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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: 'Pu;]sC  
  g(H3arb&  
  一、实现方法 vJUB;hD  
NmF2E+'  
  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: Z+4Oa f!  
FCJ(D!  
#pragma data_seg("shareddata") )ixE  
HHOOK hHook =NULL; //钩子句柄 Nq6CvDXi  
UINT nHookCount =0; //挂接的程序数目 7~f6j:{|z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 /U]5#'i  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 dD<kNa}2  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey IpmREl $j  
static int KeyCount =0; h8Si,W 3o  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 >GUTno$J  
#pragma data_seg() >@uYleD(  
V%=t2+  
  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。  B4ze$#  
n #/m7  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: our5k   
3R .cj  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR f BOG#-a}  
cKey,UCHAR cMask) P'~3WL4MKs  
{ {HnOUc\4  
 BOOL bAdded=FALSE; o]U ==  
 for(int index=0;index<MAX_KEY;index++){ ]NsaFDi\  
  if(hCallWnd[index]==0){ rRel\8  
   hCallWnd[index]=hWnd; V= PoQ9d  
   HotKey[index]=cKey; ^]gl#&"D  
   HotKeyMask[index]=cMask; @CDRbXoFk  
   bAdded=TRUE; #JucOWxjY  
   KeyCount++; M-|2W~YU  
   break; *2;3~8Y  
  } L 3@wdC ~0  
 } T]2q >N  
 return bAdded; heA\6W:u&  
} jqedHn x  
//删除热键 +ETw:i9!?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C\D4C]/8  
{ N2J!7uoQ  
 BOOL bRemoved=FALSE; =x>k:l~s  
 for(int index=0;index<MAX_KEY;index++){ a@J :*W  
  if(hCallWnd[index]==hWnd){ e?WR={  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ u*`GIRfWT  
    hCallWnd[index]=NULL; (p!AX<=z  
    HotKey[index]=0; -<=< T@,  
    HotKeyMask[index]=0; wf1DvsJQl  
    bRemoved=TRUE; DYK|"@  
    KeyCount--; ^XVa!s,d  
    break; (tN$G:+")F  
   } UxtZBNn8  
  } m=V2xoMw6  
 } [y>.)BU  
 return bRemoved; Cj9Tj'0@I+  
} XZGyhX7  
BW 7[JD  
'QU ?O[CH  
  DLL中的钩子函数如下: W9~datIh>  
_A r ,]v  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) ;@hP*7Lm  
{ r1]^#&V;MC  
 BOOL bProcessed=FALSE; lc7]=,qyF  
 if(HC_ACTION==nCode) qa0Zgn5q  
 { $49tV?q5  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 } _z~:{Y  
   switch(wParam) 6:pN?|=6X  
   {  nE84W$\  
    case VK_MENU: 9qA_5x%"%u  
     MaskBits&=~ALTBIT; >2/zL.O  
     break; mgWtjV 8  
    case VK_CONTROL: jXf-+ ;ZQ  
     MaskBits&=~CTRLBIT; 9nE%r\H  
     break; 5hMiCod  
    case VK_SHIFT: )j'b7)W\  
     MaskBits&=~SHIFTBIT; .O^|MhBJu  
     break; 0 CS_-  
    default: //judge the key and send message +qec>ALAg  
     break; NYeg,{q  
   } ,<7f5qg "'  
   for(int index=0;index<MAX_KEY;index++){ :e;fs.C  
    if(hCallWnd[index]==NULL) I<U 1V<g  
     continue; ?}>tfDu'  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) psVRdluS   
    { 1rC'sfz  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 76/%Py|  
     bProcessed=TRUE; ] W_T(C*  
    } OH w6#N$\  
   } 9'M_tMm5  
  } I j /J  
  else if((lParam&0xc000ffff)==1){ //有键按下 =g:\R$lQ  
   switch(wParam) iVcBD0 q)  
   { X1"nq]chGy  
    case VK_MENU: zqkmsFH{  
     MaskBits|=ALTBIT; 9^tyjX2  
     break; {PKER$C  
    case VK_CONTROL: \!3='~2:=o  
     MaskBits|=CTRLBIT; n9^zAcUbAW  
     break; o%a$m9I  
    case VK_SHIFT: K0]Wb=v  
     MaskBits|=SHIFTBIT; M*N8p]3Cq  
     break; )UJMmw\  
    default: //judge the key and send message Fh'Jb*|Q  
     break; mq L+W  
   } q'q{M-U<  
   for(int index=0;index<MAX_KEY;index++){ 5cU8GgN`  
    if(hCallWnd[index]==NULL) g2I@j3  
     continue; .(-3L9T}  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) Sy_M!`B  
    { ^BZdR<;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); sMx\WTyz  
     bProcessed=TRUE; "`k[ 4C  
    } ]{hfM  
   } ]nh)FMo  
  } {`LV{ !  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 f8lww)^,v  
   for(int index=0;index<MAX_KEY;index++){ e+mD$(h  
    if(hCallWnd[index]==NULL) 79v&6Io  
     continue; K5$ y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) !FO)||'[  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); P_gQ-pF.  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 !ktr|9Bl  
   } |8B[yr.b  
  } 3]i1M%'i  
 } ,x/j&S9!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); "'Q:%_;  
} ]x|sT Kv2  
@."R9s  
  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: /%)J+K)  
~VKw%WK  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `PL!>oa(8  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); .1@5*xQ5O  
KR*/yeG!E  
  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: " O4Z).5q3  
3-05y!vbcE  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) +vP1DXtj(  
{ cmTZ))m  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) epnDvz\   
 { O  tr@jgw  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ]WG\+1x9  
  SaveBmp(); <Wd$6  
  return FALSE; 4ZIXG,@mZJ  
 } &}]Wbk4:  
 …… //其它处理及默认处理 )JPcSy*  
} 3Wiu`A  
K"#}R<k8:A  
zri<'W  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 wv<"W@& 9  
XxIUB(.QI  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 \h-[u%  
~LVa#  
  二、编程步骤 ,Y*f]  
&^EkM  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; X7G6y|4;w  
,O2F}5|;  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ;23F8M%wH  
[8"nRlXH  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; V;m3=k0U  
^^Ius ]  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ,MLPVDN*D  
G~JQcJFj  
  5、 添加代码,编译运行程序。 loZfzN&6A  
tFGLqR%/  
三、程序代码 "Xm'(c(  
`27? f$,  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Kl* ##qw!  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) 9u9#&xx  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ G/y< bPQ  
#if _MSC_VER > 1000 GXAcy OV  
#pragma once 3laSPih[.  
#endif // _MSC_VER > 1000 PtHT>  
#ifndef __AFXWIN_H__ u$0>K,f  
#error include 'stdafx.h' before including this file for PCH 8S0)_L#S  
#endif *}?^)z7w  
#include "resource.h" // main symbols MV/JZ;55  
class CHookApp : public CWinApp csC3Wm{v  
{ Z5+0?X0i  
 public: ISl'g'o  
  CHookApp(); fROhn}<**[  
  // Overrides |$D^LY  
  // ClassWizard generated virtual function overrides s:jwwE2  
  //{{AFX_VIRTUAL(CHookApp) HJ2]xe09  
 public: {DpZg",H-  
  virtual BOOL InitInstance(); i_MDLS>-  
  virtual int ExitInstance(); p\(%bO   
  //}}AFX_VIRTUAL A >x{\  
  //{{AFX_MSG(CHookApp) }, ]W/  
  // NOTE - the ClassWizard will add and remove member functions here. AIE)q]'Q  
  // DO NOT EDIT what you see in these blocks of generated code ! DI*xf Kt  
  //}}AFX_MSG a`T{ 5*@  
  DECLARE_MESSAGE_MAP() rO-Tr  
}; }p#S;JZRu+  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Hi ?],5,/  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E_h9y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); $, =n  
BOOL InitHotkey(); r6^DD$X  
BOOL UnInit(); 0c]Lm?&  
#endif `0sa94H1[  
IlwY5iL  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. E_xpq  
#include "stdafx.h" F Hv|6zUX  
#include "hook.h" `T-(g1:9  
#include <windowsx.h> ?J>^X-z  
#ifdef _DEBUG 5!?><{k=%  
#define new DEBUG_NEW 6Up,B=sX0  
#undef THIS_FILE T-27E$0  
static char THIS_FILE[] = __FILE__; }g3)z%Xe'[  
#endif ;1BbRnCr  
#define MAX_KEY 100 4b4nFRnH  
#define CTRLBIT 0x04 D3I;5m`_  
#define ALTBIT 0x02 <uA|nYpp  
#define SHIFTBIT 0x01 Z!#zr@'k  
#pragma data_seg("shareddata") d/;oNC+  
HHOOK hHook =NULL; }ulFW]A^7  
UINT nHookCount =0; 39u!j|VH  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey utQ_!3u  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT s,0,w--=  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey A }dl@  
static int KeyCount =0; ;'nu9FU*O  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?bbguwo~F  
#pragma data_seg() IH{g-#U  
HINSTANCE hins; dLv\H&  
void VerifyWindow(); ecr pv+  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) qgu.c`GmW  
//{{AFX_MSG_MAP(CHookApp) .>&kA f.  
// NOTE - the ClassWizard will add and remove mapping macros here. u{I)C0  
// DO NOT EDIT what you see in these blocks of generated code! B&tl6?7h  
//}}AFX_MSG_MAP $ZE OE8.\  
END_MESSAGE_MAP() ]92@&J0w  
sR#( \  
CHookApp::CHookApp() &!~q#w1W-5  
{ e`Yx]3;u(  
 // TODO: add construction code here, )u<sEF  
 // Place all significant initialization in InitInstance C,K P!B{  
} Zr`:A$  
N2C^'dFj  
CHookApp theApp; XO\P4x :c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) +HNQ2YZ  
{ ]F-{)j  
 BOOL bProcessed=FALSE; [Q)lJTs  
 if(HC_ACTION==nCode) C#(4>'  
 { W<kJ%42^j  
  if((lParam&0xc0000000)==0xc0000000){// Key up Al 0zL  
   switch(wParam) .4U::j}  
   { #VD[\#  
    case VK_MENU: E_-CsL%  
     MaskBits&=~ALTBIT; KbSIKj  
     break; ]_j{b)t  
    case VK_CONTROL: C7,Ol0`v  
     MaskBits&=~CTRLBIT; /f_lWr:9l  
     break; l 4(-yWC$H  
    case VK_SHIFT: {ImZ><xe/  
     MaskBits&=~SHIFTBIT; wz;IKdk[  
     break; Dk8" H >*  
    default: //judge the key and send message q S2#=  
     break; N-;e" g  
   } WFy90*@Z  
   for(int index=0;index<MAX_KEY;index++){ M" %w9)@  
    if(hCallWnd[index]==NULL) '@rGX+"  
     continue; 8{@#N:SY  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) iYBs )  
    { |odl~juU  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); wn5CaP(]8  
     bProcessed=TRUE; ->:G+<  
    } &rk /ya[  
   } vxK}f*d  
  } =3Y?U*d  
  else if((lParam&0xc000ffff)==1){ //Key down {B uh5U,  
   switch(wParam) )9J&M6LX  
   { D24@lZ`g~  
    case VK_MENU: YWjw`,EA(  
     MaskBits|=ALTBIT; ,+%$vV .g\  
     break; 8D)2/$NsY}  
    case VK_CONTROL: #\o VbVq  
     MaskBits|=CTRLBIT; uQ. m[y  
     break; ABB4(_3E  
    case VK_SHIFT: r `VKb  
     MaskBits|=SHIFTBIT; z1_\P) M  
     break; StA5h+[m  
    default: //judge the key and send message wF[^?K '  
     break; jbGP`b1_  
   } %YA=W=Yd  
   for(int index=0;index<MAX_KEY;index++) 4w\cS&X~C  
   { 4)i/B99k  
    if(hCallWnd[index]==NULL) (?D47^F &  
     continue; b$H{|[  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) u\.7#D>  
    { K6{{\r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); WTZP}p1  
     bProcessed=TRUE; u-yQP@^H  
    } #8QQZdC8`  
   } #GY;.,  
  } P$4G2>D8dg  
  if(!bProcessed){ MW6d-  
   for(int index=0;index<MAX_KEY;index++){ S2h?Q $e3  
    if(hCallWnd[index]==NULL) aB+Ux< -  
     continue; -(ABQgSO]  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Gr}Lp  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); St^s"A  
   } ^LX1&yT@  
  } ;}ileL Tl  
 } O3PE w4yA  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); &U*=D8!0  
} SZea[~ &  
8$BZbj%?hx  
BOOL InitHotkey() ZV$qv=X  
{ Y FL9Q<  
 if(hHook!=NULL){ -P^ 6b(  
  nHookCount++; 1nye.i~  
  return TRUE; ehPrxIyC  
 } eI/9uR%  
 else JF IUD{>fp  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); XL1v&'HLV  
  if(hHook!=NULL) E?m(&O j  
   nHookCount++; 5\A[ra  
  return (hHook!=NULL); _t_X`  
} mvyqCOp 0  
BOOL UnInit() VZ 5EV'D8!  
{ d:|X|0#\uH  
 if(nHookCount>1){ CfNHv-jDL  
  nHookCount--; |x3.r t  
  return TRUE; gT 22!  
 } RHZ5f0b4L  
 BOOL unhooked = UnhookWindowsHookEx(hHook); hS/oOeG<Y  
 if(unhooked==TRUE){ 6Xu8~%i  
  nHookCount=0; b7^VWX%  
  hHook=NULL; Y.$ '<1  
 } FY|.eY_7 {  
 return unhooked; g@BQ!}_#5  
} J*vy-[w  
=X'i^Q  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) y2bL!Y<s9  
{ !ZPaU11  
 BOOL bAdded=FALSE; |[7xTD  
 for(int index=0;index<MAX_KEY;index++){ ,b%T[s7  
  if(hCallWnd[index]==0){ llXyM */  
   hCallWnd[index]=hWnd; s_}T -%\  
   HotKey[index]=cKey; ,|,DXw  
   HotKeyMask[index]=cMask; hz\Fq1  
   bAdded=TRUE; V\^3I7F  
   KeyCount++; yCy4t6`e  
   break; ,A T!:&<X  
  } NguJ[  
 } 0'{0kE[wn  
 return bAdded; - &Aw] +  
} wws)**]J8  
l*T> 9yC  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ;I1}g]  
{ ]([:"j  
 BOOL bRemoved=FALSE; 4mq+{c0  
 for(int index=0;index<MAX_KEY;index++){ 2"*7H S  
  if(hCallWnd[index]==hWnd){ K+5S7wFDZ  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ po~V{>fUm  
    hCallWnd[index]=NULL; S-&[Tp+N  
    HotKey[index]=0; q-P$ \":  
    HotKeyMask[index]=0; uDJi2,|n  
    bRemoved=TRUE; ~3< Li}W  
    KeyCount--; - |n\  
    break; .{%~4$yu7  
   } gDU~hv  
  } t84(kzcC  
 } }u8o*P|,  
 return bRemoved; ^tc2?T  
} 5}@6euT5$  
;+t~$5  
void VerifyWindow() JY8wo5H  
{ Fsv:SL+5  
 for(int i=0;i<MAX_KEY;i++){ c+|,q m  
  if(hCallWnd!=NULL){ Hg\+:}k&9  
   if(!IsWindow(hCallWnd)){ ]V \qX+K  
    hCallWnd=NULL; $R4[TQY).!  
    HotKey=0; He^u+N@B  
    HotKeyMask=0; =X6WK7^0  
    KeyCount--; ?9 hw]Q6r}  
   } 1:%HE*r  
  } uKHkC.g  
 } GP6-5Y"8  
} }JyWy_Y  
m&(yx| a4+  
BOOL CHookApp::InitInstance() |d\ rCq >  
{ WlVp|s{TYP  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); I%.KFPV  
 hins=AfxGetInstanceHandle(); C50&SrnBU1  
 InitHotkey(); lL_M=td8W  
 return CWinApp::InitInstance(); GInU7y904  
} teh$W<C  
jsL\{I^>  
int CHookApp::ExitInstance() HL-zuZa`Ju  
{ YcW[BMy5h  
 VerifyWindow(); gU1E6V-Jm  
 UnInit(); -S5M>W.Qb{  
 return CWinApp::ExitInstance(); vX|ZPn#  
} # ~SuL3  
HH =sq  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file |_ZD[v S  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) J`}5bnFP  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ wmbjL=f Ia  
#if _MSC_VER > 1000 04>dxw)8  
#pragma once <$!^LKKzA  
#endif // _MSC_VER > 1000 !pY=\vK;  
cz<8Kb/XV  
class CCaptureDlg : public CDialog ej-x^G?C  
{ MN1 kR  
 // Construction -{H; w=9  
 public: }? j>V  
  BOOL bTray; aN9#ATE  
  BOOL bRegistered; )f(.{M  
  BOOL RegisterHotkey(); wG6@. ;3  
  UCHAR cKey; 3";Rw9  
  UCHAR cMask; $@k[Xh  
  void DeleteIcon(); 2K?~)q&t*  
  void AddIcon(); *c'nPa$+|S  
  UINT nCount; j. UQLi&`  
  void SaveBmp(); pMZKF=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor <%WN<T{q|  
  // Dialog Data Z@ AHe`A  
  //{{AFX_DATA(CCaptureDlg) I`Goc!5t  
  enum { IDD = IDD_CAPTURE_DIALOG }; *((wp4b  
  CComboBox m_Key; Itn7Kl  
  BOOL m_bControl; OL+dx`Y  
  BOOL m_bAlt; 0IU>KGJ-0s  
  BOOL m_bShift; :.KN;+tP  
  CString m_Path; M JJ]8:%  
  CString m_Number; GQ<]Sd}[  
  //}}AFX_DATA h&Thq52R  
  // ClassWizard generated virtual function overrides ?Ne@OMc  
  //{{AFX_VIRTUAL(CCaptureDlg) =\CJsS.  
 public: H}G=%j0  
  virtual BOOL PreTranslateMessage(MSG* pMsg); =*EIe z*.x  
 protected: 242dT/j  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support z~tCag8I(k  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); *=UxX ] 0y  
  //}}AFX_VIRTUAL Pp-\#WJ  
  // Implementation ie4keVlXc  
 protected: 9$[I~I#z  
  HICON m_hIcon; lR] z8 &  
  // Generated message map functions g$C-G5/bjD  
  //{{AFX_MSG(CCaptureDlg) c32IO&W4  
  virtual BOOL OnInitDialog(); vd>K=! J  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); |X&.+RI  
  afx_msg void OnPaint(); hT:+x3  
  afx_msg HCURSOR OnQueryDragIcon(); o!.\+[  
  virtual void OnCancel(); Wr3j8"f/  
  afx_msg void OnAbout(); B&^WRM;7t  
  afx_msg void OnBrowse(); ke.{wh\0  
  afx_msg void OnChange(); 9[qEJ$--  
 //}}AFX_MSG ::13$g=T9s  
 DECLARE_MESSAGE_MAP() 2kg<O%KA`c  
}; :|hFpLt  
#endif +B^(,qKMN  
x1:#rb'  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file @oC# k<  
#include "stdafx.h" }6/L5j:+  
#include "Capture.h" ?v-Y1j  
#include "CaptureDlg.h" #hinb[fQ  
#include <windowsx.h> D(3\m)  
#pragma comment(lib,"hook.lib") jDI)iW`P  
#ifdef _DEBUG 8#%Sq=/+M  
#define new DEBUG_NEW 5~(.:RX:q  
#undef THIS_FILE zJ;K4)"j  
static char THIS_FILE[] = __FILE__; >:W7f2%8`  
#endif =+um:*a.  
#define IDM_SHELL WM_USER+1 uK6_HvHuy  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); QF^_4Yn  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); qk}(E#.>F\  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 'qD5  
class CAboutDlg : public CDialog ogN/zIU+VA  
{ zqEMR>px  
 public: Uh.XL=wY  
  CAboutDlg(); e">$[IhXtV  
  // Dialog Data M%=V vE.I  
  //{{AFX_DATA(CAboutDlg) oK3uGPi  
  enum { IDD = IDD_ABOUTBOX }; % :?_N  
  //}}AFX_DATA :uM2cc^  
  // ClassWizard generated virtual function overrides vCC}IDd  
  //{{AFX_VIRTUAL(CAboutDlg) rEI]{?eoF  
 protected: YG2rJY+*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support NOOP_:(7H  
  //}}AFX_VIRTUAL  =[Lo9Sg  
  // Implementation $lkd9r1   
 protected: x;H#-^LxW=  
  //{{AFX_MSG(CAboutDlg) RB]K?  
  //}}AFX_MSG p #vZYwe=L  
  DECLARE_MESSAGE_MAP() F 8*e  
}; Eyw)f>  
HVb9YU+  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) h&|wqna  
{ }z/;^``  
 //{{AFX_DATA_INIT(CAboutDlg) rE?(_LI  
 //}}AFX_DATA_INIT RG(m:N  
} s3m]rC  
?h`Ned0P  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ] iKFEd  
{ BKoc;20;  
 CDialog::DoDataExchange(pDX); 1FfdW>ay*  
 //{{AFX_DATA_MAP(CAboutDlg) y w"Tw  
 //}}AFX_DATA_MAP !\{&^,y  
} 4Q0@\dR9  
X|.M9zIx  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) X1*6qd+E  
 //{{AFX_MSG_MAP(CAboutDlg) by*>w/@9)k  
 // No message handlers JyPsRpi\  
 //}}AFX_MSG_MAP 2N]u!S;d  
END_MESSAGE_MAP() W":is"  
muLt/.EZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) i4T U}.h8  
: CDialog(CCaptureDlg::IDD, pParent) \'( @{  
{ 5ug?'TOj'  
 //{{AFX_DATA_INIT(CCaptureDlg) Q(lj &!?1k  
  m_bControl = FALSE; |_l\.  
  m_bAlt = FALSE; >V~q`htth  
  m_bShift = FALSE; @Z$`c{V<  
  m_Path = _T("c:\\"); @_0 g "Ul  
  m_Number = _T("0 picture captured."); lD09(|`  
  nCount=0; D .3Q0a6  
  bRegistered=FALSE; C]aa^_Ldd-  
  bTray=FALSE; yHW=,V.  
 //}}AFX_DATA_INIT I\R5Cb<p  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 zUn> )#ZC  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); eqbxf#H!  
} l ' ]d&  
Wpom{-  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 9kPwUAw  
{ oF/5mh__(K  
 CDialog::DoDataExchange(pDX); 9%\<x  
 //{{AFX_DATA_MAP(CCaptureDlg) ]d"4G7mu`l  
  DDX_Control(pDX, IDC_KEY, m_Key); H[o'j@0  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &]~z-0`$!  
  DDX_Check(pDX, IDC_ALT, m_bAlt); @+",f]  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); G'XlsyaWrb  
  DDX_Text(pDX, IDC_PATH, m_Path); bw#zMU^E  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 4QWDuLu  
 //}}AFX_DATA_MAP  9H*$3  
} sg 12C  
SdUtAC2  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) *(ex:1sW  
//{{AFX_MSG_MAP(CCaptureDlg) qE6:`f  
 ON_WM_SYSCOMMAND() ie$QKoE  
 ON_WM_PAINT() 8?']W\)  
 ON_WM_QUERYDRAGICON() HMNjQ 1y  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) * [*#cMZ   
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6G"AP~|0  
 ON_BN_CLICKED(ID_CHANGE, OnChange) *BVkviqxz  
//}}AFX_MSG_MAP ).eT~e Gj  
END_MESSAGE_MAP() *IzcW6 [9  
^SCZ  
BOOL CCaptureDlg::OnInitDialog() _<5o1  
{ ;VS;),h/  
 CDialog::OnInitDialog(); <FH3 ePz  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bG +p  
 ASSERT(IDM_ABOUTBOX < 0xF000); '#<?QE!d2  
 CMenu* pSysMenu = GetSystemMenu(FALSE); x]%e_  
 if (pSysMenu != NULL) 84P^7[YX>  
 { "}D uAs  
  CString strAboutMenu; JGIN<J85e  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Oa~t&s  
  if (!strAboutMenu.IsEmpty()) k%QhF]  
  { t~p9iGX<  
   pSysMenu->AppendMenu(MF_SEPARATOR); zW%-Z6%D  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !m pRLBH  
  } JGZ,5RTq4-  
 } x Mtl<Na   
 SetIcon(m_hIcon, TRUE); // Set big icon ?n/:1LN,  
 SetIcon(m_hIcon, FALSE); // Set small icon h 88iZK  
 m_Key.SetCurSel(0); _jef{j  
 RegisterHotkey(); yhEU *\:  
 CMenu* pMenu=GetSystemMenu(FALSE); V_U$JKJ1=  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); D0PP   
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); U;Hu:q*  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); H;s0|KRgJ  
 return TRUE; // return TRUE unless you set the focus to a control uc%75TJ@  
} 3a#637%  
%Zx/XMs}e  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) IDzP<u8v  
{ 'q1)W'  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) sCaw"{5qc  
 { N##T1 Qm)  
  CAboutDlg dlgAbout; =KNg "|  
  dlgAbout.DoModal();  <_MQC  
 } %-]j;'6}cX  
 else !'ajpK  
 { 5@j?7%_8  
  CDialog::OnSysCommand(nID, lParam); @okC":Fw,  
 } .eXIbd<C  
} 'O]_A57  
/{7x|ay]  
void CCaptureDlg::OnPaint() ? $pGG  
{ %xLziF  
 if (IsIconic()) F$ Us! NN  
 { u4$d#0sA  
  CPaintDC dc(this); // device context for painting dT,X8 "  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); i[d-n/)  
  // Center icon in client rectangle KBzEEvx/$  
  int cxIcon = GetSystemMetrics(SM_CXICON); n_v c}ame  
  int cyIcon = GetSystemMetrics(SM_CYICON); '. atbl  
  CRect rect; WKBPqfC  
  GetClientRect(&rect); gU>Y  
  int x = (rect.Width() - cxIcon + 1) / 2; i1vBg}WHN  
  int y = (rect.Height() - cyIcon + 1) / 2; wx(| $2{h  
  // Draw the icon NNutpA}s  
  dc.DrawIcon(x, y, m_hIcon); 3-32q)8  
 } =DE5 Wq19  
 else Ym& _IOx  
 { @Qruc\_  
  CDialog::OnPaint(); ;#/b=j\pi  
 } N3vk<sr@  
} 'n4zFj+S  
DXKk1u?Tq  
HCURSOR CCaptureDlg::OnQueryDragIcon() FO3!tJ\L  
{ #zrD i  
 return (HCURSOR) m_hIcon; - K}@Gp  
} T>n,@?#K  
} 5OlX  
void CCaptureDlg::OnCancel() Podm 3b  
{ +qpD>5#  
 if(bTray) ~ ;)@a  
  DeleteIcon(); $g#X9/+<  
  CDialog::OnCancel(); .eZ4?|at.F  
} jc;&g)Rv  
!Si ZA"  
void CCaptureDlg::OnAbout() ; {I{X}b  
{ rVQ:7\=Z  
 CAboutDlg dlg; %~Nf,  
 dlg.DoModal(); `mw@"  
} CN brXN  
J;m[1Mae&  
void CCaptureDlg::OnBrowse() 6xnJyEQUM  
{ M P0ww$(  
 CString str; K+T`'J4  
 BROWSEINFO bi; LdWeI  
 char name[MAX_PATH]; |[!xLqG  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 'r1&zw(  
 bi.hwndOwner=GetSafeHwnd(); |V!A!tB  
 bi.pszDisplayName=name; ,dBtj8=  
 bi.lpszTitle="Select folder"; b^Rg_,s  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; !6<2JNf  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ^N Et{]x  
 if(idl==NULL) ]o,)#/' $  
  return; aM?7'8/  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); '-w G  
 str.ReleaseBuffer(); J5J3%6I  
 m_Path=str; B+zq!+ HJ  
 if(str.GetAt(str.GetLength()-1)!='\\') y*Ex5N~JC  
  m_Path+="\\"; PK3T@Qv89  
 UpdateData(FALSE); +|#sF,,X4g  
} 2U~oWg2P  
lt,x(2  
void CCaptureDlg::SaveBmp() s)/i_Oe$\  
{ .vpQ3m>  
 CDC dc; Qg9{<0{u  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ~Gwn||g78  
 CBitmap bm; gvA&F |4  
 int Width=GetSystemMetrics(SM_CXSCREEN); L>@0Nne7  
 int Height=GetSystemMetrics(SM_CYSCREEN); Fdc bmQ  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 1`aFL5[0$  
 CDC tdc; 'ARQ7 Q[`  
 tdc.CreateCompatibleDC(&dc);  r) X?H  
 CBitmap*pOld=tdc.SelectObject(&bm); %5F=!( w  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); *WX6C("M  
 tdc.SelectObject(pOld); +#&2*nY  
 BITMAP btm; [>"qOFCr#:  
 bm.GetBitmap(&btm); #B+2qD>E  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; &k1Ez  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); )- 2^Jvc  
 BITMAPINFOHEADER bih; Yl-09)7s  
 bih.biBitCount=btm.bmBitsPixel; 5r zB "L  
 bih.biClrImportant=0; X*S|aNaLWW  
 bih.biClrUsed=0; C8&)-v|  
 bih.biCompression=0; @ULr)&9  
 bih.biHeight=btm.bmHeight; XHpoaHyx  
 bih.biPlanes=1; Fzu"&&>0$  
 bih.biSize=sizeof(BITMAPINFOHEADER); [gv2fqpP  
 bih.biSizeImage=size; ;PS [VdV  
 bih.biWidth=btm.bmWidth; dC,F?^  
 bih.biXPelsPerMeter=0; uu#ALB Jm  
 bih.biYPelsPerMeter=0; zKiKda%)  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); {Qw,L;R  
 static int filecount=0; IUu[`\b=  
 CString name; w:N\]=Vh  
 name.Format("pict%04d.bmp",filecount++); &,)9cV /  
 name=m_Path+name; !(SaE'  
 BITMAPFILEHEADER bfh; 2d$hgR#v  
 bfh.bfReserved1=bfh.bfReserved2=0;  ZfvFs  
 bfh.bfType=((WORD)('M'<< 8)|'B'); uE5kL{Fv  
 bfh.bfSize=54+size; rxa8X wo8  
 bfh.bfOffBits=54; _HGDqj L  
 CFile bf; MHxv@1)K|Y  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ I9>1WT<Yy  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); .4KXe"~E  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ~=0zZTG  
  bf.WriteHuge(lpData,size); 4|++0=#D$  
  bf.Close(); /5yW vra  
  nCount++; N{Is2Ia  
 } 5,?9#n\E,  
 GlobalFreePtr(lpData); kv (N/G  
 if(nCount==1) /1MO]u\  
  m_Number.Format("%d picture captured.",nCount); -u{k  
 else Q'Q+mt8u5  
  m_Number.Format("%d pictures captured.",nCount); |n6nRE wW  
  UpdateData(FALSE); vaK$j!%FE  
} rm"bplLZA  
w #1l)+  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) {mkYW-4Se  
{ vV=$N"bT~  
 if(pMsg -> message == WM_KEYDOWN) SrHRpxy  
 { ?J<4IvL/  
  if(pMsg -> wParam == VK_ESCAPE) Keof{>V=CA  
   return TRUE; v5<Ext rV  
  if(pMsg -> wParam == VK_RETURN) t[an,3  
   return TRUE; ^$x^JM ]/  
 } "2=v?,'t  
 return CDialog::PreTranslateMessage(pMsg); i 3?zYaT  
} ;'vY^I8-L  
1Z`<HW"  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) sKHUf1   
{ Ko -<4wu  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ yiI&>J))  
  SaveBmp(); qvYw[D#.  
  return FALSE; !T @|9PCp  
} :5CwRg  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ *AxKV5[H  
 CMenu pop; \:" s*-  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); Sf*VkH  
 CMenu*pMenu=pop.GetSubMenu(0); :5"|iRP'  
 pMenu->SetDefaultItem(ID_EXITICON); 5RlJybN"o  
 CPoint pt; c]xpp;%]  
 GetCursorPos(&pt); KgKV(q=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o'D6lkf0  
 if(id==ID_EXITICON) 0V`/oaW;  
  DeleteIcon(); TH6g:YP`7  
 else if(id==ID_EXIT) KUuwScb\  
  OnCancel(); k87B+0QEL  
 return FALSE; 1~5={eI  
} QiwZk<rb  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); eKLxNw5  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) PU-;Q@< E  
 AddIcon(); U15Hq*8Z  
 return res; 0]NsT0M  
} UGR5ILf  
l<qxr.X  
void CCaptureDlg::AddIcon() ^M?uv{354  
{ |dXS+R1  
 NOTIFYICONDATA data; x$M[/ID0  
 data.cbSize=sizeof(NOTIFYICONDATA); [0IeEjL  
 CString tip; i-&kUG_X  
 tip.LoadString(IDS_ICONTIP); Em _miU  
 data.hIcon=GetIcon(0); 'VF9j\a  
 data.hWnd=GetSafeHwnd(); \8F$85g  
 strcpy(data.szTip,tip); _G'.VSGH  
 data.uCallbackMessage=IDM_SHELL; gk] r:p<O  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; GH:Au  
 data.uID=98; dd$\Q  
 Shell_NotifyIcon(NIM_ADD,&data); [ ra [~  
 ShowWindow(SW_HIDE); :l*wf/&z  
 bTray=TRUE; 9 -TFyZYU  
} J.O;c5wL  
7dU X(D,?  
void CCaptureDlg::DeleteIcon() B`KpaE]  
{ 8qBw;A)  
 NOTIFYICONDATA data; _;0:wXib =  
 data.cbSize=sizeof(NOTIFYICONDATA); AY *  
 data.hWnd=GetSafeHwnd(); Z/ThY bk  
 data.uID=98; EzthRe9  
 Shell_NotifyIcon(NIM_DELETE,&data); GU"MuW`u2  
 ShowWindow(SW_SHOW); 'l<kY\I!%  
 SetForegroundWindow(); [x)BQX'  
 ShowWindow(SW_SHOWNORMAL); F]Y Pq  
 bTray=FALSE; VSP[G ,J.  
} 3-_4p8OK  
kW/ksz0)  
void CCaptureDlg::OnChange() $]%k <|X  
{ vmmu[v  
 RegisterHotkey(); Wje7fv  
} l sUQ7%f  
1bvL  
BOOL CCaptureDlg::RegisterHotkey() 9`vse>,-hg  
{ 2@A7i<p  
 UpdateData(); ;N4mR6  
 UCHAR mask=0; o]k[l ;  
 UCHAR key=0; -4HI9Czts  
 if(m_bControl) W;0_@!?mr}  
  mask|=4; U;{VL!  
 if(m_bAlt) I:Z38xz-[  
  mask|=2; j&#p&`B  
 if(m_bShift) 4V[+6EV  
  mask|=1; sb8SG_c.  
  key=Key_Table[m_Key.GetCurSel()]; Zi|'lHr  
 if(bRegistered){ H)(Jjk-O  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); %Cm4a49FNi  
  bRegistered=FALSE; L- =^GNh  
 } '3<YZWS  
 cMask=mask; i44KTC"sB  
 cKey=key; [;tbNVZK  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); =>BT]WK>  
 return bRegistered; |NM.-@1  
} }*+ca>K  
U8.DPRa  
  四、小结 5@Rf]'1B0  
0ED(e1K#B  
  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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