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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: dUI5,3*  
  kB\{1;  
  一、实现方法 _X6'u J  
&p0e)o~Ux  
  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: &d#R'Z  
8.E"[QktZ  
#pragma data_seg("shareddata") gYpMwC{*d  
HHOOK hHook =NULL; //钩子句柄 Ui{%q @  
UINT nHookCount =0; //挂接的程序数目 v3tJtb^'!  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 f:T?oR>2  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 % RSZ.  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey <n"BPXF~  
static int KeyCount =0; sp9gz~Kq  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 J=4>zQLW  
#pragma data_seg() bz>X~   
 {_rfhz  
  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。 $6hPTc<C  
=YO ]m<  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 5j%G7.S\  
6 SSDc/  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \l%xuT  
cKey,UCHAR cMask) ny={OhP-  
{ ~E<2gMKjO  
 BOOL bAdded=FALSE; d:H'[l.F%  
 for(int index=0;index<MAX_KEY;index++){ *{o7G  a  
  if(hCallWnd[index]==0){ GK(CuwJe  
   hCallWnd[index]=hWnd; F MfpjuHk  
   HotKey[index]=cKey; H=t"qEp  
   HotKeyMask[index]=cMask; ]S|FK>U[  
   bAdded=TRUE; niVR!l  
   KeyCount++; !xM5 A[f  
   break; KWTV!Wxb=K  
  } eRauyL"Q+  
 } @NHh- &;w  
 return bAdded; <=uYfi3,  
} D28`?B9 (  
//删除热键 8% @| /  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OMGggg  
{ G=dzP}B'WA  
 BOOL bRemoved=FALSE; 5En6f`nR{  
 for(int index=0;index<MAX_KEY;index++){ #el27"QP0  
  if(hCallWnd[index]==hWnd){ NE995;  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ iyskADS  
    hCallWnd[index]=NULL; s?SspuV  
    HotKey[index]=0; x3@-E  
    HotKeyMask[index]=0; oFY!NMq}:  
    bRemoved=TRUE; ON?Y Df  
    KeyCount--; D$>_W,*V  
    break; ,pNx(a  
   } 5pO|^G j1  
  } X1L@ G  
 } K %^n.  
 return bRemoved; Rx%S<i;9  
} ^5mc$~1`  
L9x-90'q,  
v gN!9  
  DLL中的钩子函数如下: !>UlvT-  
{Gxe%gu6K  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7  ,Rg~L  
{ :Pud%}'  
 BOOL bProcessed=FALSE; )?n'ZhsX  
 if(HC_ACTION==nCode) "Fz.# U  
 { "gM^o  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 >rnVT K  
   switch(wParam) Z$oy;j99y  
   {  h}bfZL  
    case VK_MENU: n*4`Tduu^  
     MaskBits&=~ALTBIT; "LyD  
     break;  cby#  
    case VK_CONTROL: i`,FXF)  
     MaskBits&=~CTRLBIT;  ;C]Ufk  
     break; h}b:-a  
    case VK_SHIFT: xNz(LZ.c  
     MaskBits&=~SHIFTBIT; #-hO\ QdC  
     break;  *kr/,_K  
    default: //judge the key and send message >rG>Bz^Pu  
     break; Io6/Fv>!  
   } f| RmAP;X,  
   for(int index=0;index<MAX_KEY;index++){ {.Tx70kn  
    if(hCallWnd[index]==NULL) ^l &lwSRVt  
     continue; 6( HF)z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [P$Xr6#  
    { UA[`{rf  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DM.lQ0xk  
     bProcessed=TRUE; r8k(L{W  
    } $KHm5*;nd  
   } kmB!NxF>)F  
  } !^J;S%MB:K  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^E&PZA\,;  
   switch(wParam) 8$00\><r  
   { -(VJ,)8t2  
    case VK_MENU: ul{x|R  
     MaskBits|=ALTBIT; mh }M|h5Im  
     break; jW/WG tz  
    case VK_CONTROL: D0. )%  
     MaskBits|=CTRLBIT; %E?Srs}j  
     break; 1/_g36\l$  
    case VK_SHIFT: K!|eN_1A  
     MaskBits|=SHIFTBIT; VK}4 <u  
     break; {>&~kM@  
    default: //judge the key and send message 'r;mm^cS?  
     break; O"m7r ds  
   } igO>)XbsM  
   for(int index=0;index<MAX_KEY;index++){ MDMd$] CW  
    if(hCallWnd[index]==NULL) "gJ?LojB<  
     continue; lH-VqkR\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) )m%uSSx#  
    { %1z;l.c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); {I#_0Q,i  
     bProcessed=TRUE; J~~\0 u  
    } b UG,~\Z  
   } 0RR|!zEu  
  } %L|fTndKH  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 %Ymi,o>  
   for(int index=0;index<MAX_KEY;index++){ HB07 n4 |  
    if(hCallWnd[index]==NULL) =C %)(|  
     continue; bQ< qdGa  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) f@*69a8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;p`1Y<d-O  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 AGhenDN V  
   } )'shpRB;1  
  }  Spm 0`  
 } |}"YUk^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); %"RJi?  
} ]lWqV  
X+vKY  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: I8H3*DE  
LG}{ibB  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); kR]P/4r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); q8 v iC|  
rxCzPF  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: iOL$|Z(  
l{By]S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?d')#WnC  
{ !V|{(>+<  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) (m]l -Re  
 { ["Zvwes#7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 G|i0n   
  SaveBmp(); ~id6^#&>  
  return FALSE; 4,RPidv%O  
 } Z0gtliJ@  
 …… //其它处理及默认处理 ;QI9OcE@/  
} D 0Xl`0"'  
p1N}2]e  
IQqUFP$8g  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 *>fr'jj1$  
*^>"  h@J  
  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。 +VwQ=[y]  
y6(PG:L  
  二、编程步骤 {!,K[QwcI  
E@}F^0c  
  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"; ?Uql 30A  
$5nMD=   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _!xrBdaJ  
IZVP-  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 8ud12^s$  
?sfqg gi  
  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; O&!R7T  
Tigw+2  
  5、 添加代码,编译运行程序。 6St=r)_  
;zCUx*{  
三、程序代码 VcjbRpTy&  
O'4G'H)   
///////////////////////////////////// Hook.h : main header file for the HOOK DLL |)x7qy`  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Ek +R  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ k4+vI1Cs  
#if _MSC_VER > 1000 0U42QEG2  
#pragma once 9a`Lr B  
#endif // _MSC_VER > 1000 RhWQ:l]  
#ifndef __AFXWIN_H__ <q63?Ms'  
#error include 'stdafx.h' before including this file for PCH \gA!)q.;  
#endif ~^wSwd[  
#include "resource.h" // main symbols NuZ2,<~9  
class CHookApp : public CWinApp Dfs^W{YA  
{ =VC18yA  
 public: =Rd`"]Mnfb  
  CHookApp(); U`v2Yw3E  
  // Overrides <Iw{fj|  
  // ClassWizard generated virtual function overrides +pd,gG?dW  
  //{{AFX_VIRTUAL(CHookApp) X[tt'5  
 public: s-p)^B  
  virtual BOOL InitInstance(); '-wmY?ZFxy  
  virtual int ExitInstance(); pcMzLMG<  
  //}}AFX_VIRTUAL !GOaBs  
  //{{AFX_MSG(CHookApp) j~v`q5X  
  // NOTE - the ClassWizard will add and remove member functions here. @SX%q&-  
  // DO NOT EDIT what you see in these blocks of generated code ! Ak[X`e T  
  //}}AFX_MSG ;|Cd q  
  DECLARE_MESSAGE_MAP() s5~k]"{j  
}; c 4z&HQd  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); .*zN@y3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^O|fw?,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); tYA@J["^  
BOOL InitHotkey(); /x3*oO1  
BOOL UnInit(); 161P%sGx2  
#endif , Ckcc  
la[ pA  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. TY8gB!^  
#include "stdafx.h"  _a09;C  
#include "hook.h" n%E,[JT  
#include <windowsx.h> /HIyQW\Ki-  
#ifdef _DEBUG <83Ky;ry  
#define new DEBUG_NEW s|C[{n<_  
#undef THIS_FILE s8-RXEPb  
static char THIS_FILE[] = __FILE__; M0 z%<_<}  
#endif *aErwGLB8  
#define MAX_KEY 100 u(vZOf]jL  
#define CTRLBIT 0x04 r1!1u7dr t  
#define ALTBIT 0x02 ]V"P &; m  
#define SHIFTBIT 0x01 v[L+PD U  
#pragma data_seg("shareddata") a (U52dO,  
HHOOK hHook =NULL; [?K>s>it  
UINT nHookCount =0; I Q_6DF  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ; Y/nS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j!+jLm!l  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey f:Pl Mv!{  
static int KeyCount =0; 8eqTA8$?  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift T Q41i/{  
#pragma data_seg() ElO|6kOBYG  
HINSTANCE hins; ?G`m;S  
void VerifyWindow(); _E '?U  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) CL0 lMZ  
//{{AFX_MSG_MAP(CHookApp) 9NTNulD>P  
// NOTE - the ClassWizard will add and remove mapping macros here. 8LV6E5Q  
// DO NOT EDIT what you see in these blocks of generated code! Ysm RY=3  
//}}AFX_MSG_MAP fcq8aW/z_  
END_MESSAGE_MAP() bPVk5G*ruP  
461g7R%r  
CHookApp::CHookApp() 8 063LWV  
{ ("U<@~  
 // TODO: add construction code here, JrcbJt  
 // Place all significant initialization in InitInstance b1Vr>:sK47  
} { ^o.f  
l~Jd>9DwY  
CHookApp theApp;  X}(s(6  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 4/ ` *mPW  
{ &S4*x|-C&  
 BOOL bProcessed=FALSE; Fk=SkS ky  
 if(HC_ACTION==nCode) ] SJ#:7  
 { 7z? ;z<VJ  
  if((lParam&0xc0000000)==0xc0000000){// Key up |d0ZB_ci  
   switch(wParam) Kx9u|fp5  
   { E2DfG^sGV  
    case VK_MENU: * JK0X  
     MaskBits&=~ALTBIT; ]:e_Y,@  
     break; S]3CRJU3`  
    case VK_CONTROL: ]bds~OY5 U  
     MaskBits&=~CTRLBIT;  l"ms:v  
     break; fkI 5~Y|  
    case VK_SHIFT: \'~ E%=Q  
     MaskBits&=~SHIFTBIT; )tG. 9"<  
     break; Q`F1t  
    default: //judge the key and send message k;\gYb%L  
     break; \2@J^O1,  
   } .wNXvnWr  
   for(int index=0;index<MAX_KEY;index++){ [IAUJ09>I  
    if(hCallWnd[index]==NULL) `cp\UH@  
     continue; +b 6R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9a*#r;R  
    { ^kfqw0!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :k\#=u(  
     bProcessed=TRUE; ULiRuN0 6  
    } K]|UdNo  
   } oU|G74e6  
  } V'9.l6l   
  else if((lParam&0xc000ffff)==1){ //Key down JQ?`l)4  
   switch(wParam) WEwa<%Ss  
   { &tH?m;V  
    case VK_MENU: w_{tS\  
     MaskBits|=ALTBIT; Qvp"gut)%X  
     break; JuO47}i]5  
    case VK_CONTROL: ~,/@]6S&Y  
     MaskBits|=CTRLBIT; ?t YZ/  
     break; :)1"yo\  
    case VK_SHIFT: P<g(i 6]  
     MaskBits|=SHIFTBIT; }{R*pmv$bN  
     break; NQ`D"n  
    default: //judge the key and send message sD3ZZcy|=  
     break; X&9: ^$m  
   } v+LJx    
   for(int index=0;index<MAX_KEY;index++) 9gg{i6  
   { m!7%5=Fc  
    if(hCallWnd[index]==NULL) rZ?:$],U!  
     continue; JpS}X\]i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) JP4DV=}L  
    { 6]v}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ~5,^CTAM  
     bProcessed=TRUE; MZGhN brd  
    } 3}nk9S:jr  
   } 0O"W0s"T#  
  } ,D{7=mDVm  
  if(!bProcessed){ X,Na4~JO(  
   for(int index=0;index<MAX_KEY;index++){ {KgA V  
    if(hCallWnd[index]==NULL) w(@r-2D"  
     continue; @HS*%N"*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) *73gp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); c'2/C5  
   } ujV{AF`JfB  
  } ]s=|+tz\V  
 } ;TL.QN/l  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ,4'gj0  
} LGt>=|=bj  
c`<2&ke  
BOOL InitHotkey() 3y)\dln  
{ 2j+w5KvU  
 if(hHook!=NULL){ ~xd?y*gk;  
  nHookCount++; 9[/0  
  return TRUE; &vrQ *jX  
 } s70Z&3A  
 else wsmgkg  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); +Kk1[fh-  
  if(hHook!=NULL) 8n3]AOc'~-  
   nHookCount++; poBeEpbs  
  return (hHook!=NULL); T >8P1p@A,  
} iTHwH{!  
BOOL UnInit() x)C}  
{ ! VR&HEru  
 if(nHookCount>1){ D1rVgM  
  nHookCount--; `/sNX<mp  
  return TRUE; &D3]O9a0;  
 } &3SS.&g4W  
 BOOL unhooked = UnhookWindowsHookEx(hHook); P3"R2-  
 if(unhooked==TRUE){ * BM|luYL  
  nHookCount=0;  Qxz[  
  hHook=NULL; h  /  
 } LSta]81B4L  
 return unhooked;  w*`:v$  
} z_>~=Mm  
g`pq*D  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) mn@1&#c4y  
{ ZxvH1qx8  
 BOOL bAdded=FALSE; es7;eH*O9  
 for(int index=0;index<MAX_KEY;index++){ 8$NVVw]2,  
  if(hCallWnd[index]==0){ 9d"*Z%!j  
   hCallWnd[index]=hWnd; 5e7YM@ng  
   HotKey[index]=cKey; XO]^+'U}p  
   HotKeyMask[index]=cMask; AQZ<,TE0,  
   bAdded=TRUE; bqbG+ g  
   KeyCount++; ]q"&V\b  
   break; hF$`=hE,F~  
  } 1h@qcom9K_  
 } @JGmOwZ  
 return bAdded; +JErc)%  
} :$D*ab^^P  
ehW[LRtq  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qcs) p  
{ 7 z    
 BOOL bRemoved=FALSE; 8C{&i5kj\E  
 for(int index=0;index<MAX_KEY;index++){ UPH#~D!  
  if(hCallWnd[index]==hWnd){ .,u>WIUxj  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ OQumA j  
    hCallWnd[index]=NULL; 5az%yS  
    HotKey[index]=0; KSs1EmB  
    HotKeyMask[index]=0; rf0Z5.  
    bRemoved=TRUE; <)ZQRE@  
    KeyCount--; |5vcT, A  
    break; <ww D*t  
   } D=ej%]@iw  
  } Mqr]e#"o  
 } F?6kkLS/  
 return bRemoved; EA~xxKq  
} d[t0K]  
1"y !wsM%  
void VerifyWindow() "=a3"/u  
{ d&^b=d FDu  
 for(int i=0;i<MAX_KEY;i++){ P8m0]T.&x  
  if(hCallWnd!=NULL){ e=9/3?El  
   if(!IsWindow(hCallWnd)){ Z 7@'I0;A  
    hCallWnd=NULL; nZioFE}  
    HotKey=0; wNi%u{T  
    HotKeyMask=0; B?%u< F  
    KeyCount--; lfAy$qP"}  
   } ZFLmD|q#{  
  } Iynks,ikA  
 } 2BC!,e$Z  
} qlcd[Y*B  
~DD _n  
BOOL CHookApp::InitInstance() 2mEqfy  
{ C@Wzg  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); I7vP*YE 7F  
 hins=AfxGetInstanceHandle(); 5.^pD9[mT  
 InitHotkey(); w"0$cL3  
 return CWinApp::InitInstance(); k^oSG1F  
} 8sj2@d  
a[hF2/*  
int CHookApp::ExitInstance() q]{gAGe~  
{ r $S9/  
 VerifyWindow(); 2xN7lfu1RB  
 UnInit(); g/C 7wc  
 return CWinApp::ExitInstance(); |&@q$d  
} \>S.nW  
j#f/M3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file OmuE l>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) :P q&l.  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ c^=q(V  
#if _MSC_VER > 1000 8 o}5QOW  
#pragma once k1D7=&i  
#endif // _MSC_VER > 1000 w5z]=dN  
mRx `G(u:v  
class CCaptureDlg : public CDialog b_Y+XXb<  
{ 9SeGkwec?$  
 // Construction (`4&h%g  
 public:  _ %mm  
  BOOL bTray; gp9O%g3'  
  BOOL bRegistered; -}m  
  BOOL RegisterHotkey();  *wJ$U  
  UCHAR cKey; (~G*' /)  
  UCHAR cMask; ai?uJ}  
  void DeleteIcon(); 0c>>:w20D  
  void AddIcon(); qt OuA  
  UINT nCount; OyDoktz$)  
  void SaveBmp(); =-!jm? st*  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor q5g_5^csM{  
  // Dialog Data HZ<#H3_ix  
  //{{AFX_DATA(CCaptureDlg) NATi)A"TZ  
  enum { IDD = IDD_CAPTURE_DIALOG }; :(enaHn#~  
  CComboBox m_Key; W4 q9pHQ  
  BOOL m_bControl; 5tv*uz|fv  
  BOOL m_bAlt; GYw/KT~$  
  BOOL m_bShift; u|23M,  
  CString m_Path; 8!v|`Ky  
  CString m_Number; `x=kb;  
  //}}AFX_DATA tgBA(2/Co  
  // ClassWizard generated virtual function overrides n^QDMyC;I  
  //{{AFX_VIRTUAL(CCaptureDlg) m@nGXl'!  
 public: fyUW;dj  
  virtual BOOL PreTranslateMessage(MSG* pMsg); qF3S\ C  
 protected: gS(JgN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support _$*-?*V&  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 'tTlBf7#  
  //}}AFX_VIRTUAL cV:Q(|QC  
  // Implementation +PYR  
 protected: p3fV w]N  
  HICON m_hIcon; >]}VD "\  
  // Generated message map functions RCqL~7C+ k  
  //{{AFX_MSG(CCaptureDlg) TPb&";4ROf  
  virtual BOOL OnInitDialog(); a?Om;-i2`S  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ip'v<%,Q3"  
  afx_msg void OnPaint(); -T+yS BO_3  
  afx_msg HCURSOR OnQueryDragIcon(); J>dj]1I  
  virtual void OnCancel(); e77s?WxbK  
  afx_msg void OnAbout(); W9cvxsox  
  afx_msg void OnBrowse(); Nj6Np^@sH  
  afx_msg void OnChange(); fx 08>r   
 //}}AFX_MSG L,_U co  
 DECLARE_MESSAGE_MAP() -C^qN7Bz  
}; .~'q yD2V  
#endif >`3 0 ib  
NO*~C',cI/  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _)-2h[  
#include "stdafx.h" &\?{%xj  
#include "Capture.h" N cHCcc  
#include "CaptureDlg.h" J'cE@(US  
#include <windowsx.h> .WOF:Nu4  
#pragma comment(lib,"hook.lib") IwFf8? 3  
#ifdef _DEBUG M-Nn \h$,  
#define new DEBUG_NEW m";8 nm  
#undef THIS_FILE ~l+~MB  
static char THIS_FILE[] = __FILE__; qyyLU@hd  
#endif i_6wD  
#define IDM_SHELL WM_USER+1 M]\"]H?  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); oQyMs>g  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); T5~Qfl?Y  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; #oGvxc7  
class CAboutDlg : public CDialog " 6$+B/5  
{ KJ?/]oLr0  
 public: TuMZHB7h;  
  CAboutDlg(); yyR@kOGga  
  // Dialog Data Zfu" 8fX  
  //{{AFX_DATA(CAboutDlg) K6<1&  
  enum { IDD = IDD_ABOUTBOX }; w*SFQ_6YE  
  //}}AFX_DATA #l2WRw_t  
  // ClassWizard generated virtual function overrides bVRxGn @l  
  //{{AFX_VIRTUAL(CAboutDlg) <.7W:s,f=  
 protected: f2|On6/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support RAyR&p  
  //}}AFX_VIRTUAL Y!E| X 3  
  // Implementation 1?+)T%"  
 protected: Z?",+|4  
  //{{AFX_MSG(CAboutDlg) '.&,.E&{$  
  //}}AFX_MSG y(#F&^|  
  DECLARE_MESSAGE_MAP() hYCyc -W  
}; GLl@ 6S>v  
ZG)C#I1;O  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Jf2:[ Mq  
{ \No22Je6d  
 //{{AFX_DATA_INIT(CAboutDlg) a7NX~9 g  
 //}}AFX_DATA_INIT K3UG6S\B  
} Iq": U  
9aqFdlbY  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~?A,GalS  
{ \t&6$"n(B6  
 CDialog::DoDataExchange(pDX); I|[aa$G  
 //{{AFX_DATA_MAP(CAboutDlg) ?yz}  
 //}}AFX_DATA_MAP xcIZ'V  
} nuv$B >  
28+ Sz>SP  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Z@iMG  
 //{{AFX_MSG_MAP(CAboutDlg) %@M/)"k  
 // No message handlers fs]Zw mA^  
 //}}AFX_MSG_MAP &sA6o"h~  
END_MESSAGE_MAP()  K[TMTn  
&9] [ ~$  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) .J\U|r  
: CDialog(CCaptureDlg::IDD, pParent) M/sqOhg  
{ El&pu x2  
 //{{AFX_DATA_INIT(CCaptureDlg) A[':O*iB  
  m_bControl = FALSE; &<i>)Ss  
  m_bAlt = FALSE; U7fE6&g  
  m_bShift = FALSE; g?o$:>c  
  m_Path = _T("c:\\"); /[#{#:lo2  
  m_Number = _T("0 picture captured."); ;/{Q4X{  
  nCount=0; I0jEhg%JZ  
  bRegistered=FALSE; Iei4yDv ;  
  bTray=FALSE; J&:0ytG  
 //}}AFX_DATA_INIT XWy iS\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 s_h <  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ow`c B  
} ;1OTK6  
O,1u\Zy/  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z06pX$Q.<  
{ SS~Txt75m  
 CDialog::DoDataExchange(pDX); yxQAO_C  
 //{{AFX_DATA_MAP(CCaptureDlg) \&qVr1|  
  DDX_Control(pDX, IDC_KEY, m_Key); ?R{?Qv  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 0_y%Qj^e  
  DDX_Check(pDX, IDC_ALT, m_bAlt); f,a4LF  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); o_*|`E  
  DDX_Text(pDX, IDC_PATH, m_Path); Q}.y"|^  
  DDX_Text(pDX, IDC_NUMBER, m_Number); N$,)vb<  
 //}}AFX_DATA_MAP O-2H!58$)  
} ^9b `;}).  
L,4 ^Of  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) n _ez6{  
//{{AFX_MSG_MAP(CCaptureDlg) GRV9s9^  
 ON_WM_SYSCOMMAND() j1iC1=`ZM  
 ON_WM_PAINT() Q6W)rJ[|  
 ON_WM_QUERYDRAGICON() D3lYy>~d5;  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 80]TKf>  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ];2eIe  
 ON_BN_CLICKED(ID_CHANGE, OnChange) h+^T);h};|  
//}}AFX_MSG_MAP n0i&P9@B1  
END_MESSAGE_MAP() &{=~)>h  
0j/81Y}p  
BOOL CCaptureDlg::OnInitDialog() xNqQbk F  
{ G =4y!y  
 CDialog::OnInitDialog(); Sf'5/9<DW+  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); w+$gY?%  
 ASSERT(IDM_ABOUTBOX < 0xF000); q(p0#Mk,E  
 CMenu* pSysMenu = GetSystemMenu(FALSE); eB@i)w?@o  
 if (pSysMenu != NULL) =K>Z{% i  
 { I2DmM"-|  
  CString strAboutMenu; aC$g(>xFt  
  strAboutMenu.LoadString(IDS_ABOUTBOX); B+DRe 8  
  if (!strAboutMenu.IsEmpty()) \j;uN#)28  
  { cnPX vD^kY  
   pSysMenu->AppendMenu(MF_SEPARATOR); lM1!2d'P  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); R39R$\  
  } 5)o IPHXw  
 } B:r-')!0$#  
 SetIcon(m_hIcon, TRUE); // Set big icon g^4FzJ  
 SetIcon(m_hIcon, FALSE); // Set small icon =U2Te  
 m_Key.SetCurSel(0); .}<B*e=y  
 RegisterHotkey(); "AK3t' jF*  
 CMenu* pMenu=GetSystemMenu(FALSE); jr l6):x  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); l=]vC +mU  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); udZ: OU<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); S7q &|nI  
 return TRUE; // return TRUE unless you set the focus to a control 2!otVz! Mh  
} ">QY'r  
bgK(l d`  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rpT<cCem1  
{ Z%{f[|h9}  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) '> Q$5R1  
 { +=k|(8Js#  
  CAboutDlg dlgAbout; l.W:6", w  
  dlgAbout.DoModal(); oX4uRc7wR  
 } GKtQ>39B  
 else /_a *C.a6  
 { L-R}O 8  
  CDialog::OnSysCommand(nID, lParam); ,6S 8s  
 } Fb' wC  
} u" g p">  
dR+$7N$  
void CCaptureDlg::OnPaint() kZ9pgdI  
{ ,s76]$%4  
 if (IsIconic()) Q8q_w2s,  
 { Pvw%,=41O  
  CPaintDC dc(this); // device context for painting w$ {  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 7dJaWD:&   
  // Center icon in client rectangle B~#@fIL  
  int cxIcon = GetSystemMetrics(SM_CXICON); y)E2=JQA/  
  int cyIcon = GetSystemMetrics(SM_CYICON); ):@%xoF5  
  CRect rect; :GYv9OG  
  GetClientRect(&rect); s- V$N  
  int x = (rect.Width() - cxIcon + 1) / 2; /6c10}f  
  int y = (rect.Height() - cyIcon + 1) / 2; lp UtNy  
  // Draw the icon P.B'Gh#^  
  dc.DrawIcon(x, y, m_hIcon); ]c2| m}I{:  
 } OJ 5 !+#>  
 else mD)O\.uA  
 { 2AW{qwk7  
  CDialog::OnPaint(); q_&IZ,{Vk  
 } *~uuCLv_  
} ZRm\d3x4  
3p W MS&  
HCURSOR CCaptureDlg::OnQueryDragIcon() AZy2Pu56  
{ []0~9,u  
 return (HCURSOR) m_hIcon; :a@z53X@M  
} $SVGpEw  
2oG|l!C  
void CCaptureDlg::OnCancel() " G6j UTt  
{ 8w[EyVHA  
 if(bTray) |=T<WU1$  
  DeleteIcon(); }z+"3A|  
  CDialog::OnCancel(); [1^wy#  
} odf^W  
,P@-DDJ  
void CCaptureDlg::OnAbout() *$C[![   
{ yWtr,  
 CAboutDlg dlg; u(Sz$eV  
 dlg.DoModal(); )>5k'1  
} u/c3omY"#  
X2YOD2<v  
void CCaptureDlg::OnBrowse() )"uG*}\?b  
{ <,4(3 >js  
 CString str; veg!mY2&  
 BROWSEINFO bi; /$,=>  
 char name[MAX_PATH]; Z<<gz[$+p  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); f {Z%:H  
 bi.hwndOwner=GetSafeHwnd();  ja- ~`  
 bi.pszDisplayName=name; i%4k5[f.:  
 bi.lpszTitle="Select folder"; -z$2pXT ^  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; HbfB[%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); a BH1J]_  
 if(idl==NULL) B!ibE<7,  
  return; jY+S,lD  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); yKEFne8^  
 str.ReleaseBuffer(); ,D2_Z]  
 m_Path=str; gCr|e}w-  
 if(str.GetAt(str.GetLength()-1)!='\\') L_K\i?  
  m_Path+="\\"; lY*]&8/=  
 UpdateData(FALSE); O:tX0<6  
} /.YAFH|i)"  
:yjK*"T|OD  
void CCaptureDlg::SaveBmp() ZCFf@2&z8  
{ eSNSnh]'  
 CDC dc; xcvr D  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); '#PqI)P  
 CBitmap bm; :;;WK~* #  
 int Width=GetSystemMetrics(SM_CXSCREEN); X/K)kIi  
 int Height=GetSystemMetrics(SM_CYSCREEN); RLOQ>vYY  
 bm.CreateCompatibleBitmap(&dc,Width,Height); yUmsE-W  
 CDC tdc; etMh=/NFV  
 tdc.CreateCompatibleDC(&dc); 2qMsa>~  
 CBitmap*pOld=tdc.SelectObject(&bm); Z WRRh^  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bH&)rn  
 tdc.SelectObject(pOld); bTQa'y`3  
 BITMAP btm; g+ 1=5g  
 bm.GetBitmap(&btm); /:{_|P\  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; D>b5Uwt  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); <-B"|u  
 BITMAPINFOHEADER bih; ]Bd3d%  
 bih.biBitCount=btm.bmBitsPixel; |EV\a[  
 bih.biClrImportant=0; !FO^:V<|5  
 bih.biClrUsed=0; #lshN,CPm  
 bih.biCompression=0; 6mpg&'>  
 bih.biHeight=btm.bmHeight; oXlxPN39  
 bih.biPlanes=1; _ c ]3nzIr  
 bih.biSize=sizeof(BITMAPINFOHEADER); 66@3$P%1p  
 bih.biSizeImage=size; K}E7|gdG  
 bih.biWidth=btm.bmWidth; h<' 5q&y  
 bih.biXPelsPerMeter=0; .n& Cq+U;  
 bih.biYPelsPerMeter=0; u@_!mjXQ  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); t_>bTcsU  
 static int filecount=0; dEd]U49u  
 CString name; B5,QJ W*  
 name.Format("pict%04d.bmp",filecount++); k)usUP'  
 name=m_Path+name; koEX4q  
 BITMAPFILEHEADER bfh; UcLNMn|  
 bfh.bfReserved1=bfh.bfReserved2=0; VMZ]n%XRXW  
 bfh.bfType=((WORD)('M'<< 8)|'B'); vo6[2.HS  
 bfh.bfSize=54+size; .d~]e2x  
 bfh.bfOffBits=54; V l~Y  
 CFile bf; C7 ]DJn  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ d9-mWz(V+  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); '*N9"C  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); l P$r   
  bf.WriteHuge(lpData,size); u@Cf*VPK  
  bf.Close(); 2@R8P~^W  
  nCount++; fQW_YQsb  
 } IFrb}yH  
 GlobalFreePtr(lpData); GtM( Y  
 if(nCount==1) 7}'A)C>J;  
  m_Number.Format("%d picture captured.",nCount); od}EM_  
 else vf'cx:m  
  m_Number.Format("%d pictures captured.",nCount); OVUs]uK  
  UpdateData(FALSE); Xm8Z+}i  
} I51oG:6fR?  
J(EaE2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) X(y  
{ A!ioji+{[  
 if(pMsg -> message == WM_KEYDOWN) {;iH Yr-zs  
 { /}nrF4S  
  if(pMsg -> wParam == VK_ESCAPE) _D>as\dP  
   return TRUE; 88#qu.  
  if(pMsg -> wParam == VK_RETURN) hk@`N;dn  
   return TRUE; B]|6`UfB  
 } vNz;#Je  
 return CDialog::PreTranslateMessage(pMsg); ,zN3? /7  
} Ac[|MBaF  
S"P9Nf?9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;;YcuzQI3  
{ oF;%^XFp  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ HCJ8@nki  
  SaveBmp(); 9'n))%CZ.  
  return FALSE; xi?P(s A  
} Z\|u9DO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ h eE'S/  
 CMenu pop; WjY{rM,K  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); vr{'FMc  
 CMenu*pMenu=pop.GetSubMenu(0); 5>ADw3z'  
 pMenu->SetDefaultItem(ID_EXITICON); 0Oc}rRH(C  
 CPoint pt; >lraYMc<rZ  
 GetCursorPos(&pt); ` y^zM/Ib  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); H ~[LJ5x  
 if(id==ID_EXITICON) `!nJS|  
  DeleteIcon(); 9U|<q  
 else if(id==ID_EXIT) y8w0eq94  
  OnCancel(); msc 1^2  
 return FALSE; OB?SkR  
} kRN|TDx(  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); : F7k{~  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) }z%OnP  
 AddIcon(); selP=Q!  
 return res; rb:<N%*t  
} 1KTabj/C  
GSz @rDGY  
void CCaptureDlg::AddIcon() ]~ !X iCqu  
{ *?_qE  
 NOTIFYICONDATA data; `E} p77  
 data.cbSize=sizeof(NOTIFYICONDATA); <$jKy3@  
 CString tip; ; .ysCF  
 tip.LoadString(IDS_ICONTIP); Pgn_9Y?<  
 data.hIcon=GetIcon(0); x?,~TC4  
 data.hWnd=GetSafeHwnd(); =5y`(0 I`U  
 strcpy(data.szTip,tip); B*?ZE4`  
 data.uCallbackMessage=IDM_SHELL; Hva2j<h  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; &l. x:eD  
 data.uID=98; 5-8]N>/b!  
 Shell_NotifyIcon(NIM_ADD,&data); ^oQekga\l  
 ShowWindow(SW_HIDE); Dq/3E-y5  
 bTray=TRUE; 8W~lU~-  
} O9t=lrYV!  
N@Xg5huO  
void CCaptureDlg::DeleteIcon() DeOXM=&z  
{ '8 )Wd"[  
 NOTIFYICONDATA data; 9?uqQ  
 data.cbSize=sizeof(NOTIFYICONDATA); :O9P(X*  
 data.hWnd=GetSafeHwnd(); Mn]}s:v  
 data.uID=98; G*i.a*9<)  
 Shell_NotifyIcon(NIM_DELETE,&data); ?SC3Vzr  
 ShowWindow(SW_SHOW); uu}a:qrY  
 SetForegroundWindow(); 0jR){G9+  
 ShowWindow(SW_SHOWNORMAL); T>#TDMU#Fm  
 bTray=FALSE; w$gS j/  
} paW'R+Rck  
N0=-7wMk(Z  
void CCaptureDlg::OnChange() CE~r4  
{ f%2%T'Q  
 RegisterHotkey(); hzaLx8L  
} f;.SSiT  
zzX<?6MS  
BOOL CCaptureDlg::RegisterHotkey() \Y*!f|=of  
{ 9c#lLKrzG  
 UpdateData(); RK?jtb=&A  
 UCHAR mask=0; xN6?yr  
 UCHAR key=0; It%T7 X#  
 if(m_bControl) o;3j:# 3 |  
  mask|=4; za,6 du6  
 if(m_bAlt) fC_zX}3  
  mask|=2; #hIEEkCp +  
 if(m_bShift) &oA~ Tx  
  mask|=1; k_]\(myq  
  key=Key_Table[m_Key.GetCurSel()]; cX2$kIs;  
 if(bRegistered){ __ 8&Jv\  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); KzV.+f  
  bRegistered=FALSE; FyCBN tCv  
 } e\`wlaP,  
 cMask=mask; z~F37]W3[  
 cKey=key; {3_Gjb5\\4  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); }A-{6Qe  
 return bRegistered; f[x~)=  
} V {p*z  
x@h tx?   
  四、小结 J;S-+  
(FuEd11R  
  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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