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
  • 6332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: ;w6>"O$a  
  rC.eyq,105  
  一、实现方法 <V7>?U l  
[/ !;_b\X  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: UPc<gB  
6`0mta Q  
#pragma data_seg("shareddata") j4>a(  
HHOOK hHook =NULL; //钩子句柄 e$u4vC~  
UINT nHookCount =0; //挂接的程序数目 c&X{dJWD   
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 o\88t){/kB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  *[r!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey tG8jFou  
static int KeyCount =0; ~go fQ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 yfj K2  
#pragma data_seg() &K43x&mFF  
y.=/J8->  
  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。 )J_\tv  
26dUA~|KJ  
  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: S@}1t4Ls:  
\S*$UE]uG  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ,bM-I2BR  
cKey,UCHAR cMask) ly4s"4v  
{ P7 ]z  
 BOOL bAdded=FALSE; rwniOQe  
 for(int index=0;index<MAX_KEY;index++){ 2+cNo9f  
  if(hCallWnd[index]==0){ ik"sq}u_]E  
   hCallWnd[index]=hWnd; l" q1?kaVg  
   HotKey[index]=cKey; BnCKSg7V  
   HotKeyMask[index]=cMask; ed!:/+3e/  
   bAdded=TRUE; zF@o2<cD@  
   KeyCount++; <W`#gn0b6  
   break; E]J:~H'Er  
  } &n[~!%(  
 } osOVg0Gyj  
 return bAdded; =\,uy8HX  
} zP:cE  
//删除热键 FYb34LY  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C@Nv;;AlU  
{ +&X%<S W  
 BOOL bRemoved=FALSE; -w;(cE  
 for(int index=0;index<MAX_KEY;index++){ v}sY|p"  
  if(hCallWnd[index]==hWnd){ T/c<23i  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !Oj)B1gc6&  
    hCallWnd[index]=NULL; K. %U  
    HotKey[index]=0; '`|A I:L  
    HotKeyMask[index]=0; /w8"=6Vv~  
    bRemoved=TRUE; fQ'.8'>T  
    KeyCount--; 0l=+$& D  
    break; )-Ej5'iHr  
   } ?!=iu!J  
  } }C  /]  
 } x lsqj`=  
 return bRemoved; 4g}FB+[u  
} ZkP {[^6d\  
R*zO dxY  
!j1[$% =#  
  DLL中的钩子函数如下: tp:\j@dB  
uNHdpni  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) -ZW3  
{ .c^ ggy%  
 BOOL bProcessed=FALSE; l;"Ab?P\  
 if(HC_ACTION==nCode) *9 Q^5;y  
 { [EY`am8[  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 nRb^<cZf  
   switch(wParam) c=[q(|+O!  
   {  jJ3zF3Id  
    case VK_MENU: 0@5E|<A  
     MaskBits&=~ALTBIT; 6yu]GK} es  
     break; cBYfXI0`  
    case VK_CONTROL: Eq^uKi  
     MaskBits&=~CTRLBIT; v8/6wy?  
     break; TwvAj#j  
    case VK_SHIFT: a=xT(G0Re  
     MaskBits&=~SHIFTBIT; pilh@#_h  
     break; w?mEuXc  
    default: //judge the key and send message K'1~^)*  
     break; _Mc>W0'5@  
   } "BVdPSDBk  
   for(int index=0;index<MAX_KEY;index++){ xM s]Hs  
    if(hCallWnd[index]==NULL) h(B,d,q"  
     continue; TFR( 4W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9Bdt(}0A  
    { r]P,9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); $ P: O/O=>  
     bProcessed=TRUE; ukuo:P<a  
    } Jqr)V2Y  
   } bm}6{28R  
  } ~%ozgzr^  
  else if((lParam&0xc000ffff)==1){ //有键按下 U>S`k6  
   switch(wParam) %8)W0WMe  
   { Qn:kz*:  
    case VK_MENU: PzZZ>7_6S  
     MaskBits|=ALTBIT; XM|%^ry  
     break; i3mAfDF  
    case VK_CONTROL: 2UP,Tgn..  
     MaskBits|=CTRLBIT; 7S$&S;  
     break; PT9v*3Bq~  
    case VK_SHIFT: R4e&^tI@*  
     MaskBits|=SHIFTBIT; Zg:gY"^  
     break; !EF(*~r!9L  
    default: //judge the key and send message O'NW Ebl/  
     break; &hV Zx  
   } 68R1AqU_  
   for(int index=0;index<MAX_KEY;index++){ ~V)?>)T  
    if(hCallWnd[index]==NULL) IeF keE  
     continue; x`Fjf/1T*m  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Y7U&Q:5'  
    { 1;| LI?  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2GWDEgI1o  
     bProcessed=TRUE; BRbV7&  
    } ohc1 ~?3b  
   } XidxNPz0^  
  } {hqAnZ@]vr  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 F9XT lA  
   for(int index=0;index<MAX_KEY;index++){ !:fv>FEI9  
    if(hCallWnd[index]==NULL) NvtM3  
     continue; Wv K(G3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) {.k)2{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 7;LO2<|1  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 h<p3'  
   } v })Q  
  } hPdx(E)8!d  
 } 80ZnM%/}  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^m7~:=K7WG  
} 3+YbA)i;  
h ?#@~  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: jB@4b 'y  
dL;HV8z^  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); FN )d1q(~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (paf2F`~#  
3gfimD$_E  
  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: yu&Kh4AP  
8SnS~._9  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) .Gb+\E{M  
{ *j*Du+  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 45}v^|Je\  
 {  s&*yk p  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 BIWD/ |LQ  
  SaveBmp(); b;9n'UX\  
  return FALSE; :kw0y  
 } kI*UkM-  
 …… //其它处理及默认处理 eZF'Ck y  
} CJNG) p  
Q e1oT)  
#Ws 53mT  
  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。 6E9N(kFYs  
,EhVSrh)_4  
  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。 X<MpN5%|Wo  
l+ T, 2sd  
  二、编程步骤 9Z!lmfnJ  
WOndE=(V  
  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"; RfbdBsL  
v@T'7?s.  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ]b[,LwB\`~  
rm+v(&  
  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; (:$9%,x  
EI`vVI  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 3-Y=EH_0  
d><fu]'  
  5、 添加代码,编译运行程序。 V 4qtaHf  
IUhp;iH  
三、程序代码 R40W'N 1%q  
G8NRj9k?  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL zg]Drm  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) zW'/2W.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4DML  
#if _MSC_VER > 1000 z Bf;fi  
#pragma once ^eTZn[qH>w  
#endif // _MSC_VER > 1000 -qn[HXq  
#ifndef __AFXWIN_H__ ~%aJFs  
#error include 'stdafx.h' before including this file for PCH q]v,  
#endif ,OBQv.D3>a  
#include "resource.h" // main symbols t* z'c  
class CHookApp : public CWinApp 5upShtC  
{ 4%bTj,H#  
 public: I #l;~a<9z  
  CHookApp(); >_#)3K1y8  
  // Overrides g.*&BXZi  
  // ClassWizard generated virtual function overrides {a4xF2  
  //{{AFX_VIRTUAL(CHookApp) (Nt[v;BnO  
 public: D=w9cKa  
  virtual BOOL InitInstance(); 9H$g?';  
  virtual int ExitInstance(); A#:8X1w  
  //}}AFX_VIRTUAL 5fq.*1f  
  //{{AFX_MSG(CHookApp) cqg=8$RB  
  // NOTE - the ClassWizard will add and remove member functions here. {( HxG4~  
  // DO NOT EDIT what you see in these blocks of generated code ! 'jbMTI  
  //}}AFX_MSG RV]a%mVlM  
  DECLARE_MESSAGE_MAP() BD1K H;  
}; 7&t~R}&|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); &|,s{?z2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); %<S7  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -><QFJ  
BOOL InitHotkey(); ;qVG \wQq  
BOOL UnInit(); T5{T[YdX<  
#endif >40 GP#Vz  
Gmgeve  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ||gEs/6-  
#include "stdafx.h" IuKnM`X  
#include "hook.h" K50t%yu#T]  
#include <windowsx.h> -,@bA @&  
#ifdef _DEBUG =|# w.(3y  
#define new DEBUG_NEW -y<x!61  
#undef THIS_FILE le2/Zs$  
static char THIS_FILE[] = __FILE__; v|y<_Ya  
#endif qnTi_c  
#define MAX_KEY 100 `Of[{.Q  
#define CTRLBIT 0x04 @fDQ^ 4  
#define ALTBIT 0x02 x?>!UqgkY  
#define SHIFTBIT 0x01 P7Z<0Dt\}  
#pragma data_seg("shareddata") o~}1 oN  
HHOOK hHook =NULL; yr{5Rp05=  
UINT nHookCount =0; ?k w/S4  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey bQ=s8'  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 0Ts!(b]B  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey s9:%s*$u  
static int KeyCount =0; zK /f$}  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ^OjvL6 A/p  
#pragma data_seg() %d-`71|lG^  
HINSTANCE hins; <dJIq"){  
void VerifyWindow(); CMKhS,,o  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9M0d+:YJ  
//{{AFX_MSG_MAP(CHookApp) 7Ff?Ysr  
// NOTE - the ClassWizard will add and remove mapping macros here. Ahd\TH  
// DO NOT EDIT what you see in these blocks of generated code! x{QBMe`  
//}}AFX_MSG_MAP B^Bbso'{1  
END_MESSAGE_MAP() I-,Xwj-  
?V6 %>RU  
CHookApp::CHookApp() I<9n(rA  
{ ){jqfkL  
 // TODO: add construction code here, D;J|eC>^  
 // Place all significant initialization in InitInstance S].Ft/+H  
} !}j,TPpG  
WkcH5[  
CHookApp theApp; # s,Y% Bce  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 6BR \iZ  
{ u[: P  
 BOOL bProcessed=FALSE; t0I>5#*WU  
 if(HC_ACTION==nCode) lxCX-a`@p  
 { Bd.Z+#%l"  
  if((lParam&0xc0000000)==0xc0000000){// Key up D'85VZEFyo  
   switch(wParam) hQP6@KIe)  
   { o9~h%&  
    case VK_MENU: `6n!$Cxo  
     MaskBits&=~ALTBIT; qYDj*wqf  
     break; <XY;fhnB  
    case VK_CONTROL: Iy6p>z|  
     MaskBits&=~CTRLBIT; T&mbXMN  
     break; e%'z=%(  
    case VK_SHIFT: vx PDC~3;  
     MaskBits&=~SHIFTBIT; #?A]v>I;C  
     break; CF,8f$:2  
    default: //judge the key and send message /bu'6/!`  
     break; )Xq@v']%~9  
   } HgS<Vxmq  
   for(int index=0;index<MAX_KEY;index++){ 65;|cmjv  
    if(hCallWnd[index]==NULL) 4LJ]l:m  
     continue; zuU Q."#i  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b-,]A2.  
    { zZ<ns+h  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); D l4d'&!  
     bProcessed=TRUE; 0P3j+? N%  
    } wK2yt?  
   } <[/PyNYK  
  } 5#yJK>a7  
  else if((lParam&0xc000ffff)==1){ //Key down HDa~7wE  
   switch(wParam) xcAF  
   { V@ LN 1|  
    case VK_MENU: `WP@ZSC6  
     MaskBits|=ALTBIT; 0,;E.Py?.  
     break; d*]Dv,#X  
    case VK_CONTROL: d'x<- l9  
     MaskBits|=CTRLBIT; #>MO]  
     break; h85 (N  
    case VK_SHIFT: FLi(#9  
     MaskBits|=SHIFTBIT; M-}j9,oR`  
     break; 7W6eiUI'  
    default: //judge the key and send message 3"HGEUqA  
     break; D)f5pEq'  
   } MT;SRAmUr  
   for(int index=0;index<MAX_KEY;index++) %"1` NT  
   { bnA T,v{  
    if(hCallWnd[index]==NULL) YJ &lB&xH  
     continue; <Gbn PG?  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W?SP .-I  
    { HVtr,jg  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); iMP*]K-O  
     bProcessed=TRUE; |LXrGyk^  
    } T][-'0!  
   } bbE bf !E  
  } KyuA5jQ7  
  if(!bProcessed){ 4.,KEt'H  
   for(int index=0;index<MAX_KEY;index++){ <K=@-4/Bp  
    if(hCallWnd[index]==NULL) [K"U_b}w  
     continue; bd@*vu}?}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %s~NQ;Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); N1D6D$s0  
   } 8o*\W$K@  
  } xn%l  
 } Qx6,>'Qk'  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /}h71V!  
} >reaIBT  
d~togTs1  
BOOL InitHotkey() yYxeNE"  
{ c n\k`8  
 if(hHook!=NULL){ f_Wkg)g  
  nHookCount++; +YGw4{\EL  
  return TRUE; [ HC8-N^.}  
 } N/`TrWVF  
 else \;3B?8wbIl  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  ;'2`M  
  if(hHook!=NULL) n"^/UQ|#j  
   nHookCount++; CT$& zEIm  
  return (hHook!=NULL); wGov|[X  
} dv1x 78xG>  
BOOL UnInit() +cPE4(d  
{ \Owful  
 if(nHookCount>1){ >z fq*_  
  nHookCount--; s=\LewF1<  
  return TRUE; [H6X2yjj|  
 }  kg/+vJ  
 BOOL unhooked = UnhookWindowsHookEx(hHook); .IW_DM-  
 if(unhooked==TRUE){ BCj`WF@8l{  
  nHookCount=0; 1Pw(.8P  
  hHook=NULL; !s#'pTZk4  
 } s2(w#n)  
 return unhooked; pmow[e  
} (<d&BV-"  
 #{)r*"%  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !I~C\$^U  
{ 0Y38 T)k  
 BOOL bAdded=FALSE; cuV8#: i  
 for(int index=0;index<MAX_KEY;index++){ .-O@UQx.I  
  if(hCallWnd[index]==0){ 8%vh6$s6/  
   hCallWnd[index]=hWnd; i-:8TfI,  
   HotKey[index]=cKey; okK/i  
   HotKeyMask[index]=cMask; rm5T=fNJ  
   bAdded=TRUE; T!^?d5uW#  
   KeyCount++; RpmBP[  
   break; y(bt56 | z  
  }  Gh)sw72  
 } gW 6G+  
 return bAdded; 6oTbn{=UUq  
} %h/#^esi  
Q+u#?['  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) k *G!.  
{ /P?|4D}<  
 BOOL bRemoved=FALSE; oPBg+Bh*  
 for(int index=0;index<MAX_KEY;index++){ yKe*<\  
  if(hCallWnd[index]==hWnd){ &(H)gjH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ %ojR?=ON  
    hCallWnd[index]=NULL; -$L],q_S^  
    HotKey[index]=0; |%2/I>o  
    HotKeyMask[index]=0; =,>TpE  
    bRemoved=TRUE; 'Ec:l(2Ec  
    KeyCount--; @~!-a s7  
    break; 6`s%%v  
   } -A-hxK*^  
  } </+%R"`  
 } !%Hl#Pv}  
 return bRemoved; (A]m=  
} k+7M|t.?4  
;mo\ yW1  
void VerifyWindow() Wd^F%)(  
{ Bah.\ZsYQP  
 for(int i=0;i<MAX_KEY;i++){ ; $ ?jR c  
  if(hCallWnd!=NULL){ oM18aR&  
   if(!IsWindow(hCallWnd)){ #iR yjD  
    hCallWnd=NULL; @o3R`ZgC]\  
    HotKey=0; c:@OX[##  
    HotKeyMask=0; ]9KQP-p'  
    KeyCount--; cAKoPU>U  
   } /BjGAa(  
  } w.T=Lzp  
 } .j:.WnW  
} ^M"=A}h  
},Y; (n'  
BOOL CHookApp::InitInstance() (IWix){  
{ FVC2XxP  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <*r<+S   
 hins=AfxGetInstanceHandle(); }n2-*{)x  
 InitHotkey(); ;}>g1&q  
 return CWinApp::InitInstance(); QGbD=c7  
} {xBjEhQm  
 Z$#ZYD  
int CHookApp::ExitInstance() g+KzlS[6  
{ +2au ;^N  
 VerifyWindow(); Hh/ -^G  
 UnInit(); YPff)0Nh  
 return CWinApp::ExitInstance(); C tC`:!Q  
} ?`l=!>C4s  
4MtqQq4%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file c~L6fvS  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) )QSt7g|OF  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ( /x@W`  
#if _MSC_VER > 1000 Gs=a(0 0i?  
#pragma once xv#j 593  
#endif // _MSC_VER > 1000 <zDw& s2  
|B{$URu  
class CCaptureDlg : public CDialog ,5A>:2 zs  
{ P8,{k  
 // Construction 6JFDRsX>)?  
 public: N>}K+M>  
  BOOL bTray; {OhkuON  
  BOOL bRegistered; H-cBXp5z  
  BOOL RegisterHotkey(); R !%m5Q?5  
  UCHAR cKey; >NOYa3  
  UCHAR cMask; CN$A-sjZ  
  void DeleteIcon(); ^/d^$  
  void AddIcon(); ,^+R%7mv  
  UINT nCount; @Y&9S)xcE  
  void SaveBmp(); pv m'pu78  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor P15 *VPy  
  // Dialog Data 0h@%q;g  
  //{{AFX_DATA(CCaptureDlg) +}-W.H%`0  
  enum { IDD = IDD_CAPTURE_DIALOG }; $m: a-.I  
  CComboBox m_Key; u<y\iZ[   
  BOOL m_bControl; \]`(xxt1  
  BOOL m_bAlt; Tx!m6B`Y  
  BOOL m_bShift; +|"n4iZ!)  
  CString m_Path; DN 8pJa  
  CString m_Number; &!YH"{b  
  //}}AFX_DATA qnfRN'  
  // ClassWizard generated virtual function overrides )p^jsv.  
  //{{AFX_VIRTUAL(CCaptureDlg) 7SY->-H8  
 public: rLw[y$2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); dzv,)X  
 protected: ~"r wP=<}  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support  ISnS;  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); x&fCe{5  
  //}}AFX_VIRTUAL sBXk$  
  // Implementation ~Ro:mH: w  
 protected: UH^wyK bM  
  HICON m_hIcon; +#I~#CV!  
  // Generated message map functions TnU$L3k  
  //{{AFX_MSG(CCaptureDlg) O+o%C*`K  
  virtual BOOL OnInitDialog(); "g:&Ge*X  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); <K[Zl/7I  
  afx_msg void OnPaint(); 9MzkG87J  
  afx_msg HCURSOR OnQueryDragIcon(); POg0=32  
  virtual void OnCancel(); 5 EuJ  
  afx_msg void OnAbout(); 8Y0<lfG  
  afx_msg void OnBrowse(); IV)W|/.  
  afx_msg void OnChange(); 5Kw?SRFH/  
 //}}AFX_MSG OO wA{]gK  
 DECLARE_MESSAGE_MAP() 0^lL,rC   
}; WZ6{(`;#m  
#endif &'yV:g3H  
<[5${)  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file \HQb#f,  
#include "stdafx.h" *-!ndbf  
#include "Capture.h" H6JMN1#t$  
#include "CaptureDlg.h" W>|b98NPu  
#include <windowsx.h> 3Q~&xNf  
#pragma comment(lib,"hook.lib") P_lcX;O  
#ifdef _DEBUG >T*g'954xF  
#define new DEBUG_NEW n`KXJ?t  
#undef THIS_FILE |AfQ_iT6c  
static char THIS_FILE[] = __FILE__; \\G6c4 fC  
#endif ,M h/3DPgE  
#define IDM_SHELL WM_USER+1 O/^w! :z'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); dDn4nwH  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); PRlo"kN  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 8v=47G  
class CAboutDlg : public CDialog 4qz{ D"M  
{ iY'hkrw  
 public: geN%rD  
  CAboutDlg(); jp]geV54  
  // Dialog Data 3cFLU^  
  //{{AFX_DATA(CAboutDlg) %+! 9  
  enum { IDD = IDD_ABOUTBOX }; e&4wwP"`<  
  //}}AFX_DATA Qn3+bF4  
  // ClassWizard generated virtual function overrides ~kJpBt7M  
  //{{AFX_VIRTUAL(CAboutDlg) 3L]^x9Cu)  
 protected: )Q j9kJq  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q0; gF?  
  //}}AFX_VIRTUAL 4$2T zJE  
  // Implementation 99>yaW  
 protected: coVT+we  
  //{{AFX_MSG(CAboutDlg) M)pi)$&c  
  //}}AFX_MSG BBJ]>lQ  
  DECLARE_MESSAGE_MAP() :::f,aCAu  
}; +\oHQ=s>}\  
molowPI  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hJ*E"{xs  
{ gO%i5  
 //{{AFX_DATA_INIT(CAboutDlg) > ,Bu^] C  
 //}}AFX_DATA_INIT Xl+a@Ggtq  
} 5XUI7Q%  
=l'_*B8  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6ch[B`[h,  
{ QIV~)`;  
 CDialog::DoDataExchange(pDX); ~JPzjE  
 //{{AFX_DATA_MAP(CAboutDlg) {=4:Tgw  
 //}}AFX_DATA_MAP q8bS@\i  
} N,,2 VSUr  
<_q/ +x]8  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) S|4/C  
 //{{AFX_MSG_MAP(CAboutDlg) 9S1V! Jp  
 // No message handlers |M>k &p,B-  
 //}}AFX_MSG_MAP 4H? Ma|,  
END_MESSAGE_MAP() CPeK0(7Zh  
I3$vw7}5Y  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) WA\f`SRF  
: CDialog(CCaptureDlg::IDD, pParent) +i!M[  
{ B[|/wHMsT}  
 //{{AFX_DATA_INIT(CCaptureDlg) gj;G:;1m  
  m_bControl = FALSE; uWj-tzu  
  m_bAlt = FALSE; 76r s)J[*w  
  m_bShift = FALSE; F_ Cz  
  m_Path = _T("c:\\"); ~MQf($]  
  m_Number = _T("0 picture captured."); Q%1;{5   
  nCount=0; T2;  9  
  bRegistered=FALSE; q.F1Jj  
  bTray=FALSE; B "zg85 e  
 //}}AFX_DATA_INIT 3 v$4LY  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 #}yFHM?i  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J5IJy3d  
} u.Yb#?  
X*"O'XCA  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) bd*(]S9d  
{ O~OWRJ@p  
 CDialog::DoDataExchange(pDX); A3pQ?d[  
 //{{AFX_DATA_MAP(CCaptureDlg) @BhAFv,7  
  DDX_Control(pDX, IDC_KEY, m_Key); V=MZOj6  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); =I}V PxhE7  
  DDX_Check(pDX, IDC_ALT, m_bAlt); \^LR5S&  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {/!Gh\i  
  DDX_Text(pDX, IDC_PATH, m_Path); vkgL"([_  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Q^w]Nj(e_  
 //}}AFX_DATA_MAP pdiZ"pe  
} ve^MqW&S  
EC#10.  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *~^^A9C8  
//{{AFX_MSG_MAP(CCaptureDlg) =V 7w CW  
 ON_WM_SYSCOMMAND() kxwm08/|f  
 ON_WM_PAINT() 97dI4 t<  
 ON_WM_QUERYDRAGICON() YDD]n*&  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) ADz|Y~V!  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) +[[gU;U"v  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -- FtFo  
//}}AFX_MSG_MAP ,peE'   
END_MESSAGE_MAP() Bys|i0tb-  
p'}%pAY  
BOOL CCaptureDlg::OnInitDialog() e"/X*xA  
{ rep"xV&|>o  
 CDialog::OnInitDialog(); w!7/;VJ3d  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); dS=,. }  
 ASSERT(IDM_ABOUTBOX < 0xF000); L-$g& -  
 CMenu* pSysMenu = GetSystemMenu(FALSE); LXV6Ew5E  
 if (pSysMenu != NULL) =ApT#*D)o  
 { *60)Vo.=  
  CString strAboutMenu;  y-#tU>P  
  strAboutMenu.LoadString(IDS_ABOUTBOX); gNQJ:!  
  if (!strAboutMenu.IsEmpty()) rP4@K%F9jB  
  { 9ksrr{tW  
   pSysMenu->AppendMenu(MF_SEPARATOR); !:{_<C"D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ksp':2d}  
  } 0pOha(,~  
 } TaT&x_v^~a  
 SetIcon(m_hIcon, TRUE); // Set big icon nCB3d[/B  
 SetIcon(m_hIcon, FALSE); // Set small icon * ?fBmq[j  
 m_Key.SetCurSel(0); 1<|I[EI  
 RegisterHotkey(); P[i/o#  
 CMenu* pMenu=GetSystemMenu(FALSE); ix`xdVj`  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ^dD?riFAk  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); X5[sw;rk  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); T9?_ `h  
 return TRUE; // return TRUE unless you set the focus to a control 9 `&D  
} +JG"eh&J"H  
N *>; '  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) `<~P>  
{ q% 9oGYjvQ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /WVMT]T6^,  
 { t%@ pyK  
  CAboutDlg dlgAbout; ek!N eu>  
  dlgAbout.DoModal(); E5Jk+6EcMa  
 } 8:NHPHxB  
 else ?,C,q5 T\  
 { cn:VEF:l  
  CDialog::OnSysCommand(nID, lParam); 1j,Y  
 } p\\q[6  
} I5?LD=tt  
9~I WGj?  
void CCaptureDlg::OnPaint() ]:fHvx_?`7  
{ ApB0)N  
 if (IsIconic()) Cx~z^YP'  
 {  t m?  
  CPaintDC dc(this); // device context for painting B,T.bgp\  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `^vD4qD|  
  // Center icon in client rectangle :Ej)A fS  
  int cxIcon = GetSystemMetrics(SM_CXICON); EMbsKG  
  int cyIcon = GetSystemMetrics(SM_CYICON); C:{'0m*jKs  
  CRect rect; +i =78  
  GetClientRect(&rect); {o`5&EoM  
  int x = (rect.Width() - cxIcon + 1) / 2; 'QU ?O[CH  
  int y = (rect.Height() - cyIcon + 1) / 2; W9~datIh>  
  // Draw the icon 17d$gZ1O:  
  dc.DrawIcon(x, y, m_hIcon); o+&sodt|`  
 } etVE8N'  
 else e>.xXg6Zn  
 { 5H5Kt9DoW  
  CDialog::OnPaint(); [^f`D%8o  
 } r%i{a  
} ' M!_k+e  
Xy +|D#b  
HCURSOR CCaptureDlg::OnQueryDragIcon() B#yyO>0k]  
{ {r)M@@[  
 return (HCURSOR) m_hIcon; ,P+&-}gn9  
} m>_'f{&u  
i^l;PvIF  
void CCaptureDlg::OnCancel() Nfh(2g K+  
{ 0 CS_-  
 if(bTray) {5h_$a!TaU  
  DeleteIcon(); (%Rs&/vU~  
  CDialog::OnCancel(); ~fe0Ba4  
} !k63 `(Ti  
oL;/Qan  
void CCaptureDlg::OnAbout() /'&L M\  
{ sJWwkR  
 CAboutDlg dlg; WyETg!b[  
 dlg.DoModal(); |IvX7%*]~  
} @ 2_&ti  
w[&BY  
void CCaptureDlg::OnBrowse() -=w.tJD  
{ x&d<IU)5  
 CString str; Jo@9f(hq  
 BROWSEINFO bi; X(\RA.64  
 char name[MAX_PATH]; nDvWOt  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); u[DV{o  
 bi.hwndOwner=GetSafeHwnd(); j3>< J  
 bi.pszDisplayName=name; LmE-&  
 bi.lpszTitle="Select folder"; A5b}G  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8TZe=sD~cr  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); #z.x3D@^r6  
 if(idl==NULL) 5{> cfN\q  
  return; hGeRM4zVZZ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); |Th{*IJ <,  
 str.ReleaseBuffer(); gnGw7V  
 m_Path=str; ~08v]j q  
 if(str.GetAt(str.GetLength()-1)!='\\') W=*\4B]  
  m_Path+="\\"; ^BZdR<;  
 UpdateData(FALSE); sMx\WTyz  
} "`k[ 4C  
YS*t7  
void CCaptureDlg::SaveBmp() oS4ag  
{ >/*\x g&J  
 CDC dc; <#UvLll  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); M<nn+vy`  
 CBitmap bm; Z6p>R;9n  
 int Width=GetSystemMetrics(SM_CXSCREEN); I(.XK ucU  
 int Height=GetSystemMetrics(SM_CYSCREEN); sAb|]Q((  
 bm.CreateCompatibleBitmap(&dc,Width,Height); H;6V  
 CDC tdc; o>YR Kb  
 tdc.CreateCompatibleDC(&dc); 2-4%h!  
 CBitmap*pOld=tdc.SelectObject(&bm); y[cAU:P?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); >7 |37a  
 tdc.SelectObject(pOld); kL-+V)Kl  
 BITMAP btm; -Da_#_F  
 bm.GetBitmap(&btm); Sv ,_G'  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *sTQ9 Kr  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]:;gk&P  
 BITMAPINFOHEADER bih; ":Q^/;D}U  
 bih.biBitCount=btm.bmBitsPixel; <+a\'Xc  
 bih.biClrImportant=0; e/6oC~#]  
 bih.biClrUsed=0; 3-05y!vbcE  
 bih.biCompression=0; +vP1DXtj(  
 bih.biHeight=btm.bmHeight; X:A\{^ ~  
 bih.biPlanes=1; >nxtQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); d={}a,3?  
 bih.biSizeImage=size; V;!D:N8<  
 bih.biWidth=btm.bmWidth; G>Q{[m$  
 bih.biXPelsPerMeter=0; M@8(h=  
 bih.biYPelsPerMeter=0; }Y[.h=X  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6=   
 static int filecount=0; MI/1uw  
 CString name; ]mp.KvB  
 name.Format("pict%04d.bmp",filecount++); __QT lj  
 name=m_Path+name; y!#1A?|k  
 BITMAPFILEHEADER bfh; Umqm5*P(  
 bfh.bfReserved1=bfh.bfReserved2=0; [;(| ^0  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `{ /tx!  
 bfh.bfSize=54+size; y& )z\8  
 bfh.bfOffBits=54; ,O2F}5|;  
 CFile bf; ;23F8M%wH  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /mb| %U]~  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); *M="k 1P1  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); g%Z;rDfi  
  bf.WriteHuge(lpData,size); U5klVl  
  bf.Close(); #&2mu  
  nCount++; O/Fzw^  
 } vn8Ez6<27  
 GlobalFreePtr(lpData); qRUz;M4  
 if(nCount==1) yoH6g?!O  
  m_Number.Format("%d picture captured.",nCount); 4avM:h  
 else j_}e%,}  
  m_Number.Format("%d pictures captured.",nCount); dCHU* 7DS  
  UpdateData(FALSE); qAm%h\  
} 0zd1:*KR,  
i@2?5U>h  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) |y]#-T?)t  
{ .Ee8s]h5W  
 if(pMsg -> message == WM_KEYDOWN) MV/JZ;55  
 { .JzO f[g5  
  if(pMsg -> wParam == VK_ESCAPE)  np~oF  
   return TRUE; %spR7J\"/  
  if(pMsg -> wParam == VK_RETURN) /XXW4_>  
   return TRUE; th]9@7UE,  
 } D@2Tx  
 return CDialog::PreTranslateMessage(pMsg); xzy9~))o  
} kxKBI{L  
'K0Y@y  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 4U((dx*m  
{ ?.T=(-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?D.] c;PR  
  SaveBmp(); 3}H94H)]a  
  return FALSE; !u^(<.xJ   
} X \h]N  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ p5*i d5  
 CMenu pop; ?znSA >  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); AVi|JY)>  
 CMenu*pMenu=pop.GetSubMenu(0); cD{[rI E3  
 pMenu->SetDefaultItem(ID_EXITICON); r6^DD$X  
 CPoint pt; 0c]Lm?&  
 GetCursorPos(&pt); U $+rlw}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); l_8t[  
 if(id==ID_EXITICON) s?=J#WV1y  
  DeleteIcon(); ,3^N_>d$W  
 else if(id==ID_EXIT) Tj>~#~  
  OnCancel(); $N+azal+y  
 return FALSE; >%7iL#3%  
} W2n%D& PE  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Gm*i='f!?  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) sI~{it#  
 AddIcon(); HMBxj($eR  
 return res; r+) A)a,  
} 13B[m p4  
 iKDGYM  
void CCaptureDlg::AddIcon() d/;oNC+  
{ }ulFW]A^7  
 NOTIFYICONDATA data; A}$A~g5 Ap  
 data.cbSize=sizeof(NOTIFYICONDATA); 8Uc#>Ae'_  
 CString tip; 5H<rI?  
 tip.LoadString(IDS_ICONTIP); N^)L@6  
 data.hIcon=GetIcon(0); r|&qXb x  
 data.hWnd=GetSafeHwnd(); fx9c1h9s  
 strcpy(data.szTip,tip); {dA#r>z\1  
 data.uCallbackMessage=IDM_SHELL; 5:O"T  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; dLv\H&  
 data.uID=98; ecr pv+  
 Shell_NotifyIcon(NIM_ADD,&data); qgu.c`GmW  
 ShowWindow(SW_HIDE); .>&kA f.  
 bTray=TRUE; u{I)C0  
} B&tl6?7h  
$ZE OE8.\  
void CCaptureDlg::DeleteIcon() ]92@&J0w  
{ sR#( \  
 NOTIFYICONDATA data; 1(C%/g#"  
 data.cbSize=sizeof(NOTIFYICONDATA); 8TuOf(qE  
 data.hWnd=GetSafeHwnd(); y*P[* /g  
 data.uID=98; 7XdLZ4ub  
 Shell_NotifyIcon(NIM_DELETE,&data); hMi[MB7~  
 ShowWindow(SW_SHOW); xHI>CNC,  
 SetForegroundWindow(); D7 .R NXo  
 ShowWindow(SW_SHOWNORMAL); @v|_APy#  
 bTray=FALSE; YT#" HYO  
} [_${N,1  
r] 2}S=[  
void CCaptureDlg::OnChange() st pa2z  
{ W<kJ%42^j  
 RegisterHotkey(); Al 0zL  
} 3pm;?6i6  
" >;},$  
BOOL CCaptureDlg::RegisterHotkey() L7 qim.J  
{ AWGeK-^  
 UpdateData(); pi+m`O   
 UCHAR mask=0; (0^u  
 UCHAR key=0; :)bm+xWFF  
 if(m_bControl) is`le}$^y  
  mask|=4; 5y@JMQSO  
 if(m_bAlt) Uw4KdC  
  mask|=2; 3<?#*z4]_  
 if(m_bShift) I lvjS^j  
  mask|=1; <0pBu7a  
  key=Key_Table[m_Key.GetCurSel()]; O7:JG[tR*  
 if(bRegistered){ M" %w9)@  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); '@rGX+"  
  bRegistered=FALSE; v dyu=*Y  
 } *YYm;J'  
 cMask=mask; _v<EFal  
 cKey=key; +K]kGF  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); {R]4N]l>  
 return bRegistered; f5^[`b3H  
} H$WuT;cTE  
7 zK%CJ  
  四、小结 ~- JkuRJ\  
I%;xMt Y1o  
  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
批量上传需要先选择文件,再选择上传
认证码:
验证问题:
10+5=?,请输入中文答案:十五