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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%ddJn[.)  
  U:$`M,762Z  
  一、实现方法 viVn  
R!rMrWX  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: TdoH(( nY  
Fo]]j=  
#pragma data_seg("shareddata") bnE&-N*  
HHOOK hHook =NULL; //钩子句柄 LI"N^K'z  
UINT nHookCount =0; //挂接的程序数目 /4+*!X  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 CKDg3p';  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9 Lqz:4}  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey V0gu0+u~R  
static int KeyCount =0; W5&KmA  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 (c[DQSj  
#pragma data_seg() <F| S<\Y.  
*Ym+xu_5  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 -1R7 8(1  
2%]#rZ  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: `Cu9y+t  
t4-0mNBZt$  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR fY|vq amA;  
cKey,UCHAR cMask) ~\c  j  
{ pFwe&_u]  
 BOOL bAdded=FALSE; AUl[h&s  
 for(int index=0;index<MAX_KEY;index++){ Q2!RFtXV  
  if(hCallWnd[index]==0){ Q%t _Epe  
   hCallWnd[index]=hWnd; wJ7Fnj>u%  
   HotKey[index]=cKey; ASNo6dP 7  
   HotKeyMask[index]=cMask; >DW%i\k1V~  
   bAdded=TRUE; li~=85 J  
   KeyCount++; H#bu3*'  
   break; F+V[`w*k  
  } "2I{T  
 } #Vm)wH3  
 return bAdded; R7x*/?  
} _cbXzSYq&  
//删除热键 D6EqJ,~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) W#9LK Jj  
{ /NVyzM51V  
 BOOL bRemoved=FALSE; zG&yu0;D6  
 for(int index=0;index<MAX_KEY;index++){ u 0 K1n_  
  if(hCallWnd[index]==hWnd){ QW%xwV?8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ QX9['B<  
    hCallWnd[index]=NULL; 6 %T_;"hb  
    HotKey[index]=0; -"xC\R  
    HotKeyMask[index]=0; -}Rh+n`  
    bRemoved=TRUE; _%aT3C}k  
    KeyCount--; H]Gj$P=k  
    break; hud'@O"R+  
   } ,9 .NMFn  
  } 0fR?zT?  
 } D\sh +}"  
 return bRemoved; BagV\\#v4  
} mpl^LF[  
`P;uPQDzZ3  
lq27^K  
  DLL中的钩子函数如下: W1O m$S1  
@h7 i;Ok  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j,N,WtE  
{ 4Y@q.QP  
 BOOL bProcessed=FALSE; r / L  
 if(HC_ACTION==nCode) l{_1`rC'  
 { &|Vzo@D(!  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }z2K"eGt  
   switch(wParam) ]tEH`Kl  
   {  o(xt%'L`t  
    case VK_MENU: vu/P"?F  
     MaskBits&=~ALTBIT; LeMo")dk\  
     break; jL~. =QD  
    case VK_CONTROL: 0O?!fd n  
     MaskBits&=~CTRLBIT; bj 0-72V  
     break; W-vEh  
    case VK_SHIFT: X""}]@B9z  
     MaskBits&=~SHIFTBIT; 6^nxw>-   
     break; 4n.EA,:g:(  
    default: //judge the key and send message L4Si0 K  
     break; |C\XU5}  
   } QWK\6  
   for(int index=0;index<MAX_KEY;index++){ }h\]0'S~J~  
    if(hCallWnd[index]==NULL) 4&E &{<;  
     continue; p,#**g:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) e&=T`  
    { 5U/C 0{6  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Il<ezD{  
     bProcessed=TRUE; \J{ %xW>  
    } =]sM,E,n  
   } 4)d#dy::\  
  } .A <n2-  
  else if((lParam&0xc000ffff)==1){ //有键按下 ':T6m=yv  
   switch(wParam) TfFH!1^+  
   { %>:d5"&Lbs  
    case VK_MENU: m?<5-"hz  
     MaskBits|=ALTBIT; &$_#{?dPt  
     break; P.]O8r  
    case VK_CONTROL: D-\z'gS  
     MaskBits|=CTRLBIT; {>>Gc2UT  
     break; x% Eu.jj  
    case VK_SHIFT: p87VJ}  
     MaskBits|=SHIFTBIT; <(2,@_~@r  
     break; 'FGf#l<  
    default: //judge the key and send message OW8"7*irT  
     break; bA3pDt).p  
   } -8,lXrH  
   for(int index=0;index<MAX_KEY;index++){ {K+]^M  
    if(hCallWnd[index]==NULL) 4 O~zkg  
     continue; LXcH<)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ,W~a%8*  
    {  Q ,)}t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); VtC1TZ3-7  
     bProcessed=TRUE; 1$ ~W~O  
    } 9\W }p\c  
   } ]!04L}hy|P  
  } @K.[;-;g  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 GOhGSV#  
   for(int index=0;index<MAX_KEY;index++){ rz3!0P!"K  
    if(hCallWnd[index]==NULL) Fm{`?!  
     continue; [1gWc`#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <eG8xC  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); uWKc .  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 or1D 6 *'  
   } <xQHb^:  
  } g{?]a'?  
 } _ Tj`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Z &R{jQ,  
} 1]vrpJw  
uyITUvPg[  
  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: m;d#*}n\p  
7'9~Kx&+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Iz<}>J B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IT_Fs|$  
5%n  
  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: W{2(fb  
i0-zGEMB.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) X}$uvB}+>  
{ [#emm1k  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 3<nd;@:-  
 { NbtNu$%t  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 h&}XG\ioNA  
  SaveBmp(); F7zBm53  
  return FALSE; 4^mpQ.]lO  
 } Cp 2$I<T  
 …… //其它处理及默认处理 @< @\CiM  
} ^q0Ox&X  
$pm5G} .  
Z@I.socA  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 k6vY/)-S  
v&GBu  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 8s_'tw/{  
ovn)lIs  
  二、编程步骤 3tlA! e  
."m2/Ks7  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; hDJ84$eVZ  
E%vG#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <|'C|J_!  
cR+9^DzA  
  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; b^Xq(q>5  
HJ2r~KIw  
  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; P]4C/UDS-~  
BtN@P23>k.  
  5、 添加代码,编译运行程序。 )wROPA\uA  
> ^b6\  
三、程序代码  OBCRZ   
4M&6q(389  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL M"eiKX  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ytXXZ`  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4EiEE{9V  
#if _MSC_VER > 1000 N| dwuBW  
#pragma once BEkxH.   
#endif // _MSC_VER > 1000 ]_yk,}88d  
#ifndef __AFXWIN_H__ 9 L{JU  
#error include 'stdafx.h' before including this file for PCH NyTv~8A`)  
#endif #Cda8)jl(  
#include "resource.h" // main symbols G#&R/Tc5N  
class CHookApp : public CWinApp 5};Nv{km^2  
{ )kSE5|:pi  
 public: b=!G3wVw<  
  CHookApp(); mV0.9pxS  
  // Overrides p}j$p'D.RI  
  // ClassWizard generated virtual function overrides n)(E 0h  
  //{{AFX_VIRTUAL(CHookApp) 4{d!}R  
 public: p<\yp<g  
  virtual BOOL InitInstance(); `4& GumG  
  virtual int ExitInstance(); (0Xgv3wd  
  //}}AFX_VIRTUAL U!L<v!$  
  //{{AFX_MSG(CHookApp) e?%Qv+)W  
  // NOTE - the ClassWizard will add and remove member functions here. =Zcbfo_&  
  // DO NOT EDIT what you see in these blocks of generated code ! $4\,a^  
  //}}AFX_MSG ]C =+  
  DECLARE_MESSAGE_MAP() &xlz80%  
}; *OT6)]|k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); YH( 54R  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z (,%<oX  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); VemgG)\  
BOOL InitHotkey(); fT-yY`  
BOOL UnInit(); e5_:15%R\  
#endif tc%?{W\  
}>\+eG  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. %G& Zm$u=  
#include "stdafx.h" }kaU0 P  
#include "hook.h" = X?jId{  
#include <windowsx.h> s5X .(;+  
#ifdef _DEBUG \7QAk4I~  
#define new DEBUG_NEW R<+K&_  
#undef THIS_FILE ]:B|_| H  
static char THIS_FILE[] = __FILE__; jOppru5U  
#endif H[ DrG6GA  
#define MAX_KEY 100 T.vkGB=QZ%  
#define CTRLBIT 0x04 @3/.W+  
#define ALTBIT 0x02 6@TGa%:G  
#define SHIFTBIT 0x01 $\xS~ w  
#pragma data_seg("shareddata") ewYZ} "o  
HHOOK hHook =NULL; T/#$44ub  
UINT nHookCount =0; HF9d~7R  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ;Zb+WGyj  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT IiG~l+V~  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ^Tbw#x]2  
static int KeyCount =0; )E<<  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift 1>$ fLbmkI  
#pragma data_seg() 6>! ;g'k  
HINSTANCE hins; ho#]i$b}f2  
void VerifyWindow(); MXWCYi  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ;Jex#+H(:D  
//{{AFX_MSG_MAP(CHookApp) V&x6ru#  
// NOTE - the ClassWizard will add and remove mapping macros here. 2 w2JFdm  
// DO NOT EDIT what you see in these blocks of generated code! Dz4fP;n  
//}}AFX_MSG_MAP ~ l~ai>/  
END_MESSAGE_MAP() L3^WI( 8m  
Fh u(u  
CHookApp::CHookApp() t =ErJ  
{ LEoL6ga  
 // TODO: add construction code here, N`7) 88>w  
 // Place all significant initialization in InitInstance FpjpsD~ Qu  
} **L. !/  
6mr5`5~w  
CHookApp theApp; d^"<Tz!  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2<jbNnj  
{ KXEDpr  
 BOOL bProcessed=FALSE; ~U+SK4SK:o  
 if(HC_ACTION==nCode) rmj?jBKQU  
 { d Ybb>rlu  
  if((lParam&0xc0000000)==0xc0000000){// Key up ^lCys  
   switch(wParam) ?Xscc mN  
   { c!Gnd*!?-  
    case VK_MENU: <(rf+Ou>I  
     MaskBits&=~ALTBIT; -I7"9}j3  
     break; -,NiSh}A  
    case VK_CONTROL: 1s4+a^ &  
     MaskBits&=~CTRLBIT; u 9Wi@sO#  
     break; 4-@D`,3L  
    case VK_SHIFT: Z `FqC  
     MaskBits&=~SHIFTBIT; m&xyw9a  
     break; Ti`H?9t  
    default: //judge the key and send message ` V}e$  
     break; \'I->O]  
   } .80^c  
   for(int index=0;index<MAX_KEY;index++){ sFaboI  
    if(hCallWnd[index]==NULL) D~W1["[  
     continue; ~ow_&ftlo  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) D6 B(6 5Y  
    { I%]L  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $Il?[4FF  
     bProcessed=TRUE; ~Aul 7[IH  
    } ^mbpt`@  
   } JAM4 R_  
  } ndEW$?W,  
  else if((lParam&0xc000ffff)==1){ //Key down 1PLxc)LsG  
   switch(wParam) < &[=,R0 @  
   { FZTBvdUYp  
    case VK_MENU: *I 7$\0Q  
     MaskBits|=ALTBIT; dx{ZG'@aH  
     break; HY[eo/nM1d  
    case VK_CONTROL: {U?UM  
     MaskBits|=CTRLBIT; 1DPgiIG~  
     break; $y~!ePKh  
    case VK_SHIFT: i,jPULzyjk  
     MaskBits|=SHIFTBIT; B\BxF6 y  
     break; kWs"v6B  
    default: //judge the key and send message ;2X/)sxWz  
     break; h^#K4/  
   } 5(kRFb'31F  
   for(int index=0;index<MAX_KEY;index++) ajFSbi)l  
   { :|i jCg+  
    if(hCallWnd[index]==NULL) umV5Y`  
     continue; S EdNH.|I  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7XLz Ewa  
    { 6@_Vg~=S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); g:bw;6^ u  
     bProcessed=TRUE; ^M60#gJ  
    } W#1t%hT$  
   } n~xh %r;  
  } dQ+{Dv3A  
  if(!bProcessed){ /L,VZ?CmtK  
   for(int index=0;index<MAX_KEY;index++){ `* !t<?$i  
    if(hCallWnd[index]==NULL) |/B2Bm  
     continue; i}mvKV?!|1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (~t/8!7N  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ^|KX)g  
   } Y'6GY*dL  
  } /8 /2#`3R  
 } ptXCM[Z+  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .<8kDyi m  
} S`ms[^-q*  
J6}J/  
BOOL InitHotkey() ^b-o  
{ -DgJkyt+<  
 if(hHook!=NULL){ gGl}~  
  nHookCount++; Zr`pOUk!4  
  return TRUE; 871taL=  
 } J{Fu8  
 else r|[uR$|Y  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); (xnXM}M&2Y  
  if(hHook!=NULL) e-vwve  
   nHookCount++; tjw4.L<r  
  return (hHook!=NULL); 78't"2>  
} Ar@" K!TS  
BOOL UnInit() 6{/HNEI*1  
{ =1' / ?  
 if(nHookCount>1){ C^>txui8  
  nHookCount--; f"emH  
  return TRUE; -:w+`x?XaB  
 } sYlA{Z"  
 BOOL unhooked = UnhookWindowsHookEx(hHook); fN4d^0&  
 if(unhooked==TRUE){ 9\F:<Bf$#  
  nHookCount=0; *^cJn*QeL  
  hHook=NULL; Z["[^=EP  
 } -z"=d<@  
 return unhooked; 8RS=Xemds  
} sBozz#  
MH;5gC@ `  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) Nrp0z:  
{ h`X>b/V  
 BOOL bAdded=FALSE; rp*f)rJ  
 for(int index=0;index<MAX_KEY;index++){ }%z {tn  
  if(hCallWnd[index]==0){ ,dhSc<:LT  
   hCallWnd[index]=hWnd; aYIAy]*1e  
   HotKey[index]=cKey; 5$C4Ui{<E'  
   HotKeyMask[index]=cMask; pF~[  
   bAdded=TRUE; \nQV{J  
   KeyCount++; rdK=f<I]  
   break; bDh,r!I  
  } j*uc$hC"  
 } FbxrBM  
 return bAdded; 7GN>o@t  
} G$b*N4yR  
Y*!J +A#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) [ 0? *J<d  
{ t?& a?6:J  
 BOOL bRemoved=FALSE;  j6zZ! k  
 for(int index=0;index<MAX_KEY;index++){ ;| (_;d  
  if(hCallWnd[index]==hWnd){ Ja$Ple*XU8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u=epnz:<  
    hCallWnd[index]=NULL; EJF*_<f9O  
    HotKey[index]=0; (8bo"{zI  
    HotKeyMask[index]=0; zoFCHs r  
    bRemoved=TRUE; O3Jp:.ps  
    KeyCount--; u} y)'eH  
    break; Qx$C oY  
   } lFHj]%Y  
  } }= )  
 } +k@$C,A  
 return bRemoved; `/WX!4eR,  
} @.JhL[f  
:Taequk  
void VerifyWindow() 6 w"-&  
{ +4<Ij/}p  
 for(int i=0;i<MAX_KEY;i++){ &~ =q1?  
  if(hCallWnd!=NULL){ 8T3j/ D<r  
   if(!IsWindow(hCallWnd)){ 3vs;ZBM  
    hCallWnd=NULL; lJe=z  
    HotKey=0; .W>LsEk  
    HotKeyMask=0; K x7'm1  
    KeyCount--; \\\%pBT7]\  
   } $JH_  
  } #0yU K5J  
 } *{}Y :  
} xW`,@a }  
Tnw0S8M  
BOOL CHookApp::InitInstance() Xi^#F;@sU  
{ y]dA<d?u  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); lRIS&9vA3  
 hins=AfxGetInstanceHandle(); 6rBXC <Z  
 InitHotkey(); #;l~Y}7'  
 return CWinApp::InitInstance(); 9d4Agj M  
} 0~.OMG:=  
x  RV@ _  
int CHookApp::ExitInstance() }Xn5M&>?  
{ !1g2'  
 VerifyWindow(); <,r(^Ntz  
 UnInit(); G}MJWf Hl  
 return CWinApp::ExitInstance(); l$j/Ye]  
} f$\gm+&hXE  
qXI>x6?*  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file JqX+vRY;dd  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) XeGtge/}T  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ /wF*@/PTH  
#if _MSC_VER > 1000 )U>JFgpIW  
#pragma once W$E!}~Ro  
#endif // _MSC_VER > 1000 )0RznFJ+X  
JYE[ 1M  
class CCaptureDlg : public CDialog v61'fQ1Qg!  
{ 3_AVJv ;N  
 // Construction &W'X3!Te  
 public: ?8{x/y:  
  BOOL bTray; K6C@YY(  
  BOOL bRegistered;  BKiyog  
  BOOL RegisterHotkey(); ukZ>_ke`+  
  UCHAR cKey; ]<9KX} B  
  UCHAR cMask; Wmm'j&hI  
  void DeleteIcon(); m^6& !`CD  
  void AddIcon(); 1Wz -Z  
  UINT nCount; o.)8  A8  
  void SaveBmp(); s>A!Egmo  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ;QRnZqSv  
  // Dialog Data SHc<`M'+  
  //{{AFX_DATA(CCaptureDlg) #osP"~{  
  enum { IDD = IDD_CAPTURE_DIALOG }; z2EZ0vZ  
  CComboBox m_Key; -d|Q|zF^x  
  BOOL m_bControl; G;^},%<  
  BOOL m_bAlt; {$dq7m(  
  BOOL m_bShift; tEj-c@`"x-  
  CString m_Path; YPq4VX,  
  CString m_Number; O.ce"5Y^  
  //}}AFX_DATA C`p)S`d  
  // ClassWizard generated virtual function overrides BtPUUy.  
  //{{AFX_VIRTUAL(CCaptureDlg) 7q%<JZPY  
 public: !uoQLiH+  
  virtual BOOL PreTranslateMessage(MSG* pMsg); zvzS$Gpe  
 protected: $]{20"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support XN*?<s3  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 9:JFG{M  
  //}}AFX_VIRTUAL .Mn+Bd4f  
  // Implementation c^4^z"Mo`  
 protected: qHAZ)Tz  
  HICON m_hIcon; (wMiX i  
  // Generated message map functions fV 6$YCf  
  //{{AFX_MSG(CCaptureDlg) R{GT? wl  
  virtual BOOL OnInitDialog();  `PV+.V}  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); P|:*OM p  
  afx_msg void OnPaint(); NXJyRAJ*%  
  afx_msg HCURSOR OnQueryDragIcon(); M[;N6EJH  
  virtual void OnCancel(); -zzM!1@F  
  afx_msg void OnAbout(); vf |lF9@U  
  afx_msg void OnBrowse(); DE0gd ux8  
  afx_msg void OnChange(); /Ir|& <yB  
 //}}AFX_MSG * KDT0;/s  
 DECLARE_MESSAGE_MAP() vP_V%5~yN  
}; rh8.kW-K_  
#endif L\:f#b~W  
S%+$  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ?8j#gYx2  
#include "stdafx.h" x/7d!>#;  
#include "Capture.h" kLr6j-X  
#include "CaptureDlg.h" 8Wa&&YTB  
#include <windowsx.h> j:JM v  
#pragma comment(lib,"hook.lib") r]C`#  
#ifdef _DEBUG S$=e %c  
#define new DEBUG_NEW TQcEe@$)  
#undef THIS_FILE =:|fN3nJ2  
static char THIS_FILE[] = __FILE__; 4\#!Gv-  
#endif \:ELO[(#|{  
#define IDM_SHELL WM_USER+1 C< :F<[H  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); [i8,rOa7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); #^\q Fj  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ar+<n 2;[  
class CAboutDlg : public CDialog LX i?FQnLu  
{ c|kQ3(  
 public: +<^TyIJ0  
  CAboutDlg(); QO'=O}e  
  // Dialog Data % d%KH9u  
  //{{AFX_DATA(CAboutDlg) q ;@:,^  
  enum { IDD = IDD_ABOUTBOX }; 208dr*6U  
  //}}AFX_DATA 6l{=[\.Xa  
  // ClassWizard generated virtual function overrides j3!]wolY  
  //{{AFX_VIRTUAL(CAboutDlg) N|pyp*8Z  
 protected: jslfq@5v  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 5y}kI  
  //}}AFX_VIRTUAL ?~mw  
  // Implementation -rEg(@S %  
 protected: L @b8,  
  //{{AFX_MSG(CAboutDlg) `7;I*|  
  //}}AFX_MSG &"90pBGK  
  DECLARE_MESSAGE_MAP() oNgu- &  
}; O_PKS$sz{  
.ZK|%VGW  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) g@&@ ]63  
{ ..ig jc#UF  
 //{{AFX_DATA_INIT(CAboutDlg) 1I#S?RSb  
 //}}AFX_DATA_INIT wYf9&}k\4  
} =4;GIiF@  
]"Do%<  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) q><E?  
{ nDR)UR  
 CDialog::DoDataExchange(pDX); }tH$/-qnJE  
 //{{AFX_DATA_MAP(CAboutDlg) D@Zb|EI%<  
 //}}AFX_DATA_MAP E57J).x-BP  
} l!B)1  
zU+` o?al  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 4eSV( u)4  
 //{{AFX_MSG_MAP(CAboutDlg) VfJbexYT  
 // No message handlers eBD7g-  
 //}}AFX_MSG_MAP 5"f')MKUV9  
END_MESSAGE_MAP() lP@/x+6tg  
\78w1Rkl  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) IC-k  
: CDialog(CCaptureDlg::IDD, pParent) zc<C %t[~y  
{ [Z3B~c  
 //{{AFX_DATA_INIT(CCaptureDlg) I_Q*uH.Y5  
  m_bControl = FALSE; q@;z((45  
  m_bAlt = FALSE; =] R_6#  
  m_bShift = FALSE; R<}Yf[TQ  
  m_Path = _T("c:\\"); bDLPA27  
  m_Number = _T("0 picture captured."); C~4$A/&(  
  nCount=0; C|kZT<,]  
  bRegistered=FALSE; Q\H_lB  
  bTray=FALSE; : "[dr~.  
 //}}AFX_DATA_INIT V 0<>Xo%  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 HvWnPh1l  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); qTA@0fL  
} M(,npW  
8ODrW!o  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) MQR@(>TZy  
{ DrD68$,QN  
 CDialog::DoDataExchange(pDX); zOR  
 //{{AFX_DATA_MAP(CCaptureDlg) ^L&hwXAO:  
  DDX_Control(pDX, IDC_KEY, m_Key); u!([m; x|  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); tUXq!r<'dT  
  DDX_Check(pDX, IDC_ALT, m_bAlt); @u./VK  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); UR~9*`Z ,  
  DDX_Text(pDX, IDC_PATH, m_Path); sR`WV6!9  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ,B>Rc#  
 //}}AFX_DATA_MAP kLKd O0  
} lNSB "S  
,:!X]F#d$  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $ctY#:;pV{  
//{{AFX_MSG_MAP(CCaptureDlg) XgUvgJ  
 ON_WM_SYSCOMMAND() y0Pr[XZ  
 ON_WM_PAINT() 56Q9RU(M  
 ON_WM_QUERYDRAGICON() /? n 9c;w  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) &xF 2!t`  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) J[:3H6%`  
 ON_BN_CLICKED(ID_CHANGE, OnChange) RVmD&  
//}}AFX_MSG_MAP oWVlHAPj  
END_MESSAGE_MAP() !$'s?rnh  
Az2HlKF"L  
BOOL CCaptureDlg::OnInitDialog() PjEKZHHz  
{ c43" o  
 CDialog::OnInitDialog(); f!}c0nb  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); .'Vjs2 2  
 ASSERT(IDM_ABOUTBOX < 0xF000); ]p(jL7  
 CMenu* pSysMenu = GetSystemMenu(FALSE); :('7ly!h  
 if (pSysMenu != NULL) YX+Da"\  
 { jP6;~[rl  
  CString strAboutMenu; L 6){wQ%c  
  strAboutMenu.LoadString(IDS_ABOUTBOX); a_5`9BL  
  if (!strAboutMenu.IsEmpty()) zmI?p4,  
  { ^'DrU< o  
   pSysMenu->AppendMenu(MF_SEPARATOR); p1p4t40<l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); %J\1W"I?  
  } T!o 4k  
 } 2RD os#  
 SetIcon(m_hIcon, TRUE); // Set big icon K#g)t/SZ  
 SetIcon(m_hIcon, FALSE); // Set small icon F kas*79  
 m_Key.SetCurSel(0); P)~PrTa%  
 RegisterHotkey(); ,,r%Y&:`6  
 CMenu* pMenu=GetSystemMenu(FALSE); SGMLs'D   
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Pg%OFhA  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,D-VC{lj  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); V)\|I8"  
 return TRUE; // return TRUE unless you set the focus to a control Y418k  
} 5Bw  
o >{+vwK  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) j'i-XIs  
{ G0$ 1"9u\w  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 6vz9r)L  
 { ni gp83:  
  CAboutDlg dlgAbout; Qh-k[w0  
  dlgAbout.DoModal(); Ow=`tv$l  
 } 5:SfPAx  
 else 6Gjr8  
 { J ?$4Yf  
  CDialog::OnSysCommand(nID, lParam); Zk2-U"0\o  
 } V 0R;q  
} pLL ^R  
kEWC  
void CCaptureDlg::OnPaint() ;<%~g8:XL  
{ ]>K%,}PS  
 if (IsIconic()) 39?iX'*p  
 { )` S,vF~  
  CPaintDC dc(this); // device context for painting X""<5s'0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); |{]\n/M  
  // Center icon in client rectangle (`gqLPx[  
  int cxIcon = GetSystemMetrics(SM_CXICON); 2#5SI  
  int cyIcon = GetSystemMetrics(SM_CYICON); }NDw3{zn  
  CRect rect; @Y*ONnl  
  GetClientRect(&rect); a;m-Vu!  
  int x = (rect.Width() - cxIcon + 1) / 2; YS k,kU  
  int y = (rect.Height() - cyIcon + 1) / 2; 3]0ETcT  
  // Draw the icon {$4fRxj  
  dc.DrawIcon(x, y, m_hIcon); Z2`(UbG}  
 } :<Y,^V(  
 else Z<z(;)?c  
 { Z6SM7? d  
  CDialog::OnPaint(); %v:9_nwO)  
 } ge?1ez2  
} w<N [K>  
"#d}S)GlXM  
HCURSOR CCaptureDlg::OnQueryDragIcon() # 9Z];<g  
{ RvvK`}/6  
 return (HCURSOR) m_hIcon; ?n>h/[/  
} >F6'^9|  
He. gl  
void CCaptureDlg::OnCancel() ZffK];D  
{ Z ) qc-~S  
 if(bTray) j*<H18^G  
  DeleteIcon(); Hn0 ,LH$/  
  CDialog::OnCancel(); LHKawEZ  
} yb56nd  
qYZX, x  
void CCaptureDlg::OnAbout() {e0cc1Up}  
{ 6<.Ma7)lA  
 CAboutDlg dlg; X a#`VDh  
 dlg.DoModal(); ^k]OQc7q'  
} >7B6iR6N  
Eic/#j{4  
void CCaptureDlg::OnBrowse() D`,W1Z#  
{ J7/"8S_#N  
 CString str; Ly/"da  
 BROWSEINFO bi; c?"#x-<1s  
 char name[MAX_PATH]; u)y6$  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); w4<1*u@${  
 bi.hwndOwner=GetSafeHwnd(); 4*d$o=wa  
 bi.pszDisplayName=name; r ,D T>  
 bi.lpszTitle="Select folder"; Z\D!'FX  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; AK%`EsI^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); puA~}6C  
 if(idl==NULL) i[sHPEml(5  
  return; $3zs?Fd`  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); }p$>V,u  
 str.ReleaseBuffer(); R$k4}p  
 m_Path=str; pca `nN!  
 if(str.GetAt(str.GetLength()-1)!='\\') 1[OCojo<  
  m_Path+="\\"; C|bnUN  
 UpdateData(FALSE); n=WwB(}q  
} C;];4[XR  
Pky/fF7e  
void CCaptureDlg::SaveBmp() /J )MW{;O  
{ Q^>"AhOiU  
 CDC dc; <]xGd!x$  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 9`]Gosz  
 CBitmap bm; pyYm<dn  
 int Width=GetSystemMetrics(SM_CXSCREEN); 1`J-|eH=Q  
 int Height=GetSystemMetrics(SM_CYSCREEN); ;NQ9A &$)  
 bm.CreateCompatibleBitmap(&dc,Width,Height); dU<\ FW_  
 CDC tdc; "c` $U]M%  
 tdc.CreateCompatibleDC(&dc); k#X~+}N^  
 CBitmap*pOld=tdc.SelectObject(&bm); 8Yc'4v#}  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~o_0RB  
 tdc.SelectObject(pOld); kk#%x#L[  
 BITMAP btm; yIy'"BCxM  
 bm.GetBitmap(&btm); E7X6Shng  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; uNSaw['0j  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5IE3[a%X  
 BITMAPINFOHEADER bih; l\g>@b  
 bih.biBitCount=btm.bmBitsPixel; 2-=Ov@y2k!  
 bih.biClrImportant=0; t66Cx  
 bih.biClrUsed=0; +9Q,[)e r  
 bih.biCompression=0; 36"-cGNr{  
 bih.biHeight=btm.bmHeight; HR'sMu3  
 bih.biPlanes=1; -i93  
 bih.biSize=sizeof(BITMAPINFOHEADER); VF[$hs  
 bih.biSizeImage=size; 0x BO5[w,Y  
 bih.biWidth=btm.bmWidth; HXV4E\JA  
 bih.biXPelsPerMeter=0; vDI$ QUMD6  
 bih.biYPelsPerMeter=0; @A32|p}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); d8D028d  
 static int filecount=0; h;" 9.  
 CString name; I<E~=  
 name.Format("pict%04d.bmp",filecount++); wr);+.T9R  
 name=m_Path+name; ZtHTl\z  
 BITMAPFILEHEADER bfh; 4^uQB(}Z  
 bfh.bfReserved1=bfh.bfReserved2=0; >_XC  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 5<64 C}fE3  
 bfh.bfSize=54+size; k-it#'ll{x  
 bfh.bfOffBits=54; |m{u]9  
 CFile bf; H!SFSgAu  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ Yzr)UJl*I  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,f*Q3 S/I  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); H@, h$$  
  bf.WriteHuge(lpData,size); |WP}y- Au  
  bf.Close(); Ymvd3>_  
  nCount++; zTBf.A;e7  
 } wWkMvs  
 GlobalFreePtr(lpData); KC+jHk  
 if(nCount==1) t;HM  
  m_Number.Format("%d picture captured.",nCount); !d.bCE~  
 else ^cDHC^Wm  
  m_Number.Format("%d pictures captured.",nCount); 7q%xF#mK=  
  UpdateData(FALSE); 33},lNS|  
} k\76`!B  
OsT|MX  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) B6kc9XG  
{ ,,G[360  
 if(pMsg -> message == WM_KEYDOWN) MCO2(E-  
 { y5{Vx{V"Q  
  if(pMsg -> wParam == VK_ESCAPE) \>$3'i=mQ  
   return TRUE; C'7DG\pr  
  if(pMsg -> wParam == VK_RETURN) *fCmZ$U:{  
   return TRUE; % * k`z#b  
 } ;rRV=$y  
 return CDialog::PreTranslateMessage(pMsg); @}\i`H1s  
} =u-q#<h4 ;  
~pT1,1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j-cp  
{ 9-+N;g!q  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ JIiS/]KQ  
  SaveBmp(); F|jl=i  
  return FALSE; =Y-.=}jp;  
} \,xa_zeO  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ S6g_$ Q7  
 CMenu pop; ^H0#2hFa  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >PzZt8e  
 CMenu*pMenu=pop.GetSubMenu(0); ,!40\"A  
 pMenu->SetDefaultItem(ID_EXITICON); n:[@#xs-  
 CPoint pt; k|,Y_h0Y  
 GetCursorPos(&pt); -7KoR}Ck!  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); kRjNz~g  
 if(id==ID_EXITICON) }Y^o("c(  
  DeleteIcon(); Aydpr_lp  
 else if(id==ID_EXIT) WG&! VK  
  OnCancel(); to'CuPkT  
 return FALSE; d#OAM;0}5  
} k;B[wEW@  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n2 can  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) g >@a  
 AddIcon(); h'HI92; [  
 return res; ?7]G )8G6  
} 3G[|4v?[<_  
{+m8^-T  
void CCaptureDlg::AddIcon() xG;;ykh.]  
{ LZb<-vK"y  
 NOTIFYICONDATA data; 'ieTt_1.G  
 data.cbSize=sizeof(NOTIFYICONDATA); ufe |I  
 CString tip; wz)s  
 tip.LoadString(IDS_ICONTIP); aAbA)'G  
 data.hIcon=GetIcon(0); DZ @B9<Zz{  
 data.hWnd=GetSafeHwnd(); 6J\ 2 =c`  
 strcpy(data.szTip,tip); )Q62I\  
 data.uCallbackMessage=IDM_SHELL; kia[d984w  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; Wsgp#W+  
 data.uID=98; o l41%q*  
 Shell_NotifyIcon(NIM_ADD,&data); 'pT13RFD  
 ShowWindow(SW_HIDE); Yj'9|4%+|  
 bTray=TRUE; c~4Cpy^  
} w\MWr+4  
B~E">}=!  
void CCaptureDlg::DeleteIcon() .^M#BAt2  
{ ,p3]`MG  
 NOTIFYICONDATA data; >DUTmJxv  
 data.cbSize=sizeof(NOTIFYICONDATA); SswcO9JCX3  
 data.hWnd=GetSafeHwnd(); bf@g*~h@  
 data.uID=98; IIih9I`IR  
 Shell_NotifyIcon(NIM_DELETE,&data); ZG 0^O"B0  
 ShowWindow(SW_SHOW); .8Bu%Sf  
 SetForegroundWindow(); .;Mb4"7=  
 ShowWindow(SW_SHOWNORMAL); "9r$*\wOf  
 bTray=FALSE; q01 L{~>bz  
} :o' |%JE  
l;KrFJ6  
void CCaptureDlg::OnChange() L {P'mG=4  
{ .Sn{a }XP4  
 RegisterHotkey(); U+*l!"O,  
} S9Oz5_x  
'5 Yzo^R;  
BOOL CCaptureDlg::RegisterHotkey() u 3#+fn_  
{ R;!@ xy  
 UpdateData(); \?]U*)B.r  
 UCHAR mask=0; (_|*&au J  
 UCHAR key=0; 'KIT^k0"Ih  
 if(m_bControl) ]}PXN1(  
  mask|=4; l99Lxgx=  
 if(m_bAlt) CDM6o!ur3  
  mask|=2; ?5J# yn  
 if(m_bShift) x;)I%c  
  mask|=1; ~9 .=t'  
  key=Key_Table[m_Key.GetCurSel()]; 9c[X[ Qc  
 if(bRegistered){ z`IW[N7Z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 6`O,mpPu4G  
  bRegistered=FALSE; +Ps.HW#NY  
 } h\UKm|BZ  
 cMask=mask; F$)l8}  
 cKey=key; ,eBC]4)B6  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); /^AH/,p  
 return bRegistered; *0xL(  
} Ny2 Z <TW  
La )M  
  四、小结 y62f{ks_/  
V.&F%(L  
  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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