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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: rsa&Oo D>  
  .]Mn^2#j  
  一、实现方法 u1K\@jlw  
p2x [p  
  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: ^+?|Qfi  
"Mmf6hu  
#pragma data_seg("shareddata") OuIv e>8  
HHOOK hHook =NULL; //钩子句柄 K X]oE+:  
UINT nHookCount =0; //挂接的程序数目 oQ+61!5>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 f"&Xr!b.h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 `0#H]=$2h  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey N<z`yV  
static int KeyCount =0; kpob b  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 [6(Iwz?  
#pragma data_seg() @{Py%  
JhR W[~  
  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。 $M"0BZQ?y!  
Sav`%0q?7a  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: G5]1s  
8V4V3^_xs  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ; 7G_f  
cKey,UCHAR cMask) -.vDF?@G  
{ m$y]Lf  
 BOOL bAdded=FALSE; &:?e&  
 for(int index=0;index<MAX_KEY;index++){ n+2J Dq|?p  
  if(hCallWnd[index]==0){ 6*1$8G`$8,  
   hCallWnd[index]=hWnd; w.kCBDL  
   HotKey[index]=cKey; 2f:Mm'XdB  
   HotKeyMask[index]=cMask; )wf\F6jN  
   bAdded=TRUE; ;MTz]c  
   KeyCount++; wFlV=!>,  
   break; dU;upS_-  
  } H)JS0 G0  
 } E;-qP)yU  
 return bAdded; w;`m- 9<Y  
} hH+bt!aH  
//删除热键 I 8Y*@$h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <lFY7' aY  
{ dhR(_  
 BOOL bRemoved=FALSE; Z}cIA87U  
 for(int index=0;index<MAX_KEY;index++){ rH}fLu8,;Q  
  if(hCallWnd[index]==hWnd){ MguL$W&l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ rpU/s@%L  
    hCallWnd[index]=NULL; z<a2cQ?XQ  
    HotKey[index]=0; - 0~IY  
    HotKeyMask[index]=0; N <pbO#e  
    bRemoved=TRUE; lpEDPvD_Vm  
    KeyCount--; P79R~m`  
    break; ]O@"\_}  
   } \5[-Ml  
  } <NQyP{p  
 }  ?f2G?Y  
 return bRemoved; cCng5Nq,c  
} lYQtv=q  
+J40wFI:y  
:Ee?K  
  DLL中的钩子函数如下: r>3^kL5UI  
{,V$*  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) iK x+6v  
{ vw r RZ"2  
 BOOL bProcessed=FALSE; Gc5VQ^]  
 if(HC_ACTION==nCode) uZ[/%GTX{)  
 { 6D*chvNA;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 +L6" vkz  
   switch(wParam) UA0tFeH  
   {  |9]PtgQv7  
    case VK_MENU: ]GS ~i+=M  
     MaskBits&=~ALTBIT; ^uBwj }6  
     break; Qu_EfmN|  
    case VK_CONTROL: ?cBO6^  
     MaskBits&=~CTRLBIT; F^sw0 .b  
     break; P7>IZ >bw  
    case VK_SHIFT: 4I.1D2 1jA  
     MaskBits&=~SHIFTBIT; T:#S86m  
     break; 6<76O~hNZ  
    default: //judge the key and send message z+6QZQk  
     break; 5vGioO  
   } :C}Hy  
   for(int index=0;index<MAX_KEY;index++){ nhT;b,G.Z  
    if(hCallWnd[index]==NULL) o>K &D$J;O  
     continue; C*j9Iaj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) HwW6tQ  
    { GXEcpc08  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); f#mx:Q.7I  
     bProcessed=TRUE; }MjQP R  
    } )[ w&C_>]  
   } r:#Q9EA  
  } . z].:$J&  
  else if((lParam&0xc000ffff)==1){ //有键按下 |<2 *v-a  
   switch(wParam) |Pf(J;'[  
   { /.2u.G  
    case VK_MENU: Z*h ;e;  
     MaskBits|=ALTBIT; y*(_\\  
     break; xtsL8-u f  
    case VK_CONTROL: ?+Hp?i$1  
     MaskBits|=CTRLBIT; Za9$Hh/X  
     break; U%n,XOJ  
    case VK_SHIFT: |I/,F;'  
     MaskBits|=SHIFTBIT; ;fkSrdj  
     break; a.CF9m5]c  
    default: //judge the key and send message # hZQ>zcF  
     break; qlEFJ5;  
   } >.LgsMRIKi  
   for(int index=0;index<MAX_KEY;index++){ ,y%ziay  
    if(hCallWnd[index]==NULL) hLSTSD}  
     continue; u'=(&><  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) P!9;} &  
    { KZW'O b>[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 8T<@ @6`T  
     bProcessed=TRUE; y]<#%Fh  
    } /'mrDb_ip  
   } :TlAL# s&  
  } HIsB|  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 [jy0@Q9  
   for(int index=0;index<MAX_KEY;index++){ zw,-.fmM#  
    if(hCallWnd[index]==NULL) /Ht/F)&P  
     continue; "I@v&(Am;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) xl3zy~;M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q;ZLaX\bFl  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 >6IXuq  
   } .<HC[ls  
  } T0YDfo  
 } UKOFT6|  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); K]ca4Z  
} M5F(<,n;  
,%[LwmET  
  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: @W#fui<<}Y  
|.Em_*VG  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wKGo gf[(%  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IX"ZS  
(1rJFl!  
  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: G l_\Vy  
Q js2hj-$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IKGTsA;  
{ D DQs42[  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) OI*ZVD)J  
 { \QliHm!  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7Pwg+|  
  SaveBmp(); l<W*/}3  
  return FALSE; .N/GfR`0/<  
 } ax4*xxU  
 …… //其它处理及默认处理 U@#?T  
} 7AI3|Ts]p  
Ir!2^:]!  
P87ld._  
  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。 &S<? 07Z  
y!SF/i?Py  
  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。 =Na/3\^WP  
V_Xy2<V  
  二、编程步骤 kNRyOUy  
Z "-ntx#  
  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"; ('T4Db  
PP!l  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ^I@ey*$  
$[j-C9W  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; Yr5iZ~V$  
+d@v AxP  
  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; Hr /W6C  
{-o7w0d_  
  5、 添加代码,编译运行程序。 TG4\%S$w  
m &9)'o  
三、程序代码 MhHr*!N"}  
/z/hUa  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL A * a{  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) tceIA8d6  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6lN?)<uQ  
#if _MSC_VER > 1000 l{nB.m2  
#pragma once ^Yf3"D?&  
#endif // _MSC_VER > 1000 #D/$6ah~m  
#ifndef __AFXWIN_H__ -zPm{a  
#error include 'stdafx.h' before including this file for PCH g!p+rq_f  
#endif Tq9,c#}&  
#include "resource.h" // main symbols ^:qpa5^"  
class CHookApp : public CWinApp : [A?A4l  
{ Tf9&,!>V  
 public: PXOrOK  
  CHookApp(); M7`UoTc+>d  
  // Overrides dD[v=Z_  
  // ClassWizard generated virtual function overrides uOyLC<I/  
  //{{AFX_VIRTUAL(CHookApp) K{, W_ ^  
 public: /Lq;w'|I  
  virtual BOOL InitInstance(); }W- K  
  virtual int ExitInstance(); Z|]l"W*w  
  //}}AFX_VIRTUAL [P.@1mV  
  //{{AFX_MSG(CHookApp) r$b:1C~  
  // NOTE - the ClassWizard will add and remove member functions here. z2rQ$O -#  
  // DO NOT EDIT what you see in these blocks of generated code ! z zulVj*  
  //}}AFX_MSG :`{9x%o;  
  DECLARE_MESSAGE_MAP() B=Xnv*e  
}; N5:D8oWWXR  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #B}BI8o (  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^?H\*N4  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1h#w"4  
BOOL InitHotkey(); ],BJ}~v,X  
BOOL UnInit(); #gxRTx  
#endif o%kSR ]V|  
/AK*aRU^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. u+%)JhIp  
#include "stdafx.h" 2N6Pa(6  
#include "hook.h" x(C]O,  
#include <windowsx.h> ]3gYuz|  
#ifdef _DEBUG nG&w0de<>  
#define new DEBUG_NEW X;K8,A7`  
#undef THIS_FILE R*JOiVAC  
static char THIS_FILE[] = __FILE__; 2jI4V;H8g  
#endif /ChJ~g"  
#define MAX_KEY 100 OlD7-c2L]  
#define CTRLBIT 0x04 eLHa9R{)B  
#define ALTBIT 0x02 wZ (uq?3S`  
#define SHIFTBIT 0x01 9b{g+lMZo  
#pragma data_seg("shareddata") #J%h!#3g  
HHOOK hHook =NULL; `~w%Jf  
UINT nHookCount =0; cHqvkN`  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \GjXsR*b5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT rwi2kk#@P  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey #Pe\Z/  
static int KeyCount =0; ? RrC~7~  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift kMwIuy  
#pragma data_seg() ^L*VW gi9  
HINSTANCE hins; 1A,4 Aw<  
void VerifyWindow(); -9tXv+v?  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) SdEb[  
//{{AFX_MSG_MAP(CHookApp) A-AN6.  
// NOTE - the ClassWizard will add and remove mapping macros here. 1s^$oi}  
// DO NOT EDIT what you see in these blocks of generated code! x|~D(zo  
//}}AFX_MSG_MAP EkfGw/WDw  
END_MESSAGE_MAP() a$ +e8>  
;X9MA=b  
CHookApp::CHookApp() O"2wV +9  
{  N#2nH1C  
 // TODO: add construction code here, e+]YCp[(  
 // Place all significant initialization in InitInstance "6[Ax{cM  
} d-A%ZAkE]  
OTy 4"%  
CHookApp theApp; h!JjN$  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y/:Q|HnXQ  
{ _If@#WnoyA  
 BOOL bProcessed=FALSE; nvUkbmZG#  
 if(HC_ACTION==nCode) %r}KvJgd  
 { S+e-b'++?  
  if((lParam&0xc0000000)==0xc0000000){// Key up '%JMnU  
   switch(wParam) lHj7O &+  
   { BT*K,p  
    case VK_MENU: hQW#a]]V:  
     MaskBits&=~ALTBIT; HzO0K=Z=R0  
     break; -mWw.SfEZ  
    case VK_CONTROL: K{[Fa,]'  
     MaskBits&=~CTRLBIT; SqT"/e]b'  
     break; 'Rar>oU  
    case VK_SHIFT: 01SFOPuR%(  
     MaskBits&=~SHIFTBIT; #L1yL<'  
     break; 0,i+  
    default: //judge the key and send message 7UEy L }N  
     break; iM-hWhU  
   } >f9]Nj  
   for(int index=0;index<MAX_KEY;index++){ G){1`gAhNJ  
    if(hCallWnd[index]==NULL) d+$[EDix  
     continue; 5xn0U5U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) qz_TcU'  
    { Q:xI} ]FM  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); f*R_\  
     bProcessed=TRUE; ^!s}2GcS`  
    } 4VL!U?dk  
   } a1Y_0  
  } <3]/ms  
  else if((lParam&0xc000ffff)==1){ //Key down *dn-,Q%`  
   switch(wParam) )F9%^a(  
   { !z&seG]@  
    case VK_MENU: f~(^|~ZT  
     MaskBits|=ALTBIT; 0aq-drl5\  
     break; mm9S#Ya  
    case VK_CONTROL: (^OC%pc  
     MaskBits|=CTRLBIT; '5+, lRu  
     break; q~A|R   
    case VK_SHIFT: 0z2R`=)  
     MaskBits|=SHIFTBIT; u+i/CE#w  
     break; Yv`1ySR  
    default: //judge the key and send message 9?mOLDu}Q0  
     break; $EHn ;~w T  
   } '&L   
   for(int index=0;index<MAX_KEY;index++) j2&OYg  
   { /U Rj$ |  
    if(hCallWnd[index]==NULL) ovRCF(Og,  
     continue; ?9.?w-Q'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *{n,4d\..  
    { u*YuU%H=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Y(;[L`"  
     bProcessed=TRUE; %L,,  
    } tYxlM!  
   } a*ixs'MJ  
  } U},W/g-  
  if(!bProcessed){ Iw-6Z+ 94  
   for(int index=0;index<MAX_KEY;index++){ &[\arwe)  
    if(hCallWnd[index]==NULL) dL Py%q  
     continue; kJ:5msKwC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :zk.^q  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O9 r44ww  
   } J'&? =|  
  } m`w6wz  
 } /?<9,7#i  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); iO#xIl<  
} Czl 8Q oH  
)9P  
BOOL InitHotkey() 9#ay(g  
{ @!tmUme1c  
 if(hHook!=NULL){ ,wy:RVv@e  
  nHookCount++; w@D@,q'x  
  return TRUE; :=KGQ3V~eK  
 } FP cvkXQD  
 else 2yg'?tpj  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]7ZC>.t  
  if(hHook!=NULL) .oOt(K +  
   nHookCount++; _-nN( ${{  
  return (hHook!=NULL); nFOG=>c}  
} m<;" 1<k  
BOOL UnInit() LA(JA  
{ x~I1(l7r  
 if(nHookCount>1){ '<j p.sZQ  
  nHookCount--; -CNv=vj 3  
  return TRUE; Hqy>!1 !  
 } &~6O;}\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); l`G:@}P>G  
 if(unhooked==TRUE){ gM:oP.  
  nHookCount=0;  y3$\ m  
  hHook=NULL; %Y[/Ucdm  
 } lY8Qy2k|  
 return unhooked; eHZl-|-  
} x=<>%m5R  
",oUVl  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 3m9 E2R,  
{ biuo.OG]  
 BOOL bAdded=FALSE; h*'5h!  
 for(int index=0;index<MAX_KEY;index++){ |iThgq_\z  
  if(hCallWnd[index]==0){ Y\F H4}\S  
   hCallWnd[index]=hWnd; ?-p aM5Q+  
   HotKey[index]=cKey; ))zaL2UP.  
   HotKeyMask[index]=cMask; 745PCC'FK  
   bAdded=TRUE; ,S K6*tpI  
   KeyCount++; 6@36 1f[  
   break; e=$xn3)McY  
  } h(K4AiGE  
 } D($UbT-v  
 return bAdded; 6 6;O3g'  
} M& L0n%,y5  
`{[C4]Ew/  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -B! TA0=oJ  
{ dXN&<Q,  
 BOOL bRemoved=FALSE; ;0{*V5A  
 for(int index=0;index<MAX_KEY;index++){ oMf h|B  
  if(hCallWnd[index]==hWnd){ JH, +F  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @AyW9!vV;3  
    hCallWnd[index]=NULL; V,,iKr@TG  
    HotKey[index]=0; Jk{2!uP  
    HotKeyMask[index]=0; 'v5gg2  
    bRemoved=TRUE; S'fq/`2g6  
    KeyCount--; {[iQRYD0|  
    break; !7|9r$  
   } P_%l}%   
  } g#NUo/  
 } T!$HVHh&,}  
 return bRemoved; $^GnY7$!>  
} WJ,ON-v  
9&jNdB  
void VerifyWindow() gW%(_H mX  
{ o?\Pw9Y  
 for(int i=0;i<MAX_KEY;i++){ fQ) ;+  
  if(hCallWnd!=NULL){ cE?J]5#^  
   if(!IsWindow(hCallWnd)){ fR{7780WZ  
    hCallWnd=NULL; epe}^Pl  
    HotKey=0; oZw#Nd   
    HotKeyMask=0; yIP IA%dJ  
    KeyCount--; %oQj^r!Xd  
   } m#P&Yd4T  
  } :a`m9s 4  
 } }3e+D  
} R'U(]&e.j  
4Yk (ldR~  
BOOL CHookApp::InitInstance() *8+YR  
{ wVX0!y6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h<q``hn>  
 hins=AfxGetInstanceHandle(); AG%aH=TKp  
 InitHotkey();  }2"k:-g  
 return CWinApp::InitInstance(); l1-FL-1  
} ggWfk  
r 6<}S(  
int CHookApp::ExitInstance() m5*RB1  
{ A5\S0l$Q  
 VerifyWindow(); GW#Wy=(_  
 UnInit(); X+ jSB,  
 return CWinApp::ExitInstance(); :}-[%LSV  
} [)?3Dp|MH  
"a7d`l:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 4B 6Aw?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ce\-oT  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ &,xM;8b  
#if _MSC_VER > 1000 Ek6W:Q:@  
#pragma once Dc2eY.  
#endif // _MSC_VER > 1000 oB@C-(M  
{,ljIhc,  
class CCaptureDlg : public CDialog jXQ_7  
{ u""= 9>0  
 // Construction 0v?,:]A0E  
 public: "-oC,;yq  
  BOOL bTray; 7+bzCDKU  
  BOOL bRegistered; dLq!t@?iu>  
  BOOL RegisterHotkey(); OWzIea@  
  UCHAR cKey; OZD/t(4?6s  
  UCHAR cMask; J^T66}r[f,  
  void DeleteIcon(); kaLRI|hC  
  void AddIcon(); Y|L57F  
  UINT nCount; YDwns  
  void SaveBmp(); ~cz t=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Nx"?'-3Hm  
  // Dialog Data 4$rO,W/&0  
  //{{AFX_DATA(CCaptureDlg) 'n=D$j]X  
  enum { IDD = IDD_CAPTURE_DIALOG }; '1+ Bgf  
  CComboBox m_Key; l;ugrAo?  
  BOOL m_bControl; >JhQ=j  
  BOOL m_bAlt; OR O~(%-(e  
  BOOL m_bShift; N Jf''e3  
  CString m_Path; IM+PjYJ  
  CString m_Number; N'StT$(  
  //}}AFX_DATA 6=FuH@Q&  
  // ClassWizard generated virtual function overrides h?b{{  
  //{{AFX_VIRTUAL(CCaptureDlg) ,3K?=e2  
 public: u|C9[(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); MD,-<X)Qy  
 protected: ]KmYPrCl0  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support DbDpdC;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); z{ 8!3>:E  
  //}}AFX_VIRTUAL Ni`qU(I'|  
  // Implementation `'/8ifKz  
 protected: b#F3,T__`Y  
  HICON m_hIcon; VC@o]t5  
  // Generated message map functions @AwH?7(b  
  //{{AFX_MSG(CCaptureDlg) AQ&;y&+QR  
  virtual BOOL OnInitDialog(); t9kgACo/M  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); E4{8 $:q=  
  afx_msg void OnPaint(); 'oTF$3n  
  afx_msg HCURSOR OnQueryDragIcon(); V\_ &2',t  
  virtual void OnCancel(); m{g{"=}YR  
  afx_msg void OnAbout(); SFjN 5u  
  afx_msg void OnBrowse(); W<2-Q,>Y  
  afx_msg void OnChange(); \<5xf<{  
 //}}AFX_MSG 8L#sg^1V  
 DECLARE_MESSAGE_MAP() +$%o#~  
}; w/&#UsEIr  
#endif )9*WmFc+#  
}*%%GPJ  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^^v!..V]J  
#include "stdafx.h" \Tc$P#  
#include "Capture.h" *+ 7#z;  
#include "CaptureDlg.h" /q=<OEC  
#include <windowsx.h> M*x_1h5n  
#pragma comment(lib,"hook.lib") y,aASy!Q  
#ifdef _DEBUG j8lbn|.  
#define new DEBUG_NEW }} IvZG&  
#undef THIS_FILE {AZW."?  
static char THIS_FILE[] = __FILE__; fE(rDQI  
#endif j9Lc2'  
#define IDM_SHELL WM_USER+1 /as1  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qZ4DO*%b3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0j*8|{|  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &ha39&I  
class CAboutDlg : public CDialog | 2mEowAd  
{ YcIk{_N3  
 public: 6 ,!]x>B  
  CAboutDlg(); hgm`6TQ  
  // Dialog Data \=.iM?T  
  //{{AFX_DATA(CAboutDlg) =4?m>v,re  
  enum { IDD = IDD_ABOUTBOX }; GSk;~^l  
  //}}AFX_DATA $ED<:[3N  
  // ClassWizard generated virtual function overrides +Ta7b)  
  //{{AFX_VIRTUAL(CAboutDlg) ,ujoGSx}  
 protected: 4h-y'&Z  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /@0wbA  
  //}}AFX_VIRTUAL lO:[^l?F  
  // Implementation <@oK ^ja  
 protected: xC|7"N^/  
  //{{AFX_MSG(CAboutDlg) y0Ag px  
  //}}AFX_MSG f@Db._ E  
  DECLARE_MESSAGE_MAP() mp}ZHufG  
}; :=-h'<D  
zE<}_nA  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ,<%],-Lt[  
{ q K]Wk+  
 //{{AFX_DATA_INIT(CAboutDlg) hEDj"`Px  
 //}}AFX_DATA_INIT PQ1\b-I  
} a 6[bF  
#\fAp RL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) S/8xo@vct]  
{ _Nw-|N.  
 CDialog::DoDataExchange(pDX); H Jwj,SL  
 //{{AFX_DATA_MAP(CAboutDlg) R`Q9|yF\  
 //}}AFX_DATA_MAP euQ d  
} PX+$Us  
p=T]%k*^h#  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E: #VS~  
 //{{AFX_MSG_MAP(CAboutDlg) zDC-PHF HQ  
 // No message handlers o: qB#8X  
 //}}AFX_MSG_MAP w_6h $"^x  
END_MESSAGE_MAP() e)O6k7U$  
lr=*Ty(V  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {,,w5/k^  
: CDialog(CCaptureDlg::IDD, pParent) Y8(g8RN  
{ p,U.5bX  
 //{{AFX_DATA_INIT(CCaptureDlg) Drc\$<9c@  
  m_bControl = FALSE; ?NJ\l5'  
  m_bAlt = FALSE; 5ZUqCl(PX)  
  m_bShift = FALSE; ^[!LU  
  m_Path = _T("c:\\"); jrG@ +" }  
  m_Number = _T("0 picture captured."); jf@#&%AC9  
  nCount=0; qHklu2_%  
  bRegistered=FALSE; !'MZeiLP  
  bTray=FALSE; a,!c6'QE  
 //}}AFX_DATA_INIT 6*Rz}RQ  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 .pK_j~}P  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); q8`JRmt)H  
} 0OP6VZ\  
MYDAS-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LsoP >vJG  
{ EX=Q(}9F<  
 CDialog::DoDataExchange(pDX); )FYz*:f>&  
 //{{AFX_DATA_MAP(CCaptureDlg) !Hxx6/  
  DDX_Control(pDX, IDC_KEY, m_Key); v~9PS2  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); [*Wq6n  
  DDX_Check(pDX, IDC_ALT, m_bAlt); M5CFW >T  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); b1R%JY7/S  
  DDX_Text(pDX, IDC_PATH, m_Path); AKejWh  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ?=$a6o  
 //}}AFX_DATA_MAP 7jvf:#\LtL  
} KYZ/b8C  
kO+Y5z6=  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) i.C+{QH  
//{{AFX_MSG_MAP(CCaptureDlg) \IQf|  
 ON_WM_SYSCOMMAND() M1-n  
 ON_WM_PAINT() r1}YN<+,s  
 ON_WM_QUERYDRAGICON() q",n:=PL  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  km|;T!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) $_onSYWr  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g/)mbL>=  
//}}AFX_MSG_MAP 5(]=?$$*t  
END_MESSAGE_MAP() WnyEdYA  
g:7S/L0]  
BOOL CCaptureDlg::OnInitDialog() .i) H1sD  
{ BRLrD/8Le  
 CDialog::OnInitDialog(); N`h,2!(j  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %4*-BCP  
 ASSERT(IDM_ABOUTBOX < 0xF000); S-NKT(H)c  
 CMenu* pSysMenu = GetSystemMenu(FALSE); |#^wYZO1U  
 if (pSysMenu != NULL) &!SdO<agZ  
 { j'R{llZW  
  CString strAboutMenu; _0 Qp[l-  
  strAboutMenu.LoadString(IDS_ABOUTBOX); c |.~f+  
  if (!strAboutMenu.IsEmpty()) N =FX3Z  
  { ~oWCTj-  
   pSysMenu->AppendMenu(MF_SEPARATOR); [+\=x[q  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >4b:`L  
  } |qnAqzK|  
 } .76T<j_  
 SetIcon(m_hIcon, TRUE); // Set big icon _bRd2k,  
 SetIcon(m_hIcon, FALSE); // Set small icon OGpy\0%  
 m_Key.SetCurSel(0); ^lud2x$O^C  
 RegisterHotkey(); j")#"& m  
 CMenu* pMenu=GetSystemMenu(FALSE); Ta8;   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); !W4A 9Th  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 6O"?wN%$  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6[b'60CuZL  
 return TRUE; // return TRUE unless you set the focus to a control a~ sU  
} C-O~Oil  
W6%\Zwav?)  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) }tJR Bb  
{ .$&mWytw=  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) jGy%O3/  
 { cLhHGwX=x  
  CAboutDlg dlgAbout; #[Z ToE4  
  dlgAbout.DoModal(); +}1h  
 } Lu?MRF f  
 else 14>WpNN  
 { mUSrCU_}  
  CDialog::OnSysCommand(nID, lParam); PIOG| E  
 } r:;nv D  
} Jy<hTd*q  
 t~_vzG  
void CCaptureDlg::OnPaint() i82sMN1jl7  
{ JV_VF'  
 if (IsIconic()) 0i/!by {@  
 { ,'!x 9 `  
  CPaintDC dc(this); // device context for painting B}S!l>.z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \"k[y+O],4  
  // Center icon in client rectangle r:N =?X`N  
  int cxIcon = GetSystemMetrics(SM_CXICON); ^i+ d3  
  int cyIcon = GetSystemMetrics(SM_CYICON); 76 nrDE  
  CRect rect; (dvsGYT|.  
  GetClientRect(&rect); :DWvH,{+&  
  int x = (rect.Width() - cxIcon + 1) / 2; .h c-uaL  
  int y = (rect.Height() - cyIcon + 1) / 2; nUb0R~wr$G  
  // Draw the icon c+S<U*  
  dc.DrawIcon(x, y, m_hIcon); @}K|/  
 } =f~8"j  
 else qe^d6  
 { AUk-[i  
  CDialog::OnPaint(); B8Vhl:p  
 } xD.Uh}:J  
} IhR;YM[K  
KYw~(+gHv2  
HCURSOR CCaptureDlg::OnQueryDragIcon() ke\gzP/  
{ Sjb[v  
 return (HCURSOR) m_hIcon; !V.2~V[^M  
} ?58,Ja  
&JUHm_wd&S  
void CCaptureDlg::OnCancel() V8KdY=[  
{  {4]sJT  
 if(bTray) o,NTI h  
  DeleteIcon(); vM3 b\yp  
  CDialog::OnCancel(); };{Qx  
} [k~}Fe) x  
2 .p?gRO  
void CCaptureDlg::OnAbout() vQH 6CB"  
{ FH3^@@Y%  
 CAboutDlg dlg; 'v^Zterr  
 dlg.DoModal(); ioW&0?,Ym  
} Yq~$p Vgf  
Sgp1p}  
void CCaptureDlg::OnBrowse() ;6)Onwx  
{ 57|RE5]|!  
 CString str; OK] _.v}  
 BROWSEINFO bi; aw\0\'}  
 char name[MAX_PATH]; WY& [%r  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /}\Uw  
 bi.hwndOwner=GetSafeHwnd(); `*Ju0)g1  
 bi.pszDisplayName=name; D[H #W[  
 bi.lpszTitle="Select folder"; 'g5 Gdn  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /gH[|d  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); $eu-8E'  
 if(idl==NULL) 9 $&$Fe  
  return; kVRh/<s  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); mVsghDESJ)  
 str.ReleaseBuffer(); b[/uSwvi  
 m_Path=str; ^]zC~LfG  
 if(str.GetAt(str.GetLength()-1)!='\\') 1F,>siuh ,  
  m_Path+="\\"; K@<%Vc>L(  
 UpdateData(FALSE); CT0 ~  
} "3;b,<0  
9ao GptgN  
void CCaptureDlg::SaveBmp() }K.2  
{ }7HR<%< 7  
 CDC dc; 0ZAT;eaB  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); b#[EkI 0@  
 CBitmap bm; 5H^"  
 int Width=GetSystemMetrics(SM_CXSCREEN); rtn.^HF  
 int Height=GetSystemMetrics(SM_CYSCREEN); `JAM]qB"  
 bm.CreateCompatibleBitmap(&dc,Width,Height); yx\I&\i  
 CDC tdc; ozOvpi:k3%  
 tdc.CreateCompatibleDC(&dc); PRi1 `% d  
 CBitmap*pOld=tdc.SelectObject(&bm); wa%;'M&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ""W*) rR   
 tdc.SelectObject(pOld); b?]Lx.l-  
 BITMAP btm; kSUpEV+/  
 bm.GetBitmap(&btm); xH4Qv[k Q7  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; U9t-(`[j?  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0`Hr(J`F  
 BITMAPINFOHEADER bih; ;r3Xh)k;  
 bih.biBitCount=btm.bmBitsPixel; ,!>1A;~wT  
 bih.biClrImportant=0; #V-0-n,`  
 bih.biClrUsed=0; !v\ _<8  
 bih.biCompression=0; MO%kUq|pg  
 bih.biHeight=btm.bmHeight; ?}ly`Js  
 bih.biPlanes=1; P*:9u>  
 bih.biSize=sizeof(BITMAPINFOHEADER); #`o]{UfW  
 bih.biSizeImage=size; Bm$(4  
 bih.biWidth=btm.bmWidth; iOrpr,@  
 bih.biXPelsPerMeter=0; YwaWhBCIF  
 bih.biYPelsPerMeter=0; ~cH3RFV  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ,SG-{   
 static int filecount=0; J.Fy0W@+k4  
 CString name; %f1>cO9[  
 name.Format("pict%04d.bmp",filecount++); _eZ*_H,\  
 name=m_Path+name; krMO<(x+  
 BITMAPFILEHEADER bfh; tDQuimYu7  
 bfh.bfReserved1=bfh.bfReserved2=0; 0K'^g0G  
 bfh.bfType=((WORD)('M'<< 8)|'B'); <,+nS%a  
 bfh.bfSize=54+size; TjY-C m  
 bfh.bfOffBits=54; ?F" mZu  
 CFile bf; x2h5,.K  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f >$V:e([  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yp?a7t M  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); PHR:BiMZ  
  bf.WriteHuge(lpData,size); []l2 `fS#  
  bf.Close(); Nv5)A=6#AA  
  nCount++; ZwOX ,D  
 } \(`8ng]vs  
 GlobalFreePtr(lpData); 3%L@=q  
 if(nCount==1) 9 $*O^  
  m_Number.Format("%d picture captured.",nCount); C @nA*  
 else @8eQ|.q]Q  
  m_Number.Format("%d pictures captured.",nCount); @(W{_mw  
  UpdateData(FALSE); AlA:MO]NM  
} .K`EflN  
k9m9IE"9=$  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +x]3 - s  
{ ~-f"&@){,  
 if(pMsg -> message == WM_KEYDOWN) *W-:]t3CR  
 { \e9rXh%  
  if(pMsg -> wParam == VK_ESCAPE) `e4gneQY  
   return TRUE; h,zM*zA_  
  if(pMsg -> wParam == VK_RETURN) *ry}T=  
   return TRUE; hxZL/_n'  
 } h.jO3q  
 return CDialog::PreTranslateMessage(pMsg); 3eERY[  
} tA8O( 9OV  
G\(cnqHk  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) O9ar|8y  
{ "cz'|z`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ K_ Odu^  
  SaveBmp(); N|e#&  
  return FALSE; bbs'>D3  
} I=2b)"t0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mqK}y K^P]  
 CMenu pop; YL&)@h  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K~6u5a9s  
 CMenu*pMenu=pop.GetSubMenu(0); T#GTNk!v  
 pMenu->SetDefaultItem(ID_EXITICON); ;6M [d  
 CPoint pt; 'E"W;#%  
 GetCursorPos(&pt); fj97_Q=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); } 89-U  
 if(id==ID_EXITICON) $X,dQ]M  
  DeleteIcon(); 8/k"A-m  
 else if(id==ID_EXIT) M(?0c}z  
  OnCancel(); Mp?L9  
 return FALSE; <,*3Av  
} iAo/Dnp2J  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HCw,bRxm  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) NwyNl  
 AddIcon(); tU0jFBB  
 return res; qLV3Y?S!L  
} 8d7 NESYl  
G%ZP `  
void CCaptureDlg::AddIcon() &%`WXe-`R  
{ <Hr~|oG  
 NOTIFYICONDATA data; ;;|.qgxc~  
 data.cbSize=sizeof(NOTIFYICONDATA); Kay\;fXT  
 CString tip; a}Z+"D  
 tip.LoadString(IDS_ICONTIP); e2yCWolmTS  
 data.hIcon=GetIcon(0); r+k g$+%b  
 data.hWnd=GetSafeHwnd(); rK\9#[?x  
 strcpy(data.szTip,tip); NfWL3"&X  
 data.uCallbackMessage=IDM_SHELL; [ 2PPa9F  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; tl; b~k  
 data.uID=98; (H8JV1J  
 Shell_NotifyIcon(NIM_ADD,&data); DTlId~Dyq  
 ShowWindow(SW_HIDE); SBI *[  
 bTray=TRUE; J7Mbv2D  
} ;!A=YXB  
~@DdN5  
void CCaptureDlg::DeleteIcon() <eZ*LK?  
{ {1gT{2/~@  
 NOTIFYICONDATA data; wYr*('uT  
 data.cbSize=sizeof(NOTIFYICONDATA); U C_$5~8p  
 data.hWnd=GetSafeHwnd(); U;j\FE^+>  
 data.uID=98; Sm{> 8e}UE  
 Shell_NotifyIcon(NIM_DELETE,&data); _F5*\tQ  
 ShowWindow(SW_SHOW); &?$mS'P  
 SetForegroundWindow(); M@o^V(j  
 ShowWindow(SW_SHOWNORMAL); KP&xk1 3)  
 bTray=FALSE; hd]ts.  
} 1m5*MY  
 VeSQq  
void CCaptureDlg::OnChange() 4fL`.n1^  
{ v-BQ>-&s  
 RegisterHotkey(); bObsj]  
} dI|D c  
LmytO$?2(  
BOOL CCaptureDlg::RegisterHotkey() c8T| o=`k6  
{ Y::O*I2  
 UpdateData(); <PiO %w{  
 UCHAR mask=0; >7PNl\=gG  
 UCHAR key=0; 3YJ"[$w='(  
 if(m_bControl) F0~<p[9Nx  
  mask|=4; '/)qI.  
 if(m_bAlt) d&\3}uH  
  mask|=2; !*f$*,=^  
 if(m_bShift) x[0O*ty-*<  
  mask|=1; A$]s{`  
  key=Key_Table[m_Key.GetCurSel()]; 91]sO%3  
 if(bRegistered){ ]T'7+5w  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }=}wLm#&1  
  bRegistered=FALSE; i4]oE&G  
 } gJCZ9{Nl  
 cMask=mask; 2v2XU\u{t  
 cKey=key; $rlrR'[H  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); kIX1u<M~  
 return bRegistered; bAbR0)  
} x|O^#X(,  
.`Q^8|$-K  
  四、小结 #y[U2s Se  
Nk<^ Qv  
  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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