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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: TTNk r`  
  E|"=. T  
  一、实现方法 =H7xD"'%R  
`rY2up#%  
  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: )n7l'}o?+  
)YW<" $s  
#pragma data_seg("shareddata") 79J-)e9  
HHOOK hHook =NULL; //钩子句柄 92W&x'  
UINT nHookCount =0; //挂接的程序数目 DLE8+NV8   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 vy@rQC %9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 WUdKLx %F  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey e= P  
static int KeyCount =0; J a,d3K  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 r~[vaQQ6L  
#pragma data_seg() m,LG=s  
ig"uXs  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 d=.2@Ry  
3Q}$fQ&S  
  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: !,$i6gm  
^u)z{.z'H/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR qf'm=efRyu  
cKey,UCHAR cMask) 5@osnf?  
{ {WN(&eax  
 BOOL bAdded=FALSE; -!qu"A:  
 for(int index=0;index<MAX_KEY;index++){ w6|9|f/  
  if(hCallWnd[index]==0){ XP[uF ;w  
   hCallWnd[index]=hWnd; K5Wg"^AHY/  
   HotKey[index]=cKey; 1tzV8(7  
   HotKeyMask[index]=cMask; u}hF8eD  
   bAdded=TRUE; ,M !tm7  
   KeyCount++; G* %t'jX9  
   break; wl=61 Mb  
  } tEd.'D8 s  
 } sf} Dh  
 return bAdded; % u{W7  
} JD>d\z2QC  
//删除热键 igf )Hb;5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ha>*?`?yI  
{ $Byj}^;1  
 BOOL bRemoved=FALSE; iSRpfU  
 for(int index=0;index<MAX_KEY;index++){ &tR(n$ M@>  
  if(hCallWnd[index]==hWnd){ jP vDFT^d/  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ td2/9|Q  
    hCallWnd[index]=NULL; w-B^ [<  
    HotKey[index]=0; R  
    HotKeyMask[index]=0; u?ek|%Ok  
    bRemoved=TRUE; 8Chj w wB  
    KeyCount--; !4@G3Ae22  
    break; #4LFG\s  
   } Huw\&E  
  } 0x2!<z  
 } Zx }&c |Q  
 return bRemoved; Z]w# vLR  
} vQVK$n`  
bte~c  
{'+Q H)w(  
  DLL中的钩子函数如下: fpyz'   
qr\ !*\9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) I<b?vR 'F  
{ VvbFp  
 BOOL bProcessed=FALSE; MWk:sBCqr  
 if(HC_ACTION==nCode) +eX)48  
 { | aQ"3d  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 EUYCcL'G  
   switch(wParam) 1x J TWWj-  
   {  Gm`}(;(A  
    case VK_MENU: TOF '2&H  
     MaskBits&=~ALTBIT; vh!v MB}}  
     break; NIr@R7MKd  
    case VK_CONTROL: k`HP "H  
     MaskBits&=~CTRLBIT; `[#x_<\t  
     break; :m=m}3/:  
    case VK_SHIFT: OIHz I2{  
     MaskBits&=~SHIFTBIT; u]^N&2UW  
     break; [mxTa\  
    default: //judge the key and send message Dz=k7zRg"  
     break; Rr(* aC2P  
   } (oK^c- x  
   for(int index=0;index<MAX_KEY;index++){ iyZZ}M  
    if(hCallWnd[index]==NULL) ylf[/='0K  
     continue; kyh_9K1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u D 5%E7  
    { ulHn#)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8 S`9dSc  
     bProcessed=TRUE; 3Rg}+[b  
    } fyz nuUl  
   } /NT[ETMk+  
  } @(``:)Z<b  
  else if((lParam&0xc000ffff)==1){ //有键按下 *MN HT`Y^o  
   switch(wParam) a>4uiFiv  
   { 2g*J  
    case VK_MENU: 'J*<iA*W  
     MaskBits|=ALTBIT; BIaDY<j90  
     break; h.rD}N\L  
    case VK_CONTROL: ~s Qjl]  
     MaskBits|=CTRLBIT; ?zJpD8e  
     break; fqz28aHh  
    case VK_SHIFT: C`rLj5E%  
     MaskBits|=SHIFTBIT; Oh.ZPG=  
     break; *x~xWg9^  
    default: //judge the key and send message / il@`w;G  
     break; #yseiVm;  
   } (LvS :?T}  
   for(int index=0;index<MAX_KEY;index++){ iVtl72O  
    if(hCallWnd[index]==NULL) 2s*#u<I  
     continue; {cK^,?x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }y%`)lz~;  
    { :H6FPV78  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +1C3`0(  
     bProcessed=TRUE; wyx(FinIH  
    } "Y`3DxXz  
   } T[k4lM  
  } C;AA/4Ib  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _s,ao '/  
   for(int index=0;index<MAX_KEY;index++){ :_<_[Y]1  
    if(hCallWnd[index]==NULL) ukgAI<O%  
     continue; zHWSE7!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?B@;QjhjiJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mN `YuR~  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 i[C~5}%  
   } 'PZ|:9FX!  
  } e[u?_h  
 } {",MCu_V  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); yAT^VRbv  
} {s?M*_{|  
14eW4~Mr  
  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: os3 8u!3-  
CDj~;$[B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )'4P.>!!aQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); rsn.4P=  
(w (  
  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: %U7.7dSOI;  
-b&{+= ^c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  v7  
{ }/dRU${!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ubsSa}$q  
 { #BVtL :x@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 I:&/`K4,x,  
  SaveBmp(); R9We/FhOY  
  return FALSE; U=Y)V%  
 } 1[F3 Z  
 …… //其它处理及默认处理 a`9L,8Ve  
} ?rVy2!  
F~#zxwd  
6dH }]~a  
  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。 h!@|RW&}qX  
<^.=>Q0 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。 }_tln  
`cz2DR-"  
  二、编程步骤 j*@l"V>~  
[sV"ws  
  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"; 2Q7R6*<N:  
<F7kh[L_x  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <`X"}I3 ba  
t9 \x%=  
  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; "eWk#/  
 @4d)R  
  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!2TH~zl  
oeSN9O  
  5、 添加代码,编译运行程序。 zQ?!f#f  
'mCe=Y  
三、程序代码 WFR?fDtE  
^VW PdH/Fe  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $w)~O<_U  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) TlL^7f}  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ C,V%B  
#if _MSC_VER > 1000 1sE?YJP-  
#pragma once O-]mebTvw  
#endif // _MSC_VER > 1000 qs\2Z@;  
#ifndef __AFXWIN_H__ !J1rRPV  
#error include 'stdafx.h' before including this file for PCH _cTh#t ^  
#endif 'oNO-)p\#!  
#include "resource.h" // main symbols DBLk!~IF  
class CHookApp : public CWinApp *,C(\!b !?  
{ _$NIp `d  
 public: q>f<u&  
  CHookApp(); (z7vl~D  
  // Overrides r0t^g9K0  
  // ClassWizard generated virtual function overrides # ?1Sm/5k`  
  //{{AFX_VIRTUAL(CHookApp) $CTSnlPq  
 public: *b *G2f^  
  virtual BOOL InitInstance(); e+v({^k  
  virtual int ExitInstance(); n8=5-7UT  
  //}}AFX_VIRTUAL # ,uya2!)  
  //{{AFX_MSG(CHookApp) m p<1yY]  
  // NOTE - the ClassWizard will add and remove member functions here. <99M@ cF  
  // DO NOT EDIT what you see in these blocks of generated code ! ]Y6cwZOe  
  //}}AFX_MSG -m'j]1  
  DECLARE_MESSAGE_MAP() ^2d!*W|  
}; AT2v!mNyCw  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); %:>3n8n  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {^CT} \=>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hc (e$##  
BOOL InitHotkey(); 0.$hn  
BOOL UnInit(); Rtb :nJ8  
#endif v}@xlB=  
M7f;Pa  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #ywk|k5z]  
#include "stdafx.h" M)*\a/6?{  
#include "hook.h" 6-`|:[Q~  
#include <windowsx.h> QY/hI `  
#ifdef _DEBUG DU%w1+u  
#define new DEBUG_NEW 1}hIW":3Sr  
#undef THIS_FILE 4%WzIzRb  
static char THIS_FILE[] = __FILE__; ~/NKw:  
#endif ZZ QG?("S'  
#define MAX_KEY 100 YDC mI@  
#define CTRLBIT 0x04 f~E*Zz`;  
#define ALTBIT 0x02 {NpM.;  
#define SHIFTBIT 0x01 _0+0#! J!  
#pragma data_seg("shareddata") 6s,uXn  
HHOOK hHook =NULL; ^@P1 JNe  
UINT nHookCount =0; x@mL $  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f)]%.>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT AV 8n(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey _'4A|-9  
static int KeyCount =0; NmK8<9`u  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 01!s"wjf  
#pragma data_seg() V)Z70J <'  
HINSTANCE hins; d]9U^iy  
void VerifyWindow(); Iff9'TE  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) '65LKD  
//{{AFX_MSG_MAP(CHookApp) ~HQ9i%exg  
// NOTE - the ClassWizard will add and remove mapping macros here. ntNI]~z&  
// DO NOT EDIT what you see in these blocks of generated code! R1&unm0  
//}}AFX_MSG_MAP f= >O J!:  
END_MESSAGE_MAP() 1+b{}d  
'|;X0fD  
CHookApp::CHookApp() =b;>?dP  
{ y@CHR  
 // TODO: add construction code here, Y*_)h\f  
 // Place all significant initialization in InitInstance 'B+ ' (f  
} u3Gjg{-N7  
 $R<Me  
CHookApp theApp; nRd)++  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4|A>b})H  
{ zByT$P-  
 BOOL bProcessed=FALSE; ceNix!P  
 if(HC_ACTION==nCode) B^).BQ  
 { aq7~QX_0G  
  if((lParam&0xc0000000)==0xc0000000){// Key up "3FihE]k  
   switch(wParam) 5s(1[(  
   { $mF_,|  
    case VK_MENU: "~TA SX_?  
     MaskBits&=~ALTBIT; ? ` SUQm  
     break; c8Z wr]DF  
    case VK_CONTROL: vb9OonE2  
     MaskBits&=~CTRLBIT; E2)h ?cs  
     break; hsu{eyp  
    case VK_SHIFT: fnx-s{c?  
     MaskBits&=~SHIFTBIT; q7u'_ R,;  
     break; UMX@7a,[3  
    default: //judge the key and send message Z{'i F   
     break; tTd\|  
   } X.`~>`8  
   for(int index=0;index<MAX_KEY;index++){ !3T&4t  
    if(hCallWnd[index]==NULL) x@8a''  
     continue; KZ~*Nz+H2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R$zH]  
    { f6$b s+oP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q -8t'7  
     bProcessed=TRUE; 3Hf0MAt  
    } iR"N13  
   } ;c$J=h]  
  } .k,YlFvj  
  else if((lParam&0xc000ffff)==1){ //Key down O|_h_I-2  
   switch(wParam) C]Q8:6b  
   { ^*fQX1h<  
    case VK_MENU: FVh U^  
     MaskBits|=ALTBIT; I%urz!CNE*  
     break; Q_l'o3  
    case VK_CONTROL:  }-~l!  
     MaskBits|=CTRLBIT; s&'QN=A  
     break; \W1/p`  
    case VK_SHIFT: [9:9Ql_h  
     MaskBits|=SHIFTBIT; a&vY!vx 3  
     break; 4tY ss  
    default: //judge the key and send message W`^@)|9^)  
     break; E!S 78 z:  
   } nS>8bub30  
   for(int index=0;index<MAX_KEY;index++) [$[:"N_  
   { *hcYGLx r  
    if(hCallWnd[index]==NULL) cu+FM  
     continue; m.,U:>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I!^O)4QRx  
    { fFQ|T:vm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [` sL?&a  
     bProcessed=TRUE; #:SNHM^><  
    } 4`,j = 3  
   } Dc)dE2  
  } s.8{5jVG  
  if(!bProcessed){ :6%Z]tt  
   for(int index=0;index<MAX_KEY;index++){ B7imV@<  
    if(hCallWnd[index]==NULL) s&j-\bOic9  
     continue; =hl}.p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v$^Z6>vVI  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); NO :a;  
   } rx}r~0i  
  } GgKEP,O  
 } )p*}e8L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .1LCXW=  
} $8BPlqBIZ  
i~r l o^  
BOOL InitHotkey() z;y:9l  
{ 3po:xMY  
 if(hHook!=NULL){ IsR!'%Pu  
  nHookCount++; !W?gR.0$=  
  return TRUE; Kv~U6_=1O  
 } XC+A_"w)  
 else S{3nM<  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); JfPD}w  
  if(hHook!=NULL) G}p\8Q}'  
   nHookCount++; 'F3)9&M  
  return (hHook!=NULL); qgrg CJ  
} vx4+QQY P  
BOOL UnInit() mkR2i>  
{ &4_qF^9J  
 if(nHookCount>1){ i&n'N8D@  
  nHookCount--; /t(C>$ }p  
  return TRUE; &iV{:)L  
 } dUsx vho  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h yv2SxP*  
 if(unhooked==TRUE){ 2PG [7u^  
  nHookCount=0; "Iix )Ue  
  hHook=NULL; g&{9VK6.  
 } =z8f]/k*>  
 return unhooked; i7ly[6{^pr  
} VH:]@x//{  
yDGVrc'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GAAm0;  
{ {^N[("`  
 BOOL bAdded=FALSE; P67o{EdK  
 for(int index=0;index<MAX_KEY;index++){ 5scEc,JCi  
  if(hCallWnd[index]==0){ AoyX\iqQ  
   hCallWnd[index]=hWnd; $.bBFWk  
   HotKey[index]=cKey; 9H%X2#:fH  
   HotKeyMask[index]=cMask; h;0S%ZC  
   bAdded=TRUE; +U@<\kIF  
   KeyCount++; ZzX~&95G  
   break; n?c]M  
  } &zo|Lfe  
 } Sf r&p>{,  
 return bAdded; S.a%  
} XO'l Nb.  
.rf" (lM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y8DhOlewQ  
{ ZIF49`Y4TF  
 BOOL bRemoved=FALSE; 12+>5BA  
 for(int index=0;index<MAX_KEY;index++){ FKmFo^^0  
  if(hCallWnd[index]==hWnd){  Sr?#S  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ LlSZr)X  
    hCallWnd[index]=NULL; Hik3wPnp  
    HotKey[index]=0; *<!oHEwkN  
    HotKeyMask[index]=0; !Xph_SQ!B=  
    bRemoved=TRUE; dc rSz4E|>  
    KeyCount--; )Qvk*9OS  
    break; x)_0OR2lkp  
   } n\Lb.}]1~  
  } l\n@cQR  
 } kTvd+TP4  
 return bRemoved; 9 '2_  
} YtWJX kB  
~#/hzS  
void VerifyWindow() C7O6qpO  
{ 1w&!H ]%{  
 for(int i=0;i<MAX_KEY;i++){ *2X0^H|dS  
  if(hCallWnd!=NULL){ 3=L.uXVb  
   if(!IsWindow(hCallWnd)){ Ft!],n-n*  
    hCallWnd=NULL; Tq~=TSD  
    HotKey=0; i _%Q`i  
    HotKeyMask=0; s@7H1)U  
    KeyCount--; )sT> i  
   } /7YF mI/0  
  } YSe.t_K2C  
 } 9tqF8pb7v  
} PV=5UyjW  
Gmz6$^D   
BOOL CHookApp::InitInstance() ?pza G{  
{ 5;{H&O9Q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @n": w2^B  
 hins=AfxGetInstanceHandle(); "T- `$'9  
 InitHotkey(); X<*U.=r)  
 return CWinApp::InitInstance(); jNC4_q&  
} y? co|  
2TA*m{\Hr  
int CHookApp::ExitInstance() L5\WpM=  
{ eET}r 24  
 VerifyWindow(); >MvDVPi~+  
 UnInit(); >HS W]"k  
 return CWinApp::ExitInstance(); *~x/=.}  
} 0/oyf]HR  
9,"L^W8"k  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Kc^;vT>3  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) LoGVwRmoC  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Y(cGk#0  
#if _MSC_VER > 1000 W}]%X4<#rN  
#pragma once NSDv ;|f  
#endif // _MSC_VER > 1000 _zwUE  
'uxX5k/D@t  
class CCaptureDlg : public CDialog s]JF0584  
{ wg]j+r@  
 // Construction yYH0v7vx+  
 public: |x-S&-  
  BOOL bTray; Mwr"~?\\  
  BOOL bRegistered; .uk>QM s1  
  BOOL RegisterHotkey(); smDw<slC  
  UCHAR cKey; d8x\  
  UCHAR cMask; '^"6+k  
  void DeleteIcon(); X.e7A/ClEo  
  void AddIcon(); 5>\/[I/!  
  UINT nCount; [ E ]E  
  void SaveBmp(); c*@E_}C#  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor w:<W.7y?0  
  // Dialog Data _}En/V_  
  //{{AFX_DATA(CCaptureDlg) 9^p;UA  
  enum { IDD = IDD_CAPTURE_DIALOG }; 4BKI-;v$  
  CComboBox m_Key; \<)9?M :  
  BOOL m_bControl; 4zo5}L `Y  
  BOOL m_bAlt; % V ;?  
  BOOL m_bShift; E!P yL>){  
  CString m_Path; y7i*s^ys{  
  CString m_Number; K]9"_UnN  
  //}}AFX_DATA k4 [|'Dk?  
  // ClassWizard generated virtual function overrides d $Pab*  
  //{{AFX_VIRTUAL(CCaptureDlg) 2 FW \O0U  
 public: 9amaL~m  
  virtual BOOL PreTranslateMessage(MSG* pMsg); C-H@8p?T  
 protected: `u&Zrdr,  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gjAIEI  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ixT:)|'i  
  //}}AFX_VIRTUAL )}?#  
  // Implementation B,=H@[Fj  
 protected: /x1![$oC0  
  HICON m_hIcon; &mtJRfnu  
  // Generated message map functions HI11Jl}{  
  //{{AFX_MSG(CCaptureDlg) =^5Alb a/  
  virtual BOOL OnInitDialog(); KW^7H  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); y;o^- O  
  afx_msg void OnPaint(); &Ob!4+v/GP  
  afx_msg HCURSOR OnQueryDragIcon(); $ . 9V&  
  virtual void OnCancel(); >\Ww;1yV  
  afx_msg void OnAbout(); O6G0  
  afx_msg void OnBrowse(); :H wA 5Z#  
  afx_msg void OnChange(); [+DW >Et  
 //}}AFX_MSG <U\B!fO'  
 DECLARE_MESSAGE_MAP() gY8>6'~mS  
}; @("a.;1#o  
#endif p$3sME$L  
 _ "VkGG  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file e!=kWc  
#include "stdafx.h" 4Q6mo/=H  
#include "Capture.h" `.Qi?* ^  
#include "CaptureDlg.h" &?yZv {  
#include <windowsx.h> VQS~\:1  
#pragma comment(lib,"hook.lib") ~15N7=wCM  
#ifdef _DEBUG z3;*Em8Ir  
#define new DEBUG_NEW _zwG\I|Q  
#undef THIS_FILE h9G RI  
static char THIS_FILE[] = __FILE__; MfWyc_  
#endif T r1?620  
#define IDM_SHELL WM_USER+1 d5gR"ja  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {*I``T_+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?qWfup\S  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @6]sNm  
class CAboutDlg : public CDialog L$E{ycn  
{ 8Hn|cf0  
 public: #kaY0M  
  CAboutDlg(); [.uG5%fa  
  // Dialog Data K8UP,f2  
  //{{AFX_DATA(CAboutDlg) %*0^0wz  
  enum { IDD = IDD_ABOUTBOX }; 8Y7Q+p|O  
  //}}AFX_DATA /q`xCS  
  // ClassWizard generated virtual function overrides 0p}D(m2B  
  //{{AFX_VIRTUAL(CAboutDlg) 2 Cv4=S  
 protected: YLzx<~E4a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2-Ej4I~  
  //}}AFX_VIRTUAL W1|0Yd ;P  
  // Implementation zIu E9l  
 protected: 7B\Vs-d  
  //{{AFX_MSG(CAboutDlg) zPjHsulK  
  //}}AFX_MSG 9E>|=d|(d  
  DECLARE_MESSAGE_MAP() !~rY1T~  
}; NP/Gn6fr  
f m)pulz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 'g m0)r  
{ A"G 1^8wvX  
 //{{AFX_DATA_INIT(CAboutDlg) Yd=>K HVD  
 //}}AFX_DATA_INIT sEGO2xeI  
} .@@?Pj?)  
K)DDk9*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) j;-1J_e5  
{ ?-dX`n  
 CDialog::DoDataExchange(pDX); ;E3>ay6m8  
 //{{AFX_DATA_MAP(CAboutDlg) <?riU\-]y  
 //}}AFX_DATA_MAP [nrYpb4  
} A Sk|A!  
6MT1$7|P&x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) #0P$M!%  
 //{{AFX_MSG_MAP(CAboutDlg) :?g:~+hfO  
 // No message handlers $',K7%y  
 //}}AFX_MSG_MAP z4jR[x,  
END_MESSAGE_MAP() lrIS{MJ+-  
}:KEj_~.  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zGA q-<  
: CDialog(CCaptureDlg::IDD, pParent) _0]S69lp  
{ #/Vh|UeX  
 //{{AFX_DATA_INIT(CCaptureDlg) PE3vQH=t~  
  m_bControl = FALSE; mR?5G: W~R  
  m_bAlt = FALSE; ~nh:s|l6%M  
  m_bShift = FALSE; pxCK;]  
  m_Path = _T("c:\\"); S/e2P|}  
  m_Number = _T("0 picture captured."); C(#u[8  
  nCount=0; pu 7{a  
  bRegistered=FALSE; 0;AA/  
  bTray=FALSE; ?&63#B,iZ  
 //}}AFX_DATA_INIT /tf5Bv'<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !O:y@  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); y}My.c  
} 8o'_`{ba  
:+z4~% jA  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) "AnC?c9?-^  
{ uj R_"r|l  
 CDialog::DoDataExchange(pDX); JNt^ (z  
 //{{AFX_DATA_MAP(CCaptureDlg) r0+6evU2  
  DDX_Control(pDX, IDC_KEY, m_Key); SEGri#s  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); @,cowar*  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ,D]QxbwZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); pgE}NlW  
  DDX_Text(pDX, IDC_PATH, m_Path); v*SEb~[  
  DDX_Text(pDX, IDC_NUMBER, m_Number); N343qU  
 //}}AFX_DATA_MAP Py@wJEo  
} OZ |IA:,}  
qUob?| ^   
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P3)Nl^/  
//{{AFX_MSG_MAP(CCaptureDlg) X\@C.H2ttY  
 ON_WM_SYSCOMMAND() YkniiB[/  
 ON_WM_PAINT() w35J.zn  
 ON_WM_QUERYDRAGICON() ]+XYEv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) xp }hev^@$  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2(u,SQ  
 ON_BN_CLICKED(ID_CHANGE, OnChange) G IT>L  
//}}AFX_MSG_MAP Y&d00  
END_MESSAGE_MAP() WJkZ!O$"j  
4W#vP  
BOOL CCaptureDlg::OnInitDialog() $RIecv<e_  
{ t\{'F7  
 CDialog::OnInitDialog(); &]v4@%<J  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vY${;#~|  
 ASSERT(IDM_ABOUTBOX < 0xF000); R`DKu=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Nn~~!q  
 if (pSysMenu != NULL) ||hb~%JK6  
 { )4gJd? 8R  
  CString strAboutMenu; si`A:14R  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ?'@8kpb  
  if (!strAboutMenu.IsEmpty()) {|&5_][  
  { zF8dKFE~  
   pSysMenu->AppendMenu(MF_SEPARATOR); :Q $K<)[  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 9F)z4  
  } J'SZ  
 } u09:Z{tL;@  
 SetIcon(m_hIcon, TRUE); // Set big icon F+ ,~v-  
 SetIcon(m_hIcon, FALSE); // Set small icon '_w=k 4  
 m_Key.SetCurSel(0); b[t>te  
 RegisterHotkey(); r@+ri1c  
 CMenu* pMenu=GetSystemMenu(FALSE); OWjk=u2Lz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); p?7v$ev_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ftvG\Tf  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~sl{|E  
 return TRUE; // return TRUE unless you set the focus to a control =vDEfO/T  
} Rs-]N1V  
 86 W9rR  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 6:Ch^c+IZ  
{ XQ9O$ ~q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )}D'<^=#T  
 { _aFl_\3>  
  CAboutDlg dlgAbout; R?~Yp?B^  
  dlgAbout.DoModal();  -xSA  
 } ~]pE'\D7Ad  
 else TcjEcMw,  
 { <>s`\ %  
  CDialog::OnSysCommand(nID, lParam); s2'yY(u/  
 } q>$ev)W  
} DnCP aM4%  
-8:&>~4`  
void CCaptureDlg::OnPaint() Ghx3EVqnx"  
{ E^ P,*s  
 if (IsIconic()) q|o}+Vr  
 { DoJ\ q+  
  CPaintDC dc(this); // device context for painting J&[@}$N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 01r 8$+  
  // Center icon in client rectangle 8$85^Of  
  int cxIcon = GetSystemMetrics(SM_CXICON); T (OW  
  int cyIcon = GetSystemMetrics(SM_CYICON); v, n$^R  
  CRect rect; 'Jt]7;04p  
  GetClientRect(&rect); ^?cz,N~  
  int x = (rect.Width() - cxIcon + 1) / 2; ;1`fC@rI  
  int y = (rect.Height() - cyIcon + 1) / 2; sYe?M,  
  // Draw the icon R< ,`[*Z  
  dc.DrawIcon(x, y, m_hIcon); -8eoNzut  
 } -=)+dCyB^  
 else E*.{=W }C  
 { pm*xb]8y  
  CDialog::OnPaint(); #MX'^RZ>2  
 } =|M>l  
} ,Sq/y~  
ohFJZ'  
HCURSOR CCaptureDlg::OnQueryDragIcon() iF-6Y0~8  
{ u [m  
 return (HCURSOR) m_hIcon; ,uo'c_f(e  
} ?EJD?,}  
pP*zq"o  
void CCaptureDlg::OnCancel() C\/xl#e<@  
{ co~Pyj  
 if(bTray) f!oT65Vmi  
  DeleteIcon(); %+8F'&X  
  CDialog::OnCancel(); P_?gq>E8  
} ';TT4$(m  
b8V~S'6VqO  
void CCaptureDlg::OnAbout() tZ} v%3  
{ 0Sle  
 CAboutDlg dlg; /2UH=Q!x4E  
 dlg.DoModal(); *AoR==:ya  
} Y? x,  
xIxn"^'  
void CCaptureDlg::OnBrowse() P|.]DJ  
{ ]w;rfn9D  
 CString str; -~v|Rt  
 BROWSEINFO bi; uJFdbBDSh  
 char name[MAX_PATH]; fBRo_CU8!  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4]h =yc R  
 bi.hwndOwner=GetSafeHwnd(); $ et0s;GBv  
 bi.pszDisplayName=name; J)`-+}7$v  
 bi.lpszTitle="Select folder"; zo+nq%=  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ~%^ tB  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); bu:S:`  
 if(idl==NULL) ln?v j)j  
  return; ;'5>q&[qbP  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (d(hR0HKE  
 str.ReleaseBuffer(); AvdXEY(-  
 m_Path=str; PJ]];MQ  
 if(str.GetAt(str.GetLength()-1)!='\\') ZAv,*5&<  
  m_Path+="\\"; 3&u&x(   
 UpdateData(FALSE); \@8+U;d  
} z.GMqW%B  
K8>zF/# +  
void CCaptureDlg::SaveBmp() u+'tfFds&  
{ IPgt|if^  
 CDC dc; .QA }u ,EN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); tNGp\~  
 CBitmap bm; |?qquD 4=  
 int Width=GetSystemMetrics(SM_CXSCREEN); 62O.?Ij  
 int Height=GetSystemMetrics(SM_CYSCREEN); 7B!x T2{T  
 bm.CreateCompatibleBitmap(&dc,Width,Height); k"NVV$;  
 CDC tdc; DE%KW:Hug  
 tdc.CreateCompatibleDC(&dc); ~-EOjX(X'E  
 CBitmap*pOld=tdc.SelectObject(&bm); K[ (NTp$E  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <F}_ /q1  
 tdc.SelectObject(pOld); 5Yl <h)1  
 BITMAP btm; RoU55mL  
 bm.GetBitmap(&btm); #9X70|f  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^C_#<m_k  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ppZDGpp  
 BITMAPINFOHEADER bih; H *[_cqnv  
 bih.biBitCount=btm.bmBitsPixel; i'9vL:3  
 bih.biClrImportant=0; Pa~)"u 8  
 bih.biClrUsed=0; k Mu8"Az  
 bih.biCompression=0; ^r*r w=  
 bih.biHeight=btm.bmHeight; +)y^ 'Qs  
 bih.biPlanes=1; { jhr<  
 bih.biSize=sizeof(BITMAPINFOHEADER); VY~yg*  
 bih.biSizeImage=size; +6';1Nb@  
 bih.biWidth=btm.bmWidth; U@-^C"R  
 bih.biXPelsPerMeter=0; GH+r ?2<  
 bih.biYPelsPerMeter=0; e6d<dXx  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); q OSM}ei>s  
 static int filecount=0; QV {}K  
 CString name; w *oeK  
 name.Format("pict%04d.bmp",filecount++); 4<% *E{`  
 name=m_Path+name; nq6@6GRG  
 BITMAPFILEHEADER bfh; >N]7IU[-  
 bfh.bfReserved1=bfh.bfReserved2=0; yp$_/p O=2  
 bfh.bfType=((WORD)('M'<< 8)|'B'); xn5l0'2  
 bfh.bfSize=54+size; /Y'Vh^9/T  
 bfh.bfOffBits=54; AQ_|:  
 CFile bf; 73xAG1D$r  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ +tVaBhd!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); So0f)`A  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); kdl:Wt*4o  
  bf.WriteHuge(lpData,size); SzjkI+-$:  
  bf.Close(); p4'G$]#  
  nCount++; %@.v2 cT  
 } my}-s  
 GlobalFreePtr(lpData); :P<]+\m  
 if(nCount==1) KU8J bl*   
  m_Number.Format("%d picture captured.",nCount); E=>FjCsu<-  
 else f6p-s y>  
  m_Number.Format("%d pictures captured.",nCount); &Rvm>TC=  
  UpdateData(FALSE); 1XD,uoxB  
} a{R%#e\n  
j!]YNH@  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) fZ*+2T>  
{ vJ'2@f$  
 if(pMsg -> message == WM_KEYDOWN)  CCL   
 { QKr,g  
  if(pMsg -> wParam == VK_ESCAPE) ^~3SSLS4"  
   return TRUE; r]b_@hT',  
  if(pMsg -> wParam == VK_RETURN) ~S8*t~  
   return TRUE; CE/Xfh'44  
 } mT.u0KUIy  
 return CDialog::PreTranslateMessage(pMsg); [/e<l&y  
} 1IZ3=6  
MBqt&_?K  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) JwAYG5W  
{ d4?Mi2/jF  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 22.8PO0  
  SaveBmp(); Bs O+NP  
  return FALSE; wM2*#  
} FLGk?.x$\  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ fpFhn  
 CMenu pop; R )mu2 ^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); [uI|DUlI6o  
 CMenu*pMenu=pop.GetSubMenu(0); Bh;7C@dq  
 pMenu->SetDefaultItem(ID_EXITICON); 8C67{^`::  
 CPoint pt; 9Hf9VC3   
 GetCursorPos(&pt); v"#mzd.tW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %k'!Iq+  
 if(id==ID_EXITICON) c.>oe*+  
  DeleteIcon(); :TJv=T'p'  
 else if(id==ID_EXIT) 0cJWJOj&  
  OnCancel(); yuat" Pg  
 return FALSE; R}q>O5O  
} .=X}cJ]`[  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); uf&myV7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) [%77bv85.G  
 AddIcon(); x "^Xj]-  
 return res; PfC!lI BU  
} %F-ZN^R  
0tEYU:Qu  
void CCaptureDlg::AddIcon() T>R0T{A  
{ yIDD@j=l  
 NOTIFYICONDATA data; f;1K5Y  
 data.cbSize=sizeof(NOTIFYICONDATA); *#tJM.Z  
 CString tip; Y#u}tE d  
 tip.LoadString(IDS_ICONTIP); aVK3?y2  
 data.hIcon=GetIcon(0); D"ND+*Q [X  
 data.hWnd=GetSafeHwnd(); b\-&sM(W"  
 strcpy(data.szTip,tip); f] J M /  
 data.uCallbackMessage=IDM_SHELL; K }Vv4x1U  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; XqW@rU  
 data.uID=98; l}] t~!X=  
 Shell_NotifyIcon(NIM_ADD,&data); DGAX3N;r6{  
 ShowWindow(SW_HIDE); c6X}2a'  
 bTray=TRUE; l zYnw)Pv  
} n&-qaoNl  
3b+d"`Y^S  
void CCaptureDlg::DeleteIcon() 9Hc$G{[a  
{ $!8-? ?ML  
 NOTIFYICONDATA data; ,!7 H]4Qx  
 data.cbSize=sizeof(NOTIFYICONDATA); `"&d a#N]  
 data.hWnd=GetSafeHwnd(); h $L/<3oP6  
 data.uID=98; ;uw Ryd  
 Shell_NotifyIcon(NIM_DELETE,&data); ]cGA~d  
 ShowWindow(SW_SHOW); A7%:05  
 SetForegroundWindow(); t4-pM1]1_  
 ShowWindow(SW_SHOWNORMAL); XVv K2(  
 bTray=FALSE; k;w- E  
} .)<(Oj|4  
rz@=pR :  
void CCaptureDlg::OnChange() -lhLA`6_R  
{ WC.t_"@  
 RegisterHotkey(); kX>f^U{j  
} Y0_),OaY  
)FpZPdN+h  
BOOL CCaptureDlg::RegisterHotkey() <-,gAk)u  
{ V??dYB(  
 UpdateData(); u"d~!j1  
 UCHAR mask=0; 89wU-Aggq  
 UCHAR key=0; oE(7v7iY  
 if(m_bControl) }MHCd)78b  
  mask|=4; mw='dFt  
 if(m_bAlt) \>7^f 3m  
  mask|=2; O }(VlR2  
 if(m_bShift) ^V#@QPK9  
  mask|=1; lsy?Ac  
  key=Key_Table[m_Key.GetCurSel()]; GQ9\'z#+  
 if(bRegistered){ 7D!u1?]d{  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ^sVX)%  
  bRegistered=FALSE; 76Vl6cPu>  
 } Er+nk`UR_  
 cMask=mask; ,ztI,1"k  
 cKey=key; ?ON-+u  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); !-,t'GF(  
 return bRegistered; Fv Jd8kV  
} Vv8jEZ8  
V( -mD  
  四、小结 *{y K 8  
{6~l$  
  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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