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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: P7zUf  
  Dq<DW2It>  
  一、实现方法 hu} vYA7ZH  
:j .:t  
  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: tY]?2u%)  
kaQNcMcq  
#pragma data_seg("shareddata") 2L;=wP2?{  
HHOOK hHook =NULL; //钩子句柄 n{<}<SVY  
UINT nHookCount =0; //挂接的程序数目 5,oLl {S'  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 B|"/bQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 [e ztu9  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey *P9"1K +  
static int KeyCount =0; ,wM}h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |a"]@W$>  
#pragma data_seg() mjg@c|rTG  
]UEA"^  
  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。 %qo.n v  
J^CAQfcx  
  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: eR>8V8@  
b/qK/O8J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR vdvnwzp!l  
cKey,UCHAR cMask) Kr'?h'F  
{ %Vltc4QU  
 BOOL bAdded=FALSE; Yq51+\d  
 for(int index=0;index<MAX_KEY;index++){ IO9|o!&>  
  if(hCallWnd[index]==0){ :L+ xEL  
   hCallWnd[index]=hWnd; Rc{R^5B  
   HotKey[index]=cKey; GTTEg{  
   HotKeyMask[index]=cMask; l,]%D  
   bAdded=TRUE; ?Y -;781  
   KeyCount++; T30fp  
   break; s@"|o3BX  
  } =bja\r{  
 } svDnw cl  
 return bAdded; %L]sQq,  
} |>xuH#Q  
//删除热键 ~+0IFJ`}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #_S]\=N(  
{ 2[3t7C  
 BOOL bRemoved=FALSE; 9O-~Ws ;  
 for(int index=0;index<MAX_KEY;index++){ 'R'hRMD9o  
  if(hCallWnd[index]==hWnd){ d7G@Z|R3p  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0fBwy/:  
    hCallWnd[index]=NULL; SPdEO3  
    HotKey[index]=0; hp/pm6  
    HotKeyMask[index]=0; ogQfzk  
    bRemoved=TRUE; Z}0xK6  
    KeyCount--; gsEcvkj*  
    break; ]i6* $qgma  
   } \+sa[jK  
  } ;A@DE@^5w  
 } (M1YOK)I  
 return bRemoved; M_UmnqN1C  
} bri8o"  
+aEm]=3  
&}Wi@;G]2  
  DLL中的钩子函数如下: 9M7P|Q  
#yR&|*@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 0\Jeyb2dl  
{ "|dhmV[;  
 BOOL bProcessed=FALSE; 7<)  
 if(HC_ACTION==nCode) BQ u8$W  
 { '{.4~:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 4.wrY6+V  
   switch(wParam) X)iI]   
   {  #"!ga)a%L  
    case VK_MENU: x+za6e_k"  
     MaskBits&=~ALTBIT; -hm/lxyU  
     break; :w5g!G?z  
    case VK_CONTROL: oVZzvK(zR  
     MaskBits&=~CTRLBIT; K n1;=k  
     break; L)\<7  
    case VK_SHIFT: 'Z.C&6_  
     MaskBits&=~SHIFTBIT; F5YoEWS  
     break; ?yj g\S?L  
    default: //judge the key and send message !LpjTMYs  
     break; H.>EO&#|p  
   } vxk0@k_  
   for(int index=0;index<MAX_KEY;index++){ U _A'/p^D  
    if(hCallWnd[index]==NULL) r^msJ|k8[  
     continue; >0ZG&W9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0U*f"5F  
    { w0j'>4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ag+B*   
     bProcessed=TRUE; UcB&p t&  
    } "\}h  
   } EZ"i0u  
  } .),9q z`  
  else if((lParam&0xc000ffff)==1){ //有键按下 #prYZcHv:_  
   switch(wParam) |XG&[TI- "  
   { -V~Fj~b#  
    case VK_MENU: pL[3,.@WA  
     MaskBits|=ALTBIT; ,:J[|9  
     break; #&r}J  
    case VK_CONTROL: CP2wg .  
     MaskBits|=CTRLBIT; @XtrC|dkkE  
     break; _ {#K  
    case VK_SHIFT: M6Xzyt|  
     MaskBits|=SHIFTBIT; @73kry v  
     break; `kvIw,c.  
    default: //judge the key and send message {Y2 J:x  
     break; YRBJ(v"9  
   } -R]~kGa6m<  
   for(int index=0;index<MAX_KEY;index++){ PIo@B|W-SX  
    if(hCallWnd[index]==NULL) =8*ru\L:hr  
     continue; 1twpOZ>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) k= 9+"4:  
    { t,/8U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); DMDtry?1:  
     bProcessed=TRUE; ^J hs/HV  
    } \*{MgwF  
   } Ths~8{dMb  
  } BGj!/E  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 F Xr\  
   for(int index=0;index<MAX_KEY;index++){ H}G 9gi  
    if(hCallWnd[index]==NULL) (=WYi~2v  
     continue; F|m &n&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YCb|eS^u  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =Gzs+6A8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 S~fP$L5  
   } McS]aJfrk  
  } ZD|F"v.  
 } H$WD7/?j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0n2H7}Uq  
}  *$DD+]2  
hPz=Ec<zW  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: xgkCN$zQ`  
V{q*hQd_3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); DOFW"SpE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p&<n_b  
CC3 i@  
  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: WW6-oQs_#*  
FMF  mn|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C|IHRw`[  
{ "bRjY?D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?#&[1.= u  
 { (vD==n9Hd  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \P":V  
  SaveBmp(); `\"<%CCe  
  return FALSE; 3[_WTwX0  
 } PbS1`8|4  
 …… //其它处理及默认处理 *3={s"a.(  
} ?Q"<AL>Z  
(X5y%~;V5a  
{2Tu_2>  
  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。 X|!@%wuGC  
_s0)Dl6K  
  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。 ( [a$Z2m  
Aep](je  
  二、编程步骤 OMo/a%`  
|k]]dP|:'  
  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"; ) ] Ro  
h~qvd--p0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; (7! pc  
HfH_jnR*  
  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; 9SA%'  
%rrD+  
  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; OIw[sum2  
bw/mF5AsW  
  5、 添加代码,编译运行程序。 qHyOaK Md  
a[j]fv*6  
三、程序代码 gn.)_  
6+ptL-Zt<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL c'VCCXe  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) $>_`.*I/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9mXmghoCO  
#if _MSC_VER > 1000 vyWx{ @  
#pragma once jz;{,F  
#endif // _MSC_VER > 1000 FwB xag:u  
#ifndef __AFXWIN_H__ t(PA+~sIp  
#error include 'stdafx.h' before including this file for PCH }#E]efjs  
#endif nwfu@h0G  
#include "resource.h" // main symbols 0(u}z  
class CHookApp : public CWinApp d { P$}b  
{ V(LfFO{^>?  
 public: ZR|s]'  
  CHookApp(); :?z @T[-  
  // Overrides W]bytsl  
  // ClassWizard generated virtual function overrides AEWrrE  
  //{{AFX_VIRTUAL(CHookApp) ~~"U[G1  
 public: 9+<A7PM1T  
  virtual BOOL InitInstance(); ABp8PD  
  virtual int ExitInstance(); M e:l)8+  
  //}}AFX_VIRTUAL !h}Vz  
  //{{AFX_MSG(CHookApp) aA>!p{/x  
  // NOTE - the ClassWizard will add and remove member functions here. y,jpd#Y  
  // DO NOT EDIT what you see in these blocks of generated code ! D8E^[w!  
  //}}AFX_MSG I(&N2L$-  
  DECLARE_MESSAGE_MAP() * &#M`,#  
}; ume70ap}m  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); T\4>4eX-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); doX`NbA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v5?)J91  
BOOL InitHotkey(); n[i:$! ,  
BOOL UnInit(); ,d.5K*?aI  
#endif `{yI| Wf  
{`)o xzR  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. L:@COy  
#include "stdafx.h" f0%'4t  
#include "hook.h" YaQ5Z-c  
#include <windowsx.h> d0%Wz5Np  
#ifdef _DEBUG 4~oRcO8!Y  
#define new DEBUG_NEW =1!.g"0  
#undef THIS_FILE 9Ou}8a?m"  
static char THIS_FILE[] = __FILE__; fU%Mz\t  
#endif N;}X$b5Y @  
#define MAX_KEY 100 &io+*  
#define CTRLBIT 0x04  '@.Lg0`  
#define ALTBIT 0x02 j3+ hsA/(k  
#define SHIFTBIT 0x01 N 5{w  
#pragma data_seg("shareddata") \>.[QQVI"l  
HHOOK hHook =NULL; V5 9Vf[i|  
UINT nHookCount =0; )`W|J%w+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey MX!N?k#KhP  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;<0~^,Xm  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #\xy,C'Y  
static int KeyCount =0; 4v5qK  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift SjA'<ZX>TM  
#pragma data_seg() QiVKaBS8  
HINSTANCE hins; u~'_Uqp  
void VerifyWindow(); ,}>b\(Lk  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) \>j@! W  
//{{AFX_MSG_MAP(CHookApp) %7\l+g,  
// NOTE - the ClassWizard will add and remove mapping macros here. CSWA/#&8>  
// DO NOT EDIT what you see in these blocks of generated code! &i`(y>\  
//}}AFX_MSG_MAP # M3d=  
END_MESSAGE_MAP() # X{lV]Z  
E2.!|u2  
CHookApp::CHookApp() $kR%G{j 4  
{ CL(D&8v8~  
 // TODO: add construction code here, ||7x51-yj  
 // Place all significant initialization in InitInstance ,%V%g!6{  
} Y|/,*,u+  
r`+G9sj3U  
CHookApp theApp; 7g oRj  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pA@R,O>zr  
{ rT4qx2u  
 BOOL bProcessed=FALSE; g*4^HbVxt  
 if(HC_ACTION==nCode) *9F{+)A  
 { awQB0ow'$P  
  if((lParam&0xc0000000)==0xc0000000){// Key up CA$|3m9)NM  
   switch(wParam) X6r<#n|l  
   { w#L`|cYCm  
    case VK_MENU: L1@<7?@X  
     MaskBits&=~ALTBIT; wI F'|"  
     break; n7n-uc  
    case VK_CONTROL: n{m[ j+UG  
     MaskBits&=~CTRLBIT; =6fJUy^M\  
     break; ,K&L/*  
    case VK_SHIFT: bi-z%!Z  
     MaskBits&=~SHIFTBIT; :F"NF  
     break; 'auYmX  
    default: //judge the key and send message zE}ry!{  
     break; ^8?px&B y:  
   } RO'b)J:j9  
   for(int index=0;index<MAX_KEY;index++){ d:z7 U  
    if(hCallWnd[index]==NULL) Ogh,  
     continue; \K Kt& bKL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) bNvc@oo  
    { v//Drj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `'bu8JK  
     bProcessed=TRUE; 1u }2}c|  
    } {HVsRpNEf  
   } |F ~U  
  } "p>kiNu  
  else if((lParam&0xc000ffff)==1){ //Key down $ 93j;  
   switch(wParam) b'`C<Rk  
   { 4C;"4''L  
    case VK_MENU: rZ RTQ  
     MaskBits|=ALTBIT; 7 3ABop  
     break; `w "ooK  
    case VK_CONTROL: {~Q}{ha  
     MaskBits|=CTRLBIT; 2 jxh7\zE  
     break; jnFN{(VH  
    case VK_SHIFT: PvxU.  
     MaskBits|=SHIFTBIT; mMK 93Ng"&  
     break; VZk;{  
    default: //judge the key and send message pWoeF=+y]W  
     break; JY D\VaW  
   }  SmAF+d  
   for(int index=0;index<MAX_KEY;index++) _2}/rwVg  
   { _znn`_N:v  
    if(hCallWnd[index]==NULL) ,LU|WXRB  
     continue; 6D*x5L-1o  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) WBD"d<>'  
    {  (S&D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); '|yBz1uL  
     bProcessed=TRUE; G98fBw  
    } IfCa6g<&(  
   } 0A75)T=lQ  
  }  I$fm"N  
  if(!bProcessed){ =u5( zaBe  
   for(int index=0;index<MAX_KEY;index++){ 5J6~]J  
    if(hCallWnd[index]==NULL) '@5"p.  
     continue;  S^5Qhv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) M(Yt9}Z%Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); vH"^a/95|  
   } x^YsXzu  
  } M&rbXi.  
 } lBG"COu  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CG!9{&F  
} @@6c{r^P  
gI+dyoh  
BOOL InitHotkey() !qs3fe<uh"  
{ 1#vi]CX  
 if(hHook!=NULL){ Xh*Nu HH  
  nHookCount++; [XNDYaF8  
  return TRUE; Uee$5a>(  
 } i%r+/D)KvG  
 else Z4T{CwD`D  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); t8~isuiK  
  if(hHook!=NULL) 2t#[$2mg\0  
   nHookCount++; 6lQP+! EF  
  return (hHook!=NULL); .DhB4v&  
} 6eK7Jv\K  
BOOL UnInit() R)]+>M-.  
{ e1R<+`]  
 if(nHookCount>1){ 7<93n`byM  
  nHookCount--; o-<.8Z}>at  
  return TRUE; :CXm@yF~4=  
 } G=KXA'R)1.  
 BOOL unhooked = UnhookWindowsHookEx(hHook); TJ0;xn6o  
 if(unhooked==TRUE){ >ZnnGX6$(  
  nHookCount=0; N >];xb>  
  hHook=NULL; >\s+A2P  
 } ~HUO$*U4<  
 return unhooked; FBA th !E  
} nX+c HF  
3?wL)6Uj8J  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zm=|#f  
{ Y\9zjewc  
 BOOL bAdded=FALSE; ?Pt*4NaT;  
 for(int index=0;index<MAX_KEY;index++){ (ZD~Q_O-  
  if(hCallWnd[index]==0){ %/%TR@/  
   hCallWnd[index]=hWnd; `_pVwa<@w  
   HotKey[index]=cKey; ]/?$DNjCc  
   HotKeyMask[index]=cMask; xL!@$;J  
   bAdded=TRUE; 7$JE+gL/7  
   KeyCount++; 4{ED~w|  
   break; mFuHZ)iQG  
  } i[ n3ILn  
 } }^*m0`H  
 return bAdded; xyi4U(;  
} -N1X=4/fg  
{6>:= ?7]R  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Pt7yYl&n7^  
{ v}uzUY  
 BOOL bRemoved=FALSE; cnU()pd  
 for(int index=0;index<MAX_KEY;index++){ XWUi_{zn  
  if(hCallWnd[index]==hWnd){ &v/R-pz  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A7GWU{i  
    hCallWnd[index]=NULL; E*#5OT  
    HotKey[index]=0; pT<I!,~  
    HotKeyMask[index]=0; -) !;45  
    bRemoved=TRUE; 3\a VZx!  
    KeyCount--; eY'RDQa  
    break; 'F^"+Xi  
   } #UqE %g`J  
  } 2;ac&j1  
 } mS &^xWPV  
 return bRemoved; qGECw#  
} 6=jL2cqx  
3q0S}<h al  
void VerifyWindow() X;yThb` iI  
{ SM[VHNr,-  
 for(int i=0;i<MAX_KEY;i++){ lxtt+R  
  if(hCallWnd!=NULL){ n@//d.T  
   if(!IsWindow(hCallWnd)){ O|0,= 5  
    hCallWnd=NULL; c #8@>;  
    HotKey=0; fvZ[eJ  
    HotKeyMask=0; VI8/@A1Gv  
    KeyCount--; e+wINW  
   } fOz.kK[]  
  } p!+bn,?G  
 } W$Z8AZ{E  
} .-.b:gdO(  
CWS]821;  
BOOL CHookApp::InitInstance()  cjf_,x  
{ Kq}-)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); kFQx7m  
 hins=AfxGetInstanceHandle(); E[>A# l53  
 InitHotkey(); cf*SWKs  
 return CWinApp::InitInstance(); hU 5_ dV  
} *\$ko)x?c  
HXQ } B$V  
int CHookApp::ExitInstance() T)Pr%kF  
{ nF=[m; ~  
 VerifyWindow(); 9]^NAlno  
 UnInit(); a- 7RJ.  
 return CWinApp::ExitInstance(); lLNI5C  
} <O~ieJim  
saVX2j6Y  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file O\}w&BE:h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) g ~>nT>6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ P +Sgbtc  
#if _MSC_VER > 1000 w9CX5Fg  
#pragma once xgZ<. r  
#endif // _MSC_VER > 1000 [ lE^0_+  
]1|OQYG  
class CCaptureDlg : public CDialog :VlMszy}B3  
{ E[Ao*  
 // Construction G%SoC  
 public: Ft?Y c 5  
  BOOL bTray; hF9y^Hx4  
  BOOL bRegistered; agnEYdM_  
  BOOL RegisterHotkey(); LBnlaH.  
  UCHAR cKey; hCB _g  
  UCHAR cMask; X@%4N<  
  void DeleteIcon(); zTfl#%  
  void AddIcon(); DfVSG1g  
  UINT nCount; 4\14HcTcK  
  void SaveBmp(); IgKrcpK#}?  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor MN_1^T5  
  // Dialog Data a#+;BH 1  
  //{{AFX_DATA(CCaptureDlg) #[y2nK3zF  
  enum { IDD = IDD_CAPTURE_DIALOG }; |5\: E}1  
  CComboBox m_Key; *):s**BJ$  
  BOOL m_bControl; )C $1))  
  BOOL m_bAlt; MO *7:hI  
  BOOL m_bShift; NX?6 (lO,  
  CString m_Path; kf_*=ER  
  CString m_Number; iy|xF~  
  //}}AFX_DATA =+"-8tz8FV  
  // ClassWizard generated virtual function overrides ro18%' RRI  
  //{{AFX_VIRTUAL(CCaptureDlg) Gc<^ b  
 public: L:Me  
  virtual BOOL PreTranslateMessage(MSG* pMsg); q `L}\}o  
 protected: BJnysQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t[\6/`YH  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9&1$\ZH  
  //}}AFX_VIRTUAL f!JSb?#3  
  // Implementation oX?~  
 protected: gg$:U  
  HICON m_hIcon; *)Pb-c  
  // Generated message map functions VoNk.h"T  
  //{{AFX_MSG(CCaptureDlg) K9S(Xip  
  virtual BOOL OnInitDialog(); XknbcA|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); NP$ D9#   
  afx_msg void OnPaint(); $%5vJiuk  
  afx_msg HCURSOR OnQueryDragIcon(); G:Nwi=vN  
  virtual void OnCancel(); bl4I4RB  
  afx_msg void OnAbout(); $A>]lLo0  
  afx_msg void OnBrowse(); K(_8oB784  
  afx_msg void OnChange(); k(_^Lq f-  
 //}}AFX_MSG }XRRM:B|)(  
 DECLARE_MESSAGE_MAP() B'D~Q  
}; zu``F]B  
#endif +3?.Vb%jY  
@gm!D`YL  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file l/56;f\IA  
#include "stdafx.h" Bx0=D:j  
#include "Capture.h" _>G=xKA#e  
#include "CaptureDlg.h" M>@PRb:Oc  
#include <windowsx.h> +e&Q<q!,q  
#pragma comment(lib,"hook.lib") f&C]}P  
#ifdef _DEBUG aTE;Gy,W  
#define new DEBUG_NEW O,0j+1?  
#undef THIS_FILE ] {=qdgJ  
static char THIS_FILE[] = __FILE__; k~qZ^9QB~  
#endif 57:27d0y  
#define IDM_SHELL WM_USER+1 ?1Uq ud  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *TYOsD**9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1#nY Z%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; l!%V&HJV  
class CAboutDlg : public CDialog Ol*|J  
{ =${ImMwj  
 public: # 0/,teJ k  
  CAboutDlg(); 6R!AIOD>  
  // Dialog Data 'PdUSv|lH  
  //{{AFX_DATA(CAboutDlg) .a}!!\@  
  enum { IDD = IDD_ABOUTBOX }; ^fvx2<  
  //}}AFX_DATA qino:_g  
  // ClassWizard generated virtual function overrides Q$~_'I7~Mz  
  //{{AFX_VIRTUAL(CAboutDlg) ?wMS[Kj  
 protected: )7a 4yTg!~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mlbSs_LT^  
  //}}AFX_VIRTUAL "Fqrk>Q~  
  // Implementation G_ 6!w//  
 protected: &dJ\}O[r  
  //{{AFX_MSG(CAboutDlg) l1]'3]P(  
  //}}AFX_MSG n;~6'f xe  
  DECLARE_MESSAGE_MAP() ~{[,0,lWU  
}; :bz;_DZP  
BzI(  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Klqte*!  
{ wK  Je^7  
 //{{AFX_DATA_INIT(CAboutDlg) zCSLV>.F  
 //}}AFX_DATA_INIT @;>Xy!G  
} gdG#;T'  
>;k~B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX)  q #X[oVq  
{ \"$jj<gc  
 CDialog::DoDataExchange(pDX); .< -~k@ P  
 //{{AFX_DATA_MAP(CAboutDlg) x$6FvgP(  
 //}}AFX_DATA_MAP cDh\$7'b  
} J24H}^~na  
wyv%c/WlS  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) e)]DFP[ n  
 //{{AFX_MSG_MAP(CAboutDlg) /UiB1-*b  
 // No message handlers iI!g1  
 //}}AFX_MSG_MAP YG>6;g)Zm  
END_MESSAGE_MAP() 0<]]q[pr  
-d6PXf5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]0 ;,M  
: CDialog(CCaptureDlg::IDD, pParent) G3de<?K.[V  
{ eLk:">kj  
 //{{AFX_DATA_INIT(CCaptureDlg) }~! D]/B  
  m_bControl = FALSE; D?r% Y  
  m_bAlt = FALSE; $TavvO%#  
  m_bShift = FALSE; 'o-J)+oa  
  m_Path = _T("c:\\"); UUxP4  
  m_Number = _T("0 picture captured."); ,~7+r#q7  
  nCount=0; .KF(_ 92  
  bRegistered=FALSE; ?f=7F %  
  bTray=FALSE; XC\'8hL:  
 //}}AFX_DATA_INIT ~JohcU}d  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ]H=P(Z -  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \-I)dMm[  
} ;e\K8*o  
IYB;X  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }r:8w*4 7  
{ ~D! Y] SK  
 CDialog::DoDataExchange(pDX); 8iN@n8O  
 //{{AFX_DATA_MAP(CCaptureDlg) ,pVq/1  
  DDX_Control(pDX, IDC_KEY, m_Key); +fG~m:E  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); DWu~%U8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "nC=.5/$  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); /{nZ I_v#  
  DDX_Text(pDX, IDC_PATH, m_Path); e[t1V/ah  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2Q[q)u  
 //}}AFX_DATA_MAP z. xRJ  
} 1DM$FG_Z-  
^%Fn|U\u  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 7dXh,sD  
//{{AFX_MSG_MAP(CCaptureDlg) luV_  
 ON_WM_SYSCOMMAND() FSS~E [(DL  
 ON_WM_PAINT() Y~I6ee,\  
 ON_WM_QUERYDRAGICON() =8x-+u5}rK  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) M pLn)  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) .;NoKO7)  
 ON_BN_CLICKED(ID_CHANGE, OnChange)  h]?[}&  
//}}AFX_MSG_MAP ((tWgSZ3  
END_MESSAGE_MAP() X$ 76#x  
)LE#SGJP  
BOOL CCaptureDlg::OnInitDialog() _<l9j;6  
{ @wW)#!Mou  
 CDialog::OnInitDialog(); B-aJn8>/  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); fFd"21 >  
 ASSERT(IDM_ABOUTBOX < 0xF000); a|@1RH>7H  
 CMenu* pSysMenu = GetSystemMenu(FALSE); j% E9@#  
 if (pSysMenu != NULL) QlWkK.<Z3_  
 { ?+y# t?  
  CString strAboutMenu; 'pl){aL`@u  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4t0-L]v4.*  
  if (!strAboutMenu.IsEmpty()) j0IuuJ+  
  { !6{b)P  
   pSysMenu->AppendMenu(MF_SEPARATOR); >s"kL^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); }o9(Q8  
  } [N guQ]B.  
 } <N\#6m  
 SetIcon(m_hIcon, TRUE); // Set big icon u3_AZ2-;  
 SetIcon(m_hIcon, FALSE); // Set small icon \|Ya*8V  
 m_Key.SetCurSel(0); =!PUKa3f<  
 RegisterHotkey(); 5b%zpx0Y  
 CMenu* pMenu=GetSystemMenu(FALSE); v@ OM  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); _c6 zzGtH  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); =s[P =dU  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); R86:1  
 return TRUE; // return TRUE unless you set the focus to a control [LHfH3[gU  
} %~YQl N  
9/LJ tM  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) g;<_GL  
{ J|[`8 *8  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ov8{ny  
 { px.]m-  
  CAboutDlg dlgAbout; aFwfF^\(|,  
  dlgAbout.DoModal(); fO$~jxR.  
 } K iG/XnS  
 else [[d@P%X&  
 { qVmG"et'J  
  CDialog::OnSysCommand(nID, lParam); iC\t@BVS  
 } )ia$pe s  
} d#wK  
8sxH)"S  
void CCaptureDlg::OnPaint() }8&L?B;90  
{ ' C|yUsBC  
 if (IsIconic()) .%N*g[J  
 { ppo\cy;  
  CPaintDC dc(this); // device context for painting jYJfo<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $)Pmr1==  
  // Center icon in client rectangle *`.4M)Ym~  
  int cxIcon = GetSystemMetrics(SM_CXICON); LjA>H>8%[  
  int cyIcon = GetSystemMetrics(SM_CYICON); k84JDPu#  
  CRect rect; -YP>mwSN?  
  GetClientRect(&rect); 9{V54ue;  
  int x = (rect.Width() - cxIcon + 1) / 2; JIyIQg'5i  
  int y = (rect.Height() - cyIcon + 1) / 2; LuIs4&[EW  
  // Draw the icon FR@## i$  
  dc.DrawIcon(x, y, m_hIcon); B~2\v%J  
 } _Vxk4KjP5  
 else ij~023$DTt  
 { 6sp?'GO`~  
  CDialog::OnPaint(); _"#ucM=B:-  
 } B#;yko  
} _fQBXG2  
H&zhYKw  
HCURSOR CCaptureDlg::OnQueryDragIcon() S vR? nN|  
{ 4`+hX'  
 return (HCURSOR) m_hIcon; Oy/+uw^  
} j(maj  
u6(>?r-  
void CCaptureDlg::OnCancel() &MsBcP[  
{ SZQ4e  
 if(bTray) )51H\o  
  DeleteIcon(); 8y, ]>n  
  CDialog::OnCancel(); ^04|tda  
} RW. >;|m  
/K]<7  
void CCaptureDlg::OnAbout() oZ(T`5  
{ {|J'd+  
 CAboutDlg dlg; 'F@#.Op`  
 dlg.DoModal(); +e%U6&l{  
} lfp'D+#p {  
h&6v&%S/L  
void CCaptureDlg::OnBrowse() *m[ow s  
{ <C9_5C e~  
 CString str; 8L7ZWw d  
 BROWSEINFO bi; #7A_p8  
 char name[MAX_PATH]; tgbr/eCoU  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); P$=Y5   
 bi.hwndOwner=GetSafeHwnd(); V+kU^mI  
 bi.pszDisplayName=name; /n SmGAO  
 bi.lpszTitle="Select folder"; :9`T.V<?  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; $xf{m9 8  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Q0j$u[x6s  
 if(idl==NULL) ^L1#  
  return; C,xM) V^a  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 0UB,EI8   
 str.ReleaseBuffer(); P]G`Y>#$r  
 m_Path=str; z@0*QZ.y 1  
 if(str.GetAt(str.GetLength()-1)!='\\') {~"6/L  
  m_Path+="\\"; +L8 6 w7  
 UpdateData(FALSE); 058+_xX  
} Gq/f|43}@O  
@ 0RB.-  
void CCaptureDlg::SaveBmp() zU9G: jH  
{ Q7 Clr{&  
 CDC dc; C  +%&!Q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zU'\r~c  
 CBitmap bm; &&;ol}W  
 int Width=GetSystemMetrics(SM_CXSCREEN); ]' F{uDm[  
 int Height=GetSystemMetrics(SM_CYSCREEN); 5Go&+|cvJ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); }bVWV0Aeim  
 CDC tdc; +89s+4Jn  
 tdc.CreateCompatibleDC(&dc); N@>,gm@UU  
 CBitmap*pOld=tdc.SelectObject(&bm); 89@e &h*  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); U8z$=W o  
 tdc.SelectObject(pOld); I%NPc4p  
 BITMAP btm; |6pNe T[  
 bm.GetBitmap(&btm); 0pS|t/h0  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ]r{-K63P{!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <z*SO a  
 BITMAPINFOHEADER bih; DVNGV   
 bih.biBitCount=btm.bmBitsPixel; # Pulbk8  
 bih.biClrImportant=0; @]#0jiS  
 bih.biClrUsed=0; vRLkz4z   
 bih.biCompression=0; i~dW)7  
 bih.biHeight=btm.bmHeight; ''Y}Q"  
 bih.biPlanes=1; ?5#Ng,8iT  
 bih.biSize=sizeof(BITMAPINFOHEADER); 64^dy V,;  
 bih.biSizeImage=size; J2`b:%[  
 bih.biWidth=btm.bmWidth; tZ]|3wp  
 bih.biXPelsPerMeter=0; *JX)q  
 bih.biYPelsPerMeter=0; lMX 2O2 o  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 7)IB IlV  
 static int filecount=0; V6,D~7  
 CString name; y#AwuC K  
 name.Format("pict%04d.bmp",filecount++); o?f7_8fG  
 name=m_Path+name; aPq9^S*  
 BITMAPFILEHEADER bfh; ai(<"|(  
 bfh.bfReserved1=bfh.bfReserved2=0; U/2g N H  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ^IxT.g  
 bfh.bfSize=54+size; _,i]ra{%  
 bfh.bfOffBits=54; oVsj Q  
 CFile bf; FKd5]am  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ L)'JkX J  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @xJ qG"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "-4V48ci  
  bf.WriteHuge(lpData,size); PnsQ[}.  
  bf.Close(); oQC*d}_E}  
  nCount++; l[O!_bH  
 } 2roPZj  
 GlobalFreePtr(lpData); x+vNA J  
 if(nCount==1) qwu++9BM  
  m_Number.Format("%d picture captured.",nCount); ^A^,/3  
 else `~hAXnQK=  
  m_Number.Format("%d pictures captured.",nCount); 8x jJ  
  UpdateData(FALSE); jGzs; bE  
} G qI^$5?  
2hV#3i  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {4 !%'~  
{ 22\Buk}?  
 if(pMsg -> message == WM_KEYDOWN) FDaHsiI:  
 { JEX{jf  
  if(pMsg -> wParam == VK_ESCAPE) JbG\Ywi0]  
   return TRUE; 0Ng6Xg(QHc  
  if(pMsg -> wParam == VK_RETURN) Bo?uwi  
   return TRUE; CJ_X:Frj)  
 } ~4[2{M.0>@  
 return CDialog::PreTranslateMessage(pMsg); GV1\8OG7  
} QeA)@x.p  
 K6kPNi  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kx 'ncxN~  
{ &J_|P43  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ z12[vN  
  SaveBmp(); pr\yc  
  return FALSE; kL^;^!Nt  
} )#MKOsOct  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ +15j^ Az  
 CMenu pop; h:(Jes2  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); !arcQ:T@G  
 CMenu*pMenu=pop.GetSubMenu(0); YWeEvo(,=  
 pMenu->SetDefaultItem(ID_EXITICON); +~=>72/r  
 CPoint pt; p 8BAan3  
 GetCursorPos(&pt); FyYQ4ov0&o  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Z~8Xp  
 if(id==ID_EXITICON) _> .TB\  
  DeleteIcon(); N~ljU;wo-9  
 else if(id==ID_EXIT) Qp<?[C}'W  
  OnCancel(); TH/!z,( >  
 return FALSE; &-+qB >SK>  
} sMli!u  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); #$%9XD3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) .9> e r  
 AddIcon(); YL&$cT]1  
 return res; it\{#rb=4  
} a=k+:=%y  
XZuJ<]}X,  
void CCaptureDlg::AddIcon() bK; -Xcm  
{ Z;XR%n8  
 NOTIFYICONDATA data; dY/=-ymW  
 data.cbSize=sizeof(NOTIFYICONDATA); Y>EwU  
 CString tip; q|om^:n.  
 tip.LoadString(IDS_ICONTIP); $Ha?:jSc  
 data.hIcon=GetIcon(0); e%N\Pshgv  
 data.hWnd=GetSafeHwnd(); Z?[;Japg  
 strcpy(data.szTip,tip); H|T:_*5  
 data.uCallbackMessage=IDM_SHELL; 8iD_md_[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; h$~ NPX  
 data.uID=98; %|Gi'-'|b$  
 Shell_NotifyIcon(NIM_ADD,&data); YWM$%   
 ShowWindow(SW_HIDE); GC H= X  
 bTray=TRUE; Mq42^m:qe  
} d6<,R;)  
u.0Z)j}N  
void CCaptureDlg::DeleteIcon() {gl-tRC3  
{ JrseU6N  
 NOTIFYICONDATA data; |]DZc/  
 data.cbSize=sizeof(NOTIFYICONDATA); M9]O!{ sq  
 data.hWnd=GetSafeHwnd(); g GN[AqR  
 data.uID=98; WW@/q`h  
 Shell_NotifyIcon(NIM_DELETE,&data); jfl7L"2  
 ShowWindow(SW_SHOW); b ^ ly  
 SetForegroundWindow(); J @"wJEF  
 ShowWindow(SW_SHOWNORMAL); d7^:z%Eb|  
 bTray=FALSE; W+a>*#*  
}  ~MyP4x/  
W$N_GR'4  
void CCaptureDlg::OnChange() s>~!r.GC  
{ (G} *ho  
 RegisterHotkey(); ag14omM-  
} G?e,Q$  
q+dY&4&u  
BOOL CCaptureDlg::RegisterHotkey() X6!u(plVQ  
{ *FR Eh@R  
 UpdateData(); ;%]Q%7  
 UCHAR mask=0; \ Yz>=rY  
 UCHAR key=0; =]\,I'  
 if(m_bControl) _+wou(1y  
  mask|=4; i5|A\Wv"  
 if(m_bAlt) J^pL_  
  mask|=2; >AV-i$4eQ@  
 if(m_bShift) xv's52x  
  mask|=1; s}`ydwSg8  
  key=Key_Table[m_Key.GetCurSel()]; !zvKl;yT  
 if(bRegistered){ it5].A&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); waQNX7Xdn  
  bRegistered=FALSE; HvK<>9  
 } ;yY>SaQ  
 cMask=mask; 3A4?9>g)KU  
 cKey=key; #; E,>0  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); jIZQ/xp8_  
 return bRegistered; -&M9Yg|Se  
} nmc=RK^cM  
:De}5BMy  
  四、小结 Z5[ t/  
hBz~FB];&  
  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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