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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: SaNx;xgi  
  ^ZsME,  
  一、实现方法 CNwhH)*  
REJ}T:  
  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: 3+Q6<MS q  
~ M"[FYw[  
#pragma data_seg("shareddata") NO&OuiN  
HHOOK hHook =NULL; //钩子句柄 # ;9KDt@  
UINT nHookCount =0; //挂接的程序数目 OygYP  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Og["X0j  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,Ubnz  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Djzb#M'm  
static int KeyCount =0; i|<*EXB"  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 i-Z@6\/a5  
#pragma data_seg() UY==1\  
q*T+8 O  
  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。 PU8R 0r2k\  
i55']7+0  
  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: au8) G_A  
oxRu:+N  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR U;^{uQJ+,  
cKey,UCHAR cMask) H=dj\Br`  
{ O&)Y3O1  
 BOOL bAdded=FALSE; {3;4=R3  
 for(int index=0;index<MAX_KEY;index++){  2}`OjVS  
  if(hCallWnd[index]==0){ R_^:<F0  
   hCallWnd[index]=hWnd; XdB8Oj~~  
   HotKey[index]=cKey; wiutUb Y  
   HotKeyMask[index]=cMask; fhC=MJ @  
   bAdded=TRUE; (<f[$ |%  
   KeyCount++; 0I.7I#'3O  
   break; `a J[ !O  
  } !,\]> c  
 } i^n&K:6  
 return bAdded; }/=VnCfU  
} {30A1>0#P  
//删除热键 /5o~$S  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^PD a  
{ |OC6yN *P)  
 BOOL bRemoved=FALSE; # OJD<=")  
 for(int index=0;index<MAX_KEY;index++){ =.uE(L`]NA  
  if(hCallWnd[index]==hWnd){ 55#H A?cR  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Fv3fad@x  
    hCallWnd[index]=NULL; Di&tm1R1  
    HotKey[index]=0; |ey6Czm  
    HotKeyMask[index]=0; j3FDGDrg  
    bRemoved=TRUE; SDot0`s>  
    KeyCount--; # wG}T .*  
    break; p1Els /|  
   } fQv^=DI#  
  } [1E u6X6  
 } /JvNJ f  
 return bRemoved; O|8p #  
} @)1u  
iR_X,&p   
N~a?0x  
  DLL中的钩子函数如下: P'g$F<~V  
#vIF]Y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) m:'fk;khN  
{ Jo2:0<VL  
 BOOL bProcessed=FALSE; TEY%OI zU+  
 if(HC_ACTION==nCode) [Y5B$7|s<  
 { c(@)V.o2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 |n~- LH++  
   switch(wParam) chxO*G  
   {  (pAGS{{  
    case VK_MENU: {| Tl3  
     MaskBits&=~ALTBIT; D].1X0^hp  
     break; Ix}:!L  
    case VK_CONTROL: JD,/oL.KA  
     MaskBits&=~CTRLBIT; S25&UwUw  
     break; >R :Bkf-  
    case VK_SHIFT: Uc6P@O*,  
     MaskBits&=~SHIFTBIT; TJ+yBMd*%  
     break; Lg-Sxz}P!  
    default: //judge the key and send message G !wFG-Y}  
     break; p6|0JBm  
   } D;m>9{=  
   for(int index=0;index<MAX_KEY;index++){ zU]95I  
    if(hCallWnd[index]==NULL) 3^C  
     continue; f~t*8rG~m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^xFZ;Yf  
    { O9jqeF`L=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8M !If  
     bProcessed=TRUE; iFpJ /L  
    } G 9d@vu  
   } HPT$)NeNc  
  } `Fnt#F}  
  else if((lParam&0xc000ffff)==1){ //有键按下 [$f  
   switch(wParam) fm Fh.m.+N  
   { RP!X 5  
    case VK_MENU: p"3_u;cN  
     MaskBits|=ALTBIT; e0qU2  
     break; d/N&bTg:  
    case VK_CONTROL: QF Vy2 q  
     MaskBits|=CTRLBIT; $fL2w^ @  
     break; .r$d 8J  
    case VK_SHIFT: i#=s_v8  
     MaskBits|=SHIFTBIT; Yq}(O<ol  
     break; "1yXOy^2  
    default: //judge the key and send message Y2HF  
     break; }GRZCX>  
   } kg1z"EE  
   for(int index=0;index<MAX_KEY;index++){ +<7`Gn(n3  
    if(hCallWnd[index]==NULL) : OQx;>'  
     continue; CWHTDao  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CM|?;PBuv  
    { |aIY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @WEDXB  
     bProcessed=TRUE; ncjtv"2R  
    } =*_T;;E  
   } |Q[[WHqj2f  
  } j&(aoGl@  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 4'_PLOgnX  
   for(int index=0;index<MAX_KEY;index++){ ~QQi{92  
    if(hCallWnd[index]==NULL) /J9|.];%r  
     continue; o)GLh^g_I'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `2.[8%6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); XmJu{RbS  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 \("|X>00  
   } ezS@LFaA  
  } $t}t'uJ  
 } YEqZ((H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Xt& rYv  
} j]~;|V5Z  
sba+J:#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: L"e8S%UqX  
Te_%r9P|2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^~XsHmcQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C3>&O?7J*7  
P+K< /i  
  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: Ti:PKpc  
U|Z Yoc+](  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]6#bp,  
{ ]jQj/`v1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) }04 EM  
 { 1g<jr.  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 R+}7]tva6C  
  SaveBmp(); :rR)rj'  
  return FALSE; X2\1OWR0  
 } ,sF49C D  
 …… //其它处理及默认处理 WOkAma-  
} =cz^g^7  
jjLx60|{  
{^(h*zxn  
  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;D 5)eJ90  
K;)(fc  
  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。 ePLpGT  
J;8M. _  
  二、编程步骤 ; D'6sd"  
$DS|jnpV  
  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"; }3HN $Fwo  
b5!D('w>]  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 8U86-'Pq  
!:BmDX[<n  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; :yFUlO:  
L"[2[p  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; x#)CH}J  
/hF@Xh%hY  
  5、 添加代码,编译运行程序。 ykMdH:  
I) ]"`2w2w  
三、程序代码 h$`zuz  
}o,-@R~  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1|bg;X9+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) sH_B*cr3  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ HAKB@h)  
#if _MSC_VER > 1000 ^GL>xlZ(  
#pragma once Ar{7H)V:  
#endif // _MSC_VER > 1000 @{V bu  
#ifndef __AFXWIN_H__ ~S\y)l\wZ  
#error include 'stdafx.h' before including this file for PCH X5_T?  
#endif % H/V iC  
#include "resource.h" // main symbols X\Gbs=sf6  
class CHookApp : public CWinApp CNMcQP  
{ ka=EOiX.  
 public: z*,J0)<Q  
  CHookApp(); 3%~c\naD?O  
  // Overrides cZR9rnZT  
  // ClassWizard generated virtual function overrides ' Bx"i  
  //{{AFX_VIRTUAL(CHookApp) y?Cq{(  
 public: 15J t @{<r  
  virtual BOOL InitInstance(); AJYZ`  
  virtual int ExitInstance(); 5.M82rR; ~  
  //}}AFX_VIRTUAL Gg TrIF  
  //{{AFX_MSG(CHookApp) M4}b l h#  
  // NOTE - the ClassWizard will add and remove member functions here. u; G-46  
  // DO NOT EDIT what you see in these blocks of generated code ! 3sD/4 ?  
  //}}AFX_MSG pOq9J7BS  
  DECLARE_MESSAGE_MAP() XP%/*am  
}; }kZ)|/]kn  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);  Q'~3Ik  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a1dkB"Zp.p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \p.eY)>  
BOOL InitHotkey(); {ovW6#  
BOOL UnInit(); N!lQ;o'  
#endif qw<~v?{|C  
B>r>z5  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. CbW>yr  
#include "stdafx.h" 1c4@qQyo  
#include "hook.h" FE'F@aS\  
#include <windowsx.h> 8[rZRc  
#ifdef _DEBUG 2A&Y})D  
#define new DEBUG_NEW +yd{-iH  
#undef THIS_FILE zBjbH=  
static char THIS_FILE[] = __FILE__; jJqq:.XqB8  
#endif >(He,o@M  
#define MAX_KEY 100 fx=HKt  
#define CTRLBIT 0x04 + 'V ,z  
#define ALTBIT 0x02 _z6" C8W  
#define SHIFTBIT 0x01 irooFR[L9  
#pragma data_seg("shareddata") E}lNb  
HHOOK hHook =NULL; #-7w |  
UINT nHookCount =0; }AG dWt@  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey (@i2a  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT K<E|29t^k  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |2!cPf^8  
static int KeyCount =0; .azA1@V|  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift !n3J6%b9y/  
#pragma data_seg() !SAR/sdXf  
HINSTANCE hins; gJYX  
void VerifyWindow(); (W'3Zv'f  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) k)TNmpL%"  
//{{AFX_MSG_MAP(CHookApp) |5g1D^b]s^  
// NOTE - the ClassWizard will add and remove mapping macros here. d>hLnz1O  
// DO NOT EDIT what you see in these blocks of generated code! 9jf2b  
//}}AFX_MSG_MAP OM (D@up  
END_MESSAGE_MAP() 3:MAdh[w  
'Ivr =-  
CHookApp::CHookApp() 3-4CGSX;X  
{ ' }T6dS  
 // TODO: add construction code here,  aX}:O  
 // Place all significant initialization in InitInstance @QbTO'UzK`  
} v%8S:3  
u&Cu"-%=M  
CHookApp theApp; ->*'Y;t4  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) NsF8`r g  
{ [DSD[[ z[  
 BOOL bProcessed=FALSE; ?bw1zYP  
 if(HC_ACTION==nCode) b |JM4jgK  
 { E-i <^&E  
  if((lParam&0xc0000000)==0xc0000000){// Key up /2Qgg`^)  
   switch(wParam) xC YL3hl  
   { "zx4k8  
    case VK_MENU: Rd:wMy$  
     MaskBits&=~ALTBIT; %y[ t+)!E  
     break; v~KgCLo  
    case VK_CONTROL: Q}|QgN  
     MaskBits&=~CTRLBIT; fBZR  
     break; hx:"'m5  
    case VK_SHIFT: ;Y%.m3  
     MaskBits&=~SHIFTBIT; BkJNu_{m?  
     break; V)3S.*]  
    default: //judge the key and send message 'w`3( ':=  
     break; vJfj1 f  
   } m$H(l4wB>  
   for(int index=0;index<MAX_KEY;index++){ p^X \~Yibs  
    if(hCallWnd[index]==NULL) >Ni<itze$i  
     continue; :M9 E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8j jq)d4#  
    { BiI`oCX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7yFV.#K3O  
     bProcessed=TRUE; u 4$$0 `  
    } hM~zO1XW  
   } X~> 2iL  
  } =plU3D2  
  else if((lParam&0xc000ffff)==1){ //Key down I1fUV72  
   switch(wParam) =N<Z@'c  
   { uBA84r%{QQ  
    case VK_MENU: :uQ~?amM  
     MaskBits|=ALTBIT; D.Z4noMA6  
     break; , Vr'F  
    case VK_CONTROL: zMbz_22*  
     MaskBits|=CTRLBIT; 65AG# O5R  
     break; HWxwG'EEY,  
    case VK_SHIFT: +X4/l"|  
     MaskBits|=SHIFTBIT; rFU|oDF  
     break; B,avI&7M;S  
    default: //judge the key and send message xZ(f_Oy  
     break; +lED6 ]+%  
   } :}3;z'2]l  
   for(int index=0;index<MAX_KEY;index++) IHStN,QD  
   { qb?9i-(  
    if(hCallWnd[index]==NULL) \%$z!]S>  
     continue; 3%DDN\q\u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  KSB{Z TE  
    { } 0x'm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ht5eb"c+ 8  
     bProcessed=TRUE; k+`e0Jago  
    } 5$Da\?Fpn  
   } V>:ubl8j0l  
  } (vb8Mk  
  if(!bProcessed){ 0pl |  
   for(int index=0;index<MAX_KEY;index++){ 4.qW ~ W{  
    if(hCallWnd[index]==NULL) ?h7(,39^>  
     continue; ~|.vz!A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :y8wv|m  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #azD& 6`  
   } ' Y cVFi  
  } -1<*mbb0  
 } 6%t>T~x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C">w3#M%  
} GEQ3r'B|  
PA<<{\dp  
BOOL InitHotkey() iR6w)  
{  g1B[RSWv  
 if(hHook!=NULL){ ! C|VX,w  
  nHookCount++; a^QyYX}\qR  
  return TRUE; w;4FN'  
 } 8oVQ:' 6  
 else _5JwJcQ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); z-;2)RkV2  
  if(hHook!=NULL) 4Y:[YlfD.  
   nHookCount++; N;.}g*_+}  
  return (hHook!=NULL); d/!R;,^  
} /R!/)sg  
BOOL UnInit() OjRJyhzS*  
{ LJ+Qe%|  
 if(nHookCount>1){ wU1h(D2&h  
  nHookCount--; 3r]N\c  
  return TRUE; NvU~?WN  
 } DU=rsePWE  
 BOOL unhooked = UnhookWindowsHookEx(hHook); C)8>_PY[M  
 if(unhooked==TRUE){ M^3pJ=;5  
  nHookCount=0; YNV4'  
  hHook=NULL; 5^7q 2".  
 } L6E8A?>5rD  
 return unhooked; Vi o ~2  
} q#!]5  
 Re^~8q[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) afNqK~  
{ '&n4W7  
 BOOL bAdded=FALSE; hA!kkNqV  
 for(int index=0;index<MAX_KEY;index++){ Z[pMlg6Z  
  if(hCallWnd[index]==0){ ]F81N(@:F  
   hCallWnd[index]=hWnd; M9scZuj  
   HotKey[index]=cKey; %}0B7_6B+@  
   HotKeyMask[index]=cMask; 4A@77#:J5  
   bAdded=TRUE; = gbB)u-Pc  
   KeyCount++; D`C#O 7.N  
   break; z-X_O32  
  } b w2KD7  
 } d9kN @W  
 return bAdded; ^qP}/H[QT  
} \WN ,.  
T_=iJ: Q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "0edk"hk  
{ ;LjTsF'  
 BOOL bRemoved=FALSE; V.U9Q{y"  
 for(int index=0;index<MAX_KEY;index++){ fu]mxGPc  
  if(hCallWnd[index]==hWnd){ QqU>V0y"w(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #y:,owo3I  
    hCallWnd[index]=NULL; W$bQS!7y  
    HotKey[index]=0; @;K-@*k3  
    HotKeyMask[index]=0; }aC@ov]2  
    bRemoved=TRUE; ]1k"'XG4,  
    KeyCount--; isiehKkD  
    break; xG|T_|?  
   } $VRVM Y [q  
  } p,'Z{7HG  
 } W-UMX',0zS  
 return bRemoved; ~R!M.gY[rK  
} |1[3RnG S  
swGp{wJ  
void VerifyWindow() eK)R=M@i  
{ #lld*I"d  
 for(int i=0;i<MAX_KEY;i++){ Tb@r@j:V  
  if(hCallWnd!=NULL){   iE8  
   if(!IsWindow(hCallWnd)){ <g4[p^A  
    hCallWnd=NULL; yy*8Aw}  
    HotKey=0; jqeR{yo&0b  
    HotKeyMask=0; 7u|X . X  
    KeyCount--; vdt":  
   } 4,)EG1  
  } ?n0Z4 8%  
 } k(bDj[0q^  
} T1YCld  
, A@uSfC(  
BOOL CHookApp::InitInstance() XHER[8l  
{ k/;%{@G)  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); yJRqX]MLA  
 hins=AfxGetInstanceHandle(); 6";ew:Ih^  
 InitHotkey(); 8uq`^l%KkZ  
 return CWinApp::InitInstance(); :kb2v1{\  
} qjrl$[`X:  
uZ/XI {/  
int CHookApp::ExitInstance() Q 2mTu[tx  
{ 4J9VdEKk  
 VerifyWindow(); Am @o}EC  
 UnInit(); G3wkqd  
 return CWinApp::ExitInstance(); I)YUGA5  
} R|u2ga ~  
WNmG'hlA  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file nd4Z5=X  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) BGOajYD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 5HqvSfq>?  
#if _MSC_VER > 1000 M8{J  
#pragma once :Q-QY)hH  
#endif // _MSC_VER > 1000 +~[>Usf  
mQka?_if)  
class CCaptureDlg : public CDialog `$oy4lDKQ  
{ mNk@WY_F  
 // Construction V=cJdF  
 public: C4H$w:bVk  
  BOOL bTray; N7 ox#=g  
  BOOL bRegistered; V<&^zIJUR  
  BOOL RegisterHotkey(); ~cL)0/j}  
  UCHAR cKey; 089 <B& <  
  UCHAR cMask; Hq;*T3E  
  void DeleteIcon(); >.o<}!FW  
  void AddIcon(); iz-B)^8.  
  UINT nCount; Mc@_[q!xY?  
  void SaveBmp(); \WPy9kRU  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 4Wk`P]?^  
  // Dialog Data a9N$I@bi]  
  //{{AFX_DATA(CCaptureDlg) =!N,{V_  
  enum { IDD = IDD_CAPTURE_DIALOG }; lK%)a +2  
  CComboBox m_Key; F(DM$5z[  
  BOOL m_bControl; 8c3/n   
  BOOL m_bAlt; f>zd,|)At  
  BOOL m_bShift; F"| ;  
  CString m_Path; dIq*"Ry+~  
  CString m_Number; m8Y>4:Nw  
  //}}AFX_DATA \f-@L;8#  
  // ClassWizard generated virtual function overrides Min {&?a  
  //{{AFX_VIRTUAL(CCaptureDlg) qp{3I("_  
 public: U)6Ew4uRxV  
  virtual BOOL PreTranslateMessage(MSG* pMsg); nJ2910"<  
 protected: 6c[Slq!KA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U_C[9Z'P  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 3S=$ng  
  //}}AFX_VIRTUAL vtw97G  
  // Implementation CsX@u#  
 protected: E|"QYsi.Ck  
  HICON m_hIcon; -,qGEJ  
  // Generated message map functions FG5YZrONx  
  //{{AFX_MSG(CCaptureDlg) A)80qx:  
  virtual BOOL OnInitDialog(); 6ee1^>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); %zYTTPLZ  
  afx_msg void OnPaint(); SNrX(V::z  
  afx_msg HCURSOR OnQueryDragIcon(); kk$D:UQX  
  virtual void OnCancel(); ?Ll1B3f  
  afx_msg void OnAbout(); U]PsL3:  
  afx_msg void OnBrowse(); orZwm9#].  
  afx_msg void OnChange(); ?`3G5at)9f  
 //}}AFX_MSG Mt*eC)~ Yx  
 DECLARE_MESSAGE_MAP() #Fckev4  
}; =6d'/D#J  
#endif ,?c=v`e  
MZ%S3'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [!j;jlh7},  
#include "stdafx.h" Sd *7jW?  
#include "Capture.h" 4bq+(CI6  
#include "CaptureDlg.h" xzb{g,c   
#include <windowsx.h> |[iEi  
#pragma comment(lib,"hook.lib") jL*s(Yq  
#ifdef _DEBUG ekCt1^5Y  
#define new DEBUG_NEW h3(B7n7  
#undef THIS_FILE bW2Msv/H  
static char THIS_FILE[] = __FILE__; Mi<}q@]e  
#endif )(h<vo)-zX  
#define IDM_SHELL WM_USER+1 50^CILKo7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); B*^8kc:)L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >a)6GZ@  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; !|-:"hE1h  
class CAboutDlg : public CDialog 'e*:eBoyb  
{ :MILOwF  
 public: ]htx9ds=  
  CAboutDlg(); ^:2>I$  
  // Dialog Data B&sa|'0U  
  //{{AFX_DATA(CAboutDlg) R_duPaWc@  
  enum { IDD = IDD_ABOUTBOX }; ?MD\\gN  
  //}}AFX_DATA A&C?|M? M  
  // ClassWizard generated virtual function overrides rW[7 _4  
  //{{AFX_VIRTUAL(CAboutDlg) ]//D d/L6  
 protected: keS%w]87  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support t]6 4=  
  //}}AFX_VIRTUAL Q32GI,M%B  
  // Implementation QuBaG<  
 protected: IRbZ ;*3dO  
  //{{AFX_MSG(CAboutDlg) X({R+  
  //}}AFX_MSG }qN   
  DECLARE_MESSAGE_MAP() G\Q0{4w8  
}; 6D29s]h2  
EoOwu-{  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) f/pr  
{ | (: PX  
 //{{AFX_DATA_INIT(CAboutDlg) T;pe7"  
 //}}AFX_DATA_INIT +.|8W!h`1  
} X`0`A2 n  
{3G2-$yb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) cxxrvP-  
{ qViolmDz  
 CDialog::DoDataExchange(pDX); YA@OA$`E  
 //{{AFX_DATA_MAP(CAboutDlg) 4Dv42fO  
 //}}AFX_DATA_MAP YvPs   
} 29k\}m7l<*  
''wF%q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) NplkhgSj  
 //{{AFX_MSG_MAP(CAboutDlg) xmwH~UWp  
 // No message handlers q6zKyOE  
 //}}AFX_MSG_MAP ZJ}|t  
END_MESSAGE_MAP() |^t8ct?x~  
> 72qi*0  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Q*caX   
: CDialog(CCaptureDlg::IDD, pParent) r&D&xsbQ  
{ [ FNA:  
 //{{AFX_DATA_INIT(CCaptureDlg) X-J<gI(Y  
  m_bControl = FALSE; <m+$@:cO  
  m_bAlt = FALSE; ]`}R,'P  
  m_bShift = FALSE; ?iaD;:'qE  
  m_Path = _T("c:\\"); `KJ BQK  
  m_Number = _T("0 picture captured."); k?ksv+e\  
  nCount=0; \bumB<w(]  
  bRegistered=FALSE; aDE)Nf}  
  bTray=FALSE; Uv(Uj3D  
 //}}AFX_DATA_INIT 'E~[I"0  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 5Y(f7,JX  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); H8?Kgaj~vf  
} 2z[A&s_  
&HYs^|ydrr  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) AV^Sla7|_  
{ x)!NB99(tC  
 CDialog::DoDataExchange(pDX); 3NC-)S  
 //{{AFX_DATA_MAP(CCaptureDlg) kV3Zt@+  
  DDX_Control(pDX, IDC_KEY, m_Key); Dv[ 35[Yh  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); P]||Xbbp  
  DDX_Check(pDX, IDC_ALT, m_bAlt); nh+f,HtSt  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); mdPEF)-  
  DDX_Text(pDX, IDC_PATH, m_Path); [";<YR7iRN  
  DDX_Text(pDX, IDC_NUMBER, m_Number); u7kw/_f  
 //}}AFX_DATA_MAP 1U;p+k5c  
} i;8tA !  
Oj^qh+r  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) cQldBc  
//{{AFX_MSG_MAP(CCaptureDlg) Ee-yP[2 *  
 ON_WM_SYSCOMMAND() _T[m YY  
 ON_WM_PAINT() >6"u{Qmr  
 ON_WM_QUERYDRAGICON() $r87]y!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) f S(IN~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1VC:o]$  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -% Z?rn2  
//}}AFX_MSG_MAP 2q ,> *B?  
END_MESSAGE_MAP() $E]W U?U  
V+2C!)f(  
BOOL CCaptureDlg::OnInitDialog() 5rx;?yvn  
{ CN, oH4IU  
 CDialog::OnInitDialog(); )I`Ma6bX  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); O6$d@r;EK]  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7;;HP`vY  
 CMenu* pSysMenu = GetSystemMenu(FALSE); p!xCNZ(m  
 if (pSysMenu != NULL) \,5OPSB  
 { { |[n>k   
  CString strAboutMenu; o7;#B)jWS  
  strAboutMenu.LoadString(IDS_ABOUTBOX); CDTM<0`%  
  if (!strAboutMenu.IsEmpty()) 2RC|u?+@  
  { ~i y]X:U  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?#0|A?U  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); xf]_@T;  
  } ;}k9YlQrN  
 } *eonXJYD  
 SetIcon(m_hIcon, TRUE); // Set big icon Juqe%he`  
 SetIcon(m_hIcon, FALSE); // Set small icon yq2pg8%  
 m_Key.SetCurSel(0); \tx4bV#  
 RegisterHotkey();  *c6o#[l  
 CMenu* pMenu=GetSystemMenu(FALSE); eAD uk!Iq  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ~'<ca<Go|  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); &?xZ Hr`  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); fNnemn@>  
 return TRUE; // return TRUE unless you set the focus to a control 7; e$ sr  
} U4*Q;A#  
^*=.Vuqy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) O>H'o k  
{ ^$I8ga  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) _rU%DL?  
 { X|w[:[P  
  CAboutDlg dlgAbout; mWPA]g(  
  dlgAbout.DoModal(); w( ^  
 } _`(WX;sK  
 else ;9rS[$^$O  
 { k6?;D_dm  
  CDialog::OnSysCommand(nID, lParam); ?|;q=p`t-  
 } 3</gK$f2  
} %!X|X,b^O  
@ysc?4% q  
void CCaptureDlg::OnPaint() qXw^y  
{ B<" `<oG@|  
 if (IsIconic()) *lT:P-  
 { 6*\WH%  
  CPaintDC dc(this); // device context for painting *VPj BzcH  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); y]e[fZ`L  
  // Center icon in client rectangle h vO  
  int cxIcon = GetSystemMetrics(SM_CXICON); (6Tvu5*4U  
  int cyIcon = GetSystemMetrics(SM_CYICON); EkvTl-  
  CRect rect; ,p\:Z3{ZH  
  GetClientRect(&rect); 0<";9qN)6  
  int x = (rect.Width() - cxIcon + 1) / 2; Z=&cBv4Fs  
  int y = (rect.Height() - cyIcon + 1) / 2; _vV3A3|Ec,  
  // Draw the icon XDdF7i}  
  dc.DrawIcon(x, y, m_hIcon); %HAforH  
 } Jb (CH4|7  
 else vk&6L%_~a  
 { 4,]z  
  CDialog::OnPaint(); -E(0}\  
 } KW1b #g%Z  
} f"}g5eg+  
~>"m`Q&[  
HCURSOR CCaptureDlg::OnQueryDragIcon() 'fIoN%  
{ `UK'IN.il  
 return (HCURSOR) m_hIcon; nde_%d$  
} dz>2/'  
0Kytg\p}  
void CCaptureDlg::OnCancel() '=X)0GG  
{ &{uj3s&C   
 if(bTray) ls*bCe  
  DeleteIcon(); 5mYX#//:  
  CDialog::OnCancel(); 1XpG7  
} 00-cT9C3  
N7 FndB5%  
void CCaptureDlg::OnAbout()  nLD1j  
{ w$##GM=Tq  
 CAboutDlg dlg; . \t8s0A  
 dlg.DoModal(); ("r\3Mvs  
} e"D%eFkDW  
)p^" J|  
void CCaptureDlg::OnBrowse() $&~moAl  
{ ~9[O'  
 CString str; m0Geq.  
 BROWSEINFO bi; je`Ysben  
 char name[MAX_PATH]; U5RLM_a@M  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); "\k| Z  
 bi.hwndOwner=GetSafeHwnd(); YLsOA`5X  
 bi.pszDisplayName=name; 90[6PSXk  
 bi.lpszTitle="Select folder"; b$;qtfJG  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8 v}B-cS  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .<Rw16O  
 if(idl==NULL) D>fg  
  return; ;0vCZaEF  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); B%^W$7 q  
 str.ReleaseBuffer(); S6CI+W  
 m_Path=str; e~U]yg5X-  
 if(str.GetAt(str.GetLength()-1)!='\\') Cvp!(<<gK  
  m_Path+="\\"; { )-8P  
 UpdateData(FALSE); ak A7))Q  
} ]?6Pt:N2  
"P9(k>  
void CCaptureDlg::SaveBmp() ?:42jp3  
{ W=:AOBK  
 CDC dc; `+m:@0&L  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); r@a]fTf  
 CBitmap bm; S54q?sb_  
 int Width=GetSystemMetrics(SM_CXSCREEN); S"4eS,5L|  
 int Height=GetSystemMetrics(SM_CYSCREEN); g7" 2}|qxo  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @9tzk [  
 CDC tdc; K0YQ b&*k  
 tdc.CreateCompatibleDC(&dc); $*Kr4vh  
 CBitmap*pOld=tdc.SelectObject(&bm); )Yu  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ZuFcJ?8i  
 tdc.SelectObject(pOld); l+a1`O  
 BITMAP btm; ?o6X_UxW!  
 bm.GetBitmap(&btm); @V&c=8) 8  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; V,h}l"  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); M u i\E  
 BITMAPINFOHEADER bih; 02_+{vk!  
 bih.biBitCount=btm.bmBitsPixel; Qhq' %LR  
 bih.biClrImportant=0; IIG9&F$G  
 bih.biClrUsed=0; n_4 r'w  
 bih.biCompression=0; 4_`(c1oA  
 bih.biHeight=btm.bmHeight; KdBpfPny@  
 bih.biPlanes=1; 6CCm1F{`  
 bih.biSize=sizeof(BITMAPINFOHEADER); 3=Q:{  
 bih.biSizeImage=size; 6_s(Kx>j  
 bih.biWidth=btm.bmWidth; 3K=%I+G(4  
 bih.biXPelsPerMeter=0; njc-=o  
 bih.biYPelsPerMeter=0; |h?2~D!+d  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Q5^ #:uZ  
 static int filecount=0; ", p5}}/  
 CString name; )ViBH\.*p  
 name.Format("pict%04d.bmp",filecount++); Mg~4) DW]  
 name=m_Path+name; EE^x34&=  
 BITMAPFILEHEADER bfh; _%[po%]  
 bfh.bfReserved1=bfh.bfReserved2=0; wRvh/{xB  
 bfh.bfType=((WORD)('M'<< 8)|'B'); :h(` eC  
 bfh.bfSize=54+size; pM^ZC  
 bfh.bfOffBits=54; q;}iW:r&Q  
 CFile bf; QC?~$>h!?  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ D4b-Y[/"  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <iA\ZS:  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 1ysQvz  
  bf.WriteHuge(lpData,size); WfD fj  
  bf.Close(); ZfH +Iqd  
  nCount++; 9Ta0Li  
 } R_O=WmD  
 GlobalFreePtr(lpData); S,j. ?u*!  
 if(nCount==1) oOLey!uZw  
  m_Number.Format("%d picture captured.",nCount); /O5&)%N  
 else -V4%f{9T3  
  m_Number.Format("%d pictures captured.",nCount); lYTQg~aPm  
  UpdateData(FALSE); .faf!3d  
} ~o>Gm>5!HH  
?=ffv]v|  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) RC/45:hZZ  
{ `% QvCAR  
 if(pMsg -> message == WM_KEYDOWN) lXg5UrW  
 { XC5/$3'M&  
  if(pMsg -> wParam == VK_ESCAPE) c"v75lW-J  
   return TRUE; Q6W![571;  
  if(pMsg -> wParam == VK_RETURN) !b"?l"C+u  
   return TRUE; pB4Uc<e  
 } >{N}UNZ$}  
 return CDialog::PreTranslateMessage(pMsg); W|D kq  
} b8e\(Dww  
V"Z8-u  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) A#6zI NK#B  
{ gfs;?vP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \XPGA uEo  
  SaveBmp(); <n4` #d  
  return FALSE; m`9nDiV  
} l2LLM{B  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ D8<C7  
 CMenu pop; qXg&E}]:=  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0:`|T jf_  
 CMenu*pMenu=pop.GetSubMenu(0); b,^Gj]7  
 pMenu->SetDefaultItem(ID_EXITICON); o]~\u{o#.  
 CPoint pt; y ?&hA! x  
 GetCursorPos(&pt); 00.x*v  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ~W[I  
 if(id==ID_EXITICON) {G Jl<G1  
  DeleteIcon(); {BmqUoZrC  
 else if(id==ID_EXIT)  v&|65[<  
  OnCancel(); y-db CYMc  
 return FALSE; yo=L1; H  
} t&xoi7!$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Lx wi"ndP  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) QJ3#~GYNr  
 AddIcon(); &yvvea]  
 return res; 2}A)5P*K  
} X>Vc4n<}  
iCPm7AU  
void CCaptureDlg::AddIcon() Xva(R<W7d<  
{ a$ "nNmD?  
 NOTIFYICONDATA data; V6X )L>!xx  
 data.cbSize=sizeof(NOTIFYICONDATA); _"ciHYHBQ  
 CString tip; TIKkS*$  
 tip.LoadString(IDS_ICONTIP); E=N$JM  
 data.hIcon=GetIcon(0); BYB4- ,  
 data.hWnd=GetSafeHwnd(); ZQ]qJDk  
 strcpy(data.szTip,tip); >!t3~q1Cn  
 data.uCallbackMessage=IDM_SHELL; &h0LWPl  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; GLn=*Dh#  
 data.uID=98; (T_-`N|  
 Shell_NotifyIcon(NIM_ADD,&data); >`\.i,X .D  
 ShowWindow(SW_HIDE); Jv8:GgSg  
 bTray=TRUE; x%l(0K  
} s`jlE|jtN  
F(yR\)!C  
void CCaptureDlg::DeleteIcon() &t[[4+Qt  
{ M bWby'  
 NOTIFYICONDATA data; x ;|HT  
 data.cbSize=sizeof(NOTIFYICONDATA); V 9Qt;]mQ  
 data.hWnd=GetSafeHwnd(); 8f9wUPr  
 data.uID=98; vN'+5*Cgy6  
 Shell_NotifyIcon(NIM_DELETE,&data); Jt=- >  
 ShowWindow(SW_SHOW); taE p   
 SetForegroundWindow(); . vb##D  
 ShowWindow(SW_SHOWNORMAL); uQIPnd(V  
 bTray=FALSE; {  c#US  
} f6%k;R.Wz  
 y:RW:D&  
void CCaptureDlg::OnChange() @."K"i'Bl  
{ ]SCHni_  
 RegisterHotkey(); }PBme'kP  
} `NN P<z+\  
)Ka-vX)D@  
BOOL CCaptureDlg::RegisterHotkey() 6G2~'zqPc~  
{ .; F<X \_  
 UpdateData(); SBreA-2  
 UCHAR mask=0; "V' r}>  
 UCHAR key=0; "E\vdhk  
 if(m_bControl) ga;nM#/  
  mask|=4; 9\4x<*  
 if(m_bAlt) 0vqVE]C  
  mask|=2; VcrMlcnO  
 if(m_bShift) ^2~ZOP$A  
  mask|=1; Sb[>R(0:  
  key=Key_Table[m_Key.GetCurSel()]; Ddr.6`VJ  
 if(bRegistered){ 9^XZ|`  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); )#m{"rk[x,  
  bRegistered=FALSE; },8|9z#pyB  
 } b*n3Fej  
 cMask=mask; wH ,PA:  
 cKey=key; <[k3x8H'  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); J@2jx4   
 return bRegistered; FBXktSg  
} 5-X$"Z|@  
<  o?ua}  
  四、小结 M{J>yN  
mD9Iao%4~  
  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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