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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: Sr-|,\/O  
  |zT%$  
  一、实现方法 ,v|CombIc.  
v)%[  
  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: CN-4-  
H kSL5@  
#pragma data_seg("shareddata") kRQ~hRT6  
HHOOK hHook =NULL; //钩子句柄 xa' nJ"f;  
UINT nHookCount =0; //挂接的程序数目 Euqjxz  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 m\1VF\  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~NA1SZ{Y+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _jiQL66pY  
static int KeyCount =0; 4Fh&V{`W  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 `3]Rg0g&Xe  
#pragma data_seg() dG" K/|  
$R8>u#K!  
  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。 <&KLo>B^  
/cM 5  
  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: ^zKt{a  
U2VV[e)Z!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR B<(Pd  
cKey,UCHAR cMask) omNpE_  
{ _w\Y{(k  
 BOOL bAdded=FALSE; q"P5,:W  
 for(int index=0;index<MAX_KEY;index++){ Q%+ }  
  if(hCallWnd[index]==0){ #aj|vox}  
   hCallWnd[index]=hWnd; Ii,~HH  
   HotKey[index]=cKey; q^)=F_QvG  
   HotKeyMask[index]=cMask; p1Y+  
   bAdded=TRUE; b{zAJ`|#[n  
   KeyCount++; -3u@hp_  
   break; ]Jja  
  } vU?b"n  
 } !T)T_P[  
 return bAdded; Ng?apaIi@~  
} |)m*EME  
//删除热键 #,7eQaica  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2O$95 M  
{ $+A%ODv  
 BOOL bRemoved=FALSE; 'y'T'2N3  
 for(int index=0;index<MAX_KEY;index++){ ,LoMt ]H  
  if(hCallWnd[index]==hWnd){ &b 5T&-C<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #Tup]czO  
    hCallWnd[index]=NULL; /A %om|+Gq  
    HotKey[index]=0; bELIRM9  
    HotKeyMask[index]=0; 71JM [2  
    bRemoved=TRUE; )3BR[*u*  
    KeyCount--; @TdQZZ}G\x  
    break; v<{wA`'R+  
   } A Z]P+v  
  } )>-77\  
 } N>Vacc_[  
 return bRemoved; P'-JbPXU  
} 9Q,Msl4n  
^fFtI?.6jI  
W`w5jk'0^=  
  DLL中的钩子函数如下: A4~D#V  
"PZYgl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pESB Il  
{ {E;2&d  
 BOOL bProcessed=FALSE; Pz5ebhgq  
 if(HC_ACTION==nCode) IOSuaLH^  
 { e} sc]MTM  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ox!|)^`$_  
   switch(wParam) JR H f.?  
   {  yjGGqz$  
    case VK_MENU: _8,vk-,'  
     MaskBits&=~ALTBIT; I{`KKui<M  
     break; N$N;Sw  
    case VK_CONTROL: 5%2ef{T[  
     MaskBits&=~CTRLBIT; -}=@ *See#  
     break; fR+Ov8PCq  
    case VK_SHIFT: 73'U#@g6  
     MaskBits&=~SHIFTBIT;  R4&|t  
     break; X{5v?4wI  
    default: //judge the key and send message 7 JxE |G  
     break; #[gcg]6c  
   } d9`3EP)n  
   for(int index=0;index<MAX_KEY;index++){ 1mT|o_K{ T  
    if(hCallWnd[index]==NULL) cmwzKu%  
     continue; ?2J S&i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3g?MEM~  
    { 9\AEyaJFZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);  1m&!l6Jk  
     bProcessed=TRUE; ^U-vD[O8  
    } C1ZFA![  
   } 7xLo 4  
  } zF[3%qZE:T  
  else if((lParam&0xc000ffff)==1){ //有键按下 4]Un=?)I  
   switch(wParam) Y{%4F%Oy  
   { )ZS:gD  
    case VK_MENU: Qh)|FQ[s$r  
     MaskBits|=ALTBIT; g`%ED0aR  
     break; Zp/qs z(]  
    case VK_CONTROL: ^2&O3s  
     MaskBits|=CTRLBIT; Uq9,(tV`6g  
     break; wQF&GGY R  
    case VK_SHIFT: "7To c4  
     MaskBits|=SHIFTBIT; ?)A]q' O  
     break; G=r(SJq  
    default: //judge the key and send message Gk{ "O%AE  
     break; wc<2Uc  
   } ]7#^])>  
   for(int index=0;index<MAX_KEY;index++){ LV}UBao5n  
    if(hCallWnd[index]==NULL) n4ds;N3Hd  
     continue; X";QA":  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^yn[QWFO  
    { 377j3dP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); \j,v/C@c-  
     bProcessed=TRUE; 0Zc*YdH  
    } v`z=OHc  
   } z4%Z6Y  
  } 1A|x$j6m  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 afxj[;p!  
   for(int index=0;index<MAX_KEY;index++){ zxk??0] /  
    if(hCallWnd[index]==NULL) %4|n-`:  
     continue; G/LXUhuif  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hO+O0=$}wN  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -(4E  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 MFc=B`/X  
   } !7O=<  
  } yS:IRI.  
 } FT|/ WZR  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 9,iq"dQ  
} eHF(,JI  
R` I8Ud4=  
  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: C }h<ldlY  
# `N6<nb  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q5?rp|7D  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); bWX[<rh'  
4%',scn  
  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: ~xlMHf  
Lyf? V(S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) hr~qt~Oi  
{ !T#8N7J>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /ygUd8@  
 { SU_] C+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [T}%q"<  
  SaveBmp(); giPhW>  
  return FALSE; D]G'R5H  
 } ?c=R"Yg$  
 …… //其它处理及默认处理 Pv{,aV\I}  
} Z?.p%*>`T=  
T>%uRK$  
0%A(dJA6  
  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。 Qq;m"M/  
wB1|r{  
  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。 U&Sbm~Qi  
^B&ahk  
  二、编程步骤 ^ RcIE (  
ery?G-  
  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"; ZZ]OR;8  
@MlU!oR&  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; UgnsV*e&  
/QV. U.>G  
  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; PtPGi^  
Dj,+t+|  
  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; &G7)s%q  
0bnVIG2q  
  5、 添加代码,编译运行程序。 C%95~\Ds  
zP{<0o  
三、程序代码 NU)`js  
UuOLv;v  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL gT5Ji~xI  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) JucxhjV#,  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ !q=Q~ea  
#if _MSC_VER > 1000 P$(iB.&  
#pragma once 764}yV>  
#endif // _MSC_VER > 1000  f>wW}-  
#ifndef __AFXWIN_H__ Il&"=LooZ  
#error include 'stdafx.h' before including this file for PCH 5uD#=/oV  
#endif jnU*l\,  
#include "resource.h" // main symbols jOm&yX  
class CHookApp : public CWinApp mP5d!+[8  
{ Ch \ed|u  
 public: {'c%#\  
  CHookApp(); aoakTi!}  
  // Overrides #8Id:56  
  // ClassWizard generated virtual function overrides z!1/_]WJ,  
  //{{AFX_VIRTUAL(CHookApp) E-tNB{r@  
 public: +Qi52OG  
  virtual BOOL InitInstance(); @8Q+=abz  
  virtual int ExitInstance(); . tH35/r  
  //}}AFX_VIRTUAL <R`,zE@t'(  
  //{{AFX_MSG(CHookApp) P/gb+V=g!  
  // NOTE - the ClassWizard will add and remove member functions here. y_7XYT!w  
  // DO NOT EDIT what you see in these blocks of generated code ! \\R*V'e!  
  //}}AFX_MSG 0oi5]f6g?8  
  DECLARE_MESSAGE_MAP() LO$#DHPt  
}; BJO~$/R?v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); _OknP2E  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z:B Y*#B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c&Su d, &  
BOOL InitHotkey(); D $CY:@  
BOOL UnInit(); YCB 3  
#endif wsb=[$C  
[y=$2  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. bKt3x+x(  
#include "stdafx.h" vVAZSR#  
#include "hook.h" xeP;"J}  
#include <windowsx.h> u>Axq3F  
#ifdef _DEBUG -B3w RAEt  
#define new DEBUG_NEW 9i2vWSga  
#undef THIS_FILE XvzV lKL  
static char THIS_FILE[] = __FILE__; ?/l}(t$H  
#endif iz  GaV[  
#define MAX_KEY 100 <rwOI.W l$  
#define CTRLBIT 0x04 ;5oH6{7_Z  
#define ALTBIT 0x02 dV2b)p4J  
#define SHIFTBIT 0x01 EhP&L?EL  
#pragma data_seg("shareddata") W-]yKSob  
HHOOK hHook =NULL; |E_+*1lq.  
UINT nHookCount =0; r/q1&*T  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T`'3Cp$q  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d$?n6|4  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ,f /IG.  
static int KeyCount =0; ?j4,^K3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ++{+ #s6  
#pragma data_seg() Kt* za  
HINSTANCE hins; / =Uv  
void VerifyWindow(); "$:y03V  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /?dQUu ^z  
//{{AFX_MSG_MAP(CHookApp) RY/ Z~]  
// NOTE - the ClassWizard will add and remove mapping macros here. A Fm*60C  
// DO NOT EDIT what you see in these blocks of generated code! BE2\?q-  
//}}AFX_MSG_MAP y1"^S  
END_MESSAGE_MAP() 0&rH 9  
VGDEP!)-8  
CHookApp::CHookApp() z5*O@_r+.b  
{ D16;6K'{  
 // TODO: add construction code here, f $@".  
 // Place all significant initialization in InitInstance \$HB~u%dr  
} !{~7)iq  
l& ^B   
CHookApp theApp; @n;YF5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 8JFkeU%yO  
{ ah6F^Kpl{  
 BOOL bProcessed=FALSE; %k;FxUKi  
 if(HC_ACTION==nCode) yY g&'3  
 { K[|P6J   
  if((lParam&0xc0000000)==0xc0000000){// Key up gmAKW4(  
   switch(wParam) z#E,96R  
   { NW>:Lz ?"  
    case VK_MENU: 08jUVHdt  
     MaskBits&=~ALTBIT; K{w=qJBM  
     break; k;:u| s8NS  
    case VK_CONTROL: 36Z`.E>~L  
     MaskBits&=~CTRLBIT; XOU-8;d  
     break; x#gmliF  
    case VK_SHIFT: AO7qs:+  
     MaskBits&=~SHIFTBIT; cSs/XJZ  
     break; 0!'M#'m  
    default: //judge the key and send message 7/OOq=z  
     break; 3]]6z K^i  
   } !RUo:b+  
   for(int index=0;index<MAX_KEY;index++){ &$z1Hz+l  
    if(hCallWnd[index]==NULL) a3 _0F@I  
     continue; g$T_yT''  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >93{=+  
    { qF6%XKbh=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); MLIQ 8=  
     bProcessed=TRUE; O>F.Wf5g  
    } I8%'Z>E(  
   } B)cb}.N:  
  } NizJq*V>  
  else if((lParam&0xc000ffff)==1){ //Key down 98}vbl31j  
   switch(wParam) 6=lQT 9u{  
   { fu "z%h]   
    case VK_MENU: ? A#z~;X@  
     MaskBits|=ALTBIT; :pjK\  
     break; eD1MP<>h  
    case VK_CONTROL:  p|8Fl  
     MaskBits|=CTRLBIT; rHdP4:n  
     break; WI 4_4  
    case VK_SHIFT: S"A_TH  
     MaskBits|=SHIFTBIT; C`_D{r  
     break; 5F+ f'~  
    default: //judge the key and send message !<PTsk F  
     break; Z6AU%3]  
   } L8K3&[l%  
   for(int index=0;index<MAX_KEY;index++) Cwa0!y5%  
   { R]s jG <  
    if(hCallWnd[index]==NULL) GQ)cUrXQz  
     continue; m)RxV@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b2f2WY |z>  
    { VM|)\?Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .MPOUo/e  
     bProcessed=TRUE; O xaua  
    } 4wD^?S!p  
   } EGr5xR-  
  } k+G4<qw  
  if(!bProcessed){ vlyNQ7"%  
   for(int index=0;index<MAX_KEY;index++){ CKt~#$ I%  
    if(hCallWnd[index]==NULL) h?tV>x/Fu  
     continue; VzM@DM]=~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vgZPDf|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ghQsS|)p.  
   } M6Z`Pwv];  
  } ^a5~FI:  
 } jtpNo~O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &'2l_b  
} 'u%;6'y  
P3FpU<OBwp  
BOOL InitHotkey() 2m}]z.w#  
{ &|FG#.2yw  
 if(hHook!=NULL){ yXl.Gq>]{  
  nHookCount++; s/^= WV  
  return TRUE; 3lgy X/?o  
 } h4xdE 0  
 else 62'0)Cy^  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); J@{ Bv%  
  if(hHook!=NULL) (8F?yBu  
   nHookCount++; s_?* R  
  return (hHook!=NULL); ,qh  
} [~JN n  
BOOL UnInit() >Nqkz?67  
{ '~=xP  
 if(nHookCount>1){ ky"7 ^  
  nHookCount--; fb=vO U  
  return TRUE; l{ { #tW  
 } X KeK;+  
 BOOL unhooked = UnhookWindowsHookEx(hHook); EqwA8? M  
 if(unhooked==TRUE){ md_s2d  
  nHookCount=0; \aRB   
  hHook=NULL; ;G&O"S><]c  
 } ~i {)J  
 return unhooked; C>-"*Lt  
} &G,v*5N8$K  
L7'n<$F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) KiHAm|,  
{  7cQw?C  
 BOOL bAdded=FALSE; ht!:e>z&4  
 for(int index=0;index<MAX_KEY;index++){ goWt!,&f  
  if(hCallWnd[index]==0){ }E_zW.{!  
   hCallWnd[index]=hWnd; j+v)I=  
   HotKey[index]=cKey; X,Q(W0-6$u  
   HotKeyMask[index]=cMask; iKO~#9OF  
   bAdded=TRUE; [qo* ,CRz  
   KeyCount++; Qd=/e pkm  
   break; 8[XNFFUZs  
  } TQfY%GKg(  
 } "K]4j]yU  
 return bAdded; @}}1xP4Sr  
} a MD?^  
yrb%g~ELGn  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @g?z>n n  
{ A#\X-8/  
 BOOL bRemoved=FALSE; xk<0QYv   
 for(int index=0;index<MAX_KEY;index++){ ?q7Gs)B=^'  
  if(hCallWnd[index]==hWnd){ -O6o^Dk  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8;bOw  
    hCallWnd[index]=NULL; 4K,&Q/Vdd7  
    HotKey[index]=0; SxyFFt  
    HotKeyMask[index]=0; %|||M=akk  
    bRemoved=TRUE; 7] H4E.(l  
    KeyCount--; C_;6-Q%V  
    break; w%"q=V  
   } Cq'r 'cBZ  
  } lTNkmQ  
 } -UE-v  
 return bRemoved; c73ZEd+j  
} AS398L  
#6nA^K}  
void VerifyWindow() IEj`:]d  
{ Z r*ytbt  
 for(int i=0;i<MAX_KEY;i++){ FL}8h/  
  if(hCallWnd!=NULL){ @bE?WXY  
   if(!IsWindow(hCallWnd)){ x6]?}Q>>D  
    hCallWnd=NULL; 8A qe'2IH=  
    HotKey=0; `8*$$JC  
    HotKeyMask=0; Il[WXt<S  
    KeyCount--; $NSYQF%aO  
   } O5"80z38[  
  } VzNH%  
 } r,\(Y@I  
} *+ayC{!  
nfR5W~%*:  
BOOL CHookApp::InitInstance() PI?[  
{ pgarGaeq  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); LPClE5  
 hins=AfxGetInstanceHandle(); ('Pd GV4V  
 InitHotkey(); ?J AzN  
 return CWinApp::InitInstance(); 9w|q':<  
} 3H2'HO  
NiF*h~ q  
int CHookApp::ExitInstance() n ~)%ou  
{ (TsgVq]L  
 VerifyWindow(); -8: @xG2  
 UnInit(); 7KLq-u-8  
 return CWinApp::ExitInstance(); $$w 1%#F =  
} NjLd-v"2  
n1V*VQV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $MR4jnTT  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :JmNy <  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Yy5F'RY  
#if _MSC_VER > 1000 UKdzJEhG  
#pragma once GWsFW[T?~  
#endif // _MSC_VER > 1000 `,z{70  
mE1*F'0a  
class CCaptureDlg : public CDialog .FyC4"b=c  
{ U/;Vge8{  
 // Construction <U";V)  
 public: 16U@o>O  
  BOOL bTray; -rBj-4|"  
  BOOL bRegistered; c_ i;'  
  BOOL RegisterHotkey(); _`_$U MK;  
  UCHAR cKey; od>.5{o  
  UCHAR cMask; XooAL0w  
  void DeleteIcon(); z'o+3 zq^  
  void AddIcon(); O@VmV>m  
  UINT nCount; 6\L,L &  
  void SaveBmp(); VEk|lX;2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .)Q'j94Q  
  // Dialog Data >jIc/yEYKI  
  //{{AFX_DATA(CCaptureDlg) e~1??k.;=  
  enum { IDD = IDD_CAPTURE_DIALOG }; psBBiHB[L  
  CComboBox m_Key; ~EymD *  
  BOOL m_bControl; =6hf'lP  
  BOOL m_bAlt; /$KW$NH4z  
  BOOL m_bShift; pbNVj~#6  
  CString m_Path; 2P*O^-zRp  
  CString m_Number;  }#1g;  
  //}}AFX_DATA i@6 kI C  
  // ClassWizard generated virtual function overrides uQ}kq7gd  
  //{{AFX_VIRTUAL(CCaptureDlg) !{+(oDN  
 public: &^"m6  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Y\\&~g42R2  
 protected: DBRTZES  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,k4 (b  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); BC3I{Y |  
  //}}AFX_VIRTUAL d*(1t\  
  // Implementation 00ho*p!E'  
 protected: QH eUpJ/^  
  HICON m_hIcon; u<[Y6m  
  // Generated message map functions l%fl=i~oN  
  //{{AFX_MSG(CCaptureDlg) ;iWCV& >w  
  virtual BOOL OnInitDialog(); W NCdk$  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); L=>N#QR7  
  afx_msg void OnPaint(); *Co+UJjT  
  afx_msg HCURSOR OnQueryDragIcon(); p("do1:  
  virtual void OnCancel(); W/+0gh7`,(  
  afx_msg void OnAbout(); }5|uA/B  
  afx_msg void OnBrowse(); q>?oV(sF  
  afx_msg void OnChange(); :'03*A_[  
 //}}AFX_MSG cVU[>gkg_  
 DECLARE_MESSAGE_MAP() d+kIof,  
}; is,_r(S  
#endif vU _#(jZ  
b=sc2 )3?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D<:9pLD(  
#include "stdafx.h" >:.Bn8-  
#include "Capture.h" 3s+D x$Ud  
#include "CaptureDlg.h" Z+4J4Ka^!(  
#include <windowsx.h> d]<tFx>CQW  
#pragma comment(lib,"hook.lib") p ^Ruf?>  
#ifdef _DEBUG )Fbkt(1  
#define new DEBUG_NEW !.!Ervi!N  
#undef THIS_FILE Q[ IaA"  
static char THIS_FILE[] = __FILE__; +'l@t bP  
#endif h c "n?  
#define IDM_SHELL WM_USER+1 3OTSLF/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); #'8E%4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6<2 7}S  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; AO/R 2a(:  
class CAboutDlg : public CDialog +%0+  
{ 8ARpjYZP  
 public: Q~`n%uYg\{  
  CAboutDlg(); Oo,<zS=ICk  
  // Dialog Data Pp?J5HW  
  //{{AFX_DATA(CAboutDlg) ,JR7N_"I  
  enum { IDD = IDD_ABOUTBOX }; B<W{kEY  
  //}}AFX_DATA yZ K j>P1  
  // ClassWizard generated virtual function overrides 6+>q1,<  
  //{{AFX_VIRTUAL(CAboutDlg) Gk<h_1WWK  
 protected: >zhbOkR9c  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support tH$Z_(5  
  //}}AFX_VIRTUAL 6HyQm?c>a  
  // Implementation N=(rl#<  
 protected: 6g)21Mh#  
  //{{AFX_MSG(CAboutDlg) |<OZa;c+  
  //}}AFX_MSG 3 *ZE``  
  DECLARE_MESSAGE_MAP() &BP%~  
}; M!,WU[mP  
 {sbQf7)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) V7.EDE2A3  
{ NcdOzx>  
 //{{AFX_DATA_INIT(CAboutDlg) mZmwCS8  
 //}}AFX_DATA_INIT 4e* rBTl  
} ~"8b\oLW  
z.FO6y6L  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) r@ ]{`qA  
{ YOqBIbp~&)  
 CDialog::DoDataExchange(pDX); J 5~bs*a8  
 //{{AFX_DATA_MAP(CAboutDlg) B#8!8  
 //}}AFX_DATA_MAP v]BN.SHE_  
} $Z #  
P@)z Nik[  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) lO[[iMHl<  
 //{{AFX_MSG_MAP(CAboutDlg) >%t"VpvR  
 // No message handlers R'He(x  
 //}}AFX_MSG_MAP >Qr(#Bt)  
END_MESSAGE_MAP() (Zp'|hx8o  
Fq:BRgCE  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) S'q (Qo  
: CDialog(CCaptureDlg::IDD, pParent) 0I1bY]*  
{ E`$d!7O  
 //{{AFX_DATA_INIT(CCaptureDlg) (wkeo{lx  
  m_bControl = FALSE; K^> +"  
  m_bAlt = FALSE; ki39$A'8  
  m_bShift = FALSE; "??$yMW  
  m_Path = _T("c:\\"); 46sV\In>?  
  m_Number = _T("0 picture captured."); rF'q\tJDz  
  nCount=0; 3nMXfh/  
  bRegistered=FALSE; w!7Hl9BW  
  bTray=FALSE; ZJ1 %  
 //}}AFX_DATA_INIT ry0P\wY}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !IF#L0z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); pxjb^GZ0  
} 7xqTTN6h  
a%cCR=s=  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =XuBan3B>  
{ !;>j(xc  
 CDialog::DoDataExchange(pDX); Y<odXFIS  
 //{{AFX_DATA_MAP(CCaptureDlg) r$d,ChzQn?  
  DDX_Control(pDX, IDC_KEY, m_Key); zyTeF~_  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Xi$2MyRd  
  DDX_Check(pDX, IDC_ALT, m_bAlt); sk6C/ '0:  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); B E!HM{-  
  DDX_Text(pDX, IDC_PATH, m_Path); r Z%l?(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ~"xc 3(h  
 //}}AFX_DATA_MAP [jU.58*  
} ]hRCB=G  
qXcHf6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ]y:2OP  
//{{AFX_MSG_MAP(CCaptureDlg) +/E`u|%|\]  
 ON_WM_SYSCOMMAND() 1%g%I8W%  
 ON_WM_PAINT() 4CCtLHb  
 ON_WM_QUERYDRAGICON() MF69n,(o  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) i|2CZ  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) as6a)t.^  
 ON_BN_CLICKED(ID_CHANGE, OnChange) JlR (U. "  
//}}AFX_MSG_MAP ~qekM>z  
END_MESSAGE_MAP() Wb4+U;C^!'  
.'aW~WR  
BOOL CCaptureDlg::OnInitDialog() XnR9/t  
{ $}+t|`*q8]  
 CDialog::OnInitDialog(); RDGefxv  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); p,0J $L  
 ASSERT(IDM_ABOUTBOX < 0xF000); Z7)la |  
 CMenu* pSysMenu = GetSystemMenu(FALSE); xvU@,bzz  
 if (pSysMenu != NULL) A0JlQE&U  
 { UaG })  
  CString strAboutMenu; d.>Zn?u4L  
  strAboutMenu.LoadString(IDS_ABOUTBOX); :%!` R72  
  if (!strAboutMenu.IsEmpty()) 6ZKSet8  
  { kbu.KU+  
   pSysMenu->AppendMenu(MF_SEPARATOR); vuN!7*d+  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); :Aq==N_/2  
  } R<]f[  
 } !X5n'1&  
 SetIcon(m_hIcon, TRUE); // Set big icon |}$ZOwc  
 SetIcon(m_hIcon, FALSE); // Set small icon $IUe](a{d  
 m_Key.SetCurSel(0); Qx<86aKkF  
 RegisterHotkey(); w`ebZa/j  
 CMenu* pMenu=GetSystemMenu(FALSE); ?y"= jn  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;l4 epN  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); L{&5Ets  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); mQwP-s  
 return TRUE; // return TRUE unless you set the focus to a control LlbRr.wL  
} 4}&$s  
D6z*J?3^#&  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $1KvL8  
{ cug=k  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @ (4$<><  
 { }*Z *wC  
  CAboutDlg dlgAbout; uPh/u!  
  dlgAbout.DoModal(); 3FetyW l'  
 } xWR<>Og.  
 else #u]'3en  
 { 3pU/Z bb,:  
  CDialog::OnSysCommand(nID, lParam); {&3{_Ml  
 } :9?y-X  
} u?xXZ]_u-  
L JW0UF|  
void CCaptureDlg::OnPaint() s[2>r#M  
{ MbbKo-7F$  
 if (IsIconic()) ` b$u w  
 { h_*!cuH  
  CPaintDC dc(this); // device context for painting }LYK:?_/  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); I)s~kA.e  
  // Center icon in client rectangle u /6b.hDO  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^VL",Nt  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?xX9o  
  CRect rect; nNj<!}HvV  
  GetClientRect(&rect); fC|NK+Xd`  
  int x = (rect.Width() - cxIcon + 1) / 2; m0M;f+^  
  int y = (rect.Height() - cyIcon + 1) / 2; o!$O+%4  
  // Draw the icon X7."hGu@  
  dc.DrawIcon(x, y, m_hIcon); i`st'\I  
 } Z~[EZgIg  
 else lJ>OuSd  
 { n=_jmR1  
  CDialog::OnPaint(); v#X l  
 } F4:giu ht  
} ^ s.necg0  
vXI2u;=y  
HCURSOR CCaptureDlg::OnQueryDragIcon() 5oOF|IYi  
{ I l2`c}9  
 return (HCURSOR) m_hIcon; ~Y)h[  
} t?l0L1;  
))9w)A@  
void CCaptureDlg::OnCancel() JnodDH ?  
{ <&47W  
 if(bTray) <0sT  
  DeleteIcon(); zLt7jxx  
  CDialog::OnCancel(); SN<Dxa8Iy  
} |K(j XZ)  
fg?4/]*T6  
void CCaptureDlg::OnAbout() <13').F  
{ CT2L }5L&  
 CAboutDlg dlg; (6g;FD:"6  
 dlg.DoModal(); i!KZg74V  
} + $Yld{i  
F<9S,  
void CCaptureDlg::OnBrowse() IVY{N/ 3|  
{ 3q}fDM(@J  
 CString str; xPp\OuwK  
 BROWSEINFO bi; ?yNg5z  
 char name[MAX_PATH]; pVN) k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); (U?*Z/  
 bi.hwndOwner=GetSafeHwnd(); Bk44 wz2 X  
 bi.pszDisplayName=name; +!6dsnr8  
 bi.lpszTitle="Select folder"; /$-Tg)o5i  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \""sf{S9  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); :i};]pR   
 if(idl==NULL) 8`]1Nt!*B  
  return; ~E^lKe  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ec4+wRWk85  
 str.ReleaseBuffer(); P/?'ea  
 m_Path=str; c|hT\1XR,  
 if(str.GetAt(str.GetLength()-1)!='\\') &Cykw$s  
  m_Path+="\\"; _$vAitUe4S  
 UpdateData(FALSE); B&},W*p  
} {vf4l4J(  
^1 U<,<  
void CCaptureDlg::SaveBmp() OL0W'C9oA  
{ bf*VY&S- T  
 CDC dc; @gM>Lxj  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S`t@L}  
 CBitmap bm; z4B-fS]  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3;-P(G@  
 int Height=GetSystemMetrics(SM_CYSCREEN); @!np 0#  
 bm.CreateCompatibleBitmap(&dc,Width,Height); "j*{7FBqk  
 CDC tdc; r@)_>(  
 tdc.CreateCompatibleDC(&dc); NW%u#MZ[h  
 CBitmap*pOld=tdc.SelectObject(&bm); qGK -f4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bsosva+  
 tdc.SelectObject(pOld); .?^a|]  
 BITMAP btm; 9]]isE8r  
 bm.GetBitmap(&btm); CtO;_ ;eD'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0; PV gO;9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xhTiOt6l  
 BITMAPINFOHEADER bih; > 3SZD  
 bih.biBitCount=btm.bmBitsPixel; yKb+bm&5:'  
 bih.biClrImportant=0; ==XO:P  
 bih.biClrUsed=0; hT DFIYV  
 bih.biCompression=0; fBw"<J{  
 bih.biHeight=btm.bmHeight; Tj3xK%K_r3  
 bih.biPlanes=1; a 9H^e<g  
 bih.biSize=sizeof(BITMAPINFOHEADER); sc)}r_|g  
 bih.biSizeImage=size; GB&^<@  
 bih.biWidth=btm.bmWidth; B{6wf)[O  
 bih.biXPelsPerMeter=0; yd+.hg&J  
 bih.biYPelsPerMeter=0; N)0V6q"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Bkaupvv9S  
 static int filecount=0; ]Te,m}E  
 CString name; xa&5o`>1G  
 name.Format("pict%04d.bmp",filecount++); PN"s ^]4  
 name=m_Path+name; oEN^O:9e  
 BITMAPFILEHEADER bfh; ed\umQ]   
 bfh.bfReserved1=bfh.bfReserved2=0; %K/zVYGm&  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z!eW_""wp  
 bfh.bfSize=54+size; </B<=tc  
 bfh.bfOffBits=54; duT'$}2@>  
 CFile bf; 0<4Nf]i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ kWW$*d$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); XhEJF !  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vlSSw+r9  
  bf.WriteHuge(lpData,size); [5T{`&  
  bf.Close(); e0 &x?U*/  
  nCount++; Wm#F~<$  
 } 6-6ha7]s  
 GlobalFreePtr(lpData); 5S/YVRXq  
 if(nCount==1) ~A-Y%P  
  m_Number.Format("%d picture captured.",nCount); yR'%UpaE  
 else kl+^0i  
  m_Number.Format("%d pictures captured.",nCount); !=SBeq  
  UpdateData(FALSE); *+rWn*L  
} DV5K)m&G  
+ebmve \+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) appWq}db  
{ ^0T DaZDLp  
 if(pMsg -> message == WM_KEYDOWN) tsf)+`vt  
 { j.:I{!R#  
  if(pMsg -> wParam == VK_ESCAPE) -qNun3  
   return TRUE; fnZ?YzLI  
  if(pMsg -> wParam == VK_RETURN) 2Q81#i'Cm  
   return TRUE; JC#M,j2  
 } 1/J3 9Y~+  
 return CDialog::PreTranslateMessage(pMsg); b2vCr F;  
} sO$X5S C9  
)z=L^ot  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E9 6` aF{]  
{ `SM37({c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *w,C5 f  
  SaveBmp(); =4_Er{AT  
  return FALSE; HB:VpNFn  
} H:5- S  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ d,+a}eTP'  
 CMenu pop; HpGI\s  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Zv|TvlyT"  
 CMenu*pMenu=pop.GetSubMenu(0); #Et%s8{  
 pMenu->SetDefaultItem(ID_EXITICON); a]4h5kJ';  
 CPoint pt; 'fS&WVR?  
 GetCursorPos(&pt); i8Xz'Sw07  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); FhJtiw@  
 if(id==ID_EXITICON) 6*r#m%|   
  DeleteIcon(); Zog&:]P'F  
 else if(id==ID_EXIT) fMl uVND  
  OnCancel(); `2l j{N  
 return FALSE; 3D^!U}E  
} /]>8V'e\  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); }_|qDMk+  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) I;GbS`  
 AddIcon(); E=$li  
 return res; Mo4k6@ht_  
} D@?Tq,= [  
ApSzkPv*  
void CCaptureDlg::AddIcon() ^jB17z[  
{ +.pri  
 NOTIFYICONDATA data; j[Z<|Da  
 data.cbSize=sizeof(NOTIFYICONDATA); [$e\?c  
 CString tip; `:#IZ  
 tip.LoadString(IDS_ICONTIP); lNbAt4]}f(  
 data.hIcon=GetIcon(0); \\9I:-j:p  
 data.hWnd=GetSafeHwnd(); z;Yo76P  
 strcpy(data.szTip,tip); c5- 56 Q  
 data.uCallbackMessage=IDM_SHELL; {NTMvJLm  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; D&-cNxh  
 data.uID=98; a%XF"*^v  
 Shell_NotifyIcon(NIM_ADD,&data); 6z2WN|78  
 ShowWindow(SW_HIDE); /L^pU-}Z0  
 bTray=TRUE; <1eD*sC?g  
} _2~+%{/m,  
5lrjM^E|  
void CCaptureDlg::DeleteIcon() H63?Erh>a  
{ F1GFn|OA  
 NOTIFYICONDATA data; p:?h)'bA<  
 data.cbSize=sizeof(NOTIFYICONDATA); \PL0-.t,  
 data.hWnd=GetSafeHwnd(); .8]buM5_G  
 data.uID=98; . /@C  
 Shell_NotifyIcon(NIM_DELETE,&data); YS0^ !7u  
 ShowWindow(SW_SHOW); U>0~/o  
 SetForegroundWindow(); Nf!WqD*je  
 ShowWindow(SW_SHOWNORMAL); VxW>Xx G0  
 bTray=FALSE; 8{DW$Z tR  
} f~ P~%  
34c+70x7  
void CCaptureDlg::OnChange() . ytxe!O  
{ S(#v<C,hd  
 RegisterHotkey(); ]Il}ymkIZ  
} 8/"R&yAh  
WbJ  
BOOL CCaptureDlg::RegisterHotkey() 5H }d\=z  
{ 9r=yfc!cS  
 UpdateData(); )Nt'Z*K*  
 UCHAR mask=0; 2OZ<t@\OY  
 UCHAR key=0; L#MgoBXr  
 if(m_bControl) 9+"ISXS  
  mask|=4; `;)op3A'  
 if(m_bAlt) %G/(7l[W  
  mask|=2; pF<KhE*V  
 if(m_bShift) XDyFe'1I  
  mask|=1; Oh; V%G  
  key=Key_Table[m_Key.GetCurSel()]; TR'<D9kn  
 if(bRegistered){ KmpKyc[  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); zT+ "Z(oz,  
  bRegistered=FALSE; <[A;i  
 } PM^Xh*~  
 cMask=mask; uFnq3m^u  
 cKey=key; 63HtZ=hO7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ]FEsN6  
 return bRegistered; [vn"r^P  
} WXFC e@  
3eN(Sw@p  
  四、小结 <RCeY(1  
~tZy-1  
  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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