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
  • 6020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:  \+:`nz3m  
  7G0;_f{  
  一、实现方法 -z%->OUu  
_nSEp >]L  
  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: +-|}<mq  
XD80]@\za  
#pragma data_seg("shareddata") 9Q\RCl_1  
HHOOK hHook =NULL; //钩子句柄 n(C M)(ozU  
UINT nHookCount =0; //挂接的程序数目 ;Eh"]V,e  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 5Fbb5`(  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 FtlJ3fB@  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey b;NVvc(  
static int KeyCount =0; LLbI}:  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 D}U gC\u  
#pragma data_seg() 1K'cT\aFm  
QSwT1P'U  
  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。 ;vn0b"Fi3  
$x#qv1  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: PF+Or  
9D;ono3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR [w)KNl  
cKey,UCHAR cMask) O3pd5&^g  
{ YdUcO.V  
 BOOL bAdded=FALSE; Mky^X,r  
 for(int index=0;index<MAX_KEY;index++){ 5'%O]~  
  if(hCallWnd[index]==0){ J/PK #<  
   hCallWnd[index]=hWnd;  '{cFr  
   HotKey[index]=cKey; HrT@Df  
   HotKeyMask[index]=cMask; u`Kc\B Sn  
   bAdded=TRUE; 9E|QPT  
   KeyCount++; :^FH.6}x  
   break; 5r d t  
  } bL{D*\HF  
 } 1[- `*Ph  
 return bAdded; a)7&2J  
} muKu@nshL  
//删除热键 ++ObsWZ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7Q,<h8N\5  
{ u#Bj#y!  
 BOOL bRemoved=FALSE; ]I]G3 e  
 for(int index=0;index<MAX_KEY;index++){ B~,?Gbl+g  
  if(hCallWnd[index]==hWnd){ /;xrd\du  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 0T 0I<t  
    hCallWnd[index]=NULL; K1-RJj\L  
    HotKey[index]=0; i~*6JB|  
    HotKeyMask[index]=0; *z_`$Y  
    bRemoved=TRUE; =5:kV/p  
    KeyCount--; 6j|~oMYP  
    break; ~{N#JOY}Z  
   } z]=Ks_7  
  } U.ZA%De  
 } JV+Uy$P!  
 return bRemoved; JIc9csr:b  
} v "[<pFj^  
aJc>"#+ o  
:_+U[k(#  
  DLL中的钩子函数如下: >y!O_@>z  
m |.0$+=  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ISTAJ8" D  
{ $"#M:V @  
 BOOL bProcessed=FALSE; +aqQa~}r  
 if(HC_ACTION==nCode) B%o%%A8*g  
 { =PnNett}a  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 dkSd Y+Q  
   switch(wParam) )]Sf|@K]  
   {  v[?gM.SF  
    case VK_MENU: ^}:0\;|N  
     MaskBits&=~ALTBIT; r]kks_!Z  
     break; .'2"83f  
    case VK_CONTROL: S'>KGdF  
     MaskBits&=~CTRLBIT; jP<6Q|5F  
     break; uVXn/B  
    case VK_SHIFT: u{dkUG1ia  
     MaskBits&=~SHIFTBIT; u/N_62sk5  
     break; dN){w _  
    default: //judge the key and send message CurU6x1  
     break; ?Qts2kae#  
   } W!TT fj   
   for(int index=0;index<MAX_KEY;index++){ `}8)P#  
    if(hCallWnd[index]==NULL) '%YTM N@  
     continue; `];ne]xM  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Ad -_=a%  
    { !L_xcov!Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s"8z q ;)  
     bProcessed=TRUE; )a+bH</'  
    } Qb;]4[3  
   } "kucFf f  
  } 'z+Pa^)v  
  else if((lParam&0xc000ffff)==1){ //有键按下 v~p?YYOm<  
   switch(wParam) 9>_VU"T  
   { ,3)JZM  
    case VK_MENU: r 2{7h>  
     MaskBits|=ALTBIT; @#9xSs#  
     break; tao9icl*`  
    case VK_CONTROL: :MH=6  
     MaskBits|=CTRLBIT; a &`^M  
     break; -7EwZRS@9  
    case VK_SHIFT: 472'P  
     MaskBits|=SHIFTBIT; H 'nLC,  
     break; 9mpQusM  
    default: //judge the key and send message [yRqSB  
     break; 37V$Qb_  
   } c3\p@}  
   for(int index=0;index<MAX_KEY;index++){ $A(3-n5=  
    if(hCallWnd[index]==NULL) #!rH}A>n+  
     continue; |6`7kb;p  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) h5^We"}+  
    { Q"qJ0f)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); jank<Q&w  
     bProcessed=TRUE; j\.e6&5%SS  
    } ^Je*k)COn  
   } /&!o]fU1C  
  } TNcMrbWA  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 9s*UJIL  
   for(int index=0;index<MAX_KEY;index++){ I."s&]FZ  
    if(hCallWnd[index]==NULL) y cWY.HD  
     continue; TI8E W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) vTp,j-^  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); q"LT8nD\  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 6-nf+!#G  
   } frWY8&W^H  
  } g~OG~g@  
 } uLN.b339  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); LC0-O1  
} |J ^I8gx+  
nH[>Sff$  
  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: Zj nWbnW  
Z,F1n/7  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); r&XxF >  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); zaE!=-U  
*mN8Qd  
  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: ;47=x1j i  
TQ5kT?/{  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 5%DHF-W)  
{ Q%t _Epe  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) wJ7Fnj>u%  
 { ASNo6dP 7  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 73!])!SVI  
  SaveBmp(); <*p  
  return FALSE; H#bu3*'  
 } F+V[`w*k  
 …… //其它处理及默认处理 BkDq9>  
} CTc#*LJx>j  
t1aKq)?  
ay=f1<a  
  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。 #;'*W$Wk2  
h:vI:V[/X  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 y!\q ', F  
qmnW  
  二、编程步骤 B{1yMJA  
1rh2!4)7  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; uY+N163i  
!"{+|heU9p  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 8Qtd,  
^W-03  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; "I.PV$Rxl  
O 4xV "\  
  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; '(M8D5?N-  
_l}"gUtiw  
  5、 添加代码,编译运行程序。 e >W}3H5w0  
|pB[g> ~V  
三、程序代码 /L,VZ?CmtK  
N- E)b  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL -x i]~svg  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) k[3J5 4`g1  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ ki`7S  
#if _MSC_VER > 1000 =sVB.P  
#pragma once u'"VbW3u n  
#endif // _MSC_VER > 1000 Z3Le?cMt^  
#ifndef __AFXWIN_H__ )sg@HFhY'  
#error include 'stdafx.h' before including this file for PCH ZsjDe{TH  
#endif ?`%7Y~  
#include "resource.h" // main symbols D&KD5_Sw  
class CHookApp : public CWinApp lc%2fVG-e  
{ C^vB&3ghi  
 public: 'yG9Rt  
  CHookApp(); &sJZSrk|  
  // Overrides 5[\mwUA  
  // ClassWizard generated virtual function overrides D,Ft*(|T  
  //{{AFX_VIRTUAL(CHookApp) "0al"?  
 public: >q{E9.~b  
  virtual BOOL InitInstance(); d\Q~L 3x  
  virtual int ExitInstance(); "W:#4@ F  
  //}}AFX_VIRTUAL Z["[^=EP  
  //{{AFX_MSG(CHookApp) ]mEY/)~7  
  // NOTE - the ClassWizard will add and remove member functions here. at_~b Ox6X  
  // DO NOT EDIT what you see in these blocks of generated code ! Lw EI   
  //}}AFX_MSG P9j[ NEV  
  DECLARE_MESSAGE_MAP() w-9FF%@<  
}; Q9v OY8  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); md8r"  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `/en&l  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  XI+m  
BOOL InitHotkey(); L[4Su;D  
BOOL UnInit(); 4,D$% .  
#endif fh rS7f'Zd  
Qs(WyP#  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. i@7b  
#include "stdafx.h" ~/0 t<^  
#include "hook.h" d^5OB8t  
#include <windowsx.h> k)+2+hX&>  
#ifdef _DEBUG e.X*x4*>~  
#define new DEBUG_NEW W-9?|ei  
#undef THIS_FILE *uJcB|KX  
static char THIS_FILE[] = __FILE__; {<f_,Nlc  
#endif fI:j@Wug  
#define MAX_KEY 100 )m . KV5K!  
#define CTRLBIT 0x04 DQ'yFPE  
#define ALTBIT 0x02 N 2|?I(\B  
#define SHIFTBIT 0x01  WW5AD$P*  
#pragma data_seg("shareddata") 3N8RZt1.b  
HHOOK hHook =NULL; ".Lwq_  
UINT nHookCount =0; PGTi-o}  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 3f;W+^NY  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT q'r(#,B<3  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey i"eUacBz/-  
static int KeyCount =0; ILsw'  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift sC ,[CN:b  
#pragma data_seg() JO*}\Es  
HINSTANCE hins; S!*wK-  
void VerifyWindow(); ~N{ 7  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) tqdw y.  
//{{AFX_MSG_MAP(CHookApp) 6I,^4U  
// NOTE - the ClassWizard will add and remove mapping macros here. M'Ec:p=X"  
// DO NOT EDIT what you see in these blocks of generated code! 4.?tP7UE  
//}}AFX_MSG_MAP I$Z8]&m  
END_MESSAGE_MAP() s d -5AE  
;MD6iBD  
CHookApp::CHookApp() ~zEBJgeyh  
{ xWNB/{F  
 // TODO: add construction code here, p#['CqP8  
 // Place all significant initialization in InitInstance I)@b#V=  
} LEnm6  
nP9zTa  
CHookApp theApp; UZsn14xSA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) d9'gH#f?  
{ |7 .WP;1  
 BOOL bProcessed=FALSE; IhIPy~Hgt  
 if(HC_ACTION==nCode) 7m{YWR0  
 { zq(R!a6  
  if((lParam&0xc0000000)==0xc0000000){// Key up !'E{D`A9  
   switch(wParam) HvhP9_MB  
   { LP_w6fjT  
    case VK_MENU: AOvn<Q  
     MaskBits&=~ALTBIT; Q?e]N I^  
     break; R?,Oh*  
    case VK_CONTROL: MiB"CcU  
     MaskBits&=~CTRLBIT; |2oCEb1  
     break; 3`V #ImV>  
    case VK_SHIFT: x  RV@ _  
     MaskBits&=~SHIFTBIT; Wnp\yx`  
     break; &y164xn'h  
    default: //judge the key and send message U _QCe+  
     break; zUw=e}?:  
   } $Tc"7nYu  
   for(int index=0;index<MAX_KEY;index++){ h]|E,!H  
    if(hCallWnd[index]==NULL) KW1 7CJ@  
     continue; I-=H;6w7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) cjTV~(i'4A  
    { U9uy (KOW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); :cx}I  
     bProcessed=TRUE; VR/*h%  
    } Het5{Yb.  
   } znNJ?  
  } 1:L _qL  
  else if((lParam&0xc000ffff)==1){ //Key down z?9vbx  
   switch(wParam) ]z^*1^u^ig  
   { 82mKI+9&"  
    case VK_MENU: vMDX  
     MaskBits|=ALTBIT; ]VarO'  
     break; yXuc< m  
    case VK_CONTROL: GS!7HphR  
     MaskBits|=CTRLBIT; H)eecH$K  
     break; a{oG[e   
    case VK_SHIFT: )Ha`>  
     MaskBits|=SHIFTBIT; aGUKpYF  
     break; yA74Rxl*6  
    default: //judge the key and send message G;^},%<  
     break; 9e`.H0  
   } ?9F_E+!  
   for(int index=0;index<MAX_KEY;index++) ~M>EB6  
   { PNjZbOmzS  
    if(hCallWnd[index]==NULL) {C% #r@6  
     continue; 9>@@W#TK~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) N-lo[bDJh  
    { dZMOgZ.!yr  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I U Mt^z  
     bProcessed=TRUE; I04GQql  
    } R F)Qsa  
   } Q9Y$x{R&  
  } @xO?SjH  
  if(!bProcessed){ gM0^k6bB8  
   for(int index=0;index<MAX_KEY;index++){ {iz,iv/U  
    if(hCallWnd[index]==NULL) :^G;`T`L  
     continue; ?Aewp$Bj  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) hkK+BmMj\  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  H[cHF  
   } j@j%)CCM  
  } *@EItj`  
 } UG]]Vk1d]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); C( ay7  
} M[;N6EJH  
yMJY6$Ct  
BOOL InitHotkey() 13:yaRo  
{ 0<,Q7onDD:  
 if(hHook!=NULL){ 1l8kuwH  
  nHookCount++; Z#2AK63/T  
  return TRUE; [(hB%x_"  
 } Fj0a+r,h!  
 else gwf *M3(  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); %XpYiW#AK  
  if(hHook!=NULL) @,Re<%\  
   nHookCount++; R5y+bMZ  
  return (hHook!=NULL); ))pp{X2m  
} {3jV ,S  
BOOL UnInit() `I\)Kk@*b9  
{ &#AK#`&)0i  
 if(nHookCount>1){ A3\%t@y  
  nHookCount--; 7 Q`'1oE?  
  return TRUE; CL~21aslI  
 } qtx5N)J6  
 BOOL unhooked = UnhookWindowsHookEx(hHook); v Ft]n  
 if(unhooked==TRUE){ x vi&d1  
  nHookCount=0; yf2I%\p}  
  hHook=NULL; w""5T|  
 } BFCF+hU^6R  
 return unhooked; @iW^OVpp<8  
} rm-6Az V  
4. &t  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -:5]*zVp+-  
{ :6,qp?/  
 BOOL bAdded=FALSE; Is87 9_Z  
 for(int index=0;index<MAX_KEY;index++){ efK)6T^p  
  if(hCallWnd[index]==0){ *kI1NchF  
   hCallWnd[index]=hWnd; A YC22(  
   HotKey[index]=cKey; }]qx "  
   HotKeyMask[index]=cMask;  Ji>  
   bAdded=TRUE; xaiA?  
   KeyCount++; tRqg')y  
   break; wbC'SOM  
  } \"E-z.wW=  
 } \X'{ ee  
 return bAdded; W6Os|z9&|  
} gFsnL*L0  
 2Z ? N  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 8:BPXdiK  
{ :QSCky*i  
 BOOL bRemoved=FALSE; /r4QDwu  
 for(int index=0;index<MAX_KEY;index++){ ~(TS>ck@  
  if(hCallWnd[index]==hWnd){ +sTZ) 5vQ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ #>SvYP  
    hCallWnd[index]=NULL; 8Nr,Wq  
    HotKey[index]=0; uW.)(l  
    HotKeyMask[index]=0; zUw9  
    bRemoved=TRUE; K%Sy~6iD&  
    KeyCount--; HWr")%EhD  
    break; a\wpJ|3{=T  
   } `_IgH  
  } MTKd:.J6  
 } Ax#$z  
 return bRemoved; N Fc@Kz<H  
} %"R|tlG  
MDfE(cn2q  
void VerifyWindow() ^#H%LLt  
{ |eEcEu?/b  
 for(int i=0;i<MAX_KEY;i++){ Pkr0| bs*  
  if(hCallWnd!=NULL){ VQ{.Ls2`Z  
   if(!IsWindow(hCallWnd)){ *k$":A  
    hCallWnd=NULL; M PMa  
    HotKey=0; =YPvh]][  
    HotKeyMask=0; a95QDz  
    KeyCount--; @:'swO/\<  
   } t83n`LC  
  } E%CJM+r!  
 } =O qw`jw  
} `+~@VZ3m  
%ZF6%m0S  
BOOL CHookApp::InitInstance() f IUz%YFn  
{ EJ*  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); qg;[~JZYKi  
 hins=AfxGetInstanceHandle(); Kt,ENbF  
 InitHotkey(); P:z5/??2S  
 return CWinApp::InitInstance(); i,=CnZCh  
} qDqgU  
r)jj]$0  
int CHookApp::ExitInstance() [.}-nAN  
{ :Mss"L820  
 VerifyWindow(); ^O cM)Z6h  
 UnInit(); N?d4Pu1m  
 return CWinApp::ExitInstance(); ;c5Q"  
} Z5/g\G[  
+zpmy3Q  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *g$egipfF  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) dm60O8  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ~F`t[p  
#if _MSC_VER > 1000 I!y[7^R  
#pragma once XgUvgJ  
#endif // _MSC_VER > 1000 y0Pr[XZ  
56Q9RU(M  
class CCaptureDlg : public CDialog o@}+b}R}  
{ *)c,~R^  
 // Construction J[:3H6%`  
 public: RVmD&  
  BOOL bTray; oWVlHAPj  
  BOOL bRegistered; !$'s?rnh  
  BOOL RegisterHotkey(); 4'pg>;*.  
  UCHAR cKey; n237%LH[  
  UCHAR cMask; GI}h )T  
  void DeleteIcon(); DCfV  
  void AddIcon(); PgZ~of&  
  UINT nCount; fL7ym,?  
  void SaveBmp(); ^Bihm] Aq  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor jP6;~[rl  
  // Dialog Data L 6){wQ%c  
  //{{AFX_DATA(CCaptureDlg) 8H_3.MK  
  enum { IDD = IDD_CAPTURE_DIALOG }; z<~gv"  
  CComboBox m_Key; p1p4t40<l  
  BOOL m_bControl; %J\1W"I?  
  BOOL m_bAlt; T!o 4k  
  BOOL m_bShift; rvRtR/*?j  
  CString m_Path; K#g)t/SZ  
  CString m_Number; $l:?(&u  
  //}}AFX_DATA P)~PrTa%  
  // ClassWizard generated virtual function overrides .}.5|z} A  
  //{{AFX_VIRTUAL(CCaptureDlg) iq`y  
 public: Sk@~}  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ,D-VC{lj  
 protected: V)\|I8"  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Y418k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 5Bw  
  //}}AFX_VIRTUAL W`] ,  
  // Implementation j'i-XIs  
 protected: DJlY~}v#_  
  HICON m_hIcon; :0pxacD"!  
  // Generated message map functions @Nb&f<+gi  
  //{{AFX_MSG(CCaptureDlg) :Vq gmn  
  virtual BOOL OnInitDialog(); ): C4"2l3  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Rxld$@~-(]  
  afx_msg void OnPaint(); Y[x9c0  
  afx_msg HCURSOR OnQueryDragIcon(); aX6.XHWbDf  
  virtual void OnCancel(); @AL,@P/9=  
  afx_msg void OnAbout(); ( B$;'U<  
  afx_msg void OnBrowse();  5I5~GH  
  afx_msg void OnChange(); G8"L #[~  
 //}}AFX_MSG  L's_lC  
 DECLARE_MESSAGE_MAP() =!r9;L,?  
}; 7,ODh-?ez  
#endif T$13"?sr=  
Mq]~Ka3q7  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 68R[Lc9q5  
#include "stdafx.h" >:5/V0;,  
#include "Capture.h" 3/o-\wWO  
#include "CaptureDlg.h" 2#5SI  
#include <windowsx.h> }NDw3{zn  
#pragma comment(lib,"hook.lib") @Y*ONnl  
#ifdef _DEBUG l"!.aIY"e  
#define new DEBUG_NEW YS k,kU  
#undef THIS_FILE H-?SlVsf  
static char THIS_FILE[] = __FILE__; oT$w14b  
#endif qR!SwG44+  
#define IDM_SHELL WM_USER+1 :<Y,^V(  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z<z(;)?c  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); IX;u+B  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; LJYFz=p "  
class CAboutDlg : public CDialog f&B&!&gZ  
{ 21M@z(q*  
 public: N54U [sy  
  CAboutDlg(); i;`r zsRb  
  // Dialog Data P-[6xu+]  
  //{{AFX_DATA(CAboutDlg) "zR+}  
  enum { IDD = IDD_ABOUTBOX }; Q/r9r*>z  
  //}}AFX_DATA nRN&u4  
  // ClassWizard generated virtual function overrides ~c,HE] B  
  //{{AFX_VIRTUAL(CAboutDlg) eiI}:5~ /g  
 protected: v7T05  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support [F%INl-sy  
  //}}AFX_VIRTUAL GUE 3|  
  // Implementation zn&NLsA  
 protected: Uaog_@2n,  
  //{{AFX_MSG(CAboutDlg) V9NE kS  
  //}}AFX_MSG $fV47;U'*  
  DECLARE_MESSAGE_MAP() 3D[IZ^%VtM  
}; ,95Nj h  
1XU sr;Wz  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) wlKfTJrn&  
{ EKhwrBjS  
 //{{AFX_DATA_INIT(CAboutDlg) U-#wFc2N  
 //}}AFX_DATA_INIT 5X4; (Qj  
} ;S+*s'e  
A#RA;Dt:  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) u)y6$  
{ EyA}  
 CDialog::DoDataExchange(pDX); :o?On/  
 //{{AFX_DATA_MAP(CAboutDlg) (e S4$$g  
 //}}AFX_DATA_MAP p)RASIB  
} 1|l'oTAA  
l_5]~N  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) \ " {+J  
 //{{AFX_MSG_MAP(CAboutDlg) uV`r_P  
 // No message handlers f1y3l1/  
 //}}AFX_MSG_MAP UUc{1"z{  
END_MESSAGE_MAP() Z0s}65BR  
zMxHJNQ\D  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) !E8y!|7$  
: CDialog(CCaptureDlg::IDD, pParent) Lqq RuKi  
{ 4*< x0  
 //{{AFX_DATA_INIT(CCaptureDlg) {Y6U%HG{{r  
  m_bControl = FALSE; <0g.<n,  
  m_bAlt = FALSE; RT HD2  
  m_bShift = FALSE; UUJbF$@;  
  m_Path = _T("c:\\"); eG* <=.E  
  m_Number = _T("0 picture captured."); tSran  
  nCount=0; Fy37I/#)r&  
  bRegistered=FALSE; 6^y*A!xY  
  bTray=FALSE; F9p'|-   
 //}}AFX_DATA_INIT 3cfW|J  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 t>"UenJt-  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); wO9|_.Z{  
} k#X~+}N^  
8Yc'4v#}  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ~o_0RB  
{ kk#%x#L[  
 CDialog::DoDataExchange(pDX); r0t4\d_&  
 //{{AFX_DATA_MAP(CCaptureDlg) E7X6Shng  
  DDX_Control(pDX, IDC_KEY, m_Key); -d5b,leC^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 5IE3[a%X  
  DDX_Check(pDX, IDC_ALT, m_bAlt); V,:^@ 7d  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); MIma:N_c  
  DDX_Text(pDX, IDC_PATH, m_Path); z#9Tg"8]  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 3'tcEFkH  
 //}}AFX_DATA_MAP Wd "<u2  
} ehCGu( =  
8*o*?1.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) `t[b0; 'OH  
//{{AFX_MSG_MAP(CCaptureDlg) q_iPWmf p*  
 ON_WM_SYSCOMMAND() c"D%c(:4|  
 ON_WM_PAINT() @'n07 5)h  
 ON_WM_QUERYDRAGICON() >}<1  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Nl/^ga  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ls[0X82F  
 ON_BN_CLICKED(ID_CHANGE, OnChange) "3Y(uN  
//}}AFX_MSG_MAP pGZiADT  
END_MESSAGE_MAP() D!7-(3R  
kIl!n  
BOOL CCaptureDlg::OnInitDialog() k7,   
{ 3Ye{a<ckK  
 CDialog::OnInitDialog(); Q$,AQyBlqc  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); JR6r3W  
 ASSERT(IDM_ABOUTBOX < 0xF000); l9{}nz  
 CMenu* pSysMenu = GetSystemMenu(FALSE); *G rYB6MT  
 if (pSysMenu != NULL) [vv $"$z  
 { lo!^h]iE!  
  CString strAboutMenu; M02 U,!di  
  strAboutMenu.LoadString(IDS_ABOUTBOX); W*2d!/;7>  
  if (!strAboutMenu.IsEmpty())  iYaS  
  { P;8nC:zL  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2WO5Af%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); w'uB&z4'  
  } '[WVP=M<XV  
 } XrUc`  
 SetIcon(m_hIcon, TRUE); // Set big icon jK^Q5iD  
 SetIcon(m_hIcon, FALSE); // Set small icon 'G>$W+lT^  
 m_Key.SetCurSel(0); n2A ; `=  
 RegisterHotkey(); }G/!9Zq  
 CMenu* pMenu=GetSystemMenu(FALSE); G)8v~=Bv  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;cEoc(<?  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 3xIelTf*  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9%Eo<+my h  
 return TRUE; // return TRUE unless you set the focus to a control ]9 $iUA%Ef  
} 6?(yMSKa  
r'(*#  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) q0C%">>1 #  
{ zq(4@S-TU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;\g0* b(  
 { X $2f)3  
  CAboutDlg dlgAbout; :%-w/QwTR  
  dlgAbout.DoModal(); [KL-T16  
 } S4U}u l  
 else 5szJ.!(  
 { ({3Ap{Q}  
  CDialog::OnSysCommand(nID, lParam); uv=a}U;  
 } 5OCt Q4u  
} A?bqDy  
h! Bg} B~  
void CCaptureDlg::OnPaint() OO2uE ;( 3  
{ VqUCcT  
 if (IsIconic()) }K^v Ujl  
 { GT7&>}FJ)  
  CPaintDC dc(this); // device context for painting ck< `kJ`b  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); h/Yxm2  
  // Center icon in client rectangle JZdRAL2#v  
  int cxIcon = GetSystemMetrics(SM_CXICON); 43 vF(<r&f  
  int cyIcon = GetSystemMetrics(SM_CYICON); k!ID  
  CRect rect; OqWm5(u&S  
  GetClientRect(&rect); Xs{PAS0  
  int x = (rect.Width() - cxIcon + 1) / 2; Uc,MZV4  
  int y = (rect.Height() - cyIcon + 1) / 2; +%f6{&q$  
  // Draw the icon + ZK U2N*  
  dc.DrawIcon(x, y, m_hIcon); !1Hs;K  
 } dF[|9%)  
 else %JHv2[r^P  
 { 3G[|4v?[<_  
  CDialog::OnPaint(); OwT_W)$  
 } xG;;ykh.]  
} #mU<]O  
HC} vO0X4  
HCURSOR CCaptureDlg::OnQueryDragIcon() h w ^ V  
{ 8_E(.]U  
 return (HCURSOR) m_hIcon; U)xebU.!S  
} 1tq ^W'  
D>8p: ^3g  
void CCaptureDlg::OnCancel() q9dplEe5  
{ suzK)rJ9i  
 if(bTray) "F}dZ  
  DeleteIcon(); q1q 9W@H  
  CDialog::OnCancel(); L2p?] :-  
} 7H09\g&  
Yn[>Y)  
void CCaptureDlg::OnAbout() /* qx5$~  
{ w\MWr+4  
 CAboutDlg dlg; cxQAp  
 dlg.DoModal(); %*szB$ [3  
} z"T+J?V/  
HAL\j 5i  
void CCaptureDlg::OnBrowse() up+0-!AH  
{ ~&<t++ g  
 CString str; tT!' qL.*  
 BROWSEINFO bi; Lu {/"&)  
 char name[MAX_PATH]; ]\KVA)\  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Pn^`_  
 bi.hwndOwner=GetSafeHwnd(); PDPK|FU  
 bi.pszDisplayName=name; p3Qls*  
 bi.lpszTitle="Select folder"; :A z lls  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; u178vby;l  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); dVYY:1PS  
 if(idl==NULL) V]; i$  
  return; {?`7D:]`^  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); $1 "gFg  
 str.ReleaseBuffer(); -Uy)=]Zae  
 m_Path=str; ~CT]&({  
 if(str.GetAt(str.GetLength()-1)!='\\') :>.{w$Ln%  
  m_Path+="\\"; .n1&Jsey  
 UpdateData(FALSE); *ma w`1  
} 4VZI]3K,  
XrM+DQ;  
void CCaptureDlg::SaveBmp() 4/|x^Ky>G  
{ {=3A@/vM  
 CDC dc; J/'Fj?  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ?[d4HKs  
 CBitmap bm; l>K+4  
 int Width=GetSystemMetrics(SM_CXSCREEN); &muBSQ-  
 int Height=GetSystemMetrics(SM_CYSCREEN); [:{ FR2*x  
 bm.CreateCompatibleBitmap(&dc,Width,Height); PkrVQH9^w  
 CDC tdc; g%l ,a3"  
 tdc.CreateCompatibleDC(&dc); |J,zU6t  
 CBitmap*pOld=tdc.SelectObject(&bm); &RYdSXM  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); aaig1#a@1b  
 tdc.SelectObject(pOld); tO{{ci$-T  
 BITMAP btm; !{r2`d09n)  
 bm.GetBitmap(&btm); La )M  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; y62f{ks_/  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 8j;Un]  
 BITMAPINFOHEADER bih; @KK6JyOTQ  
 bih.biBitCount=btm.bmBitsPixel; A|8"}Hm  
 bih.biClrImportant=0; 84QOW|1  
 bih.biClrUsed=0; m;~}}~&vQ  
 bih.biCompression=0; fr/EkL1Dl  
 bih.biHeight=btm.bmHeight; w2.] 3QAZ  
 bih.biPlanes=1; #+1|O;PB#  
 bih.biSize=sizeof(BITMAPINFOHEADER); )vS0Au^C~  
 bih.biSizeImage=size; fgd2jr 3T  
 bih.biWidth=btm.bmWidth; 04-_ K  
 bih.biXPelsPerMeter=0; EL`|>/[J  
 bih.biYPelsPerMeter=0; [*^.$s(  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); aO(PVS|P  
 static int filecount=0; ?9()ya-TE  
 CString name; ?YW~7zG  
 name.Format("pict%04d.bmp",filecount++); bI &<L O  
 name=m_Path+name; K>DN6{hnV;  
 BITMAPFILEHEADER bfh; QFx3N%  
 bfh.bfReserved1=bfh.bfReserved2=0; Ax&!Nz+?  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Ncz4LKzt  
 bfh.bfSize=54+size; T&_&l;syA  
 bfh.bfOffBits=54; k`m7j[A]l  
 CFile bf; h.X4x2(.  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wnokP  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 8X,6U_>#a  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); G$>?UQ[  
  bf.WriteHuge(lpData,size); *)Qv;'U=rn  
  bf.Close(); Q-w# !<L.  
  nCount++; =:&xdphZ+  
 } mLuNl^)3  
 GlobalFreePtr(lpData); W<)P@_+-  
 if(nCount==1) 8:{id>Mm^  
  m_Number.Format("%d picture captured.",nCount); PyQ .B*JJ  
 else @PvO;]]%  
  m_Number.Format("%d pictures captured.",nCount); "Au4&Fu  
  UpdateData(FALSE); j9NF|  
} !kE5]<H\  
eB5>uKa  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 6j(/uF4!#  
{ bgor W"'  
 if(pMsg -> message == WM_KEYDOWN) Ocdy;|&  
 { R])Eg&  
  if(pMsg -> wParam == VK_ESCAPE) 5.6tVr  
   return TRUE; N[/<xW~x?4  
  if(pMsg -> wParam == VK_RETURN) FW|& iS$  
   return TRUE; 6YM X7G]  
 } U+!RIF[Je  
 return CDialog::PreTranslateMessage(pMsg); %4*c/ c6  
} 5%Qxx\q  
StI N+S@Z  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) RM|J |R  
{ \(Sly&gL  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ *9j'@2!M  
  SaveBmp(); ;R*-cm  
  return FALSE; ]rlZP1".  
} 1b9S";ct0  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ O@Aazc5K  
 CMenu pop; p1KhI;^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); b&rBWp0#  
 CMenu*pMenu=pop.GetSubMenu(0); t$!zgUJ  
 pMenu->SetDefaultItem(ID_EXITICON); /whaY4__O\  
 CPoint pt; e S8(HI6{^  
 GetCursorPos(&pt); 8 Rj5~+5  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Ms!EK  
 if(id==ID_EXITICON) g"P%sA/E+  
  DeleteIcon(); P~\rP6 ;  
 else if(id==ID_EXIT) k+h}HCzE  
  OnCancel(); o+1 (N#?m9  
 return FALSE; G8M~}I/)  
} P)Adb~r  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8oX1 F(R  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) d1D f`  
 AddIcon(); k$kE5kh,S  
 return res; Ypyi(_G(?>  
} v?`R8  
W>pe-  
void CCaptureDlg::AddIcon() l?m"o-Gp3  
{ 0nwi5  
 NOTIFYICONDATA data; {lds?AuK  
 data.cbSize=sizeof(NOTIFYICONDATA); ^Hn}\5  
 CString tip; TUp\,T^2  
 tip.LoadString(IDS_ICONTIP); ]K(a32VCH  
 data.hIcon=GetIcon(0); |Rf j 0+  
 data.hWnd=GetSafeHwnd(); i-CJ{l  
 strcpy(data.szTip,tip); b-& rMML  
 data.uCallbackMessage=IDM_SHELL; bbC@  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; )O[8 D  
 data.uID=98; { I{ 0rV  
 Shell_NotifyIcon(NIM_ADD,&data); H:(B^uH  
 ShowWindow(SW_HIDE); NN4Z:6W5  
 bTray=TRUE; !`{?qQ[=  
} Wg}KQ6 6  
d'_q9uf'  
void CCaptureDlg::DeleteIcon() +~"IF+T RH  
{ H9T~7e+  
 NOTIFYICONDATA data; tiZ H;t';<  
 data.cbSize=sizeof(NOTIFYICONDATA); ei= 4u'  
 data.hWnd=GetSafeHwnd(); Z|qI[uiO  
 data.uID=98; ?\\wLZ  
 Shell_NotifyIcon(NIM_DELETE,&data); MD[hqshoh  
 ShowWindow(SW_SHOW); dy6zrgxygP  
 SetForegroundWindow(); .BP d06y  
 ShowWindow(SW_SHOWNORMAL); ^(;x-d3  
 bTray=FALSE; NO*, }aeG  
} goR_\b SU  
#4AU&UM+i  
void CCaptureDlg::OnChange() ?i<l7   
{ 5X0ex.  
 RegisterHotkey(); 7@{%S~TN  
} Be{@ L  
?w/p 9j#  
BOOL CCaptureDlg::RegisterHotkey() I!/EQO|  
{ j}Tv/O,f  
 UpdateData(); H r:*p6  
 UCHAR mask=0; 9'( _*KSH  
 UCHAR key=0; !/}4_s`,  
 if(m_bControl) s`x2Go  
  mask|=4; />xEpR3_A  
 if(m_bAlt) yD<#Q\,  
  mask|=2; 3Y P! B=  
 if(m_bShift) 2[Bbdg[O  
  mask|=1; cs2-jbRn  
  key=Key_Table[m_Key.GetCurSel()]; z 4}"oQk:r  
 if(bRegistered){ [ &Wy $  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); }e7/F[c.U  
  bRegistered=FALSE; yl>^QMmo  
 } lz=DGm  
 cMask=mask; g;Fd m5Q  
 cKey=key; |e8A)xM]wC  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); UusAsezm:  
 return bRegistered; ky !Z JR  
} 5{-Hg[+9  
*`OXgkQ  
  四、小结 OC5oxL2HTe  
,% yC4  
  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