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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: qD7(+a  
  B@e,3:  
  一、实现方法 X}0NeG^'O  
@jN!j*Y H  
  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: `hM`bcS  
FoWE<  
#pragma data_seg("shareddata") Thn-8DT  
HHOOK hHook =NULL; //钩子句柄 ^=bJ _'  
UINT nHookCount =0; //挂接的程序数目 9~ajEs  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 *'`ByS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 LTS3[=AB  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ] $$ciFM  
static int KeyCount =0;  UB&ofO  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 b.47KJzt  
#pragma data_seg() y&t&'l/m  
fC.-* r  
  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。 4o9#B:N]J  
hz<kR@k}  
  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: ktU98Bk]  
Sq/M %z5'  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR eT[ ,k[#q  
cKey,UCHAR cMask) f?#:@ zcL  
{ [WXtR  
 BOOL bAdded=FALSE; dE_BV=H{  
 for(int index=0;index<MAX_KEY;index++){ ,[,+ _A  
  if(hCallWnd[index]==0){ yx3M0Qo  
   hCallWnd[index]=hWnd; g~h`wv'  
   HotKey[index]=cKey; "'94E,W  
   HotKeyMask[index]=cMask; }h5pM`|1  
   bAdded=TRUE; .^I,C!O#  
   KeyCount++; u]@``Zb|  
   break; )K -@{v^|  
  } /XEcA 5C<  
 } TGdD7n&Ehh  
 return bAdded; (NOAHV0H  
} 7~C@x+1S/  
//删除热键 W:4]-i?2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) K7M7T5<  
{ ScQJsFE6  
 BOOL bRemoved=FALSE; g % q7  
 for(int index=0;index<MAX_KEY;index++){ ppN96-]^0  
  if(hCallWnd[index]==hWnd){ |q^e&M<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !ceuljd]  
    hCallWnd[index]=NULL; LDBxw  
    HotKey[index]=0; [ 8N1tZ{`  
    HotKeyMask[index]=0; -kq=W_  
    bRemoved=TRUE; o ]2=5;)  
    KeyCount--; ,COSpq]6  
    break; ^(V!vI*  
   } rs~RKTv-  
  } ;EW]R9HCH  
 } ~PHAC@pU  
 return bRemoved; W!4GL>9m}A  
} @NlnZfMu  
QL-((dZ<  
{[hV ['Awv  
  DLL中的钩子函数如下: !vr">@}K  
hx+a.N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kMo;<Z  
{ L'J$jB5cP  
 BOOL bProcessed=FALSE; mJc'oG-  
 if(HC_ACTION==nCode) 4fr/ C5M  
 { 1N x%uz  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 @'?<9 2A  
   switch(wParam) _T6WA&;8  
   {  ?%{bMqYJD{  
    case VK_MENU: igOjlg_Q  
     MaskBits&=~ALTBIT; 6NZ3(   
     break; W |G(x8  
    case VK_CONTROL: $bF.6  
     MaskBits&=~CTRLBIT;  8y OzD  
     break; JiDX|Q<c  
    case VK_SHIFT: kFHqQs aG  
     MaskBits&=~SHIFTBIT; /e|`mu%  
     break; kR%CSLOVy  
    default: //judge the key and send message N12K*P[!  
     break; 702&E(rx,  
   } NVS U)#  
   for(int index=0;index<MAX_KEY;index++){ )$P!7$C-  
    if(hCallWnd[index]==NULL) r5(OH3  
     continue; `dMOBYV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g`y >)N/  
    { }pu2/44=W  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4Yt:PN2  
     bProcessed=TRUE; ',z'.t  
    } &~6Z)}  
   } 1MRt_*N4  
  } xh#ef=Bw  
  else if((lParam&0xc000ffff)==1){ //有键按下 K~+y<z E  
   switch(wParam) -/~^S]  
   { /cJ$` pN  
    case VK_MENU: |5V#&e\ES  
     MaskBits|=ALTBIT; +"?K00*(  
     break; -F4CHpua  
    case VK_CONTROL: O#H`/z  
     MaskBits|=CTRLBIT; }{ pNasAU  
     break; A*n'"+_  
    case VK_SHIFT: r*>XkM& M  
     MaskBits|=SHIFTBIT; y{? 6U>_  
     break; RB\>$D  
    default: //judge the key and send message bG^E]a/D  
     break; hnvn&{|  
   } mz+>rc  
   for(int index=0;index<MAX_KEY;index++){ 5[al^'y  
    if(hCallWnd[index]==NULL) x|U]x  
     continue; )KaQ\WJ:   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Zu$f-_"  
    { /!eC;qp;[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NrgN{6u;  
     bProcessed=TRUE; }qmZ  
    } qX0IHe  
   } I:]s/r7  
  } Vd)iv\a  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 cI?dvfU?  
   for(int index=0;index<MAX_KEY;index++){ S@Yb)">ZQ  
    if(hCallWnd[index]==NULL) }dAb} 0XK.  
     continue; Zul]ekv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 2OAh7'8<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); "%A/bv\u  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 VaZS_ qGe:  
   } gpHI)1i'H  
  } M_T$\z;,  
 } 7w @.)@5  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); [uc;M6o}?  
} j &,vju  
5;>M&qmN  
  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: Z&s+*& TM  
;T"}dJel#  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  _"%d9B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^KF  
$*xnq%A  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: |I^\|5  
I = qd\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) xY5Idl->  
{ h}q+Dw.i  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6b-d#H/1Y  
 { 9H1R0iWW  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \r324Bw>2  
  SaveBmp(); =(Mv@eA"  
  return FALSE; iWCN2om  
 } H3QAIsGS  
 …… //其它处理及默认处理 .Ky<9h.K  
} fT[6Cw5w`  
gO*cX&  
'RQZU*8  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 &I:X[=;g  
, *e^,|#  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 8BE OE<  
RW,ew!Z  
  二、编程步骤 <rRm bFH#  
15iCJ p  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; vFL3eu#  
,":"Op61  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; T oy~\  
:n0(gB  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; /A_</GYs  
7#MBT-ih  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ]pB0bJAt  
q jDW A'  
  5、 添加代码,编译运行程序。 (66X  
gLl?e8[F  
三、程序代码 X[j4V<4O  
gBYL.^H^l  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL V,|l&-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) m ~fqZK  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Y'Wj7P  
#if _MSC_VER > 1000 _#f/VE  
#pragma once ^zs CF0  
#endif // _MSC_VER > 1000 `r_qvrC  
#ifndef __AFXWIN_H__ wh|[ "U('  
#error include 'stdafx.h' before including this file for PCH C0i:*1  
#endif ?Sn$AS I  
#include "resource.h" // main symbols lH:TE=|4  
class CHookApp : public CWinApp Z:O24{ro5  
{ BB--UM{7  
 public: %lv2;-  
  CHookApp(); JF: QQ\  
  // Overrides cp0>Euco=  
  // ClassWizard generated virtual function overrides ~M(K{6R  
  //{{AFX_VIRTUAL(CHookApp) [xO^\oQa=c  
 public: x"8(j8e  
  virtual BOOL InitInstance(); 9@QP?=\Y  
  virtual int ExitInstance(); 1_7x'5GdA  
  //}}AFX_VIRTUAL L9fhe,en  
  //{{AFX_MSG(CHookApp) H!Uy4L~>  
  // NOTE - the ClassWizard will add and remove member functions here. 2?Q IK3"v  
  // DO NOT EDIT what you see in these blocks of generated code ! # Sb1oLC  
  //}}AFX_MSG *3S,XMS{O  
  DECLARE_MESSAGE_MAP() (G#)[0<fX  
}; pSE"] N  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); <~"qz*_  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); T-fW[][&$  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4{CVBowi  
BOOL InitHotkey(); 9m!4U2N,s  
BOOL UnInit(); `9a%}PVQ-  
#endif ``w,CP ?  
C~'}RM  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. s,K @t_J  
#include "stdafx.h" +wD--24!(  
#include "hook.h" DI!NP;E  
#include <windowsx.h> }4cLU.L8O  
#ifdef _DEBUG U g]6i+rp  
#define new DEBUG_NEW J:#B,2F+^  
#undef THIS_FILE oF]0o`U&a  
static char THIS_FILE[] = __FILE__; D?@330'P9C  
#endif KNIYar*3  
#define MAX_KEY 100 m[ay  
#define CTRLBIT 0x04 K`(STvtM  
#define ALTBIT 0x02 g@MTKqs  
#define SHIFTBIT 0x01 {n$9o  
#pragma data_seg("shareddata") egx(N <  
HHOOK hHook =NULL; e_k1pox]l  
UINT nHookCount =0; fcnbPO0M  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey +c}fDrr)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT T>vHZZiO  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ws?p2$Cla  
static int KeyCount =0; }(op;7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift U+~0m!|4  
#pragma data_seg() {(ey!O  
HINSTANCE hins; uO,90g[C/R  
void VerifyWindow(); 6D{|!i|r4  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 1k{ E7eL  
//{{AFX_MSG_MAP(CHookApp) NkNw9?:#4  
// NOTE - the ClassWizard will add and remove mapping macros here. bi#o1jR  
// DO NOT EDIT what you see in these blocks of generated code! o2a`4K  
//}}AFX_MSG_MAP ln9MVF'!&  
END_MESSAGE_MAP() ^Bm9y R  
"F"G(ba^  
CHookApp::CHookApp() +P}'2tE~'  
{ hkHMBsNi  
 // TODO: add construction code here, ,6i67!lb  
 // Place all significant initialization in InitInstance .s7o$u~l  
} #(ANyU(#e  
=ZzhH};aX  
CHookApp theApp; r^WO$u|@i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) <X|"5/h  
{ 2x$\vL0  
 BOOL bProcessed=FALSE; f 7d)  
 if(HC_ACTION==nCode) Sh2q#7hf  
 { >,uof?  
  if((lParam&0xc0000000)==0xc0000000){// Key up 1i bQ'bZ  
   switch(wParam) *bmk(%g  
   { .LnXKRd{  
    case VK_MENU: *% Vd2jW/  
     MaskBits&=~ALTBIT; &Vnet7LfU  
     break; @iC!Q>D  
    case VK_CONTROL: J>!p^|S{  
     MaskBits&=~CTRLBIT; I4qzdD  
     break; \Qu~iB(Y  
    case VK_SHIFT: )c]GgPH  
     MaskBits&=~SHIFTBIT;  Gp@Y=mU  
     break; 8 l}tYl`|  
    default: //judge the key and send message | 2p\M?@  
     break; 8{%/!ylJz  
   } N7+K$)3  
   for(int index=0;index<MAX_KEY;index++){ akJ{-   
    if(hCallWnd[index]==NULL) mQ VduG  
     continue; KW+^9&lA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F4kU) i  
    { 3~s0ux[  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6NJ La|&n  
     bProcessed=TRUE; cCyg&% zsT  
    } qLA  
   } 6tzZ j:y q  
  } Ujq)h:`  
  else if((lParam&0xc000ffff)==1){ //Key down FE/&<g0,:  
   switch(wParam) ;S,g&%N  
   { AWD &K!  
    case VK_MENU: ={={ W  
     MaskBits|=ALTBIT; vQu) uml  
     break; ou,W|<%  
    case VK_CONTROL: nHyWb6  
     MaskBits|=CTRLBIT; G\jr^d\  
     break; 5XFhjVmEL  
    case VK_SHIFT: k?|VFh1  
     MaskBits|=SHIFTBIT; Lm,io\z  
     break; f=} u;^  
    default: //judge the key and send message ]y-r I  
     break; 4J94iI>S.l  
   } OSfwA&  
   for(int index=0;index<MAX_KEY;index++) `1M_rG1/+  
   { PM%./  
    if(hCallWnd[index]==NULL) ~g1@-)zYxK  
     continue; Qbt fKn95  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |])%yRAGQ  
    { m_\CK5T_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); RDzL@xCcn  
     bProcessed=TRUE; ``aoLQc`  
    } 47$JN}qI0  
   } >s[}f6*2@  
  } Z#7HuAF{]  
  if(!bProcessed){ ' nf"u  
   for(int index=0;index<MAX_KEY;index++){ .(1=iL_3e  
    if(hCallWnd[index]==NULL) <C${1FO7If  
     continue; ~;bwfp_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <KHB/7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O}IS{/^7  
   } F^A1'J  
  } $Cc4Sggq  
 } ; h/Y9uYn  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "TN}=^A\F  
} ,,fLK1  
ELY$ ]^T  
BOOL InitHotkey() JK,#dA#  
{ ,Z MYCl]  
 if(hHook!=NULL){ w:z_EV!&  
  nHookCount++; V!]e#QH;  
  return TRUE; -J? df  
 }  pSV 8!  
 else G=yQYsC$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Jv7 @[<$  
  if(hHook!=NULL) -pg7>vOq  
   nHookCount++; {Z-5  
  return (hHook!=NULL); tC|5;'m.2  
} "GZhr[AW  
BOOL UnInit() Ij#%Qu  
{ r8Gq\ ^  
 if(nHookCount>1){ K2{aNv R)t  
  nHookCount--; 424(3-/v;  
  return TRUE; /,@p\Ae5  
 } piy`zc- yu  
 BOOL unhooked = UnhookWindowsHookEx(hHook); q%Yn;g|_  
 if(unhooked==TRUE){ up>c$jJ  
  nHookCount=0; 3^?ZG^V  
  hHook=NULL; 30>3 !Xqa  
 } ,m_WR7!$E  
 return unhooked; ZfrVjUB  
} IQZ#-)[T"  
83%)/_&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lf(`SYQnOY  
{ !-<p,z  
 BOOL bAdded=FALSE; _ :Ag?2  
 for(int index=0;index<MAX_KEY;index++){ e:'?*BYVg3  
  if(hCallWnd[index]==0){ ,:LA.o}h  
   hCallWnd[index]=hWnd; I,yC D7l_  
   HotKey[index]=cKey; ]\ !5}L  
   HotKeyMask[index]=cMask; R :X0'zeRr  
   bAdded=TRUE; `h:34RC;  
   KeyCount++; ":a\z(*t  
   break; ]:>,A@7  
  } i4JqT\q  
 } Fz#X= gmG  
 return bAdded; bKg8rK u  
} _{<seA  
/!h;c$  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) oVFnl A  
{ kF(n!2"W  
 BOOL bRemoved=FALSE; 7lV.[&aKW  
 for(int index=0;index<MAX_KEY;index++){ %yBB?cp+_  
  if(hCallWnd[index]==hWnd){ ,#MCn  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1W7% 1FA  
    hCallWnd[index]=NULL; ljTBvU  
    HotKey[index]=0; >zAUW[]C:I  
    HotKeyMask[index]=0; 86]p#n_>Fv  
    bRemoved=TRUE; ,XDRO./+T  
    KeyCount--; Gmwf4>"  
    break; *g?Po+ef%  
   } 7X@mSXis  
  } ~t9tnLc$  
 } 8>hwK)av  
 return bRemoved; }\J2?Et{  
} {9UEq0  
ry9T U  
void VerifyWindow() >B]'fUt5a  
{ x }Ad_#q  
 for(int i=0;i<MAX_KEY;i++){ 'AN>`\mR$  
  if(hCallWnd!=NULL){ =[b)1FUp  
   if(!IsWindow(hCallWnd)){ RuII!}*  
    hCallWnd=NULL; /1Ue?)g  
    HotKey=0; ck?YI]q|  
    HotKeyMask=0; dXF^(y]l  
    KeyCount--; p w8 s8?  
   } `tP7ncky  
  } _S>JKz  
 } I(S`j[U  
} 4R18A=X  
:oJ=iB'Zc  
BOOL CHookApp::InitInstance() 'Ut7{rZ5  
{ hjZKUM G(k  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 'yMF~r3J  
 hins=AfxGetInstanceHandle(); ggJO:$?$L  
 InitHotkey(); *S2ypzwRZ,  
 return CWinApp::InitInstance(); [Xb@Wh:yG  
} nBk)WX&[K  
uj :%#u  
int CHookApp::ExitInstance() BNL;Biy t7  
{ uEX!xx?Q#  
 VerifyWindow(); JvY}-}?c  
 UnInit(); H$y-8-&)  
 return CWinApp::ExitInstance(); 0`^&9nR  
} |JQQU! x  
293M\5:  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file o!)3?  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) On?p 9^9  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 8- 2cRs  
#if _MSC_VER > 1000 7(pF[LCF  
#pragma once I:mr}mv=i  
#endif // _MSC_VER > 1000 C.FI~Z  
q FAT]{{  
class CCaptureDlg : public CDialog N;\'N ne  
{ AvfNwE  
 // Construction y&V@^ "`  
 public: 9I4K}R  
  BOOL bTray; rk #sy$  
  BOOL bRegistered; BocSwf;v.  
  BOOL RegisterHotkey(); c@893<_  
  UCHAR cKey; Y'8?.a]'  
  UCHAR cMask; "1%5,  
  void DeleteIcon(); V,cBk  
  void AddIcon(); DQ r Y*nH  
  UINT nCount; RJd(~1  
  void SaveBmp(); 3.*8)NW  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ))"6ern  
  // Dialog Data [n :<8ho  
  //{{AFX_DATA(CCaptureDlg) zx)z/1  
  enum { IDD = IDD_CAPTURE_DIALOG }; Y\No4w ^|d  
  CComboBox m_Key; , GP?amh  
  BOOL m_bControl; HhvdqvIEG  
  BOOL m_bAlt; x^y'P<ypw  
  BOOL m_bShift; y!_C/!d  
  CString m_Path; -4 SY=NC_  
  CString m_Number; JU)dr4S?  
  //}}AFX_DATA v_DedVhe  
  // ClassWizard generated virtual function overrides YB2VcF.LU  
  //{{AFX_VIRTUAL(CCaptureDlg) JsODzw  
 public: ^zQ/mo,Z  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 8|\8O@  
 protected: a6uJYhS~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |>dI/_'  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =w{Z@S(ukz  
  //}}AFX_VIRTUAL vkri+:S3  
  // Implementation Zcx`SC-0  
 protected: e]zBf;9 J  
  HICON m_hIcon; C$XU%5qi  
  // Generated message map functions OG>}M$ Ora  
  //{{AFX_MSG(CCaptureDlg) =Jyu4j *}  
  virtual BOOL OnInitDialog(); u)+8S/ )  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); }khV'6"'|  
  afx_msg void OnPaint(); ~ v|>xqWV  
  afx_msg HCURSOR OnQueryDragIcon(); `u&Rsz&^  
  virtual void OnCancel(); @U& QI*  
  afx_msg void OnAbout(); #Up86(Z  
  afx_msg void OnBrowse(); Al} B34.uh  
  afx_msg void OnChange(); 9,:l8  
 //}}AFX_MSG -C(crn  
 DECLARE_MESSAGE_MAP() v0H@Eg_  
}; SC)g^E#  
#endif huh6t !  
b?tB(if!I  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file j}.\]$J  
#include "stdafx.h" CDK 5  
#include "Capture.h" >JFO@O5  
#include "CaptureDlg.h" /}b03  
#include <windowsx.h> rrik,qyv6  
#pragma comment(lib,"hook.lib") ] Zy5%gI  
#ifdef _DEBUG s;01u_  
#define new DEBUG_NEW r{L> F]Tw  
#undef THIS_FILE >I-RGW'A  
static char THIS_FILE[] = __FILE__; *Doa* wQ  
#endif LnH?dy  
#define IDM_SHELL WM_USER+1 S.-TOE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); '!!CeDy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ! |<Fo'U  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; kuszb~`zPY  
class CAboutDlg : public CDialog Oi8.8M  
{ |EX(8y  
 public: TJ6*t!'*X  
  CAboutDlg(); A>o *t=5  
  // Dialog Data 5K>3My#  
  //{{AFX_DATA(CAboutDlg) +0nJ  
  enum { IDD = IDD_ABOUTBOX }; dMv=gdY  
  //}}AFX_DATA nrub*BuA  
  // ClassWizard generated virtual function overrides 4;yKOQD|  
  //{{AFX_VIRTUAL(CAboutDlg) JfLqtXF[&"  
 protected: l5!|I:/*;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e D?tLj  
  //}}AFX_VIRTUAL k@RDvn  
  // Implementation 8]/bK5`  
 protected: _E@2ZnD2  
  //{{AFX_MSG(CAboutDlg) hKL4cpK4  
  //}}AFX_MSG f!Y?S  
  DECLARE_MESSAGE_MAP() 5YE'L.  
}; Jh,]r?Bd  
R3gdLa.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ezc?#<+7  
{ e>+i>/Fn{h  
 //{{AFX_DATA_INIT(CAboutDlg) 3no%E03p  
 //}}AFX_DATA_INIT `T@i.'X  
} u8&Z!p\  
Y']\Jq{OS  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) E7j(QO f  
{ SJb&m-  
 CDialog::DoDataExchange(pDX); . qO@Q=  
 //{{AFX_DATA_MAP(CAboutDlg) ! >(7+B3E*  
 //}}AFX_DATA_MAP riY~%9iV'  
} zy/@ WFPE  
a*lh)l<KV  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) pjKWtY@=X  
 //{{AFX_MSG_MAP(CAboutDlg) `VA"vwz  
 // No message handlers =Y{(%sn  
 //}}AFX_MSG_MAP <\r T%f}3^  
END_MESSAGE_MAP() UZ\u;/}  
4":KoS`,j  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) K[YI4pt7  
: CDialog(CCaptureDlg::IDD, pParent) kCWV r  
{ YxYH2*q@  
 //{{AFX_DATA_INIT(CCaptureDlg) >JHryS.j$4  
  m_bControl = FALSE; :~"CuB/  
  m_bAlt = FALSE; g:g\>@Umo  
  m_bShift = FALSE; -$,TMqM  
  m_Path = _T("c:\\"); t3 8m'J :>  
  m_Number = _T("0 picture captured."); BO~ 0ON0  
  nCount=0; HVR /7&g  
  bRegistered=FALSE; ry`Ho8N  
  bTray=FALSE; AifWf2$S  
 //}}AFX_DATA_INIT <'y?KiphL  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 cOmw?kA*G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); n9W(bG o  
} 'N (:@]4N  
(-UYB9s  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [+2[`K c]  
{ xgVeN["  
 CDialog::DoDataExchange(pDX); aL+ o /  
 //{{AFX_DATA_MAP(CCaptureDlg) T0wW<_jh  
  DDX_Control(pDX, IDC_KEY, m_Key); HJ=:8:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); !![DJ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); X9v.1s,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); > kG GR  
  DDX_Text(pDX, IDC_PATH, m_Path); '\l"   
  DDX_Text(pDX, IDC_NUMBER, m_Number); "jeb%k  
 //}}AFX_DATA_MAP j/323Za+  
} `uv2H$  
?8npG]L)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) tU}h~&M  
//{{AFX_MSG_MAP(CCaptureDlg) @K  &GJ  
 ON_WM_SYSCOMMAND() B3pCy~*5  
 ON_WM_PAINT() o |{5M|nD  
 ON_WM_QUERYDRAGICON() 7OcW C-<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) q<xCb%#Jl  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) [%"|G9  
 ON_BN_CLICKED(ID_CHANGE, OnChange) }"nItcp.1  
//}}AFX_MSG_MAP YqhAZp<  
END_MESSAGE_MAP() x|/|jzJSX  
>N^Jj:~l  
BOOL CCaptureDlg::OnInitDialog() =MQoC:l  
{ ^cOUQ33  
 CDialog::OnInitDialog(); sJB;3"~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); B]nEkO'a:  
 ASSERT(IDM_ABOUTBOX < 0xF000); CKYc\<zR0l  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :%l TU  
 if (pSysMenu != NULL) }MJy +Z8&  
 { w$3 ,A$8  
  CString strAboutMenu; py$Q  
  strAboutMenu.LoadString(IDS_ABOUTBOX); z`.<U{5  
  if (!strAboutMenu.IsEmpty()) pNG:0  
  { $t$ShT)  
   pSysMenu->AppendMenu(MF_SEPARATOR); y;35WtDVb  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .[]r}[lU  
  } X&tF;<m^  
 } Z;h t  
 SetIcon(m_hIcon, TRUE); // Set big icon Q- cFtu-w  
 SetIcon(m_hIcon, FALSE); // Set small icon m|SUV  
 m_Key.SetCurSel(0); wL+s8#{  
 RegisterHotkey(); QyEn pZ8?a  
 CMenu* pMenu=GetSystemMenu(FALSE); 9P1OP Xv*p  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); (!ux+K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); nHM~  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); :(/~:^!  
 return TRUE; // return TRUE unless you set the focus to a control VQc_|z_ s  
} b.2aHu( 3  
"3X2VFwoJ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rN<0 R`4sE  
{ R3 -n>V5o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lUOF4U&r  
 { Vh'P&W?[  
  CAboutDlg dlgAbout; F%@A6'c  
  dlgAbout.DoModal(); E-T)*`e  
 } }n]Ng]KM`  
 else ;,hwZZA  
 { @:oXN]+ _  
  CDialog::OnSysCommand(nID, lParam); Ot4 Z{mA  
 } Xpr?Kgz  
} ]0Y4U7W  
0!4Ts3qn1  
void CCaptureDlg::OnPaint() |UkR'Ma  
{ Gt\lFQ  
 if (IsIconic()) wg9t)1k{e  
 { D#_3^Kiawj  
  CPaintDC dc(this); // device context for painting :NhO2L  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); G!Op~p@Jm  
  // Center icon in client rectangle 7o7)0l9!  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0eT(J7[ <  
  int cyIcon = GetSystemMetrics(SM_CYICON); LoURC$lS  
  CRect rect; UE8kpa)cQ  
  GetClientRect(&rect); vk}n,ecl  
  int x = (rect.Width() - cxIcon + 1) / 2; OSRp0G20k\  
  int y = (rect.Height() - cyIcon + 1) / 2; dcDyK!zz"  
  // Draw the icon !8TlD-ZT/  
  dc.DrawIcon(x, y, m_hIcon); _zR+i]9   
 } +Zb;Vn4  
 else (of#(I[m7  
 { qrb[-|ie&  
  CDialog::OnPaint(); T-'OwCB1q  
 } )MtF23k)g  
} w^\52  
T`9lV2x*P  
HCURSOR CCaptureDlg::OnQueryDragIcon() .iYJr;9`d  
{ @KXV%a'  
 return (HCURSOR) m_hIcon; :N:yLd} &  
} FI)17i$  
[@&m4 7  
void CCaptureDlg::OnCancel() %vn|k[n D  
{ 'f#{{KA  
 if(bTray) PIJr{6B/PA  
  DeleteIcon(); K%,2=.  
  CDialog::OnCancel(); 4.k0<  
} ?k+xSV  
[u =+3b  
void CCaptureDlg::OnAbout() ;0Q4<F  
{ DHy q^pJ  
 CAboutDlg dlg; qSM|hHDo)  
 dlg.DoModal(); -z ID x  
} 6]&OrS[  
.6ylZ  
void CCaptureDlg::OnBrowse() evya7^,F  
{ 9)h"-H;5:  
 CString str; )cX*I gO  
 BROWSEINFO bi; Ab~3{Q]#  
 char name[MAX_PATH]; qFicBpB  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); G'nmllB`]  
 bi.hwndOwner=GetSafeHwnd(); Q3XpHnufu+  
 bi.pszDisplayName=name; 1rNzJ;'  
 bi.lpszTitle="Select folder"; =T3 <gGM  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; |.(dq^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]Oe2JfJwx  
 if(idl==NULL) r7RIRg_  
  return; ;nI] !g:  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); sZ3KT&  
 str.ReleaseBuffer(); hXcyoZ8  
 m_Path=str; s,"]aew  
 if(str.GetAt(str.GetLength()-1)!='\\') ?so=;gh  
  m_Path+="\\"; mu\6z_e  
 UpdateData(FALSE); ]V[q(-Jk  
} o$wEEz*4  
7z%L*z8V  
void CCaptureDlg::SaveBmp() =%BSKSG.  
{ a]$1D!Anc  
 CDC dc; 2+RUTOv/d  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); VRVO-Sk  
 CBitmap bm; M  f}~{+  
 int Width=GetSystemMetrics(SM_CXSCREEN); c_dVWh e  
 int Height=GetSystemMetrics(SM_CYSCREEN); zKyyU}LHH  
 bm.CreateCompatibleBitmap(&dc,Width,Height); b10cuy|a/X  
 CDC tdc; tl[Uw[  
 tdc.CreateCompatibleDC(&dc); P:hBt\5B  
 CBitmap*pOld=tdc.SelectObject(&bm); U2ohHJ``  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ({ +!`}GY  
 tdc.SelectObject(pOld); /?wtF4  
 BITMAP btm; nyX2|m&  
 bm.GetBitmap(&btm); FXpJqlhNv  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; TCMCK_SQL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); +Te\H  
 BITMAPINFOHEADER bih; TeMHm ?1^  
 bih.biBitCount=btm.bmBitsPixel; <!&[4-;fU  
 bih.biClrImportant=0; HNb/-e ,"  
 bih.biClrUsed=0; S%$ }(  
 bih.biCompression=0; ^8]NxV@l  
 bih.biHeight=btm.bmHeight; )~& CvJ  
 bih.biPlanes=1; aacpM[{f  
 bih.biSize=sizeof(BITMAPINFOHEADER); L{#IT.  
 bih.biSizeImage=size; t DO=P c  
 bih.biWidth=btm.bmWidth; 2\)xpOj  
 bih.biXPelsPerMeter=0; mWv3!i;G<s  
 bih.biYPelsPerMeter=0; hM_lsc  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0$(WlP |  
 static int filecount=0; 'HO$C, 1]  
 CString name; kF3k7,.8&  
 name.Format("pict%04d.bmp",filecount++); kc2 PoJ  
 name=m_Path+name; #?RU;1)Cw  
 BITMAPFILEHEADER bfh; 2\R'@L*  
 bfh.bfReserved1=bfh.bfReserved2=0; _1!7V3|^  
 bfh.bfType=((WORD)('M'<< 8)|'B'); xn?a. 3b'  
 bfh.bfSize=54+size; m1j*mtu  
 bfh.bfOffBits=54; <NHH^M\N  
 CFile bf; )n1_(;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /~DI 6g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); fPU`/6  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); O 5!7'RZ  
  bf.WriteHuge(lpData,size); _;W.q7 b]  
  bf.Close(); {k(g]#pP  
  nCount++; hMa]B*o/-  
 } u/UrAqw  
 GlobalFreePtr(lpData); @Rg/~\K  
 if(nCount==1)  nI[os  
  m_Number.Format("%d picture captured.",nCount); >R|/M`<ph  
 else n"$jG:A QJ  
  m_Number.Format("%d pictures captured.",nCount); R%Hi+#/dr-  
  UpdateData(FALSE); m\;R2"H%  
} M+-*QyCFK  
&C:IX\  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) QfmJn((  
{ ZVW'>M7.  
 if(pMsg -> message == WM_KEYDOWN) @MoKWfc  
 { "H2EL}3/]  
  if(pMsg -> wParam == VK_ESCAPE) WEAT01  
   return TRUE; mR!1DQ.\<  
  if(pMsg -> wParam == VK_RETURN) M|VyV (f  
   return TRUE; HsxVZ.dS  
 } GmK^}=frj  
 return CDialog::PreTranslateMessage(pMsg); +|*IZ:w)  
} <:_wbVn-  
9U7nKJ+iby  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ,t3wp#E2#  
{ G%BjhpL  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 2L!u1  
  SaveBmp(); GL&y@6  
  return FALSE; K:J3Z5"  
} QZ!Y2Bz(4  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ |Yx~;q:  
 CMenu pop; +u.1 ;qF  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \c,ap49RC  
 CMenu*pMenu=pop.GetSubMenu(0);  ;i4Q|  
 pMenu->SetDefaultItem(ID_EXITICON); SQ@y;|(  
 CPoint pt; x;w6na  
 GetCursorPos(&pt); tE.FrZS  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); G `+T+  
 if(id==ID_EXITICON) A4Rug\p]  
  DeleteIcon(); #HYr0Tw6`  
 else if(id==ID_EXIT) Nv$ R\'3  
  OnCancel(); Id*Ce2B  
 return FALSE; hC:n5]K  
}  JR'  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); q~ tz? T_  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) r=Gks=NX"  
 AddIcon(); oL-]3TY~  
 return res; Y=%tn8<  
} q$p%ZefZ  
) g0%{dfJ  
void CCaptureDlg::AddIcon() Y$o< 6[7  
{ z__EYh  
 NOTIFYICONDATA data; 4Xgg%@C  
 data.cbSize=sizeof(NOTIFYICONDATA); FSP+?((  
 CString tip; eP.wOl  
 tip.LoadString(IDS_ICONTIP); w2Us!<x  
 data.hIcon=GetIcon(0); &]V.S7LC #  
 data.hWnd=GetSafeHwnd(); 7Sf bx~48  
 strcpy(data.szTip,tip); Uq[>_"}  
 data.uCallbackMessage=IDM_SHELL; uyO/55;HO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; f0A{W/0n  
 data.uID=98; ``V" D  
 Shell_NotifyIcon(NIM_ADD,&data); WJ$bf(X*  
 ShowWindow(SW_HIDE); i1UiNJh86  
 bTray=TRUE; Ha(c'\T (\  
} dW_KU}  
09|K>UC)v  
void CCaptureDlg::DeleteIcon() imo$-}A  
{ #TeG-sFJg@  
 NOTIFYICONDATA data; B3:ez jj  
 data.cbSize=sizeof(NOTIFYICONDATA); B#exHf8  
 data.hWnd=GetSafeHwnd(); w2 ;eh]k  
 data.uID=98; AmvEf  
 Shell_NotifyIcon(NIM_DELETE,&data); }\hVy(\c  
 ShowWindow(SW_SHOW); ;m0~L=w  
 SetForegroundWindow(); :Hn6b$Vy8  
 ShowWindow(SW_SHOWNORMAL); :uP,f<=)K  
 bTray=FALSE; kh!FR u h  
} [O$Wa:< 0x  
VdPtPq1  
void CCaptureDlg::OnChange() ?OId\'q  
{ O $LfuL  
 RegisterHotkey(); rr+|Zt Y  
} V n7*JS  
vV6<^ W:9F  
BOOL CCaptureDlg::RegisterHotkey() Sw:7pByjI  
{ &[_g6OL  
 UpdateData(); Jk&3%^P{m  
 UCHAR mask=0; UXeN8  
 UCHAR key=0; d<% z 1Dj2  
 if(m_bControl) k\wW##=v  
  mask|=4; $}RJ,%~'x  
 if(m_bAlt) bG7O  
  mask|=2; cq5jPZ}  
 if(m_bShift) 1G"z<v B  
  mask|=1; ;}7Rjl#  
  key=Key_Table[m_Key.GetCurSel()]; E08 klC0  
 if(bRegistered){ >x/z7v?^I  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ,f<?;z  
  bRegistered=FALSE; t,QyfN  
 } DD7h^-x  
 cMask=mask; ]}*R|1  
 cKey=key; IW>T}@ |  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ;t'5},(FP  
 return bRegistered; 7zA'ri3w  
} 8R2QZXJb-  
Jy^u?  
  四、小结 cU RkP`  
 0bz'&  
  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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