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
  • 6164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: Wh(V?!^@5  
  \4~uop,Nb+  
  一、实现方法 }OI;M^5L  
Jnb>u*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: #`); UAf  
7O;v5k~iQ  
#pragma data_seg("shareddata") u_e}m>[S  
HHOOK hHook =NULL; //钩子句柄 *<x EM-  
UINT nHookCount =0; //挂接的程序数目 /JtKn*?}:>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 \W( C=e  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 hn)mNb!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey a5?Rj~h!<  
static int KeyCount =0; Pf]6'?kQ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 3VB{Qj  
#pragma data_seg() $eX; 2  
4tCyd5u a8  
  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。 7>wSbAR<  
6Ei>VcN4a  
  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: $?(fiFC  
ss236&  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR x76<u:  
cKey,UCHAR cMask) '2/48j X5  
{ }7X85@jC  
 BOOL bAdded=FALSE; ]|Vm*zO  
 for(int index=0;index<MAX_KEY;index++){ t{Q9Kv  
  if(hCallWnd[index]==0){ #";(&|7  
   hCallWnd[index]=hWnd; FX+Ra@I!  
   HotKey[index]=cKey; HMS9_#[kE  
   HotKeyMask[index]=cMask; fE|([ ` !  
   bAdded=TRUE; M!,$i  
   KeyCount++; IM}#k$vM:  
   break; n_v|fxF1  
  } 9$)TAI&P  
 } :a0qm.EN  
 return bAdded; hCc_+/j|  
} CcLP/  
//删除热键 C*/d%eHD  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) n$ axqvG  
{ (JL{X`gs#  
 BOOL bRemoved=FALSE; ;5q=/  
 for(int index=0;index<MAX_KEY;index++){ 6S2D\Bt,_  
  if(hCallWnd[index]==hWnd){ * "~^k^_b}  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 31  QT  
    hCallWnd[index]=NULL; `Q, moz  
    HotKey[index]=0; Qi w "x,  
    HotKeyMask[index]=0;  *9`@  
    bRemoved=TRUE; iU~oPp[e  
    KeyCount--; Zc{at}{  
    break; O6YYOmt3  
   } [wjA8d.  
  } ORA +>  
 } 2J|Wbey  
 return bRemoved; _Sosw|A  
} }Rt?p8p  
=sG  C  
!n}"D:L(  
  DLL中的钩子函数如下: Qg%B<3 <  
R8W{[@  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Mf<P ms\F  
{ |jU/R  
 BOOL bProcessed=FALSE; egYJ.ZzF0  
 if(HC_ACTION==nCode) H8mmmt6g  
 { J3oH^  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 \.POb5]p0  
   switch(wParam) /U`"Xx  
   {  tOn/r@Fd^E  
    case VK_MENU: 4Bd[r7  
     MaskBits&=~ALTBIT; Oq|RMl  
     break; ("}TW-r~  
    case VK_CONTROL: ,&Gn7[<  
     MaskBits&=~CTRLBIT; }{n[_:[7  
     break; *=$Jv1"Q +  
    case VK_SHIFT: bsmZR(EnU  
     MaskBits&=~SHIFTBIT; bf VKf}  
     break; X) owj7U;  
    default: //judge the key and send message O< v0{z09*  
     break; l7ZqkGG]  
   } ]KA|};>ow  
   for(int index=0;index<MAX_KEY;index++){ ^$FHI_  
    if(hCallWnd[index]==NULL) AcwLs%'sx  
     continue; %{Kp#R5E  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) .Qyq*6T3&  
    { w +fsw@dK&  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 4@u*#Bp`|  
     bProcessed=TRUE; Ty}'A(U  
    } :3gtc/pt>  
   } 2>Xgo%  
  } %u, H2 *  
  else if((lParam&0xc000ffff)==1){ //有键按下 Ovq-rI{  
   switch(wParam) [O2xE037h`  
   { ,gVA^]eDh  
    case VK_MENU: 0B>hVaj>-  
     MaskBits|=ALTBIT; K63OjR >H  
     break; &u&/t?  
    case VK_CONTROL: @a'Rn  
     MaskBits|=CTRLBIT; %|*tL7  
     break; +g(>]!swb  
    case VK_SHIFT: [6`8^-}?  
     MaskBits|=SHIFTBIT; @>}!g9c  
     break; CCNrjaA  
    default: //judge the key and send message 3,8<5)ds*  
     break; ]]Sz|6P  
   } %?Yf!)owh  
   for(int index=0;index<MAX_KEY;index++){ ,,sKPj[  
    if(hCallWnd[index]==NULL) 6U Q~Fv`]  
     continue; 4QARrG%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M2W4 RovfR  
    { z\]]d?d?;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); _ho9}7 >  
     bProcessed=TRUE; :XC~G&HuF6  
    } 9. 6"C<eYt  
   } p[2`H$A  
  } F0qpJM,  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 g`i?]6c}jt  
   for(int index=0;index<MAX_KEY;index++){ ;.Zgt8/.  
    if(hCallWnd[index]==NULL) <wfPbzs-V  
     continue;  l+HmG< P  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) LUc!a4i"fO  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); CBN,~wzP*  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 h6Ovl  
   } Z@2^> eC  
  }  O{R)0&  
 } R.@I}>  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); wW EnAW~  
} "Rr)1x7  
w<#/ngI2  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: !w2J*E\  
#Z#rOh  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); C jISU$O  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); X [IVK~D}z  
.)59*'0  
  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: 6hp>w{+  
O_OgTa  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Q =9Ce@[  
{ fUx;_GX?  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ', ~  
 { U2<8U  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 bWWZGl9  
  SaveBmp(); fm]mqO  
  return FALSE; VUnO&zV{  
 } _^w&k{T  
 …… //其它处理及默认处理 Nk?eVJ)  
} sB`.G  
e}>3<Dh  
Vl'Gi44)3"  
  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 c,e&R  
Gf71udaa  
  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。 V1di#i:  
o-i9 :AHs  
  二、编程步骤 AK$&'t+$}7  
*ThP->&:(  
  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"; 41G}d+  
@=r YOQj |  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; NW_i<#  
8uAA6h+  
  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; =Ot|d #_  
=D;n#n7  
  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; Rtpk_ND!  
9U&~H*Hf  
  5、 添加代码,编译运行程序。 C- 5QhD  
4N6JKS  
三、程序代码 o-I:p$B-  
Q~k5 }n8  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL ES,T[  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) w3Lr~_j  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 8=!uQQ  
#if _MSC_VER > 1000 HpP82X xj  
#pragma once &?g!)O  
#endif // _MSC_VER > 1000 IC"Z.'Ph  
#ifndef __AFXWIN_H__ ^+p7\D/E(  
#error include 'stdafx.h' before including this file for PCH MHj RPh  
#endif 6mV-+CnYC  
#include "resource.h" // main symbols w1Txz4JqB  
class CHookApp : public CWinApp )iX2r{  
{ U}T{r%9  
 public: s!<RWy+  
  CHookApp(); z@I'Ryalyc  
  // Overrides C&|K7Zp0v  
  // ClassWizard generated virtual function overrides  jYUN:  
  //{{AFX_VIRTUAL(CHookApp) L:j3  
 public: ?7=c `  
  virtual BOOL InitInstance(); 4SVIdSA  
  virtual int ExitInstance(); [[$dPa9  
  //}}AFX_VIRTUAL =xw+cs1,x  
  //{{AFX_MSG(CHookApp) @*Tql:Qcd^  
  // NOTE - the ClassWizard will add and remove member functions here. ylm # Xa  
  // DO NOT EDIT what you see in these blocks of generated code ! 3 C{A  
  //}}AFX_MSG PI\C*_.  
  DECLARE_MESSAGE_MAP() gFpub_  
}; "?%2`*\  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); xO[V>Ud  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  T<oDLJA\  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); S-'R84M,F  
BOOL InitHotkey(); R_^0Un([  
BOOL UnInit(); +Jm~Um!  
#endif NC%96gfD  
+Tt.5>N  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zfrNM9C  
#include "stdafx.h" }1 ,\ *)5  
#include "hook.h" E/V_gci  
#include <windowsx.h> @AtJO>w  
#ifdef _DEBUG EDT9O  
#define new DEBUG_NEW D%}rQ,*  
#undef THIS_FILE t!-\:8n  
static char THIS_FILE[] = __FILE__; ?lE&o w  
#endif gLm,;'h%u  
#define MAX_KEY 100 fUMjLA|*I<  
#define CTRLBIT 0x04 iGPrWe@.  
#define ALTBIT 0x02 Jxf>!\:AZu  
#define SHIFTBIT 0x01 W_L*S4 ~  
#pragma data_seg("shareddata") 3n,jrX75u  
HHOOK hHook =NULL; FI,K 0sO/|  
UINT nHookCount =0; jB<B_"  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey P!Brw72  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT Q5c3C &$6  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey /!?b&N/d)  
static int KeyCount =0; !RP0W  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift \o*w#e[M  
#pragma data_seg() > ^=n|%  
HINSTANCE hins; ~R&rQJJeJ  
void VerifyWindow(); qj9[mBkP"  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) JC0#pU;  
//{{AFX_MSG_MAP(CHookApp) {]bmecz  
// NOTE - the ClassWizard will add and remove mapping macros here. S B~opN  
// DO NOT EDIT what you see in these blocks of generated code! -Uan.#~S  
//}}AFX_MSG_MAP  !2kM  
END_MESSAGE_MAP() Mw3$QRM  
fMIRr5  
CHookApp::CHookApp() k%3)J"|/  
{ + -uQ] ^n  
 // TODO: add construction code here, <6Y|vEo!N  
 // Place all significant initialization in InitInstance &gJ1*"$9  
} B(WmJ6e  
Wv|CJN;4  
CHookApp theApp; LC4VlfU  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) r?itd)WC<X  
{ o}DR p4;Ka  
 BOOL bProcessed=FALSE; ClY`2  
 if(HC_ACTION==nCode) uwQgu!|x  
 { qfG:v Tm  
  if((lParam&0xc0000000)==0xc0000000){// Key up Nw9@E R  
   switch(wParam) E[WU  
   { 7]} I  
    case VK_MENU: R?zlZS.~  
     MaskBits&=~ALTBIT; idB1%?<  
     break; oi m7=I0  
    case VK_CONTROL: wmww7  
     MaskBits&=~CTRLBIT; \q?^DI:`   
     break; 8 :WN@  
    case VK_SHIFT: w$IUm_~waa  
     MaskBits&=~SHIFTBIT; Fv7]1EO.  
     break; [n2zdiiBd  
    default: //judge the key and send message ^vxx]Hji  
     break; ,,H;2xYf  
   } ]0&X[?  
   for(int index=0;index<MAX_KEY;index++){ >fMzUTJ4  
    if(hCallWnd[index]==NULL) @ <3E `j'p  
     continue; &@,lF{KTL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZJF"Yo  
    { %%F, G  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Z^]jy>dj  
     bProcessed=TRUE; 'z^'+}iyv  
    } (kVY\!UAt  
   } ]isq}Qv~  
  } >|, <9z`D  
  else if((lParam&0xc000ffff)==1){ //Key down ~;jgl_5?b  
   switch(wParam) \s%g'g;  
   { rrR"2WuGO  
    case VK_MENU: <o9AjASv\,  
     MaskBits|=ALTBIT; $@@ii+W}\  
     break; :-O$rm  
    case VK_CONTROL: 'j*Q   
     MaskBits|=CTRLBIT; qH0JZdk  
     break; %X's/;(Lx`  
    case VK_SHIFT: sBYDo{0 1  
     MaskBits|=SHIFTBIT; JN:L%If  
     break; @D=B5f@(o  
    default: //judge the key and send message k>F!S`a&m  
     break; 2Y%7.YX"  
   } 5Q <vS"g  
   for(int index=0;index<MAX_KEY;index++) *= O]^|]2  
   { 9+MW13?  
    if(hCallWnd[index]==NULL) =dH=3iCG  
     continue; SHs [te[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) T*mR9 8i  
    { m_Pk$Vwx  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); VQ,5&-9Y3  
     bProcessed=TRUE; U# [T!E  
    } H\V?QDn  
   } ? A;RTM  
  }  ZB |s/  
  if(!bProcessed){ B8eZ}9X  
   for(int index=0;index<MAX_KEY;index++){ qE3Ud:j  
    if(hCallWnd[index]==NULL) ]zVQL_%,  
     continue; .?rs5[th*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) oQrfrA&=M  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]]_5_)"4  
   } Zn JJ-zP  
  } NC!B-3?x  
 } mhv6.W@  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); Qy"%%keV'T  
} EcX7wrl9x  
34X]b[^  
BOOL InitHotkey() jygUf|  
{ EZ{{p+e ^  
 if(hHook!=NULL){ 5Pq6X  
  nHookCount++; 9od c :  
  return TRUE; N<@K(? '  
 } `q\F C[W  
 else mi$C%~]5m  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); A4|7^Ay  
  if(hHook!=NULL) kP}l"CN4  
   nHookCount++; VRgckh m  
  return (hHook!=NULL); 0 LXu!iix  
} (SQGl!Lai0  
BOOL UnInit() *Gv:N6  
{ E.;Hm;  
 if(nHookCount>1){ n:B){'S  
  nHookCount--; A W6B[  
  return TRUE; g33Y$Xdk  
 } :R=7dH~r  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ]hy@5Jyh  
 if(unhooked==TRUE){ Du +_dr^4  
  nHookCount=0; Z2@e~&L  
  hHook=NULL; fd #QCs  
 } xjF>AAM_Px  
 return unhooked; ~:k r;n2  
} )7!,_r  
%QrOEs  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ^!C  
{ x^c,cV+*  
 BOOL bAdded=FALSE; #tpz74O  
 for(int index=0;index<MAX_KEY;index++){ c$)>$&([  
  if(hCallWnd[index]==0){ @aN~97 H\  
   hCallWnd[index]=hWnd; cAGM|%  
   HotKey[index]=cKey; ^`M%g2x  
   HotKeyMask[index]=cMask; 6HJsIeQ  
   bAdded=TRUE; ;nL7Hizo,  
   KeyCount++; L4T\mP7D7*  
   break; |A,.mOT  
  } Jw}&[  
 } fQ"Vx!  
 return bAdded; 0}`.Z03fy  
} [ _ `yy  
!-n* ]C  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) : O@(Sv  
{ 1c @S[y  
 BOOL bRemoved=FALSE; h4itXJy52B  
 for(int index=0;index<MAX_KEY;index++){ 5(\/ b<#  
  if(hCallWnd[index]==hWnd){ 'AWWdz  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ i;/;zG^=_  
    hCallWnd[index]=NULL; }eA ) m  
    HotKey[index]=0; =O"l/\c^  
    HotKeyMask[index]=0; Drf Au  
    bRemoved=TRUE; #@w/S:KbJt  
    KeyCount--; A'uaR?  
    break; /=l!F'  
   } l&e{GHz  
  } O(-6Zqk8Q  
 } ^8bc<c:P  
 return bRemoved; YahW%mv`d  
} T`j {2  
55TFBDc  
void VerifyWindow() pO fw *lD  
{ Het>G{  
 for(int i=0;i<MAX_KEY;i++){ Il>o60u1  
  if(hCallWnd!=NULL){ 0~_I9|FN  
   if(!IsWindow(hCallWnd)){ k:iy()n[  
    hCallWnd=NULL; ollVg/z  
    HotKey=0; !mWm@ }Ujg  
    HotKeyMask=0; ~iiDy;"  
    KeyCount--; i9rv8 "0>  
   } Gg GjBt  
  } -R1;(n)  
 } gaNe\  
} {|OXiRm'  
tI^[|@,  
BOOL CHookApp::InitInstance() pRxVsOb  
{ FIAmAZH}_  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); % jf|efxo  
 hins=AfxGetInstanceHandle(); 7rbw_m`12-  
 InitHotkey(); 'byTM?Sp{  
 return CWinApp::InitInstance(); (RrC<5"  
} o(> #}[N}  
Z  eY *5m  
int CHookApp::ExitInstance() 1#;^ Z3  
{ =_3rc\0  
 VerifyWindow(); @c"s6h&  
 UnInit(); c;(Fz^&_  
 return CWinApp::ExitInstance(); 5kWzD'!^  
} M&q~e@P  
DnhbMxh8o  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 90Sras>F  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) b{ A/M#=  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ -$#2?/uqC  
#if _MSC_VER > 1000 4bdCbI  
#pragma once D%?9[Qb  
#endif // _MSC_VER > 1000 ~#VDJ[Z  
P*}aeu&lnD  
class CCaptureDlg : public CDialog [g: cG  
{ y4 ]5z/  
 // Construction z<^LY]  
 public: }M"])B I  
  BOOL bTray; "Dq^r9  
  BOOL bRegistered; VM&Ref4  
  BOOL RegisterHotkey(); Y}q~ Km  
  UCHAR cKey; hMvJNI6O  
  UCHAR cMask; 9C Ki$L  
  void DeleteIcon(); ,JbP~2M~%  
  void AddIcon(); m :~y:.  
  UINT nCount; .X)Wb{7  
  void SaveBmp(); Ay^P #\VZ  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor MT)q?NcG  
  // Dialog Data I1s= =  
  //{{AFX_DATA(CCaptureDlg) Qi=0[  
  enum { IDD = IDD_CAPTURE_DIALOG }; PA*k |  
  CComboBox m_Key; |%#NA!e4wA  
  BOOL m_bControl; U7g,@/Qx  
  BOOL m_bAlt; q(R|3l^6T  
  BOOL m_bShift; w@6y.v1I{  
  CString m_Path; eTw9 c }[  
  CString m_Number; ieWXr4@:  
  //}}AFX_DATA XhWo~zh"  
  // ClassWizard generated virtual function overrides lk81IhI  
  //{{AFX_VIRTUAL(CCaptureDlg) \Nf#{  
 public: r58<A'#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); Y[>h |@  
 protected: -`z%<)!Y  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support >o`+j$j  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); UH+#Nel+!  
  //}}AFX_VIRTUAL qkp0'f*}  
  // Implementation $T66%wX  
 protected: o /1+ }f  
  HICON m_hIcon; =WZ9|e  
  // Generated message map functions j` * bz-  
  //{{AFX_MSG(CCaptureDlg) \UM&|yk:  
  virtual BOOL OnInitDialog(); 8:*ZuR|~  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (]&B' 1b  
  afx_msg void OnPaint(); 9H:J&'Xi7  
  afx_msg HCURSOR OnQueryDragIcon(); Zy?!;`c*{  
  virtual void OnCancel(); GNB'.tJ:0Y  
  afx_msg void OnAbout(); BNb_i H  
  afx_msg void OnBrowse(); |f1^&97=+  
  afx_msg void OnChange(); ZWjje6  
 //}}AFX_MSG s?k:X ~m  
 DECLARE_MESSAGE_MAP() SfrM|o  
}; h -091N  
#endif L*4= b (3  
pEN`6*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file t,0}}9%?  
#include "stdafx.h" \h0+` ;Q  
#include "Capture.h" M%Vp_ 0  
#include "CaptureDlg.h" OUO'w6m!  
#include <windowsx.h> + !nf?5;  
#pragma comment(lib,"hook.lib") N:#$S$  
#ifdef _DEBUG QGGBI Ku   
#define new DEBUG_NEW R3piI&u  
#undef THIS_FILE ;Oq>c=9%  
static char THIS_FILE[] = __FILE__; eOXu^M>:F  
#endif :=!6w  
#define IDM_SHELL WM_USER+1 q;f L@L@-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 'gD./|Z0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); QK#qW-49O  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I3sfOU  
class CAboutDlg : public CDialog +u5xK  
{ /n$R-Q  
 public: @;{ZnRv14  
  CAboutDlg(); x{So  
  // Dialog Data '0_W< lGB  
  //{{AFX_DATA(CAboutDlg) \'('HFr,  
  enum { IDD = IDD_ABOUTBOX }; ~d,$ nZ"z  
  //}}AFX_DATA `qCL&(`%  
  // ClassWizard generated virtual function overrides .A6pPRy e  
  //{{AFX_VIRTUAL(CAboutDlg) 9asA-'fZ  
 protected: (sH4 T>  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9U3}_  
  //}}AFX_VIRTUAL E(1G!uu<  
  // Implementation CQ Ei(ty  
 protected: 10r!p: D  
  //{{AFX_MSG(CAboutDlg) **AkpV)  
  //}}AFX_MSG yOXEP  
  DECLARE_MESSAGE_MAP() V,[[# a)y  
}; i*&b@.7N  
g_>E5z.  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ft0d5n!ui4  
{ !mwMSkkq  
 //{{AFX_DATA_INIT(CAboutDlg) b`DPlQHj  
 //}}AFX_DATA_INIT )u]=^  
} ]+w 27!  
jG}nOI  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) f8f3[O!x  
{ yw7bIcs|#b  
 CDialog::DoDataExchange(pDX); meThjCC  
 //{{AFX_DATA_MAP(CAboutDlg) Z R~2Y?Wt9  
 //}}AFX_DATA_MAP 1sJz`+\  
} [x`),3qD  
/%t`0pi  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) Wap\J7NY  
 //{{AFX_MSG_MAP(CAboutDlg) #\_FSr fX  
 // No message handlers K9nW"0>  
 //}}AFX_MSG_MAP !Zc#E,  
END_MESSAGE_MAP() B7[#z{8'#  
A%&lW9z7  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ~rXLb:  
: CDialog(CCaptureDlg::IDD, pParent) 0Am\02R.C,  
{ B_8JwMJu3  
 //{{AFX_DATA_INIT(CCaptureDlg) rF{,]U9`  
  m_bControl = FALSE; auY?Cj'"fs  
  m_bAlt = FALSE; ]1h9:PF  
  m_bShift = FALSE; |A0U 3$S=  
  m_Path = _T("c:\\"); ajkpU.6E:  
  m_Number = _T("0 picture captured."); d5{RIM|  
  nCount=0; DM\pi9<m  
  bRegistered=FALSE;  ggfCfn  
  bTray=FALSE; c3<H272\  
 //}}AFX_DATA_INIT <@4V G  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ).Iifu|ks  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); %Br1b6 V  
} {`> pigo  
/%{CJ0Y  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 0dD.xuor  
{ hX-^h2eV  
 CDialog::DoDataExchange(pDX); rCA0c8  
 //{{AFX_DATA_MAP(CCaptureDlg) ICG:4n(,  
  DDX_Control(pDX, IDC_KEY, m_Key); W~l.feW$i  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); *kj+6`:CPs  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ox";%|PP1  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); $0~1;@`rQ6  
  DDX_Text(pDX, IDC_PATH, m_Path); LJ z6)kz  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 1NrNTBI@  
 //}}AFX_DATA_MAP rV-Xsf7Z  
} /P/0\3TCi  
lX 50JJwk  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog)  7(o:J  
//{{AFX_MSG_MAP(CCaptureDlg) Gu2=+?i?h  
 ON_WM_SYSCOMMAND() ,Vz-w;oDn  
 ON_WM_PAINT() "N}MhcdS  
 ON_WM_QUERYDRAGICON() DwTVoCC  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 4JH^R^O<n  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) `bLJ wJ7  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 9 "M-nH*<  
//}}AFX_MSG_MAP -&%! 4(Je  
END_MESSAGE_MAP() +lf`Dd3  
wjOJn]  
BOOL CCaptureDlg::OnInitDialog() (&_~eYZU  
{ yVpru8+eD  
 CDialog::OnInitDialog(); |gT8QP  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); R"z}q (O:  
 ASSERT(IDM_ABOUTBOX < 0xF000); gS|6,A9  
 CMenu* pSysMenu = GetSystemMenu(FALSE); rTST_$"_6  
 if (pSysMenu != NULL) 01]W@ \(  
 { F"23v G>3  
  CString strAboutMenu; N~?#Qh|ZnU  
  strAboutMenu.LoadString(IDS_ABOUTBOX); jPc,+?  
  if (!strAboutMenu.IsEmpty()) }%y5<n*v\  
  { ScT{Tb]9bt  
   pSysMenu->AppendMenu(MF_SEPARATOR); lgb q^d  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); srKEtd"  
  } a:1$idj  
 } _vAc/_ N  
 SetIcon(m_hIcon, TRUE); // Set big icon F"' (i  
 SetIcon(m_hIcon, FALSE); // Set small icon T w1&<S  
 m_Key.SetCurSel(0); wRX#^;O9?>  
 RegisterHotkey(); 'Awd:Aed5  
 CMenu* pMenu=GetSystemMenu(FALSE); 4P7r\ hs  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); X&M04  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); LMp^]*)t  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 19Mu}.+;  
 return TRUE; // return TRUE unless you set the focus to a control . lSoC`HE  
} YYe=E,q  
-V'Y^Df  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) |#(y?! A^  
{ cCG!X%9  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) B,ao%3t  
 { D'UIxc8  
  CAboutDlg dlgAbout;  |vBy=:  
  dlgAbout.DoModal(); ~*tn|?%  
 } |2jA4C2L}  
 else nHLMF7\  
 { xd4~[n\hm  
  CDialog::OnSysCommand(nID, lParam); =W gzj|Kr  
 } 0R-W 9qP  
} 7H,)heA  
< 7*9b  
void CCaptureDlg::OnPaint() J)H*tzg  
{ TCkMJs?  
 if (IsIconic()) p$Floubh]  
 { +'[/eW  
  CPaintDC dc(this); // device context for painting F84<='K  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {?}^HW9{  
  // Center icon in client rectangle 5'|W(yR}  
  int cxIcon = GetSystemMetrics(SM_CXICON); ;[:IC^9fv  
  int cyIcon = GetSystemMetrics(SM_CYICON); .k,,PuP  
  CRect rect; "z*?#&?,  
  GetClientRect(&rect); B~YOU 3  
  int x = (rect.Width() - cxIcon + 1) / 2; /3;]e3x  
  int y = (rect.Height() - cyIcon + 1) / 2; !~xlze   
  // Draw the icon /.t1Ow  
  dc.DrawIcon(x, y, m_hIcon); kJCeQK:W  
 } {=MRJg!U  
 else TALiH'w6|e  
 { >h$Q%w{V  
  CDialog::OnPaint(); -6e^`c6{  
 } D]WrPWL8v  
} e0]%ko"  
8RcLs1n/  
HCURSOR CCaptureDlg::OnQueryDragIcon() J(9{P/  
{ g$JlpD&  
 return (HCURSOR) m_hIcon; dleCh+ny?  
} T^#d\2  
R I:kp.V  
void CCaptureDlg::OnCancel() }LoMS<O-[  
{ wVF qkJ  
 if(bTray) LMLrH.  
  DeleteIcon(); 1c*;Lr.K  
  CDialog::OnCancel(); u Vo"_c w  
} Q&w"!N  
l.BiE<&  
void CCaptureDlg::OnAbout() Ieh<|O,-C  
{ UsdMCJ&G  
 CAboutDlg dlg; cG1iO:  
 dlg.DoModal(); 8zho\'  
} mp*?GeV?M  
O;0VKNn['  
void CCaptureDlg::OnBrowse() `4ti?^BNm  
{ j-| !QlB  
 CString str; 5inCAPXz  
 BROWSEINFO bi; nXERj; Q"  
 char name[MAX_PATH]; 1'1>B  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #@E:|^$1y  
 bi.hwndOwner=GetSafeHwnd(); 00yWk_w  
 bi.pszDisplayName=name; ;"8BbF.  
 bi.lpszTitle="Select folder"; "1 UpoF'w  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; NIp]n[ =.q  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); (g1Op~EM  
 if(idl==NULL) b&RsxW7  
  return; 9!ARr@ ;  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); O.{  
 str.ReleaseBuffer(); 6lUC$B Y  
 m_Path=str; 7/)0{B4U'  
 if(str.GetAt(str.GetLength()-1)!='\\') =JxEM7r  
  m_Path+="\\"; Z=]ujlD  
 UpdateData(FALSE); ; FHnu|  
} X(Z(cY(  
Y3SV6""y/  
void CCaptureDlg::SaveBmp() 28 zZ3|Z3  
{ uI I! ?   
 CDC dc; Qm_;o(  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL);  } #&L  
 CBitmap bm; qI<c47d;q  
 int Width=GetSystemMetrics(SM_CXSCREEN); }[(v(1j='~  
 int Height=GetSystemMetrics(SM_CYSCREEN); _`,ZI{.J^  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8EBd`kiq  
 CDC tdc; {~XAg~  
 tdc.CreateCompatibleDC(&dc); gu&W:FY  
 CBitmap*pOld=tdc.SelectObject(&bm); |\94a  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); VH vL:z  
 tdc.SelectObject(pOld); [p]UM;+  
 BITMAP btm; Q`Rn,kCVy  
 bm.GetBitmap(&btm); "6v_<t`q"  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ? ?("0U  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D$E#:[  
 BITMAPINFOHEADER bih; }'Ph^ %ox  
 bih.biBitCount=btm.bmBitsPixel; \C{Zqo,  
 bih.biClrImportant=0; f+\UVq?  
 bih.biClrUsed=0; vI:_bkii  
 bih.biCompression=0; N0N%~3  
 bih.biHeight=btm.bmHeight; !/X>k{  
 bih.biPlanes=1; \S{ihS@J  
 bih.biSize=sizeof(BITMAPINFOHEADER); {Z178sik  
 bih.biSizeImage=size; d<E2=WVB6  
 bih.biWidth=btm.bmWidth; U~dqxR"Q  
 bih.biXPelsPerMeter=0; WC b 5  
 bih.biYPelsPerMeter=0; ?yu@eo  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <&bBE"U4  
 static int filecount=0; (0rcLNk{|  
 CString name; 8G3.bi'q   
 name.Format("pict%04d.bmp",filecount++); QSwT1P'U  
 name=m_Path+name; ;vn0b"Fi3  
 BITMAPFILEHEADER bfh; $x#qv1  
 bfh.bfReserved1=bfh.bfReserved2=0; EYi{~  
 bfh.bfType=((WORD)('M'<< 8)|'B'); </R@)_'  
 bfh.bfSize=54+size; A$L:,b(  
 bfh.bfOffBits=54; bfkFk  
 CFile bf; x'SIHV4M@Q  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ c5pK%I}O  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5'%O]~  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); J/PK #<  
  bf.WriteHuge(lpData,size);  '{cFr  
  bf.Close(); 6rO^ p  
  nCount++; `G=+qti  
 } LLoV]~dvUu  
 GlobalFreePtr(lpData); LLMGs: [  
 if(nCount==1) 'R99m?"  
  m_Number.Format("%d picture captured.",nCount); %/ :&L+q  
 else Ds{bYK_y  
  m_Number.Format("%d pictures captured.",nCount); ,wy;7T>ODd  
  UpdateData(FALSE); Y@qugQM>  
} ^N`KT   
yN06` =  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w7\vrS>&  
{ e)3Mg^  
 if(pMsg -> message == WM_KEYDOWN) GoPMWbI7  
 { @gQ?cU7  
  if(pMsg -> wParam == VK_ESCAPE) \gv-2.,  
   return TRUE; )Lk2tvr  
  if(pMsg -> wParam == VK_RETURN) Bx.hFEL  
   return TRUE; dKL9}:oUa  
 } z80*Ylx  
 return CDialog::PreTranslateMessage(pMsg); `>RM:!m6=$  
} Kek %io  
U.ZA%De  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) JV+Uy$P!  
{ JIc9csr:b  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ @ ]42.oP  
  SaveBmp(); 8: uh0  
  return FALSE; )QmmI[,tq  
} gV*4{ d`  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ -w'g0/fD  
 CMenu pop; ::3[H$  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 4#I=n~8a  
 CMenu*pMenu=pop.GetSubMenu(0); {}=5uU2Tu  
 pMenu->SetDefaultItem(ID_EXITICON); ^9YS dFH/  
 CPoint pt; ^PMA"!n8  
 GetCursorPos(&pt); 8v)HTD/C  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Zjs,R{  
 if(id==ID_EXITICON) QD1&"T<.d.  
  DeleteIcon(); IWwOP{ <ZQ  
 else if(id==ID_EXIT) t{B6W)q  
  OnCancel(); {7v|\6@e3  
 return FALSE; zB\ 8<97 C  
} W>'gG}.  
LRESULT res= CDialog::WindowProc(message, wParam, lParam);  }"q#"s  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) QX_![|=  
 AddIcon(); A.YK=_J  
 return res; W&m3"~BJ  
} kHQn' r6  
WMFn#.aY5  
void CCaptureDlg::AddIcon() ;#*.@Or@Ah  
{ h645;sb0  
 NOTIFYICONDATA data; L$jii  
 data.cbSize=sizeof(NOTIFYICONDATA); `];ne]xM  
 CString tip; Ad -_=a%  
 tip.LoadString(IDS_ICONTIP); !L_xcov!Y  
 data.hIcon=GetIcon(0); s"8z q ;)  
 data.hWnd=GetSafeHwnd(); )a+bH</'  
 strcpy(data.szTip,tip); Z$35`:x&h  
 data.uCallbackMessage=IDM_SHELL; w2U]RI\?2  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; <Zh\6*3:ab  
 data.uID=98; ]*0t?'go'  
 Shell_NotifyIcon(NIM_ADD,&data); !u`f?=s;  
 ShowWindow(SW_HIDE); O_5;?$[m  
 bTray=TRUE; ]HRHF'4  
} DvA#zX[  
P#;pQC  
void CCaptureDlg::DeleteIcon() EAF\ 7J*  
{ z,VXH ?.Zo  
 NOTIFYICONDATA data; 77 ?TRC  
 data.cbSize=sizeof(NOTIFYICONDATA); sr~VvciIy  
 data.hWnd=GetSafeHwnd(); % 5BSXAc  
 data.uID=98; C3 m_sv#e  
 Shell_NotifyIcon(NIM_DELETE,&data); Gr3 q  
 ShowWindow(SW_SHOW); DG3Mcf@5  
 SetForegroundWindow(); ADMeOdgca  
 ShowWindow(SW_SHOWNORMAL); Q0Gfwl  
 bTray=FALSE; ~\%H0.P6  
} IY?o \vC  
bf\ Uq<&IJ  
void CCaptureDlg::OnChange() FE06,i\{  
{ ~0vNs2D,S  
 RegisterHotkey(); &3*r-9BZ  
} TdoH(( nY  
Fo]]j=  
BOOL CCaptureDlg::RegisterHotkey() i-x /h -  
{ O [=W%2I!i  
 UpdateData(); Zh?n;n}  
 UCHAR mask=0; rPHM_fW(O@  
 UCHAR key=0; )P.,h&h/  
 if(m_bControl) [c99m:*+  
  mask|=4; sr:hR Q27  
 if(m_bAlt) >waA\C}  
  mask|=2; _G)x\K]N  
 if(m_bShift) >.REg[P  
  mask|=1;  uHTm  
  key=Key_Table[m_Key.GetCurSel()]; Q|g>ga-a  
 if(bRegistered){ fY|vq amA;  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~\c  j  
  bRegistered=FALSE; pFwe&_u]  
 } XK(aH~7xme  
 cMask=mask; nYK!'x$  
 cKey=key; X)8Edw[?N3  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); 4 @9cO)m  
 return bRegistered; \9} -5  
} &7c#i  
tTJ$tx  
  四、小结 'RR,b*Ql  
?Y9VviC  
  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
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
3+5=?,请输入中文答案:八 正确答案:八