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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: .^uYr^( |[  
  ^g n7DiIPH  
  一、实现方法 u_ym=N57`  
-r6LndQs  
  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: %|By ?i  
gz"I=9  
#pragma data_seg("shareddata") JA^Y:@<{/  
HHOOK hHook =NULL; //钩子句柄 4B@L<Rl{\  
UINT nHookCount =0; //挂接的程序数目 },tn  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 C)0JcM  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 U~{sJwB  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey J(x42Q}*S  
static int KeyCount =0; 7Ust7%  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 pkEqd"G  
#pragma data_seg() OYNPZRu  
/9 soUt  
  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。 _cXLQ)-  
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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: `n~bDG>  
wLH[rwPr  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR n$(_(&  
cKey,UCHAR cMask) O8WLulo  
{ ADN  
 BOOL bAdded=FALSE; G+f@m,  
 for(int index=0;index<MAX_KEY;index++){ VtC1TZ3-7  
  if(hCallWnd[index]==0){ ;/.XAxkFL  
   hCallWnd[index]=hWnd; !l1ycQM  
   HotKey[index]=cKey; -<WQ>mrB&  
   HotKeyMask[index]=cMask; %wS5m#n  
   bAdded=TRUE; [|\BuUT'  
   KeyCount++; \^rAH@  
   break; <YBA 7i  
  } *ZA.O  
 } >2?O-WXe  
 return bAdded; 0=Z_5.T>  
} uE{nnNZy  
//删除热键 vOYG&)Jm  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A!j6JY.w  
{ I^fKZ^]8P  
 BOOL bRemoved=FALSE; tV,Y38e  
 for(int index=0;index<MAX_KEY;index++){ `O|PP3S  
  if(hCallWnd[index]==hWnd){ or1D 6 *'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &B5@\Hd;  
    hCallWnd[index]=NULL; }[*BC5{>  
    HotKey[index]=0; EBPm7{&0|  
    HotKeyMask[index]=0; hM @F|t3  
    bRemoved=TRUE; ,V2,FoJ 9  
    KeyCount--; ^8r4tX  
    break; !|gln)|A  
   } 1]vrpJw  
  } uyITUvPg[  
 } N!&$fhY)  
 return bRemoved; 6P KH%  
} 4RV5:&ALLS  
o Z#4<7K  
tMWsgK.B  
  DLL中的钩子函数如下: 8P'zQ:#RV  
-hIDL'5u-I  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i''[ u  
{ 2qD80W<1  
 BOOL bProcessed=FALSE; a,sU-w!X'  
 if(HC_ACTION==nCode) h&}XG\ioNA  
 { L0H kmaH  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @4N@cM0   
   switch(wParam) &\, ZtaB  
   {  H%:~&_D  
    case VK_MENU: 8'B   
     MaskBits&=~ALTBIT; %2)'dtPD~  
     break; lC ^NhQi  
    case VK_CONTROL: *?Sp9PixP  
     MaskBits&=~CTRLBIT;  #{8n<sE  
     break; EJrn4QOs  
    case VK_SHIFT: JtrLTo  
     MaskBits&=~SHIFTBIT; ,U#$Qb 12  
     break; w1+xlM,,9  
    default: //judge the key and send message r-$SF5uv  
     break; |?Z;tAF!  
   } ^Pk-<b4}  
   for(int index=0;index<MAX_KEY;index++){ tOK lCc  
    if(hCallWnd[index]==NULL) {$ghf"  
     continue; C 4 &1M  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7VdG6`TDR  
    { P+Ta|-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); (Wu_RXfCw_  
     bProcessed=TRUE; Q!<b"8V]  
    } qUY QN2wG  
   } ]#N~r&hmQ  
  } +) 4_1i4"x  
  else if((lParam&0xc000ffff)==1){ //有键按下 jHj*S9:`  
   switch(wParam) od\Q<Jm}  
   { "&ElKy 7j  
    case VK_MENU: vq~btc.p{&  
     MaskBits|=ALTBIT; ?6gC;B  
     break; N!}r(Dd*  
    case VK_CONTROL: 9?M><bBX  
     MaskBits|=CTRLBIT; \i-HECc"U  
     break; (@H'7,  
    case VK_SHIFT: )h0F'MzW  
     MaskBits|=SHIFTBIT; *LbRLwt  
     break; Ih]'OaE   
    default: //judge the key and send message I-Ya#s#m  
     break; lth t'|  
   } W`KRaL0^  
   for(int index=0;index<MAX_KEY;index++){ j`Xe0U<  
    if(hCallWnd[index]==NULL) 8pfQAzl  
     continue; ZS@Cd9*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ptXLWv`  
    { 4A_}:nU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %z&=A%'a  
     bProcessed=TRUE; ]R8}cbtU  
    } ROr..-[u  
   } +IiL(\ew  
  } ~7tG%{t%  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 u:Q_XXT5  
   for(int index=0;index<MAX_KEY;index++){ S"iz fQ@  
    if(hCallWnd[index]==NULL) UGNFWZ c  
     continue; {]aB3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &n.7~C]R  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); [WDtr8L  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 AKVll  
   } Htseu`>_$  
  } 0i2ZgOJ  
 } DbdxHuKa>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !YlyUHD  
} );*A$C9RA  
E}aTH  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 5fK#*(x  
Y!C=0&p  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ` gIlS^Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M~Yho".  
"Ldi<xq%xl  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Jb'M/iG  
`CP}1W>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) z}vgp\cuT  
{ CY&Z*JI"'B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]~:9b[G2  
 { SbmakNWJ}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 kETu@la}  
  SaveBmp(); 3[: |)i)  
  return FALSE; g|r:+%,M  
 } RzG<&a3B3s  
 …… //其它处理及默认处理 )6# i>c-  
} f)p c$~B  
-v*wT*I1  
&<Bx1\ ~V  
  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。 0Bx.jx0?  
^ 1rw\Zp  
  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。 , 4Vr,?"EO  
6vrMR& #a  
  二、编程步骤 "pb,|U  
IG?044Y  
  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"; `Z*k M VN  
DW ^E46k)A  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ITa8*Myj  
s7?Q[vN  
  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; t1,sG8Z  
\e%H5W x  
  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; \vVGfG?6  
zmH8#  
  5、 添加代码,编译运行程序。 kK]JN  
/xmUu0H$R  
三、程序代码 >1[Hk0 <x  
Fa`/i v  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wV- kB4^4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) /79_3;^  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 9*gD;)!  
#if _MSC_VER > 1000 PT7L65  
#pragma once SqL8MKN)  
#endif // _MSC_VER > 1000 9K*yds  
#ifndef __AFXWIN_H__ okx~F9  
#error include 'stdafx.h' before including this file for PCH &CCp@" +  
#endif <4,n6$E  
#include "resource.h" // main symbols >r] bfN,  
class CHookApp : public CWinApp JTw\5j  
{ -EV_=a8[y  
 public: \hpD  
  CHookApp();  GU99!.$  
  // Overrides 6@`Y6>}$_  
  // ClassWizard generated virtual function overrides qk pnXQ  
  //{{AFX_VIRTUAL(CHookApp) 0*S2_&Q)  
 public: @#q>(Ox%  
  virtual BOOL InitInstance(); |A".Mo_5  
  virtual int ExitInstance(); *Z"9QX  
  //}}AFX_VIRTUAL W-9^Ncp  
  //{{AFX_MSG(CHookApp) .,t"i C:E  
  // NOTE - the ClassWizard will add and remove member functions here. bq5tEn  
  // DO NOT EDIT what you see in these blocks of generated code ! &DC o;Ij;  
  //}}AFX_MSG qy1$(3t$  
  DECLARE_MESSAGE_MAP() q.6$-w  
}; @}:}7R6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); nd(O;XBI  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); VkCv`E  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TY[{)aH{S  
BOOL InitHotkey(); V_JM@VN}Kk  
BOOL UnInit(); t0XM#9L  
#endif *i#m5f}  
1<RB}M  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. n5i#GvO^  
#include "stdafx.h" MsMNP[-l  
#include "hook.h" D&q-L[tA@  
#include <windowsx.h>  PDaD:}9  
#ifdef _DEBUG eIjn~2^  
#define new DEBUG_NEW b_xn80O  
#undef THIS_FILE o*7`r~  
static char THIS_FILE[] = __FILE__; Zf~Em'g"3  
#endif gR)T(%W  
#define MAX_KEY 100 YNCQPN\v`1  
#define CTRLBIT 0x04 O-r,&W  
#define ALTBIT 0x02 j_ dCy  
#define SHIFTBIT 0x01 Nq|b$S[4  
#pragma data_seg("shareddata") 6T>e~<^  
HHOOK hHook =NULL; f8um.Xnp6  
UINT nHookCount =0; PzThVeJ+  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey a=*&OW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT #% PnZ /  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey J1kG'cH05  
static int KeyCount =0; )8Defuxk  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift @Y":DHF5q  
#pragma data_seg() Y>*{(QD  
HINSTANCE hins; AL%H$I  
void VerifyWindow(); <`8l8cL  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) =ja(;uC  
//{{AFX_MSG_MAP(CHookApp) tPh``o  
// NOTE - the ClassWizard will add and remove mapping macros here. MM8r*T4g/  
// DO NOT EDIT what you see in these blocks of generated code! }Z5#{Sd  
//}}AFX_MSG_MAP X PnN"Y"y  
END_MESSAGE_MAP() ,B ]kX/W  
W$=MuF7R  
CHookApp::CHookApp() C<Q;3w`#1j  
{ Tl9KL%9  
 // TODO: add construction code here, m'&^\7;D  
 // Place all significant initialization in InitInstance < &[=,R0 @  
} FZTBvdUYp  
{R b|";  
CHookApp theApp; 2aiZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $CXKeWS=Q.  
{ uY+N163i  
 BOOL bProcessed=FALSE; U  JO  
 if(HC_ACTION==nCode) P+r -t8  
 { p3Uus''V4  
  if((lParam&0xc0000000)==0xc0000000){// Key up 71i".1l{K  
   switch(wParam) )*_4=-8H  
   { CCp&P5[67  
    case VK_MENU: m{itMZ@  
     MaskBits&=~ALTBIT; sV{M#UF2  
     break; zb/w^~J_i  
    case VK_CONTROL: (orO=gST-/  
     MaskBits&=~CTRLBIT; X!r9  
     break; |Rk$u  
    case VK_SHIFT: ~Y^ UP  
     MaskBits&=~SHIFTBIT; l!z0lh- J  
     break; X2PQL"`  
    default: //judge the key and send message 86(8p_&zC  
     break; -z%| Jk  
   } wmu#@Hf/[h  
   for(int index=0;index<MAX_KEY;index++){ 3(|8gWQ  
    if(hCallWnd[index]==NULL) 03aa>IO  
     continue; 9 z_9yT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O+U9 p  
    { C]{:>= K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); <a_Q1 l  
     bProcessed=TRUE; Bd8,~8  
    } oW]~\vp^0  
   } ^3*k6h [(  
  } ,1+AfI  
  else if((lParam&0xc000ffff)==1){ //Key down :Z0m "  
   switch(wParam) >% a^;gk(  
   { Wx&gI4~  
    case VK_MENU: L$*sv.  
     MaskBits|=ALTBIT; -DgJkyt+<  
     break; gGl}~  
    case VK_CONTROL: qH(3Z^#.|  
     MaskBits|=CTRLBIT; 871taL=  
     break; :p^7XwX%w  
    case VK_SHIFT: X.V6v4  
     MaskBits|=SHIFTBIT; XBi}hT  
     break; Gb]t%\  
    default: //judge the key and send message C FqteY"  
     break; u Ey>7I  
   } 9Tbi_6[  
   for(int index=0;index<MAX_KEY;index++) F)x^AJi e  
   { ;Js-27_0  
    if(hCallWnd[index]==NULL) fg1_D  
     continue; -ZXC^zt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) x O`#a=  
    { UR;F W`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  'Q\I@s }  
     bProcessed=TRUE; mouLjT&p  
    } pUV3n 1{2  
   } ~Xa8\>  
  } *^cJn*QeL  
  if(!bProcessed){ bnS"@^M  
   for(int index=0;index<MAX_KEY;index++){ e)I-|Q4^%  
    if(hCallWnd[index]==NULL) l_ /q/8-l  
     continue; go^?F- dZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) at_~b Ox6X  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Na8%TT>  
   } sBozz#  
  } DpG|Kl|d  
 } 7;H!F!K]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \%fl`+`  
} EMy Med_  
"/v{B?~%!  
BOOL InitHotkey() ~4HS 2\  
{ |y+<|fb,a  
 if(hHook!=NULL){ 'urn5[i  
  nHookCount++; =?Y%w%2  
  return TRUE; CT1)tRN  
 } A1{ 7g<k6  
 else \bJ,8J1C  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); wm>I;|gA)  
  if(hHook!=NULL) ZuV/!9qU  
   nHookCount++; Qo7]fnnaV  
  return (hHook!=NULL); /ekeU+j  
} }[a  
BOOL UnInit()  c=? =u  
{ %J`cYn#  
 if(nHookCount>1){ L~nVoKY*V  
  nHookCount--; %W!C  
  return TRUE; EC *rd  
 } r=8(n<;Co  
 BOOL unhooked = UnhookWindowsHookEx(hHook); UOTM>d1P  
 if(unhooked==TRUE){ d^5OB8t  
  nHookCount=0; JWHKa=-H  
  hHook=NULL; b65V*Vbj  
 } ZMs$C3  
 return unhooked; $2l<X KT-  
} W-9?|ei  
!KiN} p  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  iC]=S}  
{ FGzMbi<l#(  
 BOOL bAdded=FALSE; 6ybpPls  
 for(int index=0;index<MAX_KEY;index++){ SF?Ublc!   
  if(hCallWnd[index]==0){ [UqJ3@>  
   hCallWnd[index]=hWnd; L`v7|!X  
   HotKey[index]=cKey; *aKT&5Ch-  
   HotKeyMask[index]=cMask; g]B! 29M  
   bAdded=TRUE; p BU,"Yy&  
   KeyCount++; cB~D3a0Th  
   break; lCmTm  
  } SyHS9>  
 } ^{L/) Xy5  
 return bAdded; :xdl I`S  
} [kfLT::mT  
5r#0/1ym!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) EA@p]+P  
{ 7GN>o@t  
 BOOL bRemoved=FALSE; O>P792)  
 for(int index=0;index<MAX_KEY;index++){ 7A!E~/nSC  
  if(hCallWnd[index]==hWnd){ JO\F-xO  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 9b KK  
    hCallWnd[index]=NULL; GjDs,9@f  
    HotKey[index]=0; sC ,[CN:b  
    HotKeyMask[index]=0; =7&2-'(@  
    bRemoved=TRUE; w}*2Hz&Q!  
    KeyCount--; v6r,2Va/  
    break; _M.7%k/U8  
   } !L..I2'  
  } Ko6>h  
 } {.vU;  
 return bRemoved; ~j}7Fre  
} !j"r}c`  
kNW}0CDgs  
void VerifyWindow() U Ke!zI  
{ 3yT7;~vPj  
 for(int i=0;i<MAX_KEY;i++){ /yRP>CX~  
  if(hCallWnd!=NULL){ >hg?!jMjrr  
   if(!IsWindow(hCallWnd)){ t[L0kF9en  
    hCallWnd=NULL; Yvky=RM  
    HotKey=0; :Iy4 B+  
    HotKeyMask=0; eC+S'Jgf  
    KeyCount--; 2"Oj* ;  
   } r*e<`Is  
  } N_#QS}H  
 } OMaG*fb=  
} x'Uv;mGo  
.Y;ljQ  
BOOL CHookApp::InitInstance() 3ya_47D  
{ ZbS* zKEW  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); >]DnEF&  
 hins=AfxGetInstanceHandle(); /5@4}m>Z@  
 InitHotkey(); :Taequk  
 return CWinApp::InitInstance(); 6 w"-&  
} +4<Ij/}p  
zR)9]pJ-  
int CHookApp::ExitInstance() KW&5&~)2  
{ y[ikpp#ozY  
 VerifyWindow(); tS1(.CRk  
 UnInit(); 'q+CL&D  
 return CWinApp::ExitInstance(); 9NX/OctFa'  
} r!DUsE  
VK7lm|J+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file gEFs4; CN  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }E?{M~"<  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ sA( e  
#if _MSC_VER > 1000 y'gIx*6B@  
#pragma once lIs<&-0  
#endif // _MSC_VER > 1000 v.wHj@  
^cQTRO|  
class CCaptureDlg : public CDialog )vO?d~x|  
{ |2oCEb1  
 // Construction 3zV{cm0  
 public: B?;!j)FUtt  
  BOOL bTray; e -sZ_<GH  
  BOOL bRegistered; Wnp\yx`  
  BOOL RegisterHotkey(); V/ a!&_ ""  
  UCHAR cKey; ~,199K#'  
  UCHAR cMask; U _QCe+  
  void DeleteIcon(); I/F3%'O  
  void AddIcon(); ~7$NVKE  
  UINT nCount; XeGtge/}T  
  void SaveBmp(); })zYo 7  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor lwY2zX&%)/  
  // Dialog Data t-, =sV  
  //{{AFX_DATA(CCaptureDlg) }3{ x G+,  
  enum { IDD = IDD_CAPTURE_DIALOG }; )FF3|dZ";K  
  CComboBox m_Key; S"*M9*8  
  BOOL m_bControl; . fZ*N/  
  BOOL m_bAlt; AD_aI %7  
  BOOL m_bShift; !KYX\HRW  
  CString m_Path; ,!m][  
  CString m_Number; K'Gv+UC*6  
  //}}AFX_DATA !N, Oe<  
  // ClassWizard generated virtual function overrides hB]\vA7  
  //{{AFX_VIRTUAL(CCaptureDlg) znNJ?  
 public: *G]zN"Y  
  virtual BOOL PreTranslateMessage(MSG* pMsg); K6C@YY(  
 protected: F;I %9-R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y|NL #F  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8efQ -^b.  
  //}}AFX_VIRTUAL /hNZ7\|P  
  // Implementation @zz4,,]  
 protected: T B!z:n  
  HICON m_hIcon; _[eAA4h  
  // Generated message map functions ;r**`O  
  //{{AFX_MSG(CCaptureDlg) ,-55*Rbi  
  virtual BOOL OnInitDialog(); !|SVRaS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); nhbCk6Y5LZ  
  afx_msg void OnPaint(); n/>^!S  
  afx_msg HCURSOR OnQueryDragIcon(); @k"Q e&BQ  
  virtual void OnCancel(); :Adx7!6  
  afx_msg void OnAbout(); ,};UD  W  
  afx_msg void OnBrowse(); Pz=x$aY  
  afx_msg void OnChange(); U$-;^=;  
 //}}AFX_MSG yA74Rxl*6  
 DECLARE_MESSAGE_MAP() 9GH11B_A  
}; G-5 4D_ 4  
#endif f{m,?[1C,  
Kbdjd p  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file HAkEJgV  
#include "stdafx.h" nE4?oq  
#include "Capture.h" F4Jc7k2  
#include "CaptureDlg.h" x4r=ENO)q  
#include <windowsx.h> V3^=Mj2"  
#pragma comment(lib,"hook.lib") R]s\s[B  
#ifdef _DEBUG N+l 0XjZD9  
#define new DEBUG_NEW # p?7{"Ep  
#undef THIS_FILE qUZm6)p6[a  
static char THIS_FILE[] = __FILE__; \]@XY_21  
#endif UUE:>[,  
#define IDM_SHELL WM_USER+1 c^4^z"Mo`  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ,wyfMOGLt  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X {["4  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; WcG!6.U>  
class CAboutDlg : public CDialog F|rJ{=x  
{ ;q8tOvQ  
 public: s8/sH];  
  CAboutDlg(); gM0^k6bB8  
  // Dialog Data _kgGz@/p  
  //{{AFX_DATA(CAboutDlg) P|:*OM p  
  enum { IDD = IDD_ABOUTBOX }; ~+JE l%  
  //}}AFX_DATA XAn{xN pz  
  // ClassWizard generated virtual function overrides ucVWvXCr  
  //{{AFX_VIRTUAL(CAboutDlg) qIO<\Y l  
 protected: xaM? B7  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o@p(8=x  
  //}}AFX_VIRTUAL PYOU=R%o`8  
  // Implementation zK*zT$<l  
 protected: r-r)'AAO  
  //{{AFX_MSG(CAboutDlg) mnZS](>  
  //}}AFX_MSG TA x9<'  
  DECLARE_MESSAGE_MAP() l'pu?TP{a  
}; SO~]aFoYt  
t *8k3"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) x_C#ALq9  
{ -zzM!1@F  
 //{{AFX_DATA_INIT(CAboutDlg) V_>)m3zsL  
 //}}AFX_DATA_INIT $O+e+Y  
} 0%K/gd#S<  
c*5y8k  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) w6B'&  
{ IQ&o%   
 CDialog::DoDataExchange(pDX); 't3@dz_dG  
 //{{AFX_DATA_MAP(CAboutDlg) 0v~Eu>Rg  
 //}}AFX_DATA_MAP vP_V%5~yN  
} &~%( RO  
n@hf{hA[a  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Fj0a+r,h!  
 //{{AFX_MSG_MAP(CAboutDlg) `]+-z +  
 // No message handlers r`; "  
 //}}AFX_MSG_MAP 01/?  
END_MESSAGE_MAP() 4yk!T  
x/7d!>#;  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @,Re<%\  
: CDialog(CCaptureDlg::IDD, pParent) N@oNg}D&:  
{ dzK]F/L]  
 //{{AFX_DATA_INIT(CCaptureDlg) j:JM v  
  m_bControl = FALSE; sRM3G]nUr  
  m_bAlt = FALSE; ?|&plf |  
  m_bShift = FALSE; \Y EV 5  
  m_Path = _T("c:\\"); \z/_vzz4  
  m_Number = _T("0 picture captured."); A3\%t@y  
  nCount=0; fP6]z y^ *  
  bRegistered=FALSE; &oA p[]  
  bTray=FALSE; |k # ~  
 //}}AFX_DATA_INIT A7/ R5p  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 CdTyUl  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); v Ft]n  
} ~#doJ:^H3  
-y@5% _-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) #^\q Fj  
{ M"E ]r=1  
 CDialog::DoDataExchange(pDX); w""5T|  
 //{{AFX_DATA_MAP(CCaptureDlg) HjX!a29Wf  
  DDX_Control(pDX, IDC_KEY, m_Key); *\UxdL 22  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); w&M)ws;$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1j_x51p  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); rm-6Az V  
  DDX_Text(pDX, IDC_PATH, m_Path); ^G(/;c*=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,P?R 3  
 //}}AFX_DATA_MAP ?89ZnH2/  
} vYYLn9}5  
1pUIZ$@?`  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) !'-|]xx(  
//{{AFX_MSG_MAP(CCaptureDlg) !k=>Wb8n2  
 ON_WM_SYSCOMMAND() ~7N>tjB  
 ON_WM_PAINT() Ik92='Z  
 ON_WM_QUERYDRAGICON() dIOj]5H3F  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) a ]PS`  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) LPg1G+e  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @Ju!|G9z/p  
//}}AFX_MSG_MAP NwK(<dzG  
END_MESSAGE_MAP() )$# Ku2X  
G(4*e! aZ0  
BOOL CCaptureDlg::OnInitDialog() *@M7J  
{ SqiLp!Y`  
 CDialog::OnInitDialog(); /1Xji 0LK  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); L @b8,  
 ASSERT(IDM_ABOUTBOX < 0xF000); 91Cg   
 CMenu* pSysMenu = GetSystemMenu(FALSE); qU'O4TWZ  
 if (pSysMenu != NULL) |_Y[93 1<  
 { &"90pBGK  
  CString strAboutMenu; W6Os|z9&|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); lL*k!lNs  
  if (!strAboutMenu.IsEmpty()) }F*u 9E  
  { '' @upZBJ  
   pSysMenu->AppendMenu(MF_SEPARATOR); 8a\ Pjk  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [5v[Zqud  
  } VW7 ?{EL7  
 } =Yxu {]G  
 SetIcon(m_hIcon, TRUE); // Set big icon ]t69a4&,#9  
 SetIcon(m_hIcon, FALSE); // Set small icon (Ea)`'/  
 m_Key.SetCurSel(0); s}~'o!}W  
 RegisterHotkey(); wYf9&}k\4  
 CMenu* pMenu=GetSystemMenu(FALSE); ++s=$D  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); zH0{S.3 k  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); lC/4CPKtV  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); QE:%uT  
 return TRUE; // return TRUE unless you set the focus to a control Q7ez?]j6  
} aB`x5vg7ho  
k)2L <Lmn  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) n9J.]+@J  
{ qR W WG&  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lgxG:zAC  
 { S?Y,sl+A:  
  CAboutDlg dlgAbout; ~%6GF57gC  
  dlgAbout.DoModal(); Q%xvS,oI  
 } 39W"G7n?v  
 else Q k`yK|(0=  
 { QfI)+pf  
  CDialog::OnSysCommand(nID, lParam); \#bk$R@  
 } 6 u3$ .Q  
} UTatcn  
mkfU fG&  
void CCaptureDlg::OnPaint() %"R|tlG  
{ u&iMY3=  
 if (IsIconic()) # j_<iy  
 { P=)&]Pz  
  CPaintDC dc(this); // device context for painting ^#H%LLt  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); uT5sLpA|6  
  // Center icon in client rectangle UMg*Yv%  
  int cxIcon = GetSystemMetrics(SM_CXICON); t~xp&LQiY  
  int cyIcon = GetSystemMetrics(SM_CYICON); [:HT=LX3  
  CRect rect; ]-o0HY2  
  GetClientRect(&rect); GEg8\  
  int x = (rect.Width() - cxIcon + 1) / 2; ZMSP8(V  
  int y = (rect.Height() - cyIcon + 1) / 2; 0]dL;~0y.  
  // Draw the icon Kvu0Av-7  
  dc.DrawIcon(x, y, m_hIcon); ''9FB5  
 } k1A64?p  
 else a95QDz  
 { J?ljq A}i  
  CDialog::OnPaint(); *siN#,5  
 } 09Sy- je*/  
} r?e)2l~C8j  
a@&^t(1  
HCURSOR CCaptureDlg::OnQueryDragIcon() wvAXt*R  
{ '_z#}P<  
 return (HCURSOR) m_hIcon; 3>[_2}l  
} Z4\$h1tl  
v{ F/Bifo  
void CCaptureDlg::OnCancel() :)GtPTD  
{ 83*"58  
 if(bTray) qg;[~JZYKi  
  DeleteIcon(); */B-%*#I.  
  CDialog::OnCancel(); 8^3Z]=(Q  
} Qrt[MJ+#  
zt1Pu /e  
void CCaptureDlg::OnAbout() O87Ptr8  
{ c k=  
 CAboutDlg dlg; LoHL}1BG-  
 dlg.DoModal(); r)jj]$0  
} _rQM[{Bkg  
u!([m; x|  
void CCaptureDlg::OnBrowse() su~_l[6  
{ 8oI)q4V  
 CString str; Ybr&z7# 2  
 BROWSEINFO bi; +DwyMzeE  
 char name[MAX_PATH]; $ ]/a/!d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Z3K~C_0Cnu  
 bi.hwndOwner=GetSafeHwnd(); lFT_J?G$'  
 bi.pszDisplayName=name; +zpmy3Q  
 bi.lpszTitle="Select folder"; DkP%1Crdr  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; tlU&p'  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); :@6,|2b e=  
 if(idl==NULL) h"S+8Y:1{k  
  return; lx<]v^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X@u-n_  
 str.ReleaseBuffer(); $I%75IZ  
 m_Path=str; Ku{DdiTg>  
 if(str.GetAt(str.GetLength()-1)!='\\') L]o 5=K  
  m_Path+="\\"; sa%2,e'  
 UpdateData(FALSE); utq*<,^  
} C LhD[/Fo  
UE4zmIq  
void CCaptureDlg::SaveBmp() :^mfTj$  
{ $x&\9CRM  
 CDC dc; |BD]K0  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); X!0s__IOc  
 CBitmap bm; hB#z8D  
 int Width=GetSystemMetrics(SM_CXSCREEN); Z6<vLc  
 int Height=GetSystemMetrics(SM_CYSCREEN); |okS7.|IX  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,c:Fa)-  
 CDC tdc; 0z g\thL  
 tdc.CreateCompatibleDC(&dc); '|r('CIBN/  
 CBitmap*pOld=tdc.SelectObject(&bm); CqVh9M.ah  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); PjEKZHHz  
 tdc.SelectObject(pOld); ]XEkQ  
 BITMAP btm; &Y2mLPB  
 bm.GetBitmap(&btm); GI}h )T  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pPcn F`A  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <!h&h  
 BITMAPINFOHEADER bih; bdiyS.a-  
 bih.biBitCount=btm.bmBitsPixel; NJb5HoYZ  
 bih.biClrImportant=0; `jR;RczC  
 bih.biClrUsed=0; N{@kgc  
 bih.biCompression=0; ^Bihm] Aq  
 bih.biHeight=btm.bmHeight; `F:PWG`  
 bih.biPlanes=1; 8S1%;@c  
 bih.biSize=sizeof(BITMAPINFOHEADER); %gB 0\C  
 bih.biSizeImage=size; Z']D8>d  
 bih.biWidth=btm.bmWidth; YcS }ug7  
 bih.biXPelsPerMeter=0; }Y(yDg;"  
 bih.biYPelsPerMeter=0; 3Q^@ !hu  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ?^9TtxM  
 static int filecount=0; 1!. CfQi  
 CString name; 8Ua ;< h%  
 name.Format("pict%04d.bmp",filecount++); Do}mCv  
 name=m_Path+name; S5ofe]tS@  
 BITMAPFILEHEADER bfh; ^+:_S9qst  
 bfh.bfReserved1=bfh.bfReserved2=0; 9 |Iq&S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); { U a19~'>  
 bfh.bfSize=54+size; MjMPbGUX{  
 bfh.bfOffBits=54; K#g)t/SZ  
 CFile bf; JcxhI]E  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ <,,U>0?3  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .IYE+XzV  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); -`6O(he  
  bf.WriteHuge(lpData,size); <Tr_,Ya{9  
  bf.Close(); 7~[1%`  
  nCount++; iq`y  
 } zzfwI@4  
 GlobalFreePtr(lpData); f<ABs4w  
 if(nCount==1) IEV3(qzt  
  m_Number.Format("%d picture captured.",nCount); 4.bL>Y>c  
 else H".~@,-}  
  m_Number.Format("%d pictures captured.",nCount); e!}R1  
  UpdateData(FALSE); <{.o+~k  
} ;p%a!Im_ <  
}et^'BkA(  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 'sI=*c  
{ d [z+/L  
 if(pMsg -> message == WM_KEYDOWN) z#b31;A@$  
 { _Tyj4t0ElV  
  if(pMsg -> wParam == VK_ESCAPE) 8"+Re [  
   return TRUE; M?5[#0"&V  
  if(pMsg -> wParam == VK_RETURN) c$ Kn.<a  
   return TRUE; Qh-k[w0  
 } 9I/o;Js  
 return CDialog::PreTranslateMessage(pMsg); s%`o  
} Rxld$@~-(]  
ZWW:-3  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Y'kD_T`f,  
{ + oyW_!(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ D .| h0gU  
  SaveBmp(); $H^hK0?'  
  return FALSE; m*h d%1D  
} NG@9 }O  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o Wg5-pMWZ  
 CMenu pop; zEJ|;oL  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); r'fNQJ >  
 CMenu*pMenu=pop.GetSubMenu(0); N4"%!.Y  
 pMenu->SetDefaultItem(ID_EXITICON); !8ub3oj)  
 CPoint pt; =!r9;L,?  
 GetCursorPos(&pt); $@q)IK%FDL  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +\9Y;N y  
 if(id==ID_EXITICON) 5B| iBS l  
  DeleteIcon(); Gs2.}l z  
 else if(id==ID_EXIT) nK Rx_D$d  
  OnCancel(); yB(^t`)}N  
 return FALSE; ]c8lZO>  
} 0Z#&!xTb  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); (`gqLPx[  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ;ej;<7+  
 AddIcon(); vBQ|h  
 return res; nGGYKI  
} h,<%cvU=  
i Nf+ -C3  
void CCaptureDlg::AddIcon() J=W"FEXTL7  
{ a;m-Vu!  
 NOTIFYICONDATA data; &| el8;D  
 data.cbSize=sizeof(NOTIFYICONDATA); HKx2QFB  
 CString tip; R<)7,i`F  
 tip.LoadString(IDS_ICONTIP); +Ck<tx3h&  
 data.hIcon=GetIcon(0); GWRKiTu9  
 data.hWnd=GetSafeHwnd(); 6w<jg/5t  
 strcpy(data.szTip,tip); NMmk,  
 data.uCallbackMessage=IDM_SHELL; % w 6fB  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Ph2jj,K  
 data.uID=98; k2N[B(&4J  
 Shell_NotifyIcon(NIM_ADD,&data); I(ds]E ;_E  
 ShowWindow(SW_HIDE); Z6SM7? d  
 bTray=TRUE; z^S=ji U++  
} ;id0|x  
)Z0pU\  
void CCaptureDlg::DeleteIcon()  V3K  
{ Ab -uK|<  
 NOTIFYICONDATA data; om$)8'A,l  
 data.cbSize=sizeof(NOTIFYICONDATA); "#d}S)GlXM  
 data.hWnd=GetSafeHwnd(); I :%(nKBK  
 data.uID=98; '~%1p_0dq  
 Shell_NotifyIcon(NIM_DELETE,&data); ^.Vq0Qzy]  
 ShowWindow(SW_SHOW); z+&mMP`-  
 SetForegroundWindow(); ?n>h/[/  
 ShowWindow(SW_SHOWNORMAL); !HM{imT  
 bTray=FALSE; i3s-l8\\z  
} FSd842O  
8.Wf^j$+{  
void CCaptureDlg::OnChange() YmFJlMK  
{ }'a}s0h  
 RegisterHotkey(); Z ) qc-~S  
} h djv/  
bTE%p0  
BOOL CCaptureDlg::RegisterHotkey() -?' r_t  
{ Y<%$;fx$Sx  
 UpdateData(); i1ur>4Ns  
 UCHAR mask=0; " GkBX  
 UCHAR key=0; ^KhA\MzY  
 if(m_bControl) wz31e!/  
  mask|=4; 6",1JH,;p  
 if(m_bAlt) bcC ;i~9  
  mask|=2; `gfh]7T  
 if(m_bShift) #, W7N_mt  
  mask|=1; 6<.Ma7)lA  
  key=Key_Table[m_Key.GetCurSel()]; $0V<wsVM  
 if(bRegistered){ *xA&t)z(i  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); R @b[o7/  
  bRegistered=FALSE; WE 'afxgV  
 } ZJ'#XZpr  
 cMask=mask; Eic/#j{4  
 cKey=key; ko*Ir@SDv  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U-#wFc2N  
 return bRegistered; I0.{OJ-  
} 7NV1w*> /  
L|EvI.f  
  四、小结 4!,x3H'  
O8"kIDr-  
  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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