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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: [-&L8Un  
  dd?x(,"A`  
  一、实现方法 tBTTCwNT%  
pfx3C*  
  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: $3Z-)m  
O D Ur  
#pragma data_seg("shareddata") &V>fYgui  
HHOOK hHook =NULL; //钩子句柄 E;21?`x5  
UINT nHookCount =0; //挂接的程序数目 X(jVRr_m9  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 lTU$0CG  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 $A3<G-4O  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 47r_y\U h  
static int KeyCount =0; jGrN\D?h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X0 -IRJ[  
#pragma data_seg() 2oJb)CB  
1<ro7A4hK  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 *&Z7m^`FQ  
OT^%3:zg  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: TpA\9N#$  
mAk{"65V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR nUq<TJ  
cKey,UCHAR cMask) `.y}dh/+0W  
{ iYnEwAoN;  
 BOOL bAdded=FALSE; VF&Z%O3n  
 for(int index=0;index<MAX_KEY;index++){ VL' fP2  
  if(hCallWnd[index]==0){ Pmi#TW3X  
   hCallWnd[index]=hWnd; 2iu_pjj  
   HotKey[index]=cKey; vpPl$ga5bY  
   HotKeyMask[index]=cMask; zi~5l#I  
   bAdded=TRUE; fjnTe  
   KeyCount++; B*htN  
   break; Ifk#/d  
  } #k3t3az2{  
 } c:83LZ  
 return bAdded; H' T  
} zo;^m|  
//删除热键 ? muzU.h"z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g~UUP4<$"  
{ y]%w)4PS  
 BOOL bRemoved=FALSE; ,wKe fpV;5  
 for(int index=0;index<MAX_KEY;index++){ */ G<!W  
  if(hCallWnd[index]==hWnd){ _WX#a|4h{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 7^} Ll@  
    hCallWnd[index]=NULL; QrApxiw  
    HotKey[index]=0; kF7(f|*  
    HotKeyMask[index]=0; ?Z\Yu'  
    bRemoved=TRUE; J==SZ v  
    KeyCount--; !~_zm*CqbZ  
    break; _w@qr\4i=  
   } $ _8g8r}  
  } JcJmds  
 } ~-a'v!  
 return bRemoved; k {-  
} %7Kooq(i  
j?b\+rr  
\qsw"B*tv`  
  DLL中的钩子函数如下: qDWsvx]  
M(|   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eUS   
{ Ou'?]{  
 BOOL bProcessed=FALSE; >Ps7I  
 if(HC_ACTION==nCode) fIoIW&iy  
 { 4 !`bZ`_Bw  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 H* !EP  
   switch(wParam) 5)1+~B  
   {  y( r1I[W'  
    case VK_MENU: P`U<7xF~  
     MaskBits&=~ALTBIT; mq/zTm  
     break; iq?#rb P#I  
    case VK_CONTROL: Ct$82J  
     MaskBits&=~CTRLBIT; #s5 pz8v  
     break; `,wu}F85  
    case VK_SHIFT: F{k+7Ftc  
     MaskBits&=~SHIFTBIT; m}VM+=  
     break; Fb2%!0i  
    default: //judge the key and send message WUAJjds  
     break; <<MjC5  
   } mxrG)n6Y  
   for(int index=0;index<MAX_KEY;index++){ yh;Y,;4  
    if(hCallWnd[index]==NULL) rl:KJ\*D  
     continue; 8OWmzY_=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8YY|;\F)J~  
    { Hv#q:R8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); B~r}c4R{7  
     bProcessed=TRUE; B%<e FFV\  
    } BpAB5=M0  
   } Z\X'd_1!  
  } x_@i(oQ:_  
  else if((lParam&0xc000ffff)==1){ //有键按下 "u}9@}*  
   switch(wParam) zxD,E@lF  
   { bv?0.{Z  
    case VK_MENU: t[.W$1=  
     MaskBits|=ALTBIT; +R$?2  
     break; `ZHP1uQ<  
    case VK_CONTROL: n1(?|aJ#1  
     MaskBits|=CTRLBIT; M\/XP| 7  
     break; ^. X[)U  
    case VK_SHIFT: lH BI  
     MaskBits|=SHIFTBIT; _rQUE ^9  
     break; )&NAs  
    default: //judge the key and send message ^kj=<+ v#  
     break; @ "d2.h  
   } W|Ldu;#  
   for(int index=0;index<MAX_KEY;index++){ g%J./F=@3  
    if(hCallWnd[index]==NULL) gqiXmMm:9  
     continue; ,j9 80/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) pD`/_-=^h  
    { oC dGQ7G}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); * UcjQ  
     bProcessed=TRUE; #0 y <a:}R  
    } a#(U2OP  
   } c;!g  
  } G\H q/4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 2YQ#-M  
   for(int index=0;index<MAX_KEY;index++){ n`5WXpz4;  
    if(hCallWnd[index]==NULL) mVf.sA8  
     continue; hYt7kq!"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) HFh /$VM  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); fp !:u  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 = t+('  
   } ~@M7&%]  
  } )LFD6\z1pl  
 } V:^H4WvL\W  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .P/xs4  
} Zw=G@4xoU  
jPwef##~7  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: OXtBJYe  
PZ]5Hf1"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qzdaN5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `7B14:\A  
26nBBS,;  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Z`xyb>$  
K`+vfqX  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) x`2pr  
{ .ev\M0Dt  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 75Fp[Q-  
 { x-~-nn\O  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :uR>UDlPX  
  SaveBmp(); /#\?1)jCK  
  return FALSE; rt;gC[3\  
 } lZ a?Y@  
 …… //其它处理及默认处理 wO.B~`y  
} cju@W]!  
24|<<Xn  
S~&\o\"5  
  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。 c% yh(g  
<j"O%y.  
  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。 rgT%XhUS6f  
cUM_ncYOP  
  二、编程步骤 @ V5S4E  
wz@/5c/u  
  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"; !h/dZ`#  
cUV TRWV  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -&7=uRQk  
|$w0+bV*  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; o3= .T+B  
m`a>,%}P"  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; *vXDuhQ  
_X?y ,#  
  5、 添加代码,编译运行程序。 C&FN#B  
]nHe$x!2]  
三、程序代码 [BE:+ ID3  
o] S`+ZcV  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL q"l>`KCG`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) a(g$ d2H  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \|Y{jG<cu  
#if _MSC_VER > 1000 |y'b21 7t  
#pragma once <EOg,"F  
#endif // _MSC_VER > 1000 i!y\WaCp  
#ifndef __AFXWIN_H__ ~|qXtds$  
#error include 'stdafx.h' before including this file for PCH - Ra\^uz  
#endif QZ:v  
#include "resource.h" // main symbols k\%,xf; x  
class CHookApp : public CWinApp )*+u\x_Hx  
{ @eA %(C  
 public: 9PWm@ Nlf  
  CHookApp(); @s3aR*ny$  
  // Overrides f};!m=b  
  // ClassWizard generated virtual function overrides \(wn@/yP'  
  //{{AFX_VIRTUAL(CHookApp) .;cxhgU  
 public: (PyTq 5:F  
  virtual BOOL InitInstance(); pEJ#ad  
  virtual int ExitInstance(); yr (g~MQ  
  //}}AFX_VIRTUAL 4$qNcMdz  
  //{{AFX_MSG(CHookApp) 7B VXBw  
  // NOTE - the ClassWizard will add and remove member functions here. ;}$Z 80  
  // DO NOT EDIT what you see in these blocks of generated code ! G!-7ic_4  
  //}}AFX_MSG #R5we3&p  
  DECLARE_MESSAGE_MAP() Bd/} %4V\@  
}; !XkymIX~O.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); :Xh_$4~^Y  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 5F% h>tqh  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~r{\WZ.  
BOOL InitHotkey(); +.XZK3  
BOOL UnInit(); ,s\x]bh  
#endif ab8oMi`z  
(9Fabo\SH  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |Gf1^8:C9  
#include "stdafx.h" "``W6W-(  
#include "hook.h" &Bj,.dD/a  
#include <windowsx.h> jdV .{8@  
#ifdef _DEBUG :<'i-Ur8  
#define new DEBUG_NEW cfrvy^>,  
#undef THIS_FILE Kx(76_XD  
static char THIS_FILE[] = __FILE__; u^j8 XOT  
#endif tjBh$)  
#define MAX_KEY 100 H5 p}Le  
#define CTRLBIT 0x04 YlZYS'_  
#define ALTBIT 0x02 CwTS/G  
#define SHIFTBIT 0x01 !D.= 'V  
#pragma data_seg("shareddata") JL}hOBqfI  
HHOOK hHook =NULL; lBizC5t!o  
UINT nHookCount =0; Td["l!-fe  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey J dk3) \  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT uzzWZ9Tv  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Fi,e}j=2f  
static int KeyCount =0; se^NQ=  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift `'A(`. CL  
#pragma data_seg() %J/fg<W1  
HINSTANCE hins; k;"R y8[k  
void VerifyWindow(); -D&.)N9ctQ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) -dc"N|.  
//{{AFX_MSG_MAP(CHookApp) ;PP_3`  
// NOTE - the ClassWizard will add and remove mapping macros here. w /Bn2bD  
// DO NOT EDIT what you see in these blocks of generated code! 60U{ e}Mkb  
//}}AFX_MSG_MAP "/ a*[_sV  
END_MESSAGE_MAP() PMz{8 F  
Ti9:'I  
CHookApp::CHookApp() Qwp\)jVi  
{ !%Z)eO~Z  
 // TODO: add construction code here, n6}E4Eno  
 // Place all significant initialization in InitInstance O&rD4#  
} 6.`}&E  
|2t7G9[n  
CHookApp theApp; 34+)-\xt:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) p ?Ij-uo"o  
{ OTNZ!U/)j  
 BOOL bProcessed=FALSE; .NNcc4+  
 if(HC_ACTION==nCode) &dwI8@&  
 { e@2E0u4  
  if((lParam&0xc0000000)==0xc0000000){// Key up Q)%8NVs  
   switch(wParam) [`Qp;_K?t  
   { 0%q ctZy  
    case VK_MENU: @]y{M;  
     MaskBits&=~ALTBIT; "S{6LWkD  
     break; v4,syd*3|V  
    case VK_CONTROL: YfrTvKX  
     MaskBits&=~CTRLBIT; bz}AO))Hk  
     break; l b1sV  
    case VK_SHIFT: '^.=gTk  
     MaskBits&=~SHIFTBIT;  ycAi(K  
     break; %DND&0`  
    default: //judge the key and send message )z4kP09  
     break; Vbqm]2o&  
   } -; /@;W  
   for(int index=0;index<MAX_KEY;index++){ c@ZkX]g  
    if(hCallWnd[index]==NULL) i-"h"nF"  
     continue; 0-&s J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ph! KL\  
    { K9z_=c+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *C:q _/  
     bProcessed=TRUE; ;hfG$ {l;  
    } :;hBq4h  
   }  ]5)&36  
  } /kviO@jm4(  
  else if((lParam&0xc000ffff)==1){ //Key down BB73' W8y  
   switch(wParam) ETH#IM8J  
   { !i"9f_  
    case VK_MENU: $nD k mKl  
     MaskBits|=ALTBIT; (EF$^FYPK  
     break; omUl2C  
    case VK_CONTROL: >* Qk~kv<%  
     MaskBits|=CTRLBIT; ;KjMZ(Iil1  
     break; 4S{l>/I  
    case VK_SHIFT: "*>QxA%c4  
     MaskBits|=SHIFTBIT; 0wE8Gm G  
     break; ZsK'</7  
    default: //judge the key and send message C6T 9  
     break; $gD(MKR)~  
   } ?$8 ,j+&I  
   for(int index=0;index<MAX_KEY;index++) aid)q&AcQ  
   { B8#f^}8  
    if(hCallWnd[index]==NULL) DkMC!Q\  
     continue; ;uo|4?E:\(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) QX~72X=(  
    { ()IgSj?,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); m5Laq'~0_  
     bProcessed=TRUE; r@V(w`  
    } s].Cx4VQ  
   } Pc:'>,3!V3  
  } Mud\Q["  
  if(!bProcessed){ w!Lb;4x ?  
   for(int index=0;index<MAX_KEY;index++){ =VI`CBQ/Um  
    if(hCallWnd[index]==NULL) ~|d?o5W  
     continue; /)<7$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) P6Z,ci17  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); GISI8W^  
   } ,4I6RwB.  
  } 2!& ;ZcT,  
 } NZ? =pfK\s  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Vblf6qaBs  
} k/rkJ|i+p  
]$k m  
BOOL InitHotkey() nLLHggNAV  
{ ?=o]Wx0(9  
 if(hHook!=NULL){ ,3TD $2};.  
  nHookCount++; "Q!{8 9Y  
  return TRUE; 8{^GC(W{]  
 } Z`h_oK#y15  
 else ;7{wa]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 8k}CR)3@C  
  if(hHook!=NULL) `)_FO]m}jS  
   nHookCount++; _5 -"<  
  return (hHook!=NULL); jtCob'n8  
} WED7]2>  
BOOL UnInit() lt2& uYgp  
{ ?O]gFn  
 if(nHookCount>1){ E)SOcM)  
  nHookCount--; +K4v"7C V  
  return TRUE; e"09b<69  
 } a'.=.eDQ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); h.%Qn vL  
 if(unhooked==TRUE){ E0'6!9y  
  nHookCount=0; bJ[1'Es `  
  hHook=NULL; E 4(muhY  
 } C'"6@-~  
 return unhooked; ?AH<y/i<Y  
} g4932_tC  
JIkmtZv  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) .j,&/y&  
{ v<4X;4p^  
 BOOL bAdded=FALSE; uATRZMai  
 for(int index=0;index<MAX_KEY;index++){ 2^j9m}`  
  if(hCallWnd[index]==0){ cA^7}}?e  
   hCallWnd[index]=hWnd; 0 N^V&k   
   HotKey[index]=cKey; eS+LFS7*k  
   HotKeyMask[index]=cMask; ;]e"bX  
   bAdded=TRUE; e1a%Rj~  
   KeyCount++; %iML??S  
   break; DA\O,^49h  
  } F:U_gW?  
 } cZ,_O~  
 return bAdded; od|.E$B  
}  ,1kV9_x  
M>#S z  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) w|ei*L  
{ ]+S QS^4  
 BOOL bRemoved=FALSE; n*uZ=M_/Q  
 for(int index=0;index<MAX_KEY;index++){ WNi<|A#T{  
  if(hCallWnd[index]==hWnd){ j_g9RmZT  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |0 VP^md  
    hCallWnd[index]=NULL; {,-#;A*yW  
    HotKey[index]=0; *l} 0x@  
    HotKeyMask[index]=0; Cm>F5$l{  
    bRemoved=TRUE; M>j)6?n`_  
    KeyCount--; $<#sCrNX  
    break; XDQ1gg`  
   } _XtY/7n  
  } NI)nf;C  
 } )}v2Z3:  
 return bRemoved; ^~od*:  
} ~+hG}7(:  
X35hLp8 M  
void VerifyWindow() cPSpPx  
{ 5kz`_\ &  
 for(int i=0;i<MAX_KEY;i++){ ^S @b*  
  if(hCallWnd!=NULL){ ,#{aAx|]  
   if(!IsWindow(hCallWnd)){ Zuf&maa S  
    hCallWnd=NULL; O!jCQ{ T  
    HotKey=0; M9nYt~vHX  
    HotKeyMask=0; jLg4_N1SD  
    KeyCount--; ^q$sCt}  
   } c"r( l~fc  
  } Vow+,,oh  
 } H{If\B%1t  
} z#b6 aP  
j.sf FS  
BOOL CHookApp::InitInstance() tFCeE=4%  
{ coBxZyM 1}  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); L '=3y$"],  
 hins=AfxGetInstanceHandle(); nBd;d}LD  
 InitHotkey(); (Y86q\DQ?|  
 return CWinApp::InitInstance(); ]v#Q\Q8>  
} B(hNBq7  
G9jtL$}E<  
int CHookApp::ExitInstance() 0T*jv! q>  
{ BTB,a$P/  
 VerifyWindow(); rz(DZV  
 UnInit(); 98l#+4 +  
 return CWinApp::ExitInstance(); e2>gQ p/  
} (Xx @_  
Z(#a-_ g  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V'8 (}(s/  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $%/Zm*H  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ iIg_S13  
#if _MSC_VER > 1000 aDs[\ '  
#pragma once 4&tY5m>  
#endif // _MSC_VER > 1000 Xo P]PR`cQ  
fYpy5vc-dm  
class CCaptureDlg : public CDialog 9,4a?.*4~  
{  u >x2  
 // Construction 9.<$&mVk7`  
 public: U`D"L4},.  
  BOOL bTray; F$.M2*9  
  BOOL bRegistered; ZC05^  
  BOOL RegisterHotkey(); e_Y>[/Om  
  UCHAR cKey; {oO!v}]  
  UCHAR cMask; xi^_C!*J  
  void DeleteIcon(); p[cC%3  
  void AddIcon(); <~3@+EEM  
  UINT nCount; zZ kwfF  
  void SaveBmp(); qk+:p]2  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor wEk9(|  
  // Dialog Data /#blXI  
  //{{AFX_DATA(CCaptureDlg) p< XjiRq  
  enum { IDD = IDD_CAPTURE_DIALOG }; k(et b#  
  CComboBox m_Key; CpA=DnZ  
  BOOL m_bControl; ~s+\Y/@A  
  BOOL m_bAlt; ).LJY<A  
  BOOL m_bShift; 6x_8m^+m  
  CString m_Path; F<o J  
  CString m_Number; _T H'v:C  
  //}}AFX_DATA a &j H9  
  // ClassWizard generated virtual function overrides g8^$,  
  //{{AFX_VIRTUAL(CCaptureDlg) qz?9:"~$C  
 public: U<Ag=vsZE  
  virtual BOOL PreTranslateMessage(MSG* pMsg); /6g*WX2P1  
 protected: 7z`)1^ M  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support pj'Yv  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ;vuok]@  
  //}}AFX_VIRTUAL 8g$pfHt|e  
  // Implementation eP6>a7gc  
 protected: fy7]I?vm@  
  HICON m_hIcon; eR?`o!@y  
  // Generated message map functions l{6fR(d ?  
  //{{AFX_MSG(CCaptureDlg) L_O m<LO2  
  virtual BOOL OnInitDialog(); %<P&"[F]v@  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); F@[l&`7  
  afx_msg void OnPaint(); ?z p$Wz;k  
  afx_msg HCURSOR OnQueryDragIcon(); {o AJL  
  virtual void OnCancel(); 7h0LR7  
  afx_msg void OnAbout(); dCN4aY[d  
  afx_msg void OnBrowse(); (zte'F4  
  afx_msg void OnChange(); bDRl}^aO6  
 //}}AFX_MSG eWE7>kwh  
 DECLARE_MESSAGE_MAP() bt"*@NJ$  
}; #Mrof9  
#endif s@V4ny9x  
>,7 -cm=.  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file F{v>   
#include "stdafx.h" ]9F$/M#  
#include "Capture.h" 22(7rUkI  
#include "CaptureDlg.h" vjmNS=l  
#include <windowsx.h> /c6:B5G  
#pragma comment(lib,"hook.lib") w a2?%y_G  
#ifdef _DEBUG y38x^fuYJ~  
#define new DEBUG_NEW <>%2HRn<u  
#undef THIS_FILE rUmaKh?v|X  
static char THIS_FILE[] = __FILE__; '9.L5*wh]  
#endif c>mTd{Abi  
#define IDM_SHELL WM_USER+1 k> SPtiAs  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); wO.T"x%X  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K !g!tA$  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; eaB6e@]@  
class CAboutDlg : public CDialog =^3 Z L  
{ > &tmdE  
 public: zO)Bf(  
  CAboutDlg(); 1L3 +KD~  
  // Dialog Data RA^6c![  
  //{{AFX_DATA(CAboutDlg) (J} tCqP  
  enum { IDD = IDD_ABOUTBOX }; NAgm?d  
  //}}AFX_DATA V96:+r  
  // ClassWizard generated virtual function overrides  2:GS(%~  
  //{{AFX_VIRTUAL(CAboutDlg)  r"YOA@  
 protected: &65I 6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @KJ~M3d0l  
  //}}AFX_VIRTUAL ZB+~0[C  
  // Implementation %^pm~ck!  
 protected: y8%QS*  
  //{{AFX_MSG(CAboutDlg) `]F}O \H  
  //}}AFX_MSG Xnc?oT+  
  DECLARE_MESSAGE_MAP() -RI&uFqOI  
}; Iw;i ".  
[jnA?Ge:  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) D4Z7j\3a  
{ e5 N$+P"  
 //{{AFX_DATA_INIT(CAboutDlg) ;suY  
 //}}AFX_DATA_INIT me@k~!e"z  
} .VXadgM  
#n_t5 O[  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) o#uhPUZ  
{ bUU\bc  
 CDialog::DoDataExchange(pDX); *)bh6b=7  
 //{{AFX_DATA_MAP(CAboutDlg) 6qR5A+|;  
 //}}AFX_DATA_MAP z?<Xx?Kk  
} p54 e'Zb  
0JE*|CtK  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ^^z_[Ih  
 //{{AFX_MSG_MAP(CAboutDlg) 4D)M_O  
 // No message handlers AGhr(\j  
 //}}AFX_MSG_MAP ovk^  
END_MESSAGE_MAP() dnzZ\t>U  
yYH>~,  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;iA$yw:  
: CDialog(CCaptureDlg::IDD, pParent) s:xt4<  
{ @Zzg^1Ilpu  
 //{{AFX_DATA_INIT(CCaptureDlg) {Q021*xt/  
  m_bControl = FALSE; ~--b#o{  
  m_bAlt = FALSE; 4Q(w D  
  m_bShift = FALSE; m`&6[[)6~  
  m_Path = _T("c:\\"); V~7Oa2'#B  
  m_Number = _T("0 picture captured."); .A F94OlE/  
  nCount=0; NQx>u  
  bRegistered=FALSE; af_b G;  
  bTray=FALSE; R-6km Tex>  
 //}}AFX_DATA_INIT Y;=GM:*H  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 DD'RSV5]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lm8<0*;,  
} Ssd7]G+n:  
PNpH)'C|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ? @- t.N  
{ v*&WqVg  
 CDialog::DoDataExchange(pDX); <z QUa  
 //{{AFX_DATA_MAP(CCaptureDlg) m!WDXt  
  DDX_Control(pDX, IDC_KEY, m_Key); |!cM_&  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Z8:'_#^@a[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); COL_c<\  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `08}y*E  
  DDX_Text(pDX, IDC_PATH, m_Path); j34lPo `  
  DDX_Text(pDX, IDC_NUMBER, m_Number); E9Hyd #A  
 //}}AFX_DATA_MAP 3J[ 5^  
} Vr KFpFd  
^,#MfF6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 6oLZH6fG  
//{{AFX_MSG_MAP(CCaptureDlg) Bg}(Sy  
 ON_WM_SYSCOMMAND() 4Y{&y6  
 ON_WM_PAINT() n==+NL  
 ON_WM_QUERYDRAGICON()  Fq!- %Y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ;m}o$`  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |#5_VEG  
 ON_BN_CLICKED(ID_CHANGE, OnChange) txix =  
//}}AFX_MSG_MAP -v~XS-F  
END_MESSAGE_MAP() p><DA fB  
`l-R?C?*!  
BOOL CCaptureDlg::OnInitDialog() xeSv+I-b  
{ }/VSIS@Z  
 CDialog::OnInitDialog(); m8 Ti{w(  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 5wI j:s  
 ASSERT(IDM_ABOUTBOX < 0xF000); &P(vm@*  
 CMenu* pSysMenu = GetSystemMenu(FALSE); yHxi^D]  
 if (pSysMenu != NULL) @l?2",  
 { g?9%_&/})A  
  CString strAboutMenu; JT*Pm"}  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~!ICBF~j  
  if (!strAboutMenu.IsEmpty()) CW@G(R  
  { &\Yd)#B/  
   pSysMenu->AppendMenu(MF_SEPARATOR); 8Og)(BC  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 7WN$ rl5/  
  } m@y_Wt  
 } 4(p,@e31  
 SetIcon(m_hIcon, TRUE); // Set big icon :snn-e0l  
 SetIcon(m_hIcon, FALSE); // Set small icon }>m3V2>[  
 m_Key.SetCurSel(0); 6'JP%~QlS  
 RegisterHotkey(); C<hb{$@  
 CMenu* pMenu=GetSystemMenu(FALSE); Ts 3(,Y  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); M5l*D'GE]  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); fZt3cE\  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); f/e2td*A  
 return TRUE; // return TRUE unless you set the focus to a control (N$$N:ac[t  
} Bk8 '*O/)  
'q*:+|"  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ppPzI,  
{ o/p'eY:)  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) .E0*lem'hE  
 { {y7,n  
  CAboutDlg dlgAbout; ;@I}eZ,f$  
  dlgAbout.DoModal(); -Q P&A >]7  
 } M ^~  
 else !Mk:rO-L  
 { ( ?pn2- Ip  
  CDialog::OnSysCommand(nID, lParam); Jul xFjC  
 } ^p!bteA>  
} 9{5 c}bX  
0-w^y<\  
void CCaptureDlg::OnPaint() 9 TILrK  
{ o*1t)HL<  
 if (IsIconic()) 7<c&)No;  
 { Eb=;D1)y]  
  CPaintDC dc(this); // device context for painting 3a#j&]  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4C_-MJI  
  // Center icon in client rectangle blA]z!FU  
  int cxIcon = GetSystemMetrics(SM_CXICON); L8j#l u  
  int cyIcon = GetSystemMetrics(SM_CYICON); JPTVZ  
  CRect rect; AAt<{  
  GetClientRect(&rect); zVs|go>F  
  int x = (rect.Width() - cxIcon + 1) / 2; #] 5|Qhrr+  
  int y = (rect.Height() - cyIcon + 1) / 2; Q.[^5 8  
  // Draw the icon #%g~fh  
  dc.DrawIcon(x, y, m_hIcon); iXDQ2&gE*  
 } CQNt  
 else @7 *Ag~MRb  
 { B.J4}Ua  
  CDialog::OnPaint(); >}ozEX6c2  
 } {bvm83{T  
} $W;IW$  
id.W"5+  
HCURSOR CCaptureDlg::OnQueryDragIcon() J8yi#A>+  
{ !j.jvI%e;  
 return (HCURSOR) m_hIcon; ;.r >  
} #Rdq^TGMi;  
weiqt *,8  
void CCaptureDlg::OnCancel() _"`U.!3*  
{ IK-E{,iKc  
 if(bTray) lYu1m  
  DeleteIcon(); ')w*c  
  CDialog::OnCancel(); KCed!OJ+  
} E$[\Fk}S  
V ;)q?ZHg  
void CCaptureDlg::OnAbout() [\&Mo]"0  
{ @.X}S "yr  
 CAboutDlg dlg; ^9UF Pij"  
 dlg.DoModal(); +mT}};-TS  
} Y2Y2>^  
FBcF  
void CCaptureDlg::OnBrowse()  G?]E6R  
{ Ga%]$4u  
 CString str; TUEEwDK-  
 BROWSEINFO bi; Xze   
 char name[MAX_PATH]; \6Ze H  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); [,a O*7 N  
 bi.hwndOwner=GetSafeHwnd(); 0 n,5"B  
 bi.pszDisplayName=name; BifA&o%  
 bi.lpszTitle="Select folder"; b~b(Ed{r  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; \wNn c"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 5e,Dk0d  
 if(idl==NULL) h& (@gU`A  
  return; /)de`k"  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); UUY-EC7X  
 str.ReleaseBuffer(); [JVI@1T  
 m_Path=str; ZZE  
 if(str.GetAt(str.GetLength()-1)!='\\') fwAN9zs  
  m_Path+="\\"; =tH+e7it  
 UpdateData(FALSE); AEnS_Q  
} FzpWT-jnDd  
G"TPu _g  
void CCaptureDlg::SaveBmp() gH\r# wy|  
{ Bw*z4qb{yH  
 CDC dc; d!KX.K\NM,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0v0Y( Mo@  
 CBitmap bm; :/vB,JC  
 int Width=GetSystemMetrics(SM_CXSCREEN); @mJN  
 int Height=GetSystemMetrics(SM_CYSCREEN); e^XijId.  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Ti3BlWQH  
 CDC tdc; {u.V8%8  
 tdc.CreateCompatibleDC(&dc); 0uU%jN$  
 CBitmap*pOld=tdc.SelectObject(&bm); 4&ea*w  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Sc6wC H  
 tdc.SelectObject(pOld); X=\ #n-*  
 BITMAP btm; C3@.75-E  
 bm.GetBitmap(&btm); F`I-G~e  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; a LmVOL{  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ? 3}UO:B  
 BITMAPINFOHEADER bih; Xe+&/J5b  
 bih.biBitCount=btm.bmBitsPixel; EJWMr`zdn  
 bih.biClrImportant=0; }7=a,1T  
 bih.biClrUsed=0; DhZtiqL#_  
 bih.biCompression=0; &{]%=stI  
 bih.biHeight=btm.bmHeight; @su{Uno8/  
 bih.biPlanes=1; qfSoF|  
 bih.biSize=sizeof(BITMAPINFOHEADER); fSqbGoIQ  
 bih.biSizeImage=size; f6L_u k`{  
 bih.biWidth=btm.bmWidth; zW0AB8l  
 bih.biXPelsPerMeter=0; &vMH AZd  
 bih.biYPelsPerMeter=0; :LBe{Jbw  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); q<yH!  
 static int filecount=0; %&_(IY$d  
 CString name; ($S{td;  
 name.Format("pict%04d.bmp",filecount++); doR'=@ W  
 name=m_Path+name; a ^)Mx9  
 BITMAPFILEHEADER bfh; "]_|c\98  
 bfh.bfReserved1=bfh.bfReserved2=0; |O4A+S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); J.<%E[ z  
 bfh.bfSize=54+size; MW`a>'0t?  
 bfh.bfOffBits=54; 7 $9fGo  
 CFile bf; "}OFwes  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ q5vs;,_ |  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); /2@%:b)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 0X0D8H(7Q  
  bf.WriteHuge(lpData,size); ?Nh%!2n  
  bf.Close(); =` i 7?  
  nCount++; 'o7PIhD"  
 } phc1AN=[E  
 GlobalFreePtr(lpData); f0D Ch]  
 if(nCount==1) $k`8Zx w  
  m_Number.Format("%d picture captured.",nCount); @^` <iTK&p  
 else T?\CAk>  
  m_Number.Format("%d pictures captured.",nCount); @zJI0_Bp  
  UpdateData(FALSE); p_z"Uwp  
} 'd t}i<  
iO!lG  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) W1@;94Sb~  
{ lTB!yF.r|  
 if(pMsg -> message == WM_KEYDOWN) kH&ZPAI  
 { vR)7qX}  
  if(pMsg -> wParam == VK_ESCAPE) vfv5ex(  
   return TRUE; Un/fP1  
  if(pMsg -> wParam == VK_RETURN) _#gsR"FZ$  
   return TRUE; NZTYT\7  
 } ltrSTH,kL  
 return CDialog::PreTranslateMessage(pMsg); t3GK{X  
} o(``7A@7a  
$0*47+f  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $dnHUBB  
{ {6n \532@  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ A$F;fCV*  
  SaveBmp(); ^97ZH)Ww  
  return FALSE; _#4,&bh8  
} ,\M_q">npc  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ w3w*"M  
 CMenu pop; gr?pvf!I  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); @ RI^wZ-;  
 CMenu*pMenu=pop.GetSubMenu(0); 'sF563kE  
 pMenu->SetDefaultItem(ID_EXITICON); d>`(.qvxR  
 CPoint pt; SNU bY6  
 GetCursorPos(&pt); AY;+Ws  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); v 2GhR*  
 if(id==ID_EXITICON) O<h#|g1  
  DeleteIcon(); ;iORfUjxrq  
 else if(id==ID_EXIT) +lT]s#Fif  
  OnCancel(); w Y. g- 3  
 return FALSE; (RmED\.]4  
} .V3Dql@z"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); l1)pr{A  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Qyjuzfmz  
 AddIcon(); 'U"3'jh  
 return res; Gx!RaZ1  
} 9-Qtj49  
8@aS9 th$  
void CCaptureDlg::AddIcon() ,&?q}M  
{ 2jZ}VCzRG  
 NOTIFYICONDATA data; WHZng QmY  
 data.cbSize=sizeof(NOTIFYICONDATA); qE72(#:R*  
 CString tip; +7/*y}.U  
 tip.LoadString(IDS_ICONTIP); W{+0iAYnp  
 data.hIcon=GetIcon(0); 4)iEj  
 data.hWnd=GetSafeHwnd(); 02^(z6K'&?  
 strcpy(data.szTip,tip); H27Oq8  
 data.uCallbackMessage=IDM_SHELL; #=H}6!18  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )Zf}V0!?+  
 data.uID=98; g yQ9Z}  
 Shell_NotifyIcon(NIM_ADD,&data); ,A!e"=HF  
 ShowWindow(SW_HIDE); uHro%UAd  
 bTray=TRUE; >.hGoT!_k  
} 3t8H?B12ow  
1ysLZ;K  
void CCaptureDlg::DeleteIcon() JGDUCb~  
{ =Xjuz:9D~  
 NOTIFYICONDATA data; r)5\3j[P  
 data.cbSize=sizeof(NOTIFYICONDATA); A]?O& m |  
 data.hWnd=GetSafeHwnd(); c;rp@_ULG?  
 data.uID=98; U\8#Qvghf  
 Shell_NotifyIcon(NIM_DELETE,&data); j'*p  
 ShowWindow(SW_SHOW); x\hn;i<  
 SetForegroundWindow(); !J=;Z9  
 ShowWindow(SW_SHOWNORMAL); WQLL[{mhS  
 bTray=FALSE; TJ[jZuT:  
} 0*;9CH=BE  
8*#][ wC2  
void CCaptureDlg::OnChange() ]az} n(B,  
{ ,L{o, qzC  
 RegisterHotkey(); b#;N!VX  
} \Tf{ui  
UeQ9G  
BOOL CCaptureDlg::RegisterHotkey() fd"~[ z[  
{ sR>;h /  
 UpdateData(); 4`-?r%$,:  
 UCHAR mask=0; 31sgf5 s  
 UCHAR key=0; C$RAJ  
 if(m_bControl) lZA>L, \d  
  mask|=4; ]<;i} n| <  
 if(m_bAlt) K aQq[a  
  mask|=2; `?o1cf A  
 if(m_bShift) 4fu\3A&  
  mask|=1; 0"<;You  
  key=Key_Table[m_Key.GetCurSel()]; ~R?dDL  
 if(bRegistered){ D@(M+u9/%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); g. Caapy  
  bRegistered=FALSE; FX|lhwmc(  
 } t6%xit+  
 cMask=mask; d+m6-4[_k  
 cKey=key; ,Z*3,/a  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >_0 i=.\  
 return bRegistered; }M9DqZ;I  
} &Rl3y\ r  
&X]=Q pl  
  四、小结 G\:psx/  
}u3H4S<o  
  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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