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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`|qFG<  
  .Dm{mV@*T  
  一、实现方法 ]_?y[@ZP  
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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: Xhi?b|  
5b,98Q  
#pragma data_seg("shareddata") '_)t R;s  
HHOOK hHook =NULL; //钩子句柄 c &HoS  
UINT nHookCount =0; //挂接的程序数目 &UR/Txnu  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 U:r2hqegd  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 OT i3T1&  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey BP$#a #  
static int KeyCount =0; "+&<Qd2  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 =&b[V"  
#pragma data_seg() #4M0%rN  
&/9oi_r%r  
  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。 t^hkGYj!2  
/3]|B%W9  
  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: 3)Y:c2  
<.ky1aex7  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR *q{UipZbx  
cKey,UCHAR cMask) $Stu-l1e a  
{ $P3nP=mf  
 BOOL bAdded=FALSE; [3Rj?z"S  
 for(int index=0;index<MAX_KEY;index++){ 5b p"dIe  
  if(hCallWnd[index]==0){ &v,p_'k  
   hCallWnd[index]=hWnd; U@nwSfp:G  
   HotKey[index]=cKey; 7g9^Jn  
   HotKeyMask[index]=cMask; Ziimz}WHF  
   bAdded=TRUE; ".f:R9-  
   KeyCount++; 3G^Ed)JvE  
   break; *.g?y6d  
  } EB<q.  
 } m{c#cR  
 return bAdded; -::%9D}P|  
} CN(4;-so)  
//删除热键 46Nf|~  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) UmX[=D|  
{ Oy$BR <\  
 BOOL bRemoved=FALSE; i:ZA{hA`c  
 for(int index=0;index<MAX_KEY;index++){ VsEAo  
  if(hCallWnd[index]==hWnd){ QE2^.|d{  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 1o>R\g3  
    hCallWnd[index]=NULL; S8m&Rj3O&  
    HotKey[index]=0; (p=GR#  
    HotKeyMask[index]=0; )7g_v*  
    bRemoved=TRUE; N1~$ +  
    KeyCount--; nD\os[ 3  
    break; ~e9INZe-j  
   } q}Z T?Xk?  
  } ( y*X8  
 } W+e*(W|d6  
 return bRemoved; +z0}{,HX  
} j9'XZq}  
9X9zIh]JV  
u 7Y< ~  
  DLL中的钩子函数如下: O7'3}P;  
6xh#;+e }  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) fMPq  
{ A5<Z&Y[  
 BOOL bProcessed=FALSE; `sy &dyM  
 if(HC_ACTION==nCode) 3}{5 X'  
 { h\*rv5\M  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 '. Hp*9R  
   switch(wParam) =v$s+`cP  
   {  %yM' Z[-  
    case VK_MENU: vr;Br-8  
     MaskBits&=~ALTBIT; J?quYlS  
     break; *jw$d8q2  
    case VK_CONTROL: Kx 185Q'W  
     MaskBits&=~CTRLBIT; Q;ZHx.ye{  
     break; tW"ptU^9)  
    case VK_SHIFT: }9udo,RWu  
     MaskBits&=~SHIFTBIT; 0k 0c   
     break; ]!G>8Rc  
    default: //judge the key and send message [Pwo,L,)  
     break; :#:O(K1PW  
   } 7h9[-d6  
   for(int index=0;index<MAX_KEY;index++){ m2q;^o:J  
    if(hCallWnd[index]==NULL)  Am%a4{b  
     continue; ^Xy$is3  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) `}8@[iB'  
    { dwbY"t[9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); +<WRB\W  
     bProcessed=TRUE; p/WH#4Xdr  
    } |k .M+  
   } hf+/kc!>i  
  } 3^R][;  
  else if((lParam&0xc000ffff)==1){ //有键按下 '=,rb  
   switch(wParam) QB3d7e)8>  
   { h3]@M$Y[  
    case VK_MENU: Hl2f`GZ   
     MaskBits|=ALTBIT; .1}rzh}8  
     break; fJ&<iD)6  
    case VK_CONTROL: k CW!m  
     MaskBits|=CTRLBIT;  J"Y   
     break; OT}Yr9h4  
    case VK_SHIFT: 7hN6IP*so  
     MaskBits|=SHIFTBIT; Pm#x?1rAj  
     break; Q_]!an(  
    default: //judge the key and send message WW [`E  
     break; }]g95xT  
   } <qq'h  
   for(int index=0;index<MAX_KEY;index++){ `mKlv~$1^  
    if(hCallWnd[index]==NULL) 2 ]DCF  
     continue; ;Up'~BP(  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) {GQ Aa  
    { %eJ\d?nw  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gN, k/U8  
     bProcessed=TRUE; Ck3QrfM  
    } ~X~xE]1o|U  
   } 65waq~#  
  } a81!~1A  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $(KIB82&  
   for(int index=0;index<MAX_KEY;index++){ B-\,2rCCZ  
    if(hCallWnd[index]==NULL) /zl3&~4  
     continue; x5fgF;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) % UW=:  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); oN[Fza>  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 -}_cO|kk  
   } '0CXHjZN  
  } MK-a $~<  
 } W>}Qer4  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !cN?SGafZI  
} W$JY M3!  
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  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: Y)Znb;`?a  
d7W%zg\T  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 9Qt)m fqM  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2I]]WBW#:  
B@cJ\  
  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: Z7/vrME6  
CF3E]dt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) j<l#qho{h  
{ 5E]UI YAkV  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) \#\`!L[1  
 { |u^)RB  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 (j8GiJ]{L,  
  SaveBmp(); q4sl=`L5Sp  
  return FALSE; HCX!P4Hj  
 } K,x$c %  
 …… //其它处理及默认处理 tXf}jU}  
} vQ:x% =]  
4r_!>['`"  
y!7B,  
  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。 C+/Eqq^(  
Fy 4Tvg  
  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。 " t5 +*  
_, \y2&KT  
  二、编程步骤 -]Q3/"Q  
K H>Sc3p  
  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"; Jq# [uX  
}7iUagN  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; pGY [f@_x-  
t *o7,  
  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; NlA*\vco  
nHI(V-E2:H  
  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; gb]h OB7g  
.>k=A|3G  
  5、 添加代码,编译运行程序。 *w=z~Jq^R"  
AiY|O S3R  
三、程序代码 @b]VCv0*f%  
hA@zoIoe  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL sk#9x`Rw  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) h^['rmd  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ |)^clkuGX  
#if _MSC_VER > 1000 Bp &6x;MJf  
#pragma once zXQVUhL6  
#endif // _MSC_VER > 1000 ~;}\zKQKE  
#ifndef __AFXWIN_H__ U!x0,sr  
#error include 'stdafx.h' before including this file for PCH $ b4*/vMr  
#endif 'n>K^rA  
#include "resource.h" // main symbols F\;2 i:(  
class CHookApp : public CWinApp +<gg  
{ 0xN!DvCg>.  
 public: IS-}:~Pi  
  CHookApp(); \.5F](:  
  // Overrides  NI^{$QMj  
  // ClassWizard generated virtual function overrides dI!8S  
  //{{AFX_VIRTUAL(CHookApp) j0AwL7  
 public: R_maNfS]Z  
  virtual BOOL InitInstance(); jh>N_cp  
  virtual int ExitInstance(); (viWY  
  //}}AFX_VIRTUAL [C~fBf5  
  //{{AFX_MSG(CHookApp) HB%K|&!+  
  // NOTE - the ClassWizard will add and remove member functions here. Og +)J9#  
  // DO NOT EDIT what you see in these blocks of generated code ! bk.*k~_  
  //}}AFX_MSG yGRR8F5>(  
  DECLARE_MESSAGE_MAP() ?vvG)nW  
}; WmNA5;<Q  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); [U swf3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); $Ru&>D#stK  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2v4W6R  
BOOL InitHotkey(); X) 8e4~(?  
BOOL UnInit(); *E.LP1xP  
#endif YDW|-HIF  
\Ps5H5Qk;  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. nkTYWw  
#include "stdafx.h" TM)u?t+[  
#include "hook.h" C(}^fJ6r  
#include <windowsx.h> ]{<saAmJC  
#ifdef _DEBUG { E^U6@  
#define new DEBUG_NEW Mw+v"l&mU  
#undef THIS_FILE sp^Wo7&g  
static char THIS_FILE[] = __FILE__; Sg_O?.r  
#endif KyjyjfIwH  
#define MAX_KEY 100 M%3Wy"YQ,n  
#define CTRLBIT 0x04 Cpe#[mE  
#define ALTBIT 0x02 QPX`l0V  
#define SHIFTBIT 0x01 as(;]  
#pragma data_seg("shareddata") dIvy!d2l  
HHOOK hHook =NULL; .8K6C]gw  
UINT nHookCount =0; Q<1L`_.>  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey X~Cq  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT qIz}$%!A  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 0 k9<&  
static int KeyCount =0; (#If1[L  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift P<vo;96JT  
#pragma data_seg() |U EC  
HINSTANCE hins; *Z; r B  
void VerifyWindow(); h D.)M  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) W tVf wC_  
//{{AFX_MSG_MAP(CHookApp) (vnoP< 0  
// NOTE - the ClassWizard will add and remove mapping macros here. Y([d;_#P  
// DO NOT EDIT what you see in these blocks of generated code! >nK%^T  
//}}AFX_MSG_MAP < <sE`>)  
END_MESSAGE_MAP() '$?du~L-  
`w+1C&>^[  
CHookApp::CHookApp() I>aGp|4  
{ JCD?qeTg  
 // TODO: add construction code here, #3+~.,X9  
 // Place all significant initialization in InitInstance y6FKg)  
} 6} #"qqnx  
lH6fvz  
CHookApp theApp; C `6S}f,  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) zqf[Z3  
{ j`9Qzi1  
 BOOL bProcessed=FALSE; toIYE*ocv=  
 if(HC_ACTION==nCode) nA+F  
 { 'g hys1H  
  if((lParam&0xc0000000)==0xc0000000){// Key up G|*G9nQ  
   switch(wParam) tF%QH[  
   { [,b)YjO~Xd  
    case VK_MENU: |z*>ixK  
     MaskBits&=~ALTBIT; , D"]y~~I5  
     break; l `R KqT+  
    case VK_CONTROL: iD714+N(  
     MaskBits&=~CTRLBIT; \<V)-eB   
     break; d@ (vg  
    case VK_SHIFT: 1qZG`Vz  
     MaskBits&=~SHIFTBIT; (A4&k{C_  
     break; R5kH0{zM  
    default: //judge the key and send message RX>2~^  
     break; vxVOcO9<  
   } $DE&J4K  
   for(int index=0;index<MAX_KEY;index++){ O|e}   
    if(hCallWnd[index]==NULL) Sc_5FX\Yx  
     continue; d}+W"j;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^{[[Z.&R?  
    { esI'"hVJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); t^U^Tr  
     bProcessed=TRUE; gr+Pl>C{  
    } QC7k~I8  
   } 7n&yv9"  
  } ~OCZz$qA  
  else if((lParam&0xc000ffff)==1){ //Key down `0@z"D5c  
   switch(wParam) QNg\4%  
   { no&-YktP}  
    case VK_MENU: H1&RI4XC  
     MaskBits|=ALTBIT; taDQ65  
     break; 0OWL  
    case VK_CONTROL: -?fR|[\[U  
     MaskBits|=CTRLBIT; o;J;k_[MX  
     break; n&d/?aJ7a\  
    case VK_SHIFT: moG~S]  
     MaskBits|=SHIFTBIT; T 6HU*(  
     break; wOg,SMiq  
    default: //judge the key and send message JA6";fl;  
     break; [h-norB((  
   } GFL-.? 0  
   for(int index=0;index<MAX_KEY;index++) <\aU"_D   
   {  zy>}L #  
    if(hCallWnd[index]==NULL) Pa&4)OD  
     continue; -nR\,+N  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) !y*oF{RZ  
    { : Ss3ck*=  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); rQj~[Y.c  
     bProcessed=TRUE; ChE_unw  
    } G Y-M.|%  
   } 6+PGwCS  
  } 38Efp$)  
  if(!bProcessed){ hW' HT  
   for(int index=0;index<MAX_KEY;index++){ <|H ?gfM  
    if(hCallWnd[index]==NULL) } 0{B  
     continue; % rcFT_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))  `{}@@]  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); H(> M   
   } !G+u j(  
  } %),!2_ x~  
 } o^GC=Aca`  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); fA^SD"xf  
} Ef,Cd[]b  
o0`q#>7!_b  
BOOL InitHotkey() &yLc1#H  
{ 7#pZa.B)k  
 if(hHook!=NULL){ VQ<5%+  
  nHookCount++; d~`-AC+  
  return TRUE; ikHOqJ-,m  
 } 8*Zvr&B,G  
 else [`nY2[A$  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); :hP58 }Q$  
  if(hHook!=NULL) }cW#045es  
   nHookCount++; -3vh!JMN  
  return (hHook!=NULL); {D,RU8&  
} NvHN -^2  
BOOL UnInit() sN]Z #7  
{ gZ`DT  
 if(nHookCount>1){ )4ncutb  
  nHookCount--; WG%2<Q^  
  return TRUE; &7Kb]Ti  
 } 2.qpt'p[  
 BOOL unhooked = UnhookWindowsHookEx(hHook); C #aFc01B  
 if(unhooked==TRUE){ f3n~{a,[  
  nHookCount=0; /qXzOd  
  hHook=NULL; 5^2TfG9  
 } }Vl^EAR  
 return unhooked; 0b++ 17aV  
} TQ-KkH}y  
OjATSmZ@@  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 5/(sjMB  
{ !. eAOuq  
 BOOL bAdded=FALSE; b1)\Zi  
 for(int index=0;index<MAX_KEY;index++){ }`]]b+_b>@  
  if(hCallWnd[index]==0){ ,`)OEI|1d  
   hCallWnd[index]=hWnd; ]_ #SAhOR)  
   HotKey[index]=cKey; 6t$N78U  
   HotKeyMask[index]=cMask; vZk9gGjk  
   bAdded=TRUE; 7LdzZS0OM  
   KeyCount++; G?ZC 9w]rA  
   break; !Bj^i cR  
  } PUKVn+h  
 } 0_HJ.g!  
 return bAdded; ^O \q3HA_4  
} O{BW;Deo  
pN+I]NgQ  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) qK-qcPLsl  
{ c(&AnIlS  
 BOOL bRemoved=FALSE; |0]YA  
 for(int index=0;index<MAX_KEY;index++){ U!NI_uk  
  if(hCallWnd[index]==hWnd){ ==`Pb  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ k.Gl4 x  
    hCallWnd[index]=NULL; f}blB?e  
    HotKey[index]=0; Z9f/-|r5  
    HotKeyMask[index]=0; b~9`]+  
    bRemoved=TRUE; )w3 ,   
    KeyCount--; IywiCMjH  
    break; {83C,C-  
   } SctJxY(}!  
  } xy vND  
 } !G[f[u4Zg  
 return bRemoved; [9J:bD  
} 6+ ?wnp-  
X&.:H~xS+  
void VerifyWindow() Q-3r}jJe  
{ ajGcKyj8i  
 for(int i=0;i<MAX_KEY;i++){ FvAbh]/4  
  if(hCallWnd!=NULL){ s!aO*\[<h  
   if(!IsWindow(hCallWnd)){ {dBB{.hX  
    hCallWnd=NULL; ^8Z@^M&O"  
    HotKey=0; |zh +  
    HotKeyMask=0; |+u+)C  
    KeyCount--; ot0U-G(  
   } ovbEmb  
  } .Nk}Z9L]k  
 } Ej{+U  
} !. p  
hAlPl<BO#V  
BOOL CHookApp::InitInstance() v` $%G  
{ W oWBs)E  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); FN>L7 *,0  
 hins=AfxGetInstanceHandle(); df^0{gNHx  
 InitHotkey(); OgQntj:%lN  
 return CWinApp::InitInstance(); 9lKRL'QR  
} }|SIHz!R  
6-tiRk~  
int CHookApp::ExitInstance() %uj[`  
{ .(JE-upJ"  
 VerifyWindow(); hRa\1Jt>a  
 UnInit(); *^uGvJXF  
 return CWinApp::ExitInstance(); D$QGLI9(  
} 3Fgz)*Gu]  
%n4@[fG%K  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file  k~{Fnkt  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) O/(3 87=U  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ D/e&7^iK  
#if _MSC_VER > 1000 iQu^|,tHEM  
#pragma once |^ ?`Q.|c$  
#endif // _MSC_VER > 1000 y2GQN:X  
(X*'y*:  
class CCaptureDlg : public CDialog R08&cd#$  
{ p?}f|mQS)  
 // Construction z1kBNOr  
 public: g ,`F<CF9  
  BOOL bTray; QjI#Cs}w  
  BOOL bRegistered; 'y< t/qo  
  BOOL RegisterHotkey(); bB y'v/  
  UCHAR cKey; Ywmyr[Uh'  
  UCHAR cMask; JaA&eT|  
  void DeleteIcon(); axOi 5  
  void AddIcon(); $y8mK|3.3u  
  UINT nCount; &ycjSBK  
  void SaveBmp(); 0T(O'v}.  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor c!.=%QY  
  // Dialog Data 0h^uOA; c  
  //{{AFX_DATA(CCaptureDlg) vf6`s\6  
  enum { IDD = IDD_CAPTURE_DIALOG }; 5QKRI)XpZ  
  CComboBox m_Key; E2h(w_l  
  BOOL m_bControl; y2U/$%B)G  
  BOOL m_bAlt; : 2_ 0L  
  BOOL m_bShift; =n)JJS94  
  CString m_Path; F ~*zC`>Y  
  CString m_Number; p@vpd  
  //}}AFX_DATA " 98/HzR  
  // ClassWizard generated virtual function overrides K1/ U (A  
  //{{AFX_VIRTUAL(CCaptureDlg) uFz/PDOZ@  
 public: JvKO $^  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 2XzF k_6H  
 protected: $K`_ K#A  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 4A;[s m^f  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); dUI3erO  
  //}}AFX_VIRTUAL Rk}\)r\  
  // Implementation t#a.}Jl  
 protected: cZ6?P`X  
  HICON m_hIcon; NAJ '><2  
  // Generated message map functions x6"/z  
  //{{AFX_MSG(CCaptureDlg) 1aBD^^Y  
  virtual BOOL OnInitDialog(); GVeL~Q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); B.V?s,U  
  afx_msg void OnPaint(); ^cB49s+{e  
  afx_msg HCURSOR OnQueryDragIcon(); Tw2Xe S  
  virtual void OnCancel(); JtSuD>H`"  
  afx_msg void OnAbout(); ?$UH9T9)  
  afx_msg void OnBrowse(); lt }r}HM+  
  afx_msg void OnChange(); CR%D\I$o  
 //}}AFX_MSG n>u.3w L  
 DECLARE_MESSAGE_MAP() Q1aHIc  
}; _2NN 1/F5  
#endif <sm#D"GpP  
AmP#'U5  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ue,#, 3{m  
#include "stdafx.h" -L+\y\F  
#include "Capture.h" OD{5m(JwL  
#include "CaptureDlg.h" d1UVvyH  
#include <windowsx.h> P h9Hg'  
#pragma comment(lib,"hook.lib") oxUE79  
#ifdef _DEBUG &r&;<Q  
#define new DEBUG_NEW V*~1,6N [  
#undef THIS_FILE ,h3269$J  
static char THIS_FILE[] = __FILE__; !x`;>0  
#endif ,O$Z,J4VL  
#define IDM_SHELL WM_USER+1 );0<Odw%.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); d\v$%0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); elN{7:  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 9 yh9HE  
class CAboutDlg : public CDialog *!._Ais,\  
{ 6XQ*:N/4al  
 public: W Atg  
  CAboutDlg(); j9{O0[v  
  // Dialog Data ^>3tYg&7  
  //{{AFX_DATA(CAboutDlg) L4MxU 2  
  enum { IDD = IDD_ABOUTBOX }; xnJjCEZ  
  //}}AFX_DATA i58ZV`Rk`  
  // ClassWizard generated virtual function overrides bRx2 c  
  //{{AFX_VIRTUAL(CAboutDlg) >+yqjXRzm  
 protected: F% F c+?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support lt@  
  //}}AFX_VIRTUAL /X(@|tk:  
  // Implementation @N,:x\  
 protected: N BV}4  
  //{{AFX_MSG(CAboutDlg) _<Hb(z  
  //}}AFX_MSG kWzuz#  
  DECLARE_MESSAGE_MAP() j lYD~)  
}; ..vSL  
o?:;8]sr!  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) ;X?Ah  
{ TYs+XJ'Xj  
 //{{AFX_DATA_INIT(CAboutDlg) ]jHh7> D  
 //}}AFX_DATA_INIT <dju6k7uz  
} ;cM8EU^.  
1x~%Ydy  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) $sA,$x:^xI  
{ 8[6ny=S`  
 CDialog::DoDataExchange(pDX); 7Vz[ji  
 //{{AFX_DATA_MAP(CAboutDlg) 2rK-X_}  
 //}}AFX_DATA_MAP h Jfa_  
} .8u$z`j  
d$2@,  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) [VY8?y  
 //{{AFX_MSG_MAP(CAboutDlg) &/b? I `  
 // No message handlers Nrab*K(][  
 //}}AFX_MSG_MAP  ET >S  
END_MESSAGE_MAP() w.4u=e >Z4  
\zk?$'d  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) :FX'[7;p  
: CDialog(CCaptureDlg::IDD, pParent) +-Z"H)  
{ OaD Alrm  
 //{{AFX_DATA_INIT(CCaptureDlg) 6F|Hg2tpz  
  m_bControl = FALSE; DFt=%aV[  
  m_bAlt = FALSE; {0NsDi>(2  
  m_bShift = FALSE; {-xi0D/Y;  
  m_Path = _T("c:\\"); 5~_eN  
  m_Number = _T("0 picture captured."); an*]62l  
  nCount=0; m#5|J@]  
  bRegistered=FALSE; sD LVYD  
  bTray=FALSE; =oL8d 6nI  
 //}}AFX_DATA_INIT YtwmlIar`  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 %JP&ox|^&  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); (cOND/S  
} )LXoey!aZ  
v`[Tl  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) N0y;PVAGu  
{ J6@(X8w{j  
 CDialog::DoDataExchange(pDX); ^4xlZouCb  
 //{{AFX_DATA_MAP(CCaptureDlg) &&(4n?   
  DDX_Control(pDX, IDC_KEY, m_Key); %Y)PH-z  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); e.)yV'%L  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }};j2  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 1kB'sc3N!  
  DDX_Text(pDX, IDC_PATH, m_Path); x&hvFG3  
  DDX_Text(pDX, IDC_NUMBER, m_Number); "e1{V8 4  
 //}}AFX_DATA_MAP hj^G} 4  
} E5,%J  
s)=!2AY  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) VfL]O8P>  
//{{AFX_MSG_MAP(CCaptureDlg) 8Pr&F  
 ON_WM_SYSCOMMAND() FbNH+?  
 ON_WM_PAINT() lfU"SSQ  
 ON_WM_QUERYDRAGICON() N>&{Wl'y\  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) _ 6+,R  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) "?2  
 ON_BN_CLICKED(ID_CHANGE, OnChange) aH5t.x79b  
//}}AFX_MSG_MAP I3}HNGvU  
END_MESSAGE_MAP() ifJv~asp   
J)7,&Gc6  
BOOL CCaptureDlg::OnInitDialog() p=8M0k  
{ _Ewy^;S%L  
 CDialog::OnInitDialog(); xh+AZ3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ! /|0:QQi  
 ASSERT(IDM_ABOUTBOX < 0xF000); #hy5c,}>  
 CMenu* pSysMenu = GetSystemMenu(FALSE); ugIm:bg&  
 if (pSysMenu != NULL) [M7iJcwt  
 {  |0C|$2  
  CString strAboutMenu; Z`-)1!  
  strAboutMenu.LoadString(IDS_ABOUTBOX); I,],?DQX2)  
  if (!strAboutMenu.IsEmpty()) 6i9Q ,4~  
  { fd!pM4"0  
   pSysMenu->AppendMenu(MF_SEPARATOR); t7C!}'g&'  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); b:}wR*Adc  
  } *@bg/S K%  
 } N27K  
 SetIcon(m_hIcon, TRUE); // Set big icon bGMeBj"R  
 SetIcon(m_hIcon, FALSE); // Set small icon uZqu xu.  
 m_Key.SetCurSel(0); *#prSS  
 RegisterHotkey(); 0,vj,ic*WX  
 CMenu* pMenu=GetSystemMenu(FALSE); ]HNT(w@  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Mv7w5vTl  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); eLDL  "L  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ^td!g1"<  
 return TRUE; // return TRUE unless you set the focus to a control YobC'c\~9  
} .  T6_N  
WQIM2_=M  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3%vx' 1h[  
{ y]E)2:B[d  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) gNEzlx8A  
 { T;:',T[G  
  CAboutDlg dlgAbout; 0btmao-  
  dlgAbout.DoModal(); &|'Kut?8  
 } AXNszS%4  
 else By"^ Z`EP4  
 { WRLu 3nBx  
  CDialog::OnSysCommand(nID, lParam); (_%JF[W  
 } tvj'{W  
} lk+=2 6>  
6bRQL}[  
void CCaptureDlg::OnPaint() B Z\EqB  
{ W)$|Hm:H  
 if (IsIconic()) 5x1%oC  
 { JX2 |  
  CPaintDC dc(this); // device context for painting b]so9aCz  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); +X%fcoc  
  // Center icon in client rectangle fUL{c,7xda  
  int cxIcon = GetSystemMetrics(SM_CXICON); U"%8"G0)  
  int cyIcon = GetSystemMetrics(SM_CYICON); dp//p)B>  
  CRect rect; psyH?&T  
  GetClientRect(&rect); 0+2Matk>.  
  int x = (rect.Width() - cxIcon + 1) / 2; "u,~yxYWl  
  int y = (rect.Height() - cyIcon + 1) / 2; O w($\,  
  // Draw the icon g1hg`qBBW  
  dc.DrawIcon(x, y, m_hIcon); &23ss/  
 } COkLn)+0  
 else eLt Cxe  
 { 1CS]~1Yp:  
  CDialog::OnPaint(); PTI'N%W  
 } X/;"CM  
} R<0!?`b  
,39$iHk  
HCURSOR CCaptureDlg::OnQueryDragIcon() E3.W#=o  
{ e~2*> 5\:  
 return (HCURSOR) m_hIcon; y?R <g^A  
} fbx;-He!  
 1+i  
void CCaptureDlg::OnCancel() ++p& x{  
{ Fb<\(#t  
 if(bTray) ,rl <ye*&  
  DeleteIcon(); RfKxwo|M<  
  CDialog::OnCancel(); d,Dg"Z  
} Z#cU#)`y1  
7"CH\*%  
void CCaptureDlg::OnAbout() ~RR_[t2Z  
{ EH!EyNNb  
 CAboutDlg dlg; 5f`XFe$8  
 dlg.DoModal(); L&gEQDPgq|  
} Y;/=3T7An  
7i|hlk;  
void CCaptureDlg::OnBrowse() &<#BsFz  
{ Kn9=a-b?,  
 CString str; [>]VN)_J5  
 BROWSEINFO bi; %ucmJ-< y#  
 char name[MAX_PATH]; H R!>g  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); :PjUl  
 bi.hwndOwner=GetSafeHwnd(); G'}_ZUy#  
 bi.pszDisplayName=name; %Ty {1'o  
 bi.lpszTitle="Select folder"; kq.R(z+  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; F0ivL`  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 9q ,Jq B  
 if(idl==NULL) |Nd. '|g,  
  return; MIyLQ  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); v,.n/@s|X  
 str.ReleaseBuffer(); 1.d9{LO[-  
 m_Path=str; MPEBinE?  
 if(str.GetAt(str.GetLength()-1)!='\\') Nxs%~ wZ   
  m_Path+="\\"; ThQEQ6y  
 UpdateData(FALSE); `zsk*W1GA  
} \3Ald.EqtM  
@XG`D>%k  
void CCaptureDlg::SaveBmp() +sbacMfq  
{  [;LPeO  
 CDC dc; [Oy2&C  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); PM?Ri^55<L  
 CBitmap bm; KZ >"L  
 int Width=GetSystemMetrics(SM_CXSCREEN); tIy/QN_42  
 int Height=GetSystemMetrics(SM_CYSCREEN); K'rs9v"K|  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Nm:<rI,^  
 CDC tdc; (lck6v?h  
 tdc.CreateCompatibleDC(&dc); PQ#-.K  
 CBitmap*pOld=tdc.SelectObject(&bm); ,c %gwzU  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); I;m@cSJ|j  
 tdc.SelectObject(pOld); fF]&{b~wk  
 BITMAP btm; Gt%?[  
 bm.GetBitmap(&btm); vFvu8*0  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; C%7)sLWjJS  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); X1z0'gvh  
 BITMAPINFOHEADER bih; 4y}a,  
 bih.biBitCount=btm.bmBitsPixel; waq_d.  
 bih.biClrImportant=0; iU+,Jeu  
 bih.biClrUsed=0; -Aym+N9  
 bih.biCompression=0; 8JO\%DFJ  
 bih.biHeight=btm.bmHeight; G.E~&{5xQ  
 bih.biPlanes=1; 3LnyQ  
 bih.biSize=sizeof(BITMAPINFOHEADER); 9l^  
 bih.biSizeImage=size; M,U=zNPnk  
 bih.biWidth=btm.bmWidth; L$?~TY  
 bih.biXPelsPerMeter=0; Zu73x#pI  
 bih.biYPelsPerMeter=0; 3bL2fsn5  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); W oG  
 static int filecount=0; Oy`\8*Uy__  
 CString name; =xWW+w!r  
 name.Format("pict%04d.bmp",filecount++); dSD}NM  
 name=m_Path+name; 9 v3Nba  
 BITMAPFILEHEADER bfh; :;u]Y7  
 bfh.bfReserved1=bfh.bfReserved2=0; UlZ)|Ya<M  
 bfh.bfType=((WORD)('M'<< 8)|'B'); [ Zqg"`  
 bfh.bfSize=54+size; *8eh%3_$h  
 bfh.bfOffBits=54; <@ex})su  
 CFile bf; LzSusjEW@  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ b020U>)v  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 7 ,~Krzv  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); ,ui'^8{gK  
  bf.WriteHuge(lpData,size); WG=r? xE  
  bf.Close(); LO*a>9LI  
  nCount++; GT}#iM  
 } xfQ;5n  
 GlobalFreePtr(lpData); ` Z V'7|  
 if(nCount==1) U5%]nT"[]  
  m_Number.Format("%d picture captured.",nCount); \ bmboNe  
 else JM9Q]#'t  
  m_Number.Format("%d pictures captured.",nCount); -@?>nLQb  
  UpdateData(FALSE); bN %MT#X  
} ) G&3V  
UdgI<a~`k6  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Uy'ZL(2  
{ " yl"A4p S  
 if(pMsg -> message == WM_KEYDOWN) `X03Q[:q"[  
 { uXa}<=O  
  if(pMsg -> wParam == VK_ESCAPE) dOgM9P  
   return TRUE; I,Y^_(JW  
  if(pMsg -> wParam == VK_RETURN) ,(?4T~  
   return TRUE; cDol o1*  
 } |L-juT X9  
 return CDialog::PreTranslateMessage(pMsg); (D3m5fO  
}  .5r0%  
T1 .@Tbbt  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) K4L#%KUPW  
{ rxA)&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ NGGd6V%'-  
  SaveBmp(); !Bbwl-e`  
  return FALSE; PEhLzZX+  
} XYVeHP!  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 62E(=l  
 CMenu pop; I9&<:`  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); / UBAQ8TR  
 CMenu*pMenu=pop.GetSubMenu(0); DuZ]g#  
 pMenu->SetDefaultItem(ID_EXITICON); Rzj!~`&N  
 CPoint pt; {]N?DmF  
 GetCursorPos(&pt); [NDYJ'VGe  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 3+PM_c)Y  
 if(id==ID_EXITICON) OtqLigt&l  
  DeleteIcon(); \K=PIcH  
 else if(id==ID_EXIT) ZI]K+jza  
  OnCancel(); < VsZ$  
 return FALSE; E&v-(0  
} 82l";;n4p  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); gvt4'kp  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \"j1fAD!  
 AddIcon(); }('QIvq2  
 return res; 6% axbB  
} K?eo)|4)DB  
g 0=t9J  
void CCaptureDlg::AddIcon() !9Xex?et  
{ cne[-E  
 NOTIFYICONDATA data; JYU Ks~Qt  
 data.cbSize=sizeof(NOTIFYICONDATA); 5n#&Hjb*F0  
 CString tip; -^N '18:  
 tip.LoadString(IDS_ICONTIP); D]_\i[x  
 data.hIcon=GetIcon(0); EFOQ;q  
 data.hWnd=GetSafeHwnd(); wpmtv325  
 strcpy(data.szTip,tip); |Q+v6r(<zZ  
 data.uCallbackMessage=IDM_SHELL; p 1fnuN |,  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; (#BA{9T,^  
 data.uID=98; 6?~pjMV  
 Shell_NotifyIcon(NIM_ADD,&data); N|d@B{a(  
 ShowWindow(SW_HIDE); %%u4( '=  
 bTray=TRUE; LRgk9*@,  
} 94/}@<d-=  
o4795r,jz  
void CCaptureDlg::DeleteIcon() <VPtbM@(m  
{ :v48y.Ij7s  
 NOTIFYICONDATA data; jlZNANR3  
 data.cbSize=sizeof(NOTIFYICONDATA); 7MfvU|D[d/  
 data.hWnd=GetSafeHwnd(); Jl}7]cVq#  
 data.uID=98; ~=Sr0+vV  
 Shell_NotifyIcon(NIM_DELETE,&data); ;T(^riAEl  
 ShowWindow(SW_SHOW); g9.hR8X  
 SetForegroundWindow(); M?97F!\U  
 ShowWindow(SW_SHOWNORMAL); 8i"fhN3?Y  
 bTray=FALSE; Rh^$0Q*2  
} 2|EoP-K7  
5lbh "m=  
void CCaptureDlg::OnChange() fA5# 2P{  
{ %vzpp\t  
 RegisterHotkey(); jws(`mIf\  
} 1uE[ %M  
}zi6F.  
BOOL CCaptureDlg::RegisterHotkey() U)6JJv  
{ Yzz8:n  
 UpdateData(); x;/3_"$9>\  
 UCHAR mask=0; Kxn=iv^Ir  
 UCHAR key=0; kM@,^`&  
 if(m_bControl) ,.B8hr@H6-  
  mask|=4; v%w]Q B  
 if(m_bAlt) Z )I4U  
  mask|=2; sy?W\(x  
 if(m_bShift) lRq!|.C  
  mask|=1; hR2.w/2j  
  key=Key_Table[m_Key.GetCurSel()]; 9:WKG'E8a  
 if(bRegistered){ Ar_/9@n  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 12E"6E)  
  bRegistered=FALSE; WJWrLu92\U  
 } +iR ;D$w  
 cMask=mask; A_+ WY|#M  
 cKey=key; ?T"crX  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); muLTYgaM  
 return bRegistered; g}7B0 yo  
} :1I,:L  
3h>Ji1vV  
  四、小结 H+Wd#7l,  
!~#31kL&  
  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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