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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: w>o/)TTJL  
  7^7Jh&b)/  
  一、实现方法 `W:z#uNG]  
+BVY9U?\"  
  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: p,.6sk  
#g/m^8n?s  
#pragma data_seg("shareddata") I^Dm 3yz  
HHOOK hHook =NULL; //钩子句柄 n?778Wo}  
UINT nHookCount =0; //挂接的程序数目 7`f%?xVn0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 M1icj~Jr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 u].7+{  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey iB|htH'T  
static int KeyCount =0; D94bq_2}  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 oY+p;&H  
#pragma data_seg() *M)M!jTv  
W7. +  
  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。 -xG6J.S  
O0FUJGuTS  
  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: gyb99c,)  
@qpj0i+>*  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "BVp37 m;?  
cKey,UCHAR cMask) B Dp")[l  
{ fTso[r:F.  
 BOOL bAdded=FALSE; Cs(sar:7  
 for(int index=0;index<MAX_KEY;index++){ 9Z21|5  
  if(hCallWnd[index]==0){ _RIlGs\.  
   hCallWnd[index]=hWnd; ah%Ws#&  
   HotKey[index]=cKey; mITNx^p4f  
   HotKeyMask[index]=cMask; I tb_ H  
   bAdded=TRUE; sopf-g:  
   KeyCount++; :}yT?LIyP  
   break; ?5jLN&A3 G  
  } |dz"uIrT  
 } |RXQ_|  
 return bAdded; $}.+}'7$  
} x5CMP%}d  
//删除热键 damG*-7Svx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r^a:s]  
{ "g)V&Lx#X  
 BOOL bRemoved=FALSE; c6lCF &  
 for(int index=0;index<MAX_KEY;index++){ 7nPcm;Er  
  if(hCallWnd[index]==hWnd){ $btu=_|f  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,zdGY]$  
    hCallWnd[index]=NULL; B;?)X&n|X  
    HotKey[index]=0; YVwpqOE.=  
    HotKeyMask[index]=0; 7f}uRXBV$A  
    bRemoved=TRUE; +ZwoA_k{  
    KeyCount--; - om9 Z0e  
    break; .1q}mw   
   } |1 "&[ .  
  } b _<n]P*)  
 } 9(J,&)J  
 return bRemoved; :SS \2  
} N[e,%heR  
SAdE9L =d  
Eamt_/LKf  
  DLL中的钩子函数如下: D*Zj oU  
4~&3.1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }%8ZN :  
{ x};~8lGT>t  
 BOOL bProcessed=FALSE; }L)[>  
 if(HC_ACTION==nCode) /wLGf]0  
 { L FkDb}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 A1INaL  
   switch(wParam) aTTkj\4  
   {  mmbe.$73  
    case VK_MENU: ;_vhKU)%J#  
     MaskBits&=~ALTBIT; S )rr  
     break; zQ |2D*W  
    case VK_CONTROL: yAryw{(  
     MaskBits&=~CTRLBIT; Zs />_w}  
     break; dI ,A;.  
    case VK_SHIFT: Q $}#&  
     MaskBits&=~SHIFTBIT; D9[19,2r`  
     break; o6px1C:  
    default: //judge the key and send message O{_t*sO9q*  
     break; LN WS  
   } v*?8:>:}  
   for(int index=0;index<MAX_KEY;index++){ eO <N/?t  
    if(hCallWnd[index]==NULL) /iFn =pk1?  
     continue; \Q|-Npw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) q* p  
    { X|T|iB,vT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Qdq;C,}Ai.  
     bProcessed=TRUE; .Qx5,)@9  
    } (vO3vCYeQ  
   } Q3 8+`EhLA  
  } SG)Fk *1  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~^1y(-cw  
   switch(wParam) 0[l}@K?  
   { Y7.+ Ma#|  
    case VK_MENU: <"5l<E  
     MaskBits|=ALTBIT; N!(mM;1X)  
     break; rJpr;QKf%  
    case VK_CONTROL: ZOEe-XW  
     MaskBits|=CTRLBIT; ?Ts]zO%%Z  
     break; bgi_QB#k\  
    case VK_SHIFT: v1,#7s AW'  
     MaskBits|=SHIFTBIT; /P*XB%y  
     break; x#EE_i/W  
    default: //judge the key and send message .jCGtR )%  
     break; _d@YLd78P  
   } 'Gn>~m  
   for(int index=0;index<MAX_KEY;index++){ ed,A'S= d  
    if(hCallWnd[index]==NULL) [f_^B U&  
     continue; }ssV"5M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HDH G~<s  
    { _ p\L,No  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2R&\qZ<  
     bProcessed=TRUE; qLmzA@Cv  
    } l;iU9<~  
   } XPX?+W=mv  
  } Mk}T  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 1,wcf,  
   for(int index=0;index<MAX_KEY;index++){ nqo{]fn  
    if(hCallWnd[index]==NULL) o pTXI*QA  
     continue; kkq1:\pZ]a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >9{?&#]x  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); e'K~WNT  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ~bZ$ d{o^  
   } 4aS}b3=n  
  } (bb!VVA  
 } ^X96yj'?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); VmqJMU>.  
} = wD#H@h  
4-yK!LR  
  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: PR@6=[|d  
6$R9Y.s>Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); AM}2=Ip  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); f;{Q ~  
Hh% !4_AMw  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: pp@ Owpb  
9hA`I tS  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0vv~G\yM  
{ p/ ITg  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) u_k[< &$  
 { t8*Jdd^3Z/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 `dZ|Ko%k  
  SaveBmp(); uV5uZ  
  return FALSE; ~&<#H+O  
 } ' h7Faj  
 …… //其它处理及默认处理 RNk|h  
} : "85w#r  
sy"}25s  
296}LW  
  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。 1@|+l!rYF  
`;UWq{"  
  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。 m{Q #f\<  
-ZaeX]^&Q\  
  二、编程步骤 ?\o~P  
@su<h\)  
  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"; OH t)z.  
"8f4s|@ 3  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;  QHNyH  
4m0^ N  
  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; %66="1z0@  
27SHj9I  
  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; GL n M1  
YlrN^rO  
  5、 添加代码,编译运行程序。 *JJ8\R&P0  
w/6X9d  
三、程序代码 4zyQ"?A~  
kOydh(yE  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0ID9=:J  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) \FsA-W\X  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8US#SI'x  
#if _MSC_VER > 1000 #gC [L=01  
#pragma once ]rv\sD`[  
#endif // _MSC_VER > 1000 ^+>*Y=fl  
#ifndef __AFXWIN_H__ `Z;Z^c  
#error include 'stdafx.h' before including this file for PCH OijuOLt  
#endif ]RT  
#include "resource.h" // main symbols A6]:BuP;c  
class CHookApp : public CWinApp Pxr/*X  
{ od)TQSo  
 public: d,^O[9UWo  
  CHookApp(); 16L YVvmW  
  // Overrides ;I4vPh5Q  
  // ClassWizard generated virtual function overrides ve d]X!  
  //{{AFX_VIRTUAL(CHookApp) O)q4^AE$  
 public: G0 )[(s  
  virtual BOOL InitInstance(); [.}qi[=n  
  virtual int ExitInstance(); KqG b+N-@  
  //}}AFX_VIRTUAL 2d .$V,U<  
  //{{AFX_MSG(CHookApp) On*I.~  
  // NOTE - the ClassWizard will add and remove member functions here. j}uL  
  // DO NOT EDIT what you see in these blocks of generated code ! =Kkqk  
  //}}AFX_MSG ?\Z pVL<>  
  DECLARE_MESSAGE_MAP() ,8 4|qI  
}; => (g_\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); rDWAZ<;;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a&%aads  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U6&`s%mIa  
BOOL InitHotkey(); XM:BMd|  
BOOL UnInit(); .aNh>`OT'  
#endif cp Ot?XYR~  
Jx+6Kq(  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1 m'.wh|  
#include "stdafx.h" hi"C<b.  
#include "hook.h" !/p|~K  
#include <windowsx.h> hQ|mow@Zmz  
#ifdef _DEBUG TQ(q [:>  
#define new DEBUG_NEW dEk#"cvg  
#undef THIS_FILE 21v--wZ  
static char THIS_FILE[] = __FILE__; 4;YP\{u  
#endif =p;cJ%#2]'  
#define MAX_KEY 100 (9u`(|x  
#define CTRLBIT 0x04 NZ1B#PG,c  
#define ALTBIT 0x02 F7<mm7BGZ  
#define SHIFTBIT 0x01 6:2*<  
#pragma data_seg("shareddata") 6u"wgX]H  
HHOOK hHook =NULL; +ay C 0  
UINT nHookCount =0; No7-fX1B  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 4np2I~ !  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }uIQ@f`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -- %XkO  
static int KeyCount =0; "pDU v^ie  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift A$wC !P|;  
#pragma data_seg() uj3`M9  
HINSTANCE hins; w%\ nXJ  
void VerifyWindow(); G u`xJ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) "bej#'M#  
//{{AFX_MSG_MAP(CHookApp) .JKH=?~\  
// NOTE - the ClassWizard will add and remove mapping macros here. g"/n95k<  
// DO NOT EDIT what you see in these blocks of generated code! 7g*!6-W[  
//}}AFX_MSG_MAP Cj>HMB}  
END_MESSAGE_MAP() j& 7>ph  
uf?;;wg  
CHookApp::CHookApp() ]+e zg(C}  
{ RJ?)O#}  
 // TODO: add construction code here, %X_A#9  
 // Place all significant initialization in InitInstance ,[ 2N3iH  
} Q b^{`  
5 SQ!^1R 9  
CHookApp theApp; uRy}HLZ"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) (*A@V%H  
{ .M:&Aj)x16  
 BOOL bProcessed=FALSE; +j: &_  
 if(HC_ACTION==nCode) L!JC)p.  
 { l=xG<)Okb  
  if((lParam&0xc0000000)==0xc0000000){// Key up KOg,V_(I  
   switch(wParam) )y] Dmm  
   { UI=v| <'-  
    case VK_MENU: al#(<4sJ  
     MaskBits&=~ALTBIT; l'l&Zqd  
     break; 2Ug_3ZuU  
    case VK_CONTROL: !Mw/j`*  
     MaskBits&=~CTRLBIT; 'Qt[cW  
     break; >C,0}lj  
    case VK_SHIFT: |gV~U~A]  
     MaskBits&=~SHIFTBIT; i@:^b_  
     break; 7s%D(;W_Mo  
    default: //judge the key and send message | K|AUI  
     break; 6c+29@  
   } ` u3kP  
   for(int index=0;index<MAX_KEY;index++){ 4j;IyQDvM  
    if(hCallWnd[index]==NULL) 3q4VH q  
     continue; ot7f?tF2<J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C1A  X  
    { G!`%.tH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @|\;#$?XW3  
     bProcessed=TRUE; skeeec\V  
    } <nJGJ5JJ  
   } * 0K]/tn<  
  } u"5/QB{  
  else if((lParam&0xc000ffff)==1){ //Key down z~Zm1tZs  
   switch(wParam) iM!V4Wih6  
   { CXn?~m&K  
    case VK_MENU: ;PVE= z+y  
     MaskBits|=ALTBIT; +;!^aNJ,  
     break; o?O ZsA  
    case VK_CONTROL: _&(Wz0  
     MaskBits|=CTRLBIT; ,ng/T**@G  
     break; v$`3}<3-  
    case VK_SHIFT: ^Zs ^  
     MaskBits|=SHIFTBIT; >l}v _k*~B  
     break; j*2/[Eq  
    default: //judge the key and send message >WO;q  
     break; '3^_:E5y  
   } n{|j#j  
   for(int index=0;index<MAX_KEY;index++) B$c'^ )  
   { pV<K=;:x>  
    if(hCallWnd[index]==NULL) DB"z93Mr<K  
     continue; s4 , `  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DFfh!KKR$  
    { QBmARQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); |1kA6/  
     bProcessed=TRUE; @ #J2t#  
    } S]E|a@kD3  
   } %b pQ=  
  } .4 NcaMj  
  if(!bProcessed){  ]x1ba_  
   for(int index=0;index<MAX_KEY;index++){ E0i!|H  
    if(hCallWnd[index]==NULL) Oxu}W%BF*  
     continue; Aa-OMo;~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) NxH%%>o>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4 J9Y  
   } T*k{^=6"!  
  } Yh,,(V6  
 } ]q #"8 =  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (<`> B  
} i @M^l`w  
uf )!SxT  
BOOL InitHotkey() 3DjX0Dx/l  
{ d<] eJ{  
 if(hHook!=NULL){ {Y+e|B0  
  nHookCount++; _B&;z $  
  return TRUE; \= 6dF,V  
 } 'uqY%&U  
 else aE]RVyG@L  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); UZJs!#P  
  if(hHook!=NULL)  ^AwDZX  
   nHookCount++; gf;B&MM6  
  return (hHook!=NULL); 1b7Q-elG  
} F6{Q1DqI  
BOOL UnInit() 2j^8{Agz  
{ O8*yho  
 if(nHookCount>1){ q\s>Oe6$  
  nHookCount--; /GP:W6:6z6  
  return TRUE; FYaBP;@J%  
 } #FGj)pu  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :Mu]* N  
 if(unhooked==TRUE){ 0VgsV;  
  nHookCount=0; #9(iu S+BU  
  hHook=NULL; {bNKyT  
 } )"bP]t^_  
 return unhooked;  ~Ctq  
} f2P2wt.$  
T ^`R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Coe%R(x5  
{ &K"qnng/y  
 BOOL bAdded=FALSE; eeUEqM$7EX  
 for(int index=0;index<MAX_KEY;index++){ /a-OB U  
  if(hCallWnd[index]==0){ Eye.#~  
   hCallWnd[index]=hWnd; }(UU~V  
   HotKey[index]=cKey; DvBRK}'  
   HotKeyMask[index]=cMask; V*+Z=Y'  
   bAdded=TRUE; C/z0/mk  
   KeyCount++; ^,fMs:  
   break; I|P#|0< 2  
  } @3Mp>u/  
 } eBl B0P  
 return bAdded; Qvhy9Cr;  
} &(X-b"2  
wn>?r ?KIB  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) MM/D5g  
{ =(as{,j  
 BOOL bRemoved=FALSE; {r[g.@  
 for(int index=0;index<MAX_KEY;index++){ fJOA5(  
  if(hCallWnd[index]==hWnd){ ^14a[ta/'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,a@jg&Mb]  
    hCallWnd[index]=NULL; 5l /EZ\q  
    HotKey[index]=0; |D[4 G6&  
    HotKeyMask[index]=0; K2oyHw<mk  
    bRemoved=TRUE; 0bI} s`sr  
    KeyCount--; ~`CWpc:  
    break; @]:GTrs  
   } !Im{-t  
  } ,wH]|`w  
 } R(cM4T.a  
 return bRemoved; ood,k{  
} 5| bc*iqU  
KFn[  
void VerifyWindow() UZ 6:vmcT  
{ J4^aD;j  
 for(int i=0;i<MAX_KEY;i++){ ]^DNzqu=@h  
  if(hCallWnd!=NULL){ UN Kr FYl  
   if(!IsWindow(hCallWnd)){ :x@j)&  
    hCallWnd=NULL; CUZ ;<Pn  
    HotKey=0; ycSC'R  
    HotKeyMask=0; qHra9yuSh  
    KeyCount--; xa|/P#q  
   } 85]3y%f9  
  } |qX[Dk  
 } Ld:U~M-  
} t73" d#+  
_|vY)4B 4U  
BOOL CHookApp::InitInstance() -jQM h  
{ 2<8JY4]!]  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^+'\ u;\  
 hins=AfxGetInstanceHandle(); o[E|xw  
 InitHotkey(); Jde@T h  
 return CWinApp::InitInstance(); DE_ <LN  
} kF29~  
7c aV-8:  
int CHookApp::ExitInstance() !1cVg ls|  
{ z)U/bjf  
 VerifyWindow(); wDz}32wB  
 UnInit(); MY" 8!  
 return CWinApp::ExitInstance(); wj#A#[e  
} QFX )Nov];  
68-2EWq  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;f+bIYQz  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ;{hE]jReH  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ g|rbkK%SoE  
#if _MSC_VER > 1000 af<wUxM0  
#pragma once T+U,?2nF:  
#endif // _MSC_VER > 1000 6y+}=)J  
f?|cQ[#t!\  
class CCaptureDlg : public CDialog 1a>TJdoa  
{ 2UJjYrm  
 // Construction  {;| >Qn  
 public: }hyl)?*~  
  BOOL bTray; t1MK5B5jH  
  BOOL bRegistered; Nr#" 5<W  
  BOOL RegisterHotkey(); 5T- N\)@  
  UCHAR cKey; aokV'6  
  UCHAR cMask; nb,+!)+  
  void DeleteIcon(); T99\R%  
  void AddIcon(); 0$A7"^]  
  UINT nCount; W2W4w  
  void SaveBmp(); tEE4"OAy  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor #<EMG|&(  
  // Dialog Data i]M:ntB"  
  //{{AFX_DATA(CCaptureDlg) 0G}]d17ho  
  enum { IDD = IDD_CAPTURE_DIALOG }; na,i(m?l  
  CComboBox m_Key; !H/5Ud9  
  BOOL m_bControl; VYC$Q;Z  
  BOOL m_bAlt; uA~T.b\  
  BOOL m_bShift; %e|.a)78  
  CString m_Path; 7IUu] Fi  
  CString m_Number; 1K&l}/zUl  
  //}}AFX_DATA ]mSkjKw  
  // ClassWizard generated virtual function overrides w:+wx/\  
  //{{AFX_VIRTUAL(CCaptureDlg) |QcE5UC  
 public: ('Doy1L  
  virtual BOOL PreTranslateMessage(MSG* pMsg); CPt62j8  
 protected: ,ctm;T1H+  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E/IoYuB  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); q@0g KC&U  
  //}}AFX_VIRTUAL yHIZpU|(j  
  // Implementation t+<?$I[  
 protected: ;2%8tV$V  
  HICON m_hIcon; .5K}R<  
  // Generated message map functions c|KN@)A  
  //{{AFX_MSG(CCaptureDlg) MQvk& AX  
  virtual BOOL OnInitDialog(); CS|al(?~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); hF;TX.Y6  
  afx_msg void OnPaint(); {$fd?| 9h  
  afx_msg HCURSOR OnQueryDragIcon(); sm9/sX!  
  virtual void OnCancel(); ngI3.v/R  
  afx_msg void OnAbout(); _Z{EO|L  
  afx_msg void OnBrowse(); [oS4W P  
  afx_msg void OnChange(); o`+$h:zm@  
 //}}AFX_MSG [B+]F~}@  
 DECLARE_MESSAGE_MAP() +u\kTn  
}; o7=#ye&P  
#endif EPu-oE=HW4  
A8oTcX_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jWjp0ii  
#include "stdafx.h" Wv7hY"  
#include "Capture.h" xixdv{M<FF  
#include "CaptureDlg.h" v{c,>]@  
#include <windowsx.h> V(c>1xLlz  
#pragma comment(lib,"hook.lib") 5zi}O GtXv  
#ifdef _DEBUG odsLFU(  
#define new DEBUG_NEW "eG@F  
#undef THIS_FILE r~q 3nIe/,  
static char THIS_FILE[] = __FILE__; 7I4<Dj  
#endif U"L 7G$  
#define IDM_SHELL WM_USER+1 u/ZV35z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); EV.F/W h  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PL|zm5923  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 3)0z(30  
class CAboutDlg : public CDialog LTlbrB  
{ (\$=de>?  
 public: k;V (rf`  
  CAboutDlg(); + J` Qv,0  
  // Dialog Data R8bKE(*rxj  
  //{{AFX_DATA(CAboutDlg) P1qQ)-J  
  enum { IDD = IDD_ABOUTBOX }; ,+GS.]8<  
  //}}AFX_DATA Ls6C*<8  
  // ClassWizard generated virtual function overrides 1G<S'd+N  
  //{{AFX_VIRTUAL(CAboutDlg) s8V:;$ !  
 protected: ^Gwpx +  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support E/@  
  //}}AFX_VIRTUAL F!7\Za,  
  // Implementation E]dc4US  
 protected: ^d@ME<mb  
  //{{AFX_MSG(CAboutDlg) w:nLm,  
  //}}AFX_MSG u2 t=*<X  
  DECLARE_MESSAGE_MAP() D5"Xjo*  
}; rd1EA|T  
iiLDl  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zGaqYbQD  
{ ?*L{xNC#  
 //{{AFX_DATA_INIT(CAboutDlg) >UnLq:G  
 //}}AFX_DATA_INIT a3J' c  
} WX4 f3Um  
YkF52_^_  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) aJLc&o 8Yg  
{ I3;03X<2  
 CDialog::DoDataExchange(pDX); Aaug0X  
 //{{AFX_DATA_MAP(CAboutDlg) 5Zuk`%O  
 //}}AFX_DATA_MAP 4L/nEZ!Nsu  
} 9_x rw:4  
k2/t~|5  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) F/u i(4  
 //{{AFX_MSG_MAP(CAboutDlg) F60?%gg  
 // No message handlers SZD7"m4  
 //}}AFX_MSG_MAP Ij2T h]  
END_MESSAGE_MAP() _[h!r;DsG  
uaqV)H  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "EBCf.3-  
: CDialog(CCaptureDlg::IDD, pParent) I{i6e'.jP  
{ 0@wXE\s  
 //{{AFX_DATA_INIT(CCaptureDlg) 8Om4G]*|,  
  m_bControl = FALSE; !.{"Ttn;s  
  m_bAlt = FALSE; a7sX*5t{R  
  m_bShift = FALSE; H"c2kno9  
  m_Path = _T("c:\\"); &2r[4  
  m_Number = _T("0 picture captured."); {~`{bnx^]7  
  nCount=0; )Lg~2]'?j  
  bRegistered=FALSE; L cTTfb+<  
  bTray=FALSE; ,z~"Mst  
 //}}AFX_DATA_INIT L),r\#Y(v  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 K0|:+s@u  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); X7txAp.  
} nh? JiH {  
<6&Z5mpm$w  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )cU$I)  
{ vi]cl=S  
 CDialog::DoDataExchange(pDX); ujf7r`;u.  
 //{{AFX_DATA_MAP(CCaptureDlg) xAr&sGMA  
  DDX_Control(pDX, IDC_KEY, m_Key); e4FR)d0x  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); W9;9\k  
  DDX_Check(pDX, IDC_ALT, m_bAlt); K"zRj L+  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); C=t9P#g*.  
  DDX_Text(pDX, IDC_PATH, m_Path); qfqL"G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,I H~  
 //}}AFX_DATA_MAP 5 p ,HkV  
} G4ycP8  
EUW>8kw0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +zK?1llt  
//{{AFX_MSG_MAP(CCaptureDlg) HGF&'@dn  
 ON_WM_SYSCOMMAND() Sa@T#%oU  
 ON_WM_PAINT() Ymf@r?F<  
 ON_WM_QUERYDRAGICON() `A<2wd;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o%*C7bU  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) m#<Jr:-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) pTT00`R  
//}}AFX_MSG_MAP rDGrq9  
END_MESSAGE_MAP() VAA="yN  
n. vrq-  
BOOL CCaptureDlg::OnInitDialog() Hc-up.?v'v  
{ N*+WGsxl$z  
 CDialog::OnInitDialog(); $xis4/2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |l@z7R+4*  
 ASSERT(IDM_ABOUTBOX < 0xF000); sQ+s3x1y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ^oR qu  
 if (pSysMenu != NULL) R ^ZOcONd-  
 { 'K\H$<CJ  
  CString strAboutMenu; #kE8EhQZ  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5s@xpWVot  
  if (!strAboutMenu.IsEmpty()) DVf}='en8  
  { g_0| `Sm  
   pSysMenu->AppendMenu(MF_SEPARATOR); ' H4m"  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); O$N;a9g  
  } !?lvmq  
 } dH'02[;  
 SetIcon(m_hIcon, TRUE); // Set big icon B>c2 *+Bk  
 SetIcon(m_hIcon, FALSE); // Set small icon '}:(y$9.`  
 m_Key.SetCurSel(0); ia,5=SKJ  
 RegisterHotkey(); '6\ZgOO9  
 CMenu* pMenu=GetSystemMenu(FALSE); 0O>M/ *W  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "H=N>=g0E  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); *9|p}q9n  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); D&i, `j  
 return TRUE; // return TRUE unless you set the focus to a control h!Y##_&&4  
} 2vhP'?;K  
1/i1o nu}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M+%qVwp  
{ JSID@ n<b?  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4iZg2"[D  
 { RJKi98xwJ  
  CAboutDlg dlgAbout; mg" _3].j  
  dlgAbout.DoModal(); `jyyRwSoe  
 } 0|C !n+OK  
 else 5>UQ3hWo  
 { :*^aSPlV  
  CDialog::OnSysCommand(nID, lParam); $zF%F.rln  
 } 3177R>0  
} ,*YmXR-"  
sbhzER  
void CCaptureDlg::OnPaint() IZ iS3  
{ j"fx|6l)  
 if (IsIconic()) 9JX@c k  
 { %I{>H%CjE  
  CPaintDC dc(this); // device context for painting pvb&vtp  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z1:<i*6>D  
  // Center icon in client rectangle ^Wn+G8n  
  int cxIcon = GetSystemMetrics(SM_CXICON); HF"TS*  
  int cyIcon = GetSystemMetrics(SM_CYICON); oE6`]^^  
  CRect rect; 8@LUL)"  
  GetClientRect(&rect); z30 mk  
  int x = (rect.Width() - cxIcon + 1) / 2; dQ _4aO  
  int y = (rect.Height() - cyIcon + 1) / 2; #Ma:Av/ )  
  // Draw the icon g^x=y  
  dc.DrawIcon(x, y, m_hIcon); JYmYX-  
 } [h !i{QD  
 else J*Ie# :J]  
 { "K$c9Z8  
  CDialog::OnPaint(); <&gs)BY  
 } B}.:7,/0  
} fM|s,'Q1x  
WRwx[[e6z  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,>za|y<n  
{ sC.r$K+k5  
 return (HCURSOR) m_hIcon; _0FMwC#DY  
} uB3VCO.;_  
G 9 (*F  
void CCaptureDlg::OnCancel()  +a%D+  
{ iSR"$H{  
 if(bTray) f6Lc"b3s1  
  DeleteIcon(); mEu2@3^E }  
  CDialog::OnCancel();  "\T-r2  
} (6NDY5h~=n  
68(^*  
void CCaptureDlg::OnAbout() 43-Bx`6\  
{ H V-;? 5  
 CAboutDlg dlg; ARt{ 2|  
 dlg.DoModal(); []aw;\7}Y  
} p Zlt4  
NZ&ZK@h}.  
void CCaptureDlg::OnBrowse() J~4mp\4b  
{ ^Ifm1$X}  
 CString str; { dh,sbl  
 BROWSEINFO bi; 6<>1,wbq  
 char name[MAX_PATH]; O[eU{ ;P  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _9H]:]1QH  
 bi.hwndOwner=GetSafeHwnd(); & 0\:MJc  
 bi.pszDisplayName=name; ?U[6X| 1  
 bi.lpszTitle="Select folder"; MRK=\qjD  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @: =vK?8L  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @ S[As~9X  
 if(idl==NULL) `OgT"FdL!  
  return; s$qc &  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 6}Tftw$0z  
 str.ReleaseBuffer(); _&U#*g  
 m_Path=str; %4F\#" A  
 if(str.GetAt(str.GetLength()-1)!='\\') u-s*k*VHoc  
  m_Path+="\\"; CLe{9-o  
 UpdateData(FALSE); Z<^EZX3N  
} V|B4lGS&  
>5Lp;  
void CCaptureDlg::SaveBmp() K1A<m=If  
{ y!}XlllV  
 CDC dc; 4e.19H9  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); }F/w34+;  
 CBitmap bm; ti6X=@ P:  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ayg^<)JWh  
 int Height=GetSystemMetrics(SM_CYSCREEN); lF.kAEC  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )*XWe|H_  
 CDC tdc; Vp~ cN  
 tdc.CreateCompatibleDC(&dc); iu*&Jz)D>  
 CBitmap*pOld=tdc.SelectObject(&bm); p=A, yGDV  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); dQ-shfTr]  
 tdc.SelectObject(pOld); \,X)!%6kZ  
 BITMAP btm; d0ht*b  
 bm.GetBitmap(&btm); [kqtkgK$j2  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r)Lm| S  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *c=vEQn-  
 BITMAPINFOHEADER bih; Oso**WUOZ&  
 bih.biBitCount=btm.bmBitsPixel; nh5=0{va|L  
 bih.biClrImportant=0; WjK[% ;Z!  
 bih.biClrUsed=0; dR< d7  
 bih.biCompression=0; 9kF0H a}J  
 bih.biHeight=btm.bmHeight; .zt&HI.F  
 bih.biPlanes=1; ]1>R8  
 bih.biSize=sizeof(BITMAPINFOHEADER); "+7E9m6I  
 bih.biSizeImage=size; 9$e$L~I#u  
 bih.biWidth=btm.bmWidth; 3imsIBr  
 bih.biXPelsPerMeter=0; czu9a"M>X  
 bih.biYPelsPerMeter=0; k[ D,du')  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); UjoA$A!Od;  
 static int filecount=0; ~&RrlFh  
 CString name; G rU`;M"  
 name.Format("pict%04d.bmp",filecount++); I;E?;i  
 name=m_Path+name; tN\I2wm  
 BITMAPFILEHEADER bfh; 'NCqI  
 bfh.bfReserved1=bfh.bfReserved2=0; l=l$9H,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5VOw}{Pt  
 bfh.bfSize=54+size; $.d,>F6  
 bfh.bfOffBits=54; %~M*<pN  
 CFile bf; {'wvb "b  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 0k16f3uI   
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Lp(`m=;O  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); C"**>OGe  
  bf.WriteHuge(lpData,size); 6.KEe^[-  
  bf.Close(); TB.>?*<n]  
  nCount++; : Bo  
 } 3~3tjhw;]9  
 GlobalFreePtr(lpData); )~R[aXkvY  
 if(nCount==1) ]N'% l]_$  
  m_Number.Format("%d picture captured.",nCount); ~D|,$E tX4  
 else V-go?b`  
  m_Number.Format("%d pictures captured.",nCount); \a|~#N3?  
  UpdateData(FALSE); 1`L.$T,1!  
} Y %bb-|\W  
1~~GF_l?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q"{Dijc%  
{ <W8 %eRfU  
 if(pMsg -> message == WM_KEYDOWN) 5rck]L'  
 { ^c}3o|1m(  
  if(pMsg -> wParam == VK_ESCAPE) E8#aE\'t  
   return TRUE; DMch88W  
  if(pMsg -> wParam == VK_RETURN) !\1)?&y9j  
   return TRUE; @SxZ>|r-|v  
 } wS9V@  
 return CDialog::PreTranslateMessage(pMsg); IaSPwsvt'  
} XPMUhozV  
~? aFc)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {X?1}5ry  
{ uk$MQ v*D  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KyVzf(^  
  SaveBmp(); p\;8?x  
  return FALSE; w{[^  
} U n)Xe  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ =,N"% }  
 CMenu pop; ~<K,P   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); qQDe'f~  
 CMenu*pMenu=pop.GetSubMenu(0); `!I/6d?A  
 pMenu->SetDefaultItem(ID_EXITICON); Os>&:{D4!  
 CPoint pt; &gS-.{w "  
 GetCursorPos(&pt); ,|VLOY ^  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); c\rP -"C  
 if(id==ID_EXITICON) Nk\ni>Du3  
  DeleteIcon(); P nE7}  
 else if(id==ID_EXIT) aL&egM*  
  OnCancel(); ZLKbF9lo  
 return FALSE; k -R"e  
} ue7D' UZL>  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); &W<9#RPK'  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PbvA~gm  
 AddIcon(); 9QHj$)?k,  
 return res; R8lja%+0$  
} :qj^RcmVPL  
~PyS;L}  
void CCaptureDlg::AddIcon() jGkDD8K [  
{ P(@Q[XQ2  
 NOTIFYICONDATA data; mpk+]n@  
 data.cbSize=sizeof(NOTIFYICONDATA); 1@'I eywg  
 CString tip; "pK<d~Wu  
 tip.LoadString(IDS_ICONTIP); jf;n*  
 data.hIcon=GetIcon(0); /]J\/Z>  
 data.hWnd=GetSafeHwnd(); s Adb0 A  
 strcpy(data.szTip,tip); 1CZO+MB&"$  
 data.uCallbackMessage=IDM_SHELL; Z~94<*LEp  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 5 Slz ^@n  
 data.uID=98; ]CcRI|g}  
 Shell_NotifyIcon(NIM_ADD,&data);  H6nH  
 ShowWindow(SW_HIDE); 2<8l&2}7]  
 bTray=TRUE; pV8tn!  
} b1'849i'y=  
R%}<z*~NE@  
void CCaptureDlg::DeleteIcon() v]Pyz<+  
{ G~&8/ s  
 NOTIFYICONDATA data; 2o[ceEg  
 data.cbSize=sizeof(NOTIFYICONDATA); NA0Z~Ug>  
 data.hWnd=GetSafeHwnd(); {0,6- dd5  
 data.uID=98; G{X7;j e  
 Shell_NotifyIcon(NIM_DELETE,&data); { )b  
 ShowWindow(SW_SHOW); FhBV.,bU,m  
 SetForegroundWindow(); t~ I;IB  
 ShowWindow(SW_SHOWNORMAL); ~AaEa,LQ  
 bTray=FALSE; T ?A3f]U  
} lq3D!+ m  
dJrUcZBr  
void CCaptureDlg::OnChange() m0.g}N-w  
{ +{;wOQ.  
 RegisterHotkey(); :F[s  
} se>\5k  
]i,o+xBKH  
BOOL CCaptureDlg::RegisterHotkey() ^A\(M%*F  
{ 7KUf,0D  
 UpdateData(); Pz D30VA  
 UCHAR mask=0; RRQv<x  
 UCHAR key=0; gWjr|m<  
 if(m_bControl) x _-V{ k  
  mask|=4; iYYuZ.  
 if(m_bAlt) RTg\c[=w  
  mask|=2; <9xr? i=  
 if(m_bShift) 4=y&}3om(0  
  mask|=1; 0cfGI%  
  key=Key_Table[m_Key.GetCurSel()]; 6q`)%"4k  
 if(bRegistered){ "D4% A!i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); #k &#d9}  
  bRegistered=FALSE; ZO<\rX (  
 } Vz-q7*o $S  
 cMask=mask; Dz2Z (EXI~  
 cKey=key; :?ZrD,D  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Us# /#-hJ  
 return bRegistered; J2oh#TGp  
} x}WP1YyT~  
D-i, C~W  
  四、小结 w03Ur4>T  
U6H3T0#  
  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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