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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: y6$a:6  
  OLx;j+p  
  一、实现方法 }ILBX4c  
:W)lt28_  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: Zf$mwRS[_  
:Racu;xf  
#pragma data_seg("shareddata") 3eUi9_s+  
HHOOK hHook =NULL; //钩子句柄 )<QX2~m<  
UINT nHookCount =0; //挂接的程序数目 >#h,q|B  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Yi9Y`~J  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ef'kG"1  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [[[C`H@  
static int KeyCount =0; 2bCfY\k  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 hJSvx  
#pragma data_seg() .i;.5)shsu  
Z66Xj-o  
  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。 `oMZ9Gq2E  
QvbH " 7  
  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: "}X+vd``  
/4+L2O[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR "nz\YQdg  
cKey,UCHAR cMask) r5gqRh}+  
{ '-"[>`[q  
 BOOL bAdded=FALSE; Z` kVyuQ  
 for(int index=0;index<MAX_KEY;index++){ g%J\YRo  
  if(hCallWnd[index]==0){ OG{*:1EP  
   hCallWnd[index]=hWnd; |Ua);B~F  
   HotKey[index]=cKey; r 1HG$^  
   HotKeyMask[index]=cMask; b}(c'W*z%  
   bAdded=TRUE; 4rDV CXE  
   KeyCount++; Tv#d>ZSD  
   break; S:{xx`6K  
  } k;cIEEdZD  
 } oLkzLJ  
 return bAdded; Ys.GBSlHG  
} T @^ S:K  
//删除热键 @:im/SE  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) fln[Q2zl  
{ Z,p@toj'  
 BOOL bRemoved=FALSE; _p"u~j~%-  
 for(int index=0;index<MAX_KEY;index++){ ^Zvb3RJg  
  if(hCallWnd[index]==hWnd){ G+fo'ThG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Z'A 3\f   
    hCallWnd[index]=NULL; a( ~X  
    HotKey[index]=0; u"zR_CzYc  
    HotKeyMask[index]=0; Hya.OW{  
    bRemoved=TRUE; -0xo6'mD  
    KeyCount--; a;bmlV04  
    break; 4Q#{,y944  
   } yR~$i3Z*  
  } ~0+<-T  
 } _# Hd2h  
 return bRemoved; >NPK;Vu  
} n><ad*|MX  
k5>UAea_  
+8xT}mX  
  DLL中的钩子函数如下: 48z%dBmTT*  
o6^ETQ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \5tG>>c i  
{ 3XB`|\:  
 BOOL bProcessed=FALSE; >!qtue7B  
 if(HC_ACTION==nCode) Cgln@Rz  
 { G(?1 Urxi  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 dfAw\7v/  
   switch(wParam) l1kHFeq  
   {  v6G1y[Wl  
    case VK_MENU: W;8A{3q%N0  
     MaskBits&=~ALTBIT; ea O'|@;{~  
     break; 9_==C"F  
    case VK_CONTROL: 1?w=v|b:P)  
     MaskBits&=~CTRLBIT; XzIC~}  
     break; i`52tH y_  
    case VK_SHIFT: MtwlZg`c3  
     MaskBits&=~SHIFTBIT; :@5{*o  
     break; =^p}JhQ  
    default: //judge the key and send message E5A"sB   
     break; 3f$n8>mq  
   } s#<fj#S  
   for(int index=0;index<MAX_KEY;index++){ t{B@k[|  
    if(hCallWnd[index]==NULL) dSKvs"  
     continue; 5s\;7>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) :LB*l5\  
    { ~)#E?:h5  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); LK4NNZf7  
     bProcessed=TRUE; &u^]YE{  
    } x~uDCbL  
   } 3=U#v<  
  } >o13?-S%e  
  else if((lParam&0xc000ffff)==1){ //有键按下 ELV~ ayp5  
   switch(wParam) wZ0bD&B  
   { YJ6:O{AL1  
    case VK_MENU: wEq&O|Vj  
     MaskBits|=ALTBIT; U]+IP;YS  
     break; L8n?F#q  
    case VK_CONTROL: @r[SqGa:  
     MaskBits|=CTRLBIT; mW{uChHP  
     break; $,O8SW.O$  
    case VK_SHIFT: &\ca ? #  
     MaskBits|=SHIFTBIT; Z,AY<[/C  
     break; lO|LvJyx  
    default: //judge the key and send message y+Nw>\|S  
     break; 1p5'.~J+Q  
   } &HLG<ISw  
   for(int index=0;index<MAX_KEY;index++){ D1+1j:m  
    if(hCallWnd[index]==NULL) L|<j/bP  
     continue; b 1.S21  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) L_9uwua.B~  
    { Fs~*-R$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); x>mI$K(6M  
     bProcessed=TRUE; wQhuU  
    } \15'~ ]d  
   } g]JJ!$*1  
  } 4".I*ij  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 r [^.\&-  
   for(int index=0;index<MAX_KEY;index++){ ._>03,"  
    if(hCallWnd[index]==NULL) u0<yGsEGD  
     continue; |AE{rvP{@  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) @D*PO-s9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); #b&tNZ4!_  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 pam9wfP  
   } .3UJ*^(?  
  } I74Rw*fB  
 } Y|b,pC|,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *w. ":\P]  
} 49>b]f,Vc  
\"RCJadK  
  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: XXX y*/P  
ld#x'/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M]k Q{(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); xMQ>,nZ  
%{IgY{X  
  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: # "c'eG0  
rZ+4kf6S   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) #wT6IU1  
{ x&J\swN9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) KwMt@1Z  
 { Fhllqh)  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 k7@QFw4 j  
  SaveBmp(); ]=ApYg7!  
  return FALSE; @=AQr4&  
 } Vb#a ,t  
 …… //其它处理及默认处理 At<MY`ka  
} )M"NMUuU"  
e<{ d{  
,J+L_S+B~  
  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。 9XQE5^  
W+u,[_  
  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。 6&'kN 2  
wXp:XZ:]T  
  二、编程步骤 !pRu?5  
?[bE/Ya+S  
  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"; NTX0vQG  
kl~/tbf  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; yU/?4/G!  
h*y+qk-!\g  
  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; $Yu'B_E6p  
{*n<A{$[ m  
  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; [G|(E  
B%u[gNZ  
  5、 添加代码,编译运行程序。 ed5oN^V.<  
_3%:m||,XP  
三、程序代码 JAjiG^]  
?kZ-,@h:  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 3^&`E} r  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) f{L;,  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 2`;XcY4A  
#if _MSC_VER > 1000 ~vpF|4Zn5  
#pragma once *2~WP'~PQd  
#endif // _MSC_VER > 1000 *XWu)>*o  
#ifndef __AFXWIN_H__ <X{w^ cT_Q  
#error include 'stdafx.h' before including this file for PCH KI#v<4C$P  
#endif >Q(\vl@N=  
#include "resource.h" // main symbols ) YwEl72c  
class CHookApp : public CWinApp .H M3s  
{ `$JZJ!,A  
 public: O SUiS`k  
  CHookApp(); k0\a7$}F  
  // Overrides xWa[qCr  
  // ClassWizard generated virtual function overrides saZK+kD4I  
  //{{AFX_VIRTUAL(CHookApp) q[P>s{"  
 public: dVMl;{  
  virtual BOOL InitInstance(); Ca?w"m~h  
  virtual int ExitInstance(); fX,O9d$  
  //}}AFX_VIRTUAL "WGKwi=W  
  //{{AFX_MSG(CHookApp) la)+"uW  
  // NOTE - the ClassWizard will add and remove member functions here. M^HYkXn[  
  // DO NOT EDIT what you see in these blocks of generated code ! [3S17tTc3  
  //}}AFX_MSG yp=sL' E  
  DECLARE_MESSAGE_MAP() X#0yOSR  
}; 5M'cOJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 9cN@y<_I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $4ZV(j]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tFn[U#'  
BOOL InitHotkey(); =Oh$pZRymu  
BOOL UnInit(); "8z Me L  
#endif Si~wig2  
ljrJC  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. #k>n5cR@0  
#include "stdafx.h" rmvrv.$3  
#include "hook.h" ZW"f*vwQo  
#include <windowsx.h> : Gi8Jo  
#ifdef _DEBUG ":/Vp,g  
#define new DEBUG_NEW am.d^'  
#undef THIS_FILE ;}S_PnwC@  
static char THIS_FILE[] = __FILE__; k 75 p  
#endif CpX[8>&osD  
#define MAX_KEY 100 {P?DkUO}  
#define CTRLBIT 0x04 t xnH~;(  
#define ALTBIT 0x02 t'W6Fmwkx  
#define SHIFTBIT 0x01 B[8 RBTsA  
#pragma data_seg("shareddata") 8R\6hYJ%F  
HHOOK hHook =NULL; [D+PDR  
UINT nHookCount =0; GFbn>dY  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 5lzbg   
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT B3[X{n$px  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey :$yOic}y  
static int KeyCount =0; }2BNy9q@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift .@mZG<vg  
#pragma data_seg() s/~[/2[bnf  
HINSTANCE hins; x7l}u`N4  
void VerifyWindow(); Dqwd=$2%  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) }>y~P~`S:  
//{{AFX_MSG_MAP(CHookApp) .uX(-8n ~  
// NOTE - the ClassWizard will add and remove mapping macros here. ~v/` `s  
// DO NOT EDIT what you see in these blocks of generated code! (kK8 OxfF  
//}}AFX_MSG_MAP j&A9 &+w  
END_MESSAGE_MAP() Fv/{)H<:y  
(qc <'$o  
CHookApp::CHookApp() a>8] +@  
{ &l{ctP%q  
 // TODO: add construction code here, leizjL\P  
 // Place all significant initialization in InitInstance y<`:I|y  
} $ <[r3  
;*Y+.?>a  
CHookApp theApp; 5gx;Bp^_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *)\y52z  
{ 5$Kv%U  
 BOOL bProcessed=FALSE; x3 Fn'+  
 if(HC_ACTION==nCode) GP ^^ K  
 { loq2+(  
  if((lParam&0xc0000000)==0xc0000000){// Key up %(? ;`  
   switch(wParam) vft7-|8T  
   { &];W#9"Z  
    case VK_MENU: #|:q"l9  
     MaskBits&=~ALTBIT; #X!seQ7a  
     break; *}(B"FSO  
    case VK_CONTROL: z:dW'U?1  
     MaskBits&=~CTRLBIT; Ug gg!zA  
     break; @{<^rLt  
    case VK_SHIFT: n~w[ajC/  
     MaskBits&=~SHIFTBIT; 4T)`%Oo<}  
     break; +\PLUOk  
    default: //judge the key and send message *$('ous8  
     break; yswf2F  
   } V*%><r  
   for(int index=0;index<MAX_KEY;index++){ 1)N#  
    if(hCallWnd[index]==NULL) LG("<CU  
     continue; vPy."/[u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yMgS0  
    { \!>qtFT  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9dp4&&Z+F  
     bProcessed=TRUE; 2ss*&BR.  
    }  mSFA i  
   } 9a1R"%Z  
  } \)MzUOZn  
  else if((lParam&0xc000ffff)==1){ //Key down Esj1Vv#  
   switch(wParam) ^q}phj3E  
   { &;vMJ   
    case VK_MENU: )T(1oK(g  
     MaskBits|=ALTBIT;  V2 ;?  
     break; sFgsEKs  
    case VK_CONTROL: -"N vu  
     MaskBits|=CTRLBIT; X1u\si%.4S  
     break; \4OU+$m  
    case VK_SHIFT: h2+"e# _  
     MaskBits|=SHIFTBIT; eVbT<9k  
     break; e5n"(s"G*[  
    default: //judge the key and send message U?:?NC=1{  
     break; FB~IO#E8W  
   } a(`"qS  
   for(int index=0;index<MAX_KEY;index++) ?FZ) LZM  
   { Qq.Ja%Zq  
    if(hCallWnd[index]==NULL) 5]3Mj*u\  
     continue; uD4W@*PYr  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) +- hfl/$  
    { -7I %^u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6LT.ng  
     bProcessed=TRUE; bSTTr<W  
    } z=rSb4"W  
   } >8`;SEnv  
  } 3?&P^{  
  if(!bProcessed){ %~Wr/TOt+  
   for(int index=0;index<MAX_KEY;index++){ !i{5mc \  
    if(hCallWnd[index]==NULL) [RDY(}P%  
     continue; V )oKsO  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) '?mky,:HT  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); @_#]7  
   } )o::~ eu  
  } u@4khN: ^p  
 } b|.<rV'BTt  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); B-$ps=G+z  
} }qhND-9#@  
cdL0<J b,  
BOOL InitHotkey() |Yi_|']#  
{ \&v)#w  
 if(hHook!=NULL){ "t>H B6^  
  nHookCount++; +5Y;JL<%/  
  return TRUE; d&DQ8Gm ^  
 } Hv =7+O$  
 else C8 $KVZ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [Z]CBEE  
  if(hHook!=NULL) ~.S/<:`U  
   nHookCount++; $|19]3T@Z  
  return (hHook!=NULL); D<^K7tJui  
} r)dXcus  
BOOL UnInit() 3e;ux6  
{ $h1pL>^J  
 if(nHookCount>1){ '81WogH:  
  nHookCount--; V:8{MO(C\  
  return TRUE; C^ ~[b o  
 } n1y*`5!  
 BOOL unhooked = UnhookWindowsHookEx(hHook); wqt/0,\  
 if(unhooked==TRUE){ )aX#RM? N  
  nHookCount=0; @Wzr rCpj  
  hHook=NULL;  pm*i!3g'  
 } S^SF!k=  
 return unhooked; `{nzw$  
} ~=Fp0l)#  
Rdy-6  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B,{Q[  
{ ^F+7@*u  
 BOOL bAdded=FALSE; 1KI5tf>>p  
 for(int index=0;index<MAX_KEY;index++){ p xQh;w  
  if(hCallWnd[index]==0){ 1F[W~@jW  
   hCallWnd[index]=hWnd; 8ao>]5Rs3  
   HotKey[index]=cKey; ztaSIMZ  
   HotKeyMask[index]=cMask; ^ Mq8jw(2  
   bAdded=TRUE; P)06<n1">Z  
   KeyCount++; %T~LK=m  
   break; +?C7(-U>  
  } N6/;p]|  
 } wg KM6?  
 return bAdded; $"{I| UFC  
} ^cI RP  
@9h6D<?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [F^j(qTR  
{ lUM-~  
 BOOL bRemoved=FALSE; J<ZG&m362p  
 for(int index=0;index<MAX_KEY;index++){ /h K/t;  
  if(hCallWnd[index]==hWnd){ iaQ3mk#  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2NWQiSz  
    hCallWnd[index]=NULL; R-BN}ZS  
    HotKey[index]=0; m)xz_Plc  
    HotKeyMask[index]=0; !;&{Q^}  
    bRemoved=TRUE; MZ <BCRB  
    KeyCount--; (L7%V !  
    break; M}!E :bv'  
   } R"{oj]d;$F  
  } ,) 3Eog\-  
 } 0d #jiG  
 return bRemoved; EceD\}  
} YR0.m%U,  
x`zE#sD  
void VerifyWindow() kwpbgQ  
{ G/_9!lE  
 for(int i=0;i<MAX_KEY;i++){ SHUn<+/e  
  if(hCallWnd!=NULL){ Nvj KB)J  
   if(!IsWindow(hCallWnd)){ zFO#oW,D  
    hCallWnd=NULL; ]*yUb-xY  
    HotKey=0; j{H,{x  
    HotKeyMask=0;  u~j&g  
    KeyCount--; aumM\rY  
   } ,V # r  
  } ey) 8q.5  
 } $ud\CU:r  
} "I&,':O+  
PQ4)kVT  
BOOL CHookApp::InitInstance() n~v*  
{ Q`(h  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); #TG.weTC  
 hins=AfxGetInstanceHandle(); FK`M+ j  
 InitHotkey(); S1d{! ` 3  
 return CWinApp::InitInstance(); , Y cF~  
} C_V5.6T!  
5,K*IH  
int CHookApp::ExitInstance() Q`(.Blgm;  
{ V=5v7Y3( j  
 VerifyWindow(); Qon>[<]B  
 UnInit(); HT=-mwa_]  
 return CWinApp::ExitInstance(); :P2 0g](  
} bRK[u\,  
N#4"P: Sv  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file rn%q*_3-o  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) WRfhxl  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 3^p;'7x  
#if _MSC_VER > 1000 ]ZM-c~nL  
#pragma once |j~{gfpSE  
#endif // _MSC_VER > 1000 h<IPV'1  
)+ 12r6W  
class CCaptureDlg : public CDialog `ouCQ]tKz  
{ Nd61ns(N  
 // Construction 5vqh09-FB  
 public: >Gi* BB  
  BOOL bTray; z)]Br1  
  BOOL bRegistered; Id 40yER  
  BOOL RegisterHotkey(); {,zn#hU.R  
  UCHAR cKey; PitDk 1T  
  UCHAR cMask; ^WmP,Xf#  
  void DeleteIcon(); #H/suQZN"g  
  void AddIcon(); w]Z:Y`  
  UINT nCount; IRB BLXv7\  
  void SaveBmp(); }C9P--  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor g)Dg=3+>  
  // Dialog Data Sv|jR r'  
  //{{AFX_DATA(CCaptureDlg) '7/c7m/$X<  
  enum { IDD = IDD_CAPTURE_DIALOG }; W)m\q}]FYz  
  CComboBox m_Key; -4nSiI  
  BOOL m_bControl; vHxLn/  
  BOOL m_bAlt; Q a8;MxK`  
  BOOL m_bShift; EZg$mp1  
  CString m_Path; \}+b_J6-  
  CString m_Number; .z&,d&E  
  //}}AFX_DATA t{Xf3.  
  // ClassWizard generated virtual function overrides 4Q n5Mr@<  
  //{{AFX_VIRTUAL(CCaptureDlg) C9%2}E3Z$)  
 public: QPT%CW61M  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  N2Q%/}+,  
 protected: x*2I]4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support i4^1bd  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); yUp"%_t0  
  //}}AFX_VIRTUAL <c$K3  
  // Implementation *Z C$DW!-  
 protected: !Xf7RT  
  HICON m_hIcon; bO\E)%zp  
  // Generated message map functions -x0VvkHu  
  //{{AFX_MSG(CCaptureDlg) m*Q*{M_e  
  virtual BOOL OnInitDialog(); Fy-N U  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); P gK> Z,  
  afx_msg void OnPaint(); Y;OqdO  
  afx_msg HCURSOR OnQueryDragIcon(); BARs1^pR4  
  virtual void OnCancel(); DQRr(r~2Kj  
  afx_msg void OnAbout(); yi$Jk}w  
  afx_msg void OnBrowse(); ohj(1jt  
  afx_msg void OnChange(); |B/A)(c yV  
 //}}AFX_MSG [[ ;vZ  
 DECLARE_MESSAGE_MAP() ?wQaM3 |^:  
}; =`%"-A  
#endif [W{WfJ-HwG  
q]>m#yk   
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  (:ObxJ*  
#include "stdafx.h" @#= ail  
#include "Capture.h" ^J{tOxO=l  
#include "CaptureDlg.h" 1pT-PO 3=  
#include <windowsx.h> iF1E 5{dH  
#pragma comment(lib,"hook.lib") "<5su5]  
#ifdef _DEBUG -^+!:0';  
#define new DEBUG_NEW NT}r6V(Aju  
#undef THIS_FILE ~99DE78  
static char THIS_FILE[] = __FILE__; :M'V**A(  
#endif u#uT|a.  
#define IDM_SHELL WM_USER+1 F1aI4H<(T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %qj8*1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X=U>r  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; g<&n V>wF  
class CAboutDlg : public CDialog -p\uW 0XA  
{ }HC6m{vH(  
 public: +{F2hEYP  
  CAboutDlg(); 6~_ TXy/  
  // Dialog Data FG[YH5  
  //{{AFX_DATA(CAboutDlg) bQFMg41*w7  
  enum { IDD = IDD_ABOUTBOX }; I"1H]@"=  
  //}}AFX_DATA mcB8xE  
  // ClassWizard generated virtual function overrides /9..hEq^  
  //{{AFX_VIRTUAL(CAboutDlg) NiCB.a  
 protected: drc]"6 k  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7-u['nFJ  
  //}}AFX_VIRTUAL q!+&|F  
  // Implementation L 2k?Pl  
 protected: C_~hX G  
  //{{AFX_MSG(CAboutDlg) X|iWnz+^  
  //}}AFX_MSG V<%eWT)x7C  
  DECLARE_MESSAGE_MAP() @CJ`T&  
};  edv&!  
V`/D!8>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) FhkS"y  
{ $x'p+&n\  
 //{{AFX_DATA_INIT(CAboutDlg) [hl8LP+~  
 //}}AFX_DATA_INIT sKK*{+,kh;  
} =T0;F0@#4  
] s))O6^f  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) l,n V*Z  
{ bXw!fYm&  
 CDialog::DoDataExchange(pDX); [~[)C]-=  
 //{{AFX_DATA_MAP(CAboutDlg) RZg8y+jM  
 //}}AFX_DATA_MAP 5!pof\/a  
} tDk!]  
wVms"U.  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^UEExj f  
 //{{AFX_MSG_MAP(CAboutDlg) v==b. 2=  
 // No message handlers {-fhp@;  
 //}}AFX_MSG_MAP d}2$J1`  
END_MESSAGE_MAP() wG\ +C'&~  
Wu!s  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !iO%?nW;  
: CDialog(CCaptureDlg::IDD, pParent) 6yN8 (&`  
{ SZhW)0  
 //{{AFX_DATA_INIT(CCaptureDlg) #2~-I  
  m_bControl = FALSE; )*wM DM5q  
  m_bAlt = FALSE; E1&9( L5  
  m_bShift = FALSE; 4%s6 d,6"  
  m_Path = _T("c:\\"); p]-\\o}  
  m_Number = _T("0 picture captured."); 7|/Ct;oO:  
  nCount=0; f=L&>X  
  bRegistered=FALSE; Q*J8`J:#^R  
  bTray=FALSE; ~5Cid)Q}@o  
 //}}AFX_DATA_INIT &Is}<Ew  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &*4C{N  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); VoTnm   
} bz1+AJG  
kU {>hG4  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 5@kNvi  
{ oXxY$x*R1  
 CDialog::DoDataExchange(pDX); \[57Dmo  
 //{{AFX_DATA_MAP(CCaptureDlg) ls9 28  
  DDX_Control(pDX, IDC_KEY, m_Key); |v6kZ0B<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3m#/1=@o  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ^z%ShmM&LZ  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); b,tf]Z-  
  DDX_Text(pDX, IDC_PATH, m_Path); Ww[Xqmg  
  DDX_Text(pDX, IDC_NUMBER, m_Number); P,}cH;w6Ck  
 //}}AFX_DATA_MAP fUg<+|v*  
} 5>e#SW  
DQ86(4e*g#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ,_N+t:*#0  
//{{AFX_MSG_MAP(CCaptureDlg) pmIOV~K  
 ON_WM_SYSCOMMAND() {|E'  
 ON_WM_PAINT() 7^2  
 ON_WM_QUERYDRAGICON() \@}G'7{  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) fy6<KEea  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) NZTG)<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) UCz\SZ{za  
//}}AFX_MSG_MAP }^@Q9<P^E  
END_MESSAGE_MAP() t{ R\\j  
nsM=n}$5x  
BOOL CCaptureDlg::OnInitDialog() iiw\  
{ y$Rr,]L  
 CDialog::OnInitDialog(); $Sx(vq6(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); /~O>He  
 ASSERT(IDM_ABOUTBOX < 0xF000); j^V r!y  
 CMenu* pSysMenu = GetSystemMenu(FALSE); @X?7a]+;8  
 if (pSysMenu != NULL) OABMIgX  
 { ?DwI>< W  
  CString strAboutMenu; p" ;5J+?(  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 'BiR ,M$mY  
  if (!strAboutMenu.IsEmpty()) =Lc!L !(,b  
  { Hrk]6*  
   pSysMenu->AppendMenu(MF_SEPARATOR); \|gE=5!Am=  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); z[0+9=<Y  
  } )43\qIu\  
 } Y_gMoo  
 SetIcon(m_hIcon, TRUE); // Set big icon @BfJb[A#  
 SetIcon(m_hIcon, FALSE); // Set small icon :< d.  
 m_Key.SetCurSel(0); I0qS x{K  
 RegisterHotkey(); RnaxRnXVR  
 CMenu* pMenu=GetSystemMenu(FALSE); J2BCaAwEP,  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); XsXO S8  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <?>1eU%  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); nc2=S^Fqu  
 return TRUE; // return TRUE unless you set the focus to a control 9*&c2jh  
} /TndB7l"3  
[XKudw%  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) t4P`#,:8  
{ xk:=.Qqh  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'e(]woe  
 { T) Zef  
  CAboutDlg dlgAbout; ' a>YcOw  
  dlgAbout.DoModal(); )-s9CWJv  
 } cs]h+yE  
 else pK|~G."6e  
 { 2A95vC'u>|  
  CDialog::OnSysCommand(nID, lParam); u^4$<fd  
 } (2J\o  
} JqmxS*_P  
n6xJ  
void CCaptureDlg::OnPaint() vH?rln  
{ {O=PVW2S  
 if (IsIconic()) ;(3!#4`q(]  
 { )z^NJ'v4(  
  CPaintDC dc(this); // device context for painting lZr}F.7  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); w!eY)p<  
  // Center icon in client rectangle (6crWw{3  
  int cxIcon = GetSystemMetrics(SM_CXICON); */6lyODf  
  int cyIcon = GetSystemMetrics(SM_CYICON); +L,V_z  
  CRect rect; +7KRoF|  
  GetClientRect(&rect); * @=ZzL  
  int x = (rect.Width() - cxIcon + 1) / 2; x##0s5Qn  
  int y = (rect.Height() - cyIcon + 1) / 2; Uk'bOp  
  // Draw the icon 1s_N!a  
  dc.DrawIcon(x, y, m_hIcon); P U2^4h/[`  
 } 0#S#v2r5  
 else _m.w5nJ  
 { ;Zy[2M  
  CDialog::OnPaint(); q21l{R{Y  
 } QMhvyzkS  
} 5<>"d :9  
^ 7SE2Zi  
HCURSOR CCaptureDlg::OnQueryDragIcon() T! ww3d  
{ >\o._?xSA  
 return (HCURSOR) m_hIcon; Ab In\,x  
} YW2h#PV6_  
FPE%h =sw  
void CCaptureDlg::OnCancel() Q3I^(Ll"L  
{ 2;w`W58  
 if(bTray) S?[@/35)  
  DeleteIcon(); 7C9_;81_Dt  
  CDialog::OnCancel(); /os,s[w  
} } 3}H}  
zMXQfR   
void CCaptureDlg::OnAbout() |[Rlg`TQ;*  
{ SaIY-PC  
 CAboutDlg dlg; `tPVNO,l  
 dlg.DoModal(); 6Qk[TL)t  
} l86gs6>  
DS1{~_>nFu  
void CCaptureDlg::OnBrowse() ]SmN}Iq1  
{ Miz?t*|{[  
 CString str; ;O7Vl5R  
 BROWSEINFO bi; i*((@:  
 char name[MAX_PATH]; #M)+sK$H%f  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); "U-dw%b}b  
 bi.hwndOwner=GetSafeHwnd(); }0Ie Kpu5  
 bi.pszDisplayName=name; 0T7t.  
 bi.lpszTitle="Select folder"; #\8"d  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; k2O3{xIjc  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 4l`[,BJ  
 if(idl==NULL) =/!RQQ|8o  
  return; !pZ<{|cH  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); '.wb= C  
 str.ReleaseBuffer(); q-s(2C  
 m_Path=str; `=$p!H8  
 if(str.GetAt(str.GetLength()-1)!='\\') i IM\_<?  
  m_Path+="\\"; ek"U q RY  
 UpdateData(FALSE); zP&D  
} tv_&PIu]L  
mxE<  
void CCaptureDlg::SaveBmp() 5P{[8PZxbV  
{ cLf<YF  
 CDC dc; `W:z#uNG]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); bC /Ql  
 CBitmap bm; 8'"=y}]H~  
 int Width=GetSystemMetrics(SM_CXSCREEN); tZG l^mA"g  
 int Height=GetSystemMetrics(SM_CYSCREEN); N%F4ug@i   
 bm.CreateCompatibleBitmap(&dc,Width,Height); suS[P?4  
 CDC tdc; PJ YUD5  
 tdc.CreateCompatibleDC(&dc); wF9L<<&B  
 CBitmap*pOld=tdc.SelectObject(&bm); O 6ph_$nt.  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); [MuZ^'dR  
 tdc.SelectObject(pOld); ?t5<S]'r$  
 BITMAP btm; UqD ]@s`  
 bm.GetBitmap(&btm); /i~x.i3  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; zI0d  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); S Rk%BJ? ~  
 BITMAPINFOHEADER bih; Ci4; e  
 bih.biBitCount=btm.bmBitsPixel; U&ytZ7iB  
 bih.biClrImportant=0; #jh5%@  
 bih.biClrUsed=0; THlQifA!  
 bih.biCompression=0; {;N2 &S o  
 bih.biHeight=btm.bmHeight; s"XwO8yhM  
 bih.biPlanes=1; fy$?~Ji &  
 bih.biSize=sizeof(BITMAPINFOHEADER); Eq%f`Qg+1E  
 bih.biSizeImage=size; ^ L]e]<h(  
 bih.biWidth=btm.bmWidth; ]q~bi<E9W  
 bih.biXPelsPerMeter=0; U\u07^h[  
 bih.biYPelsPerMeter=0; ez5J+  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); B Dp")[l  
 static int filecount=0; -p?&vQDo`  
 CString name; CBv0fQtL  
 name.Format("pict%04d.bmp",filecount++); PXyv);#Q`  
 name=m_Path+name; Ze[,0Y!u&  
 BITMAPFILEHEADER bfh; *4e?y  
 bfh.bfReserved1=bfh.bfReserved2=0; \1SC:gN*#  
 bfh.bfType=((WORD)('M'<< 8)|'B'); i),bAU!+m  
 bfh.bfSize=54+size; 'J$@~P  
 bfh.bfOffBits=54; 9GRQ^E  
 CFile bf; eyuyaSE  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ):_@i  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); e=nvm'[h  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); q|:wzdmNZ  
  bf.WriteHuge(lpData,size); 19U&4Jk  
  bf.Close(); Ta[\BWR2  
  nCount++; )3)7zulnXH  
 } L+*:VP6WD  
 GlobalFreePtr(lpData); hbg$u$1`,  
 if(nCount==1) /wax5FS'I,  
  m_Number.Format("%d picture captured.",nCount); @H<*|3J  
 else ' '(rC38  
  m_Number.Format("%d pictures captured.",nCount); u>]3?ty`  
  UpdateData(FALSE); jo^c>ur  
} |Iwglb!k  
|lcp (u*u  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ="5D}%  
{ c6lCF &  
 if(pMsg -> message == WM_KEYDOWN) <=V{tl  
 { `KN>0R2k  
  if(pMsg -> wParam == VK_ESCAPE) O5aXa_A_u  
   return TRUE; @gfW*PNjlP  
  if(pMsg -> wParam == VK_RETURN)  4=ovm[  
   return TRUE; ,zdGY]$  
 } i!RfUod  
 return CDialog::PreTranslateMessage(pMsg); lm 96:S  
} S2e3d  
_3:%b6&Pz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]'"Sa<->  
{ 641P)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 71y{Dwya  
  SaveBmp(); l -xc*lC  
  return FALSE; x1?mE)n]  
} _U}vKm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .1q}mw   
 CMenu pop; hHhDs>tB  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); p#{y9s4h  
 CMenu*pMenu=pop.GetSubMenu(0); J8!2Tt  
 pMenu->SetDefaultItem(ID_EXITICON); {x?qz~W  
 CPoint pt; p0WUF\"  
 GetCursorPos(&pt); Q3(ulgl]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @,n)1*{P  
 if(id==ID_EXITICON) ol*,&C:{  
  DeleteIcon(); D;NL*4zt  
 else if(id==ID_EXIT) *g,ls(r\[  
  OnCancel(); +8C }%6aX  
 return FALSE; Z[OX {_2]K  
} PMpq>$6b7  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 0F@~[W|2  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) W} i6{ Vh  
 AddIcon(); F_(~b  
 return res; s*[ I"iE  
} .whi0~i  
uE41"?GS  
void CCaptureDlg::AddIcon() ]c~yMA+]FZ  
{ Uffwzd!  
 NOTIFYICONDATA data; *d3-[HwZCL  
 data.cbSize=sizeof(NOTIFYICONDATA); NJQ)Ttt  
 CString tip; D>[Sib/@  
 tip.LoadString(IDS_ICONTIP); "qNFDr(WM  
 data.hIcon=GetIcon(0); Jz~:  
 data.hWnd=GetSafeHwnd(); !9WGZfK+0Y  
 strcpy(data.szTip,tip); 4hy -M>!D|  
 data.uCallbackMessage=IDM_SHELL; ;_vhKU)%J#  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; 9e=}P L  
 data.uID=98; L?j0t*do  
 Shell_NotifyIcon(NIM_ADD,&data); Bd <0}  
 ShowWindow(SW_HIDE); P*A+k"DU1  
 bTray=TRUE; Yu\$Y0 {]  
} N?ccG\t  
s`_EkFw>Gl  
void CCaptureDlg::DeleteIcon() aL4^ po  
{ rP3tFvOH  
 NOTIFYICONDATA data; &U7v=a  
 data.cbSize=sizeof(NOTIFYICONDATA); 7%i'F=LzT  
 data.hWnd=GetSafeHwnd(); hqvhnqQk  
 data.uID=98; :31_WJ^  
 Shell_NotifyIcon(NIM_DELETE,&data); 12z!{k7N  
 ShowWindow(SW_SHOW); J`U]Ux/L  
 SetForegroundWindow(); !:!(=(4$P  
 ShowWindow(SW_SHOWNORMAL); pE&G]ZC  
 bTray=FALSE; V ml 6\X  
} >) u;X  
D{6 y^@/  
void CCaptureDlg::OnChange() ?"mZb#%  
{ K2zln_W  
 RegisterHotkey(); ywAvqT,  
} (s,&,I=@  
KU,SAcfR7  
BOOL CCaptureDlg::RegisterHotkey() c$ !?4z_.  
{ Qc3d<{7\~  
 UpdateData(); 7K\v=  
 UCHAR mask=0; SG)Fk *1  
 UCHAR key=0; O~*i_t*i9{  
 if(m_bControl) miaH,hm  
  mask|=4; \Nt 5TG_  
 if(m_bAlt) K9#kdo1 2  
  mask|=2; Nn[*ox#i  
 if(m_bShift) |O_ JUl  
  mask|=1; ]ub"OsXC  
  key=Key_Table[m_Key.GetCurSel()]; R^.PKT2E  
 if(bRegistered){ &))d],tJX  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); YCD |lL#  
  bRegistered=FALSE; %]_: \!  
 } 7H Dc]&z  
 cMask=mask; o~~;I  
 cKey=key; $Y|OGZH8E  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); H%O\4V2s  
 return bRegistered; T]De{nHu  
} [7I bT:ph  
[f_^B U&  
  四、小结 O`~#X w  
OJcS%-~  
  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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