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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|R_xY#  
  R`1$z8$  
  一、实现方法 P]6pPS  
c$e~O-OVD?  
  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: =WO{h48]  
xHD!8 B)  
#pragma data_seg("shareddata") 3J(STIxg  
HHOOK hHook =NULL; //钩子句柄 kY_UY~E  
UINT nHookCount =0; //挂接的程序数目 qZ1fQN1yG  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 9 z3Iwl  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 j<l>+., U  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey E>4 \9  
static int KeyCount =0; NoKYHN^*w  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 Pyyx/u+?@  
#pragma data_seg() brTB /(E  
7XR[`Tn9<  
  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。 P `2Rte6s  
IloHU6h'  
  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: %H}+'.8  
!0fK*qIL  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR rzl2Oj"4  
cKey,UCHAR cMask) rtzxMCSEU  
{ Q'A->I<;_s  
 BOOL bAdded=FALSE; (1Kh9w:^"  
 for(int index=0;index<MAX_KEY;index++){ M2oKLRt)L  
  if(hCallWnd[index]==0){ V).M\  
   hCallWnd[index]=hWnd; .pdgRjlSn  
   HotKey[index]=cKey; Nm; ka&'  
   HotKeyMask[index]=cMask; Q2fa]*Z5  
   bAdded=TRUE; {?m',sG;&  
   KeyCount++; 5@v!wms  
   break; *S=v1 s/  
  } }'@*Olj  
 } DD~8:\QD  
 return bAdded; el[6E0!@  
} w\@Anwj#L  
//删除热键 nZ%<2  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $}\. )^[}  
{ 0e}L Z,9e  
 BOOL bRemoved=FALSE; kXOlZ C  
 for(int index=0;index<MAX_KEY;index++){ D!@c,H  
  if(hCallWnd[index]==hWnd){ ?ii a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ S8]g'!  
    hCallWnd[index]=NULL; :^ cA\2=  
    HotKey[index]=0; %*s[s0$c  
    HotKeyMask[index]=0; "arbUX~d  
    bRemoved=TRUE; gqC:r,a  
    KeyCount--; `q5*VqIhs  
    break; HX=`kkX  
   } *sw$OnVb  
  } >G-D& A+  
 } W5yqnjK $4  
 return bRemoved; Fh?q;oEj  
} YE^|G,]  
Ybok[5  
^(6.M\Q  
  DLL中的钩子函数如下: ml3]CcKn  
/#Xz+#SqY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9wI1/>  
{ =XWi+')  
 BOOL bProcessed=FALSE; =nY*,Xu<  
 if(HC_ACTION==nCode) YHAy+S  
 { `GSfA0?  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /sYD+*a  
   switch(wParam) a2g15;kM  
   {  ey Cg *  
    case VK_MENU: F5*Xx g}N  
     MaskBits&=~ALTBIT; M"V?fn'  
     break; E8V,".!+E  
    case VK_CONTROL: g!K(xh EO  
     MaskBits&=~CTRLBIT; 9pk<=F  
     break; Z&21gN  
    case VK_SHIFT: 0&w.QoZY(  
     MaskBits&=~SHIFTBIT; R_ Z H+@O  
     break; #nu?b?X'  
    default: //judge the key and send message C"YM"9JSJ  
     break; 2pB@qi-]  
   } mk0rAN  
   for(int index=0;index<MAX_KEY;index++){ e <IT2tv>u  
    if(hCallWnd[index]==NULL) -ff*,b$Q/  
     continue; #PFf`7b,z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U`:$1*(`  
    { ?p}m[9@  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); X#p E!mT  
     bProcessed=TRUE; OP>'<FK   
    } tt`b+NOH>  
   } m"xw5aa>  
  } Z$+0gm\Cnw  
  else if((lParam&0xc000ffff)==1){ //有键按下 WAob"`8]  
   switch(wParam) N]5-#  
   { !rwv~9I  
    case VK_MENU: //AS44^IS  
     MaskBits|=ALTBIT; QRa>W/N  
     break; !qy/'v4  
    case VK_CONTROL: 7 bpV=  
     MaskBits|=CTRLBIT; :.Np7[~{  
     break; G-T:7  
    case VK_SHIFT: ,!Q2^R   
     MaskBits|=SHIFTBIT; CM~)\prks  
     break; B'&%EW]  
    default: //judge the key and send message Cj ykM])  
     break; [S*bN!t  
   } d7l0;yR&+  
   for(int index=0;index<MAX_KEY;index++){ PiM@iS  
    if(hCallWnd[index]==NULL) r0hu?3u1?  
     continue; xy[R9_V  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) F7L+bv   
    { 4egq Y0A  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); & XcY|y=W  
     bProcessed=TRUE; #:2 36^xYS  
    } sH#UM(N  
   } _ea!psA0  
  } +Pn+&o;D  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 )Ibp%'H  
   for(int index=0;index<MAX_KEY;index++){ EAx@a%  
    if(hCallWnd[index]==NULL) 1'Kn:I  
     continue; A<AZs~f  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Cg-khRgLS  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {aAA4.j^  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !7Ta Vx}`(  
   } elw<(<u`  
  } Z9TG/C,eo  
 } YB~}!F [(  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "{j4?3f)  
} +P81&CaY  
9 }jF]P*Q  
  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: Z$~Wr3/  
K1]H~'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); k*[["u^u]  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Kbrb;r59  
O| ) [j@7  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: VW$Hzx_z  
+r"{$'{^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6/Q'o5>NL:  
{ pMKnA. |  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^ ,d!K2`  
 { 8dNwi&4  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 V31<~&O~%  
  SaveBmp(); kR3g,P{L  
  return FALSE; |Xlpgdiu  
 } 4(f[Z9 iZ]  
 …… //其它处理及默认处理 db'Jl^  
} Zchs/C 9{  
M6[&od  
&2d^=fih  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 K}L-$B*i  
bb`GV  
  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。 {.K >9#^m  
'C)`j{CS  
  二、编程步骤 W MU9tq[  
)xy1 DA  
  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"; hjtkq .@  
#qtAFIm'  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; a4Qr\"Qm  
]<V[H  
  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; ~D PjTR  
yO; r]`j0  
  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; {m.l{<H  
$h"tg9L^)  
  5、 添加代码,编译运行程序。 ?~Fk_#jz,@  
6-c3v  
三、程序代码 :GBWQXb G  
3&^4%S{/  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL , `ST Va-  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) *BF5B\[r?  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ uQ=p } w  
#if _MSC_VER > 1000 dgh )Rfp3  
#pragma once y1GVno  
#endif // _MSC_VER > 1000 M{<cqxY  
#ifndef __AFXWIN_H__ BqC!78Y/e  
#error include 'stdafx.h' before including this file for PCH w]J9Kv1)-  
#endif GsA/pXx  
#include "resource.h" // main symbols XCc /\  
class CHookApp : public CWinApp nlOM4fJ(  
{ 1JM EniB+9  
 public: p%pM3<p  
  CHookApp(); 8D@H4O.  
  // Overrides q\cH+n)C  
  // ClassWizard generated virtual function overrides s<Px au+A  
  //{{AFX_VIRTUAL(CHookApp) =i O K($  
 public: '/trM%<  
  virtual BOOL InitInstance(); B"rnSui  
  virtual int ExitInstance(); .&:y+Oww~  
  //}}AFX_VIRTUAL >RZ]t[)y  
  //{{AFX_MSG(CHookApp) {7.."@Ob<v  
  // NOTE - the ClassWizard will add and remove member functions here. `z=U-v'H)D  
  // DO NOT EDIT what you see in these blocks of generated code ! O$%M.C'  
  //}}AFX_MSG $O9Nprf  
  DECLARE_MESSAGE_MAP() u.ubw(vv  
}; qpjtF'  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); r9McCebIW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); SAMP,un7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;jS2bc:8a  
BOOL InitHotkey(); FR&4i" +  
BOOL UnInit(); YNyaz\L  
#endif MB06=N  
veIR)i@dx  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %xF j;U?  
#include "stdafx.h" azF|L"-RP  
#include "hook.h" (L}  
#include <windowsx.h> rH Et]Xa  
#ifdef _DEBUG >{?~cNO&  
#define new DEBUG_NEW _:DnF  
#undef THIS_FILE ,#:*dl  
static char THIS_FILE[] = __FILE__; 6;6a.iZ  
#endif qk VGa%^  
#define MAX_KEY 100 \n$s5i-  
#define CTRLBIT 0x04 G- wQ weJ9  
#define ALTBIT 0x02 +aR.t@D+"Y  
#define SHIFTBIT 0x01 D;VQoO  
#pragma data_seg("shareddata") &/R`\(hEA  
HHOOK hHook =NULL; -e0C Bp  
UINT nHookCount =0; &D0suK#  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey Yt*2/jw^  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ,WSK '  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r!:W-Y%&#  
static int KeyCount =0; 8|*#r[x  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Z^5j.d{e$  
#pragma data_seg() k`FCyO  
HINSTANCE hins; feU]a5%XZ  
void VerifyWindow(); 5mxHOtvtWM  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) /J!C2  
//{{AFX_MSG_MAP(CHookApp) z(V?pHv+  
// NOTE - the ClassWizard will add and remove mapping macros here. D#Fe\8!l  
// DO NOT EDIT what you see in these blocks of generated code! V; 0{o  
//}}AFX_MSG_MAP aV"K%#N  
END_MESSAGE_MAP() ^PA[fL"  
o>*vG  
CHookApp::CHookApp() m}/LMY  
{ Au3> =x`  
 // TODO: add construction code here, :?W {vV  
 // Place all significant initialization in InitInstance OjO$.ecT  
} jyQ Bx  
;Yo9e~  
CHookApp theApp; wgfy; #  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3 d $  
{ _%^t[4)q  
 BOOL bProcessed=FALSE; \)Jv4U\;  
 if(HC_ACTION==nCode) &* GwA  
 { {];4  
  if((lParam&0xc0000000)==0xc0000000){// Key up oz $T.  
   switch(wParam) mw0#Dhyy1=  
   { jusP aAdW  
    case VK_MENU: h<;kj#qbb  
     MaskBits&=~ALTBIT; nn>< k"  
     break; R-nC+)^  
    case VK_CONTROL: uMOm<kn  
     MaskBits&=~CTRLBIT; %SORs(4  
     break; 7 +A-S9P)  
    case VK_SHIFT: )P4#P2  
     MaskBits&=~SHIFTBIT; {.F``2  
     break; D~_|`D5WK  
    default: //judge the key and send message k<W n  
     break; 2_Me 4  
   } R7aS{8nn  
   for(int index=0;index<MAX_KEY;index++){ qZRx,^gd  
    if(hCallWnd[index]==NULL) _|%pe]St  
     continue; E-h`lDoJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) DF D5">g@  
    {  FkJa+ZA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); !g:UkU\J  
     bProcessed=TRUE; ;-84cpfu  
    } )US|&> o8  
   } 48,Aq*JFw  
  } ,Yhy7w  
  else if((lParam&0xc000ffff)==1){ //Key down *0bbSw1kc  
   switch(wParam) YbZ<=ZzO4  
   { m(JFlO  
    case VK_MENU: ^9T6Ix{=  
     MaskBits|=ALTBIT; #sit8k`GR8  
     break; X;_0"g  
    case VK_CONTROL: YLk; ^?  
     MaskBits|=CTRLBIT; $IUP;  
     break; PZ69aZ*Gs  
    case VK_SHIFT: =QEg~sD^)s  
     MaskBits|=SHIFTBIT; e #l/jFJU  
     break; ^EU& 6M2  
    default: //judge the key and send message 2c fzLW(  
     break; <x@\3{{U  
   } }{/4sll  
   for(int index=0;index<MAX_KEY;index++) g#FqjE|mx  
   { G-oC A1UdN  
    if(hCallWnd[index]==NULL) }]sI?&xB  
     continue; Y.rHl4  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @%J?[PG  
    { ( _]{[dFr%  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); G}i\UXFE  
     bProcessed=TRUE; FVLXq0<Cj  
    } l ,)l"6OV  
   } k1 >%wR  
  } yZI4%fen  
  if(!bProcessed){ 6,  ag\  
   for(int index=0;index<MAX_KEY;index++){ _J&u{  
    if(hCallWnd[index]==NULL) xt +fu L  
     continue; W"Dj+/uS  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mh44  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); d T/*O8  
   } s9'g'O5  
  } BieII$\P%P  
 } g2C-)*'{yh  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 3@$h/xMJ  
} WlP@Tm5g/  
3f's>+,#%  
BOOL InitHotkey() 4q@o4C<0  
{ Pb} &c  
 if(hHook!=NULL){ |NtT-T)7  
  nHookCount++; pvy;L[c  
  return TRUE; y=9a2 [3Dz  
 } D]y6*Ha  
 else K1O/>dN_\O  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ~'fa,XZ<  
  if(hHook!=NULL) lGG1d  
   nHookCount++; F)e*w:D  
  return (hHook!=NULL); &:]_a?|*S  
} /G[y 24 Q  
BOOL UnInit() #2yOqUO\  
{ ;~~Oc  
 if(nHookCount>1){ NL&g/4A[a  
  nHookCount--; j K[VEhs  
  return TRUE; a-!"m  
 } y#AY+ >  
 BOOL unhooked = UnhookWindowsHookEx(hHook); U YUIpe  
 if(unhooked==TRUE){ .NjdkHYR  
  nHookCount=0; >4M_jC.  
  hHook=NULL; N _pJE?  
 } q(.%f3(  
 return unhooked; rF~q"9  
} +*0THol-  
Zz?+,-$_*&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) }WI24|`zM  
{ 86%weU/*  
 BOOL bAdded=FALSE; n^&QOII@>  
 for(int index=0;index<MAX_KEY;index++){ 8x,;B_Zu  
  if(hCallWnd[index]==0){ 9U}EVpD  
   hCallWnd[index]=hWnd; (-dJ0!  
   HotKey[index]=cKey; qwFn(pK[  
   HotKeyMask[index]=cMask; m$LZ3=v%8  
   bAdded=TRUE; W\~ZmA.  
   KeyCount++; "r"]NyM  
   break; =j;o, J:(  
  } DvOg|XUU0  
 } HwST^\Ao  
 return bAdded; D@ =.4z  
} )0}obPp  
KAsS= `  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) `SW`d<+L  
{ A5H[g`&  
 BOOL bRemoved=FALSE; ZN4&:9M  
 for(int index=0;index<MAX_KEY;index++){ fs)O7x-B(  
  if(hCallWnd[index]==hWnd){ :cC`wX$  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ HYg _{  
    hCallWnd[index]=NULL; nQ~q -=,L  
    HotKey[index]=0; ` jUn  
    HotKeyMask[index]=0; 5~[ Fh2+  
    bRemoved=TRUE; `7 B [<  
    KeyCount--; m",bfZ  
    break; RgRcW5VxK  
   } X*Q7Yu  
  } 9QX{b+}"e  
 } 3=K-+dhk|t  
 return bRemoved; XqwdJND  
} x)Th2es\  
ome>Jbdhe  
void VerifyWindow() jyT(LDsS  
{ R1m18GHQ  
 for(int i=0;i<MAX_KEY;i++){ m76]INq  
  if(hCallWnd!=NULL){ 2 rBF<z7  
   if(!IsWindow(hCallWnd)){ }`g*pp*  
    hCallWnd=NULL; eo,]b1C2n  
    HotKey=0; X>B/DT  
    HotKeyMask=0; k/mY. 2yPv  
    KeyCount--; ;kFp)*i  
   } QMsnfG  
  } #nxx\,i>  
 }  _HL3XT  
} r\1*N.O3|O  
TDseWdA  
BOOL CHookApp::InitInstance() DxD0iJ=W  
{ FG(`&S+,  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); V,"'k<y  
 hins=AfxGetInstanceHandle(); GkO6r'MVE  
 InitHotkey(); L7b{H2 2  
 return CWinApp::InitInstance(); @Uu\x~3y  
} y7Ub~q U  
ZN1p>+oY!  
int CHookApp::ExitInstance() NR [VGZj  
{ hPH7(f|c{g  
 VerifyWindow(); GJ$,@  
 UnInit(); g-s@m}[T  
 return CWinApp::ExitInstance(); V:+bq`  
} 0CR;t`M@  
hh{liS% 10  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file d"cfSH;h  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  (M=Br  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ uXC?fMWp.  
#if _MSC_VER > 1000 JQCwI`%i  
#pragma once ) jvkwC  
#endif // _MSC_VER > 1000 RAxz+1JT  
&sWyh[`P  
class CCaptureDlg : public CDialog PLyu1{1" z  
{ _aGdC8%[  
 // Construction {+EPE2X=C  
 public: 7lpVK]  
  BOOL bTray; u rOGOa$  
  BOOL bRegistered; .G]# _U  
  BOOL RegisterHotkey(); gdT_kb5HL8  
  UCHAR cKey; {3R ax5Ty  
  UCHAR cMask; R;yAqr29  
  void DeleteIcon(); 2uTa}{/%  
  void AddIcon(); vB{b/xmah  
  UINT nCount; *X #e  
  void SaveBmp(); #Q"vwek  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor cn0Fz"d  
  // Dialog Data iQF}x&a<  
  //{{AFX_DATA(CCaptureDlg) B@=<'/S\7  
  enum { IDD = IDD_CAPTURE_DIALOG }; &^H "T6  
  CComboBox m_Key; #V 6 -*  
  BOOL m_bControl; %},gE[N!J  
  BOOL m_bAlt; >C[1@-]G%7  
  BOOL m_bShift; w!RH*S  
  CString m_Path; a:}"\>Aj  
  CString m_Number; 4QNR_w  
  //}}AFX_DATA v~Qy{dn P  
  // ClassWizard generated virtual function overrides ;Y^RF?un  
  //{{AFX_VIRTUAL(CCaptureDlg) W wha?W>  
 public: +a-@ !J~:  
  virtual BOOL PreTranslateMessage(MSG* pMsg); t] wM_]+  
 protected: jVIpbG4 4  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support e63|Z[8  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ntV >m*^  
  //}}AFX_VIRTUAL ;vdgF  
  // Implementation 8 36m5/kH[  
 protected: 1,QZnF!.x  
  HICON m_hIcon; L@r.R_*H?s  
  // Generated message map functions ?8@*q6~8  
  //{{AFX_MSG(CCaptureDlg) j*4S]!  
  virtual BOOL OnInitDialog(); ,~xU>L^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ZPao*2xz  
  afx_msg void OnPaint(); :, [ !8QP  
  afx_msg HCURSOR OnQueryDragIcon(); sVd_O[  
  virtual void OnCancel(); `YNC_r#tG  
  afx_msg void OnAbout(); ~4MjJKzA  
  afx_msg void OnBrowse(); p,\bez  
  afx_msg void OnChange(); tq[",&K  
 //}}AFX_MSG :s '"u]  
 DECLARE_MESSAGE_MAP() gsWlTI  
}; o%PoSZZ  
#endif b^DV9mO4J  
"!6~*!]c  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file I%>]!X  
#include "stdafx.h" 0Y*gJ!a  
#include "Capture.h" MZW Y  
#include "CaptureDlg.h" C$G88hesn  
#include <windowsx.h> }|"*"kxi!  
#pragma comment(lib,"hook.lib") u6I0<i_KZ  
#ifdef _DEBUG efkie}  
#define new DEBUG_NEW .N5R?fmD  
#undef THIS_FILE dzNaow*0&V  
static char THIS_FILE[] = __FILE__; 4*XP;`  
#endif Po!JgcJ#\  
#define IDM_SHELL WM_USER+1 T.P Z}4  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `[` *@O(y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); k>;r9^D  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S%s|P=u  
class CAboutDlg : public CDialog G%8)6m'3  
{ wQrPS  
 public: ^=Tu>{uD  
  CAboutDlg(); \]#;!6ge  
  // Dialog Data '`~(Fkj  
  //{{AFX_DATA(CAboutDlg) xiOrk  
  enum { IDD = IDD_ABOUTBOX }; 2td|8vDA  
  //}}AFX_DATA MN M>  
  // ClassWizard generated virtual function overrides V<NsmC=g  
  //{{AFX_VIRTUAL(CAboutDlg) K6yFpVl  
 protected: ,iv%^C",)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support =']};  
  //}}AFX_VIRTUAL I;.! hV>E  
  // Implementation ?)o4 Kt'h  
 protected: b}*@=X=4o  
  //{{AFX_MSG(CAboutDlg) c;8"vJ  
  //}}AFX_MSG %)hIpxOrX  
  DECLARE_MESSAGE_MAP() )>X|o$2  
}; C|~JPcl  
~iR!3+yg4  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Jn@Mbl  
{ 5) n:<U*  
 //{{AFX_DATA_INIT(CAboutDlg) V.QzMF"o  
 //}}AFX_DATA_INIT uM#U!  
} bHQKRV  
lfpt:5a9&  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) eYD9#y  
{ @F(3*5c_Y  
 CDialog::DoDataExchange(pDX); Z/6'kE{l  
 //{{AFX_DATA_MAP(CAboutDlg) ! N"L`RWD  
 //}}AFX_DATA_MAP x+*L5$;h  
} Puth8$  
K@j^gF/0B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) N9JgV,`  
 //{{AFX_MSG_MAP(CAboutDlg) 8NAWA3^B  
 // No message handlers ?;r8SowZ7  
 //}}AFX_MSG_MAP +%le/Pg@  
END_MESSAGE_MAP() wUIsi<Oj  
H?=pWB  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w[,?- Xm  
: CDialog(CCaptureDlg::IDD, pParent) EDgob^>  
{ ]2xx+P#Y  
 //{{AFX_DATA_INIT(CCaptureDlg) LE0J ;|1  
  m_bControl = FALSE; Ot2zhR )  
  m_bAlt = FALSE; ` r'0"V  
  m_bShift = FALSE; %];h|[ax]  
  m_Path = _T("c:\\"); Ah"'hFY  
  m_Number = _T("0 picture captured."); 9#EHXgz  
  nCount=0; az \<sWb#  
  bRegistered=FALSE; =mi:<q  
  bTray=FALSE; G%P>A g  
 //}}AFX_DATA_INIT @pF fpHq?>  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7K>D@O  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); "EcX_>  
} %1-K);S J  
e-CNQnO~  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X$7Oo^1;  
{ h&=O-5  
 CDialog::DoDataExchange(pDX); | ((1V^  
 //{{AFX_DATA_MAP(CCaptureDlg) T~i%j@Q.6  
  DDX_Control(pDX, IDC_KEY, m_Key); w24{_ N  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); X(Y#9N"  
  DDX_Check(pDX, IDC_ALT, m_bAlt); r/NSD$-n  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); [x2JFS#4  
  DDX_Text(pDX, IDC_PATH, m_Path); ^CZCZ,v  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >lD;0EN  
 //}}AFX_DATA_MAP Q0zW ]a  
} YG0PxZmi  
C5O5S:|'  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) w5F4"nl#O}  
//{{AFX_MSG_MAP(CCaptureDlg) ./'~];&  
 ON_WM_SYSCOMMAND() FAQr~G}  
 ON_WM_PAINT() sU) TXL'_!  
 ON_WM_QUERYDRAGICON() CS/Mpmsp  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) !c3```*  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) EMVk:Vt]  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 1R0ffP]  
//}}AFX_MSG_MAP r\$6'+Si  
END_MESSAGE_MAP() _iG2J&1'L  
o&(wg(Rv  
BOOL CCaptureDlg::OnInitDialog() E,{GU  
{ {>8Pl2J  
 CDialog::OnInitDialog(); [8>z#*B  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); BdN8 ^W  
 ASSERT(IDM_ABOUTBOX < 0xF000); :83,[;GO2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); FJP< bREQ  
 if (pSysMenu != NULL) 9T(L"9r-e  
 { ;B&^yj&;  
  CString strAboutMenu; BjJ,"sT  
  strAboutMenu.LoadString(IDS_ABOUTBOX); K)\(wxv  
  if (!strAboutMenu.IsEmpty()) 4p.^'2m  
  { PG{i,xq_B{  
   pSysMenu->AppendMenu(MF_SEPARATOR); ?b||Cr  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); =43I1&_   
  } 0cHfxy3  
 } O^5UB~  
 SetIcon(m_hIcon, TRUE); // Set big icon KAd_zkUA  
 SetIcon(m_hIcon, FALSE); // Set small icon +7,8w  
 m_Key.SetCurSel(0); '.?^uM  
 RegisterHotkey(); b2N6L2~V  
 CMenu* pMenu=GetSystemMenu(FALSE); <f N; xIB  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ev9; Ld  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "\e:h| .G  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); $}t=RW  
 return TRUE; // return TRUE unless you set the focus to a control sLb8*fak  
} "`pNH'   
S]}}A  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) n.*3,4.]  
{ PU W[e%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) U^MuZ  
 { .%q$d d>>  
  CAboutDlg dlgAbout; v=!YfAn  
  dlgAbout.DoModal(); 3KSpB;HX  
 } B$rTwR"(-  
 else sf(i E(o  
 { o]Gguw5W{  
  CDialog::OnSysCommand(nID, lParam); "'m)VG  
 } 2 P=[  
} &VDl/qnaL  
2d*_Qq1  
void CCaptureDlg::OnPaint() Fh K&@@_  
{ z v>Oh#  
 if (IsIconic()) >OV<_(S4  
 { C,/O   
  CPaintDC dc(this); // device context for painting ?WQNIX4  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $B\ H  
  // Center icon in client rectangle I,b9t\(6  
  int cxIcon = GetSystemMetrics(SM_CXICON); ?v:ZU~i  
  int cyIcon = GetSystemMetrics(SM_CYICON); IV'p~t  
  CRect rect; ;j{7!GeKa  
  GetClientRect(&rect); lwc5S `"  
  int x = (rect.Width() - cxIcon + 1) / 2; we3tx{j  
  int y = (rect.Height() - cyIcon + 1) / 2; hq=,Z1J  
  // Draw the icon #ly@;!M  
  dc.DrawIcon(x, y, m_hIcon); OF[?Z  
 } &iNwvA%9D  
 else LN4qYp6)G  
 { 4S|=/f  
  CDialog::OnPaint(); k;k}qq`d  
 } iK#/w1`  
} `\bT'~P  
~2@Lx3t$  
HCURSOR CCaptureDlg::OnQueryDragIcon() (9 sIA*,}  
{ jNA1O68N  
 return (HCURSOR) m_hIcon; |~WYEh  
} {T=52h=e  
fiVHRSX60  
void CCaptureDlg::OnCancel() jfD1  
{ WK0C  
 if(bTray) t V03+&jF  
  DeleteIcon(); kZLMtj-   
  CDialog::OnCancel(); 4U=75!>  
} Z<U>A   
F30 ]  
void CCaptureDlg::OnAbout()  W^Y#pn  
{ mk!Dozb/  
 CAboutDlg dlg; lT'9u,6   
 dlg.DoModal(); 7\ypW$Ot  
} Gh}yb-$N`&  
o:"anHs  
void CCaptureDlg::OnBrowse() :P$#MC  
{ 6.5wZN9<|  
 CString str; T-gk<V  
 BROWSEINFO bi; g JjN<&,  
 char name[MAX_PATH]; er2cQS7R  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); x&Cp> +i  
 bi.hwndOwner=GetSafeHwnd(); `S3>3  
 bi.pszDisplayName=name; pu+ur=5&  
 bi.lpszTitle="Select folder"; Zp&@h-%YoD  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 9XLFHV("  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); bl;zR  
 if(idl==NULL)  Ow:1?Z{4  
  return; `]=oo%(h  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); vi!YN|}\  
 str.ReleaseBuffer(); ['q&@_d7  
 m_Path=str; c3)C{9T](  
 if(str.GetAt(str.GetLength()-1)!='\\') e)H!uR  
  m_Path+="\\"; -)jax  
 UpdateData(FALSE); ff e1lw%  
} fY,|o3#  
>Kivuc  
void CCaptureDlg::SaveBmp() sbj";h=E  
{ L?5f+@0.  
 CDC dc; H={&3poBz  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ;apzAF  
 CBitmap bm; ?kTWpXx"=  
 int Width=GetSystemMetrics(SM_CXSCREEN); Wht(O~F  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2;$ k(x]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); )JD(`  
 CDC tdc; ;`dh fcU  
 tdc.CreateCompatibleDC(&dc); WG u%7e]  
 CBitmap*pOld=tdc.SelectObject(&bm); x%N\5 V1  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c~=B0K-  
 tdc.SelectObject(pOld); =JS;;PzX[  
 BITMAP btm; y "w|g~x]c  
 bm.GetBitmap(&btm); pZ(Fx&fy  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 'zZcn" +!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); cXnKCzSxZq  
 BITMAPINFOHEADER bih; W_`A"WdT.  
 bih.biBitCount=btm.bmBitsPixel; l@JSK ;  
 bih.biClrImportant=0; lFSe?X^  
 bih.biClrUsed=0; p|+B3  
 bih.biCompression=0; $t~@xCi]S  
 bih.biHeight=btm.bmHeight; ememce,Np  
 bih.biPlanes=1; _ oFs #kW  
 bih.biSize=sizeof(BITMAPINFOHEADER); 2xwlKmI N  
 bih.biSizeImage=size; e@#kRklV&  
 bih.biWidth=btm.bmWidth; %JZZ%xc  
 bih.biXPelsPerMeter=0; L<V3KS2y  
 bih.biYPelsPerMeter=0; +7V{ABfGl  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zYY$D.  
 static int filecount=0; *sw7niw  
 CString name; O#a6+W"U  
 name.Format("pict%04d.bmp",filecount++); (X[CsaXt  
 name=m_Path+name; j*v40mXl`2  
 BITMAPFILEHEADER bfh; ? "/ fPV-  
 bfh.bfReserved1=bfh.bfReserved2=0; Iu@y(wyg  
 bfh.bfType=((WORD)('M'<< 8)|'B'); -r7]S  
 bfh.bfSize=54+size; bzN-*3YE=  
 bfh.bfOffBits=54; w|[RDaAb  
 CFile bf; ^].jH+7i*  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ S=`+Ryc  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); a:TvWzX,  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Kl{>jr8B3  
  bf.WriteHuge(lpData,size); zSEs?  
  bf.Close(); )D&M2CUw"f  
  nCount++; |RkcDrB~  
 } )E#2J$TD  
 GlobalFreePtr(lpData); /93l74.w  
 if(nCount==1) -]uUYe c  
  m_Number.Format("%d picture captured.",nCount); nlYR-.  
 else "syh=BC v  
  m_Number.Format("%d pictures captured.",nCount); *l+OlQI0+  
  UpdateData(FALSE); A - YBQPE  
} |'O[7uT  
}R[#?ty;]  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) `:m!~  
{ 3.d"rl  
 if(pMsg -> message == WM_KEYDOWN) CT9   
 { s=6}%%q6  
  if(pMsg -> wParam == VK_ESCAPE) b-U eIjX  
   return TRUE; IQ< MyB(  
  if(pMsg -> wParam == VK_RETURN) 9^"b*&>P  
   return TRUE; }?F`t[+  
 } %3q0(Xl  
 return CDialog::PreTranslateMessage(pMsg); i,A#&YDl  
} `1*nL,i  
s>k Uh  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Pi,QHb`>  
{ *L6PLe  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ UJfT!==U  
  SaveBmp(); /={Js*  
  return FALSE; @E( 7V(m/  
} tWTKgbj(  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ f4-a?bp  
 CMenu pop; ^D^4 YJz  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); C51bc6V  
 CMenu*pMenu=pop.GetSubMenu(0); Y2B &go  
 pMenu->SetDefaultItem(ID_EXITICON); ~R$~&x(b  
 CPoint pt; taGU  
 GetCursorPos(&pt); 5uq3\a  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); V.ht, ~l  
 if(id==ID_EXITICON) ETp%s{8  
  DeleteIcon(); E$9 Ys  
 else if(id==ID_EXIT) nJ4@I7Sk;  
  OnCancel(); QB.J,o*XD4  
 return FALSE; CT0l!J~5m~  
} W$U0[^1  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Om{l>24i.\  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) xtPLR/Z  
 AddIcon(); #&v/icz$  
 return res; *  tCS  
} 3lV^B[$  
AL$&|=C-$  
void CCaptureDlg::AddIcon() D7Y)?Z5A;  
{ XwV'Ha  
 NOTIFYICONDATA data; 8WE{5#oi  
 data.cbSize=sizeof(NOTIFYICONDATA); Y(cN}44  
 CString tip; s yU9O&<  
 tip.LoadString(IDS_ICONTIP);  ^p n(=4  
 data.hIcon=GetIcon(0); {t};-q!v$j  
 data.hWnd=GetSafeHwnd(); 2G$SpfeIu  
 strcpy(data.szTip,tip); m<L;  
 data.uCallbackMessage=IDM_SHELL; OD' ]:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; | mu+9   
 data.uID=98; 2[0JO.K 4  
 Shell_NotifyIcon(NIM_ADD,&data); l5l>d62  
 ShowWindow(SW_HIDE); G:x*BH+  
 bTray=TRUE; BpX6aAx  
} # :T-hRu  
^(viM?*  
void CCaptureDlg::DeleteIcon() zP6.xp3  
{ PtqJ*Z  
 NOTIFYICONDATA data; eZ"1gYqy  
 data.cbSize=sizeof(NOTIFYICONDATA); olLfko4$*V  
 data.hWnd=GetSafeHwnd(); :xKcpY[{  
 data.uID=98; NrP0Ep%V  
 Shell_NotifyIcon(NIM_DELETE,&data); p ?wI9GY  
 ShowWindow(SW_SHOW); '`1CBU$  
 SetForegroundWindow(); (98Nzgxgx}  
 ShowWindow(SW_SHOWNORMAL); :eo  
 bTray=FALSE; CK, 6ytB  
} {'16:dTJ  
'!f5?O+E  
void CCaptureDlg::OnChange() R |KD&!~Z  
{ 9&RFO$WH  
 RegisterHotkey(); 29XL$v],  
} ? FfC  
wP"dZagpj  
BOOL CCaptureDlg::RegisterHotkey() EGl^!.'  
{ npRS Ev  
 UpdateData(); Be+0NXLVy  
 UCHAR mask=0; %e*@CbO$  
 UCHAR key=0; 5SkW-+$  
 if(m_bControl) 5>AX*]c  
  mask|=4; T{wuj[ Q#:  
 if(m_bAlt) u&wiGwF[  
  mask|=2; j5@:a  
 if(m_bShift) K'#E3={tt  
  mask|=1;  +H$!a  
  key=Key_Table[m_Key.GetCurSel()]; =IAsH85Q  
 if(bRegistered){ 0ZQ'_g|%  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ccd8O{G.M  
  bRegistered=FALSE; 1:Si,d,wh  
 } _G1gtu]  
 cMask=mask; bI|2@H V2  
 cKey=key; vM_:&j_?``  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 0a"igq9t  
 return bRegistered; !n^OM?.4  
} ?W E  
m|OO,gR  
  四、小结 =)|-?\[w  
Q]p(u\*  
  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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