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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: j@ehcK9|  
  {hP_"nN#  
  一、实现方法 vOF"p4 ^3  
V?yTJJ21X  
  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: cPx] :sC  
s|cL mL[  
#pragma data_seg("shareddata") 84X/=l-c=  
HHOOK hHook =NULL; //钩子句柄 By&ibN),  
UINT nHookCount =0; //挂接的程序数目 w# iezo. 0  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 J>o%6D  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :" ta#g'  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %I`%N2ss  
static int KeyCount =0; ?QbxC,& i  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 AlVB hR`  
#pragma data_seg() @N(*1,s2  
NQ9/,M  
  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。 cN?}s0  
M15jwR!:M  
  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: ^9jrI  
3RbPc8($Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR neLQ>WT L  
cKey,UCHAR cMask) ^KlW"2:  
{ yJ0q)x sS  
 BOOL bAdded=FALSE; J*%XtRio  
 for(int index=0;index<MAX_KEY;index++){ 8.Z9 i  
  if(hCallWnd[index]==0){ WP}NHz4H  
   hCallWnd[index]=hWnd; $2><4~T;|A  
   HotKey[index]=cKey; j0X Jf<  
   HotKeyMask[index]=cMask; >>>&{>}!  
   bAdded=TRUE; bF"1M#u:  
   KeyCount++; &"R`:`XF  
   break; G\PFh&  
  } ]YF_c,Q  
 } y\C_HCU H  
 return bAdded; $sfDtnRy  
} lx)Bj6  
//删除热键 Q 1:7 9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F5+)=P#  
{ (q 0wV3Qv  
 BOOL bRemoved=FALSE; rBLcj;,  
 for(int index=0;index<MAX_KEY;index++){ 4.t72*ML  
  if(hCallWnd[index]==hWnd){ R=co2 5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ LBw$K0  
    hCallWnd[index]=NULL; }w|a^=HAp  
    HotKey[index]=0; DwNEqHi  
    HotKeyMask[index]=0; S.! n35  
    bRemoved=TRUE; W }"n*  
    KeyCount--; (+iOy/5#u  
    break; dEvjB"x  
   } p7Xe[94d^  
  } ==ZL0 ][  
 } ^+MG"|)u~  
 return bRemoved; %b1NlzB+  
} &BZjQK  
.@kjC4m  
0rA&Q0  
  DLL中的钩子函数如下: zHg1K,t:  
"NM SLqO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9sId2py]W  
{ DKG99biJN  
 BOOL bProcessed=FALSE; rG t/ /6  
 if(HC_ACTION==nCode) JNL9t0 x  
 { 4~DW7 (  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H[e=^JuD  
   switch(wParam) `^G?+p2E  
   {  >OotgJnhC  
    case VK_MENU: Z'cL"n\9R]  
     MaskBits&=~ALTBIT; nX>HRdC  
     break; u]$e@Vw.  
    case VK_CONTROL: !\hUjM+(}  
     MaskBits&=~CTRLBIT; vFx0B?  
     break; 0)0,&@])7  
    case VK_SHIFT: $:u5XJx  
     MaskBits&=~SHIFTBIT; <fm<UO,%  
     break; D\LXjEm e.  
    default: //judge the key and send message P:QSr8K  
     break; ^!j,d_)b!  
   } ui!MQk+D9  
   for(int index=0;index<MAX_KEY;index++){ `%<^$Ng;  
    if(hCallWnd[index]==NULL) ~6!TMVr  
     continue; _Z0O]>KH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #[ TOe  
    { ]7/6u.G7R  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8w\ZY>d   
     bProcessed=TRUE; *f*o ,~8V1  
    } \-nbV#{  
   } )d =8)9B  
  } @\}w8  
  else if((lParam&0xc000ffff)==1){ //有键按下 T:|PSJc0  
   switch(wParam) <ZXK}5SZ#  
   { TJ`Jqnh  
    case VK_MENU: XnNU-UCX  
     MaskBits|=ALTBIT; ":Uv u[-  
     break; L >HyBB  
    case VK_CONTROL: k%TjRf{p  
     MaskBits|=CTRLBIT; ^- H  
     break; YacLYo#  
    case VK_SHIFT: 1b LY1  
     MaskBits|=SHIFTBIT; U:+wt}-T"  
     break; Y$K[@_dv=  
    default: //judge the key and send message SLi?E  
     break; Pu`;B  
   } 3j} @}2D  
   for(int index=0;index<MAX_KEY;index++){ g7g^iLU  
    if(hCallWnd[index]==NULL) -8%[ 7Z]  
     continue; S @tpd'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) --BS/L-  
    { C/{%f,rU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); %]\IC(q  
     bProcessed=TRUE; IM8lA  
    } RS9mAeX4h  
   } %7 [ Z/U=  
  } h$U(1B  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Cj3C%W  
   for(int index=0;index<MAX_KEY;index++){ >sl#2,br  
    if(hCallWnd[index]==NULL) -+,3aK<[  
     continue; \ QE?.Fx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) :@c\a99Kx  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); o>?#$~XNv  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 k=``Avp?  
   } Z+M* z;  
  } {<#~Ya-  
 } >[&Zs3>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); oJln"-M1nx  
} dHJ#xmE!pP  
m6iQB\ \  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: =ec"G2$?"  
d7i 0'R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W,-fnJk  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); kr{eC/Q"  
$*N)\>~X  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: M9dOLM.  
]O 8hkGa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Ce-D^9kC  
{ E@N& Y1t  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ]J)3y+;P  
 { P8\bi"iiN  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @/ G$ C9<  
  SaveBmp(); )4CF*>*6V  
  return FALSE; TD6MP9L  
 } si,W.9rU  
 …… //其它处理及默认处理 SO8b~N  
} m{{ 8#@g  
 bMDj+i  
Xm I63W*  
  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。 yf@DaIG  
/+g)J0u  
  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。 aA3KJa  
A{,ZfX;SPO  
  二、编程步骤 ~3r}6,%  
au~}s |#  
  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"; ~uRL+<.c  
9f7T.}HM  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \$[; d:9j  
o5`LLVif5y  
  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; = k7}[!T  
qEy]Rc%  
  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; ;rjd?r  
]^c]*O[8  
  5、 添加代码,编译运行程序。 'pQ\BH  
B kh1VAT  
三、程序代码 Yfjp:hg/!  
rQM$lJ[x  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL o{I]c#W  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) HI%#S&d  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ VyWPg7}e  
#if _MSC_VER > 1000 dSq3V#Q  
#pragma once lVR a{._m  
#endif // _MSC_VER > 1000 Kh,zp{  
#ifndef __AFXWIN_H__ 1?hx/02  
#error include 'stdafx.h' before including this file for PCH -er8(snDQ  
#endif Yj/[I\I"m  
#include "resource.h" // main symbols ,p7W4;?4  
class CHookApp : public CWinApp 4y|%Oj  
{ hQPNxpe  
 public: Ks_B%d  
  CHookApp(); +204.Yj?D  
  // Overrides MF]EX  
  // ClassWizard generated virtual function overrides V<W$ h`  
  //{{AFX_VIRTUAL(CHookApp) nr>Os@\BU  
 public: -FrNk>  
  virtual BOOL InitInstance(); 3,[#%}1(S  
  virtual int ExitInstance(); KV {J>J1  
  //}}AFX_VIRTUAL l0GsY.~,  
  //{{AFX_MSG(CHookApp) :$5$H  
  // NOTE - the ClassWizard will add and remove member functions here. =&YhA}l\O  
  // DO NOT EDIT what you see in these blocks of generated code ! .sE5QRVc  
  //}}AFX_MSG WO<a^g {  
  DECLARE_MESSAGE_MAP() /hksESiU  
}; Z(0sMOaX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Pt^SlX^MM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zEN3N n.8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w(-h!d51+  
BOOL InitHotkey(); 1Bhd-  
BOOL UnInit(); q[Ed6FM$~  
#endif c3]X#Qa#m$  
7ElU5I<S  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2ms@CQy(00  
#include "stdafx.h" zc#$hIi  
#include "hook.h" DSX.84  
#include <windowsx.h> 6l,oL'$}P1  
#ifdef _DEBUG %UnL,V9)  
#define new DEBUG_NEW N_^s;Qj  
#undef THIS_FILE n)xLEx,  
static char THIS_FILE[] = __FILE__; p81Vt   
#endif 8{ooLdpX7  
#define MAX_KEY 100 6(as.U>K  
#define CTRLBIT 0x04 ?Ja&LNI9S  
#define ALTBIT 0x02 E Zh.*u@^r  
#define SHIFTBIT 0x01 #BLmT-cl  
#pragma data_seg("shareddata") `+?g96   
HHOOK hHook =NULL; G}8Zkz@+  
UINT nHookCount =0; ~P;KO40K  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey P<s 0f:".  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT zvAUF8'_  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey SG@-b(  
static int KeyCount =0; 2T >K!jS  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ~+OAAkJ9  
#pragma data_seg() G>f2E49BXt  
HINSTANCE hins; XjINRC8^4  
void VerifyWindow(); _Cnl|'  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) b`yb{& ,?  
//{{AFX_MSG_MAP(CHookApp) T2/lvvG  
// NOTE - the ClassWizard will add and remove mapping macros here. + 2?=W1`  
// DO NOT EDIT what you see in these blocks of generated code! PbpnjvVrM  
//}}AFX_MSG_MAP ^Pp2T   
END_MESSAGE_MAP() S%{^@L+V  
7 S 6@[-E  
CHookApp::CHookApp() <A+n[h  
{ W3aFao>!OZ  
 // TODO: add construction code here, s.qo/o\b  
 // Place all significant initialization in InitInstance W _JGJV.^f  
} _ 0g\g~[  
Pua| Z x  
CHookApp theApp; x_VD9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?CU6RC n  
{ Ww)p&don  
 BOOL bProcessed=FALSE; yDe6f(D  
 if(HC_ACTION==nCode) pB0p?D)n  
 { O~~WP*N  
  if((lParam&0xc0000000)==0xc0000000){// Key up kACgP!~/1  
   switch(wParam) sjIUW$  
   { .,+TpP kc  
    case VK_MENU: &'KJh+jJ  
     MaskBits&=~ALTBIT; 4M,Q{G|e  
     break; (u:^4,Z  
    case VK_CONTROL: 'ugc=-0pd  
     MaskBits&=~CTRLBIT; 0tb%h[%,M  
     break; {@YY8SKb9  
    case VK_SHIFT: 'h.:-1# L  
     MaskBits&=~SHIFTBIT; m(DJ6CSa  
     break; B3C%**~:e  
    default: //judge the key and send message YkuFt>U9,  
     break; 7G]v(ay  
   } m]Gxep0%  
   for(int index=0;index<MAX_KEY;index++){ ewrs D'?  
    if(hCallWnd[index]==NULL) x,81#=m^h  
     continue; HY!R|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ky#5G-X  
    { R!Lh ~~@{(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); c+A$ [  
     bProcessed=TRUE; 4-voR5Fd  
    } ]o+5$L,5b  
   } G~ mLc  
  } %<]4]h  
  else if((lParam&0xc000ffff)==1){ //Key down ~H4wsa39  
   switch(wParam) PXrv2q[5?  
   { /9@[gv A  
    case VK_MENU: {i#z <ttu  
     MaskBits|=ALTBIT; E>I\m!ue  
     break; )Bw}T  
    case VK_CONTROL: rZ#ZY  
     MaskBits|=CTRLBIT; HzQ Y\Y6  
     break; 50jZu'z:  
    case VK_SHIFT: )Gm,%[?2C  
     MaskBits|=SHIFTBIT; $~c wB  
     break;  Qo$j'|lD  
    default: //judge the key and send message BL[N  
     break; CFTw=b@  
   } oT0TbZu%  
   for(int index=0;index<MAX_KEY;index++) +{h.nqdAE  
   { SPN5H;{[]K  
    if(hCallWnd[index]==NULL) kJ[r.)HU  
     continue; @ Cd#\D|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) }5]2tH${  
    { uEui{_2$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); AC&)FY  
     bProcessed=TRUE; mxEn iy  
    } fK{m7?V  
   } Em ;2fh  
  } )eD9H*mq  
  if(!bProcessed){ i9koh3R\  
   for(int index=0;index<MAX_KEY;index++){ 'B\7P*L"p  
    if(hCallWnd[index]==NULL) f Hd|tl  
     continue; vN9R. R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) cMK}BHOC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); U-U"RC>  
   } /P%OXn$i/  
  } O;lGh1.  
 } WRov7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ISHzlEY  
} fW=vN0Z  
c]%~X&Tg`  
BOOL InitHotkey() F87/p  
{ urhOvC$a  
 if(hHook!=NULL){ A@<a')#>)  
  nHookCount++; 8}K^o>J&K  
  return TRUE; CuT50N;tk  
 } 38#Zlc f  
 else {&ykpu090  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); \@B 'f  
  if(hHook!=NULL) G_]zymXQ  
   nHookCount++; _)kTlX:,  
  return (hHook!=NULL); U!i1~)s  
} r#'ug^^k$X  
BOOL UnInit() IhjZ{oV/@  
{ XY^]nm-{I  
 if(nHookCount>1){  35%\"Y?  
  nHookCount--; %E2b{Y;  
  return TRUE; ~JQ6V?fucD  
 } ^D8~s;?  
 BOOL unhooked = UnhookWindowsHookEx(hHook); aqEmF  
 if(unhooked==TRUE){ 2h:{6Gq8  
  nHookCount=0; /b7]NC%  
  hHook=NULL; 92x)Pc^D  
 } s[bQO1g;*  
 return unhooked; \IaUsx"#o{  
} +L|x^ B3  
b/"gUYo  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >@)p*y.K  
{ ryNe=9p  
 BOOL bAdded=FALSE; 5=&ME(fmV  
 for(int index=0;index<MAX_KEY;index++){ c!ieN9^+  
  if(hCallWnd[index]==0){ |Kb m74Z%  
   hCallWnd[index]=hWnd; FBxg^g%PB@  
   HotKey[index]=cKey; MfZamu5+F  
   HotKeyMask[index]=cMask; bae;2| w  
   bAdded=TRUE; Y'<wE2ZL)  
   KeyCount++; 3Fw7q"  
   break; :cvT/xhO  
  } G=/^]E  
 } !oa/\p  
 return bAdded; Rt>mAU$}  
} goe %'k,  
$5:I~ -mx  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) FsLd&$?T&  
{ GL%)s?   
 BOOL bRemoved=FALSE; h S)lQl:^  
 for(int index=0;index<MAX_KEY;index++){ 2]]}Xvx4#  
  if(hCallWnd[index]==hWnd){ h~lps?.#b  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ot0g@q[3  
    hCallWnd[index]=NULL; GkpYf~\Q  
    HotKey[index]=0; n^|SN9 _r  
    HotKeyMask[index]=0; l >~Rzw  
    bRemoved=TRUE; =o4gW`\z  
    KeyCount--; \%&):OD1  
    break; D"gv:RojD  
   } m Uy>w  
  } OS-k_l L  
 } f0879(,i  
 return bRemoved; U(gYx@   
} (mplo|>  
RzU9]e  
void VerifyWindow() : { iK 5  
{ zZ,"HY=jN  
 for(int i=0;i<MAX_KEY;i++){ ++n_$Qug  
  if(hCallWnd!=NULL){ 0avtfQ +f  
   if(!IsWindow(hCallWnd)){ w75Ro6y  
    hCallWnd=NULL; 10Q!-K),p  
    HotKey=0; uFA}w:Fm  
    HotKeyMask=0; >0_{80bdO  
    KeyCount--; Oyb0t|do+  
   } +|Izjx]ZV  
  } `A9fanh  
 } *{,}pK2*  
} X .sOZb?$  
g&{CEfw&  
BOOL CHookApp::InitInstance() m>|7&l_  
{ k[)/,1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AZf69z  
 hins=AfxGetInstanceHandle(); r KYQ 8T  
 InitHotkey(); &@FufpPw/  
 return CWinApp::InitInstance(); T% GR{mp  
} <Sr:pm  
B}nT>Ub  
int CHookApp::ExitInstance() &dPUd ~&EL  
{ Yxy!&hPLv:  
 VerifyWindow(); 9oIfSr,y  
 UnInit(); Sk:x.oOZ  
 return CWinApp::ExitInstance(); bI^F (  
} -Kw7! =_ g  
Kn1T2WSAg  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file `6RccEm  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \r9E6LL X'  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ #l h' !  
#if _MSC_VER > 1000 M N (o  
#pragma once 6VS_L@  
#endif // _MSC_VER > 1000 LcT;7yv  
F|cli <  
class CCaptureDlg : public CDialog 1:Ff#Eq,s  
{ 5{WvV%  
 // Construction EI)2 c.A  
 public: 2'@D0L  
  BOOL bTray; ' 9%iHx-<  
  BOOL bRegistered; Q~/=p>=uu  
  BOOL RegisterHotkey(); 7nB X@Uo  
  UCHAR cKey; -p%cw0*Y]C  
  UCHAR cMask; =v0w\( ?N  
  void DeleteIcon(); _Fn`G .r<  
  void AddIcon(); ZvLI~ul(zT  
  UINT nCount; 'v@*xF/L6a  
  void SaveBmp(); YI;MS:Qj  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 6Eus_aP  
  // Dialog Data =f23lA  
  //{{AFX_DATA(CCaptureDlg) JNT|h zV  
  enum { IDD = IDD_CAPTURE_DIALOG }; ;.<HpDfG_  
  CComboBox m_Key; uH(M@7"6_!  
  BOOL m_bControl; |Qb@.  
  BOOL m_bAlt; ,B /b>i  
  BOOL m_bShift; 8Q"1I7U  
  CString m_Path; acgx')!c  
  CString m_Number; dWu;F^  
  //}}AFX_DATA Lxv6\3I+  
  // ClassWizard generated virtual function overrides {;m|\652B  
  //{{AFX_VIRTUAL(CCaptureDlg) q: X^V$`  
 public: 3[m2F O,Z  
  virtual BOOL PreTranslateMessage(MSG* pMsg); =GW[UnO  
 protected: m=Gb<)Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;Wa&Dg/5`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Jl6lZd(Np  
  //}}AFX_VIRTUAL dt>9mF q  
  // Implementation \ .+:yV<$  
 protected: ;)SWwhQ  
  HICON m_hIcon; Bj"fUI!dK  
  // Generated message map functions m. \JO  
  //{{AFX_MSG(CCaptureDlg) &;`E3$>  
  virtual BOOL OnInitDialog(); u.*}'C>^^v  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ZD7qw*3+  
  afx_msg void OnPaint(); ~3&hvm[IQ  
  afx_msg HCURSOR OnQueryDragIcon(); dPxJ`8  
  virtual void OnCancel(); \KS.A 4  
  afx_msg void OnAbout(); qq_ZkU@xg  
  afx_msg void OnBrowse(); O4:_c-V2  
  afx_msg void OnChange(); uRYq.`v,  
 //}}AFX_MSG 5iI(A'R[7  
 DECLARE_MESSAGE_MAP() ~w9`l8/0  
}; zD<8.AIGC  
#endif gIIF17|Z  
7TU xdI  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^t*Ba>A  
#include "stdafx.h" 1*'gaa&y  
#include "Capture.h" 9g'6zB  
#include "CaptureDlg.h" (i?9/8I  
#include <windowsx.h> 9Zmq7a E  
#pragma comment(lib,"hook.lib") |7Ab_  
#ifdef _DEBUG 9]lyV  
#define new DEBUG_NEW A_e5Vb ,u.  
#undef THIS_FILE EcSu[b  
static char THIS_FILE[] = __FILE__; 3xKgj5M  
#endif [0]J 2  
#define IDM_SHELL WM_USER+1 'm"Ez'sS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); .TDg`O24c,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); YXh!+}  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Zz]/4 4t  
class CAboutDlg : public CDialog ]0SqLe  
{ g[ uf e<  
 public: O(9*VoD  
  CAboutDlg(); \ rg;xZa5  
  // Dialog Data ?<5KLvGv  
  //{{AFX_DATA(CAboutDlg) QAMcI:5  
  enum { IDD = IDD_ABOUTBOX }; 1_]%,  
  //}}AFX_DATA TJ>1?W\Z  
  // ClassWizard generated virtual function overrides baL<|& c  
  //{{AFX_VIRTUAL(CAboutDlg) =P_ *.SgR  
 protected: Sfp-ns32%A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support y+V>,W)r7  
  //}}AFX_VIRTUAL cM4{ e^  
  // Implementation rY&#g%B6Fp  
 protected: (ip3{d{CT]  
  //{{AFX_MSG(CAboutDlg) pp{GaCi  
  //}}AFX_MSG e**'[3Y  
  DECLARE_MESSAGE_MAP() *65~qAd  
}; ( z F_<  
\hb$v  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ts|;5ya5m  
{ [-81s!#mkw  
 //{{AFX_DATA_INIT(CAboutDlg) F1L[C4'  
 //}}AFX_DATA_INIT &&m1_K  
} )K`tnb.Pf  
Pj_DI)^  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f^F"e'1  
{ !R#PJH/TM  
 CDialog::DoDataExchange(pDX); sIl&\g<b  
 //{{AFX_DATA_MAP(CAboutDlg) h(3-/4  
 //}}AFX_DATA_MAP .I$+ E  
} lz1cLl m  
 -)KNsW  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) opu)9]`z  
 //{{AFX_MSG_MAP(CAboutDlg) 1jAuW~  
 // No message handlers eNM"e-  
 //}}AFX_MSG_MAP =UWW(^M#[:  
END_MESSAGE_MAP() {sj{3Iu  
aGws?<1$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 'z)cieFKP  
: CDialog(CCaptureDlg::IDD, pParent) &OEBAtc/  
{ G `B=:s]  
 //{{AFX_DATA_INIT(CCaptureDlg) $2blF)uYE  
  m_bControl = FALSE; u6IM~kk>5  
  m_bAlt = FALSE; =NnG[#n%  
  m_bShift = FALSE; sJl>evw  
  m_Path = _T("c:\\"); Z:V<P,N  
  m_Number = _T("0 picture captured."); $ 9E"{6;@  
  nCount=0; hx/A215L  
  bRegistered=FALSE; b^()[4M;  
  bTray=FALSE; {a9.0N:4  
 //}}AFX_DATA_INIT ~ahu{A4Bw  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 CyB4apJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); <1:I[b  
} 4!-R&<TLve  
Z@$'fX?~9  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `Hv"^o  
{ i }Zz[b  
 CDialog::DoDataExchange(pDX); !YlEXaS  
 //{{AFX_DATA_MAP(CCaptureDlg) x")Bmw$  
  DDX_Control(pDX, IDC_KEY, m_Key); /OMgj7olD  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); e eyZ $n  
  DDX_Check(pDX, IDC_ALT, m_bAlt); A{T> Aac  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); E8<,j})*  
  DDX_Text(pDX, IDC_PATH, m_Path); H`Zg-j`  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *"6A>:rQs  
 //}}AFX_DATA_MAP =4&"fZ"v  
} kE!ky\E  
+%~me?  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) sEZ2DnDI  
//{{AFX_MSG_MAP(CCaptureDlg) |?MD>Pez  
 ON_WM_SYSCOMMAND() A@4{-e\  
 ON_WM_PAINT() De>,i%`Q,D  
 ON_WM_QUERYDRAGICON() -lq`EB +  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0m\( @2E  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) HzuG- V  
 ON_BN_CLICKED(ID_CHANGE, OnChange) m`Z.xIA7;  
//}}AFX_MSG_MAP ycvgF6Me<  
END_MESSAGE_MAP() BGOS(  
pL>Yx>  
BOOL CCaptureDlg::OnInitDialog() z8)&ekG  
{ 8= 82x  
 CDialog::OnInitDialog(); =*>.z@WQ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); <'A-9y]-v  
 ASSERT(IDM_ABOUTBOX < 0xF000); +Mn(s36f2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); D`.\c#;cN  
 if (pSysMenu != NULL) qw)Ou]L=  
 { $"}*#<Z  
  CString strAboutMenu; IF<T{/MA  
  strAboutMenu.LoadString(IDS_ABOUTBOX); |%3>i"Y@AK  
  if (!strAboutMenu.IsEmpty()) 4$ah~E>,t  
  { YdB/s1|G  
   pSysMenu->AppendMenu(MF_SEPARATOR); MI.OOoP3a  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); U_E t  
  } i3Xo6!Q  
 } AP4s_X+=  
 SetIcon(m_hIcon, TRUE); // Set big icon :`<MlX  
 SetIcon(m_hIcon, FALSE); // Set small icon <A`SC;k\u  
 m_Key.SetCurSel(0); km`";gUp>  
 RegisterHotkey(); Z-" NLwt[  
 CMenu* pMenu=GetSystemMenu(FALSE); iuM ,a F  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); qNMYZ0,  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $?LegX  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); [[Nn~7  
 return TRUE; // return TRUE unless you set the focus to a control tn(6T^u  
} kK0zb{  
9'|_1Q.b^  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) /;u=#qu(E-  
{ ') 2LP;(  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) N f}ZG  
 { P86wRq  
  CAboutDlg dlgAbout; vAOThj)  
  dlgAbout.DoModal(); Wkr31Du\K  
 } p6Ia)!xOGF  
 else BE0Xg  
 { &0d5".|s  
  CDialog::OnSysCommand(nID, lParam); T)e Uo  
 } E% Ko[G  
} fj9&J[  
}We-sZ/w7r  
void CCaptureDlg::OnPaint() "tDB[?  
{ r $YEq5  
 if (IsIconic()) )2u_c=  
 { R[m+s=+  
  CPaintDC dc(this); // device context for painting a\B?J  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); H6KBXMYO  
  // Center icon in client rectangle %.fwNS  
  int cxIcon = GetSystemMetrics(SM_CXICON); >rYMOC~  
  int cyIcon = GetSystemMetrics(SM_CYICON); OL@$RTh  
  CRect rect; li#ep?5h^  
  GetClientRect(&rect); )U8=-_m  
  int x = (rect.Width() - cxIcon + 1) / 2; ZK<c(,oZ^  
  int y = (rect.Height() - cyIcon + 1) / 2; Z]Cd>u  
  // Draw the icon IL?"g{w  
  dc.DrawIcon(x, y, m_hIcon); (I{+ %  
 } bcAk$tA2  
 else ?d k)2  
 { |ss4pN0X  
  CDialog::OnPaint(); [EQTrr( D  
 } rV*Ri~Vx  
} 9pk-#/ag  
s>{\^T7y  
HCURSOR CCaptureDlg::OnQueryDragIcon() Oz "_KMz  
{ R[QBFL<  
 return (HCURSOR) m_hIcon; )L_@l5l  
} OhM_{]*  
tvUCd}  
void CCaptureDlg::OnCancel() {T0Au{88H  
{ lj+&3<E  
 if(bTray) &F*eo`o}6  
  DeleteIcon(); (SA^> r  
  CDialog::OnCancel(); ],'"iVh  
} dMI G2log  
~Ds3 -#mMy  
void CCaptureDlg::OnAbout() %P C[-(Q  
{ 3aJYl3:0B  
 CAboutDlg dlg; }5Km \OI  
 dlg.DoModal(); $9W,1wg  
} iRV=I,  
QQ %W3D @  
void CCaptureDlg::OnBrowse() crgVedx~}  
{ UH((d*HX4  
 CString str; {GGP8  
 BROWSEINFO bi; Q4g69IE  
 char name[MAX_PATH]; Y+0GJuBf  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); hANe$10=H  
 bi.hwndOwner=GetSafeHwnd(); vVjk9_Ul  
 bi.pszDisplayName=name; SXNde@% {  
 bi.lpszTitle="Select folder"; 74c5\UxA  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *-E'$  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); @S&QxE^  
 if(idl==NULL) &WS'Me  
  return; ;RMevVw|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "cvhx/\1#  
 str.ReleaseBuffer(); J2$,'(!(  
 m_Path=str; 4 lwoTGVZj  
 if(str.GetAt(str.GetLength()-1)!='\\') 0Ld"df*  
  m_Path+="\\"; j&q%@%Gm  
 UpdateData(FALSE); =i},$"Bf*%  
} | _nBiHjNn  
TrQUhmS/!  
void CCaptureDlg::SaveBmp() ~CHVU3  
{ *De'4r 2  
 CDC dc; BP1<:T'.q`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &@w0c>Y  
 CBitmap bm; 9vCCE[9  
 int Width=GetSystemMetrics(SM_CXSCREEN); _KZ TY`/*  
 int Height=GetSystemMetrics(SM_CYSCREEN); uSH_=^yTQ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (N9g6V  
 CDC tdc; S.?DR3XLc  
 tdc.CreateCompatibleDC(&dc); /?V-  
 CBitmap*pOld=tdc.SelectObject(&bm); $M$-c{>s  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I2,AT+O<  
 tdc.SelectObject(pOld); [* |+ it+!  
 BITMAP btm; }-T,cA_H|  
 bm.GetBitmap(&btm); q RRvZhf  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r$Oa  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); :4r*Jju<V  
 BITMAPINFOHEADER bih; AP ]`'C  
 bih.biBitCount=btm.bmBitsPixel; P#[?Kfi  
 bih.biClrImportant=0; >.uIp4@(  
 bih.biClrUsed=0; wVc ^l  
 bih.biCompression=0; y<c7RK]  
 bih.biHeight=btm.bmHeight; 3`Xzp  
 bih.biPlanes=1; dq0!.gBT2  
 bih.biSize=sizeof(BITMAPINFOHEADER); /<"ok;Pu7  
 bih.biSizeImage=size; K{ntl-D&y  
 bih.biWidth=btm.bmWidth; wEQZ9?\  
 bih.biXPelsPerMeter=0; msQ?V&+<  
 bih.biYPelsPerMeter=0; LG??Q+`l  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1jpft3*x  
 static int filecount=0; RNt9Qdr4y  
 CString name; '($$-P\/  
 name.Format("pict%04d.bmp",filecount++); %l!- rXp  
 name=m_Path+name; ZVrZkd `  
 BITMAPFILEHEADER bfh; 8d&%H,  
 bfh.bfReserved1=bfh.bfReserved2=0; }hcY5E-n  
 bfh.bfType=((WORD)('M'<< 8)|'B'); o4agaA3k  
 bfh.bfSize=54+size; ]Qe"S>,?`  
 bfh.bfOffBits=54; Lb{.}  
 CFile bf; *&hbfsP:  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ NPDMv |4  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); TIK'A<  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); RYdI$&]  
  bf.WriteHuge(lpData,size); AHHV\r  
  bf.Close(); 'X`W+=T$  
  nCount++; ,hm&]  
 } as@? Kv  
 GlobalFreePtr(lpData); %AmyT  
 if(nCount==1) i1*0'x  
  m_Number.Format("%d picture captured.",nCount); ~ e a K]|  
 else ~.tYYX<  
  m_Number.Format("%d pictures captured.",nCount); R@U4Ae{+  
  UpdateData(FALSE); AJ)&+H  
} ;s-@m<  
tq51;L  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 45OAJ?N  
{ nYe:$t3F=  
 if(pMsg -> message == WM_KEYDOWN) 9Q'[>P=1  
 { p1W6s0L  
  if(pMsg -> wParam == VK_ESCAPE) )KGz -!1c  
   return TRUE; #w:nj1{_  
  if(pMsg -> wParam == VK_RETURN) gEw9<Y  
   return TRUE; 0E)M6 jJ  
 } nj1PR`AE  
 return CDialog::PreTranslateMessage(pMsg); 3eB)X2~   
} }F|B'[wn  
hE<Sm*HU  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) EV7lgKM^  
{ &xp]9$  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ l=x(   
  SaveBmp(); E'NS$,h  
  return FALSE; 2jxIr-a1G  
} }(,{^".[}  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ h\Q@zR*0a  
 CMenu pop; e3?z^AUXm  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); M27H{} v  
 CMenu*pMenu=pop.GetSubMenu(0); u4bVp+  
 pMenu->SetDefaultItem(ID_EXITICON); qh6rMqq  
 CPoint pt; }0iHf'~DH*  
 GetCursorPos(&pt); Xz9[0;Q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); qW'L}x  
 if(id==ID_EXITICON) J~50#vHY  
  DeleteIcon(); Nr).*]g@~  
 else if(id==ID_EXIT) dGz4`1(>  
  OnCancel(); Z] x6np  
 return FALSE; mI]gDL1  
} 5"X@<;H%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); %0Qq~J@Lu  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e1%kW1Z9  
 AddIcon(); lD-2 5~YV  
 return res; ^Ai QNL}  
} 6ud<U#\b&  
>0uj\5h)I]  
void CCaptureDlg::AddIcon() {s@ 0<!  
{ 5:C>:pAV  
 NOTIFYICONDATA data; >s1?rC  
 data.cbSize=sizeof(NOTIFYICONDATA); a6O <t;&  
 CString tip; *adznd  
 tip.LoadString(IDS_ICONTIP); `r-3"or/$  
 data.hIcon=GetIcon(0); '+3C2!  
 data.hWnd=GetSafeHwnd(); 6 N:Ps8Hg  
 strcpy(data.szTip,tip); Zo }^"u  
 data.uCallbackMessage=IDM_SHELL; IAmZ_2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; e m0 hTxb  
 data.uID=98; !~vx|_$#  
 Shell_NotifyIcon(NIM_ADD,&data); <0qhc$M  
 ShowWindow(SW_HIDE); H6Bw3I[  
 bTray=TRUE; lJdYR'/Wd  
} j; R20xf0  
B|,d  
void CCaptureDlg::DeleteIcon() 3s67)n  
{ <]X 6%LX  
 NOTIFYICONDATA data; 9X +dp  
 data.cbSize=sizeof(NOTIFYICONDATA); FFN Sn  
 data.hWnd=GetSafeHwnd(); L ./c#b!{  
 data.uID=98; g-1j#V`5  
 Shell_NotifyIcon(NIM_DELETE,&data); X$6QQnyR  
 ShowWindow(SW_SHOW); [J(b"c6  
 SetForegroundWindow(); YD0hDp  
 ShowWindow(SW_SHOWNORMAL); adAdX;@e`  
 bTray=FALSE; $R NHRA.  
} +\)Y,@cw  
vU]n0)<KB  
void CCaptureDlg::OnChange() g"(@+\XZH"  
{ =\oL'>q  
 RegisterHotkey(); #dD0vYT&od  
} ~*9Ue@  
&Yc'X+'4  
BOOL CCaptureDlg::RegisterHotkey() x 4sIZe+  
{ y)a)VvU":  
 UpdateData(); &U7h9o H  
 UCHAR mask=0; MvnQUZ  
 UCHAR key=0; = ^Vp \  
 if(m_bControl) 6(uZn=  
  mask|=4; WiZTE(NM`  
 if(m_bAlt) .l5-i@=W  
  mask|=2; . UH'U\M  
 if(m_bShift) N u\<Xr8  
  mask|=1; f-ceDn  
  key=Key_Table[m_Key.GetCurSel()]; Dln1 R[  
 if(bRegistered){ 9%"`9j~H>  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1uCF9P ai  
  bRegistered=FALSE; >tx[UF@P@  
 } SM2N3"\  
 cMask=mask; Bq1}"092  
 cKey=key; ewHs ]V+U  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); DdU w~n,  
 return bRegistered; :Fu7T1  
} {$i>\)  
[t$ r)vX  
  四、小结 aM(#J7;  
P=6d<no&<  
  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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