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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: XD|&{/O  
  VS}Vl  
  一、实现方法 $~:hv7%  
@x=CMF15  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: rBny*!n  
QY^ y(I49  
#pragma data_seg("shareddata") N@A#e/8  
HHOOK hHook =NULL; //钩子句柄 xE)pj|  
UINT nHookCount =0; //挂接的程序数目 KX9ZwsC0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 k~q[qKb8y:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 +pF z&)?  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #); 6+v  
static int KeyCount =0; ED$gnFa3I  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 RMvlA' c  
#pragma data_seg() |RjjP 7  
d->b9  
  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。 KK] >0QAY  
ar^`r!ABEh  
  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: SjJUhTb  
&c\8` # 6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Yb6\+}th  
cKey,UCHAR cMask) tjTF?>^6|  
{ QWxQD'L'  
 BOOL bAdded=FALSE; o3W5FHFAv  
 for(int index=0;index<MAX_KEY;index++){ ?.Kl/8ml  
  if(hCallWnd[index]==0){ zh4o<f:-  
   hCallWnd[index]=hWnd; lO) B/N&  
   HotKey[index]=cKey; I+<;D sp  
   HotKeyMask[index]=cMask; &G"]v]V  
   bAdded=TRUE; IcIMa  
   KeyCount++; .9ROa#7U;n  
   break; nut7b  
  } ILVbbC`D  
 } <y'ttxeS  
 return bAdded; @+ 2Zt%  
} h T Xc0  
//删除热键 brVT  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :5Vu.\,1  
{ jxoEOEA  
 BOOL bRemoved=FALSE; *1%g=vb  
 for(int index=0;index<MAX_KEY;index++){ qMUqd}=P  
  if(hCallWnd[index]==hWnd){ Jg Xbs+.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ cbteNA!>  
    hCallWnd[index]=NULL; C9nNziws  
    HotKey[index]=0; !*cf}<Kmw  
    HotKeyMask[index]=0; EP8LJzd"  
    bRemoved=TRUE; y%GV9  
    KeyCount--; gTq-\k(  
    break; [Dt\E4  
   } zH_q6@4  
  } l9jcoVo .  
 } K:Ap|F  
 return bRemoved; \.{JS>!  
} Kr#=u~~M  
'v,W gPe  
:#LB}=HQ  
  DLL中的钩子函数如下: K)14v;@  
<AIsNqr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) cK258mY  
{ $wN.~"T  
 BOOL bProcessed=FALSE; 980+Y  
 if(HC_ACTION==nCode) 3LTO+>, |"  
 { jsG9{/Ov3  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 af_zZf!0  
   switch(wParam) f>'7~69  
   {  DTJ  
    case VK_MENU: O3_Mrn(R  
     MaskBits&=~ALTBIT; ZHBwoC#5}  
     break; Z5U~g?  
    case VK_CONTROL: PY2`RZ/@  
     MaskBits&=~CTRLBIT; )CmuC@ Q"  
     break; G]SE A  
    case VK_SHIFT: C VUDN2  
     MaskBits&=~SHIFTBIT; A1@-;/H3  
     break; ;klDt|%3j  
    default: //judge the key and send message 63f/-64?7  
     break; f^]AyU;F:  
   } a} /Vu"  
   for(int index=0;index<MAX_KEY;index++){ \uYUX~}i"  
    if(hCallWnd[index]==NULL) 7q?Yd AUz  
     continue; L=p.@VSZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) r" D|1  
    { 2iGRw4`_a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); w iq{ Jo#  
     bProcessed=TRUE; b^xf ,`D  
    } dnx}c4P  
   } }/LYI  
  } i~,k2*o  
  else if((lParam&0xc000ffff)==1){ //有键按下 Y[H_?f=;%  
   switch(wParam) YO Y+z\Q  
   { G^R;~J*TDE  
    case VK_MENU: Cb13Qz  
     MaskBits|=ALTBIT; NqWHR~&  
     break; i-<=nD&?t  
    case VK_CONTROL: GBQb({  
     MaskBits|=CTRLBIT; j@ "`!uPz  
     break; i`Yf|^;@2>  
    case VK_SHIFT: 9j 8t<5s  
     MaskBits|=SHIFTBIT; D;L :a`Y  
     break; `~RV  
    default: //judge the key and send message 5bw]cv$i  
     break; 79V5{2Y*U  
   } bDkE*4SRX  
   for(int index=0;index<MAX_KEY;index++){ !vB%Q$!x  
    if(hCallWnd[index]==NULL) y"hM6JI  
     continue; W(8g3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gv,T<A?Z2  
    { c,qCZ-.Sg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0 mQ3P.9  
     bProcessed=TRUE; 7L]?)2=  
    } Pjy?&;GvT  
   } DG-vTr  
  } GKSy|z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D 6]$P%t9  
   for(int index=0;index<MAX_KEY;index++){ %8tN$8P  
    if(hCallWnd[index]==NULL) e.+)0)A-  
     continue; 5 QeGx3'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oD7H6\_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^ZlV1G;/W@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 %(Ys-GeGr  
   } vz:0"y  
  } :2My|3H\  
 } )eEvyU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); :6/OU9f/R  
} VqrMi *W6  
Z)A+ wM  
  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: _HK& KY  
]aRD6F:L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a7|&Tbv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "{k )nr+7U  
of`]LU:  
  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: Ak1)  
QT$1D[>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ."X~?Nk  
{ =Q}mJs  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) t4*A+"~j  
 { %MJ7u}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $te,\$&}  
  SaveBmp(); \i+h P1 mz  
  return FALSE; (3h*sd5ly  
 } h yKg=Foq  
 …… //其它处理及默认处理 Zsogx}i-  
} 5Nb_K`Vp*  
ehusI-q  
LwPM7S~ *  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 cv4M[]U~  
zrO|L|F&P  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 UK>=y_FYO  
SU'9+=_$  
  二、编程步骤 4Jr[8P0/A9  
"V0:Lq  
  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"; 7 !.8#A':  
KL  mB  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -C}59G8  
~k0)+D}  
  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; J\+gd%  
b6Hk20+B;  
  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; Iq]6]  
Pu*HZW3l  
  5、 添加代码,编译运行程序。 ls\E%d  
6a7iLQA  
三、程序代码 }.) 43(>]  
?1:/ 6  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL SQU%N  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Z{4aGp*  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ SWsv,  
#if _MSC_VER > 1000 %`'z^W  
#pragma once )xx/di  
#endif // _MSC_VER > 1000 K=?F3tX^  
#ifndef __AFXWIN_H__ ]C6[`WF  
#error include 'stdafx.h' before including this file for PCH $ cK B+}  
#endif }!<cph  
#include "resource.h" // main symbols w a<C*o  
class CHookApp : public CWinApp 5b`xN!c  
{ )v{41sM+  
 public: z~e~K`S  
  CHookApp(); /_OZ1jX  
  // Overrides rY?F6'}  
  // ClassWizard generated virtual function overrides Pd "mb~  
  //{{AFX_VIRTUAL(CHookApp) d"6]?  
 public: -,A5^>}%,Y  
  virtual BOOL InitInstance(); m'(;uR`  
  virtual int ExitInstance(); :2)1vQH0L  
  //}}AFX_VIRTUAL 6a?$=y  
  //{{AFX_MSG(CHookApp) HL}~W}!j  
  // NOTE - the ClassWizard will add and remove member functions here. ~1r*/@M[V  
  // DO NOT EDIT what you see in these blocks of generated code ! [F)/mN  
  //}}AFX_MSG ?U/Wio$@  
  DECLARE_MESSAGE_MAP() XQJ^)d00h  
}; ObyuhAR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); d<Q+D1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +%qSB9_>N{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Qy^z*s  
BOOL InitHotkey(); a!y,!EB+Qu  
BOOL UnInit(); iQzX-a|4]  
#endif ;#yu"6{  
z2Y_L8u2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. BZ;}ROmqk  
#include "stdafx.h" Mev-M2A  
#include "hook.h" )*K<;WI WH  
#include <windowsx.h> b({Nf,(a2  
#ifdef _DEBUG ;IuK2iDt<  
#define new DEBUG_NEW y^QYl ZO  
#undef THIS_FILE dXcPWbrU4  
static char THIS_FILE[] = __FILE__; r d6F"W  
#endif @>Ghfh>~D  
#define MAX_KEY 100 ZE8/ m")  
#define CTRLBIT 0x04 {p e7]P?  
#define ALTBIT 0x02 !jnqA Z  
#define SHIFTBIT 0x01 ('* *nP  
#pragma data_seg("shareddata") :DMHezaU  
HHOOK hHook =NULL; mbX)'. +L  
UINT nHookCount =0; Ku/H=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <duBwkiG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT [|[sYo  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey w38c  
static int KeyCount =0; 9Z0CF~Y5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Oh/b?|imG  
#pragma data_seg() CaYos;Pl  
HINSTANCE hins; c2/R]%`)9  
void VerifyWindow(); zyZok*s  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) &V#zkW  
//{{AFX_MSG_MAP(CHookApp) YQ @dl  
// NOTE - the ClassWizard will add and remove mapping macros here. ,%?; \?b%h  
// DO NOT EDIT what you see in these blocks of generated code! ].-J.  
//}}AFX_MSG_MAP =X`]Ct8 Z  
END_MESSAGE_MAP() DN"S,  
YBtq0c  
CHookApp::CHookApp() f OM^V{)T  
{ 2E3?0DL",  
 // TODO: add construction code here, XSp x''l  
 // Place all significant initialization in InitInstance H-_^TB  
} MvZ+n  
\,l.p_<  
CHookApp theApp; hJ;f1dZ7}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \[[TlB>  
{ 2q- :p8  
 BOOL bProcessed=FALSE; ']IT uP8  
 if(HC_ACTION==nCode) ]g>m?\'n  
 { &e-#|p#v  
  if((lParam&0xc0000000)==0xc0000000){// Key up #hgmUa  
   switch(wParam) '&-5CpDUs  
   { ;]gsJ9FK<  
    case VK_MENU: }fJ:wku  
     MaskBits&=~ALTBIT; >@)*S n9"  
     break; HPtTv}l  
    case VK_CONTROL: @ ],6SKbG6  
     MaskBits&=~CTRLBIT; U] V3DDN  
     break; R3B5-^s  
    case VK_SHIFT: ZDOF  
     MaskBits&=~SHIFTBIT; &G-#*OG  
     break; smfG, TI  
    default: //judge the key and send message ?w]"~   
     break; /nC{)s?S'  
   } 4|> rwQ~t  
   for(int index=0;index<MAX_KEY;index++){ j-lSFTo  
    if(hCallWnd[index]==NULL) R`@8.]cpPy  
     continue; s[G |q5n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,DQGv_  
    { oLrkOn/aY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aF&r/j+}o  
     bProcessed=TRUE; MAE7A"l a  
    } {D_++^  
   } ^&+zA,aL,A  
  } .cg=  
  else if((lParam&0xc000ffff)==1){ //Key down pqyWv;  
   switch(wParam) je&dioZ>  
   { !,cQ'*<W8-  
    case VK_MENU: :3KO6/+  
     MaskBits|=ALTBIT; IajD;V  
     break; rc;7W:  
    case VK_CONTROL: M82.khm~jM  
     MaskBits|=CTRLBIT; E4sn[DO  
     break; LP^p~5Az  
    case VK_SHIFT: T@;! yz}Pf  
     MaskBits|=SHIFTBIT; \%sPNw=e  
     break; Km6Ub?/7o  
    default: //judge the key and send message A",eS6  
     break; 3R5K}ZBi%  
   } 2y3?!^$  
   for(int index=0;index<MAX_KEY;index++) !]$V9F{K  
   { Uc_jQ4e_  
    if(hCallWnd[index]==NULL) K :1g"  
     continue; D:=t*2-Iv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @%6)^]m}r  
    { kQ@gO[hS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); v<L=!-b^  
     bProcessed=TRUE; }1QI"M*  
    } VZ\O9lD  
   } a?5WKO  
  } {eEBrJJeB  
  if(!bProcessed){ 2dHM  
   for(int index=0;index<MAX_KEY;index++){ B4`2.yRis  
    if(hCallWnd[index]==NULL) R=!kbBK>\  
     continue; r?fH &u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) AXz-4,=xX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *:a'GC%/  
   } Z;ZuS[ZA  
  } 'S =sj}X  
 } *8z"^7?^=  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^'m\D;  
} {DU"]c/S  
q_cC7p6t  
BOOL InitHotkey() 3^{8_^I  
{ $z*@2Non  
 if(hHook!=NULL){ ARPKzF`Wq  
  nHookCount++; z)}3**3'y  
  return TRUE; oFWt(r   
 } &|)hCJu  
 else he"L*p*H  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O/mR9[}  
  if(hHook!=NULL) e"]"F{Q  
   nHookCount++; YPu9Q  
  return (hHook!=NULL); 1o8wy_eSs  
} lK0s=4c{  
BOOL UnInit() x Sv-;!y  
{ b3}Q#Y\G  
 if(nHookCount>1){ X4a^m w\"  
  nHookCount--; M)L/d_4ka  
  return TRUE; BWWq4mdb{  
 } )D;*DUtMVm  
 BOOL unhooked = UnhookWindowsHookEx(hHook); )T9;6R$b  
 if(unhooked==TRUE){ bG "H D?A_  
  nHookCount=0; #,G1R7  
  hHook=NULL; 1Q]Rd  
 } u^Vh .g]  
 return unhooked; 5L F/5`  
} n=q=zn;  
hi!`9k  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 98GlhogWt  
{ 3?Lgtkb8  
 BOOL bAdded=FALSE; W;4Lkk$  
 for(int index=0;index<MAX_KEY;index++){ `ruNA>M  
  if(hCallWnd[index]==0){ ^K+:C;Q|  
   hCallWnd[index]=hWnd; /#f^n]v  
   HotKey[index]=cKey; >)Ioo$B  
   HotKeyMask[index]=cMask; o]<jZ_|gB  
   bAdded=TRUE; {(4# )K2g%  
   KeyCount++; $_sYfU9  
   break; k'Gw!p}  
  } BWh }^3?l  
 } uVGa(4u}  
 return bAdded; r4u z} jl{  
} )>\4ULR83  
(ew} gJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8'_ 0g[s  
{ 6gnbkpYi  
 BOOL bRemoved=FALSE; {6h|6.S2  
 for(int index=0;index<MAX_KEY;index++){ UP2}q?4  
  if(hCallWnd[index]==hWnd){ =Q-k'=6\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ b._m8z ~  
    hCallWnd[index]=NULL; ;FU|7L$H  
    HotKey[index]=0; 3+ =I;nj  
    HotKeyMask[index]=0; >"%ob,c:#  
    bRemoved=TRUE; zzJja/mp  
    KeyCount--; #jBN?Z#  
    break; rFey4zzz  
   } !;v.>.lw  
  } C`QzT{6!  
 } =\Iu$2r`  
 return bRemoved; <*<U!J-i  
} EiWd+v,QJQ  
L2fZ{bgy  
void VerifyWindow() *nRNg.i3D  
{ z\TLsx  
 for(int i=0;i<MAX_KEY;i++){ )MSZ2)(  
  if(hCallWnd!=NULL){ =xL)$DTg)  
   if(!IsWindow(hCallWnd)){ ?'eq",c#4N  
    hCallWnd=NULL; n *<v]1  
    HotKey=0; 1oty*c  
    HotKeyMask=0; T  p<s1'"  
    KeyCount--; OX\$nQ\o  
   } ^2S# Uk  
  } XN#&NT{t}  
 } M&KyA  
} ~}'F887f  
E"qFXA>  
BOOL CHookApp::InitInstance() $i#?v  
{ (RE2I  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7O)" `  
 hins=AfxGetInstanceHandle(); 8AL\ST51x"  
 InitHotkey(); FJ54S  
 return CWinApp::InitInstance();  \S4SI  
} fPqr6OYz  
^:KO_{3E  
int CHookApp::ExitInstance() z)-c#F@%  
{ I4=Xb^Ux  
 VerifyWindow(); QA?oJ_}y  
 UnInit(); p=Y>i 'CG  
 return CWinApp::ExitInstance(); *jITOR!uF`  
} L(G92,.  
@MbVWiv  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^zr^ N?a  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) h/)_) r.x  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [sy j#  
#if _MSC_VER > 1000 ^U@~+dw  
#pragma once HC*?DJ,  
#endif // _MSC_VER > 1000 2eb1 lJdS  
)8,|-o=  
class CCaptureDlg : public CDialog .c+9P<VmC}  
{ 5l{Ts04k%  
 // Construction [ MyE2^  
 public: r.yK,  
  BOOL bTray; V '.a)6  
  BOOL bRegistered; w0lT%CPx  
  BOOL RegisterHotkey(); pQa:pX  
  UCHAR cKey; HrM$NRhu  
  UCHAR cMask; {tiKH=&J  
  void DeleteIcon(); >IfV\ w32  
  void AddIcon(); vFv3'b$;G  
  UINT nCount; Bc5+ss  
  void SaveBmp(); 6'vbT~S!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor L]%l51U  
  // Dialog Data F@YKFk+a  
  //{{AFX_DATA(CCaptureDlg) 4hs)b  
  enum { IDD = IDD_CAPTURE_DIALOG }; (?0`d  
  CComboBox m_Key; bHE2,;o  
  BOOL m_bControl; A8r^)QJP{  
  BOOL m_bAlt; A7Po 3n%Q  
  BOOL m_bShift; u<xo/=Z  
  CString m_Path; o\VUD  
  CString m_Number; (s<s@`  
  //}}AFX_DATA >ut" OL9J  
  // ClassWizard generated virtual function overrides ino:N5&;;  
  //{{AFX_VIRTUAL(CCaptureDlg) YJeyIYCs<  
 public:  #xh_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2JGL;U$  
 protected: EgjR^A1W2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support sD;M!K_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3uWkc3  
  //}}AFX_VIRTUAL 4?\:{1X=  
  // Implementation SmwQET<H  
 protected: p4!:]0c  
  HICON m_hIcon; p'_%aVm7  
  // Generated message map functions 64>krmVIe  
  //{{AFX_MSG(CCaptureDlg) Y f@e=:  
  virtual BOOL OnInitDialog(); S$,'Q^~K  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); u\yVR$pQ  
  afx_msg void OnPaint(); Fh$slow4!  
  afx_msg HCURSOR OnQueryDragIcon(); w"Y` ]2  
  virtual void OnCancel(); n2B){~vE  
  afx_msg void OnAbout(); dt@P>rel  
  afx_msg void OnBrowse(); {i0SS  
  afx_msg void OnChange(); ]:M0Kj&h  
 //}}AFX_MSG MK #wut  
 DECLARE_MESSAGE_MAP() \y`+B*\i  
}; 'k0[rDFc#3  
#endif Pz*_)N}j >  
DyJ.BQdk)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file EOj"V'!  
#include "stdafx.h" 'xY@x-o  
#include "Capture.h" bNs4 5hDP  
#include "CaptureDlg.h" q[q?hQ/b  
#include <windowsx.h> B%CTOi  
#pragma comment(lib,"hook.lib") sUJ%x#u}Fk  
#ifdef _DEBUG Hmt^h(*/2  
#define new DEBUG_NEW PXzsj.  
#undef THIS_FILE Hb} X-6N  
static char THIS_FILE[] = __FILE__; JF&$t}  
#endif 9I27TKy  
#define IDM_SHELL WM_USER+1 \MC-4Yz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &Mq~T_S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4fk8*{Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ~c^>54  
class CAboutDlg : public CDialog e}/Lk5q!  
{  xw^R@H  
 public: `*", <  
  CAboutDlg(); x+ncc_2n&D  
  // Dialog Data tz4 ]qOH8  
  //{{AFX_DATA(CAboutDlg) v\16RD  
  enum { IDD = IDD_ABOUTBOX }; @AHm!9?o  
  //}}AFX_DATA IN8>ZV`j)  
  // ClassWizard generated virtual function overrides voP7"Dl[  
  //{{AFX_VIRTUAL(CAboutDlg) x3jb%`o#!  
 protected: *_a@z1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "k*PA\U  
  //}}AFX_VIRTUAL (~CLn;'  
  // Implementation 5pr"d@.  
 protected: ::Ke ^dp  
  //{{AFX_MSG(CAboutDlg) X[`bMa7IB(  
  //}}AFX_MSG F <>!kK/c  
  DECLARE_MESSAGE_MAP() `>0MNmu  
}; ) [0T16  
2 rw%H  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) d \x7Zw>  
{ ]f+ csB  
 //{{AFX_DATA_INIT(CAboutDlg) 8Ac)'2t;U  
 //}}AFX_DATA_INIT FZ!`B]]le,  
} 6"Bic rY  
R\o<7g-|  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) rSXh;\MfB4  
{ u6>?AW1~  
 CDialog::DoDataExchange(pDX); _ZY)M  
 //{{AFX_DATA_MAP(CAboutDlg) hxCvk/7sT  
 //}}AFX_DATA_MAP s! n<}C  
} }*.0N;;C  
'YNT8w/3  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) DXz} YIEC  
 //{{AFX_MSG_MAP(CAboutDlg) ;"(foY"L  
 // No message handlers !x!07`+^u  
 //}}AFX_MSG_MAP Q+4Xs.#  
END_MESSAGE_MAP() G}&Sle]  
:'#TCDlOb  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #fT*]NN  
: CDialog(CCaptureDlg::IDD, pParent) 311LC cRp  
{ ,%\o4Rc'o  
 //{{AFX_DATA_INIT(CCaptureDlg) 0a-:<zm  
  m_bControl = FALSE; oc8:r  
  m_bAlt = FALSE; T&Lb<'f  
  m_bShift = FALSE; vAyFmdJ^  
  m_Path = _T("c:\\"); Yjx|9_|Xn  
  m_Number = _T("0 picture captured."); {?'fyEeg  
  nCount=0; yAoe51h?  
  bRegistered=FALSE; \[Z?&  
  bTray=FALSE; w@N  
 //}}AFX_DATA_INIT m0v:\?S:  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 |V<h=D5W  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); )M)7"PC  
} v\p;SwI   
\ Y"Wu  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX)  -_`>j~  
{ }Ho Qwy|&  
 CDialog::DoDataExchange(pDX); _YF%V;X  
 //{{AFX_DATA_MAP(CCaptureDlg) rETRTp0HT  
  DDX_Control(pDX, IDC_KEY, m_Key); H^YSJ 6  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =i~}84>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); y@\V +  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); c%=IL M4  
  DDX_Text(pDX, IDC_PATH, m_Path); J~#;<e{\"  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ULQMG'P^D  
 //}}AFX_DATA_MAP I1PuHf Qs  
} xQUu|gtL4  
E9~Ghx.   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Nm |!#(L  
//{{AFX_MSG_MAP(CCaptureDlg) 1Tu *79A  
 ON_WM_SYSCOMMAND() V0)fZS@tf  
 ON_WM_PAINT() XLH0 ;+CL{  
 ON_WM_QUERYDRAGICON() D9z|VIw8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 3YVi" k?2  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ]\!?qsT3}  
 ON_BN_CLICKED(ID_CHANGE, OnChange) aG^4BpIP  
//}}AFX_MSG_MAP mauI42  
END_MESSAGE_MAP() vd8{c7g:n  
!Y-98<|b M  
BOOL CCaptureDlg::OnInitDialog() eut-U/3:#  
{ tg{H9tU;  
 CDialog::OnInitDialog(); ,T2G~^0  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); s0PrbL%_`  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]Ux<aiY]a  
 CMenu* pSysMenu = GetSystemMenu(FALSE); b,C aWg  
 if (pSysMenu != NULL) @HOBRRm`  
 { 2$Tj84'X  
  CString strAboutMenu; B>2tZZko  
  strAboutMenu.LoadString(IDS_ABOUTBOX); >uSy  
  if (!strAboutMenu.IsEmpty()) p\bDY  
  { rb|U;)C  
   pSysMenu->AppendMenu(MF_SEPARATOR); mya_4I m  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); l,kUhZ@W  
  } @;'o2   
 } ;aw=MV  
 SetIcon(m_hIcon, TRUE); // Set big icon ,G2TVjz  
 SetIcon(m_hIcon, FALSE); // Set small icon wu)w   
 m_Key.SetCurSel(0); ;cQ6g` bM\  
 RegisterHotkey(); W VI{oso#  
 CMenu* pMenu=GetSystemMenu(FALSE); DCZ\6WY1G)  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); %@u;5qD&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 5F~'gLH/F-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); gXjV?"^kUl  
 return TRUE; // return TRUE unless you set the focus to a control YxP&7oq  
} Y*UA, <-  
uXKERzg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9^j &V mF  
{ l6d$V 9A  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) R=|{n'n$0|  
 { m&?#;J|B$  
  CAboutDlg dlgAbout; 9M:O0)s  
  dlgAbout.DoModal(); 7R`mf   
 } Rp5#clsy  
 else % ClHCoyA  
 { 6Aku1h  
  CDialog::OnSysCommand(nID, lParam); o|$AyS{1  
 } ~/P&Tub^  
} 9<>wIl*T`  
`b^Ru+(dM  
void CCaptureDlg::OnPaint() 'nwx9]q  
{ 9pX&ZjYP-  
 if (IsIconic()) ,]d,-)KX8  
 { 07[_.i.l  
  CPaintDC dc(this); // device context for painting @w?P7P<O`  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H XmS|PX  
  // Center icon in client rectangle =W"F[fD  
  int cxIcon = GetSystemMetrics(SM_CXICON); PBp^|t]E>  
  int cyIcon = GetSystemMetrics(SM_CYICON); L>3x9  
  CRect rect; ROous4MG  
  GetClientRect(&rect); ^3UGV*Ypk  
  int x = (rect.Width() - cxIcon + 1) / 2; sashzVwJ-=  
  int y = (rect.Height() - cyIcon + 1) / 2; aXoVy&x=  
  // Draw the icon 6E^.7%3  
  dc.DrawIcon(x, y, m_hIcon); v+X)Qmzf~  
 } RR]CW  
 else WUh$^5W  
 { $GTU$4u  
  CDialog::OnPaint(); LS917ci-  
 } wf:OK[r9  
} hX=A)73(  
fIsp;ca[k  
HCURSOR CCaptureDlg::OnQueryDragIcon() 4/wa+Y+=vt  
{ 9;B0Mq py  
 return (HCURSOR) m_hIcon; 6Q${U7%7  
} ;oc&Hb  
=_:et 0  
void CCaptureDlg::OnCancel() 6,0_)O}\b  
{ ;<(W% _  
 if(bTray) ;ShJi  
  DeleteIcon(); Mw;sLsu  
  CDialog::OnCancel(); RH&~+5  
} rv|)n>m  
%y@Hh=  
void CCaptureDlg::OnAbout() FgB& b  
{ c1E'$- K@  
 CAboutDlg dlg; 6x%h6<#xh*  
 dlg.DoModal(); D?NbW @]  
} `.i!NBA'6  
<y?r!l=Am  
void CCaptureDlg::OnBrowse() `0Oh_8"  
{ z}MP)|aH:  
 CString str; /K. !sQ$  
 BROWSEINFO bi; U 15H2-`  
 char name[MAX_PATH]; T-U}QM_e  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); lc~%=  
 bi.hwndOwner=GetSafeHwnd(); +Zaj,oEE  
 bi.pszDisplayName=name; &2{ tF  
 bi.lpszTitle="Select folder"; Ndi9FD3im  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; >kW@~WDMu  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); # ?/<  
 if(idl==NULL) v%iof1 T'  
  return; |bO"_U  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d'G0m9u2  
 str.ReleaseBuffer(); a-|*?{o  
 m_Path=str; <gQIq{B?  
 if(str.GetAt(str.GetLength()-1)!='\\') v~@pMA$(h  
  m_Path+="\\"; gk0(ANx  
 UpdateData(FALSE); =5(>q5Z*  
} K*X_FJ  
kNobl  
void CCaptureDlg::SaveBmp() 5Hw~2 ?a,  
{ .O0 +H+  
 CDC dc; ?B}{GL2)  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !BOY@$Y  
 CBitmap bm; PqiB\~o@Z  
 int Width=GetSystemMetrics(SM_CXSCREEN); paD!Z0v&  
 int Height=GetSystemMetrics(SM_CYSCREEN); E: $P=%b  
 bm.CreateCompatibleBitmap(&dc,Width,Height); N<IT w/@^  
 CDC tdc; fvdU`*|n)  
 tdc.CreateCompatibleDC(&dc); {l/-LZ.  
 CBitmap*pOld=tdc.SelectObject(&bm); Nw1#M%/!r!  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); U qFv}VsnF  
 tdc.SelectObject(pOld); aPm`^ q  
 BITMAP btm; UHTvCc  
 bm.GetBitmap(&btm); RM!<8fXYD  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 9*{[buZX  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vJ-q*qM1  
 BITMAPINFOHEADER bih; B#.L  
 bih.biBitCount=btm.bmBitsPixel; 8q,6}mV  
 bih.biClrImportant=0; 4Dw@r{  
 bih.biClrUsed=0; [&#/]Ul'  
 bih.biCompression=0; l%1!a  
 bih.biHeight=btm.bmHeight; 'gTbA?+@5  
 bih.biPlanes=1; -\ EP.Vtz  
 bih.biSize=sizeof(BITMAPINFOHEADER); |~X ;1j!  
 bih.biSizeImage=size; C'o64+W^  
 bih.biWidth=btm.bmWidth; WYEKf9}  
 bih.biXPelsPerMeter=0; iX2]VRNxl  
 bih.biYPelsPerMeter=0; ~e+\k>^eN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); j]aoR  
 static int filecount=0; w[I E  
 CString name; T`;%TO*Y  
 name.Format("pict%04d.bmp",filecount++); Z(ACc9k6:'  
 name=m_Path+name; /7t>TYip!  
 BITMAPFILEHEADER bfh; o!{w"K  
 bfh.bfReserved1=bfh.bfReserved2=0; 2M68CE  
 bfh.bfType=((WORD)('M'<< 8)|'B'); /p+>NZ"b  
 bfh.bfSize=54+size;  Pyb Z)5u  
 bfh.bfOffBits=54; ,z-}t& _t  
 CFile bf; }L#_\  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %Ntcvp)  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); uoX:^'q   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5`gQ~   
  bf.WriteHuge(lpData,size); *Of4o  
  bf.Close(); /iJ4{p   
  nCount++; (+FfB"3]  
 } CJJzCVj  
 GlobalFreePtr(lpData); :QB<?HaS'  
 if(nCount==1) g'V>_u#(  
  m_Number.Format("%d picture captured.",nCount); PSZL2iGj9V  
 else d [V;&U  
  m_Number.Format("%d pictures captured.",nCount); b{]z w pf  
  UpdateData(FALSE); Dm-zMCf}Q  
} 7lBAxqr2  
lJis~JLd`  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) bS"fkf9  
{ sSi6wO$  
 if(pMsg -> message == WM_KEYDOWN) ),ma_{$N  
 { >V*mr{/1  
  if(pMsg -> wParam == VK_ESCAPE) l33Pm/V2?  
   return TRUE; 2|}+T6_q  
  if(pMsg -> wParam == VK_RETURN) glF; e T  
   return TRUE; V&\[)D'c  
 } +(1zH-^.  
 return CDialog::PreTranslateMessage(pMsg); }9W4"e2)  
} fvF?{k>~}  
( 8c9 /7h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3T!lA  
{ 0QOBL'{7)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W^] 3XJP  
  SaveBmp(); I| b2acW  
  return FALSE; 6Qy@UfB  
} T2!6(, s9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ dK2p7xo  
 CMenu pop; 4*cU<  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :X]itTrGs  
 CMenu*pMenu=pop.GetSubMenu(0); 6DuEL=C  
 pMenu->SetDefaultItem(ID_EXITICON); KNLfp1!  
 CPoint pt; nEkR1^30  
 GetCursorPos(&pt); G6FEp`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9)gC6 IiW  
 if(id==ID_EXITICON) nY`RR C  
  DeleteIcon(); "G@g" gP  
 else if(id==ID_EXIT) ktdW`R\+  
  OnCancel(); FWHNj.r  
 return FALSE; dRaNzK)M  
} YGPy@-,E  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0 SNIYkGE  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) V` 1/SQX  
 AddIcon(); {'2@(^3  
 return res; 5_z33,q2  
} O2BDL1o  
(;57Vw  
void CCaptureDlg::AddIcon() +[tE^`-F  
{ 4@ML3d/  
 NOTIFYICONDATA data; S4h:|jLUF  
 data.cbSize=sizeof(NOTIFYICONDATA); D?8rO"  
 CString tip; K?zH35f$  
 tip.LoadString(IDS_ICONTIP); cvfr)K[0  
 data.hIcon=GetIcon(0); d~`x )B(  
 data.hWnd=GetSafeHwnd(); h}cy D7Wn  
 strcpy(data.szTip,tip); eZdu2.;<  
 data.uCallbackMessage=IDM_SHELL; ,;Hu=;  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; \&iP`v`K  
 data.uID=98; Ffv`kn@  
 Shell_NotifyIcon(NIM_ADD,&data); X~<("  
 ShowWindow(SW_HIDE); 3MY(<TGX  
 bTray=TRUE; nx^]>w  
} =UJ:tSr  
z3K6%rb-  
void CCaptureDlg::DeleteIcon() r.>].~}4  
{ '=G|Sq^aO  
 NOTIFYICONDATA data; L.1_(3NG  
 data.cbSize=sizeof(NOTIFYICONDATA); ]jaQ[g$F  
 data.hWnd=GetSafeHwnd(); V8HnUuz  
 data.uID=98; B,@c; K  
 Shell_NotifyIcon(NIM_DELETE,&data); \7l-@6 '7  
 ShowWindow(SW_SHOW); }`v~I4i  
 SetForegroundWindow(); 3`ELKq  
 ShowWindow(SW_SHOWNORMAL); }c`fW&  
 bTray=FALSE; OVko+X`  
} r]l!WRn  
UF<uU-C"  
void CCaptureDlg::OnChange() R&Jm +3N  
{ nZ@&2YPlem  
 RegisterHotkey(); 8&3V#sn'  
} u a~CEs  
5KDGSo  
BOOL CCaptureDlg::RegisterHotkey() QzzW x2  
{ {FIXc^m'  
 UpdateData(); %QKRFPYhS  
 UCHAR mask=0; a(9L,v#?  
 UCHAR key=0; _',prZ*  
 if(m_bControl) nM-h&na{s  
  mask|=4; 3&[>u;Bp  
 if(m_bAlt) DiEluA&w9  
  mask|=2; c=L2%XPP  
 if(m_bShift) 5K<5kHpvJ{  
  mask|=1; 2;^y4ssg  
  key=Key_Table[m_Key.GetCurSel()]; Nv/v$Z{k  
 if(bRegistered){ 0LfU=X0#7  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0em#-*|2"  
  bRegistered=FALSE; lmxr oHE  
 } g|<]B$yN#  
 cMask=mask; yfx7{naKC`  
 cKey=key; 9f',7i  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @ W^| ?  
 return bRegistered; P  '>SmQ  
} <0QH<4  
)~+e`q  
  四、小结 rfgI$eu   
Qum9A   
  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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