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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: Br!;Ac&N  
  v7"VH90`!  
  一、实现方法 7Vy_Cec1  
u1 Q;M`+>  
  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: +ALrHFG  
nz3*s#k\-  
#pragma data_seg("shareddata") ~s+vJvWz  
HHOOK hHook =NULL; //钩子句柄 )7& -DI1  
UINT nHookCount =0; //挂接的程序数目 &#e;`(*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 bW=q G  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 i9L]h69r  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 4z(~)#'^  
static int KeyCount =0; b1?^9c#0d  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Ss%Cf6qdWL  
#pragma data_seg() g)#?$OhP"  
dM;\)jm  
  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。  oE+P=  
AAQ!8!  
  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: ee? d ?:L  
>8"(go+02  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR FygNWI'  
cKey,UCHAR cMask) A M[f  
{ zd[k|lj  
 BOOL bAdded=FALSE; C>Hdp_Lm  
 for(int index=0;index<MAX_KEY;index++){ 2OJlE) .  
  if(hCallWnd[index]==0){ *>a=ku:?  
   hCallWnd[index]=hWnd; WOn<;'}M&  
   HotKey[index]=cKey; bN/8 ~!  
   HotKeyMask[index]=cMask; R>0[w$  
   bAdded=TRUE; W^8  
   KeyCount++; d` ttWWPw  
   break; h,$CJdDY]  
  } %e]G]B%  
 } HDV-qYD|O~  
 return bAdded; R5ra*!|L)  
} ~2k.x*$  
//删除热键 )xy>:2!#Y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ]jD\4\M}  
{ -rU_bnm  
 BOOL bRemoved=FALSE; %nkP" Z#  
 for(int index=0;index<MAX_KEY;index++){ ;D~#|CB  
  if(hCallWnd[index]==hWnd){ NWn*_@7;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QQW}.>N  
    hCallWnd[index]=NULL; :6(\:  
    HotKey[index]=0; )G)6D"5,+G  
    HotKeyMask[index]=0; RyK~"CWT  
    bRemoved=TRUE; |p/ *OFC6  
    KeyCount--; w8X5kk   
    break; y-26\eY^P  
   } l+6c|([  
  } 8e-nzc,]  
 } A8.noV  
 return bRemoved; +UDt2  
} {`D]%eRO  
~Y`ys[Z m  
Ibz9j uY  
  DLL中的钩子函数如下: yo[Sh6r/9b  
|^-D&C(Eu  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7nT|yL?  
{ `+n0a@BVB  
 BOOL bProcessed=FALSE; &j:e<{@  
 if(HC_ACTION==nCode) :O413#8  
 { / ]8e[t>!f  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 ?TpjU*Cxy  
   switch(wParam) 2FuV%\p  
   {  =W7-;&  
    case VK_MENU: h |]cZMGo  
     MaskBits&=~ALTBIT; OpaRQ=  
     break; :j`f%Vg~x  
    case VK_CONTROL: [@9S-$Xa  
     MaskBits&=~CTRLBIT; _{`Z?lt  
     break; #; !@Pf  
    case VK_SHIFT: 32K& IfV  
     MaskBits&=~SHIFTBIT; FXo.f<U  
     break; z@VL?A(3  
    default: //judge the key and send message BX$<5S@  
     break; "9P @bA  
   } ^5s7mls  
   for(int index=0;index<MAX_KEY;index++){ `n>|rd  
    if(hCallWnd[index]==NULL) 8?82 p  
     continue; HK :K~h  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lPR^~&/  
    { KS8@A/f  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); SY5}Bu#  
     bProcessed=TRUE; (xW+* %  
    } =u}~\ 'd  
   } nT> v  
  } ke2dQ^kc4  
  else if((lParam&0xc000ffff)==1){ //有键按下 9xbT?$^  
   switch(wParam) :jv(-RTI  
   { L'Cd` .yVO  
    case VK_MENU: A4,%l\di<  
     MaskBits|=ALTBIT; BlpyE[h T  
     break; r5xm7- `c  
    case VK_CONTROL: X`_tm3HC  
     MaskBits|=CTRLBIT; 5[)5K?%  
     break; 8|@) #:  
    case VK_SHIFT: jv.tg,c_6  
     MaskBits|=SHIFTBIT; vk E]$4P[$  
     break; [[c0g6  
    default: //judge the key and send message 0]5X Tc3r  
     break;  jfK&CA  
   } ifS#9N|8  
   for(int index=0;index<MAX_KEY;index++){ >rlUV"8jY;  
    if(hCallWnd[index]==NULL) ynw(wSH=  
     continue; =)Hu(;Yv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9^DAlY,x.  
    { w>*Jgc@A*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); YT?Lt!cl=  
     bProcessed=TRUE; WD\Yx~o  
    } m4~ |z  
   } '1DY5`i{  
  } T/ECW  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 HTQTDbhV^  
   for(int index=0;index<MAX_KEY;index++){ FiMM-c|  
    if(hCallWnd[index]==NULL) _LZ(HTX~  
     continue; gd * b0(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) lZRO"[<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3U^Vz9LW  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ;-"!p  
   }  lha;|  
  } &iWTf K7  
 } F_0D)H)N@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); h;vY=r-  
} IT:WiMDQ}  
!4Zy$69R  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: _w\i~To!  
*Zg=cI@)(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \%r0'1f  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w/ ~\NI  
;+ C$EJw-  
  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: GXm#\)  
>"IG\//I  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) \},H\kK+^  
{ -3yK>\y=|  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 5ph CEKt;  
 { rZwSo]gp  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (z8ZCyq7r[  
  SaveBmp(); 6h5g!GQD  
  return FALSE; ! (lF#MG}  
 } 41=H&G&  
 …… //其它处理及默认处理 7WH'GoBh  
} 'qEw]l  
Z":m(}u O  
Vaf,  
  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。 syLdm3d|  
-zYa@PW  
  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。 3.Mpd  
LhKbZ oPp  
  二、编程步骤 hzk!H]>E  
4A"nm6  
  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"; C.ynOo,W  
j5R0e}/r  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; p,k1*|j  
h1 (i/{}:  
  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; Jc?zX8>Ae:  
G~C-tAB  
  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; 5\zR>Tg".  
(M|DNDM'd  
  5、 添加代码,编译运行程序。 ;39a`  
zd2_k 9  
三、程序代码 0kCo0{+n  
c;/vzIJj  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL e.L&A|  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 4Ia'Yr  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ,<+:xl   
#if _MSC_VER > 1000 } l+_KA  
#pragma once |LJv*  
#endif // _MSC_VER > 1000 @TW:6v`  
#ifndef __AFXWIN_H__ BZhf/{h[@  
#error include 'stdafx.h' before including this file for PCH clyp0`,7  
#endif ,7cw%mQA  
#include "resource.h" // main symbols lIEZ=CEmY  
class CHookApp : public CWinApp msCz\8Xd  
{ * G*VY#L  
 public: >QJDO ]~V  
  CHookApp(); =9 QyO h  
  // Overrides \i[N ";K  
  // ClassWizard generated virtual function overrides -[vw 8  
  //{{AFX_VIRTUAL(CHookApp) &+02Sn3A  
 public: a0]GQyIG  
  virtual BOOL InitInstance(); wQ+i l6  
  virtual int ExitInstance(); 837:;<T  
  //}}AFX_VIRTUAL @i'D)6sC  
  //{{AFX_MSG(CHookApp) cXt&k  
  // NOTE - the ClassWizard will add and remove member functions here. |1 qrU(  
  // DO NOT EDIT what you see in these blocks of generated code ! !XjZt  
  //}}AFX_MSG 8IL5 :7H8  
  DECLARE_MESSAGE_MAP() v -)<nox  
}; <(TAA15Xol  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Ep;?%o,G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0LC]%x+"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); indbg d  
BOOL InitHotkey(); @I1*b>X~<  
BOOL UnInit(); b(mZ/2,B  
#endif :(OV{ u  
WwoT~O8R  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.  * ;Q#UH  
#include "stdafx.h" H@zZ[  
#include "hook.h" c"k nzB vy  
#include <windowsx.h> /|NyO+Io  
#ifdef _DEBUG c99|+i50  
#define new DEBUG_NEW gO*Gf2AG  
#undef THIS_FILE 0=7Ud<  
static char THIS_FILE[] = __FILE__; ! 1?u0  
#endif @G#`uoD  
#define MAX_KEY 100 RB*z."  
#define CTRLBIT 0x04 R~A))4<%%  
#define ALTBIT 0x02 ":T"Y;  
#define SHIFTBIT 0x01 MY\mo,#  
#pragma data_seg("shareddata") aBQ--Sz  
HHOOK hHook =NULL; G+sB/l"  
UINT nHookCount =0; ~7j-OWz9  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey o6 NmDv5  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT N1g;e?T ':  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i)cG  
static int KeyCount =0; n&]J-^Tx  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift B ( h`~pb  
#pragma data_seg() hC{2LLu;n  
HINSTANCE hins; E{-pkqx  
void VerifyWindow(); f]2gjQHM  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -$%~EY}  
//{{AFX_MSG_MAP(CHookApp) 9\Rk(dd  
// NOTE - the ClassWizard will add and remove mapping macros here. &{WEtaXaa  
// DO NOT EDIT what you see in these blocks of generated code! 7 v3%dCvf  
//}}AFX_MSG_MAP aB G*  
END_MESSAGE_MAP() z,C>Rh9Id  
M{u7Ef  
CHookApp::CHookApp()  `m_f i  
{ S=< ]u  
 // TODO: add construction code here, LfrjC@_y  
 // Place all significant initialization in InitInstance w U]8hkl?  
} 8zeD%Uv  
V#1v5mWVx  
CHookApp theApp; LM"b%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j _E(h.  
{ N/0Q`cQ-  
 BOOL bProcessed=FALSE; KVoi>?a   
 if(HC_ACTION==nCode) )i39'0a  
 { <;+QK=f  
  if((lParam&0xc0000000)==0xc0000000){// Key up Lrx"Hn{  
   switch(wParam) RM2feWm  
   { 3!*` hQ;s  
    case VK_MENU: zhRF>Y`  
     MaskBits&=~ALTBIT; EG=U](8T  
     break; },5LrX`L  
    case VK_CONTROL: [A!=Hv_$  
     MaskBits&=~CTRLBIT; H lFVc  
     break; {![E)~  
    case VK_SHIFT: XxB%  
     MaskBits&=~SHIFTBIT; |QH )A  
     break; z}VCiS0  
    default: //judge the key and send message [)[?FG9   
     break; +C`vO5\0  
   } {iLr$ 89  
   for(int index=0;index<MAX_KEY;index++){ \FO 4A  
    if(hCallWnd[index]==NULL) }?GeU Xhy  
     continue; 2qj0iRH#N<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 0j#$Swa  
    { xr)m8H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 'HvW&~i(  
     bProcessed=TRUE; HwMe^e;  
    } |])Ko08*tE  
   } 7V\M)r{q7  
  } mp]UUpt  
  else if((lParam&0xc000ffff)==1){ //Key down #eI` l`}  
   switch(wParam) +(q r{G?  
   { -Xgup,}?  
    case VK_MENU: 6l>016 x  
     MaskBits|=ALTBIT; aJNsJIY+  
     break; ).C>>1ZC  
    case VK_CONTROL: E&W4`{6K4  
     MaskBits|=CTRLBIT; .W-=VzWX  
     break; OHF:E44k  
    case VK_SHIFT: 79lG~BGE  
     MaskBits|=SHIFTBIT; Me,AE^pgL'  
     break; /8(t:  
    default: //judge the key and send message IP 1{gMG  
     break; Ce3  
   } !.{{QwZ  
   for(int index=0;index<MAX_KEY;index++) i6h0_q8 >  
   { CBx5:}t  
    if(hCallWnd[index]==NULL) w$I$xup  
     continue; ~Oj-W6-+&,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +qF,XJ2  
    { 9VTE?,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ==7=1QfP  
     bProcessed=TRUE; 8\Z/mU*4  
    } O~#OVFJ9=  
   } 5Ul=Nv]  
  } dI8y}EbE~  
  if(!bProcessed){ f9E.X\"  
   for(int index=0;index<MAX_KEY;index++){ bzMs\rj\  
    if(hCallWnd[index]==NULL) "l09Ae'V  
     continue; w+ibY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) YC~kq?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); kmL~H1qd  
   } +Mh9Jf  
  } Tq.%_/@M<  
 } u"r1RG'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); b{JxTT}03  
} Sh5SOYLz  
laFF/g;sRC  
BOOL InitHotkey() h|=&a0  
{ {I_I$x_  
 if(hHook!=NULL){ m`ab5<%Gn  
  nHookCount++; [+$o`0q;N?  
  return TRUE; Rh#TR"  
 } EabZ7zFoN  
 else ~rU{Q>c  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (svd~he2  
  if(hHook!=NULL) Os7 3u#!'  
   nHookCount++; Mj@ 0F 2hy  
  return (hHook!=NULL); J $<g" z3  
} _\xd]~ELj  
BOOL UnInit() xSHeP`P^X  
{ [R[Suf  
 if(nHookCount>1){ F{aM6I  
  nHookCount--; vV9q5Bj:  
  return TRUE; YVLaO*( f  
 } ?_c*(2i&^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); t[L'}ig!q  
 if(unhooked==TRUE){ wq&TU'O  
  nHookCount=0; KEj-y+  
  hHook=NULL; Z)zmT%t  
 } [HhdeLOX  
 return unhooked; U~8 oE_+  
} 7[ra#>e8'  
S}*%l)vfR  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @=[ SsS  
{ )TcW.d6  
 BOOL bAdded=FALSE; $r=Ud >  
 for(int index=0;index<MAX_KEY;index++){ ` 5Qo*qx  
  if(hCallWnd[index]==0){ Q:B:  
   hCallWnd[index]=hWnd; @v,qfT*k7  
   HotKey[index]=cKey; MoP 0qNk  
   HotKeyMask[index]=cMask; M9b_Q  
   bAdded=TRUE; :3Z"Qk$uR  
   KeyCount++; fOyLBixR  
   break; m<;&B   
  } sf5koe  
 } az]S&\i7T  
 return bAdded; ='cr@[~i  
} 4RqOg1  
DNaU mz  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7L:$Amb_F  
{ ;-d :!*  
 BOOL bRemoved=FALSE; M -df Gk  
 for(int index=0;index<MAX_KEY;index++){ i'%:z]hp9  
  if(hCallWnd[index]==hWnd){ q|%(47}z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^\<1Y''  
    hCallWnd[index]=NULL; xe6 2gaT  
    HotKey[index]=0; n300kpv  
    HotKeyMask[index]=0; nNFZ77lg  
    bRemoved=TRUE; =kvYE,,g_  
    KeyCount--; WVf>>E^1  
    break; ~l@SGHx  
   } AjZ@hid  
  } JtU/%s  
 } ^kMgjS}R  
 return bRemoved; F+S;u=CKx  
} i-E~ZfJ  
9c1n  
void VerifyWindow() DPNUm<>  
{ XoaBX2  
 for(int i=0;i<MAX_KEY;i++){ f&Bu_r  
  if(hCallWnd!=NULL){ of ^N4  
   if(!IsWindow(hCallWnd)){ ; . c]0  
    hCallWnd=NULL; Hdh'!|w  
    HotKey=0; jn#  
    HotKeyMask=0; <5~} !N X`  
    KeyCount--; Ee##:I[z  
   } X] /r'Tz  
  } s Hu~;)  
 } 4PEJ}B W  
} 7oDr`=q1]r  
e}e\*BL  
BOOL CHookApp::InitInstance() xF_ Y7rw1w  
{ -)aBS3  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); :r[`bqC;\*  
 hins=AfxGetInstanceHandle(); *~|xj,md  
 InitHotkey(); QP?Z+P<  
 return CWinApp::InitInstance(); ![iAALPNl  
} Ng,#d`Br  
9frS!AQ  
int CHookApp::ExitInstance() AtA}OY]D /  
{ lV^sVN Z]  
 VerifyWindow(); xgtdmv%  
 UnInit(); 8_ns^6XK5p  
 return CWinApp::ExitInstance(); 52>?l C  
} kG+CT  
Q<r O5 -K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b#.hw2?a`  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) g0^%X9s  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~'HwNzDQc  
#if _MSC_VER > 1000 M*E4:A9_M  
#pragma once ZSMOq4Y 9  
#endif // _MSC_VER > 1000 %u43Pj  
>"S'R9t  
class CCaptureDlg : public CDialog `{/z\  
{ fdN-Zq@'  
 // Construction HT5G HkT  
 public: ])a?ri  
  BOOL bTray; ]RQQg,|D  
  BOOL bRegistered; A[ZJS   
  BOOL RegisterHotkey(); _#e='~;  
  UCHAR cKey; bI=\n)sEz  
  UCHAR cMask; z1F[okLA  
  void DeleteIcon(); S~ }?6/G.  
  void AddIcon(); &S<tX]v  
  UINT nCount; Vrf` :%  
  void SaveBmp(); >0i?}  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor /H,!7!6>?  
  // Dialog Data j+J)S1  
  //{{AFX_DATA(CCaptureDlg) z_< 7T4  
  enum { IDD = IDD_CAPTURE_DIALOG }; p/'C v  
  CComboBox m_Key; w=3@IW  
  BOOL m_bControl; \p.Byso,  
  BOOL m_bAlt; '\ dFhYs{*  
  BOOL m_bShift; NJ 7N*   
  CString m_Path; ^gh/$my;  
  CString m_Number; 2[Q*?N  
  //}}AFX_DATA wI}5[m  
  // ClassWizard generated virtual function overrides E'&UWD h  
  //{{AFX_VIRTUAL(CCaptureDlg) 'e\m6~u\hm  
 public: 3U@ p  
  virtual BOOL PreTranslateMessage(MSG* pMsg); oWo"` "P  
 protected: xue-5 '  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lb&tAl"D  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ?U2ed)zzw  
  //}}AFX_VIRTUAL }jfU qqFd  
  // Implementation MlsF?"H p  
 protected: 9 YU7R)  
  HICON m_hIcon; ^,b*.6t  
  // Generated message map functions T8ZBQ;o  
  //{{AFX_MSG(CCaptureDlg) FymA_Eq  
  virtual BOOL OnInitDialog(); OgS6#X  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); qw0tw2|  
  afx_msg void OnPaint(); z(>{"t<C  
  afx_msg HCURSOR OnQueryDragIcon(); #v')iR"  
  virtual void OnCancel(); {`KgyC W:  
  afx_msg void OnAbout(); pR&cdO RsP  
  afx_msg void OnBrowse(); 3. Qf^p  
  afx_msg void OnChange(); ~7b '4\  
 //}}AFX_MSG }` Q'!_`  
 DECLARE_MESSAGE_MAP() d^Ra1@0"q2  
};  #d*mG =  
#endif KcfW+> W3  
@|%t<{y^I  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file naXo < B  
#include "stdafx.h" DhY9)>4M  
#include "Capture.h" av gGz8  
#include "CaptureDlg.h" Rmn|"ZK  
#include <windowsx.h> X!CLOHVA a  
#pragma comment(lib,"hook.lib") >;HbD p  
#ifdef _DEBUG b UAjt>+  
#define new DEBUG_NEW LlRvm/  
#undef THIS_FILE jY:(Tv3~  
static char THIS_FILE[] = __FILE__; ?qw&H /R  
#endif u|WX?@\  
#define IDM_SHELL WM_USER+1 &EmxSYL>  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %zd1\We  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7l7eUy/z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; vf~q%+UqK  
class CAboutDlg : public CDialog RXt`y62yK  
{ } ~=53$+  
 public: \Q*3/_}G  
  CAboutDlg(); f&ZxG,]H i  
  // Dialog Data >('L2]4\v  
  //{{AFX_DATA(CAboutDlg) X5qU>'?`  
  enum { IDD = IDD_ABOUTBOX }; wv ,F>5P  
  //}}AFX_DATA A T+|}B!  
  // ClassWizard generated virtual function overrides ZGzrh`j{-  
  //{{AFX_VIRTUAL(CAboutDlg) .pi#Z /v  
 protected: ;#3!ZB:}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U v[:Aj  
  //}}AFX_VIRTUAL 23pHB |X  
  // Implementation 1b;Aru~l  
 protected: e1}h|HL j  
  //{{AFX_MSG(CAboutDlg) f>waF u-  
  //}}AFX_MSG )+oDa{dZ  
  DECLARE_MESSAGE_MAP() ?O\n!c  
}; 6VQ*z8wLw  
27t:-O  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) z.]t_`KuF9  
{ HG=!#-$9  
 //{{AFX_DATA_INIT(CAboutDlg) VV?+q)  
 //}}AFX_DATA_INIT ;{q7rsE  
} \0(QO8.  
mV`Z]-$$i  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) # u^FB  
{ *ta|,  
 CDialog::DoDataExchange(pDX); sTeL4g|%{  
 //{{AFX_DATA_MAP(CAboutDlg) cm-cwPAh  
 //}}AFX_DATA_MAP Si6%6rAhj  
} -Qiay/tlu  
kd|@.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) xlgN}M  
 //{{AFX_MSG_MAP(CAboutDlg) &{x5 |$SD  
 // No message handlers #?!)-Q%  
 //}}AFX_MSG_MAP x~j%  
END_MESSAGE_MAP() \P}~ICZA  
vsqfvx  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) "]*0)h_  
: CDialog(CCaptureDlg::IDD, pParent) S=krF yFw  
{ exTpy  
 //{{AFX_DATA_INIT(CCaptureDlg) eO (VSjo'`  
  m_bControl = FALSE; @5acTY Q  
  m_bAlt = FALSE; 9!_`HE+(XJ  
  m_bShift = FALSE; sA3 4`ZAa  
  m_Path = _T("c:\\"); '"~|L>F%G  
  m_Number = _T("0 picture captured."); hP`3Ao  
  nCount=0;  7I^(v Q  
  bRegistered=FALSE; G5"UhnOD'  
  bTray=FALSE; %OfaBv&  
 //}}AFX_DATA_INIT w;}P<K  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ztgSd8GGE  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); yew9bn0a=  
} B\KvKT|\  
, YTuZS  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) `Kpn@Xg  
{ Sw%=/g  
 CDialog::DoDataExchange(pDX); SL pd~ZC?  
 //{{AFX_DATA_MAP(CCaptureDlg) *;Hvx32I  
  DDX_Control(pDX, IDC_KEY, m_Key); vs7Hg )F  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <3O>  
  DDX_Check(pDX, IDC_ALT, m_bAlt); mJ#u]tiL  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 4 FGcCE3  
  DDX_Text(pDX, IDC_PATH, m_Path); %$`pD I)  
  DDX_Text(pDX, IDC_NUMBER, m_Number); I Zi1N  
 //}}AFX_DATA_MAP y*vs}G'W  
} 2o6KVQ  
^Ml)g=Fq  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ;5PXPpJ  
//{{AFX_MSG_MAP(CCaptureDlg) ::9U5E;!  
 ON_WM_SYSCOMMAND() +QtK "5M  
 ON_WM_PAINT() ojT TYR{  
 ON_WM_QUERYDRAGICON() G9N6iKP!  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) o" &7$pAh  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) XlV#)JX  
 ON_BN_CLICKED(ID_CHANGE, OnChange) lDCoYX_  
//}}AFX_MSG_MAP ,l&Dt,  
END_MESSAGE_MAP() hG uRV|`  
flVQG@  
BOOL CCaptureDlg::OnInitDialog() p#qQGJe  
{ #=OKY@z/  
 CDialog::OnInitDialog(); :nC Gqg  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); xl5mI~n_~  
 ASSERT(IDM_ABOUTBOX < 0xF000); +]Po!bN@@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); CS:j->  
 if (pSysMenu != NULL) k9 .@S  
 { vCFMO3  
  CString strAboutMenu; ^UEI`_HO0  
  strAboutMenu.LoadString(IDS_ABOUTBOX); t}c ymX~  
  if (!strAboutMenu.IsEmpty()) BCJo/m  
  { QuT8(s1Q!  
   pSysMenu->AppendMenu(MF_SEPARATOR); kHo0I8  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )_,*2|b  
  } Nm\0>}  
 } =Qsh3b&<P  
 SetIcon(m_hIcon, TRUE); // Set big icon vfK^^S  
 SetIcon(m_hIcon, FALSE); // Set small icon g"`BNI]Qp  
 m_Key.SetCurSel(0); $!G7u<`na  
 RegisterHotkey(); i`z1if6O  
 CMenu* pMenu=GetSystemMenu(FALSE); ?y>P  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); vYKKv%LE  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Urm&4&y  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); + Hc[5WL  
 return TRUE; // return TRUE unless you set the focus to a control A Ns.`S  
} z{]$WVs:^  
CJ8XKy  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #@w8wCj  
{ }cn46 L%/  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) `J'xVq#O  
 { *l)_&p  
  CAboutDlg dlgAbout; *Cz>r}W  
  dlgAbout.DoModal(); /a [i:Oa#  
 } blpX_N  
 else r? nvJHP  
 { @mSdksB/L  
  CDialog::OnSysCommand(nID, lParam); :"5i/Cx  
 } n!2"pRIi  
} 3%bCv_6B  
)M<"YI)g  
void CCaptureDlg::OnPaint() f7Y0L8D  
{ ZgP=maQk  
 if (IsIconic()) s )POtJ<  
 { + 0{m(%i  
  CPaintDC dc(this); // device context for painting  "_eHK#)  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); E/v.+m  
  // Center icon in client rectangle <4ccTl  
  int cxIcon = GetSystemMetrics(SM_CXICON); ` .|JTm[  
  int cyIcon = GetSystemMetrics(SM_CYICON); ]>tYU   
  CRect rect; 0M7Or)qN  
  GetClientRect(&rect); $5yH(Z[[  
  int x = (rect.Width() - cxIcon + 1) / 2; ",!#7h  
  int y = (rect.Height() - cyIcon + 1) / 2; '- oS=OrZ  
  // Draw the icon :.e`w#$7  
  dc.DrawIcon(x, y, m_hIcon); |]1-ck!  
 } ]P;uQ!  
 else |_"JyGR2  
 { >v7fR<(%s  
  CDialog::OnPaint(); 5^<X:1J$  
 } Hbu8gqu  
} m2F2  
2&MIt(\-  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,m;S-Im_Xr  
{ Jr$,w7tQn@  
 return (HCURSOR) m_hIcon; PIR#M('  
} VG0Ty;bV  
O-J;iX}  
void CCaptureDlg::OnCancel() ~b}a|K  
{ 0{^@kxV  
 if(bTray) |5oK04<  
  DeleteIcon(); Px{Cvc  
  CDialog::OnCancel(); e/Wrm^]y  
} H .*:+  
f!%G{G^`  
void CCaptureDlg::OnAbout() AFE6@/'  
{ F0:|uC4  
 CAboutDlg dlg; m?'H 7cFR  
 dlg.DoModal(); ,n<t':-  
} 'n4Ro|kA  
'w3BSaJi  
void CCaptureDlg::OnBrowse() TUHm.!+a  
{ h sG~xRA\  
 CString str; O#LG$Y n*  
 BROWSEINFO bi; pRWEBd1U  
 char name[MAX_PATH]; $mdmuUIy-3  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); R[KF${X4  
 bi.hwndOwner=GetSafeHwnd(); zmH8^:-x  
 bi.pszDisplayName=name;  ?QxI2J  
 bi.lpszTitle="Select folder"; cq lA"Eof  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; G&=4@pLY5  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ,)/gy)~#  
 if(idl==NULL) (3cJ8o>&  
  return; hgIqr^N9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H'KCIqo  
 str.ReleaseBuffer(); %LyZaU_sB  
 m_Path=str; O AJGwm  
 if(str.GetAt(str.GetLength()-1)!='\\') rQmDpoy=  
  m_Path+="\\"; Y-!~x0-H  
 UpdateData(FALSE); KYE)#<V}@  
} 1 aWzd[i  
_gU:!:}  
void CCaptureDlg::SaveBmp() 8Na.H::cZ  
{ <;Q1u,Mc  
 CDC dc; @Wgd(Ezd  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Lzmdy0!'  
 CBitmap bm; H#H@AY3Y  
 int Width=GetSystemMetrics(SM_CXSCREEN); ,LI$=lJ@  
 int Height=GetSystemMetrics(SM_CYSCREEN); Z|3 fhaT  
 bm.CreateCompatibleBitmap(&dc,Width,Height); (-S<9u-r  
 CDC tdc; mm}y/dO~}  
 tdc.CreateCompatibleDC(&dc); be?>C 5  
 CBitmap*pOld=tdc.SelectObject(&bm); NSe H u k  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); qt_ocOr  
 tdc.SelectObject(pOld); UWU(6J|Fk  
 BITMAP btm; q4u,pm,@  
 bm.GetBitmap(&btm); m=Mb'<  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (V&5EO8)  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); y7CC5S ?  
 BITMAPINFOHEADER bih; 5k:SD7^b  
 bih.biBitCount=btm.bmBitsPixel; CD^C}MB  
 bih.biClrImportant=0; YcQ$nZAU  
 bih.biClrUsed=0; \^o8qw'pt  
 bih.biCompression=0; TF]bmM})0  
 bih.biHeight=btm.bmHeight; *JnY0xP  
 bih.biPlanes=1; J?6.yL;  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7Qdf#DG  
 bih.biSizeImage=size; U ?iw  
 bih.biWidth=btm.bmWidth; #jrtsv]  
 bih.biXPelsPerMeter=0; ->Z9j(JU  
 bih.biYPelsPerMeter=0; 1Vf?Rw  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); v C23  
 static int filecount=0; HQp\0NC]  
 CString name; r ^=rs!f@  
 name.Format("pict%04d.bmp",filecount++); EPEWyGw  
 name=m_Path+name; 8y:/!rRN  
 BITMAPFILEHEADER bfh; ;x<5F+b  
 bfh.bfReserved1=bfh.bfReserved2=0; j1zrjhXI  
 bfh.bfType=((WORD)('M'<< 8)|'B'); jY;T:C-T  
 bfh.bfSize=54+size; Wd`*<+t]  
 bfh.bfOffBits=54; ^aG$9N<\  
 CFile bf; e p jb  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 7eNLs  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); mM9aT0_w  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o*MiKgQ&  
  bf.WriteHuge(lpData,size); Xr:gm`[  
  bf.Close(); 6ZO6 O=KD  
  nCount++; #ovausK[7  
 } 7MWd(n-  
 GlobalFreePtr(lpData); J.E Bt3  
 if(nCount==1) G]]"J c  
  m_Number.Format("%d picture captured.",nCount); n!aA<  
 else P"(VRc6x  
  m_Number.Format("%d pictures captured.",nCount); 45.<eWH$*(  
  UpdateData(FALSE); 1NAGGr00  
} Fqt,VED  
jJY{np  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w"`Zf7a{/  
{ Bd'X~Vj<  
 if(pMsg -> message == WM_KEYDOWN) ?"F9~vx&G  
 { ol0i^d*9F  
  if(pMsg -> wParam == VK_ESCAPE) 1Clid\T,o  
   return TRUE; /^]/ iTg  
  if(pMsg -> wParam == VK_RETURN) Ux,?\Vd  
   return TRUE; sYEh>%mo^C  
 } 8Y]% S9.  
 return CDialog::PreTranslateMessage(pMsg); qX[{_$^Q  
} Y/x>wNW  
6i+<0b}!/  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ~dO+kD  
{ gt(^9t;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Pz^C3h$5_  
  SaveBmp(); [vGkr" =  
  return FALSE; O~Jm<  
} u^O!5 'D%  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ X-=4Z9  
 CMenu pop; 3F?7oMNIh  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 0BwxPD#6bv  
 CMenu*pMenu=pop.GetSubMenu(0); I4|LD/b  
 pMenu->SetDefaultItem(ID_EXITICON); jn 5v  
 CPoint pt; aD(3.=[R  
 GetCursorPos(&pt); KuRJo]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); /78zs-  
 if(id==ID_EXITICON) ;J@U){R  
  DeleteIcon(); oVTXn=cYDp  
 else if(id==ID_EXIT) E^iShe  
  OnCancel(); C'y4 ~7  
 return FALSE; `fuQ t4  
} s=e`}4  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _Sg"|g  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) gSa!zQN6  
 AddIcon(); {/FdrS  
 return res; D6dliU?k  
} Z2U6<4?1%  
(@1>G ^%  
void CCaptureDlg::AddIcon() CnpQdI  
{ fsl ZJE  
 NOTIFYICONDATA data; ~.tl7wKkR/  
 data.cbSize=sizeof(NOTIFYICONDATA); \.aKxj5  
 CString tip; ur:8`+" (  
 tip.LoadString(IDS_ICONTIP); _l"=#i@L  
 data.hIcon=GetIcon(0); vM@8&,;  
 data.hWnd=GetSafeHwnd(); vX7U|zy  
 strcpy(data.szTip,tip); ?n]adS{  
 data.uCallbackMessage=IDM_SHELL; J-|&[-Z  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 4@+']vN4  
 data.uID=98; v.&c1hKHb  
 Shell_NotifyIcon(NIM_ADD,&data); dB)-qL8,2  
 ShowWindow(SW_HIDE); #bJp)&LO  
 bTray=TRUE; .=)[S5.BVq  
} abAw#XQ8  
RWRqu }a  
void CCaptureDlg::DeleteIcon() sf0\#Q  
{ VKtlAfXy~  
 NOTIFYICONDATA data; b^STegz  
 data.cbSize=sizeof(NOTIFYICONDATA); <PFF\NE9  
 data.hWnd=GetSafeHwnd(); N%,zME  
 data.uID=98; ~ _hA{$  
 Shell_NotifyIcon(NIM_DELETE,&data); 8(Q|[  
 ShowWindow(SW_SHOW); [_KV;qS%/  
 SetForegroundWindow(); Gshy$'_e  
 ShowWindow(SW_SHOWNORMAL); EJP]E)  
 bTray=FALSE; '6kD6o_p1  
} Rt5,/Q0  
i)]f0F  
void CCaptureDlg::OnChange() 1:iB1TclP  
{ *8J 0yv  
 RegisterHotkey(); y^e3Gyk  
} ]%ewxF  
 @M OaXe  
BOOL CCaptureDlg::RegisterHotkey() 0~z`>#W,  
{ 6g\hQ\+Z}  
 UpdateData(); $|g ;  
 UCHAR mask=0; HOx+umjxW  
 UCHAR key=0; .p]r S =#  
 if(m_bControl) Dpwqg3,  
  mask|=4; #K`0b$  
 if(m_bAlt) fLpWTkr0  
  mask|=2; ek.@ 0c  
 if(m_bShift) rq^%)tR  
  mask|=1; =k*XGbU  
  key=Key_Table[m_Key.GetCurSel()]; mr2Mu  
 if(bRegistered){ k+%&dEE|vH  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?(U a+*b  
  bRegistered=FALSE; '7pzw>E=:  
 } RH:vd|q+  
 cMask=mask; <@# g2b  
 cKey=key; Y]=k"]:%  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "hQGk  
 return bRegistered; cRMyYdJ o  
} : h(Z\D_  
gkX7,J-0  
  四、小结 0VrsbkS  
{n&n^`Em  
  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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