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
  • 7421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: %o+bO}/9  
  oBKZ$&_h  
  一、实现方法 H\^5>ccU>V  
C=%go1! $  
  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: <~X=6  
M8S4D&vpD4  
#pragma data_seg("shareddata") fs>0{  
HHOOK hHook =NULL; //钩子句柄 lKH"PH7*_w  
UINT nHookCount =0; //挂接的程序数目 u+th?KO`  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 |WubIj*\{  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ?ix0n,m  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey QF[9Zn  
static int KeyCount =0; q w|M~vdm  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 l<z[)fE{uS  
#pragma data_seg() Kq6m5A]z  
~iF*+\  
  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。 Jg;Hg[  
i!YZF$|  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: +zz9u?2C`  
>JCSOI  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Odw SNG  
cKey,UCHAR cMask) @RbAC*Y]g  
{ ~~ )&? \N  
 BOOL bAdded=FALSE; >,hJ5-9  
 for(int index=0;index<MAX_KEY;index++){ XD%?'uUQ_  
  if(hCallWnd[index]==0){ HRx#}hN?+  
   hCallWnd[index]=hWnd; ;#fB=[vl";  
   HotKey[index]=cKey; gEU)UIJ  
   HotKeyMask[index]=cMask; 6sB!m|zm]:  
   bAdded=TRUE; pN4!*7M  
   KeyCount++; ]DC]=F.  
   break; rv|k8  
  } "eh"' Z  
 } \+L_'*&8  
 return bAdded; J,m.LpY  
} .$v]B xu  
//删除热键 :Q$3P+6a  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) f_.1)O'83  
{ gtjgC0   
 BOOL bRemoved=FALSE; EsA^P2?_+  
 for(int index=0;index<MAX_KEY;index++){ Q7c_;z_  
  if(hCallWnd[index]==hWnd){ bp$8hUNYz-  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ?_n.B=H`8  
    hCallWnd[index]=NULL; },[S9I`p  
    HotKey[index]=0; uvD 6uIW<  
    HotKeyMask[index]=0; % ,~; w0  
    bRemoved=TRUE; JR7~|ov  
    KeyCount--; A[+op'>k  
    break; as o8  
   }  LFGu|](  
  } ,,BNUj/:  
 } lh?mN3-*  
 return bRemoved; 0FTiTrTn  
} y~ ^>my7G  
V~e1CZ(2X  
0#Rj[J;kh  
  DLL中的钩子函数如下: zS?i@e $  
:CK,(?t  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) pklcRrx,a  
{ b'vJPv~hI  
 BOOL bProcessed=FALSE; Nmi#$K[x  
 if(HC_ACTION==nCode) {fIH9+v  
 { Im6ymaf9  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 HT1bsY 0t  
   switch(wParam) sPc\xY  
   {  \hNMTj#O  
    case VK_MENU: =Ee f  
     MaskBits&=~ALTBIT; u!L8Sv  
     break; PO)5L  
    case VK_CONTROL: b2p<!?  
     MaskBits&=~CTRLBIT; DB?_E{y]  
     break; <JZ=K5  
    case VK_SHIFT: L=HL1Qe$G]  
     MaskBits&=~SHIFTBIT; -6t# ?Dkc'  
     break; rw+0<r3|K  
    default: //judge the key and send message nR"k %$  
     break; .fD k5uo  
   } QfwGf,0p  
   for(int index=0;index<MAX_KEY;index++){ 3P-#NL  
    if(hCallWnd[index]==NULL) ' P-K}Y  
     continue; 9iS3.LCfX  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  pLyX9C  
    { unD8h=Z2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o/=K:5  
     bProcessed=TRUE; $I1p"6  
    } \?qXscq  
   } _}JygOew  
  } rR C3^X`u  
  else if((lParam&0xc000ffff)==1){ //有键按下 X]y3~|K  
   switch(wParam) rM>&! ?y+  
   { ;'J L$=  
    case VK_MENU: /=7|FtB`  
     MaskBits|=ALTBIT; "#e2"=3*  
     break; XTZWbhNF  
    case VK_CONTROL: *j <;;z-  
     MaskBits|=CTRLBIT; LGod"8~U  
     break; UbQeN  
    case VK_SHIFT: 7*[>e7:A  
     MaskBits|=SHIFTBIT; 6e~+@S  
     break; j&8 ~X2?*  
    default: //judge the key and send message WQ"ZQ  
     break; #NL1N_B  
   } zROyG  
   for(int index=0;index<MAX_KEY;index++){ D-,sF8{ i  
    if(hCallWnd[index]==NULL) cteHuRd  
     continue; |'KNR]: N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ?pQ, 5+8  
    { }T(|\ X  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vBM\W%T|d  
     bProcessed=TRUE; ?0_i{BvN  
    } tbOe,-U-@  
   } ( !Ml2  
  } P<2yCovn`  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 xsAF<:S\  
   for(int index=0;index<MAX_KEY;index++){ r-Dcc;+=Q  
    if(hCallWnd[index]==NULL) !uHI5k,f  
     continue; #UXmTrZ.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) CT"0"~~  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); %Yd}},X_E  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 % )|/s %W  
   } k?xtZ,n{s  
  } Bpk%,*$*)  
 } 8q tNK> D  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "Ny_RF  
} a`|/*{  
1 !\pwd@{  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: UdLC]  
G.oaDGy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E,C<ox4e  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); fylaH(LER  
cwpDad[Kx  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: da[l[b;  
sDbALAp +  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _0vXujz  
{ Hs-NP#I  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) )n0g6  
 { %8 4<@f&n]  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 '`3-X];p  
  SaveBmp(); Ogjjjy84vM  
  return FALSE; &"^A  
 } t-E'foYfr`  
 …… //其它处理及默认处理 gXH89n  
} DI$z yj~3  
EkTen:{G  
P, S9gG9  
  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。 H_*]Vg  
f-{[ushj  
  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。 IndNR:"g  
EO| kiC   
  二、编程步骤 `_v-Y`Z  
S?8q.59  
  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"; H!45w;,I  
h_CeGl!M}  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; !J:DBtGT  
OEAF.  
  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; 0p[$8SCJ  
"&2D6  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; UiYA#m  
*~:@xMa  
  5、 添加代码,编译运行程序。 ;UWdT]>!?  
nt5 ~"8  
三、程序代码 BO{J{  
L;z-,U$;%R  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL _<3:vyfdC  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) N?pD"re)6  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ oW/&X5  
#if _MSC_VER > 1000 xH' H! 8  
#pragma once +Oyt   
#endif // _MSC_VER > 1000 Qy3e ,9nS  
#ifndef __AFXWIN_H__ q2hZ1o  
#error include 'stdafx.h' before including this file for PCH x b_C1n  
#endif 4&$G;?#W2  
#include "resource.h" // main symbols b1 KiO2 E  
class CHookApp : public CWinApp A: @=?(lI3  
{ >?$Ze@  
 public: @u$oqjK  
  CHookApp(); <B`=oO%o  
  // Overrides n%?g+@y,^  
  // ClassWizard generated virtual function overrides O~t5qnu/}  
  //{{AFX_VIRTUAL(CHookApp) 0{B5C[PTG  
 public: L50`,,WF  
  virtual BOOL InitInstance(); [tBIABr  
  virtual int ExitInstance(); tDi=T]-bt  
  //}}AFX_VIRTUAL %9zcc)cP  
  //{{AFX_MSG(CHookApp) m' aakq  
  // NOTE - the ClassWizard will add and remove member functions here. G! 87F/  
  // DO NOT EDIT what you see in these blocks of generated code ! I O6i  
  //}}AFX_MSG s*!2oj  
  DECLARE_MESSAGE_MAP() jf$t  
}; ".@SQgyb0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); g`&pQ%|=  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :V_$?S  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); goHr# @  
BOOL InitHotkey(); IXg${I}_Q  
BOOL UnInit(); glv(`cQ  
#endif S`*al<m  
'Lm.`U  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. $9l3 DJ  
#include "stdafx.h" F1,pAtA  
#include "hook.h"  NOQgkN  
#include <windowsx.h> p@Qzg /X  
#ifdef _DEBUG aFC3yMKXh  
#define new DEBUG_NEW rgP$\xn-  
#undef THIS_FILE h]zx7zt-  
static char THIS_FILE[] = __FILE__; \Xkx`C  
#endif i3Ffk+ |b  
#define MAX_KEY 100 l"cO@.T3  
#define CTRLBIT 0x04 \dfq& oyU\  
#define ALTBIT 0x02 =a {Z7W  
#define SHIFTBIT 0x01 }`h}h<B(  
#pragma data_seg("shareddata") gB0)ec 0  
HHOOK hHook =NULL; :#gz)r  
UINT nHookCount =0; OOv"h\,  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey \]r{73C  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |MBnRR  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey (Hn,}(3S  
static int KeyCount =0; h{h=',o1  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Cu`ZgK LQ  
#pragma data_seg() c~tkY!c  
HINSTANCE hins; 2'x_zMV  
void VerifyWindow(); P, Vq/Tt  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) j$L<9(DoR  
//{{AFX_MSG_MAP(CHookApp) xw=B4u'z  
// NOTE - the ClassWizard will add and remove mapping macros here. A2+t`[ w  
// DO NOT EDIT what you see in these blocks of generated code! d?S<h`{x   
//}}AFX_MSG_MAP 7C 4Njei"  
END_MESSAGE_MAP() Np=*B_ @8  
%`}Qkb/Lyh  
CHookApp::CHookApp() wIY#TBu  
{ !W3Le$aL  
 // TODO: add construction code here, -bj1y2)n  
 // Place all significant initialization in InitInstance D'2O#Rj4q  
} cw^FOV*  
0<s)xaN>Y  
CHookApp theApp; [t6)M~&e:_  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) wo_FM `@  
{ a;h:o>Do5  
 BOOL bProcessed=FALSE; o%|1D'f^  
 if(HC_ACTION==nCode) K]7@%cS  
 { |C(72t?K  
  if((lParam&0xc0000000)==0xc0000000){// Key up "qDEI}  
   switch(wParam) .&[nS<~`  
   { L?Lp``%bI7  
    case VK_MENU: $GPA6  
     MaskBits&=~ALTBIT; j&&^PH9ZY  
     break; ct]5\g?U'  
    case VK_CONTROL: Y]n^(V  
     MaskBits&=~CTRLBIT; 4+W}TKw  
     break; V3`*LU  
    case VK_SHIFT: "Srp/g]a  
     MaskBits&=~SHIFTBIT; G!Uq#l>  
     break; s/T5aJR  
    default: //judge the key and send message Dnp^yqz*  
     break; huQ1A0(no  
   } pH*L8tT  
   for(int index=0;index<MAX_KEY;index++){ O{dx+f  
    if(hCallWnd[index]==NULL) 2N]y)S_<V  
     continue; <<`."RY#0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M.128J+xfS  
    { -S|L+">=Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,{oANqP  
     bProcessed=TRUE; d3![b1  
    } |MRxm"]A   
   } $rlIJwqn  
  } X;0EgIqh3  
  else if((lParam&0xc000ffff)==1){ //Key down Tru`1/ 7I  
   switch(wParam) ML'R[~|  
   { 6-JnT_  
    case VK_MENU: iFHVr'Og'  
     MaskBits|=ALTBIT; 2 Sr'B;`p  
     break; S\ li<xl  
    case VK_CONTROL: Dho~6K }"  
     MaskBits|=CTRLBIT; g =%W"v  
     break; N2~z&y8.  
    case VK_SHIFT: I%(+tJ  
     MaskBits|=SHIFTBIT; 3oIoQj+D  
     break; B02~/9*Y"  
    default: //judge the key and send message )V>FU=  
     break; r|#4+'  
   } \UE9Ff+{  
   for(int index=0;index<MAX_KEY;index++) Cr[#D$::`  
   { s9'iHe  
    if(hCallWnd[index]==NULL) a{8GT2h`4  
     continue; wj?f r?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) oFsMQ Py  
    { OI-%Ig%C#l  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ,wFLOfV@  
     bProcessed=TRUE; 7<KRB\)b&  
    } -kJF@w6u  
   } [mwfgh&4%  
  } ~pw_*AN  
  if(!bProcessed){ d_yqmx?w  
   for(int index=0;index<MAX_KEY;index++){ XRz.R/  
    if(hCallWnd[index]==NULL) ` Y ut 1N  
     continue; p"X\]g^jA>  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) VJNPs6  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L,l+1`Jz  
   } Gm|QOuw  
  } Jsw<,uT D  
 } A1Zu^_y'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ZWr\v!4  
} \"lzmxe0p  
Z c"]Cv(  
BOOL InitHotkey() 7_{x '#7  
{ 7.=u:PK7kM  
 if(hHook!=NULL){ a;lCr|*  
  nHookCount++; `=\G>#p<T  
  return TRUE; ;j(xrPNb  
 } cis ~]x%  
 else 0 @ ,@  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  10DS  
  if(hHook!=NULL) %d=-<EQ|&  
   nHookCount++; )8vcg{b{d  
  return (hHook!=NULL); s_kI\w4(x1  
} M'g4alS  
BOOL UnInit() 6znm?s@~  
{ bc 0|tJc  
 if(nHookCount>1){ ~\Ynih  
  nHookCount--; &B3kzs  
  return TRUE; .f6_[cS;g  
 } d~n+Ds)%F  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 6\]-J*e>  
 if(unhooked==TRUE){ Pjx9@i  
  nHookCount=0; .*,Zh2eXU  
  hHook=NULL; ;ndg,05_  
 } 6?t5g4q*nn  
 return unhooked; GY4yZa  
} e;gf??8}  
))MP]j9 T  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) BY 1~\M  
{ omY?`(=  
 BOOL bAdded=FALSE; |6uEf/*DX  
 for(int index=0;index<MAX_KEY;index++){ > Euput\  
  if(hCallWnd[index]==0){ qNvKlwR9;k  
   hCallWnd[index]=hWnd; a'A0CQ  
   HotKey[index]=cKey; 6)?TWr'Ke  
   HotKeyMask[index]=cMask; 8pk5[=3Z  
   bAdded=TRUE; U?}Maf  
   KeyCount++; +wio:==  
   break; ?Z.YJXoKZ  
  } JlH|=nIaj6  
 } } K Ou  
 return bAdded; WTd}) s  
} `|v#x@s  
&"CS1P|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ck^Z,AKL+  
{ 6Z'zB&hM}  
 BOOL bRemoved=FALSE; p;'vOb  
 for(int index=0;index<MAX_KEY;index++){ )WzCUYE1/  
  if(hCallWnd[index]==hWnd){ qVY\5`f@  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ w68qyG|wM  
    hCallWnd[index]=NULL; Tq?W @DM*  
    HotKey[index]=0; tC&y3!k2jR  
    HotKeyMask[index]=0; wUSWB{y  
    bRemoved=TRUE; } M1<a4~  
    KeyCount--; 7>4t{aRf_8  
    break; ](W #Tj5-  
   } gF:wdcO  
  } A^m hPBT_  
 } 0(..]\p^d  
 return bRemoved; J 5\> 8I,a  
} O}%=c\Pb  
<Q8bn?Z  
void VerifyWindow() _}\&;  
{ 8(+X0}  
 for(int i=0;i<MAX_KEY;i++){ Psv-y  
  if(hCallWnd!=NULL){ ]:f1r8<3p  
   if(!IsWindow(hCallWnd)){ Z@*Z@]FC  
    hCallWnd=NULL; "q%)we  
    HotKey=0; SnXLjJe  
    HotKeyMask=0; :_^YEm+A  
    KeyCount--; 9 V;m;sz  
   } ]~oM'?&!  
  } Rp|:$5&nE  
 } "C.$qk]  
} _%>.t  
R@EFG%|`_  
BOOL CHookApp::InitInstance() Vt&I[osC  
{ *r_.o;6  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 7eO8cPy  
 hins=AfxGetInstanceHandle(); I?:V EN:  
 InitHotkey(); |;].~7^  
 return CWinApp::InitInstance(); 44]ae~@a  
} ^a]i&o[c  
{wm  `  
int CHookApp::ExitInstance() ZzE&?  
{ oNdO@i%.q4  
 VerifyWindow(); I/(`<s p  
 UnInit(); 81KtK[?b  
 return CWinApp::ExitInstance(); ~7k b4[  
} 1|%$ie  
7,jqA"9  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file b_LzG_n!   
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \K4m~e@!  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ZqhINM*Rm  
#if _MSC_VER > 1000 k82'gJ;MC=  
#pragma once n2QD*3i  
#endif // _MSC_VER > 1000 H#ihU3q  
;P{ *'@  
class CCaptureDlg : public CDialog 4bKZ@r%  
{ *zx;81X=  
 // Construction v14[G@V~\  
 public: x_Z~k  
  BOOL bTray; 6ZM<M7(V  
  BOOL bRegistered; @3G3l|~>  
  BOOL RegisterHotkey(); K>q,?x b  
  UCHAR cKey; ~!uK;hI  
  UCHAR cMask; fpqKa r  
  void DeleteIcon(); D/)xe:  
  void AddIcon(); _Ih~'Y Fd  
  UINT nCount; abK/!m[q  
  void SaveBmp(); i.#s'm.9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor IQ|~d08}  
  // Dialog Data t]m#k%)  
  //{{AFX_DATA(CCaptureDlg) \0:l9;^4  
  enum { IDD = IDD_CAPTURE_DIALOG }; F |GWYw'%  
  CComboBox m_Key; yZ2,AR%  
  BOOL m_bControl; MdPwuXI  
  BOOL m_bAlt; ik]UzB  
  BOOL m_bShift; 5n"'M&Ce  
  CString m_Path; oo qNPLa  
  CString m_Number; LPXwfEHOm  
  //}}AFX_DATA h?SUDk:2^  
  // ClassWizard generated virtual function overrides f{vnZ|WD  
  //{{AFX_VIRTUAL(CCaptureDlg) 4f>Vg$4  
 public: qzH97<M}T  
  virtual BOOL PreTranslateMessage(MSG* pMsg); > vahj,CZZ  
 protected: r"4:aKF>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support $V+ze*ra  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); r9QNE>UG  
  //}}AFX_VIRTUAL nqV7Db~  
  // Implementation 's9)\LS>p  
 protected: <vAg\Tv:S  
  HICON m_hIcon; p'R}z|d)  
  // Generated message map functions Q[k}_1sWs$  
  //{{AFX_MSG(CCaptureDlg) r+U-l#Q  
  virtual BOOL OnInitDialog(); KUp lN1Sy  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); K 4 >d  
  afx_msg void OnPaint(); ?2i``-|Wa  
  afx_msg HCURSOR OnQueryDragIcon(); cL}g7D  
  virtual void OnCancel(); 08twcY;&k  
  afx_msg void OnAbout(); )D@ NX/}  
  afx_msg void OnBrowse(); ,,6e }o6  
  afx_msg void OnChange(); Nc7YMxk'H  
 //}}AFX_MSG .IgCC_C9  
 DECLARE_MESSAGE_MAP() p3-sEIw}Ru  
}; w</kGK[O  
#endif @1kA%LLK  
{>~|xW  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file x;C\G`9N  
#include "stdafx.h" ge E7<"m%  
#include "Capture.h" .qHgQ_%  
#include "CaptureDlg.h" r..Rh9v/=E  
#include <windowsx.h> ;MO %))  
#pragma comment(lib,"hook.lib") i JQS@2=A  
#ifdef _DEBUG :0]KIybt  
#define new DEBUG_NEW vm Hf$rq  
#undef THIS_FILE t n}9(Oa)  
static char THIS_FILE[] = __FILE__; vb$k/8JK  
#endif N (43+  
#define IDM_SHELL WM_USER+1 @NNN&%  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 0R; ;ou  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Gz kf  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; z,^baU  
class CAboutDlg : public CDialog ,H|V\\  
{ Iz  ,C!c  
 public: \oaO7w,:"  
  CAboutDlg(); yDHH05Yl  
  // Dialog Data p( z.[  
  //{{AFX_DATA(CAboutDlg) [rf.P'p%  
  enum { IDD = IDD_ABOUTBOX }; JWEqy+,Fjw  
  //}}AFX_DATA K)&AR*Tc  
  // ClassWizard generated virtual function overrides |{Oe&j3|  
  //{{AFX_VIRTUAL(CAboutDlg) VkUMMq{  
 protected: +.zriiF]i  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support D V C};  
  //}}AFX_VIRTUAL uu'~[SZlL  
  // Implementation n}YRE`>D  
 protected: r% qgLP{v  
  //{{AFX_MSG(CAboutDlg) 7q(RQQp  
  //}}AFX_MSG >y2gfD  
  DECLARE_MESSAGE_MAP() O>}aK.H  
}; 3Hr ZN+D  
tNq~M  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \# #~Tq  
{ 3p")  
 //{{AFX_DATA_INIT(CAboutDlg) 0dXWy`Mn  
 //}}AFX_DATA_INIT XC~|{d  
} A?Uyj  
0*+i~g,Kl@  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) g_-Y- .M  
{ sv =6?uYW  
 CDialog::DoDataExchange(pDX); [ibnI2I]`  
 //{{AFX_DATA_MAP(CAboutDlg) Q xKC5`1  
 //}}AFX_DATA_MAP -cOLg rmp  
} A5z5e# ,u  
N U\B  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rZ *}jD[  
 //{{AFX_MSG_MAP(CAboutDlg) !hEt UF  
 // No message handlers )$Mgp *?  
 //}}AFX_MSG_MAP Ia[e 7  
END_MESSAGE_MAP() 1_f(;WOg  
l&[x)W  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/)   Lxs  
: CDialog(CCaptureDlg::IDD, pParent) #5=Yg5   
{ PjDYdT[  
 //{{AFX_DATA_INIT(CCaptureDlg) h>q& X4-  
  m_bControl = FALSE; }c$Zlb  
  m_bAlt = FALSE; XZ}]H_, n  
  m_bShift = FALSE; Q.@9"&)t  
  m_Path = _T("c:\\"); YG$Y4h" @"  
  m_Number = _T("0 picture captured."); jq%Qc9y  
  nCount=0; 3u _[=a  
  bRegistered=FALSE; /0@'8f\I  
  bTray=FALSE; 0]fzjiaGt  
 //}}AFX_DATA_INIT 3+0 $=ef  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 R>yoMk/u  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); /n&w|b%  
} G D$o |l]\  
0M>+.}e+  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) VPet1hAy  
{ EH=[!iW;  
 CDialog::DoDataExchange(pDX); X6kCYTJYF  
 //{{AFX_DATA_MAP(CCaptureDlg) 4Un(}P'   
  DDX_Control(pDX, IDC_KEY, m_Key); S&q@M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); Mnc9l ^  
  DDX_Check(pDX, IDC_ALT, m_bAlt); b:SjJA,HM  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); nd}[X[ay  
  DDX_Text(pDX, IDC_PATH, m_Path); w9G (^jS6  
  DDX_Text(pDX, IDC_NUMBER, m_Number); =# <!s!  
 //}}AFX_DATA_MAP JgEPzHgx  
} ">@]{e*  
`O5w M\Z  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [RoOc)u  
//{{AFX_MSG_MAP(CCaptureDlg) VG_ PBG(  
 ON_WM_SYSCOMMAND() AAb3Jf`UW  
 ON_WM_PAINT() & =)HPzC  
 ON_WM_QUERYDRAGICON() ]QlgVw,  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) hxZ5EKBy  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) {CdQ)|  
 ON_BN_CLICKED(ID_CHANGE, OnChange) I6S!-i  
//}}AFX_MSG_MAP !{>'jvH  
END_MESSAGE_MAP() jJml[iC  
5_!s\5  
BOOL CCaptureDlg::OnInitDialog() *j6K QZ"  
{ 0}$Zr*|;Y  
 CDialog::OnInitDialog(); B<zoa=  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); >g+yw1nC  
 ASSERT(IDM_ABOUTBOX < 0xF000); OX-t#R`  
 CMenu* pSysMenu = GetSystemMenu(FALSE); P{-j ^'y  
 if (pSysMenu != NULL) 4YX/=  
 { /H3z~PBa  
  CString strAboutMenu; U[,."w]T  
  strAboutMenu.LoadString(IDS_ABOUTBOX); iHBetkAu  
  if (!strAboutMenu.IsEmpty()) H65><38X/  
  { mE\sD<b  
   pSysMenu->AppendMenu(MF_SEPARATOR); D<U^FT  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); M#Kke9%2  
  } 4z%::?  
 } l1HMH?0|  
 SetIcon(m_hIcon, TRUE); // Set big icon jlXzfD T  
 SetIcon(m_hIcon, FALSE); // Set small icon v#c'p^T  
 m_Key.SetCurSel(0); Td(eNe_4T  
 RegisterHotkey(); & 6 wD  
 CMenu* pMenu=GetSystemMenu(FALSE); = p{55dR  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Pu>jECcz  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >>bsr#aJ  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); +-2o b90_m  
 return TRUE; // return TRUE unless you set the focus to a control : 8h\x  
} -Y>,\VEK  
v]{F.N  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) vxE#6  
{ `xv2,Z9<  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) }$%j}F{  
 { MD|T4PPz,}  
  CAboutDlg dlgAbout; Z uFk}R"x  
  dlgAbout.DoModal(); ?TWve)U  
 } *^ aEUp6&  
 else h @AKfE!\~  
 { )SU\s+"M  
  CDialog::OnSysCommand(nID, lParam); hQ7-m.UZw  
 } 4*Uzomb?q  
} fab. %$  
w}|XSJ!  
void CCaptureDlg::OnPaint() HKp|I%b]J  
{ UlP2VKM1&  
 if (IsIconic()) S3oyx#R('O  
 { aQ.QkM Z  
  CPaintDC dc(this); // device context for painting ]w,:T/Z}  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); !WS Y75  
  // Center icon in client rectangle *Ri\7CqU"6  
  int cxIcon = GetSystemMetrics(SM_CXICON); \3"jW1Wb  
  int cyIcon = GetSystemMetrics(SM_CYICON); }_mVXjF  
  CRect rect; P K+rr.k]  
  GetClientRect(&rect); 0Wkk$0h9  
  int x = (rect.Width() - cxIcon + 1) / 2; (1IYOlG4  
  int y = (rect.Height() - cyIcon + 1) / 2; #)r^ZA&E  
  // Draw the icon Q HU|aC{r  
  dc.DrawIcon(x, y, m_hIcon); \<ko)I#%  
 } p~'iK4[&6  
 else >V%lA3  
 { 6;:z?Q  
  CDialog::OnPaint(); =e)t,YVm  
 } pq"Z,9,F%  
} zEVQ[y6BcM  
zsM2R"[X  
HCURSOR CCaptureDlg::OnQueryDragIcon() %8O1sF  
{ PfR|\{(  
 return (HCURSOR) m_hIcon; 2t7P| b~V1  
} g ?.y7!m  
]SC|%B_*  
void CCaptureDlg::OnCancel() R?t_tmKXC!  
{ /9pN.E  
 if(bTray) =fRC$  
  DeleteIcon(); ObPXVqG"?  
  CDialog::OnCancel(); &=^YN"=Z  
} 8KyRD1 (-R  
_jb' HP  
void CCaptureDlg::OnAbout() J5TT+FQ  
{ a`e'HQ  
 CAboutDlg dlg; Wu~cy}\  
 dlg.DoModal(); H@xHkqan  
} Q&#Arph0e  
dAWB.#  
void CCaptureDlg::OnBrowse() KS'n$  
{ ;FGS(.mjlC  
 CString str; c>Tf@A og>  
 BROWSEINFO bi; UY6aD~tD0  
 char name[MAX_PATH]; 2U|"]tpM&  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); f\;w(_  
 bi.hwndOwner=GetSafeHwnd(); Z=9<esx  
 bi.pszDisplayName=name; nR]*RIp5  
 bi.lpszTitle="Select folder"; v<@3&bot  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; F;bkV}^  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); GaCRo7  
 if(idl==NULL) $Ge0<6/  
  return; pwH*&YU  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); J!Q #xs  
 str.ReleaseBuffer(); 9a2[_Wy  
 m_Path=str; XJ!?>)N .  
 if(str.GetAt(str.GetLength()-1)!='\\') Oq^t[X'  
  m_Path+="\\"; Z9G4in8  
 UpdateData(FALSE); G|o O  
} G} f9:G  
enx+,[  
void CCaptureDlg::SaveBmp() tQ *?L  
{ 2`^6``  
 CDC dc; gR+P !Eow  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Mkh/+f4  
 CBitmap bm; [_eT{v2B4  
 int Width=GetSystemMetrics(SM_CXSCREEN); ppo.#p0w  
 int Height=GetSystemMetrics(SM_CYSCREEN); %+htA0aX  
 bm.CreateCompatibleBitmap(&dc,Width,Height); GorEHlvVh  
 CDC tdc; v#lrF\G5  
 tdc.CreateCompatibleDC(&dc); ZZw2m@T>  
 CBitmap*pOld=tdc.SelectObject(&bm); fH@cC`  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); IL`LI J:O  
 tdc.SelectObject(pOld); /lC,5y  
 BITMAP btm; v%r/PHw  
 bm.GetBitmap(&btm); O>N/6Z  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; {)iiu  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 3:O|p[2)L  
 BITMAPINFOHEADER bih;  aGOS 9  
 bih.biBitCount=btm.bmBitsPixel; PR/>E60H  
 bih.biClrImportant=0; R4X9g\KpAt  
 bih.biClrUsed=0; /d+v4GIB  
 bih.biCompression=0; |}2/:f#Iz*  
 bih.biHeight=btm.bmHeight; 2D(sA  
 bih.biPlanes=1; >/Gw)K}#E  
 bih.biSize=sizeof(BITMAPINFOHEADER); 7+8 8o:G9  
 bih.biSizeImage=size; {Q>4zepN!  
 bih.biWidth=btm.bmWidth; >k ==7#P  
 bih.biXPelsPerMeter=0; cTz@ga;!mI  
 bih.biYPelsPerMeter=0; Zor!hc0<  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); =), O;M  
 static int filecount=0; P*jiz@6  
 CString name; ,PoG=W  
 name.Format("pict%04d.bmp",filecount++); \K9.]PfbI  
 name=m_Path+name; $EHF f$M  
 BITMAPFILEHEADER bfh; 3ZC@q #R A  
 bfh.bfReserved1=bfh.bfReserved2=0; ZbiC=uh  
 bfh.bfType=((WORD)('M'<< 8)|'B'); q44vI  
 bfh.bfSize=54+size; ;HBKOe_3  
 bfh.bfOffBits=54; a x)J!I18  
 CFile bf; pTaC$Ne  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ y4! :l=E^  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); M,W-,l ]  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); xQ';$&  
  bf.WriteHuge(lpData,size); 5t-d+vB  
  bf.Close(); 6ddRFpe  
  nCount++; ^I|i9MH  
 } W[k rq_c-  
 GlobalFreePtr(lpData); Y4w]jIv  
 if(nCount==1) }Ml BmD  
  m_Number.Format("%d picture captured.",nCount); E=8GSl/Jx  
 else w2!:>8o:  
  m_Number.Format("%d pictures captured.",nCount); e$teh` p3  
  UpdateData(FALSE); DE7y\oO]  
} "N ">RjJ"  
U'msHF  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) T{2)d]Y  
{ !Pz#czo  
 if(pMsg -> message == WM_KEYDOWN) FGPqF;  
 { #6 ni~d&0  
  if(pMsg -> wParam == VK_ESCAPE) $IS!GS&:  
   return TRUE; C~ A`h=A<  
  if(pMsg -> wParam == VK_RETURN) ?hAO-*);  
   return TRUE; #'},/Lm@  
 } qO38vY){  
 return CDialog::PreTranslateMessage(pMsg); BQ<\[H;  
} VxS3lR=  
l]~9BPsR  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ; w+  
{ q6*i/"mN*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ $UdBZT-  
  SaveBmp(); %sPze]  
  return FALSE; wd32q7lGo1  
} ?w!8;xS8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <7>1Z 82)  
 CMenu pop; cHVJ7yAZI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); `k*;%}X\  
 CMenu*pMenu=pop.GetSubMenu(0); `#w#!@s#@  
 pMenu->SetDefaultItem(ID_EXITICON); 2@?X>,  
 CPoint pt; ES!e/l  
 GetCursorPos(&pt); GRJ6|T$!?$  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); VwRZgL  
 if(id==ID_EXITICON) E%;$vj'2  
  DeleteIcon(); !Y r9N4  
 else if(id==ID_EXIT) ,;5%&T  
  OnCancel(); 1_Ks*7vuq  
 return FALSE; PNd'21N  
} Aqmw#X  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); O9-`e  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) <wb6)U.  
 AddIcon(); -"S94<Y  
 return res; 0:71Xm  
} 0:n"A,-p  
"f<gZsb  
void CCaptureDlg::AddIcon() R2?s NlF  
{ )iiaT~ ]  
 NOTIFYICONDATA data; 5M~+F"Hl  
 data.cbSize=sizeof(NOTIFYICONDATA); ,?Ie!r$6  
 CString tip; l5=ih9u  
 tip.LoadString(IDS_ICONTIP); k0N>J8y  
 data.hIcon=GetIcon(0); po'b((q  
 data.hWnd=GetSafeHwnd(); ?%su?L  
 strcpy(data.szTip,tip); xo?'L&%  
 data.uCallbackMessage=IDM_SHELL; V=5S=7 Z:  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; /;w(sU  
 data.uID=98; %o4v} mzV  
 Shell_NotifyIcon(NIM_ADD,&data); uYWgNNxdmo  
 ShowWindow(SW_HIDE); }y+Qj6dP  
 bTray=TRUE; i$p2am8f  
} j1qU 4#Y  
&zB>  
void CCaptureDlg::DeleteIcon() ja~Dp5  
{ ! [1aP,  
 NOTIFYICONDATA data; R&6@*Nn  
 data.cbSize=sizeof(NOTIFYICONDATA); /O.Ql ,6[  
 data.hWnd=GetSafeHwnd(); rQlQ^W$=?  
 data.uID=98; +TA~RC d  
 Shell_NotifyIcon(NIM_DELETE,&data); rm ;U' &{  
 ShowWindow(SW_SHOW); N%>h>HJ  
 SetForegroundWindow(); t_xK?``  
 ShowWindow(SW_SHOWNORMAL); ~]RfOpq^w  
 bTray=FALSE; ?< ^8,H  
} *k_<|{>j(  
ZO/Jf Jn~  
void CCaptureDlg::OnChange() _ q1\8y  
{ "adic?5  
 RegisterHotkey(); /YUW)?o!^N  
} xM!9$v  
!4D?X\~"%  
BOOL CCaptureDlg::RegisterHotkey() _b/zBFa%  
{ Jnd_cJ]a  
 UpdateData(); 0SWqC@AR%  
 UCHAR mask=0; G/FDD{y  
 UCHAR key=0; uq-`1m }  
 if(m_bControl) jSHFY]2  
  mask|=4; 6;:D!},'c  
 if(m_bAlt) .%7Le|Fb"  
  mask|=2; g(X `.0  
 if(m_bShift) <QFayZ$  
  mask|=1; +>1?ck  
  key=Key_Table[m_Key.GetCurSel()]; t3?I4HQ  
 if(bRegistered){ #9r}Kr=P  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 2)}*'_E9  
  bRegistered=FALSE; zSD_t  
 } %{4 U\4d@'  
 cMask=mask; :<B_V<  
 cKey=key; EV Z1Z  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); `pCy:J?d>l  
 return bRegistered; LTzdg >\oJ  
} @v@F%JCZ  
_eq$C=3Ta  
  四、小结 #BcUE?K*N  
,D*bLXWh  
  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