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
  • 5349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: {1y-*@yU(  
  TB gD"i-  
  一、实现方法 rI5)w_E?  
n(gw%w+\7  
  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: z Lw=*  
x-5XOqD{'  
#pragma data_seg("shareddata") r2T-=XWB  
HHOOK hHook =NULL; //钩子句柄 %jK-}0Tu  
UINT nHookCount =0; //挂接的程序数目 s wdW70  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 tIgKnKr^)  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 J@y1L]:  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey lbv9 kk[  
static int KeyCount =0; {@u;F2?  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 J>P{8Aw  
#pragma data_seg() `um#}ify#  
aZYa<28?L%  
  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。 *sqq]uD  
Z4Nl{  6  
  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: &WIiw$@  
`?Yh`P0  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR T1p A <6  
cKey,UCHAR cMask) !aD/I%X  
{ N9D<wAK##)  
 BOOL bAdded=FALSE; Vc3tKuMsiX  
 for(int index=0;index<MAX_KEY;index++){ ;f7(d\=y  
  if(hCallWnd[index]==0){ M$z.S0"  
   hCallWnd[index]=hWnd; wj/\ !V!  
   HotKey[index]=cKey; 2;G^>BP<  
   HotKeyMask[index]=cMask; e g#.f`  
   bAdded=TRUE; s% "MaDz  
   KeyCount++; #N%xr'H  
   break; &inu mc  
  } DD\:glo  
 } " z\T$/  
 return bAdded; @X_x?N  
} EZz Ox(g  
//删除热键 iK6L\'k  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) T=}(S4n#BX  
{ .N8AkQ(Ok  
 BOOL bRemoved=FALSE; iIq='xwa9  
 for(int index=0;index<MAX_KEY;index++){ w} *;^n  
  if(hCallWnd[index]==hWnd){ LQ"56PP<  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <J@Y=#G$2  
    hCallWnd[index]=NULL; \~1M\gZP  
    HotKey[index]=0; A1:<-TF6^p  
    HotKeyMask[index]=0; Z9s tB>?  
    bRemoved=TRUE; h8oG5|Y  
    KeyCount--; 8*3<Erv  
    break; _niXl&C  
   } JS r& S[  
  } 0&Q-y&$7  
 } n'{cU(  
 return bRemoved; .oYUA}  
} NH$a:>  
u~\u8X3  
}3F8[Td.~N  
  DLL中的钩子函数如下: [k.|iCD  
9hEIf,\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Y"~I(,nx!  
{ tT87TmNsA  
 BOOL bProcessed=FALSE; quHq?oXV,  
 if(HC_ACTION==nCode) wQ qI@  
 { .v%H%z~Rl#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 V*rAZ0  
   switch(wParam) X>j% y7v  
   {  9S@PY_ms  
    case VK_MENU: 6wx;grt'Z  
     MaskBits&=~ALTBIT; .{x-A{l  
     break; NARW3\  
    case VK_CONTROL: R>U0W{1NO  
     MaskBits&=~CTRLBIT; Vu0jNKUV  
     break; PI(;t9]b  
    case VK_SHIFT: "5u*C#T2$  
     MaskBits&=~SHIFTBIT; %mPIr4$Pg  
     break; .}S9C]d:a  
    default: //judge the key and send message rvuskXdo  
     break; {^2``NYM_  
   } .ml24SeC  
   for(int index=0;index<MAX_KEY;index++){ nIJ2*QJ  
    if(hCallWnd[index]==NULL) .5'M^  
     continue; ya3A^&:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9 o6ig>C  
    { :@{(^}N8u  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); %719h>$  
     bProcessed=TRUE; `z%f@/:fG  
    } Hj't.lg+j  
   } K>X#,lE-  
  } 1@sy:{ d`  
  else if((lParam&0xc000ffff)==1){ //有键按下 4Ei*\:  
   switch(wParam) &2[OH}4  
   { UXwnE@`F  
    case VK_MENU: awh<CmcZ  
     MaskBits|=ALTBIT; E|Mu1I]e  
     break; /]m5HW(P7K  
    case VK_CONTROL: reJw&t}Q  
     MaskBits|=CTRLBIT; 8)HUo?/3  
     break; ,%7>%*nhk  
    case VK_SHIFT: ;+] mcgN!  
     MaskBits|=SHIFTBIT; 5H#f;L\k  
     break;  |`[0U  
    default: //judge the key and send message N|-M|1w96  
     break; 9$ZQuHSw 7  
   } _K["qm{X_  
   for(int index=0;index<MAX_KEY;index++){ jsB%RvX  
    if(hCallWnd[index]==NULL) r:0F("},  
     continue; UngDXD )  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) KGb:NQ=O6i  
    { Pj(Dl C7G,  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ieuq9ah#  
     bProcessed=TRUE; 0Cd )w4C  
    } -P#PyZEH&I  
   } J=?`~?Vbo  
  } bQd'objpY  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Nki08qZ[  
   for(int index=0;index<MAX_KEY;index++){ zA/ tHlKc  
    if(hCallWnd[index]==NULL) N?7MYP  
     continue;  %f3qCN  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?5'EP|<  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 8Ld{Xg  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 @p` *MWU  
   } j#4 Iu&YJ  
  } KA~eOEj M  
 } khFr%u ?S  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Q8-;w{%  
} 96G8B62  
,',  S  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: s4V-brCM$|  
})#VO-J  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 2IMU &  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 7\(m n$  
J>D+/[mFt  
  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: U)CGRh8%+  
P;~`%,+S  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ?XCFR t,ol  
{  ;IV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ZVu_E.4.  
 { >qE f991SZ  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 v@,n]"  
  SaveBmp(); Ygeg[S!7  
  return FALSE; T'i^yd }*v  
 } vbA<=V*P  
 …… //其它处理及默认处理 69q#Zw[,,  
} M[eq)a$  
h@kq>no  
%_P[ C}4  
  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。 zv%]j0 ?  
z6'Cz}%EP'  
  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<9' 3\  
p]jkfsCjN  
  二、编程步骤 |.#G G7F^S  
bm>N~DC  
  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"; nu(;yIRP  
yN@3uYBF  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; P^3`znq{  
% _.kd"  
  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; 7y?aw`Sw:  
^5'pJ/BV  
  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; ?8U#,qq#`  
&u`]Zn   
  5、 添加代码,编译运行程序。 ! V^wq]D2  
@1w[~QlV  
三、程序代码 ohJo1}{  
REg&[e+%  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL #"qP4S2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)  Y+d+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ H8x66}  
#if _MSC_VER > 1000 _|Uv7>}J^  
#pragma once <rihi:4K  
#endif // _MSC_VER > 1000 Q]{ `m  
#ifndef __AFXWIN_H__ ^7Rc\   
#error include 'stdafx.h' before including this file for PCH JT p+&NS  
#endif 9,?7mgZ p  
#include "resource.h" // main symbols V/&JArW  
class CHookApp : public CWinApp v]GQb  
{ nYnB WDnV  
 public: OWys`2W  
  CHookApp(); I}sb0 Q&  
  // Overrides OQ&'3hv{  
  // ClassWizard generated virtual function overrides ?CD[jX}!  
  //{{AFX_VIRTUAL(CHookApp) 8w$q4fg0  
 public: Fhrj$  
  virtual BOOL InitInstance(); .3'U(U  
  virtual int ExitInstance(); M <nH  
  //}}AFX_VIRTUAL t-i\gq^  
  //{{AFX_MSG(CHookApp) b OolBKV  
  // NOTE - the ClassWizard will add and remove member functions here. |{ @BH  
  // DO NOT EDIT what you see in these blocks of generated code ! ]7{ e~U  
  //}}AFX_MSG $DlO<  
  DECLARE_MESSAGE_MAP()  y 2C Jk~  
}; D0}r4eA  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); nN2huNTf:  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); P~*'/!@  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QuIZpP=  
BOOL InitHotkey(); $x*(D|\'<  
BOOL UnInit(); \ZtKaEXnx  
#endif I8/tD|3  
Mi} .  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. 9S|a!9J  
#include "stdafx.h" aH_0EBRc  
#include "hook.h" %i.Prckrb  
#include <windowsx.h> v,kvLjqt  
#ifdef _DEBUG R2A#2{+H  
#define new DEBUG_NEW \30rF]F`l  
#undef THIS_FILE d2?#&d'aq  
static char THIS_FILE[] = __FILE__; l<;~sag  
#endif qfX26<q  
#define MAX_KEY 100 P]O=K  
#define CTRLBIT 0x04 '5(T0Ws/w  
#define ALTBIT 0x02 :Y|[?;  
#define SHIFTBIT 0x01 _3IRj=Cs  
#pragma data_seg("shareddata") ,h9?o  
HHOOK hHook =NULL; =6 3tp 9  
UINT nHookCount =0; J$U_/b.mk  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey g2?yT ?  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT *c>B-Fo/D  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey V`8\)FFG  
static int KeyCount =0; Q ZC\%X8j  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Ciy%7_~\  
#pragma data_seg() * ,zrg%8  
HINSTANCE hins; G +&pq  
void VerifyWindow(); A&A{Thz  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) k=cDPu -  
//{{AFX_MSG_MAP(CHookApp) -Iis/Xw:  
// NOTE - the ClassWizard will add and remove mapping macros here. [FZq'E"87  
// DO NOT EDIT what you see in these blocks of generated code! lD{*Z spz  
//}}AFX_MSG_MAP v o4U%  
END_MESSAGE_MAP() TT no  
dUUg}/  
CHookApp::CHookApp() &;sW4jnt  
{ ROXa/  
 // TODO: add construction code here, kS?CKd9by  
 // Place all significant initialization in InitInstance eL<jA9cJ9  
} gZiwXb  
7?D?s!%\  
CHookApp theApp; cvQAo|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7xFZJ#  
{ =\ k:]  
 BOOL bProcessed=FALSE; =kf"%vFV  
 if(HC_ACTION==nCode) h?H|)a<^9  
 { pSI8"GwQ  
  if((lParam&0xc0000000)==0xc0000000){// Key up LJom+PxF$x  
   switch(wParam) ! >V)x  
   { Abi(1nXdQ  
    case VK_MENU: "LSzF_mK  
     MaskBits&=~ALTBIT; BOh^oQh  
     break; ef)zf+o  
    case VK_CONTROL: pTB7k3g  
     MaskBits&=~CTRLBIT; .lq83; k  
     break; K- $,:28  
    case VK_SHIFT: >t<\zC|~w  
     MaskBits&=~SHIFTBIT; X# /c7w-  
     break; hsT&c|  
    default: //judge the key and send message ksCF"o /@V  
     break; d S'J@e=#  
   } ky-nP8L}  
   for(int index=0;index<MAX_KEY;index++){ +jK-k_  
    if(hCallWnd[index]==NULL) P -nhG  
     continue; Dx`-h#  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) OScqf]H  
    { Yufj y=!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); aL`wz !  
     bProcessed=TRUE; `R>z{-@=  
    } 15q^&l[Q  
   } "*.N'J\  
  } pkae91  
  else if((lParam&0xc000ffff)==1){ //Key down M0~%[nX  
   switch(wParam) y4LUC;[n  
   { > <Zu+HX  
    case VK_MENU: tXH;4K@  
     MaskBits|=ALTBIT; |q 8N$m  
     break; {=?(v`88  
    case VK_CONTROL: 2%L`b"9}V  
     MaskBits|=CTRLBIT; >;' 0ymG.`  
     break; lgS7;  
    case VK_SHIFT: =*jFaj  
     MaskBits|=SHIFTBIT; |Tc4a4jS  
     break; y`j=(|DV  
    default: //judge the key and send message 1:<(Q2X%  
     break; 1}c'UEr%)  
   } U1X"UN)  
   for(int index=0;index<MAX_KEY;index++) &Cv  
   { k&%i+5X  
    if(hCallWnd[index]==NULL) c9fz x  
     continue; *d;TpwUI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) w5{l-Z  
    { >e R^G5rn;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Zfcf?&><  
     bProcessed=TRUE; N`,\1hHMT  
    } t@9-LYbL  
   } X,_K )f  
  } _1qR1< V  
  if(!bProcessed){ } O $]xB  
   for(int index=0;index<MAX_KEY;index++){ #` gu<xlW  
    if(hCallWnd[index]==NULL) g:a[N%[C  
     continue; GRbbU#/=G  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) S-88m/"]s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); `dG;SM$T,  
   } $zp|()_  
  } +cqUp6x.  
 } oJr+RO  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); XLCqB|8`V  
} R|M]mwa^w  
Y;_F,4H  
BOOL InitHotkey() <tF q^qB  
{ [)s4:V  
 if(hHook!=NULL){ )Bn }|6`  
  nHookCount++; T`fT[BaY  
  return TRUE; *>:phs~r{  
 } _7Y-gy#\a  
 else O5-GrR^yt  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); W1X3ArP]m8  
  if(hHook!=NULL) ,o%by5j"^N  
   nHookCount++; l3>e-kP  
  return (hHook!=NULL); )5~T%_  
} ~LpkA`Hn!  
BOOL UnInit() 5)T[ha77u  
{ lWj*tnnn[  
 if(nHookCount>1){ GkI'.  
  nHookCount--; 5H XF3  
  return TRUE; 8Lx/ZGy  
 } L7buY(F(  
 BOOL unhooked = UnhookWindowsHookEx(hHook); D1ZyJs#  
 if(unhooked==TRUE){ ~k"b"+2  
  nHookCount=0; M9R'ONYAa  
  hHook=NULL; y*+8Z&i.:  
 } ik o>G  
 return unhooked; {24>&<p  
} ^.8~}TT-U  
sk39[9  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) AJEbiP  
{ ]dNNw`1\V  
 BOOL bAdded=FALSE; R&.&x'<  
 for(int index=0;index<MAX_KEY;index++){ l,h`YIy  
  if(hCallWnd[index]==0){ W !j-/ql  
   hCallWnd[index]=hWnd; j H2)8~P  
   HotKey[index]=cKey; N,qo/At}R[  
   HotKeyMask[index]=cMask; FCNYfjB%  
   bAdded=TRUE; 2LUsqL\m}.  
   KeyCount++; WeRDaG  
   break; :a/rwZ[r  
  } L>IP!.J]?  
 } bdstxjJ`  
 return bAdded; ben-<3r  
} 9dA+#;?  
2fr%_GNu  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) + GQ{{B  
{ rd0Fd+t/  
 BOOL bRemoved=FALSE; -&7? !<f  
 for(int index=0;index<MAX_KEY;index++){ UAXp;W`  
  if(hCallWnd[index]==hWnd){ `{{6vb^g  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ UZs '[pm)  
    hCallWnd[index]=NULL; Jkj7ty.J  
    HotKey[index]=0; >xo<i8<Miv  
    HotKeyMask[index]=0; =nCA=-Jv  
    bRemoved=TRUE; (.!9  
    KeyCount--; H(.9tuA  
    break; udUc&pX  
   } |MGT8C&^!  
  } #1$4<o#M  
 } z{OL+-OY  
 return bRemoved; B(Yg1jAe  
} z8a{M$-Q  
.B~yI3D`M  
void VerifyWindow() B)@Xz<Q  
{ +I5\ `By=  
 for(int i=0;i<MAX_KEY;i++){ X8Z) W?vu  
  if(hCallWnd!=NULL){ ]'xci"qV`  
   if(!IsWindow(hCallWnd)){ el5Pe{j '  
    hCallWnd=NULL; ^V;r  
    HotKey=0; %!Eh9C*  
    HotKeyMask=0; d)uuA;n  
    KeyCount--; ZVH 9je  
   } )x\%*ewY  
  } >4wigc  
 } iWjNK"W  
} 'Iw`+=iVz  
A<c<!N  
BOOL CHookApp::InitInstance() i5le0lM  
{ 2H$](k?   
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ru`7iqcz  
 hins=AfxGetInstanceHandle(); DDmC3  
 InitHotkey(); X~VI}dJ  
 return CWinApp::InitInstance(); =:g\I6'a  
} =t_+ajY%  
`m(ZX\W]  
int CHookApp::ExitInstance() A94:(z;{  
{ Y_n/rD>  
 VerifyWindow(); m_Hg!Lg  
 UnInit(); :a&M]+!  
 return CWinApp::ExitInstance(); ]g$ky.;  
} 46T(1_Xt~  
y g(Na  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ynf "g#(  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_)  LkYcFD  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ aOg9Dqtg)f  
#if _MSC_VER > 1000 YvG$2F|_)  
#pragma once fIpS P@$<  
#endif // _MSC_VER > 1000 +arh/pd_I  
 j7_,V?5z  
class CCaptureDlg : public CDialog tBzE(vW  
{ [K #$W  
 // Construction XO?WxL9k]  
 public: L>/$l(  
  BOOL bTray; zZ-/S~l  
  BOOL bRegistered; r|}Pg}O  
  BOOL RegisterHotkey(); 7<70\ 6  
  UCHAR cKey; )2"g)9!  
  UCHAR cMask; ("=q-6$G  
  void DeleteIcon(); FDuA5At  
  void AddIcon(); gLt6u|0q  
  UINT nCount; hO> q|+mC  
  void SaveBmp(); ~ a 2A"#f  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ]v:,<=S  
  // Dialog Data TVvE0y(9  
  //{{AFX_DATA(CCaptureDlg) 'g<{l&u  
  enum { IDD = IDD_CAPTURE_DIALOG }; [r 7Hcb  
  CComboBox m_Key; _gK}Gi?|  
  BOOL m_bControl; ZJbaioc\  
  BOOL m_bAlt; -{*3<2rFK  
  BOOL m_bShift; ]+ub R;  
  CString m_Path; 1^NC=IS9z  
  CString m_Number; 6%t6u3  
  //}}AFX_DATA g,YF$:e  
  // ClassWizard generated virtual function overrides BPW.&2?<  
  //{{AFX_VIRTUAL(CCaptureDlg) V+sZ;$  
 public: nO6UlY  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2va[= >_  
 protected: p?Ux1S  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ]{i0?c  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =zAFsRoD_B  
  //}}AFX_VIRTUAL ?8grK  
  // Implementation ecl6>PS$'  
 protected: M1P;x._n  
  HICON m_hIcon; cyd_xB5K  
  // Generated message map functions A#q.)8  
  //{{AFX_MSG(CCaptureDlg) lu>G=uCJ  
  virtual BOOL OnInitDialog(); R+0fs$s u  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ^`xS| Sq1D  
  afx_msg void OnPaint(); ]D@aMC$#  
  afx_msg HCURSOR OnQueryDragIcon(); ' $yy  
  virtual void OnCancel(); r4FSQ$[9w  
  afx_msg void OnAbout(); vbd ;Je"  
  afx_msg void OnBrowse(); \0}bOHqEH  
  afx_msg void OnChange(); \s8h.xjU  
 //}}AFX_MSG C-49u<; ,  
 DECLARE_MESSAGE_MAP() gYh o$E  
}; 2PPb  
#endif C4X3;l Z%S  
+{6:]  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file  1l}Am>}  
#include "stdafx.h" DZESvIES  
#include "Capture.h" :k_)Bh?+  
#include "CaptureDlg.h" #Z]Cq0=  
#include <windowsx.h> h3>u[cX%  
#pragma comment(lib,"hook.lib") ?:GrM!kq76  
#ifdef _DEBUG :L:] 3L  
#define new DEBUG_NEW \A!I ln  
#undef THIS_FILE NmpNme  
static char THIS_FILE[] = __FILE__; WB (?6"  
#endif "<^ Vp-7r  
#define IDM_SHELL WM_USER+1 Y._ACQG3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Qe7 SH{  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); o^uh3,.  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ia9!ucN7DA  
class CAboutDlg : public CDialog ?o]NV  
{ PCDvEbpG  
 public: pIm ]WNX(  
  CAboutDlg(); 'Q7t5v@FF  
  // Dialog Data jfvlkE-uK  
  //{{AFX_DATA(CAboutDlg) #EKnjh=Uq  
  enum { IDD = IDD_ABOUTBOX }; e=jtF"&  
  //}}AFX_DATA qoph#\  
  // ClassWizard generated virtual function overrides fk2Uxg=[  
  //{{AFX_VIRTUAL(CAboutDlg) o2YHT \P n  
 protected: kot KKs   
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <#Fex'4  
  //}}AFX_VIRTUAL jtpk5 fJB  
  // Implementation ept:<!4  
 protected: S._h->5f  
  //{{AFX_MSG(CAboutDlg) uRuu!{$  
  //}}AFX_MSG i)'u!V  
  DECLARE_MESSAGE_MAP() dj,lbUL  
}; 3uvl'1(%J  
rP6k}  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) l~f9F`~'  
{ rw@N=`4P  
 //{{AFX_DATA_INIT(CAboutDlg) jt @2S  
 //}}AFX_DATA_INIT BlqfST#6  
} 2mx }bj8  
&&}c R:U,  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) Pqvj0zUo$  
{ EO",|V-  
 CDialog::DoDataExchange(pDX); O9N%dir  
 //{{AFX_DATA_MAP(CAboutDlg) S]&i<V1qX  
 //}}AFX_DATA_MAP f .h$jyp(  
} BNJG-b|g^  
:w4H$+j  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rhQO#_`  
 //{{AFX_MSG_MAP(CAboutDlg) gs@^u#O  
 // No message handlers z;0]T=g  
 //}}AFX_MSG_MAP [ifQLsHA  
END_MESSAGE_MAP() OWN|W,  
%z @T /  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) l29AC}^  
: CDialog(CCaptureDlg::IDD, pParent) ]?jmRk^ .  
{ Gv(n2r  
 //{{AFX_DATA_INIT(CCaptureDlg) M9yqJPS}B  
  m_bControl = FALSE; ov>`MCS,v  
  m_bAlt = FALSE; zlh\P`  
  m_bShift = FALSE; a  ?wg~|g  
  m_Path = _T("c:\\"); 9FT==>  
  m_Number = _T("0 picture captured."); 3fop.%(  
  nCount=0; b` 9Zin  
  bRegistered=FALSE; }u5J<*:bZ  
  bTray=FALSE; 7w0=i Z>K  
 //}}AFX_DATA_INIT ,.gI'YPQC  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 4x/u$Ixzh=  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); `Uk jr MO  
} &)~LGWBdC  
xA}{ZnTbN  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) n;dWb$:  
{ \>eFs} Y/  
 CDialog::DoDataExchange(pDX); D>wo>,G  
 //{{AFX_DATA_MAP(CCaptureDlg) .B$3y#TOb  
  DDX_Control(pDX, IDC_KEY, m_Key); Ujly\ix`  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); %N<>3c<8P  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Pb :6nH=  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); =gB{(  
  DDX_Text(pDX, IDC_PATH, m_Path); G~4|]^`g  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ht5:kt`F  
 //}}AFX_DATA_MAP 7nPm{=B G  
} wi:d!,P`e  
Rk{2ZUeg  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) #|e5i9l*B  
//{{AFX_MSG_MAP(CCaptureDlg) 1Imb"E  
 ON_WM_SYSCOMMAND() 0*u X2*  
 ON_WM_PAINT() <DdzDbgax  
 ON_WM_QUERYDRAGICON() 6tM@I`l  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) Xb*>7U/'T  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) T~N877  
 ON_BN_CLICKED(ID_CHANGE, OnChange) D <Fl7QAb  
//}}AFX_MSG_MAP o\y qf:V8  
END_MESSAGE_MAP() kZ 9n@($B  
SR\$fmo  
BOOL CCaptureDlg::OnInitDialog() Fg^zz*e  
{ [  **F  
 CDialog::OnInitDialog(); %{P." ki  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); vf_pEkx*wD  
 ASSERT(IDM_ABOUTBOX < 0xF000); @] {:juD~  
 CMenu* pSysMenu = GetSystemMenu(FALSE); tbi(e49S  
 if (pSysMenu != NULL) gem+$TFq  
 { n<sA?T  
  CString strAboutMenu; z;i4F.p  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ]h&?^L<.  
  if (!strAboutMenu.IsEmpty()) *WXqN!:  
  { %u$dN9cw  
   pSysMenu->AppendMenu(MF_SEPARATOR); nHF  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $Jj0%?;  
  } n %P,"V  
 } }(if|skau  
 SetIcon(m_hIcon, TRUE); // Set big icon E{|n\|  
 SetIcon(m_hIcon, FALSE); // Set small icon +Sdki::  
 m_Key.SetCurSel(0); $U5$*R@jo[  
 RegisterHotkey(); X1h*.reFAL  
 CMenu* pMenu=GetSystemMenu(FALSE); v{>9&o.J  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); $S!WW|9j.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); E@;v|Xc  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1^=[k  
 return TRUE; // return TRUE unless you set the focus to a control 4=n%<U`Z/  
} 27jZ~Bp$  
0 :1ldU 4  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 12%4>2}~>  
{ - e"XEot~  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 1HNX 6  
 { m-!z(vcn  
  CAboutDlg dlgAbout; ]r1 C  
  dlgAbout.DoModal(); k+&1?]   
 } vR\[IV?  
 else _b 8XF&O  
 { Hz<)a(r!J  
  CDialog::OnSysCommand(nID, lParam); _N`pwxpsb  
 } =E%<"FB  
} =R\-mov$  
EC| b7  
void CCaptureDlg::OnPaint() Z})n%l8J]p  
{ \\~4$Ai[  
 if (IsIconic()) t]%! vXo  
 { kOuQR$9s  
  CPaintDC dc(this); // device context for painting ^l/$ 13=  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); } u7&SU  
  // Center icon in client rectangle $JXQn  
  int cxIcon = GetSystemMetrics(SM_CXICON); mJ5LRpXN  
  int cyIcon = GetSystemMetrics(SM_CYICON); h?:Y\DlU'  
  CRect rect; pNzGpCk  
  GetClientRect(&rect); gb0ZGnI  
  int x = (rect.Width() - cxIcon + 1) / 2; OECXNx  
  int y = (rect.Height() - cyIcon + 1) / 2; X{riI^(  
  // Draw the icon <ByDT$E_  
  dc.DrawIcon(x, y, m_hIcon); IN9o$CZ:  
 } MRHkQE+K@8  
 else P1l@K2r  
 { #[#dc]D  
  CDialog::OnPaint(); KBFAV&  
 } DWH)<\?  
} Uyyw'Ni  
k||DcwO  
HCURSOR CCaptureDlg::OnQueryDragIcon() I2=Kq{  
{ R OQIw  
 return (HCURSOR) m_hIcon; =<[ZFO~v  
} &^YY>]1Py  
,/>~J]:\;  
void CCaptureDlg::OnCancel() b511qc"i>M  
{ 57b;{kl  
 if(bTray) {N,w5!cP  
  DeleteIcon(); uy;3s=03^  
  CDialog::OnCancel(); D r$N{d  
} 5OUe |mS  
{\e wf_pFk  
void CCaptureDlg::OnAbout() g)iSC?H  
{ !f\6=Z?>3  
 CAboutDlg dlg; @*O(dw  
 dlg.DoModal(); ~dwl7Qc  
} K`2a{`  
?Xo9,4V1  
void CCaptureDlg::OnBrowse() 0,;FiOp  
{ jr:LLn#}  
 CString str; k\}qCDs  
 BROWSEINFO bi; .9g\WH#qD|  
 char name[MAX_PATH]; c~|/,FZU'  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); hK$-R1O  
 bi.hwndOwner=GetSafeHwnd(); y6?Q5x9M  
 bi.pszDisplayName=name; |T"{q  
 bi.lpszTitle="Select folder"; tIC_/ 6  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; q& Vt*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Yazpfw 7'd  
 if(idl==NULL) 6C/D&+4  
  return; Z y7@"C  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); d*,|?Ar*b  
 str.ReleaseBuffer(); rd 1&?X  
 m_Path=str; ( |5g`JDG  
 if(str.GetAt(str.GetLength()-1)!='\\') q#Qr@Jf  
  m_Path+="\\"; GW{Nc !)  
 UpdateData(FALSE); TniZ!ud  
} XfsCu>  
X>|.BvY|  
void CCaptureDlg::SaveBmp() ]3QQ"HLcp  
{ _L!"3  
 CDC dc; D\V}Eo';6  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Krq^|DY  
 CBitmap bm; >8tE`2[i*  
 int Width=GetSystemMetrics(SM_CXSCREEN); &:jE+l  
 int Height=GetSystemMetrics(SM_CYSCREEN); ._tv$Gd@k  
 bm.CreateCompatibleBitmap(&dc,Width,Height); %NS]z;G  
 CDC tdc; +TAm9eDNV  
 tdc.CreateCompatibleDC(&dc); ?j0blXl  
 CBitmap*pOld=tdc.SelectObject(&bm);  (lPNMS|V  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 9 au)K!hN  
 tdc.SelectObject(pOld); s_Dl8O4u  
 BITMAP btm; p-; ]O~^  
 bm.GetBitmap(&btm); 65J'u N  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; x{ZVq 4  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); iQGoy@<R  
 BITMAPINFOHEADER bih; "3j0)  
 bih.biBitCount=btm.bmBitsPixel; G:e}>'  
 bih.biClrImportant=0; 3^su%z_%  
 bih.biClrUsed=0; f (n{7  
 bih.biCompression=0; d) o<R;F  
 bih.biHeight=btm.bmHeight; JrL/LGY  
 bih.biPlanes=1; Y*Q( v  
 bih.biSize=sizeof(BITMAPINFOHEADER); -I8%  
 bih.biSizeImage=size; PUYo >eB)0  
 bih.biWidth=btm.bmWidth; ln=zGX.e  
 bih.biXPelsPerMeter=0; nQ(#'9  
 bih.biYPelsPerMeter=0; oG*lU h}  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Iwn@%?7  
 static int filecount=0; MB |(,{S  
 CString name; Ol%*3To  
 name.Format("pict%04d.bmp",filecount++); *j*jA/  
 name=m_Path+name; FUcs=7c  
 BITMAPFILEHEADER bfh; v}Aw!Dv/  
 bfh.bfReserved1=bfh.bfReserved2=0; s_*eX N  
 bfh.bfType=((WORD)('M'<< 8)|'B'); &gEu%s^wR  
 bfh.bfSize=54+size; Vd1K{rH#  
 bfh.bfOffBits=54; y?unI~4tC  
 CFile bf; 7T2W% JT-,  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ "+ Qh,fTt  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); #/jHnRrQ   
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); x.r`(  
  bf.WriteHuge(lpData,size); 7R2)Klt  
  bf.Close(); 9vj:=,TNu  
  nCount++; R&alq  
 } 4*9Dh  
 GlobalFreePtr(lpData); F#<P FT4i  
 if(nCount==1) .$OInh  
  m_Number.Format("%d picture captured.",nCount); 1)PR]s:-m@  
 else ntkinbbD  
  m_Number.Format("%d pictures captured.",nCount); XWUT b\@  
  UpdateData(FALSE); fVN}7PH7+  
} < NAR'{f  
BA>0 +  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Q)}\4&4  
{ n[WeN NU  
 if(pMsg -> message == WM_KEYDOWN) 0F~9t !  
 { :<v$vER,&  
  if(pMsg -> wParam == VK_ESCAPE) q9!#S  
   return TRUE; D!sSe|sL^  
  if(pMsg -> wParam == VK_RETURN) 8|tm`r`*Az  
   return TRUE; JWn{nJ$]  
 } &4%J35~  
 return CDialog::PreTranslateMessage(pMsg); [qI*]  
} jh?7+(Cw  
Vlz T  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) `x#~ -  
{ GSFT(XX  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ t/D Q<B_  
  SaveBmp(); 1*jL2P]D  
  return FALSE; :hr@>Y~r  
} k2WO*xa*  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ~R8yj(  
 CMenu pop; @} Z/{Z[@  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); % b&BLXW  
 CMenu*pMenu=pop.GetSubMenu(0); /uc/x+(_  
 pMenu->SetDefaultItem(ID_EXITICON); W|Tew-H{h_  
 CPoint pt; %i "  
 GetCursorPos(&pt); *Fc&DQT(  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); ;' W5|.ZN  
 if(id==ID_EXITICON) H.mG0x`M"E  
  DeleteIcon(); ^U?(g0<"  
 else if(id==ID_EXIT) S p )}  
  OnCancel(); ri;M7rg`.{  
 return FALSE; 5q#|sVT7R  
} Y_B 4s-  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); Xda<TX@-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) >y~_Hh(TSL  
 AddIcon(); Iz8 ^? >X  
 return res; //,'oh~W  
} Cr%r<*s  
Pb;`'<*U  
void CCaptureDlg::AddIcon() cs M|VNE>  
{ o5@ jMU;  
 NOTIFYICONDATA data; 6V?RES;X  
 data.cbSize=sizeof(NOTIFYICONDATA); @(?4g-*E  
 CString tip; =4 H K  
 tip.LoadString(IDS_ICONTIP); QX=;,tr  
 data.hIcon=GetIcon(0); ]."c4S_)|  
 data.hWnd=GetSafeHwnd(); NXNon*"  
 strcpy(data.szTip,tip); UhTr<(@  
 data.uCallbackMessage=IDM_SHELL; zs:7!  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; .rm7Sd4K  
 data.uID=98; {wXN kq  
 Shell_NotifyIcon(NIM_ADD,&data); ')-(N um  
 ShowWindow(SW_HIDE); Hu7zmh5FF  
 bTray=TRUE; _q_[<{#  
} K-C,+eI  
piotd,  
void CCaptureDlg::DeleteIcon() L,pSdeq  
{ ;_a oM&  
 NOTIFYICONDATA data; y;Ln ao7i  
 data.cbSize=sizeof(NOTIFYICONDATA); UeMe4$m  
 data.hWnd=GetSafeHwnd(); C+?s~JL  
 data.uID=98; I=y j  
 Shell_NotifyIcon(NIM_DELETE,&data); 5 hadA>d  
 ShowWindow(SW_SHOW); 7B!Qq/E?g  
 SetForegroundWindow(); Q_.c~I}yV  
 ShowWindow(SW_SHOWNORMAL); $ ].k6,%{p  
 bTray=FALSE; MxEAs}MDv  
} J_E(^+  
>#U <#  
void CCaptureDlg::OnChange() /B\-DP3K  
{ 0P40K  
 RegisterHotkey(); b N e\{k  
} ,wi=!KzX  
@dCPa7:>&  
BOOL CCaptureDlg::RegisterHotkey() M6*{#Y?  
{  M .`  
 UpdateData(); a`~eC)T  
 UCHAR mask=0; nCMa$+  
 UCHAR key=0; [ky6E*dV`  
 if(m_bControl) 6Su@a%=j  
  mask|=4; ~)a ;59<$  
 if(m_bAlt) LZC?383'  
  mask|=2; q[OTaSQ~u^  
 if(m_bShift) ]z=Vc#+!  
  mask|=1; !GGGh0Bj  
  key=Key_Table[m_Key.GetCurSel()]; &:CjUaP@  
 if(bRegistered){ "SU-^z  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 53t- 'K0l  
  bRegistered=FALSE; ?5v5:U(A  
 } `$sY^EX  
 cMask=mask; +'qX sfc  
 cKey=key; W _,;eyo  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); "x|NG,<[9  
 return bRegistered; %L13Jsw  
} l \^nC2  
<VaMUm<2  
  四、小结 rt^45~  
{rvbo1t  
  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:
3+5=?,请输入中文答案:八 正确答案:八