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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: s#Q _Gu  
  }Ch[|D=Wd6  
  一、实现方法 zuj;T,R;  
0XQ-   
  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: :,=Fx</H  
~g96o81V  
#pragma data_seg("shareddata") h=wf>^l  
HHOOK hHook =NULL; //钩子句柄 0JOju$Bl,  
UINT nHookCount =0; //挂接的程序数目 3\9][S-B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 <wqRk<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 8ok7|DJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey k%a?SU<f  
static int KeyCount =0; Ty iU1,oO  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 V?WMj $l<  
#pragma data_seg() c; d"XiA  
n%8#?GC`  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 z+2u-jG  
?-M)54b\  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: {9,R@>R  
{)jk_&c7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR FRD<0o/`  
cKey,UCHAR cMask) #s/{u RYQ  
{ zZw@c?  
 BOOL bAdded=FALSE; o|BFvhg  
 for(int index=0;index<MAX_KEY;index++){ EsNk<Ra  
  if(hCallWnd[index]==0){ ,$SkaTBe  
   hCallWnd[index]=hWnd; 7a27^b  
   HotKey[index]=cKey; cEtZ}2,j  
   HotKeyMask[index]=cMask; paUyS1i  
   bAdded=TRUE; 6#/LyzZq|  
   KeyCount++; QDl)92z  
   break; xBt4~q;#sE  
  } nN!vgn j  
 } Z@8MhJ  
 return bAdded; ENpaaW@!Y  
} /:Rn"0   
//删除热键 @ICejB<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hu`L v  
{ o4U]lK$  
 BOOL bRemoved=FALSE; u>j5`OXo  
 for(int index=0;index<MAX_KEY;index++){ Pi^ECSzQu[  
  if(hCallWnd[index]==hWnd){ /"g[Ay  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ U=_~{[/  
    hCallWnd[index]=NULL; I}I}K~se*  
    HotKey[index]=0; &3+1D1"y/  
    HotKeyMask[index]=0; P<TpG0~(  
    bRemoved=TRUE; Uv#>d}P  
    KeyCount--; j P{:A9T\  
    break; 0#2T0zk  
   } ze-TBh/  
  } + 6i7,U  
 } YY1{v?[  
 return bRemoved; m&(%&}g  
} QfKR pnj(o  
sj?`7kg  
\pT^Zhp)  
  DLL中的钩子函数如下: .eZPp~[lAN  
Ew)n~!s  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 'Y~8_+J?  
{ /gMa"5?,  
 BOOL bProcessed=FALSE; '2Mjz6mBDA  
 if(HC_ACTION==nCode) {PP ^Rb)  
 { S&;T_^|  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 VPq5xSc?  
   switch(wParam) z&6]vN'  
   {  G!> iqG  
    case VK_MENU: !HT>  
     MaskBits&=~ALTBIT; &Sa_%:*D(  
     break; ySPlyhGF  
    case VK_CONTROL: '=Ip5A{S/  
     MaskBits&=~CTRLBIT; e|OG-t[$*  
     break; +aXMHT"U  
    case VK_SHIFT: DkF@XK0c3  
     MaskBits&=~SHIFTBIT; ^=heen<S%  
     break; dvrvpDoE.  
    default: //judge the key and send message 6KZ8 .m}:  
     break; 4F1.D9u  
   } '>S8t/  
   for(int index=0;index<MAX_KEY;index++){ ouu-wQ|(mM  
    if(hCallWnd[index]==NULL) Q T0IW(A  
     continue; x3p;H02i\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a3(7{,Ew  
    { 3f7t%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 7#~m:K@  
     bProcessed=TRUE; hhh: rmEZl  
    } Pv/%s) &y&  
   } f"Vm'0r  
  } Sx4UaV~"  
  else if((lParam&0xc000ffff)==1){ //有键按下 ><:lUt*N2  
   switch(wParam) ] _]6&PZXk  
   { z wniS6R1  
    case VK_MENU: D,m&^P=%e  
     MaskBits|=ALTBIT; #4|i@0n}D  
     break; b|V4Fp  
    case VK_CONTROL: VK@i#/jm  
     MaskBits|=CTRLBIT; C6;](rN)N  
     break; sQ3ayB`  
    case VK_SHIFT: NIXcib"tG  
     MaskBits|=SHIFTBIT; a_}BTkfHa  
     break; A$9_aqbj  
    default: //judge the key and send message IZ(CRKCGBl  
     break; QVZ6;/  
   } .AmM%I4K  
   for(int index=0;index<MAX_KEY;index++){ "n2xn%t{  
    if(hCallWnd[index]==NULL) #uRq] 'P  
     continue; v2uS 6  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;^H+ |&$>  
    { w|UKMbRMU]  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); +h\W~muR  
     bProcessed=TRUE; RWm Q]  
    } 9 %.<V_$  
   } J9KLO=  
  } _-yF9g"I  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ur"e F  
   for(int index=0;index<MAX_KEY;index++){ ; 0_J7  
    if(hCallWnd[index]==NULL) ~D-OL* 2  
     continue; u Z39Vx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) F~0%j}ve  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); & b^*N5<Z  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 'frL/[S  
   } JI#Enh!Lv  
  } N\?Az668?  
 } m^u&g&^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); x) qHeS  
} #o |&MV_j  
i(cb&;Xx:A  
  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: A ** M"T  
Tk|;5^#H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1#X= &N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); nJ0eZBgB]  
Appz1q  
  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: M$hw(fC|m1  
 F3r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) k)GuMw  
{ 7(+ZfY~w"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) `h{mj|~  
 { )/i|"`)>_  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 gm\o>YclS  
  SaveBmp(); $j2)_(<A%Q  
  return FALSE; Am`A[rV0  
 } # yRA. ;  
 …… //其它处理及默认处理 JhXN8Bq33  
} ^9f`3~!#bc  
V +<AG*[  
7a_n\]t465  
  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。 GyM%vGl 3  
v^I%Wm  
  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。 adPU)k_j:  
GoA>sK  
  二、编程步骤 naCI55Wx  
&Zy=vk*  
  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"; Sq]1SW3  
Dk6\p~q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; BQ)43Rr>  
}ucg!i3C  
  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; BCB/cBE  
/4BXF4ksi,  
  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; Z`KXXlJ^i  
g' U^fN  
  5、 添加代码,编译运行程序。 P Y<V  
t[ocp;Q  
三、程序代码 ? NK} q\$  
< l ^ Z;.  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL = +\oL!^  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #$)rwm.jW?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ =qQQ^`^F'~  
#if _MSC_VER > 1000 ~m&oa@*=y  
#pragma once zX Pj7K*  
#endif // _MSC_VER > 1000 [cs8/Q8+  
#ifndef __AFXWIN_H__ 3`q`W9  
#error include 'stdafx.h' before including this file for PCH B\w`)c  
#endif 5-po>1g'  
#include "resource.h" // main symbols N Uml"  
class CHookApp : public CWinApp R7b*(33  
{ DYl{{L8@  
 public: \~1+T  
  CHookApp(); :|Ty 0>k  
  // Overrides  kS9  
  // ClassWizard generated virtual function overrides X;RI7{fW%X  
  //{{AFX_VIRTUAL(CHookApp) py4_hj\v  
 public: l0 _O<  
  virtual BOOL InitInstance();  e n":  
  virtual int ExitInstance(); cK@K\AE  
  //}}AFX_VIRTUAL Im#$iPIvT  
  //{{AFX_MSG(CHookApp) 5E|2 S_)G  
  // NOTE - the ClassWizard will add and remove member functions here. 0~+ k  
  // DO NOT EDIT what you see in these blocks of generated code ! 'm:B(N@+  
  //}}AFX_MSG =LzW#s=O  
  DECLARE_MESSAGE_MAP() ,"ZlY}!Gn  
}; dj]N59<  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 2F{IDcJI\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Yw `VL)v(y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2G;d2LR:  
BOOL InitHotkey(); /Qy0vAvJ  
BOOL UnInit(); fXj  
#endif ?^p8]Va%  
c5pG?jr+d  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. SO"P3X  
#include "stdafx.h" Op~+yMef  
#include "hook.h" MG>;|*$%  
#include <windowsx.h> voEc'JET  
#ifdef _DEBUG |7'W)s5.  
#define new DEBUG_NEW !y.7"G*  
#undef THIS_FILE PN=yf@<V3F  
static char THIS_FILE[] = __FILE__;  v<W++X7z  
#endif K6oLSr+EAK  
#define MAX_KEY 100 zZ-*/THB@R  
#define CTRLBIT 0x04 *uR'eXW  
#define ALTBIT 0x02 gX<C-y6o  
#define SHIFTBIT 0x01 O*7 pg  
#pragma data_seg("shareddata") &baY[[N  
HHOOK hHook =NULL; 2t<CAKBB  
UINT nHookCount =0; Sq>UMfl&  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey O8%/Id  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT `PfC:L  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ML-g"wv  
static int KeyCount =0; Dlp::U*N'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Vv]mME@  
#pragma data_seg() !WXSrICX[  
HINSTANCE hins; 2z:9^a/]Na  
void VerifyWindow(); |EunDb[Y  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) he@swE&  
//{{AFX_MSG_MAP(CHookApp) e6Y0G,K  
// NOTE - the ClassWizard will add and remove mapping macros here. -L@=j  
// DO NOT EDIT what you see in these blocks of generated code! NG ~sE&,7  
//}}AFX_MSG_MAP FU zY&@Y  
END_MESSAGE_MAP() q_bB/   
#%~wuCn<K  
CHookApp::CHookApp() Yhfk{CI  
{ S3w? X  
 // TODO: add construction code here, W;7cF8fu4  
 // Place all significant initialization in InitInstance G8VWx&RE  
} pB`<4+"9  
oID, PB*9  
CHookApp theApp; TD<.:ul]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) e8Jd*AKjb  
{ ``{xm1GK  
 BOOL bProcessed=FALSE; kq+L63fZ  
 if(HC_ACTION==nCode) occ}|u  
 { p)`JVq,H/B  
  if((lParam&0xc0000000)==0xc0000000){// Key up Y&nY]VV  
   switch(wParam) @L0.Z1 ).  
   { 5K0Isuu>>  
    case VK_MENU: e([}dz  
     MaskBits&=~ALTBIT; cOSUe_S0w[  
     break; p 4=^ UP  
    case VK_CONTROL: ~~&M&Fe  
     MaskBits&=~CTRLBIT; OvkYzI`  
     break; $4m{g"xL  
    case VK_SHIFT: 3LG)s:p$/  
     MaskBits&=~SHIFTBIT; @>?&Mw\c  
     break; i -+B{H  
    default: //judge the key and send message j:g/[_0s  
     break; w;XXjT  
   } /J^yOR9  
   for(int index=0;index<MAX_KEY;index++){ SKGYmleR  
    if(hCallWnd[index]==NULL) &@y W< <  
     continue; Y`%:hvy~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UhNeY{6  
    { >Py=H+d!j  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nCt:n}+C7  
     bProcessed=TRUE; fU,sn5zZ  
    } M*nfWQ a  
   } IYd)Vv3'j  
  } ,`K'qms  
  else if((lParam&0xc000ffff)==1){ //Key down IL\#!|>  
   switch(wParam) oE}1D?3Sp  
   { N]gdS]pP2{  
    case VK_MENU: P'[w9'B  
     MaskBits|=ALTBIT; ? r^+-  
     break; Jjv, )@yo  
    case VK_CONTROL: M%Ov6u<I8  
     MaskBits|=CTRLBIT; &q>=6sQvf  
     break; dF"Sz4DY#  
    case VK_SHIFT: 'F1NBL   
     MaskBits|=SHIFTBIT; !ce:S!P  
     break; ygh*oVHO  
    default: //judge the key and send message +c?1\{M   
     break; Y6f0 ?lB  
   } 7i`8 c =.  
   for(int index=0;index<MAX_KEY;index++) 7Q2"]f,$CQ  
   { 4Y[tx]<  
    if(hCallWnd[index]==NULL) ^8-CUH\  
     continue; |d&a&6U:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ry8@U9B6,t  
    { zmF_-Q`c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); j"hfsA<_I  
     bProcessed=TRUE; d H]'&&M  
    } (=,p"3^  
   } \^i/:  
  } ewN!7  
  if(!bProcessed){ +Ccj @#M;  
   for(int index=0;index<MAX_KEY;index++){ q,A;d^g  
    if(hCallWnd[index]==NULL)  1)U%p  
     continue; LNPwb1)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 4vQ]7`I.f  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rjHL06qE  
   } D<78Tm x  
  } 8K=sx @l  
 } }j;*7x8(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .IXkdy  
} .-Yhpw>f  
gP:mZ7  
BOOL InitHotkey() NBU[>P  
{ PRa #; Wb  
 if(hHook!=NULL){ 3=SIIMp7=  
  nHookCount++; nO.RB#I$F  
  return TRUE; /{QR:8}-Q  
 } vau0Jn%=ck  
 else ~\<aj(m(|  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); dz3chy,3  
  if(hHook!=NULL) s~V%eq("}  
   nHookCount++; U51C /A  
  return (hHook!=NULL); v0v%+F#>@  
} OiAP%7i9  
BOOL UnInit() HY|=Z\l"  
{ 9O1#%  
 if(nHookCount>1){ V 3?x_pp  
  nHookCount--; {kVhht]X  
  return TRUE; jg%HaA<zO  
 } >,;, 6|S  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 2?J[D7  
 if(unhooked==TRUE){ <O+T4.z  
  nHookCount=0; C^2J<  
  hHook=NULL; Cp{ j+Ia  
 } &b~if}vcb  
 return unhooked; ':Avh|q3N  
} R{N9'2l:  
yCC.j%@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JzI/kH~  
{ +OM`c7M:  
 BOOL bAdded=FALSE; A|Z'\D0  
 for(int index=0;index<MAX_KEY;index++){ 1FC' iGI  
  if(hCallWnd[index]==0){ fiG/ "/u  
   hCallWnd[index]=hWnd; n^kszIu~  
   HotKey[index]=cKey; ?7n(6kmj4Q  
   HotKeyMask[index]=cMask; (4ueO~jb $  
   bAdded=TRUE; ZoFQJJK56B  
   KeyCount++; k(As^'>  
   break; DSb/+8KT  
  } p:g`K# [F  
 } c^Y&4=>T  
 return bAdded; [ QHSCF5  
} <S/`-/= 2  
T8*<  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0qND2_  
{ z^xrB$8 u  
 BOOL bRemoved=FALSE; SY: gr  
 for(int index=0;index<MAX_KEY;index++){ ? dD<KCbP,  
  if(hCallWnd[index]==hWnd){ 39j "z8 n  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %(72+B70R  
    hCallWnd[index]=NULL; &2i3"9k  
    HotKey[index]=0; ze5Hg'f  
    HotKeyMask[index]=0; kaK0'l2%  
    bRemoved=TRUE; +vR$%  
    KeyCount--; y}TiN!M  
    break; 7F=Xn@ _  
   }  3)5Gzn  
  } zQ[g*  
 } 4d\"gk  
 return bRemoved; j9sK P]w  
} Zjo8/  
<M//zXa  
void VerifyWindow() G|WO  
{ f{]eb1  
 for(int i=0;i<MAX_KEY;i++){ UD 0v ia  
  if(hCallWnd!=NULL){ mQVc ZV  
   if(!IsWindow(hCallWnd)){ "Zu hN(-`  
    hCallWnd=NULL; Z @:5vo  
    HotKey=0; t6zc$0-j "  
    HotKeyMask=0; q;Y9_5S  
    KeyCount--; ?2#!63[Kg  
   } <4caG2~q  
  } ^\Bm5QkS  
 } :j sa.X  
} uyd y[n\  
;H%&Jht  
BOOL CHookApp::InitInstance() i{['18Q$F3  
{ }]8n3&*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); _.Ey_K_1  
 hins=AfxGetInstanceHandle(); P|rsq|',  
 InitHotkey(); N k~Xz  
 return CWinApp::InitInstance(); *6Ojv- G|5  
} QQQ3U  
D)yCuw{M:  
int CHookApp::ExitInstance() 76Drhh(  
{ k>W5ts2+  
 VerifyWindow(); m\3r<*q6  
 UnInit(); 3ug|H  
 return CWinApp::ExitInstance(); OokBi 02b  
} mp^;8??;  
Iyo ey  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 9t`Z_HwdCb  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) NPN*k].  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /}_OCuJJ,  
#if _MSC_VER > 1000 V}leEf2'  
#pragma once (6jr}kP  
#endif // _MSC_VER > 1000 Je|D]w  
MNy)= d&<P  
class CCaptureDlg : public CDialog (-V=&F_  
{ 1QfOD-lv  
 // Construction 1|_8+)i;  
 public: N8$MAW  
  BOOL bTray; z8#c!h<@;  
  BOOL bRegistered; W*'gqwM&  
  BOOL RegisterHotkey(); R]oi&"H@r)  
  UCHAR cKey; un+U_|>c  
  UCHAR cMask; oXCZpS  
  void DeleteIcon(); @J[l^o9  
  void AddIcon(); owYSR?aG  
  UINT nCount; T<p,KqH  
  void SaveBmp(); D,aJ`PK~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5W0'r'{  
  // Dialog Data YNGG> ;L  
  //{{AFX_DATA(CCaptureDlg) ` ,B&oV>  
  enum { IDD = IDD_CAPTURE_DIALOG }; Jm%hb ,  
  CComboBox m_Key; rUunf'w`e1  
  BOOL m_bControl; S#M<d~rK  
  BOOL m_bAlt; l)PEg PSRV  
  BOOL m_bShift; 7e,EI9?.  
  CString m_Path; .O\z:GrSZz  
  CString m_Number; <h_lc}o/  
  //}}AFX_DATA |"[[.Adw9"  
  // ClassWizard generated virtual function overrides u9AXiv+K  
  //{{AFX_VIRTUAL(CCaptureDlg) )N{Qpbh  
 public:  b;!oPT  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |?c v5l7E  
 protected: RvL-SI%E  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nwd 02tu  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); C[j'0@~V:B  
  //}}AFX_VIRTUAL W\{gBjfE  
  // Implementation U=<E,tM  
 protected: ~rBeJZ  
  HICON m_hIcon; v= b`kCH}  
  // Generated message map functions MSPzOJQPy  
  //{{AFX_MSG(CCaptureDlg) >w:px$g4  
  virtual BOOL OnInitDialog(); UQl3Tq4QM  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 1>W|vOv"Z?  
  afx_msg void OnPaint(); .tB[8Y=J  
  afx_msg HCURSOR OnQueryDragIcon(); NpRT\cx3  
  virtual void OnCancel(); a;p3Me7  
  afx_msg void OnAbout(); +p =n-  
  afx_msg void OnBrowse(); ffGiNXCM  
  afx_msg void OnChange(); I71kFtvcy*  
 //}}AFX_MSG zosJ=$L  
 DECLARE_MESSAGE_MAP() \NbMSC&H  
}; 9C5w!_b@  
#endif rj"oz"  
#!\g5 ')mC  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file "Vp+e%cqG  
#include "stdafx.h" 4/S% eZB  
#include "Capture.h" YPAMf&jEF  
#include "CaptureDlg.h" qw[)$icP  
#include <windowsx.h> l -~H Y*  
#pragma comment(lib,"hook.lib") rlYAy5&  
#ifdef _DEBUG _yT Gv-  
#define new DEBUG_NEW 3O<:eS~  
#undef THIS_FILE X )d7y  
static char THIS_FILE[] = __FILE__; vukI`(#  
#endif MyZ@I7Fb,  
#define IDM_SHELL WM_USER+1 50Z$3T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); lmb5Z-xB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); z.{T`Pn  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #_{3W-35*  
class CAboutDlg : public CDialog e!*d(lHKos  
{ D0,U2d  
 public: Klh7&HzR  
  CAboutDlg(); [E_6n$w  
  // Dialog Data :(,uaX> {  
  //{{AFX_DATA(CAboutDlg) m sS5"Qr  
  enum { IDD = IDD_ABOUTBOX }; o Y_(UIa  
  //}}AFX_DATA  :0ZFbIy  
  // ClassWizard generated virtual function overrides g$e b@0$  
  //{{AFX_VIRTUAL(CAboutDlg) ~a&s5E {  
 protected: -Cv:lJj  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ?:OL8&0  
  //}}AFX_VIRTUAL %..{c#V  
  // Implementation ?!1K@/!  
 protected: uiDK&@RS  
  //{{AFX_MSG(CAboutDlg) !"B0z+O>  
  //}}AFX_MSG v-2O{^n  
  DECLARE_MESSAGE_MAP() a6"Pe07t  
}; ~p<o":k+Lv  
UOH2I+@V  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) tsR\c O~/  
{ A1x?_S"a  
 //{{AFX_DATA_INIT(CAboutDlg) .r+u pY  
 //}}AFX_DATA_INIT Ua]shSjyI  
} m/3b7c@r  
U'@eUY(Ov$  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) !vHUe*1a{  
{ %,$/wh)<V  
 CDialog::DoDataExchange(pDX); K.G}*uy  
 //{{AFX_DATA_MAP(CAboutDlg) IZBU<1M  
 //}}AFX_DATA_MAP x9R_KLN:;  
} w+ gA3Dg  
jSp4eq  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ENm\1  
 //{{AFX_MSG_MAP(CAboutDlg) B ?96d'A  
 // No message handlers k !Nl#.j  
 //}}AFX_MSG_MAP '}4LHB;:  
END_MESSAGE_MAP() 4ihv|%@  
7k}[x|u  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) vBAds  
: CDialog(CCaptureDlg::IDD, pParent) 9cud CF  
{ 2[: *0 DV#  
 //{{AFX_DATA_INIT(CCaptureDlg) oUXu;@l  
  m_bControl = FALSE; hK*:pf  
  m_bAlt = FALSE; o,(MB[|hQ  
  m_bShift = FALSE; 9{\e E]0  
  m_Path = _T("c:\\"); xTNWT_d  
  m_Number = _T("0 picture captured."); Q.Uyl:^PxU  
  nCount=0; K*jV=lG  
  bRegistered=FALSE; &(3kwdI  
  bTray=FALSE; !fUrDOM0E  
 //}}AFX_DATA_INIT LM }0QL m?  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 vUh.ev0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); &*iar+vr  
} _!6~o>  
JTB_-J-TU  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [ah%>&u  
{ {t`UV,  
 CDialog::DoDataExchange(pDX); =o]V!MW  
 //{{AFX_DATA_MAP(CCaptureDlg) s,> 1n0a  
  DDX_Control(pDX, IDC_KEY, m_Key); ,9Y{x  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;hU56lfZ)X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "MZj}}l  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); zbn0)JO  
  DDX_Text(pDX, IDC_PATH, m_Path); 1V(tt{  
  DDX_Text(pDX, IDC_NUMBER, m_Number); l&cYN2T b  
 //}}AFX_DATA_MAP xo/[,rR  
} {tn%HK">  
3Qmok@4e)  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #]bWE$sU<  
//{{AFX_MSG_MAP(CCaptureDlg) H~x,\|l#  
 ON_WM_SYSCOMMAND() w A<JJ_R  
 ON_WM_PAINT() Rr+Y::E  
 ON_WM_QUERYDRAGICON() o mstJ9  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) | W:JI  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) jz(}P8  
 ON_BN_CLICKED(ID_CHANGE, OnChange) afY~Y?PJ<  
//}}AFX_MSG_MAP aV3:wp]Gn  
END_MESSAGE_MAP() 3 " fBp  
;QbMVY  
BOOL CCaptureDlg::OnInitDialog() _/0vmgQ&  
{ KO/Z|I  
 CDialog::OnInitDialog(); hhQLld4  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); DEEQ/B{  
 ASSERT(IDM_ABOUTBOX < 0xF000); 3>%oGbo  
 CMenu* pSysMenu = GetSystemMenu(FALSE); )Cl!,m)~  
 if (pSysMenu != NULL) W ]cJP  
 { #M$Gj>E%4  
  CString strAboutMenu; ~_^#/BnAl  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  wc# #'u  
  if (!strAboutMenu.IsEmpty()) %:rct  
  { FTvFtdY  
   pSysMenu->AppendMenu(MF_SEPARATOR); Z}74% 9qE  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); (izGF;N+  
  } 2uw1R;zw  
 } n<47#-  
 SetIcon(m_hIcon, TRUE); // Set big icon 63R?=u@  
 SetIcon(m_hIcon, FALSE); // Set small icon F&? &8.  
 m_Key.SetCurSel(0); CjRI!}S  
 RegisterHotkey(); <:=}1t.Z  
 CMenu* pMenu=GetSystemMenu(FALSE); wWV`k  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); >D20f<w(H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X1Vx 6+[  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #4uuT?!  
 return TRUE; // return TRUE unless you set the focus to a control ,n&@O,XGy  
} ox9$aBjJ  
/~`4a  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~RdJP'YF-  
{ O3, IR1  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) VB x,q3.  
 { yhnhORSY;  
  CAboutDlg dlgAbout; Ubtu?wRBW  
  dlgAbout.DoModal(); *7MTq_K(An  
 } .{,PC  
 else CjW`cHd  
 { Kgev*xg  
  CDialog::OnSysCommand(nID, lParam); aKi&2>c5>  
 } \ZSZ(p#1  
} 9X<o8^V  
k e$g[g  
void CCaptureDlg::OnPaint() 'n1-?T)  
{ =2;2_u?  
 if (IsIconic()) C:Tjue{G2  
 { H(}Jt!/:  
  CPaintDC dc(this); // device context for painting NCm>iEeY  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); )3h%2C1uM  
  // Center icon in client rectangle a:$hK%^ \  
  int cxIcon = GetSystemMetrics(SM_CXICON); frB~ajXK  
  int cyIcon = GetSystemMetrics(SM_CYICON); p6=L}L  
  CRect rect; C*O648yz[  
  GetClientRect(&rect); (sX=#<B%  
  int x = (rect.Width() - cxIcon + 1) / 2; Ur^~fW1 o  
  int y = (rect.Height() - cyIcon + 1) / 2; 9ure:Dko(Y  
  // Draw the icon k 4|*t}o7  
  dc.DrawIcon(x, y, m_hIcon); uL`6}0  
 } z@WuKRsi  
 else +C`h*%BW  
 { AawK/tfs  
  CDialog::OnPaint(); .m',*s<CMQ  
 } )"Ef* /+  
} '<(S*&s  
1Q$ePo   
HCURSOR CCaptureDlg::OnQueryDragIcon() rLt`=bl&&U  
{ Q<TD5t9  
 return (HCURSOR) m_hIcon; #9HQW:On  
} vkFfHzR$  
EVovx7dr  
void CCaptureDlg::OnCancel() B.:DW3  
{ F_KPhe$  
 if(bTray) 3Zy$NsY3  
  DeleteIcon(); .uu[f2.N+  
  CDialog::OnCancel(); +o{]0~ y  
} <p_r{  
@y )'h]d  
void CCaptureDlg::OnAbout() -68E]O  
{ z:Sr@!DZ  
 CAboutDlg dlg; n veHLHvC7  
 dlg.DoModal(); ; E Nhy  
} -}2'P)Xp  
[&IJy  
void CCaptureDlg::OnBrowse() :?!kZD!  
{ |nfFI  
 CString str; v%mAU3M  
 BROWSEINFO bi; `RRC8]l  
 char name[MAX_PATH]; <r[5 S5y  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); egOZ.oV  
 bi.hwndOwner=GetSafeHwnd(); 2(_+PQ6C=  
 bi.pszDisplayName=name; q7itznQSKc  
 bi.lpszTitle="Select folder"; Pfy2PpA  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 3['aK|qk.  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); W(5et5DN,  
 if(idl==NULL) Mq!vu!  
  return; (A\X+S(  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ek0zFnb[Gx  
 str.ReleaseBuffer(); 7d44i  
 m_Path=str; vDG AC'  
 if(str.GetAt(str.GetLength()-1)!='\\') s7x&x;-  
  m_Path+="\\"; AKKp-I5  
 UpdateData(FALSE); `WjRb  
} ?CaMn b8  
6qCRM*V  
void CCaptureDlg::SaveBmp() 03]   
{ 4$j7DJ8dj  
 CDC dc; '}\#bMeObg  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); S4r-s;U-v/  
 CBitmap bm; 4|?y [j6  
 int Width=GetSystemMetrics(SM_CXSCREEN); Ts+S>$  
 int Height=GetSystemMetrics(SM_CYSCREEN); |4=Du-e  
 bm.CreateCompatibleBitmap(&dc,Width,Height); QD<GXPu?N  
 CDC tdc; m|:O:<  
 tdc.CreateCompatibleDC(&dc); !=C74$TH  
 CBitmap*pOld=tdc.SelectObject(&bm); av}Giz  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Y[(U~l,a+  
 tdc.SelectObject(pOld); @X_<y  
 BITMAP btm; sZ-A~X@g  
 bm.GetBitmap(&btm); Y|*a,H"_  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Dz<"eyB\  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); /(iq^  
 BITMAPINFOHEADER bih; 8'niew 5d  
 bih.biBitCount=btm.bmBitsPixel; ~,*=j~#h  
 bih.biClrImportant=0; D*!UB5<>/t  
 bih.biClrUsed=0; 2j9+ f{ l  
 bih.biCompression=0; q+KGQ*   
 bih.biHeight=btm.bmHeight; %K9 9_Cl3  
 bih.biPlanes=1; 5:oteNc3  
 bih.biSize=sizeof(BITMAPINFOHEADER); td}%reH  
 bih.biSizeImage=size; }^ g6Y3\  
 bih.biWidth=btm.bmWidth; 6~:eO(pK l  
 bih.biXPelsPerMeter=0; dX720/R  
 bih.biYPelsPerMeter=0; JO|%Vpco  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); J )*7JX  
 static int filecount=0; n86=1G:%  
 CString name; l\Q--  
 name.Format("pict%04d.bmp",filecount++); l r16*2.  
 name=m_Path+name; EF Z]|Z7  
 BITMAPFILEHEADER bfh; &l&B[s6[  
 bfh.bfReserved1=bfh.bfReserved2=0; ZxDh94w/  
 bfh.bfType=((WORD)('M'<< 8)|'B'); n7CwGN%  
 bfh.bfSize=54+size; )BJ Z{E*  
 bfh.bfOffBits=54; ]J] ~i[  
 CFile bf; vVA)x~^  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 'yIz<o  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); -45xa$vv  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); H N )@sLPc  
  bf.WriteHuge(lpData,size); @v:p)|Ne;  
  bf.Close(); x_k @hGSC  
  nCount++;  x%$as;  
 } o 9?#;B$  
 GlobalFreePtr(lpData); `P(Otr[6  
 if(nCount==1) v 7g?  
  m_Number.Format("%d picture captured.",nCount); K:<0!C!  
 else  ~T'!.^/  
  m_Number.Format("%d pictures captured.",nCount); Z1&<-T_  
  UpdateData(FALSE); 'Cq)/}0  
} K+F]a]kld  
A4|L;z/A[h  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) (Y[q2b  
{ 1dE |q{  
 if(pMsg -> message == WM_KEYDOWN) o&PPW~D+h@  
 { v"~0 3-SX  
  if(pMsg -> wParam == VK_ESCAPE) 7hq$vI%0  
   return TRUE; /,`40^U}  
  if(pMsg -> wParam == VK_RETURN) |s}7<A  
   return TRUE; Y!0ZwwW  
 } &>KZ4%&?  
 return CDialog::PreTranslateMessage(pMsg); V']{n7a-  
}  FTk`Mq  
XW2{I.:in>  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %aHQIoxg  
{ |GqKa  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ymr#OP$<S  
  SaveBmp(); y(2FaTjM  
  return FALSE; ,|Xibfw  
} >ow5aOlQ&  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ nN|1cJ'.Fk  
 CMenu pop; jeLC)lQ*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &i8UPp%  
 CMenu*pMenu=pop.GetSubMenu(0); JIYZ  
 pMenu->SetDefaultItem(ID_EXITICON); TQjM3Ri=V  
 CPoint pt; :"utFBO  
 GetCursorPos(&pt); Ga9^+.j  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); u&7c2|Q  
 if(id==ID_EXITICON) OqW (C  
  DeleteIcon(); 0DIXd*oj&  
 else if(id==ID_EXIT) hOTqbd}  
  OnCancel(); ex}6(;7)O  
 return FALSE; 017(I:V?(:  
} `~S ; UG   
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ~UhTy~jya  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) )c"m:3D@  
 AddIcon(); Qjl.O HO  
 return res; Fb:Z.  
} v_s(  
<T0+-]i  
void CCaptureDlg::AddIcon() #383W)n  
{ h,u?3}Knnb  
 NOTIFYICONDATA data; ?--EIA8mfp  
 data.cbSize=sizeof(NOTIFYICONDATA); dEuts*@ Q  
 CString tip; 41'|~3\X  
 tip.LoadString(IDS_ICONTIP); yo=0Ov  
 data.hIcon=GetIcon(0); l^,"^ vz  
 data.hWnd=GetSafeHwnd(); 4#c-?mh_  
 strcpy(data.szTip,tip); 7yDWcm_y  
 data.uCallbackMessage=IDM_SHELL; q%H#04Yh  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; q4wS<, 3  
 data.uID=98; [ {|868  
 Shell_NotifyIcon(NIM_ADD,&data); OU /=wpt  
 ShowWindow(SW_HIDE); 9R6]OL)p  
 bTray=TRUE; '9R.$,N  
} u#&ZD|  
BWHH:cX  
void CCaptureDlg::DeleteIcon() q0a8=o"|  
{ {*jo,<4ee  
 NOTIFYICONDATA data; c@xQ2&i  
 data.cbSize=sizeof(NOTIFYICONDATA); d2!A32m  
 data.hWnd=GetSafeHwnd(); w$2Z7S  
 data.uID=98; 3{j&J-  
 Shell_NotifyIcon(NIM_DELETE,&data); <8[y2|UBt  
 ShowWindow(SW_SHOW); dhAkD-Lh  
 SetForegroundWindow(); &LD=Zp%  
 ShowWindow(SW_SHOWNORMAL); Ld?-Ik~fF>  
 bTray=FALSE; 'q:t48&  
} ~g_]Sskf7  
Oz: J8l%  
void CCaptureDlg::OnChange() z|5Sy.H>  
{ X-$\DXRIo  
 RegisterHotkey(); i7UE9Nyl*  
} Up/s)8$.  
fZH";_"1  
BOOL CCaptureDlg::RegisterHotkey() 2 u{"R  
{ !B#Lea  
 UpdateData(); 42Vz6 k:  
 UCHAR mask=0; \~O}V~wE  
 UCHAR key=0; L,<5l?u  
 if(m_bControl) 2Y`C\u  
  mask|=4; JTw3uM, e  
 if(m_bAlt) 9t1aR*b&@  
  mask|=2; mK>c+ u)  
 if(m_bShift) Gop;!aV1*  
  mask|=1; rz  
  key=Key_Table[m_Key.GetCurSel()]; Z^ e?V7q  
 if(bRegistered){ n.a55uy  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6u'+#nm  
  bRegistered=FALSE; 4%]wd}'#Un  
 } Gh:hfHiG  
 cMask=mask; j1yW{  
 cKey=key; kp4(_T7R  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 8)1 k>=  
 return bRegistered; t5qNfiKC  
} *s"dCc  
 YXdd=F  
  四、小结 F_?aoP&5  
k70o=}  
  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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