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
  • 4886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: ;QS-a  
  yX/ 9jk  
  一、实现方法 gP? pfFhG  
a! ]'S4JS  
  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: ([^1gG+>J  
ZI}7#K<9X  
#pragma data_seg("shareddata") +A O(e  
HHOOK hHook =NULL; //钩子句柄 A-qdTJP  
UINT nHookCount =0; //挂接的程序数目 pm@Mlwg`1  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 zcy!YB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 FG:(H0  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey G-~+FnUC  
static int KeyCount =0; 8-+Ce;h  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ]haZT\  
#pragma data_seg() %?^IS&]Z  
}[\l$sS  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 Jzo|$W  
(~#{{Ja  
  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: t[Qf|#g  
B!4chxzUZ  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR ( hp 52Vse  
cKey,UCHAR cMask) UBLr|e>dQE  
{ lmf vT}$B  
 BOOL bAdded=FALSE; GU([A@;  
 for(int index=0;index<MAX_KEY;index++){ z;J"3kM  
  if(hCallWnd[index]==0){ }CIH1q3P  
   hCallWnd[index]=hWnd; JUHmIFjZ  
   HotKey[index]=cKey; `8/K+ e`  
   HotKeyMask[index]=cMask; //xK v{3fI  
   bAdded=TRUE; Y({&} \o  
   KeyCount++; xk7 MMRb  
   break; ;=fOyg  
  } ,( u- x!  
 } )[oegfnn-  
 return bAdded; N2#Wyt8MC  
} 5<^ $9('  
//删除热键 C8W#$a  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 2<q>]G-nN  
{ =^\yE"a  
 BOOL bRemoved=FALSE; 3"FvYv{  
 for(int index=0;index<MAX_KEY;index++){ }>]V_}h  
  if(hCallWnd[index]==hWnd){ P%2aOsD0  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 8iA[w-Pv  
    hCallWnd[index]=NULL; 6#hDj_(,  
    HotKey[index]=0; IOhJL'r  
    HotKeyMask[index]=0; UuPXo66F ]  
    bRemoved=TRUE; L 7VDZCV  
    KeyCount--; $KHw=<:)/  
    break; 7@oM?r7td  
   } >"5 f B  
  } W|'7)ph  
 } @G,pM: t  
 return bRemoved; GJS3O;2*  
} D~P3~^  
hg4d]R,  
tpPP5C{  
  DLL中的钩子函数如下: RUco3fZ   
zZp0g^;.?  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Di) %vU  
{ 4&N#d;ErC  
 BOOL bProcessed=FALSE; Pw+PBIGn4  
 if(HC_ACTION==nCode) JbX"K< nQ  
 { Mu: y9o95  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 }:+SA  
   switch(wParam) QP>tu1B|  
   {  *hWpJEV  
    case VK_MENU: 6Ft?9 B(F:  
     MaskBits&=~ALTBIT; 0gTv:1F /  
     break; Rxb?SBa  
    case VK_CONTROL: 3u[m? Vw  
     MaskBits&=~CTRLBIT; r ]s7a?O  
     break; 3EkCM_]  
    case VK_SHIFT: +{#65 z  
     MaskBits&=~SHIFTBIT; fJ<I|ZZ  
     break; Q3"{v0  
    default: //judge the key and send message zbY2gq@?  
     break; 7XzhKA6  
   } p+7G  
   for(int index=0;index<MAX_KEY;index++){ ;z2\ Q$  
    if(hCallWnd[index]==NULL) ?qC6p|H  
     continue; vbBNXy/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ahICx{hK  
    { ^#( B4l!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ty ESDp%  
     bProcessed=TRUE; u:]c  
    } C GN=kQ  
   } f |%II,!3  
  } $|"Y|3&X  
  else if((lParam&0xc000ffff)==1){ //有键按下 ZNDn! Sj  
   switch(wParam) +}VaQ8ti4  
   { OCW0$V6;D-  
    case VK_MENU: Ah 2*7@U  
     MaskBits|=ALTBIT; `^v=*&   
     break; |qs8( 5z0  
    case VK_CONTROL: *jR4OY|DXH  
     MaskBits|=CTRLBIT; [g<Y,0,J  
     break; I|n? 32F  
    case VK_SHIFT: =y^`yv 3  
     MaskBits|=SHIFTBIT; baQORU=X  
     break; /Fk]>|*  
    default: //judge the key and send message O:E0htdWr  
     break; ZWmS6?L.  
   } jlxY|;gZ-0  
   for(int index=0;index<MAX_KEY;index++){ YY zUg  
    if(hCallWnd[index]==NULL) XQ3"+M_KG  
     continue; ]J1oY]2~  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) yopC <k  
    { Y5{KtW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); I=[Ir8} ;  
     bProcessed=TRUE; 9| g]M:{  
    } 'GI| t  
   } m>{a<N  
  } -=cxUDB  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 TUBpRABH  
   for(int index=0;index<MAX_KEY;index++){ lfw|Q@  
    if(hCallWnd[index]==NULL) 0Ra%>e(I^  
     continue; CM%Rz-c  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ]4ib^R~Z  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5^ck$af  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 H@xHkqan  
   } *z'v  
  } R 7h^ @  
 } [I?[N.v  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); G! Y l0Zr  
} ,&~-Sq) ~  
Ij>G7Q*d  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: r.q*S4IS.m  
J`]9 n>G  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ^sKdN-{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); (_%l[:o6  
s\zY^(v4  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: 3,'LW}  
qRSoF04!R  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) N~uc%wOA  
{ #iKPp0`K*  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 7@&mGUALO  
 { g`z;:ao  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 E~@&&d U8  
  SaveBmp(); ' 7Mz]@  
  return FALSE; Ze!/b|`xI  
 } O _ C<h  
 …… //其它处理及默认处理 ,\?s=D{  
} 6gabnW3  
v2IcDz`}7  
CcTdLq  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 :7M%/#Fy  
l 88n*O  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 p()q)P  
H_ a##z  
  二、编程步骤 M"Af_Pbx  
u6 QW*8b4  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 4.Q[Tu  
<.#jp([W>  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; \gu8 ~zK  
2n+ud ?|l  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; w\mTug  
mGDy3R90  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 8.G<+.  
`$Um  
  5、 添加代码,编译运行程序。 q*Oj5;  
?S;z!) H)P  
三、程序代码 <:!E'WT#f  
7'OR ;b$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL g:O/~L0Xb  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) r$v \\^?2  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Wks zN h  
#if _MSC_VER > 1000 ]x).C[^  
#pragma once ce;$)Ff\  
#endif // _MSC_VER > 1000 [p' A?-  
#ifndef __AFXWIN_H__ oxBTm|j7  
#error include 'stdafx.h' before including this file for PCH VX*+:  
#endif T X iu/g(  
#include "resource.h" // main symbols ] g<$f#S  
class CHookApp : public CWinApp $EHF f$M  
{ ub!l Hl  
 public: "n{';Q)  
  CHookApp(); ZbiC=uh  
  // Overrides x ;~;Ah.p  
  // ClassWizard generated virtual function overrides ;HBKOe_3  
  //{{AFX_VIRTUAL(CHookApp) a x)J!I18  
 public: pTaC$Ne  
  virtual BOOL InitInstance(); y4! :l=E^  
  virtual int ExitInstance(); M,W-,l ]  
  //}}AFX_VIRTUAL xQ';$&  
  //{{AFX_MSG(CHookApp) ]#[4eaCg  
  // NOTE - the ClassWizard will add and remove member functions here. |)xWQ KzA  
  // DO NOT EDIT what you see in these blocks of generated code ! E2 FnC}#W  
  //}}AFX_MSG $vK,Gugcx  
  DECLARE_MESSAGE_MAP()  _X  
}; .Tm.M7  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); \03<dUA6  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }Ml BmD  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E=8GSl/Jx  
BOOL InitHotkey(); w2!:>8o:  
BOOL UnInit(); e$teh` p3  
#endif DE7y\oO]  
AOkG.u-k  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. TV0sxod6  
#include "stdafx.h" RX%)@e/@  
#include "hook.h" HY eCq9S  
#include <windowsx.h> U.V/JbXX  
#ifdef _DEBUG 3#x1(+c6  
#define new DEBUG_NEW m]*a;a'}#  
#undef THIS_FILE Niu |M@  
static char THIS_FILE[] = __FILE__; N p*T[J  
#endif vz#-uw,O:  
#define MAX_KEY 100 .%dGSDru  
#define CTRLBIT 0x04  Lagk   
#define ALTBIT 0x02 ,}khu  
#define SHIFTBIT 0x01  3Z`"k2k  
#pragma data_seg("shareddata") ]%I\FefT  
HHOOK hHook =NULL; #?+[|RS|  
UINT nHookCount =0; FZ}^)u}o  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey K2e68GU  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT ]'7Au]Us`  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ~ES%=if~Y  
static int KeyCount =0; 3=o4ncg(  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift E24SD'|)  
#pragma data_seg() IA&V?{OE@I  
HINSTANCE hins; b%*`}B  
void VerifyWindow(); wx`.  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 9D &vxKE  
//{{AFX_MSG_MAP(CHookApp) *5 9|  
// NOTE - the ClassWizard will add and remove mapping macros here. */JYP +  
// DO NOT EDIT what you see in these blocks of generated code! z.\r7  
//}}AFX_MSG_MAP ]b]J)dDI  
END_MESSAGE_MAP() glc<(V  
?{}P#sn  
CHookApp::CHookApp() =-~))!(  
{ {}8C/4iP  
 // TODO: add construction code here, 6]Q#4  
 // Place all significant initialization in InitInstance 94et ]u%7  
} YjnQ@IfIH  
[3qH? 2&  
CHookApp theApp; (]\p'%A)  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) TQKcPVlE  
{ wdf;LM  
 BOOL bProcessed=FALSE; 0>Td4qr+u  
 if(HC_ACTION==nCode) N P+ vi@Ud  
 { {$Uj&/IC  
  if((lParam&0xc0000000)==0xc0000000){// Key up F-b]>3r  
   switch(wParam) 'K02T:\iZ  
   { (3$DUvx7  
    case VK_MENU: ^fe,A=k~1  
     MaskBits&=~ALTBIT; _68vSYr  
     break; XkkzY5rxOc  
    case VK_CONTROL: !;mn]wR>a  
     MaskBits&=~CTRLBIT; iLJ@oM;2  
     break; z;P#  
    case VK_SHIFT: F!g1.49""  
     MaskBits&=~SHIFTBIT; rNJU & .]  
     break; o~e_M-  
    default: //judge the key and send message ]T|$nwQ  
     break; fMUh\u3  
   } #"~\/sb   
   for(int index=0;index<MAX_KEY;index++){ Wu<;QY($5  
    if(hCallWnd[index]==NULL) @k)J i!7  
     continue; P7zUf  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 6M`gy|"(~  
    { )eT>[['fm  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); hu} vYA7ZH  
     bProcessed=TRUE; :j .:t  
    } tY]?2u%)  
   } N>YSXh`W`y  
  } ?;htK_E\*  
  else if((lParam&0xc000ffff)==1){ //Key down J5F@<vi  
   switch(wParam) Dn J `]r  
   { l'_]0%o]  
    case VK_MENU: IDJ2epW*;  
     MaskBits|=ALTBIT; %*!6R:gAp  
     break; n"aF#HR?0d  
    case VK_CONTROL: gm,AH85  
     MaskBits|=CTRLBIT; i ]8bj5j{  
     break; Vt3*~Beb  
    case VK_SHIFT: ?wlRHVZ  
     MaskBits|=SHIFTBIT; yQ[;.<%v  
     break; 9XtO#!+48  
    default: //judge the key and send message -`{W~yz  
     break; h!JyFc  
   } _EP]|DTfr  
   for(int index=0;index<MAX_KEY;index++) ~Gmt,l! b  
   { 82ixv<B  
    if(hCallWnd[index]==NULL) o6;  
     continue; Z2yO /$<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Cw(ypu  
    { D@9 +yu=S  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); h%$^s0w  
     bProcessed=TRUE; 1goRO  
    } H[nBNz)C  
   } z9OpMA  
  } w' J`$=  
  if(!bProcessed){ &n_f.oUc  
   for(int index=0;index<MAX_KEY;index++){ p&V64L:V  
    if(hCallWnd[index]==NULL) m:`M&Xs&  
     continue; - EGZ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) %X.g+uu  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); {wA8!5Gu  
   } k7rg:P  
  } g.di3GGi  
 } _V1:'T8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); GRYw_}Aa  
} w{dRf!b69  
%Rf9 KQ  
BOOL InitHotkey() 60{DR >S  
{ cf$ hIB)Oi  
 if(hHook!=NULL){ csLbzDg  
  nHookCount++; 1Dc6v57  
  return TRUE; KMkD6g  
 } d9U)O6=  
 else kZF<~U  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); CUG"2K9  
  if(hHook!=NULL) L[9Kh&c  
   nHookCount++; L5zCL0j`  
  return (hHook!=NULL); 0AffD:  
} <F&XT@  
BOOL UnInit() o938!jML_  
{ \WTKw x  
 if(nHookCount>1){ 6@/k|t>OT  
  nHookCount--; (!5Pl`:j"  
  return TRUE; \/j,  
 } s+fxv(,"c  
 BOOL unhooked = UnhookWindowsHookEx(hHook); <yEApWd;  
 if(unhooked==TRUE){ 7<)  
  nHookCount=0; &xB9;v3  
  hHook=NULL; xrBM`Bj0@  
 } hGrX,.zj  
 return unhooked; R\&z3<-S  
} 6pS}\aD  
sCY  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 7bO>[RQB  
{ gI2'[OU  
 BOOL bAdded=FALSE; _<mY|  
 for(int index=0;index<MAX_KEY;index++){ ?t6wozib2  
  if(hCallWnd[index]==0){ {*hvzS{1d  
   hCallWnd[index]=hWnd; e~(e&4pb  
   HotKey[index]=cKey; !idVF!xG  
   HotKeyMask[index]=cMask; p.8  
   bAdded=TRUE; [kN_b<Pc,  
   KeyCount++; 8'zl\:@N  
   break; O/Hj-u6&A  
  } Ad-5Zn c5  
 } ulW>8bW&  
 return bAdded; H c>yZ:c;  
} @|t]9  
w0j'>4  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) b+ycEs=_  
{ L"dN $ A  
 BOOL bRemoved=FALSE; j} /).O  
 for(int index=0;index<MAX_KEY;index++){ `W+-0F@Y?@  
  if(hCallWnd[index]==hWnd){ bfncO[Q,?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ `S-l.zSZ4B  
    hCallWnd[index]=NULL; hg0{x/Dgny  
    HotKey[index]=0; x`C"Z7t  
    HotKeyMask[index]=0; _6h.<BR  
    bRemoved=TRUE; .xT{Rz  
    KeyCount--; P/[RH e  
    break; `@1e{ ?$  
   } KGc.YUoE  
  } qyVARy  
 } u1UCe  
 return bRemoved; (n>Gi;u(R  
} zGz}.-F  
wN%lc3[/z2  
void VerifyWindow() (G./P@/[  
{ 6S{F4v2/0  
 for(int i=0;i<MAX_KEY;i++){ Uvc$&j^k  
  if(hCallWnd!=NULL){ t}Td$K7  
   if(!IsWindow(hCallWnd)){ z?Z"*z  
    hCallWnd=NULL; d(^HO~p  
    HotKey=0; 6A.%)whI;  
    HotKeyMask=0; )i:*r8*~  
    KeyCount--; (X\]!'A  
   } <Rn-B).3bs  
  } V0 Z8VqV  
 } (j@c946z""  
} Z+6WG  
5HHf3E [  
BOOL CHookApp::InitInstance() (=WYi~2v  
{ F|m &n&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); YCb|eS^u  
 hins=AfxGetInstanceHandle(); z3L=K9)  
 InitHotkey(); =ca[*0^Z7  
 return CWinApp::InitInstance(); yO@1#  
} m6K7D([f  
2NjgLXP  
int CHookApp::ExitInstance() a]5y CBm  
{ hPz=Ec<zW  
 VerifyWindow(); XMZ$AeF@  
 UnInit(); VKYljY0#  
 return CWinApp::ExitInstance(); M"p%CbcI]  
} Pke8RLg2A  
Y-1K'VhT  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file q&9]4j  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) k%Tp9x$  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2TB'HNTFx  
#if _MSC_VER > 1000 |"%OI~^%  
#pragma once >iK LC  
#endif // _MSC_VER > 1000 (Ly^+Hjg  
mM?,e7Xhs  
class CCaptureDlg : public CDialog 3 i>NKS  
{ eE .wnn  
 // Construction <=6F=u3PtU  
 public: 1oiSmW\  
  BOOL bTray; M,ybj5:6  
  BOOL bRegistered; hPG@iX|V  
  BOOL RegisterHotkey(); )l m7ly8a|  
  UCHAR cKey; 45[,LJaMd  
  UCHAR cMask; <Dgf'Gr J  
  void DeleteIcon(); ?F$#t6Q  
  void AddIcon(); G;wh).jG5  
  UINT nCount; N Czabl  
  void SaveBmp(); @@\px66  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  HRbv%  
  // Dialog Data <<gW`KF   
  //{{AFX_DATA(CCaptureDlg) [hot,\+f  
  enum { IDD = IDD_CAPTURE_DIALOG }; "O$WfpKX  
  CComboBox m_Key; OIw[sum2  
  BOOL m_bControl; bw/mF5AsW  
  BOOL m_bAlt; qHyOaK Md  
  BOOL m_bShift; Yuf+d-%  
  CString m_Path; ~fL`aU&  
  CString m_Number; [hH>BEtm  
  //}}AFX_DATA $gYGnh_,Q  
  // ClassWizard generated virtual function overrides kxyOe[7 S  
  //{{AFX_VIRTUAL(CCaptureDlg) ARnq~E@1  
 public: ^jS1g*nrN  
  virtual BOOL PreTranslateMessage(MSG* pMsg); u^^jt(j  
 protected: `.pd %\  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nwfu@h0G  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 0(u}z  
  //}}AFX_VIRTUAL lsj9^z7  
  // Implementation !@ P{s'<:  
 protected: FxK!h.C.  
  HICON m_hIcon; 'ta&qp  
  // Generated message map functions bW/T}FN D  
  //{{AFX_MSG(CCaptureDlg) N:pP@o  
  virtual BOOL OnInitDialog(); RZq_}-P,.c  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); $K\e Pfk  
  afx_msg void OnPaint(); q2`mu4B  
  afx_msg HCURSOR OnQueryDragIcon(); Ny`SE\B+/  
  virtual void OnCancel(); 3@O/#CP+  
  afx_msg void OnAbout(); ~Hg*vCd ?  
  afx_msg void OnBrowse(); /5epDDP-t5  
  afx_msg void OnChange(); \Jc}Hzug  
 //}}AFX_MSG nI(w7qhub  
 DECLARE_MESSAGE_MAP() "^{Hta  
}; pO N#r  
#endif wfu`(4  
qSD`S1'2;  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ? ][/hL@[  
#include "stdafx.h" 8 ks\-38n1  
#include "Capture.h" !~7lY]_U  
#include "CaptureDlg.h" &"A:_5AU  
#include <windowsx.h> zd$iD i($  
#pragma comment(lib,"hook.lib") In:V.'D/>t  
#ifdef _DEBUG 0%HAa|L,,  
#define new DEBUG_NEW KC9VQeSc  
#undef THIS_FILE Wq1OYZ,  
static char THIS_FILE[] = __FILE__; ~@<o-|#  
#endif N^F5J  
#define IDM_SHELL WM_USER+1 m@D :t 5  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IvQuxs&a  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qyy .&+  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; {A ,w%  
class CAboutDlg : public CDialog -cn`D2RP  
{ {H9g&pfv  
 public: xi ,fm  
  CAboutDlg(); 5__B M5|  
  // Dialog Data V}2[chbl  
  //{{AFX_DATA(CAboutDlg) Lq6nmjL  
  enum { IDD = IDD_ABOUTBOX }; i~<.@&vt  
  //}}AFX_DATA bh\2&]Di/  
  // ClassWizard generated virtual function overrides ;Tq4!w'rH  
  //{{AFX_VIRTUAL(CAboutDlg)  =mcQe^M  
 protected: xa?auv!  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support %g>k0~TRf#  
  //}}AFX_VIRTUAL Sc}Rs  
  // Implementation x|^p9m"=%  
 protected: YReI|{O$c  
  //{{AFX_MSG(CAboutDlg) ?TW?2+  
  //}}AFX_MSG aDLlL?r3  
  DECLARE_MESSAGE_MAP() j2:9ahW  
}; ?wIEXKI  
s6;ZaU  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) U =g&c `  
{ 0d~?|Nv -  
 //{{AFX_DATA_INIT(CAboutDlg) /a-s9<  
 //}}AFX_DATA_INIT 3a U4Z|f~  
} !T~uxeZ/;  
md\Vw?PkU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) D=5%lL  
{ Gw6!cp|/  
 CDialog::DoDataExchange(pDX); _]3#C[1L  
 //{{AFX_DATA_MAP(CAboutDlg) nS.qK/.s  
 //}}AFX_DATA_MAP mmNn,>AO!  
} pA@R,O>zr  
rT4qx2u  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) g*4^HbVxt  
 //{{AFX_MSG_MAP(CAboutDlg) _IxYnm`pc  
 // No message handlers !@T~m1L eY  
 //}}AFX_MSG_MAP mpIR: Im  
END_MESSAGE_MAP() mv$gL  
{Ov{O,c 5  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) &f)pU>Di  
: CDialog(CCaptureDlg::IDD, pParent) L0%W;m  
{ W ,]Ua]  
 //{{AFX_DATA_INIT(CCaptureDlg) dd6l+z  
  m_bControl = FALSE; ka_R|x G\  
  m_bAlt = FALSE; Fs=E8' b  
  m_bShift = FALSE; H~ >\HV*  
  m_Path = _T("c:\\"); Tz\v.&? $  
  m_Number = _T("0 picture captured."); Q;m8 drU  
  nCount=0; ?c fFJl  
  bRegistered=FALSE; &RHx8zScP  
  bTray=FALSE; K\lu;   
 //}}AFX_DATA_INIT )U}`x }:,  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <]`|HJoy  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ,n>K$  
} ;__k*<+{.  
k&u5`F  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) +J42pSxzoo  
{ Ycxv=Et  
 CDialog::DoDataExchange(pDX); <fgf L9-  
 //{{AFX_DATA_MAP(CCaptureDlg) J/Ch /Sa  
  DDX_Control(pDX, IDC_KEY, m_Key); |NFDrm  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); W E /1h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); 1wggYX  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); cy2K#  
  DDX_Text(pDX, IDC_PATH, m_Path); uCWBM  
  DDX_Text(pDX, IDC_NUMBER, m_Number); [raj: 7yQ  
 //}}AFX_DATA_MAP S\k(0Sv9D  
} o7v9xm+  
;_=dB[M  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) zItGoJu  
//{{AFX_MSG_MAP(CCaptureDlg) %~lTQCPE  
 ON_WM_SYSCOMMAND() zmFKd5  
 ON_WM_PAINT() 3JF" O+@  
 ON_WM_QUERYDRAGICON() UH5A;SrTqR  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) O;(n[k  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ~Hb0)M@y7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) ZJjm r,1  
//}}AFX_MSG_MAP Vk1 c14i>  
END_MESSAGE_MAP() `@<)#9'A  
h4~VzCR4x\  
BOOL CCaptureDlg::OnInitDialog() wu} Zu  
{ %=vU Z4  
 CDialog::OnInitDialog(); iVM% ]\  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); )Tn(!.  
 ASSERT(IDM_ABOUTBOX < 0xF000); Y)AHM0;g  
 CMenu* pSysMenu = GetSystemMenu(FALSE); gm: xtN  
 if (pSysMenu != NULL) "Z-YZ>2  
 { axkNy}ct  
  CString strAboutMenu; -e+im(2D=  
  strAboutMenu.LoadString(IDS_ABOUTBOX); {]7lh#M  
  if (!strAboutMenu.IsEmpty()) P@Pe5H"o  
  { 'H1k  
   pSysMenu->AppendMenu(MF_SEPARATOR); `4qtmbj  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ;T>.  
  } `2G%&R,k"D  
 } kNrd=s,-]D  
 SetIcon(m_hIcon, TRUE); // Set big icon J p0j  
 SetIcon(m_hIcon, FALSE); // Set small icon Z?."cuTt  
 m_Key.SetCurSel(0); vH"^a/95|  
 RegisterHotkey(); jhka;m  
 CMenu* pMenu=GetSystemMenu(FALSE); FaG&U  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); srS5-fs  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); gJOD+~  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9*[!ux7h  
 return TRUE; // return TRUE unless you set the focus to a control yV) 9KGV+:  
} z) "(&__  
)u=a+T  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ,e*WJh8k[  
{ AIM<mU  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 'W p~8}i@  
 { mbIHzzW>  
  CAboutDlg dlgAbout; (+bt{Ma  
  dlgAbout.DoModal(); hx}X=7w  
 } , #(k|Zztc  
 else Tnnj8I1v  
 { ,Q+.kAh !G  
  CDialog::OnSysCommand(nID, lParam); s`dUie}y<  
 } l+^4y_  
} Qf@ha  
*Ud P1?Y  
void CCaptureDlg::OnPaint() p2wDk^$  
{ )JR&  
 if (IsIconic()) [5MV$)"!j  
 { [85tZr]  
  CPaintDC dc(this); // device context for painting Cuom_+wV&  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $69d9g8-(!  
  // Center icon in client rectangle p!`S]\XEB  
  int cxIcon = GetSystemMetrics(SM_CXICON); D+4$l+\u  
  int cyIcon = GetSystemMetrics(SM_CYICON); G,@ Jo[e  
  CRect rect;  :LTjV"f  
  GetClientRect(&rect); B5#>ieM*  
  int x = (rect.Width() - cxIcon + 1) / 2; Y\9zjewc  
  int y = (rect.Height() - cyIcon + 1) / 2; ?Pt*4NaT;  
  // Draw the icon (ZD~Q_O-  
  dc.DrawIcon(x, y, m_hIcon); ~Z ;.n p(T  
 } p3cb_  
 else ]P4?jKI  
 { 2-@z-XKn  
  CDialog::OnPaint(); 34aSRFsk*  
 } VVi3g  
} :i o[9B [  
Rs "#gT  
HCURSOR CCaptureDlg::OnQueryDragIcon() \{}5VVw-S?  
{ r]bG,?|  
 return (HCURSOR) m_hIcon; VO7&<Y}{x  
} "1-z'TV=  
Oa' T$'  
void CCaptureDlg::OnCancel() f2i9UZ$=e!  
{ eOUEhpE  
 if(bTray) PED5>90  
  DeleteIcon(); /9 |BAQ:v;  
  CDialog::OnCancel(); s[u*~A  
} U %aDkC+M  
RnUud\T/  
void CCaptureDlg::OnAbout() hJ*#t<.<P;  
{ >d^DN;p  
 CAboutDlg dlg; $gaGaB  
 dlg.DoModal();  e3%dNa  
} jlaC: (6  
0$. ;EGP  
void CCaptureDlg::OnBrowse() m=D9V-P  
{ NPt3#k^bW  
 CString str; 6=jL2cqx  
 BROWSEINFO bi; zkHyx[L  
 char name[MAX_PATH]; v2f|%i;tq  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); /k=k rAz.  
 bi.hwndOwner=GetSafeHwnd(); +}^^]J$Nh  
 bi.pszDisplayName=name; lN[#+n  
 bi.lpszTitle="Select folder"; +qM2&M  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; [LKzH!  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); gq&jNj7V  
 if(idl==NULL) }_9yemP  
  return; vH>s2\V"  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); '],G!U(  
 str.ReleaseBuffer(); ;b0;66C8|  
 m_Path=str; )bK3%>H#  
 if(str.GetAt(str.GetLength()-1)!='\\') E5t /-4  
  m_Path+="\\"; W-4R;!42  
 UpdateData(FALSE); 94u~:'t>V  
} xnC5WF7  
#8a k=lL  
void CCaptureDlg::SaveBmp() G,,f' >  
{ uB+ :sX-L  
 CDC dc; \-{2E  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); NnO%D^P]  
 CBitmap bm; ic?(`6N8  
 int Width=GetSystemMetrics(SM_CXSCREEN); m/ngPeZ  
 int Height=GetSystemMetrics(SM_CYSCREEN); [yDOv Q[  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 6:`4bo  
 CDC tdc; (Iv*sd *  
 tdc.CreateCompatibleDC(&dc); wo\O 0?d3{  
 CBitmap*pOld=tdc.SelectObject(&bm); Xrzpn&Y=#  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); F)=*Ga  
 tdc.SelectObject(pOld); w)"F=33}5  
 BITMAP btm; 9mB] \{^  
 bm.GetBitmap(&btm);  ~5n?=  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; (kSb74*g  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); Vu Ey`c  
 BITMAPINFOHEADER bih; 1cd3m  
 bih.biBitCount=btm.bmBitsPixel; FdS'0#$  
 bih.biClrImportant=0; jluv}*If  
 bih.biClrUsed=0; 5ih5=qX  
 bih.biCompression=0; $!\Z_ :  
 bih.biHeight=btm.bmHeight; B1z7r0Rm,  
 bih.biPlanes=1; (4FZK7Fm  
 bih.biSize=sizeof(BITMAPINFOHEADER); F[~~fm_  
 bih.biSizeImage=size; k3&/Ei5  
 bih.biWidth=btm.bmWidth; /=:F w}vt  
 bih.biXPelsPerMeter=0; "Q;Vy t  
 bih.biYPelsPerMeter=0; e@g=wN"@  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); !+n'0{  
 static int filecount=0; O]Q8&(  
 CString name; M~g@y$  
 name.Format("pict%04d.bmp",filecount++); {R7m qzt  
 name=m_Path+name; 921s'"  
 BITMAPFILEHEADER bfh; cC TTjx{  
 bfh.bfReserved1=bfh.bfReserved2=0; ` 6pz9j]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); X9ec*x  
 bfh.bfSize=54+size; 5YQJNP  
 bfh.bfOffBits=54; lYy:A%yDT  
 CFile bf; @[j%V ynf  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ C0H@  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); DN|+d{^lN  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); F-2Q3+7$  
  bf.WriteHuge(lpData,size); ;tfGhHpQn  
  bf.Close(); E{[>j'dwc  
  nCount++; r-&* `Jh  
 } L:Me  
 GlobalFreePtr(lpData); .Iv`B:4  
 if(nCount==1) )H%Rw V#  
  m_Number.Format("%d picture captured.",nCount); PH=O>a`a_O  
 else FF#?x@N:  
  m_Number.Format("%d pictures captured.",nCount); A1x    
  UpdateData(FALSE); [m9=e-KS$Q  
} uo7[T*<Q  
phy:G}F6%  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ?7w7Y;FuR  
{ g7Z3GUCGL  
 if(pMsg -> message == WM_KEYDOWN) ]O&yy{yYK  
 { ?nD]p!  
  if(pMsg -> wParam == VK_ESCAPE) [`bA,)y"  
   return TRUE; D1cnf"y^  
  if(pMsg -> wParam == VK_RETURN) a-9sc6@  
   return TRUE; 2.&%mSN  
 } gA&`vnNP  
 return CDialog::PreTranslateMessage(pMsg); oC(.u?  
} b`|,rfq^AZ  
/.:&9 c  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) -nnAe F  
{ ;et(Yi;9  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ |/!RN[<   
  SaveBmp(); b&.3uls6  
  return FALSE; 6jz~q~ I  
} )h/Qxf  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ .a}!!\@  
 CMenu pop; Fj1'z5$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); }dG>_/3  
 CMenu*pMenu=pop.GetSubMenu(0); zO3}c3D~q  
 pMenu->SetDefaultItem(ID_EXITICON); `B7?F$J  
 CPoint pt; {Ty?OZ  
 GetCursorPos(&pt); nLnzl  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); UsdUMt!u  
 if(id==ID_EXITICON) p i\SRDP  
  DeleteIcon(); ~0 Mw\p%}  
 else if(id==ID_EXIT) MMf_  
  OnCancel(); 5>~q4t)6z}  
 return FALSE; xd]7?L@h.I  
} H;RgYu2J  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); vPx#TXY=b}  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) {D4N=#tl  
 AddIcon(); <}1GYeP  
 return res; G/V0Yn""  
} 0Y/k /)Ul]  
gBo~NLrf  
void CCaptureDlg::AddIcon() =}[m_rp&  
{ }62Q{>`  
 NOTIFYICONDATA data; nLBi} T  
 data.cbSize=sizeof(NOTIFYICONDATA); \D}$foHg  
 CString tip; g (V_&Y  
 tip.LoadString(IDS_ICONTIP); 5!7vD|6  
 data.hIcon=GetIcon(0); }xytV5a^  
 data.hWnd=GetSafeHwnd(); "I JcKoB  
 strcpy(data.szTip,tip); ?) FY7[x.  
 data.uCallbackMessage=IDM_SHELL; LH>h]OTQF  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; !24g_R[3"  
 data.uID=98; WFMQ;  
 Shell_NotifyIcon(NIM_ADD,&data); A]m_&A#  
 ShowWindow(SW_HIDE); v#$}3+KVC  
 bTray=TRUE; &%@>S.  
} ' g Fewo  
?/24-n  
void CCaptureDlg::DeleteIcon() F1&7m )f$l  
{ DWu~%U8  
 NOTIFYICONDATA data; "nC=.5/$  
 data.cbSize=sizeof(NOTIFYICONDATA); /{nZ I_v#  
 data.hWnd=GetSafeHwnd(); r }Nq"s<  
 data.uID=98; wI2fCq(a0  
 Shell_NotifyIcon(NIM_DELETE,&data); 2Q[q)u  
 ShowWindow(SW_SHOW); `}*jjnr"  
 SetForegroundWindow(); vjYG>YhV  
 ShowWindow(SW_SHOWNORMAL); T%1Kh'92  
 bTray=FALSE; H^8t/h  
} |p":s3K"Hy  
]d,#PF  
void CCaptureDlg::OnChange() R!7a;J}  
{ d$v{oC }  
 RegisterHotkey(); 8:}$L)[V  
} 3vF-SgCV  
" {Nw K  
BOOL CCaptureDlg::RegisterHotkey() wm/>_  
{ f9J]-#Iif  
 UpdateData(); u %&4[zb  
 UCHAR mask=0; ~,reS:9RZ  
 UCHAR key=0; {aWfD XB1  
 if(m_bControl) ~Ec@hz]js  
  mask|=4; tq5o  
 if(m_bAlt) Ui;PmwQc&  
  mask|=2; ,\E5et4  
 if(m_bShift) WvHy}1W  
  mask|=1; IR<*OnKn  
  key=Key_Table[m_Key.GetCurSel()]; nF{>RD  
 if(bRegistered){ RUlJP  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); f`_6X~ p  
  bRegistered=FALSE; ]\oE}7K%r  
 } f{f|frs  
 cMask=mask; mS >I#?  
 cKey=key; PoRL35  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); M@O<b-  
 return bRegistered; T eBJ  
} S3_QOL  
Zj2tQ}N  
  四、小结 QNCG^ub  
_CXXgF[OCA  
  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