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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: ^M q@} 0  
  0x5Ax=ut  
  一、实现方法 F@q9UlfB-  
}i^|.VZZ  
  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: K x) PK  
T* 0;3&sA  
#pragma data_seg("shareddata") ! M CV@5$  
HHOOK hHook =NULL; //钩子句柄 iEr?s-or  
UINT nHookCount =0; //挂接的程序数目 ovM;6o  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9D M,,h<`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 P;z\vq<h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Nr$78] o9  
static int KeyCount =0; <7rj,O1=  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 #|Lsi`]+  
#pragma data_seg() '/03m\7  
#;^UW  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 1_f+! ns#  
9oGcbD4*  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: |,oLZC Na  
T"za|Fo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fi*b]a\'  
cKey,UCHAR cMask) pKq[F*Lut  
{ "h[)5V{  
 BOOL bAdded=FALSE; 'V:MppQVZ.  
 for(int index=0;index<MAX_KEY;index++){ >FOCdlJ#  
  if(hCallWnd[index]==0){ 1~~GF_l?  
   hCallWnd[index]=hWnd; aAGV\o{^  
   HotKey[index]=cKey; yc3/5]E&  
   HotKeyMask[index]=cMask; -`\^_nVC  
   bAdded=TRUE; &Lt$~}*&6  
   KeyCount++; j_}:=3  
   break; N1c 0>{  
  } #CI0G  
 } y6d!?M(0U  
 return bAdded; g3[-[G^5  
} [[<TW}  
//删除热键 25vjn 1$sW  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rYdNn0mh k  
{ 62'9lriQ  
 BOOL bRemoved=FALSE; 8M,o)oH  
 for(int index=0;index<MAX_KEY;index++){ wH@S$WT  
  if(hCallWnd[index]==hWnd){ Fs4shrt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 5,^DT15a4P  
    hCallWnd[index]=NULL; )mOM!I7D@  
    HotKey[index]=0; l#^?sbG  
    HotKeyMask[index]=0; ibQ xL3  
    bRemoved=TRUE; 3]JJCaf  
    KeyCount--; FqbGT(QB0  
    break; 2%R.~9HtA  
   } d-Z2-89K  
  } sBI/`dGZV  
 } e/+.^ '{  
 return bRemoved; T|BlFJ0"  
} Os>&:{D4!  
Ty{ SZU J  
N.z2eo  
  DLL中的钩子函数如下: S WTZ6(!oW  
?K2EK'-q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OwNM`xSa|\  
{ l\AdL$$Mb  
 BOOL bProcessed=FALSE; 9RJ#zUK  
 if(HC_ACTION==nCode) ,GVX1B?  
 { wt9f2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 NV/paoyx:*  
   switch(wParam) 7Rtjm  
   {  ;Krs*3 s  
    case VK_MENU: (#>X*~6  
     MaskBits&=~ALTBIT; .,qh,m\Fo  
     break; iVeH\a  
    case VK_CONTROL: =kwz3Wv  
     MaskBits&=~CTRLBIT; ZoJq JWsd  
     break; GQYn |vm  
    case VK_SHIFT: ](s5 ;ta   
     MaskBits&=~SHIFTBIT; .kuNn-$  
     break; 7@gH{p1  
    default: //judge the key and send message `0U\|I#  
     break; S`  U,  
   } AHuIA{AdUR  
   for(int index=0;index<MAX_KEY;index++){ d ]|K%<+(  
    if(hCallWnd[index]==NULL) S`b!sT-sD  
     continue; A*+gWn,4Y_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kGnT4R*E  
    { kzCJs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,!^c`_Q\>@  
     bProcessed=TRUE; DS%]7,g]  
    } i qxMTH#!  
   } G+2fmVB*X  
  } ~QUNR?h  
  else if((lParam&0xc000ffff)==1){ //有键按下 2<8l&2}7]  
   switch(wParam) ^4]=D nd%  
   { :!CnGKgt  
    case VK_MENU: vdUKIP =|_  
     MaskBits|=ALTBIT; "S'Yn-  
     break; 0w TOdCvmb  
    case VK_CONTROL: d#d&CJAfr  
     MaskBits|=CTRLBIT; Ici4y*`M  
     break; K^"l.V#J  
    case VK_SHIFT: w]h8KNt  
     MaskBits|=SHIFTBIT; <a_ (qh@B  
     break; *K?UWi#$  
    default: //judge the key and send message y?r`[{L(lA  
     break; xuqG)HthRS  
   } KCZ<#ca^  
   for(int index=0;index<MAX_KEY;index++){ MK Sw  
    if(hCallWnd[index]==NULL) A+H8\ew2,  
     continue; cg]Gt1SU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m0.g}N-w  
    { eG2'W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nLk`W"irM  
     bProcessed=TRUE; J_yXL7d  
    } Z 369<  
   } Au)~"N~p?  
  } vAop#V  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 znWB.H  
   for(int index=0;index<MAX_KEY;index++){ m-~3c]pA  
    if(hCallWnd[index]==NULL) F_w+8)DZ  
     continue; AG%[?1IXW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Br<lP#u=G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )@Y< <9'2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分  yoe@]c=  
   } >tMI%r  
  } oXk6,b"  
 } =tA;JB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @U?&1.\  
} WO!OaC?+B,  
"D4% A!i  
  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: 9qGba=}Ey  
w9"~NK8xzM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); F+BCzsm7$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); T?Z&\g0yp  
"8?Fl&=Q  
  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: PC255  
6v%ePFul  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Us# /#-hJ  
{ Jwj=a1I 53  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) PMbq5  
 { (igB'S5wf  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 2g_mQT  
  SaveBmp(); 7l*vmF6Z  
  return FALSE; t3^`:T\  
 } Y+g(aak+.  
 …… //其它处理及默认处理 W)o*$c u  
} g$Vr9MH  
K(lVAKiP]  
CsT&}-C  
  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。 8vR'<_>Q  
1!U:M8T|  
  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。 @6R6.i5d  
- 3PLP$P  
  二、编程步骤 hz<TjWXv'  
}$uwAevP{y  
  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"; !OPHS^L  
O/(vimx.#F  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; h|Qb:zEP,  
>X:!Y[N  
  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; <rui\/4NJ  
cZoj|=3a  
  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; =;I+: K  
;:R2 P@6f  
  5、 添加代码,编译运行程序。 o.zP1n|G~r  
Bzt:9hr6BO  
三、程序代码 Hdd3n 6*  
/<+`4n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ?Oy0p8  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) DaGny0|BB  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ uz$p'Q  
#if _MSC_VER > 1000 NZ!I >  
#pragma once w0H#M)c  
#endif // _MSC_VER > 1000 'q}f3u>  
#ifndef __AFXWIN_H__ "j8=%J{  
#error include 'stdafx.h' before including this file for PCH \K%M.>]vq  
#endif !SnLvW89Z  
#include "resource.h" // main symbols `pDTjJ  
class CHookApp : public CWinApp s0x/2z  
{ -lv(@7o~  
 public: ~mK +Q%G5  
  CHookApp(); JqYa~6 C  
  // Overrides |:2B)X  
  // ClassWizard generated virtual function overrides i!RYrae  
  //{{AFX_VIRTUAL(CHookApp) 9OY ao  
 public: x7i<dg&  
  virtual BOOL InitInstance(); {%y|A{}c  
  virtual int ExitInstance(); _T8S4s8q  
  //}}AFX_VIRTUAL -rgdKA@)(  
  //{{AFX_MSG(CHookApp) O%F*i2I:+k  
  // NOTE - the ClassWizard will add and remove member functions here. yn<J>e  
  // DO NOT EDIT what you see in these blocks of generated code ! Ix@B*Xz:`  
  //}}AFX_MSG &u6n5-!v  
  DECLARE_MESSAGE_MAP() 0mmHN`<  
}; BxQ,T@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); U:c 0s  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vfmY >nr  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); asmu<  
BOOL InitHotkey(); vo&h6'i>7  
BOOL UnInit(); >w.%KVBJ  
#endif ,Sy& ?t}`  
e0Gs|c+6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. }ALli0n`V)  
#include "stdafx.h" `cN8AcRHP  
#include "hook.h" tuuwoiQ*`  
#include <windowsx.h> 1 Qz@  
#ifdef _DEBUG '<1Cta`  
#define new DEBUG_NEW q0vZR"y  
#undef THIS_FILE Y(?SE< 4R  
static char THIS_FILE[] = __FILE__; F`{O  
#endif e:.?T\  
#define MAX_KEY 100 .ns=jp  
#define CTRLBIT 0x04 J}#2Wy^{  
#define ALTBIT 0x02 # kNp);  
#define SHIFTBIT 0x01 U&a(WQV9&  
#pragma data_seg("shareddata") rw gj]  
HHOOK hHook =NULL; [*0M$4  
UINT nHookCount =0; Zt=P 0  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey <$25kb R5K  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT hH%fWB2(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey fy|I3  
static int KeyCount =0; ,\#s_N 7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]\L+]+u~  
#pragma data_seg() b^ [ z'  
HINSTANCE hins; +Kg }R5+  
void VerifyWindow(); X6qgApyE  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) koD}o^U#  
//{{AFX_MSG_MAP(CHookApp) |90X_6(  
// NOTE - the ClassWizard will add and remove mapping macros here. gOah5*Lj  
// DO NOT EDIT what you see in these blocks of generated code! 9e vQQN6D|  
//}}AFX_MSG_MAP aD_7^8>  
END_MESSAGE_MAP() nXI8`7D  
+/]*ChrS  
CHookApp::CHookApp() A:yql`&s  
{ $\~cWpv  
 // TODO: add construction code here, R(cg`8  
 // Place all significant initialization in InitInstance {Ja(+NQ  
} zn_#}}e;G  
]IeLKcn  
CHookApp theApp; %f1IV(3Qc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bw7gL\*  
{ M_2>b:#A*  
 BOOL bProcessed=FALSE; ;f N^MW@&[  
 if(HC_ACTION==nCode) <8Nr;96IA  
 { k%kEW%I yG  
  if((lParam&0xc0000000)==0xc0000000){// Key up ]+B.=mO_  
   switch(wParam) E'(nJ  
   { khD)x0'b  
    case VK_MENU: t+]1D@hv  
     MaskBits&=~ALTBIT; _9p79S<+  
     break; ki/Cpfq40*  
    case VK_CONTROL: 8c_X`0jy  
     MaskBits&=~CTRLBIT; 3G2iRr.o  
     break; ^Qn:#O9  
    case VK_SHIFT: #M+_Lk3  
     MaskBits&=~SHIFTBIT; t*A[v  
     break; M5t.l (  
    default: //judge the key and send message EBz4k)@m  
     break; iXL^[/}&?M  
   } :M f8q!Q'  
   for(int index=0;index<MAX_KEY;index++){ cs9h\]ZA  
    if(hCallWnd[index]==NULL) kN8B,  
     continue; r)K5<[\r  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }Q]-Y :  
    { UwF-*(#41  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p|mFF0SL  
     bProcessed=TRUE; rXE0jTf:a  
    } 6akI5\b  
   } dC-~=}HR^  
  } 4dLnX3 v  
  else if((lParam&0xc000ffff)==1){ //Key down BT_XqO  
   switch(wParam) m.1-[2{8~  
   { %iEdUV\$  
    case VK_MENU: 0chpC)#Q3;  
     MaskBits|=ALTBIT; Tcc83_Iq  
     break; P3Lsfi.  
    case VK_CONTROL: x a<KF  
     MaskBits|=CTRLBIT; c_M[>#`  
     break; V@b7$z  
    case VK_SHIFT: X"r.*fb;N  
     MaskBits|=SHIFTBIT; DLqH*U  
     break; F'|e:h  
    default: //judge the key and send message e.%I#rNI  
     break; ~9yK MUf  
   } 5y\35kT'  
   for(int index=0;index<MAX_KEY;index++) {Q_GJ  
   { 0j6b5<Gpc*  
    if(hCallWnd[index]==NULL) wQjYH!u,YZ  
     continue; xU0iz{9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I9>vm]  
    { K@g ~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .35~+aqC  
     bProcessed=TRUE; ~ho,bwJM[T  
    } >3KlI  
   } l>pB\<LL  
  } i$@xb_  
  if(!bProcessed){ {k-_+#W"  
   for(int index=0;index<MAX_KEY;index++){ F~ \ONO5  
    if(hCallWnd[index]==NULL) }zsIp,  
     continue; +_cigxpTc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ipp`99  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #0uu19+}  
   } 1hgIR^;[b  
  } a{^z= =  
 } Zy;jp*Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); mI4GBp  
} vN],9 q  
|9]-_a  
BOOL InitHotkey() qCfEv4  
{ r,0D I  
 if(hHook!=NULL){ 24? _k]Y  
  nHookCount++; i7r)9^y  
  return TRUE; )$9w Kk\F  
 } 7sOAaWx  
 else ~K3Lbd| r  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); V*Fy@  
  if(hHook!=NULL) hLgX0QV  
   nHookCount++; #-G@p  
  return (hHook!=NULL); C=q&S6/+  
}  ~,&8)1  
BOOL UnInit() % R25,  V  
{ 8w:mL^6x  
 if(nHookCount>1){ Dbj?l;'1  
  nHookCount--; @S}j=k  
  return TRUE; Ua 6O~,\  
 } H%U  
 BOOL unhooked = UnhookWindowsHookEx(hHook); {S9gOg  
 if(unhooked==TRUE){ 9=]HOUn  
  nHookCount=0;  ov,  
  hHook=NULL; L%5y@b{AR  
 } OF']-  
 return unhooked; mIYKzu_k=  
} c|9g=DjK  
Ew PJ|Z^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XdV>6<gf{  
{ ~zac.:a8  
 BOOL bAdded=FALSE; juWXB+d2Y  
 for(int index=0;index<MAX_KEY;index++){ 9D=X3{be#  
  if(hCallWnd[index]==0){ ^ [m-PS(  
   hCallWnd[index]=hWnd; dO1 m  
   HotKey[index]=cKey; <|Lz#iV37  
   HotKeyMask[index]=cMask; L3wj vq^  
   bAdded=TRUE; HP[B%  
   KeyCount++; Kn5C  
   break; VgYy7\?p  
  } K3 BWj33  
 } b' M"To@  
 return bAdded; :KX*j$5U  
} z,m3U(  
`V V >AA5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) O*?^a7Z)4  
{ 5p!{#r6m  
 BOOL bRemoved=FALSE; E8sM`2z5  
 for(int index=0;index<MAX_KEY;index++){ WeH_1$n5  
  if(hCallWnd[index]==hWnd){ pn(i18 x  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ i7h^L)M  
    hCallWnd[index]=NULL; oowofi(E  
    HotKey[index]=0; 4+ d(d  
    HotKeyMask[index]=0; .Er+*j;&w  
    bRemoved=TRUE; D60quEe3%  
    KeyCount--; @"fv[=Xb  
    break; B\rY\  
   } yY UAH-  
  } -th.(eAx  
 } 0.R3(O  
 return bRemoved; ]Bf1p  
} 2RNee@!JJP  
2oahQ: }B  
void VerifyWindow() UQh.o   
{ a9NuYYr,h  
 for(int i=0;i<MAX_KEY;i++){ Z|a*"@5_  
  if(hCallWnd!=NULL){ wj}LVyV  
   if(!IsWindow(hCallWnd)){ {4 vWSb  
    hCallWnd=NULL; jA:'P~`Hj  
    HotKey=0; jsgDJ}  
    HotKeyMask=0; (oy@j{G)c6  
    KeyCount--; =d5;F`m  
   } l{8O'4;  
  } C,> n  
 } u?SwGXi~8  
} RY)x"\D  
pwHe&7e#  
BOOL CHookApp::InitInstance() RE4#a 2  
{ .bp#YU,m  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); -;"A\2_y  
 hins=AfxGetInstanceHandle(); 7)#JrpTj%  
 InitHotkey(); _,K[kVn  
 return CWinApp::InitInstance(); X}3?k<m  
} LHZsmUM(dg  
kkHK~(>G  
int CHookApp::ExitInstance() W!XBuk-  
{ _IU5HT}2  
 VerifyWindow(); z@19gD#8  
 UnInit(); u|$HA>F[  
 return CWinApp::ExitInstance(); Er@xrhH  
} [N4N7yF  
R'B_YKHBY  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ex_dqko  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) E,?IIRg&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^5~x*=_  
#if _MSC_VER > 1000 8kU(>' ^_:  
#pragma once pl,XS6mB  
#endif // _MSC_VER > 1000 n>Oze7hVY  
8|i<4>  
class CCaptureDlg : public CDialog V:5aq.o!  
{ |p*cI @  
 // Construction XHgW9;M!  
 public: A-myY30  
  BOOL bTray; s-SFu  
  BOOL bRegistered; SufM ~9Ll  
  BOOL RegisterHotkey(); 45%D^~2~F  
  UCHAR cKey; INk|NEX  
  UCHAR cMask; M{)eA<6  
  void DeleteIcon(); ircL/:  
  void AddIcon(); ]QHZ [C  
  UINT nCount; 2'W# x  
  void SaveBmp(); ;QG8@ms|  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor vzSjfv  
  // Dialog Data gxI/MD~!>  
  //{{AFX_DATA(CCaptureDlg) L5d YTLY  
  enum { IDD = IDD_CAPTURE_DIALOG }; G;/> N'#  
  CComboBox m_Key; M!gu`@@}F  
  BOOL m_bControl; w0sy@OF  
  BOOL m_bAlt; 6yYd~|T.Fl  
  BOOL m_bShift; nHXPEbq-g  
  CString m_Path; ^a3 (QKS  
  CString m_Number; rWO#h{  
  //}}AFX_DATA Jz&dC  
  // ClassWizard generated virtual function overrides "k"+qR`fH  
  //{{AFX_VIRTUAL(CCaptureDlg) 3ErV" R4"$  
 public: 2|RxowXZ"  
  virtual BOOL PreTranslateMessage(MSG* pMsg); T51oNO%^  
 protected: q]!FFi{w;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support I) *J,hs1  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J- l[dC  
  //}}AFX_VIRTUAL $OGMw+$C ^  
  // Implementation eo!+UFZbY  
 protected: l_2l/ff9  
  HICON m_hIcon; ^pfM/LQ@  
  // Generated message map functions SZ4@GK  
  //{{AFX_MSG(CCaptureDlg) @LU[po1I  
  virtual BOOL OnInitDialog(); jt3W.^6HO  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); q~AvxO  
  afx_msg void OnPaint(); }VH2G94Ll  
  afx_msg HCURSOR OnQueryDragIcon(); 0T$`;~  
  virtual void OnCancel(); T{#=A$vu  
  afx_msg void OnAbout(); `-W4/7  
  afx_msg void OnBrowse(); 8) `  
  afx_msg void OnChange(); ">fRM=fl  
 //}}AFX_MSG & }"I!  
 DECLARE_MESSAGE_MAP() >: @\SU  
}; %>O}bdSf  
#endif #=m:>Q?%z  
:}SR{}]yXs  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `C6,**`R$k  
#include "stdafx.h" cZWW[i  
#include "Capture.h" [c=![ *}/  
#include "CaptureDlg.h" yM-%x1r ~  
#include <windowsx.h> IL*MB;0>  
#pragma comment(lib,"hook.lib") X0$?$ ta  
#ifdef _DEBUG 98{n6$\  
#define new DEBUG_NEW Ut2x4$9  
#undef THIS_FILE jM'Fb.>~  
static char THIS_FILE[] = __FILE__; Fk`6 q  
#endif p1z^i(  
#define IDM_SHELL WM_USER+1 oye/tEMG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GsqO^SV  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AZJ|.mV q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ) I.uqG  
class CAboutDlg : public CDialog G6"4JTWO  
{ %+ MYg^  
 public: f+c{<fX  
  CAboutDlg(); )B5U0iIi  
  // Dialog Data ~;wR}s<}(  
  //{{AFX_DATA(CAboutDlg) Q6[h;lzGV  
  enum { IDD = IDD_ABOUTBOX }; =D 5!Xq'|  
  //}}AFX_DATA 1<M~ #  
  // ClassWizard generated virtual function overrides kw1Lm1C  
  //{{AFX_VIRTUAL(CAboutDlg) "1ZVuI  
 protected: JQ\o[t  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _p+q)#.W  
  //}}AFX_VIRTUAL 2l8z/o7v  
  // Implementation 5pE@Ww  
 protected: wqXo]dX  
  //{{AFX_MSG(CAboutDlg) lWU? R  
  //}}AFX_MSG "9H#pj -  
  DECLARE_MESSAGE_MAP() \'nE{  
}; ~^eC?F(  
g aXF3v*j  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) @hOY&  
{ 4-xg+*()  
 //{{AFX_DATA_INIT(CAboutDlg) a'\fS7aE0l  
 //}}AFX_DATA_INIT ^`(3X  
} ^F/H?V/PX  
dC">AW  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4+0:(=>[%  
{ Qhn>aeW,  
 CDialog::DoDataExchange(pDX); \88 IFE  
 //{{AFX_DATA_MAP(CAboutDlg) `XbV*{7  
 //}}AFX_DATA_MAP ?)+I'lW!  
} SjU0X b)[  
<ZeZq  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E`3[62C  
 //{{AFX_MSG_MAP(CAboutDlg) fAeq(tI=  
 // No message handlers DzvGR)>/  
 //}}AFX_MSG_MAP T(eNK c2  
END_MESSAGE_MAP() l8!n!sC[,  
HBgt!D0MZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Pexg"328  
: CDialog(CCaptureDlg::IDD, pParent) sMb+4{W&6  
{ qVJC O-K|  
 //{{AFX_DATA_INIT(CCaptureDlg) *s"{JrG`O  
  m_bControl = FALSE; 32):&X"AIh  
  m_bAlt = FALSE; EXbhyg  
  m_bShift = FALSE;  0GiL(e|  
  m_Path = _T("c:\\"); @X0$X+]E*8  
  m_Number = _T("0 picture captured."); l,M?   
  nCount=0; Qc"UTvq  
  bRegistered=FALSE; 9m_Hm')VG  
  bTray=FALSE; GVzG  
 //}}AFX_DATA_INIT PF/eQZ*4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >I.X]<jI  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]1n =O"vE  
} rM(2RI4O`0  
^0&   
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?e!mv}B_  
{ OX)[?1m8  
 CDialog::DoDataExchange(pDX); M&K'5G)7  
 //{{AFX_DATA_MAP(CCaptureDlg) m]:|j[!*M  
  DDX_Control(pDX, IDC_KEY, m_Key); TW?A/GoXI  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); xD<:'-ri>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); |Orp:e!  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 2q.J1:lW  
  DDX_Text(pDX, IDC_PATH, m_Path); bIahjxd:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); RI jz7ZG  
 //}}AFX_DATA_MAP }zu?SZH  
} 2_lb +@[W  
:Sd iG=t  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 0')O4IHH  
//{{AFX_MSG_MAP(CCaptureDlg) MHkTN  
 ON_WM_SYSCOMMAND() E"$AOM?(*i  
 ON_WM_PAINT() z>X<Di&x)  
 ON_WM_QUERYDRAGICON() |/-H:\5  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) StJ&YYdD  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^X/[x]UOT@  
 ON_BN_CLICKED(ID_CHANGE, OnChange) H$i4OQ2  
//}}AFX_MSG_MAP 8P= z"y  
END_MESSAGE_MAP() Dy_Za.N2  
!B &%!06  
BOOL CCaptureDlg::OnInitDialog()  &(Ot(.  
{ X!%CYmIRb  
 CDialog::OnInitDialog(); xr*hmp1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); o3~ecJ?k  
 ASSERT(IDM_ABOUTBOX < 0xF000); NiQ_0Y}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Una7O]  
 if (pSysMenu != NULL) c~a:i=y67  
 { co$I htOv  
  CString strAboutMenu; 0HRLTgIC  
  strAboutMenu.LoadString(IDS_ABOUTBOX); \]eB(&nq  
  if (!strAboutMenu.IsEmpty()) ,f;YJHEx8  
  { H#l uG_)  
   pSysMenu->AppendMenu(MF_SEPARATOR); ({}JvSn1  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Z&!5'_9{V  
  } -~-BQ!!(  
 }  k_;+z  
 SetIcon(m_hIcon, TRUE); // Set big icon Z;6v`;[  
 SetIcon(m_hIcon, FALSE); // Set small icon q;p:)Q"  
 m_Key.SetCurSel(0); l |c#  
 RegisterHotkey(); OTNcNY  
 CMenu* pMenu=GetSystemMenu(FALSE); 7]w]i5  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "[ 091<  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,s*-2Sz  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); s6|Ev IVM  
 return TRUE; // return TRUE unless you set the focus to a control o0Y {k8  
} O]SjShp  
(c<MyuWb  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) !vB8Pk"  
{ cZ{-h  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) CXr]V"X9  
 { G G]4g)O5  
  CAboutDlg dlgAbout; qd=&*?  
  dlgAbout.DoModal(); _{fh/{b1  
 } M7|k"iz v  
 else o+o'!)  
 { ([y2x.kd  
  CDialog::OnSysCommand(nID, lParam); t<Iy `r7 1  
 } 2aef[TY  
} 06FBI?;|=  
XANPI|  
void CCaptureDlg::OnPaint() ,,hW|CmN30  
{ &> Myf@  
 if (IsIconic()) FOAy'76p  
 { Gm 0&y  
  CPaintDC dc(this); // device context for painting bn b:4?d]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3_:J`xX(4  
  // Center icon in client rectangle @pcmVsIp  
  int cxIcon = GetSystemMetrics(SM_CXICON); 66G$5  
  int cyIcon = GetSystemMetrics(SM_CYICON); a9hK8e  
  CRect rect; o& g0 1t  
  GetClientRect(&rect); .""?k[f5Q  
  int x = (rect.Width() - cxIcon + 1) / 2; h/7m.p]  
  int y = (rect.Height() - cyIcon + 1) / 2; 5E|y5|8fb  
  // Draw the icon gr?[KD l~  
  dc.DrawIcon(x, y, m_hIcon); rq;Xcc  
 } 3dlL?+Y#  
 else HAof,* h$  
 { T) ZO+}  
  CDialog::OnPaint(); ,P&.qg i=(  
 } ?U\@?@  
} hmfO\gc}y  
9A@/5Z:v5W  
HCURSOR CCaptureDlg::OnQueryDragIcon() E;Akm':  
{ yMdE[/+3  
 return (HCURSOR) m_hIcon; ;<j[0~qp:  
} Y7TW_[_u  
k}xXja*  
void CCaptureDlg::OnCancel() A2fc_A/a  
{ ~C|. .Z  
 if(bTray) bqmb|mD  
  DeleteIcon(); oCw>b]S  
  CDialog::OnCancel(); O#j&8hQ>  
} zGDLF`  
u0&QStI  
void CCaptureDlg::OnAbout() z}'-gv\,  
{ 7+!4pf  
 CAboutDlg dlg; !p&[:+qN  
 dlg.DoModal(); Bu[sSoA  
} MLbmz\8a  
4f)B@A-  
void CCaptureDlg::OnBrowse() qL;OE.?oA  
{ Oz3JMZe  
 CString str; q5@N//<DNN  
 BROWSEINFO bi; fi |k)  
 char name[MAX_PATH]; Rm i4ZPb.  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d:j65yu  
 bi.hwndOwner=GetSafeHwnd(); 0Nvk|uI V[  
 bi.pszDisplayName=name; Ol%KXq[  
 bi.lpszTitle="Select folder"; eflmD$]SW  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; qK_jgj=w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~AqFLv/%  
 if(idl==NULL) rKhhx   
  return; dF@m4U@L  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); zl a^j,  
 str.ReleaseBuffer(); 6cO3 6  
 m_Path=str; M<nKk#!+h  
 if(str.GetAt(str.GetLength()-1)!='\\') 3} Xf  
  m_Path+="\\"; /AT2<w  
 UpdateData(FALSE); 9oe=*#Ig1m  
} |Ok@:Au  
%< ^IAMkp  
void CCaptureDlg::SaveBmp() r]sN I[  
{ CXI%8eFXe$  
 CDC dc; ;hz;|\ko5  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); JX.3b_O  
 CBitmap bm; zwLJ|>  
 int Width=GetSystemMetrics(SM_CXSCREEN); zs=[C+Z\  
 int Height=GetSystemMetrics(SM_CYSCREEN); yH9(ru  
 bm.CreateCompatibleBitmap(&dc,Width,Height); }0y2k7^]  
 CDC tdc; jTeHI|b  
 tdc.CreateCompatibleDC(&dc); O`M 6 =\  
 CBitmap*pOld=tdc.SelectObject(&bm); Lrrc&;  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); n'5LY9"  
 tdc.SelectObject(pOld); _A>?@3La9  
 BITMAP btm; bjO?k54I  
 bm.GetBitmap(&btm); =._V$:a6o  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 4#^E$N:  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); L?Fb}  
 BITMAPINFOHEADER bih; eBZ94rA]  
 bih.biBitCount=btm.bmBitsPixel; Wx:He8N] H  
 bih.biClrImportant=0; pO_$8=G+  
 bih.biClrUsed=0; J,W<vrKOcN  
 bih.biCompression=0; iAl.(j  
 bih.biHeight=btm.bmHeight; *!m\%*y{  
 bih.biPlanes=1; 85}S8\_u  
 bih.biSize=sizeof(BITMAPINFOHEADER); K Y=$RO  
 bih.biSizeImage=size; "hbCP4  
 bih.biWidth=btm.bmWidth; ,pTj'I  
 bih.biXPelsPerMeter=0; 59@PY!c>  
 bih.biYPelsPerMeter=0; T4JG5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =$w QA  
 static int filecount=0; _k|k$qxE  
 CString name; ?niv}/'%O  
 name.Format("pict%04d.bmp",filecount++); u6t%*''  
 name=m_Path+name; ] >4CBm$  
 BITMAPFILEHEADER bfh; ]YciLc(  
 bfh.bfReserved1=bfh.bfReserved2=0; <Od5}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )Y](Mj!D  
 bfh.bfSize=54+size; B<Zm'hdX  
 bfh.bfOffBits=54; gj@>9  
 CFile bf; CZzgPId%x  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ GzN /0:b  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .gJv})Vi  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  r .`&z  
  bf.WriteHuge(lpData,size); %_L~"E 2e  
  bf.Close(); j9 d^8)O,  
  nCount++; e#<A\?  
 } O:{N5+HVG  
 GlobalFreePtr(lpData); [W8"Mc|ve  
 if(nCount==1) tJa*(%Z?f  
  m_Number.Format("%d picture captured.",nCount); :5#iVa#<  
 else [sXn B$  
  m_Number.Format("%d pictures captured.",nCount); NtDxwzj  
  UpdateData(FALSE); }nK=~Wcu\  
} ;39~G T  
<ht^Ck  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) f5`q9w_c  
{ T!2gOe  
 if(pMsg -> message == WM_KEYDOWN) -\[&<o@/D  
 { 2~ y<l  
  if(pMsg -> wParam == VK_ESCAPE) #GfM!<q<  
   return TRUE; U:fGIEz{ZY  
  if(pMsg -> wParam == VK_RETURN) Qm)c!  
   return TRUE; \B Uno6  
 } 6[3>[ej:x  
 return CDialog::PreTranslateMessage(pMsg); ,c&%/"i:w  
} FwpTQix!  
) :st-I!o  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ro.br:'Bw  
{ tpn.\z%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ >*1YL)DBT\  
  SaveBmp(); Z&6*8#wn  
  return FALSE; ZPlY]e  
} e% #?B *  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~93#L_V_O  
 CMenu pop; i{7Vh0n3S-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); M=sGPPj  
 CMenu*pMenu=pop.GetSubMenu(0); -1%AM40j  
 pMenu->SetDefaultItem(ID_EXITICON); wqF_hs(O  
 CPoint pt; P0l.sVqL  
 GetCursorPos(&pt); D9r4oRkP*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2&0#'Tb  
 if(id==ID_EXITICON) 2rrC y C  
  DeleteIcon(); Z!z#+G  
 else if(id==ID_EXIT) D"<>! ]@(a  
  OnCancel(); m/"}Y]n!  
 return FALSE; om1D}irKT  
} ~kOXMLRg  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); |5(un/-C  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 4<S=KFT_  
 AddIcon(); ,H@ x.  
 return res; }UWi[UgA  
} blmY=/]  
/MbWS(RT  
void CCaptureDlg::AddIcon() 5iZ;7 ?(  
{ ;edt["Eu  
 NOTIFYICONDATA data; "q7pkxEuJ  
 data.cbSize=sizeof(NOTIFYICONDATA); [g@ .dr3t  
 CString tip; _YA;Nd#%k  
 tip.LoadString(IDS_ICONTIP); !4}Wp.  
 data.hIcon=GetIcon(0); Jzj>=jWX@  
 data.hWnd=GetSafeHwnd(); +|.6xC7U  
 strcpy(data.szTip,tip); g]PC6xr38  
 data.uCallbackMessage=IDM_SHELL; 2T-3rC)  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 8C5*:x9l  
 data.uID=98; t}2M8ue(&  
 Shell_NotifyIcon(NIM_ADD,&data); ,H5o/qNU`{  
 ShowWindow(SW_HIDE); (2'q~Z+>'  
 bTray=TRUE; Ta)6ly7'  
} gjPbhY=C[  
f=Kt[|%'e  
void CCaptureDlg::DeleteIcon() N3|aNQ=X0  
{ DX<xkS[P  
 NOTIFYICONDATA data; vve[.Lud'  
 data.cbSize=sizeof(NOTIFYICONDATA); Rqun}v}  
 data.hWnd=GetSafeHwnd(); ke5_lr(  
 data.uID=98; l/6(V:  
 Shell_NotifyIcon(NIM_DELETE,&data); &h?8yV4B  
 ShowWindow(SW_SHOW); ($s%B  
 SetForegroundWindow(); =f=,YcRn+  
 ShowWindow(SW_SHOWNORMAL); sXR}#*8p  
 bTray=FALSE; rB-}<22.  
} "kg?Or.  
3.D|xE]g  
void CCaptureDlg::OnChange() +KHk`2{y~  
{ !kWx'tJ$  
 RegisterHotkey(); H >1mi_1  
} .ot[_*A.FD  
(!dwUB  
BOOL CCaptureDlg::RegisterHotkey() rtk1 8U-  
{ LO;Z3Q>#0  
 UpdateData(); y3NMt6  
 UCHAR mask=0; X{;3gN  
 UCHAR key=0; Y%YPR=j~ &  
 if(m_bControl) RiCzH  
  mask|=4; XFcIBWS  
 if(m_bAlt) nISfRXU;  
  mask|=2; d;LBV<Z?  
 if(m_bShift) & <Jvaf_=  
  mask|=1; OojQG  
  key=Key_Table[m_Key.GetCurSel()]; o3xfif  
 if(bRegistered){ QTuj v<|  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5: O,-b&  
  bRegistered=FALSE; ^|h})OHV  
 } 4P$#m<;t  
 cMask=mask; P] 9-+  
 cKey=key; U\`H0'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Zmr*$,v<y  
 return bRegistered; jBnvu@K"  
} P1}Fn:Xe%7  
2 NrMse  
  四、小结 ]QK@zb}x  
D4W^{/S  
  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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