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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: lO:. OZu  
  'Peni1_  
  一、实现方法 >R/$1e1Y  
g,:j/vR  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: M/Pme&%  
"n:{ !1VGw  
#pragma data_seg("shareddata") )etmE  
HHOOK hHook =NULL; //钩子句柄 c%*($)#  
UINT nHookCount =0; //挂接的程序数目 l^J75$7  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 OGiV{9U  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 lnGq :-  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey %P;Q|v6/|  
static int KeyCount =0; Quf_'  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 0q\7C[R_  
#pragma data_seg() `"@X.}\  
CQ;]J=|<_  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 W(RF n`g\  
7*DMVok:  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: {G*A.$-d  
ceGa([#!\_  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR e4FM} z[  
cKey,UCHAR cMask) 1y^K/.5-  
{ )6~1 ^tD  
 BOOL bAdded=FALSE; d3^OEwe  
 for(int index=0;index<MAX_KEY;index++){ rw)kAe31  
  if(hCallWnd[index]==0){ v+"rZ  
   hCallWnd[index]=hWnd; '&;yT[  
   HotKey[index]=cKey; | nJZie8m  
   HotKeyMask[index]=cMask; H&b3{yOa  
   bAdded=TRUE; BK,sc'b  
   KeyCount++; S]sk7  
   break; r3rxC&  
  } NrDi   
 } 6a}"6d/sTL  
 return bAdded; 27ckdyQx  
} 9{j66  
//删除热键 [~D|peM3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^BZkHAp  
{ TgU**JN)  
 BOOL bRemoved=FALSE; m\ /(w_/?  
 for(int index=0;index<MAX_KEY;index++){ ;jK#[*y  
  if(hCallWnd[index]==hWnd){ U-wLt(Y<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Q '(ihUq*k  
    hCallWnd[index]=NULL; $V6^G*Q  
    HotKey[index]=0; *s}|Hy  
    HotKeyMask[index]=0; o  A* G  
    bRemoved=TRUE; g=}v>[k E  
    KeyCount--; J` { 6l  
    break; [=*E+Oc  
   } Bqws!RM'&@  
  } wxLXh6|6%_  
 } 6`\]derSon  
 return bRemoved; $3=:E36K  
} H]<]^Zmjy  
(UNtRz'=;  
gJ2 H=#M  
  DLL中的钩子函数如下: (kTXP_  
64Gi8|P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) vAP{;Q0 i  
{ <I;*[;AK  
 BOOL bProcessed=FALSE; U3vEdw<lV  
 if(HC_ACTION==nCode) YEjY8]t  
 { 5=?i;P  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 (B>Zaro#  
   switch(wParam) 0@1:M  
   {  ZA#y)z8!E  
    case VK_MENU: wN37zPnV~  
     MaskBits&=~ALTBIT; 5TBI<K  
     break; :&'{mJW*{t  
    case VK_CONTROL: D 7shiv|,  
     MaskBits&=~CTRLBIT; J3S&3+2G  
     break; Mu_i$j$vvP  
    case VK_SHIFT: T#:F]=  
     MaskBits&=~SHIFTBIT; vd#,DU=p!  
     break; LU!1s@  
    default: //judge the key and send message -'rj&x{Q)U  
     break; ")s!L"x  
   } Q"a2.9Eo  
   for(int index=0;index<MAX_KEY;index++){ |c-LSs'\  
    if(hCallWnd[index]==NULL) SP 2 8  
     continue; -7'#2P<)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9CUimZ  
    { ?SY<~i<K-  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;'RFo?u K  
     bProcessed=TRUE; 4YbC(f  
    } @kngI7=E  
   } 7INk_2  
  } ioIv=qGdiP  
  else if((lParam&0xc000ffff)==1){ //有键按下 OsW"CF2  
   switch(wParam) X<Za9  
   { mp `PE=  
    case VK_MENU: ZcPUtun  
     MaskBits|=ALTBIT; }$&WC:Lg  
     break; %u]6KrG18b  
    case VK_CONTROL: AvRcS]@=  
     MaskBits|=CTRLBIT; _^uc 0=  
     break; _[E\=  
    case VK_SHIFT: ;?6>mh(`  
     MaskBits|=SHIFTBIT; "!&B4  
     break; I"!'AI-  
    default: //judge the key and send message \v`#|lT$  
     break; 2o{@nN8%  
   } ^JhFI*  
   for(int index=0;index<MAX_KEY;index++){ LZWS^77  
    if(hCallWnd[index]==NULL) uIP iM8(  
     continue; +BB0wY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) SfI*bJo>V  
    { .Vx|'-u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4UCwT1  
     bProcessed=TRUE; vnsSy33K  
    } n85r^W  
   } G:+16XCra  
  } (L#%!bd  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D3?N<9g  
   for(int index=0;index<MAX_KEY;index++){ ce5nG0@#  
    if(hCallWnd[index]==NULL) ^pcRW44K  
     continue; Dr 'sIH^  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) R#0{Wg0O)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); x}"Q8kD  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ]bfqcmh<  
   } +Jw{qQR/*  
  } `` -k{C#F  
 } p37|zX  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); q z:]-A  
} A[9NP-~  
uu3M{*}  
  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: i`~~+6`J  
+ zDc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 6$z'wy/*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4g!7 4a  
{bTeAfbf]  
  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: n#>5?W  
`cO|RhD @  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) no3Z\@%  
{ *:#Z+7x ]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Qu}N:P9l?X  
 { %]GV+!3S  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Vi,Y@+4  
  SaveBmp(); Y`]rj-8f0B  
  return FALSE; c(:Oyba  
 } b]K>vhQV  
 …… //其它处理及默认处理 $`Rxn*}V4#  
} #7C6yXb%  
V2QW\2@$  
BvI 0v:  
  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。 CXa Ld7nMX  
Oo/8Y E @  
  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。 cKpQr7]ur  
AY@k-4  
  二、编程步骤 5Jd` ^U  
kd`YSkZ  
  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"; EP0a1.C  
OequU'j  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; )]}$   
>Qk97we'9  
  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; ER2V*,n@  
7V/Zr  
  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; I}ndRDz[  
HSql)iT  
  5、 添加代码,编译运行程序。 zi_[ V@Es/  
4L $};L  
三、程序代码 i]@c.Q iFN  
YR8QO-7 .)  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL pLJeajv)z  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |DGCdB|`G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ XJ\_ V[WA  
#if _MSC_VER > 1000  2+Vp'5>&  
#pragma once Q6|@N~UeZ  
#endif // _MSC_VER > 1000 ]wR6bEm7  
#ifndef __AFXWIN_H__ p`L L   
#error include 'stdafx.h' before including this file for PCH ex:3ua$N  
#endif ]eD[4Y\#t  
#include "resource.h" // main symbols }M="oN~w  
class CHookApp : public CWinApp YZ{;%&rB  
{ yW:AVqE)t  
 public: )Kr(Y.w  
  CHookApp(); klo^K9!  
  // Overrides S}O5l}E  
  // ClassWizard generated virtual function overrides 0O^U{#*$I  
  //{{AFX_VIRTUAL(CHookApp) P8u"T!G  
 public: ?qIGQ/af&  
  virtual BOOL InitInstance(); H<{*ub4'L*  
  virtual int ExitInstance(); @@; 1%z  
  //}}AFX_VIRTUAL Lm.Ik}Gli  
  //{{AFX_MSG(CHookApp) fW[_+r]  
  // NOTE - the ClassWizard will add and remove member functions here. ~"\P~cg0J  
  // DO NOT EDIT what you see in these blocks of generated code ! .;j"+Ef   
  //}}AFX_MSG y "<JE<X  
  DECLARE_MESSAGE_MAP() }Uq/kei^P  
}; ![j(o!6&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); |:}L<9Sq  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); R<t&F\>  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 8db6(Q~P  
BOOL InitHotkey(); *eMLbU7  
BOOL UnInit(); /T{mS7EpYc  
#endif |})rt5|f1!  
ruWye1X;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. HN^w'I'bp  
#include "stdafx.h" $*wu~  
#include "hook.h" Km%8Yw0+  
#include <windowsx.h> sAf9rZt*'  
#ifdef _DEBUG ]KzJ u`O%G  
#define new DEBUG_NEW `dP? 2-Z  
#undef THIS_FILE -IGMl_s  
static char THIS_FILE[] = __FILE__; [10$a(g\x  
#endif x9 TuweG  
#define MAX_KEY 100 cFe V?a  
#define CTRLBIT 0x04 ;,R[]B01u  
#define ALTBIT 0x02 E=3#TBd  
#define SHIFTBIT 0x01 :E}6S  
#pragma data_seg("shareddata") &(GopWR`e  
HHOOK hHook =NULL; 8 `yB  
UINT nHookCount =0; v)TUg0U=,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey  $.=5e3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT &C\=!r0j^  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +~@7" |d  
static int KeyCount =0; tYF$#Nor#k  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift K T%i,T  
#pragma data_seg() x!Y(Y=i>  
HINSTANCE hins; #V,LNX)  
void VerifyWindow(); % 1OC#&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) hwc:@'  
//{{AFX_MSG_MAP(CHookApp) 1mAUEQ!  
// NOTE - the ClassWizard will add and remove mapping macros here. Al)lWD}j2g  
// DO NOT EDIT what you see in these blocks of generated code! 5Gc_LI&v7  
//}}AFX_MSG_MAP F%9e@{  
END_MESSAGE_MAP() 0oXK&Z  
3#7ENV`  
CHookApp::CHookApp() ~D$#>'C#  
{ A3m{jbh  
 // TODO: add construction code here, ccIDMJ=2  
 // Place all significant initialization in InitInstance 8|fLe\"  
} D<lQoO+  
Cln^1N0  
CHookApp theApp; <aD'$(N5  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jt0H5-x  
{ VZAuUw+M  
 BOOL bProcessed=FALSE; W` WLW8Qsw  
 if(HC_ACTION==nCode) &E} I  
 { Ka[Sm|-q  
  if((lParam&0xc0000000)==0xc0000000){// Key up IY-(- a8  
   switch(wParam) X L{{7%j  
   { HCI'q\\  
    case VK_MENU: ^U R-#WaQ  
     MaskBits&=~ALTBIT; gNG0k$nP  
     break; nD^{Q[E6=  
    case VK_CONTROL: W9:fKP  
     MaskBits&=~CTRLBIT; @2)t#~Wc4h  
     break; i7Y s_8A"9  
    case VK_SHIFT: q}wl_ku9+  
     MaskBits&=~SHIFTBIT; gK&5HTo  
     break; %g2/ o^c*  
    default: //judge the key and send message J r=REa0  
     break; oHv{Y  
   } @2-Hj~  
   for(int index=0;index<MAX_KEY;index++){ s|fCR  
    if(hCallWnd[index]==NULL) 1jR=h7^=  
     continue; S.zg&   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,<R>Hiwg/s  
    { ,AGM?&A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hpd(d$j  
     bProcessed=TRUE; Fr938q6^-  
    } 6{Krw \0  
   } g6x/f<2x  
  } S,ouj;B  
  else if((lParam&0xc000ffff)==1){ //Key down we6+2  
   switch(wParam) (CKhY~,/u  
   { ,(1vEE[9-  
    case VK_MENU: (,d4"C  
     MaskBits|=ALTBIT; v9X7-GJ~  
     break; `</=AY>  
    case VK_CONTROL: LZ=wz.'u  
     MaskBits|=CTRLBIT; <(u3+`f1s  
     break; G_4K+ -K  
    case VK_SHIFT: #"3[f@|e  
     MaskBits|=SHIFTBIT; a>;3 j  
     break; +xoyKP!  
    default: //judge the key and send message pe`TH::p  
     break; 2tg/S=t}  
   } GqmDDL1  
   for(int index=0;index<MAX_KEY;index++) N2+mN0k;  
   { bUY:XmA  
    if(hCallWnd[index]==NULL) ,)B~cic'u  
     continue; SXT@& @E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) =rf )yp-D  
    { (Von;U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); W>aQ tT  
     bProcessed=TRUE; :8\*)"^E  
    } '7RR2f>V  
   } -+j9X;h:  
  } KNO*)\   
  if(!bProcessed){ /r::68_KQP  
   for(int index=0;index<MAX_KEY;index++){ s K""  
    if(hCallWnd[index]==NULL) 'PmHBQvt&  
     continue; i{1)=_$Vt`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) bv:0EdVr  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); n',9#I(!L  
   } jWO&SWso  
  } )sqp7["-  
 } : pE-{3I  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); + Tgy,oD0  
} i4{ /  
H`+]dXLB  
BOOL InitHotkey() r-1yJ  
{ Kd AR)EU>  
 if(hHook!=NULL){ )eTnR:=  
  nHookCount++; ^^t]vojX  
  return TRUE; 82^ z -t{  
 } EA%#/n  
 else 'AAF/9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ^6N3 nkyZ  
  if(hHook!=NULL) lu G023'  
   nHookCount++; ur~Tql  
  return (hHook!=NULL); uJ) \P  
} ^>vO5Ho.  
BOOL UnInit() h^[pp c{Z  
{ $h|I7`  
 if(nHookCount>1){ 9:}RlL+cOk  
  nHookCount--; F| ,Vw{  
  return TRUE; i"r.>X'Z  
 } O;&yA<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Rpa A)R,  
 if(unhooked==TRUE){ M rH%hRV6R  
  nHookCount=0; qw Kh,[]  
  hHook=NULL; gOES2 4$2  
 } ATXx? b8h  
 return unhooked; ?=|) n%  
} fxtYo,;$  
m\}\RnZu  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) =oKPMmpCZ  
{ <Vr] 2mw  
 BOOL bAdded=FALSE; Hm8EYPr J  
 for(int index=0;index<MAX_KEY;index++){ Gr"2G,,VI  
  if(hCallWnd[index]==0){ wFoR,oXtL/  
   hCallWnd[index]=hWnd; U# FJ8CD&u  
   HotKey[index]=cKey; f4aD0.K.g|  
   HotKeyMask[index]=cMask; .eDxIWW+ft  
   bAdded=TRUE; =E6i1x%j  
   KeyCount++; o<Rxt *B  
   break; n_!]B_Vd$  
  } ([4{n  
 } fDm}J  
 return bAdded; u[6`Jr~  
} (-G(^Tn  
]( U%1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) A]~iuUHm  
{ 8en#PH }  
 BOOL bRemoved=FALSE; 6wvhvMkS  
 for(int index=0;index<MAX_KEY;index++){ ,uqbS  
  if(hCallWnd[index]==hWnd){ +=29y@c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 61eKGcjs:  
    hCallWnd[index]=NULL; [jtj~]&mO  
    HotKey[index]=0; 5  a*'N~  
    HotKeyMask[index]=0; Um0<I)  
    bRemoved=TRUE; V;(*\"O  
    KeyCount--; Jj^<:t5{rN  
    break; 4{;8 ]/.a  
   } E#HU?<q8  
  } _>:=<xyOq  
 } }mT%N eS  
 return bRemoved; aBA#\eV  
} GO:1 Z?^  
J?,!1V=  
void VerifyWindow() 5)SZd)  
{ '\E*W!R.]  
 for(int i=0;i<MAX_KEY;i++){ NId~| &\  
  if(hCallWnd!=NULL){ mGyIr kE  
   if(!IsWindow(hCallWnd)){ oE|{|27X  
    hCallWnd=NULL; {dSU \':  
    HotKey=0; iR}i42Cu  
    HotKeyMask=0; S;AnpiBM8  
    KeyCount--; &0<R:K?>N  
   } 7yCx !P;  
  } 9|kEq>d  
 } p6eDd"Y  
} c402pj  
oe_[h]Hgl  
BOOL CHookApp::InitInstance() 5KPPZmO  
{ ;(iUY/ h[h  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ^$s~qQQ}B  
 hins=AfxGetInstanceHandle(); Iz$W3#hi  
 InitHotkey(); J'Mgj$T $  
 return CWinApp::InitInstance(); 5)zh@aJ@  
} IkXKt8`YVA  
&fNE9peQFa  
int CHookApp::ExitInstance() S bqM=I+  
{ p~zTRnm  
 VerifyWindow(); a518N*]j  
 UnInit(); uL2 {v  
 return CWinApp::ExitInstance(); Vwh&^{Eh  
} qu~"C,   
LXEu^F~{u#  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 0 c'2rx  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) s? \9i6  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ fOjt` ~ToI  
#if _MSC_VER > 1000 d\<aJOi+-  
#pragma once #/sE{jm  
#endif // _MSC_VER > 1000 02 c.;ka3  
[Jh))DIx  
class CCaptureDlg : public CDialog >fzzrD}]  
{ kFZu/HRI  
 // Construction >zx50e)  
 public: u.K'"-xt4K  
  BOOL bTray; 'FA)LuAok  
  BOOL bRegistered; . eag84_  
  BOOL RegisterHotkey(); eRqexqO!  
  UCHAR cKey; ,["|wqM  
  UCHAR cMask; d~1"{WPSn  
  void DeleteIcon(); 'N,NG$G2  
  void AddIcon(); 6Oqnb+  
  UINT nCount; D30Z9_^%:  
  void SaveBmp(); mM^8YL  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor T+`GOFx  
  // Dialog Data O}iKPY8K  
  //{{AFX_DATA(CCaptureDlg) {aa,#B] i  
  enum { IDD = IDD_CAPTURE_DIALOG }; JP% ;rAoJ  
  CComboBox m_Key; )*<d1$aM  
  BOOL m_bControl; g8qAJ4  
  BOOL m_bAlt; ]=XL9MI  
  BOOL m_bShift; 7/$Z7J!k  
  CString m_Path; (a4y1k t-  
  CString m_Number; J3}C T  
  //}}AFX_DATA m_ONsZHy  
  // ClassWizard generated virtual function overrides jE5 9h  
  //{{AFX_VIRTUAL(CCaptureDlg) Fu$Gl$qV?%  
 public: f%%En5e +  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2i'-lM=  
 protected:  ~9jP++&  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V`&*%xgGR  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yT9RNo/w  
  //}}AFX_VIRTUAL EjCzou  
  // Implementation 7}7C0mV3  
 protected: .B-,GD}  
  HICON m_hIcon; P*=3$-`  
  // Generated message map functions Z42Suy  
  //{{AFX_MSG(CCaptureDlg) hQLx"R$  
  virtual BOOL OnInitDialog(); M#<fh:>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ?BZ`mrH^  
  afx_msg void OnPaint(); n{NgtH\V  
  afx_msg HCURSOR OnQueryDragIcon(); 48*pKbbM4  
  virtual void OnCancel(); Q 6<Uui w  
  afx_msg void OnAbout(); HQj4h]O#  
  afx_msg void OnBrowse(); >!.lr9(l  
  afx_msg void OnChange(); ~l(tl[  
 //}}AFX_MSG ba:^zO^  
 DECLARE_MESSAGE_MAP() `fh_8%m]*  
}; e~[z]GLO%  
#endif d33Nx)No  
7027@M?A?  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file `5jB|r/  
#include "stdafx.h" ~g|0uO}.  
#include "Capture.h" B{7/A[$%C  
#include "CaptureDlg.h" 5Jd {Ev  
#include <windowsx.h> _( /lBf{|  
#pragma comment(lib,"hook.lib") ~4gKA D  
#ifdef _DEBUG AsF`A"Cdw<  
#define new DEBUG_NEW ,+evP=(cX  
#undef THIS_FILE &!fcLJd  
static char THIS_FILE[] = __FILE__; RLX^'g+P  
#endif AQU: 0  
#define IDM_SHELL WM_USER+1 ]KT,s].  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 7}85o J  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ``CADiM:S  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; @n'ss!h  
class CAboutDlg : public CDialog 1caod0gor  
{ !9OgA  
 public: UHHKI)(  
  CAboutDlg(); .[ s82c]]6  
  // Dialog Data Tz~ ftf  
  //{{AFX_DATA(CAboutDlg) +>({pHZ<S  
  enum { IDD = IDD_ABOUTBOX }; |.W;vc<  
  //}}AFX_DATA l[{}ZKZ  
  // ClassWizard generated virtual function overrides bncFrzp#o  
  //{{AFX_VIRTUAL(CAboutDlg) ="E V@H?U  
 protected: (ZsR=:9(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support HKw4}FC*  
  //}}AFX_VIRTUAL a$& 6a   
  // Implementation o:*iT =l  
 protected: ixpG[8s  
  //{{AFX_MSG(CAboutDlg) Lxrn#Z eM  
  //}}AFX_MSG 2 -8:qmP(  
  DECLARE_MESSAGE_MAP() fbkjK`_q  
}; "b7C0NE  
IV*$U7~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) b;ZAz  
{ rJj~cPwL"  
 //{{AFX_DATA_INIT(CAboutDlg) z5w|+9U  
 //}}AFX_DATA_INIT .q}k  
} >xgd<  
zt}p-U2I  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,KaWP  
{ EOC"a}Cq-  
 CDialog::DoDataExchange(pDX); fdW={}~  
 //{{AFX_DATA_MAP(CAboutDlg) bd}SB-D  
 //}}AFX_DATA_MAP ?QVI'R:Z?  
} -2d&Aq4m)  
;Nij*-U4~  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) JFdzA  
 //{{AFX_MSG_MAP(CAboutDlg) @U5>w\  
 // No message handlers W{aNS@1  
 //}}AFX_MSG_MAP c>.Xc[H  
END_MESSAGE_MAP() Lcm!e  
BT0hx!Ti  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) MqH~L?~}|  
: CDialog(CCaptureDlg::IDD, pParent) z6(Q 3@iO  
{ eQj/)@B:V  
 //{{AFX_DATA_INIT(CCaptureDlg) F tjm@:X  
  m_bControl = FALSE; j]SkBZgik  
  m_bAlt = FALSE; ?yK\L-ad  
  m_bShift = FALSE; ]aL}&GlHt  
  m_Path = _T("c:\\"); w7u >|x!  
  m_Number = _T("0 picture captured."); ^Yz05\  
  nCount=0; Z Z7U^#RT  
  bRegistered=FALSE; d5hE!=  
  bTray=FALSE; s ~G{-)*  
 //}}AFX_DATA_INIT OK(d&   
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4y.[tk5  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "<#:\6aym  
} Df^S77&c!  
P#PQ4uK \  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ?Pc 3*.  
{ n Lb 9$&  
 CDialog::DoDataExchange(pDX); >j3N-;o@?  
 //{{AFX_DATA_MAP(CCaptureDlg) Bs}>#I  
  DDX_Control(pDX, IDC_KEY, m_Key); Q8i6kf!  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {c; 3$  
  DDX_Check(pDX, IDC_ALT, m_bAlt); dW68lVWq_  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]+P &Y:   
  DDX_Text(pDX, IDC_PATH, m_Path); W9"I++~f  
  DDX_Text(pDX, IDC_NUMBER, m_Number); *6tN o-)^  
 //}}AFX_DATA_MAP C"<@EMU9  
} t`B']Ac;T  
4uA^/]ygo  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) (=9&"UH  
//{{AFX_MSG_MAP(CCaptureDlg) c2/HY8ttRD  
 ON_WM_SYSCOMMAND() #J_i 5KmXJ  
 ON_WM_PAINT() ^ EOjq  
 ON_WM_QUERYDRAGICON() bk]|C!7$  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Q2Rj0E`  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )/'s& D  
 ON_BN_CLICKED(ID_CHANGE, OnChange) $EF@x}h:A  
//}}AFX_MSG_MAP d .A0(*k,  
END_MESSAGE_MAP() M-Bw9`#Jw  
 Km7  
BOOL CCaptureDlg::OnInitDialog() UEUTu}4y  
{ $!Tw`O  
 CDialog::OnInitDialog(); @@jdF-Utj;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `Fj(g!`  
 ASSERT(IDM_ABOUTBOX < 0xF000); J^4k}  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 2wCRT}C  
 if (pSysMenu != NULL) 8n?.w:Y/  
 { tw66XxE  
  CString strAboutMenu; HJmO+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); [eRMlSXA  
  if (!strAboutMenu.IsEmpty()) Ay]5GA!W+  
  { "RLb wm~  
   pSysMenu->AppendMenu(MF_SEPARATOR); -w B AFr  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); o*_D  
  } 5mU_S\)4:z  
 } ^>fs  
 SetIcon(m_hIcon, TRUE); // Set big icon "L]_NS T  
 SetIcon(m_hIcon, FALSE); // Set small icon `Z-`-IL  
 m_Key.SetCurSel(0); j$6}r  
 RegisterHotkey(); e^yB9b  
 CMenu* pMenu=GetSystemMenu(FALSE); jxvVp*-=<j  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); L@XeAEIq  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); \~PFD%]:3  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ?F/3]lsggT  
 return TRUE; // return TRUE unless you set the focus to a control *rLs!/[Z_  
} )T?ryp3ev  
KXJHb{?  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) k&b>-QP6  
{ ~ 4a aJ0  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) Lg1Usy%  
 { ,tZwXP{  
  CAboutDlg dlgAbout; )c/] 8KU  
  dlgAbout.DoModal(); @_{"ho  
 } $4&Ql  
 else `c(@WK4  
 { rzu^br9X  
  CDialog::OnSysCommand(nID, lParam); ;QYK {3R?  
 } {/ta1&xyG  
} '' 6  
y.zQ `  
void CCaptureDlg::OnPaint() c,@6MeKHq  
{ v,;?+Ck  
 if (IsIconic()) =R05H2hs  
 { jKzj Tn9{E  
  CPaintDC dc(this); // device context for painting s>5 Z  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); >EY0-B  
  // Center icon in client rectangle o&]qjFo\m  
  int cxIcon = GetSystemMetrics(SM_CXICON); k;sUDmrO  
  int cyIcon = GetSystemMetrics(SM_CYICON); @UKd0kxPN{  
  CRect rect; C1=[\c~jw  
  GetClientRect(&rect); (k?OYz]c  
  int x = (rect.Width() - cxIcon + 1) / 2; PsLCO(26  
  int y = (rect.Height() - cyIcon + 1) / 2; !ZRV\31%  
  // Draw the icon iQKfx#kt  
  dc.DrawIcon(x, y, m_hIcon); om1 / 9  
 } XL:7$  
 else * XJSa  
 { i+;E uHf  
  CDialog::OnPaint(); :O7J9K|  
 } 6XP>p$-  
} y{&,YV&_h  
nMhc3t  
HCURSOR CCaptureDlg::OnQueryDragIcon() .NKN2  
{ 4:.M*Dz  
 return (HCURSOR) m_hIcon; /SiQw7yp%  
} ^N]*Zf~N?  
oW6.c]Vo  
void CCaptureDlg::OnCancel() WCH>9Z>cj  
{ >9 iv>  
 if(bTray) KvQ9R!V  
  DeleteIcon(); du !.j  
  CDialog::OnCancel(); "jSn`  
} FB@G.f  
yZ`\.GgC^&  
void CCaptureDlg::OnAbout() (~jOtUyT  
{ WI%,m~  
 CAboutDlg dlg; `)'YU^s  
 dlg.DoModal(); }sFHb[I &  
} FW2} 9#R  
OHU(?TBo  
void CCaptureDlg::OnBrowse() >a<;)K^1  
{ M<SZ7^9<  
 CString str; q bo`E!K  
 BROWSEINFO bi; | !Knd ^}  
 char name[MAX_PATH]; wegBMRQVp  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); zIu1oF4[  
 bi.hwndOwner=GetSafeHwnd(); H_{Yr+p  
 bi.pszDisplayName=name; ,D8 Tca\v  
 bi.lpszTitle="Select folder"; BEw(SQH  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ?IK[]=!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ||hd(_W8  
 if(idl==NULL) C-8@elZ1  
  return; YJ6Xq||_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); k@?<Aw8 _X  
 str.ReleaseBuffer(); :0J;^@   
 m_Path=str; 5lT lZRH1  
 if(str.GetAt(str.GetLength()-1)!='\\') PH6uP]  
  m_Path+="\\"; 2'D2>^os  
 UpdateData(FALSE); j9%=^ZoQj  
} {'/8{dS  
>1YJETysO  
void CCaptureDlg::SaveBmp() JH 8^ZP:d'  
{ r;-\z(h  
 CDC dc; @ Fu|et  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #(%6urd  
 CBitmap bm; QgP UP[  
 int Width=GetSystemMetrics(SM_CXSCREEN); ='(:fHhhX  
 int Height=GetSystemMetrics(SM_CYSCREEN); w0pH|$"/P  
 bm.CreateCompatibleBitmap(&dc,Width,Height); S;Vj5  
 CDC tdc; gD-<^Q-  
 tdc.CreateCompatibleDC(&dc); xu3qX"  
 CBitmap*pOld=tdc.SelectObject(&bm); Ra/S46$  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); T a_#Rg*!  
 tdc.SelectObject(pOld); T!8,R{V]4  
 BITMAP btm; *cf#:5Nl  
 bm.GetBitmap(&btm); SO|$X  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Gd!y,n&s  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); @>:r'Fmu-  
 BITMAPINFOHEADER bih; O %OeYO69  
 bih.biBitCount=btm.bmBitsPixel; "bJWyUb  
 bih.biClrImportant=0; ./u3z|q1  
 bih.biClrUsed=0;  0y?bwxkc  
 bih.biCompression=0; 9Z} -%Z[,)  
 bih.biHeight=btm.bmHeight; D ,nF0p  
 bih.biPlanes=1; LVX.stN#p  
 bih.biSize=sizeof(BITMAPINFOHEADER); C&\#{m_1B  
 bih.biSizeImage=size; LKhUqW  
 bih.biWidth=btm.bmWidth; BV|LRB}G  
 bih.biXPelsPerMeter=0; flRok?iF  
 bih.biYPelsPerMeter=0; Gx!Y 4Q}-  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); o<Q~pd#Ip,  
 static int filecount=0; Wh,p$|vL  
 CString name; `rvS(p[s  
 name.Format("pict%04d.bmp",filecount++); KrB"2e+J  
 name=m_Path+name; uZCPxog  
 BITMAPFILEHEADER bfh; L+&$/1h]  
 bfh.bfReserved1=bfh.bfReserved2=0; zpJQ7hym  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Zv-#v  
 bfh.bfSize=54+size; q.*k J/L  
 bfh.bfOffBits=54; _G@)Bj^*  
 CFile bf; 3:s!0ty"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ G22u+ua  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'vBuQinn  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); o^mW`g8[  
  bf.WriteHuge(lpData,size); #>}cuC@  
  bf.Close(); t~3!| @3i  
  nCount++; `$05+UU  
 } H+` Zp  
 GlobalFreePtr(lpData); Pa+%H]vB  
 if(nCount==1) {;q zz9 |  
  m_Number.Format("%d picture captured.",nCount); ^tI ,eZ  
 else `Ps&N^[  
  m_Number.Format("%d pictures captured.",nCount); ?|kwYA$4o  
  UpdateData(FALSE); C h>r.OfP  
} )m|)cLT&  
f]Xh7m(Gh  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) H>X:#xOA_  
{ 1 Qln|b8<  
 if(pMsg -> message == WM_KEYDOWN) zt6GJ z1q  
 { Kqm2TMO]>V  
  if(pMsg -> wParam == VK_ESCAPE) y2KR^/LN|Y  
   return TRUE; @kd`9Yw  
  if(pMsg -> wParam == VK_RETURN) :>f}rq  
   return TRUE; /@ m]@  
 } -V7dSi  
 return CDialog::PreTranslateMessage(pMsg); /V0[Urc@  
} wt]onve}%  
Z ):q1:y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) MR}=tO  
{ ~7ZWtg;B  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \8g'v@$wG  
  SaveBmp(); VX0}x+LJ  
  return FALSE; L xP%o  
} Y'*oW+K  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &.F ]-1RN[  
 CMenu pop; Xh+;$2l.B  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Q WcQtM  
 CMenu*pMenu=pop.GetSubMenu(0); Zjd9@  
 pMenu->SetDefaultItem(ID_EXITICON); R.(PZCvS  
 CPoint pt; A`71L V%  
 GetCursorPos(&pt); fN&@y$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;Nk,bb K  
 if(id==ID_EXITICON) |0OY> 5  
  DeleteIcon(); |h%=a8  
 else if(id==ID_EXIT) 5X&Y~w,poU  
  OnCancel(); 2u Zb2O  
 return FALSE; _0}u0fk  
} Ogv9_ X8  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ?.Q$@Ih0  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {>g{+Eq  
 AddIcon(); ia@ |+r  
 return res; Z-:T')#Cf  
} gWQ(B  
Q<0X80w>  
void CCaptureDlg::AddIcon() > 9.%hSy  
{ V_zU?}lZ^  
 NOTIFYICONDATA data; V/`vX;%  
 data.cbSize=sizeof(NOTIFYICONDATA); jh(T?t$&  
 CString tip; jIEntk  
 tip.LoadString(IDS_ICONTIP); 7>"dc+Fg  
 data.hIcon=GetIcon(0); /g$G G9  
 data.hWnd=GetSafeHwnd(); L>LIN 1A  
 strcpy(data.szTip,tip); U$|q]N  
 data.uCallbackMessage=IDM_SHELL; e.\dqt~%y  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <p/zm}?')  
 data.uID=98; DG?g~{Y~b  
 Shell_NotifyIcon(NIM_ADD,&data); t'1g+g  
 ShowWindow(SW_HIDE); Qo32oT[DM  
 bTray=TRUE; ,BUrZA2\U$  
} 1oe,>\\  
>dx/k)~~-L  
void CCaptureDlg::DeleteIcon() `*6|2  
{ [;H-HpBaa  
 NOTIFYICONDATA data; {7jl) x3l  
 data.cbSize=sizeof(NOTIFYICONDATA); hjyM xg;Q?  
 data.hWnd=GetSafeHwnd(); By waD?  
 data.uID=98; "}MP{/  
 Shell_NotifyIcon(NIM_DELETE,&data); {]2^b)  
 ShowWindow(SW_SHOW); 47N,jVt4  
 SetForegroundWindow(); _K}q%In  
 ShowWindow(SW_SHOWNORMAL); nrHC;R.nE  
 bTray=FALSE; aq)g&.dw?  
} DkX^b:D*f  
s_  t/  
void CCaptureDlg::OnChange() C~egF=w  
{ ? X6M8`  
 RegisterHotkey(); r0!')?#Z  
} f0vO(@I  
l^Ob60)2  
BOOL CCaptureDlg::RegisterHotkey() 793 15A  
{ 3CgID6[Sy  
 UpdateData(); 1Y87_o'd  
 UCHAR mask=0; u?" ="-^  
 UCHAR key=0; e8rZP(g&g  
 if(m_bControl) <pfl>Uf  
  mask|=4; +: x[cK  
 if(m_bAlt) EjL]#,QR  
  mask|=2; [0EWIdT*b  
 if(m_bShift) =* G3Khz!  
  mask|=1; D%~tU70a  
  key=Key_Table[m_Key.GetCurSel()]; 7mq&]4-G  
 if(bRegistered){ m^!:n$  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 4j~q,# $LW  
  bRegistered=FALSE; ~n- Px)  
 } XVkw/ l  
 cMask=mask; N"}>);r  
 cKey=key; Xf_#O'z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Kf1J;*i|\  
 return bRegistered; ele@xl  
} <Xl#}6II  
%ggf|\ -e  
  四、小结 P&sWn?q Ol  
)w0x{_  
  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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