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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: B^fT>1P  
  ?  -3\  
  一、实现方法 fW?sYC'  
 ~,"N[Q  
  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: B8T\s)fxnX  
+4et7  
#pragma data_seg("shareddata") $&hN*7Ts  
HHOOK hHook =NULL; //钩子句柄 p3c"ZPO~z  
UINT nHookCount =0; //挂接的程序数目 %r%So_^  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Qzqc .T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 a+`D'?z  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey BkawL,  
static int KeyCount =0; 3JO]f5  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 }aF  
#pragma data_seg() *5k+t  
wv?RO*E  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 BcQEG *N  
h}Rx_d  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: i?>tgmu.  
~.^AL}zm_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ?cKZ_c  
cKey,UCHAR cMask) VWx]1\  
{ xzsdG?P  
 BOOL bAdded=FALSE; IA4N@ijRxh  
 for(int index=0;index<MAX_KEY;index++){ /c`^iPb  
  if(hCallWnd[index]==0){ 1l5J P|x  
   hCallWnd[index]=hWnd; 7]E m ,  
   HotKey[index]=cKey; s"%lFA"-  
   HotKeyMask[index]=cMask; bFY~oa%C  
   bAdded=TRUE; ba3*]01Yb  
   KeyCount++; LY 0]l$  
   break; ,\YAnKn6_  
  } mM_ k ^4:  
 } w##^}nHOR  
 return bAdded; nirDMw[  
} A#rh@8h+  
//删除热键 fE]XWA4U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Zd!U')5/  
{ =Mj 0:rW  
 BOOL bRemoved=FALSE; =dZHYO^Cv  
 for(int index=0;index<MAX_KEY;index++){ * **a2Z/(  
  if(hCallWnd[index]==hWnd){ uo2'"@[e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ! zL1;d  
    hCallWnd[index]=NULL; aS84n.?vq  
    HotKey[index]=0; Io  n~  
    HotKeyMask[index]=0; NBYH;h P  
    bRemoved=TRUE; X(@uwX$m  
    KeyCount--; -MBV $:_R  
    break; 4;<ut$G  
   } Dnw|%6Y  
  } Fh8lmOL;?  
 } 8R/dA<Ww  
 return bRemoved; 3BG>Y(v  
} E{?au]y$J  
*bd[S0l  
$, 3J7l3  
  DLL中的钩子函数如下: = &tmP  
-C-yQ.>\T#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )Ry<a$Q3  
{ B07v^!Z>  
 BOOL bProcessed=FALSE; ]p7jhd=  
 if(HC_ACTION==nCode) `d\r;cE%lm  
 { 'n;OB4  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 :|+Qe e  
   switch(wParam) Qm4o7x{q  
   {  1oiRWRe  
    case VK_MENU: P 43P]M2  
     MaskBits&=~ALTBIT; jYRP8 Yi  
     break; n]}W``=7  
    case VK_CONTROL: piy`zc- yu  
     MaskBits&=~CTRLBIT; Fv74bC %  
     break; rG}\Zjn{  
    case VK_SHIFT: r [:   
     MaskBits&=~SHIFTBIT; EV pi^>M  
     break; 3"N)xO-  
    default: //judge the key and send message ?e[lr>-  
     break; m_+sR!\H8  
   } ntFT>g{B  
   for(int index=0;index<MAX_KEY;index++){ H@bf'guA|B  
    if(hCallWnd[index]==NULL) p]T<HGJ P  
     continue; 1y#D?R=E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) $+p?Y)h .  
    { #>lG7Ns|4  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ':{>a28=  
     bProcessed=TRUE; Ae]sGU|?'  
    } 7x);x/#8Z  
   } %D$]VSP;  
  } i4Lc$20?d  
  else if((lParam&0xc000ffff)==1){ //有键按下 AIMSX]m  
   switch(wParam) I9h ?;(  
   { |L2SFB?d=  
    case VK_MENU: y!tC20Q   
     MaskBits|=ALTBIT; CI353-`  
     break; %\]* OZ7  
    case VK_CONTROL: *Kdda} J+  
     MaskBits|=CTRLBIT; *na?n2Yzt  
     break; <sK4#!K  
    case VK_SHIFT: Mmpfto%i  
     MaskBits|=SHIFTBIT; }PTV] q%  
     break; hxQqa 0B  
    default: //judge the key and send message _SW3_8SuM.  
     break; BauU{:Sh  
   } C8 \5A8c  
   for(int index=0;index<MAX_KEY;index++){ M5gWD==uP  
    if(hCallWnd[index]==NULL) :#@= B]  
     continue; 7}M2bH} \K  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) O T.*pk+<)  
    { $Y69@s%f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ;)N>t\v  
     bProcessed=TRUE; wF((  
    } EoK~S\dS  
   } '!/<P"5t  
  } KQB3 m"  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 UQ{L{H   
   for(int index=0;index<MAX_KEY;index++){ Z&;uh_EC  
    if(hCallWnd[index]==NULL) vZ.x{"n'~  
     continue; [Xb@Wh:yG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 9eH$XYy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); u~A6bK*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 BNL;Biy t7  
   } uEX!xx?Q#  
  } g$b<1:8  
 } dCRyOid$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /~zai}  
} 8F._9U-EN  
&Z`#cMR{H  
  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: hCC<?5q  
#B4%|v;`E?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); +E{|63~q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '&\kxNglJ  
\[y`'OD~  
  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: ~]QHk?[wc  
/5u<78GW1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4O35 "1  
{ =3L;Z[^9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) x QIq^/F0  
 { 2 B  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 p6;OL@ \~  
  SaveBmp(); ,^C--tgZJg  
  return FALSE; ZzSz%z_sE  
 } 8uWa=C)  
 …… //其它处理及默认处理 97}OL`y  
} "'t0h{W r8  
.>WxDQIo  
C#Na&m  
  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。 ; #&yn=^  
XT4{Pe7{[P  
  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。 (L/_^!ZX  
O6LS(5j2  
  二、编程步骤 "vOwd.(?N  
L U={")TdQ  
  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"; ]"?)Z  
@0/+_2MH-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; PK`D8)=u  
t+!$[K0/  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; JsODzw  
^zQ/mo,Z  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 8|\8O@  
a6uJYhS~  
  5、 添加代码,编译运行程序。 xCc[#0R{  
fTK3,s1=  
三、程序代码 /w}u3|L$  
t:'Mh9h7u  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL wY[+ZT  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) NU5.o$  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ OG>}M$ Ora  
#if _MSC_VER > 1000 w|K'M?N14  
#pragma once 4bYK}o S  
#endif // _MSC_VER > 1000 ,Ge"anO  
#ifndef __AFXWIN_H__ z?R|Ok  
#error include 'stdafx.h' before including this file for PCH !WQ-=0cm  
#endif oYm[V<nIl  
#include "resource.h" // main symbols nH[yJGZYSA  
class CHookApp : public CWinApp pSdI/Vj'=  
{ @eKec1<  
 public: ddJe=PUb  
  CHookApp(); /7Cc#P6  
  // Overrides K3#@SY j  
  // ClassWizard generated virtual function overrides #ML%ij 1  
  //{{AFX_VIRTUAL(CHookApp) ]H+8rY%+  
 public: n<z [J=I  
  virtual BOOL InitInstance(); 4\8+9b\9"  
  virtual int ExitInstance(); 1cpiHZa  
  //}}AFX_VIRTUAL !ug8SAOaz/  
  //{{AFX_MSG(CHookApp) d,B:kE0Y  
  // NOTE - the ClassWizard will add and remove member functions here. sN9&,&W1  
  // DO NOT EDIT what you see in these blocks of generated code ! BHU6t<G  
  //}}AFX_MSG KUlp"{a`,K  
  DECLARE_MESSAGE_MAP() 3sy (vC  
}; ;;6uw\6 O  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !Fd~~v  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RAgg:3^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); C26>BU<  
BOOL InitHotkey(); 3u*4o=4e  
BOOL UnInit(); \o*5  
#endif )<h*eS{  
'h|DO/X~L  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. P2#XKG  
#include "stdafx.h" K8GP@yD]M  
#include "hook.h" nxnv,AZG  
#include <windowsx.h> W{6|tx)  
#ifdef _DEBUG Y 5- F@(  
#define new DEBUG_NEW $5aV:Z3P  
#undef THIS_FILE z[L8$7L  
static char THIS_FILE[] = __FILE__; !Prg_6 `  
#endif v$?+MNks  
#define MAX_KEY 100 | *2w5iR  
#define CTRLBIT 0x04 1WxK#c-)  
#define ALTBIT 0x02 $P/~rZ@M@  
#define SHIFTBIT 0x01 Vc\MV0lr  
#pragma data_seg("shareddata") rWa2pO  
HHOOK hHook =NULL; !Qu"BF   
UINT nHookCount =0; 9PXFRxGA  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey -#u=\8  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT %)zodf  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r!_-"~`7E  
static int KeyCount =0; CQF:Rnb  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 5Ha9lM2gh  
#pragma data_seg() 5q3JI  
HINSTANCE hins; gmw|H?]  
void VerifyWindow(); cQCSe,$ W  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) G|!Tj X7s  
//{{AFX_MSG_MAP(CHookApp) |"ls\ 7  
// NOTE - the ClassWizard will add and remove mapping macros here. Yvw(t j5_5  
// DO NOT EDIT what you see in these blocks of generated code! ayR-\mZ  
//}}AFX_MSG_MAP &^ 1$^=  
END_MESSAGE_MAP() +" .X )avF  
!Xf5e*1IS  
CHookApp::CHookApp() `u3EU*~W  
{ BC&S>#\  
 // TODO: add construction code here, N{9v1`B  
 // Place all significant initialization in InitInstance gc_:%ki  
} il4^zj82  
#+ 0M2Sa  
CHookApp theApp; yVU^M?`#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ]!?;@$wx  
{ e^6)Zz1\  
 BOOL bProcessed=FALSE; <wN}X#M  
 if(HC_ACTION==nCode) Y,<{vLEC  
 { ]7W&JKmA&  
  if((lParam&0xc0000000)==0xc0000000){// Key up :~&~y-14  
   switch(wParam) FH?U(-  
   { \)#kquH/l  
    case VK_MENU: 1H? u Qy  
     MaskBits&=~ALTBIT; ?~BC#B\>o  
     break; Gw/Pk4R  
    case VK_CONTROL: S 6@u@C  
     MaskBits&=~CTRLBIT; 4KhV|#-;k  
     break; i1ixi\P{0  
    case VK_SHIFT: 6tgt>\y  
     MaskBits&=~SHIFTBIT; -`*a'p-=  
     break; :%t U'w  
    default: //judge the key and send message ?pW`cFLDHF  
     break; GZN ^k+w  
   } eVjBGJ=2e  
   for(int index=0;index<MAX_KEY;index++){ <=zQ NBtx  
    if(hCallWnd[index]==NULL) n\Z!ff/  
     continue; _<n~n]%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZCMw3]*  
    { w1EXh  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -; s|  
     bProcessed=TRUE; xI#9  
    } !#], hok8X  
   } oR)Jznmi}  
  } @Q)OGjaq  
  else if((lParam&0xc000ffff)==1){ //Key down @'#,D!U  
   switch(wParam) UdT *E: 6  
   { %a>&5V  
    case VK_MENU: Si2k"<5 U  
     MaskBits|=ALTBIT; @>r._ ~  
     break; >c1qpk/  
    case VK_CONTROL: `x+ B+)0X  
     MaskBits|=CTRLBIT; [%"|G9  
     break; |GdUL%1hnC  
    case VK_SHIFT: n,vct<&z@  
     MaskBits|=SHIFTBIT; xK *b1CB  
     break; Qf~vZtJ+J  
    default: //judge the key and send message ~Z\8UsVN  
     break; c,np2myd  
   } sJB;3"~  
   for(int index=0;index<MAX_KEY;index++) :KQ~Cb  
   { I:R[;TB?y  
    if(hCallWnd[index]==NULL) ?ZV/U!y  
     continue; 6KXtcXQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /hr7NT{e%v  
    { hQ,ch[j'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); RuL i,'u  
     bProcessed=TRUE; ity & v 9  
    } <T` 7%$/E  
   } ($q-_m  
  } "Gsc;X'id  
  if(!bProcessed){ *>Ns_su7W  
   for(int index=0;index<MAX_KEY;index++){ i?p$H0b n  
    if(hCallWnd[index]==NULL) |kyX3~  
     continue; ~8q)^vm>f?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) [+rfAW>p}  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); F|S Xn\  
   } dPW#C5dm  
  } tqz3zIQ  
 } 3+)J @(a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3 ]5^r}  
} #3i3G(mQ  
[;n9:Qxf  
BOOL InitHotkey() +F R0(T  
{ H*d9l2,KZS  
 if(hHook!=NULL){ Mo|;'+  
  nHookCount++; k0OYJ/  
  return TRUE; =:xW>@bh|  
 } L7n D|  
 else  L O}@dL  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); f}o\*|k_|  
  if(hHook!=NULL) td(li.,  
   nHookCount++; >~''&vdsk\  
  return (hHook!=NULL); z6KCv(zvB  
} :y'Ah#  
BOOL UnInit() v"y-0$M  
{ A!od9W6  
 if(nHookCount>1){ 52@C9Q,  
  nHookCount--; ]i|h(>QWP  
  return TRUE; cq,SP&T~  
 } +^` I?1\UF  
 BOOL unhooked = UnhookWindowsHookEx(hHook); QE^$=\l0  
 if(unhooked==TRUE){ 3lf=b~Zi)  
  nHookCount=0; Zd3S:),&  
  hHook=NULL; 2Z+Wu3#  
 } |6.l7u ?d  
 return unhooked; p2hB8zL  
} =mO vs  
GA$V0YQX  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `LrHKb aP  
{ bBiE  
 BOOL bAdded=FALSE; JgxtlYjl  
 for(int index=0;index<MAX_KEY;index++){ \Z?9{J  
  if(hCallWnd[index]==0){ R|6Cv3:  
   hCallWnd[index]=hWnd; M92dZ1+6  
   HotKey[index]=cKey; tZ]?^_Y1  
   HotKeyMask[index]=cMask; / kF)  
   bAdded=TRUE; 8V~k5#&Ow  
   KeyCount++; P@,XEQRd`  
   break; 4-l 8,@9  
  } .N,bIQnj  
 } 57'*w]4f  
 return bAdded; BGvre'67  
} FI)17i$  
[@&m4 7  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %vn|k[n D  
{ 'f#{{KA  
 BOOL bRemoved=FALSE; g?c xp +  
 for(int index=0;index<MAX_KEY;index++){ NN%*b yK  
  if(hCallWnd[index]==hWnd){ h){0rX@:&  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ @D]5civm_  
    hCallWnd[index]=NULL; ^ sOQi6pL  
    HotKey[index]=0; =J18eH!]  
    HotKeyMask[index]=0; E~DQ-z  
    bRemoved=TRUE; uu-PJTNZ  
    KeyCount--; -"R2  
    break; ?j'7l=94A  
   } ;!>rnxB?4  
  } J! AgBF N4  
 } I&fozO   
 return bRemoved; U&g@.,Y#  
} $POu\TO  
9>= ;FY  
void VerifyWindow() B~'vCuE  
{ j%Y#(Q>  
 for(int i=0;i<MAX_KEY;i++){ 034iK[ib"  
  if(hCallWnd!=NULL){ |T<_5Ik  
   if(!IsWindow(hCallWnd)){ c/:b.>W  
    hCallWnd=NULL; )Oq|amvC  
    HotKey=0; 7LfAaj  
    HotKeyMask=0; ;@0;pY  
    KeyCount--; `Syl:rU~y@  
   } Mc? Qx  
  } ^a/gBC82x  
 } ]MqMQLG0t  
} OsTc5K.U~  
(j%~u&+-  
BOOL CHookApp::InitInstance() R6 y#S&]x  
{ ^+*N%yr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 5 )A1\  
 hins=AfxGetInstanceHandle(); *1ilkmL%  
 InitHotkey(); >,v`EIg  
 return CWinApp::InitInstance(); eln)BW#  
} HSw;^E)1  
2% MC Yn  
int CHookApp::ExitInstance() im${3>26  
{ YC*"Thuu  
 VerifyWindow(); l z/8  
 UnInit(); =h-U  
 return CWinApp::ExitInstance(); t0( A4E  
} N&.H|5  
`:ArT}F  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $r^GE  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) O n8v//=&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "x#-sZ=  
#if _MSC_VER > 1000 O+nEXS\rQ  
#pragma once <!&[4-;fU  
#endif // _MSC_VER > 1000 HNb/-e ,"  
S%$ }(  
class CCaptureDlg : public CDialog ^8]NxV@l  
{ )~& CvJ  
 // Construction 9d>-MX'  
 public: ]N/=Dd+|  
  BOOL bTray; -5)H<dAQZ  
  BOOL bRegistered; %{7|1>8  
  BOOL RegisterHotkey(); >d(~# Z`  
  UCHAR cKey; EW}Bzh>b  
  UCHAR cMask; ##q2mm:a9P  
  void DeleteIcon(); q?Cnav`DY  
  void AddIcon(); gK+ 4C  
  UINT nCount; @Y?#Sl*  
  void SaveBmp(); e- ~N"  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor _H9 MwJ  
  // Dialog Data *o]L|Vu  
  //{{AFX_DATA(CCaptureDlg) > ;jZa  
  enum { IDD = IDD_CAPTURE_DIALOG }; 3(``#7  
  CComboBox m_Key; `b?R#:G  
  BOOL m_bControl; Av$]|b  
  BOOL m_bAlt; Vk` h2BV  
  BOOL m_bShift; mJ<=n?{Z  
  CString m_Path; Qu"8(Jk/  
  CString m_Number; S\^P ha q  
  //}}AFX_DATA |e=,oV"  
  // ClassWizard generated virtual function overrides ay4 %  
  //{{AFX_VIRTUAL(CCaptureDlg) \Yy$MLs  
 public: ['b}QW@Fx  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Z/G ev"p  
 protected: w3N[9w?1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0}<|7?  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %3s1z<;R[S  
  //}}AFX_VIRTUAL *}Xf!"I#]N  
  // Implementation :Oy%a'w   
 protected: f<-Jg  
  HICON m_hIcon; -TLlwxc^%  
  // Generated message map functions I"xo*}  
  //{{AFX_MSG(CCaptureDlg) BIH-"vTy  
  virtual BOOL OnInitDialog(); O6@j &*jS  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ,1hxw<sNR  
  afx_msg void OnPaint(); f@6QvkIa  
  afx_msg HCURSOR OnQueryDragIcon(); M|VyV (f  
  virtual void OnCancel(); 2Zm0qJ  
  afx_msg void OnAbout(); 87=&^.~`  
  afx_msg void OnBrowse(); 1}"++Z73P  
  afx_msg void OnChange(); a a<8,;  
 //}}AFX_MSG 0`Kj 25  
 DECLARE_MESSAGE_MAP() )z>|4@,  
}; P i=+/}  
#endif ;$HftG>B  
.28<tEf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file YP 6` L  
#include "stdafx.h" -<6\1J  
#include "Capture.h" } j<)L,  
#include "CaptureDlg.h" __uA}f Zp  
#include <windowsx.h> _,kj:R.  
#pragma comment(lib,"hook.lib") /pm]BC  
#ifdef _DEBUG CMe 06^U   
#define new DEBUG_NEW p}&#jE  
#undef THIS_FILE "<6G6?sz  
static char THIS_FILE[] = __FILE__; P)"noG_'i  
#endif C^s^D:   
#define IDM_SHELL WM_USER+1 {ba q+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i|c'Lbre`  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); U1Q:= yD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; rUTcpGH  
class CAboutDlg : public CDialog }pDqe;a{  
{ XWDL5K  
 public: Ltv]pH}YN  
  CAboutDlg(); \Bz_p'[G  
  // Dialog Data a@8v^G  
  //{{AFX_DATA(CAboutDlg) `Nv=B1  
  enum { IDD = IDD_ABOUTBOX }; w}L]X1#sF  
  //}}AFX_DATA Y2|#V#  
  // ClassWizard generated virtual function overrides 3s5z UT;  
  //{{AFX_VIRTUAL(CAboutDlg) RPwbTAl}  
 protected: C,wL0Yj[  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0;hqIJcE:\  
  //}}AFX_VIRTUAL >f^r^P  
  // Implementation Y1L[;)Hn  
 protected: Uq[>_"}  
  //{{AFX_MSG(CAboutDlg) 2uz W+D6J  
  //}}AFX_MSG f0A{W/0n  
  DECLARE_MESSAGE_MAP() H-WJp<_  
}; ksc;X$f&4  
&\#sI9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 1 Rq,a  
{ ]Gzm^6v  
 //{{AFX_DATA_INIT(CAboutDlg) <qtr   
 //}}AFX_DATA_INIT ZLc -RM  
} %}[i'rT>  
AmvEf  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) }\hVy(\c  
{ 6wPaJbRtaM  
 CDialog::DoDataExchange(pDX); EH$1fvE  
 //{{AFX_DATA_MAP(CAboutDlg) tW.9yII  
 //}}AFX_DATA_MAP 26e]`]!SU  
} S3F;(PDzy  
C](f>)Dz /  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) dFRsm0T  
 //{{AFX_MSG_MAP(CAboutDlg) 6RG)` bu  
 // No message handlers iyA'#bE-  
 //}}AFX_MSG_MAP VQ"hUX8  
END_MESSAGE_MAP() 8H;t_B  
.@2m07*1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) XQ#;Zs/l  
: CDialog(CCaptureDlg::IDD, pParent) P !AEf#1  
{ 3("_Z%  
 //{{AFX_DATA_INIT(CCaptureDlg) f6EZ( v  
  m_bControl = FALSE; \"qY"V  
  m_bAlt = FALSE; Olt `:;j-  
  m_bShift = FALSE; ) dn(G@5  
  m_Path = _T("c:\\"); T m,b,hi$  
  m_Number = _T("0 picture captured."); 2- &k^Gl!:  
  nCount=0; <x@}01 ~  
  bRegistered=FALSE; YO#M/%^j  
  bTray=FALSE; =w;F<M|Y  
 //}}AFX_DATA_INIT :Uz|3gq  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \O}E7 -  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); g=39C>  
} &?W0mW(  
2I%MAb&1@  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %;cddLQ\xY  
{ %.vQU @2A  
 CDialog::DoDataExchange(pDX); .nB0 h  
 //{{AFX_DATA_MAP(CCaptureDlg) dOa+(fMe  
  DDX_Control(pDX, IDC_KEY, m_Key); RtGWG*v4]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); u0 P|0\  
  DDX_Check(pDX, IDC_ALT, m_bAlt); bmJ5MF]_fG  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); _|iSF2f,X  
  DDX_Text(pDX, IDC_PATH, m_Path); zxJ]" N  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wi;Br[d  
 //}}AFX_DATA_MAP 6{x(.=  
} wE[]6\_x1  
]"J~:{, d  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) rk&IlAE  
//{{AFX_MSG_MAP(CCaptureDlg) N6>(;ugJ1-  
 ON_WM_SYSCOMMAND() wL;l Q&  
 ON_WM_PAINT() "*($cQ$v  
 ON_WM_QUERYDRAGICON() )n+Lo&C<  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) wy yWyf  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) QXL'^uO  
 ON_BN_CLICKED(ID_CHANGE, OnChange) h xSKG  
//}}AFX_MSG_MAP :S.9eFfa  
END_MESSAGE_MAP() (XeE2l2M  
LyZ.l*h%=m  
BOOL CCaptureDlg::OnInitDialog() Mx&&0#;r  
{ t'VV>;-RO=  
 CDialog::OnInitDialog(); YHkn2]^#A  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); n\QgOSr<  
 ASSERT(IDM_ABOUTBOX < 0xF000); |h-QP#]/  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Vc_'hz]Z  
 if (pSysMenu != NULL) T~--92[  
 { R(('/JC  
  CString strAboutMenu; >go,K{cK6  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 7"aN#;&  
  if (!strAboutMenu.IsEmpty()) 4\y/'`xm)6  
  { 2w59^"<,  
   pSysMenu->AppendMenu(MF_SEPARATOR); mlixIW2  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?a8^1:  
  } <d,b'<z s  
 } LwrUQ)  
 SetIcon(m_hIcon, TRUE); // Set big icon cFaaLUZk  
 SetIcon(m_hIcon, FALSE); // Set small icon Jzj1w}?H  
 m_Key.SetCurSel(0); lU @]@_<  
 RegisterHotkey(); Xp >7iX!:  
 CMenu* pMenu=GetSystemMenu(FALSE); u&`XB|~  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >CrA;\l  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <<@bl@9'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5Eg1Q YVt  
 return TRUE; // return TRUE unless you set the focus to a control M%Ji0v38  
} G]D+Sl4<7i  
[f)cL6AeF  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \!>3SKs(e  
{ IHe/xQ@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) u2[ iMd  
 { rQk<90Ar  
  CAboutDlg dlgAbout; K!:azP,bZ  
  dlgAbout.DoModal(); ozAS[B6  
 } '{E@*T /<.  
 else 8WtsKOno  
 { X<i^qoV  
  CDialog::OnSysCommand(nID, lParam); 7{e% u#  
 } 6`O.!|)  
} hakKs.U|[  
vu|n<  
void CCaptureDlg::OnPaint() ^c<ucv6.  
{ wLmhy,  
 if (IsIconic()) Qc gRAo+u  
 { *i]=f6G  
  CPaintDC dc(this); // device context for painting 1xD=ffM>8N  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); WfWN(:dF  
  // Center icon in client rectangle "^4_@ oo  
  int cxIcon = GetSystemMetrics(SM_CXICON); t\Nq R  
  int cyIcon = GetSystemMetrics(SM_CYICON); ?kWC}k{  
  CRect rect; 'h/CoTk@,  
  GetClientRect(&rect); a d.3A{  
  int x = (rect.Width() - cxIcon + 1) / 2; =x!2Ak/)  
  int y = (rect.Height() - cyIcon + 1) / 2; .uuO>:  
  // Draw the icon /s?r`'j[  
  dc.DrawIcon(x, y, m_hIcon); ?!9 )q.bW  
 } #1`-*.u  
 else }lh I\q  
 { FuVnk~gq  
  CDialog::OnPaint(); >SML"+>  
 } Zw*v  
} #.it]Nv{  
AB F"~=aL  
HCURSOR CCaptureDlg::OnQueryDragIcon() ko Z  
{ ,RJtm%w  
 return (HCURSOR) m_hIcon; /a^1_q-bX  
} fBalTk;G{U  
z8QAo\_I(  
void CCaptureDlg::OnCancel() WX=Jl<  
{ '$|[R98  
 if(bTray) *+-}P|S:  
  DeleteIcon(); X*&[u7No  
  CDialog::OnCancel(); E_k$W5  
} 'SCidN(n  
~Q?a|mV,  
void CCaptureDlg::OnAbout() WOQP$D9  
{ Pf|siC^;s~  
 CAboutDlg dlg; LJ*q1 ;<E  
 dlg.DoModal(); f#?fxUH~  
} h!&prYx  
{U!8|(  
void CCaptureDlg::OnBrowse() wT `a3Ymm  
{ Q7R~{5r>W  
 CString str; ZT,B(#m  
 BROWSEINFO bi; T? tG~  
 char name[MAX_PATH]; ])L A42|  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); '`eO\huf  
 bi.hwndOwner=GetSafeHwnd(); KMU4n-s"o  
 bi.pszDisplayName=name; 4"{ooy^Q  
 bi.lpszTitle="Select folder"; ?mWw@6G,  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; y9_K, g  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); jgbLN/_{  
 if(idl==NULL) F_;vO%}  
  return; Fb^:V4<T  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \<y`!"c  
 str.ReleaseBuffer(); '<rZm=48  
 m_Path=str; an|x$e7|?  
 if(str.GetAt(str.GetLength()-1)!='\\') wW#}:59}  
  m_Path+="\\"; +w.JpbQ&  
 UpdateData(FALSE); >c9a0A  
} nx8a$vI-TY  
PIH*Rw*GKZ  
void CCaptureDlg::SaveBmp() |55N?=8  
{ /G5d|P  
 CDC dc; |_`E1Y}}  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); T-5nB>)  
 CBitmap bm; h&`e) a>+  
 int Width=GetSystemMetrics(SM_CXSCREEN); UG)8D5  
 int Height=GetSystemMetrics(SM_CYSCREEN); v=_6XF  
 bm.CreateCompatibleBitmap(&dc,Width,Height); &K/ya7  
 CDC tdc; h&Efg   
 tdc.CreateCompatibleDC(&dc); mH Ic f{RG  
 CBitmap*pOld=tdc.SelectObject(&bm); dZi(&s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); '[ C.|)"  
 tdc.SelectObject(pOld); H2um|6>  
 BITMAP btm; F{eU";D  
 bm.GetBitmap(&btm); G`\f  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Xb{ [c+.  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (xVsDAp=@  
 BITMAPINFOHEADER bih; L5#P[cHzz  
 bih.biBitCount=btm.bmBitsPixel; E_8\f_%wK  
 bih.biClrImportant=0; blTo5NLX  
 bih.biClrUsed=0; 1E73i_L  
 bih.biCompression=0; 9[m6Li  
 bih.biHeight=btm.bmHeight; mf}O-Igte  
 bih.biPlanes=1; 8"dv_`ym  
 bih.biSize=sizeof(BITMAPINFOHEADER); Q\cjPc0y  
 bih.biSizeImage=size; |4T !&[r  
 bih.biWidth=btm.bmWidth; E-I-0h2  
 bih.biXPelsPerMeter=0; 0%m)@ukb  
 bih.biYPelsPerMeter=0; $% 1vW=d  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <Wp QbQM  
 static int filecount=0; ow_djv:,  
 CString name; Bx/L<J@  
 name.Format("pict%04d.bmp",filecount++); {@tv>!WW  
 name=m_Path+name; 4?-.Z UT-1  
 BITMAPFILEHEADER bfh; qEpi]=|  
 bfh.bfReserved1=bfh.bfReserved2=0; iMs5zf <M  
 bfh.bfType=((WORD)('M'<< 8)|'B'); hRty [  
 bfh.bfSize=54+size; WHjUR0NZ  
 bfh.bfOffBits=54; R}lsnX<  
 CFile bf; [P 06lIO  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ w9, iq@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 2 !At2P2  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); VUhbD  
  bf.WriteHuge(lpData,size); SQqD:{#g"  
  bf.Close(); uO=aaKG  
  nCount++; +"8,Mh  
 } \ gLHi~  
 GlobalFreePtr(lpData); |b*? qf  
 if(nCount==1) ^4,a8`  
  m_Number.Format("%d picture captured.",nCount); )hk   
 else tI7:5Cm  
  m_Number.Format("%d pictures captured.",nCount); G3rj`Sg^c  
  UpdateData(FALSE); JaK}|  
} ,t`Kv1  
TZ2=O<Kj  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) :'*DPB-  
{ 7vABq(  
 if(pMsg -> message == WM_KEYDOWN) ( YQWbOk  
 { *,Za6.=  
  if(pMsg -> wParam == VK_ESCAPE) {%IExPJ  
   return TRUE; ,:??P1  
  if(pMsg -> wParam == VK_RETURN)  w~ [b*$  
   return TRUE; f|R"u W +  
 } u%/goxA  
 return CDialog::PreTranslateMessage(pMsg); #*TEq  
} [o.B  
3bDQk :L  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Fd#m<"  
{ oI.G-ChP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l'\pk<V  
  SaveBmp(); lKlU-4  
  return FALSE; }S3qBQTYL  
} Er{#ziN+  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ \[jq4`\$  
 CMenu pop; D5:{fWVsV/  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); TpHfS]W-P  
 CMenu*pMenu=pop.GetSubMenu(0); s%2v3eb  
 pMenu->SetDefaultItem(ID_EXITICON); L3n_ 5|  
 CPoint pt; *&d<yJM`b  
 GetCursorPos(&pt); (ZY@$''  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %/YcL6o(  
 if(id==ID_EXITICON) j%y$_9a7  
  DeleteIcon(); 6$ Gep  
 else if(id==ID_EXIT) }J7zTj~{  
  OnCancel(); <x&%~6j  
 return FALSE; Tp0bS  
} 5cEcTJL[C  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Y_]De3:V0B  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ({NAMc*  
 AddIcon(); k iRa+w:  
 return res; CYKr\DA  
} jiYmb8Q4D  
ZKXo-~=>  
void CCaptureDlg::AddIcon() fgBM_c&9T  
{ 1&P<  
 NOTIFYICONDATA data; cKn`/\.H  
 data.cbSize=sizeof(NOTIFYICONDATA); me'd6!O9-  
 CString tip; cZ<A0  
 tip.LoadString(IDS_ICONTIP); 6<'21  
 data.hIcon=GetIcon(0); 8P"_#M?!  
 data.hWnd=GetSafeHwnd(); h68]=KyK  
 strcpy(data.szTip,tip); .58qL-iC  
 data.uCallbackMessage=IDM_SHELL; 4WE6fJ2X  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; m\ddp_l  
 data.uID=98; a\%xB >LX  
 Shell_NotifyIcon(NIM_ADD,&data); |gsE2vV  
 ShowWindow(SW_HIDE); [p2H=  
 bTray=TRUE; MNg^]tpf  
} 8Th` ]tI  
bO&7-Z~:=  
void CCaptureDlg::DeleteIcon() ua OKv.%  
{ H<QT3RF2  
 NOTIFYICONDATA data; J7v|vj I  
 data.cbSize=sizeof(NOTIFYICONDATA); MSV2ip3  
 data.hWnd=GetSafeHwnd(); A.D{.a  
 data.uID=98; gd0Vp Xf'  
 Shell_NotifyIcon(NIM_DELETE,&data); |,aG%MTL  
 ShowWindow(SW_SHOW); .cR -V`  
 SetForegroundWindow(); EaWS. eK  
 ShowWindow(SW_SHOWNORMAL); jZ%TJ0(H  
 bTray=FALSE; !o>H1#2l  
} /[9t`  
e5OsI Vtjr  
void CCaptureDlg::OnChange() sg8/#_S1i  
{ M{$j  
 RegisterHotkey(); oX4q`rt  
} ~`D|IWMDq  
Z(ZiFPx2Z  
BOOL CCaptureDlg::RegisterHotkey() HXoX  
{ b]7GmRekl  
 UpdateData(); /RyR>G!  
 UCHAR mask=0; ?h0X,fl3  
 UCHAR key=0; !=y]Sv~h  
 if(m_bControl) rLU/W<F8  
  mask|=4; A"aV'~>  
 if(m_bAlt) Dk='+\  
  mask|=2; Q0\0f  
 if(m_bShift) jn: NYJv  
  mask|=1; @G:V  
  key=Key_Table[m_Key.GetCurSel()]; q|%(3,)ig  
 if(bRegistered){ 'oN\hy($,h  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2>\v*adG  
  bRegistered=FALSE; >j{z>  
 } 6&!&\  
 cMask=mask; &*s0\ 8  
 cKey=key; !bC+TYsU  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); :aG#~-Q  
 return bRegistered; 5'Q|EIL  
} .>(Q)"v  
1RKW2RCaW_  
  四、小结 :0/q5_t  
siTX_`0  
  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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