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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: <5:`tC2  
  vZ/Bzy@|  
  一、实现方法 ZBl!7_[_  
oeIza<:=R  
  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: xJ|_R,>.H  
:|PgGhW  
#pragma data_seg("shareddata") BoHpfx1C  
HHOOK hHook =NULL; //钩子句柄 ?)?}^  
UINT nHookCount =0; //挂接的程序数目 YK6zN>M}E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 QeNN*@ ='i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 s2t9+ZA+s  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey )HJ#|JpxC  
static int KeyCount =0; 0mi$_Ld+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 JJVdq-k+`  
#pragma data_seg() v2;' F  
5tQZf'pHfd  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 {'$+?V"&  
1?,1EYT"  
  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: ^M~Z_CQL2  
lmpBf{~ S  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Dwuao`~Xm  
cKey,UCHAR cMask) F0]xc  
{ zyPc<\HoK  
 BOOL bAdded=FALSE; y';"tDFb  
 for(int index=0;index<MAX_KEY;index++){ l7vxTj@(-  
  if(hCallWnd[index]==0){ VL2+"<  
   hCallWnd[index]=hWnd; G7uYkJO  
   HotKey[index]=cKey; %E*Q0/  
   HotKeyMask[index]=cMask; Zj5B}[,l\  
   bAdded=TRUE; c 4Wl^E 8  
   KeyCount++; M" R= ;n  
   break; \k>1q/T0V  
  } &"'Z)iWm  
 } iWp 6^g  
 return bAdded; / lDei}  
} KuJNKuHa.  
//删除热键 ckdXla  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Qs\*r@6?  
{ S:8 WBY]M  
 BOOL bRemoved=FALSE; pX?/=T@ Bw  
 for(int index=0;index<MAX_KEY;index++){ (Qf. S{;  
  if(hCallWnd[index]==hWnd){ P87Lo4R d  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 2wwJ>iR`  
    hCallWnd[index]=NULL; "X,*VQl:  
    HotKey[index]=0; P^[y~I#{  
    HotKeyMask[index]=0; V[2}  
    bRemoved=TRUE; e6gLYhf&  
    KeyCount--; 6<mlx'  
    break; \dJOZ2J<z  
   } J>8kJCh9g  
  } hMnm>  
 } Wn-'iD+9<  
 return bRemoved; 0)rayzv  
} SW)jDy  
Q)Q1a;o  
apZPHau6h  
  DLL中的钩子函数如下: \>[k0<  
l KG' KR.  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |8?e4yVd  
{ Y49&EQ  
 BOOL bProcessed=FALSE; ?azcWf z0  
 if(HC_ACTION==nCode) qs!A)H#  
 { pGd@%/]AO  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 eY[kUMo  
   switch(wParam) (0E<Fz V  
   {  ;z T3Fv\  
    case VK_MENU: 6bN8}\5  
     MaskBits&=~ALTBIT; 3JEg3|M(  
     break; '0w</g  
    case VK_CONTROL: D)tL}X$  
     MaskBits&=~CTRLBIT; 4W#DLip9  
     break; 0< 93i   
    case VK_SHIFT: 0f#xyS 3  
     MaskBits&=~SHIFTBIT; JOH\K0=e  
     break; +Fb+dU  
    default: //judge the key and send message %{-r'Yi%  
     break; S)?N6sz%  
   } (hEg&@  
   for(int index=0;index<MAX_KEY;index++){ \/64Xv3L0  
    if(hCallWnd[index]==NULL) 60 %VG  
     continue; .N7<bt@~)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) c h}wXn  
    { pu5%$}dBE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %JgdLnQE  
     bProcessed=TRUE; !yd ]~t 5Q  
    } $[Q;{Q  
   } "  sC]z}  
  } hpgOsF9Lh  
  else if((lParam&0xc000ffff)==1){ //有键按下 yi:}UlO  
   switch(wParam) Fv*Et-8tN5  
   { `~z[Hj=2  
    case VK_MENU: 5mS/,fs@  
     MaskBits|=ALTBIT; -y>~ :.  
     break;  yj=OR|v  
    case VK_CONTROL: 3b|=V  
     MaskBits|=CTRLBIT; #m17cDL  
     break; YmpaLZJ  
    case VK_SHIFT: w3z'ZCcr;"  
     MaskBits|=SHIFTBIT; Npi) R)  
     break; C1+f\A|9FP  
    default: //judge the key and send message cUr!U\X[  
     break; g)R2V  
   } &Q#*Nnb3  
   for(int index=0;index<MAX_KEY;index++){ ~> N63I6  
    if(hCallWnd[index]==NULL) z(>QGzyc  
     continue; mz+UkA'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lXZ*Pb<j  
    { ,i1BoG  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }%z%}V@(&  
     bProcessed=TRUE; \|6VGh \Z  
    } t0GJ$])  
   } fERO(o  
  } YYT#{>&  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 D6H?*4f]  
   for(int index=0;index<MAX_KEY;index++){ G|[{\  
    if(hCallWnd[index]==NULL) uT'l.*W6i  
     continue; iEZ+Znon  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) V[uSo$k+>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 22=sh;y+2  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -jy0Kl/p  
   } l? U!rFRq`  
  } i/skU9  
 } UfPHV%Wd  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !><asaB]1  
} fIl!{pv[  
/s~S\dG  
  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: [61*/=gWe  
aWlIq(dU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w#[cGaIB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !yxqOT-  
]d-.Mw,'  
  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: $xbW*w  
(wM` LE(Ks  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) pA8As  
{ S,nELV~!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) Y*PfU +y~  
 { /KX+'@  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 5K2K'ZkI  
  SaveBmp(); (/N&_r4x  
  return FALSE; 5.oIyC^Ik  
 } $\Y&2&1s  
 …… //其它处理及默认处理 &=BzsBh  
} DrkTM<  
-PAEJn5$O  
4$[o;t>  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 n\l?+)S *  
j&oRj6;Ha+  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 8>,w8(Nt  
8ZVQM7O  
  二、编程步骤 sHc-xnd  
"mf$E|  
  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"; #aU!f"SS  
U`i5B;k}-  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; twq~.:<o  
8zD>t~N2C  
  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; wCB*v<*  
lQHF=Jex  
  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; 1.F&gP)9  
!T][c~l  
  5、 添加代码,编译运行程序。 hc[ K VLpS  
/oHCV0!0  
三、程序代码 #~|k EGt  
 r!?ga  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL hOU H1m.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) >ep<W<b  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ {:K_=IRZ  
#if _MSC_VER > 1000 gCb+hQq\  
#pragma once w3(|A> s3  
#endif // _MSC_VER > 1000 ]=q auf>3  
#ifndef __AFXWIN_H__ fx5S2%f^  
#error include 'stdafx.h' before including this file for PCH p8~lGuH  
#endif {,Q )D$i  
#include "resource.h" // main symbols N3|:MMl  
class CHookApp : public CWinApp X3l>GeUi  
{ U`ttT5;  
 public: 1@}F8&EZ  
  CHookApp(); p2Ep(0w,R5  
  // Overrides THp_ dTD  
  // ClassWizard generated virtual function overrides {r&mNbz  
  //{{AFX_VIRTUAL(CHookApp) Uz^N6q  
 public: 9j>2C  
  virtual BOOL InitInstance(); {5E8eQ  
  virtual int ExitInstance(); 6DHK&<=D8  
  //}}AFX_VIRTUAL K$,Zg  
  //{{AFX_MSG(CHookApp) K6IT$$g  
  // NOTE - the ClassWizard will add and remove member functions here. JX=rL6Y@:;  
  // DO NOT EDIT what you see in these blocks of generated code ! 2!s PgIz  
  //}}AFX_MSG Svn7.Ivep  
  DECLARE_MESSAGE_MAP() ,=u;1  
}; .KA-=$~J1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); STW?0B'Jr  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <T}U 3lL^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  pux IJ  
BOOL InitHotkey(); ?}cmES kX@  
BOOL UnInit(); Vke<; k-  
#endif F}_b7 |^  
@Z~YFnEJi  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. V!He2<  
#include "stdafx.h" ; j!dbT~5  
#include "hook.h" hu}$\  
#include <windowsx.h> el9P@r0  
#ifdef _DEBUG =0g!Q   
#define new DEBUG_NEW MYS`@%ZV#k  
#undef THIS_FILE loVg{N :  
static char THIS_FILE[] = __FILE__; 'Cc~|gOgD  
#endif $gUlM+sK  
#define MAX_KEY 100 oe*1jR_J`[  
#define CTRLBIT 0x04 d+q],\"R  
#define ALTBIT 0x02 9&Jf4lC94  
#define SHIFTBIT 0x01 VHD+NY/  
#pragma data_seg("shareddata") y8k8Hd1<f  
HHOOK hHook =NULL; X0;u7g2Yz  
UINT nHookCount =0; b)d;eS  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ( s3k2Z  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT {<,%_pJR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey r:g\  
static int KeyCount =0; Z =+Z96  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift JQ03om--(  
#pragma data_seg() qbv\uYow3k  
HINSTANCE hins; =tOB fRM  
void VerifyWindow(); 2RkW/) A9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) *dw.=a9  
//{{AFX_MSG_MAP(CHookApp) Bh3F4k2bg7  
// NOTE - the ClassWizard will add and remove mapping macros here. Ehx9-*]  
// DO NOT EDIT what you see in these blocks of generated code! eYUb>M)  
//}}AFX_MSG_MAP U~x]2{}  
END_MESSAGE_MAP()  <mn[-  
O4R\] B#Xu  
CHookApp::CHookApp() ix!xLm9\  
{ ~>CvZ 7K  
 // TODO: add construction code here, U^dfNi@q  
 // Place all significant initialization in InitInstance }DhqzKl  
} W@d&X+7e  
:PO./IBX  
CHookApp theApp; UGcmzwE  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ?:"ABkL|+Y  
{ _(N+z.  
 BOOL bProcessed=FALSE; [dJ!JT/X{  
 if(HC_ACTION==nCode) jWrU'X  
 { T9nb ~ P[  
  if((lParam&0xc0000000)==0xc0000000){// Key up =~1EpZ  
   switch(wParam) /WN YS  
   { 6w^P{%ul  
    case VK_MENU: [HILK `@@  
     MaskBits&=~ALTBIT;  2v{WX  
     break; E %mEfj7  
    case VK_CONTROL: x92^0cMf  
     MaskBits&=~CTRLBIT; 2R/|/>T v  
     break; :K| H/kht  
    case VK_SHIFT: oZBD.s  
     MaskBits&=~SHIFTBIT; c*IrZm  
     break; K%z!#RyJ4  
    default: //judge the key and send message -| .NwGh  
     break; }3#\vn0gT  
   } {7M++J=  
   for(int index=0;index<MAX_KEY;index++){ "jL>P )  
    if(hCallWnd[index]==NULL) }N g P`m  
     continue; zgb$@JC  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6K.2VY#  
    { 7+HK_wNi  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); fL*7u\m:  
     bProcessed=TRUE; @v)Z>xv  
    } ?ko#N?hgI  
   } xM jn=\}  
  } Ta?J;&<u]/  
  else if((lParam&0xc000ffff)==1){ //Key down NEq_!!/sF  
   switch(wParam) tguB@,O  
   { h:4(Gm;  
    case VK_MENU: S=qh7ML  
     MaskBits|=ALTBIT; @A,8 >0+  
     break; DDrR9}k  
    case VK_CONTROL: P $`1}  
     MaskBits|=CTRLBIT; SXL3>-Z E  
     break; [ws _ g,/  
    case VK_SHIFT: o 4F'z  
     MaskBits|=SHIFTBIT; ~` tuPk~l  
     break; | eBwcC#^  
    default: //judge the key and send message u BEw YQB  
     break;  [Sm<X  
   } khy'Y&\F;  
   for(int index=0;index<MAX_KEY;index++) a#p+.)Wm  
   { w'@gzK  
    if(hCallWnd[index]==NULL) Ks.b).fH  
     continue; |1@O>GG  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Olzw)WjG  
    { i~u4v3r=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2 }xePX9?  
     bProcessed=TRUE; aT0~C.vT  
    } I\)`,w  
   } L.;b( bFe  
  } <nk|Z'G E  
  if(!bProcessed){ 8Ths"zwn  
   for(int index=0;index<MAX_KEY;index++){ \[G'cE  
    if(hCallWnd[index]==NULL) UQ0!tFx  
     continue; s#$t!F??9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) J*B-*6O44  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); IyO 0~Vx>  
   } )\+Imn  
  } ucl001EK  
 } v H HgZ  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z %pc"  
} 6))":<J  
WuK<?1meN  
BOOL InitHotkey() 4?pb!@l  
{ > .wZEQ6QK  
 if(hHook!=NULL){ P-X|qVNK1Z  
  nHookCount++; +^7cS6"L  
  return TRUE; TuwP'g[  
 } 0AM_D >fH  
 else D`XXR}8V  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); zgjg#|  
  if(hHook!=NULL) eU"yF >6'  
   nHookCount++; g9C ; JmU  
  return (hHook!=NULL); ^; KC E  
} p[4 +`8  
BOOL UnInit() Luao?;|U  
{ EZ!! V~  
 if(nHookCount>1){ KS_+R@3Z  
  nHookCount--; GgxPpS<ne  
  return TRUE; 8~!E.u9w  
 } uzp\V 39  
 BOOL unhooked = UnhookWindowsHookEx(hHook); kF1$  
 if(unhooked==TRUE){ W*LC3B^  
  nHookCount=0; (MXy\b<  
  hHook=NULL;  %lj5Olj  
 } f`4=Bl&"{  
 return unhooked; rQv5uoD  
} &S="]*Z  
APl]EV" l  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) her>L3G-E  
{ bqn(5)%{  
 BOOL bAdded=FALSE; sm18u-  
 for(int index=0;index<MAX_KEY;index++){ i&DbZ=n2  
  if(hCallWnd[index]==0){ 2D!jVr!  
   hCallWnd[index]=hWnd; fV+a0=Z  
   HotKey[index]=cKey; WSpF/Wwc  
   HotKeyMask[index]=cMask; -#I]/7^  
   bAdded=TRUE; 4`?PtRX  
   KeyCount++; .$~3RjM  
   break; r (m3"Xu6O  
  } 1tbA-+  
 } !$n@:W/  
 return bAdded; /J^dz vH  
} }wo:1v8J  
 Ht.P670  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _HM?p(H@  
{ !=S?*E +j)  
 BOOL bRemoved=FALSE; X!g;;DB\  
 for(int index=0;index<MAX_KEY;index++){ pwMA,X/{  
  if(hCallWnd[index]==hWnd){ (pH)QG  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8K2@[TE=5  
    hCallWnd[index]=NULL; Ep-bx&w+  
    HotKey[index]=0; pYcs4f!?p  
    HotKeyMask[index]=0; L%H\|>k`  
    bRemoved=TRUE; f:3cV(mC  
    KeyCount--; 8i$|j~M a  
    break; 0Fkr3x  
   } ~AWn 1vFc  
  } [!U%''  
 } 9O &]!ga  
 return bRemoved; Wpf~Ji6||  
} OM.-apzC  
UD14q~ (1Z  
void VerifyWindow() @V>]95RX  
{ <IIz-6*V  
 for(int i=0;i<MAX_KEY;i++){ ?9xWTVa8  
  if(hCallWnd!=NULL){ 4Kt0}W  
   if(!IsWindow(hCallWnd)){ <LZ#A@]71  
    hCallWnd=NULL; xVsI#`<a  
    HotKey=0; 0]f/5jvLj  
    HotKeyMask=0; 0++RxYFCL  
    KeyCount--; .0,G4k/yv  
   } h>>~Bi  
  } DN%JT[7  
 } '-(Z.e~e  
} CE{2\0Q  
cGs& Kn;h  
BOOL CHookApp::InitInstance() 5(2 C  
{ fP 3eR>e  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); n?c[ E+i;  
 hins=AfxGetInstanceHandle(); o5Rv xGN  
 InitHotkey(); qsEFf(9G  
 return CWinApp::InitInstance(); =,6X_m  
} CqWO 0  
 R`o Xkj  
int CHookApp::ExitInstance() w^cQL%  
{ Gv]94$'J9  
 VerifyWindow(); L{1[:a)']B  
 UnInit(); Vo[.^0  
 return CWinApp::ExitInstance(); >mtwXmI  
} Rt,po  
w_"-rGV  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file V:t{mu5j  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) #lik: ?  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ d" 0&=/  
#if _MSC_VER > 1000 *'?V>q,  
#pragma once uMm`j?Y23q  
#endif // _MSC_VER > 1000 %jx<<hW  
T+gH38!e  
class CCaptureDlg : public CDialog N2|NYDQs  
{ QxbG-B^)=  
 // Construction n@H;*nI|  
 public: L)<~0GcP  
  BOOL bTray; @+ T33X)h%  
  BOOL bRegistered; g/FT6+&T.  
  BOOL RegisterHotkey(); , ExY.'%1  
  UCHAR cKey; 7wY0JS$fz  
  UCHAR cMask; !]fSS)\H  
  void DeleteIcon(); UCj<FN `  
  void AddIcon(); dEI!r1~n  
  UINT nCount; ,* \s  
  void SaveBmp(); UHk)!P>  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor xFIzq  
  // Dialog Data 6~>h;wC  
  //{{AFX_DATA(CCaptureDlg) . qf~t/o  
  enum { IDD = IDD_CAPTURE_DIALOG }; `WMU'ezF  
  CComboBox m_Key; 5zZQt +Ip  
  BOOL m_bControl; "E4CQL'U  
  BOOL m_bAlt; x&JD~,Y  
  BOOL m_bShift; p1.3)=T  
  CString m_Path; y\CxdTs  
  CString m_Number; LOG>x!  
  //}}AFX_DATA K:VZ#U(_  
  // ClassWizard generated virtual function overrides 9D,!]  
  //{{AFX_VIRTUAL(CCaptureDlg) 8N |K   
 public: +Y;hVc E9  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 1A* "v  
 protected: oLq N  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0N]\f.=`  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7 +KI9u}-  
  //}}AFX_VIRTUAL 6f t6;*,  
  // Implementation E{^W-  
 protected:  8 }AWU  
  HICON m_hIcon; zN)).a  
  // Generated message map functions zTPNQ0=|  
  //{{AFX_MSG(CCaptureDlg) C1l'<  
  virtual BOOL OnInitDialog(); amX1idHo^  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Nq6; z)$  
  afx_msg void OnPaint(); |TQ4:P1T  
  afx_msg HCURSOR OnQueryDragIcon(); H?ug-7k/  
  virtual void OnCancel(); ^wwS`vPb  
  afx_msg void OnAbout(); R>5Xv%R  
  afx_msg void OnBrowse(); bI(8Um6m  
  afx_msg void OnChange(); Ejf5M\o  
 //}}AFX_MSG YdIZikF#  
 DECLARE_MESSAGE_MAP() 8<ev5af  
}; 8X278^ #  
#endif R >&8%%#  
*XYp~b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file Hr7pcz/#l  
#include "stdafx.h" "(dI/}  
#include "Capture.h" ][#|5UK8L  
#include "CaptureDlg.h" M^hz<<:$  
#include <windowsx.h> ;R<V-gab  
#pragma comment(lib,"hook.lib") Nz*,m'-1e  
#ifdef _DEBUG DWCf+4  
#define new DEBUG_NEW yOAC<<Tzus  
#undef THIS_FILE jffNA^e  
static char THIS_FILE[] = __FILE__; 6V@_?a-K  
#endif (#)XRm{t  
#define IDM_SHELL WM_USER+1 a<E9@  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4gVIuF*pS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); h^1 !8oOYD  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; >p;&AaXkoG  
class CAboutDlg : public CDialog Z#^|h0  
{ :qAX9T'{t  
 public: myqwU`s  
  CAboutDlg(); 7xux%:BN  
  // Dialog Data iC>%P&|-)|  
  //{{AFX_DATA(CAboutDlg) _Y}cK| 3  
  enum { IDD = IDD_ABOUTBOX }; !#*#jixo  
  //}}AFX_DATA L 8;H_:~_'  
  // ClassWizard generated virtual function overrides z}7}D !  
  //{{AFX_VIRTUAL(CAboutDlg) \1n (Jr.<  
 protected: Ai^0{kF6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  ylS6D  
  //}}AFX_VIRTUAL DO+~    
  // Implementation -AolW+Y  
 protected: gX(Xj@=(&  
  //{{AFX_MSG(CAboutDlg) [kckE-y  
  //}}AFX_MSG  s_+.xIZ  
  DECLARE_MESSAGE_MAP() b35 3+7"|  
}; ]l+<-  
0w< ilJ  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 6X?:mn'%QF  
{ ;O{bF8 U  
 //{{AFX_DATA_INIT(CAboutDlg) 1wd c4>  
 //}}AFX_DATA_INIT _iEnS4$A8  
} Dsc0 ;7~6  
%4V$')rek  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) :2/ jI:L~  
{ "M\rO!f:  
 CDialog::DoDataExchange(pDX); HVhd#Q;  
 //{{AFX_DATA_MAP(CAboutDlg) jAv3qMQA  
 //}}AFX_DATA_MAP v&d'ABeT  
} . &`YlK  
o2hZ=+w>  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) !>=lah$&  
 //{{AFX_MSG_MAP(CAboutDlg) u2`j\ Vu  
 // No message handlers qN9 ?$\  
 //}}AFX_MSG_MAP x>tm[k  
END_MESSAGE_MAP() a\oz-`ESa  
.XRe:\8mc  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) aJF/y3  
: CDialog(CCaptureDlg::IDD, pParent) Q-#<{' (  
{ I|>.&nb  
 //{{AFX_DATA_INIT(CCaptureDlg) 8bs'Ek{'o  
  m_bControl = FALSE; e>.^RtDF  
  m_bAlt = FALSE; !TN)6e7`  
  m_bShift = FALSE; WQ9VcCY  
  m_Path = _T("c:\\"); l\TL=8u2c  
  m_Number = _T("0 picture captured."); @zJiR{Je-U  
  nCount=0; .7+"KP:  
  bRegistered=FALSE; y~z&8XrH  
  bTray=FALSE; Ih[k{p  
 //}}AFX_DATA_INIT Zul@aS !  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 y,6KU$G  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ;3iWV"&_A  
} 7e[&hea  
FzF#V=9lP  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) KuF>2KX~Y  
{ a{Y8 hR  
 CDialog::DoDataExchange(pDX); Z?qc4Cg  
 //{{AFX_DATA_MAP(CCaptureDlg) EgRuB@lw76  
  DDX_Control(pDX, IDC_KEY, m_Key); I5]58Ohx  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); _z\qtl~3  
  DDX_Check(pDX, IDC_ALT, m_bAlt); a :CeI  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ($!g= 7  
  DDX_Text(pDX, IDC_PATH, m_Path); QS@eqN  
  DDX_Text(pDX, IDC_NUMBER, m_Number); _y:a Pn  
 //}}AFX_DATA_MAP ([A%>u>h  
} `69xR[f  
Hn]6re  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) keJ-ohv)  
//{{AFX_MSG_MAP(CCaptureDlg) O`_]n  
 ON_WM_SYSCOMMAND() (hIe!"s *  
 ON_WM_PAINT() miV8jaV  
 ON_WM_QUERYDRAGICON() A{wk$`vH  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) /S9n!H:MT  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) -h2 1  
 ON_BN_CLICKED(ID_CHANGE, OnChange) [9Hrpo]tU:  
//}}AFX_MSG_MAP ,w,)n^  
END_MESSAGE_MAP() 9LUk[V  
&D`$YUl@  
BOOL CCaptureDlg::OnInitDialog() 7U - ?Rd  
{ @9g!5dcT  
 CDialog::OnInitDialog(); RPkOtRKL=w  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); zc1~ q  
 ASSERT(IDM_ABOUTBOX < 0xF000); P9]95.j  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ! H4uc  
 if (pSysMenu != NULL) ! 6_tdZ  
 { \V*E:_w*  
  CString strAboutMenu; %sS7o3RW\  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ;_1 >nXh  
  if (!strAboutMenu.IsEmpty()) _m1WY7  
  { _p| KaT``  
   pSysMenu->AppendMenu(MF_SEPARATOR); CM+wkU ?,  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `4"&_ltD  
  } xKoNo^FF  
 } _LLE~nUK"/  
 SetIcon(m_hIcon, TRUE); // Set big icon ;W!hl<``d*  
 SetIcon(m_hIcon, FALSE); // Set small icon leEzfbb{'.  
 m_Key.SetCurSel(0); 0.!Q 4bhD  
 RegisterHotkey(); v?h8-yed  
 CMenu* pMenu=GetSystemMenu(FALSE); |9 4xRC  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); l5_%Q+E_  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 7@i2Mz/eV  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); z|G 39  
 return TRUE; // return TRUE unless you set the focus to a control |Vc:o_n7  
} \8S HX  
qzu%Pp6If  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,lw<dB@7"5  
{ mQt?d?6  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) @0rwvyE=+3  
 { !& xc.39  
  CAboutDlg dlgAbout; U_e e3KKA  
  dlgAbout.DoModal(); cH$Sk  
 } ;AgXl%Q  
 else  ?ik6kWI  
 { siGt5RH*  
  CDialog::OnSysCommand(nID, lParam); GGn/J&k  
 } {~:F1J~=  
} qxglA*/ [  
XWFuAE  
void CCaptureDlg::OnPaint() \) T4NN  
{ :n<<hR0d  
 if (IsIconic()) 5VPP 2;J  
 { ^<O:`c6_  
  CPaintDC dc(this); // device context for painting ~0@+8%^>;  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); iG;GAw|E  
  // Center icon in client rectangle Gu136XiX  
  int cxIcon = GetSystemMetrics(SM_CXICON); KwuNHK)-  
  int cyIcon = GetSystemMetrics(SM_CYICON); sp$W=Wu7  
  CRect rect; )|@UY(VZ^  
  GetClientRect(&rect); EJ3R{^  
  int x = (rect.Width() - cxIcon + 1) / 2; K|LS VN?K  
  int y = (rect.Height() - cyIcon + 1) / 2; !'EE8Tp~F  
  // Draw the icon />9?/&N6"  
  dc.DrawIcon(x, y, m_hIcon); YG6Kvc6T  
 } i&?do{YQ)  
 else SpUcrK;1  
 { onj:+zl  
  CDialog::OnPaint(); xN#. Pm~  
 } o$DJL11E  
} (P N!k0Y  
8"g.Z*  
HCURSOR CCaptureDlg::OnQueryDragIcon()  =j1rw  
{ OVm $  
 return (HCURSOR) m_hIcon; 5:H9B  
} UN}jpu<h  
i XI:yE;  
void CCaptureDlg::OnCancel() [UHDN:y  
{ (9J,Qs[;  
 if(bTray) nUvxO `2  
  DeleteIcon(); V/G'{ q  
  CDialog::OnCancel(); ]l'W=_XDg  
} <j.bG 7  
j5:{H4?  
void CCaptureDlg::OnAbout() Dyj5a($9"{  
{ &V&0kp@+  
 CAboutDlg dlg; =,~h]_\_  
 dlg.DoModal(); ~sQN\]5VW  
} 5Qik{cWxBq  
M"]~}*  
void CCaptureDlg::OnBrowse() x.+}-(`W#~  
{ oP".>g-.  
 CString str; p_jDnb#  
 BROWSEINFO bi; *Ki ],>_~  
 char name[MAX_PATH]; 5B? >.4R  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \dbjh{  
 bi.hwndOwner=GetSafeHwnd(); !0~$u3[b  
 bi.pszDisplayName=name; tw]RH(g+#  
 bi.lpszTitle="Select folder"; MX?K3=j @>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; bO: Ei  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); _n(NPFV  
 if(idl==NULL) 0=;jGh}|i  
  return; _Va!Ky =]  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ~n84x  
 str.ReleaseBuffer(); Dqe/n_Z  
 m_Path=str; })|+tZ  
 if(str.GetAt(str.GetLength()-1)!='\\')  )>Oip  
  m_Path+="\\"; O edL?4  
 UpdateData(FALSE); H>[1D H#b  
} SQ)$>3>C  
. oUaq|O  
void CCaptureDlg::SaveBmp() Zg|z\VR  
{ l,*v/95h  
 CDC dc; R v6{ '\:  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); lC +p2OG^[  
 CBitmap bm; |$":7)e H!  
 int Width=GetSystemMetrics(SM_CXSCREEN); 5f7;pS<  
 int Height=GetSystemMetrics(SM_CYSCREEN); oq=D9  
 bm.CreateCompatibleBitmap(&dc,Width,Height); YZf<S:  
 CDC tdc; bv>;%TF  
 tdc.CreateCompatibleDC(&dc); h%(dT/jPL)  
 CBitmap*pOld=tdc.SelectObject(&bm); E) >~0jv  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _tL*sA>[~)  
 tdc.SelectObject(pOld); ( =->rP  
 BITMAP btm; 2s;/*<WM  
 bm.GetBitmap(&btm); |^Z1 D TAw  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >/EmC3?b!  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); YcGSZ0vQ  
 BITMAPINFOHEADER bih; `pN"T?Pk  
 bih.biBitCount=btm.bmBitsPixel; &~U8S^os  
 bih.biClrImportant=0; __$IbF5  
 bih.biClrUsed=0; ` &|Rs  
 bih.biCompression=0; Vf*!m~]Vqi  
 bih.biHeight=btm.bmHeight; 0^|)[2m!  
 bih.biPlanes=1; \CB{Ut+s  
 bih.biSize=sizeof(BITMAPINFOHEADER); Fg?Gx(g4  
 bih.biSizeImage=size; h/`OG>./  
 bih.biWidth=btm.bmWidth; }+QgRGQ  
 bih.biXPelsPerMeter=0; yEtSyb~GK  
 bih.biYPelsPerMeter=0; X_|8CD-@6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =lS~2C  
 static int filecount=0; G!oq ;<  
 CString name; ._=Pa)T  
 name.Format("pict%04d.bmp",filecount++); `Te n2(D  
 name=m_Path+name; ? 8S0  
 BITMAPFILEHEADER bfh; lKI1bs]i  
 bfh.bfReserved1=bfh.bfReserved2=0; |h*H;@$  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 4*l ShkL  
 bfh.bfSize=54+size; 4kNf4l9Y  
 bfh.bfOffBits=54; 0X`Qt[  
 CFile bf; 06pLa3oi  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ t'_Hp},  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); <m`HK.|~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Tm_AoZH  
  bf.WriteHuge(lpData,size); ]o_Z3xXUa  
  bf.Close(); 85m[^WGyh  
  nCount++; 6~0S%Hz   
 } HW"|Hm$Y(  
 GlobalFreePtr(lpData); 7NMQUN7k '  
 if(nCount==1) OTL=(k  
  m_Number.Format("%d picture captured.",nCount); lOPCM1Se  
 else gf2l19aP  
  m_Number.Format("%d pictures captured.",nCount); &'N{v@Oi)  
  UpdateData(FALSE); nE+sbfC   
} A0cC)bd&  
-B9C2  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) +e`f|OQ  
{ n(/(F `  
 if(pMsg -> message == WM_KEYDOWN) 8uM>UpX  
 { >,y291p2  
  if(pMsg -> wParam == VK_ESCAPE) Cv>|>Ob#  
   return TRUE; f`.8.1Rd  
  if(pMsg -> wParam == VK_RETURN) \ZigG{  
   return TRUE; BP,"vq$'+  
 } uo_Y"QiKEH  
 return CDialog::PreTranslateMessage(pMsg); GX&BUP\  
} +b.<bb6  
7;#9\a:R?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M3odyO(  
{ s&iM.[k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 6,G1:BV{K  
  SaveBmp(); &v Lz{  
  return FALSE; VtUe$ft  
} ?!U=S=8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ U,LW(wueT  
 CMenu pop; hq6fDRO/4  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4v T!xn  
 CMenu*pMenu=pop.GetSubMenu(0); Yew n  
 pMenu->SetDefaultItem(ID_EXITICON); Al09R,I;  
 CPoint pt; 9 #TzW9  
 GetCursorPos(&pt); }tF/ca:XPQ  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); @H= d8$  
 if(id==ID_EXITICON) TUIj-HSe  
  DeleteIcon(); 81eDN6 M\  
 else if(id==ID_EXIT) A07g@3n  
  OnCancel(); $HF. 02{|  
 return FALSE; 01g=Cg  
} b4Br!PL@G  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ah1d0e P  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) MIo<sJuv  
 AddIcon(); )XmV3.rI  
 return res; ;n%SjQ'%  
} PUV)w\!&is  
P9p:x6  
void CCaptureDlg::AddIcon() VLC<ju!  
{ "CLoM\M)  
 NOTIFYICONDATA data; .+MJ' bW  
 data.cbSize=sizeof(NOTIFYICONDATA); E0!}~Z)  
 CString tip; rL3<r  
 tip.LoadString(IDS_ICONTIP); K*&M:u6E  
 data.hIcon=GetIcon(0); {a\O7$A\F  
 data.hWnd=GetSafeHwnd(); ,;)Y 1q}Q  
 strcpy(data.szTip,tip); $}_N379&  
 data.uCallbackMessage=IDM_SHELL; GR@!mf  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ;  n0F.Um  
 data.uID=98; )uC],CbW{  
 Shell_NotifyIcon(NIM_ADD,&data); C93BK)$}  
 ShowWindow(SW_HIDE); k!3X4;F!_  
 bTray=TRUE; u~[HC)4(0  
} . <`i!Ls  
+%Q:  
void CCaptureDlg::DeleteIcon() R''nZ/R  
{ 4e~^G  
 NOTIFYICONDATA data; zs e<b/G1G  
 data.cbSize=sizeof(NOTIFYICONDATA); d9>*a$x;/  
 data.hWnd=GetSafeHwnd(); ~qt)r_jW  
 data.uID=98; I=o[\?u*_  
 Shell_NotifyIcon(NIM_DELETE,&data); "X0"=1R~  
 ShowWindow(SW_SHOW); F-[zuYGp  
 SetForegroundWindow(); v,y nz'>)  
 ShowWindow(SW_SHOWNORMAL); IROX]f}r(  
 bTray=FALSE; BZq_om6  
} [zv>Wlf,%  
%a=K:" oU[  
void CCaptureDlg::OnChange() ]Q,;5>#W  
{ bP\0S@1YL  
 RegisterHotkey(); _G%]d$2f`  
} =y -L'z&r  
 %Xs3Lz  
BOOL CCaptureDlg::RegisterHotkey() oJa6)+b(3  
{ `Fa49B|`D  
 UpdateData(); WA}<Zme3[  
 UCHAR mask=0; E}AOtY5a  
 UCHAR key=0; 9<u^.w  
 if(m_bControl) g?` g+:nug  
  mask|=4; !$Aijd s5  
 if(m_bAlt) BC*vG=a  
  mask|=2; [p[nK=&r  
 if(m_bShift) JwCv(1$GM  
  mask|=1; ^7M hnA  
  key=Key_Table[m_Key.GetCurSel()]; MJNY#v3  
 if(bRegistered){ ASmMj;>UM  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f0p+l -iEv  
  bRegistered=FALSE; Z0&^U#]  
 } f ?8cO#GU  
 cMask=mask; j_N><_Jc  
 cKey=key; u.;zz'|  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "hwg";Z$n  
 return bRegistered; j.FA!4L  
} S\fEV"  
1=BDqSZ@9  
  四、小结 X"WKgC g$  
@sQ^6FK0G  
  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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