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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: =UI,+P:  
  L@gQ L  
  一、实现方法 ;PP_3`  
X]3l| D  
  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: =hZ&66  
P;HVLflu  
#pragma data_seg("shareddata") al3BWRq'f  
HHOOK hHook =NULL; //钩子句柄 +SZ%&  
UINT nHookCount =0; //挂接的程序数目 )V9Mcr*Ce6  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 l`~a}y"n  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Z>>gXh<e[  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 8|S1|t,  
static int KeyCount =0; ! 4qps$p{  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 p[af[!  
#pragma data_seg() :>AW@SoTp  
q:EzKrE  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 =:CGl   
h;4y=UU  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: P!)7\.7  
+7U  A%q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 'NG^HLD/  
cKey,UCHAR cMask) % +t  
{ m<,y-bQ*(  
 BOOL bAdded=FALSE; z1{E:~f  
 for(int index=0;index<MAX_KEY;index++){ ?:{0  
  if(hCallWnd[index]==0){ mCC:}n"#  
   hCallWnd[index]=hWnd; "2vNkO##  
   HotKey[index]=cKey; U 3wsWSO  
   HotKeyMask[index]=cMask; B4\:2hBq  
   bAdded=TRUE; qJbhPY8Ak  
   KeyCount++; [i<$ZP  
   break; ^cPo{xf  
  } F=*BvI "+  
 } }K#&5E  
 return bAdded; Y_Z &p#Q!  
} l?yZtZ8  
//删除热键 EE{#S  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )"i>R ~*  
{ "OS]\-  
 BOOL bRemoved=FALSE; k?|F0e_  
 for(int index=0;index<MAX_KEY;index++){ )=,9`+Zta  
  if(hCallWnd[index]==hWnd){ [X$|dOm'N  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 3 4A&LBwC  
    hCallWnd[index]=NULL; l b1sV  
    HotKey[index]=0; [6RV'7`Abj  
    HotKeyMask[index]=0; +*:x#$phx  
    bRemoved=TRUE; _I -0,  
    KeyCount--; 0%&fUz36E6  
    break; [6/%V>EM  
   } 'wT./&Z  
  } B 4*X0x  
 } 63y':g  
 return bRemoved; {%+3D,$)  
} 1Hk<_no5  
"z(fBnv  
*~t$k56  
  DLL中的钩子函数如下: u {E^<fW]  
*"wD& E?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f-f\}G&G  
{ }HA2c e\  
 BOOL bProcessed=FALSE; 43orR !.Z  
 if(HC_ACTION==nCode) t+4%,n f_1  
 { gS(: c .  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1 Q0Yer  
   switch(wParam) Ygkd~g  
   {  fXXm@tMx>  
    case VK_MENU: Cn./Naq  
     MaskBits&=~ALTBIT; h.s<0.  
     break; 9B6_eFb  
    case VK_CONTROL: ^v'g~+@o  
     MaskBits&=~CTRLBIT; x"C93ft[  
     break; BB73' W8y  
    case VK_SHIFT: te)g',#lT  
     MaskBits&=~SHIFTBIT; zm)CfEF 8  
     break; ^) b7m  
    default: //judge the key and send message WE Svkm;  
     break; 8L9S^ '  
   } D^R! |K/  
   for(int index=0;index<MAX_KEY;index++){ HNHhMi`w  
    if(hCallWnd[index]==NULL) |\r\i&|g1  
     continue; L+0N@`nRF  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l<)JAT;P  
    { zk^7gx3x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); FDGKMGZ  
     bProcessed=TRUE; /+JP~ K  
    } ]zM90$6  
   } -"JE-n  
  } )V+Dqh,-g  
  else if((lParam&0xc000ffff)==1){ //有键按下 :EldP,s#x%  
   switch(wParam) GF.g'wYc)Y  
   { ;xkf ?|  
    case VK_MENU: cdU >iB,  
     MaskBits|=ALTBIT; |#k hwH  
     break; )mo|.L0  
    case VK_CONTROL: $GfxMt  
     MaskBits|=CTRLBIT; [#@p{[?r  
     break; a~N)qYL:  
    case VK_SHIFT: NYV0<z@M2M  
     MaskBits|=SHIFTBIT; GL0':LsZ  
     break; { G>+.  
    default: //judge the key and send message Y @ ,e  
     break; ])ZJ1QL1  
   } BKjPmrZ|  
   for(int index=0;index<MAX_KEY;index++){ VT~ ^:-]  
    if(hCallWnd[index]==NULL) cB])A57<  
     continue; Sm I8&c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Hd@T8 D*A  
    { cJE>;a  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Xk fUPbU  
     bProcessed=TRUE; f.xSr!  
    } );.<Yf{c  
   } qaSv]k.  
  } 1p5q}">z  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 0#[Nfe*  
   for(int index=0;index<MAX_KEY;index++){ [.#$hOsNR  
    if(hCallWnd[index]==NULL) 'w$we6f  
     continue; b8-^wJH!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1nM?>j%k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ei(`gp  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 1~ZHC[ `  
   } By"ul:.D  
  } %$-3fj7  
 } HvfTC<+H  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); F9G$$%Q-Z  
} [~r $US  
HBkQ`T  
  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: _f2iz4  
,4I6RwB.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); l[j0(T  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Y?SJQhN6W  
oTa+E'q  
  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: NZ? =pfK\s  
E]Gq!fA&<  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;0}"2aGY  
{ Z"8cGN'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 9*Mg<P"  
 { eMMiSO!3  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 VQJ5$4a&  
  SaveBmp(); "%iR-s_>  
  return FALSE; Rn ^N+3o'M  
 } Mh B=+S[@  
 …… //其它处理及默认处理 t $ ~:C  
} ;."{0gq  
f2K3*}P  
$fpDABf  
  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。 '`VO@a  
;iI2K/ 3  
  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。 s5|)4Z ac  
8{^GC(W{]  
  二、编程步骤 L7'X7WYf&  
4 6JP1  
  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/.T  
dufHd  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; hzVr3;3Zn  
VTkT4C@I;Y  
  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; F>{uB!!L4  
>R!I  
  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+)hIK  
TgG)btQ  
  5、 添加代码,编译运行程序。 ^O9m11  
ep1Ajz.l  
三、程序代码 g(/O)G.  
)n61IqrW  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL c^UM(bW  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) fO|u(e  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ XSIO0ep  
#if _MSC_VER > 1000 Ppn ZlGQ6  
#pragma once Z?[J_[ZtR3  
#endif // _MSC_VER > 1000 Xst}tz62F  
#ifndef __AFXWIN_H__ 3]82gZG G  
#error include 'stdafx.h' before including this file for PCH ,=yIfbFQ  
#endif <1K: G/!  
#include "resource.h" // main symbols "[Lp-4A\  
class CHookApp : public CWinApp  C3Z(k}  
{ {-Oc8XI/  
 public: u"3cSuqy  
  CHookApp(); lw lW.C  
  // Overrides D#(Pg  
  // ClassWizard generated virtual function overrides }=R|iz*,!  
  //{{AFX_VIRTUAL(CHookApp) o{,(`o.1O  
 public: 438> )=  
  virtual BOOL InitInstance(); _e^V\O>  
  virtual int ExitInstance(); C'"6@-~  
  //}}AFX_VIRTUAL ;L{y3CWT  
  //{{AFX_MSG(CHookApp) $9b6,Y_-  
  // NOTE - the ClassWizard will add and remove member functions here. e q.aN3KB"  
  // DO NOT EDIT what you see in these blocks of generated code ! $ O>MV  
  //}}AFX_MSG k.hSN8  
  DECLARE_MESSAGE_MAP() 3Sb%]f5(  
}; r!=VV!XZ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); g9`ytWmM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gC:E38u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "A$Y)j<#G  
BOOL InitHotkey(); 7}?z=LHb3  
BOOL UnInit(); s7gf7 E#Y  
#endif 6H9]]Unju  
[IW7]Fv<F  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. dv>zK#!  
#include "stdafx.h" }6(:OB?  
#include "hook.h" 1&WFs6  
#include <windowsx.h> ;<Q_4 V  
#ifdef _DEBUG b?^<';,5  
#define new DEBUG_NEW "@Fxfd+Ot  
#undef THIS_FILE vdM\scO:  
static char THIS_FILE[] = __FILE__; uSbg*OA  
#endif }gt~{9?c  
#define MAX_KEY 100 |1x,_uyQ%  
#define CTRLBIT 0x04 @TT[H*,  
#define ALTBIT 0x02 jV8><5C  
#define SHIFTBIT 0x01 1 1'Tt!  
#pragma data_seg("shareddata") r#}%sof  
HHOOK hHook =NULL; O`| ri5d  
UINT nHookCount =0; !pXz-hxKT  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey r +fzmb  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3s Nq3I  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [\p0eUog/  
static int KeyCount =0; hWJc A.A  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift N:zSJW`1  
#pragma data_seg() 1 ErYob.p  
HINSTANCE hins; _E 8SX v  
void VerifyWindow(); h Nwb.[  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U3QnWPt}>  
//{{AFX_MSG_MAP(CHookApp) O*7~t17  
// NOTE - the ClassWizard will add and remove mapping macros here. @ vudeaup  
// DO NOT EDIT what you see in these blocks of generated code! [Hf FC3U  
//}}AFX_MSG_MAP YEj U3^@  
END_MESSAGE_MAP() LdL\B0^l  
mLqm83  
CHookApp::CHookApp()  O@$i  
{ h)8_sC  
 // TODO: add construction code here, .42OSV  
 // Place all significant initialization in InitInstance 4]R3*F  
}  glUP  
bvKi0-  
CHookApp theApp; YWdvL3Bgk,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _X/`4 G  
{ )$i3j 1[;  
 BOOL bProcessed=FALSE; D.} b<kDD  
 if(HC_ACTION==nCode) Ky|0IKE8Z  
 { |szfup~5es  
  if((lParam&0xc0000000)==0xc0000000){// Key up P&VI2k  
   switch(wParam) Y]Q*I\X  
   { )c/BD C7g  
    case VK_MENU: "/=x u|  
     MaskBits&=~ALTBIT; WBdb[N6\  
     break; VP&lWPA}\$  
    case VK_CONTROL: ShP V!$0  
     MaskBits&=~CTRLBIT; TjdYCk]'  
     break; fE iEy%o  
    case VK_SHIFT: 6P8X)3CE<T  
     MaskBits&=~SHIFTBIT; o\#e7Hqbh  
     break; 3{=4q  
    default: //judge the key and send message MJoC*8QxM  
     break; `pr,lL  
   } Z$@Nzza-  
   for(int index=0;index<MAX_KEY;index++){ I`l< }M  
    if(hCallWnd[index]==NULL) hGLBFe#3  
     continue; .#}R$}e+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )1ciO+_  
    { 7y&`H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %,BJkNV  
     bProcessed=TRUE; xOH@V4z:  
    } ^EZoP:x(oE  
   } e$Ej7_.#;  
  } W:G*t4i  
  else if((lParam&0xc000ffff)==1){ //Key down R<U <Y'Y  
   switch(wParam) -q27N^A0  
   { X-)6.[9f  
    case VK_MENU: +$C5V,H ~  
     MaskBits|=ALTBIT; &M0v/!%L  
     break; ]MyWB<9M  
    case VK_CONTROL: [o6d]i!  
     MaskBits|=CTRLBIT; BN0))p  
     break; |{(ynZ]R  
    case VK_SHIFT: z\, w$Ef+  
     MaskBits|=SHIFTBIT; (J;<&v}Gad  
     break; FrS>.!OFn  
    default: //judge the key and send message S_zE+f+ 2  
     break; v?rN;KY#pK  
   } OB:G5B`  
   for(int index=0;index<MAX_KEY;index++) 0FBifK  
   { "A7tb39*  
    if(hCallWnd[index]==NULL) A'T! og|5  
     continue; hO8B]4=&*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) a,.9eHf  
    { ESAh(A)8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); xfilxd  
     bProcessed=TRUE; \BA_PyS?W+  
    } 1x]G/I*  
   } { .AFg/Z  
  } ygHNAQG~  
  if(!bProcessed){ &f$jpIyVX  
   for(int index=0;index<MAX_KEY;index++){ \W4SZR%u  
    if(hCallWnd[index]==NULL) OWU]gh@r  
     continue; }0 Z3Lrv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ;XjKWM;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TSeAC[%pL  
   } 3't?%$'5  
  } wp$=lU{B  
 } G7u85cie  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); pLRHwL.  
} TA*49Qp  
q?wB h^  
BOOL InitHotkey() ^(%>U!<<%,  
{ .[7m4iJf  
 if(hHook!=NULL){ Kgcg:r:  
  nHookCount++; -7CkOZT  
  return TRUE; n']@Spm  
 } ,+XQ!y%  
 else vjWS35i  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 1'h?qv^(  
  if(hHook!=NULL) `eA0Z:`g!  
   nHookCount++; X@B+{IFC  
  return (hHook!=NULL); &}WSfZ0{  
} gxF3gM  
BOOL UnInit() vg<_U&N=-r  
{ qzq>C"z\Y$  
 if(nHookCount>1){  u >x2  
  nHookCount--; >%{h_5  
  return TRUE; 3.soCyxmc  
 } ,ua]h8  
 BOOL unhooked = UnhookWindowsHookEx(hHook); :t(}h!7  
 if(unhooked==TRUE){ C)`/Q(^  
  nHookCount=0; rz4S"4  
  hHook=NULL; NWFZ:h@v  
 } I3A](`  
 return unhooked; '8Yx  
} fV3J:^)F  
r3|vu"Uei  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) r]TeR$NJ  
{ C0e< _6p=  
 BOOL bAdded=FALSE; &#~yci2{  
 for(int index=0;index<MAX_KEY;index++){ cOIshT1  
  if(hCallWnd[index]==0){ { aU~[5L3(  
   hCallWnd[index]=hWnd; FG?B:Zl%T  
   HotKey[index]=cKey; U]_1yX  
   HotKeyMask[index]=cMask; *0Fn C2W1  
   bAdded=TRUE; v6]lH9c{,  
   KeyCount++; V /|@   
   break; gZ 9<H q  
  } CpA=DnZ  
 } ~s+\Y/@A  
 return bAdded; ).LJY<A  
} #;+GNF}0mG  
Bdf3@sbM]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NVP~`sxiZ  
{ 07n=H~yU  
 BOOL bRemoved=FALSE; |= ~9y"F  
 for(int index=0;index<MAX_KEY;index++){ 5'@}8W3b  
  if(hCallWnd[index]==hWnd){ yVSJn>l!  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W;2y.2*  
    hCallWnd[index]=NULL; (ue;O~  
    HotKey[index]=0; (xMAo;s_  
    HotKeyMask[index]=0; 'Kl} y,  
    bRemoved=TRUE; o d!TwGX  
    KeyCount--; RE*;nSVFt  
    break; K@+&5\y]  
   } (Ys 0|I3  
  } ^,,|ED\M{m  
 } &6h,'U  
 return bRemoved; }6`#u :OZ  
} y/E%W/3  
q^EG'\<^  
void VerifyWindow() ~u.CY  
{ RxcX\:  
 for(int i=0;i<MAX_KEY;i++){ s(-$|f+s  
  if(hCallWnd!=NULL){ x-cg df  
   if(!IsWindow(hCallWnd)){ -K PbA`j+  
    hCallWnd=NULL; TEv3;Z*N  
    HotKey=0; lRn>/7sg$  
    HotKeyMask=0; b16\2%Ea1  
    KeyCount--; ~r+;i,,X  
   } kz]qk15w  
  } %-> X$,Q :  
 } A=>%KQc?  
} dQTJC %]O  
H&l/o  
BOOL CHookApp::InitInstance() S9-FKjU  
{ .- uH ax0  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~ #Vrf0w/  
 hins=AfxGetInstanceHandle(); ;=aj)lemCr  
 InitHotkey(); _A1r6  
 return CWinApp::InitInstance(); 1#6c sZW5  
} :D;BA  
eWE7>kwh  
int CHookApp::ExitInstance() 624l5}@:  
{ ELPzqBI  
 VerifyWindow(); 5!-'~W  
 UnInit(); :(E.sT "R  
 return CWinApp::ExitInstance(); '8PZmS8X9  
} "cj6i{x,~w  
Dy mf  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file \\xoOA.  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) V& _  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lh{U@,/  
#if _MSC_VER > 1000 PS**d$ S  
#pragma once [<rV "g  
#endif // _MSC_VER > 1000 CN+[|Mz*p  
"K;f[&xO,o  
class CCaptureDlg : public CDialog |L,_QXA2  
{ Onz@A"  
 // Construction 67?O}~jbG  
 public: \$$DM"+:;H  
  BOOL bTray; ) 7w%\i{M  
  BOOL bRegistered; !o1+#DL)MU  
  BOOL RegisterHotkey(); rUmaKh?v|X  
  UCHAR cKey; !E#FzY!}Pl  
  UCHAR cMask; imC>T!-7  
  void DeleteIcon(); I82GZL  
  void AddIcon(); dv1Y2[  
  UINT nCount; M8(N9)N  
  void SaveBmp(); [`2V!rU  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor hR(\%p  
  // Dialog Data =*>ri  
  //{{AFX_DATA(CCaptureDlg) ) G a5c  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5bBY[qp  
  CComboBox m_Key; epXvk &  
  BOOL m_bControl; 5L!EqB>m;  
  BOOL m_bAlt; %=e^MN1  
  BOOL m_bShift; O4t0 VL$  
  CString m_Path; 7wKT:~~oS3  
  CString m_Number; VN]70LFz*i  
  //}}AFX_DATA > &tmdE  
  // ClassWizard generated virtual function overrides (.^KuXd  
  //{{AFX_VIRTUAL(CCaptureDlg) SI\ O>a 9{  
 public: <5BNcl\ZL  
  virtual BOOL PreTranslateMessage(MSG* pMsg); > >%m,F[  
 protected: 'A2^K5`3  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support m?GBvL$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); NpI "XQ  
  //}}AFX_VIRTUAL !-B$WAV  
  // Implementation B:oE&Ahh{  
 protected: r^zra|]  
  HICON m_hIcon; %1h%#/#[  
  // Generated message map functions `8M{13fv  
  //{{AFX_MSG(CCaptureDlg) \3q Z0  
  virtual BOOL OnInitDialog(); a!guZUg6  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); jJbS{1z  
  afx_msg void OnPaint(); D6N 32q@  
  afx_msg HCURSOR OnQueryDragIcon(); rJtpTV@.  
  virtual void OnCancel(); s`#g<_{X  
  afx_msg void OnAbout(); jEu-CU#:  
  afx_msg void OnBrowse(); o&-D[|E|  
  afx_msg void OnChange(); <!;NJLe`  
 //}}AFX_MSG oDW)2*8yF  
 DECLARE_MESSAGE_MAP() SJ*qgI?}T  
}; \l-JU  
#endif `?=Y^+*!-  
B5v5D[ o5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @5}(Y( @  
#include "stdafx.h" rUn1*KWbE  
#include "Capture.h" $-AG $1  
#include "CaptureDlg.h" ^J~5k,7jX  
#include <windowsx.h> L+ K,Y:D!W  
#pragma comment(lib,"hook.lib") Tji*\<?  
#ifdef _DEBUG ,B2p\  
#define new DEBUG_NEW L5DeLF+  
#undef THIS_FILE >v#6SDg  
static char THIS_FILE[] = __FILE__; _D"V^4^yqu  
#endif  hik.c3  
#define IDM_SHELL WM_USER+1 2,'~'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); W>y >  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Bi-x gq'z  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; .VXadgM  
class CAboutDlg : public CDialog pd dumbp  
{ b]5/IT)@O  
 public: mlLx!5h=  
  CAboutDlg(); R+r;V]-/  
  // Dialog Data <H,E1kGw9  
  //{{AFX_DATA(CAboutDlg) bUU\bc  
  enum { IDD = IDD_ABOUTBOX }; br;~}GR_h  
  //}}AFX_DATA .C|dGE?,  
  // ClassWizard generated virtual function overrides __%){j6  
  //{{AFX_VIRTUAL(CAboutDlg) 3;?DKRIcX  
 protected: Q3<ctd\]Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support l3N '@GO  
  //}}AFX_VIRTUAL 'r'+$D7  
  // Implementation Rt.2]eZEJ  
 protected:  |\FJ  
  //{{AFX_MSG(CAboutDlg) \)M EM=U  
  //}}AFX_MSG 6DVHJ+WTV  
  DECLARE_MESSAGE_MAP() \ lW*.<  
}; :d1Kq _\K  
lk4U/:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^]k=*>{ R  
{ VXPs YR&  
 //{{AFX_DATA_INIT(CAboutDlg) P" aw--f(  
 //}}AFX_DATA_INIT D4jZh+_|S  
} lw`$(,  
m^$KDrkD  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) K |^OnM  
{ p'4ZcCW?f  
 CDialog::DoDataExchange(pDX); |-9##0H  
 //{{AFX_DATA_MAP(CAboutDlg) 9}T(m(WQVu  
 //}}AFX_DATA_MAP }xJ!0<Bs  
} @{@DGc  
6 m%/3>q  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) *#.Ku(C+  
 //{{AFX_MSG_MAP(CAboutDlg) \2Yo*jE}  
 // No message handlers a|-B#S  
 //}}AFX_MSG_MAP m$`4.>J  
END_MESSAGE_MAP() ffy,ds_7  
g?rK&UTU  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ri/D>[  
: CDialog(CCaptureDlg::IDD, pParent) ,l#f6H7p  
{ 9Xe|*bT  
 //{{AFX_DATA_INIT(CCaptureDlg) af_b G;  
  m_bControl = FALSE; QfV:&b`  
  m_bAlt = FALSE; %Vb~}sT:  
  m_bShift = FALSE; zP>=K  
  m_Path = _T("c:\\"); R[W'LRh~:1  
  m_Number = _T("0 picture captured."); DD'RSV5]  
  nCount=0; G&q@B`I  
  bRegistered=FALSE; :gM_v?sy  
  bTray=FALSE; .Fx-$Yqy  
 //}}AFX_DATA_INIT ~.E r  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \iH\N/  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^Sc48iDc  
} OzV|z/R2'  
]Wn=Oc{F  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2,rjy|R`  
{ xJ^pqb  
 CDialog::DoDataExchange(pDX); %'MR;hQsd8  
 //{{AFX_DATA_MAP(CCaptureDlg) b\vL^\bX8  
  DDX_Control(pDX, IDC_KEY, m_Key); mW)C=X%  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |!cM_&  
  DDX_Check(pDX, IDC_ALT, m_bAlt); eC='[W<a.  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $-uMWJ)l  
  DDX_Text(pDX, IDC_PATH, m_Path); &4m;9<8\  
  DDX_Text(pDX, IDC_NUMBER, m_Number); MtG~ O;?8  
 //}}AFX_DATA_MAP rT'<6]`  
} Ubv_ a  
\|7Y"WEQ  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 3uuB/8  
//{{AFX_MSG_MAP(CCaptureDlg) 6'|NALW  
 ON_WM_SYSCOMMAND() K7},X01^  
 ON_WM_PAINT() ub-vtRpm  
 ON_WM_QUERYDRAGICON() *#Iqz9X.Y3  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ug?#Oa  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ^,#MfF6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "|GX%> /  
//}}AFX_MSG_MAP m88[(l  
END_MESSAGE_MAP() pAH 9  
S~ZRqL7Z O  
BOOL CCaptureDlg::OnInitDialog() w1)SuMFK_  
{ i%otvDn1  
 CDialog::OnInitDialog(); J%P{/nR  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); X?S LYm@v  
 ASSERT(IDM_ABOUTBOX < 0xF000); J5zu}U?  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -v~XS-F  
 if (pSysMenu != NULL) O7xBMqMf  
 { xL|4'8  
  CString strAboutMenu; "uU[I,h  
  strAboutMenu.LoadString(IDS_ABOUTBOX); q;<Q-jr&O  
  if (!strAboutMenu.IsEmpty()) ~2}^ -,  
  { (*G'~gSX  
   pSysMenu->AppendMenu(MF_SEPARATOR); ++CL0S$e  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8]&lUMaqVZ  
  } 98!H$6k  
 } 1-}$sO c  
 SetIcon(m_hIcon, TRUE); // Set big icon r'J3\7N!u  
 SetIcon(m_hIcon, FALSE); // Set small icon +\66; 7]s  
 m_Key.SetCurSel(0); An=Q`Uxt/  
 RegisterHotkey(); ZIJTGa}B q  
 CMenu* pMenu=GetSystemMenu(FALSE); @,SN8K0T  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fj[tm  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); }J] P`v  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); XaYgl&x'!x  
 return TRUE; // return TRUE unless you set the focus to a control i; 3qMBVY~  
} fVxRK\a\\  
qD> D  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 6'JP%~QlS  
{ C<hb{$@  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 0zqTX< A  
 { Cz#3W8jV  
  CAboutDlg dlgAbout; M5l*D'GE]  
  dlgAbout.DoModal(); &;@U54,wV  
 } \\,z[C  
 else n4G53+y'  
 { jIL$hqo  
  CDialog::OnSysCommand(nID, lParam); LJBDB6  
 } q^+Z>   
} @-BgPDi.Z  
f2FGod<CzN  
void CCaptureDlg::OnPaint() ,E8~^\HV  
{ BXX1G  
 if (IsIconic()) Wg5i#6y8w  
 { o/p'eY:)  
  CPaintDC dc(this); // device context for painting Lz;E/a}s  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); g<PdiVp+  
  // Center icon in client rectangle Z.mnD+{  
  int cxIcon = GetSystemMetrics(SM_CXICON); *,oZ]!   
  int cyIcon = GetSystemMetrics(SM_CYICON); ;@I}eZ,f$  
  CRect rect; AV?<D.<  
  GetClientRect(&rect); }S>:!9f  
  int x = (rect.Width() - cxIcon + 1) / 2; z,/y2H2  
  int y = (rect.Height() - cyIcon + 1) / 2; M ^~  
  // Draw the icon l%9nA.M'  
  dc.DrawIcon(x, y, m_hIcon); b}jLI_R{  
 } U-GV^j  
 else ^1NtvQe@Y\  
 { |cq%eN  
  CDialog::OnPaint(); 0Z>oiBr4  
 } (r )fx  
} d^jIsE`  
cRC)99HP  
HCURSOR CCaptureDlg::OnQueryDragIcon() N>_d {=P  
{ U-3uT&m*9.  
 return (HCURSOR) m_hIcon; Is !DiB  
} "ktC1y1  
b{Kw.?85  
void CCaptureDlg::OnCancel() [EV}P&U  
{ N0G-/  
 if(bTray) z/t:gc.  
  DeleteIcon(); /WI HG0D  
  CDialog::OnCancel(); 7<%Rx19L*  
}  LYX\#  
5s2334G  
void CCaptureDlg::OnAbout() \|9KOulr  
{ wq"AWyu  
 CAboutDlg dlg; yy-\$<j  
 dlg.DoModal(); +qEvz<kch  
} #] 5|Qhrr+  
WS)u{ or  
void CCaptureDlg::OnBrowse() O@bDMg  
{ yD!V;?EnK  
 CString str; u3H2\<  
 BROWSEINFO bi; t#h<'?\E  
 char name[MAX_PATH]; $MG. I[h  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); `;R|SyrX  
 bi.hwndOwner=GetSafeHwnd(); -/ #tQ~{gs  
 bi.pszDisplayName=name; <ArP_! `3  
 bi.lpszTitle="Select folder"; kVZ5>D$  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ywV8s|o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); c/57_fOK  
 if(idl==NULL) 20f):A6  
  return; R4|<Vp<U2  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); l7r!fAV-f  
 str.ReleaseBuffer(); IK-E{,iKc  
 m_Path=str; (N\Zz*PLz  
 if(str.GetAt(str.GetLength()-1)!='\\') `'`T'+0  
  m_Path+="\\"; WwDxZ>9jw  
 UpdateData(FALSE); S Yvifgp  
} V F'! OPN  
hOx">yki  
void CCaptureDlg::SaveBmp() Lay+)S.ta[  
{ B1A5b=6G<  
 CDC dc; 2JYt.HN  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); YA>du=6y\  
 CBitmap bm; `$\Y,9E}x  
 int Width=GetSystemMetrics(SM_CXSCREEN); ;pNHT*>u,  
 int Height=GetSystemMetrics(SM_CYSCREEN); $|YIr7?R  
 bm.CreateCompatibleBitmap(&dc,Width,Height); c#e_Fs  
 CDC tdc; 8EPV\M1%  
 tdc.CreateCompatibleDC(&dc); ft[g1  
 CBitmap*pOld=tdc.SelectObject(&bm); ^eEj 5Rh  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *<!W k\  
 tdc.SelectObject(pOld); =`X@+~%-  
 BITMAP btm; G K @]61b  
 bm.GetBitmap(&btm); f.=4p^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; pstQithS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); SJ-g2aAT  
 BITMAPINFOHEADER bih; RfwTqw4@  
 bih.biBitCount=btm.bmBitsPixel; sy` : wp  
 bih.biClrImportant=0; #7U,kTj9  
 bih.biClrUsed=0; (K+TqJw  
 bih.biCompression=0; MNiu5-g5  
 bih.biHeight=btm.bmHeight; p\8cl/~  
 bih.biPlanes=1; \6Ze H  
 bih.biSize=sizeof(BITMAPINFOHEADER); O.E   
 bih.biSizeImage=size; 1h+!<c q  
 bih.biWidth=btm.bmWidth; GfU+'k;9  
 bih.biXPelsPerMeter=0; G1~|$X@@  
 bih.biYPelsPerMeter=0; k[ Iwxl;/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8Db~OYVJG  
 static int filecount=0; bhSpSul  
 CString name; z[S,hD\w  
 name.Format("pict%04d.bmp",filecount++); \wNn c"  
 name=m_Path+name; Co19^g*  
 BITMAPFILEHEADER bfh; iEki<e/  
 bfh.bfReserved1=bfh.bfReserved2=0; 7`tnoTUv  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _A)<"z0E  
 bfh.bfSize=54+size; XI\aZ\v  
 bfh.bfOffBits=54; Rhx7eU#&  
 CFile bf; BQB O]<99  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ h ;5 -X7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +c\s%Gzrh  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); vd /_`l.D  
  bf.WriteHuge(lpData,size); KW&&AuPb}  
  bf.Close(); r[Q$w>  
  nCount++; 3_T'TzQ u  
 } RQU5T 2,  
 GlobalFreePtr(lpData); Z=!*7@QY  
 if(nCount==1) !r.}y|t?;  
  m_Number.Format("%d picture captured.",nCount); @WEem(@  
 else B:z-?u#B  
  m_Number.Format("%d pictures captured.",nCount); =,[46 ;q  
  UpdateData(FALSE); 4 _N)1u !  
} ja7Z v[  
%TG$5' )0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 0 \LkJ*i  
{ =pcj{B{qa  
 if(pMsg -> message == WM_KEYDOWN) >Fld7;L?<  
 { Mn~A;=%qF  
  if(pMsg -> wParam == VK_ESCAPE) !nj%n  
   return TRUE; \MtiLaI"  
  if(pMsg -> wParam == VK_RETURN) vEzzdDwi6  
   return TRUE; jD^L<  
 } 9v cUo?/  
 return CDialog::PreTranslateMessage(pMsg); |k/;.  
} ]QT0sGl  
Ip4NkUI3T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sp**Sg)  
{ g@Ni!U"_c  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ITc/aX  
  SaveBmp(); aG}9Z8D  
  return FALSE; Pz|qy,  
} }h_Op7.5D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ @?B=8VHR  
 CMenu pop; R|+R4'  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); &ApJ'uC  
 CMenu*pMenu=pop.GetSubMenu(0); #]eXI $HP  
 pMenu->SetDefaultItem(ID_EXITICON); EJWMr`zdn  
 CPoint pt; }7=a,1T  
 GetCursorPos(&pt); DhZtiqL#_  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); j|`{ 1`'  
 if(id==ID_EXITICON) 4nl>&AV  
  DeleteIcon(); N^ D/}n  
 else if(id==ID_EXIT) Xb^\{s?b  
  OnCancel(); _f3A6ER`  
 return FALSE; M2@q{RiS  
} b=|&0B$E  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8nnkv,wa  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Y6L+3*Qt  
 AddIcon(); WQ5sC[&   
 return res; ^ Nsl5  
} @5?T]V g  
Q5,@ P?  
void CCaptureDlg::AddIcon() )E7A,ZW,  
{ uCu,'F,6Y  
 NOTIFYICONDATA data; 3(5RUI-  
 data.cbSize=sizeof(NOTIFYICONDATA); zt,-O7I'1  
 CString tip; n~&R_"mv(  
 tip.LoadString(IDS_ICONTIP); k9Sqp :l,  
 data.hIcon=GetIcon(0); q6Q=Zo@  
 data.hWnd=GetSafeHwnd(); |Lhz^5/  
 strcpy(data.szTip,tip); oyr2lfz*  
 data.uCallbackMessage=IDM_SHELL; |~HlNUPR  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; z}Z`kq+C  
 data.uID=98; 5R=lTx/Hj  
 Shell_NotifyIcon(NIM_ADD,&data); hx^a&"  
 ShowWindow(SW_HIDE); `90v~O F  
 bTray=TRUE; Xl/G|jB9  
} /hX"O ?^  
$k`8Zx w  
void CCaptureDlg::DeleteIcon() @^` <iTK&p  
{ 7@lXN8_f  
 NOTIFYICONDATA data; j&Hn`G  
 data.cbSize=sizeof(NOTIFYICONDATA); *(vq-IE\$  
 data.hWnd=GetSafeHwnd(); p_z"Uwp  
 data.uID=98; sRZ:9de+  
 Shell_NotifyIcon(NIM_DELETE,&data); zDl, bLiJ  
 ShowWindow(SW_SHOW); O h" ^  
 SetForegroundWindow(); i9xv`Ev=R  
 ShowWindow(SW_SHOWNORMAL); W1@;94Sb~  
 bTray=FALSE; X#3<hN*v  
} `U g.c  
6#KI? 6  
void CCaptureDlg::OnChange() Dz50,*}J  
{ *cf"l  
 RegisterHotkey(); 8zc!g|5"  
} + kF[Oh#  
P+b^;+\1s  
BOOL CCaptureDlg::RegisterHotkey() Oq2H>eW`f  
{ Iv<9} )2K  
 UpdateData(); z;/'OJ[.  
 UCHAR mask=0; *SY4lqN  
 UCHAR key=0; 'QS"4EvdD  
 if(m_bControl) ltrSTH,kL  
  mask|=4; x>J3tp$2  
 if(m_bAlt) W vJ?e  
  mask|=2; Pu^~]^W)  
 if(m_bShift) 5i^vN"J  
  mask|=1; tbPPI)lu  
  key=Key_Table[m_Key.GetCurSel()]; (Z$6J Nkz  
 if(bRegistered){ >o} ati  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); s =5H.q%PV  
  bRegistered=FALSE; yhdG 93  
 } bvgD;:Aj  
 cMask=mask; 2Y4&Sba^Y  
 cKey=key; W<LaR,7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >ek%P;2w>  
 return bRegistered; od}x7RI%m  
} 'YR5i^:t  
Dy@ \!F  
  四、小结 9(l'xuX  
=_dd4`G&<  
  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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