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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: art{PV4-  
  [C$ 0HW  
  一、实现方法  <CFu r  
*q RQN+%  
  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: {Fj`'0Xu;  
5j]%@]M$Z  
#pragma data_seg("shareddata") cnR>)9sX  
HHOOK hHook =NULL; //钩子句柄 z?PF9QL1  
UINT nHookCount =0; //挂接的程序数目 DxlX-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ;c`B '  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 QUt!fF@t  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey F}X_I  
static int KeyCount =0; Z]tz<YSkG  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 L|<Mtw  
#pragma data_seg() 5GKz@as8  
4T:ZEvdzf  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 n#*cVB81  
y.zW>Mfl  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: @bZb#,n]  
_/Hu'9432  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR V|7 c dX#H  
cKey,UCHAR cMask) {?8rvAj Y  
{ M<SZ7^9<  
 BOOL bAdded=FALSE; W+QI D/  
 for(int index=0;index<MAX_KEY;index++){ C<3An_Dy  
  if(hCallWnd[index]==0){ BsJClKp/  
   hCallWnd[index]=hWnd; ?IK[]=!  
   HotKey[index]=cKey; %EuSP0  
   HotKeyMask[index]=cMask; mwt3EV5  
   bAdded=TRUE; (j(6%U  
   KeyCount++; |K]tJi4fz  
   break; .m .v$(  
  } Hxjh P(  
 } %NvY~,  
 return bAdded; [|vd r.  
} 37VSE@Z+  
//删除热键 i]P]o)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Na4\)({  
{ 0VPa=AW  
 BOOL bRemoved=FALSE; +S$x}b'5q  
 for(int index=0;index<MAX_KEY;index++){ ]c08`  
  if(hCallWnd[index]==hWnd){ zJPzI{-w|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ \QVL%,.%M  
    hCallWnd[index]=NULL; 8{AzB8xp  
    HotKey[index]=0; 'Ag?#vB  
    HotKeyMask[index]=0; SO|$X  
    bRemoved=TRUE; p?5zwdX+`  
    KeyCount--; "_lSw3  
    break; O %OeYO69  
   } _T1|_9b  
  } ig6F!p  
 } qTG/7tn "  
 return bRemoved; yJ?6BLJi  
} ~x2azY2DP  
YM-,L-HMA  
Au9Rr3n  
  DLL中的钩子函数如下: aPRF  
V V<Zl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Z\n nVM=  
{ bO9X;} \6  
 BOOL bProcessed=FALSE; |(]XZ!{  
 if(HC_ACTION==nCode) Wh,p$|vL  
 { `rvS(p[s  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {q:6;yzxl  
   switch(wParam) uZCPxog  
   {  L+&$/1h]  
    case VK_MENU: zpJQ7hym  
     MaskBits&=~ALTBIT; F&^u1RYz  
     break; vLq_l4l  
    case VK_CONTROL: (<|,LagTuc  
     MaskBits&=~CTRLBIT; G#UO>i0jy  
     break; *~cq (PFQ  
    case VK_SHIFT: O.i.<VD7  
     MaskBits&=~SHIFTBIT; r+>gIX+Fl  
     break; 0`:0m/fsU  
    default: //judge the key and send message ^I7iEv  
     break; arm26YA-,  
   } 29:] cL(5  
   for(int index=0;index<MAX_KEY;index++){ o!:   
    if(hCallWnd[index]==NULL) umI@ej+D  
     continue; y-9Mm9J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 12.|Ed*72  
    { &=~Jw5WK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); f-^JI*hj  
     bProcessed=TRUE; }get e'I  
    } r[K%8Y8`  
   } W|4:3 c4  
  } X3@Uih}|  
  else if((lParam&0xc000ffff)==1){ //有键按下 ;O+= 6>W  
   switch(wParam) ]@0C1 r  
   { )1N~-VuT  
    case VK_MENU: y2KR^/LN|Y  
     MaskBits|=ALTBIT; 7*.nd  
     break; :>f}rq  
    case VK_CONTROL: /@ m]@  
     MaskBits|=CTRLBIT; -V7dSi  
     break; "\3C)Nz?  
    case VK_SHIFT: KSz;D+L \  
     MaskBits|=SHIFTBIT; 3s;^p,9 Y  
     break; *mby fu0q  
    default: //judge the key and send message ;?4EVZ#o  
     break; %py3fzg  
   } T,r?% G{XE  
   for(int index=0;index<MAX_KEY;index++){ shKTj5s?  
    if(hCallWnd[index]==NULL) $Y,y~4I  
     continue; h/k00hD60  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xPCRT*Pd  
    { T\q:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); A`71L V%  
     bProcessed=TRUE; >P@g].Q-  
    } a5cary Z"z  
   } r'8qZJgm  
  } HAwdu1$8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 5X&Y~w,poU  
   for(int index=0;index<MAX_KEY;index++){ 2u Zb2O  
    if(hCallWnd[index]==NULL) _0}u0fk  
     continue; Ogv9_ X8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) >e>%AMzo[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m~04I~8vk  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 F/V -@SF  
   } bI+/0X x  
  } @CMEmgk~  
 } "zj[v1K9-A  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T[Lz4;TRk5  
} [n4nnmM  
Wz%H?m:g#  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: galzk$D  
LY-,cXm&|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zG{P5@:.R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z^vfha  
qA0PGo  
  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: # ~Doz7~  
GXG 7P,p,  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9fm9xTL  
{ >v2/0>U  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) D%L^[|)c\s  
 { oz:"w nX  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 #/_{(P  
  SaveBmp(); P?p]sLrP  
  return FALSE; |M`'   
 } gFqF&t  
 …… //其它处理及默认处理 #N"m[$;QR  
} E5!vw@,  
\HXq~Y  
zZ6m`]{B9?  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 4_kY^"*#"  
}ZK%@b>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ,~q:rh+  
eR%\_;}7;  
  二、编程步骤 Qk? WX (`B  
4C/G &w&  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; d a<>a  
(n`] sbx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )(0if0D4  
`Fie'[F5,)  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; `JO>g=,4  
DQ(0:r  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 7Xx3s@  
n]df)a  
  5、 添加代码,编译运行程序。 "iTjiH)Q(  
<8(=Lv`)q  
三、程序代码 4GbfA .u  
Y?TS,   
///////////////////////////////////// Hook.h : main header file for the HOOK DLL a*-9n-U@[k  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "4\k1H"_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ^D<CoxG  
#if _MSC_VER > 1000 L&c & <+0T  
#pragma once :.4O Hp1  
#endif // _MSC_VER > 1000 KCO.8=y3  
#ifndef __AFXWIN_H__ D(l,Z  
#error include 'stdafx.h' before including this file for PCH 6@TU9AZS `  
#endif A|GtF3:G  
#include "resource.h" // main symbols ]!ox2m_U  
class CHookApp : public CWinApp VwpC UW  
{ ?r KbL^2  
 public: 10fxK  
  CHookApp(); d7Vp^^}(  
  // Overrides U$mDAi$  
  // ClassWizard generated virtual function overrides hw,nA2w\  
  //{{AFX_VIRTUAL(CHookApp) ]XU4nNi  
 public: HdN5zl,q  
  virtual BOOL InitInstance(); |Fe[RGi+8  
  virtual int ExitInstance(); y_X jY  
  //}}AFX_VIRTUAL aX`uF<c9  
  //{{AFX_MSG(CHookApp) V:w%5'^3  
  // NOTE - the ClassWizard will add and remove member functions here. ?TeozhUY  
  // DO NOT EDIT what you see in these blocks of generated code ! b3EGtC}^  
  //}}AFX_MSG 'y\Je7  
  DECLARE_MESSAGE_MAP() g'KxjjYT,  
}; s]% C z\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); f[1cN`|z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E/g"}yR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s> m2qSu  
BOOL InitHotkey(); `Jk0jj6Z  
BOOL UnInit(); 0u1ZU4+EC  
#endif QuqznYSY{  
dpTsTU!\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. arDl2T,igF  
#include "stdafx.h" g!R7CRt%  
#include "hook.h" H,]8[ qT<  
#include <windowsx.h> 8'u9R~})   
#ifdef _DEBUG h*%FZ}}`q  
#define new DEBUG_NEW  D3cJIVM  
#undef THIS_FILE o>_})WM1[  
static char THIS_FILE[] = __FILE__; rw,Ylr :3  
#endif ])wdd>'  
#define MAX_KEY 100 @>HTbs6W  
#define CTRLBIT 0x04 i+h*<){X  
#define ALTBIT 0x02 iI{L>  
#define SHIFTBIT 0x01 < mQXS87  
#pragma data_seg("shareddata") LP6 p  
HHOOK hHook =NULL; l3sF/zkH  
UINT nHookCount =0; |]4!WBK  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T[Zs{S  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT HwHF8#D*l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey O;~e^ <*  
static int KeyCount =0; }3^m>i*8  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift *[{j'7*cc  
#pragma data_seg() lFGuQLuqA{  
HINSTANCE hins; &1$d`>fn  
void VerifyWindow(); r|EN5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) R3~,&ab  
//{{AFX_MSG_MAP(CHookApp) B:T s_9*  
// NOTE - the ClassWizard will add and remove mapping macros here. J-hJqR*;K  
// DO NOT EDIT what you see in these blocks of generated code! Jqj!k*=/  
//}}AFX_MSG_MAP H:@hCO[a  
END_MESSAGE_MAP() zbmC? 2$  
Z+&V  >  
CHookApp::CHookApp() +P^ ;7"H  
{ #7 3pryXV  
 // TODO: add construction code here, {1)A"lQu  
 // Place all significant initialization in InitInstance w}gmVJ#p  
} `Gqe]ZE#"  
h+}BtKA  
CHookApp theApp; /~Y\KOH|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r,Uk)xa/^  
{ O;H6`JQ  
 BOOL bProcessed=FALSE; j{%;n40$  
 if(HC_ACTION==nCode) %rylmioW>  
 { ]xQv\u  
  if((lParam&0xc0000000)==0xc0000000){// Key up _ocCt XI9  
   switch(wParam) 23wztEp{a  
   { qD{1X25O  
    case VK_MENU: 5tYo! f  
     MaskBits&=~ALTBIT; +nE>)ZH  
     break; _#u\ar)  
    case VK_CONTROL: f' ?/P~[  
     MaskBits&=~CTRLBIT; Q#\Nhc  
     break; d5$D[,`1  
    case VK_SHIFT: 'OsZD?W{  
     MaskBits&=~SHIFTBIT; iApq!u,  
     break; & Q3Fgj  
    default: //judge the key and send message ,AP0*Ln  
     break; eX+36VG\  
   } w*-42r3,'  
   for(int index=0;index<MAX_KEY;index++){ U?UU] >Q  
    if(hCallWnd[index]==NULL) (9Zvr4.f7  
     continue; YNr"]SA@;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) B&]`OO>O  
    { M7TLQqaF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 2!{D~Gfl=  
     bProcessed=TRUE; fB8, )&  
    } #7]Jz.S  
   } ,U~A=bsa  
  } g'7E6n"!,  
  else if((lParam&0xc000ffff)==1){ //Key down +>"s)R43  
   switch(wParam) 1,-C*T}nR  
   { ye(b 7CX  
    case VK_MENU: l~i?  
     MaskBits|=ALTBIT; 0$*7lQ<a#M  
     break; 8K,X3a9  
    case VK_CONTROL: h p]J> i.  
     MaskBits|=CTRLBIT; >Zb!?ntN`t  
     break; aV\i3\da  
    case VK_SHIFT: Vu3DP+u|i  
     MaskBits|=SHIFTBIT; UzxL" `^7  
     break; YzESV Th  
    default: //judge the key and send message P8eCaZg?(3  
     break; )9hqd  
   } WC#6(H5t$  
   for(int index=0;index<MAX_KEY;index++) V&*IZt&  
   { ,8e'<y  
    if(hCallWnd[index]==NULL) .PB!1C.}@  
     continue; o{PG& }K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !*-|!Vz  
    { S(gr>eC5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); cnu&!>8V  
     bProcessed=TRUE; I L*B@E8  
    } (/A.,8Ad  
   } I0m7;M7 P  
  } Gyq 6?  
  if(!bProcessed){ ?()*"+N(ck  
   for(int index=0;index<MAX_KEY;index++){ ^Hx}.?1  
    if(hCallWnd[index]==NULL) e9{ii2M  
     continue; $ VT)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .C'\U[A{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -8 uS#  
   } 6u, g  
  } _%e8GWf  
 } Xdn&%5rI  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); B4y_{V  
} Fi i(dmn  
wW%b~JX  
BOOL InitHotkey() $|~ <6A{y  
{ uj8saNu  
 if(hHook!=NULL){ 287j,'vR  
  nHookCount++; ^B<-.(F  
  return TRUE; 4fi4F1f  
 } mkSu $c  
 else A (2 0+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); r8EJ@pOF2w  
  if(hHook!=NULL) @Tu`0 =8  
   nHookCount++; T8S&9BM7  
  return (hHook!=NULL); L1SX2F8  
} ?w:\0j5 ~  
BOOL UnInit() k4'] q  
{ i]ZGq7YJ%  
 if(nHookCount>1){ U1YqyG8  
  nHookCount--; .RroO_H   
  return TRUE; 7h\is  
 } "Hw%@]#  
 BOOL unhooked = UnhookWindowsHookEx(hHook); RdX+:!lD  
 if(unhooked==TRUE){ tK3$,9+  
  nHookCount=0; > "hP  
  hHook=NULL; Ti? "Hr<W  
 } m6i ,xn  
 return unhooked; Qsbyy>o)  
} QNbZ)  
Nw"df=,{  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;P S4@,  
{ ;>PHkJQ  
 BOOL bAdded=FALSE; z4YDngf=4  
 for(int index=0;index<MAX_KEY;index++){ N3u06  
  if(hCallWnd[index]==0){ /4;mjE  
   hCallWnd[index]=hWnd; y6$a:6  
   HotKey[index]=cKey; JG;}UuHYM  
   HotKeyMask[index]=cMask; OLx;j+p  
   bAdded=TRUE; }ILBX4c  
   KeyCount++; 2hHRitt36  
   break; I bD u+~)  
  } tR!C8:u  
 } |>ztx}\  
 return bAdded; 02,t  
} >#h,q|B  
Yi9Y`~J  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fM.#FT??  
{ XpANaqH\  
 BOOL bRemoved=FALSE; oXZWg~&l^  
 for(int index=0;index<MAX_KEY;index++){ PJK:LZw  
  if(hCallWnd[index]==hWnd){ ?= 7k<a~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ }XUL\6U  
    hCallWnd[index]=NULL; wqG#jC!5  
    HotKey[index]=0; &k'<xW?x  
    HotKeyMask[index]=0; ,u}wW*?,sT  
    bRemoved=TRUE; 'd N1~Pa  
    KeyCount--; #w''WOk@ZG  
    break; f>Rux1Je4  
   } x_3B) &9  
  } &$XTe2  
 } ? l~qb]._  
 return bRemoved; :Quep-:fy<  
} eBa#Z1Z  
]WNY"B>+  
void VerifyWindow() jG ouwta  
{ Jj)J5 S /  
 for(int i=0;i<MAX_KEY;i++){ b}(c'W*z%  
  if(hCallWnd!=NULL){ |OLXb+ 7X  
   if(!IsWindow(hCallWnd)){ GJdL1ptc  
    hCallWnd=NULL; ZY<R Nwu  
    HotKey=0; jTS8 qu  
    HotKeyMask=0; k;cIEEdZD  
    KeyCount--; @v`.^L{P  
   } ViW2q"4=  
  } ]U#of O  
 } )"?'~5A  
} w<~[ad}  
<zpxodM@T  
BOOL CHookApp::InitInstance() +o@:8!IM1  
{ f@`|2wG  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /S J><  
 hins=AfxGetInstanceHandle(); N4 x5!00  
 InitHotkey(); 8pEA3py  
 return CWinApp::InitInstance(); 6Gg`ExcT5  
} 1Xi>&;],  
sSh." H  
int CHookApp::ExitInstance() i=/hLE8T*  
{ ^zTe9:hz/\  
 VerifyWindow(); &w9*pJR %  
 UnInit(); Y-8BL  
 return CWinApp::ExitInstance(); v2tVq_\AMx  
} 8d$|JN;)  
xbi\KT`~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ZklO9Ox(  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Z;N3mD+\ye  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .RmFYV0,  
#if _MSC_VER > 1000 sf$hsPC^  
#pragma once Y;R,ph.a  
#endif // _MSC_VER > 1000 g}R#0gkdk}  
n><ad*|MX  
class CCaptureDlg : public CDialog k5>UAea_  
{ +8xT}mX  
 // Construction <',k%:t  
 public: [ PN2^  
  BOOL bTray; 6&]Z'nW0k  
  BOOL bRegistered; VsTgK  
  BOOL RegisterHotkey(); )o:sDj`b]  
  UCHAR cKey; 8N)Lck2PR  
  UCHAR cMask; _<]0hC  
  void DeleteIcon(); HPu+ 4xQV  
  void AddIcon(); &~;M16XM,e  
  UINT nCount; +-b'+mF  
  void SaveBmp(); Wtaz@ +  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor &3IkC(yD  
  // Dialog Data 8VG}-   
  //{{AFX_DATA(CCaptureDlg) 8D>5(Dg-  
  enum { IDD = IDD_CAPTURE_DIALOG }; iz^a Qx/  
  CComboBox m_Key; -J=6)  
  BOOL m_bControl; r]-n,  
  BOOL m_bAlt; Ae=JG8Ht~  
  BOOL m_bShift; ;ZuHv {=  
  CString m_Path; xtCMK1# x  
  CString m_Number; J;<dO7j5  
  //}}AFX_DATA fn/?I \  
  // ClassWizard generated virtual function overrides s#<fj#S  
  //{{AFX_VIRTUAL(CCaptureDlg) CH(Y.Kj-  
 public: M]X!D7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); D?%[du:V  
 protected: B#hvw'}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?f9M59(l  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Ge({sy>X  
  //}}AFX_VIRTUAL LK4NNZf7  
  // Implementation ">!pos`<C  
 protected: uO]|YF  
  HICON m_hIcon; vn*K\,  
  // Generated message map functions J|hVD  
  //{{AFX_MSG(CCaptureDlg) `3jwjy| 5  
  virtual BOOL OnInitDialog(); I++ Le%w  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); fJ\?+,  
  afx_msg void OnPaint(); ] 7[#K^  
  afx_msg HCURSOR OnQueryDragIcon(); *.eeiSi{  
  virtual void OnCancel(); E$z-|-{>  
  afx_msg void OnAbout(); cQxUEY('+  
  afx_msg void OnBrowse(); TDZ==<C  
  afx_msg void OnChange(); Y,L[0%  
 //}}AFX_MSG X]9<1[f  
 DECLARE_MESSAGE_MAP() lH?jqp  
}; q{}5wM  
#endif 3]'ab-,Vp  
_\yR/W~  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ]%-U~avph  
#include "stdafx.h" 4Th?q{X  
#include "Capture.h" pRh9+1EM;  
#include "CaptureDlg.h" o "0 ~  
#include <windowsx.h> MCTJ^g"D  
#pragma comment(lib,"hook.lib") D^>d<LX  
#ifdef _DEBUG M  hW9^?  
#define new DEBUG_NEW .fqy[qrM  
#undef THIS_FILE &Jb$YKt  
static char THIS_FILE[] = __FILE__; IhK SwT  
#endif h}'Hst  
#define IDM_SHELL WM_USER+1 Q=%W-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $bKXP(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E@otV6Wk[@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {S+?n[1r\  
class CAboutDlg : public CDialog @D*PO-s9  
{ ud(0}[  
 public: w%TrL+v  
  CAboutDlg(); sZ&6g<8#y  
  // Dialog Data z &P1C,n)  
  //{{AFX_DATA(CAboutDlg) 5m'AT]5Tn_  
  enum { IDD = IDD_ABOUTBOX }; d3\?:}o,  
  //}}AFX_DATA %^E 7Iqc  
  // ClassWizard generated virtual function overrides _(?`eWo  
  //{{AFX_VIRTUAL(CAboutDlg) "9^b1UH<  
 protected: \tvL<U"'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bh5P98s  
  //}}AFX_VIRTUAL &+(D< U  
  // Implementation At[Q0'jkc  
 protected: |*w)]2B l  
  //{{AFX_MSG(CAboutDlg) :zo5`[P  
  //}}AFX_MSG 1yz%ud-l  
  DECLARE_MESSAGE_MAP() V:j^!*  
}; E<tR8='F  
Eo ^m; p5  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) i"n_oO  
{ 0+1!-Wo  
 //{{AFX_DATA_INIT(CAboutDlg) Xu~N97\G  
 //}}AFX_DATA_INIT VI9rezZ*  
} Oq% TW|a#  
:4 z\Q]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3QZm *. /"  
{ OAiW8B Ae  
 CDialog::DoDataExchange(pDX); (y?F8]TfM  
 //{{AFX_DATA_MAP(CAboutDlg) zd8A8]&-  
 //}}AFX_DATA_MAP a;KdkykG  
} JW><&hY$"  
oL R/\Y(  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) NTX0vQG  
 //{{AFX_MSG_MAP(CAboutDlg) kl~/tbf  
 // No message handlers yU/?4/G!  
 //}}AFX_MSG_MAP Z2g<"M  
END_MESSAGE_MAP() {Mb<on W  
ng|^Zm%   
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @8`I!fZ  
: CDialog(CCaptureDlg::IDD, pParent) 3B%7SX  
{ o ~y{9Q  
 //{{AFX_DATA_INIT(CCaptureDlg) oDD"h,Z  
  m_bControl = FALSE; !hfpa_5  
  m_bAlt = FALSE; Kv1~,j6  
  m_bShift = FALSE; zRLJ|ejMP  
  m_Path = _T("c:\\"); uUx7>algF  
  m_Number = _T("0 picture captured."); >G"fMOOkW  
  nCount=0; IQC[ewk  
  bRegistered=FALSE; S-\wX.`R1  
  bTray=FALSE; FsO-xG"@"  
 //}}AFX_DATA_INIT KI#v<4C$P  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >Q(\vl@N=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5Hj/7~ =  
} @+zWLq!1pB  
W //+[  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) hTO 2+F*  
{ Va.TUz4  
 CDialog::DoDataExchange(pDX); bWb/>hI8 Q  
 //{{AFX_DATA_MAP(CCaptureDlg) t {1 [Ip  
  DDX_Control(pDX, IDC_KEY, m_Key); w+j\Py_G"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2.Ww(`swL  
  DDX_Check(pDX, IDC_ALT, m_bAlt); <G<5)$ S  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E <j=5|0t  
  DDX_Text(pDX, IDC_PATH, m_Path); 6J JA"] `  
  DDX_Text(pDX, IDC_NUMBER, m_Number); [S]q'c)  
 //}}AFX_DATA_MAP 44~ReN}`  
} EI?8/c  
vv Y?8/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 5CcX'*P  
//{{AFX_MSG_MAP(CCaptureDlg) _hl| 3 eW5  
 ON_WM_SYSCOMMAND()  r90tXx  
 ON_WM_PAINT() `EMGrw_  
 ON_WM_QUERYDRAGICON() \fC;b"j  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) bG"FN/vg  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) r|ZB3L|7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $$0 < &  
//}}AFX_MSG_MAP b p?TO]LH  
END_MESSAGE_MAP() KK >j V  
W!.FnM5x  
BOOL CCaptureDlg::OnInitDialog() i83Jy w,f  
{ uA =%EEZ  
 CDialog::OnInitDialog(); Bx}"X?%S  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _nzq(m1@  
 ASSERT(IDM_ABOUTBOX < 0xF000); ziO(`"v  
 CMenu* pSysMenu = GetSystemMenu(FALSE); fX,O9d$  
 if (pSysMenu != NULL) WW3Jxd  
 { A_ &IK;-go  
  CString strAboutMenu; %YF /=l  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {_.(,Z{  
  if (!strAboutMenu.IsEmpty()) mMZrBz7r  
  { X#0yOSR  
   pSysMenu->AppendMenu(MF_SEPARATOR); x4g6Qze  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yyu-y0_  
  } cf>lY  
 } * Uy>F[%@  
 SetIcon(m_hIcon, TRUE); // Set big icon ,3}+t6O"  
 SetIcon(m_hIcon, FALSE); // Set small icon P%yL{  
 m_Key.SetCurSel(0); kzUj)  
 RegisterHotkey(); Oz_CEMcy  
 CMenu* pMenu=GetSystemMenu(FALSE); 3;}YW^oXq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "#0P*3-c  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ho/tCU|w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); O\;Lb[`lb  
 return TRUE; // return TRUE unless you set the focus to a control 3HP { a  
} _a"| :kX  
rDwd!Jet  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [{xY3WS  
{ 6.45^'t]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) xA:;wV  
 { |p+FIr+  
  CAboutDlg dlgAbout; qR2cRepV  
  dlgAbout.DoModal(); (d NF)(wn  
 } 1z2v[S&pk  
 else IN1 n^f$:  
 { `hG`}G|^  
  CDialog::OnSysCommand(nID, lParam); rs>,p)  
 } g]44|9x(W  
} !U(S?:hvW  
hV`?, ~K  
void CCaptureDlg::OnPaint() r/NaoIrJV  
{ W6EEC<$JL  
 if (IsIconic()) hr'?#K  
 { x7l}u`N4  
  CPaintDC dc(this); // device context for painting 6OC4?#96%'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); og+Vrd  
  // Center icon in client rectangle mGP%"R2X  
  int cxIcon = GetSystemMetrics(SM_CXICON); }mZCQJ#`  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^_G#JJ\@$  
  CRect rect; &"tQpw5  
  GetClientRect(&rect); ny^uNIRPR  
  int x = (rect.Width() - cxIcon + 1) / 2; q |Pebe=  
  int y = (rect.Height() - cyIcon + 1) / 2; =w_T{V  
  // Draw the icon qa~ju\jm.  
  dc.DrawIcon(x, y, m_hIcon); dXY}B=C  
 } P*?2+.  
 else r SoT]6/   
 { x?0(K=h,  
  CDialog::OnPaint(); p.4Sgeh#  
 } ^HP$r*  
} MGw XZ7?E  
-Tuk.>i)  
HCURSOR CCaptureDlg::OnQueryDragIcon() Qqb%^}Xx'u  
{ g.:ZMV  
 return (HCURSOR) m_hIcon; H)*%eG~  
} K|~ !oQ  
&2@Rc?!6_P  
void CCaptureDlg::OnCancel() !m_y@~pV#u  
{ '5T:*Yh  
 if(bTray) T72Z<h|<  
  DeleteIcon(); Avljrds+7  
  CDialog::OnCancel(); zKYN5|17  
} 5>1c4u`x  
\Z%_dT}  
void CCaptureDlg::OnAbout() }Sh@.3*  
{ }\N ~%?6D  
 CAboutDlg dlg; 5 8U[IGs(  
 dlg.DoModal(); Z$Qwn  
} (l2n%LL]*  
\:n<&<aVSr  
void CCaptureDlg::OnBrowse() 8r,0Qic2K  
{ OaN"6Ge#  
 CString str; ^eRbp?H*T  
 BROWSEINFO bi; <7ag=IgDy  
 char name[MAX_PATH]; NgxJz ]b  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ) AGE"M3X  
 bi.hwndOwner=GetSafeHwnd(); 1Nv qtVC  
 bi.pszDisplayName=name; %_5?/H@%3z  
 bi.lpszTitle="Select folder"; V%M@zd?u.  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Iz#jR2:yn  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); JGzEm>_ m  
 if(idl==NULL) T`I4_x  
  return; !14v Ovj4{  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); cZ.p  
 str.ReleaseBuffer(); @v /Ae_q!  
 m_Path=str; 0Y~5|OXJ  
 if(str.GetAt(str.GetLength()-1)!='\\') 1Sns$t%b  
  m_Path+="\\"; q8e]{sT'!  
 UpdateData(FALSE); h: z$uG  
} daQJ{Cd,w  
dt<P6pK-  
void CCaptureDlg::SaveBmp() &)!N5Veb  
{ `v/p4/  
 CDC dc; 7Z}T!HFMr  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); KlwB oC/{K  
 CBitmap bm; Z y6kA\q  
 int Width=GetSystemMetrics(SM_CXSCREEN); Fb{HiU9<!  
 int Height=GetSystemMetrics(SM_CYSCREEN); 1[RI 07g7*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); vBY?3p,0p  
 CDC tdc; kk CoOTe&  
 tdc.CreateCompatibleDC(&dc); [-)BI|S:  
 CBitmap*pOld=tdc.SelectObject(&bm); _w5c-\-PUM  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ;t.)A3 PL  
 tdc.SelectObject(pOld); XzBl }4s  
 BITMAP btm; 56Lt "Z F  
 bm.GetBitmap(&btm); a63Ud<_a7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; \:Hh'-77q  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); gHWsKE  %  
 BITMAPINFOHEADER bih; mI;\ UOh'  
 bih.biBitCount=btm.bmBitsPixel; NeewV=[%  
 bih.biClrImportant=0; W{}M${6&  
 bih.biClrUsed=0; H,!yG5yF  
 bih.biCompression=0; K1- 3!G  
 bih.biHeight=btm.bmHeight; sa"!ckh  
 bih.biPlanes=1; ~Bt >Y  
 bih.biSize=sizeof(BITMAPINFOHEADER); )o::~ eu  
 bih.biSizeImage=size; u@4khN: ^p  
 bih.biWidth=btm.bmWidth; vcOw`oS  
 bih.biXPelsPerMeter=0; /5f=a  
 bih.biYPelsPerMeter=0; P$/Y9o  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \&v)#w  
 static int filecount=0; "t>H B6^  
 CString name; +5Y;JL<%/  
 name.Format("pict%04d.bmp",filecount++); >+[{m<Eq  
 name=m_Path+name; ge{%B~x  
 BITMAPFILEHEADER bfh; $cO-+Mr-~  
 bfh.bfReserved1=bfh.bfReserved2=0; Gx%f&H~Z^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); clT[ ?8*  
 bfh.bfSize=54+size; 'L%)B-,n  
 bfh.bfOffBits=54; c#fSt}J>C  
 CFile bf; Ee$F]NA  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Sjmq\A88dc  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,YrPwdaTB  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !3*%-8bp  
  bf.WriteHuge(lpData,size); 2<_|1%C  
  bf.Close(); X&%;(`  
  nCount++; gYw=Z_z  
 } $j0<ef!  
 GlobalFreePtr(lpData); 6s:  
 if(nCount==1) q:,ck@-4  
  m_Number.Format("%d picture captured.",nCount); P`n"E8"ab<  
 else 55Ye7P-d  
  m_Number.Format("%d pictures captured.",nCount); -wnBdL  
  UpdateData(FALSE); PW*[(VX  
} 2$joM`j$  
ZP4y35&%y  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) rWuqlx#  
{ 1z8fhE iiE  
 if(pMsg -> message == WM_KEYDOWN) @l~MY *hp  
 { A^7}:[s20  
  if(pMsg -> wParam == VK_ESCAPE) :rN5HOg^9  
   return TRUE; Ec!R3+  
  if(pMsg -> wParam == VK_RETURN) *,XT;h$'>  
   return TRUE; HwBJUr91]  
 } XpP}(A@G  
 return CDialog::PreTranslateMessage(pMsg); F:G Vysy  
} ;E\e.R  
1KI5tf>>p  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @p9YHLxLjQ  
{ ;.d{$SO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 0(|36 ;x  
  SaveBmp(); ]Mgxv>zRbs  
  return FALSE; `n%8y I%  
} ztaSIMZ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ /| [%~`?BM  
 CMenu pop; %T~LK=m  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +?C7(-U>  
 CMenu*pMenu=pop.GetSubMenu(0); N6/;p]|  
 pMenu->SetDefaultItem(ID_EXITICON); wg KM6?  
 CPoint pt; $"{I| UFC  
 GetCursorPos(&pt); ^cI RP  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); )s8{|)-  
 if(id==ID_EXITICON) pRh)DM#9  
  DeleteIcon(); e:iqv?2t  
 else if(id==ID_EXIT) J<ZG&m362p  
  OnCancel(); /h K/t;  
 return FALSE; iaQ3mk#  
} m/1;os5+8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); R-BN}ZS  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) m)xz_Plc  
 AddIcon(); !;&{Q^}  
 return res; MZ <BCRB  
} (L7%V !  
+C`zI~8  
void CCaptureDlg::AddIcon() R"{oj]d;$F  
{ ,) 3Eog\-  
 NOTIFYICONDATA data; 0d #jiG  
 data.cbSize=sizeof(NOTIFYICONDATA); EceD\}  
 CString tip; A@ 4Oq  
 tip.LoadString(IDS_ICONTIP); Qr*7bE(a  
 data.hIcon=GetIcon(0); +bcJm  
 data.hWnd=GetSafeHwnd(); G/_9!lE  
 strcpy(data.szTip,tip); 1(m[L=H5>  
 data.uCallbackMessage=IDM_SHELL; Nvj KB)J  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .^!uazPE0  
 data.uID=98; s!j vBy  
 Shell_NotifyIcon(NIM_ADD,&data); a^Lo;kHY  
 ShowWindow(SW_HIDE); [7=?I.\Cr7  
 bTray=TRUE; rPoq~p[Y  
} N5@l[F7I  
sFonc  
void CCaptureDlg::DeleteIcon() <FU1|  
{ =_9grF-  
 NOTIFYICONDATA data; 4*_.m9{  
 data.cbSize=sizeof(NOTIFYICONDATA); $or8z2d1  
 data.hWnd=GetSafeHwnd(); 9{n?Jy  
 data.uID=98; qM0Df0$?x  
 Shell_NotifyIcon(NIM_DELETE,&data); A&qZ:&(OM  
 ShowWindow(SW_SHOW); !wEz= i  
 SetForegroundWindow(); q `^5<  
 ShowWindow(SW_SHOWNORMAL); IM&l%6[).  
 bTray=FALSE; 4j-%I7  
} s7na!A[  
oD7^9=#  
void CCaptureDlg::OnChange() _[u fH*  
{ >$N ?\\#  
 RegisterHotkey(); 2vX!j!_  
} OA8iTn  
aX(Y `g)|  
BOOL CCaptureDlg::RegisterHotkey() OW1\@CC-69  
{ OmC F8:\/  
 UpdateData(); +p_>fO  
 UCHAR mask=0; mpDQhD[n  
 UCHAR key=0; {t QZqqdn@  
 if(m_bControl) 5jK9cF$>  
  mask|=4; g ,""j`  
 if(m_bAlt) =&v&qn e9  
  mask|=2; }#QYZ nR  
 if(m_bShift) e:zuP.R  
  mask|=1; [[VB'Rs  
  key=Key_Table[m_Key.GetCurSel()]; 6Bn%7ZBv  
 if(bRegistered){ ">"B  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); qgZN&7Nn:  
  bRegistered=FALSE; ~ZZJ/Cu  
 } hYU4%"X  
 cMask=mask; Y|N.R(sAs&  
 cKey=key; w2o5+G=  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ub=Bz1._  
 return bRegistered; j+Q E~L  
} iP+3)  
V75P@jv5J  
  四、小结 *S{fyYyM  
xBK is\b  
  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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