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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: HqgTu`  
  p!'wOThO`  
  一、实现方法 5*buRYck0  
$#4z>~0  
  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: [v-?MS  
6@2p@eYo  
#pragma data_seg("shareddata") af{;4Cr  
HHOOK hHook =NULL; //钩子句柄 LWbWj ^  
UINT nHookCount =0; //挂接的程序数目 :yT~.AK}>1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 gb(\c:yg1R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 v03~=(  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey  v )7d  
static int KeyCount =0; (I.uQP~H  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 qe(X5 ?#;  
#pragma data_seg() `j>qOT  
P[P!WLr""  
  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。 n E-=7S L  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: {>FA ~}cX.  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cD s#5,  
cKey,UCHAR cMask) SATZ!  
{ 8gC(N3/E"  
 BOOL bAdded=FALSE; MPzqw)_-v  
 for(int index=0;index<MAX_KEY;index++){ ZuS+p0H"  
  if(hCallWnd[index]==0){ 2L<TqC{,-  
   hCallWnd[index]=hWnd; ]VJcV.7`  
   HotKey[index]=cKey; P >N\q  
   HotKeyMask[index]=cMask; ;JL@V}L,  
   bAdded=TRUE; f| N(~  
   KeyCount++; mA^>Y_:  
   break; `"ie57-  
  } A94VSUDA:  
 } .h+<m7  
 return bAdded; {bETHPCf  
} M~662]Ekk  
//删除热键 %aw/Y5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) tDN-I5q  
{ l"*>>/U k  
 BOOL bRemoved=FALSE; He!0&B\7h  
 for(int index=0;index<MAX_KEY;index++){ _ux 6SIyp`  
  if(hCallWnd[index]==hWnd){  j Mp{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ R:.7 c(s  
    hCallWnd[index]=NULL; ^\+6*YE 4  
    HotKey[index]=0; hChM hc  
    HotKeyMask[index]=0; ; wHuL\  
    bRemoved=TRUE; h y[_  
    KeyCount--; DBmcvC  
    break; Olxb`x  
   } =m/2)R{  
  } !d(!1fC  
 } g<.8iW 'c  
 return bRemoved; |e< U%v  
} D[-Ct  
+H<%)Lk J  
T!a8c<'V  
  DLL中的钩子函数如下: wG{o bsL.!  
V GvOwd)E  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) G,"$Erx  
{ V)(pe #P  
 BOOL bProcessed=FALSE; w@:o:yLS  
 if(HC_ACTION==nCode) [\.>BK  
 { gdG: &{|x  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ONfJ"Rp3  
   switch(wParam) $!vi:+ED  
   {  ~r>UjC_ B:  
    case VK_MENU: Mvcl9  
     MaskBits&=~ALTBIT; F 1zc4l6  
     break; 2Qk\}KWs  
    case VK_CONTROL: (/KF;J^M  
     MaskBits&=~CTRLBIT; &0C!P=-p  
     break; i{e<kKh  
    case VK_SHIFT: (Iq\+@xE=  
     MaskBits&=~SHIFTBIT; {(MG: B  
     break; 1b!l+ 8!  
    default: //judge the key and send message X1'Ze,34  
     break; & {/ u>,  
   } x)U;  
   for(int index=0;index<MAX_KEY;index++){ cXCczqabv  
    if(hCallWnd[index]==NULL) oaXD^ H\  
     continue; ut,"[+ J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *|3z($*U]  
    { T a[74;VO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); T6,lk1S'=  
     bProcessed=TRUE; (Z5#;rgem  
    } o{Ep/O`  
   } _k@l-Bj  
  } R 1b`(  
  else if((lParam&0xc000ffff)==1){ //有键按下 DtN6.9H2`  
   switch(wParam) e/3hb)#;  
   { MtB:H*pM  
    case VK_MENU: j w462h  
     MaskBits|=ALTBIT; ;lEiOF+d  
     break; Smu x&e  
    case VK_CONTROL: O^$Zz<  
     MaskBits|=CTRLBIT; .WPqK >79|  
     break; #lC{R^SL  
    case VK_SHIFT: igL^k`&5^"  
     MaskBits|=SHIFTBIT; $ g^;*>yr  
     break; p[GyQ2k)  
    default: //judge the key and send message ZM.g +-9  
     break; `ouzeu9}  
   } LN^8U  
   for(int index=0;index<MAX_KEY;index++){ 0A9cu,ZdUR  
    if(hCallWnd[index]==NULL) b#U%aPH  
     continue; /km3L7L%R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,m8*uCf  
    { "F}Ip&]hAG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Oe!&Jma*>  
     bProcessed=TRUE; gD\}CxtG  
    } DIAP2LR ?  
   } 7q=0]Hrg(D  
  } ]>o2P cb;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 3Cl9,Z"&6$  
   for(int index=0;index<MAX_KEY;index++){ Uf<vw3  
    if(hCallWnd[index]==NULL)  gk#rA/x  
     continue; f+Go8Lg=M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) y^rg%RV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #*/h*GNMs  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Z#O3s:`  
   } hH/ O2  
  } g1|c?#fwo  
 } hdL2`5RFF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); MO/N*4U2  
} g-}sVvM  
hzb|:  
  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: B$Z!E%a;  
nSiNSLv  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H%N+V r3O,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ||HIp9(3  
v],DBw9  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 6zWvd  
F! e`i-xt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) L />GYx  
{ POXn6R!mM1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) "-?Y UY`  
 { . 6dT5x8u  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lz 6 Aj  
  SaveBmp(); r|@?v,  
  return FALSE; WRyLpTr-  
 } J.l%H U  
 …… //其它处理及默认处理 V1`| j  
} Qknc.Z}  
zOdKB2_J7  
sD +G+  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 E=NY{| >  
{SJ7Yfs  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ?< QFW#:)  
R-fjxM*  
  二、编程步骤 f4_G[?9,  
AUde_ 1hi  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";  )S;ps  
"r"An"  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; |lwN!KVQ,  
JrTBe73.]j  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; fZ fiiE~7J  
5qEdN  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;  F`.7_D  
4/WCs$  
  5、 添加代码,编译运行程序。 QB,ad   
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三、程序代码 A5ID I<a  
Uc0'XPo3I  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ="R6YL  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Z-a(3&  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ yZ$;O0f&&  
#if _MSC_VER > 1000 ?/MXcI(  
#pragma once -%l, Zd9  
#endif // _MSC_VER > 1000 Y j\yO(o/  
#ifndef __AFXWIN_H__ qL.Y_,[[  
#error include 'stdafx.h' before including this file for PCH U(4_X[qD  
#endif KBe {  
#include "resource.h" // main symbols nk 9 K\I  
class CHookApp : public CWinApp reJ?38(  
{ m0\}Cc  
 public: vP NZFi-(  
  CHookApp(); =Gz>ZWF  
  // Overrides |qDfFGYf  
  // ClassWizard generated virtual function overrides QvN <uxm  
  //{{AFX_VIRTUAL(CHookApp) L0  2~FT  
 public: <h51KPo^P  
  virtual BOOL InitInstance(); 9[E$>o"%  
  virtual int ExitInstance(); *AR<DXE L  
  //}}AFX_VIRTUAL -yGm^EwP  
  //{{AFX_MSG(CHookApp) 1>y=i+T/b  
  // NOTE - the ClassWizard will add and remove member functions here. g GT,PP(k  
  // DO NOT EDIT what you see in these blocks of generated code ! bnu0*Zg>  
  //}}AFX_MSG RpP[ymMZJ  
  DECLARE_MESSAGE_MAP() G3^]Wwu  
}; rxp9B>~  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6G$tYfX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q8cPKDB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wg_CI,Kq  
BOOL InitHotkey(); t>@3RBEK  
BOOL UnInit(); E*CQG;^=N  
#endif 4 S9, tc&  
z2V8NUn  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Atq2pL"  
#include "stdafx.h" L)Ar{*xC  
#include "hook.h" }QW~.>`  
#include <windowsx.h> W?J[K;<  
#ifdef _DEBUG S_VncTIO  
#define new DEBUG_NEW -f|^}j?  
#undef THIS_FILE @SG"t,5s  
static char THIS_FILE[] = __FILE__; +u:O AsR  
#endif R bc2g"]  
#define MAX_KEY 100 FXEfD"  
#define CTRLBIT 0x04 D K_v{R  
#define ALTBIT 0x02 Ny7=-]N4{"  
#define SHIFTBIT 0x01 nL 07^6(  
#pragma data_seg("shareddata") [mzF)/[_2  
HHOOK hHook =NULL; Le:mMd= G  
UINT nHookCount =0; qq3Qd,$Z  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey y"L`bl A9}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT O[p^lr(B7  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey gJ8 c]2c  
static int KeyCount =0; D)7$M]d%  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0QH3,Ps1C  
#pragma data_seg() L8xprHgL  
HINSTANCE hins; Zi@+T  
void VerifyWindow(); KXA)i5z  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,W8Iabi^  
//{{AFX_MSG_MAP(CHookApp) C*6)Ut '  
// NOTE - the ClassWizard will add and remove mapping macros here. f%[ukMj&  
// DO NOT EDIT what you see in these blocks of generated code! o ]jP3 $t;  
//}}AFX_MSG_MAP UMi`u6#  
END_MESSAGE_MAP() VD&3%G!  
?[1qC=[Z<  
CHookApp::CHookApp() lF"(|n"R  
{ ~nc([%!=  
 // TODO: add construction code here, {2gd4[:  
 // Place all significant initialization in InitInstance -Dq:Y,%q  
} q;0&idYC  
-hFyqIJW  
CHookApp theApp; +ls*//R  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) : tqm2t  
{ Dzjt|U0ru9  
 BOOL bProcessed=FALSE; \j})Kul  
 if(HC_ACTION==nCode) bd P,Zqd  
 { {!eANm'  
  if((lParam&0xc0000000)==0xc0000000){// Key up c[RL Yu  
   switch(wParam) a(DZGQ-as  
   { Y{2d4VoW6  
    case VK_MENU: `CEj 4  
     MaskBits&=~ALTBIT; =>z tBw\  
     break; 4zfRD`;  
    case VK_CONTROL: aGk%I  
     MaskBits&=~CTRLBIT; ?(ls<&s{w  
     break; 8u5 'g1M  
    case VK_SHIFT: ,\9mAt1O  
     MaskBits&=~SHIFTBIT; S O:V|Tfj  
     break; ^N2M/B|0  
    default: //judge the key and send message ._MAHBx+G  
     break; dGD^op,6g  
   } j5h 6u,^:  
   for(int index=0;index<MAX_KEY;index++){ d J%Rk#?;A  
    if(hCallWnd[index]==NULL) M$4=q((0  
     continue; b'oGt,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /`O]etr`d  
    { 1H,tP|s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); TFYTvUn  
     bProcessed=TRUE; =_m9so  
    } `=}UFu  
   } :{ WrS  
  } 'bI~61{A  
  else if((lParam&0xc000ffff)==1){ //Key down dbuJ~?D,  
   switch(wParam) 6+B{4OY  
   { 'tu@`7*  
    case VK_MENU: hN_f h J  
     MaskBits|=ALTBIT; Am4^v?q  
     break; W6Aj<{\F  
    case VK_CONTROL: Z-h7  
     MaskBits|=CTRLBIT; +5t bK  
     break; Ds%&Mi  
    case VK_SHIFT: sId(PT^  
     MaskBits|=SHIFTBIT; =1 BNCKT<  
     break; %X"m/4c8}  
    default: //judge the key and send message hUT^V(  
     break; z1'FmwT  
   } ~@4ZV  
   for(int index=0;index<MAX_KEY;index++) 6(J4IzZ  
   { euj8p:+X  
    if(hCallWnd[index]==NULL) *fH_lG%  
     continue; pba8=Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,s><kHJ  
    { 'uKkl(==%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %t`SSW7I  
     bProcessed=TRUE; T~o{woq}g  
    } B&i0j5L  
   } V@ _-H gg  
  } (e8G (  
  if(!bProcessed){ LZc$:<J<6  
   for(int index=0;index<MAX_KEY;index++){ lTr*'fX  
    if(hCallWnd[index]==NULL) a\{1UD  
     continue; ]KXMGH_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 8L -4}!~C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); =%3b@}%HqS  
   } `e $n$Bh  
  } ~3bZ+*H>  
 } 45+%K@@x  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2\nN4WL 5.  
} \/*Nf?;  
Wyq~:vU.S  
BOOL InitHotkey() 3xzkZ8]/  
{ fzS`dL5,W  
 if(hHook!=NULL){ mGe|8In  
  nHookCount++; @1qdd~B}  
  return TRUE; 9:%n=URd  
 } `D)Lzm R  
 else AUxM)H  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (/SGT$#8  
  if(hHook!=NULL) i>Fvmw  
   nHookCount++; ss`P QN  
  return (hHook!=NULL); -*|:v67C&  
} ZMoJ#p(  
BOOL UnInit() Gg9VS&VI  
{ -Aa]aDAz68  
 if(nHookCount>1){ zUs~V`0  
  nHookCount--; `k(u:yGK  
  return TRUE; OQ(D5GR:4  
 } o#xgrMB  
 BOOL unhooked = UnhookWindowsHookEx(hHook); T0`"kjE  
 if(unhooked==TRUE){ !8Z2X!$m{<  
  nHookCount=0; }3f BY@  
  hHook=NULL; hhpv\1h#  
 } &:c:9w  
 return unhooked; F<Hqo>G  
} 4L5o\'X  
.!(,$'(@=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #e.jY_  
{ X*sr  
 BOOL bAdded=FALSE; wfxOx$]z K  
 for(int index=0;index<MAX_KEY;index++){ 4l&"]9D  
  if(hCallWnd[index]==0){ gEv->pc  
   hCallWnd[index]=hWnd; ~n[b^b  
   HotKey[index]=cKey; =s'XR@  
   HotKeyMask[index]=cMask; &:V@2_6"  
   bAdded=TRUE; ,AH0*L  
   KeyCount++; 4K9Rpm  
   break; 'aD6>8/Hj  
  } nW4Vct  
 } `,wc Q  
 return bAdded; u12zRdn  
} 8RdP:*HY  
y(bsCsV&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) yjEI/9_  
{ $ph0ag+  
 BOOL bRemoved=FALSE; d5DP^u  
 for(int index=0;index<MAX_KEY;index++){ $]@O/[  
  if(hCallWnd[index]==hWnd){ gbm0H-A:*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Tu]&^[B('  
    hCallWnd[index]=NULL; Y4mC_4EU  
    HotKey[index]=0; [E>R.Oe  
    HotKeyMask[index]=0; fO].e"}  
    bRemoved=TRUE; ]7a;jNQu  
    KeyCount--; [6D>f?z  
    break; :GQ UM6  
   } I4)Nb WQ  
  } ?75\>NiR  
 } dQ:?<zZ  
 return bRemoved; K7IyCcdB  
} Kb}MF9?:e  
K~c^*;F  
void VerifyWindow() GDF{Lf)/v  
{ U1l0Uke  
 for(int i=0;i<MAX_KEY;i++){ fr+@HUOxsl  
  if(hCallWnd!=NULL){ /b.$jnqL  
   if(!IsWindow(hCallWnd)){ [?-]PZ  
    hCallWnd=NULL; ;}LJh8_  
    HotKey=0; RfKc{V  
    HotKeyMask=0; `f@{Vcr% i  
    KeyCount--; %drJ p6n%  
   } 3&es]1b  
  } }wG,BB%N  
 } wGPotPdE2  
} {  |s/]W  
>):m-I  
BOOL CHookApp::InitInstance() mA& =q_gS  
{ QwBXlO?  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); +p3 Z#KoC  
 hins=AfxGetInstanceHandle(); /Zc#j^_  
 InitHotkey(); 2s 7mI'  
 return CWinApp::InitInstance(); e1Ob!N-  
} ITONpg[f  
!g8*r"[UJ  
int CHookApp::ExitInstance() \M9 h&I\7  
{ [*Q-nZ/L  
 VerifyWindow(); ! ,@ZQS  
 UnInit(); Zvxp%dES  
 return CWinApp::ExitInstance(); pA<eTlH  
} t\8&*(&3F  
C1d 04Q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'Q5&5UrBr  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) c4\C[$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ MU|{g 5/ )  
#if _MSC_VER > 1000 8Jr1_a  
#pragma once ?0{yq>fTu  
#endif // _MSC_VER > 1000 i^WIr h3a  
U IfH*6X  
class CCaptureDlg : public CDialog W6vf=I@f  
{ lWbZ=x_0  
 // Construction G]4OFz+  
 public: q/$ GE,"  
  BOOL bTray; & 1[y"S  
  BOOL bRegistered; ]u+MTW;  
  BOOL RegisterHotkey(); m4@MxQm  
  UCHAR cKey; /}=a{J  
  UCHAR cMask; 4d0#86l~J/  
  void DeleteIcon(); =L"^.c@  
  void AddIcon(); NvQ%J+  
  UINT nCount; .)7:=  
  void SaveBmp(); ryg4h Hspl  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [ByQ;s5tY  
  // Dialog Data z>G;(F2  
  //{{AFX_DATA(CCaptureDlg) oU8>Llt=$  
  enum { IDD = IDD_CAPTURE_DIALOG }; u_LY\'n  
  CComboBox m_Key; ACb/ITu  
  BOOL m_bControl; s"i~6})K<$  
  BOOL m_bAlt; ,t1vb3  
  BOOL m_bShift; (= 9 wo  
  CString m_Path; hT'=VN  
  CString m_Number; aVwH  
  //}}AFX_DATA P/MM UmO  
  // ClassWizard generated virtual function overrides ~].ggcl`w  
  //{{AFX_VIRTUAL(CCaptureDlg) "mOI!x f@a  
 public: X"j>=DEX  
  virtual BOOL PreTranslateMessage(MSG* pMsg); kh3<V'k]  
 protected: !2$ z *C2;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %k2FPmA6  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dCeX}Z  
  //}}AFX_VIRTUAL e0 u,zg+m  
  // Implementation U'y,YtF@  
 protected: :I \9YzSs@  
  HICON m_hIcon; @DuK#W"E u  
  // Generated message map functions 03([@d6<E  
  //{{AFX_MSG(CCaptureDlg) mRwT_(;t  
  virtual BOOL OnInitDialog(); ^P?vkO"pB?  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); WS:5MI,OL  
  afx_msg void OnPaint(); -f?Ah  
  afx_msg HCURSOR OnQueryDragIcon(); ^,TTwLy- t  
  virtual void OnCancel(); R-  
  afx_msg void OnAbout(); =1Z;Ma<;  
  afx_msg void OnBrowse(); WhFS2Jl0  
  afx_msg void OnChange(); \3zp)J  
 //}}AFX_MSG rQJ"&CapT  
 DECLARE_MESSAGE_MAP() K"\MU  
}; 6):Xzx,  
#endif l}rS{+:wK  
GX?*1  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file rk|a5-i  
#include "stdafx.h" fxgU~'  
#include "Capture.h" pZk6 w1d!  
#include "CaptureDlg.h" rC BfD  
#include <windowsx.h> ,PECYwegkt  
#pragma comment(lib,"hook.lib") lZW K2  
#ifdef _DEBUG ]Bnwk o  
#define new DEBUG_NEW %WGuy@tL  
#undef THIS_FILE ZCYS\E 7X  
static char THIS_FILE[] = __FILE__; &:3Z.G  
#endif _1L(7|^~y[  
#define IDM_SHELL WM_USER+1 so+4B1$)q  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !^y y0`k6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jQ=~g-y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +7U  
class CAboutDlg : public CDialog nX^1$')gp  
{ l?8)6z#Zl  
 public:  f:wd&V  
  CAboutDlg(); +th%enRB  
  // Dialog Data bA@P}M)X  
  //{{AFX_DATA(CAboutDlg) e;VIL 2|  
  enum { IDD = IDD_ABOUTBOX }; Kesy2mE  
  //}}AFX_DATA 0 [8=c&F  
  // ClassWizard generated virtual function overrides aDL*W@1S  
  //{{AFX_VIRTUAL(CAboutDlg) *hdC?m. _  
 protected: <7XT\?%F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,*Z.  
  //}}AFX_VIRTUAL F[Q!d6  
  // Implementation (qBvoLkF9N  
 protected: ys'T~Cs  
  //{{AFX_MSG(CAboutDlg) @hif$  
  //}}AFX_MSG v,OpTu:1  
  DECLARE_MESSAGE_MAP() u6Je@e_!  
}; --fFpM3EvS  
&(blN.2  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) bMKL1+y(  
{ QI}E4-s8  
 //{{AFX_DATA_INIT(CAboutDlg) U# JIs  
 //}}AFX_DATA_INIT ~AZWds(,N  
} nfdq y)  
` ;)ZGY\  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) o.7{O,v  
{ 5$rSEVg9  
 CDialog::DoDataExchange(pDX); h}L}[   
 //{{AFX_DATA_MAP(CAboutDlg) EQ<RDhC@b  
 //}}AFX_DATA_MAP /6+NU^  
} @|\R}k%(  
@=Fi7M  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %o w^dzW  
 //{{AFX_MSG_MAP(CAboutDlg) p fT60W[m  
 // No message handlers A],ooiq<  
 //}}AFX_MSG_MAP }uY!(4Rw  
END_MESSAGE_MAP() O+~ 7l?o  
P"_$uO(5x  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) qO@@8/l  
: CDialog(CCaptureDlg::IDD, pParent) ~9\zWRh  
{ r0]4=6U  
 //{{AFX_DATA_INIT(CCaptureDlg) q| .dez'  
  m_bControl = FALSE; # 1.YKo  
  m_bAlt = FALSE; )G1P^WV4  
  m_bShift = FALSE; n_u1&a'  
  m_Path = _T("c:\\"); 6oD\-H  
  m_Number = _T("0 picture captured."); k`{7}zxS  
  nCount=0; ihCIh6  
  bRegistered=FALSE; !CUoHTmB  
  bTray=FALSE; TsQU6NNE  
 //}}AFX_DATA_INIT nV_8Ke  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 d3;qsUh$yv  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); x=Hndx^  
} Q.U$nph\%d  
P\nC?!Q%c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) M*eJ JY  
{ 3oy~=  
 CDialog::DoDataExchange(pDX); >vbY<HGt  
 //{{AFX_DATA_MAP(CCaptureDlg) #z'uRHx%=0  
  DDX_Control(pDX, IDC_KEY, m_Key); Dw<k3zaW  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); +}xaQc:0|  
  DDX_Check(pDX, IDC_ALT, m_bAlt); h"+ `13  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); MV>$BW  
  DDX_Text(pDX, IDC_PATH, m_Path); *QGm/ /b  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1O/ g&u  
 //}}AFX_DATA_MAP t.Nb? /  
} 2&!bfq![  
.L6Zm U  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .;7> y7$*  
//{{AFX_MSG_MAP(CCaptureDlg) Z{6kWA3Kk  
 ON_WM_SYSCOMMAND() E#wS_[  
 ON_WM_PAINT() gJ$K\[+  
 ON_WM_QUERYDRAGICON() I@#;nyAj"  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Dnf*7)X  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) _~u2: yl (  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ZraT3  
//}}AFX_MSG_MAP rjx6Djo>  
END_MESSAGE_MAP() a>O9pX  
J%lgR  
BOOL CCaptureDlg::OnInitDialog() e4>"92hX  
{ *hLQ  
 CDialog::OnInitDialog(); {LHR!~d}5f  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); (~~w7L s  
 ASSERT(IDM_ABOUTBOX < 0xF000); "es?=  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4NN$( S-W  
 if (pSysMenu != NULL) 7nq3S  
 { 4QOEw-~w&s  
  CString strAboutMenu; vQ}6y  
  strAboutMenu.LoadString(IDS_ABOUTBOX); b75 $?_+  
  if (!strAboutMenu.IsEmpty()) ?p<.Fv8.  
  { uw(NG.4  
   pSysMenu->AppendMenu(MF_SEPARATOR); s*/bi W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); yS(}:'`r  
  } !~]<$WZV  
 } }Ew hj>w  
 SetIcon(m_hIcon, TRUE); // Set big icon |*/[`|*G  
 SetIcon(m_hIcon, FALSE); // Set small icon 3DgsI7-F  
 m_Key.SetCurSel(0); sZ,Y60s8a  
 RegisterHotkey(); Isy'{ -H  
 CMenu* pMenu=GetSystemMenu(FALSE); 7{@l%jx][  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ($w@Z/;  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 0& >H^  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); SP*fv`  
 return TRUE; // return TRUE unless you set the focus to a control v3d&*I  
} ".^VI2T  
G7!W{;@I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) m %;D  
{ DGW+>\G  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) NA3 \  
 { osARA3\Xt  
  CAboutDlg dlgAbout; )SryDRT  
  dlgAbout.DoModal(); xv{O^Ie+S  
 } Yim<>. !  
 else >_OYhgs1w  
 { 7 >iU1zy  
  CDialog::OnSysCommand(nID, lParam); g V5zSudW  
 } D8&`R  
} ,Ys"W x  
-=s(l.?Hm5  
void CCaptureDlg::OnPaint() O,aS`u &  
{ n1 6 `y}  
 if (IsIconic()) 0Wa}<]:^  
 { G,Z^g|6  
  CPaintDC dc(this); // device context for painting .itw04Uru  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); toN^0F?Qm  
  // Center icon in client rectangle H~ZV *[A`  
  int cxIcon = GetSystemMetrics(SM_CXICON); sGh(#A0Pt  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2(5ebe[  
  CRect rect; qTZFPfyU  
  GetClientRect(&rect); n  -(  
  int x = (rect.Width() - cxIcon + 1) / 2; su*Pk|6%  
  int y = (rect.Height() - cyIcon + 1) / 2; m]i @ +C  
  // Draw the icon kmzH'wktt  
  dc.DrawIcon(x, y, m_hIcon); 6T 8!xyi-+  
 } DCqY|4Qc  
 else .ERO|$fv  
 { ]Q]W5WDe:  
  CDialog::OnPaint(); f&v9Q97=  
 } 9zYVC[o  
} ctE\ q  
uqz]J$  
HCURSOR CCaptureDlg::OnQueryDragIcon() SBA?^T  
{ X7k.zlH7T  
 return (HCURSOR) m_hIcon; iq( )8nxi  
} `al<(FwGE  
>pUtwIP  
void CCaptureDlg::OnCancel() =UyLk-P w  
{ jw-0M1B  
 if(bTray) PkI:*\R  
  DeleteIcon(); 87hq{tTs]  
  CDialog::OnCancel(); &0f5:M{P  
} %v20~xW :o  
9z6XF]A  
void CCaptureDlg::OnAbout() y;/VB,4V  
{ (o3 Iy  
 CAboutDlg dlg; jKt7M>P  
 dlg.DoModal(); k)EX(T\  
} >EY3/Go>  
vpmj||\-  
void CCaptureDlg::OnBrowse() .\>v0Du  
{ MEB it  
 CString str; RX/hz|   
 BROWSEINFO bi; vWAL^?HUP  
 char name[MAX_PATH]; I`NjqyTW  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); "DYJ21Ut4  
 bi.hwndOwner=GetSafeHwnd(); U&O: _>~  
 bi.pszDisplayName=name; N-lkYL-%\j  
 bi.lpszTitle="Select folder"; sr8cYLm5R  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ]U"94S U:)  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 8OgLn?"P  
 if(idl==NULL) H;RwO@v  
  return; "AE5 V'  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Omd .9  
 str.ReleaseBuffer(); ]+X@ 7  
 m_Path=str; t.mVO]dsj  
 if(str.GetAt(str.GetLength()-1)!='\\') -GxaV #{  
  m_Path+="\\"; m*JaXa  
 UpdateData(FALSE); UFMA:o,  
} eM8}X[  
<)1qt 9  
void CCaptureDlg::SaveBmp() F$)[kP,wtO  
{ | Bi!  
 CDC dc; om1eQp0N  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); HTG%t/S  
 CBitmap bm; ti \wg  
 int Width=GetSystemMetrics(SM_CXSCREEN); >y"+ -7V)  
 int Height=GetSystemMetrics(SM_CYSCREEN); .9wk@C(Eh_  
 bm.CreateCompatibleBitmap(&dc,Width,Height); =?!wXOg_  
 CDC tdc; ;+"+3  
 tdc.CreateCompatibleDC(&dc); \ Yx/(e  
 CBitmap*pOld=tdc.SelectObject(&bm); %7|9sQ:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `nu''B H  
 tdc.SelectObject(pOld); Ofs <EQ  
 BITMAP btm; $< JaLS  
 bm.GetBitmap(&btm); 9 AJ(&qY(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; <7~'; K  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); A}l3cP; `#  
 BITMAPINFOHEADER bih; dkz=CY3p%X  
 bih.biBitCount=btm.bmBitsPixel; q.;u?,|E/  
 bih.biClrImportant=0; s7F.sg  
 bih.biClrUsed=0; 4t=G   
 bih.biCompression=0; PUUwv_  
 bih.biHeight=btm.bmHeight; wRVUu)  
 bih.biPlanes=1; uA< n  
 bih.biSize=sizeof(BITMAPINFOHEADER); ez| )ph7  
 bih.biSizeImage=size; ]9^sa-8  
 bih.biWidth=btm.bmWidth; ~sh`r{0  
 bih.biXPelsPerMeter=0; 1jcouD5?H  
 bih.biYPelsPerMeter=0; }~L.qG  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); E 7{U |\  
 static int filecount=0; H*}y^ )x  
 CString name; o2F)%TDY  
 name.Format("pict%04d.bmp",filecount++); NCDvo bYJ  
 name=m_Path+name; {z{bY\  
 BITMAPFILEHEADER bfh; y gz6C  
 bfh.bfReserved1=bfh.bfReserved2=0; A*\.NTM  
 bfh.bfType=((WORD)('M'<< 8)|'B'); z:wutqru  
 bfh.bfSize=54+size; %%[LKSTb  
 bfh.bfOffBits=54; x<ZJb  
 CFile bf; -Fe?R*-g  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #pnI\  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); )P sY($ &  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Bx< <~[Ws}  
  bf.WriteHuge(lpData,size); lN Yt`xp  
  bf.Close(); @u6B;)'l  
  nCount++; a!v1M2>  
 } t7aefV&_,  
 GlobalFreePtr(lpData); :/nj@X6  
 if(nCount==1) cPlZXf  
  m_Number.Format("%d picture captured.",nCount); H*PSR  
 else eceP0x  
  m_Number.Format("%d pictures captured.",nCount); fumm<:<CLO  
  UpdateData(FALSE); U2W|:~KM  
} SHfy".A6.0  
C&(N I  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ds<2I,t  
{ ``hf=`We  
 if(pMsg -> message == WM_KEYDOWN) ~x1$h#Cx'  
 { !2f[}.6+  
  if(pMsg -> wParam == VK_ESCAPE) .(cw>7e3D  
   return TRUE; R\!2l |_  
  if(pMsg -> wParam == VK_RETURN) I=`U7Bis"  
   return TRUE; Fj2BnM3#  
 } ,?^ p(w  
 return CDialog::PreTranslateMessage(pMsg); , s"^kFl  
} #V~me  
f6&iy$@   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0Qf,@^zL*  
{ P/W XaE4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [M=7M}f;  
  SaveBmp(); ig/xv  
  return FALSE; cK(C&NK  
} GjvOM y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ VA#"r!1  
 CMenu pop; I&x=;   
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3YR!Mq$|~  
 CMenu*pMenu=pop.GetSubMenu(0); 0AL=S$B)  
 pMenu->SetDefaultItem(ID_EXITICON); p8Qk 'F=h  
 CPoint pt; |v 3T!  
 GetCursorPos(&pt); vdc\R?  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); gCB |DY  
 if(id==ID_EXITICON) x??+~$}\*-  
  DeleteIcon(); Swig;`  
 else if(id==ID_EXIT) B|C2lu  
  OnCancel(); c(xrP/yOwi  
 return FALSE; Ng2twfSl$  
} \@c,3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 52Z2]T c ,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Yg||{  
 AddIcon(); Ga^"1TZ x  
 return res;  iu=7O  
} :(P9mt  
8e1UmM[  
void CCaptureDlg::AddIcon() 0ypNUG}   
{ "*e$aTZB\  
 NOTIFYICONDATA data; qN9(S:_Px  
 data.cbSize=sizeof(NOTIFYICONDATA); -=)H{  
 CString tip; }C"%p8=HM  
 tip.LoadString(IDS_ICONTIP); V^bwXr4f  
 data.hIcon=GetIcon(0); ?BeiY zg  
 data.hWnd=GetSafeHwnd(); p>v$FiV2N  
 strcpy(data.szTip,tip); Nk? ^1n$  
 data.uCallbackMessage=IDM_SHELL; g}k`o!q  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Y!w`YYKP  
 data.uID=98; wd8 l$*F*  
 Shell_NotifyIcon(NIM_ADD,&data); *&^Pj%DX  
 ShowWindow(SW_HIDE); B" 1c  
 bTray=TRUE; Bq%Jh  
} rr],DGg+B]  
0d)M\lG  
void CCaptureDlg::DeleteIcon() 6H.0vN&  
{ wDal5GJp  
 NOTIFYICONDATA data; }HYbS8'  
 data.cbSize=sizeof(NOTIFYICONDATA); 2lH&  
 data.hWnd=GetSafeHwnd(); 3Ei#q+7  
 data.uID=98; BLQ6A<  
 Shell_NotifyIcon(NIM_DELETE,&data); {HltvO%8  
 ShowWindow(SW_SHOW); $w`x vX  
 SetForegroundWindow(); pP&7rRhw  
 ShowWindow(SW_SHOWNORMAL); O:;w3u7;u  
 bTray=FALSE; c_$=-Khk  
} -P$PAg5"2  
%rL.|q9  
void CCaptureDlg::OnChange() )l C)@H}  
{ 5y.WMNNv{  
 RegisterHotkey();  MzdV2.  
} & p  
NRs13M<ftf  
BOOL CCaptureDlg::RegisterHotkey() dd%6t  
{ /=nJRC3.  
 UpdateData(); e5ZX   
 UCHAR mask=0; 24 'J  
 UCHAR key=0; z% ?+AM)P  
 if(m_bControl) @e.C"@G  
  mask|=4; X:"i4i[}{9  
 if(m_bAlt) _Eo[7V{NY  
  mask|=2; |.: q  
 if(m_bShift) ^eY!U%.  
  mask|=1; v!~fs)cdE|  
  key=Key_Table[m_Key.GetCurSel()]; MS~(D.@ZS  
 if(bRegistered){ Y8~"vuIE5  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); V(I8=rVH  
  bRegistered=FALSE; QOGvC[*`<T  
 } i+ ?^8#  
 cMask=mask; C_}]`[  
 cKey=key; {H>gtpVy  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); mp1@|*Sn  
 return bRegistered; F]O`3 e=!  
} HAdg/3Hw  
?=sDM& '  
  四、小结 :%=Xm   
@Md/Q~>  
  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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