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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: n9Ktn}  
  DpIk$X  
  一、实现方法 a6'T]DW0W  
vk<4P;A(G  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: cHon' tS  
6|Xm8,]yRw  
#pragma data_seg("shareddata") }'4aW_ta  
HHOOK hHook =NULL; //钩子句柄 ~b})=7n.  
UINT nHookCount =0; //挂接的程序数目 ztC>*SX  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9'A^n~JHF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 [_HOD^  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey kyL]4:@W`  
static int KeyCount =0; O+=C8  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 > QK"r7f/  
#pragma data_seg() ?&bB?mg\  
 g:?p/L  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 _+d*ljP)l3  
Jp(CBCG{F  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: MS& 'Nj  
Asli<L(?`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR }^azj>p5  
cKey,UCHAR cMask) 1SG^X-(GM/  
{ :`Xg0J+P  
 BOOL bAdded=FALSE; |H;+9(  
 for(int index=0;index<MAX_KEY;index++){ 4S*dNYc  
  if(hCallWnd[index]==0){ "]B%V!@  
   hCallWnd[index]=hWnd; Jm-bE 8b  
   HotKey[index]=cKey; ?pV!`vp^{  
   HotKeyMask[index]=cMask; yUvn h  
   bAdded=TRUE; !JbWxGN`jn  
   KeyCount++; -_irkpdC[  
   break; qP72JxT  
  } x<=R?4@rq  
 } I~ e,']  
 return bAdded; B>%;"OMp  
} sfs2kiH  
//删除热键 ^=y%s  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8UXtIuQ  
{ "B0I$`~wu  
 BOOL bRemoved=FALSE; HJ;!'@  
 for(int index=0;index<MAX_KEY;index++){ n4o}}tI  
  if(hCallWnd[index]==hWnd){ MGsY3~!K  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S&NWZ:E3[  
    hCallWnd[index]=NULL; newURb,-!  
    HotKey[index]=0; &e99P{\D  
    HotKeyMask[index]=0; _z53r+A  
    bRemoved=TRUE; j7b4wH\#  
    KeyCount--; rV B\\  
    break; )F4BVPI  
   } Y, {pG]B$w  
  } ZC3;QKw>  
 } !_>o2  
 return bRemoved; mJ+mTA5bW  
} =}2k+v-B  
@j=rS S  
/.Jq]"   
  DLL中的钩子函数如下: j>#ywh*A  
6!v$"u|[!'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vAfYONU  
{ eDsc_5I  
 BOOL bProcessed=FALSE; 0+Q; a  
 if(HC_ACTION==nCode) =21m|8c  
 { u|75r%p>  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 t"X^|!hKIF  
   switch(wParam) 0}WDB_L  
   {  7|(o=+Bt  
    case VK_MENU: !wH'dsriD  
     MaskBits&=~ALTBIT; om8`^P/b  
     break; b&*N  
    case VK_CONTROL: JwdvY]  
     MaskBits&=~CTRLBIT; &)!4rABn  
     break; _J>!K'Dz  
    case VK_SHIFT: UHX,s  
     MaskBits&=~SHIFTBIT; a=M/0N{!  
     break; )jm!^m  
    default: //judge the key and send message z~#d@c\  
     break; 9]QHwa>_|2  
   } K1zH\wH  
   for(int index=0;index<MAX_KEY;index++){ q:9CFAX0=  
    if(hCallWnd[index]==NULL) .yQ<  
     continue; EKNmXt1 lE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N[;R8S P  
    { E6fs&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6\xfoy|j  
     bProcessed=TRUE; S.!K  
    } jz,Gj}3;  
   } 8JU{]Z!G<;  
  } wLy:S.r  
  else if((lParam&0xc000ffff)==1){ //有键按下 ];\XA;aOl}  
   switch(wParam) =" pNE#  
   { #&ayWef  
    case VK_MENU: pV/5w<_x?  
     MaskBits|=ALTBIT; `IJTO_  
     break; 6yd?xeD  
    case VK_CONTROL: vPD%5 AJN  
     MaskBits|=CTRLBIT; `+@r0:G&v  
     break; >)VWXv0  
    case VK_SHIFT: CQH^VTQ  
     MaskBits|=SHIFTBIT; .qrS[ w  
     break; G' mg-{  
    default: //judge the key and send message na_Wp^;  
     break; t""d^a#Dp  
   } yv\ j&B|  
   for(int index=0;index<MAX_KEY;index++){ \6;b.&%w2  
    if(hCallWnd[index]==NULL) %XH%.Ps/  
     continue; I$*LMzve  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G!7A]s>C  
    { 4{LKT^(!f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~9c jc  
     bProcessed=TRUE; :"`1}Q  
    } VlS`m,:{  
   } R{q<V uN  
  } wQojmmQ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D;6C2>U~L  
   for(int index=0;index<MAX_KEY;index++){  ](>YjE0  
    if(hCallWnd[index]==NULL) gQuU_dbXSB  
     continue; (8Te{Kh'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) zin'&G>l  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); pd.5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 g:Fo7*i  
   } 5EL&?\e  
  } Vw5Pgtx  
 } Dw.Pv)'$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \!wo<UX%  
} iw I}  
3W}qNY;J  
  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: BKQwF *<V  
8$38>cGY^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lVgin54Q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); UH#S |o4  
n_4BNOZ~  
  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: F **/T  
nKe|xP  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) D:PrFa  
{ M>u84|`  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 1HUe8m[#3  
 { yXBWu=w3`O  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 RSIhZYA  
  SaveBmp(); tD6ukK1x  
  return FALSE; $"fO/8Ex  
 } j){0>O.V  
 …… //其它处理及默认处理 pf#~|n#t  
} s"(F({J  
D'Uv7Mis  
Z._%T$8aJv  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 `/9&o;qM   
4v.i!U# {  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 +HoCG;C{  
bM"d$tl$?'  
  二、编程步骤 ;Ngu(es6  
L<p.2[3  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; >z k6{kC  
wPaMYxO/  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \{ff7_mLo  
l|fb;Giq=D  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; vxXrVPU3  
CW?R7A/  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; J1Oe`my  
}a!c  
  5、 添加代码,编译运行程序。 M)CQ|P  
o^+g2;Ro  
三、程序代码 \hZye20  
d%#5roR4<  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL `]5t'Ps  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3($tD*!o  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,b74 m  
#if _MSC_VER > 1000 )u.%ycfeV  
#pragma once p s_o:*$l  
#endif // _MSC_VER > 1000 6&6t=  
#ifndef __AFXWIN_H__ eV(   
#error include 'stdafx.h' before including this file for PCH 7$7#z\VWu  
#endif #=czqZw  
#include "resource.h" // main symbols h{?cs%lZ  
class CHookApp : public CWinApp @Mf ZP~T+  
{ 8-FW'bA  
 public: b21@iW  
  CHookApp(); &cT@MV5  
  // Overrides %!OA/7XbG  
  // ClassWizard generated virtual function overrides +]0/:\(B  
  //{{AFX_VIRTUAL(CHookApp) sYd)r%%AU  
 public: Dj'+,{7,u  
  virtual BOOL InitInstance(); O{wt0 \P  
  virtual int ExitInstance(); Pk )H(,  
  //}}AFX_VIRTUAL 077 wk  
  //{{AFX_MSG(CHookApp) YeVkX{y  
  // NOTE - the ClassWizard will add and remove member functions here. >?r8D48`  
  // DO NOT EDIT what you see in these blocks of generated code ! $uYfy<  
  //}}AFX_MSG 0[7tJbN  
  DECLARE_MESSAGE_MAP() !^qpV7./l  
}; lnt}l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #BhcW"@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U] av{}U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); M6z$*? <  
BOOL InitHotkey(); G>S3?jGk  
BOOL UnInit(); nOq`Cwh9  
#endif PbY=?>0z  
\Z$MH`_nu  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. NkYC(;g  
#include "stdafx.h" ?pkGejcQ  
#include "hook.h" xQ>T.nP}1  
#include <windowsx.h> XWBTBL  
#ifdef _DEBUG 4[ =C,5r  
#define new DEBUG_NEW ^%}PRl9  
#undef THIS_FILE G(MLq"R6U  
static char THIS_FILE[] = __FILE__; R;H>#caJ  
#endif ApqNV  
#define MAX_KEY 100 diD[/&k#kh  
#define CTRLBIT 0x04 @hOT< Uo  
#define ALTBIT 0x02 mxmj  
#define SHIFTBIT 0x01 52'0l>  
#pragma data_seg("shareddata") g!!:o(k  
HHOOK hHook =NULL; JjnWv7W3$  
UINT nHookCount =0; k:*vD"  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey gi<%: [jT  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT <Eh_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey WU{9lL=  
static int KeyCount =0; |/~ISB  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift pU[5f5_  
#pragma data_seg() 3(=QY)  
HINSTANCE hins; jDCf]NvOPM  
void VerifyWindow(); $B?IE#7S4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) `WlQ<QEi  
//{{AFX_MSG_MAP(CHookApp) ]DLs'W;)  
// NOTE - the ClassWizard will add and remove mapping macros here. h[r)HX0hA  
// DO NOT EDIT what you see in these blocks of generated code! /e]R0NI  
//}}AFX_MSG_MAP :;N2hnHoG  
END_MESSAGE_MAP() V7$-4%NL  
c!J|vRA5  
CHookApp::CHookApp() -Rj3cx  
{ F tay8m@f  
 // TODO: add construction code here, k5eTfaxl  
 // Place all significant initialization in InitInstance -5<G^AS  
} ?T_bjALW  
+"JQ5~7  
CHookApp theApp; 8W}rS v+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Hzojv<c  
{ IS%e5  
 BOOL bProcessed=FALSE;  K<?[^\  
 if(HC_ACTION==nCode) =$WDB=i  
 { 7x)32f"  
  if((lParam&0xc0000000)==0xc0000000){// Key up X oh@(%  
   switch(wParam) $fQ'q3  
   { =7Sw29u<  
    case VK_MENU: k;pU8y6Y  
     MaskBits&=~ALTBIT; {/K!cPp9  
     break; Dj x[3['  
    case VK_CONTROL:  #-K,,"  
     MaskBits&=~CTRLBIT; s+&iH  
     break; vze|*dKS  
    case VK_SHIFT: 6yhRcvJ}  
     MaskBits&=~SHIFTBIT; `{'h+v`  
     break; *2r(!fJP=^  
    default: //judge the key and send message tS6r4d%~=  
     break; aIklAj)=  
   } Rj~y#m  
   for(int index=0;index<MAX_KEY;index++){ jP"yG#  
    if(hCallWnd[index]==NULL) Zl{ DqC^  
     continue; t[X,m]SX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sbjc8V ut  
    { PAs.T4Av^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); R6qC0@*  
     bProcessed=TRUE; BaOPtBYA:  
    } 1JF>0ijU@  
   } %oiA'hz;*  
  } SaiYdJ  
  else if((lParam&0xc000ffff)==1){ //Key down s^ K:cz  
   switch(wParam) J9XV:)Yv#  
   { c}D>.x|]  
    case VK_MENU: yvV]|B@sO  
     MaskBits|=ALTBIT; 1L<X+,]@  
     break; G33'Cgo:,  
    case VK_CONTROL: !E_RD,_  
     MaskBits|=CTRLBIT; gbN@EJ  
     break; \zV'YeG  
    case VK_SHIFT: T#D*B]oZ}  
     MaskBits|=SHIFTBIT; ;N!W|G  
     break; ki9vJ<  
    default: //judge the key and send message NA9ss  
     break; J|N>}di  
   } HOlMj!.  
   for(int index=0;index<MAX_KEY;index++) 4nGr?%>  
   { zH1ChgF=}  
    if(hCallWnd[index]==NULL) 95 oh}c  
     continue; d6{0[T^L  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) y\}<N6  
    { l#;o^H i  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @rxfOc0J#  
     bProcessed=TRUE; r9$7P?zm  
    } 8AIAv_ g  
   } .:2=VLujU  
  } JbW!V Y  
  if(!bProcessed){ .$s=E8fW  
   for(int index=0;index<MAX_KEY;index++){ 6x"|,,&MD0  
    if(hCallWnd[index]==NULL) $jL+15^N0+  
     continue; 0A.9<&Lod  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o3>D~9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); CUa`#  
   } 6cbIs_ g  
  } a~O](/+p;  
 } E]%&)3O[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fg~9{1B  
} q%c"`u/v/  
X1\ao[t<;c  
BOOL InitHotkey() GM>Ms!Y  
{ cK6IyJx-  
 if(hHook!=NULL){ 1iIag}?p  
  nHookCount++; Q)l~?Fx  
  return TRUE; 6Z68n  
 } d> L*2 g  
 else }ygxmb^@Z  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~{BR~\D  
  if(hHook!=NULL) s&Ml1 A:  
   nHookCount++; <" F|K!Tz  
  return (hHook!=NULL); Ol1P  
} >}>cJh6  
BOOL UnInit() L Olj8T8Z  
{ >;OwBzB  
 if(nHookCount>1){ pQOT\- bD  
  nHookCount--;  hPgDK.R'  
  return TRUE; a$h zG-  
 } jGKasI`  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $ Y_v X 2  
 if(unhooked==TRUE){ ulxy 4] h  
  nHookCount=0; *OMW" NZ;  
  hHook=NULL; 1[H1l;  
 } EPL"H:o5%<  
 return unhooked; iV8O<en&i  
} <[<]+r&*  
\z)` pno  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~h6aTN  
{ $sBje*;  
 BOOL bAdded=FALSE; yZ57uz  
 for(int index=0;index<MAX_KEY;index++){ lO5*n|Ic,  
  if(hCallWnd[index]==0){ D-4\AzIb  
   hCallWnd[index]=hWnd; Vh;P,no#  
   HotKey[index]=cKey; ">NPp\t>/Z  
   HotKeyMask[index]=cMask; g)#.|d+  
   bAdded=TRUE; ,.PmH.zjmR  
   KeyCount++; ?ZlN$h^  
   break; CAV Q[r5y  
  } _#rE6./@q  
 } ^ G@o} Z  
 return bAdded; ZsepTtY  
} f1}b;JJTsv  
#\r5Q>  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) XoqmT/P  
{ ;c~%:|  
 BOOL bRemoved=FALSE; \' ;zD-MX  
 for(int index=0;index<MAX_KEY;index++){ GJIM^  
  if(hCallWnd[index]==hWnd){ 0I \l_St@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ TNK~ETE4  
    hCallWnd[index]=NULL; o? {rPFR  
    HotKey[index]=0; pxi/ ]6pw  
    HotKeyMask[index]=0; E HY}gG)  
    bRemoved=TRUE; @8s:,Y_  
    KeyCount--; `#w`-  
    break; g$$j:U*-  
   } {[Vkht}  
  } + c"$-Jr  
 } }_"<2|~_  
 return bRemoved; l Vc':,z  
} 0R[onPU_vZ  
)k'4]=d <  
void VerifyWindow() @F,8M  
{ gg%9EJpP  
 for(int i=0;i<MAX_KEY;i++){ 'Xw> ?[BB  
  if(hCallWnd!=NULL){ 1>e%(k2w%  
   if(!IsWindow(hCallWnd)){ UO{3v ry48  
    hCallWnd=NULL; 64h$sC0z/e  
    HotKey=0; }iCcXZ&5^  
    HotKeyMask=0; A*_ |/o  
    KeyCount--; )+xHv  
   } lH8e?zJ  
  } 8{ iFxTz  
 } { WW!P,w  
} 3D/<R|p  
FR9*WI   
BOOL CHookApp::InitInstance() U6Ws#e  
{ #_}r)q  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); o?\v 8.n  
 hins=AfxGetInstanceHandle(); &*3O+$L  
 InitHotkey(); FeAMt  
 return CWinApp::InitInstance(); =h se2f  
} KOM]7%ys1H  
Fi*j}4F1  
int CHookApp::ExitInstance() H(k-jAO,  
{ bEc @"^)  
 VerifyWindow(); r%DaBx!x8  
 UnInit(); ;]+p>p-#  
 return CWinApp::ExitInstance(); V]I+>Zn| 7  
} ??tNMr5{[  
K$(LiP  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file E A8>{}Z*  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) L-v-KO6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c (Gl3^  
#if _MSC_VER > 1000 Q!_@Am"h  
#pragma once mfpL?N  
#endif // _MSC_VER > 1000 _wMYA8n  
rxVJB3P9  
class CCaptureDlg : public CDialog W n43TSs-  
{ a="\?L5  
 // Construction q VcZF7  
 public: f-b#F2I  
  BOOL bTray; Kc[Y .CH  
  BOOL bRegistered; #(KE9h%  
  BOOL RegisterHotkey(); ij/5m-{6)  
  UCHAR cKey; P:8P>#L  
  UCHAR cMask; HD& Ag  
  void DeleteIcon(); d|c> Y(  
  void AddIcon();  @rT}V>2I  
  UINT nCount; vx&jI$t8  
  void SaveBmp(); A(#4$}!n5  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5o dtYI%L  
  // Dialog Data wmf#3"n  
  //{{AFX_DATA(CCaptureDlg) ?()$imb*  
  enum { IDD = IDD_CAPTURE_DIALOG }; M~/R1\'&j  
  CComboBox m_Key; ,\cO>y@  
  BOOL m_bControl; `aw5"ns^V  
  BOOL m_bAlt; YPY'[j(p`n  
  BOOL m_bShift; _g#v*7o2@  
  CString m_Path; ~^u#Q\KE"  
  CString m_Number; JIobs*e0m  
  //}}AFX_DATA x\m?*5p  
  // ClassWizard generated virtual function overrides r-+S^mOE]  
  //{{AFX_VIRTUAL(CCaptureDlg) 9/x_p;bI  
 public: N=X(G(  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 7Odw{pc  
 protected: %ut7T!Jp  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qr~= S  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); MJ+]\(  
  //}}AFX_VIRTUAL KASw3!.W  
  // Implementation yj+HU5L4  
 protected: (GNY::3  
  HICON m_hIcon; R#QcQx  
  // Generated message map functions WO=,NQOw  
  //{{AFX_MSG(CCaptureDlg) LBkAi(0rd  
  virtual BOOL OnInitDialog(); Vg+jF!\7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); iKu~o.yy  
  afx_msg void OnPaint();  @aC2]  
  afx_msg HCURSOR OnQueryDragIcon(); [x.Dw U%S  
  virtual void OnCancel(); &oyj8  
  afx_msg void OnAbout(); sb7~sa&-  
  afx_msg void OnBrowse(); a.5^zq7#!  
  afx_msg void OnChange(); ~YX!49XfHh  
 //}}AFX_MSG &xGcxFd  
 DECLARE_MESSAGE_MAP() Q41eYzAi  
}; a &89K  
#endif BVt)~HZ  
uWSfr(loX  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file /`j~r;S  
#include "stdafx.h" eT|"6WJ:{  
#include "Capture.h" 9se ,c  
#include "CaptureDlg.h" 6*:mc  
#include <windowsx.h> \?9{H6<=  
#pragma comment(lib,"hook.lib") 6UkX?I`>  
#ifdef _DEBUG sP+ZE>7  
#define new DEBUG_NEW FojsI<  
#undef THIS_FILE # [0>wEq  
static char THIS_FILE[] = __FILE__; v^;%Fz_Dr  
#endif ~e)`D nJ  
#define IDM_SHELL WM_USER+1 50S >`qi2x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); {U,q!<@mq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5l&9BS&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; %Z"I=;=nxI  
class CAboutDlg : public CDialog #CaT0#v  
{ y_=},a  
 public: u\JYxNj1  
  CAboutDlg(); MJ )aY2  
  // Dialog Data u{-J?t&`  
  //{{AFX_DATA(CAboutDlg) YlY3C  
  enum { IDD = IDD_ABOUTBOX }; kh'R/Dt  
  //}}AFX_DATA ua^gG3n0  
  // ClassWizard generated virtual function overrides . >{.!a  
  //{{AFX_VIRTUAL(CAboutDlg) 7Qc 4Oz:t  
 protected: !M[a/7x,p  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support *UJ&9rQ  
  //}}AFX_VIRTUAL 5ecAev^1-  
  // Implementation TZ]D6.mD  
 protected: }4; \sY  
  //{{AFX_MSG(CAboutDlg) e"sz jY~V  
  //}}AFX_MSG cS'|c06  
  DECLARE_MESSAGE_MAP() Yzr|Z7r q}  
}; KH<f=?b  
yE\dv)(<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) >c~ Fg s  
{ lAM"l)Ij  
 //{{AFX_DATA_INIT(CAboutDlg) YMSA[hm  
 //}}AFX_DATA_INIT wd/"! A4(  
} 5GP,J,J  
h zh%ML3L  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) %:P&! F\?  
{ ]y3'6!  
 CDialog::DoDataExchange(pDX); 6uU2+I  
 //{{AFX_DATA_MAP(CAboutDlg) TzCNY@y  
 //}}AFX_DATA_MAP m),3J4(q  
} Ny.s u?E  
F`3J=AJOJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) L0Fhjbc  
 //{{AFX_MSG_MAP(CAboutDlg) (oYM}#Q  
 // No message handlers Z5vpo$l  
 //}}AFX_MSG_MAP YB}p`b42L  
END_MESSAGE_MAP() ]Y%?kQ^  
6n 2LG  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~ [por  
: CDialog(CCaptureDlg::IDD, pParent) er0hf2N]  
{ O%(E 6 n  
 //{{AFX_DATA_INIT(CCaptureDlg) q x1}e  
  m_bControl = FALSE; M=57 d7  
  m_bAlt = FALSE; "0lC:Wu]  
  m_bShift = FALSE; 1w)#BYc=L  
  m_Path = _T("c:\\"); N* C"+2  
  m_Number = _T("0 picture captured."); kc3dWWPe  
  nCount=0; Puu O2TZ  
  bRegistered=FALSE; =]OG5b_-Y  
  bTray=FALSE; !Ol>![  
 //}}AFX_DATA_INIT @ y (9LSs  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6<h?%j(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); v\Y362Xv  
} 6%K,3R-d  
* 7ki$f!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) &J\V !uVo  
{ -N')LY  
 CDialog::DoDataExchange(pDX); l>i<J1  
 //{{AFX_DATA_MAP(CCaptureDlg) BCE} Er&  
  DDX_Control(pDX, IDC_KEY, m_Key); i#@3\&{J>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); v.08,P{b  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Y6|8;2E  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); p~T)Af<(  
  DDX_Text(pDX, IDC_PATH, m_Path); Vp;^_,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *g}(qjl<  
 //}}AFX_DATA_MAP X0=#e54  
} ;OlC^\e  
2Mc}>UI?eO  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ::\7s  
//{{AFX_MSG_MAP(CCaptureDlg) (W<n<sl:-  
 ON_WM_SYSCOMMAND() p+O 2 :  
 ON_WM_PAINT() 6wzTX8  
 ON_WM_QUERYDRAGICON() X]?qns7  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !,mv 7Yj  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse)  1k5o?'3&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) YGBVGpE9  
//}}AFX_MSG_MAP 3w=OvafT:  
END_MESSAGE_MAP() 7R 40t3  
tFvc~zz9  
BOOL CCaptureDlg::OnInitDialog() A~CQ@  
{ , qj  
 CDialog::OnInitDialog(); 3H0~?z_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 9Bl c  
 ASSERT(IDM_ABOUTBOX < 0xF000); IH;+pN  
 CMenu* pSysMenu = GetSystemMenu(FALSE); AXV+8$ :R  
 if (pSysMenu != NULL) -Mb`I >=  
 { z@lUaMm:F  
  CString strAboutMenu; !BN7 B  
  strAboutMenu.LoadString(IDS_ABOUTBOX); A9_)}  
  if (!strAboutMenu.IsEmpty()) 3Z *'  
  { ;:JTb2xbb  
   pSysMenu->AppendMenu(MF_SEPARATOR); SArSi6vF  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 5I!EsW$sY  
  } vHY."$|H  
 } 6.z8!4fpl  
 SetIcon(m_hIcon, TRUE); // Set big icon ]j.??'+rg  
 SetIcon(m_hIcon, FALSE); // Set small icon \0'7p-T6  
 m_Key.SetCurSel(0); sLE@Cm]k  
 RegisterHotkey(); *&b~cyC  
 CMenu* pMenu=GetSystemMenu(FALSE); "y_A xOH  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); &;~x{q]3  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); x[Xj[O  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); b(lC7Xm  
 return TRUE; // return TRUE unless you set the focus to a control C3Mr)  
} 5B [kZ?>  
$z-zscco  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) *5DOTWos  
{ f)xHSF"  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ORPQ1%tu  
 { ^^[MDjNy@  
  CAboutDlg dlgAbout; KGCm@oy  
  dlgAbout.DoModal(); 2TN+ (B#Z!  
 } i^[yGXtW  
 else ,Db+c3  
 { DP=4<ES%+  
  CDialog::OnSysCommand(nID, lParam); n3, ?klK  
 } D2$"!7O1H  
} 'Ldlo+*|5  
8~QEJW$  
void CCaptureDlg::OnPaint() #P,mZ}G\  
{ BJgg-z{Y  
 if (IsIconic()) IS; F9{  
 { ;dt&* ]wA  
  CPaintDC dc(this); // device context for painting _y Q*  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); o(iN}.c  
  // Center icon in client rectangle X G fLi  
  int cxIcon = GetSystemMetrics(SM_CXICON); $:I~y| !1  
  int cyIcon = GetSystemMetrics(SM_CYICON); @D!KFJ  
  CRect rect; d($f8{~W  
  GetClientRect(&rect); V 0Ul`  
  int x = (rect.Width() - cxIcon + 1) / 2; Ol4 )*/oZ  
  int y = (rect.Height() - cyIcon + 1) / 2; mmrx*sr=  
  // Draw the icon =W1`FbR  
  dc.DrawIcon(x, y, m_hIcon); #un#~s 7Q  
 } gn&jNuGg  
 else @Oe!*|?mS  
 { #4. S2m4  
  CDialog::OnPaint(); $O*rxQ}  
 } 2| u'J  
} 9/OB!<*V|  
krkRP%jy  
HCURSOR CCaptureDlg::OnQueryDragIcon() dQ97O{O:i  
{ !br0s(|  
 return (HCURSOR) m_hIcon; ?MevPy`H  
} >W,1s  
k'uN2m  
void CCaptureDlg::OnCancel() 4&IBNc,sn  
{ _5I" %E;S  
 if(bTray) "x&hBJ  
  DeleteIcon(); e-;$Iv  
  CDialog::OnCancel(); 7<V(lX.{  
} Ic 4>kKh  
m|<j9.iJ  
void CCaptureDlg::OnAbout() jIx5_lFe  
{ cT abZc  
 CAboutDlg dlg; * iW>i^  
 dlg.DoModal(); 45l/)=@@B  
} 4C2JyP3  
9.R)iA  
void CCaptureDlg::OnBrowse() T"Ph@I<  
{ $\>GQ~k  
 CString str; nA%H`/O{  
 BROWSEINFO bi; Q7O8']~n  
 char name[MAX_PATH];  ?C   
 ZeroMemory(&bi,sizeof(BROWSEINFO)); N%{&%C6{  
 bi.hwndOwner=GetSafeHwnd(); vS %r_gf(  
 bi.pszDisplayName=name; ;L.@4b[lP  
 bi.lpszTitle="Select folder"; bq3G3oAyG  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; :UmY|=v?t  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ye1kI~LO(  
 if(idl==NULL) L 0k K'n?  
  return; !n4p*<Y6  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); kQXtO)  
 str.ReleaseBuffer(); gio'_X  
 m_Path=str; 3IHya=qN  
 if(str.GetAt(str.GetLength()-1)!='\\') Wd'wL"6De  
  m_Path+="\\"; o >bf7+D  
 UpdateData(FALSE); Eh;SH^&6  
} }0c  
 Ex35  
void CCaptureDlg::SaveBmp() Wbc*x  
{ xe[Cuy$P  
 CDC dc; *Got  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); e$|g  
 CBitmap bm; ) 'x4#5]  
 int Width=GetSystemMetrics(SM_CXSCREEN); %7q,[g8  
 int Height=GetSystemMetrics(SM_CYSCREEN); AZcW f8  
 bm.CreateCompatibleBitmap(&dc,Width,Height); T'2(sHk  
 CDC tdc; 3X,9K23T  
 tdc.CreateCompatibleDC(&dc); H)1< ;{:  
 CBitmap*pOld=tdc.SelectObject(&bm); xfw)0S  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); S2/c2  
 tdc.SelectObject(pOld); |S#)[83*3  
 BITMAP btm; O G#By6O  
 bm.GetBitmap(&btm); DzX5_ kA  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; c,;-[sn  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); z-nhL=  
 BITMAPINFOHEADER bih; S5]rIcM  
 bih.biBitCount=btm.bmBitsPixel; s<x2*yVUA  
 bih.biClrImportant=0; ?}y?e}y*xZ  
 bih.biClrUsed=0; <N^2|*3  
 bih.biCompression=0; ipfiarT~)  
 bih.biHeight=btm.bmHeight; \:C@L&3[  
 bih.biPlanes=1; 6JBE=9d-Q  
 bih.biSize=sizeof(BITMAPINFOHEADER); I0oM\~#  
 bih.biSizeImage=size; Ro`Hm8o/  
 bih.biWidth=btm.bmWidth; t5 n$sF  
 bih.biXPelsPerMeter=0; ,6?L.L  
 bih.biYPelsPerMeter=0; +avu&2B  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); rwr>43S5<3  
 static int filecount=0; _O ~DJ"  
 CString name; k0.|%0?K  
 name.Format("pict%04d.bmp",filecount++); dC;@ Fn  
 name=m_Path+name; T:S+P t~  
 BITMAPFILEHEADER bfh;  g!5`R`7  
 bfh.bfReserved1=bfh.bfReserved2=0; x]6OE]]8L  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Zuod1;qIh  
 bfh.bfSize=54+size; aB~?Y+m  
 bfh.bfOffBits=54; ;,n{6`  
 CFile bf; j.X3SQb4G  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1QXv}36#3n  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <e|I?zI9-  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {Cnz7TVB  
  bf.WriteHuge(lpData,size); -sl] funRy  
  bf.Close(); I?@9;0R  
  nCount++; SUxz &xH  
 } +/*,%TdQ4  
 GlobalFreePtr(lpData); k,O("T[  
 if(nCount==1) bCHA!zO  
  m_Number.Format("%d picture captured.",nCount); +4EQ9-  
 else ve_TpP  
  m_Number.Format("%d pictures captured.",nCount); s<LF=qGu  
  UpdateData(FALSE); U#R=y:O?  
} ]Ow A>fb  
7:t+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Hj"`z6@7  
{ _c?&G`  
 if(pMsg -> message == WM_KEYDOWN) J< BBM.^]  
 { b_@MoL@A!  
  if(pMsg -> wParam == VK_ESCAPE) dM8`!~#&PI  
   return TRUE; w$4fS  
  if(pMsg -> wParam == VK_RETURN) lpLjfHr  
   return TRUE; Mp9wYM*  
 } !},_,J~(|  
 return CDialog::PreTranslateMessage(pMsg); %{g<{\@4(;  
} Dsc{- <v  
sI/Jhw)  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zl\mBSBx"  
{ (gZKR2hO  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ b&X- &F  
  SaveBmp(); >8+:{NW  
  return FALSE; }2;~':Mklz  
} fEF1&&8^  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ B uV@w-|  
 CMenu pop; @13vn x  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ;QQLYT  
 CMenu*pMenu=pop.GetSubMenu(0); ntE;*F yH  
 pMenu->SetDefaultItem(ID_EXITICON); TyVn5XHl^  
 CPoint pt; IGEs1  
 GetCursorPos(&pt); gH5E+J_$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); > !k  
 if(id==ID_EXITICON)  chW 1UE  
  DeleteIcon(); y`!~JL*  
 else if(id==ID_EXIT) }stc]L{79  
  OnCancel(); ~]P_Yd-|  
 return FALSE; =B_vQJF2  
} 4% )I[-sH  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )J#7:s]eo  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 0L1NZY^!  
 AddIcon(); oF[l<OY4  
 return res; 'Y{fah  
} fF37P8Ir  
={y Mk  
void CCaptureDlg::AddIcon() @w|'ip5@  
{ ],9%QE  
 NOTIFYICONDATA data; Xc -'&"  
 data.cbSize=sizeof(NOTIFYICONDATA); FB3C'!'<)  
 CString tip; oHH-joYnn  
 tip.LoadString(IDS_ICONTIP); jFfuT9oId  
 data.hIcon=GetIcon(0); )e`$'y@L$  
 data.hWnd=GetSafeHwnd(); Xl^=&!S>me  
 strcpy(data.szTip,tip); =Is.T  
 data.uCallbackMessage=IDM_SHELL; v:kTZB  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ["VUSa  
 data.uID=98; "HSAwe`5jU  
 Shell_NotifyIcon(NIM_ADD,&data); cX u"-/  
 ShowWindow(SW_HIDE); 8%v1[W i  
 bTray=TRUE; dUiv+K)ccQ  
} X8aNl"x  
v1wMXOR  
void CCaptureDlg::DeleteIcon() X@JrfvKv[d  
{ Kk|uN#m  
 NOTIFYICONDATA data; /ghXI"ChI  
 data.cbSize=sizeof(NOTIFYICONDATA); +HvEiY  
 data.hWnd=GetSafeHwnd(); ibo{!>m  
 data.uID=98; U {Xg#UN  
 Shell_NotifyIcon(NIM_DELETE,&data); x TEDC,B  
 ShowWindow(SW_SHOW); F3j#NCuO=z  
 SetForegroundWindow(); R: 8\z0"L*  
 ShowWindow(SW_SHOWNORMAL); S?n,O+q  
 bTray=FALSE; bC{1LY0  
} eCHT) 35u  
uzjP!qO  
void CCaptureDlg::OnChange() C,$$bmS =  
{ Q^=drNV  
 RegisterHotkey(); x-0S-1M  
} z 4 4(  
9D,`9L5-=  
BOOL CCaptureDlg::RegisterHotkey() \UZlFE  
{ 2Ur9*#~kGp  
 UpdateData(); DY| s |:d  
 UCHAR mask=0; {1a%CsCM  
 UCHAR key=0; !0Hx1I<*x  
 if(m_bControl) * 0M[lR0t  
  mask|=4; q))r lMo  
 if(m_bAlt) ^ 'W<|  
  mask|=2;  vU(2[  
 if(m_bShift) *V}T}nK7  
  mask|=1; M{:}.H<a  
  key=Key_Table[m_Key.GetCurSel()]; _)AX/%^%  
 if(bRegistered){ ##Jg>HL'  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); \!D<u'n  
  bRegistered=FALSE; ^i>Tm9vM  
 } (Q~ p"Ch  
 cMask=mask; 8{QN$Qkn  
 cKey=key; |/rms`YQ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >p"ytRu^  
 return bRegistered; }U-h^x'  
} Z_^i2eJYT  
K]5@bm  
  四、小结 ;la sk4|  
rt-^?2c?  
  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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