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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: >"|t*k S  
  ):}A Quy]  
  一、实现方法 KmM:V2@A$  
B@VAXmCaoV  
  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: 8G9( )UF.  
{MTtj4$  
#pragma data_seg("shareddata") 4HX;9HPHE<  
HHOOK hHook =NULL; //钩子句柄 412E7   
UINT nHookCount =0; //挂接的程序数目 ;DVg[#  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 6l &!4r@}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 h@\HPYi#.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey |.&GmP  
static int KeyCount =0; (0.JoeA`y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 s.n:;8RibP  
#pragma data_seg() bD|"c  
K[ S>EITr  
  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。 SBf=d<j 1)  
n:b,zssP  
  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: W:6#0b"_#  
Dhfor+Epy  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Kv<mDA!  
cKey,UCHAR cMask) |"9vq<`  
{ YnW9uy5  
 BOOL bAdded=FALSE; Ro<x#Uo  
 for(int index=0;index<MAX_KEY;index++){ HDKY7Yr  
  if(hCallWnd[index]==0){ e"XolM0IM  
   hCallWnd[index]=hWnd; H\N} 0^ea  
   HotKey[index]=cKey; o@]n<ZYo  
   HotKeyMask[index]=cMask; Wg,@S*x(  
   bAdded=TRUE; ZM <UiN  
   KeyCount++; VM\\.L  
   break; lN{>.q@V`r  
  } JO&RuAq  
 } ~ Fl\c-  
 return bAdded; pF8:?p['z  
} O, :|  
//删除热键 B4+c3M\$V  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ko'V8r `V  
{ |TkicgeS  
 BOOL bRemoved=FALSE; aI`d  
 for(int index=0;index<MAX_KEY;index++){ Br&&#  
  if(hCallWnd[index]==hWnd){ b9 li   
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @\xEK5SG  
    hCallWnd[index]=NULL; Cw kQhj?  
    HotKey[index]=0; \F\7*=xk  
    HotKeyMask[index]=0; hE'7M;  
    bRemoved=TRUE; 9f5~hBlo  
    KeyCount--; HU4h.Lm  
    break; m(kv:5<>  
   } ,H mGp  
  } M(C}2.20  
 } @Gw]cm  
 return bRemoved; $vYy19z  
} $#W^JWN1  
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>TawJ"q-6R  
  DLL中的钩子函数如下: B> \q!dX3  
k]RQ 7e  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *-q &~  
{ ]gv3|W  
 BOOL bProcessed=FALSE; D+jvF  
 if(HC_ACTION==nCode) EGFPv'De  
 { '.S02=/  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 T('rM :)/  
   switch(wParam) NE) w$>0M  
   {  h<PS<  
    case VK_MENU: Nt?=0X|M  
     MaskBits&=~ALTBIT; ;4/ n~  
     break; HJpx,NU'  
    case VK_CONTROL: ~HT:BO$  
     MaskBits&=~CTRLBIT; n-qle5sj  
     break; I|c?*~7*  
    case VK_SHIFT: T%Zfo7  
     MaskBits&=~SHIFTBIT; Xq ew~R^MP  
     break; K>XZrt  
    default: //judge the key and send message O~ x{p,s U  
     break; ^( 7l!  
   } HxL uJ  
   for(int index=0;index<MAX_KEY;index++){ .N\t3\9}  
    if(hCallWnd[index]==NULL) v{*2F  
     continue; > #9 a&O  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0D  `9  
    { Iq6EoDoq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )fS6H<*  
     bProcessed=TRUE; <+b~E,  
    } .i` -t"  
   } M;KeY[u  
  } \X]I: 0^j  
  else if((lParam&0xc000ffff)==1){ //有键按下 9O^~l2`  
   switch(wParam) r4K%dx-t  
   { CR#-!_=4  
    case VK_MENU: JPgFTr  
     MaskBits|=ALTBIT; o4z|XhLr  
     break; [<f9EeziB  
    case VK_CONTROL: `G*fx=N  
     MaskBits|=CTRLBIT; >^<;;8Xh  
     break; @KZW*-"  
    case VK_SHIFT: H,j_2JOY=  
     MaskBits|=SHIFTBIT; \]\GDpu[  
     break; ;\ j'~AyCn  
    default: //judge the key and send message XZ8]se"C  
     break; XJq]l6a:  
   } Uz]=`F8  
   for(int index=0;index<MAX_KEY;index++){ />>KCmc  
    if(hCallWnd[index]==NULL) |&bucG=  
     continue; hW;n^\lF#e  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FS('*w&bP  
    { .=hVto[QC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y2g%{keo  
     bProcessed=TRUE; lC d\nE8G  
    } bV#j@MJ~0  
   } .&>3nu  
  } X1V~.k vt)  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;~`/rh V\  
   for(int index=0;index<MAX_KEY;index++){ 1$m{)Io2(  
    if(hCallWnd[index]==NULL) Un5 AStG  
     continue; >.XXB 5a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F2)KAIl  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); cnG>EG  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 u:wijkx  
   } nmuU*o L  
  } X@)'E9g5:  
 } m-cw5lW  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (4rHy*6  
} *Rc?rMF!  
s]D1s%Mx  
  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: lfR}cx  
#TeAw<2U  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3 rLc\rK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 67Pmnad  
GyQFR?  
  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: qX-5/;n  
~s HdOMw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;u'VR}4ph  
{ 0/f|ZH ~!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) h0 92S|iY  
 { zu @|"f^`  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $aJay]F  
  SaveBmp(); P`Ku. ONQ  
  return FALSE; 6z U  
 } # 2^H{7  
 …… //其它处理及默认处理 dyn)KDS  
} 8el6z2  
w(ZZTVW-  
o;Z"I&  
  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。 #?S"y:  
,S`n?.&& 7  
  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。 )yig=nn  
#btf|\D  
  二、编程步骤 8ly)G  
 ]aF;  
  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"; sd%)g<t  
QEt"T7a[/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hizM}d-"C  
hIqUidJod  
  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; 6?M/7 1  
}1 qQ7}v  
  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; ya~;Of5  
$)ka1L"N  
  5、 添加代码,编译运行程序。 @uRJl$3  
sv% E5@  
三、程序代码 Ar >JQ@0  
zKJQel5  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 4pT^ *  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) d6tv4Cf  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ (,o@/ -o  
#if _MSC_VER > 1000 [UzacXt  
#pragma once c8mh#T bl  
#endif // _MSC_VER > 1000 3)W_^6>bM  
#ifndef __AFXWIN_H__ &)Qq%\EP4  
#error include 'stdafx.h' before including this file for PCH \f4rA?+f  
#endif {u y^Bui}  
#include "resource.h" // main symbols -|}?+W  
class CHookApp : public CWinApp B$2GEg]Ri  
{ kI(3Pf ].  
 public: J7",fb  
  CHookApp(); Wm-$l  
  // Overrides F!hjtIkPj  
  // ClassWizard generated virtual function overrides K5LJx-x*j  
  //{{AFX_VIRTUAL(CHookApp) H:hM(m0?q  
 public: yN`hW&K  
  virtual BOOL InitInstance(); xP>cQELot  
  virtual int ExitInstance(); b6k_u9m^E  
  //}}AFX_VIRTUAL Vv(buG  
  //{{AFX_MSG(CHookApp) Ot47.z  
  // NOTE - the ClassWizard will add and remove member functions here. deYv&=SPl  
  // DO NOT EDIT what you see in these blocks of generated code ! 0^V<,CAV  
  //}}AFX_MSG y[l{ UBue:  
  DECLARE_MESSAGE_MAP() (Ox&B+\v+v  
};  .GJbrz  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~x9J&*zxM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K:< Viz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E-Xz  
BOOL InitHotkey(); qgl-,3GY%N  
BOOL UnInit(); oh$"?N7n1  
#endif /dg?6XT/  
vzfMME17  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. PCaFG;}  
#include "stdafx.h" x*F- d2D  
#include "hook.h" ,_(=w.F   
#include <windowsx.h> AKjobA#  
#ifdef _DEBUG QChWy`x  
#define new DEBUG_NEW [I%e Ro[  
#undef THIS_FILE zP0<4E$M`  
static char THIS_FILE[] = __FILE__; =/a`X[9vI  
#endif l]&A5tz3  
#define MAX_KEY 100 yw+]S  
#define CTRLBIT 0x04 vA:ZR=)F  
#define ALTBIT 0x02 ~.^:?yCA  
#define SHIFTBIT 0x01 'q;MhnU+  
#pragma data_seg("shareddata") 8iD7K@  
HHOOK hHook =NULL; AaB1H7r-  
UINT nHookCount =0; r]xN&Ne5Q  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <`Fl Igo  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT $~:ZzZO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey H(n fHp.3  
static int KeyCount =0; <astIu Au  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P]}:E+E<.I  
#pragma data_seg() @ ^F{  
HINSTANCE hins; @6DKw;Q  
void VerifyWindow(); r%=a:GdAg  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Em Ut/]  
//{{AFX_MSG_MAP(CHookApp) -,/6 Wn'j  
// NOTE - the ClassWizard will add and remove mapping macros here. %2D'NZS  
// DO NOT EDIT what you see in these blocks of generated code! tq}sedYhee  
//}}AFX_MSG_MAP }vB{6E+h/w  
END_MESSAGE_MAP() `R (N3  
_+)OL-  
CHookApp::CHookApp() #+6j-^<_6  
{ dMjQV&  
 // TODO: add construction code here, 0hkYexX73  
 // Place all significant initialization in InitInstance 0[ "CP:u  
} RjP]8tH&  
|]q{ qsy  
CHookApp theApp; ^o C>,%7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |uFb(kL[U  
{ Y=sv   
 BOOL bProcessed=FALSE; wb#[&2i  
 if(HC_ACTION==nCode) bSI*`Dc"!  
 { Bf^K?:r"V  
  if((lParam&0xc0000000)==0xc0000000){// Key up OBlQ   
   switch(wParam) ||cI~qg  
   { v%`k*n':  
    case VK_MENU: Xeis_  
     MaskBits&=~ALTBIT; er 1zSTkg  
     break; w"M!**bP  
    case VK_CONTROL: Wkb>JnPo  
     MaskBits&=~CTRLBIT; yoq-H+<  
     break; d\A7}_r*x  
    case VK_SHIFT: e5FF'~A%]  
     MaskBits&=~SHIFTBIT; VWXyN  
     break; fK@UlMC]7  
    default: //judge the key and send message Vfq-H/+  
     break; 7PfNPz<4+  
   } g p|G q  
   for(int index=0;index<MAX_KEY;index++){ A #pH$s  
    if(hCallWnd[index]==NULL) c0jTQMe4yl  
     continue; /NPx9cLW^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) rf^IJY[  
    { Bz,Xg-k+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %AT/g&M&1#  
     bProcessed=TRUE; p*zTuB~e<  
    } ==KDr 0|G  
   } 8&x&Ou$("V  
  } :W-xsw  
  else if((lParam&0xc000ffff)==1){ //Key down KxJDAP  
   switch(wParam) @O6 2} F  
   { iy8Ln,4z(  
    case VK_MENU: 0'5N[Bvp  
     MaskBits|=ALTBIT; *m&'6qsS  
     break; Fkqw #s(T  
    case VK_CONTROL: #; P-*P  
     MaskBits|=CTRLBIT; =ZV+*cCC=q  
     break; =jG."o  
    case VK_SHIFT: bI;u};v  
     MaskBits|=SHIFTBIT; uqBVKE  
     break; a|dn3R>vX  
    default: //judge the key and send message j3?@p5E(  
     break; 6%c]{eTd9  
   } K9RRY,JB  
   for(int index=0;index<MAX_KEY;index++) 8js1m55KT  
   { +I.{y  
    if(hCallWnd[index]==NULL) V1,4M_Z  
     continue; ? a*yK8S  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ){tT B  
    { 2-#&ktM%V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .g_Kab3?L  
     bProcessed=TRUE; #("E) P  
    } ,F|49i.K  
   } 2) Q/cH\g  
  } B1U7z1<  
  if(!bProcessed){ sdQ "[`~2R  
   for(int index=0;index<MAX_KEY;index++){ ph7]*W-  
    if(hCallWnd[index]==NULL) U]E~7C  
     continue; vri<R8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V$  MMK  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  (=Lx9-u  
   } 7a%)/ )<D  
  } m8* )@e  
 } I6FglVQ6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Nl1v*9_x  
}  0$l D  
<%Re!y@OL  
BOOL InitHotkey() e]{X62]  
{ ;dYpdy  
 if(hHook!=NULL){ 4o2 C=?@(  
  nHookCount++; {N$G|bm]u<  
  return TRUE; %+9Mr ami  
 } .HG0%Vp  
 else  g=:C/>g  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); |nj%G<  
  if(hHook!=NULL) *(x`cf;k  
   nHookCount++; kqA`d  
  return (hHook!=NULL); X Jy]d/  
} t <#Yr%a  
BOOL UnInit() @hWt.qO3s  
{ sT3O_20{  
 if(nHookCount>1){ R28h%KN  
  nHookCount--; ([ xYOxcp5  
  return TRUE; DP*[t8  
 } PhM3?$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); C;;dCsiV5  
 if(unhooked==TRUE){ ?!-2G  
  nHookCount=0; f?_H02j`/E  
  hHook=NULL; e2%Y8ZJG.  
 } NQ%lwE~  
 return unhooked; O&irgc!  
} jzu1>*ok  
:\48=>  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) z.pP~he  
{ r/fLm8+  
 BOOL bAdded=FALSE; Ohnd:8E  
 for(int index=0;index<MAX_KEY;index++){ ^'C1VQ%  
  if(hCallWnd[index]==0){ BxO8oKe  
   hCallWnd[index]=hWnd; BfIGw  
   HotKey[index]=cKey; qV.*sdS>  
   HotKeyMask[index]=cMask; (~N &ov  
   bAdded=TRUE; H{`S/>)[   
   KeyCount++; k| nv[xY0  
   break; Fmk, "qs  
  } 'cT R<LVo  
 } QkwBw^'_5  
 return bAdded; +^!&-g@(  
} ~k4S~!(U0  
U*=ebZno  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) sUcx;<|BC  
{ ,Rk;*MEMJ  
 BOOL bRemoved=FALSE; `$7j:<c=  
 for(int index=0;index<MAX_KEY;index++){ 0S;H`w_S  
  if(hCallWnd[index]==hWnd){ Y: oL  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @%fNB,H`  
    hCallWnd[index]=NULL; frk(2C8T  
    HotKey[index]=0; kc\^xq~  
    HotKeyMask[index]=0; )&<BQIv9/  
    bRemoved=TRUE; _1 f!9ghT\  
    KeyCount--; 6+e@)[l.zc  
    break; sME3s-  
   } |#Bz&T  
  } $uF} GP_)  
 } NSUw7hnWvz  
 return bRemoved; ^i2W=A'P  
} b'4{l[3~nl  
gh|TlvnA  
void VerifyWindow() 5\V>Sj(  
{ oEd+  
 for(int i=0;i<MAX_KEY;i++){ (\>3FwFHW|  
  if(hCallWnd!=NULL){ htj:Z:C`  
   if(!IsWindow(hCallWnd)){ MJd!J ]E6  
    hCallWnd=NULL; HP^<2?K  
    HotKey=0; _$]3&P  
    HotKeyMask=0; F0wW3+G  
    KeyCount--; HJ!!"  
   } 29nMm>P.e  
  } bZ#KfR  
 } .E 9$j<SP-  
} cm8co  
Y=i_2R2e2  
BOOL CHookApp::InitInstance() pxI[/vS N  
{ 4}Y? :R  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); -UWyBM3c@  
 hins=AfxGetInstanceHandle(); 2J Wp5  
 InitHotkey(); r3Kx  
 return CWinApp::InitInstance(); hXD`OlX  
} vl!o^_70(  
|RBL5,t^  
int CHookApp::ExitInstance() uF{l`|b'  
{ mqBX1D`e2  
 VerifyWindow(); a *bc#!e  
 UnInit(); BwYR"  
 return CWinApp::ExitInstance(); {qm5H7sL  
} Bnz}:te}  
Va4AE)[/*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file c],Zw  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ,D.@6 bJW  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >J,IxRGi  
#if _MSC_VER > 1000 'N&s$XB,  
#pragma once uZP( -}  
#endif // _MSC_VER > 1000 ;p"#ZS7  
:2lM7|@/  
class CCaptureDlg : public CDialog Q@s G6 iz  
{ IFXnGDG$  
 // Construction .4!wp&  
 public: R_IT${O  
  BOOL bTray; 0a+U >S#  
  BOOL bRegistered; >qdRqy)DC  
  BOOL RegisterHotkey(); TrVQ]9;jWk  
  UCHAR cKey; #b1/2=PA  
  UCHAR cMask; $cGV)[KWp@  
  void DeleteIcon(); ]Gl5Qf:+z  
  void AddIcon(); gT|&tTS1@  
  UINT nCount; G)=+Nt\ *  
  void SaveBmp(); WhL"-f  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Lf,C5 0  
  // Dialog Data pS!N<;OWr  
  //{{AFX_DATA(CCaptureDlg) &RlYw#*1.  
  enum { IDD = IDD_CAPTURE_DIALOG }; jG^OF5.  
  CComboBox m_Key; XE|"n  
  BOOL m_bControl; Uc j>gc=  
  BOOL m_bAlt; A:?w1"7gT  
  BOOL m_bShift; AH ]L C6-  
  CString m_Path; *L5L.: Ze  
  CString m_Number; &^ =Y76  
  //}}AFX_DATA c`V~?]I>  
  // ClassWizard generated virtual function overrides <t&Qa~mA  
  //{{AFX_VIRTUAL(CCaptureDlg) zIA)se Js  
 public: B'e@RhU;  
  virtual BOOL PreTranslateMessage(MSG* pMsg); VaW^;d#  
 protected: 0j!xv(1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _o T+x%i  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [}=a6Q>)  
  //}}AFX_VIRTUAL aX2N Qq>s  
  // Implementation 95E #  
 protected: 0v,fY2$c  
  HICON m_hIcon; v5 @9  
  // Generated message map functions M>Q3;s  
  //{{AFX_MSG(CCaptureDlg) 5WA:gygB&  
  virtual BOOL OnInitDialog(); ?t/G@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *10qP?0H  
  afx_msg void OnPaint(); 4TTrHs  
  afx_msg HCURSOR OnQueryDragIcon(); H _JE)a:+  
  virtual void OnCancel(); .EReYZO  
  afx_msg void OnAbout(); 2^=8~I!n&  
  afx_msg void OnBrowse(); {r~=mQ  
  afx_msg void OnChange(); AmZW=n2^  
 //}}AFX_MSG lGt:.p{NG  
 DECLARE_MESSAGE_MAP() D59q/@  
}; ${rWDZ0Z  
#endif ORM3o ucP  
;.Ld6JRunw  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :7i x`C2  
#include "stdafx.h" '"+Gn52#  
#include "Capture.h" $@vB<(sk  
#include "CaptureDlg.h" OFBEJacy  
#include <windowsx.h> l=t/"M=  
#pragma comment(lib,"hook.lib") j sD]v)LB  
#ifdef _DEBUG &Z3%UOY  
#define new DEBUG_NEW ;B;@MD,B  
#undef THIS_FILE xC9{hXg!  
static char THIS_FILE[] = __FILE__; omGzyuPF  
#endif 5JEOLPS  
#define IDM_SHELL WM_USER+1 lXF7)H&T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); =)G]\W)m  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~]#-S20  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ^eyVEN  
class CAboutDlg : public CDialog /E2P  
{ ]l C2YD}  
 public: 3~7!=s\v  
  CAboutDlg(); R?;mu^B  
  // Dialog Data P(FlU]q  
  //{{AFX_DATA(CAboutDlg) 4:S]n19nq  
  enum { IDD = IDD_ABOUTBOX }; #t;]s<  
  //}}AFX_DATA kYWnaY ^F  
  // ClassWizard generated virtual function overrides \<(EV,m2  
  //{{AFX_VIRTUAL(CAboutDlg) x`FTy&g  
 protected: .%)uCLZr$  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @C!&lrf3  
  //}}AFX_VIRTUAL #rF`Hk:  
  // Implementation BgD3P.;[  
 protected: %gs?~Xl)]  
  //{{AFX_MSG(CAboutDlg) y2#"\5dC  
  //}}AFX_MSG b9#(I~}  
  DECLARE_MESSAGE_MAP() S9r?= K  
}; {aq)Y>o5:T  
']>9 /r#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) dt@c,McN|Q  
{ {d*OJ/4  
 //{{AFX_DATA_INIT(CAboutDlg) OJ"./*H  
 //}}AFX_DATA_INIT 37kVJQcA1  
} LEeA ,Y  
Z'j[N4%BK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) j`"!G*Vh  
{ hrq% {!Z  
 CDialog::DoDataExchange(pDX); EnlAgL']|  
 //{{AFX_DATA_MAP(CAboutDlg) lct  
 //}}AFX_DATA_MAP KpYezdPF)  
} g hmn3  
.4R.$`z4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (E)hEQ@8  
 //{{AFX_MSG_MAP(CAboutDlg) _J!&R:]$  
 // No message handlers hHmm(~5gR  
 //}}AFX_MSG_MAP "FA. T7G  
END_MESSAGE_MAP() YPI,u7-  
xl`AiO `K  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 3: WEODV2  
: CDialog(CCaptureDlg::IDD, pParent) GW'v\O  
{ {R-o8N  
 //{{AFX_DATA_INIT(CCaptureDlg)  19]19_-  
  m_bControl = FALSE; 3.?be.cq  
  m_bAlt = FALSE; ws5Ue4g|  
  m_bShift = FALSE; 5 | ,b  
  m_Path = _T("c:\\"); kMurNA=  
  m_Number = _T("0 picture captured."); ~qeFSU(  
  nCount=0; <^Vj1s  
  bRegistered=FALSE; 96<oX:#  
  bTray=FALSE; p>+9pxx~U  
 //}}AFX_DATA_INIT lTqlQ<`V  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Y2QX<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); @9KW ]7  
} S Dil\x  
}' AY#g  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `8W HVC$  
{ uStAZ ~b\  
 CDialog::DoDataExchange(pDX); z``wqK  
 //{{AFX_DATA_MAP(CCaptureDlg) ]5S`y{j1  
  DDX_Control(pDX, IDC_KEY, m_Key); \\<=J[R.M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); T8z?_ *k  
  DDX_Check(pDX, IDC_ALT, m_bAlt); I_v}}h{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); *"8Ls0!  
  DDX_Text(pDX, IDC_PATH, m_Path); {owuYVm  
  DDX_Text(pDX, IDC_NUMBER, m_Number); (^ EuF]  
 //}}AFX_DATA_MAP 5\bGCf  
} `9K5 ;]  
m*1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) hrJ(][8  
//{{AFX_MSG_MAP(CCaptureDlg) t<c7%i#Od  
 ON_WM_SYSCOMMAND() 3ouy-SQ  
 ON_WM_PAINT() h+Lpj^<2a  
 ON_WM_QUERYDRAGICON() N,B!D~@  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) k:7Gb7\  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4n.JRR&;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &tbAXU5$  
//}}AFX_MSG_MAP CN` ~DD{  
END_MESSAGE_MAP() 2aR9vmR  
QSzht$ 8  
BOOL CCaptureDlg::OnInitDialog() }UcdkKq  
{ "] 2^O  
 CDialog::OnInitDialog(); 2Y9u9;ah  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bLWY Tj  
 ASSERT(IDM_ABOUTBOX < 0xF000); #?\(l%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ->OVNmCB`+  
 if (pSysMenu != NULL) :!cK?H$+  
 { ]5@n`;&#.  
  CString strAboutMenu; 1D)0\#><  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,K@[+ R!  
  if (!strAboutMenu.IsEmpty()) pdFO!A_t  
  { >h:'Z*9  
   pSysMenu->AppendMenu(MF_SEPARATOR); -B/'ArOo]  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); K:XP;#OsP  
  } 6DU(KYN  
 } bbjEQby  
 SetIcon(m_hIcon, TRUE); // Set big icon %MGt3)  
 SetIcon(m_hIcon, FALSE); // Set small icon Nw9:Gi  
 m_Key.SetCurSel(0); }8YY8|]LI  
 RegisterHotkey(); $"( 15U  
 CMenu* pMenu=GetSystemMenu(FALSE); {A< 961  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); yFeFI@Hp 3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); OXp N8Dh5  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V'RbTFb9Z  
 return TRUE; // return TRUE unless you set the focus to a control NNr6~m)3v  
} qAd=i0{N  
31 <0Nw;l  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) .9Cy<z  
{ )HI\T];  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $aU.M3  
 { du ~V=%9  
  CAboutDlg dlgAbout; V'>Plb.A  
  dlgAbout.DoModal(); *aS+XnT/  
 } M:oM(K+  
 else `9^+KK"  
 { "P|n'Mx  
  CDialog::OnSysCommand(nID, lParam); 7T6Zlp  
 } }wp/,\_ >  
} }[lP^Qs  
A/:_uqm4  
void CCaptureDlg::OnPaint() _()1 "5{  
{ :Cx|(+T  
 if (IsIconic()) <)!,$]S  
 { + a nsN~3  
  CPaintDC dc(this); // device context for painting VJTO:}Q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ;/Z-|+!IJt  
  // Center icon in client rectangle `) cH(Rj  
  int cxIcon = GetSystemMetrics(SM_CXICON); Cy/VH"G=  
  int cyIcon = GetSystemMetrics(SM_CYICON); u;t~ z  
  CRect rect; d8agM/F*/  
  GetClientRect(&rect); %1jcY0zEQ  
  int x = (rect.Width() - cxIcon + 1) / 2; JttDRNZAU  
  int y = (rect.Height() - cyIcon + 1) / 2; Xj{fM\,"9  
  // Draw the icon E X'PRNB,  
  dc.DrawIcon(x, y, m_hIcon); o<3$|`S&  
 } "OwVCym?  
 else YI7M%B9Lj  
 { 1d FuoX  
  CDialog::OnPaint(); +e2:?d@  
 } 9`N5$;NzY  
} 0mUVa=)D  
8Vj'&UY  
HCURSOR CCaptureDlg::OnQueryDragIcon() _9 '_w&  
{ 3BCD0 %8  
 return (HCURSOR) m_hIcon; ;9h;oB@  
} 51y"#\7  
I-r+1gty  
void CCaptureDlg::OnCancel() Mhti  
{ 7CuZ7!>$  
 if(bTray) egG<"e*W}N  
  DeleteIcon(); HrsG^x  
  CDialog::OnCancel(); xIa7F$R 0  
} 37jxl+  
9>9EZ?4m  
void CCaptureDlg::OnAbout() io+V4m  
{ RM `qC  
 CAboutDlg dlg; |SjRss:i+  
 dlg.DoModal(); ;50&s .gZ  
} Is7BJ f  
]1<GZ`  
void CCaptureDlg::OnBrowse() ed q,:  
{ u>"0 >U  
 CString str; sg^|dS{3D  
 BROWSEINFO bi; 8;DDCop 8L  
 char name[MAX_PATH]; }Rw,4  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); E(PBV  
 bi.hwndOwner=GetSafeHwnd(); qtZ? kJ  
 bi.pszDisplayName=name; rYr*D[m]  
 bi.lpszTitle="Select folder"; GcdJf/k  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Y!CUUWM  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); !&rd#ZBn  
 if(idl==NULL) ZKrLp8l\  
  return; (*9.GyK  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ?F AI@4  
 str.ReleaseBuffer(); ;Nj9,Va(t  
 m_Path=str; IQ I8 v  
 if(str.GetAt(str.GetLength()-1)!='\\') R{H[< s+n  
  m_Path+="\\"; 9aJIq{`E  
 UpdateData(FALSE); aZWj52  
} f_jhQ..g<g  
xmvE*q"9]  
void CCaptureDlg::SaveBmp() Mu? |<#s  
{ hWT jN  
 CDC dc; lhGJ/By- -  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =n5'~1?X?  
 CBitmap bm; :u14_^  
 int Width=GetSystemMetrics(SM_CXSCREEN); {rUg,y{v  
 int Height=GetSystemMetrics(SM_CYSCREEN); A I.(}W4]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); }uZs)UQ|$  
 CDC tdc; Y &C b  
 tdc.CreateCompatibleDC(&dc); Cq\XLh `  
 CBitmap*pOld=tdc.SelectObject(&bm); ?;ok9Y  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gw]%: WeH  
 tdc.SelectObject(pOld); _p-e)J$7  
 BITMAP btm; l_^SU8i57  
 bm.GetBitmap(&btm); 3f[Yk# "  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; |58HPW9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vk92j?  
 BITMAPINFOHEADER bih; Ktq4b%{  
 bih.biBitCount=btm.bmBitsPixel; 4dX{an]Cz  
 bih.biClrImportant=0; f+h\RE=BGt  
 bih.biClrUsed=0; }KI/fh  
 bih.biCompression=0; R~\R>\  
 bih.biHeight=btm.bmHeight; ,vR?iNd:q[  
 bih.biPlanes=1; +OE!Uqnt  
 bih.biSize=sizeof(BITMAPINFOHEADER); lG7PM^Eb  
 bih.biSizeImage=size; X-c|jn7  
 bih.biWidth=btm.bmWidth; 'ToE Y3  
 bih.biXPelsPerMeter=0; D.K""*ula  
 bih.biYPelsPerMeter=0; 7~Y\qJ4b  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); >JyS@j}  
 static int filecount=0; XX8HSw!w  
 CString name; }L\;W:0  
 name.Format("pict%04d.bmp",filecount++); ytZo0pad  
 name=m_Path+name; mmTpF]t ?`  
 BITMAPFILEHEADER bfh; e4S@ J/D  
 bfh.bfReserved1=bfh.bfReserved2=0; YM}a>o  
 bfh.bfType=((WORD)('M'<< 8)|'B'); tT}b_r7h(1  
 bfh.bfSize=54+size; mZ+!8$1X  
 bfh.bfOffBits=54; ABWn49c.  
 CFile bf; *w+'I*QSt~  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }[AaI #  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); nip6|dN  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); uvId],dQ5  
  bf.WriteHuge(lpData,size);  {^N,=m\  
  bf.Close(); gHg=G+Q@  
  nCount++; yw^Pok5.  
 } #Rw!a#CX.  
 GlobalFreePtr(lpData); b] 5weS-<  
 if(nCount==1) a(gXvgrf[  
  m_Number.Format("%d picture captured.",nCount); IdWFG?b3  
 else `9p;LZC1K  
  m_Number.Format("%d pictures captured.",nCount); Wr\A ->+  
  UpdateData(FALSE); yK:b $S  
} r1 [Jo|4vo  
~myY-nEY  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V82N8-l  
{ </jTWc'}  
 if(pMsg -> message == WM_KEYDOWN) IkJ-*vI6  
 { pu6@X7W"  
  if(pMsg -> wParam == VK_ESCAPE) 59M\uVWR  
   return TRUE; o0F&,|'  
  if(pMsg -> wParam == VK_RETURN) 5Ls ][l7  
   return TRUE; '@,M 'H{  
 } aqN6.t  
 return CDialog::PreTranslateMessage(pMsg); F>[T)t{m=  
} h7F5-~SpD  
 F'9#dR?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {Z(kzJwN  
{ FkY <I]F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ k^*S3#"  
  SaveBmp(); ZA6)@Mn  
  return FALSE; aLt2fB1)  
} xy[aZr  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ $irF  
 CMenu pop; cCbZ*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); F!&$Z .  
 CMenu*pMenu=pop.GetSubMenu(0); Vo8gLX]a  
 pMenu->SetDefaultItem(ID_EXITICON); \*5${[  
 CPoint pt; 0 pPSg9  
 GetCursorPos(&pt); j NkobJ1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); {>n\B~*,"C  
 if(id==ID_EXITICON) zX}t1:nc  
  DeleteIcon(); 6#(==}Sm+  
 else if(id==ID_EXIT) sA!$}W  
  OnCancel(); Eohv P[i  
 return FALSE; 'j(F=9)  
} fuF!3Q  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); T?HW=v_a  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) q1?}G5a ?  
 AddIcon(); /Xk-xg+U  
 return res; ;Bwg'ThT  
} bfX yuv  
Z]qbLxJV  
void CCaptureDlg::AddIcon() T1#r>3c\  
{ z1S p'h$  
 NOTIFYICONDATA data; _T\cJcWf  
 data.cbSize=sizeof(NOTIFYICONDATA); ce:p*  
 CString tip; '|^x[8^  
 tip.LoadString(IDS_ICONTIP); ! 8*l U2  
 data.hIcon=GetIcon(0); ble[@VW|  
 data.hWnd=GetSafeHwnd(); y,s`[=CT  
 strcpy(data.szTip,tip); o&ETs)n|  
 data.uCallbackMessage=IDM_SHELL; ?!HU$>  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; uN8RG_Mb  
 data.uID=98; wl7 (|\-  
 Shell_NotifyIcon(NIM_ADD,&data); D$Eq~VQ  
 ShowWindow(SW_HIDE); z}w7X6&e  
 bTray=TRUE; O+OUcMa,  
} @8*lqV2  
^:~!@$*;6  
void CCaptureDlg::DeleteIcon() 2"6bz^>}  
{ QTC!vKM  
 NOTIFYICONDATA data; E.N  
 data.cbSize=sizeof(NOTIFYICONDATA); je8 5G`{DC  
 data.hWnd=GetSafeHwnd(); 76cLf~|d~  
 data.uID=98; * o{7 a$V  
 Shell_NotifyIcon(NIM_DELETE,&data); qWM+!f  
 ShowWindow(SW_SHOW); %'OY  
 SetForegroundWindow(); Kf1NMin7  
 ShowWindow(SW_SHOWNORMAL); Z\3~7Ek2m  
 bTray=FALSE; DS=$* Trk  
} nvQTJ4,,  
=M=v; ,I-  
void CCaptureDlg::OnChange() &-Ylj  
{ lg +>.^7k  
 RegisterHotkey(); Q_>W!)p Gz  
} sGa}Cf;H@g  
MX iQWg$  
BOOL CCaptureDlg::RegisterHotkey() CEW1T_1U<\  
{ |j~l%d*<w  
 UpdateData(); ?N^1v&Q  
 UCHAR mask=0; mv 7W03  
 UCHAR key=0; ;y_]w6|n  
 if(m_bControl) McpQ7\*h  
  mask|=4; z]7/Gc,j  
 if(m_bAlt) hd6O+i Y4  
  mask|=2; iX[g  
 if(m_bShift) te4=  
  mask|=1; d f!i}L  
  key=Key_Table[m_Key.GetCurSel()]; $<yhEvv  
 if(bRegistered){ /,`OF/%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7[PEiAI  
  bRegistered=FALSE; rr,w/[  
 } `/^ _W <  
 cMask=mask; SL-;h#-y 4  
 cKey=key; C]p@7"l  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); xv&h>GOg  
 return bRegistered; wZs 2 aa  
} AJm$(3?/D  
)U=]HpuzI  
  四、小结 J ZkQ/vp(  
\ 'Va(}v  
  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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