{aGH/LN  
  CDialog::OnSysCommand(nID, lParam); 3h:~NL  
 } jzV"(p!  
} 73rme,   
r{v3 XD/  
void CCaptureDlg::OnPaint() Fge%6hu  
{ 4& cQW)  
 if (IsIconic()) :rU.5(,  
 { 3S3(Gl  
  CPaintDC dc(this); // device context for painting +"-l~`+<es  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); u!|_bI3  
  // Center icon in client rectangle ,Suk_aX>  
  int cxIcon = GetSystemMetrics(SM_CXICON); Axsezr/  
  int cyIcon = GetSystemMetrics(SM_CYICON); jKmjZz8L]%  
  CRect rect; # &.syD#  
  GetClientRect(&rect); T" {~mQ*  
  int x = (rect.Width() - cxIcon + 1) / 2; kMCP .D45;  
  int y = (rect.Height() - cyIcon + 1) / 2; :Q DkaA  
  // Draw the icon  bUS:c 2"  
  dc.DrawIcon(x, y, m_hIcon); Oq~{HJ{  
 } Qw2`@P8W  
 else )). =MTk  
 { )&_bY~P  
  CDialog::OnPaint(); SX"|~Pi(  
 } uX_#NP/2  
} cEu_p2(7!B  
B1_9l3RM  
HCURSOR CCaptureDlg::OnQueryDragIcon() g ZtQtFi  
{ Ob]\t/:%P  
 return (HCURSOR) m_hIcon; b5)^g+8)w  
} "b`#RohCi  
dh`s^D6Q>  
void CCaptureDlg::OnCancel() [T_[QU:A  
{ 1ARtFR2C{b  
 if(bTray) }{N#JTmjB#  
  DeleteIcon(); 'O)v@p "  
  CDialog::OnCancel(); <@(\z   
} >u> E !5O  
b\ED<'  
void CCaptureDlg::OnAbout() :bct+J}l~  
{ O80Z7  
 CAboutDlg dlg; T+Re1sPr?  
 dlg.DoModal(); HjA~3l7  
} P_3IFHe  
$/"Ymm#"\Y  
void CCaptureDlg::OnBrowse() @`KbzN_h/  
{ =hTJp/L  
 CString str;  #B~ ;j5  
 BROWSEINFO bi; ,JdBVt  
 char name[MAX_PATH]; XA#qBxp/h  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Xw9]WJc  
 bi.hwndOwner=GetSafeHwnd(); ]2m=lt1  
 bi.pszDisplayName=name; NW6;7nWb  
 bi.lpszTitle="Select folder"; gS<p~LPf  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 4ct-K)Ris  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !QwB8yK@  
 if(idl==NULL) <lFHmi$qt{  
  return; esTL3 l{[  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); t#P7'9Se8  
 str.ReleaseBuffer(); |.Vgk8oTl  
 m_Path=str; v];YC6shx  
 if(str.GetAt(str.GetLength()-1)!='\\') 8i] S[$Fc  
  m_Path+="\\"; (Z>?\iNJ  
 UpdateData(FALSE); mh"PAp  
} LAc60^t1  
u_WUJ_  
void CCaptureDlg::SaveBmp() E|;>!MMA;  
{ S*G^U1Sc+  
 CDC dc; E|9`J00  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [xM&Jdf8  
 CBitmap bm; gH(#<f@ZI  
 int Width=GetSystemMetrics(SM_CXSCREEN); #9(+)~irz`  
 int Height=GetSystemMetrics(SM_CYSCREEN); {D8opepO)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |Jx:#OM  
 CDC tdc; ltNI+G  
 tdc.CreateCompatibleDC(&dc); v+x<X5u  
 CBitmap*pOld=tdc.SelectObject(&bm); z{3`nd,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); MRz f#o<H  
 tdc.SelectObject(pOld); k^d]EF  
 BITMAP btm; -%J9!(  
 bm.GetBitmap(&btm); Vyi.:lL _8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; w%`S>+kX&  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); spP[S"gI  
 BITMAPINFOHEADER bih; f`ibP6%  
 bih.biBitCount=btm.bmBitsPixel; mxCneX  
 bih.biClrImportant=0; *^@b0f~vj  
 bih.biClrUsed=0; >uZc#Zt  
 bih.biCompression=0; Hx+r9w  
 bih.biHeight=btm.bmHeight; ?a,#p  
 bih.biPlanes=1; 6P@K]jy& n  
 bih.biSize=sizeof(BITMAPINFOHEADER); cu1!WD  
 bih.biSizeImage=size; 8zMGpY#  
 bih.biWidth=btm.bmWidth; r(wf>w3  
 bih.biXPelsPerMeter=0; 40=u/\/K  
 bih.biYPelsPerMeter=0; 4PD5i  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); )kjQ W&)g  
 static int filecount=0; bJPKe]spJ=  
 CString name; rYt|[Pk  
 name.Format("pict%04d.bmp",filecount++); kO`!!M[Oo  
 name=m_Path+name; x_O:IK.>  
 BITMAPFILEHEADER bfh; 92Gfxld\  
 bfh.bfReserved1=bfh.bfReserved2=0; uy2~<)  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -,*m\Fe}  
 bfh.bfSize=54+size; a=ZVKb  
 bfh.bfOffBits=54; =k d-rIBc  
 CFile bf; 56YqYu.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ='.b/]!_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 0 J"g"=  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u `ww  
  bf.WriteHuge(lpData,size); l$!ExXEZO;  
  bf.Close(); V"8Go;[  
  nCount++; &&$*MHJ  
 } 3-{WFnA  
 GlobalFreePtr(lpData); b&E"r*i|  
 if(nCount==1) l@w\ Vxr  
  m_Number.Format("%d picture captured.",nCount); ?r|iZKa  
 else & +`g~6U  
  m_Number.Format("%d pictures captured.",nCount); < `;Mf>V  
  UpdateData(FALSE); [}Xw/@Uc;  
} Wx#l}nD  
? Lxc1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) @P0rNO %y  
{ 5/6Jq  
 if(pMsg -> message == WM_KEYDOWN) N4qBCBr(  
 { jXmY8||w  
  if(pMsg -> wParam == VK_ESCAPE) r-S%gG}~E  
   return TRUE; v" #8^q  
  if(pMsg -> wParam == VK_RETURN) Edc3YSg%;  
   return TRUE; 7?g({]  
 }  IN6L2/Q  
 return CDialog::PreTranslateMessage(pMsg); eI`%J3BxR  
} (5`(H.(  
A]QGaWK  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;XNC+mPK  
{ KRm)|bgE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 9qi|)!!L  
  SaveBmp(); 07qjWo/t  
  return FALSE; g@O?0,+1  
} ShtV2}s|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d$\n@}8eZp  
 CMenu pop; 1M)88&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )X*_oH=  
 CMenu*pMenu=pop.GetSubMenu(0); Zd)LVc[  
 pMenu->SetDefaultItem(ID_EXITICON); JI-.SR  
 CPoint pt; Q+a&a]*KL^  
 GetCursorPos(&pt);  7a_u=\,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); SsMs#C8u%  
 if(id==ID_EXITICON) ,,j >2Ts  
  DeleteIcon(); /w6'tut  
 else if(id==ID_EXIT) ^Hf?["m^@  
  OnCancel(); D?xR>Oo)  
 return FALSE; ?Nt m5(R  
} Su@V5yz  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3&[d.,/  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) _W Hi<,-  
 AddIcon(); &!:mL],  
 return res; S h5m+>7K  
} VtN@B*  
eGKvzu  
void CCaptureDlg::AddIcon() kG4])qxC'  
{ j/wQ2"@a  
 NOTIFYICONDATA data; k;Qm%B  
 data.cbSize=sizeof(NOTIFYICONDATA); b:O_PS5h  
 CString tip; \qW^AD(it<  
 tip.LoadString(IDS_ICONTIP); T|$tQgY^  
 data.hIcon=GetIcon(0); UaXIrBc  
 data.hWnd=GetSafeHwnd(); ;\13x][  
 strcpy(data.szTip,tip); T{3-H(-gA  
 data.uCallbackMessage=IDM_SHELL; NP\/9 8|1  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4%yeEc ;z  
 data.uID=98; R Ee~\n+P^  
 Shell_NotifyIcon(NIM_ADD,&data); R SWw4}  
 ShowWindow(SW_HIDE); YuO!Y9iEm  
 bTray=TRUE; Cvt/ot-J?  
} F` gK6;zp  
ER!s  
void CCaptureDlg::DeleteIcon() jX$U)O  
{ lUnC+w#[  
 NOTIFYICONDATA data; LChwHkRHJI  
 data.cbSize=sizeof(NOTIFYICONDATA); =`MQKh,  
 data.hWnd=GetSafeHwnd(); ^5!"[RB\  
 data.uID=98; W^,p2  
 Shell_NotifyIcon(NIM_DELETE,&data); Ly`.~t(~l  
 ShowWindow(SW_SHOW); MnY}U",   
 SetForegroundWindow(); w2!5TKZ`  
 ShowWindow(SW_SHOWNORMAL); <gvgr4@^yR  
 bTray=FALSE; ~O /B  
} ? R[GSS1  
}*P;kV  
void CCaptureDlg::OnChange() ucLh|}jJ5  
{ R6GlQ G  
 RegisterHotkey(); bV)h\:oC  
} F&+_z&n)  
L?(1 [jB4G  
BOOL CCaptureDlg::RegisterHotkey() T-oUcuQB  
{ ]xV2= !J  
 UpdateData(); h!Fh@%  
 UCHAR mask=0; Rh@UxNy\,  
 UCHAR key=0; 8"wavh|g4  
 if(m_bControl) rUB67ok*  
  mask|=4; l@<Jp *|  
 if(m_bAlt) ;,KT+!H$  
  mask|=2; 1OK~*=/4  
 if(m_bShift) XS0NjZW  
  mask|=1; M}" KAa  
  key=Key_Table[m_Key.GetCurSel()]; ~ ^~+p  
 if(bRegistered){ '<C#"2  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); WH+S d  
  bRegistered=FALSE; (H|^Ow5  
 } eg"!.ol  
 cMask=mask; J<iiA:&J  
 cKey=key; B]#iZ,Tp  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); #@M'*X_%}K  
 return bRegistered; V8%( h[  
} Zqg AgN@  
TPKm>5g  
  四、小结 _(@ezX.p  
b]Lp_t  
  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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