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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: DP*V|)  
  2-g 5Gb2|  
  一、实现方法 9Y# vKb{>  
0\ j)!b  
  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: P&o+ut:  
=hh,yi  
#pragma data_seg("shareddata") {2g?+8L$Z  
HHOOK hHook =NULL; //钩子句柄 &{M-<M  
UINT nHookCount =0; //挂接的程序数目 f]Z9=  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 u`+kH8#  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 [F *hjGLc}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey "wV7PSbM  
static int KeyCount =0; O'~^wu.  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3=L5Y/  
#pragma data_seg() SV2\vby}C  
LGRhCOP:  
  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。 C0e oV}  
0F 4%Xz  
  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: @DR?^ qp  
7&|&y SCu  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR c_ 1.  
cKey,UCHAR cMask) F JxH{N6a  
{ _B==S4^/yU  
 BOOL bAdded=FALSE; gWjz3ob  
 for(int index=0;index<MAX_KEY;index++){ $kQQdF  
  if(hCallWnd[index]==0){ bb`DyUy ^+  
   hCallWnd[index]=hWnd; NydoX9  
   HotKey[index]=cKey; a,*|*Cv  
   HotKeyMask[index]=cMask; /Q9iO&Vu  
   bAdded=TRUE; G`jJKiC  
   KeyCount++; 5m6I:s`pK  
   break; ?0+J"FH# W  
  } Wf$P+i*  
 } \9.@T g8`  
 return bAdded; /@s(8{;  
} 2I~a{:O  
//删除热键 %LdFS~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) :"oUnBY%  
{ b;(BMO,(  
 BOOL bRemoved=FALSE; G?yG|5.pU  
 for(int index=0;index<MAX_KEY;index++){ ?m.Ry  
  if(hCallWnd[index]==hWnd){ $k3l[@;hE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ EtvYIfemr  
    hCallWnd[index]=NULL; |f&=9%  
    HotKey[index]=0; bU"2D.k  
    HotKeyMask[index]=0; KA0_uty/T  
    bRemoved=TRUE; 2Yd;#i)  
    KeyCount--; >9]i#So^  
    break; 4^BHJOvs  
   } 1|\/2  
  } #v4q:&yKf  
 } K0?:?>*b#  
 return bRemoved; K~>ESMZ5  
} wS1zd?  
wTY8={p]  
-r"h [UV)  
  DLL中的钩子函数如下: 1{X ;&y  
y]ZujfW7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `~3y[j]kO  
{ d_}q.%*  
 BOOL bProcessed=FALSE; o]*#|4-  
 if(HC_ACTION==nCode) b6UD!tXp  
 { R~DZY{u+/$  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 )o8]MWT\;  
   switch(wParam) UDz#?ZWnd  
   {  PG/xX H  
    case VK_MENU: ~<#!yRy>r  
     MaskBits&=~ALTBIT; eE-@dU?  
     break; 9W <I~  
    case VK_CONTROL: $>fMu   
     MaskBits&=~CTRLBIT; kMLWF  
     break; /? j vv&  
    case VK_SHIFT: 1tQl^>r16  
     MaskBits&=~SHIFTBIT; )9 QeVf  
     break; Pb^Mc <j  
    default: //judge the key and send message .3.oan*i  
     break; wd`lN,WiW  
   } >1Y',0v  
   for(int index=0;index<MAX_KEY;index++){ +5+?)8Ls  
    if(hCallWnd[index]==NULL) IA XoEBlMs  
     continue; \We\*7^E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [nam H a  
    { ED={OZD8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); WU -_Y^  
     bProcessed=TRUE; Z'vGX,:  
    } #JH#Qg  
   } / b_C9'S  
  } 9_z u*  
  else if((lParam&0xc000ffff)==1){ //有键按下 +JMB98+l  
   switch(wParam) !V6O~#  
   { ul$^]ZWkI  
    case VK_MENU: l25E!E-'b  
     MaskBits|=ALTBIT; v/E_A3Ay&  
     break; c.u$NnDU6  
    case VK_CONTROL: ^$7Lmd.qI  
     MaskBits|=CTRLBIT; S WYIQ7*  
     break; :i&ZMH,O  
    case VK_SHIFT: z;_fO>u:  
     MaskBits|=SHIFTBIT; 9w Pc03a  
     break; >t,BNsWB  
    default: //judge the key and send message i%8I (F  
     break; s^]F4'  
   } S&A, Q'  
   for(int index=0;index<MAX_KEY;index++){ X/_e#H0  
    if(hCallWnd[index]==NULL) $\|$ekil4  
     continue; s 9,?"\0Zm  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YI=03}I  
    { v(T;Y=&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ][|)qQ%V  
     bProcessed=TRUE; Ub%al D  
    } d?RKobk  
   } ik@g;>pQD  
  } MOuI;EF  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 dc MWCK  
   for(int index=0;index<MAX_KEY;index++){ ZqHh$QBD 9  
    if(hCallWnd[index]==NULL) %C_RBd  
     continue; HB+\2jEE  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) W_NQi  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); NJG-~ w  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 p!MOp-;-  
   } .u3!%{/v(c  
  } !\Y85o>JU  
 } pm+_s]s,  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4#$~gTc@  
} ^mLZT*   
t{\FV@R  
  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: Iz/o|o]#  
 7(;M  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2f8fA'|O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ?*I2?   
NJfI9L  
  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: x | =  
uV r6tb1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) @B;2z_Y!l  
{ (|_1ku3!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) uXiAN#1  
 { ^YddVp  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 \IL/?J 5d  
  SaveBmp(); @EZ@X/8{&  
  return FALSE; *f8; #.Re  
 } QMoh<[3qu  
 …… //其它处理及默认处理 7mipj]  
} Zgt:ZO  
{VBx;A3*I  
hnM?wn  
  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。 xc.(-g[  
(9hCO-r  
  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。 A`Vz5WB  
6-U+<[,x  
  二、编程步骤 Q}GsCmt=)O  
Q}p+/-U\  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; ( H/JB\~r  
V!#+Ti/w4  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; . :Q[Z  
Y4cIYUSc  
  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; j(4BMk  
Tw BwqQ)t  
  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; (Zi(6 T\z  
}gQ FWT  
  5、 添加代码,编译运行程序。 X~ n=U4s}O  
xc[Lb aBG  
三、程序代码 4 G`7]<  
s`W\`w}  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL %~ uMa  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) =h,6/cs  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ aIV(&7KT4  
#if _MSC_VER > 1000 >S4klW=*I  
#pragma once [)V&$~xW  
#endif // _MSC_VER > 1000 +b_g,RNs!  
#ifndef __AFXWIN_H__ ?bwF$Ku  
#error include 'stdafx.h' before including this file for PCH IXYSZ)z  
#endif o<@b]ukl&  
#include "resource.h" // main symbols Ag1*.t|  
class CHookApp : public CWinApp /fCj;8T3o  
{ Hn"xn79nc  
 public: MW|Qop[  
  CHookApp(); >[TB8  
  // Overrides  DJ?kQ  
  // ClassWizard generated virtual function overrides dn0?#=  
  //{{AFX_VIRTUAL(CHookApp) Lc ,te1  
 public: \a]JH\T)Q  
  virtual BOOL InitInstance(); o:E+c_^q`  
  virtual int ExitInstance(); ssVO+ T  
  //}}AFX_VIRTUAL )SG+9!AbMZ  
  //{{AFX_MSG(CHookApp) fpbb <Ro  
  // NOTE - the ClassWizard will add and remove member functions here. KLv`Xg\  
  // DO NOT EDIT what you see in these blocks of generated code ! 7kmU/(8  
  //}}AFX_MSG pE{ZWW[@+  
  DECLARE_MESSAGE_MAP() '51DdT U  
}; (=:9pbP  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 5:(uD3]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); H\]ZtSw8-  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .kWMr^ g  
BOOL InitHotkey(); kL;sA'I:S  
BOOL UnInit();  # Vz9j  
#endif M&P?/Zi=L  
mY9^W2:  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 1U[8OM{$  
#include "stdafx.h" [<m1xr4"k  
#include "hook.h" JSXudz5 c  
#include <windowsx.h> P,y*H_@k  
#ifdef _DEBUG ceN*wkGyB  
#define new DEBUG_NEW \6A-eWIQif  
#undef THIS_FILE (`+%K_  
static char THIS_FILE[] = __FILE__; J7:VRf|,?(  
#endif }3sj{:z{  
#define MAX_KEY 100 Pg[XIfBva  
#define CTRLBIT 0x04 *FoH '\=  
#define ALTBIT 0x02 $$7Mq*a>  
#define SHIFTBIT 0x01 b#;%TbDF  
#pragma data_seg("shareddata") 5Ug.J{d  
HHOOK hHook =NULL; 2QwdDKMS_  
UINT nHookCount =0; TVVL1wZ  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey XB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT < GoUth.#  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey G gmv(!  
static int KeyCount =0; r}k2n s9  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift W]E6<y'  
#pragma data_seg() P]]re,&R  
HINSTANCE hins; !1 :%!7  
void VerifyWindow(); Le#>uWM  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) MVdX  
//{{AFX_MSG_MAP(CHookApp) rro92(y  
// NOTE - the ClassWizard will add and remove mapping macros here. ``*iK  
// DO NOT EDIT what you see in these blocks of generated code! O_%X>Q9  
//}}AFX_MSG_MAP 'Fi\Qk'D@  
END_MESSAGE_MAP() }7p`8?  
Pf`HF|NI  
CHookApp::CHookApp() JJ\|FZ N  
{ ) #G5XS+)  
 // TODO: add construction code here, F+yu[Dh:  
 // Place all significant initialization in InitInstance v@_}R_pX  
} T,z 7U2O  
uE{r09^q\  
CHookApp theApp; s~N WJ*i  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \09m ?;^  
{ [n%=2*1p  
 BOOL bProcessed=FALSE; )b^yAzL?  
 if(HC_ACTION==nCode) quXL'g  
 { u.!}s2wT#  
  if((lParam&0xc0000000)==0xc0000000){// Key up X2CpA;#;7l  
   switch(wParam) klkshlk d  
   { W=zHD 9  
    case VK_MENU: {D6lS j  
     MaskBits&=~ALTBIT; tzH~[n,  
     break; N %;bV@A9  
    case VK_CONTROL: ^FO&GM2a  
     MaskBits&=~CTRLBIT; 0\W6X;?  
     break; 90R z#qrI*  
    case VK_SHIFT: IIj :\?r  
     MaskBits&=~SHIFTBIT; !2 YvG%t^6  
     break; F3)w('h9c  
    default: //judge the key and send message {lv@V*_Y0  
     break; Z=c&</9e  
   }  .7GTL  
   for(int index=0;index<MAX_KEY;index++){ <L!9as]w  
    if(hCallWnd[index]==NULL) [g<rzhC~=  
     continue; _x+)Tv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) &k\`!T1  
    { l~",<bTc  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 0oT~6BGm  
     bProcessed=TRUE; <c; U 0! m  
    } ' ozu4y  
   } TR7j`?  
  } wqx9  
  else if((lParam&0xc000ffff)==1){ //Key down :'6vIPN5  
   switch(wParam) h*X5O h6  
   { G;jX@XqZ  
    case VK_MENU: luvxwved  
     MaskBits|=ALTBIT; HpCTQ\H  
     break; w20)~&LE-  
    case VK_CONTROL: =lb5 #  
     MaskBits|=CTRLBIT; 3ncL351k  
     break; nO#a|~-))  
    case VK_SHIFT: %fJ~ 3mu  
     MaskBits|=SHIFTBIT; lGhhH _  
     break; #[odjSb  
    default: //judge the key and send message (&o|}"kRq  
     break; ?1afW)`a.v  
   } L9Z\|L5  
   for(int index=0;index<MAX_KEY;index++) u.yjk/jF  
   { I+GP`=\  
    if(hCallWnd[index]==NULL) /#Gm`BT  
     continue; O\X=vh/D  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) '.gLqm}%  
    { { POfT m}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); K^m`3N"  
     bProcessed=TRUE; # A#,]XP  
    } n_9Wrx328  
   } Nu,t,&B   
  } k*u4N  
  if(!bProcessed){ Ewq7oq5:  
   for(int index=0;index<MAX_KEY;index++){ N2uTWT>  
    if(hCallWnd[index]==NULL) E0t%]?1  
     continue; 0Qr|!B:+9)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oAt{ #v  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); VJbn/5+P  
   } Bk;/>gD  
  } nd)`G$gL  
 } JWsOze 8#  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 2{A/Fbk  
} &Db'}Y?x]  
YgLHp/  
BOOL InitHotkey() CyKupJ.Fq  
{ uB;PaZ G?{  
 if(hHook!=NULL){ K<vb4!9Z9  
  nHookCount++; OrRU$5Lo  
  return TRUE; ekPn`U  
 } fX/k;0l  
 else *@E&O^%cO  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); jmr1e).];  
  if(hHook!=NULL) mQ=nU  
   nHookCount++; {1}p+dEK  
  return (hHook!=NULL); |IZFWZd  
} eMOnzW|h  
BOOL UnInit() xlm:erP  
{ js[H $  
 if(nHookCount>1){ P"s7}cl  
  nHookCount--; 4mci@1K#^  
  return TRUE; W@WKdaJ  
 } &d6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ,3bAlc8D7  
 if(unhooked==TRUE){ 8C4v  
  nHookCount=0; AkX8v66:  
  hHook=NULL; pP*`b<|  
 } %&&;06GU}  
 return unhooked; v]U0@#/p  
} r!)jxIL\  
^2eH0O!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ~IS3i'bh  
{ E-b3#\^:  
 BOOL bAdded=FALSE; e"]DIy4s  
 for(int index=0;index<MAX_KEY;index++){ Ji;R{tZ.R  
  if(hCallWnd[index]==0){ Sz0CP1WB  
   hCallWnd[index]=hWnd; ^ jT1q_0  
   HotKey[index]=cKey; 1J[|Ow  
   HotKeyMask[index]=cMask; P7y.:%DGD0  
   bAdded=TRUE; 5tcJT z  
   KeyCount++; .*c%A^>  
   break; }x+s5a;!3/  
  } ;0Mg\~T~'  
 } )kt,E}609  
 return bAdded; )"H r3  
} DtOL=m]s  
xYD.j~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) #]e](j>]  
{ "Rq)%o$Z  
 BOOL bRemoved=FALSE; { GKqOu  
 for(int index=0;index<MAX_KEY;index++){ 8\9s,W:5  
  if(hCallWnd[index]==hWnd){ -:  8[  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Fy-|E>@]D  
    hCallWnd[index]=NULL; &J}w_BFww  
    HotKey[index]=0; "6xTh0D  
    HotKeyMask[index]=0; )+v' @]r  
    bRemoved=TRUE; 6),VN>j  
    KeyCount--; }@NT#hD  
    break; 707-iLkt.1  
   } <|c[ #f  
  } _%6Vcy  
 } 7?EC kuSv  
 return bRemoved; 0Lki (  
} G8Sx;Xi  
ui4*vjd  
void VerifyWindow() q?2kD"%$  
{ AZ& ]@Ao  
 for(int i=0;i<MAX_KEY;i++){ 4Q5 c'  
  if(hCallWnd!=NULL){ r-IG.ym3  
   if(!IsWindow(hCallWnd)){ &~a/Upz0]_  
    hCallWnd=NULL; /{+77{# Qn  
    HotKey=0; us3fBY'  
    HotKeyMask=0; /%5X:*:H  
    KeyCount--; BHEZ<K[U   
   } /8tF7Mmr  
  } n> O3p ~  
 } *w_f-YoXp  
} *m 9,_~t  
P1Chmg  
BOOL CHookApp::InitInstance() M}*#{UV2  
{ s^Wh!:>r/  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Y~ ( <H e?  
 hins=AfxGetInstanceHandle(); sCw X|  
 InitHotkey(); SwVdo|%.?  
 return CWinApp::InitInstance(); ECF \/12  
} ;^Y]nsd  
 wk (}q  
int CHookApp::ExitInstance() *>f-UNV  
{ y&8kORz;?  
 VerifyWindow(); ]f~mR_E  
 UnInit(); E]26a,^L  
 return CWinApp::ExitInstance(); ~[d|:]  
} FsyM{LT  
8!q$8]M  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file r7=r~3)  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Q'n]+%YN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ H^\2,x Z  
#if _MSC_VER > 1000 Lm}J& ^>  
#pragma once =9@t6   
#endif // _MSC_VER > 1000  >!7\Rx  
9X6l`bo'  
class CCaptureDlg : public CDialog qqR8E&Y{  
{ !1s^TB>N  
 // Construction M7 Z9(3Va  
 public: ywS2` (  
  BOOL bTray; #0wH.\79  
  BOOL bRegistered; d:V6.7>,  
  BOOL RegisterHotkey(); fX[6  {  
  UCHAR cKey; \L@DDK|"`6  
  UCHAR cMask; @<W^/D1#L  
  void DeleteIcon(); _RcFV  
  void AddIcon(); E")g1xGaK  
  UINT nCount; %oY=.Ok ]  
  void SaveBmp(); "\l O1D  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^&mJDRe  
  // Dialog Data erC)2{m  
  //{{AFX_DATA(CCaptureDlg) {zf)im[.  
  enum { IDD = IDD_CAPTURE_DIALOG }; >TqMb8e_  
  CComboBox m_Key; ZC\&n4~7  
  BOOL m_bControl; M XX:i  
  BOOL m_bAlt; ^KeJ=VT  
  BOOL m_bShift; Z[{k-_HgAm  
  CString m_Path; NLLLt  
  CString m_Number; w6 x{ <d  
  //}}AFX_DATA \ &S-lsLY  
  // ClassWizard generated virtual function overrides 6mH --!j  
  //{{AFX_VIRTUAL(CCaptureDlg) ue;o:>G  
 public: J0eJRs  
  virtual BOOL PreTranslateMessage(MSG* pMsg); lwU$*?yv  
 protected: &S8Pnb)d  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ie f~*:5  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); c< P ML|e  
  //}}AFX_VIRTUAL ;HOOo>%_K  
  // Implementation 8.'[>VzBL  
 protected: ?pAO?5Z:}  
  HICON m_hIcon; lW!}OzE(m  
  // Generated message map functions wCwJ#-z.=  
  //{{AFX_MSG(CCaptureDlg) +?!x;qS^  
  virtual BOOL OnInitDialog(); ~fDMzOd  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ]^j'2nJv0  
  afx_msg void OnPaint(); %bp8VR sY  
  afx_msg HCURSOR OnQueryDragIcon(); UY!N"[&  
  virtual void OnCancel(); bJz}\[z  
  afx_msg void OnAbout(); DD4fV`:kG  
  afx_msg void OnBrowse(); u6,NQ^4  
  afx_msg void OnChange(); aq|R?  
 //}}AFX_MSG .=nx5y z  
 DECLARE_MESSAGE_MAP() .[ E"Kb}=  
}; U60jkzIRH  
#endif .[1"3!T  
;0R>Dg  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file _7O;ED+  
#include "stdafx.h" 1%;o-F@  
#include "Capture.h" WI?iz-,](  
#include "CaptureDlg.h" L6xLD X7y  
#include <windowsx.h> \GR M,c  
#pragma comment(lib,"hook.lib") yJheni  
#ifdef _DEBUG Jf/X3\0N7  
#define new DEBUG_NEW qOusO6  
#undef THIS_FILE cNX0.7Ls  
static char THIS_FILE[] = __FILE__; FuiEy=+  
#endif ?3{R'Buv]  
#define IDM_SHELL WM_USER+1 nY#V~^|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *6-fvqCv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Z=B6fu*  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; '%u7XuU-]  
class CAboutDlg : public CDialog ^st.bzg+[  
{ \G3 P[E[  
 public: ,<^7~d{{3m  
  CAboutDlg(); ;Jn"^zT  
  // Dialog Data 1;\A./FVv  
  //{{AFX_DATA(CAboutDlg) M<A*{@4$w&  
  enum { IDD = IDD_ABOUTBOX }; QJcaOXyMS  
  //}}AFX_DATA Y\.d s%G  
  // ClassWizard generated virtual function overrides aX oD{zA  
  //{{AFX_VIRTUAL(CAboutDlg) %7X<:f|N8x  
 protected: =1JS6~CTLN  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 6 N%fJ   
  //}}AFX_VIRTUAL GJUorj&  
  // Implementation Z$0+jpG_s  
 protected: 92@/8,[  
  //{{AFX_MSG(CAboutDlg) P <$)v5f  
  //}}AFX_MSG U5 `h  
  DECLARE_MESSAGE_MAP() Zy}Qc")Z  
}; 8sDbvVh1F  
-:hiLZJ7-  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) !besMZ  
{ U{IY F{;@  
 //{{AFX_DATA_INIT(CAboutDlg) -xJ_5  
 //}}AFX_DATA_INIT *h<= (Y%   
} *4i)aj  
uCc.dluU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) /Hox]r]'e  
{ Qy)+YhE  
 CDialog::DoDataExchange(pDX); DFgr,~  
 //{{AFX_DATA_MAP(CAboutDlg) Yy 4EM  
 //}}AFX_DATA_MAP _RLx;Tn)L  
} )KZ1Z$<  
C~do*rnM^  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) /`M> 3q[  
 //{{AFX_MSG_MAP(CAboutDlg) hK!Z ~  
 // No message handlers $jt  UQ1  
 //}}AFX_MSG_MAP *WSH-*0  
END_MESSAGE_MAP() rAc Yt9M#  
L{v^:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) lpW|GFG  
: CDialog(CCaptureDlg::IDD, pParent) z*Y4t?+  
{ b.qp&2A  
 //{{AFX_DATA_INIT(CCaptureDlg) `w_?9^7mH  
  m_bControl = FALSE; F1V[8I.0  
  m_bAlt = FALSE; ~, hPi  
  m_bShift = FALSE; U Ox$Xwp5&  
  m_Path = _T("c:\\"); |E\0Rv{H3  
  m_Number = _T("0 picture captured."); aR }|^ex  
  nCount=0; _n.2'  
  bRegistered=FALSE; 5K1WfdBX7)  
  bTray=FALSE; L*ZC` .h  
 //}}AFX_DATA_INIT u3!aKXnv<  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oB9t&yM  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); fIrl?X']  
} S ("Zzq`  
.s4hFB^n  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) e*O-LI2O  
{ j8@ Eqh  
 CDialog::DoDataExchange(pDX); Evz;eobW/  
 //{{AFX_DATA_MAP(CCaptureDlg) Qm| Q0u   
  DDX_Control(pDX, IDC_KEY, m_Key); $#4J^(I*:  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); j1!P:(  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Oeo:V"  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `aFy2x`3  
  DDX_Text(pDX, IDC_PATH, m_Path); nZF(92v  
  DDX_Text(pDX, IDC_NUMBER, m_Number); NO4V{}?a  
 //}}AFX_DATA_MAP c#q OK  
} !P7##ho0  
Ol>"'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Te%'9-jk  
//{{AFX_MSG_MAP(CCaptureDlg) =e7,d$i  
 ON_WM_SYSCOMMAND() `{g8A P3  
 ON_WM_PAINT() (fgX!G[W  
 ON_WM_QUERYDRAGICON() BX[92~Bq  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) myT z  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) (wmMHo|  
 ON_BN_CLICKED(ID_CHANGE, OnChange) _=c>>X  
//}}AFX_MSG_MAP a :jRQ-F)  
END_MESSAGE_MAP() iSTr;>A  
e^g3J/aU  
BOOL CCaptureDlg::OnInitDialog() :uZfdu  
{ )hH9VGZq(  
 CDialog::OnInitDialog(); W~GbB:-  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); TlEx w0i!  
 ASSERT(IDM_ABOUTBOX < 0xF000); lAsDdxB`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 'hl>pso.  
 if (pSysMenu != NULL) ; Xy\7tx  
 { s)$N&0\  
  CString strAboutMenu; ]KGLJ~hm>  
  strAboutMenu.LoadString(IDS_ABOUTBOX); X{rw+!  
  if (!strAboutMenu.IsEmpty()) .I{b]6  
  { DpIv <m]  
   pSysMenu->AppendMenu(MF_SEPARATOR); F_ ~L&jHP  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?2VY ^7N[  
  } &x{CC@g/  
 } "|CzQ&e  
 SetIcon(m_hIcon, TRUE); // Set big icon -k{n"9a9?  
 SetIcon(m_hIcon, FALSE); // Set small icon .gNWDk0$Y  
 m_Key.SetCurSel(0); l-"c-2-!  
 RegisterHotkey(); q/xMM `{  
 CMenu* pMenu=GetSystemMenu(FALSE); #LlHsY530N  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); 'iO?M'0gE#  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); r]eeKV,{p  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 3X$)cZQ  
 return TRUE; // return TRUE unless you set the focus to a control @ NGK2J  
} Y) Y`9u<?  
u-Pa:wm0-  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) THirh6  
{ ;crQ7}k  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ud K)F$7  
 { I0 a,mO;m  
  CAboutDlg dlgAbout; #q1Qa_LXc  
  dlgAbout.DoModal(); <v;;:RB6c  
 } FR9<$  
 else I|lz;i}$  
 { &P&LjHFK  
  CDialog::OnSysCommand(nID, lParam); t>|Y-i3cb  
 } /_E8'qlx  
} cZKK\hf<  
brJ _q0@  
void CCaptureDlg::OnPaint() LtKiJ.j?A  
{ b:/;  
 if (IsIconic()) b7g\wnV8z  
 { 3DnlXH(h1  
  CPaintDC dc(this); // device context for painting 3o%,8l,  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 6V\YYrUz  
  // Center icon in client rectangle an^"_#8DA@  
  int cxIcon = GetSystemMetrics(SM_CXICON); 'EJ8)2  
  int cyIcon = GetSystemMetrics(SM_CYICON); Y 3r m')c  
  CRect rect; :G9+-z{Y&  
  GetClientRect(&rect); uZ( I|N$  
  int x = (rect.Width() - cxIcon + 1) / 2; Et ty{r}  
  int y = (rect.Height() - cyIcon + 1) / 2; 'M185wDdAl  
  // Draw the icon ?-0k3  
  dc.DrawIcon(x, y, m_hIcon); -4`Wkkhu  
 } $.kP7!`:,  
 else `E>HpRcxD  
 { 0ZPwEP  
  CDialog::OnPaint(); Pcut#8?  
 } pkpD1c^  
} $u_0"sUV  
| 2BIAm]  
HCURSOR CCaptureDlg::OnQueryDragIcon() &Yi)|TU3'R  
{ $A"kHS7T  
 return (HCURSOR) m_hIcon; .GUm3b  
} ^]w!ow41  
GVk&n"9kp  
void CCaptureDlg::OnCancel() !"/]<OQ   
{ \"B?'Ep;  
 if(bTray) r#iZ FL3q  
  DeleteIcon(); W)3?T& `  
  CDialog::OnCancel(); $E3- </ f  
} 4s nL((  
:b)IDcW&j:  
void CCaptureDlg::OnAbout() 9Z]~c^UB  
{ ^%|,G:r  
 CAboutDlg dlg; e5KsKzu a  
 dlg.DoModal(); zY~  
} rF:C({y  
XlUM~(7+v  
void CCaptureDlg::OnBrowse() Z"PPXv-<jY  
{ :;W[@DeO[  
 CString str; ~$n4Yuu2[  
 BROWSEINFO bi; \7PPFKS  
 char name[MAX_PATH]; y\K r@;q0w  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); r_nB-\  
 bi.hwndOwner=GetSafeHwnd(); -SZXUN  
 bi.pszDisplayName=name; pSp/Qpb-B  
 bi.lpszTitle="Select folder"; a0I+|fR  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; LVKvPi  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); n&ZA rJ  
 if(idl==NULL) Jb~$Vrdy  
  return; rx2?y3pv  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 3/c3e{,!  
 str.ReleaseBuffer(); |{ W4JFKJ  
 m_Path=str; `i5U&K. 7  
 if(str.GetAt(str.GetLength()-1)!='\\') cb!mV5M-g  
  m_Path+="\\"; i!g}PbC[  
 UpdateData(FALSE); Ie{98  
} (5- w>(  
t80s(e  
void CCaptureDlg::SaveBmp() j6v|D>I  
{ ta"uxL\gge  
 CDC dc; x|4m*>Ke  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Q#"p6ZmI  
 CBitmap bm; 0VsQ$4'V^  
 int Width=GetSystemMetrics(SM_CXSCREEN);  gGF]Dq  
 int Height=GetSystemMetrics(SM_CYSCREEN); e ewhT ^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0K/Pth"*  
 CDC tdc; I\ e?v`e  
 tdc.CreateCompatibleDC(&dc); Gl8D GELl;  
 CBitmap*pOld=tdc.SelectObject(&bm); |^fubQs;2  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .{+KKa $@G  
 tdc.SelectObject(pOld); LXYpP- E  
 BITMAP btm; 3m3ljy  
 bm.GetBitmap(&btm); )9/.K'o,dy  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ^u'hl$`^  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); (NfP2E|B  
 BITMAPINFOHEADER bih; j("$qp v  
 bih.biBitCount=btm.bmBitsPixel; PPoQNW  
 bih.biClrImportant=0; +;z^qn  
 bih.biClrUsed=0; 8VG6~>ux'>  
 bih.biCompression=0; 3 #GZ6:rVJ  
 bih.biHeight=btm.bmHeight; =&+]>g{T  
 bih.biPlanes=1; k(hYNmmo j  
 bih.biSize=sizeof(BITMAPINFOHEADER); wq yw#)S  
 bih.biSizeImage=size; u.v 5!G  
 bih.biWidth=btm.bmWidth; 6cR}Mm9Hx3  
 bih.biXPelsPerMeter=0; fP 1V1ao  
 bih.biYPelsPerMeter=0; w2*.3I,~)B  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zED#+-7  
 static int filecount=0; $cl[Qcw  
 CString name; "FuOWI{in  
 name.Format("pict%04d.bmp",filecount++); J%VcvBaJm  
 name=m_Path+name; 8yW8F26  
 BITMAPFILEHEADER bfh; [6 d~q]KH  
 bfh.bfReserved1=bfh.bfReserved2=0; 5zk<s`h  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5\\#kjjx  
 bfh.bfSize=54+size; pypW  
 bfh.bfOffBits=54; i4<&zj})  
 CFile bf; lT.Q)(  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t "y[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); $;O-1# ]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); &[u>^VO8  
  bf.WriteHuge(lpData,size); zk6al$3R  
  bf.Close(); zzlqj){F  
  nCount++; |gXtP-  
 } K4T#8K]aZF  
 GlobalFreePtr(lpData); )-qWcf?   
 if(nCount==1) > L5fc".  
  m_Number.Format("%d picture captured.",nCount); R$>]7-N}  
 else }E o\=>l7  
  m_Number.Format("%d pictures captured.",nCount); 9NUft8QB  
  UpdateData(FALSE); 3C:!\R  
} kXj rc  
NxOiT#YH  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) j[E8C$lW  
{ z-9@K<`H  
 if(pMsg -> message == WM_KEYDOWN)  ywQ>T+  
 { !WTZ =|  
  if(pMsg -> wParam == VK_ESCAPE) A%Ov.~&\G  
   return TRUE; 'eM90I%(  
  if(pMsg -> wParam == VK_RETURN)  (~59}lu~  
   return TRUE; aJ!(c}N~97  
 } =D&xw2  
 return CDialog::PreTranslateMessage(pMsg); 6CQ.>M:R  
} l7{]jKJue  
"hE/f~\  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;HKb  
{ / 7i>0J]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ * ':LBc=%  
  SaveBmp(); /KL;%:7  
  return FALSE; ,]:vk|a#;  
} .,-,@ZK  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ XwZ~pY ~  
 CMenu pop; M-#OPj*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m7dpr$J  
 CMenu*pMenu=pop.GetSubMenu(0); K;n2mXYGM  
 pMenu->SetDefaultItem(ID_EXITICON); ,H_b@$]n8  
 CPoint pt; z XI [f  
 GetCursorPos(&pt); dwH8Zg$B  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); EnM }H9A  
 if(id==ID_EXITICON) Ffv v8x  
  DeleteIcon(); v jTs[eq>  
 else if(id==ID_EXIT) S]Y3nI  
  OnCancel(); Lc&LF*  
 return FALSE; S1Z~-i*w  
} `.MY" g9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 9/8#e+L  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S":55YQev!  
 AddIcon(); a {4Wg:  
 return res; /.knZ_aJ!  
} fbl8:c)I  
]JQ+*ZYUE  
void CCaptureDlg::AddIcon() >A]U.C  
{ $0kuR!U.N  
 NOTIFYICONDATA data; T[ ~8u9/  
 data.cbSize=sizeof(NOTIFYICONDATA); g6s&nH`Z2  
 CString tip; \n&l  
 tip.LoadString(IDS_ICONTIP); sp&s 5aw  
 data.hIcon=GetIcon(0); nV[0O8p2Md  
 data.hWnd=GetSafeHwnd(); A^m]DSFOO  
 strcpy(data.szTip,tip); 31y>/*}  
 data.uCallbackMessage=IDM_SHELL; 8\AyKw  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; +qWrm |O]  
 data.uID=98; (Xak;Xum1  
 Shell_NotifyIcon(NIM_ADD,&data); 1X ?9Ji)h  
 ShowWindow(SW_HIDE); 0h3 -;%  
 bTray=TRUE; _`oP*g =  
} O_E\(So  
/k$H"'`j4  
void CCaptureDlg::DeleteIcon() OI8Hf3d=  
{ +i\ +bR  
 NOTIFYICONDATA data; n#US4&uT4A  
 data.cbSize=sizeof(NOTIFYICONDATA); ;Dw6pmZ  
 data.hWnd=GetSafeHwnd(); LR(Q.x  
 data.uID=98; @W_=Z0]  
 Shell_NotifyIcon(NIM_DELETE,&data); L~Hl?bK  
 ShowWindow(SW_SHOW); >`0l"K<  
 SetForegroundWindow(); tx+KxOt9Y  
 ShowWindow(SW_SHOWNORMAL); EMTAl;P  
 bTray=FALSE; B#A .-nb  
} 9=l6NNe)|  
rfz\DvV d  
void CCaptureDlg::OnChange() _EusY3q  
{ ~!Ar`= [  
 RegisterHotkey(); Au=9<WB%H  
} <[oPh(!V  
Z$X[x7e.  
BOOL CCaptureDlg::RegisterHotkey() . `ND  
{ K1_]ne)  
 UpdateData(); hx5oTJR  
 UCHAR mask=0; ]N& Y25oT5  
 UCHAR key=0; +A!E 6+'  
 if(m_bControl) US.7:S-r"  
  mask|=4; &|'t>-de,  
 if(m_bAlt) q!qOy/}D  
  mask|=2; ,Fv8&tR  
 if(m_bShift) 6m\MYay  
  mask|=1; 4t]YHLBS  
  key=Key_Table[m_Key.GetCurSel()]; C4].egVg  
 if(bRegistered){  gZg5On  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); MjNq8'$"  
  bRegistered=FALSE; +HpPVuV  
 } .boBo$f  
 cMask=mask; `w;8xD(  
 cKey=key; ! D \u2h  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {\ P`-'C  
 return bRegistered; c*@#0B  
} $ Ith8p~  
=.Hq]l6+  
  四、小结 V~~4<?=A  
6F)^8s02h  
  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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