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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: UmI@":|-  
  3SB7)8Id1  
  一、实现方法 Fe2 -;o  
d?qO`- ~$  
  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: $Qc%9p @i  
:tDGNz*zG  
#pragma data_seg("shareddata") XxU}|jTO#  
HHOOK hHook =NULL; //钩子句柄   SrU   
UINT nHookCount =0; //挂接的程序数目 *CD=cmdD*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 h|>n3-k|p  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ]{,=mOk  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey u H;^>`DT  
static int KeyCount =0; $gtT5{"PN(  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 KUn5S&eB  
#pragma data_seg() Hx/Vm`pRyX  
g_!xO2LH,8  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 `2U/O .rV  
!-o||rt  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: G,* uj0g  
K<9MK>T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 0`Qs=R`OM  
cKey,UCHAR cMask) +fR`@HI  
{ J3JRWy@?P  
 BOOL bAdded=FALSE; iQj{J1V  
 for(int index=0;index<MAX_KEY;index++){ E|}Nj}(*  
  if(hCallWnd[index]==0){ rG%_O$_dO  
   hCallWnd[index]=hWnd; SmEd'YD!J  
   HotKey[index]=cKey; p q5H{  
   HotKeyMask[index]=cMask; G8c}re   
   bAdded=TRUE; }pZnWK+  
   KeyCount++; NOr*+N\  
   break; -Z& {$J  
  } 2%%U)|39mB  
 } aRKG)0=  
 return bAdded; 1{glRY'  
} ,<WykeC  
//删除热键 lMf5F8  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) cG"<*Xi<  
{ s-DL=MD  
 BOOL bRemoved=FALSE; vK>^#b3  
 for(int index=0;index<MAX_KEY;index++){ ] :#IZ0#  
  if(hCallWnd[index]==hWnd){ Mj;'vm7#'  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ G7{:d  
    hCallWnd[index]=NULL; ?S7:KnU>K  
    HotKey[index]=0; <NsT[r~C  
    HotKeyMask[index]=0; Nfvg[c  
    bRemoved=TRUE; 6$;)CO!h  
    KeyCount--; KD*4n'm!>  
    break; r?>Hg+  
   } {v'Fg  
  } /[T8/7;_l  
 } TBp5xz`  
 return bRemoved; Hx0,kOh)  
} 4T^WRS  
R63d `W  
nvs7s0@Fqe  
  DLL中的钩子函数如下: Q9V4-MC9  
wi >ta  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 74OM tLL$  
{ |hyr(7  
 BOOL bProcessed=FALSE;  ?wY.B  
 if(HC_ACTION==nCode) &y?B&4|hM  
 { ~q>ilnL"h  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 $KFWV2P  
   switch(wParam) }7v2GfEkM  
   {  ,DZLEsFM  
    case VK_MENU: #nhAW  
     MaskBits&=~ALTBIT; =Z$6+^L  
     break; bV,R*C  
    case VK_CONTROL: #pFybk  
     MaskBits&=~CTRLBIT; \2b9A' d>  
     break; Ut=y`]F  
    case VK_SHIFT: a{,t@G  
     MaskBits&=~SHIFTBIT; GUX X|W[6  
     break; xFnMXh t  
    default: //judge the key and send message Yl=  |P`  
     break; y}`%I&]n  
   } !7DS  
   for(int index=0;index<MAX_KEY;index++){  S_6;e|  
    if(hCallWnd[index]==NULL) _ji%BwJ  
     continue; \ed(<e>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) NQD b;5:  
    { n-_w0Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jm"xf7  
     bProcessed=TRUE; pn|{P<b\  
    } g5[3[Z(.  
   } vt,X:3  
  } iiscm\  
  else if((lParam&0xc000ffff)==1){ //有键按下 DdgFBO  
   switch(wParam) p(>'4#|qy  
   { KS_d5NvYl  
    case VK_MENU: DK1)9<  
     MaskBits|=ALTBIT; }OFk.6{{&v  
     break; CcQ|0  
    case VK_CONTROL: hSH-Ck@Qy  
     MaskBits|=CTRLBIT; ,-Gw#!0  
     break; L|?tcic  
    case VK_SHIFT: x.RZ!V-  
     MaskBits|=SHIFTBIT; yAe}O#dy  
     break; C5z4%,`f  
    default: //judge the key and send message i/Z5/(zF  
     break; 70~]J8T+u  
   } na)_8r~  
   for(int index=0;index<MAX_KEY;index++){ m|[ Hhw=f  
    if(hCallWnd[index]==NULL) |/$#G0X;H  
     continue; d8po`J#nb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZW"J]"A  
    { $mlcaH  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ImVe 71mh  
     bProcessed=TRUE; ^;d;b<  
    } |99eDgK,  
   } M\3!elp2z  
  } G1|:b-C  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ^ z;pP  
   for(int index=0;index<MAX_KEY;index++){ .v{ty  
    if(hCallWnd[index]==NULL) "mA/:8`Q  
     continue; _QY "#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) +W`~bX+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8:MYeE5  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 Q@R8qc=*  
   } "+AD+D  
  } J2rH<Fd[up  
 } c 9@*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); {Bx\Z0+'&  
} hSmM OS{  
A6VkVJZx  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: >e%Po,Fg$  
^.Q),{%Xo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Aj_}B.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); aUV>O`|_  
ux=@"!PJ  
  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: S{ !hpq~o  
:gXj( $  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) R.@GLx_zpQ  
{ hS  Sq=(S  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) w]}v m-  
 { u CXd% CzE  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 :>=,sLfJ  
  SaveBmp(); ?zEgN!\R)  
  return FALSE; cQjJ9o7  
 } 23PSv8;EM  
 …… //其它处理及默认处理 _" n4SXhq  
} |Cm}%sgR\0  
4p]Y`];U  
%{Gqhb=u\  
  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。 5"+* c@L  
i~4Kek6,I  
  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。 S1."2AxO  
!?96P|G  
  二、编程步骤 @47TDCr  
ETtR*5Y 5  
  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"; XB?!V|bno  
U w)1yzX  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ^VQiq7 xm  
*T3"U|0_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; {221@ zcCq  
"F^EfpcJ{9  
  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; S $Wd}2>  
.s+e hZ  
  5、 添加代码,编译运行程序。 Ur@3_F  
=o {`vv  
三、程序代码 j>U.(K  
C/XOI >  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL pT <H&  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ${?Px c{-  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ S9.jc@#.`  
#if _MSC_VER > 1000 7W*OyH^  
#pragma once ,xiRP$hGhh  
#endif // _MSC_VER > 1000 wFe</U-';  
#ifndef __AFXWIN_H__ W\Gg!XsLk  
#error include 'stdafx.h' before including this file for PCH N4Ym[l  
#endif eWFlJ;=  
#include "resource.h" // main symbols Rj8l]m6U9  
class CHookApp : public CWinApp tC;D4i  
{ =J:~AD#  
 public: Cs$g]&a  
  CHookApp(); t6tqv  
  // Overrides #(7OvW+y  
  // ClassWizard generated virtual function overrides ]b[ 3 th*  
  //{{AFX_VIRTUAL(CHookApp) /a,q4tD@  
 public: ,Vogo5~X  
  virtual BOOL InitInstance(); P++gR@  
  virtual int ExitInstance(); :F_U^pyG  
  //}}AFX_VIRTUAL te`4*t  
  //{{AFX_MSG(CHookApp) OSBE5  
  // NOTE - the ClassWizard will add and remove member functions here. hk~ s1"  
  // DO NOT EDIT what you see in these blocks of generated code ! {*: C$"L  
  //}}AFX_MSG uaS?y1:c  
  DECLARE_MESSAGE_MAP() V{8mx70  
}; V/03m3!q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (Lc%G~{  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); i}Y:o}  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _C##U;e!  
BOOL InitHotkey(); ?HW*qD#k  
BOOL UnInit(); @+xQj.jNC  
#endif H;v*/~zl  
{5,CW  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 5EU3BVu&u  
#include "stdafx.h" B%,0zb+-L  
#include "hook.h" jWm<!< ~  
#include <windowsx.h> 4|~o<t8  
#ifdef _DEBUG (|WqOwmoUt  
#define new DEBUG_NEW J[^-k!9M  
#undef THIS_FILE vnKUD|  
static char THIS_FILE[] = __FILE__; !$O +M#  
#endif 5!wa\)wY  
#define MAX_KEY 100 m$U2|5un&  
#define CTRLBIT 0x04 y+c+/L8  
#define ALTBIT 0x02 +UB. M  
#define SHIFTBIT 0x01 KjhOz%Yt[o  
#pragma data_seg("shareddata") S-im o  
HHOOK hHook =NULL; T3bBc  
UINT nHookCount =0; I!{5*~ 3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey kw!! 5U;7  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT V%"aU}   
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey }^=J]  
static int KeyCount =0; (*#S%4(YX  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 0Rj_l:d=  
#pragma data_seg() 3t8VH`!mL{  
HINSTANCE hins; lLnD%*03  
void VerifyWindow(); i`X/d=  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ZM\Z2L]n  
//{{AFX_MSG_MAP(CHookApp) WzF/wzR  
// NOTE - the ClassWizard will add and remove mapping macros here. iZ&CE5+  
// DO NOT EDIT what you see in these blocks of generated code! $[H3O(B0*  
//}}AFX_MSG_MAP +"Ka #Z  
END_MESSAGE_MAP() |TkO'QN  
|A"zxNeS"  
CHookApp::CHookApp() xw`Pq6  
{ "wdC/  
 // TODO: add construction code here, 6<gh:vj  
 // Place all significant initialization in InitInstance zh7NXTzyf  
} aK 'BC>uFI  
v&|o5om  
CHookApp theApp; /op8]y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) E<0Y;tR  
{ SDZ/rC!C  
 BOOL bProcessed=FALSE; j2V^1  
 if(HC_ACTION==nCode) WxFVbtw  
 { PKmr5FB  
  if((lParam&0xc0000000)==0xc0000000){// Key up mkgDg y  
   switch(wParam) 6?r}bs6Msx  
   { G/b $cO}  
    case VK_MENU: h(ZZ7(ue  
     MaskBits&=~ALTBIT; m$ "B=b2  
     break; g%Eb{~v  
    case VK_CONTROL: 0ZTT^2R  
     MaskBits&=~CTRLBIT; $)6y:t"  
     break; I t",WFE.  
    case VK_SHIFT: af.yC[  
     MaskBits&=~SHIFTBIT; !?,rcgi  
     break; 2Lm.;l4YO  
    default: //judge the key and send message ca5Ir<mL  
     break; L2+~I<|>  
   } /alJN`g  
   for(int index=0;index<MAX_KEY;index++){ i ,ga2{GnM  
    if(hCallWnd[index]==NULL) Ub3^Js!b%  
     continue;  `i;f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <8~bb- U$  
    { .O@T#0&=_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); DYx3 NDX7  
     bProcessed=TRUE; zW8rC!  
    } &Yb!j  
   } cJ=0zEv  
  } ^i:%0"[*^i  
  else if((lParam&0xc000ffff)==1){ //Key down 4YMX;W  
   switch(wParam) T@Mrbravc  
   { T'!7jgk{:  
    case VK_MENU: >We4F2?  
     MaskBits|=ALTBIT; 22$M6Qof]n  
     break; JYc;6p$<i  
    case VK_CONTROL: *d b,N'rK  
     MaskBits|=CTRLBIT; },+ &y^  
     break; o!bV;]  
    case VK_SHIFT: NSI$uS6  
     MaskBits|=SHIFTBIT; H[S[ y  
     break; U4M}E h8  
    default: //judge the key and send message ir !/{IQx  
     break; p?PK8GL  
   } vnc- W3N  
   for(int index=0;index<MAX_KEY;index++) b1\.hi  
   { F!ZE4S_  
    if(hCallWnd[index]==NULL) ^ZuwUuuf  
     continue; ebfT%_N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 05hjC  
    { LD/NMb  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lub_2Cb|j  
     bProcessed=TRUE; Q #IlUo  
    } ip8%9fG\>  
   } fRh}n ^X  
  } ZD~ra7  
  if(!bProcessed){ {9B"'65o  
   for(int index=0;index<MAX_KEY;index++){ :8=7)cW  
    if(hCallWnd[index]==NULL) gjFpM.D-.  
     continue; 0i[v,eS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) y!eT>4Oyg  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ;8m)a  
   } *!NxtB!LC  
  } TMJq-u51  
 } W-D{ cU  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); gv\WI4"n  
} ur\<NApT;  
m55|&Ux|  
BOOL InitHotkey() mSeCXCrZlI  
{ l]R=I2t  
 if(hHook!=NULL){ +adwEYRrr  
  nHookCount++; FNlS)Bs  
  return TRUE; '-X[T}  
 } Q-<h)WTA  
 else 6pP:Q_U$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); p?-qlPl  
  if(hHook!=NULL) vj%3v4  
   nHookCount++; 'Y2ImSWj  
  return (hHook!=NULL); z;wOtKl5r  
} N2 4J!L  
BOOL UnInit() n,D&pl9f  
{ g^I?u$&E  
 if(nHookCount>1){ hU'h78bt(  
  nHookCount--; Xrl# DN  
  return TRUE; L0.F }~S  
 } {;5\#VFg  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Ahk q  
 if(unhooked==TRUE){ Ua%;hI)j$  
  nHookCount=0; -kzp >=  
  hHook=NULL; }i._&x`):  
 } _$+BYK@  
 return unhooked;  gx9=L&=d  
} ij5|P4Eka  
Nnx dO0X  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) B_mT[)ut  
{ *[Im].  
 BOOL bAdded=FALSE; rHiBW!  
 for(int index=0;index<MAX_KEY;index++){ F/ o }5H  
  if(hCallWnd[index]==0){ ?[?;%Y  
   hCallWnd[index]=hWnd; ;vG%[f`K  
   HotKey[index]=cKey; 7y4jk  
   HotKeyMask[index]=cMask; \&/V p`  
   bAdded=TRUE; X6<Ds'I  
   KeyCount++; T].Xx`  
   break; zb3,2D+P  
  } i"#pk"@`  
 } Yz)+UF,  
 return bAdded; 4OeH}@a  
} v` h n9O  
%/oeV;D  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Cz|F%>y#  
{ NK\0X5##.  
 BOOL bRemoved=FALSE; K2{6{X=  
 for(int index=0;index<MAX_KEY;index++){ &yRR!1n)H  
  if(hCallWnd[index]==hWnd){ ?U+nR/H:6  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DGbEQiX$\  
    hCallWnd[index]=NULL; _9yW; i-  
    HotKey[index]=0; 2q4-9vu  
    HotKeyMask[index]=0; >N~orSw%  
    bRemoved=TRUE; s~06%QEG  
    KeyCount--; `{%ImXQF  
    break; &G!~@\tMg  
   } #(}'G*  
  } 'i <%kL@  
 } &'k:?@J[  
 return bRemoved; ,Cd4Q7T  
} O1Ynl` }  
}Gva=N:  
void VerifyWindow() +#L'g c  
{ 8.HJoos  
 for(int i=0;i<MAX_KEY;i++){ J@A^k1B  
  if(hCallWnd!=NULL){ Qe =8x7oIP  
   if(!IsWindow(hCallWnd)){ Y0yu,   
    hCallWnd=NULL; ~p?D[]h  
    HotKey=0; 3S .2  
    HotKeyMask=0; @ 3rJ$6W  
    KeyCount--; 3"Zc|Ck <?  
   } h t3P@;  
  } =6a=`3r!I  
 } G/ H>M%M  
} b ,x$wP+  
b#-=Dbe  
BOOL CHookApp::InitInstance() ?)gc;K  
{ iUbcvF3aP  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); iD.p KG  
 hins=AfxGetInstanceHandle(); cx[[K.  
 InitHotkey(); i0u`J  
 return CWinApp::InitInstance(); RdB,;Um9f  
} fI,2l   
tn;Uaw  
int CHookApp::ExitInstance() %GP`H/H(  
{ !?" pnKb}  
 VerifyWindow(); [e>2HIS,  
 UnInit(); Ap~6Vu  
 return CWinApp::ExitInstance(); 9* P-k.Bl  
} WDI3*  
FqZD'Uu7  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file v6H!.0  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) XMzQ8|]  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ P{HR='2  
#if _MSC_VER > 1000 JkI|Ojmm/  
#pragma once hcpe~spz9|  
#endif // _MSC_VER > 1000 .pG`/[*a  
558!?kx$  
class CCaptureDlg : public CDialog Wo  Z@  
{ 5S[:;o  
 // Construction x \I uM  
 public: 5&.I9}[)j  
  BOOL bTray; cSjX/%*!m  
  BOOL bRegistered; xt6%[)  
  BOOL RegisterHotkey(); 3L-$+j~u  
  UCHAR cKey; 'Z|Czd8E  
  UCHAR cMask; ^ U);MH8  
  void DeleteIcon(); Tv `&  
  void AddIcon(); .e4upT GU  
  UINT nCount; +i[@+`  
  void SaveBmp(); v|dt[>G  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor b'I@TLE')  
  // Dialog Data 3lbGG42:  
  //{{AFX_DATA(CCaptureDlg) <E:_9#Z0sc  
  enum { IDD = IDD_CAPTURE_DIALOG }; 7X8*7'.2  
  CComboBox m_Key; #7"";"{ z|  
  BOOL m_bControl; J\FLIw4  
  BOOL m_bAlt; oBs5xH7@-  
  BOOL m_bShift; G^Y^)pc]   
  CString m_Path; )LsUO#%DO  
  CString m_Number; *to#ZMR;!  
  //}}AFX_DATA ['Qh#^p  
  // ClassWizard generated virtual function overrides If8Lt}-  
  //{{AFX_VIRTUAL(CCaptureDlg) ]z]=?;ty%  
 public: \TLfLqA  
  virtual BOOL PreTranslateMessage(MSG* pMsg); t>Yl= 79,  
 protected: ;X:Bh8tEV  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8K@e8p( y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Md0`/F:+2  
  //}}AFX_VIRTUAL 3[@:I^q  
  // Implementation m {&lU@uL  
 protected: h*Mt{A&'.&  
  HICON m_hIcon; N'PK4:  
  // Generated message map functions ~Lq`a@]A  
  //{{AFX_MSG(CCaptureDlg) YV'B*arIA  
  virtual BOOL OnInitDialog(); Esm=sPW  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); b~{nS,_Rn  
  afx_msg void OnPaint(); :UX8^+bfZ  
  afx_msg HCURSOR OnQueryDragIcon(); -c{Y+M`  
  virtual void OnCancel(); '$VP\Gj.  
  afx_msg void OnAbout(); [+ : zlA  
  afx_msg void OnBrowse(); t. HwX9  
  afx_msg void OnChange(); HdyE`FY\  
 //}}AFX_MSG  C~^T=IP  
 DECLARE_MESSAGE_MAP() 2Ima15^+F  
}; nGsFt.  
#endif JE#H&]  
^F- 2tc  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file '@zMZc!  
#include "stdafx.h" <tm=  
#include "Capture.h" >;#rK@*&  
#include "CaptureDlg.h" Y5P9z{X=  
#include <windowsx.h> ERIF#EY  
#pragma comment(lib,"hook.lib") Js.G hTs  
#ifdef _DEBUG +HjSU2  
#define new DEBUG_NEW Zad>i w}  
#undef THIS_FILE S_^;#=_c  
static char THIS_FILE[] = __FILE__; =iB$4d2  
#endif ;Zc0imYL  
#define IDM_SHELL WM_USER+1 qxcTY|&  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); N8,g~?r^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); "Z~@"JLb%  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I}|E_U1Qj  
class CAboutDlg : public CDialog 9ph>4u(R  
{ (4IP&^j:\  
 public: ;kZJnN"y  
  CAboutDlg(); Q(R -8"  
  // Dialog Data ?X\uzu  
  //{{AFX_DATA(CAboutDlg) n]nJ$u1u  
  enum { IDD = IDD_ABOUTBOX }; )TBm?VMe  
  //}}AFX_DATA =`2jnvx  
  // ClassWizard generated virtual function overrides !| q19$  
  //{{AFX_VIRTUAL(CAboutDlg) r oBb o  
 protected: } Fli  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support s#aane  
  //}}AFX_VIRTUAL xgtx5tg  
  // Implementation ~S<}q6H.  
 protected: _,? xc"  
  //{{AFX_MSG(CAboutDlg) 5g;mc.Cvt  
  //}}AFX_MSG I0;gTpt9  
  DECLARE_MESSAGE_MAP() zm_8{Rta}  
}; ZkdSgc')  
>.H}(!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ^)'D eP/  
{ 4F<wa s/  
 //{{AFX_DATA_INIT(CAboutDlg) ScQ9p379  
 //}}AFX_DATA_INIT 9j}Q~v\  
} Q=Q&\.<  
jw/@]f;N  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) m63>P4h?  
{ hpq\  
 CDialog::DoDataExchange(pDX); Bsk` e  
 //{{AFX_DATA_MAP(CAboutDlg) h A '>  
 //}}AFX_DATA_MAP oW>e.}d!  
} dnM.  
uH7!)LE#  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Dc 84^>l  
 //{{AFX_MSG_MAP(CAboutDlg) P,7R/-u5D  
 // No message handlers jF(R;?,  
 //}}AFX_MSG_MAP FTzc,6  
END_MESSAGE_MAP() 6KE64: \;  
|O'gT8  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) yNG|YB;  
: CDialog(CCaptureDlg::IDD, pParent) 5 o[E8c 8  
{ Zeq^dV5y77  
 //{{AFX_DATA_INIT(CCaptureDlg) \Hq=_}]F  
  m_bControl = FALSE; A'D2uV  
  m_bAlt = FALSE; @wVDe\% ,  
  m_bShift = FALSE; Q91mCP~$  
  m_Path = _T("c:\\"); .eCUvX`$  
  m_Number = _T("0 picture captured."); 9niffq)h  
  nCount=0; tiR i_  
  bRegistered=FALSE; J/rF4=j%xy  
  bTray=FALSE; <"S`ZOn  
 //}}AFX_DATA_INIT 31F^38  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 61sEeM  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); B"`86qc  
} d6zq,x!cI  
%][zn$aa|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9U@>&3[v  
{ <W^>:!?w  
 CDialog::DoDataExchange(pDX); T:!H^  
 //{{AFX_DATA_MAP(CCaptureDlg) sdKm@p|/|  
  DDX_Control(pDX, IDC_KEY, m_Key); [vnxp/v/<  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |-%dN }O  
  DDX_Check(pDX, IDC_ALT, m_bAlt); yb\!4ml  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); II\}84U2 .  
  DDX_Text(pDX, IDC_PATH, m_Path); ?9T,sX:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); R[#B|$  
 //}}AFX_DATA_MAP R$">  
} KB{/L5  
A>)W6|m|  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) oJc7a z  
//{{AFX_MSG_MAP(CCaptureDlg) rT;_"y}  
 ON_WM_SYSCOMMAND()  ,0i72J  
 ON_WM_PAINT() MB6lKLy6~  
 ON_WM_QUERYDRAGICON() nFefDdP  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) @-ir  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) Q.V+s   
 ON_BN_CLICKED(ID_CHANGE, OnChange) l\u5RMS('  
//}}AFX_MSG_MAP 3'7X[{uBr  
END_MESSAGE_MAP() n0uL^{B  
VT;cz6"6b4  
BOOL CCaptureDlg::OnInitDialog() _z#S8Y  
{ mhNgXp)_56  
 CDialog::OnInitDialog(); y#nyH0U  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Nig)!4CG  
 ASSERT(IDM_ABOUTBOX < 0xF000); < [17&F0  
 CMenu* pSysMenu = GetSystemMenu(FALSE); !3"Hn  
 if (pSysMenu != NULL) ("=B,%F_  
 { A8ClkLC;I  
  CString strAboutMenu; #-PUm0|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); g{hbq[>X]  
  if (!strAboutMenu.IsEmpty()) D&6.> wt .  
  { #*  8^ar<  
   pSysMenu->AppendMenu(MF_SEPARATOR); kcP&''  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); .|y{1?f_  
  } /f>I;z1  
 } ;v ~xL!uQ  
 SetIcon(m_hIcon, TRUE); // Set big icon Fl\kt.G  
 SetIcon(m_hIcon, FALSE); // Set small icon Ujvk*~:  
 m_Key.SetCurSel(0); !A+jX7Nb  
 RegisterHotkey(); uzT>|uu$  
 CMenu* pMenu=GetSystemMenu(FALSE); Mu_'C$zA  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); bGi k~  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .0dx@Sbv  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Wf&i{3z[  
 return TRUE; // return TRUE unless you set the focus to a control Fn;Gq-^7@  
} W)`H(J  
jVSU]LU E  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h~#.s*0.F  
{ Hc\oR(L  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) irn }.e  
 { -)e(Qt#ewl  
  CAboutDlg dlgAbout; 0}\8,U  
  dlgAbout.DoModal(); k[1w] l8  
 } {dvsZJj  
 else "ZG2olOqLI  
 { [t]q#+Zs  
  CDialog::OnSysCommand(nID, lParam); n%{oFTLCo  
 } Z}>+!Z  
} )2b bG4:N  
>UV=k :Q  
void CCaptureDlg::OnPaint() wR9gx-bE 4  
{ 0fa8.g#I$  
 if (IsIconic()) vARZwIu^D  
 { :]`JcJ  
  CPaintDC dc(this); // device context for painting ho6,&Bp8  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); k-$J #  
  // Center icon in client rectangle c`#4}$  
  int cxIcon = GetSystemMetrics(SM_CXICON); ZC&4uNUr  
  int cyIcon = GetSystemMetrics(SM_CYICON); ,"T[#A~  
  CRect rect; ^C{?LH/2  
  GetClientRect(&rect); nyPW6VQ0n  
  int x = (rect.Width() - cxIcon + 1) / 2; W\z<p P  
  int y = (rect.Height() - cyIcon + 1) / 2; uJJP<mDgA  
  // Draw the icon DjiWg(X  
  dc.DrawIcon(x, y, m_hIcon); =fI0q7]ndz  
 } bE"J&;|  
 else 5pq9x4&  
 { 7zu3o  
  CDialog::OnPaint(); O9:J ^g  
 } 1 <wolTf  
} liTAV9<  
R)9FXz$).  
HCURSOR CCaptureDlg::OnQueryDragIcon() > V@,K z1  
{ w%kaM=  
 return (HCURSOR) m_hIcon; ~tqNxlA  
} dkOERVRe  
PjU.4aZ  
void CCaptureDlg::OnCancel() o6S`7uwJ*/  
{ kk/vgte-)e  
 if(bTray) cqb]LC  
  DeleteIcon(); BWsD~Ft  
  CDialog::OnCancel(); bpfSe  
} @C5 %`{\  
4,ewp coC%  
void CCaptureDlg::OnAbout() s;:quM  
{ 4?~Ei[KgQn  
 CAboutDlg dlg; xf8.PqVNo  
 dlg.DoModal(); 9q"G g?  
} h>"Z=y  
cP8@'l@!  
void CCaptureDlg::OnBrowse() Ijs=4f  
{ Nv\<>gA:  
 CString str; GoG_4:^#h  
 BROWSEINFO bi; $I90KQB\_  
 char name[MAX_PATH]; f2{qj5 K  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #pX+~ {  
 bi.hwndOwner=GetSafeHwnd(); z';h5GNd>z  
 bi.pszDisplayName=name; $ dHD  
 bi.lpszTitle="Select folder"; w7_2JS  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; )"y]_}  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); +F6R@@rWr  
 if(idl==NULL) A*3R@G*h  
  return; 8hvh xp  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X[o"9O|<  
 str.ReleaseBuffer(); ps=QVX)YP  
 m_Path=str; g?!;04  
 if(str.GetAt(str.GetLength()-1)!='\\') 7R".$ p  
  m_Path+="\\"; C,3yu,'  
 UpdateData(FALSE); u9dL-Nr`  
} 8\8%FSrc  
w7h=vy n?  
void CCaptureDlg::SaveBmp() kA&ul  
{ c#(&\g2H  
 CDC dc; rD U"l{cg  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); WFFpW{  
 CBitmap bm; ~uu~NTz  
 int Width=GetSystemMetrics(SM_CXSCREEN); WWWfQ_u2  
 int Height=GetSystemMetrics(SM_CYSCREEN); F84?Mi{r2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); , MU9p*  
 CDC tdc; $6\W8v  
 tdc.CreateCompatibleDC(&dc); Jl,\^)DSw  
 CBitmap*pOld=tdc.SelectObject(&bm); ] mvVX31T  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); iMOf];O)  
 tdc.SelectObject(pOld); TZk.h8  
 BITMAP btm; fT_swh IO  
 bm.GetBitmap(&btm); Q mn'G4#@E  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; E{6X-C[)v  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); =u]FKY  
 BITMAPINFOHEADER bih; Nh\y@\F>  
 bih.biBitCount=btm.bmBitsPixel; t8FgQ)tk  
 bih.biClrImportant=0; MFLw^10(T  
 bih.biClrUsed=0; w'Q2Czso  
 bih.biCompression=0; u+uu?.bM  
 bih.biHeight=btm.bmHeight; auQfWO[ u  
 bih.biPlanes=1; vW4N[ .+  
 bih.biSize=sizeof(BITMAPINFOHEADER); \Rvsy;7  
 bih.biSizeImage=size; Bn{0-5nj  
 bih.biWidth=btm.bmWidth; ?GKm_b]JC  
 bih.biXPelsPerMeter=0; L\UM12  
 bih.biYPelsPerMeter=0; <x2 F5$@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gb/M@6/j  
 static int filecount=0; &:)e   
 CString name; x+5y287#  
 name.Format("pict%04d.bmp",filecount++); T89VSB~  
 name=m_Path+name; f7QX"p&P  
 BITMAPFILEHEADER bfh; SvGs?nUU  
 bfh.bfReserved1=bfh.bfReserved2=0; s *1%I$=@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); E|Z7art  
 bfh.bfSize=54+size; ._z[T@!9  
 bfh.bfOffBits=54; pvJPMx  
 CFile bf; \ g[A{  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 6WnGP>tc.  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7 }sj&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 6KI< J*Wz`  
  bf.WriteHuge(lpData,size); m =2e1wc  
  bf.Close(); 8?7:sfc  
  nCount++; mF !=H%  
 } 7'xds  
 GlobalFreePtr(lpData); %S<( z5  
 if(nCount==1) v mXY}Ul  
  m_Number.Format("%d picture captured.",nCount); }ZWeb#\  
 else .U !;fJ9  
  m_Number.Format("%d pictures captured.",nCount); >h m<$3  
  UpdateData(FALSE); #i GRi!$h  
} i@ avm7  
[0G>=h@u  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) kY6))9 O  
{ +iPS=?S  
 if(pMsg -> message == WM_KEYDOWN) D0&{iZ(  
 { LvNk:99:<  
  if(pMsg -> wParam == VK_ESCAPE) Ma3Hn  
   return TRUE; jTx,5s-  
  if(pMsg -> wParam == VK_RETURN) qqYH}%0dz  
   return TRUE; ynN[N(m#  
 } <!vAqqljt  
 return CDialog::PreTranslateMessage(pMsg); ]X)EO49  
} *7I=vro  
s"?&`S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) YtrMJ"  
{ d0 tN73(  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $*H>n!&  
  SaveBmp(); J)n g,i  
  return FALSE; STmCj  
} \0pJ+@\T9  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ;D[b25  
 CMenu pop; mYk5f_}  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4>^ %_Xj[  
 CMenu*pMenu=pop.GetSubMenu(0); 2g^Kf,m  
 pMenu->SetDefaultItem(ID_EXITICON); E}qeh"sJt  
 CPoint pt; hGF(E*  
 GetCursorPos(&pt); viBf" .  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 2Xgw7` !L  
 if(id==ID_EXITICON) D] 2+<;>`>  
  DeleteIcon(); 0nz k?iP  
 else if(id==ID_EXIT) Q_#X*I  
  OnCancel(); 3Pp*ID  
 return FALSE; E4[\lX$J  
} ? F f w'O  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); $/45*  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) !{SU G+.2  
 AddIcon(); @11voD  
 return res; ?kb\%pcK  
} r/L3j0  
DRV vW6s  
void CCaptureDlg::AddIcon() v4|kiy  
{ N1(}3O  
 NOTIFYICONDATA data; SJ7>*Sa(u$  
 data.cbSize=sizeof(NOTIFYICONDATA); j &Ayk*  
 CString tip; u6jJf@!ws  
 tip.LoadString(IDS_ICONTIP); (s{%XB:K  
 data.hIcon=GetIcon(0); Af0E_  
 data.hWnd=GetSafeHwnd(); 0tB9X9:,  
 strcpy(data.szTip,tip); Zk}e?Grc  
 data.uCallbackMessage=IDM_SHELL; ?#D@e5Wf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Z#;ieI\  
 data.uID=98; e= "/oo  
 Shell_NotifyIcon(NIM_ADD,&data); =W !m`  
 ShowWindow(SW_HIDE); lLtC9:  
 bTray=TRUE; ^O\tN\g;c  
} \{+7`4g  
m$hSL4 N  
void CCaptureDlg::DeleteIcon() O,JthlAV4  
{ g)&-S3\  
 NOTIFYICONDATA data; uD:O[H-x  
 data.cbSize=sizeof(NOTIFYICONDATA); r:Cad0xj;^  
 data.hWnd=GetSafeHwnd(); Q:VD 2<2  
 data.uID=98; `U`Z9q5-  
 Shell_NotifyIcon(NIM_DELETE,&data); 9LJ/m\bi  
 ShowWindow(SW_SHOW); nhXa&Nro  
 SetForegroundWindow(); 3[aJ=5  
 ShowWindow(SW_SHOWNORMAL); G';oM;~/|  
 bTray=FALSE; eB$v'9S8/  
} ~w[zX4@  
",8h>eEWK  
void CCaptureDlg::OnChange() ;{Z2i%  
{ A7_*zR @  
 RegisterHotkey(); ,%nmCetD@  
} n7<<}wcV  
L1C' V/g  
BOOL CCaptureDlg::RegisterHotkey() /'VCJjzZ  
{ ocgbBE  
 UpdateData(); ~T4 =Id  
 UCHAR mask=0; Z/x<U.B  
 UCHAR key=0; *bRH,u  
 if(m_bControl) o~>p=5t  
  mask|=4; <J H0 &  
 if(m_bAlt) "l +Jx|h\  
  mask|=2; @1Zf&'/6  
 if(m_bShift) 'T|.<u@~  
  mask|=1; QTn-n)AE  
  key=Key_Table[m_Key.GetCurSel()]; KI>7h.t  
 if(bRegistered){ sCRBKCR?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); oHi&Z$#!n  
  bRegistered=FALSE; `(o1&  
 } dnIBAe  
 cMask=mask; X?7$JV-:  
 cKey=key; U;V. +onv  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [sKdIw_  
 return bRegistered; (vj2XiO^+  
} zLh ~x  
(c[h,>`@:  
  四、小结 *.nqQhW  
^*{ xTB57  
  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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