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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: SW_jTn#x  
  \#)w$O  
  一、实现方法 Oi4tG&q  
XfH[: XG3  
  热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下: d,caOE8N  
JQ]A"xTIa*  
#pragma data_seg("shareddata") 4z>SI\Ss  
HHOOK hHook =NULL; //钩子句柄 924a1  
UINT nHookCount =0; //挂接的程序数目 H)O I&?  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 E?[]N[0Kl  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ,[<+7  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey @a}jnl(2  
static int KeyCount =0; Omy<Y@$  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 )wueR5P  
#pragma data_seg() E(G&mfhb  
?mJ&zf|B8  
  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。 M[7$cfp-Y~  
_mn2bc9M  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ?_b zg'  
V`XtGTx  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR %/Y;  
cKey,UCHAR cMask) w [7vxQ!-  
{ {pyTiz#JY  
 BOOL bAdded=FALSE; &x<y4ORH|  
 for(int index=0;index<MAX_KEY;index++){ &F#K=R| .j  
  if(hCallWnd[index]==0){ %T'<vw0  
   hCallWnd[index]=hWnd; 6E@qZvQ  
   HotKey[index]=cKey; &a bR}J[  
   HotKeyMask[index]=cMask; 79O'S du@  
   bAdded=TRUE; VgyY7INx9  
   KeyCount++; _Kf8,|+  
   break; v)J(@>CZ[  
  } V+&C_PyC  
 } ~V6wcXd  
 return bAdded; |QB[f*y5  
} !U8n=A#,-  
//删除热键 %uy5la  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 24Uvi:B?~  
{ 6#DDMP8;I  
 BOOL bRemoved=FALSE; X{G&r$  
 for(int index=0;index<MAX_KEY;index++){ {<1 ]cP  
  if(hCallWnd[index]==hWnd){ y$C\b\hM  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ErXzKf  
    hCallWnd[index]=NULL; r>ca17  
    HotKey[index]=0; -oR P ZtW  
    HotKeyMask[index]=0; NANgV~Y&  
    bRemoved=TRUE; sw$$I~21  
    KeyCount--; \olYv!f  
    break; I$w:qS&:  
   } Iu|4QE  
  } pDV8B/{  
 } A{Dy3tm=  
 return bRemoved; bx8;`Q MX  
} {YigB  
Usz O--.C  
@[. 0,  
  DLL中的钩子函数如下: aT"0tn^LO  
^(on"3sG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) H4"'&A7$  
{ s2*~n_B  
 BOOL bProcessed=FALSE; -h8@B+  
 if(HC_ACTION==nCode) y0_z_S#gO  
 { r!e:sJAB.  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 WCUaXvw  
   switch(wParam) h"$)[k~  
   {  mfCp@1;26  
    case VK_MENU: G3_HX<|f*  
     MaskBits&=~ALTBIT; qbD>)}:1  
     break; ykat0iqo  
    case VK_CONTROL: oo2CF!Xy  
     MaskBits&=~CTRLBIT; <<l1 zEf@  
     break; YgL{*XYAt  
    case VK_SHIFT: eNc>^:&y*  
     MaskBits&=~SHIFTBIT;  xh|<`>5  
     break; &UfP8GE9  
    default: //judge the key and send message RBOg;EJ  
     break; IB\O[R$x  
   } }NpN<C+  
   for(int index=0;index<MAX_KEY;index++){ wlsq[x P  
    if(hCallWnd[index]==NULL) 0 n}2D7  
     continue; ,y}@I"  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^ZPynduR  
    { #bCQEhCy  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 1=z6m7@'-  
     bProcessed=TRUE; 4U>g0  
    } ^bk:g}o  
   } Fv$oXg/  
  } :erfs}I  
  else if((lParam&0xc000ffff)==1){ //有键按下 V 0z`p"  
   switch(wParam) r@u8QhD  
   { i# bcjH  
    case VK_MENU: 9zE/SDu7\  
     MaskBits|=ALTBIT; eY\w ?pT2  
     break; v+(-\T\i  
    case VK_CONTROL: pPsT,i?  
     MaskBits|=CTRLBIT; I_\?wSNGM  
     break; g$ h`.Fk,  
    case VK_SHIFT: N.UeuLz  
     MaskBits|=SHIFTBIT; ,xI FF-[0  
     break; W:8pmI  
    default: //judge the key and send message Kw=][}d`D  
     break; )}lO%B'K  
   } ^?5HagA  
   for(int index=0;index<MAX_KEY;index++){ H7%q[O  
    if(hCallWnd[index]==NULL) ToR@XL!%rP  
     continue; "6q@}sz!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 10IX8 4  
    { !xvAy3  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); zmhL[1qj  
     bProcessed=TRUE; F4PWL|1  
    } t Z@OAPRx  
   } )|wC 1J!L  
  } =A{s,UP  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Pl\NzB,`  
   for(int index=0;index<MAX_KEY;index++){ Ruv`yfQ  
    if(hCallWnd[index]==NULL) 21[=xboU  
     continue; 7sq15oL  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) z-N N( G+  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); ]w_JbFmT  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 QD^q\9U[  
   } [\-)c[/  
  } `*",_RO;  
 } >u+%H vzc  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); (f;.`W  
} p^k*[3$0  
Zu /w[*;M  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: )F+wk"`+6  
p|g7Z  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); S$n?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m:6*4_!  
\+j:d9?  
  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: Yk0/f|>O  
+CN!3(r  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) J,:Wv`N:9~  
{ 4s 6,`-  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) hc*tQ2  
 { 2Mu@P8O&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 08+\fT [  
  SaveBmp(); C#n.hgo>I  
  return FALSE; tMH 2  
 } SP"t2LTP  
 …… //其它处理及默认处理 *Hz]<b?  
} fd$nAE  
%7[q%S  
:.u2^*<  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 G=er0(7<  
RFPcH8-u7  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 Vsr"W@k_  
fJ=v?  
  二、编程步骤 QXW> }GdKZ  
qOv`&%txW  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; >X xHp  
@r=,: 'Mt  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; '<$*N  
:7~DiH:Q  
  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; mVEIHzk2b  
kD(#LM<9s  
  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; \k{d'R#~(  
Mm;[f'{M)  
  5、 添加代码,编译运行程序。 3&6sQ-}*  
"}vxHN#  
三、程序代码 4~1lP&  
=IKgi-l*  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Gk xtGe  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) NQA2usb  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ Xk!wT2;  
#if _MSC_VER > 1000 \-SC-c  
#pragma once %C_c%3d  
#endif // _MSC_VER > 1000 9/_~YY=/h  
#ifndef __AFXWIN_H__ Hb/8X !=  
#error include 'stdafx.h' before including this file for PCH ]FgKL0  
#endif iBwM]Eyv.  
#include "resource.h" // main symbols r uIgoB  
class CHookApp : public CWinApp J9MAnYd)i  
{ Ym.{ {^=  
 public: ICiGZ'k  
  CHookApp(); gJ~CD1`O  
  // Overrides 7'#_uA QR  
  // ClassWizard generated virtual function overrides R3>c\mA  
  //{{AFX_VIRTUAL(CHookApp) E 02Y,C  
 public: [^W +^3V  
  virtual BOOL InitInstance(); G[6i\Et   
  virtual int ExitInstance(); 7Ck3L6J#  
  //}}AFX_VIRTUAL ZQ>Q=eCs 1  
  //{{AFX_MSG(CHookApp) 9Y@ eXP  
  // NOTE - the ClassWizard will add and remove member functions here. BwrX.!M  
  // DO NOT EDIT what you see in these blocks of generated code ! n5z|@I`S_  
  //}}AFX_MSG M2\c0^R  
  DECLARE_MESSAGE_MAP() )7p(htCz5  
}; ^#IE t#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); jYvl-2A'  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Z1Qv>@u  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K>C@oE[W  
BOOL InitHotkey(); DIfQ~O+u  
BOOL UnInit(); GG"6O_  
#endif 2x<!>B  
Fy0sn|  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. L6#4A3yh  
#include "stdafx.h" }1%%`  
#include "hook.h" T$<yl#FY  
#include <windowsx.h> r-*j"1 e  
#ifdef _DEBUG N.0g%0A.D  
#define new DEBUG_NEW =dsEt\ j  
#undef THIS_FILE @vB-.XU  
static char THIS_FILE[] = __FILE__; jz]}%O  
#endif (>AQ\  
#define MAX_KEY 100 4j8$& ~/  
#define CTRLBIT 0x04 r Nurzag  
#define ALTBIT 0x02 0b['{{X(  
#define SHIFTBIT 0x01 %~} ,N  
#pragma data_seg("shareddata") W 1u!&:O  
HHOOK hHook =NULL; v*&j A 8D  
UINT nHookCount =0; Y`#6MhFT7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey X%iJPJLza  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT K7@|2;e  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey JPHM+3v  
static int KeyCount =0; evpy%/D  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift <LzxnTx=  
#pragma data_seg() V%z?wDC  
HINSTANCE hins; K|l}+:k  
void VerifyWindow(); *[m:4\  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) y/:%S2za>  
//{{AFX_MSG_MAP(CHookApp) I9Uj3cL\  
// NOTE - the ClassWizard will add and remove mapping macros here. G&@d J &B  
// DO NOT EDIT what you see in these blocks of generated code! QBGjH^kL  
//}}AFX_MSG_MAP O=*,  
END_MESSAGE_MAP() .YWkFTlZ+  
!v(^wqna\  
CHookApp::CHookApp() !dUdz7  
{ EeT 69o  
 // TODO: add construction code here, gwdAf%|f  
 // Place all significant initialization in InitInstance KVh#"]<WV  
} {bR2S&=OmK  
N&eo;Ti  
CHookApp theApp; 8a&c=9  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) `6lOqH  
{ K&RIF]0#G  
 BOOL bProcessed=FALSE; 4HR36=E6  
 if(HC_ACTION==nCode) ' Ttsscv  
 { 3l,-n|x  
  if((lParam&0xc0000000)==0xc0000000){// Key up S;jD@j\t&  
   switch(wParam) tv`b##  
   { 1X7GM65#  
    case VK_MENU: tC(MaI  
     MaskBits&=~ALTBIT; p2k`)=iX  
     break; jvAjnh#  
    case VK_CONTROL: ;]b4O4C\  
     MaskBits&=~CTRLBIT; TLp2a<Iy  
     break; 5!cp^[rGL  
    case VK_SHIFT: Sc#3<nVg  
     MaskBits&=~SHIFTBIT; <:NahxIlu  
     break; ^yqRa&  
    default: //judge the key and send message [ZC\8tP`V  
     break; FRajo~H  
   } #/jug[wf*!  
   for(int index=0;index<MAX_KEY;index++){ =[&+R9s  
    if(hCallWnd[index]==NULL) v|\#wrCT?  
     continue; SDV#p];u  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) I>JE\## ^n  
    { y.}{KQ"a*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ?o$ t{AQ  
     bProcessed=TRUE; ?|/K(}  
    } ]z5hTY  
   } (QL:7  
  } zi3v, Kq  
  else if((lParam&0xc000ffff)==1){ //Key down J*MH`;-  
   switch(wParam) <#4""FO*  
   { 1#%H!GKvTU  
    case VK_MENU: F[SZwMf29  
     MaskBits|=ALTBIT; sNcU>qjj6  
     break; IW&*3I<K  
    case VK_CONTROL: dNNXMQ0"  
     MaskBits|=CTRLBIT; leb/D>y  
     break; {9-9!jN{"  
    case VK_SHIFT: dKCl#~LAI'  
     MaskBits|=SHIFTBIT; 3)ox8,{%}  
     break; %8|lAMTY7/  
    default: //judge the key and send message -gk2$P-  
     break; VFx[{Hy  
   } li v=q  
   for(int index=0;index<MAX_KEY;index++) CHZ/@gc  
   { |>.MH  
    if(hCallWnd[index]==NULL) @'):rFr@F  
     continue; `4snTM!v&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) IN<nZ?D#  
    { Xwdcy J!  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);  6?*Do  
     bProcessed=TRUE; 0kj5r*qA  
    } ybqmPT'|_  
   } )W>$_QxbN  
  } =0] K(p,  
  if(!bProcessed){ y6tqemz  
   for(int index=0;index<MAX_KEY;index++){ yP"}(!~m  
    if(hCallWnd[index]==NULL) UPr& `kaJ  
     continue; d~rA`!s7`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) &9)/"  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 036m\7+Qj  
   } 5,s@K>9l;  
  } (lS[a  
 } ZD'mwj+K  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); hnB`+!  
} xvl{o  
#n{4f1TZ  
BOOL InitHotkey() ^67}&O^1 ,  
{ l0`bseN <  
 if(hHook!=NULL){ 0m]QQGvJ{  
  nHookCount++; m//aAxmB  
  return TRUE; NJgu`@YoI  
 } h&CZN !  
 else 2ua!<^,  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 7yT/t1)  
  if(hHook!=NULL) fh3uo\`@  
   nHookCount++; XPqGv=CN  
  return (hHook!=NULL); L(K 5f7\  
} R&;x_4dr^  
BOOL UnInit() GiX3c^V"1  
{ MGMJeq vr  
 if(nHookCount>1){  R*2N\2  
  nHookCount--; JxwKTFU'3O  
  return TRUE; +DX P &Q  
 } fX 1%I  
 BOOL unhooked = UnhookWindowsHookEx(hHook); KYw7Jx`l  
 if(unhooked==TRUE){ <=GZm}/]N  
  nHookCount=0; E;s_=j1f  
  hHook=NULL; IB| 6\uKn  
 } DJ<+" .v!  
 return unhooked; .O'~s/h  
} {[tmz;C  
]s0wJD=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "5<!   
{ F"k`PF*b  
 BOOL bAdded=FALSE;  B>:U  
 for(int index=0;index<MAX_KEY;index++){ i6k6l%  
  if(hCallWnd[index]==0){ ^*`#+*C  
   hCallWnd[index]=hWnd; Jh=.}FXnjL  
   HotKey[index]=cKey; l$\B>u,>  
   HotKeyMask[index]=cMask; 3{|~'5*  
   bAdded=TRUE; 1!G}*38;  
   KeyCount++; 1}Q9y`65  
   break; ; 8DtnnE  
  } BRM `/s  
 } {g1"{  
 return bAdded; VFZ?<m  
} 4]m{^z`1  
^ '|y^t  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) LH_H yP_  
{ |[iO./ zP  
 BOOL bRemoved=FALSE; 3%(r,AD  
 for(int index=0;index<MAX_KEY;index++){ Be@g|'r  
  if(hCallWnd[index]==hWnd){ jQm~F` z  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ >Rt:8uurAG  
    hCallWnd[index]=NULL; }=R0AKz!Cv  
    HotKey[index]=0; :{)uD ;  
    HotKeyMask[index]=0; 5PZ7-WJ/  
    bRemoved=TRUE; K/Yeh<_&  
    KeyCount--; ![ce }  
    break; y[.lfW?)  
   } EGqu-WBS  
  } z-kv{y*Hu  
 } )#i"hnYpQ  
 return bRemoved;  <a $!S  
} N}%AUm/L  
H!7?#tRU  
void VerifyWindow() zn^7#$fC  
{ 7L&,Na  
 for(int i=0;i<MAX_KEY;i++){ 0]*W0#{Zj  
  if(hCallWnd!=NULL){ $t^Td<  
   if(!IsWindow(hCallWnd)){ y `FZ 0FI  
    hCallWnd=NULL; Q njK<}M9  
    HotKey=0; T^#d;A  
    HotKeyMask=0; *5oQZ".vA*  
    KeyCount--; $dKfUlO  
   } ww7nQ}H5(  
  } OAs>F"  
 } 3bezYk  
} )8g& lyT  
=dHdq D  
BOOL CHookApp::InitInstance() a@jM%VZ  
{ OET/4( C  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); ~D}fy  
 hins=AfxGetInstanceHandle(); Ew{*)r)m  
 InitHotkey(); *&IvEu  
 return CWinApp::InitInstance(); /D^ g"  
} $mKExW  
]!^wB 3j  
int CHookApp::ExitInstance() "@ ^<~bw  
{ -QJ8\/1>  
 VerifyWindow(); NY<qoV  
 UnInit(); ktynIN  
 return CWinApp::ExitInstance(); ca3zY|Oo  
} BaI-ve  
oKGF'y?A>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file Ru#pJb(R  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) tzd !r7  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Q.eD:@%iE  
#if _MSC_VER > 1000 c-&Q_lB  
#pragma once W&cs&>F#  
#endif // _MSC_VER > 1000 n_]B5U  
qvo!nr7  
class CCaptureDlg : public CDialog HxW/t7Z(  
{ l lcq~*zz  
 // Construction Nb3O> &J  
 public: x?B`p"ifS  
  BOOL bTray; @<$m`^H  
  BOOL bRegistered; v)O].Hd  
  BOOL RegisterHotkey(); W0mvwYON[  
  UCHAR cKey; h(AL\9{=}  
  UCHAR cMask; R"HV|Dm|m  
  void DeleteIcon(); @8m%*pBg  
  void AddIcon(); =to.Oa RR  
  UINT nCount; p|nPu*R-\  
  void SaveBmp(); U_'M9g{,<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor OhN2FkxL  
  // Dialog Data Ws0)B8y,|  
  //{{AFX_DATA(CCaptureDlg) ,.2qh|Ol  
  enum { IDD = IDD_CAPTURE_DIALOG }; DVwB}W~  
  CComboBox m_Key; vs+aUT C\  
  BOOL m_bControl; |ITCw$T  
  BOOL m_bAlt; -wx~*  
  BOOL m_bShift; :%AEwRZ  
  CString m_Path; C :sgT6  
  CString m_Number; . 4RU'9M  
  //}}AFX_DATA LU8[$.P  
  // ClassWizard generated virtual function overrides tMP"9JE,  
  //{{AFX_VIRTUAL(CCaptureDlg) Oh10X.)i  
 public: -&1P2m/46  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ws QuJrG  
 protected: x|d?'  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support PWp=}f.y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); tj*0Y-F~  
  //}}AFX_VIRTUAL 7D>_<)%d=  
  // Implementation 9 5j`^M)Q  
 protected: Tr}XG  
  HICON m_hIcon; ep},~tPZn  
  // Generated message map functions V8WSJ=-&  
  //{{AFX_MSG(CCaptureDlg) Z*b l J5YC  
  virtual BOOL OnInitDialog(); wE<r'  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); [+W<;iep  
  afx_msg void OnPaint(); X-" +nThMn  
  afx_msg HCURSOR OnQueryDragIcon(); #/H2p`5  
  virtual void OnCancel(); ~;]zEq-hG  
  afx_msg void OnAbout(); TUwX4X6m  
  afx_msg void OnBrowse(); N8kNi4$mp=  
  afx_msg void OnChange(); V'dw=W17V  
 //}}AFX_MSG 2/A*\  
 DECLARE_MESSAGE_MAP() 9* 3;v;F  
}; -~JYfj@  
#endif c V MRSp  
HrZX~JnTmf  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :|ah u  
#include "stdafx.h" 6XCFL-o-  
#include "Capture.h" B:UM2Jl   
#include "CaptureDlg.h" KlS#f  
#include <windowsx.h> GB}=  
#pragma comment(lib,"hook.lib") dP_bFUzg  
#ifdef _DEBUG ,gG RCp  
#define new DEBUG_NEW pJ1\@G  
#undef THIS_FILE 8_Uh h5[  
static char THIS_FILE[] = __FILE__; m:0[as=  
#endif 3'i(wI~<[  
#define IDM_SHELL WM_USER+1 s3@mk\?qMe  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 4:**d[|1  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F(lJ  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9I<~t@q5e@  
class CAboutDlg : public CDialog }!Pty25j  
{ umnQ$y 0  
 public: +rSU  
  CAboutDlg(); CSW+UaE  
  // Dialog Data Gl|n}wo$  
  //{{AFX_DATA(CAboutDlg) B6Ajcfy  
  enum { IDD = IDD_ABOUTBOX }; \k"CtzoX  
  //}}AFX_DATA A*/8j\{n  
  // ClassWizard generated virtual function overrides ~UeTV?)  
  //{{AFX_VIRTUAL(CAboutDlg) XHJ` C\xR  
 protected: YIgHLM(  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support \ %MsG  
  //}}AFX_VIRTUAL [YODyf}M>\  
  // Implementation YXqYIG.G  
 protected: /!;v$es S  
  //{{AFX_MSG(CAboutDlg) [\h?mlG?  
  //}}AFX_MSG /|H9Gm  
  DECLARE_MESSAGE_MAP() 7mXXMm  
}; zAklS 7L  
L{r4hL [  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) %*Mr ^=  
{ :IJ<Mmb  
 //{{AFX_DATA_INIT(CAboutDlg) xz.M'az\  
 //}}AFX_DATA_INIT 1+7_L`SB  
} 0&Ftx%6%  
3< 6h~ek )  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 6:; >id${  
{ LCj3{>{/=  
 CDialog::DoDataExchange(pDX); .GNyA DQp  
 //{{AFX_DATA_MAP(CAboutDlg) 'PFjZGaKR  
 //}}AFX_DATA_MAP q`L )^In"  
} Qmo}esb'(  
2T(+VeMQ=  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 3}mg7KV&  
 //{{AFX_MSG_MAP(CAboutDlg) jgPUR#)  
 // No message handlers Hsv)] %p  
 //}}AFX_MSG_MAP ibwV #6  
END_MESSAGE_MAP() $YY{|8@kjv  
< Mu`,Kv*  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ;Sg.E 8  
: CDialog(CCaptureDlg::IDD, pParent) m0h,!  
{ 52#6uBe  
 //{{AFX_DATA_INIT(CCaptureDlg) m2l9([u=^  
  m_bControl = FALSE; )wD/<7;  
  m_bAlt = FALSE; _ gYj@ %  
  m_bShift = FALSE; _Ds,91<muQ  
  m_Path = _T("c:\\"); y`7<c5zD  
  m_Number = _T("0 picture captured."); 6dz^%Ub  
  nCount=0; Ac|dmu  
  bRegistered=FALSE; %t!S 7UD  
  bTray=FALSE; .o C! ~'  
 //}}AFX_DATA_INIT YtWw)IK  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 !plu;w  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); OQ wO7Z  
} O_.!qk1R  
qAbmQ{|w  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) fXl2i]L(^B  
{ ]sVWQj  
 CDialog::DoDataExchange(pDX); I"lzOD; eI  
 //{{AFX_DATA_MAP(CCaptureDlg) aTeW#:m  
  DDX_Control(pDX, IDC_KEY, m_Key); @0t[7Nv-1  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); $)9|"q6  
  DDX_Check(pDX, IDC_ALT, m_bAlt); "cBqZzkk9j  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); Lq;iR  
  DDX_Text(pDX, IDC_PATH, m_Path); d-tg^Ot#  
  DDX_Text(pDX, IDC_NUMBER, m_Number); > 3(,s^  
 //}}AFX_DATA_MAP gg%)#0Zi  
} ^_P?EJ,)`  
Qf ~$9?z  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) z;<~j=lP  
//{{AFX_MSG_MAP(CCaptureDlg) &Q}%b7  
 ON_WM_SYSCOMMAND() PO6yE r  
 ON_WM_PAINT() vZ srlHb  
 ON_WM_QUERYDRAGICON() } }~a4p>%  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) n9J{f"`m  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4`:POu&  
 ON_BN_CLICKED(ID_CHANGE, OnChange) wJq$yqos{  
//}}AFX_MSG_MAP [v*q%Mi_  
END_MESSAGE_MAP() !|u?z%  
|?g-8":H8P  
BOOL CCaptureDlg::OnInitDialog() "gm5 DE  
{ m9:ah<  
 CDialog::OnInitDialog(); SvvNk  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); w <"mS*Q  
 ASSERT(IDM_ABOUTBOX < 0xF000); &$_!S!Sa/  
 CMenu* pSysMenu = GetSystemMenu(FALSE); +By'6?22  
 if (pSysMenu != NULL) dlCYdwP  
 { i}v.x  
  CString strAboutMenu; oS9Od8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); ~ @xPoD&  
  if (!strAboutMenu.IsEmpty()) .n YlYY'   
  { &V (6N%A^U  
   pSysMenu->AppendMenu(MF_SEPARATOR); vS0 ii  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !-3;Qj}V  
  } Y \B6c^E)  
 } Z^as ?k(iM  
 SetIcon(m_hIcon, TRUE); // Set big icon il !B={  
 SetIcon(m_hIcon, FALSE); // Set small icon N_iy4W(NU  
 m_Key.SetCurSel(0); g.hYhg'KUh  
 RegisterHotkey(); {GnZ@Q:F  
 CMenu* pMenu=GetSystemMenu(FALSE); M")/6PH8  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ;l @lA)i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ivq(eKy  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6z6\xkr  
 return TRUE; // return TRUE unless you set the focus to a control pXN'vP  
} ?H@<8Ra=3  
s9nPxC&A  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) p!uB8F  
{ {R@V  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) )qbkKCq/FB  
 { ~v pIy-  
  CAboutDlg dlgAbout; (Ll'j0]k>  
  dlgAbout.DoModal();  @,k5T51m  
 } #m?)XB^_  
 else 5toa@#Bc%  
 { AL3iNkEa  
  CDialog::OnSysCommand(nID, lParam); J9]cs?`)  
 } <anKw|  
} kVKAG\F  
_]4 p51r0  
void CCaptureDlg::OnPaint() pl1CPxSdO  
{ >J S^yVk  
 if (IsIconic()) -XV+F@`Md  
 { C&vi7Yx  
  CPaintDC dc(this); // device context for painting 8Ala31  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); z rSPa\M  
  // Center icon in client rectangle v7./u4S|V  
  int cxIcon = GetSystemMetrics(SM_CXICON); {b4`\ I@<  
  int cyIcon = GetSystemMetrics(SM_CYICON); wDW%v@  
  CRect rect; VlA]A,P}i  
  GetClientRect(&rect); ;zD4 #7=  
  int x = (rect.Width() - cxIcon + 1) / 2; }a~hd*-#  
  int y = (rect.Height() - cyIcon + 1) / 2; '&#gs P9  
  // Draw the icon ~).D\Q\  
  dc.DrawIcon(x, y, m_hIcon); jLVD37 P^  
 } t&{;6MiE  
 else =VuSi(d;e{  
 { &*+$38XE^  
  CDialog::OnPaint(); /R=MX>JA;  
 } W>d)(  
} ~BJE~  
HV/:OCK  
HCURSOR CCaptureDlg::OnQueryDragIcon() b6f OHy  
{ |R@T`dW  
 return (HCURSOR) m_hIcon; -~ ~h1  
} j`RG Moq  
;j1E6  
void CCaptureDlg::OnCancel() G)}[!'<rR  
{ }5oI` 9VT  
 if(bTray) 9N9&y^SmD  
  DeleteIcon(); j;coPehB  
  CDialog::OnCancel(); {E Ay~lo  
} jmr .gW  
ZuGd{p$  
void CCaptureDlg::OnAbout() 5qQMGN$K  
{ l|gi2~ %Y  
 CAboutDlg dlg; ~CnnN[g(_  
 dlg.DoModal(); 3jxC}xz)  
} Ei@  
o(jLirnk  
void CCaptureDlg::OnBrowse() xWzybuLp  
{ ktTP~7UVi  
 CString str; wX]$xZ!s  
 BROWSEINFO bi; 23^>#b7st  
 char name[MAX_PATH]; C'$}{%Cc@$  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); +8//mrL_/  
 bi.hwndOwner=GetSafeHwnd(); { %X2K  
 bi.pszDisplayName=name; +M I{B="7.  
 bi.lpszTitle="Select folder"; {HEWU<5  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; `~u=[}w  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); X<;.  
 if(idl==NULL) "PI;/(kR  
  return; ! s =$UC  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); gE\ ^ vaB  
 str.ReleaseBuffer(); Wds>'zzS  
 m_Path=str; c 1F^Gj!8  
 if(str.GetAt(str.GetLength()-1)!='\\') ch0^g8@Q[  
  m_Path+="\\"; $"/l*H\h  
 UpdateData(FALSE); :gwmk9LZ  
} 9#:nlu9  
?;W"=I*3  
void CCaptureDlg::SaveBmp() YTefEG]|q  
{ [y`G p#  
 CDC dc; q ][kD2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); u9S*2'  
 CBitmap bm; ~q566k!Ll!  
 int Width=GetSystemMetrics(SM_CXSCREEN); G^)]FwTs  
 int Height=GetSystemMetrics(SM_CYSCREEN); K _VIk'RB  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 5 [~HL_u;,  
 CDC tdc; tB>!1}v  
 tdc.CreateCompatibleDC(&dc); !ZUUn*e{5  
 CBitmap*pOld=tdc.SelectObject(&bm); [m:cO6DM,  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Cu#n5SF*  
 tdc.SelectObject(pOld); Gpxp8[ {  
 BITMAP btm; -"nkC  
 bm.GetBitmap(&btm); @QmN= X5  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; EX{%CPp7}  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); [IOI&`?D  
 BITMAPINFOHEADER bih; #(614-r/  
 bih.biBitCount=btm.bmBitsPixel; <<d#  
 bih.biClrImportant=0; ]" V_`i7Z  
 bih.biClrUsed=0; i_*yS+Z;  
 bih.biCompression=0; 6NV592  
 bih.biHeight=btm.bmHeight; SzpUCr"  
 bih.biPlanes=1; a%`Yz"<lQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); rwj+N%N  
 bih.biSizeImage=size; yy{YduI  
 bih.biWidth=btm.bmWidth; N/0aO^"V  
 bih.biXPelsPerMeter=0; O/#3QK  
 bih.biYPelsPerMeter=0; O"~[njwkE  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); u|IS7>Sm  
 static int filecount=0; =p.avAuSn  
 CString name; FA-cTF[,(  
 name.Format("pict%04d.bmp",filecount++); K]$PRg1| 3  
 name=m_Path+name; ^O7sQ7V"f=  
 BITMAPFILEHEADER bfh; j$Ndq(<tG  
 bfh.bfReserved1=bfh.bfReserved2=0; dnD@BQ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); >|%3j,<U  
 bfh.bfSize=54+size; [6l0|Y  
 bfh.bfOffBits=54; F;#$Q  
 CFile bf; Fya*[)HBo  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ A;rk4)lij  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Rf4K Rhi  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Fvk=6$d2  
  bf.WriteHuge(lpData,size); %|H]T] s  
  bf.Close(); O MQ?*^eA  
  nCount++; ~`Bk CTT  
 } Y(6ev o&IR  
 GlobalFreePtr(lpData); E}9wzPs  
 if(nCount==1) mF@7;dpr  
  m_Number.Format("%d picture captured.",nCount); hA 5p'a+K  
 else _(J#RH  
  m_Number.Format("%d pictures captured.",nCount); Y({ R\W|  
  UpdateData(FALSE); ] hK}ASC  
} %7mGMa/  
n32"cFPpT  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) _s@PL59,  
{ '-A;B.GV%  
 if(pMsg -> message == WM_KEYDOWN) 5XX)8gAo  
 { P0>2}/;o  
  if(pMsg -> wParam == VK_ESCAPE) }d; 2[fR)  
   return TRUE; \ejHM}w3,  
  if(pMsg -> wParam == VK_RETURN) tm5{h{AM  
   return TRUE; rVP\F{Q4Tr  
 } 0e0)1;t\  
 return CDialog::PreTranslateMessage(pMsg); H'#06zP>5  
} v*Gd=\88  
>Du=(pB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) | U0s1f  
{ >#:SJ?)`T  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KS(H_&j  
  SaveBmp(); AjEy@ /  
  return FALSE; =_BHpgL  
} Y)/|C7~W  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ %bTuE' `b  
 CMenu pop; X7-*`NI^  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); r}qDvC D  
 CMenu*pMenu=pop.GetSubMenu(0); NUVKAAgMX  
 pMenu->SetDefaultItem(ID_EXITICON); `,SL\\%u  
 CPoint pt; ~.3v\Q  
 GetCursorPos(&pt); RN 4?]8  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); *_I`{9~'  
 if(id==ID_EXITICON) |Io:D:  
  DeleteIcon(); U)f('zD  
 else if(id==ID_EXIT) bu6Sp3g  
  OnCancel(); A{;"e^a-^l  
 return FALSE; jC[_uG  
} Q(-&}cY  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 8>WA5:]v  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 5QK%BiDlr  
 AddIcon(); J/P[9m30[  
 return res; +pG+ xI  
} t[+bZUS$~  
"9'3mmZm=?  
void CCaptureDlg::AddIcon() db,?b>,EE  
{ 8<}=f4vUj5  
 NOTIFYICONDATA data; AJ6l#j-  
 data.cbSize=sizeof(NOTIFYICONDATA); ?xv."I%  
 CString tip; N9|J\;fzT  
 tip.LoadString(IDS_ICONTIP); 2iM}YCV  
 data.hIcon=GetIcon(0); v\dQjQu8m  
 data.hWnd=GetSafeHwnd(); eb`3'&zV&)  
 strcpy(data.szTip,tip); &c!6e<o[p  
 data.uCallbackMessage=IDM_SHELL; vC>2%Zgf-  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; O^CBa$  
 data.uID=98; uQc("F  
 Shell_NotifyIcon(NIM_ADD,&data); VsSAb%  
 ShowWindow(SW_HIDE); v#{Nh8n  
 bTray=TRUE; U - OD  
} -V;Y4,:c  
l4i 51S"  
void CCaptureDlg::DeleteIcon() GdUsv  
{ Wap4:wT  
 NOTIFYICONDATA data; {.kIC@^O  
 data.cbSize=sizeof(NOTIFYICONDATA); }Fu1Y@M%  
 data.hWnd=GetSafeHwnd(); uMva5o  
 data.uID=98; 3'x>$5 W  
 Shell_NotifyIcon(NIM_DELETE,&data); v@Eb[7Kq/1  
 ShowWindow(SW_SHOW); 6M&ajl`o  
 SetForegroundWindow(); PEEaNOk 1b  
 ShowWindow(SW_SHOWNORMAL); A z@@0  
 bTray=FALSE; -h7ssf'u[  
} ]QR]#[Tn'  
QAx9W%  
void CCaptureDlg::OnChange() vdn)+fZ;   
{ hd'fWFW N  
 RegisterHotkey(); *~ IHVU  
} a]fFR~ OY  
ZKrK >X  
BOOL CCaptureDlg::RegisterHotkey() \?t8[N\_[(  
{ )t+pwh!8  
 UpdateData(); U[3w9  
 UCHAR mask=0; =(hBgNH  
 UCHAR key=0; mD7NQ2:wA  
 if(m_bControl) `AE6s.p?  
  mask|=4; :Ef!gpS}?R  
 if(m_bAlt) zqt<[=O  
  mask|=2; sE&nEc  
 if(m_bShift) #2i$:c~  
  mask|=1; lz>00B<Z  
  key=Key_Table[m_Key.GetCurSel()]; Bj4c_YBte  
 if(bRegistered){ vkJyD/;=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); N KgEs   
  bRegistered=FALSE; kM4z %  
 } e@V J-s  
 cMask=mask; |DW^bv  
 cKey=key; 2~/`L=L  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); XdDQ$'*X  
 return bRegistered; SujEF` "  
} VtzZ1/J E  
Pi=FnS  
  四、小结 aWimg6q  
|-vyhr 0  
  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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