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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: %*lOzC  
  c_<m8b{AEF  
  一、实现方法 PuqT&|wP l  
ehl) {Dd^  
  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: -$J\BkI  
#"fBF/Q  
#pragma data_seg("shareddata") /Y:&307q  
HHOOK hHook =NULL; //钩子句柄 RrRrB"!8nR  
UINT nHookCount =0; //挂接的程序数目 N_lQz(nG/2  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 W# E`h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 *P_(hG&c  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }20 Q`?  
static int KeyCount =0; Uc%(#I]Mi  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 H%> E6rVB  
#pragma data_seg() G1z[v3T  
$Mm=5 K%  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 l7]:b8  
%>Z^BM<e  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: "<H.F 87Z)  
F0W4B  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \:9dt8(-U  
cKey,UCHAR cMask) wv>*g:El'  
{ zD:"O4ZM^^  
 BOOL bAdded=FALSE; 1r;]==  
 for(int index=0;index<MAX_KEY;index++){ k'E3{8<!  
  if(hCallWnd[index]==0){ Mh"DPt9@J  
   hCallWnd[index]=hWnd; %yX?4T;b  
   HotKey[index]=cKey; 2jV.\C k  
   HotKeyMask[index]=cMask; losm<  
   bAdded=TRUE; [Hw  
   KeyCount++; rXc-V},az8  
   break; QE*O~Yj  
  } 16ahU$@-  
 } ~A2{$C  
 return bAdded;  \B) a57  
} r:lv[/ D  
//删除热键 QPB@qx#@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A&X(\c M  
{ EjW3_ %  
 BOOL bRemoved=FALSE; ~sT/t1Rp  
 for(int index=0;index<MAX_KEY;index++){ )zz^RB\p  
  if(hCallWnd[index]==hWnd){ 0YK`wuZGS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =NLsT.aa  
    hCallWnd[index]=NULL; gcDo o2RE  
    HotKey[index]=0; ms2y[b  
    HotKeyMask[index]=0; a3D''Ra  
    bRemoved=TRUE; ef8_w6i  
    KeyCount--; P,U$ X+  
    break; ([SrIG>X  
   } \^a(B{   
  } t&}Z~Zp  
 } "} =RPc%9  
 return bRemoved; 2u9O+]EP  
} b5K6F:D22  
I,;@\  
P"d7Af  
  DLL中的钩子函数如下: \Jm fQrBQ  
A/V"&H[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /{@^h#4M1  
{ w/_n$hX  
 BOOL bProcessed=FALSE; VQ wr8jXye  
 if(HC_ACTION==nCode) " !43,!<  
 { \ldjWc<S  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z{XN1'/V  
   switch(wParam) &c!d}pU}  
   {  8axz`2`  
    case VK_MENU: !-%fCg(B  
     MaskBits&=~ALTBIT; !kCMw%[  
     break; b-4g HW  
    case VK_CONTROL: Axp#8  
     MaskBits&=~CTRLBIT; b{Srd3  
     break; .x\fPjB   
    case VK_SHIFT:  +6paM  
     MaskBits&=~SHIFTBIT; -+MGs]),  
     break; v`&  
    default: //judge the key and send message qZw4"&,j$  
     break; 74f3a|vx/  
   } GjTj..G/  
   for(int index=0;index<MAX_KEY;index++){ }xhat,9  
    if(hCallWnd[index]==NULL) mBW E^  
     continue; 7 0pt5O3]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eyq\a'tyB  
    { ybnq;0}$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 5A|4  
     bProcessed=TRUE; vwy10PlqL  
    } *;^!FBT  
   } .gY}}Q  
  } 6x18g(KbP  
  else if((lParam&0xc000ffff)==1){ //有键按下 X^204K%:  
   switch(wParam) yLv jfP1  
   { "mT95x\NA\  
    case VK_MENU: "s[Y$!#  
     MaskBits|=ALTBIT; ;/tZsE{  
     break; Qdepzo>E  
    case VK_CONTROL: /P_1vQq  
     MaskBits|=CTRLBIT; dzA5l:5  
     break; IX/FKSuq  
    case VK_SHIFT: !%w#h0(b  
     MaskBits|=SHIFTBIT; D2hEI2S  
     break; OPm ?kr  
    default: //judge the key and send message g7*"*%v 2  
     break; 38Rod]\E  
   } $7Sbz&)y3  
   for(int index=0;index<MAX_KEY;index++){ si`{>e~`6P  
    if(hCallWnd[index]==NULL) ;VQFz&Q$u  
     continue; JtB"Dh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D@]gc&JN[  
    { VyRU_<xP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ZHPsGHA  
     bProcessed=TRUE;  ?gZJ v  
    } a2:Tu  
   } RX]x3-  
  } G`!ff  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !: e0cV  
   for(int index=0;index<MAX_KEY;index++){ dU!`aPL?  
    if(hCallWnd[index]==NULL) NF?FEUoxz  
     continue; iQ[0d.(A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9C$#A+~C  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `b(y 5Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !83x,*O  
   } b0\'JZ  
  } &p?Oo^  
 } e"jA#Y #  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); NW-l_]k  
} >v4k_JX  
GPqF>   
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: V<} ^n  
9&'I?D&8  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pB @l+ n^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 6{O#!o*g  
C=LXL1x2e  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ,+p&ZpH  
B x(+uNQ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) )p.+39]{2  
{ >M` swEj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Kd_WN;l  
 { )G(6=l*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ^V^In-[!y:  
  SaveBmp(); =hV-E D  
  return FALSE; V/j]UK0$  
 } a S- rng  
 …… //其它处理及默认处理 0Sz&Oguv  
} +uPN+CgQ@  
Z_%}pe39B  
DSwF }  
  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]Zc&&+8{  
$s2-O!P?  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 `1%SXP1  
v}6YbY Tq  
  二、编程步骤 #Id.MLHxA_  
1SBc:!2  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; qa![oMKc  
=N,KVMxw  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y)3(  
MDkIaz\U  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; }9C5U>?  
"X']_:F1a  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; .?SClTqg  
}?P~qJ|1  
  5、 添加代码,编译运行程序。 t\2myR3  
}@'xEx  
三、程序代码 -X@;"0v  
A!v-[AI[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL YtQKsM  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) FV/xp}nz  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ da@y*TO#i  
#if _MSC_VER > 1000 1{ #Xa=  
#pragma once !2x"'o  
#endif // _MSC_VER > 1000 Q6S[sTKR  
#ifndef __AFXWIN_H__ oB[3? e  
#error include 'stdafx.h' before including this file for PCH <$.KCLP  
#endif 4Uz:zB  
#include "resource.h" // main symbols < /y V  
class CHookApp : public CWinApp D<7S P,D  
{  OU=9fw  
 public: $52Te3n  
  CHookApp(); RCt)qh+  
  // Overrides @"9y\1u  
  // ClassWizard generated virtual function overrides e,E;\x &  
  //{{AFX_VIRTUAL(CHookApp) ^a`zvrE v  
 public: Xi5kE'_  
  virtual BOOL InitInstance(); [ hj|8)  
  virtual int ExitInstance(); w8%yX$<  
  //}}AFX_VIRTUAL F *; +-e  
  //{{AFX_MSG(CHookApp) +ZXGT  
  // NOTE - the ClassWizard will add and remove member functions here. hBsjO3n  
  // DO NOT EDIT what you see in these blocks of generated code ! whNRUOK:  
  //}}AFX_MSG ZP)=2'RY  
  DECLARE_MESSAGE_MAP() dh/:H/k kR  
}; (Cp:NS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); M O5fu!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); K! /E0G&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u2<:mu[|P  
BOOL InitHotkey(); Oe9{`~  
BOOL UnInit(); 0jv9N6IM  
#endif z>j%-3_1  
Y tGH>0}h  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. G%YD2<V  
#include "stdafx.h" @6*<Xs =  
#include "hook.h" 17D167\X  
#include <windowsx.h> }sy3M rb  
#ifdef _DEBUG LWbWj ^  
#define new DEBUG_NEW MC#bo{Bq3-  
#undef THIS_FILE |iM*}Ix-  
static char THIS_FILE[] = __FILE__; ?vRz}hiy  
#endif Z-4A`@p  
#define MAX_KEY 100 j~DoMP5Ls  
#define CTRLBIT 0x04 pq5)Ug  
#define ALTBIT 0x02 e;3$7$n Pv  
#define SHIFTBIT 0x01 Lu:!vTRmw  
#pragma data_seg("shareddata") q\#3G  
HHOOK hHook =NULL; @7lZ{jV$  
UINT nHookCount =0; O8u"Y0$*w  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 2|}p&~G(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 8Z3+S)6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey y8+?:=N.  
static int KeyCount =0; lRt8{GFy  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 4)j<(5  
#pragma data_seg() ]^ O<WD  
HINSTANCE hins; ZuS+p0H"  
void VerifyWindow(); 2L<TqC{,-  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ]VJcV.7`  
//{{AFX_MSG_MAP(CHookApp) 4 d]  
// NOTE - the ClassWizard will add and remove mapping macros here. 6%S>~L66  
// DO NOT EDIT what you see in these blocks of generated code! ^ioTd  
//}}AFX_MSG_MAP uFdSD  
END_MESSAGE_MAP() !W$Br\<  
62(WZX%b  
CHookApp::CHookApp() |P?8<8p  
{ wuYo@DDU#  
 // TODO: add construction code here, q/OraPAB  
 // Place all significant initialization in InitInstance cJ8*[H<NV  
} xC;$/u%'  
n; rOH[P  
CHookApp theApp; F$ h/k^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) McsqMI6  
{ * n!0  
 BOOL bProcessed=FALSE; ^|sxbP  
 if(HC_ACTION==nCode) q=nMZVVlF(  
 { 7DYD+N+T  
  if((lParam&0xc0000000)==0xc0000000){// Key up h y[_  
   switch(wParam) DBmcvC  
   { *R~oA`  
    case VK_MENU: *fd` .}  
     MaskBits&=~ALTBIT; E"G. _<3J8  
     break; ?tA- `\E  
    case VK_CONTROL: LnJ7i"Q  
     MaskBits&=~CTRLBIT; &H4UVI  
     break; u|:VQzPd-  
    case VK_SHIFT: #kb(2Td  
     MaskBits&=~SHIFTBIT; !-MG"\#Wq  
     break; 9q8 rf\&  
    default: //judge the key and send message |x5 w;=  
     break; W' 2)$e  
   } S'@"a%EV  
   for(int index=0;index<MAX_KEY;index++){ kT$4X0}  
    if(hCallWnd[index]==NULL) H>7!+&M  
     continue; h,p&/oU4U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 2!6Kzq  
    { y mE`V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); VR:b1XWX  
     bProcessed=TRUE; _ SFD}w3b$  
    } g<lX Xj2  
   } c//W#V2Q  
  } *(k=!`4(  
  else if((lParam&0xc000ffff)==1){ //Key down j_H T  
   switch(wParam) / 9;Pbxn  
   { rRt<kTk!U  
    case VK_MENU: =p7W^/c  
     MaskBits|=ALTBIT; EEo+#  
     break; ah<f&2f  
    case VK_CONTROL: r2Z`4tN:  
     MaskBits|=CTRLBIT; sNZPv^c  
     break; pF !vW  
    case VK_SHIFT: *{Z!m@?  
     MaskBits|=SHIFTBIT; Y zvtxX*  
     break; <1LuYEDq  
    default: //judge the key and send message qnm9L w#  
     break; 3}gK`1Nq1  
   } C4cg,>P7  
   for(int index=0;index<MAX_KEY;index++) PQ(%5c1e  
   { w`v\/a_  
    if(hCallWnd[index]==NULL) AdYQhF##  
     continue; |$w-}$jq5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HZ}'W<N  
    { Ce)Wvuh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); , XR8qi~  
     bProcessed=TRUE; P4AdfHk  
    } $ta#] >{  
   } p}!pT/KmpH  
  } e^an` </{  
  if(!bProcessed){ UCWU|r<s,  
   for(int index=0;index<MAX_KEY;index++){ ropiyT9;  
    if(hCallWnd[index]==NULL) k %rP*b*  
     continue; e/3hb)#;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $.cGRz  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |S}*M<0  
   } VA%i_P,  
  } 0q;] ;m  
 } 7U7 i2 4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); t8+93,*B  
} E,$uN w']  
SYwNx">Bq  
BOOL InitHotkey() g!8lW   
{ )gLasR.1  
 if(hHook!=NULL){ Yt'o#"R)  
  nHookCount++; sg2C_]i,H  
  return TRUE; &ivIv[LV  
 } eC39C2q\  
 else =+L>^w#6=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); R{B~Now3  
  if(hHook!=NULL) U,S286  
   nHookCount++; p[GyQ2k)  
  return (hHook!=NULL); <am7t[G."  
} KAzRFX),  
BOOL UnInit() TDGzXJf[  
{ `ouzeu9}  
 if(nHookCount>1){ c2f$:XiM  
  nHookCount--; &40]sxm  
  return TRUE; b#U%aPH  
 } /km3L7L%R  
 BOOL unhooked = UnhookWindowsHookEx(hHook); *X-$* ~J0  
 if(unhooked==TRUE){ ;CZcY] ol  
  nHookCount=0; BYf"l8^,  
  hHook=NULL; 7EXmmB~>,  
 } /{va<CL  
 return unhooked; /0uinx  
} eH8.O  
jYF3u0 )  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5=986ci$U  
{ AVWrD[ wD2  
 BOOL bAdded=FALSE; IA4(^-9  
 for(int index=0;index<MAX_KEY;index++){ *2MTx   
  if(hCallWnd[index]==0){ w1b <>A?87  
   hCallWnd[index]=hWnd; :<gk~3\  
   HotKey[index]=cKey; GZt] 38V)g  
   HotKeyMask[index]=cMask; D=vq<X'  
   bAdded=TRUE; 2cl~Va=  
   KeyCount++; t} M3F-NZ  
   break; J|IDnCK  
  } do,X{\  
 } Y5CE#&  
 return bAdded; '1 $({{R  
} ]l'ki8  
{@%(0d{n}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >cb gL%  
{ WXU6 J?tIm  
 BOOL bRemoved=FALSE; mg(56)  
 for(int index=0;index<MAX_KEY;index++){ QR'g*Bro  
  if(hCallWnd[index]==hWnd){ kDh(~nfj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +GS=zNw#  
    hCallWnd[index]=NULL; W|e>  
    HotKey[index]=0; ($W 5fbu  
    HotKeyMask[index]=0; gEsR-A!m  
    bRemoved=TRUE; j[cjQ]>~'  
    KeyCount--; gi>_>zStv  
    break; aO%FQ)BT  
   } V1`| j  
  } Qknc.Z}  
 } mN el3J3  
 return bRemoved; )M 0O=Cl1  
} Z(M)2  
!X8R  
void VerifyWindow() u'1=W5$rK  
{ a6E"  
 for(int i=0;i<MAX_KEY;i++){ 1_C6KS  
  if(hCallWnd!=NULL){ ]:s|.C%qI  
   if(!IsWindow(hCallWnd)){ [#Vr)\n  
    hCallWnd=NULL; dCTpO  
    HotKey=0; P0z{R[KBH  
    HotKeyMask=0; T}[vfIJD  
    KeyCount--; *,*qv^  
   } iGk{8Da<  
  } {B.]w9  
 } q?4uH;h:^G  
} A5ID I<a  
Uc0'XPo3I  
BOOL CHookApp::InitInstance() ="R6YL  
{ h';v'"DoW`  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); e&4u^'+K  
 hins=AfxGetInstanceHandle(); CD[=z)<z{  
 InitHotkey(); G\ZRNb  
 return CWinApp::InitInstance(); p9WskYpm  
} vh8Kd' y  
]#.&f]6l  
int CHookApp::ExitInstance() &X,)+ b=  
{ FF~4y>R7u  
 VerifyWindow(); neFno5dj  
 UnInit(); {{%8|+B  
 return CWinApp::ExitInstance(); E}/|Lja  
} b'5pQ2Mq  
{VG[m@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file L0  2~FT  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 7=A9E]:  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ {Y%=/ba W  
#if _MSC_VER > 1000 $yFuaqG`Wo  
#pragma once KocXSh U  
#endif // _MSC_VER > 1000 {WOfT6y+  
G5J ZB7C  
class CCaptureDlg : public CDialog %esZ}U   
{ (1j$*?iGA  
 // Construction M~F2cX W  
 public: SfSEA^@|  
  BOOL bTray; \<x_96jt!\  
  BOOL bRegistered; #@s~V<rW  
  BOOL RegisterHotkey(); <" l;l~Y1  
  UCHAR cKey; wg_CI,Kq  
  UCHAR cMask; t>@3RBEK  
  void DeleteIcon(); d|+jCTKS  
  void AddIcon(); hg'!  
  UINT nCount; 'OW"*b  
  void SaveBmp(); ]u ~Fn2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor QfWu~[  
  // Dialog Data GSnHxs)  
  //{{AFX_DATA(CCaptureDlg) v^_]W3K  
  enum { IDD = IDD_CAPTURE_DIALOG }; Sc 3M#qm_  
  CComboBox m_Key; E(+wl  
  BOOL m_bControl; -0WCwv  
  BOOL m_bAlt; psy(]Pf  
  BOOL m_bShift; Nw& }qSN  
  CString m_Path; W(lKR_pF  
  CString m_Number; oe|<xWu  
  //}}AFX_DATA #n)W  
  // ClassWizard generated virtual function overrides T KL(97)<  
  //{{AFX_VIRTUAL(CCaptureDlg) [mzF)/[_2  
 public: Le:mMd= G  
  virtual BOOL PreTranslateMessage(MSG* pMsg); qq3Qd,$Z  
 protected: R&_\&:4f  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9OT4j Am  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); )TG0m= *  
  //}}AFX_VIRTUAL tF g'RV{  
  // Implementation fA0=Y,pzv  
 protected: JgKZ;GM:W  
  HICON m_hIcon; NV(4wlh)y  
  // Generated message map functions eEGcio}_I9  
  //{{AFX_MSG(CCaptureDlg) ,W8Iabi^  
  virtual BOOL OnInitDialog(); C*6)Ut '  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); y&=19 A#  
  afx_msg void OnPaint(); "M0l;  
  afx_msg HCURSOR OnQueryDragIcon(); k+r9h'd   
  virtual void OnCancel(); cPaWJ+c  
  afx_msg void OnAbout(); lrX0c$)  
  afx_msg void OnBrowse(); 't?7.#,6O  
  afx_msg void OnChange(); ~G:2iSi(#  
 //}}AFX_MSG v[DbhIXU  
 DECLARE_MESSAGE_MAP() *[~o~e/YCb  
}; C5PBfn<j  
#endif nC.2./OwMf  
!v4j`A;%  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =*:_swd  
#include "stdafx.h" !"x7re  
#include "Capture.h" #iU8hUbo  
#include "CaptureDlg.h" ?r E]s!K  
#include <windowsx.h> {$1$]p~3 o  
#pragma comment(lib,"hook.lib") OPt;G,$ta  
#ifdef _DEBUG IgR"eu U  
#define new DEBUG_NEW {AL9o2  
#undef THIS_FILE rbuL@= S@*  
static char THIS_FILE[] = __FILE__; OC>_=i$ '  
#endif A r7mH4M  
#define IDM_SHELL WM_USER+1 Z t+FRR=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); |}p}`Mb)a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~& WN)r'4y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; eGSp(o56  
class CAboutDlg : public CDialog Z*9]:dG:!  
{ , 64t  
 public: ]baaOD$Z  
  CAboutDlg(); ]F* a PV  
  // Dialog Data m_Ac/ct f  
  //{{AFX_DATA(CAboutDlg) Ao,!z  
  enum { IDD = IDD_ABOUTBOX }; O][Nl^dl  
  //}}AFX_DATA i$^B-  
  // ClassWizard generated virtual function overrides Q$h:[_v  
  //{{AFX_VIRTUAL(CAboutDlg) mV*/zWh_  
 protected: 8u'O` j  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -llx:  
  //}}AFX_VIRTUAL t-7U1B}=<C  
  // Implementation @-&(TRbZo  
 protected: wAl}:|+n  
  //{{AFX_MSG(CAboutDlg) uGUv~bE  
  //}}AFX_MSG hKZ`DB4  
  DECLARE_MESSAGE_MAP() ,WB_C\.#XN  
}; Z-h7  
+5t bK  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 7Cd_zZ  
{ X:``{!~geo  
 //{{AFX_DATA_INIT(CAboutDlg) u|OzW}xb7j  
 //}}AFX_DATA_INIT G>w?9:V}  
} ~'NpM#A  
^2C /!Y<  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k8 ;uC~L  
{ ta4JWllf  
 CDialog::DoDataExchange(pDX); (YYj3#|  
 //{{AFX_DATA_MAP(CAboutDlg) 8lWH=kA\  
 //}}AFX_DATA_MAP :9F''f$AP  
} :IVk_[s  
8hKP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6snOMa GRu  
 //{{AFX_MSG_MAP(CAboutDlg) ;w6fM  
 // No message handlers Gl8&FrR  
 //}}AFX_MSG_MAP O%JsUKV  
END_MESSAGE_MAP() EwD3d0udL  
'-PMF~~S  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)  Vp] D  
: CDialog(CCaptureDlg::IDD, pParent) "rx^M*"  
{ FJf~vAQ  
 //{{AFX_DATA_INIT(CCaptureDlg) 46K&$6eN  
  m_bControl = FALSE; sP?$G8-^  
  m_bAlt = FALSE; W[>iJJwz  
  m_bShift = FALSE; )v52y8G-p  
  m_Path = _T("c:\\"); 4j@i%  
  m_Number = _T("0 picture captured."); \/*Nf?;  
  nCount=0; Wyq~:vU.S  
  bRegistered=FALSE; _}e7L7B7g  
  bTray=FALSE; fzS`dL5,W  
 //}}AFX_DATA_INIT mGe|8In  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 GjeUUmr  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Cx+WLD  
} iO*`(s  
&whX*IZ{  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) V@v1a@=W  
{ &v$,pg%-:  
 CDialog::DoDataExchange(pDX); Lvi[*une|  
 //{{AFX_DATA_MAP(CCaptureDlg) ^IVe[P'  
  DDX_Control(pDX, IDC_KEY, m_Key); &@% b?~  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ZMoJ#p(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^KkRF":  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8VP"ydg-U  
  DDX_Text(pDX, IDC_PATH, m_Path); ?L@@;tt  
  DDX_Text(pDX, IDC_NUMBER, m_Number); WDE e$k4.  
 //}}AFX_DATA_MAP !.3R~0b  
} % Cu.u)/+  
WGh. ;-  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wy{\/?~c  
//{{AFX_MSG_MAP(CCaptureDlg) )d +hZ'  
 ON_WM_SYSCOMMAND() U!c]_q  
 ON_WM_PAINT() a#+>w5  
 ON_WM_QUERYDRAGICON() B f5&}2u  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) b4Cfd?'  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) WHUT/:?f  
 ON_BN_CLICKED(ID_CHANGE, OnChange) o3n3URu\  
//}}AFX_MSG_MAP mG831v?  
END_MESSAGE_MAP() $s-9|Lbs`  
S~0JoCeo  
BOOL CCaptureDlg::OnInitDialog() k]?z~p  
{ rQ    
 CDialog::OnInitDialog(); ?&znUoB  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 'lhP!E_)q  
 ASSERT(IDM_ABOUTBOX < 0xF000); \Z)#lF|^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 4!l sk:R  
 if (pSysMenu != NULL) ?fK^&6pI  
 { FXx.$W  
  CString strAboutMenu; q*6q}s3n  
  strAboutMenu.LoadString(IDS_ABOUTBOX); JbE?a[Eg?  
  if (!strAboutMenu.IsEmpty()) )n7|?@5U  
  { |l|_dn  
   pSysMenu->AppendMenu(MF_SEPARATOR); 9W*.lf  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); V43nws "4  
  } 3{<R5wUo"  
 } E'5Ajtw;  
 SetIcon(m_hIcon, TRUE); // Set big icon UvkJ?Bu  
 SetIcon(m_hIcon, FALSE); // Set small icon *Ph]F$ZP  
 m_Key.SetCurSel(0); dG&2,n'f  
 RegisterHotkey(); "~u_\STn <  
 CMenu* pMenu=GetSystemMenu(FALSE); 6*ZU}xT  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); [}>#YPZ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 1~%o}+#-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ,e9CJ~a  
 return TRUE; // return TRUE unless you set the focus to a control u8Y~_)\MA  
} '#v71,  
m CM|&u  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [2Iau1<@  
{ tbq|,"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ko#4z%Yq  
 { z!fdx|PUX  
  CAboutDlg dlgAbout; u(W^Nou/+  
  dlgAbout.DoModal(); YgCc|W3{  
 } $v]T8|h  
 else o2DtCU-A  
 { jFtg.SD  
  CDialog::OnSysCommand(nID, lParam); $#5klA  
 } Bi]D{m9  
} $[,l-[-+  
vXephR'  
void CCaptureDlg::OnPaint() W1v CN31  
{ Fse['O~  
 if (IsIconic()) eY T8$  
 { 9"~9hOEct  
  CPaintDC dc(this); // device context for painting (]2<?x*  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); O -G1})$  
  // Center icon in client rectangle TWUUvj`.  
  int cxIcon = GetSystemMetrics(SM_CXICON); AzZJG v ]H  
  int cyIcon = GetSystemMetrics(SM_CYICON); 1e/L\Y=m  
  CRect rect; l '/N3&5  
  GetClientRect(&rect); 3[VWTq)D=  
  int x = (rect.Width() - cxIcon + 1) / 2; [*<.?9n)or  
  int y = (rect.Height() - cyIcon + 1) / 2; (vKI1^,  
  // Draw the icon  }mKwFVZ  
  dc.DrawIcon(x, y, m_hIcon); $,TGP+vH  
 } :/B:FY=  
 else {VR`;  
 { ( : {"C6x  
  CDialog::OnPaint(); NS@{~;#R  
 } sGSsUO:@j;  
} ,'~ #Ch  
8Jr1_a  
HCURSOR CCaptureDlg::OnQueryDragIcon() ?0{yq>fTu  
{ i^WIr h3a  
 return (HCURSOR) m_hIcon; lzEb5mg  
} >9=:sSQu  
lWbZ=x_0  
void CCaptureDlg::OnCancel() G]4OFz+  
{ ,+se  
 if(bTray) d/S+(<g  
  DeleteIcon(); +semfZ)  
  CDialog::OnCancel(); rj3YTu`  
} 4.8nY\_WF  
{7qA&c=  
void CCaptureDlg::OnAbout() >8|+%pK8<  
{ `fz,Lh*v  
 CAboutDlg dlg; V$(/0mQV(  
 dlg.DoModal(); ,;%yf?  
} i X%[YQ |  
[EgW/\35  
void CCaptureDlg::OnBrowse() g5y;?fqJ  
{ JkU1daTe  
 CString str; r'p =`2=  
 BROWSEINFO bi; 7:TO\0]2n  
 char name[MAX_PATH]; r0\?WoF2C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); '<7S^^ax  
 bi.hwndOwner=GetSafeHwnd(); O}C)~GU  
 bi.pszDisplayName=name; ,^ 7 CP  
 bi.lpszTitle="Select folder"; zie=2  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; < W*xshn  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); # ORO&78  
 if(idl==NULL) !2$ z *C2;  
  return; dCeX}Z  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); e0 u,zg+m  
 str.ReleaseBuffer(); ]9*;;4M g  
 m_Path=str; `XW*kxpm  
 if(str.GetAt(str.GetLength()-1)!='\\') KXf<$\+zO  
  m_Path+="\\"; ^O)ve^P  
 UpdateData(FALSE); J B^Q\;$  
} ^P?vkO"pB?  
WS:5MI,OL  
void CCaptureDlg::SaveBmp() W`rMtzL5  
{ *"cD.)]#2  
 CDC dc; XKqK<!F  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); MS*G-C  
 CBitmap bm; Z19m@vMsIP  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2+.18"rvi  
 int Height=GetSystemMetrics(SM_CYSCREEN); "ZT.k5Z  
 bm.CreateCompatibleBitmap(&dc,Width,Height); _y vLu j  
 CDC tdc; OR4!YVVQ  
 tdc.CreateCompatibleDC(&dc); j)by}}  
 CBitmap*pOld=tdc.SelectObject(&bm); J R$r!hX  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); \~#WY5  
 tdc.SelectObject(pOld); EB!daZH,  
 BITMAP btm; (?3[3 w~  
 bm.GetBitmap(&btm); SdJ/ 4&{ !  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; )DT|(^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 9JnY$e<&  
 BITMAPINFOHEADER bih; =X-Tcj?3g  
 bih.biBitCount=btm.bmBitsPixel; %WGuy@tL  
 bih.biClrImportant=0; ZCYS\E 7X  
 bih.biClrUsed=0; &:3Z.G  
 bih.biCompression=0; _1L(7|^~y[  
 bih.biHeight=btm.bmHeight; so+4B1$)q  
 bih.biPlanes=1; >$H|:{D  
 bih.biSize=sizeof(BITMAPINFOHEADER); `#Kx|x6  
 bih.biSizeImage=size; ^aF8wbuZ  
 bih.biWidth=btm.bmWidth; \?Mf_  
 bih.biXPelsPerMeter=0; [h&BAR/ 2  
 bih.biYPelsPerMeter=0; c*;7yh&%  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); %}&(h/= e  
 static int filecount=0; S&(^<gwl  
 CString name;  ^$-Ye]<  
 name.Format("pict%04d.bmp",filecount++); r?A|d.Tl  
 name=m_Path+name; G[h(xp?,l  
 BITMAPFILEHEADER bfh; A&,,9G<  
 bfh.bfReserved1=bfh.bfReserved2=0; ]|U-y6 45  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ECcZz.  
 bfh.bfSize=54+size; l&W;b6L  
 bfh.bfOffBits=54; y3eHF^K+$  
 CFile bf; >MG(qi  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2(M6(xH>  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); A}5fCx.{  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); "e6|"w@8  
  bf.WriteHuge(lpData,size); iiG f'@/  
  bf.Close(); 8K{[2O7i)  
  nCount++; 1A<,TFg  
 } q; ji w#_  
 GlobalFreePtr(lpData); ~n?>[88"  
 if(nCount==1) (GcT(~Gq)D  
  m_Number.Format("%d picture captured.",nCount); zhblLBpeE\  
 else qAY%nA>jO  
  m_Number.Format("%d pictures captured.",nCount); /nZ;v4  
  UpdateData(FALSE); vq!uD!lr  
} 7dOyxr"H-  
zt=0o| k  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) %Dig)<yx  
{ <>Y?v C  
 if(pMsg -> message == WM_KEYDOWN) &dR=?bz-A  
 { iv&v8;B  
  if(pMsg -> wParam == VK_ESCAPE) q,%:h`t\  
   return TRUE; ?_g1*@pA  
  if(pMsg -> wParam == VK_RETURN) hhI)' $  
   return TRUE; jrMe G.e=D  
 } :+rUBYWx  
 return CDialog::PreTranslateMessage(pMsg); O+~ 7l?o  
} 'ZP)cI:+X  
YB,t0%vTJw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EU-]sTJLF  
{ o)Z=m:t,lK  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ OGO ~f;7  
  SaveBmp(); d s:->+o  
  return FALSE; 9GLb"6+PK  
} [10zTU`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ en*d/>OVJ  
 CMenu pop; o0It82?RN  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); mXzrEI  
 CMenu*pMenu=pop.GetSubMenu(0); ]; Wx  
 pMenu->SetDefaultItem(ID_EXITICON); nBItO~l  
 CPoint pt; -&2B@]]  
 GetCursorPos(&pt); sOU_j:A80;  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); sEc;!L  
 if(id==ID_EXITICON) %~xGkk"I  
  DeleteIcon(); kAA>FI6  
 else if(id==ID_EXIT) H%F>@(U  
  OnCancel(); :G5uocVk  
 return FALSE; \e3`/D  
} qk/:A+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %G3(,Qz  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) je/!{(  
 AddIcon(); O,@~L$a:YZ  
 return res; I=DxRgt  
} 7q =G&e7  
@A<PkpNL  
void CCaptureDlg::AddIcon() tw=oH9c80  
{ g\SrO {*  
 NOTIFYICONDATA data; ,XkGe   
 data.cbSize=sizeof(NOTIFYICONDATA); 5ETip'<KT6  
 CString tip; @`36ku  
 tip.LoadString(IDS_ICONTIP); 4qi[r)G  
 data.hIcon=GetIcon(0); [K/m  
 data.hWnd=GetSafeHwnd(); tWeFEVg  
 strcpy(data.szTip,tip); 0\9K3  
 data.uCallbackMessage=IDM_SHELL; o=J9  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }J:+{4Yn  
 data.uID=98; 5N[9 vW  
 Shell_NotifyIcon(NIM_ADD,&data); Z;l`YK^-  
 ShowWindow(SW_HIDE); Ev"|FTI/  
 bTray=TRUE; _ *f  
} ``VW;l{  
k^"bLf(4  
void CCaptureDlg::DeleteIcon() \!]hU%Un  
{ kX`[Y@nUN  
 NOTIFYICONDATA data; j=?'4sF  
 data.cbSize=sizeof(NOTIFYICONDATA); SMH<'F7i  
 data.hWnd=GetSafeHwnd(); 2 {Vcb  
 data.uID=98; M$4[)6Y  
 Shell_NotifyIcon(NIM_DELETE,&data); }Z-Z|G)#  
 ShowWindow(SW_SHOW); < 0M:"^f  
 SetForegroundWindow(); $Fkaa<9;P  
 ShowWindow(SW_SHOWNORMAL); .iMN,+qP  
 bTray=FALSE; d?AlI  
} Sq\(pfv o  
NEt1[2X%  
void CCaptureDlg::OnChange() 2 dp>Z",  
{ wr(*?p]R  
 RegisterHotkey(); =Z=o#46JY  
} a, Q#Dk  
BVsD( @lX  
BOOL CCaptureDlg::RegisterHotkey() fA/m1bYxg  
{ (Rt7%{*  
 UpdateData(); o2z]dTJ}o  
 UCHAR mask=0; [u}(57DS  
 UCHAR key=0; 2%RNq<{Z_  
 if(m_bControl) zmj"fN{\  
  mask|=4; t\P<X^d%  
 if(m_bAlt) *Xo]-cKL0  
  mask|=2; (+uj1z^  
 if(m_bShift) tGA :[SP  
  mask|=1; [r+ZE7$2b"  
  key=Key_Table[m_Key.GetCurSel()]; 0:0NXVYs&  
 if(bRegistered){ uiq^|5Z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); qyC=(v  
  bRegistered=FALSE; 'r1LSht'  
 } !`1'2BC  
 cMask=mask; 8r"+bhGx~  
 cKey=key; xx{!3 F  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); bXUy9 -L  
 return bRegistered; p G1WXbqW  
} m,C1J%{^  
lif&@o f  
  四、小结 FR2= las"z  
\^I>Q _LU  
  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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