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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: V$<G)dwUG5  
  o9LD6$  
  一、实现方法 //M4Sq(  
%DRy&k/T  
  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: 2^ bpH%  
pR6A#DgB  
#pragma data_seg("shareddata") '}+X,Usm  
HHOOK hHook =NULL; //钩子句柄 ^ wF@6e7/&  
UINT nHookCount =0; //挂接的程序数目 Q^Z<RA(C  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ?>.g;3E$  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 _'hCUXeY'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey KTK6#[8A  
static int KeyCount =0; DV[ Jbl:)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 @`;Y/',  
#pragma data_seg() W B*`zCM  
5Ue^>8-  
  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。 v^],loi<V  
6G<Hi"I  
  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: Cre0e$ a  
RpXs3=9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR nn)`eR&  
cKey,UCHAR cMask) /GuS IZg"_  
{ ;2Ad])  
 BOOL bAdded=FALSE; ju^"vw  
 for(int index=0;index<MAX_KEY;index++){ TFC!u 0Y"$  
  if(hCallWnd[index]==0){ rZ.a>'T4  
   hCallWnd[index]=hWnd; 2b4pOM7W  
   HotKey[index]=cKey; J7?)$,ij%  
   HotKeyMask[index]=cMask; C*s0r;  
   bAdded=TRUE; rF'^w56  
   KeyCount++;  LbV]JP  
   break; %V%#y $l  
  } c,+(FQ9  
 } F%.9f Uo  
 return bAdded; *2Vp4  
} &Ev]x2YC  
//删除热键 Kcw1uLb  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;V"yMWjc  
{ o ?va#/fk  
 BOOL bRemoved=FALSE; CS;W)F  
 for(int index=0;index<MAX_KEY;index++){ 4ljvoJ}xjr  
  if(hCallWnd[index]==hWnd){ ]\a\6&R  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B) *#g  
    hCallWnd[index]=NULL; }&(E#*>x  
    HotKey[index]=0; EK8E  
    HotKeyMask[index]=0; Q Bfhyo_  
    bRemoved=TRUE; qsft*&  
    KeyCount--; ^EUOmVN  
    break; LN.Bd,  
   } *K}z@a_  
  } cPx ~|,)l  
 } \ L9?69B~  
 return bRemoved; _ 7BF+*T  
} nG},v%  
6>=-/)p}  
$ o5V$N D  
  DLL中的钩子函数如下: ?K4.L?D#J  
I[g?Ju >  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) :^H9W^2  
{ Zc4(tf9  
 BOOL bProcessed=FALSE; 17 i<4f#  
 if(HC_ACTION==nCode) z<o E!1St  
 { t*Vao  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d^Zo35X  
   switch(wParam) B_."?*|w  
   {  BP[CR1Gs  
    case VK_MENU: N;C"X4 rV  
     MaskBits&=~ALTBIT; @Z9>3'2]A  
     break; W( &Go'9e"  
    case VK_CONTROL: ^I(oy.6?=p  
     MaskBits&=~CTRLBIT; agU%z:M{  
     break; N"YK@)*Q  
    case VK_SHIFT: n&0mz1rw  
     MaskBits&=~SHIFTBIT; ~{7zm"jN  
     break; {WYu 0J@  
    default: //judge the key and send message hF{x')(#l  
     break; jU]]:S4xD/  
   } YW?7*go'Z  
   for(int index=0;index<MAX_KEY;index++){ {k_ PMl0G  
    if(hCallWnd[index]==NULL) K2x6R  
     continue; d,Cz-.'sOf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0a2$P+p  
    { 7m|`tjQ1  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); @4 /~~  
     bProcessed=TRUE; zj~nnfoys  
    } io9y; S"+  
   } !paN`Fz\a  
  } .N5h V3  
  else if((lParam&0xc000ffff)==1){ //有键按下 i"%JFj_G  
   switch(wParam) u Q[vgNe*m  
   { wO^$!zB W  
    case VK_MENU: i7S>RB  
     MaskBits|=ALTBIT; .)i O Du  
     break; f$1Gu  
    case VK_CONTROL: CN\|_y  
     MaskBits|=CTRLBIT; hsTFAfa'  
     break; }mKGuCoH>  
    case VK_SHIFT: l-<3{!  
     MaskBits|=SHIFTBIT; 22)0zY%\  
     break; D'7A2f  
    default: //judge the key and send message yxaT7Oqh%  
     break; <X:Ud&\  
   } b4Ricm  
   for(int index=0;index<MAX_KEY;index++){ 6 WA|'|}=  
    if(hCallWnd[index]==NULL) F^.om2V|9  
     continue; ki;!WhF~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BW'L.*2  
    { wXr>p)mP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); cm@jt\D  
     bProcessed=TRUE; i{TIm}_\  
    } bK ?1MiXb  
   } Y3vX)D}  
  } 1YJ_1VJ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 DNm(:%)0  
   for(int index=0;index<MAX_KEY;index++){ u iBl#J Q  
    if(hCallWnd[index]==NULL) |7svA<<[  
     continue; vC{ h2A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) \ V[;t-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \@Ee9C 13  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p&i. )/  
   } Pv< QjY  
  } M0cd-Dn  
 } ~ A^E  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G;2R]H#p  
} F;IP3tD  
mSU@UD|'  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: >%9^%p^  
J?._/RL8-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lbQ6 a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); AI&qU/}  
1i4WWK7k  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: yJDeX1+,  
dv"as4~%  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f'1(y\_fb  
{ %9t{Z1$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) {I4%   
 { 5JS ZLC  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 xLA~1ZSVJw  
  SaveBmp(); } sf YCz  
  return FALSE; )HEfU31IC  
 } WHp97S'd  
 …… //其它处理及默认处理 TNh=4xQ}  
} vTpStoUM  
X.s*>'  
JT4wb]kdV  
  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。 JDkCUN5  
:~vxZ*a  
  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。 "Owct(9  
rVUUH!  
  二、编程步骤 hdo&\Q2D8  
^`tk/#h\9F  
  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"; >eQbipn  
[-4KY4R  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ITVQLQ  
}x]&L/  
  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; ypH8QfxLTr  
VLiIO"u;  
  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; 9*4 .  
/$;,F't#2M  
  5、 添加代码,编译运行程序。 #S%4?   
& B}Lo  
三、程序代码 E_~x==cb  
Yg/}ghF\  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL q7|:^#{av  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) J5;5-:N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ xZX`%f-  
#if _MSC_VER > 1000 s8^~NX(xdy  
#pragma once 88 {1mA,v  
#endif // _MSC_VER > 1000 (/&;jV2DD[  
#ifndef __AFXWIN_H__ ^ pj>9%  
#error include 'stdafx.h' before including this file for PCH qB:AkMd&  
#endif ,I ZqLA  
#include "resource.h" // main symbols .hKhrcQp  
class CHookApp : public CWinApp 'qjX$]H  
{ 'fIHUw|  
 public: rOW;yJ[  
  CHookApp(); Kv}k*A% S  
  // Overrides %4,xx'`  
  // ClassWizard generated virtual function overrides e8oKn&  
  //{{AFX_VIRTUAL(CHookApp) f e|g3>/|  
 public: S.: 7k9  
  virtual BOOL InitInstance(); 6JSY56v  
  virtual int ExitInstance(); EJ`Q8uz  
  //}}AFX_VIRTUAL :/6()_>bO  
  //{{AFX_MSG(CHookApp) s _~IZ%+<.  
  // NOTE - the ClassWizard will add and remove member functions here. A#(`9  
  // DO NOT EDIT what you see in these blocks of generated code ! q]TqI' o  
  //}}AFX_MSG bw9 nB{C<  
  DECLARE_MESSAGE_MAP() ]BfS270  
}; vs +QbI6>-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); -j&Vtr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fp{G|.SA  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8.yCA  
BOOL InitHotkey(); za T_d/?J  
BOOL UnInit(); 1fY>>*oP  
#endif )|pU.K9qZ  
jJia.#.Ze  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. qz`rL#W]  
#include "stdafx.h" Q/py qe G  
#include "hook.h" qEQAn/&  
#include <windowsx.h> \]8VwsP  
#ifdef _DEBUG } ~F~hf>s  
#define new DEBUG_NEW `a >?UUT4  
#undef THIS_FILE -(9O6)Rs$  
static char THIS_FILE[] = __FILE__; 7Lg7ei2mN7  
#endif \,R!S/R#  
#define MAX_KEY 100 MU1E_"Z)  
#define CTRLBIT 0x04 F;P5D<  
#define ALTBIT 0x02 - IU4#s  
#define SHIFTBIT 0x01 o\4CoeG  
#pragma data_seg("shareddata") BxdX WO  
HHOOK hHook =NULL; zJY']8ah  
UINT nHookCount =0; w>[T&0-N  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $3k "WlRG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT n(>C'<otj  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey &RW`W)0;  
static int KeyCount =0; 2bLI%gg3  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 2 z7}+lH  
#pragma data_seg() Lc]1$  
HINSTANCE hins; 2Lfah?Tx~C  
void VerifyWindow(); fQU{SjG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) tuxRVV8l  
//{{AFX_MSG_MAP(CHookApp) v L}T~_=3  
// NOTE - the ClassWizard will add and remove mapping macros here. tuLH}tkNY  
// DO NOT EDIT what you see in these blocks of generated code! u1^\MVO8  
//}}AFX_MSG_MAP ?YBaO,G9o  
END_MESSAGE_MAP() ]g,lRG  
*~2cG;B"e  
CHookApp::CHookApp() Pu;yEh  
{ uw33:G  
 // TODO: add construction code here, t'g^W  
 // Place all significant initialization in InitInstance mb1Vu  
} % 5z gd>  
HCj> ,^<h  
CHookApp theApp; mI"D(bx\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ` 1+%}}!$u  
{ w"8V0z  
 BOOL bProcessed=FALSE; ~}Z'0W)Q`z  
 if(HC_ACTION==nCode) :, _!pe;H  
 { TQc@lR!  
  if((lParam&0xc0000000)==0xc0000000){// Key up /e1(? 20  
   switch(wParam) !D:Jbt@R<n  
   { _ym"m,,7?  
    case VK_MENU: |4mVT&63(  
     MaskBits&=~ALTBIT; c)~h<=)  
     break; aSL6zye ,  
    case VK_CONTROL: (0L=AxH  
     MaskBits&=~CTRLBIT; vtyx`F f  
     break; [T^?Q%h  
    case VK_SHIFT: dJD(\a>r.u  
     MaskBits&=~SHIFTBIT; &| !B!eOY  
     break; iZxt/}1X0  
    default: //judge the key and send message 1nI^-aQ3  
     break; 3^wC<ZXcD  
   } M0w/wt|  
   for(int index=0;index<MAX_KEY;index++){ {C")#m-0  
    if(hCallWnd[index]==NULL) y=Q!-~5|fF  
     continue; E\M-k\cSj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) C:i|-te  
    { @i LIU}+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +,5-qm)Gh>  
     bProcessed=TRUE; rs]I  
    } Lm6**v  
   } u =J&~  
  } h@1!T  
  else if((lParam&0xc000ffff)==1){ //Key down <)U4Xz?  
   switch(wParam) .H~YI  
   { 7\Fs=\2l+'  
    case VK_MENU: b>11h  
     MaskBits|=ALTBIT; fS=hpL6]@  
     break; iw\%h9  
    case VK_CONTROL: LFf`K)q  
     MaskBits|=CTRLBIT; QyGnDomQ  
     break; <9eu1^g  
    case VK_SHIFT: zT#`qCbT'J  
     MaskBits|=SHIFTBIT; nidr\oFUIn  
     break; 0* F}o)n/m  
    default: //judge the key and send message i9A~<  
     break; _#C()Ro*P  
   } Kq)MTlP0g  
   for(int index=0;index<MAX_KEY;index++) KzO,*M  
   { j0mM>X HB  
    if(hCallWnd[index]==NULL) lAi2,bz"  
     continue; "G?Yrh  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :50b8  
    { }dYBces  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2+Rv{%  
     bProcessed=TRUE; }}r> K}  
    } FN^FvQ  
   } GP a`e  
  } PaWr[ye  
  if(!bProcessed){ k)7{Y9_No  
   for(int index=0;index<MAX_KEY;index++){ X}A'Cg0y  
    if(hCallWnd[index]==NULL) V/%~F6e  
     continue; V diJ>d[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) #FH[hRo=6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); v=?2S  
   } s?C&s|'.  
  } -e]7n*}H$  
 } e0HfP v_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F0lOlS   
} HM9fjl[  
ej(ikj~j  
BOOL InitHotkey() <AoXEu D  
{ I)SG wt-  
 if(hHook!=NULL){ J n&7C  
  nHookCount++; @)6jE!LC  
  return TRUE; pv,45z0  
 } 5h{`<W  
 else +-$Ko fnM  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); h6D^G5i  
  if(hHook!=NULL) BS 1Ap  
   nHookCount++; B.dT)@Lx0  
  return (hHook!=NULL); 1;F`c`0<  
} vVxD!EL  
BOOL UnInit() s1j{x&OSq  
{ g(E"4M@t!  
 if(nHookCount>1){ t^tmz PWA  
  nHookCount--; gm"#:< )  
  return TRUE; b #fTAC;<  
 } Ea $aUORm  
 BOOL unhooked = UnhookWindowsHookEx(hHook); WT\<.Py  
 if(unhooked==TRUE){ 23]Y<->Eu<  
  nHookCount=0; OF U/gaO~  
  hHook=NULL; {KL5GowH  
 } 60>.ul2  
 return unhooked; Vu8,(A7D%O  
} !wz/c M;  
s>n(`?@L  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T^.Cc--c  
{ =/0=$\Ws  
 BOOL bAdded=FALSE; S.*~C0"  
 for(int index=0;index<MAX_KEY;index++){ e^1uVN  
  if(hCallWnd[index]==0){  |a^U]  
   hCallWnd[index]=hWnd; '@nbqM  
   HotKey[index]=cKey; LW)H"6v  
   HotKeyMask[index]=cMask; 2{|$T2?e  
   bAdded=TRUE; {Qu"%h.Al  
   KeyCount++; 2}U!:bn(  
   break; KzU lTl0  
  } muON> ^MbC  
 } GEUg]nw  
 return bAdded; %/%UX{8R  
} 0E`1HP"b  
V9NTs8LKc  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k?GD/$1t  
{ iA }vKQ  
 BOOL bRemoved=FALSE; w8Sv*K  
 for(int index=0;index<MAX_KEY;index++){ \*t~==WB  
  if(hCallWnd[index]==hWnd){ Y"g.IK`V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ,F6=b/eZ  
    hCallWnd[index]=NULL; Fg]?zEa  
    HotKey[index]=0; b \7iY&.C|  
    HotKeyMask[index]=0; 2BXy<BM @  
    bRemoved=TRUE; m"eteA,"k_  
    KeyCount--; )RgGcHT@  
    break; tz NlJ~E  
   } 5&Ts7& .  
  } =@x`?oev  
 } w4,Ag{t>  
 return bRemoved; o`S ?  
} OWq'[T4  
k44Q):ncY7  
void VerifyWindow() 5*%#o  
{ "UFs~S|e  
 for(int i=0;i<MAX_KEY;i++){ ] y{WD=T  
  if(hCallWnd!=NULL){ OPJ: XbG  
   if(!IsWindow(hCallWnd)){ Y$K!7Kq  
    hCallWnd=NULL; Cizvw'XDV  
    HotKey=0; igL<g  
    HotKeyMask=0; E>LkJSy=  
    KeyCount--; {y=W6uP  
   } >4` dy  
  } w'4AJ Q|;  
 } ]  ]U<UJ  
} Z4K+ /<I  
C BYX]  
BOOL CHookApp::InitInstance() PQmq5N6  
{ $lA V6I.  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); h"mi"H^o  
 hins=AfxGetInstanceHandle(); <yA}i"-1W  
 InitHotkey(); 38ES($  
 return CWinApp::InitInstance(); eDI= nSo  
} 8LkP)]4^sO  
q<W=#Sx  
int CHookApp::ExitInstance() W<ZK,kv  
{ ^>x|z.  
 VerifyWindow(); qVqRf.-\  
 UnInit(); u|#>32kV  
 return CWinApp::ExitInstance(); 4LcX<B U9  
} RprKm'b8x`  
/'2O.d0}.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ) /vhclkb  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 8F(h*e_?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ C;+(Zp  
#if _MSC_VER > 1000 @Hb'8F  
#pragma once ^)!F9h+  
#endif // _MSC_VER > 1000 \`<cH#  
.{KjEg 6  
class CCaptureDlg : public CDialog `?g`bN`Vn  
{ bu7'oB~:V^  
 // Construction n%^ LPD  
 public: Gc]~w D$  
  BOOL bTray; wm{3&m  
  BOOL bRegistered; moj ]j`P5a  
  BOOL RegisterHotkey(); UV 4>N  
  UCHAR cKey; gbeghLP[?  
  UCHAR cMask; /I5X"x  
  void DeleteIcon(); :AdDLpk3j  
  void AddIcon(); -~[9U,  
  UINT nCount; /^{BUo  
  void SaveBmp(); 7\z ZpPDV  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c\6+=\  
  // Dialog Data b i y4 d  
  //{{AFX_DATA(CCaptureDlg) *_Z#O,  
  enum { IDD = IDD_CAPTURE_DIALOG }; #ge)2  
  CComboBox m_Key; \@3Qi8u//  
  BOOL m_bControl; 9Ya<My  
  BOOL m_bAlt; 1 2++RkL#  
  BOOL m_bShift; &;,,H< p  
  CString m_Path; UUKP"  
  CString m_Number; LH 3}d<{  
  //}}AFX_DATA p9U?!L!y  
  // ClassWizard generated virtual function overrides r=/;iH?UH  
  //{{AFX_VIRTUAL(CCaptureDlg) aJL^AG  
 public: 4(neKr5\#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); =p^He!  
 protected: jr7C}B-Fb^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B_U{ s\VY  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); FsB^CxVg  
  //}}AFX_VIRTUAL p^nL&yIW,%  
  // Implementation E9|eu\  
 protected: n,HE0Zn]Y_  
  HICON m_hIcon; OH^N" L  
  // Generated message map functions <e]Oa$  
  //{{AFX_MSG(CCaptureDlg) q+ KzIde|%  
  virtual BOOL OnInitDialog(); "LYh7:0s!k  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); R3)57OyV  
  afx_msg void OnPaint(); [XRCLi}  
  afx_msg HCURSOR OnQueryDragIcon(); l+V,DCE  
  virtual void OnCancel(); QVF]Ci_=  
  afx_msg void OnAbout(); )k&a}u5y  
  afx_msg void OnBrowse(); \~d";~Y`  
  afx_msg void OnChange(); V@7KsB  
 //}}AFX_MSG K3uG2g(>2  
 DECLARE_MESSAGE_MAP() oRKEJ Nps  
}; KIA 2"KbjG  
#endif J89Dul l  
@~<j&FTT  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file & gJV{V5Ay  
#include "stdafx.h" ""Zp:8o  
#include "Capture.h" ^J Z^>E~  
#include "CaptureDlg.h" =cN&A_L(  
#include <windowsx.h> >&g}7d%  
#pragma comment(lib,"hook.lib") '}g*!jL  
#ifdef _DEBUG +X`V|E,no  
#define new DEBUG_NEW I)q,kP@yY  
#undef THIS_FILE _LAS~x7,  
static char THIS_FILE[] = __FILE__; HkV1sT  
#endif IX: 25CEI2  
#define IDM_SHELL WM_USER+1 mNf8kwr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zWpqJK   
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); GU't%[  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; jztq.2-c#  
class CAboutDlg : public CDialog 9jN)I(^D6  
{ R(P%Csbqh  
 public:  $Y=T&O  
  CAboutDlg(); :+{ ?  
  // Dialog Data -U<Upn)2  
  //{{AFX_DATA(CAboutDlg) i |{Dd%4vK  
  enum { IDD = IDD_ABOUTBOX }; `r5 $LaD  
  //}}AFX_DATA T5Q{{@Q  
  // ClassWizard generated virtual function overrides 'Y$R~e^Y?  
  //{{AFX_VIRTUAL(CAboutDlg) `c/*H29  
 protected: Y+4o B  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8ul&x~2;X  
  //}}AFX_VIRTUAL 8<mjh0F-,  
  // Implementation sS&Z ,A  
 protected: KbL V' %D  
  //{{AFX_MSG(CAboutDlg) jENr>$$  
  //}}AFX_MSG O8|5KpXd@  
  DECLARE_MESSAGE_MAP() KZ!3j_pKy  
}; nd;fy$<J\  
d!KsNkk  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Xi?b]Z  
{ y%sroI('y  
 //{{AFX_DATA_INIT(CAboutDlg) {k4CEt;  
 //}}AFX_DATA_INIT UA[,2MBp  
} Cv$ SJc  
9Rm/V5  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f<+ 4rHT  
{ bX.ja;;   
 CDialog::DoDataExchange(pDX); $^&ig  
 //{{AFX_DATA_MAP(CAboutDlg) [Q\GxX.  
 //}}AFX_DATA_MAP ?u4INZ0W  
} < Dx]b*H  
@ S<-d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8 #ndFpu  
 //{{AFX_MSG_MAP(CAboutDlg) LPG`^SA  
 // No message handlers %{3 aW>yx  
 //}}AFX_MSG_MAP awv De  
END_MESSAGE_MAP() eI1GXQ%  
aNyvNEV3C  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ^xf<nNF:p  
: CDialog(CCaptureDlg::IDD, pParent) axHK_1N{  
{ L lBN-9p  
 //{{AFX_DATA_INIT(CCaptureDlg) liR ?  
  m_bControl = FALSE; T&86A\D\z  
  m_bAlt = FALSE; [4fU+D2\d  
  m_bShift = FALSE; iK?b~Q  
  m_Path = _T("c:\\"); i,13b e  
  m_Number = _T("0 picture captured."); [1Ydo`  
  nCount=0; A2}Rl%+X]6  
  bRegistered=FALSE; MNH1D! }  
  bTray=FALSE; Y(\T- bI  
 //}}AFX_DATA_INIT )BfT7{WN  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 fN"( mW>!  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /-6S{hl9Ne  
} qO`)F8  
DzQ1%!  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) Cf B.ZT  
{ 9h/>QLx  
 CDialog::DoDataExchange(pDX); P}.7Mehf  
 //{{AFX_DATA_MAP(CCaptureDlg) AxxJk"v'y  
  DDX_Control(pDX, IDC_KEY, m_Key); .^$YfTabq  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); mMMQ|ea  
  DDX_Check(pDX, IDC_ALT, m_bAlt); o ]IjK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); IVr 2y8K  
  DDX_Text(pDX, IDC_PATH, m_Path); >NB?& |  
  DDX_Text(pDX, IDC_NUMBER, m_Number); %4 \OPw&  
 //}}AFX_DATA_MAP 9WJz~SP+vR  
} E~<`/s  
++L?+^h  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) c!8=lrT.  
//{{AFX_MSG_MAP(CCaptureDlg) 3~e8bcb  
 ON_WM_SYSCOMMAND() .To;"D;j,  
 ON_WM_PAINT() H3{GmV8  
 ON_WM_QUERYDRAGICON() v^ d]r Sm  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) PSawMPw  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) DF6c|  
 ON_BN_CLICKED(ID_CHANGE, OnChange) qS&%!  
//}}AFX_MSG_MAP r_EcMIuk  
END_MESSAGE_MAP() fw oQ' &  
8A{_GH{:  
BOOL CCaptureDlg::OnInitDialog() qyHZ M}/  
{ nUq<TJ  
 CDialog::OnInitDialog(); 2 xw6 5z  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <8UYhGK  
 ASSERT(IDM_ABOUTBOX < 0xF000); iYnEwAoN;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); KJE[+R H+z  
 if (pSysMenu != NULL) bqanFQj  
 { O4<g%.HC6  
  CString strAboutMenu; Ev!{n  
  strAboutMenu.LoadString(IDS_ABOUTBOX); @|a>&~xX  
  if (!strAboutMenu.IsEmpty()) v#=`%]mL  
  { ]nhr+;of/-  
   pSysMenu->AppendMenu(MF_SEPARATOR); b;|55Y  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); KYJjwXT28W  
  } ~) ?  
 } fjnTe  
 SetIcon(m_hIcon, TRUE); // Set big icon  `[zQf  
 SetIcon(m_hIcon, FALSE); // Set small icon XPB9~::  
 m_Key.SetCurSel(0); :|o<SZ  
 RegisterHotkey(); ylKmj]A  
 CMenu* pMenu=GetSystemMenu(FALSE); 9+,R`v  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); t6c<kIQ:-O  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); v){ .Z^_C  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); jkiTj~WE-  
 return TRUE; // return TRUE unless you set the focus to a control I8OD$`~*U6  
} uS&| "*pR  
Ax oD8|  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) M5T9JWbN  
{ xoB},Xl$D  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) k%[3Q>5iM  
 { ;M]C1!D9#  
  CAboutDlg dlgAbout; RvJ['(-  
  dlgAbout.DoModal(); N8KQz_]9I  
 } crO@?m1  
 else CukC6u b  
 { _WX#a|4h{  
  CDialog::OnSysCommand(nID, lParam); 569}Xbc/  
 } $4jell  
} +7Kyyu)y@  
( *G\g=D  
void CCaptureDlg::OnPaint() M.h`&8  
{ 6)pH |d.FR  
 if (IsIconic()) w@2Vts  
 { reo{*) %  
  CPaintDC dc(this); // device context for painting (I@bkMp  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E^w:KC2@  
  // Center icon in client rectangle ZxGP/D  
  int cxIcon = GetSystemMetrics(SM_CXICON); = sAn,ri  
  int cyIcon = GetSystemMetrics(SM_CYICON); p8wyEHB  
  CRect rect; 2tayP@$  
  GetClientRect(&rect); X &2oPo  
  int x = (rect.Width() - cxIcon + 1) / 2; \U%#nU{  
  int y = (rect.Height() - cyIcon + 1) / 2; %iJ%{{f`  
  // Draw the icon (2?G:+C 7  
  dc.DrawIcon(x, y, m_hIcon); W:i?t8y\y  
 } [6jbgW~E  
 else ch5s<x#CE  
 { >]'yK!a?  
  CDialog::OnPaint(); 9*6]&:fm  
 } \qsw"B*tv`  
} dBO@6*N4c  
VC5_v62&.  
HCURSOR CCaptureDlg::OnQueryDragIcon() %tA57Pn>  
{ F>]#}_  
 return (HCURSOR) m_hIcon; eUS   
} doHF|<s  
5>9Y|UU  
void CCaptureDlg::OnCancel() JT[*3 h  
{ uhN%Aj\iu(  
 if(bTray) NGYyn`Lx  
  DeleteIcon(); h5 Vv:C  
  CDialog::OnCancel(); +b;hBb]R  
} W{XkV Ke1a  
+@X5!S6  
void CCaptureDlg::OnAbout() 5)1+~B  
{ ^EVc95|Z  
 CAboutDlg dlg; OEdJc\n_R  
 dlg.DoModal(); }~Q"s2  
} h72UwJ2rw  
4VN aq<8  
void CCaptureDlg::OnBrowse() l? #xAZx&_  
{ a )*6gf<5  
 CString str; 3*DXE9gA9  
 BROWSEINFO bi; ^GN8V-X4y  
 char name[MAX_PATH]; QbYc[8-[  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); F{k+7Ftc  
 bi.hwndOwner=GetSafeHwnd(); Dj-s5pAW  
 bi.pszDisplayName=name; [%HIbw J  
 bi.lpszTitle="Select folder"; ,]R8(bD)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 3E} An%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); jdeva t,&u  
 if(idl==NULL) ^=cXo<6D  
  return; mN0=i(H<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); tXF]t   
 str.ReleaseBuffer(); (yQ 5`  
 m_Path=str; {u7##Vrgt8  
 if(str.GetAt(str.GetLength()-1)!='\\') $ &5w\P  
  m_Path+="\\"; g1DmV,W-Q  
 UpdateData(FALSE); T+"f]v  
} 8F;>5i  
zIQzmvf  
void CCaptureDlg::SaveBmp() _BnTv$.P  
{ E]^5I3=O  
 CDC dc; /I&wj^   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); _17|U K|N  
 CBitmap bm; uK*Nu^  
 int Width=GetSystemMetrics(SM_CXSCREEN); BpAB5=M0  
 int Height=GetSystemMetrics(SM_CYSCREEN); B7Ntk MK  
 bm.CreateCompatibleBitmap(&dc,Width,Height); lp&!lb`  
 CDC tdc; jyW[m,#(go  
 tdc.CreateCompatibleDC(&dc); 1S%k  
 CBitmap*pOld=tdc.SelectObject(&bm); "u}9@}*  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); -237Lx$/  
 tdc.SelectObject(pOld); $%2_{m_K:p  
 BITMAP btm; h~HB0^|  
 bm.GetBitmap(&btm);  ~QG ?k  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; f F?6j   
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ~pP0|B*%  
 BITMAPINFOHEADER bih; w=r&?{  
 bih.biBitCount=btm.bmBitsPixel; 2x$x; \*j  
 bih.biClrImportant=0; L3y5a?G  
 bih.biClrUsed=0; ^<V9'Ut   
 bih.biCompression=0; _|c&@M  
 bih.biHeight=btm.bmHeight; #S QXTR  
 bih.biPlanes=1; 5#:pT  
 bih.biSize=sizeof(BITMAPINFOHEADER); "#^MUQ!a  
 bih.biSizeImage=size; Dxx;v.$  
 bih.biWidth=btm.bmWidth; 5?u[XAE  
 bih.biXPelsPerMeter=0; p(3sgY1  
 bih.biYPelsPerMeter=0; _[Gb)/@mM  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ' |K.k6  
 static int filecount=0; ka7uK][  
 CString name; e]W0xC-  
 name.Format("pict%04d.bmp",filecount++); ?z`MPdO  
 name=m_Path+name; 2@@l{Y0f6  
 BITMAPFILEHEADER bfh; jThbeY[  
 bfh.bfReserved1=bfh.bfReserved2=0; .e[Tu|qo  
 bfh.bfType=((WORD)('M'<< 8)|'B');  o sdOw8  
 bfh.bfSize=54+size; 4~?2wvz G4  
 bfh.bfOffBits=54; )@QJ  
 CFile bf; "mj^+u-  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ m$UvFP1>u1  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); I/u9RmbU  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); OS7R Qw1  
  bf.WriteHuge(lpData,size); [$:,-Q@  
  bf.Close(); SPy3~Db-o  
  nCount++; VAj<E0>  
 } 3l:QeZ  
 GlobalFreePtr(lpData); tbj=~xYf  
 if(nCount==1) 4_Rdp`x#J  
  m_Number.Format("%d picture captured.",nCount); VZxTx0: ,  
 else ~^o=a?L`<  
  m_Number.Format("%d pictures captured.",nCount); v+q<BYq  
  UpdateData(FALSE); hYt7kq!"  
} >S&U.  
wz#[:2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) TL-i=\{L:d  
{ }0eg{{g8  
 if(pMsg -> message == WM_KEYDOWN) oj.lj!  
 { )5l u.R%  
  if(pMsg -> wParam == VK_ESCAPE) ~@M7&%]  
   return TRUE; }5S2p@W)  
  if(pMsg -> wParam == VK_RETURN)  Dt}dp_  
   return TRUE; F?*k}]Gi  
 } G\rj?%  
 return CDialog::PreTranslateMessage(pMsg); rZC3\,W  
} ;w6s<a@Zh  
d.}}s$Q  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) mxtgb$*  
{ XL"=vbD  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ v&0d$@6/U  
  SaveBmp(); >q|Q-I~gs  
  return FALSE; PZ]5Hf1"  
} Kdt|i93  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ o<\6Rm  
 CMenu pop; fGO*% )  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); g5}7y\  
 CMenu*pMenu=pop.GetSubMenu(0); FN{/.?w(  
 pMenu->SetDefaultItem(ID_EXITICON); >ZCo 8aK  
 CPoint pt; 9+VF<;Xw  
 GetCursorPos(&pt); JLW$+62  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); K`+vfqX  
 if(id==ID_EXITICON) EVz9WY  
  DeleteIcon(); p$OD*f_b  
 else if(id==ID_EXIT) ]Y5dl;xrM)  
  OnCancel(); ;/A}}B]y  
 return FALSE; u8uW9 <  
} ZrcPgcF  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ' o=E!?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ~I)uWo  
 AddIcon(); F ?mA1T>x  
 return res; 9/46%=&]  
} d=n h  
`QLowna  
void CCaptureDlg::AddIcon() '5WN,Vy8.  
{ i+U51t<  
 NOTIFYICONDATA data; M7 p8^NL  
 data.cbSize=sizeof(NOTIFYICONDATA); jeFN*r _  
 CString tip; 'Kd7l}e!  
 tip.LoadString(IDS_ICONTIP); `i4I!E  
 data.hIcon=GetIcon(0); !u0U5>ccw  
 data.hWnd=GetSafeHwnd(); .CmL7 5  
 strcpy(data.szTip,tip); ?'LM7RE$X6  
 data.uCallbackMessage=IDM_SHELL; r%[1$mTOR  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 7-g^2sa'(  
 data.uID=98; "gg(tp45  
 Shell_NotifyIcon(NIM_ADD,&data); <j"O%y.  
 ShowWindow(SW_HIDE); A:xb!= 2  
 bTray=TRUE; c,AZ/t  
} /'`6 ; uRN  
7jR7  
void CCaptureDlg::DeleteIcon() rG5i-'  
{ Ys+N,:#R  
 NOTIFYICONDATA data; ;qG1r@o  
 data.cbSize=sizeof(NOTIFYICONDATA); JJNmpUJ  
 data.hWnd=GetSafeHwnd(); 5=.7\#D  
 data.uID=98; yTj p-  
 Shell_NotifyIcon(NIM_DELETE,&data); uXP- J]>  
 ShowWindow(SW_SHOW); WhenwQT  
 SetForegroundWindow(); scmto cm  
 ShowWindow(SW_SHOWNORMAL); 3DI^y` av  
 bTray=FALSE; 0$?qoS  
} /MqP[*L  
w*2^/zh  
void CCaptureDlg::OnChange() +DxifXtB  
{ *vXDuhQ  
 RegisterHotkey(); }{#7Z8   
} <tU :U<ea]  
* S{\#s  
BOOL CCaptureDlg::RegisterHotkey() {Ot[WF  
{ KMe.i'  
 UpdateData(); , Z4p0M  
 UCHAR mask=0; !r2}59 J  
 UCHAR key=0; =_pmy>_z  
 if(m_bControl) Lqq*Nr  
  mask|=4; B,:23[v  
 if(m_bAlt) -MUQ \pZ  
  mask|=2; Ol_/uy1r[  
 if(m_bShift) l]/> `62  
  mask|=1; 7j95"mI  
  key=Key_Table[m_Key.GetCurSel()]; : (RL8  
 if(bRegistered){ ;]"n?uo  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ;\q<zO@x  
  bRegistered=FALSE; ew/KZE  
 } @u<0_r t  
 cMask=mask; l#|J rU!  
 cKey=key; 'bG1U`v=3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (T4k~T`3  
 return bRegistered; UT % #K%  
} I}1fEw>8  
?Ip$;s  
  四、小结 0rGj|@+;  
yCZ2^P!a  
  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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