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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: wyH[x!QX  
  gMi0FO'  
  一、实现方法 `f,/`''R  
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  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: P1. [  
@o].He@L<j  
#pragma data_seg("shareddata") B-RjMxX4>  
HHOOK hHook =NULL; //钩子句柄 ].avItg  
UINT nHookCount =0; //挂接的程序数目 r8t}TU>C  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 j7Yu>cr  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @Myo'{3vF  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey YH}'s>xZz  
static int KeyCount =0; nUaJzPl  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^)/0yB  
#pragma data_seg() gi3F` m  
/cUO$m o  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 @W.S6;GA\  
<q58uuK  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ^`i#$  
^x]r`b  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR (q/e1L-S  
cKey,UCHAR cMask) do hA0  
{ !NK1MU?T)  
 BOOL bAdded=FALSE; ~Py`P'+  
 for(int index=0;index<MAX_KEY;index++){ ;DQ ZT  
  if(hCallWnd[index]==0){  \{_q.;}  
   hCallWnd[index]=hWnd; ~f2z]JLr:  
   HotKey[index]=cKey; "m):Y;9iQ?  
   HotKeyMask[index]=cMask; +uF>2b6'  
   bAdded=TRUE; /aCc17>2V{  
   KeyCount++; DaQ?\uq  
   break; 3GYw+%Z]  
  } o+iiST JEe  
 } kM l+yli3c  
 return bAdded; >a<.mU|#  
} G`D`Af/B  
//删除热键 fivw~z|[@  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) d UE,U=  
{ 3Y4?CM&0v  
 BOOL bRemoved=FALSE; PA{PD.4Du  
 for(int index=0;index<MAX_KEY;index++){ 0@0w+&*"@  
  if(hCallWnd[index]==hWnd){ h%na>G  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ biD$qg  
    hCallWnd[index]=NULL; )2KF}{  
    HotKey[index]=0; ,$L4dF3  
    HotKeyMask[index]=0; aH(J,XY  
    bRemoved=TRUE; _#E0g'3  
    KeyCount--; 3PWL@>zi  
    break; "m$##X\  
   } m#Jmdb_  
  } q s!j>x  
 } nIf1sH>  
 return bRemoved; .[KrlfI  
} PcMD])Z{G  
GT.,  
MTh<|$   
  DLL中的钩子函数如下: ~8Fk(E_  
z=\&i\>;Z+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \A#41  
{ Lnl(2xD  
 BOOL bProcessed=FALSE; CJx|?yK2  
 if(HC_ACTION==nCode) OX0%C.K)hZ  
 { )T2Caqs2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 z6\UGSL  
   switch(wParam) ;%9|k U  
   {  9!\B6=r y4  
    case VK_MENU: !X#OOqPr=  
     MaskBits&=~ALTBIT; !;v|'I  
     break; m4Qh%}9%  
    case VK_CONTROL: <8&au(I,vB  
     MaskBits&=~CTRLBIT; a(X@Q8l:  
     break; `UyG_;  
    case VK_SHIFT: '3tCH)s  
     MaskBits&=~SHIFTBIT; FIhk@TKa  
     break; /& {A!.;  
    default: //judge the key and send message 1<@W6@]  
     break; *I.f1lz%*  
   } ORw,)l  
   for(int index=0;index<MAX_KEY;index++){ S!CC }3zw  
    if(hCallWnd[index]==NULL) WIxy}3_to  
     continue; cd_yzpL@}J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :J@ gmY:C  
    { V!A~K   
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `5.'_3  
     bProcessed=TRUE; Qx#"q'2  
    } ql{ OETn#  
   } ` p-cSxR_  
  } %)W2H^  
  else if((lParam&0xc000ffff)==1){ //有键按下 B%b4v  
   switch(wParam) -<!NXm|kvz  
   { &%DY\*  
    case VK_MENU: CYP q#rd  
     MaskBits|=ALTBIT; 5c0 ZRV#  
     break; cp7=epho  
    case VK_CONTROL: }2.`N%[  
     MaskBits|=CTRLBIT; ,!y$qVg'\f  
     break; #OD/$f_  
    case VK_SHIFT: (Zrj_P`0[  
     MaskBits|=SHIFTBIT; `?_Q5lp/s  
     break; <0&*9ZeD  
    default: //judge the key and send message vJ[^  K  
     break; .j0$J\:i  
   } [EXs  
   for(int index=0;index<MAX_KEY;index++){ }rw8PZ9  
    if(hCallWnd[index]==NULL) m8hk:4Ae  
     continue; _op}1   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m@v\(rT.  
    { /]Md~=yNp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); | rtD.,m   
     bProcessed=TRUE; ~Otoqu|  
    } 7WS p($  
   } L+i=VGm0  
  } 9 -a0:bP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 C1n>M}b  
   for(int index=0;index<MAX_KEY;index++){ @,my7?::oM  
    if(hCallWnd[index]==NULL) ^%{7}g&$u  
     continue; D.u{~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) eJX9_6m-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 0 ZKx<]!  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 LCKV>3+_#  
   } y/7\?qfTk  
  } %XQ(fj>  
 } 'S&zCTX7j  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 16(QR-  
} []1C$.5DD  
`l[c_%Bm  
  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: D'Df JwA  
v$wIm,j  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ;'@9[N9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 0=1T.4+=  
U$A]8NZ$S  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^k">A:E2  
:OT0yA=U  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) d^ 8ZeC#  
{ u `6:5k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) !z3jTv  
 { Cnh \%OW  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 X5$Iyis  
  SaveBmp(); xY(*.T9K  
  return FALSE; dkTX  
 } &n:.k}/P  
 …… //其它处理及默认处理 Aw.qK9I  
} &B1WtW  
bK&+5t&  
GGs}i1m  
  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。 f r6 fj  
{hrX'2:ClT  
  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。 33B]RGq  
{cVEmvE8  
  二、编程步骤 c`w}|d]mC  
~=l;=7 T  
  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"; )Y{L&A  
+',S]Edx  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; y766; X:J  
=GMkR+<)  
  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; .}~_a76  
v`Oc,  
  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; c,+:i1IAy  
'I6i ,+D/q  
  5、 添加代码,编译运行程序。 M%P:n/j  
)1`0PJoHE  
三、程序代码 aj{Y\ 3L  
m~0/&RA  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL $B5aje}i  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) r52gn(,  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 6mxfLlZ  
#if _MSC_VER > 1000 00~mOK;1  
#pragma once ~V1E0qdAE  
#endif // _MSC_VER > 1000 }N6.Uu 5zI  
#ifndef __AFXWIN_H__ ` 7V]y -  
#error include 'stdafx.h' before including this file for PCH 56kI 5:  
#endif kJT)r6  
#include "resource.h" // main symbols ;"-&1qHN  
class CHookApp : public CWinApp ,(^*+G.i  
{ ope^~+c~\  
 public: ~dTrf>R8M  
  CHookApp(); z_4J)?3  
  // Overrides v;D~Pa  
  // ClassWizard generated virtual function overrides Y O}<Ytx  
  //{{AFX_VIRTUAL(CHookApp) M&9+6e'-F  
 public: 60?%<oJ oH  
  virtual BOOL InitInstance(); tW}'g:s  
  virtual int ExitInstance(); \xw5JGm  
  //}}AFX_VIRTUAL +Q"4Migbe@  
  //{{AFX_MSG(CHookApp) FP4P|kl/9'  
  // NOTE - the ClassWizard will add and remove member functions here. 5D//*}b,  
  // DO NOT EDIT what you see in these blocks of generated code ! 7Kxp=-k  
  //}}AFX_MSG lZKi'vg7  
  DECLARE_MESSAGE_MAP() Q K<"2p?  
}; a~y'RyA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "b3"TPfK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }y gD3:vN7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); \d`h/tHk  
BOOL InitHotkey(); |[b{)s?x  
BOOL UnInit(); t!7-DF|N  
#endif ZyFjFHe+  
?)d~cJ  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ^v7gIC  
#include "stdafx.h" 5">Z'+8  
#include "hook.h" D_zZXbNc  
#include <windowsx.h> suDQ~\ n  
#ifdef _DEBUG R.yvjPwJ  
#define new DEBUG_NEW V+9 MoT?8  
#undef THIS_FILE CB}2j  
static char THIS_FILE[] = __FILE__; SSMHoJGm  
#endif J)p l|I  
#define MAX_KEY 100 @_}P-h  
#define CTRLBIT 0x04 r$s Qf&=  
#define ALTBIT 0x02 ;vjOUn[E  
#define SHIFTBIT 0x01 V1B5w_^>h'  
#pragma data_seg("shareddata") p9{mS7R9T  
HHOOK hHook =NULL; >(t6.=  
UINT nHookCount =0; 89(Q1R ?:  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey &\*(Q*2N  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT d5:c^`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey j*r{2f4Rt  
static int KeyCount =0; m^;f(IK5  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift nUOz\ y  
#pragma data_seg() xdkZdx>N  
HINSTANCE hins; T{[=oH+  
void VerifyWindow(); WCixKYq  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) g{&ui.ml&  
//{{AFX_MSG_MAP(CHookApp) Yr[\|$H5  
// NOTE - the ClassWizard will add and remove mapping macros here. ; kI134i=  
// DO NOT EDIT what you see in these blocks of generated code! ge8ZsaiU  
//}}AFX_MSG_MAP amY!qg0P*  
END_MESSAGE_MAP() {&1/V  
6i3$CW  
CHookApp::CHookApp() [Y| t]^M  
{ Z4 =GMXj  
 // TODO: add construction code here, JY(WK@  
 // Place all significant initialization in InitInstance 1#+S+g@#  
} p H2Sbs:Tk  
v):Or'$~M  
CHookApp theApp; ;>7De8v@@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Q*~]h;6\{d  
{ z!9-:  
 BOOL bProcessed=FALSE; >e$PP8&i_T  
 if(HC_ACTION==nCode) TAW/zpps$  
 { t;\Y{`  
  if((lParam&0xc0000000)==0xc0000000){// Key up 7WZ+T"O{I  
   switch(wParam) ePo}y])2  
   { { 9q4)R}G  
    case VK_MENU: k~nBiV  
     MaskBits&=~ALTBIT; Oxd]y1  
     break; ]~3V}z,T*  
    case VK_CONTROL: -6B4sZpzD  
     MaskBits&=~CTRLBIT; 9p(. A$  
     break; %._.~V  
    case VK_SHIFT: H"WprHe  
     MaskBits&=~SHIFTBIT; c9h6C  
     break; XlR@pr6tw  
    default: //judge the key and send message o!A+&{  
     break; E hMNap}5"  
   } z-)O9PV  
   for(int index=0;index<MAX_KEY;index++){ Lw>N rY(Y  
    if(hCallWnd[index]==NULL) BnasI;yWb  
     continue; wz%Nb Ly-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *gWwALGo5  
    { $-sHWYZ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Uz]|N6`  
     bProcessed=TRUE; YNi.SXH  
    } #QMz<P/Gl6  
   } )\$|X}uny&  
  } 97!;.f-  
  else if((lParam&0xc000ffff)==1){ //Key down +52{-a,>  
   switch(wParam) -nV9:opD  
   { {_v#~595  
    case VK_MENU: pFjK}J OF  
     MaskBits|=ALTBIT; *J`O"a  
     break; ZPYS$Ydy  
    case VK_CONTROL: 9x =Y^',5  
     MaskBits|=CTRLBIT; 6T`i/".  
     break; Qzw;i8n{  
    case VK_SHIFT: /mzlH  
     MaskBits|=SHIFTBIT; i=2N;sAl  
     break; P5 ywhw-  
    default: //judge the key and send message "=MeM)K  
     break; e$rZ5X  
   } b d!Y\OD  
   for(int index=0;index<MAX_KEY;index++) t"oeQ*d%  
   { Pe3o;mx  
    if(hCallWnd[index]==NULL) X=&KayD  
     continue; 5:_}zu|!u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) *\F~[  
    { ^^ixa1H<  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T]~ xj4  
     bProcessed=TRUE; X#^[<5  
    } ]:J$w]\  
   } 7 HYwLG:\~  
  } :Zw2'IV  
  if(!bProcessed){ Pa: |_IXA  
   for(int index=0;index<MAX_KEY;index++){ b@hqz!)l`  
    if(hCallWnd[index]==NULL) .HABNPNg(  
     continue; 7s^'d,P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) X 0+vXz{~g  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {]4LULq  
   } sK?twg;D*|  
  } HJ.-Dg5U  
 } KHvYUTY  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,Ma^&ypH  
} j^RmrOg ,  
NC6&x=!3  
BOOL InitHotkey() g *+>H1}  
{ e~"U @8xk~  
 if(hHook!=NULL){ ;#< 0<  
  nHookCount++; 19%i mf  
  return TRUE; \1M4Dl5!  
 } 0?|<I{z2  
 else NL+N%2XG7  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); wi{3/  
  if(hHook!=NULL) O+x!Bg7   
   nHookCount++; +X 88;-  
  return (hHook!=NULL); yyTnL 2Y9  
} /PXzwP_(A  
BOOL UnInit() G7/ +ogV  
{ 1<aP92/N&  
 if(nHookCount>1){ g2Z`zQA7  
  nHookCount--; }3WxZv]I}  
  return TRUE; aV0"~5  
 } cQ}{[YO  
 BOOL unhooked = UnhookWindowsHookEx(hHook); +^F Zq$NP  
 if(unhooked==TRUE){ "qy,*{~  
  nHookCount=0; +k R4E23:  
  hHook=NULL; qwAT>4  
 } &m;*<}X  
 return unhooked; Bdpy:'fJn  
} l,aay-E  
V0a3<6@4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w7&A0M  
{ k$:|-_(w  
 BOOL bAdded=FALSE; ~6md !o%i  
 for(int index=0;index<MAX_KEY;index++){ )NT*bLRPQ  
  if(hCallWnd[index]==0){ (A.C]hD  
   hCallWnd[index]=hWnd; {R{=+2K!|k  
   HotKey[index]=cKey; _Y m2/3!  
   HotKeyMask[index]=cMask; v4 E}D  
   bAdded=TRUE; 6Q5^>\Y  
   KeyCount++; X1_5KH  
   break; Bk{]g=DO  
  } vtJJ#8a]  
 } DzRFMYBR  
 return bAdded; pT6$DB#  
} +Vdpy (  
NDokSw-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 9%obq/Lb  
{ YtLt*Ig%  
 BOOL bRemoved=FALSE; vW@=<aS Z  
 for(int index=0;index<MAX_KEY;index++){ Y8t8!{ytg  
  if(hCallWnd[index]==hWnd){ t"I77aZ$A  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1X1dG#:  
    hCallWnd[index]=NULL; wVtwx0|1  
    HotKey[index]=0; n~Lt\K:  
    HotKeyMask[index]=0; ]T) 'Hb  
    bRemoved=TRUE; _DEjF)S  
    KeyCount--; z`b,h\  
    break; 7F.4Ga;  
   } % A0/1{(  
  } ql~J8G9  
 } u_Z+;{]Pj  
 return bRemoved; e&>2 n  
} F_P~x(X  
3o/[t  
void VerifyWindow() :[d9tm  
{ b| (: [nB  
 for(int i=0;i<MAX_KEY;i++){ |JsZJ9W+J  
  if(hCallWnd!=NULL){ llDkJ)\  
   if(!IsWindow(hCallWnd)){ :b!s2n!u  
    hCallWnd=NULL; G^@5H/)  
    HotKey=0; RPbZ(.  
    HotKeyMask=0; bvOq5Q6  
    KeyCount--; #B w0,\  
   } tX~w{|k  
  } EKN~H$.  
 } 1=v*O.XW`  
} %@Jsal'  
PQE =D0  
BOOL CHookApp::InitInstance() QTnP'5y  
{ #lO Mm9  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); iN.n8MN=I  
 hins=AfxGetInstanceHandle(); 3$ PV2"  
 InitHotkey(); eszG0Wu  
 return CWinApp::InitInstance(); IAyp2  
} 1B\WA8  
.jK4?}]  
int CHookApp::ExitInstance() tT._VK]o&R  
{ Ew$C ;&9  
 VerifyWindow(); NX&_p!_V  
 UnInit(); dQG=G%W  
 return CWinApp::ExitInstance(); \ 6MCxh6  
} bhs _9ivw  
gI`m.EH}}N  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >.D4co>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) u]G\H!Wk Q  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3iU=c&P  
#if _MSC_VER > 1000 Qv ?"b  
#pragma once #s9aI_  
#endif // _MSC_VER > 1000 <{cQ2  
O&hTNIfi  
class CCaptureDlg : public CDialog e~(5%CO>#j  
{ -7|H}!DFT  
 // Construction $Z>'Jp  
 public: 7PF%76TO  
  BOOL bTray; 51.%;aY~z  
  BOOL bRegistered; DIUjn;>k8  
  BOOL RegisterHotkey(); TJ*T:?>e  
  UCHAR cKey; \^1E4C\":  
  UCHAR cMask; . 'yCw#f  
  void DeleteIcon(); $`'/+x"%  
  void AddIcon(); M'l ;:  
  UINT nCount; OB}Ib]  
  void SaveBmp(); yF/jFn  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor aQI(Y^&%3  
  // Dialog Data &>}5jC.I  
  //{{AFX_DATA(CCaptureDlg) wS3'?PRX  
  enum { IDD = IDD_CAPTURE_DIALOG }; a09<!0Rp  
  CComboBox m_Key; 9Gz=lc[!7  
  BOOL m_bControl; >5SSQ\2~a  
  BOOL m_bAlt; lUMdrt0@z  
  BOOL m_bShift; q75s#[<ap  
  CString m_Path; Yoll?_k+  
  CString m_Number; x$(f7?s] 1  
  //}}AFX_DATA 8a"%0d#  
  // ClassWizard generated virtual function overrides xe$_aBU  
  //{{AFX_VIRTUAL(CCaptureDlg) ,"0 :3+(8;  
 public: Q=dy<kg']  
  virtual BOOL PreTranslateMessage(MSG* pMsg); >`D:-huNeE  
 protected: 7IM@i>p%  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ??/ 'kmd  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); L{Vqh0QD&  
  //}}AFX_VIRTUAL QSf|nNT  
  // Implementation 0Y5_PTWb+Y  
 protected: '}#9)}x!  
  HICON m_hIcon; Ef{Vp;]  
  // Generated message map functions UR5`ue ;  
  //{{AFX_MSG(CCaptureDlg) ;xn0;V'=  
  virtual BOOL OnInitDialog(); J4U1t2@)9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 2I{"XB  
  afx_msg void OnPaint(); Oa>Ppldeg  
  afx_msg HCURSOR OnQueryDragIcon(); mB)bcuPv  
  virtual void OnCancel(); o[D9I hs  
  afx_msg void OnAbout(); Srd4))2/0  
  afx_msg void OnBrowse(); is@?VklnB  
  afx_msg void OnChange(); 5Jnlz@P9  
 //}}AFX_MSG E&:,oG2M  
 DECLARE_MESSAGE_MAP() J<lO= +mg  
}; {BU;$  
#endif w@fi{H(R  
(&x['IR  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .6 ?U@2  
#include "stdafx.h" LjHVJSC  
#include "Capture.h" vY`s'%WV  
#include "CaptureDlg.h" Ny)X+2Ae  
#include <windowsx.h> C+&l< fM&  
#pragma comment(lib,"hook.lib") Eu04e N  
#ifdef _DEBUG seeB S/%  
#define new DEBUG_NEW El"Q'(:/U  
#undef THIS_FILE LBP`hK:>W~  
static char THIS_FILE[] = __FILE__; ?=pT7M  
#endif Yc*; /T}  
#define IDM_SHELL WM_USER+1 K\c#ig   
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); BTrn0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;i+#fQO7Q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8DaL,bi*.  
class CAboutDlg : public CDialog ^sWT:BDh  
{ o2\8OxcA  
 public: R@rBEW&  
  CAboutDlg(); d m%8K6|  
  // Dialog Data X)3!_  
  //{{AFX_DATA(CAboutDlg) R ViuJ;  
  enum { IDD = IDD_ABOUTBOX }; }*"p?L^p{  
  //}}AFX_DATA "g8M0[7e3  
  // ClassWizard generated virtual function overrides X!g#T9kG  
  //{{AFX_VIRTUAL(CAboutDlg) Uf+%W;}  
 protected: Q&bM\;Ml  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]e@Oiq  
  //}}AFX_VIRTUAL Pk)1WK7E  
  // Implementation -A!%*9Z  
 protected: 7Hu3>4<  
  //{{AFX_MSG(CAboutDlg) P7/X|M z  
  //}}AFX_MSG FaJ&GOM,  
  DECLARE_MESSAGE_MAP() W `}Rf\g  
}; E-g_".agO  
`*KHS A  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) jRV/A!4  
{ v|2T%y_ u  
 //{{AFX_DATA_INIT(CAboutDlg) N ZSSg2TX#  
 //}}AFX_DATA_INIT 0:d_Yv,D  
} .kfI i^z  
&@YmA1Yu)E  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 3? +Hd  
{ {Y9q[D'g.  
 CDialog::DoDataExchange(pDX); '2^Q1{ :\  
 //{{AFX_DATA_MAP(CAboutDlg) 6)Lk-D  
 //}}AFX_DATA_MAP tIgN$BHR>  
} i~J'%a<Qp  
wj0\$NQ=x  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6!FQzFCZq  
 //{{AFX_MSG_MAP(CAboutDlg) VP]%Hni]  
 // No message handlers B^9j@3Ux  
 //}}AFX_MSG_MAP czd~8WgOa  
END_MESSAGE_MAP() u;c?d!E  
h'F=YF$o  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) {/:x5l8  
: CDialog(CCaptureDlg::IDD, pParent) Z?QC!bWb  
{ +K4}Dmg  
 //{{AFX_DATA_INIT(CCaptureDlg) #;nYg?d=  
  m_bControl = FALSE; '`KY! ]L  
  m_bAlt = FALSE; XpJ7o=?W3  
  m_bShift = FALSE; n ?Nt6U  
  m_Path = _T("c:\\"); }`~+]9 <   
  m_Number = _T("0 picture captured."); sON|w86B  
  nCount=0; b SU~XGPB  
  bRegistered=FALSE; =C.$ UX  
  bTray=FALSE; 7Jho}5J  
 //}}AFX_DATA_INIT ~Jz6O U*z  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ixD)VcD-f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); CzEd8jeh7  
} sLAQE64\"  
oILZgNe'  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +; AZ+w]ZF  
{ Y0 -n\|  
 CDialog::DoDataExchange(pDX); @I!0-OjL  
 //{{AFX_DATA_MAP(CCaptureDlg) LSr]S79N1  
  DDX_Control(pDX, IDC_KEY, m_Key); ~R92cH>L  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 0:Ol7  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 3'u-'  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [u*5z.^  
  DDX_Text(pDX, IDC_PATH, m_Path); .0]<k,JZZ  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "a U aotx  
 //}}AFX_DATA_MAP Y/zj[>  
}  a!AA]  
;;N9>M?b  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) OpYY{f  
//{{AFX_MSG_MAP(CCaptureDlg) AkQ ~k0i}b  
 ON_WM_SYSCOMMAND() !d0kV,F:  
 ON_WM_PAINT() 7O-x<P;  
 ON_WM_QUERYDRAGICON() H~1 jY4E  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) w&T9;_/  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) SNI)9k(T{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Hja3a{LH  
//}}AFX_MSG_MAP nc|p)  
END_MESSAGE_MAP() G*P#]eO  
^3L0w}#  
BOOL CCaptureDlg::OnInitDialog() cH t#us  
{ |_@>*Vmg  
 CDialog::OnInitDialog(); IB] l1<  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); j+  0I-p  
 ASSERT(IDM_ABOUTBOX < 0xF000); VS8Rx.?  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]-/VHh  
 if (pSysMenu != NULL) Y glmX"fLf  
 { : E )>\&  
  CString strAboutMenu; Qjv}$`M  
  strAboutMenu.LoadString(IDS_ABOUTBOX); bAtSVu  
  if (!strAboutMenu.IsEmpty()) 7! INkH]  
  { 5taT5?n2  
   pSysMenu->AppendMenu(MF_SEPARATOR); {[?(9u7R  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 1NA.nw.  
  } ^sLdAC  
 } Cd}<a?m,  
 SetIcon(m_hIcon, TRUE); // Set big icon 68WO~*  
 SetIcon(m_hIcon, FALSE); // Set small icon \n|EM@=eE  
 m_Key.SetCurSel(0); nk' s_a*Z  
 RegisterHotkey(); sN01rtB(UT  
 CMenu* pMenu=GetSystemMenu(FALSE); 6zuTQ^pz  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fHd#u%63K  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 8>i n_h9  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); JO6)-U$7UG  
 return TRUE; // return TRUE unless you set the focus to a control g&Vx:fOC  
} pJ'"j 6Q  
U>}w2bZ*  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,M ^<CJ  
{ @O^6&\s>  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) :(*V?WI  
 { K:# I  
  CAboutDlg dlgAbout; *d4 eK+U$5  
  dlgAbout.DoModal(); \\B(r  
 } dk4CpN  
 else x\G'kEd  
 { o9yJf#-En  
  CDialog::OnSysCommand(nID, lParam); dn$!&  
 } w-L=LWL\  
} PmEsN&YP]  
3kp+<$  
void CCaptureDlg::OnPaint() 6) [H?Q  
{ XrGglBIV  
 if (IsIconic()) V#gK$uv  
 { gu.}M:u  
  CPaintDC dc(this); // device context for painting eiaFaYe\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); XW)lDiJl  
  // Center icon in client rectangle o~y;j75{.*  
  int cxIcon = GetSystemMetrics(SM_CXICON); c2 C8g1n  
  int cyIcon = GetSystemMetrics(SM_CYICON); 2B&3TLO  
  CRect rect; 4*cEag   
  GetClientRect(&rect); w;:*P  
  int x = (rect.Width() - cxIcon + 1) / 2; ,G?WAOy,  
  int y = (rect.Height() - cyIcon + 1) / 2; lE(HFal0-(  
  // Draw the icon /dI&o,sA  
  dc.DrawIcon(x, y, m_hIcon); (m(JK^  
 } T;a}#56{^  
 else ~H<6gN<j(.  
 { +.b,AqJ/  
  CDialog::OnPaint(); .2Elr(&*h  
 } yEoF4bt  
} Ww+IWW@  
Ad9}9!<  
HCURSOR CCaptureDlg::OnQueryDragIcon() x,pjpx  
{ l'E*=Rn  
 return (HCURSOR) m_hIcon; paE[rS\  
} 3J|F?M"N7  
}?_?V&K|  
void CCaptureDlg::OnCancel() 4-y :/8  
{ By",rD- r  
 if(bTray) :v&$o'Sak  
  DeleteIcon(); |a`Sc %  
  CDialog::OnCancel(); u$Jz~:=,  
} sW'AjI  
dhf!o0'1M  
void CCaptureDlg::OnAbout() u5b|#&-mX  
{ BLf>_b Uk  
 CAboutDlg dlg; DGn;m\B  
 dlg.DoModal(); i0kak`x0  
} 1POmP&fI(  
}"P|`"WW  
void CCaptureDlg::OnBrowse() b)5uf'?-  
{ Ru!iR#s)!  
 CString str; *:LK8U  
 BROWSEINFO bi; x$.^"l-vX  
 char name[MAX_PATH]; L;NvcUFn  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yT"Eq"7/Y#  
 bi.hwndOwner=GetSafeHwnd(); '/n1IM$7  
 bi.pszDisplayName=name; ;yLu R  
 bi.lpszTitle="Select folder"; l<LP&  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; { VfXsI  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); r|fL&dtr  
 if(idl==NULL) Ls$D$/:q?  
  return; _~J {wM  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "R1NG?; q  
 str.ReleaseBuffer(); /h H  
 m_Path=str; CR`Q#Yi  
 if(str.GetAt(str.GetLength()-1)!='\\') RYQR(v  
  m_Path+="\\"; t?-n*9,#S  
 UpdateData(FALSE); BB!THj69a6  
} j<99FW"@e  
fo#fg8zX%  
void CCaptureDlg::SaveBmp() BxWPC#5  
{ WwBOM~/`2  
 CDC dc; Vl /+;6_  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Vvn2 Ep  
 CBitmap bm; HV!m8k=6  
 int Width=GetSystemMetrics(SM_CXSCREEN); H z1%x  
 int Height=GetSystemMetrics(SM_CYSCREEN); FxtQXu-g  
 bm.CreateCompatibleBitmap(&dc,Width,Height); :bu/^mW[  
 CDC tdc; \378rQU  
 tdc.CreateCompatibleDC(&dc); . y-D16V  
 CBitmap*pOld=tdc.SelectObject(&bm); %S@ZXf~:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ^& tZ  
 tdc.SelectObject(pOld); 9N%We|L,c  
 BITMAP btm; n.`($yR_  
 bm.GetBitmap(&btm); h-#6av :  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; nwB_8mN|  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); QT< }] 0  
 BITMAPINFOHEADER bih; 1R{!]uh  
 bih.biBitCount=btm.bmBitsPixel; Q_Q''j(r6b  
 bih.biClrImportant=0; iwZPpl ";  
 bih.biClrUsed=0; F3v !AvA|  
 bih.biCompression=0; x=hiQ>BIO0  
 bih.biHeight=btm.bmHeight; pMx*F@&nU  
 bih.biPlanes=1; I {S;L  
 bih.biSize=sizeof(BITMAPINFOHEADER); 0[NZ>7wqMZ  
 bih.biSizeImage=size; M=.n7RY-  
 bih.biWidth=btm.bmWidth; <CYd+! (  
 bih.biXPelsPerMeter=0; j^j1  
 bih.biYPelsPerMeter=0; \:# L)   
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); av}k)ZT_  
 static int filecount=0; H1pO!>M  
 CString name; =)H.c uc  
 name.Format("pict%04d.bmp",filecount++); w(*vj  
 name=m_Path+name; +qtJaYf/0  
 BITMAPFILEHEADER bfh; c)TPM/>(p  
 bfh.bfReserved1=bfh.bfReserved2=0; *v jmy/3  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2\A$6N ;_  
 bfh.bfSize=54+size; nX6u(U  
 bfh.bfOffBits=54; DkY4MH?  
 CFile bf; |"X*@s\'  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xaq-.IQAM$  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); }{K) 4M  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); W7R<%?  
  bf.WriteHuge(lpData,size); UN;H+gNnN  
  bf.Close(); 0U(@= 7V  
  nCount++; {3>$[bT  
 } Ga-k  
 GlobalFreePtr(lpData); ~drS} V  
 if(nCount==1) LvH 4{B  
  m_Number.Format("%d picture captured.",nCount); ~9,,~db  
 else DbBcQ%  
  m_Number.Format("%d pictures captured.",nCount); ~9a<0Mc?  
  UpdateData(FALSE); I+%[d^,  
} iTBx\ u%{  
 &=@IzmA  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) \+oQd=K@  
{ $B 2J T9  
 if(pMsg -> message == WM_KEYDOWN) o8V5w!+#  
 { ?(' wn<  
  if(pMsg -> wParam == VK_ESCAPE) GfxZ'VIn  
   return TRUE; fa jGZyd0:  
  if(pMsg -> wParam == VK_RETURN) :KSV4>X[%a  
   return TRUE; .;y.]Z/;  
 } Z, zWuE3  
 return CDialog::PreTranslateMessage(pMsg); aD<A.Lhy  
} Q 04al=  
y|C(X  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) qTRsZz@  
{ ,8S/t+H  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ -/wtI   
  SaveBmp(); tVYF{3BhA  
  return FALSE; :;RMo2Tl  
} YFLZ%(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s [RAHU  
 CMenu pop; :T ^a&)aL%  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4M=]wR;  
 CMenu*pMenu=pop.GetSubMenu(0); rT=rrvV3g  
 pMenu->SetDefaultItem(ID_EXITICON); {g'(~ qv  
 CPoint pt; <,3a3  
 GetCursorPos(&pt); BA@lk+aW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); FZ{h?#2?  
 if(id==ID_EXITICON) [SjqOTon{  
  DeleteIcon(); %+aCJu[k(z  
 else if(id==ID_EXIT) (+w*[qHe  
  OnCancel(); G)AqbY  
 return FALSE; MD}w Y><C  
} f&N gS+<K$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =J]&c?I  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ,Q3T Tno ,  
 AddIcon(); afCW(zH p  
 return res; /H[=5  
} Hck]aKI+  
fbyd"(V 8r  
void CCaptureDlg::AddIcon() a(m2n.0'>  
{ a kkNI3  
 NOTIFYICONDATA data; |0&IXOW"XF  
 data.cbSize=sizeof(NOTIFYICONDATA); /7(W?xOe  
 CString tip; paA(C|%{  
 tip.LoadString(IDS_ICONTIP); AwCcK6N1  
 data.hIcon=GetIcon(0); on!,c>nNa  
 data.hWnd=GetSafeHwnd(); HDz5&7* .  
 strcpy(data.szTip,tip); f$o_e90mu  
 data.uCallbackMessage=IDM_SHELL; *^pR%E .  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; w49t9~  
 data.uID=98; Fx]WCQo  
 Shell_NotifyIcon(NIM_ADD,&data); #>a\>iKQ2q  
 ShowWindow(SW_HIDE); S^JbyD_yoh  
 bTray=TRUE; 6gU96Z  
} pE3?"YO  
SJlr53  
void CCaptureDlg::DeleteIcon() rP'me2 B  
{ /`Ug9,*  
 NOTIFYICONDATA data; WqR&&gz  
 data.cbSize=sizeof(NOTIFYICONDATA); PF0_8,@U  
 data.hWnd=GetSafeHwnd(); ^Y?k0z  
 data.uID=98; #z'  
 Shell_NotifyIcon(NIM_DELETE,&data); mtpeRVcF  
 ShowWindow(SW_SHOW); T )&A2q  
 SetForegroundWindow(); [@_Jj3`4  
 ShowWindow(SW_SHOWNORMAL); +i6GHBn~J  
 bTray=FALSE; xBj 9y u  
} 1>.Ev,X+e  
VnSCz" ?3  
void CCaptureDlg::OnChange() 8$] 1M,$r  
{ x f'V{9*  
 RegisterHotkey(); "-E\[@/  
} &.F4 b~A7  
`{8K.(])s!  
BOOL CCaptureDlg::RegisterHotkey() 1;* cq  
{ <q)#  
 UpdateData(); K$z2YJ%  
 UCHAR mask=0; DVO.FTV^`  
 UCHAR key=0; j\ZXG=j  
 if(m_bControl)  > ^O7  
  mask|=4; \Zb;'eDv  
 if(m_bAlt) !@5 9)  
  mask|=2; x o;QCOH  
 if(m_bShift) iR HQ:Y!  
  mask|=1; I<DL=V  
  key=Key_Table[m_Key.GetCurSel()]; Do9x XK  
 if(bRegistered){ ,10=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }czrj%6  
  bRegistered=FALSE; E[OJ+ ;c  
 } )|cc X  
 cMask=mask; ]|#+zx|/D  
 cKey=key; 1l9 G[o *  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); BqEI(c 6  
 return bRegistered; )J=!L\  
} t <~h'U  
6]i-E>p3R  
  四、小结 ]iVcog"T  
y4yhF8E>;U  
  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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