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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: $Yka\tS'  
  pIXQ/(h31  
  一、实现方法 ox6rR  
Nm~#$orI|  
  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: u *< (B  
?Y9?x,x  
#pragma data_seg("shareddata") QKO(8D6+  
HHOOK hHook =NULL; //钩子句柄 I%Awj(9BS  
UINT nHookCount =0; //挂接的程序数目 qha<.Ro  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 H,}?YW  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 wB^a1=C  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey PjHm#a3zg%  
static int KeyCount =0; e#('`vGB  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 { \ePJG#  
#pragma data_seg() 4Bn+L,}.  
*.RVH<W=8  
  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。 UXP;'  
2KEww3.{  
  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: - \QtE}|4  
OK 6}9Eu9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR pr"flRQr#  
cKey,UCHAR cMask) El%(je,|  
{ -}J8|gwwp  
 BOOL bAdded=FALSE; F\I^d]#,[  
 for(int index=0;index<MAX_KEY;index++){ CmTJa5:  
  if(hCallWnd[index]==0){ =N c`hP  
   hCallWnd[index]=hWnd; ;vitg"Zh>  
   HotKey[index]=cKey; ~iWSc8-  
   HotKeyMask[index]=cMask; 93\,m+-  
   bAdded=TRUE; >MT)=4 9q  
   KeyCount++; g6V*wjC  
   break; <G >PPf}  
  } N[-)c,O  
 } m%&B4E#3T  
 return bAdded; bhmjH(.t  
} <c#[.{A}s  
//删除热键 zCrcCr  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) YO,ldsSz|r  
{ W}RR_Gu  
 BOOL bRemoved=FALSE; *QG;KJ%  
 for(int index=0;index<MAX_KEY;index++){ s<b7/;w'  
  if(hCallWnd[index]==hWnd){ 6,PL zZ5  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3[0:,^a  
    hCallWnd[index]=NULL; Ei-OuDM;)  
    HotKey[index]=0; Q 1Ao65  
    HotKeyMask[index]=0; l&B'.6XKs  
    bRemoved=TRUE; ~}w 8UO  
    KeyCount--; H~Cfni;  
    break; ^= G+]$8  
   } 9x!y.gx  
  } %u}sVRJ  
 } vknFtpx  
 return bRemoved; BE~[%6T7  
} `vw.~OBl  
;[9Is\  
4lCm(#T{,  
  DLL中的钩子函数如下: b G)MG0<TT  
}b`*%141  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |xm|Q(PG  
{ =&b[V"  
 BOOL bProcessed=FALSE; #4M0%rN  
 if(HC_ACTION==nCode) &/9oi_r%r  
 { t^hkGYj!2  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 SfUUo9R(sm  
   switch(wParam) 3iw9jhK!W  
   {  j&.BbcE45  
    case VK_MENU: >gJWp@6V  
     MaskBits&=~ALTBIT; z7C1&bGe  
     break; =*jcO119L  
    case VK_CONTROL: x3 |'jmg  
     MaskBits&=~CTRLBIT; DlI5} Jh  
     break; mI#; pO2  
    case VK_SHIFT: @g~sgE}#  
     MaskBits&=~SHIFTBIT; aehMLl9cl  
     break; `'WLGQG  
    default: //judge the key and send message Kf#!IY][  
     break; 5eA]7$ic  
   } m12 B:f  
   for(int index=0;index<MAX_KEY;index++){ wjOAgOC  
    if(hCallWnd[index]==NULL) S!_?# ^t  
     continue; ]?{lQ0vw'w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) AHJ;>"]  
    { 6^;!9$G|D*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); lvi:I+VgA  
     bProcessed=TRUE; J B@VP{  
    } W?-BT >#s  
   } "M^W:4_  
  } DT4RodE$  
  else if((lParam&0xc000ffff)==1){ //有键按下 uszSFe]E  
   switch(wParam) )AXH^&  
   { }3w b*,Sbz  
    case VK_MENU: VhgEG(Ud  
     MaskBits|=ALTBIT; WmUW i{  
     break; A#&qoZ(C  
    case VK_CONTROL: Ir #V2]$  
     MaskBits|=CTRLBIT; zD<9A6AB  
     break; `g N68:B  
    case VK_SHIFT: "b4iOp&:=  
     MaskBits|=SHIFTBIT; (L%q/$  
     break; u V7Hsg9l  
    default: //judge the key and send message tYZGf xj  
     break; <9a_wGs  
   } @l GnG  
   for(int index=0;index<MAX_KEY;index++){ XWpnZFjE  
    if(hCallWnd[index]==NULL) ^1=|(Z/  
     continue; +Q31K7Gr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pIiED9  
    { +z0}{,HX  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); : "te-  
     bProcessed=TRUE; 9PK-r;2  
    } \/'n[3x  
   } 5C1Rub)  
  } v qMk)htIz  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 5KE%@,k k  
   for(int index=0;index<MAX_KEY;index++){ Ml?)Sc"\7  
    if(hCallWnd[index]==NULL) PRC)GP&q  
     continue; /? 1Yf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) L^1q/4${  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); z.&% >%TPP  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 N09+idg  
   } Mk/!,N<h#  
  } h./vTNMc  
 } ^jjJM|a  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); E :=KH\2f  
} )+4}Ix/q  
O)%kl  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: [.xk  
cjC6\.+l3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oV>AFs6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zy6(S_j  
wn|@D<  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: ^@L l(?  
I7z/GA\x  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J?quYlS  
{ cN}A rv  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) jI`To%^ Y  
 { Kx 185Q'W  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 0nq}SH  
  SaveBmp(); p6Dv;@)Yn  
  return FALSE; wx%nTf/Oa  
 } ^@lg5d3F  
 …… //其它处理及默认处理 f\_!N "HW  
} [j]J_S9jJ  
ec4%Wk2  
]!G>8Rc  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 <`j[;>O  
2vdQ&H4  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 *a,.E6C*  
|4> r"  
  二、编程步骤 =#2qX> ?  
^}/ E~Sg7\  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; W$Q)aA7  
,9tbu!Pvq  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; :8Ts'OGwI  
eO PCYyN  
  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; k.xv+^b9Q  
j /dE6d  
  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; maUHjI 5A-  
}42qMOi#w1  
  5、 添加代码,编译运行程序。  vs])%l%t  
<Z:8~:@  
三、程序代码 pebx#}]p-  
-C-OG}XjI  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 9#T%bB "J  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ?V)C9@bp  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1;:t~Y  
#if _MSC_VER > 1000 nR@,ouB-$  
#pragma once +>:_kE]?nX  
#endif // _MSC_VER > 1000 `TD%M`a  
#ifndef __AFXWIN_H__ ?I2k6%a  
#error include 'stdafx.h' before including this file for PCH ?WQd  
#endif Fr3d#kVR  
#include "resource.h" // main symbols pG F5aF7T  
class CHookApp : public CWinApp CziaxJ  
{ x"l lX  
 public: g[wP!y%V  
  CHookApp(); *JY`.t  
  // Overrides O})u'  
  // ClassWizard generated virtual function overrides N~S[xS?  
  //{{AFX_VIRTUAL(CHookApp) 0I>?_?~l6  
 public: SeNF!k% Y  
  virtual BOOL InitInstance(); .W@4vrp@  
  virtual int ExitInstance(); K[LVT]3 n  
  //}}AFX_VIRTUAL q"LJwV}W  
  //{{AFX_MSG(CHookApp) y }&4HrT&  
  // NOTE - the ClassWizard will add and remove member functions here. s 9|a2/{  
  // DO NOT EDIT what you see in these blocks of generated code ! @Tfwh/UN  
  //}}AFX_MSG | 2.e0Z]k  
  DECLARE_MESSAGE_MAP() j`|^s}8t  
}; Ld}(*-1i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Fi?Q 4b  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N?=qEX|R  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?dKa;0\  
BOOL InitHotkey(); uO_,n  
BOOL UnInit(); FJd8s*  
#endif `b.o&t$L  
qaMZfA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 2c"N-c&A  
#include "stdafx.h" [Zt# c C+  
#include "hook.h" &J;H@d||  
#include <windowsx.h> Cb )=n6  
#ifdef _DEBUG hViprhC  
#define new DEBUG_NEW =|gJb|?w  
#undef THIS_FILE 3Zaq#uA  
static char THIS_FILE[] = __FILE__; ])QO%  
#endif jV4hxuc$  
#define MAX_KEY 100 VM!-I8t  
#define CTRLBIT 0x04 ~N{_N95!2@  
#define ALTBIT 0x02 uhTKCR~  
#define SHIFTBIT 0x01 ~.W=  
#pragma data_seg("shareddata") Wd^lt7(j  
HHOOK hHook =NULL; OC?Zw@  
UINT nHookCount =0; 18O@ 1M  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey '"xL}8HX}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT @[5_C?2  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey S_|9j{w)  
static int KeyCount =0; 2;%#C!TG;  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift  `CA G8D  
#pragma data_seg() y|e2j&m  
HINSTANCE hins; rb *C-NutE  
void VerifyWindow(); dXhCyr%"6  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @~$F;M=.*  
//{{AFX_MSG_MAP(CHookApp) c_ qcb7<~.  
// NOTE - the ClassWizard will add and remove mapping macros here. - - i&"  
// DO NOT EDIT what you see in these blocks of generated code! \'; t*  
//}}AFX_MSG_MAP |{7e#ww]  
END_MESSAGE_MAP() ^sT +5M^  
?#BZ `H  
CHookApp::CHookApp() JNxW6 cK  
{ 2AXF$YjY  
 // TODO: add construction code here, Th7wP:iDP  
 // Place all significant initialization in InitInstance ~+pg^en  
} H5AK n*'7  
[j:}=:feQ  
CHookApp theApp; ZRXI?Jr%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) MfXt+c`r  
{ ~A[YnJYA#  
 BOOL bProcessed=FALSE; 8/Et&TJ`  
 if(HC_ACTION==nCode) 9Qt)m fqM  
 { & %N(kyp  
  if((lParam&0xc0000000)==0xc0000000){// Key up Pn'`Q S?  
   switch(wParam) X"hOHx5P  
   { y3={NB+  
    case VK_MENU: `d}W;&c  
     MaskBits&=~ALTBIT; I"8d5a}  
     break; 6P%<[Z  
    case VK_CONTROL: 1-6gB@cvQ  
     MaskBits&=~CTRLBIT; ;f".'9 l^  
     break; }.fL$,7a  
    case VK_SHIFT: E/wQ+rv  
     MaskBits&=~SHIFTBIT; ,_.@l+BM.  
     break; 6C:x6'5[  
    default: //judge the key and send message kf+JM/  
     break; JdaFY+f :  
   } ee&nU(pK  
   for(int index=0;index<MAX_KEY;index++){ $xRo<,OV+  
    if(hCallWnd[index]==NULL) zQL!(2  
     continue; UfK4eZx*`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &Q'\WA'  
    { lQh E]m>+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =w',-+@  
     bProcessed=TRUE; I;Al? &uw  
    } \yih 1Om>~  
   } U9<_6Bsd  
  } /Y;+PAy  
  else if((lParam&0xc000ffff)==1){ //Key down (oLpnjJ(,  
   switch(wParam) n!UMU^  
   { 8`:M\*  
    case VK_MENU: #2Ac  
     MaskBits|=ALTBIT; H/^ ~<U#p  
     break; _, \y2&KT  
    case VK_CONTROL: (g%JK3  
     MaskBits|=CTRLBIT; <)_:NRjBF&  
     break; X!U]`Qh  
    case VK_SHIFT: 6PiEa(  
     MaskBits|=SHIFTBIT; -/M9 vS  
     break; 9Tzc(yCY  
    default: //judge the key and send message "NxOOLL  
     break; J*}VV9H  
   } i'Y-V]->  
   for(int index=0;index<MAX_KEY;index++) <8iYL`3  
   { g/OI|1a  
    if(hCallWnd[index]==NULL) NlA*\vco  
     continue; Z -pyFK\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Qe2m8  
    { tegOT]|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); !aQIh  
     bProcessed=TRUE; 8BHL  
    } nURvy}<r  
   } y!S^xS  
  } VKT@2HjNT`  
  if(!bProcessed){ V)2"l"Kt  
   for(int index=0;index<MAX_KEY;index++){ !c\7  
    if(hCallWnd[index]==NULL) D35m5+=I  
     continue; M]J[6EW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) v]66.-  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); '/Cg*o/  
   } (d54C(")  
  } HMF8;,<_w?  
 } =8O}t+U  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); zXQVUhL6  
} 3|q2rA  
86/.8  
BOOL InitHotkey() ''_,S,.a20  
{ 1pWk9Xuh  
 if(hHook!=NULL){ t G]N*%@  
  nHookCount++; d0'7efC+  
  return TRUE; HpW" lYW4  
 } ]9fS@SHdx  
 else F\;2 i:(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]AFj&CteZ/  
  if(hHook!=NULL) l &}piC  
   nHookCount++; ~GSpl24W<  
  return (hHook!=NULL); /CIx$G  
} SrSG{/{  
BOOL UnInit() y= 2=DU  
{ 5 RW@_%C  
 if(nHookCount>1){ s5Pq$<  
  nHookCount--; b([:,T7  
  return TRUE; +IvNyj|  
 } <sa #|Y$  
 BOOL unhooked = UnhookWindowsHookEx(hHook); yU*u  
 if(unhooked==TRUE){ JK[T]|G  
  nHookCount=0; YFG-U-t3  
  hHook=NULL; T]^?l  
 } N"S3N)wgd  
 return unhooked; J(4g4?  
} t5%TS:u  
9`&?hi49nK  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) S3ErH,XB.  
{ `a-Bji?  
 BOOL bAdded=FALSE; %z30=?VL  
 for(int index=0;index<MAX_KEY;index++){ ?vvG)nW  
  if(hCallWnd[index]==0){ ^Fn%K].X  
   hCallWnd[index]=hWnd; H4W1\u  
   HotKey[index]=cKey; Ih; aBS  
   HotKeyMask[index]=cMask; aUA cR W  
   bAdded=TRUE; D2{L=  
   KeyCount++; 2v4W6R  
   break; V)=Z6ti  
  } )W#T2Z>N1  
 } 18jJzYawh  
 return bAdded; S,XKW(5   
} z23#G>I&  
OH>r[,z0  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;"D~W#0-v  
{ >8%M*-=p  
 BOOL bRemoved=FALSE; Ha?G=X  
 for(int index=0;index<MAX_KEY;index++){ lHcA j{6  
  if(hCallWnd[index]==hWnd){ C(}^fJ6r  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ JT}.F!q6E  
    hCallWnd[index]=NULL; HV8I nodi  
    HotKey[index]=0; ?5`{7daot  
    HotKeyMask[index]=0; V- /YNRV  
    bRemoved=TRUE; AH|Y<\  
    KeyCount--; '|_/lz$h  
    break; MBlBMUJk  
   } Sg_O?.r  
  } 9YAM#LBTWi  
 } *-6?  
 return bRemoved; iM"asEU  
} v_.HGG S  
0JK2%%  
void VerifyWindow() @$oZ|ZkZ  
{ 0iF-}o  
 for(int i=0;i<MAX_KEY;i++){ ndqckT@93  
  if(hCallWnd!=NULL){ eIsT!V" 7  
   if(!IsWindow(hCallWnd)){ )Z("O[  
    hCallWnd=NULL; *<7l!#  
    HotKey=0; g@Ld"5$^2  
    HotKeyMask=0; &Bm&i.r  
    KeyCount--; 02(h={  
   } BGN9, ii  
  } G?R_aPP  
 } ,[Ag~.T  
} Oo1ecbY  
(#If1[L  
BOOL CHookApp::InitInstance() UoHd-  
{ {tc57jsr  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 0Q`&inwh  
 hins=AfxGetInstanceHandle(); PYu$1o9+N  
 InitHotkey(); a_MFQf&KV  
 return CWinApp::InitInstance(); drI\iae{^  
} h D.)M  
*,0+RASvq  
int CHookApp::ExitInstance() YtpRy% R  
{ 2[ksi51y  
 VerifyWindow(); zSKKr?{  
 UnInit(); =HS4I.@c_5  
 return CWinApp::ExitInstance(); \ADLMj`F|  
} L:pUvcAc?  
O>%$q8x@i  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file =DC 3a3&%  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~;8I5Sge  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ x}|+sS,g  
#if _MSC_VER > 1000 FfG%C>E6~  
#pragma once V 9Hl1\j^  
#endif // _MSC_VER > 1000 .;g}%C  
t3a#%'Dv  
class CCaptureDlg : public CDialog e^8BV;+c  
{ *7Xzht&f  
 // Construction z0 \N{rP&  
 public: gHZqA_*T8U  
  BOOL bTray; O:IQ!mzV5  
  BOOL bRegistered; AuXs B  
  BOOL RegisterHotkey(); jM@?<1  
  UCHAR cKey; V'I T1~  
  UCHAR cMask; z&F5mp@  
  void DeleteIcon(); +?Ez} BP  
  void AddIcon(); m8+:=0|$  
  UINT nCount; 8SZK:VE@  
  void SaveBmp(); [S0mY["  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor !D;c,{Oz  
  // Dialog Data 1x{kl01m%  
  //{{AFX_DATA(CCaptureDlg) _C$X04bU3V  
  enum { IDD = IDD_CAPTURE_DIALOG }; G,|KL" H6  
  CComboBox m_Key; #Kl}= 1 4  
  BOOL m_bControl; [,b)YjO~Xd  
  BOOL m_bAlt; QZ~0o7  
  BOOL m_bShift; iD714+N(  
  CString m_Path; G?ig1PB"#  
  CString m_Number; {m[Wyb(  
  //}}AFX_DATA n}q$f|4!  
  // ClassWizard generated virtual function overrides AG>\aV"b  
  //{{AFX_VIRTUAL(CCaptureDlg) o0mJy'  
 public: %K l(>{N  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /[{auUxSX  
 protected: i/*,N&^  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support )i-gs4[(QN  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Mq'IkSt'  
  //}}AFX_VIRTUAL vxVOcO9<  
  // Implementation 9go))&`PJL  
 protected: T?rH ,$:  
  HICON m_hIcon; > c:Zx!  
  // Generated message map functions #c:kCZt#  
  //{{AFX_MSG(CCaptureDlg) E-SG8U;  
  virtual BOOL OnInitDialog(); `tVy_/3(9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); UP8{5fx'  
  afx_msg void OnPaint(); U=QA  e  
  afx_msg HCURSOR OnQueryDragIcon(); ~},W8\C>  
  virtual void OnCancel(); Z0\Iyc G  
  afx_msg void OnAbout(); t^U^Tr  
  afx_msg void OnBrowse(); SiTeB)/  
  afx_msg void OnChange(); M1{(OY(G  
 //}}AFX_MSG niz'b]] +  
 DECLARE_MESSAGE_MAP() wE6A 7\k%  
}; 328L)BmW  
#endif V|: qow:F  
Z&Pu8zG /m  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lDN?|YG  
#include "stdafx.h" +`}o,z/^  
#include "Capture.h" N2FbrfNFa  
#include "CaptureDlg.h" ;s_"{f`Y6  
#include <windowsx.h> !8/gL  
#pragma comment(lib,"hook.lib") K<RqBecB  
#ifdef _DEBUG x0<^<D&Q  
#define new DEBUG_NEW 0T9. M(  
#undef THIS_FILE [.&[<!,.  
static char THIS_FILE[] = __FILE__; $.8 H>c  
#endif C:j]43`  
#define IDM_SHELL WM_USER+1 Yt{&rPv,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6t m \L  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); O{ q&]~,  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; vRr9%zx  
class CAboutDlg : public CDialog V3uXan_  
{ $[z<oN_Q  
 public: ?cK]C2Ak  
  CAboutDlg(); $5A^'q  
  // Dialog Data ,g|2NjUAc  
  //{{AFX_DATA(CAboutDlg) i}lRIXjdV  
  enum { IDD = IDD_ABOUTBOX }; >];"N{ A  
  //}}AFX_DATA R=$Ls6z  
  // ClassWizard generated virtual function overrides Qxq-Mpx{  
  //{{AFX_VIRTUAL(CAboutDlg) h<NRE0-  
 protected: <\aU"_D   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ;?~ 9hN!  
  //}}AFX_VIRTUAL '[ 0YIn  
  // Implementation Pa&4)OD  
 protected: u)~s4tP4  
  //{{AFX_MSG(CAboutDlg) 9rcI+q=E  
  //}}AFX_MSG Y[G9Vok VX  
  DECLARE_MESSAGE_MAP() 6fGK (r  
}; J?D\$u:  
1;&T^Gdj  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) nk/vGa4  
{ D=&K&6rr  
 //{{AFX_DATA_INIT(CAboutDlg) ?,XC =}  
 //}}AFX_DATA_INIT 9@y3IiZ"}  
} 6+PGwCS  
(h,Ws-O  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) <L&eh&4c  
{ u-.L^!k  
 CDialog::DoDataExchange(pDX); '[f Zt#  
 //{{AFX_DATA_MAP(CAboutDlg) hQ';{5IKvC  
 //}}AFX_DATA_MAP $E.XOpl&I  
}  SFpQ#  
~:Mm<*lL%  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) }N,>A-P  
 //{{AFX_MSG_MAP(CAboutDlg) ],&\%jd<  
 // No message handlers ])N%^Qe$U  
 //}}AFX_MSG_MAP % wL,v.}  
END_MESSAGE_MAP() . #U}q 7X  
0p3vE,pF  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) [hnK/4!  
: CDialog(CCaptureDlg::IDD, pParent) Ef,Cd[]b  
{ >FF1)~  
 //{{AFX_DATA_INIT(CCaptureDlg) 7zGMkl  
  m_bControl = FALSE; &yLc1#H  
  m_bAlt = FALSE; O?E6xc<8  
  m_bShift = FALSE; TSQh X~RN  
  m_Path = _T("c:\\"); H.~bD[gA  
  m_Number = _T("0 picture captured."); 3_zSp.E\l  
  nCount=0; D9o*8h2$  
  bRegistered=FALSE; qjLo&2)  
  bTray=FALSE; aQ|hi F}  
 //}}AFX_DATA_INIT ]>8)|]O6n  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 dtTlIhh1V  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ~6d5zI4\  
} plXG[1;&G  
jONjt(&N  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) c[5@ \j\  
{ K)5;2lN,  
 CDialog::DoDataExchange(pDX); fl)zQcA  
 //{{AFX_DATA_MAP(CCaptureDlg) d?7BxYaa  
  DDX_Control(pDX, IDC_KEY, m_Key); V(..8}LlD  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 6LM9e0oxy  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 9v~5qv;  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 8 u:2,l  
  DDX_Text(pDX, IDC_PATH, m_Path); 61:9(*4~!F  
  DDX_Text(pDX, IDC_NUMBER, m_Number); C3.=GRg~l  
 //}}AFX_DATA_MAP |Fp'/~|w2d  
} wd+O5Lr.R  
.bfST.OA  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) kl<g;3  
//{{AFX_MSG_MAP(CCaptureDlg) ) ,Npv3(  
 ON_WM_SYSCOMMAND() ?Aw3lH#:  
 ON_WM_PAINT() Qlh?iA  
 ON_WM_QUERYDRAGICON() J]\^QMX  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ^PQM;"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) os**hFPk;1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) O`(U/?   
//}}AFX_MSG_MAP o#}mkE87  
END_MESSAGE_MAP() \ V?I+Gc  
}Vl^EAR  
BOOL CCaptureDlg::OnInitDialog() V6*?$o  
{ cL7C 2wB`  
 CDialog::OnInitDialog(); gjZx8oIoP  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); u+z~  
 ASSERT(IDM_ABOUTBOX < 0xF000); =|V" #3$f  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e& Rb  
 if (pSysMenu != NULL) vgAFuQi(  
 { UABbcNW  
  CString strAboutMenu; #(dhBEXPW;  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Tf[dZ(+\  
  if (!strAboutMenu.IsEmpty()) f{_)rsqf  
  { tN!Bvj:C[M  
   pSysMenu->AppendMenu(MF_SEPARATOR); 3:AU:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); /7vE>mSY  
  } 0WXVc  
 } **HrWM%?8o  
 SetIcon(m_hIcon, TRUE); // Set big icon !NA`g7'  
 SetIcon(m_hIcon, FALSE); // Set small icon (&c,twa~  
 m_Key.SetCurSel(0); GNZ#q)qT  
 RegisterHotkey(); 7LdzZS0OM  
 CMenu* pMenu=GetSystemMenu(FALSE); H:MUNc8i  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); yHOqzq56  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); `^%@b SE(  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Tk](eQsy.v  
 return TRUE; // return TRUE unless you set the focus to a control PUKVn+h  
} A:)sg!Lt  
Z@oKz:U  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) BA*&N>a  
{ ;qb Dbg  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) y/\ZAtnLo  
 { %rXexy!V  
  CAboutDlg dlgAbout; ArX]L$ D  
  dlgAbout.DoModal(); yxY h?ka  
 } 'M-)Os "  
 else nX 8B;*p6b  
 { g]4y AV<2  
  CDialog::OnSysCommand(nID, lParam); M:(&n@e  
 } )f[C[Rd  
} rXDJ:NP  
@ExLh9  
void CCaptureDlg::OnPaint() zzE]M}s  
{ b"3uD`  
 if (IsIconic()) C *Xik9n  
 { vX 1W@s  
  CPaintDC dc(this); // device context for painting //tT8HX  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Z9f/-|r5  
  // Center icon in client rectangle <M305BH  
  int cxIcon = GetSystemMetrics(SM_CXICON); ogp{rY  
  int cyIcon = GetSystemMetrics(SM_CYICON); xD^wTtT  
  CRect rect; pJ6Jx(  
  GetClientRect(&rect); Rdj8 *f  
  int x = (rect.Width() - cxIcon + 1) / 2; )r#,ML  
  int y = (rect.Height() - cyIcon + 1) / 2; S*s:4uf  
  // Draw the icon J@gm@ jLc  
  dc.DrawIcon(x, y, m_hIcon); "u5KbJW  
 } PY\W  
 else T+(M8 qb  
 { +K&?)?/=  
  CDialog::OnPaint(); *?p ^6vO  
 } Cy6%S).c  
} wBE7Bv45  
^vG=|X|)c  
HCURSOR CCaptureDlg::OnQueryDragIcon() X&.:H~xS+  
{ Q-3r}jJe  
 return (HCURSOR) m_hIcon; ~f .y:Sbb  
} IqXBz.p  
Fr2kbQTg;  
void CCaptureDlg::OnCancel() W7$s5G,  
{ C$t.C rxx  
 if(bTray) uct=i1+ fE  
  DeleteIcon(); y]7%$* <  
  CDialog::OnCancel(); jQ)L pjS1  
} U Q)!|@&  
R~$hWu}}  
void CCaptureDlg::OnAbout() &M$Bt} <  
{ yYM_lobn  
 CAboutDlg dlg; r(]98a]o~  
 dlg.DoModal(); 2'Y{FY_Z  
} u?H@C)P  
C_-%*]*,j  
void CCaptureDlg::OnBrowse() drbe#FObX  
{ "A]?M<R  
 CString str; o:H'r7N  
 BROWSEINFO bi; "% SX@  
 char name[MAX_PATH]; 1z3]PA!R  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); x ~wNO/  
 bi.hwndOwner=GetSafeHwnd(); tg3zXJ4k_  
 bi.pszDisplayName=name; [z^Od  
 bi.lpszTitle="Select folder"; !ZX&r{pJp  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; eVrnVPkM  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )=y.^@UT@  
 if(idl==NULL) Q*Y 4m8wY  
  return; $.``OxJk%  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); [#IBYJ.6  
 str.ReleaseBuffer(); [;*\P\Xih  
 m_Path=str; 40R"^*  
 if(str.GetAt(str.GetLength()-1)!='\\') X=JFWzC  
  m_Path+="\\"; J0Jr BXCh  
 UpdateData(FALSE); k&yQ98H$K"  
} UmYD]  
1E8$% 6VV  
void CCaptureDlg::SaveBmp() d3og?{i<}&  
{ Gl.?U;4Z  
 CDC dc; ]9#CVv[rq  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1]Gf)|  
 CBitmap bm; o T:j:n  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1k$2LQ  
 int Height=GetSystemMetrics(SM_CYSCREEN); kp'b>&9r  
 bm.CreateCompatibleBitmap(&dc,Width,Height); J9NsHr:A[  
 CDC tdc; ' J2ewW5  
 tdc.CreateCompatibleDC(&dc); o1Ne+Jt  
 CBitmap*pOld=tdc.SelectObject(&bm); =[s8q2V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); UE\%e9<l  
 tdc.SelectObject(pOld); cT\O v P*_  
 BITMAP btm; K!9y+%01  
 bm.GetBitmap(&btm); U[IQ1AEr  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; E=}6 X9X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); vz- 9<w;>a  
 BITMAPINFOHEADER bih; +I*k0"gj6  
 bih.biBitCount=btm.bmBitsPixel; h] <GTWj  
 bih.biClrImportant=0; C?8PT/  
 bih.biClrUsed=0; I; ^xAd3G  
 bih.biCompression=0; ?Y%}(3y  
 bih.biHeight=btm.bmHeight; @<|6{N<  
 bih.biPlanes=1; LFl2uV"  
 bih.biSize=sizeof(BITMAPINFOHEADER); BQ).`f";d  
 bih.biSizeImage=size; :sU!PF[<  
 bih.biWidth=btm.bmWidth; d:A\<F  
 bih.biXPelsPerMeter=0; +d.u##$  
 bih.biYPelsPerMeter=0; _L8Mpx*E  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W&HF?w}s  
 static int filecount=0; uPI v/&HA  
 CString name; )t*S 'R  
 name.Format("pict%04d.bmp",filecount++); < }<#W/  
 name=m_Path+name; qi( &8in  
 BITMAPFILEHEADER bfh; 5BrU'NF  
 bfh.bfReserved1=bfh.bfReserved2=0; lq~Gc M  
 bfh.bfType=((WORD)('M'<< 8)|'B'); B.V?s,U  
 bfh.bfSize=54+size; t-'I`I  
 bfh.bfOffBits=54; ,NjX&A@  
 CFile bf; :x8Jy4L  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ =g/4{IL%  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); :8](&B68gE  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @m5O{[euj<  
  bf.WriteHuge(lpData,size); 8FAT(f//.  
  bf.Close(); ^!q 08`0  
  nCount++; eVJ= .?r  
 } NKRaQ r  
 GlobalFreePtr(lpData); c'"#q)  
 if(nCount==1) -FQC9~rR;g  
  m_Number.Format("%d picture captured.",nCount); s4x'f$r  
 else p^T&jE8])#  
  m_Number.Format("%d pictures captured.",nCount); eLCdAr  
  UpdateData(FALSE); ll^Th >  
} 3X,]=f@_  
vEu Ka<5  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) xylpiSJ  
{ [Bl $IfU  
 if(pMsg -> message == WM_KEYDOWN) f+*J ue  
 { 7bctx_W&6  
  if(pMsg -> wParam == VK_ESCAPE) x*NqA( r  
   return TRUE; ,lrYl!,  
  if(pMsg -> wParam == VK_RETURN) Tm (Q@  
   return TRUE; _Syre6k  
 } K%98;e9  
 return CDialog::PreTranslateMessage(pMsg); pGO|~:E/L  
} `6 |i&w:b  
|E46vup  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]ev*m&O  
{ D-'i G%)kA  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ev~dsk6k  
  SaveBmp(); m"96:v  
  return FALSE; Ll008.#  
} r~8D\_=s  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ q >Q:X3  
 CMenu pop; k\sc }z8X  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); H+S~ bzz  
 CMenu*pMenu=pop.GetSubMenu(0); l[tY,Y:4qO  
 pMenu->SetDefaultItem(ID_EXITICON); Dm7Y#)%8  
 CPoint pt; 5LDQ^n  
 GetCursorPos(&pt); it(LphB8  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); %4?SY82  
 if(id==ID_EXITICON) ZC3tbhV  
  DeleteIcon(); <m?GJuQ'  
 else if(id==ID_EXIT) *LY~l  
  OnCancel(); L!CX &  
 return FALSE; hB|H9+  
} (%``EIc<8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _<Hb(z  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Xjs21-t%  
 AddIcon(); + AE&GU  
 return res; )2iM<-uB  
} X=rc3~}f  
'"!z$i~G=  
void CCaptureDlg::AddIcon() `,F&y{ A  
{ u5xU)l3  
 NOTIFYICONDATA data; >wz;}9v  
 data.cbSize=sizeof(NOTIFYICONDATA); y #hga5  
 CString tip; <;2P._oZ  
 tip.LoadString(IDS_ICONTIP); 7P3 <o!YA  
 data.hIcon=GetIcon(0); KzEuPJ?  
 data.hWnd=GetSafeHwnd(); >2l13^Y  
 strcpy(data.szTip,tip); bBkm]  >  
 data.uCallbackMessage=IDM_SHELL; !^c:'I>~  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; o|R*POM  
 data.uID=98; "Y"t2l_n  
 Shell_NotifyIcon(NIM_ADD,&data); FK4nz2&4  
 ShowWindow(SW_HIDE); &/b? I `  
 bTray=TRUE; Nrab*K(][  
}  ET >S  
[@,OG-"&  
void CCaptureDlg::DeleteIcon() />dB%*  
{ :FX'[7;p  
 NOTIFYICONDATA data; +-Z"H)  
 data.cbSize=sizeof(NOTIFYICONDATA); OaD Alrm  
 data.hWnd=GetSafeHwnd(); #6Efev  
 data.uID=98; DFt=%aV[  
 Shell_NotifyIcon(NIM_DELETE,&data); _hAj2%SL  
 ShowWindow(SW_SHOW); 0EL\Hd  
 SetForegroundWindow(); Y9IJ   
 ShowWindow(SW_SHOWNORMAL); Cm,*bgX  
 bTray=FALSE; mF6@Y[/B  
} *G%1_   
!ol hZ  
void CCaptureDlg::OnChange() 7Y-FUZ.`>  
{ &+)+5z_d  
 RegisterHotkey(); 4 7)+'`  
} K;@RUy~  
^l]]qdNr  
BOOL CCaptureDlg::RegisterHotkey() =:xV(GK}  
{ 'Z*\1Ci  
 UpdateData(); u)q2YLK8  
 UCHAR mask=0; SR&(HH$  
 UCHAR key=0; #~bU}[{  
 if(m_bControl) Zu2m%=J`  
  mask|=4; J8sJ~FnUj  
 if(m_bAlt) J6*\>N5W  
  mask|=2; {pcf;1^t  
 if(m_bShift) kj Lsk-  
  mask|=1; H(5S Kv5  
  key=Key_Table[m_Key.GetCurSel()]; }aHB$}"!  
 if(bRegistered){ LVR;&Z>j  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); l>3M|js@/  
  bRegistered=FALSE; Q{J"`d2  
 } ?6gDbE%  
 cMask=mask; TTA{#[=7  
 cKey=key; d&PE,$XC  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); ImUQ*0  
 return bRegistered; w>NZRP_3  
} ?/`C~e<J  
R`Ys;g/!  
  四、小结 <;$Sa's,LE  
.c=$ bQ>^  
  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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