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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: hy#nK:B  
  m~=VUhPd  
  一、实现方法 s w >B  
$27OrXQ|  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: i,~(_|-r  
rg[#(  
#pragma data_seg("shareddata") +Goh`!$Rj9  
HHOOK hHook =NULL; //钩子句柄 |#t^D.j  
UINT nHookCount =0; //挂接的程序数目 !ckluj  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 IX 6 jb"  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 HrLws95'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey _~1O#*|4  
static int KeyCount =0; Jon3ywd1Y  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 EpACd8Fb  
#pragma data_seg() C+!=C{@7di  
Y[b08{/  
  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。 xv>8rW(Np5  
9`qw,X&AK_  
  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: kn$SG  
Ot=nKdP}D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 9:%')M&Q  
cKey,UCHAR cMask) )X*_oH=  
{ 1)}hzA  
 BOOL bAdded=FALSE; u-.5rH l  
 for(int index=0;index<MAX_KEY;index++){ #Q_Scxf  
  if(hCallWnd[index]==0){ !j  #8zN  
   hCallWnd[index]=hWnd; Qg1kF^=  
   HotKey[index]=cKey; Iw] ylp  
   HotKeyMask[index]=cMask; DI-&P3iGx  
   bAdded=TRUE;  fZap\  
   KeyCount++; =j w?*  
   break; d+h~4'ebv  
  } +`S_Gy  
 } GRj [2I7:  
 return bAdded; 3&[d.,/  
} _W Hi<,-  
//删除热键 V@z/%=PJ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Zl# ';~9W  
{ (O:&RAkk7  
 BOOL bRemoved=FALSE; :`BG/  
 for(int index=0;index<MAX_KEY;index++){ kG4])qxC'  
  if(hCallWnd[index]==hWnd){ j/wQ2"@a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xG4 C 6s  
    hCallWnd[index]=NULL; 2GigeN|1N  
    HotKey[index]=0; :Eg4^,QX  
    HotKeyMask[index]=0; C.u) 2[(  
    bRemoved=TRUE; Tsu\4 cL]  
    KeyCount--; p+nB@fN/  
    break; ae0Mf0<#)  
   } R-iWbLD  
  } }# Ji"e  
 } $WW7,  
 return bRemoved; bB/fU7<{)u  
} R SWw4}  
YuO!Y9iEm  
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  DLL中的钩子函数如下: q2Sc{E>[  
A] 'XC"lS  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) n[a%*i6x  
{ hE,-CIRg  
 BOOL bProcessed=FALSE; ^8ilUu  
 if(HC_ACTION==nCode) ^=-W8aVi>  
 { `P|V&;}K  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 (L1O;~$  
   switch(wParam) /_(l :q^  
   {  =td(}3|D Y  
    case VK_MENU: BG-nf1K(  
     MaskBits&=~ALTBIT; ! _ >/ r  
     break; QUXr#!rPY|  
    case VK_CONTROL: XGnC8Be{4  
     MaskBits&=~CTRLBIT; R6GlQ G  
     break; hR[_1vuIu  
    case VK_SHIFT: ey>tUmt6?  
     MaskBits&=~SHIFTBIT; >"]t4]GVf  
     break; cE,,9M@^  
    default: //judge the key and send message |BbrB[+ v[  
     break; h!Fh@%  
   } xJ\sm8  
   for(int index=0;index<MAX_KEY;index++){ CF_2ez1u0y  
    if(hCallWnd[index]==NULL) rUB67ok*  
     continue; l@<Jp *|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;,KT+!H$  
    { 1OK~*=/4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); XS0NjZW  
     bProcessed=TRUE; M}" KAa  
    } ~ ^~+p  
   } '<C#"2  
  } WH+S d  
  else if((lParam&0xc000ffff)==1){ //有键按下 .,p@ee$q  
   switch(wParam) 'A/{7*,  
   { Co<F<eXe  
    case VK_MENU: {4R;C~E8  
     MaskBits|=ALTBIT; tD,~i"0;  
     break; 51s3hX$  
    case VK_CONTROL: UPuG&A#VV  
     MaskBits|=CTRLBIT; y.Yni*xt/  
     break; !1+!;R@&H>  
    case VK_SHIFT: G>2: WQ/  
     MaskBits|=SHIFTBIT; 'Hq#9?<2M  
     break; tF!C']  
    default: //judge the key and send message gln X C  
     break; ^S(["6OJ(  
   } S }G3ha  
   for(int index=0;index<MAX_KEY;index++){ F B&l|#e  
    if(hCallWnd[index]==NULL) 0)|;uW  
     continue; j4D`Xq2 X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zr!CT5C5  
    { te3\MSv;O  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); y2x)<.cDP  
     bProcessed=TRUE; _cc9+o  
    } wqQrby<  
   } rY=dNK]d  
  } VsRdZ4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 N?%FVF  
   for(int index=0;index<MAX_KEY;index++){ kgFx  
    if(hCallWnd[index]==NULL) _~b]/]|z#N  
     continue; Oimq P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (Vy`u)gG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M ~6k[ew  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Ot!*,%sjQ  
   } VSc)0eyn  
  } Z#_VxA>]v  
 } $olITe"$g  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G9c2kX.Bf  
} rEs Gf+4  
-hO[^^i9  
  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: ='.G,aJ9  
-~=:tn)0  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;u?H#\J,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); hL/  
X&Pj  
  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: c6F8z75U  
\8-PCD  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >Q# !.lH$W  
{ hjoxx F\_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)  gm@%[  
 { wArtg'=X  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 [/eRc  
  SaveBmp(); 'miY"L:| O  
  return FALSE;  .Aa(  
 } _dw6 C2]P  
 …… //其它处理及默认处理 EAnw:yUV(  
} l*4_  
CEb al\R  
@I0[B<,:G  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 [yfi:|n1  
qRA ,-N  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 xcu:'7'K[  
T#G (&0J5  
  二、编程步骤 IWAp  
VTJ,;p_UH  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; %y2 i1^  
{ BDUl3T  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 92D f.xI}  
5Og=`T  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; A^hFRAg4  
hQDZ%>  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; hX sH9R  
VZ$FTM^b8  
  5、 添加代码,编译运行程序。 %N-f9o8  
Mhj.3nN  
三、程序代码 T,Zfz9{n  
y e1hcQ  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL "': u#UdS  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _,9/g^<  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6`hHx=L  
#if _MSC_VER > 1000 o;Ma)/P  
#pragma once 9"mcN3x:\e  
#endif // _MSC_VER > 1000 3eS *U`_  
#ifndef __AFXWIN_H__ #1` lJ  
#error include 'stdafx.h' before including this file for PCH =L?(mNHT  
#endif <gc\ ,P<ru  
#include "resource.h" // main symbols hiA%Tq?  
class CHookApp : public CWinApp B<uUf)t  
{ +zLh<q0  
 public: h4dT N}  
  CHookApp(); WscNjWQ^TD  
  // Overrides 75t5:>"[  
  // ClassWizard generated virtual function overrides h\qM5Qx+Q  
  //{{AFX_VIRTUAL(CHookApp) SPK% ' s  
 public: W"L;8u  
  virtual BOOL InitInstance(); d|(@#*{T]  
  virtual int ExitInstance(); -& \?Q_6  
  //}}AFX_VIRTUAL a8!/V@a  
  //{{AFX_MSG(CHookApp) vT>ki0P_;  
  // NOTE - the ClassWizard will add and remove member functions here. 7IH^5r  
  // DO NOT EDIT what you see in these blocks of generated code ! 3[O;HS3|  
  //}}AFX_MSG %o9;jX  
  DECLARE_MESSAGE_MAP() /SDDCZ`;|c  
}; XT 'v7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); w st)O{4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ir*T ,O 2J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); H+ Y+8   
BOOL InitHotkey(); n9Xssl0  
BOOL UnInit(); Kn<z<>vO  
#endif vg/:q>o  
rG|*74Q]  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. b!Z-HL6  
#include "stdafx.h" l^ aUN  
#include "hook.h" "Gh?hU,WWZ  
#include <windowsx.h> Tp0^dZM+  
#ifdef _DEBUG tag~SG`ov  
#define new DEBUG_NEW /*8Ms`  
#undef THIS_FILE r6*~WM|Sq7  
static char THIS_FILE[] = __FILE__; Z#lZn!EbK  
#endif 4-:TQp(  
#define MAX_KEY 100 s&7,gWy}BE  
#define CTRLBIT 0x04 =5sUpP V(  
#define ALTBIT 0x02 tu6Q7CjW8  
#define SHIFTBIT 0x01 !(EJ.|LH  
#pragma data_seg("shareddata") #YMU}4=:  
HHOOK hHook =NULL; aZMMcd   
UINT nHookCount =0; J~[A8o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey dkRG4 )~g  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT s!d"(K9E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 4d*=gy%  
static int KeyCount =0; Jj$N3UCg7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ch%-Cg~%  
#pragma data_seg() ~~_!&  
HINSTANCE hins; 6mi: %)"  
void VerifyWindow(); [j :]YR  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ?u9JRXj%  
//{{AFX_MSG_MAP(CHookApp) K;wd2/jmJ  
// NOTE - the ClassWizard will add and remove mapping macros here. ZzuEw   
// DO NOT EDIT what you see in these blocks of generated code! @Gj|X>0  
//}}AFX_MSG_MAP MQv2C@K9F  
END_MESSAGE_MAP() Ux Yb[Nbc  
KF[P /cFI  
CHookApp::CHookApp() MH>CCT  
{ /J"U`/ {4  
 // TODO: add construction code here, [z1[4  
 // Place all significant initialization in InitInstance jHxg(]  
}  {u}Lhv  
K 9X0/  
CHookApp theApp; V@xlm h,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Nuw_,-h  
{ Y4 Y;xK"  
 BOOL bProcessed=FALSE; :u7y k@  
 if(HC_ACTION==nCode) uZ-yu|1  
 { 6-@ X  
  if((lParam&0xc0000000)==0xc0000000){// Key up Y!6,ty'  
   switch(wParam) ]~SOGAFW  
   { JPX5Jm()  
    case VK_MENU: *@|EaH/  
     MaskBits&=~ALTBIT; :Sx!jx>W  
     break; :{d?B$  
    case VK_CONTROL: K 0i[D"  
     MaskBits&=~CTRLBIT; D4x~Vk%H  
     break; x*A_1_A  
    case VK_SHIFT: $~V,.RD  
     MaskBits&=~SHIFTBIT; 'ju{j`b  
     break; 0!c^pOq6  
    default: //judge the key and send message qe!\ oh  
     break; S 'jH  
   } 0"~`U.k~M  
   for(int index=0;index<MAX_KEY;index++){ g $\Z-!(  
    if(hCallWnd[index]==NULL) ,rB"ag !  
     continue; 8jE6zS }m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  0~{&  
    { l0m\2Ttf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $~|#Rz%v  
     bProcessed=TRUE; :dtX^IT  
    } Sn\S `D  
   } 7B`,q-x.  
  } y~JCSzpU  
  else if((lParam&0xc000ffff)==1){ //Key down a_UVb'z  
   switch(wParam) k:Iz>3O3]  
   { S0_#h)  
    case VK_MENU: BTwLx-p9t  
     MaskBits|=ALTBIT; m8q3Pp  
     break; 7[wHNJ7)r  
    case VK_CONTROL: A d0dg2Gw  
     MaskBits|=CTRLBIT; qFo'"z`84  
     break; )19As8rL/o  
    case VK_SHIFT: LV'@JFT-  
     MaskBits|=SHIFTBIT; 9Se7 1  
     break; ^ $M@yWX6  
    default: //judge the key and send message HeagT(rN'  
     break; K; 7o+Xr  
   } (LW4z8e#  
   for(int index=0;index<MAX_KEY;index++) 0ivlKe%  
   { ^<8 c`k )e  
    if(hCallWnd[index]==NULL) qsjTo@A  
     continue; m]yt6b4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y~qv 0O6K  
    { KKR@u(+"a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _R!KHi  
     bProcessed=TRUE; x<'(b7{U0  
    } k\T,CZ<  
   } }*{@-v|_R  
  } KWVEAHIn  
  if(!bProcessed){ ;* vVucx  
   for(int index=0;index<MAX_KEY;index++){ zDbjWd  
    if(hCallWnd[index]==NULL) 1sL#XB$@N  
     continue; L~yu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) G:f\wK[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "#H@d+u  
   } [TAW68f'  
  } ,O@x v  
 } AnV\{A^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h 7feZ_  
} Z&hzsJK{m$  
V0Cz!YM_3  
BOOL InitHotkey() b_&;i4[  
{ o#KGENd  
 if(hHook!=NULL){ /P~@__XN  
  nHookCount++; sN^3bfi!i  
  return TRUE; &+?JY|u  
 } @(Mg>.P  
 else \bze-|C  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); r7z8ICX'q  
  if(hHook!=NULL) ,~ D_T  
   nHookCount++; 6N}>@Y5  
  return (hHook!=NULL); `mro2A  
} 8Z TN  
BOOL UnInit() r)P^CZm  
{ ;}!hgyq  
 if(nHookCount>1){ 4J=6A4O5Z  
  nHookCount--; K-&&%Id6R  
  return TRUE; ""[(e0oA  
 } 7 tOOruiC  
 BOOL unhooked = UnhookWindowsHookEx(hHook); |s&jWM$  
 if(unhooked==TRUE){ <$#b3F"I  
  nHookCount=0; (U"Ub;[7  
  hHook=NULL; Y}_J@&:  
 } ?dJ-g~  
 return unhooked; {*VCR  
} )J?Nfi%  
~n:dHK`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~$1Zw&X  
{ -@49Zh2'  
 BOOL bAdded=FALSE; D-8N Da(`  
 for(int index=0;index<MAX_KEY;index++){ P"dWh;I_  
  if(hCallWnd[index]==0){ 5"4O_JQ  
   hCallWnd[index]=hWnd; bT|N Z!V  
   HotKey[index]=cKey; R;9H`L/>  
   HotKeyMask[index]=cMask; hlPZTr=a  
   bAdded=TRUE; 9Foo8e  
   KeyCount++; )D ^.{70N  
   break; XeD9RMT  
  } q2* G86  
 } 2ZMYA=[!  
 return bAdded; W=v4dy]B  
} f\sxx!kt  
wYtL1D(  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `=A*ei5  
{ c+l1#[Dnc  
 BOOL bRemoved=FALSE; P q\m8iS,w  
 for(int index=0;index<MAX_KEY;index++){ Mp:/[%9Fi  
  if(hCallWnd[index]==hWnd){ ?Z-(SC  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !xs. [&u8  
    hCallWnd[index]=NULL; HC0q_%j  
    HotKey[index]=0; aa8xo5tIp  
    HotKeyMask[index]=0; gxEa?QH  
    bRemoved=TRUE; ]C |Zs=5  
    KeyCount--; ng]jpdeA  
    break; MWv_BXQ  
   } {@1C,8n;  
  } OR[6pr@  
 } \Q+9sV 5,[  
 return bRemoved; 808E)  
} ,3_;JT"5  
$x,?+N  
void VerifyWindow() i>!7/o  
{ [6@{^  
 for(int i=0;i<MAX_KEY;i++){ sY4sq5'!  
  if(hCallWnd!=NULL){ %T]NM3|U  
   if(!IsWindow(hCallWnd)){ IwC4fcZX6  
    hCallWnd=NULL; 0be1aY;m&  
    HotKey=0; 8spoDb.S  
    HotKeyMask=0; 2@``=0z  
    KeyCount--; =M"H~;f]  
   } v,Lv4)  
  } P-9[,3Zd  
 } 3$Ew55  
} "(y",!U@  
-TKS`,#  
BOOL CHookApp::InitInstance() 70p1&Y7or  
{ 8X=cGYC#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); TRwlUC3hQ  
 hins=AfxGetInstanceHandle(); k0IW,z%  
 InitHotkey(); 1:<=zqh0  
 return CWinApp::InitInstance(); 4`F(RweGx  
} >$=-0?.  
:'aT 4  
int CHookApp::ExitInstance() .Ap-<FB  
{ 5~T`R~Uqb  
 VerifyWindow(); BKDs3?&  
 UnInit(); Qmxe*@{`  
 return CWinApp::ExitInstance(); 70,V>=aJ  
} Dm=t`_DL8  
ea3;1-b:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  Ad)Po  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) C3kxw1*   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ m,nZrap  
#if _MSC_VER > 1000 _{CMWo"l  
#pragma once |cpBoU  
#endif // _MSC_VER > 1000  ,lX5-1H  
VuqN)CE^Uq  
class CCaptureDlg : public CDialog OU;R;=/]  
{ >$,A [|R  
 // Construction &V7@ TZ  
 public: 8<(qN> R  
  BOOL bTray; ' N$hbl  
  BOOL bRegistered; q[4{Xh  
  BOOL RegisterHotkey(); \F]X!#&+  
  UCHAR cKey; )(~s-x^\z@  
  UCHAR cMask; o JC-?  
  void DeleteIcon(); m(QGP\Ya  
  void AddIcon(); :0,q>w  
  UINT nCount; ( zQ)EHRD  
  void SaveBmp(); [:gPp)f,  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor [r'PGx  
  // Dialog Data Y1a[HF^-  
  //{{AFX_DATA(CCaptureDlg) ,bT|:T@ny  
  enum { IDD = IDD_CAPTURE_DIALOG }; M,]C(f>  
  CComboBox m_Key; J2cqnwUV  
  BOOL m_bControl; Wz)O,X^  
  BOOL m_bAlt; 0yW#).D^b  
  BOOL m_bShift; n:JWu0,h  
  CString m_Path; cW B>  
  CString m_Number; $0WO 4C%M  
  //}}AFX_DATA TWF6YAQ m  
  // ClassWizard generated virtual function overrides ,at"Q$)T  
  //{{AFX_VIRTUAL(CCaptureDlg) n< UuVu  
 public: 5wM*(H^c[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); juQ&v>9W)  
 protected: IC&xL9  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RUcpdeo  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5/j7C>  
  //}}AFX_VIRTUAL hwF9LD~^  
  // Implementation UhuEE  
 protected: 3nb&Z_/e  
  HICON m_hIcon; VW^6qf/,  
  // Generated message map functions ConXP\M-  
  //{{AFX_MSG(CCaptureDlg) y,{=*2Yt  
  virtual BOOL OnInitDialog(); _@I8B  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); C Z8Fe$F  
  afx_msg void OnPaint(); lSv?!2  
  afx_msg HCURSOR OnQueryDragIcon(); 2E~WcB  
  virtual void OnCancel(); W.OcmA>x  
  afx_msg void OnAbout(); 5W/!o&x~7  
  afx_msg void OnBrowse(); _`yd"0 Ux  
  afx_msg void OnChange();  pME17 af  
 //}}AFX_MSG ,|hM`<"?  
 DECLARE_MESSAGE_MAP() ,lK=m~  
}; e?W-vi%  
#endif '<N^u@tF7  
4W7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i#/,Q1yEn  
#include "stdafx.h" 2NS(;tBB0  
#include "Capture.h" ACQc 0:q  
#include "CaptureDlg.h" RlH|G  
#include <windowsx.h> *?|LE C  
#pragma comment(lib,"hook.lib") \]Nlka  
#ifdef _DEBUG VC%{qal;q  
#define new DEBUG_NEW ~R7F[R  
#undef THIS_FILE oRl~x^[%[-  
static char THIS_FILE[] = __FILE__; [JAHPy=+w  
#endif >TSPEvWc  
#define IDM_SHELL WM_USER+1 eF]`?AeWQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P{ YUW~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GE;S5 X]X  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; H#pl&/+  
class CAboutDlg : public CDialog g)7~vm2/,  
{ nx #0*r}5  
 public: NQQ+l0txI  
  CAboutDlg(); V +#Sb  
  // Dialog Data zTtn`j$  
  //{{AFX_DATA(CAboutDlg) Tb~|p_;o  
  enum { IDD = IDD_ABOUTBOX }; (,Zy 2wr=  
  //}}AFX_DATA y/}[S@4uB  
  // ClassWizard generated virtual function overrides W\mj?R   
  //{{AFX_VIRTUAL(CAboutDlg) N ]KS\  
 protected: I'&#pOB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <a9<rF =r  
  //}}AFX_VIRTUAL L%G/%*7;c  
  // Implementation VyQ@. Lm  
 protected: H CKD0xx  
  //{{AFX_MSG(CAboutDlg) ;Du+C%  
  //}}AFX_MSG ? yL3XB>  
  DECLARE_MESSAGE_MAP() T(LqR?xOo  
}; !|!k9~v!  
^PwZP;On  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #_]/Mr1  
{ '@4M yg* b  
 //{{AFX_DATA_INIT(CAboutDlg) Hh^EMQk  
 //}}AFX_DATA_INIT S0,q@LV  
} !*2cK>`  
K%NNw7\A  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ZL!,s#  
{ YU=Q`y[k  
 CDialog::DoDataExchange(pDX); >R9Q|   
 //{{AFX_DATA_MAP(CAboutDlg) +tsF.Is!t  
 //}}AFX_DATA_MAP _5<d'fBd  
} R]{zGFnx  
\o-9~C\c*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) r\#_b4-v3h  
 //{{AFX_MSG_MAP(CAboutDlg) ZJL8"(/R  
 // No message handlers -Jqm0)2  
 //}}AFX_MSG_MAP Q;9-aZ.H  
END_MESSAGE_MAP() &(M][Uo{|'  
tK@|sZ>3\  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "*08?KA  
: CDialog(CCaptureDlg::IDD, pParent) %6A."sePO  
{ <( "M;C3y  
 //{{AFX_DATA_INIT(CCaptureDlg) Hzm<KQ g  
  m_bControl = FALSE; ?D 8<}~Do  
  m_bAlt = FALSE; EPEy60Rx5  
  m_bShift = FALSE; GnAG'.t-Z  
  m_Path = _T("c:\\"); Eb 8vnB#  
  m_Number = _T("0 picture captured."); hw2'.}B"(  
  nCount=0; #vwK6'z  
  bRegistered=FALSE; ?vA)F)MS   
  bTray=FALSE; @#HB6B  
 //}}AFX_DATA_INIT 9jwcO)p^  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ej_>*^b  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); G6W_)YL  
} }s+ t*z  
ibzcO,c  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) y]3`U UvXD  
{ _H{6{!=y  
 CDialog::DoDataExchange(pDX); &xhwx>C`K  
 //{{AFX_DATA_MAP(CCaptureDlg) p\;\hHai  
  DDX_Control(pDX, IDC_KEY, m_Key); jl-2)<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Whoqs_Mm{  
  DDX_Check(pDX, IDC_ALT, m_bAlt); qV;E% XkkS  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); EC9bCd-z  
  DDX_Text(pDX, IDC_PATH, m_Path); #@pgB:~lB  
  DDX_Text(pDX, IDC_NUMBER, m_Number); b#uNdq3  
 //}}AFX_DATA_MAP n*gr(S  
} RIC\f_Dv  
6XP>qI,AJ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "0*yD[2  
//{{AFX_MSG_MAP(CCaptureDlg) w!/\dqjv  
 ON_WM_SYSCOMMAND() ^$FNu~|K  
 ON_WM_PAINT() I |PEC-(  
 ON_WM_QUERYDRAGICON() vR"?XqgZ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) $7bLw)7  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) W D/\f$4  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 7pllzy  
//}}AFX_MSG_MAP s=S9y7i(R  
END_MESSAGE_MAP() q?R^~r  
G3.*fSY$.<  
BOOL CCaptureDlg::OnInitDialog() 9f(0 qa  
{ DB~3(r?K  
 CDialog::OnInitDialog(); +N6IdDN3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bk(q8xR`  
 ASSERT(IDM_ABOUTBOX < 0xF000); L/J1;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); k kZ2Jxvx  
 if (pSysMenu != NULL) rCK   
 { %>p[;>jW  
  CString strAboutMenu; G_m$?0\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]!c59%f=  
  if (!strAboutMenu.IsEmpty()) r5RUgt  
  { J# >)+  
   pSysMenu->AppendMenu(MF_SEPARATOR); "*U0xnI  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); hqXp>.W  
  } g 2LY~  
 } 2Kkm-#p7  
 SetIcon(m_hIcon, TRUE); // Set big icon !Y8+ Z&^2  
 SetIcon(m_hIcon, FALSE); // Set small icon ^4 MJ  
 m_Key.SetCurSel(0); -(dtAo6  
 RegisterHotkey(); Wtwo1pp  
 CMenu* pMenu=GetSystemMenu(FALSE); pD@:]VP  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); | 2Vhj<6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f]pHJVgFV  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); AX%N:)_$|  
 return TRUE; // return TRUE unless you set the focus to a control m&P B5s\=  
} P,Z K  
%K`th&331  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) bIWSNNV0F  
{ Z bW!c1s{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bcR";cE  
 { adcH3rV  
  CAboutDlg dlgAbout; A`B>fI  
  dlgAbout.DoModal(); U F&B7r  
 } 0&~ JC>S  
 else 6%a9%Is!O  
 { -Qy@-s $  
  CDialog::OnSysCommand(nID, lParam); H|Y*TI2vf8  
 } U#iGR5&^3  
} &ir|2"HV  
+`J~c|(  
void CCaptureDlg::OnPaint() [+F6C  
{ dEhFuNO<2  
 if (IsIconic()) 0$qK: ze  
 { dfA2G<Uc  
  CPaintDC dc(this); // device context for painting Bq5-L}z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /n2qW.qJ>  
  // Center icon in client rectangle n2(`O^yd7C  
  int cxIcon = GetSystemMetrics(SM_CXICON); ]')  
  int cyIcon = GetSystemMetrics(SM_CYICON); Y|l&mK?  
  CRect rect; ;b5^) S  
  GetClientRect(&rect); .GSK!1{@  
  int x = (rect.Width() - cxIcon + 1) / 2; 8I}ATc  
  int y = (rect.Height() - cyIcon + 1) / 2; Zv0'OX~8i  
  // Draw the icon {'-^CoR  
  dc.DrawIcon(x, y, m_hIcon); %{|67h  
 } zH13 ~\  
 else 6Y%{ YQ}s|  
 { 2@6Qifxd@  
  CDialog::OnPaint(); Ueu~803~  
 } 1`sTGNo  
} ,bxGd!&{Q  
4Uk\hgT0  
HCURSOR CCaptureDlg::OnQueryDragIcon() z j F'CY  
{ ZBk br  
 return (HCURSOR) m_hIcon; aI\:7  
} {UFs1  
*`_ 2uBz  
void CCaptureDlg::OnCancel() 6J]8BHJn+  
{ ?$Dc>  
 if(bTray) jK]An;l{Z  
  DeleteIcon(); p[K!.vOt+  
  CDialog::OnCancel(); tZ.hSDH  
} N}ugI`:  
?{;7\1 [4  
void CCaptureDlg::OnAbout() IkuE|  
{ v@d]*TG  
 CAboutDlg dlg; <^w4+5sT/  
 dlg.DoModal(); ;04< 9i  
} ,_UTeW6M  
uC! dy  
void CCaptureDlg::OnBrowse() `J$7X  
{ M1q_gHA  
 CString str; #Y0ru9  
 BROWSEINFO bi; 6u9?  
 char name[MAX_PATH]; `< 82"cAT{  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); hK UK#xx  
 bi.hwndOwner=GetSafeHwnd(); ?sW}<8\  
 bi.pszDisplayName=name; [VE>{4]W  
 bi.lpszTitle="Select folder"; (@Kc(>(: Y  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; p=[SDk`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); m@W>ku  
 if(idl==NULL) Eq=j+ch7  
  return; 2@!B;6*8q  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); r+ usMF<'  
 str.ReleaseBuffer(); #0:rBKm,  
 m_Path=str; xC9?Wt'  
 if(str.GetAt(str.GetLength()-1)!='\\') S "/-)_{  
  m_Path+="\\"; F@b=S0}K  
 UpdateData(FALSE); 1'%n?\OK66  
} XFv^j SF  
]G~Z'fs<(  
void CCaptureDlg::SaveBmp() IAJ+n0U  
{ &a+=@Z)kf  
 CDC dc; B"rO  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); C^fn[plL  
 CBitmap bm; d[YG&.}+8j  
 int Width=GetSystemMetrics(SM_CXSCREEN); *mz-g7  
 int Height=GetSystemMetrics(SM_CYSCREEN); !E6Q ED"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); H@te!EE  
 CDC tdc; *LEI@  
 tdc.CreateCompatibleDC(&dc); c5Hyja=  
 CBitmap*pOld=tdc.SelectObject(&bm); TSH'OW !b  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); X.V4YmZ- ;  
 tdc.SelectObject(pOld); A`* l+M^z  
 BITMAP btm; 2%/+r  
 bm.GetBitmap(&btm); WIN3*z7oW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; as(Zb*PdH  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ><qA+/4]_  
 BITMAPINFOHEADER bih; )XDbg>  
 bih.biBitCount=btm.bmBitsPixel; s &f\gp1  
 bih.biClrImportant=0; w8bvqTQ  
 bih.biClrUsed=0; r&_e3#]*  
 bih.biCompression=0; E"7[|-`e6  
 bih.biHeight=btm.bmHeight; hlfdmh? /  
 bih.biPlanes=1; ?ph>:M  
 bih.biSize=sizeof(BITMAPINFOHEADER); MvTp%d.  
 bih.biSizeImage=size; x@@bC=iY$  
 bih.biWidth=btm.bmWidth; 6$K@s  
 bih.biXPelsPerMeter=0; 3:>hHQi  
 bih.biYPelsPerMeter=0; M}$Td_g  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); K,,'{j2#f  
 static int filecount=0; qFI19`?8E  
 CString name; tF6-@T\6  
 name.Format("pict%04d.bmp",filecount++); o%OwKp s  
 name=m_Path+name; xkQT#K=i  
 BITMAPFILEHEADER bfh; ~sdM~9@ '  
 bfh.bfReserved1=bfh.bfReserved2=0; iZ4"@G:,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Q)=2%X  
 bfh.bfSize=54+size; TUARYJ6=  
 bfh.bfOffBits=54; KV! (   
 CFile bf; rN,T}M= 2  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )SJ"IY\P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); z0UtKE^b  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RN$>!b/  
  bf.WriteHuge(lpData,size); 6m@B.+1  
  bf.Close(); Ed+jSO0  
  nCount++; 5z:#Bl-,L  
 } %a]Imsm  
 GlobalFreePtr(lpData); > qPP_^]  
 if(nCount==1) j^/=.cD|  
  m_Number.Format("%d picture captured.",nCount); $EL:Jx2<  
 else X6BOB?  
  m_Number.Format("%d pictures captured.",nCount); j_h0 hm]  
  UpdateData(FALSE); MpTOC&NG%s  
} !;K zR&  
O Q$C#:?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Yy;BJ_  
{ &UNQ4-s  
 if(pMsg -> message == WM_KEYDOWN) EMDYeXpV  
 { K)^8 :nt  
  if(pMsg -> wParam == VK_ESCAPE) p(fMM :  
   return TRUE; 5}b) W>3@`  
  if(pMsg -> wParam == VK_RETURN) PsZ>L  
   return TRUE; g@.e%  
 } 99"8d^{z  
 return CDialog::PreTranslateMessage(pMsg); +.gj/uy*  
} DG}s`'  
VB`% u=  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fYW9Zbov-  
{ n:f&4uKoG<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =G !]_d0  
  SaveBmp(); ^9><qKbO  
  return FALSE; /.~zk(-&h  
} _h 6c[*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ c7.M\f P  
 CMenu pop;  >hzSd@J&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,N nh$F  
 CMenu*pMenu=pop.GetSubMenu(0); (/E@.z[1  
 pMenu->SetDefaultItem(ID_EXITICON); 0\, !  
 CPoint pt; 4K 8(H9(  
 GetCursorPos(&pt); *U$%mZS]1  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); fe8hgTP|  
 if(id==ID_EXITICON) FNw]DJ]  
  DeleteIcon(); qC5IV}9`  
 else if(id==ID_EXIT) yF1p^>*ak&  
  OnCancel(); 'rq@9$h1W  
 return FALSE; x&r f]R  
} d%RH]j4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9aX!<Z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #$]8WSl  
 AddIcon(); ou{V/?rb  
 return res; ah,"c9YX  
} @( 0O9L F  
4dm0:, G  
void CCaptureDlg::AddIcon() ~,Yd.?.TI  
{ IfT: 9 &  
 NOTIFYICONDATA data; )1YX+',"  
 data.cbSize=sizeof(NOTIFYICONDATA); 2.\"Q  
 CString tip; Y/?z8g'p  
 tip.LoadString(IDS_ICONTIP); LXZI|K[}k  
 data.hIcon=GetIcon(0); 0g~Cdp  
 data.hWnd=GetSafeHwnd(); 3E0C$v KM  
 strcpy(data.szTip,tip); Z{/GT7 /  
 data.uCallbackMessage=IDM_SHELL; rU(-R@["  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l%p,m [  
 data.uID=98; m77 !i>V)  
 Shell_NotifyIcon(NIM_ADD,&data); G:@1.H`  
 ShowWindow(SW_HIDE); m#-&<=  
 bTray=TRUE; ddbQFAQQQ  
} c]i;0j? Dl  
IkG;j+=  
void CCaptureDlg::DeleteIcon() Vol}wc  
{ ,`YIcrya:  
 NOTIFYICONDATA data; Z$B%V t  
 data.cbSize=sizeof(NOTIFYICONDATA); Ypxp4B  
 data.hWnd=GetSafeHwnd(); =LgMG^@mu  
 data.uID=98; uy<<m"cA;  
 Shell_NotifyIcon(NIM_DELETE,&data); &aa3BgxyE  
 ShowWindow(SW_SHOW); -%Rbd0gVH\  
 SetForegroundWindow(); awjAv8tPO!  
 ShowWindow(SW_SHOWNORMAL); }Oqt=Wm  
 bTray=FALSE; r8!pk~R5]  
} hc|#JS2H@y  
'=eVem=  
void CCaptureDlg::OnChange() fJ6Q:7  
{ URt+MTU[  
 RegisterHotkey(); V F b  
} )eqF21\  
6urU[t1  
BOOL CCaptureDlg::RegisterHotkey() _/u(:  
{ ((<\VQ,>(  
 UpdateData(); J1Az+m  
 UCHAR mask=0; )o-mM tPj  
 UCHAR key=0; 1Dhu 5ht  
 if(m_bControl) (_6JQn  
  mask|=4; #k[Y(_  
 if(m_bAlt) yk(r R  
  mask|=2; iXWB  
 if(m_bShift) JT=ax/%Mo  
  mask|=1; =-&h@mB;G  
  key=Key_Table[m_Key.GetCurSel()]; l|iOdKr h  
 if(bRegistered){ >_G'o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2E`mbT,v&  
  bRegistered=FALSE; =''b`T$  
 } B =7maYeU  
 cMask=mask;  cV_-Bcb  
 cKey=key; "@|rU4Y  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); t;-F]  
 return bRegistered; X[f)0w%  
} c-!3wvt)  
B(5>H2  
  四、小结 ^SW9J^9  
K4+|K:e  
  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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