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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: $7bl,~Z  
  GDUOUl&  
  一、实现方法 L&s|<<L  
"2~%-;c  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: a6&+>\o  
E0Neo _7  
#pragma data_seg("shareddata")  !Hp H  
HHOOK hHook =NULL; //钩子句柄 !^EdB}@yS  
UINT nHookCount =0; //挂接的程序数目 bn8`$FA^  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 39+6ZTqx  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 g.re`m|Aj  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey w2/3\3p  
static int KeyCount =0; !33)6*s  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 0Zq jq0O#  
#pragma data_seg() #=* y7w  
Qso"jYl<  
  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。 D ^~G(m;-  
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  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: 1VD8y_tC  
#& 5}  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR u{_jweZ  
cKey,UCHAR cMask) 9gLUM$Kd  
{ h *JzJ0X  
 BOOL bAdded=FALSE; NLLLt  
 for(int index=0;index<MAX_KEY;index++){ O5:2B\B  
  if(hCallWnd[index]==0){ =Hs[peO*  
   hCallWnd[index]=hWnd; }j. [h;C6  
   HotKey[index]=cKey; 6HyndB^  
   HotKeyMask[index]=cMask; ">pt, QV  
   bAdded=TRUE; wC~ra:/?:7  
   KeyCount++; 4tb y N  
   break; _poe{@h!  
  } AM ZWPU  
 } 'l| e}eti>  
 return bAdded; dmkd.aP4  
} &S8Pnb)d  
//删除热键 zAxscD f'  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) g[d.lJ=Q-N  
{ V?*\ISB`}  
 BOOL bRemoved=FALSE; AK brXKx  
 for(int index=0;index<MAX_KEY;index++){ M#PutrH  
  if(hCallWnd[index]==hWnd){ |Qe#[Q7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ V#Px  
    hCallWnd[index]=NULL; q|23l1 PI  
    HotKey[index]=0; 1JIo,7  
    HotKeyMask[index]=0; Z.]=u(=a  
    bRemoved=TRUE; A"`^A brm  
    KeyCount--; |QI FtdU5T  
    break; 3bGJ?hpp  
   } Q0\tK=Z/  
  } d,R  
 } W=9Zl(2C  
 return bRemoved; ]^j'2nJv0  
} Snav)Hb'  
O&Ws*k  
M,ObzgW  
  DLL中的钩子函数如下: covr0N)  
W_##8[r(?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) EM.7,;|N  
{ )TmqE<[  
 BOOL bProcessed=FALSE; !)}3[h0  
 if(HC_ACTION==nCode) Y<vsMf_U  
 { YR{%p Zp  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 jv C.T]<B  
   switch(wParam) .=nx5y z  
   {  ![{>$Q?5  
    case VK_MENU: @vC7j>*4B  
     MaskBits&=~ALTBIT; 45u\v2,C3  
     break; %L\buwjy$  
    case VK_CONTROL: *r&q;ER  
     MaskBits&=~CTRLBIT; },d`<^~  
     break; FHu -';  
    case VK_SHIFT: c~1X/,biA  
     MaskBits&=~SHIFTBIT; nS53mLU)  
     break; !2R<T/9~  
    default: //judge the key and send message n8!qz:z/  
     break; ?ep'R&NV  
   } F>0[v|LG  
   for(int index=0;index<MAX_KEY;index++){ UA{tmIC\  
    if(hCallWnd[index]==NULL) h#o3qY  
     continue; ]7d~,<3R  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) G9/5KW}-  
    { /-.i=o]b  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); &@c?5Ie5  
     bProcessed=TRUE; vtv^l 3  
    } JVoW*uA  
   } $E_9AaX  
  } }[[  
  else if((lParam&0xc000ffff)==1){ //有键按下 vu&%e\gM  
   switch(wParam) Zj*kHjn"  
   { L+c7.l.yT  
    case VK_MENU: I-fjqo3  
     MaskBits|=ALTBIT; RW!_Zz Z  
     break; #9{9T"ed  
    case VK_CONTROL: 9'qU4I  
     MaskBits|=CTRLBIT; `v1Xywg9P  
     break; q\B048~KK  
    case VK_SHIFT: [Ipg",Su;f  
     MaskBits|=SHIFTBIT; [BH^SvE  
     break; jWg7RuN  
    default: //judge the key and send message ~4YLPMGKl  
     break; {EoRY/]  
   } #q06K2  
   for(int index=0;index<MAX_KEY;index++){ ;Jn"^zT  
    if(hCallWnd[index]==NULL) 7# /c7   
     continue; jL|y4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?HP54G<{xz  
    { &?],uHB?d  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); $/*6tsR  
     bProcessed=TRUE; Tr^Egw]  
    } T[z]~MJL  
   } nTJ-1A7EP  
  } 3 e19l!B  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 \WDL?(G<  
   for(int index=0;index<MAX_KEY;index++){ nPW?DbH +  
    if(hCallWnd[index]==NULL) eYER "E  
     continue; 'E4`qq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !Od?69W, $  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Qg7rkRia  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 a w0;  
   } & *^FBJEa.  
  } ]vyu!  
 } X `[P11`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JQ>GKu~  
} NV|[.g=lg  
GAZTCkB"  
  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: [3yzVcr~4  
4k HFfc  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); RGeM.  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); :QndeUw  
GTj=R$%09  
  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: o]&w"3vOP0  
P%#EH2J  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +h64idM{U  
{ 6,ZfC<)  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) M~0A-*N  
 { $`2rtF  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 fZ9EE3  
  SaveBmp(); yqy5i{Y  
  return FALSE; )yV|vn  
 } 19Cs 3B\4  
 …… //其它处理及默认处理 Vvth,  
} }Htnhom0n  
|Ef\B] Ns  
pJ` M5pF  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 A9*( O)  
[j6EzMN  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 4Y):d!'b  
yGNZw7^(  
  二、编程步骤 uCc.dluU  
;XJK*QDN  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; r'kUU] j9  
5E~?hWAv  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Dq#/Uw#  
|H:JwxH  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; F{#m~4O  
LQ,RQ~!  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; dLtSa\2Hn  
0WasE1t|  
  5、 添加代码,编译运行程序。 [-Zp[  
E+Jh4$x {  
三、程序代码 nkKiYr  
56;(mbW  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL vybQ}dscn  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9uXuV$.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ U>q&p}z0 H  
#if _MSC_VER > 1000 AN!MFsk  
#pragma once ISQC{K']J  
#endif // _MSC_VER > 1000 }Pm>mQZ},  
#ifndef __AFXWIN_H__ g/)$-Z)Nu  
#error include 'stdafx.h' before including this file for PCH 16iymiLz&  
#endif !Gv*iWg  
#include "resource.h" // main symbols |G2hm8 Y  
class CHookApp : public CWinApp xwjim7# _:  
{ "2>I?  
 public: 0jS"PH?[  
  CHookApp(); ]r #YU0  
  // Overrides g$&uD  
  // ClassWizard generated virtual function overrides :NB,Dz+i  
  //{{AFX_VIRTUAL(CHookApp) }E01B_T9z  
 public: XA cpLj]  
  virtual BOOL InitInstance(); U=?hT&w\S  
  virtual int ExitInstance(); UbBo#(TZ)  
  //}}AFX_VIRTUAL R&z)  
  //{{AFX_MSG(CHookApp) qz|`\^  
  // NOTE - the ClassWizard will add and remove member functions here. )+^1QL  
  // DO NOT EDIT what you see in these blocks of generated code ! omxBd#;F$  
  //}}AFX_MSG T&?0hSYt  
  DECLARE_MESSAGE_MAP() @W\y#5"B  
}; #n=b*.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); kzA%.bP|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); U'pm5Mc\q  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); DzZ)a E  
BOOL InitHotkey(); tEz6B}  
BOOL UnInit(); P;&rh U^[  
#endif oDyrf"dl  
-Cb<T"7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. aR }|^ex  
#include "stdafx.h" 9Fe(],AzF  
#include "hook.h" ? x1"uH  
#include <windowsx.h> ^*;{Uj+O~Y  
#ifdef _DEBUG traJub  
#define new DEBUG_NEW oo{5 :  
#undef THIS_FILE \z}/=Qgc  
static char THIS_FILE[] = __FILE__; {x{/{{wzv  
#endif Yp8~wdm  
#define MAX_KEY 100 /h4 ::,  
#define CTRLBIT 0x04 btq`[gAF\  
#define ALTBIT 0x02 KFCL|9P  
#define SHIFTBIT 0x01 aBPaC=g{HO  
#pragma data_seg("shareddata") yOn +Y  
HHOOK hHook =NULL; l2DhFt$!=  
UINT nHookCount =0; T[w]w  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }$K2h*  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 3Lxk7D>0c  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey \]y4e^FZZ  
static int KeyCount =0; uV]4C^k;`[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ap;tggi(H  
#pragma data_seg() zVLv-U/=d  
HINSTANCE hins; ?[4!2T,Ca  
void VerifyWindow(); ,&S ^Ryc  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) U @Il:\I  
//{{AFX_MSG_MAP(CHookApp) ;4jRsirx9  
// NOTE - the ClassWizard will add and remove mapping macros here. 7wt2|$Qz  
// DO NOT EDIT what you see in these blocks of generated code! %21i#R`E  
//}}AFX_MSG_MAP ,2F4S5F~rC  
END_MESSAGE_MAP() 8^fkY'x  
JPS7L}Kv  
CHookApp::CHookApp() MCamc  
{ .xtjB8gc  
 // TODO: add construction code here, &9CKI/K:  
 // Place all significant initialization in InitInstance F+;{s(wx  
} o C]tEXJ  
B,SH9,  
CHookApp theApp; GW ]E,a  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zy(i]6  
{ 1'5I]D ec  
 BOOL bProcessed=FALSE; <B]\&  
 if(HC_ACTION==nCode) sPCp20x:y8  
 { 9`J!]WQ1[  
  if((lParam&0xc0000000)==0xc0000000){// Key up  \Vis  
   switch(wParam) BX[92~Bq  
   { KKm0@Y   
    case VK_MENU: CroI,=a&,  
     MaskBits&=~ALTBIT; W)"PYC4  
     break; ^(ks^<}  
    case VK_CONTROL: VjU;[  
     MaskBits&=~CTRLBIT; $9znRTFEj  
     break; )!1; =   
    case VK_SHIFT: K 7)1wiEj  
     MaskBits&=~SHIFTBIT; 3F,$} r#  
     break; [/#c9RA  
    default: //judge the key and send message 2e}${NZN  
     break; 9I>+Q&   
   } Q]_3 #_'  
   for(int index=0;index<MAX_KEY;index++){ zr9o  
    if(hCallWnd[index]==NULL) ,s'78Dc$  
     continue; KWU ~QAc  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &Z682b$  
    { <uP>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8y}9X v  
     bProcessed=TRUE; z\Y+5<a  
    } !g /&ws&  
   } .O [RE_j  
  } `BKo`@  
  else if((lParam&0xc000ffff)==1){ //Key down G| pZ  
   switch(wParam) }$W4aG*[  
   { .I{b]6  
    case VK_MENU: ?45kN=%*s  
     MaskBits|=ALTBIT; ScrEtN  
     break; 6JWCB9$4  
    case VK_CONTROL: k%\_UYa  
     MaskBits|=CTRLBIT; **rA/*Oc  
     break;  `"v5bk  
    case VK_SHIFT: .BGM1ph}~  
     MaskBits|=SHIFTBIT; @;}bBHQz{p  
     break; ^(I4Do~}  
    default: //judge the key and send message mrDIt4$D  
     break; P&3'N~k-  
   } SCk2D!u  
   for(int index=0;index<MAX_KEY;index++) ~U&,hFSPY  
   { &6A'}9Ch  
    if(hCallWnd[index]==NULL) 3kFOs$3  
     continue; 7s_#X|A$  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &H!3]  
    { [B9'/:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); NLFSw  
     bProcessed=TRUE; "}UJ~ j).  
    } #Ag-?k  
   } ko2Kz k  
  } Ghgx8 ]e  
  if(!bProcessed){ gnmKh>0@6o  
   for(int index=0;index<MAX_KEY;index++){ J=4R" _yo  
    if(hCallWnd[index]==NULL) u-Pa:wm0-  
     continue; o.t$hv|  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) O"4Q=~Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); qG7^XO Ws-  
   } A87JPX#R?  
  } ryzz!0l  
 } c0]^V>}cl  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); c[ ]_gUp8  
} ; >3q@9\D  
i(9=` A}  
BOOL InitHotkey() v_f8zk  
{ ~lMw*Qw^  
 if(hHook!=NULL){ "bAkS}(hB(  
  nHookCount++; OaU-4 ~n;  
  return TRUE; m xtLcG4G  
 } Z%~j)  
 else LRBcW;.Su  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7QP%Pny%  
  if(hHook!=NULL) x[7jm"Pz  
   nHookCount++; fk)ts,p?  
  return (hHook!=NULL); tS,nO:+x  
} |du@iA]dP  
BOOL UnInit() *,hS-  
{ LtKiJ.j?A  
 if(nHookCount>1){ t3K7W2bz  
  nHookCount--; D.o|pTZ  
  return TRUE; 0 Vv 6B2<  
 } trmCIk&Fkj  
 BOOL unhooked = UnhookWindowsHookEx(hHook);  lk{  
 if(unhooked==TRUE){ XnrOC|P$  
  nHookCount=0; D/jB .  
  hHook=NULL; G?!b00H  
 } Z^,C><Yt  
 return unhooked; 2b xkZS]  
} 'EJ8)2  
/*g3TbUs  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Ed,`1+  
{ zu&5[XL  
 BOOL bAdded=FALSE; (Da/$S.  
 for(int index=0;index<MAX_KEY;index++){ / <WB%O  
  if(hCallWnd[index]==0){ / ]_T  
   hCallWnd[index]=hWnd; y0>asl  
   HotKey[index]=cKey; 'M185wDdAl  
   HotKeyMask[index]=cMask; 7P O3{I  
   bAdded=TRUE; 6lO]V=+  
   KeyCount++; VTySKY+  
   break; +9G GC  
  } `E>HpRcxD  
 } w\k|^  
 return bAdded; C J S  
} )ALPMmlRs  
M>dP 1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) I&]d6,  
{ HXhz|s0  
 BOOL bRemoved=FALSE; 'Ca6cm3Tg  
 for(int index=0;index<MAX_KEY;index++){ \bqIe}3V7  
  if(hCallWnd[index]==hWnd){ PHl{pE*  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ &=H{ 36i@  
    hCallWnd[index]=NULL; w*<XPBi  
    HotKey[index]=0; NR-d|`P;  
    HotKeyMask[index]=0; ?>5[~rMn  
    bRemoved=TRUE; GqumH/;  
    KeyCount--; i`/_^Fndyu  
    break; q\ FF)H  
   } ES!$JWK|  
  } / PG+ s6  
 } PE3FuJGz  
 return bRemoved; QU^*(HGip  
} r#iZ FL3q  
Jm$. $B&I  
void VerifyWindow() }]_/:KUt  
{ aAZS^S4v  
 for(int i=0;i<MAX_KEY;i++){ r=P)iE:  
  if(hCallWnd!=NULL){ l T~RH0L  
   if(!IsWindow(hCallWnd)){ r2}u\U4>  
    hCallWnd=NULL; =; Gw=m(  
    HotKey=0; Gm;)Om_  
    HotKeyMask=0; Aifc0P-H  
    KeyCount--; \Km!#:  
   } e5KsKzu a  
  } $X8(OS5d'  
 } }S51yDVG_  
} '^ bB+  
zY~  
BOOL CHookApp::InitInstance() 5vs~8|aRo  
{ nf& P Dv1  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); XlUM~(7+v  
 hins=AfxGetInstanceHandle(); [ qt hn[3  
 InitHotkey(); O=UXe]D  
 return CWinApp::InitInstance(); ehk5U,d  
} vN:gu\^-   
8uq^Q4SU  
int CHookApp::ExitInstance() >Jh*S`e  
{ F8M&.TE_3  
 VerifyWindow(); y\K r@;q0w  
 UnInit();  H"czF  
 return CWinApp::ExitInstance(); K}"xZy Tm1  
} x8k7y:  
's>   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file a5=8zO#%g  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [P.M>"c\  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ j#QJ5(#  
#if _MSC_VER > 1000 1O@ qpNm  
#pragma once q/U(j&8W{  
#endif // _MSC_VER > 1000 n&ZA rJ  
r(;oDdVc  
class CCaptureDlg : public CDialog nVkx Q?2  
{ jGpSECs  
 // Construction C(zgBk  
 public: |f), dC  
  BOOL bTray; |U{9Yy6p  
  BOOL bRegistered; F: %-x=q  
  BOOL RegisterHotkey(); l?pF?({  
  UCHAR cKey; lM1~ K  
  UCHAR cMask; cb!mV5M-g  
  void DeleteIcon(); TI4#A E  
  void AddIcon(); ,5oe8\uz  
  UINT nCount; "1 O!Ck_n  
  void SaveBmp(); {$D[l hj  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Cbu/7z   
  // Dialog Data !>QS746S@  
  //{{AFX_DATA(CCaptureDlg) fB^h2  
  enum { IDD = IDD_CAPTURE_DIALOG }; xIu #  
  CComboBox m_Key; Py*( %  
  BOOL m_bControl; M)S(:Il6Xx  
  BOOL m_bAlt; z~&uLu  
  BOOL m_bShift; -^sW{s0Rc  
  CString m_Path; `roos<F1D  
  CString m_Number; < kyT{[e+6  
  //}}AFX_DATA Zjqa n  
  // ClassWizard generated virtual function overrides )!6JSMS  
  //{{AFX_VIRTUAL(CCaptureDlg) <T]%Gg8  
 public: },58B  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 0K/Pth"*  
 protected: k(LZ,WSR  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,/0Q($oz  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 8B#;ffkmN  
  //}}AFX_VIRTUAL $pW6a %7  
  // Implementation iV9wqUkMv  
 protected: j>j Zg<}J  
  HICON m_hIcon; J{>9ctN  
  // Generated message map functions )9/.K'o,dy  
  //{{AFX_MSG(CCaptureDlg) A!Em J  
  virtual BOOL OnInitDialog(); j"(o>b v7  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); "Tw4'AY'P  
  afx_msg void OnPaint(); EmrUzaGD  
  afx_msg HCURSOR OnQueryDragIcon(); od~^''/b  
  virtual void OnCancel(); (Z:(f~;  
  afx_msg void OnAbout(); 1Q_  C  
  afx_msg void OnBrowse(); ?88k`T'EI  
  afx_msg void OnChange(); W\]bh'(  
 //}}AFX_MSG ;R[  xo!  
 DECLARE_MESSAGE_MAP() |OW/-&)  
}; y8} fj=  
#endif 7$3R}=Z`\q  
S1jI8 #z}_  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file m(0sG(A~  
#include "stdafx.h" 4I7B #{  
#include "Capture.h" \s_lB~"P!3  
#include "CaptureDlg.h" rJLn=|uR  
#include <windowsx.h> 3V=(P.ATm  
#pragma comment(lib,"hook.lib") aq~>$CHa  
#ifdef _DEBUG /$NDH]a  
#define new DEBUG_NEW t][U`1>i  
#undef THIS_FILE zED#+-7  
static char THIS_FILE[] = __FILE__; yx5F]Z<M2  
#endif b-*3]gB  
#define IDM_SHELL WM_USER+1 6P,vGmR  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ]U[y3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Pjz_KO/  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; a=ye!CN^  
class CAboutDlg : public CDialog EQQ/E!N8l  
{ b"D? @dGB,  
 public: tG8)!  
  CAboutDlg(); nc<w DE6  
  // Dialog Data 5x$/.U  
  //{{AFX_DATA(CAboutDlg) `O~NT'Ed8  
  enum { IDD = IDD_ABOUTBOX }; Mc8|4/<Z  
  //}}AFX_DATA u&4CXv=  
  // ClassWizard generated virtual function overrides 5ggmS<=  
  //{{AFX_VIRTUAL(CAboutDlg) fZQL!j4  
 protected: jA'qXc+\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &d,chb (  
  //}}AFX_VIRTUAL ~nit~ ;  
  // Implementation `As| MYv  
 protected: D$ X9xtT  
  //{{AFX_MSG(CAboutDlg) 7  s+j)  
  //}}AFX_MSG un*Ptc2%  
  DECLARE_MESSAGE_MAP() (pBPf  
}; jbQ N<`!  
XKp$v']u  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) E`E$ }iLs  
{ bBx.snBK  
 //{{AFX_DATA_INIT(CAboutDlg) )-qWcf?   
 //}}AFX_DATA_INIT oZM6%-@qi  
} g)Ep'd-w"  
TFZvZi$u&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $H0diwl9R  
{ hKkUsY=R  
 CDialog::DoDataExchange(pDX); Ufx^@%v  
 //{{AFX_DATA_MAP(CAboutDlg) 2T3TD%  
 //}}AFX_DATA_MAP C%c}lv8;^  
} ^3>Qf  
MHF31/g\  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Z|78>0SAt  
 //{{AFX_MSG_MAP(CAboutDlg) M.DU^-7  
 // No message handlers J#k3iE}  
 //}}AFX_MSG_MAP '(ZJsw  
END_MESSAGE_MAP() ]V*ku%L0  
6snDv4  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 0^%\! Xxq  
: CDialog(CCaptureDlg::IDD, pParent) 3K{XT),  
{ ';H"Ye:D=7  
 //{{AFX_DATA_INIT(CCaptureDlg) O &/9wi>!q  
  m_bControl = FALSE; r'TxYM-R  
  m_bAlt = FALSE; [_$r-FA  
  m_bShift = FALSE; :eK(9o  
  m_Path = _T("c:\\"); l ~bjNhk  
  m_Number = _T("0 picture captured."); )7X+T'?%  
  nCount=0; B: '}SA{  
  bRegistered=FALSE; 6CQ.>M:R  
  bTray=FALSE; $5(_U  
 //}}AFX_DATA_INIT "hE/f~\  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 |_<'q h  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); d3nx"=Cy0I  
} t=-t xnlr<  
nqp:nw  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) /mdPYV  
{ #F>7@N:5  
 CDialog::DoDataExchange(pDX); ^*6So3  
 //{{AFX_DATA_MAP(CCaptureDlg) }JP0q  
  DDX_Control(pDX, IDC_KEY, m_Key); ]^f7s36  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4=; . <  
  DDX_Check(pDX, IDC_ALT, m_bAlt); XwZ~pY ~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); WO}l&Q  
  DDX_Text(pDX, IDC_PATH, m_Path); {|R@\G.1(  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \>B$x@-wg  
 //}}AFX_DATA_MAP t^8 ii  
} +2DzX/3  
^Vbx9UN/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 73n|G/9n[  
//{{AFX_MSG_MAP(CCaptureDlg) |iGfX,C|  
 ON_WM_SYSCOMMAND() xgdS]Sz  
 ON_WM_PAINT() i146@<\G{P  
 ON_WM_QUERYDRAGICON() L9lNAiOH  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |*G$ilu  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) dz3KBiq  
 ON_BN_CLICKED(ID_CHANGE, OnChange) xH,D bAC;  
//}}AFX_MSG_MAP 2&e2/KEWR  
END_MESSAGE_MAP() \+?>KpE,b  
[RAzKzC\M  
BOOL CCaptureDlg::OnInitDialog() Fi7G S;  
{ 'zRi ;:UHA  
 CDialog::OnInitDialog(); %i!=.7o.  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .Lwp`{F/  
 ASSERT(IDM_ABOUTBOX < 0xF000); .J/x@  
 CMenu* pSysMenu = GetSystemMenu(FALSE); kiah,7V/  
 if (pSysMenu != NULL) z;c~(o@4  
 { j{U#g8  
  CString strAboutMenu; LnwI 7uvq  
  strAboutMenu.LoadString(IDS_ABOUTBOX); xJ-(]cO'  
  if (!strAboutMenu.IsEmpty())  0 |/:m  
  { fbl8:c)I  
   pSysMenu->AppendMenu(MF_SEPARATOR); qI]PM9  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); uG5RE  
  } &-S;.}  
 } BLepCF38  
 SetIcon(m_hIcon, TRUE); // Set big icon U-U^N7  
 SetIcon(m_hIcon, FALSE); // Set small icon "7> o"FQ  
 m_Key.SetCurSel(0); .5S< G)Ja  
 RegisterHotkey(); rE&` G[(b  
 CMenu* pMenu=GetSystemMenu(FALSE); T<jo@z1UL  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); P#0U[`ltK  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); s8r|48I#;  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND);  (0wQ [(  
 return TRUE; // return TRUE unless you set the focus to a control "e3T;M+  
} i 4}4U  
WxLmzSz{xD  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) v+), uj  
{ 6w?l I  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) +qWrm |O]  
 { ~PTqR2x  
  CAboutDlg dlgAbout; N7wKaezE  
  dlgAbout.DoModal(); dy }O6  
 } QbN7sg~~  
 else slQxz;t  
 { cC4 2b2+  
  CDialog::OnSysCommand(nID, lParam); rXIFCt8J  
 } k=nN#SMn  
} *y}<7R  
$] gwaJ:  
void CCaptureDlg::OnPaint() NcuZw?  
{ #mK/xbW  
 if (IsIconic()) :jKiHeBQu?  
 { F6L}n-p5  
  CPaintDC dc(this); // device context for painting }L!%^siG_  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); vp[;rDsIJ$  
  // Center icon in client rectangle %',bCd{QW  
  int cxIcon = GetSystemMetrics(SM_CXICON); A"Prgf eT  
  int cyIcon = GetSystemMetrics(SM_CYICON); Fm{/&U^  
  CRect rect; 71RG1,  
  GetClientRect(&rect); `wMHjcUP  
  int x = (rect.Width() - cxIcon + 1) / 2; MrW*6jY@  
  int y = (rect.Height() - cyIcon + 1) / 2; <FkoWN  
  // Draw the icon Dc1tND$X3g  
  dc.DrawIcon(x, y, m_hIcon); 2 cB){.E  
 } <n+]\a97*  
 else x5X;^.1Fr  
 { >~%EB?8  
  CDialog::OnPaint();  9Kpzj43  
 } F0D7+-9[  
} 96VJE,^h  
~!Ar`= [  
HCURSOR CCaptureDlg::OnQueryDragIcon() o94]:$=~  
{ Vgj&h dbd  
 return (HCURSOR) m_hIcon; <[oPh(!V  
} 5z T~/6-(  
&'mq).I2  
void CCaptureDlg::OnCancel() eG @0:  
{ Ala~4_" WL  
 if(bTray) l DWg%pI+  
  DeleteIcon(); +WH|nV~lQ  
  CDialog::OnCancel(); #W]4aZ1  
} #A:+|{H"  
]N& Y25oT5  
void CCaptureDlg::OnAbout() nt5x[xa  
{ m|CB')  
 CAboutDlg dlg; u2FD@Xq?  
 dlg.DoModal(); q!qOy/}D  
} +L]$M)*0&  
TV['"'D&i  
void CCaptureDlg::OnBrowse() cu@i;Hb@  
{ b3vPGR  
 CString str; fOHgz ,x=  
 BROWSEINFO bi; 2 omKP,9,2  
 char name[MAX_PATH]; AB:JXMyK  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 2~wIHtd  
 bi.hwndOwner=GetSafeHwnd(); xMpQPTte  
 bi.pszDisplayName=name; ; 1^ ([>|  
 bi.lpszTitle="Select folder"; +HpPVuV  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; S>6f0\F/Y%  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); rsGQ :c  
 if(idl==NULL) ^^;#Si  
  return; 9_4bw9 A  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 2VZdtz  
 str.ReleaseBuffer(); JO&~mio  
 m_Path=str; xh90qm  
 if(str.GetAt(str.GetLength()-1)!='\\') -".q=$f  
  m_Path+="\\"; |Y9mre.Y;  
 UpdateData(FALSE); Qm >x ?  
} =.Hq]l6+  
Ld9YbL:  
void CCaptureDlg::SaveBmp() $*k9e^{S  
{ I\8F.J1_  
 CDC dc; Jfe<$-$$7  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Ed>Dhy6\r  
 CBitmap bm; Nr(t5TP^  
 int Width=GetSystemMetrics(SM_CXSCREEN); YWK|AT-4  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2X)n.%4g$;  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2BGS$$pP  
 CDC tdc; rZi\  
 tdc.CreateCompatibleDC(&dc); rYP72<   
 CBitmap*pOld=tdc.SelectObject(&bm); ;UnJrP-if  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); j} .,|7X  
 tdc.SelectObject(pOld); }}Kj b  
 BITMAP btm; P\nz;}nv  
 bm.GetBitmap(&btm); h;lg^zlTb  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +%'!+r l  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); en?J#fz  
 BITMAPINFOHEADER bih; c?/R=/H  
 bih.biBitCount=btm.bmBitsPixel; |n/qJIE6  
 bih.biClrImportant=0; !%lcn O  
 bih.biClrUsed=0; K8?]&.!  
 bih.biCompression=0; b<]Ae!I'  
 bih.biHeight=btm.bmHeight; li +MnLt  
 bih.biPlanes=1; -"9&YkN  
 bih.biSize=sizeof(BITMAPINFOHEADER); :MFF*1  
 bih.biSizeImage=size; vTk\6o q  
 bih.biWidth=btm.bmWidth; 2x<A7l)6  
 bih.biXPelsPerMeter=0; 937 z*mh  
 bih.biYPelsPerMeter=0; Ht,dMt>:  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); hh1 ?/  
 static int filecount=0; F3Y/Miw  
 CString name; >2)`/B9f4  
 name.Format("pict%04d.bmp",filecount++); -V_iv/fmM  
 name=m_Path+name; s-[v[w'E  
 BITMAPFILEHEADER bfh; <=g{E-  
 bfh.bfReserved1=bfh.bfReserved2=0; |3:e$  
 bfh.bfType=((WORD)('M'<< 8)|'B'); NU <K+k  
 bfh.bfSize=54+size; .IkQo`_s:  
 bfh.bfOffBits=54; i*\\j1mf  
 CFile bf; d7 W[.M$]  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ vhz[H  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); _=Eb:n+X  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +bhR[V{0g  
  bf.WriteHuge(lpData,size); }NgevsV>;  
  bf.Close(); {)5tov1  
  nCount++; WW&ag r  
 } +k<0: Fi  
 GlobalFreePtr(lpData); Zai:?%^  
 if(nCount==1) Gp.XTz#=  
  m_Number.Format("%d picture captured.",nCount); x,rK4L7U  
 else Q&k1' nT5  
  m_Number.Format("%d pictures captured.",nCount); -L6YLe%w  
  UpdateData(FALSE); N0POyd/rL  
}  D_D76  
!*1Kjg3  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) >DSD1i+N  
{ d&x #9ka  
 if(pMsg -> message == WM_KEYDOWN) ,ej89  
 {  d  H ;  
  if(pMsg -> wParam == VK_ESCAPE) y~Ts9AE  
   return TRUE; " R5! VV  
  if(pMsg -> wParam == VK_RETURN) >K@Y8J+ e#  
   return TRUE; lB< kf1[  
 } N\nxo0sl  
 return CDialog::PreTranslateMessage(pMsg); OciPd/6  
} KM:k<pvi  
8TH fFL  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 62D UF  
{ _B6W:k|-7l  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ W3E7y?  
  SaveBmp(); h|Ah\P?o  
  return FALSE; D9 \!97  
} !$Whftg  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~e;2gm  
 CMenu pop; 7E]qP 5  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); \96aHOk<  
 CMenu*pMenu=pop.GetSubMenu(0); Py^fWQ5I~%  
 pMenu->SetDefaultItem(ID_EXITICON); +v{g'  
 CPoint pt; |J^}BXW'^)  
 GetCursorPos(&pt); wOLA8UYW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ^NB\[ &  
 if(id==ID_EXITICON) 9,J^tN@^  
  DeleteIcon(); 0 YA  
 else if(id==ID_EXIT) _@L{]6P%V  
  OnCancel(); E-v#G~  
 return FALSE; $s S;#r0  
} sL",Ho  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 1{Kv  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ODFCA. t  
 AddIcon(); 5==hyIy  
 return res; DV!10NqUr  
} @lhjO>@#I  
6cVJu%<V  
void CCaptureDlg::AddIcon() jV 98 2Y  
{ [~Vj(H=KwI  
 NOTIFYICONDATA data; $Le|4Hj  
 data.cbSize=sizeof(NOTIFYICONDATA); J-U5_>S  
 CString tip; b sM ]5^  
 tip.LoadString(IDS_ICONTIP); m#Dae\w&  
 data.hIcon=GetIcon(0); /BQB7vL  
 data.hWnd=GetSafeHwnd(); A8T75?lL(  
 strcpy(data.szTip,tip); MY w3+B+Jj  
 data.uCallbackMessage=IDM_SHELL; <nk7vo?Ks  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }v4T&/vt-  
 data.uID=98; I3^}$#>  
 Shell_NotifyIcon(NIM_ADD,&data); YW7Pimks  
 ShowWindow(SW_HIDE); I ]HP  
 bTray=TRUE; CBKLct>  
} );!IGcgF  
< .knM  
void CCaptureDlg::DeleteIcon() AV]7l}-  
{ ; nc3O{rU  
 NOTIFYICONDATA data; yR$ld.[uf  
 data.cbSize=sizeof(NOTIFYICONDATA); jzb%?8ZJ  
 data.hWnd=GetSafeHwnd(); |6o!]~&e$1  
 data.uID=98; pybE0]   
 Shell_NotifyIcon(NIM_DELETE,&data); iyJx~:  
 ShowWindow(SW_SHOW); 6 qK`X  
 SetForegroundWindow(); \u$[$R5  
 ShowWindow(SW_SHOWNORMAL); !L3\B_#  
 bTray=FALSE; wi-F@})f#  
} >`=9So_J  
k; (r:k^  
void CCaptureDlg::OnChange() y"T(Unvc  
{ KJYcP72P  
 RegisterHotkey(); H aA2y  
} +[B@83  
(,I9|  
BOOL CCaptureDlg::RegisterHotkey() ep)O|_=  
{ H~<w*[uT  
 UpdateData(); }Hy4^2B  
 UCHAR mask=0; /*1p|c^  
 UCHAR key=0; r0/aw  
 if(m_bControl) )F'r-I%Hi  
  mask|=4; =Y {<&:%(  
 if(m_bAlt) _@@.VmZL  
  mask|=2; sIzy/W0iV  
 if(m_bShift) M{4U%lk  
  mask|=1; CNl @8&R  
  key=Key_Table[m_Key.GetCurSel()]; wBI>H 7A  
 if(bRegistered){ A/sM ?!p>_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &HB!6T/  
  bRegistered=FALSE; :y1,OR/k  
 } #5yz~&  
 cMask=mask; HAmAmEc,  
 cKey=key; FjV)QP H  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); FSD~Q&9&  
 return bRegistered; F10TvJ U  
} [9d4 0>e  
`Rx\wfr}  
  四、小结 %V|n2/O Y  
/2>.*H_2  
  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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