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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: [}mx4i  
  eYpK!9  
  一、实现方法 ,8tk]W[C  
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  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: l;~b:[r  
8q}955Nl  
#pragma data_seg("shareddata") 4X}.aZO&b  
HHOOK hHook =NULL; //钩子句柄 rf ?\s/#OY  
UINT nHookCount =0; //挂接的程序数目 wr) \GJ#>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 A$7j B4  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ;4%Co)Rw  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 3J3Yt`  
static int KeyCount =0; ;4:[kv@  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 9I|D"zXn  
#pragma data_seg() pO_$8=G+  
:{g;J  
  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 BACKu  
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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: )/p=ZH0[  
?LwBF;Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR H(QbH)S$6  
cKey,UCHAR cMask) ^oLMgz  
{ ^b;3Jj  
 BOOL bAdded=FALSE; 0XSMby?t`  
 for(int index=0;index<MAX_KEY;index++){ ` P,-NVB  
  if(hCallWnd[index]==0){ "9^OT  
   hCallWnd[index]=hWnd; (zmL MG(R  
   HotKey[index]=cKey; Ue?mb$ykC.  
   HotKeyMask[index]=cMask; =$w QA  
   bAdded=TRUE; K!<3|d  
   KeyCount++; 83i;:cn  
   break; >d9b"T  
  } )wM881_!  
 } Q2)CbHSz  
 return bAdded; aA6m5  
} 75"&"*R/*G  
//删除热键  >7$h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <K:L.c!  
{ ~_]i'ii8  
 BOOL bRemoved=FALSE; 3nbTK3,  
 for(int index=0;index<MAX_KEY;index++){ 1_B;r9x  
  if(hCallWnd[index]==hWnd){ [.Y]f.D  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ h N U.y  
    hCallWnd[index]=NULL; Y(/y,bJ?jp  
    HotKey[index]=0; k^{}p8;3  
    HotKeyMask[index]=0; N0V`xrS  
    bRemoved=TRUE; /* G-\|  
    KeyCount--; DUMC4+i  
    break; W}iDT?Qi  
   } x,fX mgE  
  } TB%NHq-!  
 } GQ8A}gwH  
 return bRemoved; "Q.KBX v/  
} n|'}W+  
CxV$_J  
wZsjbNf`K  
  DLL中的钩子函数如下: ZWb\^N  
r @URs;O=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Yma-$ytp  
{ f{w[H S,z  
 BOOL bProcessed=FALSE; KLpFW}  
 if(HC_ACTION==nCode) !<UdG+iV  
 { hcT5>w[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 *JA0Vs 5  
   switch(wParam) ?58*#'r  
   {  iGw\A!}w\  
    case VK_MENU: XE`u  
     MaskBits&=~ALTBIT; l|S_10x5  
     break; b^'>XT~1J&  
    case VK_CONTROL: (o2.*x  
     MaskBits&=~CTRLBIT; .)|2^ 'W  
     break; nhLw&V3y  
    case VK_SHIFT: \ ^3cNw  
     MaskBits&=~SHIFTBIT; @M)"  
     break; ] A,Og_g  
    default: //judge the key and send message q71V]!  
     break; ,KaO8^PB  
   } ~(-df>  
   for(int index=0;index<MAX_KEY;index++){ mum4Uj  
    if(hCallWnd[index]==NULL) cq4sgQ?sW  
     continue; b ~C^cM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iTVepYv4m  
    { C5^9D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); {wp tOZ  
     bProcessed=TRUE; BMH?BRi  
    } U1=]iG<%  
   } [<JY[o=  
  } fD#!0^  
  else if((lParam&0xc000ffff)==1){ //有键按下 e8U6D+jY  
   switch(wParam) zxrbEE Q  
   { T( CTU/a-,  
    case VK_MENU: 'p&q}IO  
     MaskBits|=ALTBIT; 5n1T7-QCL  
     break; D9r4oRkP*  
    case VK_CONTROL: >l=;6QL  
     MaskBits|=CTRLBIT; :OD-L)Or  
     break; h/NI5   
    case VK_SHIFT: #^9a[ZLj0  
     MaskBits|=SHIFTBIT; tKCX0UZ'  
     break; 2!nz>K  
    default: //judge the key and send message mc|8t0+1`  
     break; <.U(%`|  
   } >@.:9}Z  
   for(int index=0;index<MAX_KEY;index++){ ^TqR0a-*  
    if(hCallWnd[index]==NULL) t&MLgu  
     continue; bmw"-W^U[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ih%LKFT  
    { uC5W1LyI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); p&lT! 5P!A  
     bProcessed=TRUE; PcEE@W9  
    } ,F?O} ijk  
   } ;tWi4iT+.  
  } 1v'|%B;O  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 K}!YXy h  
   for(int index=0;index<MAX_KEY;index++){ wF)g@cw  
    if(hCallWnd[index]==NULL) "q7pkxEuJ  
     continue; [W8?ww%qT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) n7,LfO#  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '&F Pk T:5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !4}Wp.  
   } RX ,c4;  
  } #OsUF,NU  
 } xeKfc}:&z  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g)=-%n'RoE  
} BUU ) Sz  
#F:\_!2c  
  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: >]/aG!  
tREC)+*\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hEfFMi=a`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S*(n s<L  
(2'q~Z+>'  
  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: ?dQ#%06mn  
?#J;\^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D)J'xG_<O  
{ f=Kt[|%'e  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ~?:Xi_3Lo  
 { mO @Sl(9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 PaBqv]  
  SaveBmp(); dk@iAL*v  
  return FALSE; #QKgY7  
 } vf h*`G$  
 …… //其它处理及默认处理 M*<Bp   
} r=ht:+m  
 r95$( N  
? W2W y\  
  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。 rE4qPzL  
rB-}<22.  
  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。 skBzwVW I  
X  m%aT  
  二、编程步骤 7=@Mn F`  
+KHk`2{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";  2D"\Ox  
-"w&g0Z  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )Zit6I  
W%P0X5YQ  
  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; Qh,Dcg2ZM"  
RRJN@|"  
  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;  F!&_  
h2mU  
  5、 添加代码,编译运行程序。 k4BiH5\hA  
Kv#TJn  
三、程序代码 $6yr:2Xvt  
XV0t 8#T2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #brV{dHV,  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) %^<A` Q_  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S0mF %"  
#if _MSC_VER > 1000 Yc~c(1VRz  
#pragma once  *egAx  
#endif // _MSC_VER > 1000 H^0`YQJ3  
#ifndef __AFXWIN_H__ FW!1 0K?  
#error include 'stdafx.h' before including this file for PCH 82~ZPZG  
#endif !_LRuqQ?"  
#include "resource.h" // main symbols D(^ |'1  
class CHookApp : public CWinApp vV /fTO  
{ `yWWX.`  
 public: ^*+-0b;[G  
  CHookApp(); 6ZwFU5)QE/  
  // Overrides D3kx&AR  
  // ClassWizard generated virtual function overrides UZ3oc[#D=]  
  //{{AFX_VIRTUAL(CHookApp) =]hPX  
 public: =U<6TP]{  
  virtual BOOL InitInstance(); I DtGtkF  
  virtual int ExitInstance(); \:d|'r8OCM  
  //}}AFX_VIRTUAL h2fTG  
  //{{AFX_MSG(CHookApp) bx%P-r31  
  // NOTE - the ClassWizard will add and remove member functions here. .LEn~ 8  
  // DO NOT EDIT what you see in these blocks of generated code ! 2 NrMse  
  //}}AFX_MSG  o0Pc^  
  DECLARE_MESSAGE_MAP() +}@6V4BRn  
}; #e(P~'A0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2_#V w&v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ZHW|P  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h]#bPb  
BOOL InitHotkey(); pxO ?:B  
BOOL UnInit(); ]WP[hF  
#endif DeL7sU  
E/N*n!sV  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. yct^AN|%  
#include "stdafx.h" /Jw 65 e  
#include "hook.h" <-m?l6  
#include <windowsx.h> uZ7~E._  
#ifdef _DEBUG 0G"I}Jp{  
#define new DEBUG_NEW ~pj/_@S@x  
#undef THIS_FILE lhLE)B2a2  
static char THIS_FILE[] = __FILE__; K/+w6d  
#endif y |E {]  
#define MAX_KEY 100 fxL0"Ry  
#define CTRLBIT 0x04 ~LuR)T=%es  
#define ALTBIT 0x02 4'ymPPY  
#define SHIFTBIT 0x01 Xv1mjHZCC  
#pragma data_seg("shareddata") JYU0&nZl4  
HHOOK hHook =NULL; =/]d\JSp  
UINT nHookCount =0; ,6FmU$ Kn  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 6Y(Vs>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0(~,U!g[=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 3-Xc3A=w  
static int KeyCount =0; Ib665H7w  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 3gzcpFNqX  
#pragma data_seg() tZn=[X~Vw@  
HINSTANCE hins; y vz2eAXa  
void VerifyWindow(); FD*w4U5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) } I;5yk,o  
//{{AFX_MSG_MAP(CHookApp) ><Z`) }f  
// NOTE - the ClassWizard will add and remove mapping macros here. ;p}X]e l}  
// DO NOT EDIT what you see in these blocks of generated code! 0/Wo":R:  
//}}AFX_MSG_MAP LV X01ox$  
END_MESSAGE_MAP() p .^#mN  
7ZVW7%,zF  
CHookApp::CHookApp() T2V# fYCc  
{ #`9D,+2iB%  
 // TODO: add construction code here, 'aoHNZfxw  
 // Place all significant initialization in InitInstance  'WW['  
} {_i.IPp~  
;+/[<bvd"  
CHookApp theApp; ,/P)c*at5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) O-ZB4hN8  
{ |p1 pa4%}  
 BOOL bProcessed=FALSE; 0aS&!"o!  
 if(HC_ACTION==nCode) C3 m#v[+  
 { "|:I]ZB  
  if((lParam&0xc0000000)==0xc0000000){// Key up !@<>S>uGG  
   switch(wParam) >nL9%W}8M  
   { `*nK@:  
    case VK_MENU: eVYUJ,  
     MaskBits&=~ALTBIT; e~,/Z\i  
     break; 6s"Erq5q  
    case VK_CONTROL:  Py)'%e  
     MaskBits&=~CTRLBIT; uBe1{Z  
     break; xe3t_y  
    case VK_SHIFT: O]Mz1 ev|  
     MaskBits&=~SHIFTBIT; 4&c7^ 4w~  
     break; _(<D*V[  
    default: //judge the key and send message 9-9:]2~g!  
     break; cNd2XQB9=  
   }  FGP~^Dr/  
   for(int index=0;index<MAX_KEY;index++){ 68^5X"OGF  
    if(hCallWnd[index]==NULL) m%hUvG| i  
     continue; q3s +?&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t,2Q~ied=  
    { 8VwByk8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `Oc`I9  
     bProcessed=TRUE; A%G \ AT  
    } ul',!js?  
   } 1JU1XQi  
  } +AT!IZrB2i  
  else if((lParam&0xc000ffff)==1){ //Key down /{~cUB,Um  
   switch(wParam) S}rW=hO  
   { ?kvkdHEO_  
    case VK_MENU: ?OU+)kgzh  
     MaskBits|=ALTBIT; u$ZahN!  
     break; D* oJz3[  
    case VK_CONTROL: \y%:[g}Fvw  
     MaskBits|=CTRLBIT;  /_r g*y*  
     break; jR^>xp;  
    case VK_SHIFT: AF qut  
     MaskBits|=SHIFTBIT; > qSaF  
     break; 8\~IwtSk  
    default: //judge the key and send message p?X`f#  
     break; G([!(8&2Y  
   } :X`Bc"  
   for(int index=0;index<MAX_KEY;index++) =m4_8)-8u  
   { 3??*G8Yp  
    if(hCallWnd[index]==NULL) om"q[Tudc  
     continue; *Iu .>nw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zh WtY  
    { $z9z'^HqO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); b (,X3x*  
     bProcessed=TRUE; 7x%0 ^~/n  
    } C(-bh]J  
   } pEjA*6v|,  
  } H:ar&o#(  
  if(!bProcessed){ GA{Q6]B  
   for(int index=0;index<MAX_KEY;index++){ J!@$lyH  
    if(hCallWnd[index]==NULL) TT429  
     continue; &S.zc@rN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  (BgO<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %EuXL% B  
   } od- 0wJN-m  
  } I499 Rrw#E  
 } 1f 0"z1   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); T#1>pED  
} ]Qp0|45=  
}31z 35  
BOOL InitHotkey() <mc[-To  
{ MK]S205{  
 if(hHook!=NULL){ 0;-S){  
  nHookCount++; {.We%{4V  
  return TRUE; 1R/=as,R  
 } 7/;Xt&  
 else =W9;rQm  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); &/7AW(?  
  if(hHook!=NULL) "jVMk  
   nHookCount++; T x_n$ &  
  return (hHook!=NULL); 13]sZ([B%|  
} vXnTPjbE  
BOOL UnInit() K%<Z"2!+  
{ <!\J([NM8  
 if(nHookCount>1){ Riq5Au?*)  
  nHookCount--; %aX<p{EY  
  return TRUE; BPnZ"w_  
 } ,=tVa])  
 BOOL unhooked = UnhookWindowsHookEx(hHook); `@{qnCNQ  
 if(unhooked==TRUE){ A$RN7#  
  nHookCount=0; 9-+6Ed^2  
  hHook=NULL; Ed|7E_v  
 } n>X  
 return unhooked; %S22[;v{N  
} cI3uH1;#  
z(^p@&r)F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U~ SK 'R  
{ TA=Ij,z~  
 BOOL bAdded=FALSE; S:] w@$  
 for(int index=0;index<MAX_KEY;index++){ Vkex&?>v$  
  if(hCallWnd[index]==0){ bw{%X  
   hCallWnd[index]=hWnd; >RxZ-.,a  
   HotKey[index]=cKey; T7YzO,b/   
   HotKeyMask[index]=cMask; VGBL<X  
   bAdded=TRUE; SZ-%0z  
   KeyCount++; l[ ^bo/  
   break; Mg95us  
  } ]"^GRFK5  
 } (jCE&'?}  
 return bAdded; EkV v  
} nX>k}&^L  
/Mf45U<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) s&vOwPmV  
{ U %Aj~K^b  
 BOOL bRemoved=FALSE; il-v>GJU7{  
 for(int index=0;index<MAX_KEY;index++){ T7n;Bf  
  if(hCallWnd[index]==hWnd){ K/Axojo  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ;W#G<M&n'  
    hCallWnd[index]=NULL; +bd/*^  
    HotKey[index]=0; MQ"<r,o?:  
    HotKeyMask[index]=0; cGC&O%`i,\  
    bRemoved=TRUE; A 20_a;V  
    KeyCount--; .+aSa?h_  
    break; P/t$xqAL  
   } A]B D2   
  } NF0} eom  
 } 2P9hx5PiV  
 return bRemoved; <4*7HY[  
} $$ \| 3rj!  
0;e>kz3o  
void VerifyWindow() Cs%'Af  
{ Y&k'4Y%  
 for(int i=0;i<MAX_KEY;i++){ 2`t4@T  
  if(hCallWnd!=NULL){ a+*|P  
   if(!IsWindow(hCallWnd)){ 4MRHz{`wa  
    hCallWnd=NULL; CN: 36  
    HotKey=0; <s-_ieW'  
    HotKeyMask=0; ? Z8_(e0U  
    KeyCount--; av wU)6L  
   } 1k l4X3q6  
  } QsI>_<r  
 } sBF>a|  
} bQ0m=BzF  
\rADwZm  
BOOL CHookApp::InitInstance() ~z>2`^Z"  
{ RsVba!x@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ? _[gs/i}  
 hins=AfxGetInstanceHandle(); rMpb  
 InitHotkey(); )0PUK9  
 return CWinApp::InitInstance(); ;wDcYs  
} ux VXnQQ  
yXrFH@3  
int CHookApp::ExitInstance() H@__%KBw  
{ +t/ VF(!  
 VerifyWindow(); ~mK9S^[  
 UnInit(); `EU=u_N  
 return CWinApp::ExitInstance(); WABq6q!  
} RhbYDsG  
|)pT"`  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file H*yX Iq:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) PWLMux  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ >F,~QHcz  
#if _MSC_VER > 1000 v"_hWJ)  
#pragma once &hd+x5  
#endif // _MSC_VER > 1000 z7{b>oub('  
r6 ,5&`&  
class CCaptureDlg : public CDialog q(!191@C(  
{ 4<Bj;1*4  
 // Construction athU  
 public: 5@Ot@o  
  BOOL bTray; !K(0)~u  
  BOOL bRegistered; =wU08}  
  BOOL RegisterHotkey(); nd_d tsp#  
  UCHAR cKey; GR O[&;d`  
  UCHAR cMask; OMO.-p  
  void DeleteIcon(); u Dm=W36  
  void AddIcon(); &bs/a] ?Z7  
  UINT nCount; ?K I_>{  
  void SaveBmp(); 6/s#'#jh  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor R S;r  
  // Dialog Data qN}0$x>p  
  //{{AFX_DATA(CCaptureDlg) }I,]"0b  
  enum { IDD = IDD_CAPTURE_DIALOG }; k=w%oqpN  
  CComboBox m_Key; X!"ltNd  
  BOOL m_bControl; f]%$HfF @  
  BOOL m_bAlt; ph%/;?wY  
  BOOL m_bShift; /jeurCQ8#u  
  CString m_Path; ?8b?{`@V  
  CString m_Number; ^#lPXC Bg  
  //}}AFX_DATA n/S1Hae`  
  // ClassWizard generated virtual function overrides hUB _[#8#  
  //{{AFX_VIRTUAL(CCaptureDlg) =<iK3bPkU  
 public: ?o),F^ir  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0j7\.aaK  
 protected: :s$ rD  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %@kmuz??  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V8`t7[r  
  //}}AFX_VIRTUAL MPT*[&\-  
  // Implementation 2m[z4V@`  
 protected: E]6;nY?  
  HICON m_hIcon; z[}[:H8  
  // Generated message map functions e6QUe.S  
  //{{AFX_MSG(CCaptureDlg) @lDoMm,m'  
  virtual BOOL OnInitDialog(); j5G8IP_Wx  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); `kVy1WiY  
  afx_msg void OnPaint(); m+"?;;s  
  afx_msg HCURSOR OnQueryDragIcon(); L @t<%fy@  
  virtual void OnCancel(); K.",=\53  
  afx_msg void OnAbout(); HPg@yx"U  
  afx_msg void OnBrowse(); 80&JEtRh  
  afx_msg void OnChange(); %W+*)u72(  
 //}}AFX_MSG !d&K,k  
 DECLARE_MESSAGE_MAP() ;6U=fBp7<  
}; K82pWpR  
#endif )(_}60  
sZFjkfak  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file M@E*_U!U  
#include "stdafx.h" *(PGL YK  
#include "Capture.h"  l}5@6;}  
#include "CaptureDlg.h" AWi~qzTZ  
#include <windowsx.h> }tua0{N:z  
#pragma comment(lib,"hook.lib") MHpPb{ ^  
#ifdef _DEBUG GTeFDm; T^  
#define new DEBUG_NEW >ys>Q)  
#undef THIS_FILE w(eAmN:zR  
static char THIS_FILE[] = __FILE__; iLws;3UX;x  
#endif S c_*L<$  
#define IDM_SHELL WM_USER+1 @F+4 NL-'P  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #78p# E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .`)\GjDv  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Zq}w}v  
class CAboutDlg : public CDialog 6 GO7[?U<  
{ m`}! dBi  
 public:  -*_D!  
  CAboutDlg(); k>FMy#N|@  
  // Dialog Data ZXY5Xvt:v  
  //{{AFX_DATA(CAboutDlg) "<Dn%r  
  enum { IDD = IDD_ABOUTBOX }; i"_)91RA  
  //}}AFX_DATA #Ne<=ayS  
  // ClassWizard generated virtual function overrides G{pfyfF  
  //{{AFX_VIRTUAL(CAboutDlg) e_kP=|u)g  
 protected: P|!GXkS  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `kpX}cKK}  
  //}}AFX_VIRTUAL `M6!V  
  // Implementation E*:!G  
 protected: 1j`-lD  
  //{{AFX_MSG(CAboutDlg) [V|,O'X ~  
  //}}AFX_MSG C5CUMYU  
  DECLARE_MESSAGE_MAP() IgI*mDS&b  
}; r1\c{5Wt  
'nz;|6uC  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) j\B]>PP5  
{ osoreo;V^  
 //{{AFX_DATA_INIT(CAboutDlg) d(3F:dbk  
 //}}AFX_DATA_INIT X*KQWs.  
} X|TEeE c[L  
9TIyY`2!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,^pM]+NF|  
{ O#7ONQfBO  
 CDialog::DoDataExchange(pDX); Hzcy '  
 //{{AFX_DATA_MAP(CAboutDlg) 2E33m*C2  
 //}}AFX_DATA_MAP ug'I:#@2  
} z\Rs?v"  
`MA ee8u'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) X/ gIH/  
 //{{AFX_MSG_MAP(CAboutDlg) gbsRf&4h  
 // No message handlers y>Zvose  
 //}}AFX_MSG_MAP K kP}z  
END_MESSAGE_MAP() 6}='/d-[  
MUhC6s\F  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) m4b fW  
: CDialog(CCaptureDlg::IDD, pParent) h$F;=YS   
{ o@>{kzCx  
 //{{AFX_DATA_INIT(CCaptureDlg) / *RDy!m  
  m_bControl = FALSE; 7g[m,48{  
  m_bAlt = FALSE; >6*"g{/  
  m_bShift = FALSE; }zY)H9J~  
  m_Path = _T("c:\\"); #s$b\"4  
  m_Number = _T("0 picture captured."); 1P#bR`I >  
  nCount=0; ZF"f.aV8)  
  bRegistered=FALSE; WPygmti}Be  
  bTray=FALSE; G~1#kg  
 //}}AFX_DATA_INIT P~Q5d&1SO  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7-6Z\.-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VUC  
}  _CY>45  
>J_{mU  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) O#  .^}  
{ '%_1eaH  
 CDialog::DoDataExchange(pDX); 1sl^+)z8  
 //{{AFX_DATA_MAP(CCaptureDlg) J]UlCg  
  DDX_Control(pDX, IDC_KEY, m_Key); %_0,z`f  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); k_/hgO  
  DDX_Check(pDX, IDC_ALT, m_bAlt); IT! a)d  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); &I Iw>,,  
  DDX_Text(pDX, IDC_PATH, m_Path); S+py \z%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); t j&+HC  
 //}}AFX_DATA_MAP :@jhe8'w  
} SweaE Rl  
7F;"=DarOE  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) bN$`&fC0  
//{{AFX_MSG_MAP(CCaptureDlg) )67_yHW  
 ON_WM_SYSCOMMAND() `au(' xi<  
 ON_WM_PAINT() %Fig`qX  
 ON_WM_QUERYDRAGICON() )^7Y^u e  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) sDT(3{)L7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 0,)B~|+  
 ON_BN_CLICKED(ID_CHANGE, OnChange) W{O:j  
//}}AFX_MSG_MAP 8J{I6nPF  
END_MESSAGE_MAP() 8>S"aHt 7  
.281;] =  
BOOL CCaptureDlg::OnInitDialog() P*oKcq1R  
{ j}uFp|df<  
 CDialog::OnInitDialog(); ,B%M P<Rz1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xB_F?d40T5  
 ASSERT(IDM_ABOUTBOX < 0xF000); Zx,R6@l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); G;_QE<V~_  
 if (pSysMenu != NULL) iwWy]V m7  
 { |-4C[5rM  
  CString strAboutMenu; A"x1MjuqLM  
  strAboutMenu.LoadString(IDS_ABOUTBOX); gvvl3`S{  
  if (!strAboutMenu.IsEmpty()) lwYk`'  
  { oEbgyT gB  
   pSysMenu->AppendMenu(MF_SEPARATOR); |Ak>kQJ(1z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); g9|B-1[  
  } L@2%a'  
 } #c@Dn.W  
 SetIcon(m_hIcon, TRUE); // Set big icon ^prseO?A  
 SetIcon(m_hIcon, FALSE); // Set small icon 6kuN)  
 m_Key.SetCurSel(0); &o{I9MD  
 RegisterHotkey(); La48M'u  
 CMenu* pMenu=GetSystemMenu(FALSE); pW7vY)hj  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); K&0op 4&  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); [R CUP.  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Gc>bli<-  
 return TRUE; // return TRUE unless you set the focus to a control ez=$]cln  
} 5%"${ywI  
?z%@;&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 9 P_`IsVK  
{ hO(8v&ns3  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lA {  
 { _/bFt6  
  CAboutDlg dlgAbout; ]2(vO0~  
  dlgAbout.DoModal(); JW9^C  
 } ,X(P/x{B  
 else ((^jyQ  
 { !|_b}/  
  CDialog::OnSysCommand(nID, lParam); .Gq.st%  
 } TU$PAwn=  
} [tsi8r =T  
LO]D XW 9  
void CCaptureDlg::OnPaint() Qw4P{>|Y  
{ ^I3cU'X  
 if (IsIconic()) ,Q4U<`ds!  
 { pA)!40kz  
  CPaintDC dc(this); // device context for painting $ r|R`n=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); NLFs)6\  
  // Center icon in client rectangle fiz2544  
  int cxIcon = GetSystemMetrics(SM_CXICON); PxzeN6f  
  int cyIcon = GetSystemMetrics(SM_CYICON); (RG\U[  
  CRect rect; 95B w;U3E  
  GetClientRect(&rect); 1}#v<b$  
  int x = (rect.Width() - cxIcon + 1) / 2; @?iLz7SPk  
  int y = (rect.Height() - cyIcon + 1) / 2; IGv_s+O-*  
  // Draw the icon /]"&E"X"  
  dc.DrawIcon(x, y, m_hIcon); GY<ErS)2  
 } Jfa=#`    
 else 2 P+RfE`o  
 { BT;hW7){9  
  CDialog::OnPaint(); rHPda?&H  
 } E@TX>M-&  
} WRU/^g3O@'  
I\DmVc\l  
HCURSOR CCaptureDlg::OnQueryDragIcon() T:o!H Xdj^  
{ :zfnp,Gv  
 return (HCURSOR) m_hIcon; v#&r3ZW0  
} _ _cJ+%e  
~E-YXl9  
void CCaptureDlg::OnCancel() ,!t1( H  
{ B04%4N.g"X  
 if(bTray) K y~ 9's  
  DeleteIcon(); UgDai?b1  
  CDialog::OnCancel(); -q' np0H  
} jUtrFl  
L;/#D>U(  
void CCaptureDlg::OnAbout() %F-/|x1#Q  
{ TEz)d=  
 CAboutDlg dlg; 1rh\X[@  
 dlg.DoModal(); ,6Sa  
} ^;+lsEW  
B%gk[!d}8  
void CCaptureDlg::OnBrowse() ='u'/g$'&  
{ ha  
 CString str; Je_Hj9#M\d  
 BROWSEINFO bi; +#8?y 5~q  
 char name[MAX_PATH]; 9XWF&6w6yf  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); h Vz%{R"  
 bi.hwndOwner=GetSafeHwnd(); #<f}.P.Uc  
 bi.pszDisplayName=name; `q* 0^}  
 bi.lpszTitle="Select folder"; c\FyX\ i  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 6G6Hg&B  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); nL!h hseH  
 if(idl==NULL) RrKAgw  
  return; a OR}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); I8HUH* |)n  
 str.ReleaseBuffer(); {:m5<6?x)  
 m_Path=str; vb/*ILS  
 if(str.GetAt(str.GetLength()-1)!='\\') G~_5E]8  
  m_Path+="\\"; @_ ^QBw0  
 UpdateData(FALSE); %Y%+K5;AZ  
} }u cqzdk#2  
iKv`[k  
void CCaptureDlg::SaveBmp() C>7Mx{!H  
{ Gir_.yc/  
 CDC dc; 9\3%5B7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #b\&Md|;  
 CBitmap bm; xP*9UXZ4P  
 int Width=GetSystemMetrics(SM_CXSCREEN); wpu]{~Y  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2!>phE  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &:=   
 CDC tdc; Y<TlvB)w  
 tdc.CreateCompatibleDC(&dc); ONJW*!(  
 CBitmap*pOld=tdc.SelectObject(&bm); X@Eq5s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); }`6-^lj  
 tdc.SelectObject(pOld); (Tp+43v  
 BITMAP btm; s([9 /ED  
 bm.GetBitmap(&btm); Fp4?/-]  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *E:w377<}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +A8S 6bA[=  
 BITMAPINFOHEADER bih; Le9r7O:  
 bih.biBitCount=btm.bmBitsPixel; 1~8F&  
 bih.biClrImportant=0; z   
 bih.biClrUsed=0; 6;Cr92  
 bih.biCompression=0; q_>DX,A  
 bih.biHeight=btm.bmHeight; FW#Lf]FJ  
 bih.biPlanes=1; -aG( Yx  
 bih.biSize=sizeof(BITMAPINFOHEADER); /:"%m:-P  
 bih.biSizeImage=size; Ek _k_!  
 bih.biWidth=btm.bmWidth; X +;Q=  
 bih.biXPelsPerMeter=0; Noz+\O\  
 bih.biYPelsPerMeter=0; /' L20aN2  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); [?Y u3E\  
 static int filecount=0; =sRd5aMs  
 CString name; qTC`[l  
 name.Format("pict%04d.bmp",filecount++); .  hHt+  
 name=m_Path+name; |[D~7|?  
 BITMAPFILEHEADER bfh;  ;Fcdjy  
 bfh.bfReserved1=bfh.bfReserved2=0; Dn$zwksSs  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 1pXAPTV  
 bfh.bfSize=54+size; \sHM[n F0  
 bfh.bfOffBits=54; g_;5"  
 CFile bf; W6'+#Fp  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ X^%I 3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); COv#dOw  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %#Wg>6  
  bf.WriteHuge(lpData,size); vq$%Ug/B  
  bf.Close(); \F,?ptu  
  nCount++; ;1S{xd*^N  
 } G,{L=x Oh  
 GlobalFreePtr(lpData); FU!U{qDI  
 if(nCount==1) V5KAiG<d  
  m_Number.Format("%d picture captured.",nCount); W()FKP\??!  
 else ERL(>)  
  m_Number.Format("%d pictures captured.",nCount); X ~4^$x  
  UpdateData(FALSE); v3S{dX<  
} @^Mn PM  
",E6)r  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) #:T5_9p  
{ yHQ.EZ~%  
 if(pMsg -> message == WM_KEYDOWN) T7m rOp  
 { ^]'p927  
  if(pMsg -> wParam == VK_ESCAPE) *-Lnsi^7v  
   return TRUE; ,qiS;2(  
  if(pMsg -> wParam == VK_RETURN) 9L%&4V}BIS  
   return TRUE; ~J)4(411  
 } GY,@jp|R  
 return CDialog::PreTranslateMessage(pMsg); 0VoC|,$U  
} Z T8. r0  
y>2v 9;Qp  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %'\D _W&  
{ C,]Q/6'>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qTqvEa^X`  
  SaveBmp(); N<Bi.\XC  
  return FALSE; 1|/2%IDUI  
} :L:;~tK  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ zQ]IlMt  
 CMenu pop; j /-p3#c  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); )t&|oQ3sVG  
 CMenu*pMenu=pop.GetSubMenu(0); ~SM2W%  
 pMenu->SetDefaultItem(ID_EXITICON); \'E_  
 CPoint pt; a6WE,4T9  
 GetCursorPos(&pt); &>I8^i  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 'P@a_*I  
 if(id==ID_EXITICON) n$`Nx\v  
  DeleteIcon(); H=X>o.iVqi  
 else if(id==ID_EXIT) zF)_t S  
  OnCancel(); m>:%[vm  
 return FALSE; ddnWr"_  
} }C" #b\A2  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Y141Twjvd  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 54uTu2  
 AddIcon(); 5*g@;aR1  
 return res; e-qr d  
} 68I4MZK>4  
EXa6"D  
void CCaptureDlg::AddIcon() fbw {)SZ  
{ z@~1e]%  
 NOTIFYICONDATA data; < ]wN/B-8J  
 data.cbSize=sizeof(NOTIFYICONDATA); }'H Da M  
 CString tip; % Pa-fee  
 tip.LoadString(IDS_ICONTIP); `9K'I-hv<8  
 data.hIcon=GetIcon(0); _tjFb_}Q  
 data.hWnd=GetSafeHwnd(); 5R"b1  
 strcpy(data.szTip,tip); C dZ;ZR  
 data.uCallbackMessage=IDM_SHELL; &~E=T3  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; i;|% hDNWA  
 data.uID=98; ACyQsmqm:  
 Shell_NotifyIcon(NIM_ADD,&data);  .)cOu>  
 ShowWindow(SW_HIDE); &`>*3m(  
 bTray=TRUE; l*X5<b9  
} 6h+/C]4  
OPKX&)SE-  
void CCaptureDlg::DeleteIcon() +nJ}+|@K  
{ <wE2ly&x  
 NOTIFYICONDATA data; Jr''S}@|x  
 data.cbSize=sizeof(NOTIFYICONDATA); ]|[xY8 5}  
 data.hWnd=GetSafeHwnd(); zv0RrF^  
 data.uID=98; 2tWUBt\,g  
 Shell_NotifyIcon(NIM_DELETE,&data); (O`=$e  
 ShowWindow(SW_SHOW); +IS$Un  
 SetForegroundWindow(); r<|\4zIo/  
 ShowWindow(SW_SHOWNORMAL); cz T@txF  
 bTray=FALSE; dk(-yv'  
} }U^9(  
[MiD%FfcNH  
void CCaptureDlg::OnChange() ZgXh[UHQy  
{ H}U&=w'  
 RegisterHotkey(); Ix *KL=MG  
} 'HqAm$V+  
>_F& oA#  
BOOL CCaptureDlg::RegisterHotkey() yY"%6k,ZB  
{ yv'rJI~ Ps  
 UpdateData(); UBU(@T(  
 UCHAR mask=0; 3ZB;-F5v  
 UCHAR key=0; H/, tE0ZV  
 if(m_bControl) b-O4IDIT  
  mask|=4; 3c9[FZ@ya  
 if(m_bAlt) j|[s?YJl  
  mask|=2; uWfse19  
 if(m_bShift) U| N`X54  
  mask|=1; 6B+ @76wH  
  key=Key_Table[m_Key.GetCurSel()]; -%t0'cKn,  
 if(bRegistered){ n[iil$VKh  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 5;|9bWH  
  bRegistered=FALSE; 1qQgAhoY  
 } hD$U8~zK  
 cMask=mask; 6&u,.  
 cKey=key; 9CN / v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); v5 9>  
 return bRegistered; =  Oq;  
} \2+xMv)8  
-d[x 09  
  四、小结 S`6'~g  
n `n3[  
  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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