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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: ]v_xEH}T  
  iXl1S[.l  
  一、实现方法 t 1C{  
1b|<   
  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: iT^lk'?{O  
P#ru-0DD  
#pragma data_seg("shareddata") -m'a%aog  
HHOOK hHook =NULL; //钩子句柄 ?U-p jjM  
UINT nHookCount =0; //挂接的程序数目 '[-H].-!   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 #i2q}/w5`C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 :L`z~/6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 2~J|x+  
static int KeyCount =0; :+Dn]:\  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 KAsS= `  
#pragma data_seg() KMbBow3o*~  
GUN<ZOYb=  
  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。 *"zE,Bp"  
 iI ^{OD  
  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: (/*-M]>  
_4E+7+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR t&r?O dc&m  
cKey,UCHAR cMask) |um)vlN;9  
{ vN4X%^:(  
 BOOL bAdded=FALSE; fs)O7x-B(  
 for(int index=0;index<MAX_KEY;index++){ 9(X *[X#  
  if(hCallWnd[index]==0){  %;W8;  
   hCallWnd[index]=hWnd; m9e$ZZG$  
   HotKey[index]=cKey; ! h4So4p  
   HotKeyMask[index]=cMask; ^Ws~h\{%  
   bAdded=TRUE; um8ZhXq  
   KeyCount++; J7cqnj  
   break; D3^v[>E2  
  } T >-F~?7Sv  
 } ` jUn  
 return bAdded; >LLzG  
} Q  o=  
//删除热键 7L<oWAq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) @~N#)L^  
{ "t\9@nzdX  
 BOOL bRemoved=FALSE; IS=)J( 0  
 for(int index=0;index<MAX_KEY;index++){ QM_~w \  
  if(hCallWnd[index]==hWnd){ H+ M ~|Ju7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ppp&3h[dW)  
    hCallWnd[index]=NULL; &Y#9~$V=  
    HotKey[index]=0; HE,wEKp  
    HotKeyMask[index]=0; 6)bfd^JYn  
    bRemoved=TRUE; s[s^z<4G  
    KeyCount--; 9n%W-R.  
    break; ljf9L:L  
   } ]g)%yuox9F  
  } ovfw_  
 } \@F{Q-  
 return bRemoved; X|q0m3jt  
} zYs? w=  
(f.A5~e  
4%6Q+LS']Q  
  DLL中的钩子函数如下: 1b D c ct  
]D]K_`!K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eb8_guZ  
{ Q@j:b]Y9  
 BOOL bProcessed=FALSE; q{5Vq_s\  
 if(HC_ACTION==nCode)  OB^  
 { &a(w0<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 x p$0J<2  
   switch(wParam) ^IId =V=2  
   {  3&*%>)  
    case VK_MENU: D0]9 -h  
     MaskBits&=~ALTBIT; E nUo B<  
     break; p_nrua?  
    case VK_CONTROL: #]'V#[;~  
     MaskBits&=~CTRLBIT; [a Z)*L ;  
     break; M1>a,va8Zq  
    case VK_SHIFT: "bO]  
     MaskBits&=~SHIFTBIT; @6tx5D?  
     break; JH5])i0  
    default: //judge the key and send message 6x7=0}'  
     break; u}h'v&"e,  
   } x-QP+M`Pu  
   for(int index=0;index<MAX_KEY;index++){ >L(F{c:  
    if(hCallWnd[index]==NULL) VuR BJ2D  
     continue; )- \w  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YS~x-5OE\  
    { PDsLJ|:yL  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Af%?WZlOq  
     bProcessed=TRUE; -Tt}M#W   
    } ditzl(L   
   } M]{!Nx  
  } INT2i8oU  
  else if((lParam&0xc000ffff)==1){ //有键按下 YsDl2P  
   switch(wParam) *~"`&rM(  
   { G@'0vYb#  
    case VK_MENU: -,tYfQ;:  
     MaskBits|=ALTBIT; Qi}LV"&L  
     break; e{O5y8,  
    case VK_CONTROL: f:SF&t*  
     MaskBits|=CTRLBIT; =V , _  
     break; Rju8%FRO  
    case VK_SHIFT:  %!S  
     MaskBits|=SHIFTBIT; ig,|3(  
     break; -a[{cu{  
    default: //judge the key and send message oGqv,[$qN  
     break; 4tU~ ^z  
   } Y[DKj!v  
   for(int index=0;index<MAX_KEY;index++){ ,+RO 5n  
    if(hCallWnd[index]==NULL) 1L|(:m+  
     continue; ? `KOW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w;(gi  
    { S#9SAX [  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); [:'n+D=T3M  
     bProcessed=TRUE; C"{on%  
    } (D{}1sZBQ  
   } #.)>geLC>9  
  } l.juys8s  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 85 hYYB0v  
   for(int index=0;index<MAX_KEY;index++){ jJvNN -^  
    if(hCallWnd[index]==NULL) Y P c<  
     continue; <7^~r(DP  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Zy%Z]dF  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); E0Djo'64  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 $yAfs3/%)s  
   } QFPx4F7(e  
  } 8hfh,v5(  
 } !;gke,fB  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |DD?3#G01  
} >C[1@-]G%7  
gT OMD  
  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: lo:~~l  
c5R{Sl  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); yh:,[<q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); cZ>W8{G  
L'Zud,JKg  
  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: bEKLameKv  
^j %UZ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nS4S[|w"  
{ 81cmG `G7  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) q1Sm#_7  
 { }D+8K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 zf~zYZSr  
  SaveBmp(); t] wM_]+  
  return FALSE; m-RY{DO+  
 } Ji[g@#  
 …… //其它处理及默认处理 g-FZel   
} Ak Tw?v'  
H\mVK!](D  
%#9~V  
  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。 Yk Pt*?,P/  
dO,05?q|  
  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。 63S1ed [  
hH}/v0_jb  
  二、编程步骤 %Be[DLtE"  
SWb5K0YRn  
  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"; >EtP^Lu~f_  
HW72 6K*  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; dA/o4co  
|vz;bJG  
  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; zDyeAxh4  
xUi!|c  
  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; QJWES%m`  
9Oyi:2A  
  5、 添加代码,编译运行程序。 sVd_O[  
z|*6fFE   
三、程序代码 L0b] ^_ tI  
}27Vh0v  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Vor9 ?F&w  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 7RE6y(V1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ xm5FQ) T  
#if _MSC_VER > 1000 j#P4Le[t  
#pragma once tcEf ~|3  
#endif // _MSC_VER > 1000 i%PHYSJ.  
#ifndef __AFXWIN_H__ T zYgH  
#error include 'stdafx.h' before including this file for PCH T1HiHvJ  
#endif Xl6ZV,1=n7  
#include "resource.h" // main symbols 0DIM]PS  
class CHookApp : public CWinApp kZ-~ ;fBe  
{ ws>Iyw.u  
 public: }#>d2 =T$  
  CHookApp(); n "KJB  
  // Overrides  _np>({  
  // ClassWizard generated virtual function overrides Uv`v|S:+2  
  //{{AFX_VIRTUAL(CHookApp) j jT 2k  
 public: MZW Y  
  virtual BOOL InitInstance(); 0C+y q'D~[  
  virtual int ExitInstance(); 3dDQz#  
  //}}AFX_VIRTUAL [e@OHQM  
  //{{AFX_MSG(CHookApp) P8,jA<W  
  // NOTE - the ClassWizard will add and remove member functions here. , )pt_"-XA  
  // DO NOT EDIT what you see in these blocks of generated code ! H0 n@kKr  
  //}}AFX_MSG W?J*9XQ`  
  DECLARE_MESSAGE_MAP() ioa_AG6B  
}; <VR&= YJ  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); G!LNP&~  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); j_uY8c>3\q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *2 $m>N  
BOOL InitHotkey(); #'Y6UGJ\n  
BOOL UnInit(); LY!3u0PnlT  
#endif ; 9&.QR(  
T.P Z}4  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |ezO@  
#include "stdafx.h" mRnzP[7-\)  
#include "hook.h" ae#HA[\0G  
#include <windowsx.h> Qn)[1v  
#ifdef _DEBUG 1fhK{9#  
#define new DEBUG_NEW \BcJDdL  
#undef THIS_FILE ]AA*f_!  
static char THIS_FILE[] = __FILE__; r]EZ)qp^@  
#endif X:-bAu}D  
#define MAX_KEY 100 Xa%&.&V  
#define CTRLBIT 0x04 $_7d! S"  
#define ALTBIT 0x02 VfC[U)w*vm  
#define SHIFTBIT 0x01 .y_bV=  
#pragma data_seg("shareddata") $CwTNm?  
HHOOK hHook =NULL; d>b,aj(  
UINT nHookCount =0; NT9- j#V  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey !na0Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT hOLy*%  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey >`?+FDOJ,  
static int KeyCount =0; VmH_0IM^6  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift V<NsmC=g  
#pragma data_seg() b:5%}  
HINSTANCE hins; [xs)u3b  
void VerifyWindow(); QRZTT qG  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9Glfi@.  
//{{AFX_MSG_MAP(CHookApp) Ysc|kxLb  
// NOTE - the ClassWizard will add and remove mapping macros here. VDu .L8  
// DO NOT EDIT what you see in these blocks of generated code! aU]O$Pg{  
//}}AFX_MSG_MAP p9 ,\{Is  
END_MESSAGE_MAP() bb0McEQy  
A"<)(M+kG  
CHookApp::CHookApp() Iam-'S5  
{ ny_ kr`$42  
 // TODO: add construction code here, {p*hNi)0  
 // Place all significant initialization in InitInstance nK%/tdq  
} n.Eoi4jV'  
vb.Y8[  
CHookApp theApp; CbH T #  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) $h]Y<&('G  
{ uZ`d&CEh  
 BOOL bProcessed=FALSE; xBE RCO^  
 if(HC_ACTION==nCode) UFIAgNKl  
 { D7_Hu'y<o  
  if((lParam&0xc0000000)==0xc0000000){// Key up Jn@Mbl  
   switch(wParam) cM<hG:4%wX  
   { 0@e}hv;  
    case VK_MENU: {Fp`l\,  
     MaskBits&=~ALTBIT; s8yTK2v2\  
     break; PxVI {:Uz  
    case VK_CONTROL: 6v2RS  
     MaskBits&=~CTRLBIT; #9hXZr/8  
     break; 7k#${,k  
    case VK_SHIFT: Dss/>! mN  
     MaskBits&=~SHIFTBIT; zEPx  
     break; z1SMQLk  
    default: //judge the key and send message oB{}-[G  
     break; 23\j1?  
   } 77&^$JpM  
   for(int index=0;index<MAX_KEY;index++){ 400Tw`AiJ  
    if(hCallWnd[index]==NULL) G0; EbJ/&  
     continue; WP@JrnxO\`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) < ;,S"e  
    { Th;gps%b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z/6'kE{l  
     bProcessed=TRUE; K'{W9~9Lq  
    } LnI{S{]wDh  
   } ~q]|pD"\K|  
  } :a f;yu  
  else if((lParam&0xc000ffff)==1){ //Key down "U5Ln2X{J  
   switch(wParam) hNq8 uyKx  
   { 5Ckk5b  
    case VK_MENU: C>`.J_N  
     MaskBits|=ALTBIT; 9*TS90>a  
     break; ox\B3U%`p}  
    case VK_CONTROL: &W)+8N,L  
     MaskBits|=CTRLBIT; [;IDTo!<>  
     break; hDD~,/yVxs  
    case VK_SHIFT: y5AXL5  
     MaskBits|=SHIFTBIT; +%le/Pg@  
     break; X~)V)'R  
    default: //judge the key and send message \A3>c|  
     break; x(3 I?#kE  
   } x,w`OMQ}c  
   for(int index=0;index<MAX_KEY;index++) =FD`A#\C~  
   { ReB(T7Vk=  
    if(hCallWnd[index]==NULL) 4Fr7jD,#k  
     continue;  $`XN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FG;<`4mY  
    { B=Zukg1G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); hV>4D&<  
     bProcessed=TRUE; @cS1w'=  
    } sx-Hw4.a"  
   } I"F .%re  
  } ><#2O  
  if(!bProcessed){ mS)|6=Y  
   for(int index=0;index<MAX_KEY;index++){ J^g,jBk  
    if(hCallWnd[index]==NULL) 0,~6TV<K  
     continue; GOZQ5m -  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) q(jkit~`A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]4 K1%ZV  
   } .n)!ZN  
  } az \<sWb#  
 } S-M)MCL  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !}L~@[v,uL  
} i>]<*w  
Av;q:x?  
BOOL InitHotkey() 94p:|5@  
{ /mMAwx  
 if(hHook!=NULL){ F; MF:;mM  
  nHookCount++; M8#*zCp{5  
  return TRUE; !HdvCYB>  
 } j2 o1"  
 else !0!U01SWa  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); /.| A  
  if(hHook!=NULL) [yYH>~SuwZ  
   nHookCount++; :Er^"9'A2  
  return (hHook!=NULL); :!+}XT7)/  
} u^aFj%}]L  
BOOL UnInit() n ,&/D  
{ {XDY:`vZ}  
 if(nHookCount>1){ Uxk[O  
  nHookCount--; ]M+VSU  
  return TRUE; Z92iil;t  
 } ~|r'2V*  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  O ':0V  
 if(unhooked==TRUE){ $TD~k;   
  nHookCount=0; ~$&:NB1~q  
  hHook=NULL; $KwI}>E4  
 } 7g A08M[O  
 return unhooked; I9[1U   
} ?u_gXz;A  
#K :-Bys5v  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $S6HZG:N  
{ }XGMa?WR  
 BOOL bAdded=FALSE; BrlzN='j}  
 for(int index=0;index<MAX_KEY;index++){ 3wN?|N  
  if(hCallWnd[index]==0){ +{")E)  
   hCallWnd[index]=hWnd; rP^TN^bd|  
   HotKey[index]=cKey; 2qs>Bshf  
   HotKeyMask[index]=cMask; FG DGWcRw~  
   bAdded=TRUE; eK Z@ FEZ  
   KeyCount++; |+Hp+9J  
   break; e-CNQnO~  
  } X$7Oo^1;  
 } h&=O-5  
 return bAdded; GSMk\9SI  
} P+)qE6\  
w24{_ N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) X(Y#9N"  
{ P"(z jG9-  
 BOOL bRemoved=FALSE; heE}_,$|  
 for(int index=0;index<MAX_KEY;index++){ ia%z+:G  
  if(hCallWnd[index]==hWnd){ d5@X#3Hd  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ADv^eJJ|  
    hCallWnd[index]=NULL; DS#c m3  
    HotKey[index]=0; w/b>awI  
    HotKeyMask[index]=0; v2 29H<  
    bRemoved=TRUE; _ztZ> '  
    KeyCount--; ,op]-CY 5  
    break; g>2aIun_Q  
   } GVmC }>z  
  } 0bMoUy*q  
 } fD1?z"lo  
 return bRemoved; ;y>S7n>n:  
} O1GDugZ  
~L- 0~  
void VerifyWindow() A}t%;V2  
{ NFk}3w:  
 for(int i=0;i<MAX_KEY;i++){ +h0PR?  
  if(hCallWnd!=NULL){ s kN9O"^A  
   if(!IsWindow(hCallWnd)){ $> "J"IX  
    hCallWnd=NULL; k: b/Gq`  
    HotKey=0; +hE',i.  
    HotKeyMask=0; bA}AD`5  
    KeyCount--; {Ge+O<mD  
   } z]^+^c_  
  } 2 ;JQX!  
 } Vy-28icZ`  
} '3A+"k-}mh  
2O eshkE  
BOOL CHookApp::InitInstance() K(<$.  
{ 8zhBA9Y#~  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); OF c\fW#  
 hins=AfxGetInstanceHandle(); ojHhT\M`  
 InitHotkey(); !Y ( apVQ  
 return CWinApp::InitInstance(); t#C,VwMe[  
} !Eq#[Gs  
>^a$  
int CHookApp::ExitInstance() YEzU{J  
{ 6cJ<9i &  
 VerifyWindow(); ` ^DjEdUN  
 UnInit(); rwiw Rh  
 return CWinApp::ExitInstance(); `E@kFJ(<On  
} 8wr8:( Y$  
\gLxC  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file k`Nyi )AGe  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) t/}L36@+  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 'It?wB W  
#if _MSC_VER > 1000 B[r<m J  
#pragma once vxZg &SRK  
#endif // _MSC_VER > 1000 > 2#%$lX6  
'"y}#h__T  
class CCaptureDlg : public CDialog Yc^%zxub  
{ -<_QF82  
 // Construction 6?N4l ]l  
 public: O|QUNr9  
  BOOL bTray; >R!"P[*  
  BOOL bRegistered; l^\(ss0~  
  BOOL RegisterHotkey(); U4BqO :sd  
  UCHAR cKey; bmu6@jT  
  UCHAR cMask; "e 1wr  
  void DeleteIcon(); / s,tY74'5  
  void AddIcon(); e@E17l-  
  UINT nCount; dL-i)F  
  void SaveBmp(); 6^)rv-L~5y  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 5F2_xH$5  
  // Dialog Data *ZaaO^!  
  //{{AFX_DATA(CCaptureDlg) GcT;e5D  
  enum { IDD = IDD_CAPTURE_DIALOG }; SxJ$b  
  CComboBox m_Key; l3.  
  BOOL m_bControl; iv*V#J>  
  BOOL m_bAlt; T-'~?[v  
  BOOL m_bShift; ow$q7uf  
  CString m_Path; kY"KD22a  
  CString m_Number; F$Hx`hoy  
  //}}AFX_DATA "+)K |9T#  
  // ClassWizard generated virtual function overrides OO nX`  
  //{{AFX_VIRTUAL(CCaptureDlg) 3X;{vO\a1  
 public: gxwo4.,  
  virtual BOOL PreTranslateMessage(MSG* pMsg);  FZ F @  
 protected: [#Y' dFQ  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ciudRK63M  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); uRE*%d>  
  //}}AFX_VIRTUAL )P?IqSEA%  
  // Implementation ?c]n^GvG  
 protected: )tS-.PrA-  
  HICON m_hIcon; WK0C  
  // Generated message map functions t V03+&jF  
  //{{AFX_MSG(CCaptureDlg) kZLMtj-   
  virtual BOOL OnInitDialog(); 4U=75!>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Z<U>A   
  afx_msg void OnPaint(); ]ab#q=  
  afx_msg HCURSOR OnQueryDragIcon(); XM/vDdR  
  virtual void OnCancel(); Tkw;pb  
  afx_msg void OnAbout(); LH2PTW\b!6  
  afx_msg void OnBrowse(); }u%"$[I}  
  afx_msg void OnChange(); |S&5es-yW  
 //}}AFX_MSG EF#QH _X  
 DECLARE_MESSAGE_MAP() 87V1#U^  
}; UL( lf}M  
#endif j?6X1cMq  
2C$R4:Ssw)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file & ze>X  
#include "stdafx.h" (CJ.BHu]  
#include "Capture.h" tu0aD%C  
#include "CaptureDlg.h" \}5p0.=  
#include <windowsx.h> d,0 }VaY=D  
#pragma comment(lib,"hook.lib") PE"v*9k  
#ifdef _DEBUG Ya#h'+}  
#define new DEBUG_NEW paW@\1Q  
#undef THIS_FILE .$!{-v[  
static char THIS_FILE[] = __FILE__; eS'yGY0b  
#endif fKHE;A*>%  
#define IDM_SHELL WM_USER+1 GaekFbW)  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); y<- _(^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); JBC$Ku  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; t P"\J(x  
class CAboutDlg : public CDialog u,1}h L  
{ +/rH(Ni  
 public: ,qQG;w,m  
  CAboutDlg(); oH#v6{y  
  // Dialog Data Pm+tQ  
  //{{AFX_DATA(CAboutDlg) kM/Te{<  
  enum { IDD = IDD_ABOUTBOX }; EpYy3^5d  
  //}}AFX_DATA UG;Y^?Ppe5  
  // ClassWizard generated virtual function overrides x;LzG t:w  
  //{{AFX_VIRTUAL(CAboutDlg) ?+0GfIV  
 protected: 9zBMlc$X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support X[](Kj^`<  
  //}}AFX_VIRTUAL nXA\|c0  
  // Implementation QAPu<rdJP  
 protected: g&Vcg`  
  //{{AFX_MSG(CAboutDlg) ?wb+L  
  //}}AFX_MSG X^@ I].  
  DECLARE_MESSAGE_MAP() 17|np2~  
}; pI.+"Hz  
=IU*}>#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) I.'b'-^  
{ HYK!}&  
 //{{AFX_DATA_INIT(CAboutDlg) *Dmx&F=3,5  
 //}}AFX_DATA_INIT yxt[= C  
} yX!HZu;j  
l [GOs&D1  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) jS.g]k  
{  \ %=9  
 CDialog::DoDataExchange(pDX); F {+`uG  
 //{{AFX_DATA_MAP(CAboutDlg) r?/A?DMe  
 //}}AFX_DATA_MAP TUIk$U?/I  
} IA&L]  
@n&<B`/  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) I$t3qd{H&  
 //{{AFX_MSG_MAP(CAboutDlg) _>m-AI4^  
 // No message handlers 44ed79ly0)  
 //}}AFX_MSG_MAP q.#[TI ^  
END_MESSAGE_MAP() ccFn.($p?,  
.w?(NZ2~  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 69K{+|  
: CDialog(CCaptureDlg::IDD, pParent) d XHB#  
{ .7NNT18  
 //{{AFX_DATA_INIT(CCaptureDlg) & fC!(Oy  
  m_bControl = FALSE; ao" %WX  
  m_bAlt = FALSE; Sh6JF574T  
  m_bShift = FALSE; +pm[f["C.  
  m_Path = _T("c:\\"); I6!5Yj]O"  
  m_Number = _T("0 picture captured."); cO2& VC  
  nCount=0; >EsziRm  
  bRegistered=FALSE; 4mjgt<`  
  bTray=FALSE; Y-mK+1 2  
 //}}AFX_DATA_INIT LhXUm  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 WLa!.v>  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;< jbLhHwD  
} Yap?^&GV  
G!N{NCq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) RyJ 1mAC  
{ )d\ j I  
 CDialog::DoDataExchange(pDX); (>4aibA'P  
 //{{AFX_DATA_MAP(CCaptureDlg) :~Q!SL N  
  DDX_Control(pDX, IDC_KEY, m_Key); H5CR'Rp  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Kv'n:z7Md  
  DDX_Check(pDX, IDC_ALT, m_bAlt); WtulTAfN  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [#Lc]$  
  DDX_Text(pDX, IDC_PATH, m_Path); #11NPo9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); )4>2IQ  
 //}}AFX_DATA_MAP J7D}%  
} f3j{VN  
GQQ.OvEc  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 9>zcBG8f  
//{{AFX_MSG_MAP(CCaptureDlg) j$UV/tp5T  
 ON_WM_SYSCOMMAND() @`opDu!  
 ON_WM_PAINT() :2 >hoAJJ  
 ON_WM_QUERYDRAGICON() 0Sq][W=  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) '>$EOg"  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) X,aYK;q%z  
 ON_BN_CLICKED(ID_CHANGE, OnChange) \0l>q ,  
//}}AFX_MSG_MAP FWue;pw3  
END_MESSAGE_MAP() ).` S/F  
D\w h;r  
BOOL CCaptureDlg::OnInitDialog() {rfF'@[  
{ DS-0gVYeDW  
 CDialog::OnInitDialog(); 8$s9(n-_Y  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); tM-^<V&  
 ASSERT(IDM_ABOUTBOX < 0xF000); VErv;GyV  
 CMenu* pSysMenu = GetSystemMenu(FALSE); h&.wo !  
 if (pSysMenu != NULL) 7]xm2CHx5  
 { ]M/9#mD9~  
  CString strAboutMenu; RIu~ @  
  strAboutMenu.LoadString(IDS_ABOUTBOX); hz;|NW{u  
  if (!strAboutMenu.IsEmpty()) Z/x*Y#0@n  
  { 4(}J.-B  
   pSysMenu->AppendMenu(MF_SEPARATOR); D(p\0V  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Jd\apBIf  
  } 9)xUA;Qw?z  
 } 9Zry]$0~R  
 SetIcon(m_hIcon, TRUE); // Set big icon NN0$}acp  
 SetIcon(m_hIcon, FALSE); // Set small icon Uoya3#4 G  
 m_Key.SetCurSel(0); [ EFMu;q  
 RegisterHotkey(); iovfo2!hD  
 CMenu* pMenu=GetSystemMenu(FALSE); ~DRmON5 M  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "mL++>ZSQ  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); c4&'D;=  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 73{'k K  
 return TRUE; // return TRUE unless you set the focus to a control Q9}dHIe1E  
} DRqZ,[!+  
o1&:ry  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) I;5R2" 3  
{ 8[r9HC  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )jWO P,|  
 { (,^*So/  
  CAboutDlg dlgAbout; .=m,hu~  
  dlgAbout.DoModal(); x!\ONF5$  
 } oH0X<'  
 else M(#m0x B  
 { u2oKH{/z  
  CDialog::OnSysCommand(nID, lParam); ikWtC]y  
 } DeR='7n  
} <YA&Dr3OD  
(~zd6C1.  
void CCaptureDlg::OnPaint() K{n{KB&_&  
{ G} eUL|S  
 if (IsIconic()) 8WE{5#oi  
 { 0 a]/%y3V  
  CPaintDC dc(this); // device context for painting ??TMSH  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); QL6C,#6  
  // Center icon in client rectangle Kp+CH7I*  
  int cxIcon = GetSystemMetrics(SM_CXICON); Rqwzh@}  
  int cyIcon = GetSystemMetrics(SM_CYICON); vR0 ];{  
  CRect rect; cvwhSdZu8  
  GetClientRect(&rect); ZmOfEg|h\  
  int x = (rect.Width() - cxIcon + 1) / 2; l3N I$Z u  
  int y = (rect.Height() - cyIcon + 1) / 2; G'YH6x,  
  // Draw the icon w9 w%&{j  
  dc.DrawIcon(x, y, m_hIcon); XLMb=T~S  
 } *yl>T^DjTC  
 else hOhS)  
 { S+TOSjfis  
  CDialog::OnPaint(); s2j['g5  
 } ngj,x7t  
} )%!XSsY.N|  
u?s VcD[  
HCURSOR CCaptureDlg::OnQueryDragIcon() ng:Q1Q9N  
{ wts=[U`(  
 return (HCURSOR) m_hIcon; JdZ+Hp3.  
} d #jK=:eK  
L 8{\r$  
void CCaptureDlg::OnCancel() CK, 6ytB  
{ Ltjbxw"Qd  
 if(bTray) jA#/Z  
  DeleteIcon(); [r/k% <  
  CDialog::OnCancel(); 2lL,zFAq  
} '+j} >Q  
A(]H{>PMy  
void CCaptureDlg::OnAbout() jqr1V_3(  
{ ]kG(G%r|M  
 CAboutDlg dlg; <F11m(  
 dlg.DoModal(); i-yy/y-N  
} 8w({\=  
Lg"C]  
void CCaptureDlg::OnBrowse() )Ud-}* g  
{ ?f/n0U4w  
 CString str; =_YG#yS  
 BROWSEINFO bi; AyMd:5;  
 char name[MAX_PATH]; ko5V9Drc  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Vf(6!iRP@  
 bi.hwndOwner=GetSafeHwnd(); Wu)>U  
 bi.pszDisplayName=name; R *F l8   
 bi.lpszTitle="Select folder"; jD7NblX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; lsN~*q?~]  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); t43)F9!  
 if(idl==NULL) u{["50~  
  return; 1>L(ul(qGF  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); a1Qv@p^._b  
 str.ReleaseBuffer(); /  g 2b  
 m_Path=str; eW|^tH  
 if(str.GetAt(str.GetLength()-1)!='\\') r H~" 4  
  m_Path+="\\"; '=P7""mN5  
 UpdateData(FALSE); LkQX?2>]  
} l3 DYg  
7t.!lh5G%  
void CCaptureDlg::SaveBmp() 7 I>G{  
{ A=Ss6 -Je  
 CDC dc; Fv<`AU  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~)(\6^&=|  
 CBitmap bm; Pb*5eXk  
 int Width=GetSystemMetrics(SM_CXSCREEN); XV^1tX>f{  
 int Height=GetSystemMetrics(SM_CYSCREEN); .KdyJ6o  
 bm.CreateCompatibleBitmap(&dc,Width,Height); GRY2?'`  
 CDC tdc; "--t e  
 tdc.CreateCompatibleDC(&dc); 0?>dCu\  
 CBitmap*pOld=tdc.SelectObject(&bm); }pJwj  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Y3O#Q)-j$  
 tdc.SelectObject(pOld); aN(|'uO@  
 BITMAP btm; }- Wa`t7U  
 bm.GetBitmap(&btm); I" KN"v^  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; yV^s,P1  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *YlV-C<}W"  
 BITMAPINFOHEADER bih; FN[{s  
 bih.biBitCount=btm.bmBitsPixel; EAeqLtFqs  
 bih.biClrImportant=0; o: ;"w"G  
 bih.biClrUsed=0; ;V<fB/S.=+  
 bih.biCompression=0; Gm\/Y:U  
 bih.biHeight=btm.bmHeight; "9n3VX)  
 bih.biPlanes=1; vv=VRhwF  
 bih.biSize=sizeof(BITMAPINFOHEADER); +o9":dl  
 bih.biSizeImage=size; 8n>9;D5n  
 bih.biWidth=btm.bmWidth; gy nh#&r  
 bih.biXPelsPerMeter=0; u,6~qQczE  
 bih.biYPelsPerMeter=0; ?@V[#.  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); PiA0]>  
 static int filecount=0; 7NJhRz`_  
 CString name; L5,NP5RC  
 name.Format("pict%04d.bmp",filecount++); HbW0wuI  
 name=m_Path+name; B7!3-1<k>  
 BITMAPFILEHEADER bfh; QVtQx>K`  
 bfh.bfReserved1=bfh.bfReserved2=0; 50={%R  
 bfh.bfType=((WORD)('M'<< 8)|'B'); ,{c?ymw?  
 bfh.bfSize=54+size; Q1+dCCY#F  
 bfh.bfOffBits=54; ,TFIG^Dvq  
 CFile bf; s-v  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #f+$Ddg*  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); l'eyq}&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !50[z:  
  bf.WriteHuge(lpData,size); ghRVso(  
  bf.Close(); %Z1N;g0  
  nCount++; ye MB0Z*r  
 } hvaSH69*m  
 GlobalFreePtr(lpData); !@v7Zu43,  
 if(nCount==1) X*\ J_  
  m_Number.Format("%d picture captured.",nCount); K1T4cUo  
 else yNTK .  
  m_Number.Format("%d pictures captured.",nCount); )KAEt.  
  UpdateData(FALSE); :eCU/BC4  
} OE-gC2&Bm  
o !U 6?  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) GI1  
{ 8Q'0h m?  
 if(pMsg -> message == WM_KEYDOWN) :*KHx|Q  
 { &oX>* 6L  
  if(pMsg -> wParam == VK_ESCAPE) J_4!2v!6e  
   return TRUE; >=-(UA  
  if(pMsg -> wParam == VK_RETURN) <q@a~'Ai?!  
   return TRUE; Dbz3;t  
 } 9c("x%nLpB  
 return CDialog::PreTranslateMessage(pMsg); ~5oPpTAe  
} ^=-y%kp"  
XD2v*l|Po  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) :Cj OPl  
{ rQ qW_t%  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ]'=)2 .}  
  SaveBmp(); W@I|Q -  
  return FALSE; {fjdr  
} 7](KV"%V  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~S,,w1`  
 CMenu pop; fNW"+ <W  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); XMu9Uk{|  
 CMenu*pMenu=pop.GetSubMenu(0); lE(a%'36  
 pMenu->SetDefaultItem(ID_EXITICON); &n8_0|gK  
 CPoint pt; /$p6'1P8  
 GetCursorPos(&pt); |M, iM]  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); !'9Feoez  
 if(id==ID_EXITICON) b?lD(fa&  
  DeleteIcon(); .E8_Oz  
 else if(id==ID_EXIT) '$ t  
  OnCancel(); lSVp%0jR  
 return FALSE; !`Hd-&}bYz  
} 6"&6 `f  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); +Z !)^j  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ]Hefm?9*^  
 AddIcon(); GQUe!G9  
 return res; {ix?Brq/  
} IS&ZqE(`e  
Ssou  
void CCaptureDlg::AddIcon() D!Pq4'd(  
{ Zy?Hi`  
 NOTIFYICONDATA data; n%.7h3  
 data.cbSize=sizeof(NOTIFYICONDATA); m!tbkZHQn0  
 CString tip; }o?APvd  
 tip.LoadString(IDS_ICONTIP); E%,^Yvh/  
 data.hIcon=GetIcon(0); zkuU5O  
 data.hWnd=GetSafeHwnd(); jN;@=COi  
 strcpy(data.szTip,tip); CFMo)"  
 data.uCallbackMessage=IDM_SHELL; Rnr(g;2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ] [+#;avU  
 data.uID=98; zck#tht4 n  
 Shell_NotifyIcon(NIM_ADD,&data); xqG[~)~  
 ShowWindow(SW_HIDE);  ~- _kM  
 bTray=TRUE; SwTL|+u  
} V k  K  
0zlb0[  
void CCaptureDlg::DeleteIcon() F@'Jbd`   
{ 6z#acE1)M  
 NOTIFYICONDATA data; 7XTkX"zKj  
 data.cbSize=sizeof(NOTIFYICONDATA); z"-u95H  
 data.hWnd=GetSafeHwnd();  8pIP  
 data.uID=98; S >X:ZYYC  
 Shell_NotifyIcon(NIM_DELETE,&data); "/3'XOK|  
 ShowWindow(SW_SHOW); hIs4@0  
 SetForegroundWindow(); (_mnB W  
 ShowWindow(SW_SHOWNORMAL); }@'$b<!B  
 bTray=FALSE; pN:Kdi  
} V3Q+s8OIF  
{JZZZY!n2  
void CCaptureDlg::OnChange() QwJV S(Gs4  
{ cl[BF'.H  
 RegisterHotkey(); ([T>.s  
} f332J  
1 d}Z(My  
BOOL CCaptureDlg::RegisterHotkey() ZM !CaR  
{ dx5#\"KX=,  
 UpdateData(); |[<_GQl  
 UCHAR mask=0; GK )?YM  
 UCHAR key=0; "}u.v?HYz  
 if(m_bControl) Xx."$l  
  mask|=4; :~e>Ob[,"  
 if(m_bAlt) vM*-D{  
  mask|=2; +7D|4  
 if(m_bShift) Z &Pg"a?\  
  mask|=1; @=bLDTx;c)  
  key=Key_Table[m_Key.GetCurSel()]; "CSsCA$/  
 if(bRegistered){ !"HO]3-o  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); qON|4+~u%  
  bRegistered=FALSE; ,&]S(|2%>t  
 } twL3\ }N/B  
 cMask=mask; >Wm `v.-  
 cKey=key; #I{h\x><?  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); @Lpq~ 1eZB  
 return bRegistered; #|Y5,a ,{  
} AF;)#T<  
8p^bD}lN7  
  四、小结 tX9{hC^  
Y}t \4 di  
  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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