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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: Ao8ua|:  
  8 E\zjT!#\  
  一、实现方法 I51]+gEN  
$uDgBZA\  
  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: Qgj# k  
OU/}cu  
#pragma data_seg("shareddata") U,#x\[3!Jt  
HHOOK hHook =NULL; //钩子句柄 lQ`=PFh  
UINT nHookCount =0; //挂接的程序数目 :>{!%-1Z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 H^*AaA9-   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 #| _VN %!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey m..ajYSQ  
static int KeyCount =0; &{.IUg  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Z8ea)_ {#  
#pragma data_seg() \hgd&H0UU  
P0}{xq'k9v  
  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。 =yZq]g6Q  
Zh;wQCDj  
  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: &Y?t  
88v8lt;R  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR k3qQU)  
cKey,UCHAR cMask) <`uu e  
{ N'VTdf?  
 BOOL bAdded=FALSE; zp;!HP;/=  
 for(int index=0;index<MAX_KEY;index++){ uL^; i""  
  if(hCallWnd[index]==0){ ]|tg`*l!>  
   hCallWnd[index]=hWnd; {73V?#P4  
   HotKey[index]=cKey; B4RrUA32  
   HotKeyMask[index]=cMask; K 77iv  
   bAdded=TRUE; W+#Q>^Q>  
   KeyCount++; 8F8?1  
   break; g~y0,0'j1\  
  } yO1 7C  
 } g,._3.D  
 return bAdded; YUEyGhkMV{  
} 6/S. sj~  
//删除热键 y|ZL< L  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1OM Xg=Y  
{ Gy/w #4xj  
 BOOL bRemoved=FALSE; uKP4ur@1  
 for(int index=0;index<MAX_KEY;index++){ FSA%,b; U  
  if(hCallWnd[index]==hWnd){ \uOM,98xS  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ '_G\_h}5  
    hCallWnd[index]=NULL; q k^FyZ<  
    HotKey[index]=0; I;t@wbY,  
    HotKeyMask[index]=0; tJ6@Ot  
    bRemoved=TRUE; J;>epM ;*  
    KeyCount--; CVa>5 vt  
    break; 1z8"Gk6  
   } z9ADF(J?0'  
  } ]@Zv94Z(  
 } 6i[Ts0H%<!  
 return bRemoved; >NBc-DX^  
} 'Nl hLu  
nU>P%|loXx  
pNb2t/8%%  
  DLL中的钩子函数如下: Sk|e#{  
)*]A$\Oc[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) R7Y_ 7@p  
{ x8rg/y  
 BOOL bProcessed=FALSE; =:s`C,l.4  
 if(HC_ACTION==nCode) U S ALoe  
 { ;n Bf  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Wn=sF,c  
   switch(wParam) &" t~d}Rg  
   {  w. k9{f  
    case VK_MENU: t<##0#xS.  
     MaskBits&=~ALTBIT; FYYc+6n  
     break; T%eBgseS  
    case VK_CONTROL: JI-i7P  
     MaskBits&=~CTRLBIT; cpjwc@UMe  
     break; H:c5 q0O^x  
    case VK_SHIFT: bXnUz?1!d  
     MaskBits&=~SHIFTBIT; UUV5uDe>i  
     break; F<I*?${[  
    default: //judge the key and send message ;98&5X\u<  
     break; [nO3%7t@  
   } $K^l=X  
   for(int index=0;index<MAX_KEY;index++){ #h[>RtP:  
    if(hCallWnd[index]==NULL) (I}owr5:  
     continue; eK:?~BI!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %1Q:{m  
    { py'vD3Q  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Gw<D'b)!  
     bProcessed=TRUE; AabQ)23R2  
    } =PRQ3/?5  
   } ,- AF8BP  
  } n?@zp<  
  else if((lParam&0xc000ffff)==1){ //有键按下 s=n4'`y1  
   switch(wParam) Qfn:5B]tI  
   { #<*.{"T  
    case VK_MENU: s?EQ  
     MaskBits|=ALTBIT; -O *_+8f  
     break; t<Acq07  
    case VK_CONTROL: 1nAm\/&  
     MaskBits|=CTRLBIT; rC-E+%y  
     break; oPmz$]_Z  
    case VK_SHIFT: u8zL[] >  
     MaskBits|=SHIFTBIT; 0~ho/_  
     break; zzf@U&x<  
    default: //judge the key and send message E#KZZ lbx  
     break; r W`7<3  
   } 5 b} w  
   for(int index=0;index<MAX_KEY;index++){ nEsD+ }E?  
    if(hCallWnd[index]==NULL) zo ?RFn  
     continue; |0i{z(B  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [MpWvLP"x  
    { 7 XxZF43  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); i=xh;yb|  
     bProcessed=TRUE; :01d9|#  
    } wG,"X'1  
   } MR1I"gqE}I  
  } x2B8G;6u  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 `}?;Ow&2CY  
   for(int index=0;index<MAX_KEY;index++){ QOXo(S  
    if(hCallWnd[index]==NULL) 0 %~~IT}U  
     continue; jB?SX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) w.x&3aG  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  +|LM"  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 H4y9\ -  
   } ^N/d`IAjv  
  } r ]7: ?ir  
 } wo0j/4o  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O^MI073Q>t  
} \t!~s^Oox  
vS8& ,wJ!  
  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: 7%  D4  
rE m/Q!  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v])ew|  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); OE@[a  
Q7aPW\-  
  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: V5K/)\#  
0>od1/`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'OA*aQ=K  
{ MrR`jXz  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) B.; qvuM~  
 { H'k}/<%Q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;?/5Mr  
  SaveBmp(); Y$ jX  
  return FALSE; I<#X#_YP  
 } +Hu\b&g  
 …… //其它处理及默认处理 G3DgB!  
} ov_l)vt  
G`FYEmD  
I}_}VSG(  
  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。 BY~Tc5  
vIRT$W' O}  
  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。 fxd+0R;f  
'[WL8,.Q  
  二、编程步骤 Z5v dH5?!r  
vxmX5.  
  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"; -0^]:  
VM%g QOo<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; t+U.4mS-  
KZ%i&w#<  
  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; |]9@JdmV  
G!6b )4L-  
  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; 5sT3|yq  
to?!qxn  
  5、 添加代码,编译运行程序。 1 sHjM %  
mXz*Gi  
三、程序代码 zFjz%:0  
*a Z1 4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9O 'j+?(`@  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 3=d%WPgQ  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,ucRQ&P  
#if _MSC_VER > 1000 ^sf,mM~D  
#pragma once F@?-^ E@  
#endif // _MSC_VER > 1000 inaO{ny y  
#ifndef __AFXWIN_H__ Rf!v{\  
#error include 'stdafx.h' before including this file for PCH UH MJ(.Wa-  
#endif +VkL?J  
#include "resource.h" // main symbols ?h[HC"V/2  
class CHookApp : public CWinApp (,h2qP-;ud  
{ r-y;"h'  
 public: m#'eDO:  
  CHookApp(); UQu6JkbLL  
  // Overrides UQDAql  
  // ClassWizard generated virtual function overrides MKfK9>a  
  //{{AFX_VIRTUAL(CHookApp) pT|s#-}  
 public: G=zNZ  
  virtual BOOL InitInstance(); vclc%ws  
  virtual int ExitInstance(); |*c1S -#  
  //}}AFX_VIRTUAL Tdcc<T  
  //{{AFX_MSG(CHookApp) gML8lu0)  
  // NOTE - the ClassWizard will add and remove member functions here. gxl7j Y  
  // DO NOT EDIT what you see in these blocks of generated code ! $E@n;0P  
  //}}AFX_MSG E<jajYj  
  DECLARE_MESSAGE_MAP() Lng. X8D  
}; GNJ /|9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); M 2hZ'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); xqX3uq  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1'o[9-  
BOOL InitHotkey(); r &.~ {  
BOOL UnInit(); JN/=x2n.  
#endif UfX~GC;B  
zcP=+Y)YA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. c]u ieig0~  
#include "stdafx.h" tpGT~Y(  
#include "hook.h" ye.6tlW  
#include <windowsx.h> oks;G([  
#ifdef _DEBUG @%,~5{Ir  
#define new DEBUG_NEW on 7 n4  
#undef THIS_FILE v":q_w<k  
static char THIS_FILE[] = __FILE__; :6Nb,Hh~  
#endif 1%v6d !  
#define MAX_KEY 100 |<u+Xi ~  
#define CTRLBIT 0x04 cANt7  
#define ALTBIT 0x02 cTq@"v di  
#define SHIFTBIT 0x01 4G,FJjE`p  
#pragma data_seg("shareddata")  2 q4p-  
HHOOK hHook =NULL; 9K@ I  
UINT nHookCount =0; &\ 9%;k  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey f- XUto  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &<;T$Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey vqN/crJ@  
static int KeyCount =0; DP @1to@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift HF FG4'  
#pragma data_seg() DT`HS/~fH  
HINSTANCE hins; *V kaFQZ$,  
void VerifyWindow(); M*0^<e~]F  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 84WD R?  
//{{AFX_MSG_MAP(CHookApp) O z6$u  
// NOTE - the ClassWizard will add and remove mapping macros here. 9I/l+IS"X  
// DO NOT EDIT what you see in these blocks of generated code! PRU&y/zZmG  
//}}AFX_MSG_MAP -W9DH^EL<  
END_MESSAGE_MAP() Nud =K'P=  
1\fx57a\  
CHookApp::CHookApp() )YAa7\Od  
{ vcFR Td  
 // TODO: add construction code here, 'd~(=6J  
 // Place all significant initialization in InitInstance VZt%cq  
} Wo "s;Z  
S' $;  
CHookApp theApp; CK[8y&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) [P+kQBL pL  
{ P4#i]7%  
 BOOL bProcessed=FALSE; 3Rb#!tx9  
 if(HC_ACTION==nCode) 4MPy}yT*  
 { NVx>^5QV  
  if((lParam&0xc0000000)==0xc0000000){// Key up {N}az"T4f  
   switch(wParam) 7n#-3#_mG  
   { b#?sx"z  
    case VK_MENU: ``CM7|)>`  
     MaskBits&=~ALTBIT; 7"'RE95  
     break; >UCg3uFj  
    case VK_CONTROL: TnN yth wZ  
     MaskBits&=~CTRLBIT; ]R""L<K%HF  
     break; P*!`AWn  
    case VK_SHIFT: JH\:9B+:L  
     MaskBits&=~SHIFTBIT; Hl}lxK,]  
     break;  :f[ w  
    default: //judge the key and send message eE'P)^KV  
     break; LL e*| :  
   } p/ (Z2N"  
   for(int index=0;index<MAX_KEY;index++){ #$Zx].[lc  
    if(hCallWnd[index]==NULL) , @jtD*c)  
     continue; fx|d"VF[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t}k:wzZ@  
    { mI7lv;oN<5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); f,yl'2{  
     bProcessed=TRUE; dE"_gwtX  
    } #HgN wM  
   } "Vq= Ph  
  } J>v[5FX+  
  else if((lParam&0xc000ffff)==1){ //Key down l+6c|([  
   switch(wParam) G{[w+ObX  
   { 6m$X7;x}  
    case VK_MENU: QwX81*nx  
     MaskBits|=ALTBIT; Ypzmc$Xfu  
     break; F{jxs/~  
    case VK_CONTROL: J+t51B(a  
     MaskBits|=CTRLBIT; O(I^:_eH  
     break; Xr K29a  
    case VK_SHIFT: %w^*7Oi  
     MaskBits|=SHIFTBIT; A{s -g>s  
     break; t[TM\j0jW  
    default: //judge the key and send message iQ" LIeD  
     break; 3g4=as4w  
   } fJr EDj4(  
   for(int index=0;index<MAX_KEY;index++) Cdz?+hb  
   { 0 8)f  
    if(hCallWnd[index]==NULL) \H .Cmm^I  
     continue; [@9S-$Xa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _{`Z?lt  
    { >s5}pkAv|e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =J1V?x=l@  
     bProcessed=TRUE; p K-tj  
    } }ex4dhx2M  
   } $\ZWQct  
  } ]<<,{IQ  
  if(!bProcessed){ v'?Smd1v /  
   for(int index=0;index<MAX_KEY;index++){ 9KX% O-'  
    if(hCallWnd[index]==NULL) B(M-;F  
     continue; `F/R:!v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) E "=4(   
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  +#,J`fV%  
   } Z5TA4Q+Q  
  } ufk2zL8y  
 } = vqJ0!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); b4L7]&  
} !AXLoq$SY  
>0@w"aKn  
BOOL InitHotkey() ;)h?P.]  
{ :!s7B|_U  
 if(hHook!=NULL){ s/hgWW$  
  nHookCount++; #~'d Y\&  
  return TRUE; #qVTB@d  
 } 9@CRL=  
 else 8|@) #:  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jv.tg,c_6  
  if(hHook!=NULL) vk E]$4P[$  
   nHookCount++; i&H^xgm  
  return (hHook!=NULL); j-BNHX  
} JL G!;sov  
BOOL UnInit() C')KZ|JIC  
{ iT&4;W=72~  
 if(nHookCount>1){ rSv,;v  
  nHookCount--; *DIY;)K  
  return TRUE; *=oO3c0|b,  
 } 4AEw[(t  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 'GezIIaH  
 if(unhooked==TRUE){ Jd/d\P  
  nHookCount=0; d,?D '/  
  hHook=NULL; EeMKo  
 } =7e!'cF[  
 return unhooked; Ze>R@rK  
} P Ptmh. }e  
|a03S Zx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Lp-$Ie  
{ &ic'!h"  
 BOOL bAdded=FALSE; 3ux7^au  
 for(int index=0;index<MAX_KEY;index++){ ^Lb\k|U ,\  
  if(hCallWnd[index]==0){ 2'=)ese  
   hCallWnd[index]=hWnd; eV!(a8  
   HotKey[index]=cKey; MH)V=xU|)  
   HotKeyMask[index]=cMask; H_@6!R2  
   bAdded=TRUE; DNZ,rL:h  
   KeyCount++; b4wT3  
   break; 445JOP  
  } 7yu-xnt3s  
 } B?&0NpVD  
 return bAdded; dBA&NW07  
} ,gk'8]  
A5F (-  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) p#qla'  
{ 8nBYP+t,e  
 BOOL bRemoved=FALSE; #Hr'plg 8  
 for(int index=0;index<MAX_KEY;index++){ s:l H4B  
  if(hCallWnd[index]==hWnd){ y@v)kN)Y9\  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {HY3E}YJL  
    hCallWnd[index]=NULL; <ot`0  
    HotKey[index]=0; KWDH 35  
    HotKeyMask[index]=0; tJu:N'=Dy  
    bRemoved=TRUE; m7NWgXJ  
    KeyCount--; c`x4."m  
    break; ]v}W9{sY  
   } vfn[&WN]  
  } FVkl# Qy~  
 } 5uG^`H@X  
 return bRemoved; Ns YEBT7f  
} { Zv%DV4_$  
]#4kqj}  
void VerifyWindow() q !9;JrX  
{ 00D.Jn  
 for(int i=0;i<MAX_KEY;i++){ ;bG?R0a  
  if(hCallWnd!=NULL){ u~*A-X [  
   if(!IsWindow(hCallWnd)){ f_PH?  
    hCallWnd=NULL; + a*Ic8*  
    HotKey=0; - q9m@!L  
    HotKeyMask=0; ZDaHR-%Y  
    KeyCount--; d)U(XiK'  
   } | eCVq(R  
  } UTE6U6  
 } 4jDi3MMU9  
} yw:%)b{  
2He R1m<  
BOOL CHookApp::InitInstance() Hd;NvNS  
{ K:-jn}i?/  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~D5FnN9  
 hins=AfxGetInstanceHandle(); pHb,*C</  
 InitHotkey(); DjaXJ?'  
 return CWinApp::InitInstance(); pjS##pgVq  
} 075IW"p'  
esZhX)dS  
int CHookApp::ExitInstance() 6bs-&Vf  
{ lIEZ=CEmY  
 VerifyWindow(); msCz\8Xd  
 UnInit(); * G*VY#L  
 return CWinApp::ExitInstance(); >QJDO ]~V  
} H0tu3Pqk  
i[LnU#+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ~M* UMF^  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) CLZ j=J2  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ G6{ PrV#  
#if _MSC_VER > 1000 @i'D)6sC  
#pragma once IAkQR0fcN  
#endif // _MSC_VER > 1000 !wE% <Fh  
uPcx6X3]  
class CCaptureDlg : public CDialog Mu:zWLM*M  
{ ?r(vXq\  
 // Construction &S*{a  
 public: |O)ZjLx  
  BOOL bTray; ~0024B[G  
  BOOL bRegistered;  Q'cWqr  
  BOOL RegisterHotkey(); x])j]k  
  UCHAR cKey; uL7}JQ,  
  UCHAR cMask; gA_oJW4_  
  void DeleteIcon(); -">Tvi4  
  void AddIcon(); g qORE/[  
  UINT nCount; %.Btf3y~  
  void SaveBmp(); 2vB,{/GXP  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor GD}rsBQNkJ  
  // Dialog Data .e5@9G.jb  
  //{{AFX_DATA(CCaptureDlg) B!`.,3  
  enum { IDD = IDD_CAPTURE_DIALOG }; B QUYT/$(  
  CComboBox m_Key; a'-xCV|^  
  BOOL m_bControl; r UZN$="N  
  BOOL m_bAlt; ?nu<)~r53  
  BOOL m_bShift; J R~s`>2  
  CString m_Path; 7}\AhQ, S  
  CString m_Number; [-#1;!k  
  //}}AFX_DATA OY|9V  
  // ClassWizard generated virtual function overrides )40YA\V  
  //{{AFX_VIRTUAL(CCaptureDlg) Ie Chz d  
 public: ,1|=_M31  
  virtual BOOL PreTranslateMessage(MSG* pMsg); qooTRqc#,  
 protected: 7o+VhW<|5  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3Jd a:  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); &q4~WRnzJk  
  //}}AFX_VIRTUAL ?5Z-w  
  // Implementation HW_2!t_R  
 protected: _{^F8  
  HICON m_hIcon; \QSD*  
  // Generated message map functions ~ cu+QR)  
  //{{AFX_MSG(CCaptureDlg) c uAp,!  
  virtual BOOL OnInitDialog(); K4NzI9@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); J+0 ?e9  
  afx_msg void OnPaint(); b; ;y|H  
  afx_msg HCURSOR OnQueryDragIcon(); 6,CK1j+tZ  
  virtual void OnCancel(); Yx. t+a-  
  afx_msg void OnAbout(); xPT$d,~"  
  afx_msg void OnBrowse(); A ?~4Pe  
  afx_msg void OnChange(); lr)MySsu#H  
 //}}AFX_MSG <.lN'i;(  
 DECLARE_MESSAGE_MAP() y&4im;X0  
}; WH $*\IGJL  
#endif *x#5S.i1  
-"^"& )  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file +&X>ul  
#include "stdafx.h" vcy+p]6KE-  
#include "Capture.h" |M<R{Tt}nf  
#include "CaptureDlg.h" } -hH2  
#include <windowsx.h> \sVzBHy d  
#pragma comment(lib,"hook.lib") |`wJ {-  
#ifdef _DEBUG yYk?K<ou  
#define new DEBUG_NEW T8T,G4Q  
#undef THIS_FILE >i1wB!gc8  
static char THIS_FILE[] = __FILE__; A}pe>ja   
#endif  q _;#EV  
#define IDM_SHELL WM_USER+1 8BS$6Pa  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 75Bn p9  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Oh`Pf;.z%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; z;YX 2G/{  
class CAboutDlg : public CDialog 2j>C4Ck  
{ zS?}3#g0u  
 public: | ~D~#Nz  
  CAboutDlg(); ]%Whtj.,x7  
  // Dialog Data VJgf, 5 (N  
  //{{AFX_DATA(CAboutDlg) sh<JB`^$(?  
  enum { IDD = IDD_ABOUTBOX }; 8p~[8}  
  //}}AFX_DATA t nmz5Q  
  // ClassWizard generated virtual function overrides ac4dIW{$3  
  //{{AFX_VIRTUAL(CAboutDlg) 3@;24X  
 protected: [.G~5%974  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q6X}R,KA1  
  //}}AFX_VIRTUAL -Xgup,}?  
  // Implementation 7BA9zs392  
 protected: h7]>b'H  
  //{{AFX_MSG(CAboutDlg) 5FNf)F   
  //}}AFX_MSG p_3VFKq>0  
  DECLARE_MESSAGE_MAP() 5bK:sht  
}; Zq}Cl'f  
7,9zj1<  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) c%n%,R>  
{ #0qMYe>Y  
 //{{AFX_DATA_INIT(CAboutDlg) = 6w(9O  
 //}}AFX_DATA_INIT t9 id^  
} {K=[Fu=  
{}PBYX R  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) zgpv I~Ck  
{ TU8K\;l]  
 CDialog::DoDataExchange(pDX); ]7dal [i  
 //{{AFX_DATA_MAP(CAboutDlg) \l;H !y[  
 //}}AFX_DATA_MAP D>q?My  
} ;}4e+`fF|  
1\,wV,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g5&,l  
 //{{AFX_MSG_MAP(CAboutDlg) dI8y}EbE~  
 // No message handlers f9E.X\"  
 //}}AFX_MSG_MAP bzMs\rj\  
END_MESSAGE_MAP() Cd'SPaR  
>\!>CuU  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) }xzbg  
: CDialog(CCaptureDlg::IDD, pParent) ~hA;ji|I  
{ oakm{I|k}  
 //{{AFX_DATA_INIT(CCaptureDlg) L@5g#mSl  
  m_bControl = FALSE; Zo(QU5m0  
  m_bAlt = FALSE; 2! bE|  
  m_bShift = FALSE; fm%-wUgj  
  m_Path = _T("c:\\"); Op<|Oz$Q|l  
  m_Number = _T("0 picture captured."); myY@Wp  
  nCount=0; {5:V hW}  
  bRegistered=FALSE; ;6zp,t0  
  bTray=FALSE; ? #;zB  
 //}}AFX_DATA_INIT @)wNINvD  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Ne,u\q3f  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); x~O_v  
} kIUb`b>B  
.hXdXY  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) d5B96;3  
{ HV6'0_R0  
 CDialog::DoDataExchange(pDX); ]O;Rzq{D(  
 //{{AFX_DATA_MAP(CCaptureDlg) )%5T*}j  
  DDX_Control(pDX, IDC_KEY, m_Key); s*pgR=dZZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); h|'T'l&z  
  DDX_Check(pDX, IDC_ALT, m_bAlt); IC7S +v  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4mzWNr>fb  
  DDX_Text(pDX, IDC_PATH, m_Path); 7_#i,|]58  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =i)k@w_(x  
 //}}AFX_DATA_MAP 7^:0?Q  
} 3~!PJI1  
eqE%ofW  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) \=/^H  
//{{AFX_MSG_MAP(CCaptureDlg) Me*]Bh  
 ON_WM_SYSCOMMAND() KI Ua  
 ON_WM_PAINT() wKAc ;!  
 ON_WM_QUERYDRAGICON() (Sg52zv  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^E8eW  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~\m|pxcj  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _7zER6#}  
//}}AFX_MSG_MAP d6k`=Hlg  
END_MESSAGE_MAP() 0Sz iTM  
G" Fd]'  
BOOL CCaptureDlg::OnInitDialog() =#<TE~n2(  
{ #zcnc$x\  
 CDialog::OnInitDialog(); [0e}%!%M  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); VXAgp6  
 ASSERT(IDM_ABOUTBOX < 0xF000); zZ=.riK  
 CMenu* pSysMenu = GetSystemMenu(FALSE); P1 `-OM  
 if (pSysMenu != NULL) Gv}h/zu-  
 { 9m fYB  
  CString strAboutMenu; e$^O_e  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Ci ? +Sl  
  if (!strAboutMenu.IsEmpty()) ^CwzA B  
  { o5FBqt  
   pSysMenu->AppendMenu(MF_SEPARATOR); obE_`u l#  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 93d ht  
  } ^\<1Y''  
 } xe6 2gaT  
 SetIcon(m_hIcon, TRUE); // Set big icon n300kpv  
 SetIcon(m_hIcon, FALSE); // Set small icon nNFZ77lg  
 m_Key.SetCurSel(0); tXTa>Q  
 RegisterHotkey(); i.Qy0  
 CMenu* pMenu=GetSystemMenu(FALSE); a{6rQ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); d(L u|/~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b='YCa  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); NY ZPh%x  
 return TRUE; // return TRUE unless you set the focus to a control J,E'F!{  
} f&Bu_r  
%o +VZEH3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) $CVbc%  
{ )*iSN*T8q  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) jn#  
 { <5~} !N X`  
  CAboutDlg dlgAbout; Ee##:I[z  
  dlgAbout.DoModal(); X] /r'Tz  
 } s Hu~;)  
 else 4PEJ}B W  
 { ~J6c1jG  
  CDialog::OnSysCommand(nID, lParam); dt  4_x1  
 } xF_ Y7rw1w  
} -)aBS3  
4 |N&Y  
void CCaptureDlg::OnPaint() lfKrd3KS_  
{ Dg@>d0FW  
 if (IsIconic()) 3D k W  
 { Px}#{fkS  
  CPaintDC dc(this); // device context for painting mMw&{7b:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); U&/Jh^Yy  
  // Center icon in client rectangle 9\i,3:Qc  
  int cxIcon = GetSystemMetrics(SM_CXICON); SD6xi\8  
  int cyIcon = GetSystemMetrics(SM_CYICON); CV 4r31w  
  CRect rect; vpUS(ztvs  
  GetClientRect(&rect); ^6ZA2-f/<8  
  int x = (rect.Width() - cxIcon + 1) / 2; v>$GVCY  
  int y = (rect.Height() - cyIcon + 1) / 2; @`?"#^jT  
  // Draw the icon lYeot8  
  dc.DrawIcon(x, y, m_hIcon); X .g")Bt7  
 } )=X8kuB~  
 else 1k\1U  
 { 3M(:}c  
  CDialog::OnPaint(); |_%|  
 } #:3E.=  
} 59p'Ega.  
5sx-u!7  
HCURSOR CCaptureDlg::OnQueryDragIcon() t_WNEZW7f  
{ oG5JJpLT  
 return (HCURSOR) m_hIcon; 3Cwqy#X#8  
} VWmZ|9Ri  
o;\0xuM@  
void CCaptureDlg::OnCancel() 2HMlh.R(C  
{ Srz.-,2PF  
 if(bTray) .)B_~tct  
  DeleteIcon(); yU*j{>%RsK  
  CDialog::OnCancel(); 'j!7 O+7y  
} 6pQ#Zg()vp  
^[8e|,U  
void CCaptureDlg::OnAbout() ^owEB%  
{ X{ZBS^M  
 CAboutDlg dlg; . dVo[m;  
 dlg.DoModal(); z8= Gc$w!  
} D C mNxN  
cu|#AW  
void CCaptureDlg::OnBrowse() r+>E`GGQ  
{ KC? hsID{  
 CString str; W<B8PS$  
 BROWSEINFO bi; /U6G?3b  
 char name[MAX_PATH]; 5 8p_b  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); _pKW($\  
 bi.hwndOwner=GetSafeHwnd(); -";'l @D=  
 bi.pszDisplayName=name; VA)3=82n  
 bi.lpszTitle="Select folder"; f 7et  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 7^Jszd:c08  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^Y ~ ,s  
 if(idl==NULL) =6q?XOM  
  return; o'%F*>#v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); C&3#'/&  
 str.ReleaseBuffer(); #* S0d1  
 m_Path=str; )AqM?FE4R  
 if(str.GetAt(str.GetLength()-1)!='\\') OtF{=7  
  m_Path+="\\"; *6q8kQsz^1  
 UpdateData(FALSE); \y: 0+s/  
} .F?yt5{5No  
`t:7&$>T  
void CCaptureDlg::SaveBmp() T2} I,{U  
{ <i~ ( 8F\  
 CDC dc; <h U ZD;  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1p23&\\~  
 CBitmap bm; Nj.(iBmr  
 int Width=GetSystemMetrics(SM_CXSCREEN); &m4 \"X@  
 int Height=GetSystemMetrics(SM_CYSCREEN); M,t8<y4 W/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 23y7l=.b/  
 CDC tdc; djPr 4Nog  
 tdc.CreateCompatibleDC(&dc); v (=fV/  
 CBitmap*pOld=tdc.SelectObject(&bm); rc*&K#? B  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); RV^2[Gdi  
 tdc.SelectObject(pOld); 4G@vO {$  
 BITMAP btm; [lQp4xgxi  
 bm.GetBitmap(&btm); ,ye>D='  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; %g0"Kj5  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); HHCsWe-  
 BITMAPINFOHEADER bih; c$?qN&X_K  
 bih.biBitCount=btm.bmBitsPixel; eP'e_E  
 bih.biClrImportant=0; nPfVZGt  
 bih.biClrUsed=0; <hdR:k@ #  
 bih.biCompression=0; u-pE ;|  
 bih.biHeight=btm.bmHeight; .ymR%X_k  
 bih.biPlanes=1; s:R>uGYOd  
 bih.biSize=sizeof(BITMAPINFOHEADER); }o=R7n%  
 bih.biSizeImage=size; doP4N6   
 bih.biWidth=btm.bmWidth; E`iT>+LG<  
 bih.biXPelsPerMeter=0; EFf<| v  
 bih.biYPelsPerMeter=0; mh.0% 9`9  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); T6Ue\Sp'  
 static int filecount=0; \@['V   
 CString name; rd0BvQ9TK  
 name.Format("pict%04d.bmp",filecount++); aAu upPu  
 name=m_Path+name; p4W->AVv$  
 BITMAPFILEHEADER bfh; sryujb.,  
 bfh.bfReserved1=bfh.bfReserved2=0; f>waF u-  
 bfh.bfType=((WORD)('M'<< 8)|'B'); {;Mcor3  
 bfh.bfSize=54+size; .+ai dWd  
 bfh.bfOffBits=54; 8 8pz<$  
 CFile bf; /Rx%}~x/m  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 11X-X  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); y$*Tbzp  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 8_Y{7;<ey  
  bf.WriteHuge(lpData,size); 6O$OM  
  bf.Close(); MrLDe {^C2  
  nCount++; mmTc.x h  
 } *u 3K8"XZ  
 GlobalFreePtr(lpData); }.o rfW  
 if(nCount==1) R7x4v  
  m_Number.Format("%d picture captured.",nCount); M)I&^mm39  
 else rA8neO)  
  m_Number.Format("%d pictures captured.",nCount); 3r+vpyu  
  UpdateData(FALSE); H]UM2.  
} 4eBM/i  
c(ZkK  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) SG8|xoL  
{ XdLB1H  
 if(pMsg -> message == WM_KEYDOWN) ]8d]nftY  
 { sA3 4`ZAa  
  if(pMsg -> wParam == VK_ESCAPE) f*1.Vg0`-  
   return TRUE; zg)Z2?K|;u  
  if(pMsg -> wParam == VK_RETURN) 1xL2f&bG  
   return TRUE; U,[vfSDGr  
 } '<>pz<c  
 return CDialog::PreTranslateMessage(pMsg); UR1U; k  
} 1f~unb\Gg  
{/XzIOO;b  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }j+ZF'#  
{ 'Xxt[Jy  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !j%vUe;t  
  SaveBmp(); k/j]*~"  
  return FALSE; yGZb  
} 6Nj\N oS  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Rzj5B\+Rk(  
 CMenu pop; 5mnIQ~psR  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); +QtK "5M  
 CMenu*pMenu=pop.GetSubMenu(0); ,K+K`"Oy  
 pMenu->SetDefaultItem(ID_EXITICON); _?Rprmjx}  
 CPoint pt; Jq<&`6hn  
 GetCursorPos(&pt); _j}|R(s*+V  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Zh{Pzyp  
 if(id==ID_EXITICON) a7%5Qg9B;  
  DeleteIcon(); 9,`WQ+OI  
 else if(id==ID_EXIT) #=OKY@z/  
  OnCancel(); 8JJqEkQ  
 return FALSE; 8}XtVF;  
} k9 .@S  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9=ns.r  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE)  J5*krH2i  
 AddIcon(); VI74{='=  
 return res; ,=Xr'7w,  
} PUuxKW}  
k_ UY^vz.  
void CCaptureDlg::AddIcon() g"`BNI]Qp  
{ Rd&2mL  
 NOTIFYICONDATA data; r0+lH:G*q  
 data.cbSize=sizeof(NOTIFYICONDATA); [v^T]L  
 CString tip; B~D{p t3y  
 tip.LoadString(IDS_ICONTIP); GXr9J rs.e  
 data.hIcon=GetIcon(0); &;&i#ZO  
 data.hWnd=GetSafeHwnd(); 3yszf Wr  
 strcpy(data.szTip,tip); (Dlh;Ic r9  
 data.uCallbackMessage=IDM_SHELL; /a [i:Oa#  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 2RFYnDN  
 data.uID=98; |cEJRs@B  
 Shell_NotifyIcon(NIM_ADD,&data); ONH!ms(kb  
 ShowWindow(SW_HIDE); =kp #v  
 bTray=TRUE; 47|Lk]+O  
} -y5^xR  
IlVz 5#R  
void CCaptureDlg::DeleteIcon() E/v.+m  
{ <1YINkRz  
 NOTIFYICONDATA data; (0/,R  
 data.cbSize=sizeof(NOTIFYICONDATA); umaF}}-Q{  
 data.hWnd=GetSafeHwnd(); (dd+wx't  
 data.uID=98; /BjM&v(5/  
 Shell_NotifyIcon(NIM_DELETE,&data); VUpa^R  
 ShowWindow(SW_SHOW); k |k  
 SetForegroundWindow(); i ?&t@"'  
 ShowWindow(SW_SHOWNORMAL); J3fk3d`2  
 bTray=FALSE; [=7=zV;}4  
} UbNA|`H  
b#`XmB  
void CCaptureDlg::OnChange() "(zvI>A  
{ 5\gL+ qM0  
 RegisterHotkey(); }Qyuy~-&^  
} BgRfy2:  
AFE6@/'  
BOOL CCaptureDlg::RegisterHotkey() ZUePHI-dP  
{ -sO[,  
 UpdateData(); ZG[P?fM  
 UCHAR mask=0; d3-F?i 5d  
 UCHAR key=0; O#LG$Y n*  
 if(m_bControl) Y)#x(s?t  
  mask|=4; jBZlN Ew  
 if(m_bAlt) M8dv y!D  
  mask|=2; vUm#^/#I  
 if(m_bShift) Zk,` Iq  
  mask|=1; JjA3G`m=  
  key=Key_Table[m_Key.GetCurSel()]; wJyrF  
 if(bRegistered){ jz,Mm,Gi  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); gZA[Sq  
  bRegistered=FALSE; _gU:!:}  
 } ?YE'J~0A6  
 cMask=mask; KaVNRS  
 cKey=key; g)0>J  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 21NGsG  
 return bRegistered; PLD&/SgP*  
} kY>jp@w V  
w>#{Nl7gz  
  四、小结 { 0\Ez}  
MWdev.m:Z  
  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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