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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: ?(PKeq6  
  y2v^-q3  
  一、实现方法 VQs5"K"  
C}X\|J  
  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: #QPjk R|\  
qLCR] _*  
#pragma data_seg("shareddata") 2|,VqVb  
HHOOK hHook =NULL; //钩子句柄 DqPw#<"H  
UINT nHookCount =0; //挂接的程序数目 !<oe=)Iz|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 TseGXYH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~@!bsLSMU  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey *#2h/Q.  
static int KeyCount =0; j+!v}*I![  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9ati`-y2  
#pragma data_seg() ~[ F`"  
)1z@  
  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。 pw#-_  
@L`jk+Y0vF  
  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: G5!^*jf  
RNL9>7xV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR )_:NLo:  
cKey,UCHAR cMask) 6LZCgdS{  
{ H+#FSdy#  
 BOOL bAdded=FALSE; t7pFW^&  
 for(int index=0;index<MAX_KEY;index++){ C^){.UGmJ  
  if(hCallWnd[index]==0){ /}$+uBgJm  
   hCallWnd[index]=hWnd; hb-%_c"kq  
   HotKey[index]=cKey; TzZq(? V  
   HotKeyMask[index]=cMask; b$7 +;I;  
   bAdded=TRUE; IgzQr >  
   KeyCount++; 3R/bz0 V>  
   break; 'R)Tn!6  
  } KoRV %@I  
 }  \*da6Am  
 return bAdded; 0_/[k*Re  
} y} '@R$  
//删除热键 2!\D PX  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JC"z&ka  
{ eE Kf|I  
 BOOL bRemoved=FALSE; K:M8h{Ua  
 for(int index=0;index<MAX_KEY;index++){ =D(j)<9$A  
  if(hCallWnd[index]==hWnd){ m~|40)   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0J|3kY-n>  
    hCallWnd[index]=NULL; cK@wsA^4  
    HotKey[index]=0; )+^+s d  
    HotKeyMask[index]=0; ?0.NIu,,o  
    bRemoved=TRUE; +3gp%`c4  
    KeyCount--; =wJX 0A|  
    break; K"6vXv4QO  
   } iscz}E,Y  
  } `V1]k_h  
 } sA~]$A;DM!  
 return bRemoved; mq l Z?-  
} Ef\ -VKh  
hP h-+Hb  
\['Cj*ek  
  DLL中的钩子函数如下: nTas~~Q  
#_1`)VS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )BE1Q*= n  
{ '"^'MXa  
 BOOL bProcessed=FALSE; (:_$5&i7  
 if(HC_ACTION==nCode) kM 6 Qp  
 { NbobliC=  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 e.>P8C<&  
   switch(wParam) #E[0ys1O  
   {  9?$i?  
    case VK_MENU: (Z*!#}z`  
     MaskBits&=~ALTBIT; .`lCWeHN  
     break; 6863xOv{T  
    case VK_CONTROL: 1oS/`)  
     MaskBits&=~CTRLBIT; h8P)%p  
     break; M}a6Vu9  
    case VK_SHIFT: ?[AD=rUC  
     MaskBits&=~SHIFTBIT; 0sqFF[i  
     break; >z03{=sAN  
    default: //judge the key and send message ]]mJ']l  
     break; qM`}{ /i  
   } x:;kSh  
   for(int index=0;index<MAX_KEY;index++){ ,}PgOJZ  
    if(hCallWnd[index]==NULL) a#4?cEy  
     continue; bOB \--:]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _#niyW+?~  
    { do%&m]#;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); IPk4 ;,  
     bProcessed=TRUE; .H|-_~Yx|  
    } *|0 -~u%q  
   } j.Hf/vi`z  
  } +0&/g&a\R  
  else if((lParam&0xc000ffff)==1){ //有键按下 osRy e3  
   switch(wParam) 2T35{Q!=F  
   { eavV?\uV%  
    case VK_MENU: . vV|hSc  
     MaskBits|=ALTBIT; |=w@H]r  
     break; f 2.HF@  
    case VK_CONTROL:  \zkg  
     MaskBits|=CTRLBIT; @- xjfC\d  
     break; ^ y::jK  
    case VK_SHIFT: G2D$aSh  
     MaskBits|=SHIFTBIT; ,hVli/  
     break; %A`+WYeuX  
    default: //judge the key and send message paK2 xX8E  
     break; l;Wj]  
   } +2{Lh7Ks  
   for(int index=0;index<MAX_KEY;index++){ vQCy\Gi   
    if(hCallWnd[index]==NULL) u[YGm:}  
     continue; gJXaPJA{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UfGkTwoo=  
    { \~W'v3:W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); f8~_E  
     bProcessed=TRUE;  @5FQX  
    } u_enqC3  
   } !a`&O-ye  
  } Sc0w.5m6  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 HtFDlvdy]  
   for(int index=0;index<MAX_KEY;index++){ 0S"MC9beg  
    if(hCallWnd[index]==NULL) ;I}fBZ 3  
     continue; b=vkiO`2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 6Oq 7#3]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Vk suu@cch  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 mt .sucT  
   } vN:Ng  
  } s<Ziegmw|g  
 } hb$Ce'}N  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;u JMG  
} ?4,T}@P  
j%kncGS  
  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: h{Y",7] !  
e+WNk 2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?< +WG/(d  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >Tgv11[  
5! {D!  
  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: 4Z*/WsCv  
4x34u}l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]^E?;1$f?  
{ G{}VPcrbC  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0J9x9j`&j  
 { P:c w|Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 M3\AY30L  
  SaveBmp(); 54 T`OE =  
  return FALSE; /m1\iM\  
 } zX[U~.  
 …… //其它处理及默认处理 ';CNGv -  
} 0mE 0 j  
pBHRa?Y5  
x5Bk/e'  
  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。 3og.y+.=U.  
ZK,G v  
  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。 6P3*Z  
oJ^P(]dw  
  二、编程步骤 X ?O[r3<  
@d'j zs  
  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"; H_a[)DT  
zhQJy?>'m  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 7!1S)dup  
3] Ct6  
  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; (PL UFT  
?<!|  
  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; oH@78D0A  
|yCMt:Hk  
  5、 添加代码,编译运行程序。 6k%f  
e~OpofJNb  
三、程序代码 2y4bwi  
*dQSw)R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ES[G  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f*Hr^b}`8  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ z{ dEC %  
#if _MSC_VER > 1000 &C}*w2]0S  
#pragma once =_CzH(=f#  
#endif // _MSC_VER > 1000 "oyo#-5z  
#ifndef __AFXWIN_H__  wwqEl(  
#error include 'stdafx.h' before including this file for PCH Wtnfa{gP%  
#endif F?0Ykjh3  
#include "resource.h" // main symbols OUnA;_  
class CHookApp : public CWinApp pa+hL,w{6  
{ :OT&  
 public: M\j.8jG  
  CHookApp(); _ q"Gix  
  // Overrides c<~H(k'+c  
  // ClassWizard generated virtual function overrides 6tZI["\   
  //{{AFX_VIRTUAL(CHookApp) ! nx{ X  
 public: 0GLM(JmK  
  virtual BOOL InitInstance(); Gv&V|7-f0  
  virtual int ExitInstance(); Eci\a]  
  //}}AFX_VIRTUAL P55fL-vo|}  
  //{{AFX_MSG(CHookApp) >P(.:_ ^p  
  // NOTE - the ClassWizard will add and remove member functions here. kh<2BOV  
  // DO NOT EDIT what you see in these blocks of generated code ! F4QVAOM]U  
  //}}AFX_MSG (3e 2c  
  DECLARE_MESSAGE_MAP() kJU2C=m@e2  
};  " bG2:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); PT ~D",k  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G@0&8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;uW FHc5@B  
BOOL InitHotkey(); gYj'(jB  
BOOL UnInit(); hH.G#-JO  
#endif BtZyn7a  
GgU/ !@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. g(g& TO  
#include "stdafx.h" [g,}gyeS(  
#include "hook.h" !D6]JPX  
#include <windowsx.h> qs6aB0ln  
#ifdef _DEBUG 3|7QU ld  
#define new DEBUG_NEW %<5'=t'|-U  
#undef THIS_FILE |Tw~@kT@  
static char THIS_FILE[] = __FILE__; AA_%<zK  
#endif 7)m9"InDI  
#define MAX_KEY 100 b>k y  
#define CTRLBIT 0x04 M|-)GvR$J  
#define ALTBIT 0x02 N`i/mP  
#define SHIFTBIT 0x01 fA-7VdR`R  
#pragma data_seg("shareddata") KoYF]  
HHOOK hHook =NULL; pAEx#ck  
UINT nHookCount =0; ~[: 2I  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey t^HRgY'NjM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *j=% #  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey GbyJ:  
static int KeyCount =0; Ac6=(B  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift %y@AA>x!  
#pragma data_seg() g0H[*"hj  
HINSTANCE hins; 'qi}|I  
void VerifyWindow(); P>L +t`'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 58K5ZZG  
//{{AFX_MSG_MAP(CHookApp) RSds8\tk  
// NOTE - the ClassWizard will add and remove mapping macros here. )jj0^f1!j  
// DO NOT EDIT what you see in these blocks of generated code! J,G lIv.A  
//}}AFX_MSG_MAP QJNFA}*>  
END_MESSAGE_MAP() mOSv9w#,  
V~bD)?M  
CHookApp::CHookApp() X]=t>   
{ ;<5q]/IHK  
 // TODO: add construction code here, R]dg_Da  
 // Place all significant initialization in InitInstance d-m7 }2c  
} l:%GH  
0YzpZW"+  
CHookApp theApp; V)^+?B)T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +p^u^a  
{ neh(<>  
 BOOL bProcessed=FALSE; "b[5]Y{ U  
 if(HC_ACTION==nCode) l, wp4 Ll  
 { !wNO8;(  
  if((lParam&0xc0000000)==0xc0000000){// Key up l2d{ 73h  
   switch(wParam) l0] EX>"E  
   { 4 :=]<sc,  
    case VK_MENU: a?.=V  
     MaskBits&=~ALTBIT; @;kSx":b  
     break; |}1dFp  
    case VK_CONTROL: hph4`{T  
     MaskBits&=~CTRLBIT; h![#;>(  
     break; f?b"iA(6  
    case VK_SHIFT: P2!C|SLK  
     MaskBits&=~SHIFTBIT; zX~MC?,W1  
     break; l,: F  
    default: //judge the key and send message Q&&@v4L   
     break; m* ;ERK  
   } v:p}B$  
   for(int index=0;index<MAX_KEY;index++){ g>sSS8R O  
    if(hCallWnd[index]==NULL) z2c6T.1M  
     continue; z~Q)/d,Ac  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *A< 5*Db:F  
    { ckn~#UE=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5uf a  
     bProcessed=TRUE; DMS! a$4  
    } *H122njH+T  
   } F/Pep?'  
  } _U0f=m  
  else if((lParam&0xc000ffff)==1){ //Key down 1}37Q&2  
   switch(wParam) >+waX "e  
   { cAy3^{3:  
    case VK_MENU: _6Ha  
     MaskBits|=ALTBIT; 9kojLqCT  
     break; 7KPwQ?SjT  
    case VK_CONTROL: 3F0 N^)@  
     MaskBits|=CTRLBIT; V1?]|HTQcT  
     break; kLY^!  
    case VK_SHIFT: ca}2TT&t  
     MaskBits|=SHIFTBIT; -+5>|N#  
     break; Tr|JYLwF  
    default: //judge the key and send message FqifriLN  
     break; i?gSC<a  
   } ExM,g'7  
   for(int index=0;index<MAX_KEY;index++) ^GX)Z~  
   { {U1m.30n  
    if(hCallWnd[index]==NULL) kl,3IKHa  
     continue; nd(S3rct&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cFv8 Od  
    { <X5 fUU"+U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8] ikygt"  
     bProcessed=TRUE; KU;9}!#  
    } gJhiGYx  
   } 2[CdZ(k]5  
  } >Se,;cB'/]  
  if(!bProcessed){ &0f,~ /%Z  
   for(int index=0;index<MAX_KEY;index++){ `"~%bS  
    if(hCallWnd[index]==NULL) N<-Gk6`C/  
     continue; `lPfb[b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Q,9oKg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s{" 2L{,$  
   } x m@_IL&P  
  } s@DLt+ O5  
 } N&pCx&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !a<ng&H^U  
} 6R5Qy]]E  
LK"69Qx?5q  
BOOL InitHotkey() 7)k\{&+P  
{ -(#iIgmP  
 if(hHook!=NULL){ #,.Hr#3nI  
  nHookCount++; ]fD} ^s3G  
  return TRUE; h} EPnC}  
 } @R  6@]Dm  
 else _l]fkk[T  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); B]$GSEB  
  if(hHook!=NULL) N!|wo:  
   nHookCount++; `p7=t)5k  
  return (hHook!=NULL); A4ygW:  
} ""D 4s  
BOOL UnInit() &w~d_</  
{ L^Fy#p  
 if(nHookCount>1){ h*Pc=/p  
  nHookCount--; 6DWgl$[[  
  return TRUE; #u + v_  
 } 7`YEH2  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,u g@f-T  
 if(unhooked==TRUE){ }{< '8J.R  
  nHookCount=0; _7)n(1h[3b  
  hHook=NULL; z"4~P3>{g  
 } orvp*F{7[H  
 return unhooked; ;ZG\p TCA  
} &=k,?TJO>  
G/mXq-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `V3Fx{  
{ 4NIRmDEd  
 BOOL bAdded=FALSE; S@ f9c  
 for(int index=0;index<MAX_KEY;index++){ {vO9p tR;  
  if(hCallWnd[index]==0){ RAK-UN  
   hCallWnd[index]=hWnd; +&"zU GTIc  
   HotKey[index]=cKey; }-3mPy(*%  
   HotKeyMask[index]=cMask; Uv~QUL3>  
   bAdded=TRUE; T"}vAG( .O  
   KeyCount++; |B2+{@R  
   break; Z*2Vpnqh\  
  } TvQo?  
 } qcGK2Qx  
 return bAdded; f f1c/c/  
} ',4iFuY  
K!]/(V(}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *r% c  
{ 6B ?twh)  
 BOOL bRemoved=FALSE; <V6VMYXY4  
 for(int index=0;index<MAX_KEY;index++){ uL/m u<  
  if(hCallWnd[index]==hWnd){ FjI`uP  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ D{~fDRR  
    hCallWnd[index]=NULL; $"&{aa  
    HotKey[index]=0; M[112%[+4  
    HotKeyMask[index]=0; `I5wV/%ib  
    bRemoved=TRUE; mS~kJy_-  
    KeyCount--; :Qf '2.h)  
    break; }XM(:|8J,  
   } `%Al>u5  
  } @[i4^  
 } Q({ r@*g  
 return bRemoved; VgC2+APg  
} xLZG:^(I  
:'&brp3ii=  
void VerifyWindow() B i<Q=x'Z;  
{ JOim3(5?s  
 for(int i=0;i<MAX_KEY;i++){ usL* x9i  
  if(hCallWnd!=NULL){ {Z5nGG  
   if(!IsWindow(hCallWnd)){ y e? 'Ze  
    hCallWnd=NULL;  A4<Uu~  
    HotKey=0; 4^OY C  
    HotKeyMask=0; TSWM |#u':  
    KeyCount--; YNj`W1  
   } =;&yd';k  
  } @)&=%  
 } ;<2 G  
} e?ly H  
EJ:%}HhA  
BOOL CHookApp::InitInstance() jc f #6   
{ ]Y8<`;8/  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); #@~+HC=  
 hins=AfxGetInstanceHandle(); _ T):G6C8  
 InitHotkey(); Zt.|oYH$  
 return CWinApp::InitInstance(); o/Q;f@  
} s '\Uap  
-f>%+<k=  
int CHookApp::ExitInstance()  J@Q7p}  
{ C"T;Qp~B  
 VerifyWindow(); Nyj( 0W  
 UnInit(); Y@ksQ_u  
 return CWinApp::ExitInstance(); qd)/9*|Jl  
} krvp&+uX  
I\[_9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |! E)GahM  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :'l^kSP_*C  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ thM4vq   
#if _MSC_VER > 1000 D"?fn<2  
#pragma once r^a7MHY1  
#endif // _MSC_VER > 1000 $LFYoovX  
g($DdKc|g  
class CCaptureDlg : public CDialog '>0fWBs  
{ <drODjB  
 // Construction 8tFoN*M  
 public: jesGV<`?l  
  BOOL bTray; Rt!FPoN,y  
  BOOL bRegistered; m6CI{Sa](l  
  BOOL RegisterHotkey(); @A89eZbW  
  UCHAR cKey; <\ :Yk  
  UCHAR cMask; gPsi  
  void DeleteIcon(); (l- ab2'  
  void AddIcon(); UsQ+`\|  
  UINT nCount; H'HA+q  
  void SaveBmp(); q $tUH)0  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor j=aI9p  
  // Dialog Data (#RHB`h5  
  //{{AFX_DATA(CCaptureDlg) QYjsDL><  
  enum { IDD = IDD_CAPTURE_DIALOG }; pd;br8yE$@  
  CComboBox m_Key; i?g5_HI  
  BOOL m_bControl; K&70{r  
  BOOL m_bAlt; k!HK 97qA  
  BOOL m_bShift; )ZqTwEr@[  
  CString m_Path; $5< #n@  
  CString m_Number; $#S&QHyEe  
  //}}AFX_DATA b+6\JE^Mz  
  // ClassWizard generated virtual function overrides A '5,LfTu  
  //{{AFX_VIRTUAL(CCaptureDlg) DYxCQ D  
 public: ZR]25Yy  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )~] (&  
 protected: NzOo0tz:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support IS 2^g>T#1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); '~&X wZ&  
  //}}AFX_VIRTUAL DSk/q-'u  
  // Implementation F,dx2ZPIs?  
 protected: 5^lxj~ F  
  HICON m_hIcon; V7P&%oz{C  
  // Generated message map functions au=o6WRa  
  //{{AFX_MSG(CCaptureDlg) C=It* j55  
  virtual BOOL OnInitDialog(); 7/f3Z 1g  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ~ZEmULKkR  
  afx_msg void OnPaint(); Q[pV!CH  
  afx_msg HCURSOR OnQueryDragIcon(); /bi[ e9R  
  virtual void OnCancel(); \LppYXz  
  afx_msg void OnAbout(); L=8<B=QT$  
  afx_msg void OnBrowse(); U`d5vEhT  
  afx_msg void OnChange(); 27"%"P.1  
 //}}AFX_MSG "C SC  
 DECLARE_MESSAGE_MAP() B$!)YD;  
}; ?$^2Umt 0  
#endif -Sx\Xi"<o=  
a]/>ra5{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file vbBc}G"w  
#include "stdafx.h" FCuB\ Q  
#include "Capture.h" \r,Q1n?7  
#include "CaptureDlg.h" Rh{zH~oZ  
#include <windowsx.h> 7-T{a<g  
#pragma comment(lib,"hook.lib") A1#%`^W9  
#ifdef _DEBUG #+5pgD2C  
#define new DEBUG_NEW MLWM&cFG  
#undef THIS_FILE ;\Y& ce  
static char THIS_FILE[] = __FILE__; T}P".kpbS  
#endif !Kj,9NX{U  
#define IDM_SHELL WM_USER+1 @I/]D6 ~"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "zRoU$X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y_IM@)1H~  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; jvFTR'R)=  
class CAboutDlg : public CDialog _D_LgH;}  
{ :1^R9yWA4  
 public: A"D,Kg S  
  CAboutDlg(); "WK{ >T  
  // Dialog Data o=?C&f{  
  //{{AFX_DATA(CAboutDlg) 5HO9 +i  
  enum { IDD = IDD_ABOUTBOX }; h!ZV8yMc  
  //}}AFX_DATA >W`4aA  
  // ClassWizard generated virtual function overrides oifv+oY  
  //{{AFX_VIRTUAL(CAboutDlg) B'EKM)dA  
 protected: @reeO=  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support C@W"yYt  
  //}}AFX_VIRTUAL ,o,I5>`  
  // Implementation ICkp$u^  
 protected: 0B@Jity#!  
  //{{AFX_MSG(CAboutDlg) Qj6/[mUr~  
  //}}AFX_MSG R>"OXFaE  
  DECLARE_MESSAGE_MAP() )5U[o0td  
}; Kt|1&Gk  
/_Z652@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4NG?_D5&  
{ WRDjh7~Efn  
 //{{AFX_DATA_INIT(CAboutDlg) #x3ujJ  
 //}}AFX_DATA_INIT FE! lok  
} 69NQ]{1  
yz*6W zD  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) UHxE)]J  
{ MR<;i2p  
 CDialog::DoDataExchange(pDX); C[Dav&=^F  
 //{{AFX_DATA_MAP(CAboutDlg) aj,T)oDbt6  
 //}}AFX_DATA_MAP I=9!Rs(QF  
} F^LZeF[#t  
FMkzrs  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) c#]q^L\x  
 //{{AFX_MSG_MAP(CAboutDlg) <_Q:'cx'  
 // No message handlers z0*_^MH  
 //}}AFX_MSG_MAP }HYjA4o\A  
END_MESSAGE_MAP() jR#~I@q^  
_({A\}Q|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) mJ`A_0  
: CDialog(CCaptureDlg::IDD, pParent) {aJJ `t  
{ >Ll$p 0W  
 //{{AFX_DATA_INIT(CCaptureDlg) @wC5 g 4E  
  m_bControl = FALSE; `8>Py~  
  m_bAlt = FALSE; 9*=W-v  
  m_bShift = FALSE; e|D ;OM  
  m_Path = _T("c:\\"); mL`5u f  
  m_Number = _T("0 picture captured."); Eb>78k(3I)  
  nCount=0; (S`2[.j  
  bRegistered=FALSE; mzc 4/<th  
  bTray=FALSE; fpN- o  
 //}}AFX_DATA_INIT Ttc[Q]Ri  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vp crPVA^  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); A7`1-#  
} S^<g_ q  
L%c0Z@[~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) b2=0}~LK  
{ *"r~-&IL  
 CDialog::DoDataExchange(pDX); o9S+6@  
 //{{AFX_DATA_MAP(CCaptureDlg) 01. &> Duw  
  DDX_Control(pDX, IDC_KEY, m_Key); a~!G%})'a  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -yg?V2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); VA%Un,5h  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); CZt \JW+"  
  DDX_Text(pDX, IDC_PATH, m_Path); 2'<[7!  
  DDX_Text(pDX, IDC_NUMBER, m_Number); dVo.Czyd  
 //}}AFX_DATA_MAP [ $T(WGF  
} 4T<Lgb  
/q$,'^.A  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (?! ,p^  
//{{AFX_MSG_MAP(CCaptureDlg) "a/ Q%.P  
 ON_WM_SYSCOMMAND() u@%r  
 ON_WM_PAINT() BEgV^\u  
 ON_WM_QUERYDRAGICON() Tl|:9_:t  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) gxMfu?zk"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) w L^%w9q-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) l-$uHHyu*  
//}}AFX_MSG_MAP hyT1xa  
END_MESSAGE_MAP() Yl$SW;@  
g@Qgxsyk>  
BOOL CCaptureDlg::OnInitDialog() 0W()lQ   
{ ? j 9|5*  
 CDialog::OnInitDialog(); ~w;]c_{.b  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d4 (/m_HMu  
 ASSERT(IDM_ABOUTBOX < 0xF000); 1#4PG'H  
 CMenu* pSysMenu = GetSystemMenu(FALSE); cl*PFQp9j  
 if (pSysMenu != NULL) @M8|(N%  
 { 2JS`Wqy  
  CString strAboutMenu; UD y(v]  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2{.QjYw^  
  if (!strAboutMenu.IsEmpty()) 79yd&5#e?  
  { ^@_m "^C  
   pSysMenu->AppendMenu(MF_SEPARATOR); +/;*|  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); zn @N'R/  
  } (x$9~;<S*d  
 } 'iY*6<xS<  
 SetIcon(m_hIcon, TRUE); // Set big icon 34R!x6W0  
 SetIcon(m_hIcon, FALSE); // Set small icon zPKr/  
 m_Key.SetCurSel(0); e~T@~(fft  
 RegisterHotkey(); ;u(Du-Os!  
 CMenu* pMenu=GetSystemMenu(FALSE); OLj\-w^  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); UYtuED  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); aRJ>6Q}  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?P7]u>H  
 return TRUE; // return TRUE unless you set the focus to a control <(e8sNe  
} |J~eLh[d  
CCGV~e+  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ACK1@eF  
{ }V|{lvt.  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) sW^a`VM  
 { =_8Tp~j  
  CAboutDlg dlgAbout; ^U8r0]9  
  dlgAbout.DoModal(); ^:jN3@ Q%  
 } yRYWch  
 else R, 8s_jN  
 { x)_@9ldYv  
  CDialog::OnSysCommand(nID, lParam); m%8q Zzqk  
 } DBs*F x[  
} 1]T`n/d V  
.~gl19#:T  
void CCaptureDlg::OnPaint() nB ".'=  
{ Jj^GWZRu  
 if (IsIconic()) Z_1*YRBY;  
 { (:+>#V)pZ  
  CPaintDC dc(this); // device context for painting T^}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X+n`qiwq  
  // Center icon in client rectangle *}):<nB$^  
  int cxIcon = GetSystemMetrics(SM_CXICON); TjBY 4  
  int cyIcon = GetSystemMetrics(SM_CYICON); <[/%{sUNC  
  CRect rect; ozr9>b>M  
  GetClientRect(&rect); 2`= 6%s  
  int x = (rect.Width() - cxIcon + 1) / 2; :;!\vfZbU  
  int y = (rect.Height() - cyIcon + 1) / 2; 'iLH `WE  
  // Draw the icon {hO`6mr&t  
  dc.DrawIcon(x, y, m_hIcon); H2-28XGc  
 } @l UlY2  
 else 3v!~cC~cI  
 { VRW] a  
  CDialog::OnPaint(); AP\ofLmq  
 } v1.q$ f^(  
} Us~ X9n_F  
!z zW2>  
HCURSOR CCaptureDlg::OnQueryDragIcon() qYp$fmj  
{ Y#01o&f0n  
 return (HCURSOR) m_hIcon; 8)\M:s~7&  
} qOG}[%<^n7  
[W,-1.$!dM  
void CCaptureDlg::OnCancel() n|4;Hn1V  
{ hD<f3_k  
 if(bTray) :<~7y.*O{  
  DeleteIcon(); ~mN% (w!^  
  CDialog::OnCancel(); )J3kxmlzQ  
} ".~{:=  
uC]Z8&+obb  
void CCaptureDlg::OnAbout() !)Rr] ~  
{ [Id}4[={e  
 CAboutDlg dlg; Jll-X\O`-  
 dlg.DoModal(); v&MU=Tcqi  
} r5/R5Ga^  
u>Ki$xP1  
void CCaptureDlg::OnBrowse() ZZ)G5ji  
{  9|S`ub'  
 CString str; a1MFjmq  
 BROWSEINFO bi; ;' e@t8i6  
 char name[MAX_PATH]; czBi Dk4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); xUYow  
 bi.hwndOwner=GetSafeHwnd(); oaDsk<(j;R  
 bi.pszDisplayName=name; [D'Gr*5~{  
 bi.lpszTitle="Select folder"; /CT(k1>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *[kxF*^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); [B?z1z8l  
 if(idl==NULL) f e $Wu  
  return; <5Mrp"C[i  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Eb.;^=x  
 str.ReleaseBuffer(); V_L[P9  
 m_Path=str; o+g4p:Mf  
 if(str.GetAt(str.GetLength()-1)!='\\') X$wehMBX  
  m_Path+="\\"; '0+$ m=   
 UpdateData(FALSE); \-. Tg!Q6  
} J^I7BsZ  
-rDz~M+  
void CCaptureDlg::SaveBmp() |tG+iF@4  
{ T0FZ7  
 CDC dc; Ud3""C5B  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); N5 q725zJ  
 CBitmap bm; ZcZ;$*  
 int Width=GetSystemMetrics(SM_CXSCREEN); j.QHkI1.  
 int Height=GetSystemMetrics(SM_CYSCREEN); 4S *,\q]q  
 bm.CreateCompatibleBitmap(&dc,Width,Height); WaYO1*=  
 CDC tdc; FWTx&Ip  
 tdc.CreateCompatibleDC(&dc); MtG_9-  
 CBitmap*pOld=tdc.SelectObject(&bm); +(ny|r[#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); p~bkf>  
 tdc.SelectObject(pOld); 3B,QJ&  
 BITMAP btm; o?!uX|Fy  
 bm.GetBitmap(&btm); 0MpS4tW0=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ~+m,im8}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s[-]cHQ  
 BITMAPINFOHEADER bih; ]A!.9Ko}u  
 bih.biBitCount=btm.bmBitsPixel; hmGdjw t$  
 bih.biClrImportant=0; y-cw~kNPP3  
 bih.biClrUsed=0; /{G/|a  
 bih.biCompression=0; ,z66bnjO  
 bih.biHeight=btm.bmHeight; (G5xkygR9  
 bih.biPlanes=1; OKQLv+q5K)  
 bih.biSize=sizeof(BITMAPINFOHEADER); KF{a$d  
 bih.biSizeImage=size; La}o(7 =s  
 bih.biWidth=btm.bmWidth; POBpJg  
 bih.biXPelsPerMeter=0; _ +KmNfR  
 bih.biYPelsPerMeter=0; glor+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >RR<eYu7m  
 static int filecount=0; /`R dQ<($  
 CString name; l @A"U)A(  
 name.Format("pict%04d.bmp",filecount++); j<$R4A 1  
 name=m_Path+name; f8!l7{2%q  
 BITMAPFILEHEADER bfh; sfC@*Y2XT  
 bfh.bfReserved1=bfh.bfReserved2=0; ;Prg'R[o;  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &HxT41pku  
 bfh.bfSize=54+size; v>^jy8$  
 bfh.bfOffBits=54; 6{^*JC5nj  
 CFile bf; cMtJy"kK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Mw|SH;nM  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #KJZR{  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ' PL_~  
  bf.WriteHuge(lpData,size); M,L@k  
  bf.Close(); 3*\8p6G  
  nCount++; i;HH ! TaN  
 } V~c(]K)-  
 GlobalFreePtr(lpData); 0|Q.U  
 if(nCount==1) mCrU//G  
  m_Number.Format("%d picture captured.",nCount); {Pvr??"r  
 else Isp_U5M  
  m_Number.Format("%d pictures captured.",nCount); #wD7 \X-f  
  UpdateData(FALSE); di<B~:l58  
} v|To+ P6b  
 . X0t"  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) D JJZJ}7  
{ feg`(R2  
 if(pMsg -> message == WM_KEYDOWN) dp< au A  
 { | /#'S&!U  
  if(pMsg -> wParam == VK_ESCAPE) ;q&Z9 lm  
   return TRUE; [EOMCH2Ki  
  if(pMsg -> wParam == VK_RETURN) w}b<D#0XC  
   return TRUE; eu=|t&FKk  
 } q"p#H8  
 return CDialog::PreTranslateMessage(pMsg); !pV<n  
} 1G_xP^H!  
a}GAB@YI  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C[W5d~@;E  
{ YRu%j4Tx  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ^~*8 @v""  
  SaveBmp(); 5EfY9}dl  
  return FALSE; Wb'*lT0=  
} 1YFAr}M  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ x/[8Wi,yB  
 CMenu pop; K5+!(5V~  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); %)dI2 J^Xf  
 CMenu*pMenu=pop.GetSubMenu(0); AYYRxhv_,  
 pMenu->SetDefaultItem(ID_EXITICON); .^GFy   
 CPoint pt; <M`-`v6H  
 GetCursorPos(&pt); "j +v,js  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Q+/R JM?3@  
 if(id==ID_EXITICON) =G[ H,;W  
  DeleteIcon(); ],$6&Cm  
 else if(id==ID_EXIT) =QTmK/(|B  
  OnCancel(); v6KL93  
 return FALSE; C,R,:zR  
} &(WE]ziuO  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $TFTIk*uU  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) lWIv(%/@  
 AddIcon(); @#1cx  
 return res; tc5M$b3^2  
} AtuZF  
wbl ${@4  
void CCaptureDlg::AddIcon() 8\P JSr  
{ i:R!T,  
 NOTIFYICONDATA data; "{mt?  
 data.cbSize=sizeof(NOTIFYICONDATA); )ZviS.  
 CString tip; UVnrDhd!0  
 tip.LoadString(IDS_ICONTIP); }3Df]  
 data.hIcon=GetIcon(0); jf2y0W>6s  
 data.hWnd=GetSafeHwnd(); 8R BDJ  
 strcpy(data.szTip,tip); enWF7`  
 data.uCallbackMessage=IDM_SHELL; yi&?d&rK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !OV|I  
 data.uID=98; 57'q;I  
 Shell_NotifyIcon(NIM_ADD,&data); :Q8g?TZ  
 ShowWindow(SW_HIDE); Ml8E50t>;  
 bTray=TRUE; y}Ck zD  
} i:\bqK  
6_pDe  
void CCaptureDlg::DeleteIcon() +|)zwe  
{ f*UBigk  
 NOTIFYICONDATA data; S_`W@cp[  
 data.cbSize=sizeof(NOTIFYICONDATA); 'o7R/`4KR  
 data.hWnd=GetSafeHwnd(); `9]P/J^  
 data.uID=98; 'et(:}i  
 Shell_NotifyIcon(NIM_DELETE,&data); q`h7H][(A  
 ShowWindow(SW_SHOW); ry z /rf  
 SetForegroundWindow(); ]cS&8{ ^2  
 ShowWindow(SW_SHOWNORMAL); IQ o]9Lx  
 bTray=FALSE; s_x=^S3~LO  
} 1w(<0Be  
=lYvj  
void CCaptureDlg::OnChange() UU*0dSWr  
{ tbL1g{Dz,  
 RegisterHotkey(); ks)fQFSbu  
} aA7S'[NjB  
Yjpb+}  
BOOL CCaptureDlg::RegisterHotkey() ;|2U f   
{ S6= \r{V  
 UpdateData(); 27}.s0{D  
 UCHAR mask=0; Vj#%B.#Zbf  
 UCHAR key=0; &8R-C[A  
 if(m_bControl) (*LTq C  
  mask|=4; oBhL}r  
 if(m_bAlt) 6(!,H<bON  
  mask|=2; GZ; Z  
 if(m_bShift) <m-Ni  
  mask|=1; hB?U5J  
  key=Key_Table[m_Key.GetCurSel()]; wn&[1gBxM  
 if(bRegistered){ oiIt3<BX  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); PEMxoe<+  
  bRegistered=FALSE; |p'_k(z}  
 } lqhHbB  
 cMask=mask;  /<(R  
 cKey=key; k9. u[y.  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6nM rO$i0k  
 return bRegistered; _SU,f>  
} lr)G:I#|  
$IZ *|>(  
  四、小结 s0x@ u  
kfH9Y%bOy  
  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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