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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: ~"{Kjr#R  
  aS:17+!  
  一、实现方法 HOXqIZN85  
5Sk87o1E(d  
  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: qH"e: wgL  
8(&C0_yD  
#pragma data_seg("shareddata") b\H~Ot[i  
HHOOK hHook =NULL; //钩子句柄 2I6c7H s  
UINT nHookCount =0; //挂接的程序数目 BQt!L1))  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码  03_tt7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Rl<~:,D  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ~(G]-__B<  
static int KeyCount =0; F|Jo|02  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 kXv -B-wOj  
#pragma data_seg() 4z?6[Cg<  
7&OU!gp  
  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。 5ahAp];  
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  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: Rnun() plJ  
p4|:u[:&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR eDIjcZ  
cKey,UCHAR cMask) ld`oIEj!P_  
{ c tTbvXP  
 BOOL bAdded=FALSE; >.QD:_@:  
 for(int index=0;index<MAX_KEY;index++){ q4lL7@_  
  if(hCallWnd[index]==0){ ,SS@]9A &  
   hCallWnd[index]=hWnd; ow%s_yV]R  
   HotKey[index]=cKey; F5{~2~Cw(  
   HotKeyMask[index]=cMask; zgqe@;{  
   bAdded=TRUE; 8[ :FU  
   KeyCount++; A+NLo[swwu  
   break; D",ZrwyJ  
  } )7[>/2aGd  
 } ka*VQXk*  
 return bAdded; Up)b;wR  
} n%@xnB $ZX  
//删除热键 ) T 3y,*  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lv,8NmP5  
{ x)nBy)<  
 BOOL bRemoved=FALSE; lOcvRF  
 for(int index=0;index<MAX_KEY;index++){ pO GVD  
  if(hCallWnd[index]==hWnd){ Y KeOH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ nBZqhtr  
    hCallWnd[index]=NULL; _9""3O  
    HotKey[index]=0; '<$(*  
    HotKeyMask[index]=0; $Omc Ed  
    bRemoved=TRUE; dt^yEapjM  
    KeyCount--; ATH0n>)  
    break; Qx'a+kLu9  
   } W!V06.  
  } Yq3(,  
 } h}rrsVj3  
 return bRemoved; @N"h,(^  
} NTls64AS.  
?cowey\m .  
Z'PL?;&+R  
  DLL中的钩子函数如下: lg;`ItX]  
(Q\QZu@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y Q3%vH5#y  
{ .lTU[(qwu  
 BOOL bProcessed=FALSE; ${0Xq k  
 if(HC_ACTION==nCode) "kVN|Do  
 { 7H++ pOF  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Q->'e-\E<"  
   switch(wParam) ~\Fde^1  
   {  &I<R|a  
    case VK_MENU: 2mVH*\D  
     MaskBits&=~ALTBIT; i#iY;R8  
     break; )6^b\`  
    case VK_CONTROL: Vr`UF0_3q  
     MaskBits&=~CTRLBIT; z35n3q  
     break; ke'p8Gz  
    case VK_SHIFT: VqbMFr<k  
     MaskBits&=~SHIFTBIT; 9{?<.%  
     break; 24>{T5E  
    default: //judge the key and send message oI/@w  
     break; * vEG%Y  
   } ?r2Im5N  
   for(int index=0;index<MAX_KEY;index++){ N{L]H _=  
    if(hCallWnd[index]==NULL) E&GUg/d  
     continue; a(BWV?A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +!'6:F  
    { W;OxH"eC  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); J+w"{ O  
     bProcessed=TRUE; {b7P1}>-*  
    } XZJ}nXy  
   } /$]dVvhX%  
  } 5H""_uw  
  else if((lParam&0xc000ffff)==1){ //有键按下 C7eaioW$  
   switch(wParam) IeZ}`$[H  
   { j#<#o:If  
    case VK_MENU: DZ(e^vq  
     MaskBits|=ALTBIT; rL&585  
     break; c|hKo[r)  
    case VK_CONTROL: wF$8#=  
     MaskBits|=CTRLBIT; 3sHC1 +  
     break; HOtays,#<}  
    case VK_SHIFT: KvkiwO(  
     MaskBits|=SHIFTBIT; E':y3T@."  
     break; g6;O)b  
    default: //judge the key and send message nu4GK}xI  
     break; H /*^$>0Uo  
   } >x (^g~i  
   for(int index=0;index<MAX_KEY;index++){ mzfj!0zR*  
    if(hCallWnd[index]==NULL) |o|0qG@g  
     continue; ,r:. 3.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) S!up2OseW  
    { `"Tx%>E(U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2p(K0PtX  
     bProcessed=TRUE; O BF5Tl4  
    }  oC >^V5  
   } Y&]pC  
  } Ab cmI*y  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 |P>> ^,iUn  
   for(int index=0;index<MAX_KEY;index++){ 2px l!  
    if(hCallWnd[index]==NULL) /vwGSuk._  
     continue; VL7zU->  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) OfbM]:}<3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ) l0=j b  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 j;J4]]R;o  
   } 2Q-kD?PO,  
  } T1\.~]-msb  
 } ZWh:&e(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \ bd? `."  
} a~:'OW:Q  
!@p@u;djJ  
  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: [ wr0TbtV  
Xp4pN{he  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); &&Vz=6N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s <Ag8U8  
oC^-" (#  
  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: rM_8piD  
^mkplp a  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y =G  
{ |!flR? OU  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) .lOEQLt  
 { 11%^K=dq  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 $ [M8G   
  SaveBmp(); Cf@WjgR  
  return FALSE; <?2[]h:wp  
 } s{Ryh.IyI  
 …… //其它处理及默认处理 Y]^[|e8  
} M5[AA/@  
wvBJ?t,  
7f~.Qus  
  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。 QU8?/  
h9 [ov)  
  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。 ZYc)_Og  
lH T?  
  二、编程步骤 !sK{:6s  
5lVDYmh  
  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"; co yy T  
[gqV}Y"Md  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Q<wrO  
KZsSTB6J  
  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; {CYFM[V  
f*p=]]y  
  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; o%RyE]pw,  
Y{f;qbEQH'  
  5、 添加代码,编译运行程序。 mst-:F[h  
2PAo tD4+I  
三、程序代码 Z_ak4C  
?.,..p  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL bCy.S.`jHQ  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) F3;UH%L1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ : v<|y F  
#if _MSC_VER > 1000 vqJiMa j@Z  
#pragma once 6- s/\  
#endif // _MSC_VER > 1000 m80QMosp  
#ifndef __AFXWIN_H__ u\<z5O  
#error include 'stdafx.h' before including this file for PCH l" *zr ;#  
#endif Xj.6A,}^  
#include "resource.h" // main symbols qMmh2a&  
class CHookApp : public CWinApp WVir[Kv%  
{ o~*% g.  
 public: mj{TqF  
  CHookApp(); rB< UOe  
  // Overrides EO:i+e]=  
  // ClassWizard generated virtual function overrides |z-A;uL<  
  //{{AFX_VIRTUAL(CHookApp) v0apEjT  
 public: &3:-(:<U  
  virtual BOOL InitInstance(); n]r7} 2hM  
  virtual int ExitInstance(); roVGS{4T\  
  //}}AFX_VIRTUAL B24wn8<  
  //{{AFX_MSG(CHookApp) [(F.x6z)  
  // NOTE - the ClassWizard will add and remove member functions here. mC8c`# 1T  
  // DO NOT EDIT what you see in these blocks of generated code ! _r?H by<b  
  //}}AFX_MSG d+\o>x|Y!Y  
  DECLARE_MESSAGE_MAP() ApG_Gd.  
}; Vyf r>pgW1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); G  ZDyw9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8I$>e (  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 9V9K3xWn  
BOOL InitHotkey(); _RST[B.u6  
BOOL UnInit(); zL+jlUkE  
#endif !w(J]<  
gC> A *~J;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. [K9l>O  
#include "stdafx.h" p>Qzz`@e  
#include "hook.h" -V%"i,t  
#include <windowsx.h> )4bBR@QM  
#ifdef _DEBUG s%1O}X$c  
#define new DEBUG_NEW "fU=W|lY  
#undef THIS_FILE 4703\ HK  
static char THIS_FILE[] = __FILE__; v8 I&~_b  
#endif %}J[EV  
#define MAX_KEY 100 XBh0=E?qiS  
#define CTRLBIT 0x04 }N&}6U  
#define ALTBIT 0x02 H"=%|/1M0  
#define SHIFTBIT 0x01 !NuiVC]  
#pragma data_seg("shareddata") .-awl1 W  
HHOOK hHook =NULL; O@ F0UM`!  
UINT nHookCount =0; AVF(YD<U  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %-/[.DYt  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT gp`$/ci  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~a^mLnY@  
static int KeyCount =0; *GH` u*C_  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift f(6`5/C  
#pragma data_seg() w/IYQC\v  
HINSTANCE hins; 04D>h0yFf  
void VerifyWindow(); b8r?Dd"T8  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) '=Nb`n3%  
//{{AFX_MSG_MAP(CHookApp) mCb(B48]%X  
// NOTE - the ClassWizard will add and remove mapping macros here. o:W>7~$jr=  
// DO NOT EDIT what you see in these blocks of generated code! Ej~vp2  
//}}AFX_MSG_MAP  iVu  
END_MESSAGE_MAP() KLBU8%  
nD@/,kw"  
CHookApp::CHookApp()  _zvCc%  
{ %@k@tD6  
 // TODO: add construction code here, PzMJ^H{  
 // Place all significant initialization in InitInstance m(i84~  
} 7l/.f SW  
7/& i'y  
CHookApp theApp; 3LN+gXmU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]w`)"{j5m  
{ <2"'R(4",  
 BOOL bProcessed=FALSE; WXV(R,*Tc  
 if(HC_ACTION==nCode) q^; SZ^yW5  
 { )CJXk zOX  
  if((lParam&0xc0000000)==0xc0000000){// Key up -d1 YG[1|  
   switch(wParam) Z$LWZg  
   { dWqKt0uh!  
    case VK_MENU: ?<)4_  
     MaskBits&=~ALTBIT; ~_8Dv<"a  
     break; #I8)|p?P  
    case VK_CONTROL: I$7|?8  
     MaskBits&=~CTRLBIT; wI8  
     break; \@&oK2f  
    case VK_SHIFT: "\cDSiD  
     MaskBits&=~SHIFTBIT; JZI)jIh  
     break; 2[ = =  
    default: //judge the key and send message <:/Lap#D^  
     break; (VV5SvdE  
   } 6 <XQ'tM]N  
   for(int index=0;index<MAX_KEY;index++){ N-Fs-uB  
    if(hCallWnd[index]==NULL) h;cl+c|B  
     continue; DB%}@IW"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -@L7! ,j  
    { =z^ 2KH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); m#1 >y}  
     bProcessed=TRUE; fGj YWw  
    } |>|f?^  
   } i^T@jg+K  
  } D+m#_'ocL  
  else if((lParam&0xc000ffff)==1){ //Key down _/V <iv  
   switch(wParam) -LzkM"  
   { \A7{kI  
    case VK_MENU: 1Xzgm0OS;  
     MaskBits|=ALTBIT; G\&9.@`k  
     break; mv] .  
    case VK_CONTROL: fE`p  
     MaskBits|=CTRLBIT; IUf&*'_  
     break; uPCzs$R  
    case VK_SHIFT: V6Z~#=EQ  
     MaskBits|=SHIFTBIT; $~7uDq  
     break; ^/]w}C#:d  
    default: //judge the key and send message M^IEu }  
     break; ?#s9@R1  
   } " GRR,7A  
   for(int index=0;index<MAX_KEY;index++) & pHSX  
   { bUvVt3cm  
    if(hCallWnd[index]==NULL) Z5/*i un  
     continue; ,Tp:. "  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) tV?-   
    { *.%z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); q)j b9e   
     bProcessed=TRUE; m.F}9HI%hN  
    } GdN9bA&,  
   } W4Z8U0co  
  } mR,w~wP  
  if(!bProcessed){ dCA| )  
   for(int index=0;index<MAX_KEY;index++){ 9K!kU6Gh  
    if(hCallWnd[index]==NULL) .`p,pt;  
     continue; B7x( <!B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 5PY4PT=G  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;k ?Z,M:  
   } FEY_(70  
  } [=<vapZt  
 } Me 5Xd|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); RN^<bt{_U  
} K* R  
[nc-~T+Mo  
BOOL InitHotkey() ca=sc[ $+  
{ sqXwDy+.  
 if(hHook!=NULL){ M$u.lI  
  nHookCount++; { 9:vq|  
  return TRUE; <+y%k~("  
 } "m#17J_  
 else K_! R   
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0<i8 ;2KD  
  if(hHook!=NULL) i?wEd!=w  
   nHookCount++; >}T}^F  
  return (hHook!=NULL); '\B0#z3  
} r 4 $<,~  
BOOL UnInit() kB` @M>[  
{ e"#QUc(  
 if(nHookCount>1){ niA>afo  
  nHookCount--; 1.0:  
  return TRUE; a = *'  
 } bG)EZ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); o$QC:%[#  
 if(unhooked==TRUE){ s(Y2]X4 (  
  nHookCount=0; `cQAO1-5  
  hHook=NULL; } ~NM\rm  
 } CCHGd&\Z  
 return unhooked; Nl]_Ie6  
} aD^jlt  
NufRd/q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w#v-h3XcF  
{ |LV}kG(2  
 BOOL bAdded=FALSE; *I:a \o~$[  
 for(int index=0;index<MAX_KEY;index++){ )\KU:_l  
  if(hCallWnd[index]==0){ ~xLo0EV "  
   hCallWnd[index]=hWnd; mzf~qV^T  
   HotKey[index]=cKey; mE\)j*Nnv  
   HotKeyMask[index]=cMask; mzRH:HgN?  
   bAdded=TRUE; 63E)RR_Lh  
   KeyCount++; 2c*w{\X  
   break; / Q| Z&-c  
  } B?%e-xV-  
 } 15z(hzU?#  
 return bAdded; IayF<y,8  
} R]&lVXyH  
S5BS![-QK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L35]'Jua  
{ oeYUsnsbi  
 BOOL bRemoved=FALSE; 2= Y8$-  
 for(int index=0;index<MAX_KEY;index++){ cYgd1  
  if(hCallWnd[index]==hWnd){ ' hDs.Wnu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ CKnPMvmz  
    hCallWnd[index]=NULL; 2T?8{yO7  
    HotKey[index]=0; YEa<zhO8  
    HotKeyMask[index]=0; B/*\Ih9y  
    bRemoved=TRUE; s !IvUc7'  
    KeyCount--; 8e5imei  
    break; W(}2R>$  
   } b*(, W  
  } p;qFMzyS9  
 } ,. zHG  
 return bRemoved; I`77[  
} `_()|;!y  
o)f$ 7.  
void VerifyWindow() oI5^.Dr FW  
{ `>4"i+NFF8  
 for(int i=0;i<MAX_KEY;i++){ 5g%D0_e5  
  if(hCallWnd!=NULL){ y@@h)P#  
   if(!IsWindow(hCallWnd)){ ( Sjlm^bca  
    hCallWnd=NULL; z}Lf]w?  
    HotKey=0; Y[N@ )E_G  
    HotKeyMask=0; 6u'E}hAx|  
    KeyCount--; -d9L  
   } :9DyABK=Cv  
  } \JC_"gqt  
 } 2 g~W})e  
} 75pn1*"gQ  
*JRM(V+IEv  
BOOL CHookApp::InitInstance() j0^1BVcj  
{ ZkWMo= vL  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); [b+B"f6  
 hins=AfxGetInstanceHandle(); O]Ey@7 &  
 InitHotkey(); JXV#V7  
 return CWinApp::InitInstance(); ev #/v:$?  
} 9?q ^yy  
nA(5p?D+YB  
int CHookApp::ExitInstance() Y <`X$  
{ ~g9~D}48k'  
 VerifyWindow(); 4k9$' k  
 UnInit(); d/3bE*gr  
 return CWinApp::ExitInstance(); n/Dg)n?  
} e,xJ%f  
i[4!% FxB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file {Hie% 2V  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) *~~J1.ja>  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Dm%Q96*VAq  
#if _MSC_VER > 1000 Es- =0gpK  
#pragma once vmv6y*qU  
#endif // _MSC_VER > 1000 0 . UN  
baBPf{<  
class CCaptureDlg : public CDialog Q;ZV`D/FA  
{ 2Lytk OMf  
 // Construction <isU D6TC  
 public: ._]*Y`5)d  
  BOOL bTray; .F'Cb)Z  
  BOOL bRegistered; Aj]/A  
  BOOL RegisterHotkey(); Lf:#koaC  
  UCHAR cKey; 1,:QrhC  
  UCHAR cMask; ,k1ns?i9KH  
  void DeleteIcon(); p-m\0tQ  
  void AddIcon(); iMv):1p>8  
  UINT nCount; <00nu'Ex1v  
  void SaveBmp(); \x<,Ma=D  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor QL @SE@"  
  // Dialog Data &lID6{79Z  
  //{{AFX_DATA(CCaptureDlg) Em4'b1mDX%  
  enum { IDD = IDD_CAPTURE_DIALOG }; H ?eG5  
  CComboBox m_Key; 2c51kG77E  
  BOOL m_bControl; DxD\o+:r  
  BOOL m_bAlt; # F6<N]i  
  BOOL m_bShift; :L6%57  
  CString m_Path; (0l>P]"n   
  CString m_Number; d}  5  
  //}}AFX_DATA S(Z\h_m(  
  // ClassWizard generated virtual function overrides WL|71?@C  
  //{{AFX_VIRTUAL(CCaptureDlg) :`K2?;DC8  
 public: NiEz3ODSi  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Xq_h C"s  
 protected: ([|^3tM  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~;-2eKw  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0eKLp8;Lh  
  //}}AFX_VIRTUAL @NiLKcL#  
  // Implementation \Unawv~  
 protected: 8QMMKO ui\  
  HICON m_hIcon; <Qr*!-Kc6  
  // Generated message map functions elR1NhB|p  
  //{{AFX_MSG(CCaptureDlg) -]-0]*oAp  
  virtual BOOL OnInitDialog(); t<"`gM^|  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); m;nH v  
  afx_msg void OnPaint(); 9ei<ou_s  
  afx_msg HCURSOR OnQueryDragIcon(); [VLq/lg*  
  virtual void OnCancel(); I %sw(uoE  
  afx_msg void OnAbout(); fLeHn,*,"  
  afx_msg void OnBrowse(); q,_E HPc  
  afx_msg void OnChange(); N?8nlrDQ  
 //}}AFX_MSG bl^pMt1fv  
 DECLARE_MESSAGE_MAP() iaQfxQP1w%  
}; EiP N44(  
#endif ]T(qk  
oCLM'\  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file E:O/=cT  
#include "stdafx.h" e\O625  
#include "Capture.h" ADM!4L(s4}  
#include "CaptureDlg.h" P8H2v_)X&  
#include <windowsx.h> SmRFxqtN  
#pragma comment(lib,"hook.lib") B qINU  
#ifdef _DEBUG w11L@t[5W8  
#define new DEBUG_NEW O>I%O^  
#undef THIS_FILE +3M1^:  
static char THIS_FILE[] = __FILE__; ?v-!`J>EF#  
#endif 1FG"Ak}D  
#define IDM_SHELL WM_USER+1 @\:@_}Z`_}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); PN= 5ICT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c,]fw2  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s0CDp"uJY  
class CAboutDlg : public CDialog Z%b1B<u$  
{ s'd\"WaQV  
 public: 6;@:/kl t  
  CAboutDlg(); YE:5'@Z  
  // Dialog Data J0YNzC4  
  //{{AFX_DATA(CAboutDlg) JaR!9GVN7  
  enum { IDD = IDD_ABOUTBOX }; "rc QS H  
  //}}AFX_DATA ,&s"f4Mft  
  // ClassWizard generated virtual function overrides RQu[FZT,  
  //{{AFX_VIRTUAL(CAboutDlg) 0'Qvis[kt  
 protected: dtj b(*x  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 82V;J 8T?  
  //}}AFX_VIRTUAL -O r\  
  // Implementation !HtW~8|:  
 protected: oA:`=f%\  
  //{{AFX_MSG(CAboutDlg) . Y$xNLoP[  
  //}}AFX_MSG =EH/~NGk  
  DECLARE_MESSAGE_MAP() a[,p1}!_  
}; i7rk%q  
n<@C'\j@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) #Uep|A  
{ 1(_[awBx  
 //{{AFX_DATA_INIT(CAboutDlg) {iCX?Sb  
 //}}AFX_DATA_INIT sk_xQo#Y 3  
} gxJ12' m  
h`eHoKJ#w  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) W6r3v)~  
{ b\kA  
 CDialog::DoDataExchange(pDX); kIe)ocJg  
 //{{AFX_DATA_MAP(CAboutDlg) -G#m'W&  
 //}}AFX_DATA_MAP Eg2SC?5  
} {lUaN0O:  
bYX.4(R  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) <u1`o`|-  
 //{{AFX_MSG_MAP(CAboutDlg) ]3 Ibl^J  
 // No message handlers t0?t Xe.B  
 //}}AFX_MSG_MAP E70o nR!i  
END_MESSAGE_MAP() RE-y5.kE^  
K|Xe)  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -s7!:MB%g  
: CDialog(CCaptureDlg::IDD, pParent) h0A%KL  
{ &" 5Yt&{  
 //{{AFX_DATA_INIT(CCaptureDlg) 91nB?8ZE6,  
  m_bControl = FALSE; yn20*ix{  
  m_bAlt = FALSE; *y` (^kyS  
  m_bShift = FALSE; cxFyN ;7  
  m_Path = _T("c:\\"); 6\v4#  
  m_Number = _T("0 picture captured."); rJB/)4 mE  
  nCount=0; 2z AxGX  
  bRegistered=FALSE; ;!7M<T$&  
  bTray=FALSE; I]pz3!On4,  
 //}}AFX_DATA_INIT |Ho} D~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 fQ -IM/z  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *+00  
} oMYZ^b^  
ixoN#'y<"  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7{k?" NF  
{ SL\15`[{  
 CDialog::DoDataExchange(pDX); fP8bWZ{  
 //{{AFX_DATA_MAP(CCaptureDlg) C*1 1?B[  
  DDX_Control(pDX, IDC_KEY, m_Key); '$ z@40u  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); i[z#5;x+<  
  DDX_Check(pDX, IDC_ALT, m_bAlt); U'Y,T$Q  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ttt4h  
  DDX_Text(pDX, IDC_PATH, m_Path); !9.\A:G  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "5Z5x%3I  
 //}}AFX_DATA_MAP fEt BodA)  
} o3NB3@uj<  
 `=B v+  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) mtw{7 E  
//{{AFX_MSG_MAP(CCaptureDlg) IJ:JH=8  
 ON_WM_SYSCOMMAND() V@EyU/VJ  
 ON_WM_PAINT() 5yj6MaqJ  
 ON_WM_QUERYDRAGICON() 2E!Q5 l!j  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) *Uf>Xr&  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) hM=X# ;  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ER}5`*X{  
//}}AFX_MSG_MAP %WX^']p  
END_MESSAGE_MAP() 9C!b f \  
<^942y-=  
BOOL CCaptureDlg::OnInitDialog() 9T1 - {s R  
{ V?jWp$  
 CDialog::OnInitDialog(); #/_ VY.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); =+[` 9  
 ASSERT(IDM_ABOUTBOX < 0xF000); F[)tg#}@G  
 CMenu* pSysMenu = GetSystemMenu(FALSE); "5EL+z3v  
 if (pSysMenu != NULL) ivt ~ S  
 { v_pFI8Cz)  
  CString strAboutMenu; ",Fvv  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Sogt?]HB$  
  if (!strAboutMenu.IsEmpty()) vTWm_ed+^  
  { 8.7lc2aX  
   pSysMenu->AppendMenu(MF_SEPARATOR); 5aXE^.`  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~\<L74BB  
  } LW9F%?e!>  
 } &]A0=h2{P*  
 SetIcon(m_hIcon, TRUE); // Set big icon qagR?)N)u  
 SetIcon(m_hIcon, FALSE); // Set small icon ]mC5Z6,1s  
 m_Key.SetCurSel(0); WZP1g kX&M  
 RegisterHotkey(); b?, =|H  
 CMenu* pMenu=GetSystemMenu(FALSE); KYl!Iw67d  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); x0%@u^BF  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); xX Dj4j,  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 0h{&k7T<7  
 return TRUE; // return TRUE unless you set the focus to a control GNHWbC6_m  
} |8)\8b|VuC  
IP)%y%ycw  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) {K:] dO  
{ 2 i NZz  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (rq(y$N  
 { "{2niBx  
  CAboutDlg dlgAbout; 6* 0vUy*"  
  dlgAbout.DoModal(); >Nx4 +|  
 } "3_GFq  
 else [| N73m,&  
 { !\^W*nQ>l  
  CDialog::OnSysCommand(nID, lParam); oR3t vw.  
 } ft4hzmuzM  
} /bo`@ !-#  
g8" H{u  
void CCaptureDlg::OnPaint() n?9FJOqi  
{ C 5e;U  
 if (IsIconic()) M 5`hMfg  
 { Oq)7XL4  
  CPaintDC dc(this); // device context for painting C\^,+)Y\~  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WSGho(\  
  // Center icon in client rectangle k<NxI\s8]  
  int cxIcon = GetSystemMetrics(SM_CXICON); .S4%Q9l  
  int cyIcon = GetSystemMetrics(SM_CYICON); GLMpWD`Wo  
  CRect rect; 2h)Qz+|7  
  GetClientRect(&rect); }KEr@h,N  
  int x = (rect.Width() - cxIcon + 1) / 2; (Ap?ixrR_  
  int y = (rect.Height() - cyIcon + 1) / 2; )#`&[9d-  
  // Draw the icon bU/YU0ZIT  
  dc.DrawIcon(x, y, m_hIcon); ;krIuk-  
 } h R6Pj"@0  
 else &VG  
 { <|w(Sn  
  CDialog::OnPaint(); d"Zyc(Jk  
 } }d5~w[  
} Z'|k M!  
dfZ`M^NU  
HCURSOR CCaptureDlg::OnQueryDragIcon() s .+`"rK  
{ v I,T1%llu  
 return (HCURSOR) m_hIcon; Wr'1Y7z  
} tZu1jBO_Q4  
i)$<j!L  
void CCaptureDlg::OnCancel() Wv ~&Qh}  
{ W! J@30  
 if(bTray) 7<Y aw,G  
  DeleteIcon(); =F %lx[9Ye  
  CDialog::OnCancel(); rd)W+W9  
} u1\r:q  
*M$'dLn  
void CCaptureDlg::OnAbout() O{Z${TC[  
{ ;82?ACCP  
 CAboutDlg dlg; ,zxv>8Nt  
 dlg.DoModal(); mU.c!|Y  
} P4+PY 8  
b/ h#{'  
void CCaptureDlg::OnBrowse() ,,BWWFg~  
{ w6pXF5ur>  
 CString str; 3e1P!^'\  
 BROWSEINFO bi; w"? RbA  
 char name[MAX_PATH]; : LT'#Q8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); TO G:N~  
 bi.hwndOwner=GetSafeHwnd(); ;mPX8bT  
 bi.pszDisplayName=name; nlaW$b{=  
 bi.lpszTitle="Select folder"; P]armg%  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; t+{vb S0  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); aM(x--UR=  
 if(idl==NULL) DKkilqVM  
  return; :T<5Tq*+x  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h Vui.]  
 str.ReleaseBuffer(); !(Y,2{  
 m_Path=str; G.PRPl  
 if(str.GetAt(str.GetLength()-1)!='\\') 'K#ndCGJ$  
  m_Path+="\\"; :\y' ?d- Q  
 UpdateData(FALSE); JV_VM{w{K  
} f[ia0w5 m  
4yjIR?  
void CCaptureDlg::SaveBmp() \k^ojzJ  
{ |"+Uf w^  
 CDC dc; `3@?)xa  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); l,zhBnD  
 CBitmap bm; h[Uo6`  
 int Width=GetSystemMetrics(SM_CXSCREEN); <1 ;pyw y  
 int Height=GetSystemMetrics(SM_CYSCREEN); *N"CV={No  
 bm.CreateCompatibleBitmap(&dc,Width,Height); n=|% H'U  
 CDC tdc; C7DwA/$D  
 tdc.CreateCompatibleDC(&dc); <XN=v!2;  
 CBitmap*pOld=tdc.SelectObject(&bm); NCl@C$W9q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); d`~~Ww1  
 tdc.SelectObject(pOld); -:OJX#j  
 BITMAP btm; FZLx.3k4  
 bm.GetBitmap(&btm); c] t@3m  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; h_SkX@"/-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  Lw%_xRn)  
 BITMAPINFOHEADER bih; [^^Pl:+  
 bih.biBitCount=btm.bmBitsPixel; vu#ZLq  
 bih.biClrImportant=0; +w"?q'SnF  
 bih.biClrUsed=0; oYt 34@{?  
 bih.biCompression=0; mrr~#Bb>  
 bih.biHeight=btm.bmHeight; 1vtC4`  
 bih.biPlanes=1; 8m=O408Q  
 bih.biSize=sizeof(BITMAPINFOHEADER); OmS8cSYGc  
 bih.biSizeImage=size; ncUS8z  
 bih.biWidth=btm.bmWidth; NRgVNE  
 bih.biXPelsPerMeter=0; NFKvgd@  
 bih.biYPelsPerMeter=0; ;47z.i&T  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); sx}S,aIU  
 static int filecount=0; !&NrbiuN  
 CString name; `uH7~ r^  
 name.Format("pict%04d.bmp",filecount++); O;|Cu7WU  
 name=m_Path+name; kX8NRPW  
 BITMAPFILEHEADER bfh; iq[IZdza  
 bfh.bfReserved1=bfh.bfReserved2=0; xc\zRsY`  
 bfh.bfType=((WORD)('M'<< 8)|'B'); OA(.&5]  
 bfh.bfSize=54+size; F\L!.B  
 bfh.bfOffBits=54; D /GE-lq  
 CFile bf; RBBmGZ  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Z!7xRy  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8/&4l,M5  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 51y#A Q@  
  bf.WriteHuge(lpData,size); _A] )q  
  bf.Close(); ic"8'Rwb  
  nCount++; tC5-^5[y  
 } I~&9c/&  
 GlobalFreePtr(lpData); .{} 8mFi1  
 if(nCount==1) qZ&~&f|>e  
  m_Number.Format("%d picture captured.",nCount); v^vi *c  
 else 4d-(:  
  m_Number.Format("%d pictures captured.",nCount); egURRC!  
  UpdateData(FALSE); +jyGRSo  
} y@I t#!u0  
o]<9wc:FZ  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) a^pbBDi W  
{ Jazgn5  
 if(pMsg -> message == WM_KEYDOWN) A.dbb'^  
 { 'W yWO^Bdk  
  if(pMsg -> wParam == VK_ESCAPE) akU2ToP  
   return TRUE; 4^M"V5tDx  
  if(pMsg -> wParam == VK_RETURN) :O$bsw:3w<  
   return TRUE; OZnKJ<  
 } ^YropzHZ4E  
 return CDialog::PreTranslateMessage(pMsg); &i.sSqSI5  
} 7GWOJ^)  
7CvBE;i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TEMxjowr  
{ I.GoY[u_%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ x5mg<y2`Ng  
  SaveBmp(); nw0#gDI|  
  return FALSE; /of K7/  
} 2J8:_Ql3I  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ u+KZ. n/  
 CMenu pop; J9p4\=9  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H;l_;c`  
 CMenu*pMenu=pop.GetSubMenu(0); -Ou.C7ol  
 pMenu->SetDefaultItem(ID_EXITICON); r$}C<a[U  
 CPoint pt; m!ueqV"  
 GetCursorPos(&pt); upL3M`  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I "~.p='  
 if(id==ID_EXITICON) G3%Ju=  
  DeleteIcon(); _]pu"hZz4  
 else if(id==ID_EXIT) P(TBFu  
  OnCancel(); XclTyUGoK+  
 return FALSE; ;}"Eqq:  
} zdd-n[%@V  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ,^97Ks ;  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0FgF,  
 AddIcon(); ;%B9mM#p~  
 return res; V?1 $H  
}  1/2cb-V  
,<r&] eC  
void CCaptureDlg::AddIcon() UNff &E-  
{ |=m.eU  
 NOTIFYICONDATA data; 9S*"={}%  
 data.cbSize=sizeof(NOTIFYICONDATA); _gI1rXI  
 CString tip; C5,fX-2Q  
 tip.LoadString(IDS_ICONTIP); \ '4~@  
 data.hIcon=GetIcon(0); bAGKi.  
 data.hWnd=GetSafeHwnd(); G9 O6Fi  
 strcpy(data.szTip,tip); ow.!4kx{d  
 data.uCallbackMessage=IDM_SHELL; wz*iwd-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (Y@T5-!D  
 data.uID=98; $?G@ijk,  
 Shell_NotifyIcon(NIM_ADD,&data); |f#hGk6  
 ShowWindow(SW_HIDE); pX?3inQP%(  
 bTray=TRUE; v/.'st2%  
} f,KB BBbG  
cN8Fn4gq  
void CCaptureDlg::DeleteIcon() 'in%Gii  
{ v#d\YV{I  
 NOTIFYICONDATA data; %gh#gH   
 data.cbSize=sizeof(NOTIFYICONDATA); N}K [Q=  
 data.hWnd=GetSafeHwnd(); ?YLq iAA  
 data.uID=98; D5D *$IC  
 Shell_NotifyIcon(NIM_DELETE,&data); _y_}/  
 ShowWindow(SW_SHOW); wG3b{0  
 SetForegroundWindow(); =abcLrf2G  
 ShowWindow(SW_SHOWNORMAL); yXJ25Axb  
 bTray=FALSE; DfD >hf/  
} 2!Dz9m3  
E,}{iqAb  
void CCaptureDlg::OnChange() 7|DG1p9C  
{ . : Wf>:  
 RegisterHotkey(); j)?M  
} ehr-o7](  
{E:`  
BOOL CCaptureDlg::RegisterHotkey() gM\>{ihM'  
{ pOc2V  
 UpdateData(); SG&,o =I$  
 UCHAR mask=0; ir_XU/ve  
 UCHAR key=0; a (~Y:v  
 if(m_bControl) q[,p#uJ]  
  mask|=4; 6*q1%rs:w  
 if(m_bAlt) FklR!*oL,)  
  mask|=2; fY[Fwjj3  
 if(m_bShift) 1^![8>u"  
  mask|=1; "w'pIUQ3,  
  key=Key_Table[m_Key.GetCurSel()]; ,PTM'O@aU#  
 if(bRegistered){ * 9^8NY]  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ahg:mlaob  
  bRegistered=FALSE; 6]?mjG6  
 } 3' i6<  
 cMask=mask; E1eGZ&&Gd  
 cKey=key; CO='[1"_5  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); sFTAE1|  
 return bRegistered; tQ|c.`)W  
} olE(#}7V  
u ]e-IYH  
  四、小结 OlOOg  
i/x |c!E  
  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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