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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: ~PT( /L  
  ]JeA29   
  一、实现方法 cTKj1)!z?X  
NhxTSyT"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: -Kj^ l3w  
su}> >07  
#pragma data_seg("shareddata") Ld[zOx  
HHOOK hHook =NULL; //钩子句柄 ;[-dth  
UINT nHookCount =0; //挂接的程序数目 <Gy)|qpK[  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 yIwAJl7Xf  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Rld1pX2v  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %Ot22a  
static int KeyCount =0; i#t)tM"  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 AepAlnI@  
#pragma data_seg() -d+q+l>0  
blcd]7nK  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 D>u1ngu  
slV+2b  
  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: ^D(N_va<  
-{i;!XE$SR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR G"bItdb  
cKey,UCHAR cMask) NhyVX%qt:  
{ T`f6`1x  
 BOOL bAdded=FALSE; y K~;LV  
 for(int index=0;index<MAX_KEY;index++){ dnVl;L8L3  
  if(hCallWnd[index]==0){ uI7 d?s  
   hCallWnd[index]=hWnd; CPVR  
   HotKey[index]=cKey; [XWY-q#Gg  
   HotKeyMask[index]=cMask; #`5{?2gS9  
   bAdded=TRUE; ve2GRTO^aC  
   KeyCount++; s+>VqyHgf  
   break; MR/jM@8  
  } TC1#2nE&T  
 } D!kv+<+  
 return bAdded; %  (R10G  
} q1sK:)Hu+  
//删除热键 $v?+X20  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) woJO0hHR  
{ 6LRI~*F=3  
 BOOL bRemoved=FALSE;  E%\jR  
 for(int index=0;index<MAX_KEY;index++){ Q}~of}h/  
  if(hCallWnd[index]==hWnd){ wkK61a h6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3Xgf=yG:M  
    hCallWnd[index]=NULL; 8;YeEW 5  
    HotKey[index]=0; W-:gU!{*#  
    HotKeyMask[index]=0; 60P^aj$V  
    bRemoved=TRUE; N"MuAUB:K  
    KeyCount--; sZ #Ck"n  
    break; jy`jxOoG~Z  
   } jA R@?X  
  } "h'0&ZP~_  
 } W!pLk/|ls  
 return bRemoved; S~fQ8t70  
} @BWroNg{  
1J<Wth{  
deSrs:.  
  DLL中的钩子函数如下: elCDPZTf  
}:C4T*|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;o]'7qGb  
{ ; mF-y,E  
 BOOL bProcessed=FALSE; *(@(9]B~  
 if(HC_ACTION==nCode) `2\vDy1,j  
 { sJ)XoK syW  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Z-;<R$  
   switch(wParam) WbC|2!  
   {  PV vNu5k  
    case VK_MENU: =,&PD(.  
     MaskBits&=~ALTBIT; R'f|1mt  
     break; $wUFHEl  
    case VK_CONTROL: iEr Y2~?  
     MaskBits&=~CTRLBIT; PeGL Rbx34  
     break; mw)KyU#l,:  
    case VK_SHIFT: <wUDcF  
     MaskBits&=~SHIFTBIT; 62K7afH  
     break; ,-^Grmr4M  
    default: //judge the key and send message !a?$  
     break; rLO1Sv  
   } @ qWgokf  
   for(int index=0;index<MAX_KEY;index++){ w1B!z  
    if(hCallWnd[index]==NULL) ?WE#%W7U  
     continue; <4S Y'-w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T!e ]=  
    { R{GOlxKs C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @~% R%Vu  
     bProcessed=TRUE; fH? e9E4l  
    } DdDO.@-Z  
   } eAN]*: ]g  
  } OW1i{  
  else if((lParam&0xc000ffff)==1){ //有键按下 Cm g(# $ X  
   switch(wParam) X@KF}x's  
   { h<2o5c|  
    case VK_MENU: ?t++IEoP  
     MaskBits|=ALTBIT; eS(\E0%QI  
     break; {/`iZzPg  
    case VK_CONTROL: mne4uW  
     MaskBits|=CTRLBIT; >+y[HTf-  
     break; N9hs<b+N_  
    case VK_SHIFT: N>##} i  
     MaskBits|=SHIFTBIT; i[1K~yXq:  
     break; vw VeHjR  
    default: //judge the key and send message Oz(0$c  
     break; FJo  ?~  
   } x0 1n  
   for(int index=0;index<MAX_KEY;index++){ %+gYZv-  
    if(hCallWnd[index]==NULL) i]&C=X  
     continue; xl [3*K   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  >d-By  
    { <[mT*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 5(RFk Zn4[  
     bProcessed=TRUE; +(n&>7 5  
    } n{sF'n</  
   } ,aOi:aaZRT  
  } CT5\8C  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 IzVb  
   for(int index=0;index<MAX_KEY;index++){ 3z7SK Gy  
    if(hCallWnd[index]==NULL) vN#?>aL  
     continue; kT6h}d^/^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) `-@8IZ7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N$>.V7H&  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 3 RB+  
   } ,z<J`n  
  } SFhi]48&V  
 } UrtA]pc3L  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <u "xHl8Io  
} #dy z  
"#zSk=52z  
  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: qTc-Z5  
&b :u~puM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); A|jmp~@K)+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h r@c7/L  
Hq<Sg4nz  
  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: ogD 8qrZ6J  
bO8>w9MF  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D{'>G@nLQ  
{ iCd$gwA>F  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) k;EG28   
 { _0HCtx ;  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 scr`] tD  
  SaveBmp(); : jgvg$fd  
  return FALSE; Iv,Ub_Ll9  
 } LPuc&8lGWf  
 …… //其它处理及默认处理 [l~Gwaul>  
} (]c M ;  
_#f+@)vR  
{7EnM1]  
  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。 ".0~@W0  
$a / jfpV  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Cu2eMUGt  
Z]L_{=*  
  二、编程步骤 k&JB,d-mJ%  
XFj\H(D  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; W^(:\IvV  
+V2\hq[{  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; zY11.!2  
FJI%+$]  
  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; (w1M\yodV  
<n#phU Q  
  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; %R|_o<(#MJ  
x6n(BMr  
  5、 添加代码,编译运行程序。 G`;YB  
jRn5)u  
三、程序代码 )Z/L  
*|Bu7nwg  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL W't?aj I|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Q4H(JD1f)  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ g$^:2MT"aQ  
#if _MSC_VER > 1000 /m"#uC!\  
#pragma once _ ^2\/@  
#endif // _MSC_VER > 1000 m2{DLw".  
#ifndef __AFXWIN_H__ ;nSOe AF)Q  
#error include 'stdafx.h' before including this file for PCH ^i"~6QYE  
#endif 1QA{NAnu&  
#include "resource.h" // main symbols V(6*wQ`&  
class CHookApp : public CWinApp l-v(~u7  
{ qj.>4d  
 public: 8*bEsc|  
  CHookApp(); B2kKEMdGg  
  // Overrides hx.ln6=4  
  // ClassWizard generated virtual function overrides -%G}T}"_  
  //{{AFX_VIRTUAL(CHookApp) _o+z#Fnz  
 public: Z[Z3x6 6  
  virtual BOOL InitInstance(); 0[ BPmO6  
  virtual int ExitInstance(); [X&VxTxr  
  //}}AFX_VIRTUAL j@o \d%.'!  
  //{{AFX_MSG(CHookApp) sw\O\%^  
  // NOTE - the ClassWizard will add and remove member functions here. xHpB/P~  
  // DO NOT EDIT what you see in these blocks of generated code ! zbL8 pp  
  //}}AFX_MSG <Pnz$nH:e  
  DECLARE_MESSAGE_MAP() c e\|eN[  
}; [6u8EP0xM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2uEvu  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @ L=dcO{r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k|r|*|8  
BOOL InitHotkey(); S|Yz5)*  
BOOL UnInit(); /\wm/Yx?S  
#endif {/2 _"H3:  
K;'s+ZD  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1w$X;q"  
#include "stdafx.h" sQ aP:@  
#include "hook.h" P$H9  
#include <windowsx.h> =U`9_]~1c@  
#ifdef _DEBUG \1MMz Z4rf  
#define new DEBUG_NEW = lMs1}S9  
#undef THIS_FILE [B1h0IR  
static char THIS_FILE[] = __FILE__; 6mml96(  
#endif x!`~+f.6  
#define MAX_KEY 100 K)&oDwk  
#define CTRLBIT 0x04 sMDHg  
#define ALTBIT 0x02 rk)h_zN  
#define SHIFTBIT 0x01 Y7GHIzX  
#pragma data_seg("shareddata") +\s&v!  
HHOOK hHook =NULL; OaF[t*]D3  
UINT nHookCount =0; u}(K3H3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey @UwDsx&2(t  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +'ADN!(B_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey m IYM+2p  
static int KeyCount =0; ,@Aeo9}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift i7jI(VvB^  
#pragma data_seg() /DE`>eJY  
HINSTANCE hins; 1MYA/l$  
void VerifyWindow(); zi?G wh~  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) NA{?DSP  
//{{AFX_MSG_MAP(CHookApp) X775j"<d  
// NOTE - the ClassWizard will add and remove mapping macros here. RA ER\9i  
// DO NOT EDIT what you see in these blocks of generated code! i}e4P>ADD  
//}}AFX_MSG_MAP Scz/2vNi`  
END_MESSAGE_MAP() 586lN22xM  
z$b'y;k  
CHookApp::CHookApp() 17) `CM$<[  
{ =&x u"V  
 // TODO: add construction code here, b3^d!#KVM  
 // Place all significant initialization in InitInstance "3e1 7dsY  
} IRY/0v  
Tq,xW  
CHookApp theApp; jlb=]hp8%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) bVW2Tjc:  
{ aC,?FWm  
 BOOL bProcessed=FALSE; :#nv:~2]  
 if(HC_ACTION==nCode) K<~J*k<v  
 { Tp&7CNl|  
  if((lParam&0xc0000000)==0xc0000000){// Key up /PTk296@  
   switch(wParam) P{[@t_  
   { rpM jDjW  
    case VK_MENU: yl UkVr   
     MaskBits&=~ALTBIT; S E0&CV4  
     break; ^M7pCetjdW  
    case VK_CONTROL: ' "I-! +  
     MaskBits&=~CTRLBIT; U#' WP  
     break; "S^ ""5  
    case VK_SHIFT: lL6W:Fq@(  
     MaskBits&=~SHIFTBIT;  Mcm%G#  
     break; 344E4F"ph  
    default: //judge the key and send message 0.!!rq,  
     break; "C'T>^qw*  
   } D{G~7P\.  
   for(int index=0;index<MAX_KEY;index++){ {"n=t`E)3  
    if(hCallWnd[index]==NULL) x) OJ?l  
     continue; 4>}qdR1L4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CI+@G XY  
    { "c*&~GSE4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;wKsi_``@  
     bProcessed=TRUE; wgFAPZr  
    } tVqc!][   
   } rJUXIV>z  
  } y_}jf,b4  
  else if((lParam&0xc000ffff)==1){ //Key down Gf\u%S!%  
   switch(wParam) iJVm=0WS^  
   { qJq!0F  
    case VK_MENU: " 'TEBkj|u  
     MaskBits|=ALTBIT; %h "%G=:  
     break; ObEp0-^?  
    case VK_CONTROL: W'}^m*F  
     MaskBits|=CTRLBIT; Dh.pH1ZY3n  
     break; C*&FApG  
    case VK_SHIFT: k\A[p\  
     MaskBits|=SHIFTBIT; %IH ra6  
     break; .j^=]3  
    default: //judge the key and send message E%vT(Kz  
     break; Dx>~^ ^<  
   } U~s-'-C /  
   for(int index=0;index<MAX_KEY;index++) -$tf`   
   { H0?Vq8I?  
    if(hCallWnd[index]==NULL) {mmQv~|5q  
     continue; ?i5=sK\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zg/ ],/`  
    { OoOr@5g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x}X hL  
     bProcessed=TRUE; \>p\~[cxt  
    } KxUO=v<u  
   } K\y W{y1  
  } "d c- !  
  if(!bProcessed){ j5V{,lf  
   for(int index=0;index<MAX_KEY;index++){ EJaGz\\  
    if(hCallWnd[index]==NULL) S/)yi  
     continue; ;QqC c!b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }E&48$0h  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N`rz>6,k1  
   } $i"IOp  
  } !G~`5?CvE  
 } @JU Xp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); W:V.\  
} e(Y5OTus  
yLEA bd%+  
BOOL InitHotkey() H.#zbKj  
{ _l{_n2D-  
 if(hHook!=NULL){ Wz)@k2  
  nHookCount++; 2"8qtG`Et  
  return TRUE; KSxZ4Y  
 } |0xP'(  
 else @ w?,7i-S  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); @:K={AIa  
  if(hHook!=NULL) }Wz[ox9b  
   nHookCount++; ]@ N::!m  
  return (hHook!=NULL); ?#Y1E~N  
} wrAcVR  
BOOL UnInit() P`OZoI$bV  
{ 7[It  
 if(nHookCount>1){ A&L2&ofV&q  
  nHookCount--; !<= ^&\A  
  return TRUE; V*H7m'za  
 } I T gzD"d  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 3h**y %^  
 if(unhooked==TRUE){  [1g   
  nHookCount=0; rH9[x8e  
  hHook=NULL; V~]&1  
 } Nc:0opPM  
 return unhooked; $\q}A:  
} 5~{s-Ms  
Tno 0Q +  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A+ LX37B  
{ XU6SYC"t%~  
 BOOL bAdded=FALSE; wPxtQv  
 for(int index=0;index<MAX_KEY;index++){ 9F2MCqvcm  
  if(hCallWnd[index]==0){ m4,inA:o  
   hCallWnd[index]=hWnd; )uC5  
   HotKey[index]=cKey; [ ]42$5eof  
   HotKeyMask[index]=cMask; %6E:SI 4  
   bAdded=TRUE; 5v"Sv  
   KeyCount++; <8BNqbX  
   break; CtE <9?  
  } `qhZZ{s)1U  
 } :|\)=4  
 return bAdded; ky I~  
} _[,7DA.qc  
1ZO/R%[  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Mi047-% (  
{ ZG8Xr "  
 BOOL bRemoved=FALSE; Uf#9y182*c  
 for(int index=0;index<MAX_KEY;index++){ zj 2l&)N  
  if(hCallWnd[index]==hWnd){ c|Fu6LF a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ LTcZdQd$  
    hCallWnd[index]=NULL; "=!sZO?3  
    HotKey[index]=0; 4ZtsLMwLD  
    HotKeyMask[index]=0; )wCV]TdF  
    bRemoved=TRUE; ?wREX[Tqs  
    KeyCount--; s^HI%mdf  
    break; qqSFy>`P  
   } tgC)vZ&a  
  } 3]h*6 V1$  
 } qv3% v3\4  
 return bRemoved; n a+P|'6  
} >\[|c  
_*CbtQb5  
void VerifyWindow() Zty9O8g  
{ sE!$3|Q  
 for(int i=0;i<MAX_KEY;i++){ qe|U*K 2_  
  if(hCallWnd!=NULL){ mq+<2 S  
   if(!IsWindow(hCallWnd)){ nIGElt]  
    hCallWnd=NULL; _&aPF/  
    HotKey=0; Lm*PHG  
    HotKeyMask=0; dgT(]H  
    KeyCount--; }70A>JBw  
   } }ZJJqJ`*e  
  } _kdt0Vr,L  
 } iJS7g  
} y#i` i  
F$jfPy-f  
BOOL CHookApp::InitInstance() {_UOS8j7  
{ A+hA'0isF@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 1u~a*lO}  
 hins=AfxGetInstanceHandle(); a?@lX>Z  
 InitHotkey(); X=V2^zrt  
 return CWinApp::InitInstance(); :D~J(Y2  
} !vq|*8  
U\-=|gQ'  
int CHookApp::ExitInstance() J@+b_e*  
{ vF)eo"_s*  
 VerifyWindow(); ,,]<f*N  
 UnInit(); r! ~6.  
 return CWinApp::ExitInstance(); eIQ@){lJ-]  
} tgY/8& $M  
>fzFNcO*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file kAq#cLprG  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) p$mt&,p  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sY:=bU^P  
#if _MSC_VER > 1000 M2I*_pI  
#pragma once TQth"Cv2:  
#endif // _MSC_VER > 1000 \- 8aTF  
j<)`|?@e(  
class CCaptureDlg : public CDialog ~ 1~|/WG  
{ 8`_tnARIX  
 // Construction 6G{ Q@  
 public: gv1y%(`|n(  
  BOOL bTray; }=|plz}  
  BOOL bRegistered; vsJDVJ +=  
  BOOL RegisterHotkey(); 'V\V=yc1  
  UCHAR cKey; 0~ o,^AW  
  UCHAR cMask; *,28@_EwY  
  void DeleteIcon(); [_: GQ  
  void AddIcon(); hii#kB2  
  UINT nCount; Mbn;~tY>  
  void SaveBmp(); @2;cv?i)  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor t%StBq(q  
  // Dialog Data a'A<'(yv  
  //{{AFX_DATA(CCaptureDlg) !+]KxB   
  enum { IDD = IDD_CAPTURE_DIALOG }; sKk+^.K}|  
  CComboBox m_Key; =}YX I  
  BOOL m_bControl; j4u ["O3  
  BOOL m_bAlt; O{ 0it6  
  BOOL m_bShift; Cj$:TWYIh[  
  CString m_Path; <W+9 h0c  
  CString m_Number; 3R-5&!i  
  //}}AFX_DATA P#D|CP/Cu  
  // ClassWizard generated virtual function overrides G#M0 C>n  
  //{{AFX_VIRTUAL(CCaptureDlg) 8H|ac[hXK2  
 public: F)v  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Pm,.[5uc  
 protected: cL][sI  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ci/qm\JI<<  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); D c;k)z=  
  //}}AFX_VIRTUAL jAU&h@  
  // Implementation U`5/tNx  
 protected: t#3 _M=L  
  HICON m_hIcon; fI1 9p Q  
  // Generated message map functions g>k?03;  
  //{{AFX_MSG(CCaptureDlg) k1ja ([Q  
  virtual BOOL OnInitDialog(); (=%0$(S>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -m@PqJF^  
  afx_msg void OnPaint(); 'GT^araz  
  afx_msg HCURSOR OnQueryDragIcon(); *,IK4F6>:  
  virtual void OnCancel(); w`=O '0d  
  afx_msg void OnAbout(); E AZX  
  afx_msg void OnBrowse(); jU* D  
  afx_msg void OnChange(); iJZNSRQJ}r  
 //}}AFX_MSG ?~4x/d%  
 DECLARE_MESSAGE_MAP() ;Rpib[m  
}; U|VL+9#hd  
#endif l1KgPRmEP  
Ie|5,qw E  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file L#uU. U=  
#include "stdafx.h" G]N3OIw&8  
#include "Capture.h" ar6+n^pi0]  
#include "CaptureDlg.h" K&Bbjb_|  
#include <windowsx.h> I "O^.VC  
#pragma comment(lib,"hook.lib") 5bAdF'~  
#ifdef _DEBUG <U1T_fiBoc  
#define new DEBUG_NEW  mC$y*G  
#undef THIS_FILE p)ig~kk`  
static char THIS_FILE[] = __FILE__; ~J&-~<%P}  
#endif J-<_e??  
#define IDM_SHELL WM_USER+1 3Ovx)qKxd  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T!ZjgCY}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); CbC [aVA=  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; i?;#Z Nh  
class CAboutDlg : public CDialog 6lv@4R^u  
{ d&raHF*  
 public: Q?1J<(oq9  
  CAboutDlg(); 7C 0xKF  
  // Dialog Data *1{A'`.=\  
  //{{AFX_DATA(CAboutDlg) .P aDR |!  
  enum { IDD = IDD_ABOUTBOX }; _uLpU4# ?  
  //}}AFX_DATA PA ?2K4  
  // ClassWizard generated virtual function overrides wbrOL(q.m  
  //{{AFX_VIRTUAL(CAboutDlg) U4fv$gV  
 protected: Z4Dx:m-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *$BUow/>  
  //}}AFX_VIRTUAL `;+x\0@<  
  // Implementation 2[ofz}k]r)  
 protected: I`X!M!dB)  
  //{{AFX_MSG(CAboutDlg) gac31,gH  
  //}}AFX_MSG uX3yq<lK"  
  DECLARE_MESSAGE_MAP() cZ|*Zpk  
}; v:QUwW  
7PMz6  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) &)tiO>B^6  
{ Zf3(! a[  
 //{{AFX_DATA_INIT(CAboutDlg) \-pwA j?  
 //}}AFX_DATA_INIT U&1O  
} SyVXXk 0  
gfj_]  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ) hs&?: )  
{ JCn HEH  
 CDialog::DoDataExchange(pDX); npltsK):  
 //{{AFX_DATA_MAP(CAboutDlg) YiO}"  
 //}}AFX_DATA_MAP 2PyuM=(Wt  
} t2)uJN`a$X  
Q4-d|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) (0q`eO2  
 //{{AFX_MSG_MAP(CAboutDlg) s(3u\#P  
 // No message handlers 'Xwv,  
 //}}AFX_MSG_MAP 9;v3 (U+:  
END_MESSAGE_MAP() Ve%ua]qA  
;&=CZ6vH  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) S8dfe~|7:  
: CDialog(CCaptureDlg::IDD, pParent) kE'p=dXx  
{ ]sb?lAxh{  
 //{{AFX_DATA_INIT(CCaptureDlg) aUZ?Ue9l>2  
  m_bControl = FALSE; fVgK6?<8^  
  m_bAlt = FALSE; Db|JR  
  m_bShift = FALSE; [k\VUg:P  
  m_Path = _T("c:\\"); PWl;pBo  
  m_Number = _T("0 picture captured."); RNw#s R  
  nCount=0; |e@1@q(a[]  
  bRegistered=FALSE; siCi+Y  
  bTray=FALSE; ##Pzc~xSn  
 //}}AFX_DATA_INIT KyX2CfW}t  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 eK1l~W%  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); \A\  
} {z_cczJ-  
6O{QmB0KK  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 98R/ ^\  
{ )J@[8 x`  
 CDialog::DoDataExchange(pDX); IrCl\HQN  
 //{{AFX_DATA_MAP(CCaptureDlg) _@XueNU1hS  
  DDX_Control(pDX, IDC_KEY, m_Key); ]@z!r2[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &2  Yo  
  DDX_Check(pDX, IDC_ALT, m_bAlt); jbS@6 * _  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); q[qX O5  
  DDX_Text(pDX, IDC_PATH, m_Path); Zc_F"KJL  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Kn$E{F\  
 //}}AFX_DATA_MAP 83V\O_7j  
} }|Q\@3&  
/7S g/d%c  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) wS|k3^OV%  
//{{AFX_MSG_MAP(CCaptureDlg) l^bak]9 1  
 ON_WM_SYSCOMMAND() Y54yojvV  
 ON_WM_PAINT() {wSz >,  
 ON_WM_QUERYDRAGICON() -2}ons(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) bvB7d` wx  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Adiw@q1&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) '@KH@~OzRS  
//}}AFX_MSG_MAP 8hww({S2  
END_MESSAGE_MAP() u8?$W%eW  
9 AD*  
BOOL CCaptureDlg::OnInitDialog() m\&99-j:@b  
{ |a7Kn/[`,  
 CDialog::OnInitDialog(); ]:F !h2  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); A?n5;mvq#  
 ASSERT(IDM_ABOUTBOX < 0xF000); Q1kM 4Up  
 CMenu* pSysMenu = GetSystemMenu(FALSE); DQu)?Rsk  
 if (pSysMenu != NULL) &$T7eOiZ  
 { ^"iL|3d  
  CString strAboutMenu; nRX'J5Q m<  
  strAboutMenu.LoadString(IDS_ABOUTBOX); k`'*niz  
  if (!strAboutMenu.IsEmpty()) 7;.Iat9gMf  
  { W%&s$b(  
   pSysMenu->AppendMenu(MF_SEPARATOR); I%Z=O=  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); rR{KnM  
  } gE*7[*2?t  
 } /VEK<.,aMv  
 SetIcon(m_hIcon, TRUE); // Set big icon yZoJD{'?Sw  
 SetIcon(m_hIcon, FALSE); // Set small icon ZhRdml4U2  
 m_Key.SetCurSel(0); Ui1s ]R  
 RegisterHotkey(); #Lk~{  
 CMenu* pMenu=GetSystemMenu(FALSE); z'O+B}  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]j*uD317  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); '<e$ c  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9`^(M^|c  
 return TRUE; // return TRUE unless you set the focus to a control ]|K6Z>V  
} qq?o^_^4  
t -}IKrbv  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) DV>;sCMJ %  
{ ]vV)$xMX  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) VH+3o?nrT  
 { BT$Oh4y4  
  CAboutDlg dlgAbout; |S<!'rY  
  dlgAbout.DoModal(); DH i@ujr  
 } \W=Z`w3  
 else Gfy9YH~  
 { P)Oe?z;G?  
  CDialog::OnSysCommand(nID, lParam); 1#fR=*ZM"  
 } 3Tw9Uc\vT  
} 'V <ZmJ2  
~Dw% d;  
void CCaptureDlg::OnPaint() 0pH$Mk Q  
{ 3rJ LLYR  
 if (IsIconic()) tqpi{e  
 { 2#/sIu-L  
  CPaintDC dc(this); // device context for painting ^q%f~m,O<  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4v{Ye,2  
  // Center icon in client rectangle U17=/E  
  int cxIcon = GetSystemMetrics(SM_CXICON); ~,8#\]xR  
  int cyIcon = GetSystemMetrics(SM_CYICON); SD@ 0X[  
  CRect rect; 7:JGrO  
  GetClientRect(&rect); q& KNK  
  int x = (rect.Width() - cxIcon + 1) / 2; S&'s/jB  
  int y = (rect.Height() - cyIcon + 1) / 2; %@ q2  
  // Draw the icon J{XRltI+  
  dc.DrawIcon(x, y, m_hIcon); Ri::Ek3qu  
 } t!B,%,Dp  
 else =`C K`x  
 { #8BI`.t)j  
  CDialog::OnPaint(); hD,|CQ  
 } [;:ocy  
} 4 &:|h  1  
*7L1SjZw  
HCURSOR CCaptureDlg::OnQueryDragIcon() ]xJ. OUJy  
{ +<B"g{dLuX  
 return (HCURSOR) m_hIcon; :gRVa=}=  
} ;Cty"H,  
?UeV5<TewS  
void CCaptureDlg::OnCancel() j*GS')Cm  
{ K&"X7fQ  
 if(bTray) T5:xia>8O  
  DeleteIcon(); I@#IXH?6  
  CDialog::OnCancel(); `ooHABC  
} 6J$I8b#/  
34_ V&8  
void CCaptureDlg::OnAbout() ) <w`:wD  
{ &W `7 b<  
 CAboutDlg dlg; D& &71X '  
 dlg.DoModal(); qHd7C3  
} 3RFU  
Wdj|RKw  
void CCaptureDlg::OnBrowse() (>lH=&%zj  
{ =OTu8_ d0t  
 CString str; {*  w _*  
 BROWSEINFO bi; %8YUK/(|n  
 char name[MAX_PATH]; D$TpT X\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); O]!o|w(  
 bi.hwndOwner=GetSafeHwnd(); E!L_"GW  
 bi.pszDisplayName=name;  ]4K4Nh~  
 bi.lpszTitle="Select folder"; .}(X19R  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 95ix~cH3q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); .%M80X{5~  
 if(idl==NULL) .CW,Td3f!  
  return; Q DKY7"H  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); g\iSc~%?  
 str.ReleaseBuffer(); @_ UI;*V  
 m_Path=str; vM:c70=  
 if(str.GetAt(str.GetLength()-1)!='\\') r!|h3*YA  
  m_Path+="\\"; Pw6%,?lQ  
 UpdateData(FALSE); > -(Zx  
} W?[ C au-  
m5, &;~  
void CCaptureDlg::SaveBmp() Tiimb[|  
{ ]AN%#1++U  
 CDC dc; <vxTfE@>bp  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "x 3C3Zu.;  
 CBitmap bm; k(@W z>aCv  
 int Width=GetSystemMetrics(SM_CXSCREEN); C+dz0u3s  
 int Height=GetSystemMetrics(SM_CYSCREEN); JLg/fB3%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )XoMOz  
 CDC tdc; *V[I&dKq  
 tdc.CreateCompatibleDC(&dc); OXB 5W#$  
 CBitmap*pOld=tdc.SelectObject(&bm); I<Mb /!TQ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gQ<{NQMzvd  
 tdc.SelectObject(pOld); 4RH>i+)pS\  
 BITMAP btm; B^{~,'  
 bm.GetBitmap(&btm); T#vY(d  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; HJd{j,M  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $-s8tc(  
 BITMAPINFOHEADER bih; MIN}5kc<  
 bih.biBitCount=btm.bmBitsPixel; i 8%@4U/ J  
 bih.biClrImportant=0; :% +9y @%  
 bih.biClrUsed=0; o'Y/0hkh  
 bih.biCompression=0; {xICR ~,*  
 bih.biHeight=btm.bmHeight; uh>"TeOi  
 bih.biPlanes=1; ~3%aEj  
 bih.biSize=sizeof(BITMAPINFOHEADER); aEun *V^,  
 bih.biSizeImage=size; 1{1mL-I;  
 bih.biWidth=btm.bmWidth; H wz$zF+R  
 bih.biXPelsPerMeter=0; 0;]VTz?P  
 bih.biYPelsPerMeter=0; y k\/Cf  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); t[AA=  
 static int filecount=0; 43~v1pf{!  
 CString name; <UTO\w%  
 name.Format("pict%04d.bmp",filecount++); 1 qp"D_h  
 name=m_Path+name; E!>MJlA:k6  
 BITMAPFILEHEADER bfh; +k0UVZZX?  
 bfh.bfReserved1=bfh.bfReserved2=0; h${=gSJc  
 bfh.bfType=((WORD)('M'<< 8)|'B'); f'BmIFb#  
 bfh.bfSize=54+size; Gh<#wa['}  
 bfh.bfOffBits=54; BJ5^-|  
 CFile bf; zz8NBO  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xlh<}V tp  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); xU(b:D Z  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); rqKK89fD'  
  bf.WriteHuge(lpData,size); Z4m+GFY  
  bf.Close(); A7T(p7pP  
  nCount++; Qv)DSl  
 } ?=HoU3  
 GlobalFreePtr(lpData); p4 $4;)  
 if(nCount==1) =GiN~$d  
  m_Number.Format("%d picture captured.",nCount); t@iw&> 8z  
 else Y^XZ.R  
  m_Number.Format("%d pictures captured.",nCount); e+?;Dc-SJ\  
  UpdateData(FALSE); r?pN-x$M=  
} Pjq()\/[Z  
Pj5:=d8z(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6H;\Jt  
{ ']Z%6_WF  
 if(pMsg -> message == WM_KEYDOWN) BHU=TK@GR  
 { 6zGeGW  
  if(pMsg -> wParam == VK_ESCAPE) V|/N-3M  
   return TRUE; ]@CXUa,>a  
  if(pMsg -> wParam == VK_RETURN) w BoP&l  
   return TRUE; o?I`n*u"X  
 } J?1Eh14KZ  
 return CDialog::PreTranslateMessage(pMsg); Fu[GQ6{f  
} n- 1  
lXD=uRCI  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $F]*B `  
{ b27t-p8  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ (@=h(u.  
  SaveBmp(); *9`k$'  
  return FALSE; gm1RQ^n,@.  
} VmZDU(M  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ?Iag-g9#=m  
 CMenu pop; ![eipOX  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5JG`FRW!  
 CMenu*pMenu=pop.GetSubMenu(0); 3w/z$bj  
 pMenu->SetDefaultItem(ID_EXITICON); 7_eV.'h  
 CPoint pt; {yMkd4v  
 GetCursorPos(&pt); ZbH_h]1$D  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); iaQFVROu  
 if(id==ID_EXITICON) H)rJ >L  
  DeleteIcon(); ojVN -*5  
 else if(id==ID_EXIT) v7D0E[)~  
  OnCancel(); }Q-Tw,j  
 return FALSE; lGJ&\Lv:  
} V3/OKI\o  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =r&i`L{]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) |_a^+!P  
 AddIcon(); _6]tbni?v  
 return res; `u8(qGg7GF  
} \#gguq?[  
!HXyvyDN  
void CCaptureDlg::AddIcon() v(,YqT>q@U  
{ "J `#  
 NOTIFYICONDATA data; gmOP8.g  
 data.cbSize=sizeof(NOTIFYICONDATA); Xod/GY G  
 CString tip; ,<TJh[TzC6  
 tip.LoadString(IDS_ICONTIP); Ctk1\quz  
 data.hIcon=GetIcon(0);  p.,`3"C1  
 data.hWnd=GetSafeHwnd(); d-I=xpB  
 strcpy(data.szTip,tip); *#GX~3A  
 data.uCallbackMessage=IDM_SHELL; q{!ft9|K\d  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !)`m mr  
 data.uID=98; HLqDI lL  
 Shell_NotifyIcon(NIM_ADD,&data); SN$3cg]z  
 ShowWindow(SW_HIDE); R,-DP/ (im  
 bTray=TRUE; raM{!T:  
} oF s)UR  
OSwum!hzN  
void CCaptureDlg::DeleteIcon() LVy (O9g  
{ O`;o"\P<  
 NOTIFYICONDATA data; (62Sc]  
 data.cbSize=sizeof(NOTIFYICONDATA); l?HC-_Pbh  
 data.hWnd=GetSafeHwnd(); c2PBYFCyC  
 data.uID=98; }'uV{$  
 Shell_NotifyIcon(NIM_DELETE,&data); m-Se-aF  
 ShowWindow(SW_SHOW); 6dRvx;d  
 SetForegroundWindow(); ];QX&";Z  
 ShowWindow(SW_SHOWNORMAL); {$C"yksr  
 bTray=FALSE; FyV $`c$  
} LXRIo2ynuw  
DyRU$U  
void CCaptureDlg::OnChange() =b Q\BY#  
{ :=K+~?  
 RegisterHotkey();  X$_z"t  
} Yr>7c1FZi  
fhro"5/4  
BOOL CCaptureDlg::RegisterHotkey() l^__oam  
{ &E-q(3-  
 UpdateData(); T~d_?UAw$  
 UCHAR mask=0; rW*[sLl3  
 UCHAR key=0; ZD4:'m`T/  
 if(m_bControl) ,fhK  
  mask|=4; nMBF/75  
 if(m_bAlt) tjcsT>  
  mask|=2; ,/dW*B  
 if(m_bShift) t*Z4&Sy^  
  mask|=1; t24.u+O  
  key=Key_Table[m_Key.GetCurSel()]; QF$s([  
 if(bRegistered){ :{ai w?1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); <#)Q.P  
  bRegistered=FALSE; 8,)<,g-/=  
 } )vGxF}I3  
 cMask=mask; +[[^W;<.l  
 cKey=key; w$jSlgUHy)  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "XU)(<p  
 return bRegistered; c7]0 >nU;  
} .cr<.Ov  
$ou/ Fn  
  四、小结 <jh=W9.N_  
FMT_X  
  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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