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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: \1cay#X  
  J]yUjnQ[h  
  一、实现方法 9fj3q>Un,  
7g8}]\i+  
  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: +F.{:  
VNBf2Va  
#pragma data_seg("shareddata") %nk]zf..  
HHOOK hHook =NULL; //钩子句柄 sG[v vm  
UINT nHookCount =0; //挂接的程序数目 T2<?4^xN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {VtmQU? cJ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 epuN~T  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @E;'Ffo  
static int KeyCount =0; Tw *:Vw  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 I(tMw6C$:  
#pragma data_seg() VW:WB.K$  
Q>Voa&tYn  
  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。 .<%2ON_  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: \  {` `r  
G_vWwH4XtL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR >-J%=P  
cKey,UCHAR cMask) _;L%? -2c  
{ QVLv}w`O  
 BOOL bAdded=FALSE; z*n  
 for(int index=0;index<MAX_KEY;index++){ Yef=HSzo  
  if(hCallWnd[index]==0){ %Xc50n2Z  
   hCallWnd[index]=hWnd; sQUJ]h  
   HotKey[index]=cKey; qWX%[i%  
   HotKeyMask[index]=cMask; 7iMBDkb7  
   bAdded=TRUE; nX~Qt%  
   KeyCount++; ntR@[)K  
   break; _/(DEF+G  
  } ,' VT75  
 } g@0<`g  
 return bAdded; HY-7{irR~  
} ZeM~13[  
//删除热键 [d 30mVM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }MQNzaXY^  
{ ere h!  
 BOOL bRemoved=FALSE; T'_#Dwmj*  
 for(int index=0;index<MAX_KEY;index++){ =h5&:?X  
  if(hCallWnd[index]==hWnd){ KYa}k0tVAp  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Q+@/.qJ  
    hCallWnd[index]=NULL; `W>cA64 o  
    HotKey[index]=0; zntvKOIh  
    HotKeyMask[index]=0; .)=T1^[hI  
    bRemoved=TRUE; jB) RvvMU5  
    KeyCount--; &U*MLf83`  
    break; a7$-gW"Z(,  
   } [bM$n m  
  } ,w-=8>5lrj  
 } F{*{f =E!B  
 return bRemoved; "#}Uh  
} DBTeV-G9~R  
OM,Dy&Y  
^97u0K3$  
  DLL中的钩子函数如下: ^4MRG6G  
Q /D?U[G  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TwPp Z@  
{ D)shWJRlvW  
 BOOL bProcessed=FALSE; )/4eT\=  
 if(HC_ACTION==nCode) a(.q=W  
 { 6sceymq  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 p+x}$&<|  
   switch(wParam) 6=N!()s  
   {  oF'_x,0  
    case VK_MENU: pQ~Y7  
     MaskBits&=~ALTBIT; @M( hyS&on  
     break; s Zn@ye^  
    case VK_CONTROL: @S?`!=M  
     MaskBits&=~CTRLBIT; Q9T/@FX  
     break; $ljzw@k  
    case VK_SHIFT: Nm {|  
     MaskBits&=~SHIFTBIT; {ovt 6C  
     break; b'AA*v,b  
    default: //judge the key and send message 7Eb | AR  
     break; !O )je>A  
   } r? 9D/|`  
   for(int index=0;index<MAX_KEY;index++){ ?,XrZRF  
    if(hCallWnd[index]==NULL) (:Y0^  
     continue; \B/!}Tn;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zX]4DLl,  
    { 813t=A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Rtywi}VV2  
     bProcessed=TRUE; r4MPs-}oF  
    } ~ eNKu  
   } Q*jNJ^IW  
  } V2B@Lq"9`  
  else if((lParam&0xc000ffff)==1){ //有键按下 kB#;s  
   switch(wParam) %*bGW'Cw  
   { 3M^s EaUI  
    case VK_MENU: P~}Yj@2  
     MaskBits|=ALTBIT;  " fXs!  
     break; g9~QNA  
    case VK_CONTROL: >DM^/EAG{  
     MaskBits|=CTRLBIT; iQd,xr  
     break; t,w'w_C  
    case VK_SHIFT: bU$f4J  
     MaskBits|=SHIFTBIT; e^=b#!}-5:  
     break; 3g79/ w  
    default: //judge the key and send message m=[3"X3W1V  
     break; _-=yD@;[D  
   } _^ZBSx09)  
   for(int index=0;index<MAX_KEY;index++){ bVxbQ$  
    if(hCallWnd[index]==NULL) !kW~s_gUb*  
     continue; aM5Hp>'nI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L l$,"}0T  
    { Vq&}i~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Cl>|*h+m  
     bProcessed=TRUE; zp'Vn7  
    } qV{iUtYt  
   } g:oB j6$ q  
  } `g}po%k  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 @|2sF  
   for(int index=0;index<MAX_KEY;index++){ '"m-kor  
    if(hCallWnd[index]==NULL) fK/|0@B8  
     continue; >,6%Y3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zdfruzl&`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); T)#e=WcP]  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 b3NEYn  
   } .;J6)h  
  } vu@@!cT6e  
 } oUd R,;h9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); )BeB xo7lv  
} jR[b7s  
Ir6(EIwx0  
  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: 7lUnqX.  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ()MUyW"S#`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u>\u}c  
bHRRgR`,  
  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: dKpUw9C#/  
xLShMv}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +\x}1bNS%j  
{ X..<U}e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {>Yna"p  
 { DCP B9:u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分  9dCf@5]  
  SaveBmp(); eWGaGRem  
  return FALSE; ET0^_yk  
 } \o}=ob  
 …… //其它处理及默认处理 =/m$ayG  
} fB= j51Lw  
4^GIQEjx  
"1wjh=@z  
  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。 .b|!FWHNS  
q[TGEgG  
  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。 D KRF#*[=d  
i%GNm D  
  二、编程步骤 qFE(H1hy  
WRqpQEY  
  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"; N{&Hq4^c  
sl_f+h0  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; TcpaZ 'x  
G`r/ tesW  
  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; K''2Jfm  
 yJGnN g  
  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; "Z]z9(  
4?33t] "  
  5、 添加代码,编译运行程序。 HSj=g}r  
Gp0yRT.  
三、程序代码 cT|aQM@iW  
Ex+E66bE  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL EkpM'j=  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ` InBhU>  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ p~yGp] yJ9  
#if _MSC_VER > 1000 >@0U B@  
#pragma once 9jI5bi)  
#endif // _MSC_VER > 1000 ,5}")T["u  
#ifndef __AFXWIN_H__ E?(:9#02  
#error include 'stdafx.h' before including this file for PCH ~m3Tq.sYrY  
#endif D[0g0>K  
#include "resource.h" // main symbols U>hpYqf_  
class CHookApp : public CWinApp UO( ?EELm  
{ )v+\1  
 public: UT%?3}*u"  
  CHookApp(); .#{m1mr  
  // Overrides @MxB d,P  
  // ClassWizard generated virtual function overrides &PUn,9 Rm  
  //{{AFX_VIRTUAL(CHookApp) ?wVq5^ e  
 public: YP`/dX"4  
  virtual BOOL InitInstance(); iE#I^`^V  
  virtual int ExitInstance(); ;m~%57.;\  
  //}}AFX_VIRTUAL %9OVw #P  
  //{{AFX_MSG(CHookApp) cD'|zH]  
  // NOTE - the ClassWizard will add and remove member functions here. glomwny  
  // DO NOT EDIT what you see in these blocks of generated code ! 2CRgOFR  
  //}}AFX_MSG (9KiIRN   
  DECLARE_MESSAGE_MAP() ,56objaE  
}; `Y,<[ Lnr  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6& KcO:}-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \hD jZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xM_+vN *(  
BOOL InitHotkey(); Yan,Bt{YJ  
BOOL UnInit(); vw*,_f  
#endif -r%k)4_  
^=arKp,?5  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Vrt*,R&  
#include "stdafx.h" &~"e["gF=  
#include "hook.h" c JOT{  
#include <windowsx.h> ,HwOMoP7  
#ifdef _DEBUG !h70<Q^  
#define new DEBUG_NEW ozkmZ;  
#undef THIS_FILE 3M"eAK([  
static char THIS_FILE[] = __FILE__; j/, I)Za  
#endif 'RpX&g  
#define MAX_KEY 100 y eWB.M~X  
#define CTRLBIT 0x04  zt2#6v  
#define ALTBIT 0x02 -'uz%2 {  
#define SHIFTBIT 0x01 cd.|>  
#pragma data_seg("shareddata") IN?rPdY  
HHOOK hHook =NULL; -] `OaL!  
UINT nHookCount =0; n{=Nf|=  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >{eGSSG0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <xh";seL  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 78kT}kgW  
static int KeyCount =0; -DWnDku8=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift CD pLV:  
#pragma data_seg() k3UKGP1  
HINSTANCE hins; zh Vkn]z~*  
void VerifyWindow(); Qsg([K  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) j7qGZ"8ak  
//{{AFX_MSG_MAP(CHookApp) N*'d]P2P`J  
// NOTE - the ClassWizard will add and remove mapping macros here. @i(;}rx  
// DO NOT EDIT what you see in these blocks of generated code! {7^D!lis  
//}}AFX_MSG_MAP p9gX$-!pbG  
END_MESSAGE_MAP() ZDr&Alp)o  
K9c5HuGy  
CHookApp::CHookApp() u&r+ylbs I  
{ 6tN!]  
 // TODO: add construction code here, "f4atuuXa  
 // Place all significant initialization in InitInstance (tQ0-=z  
} ]dL#k>$0q  
a H *5(E]  
CHookApp theApp; 1? Im"  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -op(26:W<  
{ UgD&tD0fp  
 BOOL bProcessed=FALSE; RP%7M8V){B  
 if(HC_ACTION==nCode) THmmf_w@  
 { Cn.x:I@r  
  if((lParam&0xc0000000)==0xc0000000){// Key up :ywm4)  
   switch(wParam) sW0<f& 3  
   { '\R/-.  
    case VK_MENU: jbTsrj"g  
     MaskBits&=~ALTBIT; OFn#C!  
     break; Bn5$TiTcl  
    case VK_CONTROL: J'@`+veE  
     MaskBits&=~CTRLBIT; ,rWej;CzN  
     break; ,XYtoZa  
    case VK_SHIFT: 2!";?E  
     MaskBits&=~SHIFTBIT; "U*6?]f  
     break; lH"4"r  
    default: //judge the key and send message #_'| TT>p#  
     break; '<Jqp7$dL  
   } aUbmEHFTV  
   for(int index=0;index<MAX_KEY;index++){ *V?p&/>MT  
    if(hCallWnd[index]==NULL) 1Ts$kdO  
     continue; \kG;T=H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?K= X[  
    { BL H~`N3U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wD5fm5r=  
     bProcessed=TRUE; |WsB0R  
    } tQ Ia6c4|  
   } yc.9CTxx  
  } 18o5Gs;yx  
  else if((lParam&0xc000ffff)==1){ //Key down 'L8B"5|>  
   switch(wParam) b>f{o_  
   { ok(dCAKP  
    case VK_MENU: qORRpWyx&  
     MaskBits|=ALTBIT; Mc<O ~  
     break; ObSRd$M  
    case VK_CONTROL: A3Oe=rB  
     MaskBits|=CTRLBIT; 8Lr&-w8J  
     break; ~JG\b?s  
    case VK_SHIFT: |yVveJ  
     MaskBits|=SHIFTBIT; >M^4p   
     break; {R}Kt;L:Ut  
    default: //judge the key and send message MT{ovDA].  
     break; @q+X:K5b  
   } 1[4 0\sM  
   for(int index=0;index<MAX_KEY;index++) h4tAaPcS+  
   { LuvRxmQ`  
    if(hCallWnd[index]==NULL) ' ;3#t(J;  
     continue; E{xcu9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /eY}0q%  
    { :bu]gj4e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^(~%'f  
     bProcessed=TRUE; M&^Iun  
    } 8 EUc 6  
   } pvYBhTz0  
  } 4Bk9d\z  
  if(!bProcessed){ C(}N*e1  
   for(int index=0;index<MAX_KEY;index++){ 'yNS(Bg=  
    if(hCallWnd[index]==NULL) Zx 5Ue#I  
     continue; t>JPK_b0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -;j ' =?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 69$gPY'3  
   } y8$I=  
  } L'r gCOJ<  
 } UB,:won  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); a}[ 1*_G  
} !30BR|K*  
T[ltOQw?Y  
BOOL InitHotkey() ^n9)rsb  
{ 90UZ\{">  
 if(hHook!=NULL){ CZw]@2/JuQ  
  nHookCount++; `XrF ,  
  return TRUE; oyq9XW~ D  
 } -d_7 q  
 else o e,yCdPs  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Xhp={p;  
  if(hHook!=NULL) ^~7ouA  
   nHookCount++; lky5%H  
  return (hHook!=NULL); ]4eIhj?  
} Eh&-b6:  
BOOL UnInit() T':} p2}w+  
{ PIM4c  
 if(nHookCount>1){ jP}Ix8vc=  
  nHookCount--; DE!c+s_g4  
  return TRUE; R?iC"s!  
 } >*Ctp +X@  
 BOOL unhooked = UnhookWindowsHookEx(hHook); [(*?  
 if(unhooked==TRUE){ Y>Fh<"A|$  
  nHookCount=0; jKr>Ig=$tA  
  hHook=NULL; Eal*){"<,?  
 } cjwc:3 CM  
 return unhooked; ,racmxnv  
} IIO-Jr  
RiiwsnjC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $d5}OI"g  
{ !![HR6"Q  
 BOOL bAdded=FALSE; &NH[b1NMr  
 for(int index=0;index<MAX_KEY;index++){ u#nM_UJe  
  if(hCallWnd[index]==0){ uUJH^pW  
   hCallWnd[index]=hWnd; /Suh&qw>  
   HotKey[index]=cKey; /Jf}~}JP  
   HotKeyMask[index]=cMask; >G}g=zy@  
   bAdded=TRUE; Jsf"h-)P  
   KeyCount++; $3]]<oH  
   break; SaFNPnk=  
  } 9i+.iuE%Bu  
 } ndHUQ$/(  
 return bAdded; |syvtS{  
} x Tf|u  
1<;G oC"  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) +d=w%r)  
{ 3GPGwzX |  
 BOOL bRemoved=FALSE; k\Z7Dg$\D  
 for(int index=0;index<MAX_KEY;index++){ :%>TM/E N  
  if(hCallWnd[index]==hWnd){ d8.A8<wUr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ~PyZh5x  
    hCallWnd[index]=NULL;  6h?)x  
    HotKey[index]=0; +;bP.[Z  
    HotKeyMask[index]=0; B3&C=*y  
    bRemoved=TRUE; {<Y\flj{@m  
    KeyCount--; r<5i  
    break; Y|cj&<o  
   } gN .n _!  
  } c' Q4Fzj0'  
 } uU/'oZ?  
 return bRemoved; E7  P'}  
} d~#:t~ $,  
J*4T| #0  
void VerifyWindow() A,4Z{f83  
{ -+y3~^EYm,  
 for(int i=0;i<MAX_KEY;i++){ t&Jrchk  
  if(hCallWnd!=NULL){ WSbD."p<  
   if(!IsWindow(hCallWnd)){ Wo{4*~f  
    hCallWnd=NULL; [Gc9 3PA7q  
    HotKey=0; z[WdJN{  
    HotKeyMask=0; /kAbGjp0  
    KeyCount--; [r^WS;9n  
   } ]JH Int  
  } } p `A>  
 } jIck!  
} S,f:nLT  
Xa$-Sx  
BOOL CHookApp::InitInstance() yOO@v6jO)  
{ ,"5][RsOn  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); RMlx[nsq  
 hins=AfxGetInstanceHandle(); LwcAF g|  
 InitHotkey(); E|y  
 return CWinApp::InitInstance(); h-6x! 6pm  
} v+C%t!dx  
M8${&&[;  
int CHookApp::ExitInstance() t8.^YTI  
{ Bdm05}c@u  
 VerifyWindow(); ak\[+wQ  
 UnInit(); rPK1#  
 return CWinApp::ExitInstance(); <xUX&J=;  
} NIG* }[}P  
L[tq@[(IJ  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file lX64IvG8+o  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) APyH.]mQ  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ EN5F*s@r  
#if _MSC_VER > 1000 g\pLQH  
#pragma once }pKKNZ`[  
#endif // _MSC_VER > 1000 R%6KxN)+@  
IQQ>0^Q~  
class CCaptureDlg : public CDialog ]v#T9QQN  
{ Bo0f`EC I  
 // Construction Z@0IvI  
 public: ZhFlR*EQ  
  BOOL bTray; X'p%K/-m  
  BOOL bRegistered; .V@3zzv\  
  BOOL RegisterHotkey(); WmuYHEU  
  UCHAR cKey; Bi7&yS5V  
  UCHAR cMask; QBjvbWoIG(  
  void DeleteIcon(); (Q"~bP{F  
  void AddIcon(); >cH}sNHy  
  UINT nCount; vf-8DB  
  void SaveBmp(); ]Xg7XY  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 7n7UL0Oc1  
  // Dialog Data ?@QcKQ@  
  //{{AFX_DATA(CCaptureDlg) 4A)_D{(SH  
  enum { IDD = IDD_CAPTURE_DIALOG }; Q+*@!s  
  CComboBox m_Key; KebC$g@W  
  BOOL m_bControl; A'n{K#  
  BOOL m_bAlt; 7MIrrhk  
  BOOL m_bShift; +iw4>0pi  
  CString m_Path; o\X|\nUk  
  CString m_Number; MH=Ld=i  
  //}}AFX_DATA ,zh_-2^X  
  // ClassWizard generated virtual function overrides T:g%b @  
  //{{AFX_VIRTUAL(CCaptureDlg) *d:$vaL  
 public: d(C5i8d  
  virtual BOOL PreTranslateMessage(MSG* pMsg); e6Kyu*  
 protected: QObHW[:F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5ljEh -  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V`}u:t7r  
  //}}AFX_VIRTUAL ))I[@D1b  
  // Implementation ak zKX}  
 protected: c]NZG n*  
  HICON m_hIcon; 1cD  
  // Generated message map functions JvYs6u  
  //{{AFX_MSG(CCaptureDlg) gnlU  
  virtual BOOL OnInitDialog(); ;&XC*R+  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); i<*W,D6  
  afx_msg void OnPaint(); 4jW <*jM  
  afx_msg HCURSOR OnQueryDragIcon(); KgXu x-q  
  virtual void OnCancel(); k0,]2R  
  afx_msg void OnAbout(); ;_m; :<  
  afx_msg void OnBrowse(); V!QC.D<  
  afx_msg void OnChange(); d'[q2y?6N  
 //}}AFX_MSG 8zQN[[#n  
 DECLARE_MESSAGE_MAP() o@ @|4 F  
}; ^M+aQg%  
#endif E+J+fi  
(?ZS 9&y}  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Tj6kCB  
#include "stdafx.h" Se>v|6  
#include "Capture.h" &3:<WU:U  
#include "CaptureDlg.h" =oTj3+7  
#include <windowsx.h> fDAT#nlyp  
#pragma comment(lib,"hook.lib") C)ic;!$Qhb  
#ifdef _DEBUG { }P~nP  
#define new DEBUG_NEW 1V-sibE  
#undef THIS_FILE B^C 5?  
static char THIS_FILE[] = __FILE__; mt4X  
#endif fni7HBV?  
#define IDM_SHELL WM_USER+1 szp.\CMz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sU/vXweky"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NMESGNa)z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9]:F!d/  
class CAboutDlg : public CDialog eQ<G Nvm  
{ .M0pb^M  
 public: bSa]={}L(  
  CAboutDlg(); <tdsUh:?&  
  // Dialog Data @#yl_r%  
  //{{AFX_DATA(CAboutDlg) ;WG%)^e  
  enum { IDD = IDD_ABOUTBOX }; Rg3g:TV9c  
  //}}AFX_DATA ynJ)6n7a  
  // ClassWizard generated virtual function overrides MJU*Sq  
  //{{AFX_VIRTUAL(CAboutDlg) 68~5Dx  
 protected: Zi<(>@z2  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DuIgFp  
  //}}AFX_VIRTUAL ~|{_Go{ Q  
  // Implementation py6O\` \  
 protected: gps.  
  //{{AFX_MSG(CAboutDlg) # ELYPp]6  
  //}}AFX_MSG %- Ga  ^[  
  DECLARE_MESSAGE_MAP() ps33&  
}; Aa^w{D  
0@&/W-VXg  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) zIr4!|X  
{ G6s3 \de#U  
 //{{AFX_DATA_INIT(CAboutDlg) |Rz}bsrZ  
 //}}AFX_DATA_INIT #I#_gjJkx  
} kb!W|l"PN  
%DKC/%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8F/zrPG  
{ |][PbN D  
 CDialog::DoDataExchange(pDX); A-u!{F  
 //{{AFX_DATA_MAP(CAboutDlg) g\H~Y@'{  
 //}}AFX_DATA_MAP 2Hk21y\  
} Z8Tb43?  
Ss:'H H4  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) gi+FL_8CzU  
 //{{AFX_MSG_MAP(CAboutDlg) !ZY1AhGZ  
 // No message handlers @]L$eOV_  
 //}}AFX_MSG_MAP |(uo@-U  
END_MESSAGE_MAP() V-18~+F~"a  
n!U1cB{  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <g64N  
: CDialog(CCaptureDlg::IDD, pParent) s\(@f4p  
{ -c#vWuLl  
 //{{AFX_DATA_INIT(CCaptureDlg) c_Iq!MH  
  m_bControl = FALSE; Y6 a9S`o  
  m_bAlt = FALSE; G6qFAepwi  
  m_bShift = FALSE; }S{VR(i`J  
  m_Path = _T("c:\\"); lYU?j|n  
  m_Number = _T("0 picture captured."); df/7u}>9  
  nCount=0; 5kCXy$"%  
  bRegistered=FALSE; nLR   
  bTray=FALSE; % @!hf!  
 //}}AFX_DATA_INIT >RrG&Wv59  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zr wzI+4  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); zuF]E+  
} lU`t~|>r+  
,M :j5  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <&HHo>rl  
{ ]+>Kl>@  
 CDialog::DoDataExchange(pDX); 0CI\Yd=  
 //{{AFX_DATA_MAP(CCaptureDlg) %K0Wm#)  
  DDX_Control(pDX, IDC_KEY, m_Key); WA5.qw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); #-l+c u{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); =[0| qGzg  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); q-S#[I+g  
  DDX_Text(pDX, IDC_PATH, m_Path); ]2_=(N\Kt  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /xd|mo)D  
 //}}AFX_DATA_MAP cDz^jC   
} !E^\)=E)P  
@ ZN@EOM$+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +ijxv  
//{{AFX_MSG_MAP(CCaptureDlg) \ *A!@T  
 ON_WM_SYSCOMMAND() T%E/k# )q  
 ON_WM_PAINT() 9ZDbZc  
 ON_WM_QUERYDRAGICON() [}5mi?v  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) E`|vu*l7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J^zB 5W,)  
 ON_BN_CLICKED(ID_CHANGE, OnChange) M]xfH*  
//}}AFX_MSG_MAP z~/e\  
END_MESSAGE_MAP() I(j$^DA.  
>|mZu)HIY;  
BOOL CCaptureDlg::OnInitDialog() 8Ep!  
{ 3teP6|K'g  
 CDialog::OnInitDialog(); HTSk40V  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); O"wo&5b_  
 ASSERT(IDM_ABOUTBOX < 0xF000); HIda%D  
 CMenu* pSysMenu = GetSystemMenu(FALSE); kpMo7n  
 if (pSysMenu != NULL) #!P>." .  
 { {D8yqO A}  
  CString strAboutMenu; Ged} qXn  
  strAboutMenu.LoadString(IDS_ABOUTBOX); #Fkp6`Q$x  
  if (!strAboutMenu.IsEmpty()) <&tdyAT?&  
  { znAo]F9=J"  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9}+X#ma.Nc  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 27MwZz  
  } F:AVik  
 } z Ece>=C  
 SetIcon(m_hIcon, TRUE); // Set big icon Lzx2An@R  
 SetIcon(m_hIcon, FALSE); // Set small icon T&j:gg  
 m_Key.SetCurSel(0); pk6<wAs*?#  
 RegisterHotkey(); cGlpJ)'-{  
 CMenu* pMenu=GetSystemMenu(FALSE); A.(e=;0bu  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); p[}~Z|(  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ao\Im(?  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 83VFBY2q  
 return TRUE; // return TRUE unless you set the focus to a control R`,|08E  
} .etG>tH  
yTf/]H]d  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) vi` VK&+r  
{ uvi&! )x  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) g"\J iBb5  
 { )!;20Po  
  CAboutDlg dlgAbout; N|/gwcKe  
  dlgAbout.DoModal(); E@-5L9eJ\  
 } *77Y$X##k  
 else q9c-UQB(!  
 { }/ Qj8l.  
  CDialog::OnSysCommand(nID, lParam); ]1M Z:]k  
 } 2SlI5+u  
} N$u: !  
1?G%&X@ X  
void CCaptureDlg::OnPaint() MjK<n[.  
{ 4~2 9,  
 if (IsIconic()) t_+owiF)M  
 { &w:0ad|  
  CPaintDC dc(this); // device context for painting 3mL(xpT.8z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); lHE \Z`  
  // Center icon in client rectangle R0K{wY58  
  int cxIcon = GetSystemMetrics(SM_CXICON); AEUR` .  
  int cyIcon = GetSystemMetrics(SM_CYICON); ZuKOscVS#T  
  CRect rect; &#OF,_6"m  
  GetClientRect(&rect); [MD"JW?4B  
  int x = (rect.Width() - cxIcon + 1) / 2; EA z>`~  
  int y = (rect.Height() - cyIcon + 1) / 2; U|aEyMU  
  // Draw the icon (-VH=,Md  
  dc.DrawIcon(x, y, m_hIcon); f`8?]@y{  
 } B;nIKZ  
 else B7sBO6Z$J  
 { 2'Raj'2S4  
  CDialog::OnPaint(); 8Nx fYA  
 } ]$Q@4=fb  
} I:1Pz|$`  
W*/2x8$d  
HCURSOR CCaptureDlg::OnQueryDragIcon() gLlA'`!  
{ n6 wx/:  
 return (HCURSOR) m_hIcon; y( UWh4?t  
} E:[!)UG|y  
!e+Sa{X  
void CCaptureDlg::OnCancel() M~)iiKw~MY  
{ %v UUx+  
 if(bTray) 8"rK  
  DeleteIcon(); -![{Zb@  
  CDialog::OnCancel(); V0n8fez b  
} $QwzL/a  
yZb})4.  
void CCaptureDlg::OnAbout() r]Lj@0F>8  
{ Oq(FV[N7t  
 CAboutDlg dlg; cQ3p|a `  
 dlg.DoModal(); ZgmK~iJ  
} TCi0]Y~a  
}%<cF i &  
void CCaptureDlg::OnBrowse() -s ^cy+jd  
{ 4b}'W}  
 CString str; NOf{Xx<#k  
 BROWSEINFO bi; "2 D{X  
 char name[MAX_PATH]; q(BRJ(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); b,47 EJ}  
 bi.hwndOwner=GetSafeHwnd(); 3h6,x0AG  
 bi.pszDisplayName=name; Equ%6x  
 bi.lpszTitle="Select folder"; TN/&^/  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /K;AbE  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); M&e=LV  
 if(idl==NULL) 21] K7  
  return; i%MR<M  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); DmZ_tuVI  
 str.ReleaseBuffer(); h]4qJ  
 m_Path=str; 9l,8:%X_  
 if(str.GetAt(str.GetLength()-1)!='\\') :u2tu60&MJ  
  m_Path+="\\"; 4-9cp=\PE  
 UpdateData(FALSE); "&\(:#L  
} \aN5:Yy  
BWr!K5w>i  
void CCaptureDlg::SaveBmp() B)dd6R>8  
{ |BO5<`&I  
 CDC dc; >b~Q%{1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); !Nbi&^k B  
 CBitmap bm; `.wgRUhFH;  
 int Width=GetSystemMetrics(SM_CXSCREEN); `:2np{  
 int Height=GetSystemMetrics(SM_CYSCREEN); kjr q;j:  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0|{":i_s  
 CDC tdc; I]~s{I(EK  
 tdc.CreateCompatibleDC(&dc); ncpA\E;ff^  
 CBitmap*pOld=tdc.SelectObject(&bm); T,B%iZgCh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); QRF:6bAxsL  
 tdc.SelectObject(pOld); X.rbJyKe  
 BITMAP btm; J+`gr_&  
 bm.GetBitmap(&btm); 5oOs.(m|*C  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; tq*{Hil>P`  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;cb='s  
 BITMAPINFOHEADER bih; BJqb'H jd  
 bih.biBitCount=btm.bmBitsPixel; |r4&@)  
 bih.biClrImportant=0; ,pW^>J  
 bih.biClrUsed=0; VotI5O $  
 bih.biCompression=0; \;+b1  
 bih.biHeight=btm.bmHeight; @Q:?,  
 bih.biPlanes=1; #Zn+-Ih  
 bih.biSize=sizeof(BITMAPINFOHEADER); .SBN^fq  
 bih.biSizeImage=size; dhuIVBp!!e  
 bih.biWidth=btm.bmWidth; uuy0fQQ8ti  
 bih.biXPelsPerMeter=0; - @KT#  
 bih.biYPelsPerMeter=0; j92+kq>Xd  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 3>^B%qg6  
 static int filecount=0; {s?hXB  
 CString name; avqJ[R  
 name.Format("pict%04d.bmp",filecount++); Xg}~\|n  
 name=m_Path+name; @d|]BqQ4jh  
 BITMAPFILEHEADER bfh; !DKl:8mx4  
 bfh.bfReserved1=bfh.bfReserved2=0; Y1BxRd?D  
 bfh.bfType=((WORD)('M'<< 8)|'B'); =g=Vv"B_  
 bfh.bfSize=54+size; 1+-F3ROP  
 bfh.bfOffBits=54; l%`~aVGJ  
 CFile bf; |~=4Z rcCP  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ UQtG<W]<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); myB!\ WY   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :m("oC@}  
  bf.WriteHuge(lpData,size); H$&P=\8n  
  bf.Close(); sB01 QVx47  
  nCount++; QFhQfn  
 } e XmYw^n  
 GlobalFreePtr(lpData); ^{g+HFTA@  
 if(nCount==1) |G)bnmi7  
  m_Number.Format("%d picture captured.",nCount); ;=8@@9  
 else &<C&(g{Z  
  m_Number.Format("%d pictures captured.",nCount); m h|HEkM  
  UpdateData(FALSE); fJY b)sN  
} B_%O6  
w_q =mKu  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 1$"wN z  
{ O[ ^zQA  
 if(pMsg -> message == WM_KEYDOWN) MO79FNH2\  
 { %5 <t3 H"  
  if(pMsg -> wParam == VK_ESCAPE) 2f 9%HX(5  
   return TRUE; &oDu$%dkT  
  if(pMsg -> wParam == VK_RETURN) %'dsb7n  
   return TRUE; q,j` _ R4  
 } lpefOnO[  
 return CDialog::PreTranslateMessage(pMsg); ,Lw '3  
} Uq2Qh@B  
&MP8.( u `  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~I%JVX%  
{ P"c7h7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ xCm`g {  
  SaveBmp(); AdRt\H<  
  return FALSE; |CjdmQ u  
} +@#-S  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 6r)qM)97  
 CMenu pop; 1;+(HB  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); q5~fU$ ,  
 CMenu*pMenu=pop.GetSubMenu(0); 1)M%]I4  
 pMenu->SetDefaultItem(ID_EXITICON); ]&L[]  
 CPoint pt; 3a,7lTUuB  
 GetCursorPos(&pt); hfQ^C6yR  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); wW^3/  
 if(id==ID_EXITICON) C#.d sl  
  DeleteIcon(); B4# gT  
 else if(id==ID_EXIT) Yc V*3`  
  OnCancel(); 6j~'>w(F  
 return FALSE; H3o Um1  
} 7ZgFCK,8m,  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); z^9df(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) $qhVow5~  
 AddIcon(); o=do L{ #  
 return res; &v_b7h  
} {I"d"'h  
SyR[G*djl  
void CCaptureDlg::AddIcon() $RV'DQO  
{ -ID!kZx  
 NOTIFYICONDATA data; n15lX,FI  
 data.cbSize=sizeof(NOTIFYICONDATA); C`C$i>X7^  
 CString tip; ]i:O+t/U  
 tip.LoadString(IDS_ICONTIP); C)Hb=  
 data.hIcon=GetIcon(0); ~r>N  
 data.hWnd=GetSafeHwnd(); 1)=sbFtS  
 strcpy(data.szTip,tip); orAEVEm  
 data.uCallbackMessage=IDM_SHELL; )`]} D[j  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; T WgI-xB  
 data.uID=98; "@E(}z'sM  
 Shell_NotifyIcon(NIM_ADD,&data); =nN&8vRH  
 ShowWindow(SW_HIDE); WqRg/  
 bTray=TRUE; :+|os"  
} D|!^8jHj  
zLLe3?8:  
void CCaptureDlg::DeleteIcon() _ ;_NM5  
{ s&zg!~@5b  
 NOTIFYICONDATA data; cwA+?:Ry}  
 data.cbSize=sizeof(NOTIFYICONDATA); p[-bu B]  
 data.hWnd=GetSafeHwnd(); EK}f-Xei  
 data.uID=98; DvvjIYB~  
 Shell_NotifyIcon(NIM_DELETE,&data); u-E*_% y  
 ShowWindow(SW_SHOW); KcX] g*wy  
 SetForegroundWindow(); @~<M_63  
 ShowWindow(SW_SHOWNORMAL); cLe659&  
 bTray=FALSE; kVe_2oQ_>  
} uia-w^F e  
&/A?*2  
void CCaptureDlg::OnChange() n,NKJt  
{ *.0#cP7 "  
 RegisterHotkey(); #x|h@(y|  
} NEh5    
u4[3JI>  
BOOL CCaptureDlg::RegisterHotkey() i<nUp1r(  
{ &U8W(NxN  
 UpdateData(); W.AN0N  
 UCHAR mask=0; g&"__~dS-F  
 UCHAR key=0; C/Dc1sj  
 if(m_bControl) 9*}?0J8  
  mask|=4; =-dk@s  
 if(m_bAlt) O)!MWmr  
  mask|=2; Ym*Ed[S  
 if(m_bShift) u%=M4|7  
  mask|=1; M&iA^Wrs  
  key=Key_Table[m_Key.GetCurSel()]; G#;$;  
 if(bRegistered){ ZO $}m?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t`X-jr)g  
  bRegistered=FALSE; lvz&7Zb  
 } 7:t *&$  
 cMask=mask; e'uI~%$NJL  
 cKey=key; ?gMxGH:B.&  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 6uf+,F  
 return bRegistered; e&(Di,%:  
} jz2W/EE`w  
QNH5Cq;Y  
  四、小结 tA2I_W Cl  
-\!"Kz/  
  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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