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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: jM\*A#Jo5  
  Q,80Hor#J  
  一、实现方法 IgC}&  
L<fvKmo(fw  
  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: JgHM?AWg|  
JMTvSXr  
#pragma data_seg("shareddata") n8. kE)?  
HHOOK hHook =NULL; //钩子句柄 SXt{k<|  
UINT nHookCount =0; //挂接的程序数目 Bn!$UUC  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >2By +/!X  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 cHa]xmy%r'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey t=xOQ 8  
static int KeyCount =0; ntmyNf?;  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 *28pRvY:b  
#pragma data_seg() `_&Vt=7lG  
RxQh2<?  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 ><=gV~7lx  
q{ O% |  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 8Dvazg}4  
@u1zB:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR v(p mI b{  
cKey,UCHAR cMask) ]^6c8sgnR  
{ ;U_QvN|  
 BOOL bAdded=FALSE; +S=Rn,  
 for(int index=0;index<MAX_KEY;index++){ w^]6w\p  
  if(hCallWnd[index]==0){ UQ4% Xp  
   hCallWnd[index]=hWnd; nJ" '  
   HotKey[index]=cKey; oTT7M`P3h  
   HotKeyMask[index]=cMask; _sbp6ZO_  
   bAdded=TRUE; sdS^e`S  
   KeyCount++; 5/O'R9A4  
   break; ++DG5`  
  } \cCV6A[  
 } =w$}m_AM  
 return bAdded; E_zIg+(+  
} 5^j45'%I  
//删除热键 xzx$TUL  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hI(SOsKs  
{ M'!U<Y -  
 BOOL bRemoved=FALSE; [b$4Shx  
 for(int index=0;index<MAX_KEY;index++){ ^gFqRbuS  
  if(hCallWnd[index]==hWnd){ is/scv<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ *OyHHq|>q  
    hCallWnd[index]=NULL; T\r@5Xv  
    HotKey[index]=0; ~/_SMPLo  
    HotKeyMask[index]=0; pa{re,O"e  
    bRemoved=TRUE; KWWa&[ev)  
    KeyCount--; 1nu^F,M  
    break; }@r{?8Ru  
   } Ve 4u +0  
  } )Jv[xY~  
 } kkK kf'  
 return bRemoved; t>H`X~SR?  
} K).n.:vYZ  
)IJQeC  
]f1{n  
  DLL中的钩子函数如下: YX*Qd$chZ  
OaL\w D^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7h)iu9j  
{ J "FC%\|  
 BOOL bProcessed=FALSE; :g.46dp4  
 if(HC_ACTION==nCode) Sua[O$  
 { +\r+n~w  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1J' 3g  
   switch(wParam) "al `$%(  
   {  )7:J[0ZiQ  
    case VK_MENU: o`.R!wm:W  
     MaskBits&=~ALTBIT; `N5|Ho*C  
     break; h`MF#617  
    case VK_CONTROL: _wdG|{px  
     MaskBits&=~CTRLBIT; 3su78et}  
     break; x1ztfJd  
    case VK_SHIFT: F!.E5<&7=  
     MaskBits&=~SHIFTBIT; wYlf^~#"  
     break; J6jwBo2m  
    default: //judge the key and send message u~)`&1{%  
     break; Y\0}R,]a-  
   } pZU9^Z?~6  
   for(int index=0;index<MAX_KEY;index++){ ci+tdMA  
    if(hCallWnd[index]==NULL) f$'2}'.!$  
     continue; CwJDmz\tk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ks\ NE=;5  
    { d9n?v)<v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); b<]n%Q'n  
     bProcessed=TRUE; PoIl>c1MS  
    } 1$*%"5a  
   } $\k0Nup}  
  } =rR~`  
  else if((lParam&0xc000ffff)==1){ //有键按下 DvM5 k  
   switch(wParam) 98.>e  
   { #M!!CX*k  
    case VK_MENU: Dk5Zh+^  
     MaskBits|=ALTBIT; 4hw@yTUo  
     break; 07Ed fe  
    case VK_CONTROL: ,<:!NF9  
     MaskBits|=CTRLBIT; _`#3f1F@[  
     break; ^`<w&I@  
    case VK_SHIFT: 2[gFkyqe  
     MaskBits|=SHIFTBIT;  ykrr2x  
     break; ujJI 1I  
    default: //judge the key and send message ` }3qhar  
     break; "YB** Y  
   } ?3O9eZY@  
   for(int index=0;index<MAX_KEY;index++){ eznypY=  
    if(hCallWnd[index]==NULL) 2<hpK!R  
     continue; h!m_PgRSs  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X=C1/4wU  
    { &[&r2 >a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0 u?{ \  
     bProcessed=TRUE; uf&N[M  
    } ^_ojR4  
   } HV/cc"  
  } dik9 >*"|o  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ` \A(9u*  
   for(int index=0;index<MAX_KEY;index++){ a {ab*tM  
    if(hCallWnd[index]==NULL) }^(}HBT  
     continue; .IJ_jt-^d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <x\7L2#p  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^'jEnN(  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 eh[_~>w  
   } we#wH-  
  } -n0C4kZ2o  
 } f7I{WfZ\P  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 76vy5R(.  
} Jxqh )l  
}$\M{# C~  
  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: "z<azs  
Va$Pi19 O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -8N|xQ378  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hd 0 'u  
NvN~@TL28  
  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: >{ me  
+ S4fGT  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Zatf9yGD  
{ qT/Do?Y  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ?b!Fa  
 { <|?K%FP7Z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 dCu'>G\bP  
  SaveBmp(); _uc\ D R  
  return FALSE; CDi<< ,  
 } *UW=Mdt  
 …… //其它处理及默认处理 S60IPya  
} p N\Vr8tJ  
>E,U>@+  
m4:^}O-#  
  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。 T}3v(6ew4  
bJ_cId8+  
  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。 gKg-O  
tb?YLxMV  
  二、编程步骤 tDDy]==E  
G4 G5PXi  
  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"; -{ u*qtp  
_hG;.=sr  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; r ]>\~&?^F  
+PK6-c\r  
  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; ,p;_\\<  
yFhB>i  
  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; e5Mln!.o  
d`d0 N5\  
  5、 添加代码,编译运行程序。 A?Wk  w f  
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三、程序代码 ,_ag;pt9)  
Dr;iQkGP  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL MlW 8t[  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _ IeU+tS  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 71C42=AU  
#if _MSC_VER > 1000 E| :!Q8"%w  
#pragma once joul<t-  
#endif // _MSC_VER > 1000 gh6d&ucQ^  
#ifndef __AFXWIN_H__ !AJ]j|@VBd  
#error include 'stdafx.h' before including this file for PCH Npn=cLC&  
#endif H.G!A6bd  
#include "resource.h" // main symbols KLC{7"6e)  
class CHookApp : public CWinApp TzBzEiANn  
{ 2l5KJlfj>k  
 public: c<#<k}y  
  CHookApp(); \M]-bw`  
  // Overrides ^Y{D^\} ,  
  // ClassWizard generated virtual function overrides *V(Fn-6(  
  //{{AFX_VIRTUAL(CHookApp) (qwdQMj`  
 public: 6b~28  
  virtual BOOL InitInstance(); <:8,niKtw  
  virtual int ExitInstance(); 6D;^uM2N  
  //}}AFX_VIRTUAL oPKXZU(c  
  //{{AFX_MSG(CHookApp) -RJE6~>'\  
  // NOTE - the ClassWizard will add and remove member functions here. &Np9kIMCB  
  // DO NOT EDIT what you see in these blocks of generated code ! @/%{15s.  
  //}}AFX_MSG <5@PWrU?[[  
  DECLARE_MESSAGE_MAP() nW?R"@Zm  
}; 69#8Z+dw7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); HEA eo!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); >5T_g2pkv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9j*0D("  
BOOL InitHotkey(); ) uP\>vRy  
BOOL UnInit(); kcB+_  
#endif &@3m -Z  
z&4~x!-_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. fRTo.u  
#include "stdafx.h" Mp\<cE  
#include "hook.h" 6aOp[-Le  
#include <windowsx.h> z1,tJH0  
#ifdef _DEBUG (bn Zy0  
#define new DEBUG_NEW + E"[  
#undef THIS_FILE \.e4.[%[2-  
static char THIS_FILE[] = __FILE__; #t!}K_  
#endif 6ri\>QrF  
#define MAX_KEY 100 *@V*~^V"J[  
#define CTRLBIT 0x04 VSOz.g>  
#define ALTBIT 0x02 vuz4qCQ  
#define SHIFTBIT 0x01 1@XgTL4  
#pragma data_seg("shareddata") z2/!m[U  
HHOOK hHook =NULL; "Mmf6hu  
UINT nHookCount =0; D&hqV)d4R  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Y|0ow_oH  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT VanB>|p6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }gf}eH  
static int KeyCount =0; `Iy4=nVb  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift p SN~DvR  
#pragma data_seg() b~7drf  
HINSTANCE hins; h7qBp300  
void VerifyWindow(); MEwdw3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) !F!3Q4  
//{{AFX_MSG_MAP(CHookApp) :u%$0p>  
// NOTE - the ClassWizard will add and remove mapping macros here. >CgO<\  
// DO NOT EDIT what you see in these blocks of generated code! \|Dei);k  
//}}AFX_MSG_MAP GO5~!g  
END_MESSAGE_MAP() %c^ m\ E  
yZ}d+7T}  
CHookApp::CHookApp() +~2rW8  
{ ,yLw$-  
 // TODO: add construction code here, iz}sM>^  
 // Place all significant initialization in InitInstance Qu{c B^Ga*  
} +_HdX w#  
~tm0QrJn/  
CHookApp theApp; ST8!i`Q$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7y*ZXT]f  
{ k3@HI|  
 BOOL bProcessed=FALSE; VGH/X.NJ  
 if(HC_ACTION==nCode) <rK=9"$y(t  
 { fAj2LAK  
  if((lParam&0xc0000000)==0xc0000000){// Key up >HkhAJhW  
   switch(wParam) M:ai<TZ]  
   { m$y]Lf  
    case VK_MENU: p {%t q$}.  
     MaskBits&=~ALTBIT; rPq<Xb\  
     break; #w3ru6*W  
    case VK_CONTROL: VTe.M[:  
     MaskBits&=~CTRLBIT; :X .,  
     break; Na!za'qk[o  
    case VK_SHIFT: OKwOugi0  
     MaskBits&=~SHIFTBIT; 0|)19LR  
     break; oJaAM|7uv  
    default: //judge the key and send message I>w^2 (y  
     break; 9Yw]Y5l  
   } WO%h"'iJ  
   for(int index=0;index<MAX_KEY;index++){ M/jb}*xDR  
    if(hCallWnd[index]==NULL) =L 0fZf  
     continue; fU*C/ d3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,9/5T:2  
    { Ex($  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6GOcI#C9C  
     bProcessed=TRUE; V; 9 }7mw  
    } <lFY7' aY  
   } m7 XjP2   
  } ~LE[, I:q  
  else if((lParam&0xc000ffff)==1){ //Key down |ViU4&d*  
   switch(wParam) RLKj u;u  
   { ~oi_r8 K  
    case VK_MENU: Rlc$; Z9K  
     MaskBits|=ALTBIT; rpU/s@%L  
     break; v}il(w;O  
    case VK_CONTROL: a[O6YgO  
     MaskBits|=CTRLBIT; cNP/<8dq  
     break; 0P 5BArJ?  
    case VK_SHIFT: kP,7Li\  
     MaskBits|=SHIFTBIT; :Z2tig nL  
     break; YQ,tt<CQ  
    default: //judge the key and send message By)3*<5a_  
     break; ]O@"\_}  
   } Xm[Czd]%  
   for(int index=0;index<MAX_KEY;index++) $U'3MEEw  
   { R+. Nn  
    if(hCallWnd[index]==NULL) }V^e7d  
     continue; WV_`1hZX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 52<~K  
    { SgSk !lj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +J40wFI:y  
     bProcessed=TRUE; _.f@Y`4d  
    } -^fzsBL.  
   } 1~qm+nET\  
  } d/B*  
  if(!bProcessed){ BRtXf0~&p  
   for(int index=0;index<MAX_KEY;index++){ *h,3}\  
    if(hCallWnd[index]==NULL) Dsb(CoWw  
     continue; me'(lQ6^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) w#{l 4{X|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); />Jm Rdf  
   } +L6" vkz  
  } rdI]\UH  
 } )<LI%dQ:'l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); +2O=s<fp  
} MuSaK %  
Es:6  
BOOL InitHotkey() z_(eQP])  
{ !"(u_dFw  
 if(hHook!=NULL){ 8?Wgawx  
  nHookCount++; |4xo4%BQ>  
  return TRUE; {"4<To]z  
 } P7>IZ >bw  
 else |LFUzq>j  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); H0tF  
  if(hHook!=NULL) 8m7eaZ  
   nHookCount++; /Su)|[/'  
  return (hHook!=NULL); e-!?[Ujv*%  
} "w^Nu6  
BOOL UnInit() & >b+loF  
{ =L16hDk o  
 if(nHookCount>1){ xvO 3BU~2  
  nHookCount--; _> Ln@  
  return TRUE; {jG.=}/Dk  
 } <rMv0y+r  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,9UCb$mh  
 if(unhooked==TRUE){ zn[QvY  
  nHookCount=0; '8Qw:fh  
  hHook=NULL; !Ud:?U  
 } >e_%M5 0  
 return unhooked; q4k`)?k9  
} k1wr/G'H[  
\Jf9npz3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) x,-S1[#X;  
{ Okoo(dfM  
 BOOL bAdded=FALSE; |<2 *v-a  
 for(int index=0;index<MAX_KEY;index++){ o#dcD?^  
  if(hCallWnd[index]==0){ cI3KB-lM#  
   hCallWnd[index]=hWnd; AJ4r/b }  
   HotKey[index]=cKey; Z*h ;e;  
   HotKeyMask[index]=cMask; :R3P 58>  
   bAdded=TRUE; #ZF>WoC@e?  
   KeyCount++; n\* JaY  
   break; 0k.v0a7%  
  } 9C?cm:  
 } Rd vn)K  
 return bAdded; Y'&8L'2Z[  
} v<+4BjV!J}  
QD}1?)}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U%n,XOJ  
{ p70,\&@3  
 BOOL bRemoved=FALSE; Y^X:vI  
 for(int index=0;index<MAX_KEY;index++){ 9 c6'  
  if(hCallWnd[index]==hWnd){ W{\EE[XhCf  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =1Ri]b  
    hCallWnd[index]=NULL; O*ImLR)i+s  
    HotKey[index]=0; 1M=   
    HotKeyMask[index]=0; iW;}%$lVX  
    bRemoved=TRUE; dWjx"7^  
    KeyCount--;  /+N|X  
    break; >.n;mk  
   } ennR@pg  
  } +>u>`|  
 } h$|3dz N  
 return bRemoved; pIvfmIm  
} 3)xbnRk  
8T<@ @6`T  
void VerifyWindow() >6k}HrS1V  
{ [Ek42%  
 for(int i=0;i<MAX_KEY;i++){ )ib7K1GJ  
  if(hCallWnd!=NULL){ :TlAL# s&  
   if(!IsWindow(hCallWnd)){ w)^\_uAlS  
    hCallWnd=NULL; 7|K3WuLL  
    HotKey=0; 7}A5u,.,ht  
    HotKeyMask=0; =g >.X9lr  
    KeyCount--; Pu-p7:99;'  
   } RP(a,D|  
  } KS?mw`Nr  
 } B%2L1T=  
} <_>.!9q  
(Hl8U  
BOOL CHookApp::InitInstance() &0JK38(  
{ Y+5"uq<'  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); hR!}u}ECd  
 hins=AfxGetInstanceHandle(); \hrrPPD1z  
 InitHotkey(); %N>\:8 5?  
 return CWinApp::InitInstance(); 8.[&wy U  
} })KJ60B  
nW~$ (Qnd  
int CHookApp::ExitInstance() di--:h/  
{ ,TEuM|  
 VerifyWindow(); _yNT=#/  
 UnInit(); LSSW.Oz2L  
 return CWinApp::ExitInstance(); %V31B\]Nz7  
} r?>Vx -  
IX"ZS  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file AvyQ4xim+  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6$;L]<$W>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ (*MNox?w  
#if _MSC_VER > 1000 Q js2hj-$  
#pragma once Sf=F cb  
#endif // _MSC_VER > 1000 O@nqHZ  
QH4k!^  
class CCaptureDlg : public CDialog TeKC} NW  
{ H_Iim[v#  
 // Construction Jc`Rs"2  
 public: \Bt =bu>Z  
  BOOL bTray; gxI&f  
  BOOL bRegistered; ~:T3|  
  BOOL RegisterHotkey(); r}ZLf  
  UCHAR cKey; c6t2Q6zV  
  UCHAR cMask; >6OCKl  
  void DeleteIcon(); pF|8OB%  
  void AddIcon(); *wV iH  
  UINT nCount; jYrym-  
  void SaveBmp(); ZH_FA  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor stX'yya  
  // Dialog Data {,i=>%X*  
  //{{AFX_DATA(CCaptureDlg) `b#/[3  
  enum { IDD = IDD_CAPTURE_DIALOG }; `'*F 1F  
  CComboBox m_Key; 2H[=l Y  
  BOOL m_bControl; D!X>O}  
  BOOL m_bAlt; "Ys_ \  
  BOOL m_bShift; 3\7'm]  
  CString m_Path; >vHH  
  CString m_Number;  qe[  
  //}}AFX_DATA VPWxHVf  
  // ClassWizard generated virtual function overrides aF,j J}On  
  //{{AFX_VIRTUAL(CCaptureDlg) 4g>1G qv6  
 public: jo<>Hc{g>  
  virtual BOOL PreTranslateMessage(MSG* pMsg); `E{;85bDH  
 protected: anK[P'Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support (~=Qufy  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); $< A8gTJ  
  //}}AFX_VIRTUAL T}V7SD.  
  // Implementation 03~+-h& n  
 protected: ^uC"dfH  
  HICON m_hIcon; CKx\V+\O  
  // Generated message map functions 4Y`! bT`  
  //{{AFX_MSG(CCaptureDlg) P\,F1N_?r  
  virtual BOOL OnInitDialog(); v$[ @]`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ooomi"u  
  afx_msg void OnPaint(); EW ~*@H  
  afx_msg HCURSOR OnQueryDragIcon(); fB_4f{E  
  virtual void OnCancel(); w}IL 8L(D  
  afx_msg void OnAbout(); 4Sg<r,G  
  afx_msg void OnBrowse(); \H,V 9!B  
  afx_msg void OnChange(); +]A+!8%Z  
 //}}AFX_MSG iPA@<D%  
 DECLARE_MESSAGE_MAP() -zPm{a  
}; F<h&3  
#endif $eK8GMxZ#  
J f\Qf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?nB he lW^  
#include "stdafx.h" (hpTJsZ  
#include "Capture.h" : [A?A4l  
#include "CaptureDlg.h" |}M~ kJ)  
#include <windowsx.h> <dq,y>  
#pragma comment(lib,"hook.lib") $/4Wod*l  
#ifdef _DEBUG h |s*i  
#define new DEBUG_NEW R'vdk<  
#undef THIS_FILE 3js)niT9u  
static char THIS_FILE[] = __FILE__; E^oEG4 X@  
#endif 3Qqnw{*  
#define IDM_SHELL WM_USER+1 "g x5XW&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @:S$|D~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yfPCGCOW?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H%*~l  
class CAboutDlg : public CDialog ^ze@#Cp  
{ j'G"ZPw1  
 public: {fAh@:{@  
  CAboutDlg(); (jp1; #P!  
  // Dialog Data {KW&wsI  
  //{{AFX_DATA(CAboutDlg) 6$W-?  
  enum { IDD = IDD_ABOUTBOX }; &Tf=~6  
  //}}AFX_DATA tfi2y]{A  
  // ClassWizard generated virtual function overrides B(S5+Y  
  //{{AFX_VIRTUAL(CAboutDlg) mJwv&E  
 protected: #B}BI8o (  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e 7Yb=/F  
  //}}AFX_VIRTUAL M \ :"~XW  
  // Implementation ?whRlh  
 protected: 3c1o,2  
  //{{AFX_MSG(CAboutDlg) 2z.k)Qx!Z  
  //}}AFX_MSG ^AovkK(p  
  DECLARE_MESSAGE_MAP() F7k4C2r  
}; C\;;9  
P Xyyyir{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?9o#%?6k  
{ 2&^,IIp  
 //{{AFX_DATA_INIT(CAboutDlg) $k a1X&f  
 //}}AFX_DATA_INIT +W V@o'  
} Iu=pk@*O  
C!aX45eg  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) D]t~S1ycG7  
{ n`FQgC  
 CDialog::DoDataExchange(pDX); F!z! :yp  
 //{{AFX_DATA_MAP(CAboutDlg) 2jI4V;H8g  
 //}}AFX_DATA_MAP 5O;/ lX!u  
} [i,5>YIk  
)a4E&D  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ,U|u-.~ZU  
 //{{AFX_MSG_MAP(CAboutDlg) Z&~k]R0y  
 // No message handlers =2ATqb"$w  
 //}}AFX_MSG_MAP kcg)_]~6  
END_MESSAGE_MAP() Wh#_9);  
y>)mSl@1y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w3>Y7vxiz`  
: CDialog(CCaptureDlg::IDD, pParent) ,gFL Wb`B'  
{ i~v@  
 //{{AFX_DATA_INIT(CCaptureDlg) [8V(N2  
  m_bControl = FALSE; TE*>a5C|  
  m_bAlt = FALSE; -~rr<D\  
  m_bShift = FALSE; &5kjjQ*HB  
  m_Path = _T("c:\\"); <a4 iL3  
  m_Number = _T("0 picture captured."); Vp- n(Z  
  nCount=0; 6E*Zj1KX  
  bRegistered=FALSE; Q%gY.n{=  
  bTray=FALSE; ~2, wI<Nz  
 //}}AFX_DATA_INIT Og&0Z)%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 18[?dV  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d\1:1ucV  
} IkE'_F  
ve64-D  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0ER6cTo-t  
{ 7|{%CckN  
 CDialog::DoDataExchange(pDX); ByB0>G''.  
 //{{AFX_DATA_MAP(CCaptureDlg) mCEKEX  
  DDX_Control(pDX, IDC_KEY, m_Key); 8KtF<`A)  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); .@x"JI> ;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 'vf,T4uQ"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,M+h9_&0?  
  DDX_Text(pDX, IDC_PATH, m_Path); rRA_'t;uK  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2WbZ>^:Nsk  
 //}}AFX_DATA_MAP `9G$p|6  
} +v`^_  
Z3u""oM/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) W~W?<%@  
//{{AFX_MSG_MAP(CCaptureDlg) *aSRKY  
 ON_WM_SYSCOMMAND() &CPe$'FYI  
 ON_WM_PAINT() Og%zf1)aZM  
 ON_WM_QUERYDRAGICON() eAenkUBz6,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Is,*qrl :  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^<5^9]x  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \fQgiX  
//}}AFX_MSG_MAP 1W6n[Xg  
END_MESSAGE_MAP() &H p\("  
9X^-)G>  
BOOL CCaptureDlg::OnInitDialog() J^<j=a|D  
{ |)>GeE  
 CDialog::OnInitDialog(); ><Mbea=U+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); q4IjCu+  
 ASSERT(IDM_ABOUTBOX < 0xF000); .J7-4  
 CMenu* pSysMenu = GetSystemMenu(FALSE); W4] 0qp`\  
 if (pSysMenu != NULL) 0ghwFo  
 { se*pkgWbz  
  CString strAboutMenu; 'Rar>oU  
  strAboutMenu.LoadString(IDS_ABOUTBOX); H'0J1\ h  
  if (!strAboutMenu.IsEmpty()) :,J86#S)  
  { |L~gNC  
   pSysMenu->AppendMenu(MF_SEPARATOR); w~FO:/  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9N3oVHc?  
  } .Q6{$Y%l  
 } '!|E+P-  
 SetIcon(m_hIcon, TRUE); // Set big icon TTw~.x,  
 SetIcon(m_hIcon, FALSE); // Set small icon  }@Ll!,  
 m_Key.SetCurSel(0); A.'`FtV  
 RegisterHotkey(); hTNYjXj  
 CMenu* pMenu=GetSystemMenu(FALSE); 7UEy L }N  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 1J!tcj1(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); HDfQ9__  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ">4[+'  
 return TRUE; // return TRUE unless you set the focus to a control k H( 3  
} 94>7-d  
:XZJxgx  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KG./<"c  
{ ?eg@ 7n  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (}7o a9Q<  
 { \FaB!7*~  
  CAboutDlg dlgAbout; 4j=@}!TBt  
  dlgAbout.DoModal(); #@OKp,LJ  
 } |H|eH~.yg&  
 else V'| g  
 { V[2<ha[n>  
  CDialog::OnSysCommand(nID, lParam); iz|9a|k6x  
 } *dn-,Q%`  
} 8aM% 9OU  
SUQ}^gn]  
void CCaptureDlg::OnPaint() Vm5P@RU$w;  
{ Yhv`IV-s  
 if (IsIconic()) -:1Gr8  
 { w]}cB+C+l#  
  CPaintDC dc(this); // device context for painting JeSkNs|vB  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 5;KT-(q~  
  // Center icon in client rectangle ;lPhSkD  
  int cxIcon = GetSystemMetrics(SM_CXICON);  3kzGL  
  int cyIcon = GetSystemMetrics(SM_CYICON); :WKyEt!3  
  CRect rect; ,C12SM*@  
  GetClientRect(&rect); (V |q\XS  
  int x = (rect.Width() - cxIcon + 1) / 2; Yv`1ySR  
  int y = (rect.Height() - cyIcon + 1) / 2; ]H@uuPT!  
  // Draw the icon (Gb{ckzs  
  dc.DrawIcon(x, y, m_hIcon); hE3jb.s(>  
 } qcoZ2VJ hh  
 else oeqJ?1=!  
 { w})&[d  
  CDialog::OnPaint(); W SeRV?+T  
 } $F'~^2  
} ?9.?w-Q'  
5<'Jd3N{&  
HCURSOR CCaptureDlg::OnQueryDragIcon() 74!JPOpQH  
{ uX 5B>32  
 return (HCURSOR) m_hIcon;  x+j/v5  
} 5D@Q1   
Q?'W >^*J  
void CCaptureDlg::OnCancel() Ra,on&OP`*  
{ O8}s*}]  
 if(bTray) U";Rp&\3;  
  DeleteIcon(); }lbx  
  CDialog::OnCancel(); o~z.7q  
} '{_tDboY  
AT8,9  
void CCaptureDlg::OnAbout() peP:5WB  
{ 5;%xqdD  
 CAboutDlg dlg; mgl' d  
 dlg.DoModal(); P_}_D{G  
} k/f_@8  
m>m`aLrnb  
void CCaptureDlg::OnBrowse() +GEKg~/4e  
{ |@4h z9~3  
 CString str; Kof-;T  
 BROWSEINFO bi; J'oz P^N  
 char name[MAX_PATH]; I,q~*d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Gl\RAmdc  
 bi.hwndOwner=GetSafeHwnd(); >L3p qK   
 bi.pszDisplayName=name; S6Xw+W02  
 bi.lpszTitle="Select folder"; S)1:*>@  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @n y{.s+  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +hYmL Sq  
 if(idl==NULL) '3 ,JL!  
  return; -cS4B//IK8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2yg'?tpj  
 str.ReleaseBuffer(); A=>6$L];'  
 m_Path=str; lIT2 AFX+  
 if(str.GetAt(str.GetLength()-1)!='\\') p~y 4q4  
  m_Path+="\\"; yOm6HA``hT  
 UpdateData(FALSE); k$m X81  
} [&59n,R`  
 )"Yah  
void CCaptureDlg::SaveBmp() zL=I-fVq  
{ I(eR3d:  
 CDC dc; 1>*<K/\qg  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &?6 ~v  
 CBitmap bm; j7%%/%$o[  
 int Width=GetSystemMetrics(SM_CXSCREEN); trA `l/  
 int Height=GetSystemMetrics(SM_CYSCREEN); EG=>F1&M  
 bm.CreateCompatibleBitmap(&dc,Width,Height); E&=?\KM  
 CDC tdc; :)S4MoG  
 tdc.CreateCompatibleDC(&dc); X%qR6mMfT7  
 CBitmap*pOld=tdc.SelectObject(&bm); x{w?X.Nt  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ph.:~n>z  
 tdc.SelectObject(pOld); $B N+SD!  
 BITMAP btm; (9QRg;   
 bm.GetBitmap(&btm); jWjK-q@Y  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; }|,\ ?7,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); KPK!'4,cu  
 BITMAPINFOHEADER bih; 3om7LqcRo  
 bih.biBitCount=btm.bmBitsPixel; biuo.OG]  
 bih.biClrImportant=0; ]nGA1S{  
 bih.biClrUsed=0; "s^@PzQpN  
 bih.biCompression=0; ;^SgV   
 bih.biHeight=btm.bmHeight; 3W00,f^9  
 bih.biPlanes=1; KV(W|~+rM  
 bih.biSize=sizeof(BITMAPINFOHEADER); LA3,e (e  
 bih.biSizeImage=size; T"lqPbK  
 bih.biWidth=btm.bmWidth; MO+0]uh:  
 bih.biXPelsPerMeter=0; 6:X\vw  
 bih.biYPelsPerMeter=0; iC\=U  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); lJ2/xE]  
 static int filecount=0; S;kc{?   
 CString name; h(K4AiGE  
 name.Format("pict%04d.bmp",filecount++); %5w)}|fw  
 name=m_Path+name; yL,B\YCf8  
 BITMAPFILEHEADER bfh; 1Vvx@1  
 bfh.bfReserved1=bfh.bfReserved2=0; M& L0n%,y5  
 bfh.bfType=((WORD)('M'<< 8)|'B'); MH(g<4>*  
 bfh.bfSize=54+size; Y& %0 eI!  
 bfh.bfOffBits=54; UYLI>XSd  
 CFile bf; dXN&<Q,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?XrTZ{5'  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); {x$#5 PW  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6XqO' G  
  bf.WriteHuge(lpData,size); JH, +F  
  bf.Close(); 2,`mNjHh  
  nCount++; ;hp; Rd  
 } 'KrkC A  
 GlobalFreePtr(lpData); \Fjq|3`<l  
 if(nCount==1) mSp7H!  
  m_Number.Format("%d picture captured.",nCount); ?NeB_<dLa`  
 else {[#  
  m_Number.Format("%d pictures captured.",nCount); !7|9r$  
  UpdateData(FALSE); BE;iC.rW  
} ou4?`JF)-  
^DJ U99  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T!$HVHh&,}  
{ LZ$!=vg4  
 if(pMsg -> message == WM_KEYDOWN) Qk?Jy<Ra  
 { , X):2_m  
  if(pMsg -> wParam == VK_ESCAPE) < duM8   
   return TRUE; *Ux"3IXO  
  if(pMsg -> wParam == VK_RETURN) [X\2U4  
   return TRUE; X:bgY  
 } I#%-A  
 return CDialog::PreTranslateMessage(pMsg); cV,URUD  
} KLB?GN?Pb  
j R:Fih-}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~<-h# B  
{ SJe;T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 1EB`6_>y  
  SaveBmp(); s^< oU  
  return FALSE; P]^] T}5  
} J]e&z5c  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2j|Eh   
 CMenu pop; ".=EAXVU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); v-@@>?W-  
 CMenu*pMenu=pop.GetSubMenu(0); j$Co-b1  
 pMenu->SetDefaultItem(ID_EXITICON); p `Z7VG  
 CPoint pt; 21Opx~T3  
 GetCursorPos(&pt); /GNYv*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Gd 9B  
 if(id==ID_EXITICON) /qr8  
  DeleteIcon(); <taW6=;c  
 else if(id==ID_EXIT) tcZ~T  
  OnCancel(); ggWfk  
 return FALSE; dDn:^)  
} 4G2V{(@QiZ  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \v_( *  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) A5\S0l$Q  
 AddIcon(); ?U[AE -*  
 return res; L x&ZWF$  
} XFYl[?`G  
X8TZePh  
void CCaptureDlg::AddIcon() [)?3Dp|MH  
{ G@2M&0'  
 NOTIFYICONDATA data;  (w fZ!  
 data.cbSize=sizeof(NOTIFYICONDATA); =XB)sC%  
 CString tip; ce\-oT  
 tip.LoadString(IDS_ICONTIP); I_Qnq4Sk(  
 data.hIcon=GetIcon(0); ,GlK_-6>  
 data.hWnd=GetSafeHwnd(); f #14%?/  
 strcpy(data.szTip,tip); Dc2eY.  
 data.uCallbackMessage=IDM_SHELL; 7085&\9  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; agzG  
 data.uID=98; YXEZ&$e'  
 Shell_NotifyIcon(NIM_ADD,&data); jXQ_7  
 ShowWindow(SW_HIDE); Q)/q h;R u  
 bTray=TRUE; -0{WB(P  
} ZVL0S{V-mh  
f]ef 1#  
void CCaptureDlg::DeleteIcon() E'}$'n?:  
{ .[! ^ L  
 NOTIFYICONDATA data; |iI`p-L9  
 data.cbSize=sizeof(NOTIFYICONDATA); _!ed.h.r:  
 data.hWnd=GetSafeHwnd(); ;K!Or  
 data.uID=98; Z:{Z&HQC  
 Shell_NotifyIcon(NIM_DELETE,&data); Z^'; xn  
 ShowWindow(SW_SHOW);  AHb   
 SetForegroundWindow(); K.SHY!U}  
 ShowWindow(SW_SHOWNORMAL); [%pZM.jFO  
 bTray=FALSE; ObUQB+  
} i`X{pEKP+  
f~Su F,o@h  
void CCaptureDlg::OnChange() O(VV-n7U  
{ X"]ZV]7(]s  
 RegisterHotkey(); 'n=D$j]X  
} }Z|a?J@CZm  
slbV[xR  
BOOL CCaptureDlg::RegisterHotkey() ~F-,Q_|-  
{ >JhQ=j  
 UpdateData(); 6{6tg>|L)  
 UCHAR mask=0; %F7k| Na  
 UCHAR key=0; ]z,?{S  
 if(m_bControl) ScD9Ct*):C  
  mask|=4; n9%rjS$  
 if(m_bAlt) 6=FuH@Q&  
  mask|=2; G(- `FH  
 if(m_bShift) wFD .3!  
  mask|=1; 0;9 LIL5  
  key=Key_Table[m_Key.GetCurSel()]; sq%f%?(V  
 if(bRegistered){ 0IZV4{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); vzU%5,  
  bRegistered=FALSE; [,c>-jA5  
 } NTC,Vr\A  
 cMask=mask; S/4k fsN  
 cKey=key; !PgYn  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); oUqNA|l T  
 return bRegistered; ;AaF;zPV  
} \n5,!,A  
8`D_"3j3g\  
  四、小结 n~h%K7 c  
@AwH?7(b  
  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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