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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: #.) qQ8*(  
  3C.bzw^  
  一、实现方法 HmQuRW  
5?QR  
  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: (zUERw\a X  
YT#" HYO  
#pragma data_seg("shareddata") [_${N,1  
HHOOK hHook =NULL; //钩子句柄 C#(4>'  
UINT nHookCount =0; //挂接的程序数目 V" I+E  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 xAsbP$J:  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Ww@R ewo  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey h4ZrD:D0\  
static int KeyCount =0; 2c}>} A4  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 MA"DP7e?v  
#pragma data_seg() ?(hdV ?8)P  
yay{lP}b"  
  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。 g,9o'fs`x  
J8(v65  
  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: l 4(-yWC$H  
#Ey!?Z  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR EpS"NQEe  
cKey,UCHAR cMask) eFbr1IV  
{ '%kk&&3'  
 BOOL bAdded=FALSE; 4K:p  
 for(int index=0;index<MAX_KEY;index++){ WG< D+P  
  if(hCallWnd[index]==0){ y~;Kf0~  
   hCallWnd[index]=hWnd; s4t>/.;x  
   HotKey[index]=cKey; h@/c76}f6p  
   HotKeyMask[index]=cMask; |UE&M3S  
   bAdded=TRUE; Z&YW9de@  
   KeyCount++; u|APx8?"o  
   break; =3Y?U*d  
  } FjVC&+c  
 } H7*/  
 return bAdded; a+IU<O-J?  
} |no '^  
//删除热键 HBeOK  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <SOC  
{ ;L++H5Kz6  
 BOOL bRemoved=FALSE; Kp8!^os  
 for(int index=0;index<MAX_KEY;index++){ ]uj6-0q){W  
  if(hCallWnd[index]==hWnd){ ho;Km  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ wF[^?K '  
    hCallWnd[index]=NULL; jbGP`b1_  
    HotKey[index]=0; \Ua"gS2L  
    HotKeyMask[index]=0; 4mPCAA7  
    bRemoved=TRUE; (Z;-u+ }.  
    KeyCount--; Q]A;VNx  
    break; 5 J61PuH   
   } Sr/"'w;  
  } D8qZh1w%A|  
 } 5&\Q0SX(~  
 return bRemoved; %jim] ]<S[  
} Fz~-m#Ts  
O8r9&Nv  
w SBDJvI  
  DLL中的钩子函数如下: O\=3{  
5L%A5C&|  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) }LN +V~  
{ ZFY t[:  
 BOOL bProcessed=FALSE; .{*V^[.  
 if(HC_ACTION==nCode) O#uTwnW  
 { H~e;S#3_v  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 C1Slx !}  
   switch(wParam) 3u3(BY{"\F  
   {  `c ^2  
    case VK_MENU: }L3kpw  
     MaskBits&=~ALTBIT; p{[Ol  
     break; *O+G}_}  
    case VK_CONTROL: ,?P@ :S<8  
     MaskBits&=~CTRLBIT; %70sS].@  
     break; inBBU[Sl  
    case VK_SHIFT: D}r,t_]Eb  
     MaskBits&=~SHIFTBIT; 7kp$C?7K  
     break; ]=m '| 0}  
    default: //judge the key and send message 6V KsX+sd  
     break; _ko16wfg  
   } ML^c-xY(  
   for(int index=0;index<MAX_KEY;index++){ ]g2Y/\)a  
    if(hCallWnd[index]==NULL) %XM wjBM  
     continue; FY|.eY_7 {  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) J*vy-[w  
    { mx y>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); zB kS1qMn  
     bProcessed=TRUE; ^F"Q~?D)  
    } u_[s+ J/  
   } {L$]NQdz  
  } :,X,!0pWRp  
  else if((lParam&0xc000ffff)==1){ //有键按下 6hv4D`d;o  
   switch(wParam) W2e~!:w  
   { C: @T5m  
    case VK_MENU: WLma)L`L  
     MaskBits|=ALTBIT; ,A T!:&<X  
     break; 5*l~7R  
    case VK_CONTROL: (,#Rj$W  
     MaskBits|=CTRLBIT; N:[22`NP  
     break; T0J"Wr>WY  
    case VK_SHIFT: !/^i\)j>](  
     MaskBits|=SHIFTBIT; .H {  
     break; FIG3P))  
    default: //judge the key and send message %"Q{|}  
     break; y w)q3zC  
   } fgVeB;k|  
   for(int index=0;index<MAX_KEY;index++){ [#S}L(  
    if(hCallWnd[index]==NULL) U?P5 cN  
     continue; uDJi2,|n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~3< Li}W  
    { #Cks&[!c  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); "E =\Vz  
     bProcessed=TRUE; lS&$86Jo(  
    } -]\cUQ0  
   } (\}>+qS[  
  } c%9wI*l  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 o7' cC?u  
   for(int index=0;index<MAX_KEY;index++){ Rd7Xs  
    if(hCallWnd[index]==NULL) >bWx!M]  
     continue; ?kEcYD  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !VUxy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); AQ:cim `  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 E$"( :%'v  
   } !$P +hX`  
  } P#H|at  
 } t2d _XQOK  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); /^v?Q9=Y  
} RLBjl%Q>  
PYX]ld.E  
  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: >Ng7q?h   
, v,mBYaU  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <8nl}^d5  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); eJFGgJRIvF  
k$1ya7-@  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: H. UwM  
9t:P1  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) a=}JW]  
{ 3#o!K  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) *T\- iICw  
 { 0O+[z9  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 9N5ptdP.d  
  SaveBmp(); 9Ps[i)-  
  return FALSE;  yG -1g0  
 } eq +t%  
 …… //其它处理及默认处理 ug*#rpb  
} T 7`9[  
ov>Rvy  
a'=C/ s+  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 ^{\gD23  
(%*CfR:>  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 e]R`B}vO  
\-3\lZ3qj  
  二、编程步骤 V9 qZa  
ej-x^G?C  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; MN1 kR  
)vVt{g  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; U%oh ?g  
;O` \rP5w  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; <j"}EEb^  
AY{#!RtV  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; NMq#D$T  
C%P)_)- -V  
  5、 添加代码,编译运行程序。 I`Goc!5t  
P{2V@ <}  
三、程序代码 OL+dx`Y  
2D|2/ >[  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 0 ?kaXD  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `;Qw/xl_N  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |tL57Wu93  
#if _MSC_VER > 1000 -WiOs;2~/  
#pragma once =*EIe z*.x  
#endif // _MSC_VER > 1000 nd)Z0%xo  
#ifndef __AFXWIN_H__ rUZRYF4C  
#error include 'stdafx.h' before including this file for PCH # D8Z~U,-  
#endif TS0x8,'$q  
#include "resource.h" // main symbols 0uX"KL]Elf  
class CHookApp : public CWinApp 1n}q6oa=  
{ c32IO&W4  
 public: =2&/Cn4  
  CHookApp(); VxD_:USIF  
  // Overrides C? pi8Xg  
  // ClassWizard generated virtual function overrides +-_71rJc.  
  //{{AFX_VIRTUAL(CHookApp) eZDqW)x  
 public: %jaB>4.A:  
  virtual BOOL InitInstance(); p<>x qU  
  virtual int ExitInstance(); jtqH3xfy  
  //}}AFX_VIRTUAL jIY    
  //{{AFX_MSG(CHookApp) V=yRE  
  // NOTE - the ClassWizard will add and remove member functions here. e.pm`%5bO  
  // DO NOT EDIT what you see in these blocks of generated code ! 1 o<l;:  
  //}}AFX_MSG 0Y rdu,c  
  DECLARE_MESSAGE_MAP() 9=,^^,q  
}; !e~Yp0gX#  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); K:PzR,nn  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Ki#({~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Hg8n`a;R  
BOOL InitHotkey(); 4R_Vi[i  
BOOL UnInit(); %7tQam  
#endif l5sBDiir%  
5~(.:RX:q  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. zJ;K4)"j  
#include "stdafx.h" >:W7f2%8`  
#include "hook.h" a[TR_ uR  
#include <windowsx.h>  LW?Zd=  
#ifdef _DEBUG LxqK@Q<B  
#define new DEBUG_NEW qyXx`'e  
#undef THIS_FILE !'uLV#YEZ  
static char THIS_FILE[] = __FILE__; R Wa4O#  
#endif ^/;W;C{4  
#define MAX_KEY 100 QuuR_Ao?c'  
#define CTRLBIT 0x04 [hy:BV6H+  
#define ALTBIT 0x02 gH87e  
#define SHIFTBIT 0x01 M%=V vE.I  
#pragma data_seg("shareddata") oK3uGPi  
HHOOK hHook =NULL; % :?_N  
UINT nHookCount =0; -[-LR }u  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey |Ad1/>8i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT OkSJob  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey @NBWNgBv  
static int KeyCount =0; *2MM   
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift C+ {du^c$  
#pragma data_seg() *We.?"X'].  
HINSTANCE hins; =GO/r; 4  
void VerifyWindow(); )c9]}:W&  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |12Cg>;j*n  
//{{AFX_MSG_MAP(CHookApp) F\m  
// NOTE - the ClassWizard will add and remove mapping macros here. ^B9rt\,q  
// DO NOT EDIT what you see in these blocks of generated code! XD\RD  
//}}AFX_MSG_MAP +R7";.  
END_MESSAGE_MAP() V>#iR>w_4,  
NwQexYm1_  
CHookApp::CHookApp() c*nH=  
{ BoZ G^  
 // TODO: add construction code here, ]7WBoC8  
 // Place all significant initialization in InitInstance BKoc;20;  
} 1FfdW>ay*  
y w"Tw  
CHookApp theApp; ^{<x*/nK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) w)bLdQ  
{ @\gTi;u/x  
 BOOL bProcessed=FALSE; }qUNXE@  
 if(HC_ACTION==nCode) 6 bL+q`3>  
 { DJl06-s V  
  if((lParam&0xc0000000)==0xc0000000){// Key up `?{Hs+4P5  
   switch(wParam) jRz2l`~7#  
   { c"ukV_6~J  
    case VK_MENU: wv,,#P  
     MaskBits&=~ALTBIT; (]'Q!MjGa  
     break; wK 8/`{B9  
    case VK_CONTROL: Ks&~VU  
     MaskBits&=~CTRLBIT; f.Y9gkt3d  
     break; z-G|EAON"/  
    case VK_SHIFT:  & y1' J  
     MaskBits&=~SHIFTBIT; uM0!,~&9|  
     break; fn|l9k~<O  
    default: //judge the key and send message 2A3;#v  
     break; fgFBOpG%Gq  
   } '"}|'J  
   for(int index=0;index<MAX_KEY;index++){ rI&GM |  
    if(hCallWnd[index]==NULL) VQHJ O I  
     continue; Vv(!Ki}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 7e&R6j  
    { Oq{&hH/'}  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); o{*8l#x8  
     bProcessed=TRUE; dfB#+wh  
    } T:0X-U  
   } %UJ!(_  
  } m{={a5GD  
  else if((lParam&0xc000ffff)==1){ //Key down `Rj<qz^7  
   switch(wParam) STgl{#  
   { Kb0OauW  
    case VK_MENU: &fYx0JT  
     MaskBits|=ALTBIT; SdUtAC2  
     break; *(ex:1sW  
    case VK_CONTROL: -B2>~#L  
     MaskBits|=CTRLBIT; cOUsbxYTD  
     break; L K9vvQz  
    case VK_SHIFT: ] *{QVn(  
     MaskBits|=SHIFTBIT; 8WWRKP1V  
     break; p$}iBk0B(z  
    default: //judge the key and send message -@ #b<"1  
     break; woZ'T  
   } E0=-6j  
   for(int index=0;index<MAX_KEY;index++) 6w K=  
   { 7Z>u|L($m  
    if(hCallWnd[index]==NULL) GCrh4rxgg  
     continue; XgKtg-,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 9bjjo;A  
    { Uq)|]a&e  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 3+m#v8h1  
     bProcessed=TRUE; &0TOJ:RP  
    } "}D uAs  
   } JGIN<J85e  
  } pTZPOv#?Q  
  if(!bProcessed){ 0CY_nn#3  
   for(int index=0;index<MAX_KEY;index++){ 1?HUXN#,  
    if(hCallWnd[index]==NULL) eif<aG5  
     continue; aPB %6c=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) o_U=]mEDY  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); TQK>w'L  
   } b@N|sXt&C  
  } NTiJEzW}  
 } '6{q;Bxo  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); }M f}gCEW  
} I"3Qdi  
?)Lktn9%  
BOOL InitHotkey() H;s0|KRgJ  
{ ]M{SM`Ya  
 if(hHook!=NULL){ }Evyfc#D  
  nHookCount++; ltt%X].[  
  return TRUE; >82Q!HaH  
 } E?&dZR  
 else TEB%y9  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 3P/T`)V  
  if(hHook!=NULL) r4NI(\gU  
   nHookCount++; %'`Dd  
  return (hHook!=NULL); HhNH"b&  
} oypq3V=5  
BOOL UnInit() ^`YSl*:  
{ HeGGAjc  
 if(nHookCount>1){ m&,d8Gss^  
  nHookCount--; xpFu$2T6P.  
  return TRUE; 1SkGG0 W  
 } 4cJ^L <  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 7* ^\mycv  
 if(unhooked==TRUE){ ix^:qw;  
  nHookCount=0; yqlkf$?  
  hHook=NULL; 0"u*Kn  
 } qChS} Q  
 return unhooked;  'm}~  
} xm~ff+(&@S  
B/E1nBobC  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) D8h ?s  
{ e kI1j%fO  
 BOOL bAdded=FALSE; `]WU=Ss  
 for(int index=0;index<MAX_KEY;index++){ UOF5&>MLb  
  if(hCallWnd[index]==0){ S~YrXQ{_>-  
   hCallWnd[index]=hWnd;  2b1LC!'U  
   HotKey[index]=cKey; ;#/b=j\pi  
   HotKeyMask[index]=cMask; O:r<es1  
   bAdded=TRUE; 2K, 1wqf'  
   KeyCount++; UN| "D]>/  
   break; ]ZO^@sH  
  } &z{oVU+mA  
 } g_>)Q  
 return bAdded; LLgN%!&  
} ,0<|&D  
BEPDyy  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) GOH@|2N  
{ S?hM  
 BOOL bRemoved=FALSE; kp<9o!?)  
 for(int index=0;index<MAX_KEY;index++){ (U!WD`Ym  
  if(hCallWnd[index]==hWnd){ HtY\!_Ea  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ bvEk.~tC'  
    hCallWnd[index]=NULL; \C}tK,79  
    HotKey[index]=0; ; {I{X}b  
    HotKeyMask[index]=0; QwOQS %  
    bRemoved=TRUE; g IX"W;  
    KeyCount--; 3dadeu^{A  
    break; iv#9{T  
   } ^fnRzX  
  } n{Jvx>);  
 } 6xnJyEQUM  
 return bRemoved; 3zWY%(8t4?  
} _sZ/tU@_-K  
F1Egcx/$V  
void VerifyWindow() H W.S~eLw*  
{ +t.T+` EG  
 for(int i=0;i<MAX_KEY;i++){ 56?U4wj7{  
  if(hCallWnd!=NULL){ _3A$z A  
   if(!IsWindow(hCallWnd)){ $C#~c1w  
    hCallWnd=NULL; %PlPXoG=  
    HotKey=0; ^N Et{]x  
    HotKeyMask=0; jGI!}4_  
    KeyCount--; Wf: AMxDm  
   } XZp(Po:H  
  } An]*J|nFIY  
 } W'gCFX  
} Duptles  
N@Slc 0  
BOOL CHookApp::InitInstance() Q:_pW<^  
{ RG*Nw6A  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 3w{ i5gGn  
 hins=AfxGetInstanceHandle(); wZfR>|f  
 InitHotkey(); .vpQ3m>  
 return CWinApp::InitInstance(); Qg9{<0{u  
} _?q\tyf3  
zKfb  
int CHookApp::ExitInstance() C6'[Tn  
{ > )#*}JI  
 VerifyWindow(); |C>Yd*E,C  
 UnInit(); H7qda' %>  
 return CWinApp::ExitInstance(); MlRgdVX  
} ;HqK^[1\  
V3@^bc!   
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file [>"qOFCr#:  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) &k1Ez  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ )- 2^Jvc  
#if _MSC_VER > 1000 IHxX:a/iv  
#pragma once 9SAyU%mS:  
#endif // _MSC_VER > 1000 Pq7YJ"Z?:  
LgUaX  
class CCaptureDlg : public CDialog +hXph  
{ ZV;#ZXch  
 // Construction 'Iu$4xo`[  
 public: Ypv"u0  
  BOOL bTray; /-BplU*"9  
  BOOL bRegistered; T w"^I*B  
  BOOL RegisterHotkey(); *"9b?`E  
  UCHAR cKey; m?<C\&)6x  
  UCHAR cMask; 0JNG\ARC  
  void DeleteIcon(); aK1|b=gVj  
  void AddIcon(); Lk3@E u)  
  UINT nCount; 7z%zXDe~T[  
  void SaveBmp();  ZfvFs  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor v`Sllv5bV  
  // Dialog Data ?]3`WJOj  
  //{{AFX_DATA(CCaptureDlg) I"@5=m5  
  enum { IDD = IDD_CAPTURE_DIALOG }; KY|Q#i|pM  
  CComboBox m_Key; O^:Rm=,$  
  BOOL m_bControl; d(To)ly.  
  BOOL m_bAlt; ,HMB`vF  
  BOOL m_bShift; (5G^"Srw  
  CString m_Path; %f{kT<XHu  
  CString m_Number; L}:u9$w  
  //}}AFX_DATA <'GI<Hc  
  // ClassWizard generated virtual function overrides 7~|o_T  
  //{{AFX_VIRTUAL(CCaptureDlg) CH9#<?l  
 public: Q'Q+mt8u5  
  virtual BOOL PreTranslateMessage(MSG* pMsg); |n6nRE wW  
 protected: S4?ss I  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +(|T\%$DT  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 7J>n;8{%?  
  //}}AFX_VIRTUAL lZ_i~;u4@v  
  // Implementation 1YM04*H  
 protected: CiPD+I  
  HICON m_hIcon; dnNc,l&g  
  // Generated message map functions E}1[&  
  //{{AFX_MSG(CCaptureDlg) y!aq}YS  
  virtual BOOL OnInitDialog(); 3s>& h-E  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); {SROg;vA  
  afx_msg void OnPaint(); pOS.`rSK  
  afx_msg HCURSOR OnQueryDragIcon(); `7N[rs9|S  
  virtual void OnCancel(); C@Wm+E~;8  
  afx_msg void OnAbout(); ~Dkje  
  afx_msg void OnBrowse(); Ko -<4wu  
  afx_msg void OnChange(); urog.Q  
 //}}AFX_MSG 9IIe:  
 DECLARE_MESSAGE_MAP() @p `#y  
}; TR: D  
#endif 9B*SWWAj  
{kZhje^$vi  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file i[jAAr$  
#include "stdafx.h" 0c:CA>F  
#include "Capture.h" gL}K84T$S  
#include "CaptureDlg.h" NO9Jre  
#include <windowsx.h> ;o8cfD.z  
#pragma comment(lib,"hook.lib") &:{| nDT_2  
#ifdef _DEBUG M%B]f2C  
#define new DEBUG_NEW ]Fj z+CGg  
#undef THIS_FILE NrL%]dl3/  
static char THIS_FILE[] = __FILE__; 1~5={eI  
#endif k`TEA?RfQ  
#define IDM_SHELL WM_USER+1 y l3iU:+V  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); \ =83#*KK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); y4envjl 0  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; dmE-W S  
class CAboutDlg : public CDialog uO BpMAJ  
{ yil{RfBEr_  
 public: ICV67(Ui  
  CAboutDlg(); !-\*rdE {9  
  // Dialog Data <y`yKXzBUV  
  //{{AFX_DATA(CAboutDlg) T8qG9)~3  
  enum { IDD = IDD_ABOUTBOX }; q:nYUW o   
  //}}AFX_DATA |4-Ey! P  
  // ClassWizard generated virtual function overrides m0\(a_0V  
  //{{AFX_VIRTUAL(CAboutDlg) qe\j$Cjy  
 protected: VMtR4!:q  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 1S_ KX.  
  //}}AFX_VIRTUAL x28Bz*O  
  // Implementation l}<s~ip  
 protected: N 4,w  
  //{{AFX_MSG(CAboutDlg) (>)Y0ki}  
  //}}AFX_MSG fh,Y#.V`  
  DECLARE_MESSAGE_MAP() B`KpaE]  
}; y0=BL  
R\X=Vg  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Dy8Go4  
{ :Eob"WH  
 //{{AFX_DATA_INIT(CAboutDlg) TJO|{Lxm  
 //}}AFX_DATA_INIT -G*u2i_*  
} <vbk@d  
%*r P d>*  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) )ns;S  
{ z2,rnm)Q  
 CDialog::DoDataExchange(pDX); 0e/~H^,SQ  
 //{{AFX_DATA_MAP(CAboutDlg) }*0%wP  
 //}}AFX_DATA_MAP :!aFfb["  
} g\6(ezUF*  
*!nS4 [d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) {O!fV<Vx 9  
 //{{AFX_MSG_MAP(CAboutDlg) K$K[fcj  
 // No message handlers s!UC{)g,  
 //}}AFX_MSG_MAP dn5T7a~   
END_MESSAGE_MAP() (r7~ccy4  
U;{VL!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) -pLb%f0?  
: CDialog(CCaptureDlg::IDD, pParent) 9K%E+_7b  
{ ]n!pn#Q  
 //{{AFX_DATA_INIT(CCaptureDlg) 1zl@$ Nt  
  m_bControl = FALSE; ,@>B#%Nz  
  m_bAlt = FALSE; 5a_K|(~3I  
  m_bShift = FALSE; qnT:x{o  
  m_Path = _T("c:\\"); NP|U |zn  
  m_Number = _T("0 picture captured."); 4#=^YuKaF1  
  nCount=0; G.(9I~!  
  bRegistered=FALSE; 0 J ANj  
  bTray=FALSE; 'RG`DzuF  
 //}}AFX_DATA_INIT 3 #jPQ[+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z{AfR2L  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 5@Rf]'1B0  
} 8BWLi5R[  
XSZW9/I-(|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) \WZ00Y,*  
{ p%,JWZ[  
 CDialog::DoDataExchange(pDX); Ak4iG2  
 //{{AFX_DATA_MAP(CCaptureDlg) Fv(zql  
  DDX_Control(pDX, IDC_KEY, m_Key); _<5> E  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 7] ~'8  
  DDX_Check(pDX, IDC_ALT, m_bAlt); B%r)~?6DM  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); BeplS  
  DDX_Text(pDX, IDC_PATH, m_Path); >\VZ9bP<   
  DDX_Text(pDX, IDC_NUMBER, m_Number); 2"%d!"  
 //}}AFX_DATA_MAP H,zRmK6A%  
} Bv/v4(G5g  
Yz{UP)TC  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) D4 e)v%  
//{{AFX_MSG_MAP(CCaptureDlg) d)q{s(<;  
 ON_WM_SYSCOMMAND() |E!xt6B  
 ON_WM_PAINT() "*TnkFTR  
 ON_WM_QUERYDRAGICON() k.0$~juu  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) |n* I}w^  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1k "*@Z<  
 ON_BN_CLICKED(ID_CHANGE, OnChange) GKm)wOb(*S  
//}}AFX_MSG_MAP R#Ss_y  
END_MESSAGE_MAP() :a`l_RMU  
jQ`cfE$sV  
BOOL CCaptureDlg::OnInitDialog() gKBcD\F  
{ QvqX3FU  
 CDialog::OnInitDialog(); K4oLb"gB1  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); c)lMi}/  
 ASSERT(IDM_ABOUTBOX < 0xF000); *y.KD4@{  
 CMenu* pSysMenu = GetSystemMenu(FALSE); %Wu3$b  
 if (pSysMenu != NULL) $L;7SY?  
 { 5w{_WR6,  
  CString strAboutMenu; 3D%I=p(  
  strAboutMenu.LoadString(IDS_ABOUTBOX);  E#ti  
  if (!strAboutMenu.IsEmpty()) +}*]9nG  
  { h!MZ 6}zb)  
   pSysMenu->AppendMenu(MF_SEPARATOR); NlWIb2,  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); lgre@M]mg  
  } 6kYn5:BhIi  
 } {wCQ#V  
 SetIcon(m_hIcon, TRUE); // Set big icon ?$8OVq.w,  
 SetIcon(m_hIcon, FALSE); // Set small icon @YV-8;hO  
 m_Key.SetCurSel(0); ].` i`.T  
 RegisterHotkey(); }0qgvw  
 CMenu* pMenu=GetSystemMenu(FALSE); p6I@o7f  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); "EhA _ =i  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); +FyG{1?<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); oXb}6YC  
 return TRUE; // return TRUE unless you set the focus to a control 7pr@aA"vgj  
} B ljZ&wZW  
3kQky  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) XCQ =`3f  
{ }6ec2I%`o  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) #@ lLx?U  
 { bIwt#:v  
  CAboutDlg dlgAbout; ,zz+s[ZH7O  
  dlgAbout.DoModal(); Smg,1,=  
 } q=g;TAXZl  
 else \%rX~UhZ=  
 { o3j4XrK  
  CDialog::OnSysCommand(nID, lParam); 1 ^Ci$ra  
 } =][[TH  
} ;/ WtO2  
o{nBtxZ"  
void CCaptureDlg::OnPaint() :\gdQG  
{ JtvAi\52$  
 if (IsIconic()) dsrzXmE0  
 { g$ 9Yfu  
  CPaintDC dc(this); // device context for painting JKXs/r;:  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); qp'HRh@P2:  
  // Center icon in client rectangle $)z(4Ev  
  int cxIcon = GetSystemMetrics(SM_CXICON); s#64NG  
  int cyIcon = GetSystemMetrics(SM_CYICON); beN0 ?G  
  CRect rect; H8rDG/>^  
  GetClientRect(&rect); Ws.F=kS>h  
  int x = (rect.Width() - cxIcon + 1) / 2; ~ B1)!5Z  
  int y = (rect.Height() - cyIcon + 1) / 2; D+#QQH  
  // Draw the icon 4GeWo@8h  
  dc.DrawIcon(x, y, m_hIcon); ;1K.SDj  
 } ->$Do$  
 else ^Jsx^?  
 { 2["bS++?  
  CDialog::OnPaint(); 9xN4\y6F  
 } Fdzs Wm  
} l]^uVOX  
E<D45C{DP  
HCURSOR CCaptureDlg::OnQueryDragIcon() >t3%-Kc  
{ S 0,p:Wey  
 return (HCURSOR) m_hIcon; b&s"x? 7  
} Q4}2-}|  
ebp18_a|  
void CCaptureDlg::OnCancel() j^mAJ5  
{ g]N!_Ib/!  
 if(bTray) vRYfB{~  
  DeleteIcon(); ~UEft  
  CDialog::OnCancel(); Nz\=M|@(#  
} ?tV$o,11  
UuzT*Y>  
void CCaptureDlg::OnAbout() 3g^_Fq'  
{ %9uLxC;  
 CAboutDlg dlg; 7[.aAGTZ;  
 dlg.DoModal(); MCjf$pZN]  
} <TC\Nb$~  
&X }GJLC3  
void CCaptureDlg::OnBrowse() <`+U B<K  
{ )zf&`T  
 CString str; Qis[j-?:  
 BROWSEINFO bi; ^fQ ]>/u  
 char name[MAX_PATH]; _>S."cm}!k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); pmv;M`_|R  
 bi.hwndOwner=GetSafeHwnd(); :Fm;0R@/k  
 bi.pszDisplayName=name; z~# .Ey  
 bi.lpszTitle="Select folder"; +pkX$yz  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; QcU&G*   
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); XcAx@CY9c  
 if(idl==NULL) XFUlV;ek  
  return; 6f v{?0|  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); "6[fqW65  
 str.ReleaseBuffer(); m+?$cyA>v  
 m_Path=str; Y1h8O%?  
 if(str.GetAt(str.GetLength()-1)!='\\') @6~r7/WD  
  m_Path+="\\"; /2Y t\=S=  
 UpdateData(FALSE); LK-2e$1  
} I'Ui` :A  
G0Eqo$W)S  
void CCaptureDlg::SaveBmp() W]}y:_t4  
{ ifHQ2Ug 9  
 CDC dc; xKi: 2  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); d %1j4JE{  
 CBitmap bm; f!|7j}3  
 int Width=GetSystemMetrics(SM_CXSCREEN); ds}:t.3}6  
 int Height=GetSystemMetrics(SM_CYSCREEN); ]+u`E  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ,9SBGxK5`  
 CDC tdc; | :7O  
 tdc.CreateCompatibleDC(&dc); ]+@@{?0  
 CBitmap*pOld=tdc.SelectObject(&bm); (P%{Tab  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); _lcx?IV  
 tdc.SelectObject(pOld); AqM}@2#%%  
 BITMAP btm; }1kT0*'L  
 bm.GetBitmap(&btm); Q`j!$r  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; >> yK_yg  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); jNd."[IrO  
 BITMAPINFOHEADER bih; nd_+g2x'  
 bih.biBitCount=btm.bmBitsPixel; \qj4v^\  
 bih.biClrImportant=0; ixm-wZI  
 bih.biClrUsed=0; /@h)IuW  
 bih.biCompression=0; efW<  
 bih.biHeight=btm.bmHeight; $Y& 8@/L  
 bih.biPlanes=1; J$Uj@M  
 bih.biSize=sizeof(BITMAPINFOHEADER); l6] :Zcd0  
 bih.biSizeImage=size; l.[S.@\=.  
 bih.biWidth=btm.bmWidth; >1q W*  
 bih.biXPelsPerMeter=0; o/??w:'  
 bih.biYPelsPerMeter=0; C^oj/} ^  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); OMgFp|^  
 static int filecount=0; 0&XdCoIe  
 CString name; }TfZ7~o[  
 name.Format("pict%04d.bmp",filecount++); X` r~cc  
 name=m_Path+name; olda't  
 BITMAPFILEHEADER bfh; Wwo'pke  
 bfh.bfReserved1=bfh.bfReserved2=0; >|Yr14?7  
 bfh.bfType=((WORD)('M'<< 8)|'B'); @#m@ .   
 bfh.bfSize=54+size; W/e6O??O  
 bfh.bfOffBits=54; 2%o@?Rp  
 CFile bf; h \dq]yOl  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 36iDiT_  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); onqfmQ,3E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); as%@dUK?  
  bf.WriteHuge(lpData,size); Vcjmj  
  bf.Close(); Y=0D[o8  
  nCount++; #2 Gy=GvV  
 } TC[(mf:8  
 GlobalFreePtr(lpData); O\0]o!  
 if(nCount==1) &q8oalh  
  m_Number.Format("%d picture captured.",nCount); sKD sps^$  
 else dA4DW  
  m_Number.Format("%d pictures captured.",nCount); ?D[9-K4Vn  
  UpdateData(FALSE); Lh`B5  
} \MhSIlM#  
1j4tR#L  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) re}_+sv U  
{ AIN Fv;  
 if(pMsg -> message == WM_KEYDOWN) 8);G'7O  
 { T'C^,,if  
  if(pMsg -> wParam == VK_ESCAPE) 'Z ;8-1M?O  
   return TRUE; }[2  
  if(pMsg -> wParam == VK_RETURN) #7(?B{i  
   return TRUE; "wqN,}bj\  
 } _TLB1T^/4  
 return CDialog::PreTranslateMessage(pMsg); 0o-. m  
} u_31Db<  
=*2_B~`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) gs/ i%O  
{ Vd%%lv{v  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ KAkD" (!  
  SaveBmp(); ou V%*<Ki  
  return FALSE; I!-"SuBy4J  
} 4 q-/R  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ kz30! L  
 CMenu pop; k{Ad(S4J&  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "|k 4<"]  
 CMenu*pMenu=pop.GetSubMenu(0); cJ^{iOQ+  
 pMenu->SetDefaultItem(ID_EXITICON); cpLlkR O  
 CPoint pt; ."X}A t  
 GetCursorPos(&pt); yq7gBkS  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); GycW3tc]_&  
 if(id==ID_EXITICON) l4O&*,}l##  
  DeleteIcon(); U=ek_FO  
 else if(id==ID_EXIT) "/ 9EUbca  
  OnCancel(); Po B-:G6  
 return FALSE; 'GyO  
} PAYS~MnV@3  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 2oBT _o%/J  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a%g|E'\Jw  
 AddIcon(); .Tm m  
 return res; t@"i/@8x$  
} Nv[MU@Tv  
[uLwr$N<%L  
void CCaptureDlg::AddIcon() HP,sNiw  
{ IoAG!cS  
 NOTIFYICONDATA data; mG\$W#+j  
 data.cbSize=sizeof(NOTIFYICONDATA); a*kvU"]  
 CString tip; `>1XL2  
 tip.LoadString(IDS_ICONTIP); > a?K ![R  
 data.hIcon=GetIcon(0); y]U]b G{  
 data.hWnd=GetSafeHwnd(); dilom#2l  
 strcpy(data.szTip,tip); fV(WUN+  
 data.uCallbackMessage=IDM_SHELL; ](@HPAG]  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; kN~:Bh$  
 data.uID=98; d}:eLC  
 Shell_NotifyIcon(NIM_ADD,&data); |^09ny|  
 ShowWindow(SW_HIDE); '73g~T%$^*  
 bTray=TRUE; {r>iUgg  
} j0wpaIp  
)hy(0 D  
void CCaptureDlg::DeleteIcon() L ^E#"f  
{ QKB*N)%6  
 NOTIFYICONDATA data; T1~G {@"  
 data.cbSize=sizeof(NOTIFYICONDATA); _uf,7R-  
 data.hWnd=GetSafeHwnd(); gJFx#s0?6.  
 data.uID=98; zBjtPtiiI8  
 Shell_NotifyIcon(NIM_DELETE,&data); _TbQjE&6  
 ShowWindow(SW_SHOW); sF4+(9=  
 SetForegroundWindow(); RW4,j&)  
 ShowWindow(SW_SHOWNORMAL); UFSbu5 j  
 bTray=FALSE; uB@~xQ_V  
} `qs[a}%'>"  
&# < M o  
void CCaptureDlg::OnChange() +x(~!33[G  
{ ;Pw\p^wz  
 RegisterHotkey(); $p;<1+!  
} ud grZ/w]  
V<A$eb>6  
BOOL CCaptureDlg::RegisterHotkey() *}h#'+  
{ Q94Lq~?YF  
 UpdateData(); $*')Sma  
 UCHAR mask=0; uB1>.Pvxb  
 UCHAR key=0; k[Ue}L|  
 if(m_bControl) y>! 8mDvZ  
  mask|=4; _c$F?9:  
 if(m_bAlt) E#zLm  
  mask|=2; eHl)/='  
 if(m_bShift) FGey%:p9$  
  mask|=1; MBn ZO  
  key=Key_Table[m_Key.GetCurSel()]; xg;I::hE7X  
 if(bRegistered){ rNN ,!  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3YO %$  
  bRegistered=FALSE; ZBuh(be  
 } :9~LYJ ?  
 cMask=mask; 4.e0k<]N`  
 cKey=key; =THRy ZCH  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);   -]. a0  
 return bRegistered; Dbg,|UH  
} v$)ZoM6E  
M/a40uK  
  四、小结 !)4'[5t"U  
IQ\5!e  
  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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