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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: `bLJ wJ7  
  l Yj$ 3  
  一、实现方法 .+lx}#-#  
tTt}=hQpgX  
  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: c2Y\bKeN  
O[|X=ZwR:l  
#pragma data_seg("shareddata") HA&hu /mw_  
HHOOK hHook =NULL; //钩子句柄 s4=EyBI  
UINT nHookCount =0; //挂接的程序数目 ,,S 2>X*L  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 D_`~$QB`,  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 7o7FW=^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey RH$YM `cZ  
static int KeyCount =0; .8[uEQ_L  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 I-Hg6WtB  
#pragma data_seg() 7Fzr\&  
6J -=6t|  
  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。 \t=#MzjR  
(d.M} G  
  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: >Wd_?NaI  
G6\`Iy68/v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR S]&aDg1y}  
cKey,UCHAR cMask) lXVh`+X/l  
{ - Sn]`  
 BOOL bAdded=FALSE; `C^0YGO%  
 for(int index=0;index<MAX_KEY;index++){ PT4iy<  
  if(hCallWnd[index]==0){ h`p=~u +  
   hCallWnd[index]=hWnd; _0iV6Bj  
   HotKey[index]=cKey; <e@4;Z(h04  
   HotKeyMask[index]=cMask; xxC2 h3  
   bAdded=TRUE; p@@*F+  
   KeyCount++; . lSoC`HE  
   break; YYe=E,q  
  } e Zg>]<L  
 } |h.@Xy  
 return bAdded; g-/ }*m l  
} , $cpm=1  
//删除热键 N{a=CaYi+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :{KpnJvd  
{ $L'[_J  
 BOOL bRemoved=FALSE; F$YT4414  
 for(int index=0;index<MAX_KEY;index++){ O`9vEovjs  
  if(hCallWnd[index]==hWnd){ 1V,DcolRY  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Jgq#m~M6  
    hCallWnd[index]=NULL; 1T4#+kW&  
    HotKey[index]=0; hSj@<#b>F  
    HotKeyMask[index]=0; Zb<D%9  
    bRemoved=TRUE; J)H*tzg  
    KeyCount--; p$Floubh]  
    break; +'[/eW  
   } F84<='K  
  } tU.~7f#+A  
 } {]4Zpev  
 return bRemoved; OgzKX>N`A  
} gA]3h8%w  
*(Z\ "o!  
GgtYO4,  
  DLL中的钩子函数如下: Vf$$e)  
i G%R'/*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :=:m4UJb  
{ }:]CXrdg>  
 BOOL bProcessed=FALSE; EO/41O  
 if(HC_ACTION==nCode) }E&:  
 { Q-yNw0V}F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 =9:gW5F69  
   switch(wParam) Jpn= ^f[rm  
   {  8RcLs1n/  
    case VK_MENU: L=I;0Ip9y  
     MaskBits&=~ALTBIT; qv<^%7gq  
     break; (7"CYAe:;  
    case VK_CONTROL: Y3H5}4QD  
     MaskBits&=~CTRLBIT; Ns\};j?TU*  
     break; ofs'xs1C  
    case VK_SHIFT: \9R=fA18  
     MaskBits&=~SHIFTBIT; MG^YT%f  
     break;  ;B{oGy.  
    default: //judge the key and send message y#/P||PM  
     break; {r#uD5NJ/  
   } Q&w"!N  
   for(int index=0;index<MAX_KEY;index++){ ?kF? ~\c  
    if(hCallWnd[index]==NULL) ]\/"-Y#4Q  
     continue; 3sl6$NKo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \GZ|fmYn  
    {  $3cZS  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ^W~8)Rbf  
     bProcessed=TRUE; #[Rs&$vQm  
    } rrG}; A  
   } RW<4",  
  } m;ju@5X  
  else if((lParam&0xc000ffff)==1){ //有键按下 y-~_W 6\  
   switch(wParam) Bc'Mj=>;  
   { 5+q dn|9%T  
    case VK_MENU: TQQh:y  
     MaskBits|=ALTBIT; AN)r(86L  
     break; u>*qDr* d  
    case VK_CONTROL: mA^3?y j  
     MaskBits|=CTRLBIT; D/wJF[_  
     break; y=AF EP  
    case VK_SHIFT: ^E".`~R  
     MaskBits|=SHIFTBIT; *Xh#W7,<  
     break; lWUQkS  
    default: //judge the key and send message eWr6@  
     break; ~m[Gp;pL  
   } XR$i:kL,,  
   for(int index=0;index<MAX_KEY;index++){ B) dG:~  
    if(hCallWnd[index]==NULL) ; FHnu|  
     continue; 0#~k)>(7lR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h\+8eeIl  
    { @S6@pMo,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); `$vf9'\+  
     bProcessed=TRUE; #L&/o9|  
    } wZ=@0al  
   } 8T Tj<T!N  
  } \~  l"  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 PO ,zP9  
   for(int index=0;index<MAX_KEY;index++){ 35:RsL  
    if(hCallWnd[index]==NULL) zT93Sb  
     continue; d?V/V'T[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) f*VXg[&\\F  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); JkKbw&65  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8fK/0u^`d  
   } Qkc 9X0J!  
  } |\94a  
 } n3$u9!|P  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d ]jF0Wx*  
} 3EE_"}H>  
'-3K`[  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: uavyms^  
{`(MK6D8 c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); s|X_:3\x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :NB.ib@*  
J7t) H_S{  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: {Q @?CT  
x{/-&`F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hBhbcWD,ka  
{ ^oNcZK>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Fl}!3k>c  
 { ;j+*}|!  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !/X>k{  
  SaveBmp(); \S{ihS@J  
  return FALSE; hf;S#.k  
 } ({D>(xN   
 …… //其它处理及默认处理 <;cch6Z  
} ,$RXN8x1  
~yA^6[a=  
{aUv>T"c  
  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。 O9N+<sU=X  
nGur2}>n  
  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。 AoK;6je`K^  
12: Q`   
  二、编程步骤 PF+Or  
7p>T6jK)  
  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"; r> .l^U9hJ  
bfkFk  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; RJ{J~-q{  
F*-'8~T  
  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; GB,ub*|  
!(3[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; +>yspOEz  
fuWAw^&  
  5、 添加代码,编译运行程序。 vFeR)Ox's  
Pon0(:#1  
三、程序代码 V}Oz!  O  
KIKIag#  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL }G!'SZ$F 5  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) fJe5 i6`(  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ WcpH= "vm  
#if _MSC_VER > 1000 f"^t~q[VS  
#pragma once Y@qugQM>  
#endif // _MSC_VER > 1000 %4BQY>O)@  
#ifndef __AFXWIN_H__ w{]B)>! 1W  
#error include 'stdafx.h' before including this file for PCH @moaa}1  
#endif ch0cFF^]  
#include "resource.h" // main symbols f lt'~fe  
class CHookApp : public CWinApp 4ywtE}mp  
{ 4w]<1V  
 public: /AY q^  
  CHookApp(); i~*6JB|  
  // Overrides ,mz7!c9H^a  
  // ClassWizard generated virtual function overrides =5:kV/p  
  //{{AFX_VIRTUAL(CHookApp) ZVit] 3hd  
 public: ~{N#JOY}Z  
  virtual BOOL InitInstance(); h]IoH0/  
  virtual int ExitInstance(); P2U4,?_e  
  //}}AFX_VIRTUAL ?}EWfsA  
  //{{AFX_MSG(CHookApp) mxe\+j#  
  // NOTE - the ClassWizard will add and remove member functions here. A5[kYD,_  
  // DO NOT EDIT what you see in these blocks of generated code ! Y^|15ek  
  //}}AFX_MSG Yk*_u}?#  
  DECLARE_MESSAGE_MAP() G=C2l# Ae!  
}; )*7{%Ilq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 4`7~~:W!M5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $XKUw"%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "cbJ{ G1pk  
BOOL InitHotkey(); `iEYq0}  
BOOL UnInit(); 8v)HTD/C  
#endif >xH?`I7;f  
y5VohVa`  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :R3&R CTZ  
#include "stdafx.h" U@(8)[?nxn  
#include "hook.h" t{B6W)q  
#include <windowsx.h> F>E_d<m  
#ifdef _DEBUG brL u~]I  
#define new DEBUG_NEW =c]We:I  
#undef THIS_FILE gLx?0eBBA  
static char THIS_FILE[] = __FILE__; .mOm@<Xdg  
#endif Oo ^ AE  
#define MAX_KEY 100 qR , 5  
#define CTRLBIT 0x04 dkg+_V!  
#define ALTBIT 0x02 @9k3}x K  
#define SHIFTBIT 0x01 &]anRT#  
#pragma data_seg("shareddata") =w:H9uj6F  
HHOOK hHook =NULL; t*Z-]P  
UINT nHookCount =0; #kJ8 qN  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0t*PQ%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT '8I=Tn  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey !L_xcov!Y  
static int KeyCount =0; [G[{?{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift V=+p8nE0  
#pragma data_seg() :JXcs39  
HINSTANCE hins; +.$:ZzH#  
void VerifyWindow(); j9cB<atL  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g1B P  
//{{AFX_MSG_MAP(CHookApp) R80|q#h,]  
// NOTE - the ClassWizard will add and remove mapping macros here. QqXaXx;  
// DO NOT EDIT what you see in these blocks of generated code! PC%_^BDW  
//}}AFX_MSG_MAP <YWu/\{KT  
END_MESSAGE_MAP() ol_&epG;ST  
v v   
CHookApp::CHookApp() x26 sH5  
{ HhzPKd  
 // TODO: add construction code here, j",*&sy  
 // Place all significant initialization in InitInstance <&4~Z! O  
} 3[~LmA  
h[ C XH"  
CHookApp theApp; Aiqb*v$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) M2.*]AL  
{ =E~_F>SD  
 BOOL bProcessed=FALSE; *6v5JH&K  
 if(HC_ACTION==nCode) w}29#F\]R  
 { \`8F.oZ^)  
  if((lParam&0xc0000000)==0xc0000000){// Key up {4%ddJn[.)  
   switch(wParam) %,d+jBM  
   { U:$`M,762Z  
    case VK_MENU: ^Je*k)COn  
     MaskBits&=~ALTBIT; D9n+eZ  
     break; -{yG+1  
    case VK_CONTROL: T{BGg  
     MaskBits&=~CTRLBIT; A\ tBmL_s  
     break; I."s&]FZ  
    case VK_SHIFT: y cWY.HD  
     MaskBits&=~SHIFTBIT; u#->?  
     break; 0bGQO&s [  
    default: //judge the key and send message C{6m?6  
     break; 2J` LZS  
   } 2[KHmdgtB  
   for(int index=0;index<MAX_KEY;index++){ sr:hR Q27  
    if(hCallWnd[index]==NULL) \ow(4O#  
     continue; >waA\C}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _G)x\K]N  
    { -1R7 8(1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Wx8;+!2Q/  
     bProcessed=TRUE; BJsN~` =r  
    } Q|g>ga-a  
   } ^;Yjs.bI`F  
  } X0KUnxw  
  else if((lParam&0xc000ffff)==1){ //Key down ;!m_RQPFF  
   switch(wParam) GVdJ&d\x  
   { /EvT%h?p  
    case VK_MENU: 6p 14BruV  
     MaskBits|=ALTBIT; nYK!'x$  
     break; vE~<R  
    case VK_CONTROL: @_h=,g #@  
     MaskBits|=CTRLBIT; v/`#Gu^P  
     break; ^9|&w.:@Q  
    case VK_SHIFT: .GW)"`HbU  
     MaskBits|=SHIFTBIT; EhN@;D+  
     break; L_IvR 4:j~  
    default: //judge the key and send message =1mIk0H`  
     break; 3LVL5y7|  
   } 'qidorT>N  
   for(int index=0;index<MAX_KEY;index++) f{'N O`G  
   { JJP!9<  
    if(hCallWnd[index]==NULL) ?;go5f+X  
     continue; h0VeXUM;.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sWgzHj(c  
    { /(i~Hpp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); S's I[?\x  
     bProcessed=TRUE; J!zL)u|  
    } o1Wf#Zq   
   } -}Rh+n`  
  } 'gk^NAG2^E  
  if(!bProcessed){ N&u(9Fxn  
   for(int index=0;index<MAX_KEY;index++){ hud'@O"R+  
    if(hCallWnd[index]==NULL) ,9 .NMFn  
     continue; SN#N$] y5s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G<t _=j/r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); z'EphL7r   
   } b28C (  
  } AE%zqvp>  
 } 9cMMkOM J  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (HeIO  
} P;e@<O  
{d,^tG}  
BOOL InitHotkey() H"|oI|~  
{ ;{g>Z|  
 if(hHook!=NULL){ A@w9_qo  
  nHookCount++; v<?k$ e5  
  return TRUE; +#g4Crb  
 } x ~@%+d  
 else sAP  YQ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Ak2Vf0Eb  
  if(hHook!=NULL) 6Kd,(DI  
   nHookCount++; "o<&3c4  
  return (hHook!=NULL); &s&Ha{(!w  
} SwhArvS  
BOOL UnInit() e\]CZ5hs3  
{ 1ka58_^  
 if(nHookCount>1){ DZ5h<1  
  nHookCount--; _[J>GfQd  
  return TRUE; bw[K^/  
 }  ~&_BT`a  
 BOOL unhooked = UnhookWindowsHookEx(hHook); cA+O]",}  
 if(unhooked==TRUE){ pKk{Q0Rt  
  nHookCount=0; Dn;$4Dak(  
  hHook=NULL; y Xi$w.gr  
 } TK%MVLTK  
 return unhooked; 5U(ry6fI=  
} K.6xNQl{}  
O,7*dniH  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _ud !:q  
{ Eb\SK"8  
 BOOL bAdded=FALSE; })ic@ Mmd$  
 for(int index=0;index<MAX_KEY;index++){ $ ?YSAD1  
  if(hCallWnd[index]==0){ ':T6m=yv  
   hCallWnd[index]=hWnd; TfFH!1^+  
   HotKey[index]=cKey; %>:d5"&Lbs  
   HotKeyMask[index]=cMask; 9 N@N U:M+  
   bAdded=TRUE; &$_#{?dPt  
   KeyCount++; P.]O8r  
   break; D-\z'gS  
  } ,SoqVboRl  
 } x% Eu.jj  
 return bAdded; p87VJ}  
} <(2,@_~@r  
'FGf#l<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8x<; AL|`  
{ |'12Kv]#Xa  
 BOOL bRemoved=FALSE; </7?puVR  
 for(int index=0;index<MAX_KEY;index++){ n6 AP6PK7  
  if(hCallWnd[index]==hWnd){ QgW4jIbx  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ iYzm<3n?  
    hCallWnd[index]=NULL; ^2!l/(?  
    HotKey[index]=0; N >+L?C  
    HotKeyMask[index]=0; \-)augq([  
    bRemoved=TRUE; [+4--#&{  
    KeyCount--; &V7{J9  
    break; /9 soUt  
   } 8E\6RjM  
  } 2sXX0kq~V  
 } `n~bDG>  
 return bRemoved; ngQ]  
} n$(_(&  
O8WLulo  
void VerifyWindow() nHmi%R7k  
{ m=%WA5c?  
 for(int i=0;i<MAX_KEY;i++){ Ptv=Bwg  
  if(hCallWnd!=NULL){ 28PT1 9&  
   if(!IsWindow(hCallWnd)){ t0gLz J  
    hCallWnd=NULL; 5oE!^bF?  
    HotKey=0; (8OaXif  
    HotKeyMask=0; Q:!.YSB  
    KeyCount--; M }tr*L  
   } CZ_ (IT7  
  } O[#pB. 4  
 } MzO4Yv"A  
} BF>3CW7  
3 ~^}R  
BOOL CHookApp::InitInstance() &5F@u IA  
{ 7\1bq&a<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); R} aHo0r  
 hins=AfxGetInstanceHandle(); ,Q8)r0c  
 InitHotkey(); fu?Y'Qet  
 return CWinApp::InitInstance(); RzLbPSTQ  
} Ok&u4'<  
w6[uM%fHG  
int CHookApp::ExitInstance() `l8^n0-  
{ Upkw.`D`  
 VerifyWindow(); 6@@J>S>  
 UnInit(); Z &R{jQ,  
 return CWinApp::ExitInstance(); :3Hr: ~  
} wWR9dsB.;  
AT4G]pT  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `FL!L59nz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) RtVG6'Y  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hZ@Wl6FG;  
#if _MSC_VER > 1000 #x;i R8^  
#pragma once 3mnq=.<(w  
#endif // _MSC_VER > 1000 ?1u2P$d  
]MXeWS(  
class CCaptureDlg : public CDialog Z6I^HG{:  
{ bl;C=n  
 // Construction ngoAFb  
 public: o {bwWk7v6  
  BOOL bTray; O0i[GCtP5  
  BOOL bRegistered; gLef6q{}  
  BOOL RegisterHotkey(); { f@k2^  
  UCHAR cKey; s'/ g:aJ  
  UCHAR cMask; jP9)utEm6  
  void DeleteIcon(); [EETx-  
  void AddIcon(); A12#v,  
  UINT nCount; Pe_iA_  
  void SaveBmp(); {]w @s7E  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor t K+K lz  
  // Dialog Data Ph*tZrd*#  
  //{{AFX_DATA(CCaptureDlg) ^gpswhp 5  
  enum { IDD = IDD_CAPTURE_DIALOG }; *MFsq}\ $  
  CComboBox m_Key; T 6g(,xPcL  
  BOOL m_bControl; O67.DEu^  
  BOOL m_bAlt; vUXas*s4  
  BOOL m_bShift; cR+9^DzA  
  CString m_Path; b^Xq(q>5  
  CString m_Number; HJ2r~KIw  
  //}}AFX_DATA P]4C/UDS-~  
  // ClassWizard generated virtual function overrides BtN@P23>k.  
  //{{AFX_VIRTUAL(CCaptureDlg) )wROPA\uA  
 public: MR@*09zP(?  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  OBCRZ   
 protected: 4M&6q(389  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support M"eiKX  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ytXXZ`  
  //}}AFX_VIRTUAL 4EiEE{9V  
  // Implementation C=6Vd  
 protected: [p+6HF  
  HICON m_hIcon; e!67Na0X(  
  // Generated message map functions p9[J 9D3~  
  //{{AFX_MSG(CCaptureDlg) > T,^n {_v  
  virtual BOOL OnInitDialog(); 0b0.xz\~U  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); &?=UP4[oif  
  afx_msg void OnPaint(); d&x1uso%L  
  afx_msg HCURSOR OnQueryDragIcon(); 5};Nv{km^2  
  virtual void OnCancel(); )kSE5|:pi  
  afx_msg void OnAbout(); b=!G3wVw<  
  afx_msg void OnBrowse(); rQ^$)%uP  
  afx_msg void OnChange(); p}j$p'D.RI  
 //}}AFX_MSG n)(E 0h  
 DECLARE_MESSAGE_MAP() 4{d!}R  
}; JR1/\F<}  
#endif 85<zl|ZD  
OE(Z)|LF  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D<zgs2Ex  
#include "stdafx.h" 3sf+ uoV  
#include "Capture.h" 4  |E`  
#include "CaptureDlg.h" !'()QtvC<  
#include <windowsx.h> P%v7(bqL4+  
#pragma comment(lib,"hook.lib") e{~s\G8g  
#ifdef _DEBUG VQ/<MY C  
#define new DEBUG_NEW |.x |BJ  
#undef THIS_FILE ;=IGl:  
static char THIS_FILE[] = __FILE__; ]:m}nJ_  
#endif fD#VI   
#define IDM_SHELL WM_USER+1 piE9qXn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I |?zSFa  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X#$mBRK7  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ,nJYYM   
class CAboutDlg : public CDialog C%8jWc  
{ ?\ C7.of  
 public: dHnR)[?e  
  CAboutDlg(); ON{&-  
  // Dialog Data lZ5 lmsCU  
  //{{AFX_DATA(CAboutDlg) d`U{-?N>  
  enum { IDD = IDD_ABOUTBOX }; 7dXR/i\  
  //}}AFX_DATA y5L%_ {n  
  // ClassWizard generated virtual function overrides /h=:heS4$  
  //{{AFX_VIRTUAL(CAboutDlg) V/Q~NX N  
 protected: \lVxlc0{?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support H1H+TTZr  
  //}}AFX_VIRTUAL * _puW x  
  // Implementation &}P{w  
 protected: %,-oxeM1u  
  //{{AFX_MSG(CAboutDlg) ^w eU\  
  //}}AFX_MSG @tvAI2W  
  DECLARE_MESSAGE_MAP() ]g jhrD   
}; fdIk{o  
A`|OPi)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,4hQ#x  
{ ^[{\ZX  
 //{{AFX_DATA_INIT(CAboutDlg) rAK}rNxI  
 //}}AFX_DATA_INIT L`%v#R  
} 9|Cu2  
Zs _Jn  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) I^pD=1Y]  
{ /jdq7CF  
 CDialog::DoDataExchange(pDX); B1]dub9  
 //{{AFX_DATA_MAP(CAboutDlg) `Z*k M VN  
 //}}AFX_DATA_MAP  hfpSxL  
} D}1Z TX_  
-MrEJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0#~e KF y  
 //{{AFX_MSG_MAP(CAboutDlg) H]5%"(h  
 // No message handlers >}` q4U6$  
 //}}AFX_MSG_MAP K~p\B  
END_MESSAGE_MAP() ENwDW#U9  
ln#Jb&u  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) DGMvYNKTj  
: CDialog(CCaptureDlg::IDD, pParent) ~U+SK4SK:o  
{ rmj?jBKQU  
 //{{AFX_DATA_INIT(CCaptureDlg) lLy^@s  
  m_bControl = FALSE; "wi=aV9j  
  m_bAlt = FALSE; Iy\{)+}aS  
  m_bShift = FALSE; pCOr{I\  
  m_Path = _T("c:\\"); =k#SQ/@  
  m_Number = _T("0 picture captured."); L 0?-W%$>  
  nCount=0; eqK6`gHa6  
  bRegistered=FALSE; B[:-SWd  
  bTray=FALSE; 9ZjSM,+  
 //}}AFX_DATA_INIT  GU99!.$  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 kYwk'\s  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); !ydJ{\;  
} l$$N~FN  
VU7x w  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k H Y  
{ $+eDoI'f  
 CDialog::DoDataExchange(pDX); ^&iUC&8W  
 //{{AFX_DATA_MAP(CCaptureDlg) +Z0@z^6\  
  DDX_Control(pDX, IDC_KEY, m_Key); )jbYWR *&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); N5u.V\F!z\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); l?:!G7ie  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); #wH<W5gSZ  
  DDX_Text(pDX, IDC_PATH, m_Path); KlbL<9P >  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h$)},% e  
 //}}AFX_DATA_MAP iGmBG1a\  
} >'3J. FY  
G<9UL*HU  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8YJ8_$Z  
//{{AFX_MSG_MAP(CCaptureDlg) qP<wf=wY  
 ON_WM_SYSCOMMAND() @N?A 0S/  
 ON_WM_PAINT() "71@WLlN  
 ON_WM_QUERYDRAGICON() ,6Ulj+l  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) A+d&aE }3V  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) d&n&_>  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g3@Qn?(j!  
//}}AFX_MSG_MAP ]*a3J45  
END_MESSAGE_MAP() iOI8'`mk  
)En*5-1  
BOOL CCaptureDlg::OnInitDialog() h~rSM#7m  
{ _w8iPL5:  
 CDialog::OnInitDialog(); s^Lg*t 3I  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); y=)Cid  
 ASSERT(IDM_ABOUTBOX < 0xF000); B`,4M&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Rckqr7q  
 if (pSysMenu != NULL) @l~zn%!X  
 { |) {)w`  
  CString strAboutMenu; s u]x  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5\Sm^t|Tx  
  if (!strAboutMenu.IsEmpty()) HMT^gmF)  
  { F.i%o2P3  
   pSysMenu->AppendMenu(MF_SEPARATOR); .du FMJl  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5}FPqyK"  
  } /7Z;/|oU  
 } J8[N!qDCj  
 SetIcon(m_hIcon, TRUE); // Set big icon ^nn3;  
 SetIcon(m_hIcon, FALSE); // Set small icon 1Ao YG_  
 m_Key.SetCurSel(0); ,TY&N-  
 RegisterHotkey(); /*DC`,q  
 CMenu* pMenu=GetSystemMenu(FALSE); rJ)O(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )N!-g47o%#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Jwzkd"D  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); z>$AZ>t%J$  
 return TRUE; // return TRUE unless you set the focus to a control K@u\^6419  
} Yoy}Zdu}h  
 S^;D\6(r  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) A;E7~qOG  
{ Qzbelt@Wx  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) l :\DC  
 { lI HSy  
  CAboutDlg dlgAbout; R1Jj 3k  
  dlgAbout.DoModal(); )*_4=-8H  
 } 4$D:<8B  
 else m{itMZ@  
 { 0#f;/ c0i  
  CDialog::OnSysCommand(nID, lParam); HhkubG)\  
 } b= <xzvy  
} V_*TY6  
.\1{>A  
void CCaptureDlg::OnPaint() XKqUbi  
{ cX'&J_T+  
 if (IsIconic()) c%,~1l  
 { *G)=6\  
  CPaintDC dc(this); // device context for painting jFYv4!\ju  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /I@nPH<y  
  // Center icon in client rectangle ][R#Q;y<  
  int cxIcon = GetSystemMetrics(SM_CXICON); NQCJ '%L6  
  int cyIcon = GetSystemMetrics(SM_CYICON); }{<@wE%s  
  CRect rect; V<f76U)  
  GetClientRect(&rect); KCG-&p$v@s  
  int x = (rect.Width() - cxIcon + 1) / 2; nJH+P!AC  
  int y = (rect.Height() - cyIcon + 1) / 2; -s Iji)t  
  // Draw the icon B 14Ziopww  
  dc.DrawIcon(x, y, m_hIcon); i6F`KF'i&  
 } ?rqU&my S  
 else bN-ljw0&  
 { /lBx}o'  
  CDialog::OnPaint(); > D:( HWL  
 } GY9CU=-  
}  A i`  
FbRq h|  
HCURSOR CCaptureDlg::OnQueryDragIcon()  ?Y4$  
{  w+<`>  
 return (HCURSOR) m_hIcon; {%!.aQ,  
} Z6G>j  
"_Wv,CYmNr  
void CCaptureDlg::OnCancel()  =lIG#{`Q  
{ r@;n \  
 if(bTray) @ %LrpD  
  DeleteIcon(); 0_7A <   
  CDialog::OnCancel(); W| S{v7[l  
} Ys|n9pW  
Ms8& $  
void CCaptureDlg::OnAbout() -ZXC^zt  
{ x O`#a=  
 CAboutDlg dlg; 5AV5`<r.  
 dlg.DoModal(); P~Cx#`#(V  
} ~4YU  
 f,utA3[  
void CCaptureDlg::OnBrowse() vMOI&_[\z  
{  3LKL,z  
 CString str; Z["[^=EP  
 BROWSEINFO bi; JY4sB8  
 char name[MAX_PATH]; H4#|f n  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); f>d aK9$(  
 bi.hwndOwner=GetSafeHwnd(); V> K sbPqR  
 bi.pszDisplayName=name; k.b->U  
 bi.lpszTitle="Select folder"; DpG|Kl|d  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7;H!F!K]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi);  +z/_'DE  
 if(idl==NULL) EMy Med_  
  return; $`L!2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ^(5Up=.EA  
 str.ReleaseBuffer(); "PO>@tY  
 m_Path=str; P[NAO>&tX  
 if(str.GetAt(str.GetLength()-1)!='\\') -X#Zn>#  
  m_Path+="\\"; =bt/2 nPV  
 UpdateData(FALSE); {ir8n731p  
} 'xO5Le(=M  
z:C VzK,  
void CCaptureDlg::SaveBmp() u_+64c_7  
{ FM\yf ]'  
 CDC dc; /(#;(]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); gWcl@|I;\  
 CBitmap bm; yEm[C(gZ  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^_dYE]t  
 int Height=GetSystemMetrics(SM_CYSCREEN); d;GF<bz  
 bm.CreateCompatibleBitmap(&dc,Width,Height); iY @MnnX  
 CDC tdc; o/uA_19  
 tdc.CreateCompatibleDC(&dc); nSWW^ ;  
 CBitmap*pOld=tdc.SelectObject(&bm); 35 /)S@  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); D@ :w/W  
 tdc.SelectObject(pOld); I"/p^@IX  
 BITMAP btm; OV)J  
 bm.GetBitmap(&btm); hq}kAv4B=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; zNe>fZ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); >^vyp!  
 BITMAPINFOHEADER bih; 7v9l+OX,6  
 bih.biBitCount=btm.bmBitsPixel; QH:PClW![  
 bih.biClrImportant=0; u(W%snl  
 bih.biClrUsed=0; Q2wEt >0a  
 bih.biCompression=0; [se J'Io  
 bih.biHeight=btm.bmHeight; VFUuG3p)  
 bih.biPlanes=1; N 2|?I(\B  
 bih.biSize=sizeof(BITMAPINFOHEADER); *`]LbS  
 bih.biSizeImage=size; EjZ_|Q  
 bih.biWidth=btm.bmWidth; bDh,r!I  
 bih.biXPelsPerMeter=0; :q6j{C(  
 bih.biYPelsPerMeter=0; :Osw4u]JXd  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); E yJWi<  
 static int filecount=0; Eg&oAY.U  
 CString name; #:E}Eby/6I  
 name.Format("pict%04d.bmp",filecount++); <=fYz^|XT  
 name=m_Path+name; w9QY2v,U  
 BITMAPFILEHEADER bfh; l ;TWs_N  
 bfh.bfReserved1=bfh.bfReserved2=0; MXy~kb&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); GjDs,9@f  
 bfh.bfSize=54+size; sC ,[CN:b  
 bfh.bfOffBits=54; =7&2-'(@  
 CFile bf; ;0j 8Xj  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ v6r,2Va/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yb)!jLnH  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); tqdw y.  
  bf.WriteHuge(lpData,size); ]w2nVC 3  
  bf.Close(); S.,om;`  
  nCount++; FjUf|  
 } AcF6p)@_  
 GlobalFreePtr(lpData); N7/eF9  
 if(nCount==1) 1A>>#M=A  
  m_Number.Format("%d picture captured.",nCount); Y", :u@R  
 else E+>$@STv#  
  m_Number.Format("%d pictures captured.",nCount); |3tq.JU  
  UpdateData(FALSE); U Ps7{We W  
} eBw6k09C+  
9 gt$z}oU  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ][Ne;F6  
{ lFHj]%Y  
 if(pMsg -> message == WM_KEYDOWN) {rp5qgVE<  
 { .Sz<%d7XIQ  
  if(pMsg -> wParam == VK_ESCAPE) xiv1y4(%  
   return TRUE; 2<18j  
  if(pMsg -> wParam == VK_RETURN) [ArPoJt  
   return TRUE; GR@jn]50  
 } E_t ^osY&  
 return CDialog::PreTranslateMessage(pMsg); '`.bmiM  
} &YAw~1A  
P2lDi!q|  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~0S_S+e  
{ sj@B0R=Qo  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 7m{YWR0  
  SaveBmp(); KHK|Zu#k '  
  return FALSE; \EP<r  
} 0(+3w\_!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -ti nL(?3  
 CMenu pop; tvh)N{j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {5<3./5O  
 CMenu*pMenu=pop.GetSubMenu(0); s,KE,$5F   
 pMenu->SetDefaultItem(ID_EXITICON); x3dP`<   
 CPoint pt; 9?4EM^ -  
 GetCursorPos(&pt);  Fu@2gd  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); N{6 - rR  
 if(id==ID_EXITICON) $:v!*0/  
  DeleteIcon(); e!+_U C  
 else if(id==ID_EXIT) Hzd tR  
  OnCancel(); #;l~Y}7'  
 return FALSE; 9d4Agj M  
} 0~.OMG:=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x  RV@ _  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }Xn5M&>?  
 AddIcon(); Yv}V =O%  
 return res; pf_(?\oz>  
} LV$@J  
zkFx2(Hq-f  
void CCaptureDlg::AddIcon() 2m$\]\kCUv  
{ %hEhZW{:  
 NOTIFYICONDATA data; Oy> V/  
 data.cbSize=sizeof(NOTIFYICONDATA); $Tc"7nYu  
 CString tip; W{z7h[?5,  
 tip.LoadString(IDS_ICONTIP); A^ :/*  
 data.hIcon=GetIcon(0); 3bMQ[G  
 data.hWnd=GetSafeHwnd(); mW_B|dM"  
 strcpy(data.szTip,tip); e.8(tEqZ1  
 data.uCallbackMessage=IDM_SHELL; ]`p*ZTr)\  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^U[c:Rz  
 data.uID=98; /hx|KC&:e  
 Shell_NotifyIcon(NIM_ADD,&data); '?WKKYD7N  
 ShowWindow(SW_HIDE); jHP6d =  
 bTray=TRUE; +7HM7cw  
} O!Rw? Y  
(5-4`:1ux  
void CCaptureDlg::DeleteIcon() 5Z2tTw'i  
{ O@$wU9 D<  
 NOTIFYICONDATA data; ]!v:xjzT  
 data.cbSize=sizeof(NOTIFYICONDATA); ;ALkeUR[  
 data.hWnd=GetSafeHwnd(); 9DAk|K  
 data.uID=98; F;I %9-R  
 Shell_NotifyIcon(NIM_DELETE,&data); Y|NL #F  
 ShowWindow(SW_SHOW); ukZ>_ke`+  
 SetForegroundWindow(); G-vBJlt=t  
 ShowWindow(SW_SHOWNORMAL); vMDX  
 bTray=FALSE; T B!z:n  
} _[eAA4h  
;r**`O  
void CCaptureDlg::OnChange() 4P1<Zi+<  
{ epWTZV(1x  
 RegisterHotkey(); H)eecH$K  
} p2(U'x c  
!!jitFHzb  
BOOL CCaptureDlg::RegisterHotkey() m2j&v$  
{ /FP;Hsw%  
 UpdateData(); IWRo$Yu  
 UCHAR mask=0; )QeXA )  
 UCHAR key=0; ~Ogtgr  
 if(m_bControl) 3hN.`G-E  
  mask|=4; ^xBF$ua37)  
 if(m_bAlt) 7Nw} }  
  mask|=2; v>e%5[F  
 if(m_bShift) }ZP;kM$g  
  mask|=1; A7|CG[wZ  
  key=Key_Table[m_Key.GetCurSel()]; BCrX>Pp }r  
 if(bRegistered){ @raw8w\Zj+  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); @W{VT7w  
  bRegistered=FALSE; &}YJ"o[I  
 } Py&DnG'H  
 cMask=mask; 'G6M:IXno  
 cKey=key; o~ v   
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Jp'XZ]o\  
 return bRegistered; +Wr"c  
} I U Mt^z  
'dkKBLsx  
  四、小结 ZSB_OS[N  
X=sC8Edx  
  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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