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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: "e-RV  
  (GCeD-  
  一、实现方法 `F(ghC  
tz^2?wO  
  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: ',_E;(  
w=;Jj7}L  
#pragma data_seg("shareddata") }CM</  
HHOOK hHook =NULL; //钩子句柄 z+5ZUS2~&  
UINT nHookCount =0; //挂接的程序数目 `)aIFAW  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 7A,lQh  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 H^d2|E[D  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey $n><p>`  
static int KeyCount =0; }G/#Nb)  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 )%zOq:{\5  
#pragma data_seg() HxAN&g *:  
 fOUW{s  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 -qJ%31Mr#  
:lfUVa{HN  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: j@o \d%.'!  
lSG"c+iV  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR \jpm   
cKey,UCHAR cMask) W5SCm(QS5  
{ vyA `Z1  
 BOOL bAdded=FALSE; hI#1Ybl  
 for(int index=0;index<MAX_KEY;index++){ }x~1w:z Hd  
  if(hCallWnd[index]==0){  Lw1aG;5  
   hCallWnd[index]=hWnd; wCitQ0?  
   HotKey[index]=cKey; NZQl#ZJH:  
   HotKeyMask[index]=cMask; 2zPO3xL,  
   bAdded=TRUE; o,q47W=7$  
   KeyCount++; o0)k5P~<~  
   break; e[($rsx  
  } AE@N:a  
 } CG0jZB#u  
 return bAdded; r7zS4;b  
} \UEO$~Km  
//删除热键 \i.Yhl:O  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) HZl//Uq  
{ -Pt']07E  
 BOOL bRemoved=FALSE; = }!4%.$  
 for(int index=0;index<MAX_KEY;index++){ IQ] tcSQl  
  if(hCallWnd[index]==hWnd){ sy(8-zbI  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ !uc"|S?  
    hCallWnd[index]=NULL; K\VL[HP-  
    HotKey[index]=0; wfMtWXd;KB  
    HotKeyMask[index]=0; sQ aP:@  
    bRemoved=TRUE; X4$86  
    KeyCount--; 1 k\~%  
    break; uLq%Nu  
   } S2\|bs7;J,  
  } &_o.:SL|  
 } tj1M1s|a  
 return bRemoved; Nu[0X  
} &a9Y4~e::  
3*C|"|lJ  
5faY{;8  
  DLL中的钩子函数如下: v*lj>)L  
6mml96(  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) U?e.)G  
{ #\T5r*W  
 BOOL bProcessed=FALSE; T\OpPSYbl  
 if(HC_ACTION==nCode) p 02E:?  
 { @x[Arx^?}  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 9NEL[J|  
   switch(wParam) 40m>~I^q}  
   {  -R BH5+SS2  
    case VK_MENU: A>B_~=  
     MaskBits&=~ALTBIT; \1f&D!F]b  
     break; mGC!7^_D`  
    case VK_CONTROL: d+L!s7  
     MaskBits&=~CTRLBIT; QT)5-Jy  
     break; 1=Y pNXX  
    case VK_SHIFT: Z[%vO?,  
     MaskBits&=~SHIFTBIT; yk0#byW`  
     break; SLjSNuOP  
    default: //judge the key and send message py%_XL=w,  
     break; slH3c:j\  
   } ]1dnp]r  
   for(int index=0;index<MAX_KEY;index++){ @#1T-*  
    if(hCallWnd[index]==NULL) =2&Sw(6j  
     continue; ~\o hH  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) l|" SM6  
    { /DE`>eJY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); e .(  
     bProcessed=TRUE; f2,\B6+  
    } "yG*Kh7ur  
   } +AkMU|6  
  } u?V Tnsu  
  else if((lParam&0xc000ffff)==1){ //有键按下 \eoJ6IRE\T  
   switch(wParam) +sm9H"_0  
   { @q++eGm\Q  
    case VK_MENU: *U:0c ;h  
     MaskBits|=ALTBIT; !wr2OxK*  
     break; H+?@LPV*N  
    case VK_CONTROL: ykBq?Vr  
     MaskBits|=CTRLBIT; Scz/2vNi`  
     break; Z_WJgH2c  
    case VK_SHIFT: XM:Y(#?l  
     MaskBits|=SHIFTBIT; qGhwbg  
     break; ]s>y se  
    default: //judge the key and send message K0-AP $  
     break; 8I)}c1j`v  
   } i7|sVz=  
   for(int index=0;index<MAX_KEY;index++){ 8=DZ;]XD.  
    if(hCallWnd[index]==NULL) `CqF&b  
     continue; (>M@Ukam:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) sV$Zf `X)  
    { lCxPR'C|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4VI'd|Ed  
     bProcessed=TRUE; *'\ xlsp#  
    } Tq,xW  
   } "Cn<x\E b  
  } o`%;*tx  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 up )JU [  
   for(int index=0;index<MAX_KEY;index++){ @3WI7q4  
    if(hCallWnd[index]==NULL) pUm|e5  
     continue; ]]!&>tOlI  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !Jk|ha~r  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Wo, "$Z6B  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 K;P<c,9X/  
   } x!;;;iS  
  } vf/|b6'y  
 } Ojs ^-R_  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4u+4LB*  
} D\ kd6  
2y#[uSqB  
  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: M0Vs9K=  
h:~ 8WV|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Q/y"W,H#  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ]h 4r@L3  
z z2'h>  
  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: WOR H4h9  
wpV)y Q^  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) vi~NfD@s  
{ Cy2)M(RW  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) .e1Yd8  
 { k^ e;V`(  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 lL6W:Fq@(  
  SaveBmp(); Y9ipy_@_?  
  return FALSE; bO6LBSZx]  
 } < NlL,  
 …… //其它处理及默认处理 m={TBV,L  
} ~X<Ie9m1x  
Cs?[   
Lf0Wc'9{  
  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。 'l&bg8K9  
dvPlKLp  
  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。 ||o :A  
D{G~7P\.  
  二、编程步骤 zA%$l&QN]  
U^ Ulj/%6  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; `2PvE4]%p  
6o=Q;Mezl  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 4>}qdR1L4  
q&d5V~q  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; R~!md  
NjP7?nXSx  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; \Rz-*zr&  
y6`zdB  
  5、 添加代码,编译运行程序。 Z?j4WJy-[  
2YhtD A  
三、程序代码 :WHbwu,L$  
`ZZq Sc4  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0.lOSAq  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) PsCr[\Ul  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ AroYDR,3+  
#if _MSC_VER > 1000 |Wz`#<t  
#pragma once CaqqH`/E4  
#endif // _MSC_VER > 1000 L{uQ: ;w1  
#ifndef __AFXWIN_H__ / &#b*46  
#error include 'stdafx.h' before including this file for PCH C{2y*sx  
#endif K</="3 HK  
#include "resource.h" // main symbols v/z~ j  
class CHookApp : public CWinApp CA5q(ID_  
{ X3l? YA  
 public: '-NHu +  
  CHookApp(); 'Z 82+uU%  
  // Overrides Vk?US&1q}  
  // ClassWizard generated virtual function overrides P-)`FB  
  //{{AFX_VIRTUAL(CHookApp) }4XXNYH  
 public: _(0GAz%9  
  virtual BOOL InitInstance(); vuO~^N]G  
  virtual int ExitInstance(); =5u;\b>*  
  //}}AFX_VIRTUAL (8jQdbZU  
  //{{AFX_MSG(CHookApp) q~G@S2=}0}  
  // NOTE - the ClassWizard will add and remove member functions here. 1rGi"kdf  
  // DO NOT EDIT what you see in these blocks of generated code ! %IH ra6  
  //}}AFX_MSG 3U&r K)F  
  DECLARE_MESSAGE_MAP() Bl*.N9*  
}; ZP;WXB`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); t^SND{[WcM  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); gQ=l\/ H  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); G[ gfD\  
BOOL InitHotkey(); w .+B h  
BOOL UnInit(); |jJ9dTD8/  
#endif ? H7?>ZE  
sQgJ`+Y8_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. LypBS]r u  
#include "stdafx.h" 6'6,ySo]  
#include "hook.h" t# <(Q  
#include <windowsx.h> .qg 2zE$0  
#ifdef _DEBUG ?i5=sK\  
#define new DEBUG_NEW h[}e5A]}  
#undef THIS_FILE 8s)(e9Sr  
static char THIS_FILE[] = __FILE__; t>%+[7?6  
#endif xay~fD  
#define MAX_KEY 100 X}G3>HcP  
#define CTRLBIT 0x04 ,<O|Iis  
#define ALTBIT 0x02 ^Kfm(E  
#define SHIFTBIT 0x01 ;b;Bl:%?  
#pragma data_seg("shareddata") Zil<*(kv{  
HHOOK hHook =NULL; vd#BT$d?  
UINT nHookCount =0; `| f1^C^  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey $.T\dm-  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }CB9H$FkCY  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey |P(8T'  
static int KeyCount =0; j5V{,lf  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift WdJJt2'  
#pragma data_seg() r>Cv@4/j  
HINSTANCE hins; . E? a  
void VerifyWindow(); Fd1jElt  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) L]#b =Y  
//{{AFX_MSG_MAP(CHookApp) <z R CT  
// NOTE - the ClassWizard will add and remove mapping macros here.  #[yZP9  
// DO NOT EDIT what you see in these blocks of generated code! =L&dV]'4P  
//}}AFX_MSG_MAP 9 gWqs'  
END_MESSAGE_MAP() mWX{I2  
'NSfGC%7R  
CHookApp::CHookApp() u?lbC9}$  
{ 5 ]l8l+  
 // TODO: add construction code here, TpAso[r  
 // Place all significant initialization in InitInstance ~Zo;LSI  
} @JU Xp  
prO ~g  
CHookApp theApp; ^+rI=c 0  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) S- JD}+ 9  
{ #?klVK&e/  
 BOOL bProcessed=FALSE; yLEA bd%+  
 if(HC_ACTION==nCode) Pm== m9  
 { zp:EssO=Q  
  if((lParam&0xc0000000)==0xc0000000){// Key up <(W:Q3?s  
   switch(wParam) xY<*:&  
   { O2N~&<^  
    case VK_MENU: cs0rz= ZdH  
     MaskBits&=~ALTBIT; \<Di |X1  
     break; p%ZAVd*|#V  
    case VK_CONTROL: C1po]Ott*  
     MaskBits&=~CTRLBIT; "T1A$DKw+R  
     break; ;>r E+k%_  
    case VK_SHIFT: p}(pIoyUF  
     MaskBits&=~SHIFTBIT; ZfnJ&H'  
     break; {q.|UCg[L  
    default: //judge the key and send message 3%YDsd vQx  
     break; 6h{>U*N"&d  
   } gX;)A|9e  
   for(int index=0;index<MAX_KEY;index++){ 8&c:73=?X  
    if(hCallWnd[index]==NULL) buA/G-<e  
     continue; IyoitIbLl  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u -A_l<K  
    { wrAcVR  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); bD<hzOa  
     bProcessed=TRUE; H-jxH,mJmW  
    } (Ky$(Ubb#6  
   } .'zcD^  
  } `[F[0fY-  
  else if((lParam&0xc000ffff)==1){ //Key down QR {>]I  
   switch(wParam) ,| ~Pa  
   { :YM1p&|fS  
    case VK_MENU: "P8( R  
     MaskBits|=ALTBIT; OTD<3Q q  
     break; #y*p7~|@  
    case VK_CONTROL: 5m9;'SF  
     MaskBits|=CTRLBIT; 3h**y %^  
     break; KhZ\q|5  
    case VK_SHIFT: WuMr";2*E  
     MaskBits|=SHIFTBIT; O ~D]C  
     break; Z=zD~ka  
    default: //judge the key and send message ~$]Puv1V>  
     break; e7M6|6nb  
   } F`M`c%  
   for(int index=0;index<MAX_KEY;index++) Dn@Sjsj>  
   { 67]!xy  
    if(hCallWnd[index]==NULL) *_/n$& I%&  
     continue; F~wqt7*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Pv3qN{265  
    { Nbd[xs-lw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); sDP8!  
     bProcessed=TRUE; } bm ^`QY  
    } .wf$]oQQ  
   } =&#t ("  
  } 5q _n 69b  
  if(!bProcessed){ r Fhi:uRV  
   for(int index=0;index<MAX_KEY;index++){ Cp^`-=r+  
    if(hCallWnd[index]==NULL) m(CAXq-t  
     continue; W3w$nV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) 1)J' pDa  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); rn RWL4  
   } y;=/S?L.:  
  } "GB493=v  
 } U[ |o!2$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); '4,>#D8@O  
} !+_X q$9_  
~RRS{\,  
BOOL InitHotkey() cS RmC  
{ StU9r0`  
 if(hHook!=NULL){ ^ wb9n  
  nHookCount++; BQL](Y "  
  return TRUE; \T {<{<n  
 } ca,U>'(y  
 else S3gd'Bahq  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); _bSn YhS  
  if(hHook!=NULL) nHl{'|~  
   nHookCount++; |[X-i["y  
  return (hHook!=NULL); X1o=rT  
} *}=z^;_oq  
BOOL UnInit() MR/gLm(8(  
{ d'[]  
 if(nHookCount>1){ pZ5eGA=  
  nHookCount--; ~'0W(~Q8  
  return TRUE; 7uq^TO>9f  
 } Ny G?^  
 BOOL unhooked = UnhookWindowsHookEx(hHook); #]z_pp:  
 if(unhooked==TRUE){ zXML<?w  
  nHookCount=0; {ZKXT8'  
  hHook=NULL; c|Fu6LF a  
 } ? u~?:a@K  
 return unhooked; LTcZdQd$  
} Vr hd\  
|nmt /[  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;TulRx]EA  
{ 0N):8`dY  
 BOOL bAdded=FALSE; s3y"y_u  
 for(int index=0;index<MAX_KEY;index++){ S@cKo&^  
  if(hCallWnd[index]==0){ (lt{$0   
   hCallWnd[index]=hWnd; ?wREX[Tqs  
   HotKey[index]=cKey; ,P^4??' o  
   HotKeyMask[index]=cMask; ,D2nUk  
   bAdded=TRUE; +lZvj=gW  
   KeyCount++; $lb$<  
   break; yny1i9 y  
  } {9- n3j}  
 }  0X}0,  
 return bAdded; sF~!qag4q'  
} qv3% v3\4  
w]O,xO  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?[2>x{5Z  
{ 9}z%+t8u  
 BOOL bRemoved=FALSE; B:#9   
 for(int index=0;index<MAX_KEY;index++){ }X~"RQf9  
  if(hCallWnd[index]==hWnd){ fT.MglJcb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ^CW{`eBwk  
    hCallWnd[index]=NULL; F[*/D/y(  
    HotKey[index]=0; Z+2 j(  
    HotKeyMask[index]=0; 1!Afq}|  
    bRemoved=TRUE; T9bUt|  
    KeyCount--; /&W~:F  
    break; ["sm7yQ  
   } CvRO'  
  } q``:[Sz  
 } *+_+Z DU  
 return bRemoved; C sCH :>  
} mb*|$ysPx  
uMX\Y;N  
void VerifyWindow() 7' Gk ip  
{ Y{9xF8#  
 for(int i=0;i<MAX_KEY;i++){ }70A>JBw  
  if(hCallWnd!=NULL){ tv%B=E!r  
   if(!IsWindow(hCallWnd)){ #3_ @aq*  
    hCallWnd=NULL; '3fN2[(  
    HotKey=0; ~nb1c:F  
    HotKeyMask=0; TNlOj a:  
    KeyCount--; .,\^{.E  
   } Iqq BUH  
  } QBb%$_Z  
 } CTJwZY7  
} #Ve@D@d[  
7yUX]95y8  
BOOL CHookApp::InitInstance() .+&M,% x  
{ yaPx=^&  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); vrIWw?/z?  
 hins=AfxGetInstanceHandle(); ;Q0H7)t:  
 InitHotkey(); OJD!Ar8Q  
 return CWinApp::InitInstance(); a?@lX>Z  
} }z5u^_-m  
~W-5-Nl{s  
int CHookApp::ExitInstance() 5 Q/yPQN  
{ %Ot*k%F  
 VerifyWindow(); <YvW /x  
 UnInit(); a"^rOiXR{  
 return CWinApp::ExitInstance(); \k5 sdHmI[  
}  ^w_\D?  
=3EjD;2  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 'oF XNO  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) }#6~/ W  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i':a|#e>  
#if _MSC_VER > 1000 iw{^nSD  
#pragma once Bo8NY!  
#endif // _MSC_VER > 1000 ef2)k4)"  
eIQ@){lJ-]  
class CCaptureDlg : public CDialog eU\XAN#@  
{ gv,1 CK  
 // Construction u>/Jb+  
 public: +0) H~ qB\  
  BOOL bTray; ijgm-1ECk3  
  BOOL bRegistered; 5]zH!>-F  
  BOOL RegisterHotkey(); J~AmRo0!k  
  UCHAR cKey; KBa0  
  UCHAR cMask; d ;i@9+  
  void DeleteIcon(); & l0LW,Bx  
  void AddIcon(); b8!   
  UINT nCount; Nka 3H7 `  
  void SaveBmp(); d<[L^s9  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0+/ew8~$  
  // Dialog Data a}X. ewg  
  //{{AFX_DATA(CCaptureDlg) t \-|J SZ  
  enum { IDD = IDD_CAPTURE_DIALOG }; D9!$H!T _  
  CComboBox m_Key; n?"("Fiw  
  BOOL m_bControl; *t_Q5&3L+U  
  BOOL m_bAlt; pA6A*~QE  
  BOOL m_bShift; QW_BT ^d"  
  CString m_Path; 49YN@ PXC  
  CString m_Number; mJYD"WgY  
  //}}AFX_DATA A_crK`3  
  // ClassWizard generated virtual function overrides E] rBq_S  
  //{{AFX_VIRTUAL(CCaptureDlg) gt\kTn."  
 public: g([M hf#  
  virtual BOOL PreTranslateMessage(MSG* pMsg); AF>t{rw=/  
 protected: w-3Lw<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support &Tg~A9y\  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); AWi+xo|  
  //}}AFX_VIRTUAL Kl<NAv%j  
  // Implementation )KOIf{  
 protected: }i J$&CJ  
  HICON m_hIcon; tV h"C%Vkr  
  // Generated message map functions k"6&&  
  //{{AFX_MSG(CCaptureDlg) R?M>uaxn  
  virtual BOOL OnInitDialog(); L_o/fTz4  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); ""*g\  
  afx_msg void OnPaint(); GP;N1/=  
  afx_msg HCURSOR OnQueryDragIcon(); FH%M5RD  
  virtual void OnCancel(); z\$(@:{A  
  afx_msg void OnAbout(); )y{:Uc\4!  
  afx_msg void OnBrowse(); tG~[E,/`  
  afx_msg void OnChange(); #Hy\l J  
 //}}AFX_MSG <h~=d("j  
 DECLARE_MESSAGE_MAP() / }*}r  
}; u:^sEk"Lk'  
#endif <GF^VT|Ce  
!t}yoN n|  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file wNU;gz  
#include "stdafx.h" j4u ["O3  
#include "Capture.h" | ^G38  
#include "CaptureDlg.h" e;2A{VsD8  
#include <windowsx.h> >`p? CE  
#pragma comment(lib,"hook.lib") /f drf  
#ifdef _DEBUG <W+9 h0c  
#define new DEBUG_NEW AH_qZTv0{Q  
#undef THIS_FILE '8[; m_S  
static char THIS_FILE[] = __FILE__; Tgh?=]H  
#endif -hc8IS  
#define IDM_SHELL WM_USER+1 J 5xMA-  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); }F"98s W  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); P](8Qrl  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _3.rPS,s  
class CAboutDlg : public CDialog nLCaik_,m  
{ UmY{2 nzY  
 public: Ks<+@.DLTu  
  CAboutDlg(); k SgE_W)  
  // Dialog Data lQEsa45  
  //{{AFX_DATA(CAboutDlg) .h\Py[h<^  
  enum { IDD = IDD_ABOUTBOX }; 7D1$cmtH  
  //}}AFX_DATA IR#BSfBZ  
  // ClassWizard generated virtual function overrides c=zSq%e   
  //{{AFX_VIRTUAL(CAboutDlg) !qU1RdZ  
 protected: N9*:]a  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support uP(t+}dQ+3  
  //}}AFX_VIRTUAL IUNr<w<  
  // Implementation CD%Cb53  
 protected: XMdCQ=  
  //{{AFX_MSG(CAboutDlg) .rS. >d^n  
  //}}AFX_MSG r=~K#:66  
  DECLARE_MESSAGE_MAP() E(vO^)#  
}; @BG].UJo  
`WnsM; 1Y"  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) OzwJ 52  
{ \j5`6}zm  
 //{{AFX_DATA_INIT(CAboutDlg) -m@PqJF^  
 //}}AFX_DATA_INIT H:XPl$;  
} [YZgQ  
!0vLSF=  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b`@C#qB  
{ &FuL {YL  
 CDialog::DoDataExchange(pDX); b%vIaP|]B  
 //{{AFX_DATA_MAP(CAboutDlg) Sc/$ 2gSG  
 //}}AFX_DATA_MAP -e_o p'`  
} Js vdC]+  
jU* D  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) j9l32<h7]  
 //{{AFX_MSG_MAP(CAboutDlg) *ra>Kl0   
 // No message handlers vbd)L$$20+  
 //}}AFX_MSG_MAP /'5d0' ,M  
END_MESSAGE_MAP() kD?@nx>  
szb@2fK  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) U|VL+9#hd  
: CDialog(CCaptureDlg::IDD, pParent) JgA{1@h  
{ R PoBF~>  
 //{{AFX_DATA_INIT(CCaptureDlg) j>B*8*Ss  
  m_bControl = FALSE; 0{vH.b @  
  m_bAlt = FALSE; AI Kz]J0;  
  m_bShift = FALSE; |xg_z&dX  
  m_Path = _T("c:\\"); vhAgX0k  
  m_Number = _T("0 picture captured."); a2tEp+7?  
  nCount=0; &0tW{-Hv"  
  bRegistered=FALSE; nj1o!+9>$  
  bTray=FALSE; YB<nz<;JR  
 //}}AFX_DATA_INIT m C`*#[  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Y;%LwDC  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^m&I^ \  
} :8hI3]9  
Rb.vyQ  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 6>oc,=MV/  
{ MIn_?r  
 CDialog::DoDataExchange(pDX); vSC1n8 /  
 //{{AFX_DATA_MAP(CCaptureDlg) \"))P1  
  DDX_Control(pDX, IDC_KEY, m_Key); `GdH ,:S>  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); {Dk!<w I)  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ~J&-~<%P}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ;{L[1OP%e  
  DDX_Text(pDX, IDC_PATH, m_Path); `:*2TLxIk  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4(LLRzzW  
 //}}AFX_DATA_MAP h`dQ OH#  
} Bv!{V)$  
Wbei{3~$Y"  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 8'jt59/f  
//{{AFX_MSG_MAP(CCaptureDlg) ) $b F*  
 ON_WM_SYSCOMMAND() Y0T:%  
 ON_WM_PAINT() af %w|M  
 ON_WM_QUERYDRAGICON() AU}kIm_+  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) VsAJ2g9L  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) d&raHF*  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 5RFro^S9E  
//}}AFX_MSG_MAP Yj/ o17  
END_MESSAGE_MAP() 4=/jh:h  
U|V,&RlbR  
BOOL CCaptureDlg::OnInitDialog() GWWg3z.o"W  
{ Wc2&3p9 c  
 CDialog::OnInitDialog(); ;Vs2 e  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); `Wg"m~l$N  
 ASSERT(IDM_ABOUTBOX < 0xF000); }DS%?6}Sy  
 CMenu* pSysMenu = GetSystemMenu(FALSE); \<*F#3U1  
 if (pSysMenu != NULL) " nCK%w=  
 { boGdZ2$h4  
  CString strAboutMenu; &:&l+  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 2[ofz}k]r)  
  if (!strAboutMenu.IsEmpty()) Z@Zg3AVU  
  { `G1"&q,i  
   pSysMenu->AppendMenu(MF_SEPARATOR); {)lZfj}l  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); v:QUwW  
  } ][jwy-Uy;  
 } Rw{' O]Q*  
 SetIcon(m_hIcon, TRUE); // Set big icon Mf#@8"l  
 SetIcon(m_hIcon, FALSE); // Set small icon Ye&/O<G'V  
 m_Key.SetCurSel(0); N,-C+r5}<4  
 RegisterHotkey(); BInSS*L  
 CMenu* pMenu=GetSystemMenu(FALSE); ?D _4KFr  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); d{JI] !  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Lw,}wM5X  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 6E-eD\?I&  
 return TRUE; // return TRUE unless you set the focus to a control slPr^)  
} j0}wv~\  
+_J@8k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) Awxm[:r>^  
{ ^UJIDg7zS  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) klnNBo!  
 { JI]Lz1i  
  CAboutDlg dlgAbout; lf>d{zd5  
  dlgAbout.DoModal(); GqL&hbpi  
 } 'Xwv,  
 else m`-:j"]b$  
 { Z,2?TT|p  
  CDialog::OnSysCommand(nID, lParam); \Hrcf+`  
 } 8xAIn>,_  
} >8I~i:hn  
]NTQF/   
void CCaptureDlg::OnPaint() ]vz6DJs  
{ Nm z5:Rq  
 if (IsIconic()) [;,E cw^  
 { xIm2t~io  
  CPaintDC dc(this); // device context for painting w/o^OjwQ  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); DCiU?u~  
  // Center icon in client rectangle j[:70%X  
  int cxIcon = GetSystemMetrics(SM_CXICON); V[kJ;YLPN  
  int cyIcon = GetSystemMetrics(SM_CYICON); j[gqS%  
  CRect rect; XLpn3sX$  
  GetClientRect(&rect); }C_g;7*  
  int x = (rect.Width() - cxIcon + 1) / 2; 1gK^x^l*f  
  int y = (rect.Height() - cyIcon + 1) / 2; ^-PYP:*  
  // Draw the icon YU-wE';H6  
  dc.DrawIcon(x, y, m_hIcon); 4N$Wpx  
 } 5A`>3w{3n  
 else 4'#=_J  
 { rhPv{6Z|7  
  CDialog::OnPaint(); ZrEou}z(*  
 } )J@[8 x`  
} Z72%Bv  
u->[ y1JY  
HCURSOR CCaptureDlg::OnQueryDragIcon() )?SFIQ=  
{ T DR|*Cs  
 return (HCURSOR) m_hIcon; 8/R$}b><  
} {ObY1Y`ea  
=p[Sd*d  
void CCaptureDlg::OnCancel() Pzzzv^+  
{ ;q9Y%*  
 if(bTray) #@BhGB`9Qt  
  DeleteIcon(); U9`Co&Z2  
  CDialog::OnCancel(); 81|[Y'f  
} XkqsL0\  
SHPDbBS  
void CCaptureDlg::OnAbout() &?QKWxN  
{ Pl'lmUR  
 CAboutDlg dlg; ]#shuZ##>0  
 dlg.DoModal(); ck `td%  
} \PN*gDmX  
q/*veL  
void CCaptureDlg::OnBrowse() KS5a8'U  
{ aj1g9 y  
 CString str; $ZyOBxI  
 BROWSEINFO bi; |4/rVj"  
 char name[MAX_PATH]; Da[#X`Kp$  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); VSUWX1k4%  
 bi.hwndOwner=GetSafeHwnd(); F# 9^RA)9  
 bi.pszDisplayName=name; e`LvHU_0  
 bi.lpszTitle="Select folder"; E]vox~xK>  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; v\9f 8|K  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); T"H"m4{'  
 if(idl==NULL) NoF|j57?u'  
  return; nvQX)Xf  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); e:MbMj6`  
 str.ReleaseBuffer(); !} x-o`a5  
 m_Path=str; N6BOUU]  
 if(str.GetAt(str.GetLength()-1)!='\\') \ 6taC  
  m_Path+="\\"; X<Xiva85  
 UpdateData(FALSE); ib> ~3s;  
} w ?"M  
*@@dO_%6  
void CCaptureDlg::SaveBmp() I4qS8~+#  
{ )j}#6r  
 CDC dc; WyB^b-QmDh  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); 1)97AkN(O  
 CBitmap bm; |DsT $ ~D  
 int Width=GetSystemMetrics(SM_CXSCREEN); v`Y{.>[H[  
 int Height=GetSystemMetrics(SM_CYSCREEN); {Qd oI Pr3  
 bm.CreateCompatibleBitmap(&dc,Width,Height); k]-Q3 V  
 CDC tdc; \AI-x$5R*  
 tdc.CreateCompatibleDC(&dc); Ke#Rkt  
 CBitmap*pOld=tdc.SelectObject(&bm); M;AvOk|&  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); u!+;Iy7  
 tdc.SelectObject(pOld); I%Z=O=  
 BITMAP btm; 3TV4|&W;  
 bm.GetBitmap(&btm); "85)2*+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; zFYzus`>  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); |G/)<1P  
 BITMAPINFOHEADER bih; ' qT\I8%  
 bih.biBitCount=btm.bmBitsPixel; ZhRdml4U2  
 bih.biClrImportant=0; XCyb[(4  
 bih.biClrUsed=0; P%R9\iajH  
 bih.biCompression=0; :T@} CJ  
 bih.biHeight=btm.bmHeight; &N/dxKZcc  
 bih.biPlanes=1; G|t0no\f  
 bih.biSize=sizeof(BITMAPINFOHEADER); 'vq0Tw5  
 bih.biSizeImage=size; FH%: NO  
 bih.biWidth=btm.bmWidth; q JtLJ<=1  
 bih.biXPelsPerMeter=0; e6 <9`Xg  
 bih.biYPelsPerMeter=0; &Wdi 5T8  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); i&)([C0z$  
 static int filecount=0; m9 c`"!  
 CString name; 2zv:j7  
 name.Format("pict%04d.bmp",filecount++); H|`D3z.c  
 name=m_Path+name; f\RTO63|O  
 BITMAPFILEHEADER bfh; tK#/S+l  
 bfh.bfReserved1=bfh.bfReserved2=0; ?} E M,  
 bfh.bfType=((WORD)('M'<< 8)|'B'); s`v$r,N0  
 bfh.bfSize=54+size; #tw_`yh  
 bfh.bfOffBits=54; k1P'Q&Na  
 CFile bf; pnL[FMc  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ |v#D}E  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +.rOqkxJ  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); _2<UcC~  
  bf.WriteHuge(lpData,size); $i!r> .Jo  
  bf.Close(); sS4V(:3s  
  nCount++; t -}IKrbv  
 } Gv#bd05X  
 GlobalFreePtr(lpData); 2o1WXE %$  
 if(nCount==1) H_| re  
  m_Number.Format("%d picture captured.",nCount); M*Q}^<E*  
 else $n47DW &  
  m_Number.Format("%d pictures captured.",nCount); oe<@mz/  
  UpdateData(FALSE); X(#8EY}X  
} yVKl%GO  
GlC(uhCpV  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) *L Y6hph"  
{ OOABn*  
 if(pMsg -> message == WM_KEYDOWN) eZhF<<Y  
 { B:cQsaty  
  if(pMsg -> wParam == VK_ESCAPE) x]R0zol  
   return TRUE; .SSyW{a3w  
  if(pMsg -> wParam == VK_RETURN) /9Qr1@&v  
   return TRUE; COBjJ3  
 } /3sX>Rj  
 return CDialog::PreTranslateMessage(pMsg); '0o^T 7C  
} =@hCc  
PJ<qqA`!  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 0;OZ|;Z  
{ ~Dw% d;  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ n\BV*AH  
  SaveBmp(); */@I$*  
  return FALSE; :hWG:`  
} 4L97UhLL  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ F~OQ'59!Pf  
 CMenu pop; @`^Z5n.4  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); *mYGs )|  
 CMenu*pMenu=pop.GetSubMenu(0); -Edi"B4K  
 pMenu->SetDefaultItem(ID_EXITICON); Yn?Xo_Y  
 CPoint pt; nYvkeT  
 GetCursorPos(&pt); Lm1JiP s d  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); eIf-7S]m  
 if(id==ID_EXITICON) ,[dvs&-*  
  DeleteIcon(); J*6B~)Sp@  
 else if(id==ID_EXIT) XgeUS;qtta  
  OnCancel(); 7xWJw  
 return FALSE; `fG<iBD  
} w`M`F<_\:  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); RjrQDh|((  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ip*^eS^  
 AddIcon(); 4/ q BD  
 return res; +Oo-8f*  
} +t Prqv"(  
vD/l`Ib:  
void CCaptureDlg::AddIcon() 1g$xKe~]4  
{ j>.1RG  
 NOTIFYICONDATA data; vI48*&]wTf  
 data.cbSize=sizeof(NOTIFYICONDATA); g]BA/Dw  
 CString tip; nT}i&t!q8@  
 tip.LoadString(IDS_ICONTIP); Q{miI N  
 data.hIcon=GetIcon(0); \.P#QVuQ  
 data.hWnd=GetSafeHwnd(); :w4N*lV-  
 strcpy(data.szTip,tip); m?8o\|i,  
 data.uCallbackMessage=IDM_SHELL; ;l < amB  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; *o(bB!q"c  
 data.uID=98; fI=p^k:  
 Shell_NotifyIcon(NIM_ADD,&data); *UG?I|l|I  
 ShowWindow(SW_HIDE); $kkL)O*"]  
 bTray=TRUE; NH=@[t) P,  
} iex]J@=e  
,&* BhUC  
void CCaptureDlg::DeleteIcon() /,$V/q+  
{ 28- z  
 NOTIFYICONDATA data; I,]q;lEMt  
 data.cbSize=sizeof(NOTIFYICONDATA); :RBeq,QaO  
 data.hWnd=GetSafeHwnd();  >Af0S;S  
 data.uID=98; OKu~Nb*  
 Shell_NotifyIcon(NIM_DELETE,&data); R-mn8N&  
 ShowWindow(SW_SHOW); ^i3!1cS  
 SetForegroundWindow(); aJ1{9 5ea  
 ShowWindow(SW_SHOWNORMAL); d+0= a]  
 bTray=FALSE; W58%Zz4a  
} @ @(O##(7  
T5:xia>8O  
void CCaptureDlg::OnChange() 7pnlS*E.  
{ @2_ E9{T  
 RegisterHotkey(); L(1} PZ  
} K]dR%j  
45jImCm  
BOOL CCaptureDlg::RegisterHotkey() :n%&  
{ A#i[Us|  
 UpdateData(); #2Iw%H2q&  
 UCHAR mask=0; aQ&K a  
 UCHAR key=0; U5?QneK  
 if(m_bControl) t23W=U  
  mask|=4; ^L.'At  
 if(m_bAlt) cveQ6 -`K  
  mask|=2; *Aug7 HlS  
 if(m_bShift) p^ OHLT  
  mask|=1; N'pYz0_H  
  key=Key_Table[m_Key.GetCurSel()]; +4[9Eb'k=  
 if(bRegistered){ |fgh ryI,  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); #hXvGon$?  
  bRegistered=FALSE; +u&3pK>f  
 } t/3qD7L  
 cMask=mask; :j/sTO=  
 cKey=key; (>lH=&%zj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); OcC|7s" ,  
 return bRegistered; u6MU @?  
} FNo.#Z5+b  
7$IR^  
  四、小结 8 ~Pdr]5  
)6o%6$c  
  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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