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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: $f>WR_F  
  A42At]  
  一、实现方法 [lS'GszA  
<WaiJy?  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: jR@-h"2*A  
1|/2%IDUI  
#pragma data_seg("shareddata") :L:;~tK  
HHOOK hHook =NULL; //钩子句柄 zQ]IlMt  
UINT nHookCount =0; //挂接的程序数目 j /-p3#c  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 )t&|oQ3sVG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ~SM2W%  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \'E_  
static int KeyCount =0; a6WE,4T9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 QI=SR  
#pragma data_seg() GD[~4G  
:KX/`   
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 XIBw&mWf  
 Ea\a:  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: W7(OrA!  
U@& <5'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR SKLQAE5  
cKey,UCHAR cMask) Y141Twjvd  
{ l[ @\!;|  
 BOOL bAdded=FALSE; iCAd7=o  
 for(int index=0;index<MAX_KEY;index++){ ih+kh7J-  
  if(hCallWnd[index]==0){ b4%IyJr  
   hCallWnd[index]=hWnd; Syp|s3u;  
   HotKey[index]=cKey; h^hEyrJw  
   HotKeyMask[index]=cMask; wk9tJ#}  
   bAdded=TRUE; +Ya-h~7;g#  
   KeyCount++;  C&e  
   break; % Pa-fee  
  } `9K'I-hv<8  
 } _tjFb_}Q  
 return bAdded; 5R"b1  
} C dZ;ZR  
//删除热键 &~E=T3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) i;|% hDNWA  
{ C 2oll-kN  
 BOOL bRemoved=FALSE; ^D.B^BR  
 for(int index=0;index<MAX_KEY;index++){ !+>yCy$~_  
  if(hCallWnd[index]==hWnd){ -v jjcyTt  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ JAB]kNvI  
    hCallWnd[index]=NULL; }=f}@JlFB  
    HotKey[index]=0; <V6#)^Or  
    HotKeyMask[index]=0; JH)&Ca>S  
    bRemoved=TRUE; r4D66tF  
    KeyCount--; _R5^4-Qe  
    break; Wc,8<Y'   
   } ,\=u(Y\I[  
  } 1>1|>%  
 } <NJ7mR}  
 return bRemoved; L~mL9[(,  
} u'32nf?  
VwC, +B  
jC\R8_  
  DLL中的钩子函数如下: ^<% w'*gR  
[MiD%FfcNH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H}U&=w'  
{ b7>;UX  
 BOOL bProcessed=FALSE; >_F& oA#  
 if(HC_ACTION==nCode) J2 5>t^  
 { YF:NRY[i  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 zkd#vAY(A  
   switch(wParam) Sl$dXB@  
   {  j|[s?YJl  
    case VK_MENU: E'r* g{,  
     MaskBits&=~ALTBIT; 6B+ @76wH  
     break; 9*2hBNp+  
    case VK_CONTROL: qp{NRNkQ  
     MaskBits&=~CTRLBIT; VX>_Sp s  
     break; n]o+KT\  
    case VK_SHIFT: 9J|YP}%  
     MaskBits&=~SHIFTBIT; N %?o-IY  
     break; 9J%>2AA  
    default: //judge the key and send message u8W*_;%:  
     break; +s S*EvF  
   } `r]Cd {G  
   for(int index=0;index<MAX_KEY;index++){ T\WNT#My  
    if(hCallWnd[index]==NULL) 6*LU+U=`  
     continue; {T^'&W>8G8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dT|z)-Z`  
    { *U8#'Uan  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4u(}eE f7  
     bProcessed=TRUE; Tbwq_3f K  
    } vj_oMmjKw  
   } 4]+ ^K`  
  } q?MYX=Y6  
  else if((lParam&0xc000ffff)==1){ //有键按下 UwM}!K7)G  
   switch(wParam) (Dn-vY'  
   { <r\)hx0ov  
    case VK_MENU: txgGL'  
     MaskBits|=ALTBIT;  $}F]pa[  
     break; K9P"ncMt  
    case VK_CONTROL: c]"B)I1L  
     MaskBits|=CTRLBIT; CVUJ(D&Q  
     break; 8bysg9H0  
    case VK_SHIFT: a-} %R  
     MaskBits|=SHIFTBIT; HaC3y[LJ0  
     break; \LYQZ*F  
    default: //judge the key and send message cp2fDn  
     break; y,r`8  
   } R5i8cjKZ?w  
   for(int index=0;index<MAX_KEY;index++){ ?ykZY0{B  
    if(hCallWnd[index]==NULL) g SwG=e\  
     continue; ft*0?2N~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1Efl|lV  
    { =ddx/zN  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ^&<*$Ai~  
     bProcessed=TRUE; V*m)h  
    } M$?6 '  
   } B~aOs>1 S]  
  } 2(rZ@Wl  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 RP X`2zr  
   for(int index=0;index<MAX_KEY;index++){ b(yO  
    if(hCallWnd[index]==NULL) F@*lR(4C  
     continue; [.I,B tY+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '?>eW 2d  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VoyH:  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 P3yiJ|vP  
   } 4GfLS.Ip  
  } Wu4Nq+  
 } C~;0A!@]Y  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Fa!)$eb7  
} +{%4&T<nHw  
)eFFtnu5  
  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: h]MVFn{  
G}-.xj]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); L@_">' pR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F=om^6G%X5  
j'i42-Lt/p  
  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: ._&lG3'  
iXm||?Rnx  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) >h[!gXL^  
{ xI: 'Hk1  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) N39nJqo>"  
 { q-G|@6O  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Qkib;\2  
  SaveBmp(); KYu(H[a  
  return FALSE; !~N4}!X3du  
 } <gdgcvd  
 …… //其它处理及默认处理 S8OVG4-  
} &7w>K6p  
+w.Kv ;  
n]DNxC@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。 WQ}!]$<"y  
qysa!B  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 x"8ey|@&,  
zf,%BI[Hr  
  二、编程步骤 }=hoATs  
fHd!/%iG  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; " q^#39i?  
n<:d%&^n  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; N4H+_g|  
qX+gG",8  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 'n[+r}3  
W/r mm*  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; [9O~$! <%  
+&7Kk9^  
  5、 添加代码,编译运行程序。 ,B%fjcn  
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三、程序代码 Yxd{&47  
:Jeo_}e 0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL tw/#ENo  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) XalJo@%-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =~hsKBt*  
#if _MSC_VER > 1000 ;}WtJ&y=M  
#pragma once adI!W-/R:  
#endif // _MSC_VER > 1000 ;4G\]%c)E{  
#ifndef __AFXWIN_H__ #$=8g RZj  
#error include 'stdafx.h' before including this file for PCH +`*qlP;  
#endif /c@*eU  
#include "resource.h" // main symbols bEBBwv  
class CHookApp : public CWinApp )Ig+uDGk  
{ {OO*iZ.O  
 public: 1BMB?I  
  CHookApp(); X 45x~8f  
  // Overrides Jq$_=X&  
  // ClassWizard generated virtual function overrides LZr0]g{Pu/  
  //{{AFX_VIRTUAL(CHookApp) hza> jR  
 public: Z'Exw-ca  
  virtual BOOL InitInstance(); " ^HK@$  
  virtual int ExitInstance(); :}@C9pqr2  
  //}}AFX_VIRTUAL StU  4{  
  //{{AFX_MSG(CHookApp) S jVsF1d_  
  // NOTE - the ClassWizard will add and remove member functions here. VYamskK[G:  
  // DO NOT EDIT what you see in these blocks of generated code ! U g}8y8  
  //}}AFX_MSG lt{lpH  
  DECLARE_MESSAGE_MAP() uu}`warW  
}; fvcW'T}r  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); z\fW )/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Xhcn]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); wMb)6YZs  
BOOL InitHotkey(); >4n+PXRXX  
BOOL UnInit(); K8HIuQ!=  
#endif D|@bGN  
%G;0T;0L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 4_PCq Ep)  
#include "stdafx.h" B_{HkQ.PW  
#include "hook.h" ]} 61vV  
#include <windowsx.h> qWsylC23  
#ifdef _DEBUG T@TIz z  
#define new DEBUG_NEW >~I#JQ%  
#undef THIS_FILE 0b/i r2  
static char THIS_FILE[] = __FILE__; ?X\3&Ujy$  
#endif .L9']zXc`  
#define MAX_KEY 100 OT%0{2c"]  
#define CTRLBIT 0x04 iI5+P`sE&J  
#define ALTBIT 0x02 *~ p (GC  
#define SHIFTBIT 0x01 +R-h ,$\=7  
#pragma data_seg("shareddata") !fY7"E{%%  
HHOOK hHook =NULL; 2w+U$6e C  
UINT nHookCount =0; hd+]Ok7"  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Sw~(uH_l  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT z{9=1XY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey N]NF\7(  
static int KeyCount =0; @q K]JK  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1y J5l,q  
#pragma data_seg() JVtQ ,oZ  
HINSTANCE hins; U-i.(UyZ  
void VerifyWindow(); .XXW|{  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 57wFf-P  
//{{AFX_MSG_MAP(CHookApp) 8S\RN&T$  
// NOTE - the ClassWizard will add and remove mapping macros here. xH-X|N  
// DO NOT EDIT what you see in these blocks of generated code! {~SaRB2<'  
//}}AFX_MSG_MAP ~#R9i^Y  
END_MESSAGE_MAP() k1)%.pt%  
r9# \13-  
CHookApp::CHookApp() 'OwyyPBF  
{ *U;'OWE[  
 // TODO: add construction code here, +TK3{5`!Ae  
 // Place all significant initialization in InitInstance 8) N@qUV  
} c.A Yx I"  
QT! 4[,4  
CHookApp theApp; ,R?np9wc  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) k|xtrW`qo;  
{ `lO(s%HC  
 BOOL bProcessed=FALSE; nd ink$  
 if(HC_ACTION==nCode) Z\~G U*Y.e  
 { X&M4MuL  
  if((lParam&0xc0000000)==0xc0000000){// Key up 'fx UV<K&  
   switch(wParam) sV/l5]b]  
   { .Da'pOe  
    case VK_MENU: S4N(cn&  
     MaskBits&=~ALTBIT; Yw'NX5#)g  
     break; qH> `}/,P  
    case VK_CONTROL: 4[yIOs  
     MaskBits&=~CTRLBIT; LJFG0 W  
     break; b&#DnZcf  
    case VK_SHIFT: F(5hmr  
     MaskBits&=~SHIFTBIT; 6KHN&P  
     break; :XG;ru%i  
    default: //judge the key and send message ,1oQ cC  
     break; ht=P\E  
   } b| M3 `  
   for(int index=0;index<MAX_KEY;index++){ Z(u5$<up  
    if(hCallWnd[index]==NULL) DC+b=IOz  
     continue; x YfD()w<I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b|xpNd-  
    { 4dawg8K`9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); q[3x2sR  
     bProcessed=TRUE; ?S Z1`.S  
    } G7GZDi  
   } s 5WqR 8  
  } NTo!'p:s  
  else if((lParam&0xc000ffff)==1){ //Key down '3 33Ctxy  
   switch(wParam) 0(U#)  
   { 6$U]9D  
    case VK_MENU: TlZT1H  
     MaskBits|=ALTBIT; \1"'E@+  
     break; g.py+ ZFJ  
    case VK_CONTROL: N_eX/ux  
     MaskBits|=CTRLBIT; /ID3s`D)  
     break; P{OAV+cG  
    case VK_SHIFT: ,`D~py,  
     MaskBits|=SHIFTBIT; kIHDeo%K}  
     break; _VE^/;$"l  
    default: //judge the key and send message Tm}rH]F&  
     break; O.aG[ wm8  
   } gr-9l0u  
   for(int index=0;index<MAX_KEY;index++) Vd^g9  
   { x8Loyt_C  
    if(hCallWnd[index]==NULL) 5 @U<I  
     continue; >Y7a4~ufko  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d) f@ 5/<  
    { Od+6 -J  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); K 0gI):  
     bProcessed=TRUE; I V%zO+  
    } 9. 'h^#C  
   } }En  
  } **9x?s  
  if(!bProcessed){ *B`Zq)  
   for(int index=0;index<MAX_KEY;index++){ 2M#M"LHo  
    if(hCallWnd[index]==NULL) 1b=lpw 1}  
     continue; 0a8/B>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) .2d9?p3Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O~j> ?  
   } L,y6^J!  
  } x{D yTtX<  
 } ^` un'5Vk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4tL<q_  
} 5T sUQc  
fYKOJ5f  
BOOL InitHotkey() coYij  
{ mF` B#  
 if(hHook!=NULL){ n>@oBG)!  
  nHookCount++; N0hE4t  
  return TRUE; ga?*DI8w  
 } [MuEoWrq(}  
 else ^N8)]F,  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); U(~+o  
  if(hHook!=NULL) <ZU=6Hq  
   nHookCount++; P[s8JDqu  
  return (hHook!=NULL); ]Q[p@gLd  
} ]HpA5q1ck  
BOOL UnInit() KNH1#30 K  
{ h iNEJ_f  
 if(nHookCount>1){ '_|h6<.k[  
  nHookCount--; UH3sH t  
  return TRUE; ~]ZpA-*@Ut  
 } %Uz(Vd#K  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2^?:&1:  
 if(unhooked==TRUE){  i2~  
  nHookCount=0; ,3nN[)dk  
  hHook=NULL; 'X shmZ0&  
 } 6uKTGc4  
 return unhooked; @A)R_p  
} (b`]M`Fc  
B]tIi^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lJ@][;  
{ g-Pwp[!qkf  
 BOOL bAdded=FALSE; zt^48~ry  
 for(int index=0;index<MAX_KEY;index++){ RT%pDym\  
  if(hCallWnd[index]==0){ xe/(  
   hCallWnd[index]=hWnd; EbqcV\Kb  
   HotKey[index]=cKey; P./VmY'  
   HotKeyMask[index]=cMask; |HZTN"  
   bAdded=TRUE; ^e+a  
   KeyCount++; %vBhLaE  
   break; A&>.74}p  
  } *OQG 4aWy  
 } $+7`Dy!  
 return bAdded; Q X%&~  
} 02Ia2e.f  
jM\*A#Jo5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D-,L&R!`  
{ a')|1DnR  
 BOOL bRemoved=FALSE; ZY:[ekm%4Z  
 for(int index=0;index<MAX_KEY;index++){ x\QY@9  
  if(hCallWnd[index]==hWnd){ O@YTAT&d#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >2By +/!X  
    hCallWnd[index]=NULL; Q[#vTB$f  
    HotKey[index]=0; _D|^.)=U|  
    HotKeyMask[index]=0; , lJ  v  
    bRemoved=TRUE; 1 E22R  
    KeyCount--; J!DF^fLe  
    break; frBX{L  
   } Y[ N^p#t{  
  } E#s)52z=B  
 } 'TA UE{{  
 return bRemoved; J+f!Ar  
} ;*,f<  
Zk[&IBE_  
void VerifyWindow() 2}W0 F2*  
{ c5mZG7-  
 for(int i=0;i<MAX_KEY;i++){ cm[c ze+*  
  if(hCallWnd!=NULL){ Q3"} Hl2  
   if(!IsWindow(hCallWnd)){ ^gFqRbuS  
    hCallWnd=NULL; *s;|T?~i  
    HotKey=0; Zy09L}59P  
    HotKeyMask=0; r 6Q Q  
    KeyCount--; 1nu^F,M  
   } SI8%M=P>  
  } @&}q} D  
 } t>H`X~SR?  
} |^9BA-nA  
=V^.}WtO  
BOOL CHookApp::InitInstance() }ZqW@ -  
{ K+6e?5t  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6[]]Y,Y  
 hins=AfxGetInstanceHandle(); m:hY`[ f6  
 InitHotkey(); }=!,o  
 return CWinApp::InitInstance(); FW.$5*f='  
} =H|6 GJ  
0T>H)c6:\  
int CHookApp::ExitInstance() ./$cMaDJ  
{ n k2om$nN  
 VerifyWindow(); %K]euEqs  
 UnInit(); Y\0}R,]a-  
 return CWinApp::ExitInstance(); @ps1Dr4s  
} ,[A'tUl _  
P<fnLQ9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !*`-iQo&  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 'L{8@gq i  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 1$*%"5a  
#if _MSC_VER > 1000 v)_nWu  
#pragma once cr;g5C V  
#endif // _MSC_VER > 1000 L_w+y  
1[ ]&(Pa  
class CCaptureDlg : public CDialog 1 n%?l[o  
{ aAy'\T$x.  
 // Construction _`#3f1F@[  
 public: &x > B  
  BOOL bTray; "HYQqNj?Z  
  BOOL bRegistered; ` }3qhar  
  BOOL RegisterHotkey(); J6<rX[ yZe  
  UCHAR cKey; 4H+Ked&Oq  
  UCHAR cMask; [le)P$#z  
  void DeleteIcon(); +x1eJug4  
  void AddIcon(); V#jWege  
  UINT nCount; 0 P[RyQI  
  void SaveBmp(); '<0J@^vZ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor IuZ) [*W  
  // Dialog Data fo4.JyBk  
  //{{AFX_DATA(CCaptureDlg) cT\I[9! )  
  enum { IDD = IDD_CAPTURE_DIALOG }; s[gKc'  
  CComboBox m_Key; FW"^99mrnb  
  BOOL m_bControl; "@9? QI}  
  BOOL m_bAlt; !`mZ0c+  
  BOOL m_bShift; 6DZ),F,M  
  CString m_Path; F:#J:x'  
  CString m_Number; hd 0 'u  
  //}}AFX_DATA w{dIFvQ"$  
  // ClassWizard generated virtual function overrides x3rlJs`$;  
  //{{AFX_VIRTUAL(CCaptureDlg) ?b!Fa  
 public: z_ =Bt  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >]%8Zx[  
 protected: 0R0{t=VJZ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Z@gnsPN^r  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); VxFOYC>p  
  //}}AFX_VIRTUAL 1&:@  
  // Implementation Kq.:G%  
 protected: [j4v]PE  
  HICON m_hIcon; ;#MB7A  
  // Generated message map functions i!~'M;S  
  //{{AFX_MSG(CCaptureDlg) iE.-FZc  
  virtual BOOL OnInitDialog(); Qo =Kqv  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _p?s9&  
  afx_msg void OnPaint(); `c+/q2M  
  afx_msg HCURSOR OnQueryDragIcon(); +u'I0>)S  
  virtual void OnCancel(); saD-D2oj  
  afx_msg void OnAbout(); h3gWOU  
  afx_msg void OnBrowse(); KS*oxZ  
  afx_msg void OnChange(); E| :!Q8"%w  
 //}}AFX_MSG dC}`IR  
 DECLARE_MESSAGE_MAP() k'_ P 7  
}; abxDB  
#endif %PJhy2  
2u?zO7W)-L  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1nPZ<^A&@  
#include "stdafx.h" UofTll)  
#include "Capture.h" Q:6VYONN  
#include "CaptureDlg.h" 8[ry |J  
#include <windowsx.h> YDmWN#  
#pragma comment(lib,"hook.lib") A"Q@W<.  
#ifdef _DEBUG 4e9q`~ sO  
#define new DEBUG_NEW Tp<k<uKD  
#undef THIS_FILE l2hG$idC  
static char THIS_FILE[] = __FILE__;  8RwX=  
#endif ji+{ :D  
#define IDM_SHELL WM_USER+1 VhEMk\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ngi<v6i  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @;wzsh >o  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; r+<{S\ Q  
class CAboutDlg : public CDialog 8Z85D  
{ 6ri\>QrF  
 public: /)uM[ dnai  
  CAboutDlg(); 0"[`>K~7a8  
  // Dialog Data +pqM ^3t|y  
  //{{AFX_DATA(CAboutDlg) 5, b]V)4  
  enum { IDD = IDD_ABOUTBOX }; *Zd84wRSj  
  //}}AFX_DATA `Iy4=nVb  
  // ClassWizard generated virtual function overrides j?n+>/sG,  
  //{{AFX_VIRTUAL(CAboutDlg) 0'$p$K  
 protected: b4,jN~ci  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ZI ?W5ISdg  
  //}}AFX_VIRTUAL klWYuStZ  
  // Implementation m(sXk}e;1  
 protected: fMK#x\.4  
  //{{AFX_MSG(CAboutDlg) Uz8hANN0_  
  //}}AFX_MSG MmU%%2QG  
  DECLARE_MESSAGE_MAP() k4KHS<n0  
}; Zzd/K^gg  
dYOF2si~%  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) <xS=#  
{ :h";c"  
 //{{AFX_DATA_INIT(CAboutDlg) 7el<5chZ  
 //}}AFX_DATA_INIT >R,?hWT  
} E1>/R  
S-E++f9D~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,&a`d}g&G  
{ }WP-W  
 CDialog::DoDataExchange(pDX); c 8'Cq7  
 //{{AFX_DATA_MAP(CAboutDlg) tGqCt9;<  
 //}}AFX_DATA_MAP !eD+GDgE]  
} ehO:')XF  
Go+[uY^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _GbE ^  
 //{{AFX_MSG_MAP(CAboutDlg) @Y' I,e  
 // No message handlers S6 }QFx  
 //}}AFX_MSG_MAP |PM m?2^R  
END_MESSAGE_MAP() u2qV6/  
oK-!(1A-  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 8@7AE"  
: CDialog(CCaptureDlg::IDD, pParent) <]#o*_aFP  
{ B/YcSEY;  
 //{{AFX_DATA_INIT(CCaptureDlg) |"}4*V_*  
  m_bControl = FALSE; }]h \/,  
  m_bAlt = FALSE; %RFYm  
  m_bShift = FALSE; $N.`)S<  
  m_Path = _T("c:\\"); -Z?Ck!00  
  m_Number = _T("0 picture captured."); 3&J&^O  
  nCount=0; $Qq_qTJu?G  
  bRegistered=FALSE; -^fzsBL.  
  bTray=FALSE; nu 7lh6o=  
 //}}AFX_DATA_INIT u:4["ViC  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 c/$*%J<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :`<psvd  
} Oc-u=K,B  
+{&+L0DfH~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) EX 9Z{xX  
{ 4_< nQ9K  
 CDialog::DoDataExchange(pDX); RSH/l;ii  
 //{{AFX_DATA_MAP(CCaptureDlg) .;%q/hP  
  DDX_Control(pDX, IDC_KEY, m_Key); FU]4oKx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); a2 >[0_E  
  DDX_Check(pDX, IDC_ALT, m_bAlt); B "n`|;r5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $eCGez<E  
  DDX_Text(pDX, IDC_PATH, m_Path); X<K9L7/*  
  DDX_Text(pDX, IDC_NUMBER, m_Number); #J~Xv:LgD  
 //}}AFX_DATA_MAP  tJ1-DoU  
} foyB{6q8  
rys<-i(  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) S2}Z&X(  
//{{AFX_MSG_MAP(CCaptureDlg) qhwoV4@f  
 ON_WM_SYSCOMMAND() !Ud:?U  
 ON_WM_PAINT() K!7q!%Ju  
 ON_WM_QUERYDRAGICON() /yt7#!tm+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) uri*lC  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 7AeP Gr  
 ON_BN_CLICKED(ID_CHANGE, OnChange) zg7G^!PU  
//}}AFX_MSG_MAP 0&B:\  
END_MESSAGE_MAP() Ut':$l=  
wEK%T P4  
BOOL CCaptureDlg::OnInitDialog() aYBTrOdz  
{ l<n5gfJ  
 CDialog::OnInitDialog(); OT%V{hD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vh{9'vd3el  
 ASSERT(IDM_ABOUTBOX < 0xF000); (qj,GmcS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); i9y3PP)  
 if (pSysMenu != NULL) Wv NI=>  
 { /Bm#`?(ia  
  CString strAboutMenu; 3~:0?Zuq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ,y%ziay  
  if (!strAboutMenu.IsEmpty()) QK'`=MU  
  { uX98iJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); 0 S2v"(_T  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); |a>}9:g,=*  
  } p}&Md-$1  
 } S$\.4*_H\  
 SetIcon(m_hIcon, TRUE); // Set big icon SF"#\{cjj  
 SetIcon(m_hIcon, FALSE); // Set small icon @kz!{g]Sn  
 m_Key.SetCurSel(0); Nr%(2[$ =  
 RegisterHotkey(); "0b?+ 3_{G  
 CMenu* pMenu=GetSystemMenu(FALSE); `,Xb8^M2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); prwC>LE  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); RrKfTiK H  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Q%I#{+OT  
 return TRUE; // return TRUE unless you set the focus to a control ?Q;kZmQl  
} ^DzL$BX  
A3z/Bz4]:#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &ad Y  
{ W  _J&M4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0hFH^2%UY  
 { wZ$ tJQO  
  CAboutDlg dlgAbout; 6NzBpur 2H  
  dlgAbout.DoModal(); 2YE7 23H=Z  
 } =l_rAj~I|  
 else [gpOu TW  
 { E2kW=6VO>|  
  CDialog::OnSysCommand(nID, lParam); {K<uM'ww>  
 } L+8=P<]  
} 8^8>qSD1  
d3Y(SPO  
void CCaptureDlg::OnPaint() .\Ul!&y  
{ kJI3`gS+  
 if (IsIconic()) u1tq2"D8  
 { |3S'8Oe CI  
  CPaintDC dc(this); // device context for painting 0{-`Th+h  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {d^Q7A:`  
  // Center icon in client rectangle x)j/  
  int cxIcon = GetSystemMetrics(SM_CXICON); kxygf9I!;  
  int cyIcon = GetSystemMetrics(SM_CYICON); {a]pF.^kf  
  CRect rect; =x=1uXQv5  
  GetClientRect(&rect); Z "-ntx#  
  int x = (rect.Width() - cxIcon + 1) / 2; zpbcmQB*  
  int y = (rect.Height() - cyIcon + 1) / 2; 2dXU0095  
  // Draw the icon `E{;85bDH  
  dc.DrawIcon(x, y, m_hIcon); ,c@r` x  
 } ?E%U|(S)=L  
 else N )'8o}E  
 { -Uzc"Lx B  
  CDialog::OnPaint(); +Y^-e.UO  
 } MhHr*!N"}  
} Uc\|X;nkRk  
L& I` #  
HCURSOR CCaptureDlg::OnQueryDragIcon() fB_4f{E  
{ GEhdk]<a7  
 return (HCURSOR) m_hIcon; ^Yf3"D?&  
} ,D:iQDG^  
`kqT{fs  
void CCaptureDlg::OnCancel() Y*`:M(  
{ ?nB he lW^  
 if(bTray) ;n3uV`\  
  DeleteIcon(); <dq,y>  
  CDialog::OnCancel(); \#uqD\DE  
} YnKFcEJrT  
`DI{wqV9  
void CCaptureDlg::OnAbout() ^fA3<|  
{ }W- K  
 CAboutDlg dlg; +<'uw  
 dlg.DoModal(); {fAh@:{@  
} 9QX&7cs&[  
EZ:I$X  
void CCaptureDlg::OnBrowse() B=Xnv*e  
{ mJwv&E  
 CString str; Ytl:YzXCi  
 BROWSEINFO bi; y&n1 Nj]^  
 char name[MAX_PATH]; 3c1o,2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #]?,gwvTf  
 bi.hwndOwner=GetSafeHwnd(); {. s]\C  
 bi.pszDisplayName=name; ,2=UuW"K  
 bi.lpszTitle="Select folder"; @/_XS4  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,\|n=T,  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^% ~Et>C  
 if(idl==NULL) D]t~S1ycG7  
  return; *T.={>HE8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h#(.(d  
 str.ReleaseBuffer(); d+gk q\  
 m_Path=str; U p]VU9z  
 if(str.GetAt(str.GetLength()-1)!='\\') o`<h=+a\  
  m_Path+="\\"; kcg)_]~6  
 UpdateData(FALSE); |YG)NO  
} ')C _An>X6  
i~v@  
void CCaptureDlg::SaveBmp() htdn$kqG   
{ 9*G L@_c  
 CDC dc; !Szgph"ul  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); M]8eW  
 CBitmap bm; +1JZB* W  
 int Width=GetSystemMetrics(SM_CXSCREEN); Apw-7*/  
 int Height=GetSystemMetrics(SM_CYSCREEN); !5g)3St  
 bm.CreateCompatibleBitmap(&dc,Width,Height); IkE'_F  
 CDC tdc; t<KEx^gb  
 tdc.CreateCompatibleDC(&dc); K8Kz  
 CBitmap*pOld=tdc.SelectObject(&bm); K'{wncumQ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); o'= [<  
 tdc.SelectObject(pOld); hc@;}a\Y  
 BITMAP btm; d-A%ZAkE]  
 bm.GetBitmap(&btm); 8TM=AV  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^hTJp{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); x{w?X.Nt  
 BITMAPINFOHEADER bih; DWO:  
 bih.biBitCount=btm.bmBitsPixel; $e,!fB;B  
 bih.biClrImportant=0; d:ajD  
 bih.biClrUsed=0; n_ gB#L$  
 bih.biCompression=0; U-:Z ^+Y  
 bih.biHeight=btm.bmHeight; k3eN;3#&  
 bih.biPlanes=1; {?_)m/\  
 bih.biSize=sizeof(BITMAPINFOHEADER); JVYYwA^ .  
 bih.biSizeImage=size; c_=zd6 b$S  
 bih.biWidth=btm.bmWidth; lY,1 w  
 bih.biXPelsPerMeter=0; ;qQzF  
 bih.biYPelsPerMeter=0; 7q=xW6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =?x=CEW  
 static int filecount=0; ImW~Jy  
 CString name; }tq9 /\  
 name.Format("pict%04d.bmp",filecount++); 6<O]_HZ&  
 name=m_Path+name; ?XrTZ{5'  
 BITMAPFILEHEADER bfh; vUExS Z^  
 bfh.bfReserved1=bfh.bfReserved2=0; X~b+LG/  
 bfh.bfType=((WORD)('M'<< 8)|'B'); uv d>  
 bfh.bfSize=54+size; FV,SA3  
 bfh.bfOffBits=54; AE~}^(G`  
 CFile bf; :36^^Wm  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ !y0 O['7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ou4?`JF)-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); At:C4>HE@  
  bf.WriteHuge(lpData,size); _JB3+0@  
  bf.Close(); WJ,ON-v  
  nCount++; $9$NX/P  
 } o*8 pM`uw  
 GlobalFreePtr(lpData); AX?6Q4Gq1  
 if(nCount==1) J> |`  
  m_Number.Format("%d picture captured.",nCount); fR{7780WZ  
 else X^)5O>>|t  
  m_Number.Format("%d pictures captured.",nCount); Q4 S8NqE  
  UpdateData(FALSE); an@Ue7  
} m#P&Yd4T  
P]^] T}5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ; #  
{ YzVLa,[  
 if(pMsg -> message == WM_KEYDOWN) OC.@C}u  
 { w?"l4.E%  
  if(pMsg -> wParam == VK_ESCAPE) ^hJ ,1{o  
   return TRUE; T9yW# .  
  if(pMsg -> wParam == VK_RETURN) X[}%iEWzT  
   return TRUE; MR: {Ps&,  
 } ;anG F0x  
 return CDialog::PreTranslateMessage(pMsg); $Vh82Id^  
} 9wzYDKN}  
+g&W423k_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) v'=APl+_  
{ n9yxZu   
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ L|Iq#QX|  
  SaveBmp(); &,xM;8b  
  return FALSE; vhW '2<(  
} c+c^F/  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ h !1c(UR  
 CMenu pop; jXQ_7  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 3lqhjA  
 CMenu*pMenu=pop.GetSubMenu(0); ,v+SD\7|  
 pMenu->SetDefaultItem(ID_EXITICON); J0k~%   
 CPoint pt; 6=k^gH[g  
 GetCursorPos(&pt); W\ckt]'  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y{<7OTA)  
 if(id==ID_EXITICON) 9"e!0Q40  
  DeleteIcon(); [%pZM.jFO  
 else if(id==ID_EXIT) +gkB  
  OnCancel(); P!/8   
 return FALSE; 4$rO,W/&0  
} QK\z-'&n  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); o/xE O=AW  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~F-,Q_|-  
 AddIcon(); ()Z$j,2  
 return res; - U|4`{PP  
} RXDk8)^  
C*$/J\6xy  
void CCaptureDlg::AddIcon() #"|Ey6&  
{ G(- `FH  
 NOTIFYICONDATA data; \a#2Wm  
 data.cbSize=sizeof(NOTIFYICONDATA); 9bB~r[k  
 CString tip; MD,-<X)Qy  
 tip.LoadString(IDS_ICONTIP); ROS0Q9X  
 data.hIcon=GetIcon(0); K"D9.%7  
 data.hWnd=GetSafeHwnd(); bF.Aj8ZQ  
 strcpy(data.szTip,tip); 8{RiaF8  
 data.uCallbackMessage=IDM_SHELL; \Z$*8z=  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; eP)RP6ON{  
 data.uID=98; 86i =N _  
 Shell_NotifyIcon(NIM_ADD,&data); _> *"6  
 ShowWindow(SW_HIDE); $I'ES#8P6  
 bTray=TRUE; ? DPL7  
} #KIHq2:.4  
q#Bdq8  
void CCaptureDlg::DeleteIcon() b(yY.L=K  
{ /1Eg6hf9B  
 NOTIFYICONDATA data; B\Uj  
 data.cbSize=sizeof(NOTIFYICONDATA); "}n]0 >J  
 data.hWnd=GetSafeHwnd(); }*%%GPJ  
 data.uID=98; TCVJ[LbJ  
 Shell_NotifyIcon(NIM_DELETE,&data); ;3w W)gL1  
 ShowWindow(SW_SHOW); xN5}y3  
 SetForegroundWindow(); t((0]j^  
 ShowWindow(SW_SHOWNORMAL); )Z62xK2  
 bTray=FALSE; OlP#|x*  
} 6wGf47  
wDsEx!\#  
void CCaptureDlg::OnChange() Y!5-WX H  
{ Zffzyh  
 RegisterHotkey(); Z'\_YbB  
} de"*<+  
d+_qBp  
BOOL CCaptureDlg::RegisterHotkey() yJ^}uw  
{ WPPmh~:  
 UpdateData(); qLR)>$  
 UCHAR mask=0; !Ed';yfz\(  
 UCHAR key=0; >Zr`9$i  
 if(m_bControl) v8LKv`I's  
  mask|=4; _ ZJP]5  
 if(m_bAlt) n04Zji(F@  
  mask|=2; 8 }-"&-X  
 if(m_bShift) WKN\* N<  
  mask|=1; hp)3@&T  
  key=Key_Table[m_Key.GetCurSel()]; ;lP)  
 if(bRegistered){ 1:8ZS  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); "]sr4Jg=  
  bRegistered=FALSE; zgLm~  
 } P5[.2y_qM  
 cMask=mask; >]Y`-*vw&  
 cKey=key; xC|7"N^/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); $} ~:x_[  
 return bRegistered; s{gdTG6v`  
} -\>Xtix^-c  
4B) prQ3  
  四、小结 !bQ5CB  
zE<}_nA  
  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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