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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: m 'H  
  V.a]IkK'K  
  一、实现方法 '14l )1g.  
jv#" vQ9A]  
  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: ht74h  
*d,n2a#n5  
#pragma data_seg("shareddata") ADl>~3b  
HHOOK hHook =NULL; //钩子句柄 E#X!*q&  
UINT nHookCount =0; //挂接的程序数目 WSB|-Qj}W  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 M(]|}%  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 n)?F 9Wap  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey o? xR[N-J  
static int KeyCount =0; bHH}x"d[x  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 !.GY~f<d$  
#pragma data_seg() Q,qylL  
O/r<VT Op  
  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。 qx<zX\qI6n  
nF[eb{GR`  
  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: +7vh__  
G C#95  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR :tDGNz*zG  
cKey,UCHAR cMask) xXh]z |  
{ z^GGJu%vjr  
 BOOL bAdded=FALSE; (i~%4w=  
 for(int index=0;index<MAX_KEY;index++){ :Y?08/V  
  if(hCallWnd[index]==0){ DmpJzH j|  
   hCallWnd[index]=hWnd; owVUL~  
   HotKey[index]=cKey; _ ~$0cj<  
   HotKeyMask[index]=cMask; 4a-F4j'  
   bAdded=TRUE; >v4~:n2D  
   KeyCount++; X1~A "sW[  
   break; xMGd'l?  
  } {1&,6kJF&9  
 } dz.MH  
 return bAdded; X OtS+p  
} Xwq2;Bq  
//删除热键 ?#y<^oNM  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .4)P=*  
{ WW/m /+  
 BOOL bRemoved=FALSE; 6Kc7@oO~  
 for(int index=0;index<MAX_KEY;index++){ 8l,hP.  
  if(hCallWnd[index]==hWnd){ ",@g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ AhZ  
    hCallWnd[index]=NULL; lMf5F8  
    HotKey[index]=0; qO'5*d;!d  
    HotKeyMask[index]=0; b#'a4j-u  
    bRemoved=TRUE; H;te)km}  
    KeyCount--; W n mRRq^  
    break; Z- Ae'ym  
   } .B n2;nO  
  } Q$5:P&  
 } }u)G ERWO  
 return bRemoved; 4f~ZY]|nM  
} pjn%CR`;  
P z!yIj  
#iU/Yg!  
  DLL中的钩子函数如下: ~"B[6^sW  
_$lQK{@rY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) >#|Q,hVU5  
{ LA Vgf>  
 BOOL bProcessed=FALSE; (3*Hl  
 if(HC_ACTION==nCode) KO"iauW  
 { ?P]md9$(+e  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 RuuU}XQ  
   switch(wParam) VX%\_@  
   {  bGa":|}F  
    case VK_MENU: ^;_b!7*  
     MaskBits&=~ALTBIT; e.H"!X!0#H  
     break; @vh>GiR){  
    case VK_CONTROL: /q]@|5I  
     MaskBits&=~CTRLBIT; %>z}P&Yz  
     break; xFnMXh t  
    case VK_SHIFT: B9-=.2.WU  
     MaskBits&=~SHIFTBIT; nQ6'yd"  
     break; ugP R)tDfM  
    default: //judge the key and send message ?A>-_B  
     break; *k$&Hcr$  
   }  i9"1  
   for(int index=0;index<MAX_KEY;index++){ \_'pUp22  
    if(hCallWnd[index]==NULL) 9-SXu lgu  
     continue; &YMj\KmlSg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uuB\~ #?T  
    { \I]'6N=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); p}uw-$O  
     bProcessed=TRUE; (*tJCz`Sj  
    } UW3F)  
   } )]R8 $S  
  } 8uiQm;W  
  else if((lParam&0xc000ffff)==1){ //有键按下 4|thDb)]  
   switch(wParam)  ovO^uWz`  
   { 'fsOKx4Z  
    case VK_MENU: q?\D9aT9  
     MaskBits|=ALTBIT; 6qf`P!7d]M  
     break; @pz2}Hd |  
    case VK_CONTROL: v/dcb%  
     MaskBits|=CTRLBIT; b"b!&u  
     break; 3u<2~!sR  
    case VK_SHIFT: jF8ld5|_|  
     MaskBits|=SHIFTBIT; ?1sY S  
     break; k6\c^%x  
    default: //judge the key and send message kE}?"<l  
     break; F(r &:3!97  
   } u9Ro=#xt  
   for(int index=0;index<MAX_KEY;index++){ iatQHn >(  
    if(hCallWnd[index]==NULL) 7=9jXNk Y  
     continue;  "(xu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0OXd*  
    { 4M}/PoJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >e%Po,Fg$  
     bProcessed=TRUE; JYq} YG=%  
    } nYY U  
   } y-YYDEl  
  } 9w1)Mf}  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )XFMlSx)  
   for(int index=0;index<MAX_KEY;index++){ V#gXchH[L  
    if(hCallWnd[index]==NULL) Sl1N V  
     continue; 'J}lnt[V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &oBJY'1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :L,]<n  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 O7W}Z1G  
   } X'Oo ogu  
  } !?96P|G  
 } %zGPF  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); kI]1J  
} W!g ,  
N{'k ]&  
  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: q:( K^  
"F^EfpcJ{9  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;Zw28!#Rt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); b$BUo8O}  
qQb8K+t  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: #Xc~3rg9  
^0 t`EZ$  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) oq|K:<l  
{ JO$0Z  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9X-DR  
 { 8w\&QX  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ?h5Y^}8Qg  
  SaveBmp(); #(7OvW+y  
  return FALSE; ji1A>jepF  
 } Y=5hm  
 …… //其它处理及默认处理 Ruf*aF(  
} \(u P{,ML  
N.fIg  
ALG +  
  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。 vt1!|2{ h  
I;No++N0  
  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。  z\ \MLyS  
-+z^{*\; N  
  二、编程步骤 bv+PbK]iO  
Q>|<R[.7  
  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"; p4/D%*G^`  
2JbCYCTC  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uQ{M<%K  
Y,+$vj:y8  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; s}5;)>3~@  
J~~WV<6  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; Ts.6 1Rx  
7{p,<Uz<"U  
  5、 添加代码,编译运行程序。 c+q4sNnE  
\KTX{qI"f  
三、程序代码 Cjw|.c`  
PJ);d>tz  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL rK"x92P0  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) -&+[/  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ WzF/wzR  
#if _MSC_VER > 1000 /WfpA\4S  
#pragma once \h:$q E7  
#endif // _MSC_VER > 1000 #HqXC\~n  
#ifndef __AFXWIN_H__ 7%C6gU!r  
#error include 'stdafx.h' before including this file for PCH L9@nx7D  
#endif ^W;\faG  
#include "resource.h" // main symbols E<0Y;tR  
class CHookApp : public CWinApp tX)^$3A  
{ e~xN[Q\0]  
 public: BjSLbw-C  
  CHookApp(); dtJ?J<m}  
  // Overrides 1a`dB ~>  
  // ClassWizard generated virtual function overrides n%A)#AGGc  
  //{{AFX_VIRTUAL(CHookApp) wgY: W:y'N  
 public: 2Lm.;l4YO  
  virtual BOOL InitInstance(); [$$i1%c%Z<  
  virtual int ExitInstance(); ht)J#Di  
  //}}AFX_VIRTUAL |pA3ZWm  
  //{{AFX_MSG(CHookApp) ,-D3tleu`  
  // NOTE - the ClassWizard will add and remove member functions here. T=%,^  
  // DO NOT EDIT what you see in these blocks of generated code ! `5:b=^'D /  
  //}}AFX_MSG C`Zz\DNG@  
  DECLARE_MESSAGE_MAP() rjz$~(&m6  
}; )k$ +T%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); /d*d'3{c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IBZ_xU\2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 'a[|'  
BOOL InitHotkey(); E0G"B' x  
BOOL UnInit(); 4J{6Wt";  
#endif vL}e1V:  
GUSEbIz):  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. NH~\kV  
#include "stdafx.h" H[S[ y  
#include "hook.h" 5o2w)<d!  
#include <windowsx.h> x}B3h9]  
#ifdef _DEBUG u7L&cx  
#define new DEBUG_NEW Cl&YN}t5  
#undef THIS_FILE "n'kv!?\  
static char THIS_FILE[] = __FILE__; UU'0WIbY6  
#endif n<3qr}ZG^  
#define MAX_KEY 100 ip8%9fG\>  
#define CTRLBIT 0x04 VUmf;~  
#define ALTBIT 0x02 :J6 xYy$  
#define SHIFTBIT 0x01 j]P'xrWl]8  
#pragma data_seg("shareddata") x,L<{A`z  
HHOOK hHook =NULL; *!NxtB!LC  
UINT nHookCount =0; $Y`oqw?g+^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey (P'{A>aHl0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT p4-UW;Xu  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 5Q7Z$A1a 9  
static int KeyCount =0; ? `hA:X<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift '-X[T}  
#pragma data_seg() YpJJ]Rszg  
HINSTANCE hins; q]Vxf!0*>  
void VerifyWindow(); 'Y2ImSWj  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g|TWoRx:  
//{{AFX_MSG_MAP(CHookApp) z_f^L %J0  
// NOTE - the ClassWizard will add and remove mapping macros here. f*o+g:]3  
// DO NOT EDIT what you see in these blocks of generated code! ?mwa6]  
//}}AFX_MSG_MAP /L{V3}[j  
END_MESSAGE_MAP() WF] |-)vw  
-kzp >=  
CHookApp::CHookApp() j[CXIz?c  
{ cS#yfN,  
 // TODO: add construction code here, 0hg4y  
 // Place all significant initialization in InitInstance 8Wba Hw_  
} 56o(gCj?y  
PCx:  
CHookApp theApp; Q@ua G,6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) hh!4DHv   
{ X4eoE  
 BOOL bProcessed=FALSE; dk/f_m  
 if(HC_ACTION==nCode) G4rd<V0[D  
 { (}m2}  
  if((lParam&0xc0000000)==0xc0000000){// Key up [nA1WFfM  
   switch(wParam) (T!#7  
   { x7GYWK 9  
    case VK_MENU: @d|3c7` A  
     MaskBits&=~ALTBIT; TXT!Ae  
     break; &6e A.  
    case VK_CONTROL: |@5G\N-  
     MaskBits&=~CTRLBIT; .WLwAL  
     break; _1G;!eO  
    case VK_SHIFT:  oP~%7Jt  
     MaskBits&=~SHIFTBIT; H1c>3c  
     break; 068DC_  
    default: //judge the key and send message +,]_TxL|C  
     break; bgeJVI  
   } Qe =8x7oIP  
   for(int index=0;index<MAX_KEY;index++){ ^+w1:C5  
    if(hCallWnd[index]==NULL) .On3ZN  
     continue; 3"Zc|Ck <?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) []doLt;J  
    { 5(t hDZ!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); vRb7=fXf  
     bProcessed=TRUE; iUbcvF3aP  
    }  Q!5W x  
   } eus@;l*  
  } 5?A<('2  
  else if((lParam&0xc000ffff)==1){ //Key down O03F@v  
   switch(wParam) q'9;  
   { d ATAH}r&  
    case VK_MENU: XVF!l>nE  
     MaskBits|=ALTBIT; FqZD'Uu7  
     break; 1,Jy+1G0w  
    case VK_CONTROL: jX .' G   
     MaskBits|=CTRLBIT; 1:RK~_E  
     break; f\FqZ?w  
    case VK_SHIFT: Z+=WICI/2  
     MaskBits|=SHIFTBIT; qOAP_\@T  
     break; MP_/eC ;  
    default: //judge the key and send message #r,!-;^'p  
     break; h1y3gl[;TD  
   } tkmzOc H  
   for(int index=0;index<MAX_KEY;index++) p0D@O_ :5  
   { vuZ'Wo:S{  
    if(hCallWnd[index]==NULL) b'I@TLE')  
     continue; >3,}^`l  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (Vn3g ra  
    { nchpD@'t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); *uSlp_;kB  
     bProcessed=TRUE; If8Lt}-  
    } Xy}>O*  
   } 2*V]jO  
  } 8K@e8p( y  
  if(!bProcessed){ t qUBl?i  
   for(int index=0;index<MAX_KEY;index++){ <nK@+4EH"o  
    if(hCallWnd[index]==NULL) #=72 /[  
     continue; R2Lq??XA=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pU<GI@gU  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); efuiFN;  
   } I+`>e*:@W  
  } M,cz7,  
 } T+S\'f\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); eep/96G ?  
} b>9?gmR{  
=@&>r5W1  
BOOL InitHotkey() 4pZKm-dM^  
{ >p`i6_P0P/  
 if(hHook!=NULL){ c[;A$P= 8.  
  nHookCount++; rCb$^(w{7  
  return TRUE; {E}D6`{  
 } o}D }Q"=A  
 else 2@Q5Ta #h  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7<(kvE*x  
  if(hHook!=NULL) 9ph>4u(R  
   nHookCount++; 9Z"WV5o  
  return (hHook!=NULL); =$T[  
} U lCw{:#F  
BOOL UnInit() y3bL\d1  
{ e;LC\*dG  
 if(nHookCount>1){ mE'HRv  
  nHookCount--; ,s 6lB0  
  return TRUE; sn Ou  
 } :f7:@8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); sxdDI?W4  
 if(unhooked==TRUE){ aCi)icn$  
  nHookCount=0; K,+z^{Hvh  
  hHook=NULL; - ^Y\'y2  
 } .bRtK+}F#  
 return unhooked; E_P,>f  
} b?2 \j}  
nITkgN:s  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `=kiqF2P}  
{ F>?~4y,b7  
 BOOL bAdded=FALSE; _`Y%Y6O1/  
 for(int index=0;index<MAX_KEY;index++){ e@ 5w?QzW  
  if(hCallWnd[index]==0){ :bCswgd[  
   hCallWnd[index]=hWnd; F3 g$b,RMH  
   HotKey[index]=cKey; #MviO!@  
   HotKeyMask[index]=cMask; @PK 1  
   bAdded=TRUE; \5a;_N[Ed  
   KeyCount++; vrh2}biCR  
   break; i3) 7Qa[  
  } ! GtF%V  
 } ^rGuyW#  
 return bAdded; LaL{ ^wP  
} q4vHsy36  
Cd_H<8__  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]<9o>#3  
{ T:!H^  
 BOOL bRemoved=FALSE; [vnxp/v/<  
 for(int index=0;index<MAX_KEY;index++){ z)R\WFBW  
  if(hCallWnd[index]==hWnd){ %wGQu;re  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ :#UA!| nV  
    hCallWnd[index]=NULL; @# . a5  
    HotKey[index]=0; `:dGPB BO  
    HotKeyMask[index]=0;   [ L  
    bRemoved=TRUE; {>Qs+]  
    KeyCount--; ,0?3k  
    break; "ER= c3 t  
   } xo(>nFjo  
  } =7S\-{  
 } 5X9*K  
 return bRemoved; y#nyH0U  
} D/z*F8'c  
oP:OurX8V  
void VerifyWindow() uK[gI6M  
{ 3)l<'~"z<  
 for(int i=0;i<MAX_KEY;i++){ Q.f D3g  
  if(hCallWnd!=NULL){ {!pYQ|#  
   if(!IsWindow(hCallWnd)){ jtwe9  
    hCallWnd=NULL; /vqsp0e"H  
    HotKey=0; cdg &)  
    HotKeyMask=0; n,p \~Tu,  
    KeyCount--; %D ,(S-Uj  
   } iUS?xKN$~-  
  } Ft@ZK!'@  
 } '~xjaa;.  
} hM8FN  
:eSwXDy&  
BOOL CHookApp::InitInstance() OuB [[L  
{ k[1w] l8  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <7j"CcJzZ  
 hins=AfxGetInstanceHandle(); K3`48,`?wA  
 InitHotkey(); bFfDaO<k  
 return CWinApp::InitInstance(); iv6bXV'N  
} x' 3kHw  
ho6,&Bp8  
int CHookApp::ExitInstance() c`#4}$  
{ l^v,X%{Iz  
 VerifyWindow(); f/i[? gw  
 UnInit(); W\z<p P  
 return CWinApp::ExitInstance(); 2VkA!o4nP  
} =fI0q7]ndz  
B_0]$D0 ^  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 7zu3o  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ?M04 cvm  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ^NO;A=9b[  
#if _MSC_VER > 1000 dg;E,'e_ p  
#pragma once {G _|gs  
#endif // _MSC_VER > 1000 P1"g62R  
.u;'eVH)a}  
class CCaptureDlg : public CDialog 62>/0_m5  
{  83:qIfF  
 // Construction 9`DY6qfly  
 public: |d_ rK2  
  BOOL bTray; @C5 %`{\  
  BOOL bRegistered; 'h{DjNSM  
  BOOL RegisterHotkey(); )H1chNI)  
  UCHAR cKey; 15!b]':  
  UCHAR cMask; Mm#=d?YUHJ  
  void DeleteIcon(); i-&"1D[&  
  void AddIcon(); |r53>,oR<:  
  UINT nCount; "z|%V/2b3  
  void SaveBmp(); V;]U]   
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor M,N(be-  
  // Dialog Data zKaEh   
  //{{AFX_DATA(CCaptureDlg) A>}]=Ii/  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8j!(*'J.  
  CComboBox m_Key; L&~>(/*7U  
  BOOL m_bControl; "RsH'`  
  BOOL m_bAlt; Re'Ek  
  BOOL m_bShift; u9dL-Nr`  
  CString m_Path; 8\8%FSrc  
  CString m_Number; zy[|4Q(?  
  //}}AFX_DATA wGA%h.[M|  
  // ClassWizard generated virtual function overrides v:@ud,d<  
  //{{AFX_VIRTUAL(CCaptureDlg) Jf8AKj3  
 public: !)'|Y5 o  
  virtual BOOL PreTranslateMessage(MSG* pMsg); "_/5{Nc$  
 protected: Q$DF3[NC  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iMOf];O)  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ]ch=D  
  //}}AFX_VIRTUAL %q,^A+=  
  // Implementation (Zu V5|N  
 protected: JZrUl^8E  
  HICON m_hIcon; U*em)/9  
  // Generated message map functions 60Obek`  
  //{{AFX_MSG(CCaptureDlg) @?"t&h  
  virtual BOOL OnInitDialog(); ,<?M/'4}G  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); jRIm_)  
  afx_msg void OnPaint(); &g-uQBQI#  
  afx_msg HCURSOR OnQueryDragIcon(); )Z2t=&Nw  
  virtual void OnCancel(); Gu9x4p  
  afx_msg void OnAbout(); Li\BRlebR{  
  afx_msg void OnBrowse(); )?PRG=  
  afx_msg void OnChange(); oJTsrc_ -  
 //}}AFX_MSG ~j2=hkS  
 DECLARE_MESSAGE_MAP() '$n#~/#}  
}; *d/]-JN,K  
#endif CDM==Xa*  
OHha5n  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +bK.{1  
#include "stdafx.h" %S<( z5  
#include "Capture.h"  g8_IZ(%:  
#include "CaptureDlg.h" VG`A* Vj  
#include <windowsx.h> <=,KP)   
#pragma comment(lib,"hook.lib") 7eg//mL"6  
#ifdef _DEBUG O(E-ox~q  
#define new DEBUG_NEW "i_}\p.,X  
#undef THIS_FILE XP-4=0zd  
static char THIS_FILE[] = __FILE__; oFRb+H(E  
#endif )(pJ~"'L  
#define IDM_SHELL WM_USER+1 J ;wA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {L8(5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4n@, p0   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; c!%:f^7g  
class CAboutDlg : public CDialog 2v<[XNX  
{ prY9SQd  
 public: h D/b O  
  CAboutDlg(); s"|N-A=cS  
  // Dialog Data 8Q1){M9 '  
  //{{AFX_DATA(CAboutDlg) d0 tN73(  
  enum { IDD = IDD_ABOUTBOX }; '4A8\&lQO  
  //}}AFX_DATA m H'jr$ ?  
  // ClassWizard generated virtual function overrides !2N#H~{  
  //{{AFX_VIRTUAL(CAboutDlg) 6X:- Z 3  
 protected: jL)aU> kN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support R@0ELxzA  
  //}}AFX_VIRTUAL .n`MPx'  
  // Implementation \?fl%r2  
 protected: d}',Bl+u{$  
  //{{AFX_MSG(CAboutDlg) b`K~l'8  
  //}}AFX_MSG "FaG5X(  
  DECLARE_MESSAGE_MAP() )[)-.{q  
}; 6#5@d^a  
9bXU!l[  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nZN]Q9  
{ k 9Kv  
 //{{AFX_DATA_INIT(CAboutDlg) 1)NX;CN  
 //}}AFX_DATA_INIT j &Ayk*  
} | _~BV&g,N  
'eqvK|Uj:  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )11/BB\v  
{ yZFv pw|g  
 CDialog::DoDataExchange(pDX); &H5 6mL{  
 //{{AFX_DATA_MAP(CAboutDlg) 4[.- a&!}  
 //}}AFX_DATA_MAP VV] {R'  
} QbqLj>-AJ  
?-\KVha  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &"C1XM  
 //{{AFX_MSG_MAP(CAboutDlg) %v~j10e  
 // No message handlers ~`_nw5y  
 //}}AFX_MSG_MAP OR"ni  
END_MESSAGE_MAP() 6x/ X8zu  
_W#27I  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ) _2!1  
: CDialog(CCaptureDlg::IDD, pParent) [TO:- 8$.  
{ YBS]JCO  
 //{{AFX_DATA_INIT(CCaptureDlg) 4 <]QMA0  
  m_bControl = FALSE; JBUJc  
  m_bAlt = FALSE; vW)GUAF[  
  m_bShift = FALSE; oS,<2Z  
  m_Path = _T("c:\\"); J;_JH lK  
  m_Number = _T("0 picture captured."); <U,T*Ql1x  
  nCount=0; |+`hSA  
  bRegistered=FALSE; B~PF<8h5  
  bTray=FALSE; "F[VqqD  
 //}}AFX_DATA_INIT #{ Uk4  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Gh{k~/B  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); *.nqQhW  
} \v-> '  
zRE7 w:  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Zp__  
{ acGmRP9g  
 CDialog::DoDataExchange(pDX); wH${q@z_  
 //{{AFX_DATA_MAP(CCaptureDlg) 06Hn:IT18  
  DDX_Control(pDX, IDC_KEY, m_Key); 3&?Tc|F+  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); y:|7.f  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Bxa],inuZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ?4lAL  
  DDX_Text(pDX, IDC_PATH, m_Path); nM0nQ{6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); z ~VA#8>  
 //}}AFX_DATA_MAP U.^)|IHW  
} h;ShNU  
"!Qhk3*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) H`Z4a N  
//{{AFX_MSG_MAP(CCaptureDlg) #!`zU4&2  
 ON_WM_SYSCOMMAND() dl":?D4H  
 ON_WM_PAINT() 'g=yJ  
 ON_WM_QUERYDRAGICON() RD_;us@&&*  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -dvDAs{X  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q^p@ 1I  
 ON_BN_CLICKED(ID_CHANGE, OnChange) +tV(8h4  
//}}AFX_MSG_MAP UxS;m4  
END_MESSAGE_MAP() o"]eAQ  
$&e(V6A@  
BOOL CCaptureDlg::OnInitDialog() xY~ DMcO?  
{ BO9Z "|"  
 CDialog::OnInitDialog(); AV2q*  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5r+0^UAO:J  
 ASSERT(IDM_ABOUTBOX < 0xF000); %DV@2rC<  
 CMenu* pSysMenu = GetSystemMenu(FALSE); S|>Up%{n[  
 if (pSysMenu != NULL) %#] T.g  
 { ?D\%ZXo  
  CString strAboutMenu; _$bx4a  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Z?X$8o^Z  
  if (!strAboutMenu.IsEmpty()) )>Lsj1qk  
  { {!/y@/NK2  
   pSysMenu->AppendMenu(MF_SEPARATOR); .nSupTyG  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?\O+#U%W  
  } 9=kTTFs  
 } 5~44R@`  
 SetIcon(m_hIcon, TRUE); // Set big icon v =?V{"wk!  
 SetIcon(m_hIcon, FALSE); // Set small icon FI/YJ@21  
 m_Key.SetCurSel(0); zhCI+u4/qz  
 RegisterHotkey(); )-QNWN H  
 CMenu* pMenu=GetSystemMenu(FALSE); ,X$Avdc2  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); | 5L1\O8#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); KqSa"76R  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P5d@-l%}  
 return TRUE; // return TRUE unless you set the focus to a control :O!G{./(_  
} nEp'l.T  
|,7J!7T(I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) @LE?XlhD  
{ pS<b|wu?f  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) $3[cBX.=  
 { #y*=UV|h  
  CAboutDlg dlgAbout; K?;p:  
  dlgAbout.DoModal(); &=?`;K  
 } m+m6"yE#_  
 else \Zh)oUHd  
 { __V]HcP;  
  CDialog::OnSysCommand(nID, lParam); ^ 2AF:(E  
 } D}061~zb$  
} eFnsf}(Iy  
n% ` r  
void CCaptureDlg::OnPaint() (O-)uC  
{ ~c="<xBE  
 if (IsIconic()) z^Jl4V  
 { b$ x"&&   
  CPaintDC dc(this); // device context for painting ~`})x(!  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); X<m%EXvV  
  // Center icon in client rectangle 3N bn|_`(  
  int cxIcon = GetSystemMetrics(SM_CXICON); 4y1> !~f  
  int cyIcon = GetSystemMetrics(SM_CYICON); 7>zKW?  
  CRect rect; ?V{k\1A  
  GetClientRect(&rect); Ad,r(0a LZ  
  int x = (rect.Width() - cxIcon + 1) / 2; qbEj\ b[  
  int y = (rect.Height() - cyIcon + 1) / 2; 9V66~Bf5  
  // Draw the icon  hY1|qp  
  dc.DrawIcon(x, y, m_hIcon); Asl H V@K  
 } L@z !,r,  
 else a`-hLX)~Z  
 { ];I|_fXo%  
  CDialog::OnPaint(); 1SFKP$^  
 } XsOOkf\_  
} C^%zV>o  
9_Re,h  
HCURSOR CCaptureDlg::OnQueryDragIcon() "pZ3  
{ {IMzR'PN  
 return (HCURSOR) m_hIcon; 8Wj=|Ow-q  
} fMQ*2zGu95  
UC1!J =f  
void CCaptureDlg::OnCancel() +r0eTP=zf  
{ 4{DeF@@  
 if(bTray) yo*iv+l  
  DeleteIcon(); /,Rca1W  
  CDialog::OnCancel(); nFfCw%T?  
} }91mQ`3  
H<;Fb;b  
void CCaptureDlg::OnAbout() *!'&:  
{ mU=6"A0 U  
 CAboutDlg dlg; Ib2@Wi   
 dlg.DoModal(); KCk?)Qv  
} >-w=7,?'?z  
BJ9sR.yX62  
void CCaptureDlg::OnBrowse() h6h1.lZ  
{ A(n=kx  
 CString str; \ZFQ?e,d  
 BROWSEINFO bi; mbBRuPEa=u  
 char name[MAX_PATH]; pIu H*4Vz  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); -m160k3  
 bi.hwndOwner=GetSafeHwnd(); B"PHJj  
 bi.pszDisplayName=name; -L9R&r#_e  
 bi.lpszTitle="Select folder"; p? ?/r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; }Hz-h4Z  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _g 4 /%  
 if(idl==NULL) `XxG"k\/S  
  return; O4/n!HOb  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d=Do@) m|  
 str.ReleaseBuffer(); -(w~LT$ "  
 m_Path=str; EB>B,#  
 if(str.GetAt(str.GetLength()-1)!='\\') P!y`$Ky&  
  m_Path+="\\"; ?Y{^un  
 UpdateData(FALSE); ay(!H~q_U  
} % kx ^/DH  
# \; >8  
void CCaptureDlg::SaveBmp() ^ L ^F=qx  
{ d>, V  
 CDC dc; nnE_OK!}T  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); mhk/>+hF  
 CBitmap bm; "W@XP+POAY  
 int Width=GetSystemMetrics(SM_CXSCREEN); 3%R{"Q"  
 int Height=GetSystemMetrics(SM_CYSCREEN); u:k:C  
 bm.CreateCompatibleBitmap(&dc,Width,Height); kwHqvO!G  
 CDC tdc; gKN}Of@^1  
 tdc.CreateCompatibleDC(&dc); h/Hl?O8[  
 CBitmap*pOld=tdc.SelectObject(&bm); A)z PaXZ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *J_iXu|  
 tdc.SelectObject(pOld); OB6J.dF[%  
 BITMAP btm; [?chK^8  
 bm.GetBitmap(&btm); sEce{"VC  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; /vjGjb=3U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); s=d+GMa  
 BITMAPINFOHEADER bih; ;1W6"3t-Y  
 bih.biBitCount=btm.bmBitsPixel; $Z;BQJVH  
 bih.biClrImportant=0; d/{Q t  
 bih.biClrUsed=0; fcRj  
 bih.biCompression=0; p9-0?(]  
 bih.biHeight=btm.bmHeight; G02ox5X  
 bih.biPlanes=1; RF_[?O)Q  
 bih.biSize=sizeof(BITMAPINFOHEADER); 6&89~W{  
 bih.biSizeImage=size; m0A#6=<  
 bih.biWidth=btm.bmWidth; 6b?`:$Cw3)  
 bih.biXPelsPerMeter=0; lhqQ CV  
 bih.biYPelsPerMeter=0; {A|bBg1!  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); QDS0ejhp  
 static int filecount=0; XHxz @_rw  
 CString name; 1SW4Y  
 name.Format("pict%04d.bmp",filecount++); #?9 Q{0e  
 name=m_Path+name; 0 y< k][  
 BITMAPFILEHEADER bfh; eC~ jgB  
 bfh.bfReserved1=bfh.bfReserved2=0; ->\N_|_  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ]pnYvXf>!  
 bfh.bfSize=54+size; 91u p^   
 bfh.bfOffBits=54; ~r<p@k=.#0  
 CFile bf; <_9!  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ga-{!$b*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); R2w`Y5#`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); j 1(T )T  
  bf.WriteHuge(lpData,size); u_.HPA  
  bf.Close(); P@gt di(Q  
  nCount++; d$K=c1  
 } "u;YI=+  
 GlobalFreePtr(lpData); KAed!z9  
 if(nCount==1) Wr5Q5s)c  
  m_Number.Format("%d picture captured.",nCount); (S F1y/g@=  
 else @`wn<%o$  
  m_Number.Format("%d pictures captured.",nCount); S[mM4et|  
  UpdateData(FALSE); q#N R32byF  
} t?{B_Bf  
!\;:36B#6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e.l!3xY2'  
{ _A 2Lv]vfV  
 if(pMsg -> message == WM_KEYDOWN) QR"bYQ  
 { Nb;H`<JP  
  if(pMsg -> wParam == VK_ESCAPE) n'K6vW3  
   return TRUE; DyfsTx  
  if(pMsg -> wParam == VK_RETURN) 6Y1J2n"  
   return TRUE; vXdZmYrC  
 } \9)#l#m  
 return CDialog::PreTranslateMessage(pMsg); /p)F>WR  
} )KY:m |Z  
8o|P&q(v*  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C>X|VP |C  
{ .!RavEg+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ J8<J8x4  
  SaveBmp(); 7,'kpyCj  
  return FALSE; >A}0Ho  
} 5HKW"=5Cf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ oNM?y:O  
 CMenu pop; XErUS80  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); V8PLFt;  
 CMenu*pMenu=pop.GetSubMenu(0); #@qN8J}R  
 pMenu->SetDefaultItem(ID_EXITICON); ?6P.b6m}0  
 CPoint pt; zO~9zlik  
 GetCursorPos(&pt); 8TWTbQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); cozXb$bBY  
 if(id==ID_EXITICON) 5`-UMz<]  
  DeleteIcon(); #0"~G][#  
 else if(id==ID_EXIT) N|:'XwL  
  OnCancel();  L}%dCe  
 return FALSE; u[oUCTY  
} %Mn.e a  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 6bO~/mpWT~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 60}! LmL  
 AddIcon(); 2/7_;_#vJ%  
 return res; E167=BD9<  
} A??@AP[7M  
9YN?  
void CCaptureDlg::AddIcon() m:+8J,jW  
{ pz|'l:v^  
 NOTIFYICONDATA data; p9qKLJ*.C  
 data.cbSize=sizeof(NOTIFYICONDATA); V416g |lBO  
 CString tip; y$W|~ H   
 tip.LoadString(IDS_ICONTIP); J CGC  
 data.hIcon=GetIcon(0); Pm{*.AW1  
 data.hWnd=GetSafeHwnd(); LnsD  
 strcpy(data.szTip,tip); ,h]o>  
 data.uCallbackMessage=IDM_SHELL; n,'OiVl[  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; l$xxrb9P!  
 data.uID=98; '0RwO[A#1  
 Shell_NotifyIcon(NIM_ADD,&data); u1^wDc*xg  
 ShowWindow(SW_HIDE); ,&^3Z  
 bTray=TRUE; +A8j@d#:  
} s5&@Cxzl  
G$M9=@Ug  
void CCaptureDlg::DeleteIcon() pB:$lS  
{ OO) ~HV4\  
 NOTIFYICONDATA data; f9u^R=Ff[  
 data.cbSize=sizeof(NOTIFYICONDATA); BUZ _)  
 data.hWnd=GetSafeHwnd(); 0&+k.Vg  
 data.uID=98; z+{,WHjo  
 Shell_NotifyIcon(NIM_DELETE,&data); NAC_pM&B  
 ShowWindow(SW_SHOW); O[^%{'  
 SetForegroundWindow(); OhZgcUqQ8  
 ShowWindow(SW_SHOWNORMAL); 4u;9J*r4  
 bTray=FALSE; Jju#iwb  
} ~&dyRt W4  
}yn0IWVa  
void CCaptureDlg::OnChange() bm~W EX  
{ eV^d6T$  
 RegisterHotkey(); -Apc$0ZsN  
} rqPo)AL  
VosZJv=  
BOOL CCaptureDlg::RegisterHotkey() WsU)Y&  
{ B!]2Se2G  
 UpdateData(); {$D,?V@%_  
 UCHAR mask=0; uA t V".  
 UCHAR key=0; 6RO(]5wX  
 if(m_bControl) t_z>Cl^u  
  mask|=4; ?t&kb7  
 if(m_bAlt) r|Z3$J{^"  
  mask|=2; S^@S%Eg  
 if(m_bShift) Dr&('RZ4  
  mask|=1; 1@48BN8cm'  
  key=Key_Table[m_Key.GetCurSel()]; \*hrW(   
 if(bRegistered){ ^ |~ml Y@w  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); H<hVTc{K  
  bRegistered=FALSE; tsOrt3   
 } MB^~%uZ2K  
 cMask=mask; C&LBr|  
 cKey=key; +Mewo  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); P9Yy9_a|x  
 return bRegistered; 8 ;d$54 b  
} {'sY|lou  
N[]Hc  
  四、小结 >2$5eI  
/n~\\9#3  
  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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