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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: %)BwE  
  i5.?g<.H  
  一、实现方法 .4H_Zt[2  
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  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: W+8BQ- 2  
u)tHOV>&  
#pragma data_seg("shareddata") N[0 xqQ  
HHOOK hHook =NULL; //钩子句柄 T"n>h  
UINT nHookCount =0; //挂接的程序数目 TNyK@~#m  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 f#'8"ff*1  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 AGl|>f)  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey v&p,Clt-2  
static int KeyCount =0; kw 6cFz  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 o lYPlH F  
#pragma data_seg() "kcpA#uD|  
6e-#XCR{  
  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。 $dlnmNP+  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: ov?.:M  
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BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +R2^* *<  
cKey,UCHAR cMask) a];BW)  
{ I~d#p ]>  
 BOOL bAdded=FALSE; F9Ifw><XM  
 for(int index=0;index<MAX_KEY;index++){ 's$A+8;L  
  if(hCallWnd[index]==0){ NE$VeW+@  
   hCallWnd[index]=hWnd; #=`FM:WH  
   HotKey[index]=cKey; ' 9IP;  
   HotKeyMask[index]=cMask; ~!8%_J_  
   bAdded=TRUE; n^* >a  
   KeyCount++; @*CAn(@#N  
   break; >r;ABz/  
  } R#"U/8b>z  
 } xIS\4]F?r  
 return bAdded; gV<0Hj  
} @PT`CK}  
//删除热键 qgwv=5|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "V*kOb&'*Z  
{ 8|w5QvCU?3  
 BOOL bRemoved=FALSE; jz{(q;  
 for(int index=0;index<MAX_KEY;index++){ xP8iz?6"V  
  if(hCallWnd[index]==hWnd){ (:_%kmu  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ybD{4&ZE  
    hCallWnd[index]=NULL; l4iuu  
    HotKey[index]=0; )$ ofl%+  
    HotKeyMask[index]=0; aEcktg6h  
    bRemoved=TRUE; >&$$(Bp  
    KeyCount--; mgJShn8]  
    break; *Gg1h@&  
   } di-O*ug  
  } Aivu%}_|  
 } *Te4U5F  
 return bRemoved; 6Y;Y}E  
} S 23S.]r  
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=giM@MV  
  DLL中的钩子函数如下: /Oq1q._9F  
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LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 1$:{{%  
{ XX]5T`D  
 BOOL bProcessed=FALSE; DePV,.  
 if(HC_ACTION==nCode) MILIu;[{#r  
 { z5x ,fQw6O  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 AzHIp^  
   switch(wParam) P`\m9"7  
   {  S/@dkHI'  
    case VK_MENU: B'G*y2UnG  
     MaskBits&=~ALTBIT; /2g)Z!&+L  
     break; %k/ k]: s  
    case VK_CONTROL: iYO wB'z  
     MaskBits&=~CTRLBIT; (t]lP/  
     break; L eG7x7n  
    case VK_SHIFT: r[.zLXgK  
     MaskBits&=~SHIFTBIT; N oX_?  
     break; o7_MMeQ4  
    default: //judge the key and send message J{nyo1A  
     break; Nb^zkg  
   } Rz<d%C;R  
   for(int index=0;index<MAX_KEY;index++){ A2g"=x[1@K  
    if(hCallWnd[index]==NULL) }XfS#Xr1aV  
     continue; o9U0kI=W  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) GN htnB  
    { 6MLN>)t  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 6 . +[ z  
     bProcessed=TRUE; 2+T8Y,g  
    } n:5O9,umZ  
   } $\YLmG  
  } E3CiZ4=5  
  else if((lParam&0xc000ffff)==1){ //有键按下 "TBQNWZ  
   switch(wParam) iF#}t(CrH  
   { &rl]$Mtt  
    case VK_MENU: E1Ru)k{B  
     MaskBits|=ALTBIT; uPv;y!Lsa@  
     break; >wg9YZ~8  
    case VK_CONTROL: }@ O|RkY  
     MaskBits|=CTRLBIT; O84v*=uA  
     break; !1a|5 xrn  
    case VK_SHIFT: &;6|nl9;  
     MaskBits|=SHIFTBIT; |d/x~t=  
     break; *j_fG$10g  
    default: //judge the key and send message 2FZ 0c/[&  
     break; z:ru68  
   } egxJ3.  
   for(int index=0;index<MAX_KEY;index++){ )Dk0V!%N  
    if(hCallWnd[index]==NULL) cXLV"d  
     continue; %!ER@&1f&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) (n":] 8}  
    { WuP([8  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); X/`#5<x  
     bProcessed=TRUE; :/yr(V{  
    } a'_MhJzs  
   } \p>]G[g  
  } Y^c,mK^  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 X]JpS  
   for(int index=0;index<MAX_KEY;index++){ C0t+Q  
    if(hCallWnd[index]==NULL) ,E*a$cCw  
     continue; ? RR Srr1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) e6{[o@aM{  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \J,- <wF  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 xY\*L:TwW  
   } DJ mQZ+{2  
  } (PsSE:r}+  
 } RB lOTQjv  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 0_,3/EWa  
} !_XU^A>  
 \pewbu5^  
  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: #FQm/Q<0  
)5GdvqA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); hSx+ {4PZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $+lz<~R  
6yu*a_  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: )F%wwc^r  
D_yY0rRM  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)  :kp  
{ UALg!M#  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) &m%Pr  
 { PNxVW  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 6uCk0 B|  
  SaveBmp(); Kbz7  
  return FALSE; 8CnI%_Su  
 } -KIVnV=&m  
 …… //其它处理及默认处理 A<YZBR_  
} U2[3S\@  
(jo(bbpj  
86^ZYh  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 l# !@{ <  
j?f,~Y<k  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 g6@NPQ  
^O$[Y9~*  
  二、编程步骤 +]S;U&vQ  
H4y1Hpa,  
  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"; So)KI_M  
(v'lb!j^#  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; _Y ><ih  
0'\FrG  
  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; k@t,[  
G3_mWppH  
  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; YA;8uMqh;  
XD+cs.{5  
  5、 添加代码,编译运行程序。 CQ8o9A/  
U&w 5&W{F}  
三、程序代码 j quSR=  
w}bEufU+2  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL +}(B856+  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) $^NWzc  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ WfTdD.Xx  
#if _MSC_VER > 1000 uG(~m_7Hx  
#pragma once ,syA()  
#endif // _MSC_VER > 1000 rd"]@ ~v1  
#ifndef __AFXWIN_H__ F;MT4*4  
#error include 'stdafx.h' before including this file for PCH <_sT]?N #  
#endif cP#]n)<  
#include "resource.h" // main symbols 8Snq75Q<   
class CHookApp : public CWinApp )HzITsFZKT  
{ ek{PA!9Sk  
 public: #o r7T^  
  CHookApp(); ,$6MM6W;-F  
  // Overrides ~\)&{ '  
  // ClassWizard generated virtual function overrides d'AviW>  
  //{{AFX_VIRTUAL(CHookApp) E9Xk8w'+  
 public: /_k hFw  
  virtual BOOL InitInstance(); ,],JI|Rl8c  
  virtual int ExitInstance(); kXZV%mnT7  
  //}}AFX_VIRTUAL UB&S 2g  
  //{{AFX_MSG(CHookApp) L yA(.  
  // NOTE - the ClassWizard will add and remove member functions here. e\ l,gQP  
  // DO NOT EDIT what you see in these blocks of generated code ! S)'q:`tZo  
  //}}AFX_MSG O 44IH`SI  
  DECLARE_MESSAGE_MAP() e}Af"LI  
}; vZ nO  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); H8t{ >C)]  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); <E}]t,'3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '9p5UC  
BOOL InitHotkey(); mk`cyN>m  
BOOL UnInit(); 9Pob|UA  
#endif a5U2[Ko80  
bF Y)o Z  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. kkE)zF   
#include "stdafx.h" $NGtxZp  
#include "hook.h" bhm~Ii  
#include <windowsx.h> $jeDVH  
#ifdef _DEBUG (fGJP*YO  
#define new DEBUG_NEW SVs~,  
#undef THIS_FILE xwH|ryfs,Z  
static char THIS_FILE[] = __FILE__; 6dS1\Y  
#endif Znh uIA AG  
#define MAX_KEY 100 KEVy%AP=*h  
#define CTRLBIT 0x04 rd 35)  
#define ALTBIT 0x02 F{H0 %  
#define SHIFTBIT 0x01 f\F_?s)_y  
#pragma data_seg("shareddata") ?9r,Y;,H  
HHOOK hHook =NULL; G}dOx}kT  
UINT nHookCount =0; Lq $4.l[j  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 2W:?#h3  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }b ]y 0"  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey kJ<Xq   
static int KeyCount =0; f/[?5M[  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ;AL@<,8  
#pragma data_seg() tCCi|*P G  
HINSTANCE hins; U9p.Dh~)vG  
void VerifyWindow(); x{`<);CQ  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) |7Xpb  
//{{AFX_MSG_MAP(CHookApp) u FYQ^  
// NOTE - the ClassWizard will add and remove mapping macros here. #<i> <EG  
// DO NOT EDIT what you see in these blocks of generated code! .McoW7|Y  
//}}AFX_MSG_MAP Lc:SqF  
END_MESSAGE_MAP() p:Ld)U*  
=|5bhwU]  
CHookApp::CHookApp() |3T|F3uEX  
{ pffw5Tc  
 // TODO: add construction code here, Z Lio8  
 // Place all significant initialization in InitInstance MoR-8vnJ  
} _M]rH<h  
f_P+qm  
CHookApp theApp; Oi%~8J>  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) @~U6=(+  
{ |8U7C\S[  
 BOOL bProcessed=FALSE; Hv7D+ j8M  
 if(HC_ACTION==nCode) }Keon.N?   
 { >RqT7n8h  
  if((lParam&0xc0000000)==0xc0000000){// Key up y:[VRLo  
   switch(wParam) I^\bS  
   { bb :|1D  
    case VK_MENU: nIqY}??  
     MaskBits&=~ALTBIT; ttq< )4  
     break; -^xKG'uth  
    case VK_CONTROL: J!fc)h  
     MaskBits&=~CTRLBIT; =#")G1A  
     break; 19-yM`O  
    case VK_SHIFT: &Cpxo9-  
     MaskBits&=~SHIFTBIT; *DI:MBJY  
     break; }!7DF  
    default: //judge the key and send message RdVis|7o  
     break; K\E]X\:  
   } 4C9"Q,o%&  
   for(int index=0;index<MAX_KEY;index++){ R6@~   
    if(hCallWnd[index]==NULL) a~eLkWnh<k  
     continue; }}bi#G:R+  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) b= ec?n #7  
    { :2Rci`lp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8J?`_  
     bProcessed=TRUE; X-r,>o:  
    } !#4HGjPI  
   } kR~4O$riG  
  } mF:s-+  
  else if((lParam&0xc000ffff)==1){ //Key down ABe^]HlH  
   switch(wParam) !2M[  
   { 2c`=S5  
    case VK_MENU: Ft8h=  
     MaskBits|=ALTBIT; f5qHBQ  
     break; D& 6Qk&>  
    case VK_CONTROL: I 3,e)Z  
     MaskBits|=CTRLBIT; DoB3_=yJ+  
     break; MG5Sn*(C  
    case VK_SHIFT: W]Tt8  
     MaskBits|=SHIFTBIT; iK:qPrk-  
     break; -L50kk>h  
    default: //judge the key and send message P<JkRX  
     break; ^5 =E`q".  
   } $JSC+o(q3#  
   for(int index=0;index<MAX_KEY;index++) QZa#i L  
   { P 7.8tM2}  
    if(hCallWnd[index]==NULL) +X(^Q@  
     continue; 3pjYY$'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Jas|P}{=fT  
    { {)gd|JV*  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); l3#dfW{  
     bProcessed=TRUE; M9jo<+  
    } -/2$P  
   } HYnqx>L ~  
  } `ur9KP4Dq  
  if(!bProcessed){ Ollv _o3  
   for(int index=0;index<MAX_KEY;index++){ '{k Nbx51  
    if(hCallWnd[index]==NULL) YeVc,B'  
     continue; ~ 2oP,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) : It W|  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 2bxMIr  
   } H;Qn?^  
  } q]%bd[zkz  
 } Fsj&/: q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ^(JbJ@m/  
} 0THAI  
~#km0<r?  
BOOL InitHotkey() :.<TWBoV  
{ eo52X &I  
 if(hHook!=NULL){ gWH9=%!  
  nHookCount++; LU7)F,ok  
  return TRUE; A.x}%v,E  
 } }w^ T9OC  
 else ZBq*<VtV  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); s1$#G!'  
  if(hHook!=NULL) Cj9O [  
   nHookCount++; iT9Ex9RL  
  return (hHook!=NULL); (Tb0PzA  
} |ylTy B  
BOOL UnInit() dq/?&X  
{ 5@A=, GPUn  
 if(nHookCount>1){ Q~!hr0 ZR  
  nHookCount--;  `e=n( D  
  return TRUE; `'.x*MNF  
 } gH55c aF<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); CWsv#XOg]  
 if(unhooked==TRUE){ 7kpW 1tjY  
  nHookCount=0; FS+^r\)  
  hHook=NULL; SWd[iD  
 } NKhR%H  
 return unhooked; u0hbM9U>  
} z n8ig/C  
NG!Q< !Y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) OmbKx&>YGz  
{ "$cT*}br  
 BOOL bAdded=FALSE; 24/~gft  
 for(int index=0;index<MAX_KEY;index++){ G-?9;w'@  
  if(hCallWnd[index]==0){ b<78K5'  
   hCallWnd[index]=hWnd; gO!h<1!  
   HotKey[index]=cKey; je3n'^m  
   HotKeyMask[index]=cMask; q=i<vcw  
   bAdded=TRUE; LK/V]YG  
   KeyCount++; n$Fm~iPo,  
   break; H{zuIN/.1  
  } W2Z]?l;vQQ  
 } Jxw:Jk ~  
 return bAdded; U (7P X`1  
} 2Lgvy/uN  
n<&R"89  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) &+^ Y>Ke  
{ <qY>d,+E'  
 BOOL bRemoved=FALSE; EXzNehO~e  
 for(int index=0;index<MAX_KEY;index++){ [IA==B7  
  if(hCallWnd[index]==hWnd){ :FpBz~!a  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 6WcbJ_"mq  
    hCallWnd[index]=NULL; Qs X59d  
    HotKey[index]=0; ;*H~Yb0  
    HotKeyMask[index]=0; E'6P>6l5  
    bRemoved=TRUE; Qug'B  
    KeyCount--; >g0@ Bk  
    break; :.df(1(RL  
   } e-)1K  
  } tSa%ZkS  
 } K# < Wt5  
 return bRemoved; {5-{f=Rk  
} k T>}(G||  
:E`l(sI7J}  
void VerifyWindow() h l'k_<a*  
{ 5B/\vLHg4  
 for(int i=0;i<MAX_KEY;i++){ FY*0gp  
  if(hCallWnd!=NULL){ Jo+C!kc  
   if(!IsWindow(hCallWnd)){ bl-s0Ax-  
    hCallWnd=NULL; jk}PucV  
    HotKey=0; &bu`\|V  
    HotKeyMask=0; `.WKU"To  
    KeyCount--; 9GaER+d|  
   } 4\es@2q  
  } /loN Outw  
 } Bd[Gsns  
} gg_(%.>  
x[6Bc  
BOOL CHookApp::InitInstance() v"_#.!V  
{ 4FdH:os  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); |JQKxvjT  
 hins=AfxGetInstanceHandle(); RE$-{i  
 InitHotkey(); f L?~1i =  
 return CWinApp::InitInstance(); m uY^Fx  
} L$Z_j()2  
[_1G\z_iE  
int CHookApp::ExitInstance() kO4~N-&  
{ ^ ?9 ~R"  
 VerifyWindow(); ! NE q|Y  
 UnInit(); @$G K<jl  
 return CWinApp::ExitInstance(); imQNfNm  
} 2Jv4l$$;*  
SX;IUvVE5  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 1bs95Fh9Q  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) iO`f{?b  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ bYH_U4b  
#if _MSC_VER > 1000 -v@^6bQVp  
#pragma once q)zvePO#  
#endif // _MSC_VER > 1000 %*=FLtBjo  
G[,VPC=  
class CCaptureDlg : public CDialog epm|pA*  
{ b6BIDuRb  
 // Construction YO+d+5  
 public: q[K)bg{HB  
  BOOL bTray; m:CpDxzbf  
  BOOL bRegistered; SUhP e+  
  BOOL RegisterHotkey(); ,Z"sh*  
  UCHAR cKey;  ond/e&1  
  UCHAR cMask; iJeT+}  
  void DeleteIcon(); }clNXtN  
  void AddIcon(); 5]+eLKXB  
  UINT nCount; &>{L"{  
  void SaveBmp(); | 'G$}]H  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor *CSFkWVa  
  // Dialog Data GssoT<Y)Z  
  //{{AFX_DATA(CCaptureDlg) zv@o- R$l  
  enum { IDD = IDD_CAPTURE_DIALOG }; o\[nGf C&  
  CComboBox m_Key; `#F>?g$2  
  BOOL m_bControl; uESHTX/[  
  BOOL m_bAlt; b\mN^P~>A  
  BOOL m_bShift; |lY8u~%  
  CString m_Path; -tZb\4kh  
  CString m_Number; K)ib{V(50  
  //}}AFX_DATA #*@Yil=1  
  // ClassWizard generated virtual function overrides '"a8<7  
  //{{AFX_VIRTUAL(CCaptureDlg)  tvILLR  
 public: a8TE  
  virtual BOOL PreTranslateMessage(MSG* pMsg); eO#)QoHj^  
 protected: a3[aXe  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support '/?&Gol-  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); u"ow?[E  
  //}}AFX_VIRTUAL 3kg+*]tLx  
  // Implementation &(0);I@fc  
 protected: q~C6+  
  HICON m_hIcon; QKxu vW  
  // Generated message map functions #a| 5A:g%  
  //{{AFX_MSG(CCaptureDlg) ~8K~@e$./  
  virtual BOOL OnInitDialog(); cvt2P}ma#  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); V6N#%(?3  
  afx_msg void OnPaint(); (?(ahtT4T  
  afx_msg HCURSOR OnQueryDragIcon(); UQ y+ &;#5  
  virtual void OnCancel(); anYZ"GR+  
  afx_msg void OnAbout(); 6 ?cV1:jh  
  afx_msg void OnBrowse(); w:Vs$,  
  afx_msg void OnChange(); O^GTPYW  
 //}}AFX_MSG Y&?]t  
 DECLARE_MESSAGE_MAP() z`CI gSR  
}; zi'?FM[f)  
#endif xhv)rhu@  
~mU#u\r(*  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file =n!8>8d  
#include "stdafx.h" klKt^h-  
#include "Capture.h" m6}"g[nN  
#include "CaptureDlg.h" NH/H+7,o  
#include <windowsx.h> 6|9fcIh]B  
#pragma comment(lib,"hook.lib") dc* #?G6^  
#ifdef _DEBUG UNJ|J$T]  
#define new DEBUG_NEW <?eZ9eB  
#undef THIS_FILE 4*]`s|fbu  
static char THIS_FILE[] = __FILE__; ;lldxS  
#endif X |as1Y$O+  
#define IDM_SHELL WM_USER+1 BScysoeD  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 1'=brc YR  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); l6RJour  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; _]NM@'e  
class CAboutDlg : public CDialog DE tq]|80m  
{ mtp[]  
 public: rmhB!Lo  
  CAboutDlg(); u:k#1Nn!  
  // Dialog Data Ty5\zxC|  
  //{{AFX_DATA(CAboutDlg) i^(0,L  
  enum { IDD = IDD_ABOUTBOX }; I]h+24_S  
  //}}AFX_DATA wTLHg2'y^  
  // ClassWizard generated virtual function overrides `S2=LJ  
  //{{AFX_VIRTUAL(CAboutDlg) |Ia46YS  
 protected: ;tj_vmZ@R  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G{:L^2>  
  //}}AFX_VIRTUAL PGJ?=qXr#  
  // Implementation cCwT0O#d  
 protected: $W)FpN;CW/  
  //{{AFX_MSG(CAboutDlg) ?mMd6U&J  
  //}}AFX_MSG 7be?=c)+"  
  DECLARE_MESSAGE_MAP() 8d]= +n !  
}; SU:Cm: $  
.w`8_v&Y  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) WZ ZD  
{ 2>mDT  
 //{{AFX_DATA_INIT(CAboutDlg) = hpX2/]  
 //}}AFX_DATA_INIT +`ZcYLg)#  
} ){/y-ixH  
WW&0FugY_  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ~k&b3-A}  
{ x;N?'"GP  
 CDialog::DoDataExchange(pDX); JprZ6 >  
 //{{AFX_DATA_MAP(CAboutDlg) jtA Yp3M-$  
 //}}AFX_DATA_MAP n '&WIf3  
} St?vd+(>  
^+pmZw9 0  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) mZORV3bN  
 //{{AFX_MSG_MAP(CAboutDlg) *`\>J.  
 // No message handlers ,30&VW##  
 //}}AFX_MSG_MAP btee;3`  
END_MESSAGE_MAP() .DT1Jvl  
PR Y)hb;1  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) *Owq_)_ (|  
: CDialog(CCaptureDlg::IDD, pParent) UO</4WJ  
{ L3&NGcd  
 //{{AFX_DATA_INIT(CCaptureDlg) r"xo9&|  
  m_bControl = FALSE; R|_?yV[  
  m_bAlt = FALSE; Qv8Z64#  
  m_bShift = FALSE; {8E hC/=  
  m_Path = _T("c:\\"); t &*$@0A  
  m_Number = _T("0 picture captured."); 4bmpMF-  
  nCount=0; O,7P6  
  bRegistered=FALSE; #<)u%)`  
  bTray=FALSE; EF}Z+7A  
 //}}AFX_DATA_INIT \wM r[_LW  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 H>VuUH|  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); S\Q/ "Y  
} g5H+2lSC  
M6?*\ 9E  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) !X8:#a(  
{ a7ZPV1k  
 CDialog::DoDataExchange(pDX); kfn5y#6NZ  
 //{{AFX_DATA_MAP(CCaptureDlg) pbu8Ib8z  
  DDX_Control(pDX, IDC_KEY, m_Key); Z_S~#[\7^]  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); >RRb8=[J  
  DDX_Check(pDX, IDC_ALT, m_bAlt); Rj-<tR{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ]NN9FM.2b/  
  DDX_Text(pDX, IDC_PATH, m_Path); J)66\h=  
  DDX_Text(pDX, IDC_NUMBER, m_Number); /QG8\wXE2  
 //}}AFX_DATA_MAP T*z >A  
} O||M |  
I#m5Tl|#  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) :H6Ipa  
//{{AFX_MSG_MAP(CCaptureDlg) XjWoUnz  
 ON_WM_SYSCOMMAND() WPLAh_fe  
 ON_WM_PAINT() JVU:`BH  
 ON_WM_QUERYDRAGICON() *V>Iv/(  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) U<*ZY`B3  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;/$zBr`'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) z!eY=G'  
//}}AFX_MSG_MAP 1}9@aKM  
END_MESSAGE_MAP() D guAeK  
eEXer>Rm   
BOOL CCaptureDlg::OnInitDialog() Q[S""P.Z|  
{ ><dSwwu  
 CDialog::OnInitDialog(); Wl}d6ZTm  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~c+0SuJ  
 ASSERT(IDM_ABOUTBOX < 0xF000); J v'$6[?  
 CMenu* pSysMenu = GetSystemMenu(FALSE); z6$W@-Vd  
 if (pSysMenu != NULL) [|e7oNT(Q  
 { ?~;G)5  
  CString strAboutMenu; ~[Mm0L}8  
  strAboutMenu.LoadString(IDS_ABOUTBOX); kpcIU7|e  
  if (!strAboutMenu.IsEmpty()) GKSfr8US4  
  { !XQG1!|ww  
   pSysMenu->AppendMenu(MF_SEPARATOR); 2BEF8o]Np  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 90&ld:97  
  } )9,9yd~SI  
 } GAV|x]R  
 SetIcon(m_hIcon, TRUE); // Set big icon /`3< @{D  
 SetIcon(m_hIcon, FALSE); // Set small icon j $a,93P5  
 m_Key.SetCurSel(0); Ar N*9  
 RegisterHotkey(); a6fMx~  
 CMenu* pMenu=GetSystemMenu(FALSE); 8v_HIx0xu  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); \_qiUvPf\  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); $s$z"<  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); hC=9%u{r?  
 return TRUE; // return TRUE unless you set the focus to a control V07e29w  
} BJ wPSKL  
t=Tu-2,k  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ]HCu tq  
{ zaf%%  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) (pNA8i%=G  
 { =EgiV<6vcH  
  CAboutDlg dlgAbout; C|8.$s<  
  dlgAbout.DoModal(); J[ du>1D  
 } Ns?y) G>:  
 else H"6Sj-<=  
 { w-pdpbHV  
  CDialog::OnSysCommand(nID, lParam); }hv>LL  
 } 22)2o lU  
} 7FMO' 'x  
aHvTbpJ  
void CCaptureDlg::OnPaint() d#T~xGqz  
{ KpA iKe  
 if (IsIconic()) 7g[T#B'/x,  
 { F_$eu-y  
  CPaintDC dc(this); // device context for painting MPhO#;v  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); dUyit-  
  // Center icon in client rectangle q ;1]M[&  
  int cxIcon = GetSystemMetrics(SM_CXICON); y".uu+hL`  
  int cyIcon = GetSystemMetrics(SM_CYICON); l 2y_Nz-;  
  CRect rect; [RTB|0Q  
  GetClientRect(&rect); AtGk _tpVZ  
  int x = (rect.Width() - cxIcon + 1) / 2; JL=MlZ  
  int y = (rect.Height() - cyIcon + 1) / 2; k.NgE/;3  
  // Draw the icon J*IC&jH:  
  dc.DrawIcon(x, y, m_hIcon); t 5g@t0$  
 } wK!4:]rhG  
 else 18jI6$DY  
 { 7;ZSeQ yC  
  CDialog::OnPaint(); +pURF&Pr  
 } ^(r?k_i/  
} Yh\ } i  
0.Pd,L(  
HCURSOR CCaptureDlg::OnQueryDragIcon() OB FG!.)  
{ *W~+Nho.A  
 return (HCURSOR) m_hIcon; ]#z^G  
} epqX2`!V  
s>~ h<B  
void CCaptureDlg::OnCancel() +}@1X&v:  
{ yS%IE>?  
 if(bTray) BrcT`MM[(=  
  DeleteIcon(); I"eXoqh  
  CDialog::OnCancel(); rZm|7A)i  
} (sSMH6iCif  
why;1z>V  
void CCaptureDlg::OnAbout() 7+QD=j-  
{ x>THyY[sq  
 CAboutDlg dlg; q{?Po;\D  
 dlg.DoModal(); Z<T%:F  
} Ke@zS9  
#Y6'Q8g f  
void CCaptureDlg::OnBrowse() Lwm2:_\_b  
{ cPZD#";f  
 CString str; Rrm k\7/  
 BROWSEINFO bi; :yO.Te F  
 char name[MAX_PATH]; u^&2T(xG i  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); P]hS0,sE<(  
 bi.hwndOwner=GetSafeHwnd(); h)2W}p{a4=  
 bi.pszDisplayName=name; K"B2 SsC  
 bi.lpszTitle="Select folder"; \q(DlqTqs  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; H}5zKv.T  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); k\rzvo=U  
 if(idl==NULL) Rl@k~;VV  
  return; Pi7vuOJr8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); pV bgjJI  
 str.ReleaseBuffer(); W=fs"<  
 m_Path=str; xO"fg9a  
 if(str.GetAt(str.GetLength()-1)!='\\') gI a/sD2m>  
  m_Path+="\\"; ?$ T! =e"  
 UpdateData(FALSE); \} [{q  
} sJu^deX  
Ad!= *n  
void CCaptureDlg::SaveBmp() Yz4)Q1  
{ @LZ'Qc }@  
 CDC dc; O CIWQ/ P  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); Vf<VKP[9K  
 CBitmap bm; 0EiURVX  
 int Width=GetSystemMetrics(SM_CXSCREEN); oU[Ba8qh  
 int Height=GetSystemMetrics(SM_CYSCREEN); #-?C{$2I  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 0]%0wbY1  
 CDC tdc; {YnR]|0&  
 tdc.CreateCompatibleDC(&dc); n%GlO KC  
 CBitmap*pOld=tdc.SelectObject(&bm); 0*0]R C5?  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); c@H:?s!0R  
 tdc.SelectObject(pOld); G Xx7/X  
 BITMAP btm; )* 5R/oy,  
 bm.GetBitmap(&btm); g#b[-)Qx  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; r:Uqtqxh  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ODa+s>a`^  
 BITMAPINFOHEADER bih; [^sv.  
 bih.biBitCount=btm.bmBitsPixel; 0Yk@O) x  
 bih.biClrImportant=0; k1Cx~Q)XC  
 bih.biClrUsed=0; xdw"JS}  
 bih.biCompression=0; it V@U  
 bih.biHeight=btm.bmHeight; {!h|(xqN+  
 bih.biPlanes=1; $=?1>zvF  
 bih.biSize=sizeof(BITMAPINFOHEADER); ".aypD)W  
 bih.biSizeImage=size; tg%s#lLeH  
 bih.biWidth=btm.bmWidth; >; a_i>[  
 bih.biXPelsPerMeter=0; a![x^@nF  
 bih.biYPelsPerMeter=0; =xz Dpn>f  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); z/09~Hc  
 static int filecount=0; DL0jA/f  
 CString name; 6~g`B<(?  
 name.Format("pict%04d.bmp",filecount++); c|?0iN  
 name=m_Path+name; F|.,lb |L  
 BITMAPFILEHEADER bfh; GiI|6z!  
 bfh.bfReserved1=bfh.bfReserved2=0; @ n<y[WA  
 bfh.bfType=((WORD)('M'<< 8)|'B'); L,G{ t^j  
 bfh.bfSize=54+size; Ucnj7>+"  
 bfh.bfOffBits=54; wV\;,(<x=%  
 CFile bf; a|aRUxa0"  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ xe ng`!  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zGKDH=Yy ;  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); lFvRXV^+f  
  bf.WriteHuge(lpData,size); 022nn-~  
  bf.Close(); Y JzKE7%CO  
  nCount++; M-> /vi  
 } ={_.}   
 GlobalFreePtr(lpData); ND);7  
 if(nCount==1) $v|/*1S  
  m_Number.Format("%d picture captured.",nCount); 7)iB6RB K  
 else &.XYI3Ab1  
  m_Number.Format("%d pictures captured.",nCount); zdY+?s)p  
  UpdateData(FALSE); =fA* b  
} MLD-uI10{  
`U:W(\L  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) "XQj ~L  
{ }<?1\k  
 if(pMsg -> message == WM_KEYDOWN) 9nW/pv  
 { 9[.vtk\iyH  
  if(pMsg -> wParam == VK_ESCAPE) a3}#lY):  
   return TRUE; GMc{g  
  if(pMsg -> wParam == VK_RETURN) ma4Pmk  
   return TRUE; c6zghP3dR  
 } +)8,$1[p|  
 return CDialog::PreTranslateMessage(pMsg); jY^wqQls  
} 88c-K{} 3  
2 de[ yz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 3a#X:?  
{ q:Lw!'Z h  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ N^i<A2'6S;  
  SaveBmp(); }~gBnq_DDU  
  return FALSE; S0X %IG  
} E+XpgR5  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 8)I,WWj  
 CMenu pop; UuDT=_1Sh  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m(Hb! RT  
 CMenu*pMenu=pop.GetSubMenu(0); Fqtgw8  
 pMenu->SetDefaultItem(ID_EXITICON); FFE IsB"9  
 CPoint pt; fAx7_}k/ m  
 GetCursorPos(&pt); "&jWC  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I_vPGafMx  
 if(id==ID_EXITICON) w7n6@"q  
  DeleteIcon(); M9mC\Iz[  
 else if(id==ID_EXIT) M7D@Uj&xx(  
  OnCancel(); GE+ %V7  
 return FALSE; Rx';P/F0C  
} b-sbRR  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); n<Vq@=9AE  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) WxNPAJ6YH  
 AddIcon(); 6k?,'&z|~  
 return res; z}XmRc_Ko  
} D$k<<dvv  
>:5^4/fo*  
void CCaptureDlg::AddIcon() Vs>/q:I  
{ Ie3 F  
 NOTIFYICONDATA data; H)XHlO^  
 data.cbSize=sizeof(NOTIFYICONDATA); 45cMG~]p  
 CString tip; +h!OdWD9  
 tip.LoadString(IDS_ICONTIP); jVh I`F{n  
 data.hIcon=GetIcon(0); {/f\lS.5g  
 data.hWnd=GetSafeHwnd(); FmU>q)  
 strcpy(data.szTip,tip); 8u+FWbOl]  
 data.uCallbackMessage=IDM_SHELL; B o@B9/ABv  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; wSrq?U5q  
 data.uID=98;  VlGg?  
 Shell_NotifyIcon(NIM_ADD,&data); JzhbuWwF-  
 ShowWindow(SW_HIDE); :Ja]Vt  
 bTray=TRUE; dV{N,;z  
} M>Y ge~3  
1$cX` D`  
void CCaptureDlg::DeleteIcon() [8Zq 1tU;G  
{ RI,Z&kXj2o  
 NOTIFYICONDATA data; u_0&`zq  
 data.cbSize=sizeof(NOTIFYICONDATA); ppv/ A4Kv  
 data.hWnd=GetSafeHwnd(); Ave{ `YD  
 data.uID=98; C[cNwvz  
 Shell_NotifyIcon(NIM_DELETE,&data); [Xy^M3  
 ShowWindow(SW_SHOW); Vf Jpiv1  
 SetForegroundWindow(); gHU/yi!T  
 ShowWindow(SW_SHOWNORMAL); hdFIriE3  
 bTray=FALSE; L2v j)(  
} d,"?tip/SX  
eK }AVz}k  
void CCaptureDlg::OnChange() &<{=  
{ YuO-a$BP  
 RegisterHotkey(); JXR_klx  
} g.CUo:c  
A]VcQ_e  
BOOL CCaptureDlg::RegisterHotkey() C)2Waj}  
{ JaC =\\B  
 UpdateData(); :5/P{Co (  
 UCHAR mask=0; k!/"J ;  
 UCHAR key=0; zbL!q_wO  
 if(m_bControl) r[P5 ufy2]  
  mask|=4; G]q1_q4P1?  
 if(m_bAlt) W/dl`UDY  
  mask|=2; <OG rC .k}  
 if(m_bShift) }m6zu'CV  
  mask|=1; {fsU(Jj\  
  key=Key_Table[m_Key.GetCurSel()]; ~WS;)Q0|  
 if(bRegistered){ I?sA)!8  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); oH/6  
  bRegistered=FALSE; j(j o8  
 } ;F)g r  
 cMask=mask; 'jv[Gcss3L  
 cKey=key; sP1wO4M?{  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); n-q  
 return bRegistered; ?y( D_NtL  
} ]e0yC  
_c}@Fi+E  
  四、小结 H ]BH  
A?{ X5` y  
  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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