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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: 6xk"bIp  
  QMy;?,  
  一、实现方法 W E|L{  
fS1N(RZ 1  
  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: y"cK@sOo  
`Wn0v2@a(~  
#pragma data_seg("shareddata") Ea!}r| ~]0  
HHOOK hHook =NULL; //钩子句柄 #8;^ys1f  
UINT nHookCount =0; //挂接的程序数目 tI*u"%#t  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 >|6[uKrO  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Y'Wj7P  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _#f/VE  
static int KeyCount =0; q,aWF5m@  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 +**H7: bO  
#pragma data_seg() iBN,YPo~  
9^v|~f  
  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。 mgG0uV  
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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: O4 \GL  
|rW}s+Kcr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "SLN8x49(  
cKey,UCHAR cMask) w]tv<U={  
{ Eqp?cKrji  
 BOOL bAdded=FALSE; Mr2dhSQ !  
 for(int index=0;index<MAX_KEY;index++){ Fdm7k){A  
  if(hCallWnd[index]==0){ XXuU@G6Z7$  
   hCallWnd[index]=hWnd; cX7xG U  
   HotKey[index]=cKey; L.U [eH  
   HotKeyMask[index]=cMask; gWy 2$)  
   bAdded=TRUE; 87~. |nu  
   KeyCount++; ]hF[f|V  
   break; Bwb3@vNA  
  } %L/Wc,My  
 } ppb]RN|)  
 return bAdded; wA.YEI|CSj  
} 4)JrOe&k  
//删除热键 *N\U{)b\  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) zclt2?  
{ jGR_EE  
 BOOL bRemoved=FALSE; wXuHD<<  
 for(int index=0;index<MAX_KEY;index++){ (W=z0Lqu  
  if(hCallWnd[index]==hWnd){ OjJlGElw  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ (mt,:hX  
    hCallWnd[index]=NULL; Va(R*38k  
    HotKey[index]=0; F3H)B:  
    HotKeyMask[index]=0; SQ>.P  
    bRemoved=TRUE; ~S"G~a(&j  
    KeyCount--; #4%,09+  
    break; k-e_lSYk&c  
   } /Wg$.<!5 }  
  } g@MTKqs  
 } {n$9o  
 return bRemoved; KSh<_`j  
} 3z\:{yl  
,_u8y&<|I  
ThJLaNS  
  DLL中的钩子函数如下: 4xtbP\=   
aODOc J N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |;OM,U2  
{ ZN%$k-2  
 BOOL bProcessed=FALSE; 'V 1QuSd  
 if(HC_ACTION==nCode) ],qG!,V  
 { ^YenS6`F  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ~`T(mh',  
   switch(wParam) ZzzQXfA#  
   {  @L{HT8utK3  
    case VK_MENU: +;:i,`Lmg  
     MaskBits&=~ALTBIT; (d4zNYK  
     break; ^tc@bsUF  
    case VK_CONTROL: {r[ *}Bv  
     MaskBits&=~CTRLBIT; [K&O]s<Y  
     break; [g&Q_+,j  
    case VK_SHIFT: 8* >6+"w  
     MaskBits&=~SHIFTBIT; RUX!(Xw  
     break; h!yF   
    default: //judge the key and send message 7" Dw4}T  
     break; FT`y3 ~  
   } Ug3PZ7lK  
   for(int index=0;index<MAX_KEY;index++){ W`6nMFg  
    if(hCallWnd[index]==NULL) VIAj]Ul  
     continue; (zk'i13#6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sh2q#7hf  
    { >,uof?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Xw9,O8}C7  
     bProcessed=TRUE; e)!X9><J  
    } ]~3wq[O  
   } zHDC8m  
  } 9OF5A<%"u  
  else if((lParam&0xc000ffff)==1){ //有键按下 {YK6IgEsJe  
   switch(wParam) Z0b1E  
   { '(^p$=3|@D  
    case VK_MENU: #mx;t3ja7  
     MaskBits|=ALTBIT; RL.%o?<&?  
     break; L G{N  
    case VK_CONTROL: 7lR(6ka&/  
     MaskBits|=CTRLBIT; P1Re7/  
     break; 47`{ e_YP0  
    case VK_SHIFT: t!D=oBCro  
     MaskBits|=SHIFTBIT; *7BY$q  
     break; !G`w@E9M)  
    default: //judge the key and send message 2ZIf@C{P.  
     break; .Zf#L'Rf  
   } 8N ci1o  
   for(int index=0;index<MAX_KEY;index++){ =*"Amd,  
    if(hCallWnd[index]==NULL) uW Q`  
     continue; wqA5GK>m2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )ckx&e  
    { &[R&@l Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ( 5_oH  
     bProcessed=TRUE; AWD &K!  
    } ={={ W  
   } vQu) uml  
  } tQo"$ JN}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 W=I%3F_C"R  
   for(int index=0;index<MAX_KEY;index++){ oUltr  
    if(hCallWnd[index]==NULL) :T%,.sH  
     continue; (Clf]\_II  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k(%RX _]C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $dorE ~T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +-qD!(&-6  
   } '~3( s?B  
  } cX *  
 } "pMXTRb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); la|#SS95  
} u+8_et5T  
R;I}#b cJ  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 6<rc]T'|  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); iLv"ZqGrw  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^4 es  
5>h2WL  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: //H+S q66  
z-krL:A  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .(1=iL_3e  
{ ?G!^ |^S*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) nez5z:7F  
 { }@ 1LFZx  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^Ud`2 OW;2  
  SaveBmp(); 6kIq6rWF9  
  return FALSE; t MA  
 } ,,fLK1  
 …… //其它处理及默认处理 ELY$ ]^T  
} JK,#dA#  
RR`?o\  
yU .B(|  
  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。 ~@itZ,d\  
{) Y &Vr5  
  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。 tH>%`:  
V+Cb.$@  
  二、编程步骤 ~)oC+H@{  
6JK;]Ah  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; =YLt?5|e  
4~Lw:o1a  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; jWP(7}U  
G@,qO#5&  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Lc<Gn y^  
F!zZIaB]  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Kq-y1h]7H  
aASnk2DFd  
  5、 添加代码,编译运行程序。 pC#Z]_k  
LNg[fF^:  
三、程序代码 3b%y+?-{\u  
W=F?+Kg L  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL I&1Mh4yu  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) i}+dctg/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ >OiC].1   
#if _MSC_VER > 1000 :Tj,;0#/  
#pragma once He j0l^  
#endif // _MSC_VER > 1000 4:6@9.VVT  
#ifndef __AFXWIN_H__ +k8><_vr}  
#error include 'stdafx.h' before including this file for PCH 9;h 1;9sC|  
#endif EWH'x$z_q  
#include "resource.h" // main symbols [gQ~B1O  
class CHookApp : public CWinApp xvpS%MS  
{ Oe2Tmvl  
 public: &w/aQs~  
  CHookApp(); U$0#j  
  // Overrides __3Cjo^6&  
  // ClassWizard generated virtual function overrides $R7d*\(G  
  //{{AFX_VIRTUAL(CHookApp) Z)6bqU<LQE  
 public: $Fd9iJ!k  
  virtual BOOL InitInstance(); H Qf[T@  
  virtual int ExitInstance(); .bL{fBTT~  
  //}}AFX_VIRTUAL LR9dQ=fHS  
  //{{AFX_MSG(CHookApp) T(ponLh  
  // NOTE - the ClassWizard will add and remove member functions here. |mmIu_  
  // DO NOT EDIT what you see in these blocks of generated code ! ?P"ht  
  //}}AFX_MSG m;Sw`nw?  
  DECLARE_MESSAGE_MAP() -R6z/P (}  
}; W-Hw%bwN/q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); VZ_ 4B *D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); J5|Dduv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H+*o @0C\~  
BOOL InitHotkey(); T*A_F [  
BOOL UnInit(); FA4bv9:hi  
#endif v,p/r )E  
vQBfT% &Q-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. WdIr 3  
#include "stdafx.h" hnE@+(d=qJ  
#include "hook.h"  $7|0{Dw  
#include <windowsx.h> B;G|2um:$  
#ifdef _DEBUG oleRQ=  
#define new DEBUG_NEW LX*T<|c`'  
#undef THIS_FILE `"-)ObOj}  
static char THIS_FILE[] = __FILE__; OmKT}D~ 4  
#endif ShGR !r<  
#define MAX_KEY 100 HESwz{eSS  
#define CTRLBIT 0x04 }>)"!p;t_  
#define ALTBIT 0x02 wPqIy}-  
#define SHIFTBIT 0x01 Qj 0@^LA  
#pragma data_seg("shareddata") ZH&%D*a&  
HHOOK hHook =NULL; EZBk;*= B  
UINT nHookCount =0; <M+ZlF-`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f}XUxIQ-<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B8w 0DJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey $:mCyP<y  
static int KeyCount =0; }.` ycLW'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift . 1?AU 6\  
#pragma data_seg() WOgbz&S?J  
HINSTANCE hins; NGS/lKz  
void VerifyWindow(); 7CwG(c/5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) M[TgNWl/[  
//{{AFX_MSG_MAP(CHookApp) eJJvEvZ,  
// NOTE - the ClassWizard will add and remove mapping macros here. }tj@*n_  
// DO NOT EDIT what you see in these blocks of generated code! a*%>H(x  
//}}AFX_MSG_MAP Ce`{M&NSWX  
END_MESSAGE_MAP() jsi\*5=9p<  
*W# x#0j  
CHookApp::CHookApp() 9>%f99n  
{ v*3ezf\  
 // TODO: add construction code here, <VgnrqF6:  
 // Place all significant initialization in InitInstance oN)K2&M0  
} ,|T   
s(wbsRVP8  
CHookApp theApp; t ;y>q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) . 6Bz48*  
{ S ._9  
 BOOL bProcessed=FALSE; c9f~^}jNb  
 if(HC_ACTION==nCode) $&lS7}  
 { H!oP!rzEo  
  if((lParam&0xc0000000)==0xc0000000){// Key up y4M<L. RO  
   switch(wParam) H> _%ZXL  
   { bU_9GGG|  
    case VK_MENU: HjV83S;  
     MaskBits&=~ALTBIT; =@{H7z(p&  
     break; 8 +uOYNXsA  
    case VK_CONTROL: *^" 4 )  
     MaskBits&=~CTRLBIT; 6!b96bV  
     break; 6,s@>8n  
    case VK_SHIFT: a.c2ScXG  
     MaskBits&=~SHIFTBIT; ]6$NU [  
     break; r=qb[4HiV  
    default: //judge the key and send message yuKfhg7  
     break; R.> /%o  
   } "C}nS=]8m  
   for(int index=0;index<MAX_KEY;index++){ oOQnV(I  
    if(hCallWnd[index]==NULL) wIi(p5*  
     continue; $WTu7lVV[1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #2x\d  
    { ~Bj-n6QDE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); \? MuORg  
     bProcessed=TRUE;  bQ  
    } (:E^} &A  
   } u%h]k ,(E  
  } |h6)p;`gc  
  else if((lParam&0xc000ffff)==1){ //Key down qj/ 66ak  
   switch(wParam) m,*t}j0 7  
   { 1Pn!{ bU3@  
    case VK_MENU: ;~/  
     MaskBits|=ALTBIT; yUNl)E  
     break; vxbO>c   
    case VK_CONTROL: V-J\!CHX  
     MaskBits|=CTRLBIT; #T !YFMh;  
     break; |{ *ce<ip5  
    case VK_SHIFT: }$g5:k!  
     MaskBits|=SHIFTBIT; ?^,GaZ^V  
     break; Hhfqb"2on  
    default: //judge the key and send message 80:na7$)#  
     break; [f- #pew  
   } 5#WZXhlc}  
   for(int index=0;index<MAX_KEY;index++) =EV8~hMyqh  
   { I 9tdr<  
    if(hCallWnd[index]==NULL) MO/l(wO  
     continue; L`];i8=I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c5O1h8  
    { NIV&)`w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); -FE5sW  
     bProcessed=TRUE; KDHR} `  
    } Ur5X~a\y  
   } e2/[`k=7-  
  } pMs%`j#T  
  if(!bProcessed){ :/ "q NPJ  
   for(int index=0;index<MAX_KEY;index++){ %;ny  
    if(hCallWnd[index]==NULL) :vV?Yv%P)n  
     continue; bpKb<c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !f_Kq$.{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]lm9D@HMC  
   } z2nDD6N  
  } ?i9LqHL  
 } zb:p,T@5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @GjWeOj]  
} p/SJt0  
~-'nEATE  
BOOL InitHotkey() p?6w/n  
{ L;grH5K5  
 if(hHook!=NULL){ shP,-Vs #  
  nHookCount++; 5 _] i==M  
  return TRUE; ydoCoD w  
 } u~a<Psp&|  
 else 'nW:2(J  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R},mq&f5  
  if(hHook!=NULL) 2b3x|9o8  
   nHookCount++; Y}e$5  
  return (hHook!=NULL); tPFV6n i  
} ;QW)tv.y  
BOOL UnInit() 3%k@,Vvt  
{ FnL~8otPF'  
 if(nHookCount>1){ |A0kbC.  
  nHookCount--; 3osAWSCEL  
  return TRUE; okr'=iDg  
 } o2F6K*u}  
 BOOL unhooked = UnhookWindowsHookEx(hHook); coU`2n/  
 if(unhooked==TRUE){ zXp{9P\c  
  nHookCount=0; LH0\SmhU  
  hHook=NULL; ` YIpZ rB  
 } <R_3; 5J%  
 return unhooked; e$Md ?Pq  
} H |75,!<  
.X YSO  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) QeU>%qKT  
{ BA L!6  
 BOOL bAdded=FALSE; VYlg+MlT0  
 for(int index=0;index<MAX_KEY;index++){ &5C%5C~ch  
  if(hCallWnd[index]==0){ g[:5@fI#*  
   hCallWnd[index]=hWnd; nD E5A  
   HotKey[index]=cKey; T>W(Caelq  
   HotKeyMask[index]=cMask; tAYu|\]  
   bAdded=TRUE; ^VoQGP/cl  
   KeyCount++; Ml0d^l}'  
   break; BKVvu}V(o  
  } wk)gxn1A,  
 } rP#@*{";  
 return bAdded; Z#^2F8,]  
} &W|'rA'r  
S@Jl_`<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 85Ms*[g  
{ Y@;bA=Du}  
 BOOL bRemoved=FALSE; /kNr5s  
 for(int index=0;index<MAX_KEY;index++){ aD0w82s]J  
  if(hCallWnd[index]==hWnd){ Q7`zrCh  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .8fOc.h8h  
    hCallWnd[index]=NULL; W 6~<7  
    HotKey[index]=0; ou96 P<B  
    HotKeyMask[index]=0; Gz ^g!N[  
    bRemoved=TRUE; 24|:VxO  
    KeyCount--; kD"dZQx  
    break; wBCnP  
   } f)N67z6  
  } sHh2>f@x$  
 } )e]:T4*vo  
 return bRemoved; q;Qpd]H  
} ]Jv Z:'g}  
.L6t3/^  
void VerifyWindow() e`8z1r  
{ gY;N>Yq,C  
 for(int i=0;i<MAX_KEY;i++){ 6 U# C  
  if(hCallWnd!=NULL){ ;?%2dv2d  
   if(!IsWindow(hCallWnd)){ Q;5aM%a`  
    hCallWnd=NULL; &[JI L=m5  
    HotKey=0; b @5&<V;r2  
    HotKeyMask=0; vJXd{iQE@C  
    KeyCount--; H+_oK ]/  
   } x"U/M ?l  
  } QT^( oog=  
 } I]ywO4  
} zXZy:SD  
:sM|~gT  
BOOL CHookApp::InitInstance() ("mW=Ln  
{ h7(twct  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); t1IC0'o-  
 hins=AfxGetInstanceHandle(); 2c9@n9Vx3a  
 InitHotkey(); {zmo7~=  
 return CWinApp::InitInstance(); ed*=p l3.  
} =ngu*#?c4  
^<sX^V+{  
int CHookApp::ExitInstance() 2ZLK`^S  
{ x7{,4js  
 VerifyWindow(); QR79^A@5  
 UnInit(); &t p5y}=n  
 return CWinApp::ExitInstance(); $#"}g#u  
} Zad+)~@!tq  
GpxGDN3?  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9YB~1 M  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \^':(Gu4o  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7+=j]+O  
#if _MSC_VER > 1000 MS,H12h  
#pragma once bYG}CO  
#endif // _MSC_VER > 1000 L\hPw{)  
`1pri0!  
class CCaptureDlg : public CDialog )?Jj#HtW  
{ /?2yo{F g  
 // Construction %;^6W7  
 public: zIRa%%.i<  
  BOOL bTray; gU+BRTZ&x  
  BOOL bRegistered; (Grj_p6O  
  BOOL RegisterHotkey(); V@cRJ3ZF  
  UCHAR cKey; mb\vHu*53  
  UCHAR cMask; * Q51'?y  
  void DeleteIcon(); Z(U&0GH`  
  void AddIcon(); y"7TO#  
  UINT nCount; G++kU o<  
  void SaveBmp(); B}r@xz  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor D.$EvUSK<.  
  // Dialog Data Xb|hP  
  //{{AFX_DATA(CCaptureDlg) X ,T^(p  
  enum { IDD = IDD_CAPTURE_DIALOG }; li NPXS+  
  CComboBox m_Key; sM~CP zMa  
  BOOL m_bControl; +R#*eo;o7  
  BOOL m_bAlt; Nnv&~ D>  
  BOOL m_bShift; ,0#OA* 0B  
  CString m_Path; $OjsaE %  
  CString m_Number; GlD@Ud>o)  
  //}}AFX_DATA nJ2l$J<  
  // ClassWizard generated virtual function overrides a$9UUH-|  
  //{{AFX_VIRTUAL(CCaptureDlg) h3O5DP6~  
 public: i_gS!1Z2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); f_;3|i  
 protected: %!YsSk,   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  ocL  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Z < uwqA  
  //}}AFX_VIRTUAL Rs<,kMRGVL  
  // Implementation EcwH O  
 protected: e(!a~{(kq%  
  HICON m_hIcon; mHw1n=B  
  // Generated message map functions ;Oe6SNquT  
  //{{AFX_MSG(CCaptureDlg) hM>xe8yE  
  virtual BOOL OnInitDialog(); vuw1ycy)  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?\^u},HnE|  
  afx_msg void OnPaint(); |vEfE{  
  afx_msg HCURSOR OnQueryDragIcon(); bh+R9~  
  virtual void OnCancel(); ed\,FWR  
  afx_msg void OnAbout(); '7_'s1  
  afx_msg void OnBrowse(); _^&oNm1  
  afx_msg void OnChange(); y>wr $  
 //}}AFX_MSG D8Ni=.ALL  
 DECLARE_MESSAGE_MAP() I`5MAvP  
}; 5Vut4px  
#endif i<%(Z[9Lk  
.dM 0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /a9+R)Al  
#include "stdafx.h" iW |]-Ba\  
#include "Capture.h" v SWqOv$  
#include "CaptureDlg.h" a&Z|3+ZA  
#include <windowsx.h> m=%W<8[V  
#pragma comment(lib,"hook.lib") 94K ;=5h  
#ifdef _DEBUG (y(V,kXwa8  
#define new DEBUG_NEW TXrC5AJx  
#undef THIS_FILE oZOFZ-<  
static char THIS_FILE[] = __FILE__; s'/.ea V_  
#endif S:^Q(w7  
#define IDM_SHELL WM_USER+1 4I,@aj46  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }m0Lr:vq<r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M5P63=1+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; FIG5]u  
class CAboutDlg : public CDialog ?]paAP;4  
{ Kz^aW  
 public: @?gH3Y_  
  CAboutDlg(); k^ZUOWmU|  
  // Dialog Data b[BSUdCB  
  //{{AFX_DATA(CAboutDlg) 39k P)cD  
  enum { IDD = IDD_ABOUTBOX }; nz>A\H  
  //}}AFX_DATA $dwv1@M2  
  // ClassWizard generated virtual function overrides %iJ6;V 4  
  //{{AFX_VIRTUAL(CAboutDlg) L6Ynid.k  
 protected: pCpj#+|_)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support aIqNNR  
  //}}AFX_VIRTUAL dIM:U :c  
  // Implementation }Pw5*duq  
 protected: >n` OLHg;  
  //{{AFX_MSG(CAboutDlg) )03.6 Pvs  
  //}}AFX_MSG O`@$YXuD  
  DECLARE_MESSAGE_MAP() EDnmYaa)dZ  
}; !)LR41>?  
WpmypkJA#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) "rAm6b-`  
{ .X:{s,@  
 //{{AFX_DATA_INIT(CAboutDlg) [Q^kO;  
 //}}AFX_DATA_INIT w)!(@}vd  
} BE3~f6 `  
CTPn'P=\C  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1noFXzeU3  
{ *w@>zkBl  
 CDialog::DoDataExchange(pDX); G&3j/5V  
 //{{AFX_DATA_MAP(CAboutDlg) ef,6>xv  
 //}}AFX_DATA_MAP x/9`2X`~  
} - MBK/  
~zRW*pd  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ?BWWb   
 //{{AFX_MSG_MAP(CAboutDlg) 3QXGbu}:h!  
 // No message handlers +mF}j=k  
 //}}AFX_MSG_MAP R[_7ab]A  
END_MESSAGE_MAP() T /] ayc:  
'{7A1yJnY%  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) kg !@i7  
: CDialog(CCaptureDlg::IDD, pParent) +<3tv&"  
{ c4; `3  
 //{{AFX_DATA_INIT(CCaptureDlg) ]v9<^!  
  m_bControl = FALSE; @aj"1 2  
  m_bAlt = FALSE; 5_`.9@eh.  
  m_bShift = FALSE; /&kTVuN"(  
  m_Path = _T("c:\\"); ,'ndQ{\9  
  m_Number = _T("0 picture captured."); XeZv%` ?  
  nCount=0; PE4{;|a }  
  bRegistered=FALSE; [{Y$]3?}  
  bTray=FALSE; KNK0w5  
 //}}AFX_DATA_INIT @j^qT-0M  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 1TbKnmTx  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Xf#;GYO|2  
} LW2Sko?Yo  
,xR^8G 8  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) />$)o7U`+  
{ hW|t~|j#_  
 CDialog::DoDataExchange(pDX); _xmM~q[c7p  
 //{{AFX_DATA_MAP(CCaptureDlg) 'nCBLc8  
  DDX_Control(pDX, IDC_KEY, m_Key); .Qi`5C:U  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); D/{-  
  DDX_Check(pDX, IDC_ALT, m_bAlt); R'9TD=qEK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L8ZCGW\Rr  
  DDX_Text(pDX, IDC_PATH, m_Path); .#+rH}=Z  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ?=PQQx2_*u  
 //}}AFX_DATA_MAP i\`[0dfY  
} 0~FX!1;  
rj:$'m7  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $jw!DrE  
//{{AFX_MSG_MAP(CCaptureDlg) z:fd'NC  
 ON_WM_SYSCOMMAND() <:%Iq13D  
 ON_WM_PAINT() YJ:CqTy  
 ON_WM_QUERYDRAGICON() @V<tg"(c  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) NghQ#c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2+Fq'!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) >\@6i s  
//}}AFX_MSG_MAP gbI0?G6XN/  
END_MESSAGE_MAP() C6/,-?%)  
x^C,xP[#Y;  
BOOL CCaptureDlg::OnInitDialog() @c{Z?>dUc#  
{ 31bKgU{  
 CDialog::OnInitDialog(); "@Te!.~A.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 6aj)Fe'2  
 ASSERT(IDM_ABOUTBOX < 0xF000); #G]s.by('  
 CMenu* pSysMenu = GetSystemMenu(FALSE); O:u^jcXA  
 if (pSysMenu != NULL) <89 js87  
 { \x|(`;{  
  CString strAboutMenu; {yfG_J  
  strAboutMenu.LoadString(IDS_ABOUTBOX); kvo741RO6  
  if (!strAboutMenu.IsEmpty()) @B1rtw6  
  { 5))?,YkrrI  
   pSysMenu->AppendMenu(MF_SEPARATOR); |5Z@7  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ff{ESFtD  
  } `T~M:\^D  
 } LoTq2/  
 SetIcon(m_hIcon, TRUE); // Set big icon GLk7# Y  
 SetIcon(m_hIcon, FALSE); // Set small icon 3S.rIai+  
 m_Key.SetCurSel(0); 7R)"HfUh  
 RegisterHotkey();  rZDKVx  
 CMenu* pMenu=GetSystemMenu(FALSE); n JLr]`_  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); al" 1T-  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 38  B\ \  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); w|RG  
 return TRUE; // return TRUE unless you set the focus to a control 4>, <b1Y  
} ||/noUK  
x9@%L{*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (j cLzq  
{ `@`Q"J  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) |7f}icXKur  
 { "e(OO/EZS  
  CAboutDlg dlgAbout; ss-Be  
  dlgAbout.DoModal(); Q[g%((DL  
 } VF 6@;5p  
 else pX!S*(Q{  
 { ;jnnCXp>  
  CDialog::OnSysCommand(nID, lParam); g3Ff<P P  
 } /n:s9eq  
} > m5j.GP;  
/#Ew{RvW'  
void CCaptureDlg::OnPaint() !7}5"j ;A  
{ Oys.8%+ P  
 if (IsIconic()) J.El&Dev  
 { I5 [r-r  
  CPaintDC dc(this); // device context for painting A$^}zP'u0<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); G19FSLrtA  
  // Center icon in client rectangle _c%~\LOk  
  int cxIcon = GetSystemMetrics(SM_CXICON); g fO.Ky6  
  int cyIcon = GetSystemMetrics(SM_CYICON); (}Gl'.>\M  
  CRect rect; \8<bb<`  
  GetClientRect(&rect); W]rXt,{ &  
  int x = (rect.Width() - cxIcon + 1) / 2; tuUk48!2I  
  int y = (rect.Height() - cyIcon + 1) / 2; W_M]fjL.  
  // Draw the icon EJL45R>  
  dc.DrawIcon(x, y, m_hIcon); iVmf/N@A|  
 } f2yc]I<lr~  
 else A03PEaZO  
 { na/t=<{  
  CDialog::OnPaint(); N%>/ e'(  
 } a0AIq44  
} 0w(<pNA  
 ~LkReQI  
HCURSOR CCaptureDlg::OnQueryDragIcon() r^Gl~sX  
{ lW7kBCsz#  
 return (HCURSOR) m_hIcon; J7mT&U&Ru  
} 2t[inzn=E  
WL$WWA08_  
void CCaptureDlg::OnCancel() 6 rmK_Y  
{ d eTUfbd'  
 if(bTray) qjTz]'^BpM  
  DeleteIcon(); o F @{&  
  CDialog::OnCancel(); >Z>*Iz,LP  
} #7'ww*+  
W+1V&a}E  
void CCaptureDlg::OnAbout() S0"O U0`N  
{ ts)0+x  
 CAboutDlg dlg; KWXJ[#E<W  
 dlg.DoModal(); Tk+\Biq   
} ,g^Bu {?  
nA+[[(6  
void CCaptureDlg::OnBrowse() S: /ShT  
{ l*%?C*  
 CString str; } #%sI"9  
 BROWSEINFO bi; pY-iz M L  
 char name[MAX_PATH];  rro,AS}  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 7tfFRUw  
 bi.hwndOwner=GetSafeHwnd(); pk"JcUzR  
 bi.pszDisplayName=name; @*_#zU#g  
 bi.lpszTitle="Select folder"; h=)Im )  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 0MPsF{Xw[  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]=h Ts%]w  
 if(idl==NULL) A6#ob  
  return; }V9146  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); kv)LH{  
 str.ReleaseBuffer(); S,Oy}Nv  
 m_Path=str; )5]z[sE  
 if(str.GetAt(str.GetLength()-1)!='\\') |a'Q^aT  
  m_Path+="\\"; J'2R-CI,  
 UpdateData(FALSE); ZZlR:D  
} [i&z_e)  
9E (>mN  
void CCaptureDlg::SaveBmp() cL=P((<K?  
{ RV&2y=eb  
 CDC dc; G#l zB`i  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?F`lI""E  
 CBitmap bm; H&%=>hyX  
 int Width=GetSystemMetrics(SM_CXSCREEN); fpoH7Jd V  
 int Height=GetSystemMetrics(SM_CYSCREEN); J-u,6c  
 bm.CreateCompatibleBitmap(&dc,Width,Height); t,MK#Ko  
 CDC tdc; #=$4U!yL  
 tdc.CreateCompatibleDC(&dc); b6]M}ixK  
 CBitmap*pOld=tdc.SelectObject(&bm); Z$[A.gD4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BH*vsxe  
 tdc.SelectObject(pOld); *TMg.  
 BITMAP btm; PQf FpmG  
 bm.GetBitmap(&btm); L@G)K  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; SHwl^qVk[  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); q2,@>#  
 BITMAPINFOHEADER bih; +ES.O]?>  
 bih.biBitCount=btm.bmBitsPixel; 9|'bPOKe  
 bih.biClrImportant=0; VgoQz]z  
 bih.biClrUsed=0; %/U Q0d~b  
 bih.biCompression=0; KAUYE^  
 bih.biHeight=btm.bmHeight; +mxsjcq0  
 bih.biPlanes=1; R o%S_!  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ppx*  
 bih.biSizeImage=size; ~2"|4  
 bih.biWidth=btm.bmWidth; vtvr{Uqo@  
 bih.biXPelsPerMeter=0; TF3Tha]  
 bih.biYPelsPerMeter=0; OFUN hbg  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Ha 3XH_  
 static int filecount=0; e348^S&rG  
 CString name; ZJw9 2Sb  
 name.Format("pict%04d.bmp",filecount++); \,(tP:o  
 name=m_Path+name; E}a3.6)p  
 BITMAPFILEHEADER bfh; `SIJszqc  
 bfh.bfReserved1=bfh.bfReserved2=0; AM Rj N;  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 6^ KDc  
 bfh.bfSize=54+size; I>P</TE7  
 bfh.bfOffBits=54; &[3!Lk`.0  
 CFile bf; EA8(_}  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Ye )(9  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); mexI }  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); h]'fX  
  bf.WriteHuge(lpData,size); 4NEk#n  
  bf.Close(); dxASU|Yo9  
  nCount++; TyK; q{  
 } 6J=~*&  
 GlobalFreePtr(lpData); *X<De  
 if(nCount==1) jCa{WV:K}  
  m_Number.Format("%d picture captured.",nCount); c%B=TAs5c  
 else WMI/Y 9N  
  m_Number.Format("%d pictures captured.",nCount); 4wNxn lP  
  UpdateData(FALSE); h eh! cDK  
} 7&sCEYEb  
8 3<kaeu,^  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) i[YYR,X|  
{ V<d'psb 6  
 if(pMsg -> message == WM_KEYDOWN) cBm3|@7  
 { }!.7QpA$  
  if(pMsg -> wParam == VK_ESCAPE) f[ER`!  
   return TRUE; tv;3~Y0i  
  if(pMsg -> wParam == VK_RETURN) -7+Fb^"L  
   return TRUE; X^@d@xU4v  
 } [hFyu|I !  
 return CDialog::PreTranslateMessage(pMsg); Z:n33xh=<  
} .{8lG^0U<  
{'vvE3iZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xt`znNN  
{ |kVxrq  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ GZ4{<QG  
  SaveBmp(); Riw>cVi~  
  return FALSE; 1hMk\ -3S  
} I#A`fJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ j+Tk|GRab  
 CMenu pop; C8{CKrVE  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); e`_3= kI  
 CMenu*pMenu=pop.GetSubMenu(0); V];RQWs  
 pMenu->SetDefaultItem(ID_EXITICON); L9AfLw5&X  
 CPoint pt; Dd{{ d?;B  
 GetCursorPos(&pt); ev+N KUi=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #Io#OG<7b  
 if(id==ID_EXITICON) ||_F /AD  
  DeleteIcon(); w{UU(  
 else if(id==ID_EXIT) (m,O!935f  
  OnCancel(); A"P1 B]  
 return FALSE; q?t>!1c  
} 6zNN 8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); h{TnvI/"  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ({i|  
 AddIcon(); I5D\Z  
 return res; 0\ gE^=o[  
} w$t2Hd  
f,?7,?x  
void CCaptureDlg::AddIcon() DSnsi@Mi  
{ (8>k_  
 NOTIFYICONDATA data; ^\wosB3E  
 data.cbSize=sizeof(NOTIFYICONDATA); eM~i (]PY  
 CString tip; /Pf7=P  
 tip.LoadString(IDS_ICONTIP); :!#-k  
 data.hIcon=GetIcon(0); ,f1+jC  
 data.hWnd=GetSafeHwnd(); dk3\~m%Pv  
 strcpy(data.szTip,tip); B j*X_m  
 data.uCallbackMessage=IDM_SHELL; Q2#)Jx\6!  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  $hN!DHz  
 data.uID=98; , D&FCs%v  
 Shell_NotifyIcon(NIM_ADD,&data); nF//y}  
 ShowWindow(SW_HIDE); =RV$8.Xp  
 bTray=TRUE; 4 A  
} F 'h[g.\}  
t>b^S,  
void CCaptureDlg::DeleteIcon() {`}RYfZ  
{ Dljq  
 NOTIFYICONDATA data; DSIa3! 0  
 data.cbSize=sizeof(NOTIFYICONDATA); {wMCo ,  
 data.hWnd=GetSafeHwnd(); \KPz  
 data.uID=98; wDSU~\  
 Shell_NotifyIcon(NIM_DELETE,&data); p<J/J.E  
 ShowWindow(SW_SHOW); D1Fc7! TV  
 SetForegroundWindow(); J}.p6E~j  
 ShowWindow(SW_SHOWNORMAL); #:{u1sq;  
 bTray=FALSE; {<|0M%v  
} ?pVODnP k  
> h:~*g  
void CCaptureDlg::OnChange() MZ+"Arzb  
{ T$q]iSgu  
 RegisterHotkey(); $4eogI7N>w  
} xW^<.@Agm  
oZzE.Q1T  
BOOL CCaptureDlg::RegisterHotkey() xAoozDj  
{ )_&<u\cm L  
 UpdateData(); &2Y>yFB ,  
 UCHAR mask=0; =F:d#j>F  
 UCHAR key=0; S ":-5S6  
 if(m_bControl) K1C#  
  mask|=4; CBF>157B  
 if(m_bAlt) W*_ifZ0s.  
  mask|=2; #ob">R  
 if(m_bShift) hxtu^E/  
  mask|=1; U 26Iz  
  key=Key_Table[m_Key.GetCurSel()]; (*M(gM{;  
 if(bRegistered){ 8,H  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6Es-{u(,  
  bRegistered=FALSE; lc'Jn$O@  
 } }LE/{]A  
 cMask=mask; 'Y-c*q  
 cKey=key; 9> (8r+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M2m@N-+R   
 return bRegistered; ",K6zALJ  
} w)}[)}T!  
%iX +"  
  四、小结 8 {QvB"w  
/Db~-$K  
  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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