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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: _$_,r H  
  4*'ZabDD  
  一、实现方法 q.VZP  
6TDa#k5v  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:  kMZo7 y  
wOg#J  
#pragma data_seg("shareddata") @%jY  
HHOOK hHook =NULL; //钩子句柄 jo' V.]\  
UINT nHookCount =0; //挂接的程序数目 ;FJFr*PM  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ; )FmN[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Q^*4FH!W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey c#-*]6x  
static int KeyCount =0; ?x/Lb*a^  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Clb7=@f  
#pragma data_seg() N}nE?|N=5  
t;`ULp~&  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 1zgM$p  
,Xxp]*K2  
  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: re4A5Ev$  
5Q\ hd*+g  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 4~1lP&  
cKey,UCHAR cMask) 9_O6Sl  
{ "RTv[n!  
 BOOL bAdded=FALSE; L;WFHIE  
 for(int index=0;index<MAX_KEY;index++){ b=5ZfhIg[  
  if(hCallWnd[index]==0){ ]=PkgOJD  
   hCallWnd[index]=hWnd; Hb/8X !=  
   HotKey[index]=cKey; -A@/cS%p  
   HotKeyMask[index]=cMask; 1 @i/N  
   bAdded=TRUE; =RAojoN  
   KeyCount++; WL?qulC}h1  
   break; #r/5!*3  
  } OZA^L;#>  
 } yb,X }"Et  
 return bAdded; :| !5d{8S8  
} %=$Knc_!T^  
//删除热键 BwrX.!M  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) o/ 7[ G  
{ wbvOf X  
 BOOL bRemoved=FALSE; |*DkriYY  
 for(int index=0;index<MAX_KEY;index++){ HYL['B?Wid  
  if(hCallWnd[index]==hWnd){ FmhAUe  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4Y1dkg1y  
    hCallWnd[index]=NULL; E]}_hZU  
    HotKey[index]=0; 0 vYG#S  
    HotKeyMask[index]=0; e ^,IZ{  
    bRemoved=TRUE; *(qj!U43  
    KeyCount--; y` {|D*  
    break; jz]}%O  
   } *tv\5KW G  
  } ~FQHT?DAo  
 } ]s!id[j  
 return bRemoved; Y`(~eNX^%  
} ?rA3<j  
/]U;7)  
{> <1K6t  
  DLL中的钩子函数如下: z~==7:Os  
ve:Oe{Ie{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wph8ln"C-  
{ `HO] kJpX  
 BOOL bProcessed=FALSE; $ 7W5smW/  
 if(HC_ACTION==nCode) !v(^wqna\  
 { \<\H1;=.@'  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 B:Ft(,  
   switch(wParam) X6T[+]Gc  
   {  IUDH"~f  
    case VK_MENU: |a a\t  
     MaskBits&=~ALTBIT; _/'VD!(MV  
     break; H  XFY  
    case VK_CONTROL: \I-e{'h  
     MaskBits&=~CTRLBIT; N  /'  
     break; tC(MaI  
    case VK_SHIFT: >*opEI+  
     MaskBits&=~SHIFTBIT; \*'@F+  
     break; Jm#p!G+  
    default: //judge the key and send message >3pT).wH|M  
     break; 9_nbMs   
   } LnKgT1  
   for(int index=0;index<MAX_KEY;index++){ v+[S${  
    if(hCallWnd[index]==NULL)  S,ea[$_  
     continue; )QRT/, ;c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W$2 \GPJt  
    { PTLlLa85<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )Tp"l"(G  
     bProcessed=TRUE; l qwy5#  
    } bJ 2>@|3*  
   } ,msP(*qoI  
  } Rd5-ao4  
  else if((lParam&0xc000ffff)==1){ //有键按下 dP(.l}O  
   switch(wParam) 6wj o:I  
   { $5.52  
    case VK_MENU:  }( CYok  
     MaskBits|=ALTBIT; -CuuO=h  
     break; 71Za!3+  
    case VK_CONTROL: }Hq3]LVE  
     MaskBits|=CTRLBIT; 6W{Nw<  
     break; od5nRb  
    case VK_SHIFT: /} z9(  
     MaskBits|=SHIFTBIT; fP5i3[T  
     break; 3)ox8,{%}  
    default: //judge the key and send message ?jUgDwc(w  
     break; [Z"Z5e`  
   } `B4Ilh"d  
   for(int index=0;index<MAX_KEY;index++){ `4snTM!v&  
    if(hCallWnd[index]==NULL) xw_klHL-o  
     continue; i&^JG/a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :$k1I-^R  
    { 2uN3:_w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); - _ 8-i1?  
     bProcessed=TRUE; XHj%U  
    } >r7PK45.K  
   } 8s2y!pn7Q  
  } _u^3uzu  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [j5+PV  
   for(int index=0;index<MAX_KEY;index++){ :Ae#+([V  
    if(hCallWnd[index]==NULL) 6H: fg  
     continue; .\T!oSb4[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 3@\/5I xn  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); $Wj{B@k  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 8 yi#] 5`Q  
   } }T(=tfv@  
  } cZ|NGkZ  
 } &g&,~Y/z;  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ~cSXBc,+  
} j0~am,yZ  
M1Ff ,]w  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: uA[ :  
}xt^}:D  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); bRyxP2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <=GZm}/]N  
k<Gmb~Tg1  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 0$c(<+D  
b way+lh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) HVoP J!K3  
{ ZCj1Cz]"l<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ><D2of|  
 { iTq&h=(n  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0C%IdV%CU  
  SaveBmp(); Z81;Y=(  
  return FALSE; #J3o~,t<  
 } B E8_.>  
 …… //其它处理及默认处理 }(!Uq  
} B-w`mcqp$  
{g1"{  
_,60pr3D'  
  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。 dWkQ NFKF  
IMbF]6%p(  
  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。 aWJ BYw6{L  
c8[kL$b;j  
  二、编程步骤 68h1Wjg:"!  
y7:f^4  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; '+{yg+#/wV  
9q$^x/z!  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Xwo+iZ(a  
s<#BxN  
  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; O&aD]~|  
DoFe:+_U3  
  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; mxF+Fp~  
)@I] Rk?  
  5、 添加代码,编译运行程序。 ~<<32t'S:  
TA/hj>rV  
三、程序代码 W[DoQ @q  
\^9n&MonM  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL WO9vOS>  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) "IQYy~ /  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :Ob^b3<t  
#if _MSC_VER > 1000 cq?,v?m  
#pragma once ~D}fy  
#endif // _MSC_VER > 1000 AEnkx!o  
#ifndef __AFXWIN_H__ v&;JVai  
#error include 'stdafx.h' before including this file for PCH u(8{5"C  
#endif ;}f {o^]'  
#include "resource.h" // main symbols 7K.],eo0  
class CHookApp : public CWinApp "#gKI/[qxq  
{ BaI-ve  
 public: ga\ s5  
  CHookApp(); tzd !r7  
  // Overrides [Q8Wy/o Q  
  // ClassWizard generated virtual function overrides Hpz1Iy @  
  //{{AFX_VIRTUAL(CHookApp) m?yztm~u  
 public: w<THPFFF"  
  virtual BOOL InitInstance(); {ixKc  
  virtual int ExitInstance(); HU/4K7e`  
  //}}AFX_VIRTUAL G7`mK}J7  
  //{{AFX_MSG(CHookApp) q({-C  
  // NOTE - the ClassWizard will add and remove member functions here. w/ZP. B  
  // DO NOT EDIT what you see in these blocks of generated code ! TAOsg0  
  //}}AFX_MSG OhN2FkxL  
  DECLARE_MESSAGE_MAP() ^4 ,LIIUj  
}; DeW{#c6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ! jAp V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1>\V>g9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u@:[ dbJ  
BOOL InitHotkey(); 4zhh **]B  
BOOL UnInit(); 'j{o!T0  
#endif Hp ;$fQ  
K/Y"oQ2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. iuXXFuh  
#include "stdafx.h" o-&0_Zq_  
#include "hook.h" p>J@"?%^  
#include <windowsx.h> (U$;0`  
#ifdef _DEBUG N<4 nb  
#define new DEBUG_NEW 98 NFJ  
#undef THIS_FILE V8WSJ=-&  
static char THIS_FILE[] = __FILE__; AZik:C"Q  
#endif [+W<;iep  
#define MAX_KEY 100 Yc6.v8a  
#define CTRLBIT 0x04 ~;]zEq-hG  
#define ALTBIT 0x02 Z Q*hrgQ  
#define SHIFTBIT 0x01 =a+  } 6  
#pragma data_seg("shareddata") m}D;=>2$  
HHOOK hHook =NULL; -~JYfj@  
UINT nHookCount =0; -e0[$v  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey :|ah u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT J9XH8Grk-  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ojm IEzsz  
static int KeyCount =0; #1*7eANfr  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Y d~J(  
#pragma data_seg() IaO R%B g  
HINSTANCE hins; stW G`>X  
void VerifyWindow(); K8 [Um!(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g2==`f!i  
//{{AFX_MSG_MAP(CHookApp) [742s]j  
// NOTE - the ClassWizard will add and remove mapping macros here. >)diXe}j  
// DO NOT EDIT what you see in these blocks of generated code! A1Uy|Dl  
//}}AFX_MSG_MAP 2)0J@r'  
END_MESSAGE_MAP() tEo-Mj5:  
:HrFbq  
CHookApp::CHookApp() ?>V>6cDQ  
{ !kb:g]X  
 // TODO: add construction code here, I][&*V1  
 // Place all significant initialization in InitInstance Np$&8v+en  
} S!gzmkGcj  
dXM8iP  
CHookApp theApp; d@a<Eq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /|H9Gm  
{ a(?)r[=  
 BOOL bProcessed=FALSE; (.Ak*  
 if(HC_ACTION==nCode) Dyo^O=0c  
 { Uz rf,I[  
  if((lParam&0xc0000000)==0xc0000000){// Key up 84e8z{  
   switch(wParam) #6D>e~>n  
   { C'gv#!Q  
    case VK_MENU: kkb+qo  
     MaskBits&=~ALTBIT; /hVwrt(  
     break; ]&D= *:c  
    case VK_CONTROL: 3}mg7KV&  
     MaskBits&=~CTRLBIT; ir{ 4k  
     break; I 2OQ  
    case VK_SHIFT: IDos4nM27]  
     MaskBits&=~SHIFTBIT; yk5K8D[tV  
     break; 2.MUQ;OX  
    default: //judge the key and send message m0h,!  
     break; BaIuOZ@,  
   } Qhc; Zl  
   for(int index=0;index<MAX_KEY;index++){ +U_1B%e(%  
    if(hCallWnd[index]==NULL) uCuB>x&  
     continue; LdNpb;*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) p-EU"O  
    { TKGaGMx6@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); G'w!Aw s  
     bProcessed=TRUE; fXl2i]L(^B  
    } >D~8iuy]8.  
   } @0t[7Nv-1  
  } C^B$_?  
  else if((lParam&0xc000ffff)==1){ //Key down Lq;iR  
   switch(wParam) <BZC5b6  
   { L1(-xNUo_i  
    case VK_MENU: GU@#\3  
     MaskBits|=ALTBIT; z;<~j=lP  
     break; E7@Gpu,o  
    case VK_CONTROL: lfC]!=2%~8  
     MaskBits|=CTRLBIT; !P^Mo> "  
     break; ]plp.f#av  
    case VK_SHIFT: zP2X}VLMo  
     MaskBits|=SHIFTBIT; qs bo"29  
     break; Mb\(52`)Q  
    default: //judge the key and send message NqOX);'L0  
     break; } -;)G~h/"  
   } ]Z6? m  
   for(int index=0;index<MAX_KEY;index++) oxL<\4)WJ  
   { ZOa|lB (,  
    if(hCallWnd[index]==NULL) BQg3+w:>  
     continue; c6c@ Xd V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y2.zT6i  
    { X _@|+d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ?#Z4Dg 9|  
     bProcessed=TRUE; I{[Z  
    } +ls`;f  
   } G'-#99wv.  
  } -PSgBH[  
  if(!bProcessed){ pXN'vP  
   for(int index=0;index<MAX_KEY;index++){ Q{950$ )L  
    if(hCallWnd[index]==NULL) C:5d/9k  
     continue; G&1bhi52  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +>!nqp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Z/?{{}H+  
   } 7/QK"0  
  } we^' R}d  
 } L{8_6s(:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); z5M6  
} m=^]93+  
&b5(Su  
BOOL InitHotkey() 5~IdWwG*w  
{ u|Mx}  
 if(hHook!=NULL){ z rSPa\M  
  nHookCount++; -/{FGbpR;  
  return TRUE; bl^Ihza  
 } v=lW5%r,'  
 else Y01! D"{\  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); XJ3sqcS  
  if(hHook!=NULL) pUqC88*j  
   nHookCount++; =%IyR  
  return (hHook!=NULL); \-;f<%+  
} 0: hv6Ge^  
BOOL UnInit() 0`c{9gY.  
{ r W[;3yMf  
 if(nHookCount>1){ (M$>*O3SR  
  nHookCount--; !.mR]El{K  
  return TRUE; J$1H3#VV G  
 } o68i0aFW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); E;C{i  
 if(unhooked==TRUE){ *1`X}  
  nHookCount=0; }p2iF2g9`  
  hHook=NULL; ~d]v{<3  
 } a!:N C  
 return unhooked; LiT%d  
} #d\&6'O  
..u{v}4&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H2R3I<j  
{ "*t6KXVaM  
 BOOL bAdded=FALSE; qovsM M  
 for(int index=0;index<MAX_KEY;index++){ <.4(#Ebd  
  if(hCallWnd[index]==0){ N?vb^?  
   hCallWnd[index]=hWnd; Vl5>o$G|<.  
   HotKey[index]=cKey; bGeIb-|(  
   HotKeyMask[index]=cMask; B1nm?E 0i  
   bAdded=TRUE; $]E+E.P  
   KeyCount++; nI6ompTX  
   break; 8Zsaq1S  
  } \~%+)a%%  
 } zs#-E_^%M  
 return bAdded; !9/`PcNIpy  
}  J3 Q_  
T@yQOD7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JnBc@qnP6  
{ <<MpeMi  
 BOOL bRemoved=FALSE; iXnXZ|M  
 for(int index=0;index<MAX_KEY;index++){ LsERcjwwK  
  if(hCallWnd[index]==hWnd){ ekyCZ8iai  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 08nh y[  
    hCallWnd[index]=NULL; jerU[3  
    HotKey[index]=0; 6Oy:5Ps8a  
    HotKeyMask[index]=0; $"/l*H\h  
    bRemoved=TRUE; :gwmk9LZ  
    KeyCount--; q\o#<'F1J  
    break; 2w7$"N  
   } Zio! j%G  
  } Y`ip. Nx  
 } *% ;A85V/  
 return bRemoved; 9S]pC?N]E  
} ~&)\8@2  
U%:%. Bys  
void VerifyWindow() Ljz)%y[s  
{ ?l6yLn5si^  
 for(int i=0;i<MAX_KEY;i++){ 'W_NRt:  
  if(hCallWnd!=NULL){ 4%r?(C0x  
   if(!IsWindow(hCallWnd)){ VX.LL 5  
    hCallWnd=NULL; .2@T|WD!Ah  
    HotKey=0; +-'F]?DN'  
    HotKeyMask=0; ^aAs=KditO  
    KeyCount--; $EFS_*<X  
   } ?{TWsuP7  
  } 2: gh q  
 } PxrT@.T$  
} h7E?7nR  
a8T9=KY^  
BOOL CHookApp::InitInstance() qLL rR,:  
{ k(H]ILL  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); wGLMLbj5  
 hins=AfxGetInstanceHandle(); -r cEG!  
 InitHotkey(); _WWC8?6 U  
 return CWinApp::InitInstance(); 3 twA5)v  
} 4utwcXL  
jq)Bj#'7  
int CHookApp::ExitInstance() _@B?  
{ _?"y1 L.  
 VerifyWindow(); h<&GdK2U+  
 UnInit(); [x{$f7CEh  
 return CWinApp::ExitInstance(); /a32QuS  
} u|IS7>Sm  
m^L!_~  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |E6_TZ#=  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) x @43ZH_  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q9OCf"n$  
#if _MSC_VER > 1000 h!SsIy(  
#pragma once `:3nF'  
#endif // _MSC_VER > 1000 kB@gy}  
%|H]T] s  
class CCaptureDlg : public CDialog eoww N>-2C  
{ b(N\R_IQ~  
 // Construction QD%xmP  
 public: bh5D}w  
  BOOL bTray; }6a}8EyFP  
  BOOL bRegistered; "v?F4&\ 8  
  BOOL RegisterHotkey(); If'2 m_  
  UCHAR cKey; NL:-3W7vf  
  UCHAR cMask; 8zeeC eIU  
  void DeleteIcon(); 6ZE`'pk<  
  void AddIcon(); \ejHM}w3,  
  UINT nCount; tco G;ir  
  void SaveBmp(); 0e0)1;t\  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^dLu#,;  
  // Dialog Data >Du=(pB  
  //{{AFX_DATA(CCaptureDlg) cy@R i#  
  enum { IDD = IDD_CAPTURE_DIALOG }; eef&ZL6g  
  CComboBox m_Key; >(P(!^[f  
  BOOL m_bControl; Zfk]Z9YO  
  BOOL m_bAlt; G8vDy1`q6  
  BOOL m_bShift;  I\_2=mL  
  CString m_Path; r}qDvC D  
  CString m_Number; ( gg )?  
  //}}AFX_DATA (y; 6 H  
  // ClassWizard generated virtual function overrides a6 vej  
  //{{AFX_VIRTUAL(CCaptureDlg) |Io:D:  
 public: }&/>v' G  
  virtual BOOL PreTranslateMessage(MSG* pMsg); U%bm{oVn  
 protected: &Cb,C+q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8GW+:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5FJLDT2Lg  
  //}}AFX_VIRTUAL V/H+9+B7Im  
  // Implementation pnSKIn  
 protected: kiJ=C2'&  
  HICON m_hIcon; Lqxh y s  
  // Generated message map functions D)x^?!  
  //{{AFX_MSG(CCaptureDlg) N9|J\;fzT  
  virtual BOOL OnInitDialog(); ;MNUT,U  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); n[e C  
  afx_msg void OnPaint(); .n8O 3V  
  afx_msg HCURSOR OnQueryDragIcon(); 7~+Fec`Ut*  
  virtual void OnCancel(); O^CBa$  
  afx_msg void OnAbout(); 4>oM5Yf8  
  afx_msg void OnBrowse(); >k`qPpf&  
  afx_msg void OnChange(); <eMqg u  
 //}}AFX_MSG !HU$V9C  
 DECLARE_MESSAGE_MAP() Wap4:wT  
}; }v}F8}4  
#endif X<IW5*   
8y6dT  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file PcA^ jBgGl  
#include "stdafx.h" %XN;S29d5W  
#include "Capture.h" Gr\jjf`  
#include "CaptureDlg.h" *w0|`[P+h  
#include <windowsx.h> b-8@_@f|g  
#pragma comment(lib,"hook.lib") B|a<=~  
#ifdef _DEBUG ZKrK >X  
#define new DEBUG_NEW k0=!%f_G!  
#undef THIS_FILE 8D`+3  
static char THIS_FILE[] = __FILE__; mK$E&,OkA  
#endif ;"IWm<]h;-  
#define IDM_SHELL WM_USER+1 >;Oa|G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _Jg#T~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); %[KnpJ{\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39};  kSEA  
class CAboutDlg : public CDialog M887 Q'HSi  
{ Tv7W)?3h  
 public: r3?8nQ$  
  CAboutDlg(); Z*w({k7]  
  // Dialog Data CC!`fX6z>h  
  //{{AFX_DATA(CAboutDlg) tH;9"z# ~  
  enum { IDD = IDD_ABOUTBOX }; |-vyhr 0  
  //}}AFX_DATA eCKm4l'BZ  
  // ClassWizard generated virtual function overrides P=EZ6<c3&  
  //{{AFX_VIRTUAL(CAboutDlg) 9\?&u_ U"  
 protected: g zi=+oJ|4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [dLc+h1{B  
  //}}AFX_VIRTUAL yn ofDGAf  
  // Implementation 6{i0i9Tb  
 protected: ='D%c^;O8'  
  //{{AFX_MSG(CAboutDlg) 32+N?[9 *  
  //}}AFX_MSG H#GR*4x  
  DECLARE_MESSAGE_MAP() vM5I2C3_>!  
}; XOqHzft h6  
i| cA)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) P\WHM(  
{ l+6@,TY1U  
 //{{AFX_DATA_INIT(CAboutDlg) v,ecNuy*d  
 //}}AFX_DATA_INIT o7+<sL  
} ,[p?u']yZz  
8bMw.u=F  
void CAboutDlg::DoDataExchange(CDataExchange* pDX)  >h2qam  
{ M6cybEk`  
 CDialog::DoDataExchange(pDX); YRZw|H{>t  
 //{{AFX_DATA_MAP(CAboutDlg) 6flO;d/v  
 //}}AFX_DATA_MAP ;;UsHhbhI  
} Z{(Gib~{N  
(*eX'^Q)d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) |:(BI5&S  
 //{{AFX_MSG_MAP(CAboutDlg) p({|=+bl  
 // No message handlers L  ~Vw`C  
 //}}AFX_MSG_MAP )N{PWSPs  
END_MESSAGE_MAP() D.AiqO<z  
`m AYK)N  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) >Gg[J=7`  
: CDialog(CCaptureDlg::IDD, pParent) i-0AcN./p  
{ "OUY^ cM  
 //{{AFX_DATA_INIT(CCaptureDlg) 4mBM5Tv  
  m_bControl = FALSE; $?: -A  
  m_bAlt = FALSE; Q!~1Xc0S`p  
  m_bShift = FALSE; _mdJIa0D6k  
  m_Path = _T("c:\\"); mNe908Yw  
  m_Number = _T("0 picture captured."); ND9;%<80  
  nCount=0; 2 (ux  
  bRegistered=FALSE; .*FlB>1jy  
  bTray=FALSE; FGwgSrXL7  
 //}}AFX_DATA_INIT <9=RLENmY"  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R'K /\   
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 6x;"T+BSSS  
} AsZyPybq  
bg4VHT7?>)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 8v;T_VN  
{ S9/\L6Rmf  
 CDialog::DoDataExchange(pDX); EjVB\6,  
 //{{AFX_DATA_MAP(CCaptureDlg) T?__  
  DDX_Control(pDX, IDC_KEY, m_Key); U8g?   
  DDX_Check(pDX, IDC_CONTROL, m_bControl); b[;3y/X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Q%GLT,f1.  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); GEb)nHQq  
  DDX_Text(pDX, IDC_PATH, m_Path); d7c m?+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); NX+ eig</-  
 //}}AFX_DATA_MAP )^^}!U#|e  
} 6d 8n1_  
!q PUQ+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) v#IZSBvuQK  
//{{AFX_MSG_MAP(CCaptureDlg)  -gS/  
 ON_WM_SYSCOMMAND() +n`^W(  
 ON_WM_PAINT() \}qv}hU  
 ON_WM_QUERYDRAGICON() ;#"`]khd  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) zwHTtE  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) gwF@'Uu  
 ON_BN_CLICKED(ID_CHANGE, OnChange) `+@%l*TQ  
//}}AFX_MSG_MAP WUi7~Ei}  
END_MESSAGE_MAP() [ 06B)|s  
Ix5yQgnB}j  
BOOL CCaptureDlg::OnInitDialog() Vk~}^;`Y  
{ & l|B>{4v  
 CDialog::OnInitDialog(); 4]8PF  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 55N/[{[  
 ASSERT(IDM_ABOUTBOX < 0xF000); DFjkp;`1  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Z#W`0G>'  
 if (pSysMenu != NULL) .g&BA15<F6  
 { 7y`~T+  
  CString strAboutMenu; -)<Nd:A  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?,),%JQ  
  if (!strAboutMenu.IsEmpty()) !p9F'7;Y<  
  { qx? lCz a"  
   pSysMenu->AppendMenu(MF_SEPARATOR); QU4'x4YS  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); i|d41u;@  
  } If#7SF)n'  
 } 42Ffx?Qmv  
 SetIcon(m_hIcon, TRUE); // Set big icon nocH~bAf2  
 SetIcon(m_hIcon, FALSE); // Set small icon cE]kI,Fw,M  
 m_Key.SetCurSel(0); SoY&R=  
 RegisterHotkey(); F;NZJEy  
 CMenu* pMenu=GetSystemMenu(FALSE); I5"=b}V5  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); XAFTLNV>  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ?%0i,p@<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9VY_gi=vL  
 return TRUE; // return TRUE unless you set the focus to a control 6$5M^3$-  
} 2I4P":q  
'}Y8a$(;V  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |Z/ySAFM  
{ ff hD+-gTU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (6+0U1[Iz  
 { C ]XDDr  
  CAboutDlg dlgAbout; bcE DjLXq  
  dlgAbout.DoModal(); liB>~DVC  
 } pV+;/y_  
 else 6a!X`%N=  
 { V!=]a^]:  
  CDialog::OnSysCommand(nID, lParam); ?k?Hp:8?=  
 } u60l-  
} xMh&C{q  
1f:k:Y9i  
void CCaptureDlg::OnPaint() 0&-sz=L  
{ 2gv(`NKYE  
 if (IsIconic()) &pAT  
 { ;g*6NzdA  
  CPaintDC dc(this); // device context for painting ,5*4%*n\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3IxT2@H)  
  // Center icon in client rectangle wDG4rN9x  
  int cxIcon = GetSystemMetrics(SM_CXICON); WQ]pg "  
  int cyIcon = GetSystemMetrics(SM_CYICON); G#*;3X$  
  CRect rect; KP(Bu0S  
  GetClientRect(&rect); {Q"<q`c  
  int x = (rect.Width() - cxIcon + 1) / 2; :U> oW97l  
  int y = (rect.Height() - cyIcon + 1) / 2;  Ui.F<,E  
  // Draw the icon V+q RDQ  
  dc.DrawIcon(x, y, m_hIcon); ( FRf.mv{  
 } #]'xUgcE9  
 else (65p/$Vh  
 { V_QVLW  
  CDialog::OnPaint(); a*8}~p,  
 } 2P}RZvUd  
} uI[*uAR  
!ZZAI_N  
HCURSOR CCaptureDlg::OnQueryDragIcon() 9lxT5Wg  
{ @!da1jN  
 return (HCURSOR) m_hIcon; BTyVfq sx  
} jo*9QO  
DPOPRi~  
void CCaptureDlg::OnCancel() K/-D 5U  
{ $\ '\@3o  
 if(bTray) 5PPpX=\  
  DeleteIcon(); Xn=fLb(  
  CDialog::OnCancel(); I .ty-X]  
} 2'U9!. o  
,Mc 2dhq  
void CCaptureDlg::OnAbout() ap~Iz  
{ 8rYK~Sz  
 CAboutDlg dlg; /(aX>_7jg  
 dlg.DoModal(); C.-a:oQ[  
} jxaoQeac  
0 y%R  
void CCaptureDlg::OnBrowse() \tx/!tA  
{ mtHz6+  
 CString str; d ] ;pG(  
 BROWSEINFO bi; ~@a R5Q>us  
 char name[MAX_PATH]; -huZnDN  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }i:'f 2/  
 bi.hwndOwner=GetSafeHwnd(); N sL"p2w~  
 bi.pszDisplayName=name; Rjl__90  
 bi.lpszTitle="Select folder"; C 5 UDez  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; -; $/<  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ~*Qpv&y)  
 if(idl==NULL) /p0LtUMu  
  return; ^E17_9?  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Y +54z/{  
 str.ReleaseBuffer(); eB*8)gYh  
 m_Path=str; >iN%Uz  
 if(str.GetAt(str.GetLength()-1)!='\\') K3DJ"NJ<Ji  
  m_Path+="\\"; TP::y  
 UpdateData(FALSE); jqWvLBU!  
} D:tZiS=0  
a HL '(<  
void CCaptureDlg::SaveBmp() T(^8ki  
{ W2h[NimU  
 CDC dc;  a|uZJ*  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); bU`yymf{L  
 CBitmap bm; oH0F9*+W  
 int Width=GetSystemMetrics(SM_CXSCREEN); :0/o?'s  
 int Height=GetSystemMetrics(SM_CYSCREEN); x)ZH;)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); J6D$ i+  
 CDC tdc; Cpv%s 1M  
 tdc.CreateCompatibleDC(&dc); P%HyIODS  
 CBitmap*pOld=tdc.SelectObject(&bm); s,H(m8#>  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); a' o8n6i  
 tdc.SelectObject(pOld); iGVb.=)  
 BITMAP btm; 5G;^OI!g  
 bm.GetBitmap(&btm); 8k?L{hF|nW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; xGv,%'u\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Ia:puks=  
 BITMAPINFOHEADER bih; k+GnF00N^8  
 bih.biBitCount=btm.bmBitsPixel; <L/vNP  
 bih.biClrImportant=0; .eB"la|d  
 bih.biClrUsed=0; $'{`i 5XB  
 bih.biCompression=0; ]V^.!=gh$  
 bih.biHeight=btm.bmHeight; 0P3|1=  
 bih.biPlanes=1; 0lr4d Y  
 bih.biSize=sizeof(BITMAPINFOHEADER); B\ >}X_\4  
 bih.biSizeImage=size; !nBm}E7d  
 bih.biWidth=btm.bmWidth;  b(-t)5^}  
 bih.biXPelsPerMeter=0; ?V:]u 3  
 bih.biYPelsPerMeter=0; hs_|nr0;[  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N<"6=z@w+  
 static int filecount=0; ZfCr"aL  
 CString name; X3L[y\  
 name.Format("pict%04d.bmp",filecount++); 3nC#$L-   
 name=m_Path+name; um2s^G  
 BITMAPFILEHEADER bfh; c0Ro3j\p  
 bfh.bfReserved1=bfh.bfReserved2=0; NF(IF.8G  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `=$jc4@J  
 bfh.bfSize=54+size; JKi@Kw  
 bfh.bfOffBits=54; Iki+5  
 CFile bf; "q>I?UcZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _.*4Y  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); m<,G:?RM  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); bo!]  
  bf.WriteHuge(lpData,size); C\^<v&  
  bf.Close(); AH 87UkNL  
  nCount++; o7a6 )2JK  
 } Q1I_=fT  
 GlobalFreePtr(lpData); +;wqX]SD&  
 if(nCount==1) 2|H91Y2  
  m_Number.Format("%d picture captured.",nCount); /xm#:+Sc  
 else X)iWb(@k"7  
  m_Number.Format("%d pictures captured.",nCount); pM'IQ3N  
  UpdateData(FALSE); dIfs 8%kl  
} s!;VUr\  
{}J@+Zsi  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) -=t3O#  
{ MLD>"W  
 if(pMsg -> message == WM_KEYDOWN) BXK::M+  
 { fByh";<`P  
  if(pMsg -> wParam == VK_ESCAPE) ['Y+z2k  
   return TRUE; R4~zL!7;  
  if(pMsg -> wParam == VK_RETURN) rq(~/Yc  
   return TRUE; #C,f/PXfaB  
 } Gz[ym j)5  
 return CDialog::PreTranslateMessage(pMsg); IL>/PuZku  
} eFj6p<  
ADv"_bB:h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'K@{vB  
{ /@:up+$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ C/CfjRzd  
  SaveBmp(); ,JQxs7@2k  
  return FALSE; oLqbR?  
} )_c=mT  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 4/`h@]8P  
 CMenu pop; R0hc tT1j  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #[U 9(44,  
 CMenu*pMenu=pop.GetSubMenu(0); MCi`TXr  
 pMenu->SetDefaultItem(ID_EXITICON); ^L8Wn6s'  
 CPoint pt; g<rKV+$6  
 GetCursorPos(&pt); :<t{ =0G  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); zOiY0`=  
 if(id==ID_EXITICON) ?lc[ hH  
  DeleteIcon(); x'M^4{4[  
 else if(id==ID_EXIT) AJ#m6`M+EK  
  OnCancel(); /J[H5uA  
 return FALSE; <nb3~z1  
} ( *9Ip  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Q9yGQu  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) hSkc9jBF  
 AddIcon(); [j=,g-EOA  
 return res; ?}=-eJ(7e  
} ;Y@!:p- H  
`s>UU- 9  
void CCaptureDlg::AddIcon() 62MRI    
{ O/D Af|X|  
 NOTIFYICONDATA data; TDAWI_83-  
 data.cbSize=sizeof(NOTIFYICONDATA); ]<8B-D?Z  
 CString tip; $c@w$2  
 tip.LoadString(IDS_ICONTIP); r)6uX  
 data.hIcon=GetIcon(0); |%'6f}fnE  
 data.hWnd=GetSafeHwnd(); $>'")7z  
 strcpy(data.szTip,tip); jJ*@5?A  
 data.uCallbackMessage=IDM_SHELL; aJ5H3X}Y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 3C rQBIj1  
 data.uID=98; HBh` 2Q  
 Shell_NotifyIcon(NIM_ADD,&data); =mHkXHE~:  
 ShowWindow(SW_HIDE); `%t$s,TiP  
 bTray=TRUE; T|o`a+?  
} XOysgX0g  
YH)Opk  
void CCaptureDlg::DeleteIcon() hncS_ZA  
{ XMN?;Hj>  
 NOTIFYICONDATA data; > $w^%I  
 data.cbSize=sizeof(NOTIFYICONDATA); {J,6iP{>ZN  
 data.hWnd=GetSafeHwnd(); b&lN%+%}  
 data.uID=98; 0W T#6D  
 Shell_NotifyIcon(NIM_DELETE,&data); yaH Trh%  
 ShowWindow(SW_SHOW); a -xW8  
 SetForegroundWindow(); ]Q6+e(:~ZH  
 ShowWindow(SW_SHOWNORMAL); lQV|U;~D  
 bTray=FALSE; SXRdNPXFO  
} Q'Jv} 'eK_  
="uKWt6n'  
void CCaptureDlg::OnChange() \8;Qv  
{ {fog<1c  
 RegisterHotkey(); xn(+G$m  
} 7"ylN"syZ  
p+, 1Fi  
BOOL CCaptureDlg::RegisterHotkey() -"W)|oC_  
{ _Ry_K3K  
 UpdateData(); I2TD.wuIW  
 UCHAR mask=0; ![^EsgEB*  
 UCHAR key=0; )46 0 Ed  
 if(m_bControl) <jbj/Q )"  
  mask|=4; u5Qp/ag?N  
 if(m_bAlt) P3'2IzNw  
  mask|=2; dCB&c ^  
 if(m_bShift) `kv1@aQPL  
  mask|=1; Y)$52m5rM  
  key=Key_Table[m_Key.GetCurSel()]; ^9&b+u=X  
 if(bRegistered){ n!GWqle  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); !8.En8Z<D-  
  bRegistered=FALSE; +"'F Be  
 } 7t'(`A 6t/  
 cMask=mask; LO"_NeuL  
 cKey=key; Xo2^N2I  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); D9ANm"#  
 return bRegistered; |2z}Xm5\  
} 53B.2 4Tm  
>G]?  
  四、小结 XZ} de%U1  
#nKRTb+{  
  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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