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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: 1;$XX#7o  
  XeI2 <=@%  
  一、实现方法 uL/wV~g  
ce\d35x!  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: 6XWNJb  
+_7a/3kh  
#pragma data_seg("shareddata") ad: qOm  
HHOOK hHook =NULL; //钩子句柄 ~gd#cL%  
UINT nHookCount =0; //挂接的程序数目 am]M2+,2Ip  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 (p%|F`  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,XO@ZBOM  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey \~hrS/$[$  
static int KeyCount =0; JLE&nbKS  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 WT ;2aS:  
#pragma data_seg() m>vwpRBOA  
wu.l-VmGp)  
  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。 ]!/U9"_e"B  
T%eBgseS  
  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: GP%V(HhN  
>8(i;)(3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +-<G(^  
cKey,UCHAR cMask) 9S|sTf  
{ H]/ ~ #a  
 BOOL bAdded=FALSE; !Ap5Uwd  
 for(int index=0;index<MAX_KEY;index++){ >)ekb7  
  if(hCallWnd[index]==0){ z,TH}s6  
   hCallWnd[index]=hWnd;  8${n}}  
   HotKey[index]=cKey; :'DyZy2Fd  
   HotKeyMask[index]=cMask; A O:F*%Q u  
   bAdded=TRUE; Qfn:5B]tI  
   KeyCount++; d%8n   
   break; <YU?1y?V  
  } @njNP^'Kx  
 } 2o?j{K  
 return bAdded; a*cWj }u  
} 0DicrnH8  
//删除热键 G]ek-[-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;gZ ^c]\  
{ S&!(h {O  
 BOOL bRemoved=FALSE; H d|p@$I  
 for(int index=0;index<MAX_KEY;index++){ s>J5.Z7"'j  
  if(hCallWnd[index]==hWnd){ *-9i<@|(U^  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ r/sSkF F  
    hCallWnd[index]=NULL; %P0  
    HotKey[index]=0; K ";Et  
    HotKeyMask[index]=0;  +|LM"  
    bRemoved=TRUE; O-V|=t  
    KeyCount--; qk<jvha  
    break; zTa5 N  
   } &4-;;h\H  
  } f5V-;  
 } _^BA;S @  
 return bRemoved; 0>od1/`  
} N#ggT9>X  
T aS1%(  
'SXHq>#gA  
  DLL中的钩子函数如下: >aAM&4  
,\6Vb*G|E>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2f[;U"  
{ q-`&C  
 BOOL bProcessed=FALSE; G(7%*@SX  
 if(HC_ACTION==nCode) qofAA!3z  
 { s\;/U|P_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 k' st^1T  
   switch(wParam) lKsn6c,]  
   {  XkA] 9,@  
    case VK_MENU: QCb D^  
     MaskBits&=~ALTBIT; ]Ucw&B* @  
     break; a?-&O$UHf\  
    case VK_CONTROL: `6~0W5  
     MaskBits&=~CTRLBIT; ..JRtuM-v  
     break; 9O 'j+?(`@  
    case VK_SHIFT: ,m{R m0  
     MaskBits&=~SHIFTBIT; D./{f8  
     break; F@?-^ E@  
    default: //judge the key and send message 3:iEt (iCI  
     break; H7Q$k4\l  
   } R,BJr y  
   for(int index=0;index<MAX_KEY;index++){ a^%)6E.[,  
    if(hCallWnd[index]==NULL) <[[yV  
     continue; x@OBGKV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) osXEzr(  
    { $9X+dvu*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;5ki$)v"  
     bProcessed=TRUE; t$$YiO  
    } "K(cDVQ  
   } k ;^$Pd?t  
  } c-k3<|H`  
  else if((lParam&0xc000ffff)==1){ //有键按下 GURiW42  
   switch(wParam) )g'J'_Sl  
   { C][$0  
    case VK_MENU: K) }1;  
     MaskBits|=ALTBIT; 8NfXYR#  
     break; 'JOCL0FP  
    case VK_CONTROL: e6taQz@}  
     MaskBits|=CTRLBIT; ;<M}ZL@m  
     break; "%Ok3Rvv  
    case VK_SHIFT: cANt7  
     MaskBits|=SHIFTBIT; Tow=B  
     break; Q` &#u#  
    default: //judge the key and send message Kzrd<h]`)  
     break; 1L!;lP2  
   } r,JQR)l0@V  
   for(int index=0;index<MAX_KEY;index++){ u1 Q;M`+>  
    if(hCallWnd[index]==NULL) tBGLEeL/.  
     continue; v/ N[)<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |N`0G.#  
    { (?Mn_FNE|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); b1?^9c#0d  
     bProcessed=TRUE; _-C/s p^   
    } lMFo)4&P  
   } Wo "s;Z  
  } 684& H8  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 HXU#Ux  
   for(int index=0;index<MAX_KEY;index++){ kf'(u..G  
    if(hCallWnd[index]==NULL) {N}az"T4f  
     continue; ?xqS#^Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W^8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); DP),~8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]R""L<K%HF  
   } $_F_%m"\  
  } 2 H%lN`  
 } TBt5Nqks-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .jD!+wv{9  
} ;D~#|CB  
t}k:wzZ@  
  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: `/[5/%  
BSMb(EnqX  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q%x i>H.:{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); inU5eronuj  
)>1}I_1j)  
  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: ]B )nN':  
znE1t%V  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {j$2=0Cec  
{ 7nT|yL?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^<!R%"o-  
 { /C8}5)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 _]*YSeh=  
  SaveBmp();  lPZ>#  
  return FALSE; +\Vw:~e  
 } 1|{s8[;8  
 …… //其它处理及默认处理 T!]rdN!  
} b[:,p?:@  
KNmU2-%l  
rY(7IX  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 <5G(Y#s/?  
B]tj0FB`-*  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 `T*Y1@FV  
)tBz=hy#  
  二、编程步骤  7V5c`:"  
!AXLoq$SY  
  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"; [KBa=3>{  
F?'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; R{c~jjd  
9@CRL=  
  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; [KR%8[e  
ZY8.p  
  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; 'nPI zK<v  
y]t19G+  
  5、 添加代码,编译运行程序。 rSv,;v  
9^DAlY,x.  
三、程序代码 t#(=$  
]0T*#U/P  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Q   
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ze>R@rK  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ }IWt\a<d  
#if _MSC_VER > 1000 lZRO"[<  
#pragma once mTsyVji8  
#endif // _MSC_VER > 1000 Iq%<E:+GL  
#ifndef __AFXWIN_H__ cEa8l~GC<  
#error include 'stdafx.h' before including this file for PCH P<X?  
#endif - c>Vw&1  
#include "resource.h" // main symbols m19\H  
class CHookApp : public CWinApp \%r0'1f  
{ mC@v,"  
 public: Ws5N|g  
  CHookApp();  ;@k=9o]A  
  // Overrides z&0[F`U  
  // ClassWizard generated virtual function overrides rZwSo]gp  
  //{{AFX_VIRTUAL(CHookApp) >{ {ds--  
 public: P7W|e~]Yq  
  virtual BOOL InitInstance(); c`x4."m  
  virtual int ExitInstance(); o]tfvGvU*  
  //}}AFX_VIRTUAL hN K wQ  
  //{{AFX_MSG(CHookApp) 3.Mpd  
  // NOTE - the ClassWizard will add and remove member functions here. <D:q4t  
  // DO NOT EDIT what you see in these blocks of generated code ! PeIi@0vA  
  //}}AFX_MSG w=?nD6Xhz  
  DECLARE_MESSAGE_MAP() !pU^?Hy=  
}; - q9m@!L  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); OcMB)1uh\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /-!Fr:Ox>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); evZP*N~G  
BOOL InitHotkey(); xU%]G .k  
BOOL UnInit(); %6@)fRw  
#endif uQbag]&j  
N`7OJ)l  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. clyp0`,7  
#include "stdafx.h" CvRCcSJM\2  
#include "hook.h" 8J&9}@y  
#include <windowsx.h> >{(c\oMD  
#ifdef _DEBUG a ub$4n!C9  
#define new DEBUG_NEW 3/usgw1  
#undef THIS_FILE %JPr 7 }  
static char THIS_FILE[] = __FILE__; n~ $S  
#endif j<)$ [v6  
#define MAX_KEY 100 !wE% <Fh  
#define CTRLBIT 0x04 d~_5Jx  
#define ALTBIT 0x02 {?^ES*5  
#define SHIFTBIT 0x01 SJ22  
#pragma data_seg("shareddata") B>'J5bZsw  
HHOOK hHook =NULL; < ~CY?  
UINT nHookCount =0; jqvw<+#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  ^F?B_'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT K!(WcoA&2i  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Z%ZOAu&p  
static int KeyCount =0;  :Kyr}-  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift B QUYT/$(  
#pragma data_seg() [7x;H  
HINSTANCE hins; Y:+:>[F  
void VerifyWindow(); HQ=pf >  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) cEp/qzAiD%  
//{{AFX_MSG_MAP(CHookApp) g3vbskY|  
// NOTE - the ClassWizard will add and remove mapping macros here. k}kwr[  
// DO NOT EDIT what you see in these blocks of generated code! 7o+VhW<|5  
//}}AFX_MSG_MAP QHje}  
END_MESSAGE_MAP() ?5Z-w  
s$9ow<oi]  
CHookApp::CHookApp() 0V8G9Gj  
{ 7 v3%dCvf  
 // TODO: add construction code here, /^{Q(R(X<  
 // Place all significant initialization in InitInstance >d .|I&  
} +NB5Fd4  
n|=yw6aV'  
CHookApp theApp; 4;H m%20g  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) # 6?2 2Os  
{ ]+^4Yq>2  
 BOOL bProcessed=FALSE; uGlz|C  
 if(HC_ACTION==nCode) Lrx"Hn{  
 { Nt<Ac&6 s  
  if((lParam&0xc0000000)==0xc0000000){// Key up Z'^.H3YvL  
   switch(wParam) -jTK3&5  
   { {![E)~  
    case VK_MENU: xU.Ymq& 5  
     MaskBits&=~ALTBIT; \q-["W34  
     break; {iLr$ 89  
    case VK_CONTROL: '+^XL6$L  
     MaskBits&=~CTRLBIT; kmfz.:j{  
     break; /oM&29 jy  
    case VK_SHIFT: CS"k0V44}  
     MaskBits&=~SHIFTBIT; |@>Zc5MY$  
     break; #eI` l`}  
    default: //judge the key and send message }2?-kj7  
     break; [S`Fm>,  
   } xdsF! Zb  
   for(int index=0;index<MAX_KEY;index++){ %%O_:@9x,  
    if(hCallWnd[index]==NULL) sD XJXJZ  
     continue; x4_FG{AIu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8=sMmpB 7u  
    { fV/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); | -AR)Smt  
     bProcessed=TRUE; );F /P0P  
    } yF&?gPh&  
   } N aiZU  
  } w\.z-6G  
  else if((lParam&0xc000ffff)==1){ //Key down f9E.X\"  
   switch(wParam) e-{4qt  
   { 2ld0w=?+eu  
    case VK_MENU: j~9,Ct  
     MaskBits|=ALTBIT; QN m.8c$  
     break; pK2n'4 C  
    case VK_CONTROL: [Hp"a^~r|  
     MaskBits|=CTRLBIT; myY@Wp  
     break; POUD*(DqNK  
    case VK_SHIFT: (V~PYf%  
     MaskBits|=SHIFTBIT; i_;]UvP  
     break; aib)ItNb  
    default: //judge the key and send message %8GY`T:^  
     break; $y*[" ~TJ  
   } xSHeP`P^X  
   for(int index=0;index<MAX_KEY;index++) "Q@ZS2;A  
   { B\!.o=<h  
    if(hCallWnd[index]==NULL) .!J,9PE  
     continue; NCysYmt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Z)zmT%t  
    { [P_1a`b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 7e-l`]  
     bProcessed=TRUE; APksY!  
    } NLxsxomj  
   } ztS'Dp}q<  
  }  Dy@f21+  
  if(!bProcessed){ ojH-;|f  
   for(int index=0;index<MAX_KEY;index++){ VXAgp6  
    if(hCallWnd[index]==NULL) az]S&\i7T  
     continue; #_bSWV4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S)*eAON9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); M -df Gk  
   } }A"%YDrNbG  
  } AcYL3  
 } Gx GZxf*(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); r`L$[C5I  
} ~l@SGHx  
`_'I 9,.a  
BOOL InitHotkey() ~WJEH#  
{ |f~p3KCfV  
 if(hHook!=NULL){  3y?ig2  
  nHookCount++; f&Bu_r  
  return TRUE; p' FYK|  
 } (v^L2Po  
 else *r+i=i8{  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); X] /r'Tz  
  if(hHook!=NULL) %fpcH  
   nHookCount++; @&]j[if (s  
  return (hHook!=NULL); j%KLp4J/e  
} dHnId2@#  
BOOL UnInit() QP?Z+P<  
{ c]W]m`:  
 if(nHookCount>1){ E#T-2^nD  
  nHookCount--; LRv-q{jP;  
  return TRUE; R gEKs"e  
 } vpUS(ztvs  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 'wX'}3_/g  
 if(unhooked==TRUE){ d3(T=9;f2  
  nHookCount=0; lFD$ Mc  
  hHook=NULL; 0@t/j<5o  
 } '@Y@H,  
 return unhooked; 3 $Uv  
} .Lp0_R@  
Xt/muV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) R{+ Rvk  
{ lBL;aTzo  
 BOOL bAdded=FALSE; h8O[xca/~  
 for(int index=0;index<MAX_KEY;index++){ t}`|\*a  
  if(hCallWnd[index]==0){ Y'Jb@l`$-  
   hCallWnd[index]=hWnd; 6pQ#Zg()vp  
   HotKey[index]=cKey; ' d1E~A  
   HotKeyMask[index]=cMask; 9+SeG\Th  
   bAdded=TRUE; `96:Z-!}  
   KeyCount++; zie])_8|h  
   break; U\ y?P:yy  
  } HH2*12e  
 } +?(2-RBd  
 return bAdded; ;vF8V`f   
} v)+wr[Qs  
lb&tAl"D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) RWXj)H)w  
{ &H,j .~a&l  
 BOOL bRemoved=FALSE; #* S0d1  
 for(int index=0;index<MAX_KEY;index++){ OgS6#X  
  if(hCallWnd[index]==hWnd){ Nd#t !=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IJ o`O  
    hCallWnd[index]=NULL; }vxb, [#  
    HotKey[index]=0; netKt_  
    HotKeyMask[index]=0; i?'HVx  
    bRemoved=TRUE; M,t8<y4 W/  
    KeyCount--; djPr 4Nog  
    break; rNqJL_!  
   } =q^o6{d0"  
  } %7O`]ik:  
 } R?>a UFM  
 return bRemoved; r1-?mMSU&  
} \"_;rJ{!aE  
} ~=53$+  
void VerifyWindow() ]BP/KCjAI<  
{ X5qU>'?`  
 for(int i=0;i<MAX_KEY;i++){ \H<'W"  
  if(hCallWnd!=NULL){ Fmt5"3B  
   if(!IsWindow(hCallWnd)){ mv SNKS  
    hCallWnd=NULL; !o:RIwS3  
    HotKey=0; 2j4VW0:  
    HotKeyMask=0; {;Mcor3  
    KeyCount--; idPkJf/  
   } RE oFP;H~  
  } QCa$<~c  
 } !F;W#Gc  
} )`-9WCd&  
KTBsH;6  
BOOL CHookApp::InitInstance() 9:fVHynr  
{ (LTm!"Q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); }/(fe`7:  
 hins=AfxGetInstanceHandle(); #R305  
 InitHotkey(); )f(#Fn  
 return CWinApp::InitInstance(); n|SsV  
} f Nm Sx  
` B : Ydf  
int CHookApp::ExitInstance() ~e~4S~{  
{ q^( [ & +  
 VerifyWindow(); Z\(+awv  
 UnInit(); Q++lgVh)E  
 return CWinApp::ExitInstance(); jp=^$rS6[  
} 2Ev~[Hb.  
yew9bn0a=  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 1f~unb\Gg  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) i)+@'!6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ct|iZLh`j  
#if _MSC_VER > 1000 1W$@ V!  
#pragma once P9G c)$6{p  
#endif // _MSC_VER > 1000 Xv]O1fcI  
;[ pyKh  
class CCaptureDlg : public CDialog :f 1*-y  
{ E2LpQNvN%g  
 // Construction db@i*Bf  
 public: rzLpVpTaz  
  BOOL bTray; r*&gd|sn  
  BOOL bRegistered; J6n@|L!yO  
  BOOL RegisterHotkey(); [,8@oM#  
  UCHAR cKey; la</IpC  
  UCHAR cMask; jXSo{  
  void DeleteIcon(); :nC Gqg  
  void AddIcon(); ] 8+!  
  UINT nCount; }_@*,  
  void SaveBmp(); +Z/ *=;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  pzg|?U  
  // Dialog Data rNO'0Ck=  
  //{{AFX_DATA(CCaptureDlg) PUuxKW}  
  enum { IDD = IDD_CAPTURE_DIALOG }; }NMA($@A  
  CComboBox m_Key; W[AX?  
  BOOL m_bControl; ;v^tUyhCb  
  BOOL m_bAlt; 1 }Tbp_  
  BOOL m_bShift; <wW#Wnc]  
  CString m_Path; A Ns.`S  
  CString m_Number; \5_+6  
  //}}AFX_DATA Ew*_@hVC  
  // ClassWizard generated virtual function overrides V\W?@V9g-  
  //{{AFX_VIRTUAL(CCaptureDlg) *Cz>r}W  
 public: }JeGjpAcV  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M/EEoK^K@  
 protected: Nv,1F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support aqQ YU5l4~  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); -+Axa[,5=  
  //}}AFX_VIRTUAL -y5^xR  
  // Implementation 9E'fM  
 protected: (+`pEDD{X  
  HICON m_hIcon; Q>8F&p?R  
  // Generated message map functions $A;jl`ng  
  //{{AFX_MSG(CCaptureDlg) DJVH}w}9_P  
  virtual BOOL OnInitDialog(); )a AKO`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); N7Kq$G2O  
  afx_msg void OnPaint(); 4zkn~oy  
  afx_msg HCURSOR OnQueryDragIcon(); 9t:F![rg  
  virtual void OnCancel(); 48hu=,)81*  
  afx_msg void OnAbout(); t~U:Ea[gd  
  afx_msg void OnBrowse(); VG0Ty;bV  
  afx_msg void OnChange(); m \o<a|  
 //}}AFX_MSG ZJ}9g(X..g  
 DECLARE_MESSAGE_MAP() Yz(k4K L  
}; H .*:+  
#endif gqV66xmJ3  
!~Gx@Ro  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \X.CYkgK  
#include "stdafx.h" Dk8 O*B   
#include "Capture.h" @ol=gBU  
#include "CaptureDlg.h" O#LG$Y n*  
#include <windowsx.h> &|yQwNA*a"  
#pragma comment(lib,"hook.lib") 8,B?!%FP  
#ifdef _DEBUG W!vN (1:(  
#define new DEBUG_NEW ,)/gy)~#  
#undef THIS_FILE /kV3[Rw+  
static char THIS_FILE[] = __FILE__; 2-!OflkoM0  
#endif `EKmp|B_p_  
#define IDM_SHELL WM_USER+1 b3R1L|@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wpgO09  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8Na.H::cZ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; V`P8oIOh]  
class CAboutDlg : public CDialog ^*s DJ #  
{ YnM&t ;TX  
 public: H<_BnT #  
  CAboutDlg(); `9;0Y  
  // Dialog Data A*+pGQ  
  //{{AFX_DATA(CAboutDlg) Lx%*IE|c  
  enum { IDD = IDD_ABOUTBOX }; +cH,2^&  
  //}}AFX_DATA y8*MNw  
  // ClassWizard generated virtual function overrides d}D%%noIu  
  //{{AFX_VIRTUAL(CAboutDlg) (=A61]yB  
 protected: LR:PSgy  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support MB7UI8  
  //}}AFX_VIRTUAL 6HroKu  
  // Implementation w8=&rzr8  
 protected: nm"]q`(K  
  //{{AFX_MSG(CAboutDlg) o<h2]TN  
  //}}AFX_MSG CzMCd ~*7R  
  DECLARE_MESSAGE_MAP() 4X-"yQ<U  
}; rX7GVg@H  
Lql2ry$Wa  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6=cfr; BH2  
{ v~8Cp C  
 //{{AFX_DATA_INIT(CAboutDlg) }K .Rv(m  
 //}}AFX_DATA_INIT $>JfLSyC  
} mpr_AL!ZO~  
}b5omHUE%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R$XHjb)  
{ =Bg $OX  
 CDialog::DoDataExchange(pDX); 18^#:=Z  
 //{{AFX_DATA_MAP(CAboutDlg) *S xDwN  
 //}}AFX_DATA_MAP K}t=Y  
} e{EC# %x_  
o3"Nxq"U  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) %p48=|+  
 //{{AFX_MSG_MAP(CAboutDlg) vAh'6Ob7r  
 // No message handlers 3S5`I9I  
 //}}AFX_MSG_MAP F50l->F2&  
END_MESSAGE_MAP() mEm=SpO[$o  
Ypx5:gm|J  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) nt&"? /s  
: CDialog(CCaptureDlg::IDD, pParent) z!M #   
{ Y\,aJL$  
 //{{AFX_DATA_INIT(CCaptureDlg) xTU;rJV  
  m_bControl = FALSE; lfAiW;giJ  
  m_bAlt = FALSE; A"B#t"  
  m_bShift = FALSE; C'y4 ~7  
  m_Path = _T("c:\\"); nt]'>eX_}  
  m_Number = _T("0 picture captured."); E<ILZpP  
  nCount=0; f, '*f:(  
  bRegistered=FALSE; ZEp>~dn;  
  bTray=FALSE; |KR8=-!7  
 //}}AFX_DATA_INIT PNo9.-@G  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 O$nW  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); P BVF'~f@j  
} 28LBvJVq@  
%aI,K0\  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) k|czQ"vaI  
{ 5hHLC7tT9  
 CDialog::DoDataExchange(pDX); .=)[S5.BVq  
 //{{AFX_DATA_MAP(CCaptureDlg) !|W.YbS  
  DDX_Control(pDX, IDC_KEY, m_Key); >~0~h:M+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 2,Aw 6h;  
  DDX_Check(pDX, IDC_ALT, m_bAlt); oTRid G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); !F:mD ZeY  
  DDX_Text(pDX, IDC_PATH, m_Path); `W>Sss  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ;PB_ @Zg  
 //}}AFX_DATA_MAP F( 4Ue6R  
} PqIskv+  
id588Y78  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =:Yrb2gP_\  
//{{AFX_MSG_MAP(CCaptureDlg) I94-#*~I  
 ON_WM_SYSCOMMAND() a)4%sX*I  
 ON_WM_PAINT() :L{*B$c  
 ON_WM_QUERYDRAGICON() 1S(n3(KRk$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) #sg*GK+|:R  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) kS35X)-  
 ON_BN_CLICKED(ID_CHANGE, OnChange) t 9t '9  
//}}AFX_MSG_MAP bEB2q\|Je  
END_MESSAGE_MAP() J0 dY%pH#  
Y]=k"]:%  
BOOL CCaptureDlg::OnInitDialog() |VzXcV-"8)  
{ [mv!r-=  
 CDialog::OnInitDialog(); Yo1]HG(kXB  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 8{]nS8i  
 ASSERT(IDM_ABOUTBOX < 0xF000); 7x=4P|(\}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); CPL,QVO9  
 if (pSysMenu != NULL) ZqdoYU'  
 { "G-h8IN^O  
  CString strAboutMenu; 7AS_Aw1L  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {=\Fc`74  
  if (!strAboutMenu.IsEmpty()) ]v0Z[l>yf  
  { |AacV  
   pSysMenu->AppendMenu(MF_SEPARATOR); `|Hk+V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  VM:|I~gJ  
  } %.D!J",\/K  
 } Be6+YM5Cl  
 SetIcon(m_hIcon, TRUE); // Set big icon *sZH3:  
 SetIcon(m_hIcon, FALSE); // Set small icon -)B_o#2=2  
 m_Key.SetCurSel(0); _;U%`/T b  
 RegisterHotkey(); zfE8=d8U  
 CMenu* pMenu=GetSystemMenu(FALSE); Cl9rJ oT  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \ {]y(GT  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); f1v4h[)-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); -Ci&h  
 return TRUE; // return TRUE unless you set the focus to a control (hdu+^Qj=  
} }#u #m.  
~,oz hj0f/  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) P$0c{B4I  
{ a;^lOU|L{  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4xq|  
 { A6 .wXv,  
  CAboutDlg dlgAbout; : \qapFV  
  dlgAbout.DoModal(); x~R,rb   
 } +-(,'slov  
 else qB,0(I1-!  
 { fqY'Uq$=  
  CDialog::OnSysCommand(nID, lParam); ZZZ9C#hK^9  
 } )gSqO{Z  
} Osm))Ua(  
z'$1$~I  
void CCaptureDlg::OnPaint() GF8wKx#J  
{ G"E_4YkJ  
 if (IsIconic()) !&hqj$>-}  
 { CxjB9#  
  CPaintDC dc(this); // device context for painting <=&$+3r  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); =#[oi3k  
  // Center icon in client rectangle K)mQcB-"?  
  int cxIcon = GetSystemMetrics(SM_CXICON); r *6S1bW  
  int cyIcon = GetSystemMetrics(SM_CYICON); DE/SIy?  
  CRect rect; TUC)S&bC  
  GetClientRect(&rect); uO eal^uS  
  int x = (rect.Width() - cxIcon + 1) / 2; ^7gKs2M  
  int y = (rect.Height() - cyIcon + 1) / 2; W"_<SYVJ  
  // Draw the icon OVDuF&0  
  dc.DrawIcon(x, y, m_hIcon); S<Gm*$[7  
 } K_YOp1  
 else [V:~j1{3  
 { Z;81 "   
  CDialog::OnPaint(); \q1tT!]  
 } mu@J$\   
} bV&9>fC  
[ UI>SN  
HCURSOR CCaptureDlg::OnQueryDragIcon() Rh|9F yN  
{ `sT;\  
 return (HCURSOR) m_hIcon; G Ixs>E'X  
} *$-X&.h[  
{<gv1Yht  
void CCaptureDlg::OnCancel() `HQ)][  
{ $$NWN?H~  
 if(bTray) 2vjkThh`I  
  DeleteIcon();  )^{}ov  
  CDialog::OnCancel(); 8R3{YJ6@T  
} sb{K%xi%  
3;BIwb_  
void CCaptureDlg::OnAbout() * &:_Vgu  
{ W<pr Y  
 CAboutDlg dlg; /Rq\Mgb  
 dlg.DoModal(); '?veMX  
} Q*>)W{H&)  
ErK1j  
void CCaptureDlg::OnBrowse() /_qq(,3  
{ ;F"!$Z/  
 CString str; nTr%S&<+"  
 BROWSEINFO bi; p!YK~cH[  
 char name[MAX_PATH]; BjvQ6M{Y"+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); B-C$>H^  
 bi.hwndOwner=GetSafeHwnd(); <3B^5p\/  
 bi.pszDisplayName=name; |z=`Ur@)  
 bi.lpszTitle="Select folder"; e`qrafa  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Jh E C  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); <@ .e.H  
 if(idl==NULL) '2r  
  return; UGO;5!  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H:~p5t  
 str.ReleaseBuffer(); O0#[hY,  
 m_Path=str; J.1 c,@  
 if(str.GetAt(str.GetLength()-1)!='\\') >6 o <Q  
  m_Path+="\\"; 5eori8gr7  
 UpdateData(FALSE); ISpV={$Zd  
} :.*Q@X}-I  
-iDs:J4Iq  
void CCaptureDlg::SaveBmp() 7@;*e=v  
{ AhF@  
 CDC dc; |KYl'"5\  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); dA h cA.  
 CBitmap bm; lz0-5z+\  
 int Width=GetSystemMetrics(SM_CXSCREEN); );.$  `0  
 int Height=GetSystemMetrics(SM_CYSCREEN); 9xK>fM&u  
 bm.CreateCompatibleBitmap(&dc,Width,Height); PuP"( M  
 CDC tdc; k={D!4kKz  
 tdc.CreateCompatibleDC(&dc); ;-u]@35  
 CBitmap*pOld=tdc.SelectObject(&bm); qIZ+%ZOu  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .jQx2 O  
 tdc.SelectObject(pOld); %]LoR$|Y  
 BITMAP btm; < c^'$  
 bm.GetBitmap(&btm); _R\FB|_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; arm_SyL0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Bo "9;F  
 BITMAPINFOHEADER bih; [}4zqY{  
 bih.biBitCount=btm.bmBitsPixel; fxcE1=a  
 bih.biClrImportant=0; B9"o Ru^}  
 bih.biClrUsed=0; oT{9P?K8  
 bih.biCompression=0; \7LL neq  
 bih.biHeight=btm.bmHeight; ([q>.[WbH]  
 bih.biPlanes=1; |-=-/u1  
 bih.biSize=sizeof(BITMAPINFOHEADER); "QOQ  
 bih.biSizeImage=size; jo"nK,r  
 bih.biWidth=btm.bmWidth; bDvGFSAH  
 bih.biXPelsPerMeter=0; `?$-T5Rr  
 bih.biYPelsPerMeter=0; > V(C>^%->  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 55O}SUs!P  
 static int filecount=0; %_Vz0 D! 7  
 CString name; oi0O4J%H  
 name.Format("pict%04d.bmp",filecount++); wetu.aMp  
 name=m_Path+name; @TALZk'%  
 BITMAPFILEHEADER bfh; Ye On   
 bfh.bfReserved1=bfh.bfReserved2=0; U[pHT _U  
 bfh.bfType=((WORD)('M'<< 8)|'B'); K;"H$0 !9  
 bfh.bfSize=54+size; ;b [>{Q;  
 bfh.bfOffBits=54; c_qox  
 CFile bf; EN`JzL jP  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ X40gJV<  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); PNAvT$0LaZ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 5]*lH t  
  bf.WriteHuge(lpData,size); rrU(>jA!  
  bf.Close(); *m "@*O'  
  nCount++; <T7@,_T  
 } "#wAGlH6>  
 GlobalFreePtr(lpData); 2+pw%#fe  
 if(nCount==1) %t_'rv  
  m_Number.Format("%d picture captured.",nCount); waC i9  
 else *P *.'XM  
  m_Number.Format("%d pictures captured.",nCount); \_.'/<aQ  
  UpdateData(FALSE); TQeIAy  
} uvl91~&G  
53uptQ{   
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) aEdMZ+P.  
{ [uqr  
 if(pMsg -> message == WM_KEYDOWN) ;0_T\{H"nR  
 { tz65Tn_M  
  if(pMsg -> wParam == VK_ESCAPE) fX9b1x  
   return TRUE; Qq{tX  
  if(pMsg -> wParam == VK_RETURN) !(bYh`Uy  
   return TRUE; n\I s}Czl  
 } u^C\aujg  
 return CDialog::PreTranslateMessage(pMsg); j*8Ze!^  
} Usht\<{  
7oLlRU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) P `<TO   
{ ST#)Fl  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ mn1!A`$  
  SaveBmp(); q:>`|~MX  
  return FALSE; ++w{)Io Z  
} Nc6y]eGz  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 49/2E@G4.  
 CMenu pop; dh}"uM}a  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); $m>( kd1  
 CMenu*pMenu=pop.GetSubMenu(0); 56."&0  
 pMenu->SetDefaultItem(ID_EXITICON); ([JFX@  
 CPoint pt; %\v  
 GetCursorPos(&pt); G|?V}pZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d?U,}tv  
 if(id==ID_EXITICON) ! pa7]cZ  
  DeleteIcon(); tm34Z''.>  
 else if(id==ID_EXIT) /q]fG  
  OnCancel(); \8Ewl|"N:u  
 return FALSE; %LdBO1D0  
} brE%/%! e  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); "}uu-5]3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) WVyq$p/V  
 AddIcon(); ctb , w  
 return res; UHl1>(U  
} Pmuk !V}f  
y#ON=8l  
void CCaptureDlg::AddIcon() dg N #"  
{ B 4e}%  
 NOTIFYICONDATA data; ]~m=b` o  
 data.cbSize=sizeof(NOTIFYICONDATA); s0Y7`uD^  
 CString tip; \>/AF<2"  
 tip.LoadString(IDS_ICONTIP); |<YF.7r;  
 data.hIcon=GetIcon(0); } F*=+n  
 data.hWnd=GetSafeHwnd(); cJ,`71xop,  
 strcpy(data.szTip,tip);  9mv6  
 data.uCallbackMessage=IDM_SHELL; HRd02tah  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; fb]=MoiJ  
 data.uID=98; \Zk<|T61$  
 Shell_NotifyIcon(NIM_ADD,&data); ||Wg'$3  
 ShowWindow(SW_HIDE); ]G~u8HPH!m  
 bTray=TRUE; FZ% WD@=  
} :)Nk  
Gm\jboef]  
void CCaptureDlg::DeleteIcon() vns Mh  
{ 4,6?sTuX  
 NOTIFYICONDATA data; aOW~! f/M  
 data.cbSize=sizeof(NOTIFYICONDATA); tUFXx\p  
 data.hWnd=GetSafeHwnd(); ` \-m qe  
 data.uID=98; u bi6=  
 Shell_NotifyIcon(NIM_DELETE,&data); sr.!EQ]  
 ShowWindow(SW_SHOW); fVBu?<=d  
 SetForegroundWindow(); k*T&>$k}^  
 ShowWindow(SW_SHOWNORMAL); 6FI`0j=~  
 bTray=FALSE; !:dhK  
} QtqE&j  
B\7 80p<  
void CCaptureDlg::OnChange() rOq>jvy  
{ +?[iB"F  
 RegisterHotkey(); {$-\)K  
} w3oe.hWP3N  
H h;o<N>U  
BOOL CCaptureDlg::RegisterHotkey() T+<OlXpL  
{ (@u"   
 UpdateData(); =^3B&qQNq  
 UCHAR mask=0; y +c 3#  
 UCHAR key=0; )pt#Pu  
 if(m_bControl) ,HO@bCK  
  mask|=4; u*H V  
 if(m_bAlt) h]okY49hY  
  mask|=2; ]a=Bc~g91  
 if(m_bShift) 0Z~G:$O/i  
  mask|=1; &l1CE1 9<  
  key=Key_Table[m_Key.GetCurSel()]; 5-X(K 'Q  
 if(bRegistered){ #kDJ>r |&-  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Dmv@ljwO  
  bRegistered=FALSE; erZ%C <  
 } h/F,D_O>ZO  
 cMask=mask; naKB2y]l  
 cKey=key; ns1@=f cO  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); J#& C&S 2  
 return bRegistered; 'gwh:8Xc  
} .9;wJ9Bw[  
('.r_F  
  四、小结 eMC0 )B  
_-g?6q  
  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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