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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: f tW-  
  V(Ll]g/T_;  
  一、实现方法 PjZsMHW%  
Ag=>F5  
  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:  ZaJg$  
mne4uW  
#pragma data_seg("shareddata") - y[nMEE  
HHOOK hHook =NULL; //钩子句柄  (c;F%m|  
UINT nHookCount =0; //挂接的程序数目 rZ`ob x\S  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9r.Os  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 N"SFVc_2  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |}N -5U  
static int KeyCount =0; Zg1=g_xY  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Rd~-.&   
#pragma data_seg() 9/3gF)I}  
xtW Q.  
  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。 &}:'YK*X  
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  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: o))z8n?b  
m  "'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR d_s=5+Yj  
cKey,UCHAR cMask) L+,p#w  
{ %+gYZv-  
 BOOL bAdded=FALSE; =Hplg>h)  
 for(int index=0;index<MAX_KEY;index++){ i]&C=X  
  if(hCallWnd[index]==0){ ! J`>;&  
   hCallWnd[index]=hWnd; &nkYJi(!  
   HotKey[index]=cKey; Hhx"47:  
   HotKeyMask[index]=cMask; U;QTA8|!&  
   bAdded=TRUE; A+P9M \u.  
   KeyCount++; \6o%gpUkD  
   break; 2F9Gx;}t5=  
  } J%ng8v5ex  
 } kt?G\H!}  
 return bAdded; y%%D="  
} {FRUB(68b  
//删除热键 )D'SfNx#{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^o&3+s} M  
{ G J"S*30  
 BOOL bRemoved=FALSE; gDbj!(tm  
 for(int index=0;index<MAX_KEY;index++){ dsck:e5agZ  
  if(hCallWnd[index]==hWnd){ V4I5PPz~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 02B *cz_K  
    hCallWnd[index]=NULL; 50r3Kl0  
    HotKey[index]=0; vN#?>aL  
    HotKeyMask[index]=0; 0#1hkJ"  
    bRemoved=TRUE; 'J\nvNm  
    KeyCount--; Fy:CG6@X  
    break; ]@E_Hx{S  
   } mQEE?/xX;  
  } +KV?W+g)`  
 } NG3!09eY  
 return bRemoved; vbEAd)*S  
} N{oi }i6  
; kPx@C   
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  DLL中的钩子函数如下: k1Z"Qmz  
f_A'.oq+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }AfX0[!O  
{ qw^kA?  
 BOOL bProcessed=FALSE; `pr$l  
 if(HC_ACTION==nCode) 7#/->Y  
 { U9w0kcUw#J  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 #r5IwyL  
   switch(wParam) (gW#T\Eln  
   {  t~vOm   
    case VK_MENU: ,U`:IP/L  
     MaskBits&=~ALTBIT; -u)f@e  
     break; =' %r"_`}  
    case VK_CONTROL: P5$d#Y(=  
     MaskBits&=~CTRLBIT; 0 D^d-R,  
     break; fny|^F]w  
    case VK_SHIFT: BK>3rjXi>a  
     MaskBits&=~SHIFTBIT; {jz?LM  
     break; O^|:q  
    default: //judge the key and send message ]b5E_/P  
     break; eCejO59F9  
   } iCd$gwA>F  
   for(int index=0;index<MAX_KEY;index++){ Pw c)u&  
    if(hCallWnd[index]==NULL) GD(gm, ,)  
     continue; z =m Dd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _:dt8+T#  
    { =QdHji/sB  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); RRSkXDU}  
     bProcessed=TRUE; q8DSKi  
    } ,uz+/K%OA5  
   } } @r|o:I  
  } nV`n=x  
  else if((lParam&0xc000ffff)==1){ //有键按下 DX3xWdnr  
   switch(wParam) Xn:5pd;?B6  
   { WFHS8SI  
    case VK_MENU: m@(8-_  
     MaskBits|=ALTBIT; |#OMrP+oi  
     break; sA^_I6>M"  
    case VK_CONTROL: dU4  h  
     MaskBits|=CTRLBIT; @34Z/%A  
     break; {B;<R1  
    case VK_SHIFT: tjONN(K`  
     MaskBits|=SHIFTBIT; {?X#E12vf  
     break; d}d1]@Y\  
    default: //judge the key and send message jVW .=FK  
     break; C1V:_-  
   } (i3V  
   for(int index=0;index<MAX_KEY;index++){ ]IF QD  
    if(hCallWnd[index]==NULL) \/qo2'V j`  
     continue; B!PT|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <V`1?9c7D1  
    { sY|by\-c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |4E5x9J  
     bProcessed=TRUE; WA'4y\N  
    } 4k$i:st;  
   } ;dC>$_P?  
  } 0cGO*G2Xr  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 b\{34z,  
   for(int index=0;index<MAX_KEY;index++){ =`&7pYd,  
    if(hCallWnd[index]==NULL) :A,g:B  
     continue; [nSlkl   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mZ%"""X\Ei  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4O I''i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 v@xbur\L  
   } R=7,F6.  
  } nky%Eb[\  
 } 8%+F.r  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3bWYRW  
} )Bz2-|\  
/5**2Kgv1  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: J&hzr t  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M53{e;.kN  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w(,K  
'R-Ly^:Qd  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: CIt%7 \c  
1\t#*N  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) < bvbfS  
{ 4z;@1nN_8a  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \zx &5a #  
 { {zck Y  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7O.?I# 76  
  SaveBmp(); HpXQ D;  
  return FALSE; )2pOCAjL2  
 } p1BMQ?=($  
 …… //其它处理及默认处理 MBIlt 1P  
} hRU5CH/!  
v47S9Vm+  
V(6*wQ`&  
  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。 "e-RV  
"VIoV u  
  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。 KfPYH\ 0  
e> zv+9'Q  
  二、编程步骤 eb ` !  
Rfx}[!<{N  
  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"; Y5/SbQYf1  
uc~/l4~N  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; {0(:5%  
)'1rZb5  
  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; ^ ,cwm:B@  
RV=Z$  
  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; .="/n8B  
V7gv@<1<y  
  5、 添加代码,编译运行程序。 L vPcH  
&s{" Vc9]  
三、程序代码 yIq. m=  
7{BTtUMAC  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL &^7^7:Y=?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Yk^clCB{A(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ prdc}~J8{  
#if _MSC_VER > 1000 RV_(T+  
#pragma once \jpm   
#endif // _MSC_VER > 1000 _\ &N<  
#ifndef __AFXWIN_H__ vyA `Z1  
#error include 'stdafx.h' before including this file for PCH hI#1Ybl  
#endif }x~1w:z Hd  
#include "resource.h" // main symbols yKhN1kY  
class CHookApp : public CWinApp /cXVJ(#j  
{ )IFFtU~,  
 public: au;ZAXM|  
  CHookApp(); (DnrJ.QU}t  
  // Overrides 2?}5U)Hg  
  // ClassWizard generated virtual function overrides \RF{ITV$kD  
  //{{AFX_VIRTUAL(CHookApp) LkwjEJQf  
 public: sX c|++  
  virtual BOOL InitInstance(); h>:eu#  
  virtual int ExitInstance(); +7V4mF!u  
  //}}AFX_VIRTUAL }o:sU^Pwa  
  //{{AFX_MSG(CHookApp) >qL-a*w:a  
  // NOTE - the ClassWizard will add and remove member functions here. 2R`dyg  
  // DO NOT EDIT what you see in these blocks of generated code ! ?= R C?K  
  //}}AFX_MSG vU9j|z  
  DECLARE_MESSAGE_MAP() MXP3Z N'  
}; + FG Xx  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); X+%5q =N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s[n*fV']A  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1w$X;q"  
BOOL InitHotkey(); wfMtWXd;KB  
BOOL UnInit(); ]n 'FD|  
#endif L5RBe  
1 k\~%  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. uLq%Nu  
#include "stdafx.h" S2\|bs7;J,  
#include "hook.h" %2ZWSQD  
#include <windowsx.h> [dIlt"2fV  
#ifdef _DEBUG *RllKPY)  
#define new DEBUG_NEW  KB5<)[bs  
#undef THIS_FILE q(s&2|  
static char THIS_FILE[] = __FILE__; W }  
#endif -L6V)aK&  
#define MAX_KEY 100 ) OE!vA  
#define CTRLBIT 0x04 r^ Mu`*x*  
#define ALTBIT 0x02 Ls2g#+  
#define SHIFTBIT 0x01 *%aWGAu:  
#pragma data_seg("shareddata") Z[GeU>?P  
HHOOK hHook =NULL; 5<77o|  
UINT nHookCount =0; KM9)  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey tPz!C&.=  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT nsjrzO79L8  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 2_C&p6VGj  
static int KeyCount =0; A>B_~=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \1f&D!F]b  
#pragma data_seg() mGC!7^_D`  
HINSTANCE hins; d+L!s7  
void VerifyWindow(); QT)5-Jy  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 1=Y pNXX  
//{{AFX_MSG_MAP(CHookApp) Z[%vO?,  
// NOTE - the ClassWizard will add and remove mapping macros here. yk0#byW`  
// DO NOT EDIT what you see in these blocks of generated code! SLjSNuOP  
//}}AFX_MSG_MAP py%_XL=w,  
END_MESSAGE_MAP() slH3c:j\  
]1dnp]r  
CHookApp::CHookApp() @#1T-*  
{ =2&Sw(6j  
 // TODO: add construction code here, l|" SM6  
 // Place all significant initialization in InitInstance e .(  
} iji2gWV}h  
H6 V!W\:s  
CHookApp theApp; 9~|hGo  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) PCX X[N  
{ h 7  c  
 BOOL bProcessed=FALSE; E,gpi  
 if(HC_ACTION==nCode) Bxf]Lu,\U@  
 { v[!ZRwk4w3  
  if((lParam&0xc0000000)==0xc0000000){// Key up Xo/0lT  
   switch(wParam) 'FC#O%l  
   { }~+_|  
    case VK_MENU: Uy;e5<<  
     MaskBits&=~ALTBIT; U%4 s@{7  
     break; ATkx_1]KM-  
    case VK_CONTROL: )9~-^V0A^>  
     MaskBits&=~CTRLBIT; t_NnQ4)=  
     break; vE$n0bL2  
    case VK_SHIFT: :&\^r=D  
     MaskBits&=~SHIFTBIT; iT,Ya-9"  
     break; =&x u"V  
    default: //judge the key and send message met`f0jw  
     break; 0~=>:^H'`q  
   } JL:\\JT.  
   for(int index=0;index<MAX_KEY;index++){ <wj}y0(  
    if(hCallWnd[index]==NULL) QQW]j;'~  
     continue; oeF0t'%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~Blsj9a2  
    { }:xj%?ki  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); x2$Y"b?vz  
     bProcessed=TRUE; MgrJ ;?L  
    } 4) z*Vux  
   } 5169E*  
  } #4wia%}u  
  else if((lParam&0xc000ffff)==1){ //Key down  r NT>{  
   switch(wParam) a8v9j3.  
   { Wo, "$Z6B  
    case VK_MENU: K;P<c,9X/  
     MaskBits|=ALTBIT; ;pVnBi  
     break; -XMWN$Ah  
    case VK_CONTROL: ^w+)A;?W  
     MaskBits|=CTRLBIT; DUlvlQW  
     break; yd~}CF  
    case VK_SHIFT: P{[@t_  
     MaskBits|=SHIFTBIT; mgI7zJX  
     break; $I4:g.gKpG  
    default: //judge the key and send message Og/@w&  
     break; mj|TWDcj+  
   } <}n"gk1is  
   for(int index=0;index<MAX_KEY;index++) \\v1 \  
   { 54>gr1B  
    if(hCallWnd[index]==NULL) z z2'h>  
     continue; WOR H4h9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZK$<"z6{  
    { bP HtP\)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~F^7L5d}C  
     bProcessed=TRUE; BaXf=RsZ  
    } ]>H'CM4JR  
   } [*W l=  
  } )Nkf'&  
  if(!bProcessed){ I*OJPFZ^4  
   for(int index=0;index<MAX_KEY;index++){ QNxY`  
    if(hCallWnd[index]==NULL)  Mcm%G#  
     continue; L)-1( e<x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) TV[@!E a  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G Q])y  
   } 1<$z-y'  
  }  ;)ji3M  
 } DWmViuZmL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); dvPlKLp  
} ||o :A  
D{G~7P\.  
BOOL InitHotkey() &N|`Q (QXS  
{ {"n=t`E)3  
 if(hHook!=NULL){ &KP JB"0L  
  nHookCount++; x) OJ?l  
  return TRUE; 3Sl2c  
 } R,f"2 k  
 else j5~nLo2  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); apw/nhQ.[  
  if(hHook!=NULL) |]+PDc%  
   nHookCount++; \Rz-*zr&  
  return (hHook!=NULL); y6`zdB  
} Z?j4WJy-[  
BOOL UnInit() #"KaRh  
{ `Yw:<w\4C  
 if(nHookCount>1){ KreF\M%Ke  
  nHookCount--; 5sI9GC  
  return TRUE; 9ELRn@5.  
 } y_}jf,b4  
 BOOL unhooked = UnhookWindowsHookEx(hHook); _8ubo\M~  
 if(unhooked==TRUE){ /& wA$h  
  nHookCount=0; /@feY?glc  
  hHook=NULL; &)GlLpaT  
 } P)rz%,VF+  
 return unhooked; _t.Ub:  
} M~LYq  
T%[!m5   
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Z<W`5sop^  
{ o*Kl`3=]  
 BOOL bAdded=FALSE; .XPPd?R  
 for(int index=0;index<MAX_KEY;index++){ c(r8 F[4w  
  if(hCallWnd[index]==0){ zelM}/d  
   hCallWnd[index]=hWnd; ;|AyP  
   HotKey[index]=cKey; B~7]x;8h  
   HotKeyMask[index]=cMask; WeE1 \  
   bAdded=TRUE; 141XnAb)I  
   KeyCount++; st-I7K\v  
   break; f\h|Z*Bv  
  } %IH ra6  
 } 3U&r K)F  
 return bAdded; Bl*.N9*  
} ZP;WXB`  
t^SND{[WcM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]B=2r^fn  
{ .$N8cYu0  
 BOOL bRemoved=FALSE; 3Q~zli:  
 for(int index=0;index<MAX_KEY;index++){ p}d+L{"V  
  if(hCallWnd[index]==hWnd){ R/@n+tb e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p$1y8Zbor  
    hCallWnd[index]=NULL; H0?Vq8I?  
    HotKey[index]=0; BX-fV|  
    HotKeyMask[index]=0; >%i]p  
    bRemoved=TRUE; &.)ST0b4  
    KeyCount--; z%~rQa./$  
    break; 7xoq:oP-}N  
   } K} TSwY  
  } xF])NZy|  
 } #S') i1 ;  
 return bRemoved; U2kl-E:  
} thrv_^A  
XG;Dj<Dm  
void VerifyWindow() |[/'W7TV%?  
{ r9!,cs  
 for(int i=0;i<MAX_KEY;i++){ <) VNEy'  
  if(hCallWnd!=NULL){ vCsJnKqK  
   if(!IsWindow(hCallWnd)){ .kZ<Q]Vk  
    hCallWnd=NULL; -PLh|  
    HotKey=0; MHF7hk ps}  
    HotKeyMask=0; r l>e~i  
    KeyCount--; B'!I{LC  
   } gib'f@i;  
  } S/)yi  
 } | rwx; +  
} 9MUg/  
p n(y4we  
BOOL CHookApp::InitInstance() 4StoEgFS  
{ ;$/]6@bqB  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5[|ZceY  
 hins=AfxGetInstanceHandle(); 'NSfGC%7R  
 InitHotkey(); &9Xn:<"`)  
 return CWinApp::InitInstance(); !G~`5?CvE  
} #kRt\Fzq  
7O\Qxc\  
int CHookApp::ExitInstance() CjZIBMGc  
{ 6![}Jvu>  
 VerifyWindow(); QM4O|x[   
 UnInit(); Bf8[(oc~  
 return CWinApp::ExitInstance(); f2G 3cg~H  
} I,@ 6w  
Tjj-8cg  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file O 2W2&vY  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) %1z`/B  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _l{_n2D-  
#if _MSC_VER > 1000 U_<k*o@:  
#pragma once y?ypRCgO.u  
#endif // _MSC_VER > 1000 HA]5:ck  
VX]Ud\(  
class CCaptureDlg : public CDialog -E>LB\[t)  
{ `tH :oP0=  
 // Construction A!IZIT5)m  
 public: y[d>7fcf  
  BOOL bTray; KkyZd9  
  BOOL bRegistered; 'QQa :3<x  
  BOOL RegisterHotkey(); WWN2  
  UCHAR cKey; l?:S)[:  
  UCHAR cMask; s>ohXISB[  
  void DeleteIcon(); (\M+E tU<9  
  void AddIcon(); buA/G-<e  
  UINT nCount; IyoitIbLl  
  void SaveBmp(); "mB /"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor bD<hzOa  
  // Dialog Data H-jxH,mJmW  
  //{{AFX_DATA(CCaptureDlg) (Ky$(Ubb#6  
  enum { IDD = IDD_CAPTURE_DIALOG }; JGQ)/(  
  CComboBox m_Key; ,)Z1&J?  
  BOOL m_bControl; *Z2#U ?_  
  BOOL m_bAlt; +XpQ9Cd  
  BOOL m_bShift; !MEA@^$#  
  CString m_Path; aqKrf(Rv  
  CString m_Number; rHJtNN8$k  
  //}}AFX_DATA (Z?g^kjq)  
  // ClassWizard generated virtual function overrides Dgm"1+  
  //{{AFX_VIRTUAL(CCaptureDlg) (gjCm0#_%  
 public: b0uWUI(=  
  virtual BOOL PreTranslateMessage(MSG* pMsg); uy8mhB+]  
 protected: !m6=Us  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s(cC ;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); W ![*0pL  
  //}}AFX_VIRTUAL ?$~5ti#\  
  // Implementation Q&8epO|J  
 protected: 5;X3{$y  
  HICON m_hIcon; qv)%)n  
  // Generated message map functions g [c ^7  
  //{{AFX_MSG(CCaptureDlg) {"mb)zr  
  virtual BOOL OnInitDialog(); >N-l2?rE  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ".sRi  
  afx_msg void OnPaint(); kS< 9cy[O  
  afx_msg HCURSOR OnQueryDragIcon(); nJcY>Rp?  
  virtual void OnCancel(); QS%t:,0lp  
  afx_msg void OnAbout(); z@U5  
  afx_msg void OnBrowse(); j6#Vwcr  
  afx_msg void OnChange(); To =JE}jzo  
 //}}AFX_MSG =PYS5\k  
 DECLARE_MESSAGE_MAP() CSlPrx2\  
}; |Pq z0n=v  
#endif ]:svR@E  
O7z5,-  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file {9XQ~t"m^  
#include "stdafx.h" H&uh$y@  
#include "Capture.h" s7s@!~  
#include "CaptureDlg.h" lX/:e=  
#include <windowsx.h> wG X\ub#!  
#pragma comment(lib,"hook.lib") Bj* M W  
#ifdef _DEBUG  |Fe*t  
#define new DEBUG_NEW Huf;A1.  
#undef THIS_FILE :ioD  *k  
static char THIS_FILE[] = __FILE__; E{]PfUfFY  
#endif D| g{]nO  
#define IDM_SHELL WM_USER+1 5E0dX3-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d/lV+yZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); pReSvF}}C  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; M"5S  
class CAboutDlg : public CDialog !NTt' 4/F{  
{ PE<(eIr  
 public: jPEOp#C  
  CAboutDlg(); S^_F0</U,  
  // Dialog Data @waY+sqt=  
  //{{AFX_DATA(CAboutDlg) S=qx,<J 39  
  enum { IDD = IDD_ABOUTBOX }; 2 >/}-a  
  //}}AFX_DATA QSyPtjg]  
  // ClassWizard generated virtual function overrides iyP0;$  
  //{{AFX_VIRTUAL(CAboutDlg) kerBy\^  
 protected: TnJJ& "~3b  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I\@`AU  
  //}}AFX_VIRTUAL S3ZI C\2  
  // Implementation >r.W \  
 protected: 0X4I-xx#  
  //{{AFX_MSG(CAboutDlg) b=XHE1^rM  
  //}}AFX_MSG 4nKlW_{,  
  DECLARE_MESSAGE_MAP() f}cCnJK  
}; r=S,/N(1  
rkn'1M&u  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ?63ep:QEk  
{ $lb$<  
 //{{AFX_DATA_INIT(CAboutDlg) ,tak{["  
 //}}AFX_DATA_INIT 3]h*6 V1$  
} t(p}0}Pp  
DVjwY_nG7  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) fT.MglJcb  
{ Zw_'u=r >  
 CDialog::DoDataExchange(pDX); 75eZhs[b  
 //{{AFX_DATA_MAP(CAboutDlg) o8fY!C)  
 //}}AFX_DATA_MAP x+EEMv3u:  
} 6Cgc-KNbk  
 NR98]X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ftD(ed  
 //{{AFX_MSG_MAP(CAboutDlg) Y{9xF8#  
 // No message handlers }70A>JBw  
 //}}AFX_MSG_MAP tv%B=E!r  
END_MESSAGE_MAP() #3_ @aq*  
d[oHjWk  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) f7:}t+d  
: CDialog(CCaptureDlg::IDD, pParent) ;lf$)3%[  
{ lPw`KW  
 //{{AFX_DATA_INIT(CCaptureDlg) k(M(]y_  
  m_bControl = FALSE; _ O;R  
  m_bAlt = FALSE; ^/~C\ (  
  m_bShift = FALSE; ;),vUu,k  
  m_Path = _T("c:\\"); GQDW}b8  
  m_Number = _T("0 picture captured."); A+hA'0isF@  
  nCount=0; aUq 2$lw1  
  bRegistered=FALSE; 1u~a*lO}  
  bTray=FALSE; 5em*9Ko  
 //}}AFX_DATA_INIT j7~Rw"(XQc  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e?+&2zMq  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); QypUBf  
} #'BPW<Ob  
8wMwS6s:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <YvW /x  
{ a"^rOiXR{  
 CDialog::DoDataExchange(pDX); CIj7' V  
 //{{AFX_DATA_MAP(CCaptureDlg) ]A:8x`z#F  
  DDX_Control(pDX, IDC_KEY, m_Key);  ^w_\D?  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =3EjD;2  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 'oF XNO  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); }#6~/ W  
  DDX_Text(pDX, IDC_PATH, m_Path); i':a|#e>  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Mb-AzGsV  
 //}}AFX_DATA_MAP fWyXy%Qq  
} Mk}*ze0%  
+asO4'r  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) TT={>R[B  
//{{AFX_MSG_MAP(CCaptureDlg) hG >kx8h  
 ON_WM_SYSCOMMAND() 3 J5lz~6  
 ON_WM_PAINT() 1} ~`g ED  
 ON_WM_QUERYDRAGICON() m]Mm (7v(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) D B(!*6#?  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) v^B2etiX_  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ^O,r8K{1n  
//}}AFX_MSG_MAP 9# #(B  
END_MESSAGE_MAP() *d9RD~Ee  
Z29aRi  
BOOL CCaptureDlg::OnInitDialog() #fb &51  
{ "(Nt9K%P)  
 CDialog::OnInitDialog(); K94bM5O 1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 1p8hn!V  
 ASSERT(IDM_ABOUTBOX < 0xF000); T\"-q4+=C  
 CMenu* pSysMenu = GetSystemMenu(FALSE); (wf3HEb_  
 if (pSysMenu != NULL) &]pY~zVc  
 { *W2o$_Hs  
  CString strAboutMenu; c$x >6&&L  
  strAboutMenu.LoadString(IDS_ABOUTBOX); `eeA,K_  
  if (!strAboutMenu.IsEmpty()) Z9eP(ip  
  { 9I(00t_  
   pSysMenu->AppendMenu(MF_SEPARATOR); Y]DC; ,  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?_eHvw  
  } kW=!RX[&  
 } KbMan~Pb6  
 SetIcon(m_hIcon, TRUE); // Set big icon :QC |N@C  
 SetIcon(m_hIcon, FALSE); // Set small icon 8vQR'<,  
 m_Key.SetCurSel(0); a\&g;n8jA  
 RegisterHotkey(); w-3Lw<  
 CMenu* pMenu=GetSystemMenu(FALSE); &Tg~A9y\  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ZS[Ut  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); D"exI]  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^U##9KkP  
 return TRUE; // return TRUE unless you set the focus to a control LCW}1H:Q  
} /0Mt-8[  
dSe d 6  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Mbn;~tY>  
{ -q\Rbb5M  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g.\%jDM  
 { ij1YV2v  
  CAboutDlg dlgAbout; ]n3!%0]\  
  dlgAbout.DoModal(); 28vQ  
 } k U0.:Gcc  
 else 45&Rl,2  
 { {C0Y8:"`  
  CDialog::OnSysCommand(nID, lParam); [&kz4_  
 } d4p6.3  
} v-wZHkdd1  
GJ F &id  
void CCaptureDlg::OnPaint() 6"; ITU^v  
{ mF4y0r0  
 if (IsIconic()) .A0fI";Q  
 { $9@AwS@Uu  
  CPaintDC dc(this); // device context for painting :(@P *"j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |a %Wd  
  // Center icon in client rectangle hzT)5'_  
  int cxIcon = GetSystemMetrics(SM_CXICON); F|@\IVEB]  
  int cyIcon = GetSystemMetrics(SM_CYICON); Wg20H23XW  
  CRect rect; '.C#"nY>1  
  GetClientRect(&rect); U uC-R)  
  int x = (rect.Width() - cxIcon + 1) / 2; VfUHqdg-  
  int y = (rect.Height() - cyIcon + 1) / 2; $ Ggnn#  
  // Draw the icon 3W{ !\  
  dc.DrawIcon(x, y, m_hIcon); 9E NI%Jz  
 } {h PB%  
 else UZ#oaD8H6  
 { Vf<q-3q  
  CDialog::OnPaint(); ;e< TEs  
 } %NM={X|'  
} ci/qm\JI<<  
D$@2H>.-  
HCURSOR CCaptureDlg::OnQueryDragIcon() D c;k)z=  
{ .(3ec/i4CF  
 return (HCURSOR) m_hIcon; 4c[/%e:\-  
} Y6Ux*vhK  
(4Nj3x o  
void CCaptureDlg::OnCancel() {e q378d  
{ 9M5W4&  
 if(bTray) R_\o`v5  
  DeleteIcon(); H \'1.8g/  
  CDialog::OnCancel(); ZCV i ZWo  
} 64]8ykRD-  
1 b 86@f   
void CCaptureDlg::OnAbout() ~Z!YB,)bp  
{ _,IjB/PR(  
 CAboutDlg dlg; 1vxQ`)a  
 dlg.DoModal(); '.M4yif \g  
} bE{Y K  
T]nAz<l),  
void CCaptureDlg::OnBrowse() >239SyC-,  
{ boHbiE  
 CString str; fx>U2  
 BROWSEINFO bi; )WInPW  
 char name[MAX_PATH]; o8|qT)O@U  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); v$w}UC%uf  
 bi.hwndOwner=GetSafeHwnd(); ]:b52Z  
 bi.pszDisplayName=name; {f@Q&(g  
 bi.lpszTitle="Select folder"; \KzJNCOT  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; +I3O/=)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); maN2(1hz  
 if(idl==NULL) szb@2fK  
  return; U|VL+9#hd  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); JgA{1@h  
 str.ReleaseBuffer(); R PoBF~>  
 m_Path=str; j>B*8*Ss  
 if(str.GetAt(str.GetLength()-1)!='\\') 0{vH.b @  
  m_Path+="\\"; AI Kz]J0;  
 UpdateData(FALSE); |xg_z&dX  
} =5Nh}o(l?  
O ;[Mi  
void CCaptureDlg::SaveBmp() z;F HZb9t,  
{ O"Nr$bS(Y  
 CDC dc; RRV%g!  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); k!}(a0h  
 CBitmap bm; M=lU`Sm  
 int Width=GetSystemMetrics(SM_CXSCREEN); ZWo~!Z[Y  
 int Height=GetSystemMetrics(SM_CYSCREEN); MkL2I+*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); #o7)eKeQ  
 CDC tdc; 6@t&  
 tdc.CreateCompatibleDC(&dc); d9BFeq8  
 CBitmap*pOld=tdc.SelectObject(&bm); o-7{\%+M  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); yNow hh  
 tdc.SelectObject(pOld); Z"%.  
 BITMAP btm; euVDrJ^  
 bm.GetBitmap(&btm); 2[HPU M2>  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; GK!@|Kk8q7  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); T^(W _S  
 BITMAPINFOHEADER bih; J"LLj*,0"  
 bih.biBitCount=btm.bmBitsPixel; Sk/@w[  
 bih.biClrImportant=0; ) $b F*  
 bih.biClrUsed=0; BV:Ca34&  
 bih.biCompression=0; y<6c*e1  
 bih.biHeight=btm.bmHeight; cv-rEHT  
 bih.biPlanes=1; Nw$OJ9$L>  
 bih.biSize=sizeof(BITMAPINFOHEADER); IGQBTdPUa  
 bih.biSizeImage=size; At?|[%< `  
 bih.biWidth=btm.bmWidth; Q?1J<(oq9  
 bih.biXPelsPerMeter=0; {59 >U~  
 bih.biYPelsPerMeter=0; 4=/jh:h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); XsQ81j.  
 static int filecount=0;  1n +Uv*  
 CString name; m*A b<$y  
 name.Format("pict%04d.bmp",filecount++); HY FMf3  
 name=m_Path+name; e15yDwvB  
 BITMAPFILEHEADER bfh; z<%bNnSO  
 bfh.bfReserved1=bfh.bfReserved2=0; c:u*-lYmK%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); eZqEFMBTm  
 bfh.bfSize=54+size; ZY]$MZf5yo  
 bfh.bfOffBits=54; ^4+NPk  
 CFile bf; kN Ll|in@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6QCV i  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); W"\}##  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6j XDLI  
  bf.WriteHuge(lpData,size); 'z AvQm  
  bf.Close(); #Iv KI+"  
  nCount++; GdI,&| /  
 } ye9GBAj /  
 GlobalFreePtr(lpData); 2[ofz}k]r)  
 if(nCount==1) gBv!E9~l  
  m_Number.Format("%d picture captured.",nCount); [,,@>nyD  
 else $"W[e"Q  
  m_Number.Format("%d pictures captured.",nCount); {$hWz(  
  UpdateData(FALSE); nPdkvs   
} i.uyfV&F  
-d A9x~o  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) R/Bjc}J'  
{ $cHU,  
 if(pMsg -> message == WM_KEYDOWN) kY\faWuR  
 { Nh}-6|M  
  if(pMsg -> wParam == VK_ESCAPE) ))f@9m  
   return TRUE; g:ky;-G8b  
  if(pMsg -> wParam == VK_RETURN) -0kMh.JYR  
   return TRUE; $<nRW*d  
 } %W\NYSm  
 return CDialog::PreTranslateMessage(pMsg); hmo4H3g!N  
} S',h*e  
cB){b'WJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) tjwf;g}$  
{ py:L-5  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ cM'MgX9  
  SaveBmp(); 3 0[Xkz  
  return FALSE; oSD=3DQ;  
} Lw,}wM5X  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ {l,&F+W$C  
 CMenu pop; LYECX  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); v#&;z_I+  
 CMenu*pMenu=pop.GetSubMenu(0);  Y4 z  
 pMenu->SetDefaultItem(ID_EXITICON); j0}wv~\  
 CPoint pt; qsW&kW~  
 GetCursorPos(&pt);  ~d eS*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); syW[uXNLZ  
 if(id==ID_EXITICON) x5uz$g  
  DeleteIcon(); X^N6s"2  
 else if(id==ID_EXIT) J FnE{  
  OnCancel(); ocWl]h].  
 return FALSE; @2hhBW  
} >IrQhSF  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7;q0'_G  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) eLPtdP5k  
 AddIcon(); IC'+{3.m8  
 return res; F t11?D B  
} S/)),~`4  
9;v3 (U+:  
void CCaptureDlg::AddIcon() <Hr<QiAK  
{ Mb2a;s  
 NOTIFYICONDATA data; I F6$@Q  
 data.cbSize=sizeof(NOTIFYICONDATA); 8|)!E`TKSV  
 CString tip; g $Y]{VM.J  
 tip.LoadString(IDS_ICONTIP); %C,zR&]F  
 data.hIcon=GetIcon(0); J{dO0!7y  
 data.hWnd=GetSafeHwnd(); Yc]k<tQ  
 strcpy(data.szTip,tip); JseKqJ?g  
 data.uCallbackMessage=IDM_SHELL; Yq00<kIDJ  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; S1^/W-yoc~  
 data.uID=98; r+ 8Tp|%  
 Shell_NotifyIcon(NIM_ADD,&data); Db|JR  
 ShowWindow(SW_HIDE); WUie `p  
 bTray=TRUE; DCiU?u~  
} Zqm%qm:  
X5/j8=G H`  
void CCaptureDlg::DeleteIcon() 'uL$j=vB  
{ yg'CL/P  
 NOTIFYICONDATA data; W`9{RZ'  
 data.cbSize=sizeof(NOTIFYICONDATA); vw!7f|Pg ~  
 data.hWnd=GetSafeHwnd(); "KK}} $>  
 data.uID=98; ,H"}Rw  
 Shell_NotifyIcon(NIM_DELETE,&data); 1q!k#Cliu  
 ShowWindow(SW_SHOW); 1$03:ve1  
 SetForegroundWindow(); J' P:SC1  
 ShowWindow(SW_SHOWNORMAL); k 6[   
 bTray=FALSE; eK1l~W%  
} d^RcJ3w  
HN NeH;L  
void CCaptureDlg::OnChange() ? bWc<]  
{ k8}fKVU;  
 RegisterHotkey(); ASoBa&vX  
} p1niS:}j  
W?zj^y[w  
BOOL CCaptureDlg::RegisterHotkey() j:1N&7<FU  
{ 02;'"EmP$  
 UpdateData(); YX,;z/Jw2  
 UCHAR mask=0; seK;TQ3/7  
 UCHAR key=0; VdM Ksx`r  
 if(m_bControl) @4*eH\3  
  mask|=4; vzI>:Bf  
 if(m_bAlt) i=n;rT  
  mask|=2; Ne|CWUhO  
 if(m_bShift) $!9U\Au>2  
  mask|=1; A}9^,C$#  
  key=Key_Table[m_Key.GetCurSel()]; 3l~7  
 if(bRegistered){ 1YMi4.  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =p[Sd*d  
  bRegistered=FALSE; %IVM1  
 } Xk%eU>d  
 cMask=mask; vo }4N[]Sb  
 cKey=key; Kn$E{F\  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); <`SA >P  
 return bRegistered; 83V\O_7j  
} #pAN   
81|[Y'f  
  四、小结 &&<l}E  
Szu @{lpP@  
  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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