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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: X8R:9q_  
  Di}M\!-[  
  一、实现方法 ]ZW-`UMO  
8Z "f"  
  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: wf\7sz  
7xux%:BN  
#pragma data_seg("shareddata") EgbH{)u  
HHOOK hHook =NULL; //钩子句柄 XJy.xI>;  
UINT nHookCount =0; //挂接的程序数目 nG{o$v_|  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 @0C[o9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @0NWc c+  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey dD~H ft  
static int KeyCount =0; R?2HnJh  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2dHsM'ze  
#pragma data_seg() Dfc% jWbA  
+9pock  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 f4F%\ "  
vifw FPe  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: F;kKn:XL  
'=\>n(%Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rl$"~/ oz  
cKey,UCHAR cMask) +uTl Lu;MT  
{ ;_|4c7  
 BOOL bAdded=FALSE; o`7 Z<HF  
 for(int index=0;index<MAX_KEY;index++){ ]s E)-8  
  if(hCallWnd[index]==0){ j(K)CHH  
   hCallWnd[index]=hWnd; SyT{k\[  
   HotKey[index]=cKey; $/@  L  
   HotKeyMask[index]=cMask; jENC1T(  
   bAdded=TRUE; iVf7;M8O  
   KeyCount++; w:iMrQeJg  
   break; wPu.hVz  
  } \&ZEIAe  
 } Doq}UWp  
 return bAdded; U /~uu  
} nt-_)4Fm  
//删除热键 k'PvQl"I  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 6BEpnw>p(  
{ VlSM/y5  
 BOOL bRemoved=FALSE; )PYh./_2  
 for(int index=0;index<MAX_KEY;index++){ ~ qaT jSP  
  if(hCallWnd[index]==hWnd){ H+]h+K9\7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1LhZmv  
    hCallWnd[index]=NULL; 5JK'2J&  
    HotKey[index]=0; gyV`]uqG  
    HotKeyMask[index]=0; m,62'  
    bRemoved=TRUE; |%fNLUJ)  
    KeyCount--; ["Tro;K#  
    break; bb\XZ~)F  
   } C!9mygI  
  } q #7Nk)<.  
 } /vi Ic %=  
 return bRemoved; &(l.jgqg&  
} o"z;k3(i$7  
O@W/s!&lFa  
+ @|u8+  
  DLL中的钩子函数如下: -"a(<JC^NI  
8t, &dq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1OMaY5F  
{ R^sgafGl=  
 BOOL bProcessed=FALSE; 2EN}"Du]mj  
 if(HC_ACTION==nCode) `.3.n8V  
 { ;L#RFdh  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 v<)&JlR  
   switch(wParam) 9IrCu?n9b  
   {  -MsL>F.]  
    case VK_MENU: Eyk:pnKJb  
     MaskBits&=~ALTBIT; "Ms{c=XPK  
     break; V m8dX?  
    case VK_CONTROL: D+! S\~u  
     MaskBits&=~CTRLBIT; UzIE,A  
     break; .0gfP4{1{  
    case VK_SHIFT: 4KSq]S.  
     MaskBits&=~SHIFTBIT; aaN/HE_  
     break; !+z^VcV  
    default: //judge the key and send message `,/5skeJ  
     break; [q_62[-X  
   } B B'qbX3xK  
   for(int index=0;index<MAX_KEY;index++){ h05FR[</  
    if(hCallWnd[index]==NULL) 61&{I>~1  
     continue; k q?:<!z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (JnEso-V  
    { yD.(j*bMK;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); nR@mm j  
     bProcessed=TRUE; +F-Y^):  
    } k{b|w')  
   } Lp@Al#X55  
  } -r_\=<(  
  else if((lParam&0xc000ffff)==1){ //有键按下 +opym!\  
   switch(wParam) 1|ddG010  
   { FV aC8Kw  
    case VK_MENU: /-^J0f+l3  
     MaskBits|=ALTBIT; Bz>f  
     break; @"/H er  
    case VK_CONTROL: On!+7is'  
     MaskBits|=CTRLBIT; 0:4>rYBC   
     break; jTV4iX  
    case VK_SHIFT: ;pOV; q3j  
     MaskBits|=SHIFTBIT; "-MB U  
     break; 0raFb,6l  
    default: //judge the key and send message SAf)#HXa  
     break; \dE{[^.5  
   } n <> ^cD  
   for(int index=0;index<MAX_KEY;index++){ )8}k.t>'s  
    if(hCallWnd[index]==NULL) 5[)#3vY  
     continue; 9xw"NcL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -wl&~}%M  
    { L ed{#+  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Z(R0IW  
     bProcessed=TRUE; 7 H:y=?X6  
    } ?2,D-3 {  
   } +|pYu<OY  
  } P0hr=/h4  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7,Z<PE  
   for(int index=0;index<MAX_KEY;index++){ w,R6:*p5  
    if(hCallWnd[index]==NULL) #<sK3PT  
     continue; 2|B@s3a  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ev+H{5W8  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); D/4]r@M2c  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 EowzEGq!a5  
   } $XMpC{  
  } >mJ`904L  
 } JTBt=u{6^  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 8==M{M/eM  
} k&f/f  
Fi;OZ>;a  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: {TJBB/B1  
/Qef[$!(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vmh$c*TE  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); I2SH j6 -  
uW#s;1H.)  
  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: e m)%U  
YTY(Et1i  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) $ywROa]  
{ WDV=]D/OE  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) |r)QkxdU,  
 { hmG8 {h/  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 rbIYLVA+V  
  SaveBmp(); |4 2;171  
  return FALSE; (pP.*`JRv  
 } kZrc^  
 …… //其它处理及默认处理 zF{~Md1  
} >BK/HuS  
_FcTY5."S  
aot2F60J,  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 .7LQ l ?  
.\ya  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 EEK!'[<,sE  
birc&<  
  二、编程步骤 xVX:kDX  
^ACrWk~UY  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; S&XlMu  
oz,.gP%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; fR{_P  
*jPd=+d  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; =_m3 ~=Z  
c?}G;$  
  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; K\8zhY  
UpE +WzY  
  5、 添加代码,编译运行程序。 =mPe wx'  
6~2upy~e  
三、程序代码 fc<y(uX  
qnWM  %k  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 6<QC|>p  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) }S?"mg& V  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ :FH&#Eq~4  
#if _MSC_VER > 1000 Umzb  
#pragma once _O'!C!K6  
#endif // _MSC_VER > 1000 +/RR!vG,  
#ifndef __AFXWIN_H__ "M /Cl|z  
#error include 'stdafx.h' before including this file for PCH Rf>)#hn%  
#endif L]!![v.VY  
#include "resource.h" // main symbols 19y,O0# _  
class CHookApp : public CWinApp 8Q)|8xpYS  
{ @H4]Gp ]  
 public: pmWy:0R  
  CHookApp(); |#< z\u }  
  // Overrides 8Yf*vp>T/x  
  // ClassWizard generated virtual function overrides w%iw xo   
  //{{AFX_VIRTUAL(CHookApp) |&W4Dk n  
 public: 'xG J;pY  
  virtual BOOL InitInstance(); b)e;Q5Z(.  
  virtual int ExitInstance(); .s,04xW\  
  //}}AFX_VIRTUAL 5XB]p|YU~s  
  //{{AFX_MSG(CHookApp) QKq4kAaJ!  
  // NOTE - the ClassWizard will add and remove member functions here. FJCORa@?_  
  // DO NOT EDIT what you see in these blocks of generated code ! YG:^gi  
  //}}AFX_MSG 8IxIW0  
  DECLARE_MESSAGE_MAP() 6B7*|R>  
}; <Lxp t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); !uIY,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  4uMMf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  ,Zb  
BOOL InitHotkey(); w2XHY>6];  
BOOL UnInit(); Kb{&a  
#endif s5mJ -  
;]m;p,$  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. m;{HlDez  
#include "stdafx.h" ^gp]tAf  
#include "hook.h" \7*|u  
#include <windowsx.h> ]a&riPh"  
#ifdef _DEBUG |gu@b~8  
#define new DEBUG_NEW w@Q~ax/  
#undef THIS_FILE e Ru5/y~  
static char THIS_FILE[] = __FILE__; 41Q)w=hoN  
#endif 26k~Z}  
#define MAX_KEY 100 S hy.:XI  
#define CTRLBIT 0x04 w+*rbJ  
#define ALTBIT 0x02 6|f8DX%3V  
#define SHIFTBIT 0x01 Q%?%zuU  
#pragma data_seg("shareddata") !^98o:"x  
HHOOK hHook =NULL; IZLCwaW  
UINT nHookCount =0; *aWh]x9TlU  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey >yP> ]r+  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT >yn]h4M  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey p=> +3  
static int KeyCount =0; 0n`Temb/  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift G;u~H<  
#pragma data_seg() 7_qsVhh]$E  
HINSTANCE hins; ',WJ'g  
void VerifyWindow(); CL7 /J[TS  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @}!?}QU  
//{{AFX_MSG_MAP(CHookApp) m,q)lbRl  
// NOTE - the ClassWizard will add and remove mapping macros here. I{U|'a  
// DO NOT EDIT what you see in these blocks of generated code! w_@{v wM$A  
//}}AFX_MSG_MAP Ax~ i`  
END_MESSAGE_MAP() Et-|[ eL  
aBY&]6^-  
CHookApp::CHookApp() mr G?5.7W  
{ AI{0;0  
 // TODO: add construction code here, 1pDU}rPJ.  
 // Place all significant initialization in InitInstance *dBmb  
} <zvtQ^{]  
s91[DT4  
CHookApp theApp; v< 2,OcH  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) \eQPv kx2  
{ 9IG<9uj  
 BOOL bProcessed=FALSE; o_Y?s+~i[/  
 if(HC_ACTION==nCode) #Y-_kQV*  
 { AT3HH QD  
  if((lParam&0xc0000000)==0xc0000000){// Key up dJ])`S  
   switch(wParam) U*sQ5uq  
   { <im}R9eJ1  
    case VK_MENU: L1Yj9i  
     MaskBits&=~ALTBIT; lnjs{`^  
     break; eS ?9}TG|  
    case VK_CONTROL: F 8sOc&L  
     MaskBits&=~CTRLBIT; u R5h0Fi  
     break; }u0&>k|y  
    case VK_SHIFT: q^wSM  
     MaskBits&=~SHIFTBIT; gjnEN1T22  
     break; 4Jc~I  
    default: //judge the key and send message KOXG=P0  
     break; pMViq0  
   } 4%_c9nat  
   for(int index=0;index<MAX_KEY;index++){ RX?!MDO  
    if(hCallWnd[index]==NULL) |G6'GTwZD  
     continue; y,n.(?!*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -p7 HQ/  
    { p*YV*Arv  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 46\!W(O~y  
     bProcessed=TRUE; :cXN Fu\C  
    } zn^ G V  
   } =<aFkBX-  
  } ZDI?"dt{  
  else if((lParam&0xc000ffff)==1){ //Key down |<oqT+?i  
   switch(wParam) V7gL*,3>=  
   { d >zC[]1  
    case VK_MENU: awz.~c++  
     MaskBits|=ALTBIT; p*@t$0i  
     break; ScVbo3{m*T  
    case VK_CONTROL: \{a5]G(4s  
     MaskBits|=CTRLBIT; +`B^D  
     break; &><b/,]  
    case VK_SHIFT: PGYx] r  
     MaskBits|=SHIFTBIT; 1LvR,V<  
     break; zO$r   
    default: //judge the key and send message L|-|DOgw  
     break; q?]KZ_a  
   } (47la$CR  
   for(int index=0;index<MAX_KEY;index++) 8o $ ` '  
   { Tl]yl$  
    if(hCallWnd[index]==NULL) ;Kg7}4`I  
     continue; tBl (E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) uocFOlU0n  
    { f$dIPt(  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); CMv8n@ry  
     bProcessed=TRUE; N$:-q'hX  
    } Q:y'G9b  
   } Y;g\ @j  
  } Wy/h"R\=  
  if(!bProcessed){ dShGIH?  
   for(int index=0;index<MAX_KEY;index++){ Q6 m.yds  
    if(hCallWnd[index]==NULL) ;AL:V U  
     continue; A =&`TfXu  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Vr %ef:uVV  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {9XNh[NbP  
   } %CgV:.,K  
  } ,zK E$  
 } jPx}-_jM  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); em- <V5fb  
} :B7U),T  
Z^_zcH'  
BOOL InitHotkey() 37jrWe6xwp  
{ p_EM/jI,  
 if(hHook!=NULL){  |*-<G3@  
  nHookCount++; 0B}2~}#  
  return TRUE; I-Ut7W  
 } "oF)u1_?  
 else YGc:84S  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [U"/A1p  
  if(hHook!=NULL) cJTwgm?  
   nHookCount++; DpT$19Q+  
  return (hHook!=NULL); ^7=7V0>,:  
} \W= qqE]  
BOOL UnInit() fd>&RbUp  
{ )t\aB_ =  
 if(nHookCount>1){ QH,(iX6RY  
  nHookCount--; 5nsoWqnE8  
  return TRUE; %so{'rQl  
 } S QGYH  
 BOOL unhooked = UnhookWindowsHookEx(hHook); r}D#(G$  
 if(unhooked==TRUE){ SR?(z  
  nHookCount=0; 3 5L0 CM  
  hHook=NULL; %*Uc,V  
 } hv\Dz*XTs0  
 return unhooked; )E^4U 9v),  
} Cz9MXb]B  
_u~0t`f~  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) DGS,iRLnA  
{ ReA-.j_2@  
 BOOL bAdded=FALSE; C4|OsC7J  
 for(int index=0;index<MAX_KEY;index++){ 6qT-  
  if(hCallWnd[index]==0){ x',6VTz^  
   hCallWnd[index]=hWnd; pv-c>8Wb6  
   HotKey[index]=cKey; S'hUh'PZ  
   HotKeyMask[index]=cMask; j|!t3}((  
   bAdded=TRUE; f:J-X~T_f  
   KeyCount++; wEJzLFCn  
   break; O7uCTB+  
  } n&?)gKL0g  
 } ;YW@ 3F-h  
 return bAdded; WjM7s]ZRv  
} j:/Z_v'  
MxKTKBxQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [ K'gvLt1  
{ ;^E_BJm  
 BOOL bRemoved=FALSE; PiCGZybCA  
 for(int index=0;index<MAX_KEY;index++){ aJA(UN45  
  if(hCallWnd[index]==hWnd){ }<l:~-y|  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ +{I" e,Nk  
    hCallWnd[index]=NULL; h8(>$A-  
    HotKey[index]=0; e t@:-}  
    HotKeyMask[index]=0; 0 _MtmmL.  
    bRemoved=TRUE; J|%bRLX@>  
    KeyCount--; R*6B@<p,i  
    break; B.~] 7H5"(  
   } Qx8(w"k*  
  } V %D1Q}X  
 }  [)~1Lu  
 return bRemoved; TO"Md["GI  
} 6yMZ2%  
~ A=Gra  
void VerifyWindow() 7Zd g314  
{ U,;796h  
 for(int i=0;i<MAX_KEY;i++){ n_9Ex&?e  
  if(hCallWnd!=NULL){ k{N!}%*2  
   if(!IsWindow(hCallWnd)){ LyWY\K a  
    hCallWnd=NULL; v:yU+s|kN  
    HotKey=0; dIYf}7P  
    HotKeyMask=0; _6ck@  
    KeyCount--; ~ &Ne P  
   } HK~SD:d  
  } 3,6f}:CG  
 } Fs%`W4/  
} Xo/H+[;X  
[YHtBM:y  
BOOL CHookApp::InitInstance() ]77f`<q<}!  
{ :/$WeAg  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); JcmJq fR  
 hins=AfxGetInstanceHandle(); 9 i/ (  
 InitHotkey(); }l[e@6r F  
 return CWinApp::InitInstance(); jHn7H)F8  
} js5VgP`  
4_ U"M@  
int CHookApp::ExitInstance() PS+~JwDUc  
{ w]{c*4o  
 VerifyWindow(); S_Wq`I@b  
 UnInit(); :=ek~s.UV  
 return CWinApp::ExitInstance(); 4^bt~{}  
} Bps%>P~.  
:;]9,n  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Q+9:]Bt  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 2[qfF6FHA  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ prz COw  
#if _MSC_VER > 1000 3-{BXht)  
#pragma once -kMw[Y  
#endif // _MSC_VER > 1000 aXJ/"k #Tl  
?<C(ga  
class CCaptureDlg : public CDialog |`#fX(=  
{ ~a`[p\  
 // Construction v>B412l  
 public: kF~(B]W(  
  BOOL bTray; <;PKec  
  BOOL bRegistered; cVL|kYVWT  
  BOOL RegisterHotkey(); }" vxYB!h3  
  UCHAR cKey; /u4RZ|&as  
  UCHAR cMask; g}D)MlXRq  
  void DeleteIcon(); ^?+[yvq  
  void AddIcon(); `HXv_9  
  UINT nCount; /#M1J:SV  
  void SaveBmp(); yef\Y3X  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v4"Ukv  
  // Dialog Data yT@Aj;X0v  
  //{{AFX_DATA(CCaptureDlg) EpMxq7*  
  enum { IDD = IDD_CAPTURE_DIALOG }; pS ](Emn`.  
  CComboBox m_Key; VbvP!<8  
  BOOL m_bControl; S=!WFKcJR  
  BOOL m_bAlt; N knS:r&2  
  BOOL m_bShift; y&,|+h  
  CString m_Path; O?Bf (y  
  CString m_Number; {k_\1t(/  
  //}}AFX_DATA j}ob7O&U'w  
  // ClassWizard generated virtual function overrides hFi gY\$m  
  //{{AFX_VIRTUAL(CCaptureDlg) 6-_g1vq  
 public: JVX)>2&$  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ` 5Kg[nB:  
 protected: OA&'T*)-A6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support CsA(oX  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =eU=\td^  
  //}}AFX_VIRTUAL ))|d~m  
  // Implementation /f1]U LmC:  
 protected: vF$( Y/  
  HICON m_hIcon; m1pA]}Y/5o  
  // Generated message map functions {wz)^A sy  
  //{{AFX_MSG(CCaptureDlg) &S{r;N5u  
  virtual BOOL OnInitDialog(); Unb2D4&'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); wG[n wt0L  
  afx_msg void OnPaint(); ;m7G8)I  
  afx_msg HCURSOR OnQueryDragIcon(); qhGz2<}_j  
  virtual void OnCancel(); I2$DlEke  
  afx_msg void OnAbout(); Ow/,pC >V  
  afx_msg void OnBrowse(); .8|wc  
  afx_msg void OnChange(); KBB)xez8  
 //}}AFX_MSG @@o J@;  
 DECLARE_MESSAGE_MAP() x*vD^1"'P  
}; &<e18L 7a  
#endif PG63{  
Q&]|W Xv  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file nKm# kb  
#include "stdafx.h" 7?whxi Qs  
#include "Capture.h" )&1v[]%S  
#include "CaptureDlg.h" =l43RawAmu  
#include <windowsx.h> #4bT8kq  
#pragma comment(lib,"hook.lib") ) 1AAL0F\B  
#ifdef _DEBUG 2]mV9B   
#define new DEBUG_NEW BwWSztJ+B  
#undef THIS_FILE 6AJk6 W^Z  
static char THIS_FILE[] = __FILE__; wI|h9q1U  
#endif .b]s Q'  
#define IDM_SHELL WM_USER+1 JI .=y5I  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q<V(#)*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (s;W>,~q  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; vWoppt  
class CAboutDlg : public CDialog d78 [(;  
{ ^ 0YQlT98  
 public: -rsbSt ?_  
  CAboutDlg(); wmGcXBHt$  
  // Dialog Data lk 1\|Q I  
  //{{AFX_DATA(CAboutDlg) We{@0K/O  
  enum { IDD = IDD_ABOUTBOX }; (U&  
  //}}AFX_DATA (-WRZLOQ  
  // ClassWizard generated virtual function overrides P5?VrZy  
  //{{AFX_VIRTUAL(CAboutDlg) z+yq%O  
 protected: %!nI]|  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support v`,!wS  
  //}}AFX_VIRTUAL %N-aLw\  
  // Implementation ?{ExBZNa  
 protected: )9`HO?   
  //{{AFX_MSG(CAboutDlg) Dq<la+VlO  
  //}}AFX_MSG g{DehBM  
  DECLARE_MESSAGE_MAP() X~jdOaq{F:  
}; %FYhq:j  
*eoH"UFYQ#  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) U}jGr=tu  
{ 3l<qcKKc  
 //{{AFX_DATA_INIT(CAboutDlg) |` :cB  
 //}}AFX_DATA_INIT >Y08/OAI.2  
} E'a OHSAg  
L4Jm8sy{  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Ts !g=F  
{ @~$d4K y<  
 CDialog::DoDataExchange(pDX); Nb$0pc1J<  
 //{{AFX_DATA_MAP(CAboutDlg) A6=Z2i0w>X  
 //}}AFX_DATA_MAP "BSY1?k{  
} our ^J8  
Cw(e7K7&  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8s6[-F5  
 //{{AFX_MSG_MAP(CAboutDlg) ,pD sU@  
 // No message handlers 0E26J@jcZ7  
 //}}AFX_MSG_MAP >;4q  
END_MESSAGE_MAP() &b#d4p6&l  
U*a#{C7"  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) <=n;5hv:  
: CDialog(CCaptureDlg::IDD, pParent) jz<}9Kze  
{ tAN!LI+w  
 //{{AFX_DATA_INIT(CCaptureDlg) }oZ8esZU2  
  m_bControl = FALSE; 4nm.ea|  
  m_bAlt = FALSE; +zMhA p  
  m_bShift = FALSE; |/K| Vwa  
  m_Path = _T("c:\\"); + -Rf@  
  m_Number = _T("0 picture captured."); *}89.kCBF  
  nCount=0; %J1'>nI!q  
  bRegistered=FALSE; YxM\qy {Vr  
  bTray=FALSE; ^)9/Wz _x  
 //}}AFX_DATA_INIT ywp_,j9F  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 nqH[ y0  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Oz%6y ri  
} }SWfP5D@  
01@ WU1IN  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %EU_OS(u.{  
{ >!1] G"U  
 CDialog::DoDataExchange(pDX); FBl,Mky  
 //{{AFX_DATA_MAP(CCaptureDlg) ,mm97I  
  DDX_Control(pDX, IDC_KEY, m_Key); "m^gCN}c  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4S'e>:  
  DDX_Check(pDX, IDC_ALT, m_bAlt); M%_*vD  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); XcoX8R%U  
  DDX_Text(pDX, IDC_PATH, m_Path); oA5Qk3b:  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Cl3vp_  
 //}}AFX_DATA_MAP Vw w 211  
} vx?KenO}  
Jy:*GW6  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) KOe]JDU  
//{{AFX_MSG_MAP(CCaptureDlg) "*#f^/LS  
 ON_WM_SYSCOMMAND() SHYekX  
 ON_WM_PAINT() D-@6 hWh~  
 ON_WM_QUERYDRAGICON() !7\dr )  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ?:/J8s [O  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) e*'bY;8lo  
 ON_BN_CLICKED(ID_CHANGE, OnChange) pHR`%2!"t  
//}}AFX_MSG_MAP 7a9">:~  
END_MESSAGE_MAP() &c-V QP(  
,9G'1%z,  
BOOL CCaptureDlg::OnInitDialog() `Zuo`GP*1  
{ \ &|xMw[  
 CDialog::OnInitDialog(); 4}D&=0IZ  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !Dc?9W!b  
 ASSERT(IDM_ABOUTBOX < 0xF000); J37vA zK%  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ]u|FcwWc3  
 if (pSysMenu != NULL) W\B@0Iso  
 { 0*]0#2Z  
  CString strAboutMenu; $o+@}B0)  
  strAboutMenu.LoadString(IDS_ABOUTBOX); LT{g^g  
  if (!strAboutMenu.IsEmpty()) axnVAh|}S  
  { "T /$K  
   pSysMenu->AppendMenu(MF_SEPARATOR); J" ,Cwk\  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )X#$G?|Hn  
  } Z-t qSw8n  
 } sifjmNP  
 SetIcon(m_hIcon, TRUE); // Set big icon $R ze[3  
 SetIcon(m_hIcon, FALSE); // Set small icon :Hitx  
 m_Key.SetCurSel(0); SKf;Fe  
 RegisterHotkey(); 6@0? ~  
 CMenu* pMenu=GetSystemMenu(FALSE); &:d`Pik6  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); clqFV   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); b6e 2a/x  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ii`,cJl  
 return TRUE; // return TRUE unless you set the focus to a control }6u}?>S  
} M Ir[_  
M| }?5NS  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) uuHs)  
{ H RahBTd(z  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }}Q h_(  
 { p&(z'd  
  CAboutDlg dlgAbout; \K2S.j  
  dlgAbout.DoModal(); %j2:W\g:  
 } N["M "s(N  
 else \o,et9zDJ3  
 { 3KD:JKn^  
  CDialog::OnSysCommand(nID, lParam); Rwj 3o  
 } T;kh+ i  
} =*(_sW6;  
5#_GuL%  
void CCaptureDlg::OnPaint() sAX4giaLD  
{ bneP>Bd  
 if (IsIconic()) 2sBYy 8.r  
 { *Q -uE  
  CPaintDC dc(this); // device context for painting r,,*kE  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jxw8jo06:  
  // Center icon in client rectangle l0!`>Xx[b  
  int cxIcon = GetSystemMetrics(SM_CXICON); F%ukT6xp  
  int cyIcon = GetSystemMetrics(SM_CYICON); v{SYz<(  
  CRect rect; 'Um\m  
  GetClientRect(&rect); U&+lw=  
  int x = (rect.Width() - cxIcon + 1) / 2; p)7U%NMc(*  
  int y = (rect.Height() - cyIcon + 1) / 2; d8jP@>  
  // Draw the icon oXwcil  
  dc.DrawIcon(x, y, m_hIcon); g{?{N  
 } sBN4:8  
 else >tkU+$;-  
 { Qmv8T ^+  
  CDialog::OnPaint(); zW95qxXg  
 } OYfP!,+bn  
} L~M6 ca"  
=5p?4/4 J  
HCURSOR CCaptureDlg::OnQueryDragIcon() P^/e!%UgC  
{ scEE$:  
 return (HCURSOR) m_hIcon; 5)K?:7  
} #0M,g  
}PzYt~Z`@  
void CCaptureDlg::OnCancel() 4mWT"T-8  
{ "OKsl2e  
 if(bTray) -QydUr/(o  
  DeleteIcon(); 74Il]i1=  
  CDialog::OnCancel(); 03y5$kQ  
} m}-~VYDj  
(XA]k%45  
void CCaptureDlg::OnAbout() [~rBnzb  
{ wW;!L =j  
 CAboutDlg dlg; jDM^e4U.l  
 dlg.DoModal(); SJI+$L\'  
} 5zI I4ukn*  
 ^pZ\:  
void CCaptureDlg::OnBrowse() `ZAGseDd~  
{ 0 Pa\:^/6  
 CString str; .zyi'Kj  
 BROWSEINFO bi; >RT02Ey>  
 char name[MAX_PATH]; yu62$ d  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); }3mIj<I1;  
 bi.hwndOwner=GetSafeHwnd(); :~]ha  
 bi.pszDisplayName=name; s@bo df&  
 bi.lpszTitle="Select folder"; ijWn,bj  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [VwoZX:  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); owc#RW9 7  
 if(idl==NULL) x k5Z&z  
  return; CVBy&o"6A  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); H23-%+*J  
 str.ReleaseBuffer(); $nbZ+~49  
 m_Path=str; O>`DR0  
 if(str.GetAt(str.GetLength()-1)!='\\') 9y"*H2$#  
  m_Path+="\\"; !pLQRnI}6  
 UpdateData(FALSE); U_c.Z{lC4  
} '|i<?]U  
hpJi,4r.d  
void CCaptureDlg::SaveBmp() { wx!~K  
{ E7qk>~Dg  
 CDC dc; _(s|@UT#  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); aE( j_`L78  
 CBitmap bm; %<w)#eV?  
 int Width=GetSystemMetrics(SM_CXSCREEN); bR!*z  
 int Height=GetSystemMetrics(SM_CYSCREEN); vHPp$lql  
 bm.CreateCompatibleBitmap(&dc,Width,Height); AA$-Lx(UJk  
 CDC tdc; 7Z/KXc[b  
 tdc.CreateCompatibleDC(&dc); o4CgtqRs  
 CBitmap*pOld=tdc.SelectObject(&bm); ;'r} D!8w/  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); D?3^>h  
 tdc.SelectObject(pOld); Zg/ra1n  
 BITMAP btm; "?GA}e"R  
 bm.GetBitmap(&btm); 4b B)t#  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 0XBv8fg  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 195m0'zda  
 BITMAPINFOHEADER bih; %P2GQS-N  
 bih.biBitCount=btm.bmBitsPixel; g9`z]qGWS:  
 bih.biClrImportant=0; /8i3I5*  
 bih.biClrUsed=0; X rVF %  
 bih.biCompression=0; WBgS9qiB  
 bih.biHeight=btm.bmHeight; -Fe) )Y'=  
 bih.biPlanes=1; #?Z>o16,u  
 bih.biSize=sizeof(BITMAPINFOHEADER); r_f?H@v  
 bih.biSizeImage=size; ShdE!q7  
 bih.biWidth=btm.bmWidth; _>8ZL)NQQ  
 bih.biXPelsPerMeter=0; MV<2x7S  
 bih.biYPelsPerMeter=0; FDA``H~  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Pvq74?an`  
 static int filecount=0; Fcc\hV;  
 CString name; ruG5~dm>  
 name.Format("pict%04d.bmp",filecount++); =G%k|  
 name=m_Path+name; 'Tn i;  
 BITMAPFILEHEADER bfh; -rSp gk0wL  
 bfh.bfReserved1=bfh.bfReserved2=0; /d*0+m8  
 bfh.bfType=((WORD)('M'<< 8)|'B'); VFj}{Y  
 bfh.bfSize=54+size; k[0Gz  
 bfh.bfOffBits=54; x t7ZrT  
 CFile bf; \YE(E04w57  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ~.?,*q7  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Wp" +\{@)  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); :d v{'O  
  bf.WriteHuge(lpData,size); "NY[&S  
  bf.Close(); {2EIvKu3:  
  nCount++; X!,2/WT  
 } ;by` [)  
 GlobalFreePtr(lpData); ,iKL 68  
 if(nCount==1) ' XJ>;",[  
  m_Number.Format("%d picture captured.",nCount); 3":vjDq$  
 else }&+b\RE  
  m_Number.Format("%d pictures captured.",nCount); a\60QlAk~  
  UpdateData(FALSE); 'O%itCy)  
} KTr7z^  
)YE3n-~7{  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) F<K;tt  
{ ,@mr})s  
 if(pMsg -> message == WM_KEYDOWN) % ~eIx=s  
 { =P}ob eY  
  if(pMsg -> wParam == VK_ESCAPE) WrB:)Q(8=  
   return TRUE; CatbEXO  
  if(pMsg -> wParam == VK_RETURN) J:<mq5[  
   return TRUE; cZB?_[Cp  
 } dux.Z9X?  
 return CDialog::PreTranslateMessage(pMsg); |$*1!pL-QP  
} 5G$N  
<$6r1y*G  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) zl?Gd4  
{ |\/`YRg>  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ w; [ndZCY7  
  SaveBmp(); Q&j-a;L  
  return FALSE; `1}WQS  
} #m x4pf{  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ :G3PdQb^  
 CMenu pop; &8p]yo2zO  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); '%Cc!63t*  
 CMenu*pMenu=pop.GetSubMenu(0); LqNt.d @  
 pMenu->SetDefaultItem(ID_EXITICON); Yatd$`,hW  
 CPoint pt; dY=]ES} `  
 GetCursorPos(&pt); /\L-y,>X  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \9 ,a"g  
 if(id==ID_EXITICON) 3jSt&+  
  DeleteIcon(); 73Zx`00  
 else if(id==ID_EXIT) 5;WESk  
  OnCancel(); w)C/EHF  
 return FALSE; ~Up5+7k@  
} {5 V@O_*{  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2VpKG*!\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) #:B14E  
 AddIcon(); Dq07Z^#'  
 return res; 77 g<`}{  
} VQ}N& H)`  
\#50; 8VJ  
void CCaptureDlg::AddIcon() FIMM\W  
{ RSfB9)3D  
 NOTIFYICONDATA data; ;$nCQ/ /  
 data.cbSize=sizeof(NOTIFYICONDATA); ;H' ,PjU  
 CString tip; 7)RDu,fx  
 tip.LoadString(IDS_ICONTIP); ~ 3!yd0 [k  
 data.hIcon=GetIcon(0); #%9t-  
 data.hWnd=GetSafeHwnd(); WswM5RN  
 strcpy(data.szTip,tip); ^X]rFY1  
 data.uCallbackMessage=IDM_SHELL; As{Q9o5j/  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; PF+F^;C  
 data.uID=98; 7MbV|gM}  
 Shell_NotifyIcon(NIM_ADD,&data); 3<XP/c";  
 ShowWindow(SW_HIDE); AU$<W"%R  
 bTray=TRUE; XWq`MwC9  
} t6q7 w  
5'<J@3B  
void CCaptureDlg::DeleteIcon() ;No i H&  
{ /wi*OZ7R  
 NOTIFYICONDATA data; _^Z v[P  
 data.cbSize=sizeof(NOTIFYICONDATA); 1La?x'{2MP  
 data.hWnd=GetSafeHwnd(); w,T-vf  
 data.uID=98; xe4`D>LUo  
 Shell_NotifyIcon(NIM_DELETE,&data); 8l>7=~Egp  
 ShowWindow(SW_SHOW); d53Eu`QW?  
 SetForegroundWindow(); Vg^yjP{sv  
 ShowWindow(SW_SHOWNORMAL); )H1\4LeP  
 bTray=FALSE; `_iK`^(-  
} 01n7ua*XX  
]\1H=g%Ou  
void CCaptureDlg::OnChange() iBPIj;,  
{ Z!+n/ D-1  
 RegisterHotkey(); 2RU/oqmR  
} 5(>ux@[qI:  
:u,Ji9 u  
BOOL CCaptureDlg::RegisterHotkey() V8O-|7H$ v  
{ :IX_|8e ^  
 UpdateData(); m0i,Zw{eM  
 UCHAR mask=0; D!DL6l`  
 UCHAR key=0; X Z=%XB:?  
 if(m_bControl) *kt|CXxAS8  
  mask|=4; \"a~~Koe  
 if(m_bAlt) w5+(A_  
  mask|=2; QQ/9ZI5  
 if(m_bShift) cK-jN9U  
  mask|=1; Bdcs}Ga  
  key=Key_Table[m_Key.GetCurSel()]; ctoh&5%!n+  
 if(bRegistered){ d" =)=hm!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); '5lwlF  
  bRegistered=FALSE; ^v&"{2  
 } GP(nb,  
 cMask=mask; v*kX?J#]5  
 cKey=key; s$ kvLy<  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); O!'gylj/  
 return bRegistered; @8Cja.H  
} 8{ +KNqz  
)43z(:<  
  四、小结 x9o(q`N  
v"*c\,  
  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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