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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: 3LxJ}>]TO  
  r{TNPa6!  
  一、实现方法 x$Oz0[  
B.G!7>=  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: f2u2Ns0Ym  
7wqwDE  
#pragma data_seg("shareddata") #NE^f2  
HHOOK hHook =NULL; //钩子句柄 "J.jmR;  
UINT nHookCount =0; //挂接的程序数目 P X0#X=$  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 }dHiW:J>  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 amSyGQ2  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )aC+qhh  
static int KeyCount =0; JdRs=#X  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 "_K 6=  
#pragma data_seg() C49 G&  
sXa8(xc  
  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。 *nc4X9  
d J!o/y6  
  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: -Fdi,\e  
C IDL{i8  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1v4kN -  
cKey,UCHAR cMask) bGJUu#  
{ 5QSmim  
 BOOL bAdded=FALSE; @j (jOe  
 for(int index=0;index<MAX_KEY;index++){ #TWc` 8  
  if(hCallWnd[index]==0){ <S}qcjG  
   hCallWnd[index]=hWnd; kW~F*  
   HotKey[index]=cKey; ry\']\k  
   HotKeyMask[index]=cMask; 10J*S[n1  
   bAdded=TRUE; YXtGuO\q  
   KeyCount++; UBVb#FNF  
   break; Ueeay^zN  
  } J50 ~B3bj`  
 } %_[-[t3  
 return bAdded; 9y5 \4&v  
} p~.@8r(  
//删除热键 <e^/hR4O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f UIs(}US  
{ KR}0(,Y  
 BOOL bRemoved=FALSE; &rl>{Uvq  
 for(int index=0;index<MAX_KEY;index++){ $Y`aS^IW  
  if(hCallWnd[index]==hWnd){ vVW=1(QWI#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ l(5-Cr  
    hCallWnd[index]=NULL; t0>{0 5  
    HotKey[index]=0; &~%@QC/  
    HotKeyMask[index]=0; N>R%0m<e  
    bRemoved=TRUE; ^ ?=K)  
    KeyCount--; nsT|,O  
    break; UW*aSZ/?  
   } ]#$kA9  
  } bIArAS9%  
 } ]~^/w}(K  
 return bRemoved; is(!_Iv  
} \uk#pL  
p4'"Wk8  
Q 8rtZ  
  DLL中的钩子函数如下: %wf|nnieZ  
p*0Ve21i,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)  IR LPUP  
{ E(tBN]W.  
 BOOL bProcessed=FALSE; +29\'w,  
 if(HC_ACTION==nCode) `0i3"06lr  
 { )DmiN^:  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 i6d$/ yP"  
   switch(wParam) UTQKlwPa  
   {  HD{`w1vcN  
    case VK_MENU: 5E!m! nBZ  
     MaskBits&=~ALTBIT; B`scuLl3  
     break; ]M(mq`K  
    case VK_CONTROL: 9oP{Al  
     MaskBits&=~CTRLBIT; *d@Hnu"q  
     break; yj~"C$s  
    case VK_SHIFT: E aD@clJS  
     MaskBits&=~SHIFTBIT; !XG&=Rd?  
     break; @vYmkF`  
    default: //judge the key and send message 'pY;]^M  
     break; 0s|LK  
   } Qs9U&*L  
   for(int index=0;index<MAX_KEY;index++){ rk/ c  
    if(hCallWnd[index]==NULL) X u):.0I  
     continue; dz|*n'd  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $NT9LtT@K  
    { !B lk=L+p  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o# xg:m_py  
     bProcessed=TRUE; ;a&:r7]=  
    } D:E~yh)$-  
   } (AG  
  } Wi?%)hur  
  else if((lParam&0xc000ffff)==1){ //有键按下 BozK!"R_<  
   switch(wParam) <83gn :$  
   { kI 3zYD^:  
    case VK_MENU: %vtSeJ  
     MaskBits|=ALTBIT; .4<U*Xkt  
     break; WrNgV@P  
    case VK_CONTROL: r ` &|)Hx  
     MaskBits|=CTRLBIT; mRH]'d lD7  
     break; 9JV 3  
    case VK_SHIFT: em [F|  
     MaskBits|=SHIFTBIT; "O[76}I+.q  
     break; L"h@`3o|  
    default: //judge the key and send message I#X2 UQzP  
     break; U%DF!~n  
   } }t2pIkF;  
   for(int index=0;index<MAX_KEY;index++){ b8Rh|"J)d  
    if(hCallWnd[index]==NULL) : W^\ mH  
     continue; =>0M3 Qh{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c^Jgr(Ow  
    { 0@K:Tq-mF  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Ig3(|{R  
     bProcessed=TRUE; loUwR z  
    } KVM@//:{  
   } (+LR u1z  
  } qH Ga  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ^:!(jiH  
   for(int index=0;index<MAX_KEY;index++){ Q|B|#?E==  
    if(hCallWnd[index]==NULL) ; eF4J  
     continue; [A9 ,!YY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [Z#.]gb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); p/1}>F|i  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 V$<G)dwUG5  
   } )L<?g !j~  
  } Z4AAg  
 } 1O2h9I$bk  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %DRy&k/T  
} ]jVSsSv  
pOVghllO  
  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: zrU$SWU  
.Spi$>v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QHzX 5$IM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .x!7  
gZ"{{#:}  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: >3`ctbe  
r\n h.}s  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) VuMDV6^Z  
{ N9=r#![>,  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) mu6xL QdA  
 { PyT}}UKj:  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 U aj`  
  SaveBmp(); Ac!&j=ZE  
  return FALSE; + %#MrNM'  
 } l?JO8^Nn  
 …… //其它处理及默认处理 @yn^6cE  
} %wjB)Mae  
(L0 hS'  
mrhp)yF  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 5Vqmv<F;$Z  
*[xNp[4EU  
  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。 dI0bTw|s/  
[ lzy &To  
  二、编程步骤 ]v@tZ}  
Iwt2}E(e  
  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"; R'9@A\7#  
%V%#y $l  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; JQ@`EV9,  
F%.9f Uo  
  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; *2Vp4  
&Ev]x2YC  
  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; Kcw1uLb  
9O=05CQ  
  5、 添加代码,编译运行程序。 o ?va#/fk  
3KG)6)1*  
三、程序代码 E7yf[/it  
N^Hn9n  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1V**QSZ1  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) XW~ BEa  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ tT* W5  
#if _MSC_VER > 1000 g2aT`=&Z  
#pragma once  w{ r(F`  
#endif // _MSC_VER > 1000 gl9pgY1ni  
#ifndef __AFXWIN_H__ @r/Id{pCI  
#error include 'stdafx.h' before including this file for PCH M8?#%x6;N  
#endif iVq#aXN  
#include "resource.h" // main symbols {wp Mg  
class CHookApp : public CWinApp 7/&C;"  
{ y/@;c)1b9  
 public: /+4^.Q*  
  CHookApp(); FU5LY XCs  
  // Overrides Z9"{f)T  
  // ClassWizard generated virtual function overrides -y l4tW  
  //{{AFX_VIRTUAL(CHookApp) KO-Zz&2f  
 public: miG; ]-"^  
  virtual BOOL InitInstance(); $&=4.7Yt  
  virtual int ExitInstance(); z^P* :  
  //}}AFX_VIRTUAL B;z>Dd,Y_x  
  //{{AFX_MSG(CHookApp) #0?"J)  
  // NOTE - the ClassWizard will add and remove member functions here. Zr.\`mG4f  
  // DO NOT EDIT what you see in these blocks of generated code ! @jE d%W  
  //}}AFX_MSG !Bk[p/\  
  DECLARE_MESSAGE_MAP() E?Qz/*'zv  
}; =M1a0i|d  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); #}/cM2m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QDjW!BsX3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C,|nmlDN  
BOOL InitHotkey(); yhSk"e'G  
BOOL UnInit(); _@#uIOcE  
#endif ;/?Z<[B  
>}<29Ii  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %Ye)8+-  
#include "stdafx.h" b:FEp'ZS  
#include "hook.h" yfM>8"h@  
#include <windowsx.h> V6@*\+:3)  
#ifdef _DEBUG DMAf^.,S  
#define new DEBUG_NEW `q f\3JT\  
#undef THIS_FILE 1A%N0#_(Md  
static char THIS_FILE[] = __FILE__; tDC0-N&6S~  
#endif ;#Jq$v)D  
#define MAX_KEY 100 ~j/bCMEf!  
#define CTRLBIT 0x04 1N!Oslum  
#define ALTBIT 0x02 <pTQpU  
#define SHIFTBIT 0x01 `7QvwXsH]  
#pragma data_seg("shareddata") ~^lH ^J   
HHOOK hHook =NULL; MtpU~c  
UINT nHookCount =0; MiSja#"+A  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey "ibK1}-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT lL:KaQ0E  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 6\,DnO   
static int KeyCount =0; t4f (Y,v  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift zB#_:(1qK  
#pragma data_seg() U{T[*s  
HINSTANCE hins; >W`S(a Mn  
void VerifyWindow(); ~rgf{oGz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) C<[d  
//{{AFX_MSG_MAP(CHookApp) w8 ?Pb$Fe  
// NOTE - the ClassWizard will add and remove mapping macros here. bGZ hUEq  
// DO NOT EDIT what you see in these blocks of generated code! ~/j$TT"  
//}}AFX_MSG_MAP 4 ss&'h  
END_MESSAGE_MAP() XGE 2J  
xb4Pt`x)rS  
CHookApp::CHookApp() {E3xI2  
{ <O \tC81  
 // TODO: add construction code here, 6Gs{nFw  
 // Place all significant initialization in InitInstance %^a]J"Ydi8  
} L!bfh`  
Zz"I.$$[M  
CHookApp theApp; 0V<Aub[${  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) x r-;,W  
{ Np.no$_  
 BOOL bProcessed=FALSE; Zg)_cRR   
 if(HC_ACTION==nCode) )ZT6:)  
 { 5z1\#" B[  
  if((lParam&0xc0000000)==0xc0000000){// Key up ~A8qeaP  
   switch(wParam) q%OcLZ<,  
   { p+orBw3  
    case VK_MENU: FjD,8^SQW  
     MaskBits&=~ALTBIT; Z{Vxr*9oO  
     break;  FovE$Dj]  
    case VK_CONTROL: OZ(Dpx(Q  
     MaskBits&=~CTRLBIT; a$C2}  
     break; Ho|o,XvLv  
    case VK_SHIFT: N7e`6d!  
     MaskBits&=~SHIFTBIT; ~gu=x&{  
     break; I*^5'N'  
    default: //judge the key and send message siZr@g!L  
     break; C-Nuy1o  
   } SV$nyV  
   for(int index=0;index<MAX_KEY;index++){ qq OxTG]  
    if(hCallWnd[index]==NULL) AI&qU/}  
     continue; \bU`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yJDeX1+,  
    { dv"as4~%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); f'1(y\_fb  
     bProcessed=TRUE; nAIH`L"X  
    } 5JS ZLC  
   } seu ~'s-  
  } z'7#"D  
  else if((lParam&0xc000ffff)==1){ //Key down q}#iV$dAj  
   switch(wParam) |:./hdcad  
   { Xl#Dw bx  
    case VK_MENU: TG1P=g5h  
     MaskBits|=ALTBIT; Ba/RO36&c  
     break; ,%A)"doaG  
    case VK_CONTROL: *R5`.j =  
     MaskBits|=CTRLBIT; t(}/g  
     break; ~V @;(_T  
    case VK_SHIFT: FXS^^p P  
     MaskBits|=SHIFTBIT; cb +l"FI7  
     break; uCw>}3  
    default: //judge the key and send message F 4GP7]  
     break; gh TcB  
   } 8jRs =I  
   for(int index=0;index<MAX_KEY;index++) 24/ /21m  
   { XAkK:}h  
    if(hCallWnd[index]==NULL) E[S? b=^  
     continue; q<n[.u1@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F;#zN  
    { (VR" Mi4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G;/Q>V  
     bProcessed=TRUE; 34z_+  
    } "\7v  
   } yB.G=90  
  } <O.Kqk* nq  
  if(!bProcessed){ doBNghS  
   for(int index=0;index<MAX_KEY;index++){ tE[H8  
    if(hCallWnd[index]==NULL) 4avc=Y5  
     continue; %Ys$@dB  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) C`)_i3 ^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); O#vn)+Y,*  
   } auRY|j  
  } /-Wuq`P/ T  
 } "l TZ|k^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &M[MEO`t8  
} ZP-dW|<[ x  
3 -tO;GKb  
BOOL InitHotkey() :V-k'hm &  
{ {-HDkG' 8  
 if(hHook!=NULL){ 0E-pA3M6  
  nHookCount++; @M=$qO_$9  
  return TRUE; !x7o|l|cP  
 } \]I  
 else 8"x9#kyU<3  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); FY8!g'.Oe  
  if(hHook!=NULL) Y.>kO  
   nHookCount++; gY!N3 *:  
  return (hHook!=NULL); L=RGL+f1 _  
} _%{0?|=  
BOOL UnInit() %%&e"&7HE  
{ oE1M/*myS  
 if(nHookCount>1){ {SJsA)9:#  
  nHookCount--; X]!D;7^  
  return TRUE; I+|uU g5  
 } ]KWK}Zyi  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h$pk<<  
 if(unhooked==TRUE){ ys%zlbj[  
  nHookCount=0; 09d9S`cS\  
  hHook=NULL; xI?0N<'.*q  
 } eRs&iK2y  
 return unhooked; xdZ<| vMR  
} mZ7B<F[qV  
0oSQY[ht/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p>q&&;fe  
{ 7(Cx!Yb  
 BOOL bAdded=FALSE; V.8%|-d  
 for(int index=0;index<MAX_KEY;index++){ vM(Xip7  
  if(hCallWnd[index]==0){ !MoOKW  
   hCallWnd[index]=hWnd; Yl~$V(  
   HotKey[index]=cKey; "]#'QuR  
   HotKeyMask[index]=cMask; ($62o&I  
   bAdded=TRUE; *g_w I%l  
   KeyCount++; @r<b:?u  
   break; =WK04\H  
  } J=iRul^S  
 } 89Z#|#uM5  
 return bAdded; hbI;Hd  
} (rcMA>2=  
hm\\'_u  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u]E.iXp  
{ ;1`!wG-DD  
 BOOL bRemoved=FALSE; 1HbFtU`y~  
 for(int index=0;index<MAX_KEY;index++){ E]1##6Ae  
  if(hCallWnd[index]==hWnd){ V&*D~Jq  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){   WK==j1  
    hCallWnd[index]=NULL; s?c JV `  
    HotKey[index]=0; 5/?P|T   
    HotKeyMask[index]=0; ]JdJe6`Mc  
    bRemoved=TRUE; ,?(ciO)  
    KeyCount--; `\N]wlB2/b  
    break; Xwq]f :@V  
   } j;\[pg MR/  
  } Ie@Jb{ x  
 } ;iU%Kt  
 return bRemoved; JoJukoy}F  
} DnFjEP^  
XA{F:%  
void VerifyWindow() ` 1+%}}!$u  
{ VRbQdiZ{  
 for(int i=0;i<MAX_KEY;i++){ ~}Z'0W)Q`z  
  if(hCallWnd!=NULL){ %(<(Y  
   if(!IsWindow(hCallWnd)){ aGK@)&h$  
    hCallWnd=NULL; xS8,W  
    HotKey=0; _TUm$#@Y`  
    HotKeyMask=0; sbnjy"Z%  
    KeyCount--; o=_c2m   
   } RlRs}yF  
  } VEs5;]#<2D  
 } G\=_e8(  
} Kkv<"^H  
Z\ )C_p\-  
BOOL CHookApp::InitInstance() %;|0  
{ UpfZi9v?W  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); z vO:"w}  
 hins=AfxGetInstanceHandle(); W5SNI>|E  
 InitHotkey(); &= eYr{  
 return CWinApp::InitInstance(); 8(lR!!=q  
} ^DB{qU  
S6sq#kcH  
int CHookApp::ExitInstance() @AQwr#R"l  
{ `}fw1X5L  
 VerifyWindow(); C:i|-te  
 UnInit(); @i LIU}+  
 return CWinApp::ExitInstance(); kOjf #@c  
} D4Etl5k  
(=c1  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h@1!T  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) q0./O|Dj   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .H~YI  
#if _MSC_VER > 1000 7\Fs=\2l+'  
#pragma once b>11h  
#endif // _MSC_VER > 1000 fS=hpL6]@  
iw\%h9  
class CCaptureDlg : public CDialog tFM$#JN  
{ 57Z-  
 // Construction ;Vu5p#,O<M  
 public: RMP9y$~3pU  
  BOOL bTray; : ]WqfR)#  
  BOOL bRegistered; Zu/<NC (  
  BOOL RegisterHotkey(); +Qj(B@ i  
  UCHAR cKey; $,27pkwHeW  
  UCHAR cMask; f.6~x$:)`E  
  void DeleteIcon(); rs-,0'z,7  
  void AddIcon(); 73F5d/n  
  UINT nCount; Y)|N"f;  
  void SaveBmp(); FvdeQsc!  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor {5j66QFoo  
  // Dialog Data fex,z%}p  
  //{{AFX_DATA(CCaptureDlg) <1"+,}'x  
  enum { IDD = IDD_CAPTURE_DIALOG }; )L5i&UK.  
  CComboBox m_Key; X.FGBR7=q  
  BOOL m_bControl; )rm4cW_  
  BOOL m_bAlt; Or0O/\D)  
  BOOL m_bShift; f_=~H<j!  
  CString m_Path; ,S&z<S_  
  CString m_Number; k'3Wt*i  
  //}}AFX_DATA 6.c^u5;  
  // ClassWizard generated virtual function overrides Z?G&.# :  
  //{{AFX_VIRTUAL(CCaptureDlg) Vba.uKNjk  
 public: (zcLx;N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); M(Zc^P}N  
 protected: ,wAz^cK|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $}o b,i^W  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sa&) #Z:  
  //}}AFX_VIRTUAL 3tAU?sV!  
  // Implementation bt/ =Kq#  
 protected: T+IF}4e d  
  HICON m_hIcon; /)L 0`:I#  
  // Generated message map functions ;zH HIdQ>-  
  //{{AFX_MSG(CCaptureDlg) _NZ@4+aW  
  virtual BOOL OnInitDialog(); `{Tk@A_yd  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); oBQm05x"  
  afx_msg void OnPaint(); ZH 6\><My  
  afx_msg HCURSOR OnQueryDragIcon(); h2Bz F  
  virtual void OnCancel(); fV\]L4%  
  afx_msg void OnAbout(); DN] v_u+}  
  afx_msg void OnBrowse(); "TOa=Tt{,  
  afx_msg void OnChange(); kg97S  
 //}}AFX_MSG PnYBy| yl  
 DECLARE_MESSAGE_MAP() H17-/|-;0!  
}; qxOi>v0\H  
#endif b #fTAC;<  
Ea $aUORm  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file (eWPis[  
#include "stdafx.h" YN/ }9.  
#include "Capture.h" [g|Y7.j8  
#include "CaptureDlg.h" &qM[g 9  
#include <windowsx.h> gABr@>Vv  
#pragma comment(lib,"hook.lib") {y)s.b~JB  
#ifdef _DEBUG )Kd%\PP  
#define new DEBUG_NEW |CFRJN-J"  
#undef THIS_FILE 3G}AH E4  
static char THIS_FILE[] = __FILE__;  C})'\1O%  
#endif Zyf P; &  
#define IDM_SHELL WM_USER+1 {w6/[ -^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `Ityi}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .ic:`1  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; OQ&'Dti  
class CAboutDlg : public CDialog RP4Ku9hk  
{ ` uCIXb  
 public: {FO$yw=>  
  CAboutDlg(); 5 `/< v^  
  // Dialog Data rf &M!d}!  
  //{{AFX_DATA(CAboutDlg) %3r:s`{  
  enum { IDD = IDD_ABOUTBOX }; qoMfSz"(  
  //}}AFX_DATA V@-)\RZm  
  // ClassWizard generated virtual function overrides zbkMFD.{y  
  //{{AFX_VIRTUAL(CAboutDlg) )?! [}t  
 protected: C~% 1w%nn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s#9Ui#[=h  
  //}}AFX_VIRTUAL SGL|Ck  
  // Implementation \*t~==WB  
 protected: Y"g.IK`V  
  //{{AFX_MSG(CAboutDlg)  AnBJ(h  
  //}}AFX_MSG G\d$x4CVGc  
  DECLARE_MESSAGE_MAP() 8jlLUG:g  
}; yY).mxRN  
4'1m4Ugg  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) /b#l^x:j  
{ I^\&y(LJF  
 //{{AFX_DATA_INIT(CAboutDlg) 08bJCH  
 //}}AFX_DATA_INIT R"v 3!P  
} nAJdr*`a,5  
V N{NA+I  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) rh*sbZ68>E  
{ 1Tp/MV/>  
 CDialog::DoDataExchange(pDX); K>:]Bx#F7  
 //{{AFX_DATA_MAP(CAboutDlg) k;W@LfP  
 //}}AFX_DATA_MAP cf_|nL#9  
} x3+oAb@o/  
d~J-|yyT  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Hy:V`>  
 //{{AFX_MSG_MAP(CAboutDlg) B5%n(,Lx  
 // No message handlers 72uz<i!&$  
 //}}AFX_MSG_MAP 2-*V=El  
END_MESSAGE_MAP() q/9H..6  
^ <`(lyph  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) @D^^_1~  
: CDialog(CCaptureDlg::IDD, pParent) u^Ku;RQo  
{ U @v*0  
 //{{AFX_DATA_INIT(CCaptureDlg) PXoz*)tk  
  m_bControl = FALSE; ?4H#G)F  
  m_bAlt = FALSE; Z6C=T;w  
  m_bShift = FALSE; VXBY8;+Yp  
  m_Path = _T("c:\\"); pO  Iq%0]  
  m_Number = _T("0 picture captured."); eDI= nSo  
  nCount=0; 8LkP)]4^sO  
  bRegistered=FALSE; IA zZ1#/3  
  bTray=FALSE; W<ZK,kv  
 //}}AFX_DATA_INIT ^>x|z.  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 6DIZ@oi  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~5 N)f UI\  
} -/C)l)V}  
T  VmH  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) sb_oD{+gW  
{ lT&wOm3  
 CDialog::DoDataExchange(pDX); ^g1f X1  
 //{{AFX_DATA_MAP(CCaptureDlg) S{]7C?4`  
  DDX_Control(pDX, IDC_KEY, m_Key); 0-Y:v(|.  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Jq.lT(E8D  
  DDX_Check(pDX, IDC_ALT, m_bAlt); O=cxNy-I  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ,fDEz9-,  
  DDX_Text(pDX, IDC_PATH, m_Path); `^JJ&)4iv  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4BYE1fUzd  
 //}}AFX_DATA_MAP EI>6Nh  
} \`V$ 'B{.  
'7Nr8D4L  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Y/<lWbj*A  
//{{AFX_MSG_MAP(CCaptureDlg) '+>fFM,*B  
 ON_WM_SYSCOMMAND() F7L&=K$2y  
 ON_WM_PAINT() 7M_U2cd|TD  
 ON_WM_QUERYDRAGICON() gbeghLP[?  
 ON_BN_CLICKED(ID_ABOUT, OnAbout)  YpAg  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |'ln?D:&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 8b.u'r174  
//}}AFX_MSG_MAP W W2Ob*  
END_MESSAGE_MAP() ?<&O0'Q  
 kqYa*| l  
BOOL CCaptureDlg::OnInitDialog() c !ZM  
{ yq-=],h  
 CDialog::OnInitDialog(); 5RH2"*8T  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >Iewx Gb>  
 ASSERT(IDM_ABOUTBOX < 0xF000); ,Y?sfp  
 CMenu* pSysMenu = GetSystemMenu(FALSE); =\#%j|9N9  
 if (pSysMenu != NULL) {gA\ph% s  
 { sbkQ71T:  
  CString strAboutMenu; }eQRN<}P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); '3]p29v{  
  if (!strAboutMenu.IsEmpty()) g[ 0<m#"  
  { )0vU k  
   pSysMenu->AppendMenu(MF_SEPARATOR); _\PNr.D 8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o}Odw;  
  } -4w=s|#.\  
 } n~V4nj&_T  
 SetIcon(m_hIcon, TRUE); // Set big icon 1(zsOeX  
 SetIcon(m_hIcon, FALSE); // Set small icon H7U li]e3  
 m_Key.SetCurSel(0); ,t{,_uPJY  
 RegisterHotkey(); )3YtIH_  
 CMenu* pMenu=GetSystemMenu(FALSE); 4h!f/aF'  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ,/&'m13b/L  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); t>GfM  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (bOpV>\Q7  
 return TRUE; // return TRUE unless you set the focus to a control etT +  
} H.<a`m m8  
e~ aqaY~}  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) [3l*F  
{ CM)Q&:  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) FlfI9mm  
 { zl-2$}<a  
  CAboutDlg dlgAbout; cfox7FmW  
  dlgAbout.DoModal(); ]eQV ,Vt  
 } {8,<ZZ_  
 else 5(W"-A}  
 { YCe7<3>J4  
  CDialog::OnSysCommand(nID, lParam); TSAU?r\P  
 } & gJV{V5Ay  
} ""Zp:8o  
^J Z^>E~  
void CCaptureDlg::OnPaint() \ \BCcr\l  
{ 9YsR~SM  
 if (IsIconic()) Qu=LnGo~P  
 {  nVu&/  
  CPaintDC dc(this); // device context for painting f)c~cJz<q  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Q$obOEr2(  
  // Center icon in client rectangle )%SkJ  
  int cxIcon = GetSystemMetrics(SM_CXICON); x:vu'A  
  int cyIcon = GetSystemMetrics(SM_CYICON); /( .6bv  
  CRect rect; ;!91^Tl  
  GetClientRect(&rect); k4qp u=@U  
  int x = (rect.Width() - cxIcon + 1) / 2; GU't%[  
  int y = (rect.Height() - cyIcon + 1) / 2; jztq.2-c#  
  // Draw the icon 9jN)I(^D6  
  dc.DrawIcon(x, y, m_hIcon); R(P%Csbqh  
 } xvzr:p P  
 else -yGDh+-  
 { ,*4p?|A  
  CDialog::OnPaint(); ZT02"3F  
 } V._6=ZJ  
} "G-1>:   
aK,z}l(N  
HCURSOR CCaptureDlg::OnQueryDragIcon() gH2,\z`[4  
{ B63pgPX  
 return (HCURSOR) m_hIcon; 8ul&x~2;X  
} 8<mjh0F-,  
*5zrZ]^  
void CCaptureDlg::OnCancel() e *(b  
{ \;VhYvEH  
 if(bTray) ve ~05mg  
  DeleteIcon(); M3p   
  CDialog::OnCancel(); hS[ yNwD  
} t1VH doNN  
J};z85B  
void CCaptureDlg::OnAbout() 2<&Bw2  
{ -p-B2?)A  
 CAboutDlg dlg; 2([2Pb3<"  
 dlg.DoModal(); &U+ _ -Ph  
} \BWyk A>  
Auy_K?he]  
void CCaptureDlg::OnBrowse() ZcuA6#3B  
{ \MxoZ  
 CString str; QKN<+,h!z>  
 BROWSEINFO bi; DC1'Kyk  
 char name[MAX_PATH]; =0 @&GOq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); &t5{J53  
 bi.hwndOwner=GetSafeHwnd(); iX'rU@C  
 bi.pszDisplayName=name; Lokl2o `  
 bi.lpszTitle="Select folder"; t+,4Ya|Xj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /8VP[i)u  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); g8!wb{8?s  
 if(idl==NULL) H Te<x  
  return; K:' q>D@  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }M1sksk5  
 str.ReleaseBuffer(); ZEYgK)^  
 m_Path=str; |F.)zC5{  
 if(str.GetAt(str.GetLength()-1)!='\\') 7?B.0>$3>V  
  m_Path+="\\"; o!:8nXw  
 UpdateData(FALSE); b 1&i#I?{  
} K^_i%~  
9]t[J_YM  
void CCaptureDlg::SaveBmp() BmHwu{n'  
{ tO_H!kP  
 CDC dc; "Jjs"7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); zEZLKWm9-  
 CBitmap bm; 0!z@2[Pe66  
 int Width=GetSystemMetrics(SM_CXSCREEN); 0Ok,oW {  
 int Height=GetSystemMetrics(SM_CYSCREEN); Qb8KPpd  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ZVeaTK4_ t  
 CDC tdc; ZoKcJA  
 tdc.CreateCompatibleDC(&dc); :V2bS  
 CBitmap*pOld=tdc.SelectObject(&bm); 6t/`:OZC:  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); SI:U0gUc  
 tdc.SelectObject(pOld); m/NdJMoN=  
 BITMAP btm; 3] 1-M  
 bm.GetBitmap(&btm); FWH}j0Gj|  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; j3q~E[Mz\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); E7Cy(LO  
 BITMAPINFOHEADER bih; = 8gHS[  
 bih.biBitCount=btm.bmBitsPixel; zI~owK)%Z  
 bih.biClrImportant=0; 47r_y\U h  
 bih.biClrUsed=0; `OymAyEYQ  
 bih.biCompression=0; \7"@RHcihB  
 bih.biHeight=btm.bmHeight; K78rg/`  
 bih.biPlanes=1; 86f2'o+  
 bih.biSize=sizeof(BITMAPINFOHEADER); 65ly2gl  
 bih.biSizeImage=size; fC}R4f7C  
 bih.biWidth=btm.bmWidth; L6>pGx  
 bih.biXPelsPerMeter=0; ,G#.BLH cX  
 bih.biYPelsPerMeter=0; g'];Estb~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 9 2MTX Osp  
 static int filecount=0; '8Phxx|  
 CString name; |*RYq2y  
 name.Format("pict%04d.bmp",filecount++); T5Dw0Y6u,  
 name=m_Path+name; Th`skK&U  
 BITMAPFILEHEADER bfh; S osj$9E  
 bfh.bfReserved1=bfh.bfReserved2=0; 1b8p~-LsU  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 10#oG{ 9  
 bfh.bfSize=54+size; VL' fP2  
 bfh.bfOffBits=54; R:p62c;Tv0  
 CFile bf; MxzLK%am  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Knhp*V?  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); q9"=mO0J+  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &D%(~|'  
  bf.WriteHuge(lpData,size); 0J.dG/I%  
  bf.Close(); zi~5l#I  
  nCount++; ?S?2 0  
 } H A}f,),G  
 GlobalFreePtr(lpData); ,3I^?5  
 if(nCount==1) $./bjV%  
  m_Number.Format("%d picture captured.",nCount); oJKa"H-jL  
 else "m{,~'x  
  m_Number.Format("%d pictures captured.",nCount); 7VK}Dy/Vvn  
  UpdateData(FALSE); .oEmU+  
} [P |[vWO  
1_$xSrwcF  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) nN$Y(2ZN  
{ 8Ry74|`=R  
 if(pMsg -> message == WM_KEYDOWN) Ax oD8|  
 { M5T9JWbN  
  if(pMsg -> wParam == VK_ESCAPE) xoB},Xl$D  
   return TRUE; k%[3Q>5iM  
  if(pMsg -> wParam == VK_RETURN) ~lEVXea!  
   return TRUE; %AF5=  
 } ,wKe fpV;5  
 return CDialog::PreTranslateMessage(pMsg); "l={)=R  
} tweY'x.{  
_WX#a|4h{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 569}Xbc/  
{ vi@Lz3}::  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 39 {{7(hh  
  SaveBmp(); B7\k< Nit0  
  return FALSE; k7tYa;C  
} .^) UO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s08u @  
 CMenu pop; rzp +:  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); bYe;b><G  
 CMenu*pMenu=pop.GetSubMenu(0); Oo?,fw  
 pMenu->SetDefaultItem(ID_EXITICON); 4E44Hzs  
 CPoint pt; Y+/JsOD  
 GetCursorPos(&pt); D .vw8H3  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j QU"Ved  
 if(id==ID_EXITICON) K!D o8|  
  DeleteIcon(); P?BGBbC  
 else if(id==ID_EXIT) {f9{8-W <u  
  OnCancel(); ~_9"3,~o5  
 return FALSE; 0=wK:Ex  
} W:i?t8y\y  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); X5YiFLH>y\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PLM_#+R>  
 AddIcon(); xr0haN\p"  
 return res; $o@R^sJ  
} \qi|Js*{  
]E3U J!!  
void CCaptureDlg::AddIcon() UDf9FnG}L  
{ c= UU"  
 NOTIFYICONDATA data; 8#R?]Uwq  
 data.cbSize=sizeof(NOTIFYICONDATA); f[gqT yiP  
 CString tip; G0n'KB  
 tip.LoadString(IDS_ICONTIP); l0*Gb  
 data.hIcon=GetIcon(0); ? _\$  
 data.hWnd=GetSafeHwnd(); 7dihVvL $  
 strcpy(data.szTip,tip); QbhW!9(,  
 data.uCallbackMessage=IDM_SHELL; DaNW~rd{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; wo5ZxM  
 data.uID=98; ]IJRnVp%  
 Shell_NotifyIcon(NIM_ADD,&data); ^"8G`B$r  
 ShowWindow(SW_HIDE); T~sTBGcv  
 bTray=TRUE; {#IPf0O  
} CeT~p6=  
mq/zTm  
void CCaptureDlg::DeleteIcon() "S~_[/q  
{ 6]Q3Yz^h  
 NOTIFYICONDATA data; FDR1 Gy  
 data.cbSize=sizeof(NOTIFYICONDATA); ]43[6Im  
 data.hWnd=GetSafeHwnd(); dsK&U\ej}  
 data.uID=98; F?Ju?? O  
 Shell_NotifyIcon(NIM_DELETE,&data); \^*< y-jL  
 ShowWindow(SW_SHOW); Y^$HrI(vq  
 SetForegroundWindow(); <(@Syv)  
 ShowWindow(SW_SHOWNORMAL); h%d^Gq~  
 bTray=FALSE;  &O[s:  
} Fb2%!0i  
_RMQy~&b  
void CCaptureDlg::OnChange() ~ aZedQc  
{ {TXOQ>gY  
 RegisterHotkey(); $#o1MX  
} JM0I(%Z%  
v}Wmd4Y'  
BOOL CCaptureDlg::RegisterHotkey() Bz8 &R|~>"  
{ eX&Gw{U-f  
 UpdateData(); ~E4"}n[3A#  
 UCHAR mask=0; oN[Th  
 UCHAR key=0; b hjZ7=  
 if(m_bControl) "$p#&W69"J  
  mask|=4; H;<!TX.zD  
 if(m_bAlt) HU B|bKy  
  mask|=2; TOl}U  
 if(m_bShift) YHxbDf dA  
  mask|=1; #nyv+x;  
  key=Key_Table[m_Key.GetCurSel()]; ~#M d"3  
 if(bRegistered){ 'p)Q68;&  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); =4C}{IL  
  bRegistered=FALSE; j'Y / H5  
 } Ex@`O+  
 cMask=mask; tP ~zKU  
 cKey=key; 3bC yTZk  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }{7e7tW6  
 return bRegistered; #*q2d  
} s #:%x#  
c yQ(fIYl  
  四、小结 HgJb4Fi  
'TN)Lb*  
  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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