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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: 4/cUd=>Z  
  |%Pd*yZA  
  一、实现方法 %qNT<>c  
y$'(/iyz  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: ApR>b%  
*{ 6{ZKM  
#pragma data_seg("shareddata") Kx7s d i  
HHOOK hHook =NULL; //钩子句柄 DYx3 NDX7  
UINT nHookCount =0; //挂接的程序数目 it \3-  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 wMr*D['" #  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ve<D[jQsk  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey rjz$~(&m6  
static int KeyCount =0; }Dp/K4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 | <gYzb q  
#pragma data_seg() 741Sd8  
M] 7#  
  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。 /GRkQ",  
WTbq)D(&[_  
  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: E&9BeU a#  
az/NZlJhT  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR HW"@~-\  
cKey,UCHAR cMask) 22$M6Qof]n  
{ "&W80,O3  
 BOOL bAdded=FALSE; {W,&jC  
 for(int index=0;index<MAX_KEY;index++){ kIrb;bZ+l  
  if(hCallWnd[index]==0){ ].w~FUa  
   hCallWnd[index]=hWnd; h8'`g 0  
   HotKey[index]=cKey; bL-+  
   HotKeyMask[index]=cMask; dD ?ZF6  
   bAdded=TRUE; b*(74>XY  
   KeyCount++; E+)3n[G  
   break; ;LD!eWSK,  
  } 5o2w)<d!  
 } 4d-f 6iiFV  
 return bAdded; B:;$5PUTc  
} NCL!|  
//删除热键 '*lVVeSiFw  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)  >cw%ckE  
{ ,v,#f .  
 BOOL bRemoved=FALSE; Qh3BI?GZ'3  
 for(int index=0;index<MAX_KEY;index++){ }LeizbU  
  if(hCallWnd[index]==hWnd){ u0p[ltJ,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Ce_k&[AJF  
    hCallWnd[index]=NULL; qjDt6B^RO  
    HotKey[index]=0; KDxqz$14 -  
    HotKeyMask[index]=0; -c4g;;%  
    bRemoved=TRUE; mBN+c9n/  
    KeyCount--; :J6 xYy$  
    break; $ra q,SP  
   } %^Zu^uu   
  } S\io5|P  
 } RqB 8g  
 return bRemoved; 4 ))ZBq?  
} A*^aBWFR  
JCFiKt9n  
Dk%+|c  
  DLL中的钩子函数如下: }l"pxp1K  
P8[rp   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Sq:,6bcG  
{ 6--t6>5  
 BOOL bProcessed=FALSE; \w#)uYK{i_  
 if(HC_ACTION==nCode) +adwEYRrr  
 { FNlS)Bs  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 4M*Z1  
   switch(wParam) ?*LVn~y  
   {  ~ kwS`  
    case VK_MENU: q<[m(]:  
     MaskBits&=~ALTBIT; _59f.FsVR  
     break; ANWfRtiU#  
    case VK_CONTROL: z>]P_E~`}  
     MaskBits&=~CTRLBIT; nEHmiG  
     break; ;-kC&GZf  
    case VK_SHIFT: R`KlG/Tk  
     MaskBits&=~SHIFTBIT; ` {/"?s|  
     break; ?mwa6]  
    default: //judge the key and send message Y#[xX2z9  
     break; D,\hRQ  
   }  T_)G5a  
   for(int index=0;index<MAX_KEY;index++){ *(E]]8o  
    if(hCallWnd[index]==NULL) )sN}ClgJ  
     continue; }i._&x`):  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) _$+BYK@  
    { &8\6%C  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); `NySTd)\  
     bProcessed=TRUE; #?"^:,Y  
    } OMf w#  
   } ,J(shc_F  
  } Y6G`p  
  else if((lParam&0xc000ffff)==1){ //有键按下 3!M|Sf<s  
   switch(wParam) 'C7$,H'  
   { 70 -nAv  
    case VK_MENU: hh!4DHv   
     MaskBits|=ALTBIT; <c%  
     break; <P~pn!F}  
    case VK_CONTROL: vN&(__3((  
     MaskBits|=CTRLBIT; ;oCSKY4  
     break; 4OeH}@a  
    case VK_SHIFT: v` h n9O  
     MaskBits|=SHIFTBIT; [>D5(O  
     break; |"g+p)A  
    default: //judge the key and send message IN_O!c0e  
     break; Z H2   
   } }2h!  
   for(int index=0;index<MAX_KEY;index++){ XM f>B|  
    if(hCallWnd[index]==NULL) LEuDDJ -  
     continue; x3:d/>b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) dWTc3@xd  
    { xc}kDpF=g  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); >N~orSw%  
     bProcessed=TRUE; s~06%QEG  
    } `{%ImXQF  
   } j-#h^3l1?  
  } BD- c<K"  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Dy&{PeE!  
   for(int index=0;index<MAX_KEY;index++){ 5[LDG/{Tys  
    if(hCallWnd[index]==NULL) /Z~5bb(  
     continue; LNcoTdv}k  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) =%SH2kb  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {4{X`$  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 vM?,#:5  
   } <ivq}(%72  
  } _Un*x5u2O  
 } ?f= ~Pn+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CC)Mws+2  
} VpX*l3  
j^.|^q<Y  
  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: :28[k~.bo  
f}EsS  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RK/>5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Vkf c&+  
OP|X-  
  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: b ,x$wP+  
b#-=Dbe  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?)gc;K  
{ / hg)=p  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r{{5@  
 { .P#t"oW}  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 + B<7]\\M  
  SaveBmp(); _ h/:r1  
  return FALSE; xb2j |KY7  
 } .qLX jU  
 …… //其它处理及默认处理 Bk] `n'W  
} ^HU>fkSk  
CF6qEG6  
:Wihb#TO)  
  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%I c  
MoXai0d%  
  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。 U8{^-#(Uz  
_hgGF9  
  二、编程步骤 ydMhb367|  
f\FqZ?w  
  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"; 0v#p4@Z  
/IlO   
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _FU}IfG>t  
mA#;6?6  
  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; MP_/eC ;  
XZ2 ji_D  
  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; w\M"9T  
fZ(k"*\MZ  
  5、 添加代码,编译运行程序。 XP[~ :+  
r?9".H  
三、程序代码 3e>U(ES  
e~SRGyIww  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL r)B55;*Fh  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) v|dt[>G  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ b'I@TLE')  
#if _MSC_VER > 1000 3lbGG42:  
#pragma once <E:_9#Z0sc  
#endif // _MSC_VER > 1000 7X8*7'.2  
#ifndef __AFXWIN_H__ #7"";"{ z|  
#error include 'stdafx.h' before including this file for PCH J\FLIw4  
#endif dGUiMix{N  
#include "resource.h" // main symbols WHqw=! G  
class CHookApp : public CWinApp ps^["3e  
{ *uSlp_;kB  
 public: ZENblh8fs  
  CHookApp(); +Ht(_+To1  
  // Overrides T+PERz(  
  // ClassWizard generated virtual function overrides ~>Y^?l  
  //{{AFX_VIRTUAL(CHookApp) Q3'P<"u  
 public: q;#bFPh  
  virtual BOOL InitInstance(); -v:3#9uX)  
  virtual int ExitInstance(); ,kUg"\_k  
  //}}AFX_VIRTUAL ,4k3C#!. i  
  //{{AFX_MSG(CHookApp) @vL0gzE?nB  
  // NOTE - the ClassWizard will add and remove member functions here. y4VO\N!  
  // DO NOT EDIT what you see in these blocks of generated code ! !hE F.S  
  //}}AFX_MSG $KBW{  
  DECLARE_MESSAGE_MAP() `<#O8,7`  
};  N!Xn)J  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); "([lkn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 3m~,6mQ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); >|0 I\{ C  
BOOL InitHotkey(); 1ed^{Wa4$9  
BOOL UnInit(); {suQ"iv  
#endif t. HwX9  
HdyE`FY\  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ]bbP_n8  
#include "stdafx.h" 3NdO3-~)  
#include "hook.h" ti3S'K0t  
#include <windowsx.h> }S4+1 U3  
#ifdef _DEBUG %L$ ?Mey  
#define new DEBUG_NEW i ~)V>x  
#undef THIS_FILE 4pZKm-dM^  
static char THIS_FILE[] = __FILE__; >;#rK@*&  
#endif Y5P9z{X=  
#define MAX_KEY 100 ERIF#EY  
#define CTRLBIT 0x04 WqS$C;]%  
#define ALTBIT 0x02 rCb$^(w{7  
#define SHIFTBIT 0x01 Y/LS(b*  
#pragma data_seg("shareddata") "Bz#5kqnl  
HHOOK hHook =NULL; VA`VDUG,  
UINT nHookCount =0; hu7o J H  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ~jzT;9:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Iu(]i?Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ZXf& pqmG  
static int KeyCount =0; fF2] 7:  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift mRt/ d  
#pragma data_seg() ` +)Bl%*  
HINSTANCE hins; jkAru_C  
void VerifyWindow(); 06`caG|]-M  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) r9<#R=r)}J  
//{{AFX_MSG_MAP(CHookApp) !| q19$  
// NOTE - the ClassWizard will add and remove mapping macros here. r oBb o  
// DO NOT EDIT what you see in these blocks of generated code! mE'HRv  
//}}AFX_MSG_MAP H_ NoW  
END_MESSAGE_MAP() D( y c  
#TV #*  
CHookApp::CHookApp() o=PW)37>  
{ Q'Uv5p"X  
 // TODO: add construction code here, 7UqDPEXU]`  
 // Place all significant initialization in InitInstance 4QYStDFe  
} =L;g:hc<  
7mn&w$MS4:  
CHookApp theApp; sQ&<cBs2  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) )`2ncb   
{ - ^Y\'y2  
 BOOL bProcessed=FALSE; :G=ol2Q  
 if(HC_ACTION==nCode) |oQhtk8.  
 { m 0Uu2Z4  
  if((lParam&0xc0000000)==0xc0000000){// Key up JdUI:(  
   switch(wParam) 9H53H"5q  
   { K M[&WT  
    case VK_MENU: a/rQ@c>  
     MaskBits&=~ALTBIT; +i}uRO  
     break; "*TP@X?@f  
    case VK_CONTROL: dz/3=0  
     MaskBits&=~CTRLBIT; bIzBY+P  
     break; &'/bnN +R  
    case VK_SHIFT: y'<5P~W!a  
     MaskBits&=~SHIFTBIT; P,#l~\  
     break; s!]QG  
    default: //judge the key and send message LG{50sP`  
     break; $O fZp<M  
   } .&Sjazk0XO  
   for(int index=0;index<MAX_KEY;index++){ + (`.pa z@  
    if(hCallWnd[index]==NULL) ^* CKx  
     continue; @wVDe\% ,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) kX*.BZI}C  
    { k9&W0$I#  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); .3>q3sS  
     bProcessed=TRUE; e:.D^G Fi  
    } ]; eJ'#  
   } d" a\`#  
  } !u/c'ZLZ>  
  else if((lParam&0xc000ffff)==1){ //Key down i-4?]h k  
   switch(wParam) CUft  
   { @Y ?p-&  
    case VK_MENU: 5kHU'D  
     MaskBits|=ALTBIT; cnDF`7xrT  
     break; 31F^38  
    case VK_CONTROL: DD6K[\  
     MaskBits|=CTRLBIT; n" vO?8Sx  
     break; 6aWNLJ@  
    case VK_SHIFT: V<U9Pj^?^  
     MaskBits|=SHIFTBIT; q AsTiT6r  
     break; `'9t^ 6mk  
    default: //judge the key and send message 5!57<n  
     break; n:}'f- :T  
   } er@.<Dc  
   for(int index=0;index<MAX_KEY;index++) c'Q.2^w^  
   { $J]NWgXl@  
    if(hCallWnd[index]==NULL) YWDd[\4  
     continue; &x@N5j5Q  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sqj8I"<`  
    { R[#B|$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); R$">  
     bProcessed=TRUE; KB{/L5  
    } n8q%>.i7  
   } Z5*O\kJv  
  } /<J5?H  
  if(!bProcessed){ (m')dSZ  
   for(int index=0;index<MAX_KEY;index++){ #?Ob->v  
    if(hCallWnd[index]==NULL) YdYaLTz  
     continue; qy-Hv6oof  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %4/X;w\3  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); :Z6l)R+V  
   } }!WuJz"  
  } WpkCFp  
 } Hx9lQ8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); @[5]?8\o  
} )X6I #q8  
E< pO!P  
BOOL InitHotkey() ]XWtw21I1  
{ jk])S~xl?  
 if(hHook!=NULL){ ph3dm\U.  
  nHookCount++; qIO)<5\[%d  
  return TRUE; {!pYQ|#  
 } x139Ckn  
 else = d!YM6G  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); C`aUitL}  
  if(hHook!=NULL) OjK+`D_C  
   nHookCount++; R1/mzPG  
  return (hHook!=NULL); yp pZ@  
} vtq47i  
BOOL UnInit() WmblY2  
{ |e2s{J2   
 if(nHookCount>1){ fh&Q(:ZU  
  nHookCount--; !6J+#  
  return TRUE; nd h\+7  
 } pQ`S%]k.<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 't475?bY  
 if(unhooked==TRUE){ I.1(qbPkF+  
  nHookCount=0; @[;$R@M_3  
  hHook=NULL; Eq5X/Hx  
 } 0}\8,U  
 return unhooked; }jL4F$wC  
} ItG|{Bo  
n&E/{o(  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "ZG2olOqLI  
{ [t]q#+Zs  
 BOOL bAdded=FALSE; Jx8DVjy  
 for(int index=0;index<MAX_KEY;index++){ Z}>+!Z  
  if(hCallWnd[index]==0){ )2b bG4:N  
   hCallWnd[index]=hWnd; |YrvY1d!  
   HotKey[index]=cKey; wR9gx-bE 4  
   HotKeyMask[index]=cMask; 0fa8.g#I$  
   bAdded=TRUE; vARZwIu^D  
   KeyCount++; N&W7g#F  
   break; (y2P."  
  } .j`8E^7<  
 } ~0L:c&V  
 return bAdded; 02po;  
} 9}11>X  
6/|"y  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) uJJP<mDgA  
{ DjiWg(X  
 BOOL bRemoved=FALSE; =fI0q7]ndz  
 for(int index=0;index<MAX_KEY;index++){ !6*4^$i#o  
  if(hCallWnd[index]==hWnd){ q/3co86c  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?WrL<?r)}U  
    hCallWnd[index]=NULL; :;o?d&C  
    HotKey[index]=0; tsf !Q  
    HotKeyMask[index]=0; a&gf0g;@I  
    bRemoved=TRUE; >soSOJ[   
    KeyCount--; m8&XW2S  
    break; o q cu<]  
   } <}AmzeHr+  
  } OJ}aN>k  
 } mtNB09E(  
 return bRemoved; 62>/0_m5  
} w6'8L s  
o6S`7uwJ*/  
void VerifyWindow() kk/vgte-)e  
{ cqb]LC  
 for(int i=0;i<MAX_KEY;i++){ z9^_5la#  
  if(hCallWnd!=NULL){ l4q7,%G  
   if(!IsWindow(hCallWnd)){ ~#iAW@  
    hCallWnd=NULL; w%f51Ex  
    HotKey=0; ~VJP:Y{[  
    HotKeyMask=0; d6"B_,*b  
    KeyCount--; E>qehs,g  
   } cONfHl{  
  } ` aaT #r  
 } .%mjE'  
} suZ`  
/S%!{;:  
BOOL CHookApp::InitInstance() |r53>,oR<:  
{ 6 ZVD<C:\  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); G I#TMFz3  
 hins=AfxGetInstanceHandle(); ^r~R]stE^  
 InitHotkey(); i<{/r-w=E  
 return CWinApp::InitInstance(); Z/I`XPmk  
} R]_fe4Y0  
hFt~7R  
int CHookApp::ExitInstance() 0"=}d y  
{ x`p3I*_HT5  
 VerifyWindow(); .y~~[QF}8  
 UnInit(); "RsH'`  
 return CWinApp::ExitInstance(); yykyvy  
} 7:&a,nU  
8R.`*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file D{s4Bo-  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3S1`av(tD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ +4Lj}8,  
#if _MSC_VER > 1000 p:8]jD@}%  
#pragma once )1]LoEdm`  
#endif // _MSC_VER > 1000 h3kBNBI )  
=|bW >y  
class CCaptureDlg : public CDialog $a+)v#?,  
{ x8* @<]!  
 // Construction & A@ !g  
 public: m{sch`bP  
  BOOL bTray; =_H)5I_\  
  BOOL bRegistered; .#ATI<t  
  BOOL RegisterHotkey(); .t9zF-jk  
  UCHAR cKey; ak;S Ie  
  UCHAR cMask; .;~K*GC  
  void DeleteIcon(); .ZOyZnr Z  
  void AddIcon(); 6c&OR2HGqO  
  UINT nCount; n0kkUc-`   
  void SaveBmp(); g3,F+  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor .Dg'MM BM  
  // Dialog Data x$tzq+N  
  //{{AFX_DATA(CCaptureDlg) g].hL  
  enum { IDD = IDD_CAPTURE_DIALOG }; _yVF+\kQ  
  CComboBox m_Key; 78<QNl Kn  
  BOOL m_bControl; &0S/]E`_M  
  BOOL m_bAlt; -qRO}EF  
  BOOL m_bShift; +)K yG  
  CString m_Path; {v}jV{'^um  
  CString m_Number; EAjo>GLI  
  //}}AFX_DATA jRIm_)  
  // ClassWizard generated virtual function overrides 4WV)&50  
  //{{AFX_VIRTUAL(CCaptureDlg) L\asrdL?=  
 public: hTbot^/  
  virtual BOOL PreTranslateMessage(MSG* pMsg); )d-{#  
 protected: -2Azpeh  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support gedk  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); %epK-q9[  
  //}}AFX_VIRTUAL 9CTvG zkw  
  // Implementation $U/_8^6B0  
 protected:  !#8=tO  
  HICON m_hIcon; 4Vi&Y')f  
  // Generated message map functions A'X, zw^}  
  //{{AFX_MSG(CCaptureDlg) Vl+,OBy  
  virtual BOOL OnInitDialog(); cZXra(AD  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); !4G<&hvb  
  afx_msg void OnPaint(); H=k*;'  
  afx_msg HCURSOR OnQueryDragIcon(); bwAL:  
  virtual void OnCancel(); & A<Pf.Us  
  afx_msg void OnAbout(); ;F<)BEXC<  
  afx_msg void OnBrowse(); h8_~ OX  
  afx_msg void OnChange(); ' ! ls"qo  
 //}}AFX_MSG Aw *:5I[  
 DECLARE_MESSAGE_MAP() k)R>5?_  
}; k|}S K9  
#endif "A?_)=zZ  
~0>{PD$@  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file <=,KP)   
#include "stdafx.h" >h m<$3  
#include "Capture.h" wc'K=;c  
#include "CaptureDlg.h" m=< ;)  
#include <windowsx.h> XL7jUi_4:L  
#pragma comment(lib,"hook.lib") n`hes_{,g  
#ifdef _DEBUG @*c ) s_  
#define new DEBUG_NEW L"6@3  
#undef THIS_FILE kY6))9 O  
static char THIS_FILE[] = __FILE__; -m~[z  
#endif \;A\ vQ[  
#define IDM_SHELL WM_USER+1 D0&{iZ(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z[wk-a+w  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Kv:ih=?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Zb7:qe<UN  
class CAboutDlg : public CDialog a JDu_  
{ RFu]vFff  
 public: c!%:f^7g  
  CAboutDlg(); BDg6Z I<n  
  // Dialog Data o*u A+7n  
  //{{AFX_DATA(CAboutDlg) ,uP1U@Cas  
  enum { IDD = IDD_ABOUTBOX }; AcF;5h  
  //}}AFX_DATA G#4cWn'  
  // ClassWizard generated virtual function overrides `&U ['_%  
  //{{AFX_VIRTUAL(CAboutDlg) gU}?Yy  
 protected: 9bT,=b;  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U)p P^:|  
  //}}AFX_VIRTUAL ?Y~>H 2  
  // Implementation "zO+!h'o  
 protected: |7I.DBjR;  
  //{{AFX_MSG(CAboutDlg) Bv |Z)G%RR  
  //}}AFX_MSG |JL47FR  
  DECLARE_MESSAGE_MAP() Q'^]lVY  
}; -~h2^Oez  
.j4IW 3)  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 5aTyM_x  
{ ~I>B5^3  
 //{{AFX_DATA_INIT(CAboutDlg) U9xFQ=$ 2  
 //}}AFX_DATA_INIT @]HV:7<q  
} JqH2c=}-  
OX4+1@$tk  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) EQ>bwEG  
{ .-N9\GlJ,d  
 CDialog::DoDataExchange(pDX); * #;rp~  
 //{{AFX_DATA_MAP(CAboutDlg) um&e.V)N  
 //}}AFX_DATA_MAP B%9[  
} }h>e=<  
w|PZSOJ  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) xZmKKKd0*  
 //{{AFX_MSG_MAP(CAboutDlg) /BVNJNhz  
 // No message handlers b,G+=&6u  
 //}}AFX_MSG_MAP Bd"7F{H  
END_MESSAGE_MAP() FO}4~_W{  
D@Fa~O$75  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) b\?#O}  
: CDialog(CCaptureDlg::IDD, pParent) 3<msiC P  
{ {R,rc!yF  
 //{{AFX_DATA_INIT(CCaptureDlg) %2oLND}?z  
  m_bControl = FALSE; h{ce+~X  
  m_bAlt = FALSE; M)EUR0>8  
  m_bShift = FALSE; Q ;5'I3w  
  m_Path = _T("c:\\"); k< W]VS3N  
  m_Number = _T("0 picture captured."); K"b vUH  
  nCount=0; tQJ@//C\z  
  bRegistered=FALSE; lLtC9:  
  bTray=FALSE; N &p=4  
 //}}AFX_DATA_INIT Ze Shn  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 VV] {R'  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 4 '9h^C&  
} sS(^7GARa  
=GM!M@~,Ab  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) HA"dw2 |  
{ xYt{=  
 CDialog::DoDataExchange(pDX); a$t [}D2  
 //{{AFX_DATA_MAP(CCaptureDlg) rmQGzQnun  
  DDX_Control(pDX, IDC_KEY, m_Key); /yrR f;}<O  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &[\rnJ?D  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ZVIBmx  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); >o>'@)I?e6  
  DDX_Text(pDX, IDC_PATH, m_Path); o ohf))  
  DDX_Text(pDX, IDC_NUMBER, m_Number); +bf%]   
 //}}AFX_DATA_MAP |klL KX&  
} 6nGDoW#  
rzaEVXbz1  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) web&M!-  
//{{AFX_MSG_MAP(CCaptureDlg) bJB:]vs$  
 ON_WM_SYSCOMMAND() =AcbX_[  
 ON_WM_PAINT() 9fl !CG  
 ON_WM_QUERYDRAGICON() {Y'_QW1:2  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) YN>#zr+~  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ?QVD)JI*k  
 ON_BN_CLICKED(ID_CHANGE, OnChange) Cv$TNkP*  
//}}AFX_MSG_MAP cS ];?tqrA  
END_MESSAGE_MAP() [S</QS!  
<!OP b(g2  
BOOL CCaptureDlg::OnInitDialog() tg8VFH2q.z  
{ 1NOz $fW  
 CDialog::OnInitDialog(); 'OX6e Y5  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); J?%D4AeS]v  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]r"{G*1Q 9  
 CMenu* pSysMenu = GetSystemMenu(FALSE); `8'T*KU  
 if (pSysMenu != NULL) Ha C?,  
 { B~PF<8h5  
  CString strAboutMenu; "F[VqqD  
  strAboutMenu.LoadString(IDS_ABOUTBOX); l1W5pmhK]'  
  if (!strAboutMenu.IsEmpty()) m_Fw ;s/9  
  { dEe/\i'r9  
   pSysMenu->AppendMenu(MF_SEPARATOR); eIqj7UY_  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); bNaJ{Dm$R  
  } 4a2&kIn  
 } KP<J~+_ik  
 SetIcon(m_hIcon, TRUE); // Set big icon @Qc['V)  
 SetIcon(m_hIcon, FALSE); // Set small icon qo. 6T  
 m_Key.SetCurSel(0); p-(Z[G*  
 RegisterHotkey(); /{kyjf[o&*  
 CMenu* pMenu=GetSystemMenu(FALSE); *iC t4J  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  B-&J]H  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Cq(Xa-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); G0]n4"~+?  
 return TRUE; // return TRUE unless you set the focus to a control 10}Zoq|)n  
} hCxL4LrF  
g:o\r (  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) nev*TYY?A  
{ !w)Mm P Xb  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) mML^kgy\N  
 { ZXU e4@qfl  
  CAboutDlg dlgAbout; l E&hw  
  dlgAbout.DoModal(); s*8hN*A/,  
 } vy"Lsr3  
 else ;!~;05^iD  
 { dIpt&nH&$  
  CDialog::OnSysCommand(nID, lParam); 'Vrev8D  
 } /e7'5#v  
} /t9w%Y  
4 ^+hw;  
void CCaptureDlg::OnPaint() ASYUKh,h  
{ vSnb>z1  
 if (IsIconic()) %cm5Z^B1"  
 { a<Ns C1  
  CPaintDC dc(this); // device context for painting .y\HQ^j  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Maa.>2v<  
  // Center icon in client rectangle rL,)Tc|"  
  int cxIcon = GetSystemMetrics(SM_CXICON); YwF6/JA0^  
  int cyIcon = GetSystemMetrics(SM_CYICON); `riv`+J{s  
  CRect rect; @Op8^8$`  
  GetClientRect(&rect); l =_@<p  
  int x = (rect.Width() - cxIcon + 1) / 2; ~.@fk}'R  
  int y = (rect.Height() - cyIcon + 1) / 2; .nSupTyG  
  // Draw the icon i L m1l  
  dc.DrawIcon(x, y, m_hIcon); ]Z84w!z  
 } }DM2#E`_  
 else =:g^_Hy  
 { hx2C<;s4  
  CDialog::OnPaint(); )-QNWN H  
 } ,X$Avdc2  
} 6Ss{+MF|v  
}agl:~C  
HCURSOR CCaptureDlg::OnQueryDragIcon() g-:)} 8d6  
{ 8uGPyH  
 return (HCURSOR) m_hIcon; Ffxk] o&%c  
} qIqk@u  
Y(:OfC?  
void CCaptureDlg::OnCancel() O)5PUyC:H  
{ )R +o8C  
 if(bTray) sTA/2d  
  DeleteIcon(); =3zn Ta }  
  CDialog::OnCancel(); jo(Q`oxm!>  
} :U:7iP:  
z\E "={P&  
void CCaptureDlg::OnAbout() \=@r1[d  
{ RYV6hp)|  
 CAboutDlg dlg; jF3!}*7,  
 dlg.DoModal(); 8x9kF]=  
} )>Q 2G/@  
dq8 /^1P  
void CCaptureDlg::OnBrowse() p;7 4 +q  
{ kR6 t .  
 CString str; v\Wm[Ld  
 BROWSEINFO bi; y[zA [H:  
 char name[MAX_PATH]; 3N bn|_`(  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4y1> !~f  
 bi.hwndOwner=GetSafeHwnd(); 7>zKW?  
 bi.pszDisplayName=name; ?V{k\1A  
 bi.lpszTitle="Select folder"; 9V],X=y~  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; J@GfO\ o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )]%9Tgn  
 if(idl==NULL)  `JE>GZ Y  
  return; #LN I&5  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); \i,cL)HM  
 str.ReleaseBuffer(); NqZRS>60v  
 m_Path=str; $&C(oh$:  
 if(str.GetAt(str.GetLength()-1)!='\\') IP'igX  
  m_Path+="\\"; @gqw]_W  
 UpdateData(FALSE); `es($7}P_W  
} @*DIB+K  
p-pw*wH0  
void CCaptureDlg::SaveBmp() -/-6Td1JY>  
{ // }8HY)>  
 CDC dc; 4v|/+J6G  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); :xw3b)KS  
 CBitmap bm; 7RP_ ^Cr+  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^c\IZ5  
 int Height=GetSystemMetrics(SM_CYSCREEN); ?:?4rIZ<  
 bm.CreateCompatibleBitmap(&dc,Width,Height); @"I#b99  
 CDC tdc; BY0|exW  
 tdc.CreateCompatibleDC(&dc); j&/.[?K  
 CBitmap*pOld=tdc.SelectObject(&bm); f^)uK+:.  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); +2zuIW.  
 tdc.SelectObject(pOld); Ib2@Wi   
 BITMAP btm; KCk?)Qv  
 bm.GetBitmap(&btm); s3M84wz  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; x ct U.)p  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Idlu1g  
 BITMAPINFOHEADER bih; A(n=kx  
 bih.biBitCount=btm.bmBitsPixel; :6u3Mj{  
 bih.biClrImportant=0; e9W7ke E*  
 bih.biClrUsed=0; IMGqJc,7  
 bih.biCompression=0; ~B&*7Q7  
 bih.biHeight=btm.bmHeight; pIu H*4Vz  
 bih.biPlanes=1; uit-Q5@~  
 bih.biSize=sizeof(BITMAPINFOHEADER); UNQRtR/  
 bih.biSizeImage=size; X[Ek'=}  
 bih.biWidth=btm.bmWidth; =4e=wAO(i  
 bih.biXPelsPerMeter=0; p{a]pG+3  
 bih.biYPelsPerMeter=0; Ys$YI{  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); v1C.\fL  
 static int filecount=0; Tq84Fn!HJ>  
 CString name; T'M66kg  
 name.Format("pict%04d.bmp",filecount++); ,GX~s5S8  
 name=m_Path+name; @E}X-r.^f  
 BITMAPFILEHEADER bfh; VK'T[5e  
 bfh.bfReserved1=bfh.bfReserved2=0; nuQ6X5>.=  
 bfh.bfType=((WORD)('M'<< 8)|'B'); $G_Q`w=jM  
 bfh.bfSize=54+size; h_~|O [5|)  
 bfh.bfOffBits=54; R*@[P g*  
 CFile bf; jBv$^L  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 2 1~7{#  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); b%;59^4AjD  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); JYd7@Msfc  
  bf.WriteHuge(lpData,size); b;L>%;  
  bf.Close(); v1r_Z($  
  nCount++; )_v\{N  
 } )@qup _M@  
 GlobalFreePtr(lpData); (a}  
 if(nCount==1) P=^#%7J/l  
  m_Number.Format("%d picture captured.",nCount); QP%kL*=8  
 else m`$>:B  
  m_Number.Format("%d pictures captured.",nCount); V+qJrZ ,i  
  UpdateData(FALSE); g6g$nY@Jm  
} lmQ6X  
#jZ@l3  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {KDgK  
{ KO|pJ3  
 if(pMsg -> message == WM_KEYDOWN) "W@XP+POAY  
 { 0i\',h}9  
  if(pMsg -> wParam == VK_ESCAPE) 8*yo7q&  
   return TRUE; sc8DY!|OYN  
  if(pMsg -> wParam == VK_RETURN) CofH}-  
   return TRUE; ns#~}2"d  
 } 3}4p_}f/[4  
 return CDialog::PreTranslateMessage(pMsg); zq;DIWPIoJ  
} &G/|lv>j  
u<]mv  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) XocsSs  
{ f>r3$WKj  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ rer|k<k;]G  
  SaveBmp(); %X9b=%'+  
  return FALSE; \V^*44+ <!  
} jJVT_8J  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ &$c5~9p\B  
 CMenu pop; 7':f_]  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); h}|6VJ@.  
 CMenu*pMenu=pop.GetSubMenu(0); |qlS6Aln  
 pMenu->SetDefaultItem(ID_EXITICON); 8lOI\-  
 CPoint pt; w,Z" W;|  
 GetCursorPos(&pt); 6<Z*Tvk{C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); PXosFz~  
 if(id==ID_EXITICON) S= -M3fP~  
  DeleteIcon(); V5a?=vK9  
 else if(id==ID_EXIT) 2vc\=  
  OnCancel(); vUYJf99B  
 return FALSE; SFn 3$ rh  
} 8?7kIin  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 3Q"F(uE v^  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a*Ss -y  
 AddIcon(); R zS|dGNQE  
 return res; bar0{!Y"  
} 5g``30:o  
WRD A `  
void CCaptureDlg::AddIcon() [5Fd P0  
{ >?5xDbRj  
 NOTIFYICONDATA data; fw' r.  
 data.cbSize=sizeof(NOTIFYICONDATA); MBB5wj  
 CString tip; r219M)D?  
 tip.LoadString(IDS_ICONTIP); ZBX  
 data.hIcon=GetIcon(0); 0e+W/Tq  
 data.hWnd=GetSafeHwnd(); >5;N64]!)  
 strcpy(data.szTip,tip); Y{Da+  
 data.uCallbackMessage=IDM_SHELL; e&QS#k  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /vjGjb=3U  
 data.uID=98; %bP~wl~  
 Shell_NotifyIcon(NIM_ADD,&data); `c"4PU^  
 ShowWindow(SW_HIDE); k6Ihc?HL  
 bTray=TRUE; gYatsFyL  
} hH%,!tSx  
(*,8KLV_i  
void CCaptureDlg::DeleteIcon() 7DtIVMiK  
{ <%z@  
 NOTIFYICONDATA data; 1E8H%2$ V  
 data.cbSize=sizeof(NOTIFYICONDATA); S _!hsY  
 data.hWnd=GetSafeHwnd(); 99e*]')A%  
 data.uID=98; XFW5AP  
 Shell_NotifyIcon(NIM_DELETE,&data); 4'SaEsA~  
 ShowWindow(SW_SHOW); FY]pv6@  
 SetForegroundWindow(); 5Yi Z-CQ>  
 ShowWindow(SW_SHOWNORMAL); _Vjpw,  
 bTray=FALSE; GQN98Y+h  
} lhqQ CV  
XRa(sXA3  
void CCaptureDlg::OnChange() _(C^[:s  
{ n]+.  
 RegisterHotkey(); ; XG]Q<S\  
} ?6i;)eIOI  
3AURzU  
BOOL CCaptureDlg::RegisterHotkey() {6'*Phw  
{ mD7}t  
 UpdateData(); *z0K%@M  
 UCHAR mask=0; D(Qa>B"1  
 UCHAR key=0; W57&\PXYn  
 if(m_bControl) TPHYz>D]  
  mask|=4; |olNA*4  
 if(m_bAlt) 0p-#f|ET  
  mask|=2; FV A UR  
 if(m_bShift) IX9K.f  
  mask|=1; Z>8eD|m%2  
  key=Key_Table[m_Key.GetCurSel()]; "B#Y-  
 if(bRegistered){ A 4j<\xL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3gpo %  
  bRegistered=FALSE; c45tmul  
 } bGN 54{f  
 cMask=mask; OX+hZ<y  
 cKey=key; 6lsL^]7  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); *>k!hq;j  
 return bRegistered; Q',m{;;  
} EX:{EmaT  
W,3zL.qH"  
  四、小结 o(qEkR:4kd  
c3] C:t+  
  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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