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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: c}$>UhLe  
  ^W=hs9a+F  
  一、实现方法 837:;<T  
7;@YR  
  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: Q)4[zStR#  
GQ?FUFuIoW  
#pragma data_seg("shareddata") Ff>X='{  
HHOOK hHook =NULL; //钩子句柄 5l@} 1n  
UINT nHookCount =0; //挂接的程序数目 [u*7( 4e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 J ?aJa  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Zjn1,\(t~u  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey mpD.x5jm<  
static int KeyCount =0; x])j]k  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 uL7}JQ,  
#pragma data_seg() gA_oJW4_  
-">Tvi4  
  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。 g qORE/[  
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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: C$q-WoTM(  
 8zRw\]?  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ^y ', l  
cKey,UCHAR cMask) 9wc\~5{li  
{ "i&n;8?Y  
 BOOL bAdded=FALSE; K)l*$h&-  
 for(int index=0;index<MAX_KEY;index++){ D`Vb3aNB=L  
  if(hCallWnd[index]==0){ E)Qg^DHP/  
   hCallWnd[index]=hWnd; LjGLi>kI~  
   HotKey[index]=cKey; Xo(W\Pes  
   HotKeyMask[index]=cMask; jQz^)8)B  
   bAdded=TRUE; RF6]_-  
   KeyCount++; OAo03KW  
   break; <oP`\m   
  }  WSeiW  
 } :-+][ [  
 return bAdded; . P 44t  
} [`h,Ti!m<  
//删除热键 8  rE`  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) bg9_$laDi  
{ dUn]aS  
 BOOL bRemoved=FALSE; [Z'4YXS  
 for(int index=0;index<MAX_KEY;index++){ bZK`]L[   
  if(hCallWnd[index]==hWnd){ %NlmLWF.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Smy J@.L"  
    hCallWnd[index]=NULL; 4 }_}3.  
    HotKey[index]=0; u-n$%yDS  
    HotKeyMask[index]=0; ZA_~o#0%  
    bRemoved=TRUE; p+Bvfn  
    KeyCount--; tIBEja^l  
    break; {hO|{vz  
   } Y8s-cc(  
  } @:'E9J06  
 } 26_PFHQu4  
 return bRemoved; `.VkR5/  
} PMQ31f/zf  
c}=[r1M*  
&,XPMT  
  DLL中的钩子函数如下: |M<R{Tt}nf  
} -hH2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \sVzBHy d  
{ EG=U](8T  
 BOOL bProcessed=FALSE; },5LrX`L  
 if(HC_ACTION==nCode) R 'mlKe x  
 { W^:g_  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 6xh -m  
   switch(wParam) XxB%  
   {  |QH )A  
    case VK_MENU: 7S&O {Q7)  
     MaskBits&=~ALTBIT; [)[?FG9   
     break; +C`vO5\0  
    case VK_CONTROL: E9 #o0Di  
     MaskBits&=~CTRLBIT; 1U~'8=-   
     break; hoPh#? G  
    case VK_SHIFT: .b*-GWx  
     MaskBits&=~SHIFTBIT; 0B`rTLwB  
     break; _#P5j#  
    default: //judge the key and send message eBECY(QMQ  
     break; g2r8J0v  
   } =o"sBVj  
   for(int index=0;index<MAX_KEY;index++){ %HZ!s `w_  
    if(hCallWnd[index]==NULL) X~; *zYd5  
     continue; ;P|v'NNI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l_q1h]/   
    { jI}{0LW&F&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); : SD3  
     bProcessed=TRUE; 6Vu??qBy  
    } @yPI$"Ma  
   } V3pn@'pr  
  } =8qhK=&]  
  else if((lParam&0xc000ffff)==1){ //有键按下 Mr K?,7*Xi  
   switch(wParam) {\!@ k\__  
   { ol4!#4Y&{  
    case VK_MENU: $/JnYkL{m  
     MaskBits|=ALTBIT; oB}rd9  
     break; \HJt}  
    case VK_CONTROL: G!ryW4  
     MaskBits|=CTRLBIT; ybm&g( -\  
     break; n lvDMZ  
    case VK_SHIFT: TU8K\;l]  
     MaskBits|=SHIFTBIT; Zf\It<zT5  
     break; a)L=+Z  
    default: //judge the key and send message yF&?gPh&  
     break; K)8 m?sf/  
   } v[ y|E;B  
   for(int index=0;index<MAX_KEY;index++){ E"H> [E  
    if(hCallWnd[index]==NULL) !jJH}o/KW  
     continue; fAR0GOI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U &W}c^#  
    { Cd'SPaR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >\!>CuU  
     bProcessed=TRUE; }xzbg  
    } ~hA;ji|I  
   } oakm{I|k}  
  } L@5g#mSl  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7\;gd4Ua1  
   for(int index=0;index<MAX_KEY;index++){ nr9c G/"  
    if(hCallWnd[index]==NULL) k{$Mlt?&-  
     continue; w~9=6|_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {I_I$x_  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); m`ab5<%Gn  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (V~PYf%  
   } {?'c|\n Li  
  } G9\@&=  
 } lhV'Q]s@6  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .7GAGMNS  
} R_DZJV O  
oG;;='*  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: V$ss[fX  
b<rJ@1qtJ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _52BIrAO2  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W%7m3/d  
uO`YA]  
  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: h|'T'l&z  
IC7S +v  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4mzWNr>fb  
{ 7_#i,|]58  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cS1BB#N0  
 { |2~fOyA+  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 >;@hA*<  
  SaveBmp(); eqE%ofW  
  return FALSE; \=/^H  
 } Me*]Bh  
 …… //其它处理及默认处理 KI Ua  
} wKAc ;!  
(Sg52zv  
\uV;UH7qe  
  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。 FPPGf!Eq  
nMHs5'_y  
  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。 $.@)4Nu!_  
jlZW!$Iq  
  二、编程步骤 Ot} E  
sj@'C@oK  
  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"; V<!E9/4rS  
/\9X0a2h|E  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; l;g8_uyjv7  
aTy&"  
  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; f&ym'S  
!>+Na~eN  
  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; V+l>wMeo  
Et+N4w  
  5、 添加代码,编译运行程序。 .ZrQ{~t  
^dR5fAS  
三、程序代码 z_J"Qk  
d98ZC+q  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL }A"%YDrNbG  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) LJMw-#61sj  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ s],+]<qX  
#if _MSC_VER > 1000 k w!1]N  
#pragma once 0:(@Y  
#endif // _MSC_VER > 1000 ukSi9| 1-,  
#ifndef __AFXWIN_H__ $fY4amX6Z  
#error include 'stdafx.h' before including this file for PCH rX#} 2  
#endif 5sq#bvfJ o  
#include "resource.h" // main symbols f13%[RA9N  
class CHookApp : public CWinApp d(L u|/~  
{ * 5#Y [c  
 public: ZIx,?E+eJ  
  CHookApp(); l~M86 h  
  // Overrides DPNUm<>  
  // ClassWizard generated virtual function overrides XoaBX2  
  //{{AFX_VIRTUAL(CHookApp) f&Bu_r  
 public: of ^N4  
  virtual BOOL InitInstance(); ; . c]0  
  virtual int ExitInstance(); Hdh'!|w  
  //}}AFX_VIRTUAL P$\vD^  
  //{{AFX_MSG(CHookApp) GIDC'  
  // NOTE - the ClassWizard will add and remove member functions here. <Ep-aRI  
  // DO NOT EDIT what you see in these blocks of generated code ! b&!7(Q[ sT  
  //}}AFX_MSG Au,}5=+`P  
  DECLARE_MESSAGE_MAP() %fpcH  
}; S0~F$mP'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ;%#@vXH[Oo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ss&R!w9p  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); jv]:`$}G\  
BOOL InitHotkey(); rK2*DuE  
BOOL UnInit(); 65Ysg}x  
#endif lfKrd3KS_  
Dg@>d0FW  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 3D k W  
#include "stdafx.h" Px}#{fkS  
#include "hook.h" C``%<)WC  
#include <windowsx.h> #kV`G.EX  
#ifdef _DEBUG W&6P%0G/  
#define new DEBUG_NEW B" wk:\zC  
#undef THIS_FILE vpUS(ztvs  
static char THIS_FILE[] = __FILE__; VWG#v #o  
#endif h2u> CXD  
#define MAX_KEY 100 ;#!`c gAh  
#define CTRLBIT 0x04 =1%3". "n@  
#define ALTBIT 0x02 Y2w 9]:J  
#define SHIFTBIT 0x01 L;'+O u  
#pragma data_seg("shareddata") r$6z{Na\[  
HHOOK hHook =NULL; #oi4!%*M  
UINT nHookCount =0; fdCsn:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey . c+RFX@0  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT LeY\{w  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey HT5G HkT  
static int KeyCount =0; ])a?ri  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ]RQQg,|D  
#pragma data_seg() A[ZJS   
HINSTANCE hins; _#e='~;  
void VerifyWindow(); bI=\n)sEz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) z1F[okLA  
//{{AFX_MSG_MAP(CHookApp) -rlxxLT+  
// NOTE - the ClassWizard will add and remove mapping macros here. z$`=7 afp  
// DO NOT EDIT what you see in these blocks of generated code! s&M6DFlA  
//}}AFX_MSG_MAP Q/=L(_1l  
END_MESSAGE_MAP() pP)0 l  
/H,!7!6>?  
CHookApp::CHookApp() ~y^#?;  
{ U,+kV?Z  
 // TODO: add construction code here, EZc!QrY  
 // Place all significant initialization in InitInstance p/'C v  
} w=3@IW  
\p.Byso,  
CHookApp theApp; D C mNxN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) cu|#AW  
{ r+>E`GGQ  
 BOOL bProcessed=FALSE; KC? hsID{  
 if(HC_ACTION==nCode) [cru+c+O:  
 { /U6G?3b  
  if((lParam&0xc0000000)==0xc0000000){// Key up 5 8p_b  
   switch(wParam) _pKW($\  
   { -";'l @D=  
    case VK_MENU: VA)3=82n  
     MaskBits&=~ALTBIT; M:nXn7)+  
     break; o 1#XM/Z  
    case VK_CONTROL: sN 7I~  
     MaskBits&=~CTRLBIT; _4rb7"b1  
     break; L;5j hVy  
    case VK_SHIFT: =M 7FD  
     MaskBits&=~SHIFTBIT; QM9~O#rL  
     break; < 7zyRm@S  
    default: //judge the key and send message g^ ^%4Y  
     break; fh )QX  
   } @iy ^a  
   for(int index=0;index<MAX_KEY;index++){ )"jG)c^1*  
    if(hCallWnd[index]==NULL) }vxb, [#  
     continue; hX 9.%-@sR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0:h;ots'  
    { RoLUPy9U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ]^&DEj{  
     bProcessed=TRUE; <{YP=WYW  
    } hn.9j"  
   } AzN.vA)q  
  } \%E Zg  
  else if((lParam&0xc000ffff)==1){ //Key down :4<+)r26  
   switch(wParam) s>"=6gb  
   { 2sy{  
    case VK_MENU: vP3Fb;  
     MaskBits|=ALTBIT; l`gRw4 /$  
     break; Cr4shdN34  
    case VK_CONTROL: {mw,U[C  
     MaskBits|=CTRLBIT; H[<"DP  
     break; L1Fn;nR  
    case VK_SHIFT: q!""pr<n  
     MaskBits|=SHIFTBIT; ^Cyx "s't  
     break; x7l)i!/$  
    default: //judge the key and send message 2#*Bw=  
     break; g84~d(\?  
   } M[R, m_p  
   for(int index=0;index<MAX_KEY;index++) S]9:3~  
   { phbdV8$L  
    if(hCallWnd[index]==NULL) t_3)}  
     continue; zScV 9,H1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h^~eTi;c]Q  
    { ~0|~Fg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L`x:Y>C(  
     bProcessed=TRUE; _"a(vfl#  
    } \@['V   
   } ^gH.5L0]gH  
  } phl5E:fIKx  
  if(!bProcessed){ }^?dK3~q  
   for(int index=0;index<MAX_KEY;index++){ 68Wm=j.m  
    if(hCallWnd[index]==NULL) 6H VS0  
     continue; v=i[s  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 7SXi#{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); |j^>6nE  
   } (Y, @-V  
  } 11X-X  
 } y$*Tbzp  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /.$n>:XR  
} @6 gA4h  
N ^h,[  
BOOL InitHotkey() z mrk`o~  
{ =:6Y<ftC  
 if(hHook!=NULL){ &]pW##  
  nHookCount++; TxN#3m?G  
  return TRUE; A:p7\Kp;5}  
 } 5^GUuFt5m  
 else H=Yl @  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 5$GE3IER8  
  if(hHook!=NULL) }/(fe`7:  
   nHookCount++; ?*4&Z.~J  
  return (hHook!=NULL); YqR MVWcnk  
} }3lM+]pf  
BOOL UnInit() m {_\@'q  
{ vay_QxB5  
 if(nHookCount>1){ (IIOKx_  
  nHookCount--; d|j3E  
  return TRUE; 26 o68U8&y  
 } ` B : Ydf  
 BOOL unhooked = UnhookWindowsHookEx(hHook); A37Z;/H~k  
 if(unhooked==TRUE){ 3,oFT   
  nHookCount=0; AJ^9[j}  
  hHook=NULL; pL.r 9T.  
 } S<88>|&n]  
 return unhooked; Nypa,_9}  
} m,Q<4'  
H:,rNaz7D^  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) jp=^$rS6[  
{ x?va26FV  
 BOOL bAdded=FALSE; bH3-#mw5w  
 for(int index=0;index<MAX_KEY;index++){ ?%;7k'0"  
  if(hCallWnd[index]==0){ %Ni)^   
   hCallWnd[index]=hWnd; i?qS8h{  
   HotKey[index]=cKey; 9d#-;qV  
   HotKeyMask[index]=cMask; HR\yJt  
   bAdded=TRUE; < I8hy$+6  
   KeyCount++; {/XzIOO;b  
   break; p!|Wp  
  } >Ah [uM  
 } Eae]s8ek9  
 return bAdded; N=zrY`Vd  
} 3)atqM)i  
%:N5k+}  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) L:XnW 1(Or  
{ oSx]wZZ  
 BOOL bRemoved=FALSE; _9Iz'-LgB  
 for(int index=0;index<MAX_KEY;index++){ BNQ~O^R0  
  if(hCallWnd[index]==hWnd){ Rzj5B\+Rk(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ A$;U*7TJuO  
    hCallWnd[index]=NULL; eMPi ho  
    HotKey[index]=0; fg*IHha  
    HotKeyMask[index]=0; p r(:99~3  
    bRemoved=TRUE; tL 3]9qfj  
    KeyCount--; %^2LTK(P  
    break; *]W{83rXQ  
   } LUHj3H  
  } =>)l6**UE  
 } \n6#D7OV  
 return bRemoved; 9p+DA s{i  
} CbS- Rz:  
,wlF n  
void VerifyWindow() XcR2]\  
{ (O\5gAx  
 for(int i=0;i<MAX_KEY;i++){  zy  
  if(hCallWnd!=NULL){ $FNj>1  
   if(!IsWindow(hCallWnd)){ 8}XtVF;  
    hCallWnd=NULL; g9<*+fV 2$  
    HotKey=0; }_@*,  
    HotKeyMask=0; 9=ns.r  
    KeyCount--; U;`N:~|p#  
   } r_@;eh  
  } M// q7SHh  
 } -3_-n*k!  
} )0j^Fq5[+  
">v76%>Z7  
BOOL CHookApp::InitInstance() =v:vc~G6  
{ Ra%RcUf~sh  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ;Lu%v%BM  
 hins=AfxGetInstanceHandle(); aiF7\^aw$  
 InitHotkey(); -ce N}Cb3  
 return CWinApp::InitInstance(); .Quu_S_ vH  
} i,8h B(M!  
; "ux{ .  
int CHookApp::ExitInstance() =;l .<{<VH  
{ A Ns.`S  
 VerifyWindow(); 4fT,/[k?  
 UnInit(); JLT10c3  
 return CWinApp::ExitInstance(); I ^?TabL  
} Z[)t34EY"  
|j^^ *z@  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file g1@zk $  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q]S~H+eRy  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ l<ag\ d  
#if _MSC_VER > 1000 ]e$mTRi*  
#pragma once M/EEoK^K@  
#endif // _MSC_VER > 1000 )iNM jg  
9s>q4_D  
class CCaptureDlg : public CDialog WldlN?[j  
{ }rj.N98  
 // Construction 4c_TrNwP  
 public: ~pO6C*"  
  BOOL bTray; yH|[K=?S[  
  BOOL bRegistered; 9E'fM  
  BOOL RegisterHotkey(); e=<knKc Q  
  UCHAR cKey; GPONCL8(0  
  UCHAR cMask; E2 Q[  
  void DeleteIcon(); yS^";$2Tc  
  void AddIcon(); mKugb_d?  
  UINT nCount; b|^g51v  
  void SaveBmp(); umaF}}-Q{  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Dq/_^a/1  
  // Dialog Data v8Vw.Ce`f  
  //{{AFX_DATA(CCaptureDlg) N7Kq$G2O  
  enum { IDD = IDD_CAPTURE_DIALOG }; ]P;uQ!  
  CComboBox m_Key; |_"JyGR2  
  BOOL m_bControl; >v7fR<(%s  
  BOOL m_bAlt; 5^<X:1J$  
  BOOL m_bShift; EiQX* v  
  CString m_Path; 9utiev~3  
  CString m_Number; ![h+ R@_(  
  //}}AFX_DATA pM],-7UM  
  // ClassWizard generated virtual function overrides 'r~,~A I  
  //{{AFX_VIRTUAL(CCaptureDlg) IFcxyp  
 public: 8n+&tBq1  
  virtual BOOL PreTranslateMessage(MSG* pMsg); L.ScC  
 protected: ]VtVw^ir  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mk(O..)2  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ajC'C!"^Ty  
  //}}AFX_VIRTUAL Px{Cvc  
  // Implementation M<s16  
 protected: 4[m})X2(  
  HICON m_hIcon; /j/,@,lw7z  
  // Generated message map functions Veo*-sl  
  //{{AFX_MSG(CCaptureDlg) a8ya5EO  
  virtual BOOL OnInitDialog(); I@Pp[AyG  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); -sO[,  
  afx_msg void OnPaint(); sU!h^N$  
  afx_msg HCURSOR OnQueryDragIcon(); 7#d>a=$h  
  virtual void OnCancel(); cyrVz4_a  
  afx_msg void OnAbout(); Yv<' QC  
  afx_msg void OnBrowse(); ]L+YnZ?6  
  afx_msg void OnChange(); PP)iw@9j  
 //}}AFX_MSG RfH.WXi  
 DECLARE_MESSAGE_MAP() ~QgyhJM_h=  
}; TRP#b 7nC  
#endif q.0Evr:  
!~Vo'ykwx'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4<}!+X7m  
#include "stdafx.h" > %h7)}U  
#include "Capture.h" 8=QOp[w   
#include "CaptureDlg.h" /kV3[Rw+  
#include <windowsx.h> z"#iG&>a,  
#pragma comment(lib,"hook.lib") )3K#${p  
#ifdef _DEBUG .c__<I<G<  
#define new DEBUG_NEW E Q 'L"  
#undef THIS_FILE tpu2e*n-|  
static char THIS_FILE[] = __FILE__; URU,&gy=  
#endif 0U|t@&q  
#define IDM_SHELL WM_USER+1 j/.$ (E   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \ #<.&`8B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); EQe!&;   
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; "NEg]LB5  
class CAboutDlg : public CDialog .5L|(B=H  
{ s?Lx\?T  
 public: >QyJRMY  
  CAboutDlg(); loRT+u$&  
  // Dialog Data H<_BnT #  
  //{{AFX_DATA(CAboutDlg) dbn9t7'{  
  enum { IDD = IDD_ABOUTBOX }; L\0;)eJ#M  
  //}}AFX_DATA  N>ncv  
  // ClassWizard generated virtual function overrides w>#{Nl7gz  
  //{{AFX_VIRTUAL(CAboutDlg) ]oT8H?%*Y  
 protected: Dz d[<Qln  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support n/W@H Im#  
  //}}AFX_VIRTUAL [|iWLPO1&k  
  // Implementation L& =a(  
 protected: }9:( l  
  //{{AFX_MSG(CAboutDlg) d}D%%noIu  
  //}}AFX_MSG \Ui3=8(  
  DECLARE_MESSAGE_MAP() k;5$]^x  
}; 42/MBP`\Y  
(rKyX:Vsy  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) {!RDb'Zp  
{ f3yH4r?;w  
 //{{AFX_DATA_INIT(CAboutDlg) F/pq9  
 //}}AFX_DATA_INIT /ILj}g'  
} OlU')0Y  
->Z9j(JU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) nm"]q`(K  
{ uu7 ?,WT  
 CDialog::DoDataExchange(pDX); ),{v  
 //{{AFX_DATA_MAP(CAboutDlg) r ^=rs!f@  
 //}}AFX_DATA_MAP EPEWyGw  
} 8y:/!rRN  
;x<5F+b  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) j1zrjhXI  
 //{{AFX_MSG_MAP(CAboutDlg) jY;T:C-T  
 // No message handlers Wd`*<+t]  
 //}}AFX_MSG_MAP cNbH:r"Ay  
END_MESSAGE_MAP() oW}nr<G{<  
} 6 ,m2u  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) n[S-bzU^t  
: CDialog(CCaptureDlg::IDD, pParent) \;XDPC j  
{ VSx9aVPkC  
 //{{AFX_DATA_INIT(CCaptureDlg) 5!QT }Um  
  m_bControl = FALSE; yv[3&E?  
  m_bAlt = FALSE; ]& 8c 45c  
  m_bShift = FALSE; ~];r{IU  
  m_Path = _T("c:\\"); 'FNnFm  
  m_Number = _T("0 picture captured."); p9>{X\eT:  
  nCount=0; ]I,(^Xq3a(  
  bRegistered=FALSE; GB%kxtGD;\  
  bTray=FALSE; s5bqS'%  
 //}}AFX_DATA_INIT 3_bE12  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ZLjEH7  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); SFu]*II;{  
} FR9w0{o  
HNJR&U t  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) }SfS\b{|~  
{ noNJ+0S  
 CDialog::DoDataExchange(pDX); M)F_$ ICE-  
 //{{AFX_DATA_MAP(CCaptureDlg) c,2OICj  
  DDX_Control(pDX, IDC_KEY, m_Key); tJG+k)EE  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); g6 H}a  
  DDX_Check(pDX, IDC_ALT, m_bAlt); mjQZ"h0  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 3S5`I9I  
  DDX_Text(pDX, IDC_PATH, m_Path); ! k[JP+;  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *{_N*p\{  
 //}}AFX_DATA_MAP ^h$^j  
} [vGkr" =  
O~Jm<  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) u^O!5 'D%  
//{{AFX_MSG_MAP(CCaptureDlg) X-=4Z9  
 ON_WM_SYSCOMMAND() 3F?7oMNIh  
 ON_WM_PAINT() 0BwxPD#6bv  
 ON_WM_QUERYDRAGICON() p4F%FS:`  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) xH\!j  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) eJ*u]GH U  
 ON_BN_CLICKED(ID_CHANGE, OnChange) t$Bu<frQ  
//}}AFX_MSG_MAP q+znb'i-x  
END_MESSAGE_MAP() 8(Cs<C!  
XS}-@5TI  
BOOL CCaptureDlg::OnInitDialog() 216`rQ}z  
{ 2Z-[x9t  
 CDialog::OnInitDialog(); "MvSF1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); nt]'>eX_}  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y{Ff I+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `h|Y0x  
 if (pSysMenu != NULL) Z%Pv,h'Q  
 { 6b7c9n Z  
  CString strAboutMenu; +/[L-&,  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 4tEAi4H|`@  
  if (!strAboutMenu.IsEmpty()) `;=-71Gn~  
  { p[O\}MAd#  
   pSysMenu->AppendMenu(MF_SEPARATOR); 86pA+c+U  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);  0ij YE  
  } %aI,K0\  
 } i zYC0T9  
 SetIcon(m_hIcon, TRUE); // Set big icon J(G-c5&=  
 SetIcon(m_hIcon, FALSE); // Set small icon y| 0!sNg  
 m_Key.SetCurSel(0); <vE|QxpR  
 RegisterHotkey(); yH(3 m#  
 CMenu* pMenu=GetSystemMenu(FALSE); zs(P2$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); o}&{Y2!x  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m-qu<4A/U|  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); d8uDSy  
 return TRUE; // return TRUE unless you set the focus to a control ]K3bDU~  
} .kU}x3m  
V'tqsKQ!  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q;lR|NOh  
{ (rc 7Cp3  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 8(Q|[  
 { [_KV;qS%/  
  CAboutDlg dlgAbout; S n<X   
  dlgAbout.DoModal(); m68>`  
 } a/v]E]=qI  
 else E/hT/BOPK  
 { ymp ik.'  
  CDialog::OnSysCommand(nID, lParam); A/"<o5(T(P  
 } |ZM>UJ  
}  @M OaXe  
52 *ii  
void CCaptureDlg::OnPaint() \#PZZH%  
{ diNAT`|?#  
 if (IsIconic()) }$'XV.  
 { bSz@@s.  
  CPaintDC dc(this); // device context for painting V%{WH}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ')}itS8  
  // Center icon in client rectangle {+ Ibi{  
  int cxIcon = GetSystemMetrics(SM_CXICON); 0~EGrEt  
  int cyIcon = GetSystemMetrics(SM_CYICON); s3T7M:DM4  
  CRect rect; [K@(,/$  
  GetClientRect(&rect); c|d,:u#  
  int x = (rect.Width() - cxIcon + 1) / 2; '7pzw>E=:  
  int y = (rect.Height() - cyIcon + 1) / 2; RH:vd|q+  
  // Draw the icon <@# g2b  
  dc.DrawIcon(x, y, m_hIcon); Y]=k"]:%  
 } "hQGk  
 else cRMyYdJ o  
 { : h(Z\D_  
  CDialog::OnPaint(); gkX7,J-0  
 } 0VrsbkS  
} {n&n^`Em  
Z)IF3{*  
HCURSOR CCaptureDlg::OnQueryDragIcon() (t\U5-w  
{ IRdR3X56  
 return (HCURSOR) m_hIcon; 6O/c%1VHA3  
} )Fp$ *]|  
S8B?uU  
void CCaptureDlg::OnCancel() ?E_;[(Mcr  
{ nbB*d@"  
 if(bTray) J2 /19'QE  
  DeleteIcon(); 7AS_Aw1L  
  CDialog::OnCancel(); 98)C 7N'  
} xmEom  
Y+o\?|q-E  
void CCaptureDlg::OnAbout() $M j\ 3  
{ UM#.`  
 CAboutDlg dlg; S*>T%#F6Uo  
 dlg.DoModal(); NM^uP+uS  
} wx[m-\  
~#4FL<W  
void CCaptureDlg::OnBrowse() 8MI8~  
{ uO-|?{29  
 CString str; ,[T/O\k  
 BROWSEINFO bi;  \m~p;B  
 char name[MAX_PATH]; *sZH3:  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zd)QCq  
 bi.hwndOwner=GetSafeHwnd(); DRR)mQBb  
 bi.pszDisplayName=name; Y8^ WuN$  
 bi.lpszTitle="Select folder"; j#2E Q  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; u]7wd3(  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); a??8)=0|}  
 if(idl==NULL) AC'_#nPL#  
  return; ^a`3)WBv8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ue60Mf  
 str.ReleaseBuffer(); ;2\6U;  
 m_Path=str; W8$0y2  
 if(str.GetAt(str.GetLength()-1)!='\\') 122s 7A  
  m_Path+="\\"; dCS f$5  
 UpdateData(FALSE); ]jm:VF]4  
} ?]D))_|G  
utBrH  
void CCaptureDlg::SaveBmp() Ef?hkq7X<  
{ 7)Vbp--b#  
 CDC dc; iF MfBg  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); nT}Wx/aT  
 CBitmap bm; F81EZ/  
 int Width=GetSystemMetrics(SM_CXSCREEN); i9De+3VqKK  
 int Height=GetSystemMetrics(SM_CYSCREEN); @&E IH,c  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,Pcg+^A  
 CDC tdc; [FrLxU  
 tdc.CreateCompatibleDC(&dc); czU"  
 CBitmap*pOld=tdc.SelectObject(&bm); V2`Ud[  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `Fo/RZOW  
 tdc.SelectObject(pOld); AoOA.t6RVo  
 BITMAP btm; d@1^U9sf  
 bm.GetBitmap(&btm); 0IdA!.|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; H8[A*uYL  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); uSRhIKy  
 BITMAPINFOHEADER bih; A)3H`L  
 bih.biBitCount=btm.bmBitsPixel; ,OubKcNg  
 bih.biClrImportant=0; <qpzs@  
 bih.biClrUsed=0; R3U|{vgl  
 bih.biCompression=0; @!'}=?`  
 bih.biHeight=btm.bmHeight; 3(\D.Z  
 bih.biPlanes=1; @y~kQ5k  
 bih.biSize=sizeof(BITMAPINFOHEADER); Uavl%Q  
 bih.biSizeImage=size; PU,$YPrZ  
 bih.biWidth=btm.bmWidth; X?[ )e  
 bih.biXPelsPerMeter=0; CYQ)'v  
 bih.biYPelsPerMeter=0; G%: 3.:E"  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); N) _24  
 static int filecount=0; 7L6L{~8 W  
 CString name; A"&<$5Q  
 name.Format("pict%04d.bmp",filecount++); Xpn\TD<_I  
 name=m_Path+name; [2Zy~`*y{  
 BITMAPFILEHEADER bfh; xlJWCA*>  
 bfh.bfReserved1=bfh.bfReserved2=0; M /v@C*c  
 bfh.bfType=((WORD)('M'<< 8)|'B'); !rr,(!Ip?O  
 bfh.bfSize=54+size; hL6;n*S=  
 bfh.bfOffBits=54; ~gff{Nzk  
 CFile bf; o h\$u5  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ %+Ze$c}X  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Iq4B%xo6G  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); }.E^_`  
  bf.WriteHuge(lpData,size); ,0,FzxX0!  
  bf.Close(); =WW5H\?  
  nCount++; $.,B2}'  
 } hEu_mw#  
 GlobalFreePtr(lpData); 0V>Ho H   
 if(nCount==1) 5!fYTo|G>  
  m_Number.Format("%d picture captured.",nCount); ) c\Y!vS  
 else J](NCD  
  m_Number.Format("%d pictures captured.",nCount); 65qqs|&w;[  
  UpdateData(FALSE); _Iav2= 0Wi  
} } v:YSG  
Zs=A<[  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) NT.#U?9c  
{ &xN+a{&  
 if(pMsg -> message == WM_KEYDOWN) QJ4$) Fr(  
 { `3i>e<m~  
  if(pMsg -> wParam == VK_ESCAPE) $1|E(d1  
   return TRUE; Vez8 ~r3  
  if(pMsg -> wParam == VK_RETURN) N;'c4=M~(  
   return TRUE;  jK]1X8  
 } 2{63:f1c`'  
 return CDialog::PreTranslateMessage(pMsg); 0jlM~H  
} n.2:fk  
j\~,Gtn>Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =FhP$r*  
{ \8QOZjy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?l?l<`sTO  
  SaveBmp(); =3-?$  
  return FALSE; Y06^M?}  
} aF^N  Ye  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ h Fv{?v  
 CMenu pop; ~>u| 7 M$(  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); I{g.V|+ x  
 CMenu*pMenu=pop.GetSubMenu(0); ApeqbD5g&  
 pMenu->SetDefaultItem(ID_EXITICON); IoLi7NKw  
 CPoint pt; s__xBY  
 GetCursorPos(&pt); sV a0eGc  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;un@E:  
 if(id==ID_EXITICON) z80P5^9  
  DeleteIcon(); bc'IoD/  
 else if(id==ID_EXIT) 2wY|E<E  
  OnCancel(); ,.QJ S6Yv  
 return FALSE; 8.B'O>\T  
} G5/A {1sz&  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2@6@|jRG  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) `_OrBu[  
 AddIcon(); 8A3/@Z;0S  
 return res; #\lvzMjCC  
} `/>kN%  
ylZQwICk  
void CCaptureDlg::AddIcon() >pfeP"[(3  
{ J@I>m N1\  
 NOTIFYICONDATA data; ;(/go\m tB  
 data.cbSize=sizeof(NOTIFYICONDATA); N,Ma\D+^t  
 CString tip; ErK1j  
 tip.LoadString(IDS_ICONTIP); -t|/g5.w_  
 data.hIcon=GetIcon(0); 0d_)C>gcF  
 data.hWnd=GetSafeHwnd(); }OAU5P!rp  
 strcpy(data.szTip,tip); hbx4[Pf  
 data.uCallbackMessage=IDM_SHELL; Cj8&wz}ez  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; `w:kY9  
 data.uID=98; 9hIKx:XCg  
 Shell_NotifyIcon(NIM_ADD,&data); Ldz]FB|  
 ShowWindow(SW_HIDE); !2Nk  
 bTray=TRUE; xjo`u:BH  
} Deh3Dtg/k  
fYk>LW  
void CCaptureDlg::DeleteIcon() W7!gD  
{ KM?4J6jH  
 NOTIFYICONDATA data; /#Aw7F$Ey  
 data.cbSize=sizeof(NOTIFYICONDATA); ~T RC-H  
 data.hWnd=GetSafeHwnd(); uH9Vj<E$K  
 data.uID=98; O0qG 6a  
 Shell_NotifyIcon(NIM_DELETE,&data); [G|.  
 ShowWindow(SW_SHOW); ``WTg4C(Y  
 SetForegroundWindow(); n]IF`kYQV  
 ShowWindow(SW_SHOWNORMAL); }Kgi!$<aQx  
 bTray=FALSE; ~o^|>]  
} H:~p5t  
9u( pn`e 3  
void CCaptureDlg::OnChange() 1PwtzH .w  
{ 7 <^+)DsS?  
 RegisterHotkey(); 2 L4[~>  
} \yJ 4+vo2Q  
DPzW,aIgv  
BOOL CCaptureDlg::RegisterHotkey() )sm9%|.&  
{ hc|A:v)]  
 UpdateData(); NlEyT9  
 UCHAR mask=0; ~{Iw[,MJ  
 UCHAR key=0; CXrOb+  
 if(m_bControl) c6xr[tc%  
  mask|=4; cpa" ,8  
 if(m_bAlt) '\#q7YjaL  
  mask|=2; IEy$2f>Ns  
 if(m_bShift) YP02/*'  
  mask|=1; aA|{r/.10K  
  key=Key_Table[m_Key.GetCurSel()]; %[p*6&V  
 if(bRegistered){ `}),wBq  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); zVS{X=u  
  bRegistered=FALSE; g9pKoi|\E  
 } 6m;>R%S_  
 cMask=mask; *m"9F'(Sd  
 cKey=key; 9xK>fM&u  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @n)? =[p  
 return bRegistered; / 3N2?zS{  
} {S=<(A @  
uQO5GDuK>  
  四、小结 5qnei\~  
}gv'r ";  
  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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