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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: \}e1\MiZ  
  Whq@>pX8  
  一、实现方法 !:mo2zA  
0VB~4NNR  
  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: +`x8[A)-  
Osdw\NNH~M  
#pragma data_seg("shareddata") QMfa~TH#p  
HHOOK hHook =NULL; //钩子句柄 [S/]Vk|4  
UINT nHookCount =0; //挂接的程序数目 r^k:$wJbRK  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5Qik{cWxBq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 6 /Apdn1[  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rnVh ]xJ  
static int KeyCount =0; #U NTD4   
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 TK;*:K8oe  
#pragma data_seg() T }X#I'Z  
+M6qbIO  
  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。 %Y` @>P'  
n@xDFa  
  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: qlSc[nEk  
q@p-)+D;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR u5 EHzoq  
cKey,UCHAR cMask) 2Ek6YNx  
{ 2hRaYX,g  
 BOOL bAdded=FALSE; \z<B=RT\  
 for(int index=0;index<MAX_KEY;index++){ v3+ \A q   
  if(hCallWnd[index]==0){ <m80e),~  
   hCallWnd[index]=hWnd; _n(NPFV  
   HotKey[index]=cKey; H85HL-{  
   HotKeyMask[index]=cMask; H\2+cAFN#  
   bAdded=TRUE; ~3.1. 'A  
   KeyCount++; I#kK! m1Q  
   break; ~n84x  
  } 0EYK3<k9!  
 } S ; x;FU  
 return bAdded; z.:{   
} JI}(R4uV  
//删除热键 Wr7^  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $LZf&q:\]*  
{ A:EF#2) g  
 BOOL bRemoved=FALSE; tZ[Y~],F  
 for(int index=0;index<MAX_KEY;index++){ PY.c$)az>  
  if(hCallWnd[index]==hWnd){ $Tt@Xu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8ltHR]v  
    hCallWnd[index]=NULL; AyKaazm]9  
    HotKey[index]=0; ](vsh gp2  
    HotKeyMask[index]=0; Z xLjh  
    bRemoved=TRUE; l,*v/95h  
    KeyCount--; =/" Of  
    break; rO/mK$  
   } >'/G:\M>A  
  } k=O2s'F`  
 } G|yX9C]R   
 return bRemoved; Mu18s}  
} glh2CRUj  
"';'*x  
zqqpBwk#  
  DLL中的钩子函数如下: 5,'?NEyw  
[SgP1>M  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r:y *l4  
{ 86~HkHliv  
 BOOL bProcessed=FALSE; /!UuGm   
 if(HC_ACTION==nCode) phUno2fH  
 { UnZ*"%  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }.7!@!q.  
   switch(wParam) 0%}$@H5i  
   {  2s;/*<WM  
    case VK_MENU: Y2j>lf?8  
     MaskBits&=~ALTBIT;  FZnkQ  
     break; O: sjf?z  
    case VK_CONTROL: YcGSZ0vQ  
     MaskBits&=~CTRLBIT; LGPy>,!  
     break; t(CdoE,6  
    case VK_SHIFT: 6z"fBF  
     MaskBits&=~SHIFTBIT; $GUSTV  
     break; XZA3T Z  
    default: //judge the key and send message fSl+;|K n  
     break; }#q9>gx  
   } *8U+2zgfC  
   for(int index=0;index<MAX_KEY;index++){ b/'fC%o,  
    if(hCallWnd[index]==NULL)  "=H7p3  
     continue; #;a 1=8H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UKQ ,]VC  
    { Fg?Gx(g4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); qI<6% ^i  
     bProcessed=TRUE; ,v$gQU2  
    } X}_}`wIn  
   } Q$W0>bUP  
  } U n2xZ[4  
  else if((lParam&0xc000ffff)==1){ //有键按下 JTpKF_Za<  
   switch(wParam) B @UaaWh  
   { TvAA  
    case VK_MENU: O$Wt\Y <q  
     MaskBits|=ALTBIT; G!oq ;<  
     break; YU[93@mCh  
    case VK_CONTROL: n<kcK  
     MaskBits|=CTRLBIT; t</rvAH E  
     break; `Qv7aY  
    case VK_SHIFT: ? 8S0  
     MaskBits|=SHIFTBIT; B>t$Z5Q^X  
     break; O:RPH{D  
    default: //judge the key and send message G[r_|-^S  
     break; 8=T;R&U^M  
   } pQ*9)C   
   for(int index=0;index<MAX_KEY;index++){ %]>c4"H  
    if(hCallWnd[index]==NULL) WhSQ>h!@s  
     continue; +XJj:%yt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u=jF\W9  
    { f/?# 1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vML01SAi  
     bProcessed=TRUE; f$iv+7<B^  
    } FsY}mql  
   } 6/T hbD-C  
  } R(=Lhz6R4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7h<Q{X<A  
   for(int index=0;index<MAX_KEY;index++){ 6~0S%Hz   
    if(hCallWnd[index]==NULL) Y1H8+a5@  
     continue; /Bid:@R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) gT'c`3Gkz  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); f3|ttUX  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 bec n$R  
   } $f*N  
  } }q G{1Er  
 } &'N{v@Oi)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d%81}4f:  
} wZh&w<l'  
@xm O\  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: ['sj'3cW-  
qWHH% L;  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Va\dMv-b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qWGnIPk  
n(/(F `  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: V z8o  
5 1@V""m  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) c#$B;?  
{ 05LVfgJ'q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Cv>|>Ob#  
 { %8>s:YG  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 4gb2$"!  
  SaveBmp(); &kHp}\  
  return FALSE; {^Vkxf]  
 } 2Auhv!xV  
 …… //其它处理及默认处理 gtyo~f  
} MmI4J$F  
+b.<bb6  
(LA%q6  
  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。 JaXT B"e  
75r>~@)*  
  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。 iP~5=  
LpGplD lB  
  二、编程步骤 sk\U[#ohH  
&v Lz{  
  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"; wV+ W(  
sNc(aGvy  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 9AD`,]b  
C~ 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; +J} wYind  
$\Bzp<SN`  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; K19/M1~  
h8Q+fHDYv  
  5、 添加代码,编译运行程序。 A07g@3n  
--d<s  
三、程序代码 ;gY W!rM  
U[*VNJSp  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL F^ 7qLvh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) K~H)XJFF  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ K:Wxx "  
#if _MSC_VER > 1000 (wEaa'XL  
#pragma once L@HPU;<  
#endif // _MSC_VER > 1000 l_hM,]T0  
#ifndef __AFXWIN_H__ Y;8Ys&/t  
#error include 'stdafx.h' before including this file for PCH _7'9omq@  
#endif 8*!<,k="9  
#include "resource.h" // main symbols mTz %;+|L  
class CHookApp : public CWinApp ]|it&4l  
{ btHN  
 public: 1 0lvhzU  
  CHookApp(); &)JQ6J_|\  
  // Overrides 'DO^($N  
  // ClassWizard generated virtual function overrides _ui03veA1  
  //{{AFX_VIRTUAL(CHookApp) 5XySF #  
 public: Q1jU{  
  virtual BOOL InitInstance(); Ig}G"GR  
  virtual int ExitInstance(); lT#&\JQ  
  //}}AFX_VIRTUAL #qrZ(,I@n  
  //{{AFX_MSG(CHookApp) 6!dbJ5x1  
  // NOTE - the ClassWizard will add and remove member functions here. k!3X4;F!_  
  // DO NOT EDIT what you see in these blocks of generated code ! |t+M/C0y/  
  //}}AFX_MSG )Fx"S.Ok  
  DECLARE_MESSAGE_MAP() 9]fhH  
}; M(|Qvh{Q6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); v".q578 0B  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1j0OV9-|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \ZX5dFu0  
BOOL InitHotkey(); T]-yTsto  
BOOL UnInit(); i]J*lM7'  
#endif g}"`@H(9r3  
xI}o8GKQq  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. k"D6Vyy`  
#include "stdafx.h" X TEC0s"F  
#include "hook.h" I=o[\?u*_  
#include <windowsx.h> (|)`~z  
#ifdef _DEBUG c[\ :^w^I6  
#define new DEBUG_NEW lffp\v{w  
#undef THIS_FILE Hy ^E m  
static char THIS_FILE[] = __FILE__; M #'br<]  
#endif x;)bp7  
#define MAX_KEY 100 KY34Sc  
#define CTRLBIT 0x04 W2/FGJD  
#define ALTBIT 0x02 #N^TqOr  
#define SHIFTBIT 0x01 ! Ob  
#pragma data_seg("shareddata") %a=K:" oU[  
HHOOK hHook =NULL; I$/*Pt];  
UINT nHookCount =0; ^]l^q'?>:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey HM57b>6  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 1+6:K._C(m  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey JTK>[|c9oE  
static int KeyCount =0; *p:`F:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift kP~'C'5Ys  
#pragma data_seg()  %Xs3Lz  
HINSTANCE hins; wmKM:`&[5  
void VerifyWindow(); ]x1MB|a6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) W,"|([t4.\  
//{{AFX_MSG_MAP(CHookApp) KiYO,nD;\  
// NOTE - the ClassWizard will add and remove mapping macros here. 1c_gh12  
// DO NOT EDIT what you see in these blocks of generated code! ^ CVhV  
//}}AFX_MSG_MAP cpvN }G  
END_MESSAGE_MAP() 9<u^.w  
nv&uhu/q  
CHookApp::CHookApp() 1{+x >Pv:  
{ g?N~mca$  
 // TODO: add construction code here, gw~ %jD-2  
 // Place all significant initialization in InitInstance i{[=N9U5o  
} DTmv2X  
uw!  
CHookApp theApp; JwCv(1$GM  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) VH[r@Pn  
{ BCsz8U!  
 BOOL bProcessed=FALSE; MJNY#v3  
 if(HC_ACTION==nCode) Ay)q %:qx  
 { :K.%^ag=j  
  if((lParam&0xc0000000)==0xc0000000){// Key up  R}Pw#*B  
   switch(wParam) io :g ]g  
   { QK _1!t3  
    case VK_MENU: 0q'd }DW  
     MaskBits&=~ALTBIT; L[l ?}\  
     break; rMXIw  
    case VK_CONTROL: ,: g.B\'Q  
     MaskBits&=~CTRLBIT; $$ %4,\{l  
     break; )Y%>t  
    case VK_SHIFT: n,sf$9"  
     MaskBits&=~SHIFTBIT; /~3~Xc ~=p  
     break; (Mi]vK.4  
    default: //judge the key and send message 4;"^1 $  
     break; r_C|gfIP  
   } 0\v98g<[+  
   for(int index=0;index<MAX_KEY;index++){ )006\W|t9  
    if(hCallWnd[index]==NULL) W}m-5L  
     continue; ! |SPOk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qu]ch&"?U  
    { b`"E(S/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ci%u =%(  
     bProcessed=TRUE; iEx.BQ+  
    } v{{Cj83S+  
   } L%](C  
  } kwxb~~S}h(  
  else if((lParam&0xc000ffff)==1){ //Key down T}} 0hs;  
   switch(wParam) i9Fg  
   { Q'-V\G)11  
    case VK_MENU: 9~+A<X]Hd  
     MaskBits|=ALTBIT; n]M1'yU  
     break; |GuIp8~  
    case VK_CONTROL: RmS|X"zc  
     MaskBits|=CTRLBIT; Z(Da?6#1  
     break; x._IP,vRx^  
    case VK_SHIFT: sYV7t*l  
     MaskBits|=SHIFTBIT; []HMUL]"  
     break; !iKR~&UpAL  
    default: //judge the key and send message u] C/RDTH  
     break; TymE(,1  
   } ,w~0U  
   for(int index=0;index<MAX_KEY;index++) rM<lPMr1*  
   { Bvzu{B%  
    if(hCallWnd[index]==NULL) >55c{|"@L  
     continue; 2p\CCzw  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~wnTl[:  
    { &gJKJ=7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); #Mo`l/Cwp  
     bProcessed=TRUE; n8(B%KF  
    } J ytY6HF  
   } .qVz rS  
  } OJd!g/V  
  if(!bProcessed){ 6BIP;, M=  
   for(int index=0;index<MAX_KEY;index++){ 9hAS#|vK  
    if(hCallWnd[index]==NULL) mv@cGdxu  
     continue; KTn,}7vZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xe^*\6Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x_9<&Aj6  
   } `@GqD  
  } `|K,E  
 } Z09FW>"u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); jvx9b([<sG  
} J6x\_]1:*  
/64jO?mp  
BOOL InitHotkey() 8r[ZGUV  
{ 4 -)'a} O  
 if(hHook!=NULL){ vQrce&  
  nHookCount++; Ta#vD_QP  
  return TRUE; u#5/s8  
 } EubR] ckB  
 else SNP.n))   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); d_9Fc" C~  
  if(hHook!=NULL) -1Y9-nn[m  
   nHookCount++; gyH'92ck  
  return (hHook!=NULL); /x.TF'Z*  
} Q,Tet&in )  
BOOL UnInit() #!p=P<4M  
{ 6cof Zc$  
 if(nHookCount>1){ >}QRMn|@H  
  nHookCount--; {#q']YDe`  
  return TRUE; y e!Bfz>  
 } EM/NT/  
 BOOL unhooked = UnhookWindowsHookEx(hHook); tf64<j6  
 if(unhooked==TRUE){ D|I(2%aC  
  nHookCount=0; RAR0LKGX  
  hHook=NULL; 7t-j2 n`<  
 } /nXp5g^6(  
 return unhooked; Wz$%o'OnC  
} @k~?h=o\b  
 ToNi<~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8?] :>  
{ `}o4&$  
 BOOL bAdded=FALSE; ~^/zCPy[w  
 for(int index=0;index<MAX_KEY;index++){ J5LP#o(V  
  if(hCallWnd[index]==0){ $mm =$.  
   hCallWnd[index]=hWnd; r`u}n  
   HotKey[index]=cKey; rUfW0  
   HotKeyMask[index]=cMask; 3{_AzL  
   bAdded=TRUE; :1u>T3L.z  
   KeyCount++; ga#,42)H  
   break; tb,.f3;  
  } $w%oLI@kl  
 } /^96|  
 return bAdded; /2^cty.BXw  
} J*6I@_{/ U  
E%ea o$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3ojK2F(1D  
{ 1wUZ0r1'  
 BOOL bRemoved=FALSE; Cw?AP6f%  
 for(int index=0;index<MAX_KEY;index++){ xrx{8pf  
  if(hCallWnd[index]==hWnd){ 1!/+~J[#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ KsYT3  
    hCallWnd[index]=NULL; b3b 4'l   
    HotKey[index]=0; ~\dpD  
    HotKeyMask[index]=0; >V(>2eD'S  
    bRemoved=TRUE; .jMm-vox}  
    KeyCount--; mFayU w  
    break; ]i*q*]x2u  
   } &QE^i%6>\  
  } ';V(sRU@  
 } [i[G" %Q  
 return bRemoved; vZ 4Z+;.  
} b qB[ vPsI  
'R*gSqx~  
void VerifyWindow() /Nq!^=  
{ ~J2-B2S!  
 for(int i=0;i<MAX_KEY;i++){ 322W"qduTZ  
  if(hCallWnd!=NULL){ Qv8#{y@U  
   if(!IsWindow(hCallWnd)){ n ! qm  
    hCallWnd=NULL; cb&y8!ci~  
    HotKey=0; }7hpx!s,  
    HotKeyMask=0; ]SrKe-*:U  
    KeyCount--; [e)81yZG>  
   } :w_F<2d0 0  
  } !boKrSw  
 } 9CJUOB>]  
} hgj#VY$B  
.Q"3 [  
BOOL CHookApp::InitInstance() 9BI5qHEp  
{ XBhWj\`(T  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); QOuy(GY  
 hins=AfxGetInstanceHandle(); bI[!y#_z4  
 InitHotkey(); N-^\X3X  
 return CWinApp::InitInstance(); /iif@5lw{  
} <6/XE@"   
7tAWPSwf  
int CHookApp::ExitInstance() *" <tFQ  
{ {N5g52MN  
 VerifyWindow(); 7~\Dzcfk"P  
 UnInit(); NOyLZa'  
 return CWinApp::ExitInstance(); zq!2);,  
} $Fz/&;KX!  
([|5(Omd\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file +^YV>;  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) _if&a'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ?y<n^`  
#if _MSC_VER > 1000 &Wd,l$P<O  
#pragma once 2?t(%uf]  
#endif // _MSC_VER > 1000 t)XV'J  
O RQGay  
class CCaptureDlg : public CDialog iN<5[ztd  
{ 6?*iIA$b  
 // Construction ]p'Qk  
 public: N["c*=x  
  BOOL bTray; t{~"vD9Am  
  BOOL bRegistered; 5YS`v#+  
  BOOL RegisterHotkey(); "EEE09~l\  
  UCHAR cKey; &8"a7$  
  UCHAR cMask; ^\N2 Iu>6  
  void DeleteIcon(); j,/o0k,  
  void AddIcon(); W\.f:"2qr  
  UINT nCount; /<:9NP'^  
  void SaveBmp(); ;x^&@G8W`  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor EoU}@MjM~  
  // Dialog Data L*FmJ{Yf  
  //{{AFX_DATA(CCaptureDlg) gY0*u+LF  
  enum { IDD = IDD_CAPTURE_DIALOG }; |Q9S$l]  
  CComboBox m_Key; 6FEtq,;0w  
  BOOL m_bControl; /oiAAB27  
  BOOL m_bAlt; JS(KCY9  
  BOOL m_bShift; YD@V2gK  
  CString m_Path; tB(Q-c  
  CString m_Number; !c6 lP'U  
  //}}AFX_DATA 1<\cMY6  
  // ClassWizard generated virtual function overrides p00\C  
  //{{AFX_VIRTUAL(CCaptureDlg) czMLvPXRx  
 public: bSz6O/A/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); LV8,nTYvE  
 protected: d,<ctd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support !LIWoa[ F.  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); asQ" |]m  
  //}}AFX_VIRTUAL w-/bLg[L?$  
  // Implementation s #L1:L  
 protected: [Hd^49<P2  
  HICON m_hIcon; *otJtEI>6  
  // Generated message map functions nWXI*%m5  
  //{{AFX_MSG(CCaptureDlg) wCmwH=O  
  virtual BOOL OnInitDialog(); Q]6nW[@j'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); CKh-+8j  
  afx_msg void OnPaint(); 7%7_i%6wP  
  afx_msg HCURSOR OnQueryDragIcon(); tm]75*?  
  virtual void OnCancel(); fiw~"2U  
  afx_msg void OnAbout(); B|extWwu  
  afx_msg void OnBrowse(); Tr@`ozp8  
  afx_msg void OnChange(); ? 5B}ZMW  
 //}}AFX_MSG AO']Kmm  
 DECLARE_MESSAGE_MAP() 5yA^n6  
}; #{h4lte  
#endif |{ 9"n<JW  
Y!POUMA }A  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 1M 3U)U  
#include "stdafx.h" SF.,sCk  
#include "Capture.h" a S<JsB  
#include "CaptureDlg.h" 6 Dg[ b  
#include <windowsx.h>  h@W}xT  
#pragma comment(lib,"hook.lib") |d%Dw^  
#ifdef _DEBUG ;7m>40W  
#define new DEBUG_NEW =z=Guvcn`  
#undef THIS_FILE =HoiQWQs`  
static char THIS_FILE[] = __FILE__; gVG :z_6  
#endif 4uNcp0  
#define IDM_SHELL WM_USER+1 k ,<L#?,a  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0.@/I}R[  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #h r!7Kc;N  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; -CL7^  
class CAboutDlg : public CDialog i6X/`XW'  
{ MH !CzV&  
 public: .7) A8R7Wt  
  CAboutDlg(); r ,b  
  // Dialog Data ;OdUH   
  //{{AFX_DATA(CAboutDlg) 'kh%^_FH7  
  enum { IDD = IDD_ABOUTBOX }; ahV_4;yF  
  //}}AFX_DATA (b{ {B$O  
  // ClassWizard generated virtual function overrides #e9B|Y?b  
  //{{AFX_VIRTUAL(CAboutDlg)  bM-Y4[  
 protected: }*R" yp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support :m37Fpz&b  
  //}}AFX_VIRTUAL 8tdUnh%/  
  // Implementation "%.#/!RG  
 protected: 3}h&/KN{  
  //{{AFX_MSG(CAboutDlg) *:&fw'vd,  
  //}}AFX_MSG @#T?SNIL5  
  DECLARE_MESSAGE_MAP() p O: EJ  
}; cA/2,i  
dUe"qH29s  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {Ua5bSbh  
{ {X"X.`p  
 //{{AFX_DATA_INIT(CAboutDlg) 8"<!8Img  
 //}}AFX_DATA_INIT W B!$qie\  
} x65e,'  
N`zHe*=[~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ;<MaCtDt  
{ ikxSWO_Y=  
 CDialog::DoDataExchange(pDX); 5:s]z#8)  
 //{{AFX_DATA_MAP(CAboutDlg) T.(SBP  
 //}}AFX_DATA_MAP @ym7hk.  
} +6;OB@  
@C!q S7k)  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) -_314j=`/  
 //{{AFX_MSG_MAP(CAboutDlg) >Y \4 v}-  
 // No message handlers st+Kz uK  
 //}}AFX_MSG_MAP BryMq !  
END_MESSAGE_MAP() ZR#UoYjupb  
PkVXn  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P0z "Eq0S  
: CDialog(CCaptureDlg::IDD, pParent) ~z aV.3#  
{ L9kSeBt  
 //{{AFX_DATA_INIT(CCaptureDlg) b#y}VY)?  
  m_bControl = FALSE; QWxQD'L'  
  m_bAlt = FALSE; N\Hd3Om  
  m_bShift = FALSE; 8bK}& *z<  
  m_Path = _T("c:\\"); []Fy[G.)H  
  m_Number = _T("0 picture captured."); 4o=G) KO{  
  nCount=0; X'u`\<&W  
  bRegistered=FALSE; |BW956fBU  
  bTray=FALSE; }YSH8d  
 //}}AFX_DATA_INIT PAc~p8S  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 MRC5c:(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,>g 6OU2~6  
} .6'T;SoK>  
J`V6zGgW  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1U9iNki  
{ *FAg^G&1  
 CDialog::DoDataExchange(pDX); N&ddO-r[s  
 //{{AFX_DATA_MAP(CCaptureDlg) WI6er;D  
  DDX_Control(pDX, IDC_KEY, m_Key); K{iay g!k  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *1%g=vb  
  DDX_Check(pDX, IDC_ALT, m_bAlt); {Ise (>V  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); g_x<+3a  
  DDX_Text(pDX, IDC_PATH, m_Path); '+eP%Y[W%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); h]=chz  
 //}}AFX_DATA_MAP <B fwR$  
} [cH/Y2[  
{otvJ |'N  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ~Ep&:c4:D  
//{{AFX_MSG_MAP(CCaptureDlg) asJYGqdF  
 ON_WM_SYSCOMMAND() }.hBmhnZmI  
 ON_WM_PAINT() @%TQ/L^|  
 ON_WM_QUERYDRAGICON() ECSC,oJ  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Hv=coS>g:  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) \.{JS>!  
 ON_BN_CLICKED(ID_CHANGE, OnChange) H}$#aXEAn  
//}}AFX_MSG_MAP T8\,2UWsj2  
END_MESSAGE_MAP() _ <~05Eh  
|/s.PNP2  
BOOL CCaptureDlg::OnInitDialog() ]6aM %r=c  
{ Z/I!\  
 CDialog::OnInitDialog(); jsG9{/Ov3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); q"cFw${  
 ASSERT(IDM_ABOUTBOX < 0xF000); "2h#i nS  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 42C:cl} ."  
 if (pSysMenu != NULL) f*I5 m=  
 { 9w(j2i q  
  CString strAboutMenu; _I!Xr!!)a0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); T-@pTJ !K9  
  if (!strAboutMenu.IsEmpty()) :vr,@1c  
  { =#u2Rx%V  
   pSysMenu->AppendMenu(MF_SEPARATOR); lt*k(JD  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [X I5Bu ~  
  } r" D|1  
 } l:ED_env:  
 SetIcon(m_hIcon, TRUE); // Set big icon Q?>#sN,  
 SetIcon(m_hIcon, FALSE); // Set small icon pqs)ueu  
 m_Key.SetCurSel(0); 5[3hw4  
 RegisterHotkey(); JC#@sJ4az)  
 CMenu* pMenu=GetSystemMenu(FALSE); |B n=$T]  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;L[9[uQ[C  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); dbLX}>  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 08f~vw"  
 return TRUE; // return TRUE unless you set the focus to a control RpXQi*c0  
} q5 A+%#  
MJb = +L  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) X+3)DE\2  
{ KZE.}8^%D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 4A&e+kz&:R  
 { <_>6a7ra  
  CAboutDlg dlgAbout; zbR.Lb  
  dlgAbout.DoModal(); EH3G|3^xz  
 } NWg\{a  
 else cjR.9bgn  
 { <8bO1t^*  
  CDialog::OnSysCommand(nID, lParam); t[maUy _A  
 } >R: +ml  
} b[k 1)R"  
GlZ9k-ZRF  
void CCaptureDlg::OnPaint() ? 1{S_  
{ @Otc$hj  
 if (IsIconic()) KC u6:)6'  
 { ^ZlV1G;/W@  
  CPaintDC dc(this); // device context for painting Rf^cw}jU  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ""+*Gn 7^8  
  // Center icon in client rectangle s`J=:>9*  
  int cxIcon = GetSystemMetrics(SM_CXICON); p^:Lj9Qax  
  int cyIcon = GetSystemMetrics(SM_CYICON); B#MW`7c  
  CRect rect; Tc(R-Wi  
  GetClientRect(&rect); a7|&Tbv  
  int x = (rect.Width() - cxIcon + 1) / 2; ) T1 oDk  
  int y = (rect.Height() - cyIcon + 1) / 2; 5jQP"^g  
  // Draw the icon ,OCTm%6e  
  dc.DrawIcon(x, y, m_hIcon); 9/M!S[N9  
 } qtN29[x  
 else \.a .'l  
 { O-5U|wA  
  CDialog::OnPaint(); E?mp6R]}%  
 } `Cf en8  
} \Sby(l  
h /QP=Zd  
HCURSOR CCaptureDlg::OnQueryDragIcon() N^]>R :Stu  
{ \#jDQ  
 return (HCURSOR) m_hIcon; }?J5!X  
} } XU:DE  
E@6r{uZ#  
void CCaptureDlg::OnCancel() <M?#3&5A  
{ $jm<' 4  
 if(bTray) -!>ZATL<B  
  DeleteIcon();  &n.uNe  
  CDialog::OnCancel(); 25n (&NV  
} _0q~s@-  
Q|KD/s??  
void CCaptureDlg::OnAbout() ]C6[`WF  
{ #(+HSZm  
 CAboutDlg dlg; (OcNC/9  
 dlg.DoModal(); 2 `h!:0  
} doO Ap9%  
y6Epi|8  
void CCaptureDlg::OnBrowse() (E}cA&{  
{ j~S!!Z ]  
 CString str; #K1BJ#KUt  
 BROWSEINFO bi; u?3NBc$~A  
 char name[MAX_PATH]; F2`htM@,  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Y+u-J4bj  
 bi.hwndOwner=GetSafeHwnd(); 8C,utjy  
 bi.pszDisplayName=name; 4_762Gu%  
 bi.lpszTitle="Select folder"; Qy^z*s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; px }7If  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); d6@jEa-  
 if(idl==NULL) k\c &2T]W  
  return; )*K<;WI WH  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); NC.P 2^%  
 str.ReleaseBuffer(); '<&EPUO  
 m_Path=str; -)O kG#J@  
 if(str.GetAt(str.GetLength()-1)!='\\') }\939Y  
  m_Path+="\\"; ]]=-AuV.  
 UpdateData(FALSE); U 'CfP9=  
} y+";  
Qyv'nx0=  
void CCaptureDlg::SaveBmp() n;kciTD%wK  
{ ('* *nP  
 CDC dc; !P~ PF:W~|  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); *pTO|x{  
 CBitmap bm; Z&]+A,  
 int Width=GetSystemMetrics(SM_CXSCREEN); s1Tl.p5  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,|. *,  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ~nj bLUB  
 CDC tdc; !0OD(XT  
 tdc.CreateCompatibleDC(&dc); [CDXCV-z  
 CBitmap*pOld=tdc.SelectObject(&bm); hX8gV~E=y  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); g| ._n  
 tdc.SelectObject(pOld); - Y8ks7  
 BITMAP btm; rO(TG  
 bm.GetBitmap(&btm); T018)WrhL  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; c BHL,  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ,%?; \?b%h  
 BITMAPINFOHEADER bih; ].-J.  
 bih.biBitCount=btm.bmBitsPixel; up &NCX  
 bih.biClrImportant=0; d{2 y/  
 bih.biClrUsed=0; Im?= e  
 bih.biCompression=0; tt7PEEf  
 bih.biHeight=btm.bmHeight; Gf H*,1x  
 bih.biPlanes=1; ii_|)udz  
 bih.biSize=sizeof(BITMAPINFOHEADER); :m* !?QGdL  
 bih.biSizeImage=size; G9i&#)nWr  
 bih.biWidth=btm.bmWidth; $m:2&lU3  
 bih.biXPelsPerMeter=0; &Mhv XHI  
 bih.biYPelsPerMeter=0; [+%d3+27  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {1Ju} =69  
 static int filecount=0; 1 ;\]D9i  
 CString name; X;OsH  
 name.Format("pict%04d.bmp",filecount++); KUp   
 name=m_Path+name; <+T\F;   
 BITMAPFILEHEADER bfh; *K+jsVDY  
 bfh.bfReserved1=bfh.bfReserved2=0; ]_ejDN\>{V  
 bfh.bfType=((WORD)('M'<< 8)|'B'); cuQ7kECV  
 bfh.bfSize=54+size; 29a_ZU7e6  
 bfh.bfOffBits=54; hJw |@V  
 CFile bf; FQk_#BkK  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Mhb '^\px  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); mq J0z4I}  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); .'^6QST  
  bf.WriteHuge(lpData,size); YPha9M$AgU  
  bf.Close(); K0 O-WJ  
  nCount++; ]pOYVf *$  
 } C#U< k0R  
 GlobalFreePtr(lpData); G2CZwm{/f  
 if(nCount==1) ka5#<J7<p  
  m_Number.Format("%d picture captured.",nCount); }uF[Ra  
 else dThR)Z'=  
  m_Number.Format("%d pictures captured.",nCount); x|@1 wQ" 6  
  UpdateData(FALSE); V3>f*Z)xn  
} s[G |q5n  
Wl& >6./{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) t7um [  
{ {cR_?Y@  
 if(pMsg -> message == WM_KEYDOWN) ? G$Om  
 { SY%A"bC  
  if(pMsg -> wParam == VK_ESCAPE) cBz!U 8(  
   return TRUE; ZnvEv;P  
  if(pMsg -> wParam == VK_RETURN) V!T^wh;  
   return TRUE; wr$cK'5ZL  
 } k^H0b\hYY  
 return CDialog::PreTranslateMessage(pMsg); ydwK!j0y  
} gYTyH.  
2{A;du%&  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,|T*|2Gm  
{ M82.khm~jM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 8hTR*e! +  
  SaveBmp(); )-bD2YA{  
  return FALSE; 81GQijq  
} >_;kTy,  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ RLdl z  
 CMenu pop; )KSisEL  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); :/o C:z\h  
 CMenu*pMenu=pop.GetSubMenu(0); { 1+Cw?1d  
 pMenu->SetDefaultItem(ID_EXITICON); A",eS6  
 CPoint pt; ]b4pI*:$I  
 GetCursorPos(&pt); Ik`O.Q.}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); F(Lb8\to\M  
 if(id==ID_EXITICON) 5;IT64&]  
  DeleteIcon(); _PK}rr?"7O  
 else if(id==ID_EXIT) +7| [b  
  OnCancel(); ]Nnxnp  
 return FALSE; h&)fu{   
} v6wRME;JA  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =nJ{$%L\x,  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0CPxIF&  
 AddIcon(); _Zh2eXWdjM  
 return res; Y\.-v\uJu  
} "6?lQw e  
QB!jLlg(  
void CCaptureDlg::AddIcon() T>d\%*Q+B  
{ `_|aeoK_  
 NOTIFYICONDATA data; :1:3Svb<Y  
 data.cbSize=sizeof(NOTIFYICONDATA); ?nQ_w0j  
 CString tip; d)N^PJ/  
 tip.LoadString(IDS_ICONTIP); %1Yz'AiW[  
 data.hIcon=GetIcon(0); k/%#>  
 data.hWnd=GetSafeHwnd(); 3pB}2]  
 strcpy(data.szTip,tip); n'T He|:I  
 data.uCallbackMessage=IDM_SHELL; 1o8wy_eSs  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; G3G/ xC"  
 data.uID=98; $0_^=D EW  
 Shell_NotifyIcon(NIM_ADD,&data); q(,cYu  
 ShowWindow(SW_HIDE); y<TOqn  
 bTray=TRUE; VM7 !0  
} " jT#bIm  
2+z1h^)W  
void CCaptureDlg::DeleteIcon() uS~#4;R   
{ UH[<&v  
 NOTIFYICONDATA data; aR _NyA  
 data.cbSize=sizeof(NOTIFYICONDATA); UVrQV$g!  
 data.hWnd=GetSafeHwnd(); ]nQ+nH  
 data.uID=98; Y,C=@t@_  
 Shell_NotifyIcon(NIM_DELETE,&data); Jm4#V~w  
 ShowWindow(SW_SHOW); NetYg]8`  
 SetForegroundWindow(); vYdR ht\(  
 ShowWindow(SW_SHOWNORMAL); yMb|I~k  
 bTray=FALSE; $xT1 1 ^  
} xRlYr# %  
} ~| k  
void CCaptureDlg::OnChange() 8'_ 0g[s  
{ `z9J`r= I  
 RegisterHotkey(); i\)3l%AK]T  
} );Z]SGd  
k^%2_H  
BOOL CCaptureDlg::RegisterHotkey() gyev5txn  
{ :=*}htP4C  
 UpdateData(); JE hm1T  
 UCHAR mask=0; v8m`jxII64  
 UCHAR key=0; XV>@B $hu  
 if(m_bControl) v>H=,.`0\  
  mask|=4; L2fZ{bgy  
 if(m_bAlt) je%ldY]/@  
  mask|=2; [k$efwJ  
 if(m_bShift) .IgRY\?Q  
  mask|=1; 0}]SUe^  
  key=Key_Table[m_Key.GetCurSel()]; uFG<UF  
 if(bRegistered){ gzf-)J  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); e"k/d<  
  bRegistered=FALSE; OX\$nQ\o  
 } W\8Ln>  
 cMask=mask;  @pFj9[N  
 cKey=key; 71"+<C .  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); dz-y}J11  
 return bRegistered; t> xd]ti  
} (RE2I  
Q9c)k{QZ  
  四、小结 #H~_K}Ks  
O,s.D,S  
  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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