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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: zc,kHO|  
  ?M02|8-  
  一、实现方法 UN,y /V  
fxR}a,a  
  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: $ 2/T]  
i*q!|^M  
#pragma data_seg("shareddata") @qGg=)T  
HHOOK hHook =NULL; //钩子句柄 y%9Q]7&=  
UINT nHookCount =0; //挂接的程序数目 \K,piCVViN  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 ZJ|@^^GcL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 C/sDyv$  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 0'{`"QD\IW  
static int KeyCount =0; e.Y*=P}D  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 xUG:x4Gz+  
#pragma data_seg() 4h[S`;D0Vf  
*`(/wE2v]  
  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。 A \6Q*VhK  
JW`Kh*,~<  
  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: 4 Ii@_r>  
XIrNT:h4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR |H(Mmqgk  
cKey,UCHAR cMask) lvyD#|P  
{ $ZQ?E^> B  
 BOOL bAdded=FALSE; _tGR:E  
 for(int index=0;index<MAX_KEY;index++){ %5zztReI  
  if(hCallWnd[index]==0){ wn$:L9"YN  
   hCallWnd[index]=hWnd; Xc^7  
   HotKey[index]=cKey; q|8p4X}/]  
   HotKeyMask[index]=cMask; _`Abz2s  
   bAdded=TRUE; o4Bl!7U  
   KeyCount++; BhMHT :m  
   break;  W1@Q)i  
  } 9hG+?   
 } YBX7WZCR  
 return bAdded; jJ' LM>e  
} /)ubyl]^p  
//删除热键 vGk}r  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) rLzYkZ  
{ >QusXD"L>  
 BOOL bRemoved=FALSE; )~](qLSl  
 for(int index=0;index<MAX_KEY;index++){ ^1%gQ@P  
  if(hCallWnd[index]==hWnd){ , yC-QFQE  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ p2=Sbb  
    hCallWnd[index]=NULL; x%;Q /7&$  
    HotKey[index]=0; UJ0Dy ` f  
    HotKeyMask[index]=0; jaoGm$o>"F  
    bRemoved=TRUE; mndUQN_Gb  
    KeyCount--; o6} +5  
    break; N1V qK  
   } Q&rf&8iH  
  } J)l]<##  
 } `P`n qn  
 return bRemoved; :*2+t-  
} F7(~v2|  
lRn6Zh  
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  DLL中的钩子函数如下: Y=gj{]4  
]c8$%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) n9zS'VU  
{ \w 6%J77  
 BOOL bProcessed=FALSE; $Xlyc.8YId  
 if(HC_ACTION==nCode) r|Y|u v0  
 { GXEOgf#i  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /WDz;,X  
   switch(wParam) AJ;Y Nb  
   {  Y[Gw<1F_  
    case VK_MENU: k?.HW?=zy  
     MaskBits&=~ALTBIT; lA4Bq  
     break; NLJD}{8Ot  
    case VK_CONTROL: Kis\Rg  
     MaskBits&=~CTRLBIT; u1 uu_*  
     break; 3I_"vk  
    case VK_SHIFT: g~L1e5C]z  
     MaskBits&=~SHIFTBIT; /~_Cb= 7  
     break; YkcX#>,  
    default: //judge the key and send message ;3n0 bKDY  
     break; dt"[5;_P`  
   } VA _O0y2  
   for(int index=0;index<MAX_KEY;index++){ 5L<}u` 0J  
    if(hCallWnd[index]==NULL) I(8,D[G.m  
     continue; 6(4o}Sv  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) YbC6&_  
    { JlsRP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Rk PY@>  
     bProcessed=TRUE; s0Ii;7fA{  
    } &)vX7*j  
   } xDBEs*  
  } S,5>g07-`  
  else if((lParam&0xc000ffff)==1){ //有键按下 ^uW!=%D  
   switch(wParam) KJa?TwnC  
   { ?ng?>!  
    case VK_MENU: 3zb;q@JV  
     MaskBits|=ALTBIT; y+RT[*bX5o  
     break; %r5&CUE5?  
    case VK_CONTROL: Vgs( feGs  
     MaskBits|=CTRLBIT; #K7i<Bf  
     break; 's$pr#V  
    case VK_SHIFT: SVp]}!jI  
     MaskBits|=SHIFTBIT; L%a ni}V  
     break; tg~&kaz  
    default: //judge the key and send message 66=6;77  
     break; yZ,k8TJ",  
   } `n:IXD5'  
   for(int index=0;index<MAX_KEY;index++){ A.vcE  
    if(hCallWnd[index]==NULL) {KL<Hx2M  
     continue; (ju-r*0  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) RR:m <9l  
    { [pbX_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); J p .wg  
     bProcessed=TRUE; CF^7 {g(y_  
    } -8tWc]c |4  
   } l)z15e5X  
  } Q8M&nf  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 nJ4h9`[>V  
   for(int index=0;index<MAX_KEY;index++){ IxCEE5+`%  
    if(hCallWnd[index]==NULL) .i/]1X*;r^  
     continue; (0W%Y Z!&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,"PwNv  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);  zUqiz  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 )dLESk  
   } _]tR1T5e  
  } .jr1<LE  
 } Ta!.oC[  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); g\ @nA4  
} n/s!S &  
*6Rl[eXS  
  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: 'N5qX>Ob  
1 X2oz  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); q y y.3-(  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ,I=Cl mR  
)+ Wr- Yay  
  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: 1l\O9D +$  
nl5K1!1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) yQhrPw> m  
{ |1 is!leP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) -baGr;,Cu  
 { ,-c(D-&  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ;0xCrE{l"  
  SaveBmp(); SBjtg@:G0n  
  return FALSE; _89 _*t(  
 } $7)O&T*q'  
 …… //其它处理及默认处理 `+B+RQl}[  
} 9;Wz;p  
qB]z"Hfq,  
p`1d'n[  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 |gxU;"2`5~  
Xk]5*C]6<  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 X@9_ukdpu  
Oe$cM=Yf  
  二、编程步骤 p>K'6lCa  
;y6Jo  
  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"; 5vbnO]8  
>o 3X)  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 1y0.tdI(  
2I?HBz1v  
  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; j#&sZ$HQ4  
=JO|m5z8>  
  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; 4g\a$7 r  
U]hQ#a+  
  5、 添加代码,编译运行程序。 Ffj:xZ9rk  
r=L9x/r  
三、程序代码 Q(k$HP  
wc bs-arH  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL /GM-#q a  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 2y_rsu\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ J~gfMp.  
#if _MSC_VER > 1000 D{'Na5(  
#pragma once T,7Y7MzF  
#endif // _MSC_VER > 1000 lu(G3T8  
#ifndef __AFXWIN_H__ G:WMocyXI'  
#error include 'stdafx.h' before including this file for PCH ]N=C%#ki!  
#endif .2xypL8(  
#include "resource.h" // main symbols Oku4EJFJ  
class CHookApp : public CWinApp m3_e]v3{o  
{ P603P  
 public: >+vWtO 2  
  CHookApp(); :1Fm~'  
  // Overrides B"KsYB79t  
  // ClassWizard generated virtual function overrides Q=PaTh   
  //{{AFX_VIRTUAL(CHookApp) U"m!f*a  
 public: kP;:s  
  virtual BOOL InitInstance(); 7=QV^G  
  virtual int ExitInstance(); D4'XBXmb  
  //}}AFX_VIRTUAL ~O1*]  
  //{{AFX_MSG(CHookApp)  b 1[U 9  
  // NOTE - the ClassWizard will add and remove member functions here. i $I|JJJ  
  // DO NOT EDIT what you see in these blocks of generated code ! sWavxh8A  
  //}}AFX_MSG ziH2<@  
  DECLARE_MESSAGE_MAP() MqoQs{x  
}; E=QL4*?   
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); g=U?{<8.m  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); X'?v8\mPK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); -'}iK6  
BOOL InitHotkey(); /WHhwMc!  
BOOL UnInit(); mH{cGu?  
#endif lf|^^2'*2<  
uhc0,V;S  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. Gzp)OHgJ  
#include "stdafx.h" M\v4{\2l0  
#include "hook.h" /$eEj  
#include <windowsx.h> *?K` T^LS  
#ifdef _DEBUG oQ yG  
#define new DEBUG_NEW .k*2T<p$rC  
#undef THIS_FILE Q.y KbO<[  
static char THIS_FILE[] = __FILE__; 2OT6*+D  
#endif t&P5Zw*B  
#define MAX_KEY 100 _)_XO92~  
#define CTRLBIT 0x04 p\-.DRwT`  
#define ALTBIT 0x02 oC7#6W:@w  
#define SHIFTBIT 0x01 cF(9[8c{  
#pragma data_seg("shareddata") 4tuEC-oh  
HHOOK hHook =NULL; \~?s= LT  
UINT nHookCount =0; ~ml\|  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey FwW%@Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT iMA)(ZS  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey %BG5[ XQ7  
static int KeyCount =0; _-!6@^+  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift CIaabn  
#pragma data_seg() Bp/8 >E O`  
HINSTANCE hins; GzB%vsv9 5  
void VerifyWindow(); "V^jAPDXb  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ,o}[q92@w  
//{{AFX_MSG_MAP(CHookApp) Y 4714  
// NOTE - the ClassWizard will add and remove mapping macros here. &9ZIf#R  
// DO NOT EDIT what you see in these blocks of generated code! H~G=0_S  
//}}AFX_MSG_MAP ^@19cU?q  
END_MESSAGE_MAP() =OHDp7GXO>  
d.} rn"(z  
CHookApp::CHookApp() ^|K*lI/  
{ S}< <jI-z  
 // TODO: add construction code here, #TSM#Uqe  
 // Place all significant initialization in InitInstance a<o0B{7{BM  
} _:K}DU'6  
jU#%@d6!#  
CHookApp theApp; 7J;.T%4 l  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) =f|>7m.p  
{ ]_pL79y  
 BOOL bProcessed=FALSE; 7>~iS@7GV  
 if(HC_ACTION==nCode) 0[i]PgIH  
 { B}FF |0<  
  if((lParam&0xc0000000)==0xc0000000){// Key up z::2O/ho  
   switch(wParam) C=b5[, UCB  
   { C {,d4KG  
    case VK_MENU: (i?^g &  
     MaskBits&=~ALTBIT; 6h,'#|:d  
     break; f7W=x6Z4  
    case VK_CONTROL: C`#N Q*O  
     MaskBits&=~CTRLBIT; }GC{~ SZ4  
     break; aLq;a  
    case VK_SHIFT: \bsm#vY,  
     MaskBits&=~SHIFTBIT; ibAA:I,d  
     break; d{trO;%#f  
    default: //judge the key and send message LtU+w*Gj  
     break; wS^-o  
   } Rd$<R  
   for(int index=0;index<MAX_KEY;index++){ <'B^z0I,  
    if(hCallWnd[index]==NULL) n^%u9H  
     continue; vJ'ho  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) s6]f#s5o  
    { ~k%\ LZ3s  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); )~n}ieS  
     bProcessed=TRUE; 0IdD   
    }  {Eb6.  
   } Iymz2  
  } evR=Z\ _  
  else if((lParam&0xc000ffff)==1){ //Key down <f*0 XJ#  
   switch(wParam) qXF"1f_+  
   { :ox CF0Y  
    case VK_MENU: FV9RrI2  
     MaskBits|=ALTBIT; HkN +:  
     break; cs5Xd  
    case VK_CONTROL: p~b$+8#+  
     MaskBits|=CTRLBIT; 19vD(KC<  
     break; Mzd}9x$'J  
    case VK_SHIFT: \'KzSkC8  
     MaskBits|=SHIFTBIT; p(8\w-6  
     break; :Rn9rdX  
    default: //judge the key and send message "osYw\unI  
     break; dWUu3  
   } Uoe?5Of(*  
   for(int index=0;index<MAX_KEY;index++) OG+$F  
   { b2Hpuej  
    if(hCallWnd[index]==NULL) QHh#O+by#  
     continue; AK!G#ug  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) UGMdWq  
    { 0#7 dm9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ex1ecPpN  
     bProcessed=TRUE; L}mhMxOTi  
    } x9e 9$ww}  
   } vKC>t95  
  } d0^2<  
  if(!bProcessed){ +x2xQ8#|~~  
   for(int index=0;index<MAX_KEY;index++){ Txh;r.1e  
    if(hCallWnd[index]==NULL) jZ;T&s  
     continue; t]ZSo-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) rij[ZrJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 4Uiqi{}  
   } ZZ(@:F  
  } 24Fxx9 g  
 } *8p</Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); GM/1u fZH  
} bsm,lx]bH^  
qrkT7f  
BOOL InitHotkey() a? kQ2<@g  
{ uz#9w\="  
 if(hHook!=NULL){ j$^]WRt  
  nHookCount++; 5ZVTI,4K  
  return TRUE; K0\WN"ua;  
 } &g!/@*[Nhh  
 else C0%%@ 2+  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); M@\'Y$)Y{  
  if(hHook!=NULL) ]@>|y2  
   nHookCount++; OOCeZ3yF(  
  return (hHook!=NULL); kWd'gftQ  
} DbN'b(+  
BOOL UnInit() Q  [{vU  
{ 4=Ey\Px  
 if(nHookCount>1){ 1|VJND  
  nHookCount--; H.L@]~AyL  
  return TRUE; `{Jb{L@f  
 } 0FOf *Lz  
 BOOL unhooked = UnhookWindowsHookEx(hHook); $#r(1 Ev  
 if(unhooked==TRUE){ 1N+#(<x@,  
  nHookCount=0; Sx2j~(pOr  
  hHook=NULL; IoA;q)  
 } q*O KA5  
 return unhooked; YYHm0pc  
} pA'A<|)K0  
4_<Uk  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qpl5n'qHUc  
{ Q6K)EwN  
 BOOL bAdded=FALSE; Ie"R,,c   
 for(int index=0;index<MAX_KEY;index++){ (4LLTf0  
  if(hCallWnd[index]==0){ 6{'6_4;Fv(  
   hCallWnd[index]=hWnd; 2XHk}M|  
   HotKey[index]=cKey; F0Hbklr  
   HotKeyMask[index]=cMask;  B]7jg9/  
   bAdded=TRUE; Kxn7sL$]=F  
   KeyCount++; o3=kF  
   break; j,XKu5w)Oi  
  } {rZ"cUm  
 } arZIe+KW  
 return bAdded; ">3@<f>  
} +0Gep}&z.  
Zi)b<tM q  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) a"}#HvB+  
{ AX+d?M  
 BOOL bRemoved=FALSE; p0K;m%  
 for(int index=0;index<MAX_KEY;index++){ ~\ f^L?m  
  if(hCallWnd[index]==hWnd){ <Z' hZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lG9ARRy(=  
    hCallWnd[index]=NULL; 3;NRW+  
    HotKey[index]=0; 7VcVI? ?  
    HotKeyMask[index]=0; Q8y|:tb$Y  
    bRemoved=TRUE; >U?Bka!  
    KeyCount--; 4Z }{hc\J  
    break; ItADO'M  
   } mx~sxYa  
  } d&`j 8O  
 } jm\#($gl=  
 return bRemoved; Wi^rnr'S s  
} I?>T"nV +'  
)\vHIXnfJ1  
void VerifyWindow() *a!!(cZZ  
{ dn_OfK  
 for(int i=0;i<MAX_KEY;i++){ x[UO1% _o-  
  if(hCallWnd!=NULL){ e6lOmgHn5  
   if(!IsWindow(hCallWnd)){ K"7;Y#1g  
    hCallWnd=NULL; K/`RZ!  
    HotKey=0; z :v, Vu  
    HotKeyMask=0; RFY!o<   
    KeyCount--; -G#k/Rz6  
   } sG2 3[t8  
  } E]U0CwFtr  
 } `Xdxg\|  
} -P>=WZu  
:-La $I>  
BOOL CHookApp::InitInstance() fhKiG%i'l  
{ .To:tN#  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); <C;> $kX  
 hins=AfxGetInstanceHandle(); V(LFH9.Mp  
 InitHotkey(); .A)Un/k7  
 return CWinApp::InitInstance(); v&2@<I>  
} SzX~;pFM0  
*`Xx_   
int CHookApp::ExitInstance() }Y`<(V5:  
{ bpa O`[*  
 VerifyWindow(); ]31XX=  
 UnInit(); Xe;(y "pR  
 return CWinApp::ExitInstance(); 8Ql'(5|T  
} bs EpET  
W'h0Zg  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ^!o}>ls['  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) (M,VwwN  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Ir"Q%>K0f  
#if _MSC_VER > 1000 m\M+pjz  
#pragma once o MkY#<Q}  
#endif // _MSC_VER > 1000 dqA[|bV  
~h0BT(p/  
class CCaptureDlg : public CDialog ([b!$o<v  
{ y*h1W4:^-  
 // Construction #Jz&9I<OKx  
 public: _/~ ,a  
  BOOL bTray; +'KE T,  
  BOOL bRegistered; C_cs(}wi  
  BOOL RegisterHotkey(); cvE.r330|  
  UCHAR cKey; LG{inhbp  
  UCHAR cMask; 7'i#!5  
  void DeleteIcon(); [ 5 2zta  
  void AddIcon(); P3tG#cJ  
  UINT nCount; U!?gdX  
  void SaveBmp(); 5}bZs` C  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor D%UZ'bHN*  
  // Dialog Data 8<g#$(a_E  
  //{{AFX_DATA(CCaptureDlg) exO#>th1  
  enum { IDD = IDD_CAPTURE_DIALOG }; [ []SkLZHg  
  CComboBox m_Key;  G].__]  
  BOOL m_bControl; $n Sh[ {  
  BOOL m_bAlt; 3*$9G)Ey  
  BOOL m_bShift; M#VC3h$  
  CString m_Path; I9un  
  CString m_Number; $>"e\L4Kp  
  //}}AFX_DATA `1bX.7K43  
  // ClassWizard generated virtual function overrides C]yQ "b  
  //{{AFX_VIRTUAL(CCaptureDlg) h^+C)6(58n  
 public: k\sM;bCv7  
  virtual BOOL PreTranslateMessage(MSG* pMsg); G yAgPz  
 protected: U5CPkH1  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Ldhk^/+  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 1Uemsx%'k  
  //}}AFX_VIRTUAL XL PpxG  
  // Implementation ?Wg{oB@(  
 protected: *UBP]w  
  HICON m_hIcon; }"?nU4q;S  
  // Generated message map functions Zxc7nLKF~  
  //{{AFX_MSG(CCaptureDlg) (s$u_aq 77  
  virtual BOOL OnInitDialog(); ? x"HX|n  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); KBw9(  
  afx_msg void OnPaint(); r<X4ER  
  afx_msg HCURSOR OnQueryDragIcon(); %aH$Tb%`hc  
  virtual void OnCancel(); ] @)!:<+  
  afx_msg void OnAbout(); Kka8cG  
  afx_msg void OnBrowse(); ,{{#a*nd  
  afx_msg void OnChange(); QhX C>)PW  
 //}}AFX_MSG a=*ALd_&0  
 DECLARE_MESSAGE_MAP() MuoctW  
}; ;=-j;x  
#endif a,'Ncg  
{(z(NgXG/  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file UM( l%  
#include "stdafx.h" jc&/}o$K  
#include "Capture.h" }\f(qw  
#include "CaptureDlg.h" +rsl( 08FY  
#include <windowsx.h> g 6VD_  
#pragma comment(lib,"hook.lib") ?QMclzh*-  
#ifdef _DEBUG }#OqU# q|  
#define new DEBUG_NEW Yn4)Zhkk  
#undef THIS_FILE p2x1xv  
static char THIS_FILE[] = __FILE__; (7;J"2M  
#endif q11QAx4p  
#define IDM_SHELL WM_USER+1 7"F|6JP"$c  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); @q+cm JKv  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); j&dx[4|m:h  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; vS$oT]-hKE  
class CAboutDlg : public CDialog &{zwM |Q@?  
{ dY/u<4  
 public: +[whh  
  CAboutDlg(); 4e+BqCriC*  
  // Dialog Data *5y W  
  //{{AFX_DATA(CAboutDlg) n{64g+  
  enum { IDD = IDD_ABOUTBOX }; G(As%r]  
  //}}AFX_DATA GG_^K#*  
  // ClassWizard generated virtual function overrides  ,v*p  
  //{{AFX_VIRTUAL(CAboutDlg) *M wfod  
 protected: df4sOqU  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support U=F-] lD  
  //}}AFX_VIRTUAL 4|6&59?pnc  
  // Implementation BbrT f"`  
 protected: Y9i9Uc.]  
  //{{AFX_MSG(CAboutDlg) Nmp>UE,7[  
  //}}AFX_MSG -@ZzG uS(  
  DECLARE_MESSAGE_MAP() \5'O.*pr  
}; %j *k  
*D?((_+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) [,<\RviI  
{ h4aygc  
 //{{AFX_DATA_INIT(CAboutDlg) \E$1lc  
 //}}AFX_DATA_INIT ,u}<Ws8N  
} OL=ET)Y  
8:HSPDU.  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 9H h~ nR?  
{ X`yNR;>  
 CDialog::DoDataExchange(pDX); .!JMPf"QEI  
 //{{AFX_DATA_MAP(CAboutDlg) 6z#lN>Y-`  
 //}}AFX_DATA_MAP IXZ(]&we  
} Z|ZBKcmg  
XogvtK*  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) wJ+U[a  
 //{{AFX_MSG_MAP(CAboutDlg) 2{t)DUs  
 // No message handlers {)B9Z I{+A  
 //}}AFX_MSG_MAP CKv&Re  
END_MESSAGE_MAP() F!7f_m0=  
,`<^F:xl  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) \|2t TvW,0  
: CDialog(CCaptureDlg::IDD, pParent) \6 \hnP  
{ S3u yn78hI  
 //{{AFX_DATA_INIT(CCaptureDlg) oGm1d{_-O  
  m_bControl = FALSE; 7E$eN8H  
  m_bAlt = FALSE; Fweh =v  
  m_bShift = FALSE; >Hi h  
  m_Path = _T("c:\\"); $gVLk.  
  m_Number = _T("0 picture captured."); %z*29iKlI  
  nCount=0; )A="eW_>  
  bRegistered=FALSE; hZAG (Z  
  bTray=FALSE; f49"pTw7  
 //}}AFX_DATA_INIT <S]KaDu^  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 umQi  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?}vzLgp  
} -a  *NbH  
w`L~#yu  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) yp=|7  
{ pC*BA<?Rg  
 CDialog::DoDataExchange(pDX); ^ED"rMI  
 //{{AFX_DATA_MAP(CCaptureDlg) dh&W;zs  
  DDX_Control(pDX, IDC_KEY, m_Key); 2m_'z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 1"}B]5!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); br0u@G  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); p?Ed- S  
  DDX_Text(pDX, IDC_PATH, m_Path); sFLcOPj-%  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Hqvc7-c6  
 //}}AFX_DATA_MAP >b>M Km>q  
} PzjaCp'  
q@w{c=  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) [%)@|^hw91  
//{{AFX_MSG_MAP(CCaptureDlg) * [tc  
 ON_WM_SYSCOMMAND() 6|,e%  
 ON_WM_PAINT() i90}Xyt  
 ON_WM_QUERYDRAGICON() @l'G[jN5  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) bE?'C h  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) UqN{JG:#.  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 0$tjNy e  
//}}AFX_MSG_MAP qAqoZMpI|;  
END_MESSAGE_MAP() R'zu"I  
\e<mSR  
BOOL CCaptureDlg::OnInitDialog() I*Vt,JYx  
{ %N )e91wC  
 CDialog::OnInitDialog(); VCjq3/[_  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Z<;U:aH?}  
 ASSERT(IDM_ABOUTBOX < 0xF000); D!oZ?dGCo6  
 CMenu* pSysMenu = GetSystemMenu(FALSE); i;c'P}[K  
 if (pSysMenu != NULL) )s7bJjT0=X  
 { V1<ow'^i  
  CString strAboutMenu; %`#G92Z_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); C\ vC?(n  
  if (!strAboutMenu.IsEmpty()) t9.,/o,  
  { OB~C}'^$  
   pSysMenu->AppendMenu(MF_SEPARATOR); P/ci/y_1  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); D?^540,b  
  } wa!zv^;N*  
 } #e/2C  
 SetIcon(m_hIcon, TRUE); // Set big icon T|ZF/&XP  
 SetIcon(m_hIcon, FALSE); // Set small icon :c y >c2  
 m_Key.SetCurSel(0); 9`B0fv Q&  
 RegisterHotkey(); XYe~G@Q Z  
 CMenu* pMenu=GetSystemMenu(FALSE); ,yICNtP  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); /}Yqf`CZy  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); id^|\hDR  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6 }!Z"  
 return TRUE; // return TRUE unless you set the focus to a control pTWg m\h  
} ,9mgYp2  
8lwFAiC8  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) h3kaD  
{ CM9XPr  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) 9RQU?  
 { Gzw@w{JBL  
  CAboutDlg dlgAbout; A:eFd]E{(  
  dlgAbout.DoModal(); }f#_4ACaD  
 } FEF"\O|Q  
 else L}$z/jo  
 { +{.780|  
  CDialog::OnSysCommand(nID, lParam); n#BvW,6J  
 } IU|kNBo  
} O~27/  
QdDObqVdy  
void CCaptureDlg::OnPaint() 9~c~E/4!  
{ 1AF%-<`?s  
 if (IsIconic()) >SoO4i8  
 { /v|Onq1Y4  
  CPaintDC dc(this); // device context for painting _1  p DA  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); /Pvk),ca  
  // Center icon in client rectangle :&qhJtGo  
  int cxIcon = GetSystemMetrics(SM_CXICON); yl$F~e1W  
  int cyIcon = GetSystemMetrics(SM_CYICON); O2.' -  
  CRect rect; >7'+ye6z  
  GetClientRect(&rect); O$qtq(Q%  
  int x = (rect.Width() - cxIcon + 1) / 2; /kB|1gFj  
  int y = (rect.Height() - cyIcon + 1) / 2;  DtWxr  
  // Draw the icon r?p[3JJ;mG  
  dc.DrawIcon(x, y, m_hIcon); ([R")~`(l2  
 } _({@B`N}  
 else KlN/\N\  
 { XE1$K_m  
  CDialog::OnPaint(); vT c7an6fy  
 } YLOwQj'  
} l4vTU=  
4(=kE>n}  
HCURSOR CCaptureDlg::OnQueryDragIcon() R4{-Qv#8 q  
{ E1  |<Pt  
 return (HCURSOR) m_hIcon; "_< 9PM1t  
} 8[zb{PRu  
>;4!O%F  
void CCaptureDlg::OnCancel() M-J<n>hl  
{ sb^mLH] 3  
 if(bTray) l!?yu]Yon  
  DeleteIcon(); F2;:vTA>  
  CDialog::OnCancel(); OQp, 3 M{_  
} NF+<#*1  
FI"HJwAs  
void CCaptureDlg::OnAbout() f+x ;:  
{ l%~lz[  
 CAboutDlg dlg; /=)L_  
 dlg.DoModal(); PD6_)PXn  
} raE Mm  
"AC^ rz~U  
void CCaptureDlg::OnBrowse() "(`2eXRn  
{ c2 Aps  
 CString str; (ChD]PWQ  
 BROWSEINFO bi; E.`6oX\L|  
 char name[MAX_PATH]; !_~UvxM+  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 5\ hd4  
 bi.hwndOwner=GetSafeHwnd(); m#e*c [*G  
 bi.pszDisplayName=name; V`#.7uUP  
 bi.lpszTitle="Select folder"; C\}/"  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8 #}D : (  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); %}3qR~;  
 if(idl==NULL) F~HRME; Z  
  return; 5o)Y$>T0  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8Pmdk1 ~  
 str.ReleaseBuffer(); SZhOm  
 m_Path=str; h Dk)Qg  
 if(str.GetAt(str.GetLength()-1)!='\\') ^/@jwZ  
  m_Path+="\\"; T2FE+A]n9  
 UpdateData(FALSE); v2)g 1sXd  
} < zOi4v0  
5Bjgr  
void CCaptureDlg::SaveBmp() ;65D  
{ " 6CMA 0R  
 CDC dc; KxzYfH  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); `~# < &w  
 CBitmap bm; =*Z5!W'd  
 int Width=GetSystemMetrics(SM_CXSCREEN); 4!.(|h@  
 int Height=GetSystemMetrics(SM_CYSCREEN); ,q#0hy%5/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 2`?!+")  
 CDC tdc; 0w=R_C)s  
 tdc.CreateCompatibleDC(&dc); W!T"m)S  
 CBitmap*pOld=tdc.SelectObject(&bm); t2>fmQIQ  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 7Nzbz3  
 tdc.SelectObject(pOld); o}$1Ay*q`  
 BITMAP btm; "=1;0uy]  
 bm.GetBitmap(&btm); o-C#|t3hH  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; @7oL#-  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 0bS|fMgc  
 BITMAPINFOHEADER bih;  :A1:  
 bih.biBitCount=btm.bmBitsPixel; -0C@hM,wm  
 bih.biClrImportant=0; @-&MA)SN  
 bih.biClrUsed=0; T{+Z(L  
 bih.biCompression=0; 5jB* fIz  
 bih.biHeight=btm.bmHeight; UUc8*yU)  
 bih.biPlanes=1; ?jx1R^  
 bih.biSize=sizeof(BITMAPINFOHEADER); p-GAe,2q  
 bih.biSizeImage=size; >&:NFq-  
 bih.biWidth=btm.bmWidth; )%d*3\Tsd  
 bih.biXPelsPerMeter=0; PG~$D];  
 bih.biYPelsPerMeter=0; CW&.NT  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); eHiy,IN  
 static int filecount=0; 47K1$3P  
 CString name; 9(4&KZpK  
 name.Format("pict%04d.bmp",filecount++); R?o$Y6}5  
 name=m_Path+name; nkfZiyx  
 BITMAPFILEHEADER bfh; l{j~Q^U})  
 bfh.bfReserved1=bfh.bfReserved2=0; *{ {b~$  
 bfh.bfType=((WORD)('M'<< 8)|'B'); b^0}}12  
 bfh.bfSize=54+size; Jl3g{a  
 bfh.bfOffBits=54; PwB1]p=  
 CFile bf; #_93f |  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ G<|8?6bq#  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); @#g<IBG=*  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 2-N 'ya  
  bf.WriteHuge(lpData,size); 4JGtI*%5lq  
  bf.Close(); [* ?Awf`   
  nCount++; Z;/$niY  
 } K%v1xZ  
 GlobalFreePtr(lpData); \%]I{  
 if(nCount==1) u&mS8i}  
  m_Number.Format("%d picture captured.",nCount); @a:>$t  
 else G+UMBn  
  m_Number.Format("%d pictures captured.",nCount); 6 5N~0t  
  UpdateData(FALSE); #X 52/8G  
} R_XR4)(<  
?W^c4NtP  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ,EGQ@:3/  
{ KGH/^!u+R  
 if(pMsg -> message == WM_KEYDOWN) w-wV3Q6X  
 { :L44]K5FL  
  if(pMsg -> wParam == VK_ESCAPE) i0$Bx>  
   return TRUE; *t[. =_v  
  if(pMsg -> wParam == VK_RETURN) E :9"cxx  
   return TRUE; Ez|oN,  
 } FKNMtp[`  
 return CDialog::PreTranslateMessage(pMsg); N ,8/Y  
} =U%Rvm  
AV9m_hZ t  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p2Zo  
{ 7Mb# O_eh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ mGp.3{j  
  SaveBmp(); (q+)'H%iK  
  return FALSE; OxI/%yv-c  
} QnZcBXI8  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ y{dTp  
 CMenu pop; .ZvM^GJb  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); EkgE_8  
 CMenu*pMenu=pop.GetSubMenu(0); vVE2m=!v  
 pMenu->SetDefaultItem(ID_EXITICON); 1N7Kv4,  
 CPoint pt; \b%kf99  
 GetCursorPos(&pt); &l3iV88  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h4q|lA6!k8  
 if(id==ID_EXITICON) z!l.:F  
  DeleteIcon(); .pvi!NnL-  
 else if(id==ID_EXIT) &?mD$Eo  
  OnCancel(); Ty vtmx M  
 return FALSE; ?c[*:N(  
} ,AxdCT  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); QUu}Xg:  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) G:~k.1y[  
 AddIcon(); &f ^,la  
 return res;  =-IbS}3  
} tjupJ*Rt  
Vx~,Uex0+  
void CCaptureDlg::AddIcon() b0lq\9  
{ $2W%2rZ  
 NOTIFYICONDATA data; (p2K36,9m  
 data.cbSize=sizeof(NOTIFYICONDATA); UK<Nj<-'t  
 CString tip; zIh ['^3.n  
 tip.LoadString(IDS_ICONTIP); T6 '`l?H`;  
 data.hIcon=GetIcon(0); bbrXgQ`s+w  
 data.hWnd=GetSafeHwnd(); c-B cA  
 strcpy(data.szTip,tip); 9 FB19  
 data.uCallbackMessage=IDM_SHELL; -r-k_6QP  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ^J$2?!~  
 data.uID=98; R8ZK]5{o  
 Shell_NotifyIcon(NIM_ADD,&data); spt6]"Ni  
 ShowWindow(SW_HIDE); KXx32 b,~  
 bTray=TRUE; e" St_z(  
} j'A_'g'^  
Y;?{|  
void CCaptureDlg::DeleteIcon() _lamn }(x0  
{ /Mvf8v  
 NOTIFYICONDATA data; !\7!3$w'8,  
 data.cbSize=sizeof(NOTIFYICONDATA); ogyTO|V=  
 data.hWnd=GetSafeHwnd(); nih0t^m'  
 data.uID=98; 19w*!FGX  
 Shell_NotifyIcon(NIM_DELETE,&data); 7Zlw^'q$:L  
 ShowWindow(SW_SHOW); wK?vPS  
 SetForegroundWindow(); WA+iYLx@H  
 ShowWindow(SW_SHOWNORMAL);  R}O_[  
 bTray=FALSE; $<}$DH_Y  
} '.:z&gSqx0  
`{dm;j5/y  
void CCaptureDlg::OnChange() o,_? ^'@  
{ n*2UnKaJ  
 RegisterHotkey(); JpXlBEio%  
} hDF@'G8F  
MF5[lK9e  
BOOL CCaptureDlg::RegisterHotkey() 0yD9SJn  
{ k?+?v?I =  
 UpdateData(); .yz}ROmN^  
 UCHAR mask=0; E=nIRG|g  
 UCHAR key=0; vSEuk}pk  
 if(m_bControl) &L=suDe  
  mask|=4; As'=tIro  
 if(m_bAlt) YNQY4\(  
  mask|=2; \W~ N  
 if(m_bShift) =vX/{C  
  mask|=1; gEy?s8_,  
  key=Key_Table[m_Key.GetCurSel()]; [ CQ+p!QZ  
 if(bRegistered){ LY%WD%pL  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 45@^L's  
  bRegistered=FALSE; YtmrRDQs  
 } .(K)?r-g5  
 cMask=mask; ~E17L]ete  
 cKey=key; yDzc<p\`  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); LRL,m_gt  
 return bRegistered; VK m&iidU  
} pFOx>u2`a  
0Tx6zO  
  四、小结 qLD ?juas  
Q'=x|K#xj  
  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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