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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: N)9pz?*V  
  L`<T'3G  
  一、实现方法 YJ &lB&xH  
2]?w~qjWm  
  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: W?SP .-I  
HVtr,jg  
#pragma data_seg("shareddata") R-=_z 6<  
HHOOK hHook =NULL; //钩子句柄 E1$Hu{  
UINT nHookCount =0; //挂接的程序数目 Ufm(2`FQ  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \[@Q}k[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 KyuA5jQ7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ({D}QEP  
static int KeyCount =0; <K=@-4/Bp  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Eqz4{\   
#pragma data_seg() ?|%\<h@;  
N*_/@qM> a  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 z Y$X|= f  
"3U{h]  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: zz7Y/653  
|V5$'/Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR o(B<!ji~'  
cKey,UCHAR cMask) J=f:\]@Oy  
{ j AJ/  
 BOOL bAdded=FALSE; {bAWc.  
 for(int index=0;index<MAX_KEY;index++){ Qs}/x[I  
  if(hCallWnd[index]==0){ v9j4|w  
   hCallWnd[index]=hWnd; t(Q&H!~e   
   HotKey[index]=cKey; %igFHh?  
   HotKeyMask[index]=cMask; zhVa.r A  
   bAdded=TRUE; lWu9/r 1  
   KeyCount++; 3i@ "D  
   break; 7yq7a[Ra  
  } LUe>)eqw  
 } ~!a~C~_  
 return bAdded; WH pUjyBP  
} hQd@bN8  
//删除热键 }}4 sh5z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3{2^G@j  
{ @%I_&!d  
 BOOL bRemoved=FALSE; h"RP>fZt  
 for(int index=0;index<MAX_KEY;index++){ zIAu3  
  if(hCallWnd[index]==hWnd){ E<X{72fb>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ RTgQ#<W8  
    hCallWnd[index]=NULL; = )JVT$]w  
    HotKey[index]=0; d- Z+fz  
    HotKeyMask[index]=0; Rye ~w6  
    bRemoved=TRUE; O<eWq]  
    KeyCount--; I =tyQ`  
    break; 4 ~MJ4:  
   } [*Aqy76Qa  
  } Yj^avO=;  
 } m>Yo 9/XpZ  
 return bRemoved; 7d M6;`V^  
} &;~2sEo,  
#Lhj0M;a  
LK   
  DLL中的钩子函数如下: ? $)x$nS`  
Tc'{i#%9j  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) T!^?d5uW#  
{ RpmBP[  
 BOOL bProcessed=FALSE; tdw\Di#m  
 if(HC_ACTION==nCode)  Gh)sw72  
 { A}t&-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 .b_0k<M!p  
   switch(wParam) ]<\;d B  
   {  xzMeKC `  
    case VK_MENU: pr[B$X .V  
     MaskBits&=~ALTBIT; i&}zcGC  
     break; !yV,|)y5F  
    case VK_CONTROL: ,E/Y@sajn+  
     MaskBits&=~CTRLBIT; V#-qKV  
     break; _v~D {H&}  
    case VK_SHIFT: OW63^wA`s  
     MaskBits&=~SHIFTBIT; q5'yD;[hE  
     break; </+%R"`  
    default: //judge the key and send message w$(0V$l_  
     break; HP4'8#3o  
   } YP$*;l  
   for(int index=0;index<MAX_KEY;index++){ f'zU^/$rf  
    if(hCallWnd[index]==NULL) n }9Msen  
     continue; *1o+o$hY2  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5E\<r /FeJ  
    { Hl3XqR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?5r2j3mqgv  
     bProcessed=TRUE; k8x&aH  
    } ~J. Fl[  
   } Qa7S'(  
  } Y|0-m#1F#  
  else if((lParam&0xc000ffff)==1){ //有键按下 ;}>g1&q  
   switch(wParam) |0%4G k);  
   { ot>EnHfV  
    case VK_MENU: yf#%)-7(  
     MaskBits|=ALTBIT; QS=$#Gp  
     break; /|u]Y/ *  
    case VK_CONTROL: picP_1L  
     MaskBits|=CTRLBIT; s68_o[[E  
     break; PkCeV]`w  
    case VK_SHIFT: <zDw& s2  
     MaskBits|=SHIFTBIT; Y?vm%t`K  
     break; P8,{k  
    default: //judge the key and send message <v7KE*#  
     break; {DXZ}7w:v  
   } VG'(   
   for(int index=0;index<MAX_KEY;index++){ kX ,FQG>  
    if(hCallWnd[index]==NULL) i[t=@^|  
     continue; ,^+R%7mv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j]?0}Z*  
    { /o1)ZC$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mZ5K hPvf8  
     bProcessed=TRUE; :{xN33@6\X  
    } zIQc#F6\5  
   } \(>$mtS:  
  } [A..<[  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 6P*)rye  
   for(int index=0;index<MAX_KEY;index++){ QV H'06 "{  
    if(hCallWnd[index]==NULL) >KClH'R2  
     continue; V+a%,sI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;~Gpw/]5E  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7SY->-H8  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *ckrn>E{h  
   } ~"r wP=<}  
  } -R$FJb Id  
 } vYt:}$AE  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U)/Ul>dY  
} vS t=Ax3]  
13&>w{S}  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: zl#&Qm4Ot  
9MzkG87J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :XQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); i+x6aQ24  
@[b:([  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: +$= Wms-z  
,WDAcQ8\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a=B0ytNm  
{ pvR& ~g  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) DF[b?  
 { cf!k 9x9Z  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 =]xk-MY"|R  
  SaveBmp(); gcCYXPZp  
  return FALSE; Rw{v"n  
 } \\G6c4 fC  
 …… //其它处理及默认处理 z57papo  
} ?ZV0   
[<fLPa  
|M/ \'pOe  
  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。 +\Mm (Nd  
XXwhs-:o  
  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。 rLVc<595  
;,})VoC\!  
  二、编程步骤 I64:-P[\  
)Q j9kJq  
  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"; c_qy)N  
}Z? [Ut  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <({eOh5 N  
*Z2Q]?:{ i  
  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; +\oHQ=s>}\  
x,c68Q)g  
  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; RF2XJJ  
yaYt/?|  
  5、 添加代码,编译运行程序。 zwrZ ^  
S^VV^O5 ^  
三、程序代码 KdpJ[[Ug/  
9qy 9  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL eRy'N|'  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) y]Tn#4 ,/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1p<?S}zg@  
#if _MSC_VER > 1000 (a!,)  
#pragma once 64>[pZF8  
#endif // _MSC_VER > 1000 P1>X5:  
#ifndef __AFXWIN_H__ )-"L4TC)  
#error include 'stdafx.h' before including this file for PCH 7[1 R}G V  
#endif uPv?Hq  
#include "resource.h" // main symbols  +5mkMZ  
class CHookApp : public CWinApp DmPsltpzQ  
{ F_ Cz  
 public: FOG+[v  
  CHookApp(); >t }D5ah  
  // Overrides h#ot)m|I  
  // ClassWizard generated virtual function overrides =F[,-B~  
  //{{AFX_VIRTUAL(CHookApp) {o<p{q  
 public: w|o@r%Q#l  
  virtual BOOL InitInstance(); L^s;kkB  
  virtual int ExitInstance(); GZX!iT  
  //}}AFX_VIRTUAL 1H 6Wrik  
  //{{AFX_MSG(CHookApp) {*$J&{6V  
  // NOTE - the ClassWizard will add and remove member functions here. 8N_rJ)f  
  // DO NOT EDIT what you see in these blocks of generated code ! vkgL"([_  
  //}}AFX_MSG W3rvKqdw5  
  DECLARE_MESSAGE_MAP() "Oko|3  
}; O;?~#E<6w  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); oA@^N4PD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); O^% ace1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]m>MB )9  
BOOL InitHotkey(); s7} )4.vO  
BOOL UnInit(); BniVZCct  
#endif 1&"1pH  
bC-x`a@  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. :C6r N}_k  
#include "stdafx.h" dS=,. }  
#include "hook.h" |c/rHEZ  
#include <windowsx.h>  m:Abq`C  
#ifdef _DEBUG O_Q,!&*6  
#define new DEBUG_NEW *60)Vo.=  
#undef THIS_FILE  y-#tU>P  
static char THIS_FILE[] = __FILE__; e'&{KD,-T  
#endif rP4@K%F9jB  
#define MAX_KEY 100 9ksrr{tW  
#define CTRLBIT 0x04 BZshTP[`  
#define ALTBIT 0x02 5xUPqW%3  
#define SHIFTBIT 0x01 `VN<6o(  
#pragma data_seg("shareddata") b;l%1x9r  
HHOOK hHook =NULL; x=N;>  
UINT nHookCount =0; @R{&>Q:.  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey P[i/o#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ix`xdVj`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^dD?riFAk  
static int KeyCount =0; X5[sw;rk  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift T9?_ `h  
#pragma data_seg() }2oJ  
HINSTANCE hins; O 9)8a]  
void VerifyWindow(); N *>; '  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Z Uv_u6aD  
//{{AFX_MSG_MAP(CHookApp) {rLOAewr  
// NOTE - the ClassWizard will add and remove mapping macros here. yQ50f~9  
// DO NOT EDIT what you see in these blocks of generated code! B=`!  
//}}AFX_MSG_MAP Z4' v  
END_MESSAGE_MAP() C\D4C]/8  
0fU>L^P_?  
CHookApp::CHookApp() =x>k:l~s  
{ a@J :*W  
 // TODO: add construction code here, B.#0kjA}  
 // Place all significant initialization in InitInstance u*`GIRfWT  
} 9t1_"{'N1  
-<=< T@,  
CHookApp theApp; wf1DvsJQl  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) DYK|"@  
{ Y;>'~V#R  
 BOOL bProcessed=FALSE; (tN$G:+")F  
 if(HC_ACTION==nCode) E!M+37/  
 { m=V2xoMw6  
  if((lParam&0xc0000000)==0xc0000000){// Key up [y>.)BU  
   switch(wParam) K%Bi8d  
   { XZGyhX7  
    case VK_MENU: BW 7[JD  
     MaskBits&=~ALTBIT; 'QU ?O[CH  
     break; W9~datIh>  
    case VK_CONTROL: _A r ,]v  
     MaskBits&=~CTRLBIT; ;@hP*7Lm  
     break; Nl _Jp:8s  
    case VK_SHIFT: lc7]=,qyF  
     MaskBits&=~SHIFTBIT; |0-L08DW  
     break; $49tV?q5  
    default: //judge the key and send message + aF jtb  
     break; !ZW0yCwLQ  
   } nv]64mL3  
   for(int index=0;index<MAX_KEY;index++){ [bXZPIz;j  
    if(hCallWnd[index]==NULL) :9Pqy pd+  
     continue; Fu$sfq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 'P#I<?vB  
    { jtwO\6 t&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ',pPs=  
     bProcessed=TRUE; Q23y.^W%c  
    } Nfh(2g K+  
   } Op{Mc$5a  
  } $@Fj_ N  
  else if((lParam&0xc000ffff)==1){ //Key down ."O(Ig[  
   switch(wParam) ,e,{6Sg6gl  
   { <0m;|Ai'W  
    case VK_MENU: R?Qou!*]  
     MaskBits|=ALTBIT; J:a^''  
     break; ZlzFmNe60  
    case VK_CONTROL: d mO|PswW  
     MaskBits|=CTRLBIT; }f}&|Vap  
     break; FCPbp!q6  
    case VK_SHIFT: Jo0x/+?,+  
     MaskBits|=SHIFTBIT; @ 2_&ti  
     break; w[&BY  
    default: //judge the key and send message -=w.tJD  
     break; x&d<IU)5  
   } Jo@9f(hq  
   for(int index=0;index<MAX_KEY;index++) X(\RA.64  
   { 5Fl|=G+3@g  
    if(hCallWnd[index]==NULL) '4rgIs3=x"  
     continue; +#no$m.bH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 5`Bb0=j  
    { ;D:v@I$I  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); nj  
     bProcessed=TRUE; "oQ@.]-#  
    } ZSNg^)cN  
   } P}jr 8Z  
  } eu =2a>  
  if(!bProcessed){ K2QD&!4/T2  
   for(int index=0;index<MAX_KEY;index++){ By9/tB  
    if(hCallWnd[index]==NULL) NO1PGen  
     continue; 8 _J:Yg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4/4IZfznX  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); I}X8-WFB  
   } u(R`}C?P'  
  } =3'wHl  
 } G r)+O  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); vuf|2!kh/  
} D<`X B*  
yT4|eHl  
BOOL InitHotkey() VWi-)  
{ :vjbuqN]  
 if(hHook!=NULL){ {~SR>I3sv  
  nHookCount++; oaHBz_pg  
  return TRUE; ~EBZlTN  
 } 0U<9=[~q7@  
 else uD"Voh|]=  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); =ZQIpc  
  if(hHook!=NULL) !v-(O"a  
   nHookCount++; #?9o A4Q  
  return (hHook!=NULL); iq#Z\Y(  
} T1E=<q4  
BOOL UnInit() - M]C-$  
{ ,<BTv;4p  
 if(nHookCount>1){ ?6Gq &  
  nHookCount--; 8c9_=8vw  
  return TRUE; &Ru6Yt0W  
 } ~BC5no  
 BOOL unhooked = UnhookWindowsHookEx(hHook); c1`o3gb  
 if(unhooked==TRUE){ 8HzEH-J   
  nHookCount=0; ^6`U0|5mRX  
  hHook=NULL; l},%g%}iMU  
 } ,RZktWW_  
 return unhooked; R?W8l5CIk  
} 6=   
Q|>y2g!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) {9)f~EbM!  
{ =k'dbcfO$9  
 BOOL bAdded=FALSE; D|xSO~M5  
 for(int index=0;index<MAX_KEY;index++){ pnD#RvmW2e  
  if(hCallWnd[index]==0){ G`pI{_-e  
   hCallWnd[index]=hWnd; EQ28pAZ  
   HotKey[index]=cKey; bke 1 F '  
   HotKeyMask[index]=cMask; iG ;6e~p  
   bAdded=TRUE; x~W&a*WNT  
   KeyCount++; 2eNm2;  
   break; 7G/"!ePW6`  
  } Pw")|85  
 } l6&R g-  
 return bAdded; U5klVl  
} #&2mu  
DeUDZL%/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ((y+FJH  
{ A1|:$tED+2  
 BOOL bRemoved=FALSE; 6jn<YR E-  
 for(int index=0;index<MAX_KEY;index++){ dG| iA]  
  if(hCallWnd[index]==hWnd){ aU3&=aN+  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ M1^pW 63  
    hCallWnd[index]=NULL; qAm%h\  
    HotKey[index]=0; 0zd1:*KR,  
    HotKeyMask[index]=0; i@2?5U>h  
    bRemoved=TRUE; vF_?1|*|  
    KeyCount--; 0iYe>u  
    break; xZkLN5I{  
   } b;yhgdFx  
  } |peZ`O^ ~  
 } 3Ry?{m^  
 return bRemoved; lY~xoHT;[  
} ,Zdc  
t~Uqsa>n@'  
void VerifyWindow() Ei#"r\q j_  
{ 8Hhe&B  
 for(int i=0;i<MAX_KEY;i++){ e0D;]  
  if(hCallWnd!=NULL){ NmeTp?)m  
   if(!IsWindow(hCallWnd)){ K1Tzy=Z9j  
    hCallWnd=NULL; os>|LPv4  
    HotKey=0; 9TF[uC)-2  
    HotKeyMask=0; DI*xf Kt  
    KeyCount--; 8]0^OSS  
   } rO-Tr  
  } }p#S;JZRu+  
 } Hi ?],5,/  
} E_h9y  
$, =n  
BOOL CHookApp::InitInstance() r6^DD$X  
{ 0c]Lm?&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 6gp3n;D  
 hins=AfxGetInstanceHandle(); !_]WUQvV?  
 InitHotkey(); E_xpq  
 return CWinApp::InitInstance(); mFvw s  
} H}:apRb  
@A)gsDt9A  
int CHookApp::ExitInstance() kJ~^  }o  
{ 0n1y$*I4  
 VerifyWindow(); uy B ?-Y+  
 UnInit(); sI~{it#  
 return CWinApp::ExitInstance(); HMBxj($eR  
} r+) A)a,  
13B[m p4  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  iKDGYM  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q i?   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 7Npz {C{I  
#if _MSC_VER > 1000 39u!j|VH  
#pragma once #fa~^]EM]  
#endif // _MSC_VER > 1000 gP<l  
N^)L@6  
class CCaptureDlg : public CDialog r|&qXb x  
{ fx9c1h9s  
 // Construction {dA#r>z\1  
 public: 5:O"T  
  BOOL bTray; gllXJM^ -  
  BOOL bRegistered; }lWEbQ)(!  
  BOOL RegisterHotkey(); -PxA~((g5  
  UCHAR cKey; 4).q+{#k  
  UCHAR cMask; #MI}KmH  
  void DeleteIcon(); o\2#o5#  
  void AddIcon(); ];IUiS1  
  UINT nCount; KSLyU1W  
  void SaveBmp(); p#3P`I>ZrT  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor lGs fs(  
  // Dialog Data {+Eq{8m`  
  //{{AFX_DATA(CCaptureDlg) NC0x!tJ#7  
  enum { IDD = IDD_CAPTURE_DIALOG }; bGDV9su  
  CComboBox m_Key; 7XdLZ4ub  
  BOOL m_bControl; @ij}|k%*  
  BOOL m_bAlt; nE,"3X"   
  BOOL m_bShift; 5?QR  
  CString m_Path; ]` 3;8,  
  CString m_Number; c,e 0+  
  //}}AFX_DATA _pW\F(+8  
  // ClassWizard generated virtual function overrides '*W/Bett  
  //{{AFX_VIRTUAL(CCaptureDlg) 514;!Q4K  
 public: aN.Phn:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); c>I^SY(r%  
 protected: mw.9cDf  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JgEpqA12  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); aWW|.#L  
  //}}AFX_VIRTUAL rlW  
  // Implementation )V+ ;7j<"D  
 protected: >?I[dYzut  
  HICON m_hIcon; C7,Ol0`v  
  // Generated message map functions J8(v65  
  //{{AFX_MSG(CCaptureDlg) U2!9Tl9".  
  virtual BOOL OnInitDialog(); {ImZ><xe/  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wz;IKdk[  
  afx_msg void OnPaint(); Dk8" H >*  
  afx_msg HCURSOR OnQueryDragIcon(); q S2#=  
  virtual void OnCancel(); N-;e" g  
  afx_msg void OnAbout(); l9#vr  
  afx_msg void OnBrowse(); M" %w9)@  
  afx_msg void OnChange(); '@rGX+"  
 //}}AFX_MSG v dyu=*Y  
 DECLARE_MESSAGE_MAP() iYBs )  
}; |odl~juU  
#endif +K]kGF  
{R]4N]l>  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file f5^[`b3H  
#include "stdafx.h" H$WuT;cTE  
#include "Capture.h" YG<?|AS/  
#include "CaptureDlg.h" l[.RnM[v  
#include <windowsx.h> 6wfCC,2  
#pragma comment(lib,"hook.lib") i9uJ%nd:  
#ifdef _DEBUG T[L  
#define new DEBUG_NEW HBeOK  
#undef THIS_FILE 9aYCU/3  
static char THIS_FILE[] = __FILE__;  H 2\KI(  
#endif d+Pfi)+(I  
#define IDM_SHELL WM_USER+1 BY6QJkI9x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PWx2<t<;9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); &`GQS|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _=8x?fC:rl  
class CAboutDlg : public CDialog sZ7{_}B  
{ EnZrnoGM  
 public: %YA=W=Yd  
  CAboutDlg(); 4w\cS&X~C  
  // Dialog Data 4)i/B99k  
  //{{AFX_DATA(CAboutDlg) /N]?>[<NW  
  enum { IDD = IDD_ABOUTBOX }; Tw);`&Ulo  
  //}}AFX_DATA PO ]z'LD  
  // ClassWizard generated virtual function overrides M+9G^o)u  
  //{{AFX_VIRTUAL(CAboutDlg) Whod_Uk  
 protected: g#T8WX{(V  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "\U$aaF  
  //}}AFX_VIRTUAL o"J}@nF  
  // Implementation w SBDJvI  
 protected: O\=3{  
  //{{AFX_MSG(CAboutDlg) 5L%A5C&|  
  //}}AFX_MSG }LN +V~  
  DECLARE_MESSAGE_MAP() bwS1YGb  
}; :dLfM)8}  
*dL!)+:d  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) E_MGejm@  
{ G(EiDo&  
 //{{AFX_DATA_INIT(CAboutDlg) xm6cn\e  
 //}}AFX_DATA_INIT 8$BZbj%?hx  
} ZV$qv=X  
/9QI^6& SX  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) O-@*xwD  
{ e>=P'  
 CDialog::DoDataExchange(pDX); M9[Fx= qY  
 //{{AFX_DATA_MAP(CAboutDlg) |ffM6W1:  
 //}}AFX_DATA_MAP -tlRe12  
} ZC@sUj"  
$RfM}!7?  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) XL1v&'HLV  
 //{{AFX_MSG_MAP(CAboutDlg) E?m(&O j  
 // No message handlers ~8o's`  
 //}}AFX_MSG_MAP {Ug?k<h7|  
END_MESSAGE_MAP() ^ duNEu0*  
,nD:W  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @YHB>rNf(7  
: CDialog(CCaptureDlg::IDD, pParent) 6V KsX+sd  
{ Uo#% f+t  
 //{{AFX_DATA_INIT(CCaptureDlg) MD%_Z/NL  
  m_bControl = FALSE; t-)C0<  
  m_bAlt = FALSE; }E+#*R3auB  
  m_bShift = FALSE; K1AI:$H  
  m_Path = _T("c:\\"); G>qzAgA  
  m_Number = _T("0 picture captured."); GNlP]9wX  
  nCount=0; w(zlHj  
  bRegistered=FALSE; 2j+v\pjYC  
  bTray=FALSE; }Zu>?U  
 //}}AFX_DATA_INIT xv4_q-r[  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 lU`]yL  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <O>1Y09C/  
} Po#;SG#Ee  
yZE"t[q#O  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) w O;\,zU  
{ :,X,!0pWRp  
 CDialog::DoDataExchange(pDX); &9g4/c-?$  
 //{{AFX_DATA_MAP(CCaptureDlg) }SR}ET&z  
  DDX_Control(pDX, IDC_KEY, m_Key); `L/kwVl  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); o}C|N)'  
  DDX_Check(pDX, IDC_ALT, m_bAlt); DG}} S 5  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Xt %;]1n  
  DDX_Text(pDX, IDC_PATH, m_Path); e "5S ;  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wu "6Kyu  
 //}}AFX_DATA_MAP '8R5?9"  
} wuSp+?{5k  
u=JI 1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) .H {  
//{{AFX_MSG_MAP(CCaptureDlg) FIG3P))  
 ON_WM_SYSCOMMAND() s-!Bpr16o0  
 ON_WM_PAINT() Av:5v3%  
 ON_WM_QUERYDRAGICON() {{7%z4l  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) %]S~PKx  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 2It$ bz  
 ON_BN_CLICKED(ID_CHANGE, OnChange) (vMC.y5  
//}}AFX_MSG_MAP wg\*FfQn  
END_MESSAGE_MAP() yJkERiJV  
RsIR}.*  
BOOL CCaptureDlg::OnInitDialog() <2Lcy&w_M  
{ :biM}L  
 CDialog::OnInitDialog(); }u8o*P|,  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ^tc2?T  
 ASSERT(IDM_ABOUTBOX < 0xF000); 5}@6euT5$  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ;+t~$5  
 if (pSysMenu != NULL) JY8wo5H  
 { Fsv:SL+5  
  CString strAboutMenu; c+|,q m  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Hg\+:}k&9  
  if (!strAboutMenu.IsEmpty()) ]V \qX+K  
  { $R4[TQY).!  
   pSysMenu->AppendMenu(MF_SEPARATOR); He^u+N@B  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =X6WK7^0  
  } ?9 hw]Q6r}  
 } 1:%HE*r  
 SetIcon(m_hIcon, TRUE); // Set big icon uKHkC.g  
 SetIcon(m_hIcon, FALSE); // Set small icon GP6-5Y"8  
 m_Key.SetCurSel(0); }JyWy_Y  
 RegisterHotkey(); +Bk" khH  
 CMenu* pMenu=GetSystemMenu(FALSE); |d\ rCq >  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); l ps 6lnh  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); VDq4n;p1  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); *$mDu,'8  
 return TRUE; // return TRUE unless you set the focus to a control H)tnxD0)  
} ICwhqH&  
1sKKmtgH  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) b<o Uy  
{ ,&[2z!  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) d:jD  
 { ihivJ Z  
  CAboutDlg dlgAbout; *<?or"P  
  dlgAbout.DoModal(); $ K1 /^  
 } R?@F%J;tx  
 else *IL x-D5qr  
 { h$7rEs  
  CDialog::OnSysCommand(nID, lParam); ZS[(r-)$F  
 } k9H7(nS{  
} O]rAo  
#n&/yYl9(l  
void CCaptureDlg::OnPaint() CMn&1  
{ | d}f\a`  
 if (IsIconic()) dXR 70/  
 { GjlA\R^e  
  CPaintDC dc(this); // device context for painting P[{qp8(g  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ns`|G;1vv  
  // Center icon in client rectangle oo sbf#V  
  int cxIcon = GetSystemMetrics(SM_CXICON); _): V7Zv  
  int cyIcon = GetSystemMetrics(SM_CYICON); Pl(+&k`}  
  CRect rect; E=!=4"rZF  
  GetClientRect(&rect); @*Sge LeL  
  int x = (rect.Width() - cxIcon + 1) / 2; +mP&B<=H)  
  int y = (rect.Height() - cyIcon + 1) / 2; mv9k_7<  
  // Draw the icon YYfX@`\  
  dc.DrawIcon(x, y, m_hIcon); S0?4}7`A  
 } pGEYke NU  
 else ,Y 1&[  
 { ` QC  
  CDialog::OnPaint(); Qx{k_ye`  
 } *PQu9>1w  
} v,z s dr"d  
%Ci`O hT  
HCURSOR CCaptureDlg::OnQueryDragIcon() Z^?1MJ:`  
{ 0 ?kaXD  
 return (HCURSOR) m_hIcon; wc z|Zy  
} pm$ZKM  
pE.f}  
void CCaptureDlg::OnCancel() tj:3R$a  
{ ANB@cK_  
 if(bTray) \\;i  
  DeleteIcon(); <s/n8#i=H  
  CDialog::OnCancel(); 7d&_5Tj:  
} g3[Zh=+]E  
P2J{ Ml#  
void CCaptureDlg::OnAbout() U^jxKBq^  
{ Cw`8[)=}o  
 CAboutDlg dlg; Fe8JsB-  
 dlg.DoModal(); q;co53.+P)  
} a(}dF?M=  
01v7_*'R  
void CCaptureDlg::OnBrowse() >s#[dr\ww  
{ eeI aH >  
 CString str; @j +8M  
 BROWSEINFO bi; 7w}D2|+  
 char name[MAX_PATH]; x:'M\c7  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ~3k& =3d]  
 bi.hwndOwner=GetSafeHwnd(); ke.{wh\0  
 bi.pszDisplayName=name; VrL==aTYXs  
 bi.lpszTitle="Select folder"; .XPcH(q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; e.pm`%5bO  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); v @zpF)|  
 if(idl==NULL) "E`;8SZa  
  return; RiHOX&-7  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); !e~Yp0gX#  
 str.ReleaseBuffer(); K:PzR,nn  
 m_Path=str; scmn-4j'{  
 if(str.GetAt(str.GetLength()-1)!='\\') [e1kfw  
  m_Path+="\\"; Hg)5c!F7  
 UpdateData(FALSE); l#7].-/  
} G dZ_  
z@!zQ Vp  
void CCaptureDlg::SaveBmp() }1]E=!?)&  
{ :eaqUW!Y  
 CDC dc; 3w&fN3 1  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =+um:*a.  
 CBitmap bm; a*4"j2j v  
 int Width=GetSystemMetrics(SM_CXSCREEN); w)x`zVwO  
 int Height=GetSystemMetrics(SM_CYSCREEN); 3L2@C%  
 bm.CreateCompatibleBitmap(&dc,Width,Height); .Q'/e>0  
 CDC tdc; Wxjv=#3  
 tdc.CreateCompatibleDC(&dc); en\shc{R]`  
 CBitmap*pOld=tdc.SelectObject(&bm); :00 #l]g0q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); rBBA`Ut@F  
 tdc.SelectObject(pOld); cSdkhRAn  
 BITMAP btm; mHTZ:84  
 bm.GetBitmap(&btm); +uR|0Jo8X  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; p^^Ai  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); eIVCg-l}  
 BITMAPINFOHEADER bih; X8!=Xjl)  
 bih.biBitCount=btm.bmBitsPixel; @NBWNgBv  
 bih.biClrImportant=0; 7%rSo^t,L  
 bih.biClrUsed=0; a'R)3:S  
 bih.biCompression=0; Q _}i8p '  
 bih.biHeight=btm.bmHeight; Vp3 9`m-W  
 bih.biPlanes=1; eF8!}|*N  
 bih.biSize=sizeof(BITMAPINFOHEADER); npcB+6  
 bih.biSizeImage=size; u Qy5t:!  
 bih.biWidth=btm.bmWidth; -ya0!D  
 bih.biXPelsPerMeter=0; m5K B#\  
 bih.biYPelsPerMeter=0; S<n3wR"^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); iG<rB-"  
 static int filecount=0; z-(#Mlq:!  
 CString name; .H1 kl)~V  
 name.Format("pict%04d.bmp",filecount++); wg6![Uh  
 name=m_Path+name; Lo, z7"8  
 BITMAPFILEHEADER bfh; u rGk_.f  
 bfh.bfReserved1=bfh.bfReserved2=0; z`gdE0@;d3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); QusEWq)}<  
 bfh.bfSize=54+size; 4Q0@\dR9  
 bfh.bfOffBits=54; $YDZtS&h  
 CFile bf; Q;O\tl  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f'/@h Na3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); s>sIji  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2N]u!S;d  
  bf.WriteHuge(lpData,size); W":is"  
  bf.Close(); muLt/.EZ  
  nCount++; mT N6-V  
 } g*UI~rp  
 GlobalFreePtr(lpData); oo\0X  
 if(nCount==1) YJgw%UVJ5m  
  m_Number.Format("%d picture captured.",nCount); Ks&~VU  
 else f.Y9gkt3d  
  m_Number.Format("%d pictures captured.",nCount); T-7'#uB.m  
  UpdateData(FALSE); 3Rid 1;L0U  
} y<YVb@O.  
AYHfe#!  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) s PNX)  
{ #plwK-tPR  
 if(pMsg -> message == WM_KEYDOWN) 4-q7o]%5<  
 { O[RmQ8ll  
  if(pMsg -> wParam == VK_ESCAPE) _]E ~ci}  
   return TRUE; Zl]Zy}p*+  
  if(pMsg -> wParam == VK_RETURN) w>I>9O}(`  
   return TRUE; 7^k`:Z  
 } cmDskQ:  
 return CDialog::PreTranslateMessage(pMsg); E-,74B&H  
} A.9,p  
H[o'j@0  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) &]~z-0`$!  
{ @+",f]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ G'XlsyaWrb  
  SaveBmp(); sr\lz}JW  
  return FALSE; STgl{#  
} Kb0OauW  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~CRr)(M  
 CMenu pop; s~$kzEtjjU  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); _>HX Q6Hw  
 CMenu*pMenu=pop.GetSubMenu(0); /'1UfjW>  
 pMenu->SetDefaultItem(ID_EXITICON); TX{DZ#  
 CPoint pt; }~lF Rf  
 GetCursorPos(&pt); OVO0Emv  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); [KkLpZG  
 if(id==ID_EXITICON) k/nOz*  
  DeleteIcon(); {! RW*B  
 else if(id==ID_EXIT) s-r$%9o5  
  OnCancel(); Ah)OyO6  
 return FALSE; *iF>}yhe  
} 6w K=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -tT{h 4  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p#.B Fy  
 AddIcon(); /_rAy  
 return res; 9bjjo;A  
} @f0~a  
CAY^ `K!  
void CCaptureDlg::AddIcon() c1wM"  
{ Kzxzz6R?  
 NOTIFYICONDATA data; / /qTMxn  
 data.cbSize=sizeof(NOTIFYICONDATA); Vn1kC  
 CString tip; _1*EMq6  
 tip.LoadString(IDS_ICONTIP); %" $.2O@  
 data.hIcon=GetIcon(0); #{(?a.:  
 data.hWnd=GetSafeHwnd(); P,!W\N%3  
 strcpy(data.szTip,tip); D8_m_M| P  
 data.uCallbackMessage=IDM_SHELL; 'j$iSW&  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; io cr  
 data.uID=98; ro37H2^Ty  
 Shell_NotifyIcon(NIM_ADD,&data); xkl'Y*  
 ShowWindow(SW_HIDE); \Ja%u"D A  
 bTray=TRUE;  ;9c3IK@  
} ld94ek  
7"=  
void CCaptureDlg::DeleteIcon() ,oDZ:";  
{ g'Ft5fQ"o/  
 NOTIFYICONDATA data; j._9;HifZ  
 data.cbSize=sizeof(NOTIFYICONDATA); ltt%X].[  
 data.hWnd=GetSafeHwnd(); >82Q!HaH  
 data.uID=98; ))!Z2PfD  
 Shell_NotifyIcon(NIM_DELETE,&data); %Ua*}C   
 ShowWindow(SW_SHOW); D`e!CprF  
 SetForegroundWindow(); >8SX,  
 ShowWindow(SW_SHOWNORMAL); N##T1 Qm)  
 bTray=FALSE; =KNg "|  
}  <_MQC  
%-]j;'6}cX  
void CCaptureDlg::OnChange() k(\HAIW  
{ IGql^,b  
 RegisterHotkey(); U*/  
} a#!Vi93  
'O]_A57  
BOOL CCaptureDlg::RegisterHotkey() /{7x|ay]  
{ ? $pGG  
 UpdateData(); %xLziF  
 UCHAR mask=0; F$ Us! NN  
 UCHAR key=0; c R$2`:e  
 if(m_bControl) BmUEo$w  
  mask|=4; 4cJ^L <  
 if(m_bAlt) 9`.b   
  mask|=2; KBzEEvx/$  
 if(m_bShift) 6luCi$bL  
  mask|=1; )QaJYC^+  
  key=Key_Table[m_Key.GetCurSel()]; m*P~X*St  
 if(bRegistered){ 9R>A,x(  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); +Qu~UK\   
  bRegistered=FALSE; -N5r[*>  
 } S=[K/Kf-  
 cMask=mask;  A`#v-  
 cKey=key; /lttJJDU  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 5#d"]7  
 return bRegistered; ~n]:f7?I  
} t>&$_CSWK  
 ceVej'  
  四、小结 ;^}cZ  
lZ^XZjwoM  
  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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