社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 7859阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: 6i~WcAs  
  Ez=Olbk  
  一、实现方法 # 4PVVu<  
ZJ[ ??=Gz  
  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: d<N:[Y\4l  
aAA U{EWW  
#pragma data_seg("shareddata") o.l- 7  
HHOOK hHook =NULL; //钩子句柄 e@OX_t_  
UINT nHookCount =0; //挂接的程序数目 Nu7 !8[?r*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 w*JGUk  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 9p2&) kb6  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey cjIh}:| '  
static int KeyCount =0; tC9n k5~  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 igR";OQk  
#pragma data_seg() /Mu @,)''  
A$:U'ZG_  
  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。 Np0u,t%vs  
^M>P:~  
  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: KMjhZap%  
v oj^pzZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \)?HJ  
cKey,UCHAR cMask) l2P=R)@{  
{ nQ,HMXj  
 BOOL bAdded=FALSE; hFl^\$Re  
 for(int index=0;index<MAX_KEY;index++){ 9j9TPyC/2  
  if(hCallWnd[index]==0){ X(-4<B  
   hCallWnd[index]=hWnd; ~O &:C{9=  
   HotKey[index]=cKey; )/?$3h;  
   HotKeyMask[index]=cMask; ?m? ::RH  
   bAdded=TRUE; 7{I0s;R  
   KeyCount++; /CG"]!2 "  
   break; ;x@~A^<el  
  } <?4V  
 } 8q}q{8  
 return bAdded; exUu7& *:  
} xjj6WED  
//删除热键 ?oHpFlj  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u($ !z^h  
{ k{SAvKx=  
 BOOL bRemoved=FALSE; d,n 'n  
 for(int index=0;index<MAX_KEY;index++){ &@Be2!%'9K  
  if(hCallWnd[index]==hWnd){ (c &mCJN  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ sI^Xb@'09$  
    hCallWnd[index]=NULL; DX K?Cv71z  
    HotKey[index]=0; <;Zmjeb+#  
    HotKeyMask[index]=0; (rm?jDm   
    bRemoved=TRUE; I75DUJqy]  
    KeyCount--; &AbNWtCV+G  
    break; -0x #  
   } \Et3|Iv  
  } oHn Ky[1  
 } =.]4;z  
 return bRemoved; SmSH2m-  
} e [mm  
6.nCV 0xA  
FSW_<%  
  DLL中的钩子函数如下: <+vw@M  
+Kbjzh3<wG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) _C[q4?  
{ F%D.zvKN  
 BOOL bProcessed=FALSE; 9H`XeQ.  
 if(HC_ACTION==nCode) |_aa&v~  
 { GH:jH]u!V  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 {go;C}  
   switch(wParam) Xg!{K3OS  
   {  MC.) 2B7  
    case VK_MENU: nwRc%C``UK  
     MaskBits&=~ALTBIT; V7fq4O^:  
     break; "Nbq#w\  
    case VK_CONTROL: 8(&[Rs?K  
     MaskBits&=~CTRLBIT; /zVOK4BqN+  
     break; B; h"lv  
    case VK_SHIFT: .jT#:_  
     MaskBits&=~SHIFTBIT; 9c,'k#k  
     break; XXcl{1Kp!@  
    default: //judge the key and send message Jgd'1'FOs  
     break; e_ANUll1  
   } P'[3Fqe  
   for(int index=0;index<MAX_KEY;index++){ EC!02S  
    if(hCallWnd[index]==NULL) Mc_YPR:C  
     continue; .Una+Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3E $f)  
    { 9BBmw(M}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Eq9x2  
     bProcessed=TRUE; DJ [#5h5  
    } nIy}#MUd|q  
   } Y}|X|!0x  
  } -23w2Qt  
  else if((lParam&0xc000ffff)==1){ //有键按下 >T3-  
   switch(wParam) :L@?2),  
   { l=)xo@6  
    case VK_MENU: n QZwC  
     MaskBits|=ALTBIT; , I (d6  
     break; /quc}"__  
    case VK_CONTROL: `yXg{lk  
     MaskBits|=CTRLBIT;  J^5So  
     break; e95Lo+:f  
    case VK_SHIFT: ?2{Gn-{  
     MaskBits|=SHIFTBIT; &LZn FR  
     break; {xB!EQ"  
    default: //judge the key and send message =I;ZMJR  
     break; Tc &z:  
   } zFw s:_ i  
   for(int index=0;index<MAX_KEY;index++){ oiT[de\S  
    if(hCallWnd[index]==NULL) j2.|ln"!  
     continue; {Y=WW7:Qx  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~{B7 k:  
    { ju8q?Nyhs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); MvHm)h  
     bProcessed=TRUE; A_ N;   
    } 0c'<3@39k|  
   } KNpl:g3{<Q  
  } yyRiP|hJ  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 '(yAfL 9}  
   for(int index=0;index<MAX_KEY;index++){ g:D>.lKd  
    if(hCallWnd[index]==NULL) |[ k.ii6iO  
     continue; ~>Fu5i $i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) (\hx` Yh=>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); i8[t=6Rm@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 0g y/:T  
   } %D}kD6=  
  } aweV#j(y  
 } {V$|3m>:*  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); D4-ifsP  
} O%zU-_|*  
Cc' 37~6~P  
  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: 8\ +T8(m  
G"U9E5O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); YYl4"l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ~tUl}  
kmsb hYM)  
  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: so)[59M7  
&5spTMw8  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ZQoU3AD;  
{ @qqg e'  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 6YLj^w] %  
 { 5k3b3&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 !&ayYu##{  
  SaveBmp(); bv9i*]  
  return FALSE; gG:Vt}N  
 } EQyC1j  
 …… //其它处理及默认处理 UkT=W!cq  
} T/Gz94c  
B^Nf #XN(  
p7VTa~\zA  
  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。 ~u!|qM  
J^nBdofP  
  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。 _8riUt  
]kG"ubHV?h  
  二、编程步骤 $@Rxrx_@M  
#ASz;$P  
  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"; U;V7 u/{  
lL3kh J:%  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; uK#4(eY=W  
dTC7Fm  
  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; ~xfP:[u  
7he,?T)vD  
  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; a 3b/e8c  
Lh"<XYY  
  5、 添加代码,编译运行程序。 f/NH:1)y  
|`Ntv }  
三、程序代码  |`f$tj  
}~j lj  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 1onM j  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) z8~NZ;A  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ \oXpi$  
#if _MSC_VER > 1000 +p_CN*10H  
#pragma once dh*ZKI^@(  
#endif // _MSC_VER > 1000 .b&t ;4q  
#ifndef __AFXWIN_H__ *_{j=sd  
#error include 'stdafx.h' before including this file for PCH [vK ^Um  
#endif YTpSHpf@  
#include "resource.h" // main symbols ;| 5F[  
class CHookApp : public CWinApp el<s8:lA  
{ Xe'x[(l  
 public: 9ni1f{k  
  CHookApp(); _476pZ_  
  // Overrides #$+*;  
  // ClassWizard generated virtual function overrides -M~:lK]n   
  //{{AFX_VIRTUAL(CHookApp) %lx!. G  
 public: Z{Qu<vy_  
  virtual BOOL InitInstance(); +I:Unp  
  virtual int ExitInstance(); cAqLE\h  
  //}}AFX_VIRTUAL %2/EaaR  
  //{{AFX_MSG(CHookApp) &yTqZ*Yuk  
  // NOTE - the ClassWizard will add and remove member functions here. }J`w4P  
  // DO NOT EDIT what you see in these blocks of generated code ! Lpz>>}  
  //}}AFX_MSG ,GIy q)  
  DECLARE_MESSAGE_MAP() `?qF$g9u~  
}; n;Q7X>-f8`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); K?Nhi^f"L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qI9z;_,gNz  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K5VWt)Z#  
BOOL InitHotkey(); m6K}|j  
BOOL UnInit(); 6NuD4Ga  
#endif S_4?K)n #  
,~$p,ALwN7  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ~ 'H ]jN  
#include "stdafx.h" n;C :0  
#include "hook.h" _|\~q[ep  
#include <windowsx.h> GPv1fearl  
#ifdef _DEBUG 82qoGSD.  
#define new DEBUG_NEW EHIF>@TZ  
#undef THIS_FILE wn, KY$/  
static char THIS_FILE[] = __FILE__; qzLPw*;  
#endif SC!RbW@3  
#define MAX_KEY 100  #ut  
#define CTRLBIT 0x04 AW'0,b`v  
#define ALTBIT 0x02 7~% ?#  
#define SHIFTBIT 0x01 3`|@H-c9  
#pragma data_seg("shareddata") G1tY)_-8[  
HHOOK hHook =NULL; 0c]/bs{}  
UINT nHookCount =0; vY}g<*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey t?&|8SId  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT \ gGW8Q;  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey Z'W =\rl  
static int KeyCount =0; KVaiugQ   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift VG#EdIiI  
#pragma data_seg() vjCu4+w($Z  
HINSTANCE hins; 3E]plj7$  
void VerifyWindow(); ^4hO  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Xp% v.M  
//{{AFX_MSG_MAP(CHookApp) "5!oi]@>(  
// NOTE - the ClassWizard will add and remove mapping macros here. uc\Kg1{  
// DO NOT EDIT what you see in these blocks of generated code! e@ 07  
//}}AFX_MSG_MAP hJ? O],4J  
END_MESSAGE_MAP() [`[|l  
^_W#+>&--  
CHookApp::CHookApp() aEWWP]  
{ 1Z2HUzqh.  
 // TODO: add construction code here, t+ G#{n  
 // Place all significant initialization in InitInstance A#<?4&  
} V>LwqS~`  
.},'~NM]  
CHookApp theApp; yNo0ubY  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) *W1dG#Np}  
{ ~?Pw& K2  
 BOOL bProcessed=FALSE;  RVmh6m  
 if(HC_ACTION==nCode) EU;9 *W<  
 { eHZws`W  
  if((lParam&0xc0000000)==0xc0000000){// Key up (@VMH !3  
   switch(wParam) 70nqD>M4  
   { L,`LN>  
    case VK_MENU: 5`  ~JPt  
     MaskBits&=~ALTBIT; 'ya{9EdlT  
     break; XJ\DVZ  
    case VK_CONTROL: ?4&e;83_#y  
     MaskBits&=~CTRLBIT; vWv"  
     break; rfJz8uF%  
    case VK_SHIFT: $6 9&O  
     MaskBits&=~SHIFTBIT; ,Vm < rK  
     break;  KC6.Fr{  
    default: //judge the key and send message c_pr  
     break; UHkMn  
   } N!=v4f  
   for(int index=0;index<MAX_KEY;index++){ Lv7(st%`  
    if(hCallWnd[index]==NULL) 3M7/?TMw{6  
     continue; H@>` F  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) i$#;Kpb`^  
    { 5H9z4-i x?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gPO}d  
     bProcessed=TRUE; ((;!<5-`s  
    } Eyqa?$R  
   } @n /nH?L  
  } 'sKk"bi;0  
  else if((lParam&0xc000ffff)==1){ //Key down $( kF#  
   switch(wParam) ]:-mbgW  
   { 0i>5<ej,f  
    case VK_MENU: k%#EEMh  
     MaskBits|=ALTBIT; "Gzz4D  
     break; lgy <?LI\  
    case VK_CONTROL: Lg.gfny[(t  
     MaskBits|=CTRLBIT; s^9Voi.y  
     break; Y\P8 v  
    case VK_SHIFT: I;(L%TT `  
     MaskBits|=SHIFTBIT; 7Q9 w?y~c  
     break; [ l??A3G  
    default: //judge the key and send message 9;u@q%;!k  
     break; ?e4YGOe.  
   } t%)7t9j  
   for(int index=0;index<MAX_KEY;index++) @b%=H/5\  
   { bsli0FJSh'  
    if(hCallWnd[index]==NULL) _J#zY- j  
     continue; lfgq=8d  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) |syR6(U}  
    { .`H5cuF`  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); lrE5^;/s1  
     bProcessed=TRUE; 8/#A!Ww]  
    } Pmx -8w  
   } )2o?#8J  
  } h7oo7AP  
  if(!bProcessed){ pah'>dAL  
   for(int index=0;index<MAX_KEY;index++){ t!l&iVWs  
    if(hCallWnd[index]==NULL)  |>^JRx  
     continue; SKN`2hD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /36:ms A  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); G~a ZJ,  
   } Dx?,=~W9  
  } JXQO~zj  
 } Ll't>)  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); qInR1r<  
} 9W5lSX#^;  
CK@@HSm}l  
BOOL InitHotkey() WpP}stam/  
{ V f&zL Sgr  
 if(hHook!=NULL){ "HIRTE;&  
  nHookCount++; O0v}43J [  
  return TRUE; PFjL1=7I  
 } 9$w.9`Py  
 else qe#tj/aZ  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 0[(8   
  if(hHook!=NULL) ? OM!+O  
   nHookCount++; 1CZgb   
  return (hHook!=NULL); TIDO@NwF  
} Wn2NMXK  
BOOL UnInit() @Nx 9)  
{ hn@08t G  
 if(nHookCount>1){ cV6D<,)  
  nHookCount--; KV *#T20T  
  return TRUE; .`eN8Dl1  
 } Dz/ "M=  
 BOOL unhooked = UnhookWindowsHookEx(hHook); T!#GW/?  
 if(unhooked==TRUE){ + &Eqk  
  nHookCount=0; YD6'#(  
  hHook=NULL; (w3YvG.  
 } 2/^3WY1U  
 return unhooked; </z Eg3F\  
} C,r;VyW6BI  
<%eG:n,#  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) U8?mc  
{ d7upz]K9g  
 BOOL bAdded=FALSE; [z{1*Xc  
 for(int index=0;index<MAX_KEY;index++){ g! |kp?  
  if(hCallWnd[index]==0){ =dKtV.L  
   hCallWnd[index]=hWnd; _B<X`L =  
   HotKey[index]=cKey; rb.N~  
   HotKeyMask[index]=cMask; $U WZDD  
   bAdded=TRUE; 6bC3O4Rw  
   KeyCount++; _`T_">9r  
   break;  }my`K  
  } S,UDezxg  
 } v!5 `|\  
 return bAdded; XRi8Gpg  
} m:2^= l4  
NXrlk  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) CD~.z7,LC  
{ >kVz49j  
 BOOL bRemoved=FALSE; &h/X ku&0  
 for(int index=0;index<MAX_KEY;index++){ a`>B Ly5o  
  if(hCallWnd[index]==hWnd){ U5de@Y  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ DvvK^+-~  
    hCallWnd[index]=NULL; GD$l| |8  
    HotKey[index]=0; )y$(AJx$  
    HotKeyMask[index]=0; #"~<HG}bR/  
    bRemoved=TRUE; y<Ot)fa$  
    KeyCount--; ~c `l@:  
    break; 5 7c8xk[.2  
   } q/,O\,  
  } X \/#@T  
 } NBGH_6DROw  
 return bRemoved; kuP(r  
} sXPe/fWo  
)SGq[B6@I  
void VerifyWindow() ?Uo BV$  
{ rx|pOz,:  
 for(int i=0;i<MAX_KEY;i++){ 4kx N<]  
  if(hCallWnd!=NULL){ 9yP;@y*d  
   if(!IsWindow(hCallWnd)){ 'H;*W|:-]  
    hCallWnd=NULL; @o`AmC . 8  
    HotKey=0; L!xi  
    HotKeyMask=0; Gd85kY@w7  
    KeyCount--; gcT%c|.  
   } ?Ir:g=RP*  
  } ;4\;mmLVk  
 } &6VnySE?  
} P&Vv/D  
nu%*'.  
BOOL CHookApp::InitInstance() wibNQ`4k  
{ cvL;3jRo  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); s~X%Y<9l  
 hins=AfxGetInstanceHandle(); =I_'.b  
 InitHotkey(); cr;da)  
 return CWinApp::InitInstance(); tCt#%7J;a  
} eaU  
p`qgrI`  
int CHookApp::ExitInstance() ?:0Jav  
{ M o|2}nf  
 VerifyWindow(); BI@[\aRLQ  
 UnInit(); $ I?"lky  
 return CWinApp::ExitInstance(); >A"(KSNL  
} pQB."[n  
%xLh Z\  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xAm6BB c  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) Ny/MJ#Lq  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ $F.a><1rY  
#if _MSC_VER > 1000 [$UI8tV  
#pragma once dM@1l1h/  
#endif // _MSC_VER > 1000 J{G?-+`  
@H8EWTZ  
class CCaptureDlg : public CDialog s eJ^s@H5l  
{ {' H(g[k  
 // Construction \  Cj7k^  
 public: f|g g  
  BOOL bTray; aN3;`~{9  
  BOOL bRegistered; ]Hv[IodJ  
  BOOL RegisterHotkey(); #/37V2E  
  UCHAR cKey; Fsg*FH7J  
  UCHAR cMask; F!K>Kz  
  void DeleteIcon(); Tid aa  
  void AddIcon(); \i &<s;  
  UINT nCount; COlaD"Y  
  void SaveBmp(); Xch~ 1K  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor `Pnoxm'  
  // Dialog Data lp8v0e4  
  //{{AFX_DATA(CCaptureDlg) dj%!I:Q>u  
  enum { IDD = IDD_CAPTURE_DIALOG }; <1!O1ab  
  CComboBox m_Key; #g!.T g'  
  BOOL m_bControl; 2 yz _  
  BOOL m_bAlt; _q^E,P  
  BOOL m_bShift; `Q,H|hp;k;  
  CString m_Path; *VN6cSq  
  CString m_Number; a8Wwq?@  
  //}}AFX_DATA xgtR6E^k  
  // ClassWizard generated virtual function overrides }Y4qS  
  //{{AFX_VIRTUAL(CCaptureDlg) 8q7b_Pq1U  
 public: 3G4-^hY<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); c:.eGH_f  
 protected: ?Mfw]z"\C)  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |4`{]2C  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 93hxSRw  
  //}}AFX_VIRTUAL ,2ar7 5Va  
  // Implementation Z3!`J&  
 protected: }(u ol  
  HICON m_hIcon; e96k{C`j0  
  // Generated message map functions &cTU sK  
  //{{AFX_MSG(CCaptureDlg) FVBYo%Ap  
  virtual BOOL OnInitDialog(); }ad|g6i`  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ovV'VcUs  
  afx_msg void OnPaint(); RG`1en  
  afx_msg HCURSOR OnQueryDragIcon(); =g|FT  
  virtual void OnCancel(); =tY T8Q;al  
  afx_msg void OnAbout(); |Q>IrT  
  afx_msg void OnBrowse(); 9&NgtZpt  
  afx_msg void OnChange(); >LuYHr  
 //}}AFX_MSG tLmTjX .6  
 DECLARE_MESSAGE_MAP() teVM*-  
}; 4KrL{Z+}  
#endif dgePPhj  
3+bt~J0  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file D1;QC  
#include "stdafx.h" <9 ;!3xG  
#include "Capture.h" {l >hMxij  
#include "CaptureDlg.h" "zy7C*)>r  
#include <windowsx.h> I<tm"?q0  
#pragma comment(lib,"hook.lib") 40 0#v|b  
#ifdef _DEBUG BsJC0I(  
#define new DEBUG_NEW 4X|zmr:A  
#undef THIS_FILE xN%K^Tree  
static char THIS_FILE[] = __FILE__; ;bhT@aB1  
#endif uW3!Yg@  
#define IDM_SHELL WM_USER+1 WjqO@]P6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); v*yuE5{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); |zE'd!7E  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h)nG)|c  
class CAboutDlg : public CDialog " 2Dngw  
{ FxtI"g\0  
 public: -Y;3I00(  
  CAboutDlg(); VLN_w$iEq  
  // Dialog Data e?f IXk~b  
  //{{AFX_DATA(CAboutDlg) #R RRu2  
  enum { IDD = IDD_ABOUTBOX }; >lM l  
  //}}AFX_DATA &jr3B;g!C  
  // ClassWizard generated virtual function overrides & ZB  
  //{{AFX_VIRTUAL(CAboutDlg) 1ZRT:N<-  
 protected: ;jTN | i'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9~YMyg(Z  
  //}}AFX_VIRTUAL O|UC ?]6  
  // Implementation >-{Hyx  
 protected: !0E&@X:-  
  //{{AFX_MSG(CAboutDlg) WOf 4o  
  //}}AFX_MSG ]M'=^32  
  DECLARE_MESSAGE_MAP() L&OwPd  
}; 61 ~upQaR  
t&Og$@  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) BL58] P84  
{ xAP+FWyV  
 //{{AFX_DATA_INIT(CAboutDlg) (_{y B[z>`  
 //}}AFX_DATA_INIT '[O;zJN;  
} h`.&f  
y18Y:)DkL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) &G$Ucc `  
{ KCDE{za  
 CDialog::DoDataExchange(pDX); P L+sR3bR  
 //{{AFX_DATA_MAP(CAboutDlg) s&J]zb`  
 //}}AFX_DATA_MAP R_xRp&5  
} /|#fejPh  
t);/'3|  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Vs{|xG7W D  
 //{{AFX_MSG_MAP(CAboutDlg) e(8Ba X _  
 // No message handlers /JU.?M35  
 //}}AFX_MSG_MAP Oz#{S:24M+  
END_MESSAGE_MAP() W'TaBuCb  
pcI uN  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]"1DGg \A  
: CDialog(CCaptureDlg::IDD, pParent) 9 JK Ew  
{ bK-N:8Z  
 //{{AFX_DATA_INIT(CCaptureDlg) maR"t+  
  m_bControl = FALSE; cPc</[x[W  
  m_bAlt = FALSE; _n\GNUA  
  m_bShift = FALSE; 5QO9Q]I#_\  
  m_Path = _T("c:\\"); ~.lPEA %%  
  m_Number = _T("0 picture captured."); xA[mm  
  nCount=0; Q.c\/&  
  bRegistered=FALSE; ROZF)|l  
  bTray=FALSE; @!d{bQd,  
 //}}AFX_DATA_INIT *G 9V'9  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ef E.&]  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 9k[9P;"F:  
} 8qu6.  
`x%>8/  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 2T[9f;jM'  
{ zs#@jv$  
 CDialog::DoDataExchange(pDX); ;mKb]  
 //{{AFX_DATA_MAP(CCaptureDlg) &XUiKnNW  
  DDX_Control(pDX, IDC_KEY, m_Key); Yp2eBgo"  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); QnX(V[  
  DDX_Check(pDX, IDC_ALT, m_bAlt); *EwR!L*  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0S$N05  
  DDX_Text(pDX, IDC_PATH, m_Path); =zs`#-^8  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ]L}dzA?:  
 //}}AFX_DATA_MAP j^2j& Ta  
} v1,oilL  
gr-OHeid  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) @49S`  
//{{AFX_MSG_MAP(CCaptureDlg) KRKCD4  
 ON_WM_SYSCOMMAND() d9|<@A  
 ON_WM_PAINT() .Rf_Cl  
 ON_WM_QUERYDRAGICON() tcog'nAz  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) }?v )N).kW  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) )IZ~G\Ra'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) hqkz^!rp  
//}}AFX_MSG_MAP \:F_xq  
END_MESSAGE_MAP() ?p8_AL'RS  
>t_6B~x9  
BOOL CCaptureDlg::OnInitDialog() 5rZ  
{ t}tEvh  
 CDialog::OnInitDialog(); G?Hdq;  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); K8Y=S12Ti  
 ASSERT(IDM_ABOUTBOX < 0xF000); 4)o  
 CMenu* pSysMenu = GetSystemMenu(FALSE); $\y'I Q%  
 if (pSysMenu != NULL) ,L'zRyP  
 { YQA ,f#  
  CString strAboutMenu; 5bpEYW+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); R<N ]B  
  if (!strAboutMenu.IsEmpty()) |*tp16+6  
  { k~ /Nv=D  
   pSysMenu->AppendMenu(MF_SEPARATOR); =+d?x 56  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 2*#|Nj=^  
  } 4d;8`66O  
 } gEE\y{y  
 SetIcon(m_hIcon, TRUE); // Set big icon Qv/=&_6  
 SetIcon(m_hIcon, FALSE); // Set small icon G+\GaY[  
 m_Key.SetCurSel(0); 0'?L#K  
 RegisterHotkey(); UN<]N76!  
 CMenu* pMenu=GetSystemMenu(FALSE); $z*'fXg  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); T0rG M  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); yY&I dE  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); #$qTFN  
 return TRUE; // return TRUE unless you set the focus to a control \6*I'|5 d  
} y7Df_|Z  
N_[*H  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) xe&i^+i  
{ 3WIk  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bhlG,NTP  
 {  l"]}Ts#  
  CAboutDlg dlgAbout; P3 ^Y"Pv?  
  dlgAbout.DoModal(); w}cPs{Vi"  
 } V[vl!XM  
 else s#=7IH30  
 { m5Di=8  
  CDialog::OnSysCommand(nID, lParam); N7R!C)!IL  
 } F6 flIG&h  
} i5,kd~%O  
y>e.~5;  
void CCaptureDlg::OnPaint() (,Df^4%7  
{ ]yPqLJ  
 if (IsIconic()) ZoZ| M a  
 { 8X)Y^uGGZ  
  CPaintDC dc(this); // device context for painting s( q_ o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $43qME  
  // Center icon in client rectangle &m:uO^-D  
  int cxIcon = GetSystemMetrics(SM_CXICON); 63,H{  
  int cyIcon = GetSystemMetrics(SM_CYICON); I,@6J(9  
  CRect rect; >> fH{/l  
  GetClientRect(&rect); .gOL1`b*  
  int x = (rect.Width() - cxIcon + 1) / 2; hv_XP,1K  
  int y = (rect.Height() - cyIcon + 1) / 2; aM0f/"-_  
  // Draw the icon IG9VdDj  
  dc.DrawIcon(x, y, m_hIcon); ~|xA4u5LG  
 } yhA6i  
 else u.Tcg^v  
 { v^iL5y!  
  CDialog::OnPaint(); yFlm[K5YD  
 } 9.B KI/  
} oc0G |  
A`o8'+`C  
HCURSOR CCaptureDlg::OnQueryDragIcon() PGV/ h  
{ tr}Loq\y  
 return (HCURSOR) m_hIcon; *CTlOy  
} (|1A?@sJ#h  
j*TYoH1  
void CCaptureDlg::OnCancel() __GqQUQ  
{ VUR|OV%  
 if(bTray) Qe0lBR?H  
  DeleteIcon(); d-r@E3  
  CDialog::OnCancel(); 1 \6D '/G  
} KE3;V2Ym f  
eHNyNVz  
void CCaptureDlg::OnAbout() I- >Ss},U  
{ ):_\;.L  
 CAboutDlg dlg; _1!OlQ  
 dlg.DoModal(); t+T4-1 3a  
} !6>~?gNd  
Hm'=aff6A  
void CCaptureDlg::OnBrowse() /?F/9hL  
{ (tw)nF  
 CString str; &/]Fc{]^$f  
 BROWSEINFO bi; :;fHDU|  
 char name[MAX_PATH]; lHe{\N[C  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); $ Kncvu  
 bi.hwndOwner=GetSafeHwnd(); Zu("#cA.H  
 bi.pszDisplayName=name; c?&X?<  
 bi.lpszTitle="Select folder"; $#pP Z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; @Y<bwv  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ;{tj2m,  
 if(idl==NULL) x%!s:LVX  
  return; f-G :uI_  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); h2J/c#Qvh  
 str.ReleaseBuffer(); 8~z~_TD6m@  
 m_Path=str; 6){]1h"  
 if(str.GetAt(str.GetLength()-1)!='\\') e-#BDN(O  
  m_Path+="\\"; q ]e`9/U  
 UpdateData(FALSE); O% KsD[W;  
} (~wqa 3  
X1-'COQS%&  
void CCaptureDlg::SaveBmp() g+>(dnX  
{ qUGC" <W  
 CDC dc; };jN\x?&q  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); (VEpVn3{  
 CBitmap bm; e MY<uqdw  
 int Width=GetSystemMetrics(SM_CXSCREEN); ah0`KxO]  
 int Height=GetSystemMetrics(SM_CYSCREEN); # ,_u_'C*!  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,-d 0b0  
 CDC tdc; /-+xQn]  
 tdc.CreateCompatibleDC(&dc); ]cZ!y ~  
 CBitmap*pOld=tdc.SelectObject(&bm); cir$voL  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); MWpQ^dL_  
 tdc.SelectObject(pOld); >A"v ed8  
 BITMAP btm; DiwxXqY  
 bm.GetBitmap(&btm); T)TfB(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 8xV9.4S  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); $r8 ^0ZRr  
 BITMAPINFOHEADER bih; QoIT*!  
 bih.biBitCount=btm.bmBitsPixel; wFsyD3  
 bih.biClrImportant=0; ';jYOVe  
 bih.biClrUsed=0; >TnTnFWX  
 bih.biCompression=0; Be=u&T:~  
 bih.biHeight=btm.bmHeight; X"e5 Y!:M-  
 bih.biPlanes=1; dP<=BcH>f  
 bih.biSize=sizeof(BITMAPINFOHEADER);  s ;oQS5Y  
 bih.biSizeImage=size; 1o;J,dYu  
 bih.biWidth=btm.bmWidth; 6ZG+ZHUC&  
 bih.biXPelsPerMeter=0; !1DKLQ  
 bih.biYPelsPerMeter=0; =JbRu|/  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); dq&yf7  
 static int filecount=0; vAh6+K.e  
 CString name; 9c#+qH  
 name.Format("pict%04d.bmp",filecount++); pU%n]]qF  
 name=m_Path+name; #W'HR  
 BITMAPFILEHEADER bfh; > BY&,4r  
 bfh.bfReserved1=bfh.bfReserved2=0; wq(7|!Eix  
 bfh.bfType=((WORD)('M'<< 8)|'B'); (@<c6WS  
 bfh.bfSize=54+size; &cHV7  
 bfh.bfOffBits=54; (ehK?6[  
 CFile bf; `W:%mJd9  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ?:8ido#-  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +*T7@1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Dhw(#{N  
  bf.WriteHuge(lpData,size); m)v"3ib  
  bf.Close(); Nj xoTLI  
  nCount++; )ufg9"\  
 } f]|ysf  
 GlobalFreePtr(lpData); +HeTtFo{M  
 if(nCount==1) 6)-X  
  m_Number.Format("%d picture captured.",nCount); 57zSu3v4Y  
 else [los dnH^?  
  m_Number.Format("%d pictures captured.",nCount); -o[x2u~n\  
  UpdateData(FALSE); y8L D7<1u  
} wrbLDod /  
Z&4&-RCi  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) WDc+6/<  
{ EQ`(yj  
 if(pMsg -> message == WM_KEYDOWN) {G}.b)9FG  
 { 0Lc9M-Lg  
  if(pMsg -> wParam == VK_ESCAPE) Lz!,kwg  
   return TRUE; Fzpfoz<N  
  if(pMsg -> wParam == VK_RETURN) 6c"0})p  
   return TRUE; +5o8KYV  
 } =Z+nz^'b  
 return CDialog::PreTranslateMessage(pMsg); $8xl#SqH  
} zb}9%.U  
:xD=`ib  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) *-q"3 D`  
{ Nq` C.&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P8>d6;o($  
  SaveBmp(); xA 1hfe.9  
  return FALSE; v:o({Y 1Aq  
} KgOqbSJ  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Mjfx~I27  
 CMenu pop; ~Ro9u p  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); s3O} 6  
 CMenu*pMenu=pop.GetSubMenu(0); Q`D~5ci  
 pMenu->SetDefaultItem(ID_EXITICON); YW`,v6  
 CPoint pt; H]p!\H  
 GetCursorPos(&pt); , GY h9  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 3k# /{Z  
 if(id==ID_EXITICON) }YMy6eW4  
  DeleteIcon(); t!x5fNo)  
 else if(id==ID_EXIT) y[\VUzD*'  
  OnCancel(); 6morum  
 return FALSE; 2f:Eof(B  
} }i`PGx  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); {Jx4xpvPo  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) gu<'QV"  
 AddIcon(); ("+}=*?OF3  
 return res; kc @[9eV  
} VUYmz)m5  
Q7$.LEioN  
void CCaptureDlg::AddIcon() iz?tu: \v&  
{ /yF QeE  
 NOTIFYICONDATA data; 2Sp=rI  
 data.cbSize=sizeof(NOTIFYICONDATA); pN9A{v(  
 CString tip; ;SaX;!`39+  
 tip.LoadString(IDS_ICONTIP); Y&_&s7z  
 data.hIcon=GetIcon(0); NqEA4C  
 data.hWnd=GetSafeHwnd(); dBe`p5Z  
 strcpy(data.szTip,tip); oiyzHx  
 data.uCallbackMessage=IDM_SHELL; Tp?y8r  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; s]mY*@a%  
 data.uID=98; dd%h67J2<  
 Shell_NotifyIcon(NIM_ADD,&data); : G`hm{  
 ShowWindow(SW_HIDE); DrBUe'RH:M  
 bTray=TRUE; _ozg_E  
} ?a8(a zn  
]Xf% ,iu  
void CCaptureDlg::DeleteIcon() @` Eg(  
{ XC "'Q+  
 NOTIFYICONDATA data; .YnFH$;$  
 data.cbSize=sizeof(NOTIFYICONDATA); :.d:9Z|_  
 data.hWnd=GetSafeHwnd(); \&3"<6xA  
 data.uID=98; f=!VsR2o  
 Shell_NotifyIcon(NIM_DELETE,&data); {g~bQ2wDC  
 ShowWindow(SW_SHOW); uN^=<B?B  
 SetForegroundWindow(); S h,&{z!  
 ShowWindow(SW_SHOWNORMAL); ;VNMD 6H  
 bTray=FALSE; OhmQ,  
} 199]WHc  
'GoZqiYT  
void CCaptureDlg::OnChange() Da:unVbU  
{ Ck@J,~x1D  
 RegisterHotkey(); mp?78_I)  
} 3=$q  
>sjhA|gXk  
BOOL CCaptureDlg::RegisterHotkey() /K{9OT@>  
{ ""h)LUrl  
 UpdateData(); )a3J9a;ZS0  
 UCHAR mask=0; ,H2D  
 UCHAR key=0; E+tB&  
 if(m_bControl) N, *m ,  
  mask|=4; bY2 C]r(n  
 if(m_bAlt) RQp|T5Er*  
  mask|=2; O Xi@c;F  
 if(m_bShift) ~+bGN  
  mask|=1; #gaQaUjR  
  key=Key_Table[m_Key.GetCurSel()]; G0{H5_h  
 if(bRegistered){ {}m PEd b  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); nG, U>)  
  bRegistered=FALSE; >Clh] ;K  
 } XfE -fH1j  
 cMask=mask; `#QG6/0  
 cKey=key;  6XJ[h  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); lR`'e0Lq  
 return bRegistered; ]I.n\2R]om  
} h:)Ci!D;  
[kzd(u  
  四、小结 kWb2F7m  
;v~-'*0  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八