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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: 0,m]W)  
  J]Z~.f="  
  一、实现方法 Y-y yg4JH  
6| B9kh}  
  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: R3a}YwJFXF  
ZQfPDH=  
#pragma data_seg("shareddata") N8Zz6{rp  
HHOOK hHook =NULL; //钩子句柄 (57!{[J  
UINT nHookCount =0; //挂接的程序数目 ?$)5NQB%  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 y2jw3R  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :8oJG8WH  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey *IWW,@0  
static int KeyCount =0; +e2:?d@  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3Ji$igL  
#pragma data_seg() N2'aC} I  
g;p} -=  
  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。 #>bj6<  
m#8[")a$"  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: p)iEwl}!j  
/; Bmh=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR hPNMp@Nm6  
cKey,UCHAR cMask) m Rw0R{  
{ =HsE:@  
 BOOL bAdded=FALSE; YcDKRyrt  
 for(int index=0;index<MAX_KEY;index++){ `q<W %'Tb$  
  if(hCallWnd[index]==0){ HW~-GcU-o  
   hCallWnd[index]=hWnd; jci,]*X4  
   HotKey[index]=cKey; C[ mTVxd  
   HotKeyMask[index]=cMask; >god++,o  
   bAdded=TRUE; JJtx `@Bc  
   KeyCount++; v '+]T=  
   break; }}tbOD)t  
  } 7LVG0A2>7  
 } @lE'D":?  
 return bAdded; 0Z6geBMc  
} +K'Hr: (  
//删除热键 w90YlWS#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .nrllVG%`  
{ eyyME c!  
 BOOL bRemoved=FALSE; u7[}pf$}  
 for(int index=0;index<MAX_KEY;index++){ _i+@HXR &  
  if(hCallWnd[index]==hWnd){ h.PBe  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ y')OmR2h  
    hCallWnd[index]=NULL; TMj;NSc3  
    HotKey[index]=0; ^HJ?k:u  
    HotKeyMask[index]=0; JaRsm'SIk~  
    bRemoved=TRUE; \\FT.e6  
    KeyCount--; ~.%HZzR6&  
    break; !&rd#ZBn  
   } *$<W"@%^J  
  } G*@!M%/  
 } \CMZ_%~wU  
 return bRemoved; ;[Mvk6^'R  
} aE`d[d SG  
z~ C8JY:  
v .jxG {~.  
  DLL中的钩子函数如下: T^1 Z_|A  
D=#RQ-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Tf86CH=)5  
{ BHUI1y5t  
 BOOL bProcessed=FALSE; HYfGu1j?X  
 if(HC_ACTION==nCode) q#W|fkfx+  
 { 9RJF  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 wfmM`4Y   
   switch(wParam) I x%>aee  
   {  C 1k< P  
    case VK_MENU: 3T2]V?   
     MaskBits&=~ALTBIT; QJVbt  
     break; "=djo+y  
    case VK_CONTROL: 4#B'pJMw9  
     MaskBits&=~CTRLBIT;  yfZNL?2x  
     break; ef7{D P  
    case VK_SHIFT: eThaH0  
     MaskBits&=~SHIFTBIT; SMX]JZmH  
     break; lvO6&sF1  
    default: //judge the key and send message +i&<`ov  
     break; VVas>/0qr  
   } XM rk2]_  
   for(int index=0;index<MAX_KEY;index++){ !ZYPz}&N_  
    if(hCallWnd[index]==NULL) 7FG;fJ;&NZ  
     continue; Wo 1x ZZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h1w({<q*ov  
    { mM,HMrgLqK  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); V*giF`gq  
     bProcessed=TRUE; KewW8H~tb  
    } K~TwyB-h  
   } hmu>s'  
  } X-c|jn7  
  else if((lParam&0xc000ffff)==1){ //有键按下 vd%g'fTy9  
   switch(wParam) s#9q3JV0  
   { :ky`)F`  
    case VK_MENU: ?QOU9"@+B  
     MaskBits|=ALTBIT; H7zN|NdNw  
     break; K^u,B3  
    case VK_CONTROL: s1:Wrz?4  
     MaskBits|=CTRLBIT; eZ$7VWG#  
     break; hNN>Pd~;  
    case VK_SHIFT: 0k]ApW  
     MaskBits|=SHIFTBIT; !5`MiH  
     break; 1q6)R/P  
    default: //judge the key and send message mZ+!8$1X  
     break; Mog >W&U  
   } mUBy*.  
   for(int index=0;index<MAX_KEY;index++){ R}nvSerVb  
    if(hCallWnd[index]==NULL) *uc/| c  
     continue; Z`Y&cKsn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #e' >9T  
    { UA>=# $  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  %?ElC  
     bProcessed=TRUE; (dy(.4W\  
    } my (@~'  
   } Cj-s  
  } U,Z\)+-R  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 TSB2]uH  
   for(int index=0;index<MAX_KEY;index++){ 9@ k8$@  
    if(hCallWnd[index]==NULL) cOVj @z  
     continue; vpQ&vJfR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xl&@g)Jj  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); )DgXsT  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -D`1z?zHra  
   } nu0pzq\6  
  } J"`VA_[  
 } }]x \ `}o  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); YYWD\Y`8  
} @{Rb]d?&F?  
L'+bVP{L  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: Z-iU7 O  
4MgN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %_(vSpk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LV:L0D7y  
)/raTD  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ;ku>_sG-  
c4H6I~2Na  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x[0T$  
{ I dK*IA4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) KF%BX ~80C  
 { 69c4bT:b"  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 AyE*1 FD  
  SaveBmp(); .9J^\%JD  
  return FALSE; I9X \@ lTf  
 } H$`U] =s|  
 …… //其它处理及默认处理 ]LvP)0=  
} x3+ -wv  
#(^<qr   
S;~eI8gQ"  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 "N+4TfXy  
LU6R"c11  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 S?688  
vk7IqlEQ  
  二、编程步骤 }-3 VK%  
j7}mh  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; "laf:Ty1  
l2F#^=tp  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; *zdD4 I=  
Phn^0 iF  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; <cTX;&0=  
+XWTu!  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 72nZ`u  
\K$\-]N+  
  5、 添加代码,编译运行程序。 pwo$qs(p  
8"h;+;  
三、程序代码 T+Yv5l  
#2]*qgA4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL a6 Vfd&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) bxE~tsM"@Y  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ *7AB0y0k  
#if _MSC_VER > 1000 ka_m Q<{9  
#pragma once u62H+'k}F  
#endif // _MSC_VER > 1000 /pF8S!,z  
#ifndef __AFXWIN_H__ Xt$qjtVM  
#error include 'stdafx.h' before including this file for PCH j/t%7,  
#endif 3zsp 6kV  
#include "resource.h" // main symbols u!X~!h-6~  
class CHookApp : public CWinApp @Ou H=<YN  
{ 8F[ ];LF>  
 public: ]!ai?z%cK#  
  CHookApp(); sc*R:"  
  // Overrides (wu'FFJp#  
  // ClassWizard generated virtual function overrides -r *|N.5c  
  //{{AFX_VIRTUAL(CHookApp) It3k#A0  
 public: q^xG%YdPz+  
  virtual BOOL InitInstance(); ! $JX3mP  
  virtual int ExitInstance(); QGN+f)  
  //}}AFX_VIRTUAL vHvz-3  
  //{{AFX_MSG(CHookApp) 0MRWx%CR  
  // NOTE - the ClassWizard will add and remove member functions here. HzM\<YD  
  // DO NOT EDIT what you see in these blocks of generated code ! M6wH$!zRa  
  //}}AFX_MSG WN]k+0#  
  DECLARE_MESSAGE_MAP() +.Vh<:?  
}; 2)IM<rf'^  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >_j(uw?u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b_sasZo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G$,s.MSf  
BOOL InitHotkey(); 6aB]&WO1@  
BOOL UnInit(); du$lS':`  
#endif M"*NV(".g  
4A+g-{d  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. tQ@7cjq8bA  
#include "stdafx.h" $7YZ;=~B  
#include "hook.h" z#gebr~_\  
#include <windowsx.h> #~p;s>  
#ifdef _DEBUG &en2t=a  
#define new DEBUG_NEW e/hCYoS1n  
#undef THIS_FILE 6r"NU`1A;r  
static char THIS_FILE[] = __FILE__; _1)n_P4  
#endif E^J &?-  
#define MAX_KEY 100 \JPMGcL  
#define CTRLBIT 0x04 wfO -bzdw  
#define ALTBIT 0x02 aNry> 2:  
#define SHIFTBIT 0x01 RF*>U a  
#pragma data_seg("shareddata") G9Xkim Q'  
HHOOK hHook =NULL; 1tTP;C l#  
UINT nHookCount =0; 9]N{8  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey AyQ5jkIE^{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT t{UVX%b  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey MgP|'H3\  
static int KeyCount =0; 2MB>NM<xO  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift hqeknTGsIn  
#pragma data_seg() Xc+YoA0Ez  
HINSTANCE hins; xJw" 8V<  
void VerifyWindow(); l`~$cK!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) [;hkT   
//{{AFX_MSG_MAP(CHookApp) @F8NN\  
// NOTE - the ClassWizard will add and remove mapping macros here. b)a5LFt|  
// DO NOT EDIT what you see in these blocks of generated code! V}TPt6C2  
//}}AFX_MSG_MAP ] K&ca  
END_MESSAGE_MAP() ,Gy,bcv{  
pS-o*!\C.  
CHookApp::CHookApp() NI"Zocp  
{ #IGcQY  
 // TODO: add construction code here, uxdB}H,  
 // Place all significant initialization in InitInstance ThP~k9-  
} -J!n7  
lq-F*r\/~+  
CHookApp theApp; y}FG5'5$13  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) CD`6R.  
{ rhzI*nwOT  
 BOOL bProcessed=FALSE; cq]0|\Vz  
 if(HC_ACTION==nCode) xK0;saG#  
 { {R(/Usg!=  
  if((lParam&0xc0000000)==0xc0000000){// Key up 8yYag[m8  
   switch(wParam) }JOz,SQHP  
   { D*46,>Tv  
    case VK_MENU: ^xk4HF   
     MaskBits&=~ALTBIT; z1tD2jL_  
     break; B^M L}$  
    case VK_CONTROL: i:N-Q)<Q*)  
     MaskBits&=~CTRLBIT; _ \+0e:Ae  
     break; Z 9cb  
    case VK_SHIFT: Te!eM{_$T  
     MaskBits&=~SHIFTBIT; "=%YyH~WY  
     break; f dJg7r*  
    default: //judge the key and send message T+0z.E!~I  
     break; +R$;LtR  
   } I|bX;l  
   for(int index=0;index<MAX_KEY;index++){ h+d k2|a  
    if(hCallWnd[index]==NULL) [GM!@6U  
     continue; e7iQG@i7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) CNj |vYj  
    { ~ D/Lo$K"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >f9Q&c$R  
     bProcessed=TRUE; Y$^vA[]c>  
    } WSF$xC /~  
   } [vBP,_Tjx  
  } 7!o#pt7  
  else if((lParam&0xc000ffff)==1){ //Key down ?TDmW8G}J  
   switch(wParam) y q2AZ@}"  
   { (0_]=r=q  
    case VK_MENU: pi;fu  
     MaskBits|=ALTBIT; bQ?Vh@j(M  
     break; <vs*aFq  
    case VK_CONTROL: [$>@f{:  
     MaskBits|=CTRLBIT; $+{o*  
     break; BD.l5 ~:  
    case VK_SHIFT: ~y 2joStx  
     MaskBits|=SHIFTBIT; :[PA.Upi  
     break; -e51 /lhpd  
    default: //judge the key and send message _=[pW2p  
     break; F_}y[Yn^  
   } : @gW3'  
   for(int index=0;index<MAX_KEY;index++) CJ3/8*;w  
   { <g&GIFE,  
    if(hCallWnd[index]==NULL) zEE:C|50  
     continue; EN>a^B+!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D+BflI~9mP  
    { m*e8j[w#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); mCI5^%*0jQ  
     bProcessed=TRUE; O"[#g  
    } 1 j|XC  
   } d.>O`.Mu)}  
  } ]3U|K .G  
  if(!bProcessed){ m KKa0"  
   for(int index=0;index<MAX_KEY;index++){ xy)W_~Mk  
    if(hCallWnd[index]==NULL) *MWI`=c  
     continue; : T4ap_Ycq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lP(<4mdP  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); xnZ  
   } b3=XWzK5  
  } {!4ZRNy(k  
 } .?F`H[^)^u  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fhHTp_u)2  
} VM3)L>x]/  
} f!wQx b  
BOOL InitHotkey() Nc(A5*  
{ 4 $)}d  
 if(hHook!=NULL){ ZI!;~q  
  nHookCount++; ' b,zE[Q  
  return TRUE; h9%.tGx  
 } *; 6LX  
 else rN~V^k  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); i,y{*xBT  
  if(hHook!=NULL) *u34~v16,  
   nHookCount++; %)r1?H} #%  
  return (hHook!=NULL); @j r$4pM?  
} ,ce$y4%(  
BOOL UnInit() Nm0|U.<  
{ BLo=@C%w5  
 if(nHookCount>1){ $O9#4A;  
  nHookCount--; {f>e~o  
  return TRUE; *pGbcBQ  
 } j+3=&PkA.]  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .18MMzdN  
 if(unhooked==TRUE){ QJH~YV\%  
  nHookCount=0; OFlY"O S[  
  hHook=NULL; a&`Lfw"  
 } T "t%>g  
 return unhooked; n6GB2<y  
} W%}zwQ  
eOd'i{f@F  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4p(\2?B%f  
{ GplEad $  
 BOOL bAdded=FALSE; /3 ;t &]  
 for(int index=0;index<MAX_KEY;index++){ !2g*=oY  
  if(hCallWnd[index]==0){ iC<qWq|S_m  
   hCallWnd[index]=hWnd; %y\  
   HotKey[index]=cKey; NFb<fD[C  
   HotKeyMask[index]=cMask; Mg {=(No  
   bAdded=TRUE; 5q.)K f+  
   KeyCount++; ohB@ijC!  
   break; G+Zm  
  } K!SFS   
 } 1:q5h*  
 return bAdded; yUFT9bD  
} Ne2eBmY}(  
J?bx<$C@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ywbdV-t/  
{ Sa$-Yf  
 BOOL bRemoved=FALSE; ;XGO@*V5T  
 for(int index=0;index<MAX_KEY;index++){ IdWFG?b3  
  if(hCallWnd[index]==hWnd){ fnU;DS] W  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 4Y}{?]>pu  
    hCallWnd[index]=NULL; S8)6@ECC  
    HotKey[index]=0; $2pkh%  
    HotKeyMask[index]=0; Zm/I&  
    bRemoved=TRUE; Ouc$M2m0!  
    KeyCount--; 7,Q>>%/0P  
    break; 5'[b:YC  
   } E(Y}*.\]#s  
  } j q1 |`:  
 } ]*vv=@"`e  
 return bRemoved; 3etW4  
} QNgfvy  
(<xl _L:*.  
void VerifyWindow() _ "H&  
{ W(,3j{d2i  
 for(int i=0;i<MAX_KEY;i++){ h_K!ch }  
  if(hCallWnd!=NULL){ y` 6!Vj l  
   if(!IsWindow(hCallWnd)){ K0] 42K  
    hCallWnd=NULL; L~>~a1p!  
    HotKey=0; 78/,rp#'_  
    HotKeyMask=0; % *Lv  
    KeyCount--; ~~X-$rtU  
   } (od9adSehV  
  } q2~@z-q)b  
 } n]fMl:77  
} QNm8`1  
jdAjCy;s!  
BOOL CHookApp::InitInstance() F!&$Z .  
{ yw+LT,AQ.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); x /E<@?*:  
 hins=AfxGetInstanceHandle(); $ucA.9pJ  
 InitHotkey(); .I nDyKt  
 return CWinApp::InitInstance(); zX}t1:nc  
} VQwF9Iq]`  
R-J^%4U`7  
int CHookApp::ExitInstance() ~"nF$DB  
{ Dg o -Os@  
 VerifyWindow(); u@pimRVo  
 UnInit(); 3  G_0DS  
 return CWinApp::ExitInstance(); ,v$Q:n|  
} 9vI<\ Xa  
LeaJ).Maw  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D,P{ ,/  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &r)[6a$fW  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ FE,BvNBZ  
#if _MSC_VER > 1000 ZGj ^,?a  
#pragma once pq$-s7#  
#endif // _MSC_VER > 1000 m6Mko2  
dpSNh1  
class CCaptureDlg : public CDialog  jH>`:  
{ wGg_ vAn  
 // Construction WJj5dqatV  
 public: 85?;\ 5%-  
  BOOL bTray; +^|_vq^XR  
  BOOL bRegistered; O_\%8*;  
  BOOL RegisterHotkey(); g0ks[ }f-  
  UCHAR cKey; a&RH_LjM  
  UCHAR cMask; qV7 9bK  
  void DeleteIcon(); |ya.c\}q  
  void AddIcon(); 1V.oR`&2E  
  UINT nCount; SNtk1pG>  
  void SaveBmp(); zd|n!3;  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Hg5 :>?Lw@  
  // Dialog Data @L$!hTaP  
  //{{AFX_DATA(CCaptureDlg) oju,2kpH7#  
  enum { IDD = IDD_CAPTURE_DIALOG }; QtQbr*q@%  
  CComboBox m_Key; GRh430V [  
  BOOL m_bControl; 0p]v#z}  
  BOOL m_bAlt; 49.B!DqQW&  
  BOOL m_bShift; gVNoC-n)  
  CString m_Path; +}R#mco5K  
  CString m_Number; VYjt/\ Z  
  //}}AFX_DATA OE*Y%*b  
  // ClassWizard generated virtual function overrides i&YWutG  
  //{{AFX_VIRTUAL(CCaptureDlg) +/ rt'0o  
 public: 6=:s3I^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1Li*n6tLX`  
 protected: _ee<i8_Va  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support TJCE6QG  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); e|N~tUVrrN  
  //}}AFX_VIRTUAL ;SIWWuk  
  // Implementation A `{hKS  
 protected: vUCmm<y  
  HICON m_hIcon; +z 4E:v  
  // Generated message map functions 2Qt!JXC  
  //{{AFX_MSG(CCaptureDlg) McpQ7\*h  
  virtual BOOL OnInitDialog(); ,Qs%bq{t  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !2h ZtX  
  afx_msg void OnPaint(); .,20_<j%=  
  afx_msg HCURSOR OnQueryDragIcon(); F1A40h7R$Y  
  virtual void OnCancel(); DD2K>1A1  
  afx_msg void OnAbout(); V';l H2  
  afx_msg void OnBrowse(); *YSRZvD<\  
  afx_msg void OnChange(); zz /4 ()u  
 //}}AFX_MSG &r\8VEZq"  
 DECLARE_MESSAGE_MAP() R0%M9;>1  
}; G[1\5dK*uR  
#endif axpZ`BUc  
;tSA Q  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file K`2(Q  
#include "stdafx.h" tv26eK 38  
#include "Capture.h" sM+~x<}0  
#include "CaptureDlg.h" Pt f(p`  
#include <windowsx.h> { :1X N  
#pragma comment(lib,"hook.lib") e[16 7uU  
#ifdef _DEBUG q k 6  
#define new DEBUG_NEW ?xrOhA9  
#undef THIS_FILE 5'c#pm\Q  
static char THIS_FILE[] = __FILE__; R<U]"4CBx  
#endif |R1T;J<[  
#define IDM_SHELL WM_USER+1 uKXNzz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); GX0zirz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 3H`{ A/r  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; a{.q/Tbt  
class CAboutDlg : public CDialog pQKSPr  
{ #-@u Lc  
 public: >=|p30\b  
  CAboutDlg(); -rn6ZSD)  
  // Dialog Data Mx$&{.LFJ  
  //{{AFX_DATA(CAboutDlg) e"52'zAV-  
  enum { IDD = IDD_ABOUTBOX }; n{i,`oQ"  
  //}}AFX_DATA c(e>Rmh  
  // ClassWizard generated virtual function overrides #K6cBfqI  
  //{{AFX_VIRTUAL(CAboutDlg) H#DvCw  
 protected: BqY_N8l&E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support `/ayg:WSU  
  //}}AFX_VIRTUAL  +l/v`=C  
  // Implementation 8M@'A5]  
 protected: mr^3Y8 $s  
  //{{AFX_MSG(CAboutDlg) {X&lgj  
  //}}AFX_MSG JD~;.3$/k  
  DECLARE_MESSAGE_MAP() qQi\/~Y[:  
}; KGHSEZi]  
6oNcj_?7?q  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %KXiB6<4  
{ p.SipQ.P  
 //{{AFX_DATA_INIT(CAboutDlg) b1Kt SRLV  
 //}}AFX_DATA_INIT `om+p?j  
} %^pi  
yGf7k>K'  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 7l=;I%  
{ w_xca(  
 CDialog::DoDataExchange(pDX); $Sgf jm  
 //{{AFX_DATA_MAP(CAboutDlg) ksOGCd^G7  
 //}}AFX_DATA_MAP ( %\7dxiK  
} @)?]u U"L  
^,acU\}VqP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) cKe%P|8  
 //{{AFX_MSG_MAP(CAboutDlg) *[3xc*5F/A  
 // No message handlers ^taN?5  
 //}}AFX_MSG_MAP ^AS \a4`/  
END_MESSAGE_MAP() |)29"_Kk5  
H<Oo./8+  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .h7s.p?  
: CDialog(CCaptureDlg::IDD, pParent) $/++afi m  
{ t'v t'[~,U  
 //{{AFX_DATA_INIT(CCaptureDlg) IW 3k{z  
  m_bControl = FALSE; ,vJt!}}  
  m_bAlt = FALSE; Nr4:Gih  
  m_bShift = FALSE; 4hL%J=0:  
  m_Path = _T("c:\\"); @1JwjtNk  
  m_Number = _T("0 picture captured."); LH8jT  
  nCount=0; `hi=y BO  
  bRegistered=FALSE; :$MOdLr  
  bTray=FALSE;  5&&4-  
 //}}AFX_DATA_INIT f"QiVJq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #) aLD0p  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Ey&H?OFiP  
} QF#w $%7  
` p\=NP!n  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) T{k P9 4  
{ Ke\\B o,  
 CDialog::DoDataExchange(pDX); N+|NI?R?}  
 //{{AFX_DATA_MAP(CCaptureDlg) mL{P4a 1xf  
  DDX_Control(pDX, IDC_KEY, m_Key); jwDlz.sW!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _FY&XL=  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }TmOoi(X@  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); sgX!4wG&Z  
  DDX_Text(pDX, IDC_PATH, m_Path); H}^'  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5p;AON  
 //}}AFX_DATA_MAP 8M,*w6P  
} zX>W 8P  
ti\ ${C3  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) KA5)]UF`l  
//{{AFX_MSG_MAP(CCaptureDlg) t]yxLl\  
 ON_WM_SYSCOMMAND() kQ`tY`3F  
 ON_WM_PAINT() /`*{57/3  
 ON_WM_QUERYDRAGICON() " O&93#8  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) N:1aDr;  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -8TJ:#|N  
 ON_BN_CLICKED(ID_CHANGE, OnChange) .DCHc,DxA  
//}}AFX_MSG_MAP Z'z)Oo  
END_MESSAGE_MAP() 7L{1S v  
~M C|  
BOOL CCaptureDlg::OnInitDialog() AM}R#86  
{ <n2@;` D  
 CDialog::OnInitDialog(); M";qo6  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 37#&:[w>  
 ASSERT(IDM_ABOUTBOX < 0xF000); IC`3%^  
 CMenu* pSysMenu = GetSystemMenu(FALSE); SepjF  
 if (pSysMenu != NULL) Dp@XAyiA[  
 { IGdiIhH~2  
  CString strAboutMenu; gq+SM  i=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); t un}rdb  
  if (!strAboutMenu.IsEmpty()) #@XBHJD\#  
  { {keZ_2  
   pSysMenu->AppendMenu(MF_SEPARATOR); ]ss[n.T0*  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); eA/n.V$z  
  } 4"d,=P.{  
 } m5\T,  
 SetIcon(m_hIcon, TRUE); // Set big icon h3ygL"k  
 SetIcon(m_hIcon, FALSE); // Set small icon Kl1v^3\{  
 m_Key.SetCurSel(0); w_9^YO! !  
 RegisterHotkey(); `KJ( .m  
 CMenu* pMenu=GetSystemMenu(FALSE); ZoW1Cc&p  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); pGbfdX  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); #8$?# dT  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); h<9s& p  
 return TRUE; // return TRUE unless you set the focus to a control  *}?[tR5  
} s\*L5{kiSl  
R+ * ; [  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) d t/AAk6  
{ }K{1Bm@S  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }0'=}BE  
 { XlmX3RU  
  CAboutDlg dlgAbout; 6FUW^dt  
  dlgAbout.DoModal(); m4:c$5  
 } ]33!obM  
 else zj 6I:Q r  
 { MK&,2>m,A  
  CDialog::OnSysCommand(nID, lParam); |23F@s1  
 } 87 Z[0>  
} ER0 Yl  
&D, Iwq  
void CCaptureDlg::OnPaint() _^NX`<&  
{ s :vNr@TS  
 if (IsIconic()) gf|uZ9{  
 { ~Y 6'sM|  
  CPaintDC dc(this); // device context for painting ,OE&e* 1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *a9cBl'_  
  // Center icon in client rectangle P/%7kD@5;  
  int cxIcon = GetSystemMetrics(SM_CXICON); _NDQ2O  
  int cyIcon = GetSystemMetrics(SM_CYICON); z@*E=B1L  
  CRect rect; Od1\$\4Z  
  GetClientRect(&rect); bI):-2&s}  
  int x = (rect.Width() - cxIcon + 1) / 2; 'aSsyD!?<  
  int y = (rect.Height() - cyIcon + 1) / 2; :F(4&e=w  
  // Draw the icon +^.Yt0}  
  dc.DrawIcon(x, y, m_hIcon); Tz @<hE  
 } m`yvZ4K!  
 else lriezI  
 { UXm_-/&b9  
  CDialog::OnPaint(); L/k35x8  
 } jqUVERbc  
} 0'^M}&zCi  
!np_B0`  
HCURSOR CCaptureDlg::OnQueryDragIcon() -@v^. @[Z&  
{ (tK_(gO  
 return (HCURSOR) m_hIcon; qv!(In>u  
} =RoE=) 1&-  
L&\W+k  
void CCaptureDlg::OnCancel() xIdb9hm<  
{ Ly= .  
 if(bTray) Xdvd\H=  
  DeleteIcon(); Nr|Gw @+  
  CDialog::OnCancel(); 0s n$QmW:  
} K\xz|Gq  
\!ZA#7  
void CCaptureDlg::OnAbout() X3:1KDVsV  
{ o&JoeKXor  
 CAboutDlg dlg; &3vm @  
 dlg.DoModal(); ?QP>rm  
} 2&hv6Y1  
SKG U)Rn;  
void CCaptureDlg::OnBrowse() n:AZ(f   
{ SSe;&Jk2d  
 CString str; :ez76oGyc  
 BROWSEINFO bi; y-pdAkDh  
 char name[MAX_PATH]; rwWOhD)RU  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); {_7hX`p  
 bi.hwndOwner=GetSafeHwnd(); *|&Y ,H?  
 bi.pszDisplayName=name; 1P)K@j  
 bi.lpszTitle="Select folder"; mnTF40l  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |W@ ~mrO  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 1wgL^Qz@  
 if(idl==NULL) f6r!3y  
  return; Tv%7=P;r  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); PKlR_#EB?  
 str.ReleaseBuffer(); :tWk K$  
 m_Path=str; r] /Ej!|  
 if(str.GetAt(str.GetLength()-1)!='\\') LWrYK i  
  m_Path+="\\"; XX=OyDLqP  
 UpdateData(FALSE); =svFw&q"  
} QL0q/S1*  
,e'r 0  
void CCaptureDlg::SaveBmp() m2SJ\1 J=  
{ "8Dm7)nB  
 CDC dc; }$)~HmZw  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); XT/t\\Z`U  
 CBitmap bm; gmp@ TY=:L  
 int Width=GetSystemMetrics(SM_CXSCREEN); A6z2KVk  
 int Height=GetSystemMetrics(SM_CYSCREEN); $uLTYu  
 bm.CreateCompatibleBitmap(&dc,Width,Height); +149 o2  
 CDC tdc; c@A.jc  
 tdc.CreateCompatibleDC(&dc); kTjn%Sn,  
 CBitmap*pOld=tdc.SelectObject(&bm); =1Plu5  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 2K4Xu9-i:b  
 tdc.SelectObject(pOld); =2q#- ,t  
 BITMAP btm; wn"\ @QvG  
 bm.GetBitmap(&btm); CUDA<Fm  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Zx8$M5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jd]L}%ax  
 BITMAPINFOHEADER bih; 7,)E1dx -V  
 bih.biBitCount=btm.bmBitsPixel; -|x7<$Hw  
 bih.biClrImportant=0; OcB&6!1u  
 bih.biClrUsed=0; IAA_Ft  
 bih.biCompression=0; 'qVlq5.  
 bih.biHeight=btm.bmHeight; Fs >MFj  
 bih.biPlanes=1; H2iIBGu|L  
 bih.biSize=sizeof(BITMAPINFOHEADER); f0eQq;D$K  
 bih.biSizeImage=size; ZQ"dAR/y  
 bih.biWidth=btm.bmWidth; *vQ 6LF;y  
 bih.biXPelsPerMeter=0; FM%WMyb[  
 bih.biYPelsPerMeter=0; J"#6m&R_q  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); iK2f]h  
 static int filecount=0; A}! A*z<9  
 CString name; |>P:R4P  
 name.Format("pict%04d.bmp",filecount++); AK lr a$  
 name=m_Path+name; 2V 8 "jc  
 BITMAPFILEHEADER bfh; ke@OG! M/  
 bfh.bfReserved1=bfh.bfReserved2=0; `D3q!e  
 bfh.bfType=((WORD)('M'<< 8)|'B'); xTk6q*NvT^  
 bfh.bfSize=54+size; .|"E:qTD  
 bfh.bfOffBits=54; I3Co   
 CFile bf; c}v8j2{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %cs" PS  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yl*%P3m|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wo62R&ac  
  bf.WriteHuge(lpData,size); 37n2#E  
  bf.Close(); l`75BR  
  nCount++; pv4#`.m  
 } t .&JPTK-H  
 GlobalFreePtr(lpData); D=LsoASVI  
 if(nCount==1) uih8ZmRt  
  m_Number.Format("%d picture captured.",nCount); uJ|,-"~F  
 else ,nog6\  
  m_Number.Format("%d pictures captured.",nCount); GQ85ykky  
  UpdateData(FALSE); d~.hp  
} Gqq< -drR  
a^G>|+8  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) + S5uxO  
{ i Ya)*,  
 if(pMsg -> message == WM_KEYDOWN) A?-t`J  
 { }ub>4N[  
  if(pMsg -> wParam == VK_ESCAPE) \k$cg~  
   return TRUE; >;G7ty[RX7  
  if(pMsg -> wParam == VK_RETURN) F:Vl\YZ  
   return TRUE; R {-M%n4w  
 } f&F9ImZ  
 return CDialog::PreTranslateMessage(pMsg); dtQ3iuV %  
} U_9|ED:  
dXWG`G_  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'mv|6Y  
{ SXXO#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ '[[IalQ?  
  SaveBmp(); V[8!ymi0  
  return FALSE; nbw8YO(=  
} g5nL7;`N  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T_\hhP~  
 CMenu pop; Nog{w  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); YYe<StyH  
 CMenu*pMenu=pop.GetSubMenu(0); 8XfOM f~d`  
 pMenu->SetDefaultItem(ID_EXITICON); X#W6;?Z\  
 CPoint pt; SbtZhg=S_  
 GetCursorPos(&pt); SQ/}K8uZ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j<?k$ 8H  
 if(id==ID_EXITICON) n>o=RQ2  
  DeleteIcon(); us#ji i.<  
 else if(id==ID_EXIT) Rs'mk6+  
  OnCancel(); HT_nxe`E  
 return FALSE; 7*+tG7I @  
} 47 &p*=  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -t*P=V|@  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0LWV.OIIC  
 AddIcon(); gE23C*!'&:  
 return res; ! 4 "$O@U4  
} 9:!V":8q  
e9F+R@8  
void CCaptureDlg::AddIcon() }.A \;FDyj  
{ B I>r'  
 NOTIFYICONDATA data; _k)EqPYu@  
 data.cbSize=sizeof(NOTIFYICONDATA); [xDn=)`{V  
 CString tip; ;%/}(&E2  
 tip.LoadString(IDS_ICONTIP); 7Zh#7jiZ`  
 data.hIcon=GetIcon(0); %pxHGO=)E  
 data.hWnd=GetSafeHwnd(); PmUq~YZ7  
 strcpy(data.szTip,tip); 5n=~l[O  
 data.uCallbackMessage=IDM_SHELL; 1mv8[^pF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; S2V+%Z _J  
 data.uID=98; ;k=`J  
 Shell_NotifyIcon(NIM_ADD,&data); r#mH[|@W~  
 ShowWindow(SW_HIDE); ]%(X }]}  
 bTray=TRUE; _]kw |[)  
} 8$ _8Yva"e  
P.Qz>c^-C  
void CCaptureDlg::DeleteIcon() hIo ^/_K  
{ za5E{<0  
 NOTIFYICONDATA data; E`q)vk   
 data.cbSize=sizeof(NOTIFYICONDATA); Zx|VOl,;  
 data.hWnd=GetSafeHwnd(); ou\~^  
 data.uID=98; [58qC:  
 Shell_NotifyIcon(NIM_DELETE,&data); {%v{iE>  
 ShowWindow(SW_SHOW); U5;Y o+z  
 SetForegroundWindow(); %hA0  
 ShowWindow(SW_SHOWNORMAL); %Xl(wvd   
 bTray=FALSE; dJ7!je1N*  
} )Q~K\bJf  
U1pwk[  
void CCaptureDlg::OnChange() #PMi6q~Z  
{ o[k,{`M0  
 RegisterHotkey(); _lZWy$rm%  
} NY%=6><t!  
'Fa~l'G7X  
BOOL CCaptureDlg::RegisterHotkey() %xN91j["  
{ aB~=WWLR\  
 UpdateData(); 'dd[= vzK  
 UCHAR mask=0; wN$u^]  
 UCHAR key=0; ?_@Mg\Hc  
 if(m_bControl)  tZN'OoZ  
  mask|=4; 0?,%B?A8O  
 if(m_bAlt) 9y;8JO  
  mask|=2; (x8D ]a  
 if(m_bShift) NfXEW-  
  mask|=1; l\t<_p/I)^  
  key=Key_Table[m_Key.GetCurSel()]; a>)|SfsE  
 if(bRegistered){ -h#9sl->  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); LVNJlRK  
  bRegistered=FALSE; -hP>;~*4  
 } +r 8/\'u-  
 cMask=mask; 1|H(q  
 cKey=key; -e_L2<7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Qg gx:  
 return bRegistered; Tf.DFfV#y  
} nCdxn#|  
eW;0{P  
  四、小结 ;+R  
\t%rIr  
  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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