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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: (YYg-@IO  
  k_,& Q?GtU  
  一、实现方法 ![_0GFbT  
J ffaT_"\  
  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: 0QW=2rs  
wiZ  
#pragma data_seg("shareddata") S} OO)  
HHOOK hHook =NULL; //钩子句柄 dd<l;4(  
UINT nHookCount =0; //挂接的程序数目 z)U7  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Dqii60  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 |u^S}"@3sU  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey :o{,F7(P  
static int KeyCount =0; Gj-nT N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 e%L[bGW'  
#pragma data_seg() ;*<R~HJt  
uO eal^uS  
  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。 p> >H$t  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: oC49c~`8  
 jF0"AA  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR RPgz"-  
cKey,UCHAR cMask) J](NCD  
{ @WS77d~S  
 BOOL bAdded=FALSE; 86 e13MF  
 for(int index=0;index<MAX_KEY;index++){ ;J TY#)Bh  
  if(hCallWnd[index]==0){ >~rlnRX  
   hCallWnd[index]=hWnd; ERIMz ,  
   HotKey[index]=cKey; th[v"qD9G  
   HotKeyMask[index]=cMask; ty.$ H24  
   bAdded=TRUE; ed#fDMXGQ%  
   KeyCount++; A2:}bb~H  
   break; g ,EDE6`8  
  } O_a^|ln&  
 } {FI*oO1A~  
 return bAdded; @QVg5  
} ]&]DF Y~n  
//删除热键 gh ?[x.U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C&H'?0Y@  
{ aMhVO(+FW  
 BOOL bRemoved=FALSE; k%cE8c}R;A  
 for(int index=0;index<MAX_KEY;index++){ .cQO?UKK  
  if(hCallWnd[index]==hWnd){ Wy7w zt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,7Hyrx`  
    hCallWnd[index]=NULL; <n]PD;.4  
    HotKey[index]=0; v;o1c44;  
    HotKeyMask[index]=0; iLuC_.'u=  
    bRemoved=TRUE; }8Y! -qX  
    KeyCount--; (vZ-0Ep}  
    break; ~ W8X g)  
   } Uc {m##!  
  } s__xBY  
 } sV a0eGc  
 return bRemoved; \Dq'~ d  
} z80P5^9  
bc'IoD/  
=b:XL#VA  
  DLL中的钩子函数如下: EwN{|34C  
MVzuE}  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f1ANziC;i  
{ 196a~xNV  
 BOOL bProcessed=FALSE; d'ZNp2L  
 if(HC_ACTION==nCode) }`<&l  
 { Ph[MXb:*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 D/."0 #q  
   switch(wParam) vnvpb! @Q  
   {  "x=\mA#`  
    case VK_MENU: .A<Hk1(-)  
     MaskBits&=~ALTBIT; ;(/go\m tB  
     break; :IS?si5|  
    case VK_CONTROL: p  lnH  
     MaskBits&=~CTRLBIT; -t|/g5.w_  
     break; 0d_)C>gcF  
    case VK_SHIFT: }OAU5P!rp  
     MaskBits&=~SHIFTBIT; hbx4[Pf  
     break; Cj8&wz}ez  
    default: //judge the key and send message C(G.yd  
     break; p!YK~cH[  
   } zx}+Q B0  
   for(int index=0;index<MAX_KEY;index++){ T(*,nJi~9  
    if(hCallWnd[index]==NULL) SKH}!Id}n  
     continue; )DXt_leLg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <C'_:&M  
    { /"gRyv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  80@\e  
     bProcessed=TRUE; Bgm8IK)6  
    } ?/3wO/7[  
   } W|>jj$/o  
  } QLO;D)fC  
  else if((lParam&0xc000ffff)==1){ //有键按下 B&a{,.m&q6  
   switch(wParam) FFcCoPX_  
   { eW(pP>@k,  
    case VK_MENU: 5 qfvHQ ~M  
     MaskBits|=ALTBIT; imYfRi=$  
     break; H<_Tn$<zH.  
    case VK_CONTROL: U~: H>  
     MaskBits|=CTRLBIT; k=mQG~  
     break; bu _ @>`S  
    case VK_SHIFT: }MRgNr'k  
     MaskBits|=SHIFTBIT; >6 o <Q  
     break; %`&n ;K.c  
    default: //judge the key and send message Z\IM~-  
     break; y 9]d{:9  
   } lw9jk`7^  
   for(int index=0;index<MAX_KEY;index++){ ZxnPSA@%  
    if(hCallWnd[index]==NULL) 'lZlfS:Z8  
     continue; >+dS PI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) et 1HbX  
    { 7@;*e=v  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3k)xzv%r`  
     bProcessed=TRUE; =IMmtOvJ  
    } zas&gsl-;  
   } jum"T\  
  } SF:98#pg  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ]XEyG7D  
   for(int index=0;index<MAX_KEY;index++){ ; CCg]hX  
    if(hCallWnd[index]==NULL) FLMiW]?x  
     continue; L[2qCxB'^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z[c8W@OJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ta)gOc)r R  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 {zcG%b WJ  
   } Ep;uz5 ^8  
  } `nyz,  
 } .4CDQ&B0K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m0bxVV^DK!  
} 9!n:hhJM  
l7VO8p]y[R  
  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: #,#_"  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |D)CAQn,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]vQa~}  
_R\FB|_  
  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: ?C2(q6X+s  
,"`20.Lv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #'&-S@/nQs  
{ -w"I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) W]D YfR,  
 { %>*?uO`z[  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 UJ}}H}{  
  SaveBmp(); b;QgL_w  
  return FALSE; 8`*5[ L~~/  
 } oT{9P?K8  
 …… //其它处理及默认处理 u* pQVU  
} 1 Gr^,Ry  
-KGJr  
0BC @wV  
  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。 bra2xHK@  
Sn-#Y(>]o0  
  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。 )jL@GW  
=cl#aS}e8  
  二、编程步骤 P;I,f  
$JOz7j(  
  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"; ,5c7jZ5H  
ZvF#J_%gE5  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; .@&FJYkLYi  
}6[jJ`=gOx  
  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; _|C3\x1c  
h/\v+xiF  
  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; _K9PA[m5 ~  
3J"`mQ  
  5、 添加代码,编译运行程序。 uY~mi9E  
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三、程序代码 IMD^(k 2  
Ja3#W K  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL {Ycgq%1>]  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9mD dX  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ P[ o"%NZ'  
#if _MSC_VER > 1000 $R #_c}  
#pragma once MlWKfe<  
#endif // _MSC_VER > 1000 GcRH$,<XG  
#ifndef __AFXWIN_H__ {O _X/y~  
#error include 'stdafx.h' before including this file for PCH aZ~e;}w.Zq  
#endif rwDLBpk  
#include "resource.h" // main symbols I '0[  
class CHookApp : public CWinApp *x8~}/[T(F  
{ ZiR}S  
 public: ph6/+[:  
  CHookApp(); qY-aR;  
  // Overrides <. Tllk@r)  
  // ClassWizard generated virtual function overrides O;VqrO  
  //{{AFX_VIRTUAL(CHookApp) -btNwE6[.  
 public: xCL)<8[R,}  
  virtual BOOL InitInstance(); =M 8Mt/P  
  virtual int ExitInstance(); ;*qXjv& K  
  //}}AFX_VIRTUAL KN_n:`cH{  
  //{{AFX_MSG(CHookApp) g=D]=&H  
  // NOTE - the ClassWizard will add and remove member functions here. k`>qb8,  
  // DO NOT EDIT what you see in these blocks of generated code ! R,D/:k'~k  
  //}}AFX_MSG '~ b  
  DECLARE_MESSAGE_MAP() -aJ(-Np$f  
}; 49E| f ^q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %t_'rv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); G:b6Wf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); x%X3FbF]  
BOOL InitHotkey(); 8i "CU:(  
BOOL UnInit(); A&1EOQ=N  
#endif eJqx,W5MK]  
G--vwvL  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. e[x,@P`  
#include "stdafx.h" 6'*6tS  
#include "hook.h" [5xm>Y&}  
#include <windowsx.h> Lb$Uba-_  
#ifdef _DEBUG |6-9vU!LK?  
#define new DEBUG_NEW 60~*$`  
#undef THIS_FILE Jy:@&c  
static char THIS_FILE[] = __FILE__; n2*Ua/J-8  
#endif CxaI@+  
#define MAX_KEY 100 7Z]?a  
#define CTRLBIT 0x04 =z5=?  
#define ALTBIT 0x02 0D4 4  
#define SHIFTBIT 0x01 Pq~#SxA~  
#pragma data_seg("shareddata") W\<OCD%X  
HHOOK hHook =NULL; d3EN0e+^  
UINT nHookCount =0; oa+'.b~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ui8$F "I*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ;Uch  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey C,;<SV2#  
static int KeyCount =0;  @B{  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift t#M[w|5?  
#pragma data_seg() ';.TQ_I7Y  
HINSTANCE hins; hK4ww"-  
void VerifyWindow(); 7]u_  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,FYA*}[  
//{{AFX_MSG_MAP(CHookApp) :Dr4?6hdr  
// NOTE - the ClassWizard will add and remove mapping macros here. CNuE9|W(vI  
// DO NOT EDIT what you see in these blocks of generated code! gz'{l[  
//}}AFX_MSG_MAP Sy.%>$z  
END_MESSAGE_MAP() )+ G0m,n  
K&._fG  
CHookApp::CHookApp() .))k  
{ M97+YMY)  
 // TODO: add construction code here, uR")@Tc  
 // Place all significant initialization in InitInstance sfG9R"  
} LU*mR{B  
:zC=JvKT  
CHookApp theApp; MeV4s%*O+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 56."&0  
{ ^38k xwh  
 BOOL bProcessed=FALSE; fm^tU0DY  
 if(HC_ACTION==nCode) n}%_H4t  
 { x2~fc  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9[{q5  
   switch(wParam) F9w2+z.  
   { 1jSmTI d  
    case VK_MENU: jz'%(6#'gW  
     MaskBits&=~ALTBIT; eG1A7n'6W  
     break; Y edF%  
    case VK_CONTROL: vRmzjd~  
     MaskBits&=~CTRLBIT; !N:w?zsp  
     break; /jaO\t'q  
    case VK_SHIFT: |L;Hd.l7^*  
     MaskBits&=~SHIFTBIT; fiAj# mX  
     break; {>R933fap  
    default: //judge the key and send message ][z!};  
     break; WVyq$p/V  
   } t- //.  
   for(int index=0;index<MAX_KEY;index++){ Zjc/GO  
    if(hCallWnd[index]==NULL) UT_t]m  
     continue; 8/"uS;yP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qyE*?73W  
    { R$/q=*k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Nde1`W]:  
     bProcessed=TRUE; 50S*_4R  
    } ('_S1?y  
   } ;h~kB  
  } |c]L]PU  
  else if((lParam&0xc000ffff)==1){ //Key down BH^cR<<j  
   switch(wParam)  !vr A\d  
   { W70BRXe04D  
    case VK_MENU: %&O'>L  
     MaskBits|=ALTBIT; iee`Yg!EOH  
     break; 0,LUi*10  
    case VK_CONTROL: 8r.MODZG/  
     MaskBits|=CTRLBIT; F j"]C.6B.  
     break; @bFl8-  
    case VK_SHIFT: F>u/Lh!  
     MaskBits|=SHIFTBIT; TTxSl p2=;  
     break; 3z 5"Ckzb  
    default: //judge the key and send message f`J[u!Ja  
     break; s;[64ca]Q  
   } Q!fk|D+j  
   for(int index=0;index<MAX_KEY;index++) \Zk<|T61$  
   { ^^Q> AfTR.  
    if(hCallWnd[index]==NULL) ||Wg'$3  
     continue; H,fVF837  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ]G~u8HPH!m  
    { j1@PfKh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); FZ% WD@=  
     bProcessed=TRUE; 'xOH~RlE  
    } :)Nk  
   } t1l4mdp  
  } 6 1K:SXj  
  if(!bProcessed){ zt )WX9  
   for(int index=0;index<MAX_KEY;index++){ 7sJGB^vM  
    if(hCallWnd[index]==NULL) n{F&GE="  
     continue; 4,6?sTuX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 0?g&<q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \?k"AtL  
   } tUFXx\p  
  } "FfP&lF/  
 } o, qBMo^.  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P$A'WEO'  
} |SsmVW$B|  
C Yk"  
BOOL InitHotkey() ?rwHkPJ{*  
{ zL:k(7E  
 if(hHook!=NULL){ Uv3Fe%>  
  nHookCount++; ~!dO2\X+  
  return TRUE; (7P VfS>;  
 } %aJ8wYj*  
 else LTio^uH  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); y{qKb:~wv  
  if(hHook!=NULL) qB=%8$J  
   nHookCount++; NEMC  
  return (hHook!=NULL); W QyMM@#  
} }Mh`j $  
BOOL UnInit() *7/MeE6)i  
{ I#t# %!InH  
 if(nHookCount>1){ u&Y1,:hiL  
  nHookCount--; C'0=eel[  
  return TRUE; .$-%rU:*}  
 } 1\Vp[^#Vx  
 BOOL unhooked = UnhookWindowsHookEx(hHook); !% yd'"6Dl  
 if(unhooked==TRUE){ ez*O'U  
  nHookCount=0; *&yt;|y  
  hHook=NULL; [IuF0$w=dj  
 } |G>Lud  
 return unhooked; a`QKN rA2  
} m[*y9A1  
UXV>#U?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fxX4 !r  
{ kv/mqKVr  
 BOOL bAdded=FALSE; A v%'#1w<"  
 for(int index=0;index<MAX_KEY;index++){ t.m C q 4{  
  if(hCallWnd[index]==0){ <3aW3i/jTc  
   hCallWnd[index]=hWnd; X1~ B  
   HotKey[index]=cKey; a{8g9a4  
   HotKeyMask[index]=cMask; 8U&93$  
   bAdded=TRUE; `wLa.Gzj  
   KeyCount++; Ja6PX P]'  
   break; qeZ*!H6-  
  } u'EzYJ7  
 } ~bk+JK- >  
 return bAdded; W(UrG]J*l  
} J"RmV@|  
%L;'C v  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wrt^0n'r)c  
{ GGwHz]1L  
 BOOL bRemoved=FALSE; 5oI gxy  
 for(int index=0;index<MAX_KEY;index++){ VYN1^Tp  
  if(hCallWnd[index]==hWnd){ cn!Y7LVr  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^c]lEo  
    hCallWnd[index]=NULL; ;;l-E>X0  
    HotKey[index]=0; 0E#3XhU  
    HotKeyMask[index]=0; v/lQ5R1  
    bRemoved=TRUE; @#5PPXp  
    KeyCount--; _-g?6q  
    break; 0?nm`9v6  
   } %phv<AW  
  } KFMEY\6\h  
 } /_*L8b  
 return bRemoved; ?rgk  
} BAS3&fA  
x,SzZ)l-9  
void VerifyWindow() GiN\@F!  
{ S7 Tem:/  
 for(int i=0;i<MAX_KEY;i++){ F[S Ys/M  
  if(hCallWnd!=NULL){ 0if~qGm=!  
   if(!IsWindow(hCallWnd)){ T&`H )o  
    hCallWnd=NULL; 0Bpix|mq  
    HotKey=0; "ewB4F[  
    HotKeyMask=0; BSu ]NOwe  
    KeyCount--; WSW,}tFp"  
   } #I.Wmfz  
  } %A<|@OSdOa  
 } _=eeZ4f  
} x p#+{}  
{r!X W  
BOOL CHookApp::InitInstance() 2x7%6'  
{ ;tF7 GjEp  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); j.@TPf*  
 hins=AfxGetInstanceHandle(); _ %HyXd  
 InitHotkey(); c*g(R.!  
 return CWinApp::InitInstance(); !Z6GID})p  
} jci'q=Vpu  
8HyK;+ZkVd  
int CHookApp::ExitInstance() EI29;  
{ zF[>K4  
 VerifyWindow(); f`j RLo*L  
 UnInit(); >aZ$x/U+Iw  
 return CWinApp::ExitInstance(); huau(s0um  
} m{bw(+r  
E30VKh |  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {]}}rx'|P  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^vmyiF  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sGCV um}  
#if _MSC_VER > 1000 ~ 0x9`~  
#pragma once ;Vad| -  
#endif // _MSC_VER > 1000 %@{);5[  
.TURS  
class CCaptureDlg : public CDialog }>w;(R  
{ 5UwaBPj4  
 // Construction m3k}Q3&6Z  
 public: yp=2nU"o  
  BOOL bTray; vTD`Ja#h  
  BOOL bRegistered; S) [`Bm  
  BOOL RegisterHotkey(); `bGAc&,&  
  UCHAR cKey; m#'2 3  
  UCHAR cMask; g|PVOY+|^  
  void DeleteIcon(); uE>2 *u\  
  void AddIcon(); a<[@p  
  UINT nCount; 1(Kd/%]{  
  void SaveBmp(); Zjt3U;Y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^z$-NSlI  
  // Dialog Data 6|05-x|  
  //{{AFX_DATA(CCaptureDlg) :Q\b$=,:  
  enum { IDD = IDD_CAPTURE_DIALOG }; m&OzT~?_>N  
  CComboBox m_Key; HzM^Zn57%  
  BOOL m_bControl; B_[^<2_  
  BOOL m_bAlt; V&DS+'P  
  BOOL m_bShift; #Vanw!  
  CString m_Path; "6n~, $  
  CString m_Number; J%3%l5 /  
  //}}AFX_DATA S5'BXE,  
  // ClassWizard generated virtual function overrides er}/~@JJ  
  //{{AFX_VIRTUAL(CCaptureDlg) ,|b<as@X  
 public: 77OH.E|$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); c{j0A;XMS  
 protected: A1p;Ye>o~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5-}4jwk  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gydPy*  
  //}}AFX_VIRTUAL gQ*0Mk  
  // Implementation z@$7T: H>  
 protected: jGEUl=W  
  HICON m_hIcon; LZyUlz  
  // Generated message map functions 4)iSz>  
  //{{AFX_MSG(CCaptureDlg) X#(?V[F]  
  virtual BOOL OnInitDialog(); )k3zOKZ;  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {y'c*NS  
  afx_msg void OnPaint(); (hVhzw"~  
  afx_msg HCURSOR OnQueryDragIcon(); q?&vV`PG5  
  virtual void OnCancel(); VVvV]rU~  
  afx_msg void OnAbout(); Rw*l#cr=.  
  afx_msg void OnBrowse(); iU{F\>  
  afx_msg void OnChange(); Jk|c!,!  
 //}}AFX_MSG w:& m_z#M  
 DECLARE_MESSAGE_MAP()  8OZc:/  
}; yuk64o2QE  
#endif 4W~pAruwr  
ld4QhZia  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file xe2Ap[Y'M  
#include "stdafx.h" Tul_/`An  
#include "Capture.h" h{yqNl  
#include "CaptureDlg.h" 7Rk eV  
#include <windowsx.h> ;p/RS#  
#pragma comment(lib,"hook.lib") y:D|U!o2V  
#ifdef _DEBUG L\5j"] }`  
#define new DEBUG_NEW F>)u<f,C  
#undef THIS_FILE c{6!}0Q4  
static char THIS_FILE[] = __FILE__; "o`N6@[w^  
#endif ;4Y@xS2M  
#define IDM_SHELL WM_USER+1 U/m6% )Yx(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GrW+P[j9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); [(5;jUmF@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WL7R.!P  
class CAboutDlg : public CDialog P8Fq %k  
{ v1QE|@  
 public: Xp{+){Iu  
  CAboutDlg(); 7Nw7a;h  
  // Dialog Data u}JL*}Q  
  //{{AFX_DATA(CAboutDlg) WsTbqR)W%  
  enum { IDD = IDD_ABOUTBOX }; +y>D3I  
  //}}AFX_DATA YL=?Nk/  
  // ClassWizard generated virtual function overrides OO] ~\j  
  //{{AFX_VIRTUAL(CAboutDlg) ot]E\g+!  
 protected: )$I;)` q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +eZR._&0  
  //}}AFX_VIRTUAL >0=`3X|Y7  
  // Implementation PtCwr)B,  
 protected: @ O5-w  
  //{{AFX_MSG(CAboutDlg) =GTltFqI1  
  //}}AFX_MSG G?{BVWtl}  
  DECLARE_MESSAGE_MAP() Xlpu_H|  
}; Bl2y~fCA  
/-b)`%Q|Y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >;dMumX  
{ b!J21cg<L  
 //{{AFX_DATA_INIT(CAboutDlg) suN{)"  
 //}}AFX_DATA_INIT Xa.Qt.C  
} RRqHo~*0  
d,CtlWp  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 5*xk8*  
{ r ioNP(  
 CDialog::DoDataExchange(pDX); Pdmfn8I]%  
 //{{AFX_DATA_MAP(CAboutDlg) 5vj;lJKcd`  
 //}}AFX_DATA_MAP ]vMr@JM-G  
} YQvN;W  
}+h/2D  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ZWQrG'$?o8  
 //{{AFX_MSG_MAP(CAboutDlg) jwgXq(  
 // No message handlers 5m!FtHvm1  
 //}}AFX_MSG_MAP !5wm9I!5^  
END_MESSAGE_MAP() ,o& &d.  
XMd-r8yYr  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 1@6dHFA`o  
: CDialog(CCaptureDlg::IDD, pParent) w,cfSF;=tC  
{ xAw$bJj~s  
 //{{AFX_DATA_INIT(CCaptureDlg) &[f.;1+C  
  m_bControl = FALSE; OW- [#r  
  m_bAlt = FALSE; rn#FmM  
  m_bShift = FALSE;  jhjb)r.  
  m_Path = _T("c:\\"); fpJM)HU  
  m_Number = _T("0 picture captured."); ce{(5IC  
  nCount=0; ` =g9Rg/<  
  bRegistered=FALSE; 3`S|I_$(T"  
  bTray=FALSE; zs<W>gBq  
 //}}AFX_DATA_INIT \ce (/I   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4n @}X-)  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); HpSmB[WF  
} @.;] $N&J  
s!esk%h{K  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) r63_|~JVB<  
{ "K n JUXpl  
 CDialog::DoDataExchange(pDX); CB{% ~  
 //{{AFX_DATA_MAP(CCaptureDlg) YjN2 ,Xi  
  DDX_Control(pDX, IDC_KEY, m_Key); 3o&PVU? Q  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); i_Dv+^&zV  
  DDX_Check(pDX, IDC_ALT, m_bAlt); D 's'LspQ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 9otA5I^v  
  DDX_Text(pDX, IDC_PATH, m_Path); P9= L?t.  
  DDX_Text(pDX, IDC_NUMBER, m_Number); SN+B8*!  
 //}}AFX_DATA_MAP d0ThhO  
} -.-j e"E  
-Zx hh  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .V G$`g"  
//{{AFX_MSG_MAP(CCaptureDlg) -\6nT'P  
 ON_WM_SYSCOMMAND() F(c~D0  
 ON_WM_PAINT() GxE"q-G  
 ON_WM_QUERYDRAGICON() /HbxY  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) eSo/1D  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) gDE',)3Q,  
 ON_BN_CLICKED(ID_CHANGE, OnChange) rqbX9M^  
//}}AFX_MSG_MAP m99j]w r~c  
END_MESSAGE_MAP() &$F4/2|b%  
}#}IR5`=E  
BOOL CCaptureDlg::OnInitDialog() 7Gb1[3  
{ to{/@^ D  
 CDialog::OnInitDialog(); iJ.P&T9  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Z0*Lm+d9z  
 ASSERT(IDM_ABOUTBOX < 0xF000); {* S8n09v  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $MD|YW5  
 if (pSysMenu != NULL) 4|*b{Ni  
 { R\k= CoJJ  
  CString strAboutMenu; par| j]  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i(R&Q;{E^  
  if (!strAboutMenu.IsEmpty()) 6(Za}H  
  { (O{5L(  
   pSysMenu->AppendMenu(MF_SEPARATOR); W/_=S+CvK  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); B;Pws$J  
  } G{$(t\>8  
 } qjcy{@ j  
 SetIcon(m_hIcon, TRUE); // Set big icon jO xH' 1I  
 SetIcon(m_hIcon, FALSE); // Set small icon Vj?{T(K1[  
 m_Key.SetCurSel(0); 5sJi- ^  
 RegisterHotkey(); C@+"d3  
 CMenu* pMenu=GetSystemMenu(FALSE); lU]/nKyd  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Kq!E<|yM  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b]S4\BBT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *?jU$&Qpj*  
 return TRUE; // return TRUE unless you set the focus to a control =f'MiU!p6  
} ga0>J_  
B.wihJVDg  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) KV1zx(WI  
{ ]jo^P5\h>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `L<f15][  
 { `:WVp~fn  
  CAboutDlg dlgAbout; 9>~UqP9  
  dlgAbout.DoModal(); A*l(0`aWq  
 } V9xZH5T8^  
 else lK;/97Ze  
 { RqTW$94RD  
  CDialog::OnSysCommand(nID, lParam); zTi %j$o  
 } -$Bom  
} zA+&V7bvy  
WK7=z3mu  
void CCaptureDlg::OnPaint() ?^iX%   
{ -:9E+b  
 if (IsIconic()) cU}j Whu  
 { Jp)>Wd  
  CPaintDC dc(this); // device context for painting m~s.al(G91  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); I"awvUP]a[  
  // Center icon in client rectangle kIS&! V  
  int cxIcon = GetSystemMetrics(SM_CXICON); U" eP>HHp  
  int cyIcon = GetSystemMetrics(SM_CYICON); aYQ!`mS::M  
  CRect rect; y- S]\tu  
  GetClientRect(&rect); 1B~H*=t4h  
  int x = (rect.Width() - cxIcon + 1) / 2; >L$g ;(g  
  int y = (rect.Height() - cyIcon + 1) / 2; KobNi#O+  
  // Draw the icon R03V+t=  
  dc.DrawIcon(x, y, m_hIcon); e6s-;  
 } F5Ce:+h  
 else xR5jy|2JJ  
 { _2{i}L  
  CDialog::OnPaint(); .S/W_R  
 } dP0!?J Y  
} /|] %0B  
:CEhc7gU  
HCURSOR CCaptureDlg::OnQueryDragIcon() >W 2Z]V  
{ G hH0-g{-  
 return (HCURSOR) m_hIcon; ]>h2h?2te  
} S9X~<!]  
$^R[t;  
void CCaptureDlg::OnCancel() x9r5 ;5TI  
{ ,6rg00wGE  
 if(bTray) .v [8ie  
  DeleteIcon(); Te?UQX7Z}M  
  CDialog::OnCancel(); b;\qF&T  
} eK\ O>  
\ ?['pB  
void CCaptureDlg::OnAbout() (mXV5IM  
{ ,2u-<8  
 CAboutDlg dlg; e#`wshtN:  
 dlg.DoModal(); s]Z/0:`  
} HKO00p7  
PQAN,d  
void CCaptureDlg::OnBrowse() C`OdMM>D  
{ TL@_m^SM  
 CString str; GIQ/gM?Pv  
 BROWSEINFO bi; mj :8ZZ  
 char name[MAX_PATH]; b\~rL,7(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); qA:CV(Z  
 bi.hwndOwner=GetSafeHwnd(); . (*V|&n  
 bi.pszDisplayName=name; K V ^ `  
 bi.lpszTitle="Select folder"; m;o \.s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *=}$@O S  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Gad! }dz  
 if(idl==NULL) +GMM&6<  
  return;  K9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "^~f.N  
 str.ReleaseBuffer(); 30]?Jz6m  
 m_Path=str; z<_{m 4I;  
 if(str.GetAt(str.GetLength()-1)!='\\') EOhUr=5~  
  m_Path+="\\"; b8)>:F  
 UpdateData(FALSE); h$|K vS  
} xin<.)!E  
(A`/3Aq+  
void CCaptureDlg::SaveBmp() M$A"<5  
{ 1fwCQM   
 CDC dc; `9b/Q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); k{Yj!C> #  
 CBitmap bm; g<oSTA w  
 int Width=GetSystemMetrics(SM_CXSCREEN); R^P~iAO  
 int Height=GetSystemMetrics(SM_CYSCREEN); [0N==Ym1  
 bm.CreateCompatibleBitmap(&dc,Width,Height); dix\hqZ  
 CDC tdc; 3EB8ls2  
 tdc.CreateCompatibleDC(&dc); 1R9hA7y&,/  
 CBitmap*pOld=tdc.SelectObject(&bm); Q)yhpwrX  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); mJ0nyjX^  
 tdc.SelectObject(pOld); ?1}1uJMj-  
 BITMAP btm; j['Z|Am"l  
 bm.GetBitmap(&btm); LKY4rY!|@d  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; MdT'xYomzQ  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); fKIwdk%!-  
 BITMAPINFOHEADER bih; x:=Kr@VP  
 bih.biBitCount=btm.bmBitsPixel; csT_!sI I  
 bih.biClrImportant=0; C/%umazP9  
 bih.biClrUsed=0; ftsr-3!Vm  
 bih.biCompression=0; -tZ2 N  
 bih.biHeight=btm.bmHeight; x, a[ p\1  
 bih.biPlanes=1; 95^w" [}4Q  
 bih.biSize=sizeof(BITMAPINFOHEADER); h";G vjy  
 bih.biSizeImage=size; ("o <D{A  
 bih.biWidth=btm.bmWidth; Y>Q9?>}Q  
 bih.biXPelsPerMeter=0; P"W$ZX  
 bih.biYPelsPerMeter=0; ;^xlDN  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ftF?T.dx  
 static int filecount=0; OM{-^  
 CString name; Hk8:7"4Q  
 name.Format("pict%04d.bmp",filecount++); F6Zl#eL  
 name=m_Path+name; KbVV[ *  
 BITMAPFILEHEADER bfh; 7qA);N  
 bfh.bfReserved1=bfh.bfReserved2=0; K97lP~Hu  
 bfh.bfType=((WORD)('M'<< 8)|'B'); z.oDH<1  
 bfh.bfSize=54+size; ?qYw9XQYL  
 bfh.bfOffBits=54; 1t=Y+|vA9  
 CFile bf;  (:].?o  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |332G64K  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); h J#U;GL  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~\DC )  
  bf.WriteHuge(lpData,size); %yJL-6U  
  bf.Close(); {4ON2{8;4  
  nCount++; C,z7f"  
 } EaFd1  
 GlobalFreePtr(lpData); A_T-]YQ  
 if(nCount==1) zMt"ST.  
  m_Number.Format("%d picture captured.",nCount); g"( vl-Uw  
 else Y'Sxehx  
  m_Number.Format("%d pictures captured.",nCount); ?mS798=f  
  UpdateData(FALSE); 4JFi|oK0H  
} Xj"/6|X  
fG;)wQJ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) o %A4wEye  
{ lYT}Nc4"="  
 if(pMsg -> message == WM_KEYDOWN) CjORL'3  
 { 75wQH*  
  if(pMsg -> wParam == VK_ESCAPE) `rW{zQYM  
   return TRUE; :+ @-F>Q  
  if(pMsg -> wParam == VK_RETURN) r0l ud&_9  
   return TRUE; Y }'C'PR  
 } i;*c|ma1>  
 return CDialog::PreTranslateMessage(pMsg); 9c8zH{T_{  
} *fW&-ic  
|M  `B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rAIX(2@cR_  
{ 8^&)A b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ lF5;K c  
  SaveBmp(); B o.x  
  return FALSE; xT{qeHeZ9,  
} -r]s #$  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -'3vQXj&  
 CMenu pop; #B"ki{Se*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); COc1np  
 CMenu*pMenu=pop.GetSubMenu(0); W!.UMmw`  
 pMenu->SetDefaultItem(ID_EXITICON); Wt()DG|[  
 CPoint pt; ,W5pe#n  
 GetCursorPos(&pt); G{}E~jDi?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PV(b J7&R  
 if(id==ID_EXITICON) 9fMg?  
  DeleteIcon(); jpZX5_o  
 else if(id==ID_EXIT) 9z\q_ 0&i  
  OnCancel(); < Up n~tH  
 return FALSE; 511^f`P<  
} kf_s.Dedw  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?,]%V1(@V`  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u9"b,].b  
 AddIcon(); ' IFbD["r  
 return res; q`E6hm  
} 0aSN 8  
)NRY9\H  
void CCaptureDlg::AddIcon() *:\-:*  
{ 1%^U=[#2`  
 NOTIFYICONDATA data; h eZJ(mR  
 data.cbSize=sizeof(NOTIFYICONDATA); KCq qwGM  
 CString tip; Lg|j0-"N  
 tip.LoadString(IDS_ICONTIP); `x~k}  
 data.hIcon=GetIcon(0); p*_g0_^  
 data.hWnd=GetSafeHwnd(); F0o7XUt  
 strcpy(data.szTip,tip); MG[?C2KA/  
 data.uCallbackMessage=IDM_SHELL; z 4Qz9#*"^  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B{H;3{0  
 data.uID=98; JVwYV5-O<0  
 Shell_NotifyIcon(NIM_ADD,&data); E0\ '  
 ShowWindow(SW_HIDE); qc|;qPj   
 bTray=TRUE; E,shTh%&~  
} \yNjsG@,  
y7wy9+>l  
void CCaptureDlg::DeleteIcon() i|Lir{vW  
{ i' %V}2  
 NOTIFYICONDATA data; :IV4]`  
 data.cbSize=sizeof(NOTIFYICONDATA); {a `kPfP  
 data.hWnd=GetSafeHwnd(); :m_0WT  
 data.uID=98; :RzcK>Gub=  
 Shell_NotifyIcon(NIM_DELETE,&data); 5ap}(bO  
 ShowWindow(SW_SHOW); Y~dRvt0_w  
 SetForegroundWindow(); )M#~/~^f+  
 ShowWindow(SW_SHOWNORMAL); <d# 9d.<  
 bTray=FALSE; (3 8.s:-  
} ?(*KQ#d  
@7 &rDZ  
void CCaptureDlg::OnChange() jkQv cU  
{ 5b0Ipg  
 RegisterHotkey(); Ko\m8\3?fK  
} 7~C@x+1S/  
W:4]-i?2  
BOOL CCaptureDlg::RegisterHotkey() 0@C`QW%m  
{ ]n${j/x  
 UpdateData(); GuQ3$B3j  
 UCHAR mask=0; BqvOi~ l  
 UCHAR key=0; )_ NQ*m  
 if(m_bControl) FfI $3:9  
  mask|=4; m=z-}T5y!T  
 if(m_bAlt) \! Os!s  
  mask|=2;  DC]FY|ff  
 if(m_bShift) KqcelI?-I  
  mask|=1; +z+25qWi  
  key=Key_Table[m_Key.GetCurSel()]; ^(V!vI*  
 if(bRegistered){ rs~RKTv-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,aV89"}  
  bRegistered=FALSE; _MR|(mV  
 } @za?<G>!'e  
 cMask=mask; +I/7eIG?|  
 cKey=key; ~d/Doi  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  v#IW;Rj8  
 return bRegistered; %g5weiFM  
} E+dr\Xhv  
@,CCwiF'q  
  四、小结 Z?oFee!4  
4FQU$f  
  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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