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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: Qh4@Nl#Ncf  
  *]<M%q!<6  
  一、实现方法 DnbT<oEL  
[If%+mHdU  
  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: -;5WMX 6  
AE1EZ#  
#pragma data_seg("shareddata") cG)i:  
HHOOK hHook =NULL; //钩子句柄 I9xQ1WJc`  
UINT nHookCount =0; //挂接的程序数目 K-%x] Fp=  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Ns?8N":  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 (;RmfE'PX  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \-X Qo  
static int KeyCount =0; )%8 ;C]G;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 c{YBCWA  
#pragma data_seg() Up:<NHJT  
2Zf} t  
  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。 G}!dm0s$  
8y9oj9 ;E]  
  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:  4x.1J  
c&!EsMsU  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR J$' Q3k  
cKey,UCHAR cMask) <m;idfn  
{ 4bV&U=  
 BOOL bAdded=FALSE; tOn 6  
 for(int index=0;index<MAX_KEY;index++){ (/x%zmY;/U  
  if(hCallWnd[index]==0){ nE$8-*BZ_  
   hCallWnd[index]=hWnd; #\15,!*a=  
   HotKey[index]=cKey; TqzL]'NS+  
   HotKeyMask[index]=cMask; }$6;g-|HX  
   bAdded=TRUE; -4  ~(*  
   KeyCount++; TvV_Tz4e  
   break; gXrPZ|iS  
  } r_m*$r~f  
 } x+?P/Ckg  
 return bAdded; Mf 7 Z5  
} $ {Y? jJ  
//删除热键 &NvvaqJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) dMo456L  
{ A .]o&S}  
 BOOL bRemoved=FALSE; CC?L~/gPN  
 for(int index=0;index<MAX_KEY;index++){ {s]yP_  
  if(hCallWnd[index]==hWnd){ ${(c `X  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k!9LJ%Xh  
    hCallWnd[index]=NULL; }n!$)W*?  
    HotKey[index]=0; +M@,CbqD  
    HotKeyMask[index]=0; H0!W:cIS;l  
    bRemoved=TRUE; ]yc&ffe%  
    KeyCount--; |=R@nn   
    break; teRK#: .P  
   } An cka  
  } u"WqI[IV  
 } 2n/cq K   
 return bRemoved; 3aD\J_  
} ]+C;C  
XTzz/.T;Z  
/z'fFl^6O  
  DLL中的钩子函数如下: *@2+$fgz  
,hMd xZJd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9j[lr${A  
{ a]JQZo1$  
 BOOL bProcessed=FALSE; lCyBdY9n  
 if(HC_ACTION==nCode) hUL5V1-j  
 { R^[b I;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @-^jbmu^ P  
   switch(wParam) -SyQ`V)T7N  
   {  $mH'%YDIl  
    case VK_MENU: E5>y?N  
     MaskBits&=~ALTBIT; ],!7S"{97  
     break; 6p=OM=R  
    case VK_CONTROL: 9E@}@ZV(  
     MaskBits&=~CTRLBIT; Xs,[Z2_iq  
     break; {*#}"/:8K  
    case VK_SHIFT: )GbVgYkk  
     MaskBits&=~SHIFTBIT; AeQIsrAHE  
     break; A>0wqT  
    default: //judge the key and send message $w:7$:k  
     break; @ V_@r@A  
   } ;v}f7v '  
   for(int index=0;index<MAX_KEY;index++){ G<dWh.|`=  
    if(hCallWnd[index]==NULL) z8MKGM  
     continue; }&E'ox<S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]]R!MnU:$  
    { P~6QRm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (x+C =1,  
     bProcessed=TRUE; h;s~I/e(  
    } aPELAU-  
   } ceKR?%8s  
  } ~~8?|@V  
  else if((lParam&0xc000ffff)==1){ //有键按下 p3e_:5k  
   switch(wParam) be@\5  
   { \J)ffEKIp  
    case VK_MENU: )MV`(/BC*  
     MaskBits|=ALTBIT; 0 It[Pa qG  
     break; cx+li4v  
    case VK_CONTROL: XIS.0]~  
     MaskBits|=CTRLBIT; '4T]=s~N  
     break; ,_G((oS40  
    case VK_SHIFT: QTy xx  
     MaskBits|=SHIFTBIT; f@G3,u!]i  
     break; <'Ppu  
    default: //judge the key and send message z_gjC%(y  
     break; Zze(Ik  
   } e9F\U   
   for(int index=0;index<MAX_KEY;index++){ a>_Cxsb&`  
    if(hCallWnd[index]==NULL) |I0O|Zdv  
     continue; q?9x0L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RV%aFI )  
    { Ao2m"ym  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 49e~/YY  
     bProcessed=TRUE; equ|v~@ y  
    } r[u@ [  
   } (toN? ?r  
  } @,=E[c 8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7KB:wsz^  
   for(int index=0;index<MAX_KEY;index++){ -5&|"YYjr{  
    if(hCallWnd[index]==NULL) {9/ayG[98  
     continue; U\<8}+x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &EZq%Sd  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); W7sx/O9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +"~~; J$  
   } }3}{}w0Y  
  } \!]Zq#*kH  
 } 4R;6u[ a]u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ``Yw-|&:Ae  
} ]>:LHW  
Q5!"tF p  
  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: qGH s2Og  
,(D:cRN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =P,h5J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XBTtfl &  
{H\(H _X  
  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: gG>|5R0  
hwon ^?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Msk^H7  
{ |= xK-;qs  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) g_T[m*  
 { tB,1+I=   
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 t%B ,ATW  
  SaveBmp(); yv2&K=rZp  
  return FALSE; =9LeFrz  
 } Ah|,`0dw  
 …… //其它处理及默认处理 8/tvS8I#y  
} zG[GyyAQ  
vv9=g*"j  
=Nc}XFq  
  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。 G#|`Bjv"aP  
L#\!0YW/@  
  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。 0-N"_1k|?  
b }^ylm  
  二、编程步骤 *8a8Ng  
ne~=^IRB  
  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"; B\tP{}P8{  
xDJs0P4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; SF 7p/gG  
@Yl&Jg2l'  
  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; :X66[V&eH  
R Cgn\  
  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; R cz;|h8  
Cq<a|t  
  5、 添加代码,编译运行程序。 a$7}41F[~s  
9"#,X36  
三、程序代码 o'`:$ (  
ipIexv1/S  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 8}Qmhm`_j=  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) IpRdGT02  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ]P5|V4FXo  
#if _MSC_VER > 1000 NDmTxW#g  
#pragma once t/3t69\x  
#endif // _MSC_VER > 1000 YpGG^;M$  
#ifndef __AFXWIN_H__ tbNIl cAWS  
#error include 'stdafx.h' before including this file for PCH 3~r>G  
#endif NJe^5>4`  
#include "resource.h" // main symbols G(;C~kHX  
class CHookApp : public CWinApp h VQj$TA  
{ \?|FB~.Ry  
 public: sXpA^pT"T  
  CHookApp(); 65~X!90k  
  // Overrides $v6`5;#u  
  // ClassWizard generated virtual function overrides X=W.{?  
  //{{AFX_VIRTUAL(CHookApp) #cZ<[K q6  
 public: [5iBXOmpS=  
  virtual BOOL InitInstance(); ;mi+[`E  
  virtual int ExitInstance(); 2brxV'tk  
  //}}AFX_VIRTUAL |#)S`Ua1  
  //{{AFX_MSG(CHookApp) {FrcpcrQa  
  // NOTE - the ClassWizard will add and remove member functions here. DO^K8~]  
  // DO NOT EDIT what you see in these blocks of generated code ! $?e_ l  
  //}}AFX_MSG E&wz0d;gf  
  DECLARE_MESSAGE_MAP() JF+E.-fy$  
}; y\xa<!:g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ^e 1Ux  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w<0F-0:8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Avc9W[4  
BOOL InitHotkey(); \'BA}v &/  
BOOL UnInit(); "SV#e4C.  
#endif zFq8xw  
Hl3%+f  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. B9&$sTAB  
#include "stdafx.h" q0>@!1Wb  
#include "hook.h" P>i!f!o*I  
#include <windowsx.h> %#zqZ|q  
#ifdef _DEBUG D=0^" 7K  
#define new DEBUG_NEW m"r=p  
#undef THIS_FILE ?_VoO  
static char THIS_FILE[] = __FILE__; 4$wn8!x2|  
#endif ^`MGlI}   
#define MAX_KEY 100 f\{ynC2m  
#define CTRLBIT 0x04 -%g$~MZ?'  
#define ALTBIT 0x02 5g$]ou  
#define SHIFTBIT 0x01 }%@q; "9`  
#pragma data_seg("shareddata") 8}^R jMgI  
HHOOK hHook =NULL; d hp-XIA;  
UINT nHookCount =0; 9Sy|:J0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey h3<L,Olp  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT -!C9x?gNY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey n'42CE  
static int KeyCount =0; 5N_w(B  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift zD9gE  
#pragma data_seg() $r'PYGn  
HINSTANCE hins; <uYeev%  
void VerifyWindow(); 8vK$]e36  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 3Aqw )B'"_  
//{{AFX_MSG_MAP(CHookApp) ^qro0]"LD  
// NOTE - the ClassWizard will add and remove mapping macros here. L2j7w006  
// DO NOT EDIT what you see in these blocks of generated code! G%RL8HU  
//}}AFX_MSG_MAP ,8Yc@P_O  
END_MESSAGE_MAP() 3om_Z/k  
+'@j~\>^yJ  
CHookApp::CHookApp() nc.(bb),  
{ 2jUEL=+Y  
 // TODO: add construction code here, FD+y?UF  
 // Place all significant initialization in InitInstance \?VNr2   
} .:nV^+)  
C~ r(*nr  
CHookApp theApp; NhgzU+)+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TGxmc37?  
{ )yj:P  
 BOOL bProcessed=FALSE; fGz++;b<S  
 if(HC_ACTION==nCode) xX5EhVR   
 { )v+R+3<  
  if((lParam&0xc0000000)==0xc0000000){// Key up _?YP0GpU  
   switch(wParam) #3h~Z)+y  
   { I=DvP;!  
    case VK_MENU: 3`mM0,fY  
     MaskBits&=~ALTBIT; G""L1?  
     break; BS@x&DB  
    case VK_CONTROL: vK10p)ZV  
     MaskBits&=~CTRLBIT; ]DO ~7p[  
     break; e-`=?tct  
    case VK_SHIFT: m,"N 4a@  
     MaskBits&=~SHIFTBIT; @N%/v*  
     break; dh~ cj5  
    default: //judge the key and send message ;GjZvo  
     break; L#}HeOEi[  
   } 8=Z]?D=  
   for(int index=0;index<MAX_KEY;index++){ 6M/*]jLq4  
    if(hCallWnd[index]==NULL) UgBD| ~zu  
     continue; @_L:W1[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q"uP%TN  
    { v[*&@aW0n  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); g:yUZ;U  
     bProcessed=TRUE; 2l YA% n  
    } U^@8ebv  
   } ^G*zFqa+`  
  } 9td[^EB#(h  
  else if((lParam&0xc000ffff)==1){ //Key down #@v$`Df<  
   switch(wParam) GcpAj9  
   { 5J1q]^  
    case VK_MENU: !i dQ-&  
     MaskBits|=ALTBIT; (3[Lz+W.u  
     break; \(.])I>)eh  
    case VK_CONTROL: @8jc|X<A  
     MaskBits|=CTRLBIT; IcDAl~uG  
     break; ="<S1}.  
    case VK_SHIFT: $X;wj5oj  
     MaskBits|=SHIFTBIT; &|% F=/VU  
     break; j0eGg::  
    default: //judge the key and send message rRK^vfoJ`  
     break; v6$ }saTX  
   } OfAh? ^R  
   for(int index=0;index<MAX_KEY;index++) d ~`_;.z  
   { rF*L@HI  
    if(hCallWnd[index]==NULL) D |lm,  
     continue; |rhCQ"H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )= :gO`"D  
    { @ a$HJ:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); TSp;Vr OP  
     bProcessed=TRUE; bTrQ(qp  
    } -2\%?A6L  
   } KkF3E*q\H  
  } \dG#hH4ZD  
  if(!bProcessed){ M.loG4r!  
   for(int index=0;index<MAX_KEY;index++){ V.f'Cw  
    if(hCallWnd[index]==NULL) }Efz+>F 02  
     continue; G9_M~N%a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &E{i#r)'T  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >.fN@8[  
   } >@T(^=Q  
  } uQYBq)p|  
 } xwm-)~L4T  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); QSNLo_z  
} YdT-E  
ndY1j5  
BOOL InitHotkey() *a2 y  
{ 82q_"y>6  
 if(hHook!=NULL){ F[65)"^  
  nHookCount++; FV1!IE-}-  
  return TRUE; [HV9KAoA  
 } q7VpKfA:M  
 else  Du*O|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); EXrOP]Kl  
  if(hHook!=NULL) AVx 0aj  
   nHookCount++; (ru9Ke%Dx  
  return (hHook!=NULL); ?Ww\D8yV&  
} 5ZPe=SQ{  
BOOL UnInit() ;44?`[oP  
{ ,Z"l3~0\  
 if(nHookCount>1){ 7LB#\2  
  nHookCount--; }"{NW!RfP  
  return TRUE; UhX`BGpM{  
 } ti)4J2c,8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); bN',-[E  
 if(unhooked==TRUE){ .).*6{_  
  nHookCount=0; !N:: 1c@C  
  hHook=NULL; 3XeCaq'N  
 } %~ROV>&  
 return unhooked; ST^@7f_  
} d:x=g i!  
}&o*ZY-1  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "E><:_,\  
{ t\p_QWnF  
 BOOL bAdded=FALSE; ua'dm6",:  
 for(int index=0;index<MAX_KEY;index++){ dE _I=v  
  if(hCallWnd[index]==0){ DJF-J#  
   hCallWnd[index]=hWnd; 6J\Yi)v<  
   HotKey[index]=cKey; >;ucwLi  
   HotKeyMask[index]=cMask; c20'{kH  
   bAdded=TRUE; ?b&~(,A{  
   KeyCount++; ,uFdhA(i@'  
   break; E7*z.3  
  } _*.Wo"[%[X  
 } hgz7dF  
 return bAdded; :h|nV ~  
} >#MGGCGL  
Ef}rMkv  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rdL>yT/A  
{ cX64 X  
 BOOL bRemoved=FALSE; Ux2p qPb  
 for(int index=0;index<MAX_KEY;index++){ gda3{g7<)  
  if(hCallWnd[index]==hWnd){ lIN`1vX(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (aO+7ykRuJ  
    hCallWnd[index]=NULL; .-:R mYGR  
    HotKey[index]=0; `GG PkTN  
    HotKeyMask[index]=0; nsq7,%5  
    bRemoved=TRUE; y?|JBf  
    KeyCount--; D/jS4'$vA  
    break; @'K+   
   } e:BKdZGW  
  } 6^L4wd7)  
 } L;},1 \  
 return bRemoved; );$L#XpB  
} *(~=L%s  
uQ;b'6Jcp  
void VerifyWindow() <3!jra,h  
{ )32BM+f"77  
 for(int i=0;i<MAX_KEY;i++){ iG[an*#X  
  if(hCallWnd!=NULL){ JvHGu&Nr!  
   if(!IsWindow(hCallWnd)){ y`~[R7E  
    hCallWnd=NULL; @Y#{[@Hp%  
    HotKey=0; ypuW}H%`  
    HotKeyMask=0; $=j}JX}z  
    KeyCount--; A@@Z?t.  
   } | Wrf|%p  
  } !/w<F{cl  
 } S*o%#ZJN  
} p& > z=Z*  
ak?XE4-N  
BOOL CHookApp::InitInstance() /lQGFLZL  
{ ~PT( /L  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); crJyk#_  
 hins=AfxGetInstanceHandle(); OG_2k3v  
 InitHotkey(); zl: 5_u=T  
 return CWinApp::InitInstance(); W*hRYgaX3  
} c%uX+\-$  
`]^JOw5o  
int CHookApp::ExitInstance() eeuTf  
{ %#rH~E  
 VerifyWindow(); 3N) bJ  
 UnInit(); 3B(6^iS  
 return CWinApp::ExitInstance(); Og`6>?>97  
} zL @ZNH  
pZ/aZg1Ld  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file S-"&#OfWg<  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +_8*;k@F'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bP`.teO\  
#if _MSC_VER > 1000 mis cmD  
#pragma once /\-qz$  
#endif // _MSC_VER > 1000 -Fodqq@,  
_u^ S[  
class CCaptureDlg : public CDialog 05zBB  
{ i;1aobG  
 // Construction  R1YRqk  
 public: \e5bxc  
  BOOL bTray; `0tzQ>ZQq  
  BOOL bRegistered; TR8<=  
  BOOL RegisterHotkey(); {XMF26C#  
  UCHAR cKey; /++CwRz@Gm  
  UCHAR cMask; @)>9l&  
  void DeleteIcon(); m<>3GF,5bP  
  void AddIcon(); 2 $^n@<uZ@  
  UINT nCount; s%nx8"   
  void SaveBmp(); 8_MR7'C1hi  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ~+{OSx<S  
  // Dialog Data 7m6@]S6  
  //{{AFX_DATA(CCaptureDlg) 'AX/?Srd  
  enum { IDD = IDD_CAPTURE_DIALOG }; +$:bzo_u  
  CComboBox m_Key; CT@JNG$<"  
  BOOL m_bControl; .kSx>3  
  BOOL m_bAlt; 6@-VLO))O  
  BOOL m_bShift; Kr!(<i  
  CString m_Path; 0xVue[ep  
  CString m_Number; s[ |sfqB1`  
  //}}AFX_DATA vMsb@@O\\  
  // ClassWizard generated virtual function overrides \gRX:i#n  
  //{{AFX_VIRTUAL(CCaptureDlg) ( w(GJ/g  
 public: 3 T$gT  
  virtual BOOL PreTranslateMessage(MSG* pMsg); i0 ax`37  
 protected: p4;A[2Ot`:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W8Z&J18AU  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9 ve q  
  //}}AFX_VIRTUAL 7hq*+e  
  // Implementation 6 6x> *  
 protected: +A 6xY  
  HICON m_hIcon; hPhNDmL#3  
  // Generated message map functions `MAluu+b  
  //{{AFX_MSG(CCaptureDlg) >-YPCW  
  virtual BOOL OnInitDialog(); CwQgA%) !i  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); d]0.6T1[K  
  afx_msg void OnPaint(); )6#dxb9  
  afx_msg HCURSOR OnQueryDragIcon(); e%w>QN`  
  virtual void OnCancel(); ~y%8uHL:  
  afx_msg void OnAbout(); <N11$t&_  
  afx_msg void OnBrowse(); "q(#,,_  
  afx_msg void OnChange(); klduJ T >  
 //}}AFX_MSG ID" '`DKxe  
 DECLARE_MESSAGE_MAP() wSHE~Xx  
}; )A9K9pZj  
#endif D.H$4[u;j  
UH1AT#?!W  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @~0kSA7  
#include "stdafx.h" 9"g=it2Rh6  
#include "Capture.h" ,vEwck#  
#include "CaptureDlg.h" .7TQae%  
#include <windowsx.h> > $0eRVL  
#pragma comment(lib,"hook.lib") "ZDc$v:Qa  
#ifdef _DEBUG N.OC _H&  
#define new DEBUG_NEW o0b}:`  
#undef THIS_FILE /238pg~Cw5  
static char THIS_FILE[] = __FILE__; RKsr}-1 8  
#endif ?y82S*sb#  
#define IDM_SHELL WM_USER+1 PDaHY  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); eOa:%{Kj  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l/,O9ur-  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U`_(Lq%5W  
class CAboutDlg : public CDialog ,.tv#j|A  
{ YB/A0J  
 public: ooY2"\o  
  CAboutDlg(); Tx%6whd/'  
  // Dialog Data &K5wCNX1  
  //{{AFX_DATA(CAboutDlg) 1\:puC\)  
  enum { IDD = IDD_ABOUTBOX }; R{.5Z/Vp6E  
  //}}AFX_DATA Fx2z lM&  
  // ClassWizard generated virtual function overrides >VnkgY  
  //{{AFX_VIRTUAL(CAboutDlg) _Z'j%/-4@D  
 protected: } )O ^xF ~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support W!pLk/|ls  
  //}}AFX_VIRTUAL <Y9vc:S  
  // Implementation 0UeDM*  
 protected: SovK|b &  
  //{{AFX_MSG(CAboutDlg) YRF%].A%2  
  //}}AFX_MSG '+ 1<7jl&I  
  DECLARE_MESSAGE_MAP() s0"S;{_#  
}; r+fR^hv  
=D.M}x qo  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) :nYl]Rm  
{ #W,BUN}  
 //{{AFX_DATA_INIT(CAboutDlg) ^& ZlV  
 //}}AFX_DATA_INIT ab8uY.j  
} *[jG^w0z8~  
VyH'7_aU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) y6ntGrZ}$  
{ ^OKCvdS  
 CDialog::DoDataExchange(pDX); Ql sMMIax  
 //{{AFX_DATA_MAP(CAboutDlg) xg %EQ  
 //}}AFX_DATA_MAP M7BCBA  
} XYIZ^_My  
[8AGW7_  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |i'V\" hW  
 //{{AFX_MSG_MAP(CAboutDlg) ''S*B|:  
 // No message handlers 4`5jq)  
 //}}AFX_MSG_MAP Jr m<u t  
END_MESSAGE_MAP() AVyO5>w  
vR<Y1<j  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) I`kaAOe  
: CDialog(CCaptureDlg::IDD, pParent) Bsi HVr  
{ Xk%92Pto  
 //{{AFX_DATA_INIT(CCaptureDlg) VH7VJ [  
  m_bControl = FALSE; #y13(u,dN  
  m_bAlt = FALSE; iLw O4i  
  m_bShift = FALSE;  $6w[h7  
  m_Path = _T("c:\\"); !qPVC\l  
  m_Number = _T("0 picture captured."); YlD ui8.N  
  nCount=0; /gT$d2{  
  bRegistered=FALSE; 44 ,:@  
  bTray=FALSE; mw)KyU#l,:  
 //}}AFX_DATA_INIT s@sRdoTdF  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !K^.r_0H.  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); IBWUXG;  
} s 7re  
K.c6n,'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8<ZxE(v  
{ q y73  
 CDialog::DoDataExchange(pDX); 57IAH$n8o  
 //{{AFX_DATA_MAP(CCaptureDlg) ^c3~CD5H 3  
  DDX_Control(pDX, IDC_KEY, m_Key); 6KPM4#61o  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); :5hKE(3Q  
  DDX_Check(pDX, IDC_ALT, m_bAlt); '&,$"QXwE  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); e eb`Ao  
  DDX_Text(pDX, IDC_PATH, m_Path); ,R/HT@  
  DDX_Text(pDX, IDC_NUMBER, m_Number); r4/G&m[V  
 //}}AFX_DATA_MAP p x1y#Q  
} 0FmYM@Wc  
3Z#k9c_b  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) WGFp<R  
//{{AFX_MSG_MAP(CCaptureDlg) {pMbkA Q@  
 ON_WM_SYSCOMMAND() hI*gw3V  
 ON_WM_PAINT() j|"#S4IX)F  
 ON_WM_QUERYDRAGICON() |F z/9+I  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) fH? e9E4l  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 5BnO-[3  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (@*[^@ipV  
//}}AFX_MSG_MAP >2l1t}"\  
END_MESSAGE_MAP() 5Z/xY &  
c'nEbelE  
BOOL CCaptureDlg::OnInitDialog() /tI8JXcUK  
{ O@r%G0Jge  
 CDialog::OnInitDialog(); UN#XP$utY  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .g71?^?(  
 ASSERT(IDM_ABOUTBOX < 0xF000); lPyGL-Q  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .&dW?HS  
 if (pSysMenu != NULL) oLK-~[p  
 { f tW-  
  CString strAboutMenu; )8]O|Z-CU  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]vRte!QJ;  
  if (!strAboutMenu.IsEmpty()) rC.z772y%  
  { {/`iZzPg  
   pSysMenu->AppendMenu(MF_SEPARATOR); I$!rNfrs  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `>&V_^y+  
  } a;JB8  
 } (A(7?eq  
 SetIcon(m_hIcon, TRUE); // Set big icon !_CBf#0  
 SetIcon(m_hIcon, FALSE); // Set small icon 3Ob"R%Yo  
 m_Key.SetCurSel(0); vI3L <[W  
 RegisterHotkey(); i"mN0%   
 CMenu* pMenu=GetSystemMenu(FALSE); i[1K~yXq:  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a^_\#,}  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); %suSZw`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6L[Yn?;  
 return TRUE; // return TRUE unless you set the focus to a control UFBggT\  
} SV#$Cf g  
 734)s  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d_s=5+Yj  
{ X!Ag7^E  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) P{j2'gg3  
 { g&eIfm  
  CAboutDlg dlgAbout; ~t7?5b?*\  
  dlgAbout.DoModal(); `|?K4<5|  
 } )90Q  
 else C3q}Dh+]  
 { Qgx9JJ>  
  CDialog::OnSysCommand(nID, lParam); 9IJBK  
 } R6l`IlG`  
} A;ip V :)  
5(RFk Zn4[  
void CCaptureDlg::OnPaint() jMv qKJ(<  
{ -|;{/ s5  
 if (IsIconic()) -xs @rV`  
 { q5C(/@)^  
  CPaintDC dc(this); // device context for painting <QbD ;(%  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Kn-cwz5  
  // Center icon in client rectangle "ee:Z_Sz  
  int cxIcon = GetSystemMetrics(SM_CXICON); ybLl[K(D=  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2F* spu  
  CRect rect; 278:5yC  
  GetClientRect(&rect); 3cfJ(%'X  
  int x = (rect.Width() - cxIcon + 1) / 2; 4/UY*Us&  
  int y = (rect.Height() - cyIcon + 1) / 2; Wno{&I63  
  // Draw the icon (;DnL|"'8  
  dc.DrawIcon(x, y, m_hIcon); lId}sf   
 } }ie  O  
 else  `{w.OK  
 { #1fT\aP  
  CDialog::OnPaint(); j}9][Fm1*  
 } {l$DNnS  
} /)RyRS8c  
ILi{5L  
HCURSOR CCaptureDlg::OnQueryDragIcon() FW* k O  
{ =rSJ6'2("  
 return (HCURSOR) m_hIcon; SFhi]48&V  
} |@'/F#T  
5cj]Y)I-~  
void CCaptureDlg::OnCancel() }AfX0[!O  
{ qw^kA?  
 if(bTray) cGF_|1`  
  DeleteIcon(); 7#/->Y  
  CDialog::OnCancel(); a#3+PB #  
} Ws;S=|9,7~  
(gW#T\Eln  
void CCaptureDlg::OnAbout() wW2b?b{*Z  
{ "&h{+DHS  
 CAboutDlg dlg; co!o+jP  
 dlg.DoModal(); l0Rjq*5hJ  
} aumWU{j=  
}%e"A4v  
void CCaptureDlg::OnBrowse() \S #Mc  
{ &1nZ%J9  
 CString str; z+3G zDLy  
 BROWSEINFO bi; HURr k~[  
 char name[MAX_PATH]; iCd$gwA>F  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ^a+W!  
 bi.hwndOwner=GetSafeHwnd(); MnToL@  
 bi.pszDisplayName=name; F)fCj^ zL  
 bi.lpszTitle="Select folder"; K4w %XVaH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; FPAy.cljJ  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); `FS)i7-o6  
 if(idl==NULL) ?\ Fo|__  
  return; yFt$L'#  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); >O0z+tj  
 str.ReleaseBuffer(); N RB>X  
 m_Path=str; T''PzY!Qf  
 if(str.GetAt(str.GetLength()-1)!='\\') wXUP%i]i=  
  m_Path+="\\"; O*qSc^9q  
 UpdateData(FALSE); Ml-GAkgG  
} +]?/c>M  
\iN3/J4  
void CCaptureDlg::SaveBmp() Buxn!s  
{ ?a)X)#lQ  
 CDC dc; aTi2=HL=S  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ,orq&#*Wd  
 CBitmap bm; kT7x !7C  
 int Width=GetSystemMetrics(SM_CXSCREEN); YoC{ t&rY  
 int Height=GetSystemMetrics(SM_CYSCREEN); Cn\5Vyrl  
 bm.CreateCompatibleBitmap(&dc,Width,Height); h>0R!Rl8  
 CDC tdc; op!ft/Yyb  
 tdc.CreateCompatibleDC(&dc); :vsBobiJ  
 CBitmap*pOld=tdc.SelectObject(&bm); |:qaF  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Tt^PiaS!  
 tdc.SelectObject(pOld); o 8fB  
 BITMAP btm; XFj\H(D  
 bm.GetBitmap(&btm);  3)D'Yx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; o`tOnwt  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); FE'|wf  
 BITMAPINFOHEADER bih; .>X 0 $#  
 bih.biBitCount=btm.bmBitsPixel; @^q|C&j  
 bih.biClrImportant=0; ;i;2cq  
 bih.biClrUsed=0; ucP"<,a  
 bih.biCompression=0; <H; z4  
 bih.biHeight=btm.bmHeight; tr[(,kX  
 bih.biPlanes=1; mBAI";L3  
 bih.biSize=sizeof(BITMAPINFOHEADER); aL)}S%5o?  
 bih.biSizeImage=size; [nSlkl   
 bih.biWidth=btm.bmWidth; B7'rbc'  
 bih.biXPelsPerMeter=0; f{i~hVF  
 bih.biYPelsPerMeter=0; 2Ra}&ie  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5Q/&,NP  
 static int filecount=0; !UzMuGj  
 CString name; p* '%<3ml  
 name.Format("pict%04d.bmp",filecount++); Wi;wu*  
 name=m_Path+name; )Bz2-|\  
 BITMAPFILEHEADER bfh; /5**2Kgv1  
 bfh.bfReserved1=bfh.bfReserved2=0; DJWm7 t  
 bfh.bfType=((WORD)('M'<< 8)|'B'); k 4HE'WY  
 bfh.bfSize=54+size; S*aMUV&  
 bfh.bfOffBits=54; \r.{Ru  
 CFile bf; 0fOx&"UAB  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ DfPC@` k  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h4iz(*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Y5dt/8Jo  
  bf.WriteHuge(lpData,size); \OzPDN  
  bf.Close(); [ClDKswq  
  nCount++; 2`Dqu"TWh  
 } H$@5\pP>  
 GlobalFreePtr(lpData); E%.w6-  
 if(nCount==1) i(Xz3L#(  
  m_Number.Format("%d picture captured.",nCount); v0aV>-v  
 else wI0NotC  
  m_Number.Format("%d pictures captured.",nCount); "r+v^  
  UpdateData(FALSE); tfAO#htq  
} R>C^duos.  
<2.87:  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DqH?:`G  
{ d*B^pDf  
 if(pMsg -> message == WM_KEYDOWN) *UerLpf  
 { W{El^')F  
  if(pMsg -> wParam == VK_ESCAPE) ^Rpy5/d  
   return TRUE; 4uX|2nJ2!;  
  if(pMsg -> wParam == VK_RETURN) 8\lRP,-  
   return TRUE; mJ #|~I*Z-  
 }  /# FU"  
 return CDialog::PreTranslateMessage(pMsg); NMy+=GZu^  
} -%G}T}"_  
t| cL!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) If*+yr|  
{ qH=<8Iu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ )01,3J>#  
  SaveBmp(); ^ UDNp.6k  
  return FALSE; u4KP;_,m  
} #$dEg  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ !T|q/ri  
 CMenu pop; X]1Q# $b  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }Sx+:N*  
 CMenu*pMenu=pop.GetSubMenu(0); uHQf<R$:  
 pMenu->SetDefaultItem(ID_EXITICON); u3k{s  
 CPoint pt; W"meH~[Cp  
 GetCursorPos(&pt); Gi+ZI{)  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); <i$ud&D  
 if(id==ID_EXITICON)  ob_*fP  
  DeleteIcon(); pYBY"r  
 else if(id==ID_EXIT) c e\|eN[  
  OnCancel(); 6Trtulm  
 return FALSE; !H^e$BA  
} T?4I\SG  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); LkwjEJQf  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sX c|++  
 AddIcon(); h>:eu#  
 return res; 3UNmUDl[~  
} dI%#cf1  
S|Yz5)*  
void CCaptureDlg::AddIcon() =>m x>R`S  
{ ~Qm<w3oy  
 NOTIFYICONDATA data; nYb{?{_ca8  
 data.cbSize=sizeof(NOTIFYICONDATA); e h6\y7 9g  
 CString tip; v1`*}.#  
 tip.LoadString(IDS_ICONTIP); + t JEG:  
 data.hIcon=GetIcon(0); /@O$jlX5I  
 data.hWnd=GetSafeHwnd(); -tH^Deo  
 strcpy(data.szTip,tip); GF/!@N  
 data.uCallbackMessage=IDM_SHELL; i.5?b/l0  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8q/3}AnI  
 data.uID=98; S)\Yc=~h  
 Shell_NotifyIcon(NIM_ADD,&data); L#~z#  
 ShowWindow(SW_HIDE); w|G4c^KH  
 bTray=TRUE; 4Q?3gA1  
} ?.~hex#M@  
= lMs1}S9  
void CCaptureDlg::DeleteIcon() T*"*##c  
{ LcW:vV|'K  
 NOTIFYICONDATA data; 7Ap==J{a  
 data.cbSize=sizeof(NOTIFYICONDATA); xV\mS+#  
 data.hWnd=GetSafeHwnd(); 50R&;+b  
 data.uID=98; O?OG`{k  
 Shell_NotifyIcon(NIM_DELETE,&data); U?e.)G  
 ShowWindow(SW_SHOW); $v\o14 v  
 SetForegroundWindow(); !?aL_{7J  
 ShowWindow(SW_SHOWNORMAL);  K?]c  
 bTray=FALSE; @x[Arx^?}  
} :$f9(f&  
nsjrzO79L8  
void CCaptureDlg::OnChange() 2_C&p6VGj  
{ n:P++^ j  
 RegisterHotkey(); Ap)pOD7  
} =}1m.  
OaF[t*]D3  
BOOL CCaptureDlg::RegisterHotkey() s;Sv@=\  
{ EHlkt,h*  
 UpdateData(); W&s@2y?rF  
 UCHAR mask=0; wqE+hKs,  
 UCHAR key=0; _!C M  
 if(m_bControl) (> VD#n  
  mask|=4; 5tUN'KEbN  
 if(m_bAlt) ,xOOR   
  mask|=2; 2od 9Q=v~  
 if(m_bShift) vD91t/_+  
  mask|=1; iZ; y(  
  key=Key_Table[m_Key.GetCurSel()]; m[$pj~<\  
 if(bRegistered){ %<yH6h*u  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1MYA/l$  
  bRegistered=FALSE; TO]7%aB  
 } +AkMU|6  
 cMask=mask; bPMkBm  
 cKey=key; gbr-C  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); -P>up)p  
 return bRegistered; VI(2/**  
} *U:0c ;h  
!wr2OxK*  
  四、小结 H+?@LPV*N  
ykBq?Vr  
  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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