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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: MUjfqxTT  
  1Vi3/JM @  
  一、实现方法 q37d:Hp  
*%p`Jk-U  
  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: Xub<U>e;b  
D.:6X'hp  
#pragma data_seg("shareddata") M:/)|fk  
HHOOK hHook =NULL; //钩子句柄 CA[3 R  
UINT nHookCount =0; //挂接的程序数目 i[7<l&K]  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 k[<Uxh%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 }Y`D^z~  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey #[B]\HO  
static int KeyCount =0; K?$|Y-_D^M  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6t!PHA  
#pragma data_seg() 2, R5mL$  
s1kG:h2|$  
  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。 .sBwJZ  
d,+a}eTP'  
  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: 5u=$m^@{  
'5; /V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [#mRlL0yk  
cKey,UCHAR cMask) AdGDs+at,  
{ <%b a 3<sg  
 BOOL bAdded=FALSE;  f2.|[  
 for(int index=0;index<MAX_KEY;index++){ "f N=Y$G  
  if(hCallWnd[index]==0){ kC8M2|L  
   hCallWnd[index]=hWnd; /kH 7I  
   HotKey[index]=cKey; JZ>E<U9&  
   HotKeyMask[index]=cMask; ,(y6XUV~  
   bAdded=TRUE; 8kYI ~  
   KeyCount++; 45aFH}w:  
   break; @ CNe)&U  
  } +.pri  
 } V*j1[d  
 return bAdded; `:#IZ  
} ]}z"H@k  
//删除热键 /^rJ`M[;  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Tg_#z  
{ pz0Q@n/X  
 BOOL bRemoved=FALSE; 3;Y 9<  
 for(int index=0;index<MAX_KEY;index++){ }O+`X) 9  
  if(hCallWnd[index]==hWnd){ .9VhDrCK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ o ~`KOe  
    hCallWnd[index]=NULL; AQm#a;  
    HotKey[index]=0; kkU#0p?7  
    HotKeyMask[index]=0; #w1E3ahaX  
    bRemoved=TRUE; 35 d:r:  
    KeyCount--; GzEvp  
    break; q~6a$8+t  
   } Qy7pM8~h  
  } 8{DW$Z tR  
 } v7b +  
 return bRemoved; ?X^.2+]*&  
} 0@>  
x%`tWE|  
:3A^5}iz  
  DLL中的钩子函数如下: 9r=yfc!cS  
)'i n}M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) /K :H2?J  
{ 2ut)m\)/)  
 BOOL bProcessed=FALSE; GV8`.3DBOF  
 if(HC_ACTION==nCode) #&,~5  
 { XDyFe'1I  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ,u S)N6'b6  
   switch(wParam) 3DOc,}nI~@  
   {  @d_9NOmNT  
    case VK_MENU: Y$0K}`{  
     MaskBits&=~ALTBIT; @pN6uDD}R  
     break; Rc(E';uc  
    case VK_CONTROL: 4|h>.^  
     MaskBits&=~CTRLBIT; nj=nSD  
     break; =;{8)m  
    case VK_SHIFT: iLk"lcX  
     MaskBits&=~SHIFTBIT; }e-D&U  
     break; vl>_;} W7  
    default: //judge the key and send message F5 7Kr5X  
     break; 3B5 `Y  
   } U-pBat.$'C  
   for(int index=0;index<MAX_KEY;index++){ Cig! 3  
    if(hCallWnd[index]==NULL) >uR;^B5m  
     continue; 4$ ^rzAi5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9E2OCLWrE  
    { .(Tf$V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Sh(XFUJ  
     bProcessed=TRUE; I<!,_$:  
    } suE#'0K  
   } ~}g) N  
  } qJK-HF:#  
  else if((lParam&0xc000ffff)==1){ //有键按下 I>:.fHvUC  
   switch(wParam) ^~W s4[Guo  
   { CGs5`a  
    case VK_MENU: G5 *_  
     MaskBits|=ALTBIT; PJ2m4ulY  
     break; ,lQfsntk'  
    case VK_CONTROL: b|u,[jEB  
     MaskBits|=CTRLBIT; 9d8U@=  
     break; %h}3}p#4  
    case VK_SHIFT: ALt^@|!d  
     MaskBits|=SHIFTBIT; &24>9  
     break; -5Aqf\  
    default: //judge the key and send message (``|5;T\  
     break; LX7<+`aa  
   } ;fB!/u  
   for(int index=0;index<MAX_KEY;index++){ 0pA>w8mh  
    if(hCallWnd[index]==NULL) Q+Ya\1$6A  
     continue; M7c53fz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =|qYaXjT$  
    { G&#l3bkQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); s=1w6ZLD  
     bProcessed=TRUE; YQaL)t$0  
    } c:,K{ZR  
   } !uN_<!  
  } `sM^m`yE  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 %$=}ePD  
   for(int index=0;index<MAX_KEY;index++){ a3^({;k!0  
    if(hCallWnd[index]==NULL) 2fG[q3`  
     continue; 8g6G},Y0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O>>%lr|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '/@i} digf  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ICUI0/J  
   } 54%h)dLDy  
  } s` o _ER  
 } 6Lz:J:Q)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); m ?jF:] ^  
} #RP7?yGM,  
92g&,Wb  
  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: XZ_vbYTj  
T4x[ \v5d  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q[TW  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); NXdT"O=P  
X;3gKiD  
  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: |=#uzp7*  
*+>QKR7  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %$zX a%A  
{ \-RVPa8k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ' O d_:]  
 { }+BbwBm&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 SAN/ fnM  
  SaveBmp(); H6i;MQ  
  return FALSE; Q#sLIZ8=  
 } wj|[a,(r  
 …… //其它处理及默认处理 !KmSLr7xU  
} 2qDVAq^@  
=l1O9/\9  
@1+({u#B  
  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。 $s!2D"wl n  
.u&GbM%Ga  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Dt]*M_  
@M8vP H  
  二、编程步骤 btv.M  
o7t#yw3  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; wQ~F%rQ$  
rWxQ;bb#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 5Jm %*Wb  
P> i lRb  
  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; o 9{~F`{p  
<wO8=bem  
  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; D|X@aUp 8}  
w $z]Z-  
  5、 添加代码,编译运行程序。 ljw>[wNv  
D7OPFN 7`  
三、程序代码 xGo,x+U*  
B&4NdL/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ewp&QH4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) VXIB9 /*i  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ?;?$\ b=  
#if _MSC_VER > 1000 8@d,TjJDo  
#pragma once J G3#(DVc;  
#endif // _MSC_VER > 1000 0ZjinWkR[  
#ifndef __AFXWIN_H__ _Sn7z?  
#error include 'stdafx.h' before including this file for PCH +N>&b%  
#endif D+69U[P_A  
#include "resource.h" // main symbols ^{w]r5d  
class CHookApp : public CWinApp XonI   
{ H?W8_XiN  
 public: !%Qm{R  
  CHookApp(); 2N[S*#~*e  
  // Overrides g=_@j`  
  // ClassWizard generated virtual function overrides ?(P3ZTk?.  
  //{{AFX_VIRTUAL(CHookApp) d6;"zW|Ec  
 public: ;PF!=8dW  
  virtual BOOL InitInstance(); L[cl$ pYV  
  virtual int ExitInstance(); Gs)2HR@>  
  //}}AFX_VIRTUAL p:CpY'KV_  
  //{{AFX_MSG(CHookApp) "L~qsFL  
  // NOTE - the ClassWizard will add and remove member functions here. @"gWv s  
  // DO NOT EDIT what you see in these blocks of generated code ! F)^:WWVc#  
  //}}AFX_MSG tv8}O([  
  DECLARE_MESSAGE_MAP() y{]iwO;  
}; E4dN,^_ F!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6 s1lf!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); + 4*jO5EZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'Z=8no`<  
BOOL InitHotkey(); =TG[isC/F9  
BOOL UnInit(); l=?G"1  
#endif *='J>z.]  
yPhTCr5pK  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. -OPJB:7Z  
#include "stdafx.h" /R% Xkb  
#include "hook.h" tj=l!  
#include <windowsx.h> 3T7,Y(<V  
#ifdef _DEBUG Me XGE  
#define new DEBUG_NEW ofIw7D*h  
#undef THIS_FILE I# U"DwM  
static char THIS_FILE[] = __FILE__; B+8B<xZ  
#endif 9et%Hn.K'  
#define MAX_KEY 100 -"Hy%wE  
#define CTRLBIT 0x04 7C"&f *lEi  
#define ALTBIT 0x02 ygn]f*;?kw  
#define SHIFTBIT 0x01 &q0s8'qA  
#pragma data_seg("shareddata") zUCtH*  
HHOOK hHook =NULL; :]g>8sWL  
UINT nHookCount =0; k-N` h  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bw& U[|A0%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |E#+X  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey D?:AHj%gW  
static int KeyCount =0; sF+Bu'9A  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift wz{]CQ7"  
#pragma data_seg() "{F e  
HINSTANCE hins; Gl@}b\TB  
void VerifyWindow(); >azTAX6L3  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0v/}W(  
//{{AFX_MSG_MAP(CHookApp) w%L::Z4  
// NOTE - the ClassWizard will add and remove mapping macros here. 0M_~@E*&  
// DO NOT EDIT what you see in these blocks of generated code! oYn|>`+6:y  
//}}AFX_MSG_MAP 1o*eu&@  
END_MESSAGE_MAP() \sZT[42  
M~jV"OF=  
CHookApp::CHookApp() +P5\N,,7R  
{ P UJkC  
 // TODO: add construction code here, {InD/l'v6n  
 // Place all significant initialization in InitInstance y.PsC '  
} zm7IkYF  
B{ptP4As-  
CHookApp theApp; NplWF\5y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zs<2Ozv  
{  ^D.u   
 BOOL bProcessed=FALSE; /3`(Ki{ Q  
 if(HC_ACTION==nCode) [zv@}@$  
 { ,6iXlch  
  if((lParam&0xc0000000)==0xc0000000){// Key up 44p?x8(z*  
   switch(wParam) Q]v><  
   { )=]u]7p}  
    case VK_MENU: 9\J.AAk~/  
     MaskBits&=~ALTBIT; 9yrSCDu00  
     break; FT$Z8  
    case VK_CONTROL: V9dJNt'Ui  
     MaskBits&=~CTRLBIT; '1r<g\ l  
     break; ;?K>dWf3f  
    case VK_SHIFT: io1hUZ  
     MaskBits&=~SHIFTBIT; zlhHSyK  
     break; iu9<]1k  
    default: //judge the key and send message J% mtlA  
     break; |h6u%t2AY  
   } )'3V4Z&  
   for(int index=0;index<MAX_KEY;index++){ *@(j'0hj  
    if(hCallWnd[index]==NULL) !x@3U^${  
     continue; abgA Ug)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) zHu w[  
    { M?QK4Zxb6U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); j : $Ruy  
     bProcessed=TRUE; 8uD%  
    } L7rH=gZ&!]  
   } 'n dXM   
  } }VDJ  
  else if((lParam&0xc000ffff)==1){ //Key down %%h0 H[5*  
   switch(wParam) N}rc3d#  
   {  Bl1^\[#  
    case VK_MENU: MLk%U 4  
     MaskBits|=ALTBIT; W#sCvI@   
     break; 'irHpN6n  
    case VK_CONTROL: Y4j%K~ls Y  
     MaskBits|=CTRLBIT; 1 LUvs~Qu  
     break; u`~,`z^{n  
    case VK_SHIFT: 3Q\k!$zq  
     MaskBits|=SHIFTBIT; xwjiNJ Gj  
     break; :|TQi9L$rj  
    default: //judge the key and send message 3U!#rz"  
     break; S #6:!  
   } 4E 0 Y=  
   for(int index=0;index<MAX_KEY;index++) W'3~vQF  
   { qw35LyL  
    if(hCallWnd[index]==NULL) dR@XwEpP  
     continue; %Xjg/5G-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^W*3S[-`g  
    { Zg;%$ kSQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x$+g/7*  
     bProcessed=TRUE; ^w6~?'}  
    } @ ?CEi#-  
   } v~`'!N8  
  } sB+ B,DF  
  if(!bProcessed){ & T&>4I!'M  
   for(int index=0;index<MAX_KEY;index++){ rOA{8)jIa*  
    if(hCallWnd[index]==NULL) ay`A Gr  
     continue; [\,Jy8t)\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) yDmx)^En  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); RM6*c .  
   }  Lxqv  
  } GS&iSjw  
 } Ux b>)36I  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); DC+l3N  
} R!y`p:O C  
kpLx?zW--q  
BOOL InitHotkey() "*JyNwf  
{ \I+#M-V  
 if(hHook!=NULL){ ;JV(!8[  
  nHookCount++; W`gzMx  
  return TRUE; -W'T3_  
 } l0nm>ps'D  
 else {No Y`j5S  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); G^&P'*  
  if(hHook!=NULL) klxNGxWAX  
   nHookCount++; wq = Ef  
  return (hHook!=NULL); 9`Zwa_Tni  
} i&Xjbcbp  
BOOL UnInit() UtYwG#/w  
{ }zy h!  
 if(nHookCount>1){ TS49{^d$  
  nHookCount--; C|-QU  
  return TRUE; 2!Sl!x+i\'  
 } Cu`ty] -'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D V=xqC6}  
 if(unhooked==TRUE){ G' 0JK+=o  
  nHookCount=0; Ta NcnAY>9  
  hHook=NULL; [|tlTk   
 } <Oihwr@5<  
 return unhooked; b<8,'QgB  
} 4o ,G[Cf_  
_ 0h)O  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .~7:o.BE`n  
{ {N'<_%cu  
 BOOL bAdded=FALSE; 0+3{fD/  
 for(int index=0;index<MAX_KEY;index++){ -n~%v0D8c  
  if(hCallWnd[index]==0){ #j4jZBOTM  
   hCallWnd[index]=hWnd;  Vl`!6.F3  
   HotKey[index]=cKey; S:{`eDk\A_  
   HotKeyMask[index]=cMask; )JXy>q#  
   bAdded=TRUE; |"i"8~/@<  
   KeyCount++; 8Bwm+LYr-  
   break; 82KWe=  
  } O*udVE>  
 } -h%1rw  
 return bAdded; v%E~sX&CG  
} V(P 1{g  
$VnPs!a  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?L+|b5RS  
{ {VT**o  
 BOOL bRemoved=FALSE; Rg%Xy`gS  
 for(int index=0;index<MAX_KEY;index++){ Hd89./v`:  
  if(hCallWnd[index]==hWnd){ oz&RNB.K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ .Zm de*b  
    hCallWnd[index]=NULL; DyM<aT  
    HotKey[index]=0; eZMfn$McJv  
    HotKeyMask[index]=0; Q=h37]U+  
    bRemoved=TRUE; tKY g  
    KeyCount--; {+jO/ZQu5  
    break; 8c5=Px2\  
   } wj 15Og?  
  } j5MUP&/g3  
 } }S 6h1X  
 return bRemoved; &x)nK  
} FE3uNfQs|  
3,)[Q?nKD  
void VerifyWindow() Iwe  
{ m ;{(U Z  
 for(int i=0;i<MAX_KEY;i++){ xwa@h}\#  
  if(hCallWnd!=NULL){ .Z(Q7j^  
   if(!IsWindow(hCallWnd)){ MN[D)RKh;  
    hCallWnd=NULL; cQrXrij;!  
    HotKey=0;  I|. <  
    HotKeyMask=0; 4P}d/w?'KL  
    KeyCount--; _71&".A  
   } " 1%\Fil  
  } <{IeCir  
 } 'RZ0,SK'  
} l._g[qa  
Qb8Z+7  
BOOL CHookApp::InitInstance() [BKOK7QK|  
{ N*SUA4bnuM  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); N9 TM  
 hins=AfxGetInstanceHandle(); vQ8$C 3  
 InitHotkey(); =55V<VI  
 return CWinApp::InitInstance(); ;jh.\a_\  
} uTNy{RBD+  
: `,#z?Rk  
int CHookApp::ExitInstance() lm|s%  
{ 8^!ib/@v"  
 VerifyWindow(); &(h@]F!  
 UnInit(); &"DD&87N%  
 return CWinApp::ExitInstance(); <jqL4!<  
} P5__[aTD  
J3hhh(  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file s:ojlmPb  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =yZ6$ hK  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H/l,;/q]b  
#if _MSC_VER > 1000 +>Pq]{Uf1j  
#pragma once X0]Se(  
#endif // _MSC_VER > 1000 SK 5__Ix  
7>f)pfLM  
class CCaptureDlg : public CDialog ~h$ H@&5  
{ nPhREn!  
 // Construction `KUL 4) g~  
 public: +de5y]1H,|  
  BOOL bTray; K~+x@O*  
  BOOL bRegistered; s8SCEpz  
  BOOL RegisterHotkey(); et<@3wyd]  
  UCHAR cKey; #M<u^$Jz  
  UCHAR cMask; mh35S!I3I^  
  void DeleteIcon(); e}iv vs2  
  void AddIcon(); f!G%$?]  
  UINT nCount; !, {-q)'D  
  void SaveBmp(); l"%WXi"X  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]W7&ZpF  
  // Dialog Data W?0u_F  
  //{{AFX_DATA(CCaptureDlg) +/r h8?  
  enum { IDD = IDD_CAPTURE_DIALOG }; M7ug < 8i  
  CComboBox m_Key; 0>:`|IGnT2  
  BOOL m_bControl; 4F+G;'JV  
  BOOL m_bAlt; mxICQ>s b  
  BOOL m_bShift; Ryn@">sVI  
  CString m_Path; v1$ }JX   
  CString m_Number; ~>$z1o&}.  
  //}}AFX_DATA aZ}z/.b]  
  // ClassWizard generated virtual function overrides ).jna`A,  
  //{{AFX_VIRTUAL(CCaptureDlg) *}Rd%'  
 public: eNrwkV^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ZK8DziO  
 protected: XlJ+:st  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support N|w;wF!3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); gXB&Sgjo  
  //}}AFX_VIRTUAL Y^gIvX  
  // Implementation QY$4D;M`g6  
 protected: L>!MEMqm  
  HICON m_hIcon; Nrc-@ ]  
  // Generated message map functions d{DBG}/Yg  
  //{{AFX_MSG(CCaptureDlg)  =h}PL22  
  virtual BOOL OnInitDialog(); m^4Ojik  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); I bE Nq  
  afx_msg void OnPaint(); $B`bsJ  
  afx_msg HCURSOR OnQueryDragIcon(); CN7qqd  
  virtual void OnCancel(); (ewcj\l4*  
  afx_msg void OnAbout(); BF U#FE)s  
  afx_msg void OnBrowse(); _RX*Ps=  
  afx_msg void OnChange(); EiWd =jDm  
 //}}AFX_MSG j4h?"  
 DECLARE_MESSAGE_MAP() B9oB5E  
}; qb5IpI{U  
#endif *'R2Lo<C  
#DcK{|ty  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1 w9Aoc  
#include "stdafx.h" qGie~S ##  
#include "Capture.h" h3;RVtS  
#include "CaptureDlg.h" Yq:TW eZD  
#include <windowsx.h> a0Q\]S  
#pragma comment(lib,"hook.lib") XU$\.g p-  
#ifdef _DEBUG IFWP&20  
#define new DEBUG_NEW IeBb#Qedz  
#undef THIS_FILE Dz+R Q`Vn  
static char THIS_FILE[] = __FILE__; |R(rb-v  
#endif kZS&q/6A*  
#define IDM_SHELL WM_USER+1 VB{G% !}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IF|%.%I$!U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); )F:UkS  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @fSqGsSk  
class CAboutDlg : public CDialog =JB1]b{|  
{ mOx>p"n  
 public: jI807g+  
  CAboutDlg(); ^os|yRzV*M  
  // Dialog Data P4~C0z  
  //{{AFX_DATA(CAboutDlg) ; ,:w % .  
  enum { IDD = IDD_ABOUTBOX }; U+g<lgH1J  
  //}}AFX_DATA NGb\e5?  
  // ClassWizard generated virtual function overrides Y ptP_R:2p  
  //{{AFX_VIRTUAL(CAboutDlg) gnU##Km|  
 protected: q=cH ^`<.  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ca8.8uHY\  
  //}}AFX_VIRTUAL X !l#1  
  // Implementation Q GDfX_  
 protected: l%$co07cX  
  //{{AFX_MSG(CAboutDlg) B!z5P" C(~  
  //}}AFX_MSG G G[$-  
  DECLARE_MESSAGE_MAP()   |HB  
}; KmRxbf  
+W9#^  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Iw) 'Yyg  
{ a]_eSU@  
 //{{AFX_DATA_INIT(CAboutDlg) -pm^k-%v  
 //}}AFX_DATA_INIT v"G)G)*z  
} .(2ui~ed  
p=8?hI/bim  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 4vRIJ}nQ  
{ XvspE}~y  
 CDialog::DoDataExchange(pDX); B":u5_B  
 //{{AFX_DATA_MAP(CAboutDlg) Se %"C&  
 //}}AFX_DATA_MAP \d{S3\7  
} %QrpFE5 V5  
2s:$4]K D  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %{M&"Mv  
 //{{AFX_MSG_MAP(CAboutDlg) . 'rC'FT  
 // No message handlers F%>`?NG+c  
 //}}AFX_MSG_MAP -|~tZuf  
END_MESSAGE_MAP() sj0{;>>%+N  
2DTBL:?`  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) |v%xOl  
: CDialog(CCaptureDlg::IDD, pParent) 'VTLp.~G~  
{ #q%V|Ajq  
 //{{AFX_DATA_INIT(CCaptureDlg) <v =T31aS  
  m_bControl = FALSE; s0x;<si_  
  m_bAlt = FALSE; /NFcIU  
  m_bShift = FALSE; $q~:%pQv  
  m_Path = _T("c:\\"); +_LWN8F  
  m_Number = _T("0 picture captured."); 3fWL}]{<a  
  nCount=0; Z,jK(7D(  
  bRegistered=FALSE; c/G]r|k  
  bTray=FALSE; [Vaw$c-+[y  
 //}}AFX_DATA_INIT R s)Nz< d  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 -<tfbaA  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ]#VNZ#("  
} _Y gvLz %  
52JtEt7E  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) oCftI':@  
{ &p2fMVWJ7  
 CDialog::DoDataExchange(pDX); +kK6G#c  
 //{{AFX_DATA_MAP(CCaptureDlg) c={bunnz#  
  DDX_Control(pDX, IDC_KEY, m_Key); oH|<(8efD  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); %>G(2)Fb\\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Wa|lWIMK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); W;Ei>~E  
  DDX_Text(pDX, IDC_PATH, m_Path);  1ZF>e`t8  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wJQ"|  
 //}}AFX_DATA_MAP i>`!W|=_  
} b0_Ih6  
x)<Hr,wd  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) F};G&  
//{{AFX_MSG_MAP(CCaptureDlg) G*;6cV19  
 ON_WM_SYSCOMMAND() h^}r$k_n  
 ON_WM_PAINT() h NCoX*icd  
 ON_WM_QUERYDRAGICON() n rpxZA  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Z/S7ei@56  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) c)tG1|Og]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) #AJo75E%  
//}}AFX_MSG_MAP hvS4"% \  
END_MESSAGE_MAP() *uq}jlD`!  
0ThX1)SH  
BOOL CCaptureDlg::OnInitDialog() Tl9;KE|  
{ RN%*3{-  
 CDialog::OnInitDialog(); 7:D@6<J?  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); uzx?U3.\  
 ASSERT(IDM_ABOUTBOX < 0xF000); 2/c^3[ccR  
 CMenu* pSysMenu = GetSystemMenu(FALSE); I,@f*o  
 if (pSysMenu != NULL) _8U 5mW  
 { Oa'DVfw2J  
  CString strAboutMenu; ~ j`; $o  
  strAboutMenu.LoadString(IDS_ABOUTBOX); i.e1?Zk1  
  if (!strAboutMenu.IsEmpty()) s]"NqwIPK  
  { azxGUS_i<  
   pSysMenu->AppendMenu(MF_SEPARATOR); VNmQ'EuV}2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); #0WGSIht<  
  } H.HXwN/x  
 } /Y>$w$S  
 SetIcon(m_hIcon, TRUE); // Set big icon  jx3J$5  
 SetIcon(m_hIcon, FALSE); // Set small icon i'$V'x'k  
 m_Key.SetCurSel(0); QyGTm"9l  
 RegisterHotkey(); ,p,$(V  
 CMenu* pMenu=GetSystemMenu(FALSE); v^=Po6S[{+  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !`rR;5&sT  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \!erP!$x .  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); \=O['#  
 return TRUE; // return TRUE unless you set the focus to a control |Mj2lZS  
} 3:XF7T  
NEpomE(>x  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b6FC  
{ W_%p'8,  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Eu4-=2!4  
 { [=})^t?8  
  CAboutDlg dlgAbout; H}R/_5g  
  dlgAbout.DoModal(); !&$uq|-  
 } B~[QmK  
 else < ] ~FX 25  
 { s7A3CY]->  
  CDialog::OnSysCommand(nID, lParam); 6`tc]a"#Zb  
 } Pp*:rA"N  
} 'UYxVh9D  
3N(5V;ti  
void CCaptureDlg::OnPaint() 00?_10x)  
{ (Q_J{[F  
 if (IsIconic()) /E/Z0<l7  
 { WRa4g  
  CPaintDC dc(this); // device context for painting V__|NVoOm  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); AG3iKk??T  
  // Center icon in client rectangle B<99-7x3  
  int cxIcon = GetSystemMetrics(SM_CXICON); -W/Lg5eK  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7Rba@ cs9  
  CRect rect; * LaL('.>  
  GetClientRect(&rect); !O`aaLc  
  int x = (rect.Width() - cxIcon + 1) / 2; Ihd{ @6m  
  int y = (rect.Height() - cyIcon + 1) / 2; pk%%}tP<  
  // Draw the icon tJ"8"T#6Vr  
  dc.DrawIcon(x, y, m_hIcon);  iI!MF1  
 } `b11,lg  
 else ?06+"Z  
 { B<p-qPR K  
  CDialog::OnPaint(); _~l*p"PL<  
 } >/r^l)`9_f  
} c Y C@@?  
% `4\ 8H`  
HCURSOR CCaptureDlg::OnQueryDragIcon() %nRz~3X|+v  
{ DOsQVdH  
 return (HCURSOR) m_hIcon; F*}.0SQ  
} TFQX}kr]  
W~!uSrY  
void CCaptureDlg::OnCancel() Jq5](F!z  
{ c%jW'  
 if(bTray) ;R_H8vp  
  DeleteIcon(); G1=/G  
  CDialog::OnCancel(); r1jsw j%7  
} hxB` hu-  
33M10 1X{6  
void CCaptureDlg::OnAbout() W$>AK_Y}  
{ QY^v*+lr\  
 CAboutDlg dlg; Wx`| u  
 dlg.DoModal(); fz[-pJ5[  
} oEuV&m|yX  
yP~O C|Z  
void CCaptureDlg::OnBrowse() !W4X4@  
{ Z ? F*Z0y  
 CString str; ZLS\K/F>>=  
 BROWSEINFO bi; Pf,lZU?f  
 char name[MAX_PATH]; Fv )H;1V  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); oIJ.Tv@N(  
 bi.hwndOwner=GetSafeHwnd(); eyIbjgpV  
 bi.pszDisplayName=name; wn&5Ul9Elb  
 bi.lpszTitle="Select folder"; 4g "_E  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Qp5YS  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0sR+@\  
 if(idl==NULL) ?r%kif)  
  return; j,J/iJs  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y.6Yl**l  
 str.ReleaseBuffer(); ?O|CY  
 m_Path=str; 6a%dq"5 +  
 if(str.GetAt(str.GetLength()-1)!='\\') )Bb:?!EuEH  
  m_Path+="\\"; RHIGNzSz  
 UpdateData(FALSE); KB\A<(o,  
} :rdnb=n  
Q$B\)9`v[  
void CCaptureDlg::SaveBmp() LPRvzlY=  
{ 3yXSv1  
 CDC dc; +ak<yV1=  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ro8c-[V  
 CBitmap bm; @@QB,VS;{<  
 int Width=GetSystemMetrics(SM_CXSCREEN); z"PU`v  
 int Height=GetSystemMetrics(SM_CYSCREEN); W02t6DW  
 bm.CreateCompatibleBitmap(&dc,Width,Height); j +u3VP  
 CDC tdc; S4!}7NOh  
 tdc.CreateCompatibleDC(&dc); &~MM\,KML  
 CBitmap*pOld=tdc.SelectObject(&bm); -NL=^O$G  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 'X(Sn3  
 tdc.SelectObject(pOld); v*3tqT(%  
 BITMAP btm; 6qYK"^+xu  
 bm.GetBitmap(&btm); D:DtP6  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &XF@Dvv  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ig}H7U2q@  
 BITMAPINFOHEADER bih; 37U$9]  
 bih.biBitCount=btm.bmBitsPixel; mzH3Q564  
 bih.biClrImportant=0; BqG7E t  
 bih.biClrUsed=0; v;$cx*?  
 bih.biCompression=0; .cCB,re  
 bih.biHeight=btm.bmHeight; 9X ^D(  
 bih.biPlanes=1; _Y 8RP%  
 bih.biSize=sizeof(BITMAPINFOHEADER); {K ,-fbE  
 bih.biSizeImage=size; i^_?C5  
 bih.biWidth=btm.bmWidth; = t!$72g\  
 bih.biXPelsPerMeter=0; sNbCOTow  
 bih.biYPelsPerMeter=0; "}ZUa~7  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); .J fV4!=o  
 static int filecount=0; 9|5>?'CqP  
 CString name; M?I^Od'8  
 name.Format("pict%04d.bmp",filecount++); ^oH!FN`;{  
 name=m_Path+name; lDF26<<\`  
 BITMAPFILEHEADER bfh; <52)  
 bfh.bfReserved1=bfh.bfReserved2=0; Ew$-,KC[  
 bfh.bfType=((WORD)('M'<< 8)|'B'); FF'Ul 4y  
 bfh.bfSize=54+size; geJO#;  
 bfh.bfOffBits=54; 1Uf8ef1,  
 CFile bf; 2& ZoG%)  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /}&@1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); snti*e4"V  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ^h~oxZJw  
  bf.WriteHuge(lpData,size); Y1s3 >`  
  bf.Close(); P%_PG%O2p  
  nCount++; g'nN#O  
 } S/H!a:_5r  
 GlobalFreePtr(lpData); yr, Oq~e  
 if(nCount==1) \L4+Dv<z  
  m_Number.Format("%d picture captured.",nCount); y - Ge"mY  
 else ly)L%hG  
  m_Number.Format("%d pictures captured.",nCount); ]~J.YX9ST  
  UpdateData(FALSE); ganXO5T$  
} ns;nle|m  
n&;-rj^qq  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ppXt8G3% x  
{ y jQpdO  
 if(pMsg -> message == WM_KEYDOWN) rn"}@5  
 { Zg2F%f$Y  
  if(pMsg -> wParam == VK_ESCAPE) x39n7+j4  
   return TRUE; uU#7SX(uu  
  if(pMsg -> wParam == VK_RETURN) [/Ya4=C@  
   return TRUE; {H$m1=S  
 } x"xtILrI  
 return CDialog::PreTranslateMessage(pMsg); 97~*Z|#<+  
} elw}(l<F  
nd?R|._R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }2i3  
{ -4!i(^w[m/  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ o;<oXv  
  SaveBmp(); y*fU_Il|!  
  return FALSE; SYZS@o  
} $IB>a  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Tx!c }  
 CMenu pop; 2 bQC 2  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ~e@pL*s  
 CMenu*pMenu=pop.GetSubMenu(0); >xa k  
 pMenu->SetDefaultItem(ID_EXITICON); oN/T>&d  
 CPoint pt; _m8JU  
 GetCursorPos(&pt); =|G l  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); #6 yi  
 if(id==ID_EXITICON) tzFgPeo$;  
  DeleteIcon(); |Lz:i +;  
 else if(id==ID_EXIT) <^,5z!z }  
  OnCancel(); rBUdHd9  
 return FALSE; T-L; iH~0  
} /92m5p  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); V$7SVq  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Gj}P6V _  
 AddIcon(); QX$i ]y%S  
 return res; R0v5mD$:G  
} &%/kPF~<  
(!^(74  
void CCaptureDlg::AddIcon() SmJ6Fm6  
{ $A/$M\ :  
 NOTIFYICONDATA data; X(;,-7Jw  
 data.cbSize=sizeof(NOTIFYICONDATA); +R_w- NI  
 CString tip; ZxRD+`  
 tip.LoadString(IDS_ICONTIP); f/:XIG  
 data.hIcon=GetIcon(0); UEvRK?mm=  
 data.hWnd=GetSafeHwnd(); 5$|wW}SA  
 strcpy(data.szTip,tip); ;&Oma`Ec  
 data.uCallbackMessage=IDM_SHELL; |<n+6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ~X/1%  
 data.uID=98; )D:I@`*  
 Shell_NotifyIcon(NIM_ADD,&data); aiKZ$KLC  
 ShowWindow(SW_HIDE); W]UGo,  
 bTray=TRUE; ;J[1S  
} fdD?"z  
[V5ebj:6w  
void CCaptureDlg::DeleteIcon() n~#%>C7  
{ )bqfj>%#c  
 NOTIFYICONDATA data; 2B# ]z  
 data.cbSize=sizeof(NOTIFYICONDATA); w6fVZY4  
 data.hWnd=GetSafeHwnd(); 'wd-!aZAd  
 data.uID=98; \wxS~T<&L  
 Shell_NotifyIcon(NIM_DELETE,&data); lglC1W-q  
 ShowWindow(SW_SHOW); ov=[g l  
 SetForegroundWindow(); XM$HHk}L;  
 ShowWindow(SW_SHOWNORMAL); ['MG/FKuv  
 bTray=FALSE; S3[rv  
} -$E_L :M  
;J~NfL  
void CCaptureDlg::OnChange() `5[d9z/6  
{ 1}C|Javkn  
 RegisterHotkey(); '*5I5'[ X,  
} c]>s(/}T  
gc 14%  
BOOL CCaptureDlg::RegisterHotkey() SsDe\"?Q  
{ %&+j(?9  
 UpdateData(); x.CNDG  
 UCHAR mask=0; y#:_K(A" k  
 UCHAR key=0;  iK$)Iy0  
 if(m_bControl) a W`q  
  mask|=4; &+\J "V8  
 if(m_bAlt) r=<Oy1m/  
  mask|=2; 92F (Sl  
 if(m_bShift) [2UjY^\;T  
  mask|=1; :A\8#]3  
  key=Key_Table[m_Key.GetCurSel()]; GqXnOmk  
 if(bRegistered){ A@BYd'}]  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \ %Er%yv)  
  bRegistered=FALSE; $9DV }  
 } 1D03Nbh|5  
 cMask=mask; wRn]  
 cKey=key; $R3]y9`?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ?GPTJ#=j=]  
 return bRegistered; .az +'1  
} n*6Oa/JG7  
t@[&8j2B>  
  四、小结 hPa:>e  
*p}b_A}D  
  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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