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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: [BV{=;iD  
  Hh!x&;x}  
  一、实现方法 ;utjW1y  
aUA+%  
  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: dd4yS}yBlR  
,sLV6DM  
#pragma data_seg("shareddata") qVM]$V#e  
HHOOK hHook =NULL; //钩子句柄 $<33E e:a  
UINT nHookCount =0; //挂接的程序数目 g]d"d  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 +U6! bu>C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 TD3R/NP  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _bMs~%?~/  
static int KeyCount =0; 'Y"q=@Ei9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 vkR"A\:  
#pragma data_seg() i!,>3  
![Jxh,f  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 *2@ q=R-1  
<,cDEN7  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 8@$QN4^u^  
$rjv4e}7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cIgFSwQ 4  
cKey,UCHAR cMask) jJ?3z ,h  
{ J-,T^Wv  
 BOOL bAdded=FALSE; bq ~'jg^#  
 for(int index=0;index<MAX_KEY;index++){ 45-pJf8F  
  if(hCallWnd[index]==0){ /-4%ug tD$  
   hCallWnd[index]=hWnd; a<\m` Es=  
   HotKey[index]=cKey; DTr0u}m  
   HotKeyMask[index]=cMask; i,bFe&7J  
   bAdded=TRUE; 9CL&tpqv f  
   KeyCount++; ?NHh=H\7u  
   break; '-v~HwC+/T  
  } #4" \\  
 } oEi +S)_  
 return bAdded; m X2Qf8  
} Y@.:U*  
//删除热键 C(gH}N4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U\b,W&%P  
{ vO&1F@  
 BOOL bRemoved=FALSE; /Hd\VI  
 for(int index=0;index<MAX_KEY;index++){ O~xc> w  
  if(hCallWnd[index]==hWnd){ cxmr|- ^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4`*jF'N[  
    hCallWnd[index]=NULL; lv8tS-  
    HotKey[index]=0; ;#j/F]xG  
    HotKeyMask[index]=0; Y}Qu-fm  
    bRemoved=TRUE; }S42.f.p  
    KeyCount--; 7v\OS-  
    break; khEHMvVH  
   } *?i~AXJm  
  } n ~ =]/  
 } n$~RgCf  
 return bRemoved; _|s{G  
} 2KPXRK  
8ztY_"]3p  
#U6Wv1H{Lp  
  DLL中的钩子函数如下: ;>Kxl}+R  
*.~M#M 9c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :z^c<KFX  
{ $T*kpUXH}  
 BOOL bProcessed=FALSE; Y#rao:I  
 if(HC_ACTION==nCode) l[h??C`  
 { naAZR*(A  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 2j_L jY'7  
   switch(wParam) {cG&l:-r  
   {  5qFqH  
    case VK_MENU: >+G=|2  
     MaskBits&=~ALTBIT; Z?^AX&F  
     break; `@Qq<T}V  
    case VK_CONTROL: p-Q1abl  
     MaskBits&=~CTRLBIT; ^LnCxA&QH  
     break;  /h   
    case VK_SHIFT: #%E~I A%  
     MaskBits&=~SHIFTBIT; ~>qcV=F^d,  
     break; =MoPOib\n  
    default: //judge the key and send message t/y0gr tm6  
     break; WMYvE\"  
   } M'[J0*ip  
   for(int index=0;index<MAX_KEY;index++){ CaK 0o*D  
    if(hCallWnd[index]==NULL) h],_1!0  
     continue; X}S<MA`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6rR}qV,+{  
    { -1U]@s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  okfhd{9  
     bProcessed=TRUE; gI T"nG=a4  
    } 7@06x+!  
   } Aw >DZ2  
  } 'Z;R!@Dm  
  else if((lParam&0xc000ffff)==1){ //有键按下 7<X_\,I  
   switch(wParam) kkh#VGh"  
   { * 78TT \q<  
    case VK_MENU: .PF~8@1ju  
     MaskBits|=ALTBIT; m:K/ )v*  
     break; A2htD!3  
    case VK_CONTROL:  /pV^w  
     MaskBits|=CTRLBIT; ;[%AeN5W  
     break; C~kw{g+|  
    case VK_SHIFT: 6R"& !.ZF  
     MaskBits|=SHIFTBIT; E Xo"F*gW  
     break; \GBv@  
    default: //judge the key and send message G;`+MgJ)  
     break; |nv8&L8  
   } 5J1,Usm  
   for(int index=0;index<MAX_KEY;index++){ ](3=7!!J  
    if(hCallWnd[index]==NULL) -u8 ma%JW  
     continue; 6$`8y,TMSt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^Z;5e@S  
    { a^|mF# z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 0urQA_JC  
     bProcessed=TRUE; fF<~2MiKw  
    } , @(lYeD"  
   } z!?xz  
  } $1/yc#w u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ql^n=+U  
   for(int index=0;index<MAX_KEY;index++){ h\:"k_u#  
    if(hCallWnd[index]==NULL) 7!z0)Ai_>=  
     continue; qJrK?:O;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 'BtvT[KM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j#.Aiy:,  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 _18) XR  
   } dd_n|x1  
  } Fb.wm   
 } UG 9uNgzQ/  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); k${25*M!3  
} )g+~"&Gcx  
1@;Dn'  
  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: Un@dWf6'  
A"d=,?yE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yP6^& 'I+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7'CdDB6&.  
THkg,*;:  
  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: }-!0d*I  
qgDd^0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j%Usui<DL  
{ HZ )z^K?1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) f6u<.b  
 { p~BEz?e  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 AwUcU;"9>  
  SaveBmp(); h 5<46!P  
  return FALSE; RMDzPda.  
 } Wi)Y9frE  
 …… //其它处理及默认处理 q\/ph(HF  
} F7x]BeTM  
SwXVa/9a"  
<D%.'=%pZ  
  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。 PsaKzAg?  
5$d>:" >  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 :tdN#m6&  
#8i DM5:EQ  
  二、编程步骤 )pbsvR_  
nD{o8;  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; jH({Qc,97  
fX2sjfk  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; X0.kQ  
F}wy7s2i  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Z8%?ej`8  
wQEsq<  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; d)1 d0ES  
SFv'qDA  
  5、 添加代码,编译运行程序。 g1Ed:V]_  
-U.>K,M  
三、程序代码 o#fr5>h-w  
TkBHlTa"=  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL J;|a)Nw  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %68'+qz  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ I() =Ufs5z  
#if _MSC_VER > 1000 lE'3UqK  
#pragma once ,)@njC?J  
#endif // _MSC_VER > 1000 9sG]Q[:.]  
#ifndef __AFXWIN_H__ xy))}c%  
#error include 'stdafx.h' before including this file for PCH >J*x` a3Q  
#endif ct`j7[  
#include "resource.h" // main symbols rP|~d}+I  
class CHookApp : public CWinApp #9zpJ\E  
{ y)vK=,"  
 public: Ql"kJ_F!br  
  CHookApp(); )0+6^[Tqq  
  // Overrides 0Q?)?8_  
  // ClassWizard generated virtual function overrides FkE)~g  
  //{{AFX_VIRTUAL(CHookApp) p>_Qns7W  
 public: & 6'Rc#\P  
  virtual BOOL InitInstance(); sPX&XqWx  
  virtual int ExitInstance(); ,.9k)\/V  
  //}}AFX_VIRTUAL B X\/Am11  
  //{{AFX_MSG(CHookApp) R!f<6l8#W  
  // NOTE - the ClassWizard will add and remove member functions here. t xE=AOY5  
  // DO NOT EDIT what you see in these blocks of generated code ! aKjP{Z0k$  
  //}}AFX_MSG 5(>SFxz"t  
  DECLARE_MESSAGE_MAP() ,2YZB*6h{  
}; ~=va<%{ U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ysapvQN_6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VWq]w5oQO  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ' _d4[Olu  
BOOL InitHotkey(); o1`\*]A7J  
BOOL UnInit(); I+=+ ,iXhB  
#endif b:Z&;A|"{  
A:y HClmn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. y+3+iT@i  
#include "stdafx.h" E75/EQ5p]p  
#include "hook.h" 3ew4QPT'  
#include <windowsx.h> [?%q,>F  
#ifdef _DEBUG >)F "lR:o  
#define new DEBUG_NEW is }>+&_  
#undef THIS_FILE ]Hp>~Zvbb  
static char THIS_FILE[] = __FILE__; XeX\u3<D  
#endif DA1?M'N  
#define MAX_KEY 100 B*Q9g r  
#define CTRLBIT 0x04 e:%|.$4OG  
#define ALTBIT 0x02 Z1#u&oX  
#define SHIFTBIT 0x01 2ah%,o  
#pragma data_seg("shareddata") <d @9[]  
HHOOK hHook =NULL; >-w(P/  
UINT nHookCount =0; $=iw<B r  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Ve2{;`t  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT jp_|pC'  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey =Ox}WrU~  
static int KeyCount =0; #x;,RPw5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  />Q}0H g  
#pragma data_seg() aaP_^m O  
HINSTANCE hins; NV7k@7_{B  
void VerifyWindow(); !_vxbfZO  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) s1q8r!2\w  
//{{AFX_MSG_MAP(CHookApp) (:aU"5M  
// NOTE - the ClassWizard will add and remove mapping macros here. dgL>7X=7  
// DO NOT EDIT what you see in these blocks of generated code!  D|)a7_  
//}}AFX_MSG_MAP OvAhp&k  
END_MESSAGE_MAP() +$|fUn{  
@/F61Ut  
CHookApp::CHookApp() K>dB{w#gS  
{ om`T/@_,  
 // TODO: add construction code here, N0H=;CIQ  
 // Place all significant initialization in InitInstance V"m S$MN  
} ^|H={pd'c0  
#l ZK_N|1x  
CHookApp theApp; w9{C"K?u=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fqhL"Ah   
{ P 0e-v0  
 BOOL bProcessed=FALSE; R*:>h8  
 if(HC_ACTION==nCode) [% C,&h5  
 { RN[I%^$"  
  if((lParam&0xc0000000)==0xc0000000){// Key up SRwD`FF  
   switch(wParam) |~r-VV(=  
   { @^A5{qQ\  
    case VK_MENU: # obRr#8  
     MaskBits&=~ALTBIT; '`3#FCg  
     break; @@)2 12  
    case VK_CONTROL: 1>"-!ADm  
     MaskBits&=~CTRLBIT; !bP%\)5  
     break; "!~o  
    case VK_SHIFT: &E_a0*)e  
     MaskBits&=~SHIFTBIT; 0^lWy+  
     break; CmZayV  
    default: //judge the key and send message h:nybLw?  
     break; fC[za,PXaE  
   } t N{S;)q#X  
   for(int index=0;index<MAX_KEY;index++){ Gq^vto  
    if(hCallWnd[index]==NULL) N ~{N Nf Y  
     continue; H_X^)\oJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B1V{3  
    { ovdJ[bO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hbJ>GSoZ,  
     bProcessed=TRUE; z5kAf~A  
    } }5-w,m{8/  
   } nN\H'{Wzd  
  } {%f{U"m  
  else if((lParam&0xc000ffff)==1){ //Key down KNUK]i&L  
   switch(wParam) m[^lu1\wn  
   { qOwql(vX  
    case VK_MENU: <eoie6@3  
     MaskBits|=ALTBIT; |^6{3a  
     break; EU$.{C_O(  
    case VK_CONTROL: ^U }k   
     MaskBits|=CTRLBIT; t:2v`uk  
     break; K]hp-QK<  
    case VK_SHIFT: lH}KFFbp  
     MaskBits|=SHIFTBIT; $KK~KEZ2  
     break; 2;8m0+tl  
    default: //judge the key and send message `gX@b^  
     break; 1^!SuAA@  
   } >Icr4?zq  
   for(int index=0;index<MAX_KEY;index++) ;V xRaj?  
   { BmG(+;;&  
    if(hCallWnd[index]==NULL) QO2cTk m  
     continue; vrkY7L3\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /ad9Q~nJ  
    { rO'DT{Yt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x4oWZEd  
     bProcessed=TRUE; =]Vz= <  
    } cCe~Ol XQ  
   } {KG6#/%;  
  } <kak9 6A  
  if(!bProcessed){ c.ow4~>  
   for(int index=0;index<MAX_KEY;index++){ i[o 2(d,  
    if(hCallWnd[index]==NULL) s6!6Oqh  
     continue; ,#K/+T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n0xGIq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Oynb "T&8  
   } EY,jy]|#  
  } ^[M{s(b  
 } gc9R;B1  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E>!=~ 7.  
} bMyld&ga  
F5h/>  
BOOL InitHotkey() FSIiw#xzH  
{ CKYg!\g(:  
 if(hHook!=NULL){ +0'F@l  
  nHookCount++; fw%`[( hK  
  return TRUE; !%iHJwS#  
 } E TT46%Y  
 else Ld4U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); UB/> Ro  
  if(hHook!=NULL) M+)a6ge  
   nHookCount++; 1( pHC  
  return (hHook!=NULL); Wg']a/m  
} lW+mH=  
BOOL UnInit() -(qRC0V  
{ NRi5 Vp2=  
 if(nHookCount>1){ c-a,__c?hx  
  nHookCount--; a=iupXre9  
  return TRUE; eb62(:=N6  
 } ?=VvFfv%  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ~}Xus?e  
 if(unhooked==TRUE){ A,}M ^$@  
  nHookCount=0; o ).deP s-  
  hHook=NULL; J|`0GDSn  
 } #b/qR^2qW  
 return unhooked; v}G^+-?  
} g'8Y5x[  
j~CnMKN  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (|gQ i{8  
{ {]0e=#hw  
 BOOL bAdded=FALSE; $></%S2g  
 for(int index=0;index<MAX_KEY;index++){ ?'a8QJo  
  if(hCallWnd[index]==0){ JMb_00r  
   hCallWnd[index]=hWnd; dftBD  
   HotKey[index]=cKey; s]arNaaA  
   HotKeyMask[index]=cMask; bSB%hFp=Cp  
   bAdded=TRUE; SmRlZ!%e  
   KeyCount++; XYEwn_Y  
   break; IG781:,/  
  } !wAT`0<94F  
 } ,X4e?$7g  
 return bAdded; d2rs+-  
} asT-=p_ 0.  
oQ!M+sRmF  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :E:e ^$p  
{ mk-{@$QJb  
 BOOL bRemoved=FALSE; zWHq4@K  
 for(int index=0;index<MAX_KEY;index++){ (]|h6aI'}  
  if(hCallWnd[index]==hWnd){ x9_mlZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bc)>h!'Y  
    hCallWnd[index]=NULL; C|'DKT4M&  
    HotKey[index]=0; ([>ecS@eO  
    HotKeyMask[index]=0; hXW` n*Zw  
    bRemoved=TRUE; /%wS5IZ^  
    KeyCount--; ARk(\,h  
    break; ']_2@<XW)  
   } rQ;w{8J\t  
  } 5)[~ T2j!  
 } f6Qr0Op  
 return bRemoved; i "8mrWb  
} [>=!$>>;8  
rP@#_(22  
void VerifyWindow() p>6`jr  
{ 6Rc=!_v^  
 for(int i=0;i<MAX_KEY;i++){ )vp0X\3q`  
  if(hCallWnd!=NULL){ / f%mYL  
   if(!IsWindow(hCallWnd)){ d2k-MZuT6  
    hCallWnd=NULL; K/Q"Z*  
    HotKey=0; _( W@FS  
    HotKeyMask=0; dG\ wW@}J  
    KeyCount--; YeH!v, >  
   } 7_0 p& 3  
  } y<)TYr  
 } vOQ% f?%G\  
} @Nu2 :~JO  
91-bz^=xO  
BOOL CHookApp::InitInstance() Up9{aX  
{ Bo 35L:r|  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); L@}PW)#  
 hins=AfxGetInstanceHandle(); 7)66e  
 InitHotkey(); zWsr|= [  
 return CWinApp::InitInstance(); i\R0+ O{  
} OM*_%UF  
ua\t5M5  
int CHookApp::ExitInstance() kaG/8G(  
{ BZR{}Aj4pa  
 VerifyWindow(); FDHW' OP4  
 UnInit(); ^t >mdxuq  
 return CWinApp::ExitInstance(); ;KeU f(tH  
} ]hl*6  
12$0-@U  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >)><u4}  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _)A|JC!jId  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8tY>%A~^z  
#if _MSC_VER > 1000 U& ?hG>  
#pragma once SI(f&T(  
#endif // _MSC_VER > 1000 | ,8z" g  
|s8N  
class CCaptureDlg : public CDialog M`MxdwR  
{ 6j#JhcS+  
 // Construction d2\ !tJm  
 public: Ni$'# W?t  
  BOOL bTray; Epzg|L1)  
  BOOL bRegistered; f?3-C8 hU  
  BOOL RegisterHotkey(); TlG>)Z@/  
  UCHAR cKey; N&9o  1_}  
  UCHAR cMask; T j$'B[cv  
  void DeleteIcon(); !avol/*  
  void AddIcon(); +WX/4_STV  
  UINT nCount; bO~y=Pa \  
  void SaveBmp(); mHD_cgKN  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor WT *"V<Z  
  // Dialog Data R@e'=z[%1  
  //{{AFX_DATA(CCaptureDlg) 8K%N7RL|  
  enum { IDD = IDD_CAPTURE_DIALOG }; G0FzXtu)q  
  CComboBox m_Key; %mI0*YRma  
  BOOL m_bControl; 2YD\KXDo  
  BOOL m_bAlt; i FI74COam  
  BOOL m_bShift; #]#9Xq  
  CString m_Path; x*7@b8J  
  CString m_Number; Q>niJ'7WF  
  //}}AFX_DATA i'tMpS3  
  // ClassWizard generated virtual function overrides !MbzFs~  
  //{{AFX_VIRTUAL(CCaptureDlg) [%W'd9`>  
 public: 86&M Zdv6  
  virtual BOOL PreTranslateMessage(MSG* pMsg); KK|w30\f  
 protected: 1wSAwpz  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NvK9L.K  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); EF/d7  
  //}}AFX_VIRTUAL hlVye&;b8  
  // Implementation st'T._  
 protected: U(&c@u%  
  HICON m_hIcon; 05UN <l]  
  // Generated message map functions F^!D[:;jK  
  //{{AFX_MSG(CCaptureDlg) 3m1g"  
  virtual BOOL OnInitDialog(); JWVV?~1  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); JK,MK|  
  afx_msg void OnPaint(); #w$Y1bjn  
  afx_msg HCURSOR OnQueryDragIcon(); {Jr1K,  
  virtual void OnCancel(); `Rq=:6U;3  
  afx_msg void OnAbout(); 8|&,JdT  
  afx_msg void OnBrowse(); -4Qub{Uym  
  afx_msg void OnChange(); -V$|t<  
 //}}AFX_MSG jNZ .Fb  
 DECLARE_MESSAGE_MAP() ) u?f| D  
}; 4pmeu:26  
#endif =lacfPS  
U,GSWMI/K  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file VRo&1:  
#include "stdafx.h" \;;M")$  
#include "Capture.h" T,38Pu@r  
#include "CaptureDlg.h" -t-f&`S||  
#include <windowsx.h> HU0.)tD  
#pragma comment(lib,"hook.lib") !$I~3_c  
#ifdef _DEBUG kc'$4 J4Tw  
#define new DEBUG_NEW ! j~wAdHk  
#undef THIS_FILE DP_b9o \5  
static char THIS_FILE[] = __FILE__; Iix,}kzss  
#endif r&=ulg  
#define IDM_SHELL WM_USER+1 ,BdObx  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jkeerU6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X$};K \I  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; pn"!wqg  
class CAboutDlg : public CDialog d_[H|H9i6  
{ 1(' wg!  
 public: %-hSa~20  
  CAboutDlg(); uWS]l[Ga  
  // Dialog Data )Q2Ap&  
  //{{AFX_DATA(CAboutDlg) [@$ SLl^Y  
  enum { IDD = IDD_ABOUTBOX }; ]:%DDlRb  
  //}}AFX_DATA ?G{0{ c2  
  // ClassWizard generated virtual function overrides >t+ ENYb  
  //{{AFX_VIRTUAL(CAboutDlg) 2m Y!gVi  
 protected: <^S\&v1C_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Bc>j5^)8w  
  //}}AFX_VIRTUAL :UwBs  
  // Implementation KQ~y;{h?b  
 protected: oZ{,IZ45  
  //{{AFX_MSG(CAboutDlg) HG"ZN)~  
  //}}AFX_MSG RhYe=Qh4{p  
  DECLARE_MESSAGE_MAP() ~DH 9iB  
}; J,$xQ?,wE  
:s)cTq|3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) If'q8G3]-  
{ 1 UQ,V`y  
 //{{AFX_DATA_INIT(CAboutDlg) xU'z>y4V$  
 //}}AFX_DATA_INIT 2H%9l@}u  
} ` w;Wud'*<  
14$%v;Su4  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) \p^V~fy7rU  
{ G1|1Z5r  
 CDialog::DoDataExchange(pDX); i0M6;W1T  
 //{{AFX_DATA_MAP(CAboutDlg) B>{%$@4  
 //}}AFX_DATA_MAP n%Oi~7>  
} ^^q&VL  
 %:26v  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (Cr  
 //{{AFX_MSG_MAP(CAboutDlg) {lK2yi  
 // No message handlers <ZT C^=3  
 //}}AFX_MSG_MAP eP~bl   
END_MESSAGE_MAP() 4Kqo>|C  
 9q X$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Y S3~sA  
: CDialog(CCaptureDlg::IDD, pParent) WZa6*pF  
{ -TD\?Q  
 //{{AFX_DATA_INIT(CCaptureDlg) ]*dYX=6  
  m_bControl = FALSE; s|IBX0^@  
  m_bAlt = FALSE; OvH:3 "Sdy  
  m_bShift = FALSE; EBhdP  
  m_Path = _T("c:\\"); # epP~J_f  
  m_Number = _T("0 picture captured."); 9J:|"@)N  
  nCount=0; l|q-kRRjn  
  bRegistered=FALSE; 9nY`rF8@  
  bTray=FALSE; {S0-y  
 //}}AFX_DATA_INIT .2I?^w&j+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &C'^YF_^0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); $f@YQN=  
} ?N4FB*x  
.!q_jl%U  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) coCT]<  
{ Kp7D I0~  
 CDialog::DoDataExchange(pDX); Kebr>t8^  
 //{{AFX_DATA_MAP(CCaptureDlg) hpf0fU  
  DDX_Control(pDX, IDC_KEY, m_Key); ,#;hI{E  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); MkW=sD_  
  DDX_Check(pDX, IDC_ALT, m_bAlt); V7,dx@J-  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); <F^9ML+'  
  DDX_Text(pDX, IDC_PATH, m_Path); \Zf=A[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Byq VNz0L  
 //}}AFX_DATA_MAP QC'Ru'8S  
} =A!oLe$%  
/? %V% n  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) I`{3I-E  
//{{AFX_MSG_MAP(CCaptureDlg) xLed];2G  
 ON_WM_SYSCOMMAND() ~d7t\S  
 ON_WM_PAINT() b5MBzFw  
 ON_WM_QUERYDRAGICON() bo<P%$(D  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) HMVP71  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) yjT>bu]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) DN:| s+Lz  
//}}AFX_MSG_MAP ; gBR~W  
END_MESSAGE_MAP() &G2&OFAr]q  
)>2L(~W  
BOOL CCaptureDlg::OnInitDialog() 4?Y7. :x  
{ aEdA'>  
 CDialog::OnInitDialog(); f2~Aug  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <T>s;b  
 ASSERT(IDM_ABOUTBOX < 0xF000); MK3h~`is  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Y. J!]|  
 if (pSysMenu != NULL) \W=3P[gb  
 { NU=2*gM  
  CString strAboutMenu; rp\`uj*D  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 1v&!%9  
  if (!strAboutMenu.IsEmpty()) !4Aj#`)  
  { 7R:j^"I@  
   pSysMenu->AppendMenu(MF_SEPARATOR); ezw*Lo!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); LqYyIbsvf  
  } Tdh(J",d  
 } {|>'(iqH"w  
 SetIcon(m_hIcon, TRUE); // Set big icon + yI$4MY  
 SetIcon(m_hIcon, FALSE); // Set small icon ]Ea-MeH  
 m_Key.SetCurSel(0); JDf>Qg{  
 RegisterHotkey(); 7:B/ ?E  
 CMenu* pMenu=GetSystemMenu(FALSE); 3;buC|ky  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); A+^okT37r  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); {m!5IR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); e^lX|L>o  
 return TRUE; // return TRUE unless you set the focus to a control 'v^Vg  
} gcnX^[`S  
* WV=Xp  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .xqi7vVHZ  
{ nA0%M1a  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .@fA_8  
 { mrr]{K  
  CAboutDlg dlgAbout; ?98!2:'{9  
  dlgAbout.DoModal();  2d*bF.  
 } g8cBb5(L  
 else MWme3u)D  
 { %}(` ?  
  CDialog::OnSysCommand(nID, lParam); c\n_[r  
 } LxIGPC~  
} 3w)r""C&  
(s&:D`e  
void CCaptureDlg::OnPaint() I?Iz5e-  
{ ?L\"qz%gP  
 if (IsIconic()) 6=n|Ha  
 { 0g30nr)  
  CPaintDC dc(this); // device context for painting "dP-e  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ,c:NdY(,)  
  // Center icon in client rectangle zg3kU65PJE  
  int cxIcon = GetSystemMetrics(SM_CXICON); uD@ ZM  
  int cyIcon = GetSystemMetrics(SM_CYICON); FD[*Q2fU  
  CRect rect; O*v&C Hd3  
  GetClientRect(&rect); P@PF" {S  
  int x = (rect.Width() - cxIcon + 1) / 2; ^'[QCwY~  
  int y = (rect.Height() - cyIcon + 1) / 2; >3p~>;9sc  
  // Draw the icon E"9(CjbQ[  
  dc.DrawIcon(x, y, m_hIcon); \(Oc3+n6  
 } 7f+@6jqD\)  
 else mt+i0PIfj  
 { e_e\Ie/pDc  
  CDialog::OnPaint(); .;g kV-]  
 } {ol7*%u  
} Uj;JN}k  
="78#Wfj2  
HCURSOR CCaptureDlg::OnQueryDragIcon() MO$y st?fK  
{ }$z(?b  
 return (HCURSOR) m_hIcon; 2$Xof  
} |l8=z*v<  
(mp  
void CCaptureDlg::OnCancel() oc)`hg2=  
{ 1N(#4mE=  
 if(bTray) hYpxkco"4'  
  DeleteIcon(); QOEi.b8r  
  CDialog::OnCancel(); 8!|vp7/  
} C W#:'  
Hy4;i^Ik <  
void CCaptureDlg::OnAbout() +z nlf-  
{ F oC $X  
 CAboutDlg dlg; |;NfH|43;  
 dlg.DoModal(); mH\zSk  
} lv=q( &  
AuK$KGCI=  
void CCaptureDlg::OnBrowse() )1!<<;@0  
{ lS9S7`  
 CString str; @=l6zd@  
 BROWSEINFO bi; !.,J;Qt  
 char name[MAX_PATH]; "<+~uz  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); %IBT85{  
 bi.hwndOwner=GetSafeHwnd(); _U&HXQ8X  
 bi.pszDisplayName=name; UB5H8&Rf!  
 bi.lpszTitle="Select folder"; Q k}RcP  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Vm<_e  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 7(]F+\A3  
 if(idl==NULL) <&Xl b0  
  return; jUM'f24  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l,hOnpm9  
 str.ReleaseBuffer(); U2m#BMV  
 m_Path=str; <c[\\ :Hh*  
 if(str.GetAt(str.GetLength()-1)!='\\') N$kxf  
  m_Path+="\\"; F$\Da)Y  
 UpdateData(FALSE); Y f!Oo  
} ^P@:CBO  
LUD .  
void CCaptureDlg::SaveBmp() qr4 lr!#t  
{ _|["}M"?  
 CDC dc; ss%,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); pWKE`x^  
 CBitmap bm; ;ZUj2WxE  
 int Width=GetSystemMetrics(SM_CXSCREEN); }(8>&  
 int Height=GetSystemMetrics(SM_CYSCREEN); g>h/|b w4  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2|^@=.4\  
 CDC tdc; pDlrK&;\z  
 tdc.CreateCompatibleDC(&dc); BL 1KM2]  
 CBitmap*pOld=tdc.SelectObject(&bm); '>t&fzD0  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); iH4LZ  
 tdc.SelectObject(pOld); iV/I909*''  
 BITMAP btm; JD#q6 &|  
 bm.GetBitmap(&btm); JrOx nxd^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j yD3Sa3  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); z.8nYL5^}  
 BITMAPINFOHEADER bih; WGn=3(4  
 bih.biBitCount=btm.bmBitsPixel; $,@}%NlHc  
 bih.biClrImportant=0; g_cED15  
 bih.biClrUsed=0; x3&gB`j-  
 bih.biCompression=0; GGEM&0*  
 bih.biHeight=btm.bmHeight; Qwpni^D8j  
 bih.biPlanes=1; uQ-GJI^t  
 bih.biSize=sizeof(BITMAPINFOHEADER); =( |%%,3  
 bih.biSizeImage=size; }qso} WI  
 bih.biWidth=btm.bmWidth; ]Z5m_-I  
 bih.biXPelsPerMeter=0; R?iCJ5m  
 bih.biYPelsPerMeter=0; Qz(2Iu{E]  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); c+3`hVV  
 static int filecount=0; QO}~"lMj  
 CString name; l SdA7  
 name.Format("pict%04d.bmp",filecount++); ns>$  
 name=m_Path+name; A .&c>{B7  
 BITMAPFILEHEADER bfh; w@^J.7h^  
 bfh.bfReserved1=bfh.bfReserved2=0; *@''OyL  
 bfh.bfType=((WORD)('M'<< 8)|'B'); r\Y,*e  
 bfh.bfSize=54+size; =F$?`q`  
 bfh.bfOffBits=54; pgES)  
 CFile bf; O8 .xt|  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ .4\I?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Y M:9m)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 9k ~8n9  
  bf.WriteHuge(lpData,size); 'r7[9[  
  bf.Close(); 5(ZOm|3ix  
  nCount++; kVQm|frUz  
 } Ztmh z_u7  
 GlobalFreePtr(lpData); =!q]0#  
 if(nCount==1) F2}Fuupb.  
  m_Number.Format("%d picture captured.",nCount); yF(9=z"?  
 else A#cFO)"  
  m_Number.Format("%d pictures captured.",nCount); i'li;xUhZ  
  UpdateData(FALSE); B za<.E=  
} XiTi3vCe  
nrKAK^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1"Oe*@`pV  
{ e-y$&[  
 if(pMsg -> message == WM_KEYDOWN) ?YR;o4  
 { d.+  
  if(pMsg -> wParam == VK_ESCAPE) v_5qE  
   return TRUE; ru 6`Z+p  
  if(pMsg -> wParam == VK_RETURN) [<@T%yq  
   return TRUE; UxNn5(:sM@  
 } I>FL&E@K  
 return CDialog::PreTranslateMessage(pMsg); #ae?#?/"  
} N62;@Z\7  
]|g2V a~-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) n{!{,s  
{ 39 }e }W"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ,;}   
  SaveBmp(); ?h4[yp=w  
  return FALSE; LRHod1}mS  
} _MC',p&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Eh8GqFEM  
 CMenu pop; DQY1oM)D !  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); .zZfP+Q]8  
 CMenu*pMenu=pop.GetSubMenu(0); gGvL6Fu  
 pMenu->SetDefaultItem(ID_EXITICON); qY8; k #  
 CPoint pt; >KuNHuHu  
 GetCursorPos(&pt); n~6$CQ5dF(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u!D?^:u=)  
 if(id==ID_EXITICON) #6\m TL4vg  
  DeleteIcon(); 3g!Z[SZ  
 else if(id==ID_EXIT) 4A@HR  
  OnCancel(); Wd7*7']  
 return FALSE; 8J'5%$3u  
} =? !FO'zt"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (E0WZ $f}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )q_,V"  
 AddIcon(); dY}5Kmt  
 return res; V]--d33/a  
} \2 DED  
Ne+Rs+~4  
void CCaptureDlg::AddIcon() #d %v=.1  
{ OE(y$+L3_I  
 NOTIFYICONDATA data; D Z*c.|W  
 data.cbSize=sizeof(NOTIFYICONDATA); Vwp>:'Pu  
 CString tip; y/S3ZJY  
 tip.LoadString(IDS_ICONTIP); #9TL5-1y  
 data.hIcon=GetIcon(0); Se!w(Y&  
 data.hWnd=GetSafeHwnd(); J'WzEgCnU  
 strcpy(data.szTip,tip); }}k%.Qb  
 data.uCallbackMessage=IDM_SHELL; x~}&t+FK  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; x} =,'Ko}3  
 data.uID=98; wp}Q4I  
 Shell_NotifyIcon(NIM_ADD,&data); ys[xR=nbD  
 ShowWindow(SW_HIDE); ]mtiIu[  
 bTray=TRUE; ~s&r.6 DW  
} S Yi!%  
X$;x2mz nM  
void CCaptureDlg::DeleteIcon() ]Y]]X[@  
{ (enr{1  
 NOTIFYICONDATA data; bMc[0  
 data.cbSize=sizeof(NOTIFYICONDATA); Z#u{th  
 data.hWnd=GetSafeHwnd(); _"p(/H  
 data.uID=98; q(~jP0pj%  
 Shell_NotifyIcon(NIM_DELETE,&data); /F.<Gz;w  
 ShowWindow(SW_SHOW); &,{ >b[  
 SetForegroundWindow(); l\L71|3"g  
 ShowWindow(SW_SHOWNORMAL); [O\ )R[J  
 bTray=FALSE; >uZc#Zt  
} Hx+r9w  
?a,#p  
void CCaptureDlg::OnChange() 6P@K]jy& n  
{ cu1!WD  
 RegisterHotkey(); 8zMGpY#  
} rEp\ld  
C"n!mr{srt  
BOOL CCaptureDlg::RegisterHotkey() O\Y*s  
{ )kjQ W&)g  
 UpdateData(); bJPKe]spJ=  
 UCHAR mask=0; rYt|[Pk  
 UCHAR key=0; kO`!!M[Oo  
 if(m_bControl) x_O:IK.>  
  mask|=4; 92Gfxld\  
 if(m_bAlt) uy2~<)  
  mask|=2; -,*m\Fe}  
 if(m_bShift) a=ZVKb  
  mask|=1; H5d@TB, `  
  key=Key_Table[m_Key.GetCurSel()]; 56YqYu.  
 if(bRegistered){ ='.b/]!_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 0 J"g"=  
  bRegistered=FALSE; u `ww  
 } l$!ExXEZO;  
 cMask=mask; V"8Go;[  
 cKey=key; &&$*MHJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 3-{WFnA  
 return bRegistered; b&E"r*i|  
} KU "+i8"  
Il\{m?Y  
  四、小结 |a])o  
O=}  
  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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