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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: MeW?z|x`'  
  8=,-r`oNy  
  一、实现方法 I@q(P>]X9  
LGT?/ gup  
  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: 'ocPG.PaU  
= ow=3Ku  
#pragma data_seg("shareddata") vXT>Dc2\!  
HHOOK hHook =NULL; //钩子句柄 Z,7VOf6g  
UINT nHookCount =0; //挂接的程序数目 12HE =  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4rrR;V"}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]..7t|^b&  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 'mO>hD`V  
static int KeyCount =0; J+r:7NvZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 %3@-. =  
#pragma data_seg() )%vnl~i!  
#dDM "s  
  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。 lGpci  
jH?!\F2)+  
  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: ED^0t  
VCQo3k5 {  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 3 @%XR8ss  
cKey,UCHAR cMask)  4}F~h  
{ yZkS   
 BOOL bAdded=FALSE; {3!E8~  
 for(int index=0;index<MAX_KEY;index++){ ]Gf`nJDV  
  if(hCallWnd[index]==0){ '^%kTNn  
   hCallWnd[index]=hWnd; cV:Ak~PKl  
   HotKey[index]=cKey; |&U{ z?  
   HotKeyMask[index]=cMask; MIdViS.g  
   bAdded=TRUE; ~}RfepM  
   KeyCount++; y-N]{!  
   break; ~DP_1V?  
  } ZY=a[K  
 } tr|)+~x3  
 return bAdded; _)[UartKx  
} ZaF9Q%  
//删除热键 Mh~E ]8b  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <h%I-e6  
{ 0t7vg#v|  
 BOOL bRemoved=FALSE; Z7p!YTA  
 for(int index=0;index<MAX_KEY;index++){ 8\Bb7*  
  if(hCallWnd[index]==hWnd){ ziC%Q8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ CaR-Yk   
    hCallWnd[index]=NULL; IPf>9#L  
    HotKey[index]=0; + f,Kt9Cy  
    HotKeyMask[index]=0; kxmc2RH>nB  
    bRemoved=TRUE; "/Pq/\,R|  
    KeyCount--; `#"xgOSP>  
    break; v?0F  
   } xSq{pxX  
  } Z):Nd9  
 } '^M.;Giz  
 return bRemoved; g cb6*@u!  
} qKTzigjj  
EYA=fU  
'}$$0S.DC  
  DLL中的钩子函数如下: yt<h!k$ _P  
+`tk LvM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q)im2o@z  
{ |enb5b78  
 BOOL bProcessed=FALSE; bE?X?[K  
 if(HC_ACTION==nCode) =Y Y 7V!  
 { -\n%K  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .F G%QFF~  
   switch(wParam) us+z8Mz  
   {  JJK-+a6cX  
    case VK_MENU: Rqr>B(|  
     MaskBits&=~ALTBIT; bvS6xU- J  
     break; 3~:9ZWQ/  
    case VK_CONTROL: 'qJ0338d#U  
     MaskBits&=~CTRLBIT; \rd%$hci  
     break; Ub/ZzAwq  
    case VK_SHIFT: |-L7qZu%  
     MaskBits&=~SHIFTBIT; ^h^.;Iqr=  
     break; in6*3C4  
    default: //judge the key and send message (e Ssx/  
     break; ")<5 VtV  
   } ]kd:p*U6P  
   for(int index=0;index<MAX_KEY;index++){ N(V_P[]"*,  
    if(hCallWnd[index]==NULL) inh J|pe"  
     continue; A9;,y'm^8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $O%"[w  
    { sou~m,#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Jj?HOtaM  
     bProcessed=TRUE; O]' 2<;  
    } RL3*fRlb  
   } ;Y0M]pC  
  } ~r~YR=  
  else if((lParam&0xc000ffff)==1){ //有键按下 iBI->xU[U  
   switch(wParam) sNM ]bei  
   { ~d\^ynQ  
    case VK_MENU: No`*->R  
     MaskBits|=ALTBIT; hZlHY9[t?  
     break; B<i(Y1n[  
    case VK_CONTROL: #p"$%f5Q_  
     MaskBits|=CTRLBIT; FzNj':D  
     break; t<o7 S:a"  
    case VK_SHIFT: W^)mz,%x  
     MaskBits|=SHIFTBIT; CK1A$$gnz  
     break; 7ug"SV6Hb  
    default: //judge the key and send message huW,kk<]y  
     break; `jSegG'  
   } p6V#!5Q  
   for(int index=0;index<MAX_KEY;index++){ ea]qX6)UZ  
    if(hCallWnd[index]==NULL) %z=:P{0UQ  
     continue; ka6E s~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Wf^ sl  
    { ?U+hse3e~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t+_\^Oa)  
     bProcessed=TRUE; 8i5S }  
    } {xeJO:M3/  
   } wl&T9O;?  
  } 'v9M``  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 zw+RDo  
   for(int index=0;index<MAX_KEY;index++){ M\-[C!h,  
    if(hCallWnd[index]==NULL) =fJU+N+<  
     continue; &,yF{9$G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C+g}+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ~(8fUob  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 tDRo)z  
   } d%.|MAE  
  } E- [Eg  
 } A*~G[KC3(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n_Qua|R  
} X</Sl>[8  
J e,o(:  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: y0`; br\X  
;0Q" [[J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,n[<[tkCR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *5 .wwV  
NyT%S?@y<  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: @HPr;m!  
OTE,OCB[  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :P/VBXh  
{ PpKjjA<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) zyhM*eM.7  
 { (qvH=VTwP  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 jXLd#6  
  SaveBmp(); BGxwPJd  
  return FALSE; : NA(nA 3  
 } 3UaW+@  
 …… //其它处理及默认处理 qZ'2M.;  
} qxDMDMN  
"T{WOGU+  
Hy1$Kvub  
  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。 }Nd1'BVf  
>}\s-/  
  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。 f;Oh"Yt  
"[!b5f3!I  
  二、编程步骤 ' tY(&&  
!Ve0:$  
  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"; EQ ee5}  
qB (Pqv  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ?'Hd0)yZ  
LWm1j:0  
  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; 1O< 6=oH  
g4b#U\D@)/  
  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; IdN3Ea]  
|Y05 *!\P*  
  5、 添加代码,编译运行程序。 &R?`QB2/  
l cHf\~  
三、程序代码 ZnRT$ l O  
*Z^`H!&  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL  5{oc  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }oA>0Nw$K  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ )WbWp4  
#if _MSC_VER > 1000 KILX?Pt[7  
#pragma once U 7.kYu  
#endif // _MSC_VER > 1000 tE_n>~Zs  
#ifndef __AFXWIN_H__ `WN80d\)&  
#error include 'stdafx.h' before including this file for PCH >5#}/G&  
#endif NLY=o@<  
#include "resource.h" // main symbols NS2vA>n8R  
class CHookApp : public CWinApp z4Zm%  
{ v}N\z2A  
 public: |(Mxbprz  
  CHookApp(); &>C+5`bg  
  // Overrides "WuUMt  
  // ClassWizard generated virtual function overrides mjWU0.  
  //{{AFX_VIRTUAL(CHookApp) xi(1H1KN5B  
 public: 'fl< ac,.  
  virtual BOOL InitInstance(); 9D+k71"+  
  virtual int ExitInstance(); OPDT:e86Y=  
  //}}AFX_VIRTUAL zmGHI! tP  
  //{{AFX_MSG(CHookApp) n|)((W  
  // NOTE - the ClassWizard will add and remove member functions here. JR#4{P@A  
  // DO NOT EDIT what you see in these blocks of generated code ! j :B/ FL  
  //}}AFX_MSG uR :EH.K  
  DECLARE_MESSAGE_MAP() 4qp|g'uXT  
}; G(.G>8pf  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); n 5R9<A^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oG1zPspL  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); WM?-BIlT=  
BOOL InitHotkey(); ioD8-  
BOOL UnInit(); 9Z!n!o7D  
#endif ;W|NG3_y  
XDJE]2^52?  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Z::I3 Q  
#include "stdafx.h" O&BvWik  
#include "hook.h" fMg9h9U  
#include <windowsx.h> (&Rk#iU 2  
#ifdef _DEBUG NGSts\D'}  
#define new DEBUG_NEW d/ ^IL*O  
#undef THIS_FILE /]3[|  
static char THIS_FILE[] = __FILE__; QR#>Ws  
#endif K~vJ/9"|R  
#define MAX_KEY 100 t_jn-Idcf  
#define CTRLBIT 0x04 Rtz~:v%  
#define ALTBIT 0x02 qsp.`9!  
#define SHIFTBIT 0x01 FHQ`T\fC$@  
#pragma data_seg("shareddata") Au'y(KB  
HHOOK hHook =NULL; %rG4X  
UINT nHookCount =0; cyJ{AS+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey vvv'!\'#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT v,ZYh w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey d-B+s%>D  
static int KeyCount =0; ?-<lIF Fh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift m%`YAD@2z  
#pragma data_seg() jeWv~JA%L|  
HINSTANCE hins; f(w>(1&/B  
void VerifyWindow(); rZ `1G  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ih".y3  
//{{AFX_MSG_MAP(CHookApp) ;,[0bmL  
// NOTE - the ClassWizard will add and remove mapping macros here. v#qdq!64  
// DO NOT EDIT what you see in these blocks of generated code! 7-K8u  
//}}AFX_MSG_MAP ]}! @'+=  
END_MESSAGE_MAP() iVn4eLK^v  
JkJ @bh Eu  
CHookApp::CHookApp() ")No t$8  
{ |T""v_q  
 // TODO: add construction code here, ,~naKd.ZY  
 // Place all significant initialization in InitInstance ?d-w#<AiV  
} ;yomaAr  
9)1Ye  
CHookApp theApp; z qq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ~Mn3ADIb=  
{ ce\d35x!  
 BOOL bProcessed=FALSE; ]qT&6:;-]  
 if(HC_ACTION==nCode) -p_5T*R  
 { "iK= 8  
  if((lParam&0xc0000000)==0xc0000000){// Key up z9ADF(J?0'  
   switch(wParam) jXE:aWQht  
   { *I(6hB  
    case VK_MENU: (p%|F`  
     MaskBits&=~ALTBIT; -j3Lgm  
     break; CK7([>2  
    case VK_CONTROL: xUdGSr50  
     MaskBits&=~CTRLBIT; 0qJ (RB  
     break; :>fT=$i@  
    case VK_SHIFT: WT ;2aS:  
     MaskBits&=~SHIFTBIT; SUUNC06V  
     break; VhkM{O  
    default: //judge the key and send message MT&aH~YB  
     break; |X8?B =  
   } nv:Qd\UM  
   for(int index=0;index<MAX_KEY;index++){ 8D )nM|  
    if(hCallWnd[index]==NULL) ,~d0R4)  
     continue; U9:)qvMXe  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (&e!u{I  
    { D!o[Sm}JO[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); fIoc)T  
     bProcessed=TRUE; 4$KDf;m@  
    } tS2 &S 6u  
   } (kLaXayn  
  } @-)?uYw:r  
  else if((lParam&0xc000ffff)==1){ //Key down ^y/Es2A#t  
   switch(wParam) * hs&^G  
   { DU%E883  
    case VK_MENU: 5I2,za&e  
     MaskBits|=ALTBIT; src9EeiV  
     break; oFU:]+.+D  
    case VK_CONTROL: WVa%<  
     MaskBits|=CTRLBIT; Zt!#KSF7%  
     break; YbP @  
    case VK_SHIFT: ez'NHodwk2  
     MaskBits|=SHIFTBIT; s?EQ  
     break; -O *_+8f  
    default: //judge the key and send message 6j|Ncv  
     break; e3 v^j$  
   } 72s qt5C]  
   for(int index=0;index<MAX_KEY;index++) rC-E+%y  
   { oPmz$]_Z  
    if(hCallWnd[index]==NULL) u8zL[] >  
     continue; ;l*%IMB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +\T8`iCFB  
    { 3<^Up1CaZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); PeIx41. +s  
     bProcessed=TRUE; f]/2uUsg %  
    } 5 b} w  
   } S&!(h {O  
  } zo ?RFn  
  if(!bProcessed){ Y#9W]78He  
   for(int index=0;index<MAX_KEY;index++){ [MpWvLP"x  
    if(hCallWnd[index]==NULL) 7 XxZF43  
     continue; C.S BJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d0 )725Ia  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); zIrOMh  
   } GI]\  
  } sv=U^xI  
 } 0&,D&y%  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hQ@k|3=Re  
} 1cK'B<5">]  
XH?//.q  
BOOL InitHotkey() u}nSdZC  
{ %/Wk+r9uu  
 if(hHook!=NULL){ s:tX3X  
  nHookCount++; qk<jvha  
  return TRUE; b  Ssg`  
 } ]:gW+6w"C  
 else Ok_}d&A  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 9w=7A>.U  
  if(hHook!=NULL) +7gd1^|$e  
   nHookCount++; KmNnW1T  
  return (hHook!=NULL); |HmY`w6*z  
}  V;%ug'j  
BOOL UnInit() _;k<=ns(=  
{ ,H{9`a#+:  
 if(nHookCount>1){ 'SFAJ  
  nHookCount--; ,'s }g,L  
  return TRUE; Lu}jk W*  
 } %nZ:)J>kz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); c~vhkRA  
 if(unhooked==TRUE){ %hSQ\T<8[o  
  nHookCount=0; j,j|'7J%  
  hHook=NULL; >aAM&4  
 } eNd&47lJ  
 return unhooked; Lk !)G'42  
} -V}oFxk]q  
+aOdaNcI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %LrOGr  
{ L?h?LZnq  
 BOOL bAdded=FALSE; vIRT$W' O}  
 for(int index=0;index<MAX_KEY;index++){ fxd+0R;f  
  if(hCallWnd[index]==0){ '[WL8,.Q  
   hCallWnd[index]=hWnd; Z5v dH5?!r  
   HotKey[index]=cKey; vxmX5.  
   HotKeyMask[index]=cMask; -0^]:  
   bAdded=TRUE; g=t`3X#d  
   KeyCount++; v'i'I/  
   break; KZ%i&w#<  
  } |]9@JdmV  
 }  T01Iu  
 return bAdded; OIPY,cj~  
} u!K1K3T6k  
hS,&Nj+  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) xF[%R{Mn'  
{ 8s)b[Z5  
 BOOL bRemoved=FALSE; ]CzK{-W  
 for(int index=0;index<MAX_KEY;index++){ :K6JrS  
  if(hCallWnd[index]==hWnd){ W0f^!}f(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ PLkS-B  
    hCallWnd[index]=NULL; i47LX;}  
    HotKey[index]=0; zP,r,ok7  
    HotKeyMask[index]=0; 4k225~GQ:C  
    bRemoved=TRUE; D./{f8  
    KeyCount--; E]' f&0s  
    break; (u&x.J  
   } Or? )Nlg6x  
  } 7 FE36Ub9  
 }  tKV,  
 return bRemoved; "J"=<_?  
} (m R)o&Y%,  
-$:; en?  
void VerifyWindow() (F&LN!Hn>p  
{ b=5w>*  
 for(int i=0;i<MAX_KEY;i++){ G%I .u  
  if(hCallWnd!=NULL){ ]Kt@F0U<o  
   if(!IsWindow(hCallWnd)){ osXEzr(  
    hCallWnd=NULL; {5Bj*m5  
    HotKey=0; q}t]lD %C  
    HotKeyMask=0; @:?[R&`  
    KeyCount--; d^=)n-!T  
   } r!&174DSR1  
  } gxl7j Y  
 } V[(fE=cIN~  
} c-k3<|H`  
P*6m~`"5  
BOOL CHookApp::InitInstance() !.'D"Me>  
{ xqX3uq  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); A`uHZCwJ5  
 hins=AfxGetInstanceHandle(); r &.~ {  
 InitHotkey(); JN/=x2n.  
 return CWinApp::InitInstance(); UfX~GC;B  
} zcP=+Y)YA  
c]u ieig0~  
int CHookApp::ExitInstance() X<,QSTP  
{ }[akj8U  
 VerifyWindow(); #KiJ{w'  
 UnInit(); W_}j~[&  
 return CWinApp::ExitInstance(); BzfR8mD  
} BaQyn 6B  
E4% -*n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^t})T*hM0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q KD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,1{qZ(l1  
#if _MSC_VER > 1000 ~LuGfPO^  
#pragma once gL_1~"3KGC  
#endif // _MSC_VER > 1000 W/,bz",v3  
1O`V_d)  
class CCaptureDlg : public CDialog Po)U!5Tm  
{ YD[HBF)~j  
 // Construction 5[4wN( )  
 public: qHub+"2  
  BOOL bTray; -*k2:i`  
  BOOL bRegistered; &za }TH m  
  BOOL RegisterHotkey(); <J<"`xKL  
  UCHAR cKey; K80f_ iT 5  
  UCHAR cMask; ,,u hEoH  
  void DeleteIcon(); ;8^k=8  
  void AddIcon(); s>/Xb2\  
  UINT nCount; {g.YGO  
  void SaveBmp(); YIRe__7-NU  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor (c[u_~ ;  
  // Dialog Data TX=894{nGh  
  //{{AFX_DATA(CCaptureDlg) _p6 r5Y  
  enum { IDD = IDD_CAPTURE_DIALOG }; K? o p3}f?  
  CComboBox m_Key; |aP`hVm  
  BOOL m_bControl; ZR\N~.  
  BOOL m_bAlt; }*(_JR4G  
  BOOL m_bShift; \1Y|$:T/  
  CString m_Path; kf'(u..G  
  CString m_Number; ESB^"|9  
  //}}AFX_DATA  $U?]^  
  // ClassWizard generated virtual function overrides svmb~n&x6  
  //{{AFX_VIRTUAL(CCaptureDlg) Ef`'r))  
 public: B{)#A?Rh.  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >T]9.`xhK  
 protected: ~-k , $J?7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #//xOL3J  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &9flNoNR9  
  //}}AFX_VIRTUAL th73eC'  
  // Implementation ^W$R{`  
 protected: Hl}lxK,]  
  HICON m_hIcon;  :f[ w  
  // Generated message map functions eE'P)^KV  
  //{{AFX_MSG(CCaptureDlg) _O}m0c   
  virtual BOOL OnInitDialog(); p/ (Z2N"  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); #$Zx].[lc  
  afx_msg void OnPaint(); p?L%'  
  afx_msg HCURSOR OnQueryDragIcon(); (e'8>Pv  
  virtual void OnCancel(); _\4#I(  
  afx_msg void OnAbout(); :2KHiT5  
  afx_msg void OnBrowse(); =H)]HxEEM  
  afx_msg void OnChange(); d'96$e o~  
 //}}AFX_MSG trDw|WA  
 DECLARE_MESSAGE_MAP() !Wr<T!T  
}; uZL]mwkj]  
#endif 4m< ]qw  
x\Q}fk?{t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =p4n @C  
#include "stdafx.h" ]t)N3n6Bc  
#include "Capture.h" 9>4#I3  
#include "CaptureDlg.h" lC#wh2B6  
#include <windowsx.h> 9HJYrzf{%  
#pragma comment(lib,"hook.lib") oH w!~ c7  
#ifdef _DEBUG y>=YMD  
#define new DEBUG_NEW uMDd Zj&  
#undef THIS_FILE $=.%IJ_MAz  
static char THIS_FILE[] = __FILE__; &j:e<{@  
#endif :O413#8  
#define IDM_SHELL WM_USER+1 Pp } Z"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9;LjM ~Ct  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _fS\p|W(E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; /}6I3n  
class CAboutDlg : public CDialog B/l^=u+-  
{ n,FyK`x  
 public: ~+1mH  
  CAboutDlg(); KfjWZ4{v  
  // Dialog Data _+48(Q F<  
  //{{AFX_DATA(CAboutDlg) ht%qjE  
  enum { IDD = IDD_ABOUTBOX }; Az@@+?,%Y  
  //}}AFX_DATA _h<rVcl!wX  
  // ClassWizard generated virtual function overrides KNmU2-%l  
  //{{AFX_VIRTUAL(CAboutDlg) m+XHFU  
 protected: #8h7C8]&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DyqqY$ vH(  
  //}}AFX_VIRTUAL -]^JaQw  
  // Implementation ; +\h$  
 protected: Y#c439&  
  //{{AFX_MSG(CAboutDlg) MtL<)?HQ  
  //}}AFX_MSG %j^QK>%  
  DECLARE_MESSAGE_MAP() @K!JE w\  
}; pG"wQ  
 7V5c`:"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) eHvUgDt  
{ l8?C[, K%  
 //{{AFX_DATA_INIT(CAboutDlg) :jv(-RTI  
 //}}AFX_DATA_INIT C"kfxpCi  
} 6qDt 6uB  
%!t9)pNc  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r5xm7- `c  
{ X`_tm3HC  
 CDialog::DoDataExchange(pDX); 9@CRL=  
 //{{AFX_DATA_MAP(CAboutDlg) 8|@) #:  
 //}}AFX_DATA_MAP jv.tg,c_6  
} vk E]$4P[$  
i&H^xgm  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0]5X Tc3r  
 //{{AFX_MSG_MAP(CAboutDlg)  jfK&CA  
 // No message handlers ifS#9N|8  
 //}}AFX_MSG_MAP %JDQ[%3qY  
END_MESSAGE_MAP() L|WrdT D;  
GcN}I=4|  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Jw5@#j  
: CDialog(CCaptureDlg::IDD, pParent) 'GezIIaH  
{ Jd/d\P  
 //{{AFX_DATA_INIT(CCaptureDlg) d,?D '/  
  m_bControl = FALSE; )A*53>JV  
  m_bAlt = FALSE; =7e!'cF[  
  m_bShift = FALSE; Ze>R@rK  
  m_Path = _T("c:\\"); P Ptmh. }e  
  m_Number = _T("0 picture captured."); |a03S Zx  
  nCount=0; Lp-$Ie  
  bRegistered=FALSE; .+S%hT,v6i  
  bTray=FALSE; sxr,] @  
 //}}AFX_DATA_INIT d8;kM`U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 i tNuY<"  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Fk49~z   
} cEa8l~GC<  
0?ab'vYcp  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Jvc<j:{^w  
{ vWmp ?m  
 CDialog::DoDataExchange(pDX); tW~kn9glZ  
 //{{AFX_DATA_MAP(CCaptureDlg) +pgHCzwJE  
  DDX_Control(pDX, IDC_KEY, m_Key);  ^[SW07o~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); aPlEM_escS  
  DDX_Check(pDX, IDC_ALT, m_bAlt); } O+xs3Uv  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); iPl,KjGk  
  DDX_Text(pDX, IDC_PATH, m_Path); <xSh13<  
  DDX_Text(pDX, IDC_NUMBER, m_Number); &-FG}|*4M  
 //}}AFX_DATA_MAP =c \(]xX  
} f|(9+~K/7&  
Il4]1d|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) J>#hu3&UOQ  
//{{AFX_MSG_MAP(CCaptureDlg) ~x(|'`  
 ON_WM_SYSCOMMAND() iLv -*%%  
 ON_WM_PAINT() 3r#['UmT  
 ON_WM_QUERYDRAGICON() 5|0/$ SWd*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?,7!kTRH  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Es#:0KH].v  
 ON_BN_CLICKED(ID_CHANGE, OnChange) '^m'r+B"  
//}}AFX_MSG_MAP vfn[&WN]  
END_MESSAGE_MAP() FVkl# Qy~  
5uG^`H@X  
BOOL CCaptureDlg::OnInitDialog() ?@PSD\  
{ P9m  
 CDialog::OnInitDialog(); a$?d_BX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); z\<,}x}V  
 ASSERT(IDM_ABOUTBOX < 0xF000); ma-GvWD2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Lk]|;F-2i  
 if (pSysMenu != NULL) 9h+Hd&=  
 { ,j>FC j>  
  CString strAboutMenu; @7"n X  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9=$ pV==  
  if (!strAboutMenu.IsEmpty()) ' *XIp:  
  { l?"^2in .  
   pSysMenu->AppendMenu(MF_SEPARATOR); sg-^ oy*^  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /-!Fr:Ox>  
  } l8(9?!C  
 } #Tzs9Bkaca  
 SetIcon(m_hIcon, TRUE); // Set big icon ~Y f8,m  
 SetIcon(m_hIcon, FALSE); // Set small icon l"[.Q>d  
 m_Key.SetCurSel(0); E4o{Z+C  
 RegisterHotkey(); 8F<|.V;  
 CMenu* pMenu=GetSystemMenu(FALSE);  .?CaU  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); e8f 7*S8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); /"="y'Wx  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); %S"z9@  
 return TRUE; // return TRUE unless you set the focus to a control 075IW"p'  
} Q3& ?28  
H (K!{k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) %CnVK1u!  
{ |qguLab(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) I 2AQ G  
 { x1`w{5;C 2  
  CAboutDlg dlgAbout; KsTGae;ds  
  dlgAbout.DoModal(); q p}2  
 } HfH+U&  
 else  1H.;r(c  
 { h{o,*QL  
  CDialog::OnSysCommand(nID, lParam); `+(n+QS _  
 } bxPa|s?  
} kD+#|f  
Zs}h>$E5_B  
void CCaptureDlg::OnPaint() PW%ith1)<  
{ vv)w@A:Vn)  
 if (IsIconic()) y|B HSc3  
 { uPcx6X3]  
  CPaintDC dc(this); // device context for painting q]f7D\ M  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); i@6g9\x+  
  // Center icon in client rectangle |FT.x9e-  
  int cxIcon = GetSystemMetrics(SM_CXICON); m;"[b (u  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~t2" L|i  
  CRect rect; U) xeta+  
  GetClientRect(&rect); %!-t7K^mFq  
  int x = (rect.Width() - cxIcon + 1) / 2;  *`qI<]!  
  int y = (rect.Height() - cyIcon + 1) / 2; w(_:+-rqQ<  
  // Draw the icon L-U4 8 i  
  dc.DrawIcon(x, y, m_hIcon); p`&{NR3+  
 } ?>ZrdfTwz,  
 else c8]%,26.  
 { h*KDZ+{)  
  CDialog::OnPaint(); A #SO}c  
 } c)Ef]E\  
} "i&n;8?Y  
K)l*$h&-  
HCURSOR CCaptureDlg::OnQueryDragIcon() D`Vb3aNB=L  
{ ?nu<)~r53  
 return (HCURSOR) m_hIcon; J R~s`>2  
}  h8p{  
Xo(W\Pes  
void CCaptureDlg::OnCancel() JcP<@bb>B  
{ HL[V}m  
 if(bTray) g3vbskY|  
  DeleteIcon(); SZ4y\I  
  CDialog::OnCancel(); NE`;=26c  
} VIGLl'8p  
=&-.]| t  
void CCaptureDlg::OnAbout() ZR3sz/ulLd  
{ :T6zT3(")D  
 CAboutDlg dlg; Bk.`G)t  
 dlg.DoModal(); l0yflFGr  
} y#Nrq9r:  
S]T71W<i  
void CCaptureDlg::OnBrowse() <MO40MP  
{ ;>>:7rdYt  
 CString str; H.n|zGQTB  
 BROWSEINFO bi; { ~{D(k  
 char name[MAX_PATH]; R(y`dQy<K  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 8zeD%Uv  
 bi.hwndOwner=GetSafeHwnd(); v(sS$2J|}  
 bi.pszDisplayName=name; @:'E9J06  
 bi.lpszTitle="Select folder"; ]+^4Yq>2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %^I 7=  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); vcy+p]6KE-  
 if(idl==NULL) b0%#=KMi  
  return; gi@&Mr)fS  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); DT;;4- {  
 str.ReleaseBuffer(); ou|3%&*"  
 m_Path=str; b[n6L5P5m2  
 if(str.GetAt(str.GetLength()-1)!='\\') @ohJ'  
  m_Path+="\\"; _fj@40i M  
 UpdateData(FALSE); Um/ g&k  
}  q _;#EV  
LWM& k#i  
void CCaptureDlg::SaveBmp() 86&r;c:  
{ R*dXbI&,e  
 CDC dc; Ax!@vL&@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ^CDh! )  
 CBitmap bm; I.6#>=  
 int Width=GetSystemMetrics(SM_CXSCREEN); n n8N 9w  
 int Height=GetSystemMetrics(SM_CYSCREEN); ZZ0b!{qj3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); |])Ko08*tE  
 CDC tdc; 3@;24X  
 tdc.CreateCompatibleDC(&dc); [.G~5%974  
 CBitmap*pOld=tdc.SelectObject(&bm); }2?-kj7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Si#XF[/  
 tdc.SelectObject(pOld); _{i- .;K  
 BITMAP btm; OJcI0(G  
 bm.GetBitmap(&btm); g;3<oI/P  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^&c|z35F  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); q*J-ii  
 BITMAPINFOHEADER bih; kA4kQ}q  
 bih.biBitCount=btm.bmBitsPixel; #DTBdBh?I  
 bih.biClrImportant=0; EX3;|z@5;  
 bih.biClrUsed=0; '(($dT  
 bih.biCompression=0; U@:iN..  
 bih.biHeight=btm.bmHeight; BS3BJwf; f  
 bih.biPlanes=1; G!ryW4  
 bih.biSize=sizeof(BITMAPINFOHEADER); ybm&g( -\  
 bih.biSizeImage=size; s.}:!fBk  
 bih.biWidth=btm.bmWidth; {-5 b[m(  
 bih.biXPelsPerMeter=0; '&xRb*  
 bih.biYPelsPerMeter=0; a<D]Gz^h  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ;}4e+`fF|  
 static int filecount=0; MES|iB  
 CString name; I1Gk^wO  
 name.Format("pict%04d.bmp",filecount++); ;{>-K8=>$  
 name=m_Path+name; b WZ X  
 BITMAPFILEHEADER bfh; g!;Hv  
 bfh.bfReserved1=bfh.bfReserved2=0; F>3fP  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2ld0w=?+eu  
 bfh.bfSize=54+size; .3,Ow(3l  
 bfh.bfOffBits=54; p@xK`=Urb  
 CFile bf; ;V~~lcD&Y`  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ }JWk?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [SLBA_d  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); m4T` Tg#P  
  bf.WriteHuge(lpData,size); laFF/g;sRC  
  bf.Close(); h|=&a0  
  nCount++; J 9k~cz  
 } w.0]>/C  
 GlobalFreePtr(lpData); h5#V,$  
 if(nCount==1) le`_    
  m_Number.Format("%d picture captured.",nCount); gI~jf- w  
 else G9\@&=  
  m_Number.Format("%d pictures captured.",nCount); lhV'Q]s@6  
  UpdateData(FALSE); .7GAGMNS  
} R_DZJV O  
oG;;='*  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V$ss[fX  
{ s%qK<U4@;Q  
 if(pMsg -> message == WM_KEYDOWN) ]+0I8eerd  
 { =G2A Ufn   
  if(pMsg -> wParam == VK_ESCAPE) e_pyjaY!s  
   return TRUE; Ax+q/nvnb  
  if(pMsg -> wParam == VK_RETURN) vo DTU]pf  
   return TRUE; ?l<u%o  
 } 76*5/J-  
 return CDialog::PreTranslateMessage(pMsg); ~v<,6BS<$Z  
} u kKp,1xz  
w,FOq?j^k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) rRZ ,X%  
{ sh"\ kk9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2L_ts=  
  SaveBmp(); bMw)> 4  
  return FALSE; lTv_%hUp  
} !M&B=vk4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ G(~"Zt}?  
 CMenu pop; (yel  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Ea*Jl<  
 CMenu*pMenu=pop.GetSubMenu(0); V qW(S1w  
 pMenu->SetDefaultItem(ID_EXITICON); f)+fdc  
 CPoint pt; ojH-;|f  
 GetCursorPos(&pt); ~FV Z0%+,  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 9WuKW***  
 if(id==ID_EXITICON) vb.`rj6  
  DeleteIcon(); _,4f z(  
 else if(id==ID_EXIT) Ls^$E  
  OnCancel(); =2eG j'}  
 return FALSE; `cr.C|RT:  
} S)*eAON9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ^CwzA B  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 6!n%SUt  
 AddIcon(); b1;80P/:D  
 return res; )xQA+$H#4  
} [ Q6v#I  
1vQj` F  
void CCaptureDlg::AddIcon() 0:(@Y  
{ ukSi9| 1-,  
 NOTIFYICONDATA data; $fY4amX6Z  
 data.cbSize=sizeof(NOTIFYICONDATA); rX#} 2  
 CString tip; ` 0k  
 tip.LoadString(IDS_ICONTIP); LPk85E  
 data.hIcon=GetIcon(0); \TrhJ  
 data.hWnd=GetSafeHwnd(); ~WJEH#  
 strcpy(data.szTip,tip); @BN cIJk9  
 data.uCallbackMessage=IDM_SHELL; |f~p3KCfV  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 'I_\ELb_  
 data.uID=98; 5xHl6T+  
 Shell_NotifyIcon(NIM_ADD,&data); r=+r5k"`  
 ShowWindow(SW_HIDE); T(^<sjOs  
 bTray=TRUE; &4yI]  
} $CVbc%  
)*iSN*T8q  
void CCaptureDlg::DeleteIcon() P$\vD^  
{ GIDC'  
 NOTIFYICONDATA data; eRa1eR gP  
 data.cbSize=sizeof(NOTIFYICONDATA); '7{0k{  
 data.hWnd=GetSafeHwnd(); :R<n{%~  
 data.uID=98; yl%F}kBR  
 Shell_NotifyIcon(NIM_DELETE,&data); z rt8ze=Su  
 ShowWindow(SW_SHOW); @&]j[if (s  
 SetForegroundWindow(); C/+8lA6NV  
 ShowWindow(SW_SHOWNORMAL); '+ |{4-V  
 bTray=FALSE; 4 |N&Y  
} $N=A,S  
G~e`O,+  
void CCaptureDlg::OnChange() c]W]m`:  
{ ge[+/$(1  
 RegisterHotkey(); S3Tww]q  
} AtA}OY]D /  
CBTa9|57  
BOOL CCaptureDlg::RegisterHotkey() ?/~7\ '|Z  
{ xU^Flw,4  
 UpdateData(); ]v 6u  
 UCHAR mask=0; % j7lLSusX  
 UCHAR key=0; r 8,6qP[  
 if(m_bControl) EpCUL@+  
  mask|=4; eGblQGRS  
 if(m_bAlt) SN'LUwaMp!  
  mask|=2; =1%3". "n@  
 if(m_bShift) l\*}  
  mask|=1; J%;TK6  
  key=Key_Table[m_Key.GetCurSel()]; R)#D{/#FW  
 if(bRegistered){ ewk62 {  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); H>`?S{J  
  bRegistered=FALSE; [Qv%  
 } c`y[V6q9  
 cMask=mask; fdN-Zq@'  
 cKey=key; N@^?J@#V  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ])a?ri  
 return bRegistered; ]RQQg,|D  
} V2'(}k  
#T n~hnW  
  四、小结 ?PSm) ~ Oa  
8Hs>+Udl  
  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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