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
  • 5354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: l;XUh9RF`A  
  Yo>%s4_,  
  一、实现方法 DCz\TwzU  
N4' .a=1  
  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: rffVfw  
<.: 5Vx(Aw  
#pragma data_seg("shareddata") }1l}-w`F  
HHOOK hHook =NULL; //钩子句柄 nIG[{gGX  
UINT nHookCount =0; //挂接的程序数目 Mp!2`4rD  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 XL=2wh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 D5}DV  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey pn+D@x#IA  
static int KeyCount =0;  'Dnq+  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1  n})  
#pragma data_seg() $&bU2]  
:m)c[q8  
  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。 UzXDi#Ky  
$4ka +nfU  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: Pxap;;\  
R%Kl&c  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR t!NrB X  
cKey,UCHAR cMask) (q055y  
{ AsV8k _qZL  
 BOOL bAdded=FALSE; GcPB'`!M  
 for(int index=0;index<MAX_KEY;index++){ L!`*R)I45  
  if(hCallWnd[index]==0){ mI2|0RWI)l  
   hCallWnd[index]=hWnd; SB5@\^  
   HotKey[index]=cKey; rHH#@ Zx  
   HotKeyMask[index]=cMask; (L]T*03#  
   bAdded=TRUE; ~4l6unCI  
   KeyCount++; R65;oJh  
   break; h<t<]i'  
  } T@2f&Un^  
 } 9t,aT!f  
 return bAdded; cKaL K#~  
} h]G6~TYI5  
//删除热键 =9#i<te  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T]5U_AI@  
{ O<gP)ZW~  
 BOOL bRemoved=FALSE; FA5k45w L  
 for(int index=0;index<MAX_KEY;index++){ T[`QO`\5O  
  if(hCallWnd[index]==hWnd){ V*0Y_T{_  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ {9y9Kr|(P:  
    hCallWnd[index]=NULL; NHst7$Y<  
    HotKey[index]=0; >?H_A  
    HotKeyMask[index]=0; F[Qsv54  
    bRemoved=TRUE; C6Um6 X9/i  
    KeyCount--; ZS07_6.~  
    break; @`#OC#  
   } P1M|f4*  
  } +:j4G^V  
 } GA({ri  
 return bRemoved; 0b!fWS?,k0  
} \Qe'?LRu{  
={e#lC  
$u/8Rp  
  DLL中的钩子函数如下: W+fkWq7`Xx  
QSlf=VK*y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) K*hf(w9="%  
{ "a2H8x  
 BOOL bProcessed=FALSE; M)bC%(xJ  
 if(HC_ACTION==nCode) vq@#Be?@  
 { %t,1_c0w  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 1aXIhk4  
   switch(wParam) DR#3njjEC  
   {   M}_M_  
    case VK_MENU: 0nF>zOmc  
     MaskBits&=~ALTBIT; )AZ`R8-A  
     break; Ip1QVND  
    case VK_CONTROL: 2}W6{T'  
     MaskBits&=~CTRLBIT; 0O@[on;Bd  
     break; ?,A8  fR  
    case VK_SHIFT: n=<q3}1Jej  
     MaskBits&=~SHIFTBIT; ,58kjTM  
     break; 'dd<<E  
    default: //judge the key and send message &k {t0>  
     break; B)LXxdkOn  
   } D(W7O>5vQ2  
   for(int index=0;index<MAX_KEY;index++){ )[a?J,  
    if(hCallWnd[index]==NULL) M $E8:  
     continue; [bQ8A(u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^+YGSg7  
    { ^+.e5roBKj  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); IWSEssP  
     bProcessed=TRUE; av$\@4I  
    } #dXZA>b9  
   }  @=^jpSnZ  
  } vCrWA-q#  
  else if((lParam&0xc000ffff)==1){ //有键按下 .-gm"lB  
   switch(wParam) LQuYCfj|  
   { B%?|br  
    case VK_MENU: (rCPr,@0  
     MaskBits|=ALTBIT; pD)/- Dgdm  
     break; G!fE'B  
    case VK_CONTROL: s`dkEaS  
     MaskBits|=CTRLBIT; w^vK7Z 1$  
     break; 8I|1P l  
    case VK_SHIFT: *8(t y%5F0  
     MaskBits|=SHIFTBIT; TO8\4p*tE  
     break; P7^TRrMF  
    default: //judge the key and send message iz$v8;w  
     break; `^@g2c+d  
   } 6 I>xd  
   for(int index=0;index<MAX_KEY;index++){ h_}BmJh_  
    if(hCallWnd[index]==NULL) ?7uStqa  
     continue; YV>VA<c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M 2U@gC|{  
    { IT{.^rP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iKCTYXN1(  
     bProcessed=TRUE; wLg:YM"  
    } c"_H%x<[  
   } h3vm< R;  
  } 0L 4]z'5  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 7cQHRM+1  
   for(int index=0;index<MAX_KEY;index++){ R&d_ WB4w  
    if(hCallWnd[index]==NULL) 1Rb<(%   
     continue; N NXwT0t  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) pu m9x)y1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -t706(#k  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 +BTNm66Z  
   } )l81R  
  } pR^Y|NG!  
 } Xj&~N;Ysb  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fuwpp  
} "!4>gg3r  
?F_;~  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 0DP%44Cv9  
Ag hj)V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _s#/f5<:B  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); LKwUpu!  
&t@6qi`d  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 8aIq#v  
t,as{.H{h  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) M,dzf  
{ d1LTyzLr  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) r5$?4t  
 { /A`zy  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 DG%%]  
  SaveBmp(); 2ucsTh@  
  return FALSE; APOU&Wd  
 } \Q BpgMi(  
 …… //其它处理及默认处理 g{f>j d  
} [OToz~=)  
Z6 |'k:R8  
qS`|=5f  
  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。 F(kRAe;  
oew]ijnB  
  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。 "vHAp55B{  
M%dl?9pbq  
  二、编程步骤 3[g++B."pC  
eDMwY$J  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; jn3|9x  
f;; S  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !B38! L  
"oGM> @q=B  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; r:\5/0(  
mQ `r`DW  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; frO/ nx|9  
{UVm0AeUq  
  5、 添加代码,编译运行程序。 JnKbd~  
38.J:?Q  
三、程序代码 c#-97"_8  
d"$oV~>P|  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL as47eZ0\  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) #K~j9DuR  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ XQoT},C  
#if _MSC_VER > 1000 1VM5W!}  
#pragma once NCh(-E  
#endif // _MSC_VER > 1000 Xcpm?aTo  
#ifndef __AFXWIN_H__ ,0u0 '  
#error include 'stdafx.h' before including this file for PCH g|*eN{g]uE  
#endif ;w&yGm  
#include "resource.h" // main symbols 7)8}8tY^{  
class CHookApp : public CWinApp k=/|?%  
{ B0SmE_u_N  
 public: .KMi)1L)  
  CHookApp(); 4oEq,o_  
  // Overrides u$ / ]59  
  // ClassWizard generated virtual function overrides g"AfI  
  //{{AFX_VIRTUAL(CHookApp) '-~/!i+=  
 public: UA u4x 7  
  virtual BOOL InitInstance(); ?01""Om   
  virtual int ExitInstance(); K@u."eaD  
  //}}AFX_VIRTUAL "+ JwS  
  //{{AFX_MSG(CHookApp) $}c@S0%P"  
  // NOTE - the ClassWizard will add and remove member functions here. 9%k.GE  
  // DO NOT EDIT what you see in these blocks of generated code ! OU5|m%CmO  
  //}}AFX_MSG P!&CH4+  
  DECLARE_MESSAGE_MAP() :^L]Da3  
}; SG o:FG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); $Lbe5d?\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 8q LgB  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); _+Kt=;Y8  
BOOL InitHotkey(); >u[1v  
BOOL UnInit(); $%"}N_M  
#endif N5_.m(:  
wLp t2b8S  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Tsp-]-)  
#include "stdafx.h" sN) .Jo  
#include "hook.h" PvBbtC-9b  
#include <windowsx.h> 3jVm[c5%]  
#ifdef _DEBUG )'CEWc%  
#define new DEBUG_NEW ]|BSX-V.%i  
#undef THIS_FILE 5K-)X9z?  
static char THIS_FILE[] = __FILE__; ) CTM  
#endif ]<?)(xz  
#define MAX_KEY 100 1KR|i"  
#define CTRLBIT 0x04 &>b1ES.>  
#define ALTBIT 0x02 ?B!ZqJ#  
#define SHIFTBIT 0x01 ~0{Kga  
#pragma data_seg("shareddata") {!?RG\EYN  
HHOOK hHook =NULL; pNWp3+a'  
UINT nHookCount =0; @{a-IW 3  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey _Cs}&Bic_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Oydmq,sVe(  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey TmZ[?IL,  
static int KeyCount =0; 6(^9D_"@  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ,(=]6V  
#pragma data_seg() d iLl>z  
HINSTANCE hins; vj$ 6  
void VerifyWindow(); twS3J)UH  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 0qUap*fvC  
//{{AFX_MSG_MAP(CHookApp) 1}M.}G2u/  
// NOTE - the ClassWizard will add and remove mapping macros here. meD (ja  
// DO NOT EDIT what you see in these blocks of generated code! m =F@CA~C  
//}}AFX_MSG_MAP =eLb"7C#0  
END_MESSAGE_MAP() OYy !4Fp  
c9@jyq_H?  
CHookApp::CHookApp() ng*E9Puu[  
{ F}DD;K  
 // TODO: add construction code here, 4N0nU  
 // Place all significant initialization in InitInstance <5}du9@  
} e>Y2q|S85  
?0%TE\I8  
CHookApp theApp; 6+z]MT  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) i)3\jO0&GU  
{ 291|KG  
 BOOL bProcessed=FALSE; jP'b! 4  
 if(HC_ACTION==nCode) \ \}/2#1=c  
 { `\0a5UFR  
  if((lParam&0xc0000000)==0xc0000000){// Key up K! j*:{  
   switch(wParam) zL}hFmh  
   { 1y;zPJ<ntm  
    case VK_MENU: 04d$_1:}a  
     MaskBits&=~ALTBIT; EC&,0i4n:  
     break; 4T E ?mh}  
    case VK_CONTROL: {3Wc<&D C1  
     MaskBits&=~CTRLBIT; k4rB S  
     break; B '/ >Ax&  
    case VK_SHIFT: 0.0!5D[  
     MaskBits&=~SHIFTBIT; 1hS~!r'qqv  
     break; x@}Fn:c!5  
    default: //judge the key and send message ,O!aRvzap  
     break; Z$XpoDbOy  
   } <]^D({`  
   for(int index=0;index<MAX_KEY;index++){ L:Eb(z/D  
    if(hCallWnd[index]==NULL) PtOnj)Q  
     continue; kR(=VM JU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) d vxEXy  
    { ~]M"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); -"H4brj;G  
     bProcessed=TRUE; V,5}hQJ F  
    } H\bIO!vb  
   } .Tv(1HAc2l  
  } +cH(nZ*f  
  else if((lParam&0xc000ffff)==1){ //Key down IBh~(6  
   switch(wParam) >#|Yoc  
   { Jo<6M'  
    case VK_MENU: +r_[Tj|Er  
     MaskBits|=ALTBIT; eUlb6{!y?  
     break; zK?[dO  
    case VK_CONTROL: A o$z )<d'  
     MaskBits|=CTRLBIT; gw T,D.'Ut  
     break; /vu!5?S  
    case VK_SHIFT: qV,j)b3M  
     MaskBits|=SHIFTBIT; w-Fk&dC69  
     break; GR `ncI$z  
    default: //judge the key and send message 2z3A"HrlA  
     break; f*Js= hvO  
   } _9r{W65s  
   for(int index=0;index<MAX_KEY;index++) ^j}sS!p  
   { {m:R v&T  
    if(hCallWnd[index]==NULL) W^Y0>W~  
     continue; ; bE6Y]"Rz  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3~rc=e  
    { cU|jT8Q4H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); =U2n"du  
     bProcessed=TRUE; a*y mBGF  
    } x$DJ  
   } V"iLeC  
  } *'-^R9dN.S  
  if(!bProcessed){ +to9].O7y  
   for(int index=0;index<MAX_KEY;index++){ 8 GN{*Hg  
    if(hCallWnd[index]==NULL) F9r*ZyNlx  
     continue; vy2aNUmt  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ZQA C &:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); V.:A'!$#  
   } )W|jt/  
  } p>3'77 V  
 } mC(t;{  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); U:hC! t:  
} " SqKS,J  
Y3>\;W*?  
BOOL InitHotkey() # HYkzjb  
{ ?GU!ke p  
 if(hHook!=NULL){ %nF\tVP3]  
  nHookCount++; XtdLKYET  
  return TRUE; S]O Hv6  
 } ,>v9 Y#U  
 else %[m1\h"1  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _!p3M3"$B  
  if(hHook!=NULL) ~1sl.8tF  
   nHookCount++; A"iD4Q  
  return (hHook!=NULL); Q@VnJ,  
} a@ }r[0O  
BOOL UnInit() d<nB=r!*  
{ olh3 R.M<  
 if(nHookCount>1){ #)}bUNc'  
  nHookCount--; t'x:fO?cp  
  return TRUE;  o f  
 } DNBpIC5&6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); BK SK@OV  
 if(unhooked==TRUE){ w8I&:"^7<  
  nHookCount=0; |9Ks13?Ck  
  hHook=NULL; 5>Yd\(`K  
 } w{EU9C  
 return unhooked; B?Sfcq-  
} 1R9? [RE  
w{x(YVS H  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) /,$\H  
{ PGl-2Cr  
 BOOL bAdded=FALSE; } /3pC a  
 for(int index=0;index<MAX_KEY;index++){ "m;]6B."  
  if(hCallWnd[index]==0){ %v:h]TA  
   hCallWnd[index]=hWnd; K/ m)f#  
   HotKey[index]=cKey; u@u.N2H.%  
   HotKeyMask[index]=cMask; WVK-dBU  
   bAdded=TRUE; l{m~d!w`a  
   KeyCount++; MPy][^s!  
   break; E9 q;>)}  
  } D#}Yx]Q1  
 } Am0C|(#Xm  
 return bAdded; q*TKs#3  
} Ab<Ok\e5  
[j U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lILtxVBO2o  
{ F>(#Af9  
 BOOL bRemoved=FALSE; BG0M j2  
 for(int index=0;index<MAX_KEY;index++){ v/.h%6n?  
  if(hCallWnd[index]==hWnd){ NVWeJ+w  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bMOM`At>z  
    hCallWnd[index]=NULL; |hQ|'VCN  
    HotKey[index]=0; Sb4PCt  
    HotKeyMask[index]=0; \OT)KVwO  
    bRemoved=TRUE; ^6y4!='ci  
    KeyCount--; Ilu`b|%D  
    break; ruA+1-<f  
   } 13_~)V  
  } bRz^=  
 } RXS|-_$  
 return bRemoved; sxwW9_C  
} }Rxg E~ F  
"`*a)'.'^c  
void VerifyWindow() yXo0z_ G  
{ q,JA~GG  
 for(int i=0;i<MAX_KEY;i++){ C;:L~)C@t  
  if(hCallWnd!=NULL){ 6cT~irP  
   if(!IsWindow(hCallWnd)){ i)PV{3v$J  
    hCallWnd=NULL; B~g05`s  
    HotKey=0; |$?Ux,(6  
    HotKeyMask=0; \(U"_NPp  
    KeyCount--; T_tDpq_|  
   } f"<@6Axq  
  } 3H}~eEg,  
 } }>X\"  
} Q>a7Ps@~  
/,N!g_"Z  
BOOL CHookApp::InitInstance() >dvWa-rNUT  
{ Bx : So6:  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); (X_,*3Yxk  
 hins=AfxGetInstanceHandle(); .>64h H  
 InitHotkey(); :`u&TXsu  
 return CWinApp::InitInstance(); K[>@'P}y  
} UtBlP+bE?y  
i,Wm{+H-O  
int CHookApp::ExitInstance() 3 s_k>cO=  
{ Q}?N4kg  
 VerifyWindow(); Xm=^\K3  
 UnInit(); ngY+Ym  
 return CWinApp::ExitInstance(); QJIItx4hE  
} y(3c{y@~X  
Ma=6kX]  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file }vUlTH  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) M?~<w)L}  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ oD#< ?h)(  
#if _MSC_VER > 1000 }#W`<,*rL.  
#pragma once +>WC^s  
#endif // _MSC_VER > 1000 qz=#;&ZU  
<r+!hJ[s'  
class CCaptureDlg : public CDialog ,*nZf|  
{ Ei9_h  
 // Construction i B!hEbz  
 public: =Kt9,d08x  
  BOOL bTray; ]O7.ss/2  
  BOOL bRegistered; Ns!3- Y  
  BOOL RegisterHotkey(); m,gy9$  
  UCHAR cKey; $]H=  
  UCHAR cMask; hLytKPgt  
  void DeleteIcon(); :ONuWNY N  
  void AddIcon(); lO2T/1iMTW  
  UINT nCount; [71#@^ye  
  void SaveBmp(); ]oas  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Y!= k  
  // Dialog Data a?,[w'7FU  
  //{{AFX_DATA(CCaptureDlg) L;--d`[  
  enum { IDD = IDD_CAPTURE_DIALOG }; TI[UX16Tz1  
  CComboBox m_Key; U%^eIXV|  
  BOOL m_bControl; I)XOAf$6  
  BOOL m_bAlt; ;]&~D +XH  
  BOOL m_bShift; :e&n.i^  
  CString m_Path; gVnws E  
  CString m_Number; u JQaHL!  
  //}}AFX_DATA dm,}Nbc91(  
  // ClassWizard generated virtual function overrides (,Ja  
  //{{AFX_VIRTUAL(CCaptureDlg) qF{DArc  
 public: ;naq-%'Sg  
  virtual BOOL PreTranslateMessage(MSG* pMsg); NlF0\+h  
 protected: T}t E/  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support o4/I1Mq  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam);  z _O,Y  
  //}}AFX_VIRTUAL 2 ]V>J  
  // Implementation LmXF`Y$  
 protected: xMNNXPz(  
  HICON m_hIcon; vcw>v={x  
  // Generated message map functions 0eqi1;$b]  
  //{{AFX_MSG(CCaptureDlg) pM&]&Nk  
  virtual BOOL OnInitDialog(); t/d',Khg  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >d{dZD}  
  afx_msg void OnPaint(); 5e#&"sJ.1  
  afx_msg HCURSOR OnQueryDragIcon(); 8R\>FNk;  
  virtual void OnCancel(); \]T=j#.S$  
  afx_msg void OnAbout(); fou_/Nrue  
  afx_msg void OnBrowse(); SE;Tujwhqi  
  afx_msg void OnChange(); :WK"-v  
 //}}AFX_MSG _(oP{w gB  
 DECLARE_MESSAGE_MAP() vv2vW=\  
}; ~_ u*\]-  
#endif 15xd~V?ai:  
MegE--h  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =f4[=C$&`  
#include "stdafx.h" <G~} N  
#include "Capture.h" Sa;<B:|  
#include "CaptureDlg.h" t;.^K\S4  
#include <windowsx.h> j\`EUC  
#pragma comment(lib,"hook.lib") [lNqT1%]  
#ifdef _DEBUG PTbA1.B  
#define new DEBUG_NEW Pt6hGSo.  
#undef THIS_FILE EjR_-8@FK  
static char THIS_FILE[] = __FILE__; CxbSj,  
#endif Uvjdx(fY[a  
#define IDM_SHELL WM_USER+1 \~@[QGKN  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *xE"8pN/  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); c=A(o  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9Fy\t{ks  
class CAboutDlg : public CDialog ""1#bs{n  
{ bBUbw*DF)  
 public: lAdDu  
  CAboutDlg(); 1B)Y;hg6&  
  // Dialog Data 7P<r`,~k-  
  //{{AFX_DATA(CAboutDlg) w]>"'o{{  
  enum { IDD = IDD_ABOUTBOX }; 8K \'Z  
  //}}AFX_DATA &W=V%t>Z  
  // ClassWizard generated virtual function overrides <w0NPrS]  
  //{{AFX_VIRTUAL(CAboutDlg) -{X<*P4p  
 protected: ixIV=#  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 0jxO |N2)  
  //}}AFX_VIRTUAL $ Wit17j  
  // Implementation r]A" Og_U  
 protected: }P<Qz^sr_  
  //{{AFX_MSG(CAboutDlg) 1~}m.ER  
  //}}AFX_MSG yZYK wKG  
  DECLARE_MESSAGE_MAP() Ps U9R#HL1  
}; R K"&l!o  
<y@,3DD3A9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) p91`<>Iw  
{ |@ikx{W  
 //{{AFX_DATA_INIT(CAboutDlg) V bg10pV0  
 //}}AFX_DATA_INIT q} ]'Q -  
} j/)"QiS*?  
r<;l{7lY_  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) k? 3S  
{ ;i<$7MR.e  
 CDialog::DoDataExchange(pDX); ic%?uWN  
 //{{AFX_DATA_MAP(CAboutDlg) .6>  hD1'  
 //}}AFX_DATA_MAP 3B@y &a#&  
} *#3*;dya]  
P^ptsZ%  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) .z=U= _e  
 //{{AFX_MSG_MAP(CAboutDlg) weNzYMf%  
 // No message handlers "pt+Fe|@c;  
 //}}AFX_MSG_MAP Dt.0YKF  
END_MESSAGE_MAP() 9YR]+*  
yiiyqL*E  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ne3R.g9;Z  
: CDialog(CCaptureDlg::IDD, pParent) Lltc 4Mzw  
{ 86 *;z-G  
 //{{AFX_DATA_INIT(CCaptureDlg) gRBSt M&hU  
  m_bControl = FALSE; gks ==|s.  
  m_bAlt = FALSE; bf& }8I$  
  m_bShift = FALSE; _p\629`  
  m_Path = _T("c:\\"); kmryu=  
  m_Number = _T("0 picture captured."); =EQJqj1T  
  nCount=0; |#{-.r6Y]  
  bRegistered=FALSE; EQ4#fAM)  
  bTray=FALSE; 'eD J@4Xm  
 //}}AFX_DATA_INIT \[:PykS  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 *yJ[zXXjJ  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); l^.K'Q1~a  
} $tI]rU  
@.'z* |z  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) =WC-Sj{I  
{ !RS9%ES_?  
 CDialog::DoDataExchange(pDX); rJ'/\Hh5P  
 //{{AFX_DATA_MAP(CCaptureDlg) wZ#Rlv,3Wa  
  DDX_Control(pDX, IDC_KEY, m_Key); ~A6"sb=  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {J (R  
  DDX_Check(pDX, IDC_ALT, m_bAlt); KkEv#2n  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); J^ `hbP+2  
  DDX_Text(pDX, IDC_PATH, m_Path); 8O>}k  
  DDX_Text(pDX, IDC_NUMBER, m_Number); !<&m]K  
 //}}AFX_DATA_MAP *n8%F9F  
} 7W"/ N#G  
x<)G( Xe*  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) /D<"wF }@J  
//{{AFX_MSG_MAP(CCaptureDlg) _5mc('  
 ON_WM_SYSCOMMAND() - a y5  
 ON_WM_PAINT() g?B3!,!9  
 ON_WM_QUERYDRAGICON() Ht#@'x  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Cezh l  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) oK2pM18  
 ON_BN_CLICKED(ID_CHANGE, OnChange) &uv0G'"\  
//}}AFX_MSG_MAP wJ gX/W  
END_MESSAGE_MAP() n-$VUo  
s2FngAM;f  
BOOL CCaptureDlg::OnInitDialog() |g%mP1O  
{ ;imRh'-V6  
 CDialog::OnInitDialog(); Ir5WN_EaS  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); %JtbRs(~q  
 ASSERT(IDM_ABOUTBOX < 0xF000); mLwoi!]m  
 CMenu* pSysMenu = GetSystemMenu(FALSE); {Hl[C]25X  
 if (pSysMenu != NULL) UfO7+_2  
 { <\" .L  
  CString strAboutMenu; %a];  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 5!Bktgk.  
  if (!strAboutMenu.IsEmpty()) ZU^I H9  
  { 2edBQYWd  
   pSysMenu->AppendMenu(MF_SEPARATOR); M`vyTuO3SO  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 'CXRG$D  
  } %K(0W8&  
 } 1j0-9Kg'  
 SetIcon(m_hIcon, TRUE); // Set big icon z>;$im   
 SetIcon(m_hIcon, FALSE); // Set small icon H6 &7\Wbk  
 m_Key.SetCurSel(0); mffIf1f  
 RegisterHotkey(); t|V0x3X  
 CMenu* pMenu=GetSystemMenu(FALSE); T$KF< =  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); C)Jn[/BD  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); w(j^ccPD  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ubYG  
 return TRUE; // return TRUE unless you set the focus to a control 'xnnLCm.  
} X<]qU3k5  
F[saP0 *  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) n,j$D62[  
{ [iS,#w` 5  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) e'2Y1h  
 { ymWgf 6r<  
  CAboutDlg dlgAbout; ;;Ds  
  dlgAbout.DoModal(); {fV}gR2  
 } :m'+tGs  
 else vMla'5|l  
 { NOt@M  
  CDialog::OnSysCommand(nID, lParam); iWE)<h  
 } -Xz&}QA  
} 5l DFp9  
@*MC/fe  
void CCaptureDlg::OnPaint() FB:<zmwR  
{ #z!^ <,  
 if (IsIconic()) aRJcSV  
 { Jq ]:<TQ  
  CPaintDC dc(this); // device context for painting K>2#UzW  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 4=Gph  
  // Center icon in client rectangle uS+k^ #  
  int cxIcon = GetSystemMetrics(SM_CXICON); J:j<"uPm  
  int cyIcon = GetSystemMetrics(SM_CYICON); F7MzCZvu  
  CRect rect; ]XA4;7  
  GetClientRect(&rect); ,FZT~?  
  int x = (rect.Width() - cxIcon + 1) / 2; W `z 0"  
  int y = (rect.Height() - cyIcon + 1) / 2; :q#K} /  
  // Draw the icon Y[Ltrk{  
  dc.DrawIcon(x, y, m_hIcon); UsQ4~e 4-  
 } kforu!C  
 else @kFu*"  
 { FP^{=0  
  CDialog::OnPaint(); R?66b{O  
 } q o 1lj"P  
} AoaN22  
{/<6v. v  
HCURSOR CCaptureDlg::OnQueryDragIcon() 7=XL!:P  
{ %7hB&[ 5  
 return (HCURSOR) m_hIcon; J*fBZ.NO  
} ILwn&[A0  
&<pKx!  
void CCaptureDlg::OnCancel() aj\nrD1  
{ =~KsS }`1,  
 if(bTray) !yOeW0/2[  
  DeleteIcon(); SC &~s$P;  
  CDialog::OnCancel(); jJZgK$5+  
} C'A]i5  
sZ&G%o  
void CCaptureDlg::OnAbout() %\$;(#h  
{ B>y9fI  
 CAboutDlg dlg; $ (=~r`O+1  
 dlg.DoModal(); }!>=|1 fY  
} &PWB,BXv  
<plC_{Y:wu  
void CCaptureDlg::OnBrowse() D]s]"QQ8  
{ w$Ot{i|$(  
 CString str; ,)!u)wz  
 BROWSEINFO bi; (Y% Q|u  
 char name[MAX_PATH]; qT:zEt5  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); \C^;k%{LV  
 bi.hwndOwner=GetSafeHwnd(); ra N)8w}-  
 bi.pszDisplayName=name; e`>{$t  
 bi.lpszTitle="Select folder"; z*$q8Z&7rg  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; ,m<H-gwa  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dq1:s1  
 if(idl==NULL) K+=+?~  
  return; >wHxmq8F5<  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); (b,[C\RBF  
 str.ReleaseBuffer(); W5L iXM  
 m_Path=str; $_H`   
 if(str.GetAt(str.GetLength()-1)!='\\') 4 1a. #o  
  m_Path+="\\"; eM7Bc4V  
 UpdateData(FALSE); `#-P[q<v-  
} sbj(|1,ac  
2F#q I1  
void CCaptureDlg::SaveBmp() xVL5'y1g B  
{ )vg5((C  
 CDC dc; Mb1t:Xf^g  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); KOz(TZ?u  
 CBitmap bm; [+m?G4[  
 int Width=GetSystemMetrics(SM_CXSCREEN); l7{oi!   
 int Height=GetSystemMetrics(SM_CYSCREEN); >gwz,{  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 5}$b0<em~  
 CDC tdc; ;Vik5)D2D  
 tdc.CreateCompatibleDC(&dc); *=V7@o  
 CBitmap*pOld=tdc.SelectObject(&bm); *'Y@3vKE  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); m!z|h9Ed  
 tdc.SelectObject(pOld); f h#C' sn  
 BITMAP btm; h:zK(;  
 bm.GetBitmap(&btm); NLPkh,T:  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; -x8nQ%X  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); p!O(Y6QM  
 BITMAPINFOHEADER bih; |2\{z{?  
 bih.biBitCount=btm.bmBitsPixel; m'\2:mDu0  
 bih.biClrImportant=0; <<](XgR(  
 bih.biClrUsed=0; /2EHv.e `  
 bih.biCompression=0; 1i:|3PA~  
 bih.biHeight=btm.bmHeight; %CUGm$nH  
 bih.biPlanes=1; 'I;!pUfVp  
 bih.biSize=sizeof(BITMAPINFOHEADER); km^^T_ M/  
 bih.biSizeImage=size; Ofm%:}LV  
 bih.biWidth=btm.bmWidth; n+lOb  
 bih.biXPelsPerMeter=0; yme^b ;a  
 bih.biYPelsPerMeter=0; {!|}=45Z  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Y HSYu  
 static int filecount=0; Y)N-V ]5L  
 CString name; fFj grK8  
 name.Format("pict%04d.bmp",filecount++); 7XKY]|S,'  
 name=m_Path+name; x3qW0K8  
 BITMAPFILEHEADER bfh; 8:BIbmtt5  
 bfh.bfReserved1=bfh.bfReserved2=0; 9% l%  
 bfh.bfType=((WORD)('M'<< 8)|'B'); +aF}oA&X[  
 bfh.bfSize=54+size; 63`{.yZ*z  
 bfh.bfOffBits=54; wC `+  
 CFile bf; F:y[@Yn  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ pwwH<0[  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); b=~i)`  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); +xc'1id@[  
  bf.WriteHuge(lpData,size); K=!Bh*  
  bf.Close(); A)%A!  
  nCount++; HV6f@  
 } Ig3;E+*>  
 GlobalFreePtr(lpData); lds- T  
 if(nCount==1) A,r*%&4~  
  m_Number.Format("%d picture captured.",nCount); %IC73?  
 else ` PYJ^I0  
  m_Number.Format("%d pictures captured.",nCount); 8NaqZ+5x  
  UpdateData(FALSE); s w39\urf  
} `tjH<  
+w=AJdc  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) /mp*>sNr6  
{ &WNf M+  
 if(pMsg -> message == WM_KEYDOWN) DjSbyXvrg  
 { Gmf B  
  if(pMsg -> wParam == VK_ESCAPE) [<'-yQ{l\  
   return TRUE; Us+pc^A  
  if(pMsg -> wParam == VK_RETURN) J'N!Omz  
   return TRUE; sdQkT#%y  
 } A^q[N  
 return CDialog::PreTranslateMessage(pMsg); j"AU z)x  
} @6l%,N<fou  
D#&q&6P{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) nLV9<M Zm  
{ y*D]Q`5cag  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Oft4- 4$E  
  SaveBmp(); l}$ U])an#  
  return FALSE; "M|zv  
} hKzSgYxP=t  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ tv!_e$CR  
 CMenu pop; a'!zG cT  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Qt vYv!  
 CMenu*pMenu=pop.GetSubMenu(0); 4)1s M=u  
 pMenu->SetDefaultItem(ID_EXITICON); +la2n(CAK  
 CPoint pt; pv&y91  
 GetCursorPos(&pt); B<C*  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); KiJT!moB  
 if(id==ID_EXITICON) O(+phRwJ  
  DeleteIcon(); 4lBU#V7  
 else if(id==ID_EXIT) D@!=d@V.  
  OnCancel(); wm+/e#'&  
 return FALSE; `'V4PUe  
} EvOJ~'2 Y%  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); J!:SPQ  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) eds26(  
 AddIcon(); 4wrk2x[  
 return res; XoA+MuDzpo  
} ,=l7:n  
tU_y6  
void CCaptureDlg::AddIcon() 2(/g}  
{ i+gQE!  
 NOTIFYICONDATA data; 3E 3HL7  
 data.cbSize=sizeof(NOTIFYICONDATA); ,\qs4&  
 CString tip; $V1;la!  
 tip.LoadString(IDS_ICONTIP); K~22\G`  
 data.hIcon=GetIcon(0); 6 ND`l5  
 data.hWnd=GetSafeHwnd(); 2 !'A:;  
 strcpy(data.szTip,tip); n> ^[T[.S  
 data.uCallbackMessage=IDM_SHELL; Q'%PNrN  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; W3iZ|[E;  
 data.uID=98; EY \H=@A  
 Shell_NotifyIcon(NIM_ADD,&data); Y-7^o@y  
 ShowWindow(SW_HIDE); -&<Whhs.@  
 bTray=TRUE; ^a#X9  
} Offu9`DiZ  
Me=CSQqf<  
void CCaptureDlg::DeleteIcon()  Br` IW  
{ tO0!5#-VR  
 NOTIFYICONDATA data; [H=)  
 data.cbSize=sizeof(NOTIFYICONDATA); W^s ;Bi+Nw  
 data.hWnd=GetSafeHwnd(); )n,P"0  
 data.uID=98; zA[0mkC?$  
 Shell_NotifyIcon(NIM_DELETE,&data); %rxO_  
 ShowWindow(SW_SHOW); H/Llj.-jg  
 SetForegroundWindow(); up'Tit  
 ShowWindow(SW_SHOWNORMAL); );FJx~b  
 bTray=FALSE; lGVEpCS}  
} L(U"U#QZ  
F4K0) ;  
void CCaptureDlg::OnChange() /Ml.}7&  
{ $ aUo aI  
 RegisterHotkey(); 48Mpf=f`  
} X,LD   
`\+@Fwfx  
BOOL CCaptureDlg::RegisterHotkey() ~V$ |i"  
{ p ZZc:\fJ  
 UpdateData(); _r2J7&  
 UCHAR mask=0; ai{Sa U  
 UCHAR key=0; a<@N-Exr  
 if(m_bControl) G#?Sfn O0  
  mask|=4; +). 0cs0k5  
 if(m_bAlt) uV=Qp1~  
  mask|=2; v'BZs   
 if(m_bShift) nB!&Zq  
  mask|=1; $#]]K  
  key=Key_Table[m_Key.GetCurSel()]; rta:f800z  
 if(bRegistered){ -N"&/)  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 1|ra&(=)  
  bRegistered=FALSE; mdw7}%5V  
 } z(H^..<!5  
 cMask=mask; v{A KEX*  
 cKey=key; eGX %KT"O  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); .j-IX1Sa  
 return bRegistered; {6}eN|4~#  
} ?]x|Zy  
k2AJXw  
  四、小结 U{VCZ*0cj  
e/^=U7:io  
  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
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八