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用Visual C++实现屏幕抓图程序

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 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: ?vFtv}@\  
  < {h \Msx%  
  一、实现方法 eJ6 #x$I,  
>f4[OBc  
  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: i(;.Y  
_ gGA/   
#pragma data_seg("shareddata") U2LD_-HZ  
HHOOK hHook =NULL; //钩子句柄 Cm]\5}Py  
UINT nHookCount =0; //挂接的程序数目 BLAF{vVaf  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 my/KsB  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 GQjwr(  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey RI+Y+z  
static int KeyCount =0; Z>l|R C  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 X"9N<)C  
#pragma data_seg() ~dzD7lG6  
#U4 f9.FY*  
  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。 N3zZ>#{  
7rYBFSp  
  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: =oM#]M'G+(  
2%pU'D:  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR _BONN6=*y  
cKey,UCHAR cMask) zeq")A  
{ IVy<>xpt  
 BOOL bAdded=FALSE; oW(EV4J"  
 for(int index=0;index<MAX_KEY;index++){ l`uMtv/Wp  
  if(hCallWnd[index]==0){ yo(MJ^=d  
   hCallWnd[index]=hWnd; $|@pY| f  
   HotKey[index]=cKey; a:OMI  
   HotKeyMask[index]=cMask; /r2S1"(q  
   bAdded=TRUE;  ZpMv16  
   KeyCount++; YQtq?&0Ct  
   break; n 83Dt*O  
  } +XSe;xk;rD  
 } aX zb]">  
 return bAdded; vxug>2  
} 7yXJ\(6R_  
//删除热键 lMG+,?<uK&  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1GIBqs~-  
{ }/#*opcv  
 BOOL bRemoved=FALSE; n).*=YLN  
 for(int index=0;index<MAX_KEY;index++){ KUq7Oa !  
  if(hCallWnd[index]==hWnd){ &,3s2,1U(  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ cLRzm9  
    hCallWnd[index]=NULL; LwTdmR  
    HotKey[index]=0; /n6ZN4  
    HotKeyMask[index]=0; oRJ!TAbD  
    bRemoved=TRUE; UG_ PrZd  
    KeyCount--; h?$J;xn  
    break; W /*?y &  
   } 2(x| %  
  } X @pm!c#  
 } c##tP*(  
 return bRemoved; `.dwG3R  
} *B \ @L  
6!?] (  
V;^N:I\js  
  DLL中的钩子函数如下: FFcIOn  
XR 3 dG:  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) KeB??1S  
{ /9,'.  
 BOOL bProcessed=FALSE; D?8(n=#[  
 if(HC_ACTION==nCode) _ker,;{9C  
 { 7&/1K%x9;  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Q`NdsS2  
   switch(wParam) :WsHP\r  
   {  /Oi(5?Jn  
    case VK_MENU: Z {:;LC  
     MaskBits&=~ALTBIT; XT*/aa-1'  
     break; Z_edNf }|  
    case VK_CONTROL: D(TG)X?  
     MaskBits&=~CTRLBIT; 9+$IulOvk  
     break; 2+?W{yAEi  
    case VK_SHIFT: *DXX*9 0  
     MaskBits&=~SHIFTBIT; v=+3AW-|v  
     break; {\NBNg(Vo  
    default: //judge the key and send message r> Xk1~<!  
     break; 9W+DW_M  
   } $tI<MZ&Z  
   for(int index=0;index<MAX_KEY;index++){ J] w3iYK  
    if(hCallWnd[index]==NULL) =tY%`e  
     continue; lkly2|wA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) BlZB8KI~  
    { ~c] q:pU2  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); jIwN,H1$-  
     bProcessed=TRUE; ){z#Y#]dP  
    } tw =A] a*  
   } DU)q]'[u  
  } yPe9KN_  
  else if((lParam&0xc000ffff)==1){ //有键按下 2{Dnfl'k  
   switch(wParam) <#;5)!gr{  
   { Mk=*2=d  
    case VK_MENU: UZmUYSu;  
     MaskBits|=ALTBIT; ->o[ S0  
     break; r$-P  
    case VK_CONTROL: E2t& @t%W  
     MaskBits|=CTRLBIT; 6J#R1.h  
     break; q*,HN(& l?  
    case VK_SHIFT: #H<}xC2  
     MaskBits|=SHIFTBIT;  LAM{ ,?~  
     break; `B&=ya|bl  
    default: //judge the key and send message K'e,9P{  
     break; u"%D;  
   } It/hXND `  
   for(int index=0;index<MAX_KEY;index++){ 6v]`s  
    if(hCallWnd[index]==NULL) dZ8ldpf8  
     continue; I Z*)  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ZXkrFA |  
    {  - US>].  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); H3vnc\d~  
     bProcessed=TRUE; a&2x;diF  
    } EYZ&%.Sy5  
   } OwPHp&{ Y  
  } !4gHv4v ;  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 n[r1h=?j3  
   for(int index=0;index<MAX_KEY;index++){ ujN~l_ 4  
    if(hCallWnd[index]==NULL) {dP6fr1z  
     continue; S.`hl/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z C$F@  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); t9*e"QH  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (3Xs  
   } ]dl.~;3~~  
  } "PWGtM:L8Y  
 } Z__fwv.X[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); | oM`  
} k%\y,b*  
^'du@XCf}  
  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: w8j pOvj  
<HTz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); pDJN}XtjT  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -{J0~1'#-  
?~T(Cue>  
  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: /*BK6hc  
m8x?`Gw~jw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) %K8YZc(&  
{ a5O$he  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) 0H.bRk/P+  
 { kka{u[ruA  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 7fzH(H  
  SaveBmp(); M #0v# {o  
  return FALSE; K^[m--  
 } ~;pP@DA  
 …… //其它处理及默认处理 B0p;Zh  
} lKU{jWA  
`#85r{c$:  
tJQZRZViu  
  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。 uOKD#   
-^t.eZ*|  
  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。 GUM-|[~  
J#4pA{01w  
  二、编程步骤 \I/"W#\SJo  
1M?x,N_W  
  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"; PY4a3dp U  
{iq^CHAVK  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 1:M'|uc  
xaB#GdD  
  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; 7mv([}Va  
nRw.82eK.  
  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; 2XV|(  
7h!nt=8Y  
  5、 添加代码,编译运行程序。 EbVC4uY  
nGK=Nf.5  
三、程序代码 QhAYCw2  
oa5L5Zr,A  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL j jv'"K2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) +XX5;;IC  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ BILZ XMf  
#if _MSC_VER > 1000 Yt:%)&50}-  
#pragma once  r3OtQ  
#endif // _MSC_VER > 1000 `*yOc6i]  
#ifndef __AFXWIN_H__ EV* |\ te  
#error include 'stdafx.h' before including this file for PCH -iW>T5f  
#endif tQyQ+1  
#include "resource.h" // main symbols WLh!L='{BK  
class CHookApp : public CWinApp mI:D  
{ J|o<;9dg1  
 public: KyDd( 'i  
  CHookApp(); q3-cWfU  
  // Overrides j5[ >HL  
  // ClassWizard generated virtual function overrides -Gl!W`$I `  
  //{{AFX_VIRTUAL(CHookApp) LV0gw"  
 public: ?}W#j  
  virtual BOOL InitInstance(); ?$<~cD" Sw  
  virtual int ExitInstance(); CI \O)iB  
  //}}AFX_VIRTUAL Bd;EI)JT  
  //{{AFX_MSG(CHookApp) GMLx$?=j  
  // NOTE - the ClassWizard will add and remove member functions here. yDe*-N\'W  
  // DO NOT EDIT what you see in these blocks of generated code ! L"?4}U:  
  //}}AFX_MSG ?;(!(<{  
  DECLARE_MESSAGE_MAP() JJM!pD\h  
}; 0|0IIgy  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ,m7Z w_.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9!2$?xqym  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j E5=e</  
BOOL InitHotkey(); zH~g5xgh  
BOOL UnInit(); c$u#U~~  
#endif 6"rS?>W/mO  
FcOrA3tt  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. |\"%Dy[m  
#include "stdafx.h" i*09m^r  
#include "hook.h" ygQAA!&']  
#include <windowsx.h> 7<2?NLE8*  
#ifdef _DEBUG eCg|@d%D  
#define new DEBUG_NEW lD _iIe~c  
#undef THIS_FILE kZ:~m1dd  
static char THIS_FILE[] = __FILE__; |qf9-36   
#endif *l0i}"T^_  
#define MAX_KEY 100 #a8i($k{e  
#define CTRLBIT 0x04 1OqVNp%K  
#define ALTBIT 0x02 u+jx3aP:  
#define SHIFTBIT 0x01 ~+RrL,t#  
#pragma data_seg("shareddata") xBw ua;  
HHOOK hHook =NULL; t)(>E'X x  
UINT nHookCount =0; {cw+kY]m4-  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey eR3MU]zF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT +K;%sAZy  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey IWhe N  
static int KeyCount =0; ms+gq  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift -*?{/QmKb  
#pragma data_seg() 3A\Hiy!{F  
HINSTANCE hins; Lr"`OzDz  
void VerifyWindow(); pf=CP%L  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) {gDoktC@M  
//{{AFX_MSG_MAP(CHookApp) ^*~4[?]S  
// NOTE - the ClassWizard will add and remove mapping macros here. *iPBpEWC  
// DO NOT EDIT what you see in these blocks of generated code! &,]yqG 2  
//}}AFX_MSG_MAP A  j>  
END_MESSAGE_MAP() y] $- :^  
,qdZ6bv,]|  
CHookApp::CHookApp() H a`V"X{}  
{ Z$)jPDSr  
 // TODO: add construction code here, B|;?#okx  
 // Place all significant initialization in InitInstance |l?*' =  
} k9&pX8#  
mT1Q7ta*P  
CHookApp theApp; ,/Y$%.Rp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) |qq29dS?  
{ %8|?YxiZ:  
 BOOL bProcessed=FALSE; Az(J @  
 if(HC_ACTION==nCode) bGB5]%v,  
 { zn\$6'"  
  if((lParam&0xc0000000)==0xc0000000){// Key up ).$kp2IN  
   switch(wParam) ]k.YG!$  
   { p!K]c D  
    case VK_MENU: g8Zf("  
     MaskBits&=~ALTBIT; &=.7-iC|W  
     break; + j6^g*  
    case VK_CONTROL: s! sG)AR.J  
     MaskBits&=~CTRLBIT; k~$}&O  
     break; M:K4o%  
    case VK_SHIFT: SR9M:%dga  
     MaskBits&=~SHIFTBIT; ` B+Pl6l)F  
     break; Pj*"2 LBW#  
    default: //judge the key and send message -9"[/  
     break; piPV&ytI  
   } Jqt|' G3  
   for(int index=0;index<MAX_KEY;index++){ hXn@vK6  
    if(hCallWnd[index]==NULL) T@N)BfkB  
     continue; '[[*(4 a3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [8`^_i=#  
    { ery{>|k  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 28xLaob  
     bProcessed=TRUE; xEe3,tb'e  
    } 3:!5 ]  
   } 0a v2w5>af  
  } z8w@pT  
  else if((lParam&0xc000ffff)==1){ //Key down 7!8R)m^1[  
   switch(wParam) BUEV+SZ4  
   { mDIN%/S'  
    case VK_MENU: =$vy_UN  
     MaskBits|=ALTBIT; B+=Xb;p8  
     break; \YF'qWB  
    case VK_CONTROL: fu`|@S  
     MaskBits|=CTRLBIT; th|TwD&mO  
     break; ebB8.(k9G3  
    case VK_SHIFT: YR68'Sft[  
     MaskBits|=SHIFTBIT; GG`;c?d@  
     break; =xHzhh  
    default: //judge the key and send message jR,3 -JQ  
     break; dv \aP  
   } 'ewVn1ME[  
   for(int index=0;index<MAX_KEY;index++) #K[6Ai=We}  
   { VK$s+"  
    if(hCallWnd[index]==NULL) n0'"/zyc  
     continue; e&XJK*Wf   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %0Ke4c  
    { T9Pu V  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); T Z@S?r>^  
     bProcessed=TRUE; Tn\59 (  
    } TZS:(MJ9M  
   } >U[YSsFt6  
  } u]QG^1.qYe  
  if(!bProcessed){ JztSP?  
   for(int index=0;index<MAX_KEY;index++){ T#R*]  
    if(hCallWnd[index]==NULL) UL\gcZ Zkl  
     continue; Vb8{OD3PK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) QU^?a~r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); w<=-n ;2  
   } se]QEd7]7  
  } YH$whJ`W0  
 } w,zgYX&  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); V%!my[b  
} +K*_=gHF.  
{FNq&)#`  
BOOL InitHotkey() W q>qso  
{ -VRKQNT  
 if(hHook!=NULL){ #jR1ti)p  
  nHookCount++; zRF +D+  
  return TRUE; $8Y|& P  
 } u-#J!Z<T8  
 else -Mufo.Jz1o  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); a6.0 $'  
  if(hHook!=NULL) PsoW:t  
   nHookCount++; ++M%PF [ {  
  return (hHook!=NULL); Z"g6z#L&  
} 6I$:mHEhd  
BOOL UnInit() 1 gx(L*y,  
{ {'eF;!!Dy  
 if(nHookCount>1){ 7W\aX*]  
  nHookCount--; m^ [VM&%  
  return TRUE; S?LUSb  
 } sBm/9vu  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #_[W*-|L  
 if(unhooked==TRUE){ RiM!LX  
  nHookCount=0; g7U>G=,;?U  
  hHook=NULL; +%RB&:K7,  
 } ]k.'~ Syz  
 return unhooked; QDJ:LJz\  
} w `r)B`!g  
9q f=P3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) - -H%FYF`  
{ :~+m9r  
 BOOL bAdded=FALSE; w?zY9Fs=s  
 for(int index=0;index<MAX_KEY;index++){ tR% &.,2  
  if(hCallWnd[index]==0){ B< BS>(Nr>  
   hCallWnd[index]=hWnd; 14;lB.$p  
   HotKey[index]=cKey; |9cSG),z  
   HotKeyMask[index]=cMask; /"OJ~e_%  
   bAdded=TRUE; 9\D0mjn=l  
   KeyCount++; YO^iEI.  
   break; W0>fu>  
  } H g;;>  
 } AIa#t#8${  
 return bAdded; (dVrGa54  
} :#zv,U&OC  
?3+>% bO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 0I@Cx {$  
{ ac??lHtH9  
 BOOL bRemoved=FALSE; `SSUQ#@  
 for(int index=0;index<MAX_KEY;index++){ rCdf*;  
  if(hCallWnd[index]==hWnd){ i7(\i2_P  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ vAp?Zl?g  
    hCallWnd[index]=NULL; ^L;k  
    HotKey[index]=0; Q.Ljz Z  
    HotKeyMask[index]=0; i@ XFnt  
    bRemoved=TRUE; CHRO9  
    KeyCount--; oc3}L^aD  
    break; (N25.}8Y  
   } '=eE6=m^K  
  } <FFaaGiE>  
 } @:"GgkyDl#  
 return bRemoved; koAM",5D  
} [v$NxmRu  
#[{xEVf  
void VerifyWindow() mjz<,s`D  
{ '+{dr\nJ  
 for(int i=0;i<MAX_KEY;i++){ l]o)KM<  
  if(hCallWnd!=NULL){ 6 C|]Fm  
   if(!IsWindow(hCallWnd)){ SQd`xbIuL  
    hCallWnd=NULL; iNAaTU  
    HotKey=0; HfgK0wIi  
    HotKeyMask=0; Rr>h8Ni <  
    KeyCount--; hPHrq{YZ  
   } Du2v,n5@  
  } vAMr&[  
 } j L[ hB  
} Y2,\WKa  
$"&U%3  
BOOL CHookApp::InitInstance() aY7.<p*a  
{ H;O PA8\n  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); f:-dw6a=s  
 hins=AfxGetInstanceHandle(); Ew kZzVuX  
 InitHotkey(); t846:Z%[  
 return CWinApp::InitInstance(); W=k%aB?p  
} Ly$s0.!  
z.7'yJIP#  
int CHookApp::ExitInstance() )bG d++2  
{ h8MkfHH7{  
 VerifyWindow(); ]XH}G9X^  
 UnInit(); JrdH6Zg  
 return CWinApp::ExitInstance(); ].eY]o}=  
} )tV^)n[w  
Z|kMoB  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >O{/%(9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) uF=xo`=|  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ yNb :zoT  
#if _MSC_VER > 1000 sC .R.  
#pragma once {PCf'n  
#endif // _MSC_VER > 1000 E|A,NPf%I  
T?Dq2UW  
class CCaptureDlg : public CDialog CF`fn6  
{ tyLR_@i%%  
 // Construction \#A=twp  
 public: r2*'5jk_  
  BOOL bTray; K{&b "Ba1  
  BOOL bRegistered; Q b|.;_  
  BOOL RegisterHotkey(); O<x53MN^  
  UCHAR cKey; +RO=a_AS  
  UCHAR cMask; [,|Z<  
  void DeleteIcon(); [n_H9$   
  void AddIcon(); Dg LSDKO!  
  UINT nCount; ew n/@;E  
  void SaveBmp(); ",ic" ~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor ^<e"OV  
  // Dialog Data o\luE{H .?  
  //{{AFX_DATA(CCaptureDlg) (qP !x 2j  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0P_Y6w+  
  CComboBox m_Key; QJG]z'c+  
  BOOL m_bControl; 63$ R')  
  BOOL m_bAlt; 2ju1<t,8)  
  BOOL m_bShift; ibOXh U  
  CString m_Path; D^Z~>D6  
  CString m_Number; A_t<SG5  
  //}}AFX_DATA O;A/(lPW+  
  // ClassWizard generated virtual function overrides ]rh)AE!Y(  
  //{{AFX_VIRTUAL(CCaptureDlg) JAA P5ur  
 public: \\D~Yg\#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); A*h)p@3t<  
 protected: [^gSWU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support bz~-uHC  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); _l?5GLl_F$  
  //}}AFX_VIRTUAL f-\l<o(  
  // Implementation Z v=p0xH  
 protected: y^C; ?B<  
  HICON m_hIcon; *4zVK/FJ  
  // Generated message map functions "z }bgy  
  //{{AFX_MSG(CCaptureDlg) /Ki :6  
  virtual BOOL OnInitDialog(); N[}XLhbt  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _W: S>ij(  
  afx_msg void OnPaint(); >NwrJSx  
  afx_msg HCURSOR OnQueryDragIcon(); u%O^hcfb  
  virtual void OnCancel(); J<_&f_K0]  
  afx_msg void OnAbout(); LwUvM  
  afx_msg void OnBrowse(); (D8'qx-M  
  afx_msg void OnChange(); &-+&`h|s  
 //}}AFX_MSG |k'I?:'  
 DECLARE_MESSAGE_MAP() {kJ[)7  
}; XEZ6%Q_  
#endif $Mx.8FC +  
kmW!0hm;e  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file lb1(1 |#  
#include "stdafx.h" \Mlj 7.u]  
#include "Capture.h" U gB  
#include "CaptureDlg.h" e7L;{+XI  
#include <windowsx.h> yh5KN_W  
#pragma comment(lib,"hook.lib") Y@.> eS  
#ifdef _DEBUG 9GZF39w u  
#define new DEBUG_NEW d1j v>tu  
#undef THIS_FILE LM _4.J  
static char THIS_FILE[] = __FILE__; &V( LeSI  
#endif wH#k~`M  
#define IDM_SHELL WM_USER+1 N13 <!QQ  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); CWkm\=  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); No[xf9>t  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; &F#X0h/m=  
class CAboutDlg : public CDialog bi^LpyEn  
{ I{cn ,,8  
 public: ecf7g)+C  
  CAboutDlg(); xDr *|d  
  // Dialog Data 1'_OM h*;  
  //{{AFX_DATA(CAboutDlg) t*Q12Q  
  enum { IDD = IDD_ABOUTBOX }; 'd?8OV  
  //}}AFX_DATA PfrW,R~r  
  // ClassWizard generated virtual function overrides JsPuxu_  
  //{{AFX_VIRTUAL(CAboutDlg) :OI!YR%"  
 protected: v2@M,xbxF:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Fr%KO)s2  
  //}}AFX_VIRTUAL udc9$uO  
  // Implementation `%ymg8^  
 protected: 0/KNXz  
  //{{AFX_MSG(CAboutDlg) &U 'Ds!  
  //}}AFX_MSG !#iP)"O  
  DECLARE_MESSAGE_MAP() hG us!p"lw  
}; db%`- UST  
TU. h  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) # |UrHK;  
{ ;U`HvIch  
 //{{AFX_DATA_INIT(CAboutDlg) 0XozYyq  
 //}}AFX_DATA_INIT 103Ik6.o  
} _X.M,id  
Ar'5kPzY>  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .Yu,&HR  
{ d&'6l"${  
 CDialog::DoDataExchange(pDX); @pko zE-  
 //{{AFX_DATA_MAP(CAboutDlg) &(.ZHF  
 //}}AFX_DATA_MAP R a*9d]N@  
} <b Ta88,)  
Vr0RdO  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) b`:Eo+p   
 //{{AFX_MSG_MAP(CAboutDlg) jY?%LY@5I  
 // No message handlers *smo{!0Gg  
 //}}AFX_MSG_MAP ?y04g u6p  
END_MESSAGE_MAP() :!A@B.E  
Q'=!1^&  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) aVtwpkgZ  
: CDialog(CCaptureDlg::IDD, pParent) 4*dT|NU  
{ "1#,d#Q$  
 //{{AFX_DATA_INIT(CCaptureDlg) 1%=,J'AH  
  m_bControl = FALSE; -0\$JAyrx  
  m_bAlt = FALSE; 7I.[1V`  
  m_bShift = FALSE; \dc`}}Lc  
  m_Path = _T("c:\\"); Y|lMa?\E  
  m_Number = _T("0 picture captured."); be@MQ}6>  
  nCount=0; l/I W"A  
  bRegistered=FALSE; iCEX|Tj;  
  bTray=FALSE; n+i}>3'A  
 //}}AFX_DATA_INIT H5aUZ=  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?QMs<  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); A=3 U4L  
} @LmUCP~  
QTyl=z7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $ `ho+  
{ . }1!MK5  
 CDialog::DoDataExchange(pDX); jf2E{48P  
 //{{AFX_DATA_MAP(CCaptureDlg) 3~S~)quwP  
  DDX_Control(pDX, IDC_KEY, m_Key); O0I/^  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ,#m\W8j  
  DDX_Check(pDX, IDC_ALT, m_bAlt); x-W0 h  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); L`p[Dq.  
  DDX_Text(pDX, IDC_PATH, m_Path); 5s|gKM  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Cv=0&S.  
 //}}AFX_DATA_MAP 7)]G"m{  
} fAm2ls7c  
lk'RWy"pw  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =Vv{td  
//{{AFX_MSG_MAP(CCaptureDlg) & 3a+6!L[  
 ON_WM_SYSCOMMAND() l%:_#1?isf  
 ON_WM_PAINT() l{3utQH-=z  
 ON_WM_QUERYDRAGICON() jW*A(bK8:  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2-6-kS)c  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) O|/tRkDMP{  
 ON_BN_CLICKED(ID_CHANGE, OnChange) lDA%M3(p  
//}}AFX_MSG_MAP i}YnJ  
END_MESSAGE_MAP() RU'J!-w{  
HvngjP{>  
BOOL CCaptureDlg::OnInitDialog() I[|I\tW  
{ ["7}u^z@<+  
 CDialog::OnInitDialog(); <*\J 6:^n  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); _\<M58/z  
 ASSERT(IDM_ABOUTBOX < 0xF000); &V ;a:  
 CMenu* pSysMenu = GetSystemMenu(FALSE); .6hH}BM  
 if (pSysMenu != NULL) Mu%'cwp$  
 { 8BN'fWl&E  
  CString strAboutMenu; &d2/F i+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); o]j*  
  if (!strAboutMenu.IsEmpty()) <eI;Jph5  
  { iOyYf!yg  
   pSysMenu->AppendMenu(MF_SEPARATOR); t&oNJq{  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); l%IOdco#  
  } E5 dXu5+ye  
 } D'&L wU,o  
 SetIcon(m_hIcon, TRUE); // Set big icon :z:Blp>nK/  
 SetIcon(m_hIcon, FALSE); // Set small icon Mc6y'w  
 m_Key.SetCurSel(0);  96BMJE'  
 RegisterHotkey(); G1l(  
 CMenu* pMenu=GetSystemMenu(FALSE); ~,:f,FkSQ  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); hG67%T'}A  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Uwp +w  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); cQR1v-Xt  
 return TRUE; // return TRUE unless you set the focus to a control +EB# #  
} bODl q  
7PMZt$n  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) y{N9.H2  
{ p%s D>1k  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) JjmL6(*ui  
 { 76m[o  
  CAboutDlg dlgAbout; YJy*OS_&  
  dlgAbout.DoModal(); HT&0i,`  
 } zxh"@j$?  
 else cm]]9z_<  
 { gr;M  
  CDialog::OnSysCommand(nID, lParam); NR*SEbUU*  
 } >g[W@FhT'k  
} gU?)  
*t_&im%E  
void CCaptureDlg::OnPaint() S|[UEU3FpB  
{  g{%';  
 if (IsIconic()) $o/>wgQY-  
 { @2mP  
  CPaintDC dc(this); // device context for painting 9ZBF1sMg  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); AUC< m.  
  // Center icon in client rectangle >$y >  
  int cxIcon = GetSystemMetrics(SM_CXICON); FMn&2fH  
  int cyIcon = GetSystemMetrics(SM_CYICON); +@Y[i."^J  
  CRect rect; +6=!ve}  
  GetClientRect(&rect); =(ZGaZ}  
  int x = (rect.Width() - cxIcon + 1) / 2; 0 OBkd  
  int y = (rect.Height() - cyIcon + 1) / 2; ~K9U0ypH  
  // Draw the icon .*j+?  
  dc.DrawIcon(x, y, m_hIcon); nR7\ o(!  
 } e0L;V@R  
 else ,:`6x[ +  
 { '!R,)5l0h  
  CDialog::OnPaint(); 6fkr!&Dy7  
 } Cu:Zn%  
} U]|q4!WE  
IfcFlXmt2  
HCURSOR CCaptureDlg::OnQueryDragIcon() ,<1*  
{ 6"7qZq  
 return (HCURSOR) m_hIcon; z'lNO| nU  
} Iqsk\2W]a3  
qC )VT3  
void CCaptureDlg::OnCancel() .N=hA  
{ qj&)w9RLJE  
 if(bTray) />C~a]}  
  DeleteIcon(); +!v RU`  
  CDialog::OnCancel(); M2}<gRL*}J  
} ZhsZy wM  
Nj0)/)<r+  
void CCaptureDlg::OnAbout() aJ8pJ{,P  
{ q3F5\6aN  
 CAboutDlg dlg; [R4x[36Zp  
 dlg.DoModal(); IMza 2  
} GcR`{ 3hO  
(5~C _Y  
void CCaptureDlg::OnBrowse() B$l`9!,  
{ A ? M]5d  
 CString str; 5-^%\?,x  
 BROWSEINFO bi; 8-:k@W  
 char name[MAX_PATH]; zc+;VtP|8  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >A&@Wp1  
 bi.hwndOwner=GetSafeHwnd(); F-^HN%  
 bi.pszDisplayName=name; 1c#'5~nB  
 bi.lpszTitle="Select folder"; G+uiZ (p>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; (fa?f tK  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); s3{s.55{m  
 if(idl==NULL) &._!)al  
  return; a[n$qPm}  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ]%|WE  
 str.ReleaseBuffer(); QIK73^  
 m_Path=str; pGY]Vw Y  
 if(str.GetAt(str.GetLength()-1)!='\\') 7X(]r1-+\  
  m_Path+="\\"; :OCux Sc%5  
 UpdateData(FALSE); 4Umsc>yfK  
} aLi_Hrb9  
+5[oY,^cO  
void CCaptureDlg::SaveBmp() hFMst%:y$  
{ 5lnSa+_/f  
 CDC dc; jJ!-hg4?]  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ).C!  
 CBitmap bm; Wk\@n+Q {]  
 int Width=GetSystemMetrics(SM_CXSCREEN); ^Pd3 7&B4V  
 int Height=GetSystemMetrics(SM_CYSCREEN); T[-c|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); U5!f++  
 CDC tdc; W@,p9=425  
 tdc.CreateCompatibleDC(&dc); 5 xDN&su  
 CBitmap*pOld=tdc.SelectObject(&bm); ]TgP!M&q  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); O}_a3>1DY  
 tdc.SelectObject(pOld); UMuuf6  
 BITMAP btm; kLt9; <L  
 bm.GetBitmap(&btm); *frJ^ Ws{  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; liqR#<  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); lVdT^"~3  
 BITMAPINFOHEADER bih; W[E3P,XS  
 bih.biBitCount=btm.bmBitsPixel; #we>75l{+R  
 bih.biClrImportant=0; vo ;F;  
 bih.biClrUsed=0; t-i6FS-  
 bih.biCompression=0; +xfW`[.{  
 bih.biHeight=btm.bmHeight; +'/}[1q1/T  
 bih.biPlanes=1; ;{f??G  
 bih.biSize=sizeof(BITMAPINFOHEADER); ZuvPDW%  
 bih.biSizeImage=size; V.ji _vX  
 bih.biWidth=btm.bmWidth; ] 5v4^mk  
 bih.biXPelsPerMeter=0; qmA2bw]  
 bih.biYPelsPerMeter=0; oL Vtu5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); _/}Hqh  
 static int filecount=0; & 8' (  
 CString name; 1@^Ek8C  
 name.Format("pict%04d.bmp",filecount++); 7B]:3M6d  
 name=m_Path+name; 1N9< d,  
 BITMAPFILEHEADER bfh; D2</^]3Su  
 bfh.bfReserved1=bfh.bfReserved2=0; +Y)#yGUn  
 bfh.bfType=((WORD)('M'<< 8)|'B'); i*CQor6|z  
 bfh.bfSize=54+size; Tz[?gF.Do  
 bfh.bfOffBits=54; kAN;S<jSE  
 CFile bf; eR-=<0Iw;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ wD ],{y  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ml.;wB|  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #M?F^u[  
  bf.WriteHuge(lpData,size); Ah>gC!F^  
  bf.Close(); o}MzqKfu  
  nCount++; Sf&?3a+f  
 } jD/7/G*  
 GlobalFreePtr(lpData); XDkS ^9  
 if(nCount==1) a3UPbl3^  
  m_Number.Format("%d picture captured.",nCount); /Pn.)Lxfl  
 else {(Og/[  
  m_Number.Format("%d pictures captured.",nCount); %,,`N I{  
  UpdateData(FALSE); ;wXY3|@  
} 3XwU6M$5g  
1Vf78n  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) oY%"2PW1B  
{ a1G9wC:e  
 if(pMsg -> message == WM_KEYDOWN) *i?rJH  
 { J4G> E.8  
  if(pMsg -> wParam == VK_ESCAPE) px _s@>l`  
   return TRUE; ~J1;tZS  
  if(pMsg -> wParam == VK_RETURN) r|^lt7\  
   return TRUE; N(:nF5>_  
 } 4e@&QOo`Cu  
 return CDialog::PreTranslateMessage(pMsg); H+VO.s.a  
} _7lt(f[S  
C NfJ:e2  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) [Iw>|q<e  
{ wKk 3)@il  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ hu P^2*c  
  SaveBmp(); >wKu6- ]a  
  return FALSE; eb!s'@  
} DhLr^Z!h3;  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ uZ\wwYY#M  
 CMenu pop; ^E$(1><-a  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); sK@Y!oF}\  
 CMenu*pMenu=pop.GetSubMenu(0); _k_>aG23  
 pMenu->SetDefaultItem(ID_EXITICON); rToaGQh  
 CPoint pt; "[*S?QO(L  
 GetCursorPos(&pt); /WgPXEB  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); =Y &9 qt  
 if(id==ID_EXITICON) ?aFr8i:)M  
  DeleteIcon(); WVS$O99Y  
 else if(id==ID_EXIT) LBmM{Gu  
  OnCancel(); cX %:  
 return FALSE; (@)2PO /  
} %1\v7Xw{9  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); D[89*@v  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ZT) !8  
 AddIcon(); Cf0|Z  
 return res; ;Y'8:ncDn  
} 6| *(dE2x(  
d"B@c;dD  
void CCaptureDlg::AddIcon() J}Qs"+x  
{ s~=KhP~  
 NOTIFYICONDATA data; qr)v'aC3  
 data.cbSize=sizeof(NOTIFYICONDATA); =[]x\&@t  
 CString tip; 1l/AKI(!  
 tip.LoadString(IDS_ICONTIP); 4>4V-m\  
 data.hIcon=GetIcon(0); ;w`sz.  
 data.hWnd=GetSafeHwnd(); =oE_.ux\  
 strcpy(data.szTip,tip); 5LQk8NPh  
 data.uCallbackMessage=IDM_SHELL; JFkN=YR8  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; WI1T?.Gc   
 data.uID=98; :7p9t.R<$h  
 Shell_NotifyIcon(NIM_ADD,&data); :`0'GM" `  
 ShowWindow(SW_HIDE); l`@0zw+  
 bTray=TRUE; LH=d[3Y  
} |7 &|>  
u64 @"P  
void CCaptureDlg::DeleteIcon() )v%l0_z{  
{ m`hGDp3  
 NOTIFYICONDATA data; -#LjI.  
 data.cbSize=sizeof(NOTIFYICONDATA); CO-Iar  
 data.hWnd=GetSafeHwnd(); /8xH$n&xoC  
 data.uID=98; N'I(P9@  
 Shell_NotifyIcon(NIM_DELETE,&data); izMYVI?0  
 ShowWindow(SW_SHOW); EjWgaV  
 SetForegroundWindow(); 1ZT^)/G  
 ShowWindow(SW_SHOWNORMAL); Wrmgu}q  
 bTray=FALSE; 3A-*vaySV  
} "\}b!gl$8  
!|:RcH[  
void CCaptureDlg::OnChange() $hh+0hs  
{ 8h2D+1,PZC  
 RegisterHotkey(); OmB TA=E<  
} ,H>W:O  
Z6 ;Wd_  
BOOL CCaptureDlg::RegisterHotkey() O\6vVM[  
{ B!eK!B  
 UpdateData(); oJ^C]E  
 UCHAR mask=0; 1p8:.1)q  
 UCHAR key=0; kMM'[w  
 if(m_bControl) jcE Msc  
  mask|=4; 'KH lrmnr  
 if(m_bAlt) }FrEF\}]_7  
  mask|=2; '%R<"  
 if(m_bShift) ~gP7s_ qr{  
  mask|=1; qQ^d9EK'?~  
  key=Key_Table[m_Key.GetCurSel()]; tcZa~3.  
 if(bRegistered){ & =G)NeT_  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); H#OYw#L"u  
  bRegistered=FALSE; %/51o6a  
 } >-!r9"8@  
 cMask=mask; +A@m9  
 cKey=key; <mL%P`Jj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); C 8N%X2R  
 return bRegistered; @B?FE\  
} _ w/_(k  
tl|ijR  
  四、小结 .}o~VT:!?Y  
 Nj+a2[  
  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。
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