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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: Q.-*7h8  
  huFz97?y(  
  一、实现方法 e]+OO g&  
9>m%`DG*  
  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: iMP  
8``;0}'PC  
#pragma data_seg("shareddata") <~Q i67I  
HHOOK hHook =NULL; //钩子句柄 Z%o7f6P0IX  
UINT nHookCount =0; //挂接的程序数目 PY\PUMF>  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 BWPP5X9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 Lf}8qB#Y  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ?dy~ mob  
static int KeyCount =0; uPyVF-i  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 ^z1IN-Tm/  
#pragma data_seg()  aA*9,  
OTvROJP  
  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。 $j` $[tX6l  
( `' 8Ww  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: 6/ g%\ka  
ZwI 1* f  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR jrJR1npB  
cKey,UCHAR cMask) JV"NZvjN7d  
{ IFNWS,:  
 BOOL bAdded=FALSE; I8m:3fL"  
 for(int index=0;index<MAX_KEY;index++){ ^%bBW6eZ  
  if(hCallWnd[index]==0){ PB'0?b}fab  
   hCallWnd[index]=hWnd; J07O:cjyu  
   HotKey[index]=cKey; mLL$|  
   HotKeyMask[index]=cMask; J}g~uW  
   bAdded=TRUE; y%BX]~  
   KeyCount++; O;XG^s@5  
   break; G"s0GpvQ  
  } 7| YrdK<  
 } r((Tavn  
 return bAdded; _j#SpL'P  
} wvc>0?t'  
//删除热键 $N+6h#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "X1vZwK8N  
{ 97~K!'/^+y  
 BOOL bRemoved=FALSE; kl7A^0Qrz  
 for(int index=0;index<MAX_KEY;index++){ hq_~^/v\  
  if(hCallWnd[index]==hWnd){ 3P=w =~e  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ lglYJ,  
    hCallWnd[index]=NULL; /)#8)"`nT  
    HotKey[index]=0; :X>DkRP  
    HotKeyMask[index]=0; CMVS W6  
    bRemoved=TRUE; `| 9Ku  
    KeyCount--; jz:gr=* z  
    break; aiftlY  
   } o"_=K%9  
  } z]#hWfM4B:  
 } B4W\ t{  
 return bRemoved; "n?<2 wso  
} 6 DP[g8  
`.BR= ['O  
UmP'L!  
  DLL中的钩子函数如下: 2R@%Y/  
}=GM ?,7b  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) Ti= 3y497S  
{ "~$$  
 BOOL bProcessed=FALSE; 1kFjas `g  
 if(HC_ACTION==nCode) R_e)mkE  
 { g()m/KS<  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 >Q2). E  
   switch(wParam) R{3CW^1  
   {  it}-^3A M  
    case VK_MENU: LpWI>sNv  
     MaskBits&=~ALTBIT; H?:Jq\Ba0  
     break;  4#rAm"H  
    case VK_CONTROL: 7kz-V.  
     MaskBits&=~CTRLBIT; 960qvz!  
     break; ?SX_gYe9  
    case VK_SHIFT: 1r4,XSk  
     MaskBits&=~SHIFTBIT; * BOBH;s  
     break; ~mH+DV3  
    default: //judge the key and send message Jp ]T9W\  
     break; XVUf,N,  
   } $L{7%]7QC  
   for(int index=0;index<MAX_KEY;index++){ ^ }#f()  
    if(hCallWnd[index]==NULL) :R+],m il  
     continue; \C/z%Hf7-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) g _ M-F  
    { a!t V6H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); I'IB_YRL4  
     bProcessed=TRUE; a$+#V=bA  
    } oh&Y< d0  
   } XZO<dhZX:  
  } OV|Z=EwJ  
  else if((lParam&0xc000ffff)==1){ //有键按下 yX9B97XyC  
   switch(wParam) _i@x@:_l  
   { 1q!sKoJ<  
    case VK_MENU: M {xie  
     MaskBits|=ALTBIT; wItzcY1m  
     break; iQqbzOY  
    case VK_CONTROL: Zr"dOj$Jf  
     MaskBits|=CTRLBIT; (3fPt;U  
     break; . bG{T|  
    case VK_SHIFT: %FS;>;i?  
     MaskBits|=SHIFTBIT; 3wNN<R  
     break; 4(m3c<'P  
    default: //judge the key and send message *|'}v[{v^9  
     break; :&$Xe1)i]  
   } @,vv\M0)p  
   for(int index=0;index<MAX_KEY;index++){ OK\]*r  
    if(hCallWnd[index]==NULL) #NF+UJYJ&'  
     continue; # U`&jBU  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^ wQcB  
    { Q-Y@)Mf~?0  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); liG~y|  
     bProcessed=TRUE; LW?2}`+  
    } GTFl}t  
   } UCF[oO>v  
  } '%Dg{ zL  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ZOHRUm  
   for(int index=0;index<MAX_KEY;index++){ yS"0/Rm}  
    if(hCallWnd[index]==NULL) g =\13# F  
     continue; J~2 CD*v  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) r %xB8e9  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); j?J=w=.Nx  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 ^K>pT}u  
   }  * D3  
  } w{ m#Yt  
 } P rt#L8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); JWSq"N  
} gT7I9 (x!W  
$y4M#yv  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: JOHp?3"4  
9jjL9f_3  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); zf")|9j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g{&PrE'e9  
m2MPWy5s  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: "b;k.Fx  
Q2R>lzB  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 2^ kn5  
{ s.e y!ew  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) bl9E&B/  
 { G[B*TM6$  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Faw. GU  
  SaveBmp(); Q }8C  
  return FALSE; nTQ (JDf  
 } 2c*2\93>  
 …… //其它处理及默认处理 >,w P! ;dh  
} x k#*=  
v_.j/2U  
[ 1D)$"  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 *Ag,kW"  
33S`aJ  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 ~M(pCSJ[  
M{y|7e%K  
  二、编程步骤 CTh1;U20  
;W =by2x*  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; /XC;.dLA#  
4>d[qr*<  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; i@%L_[MtA  
O/'f$Zj36  
  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; aw;{<?*  
.|tQ=l@I  
  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; + >Fv*lux  
k0R, !F  
  5、 添加代码,编译运行程序。 qrOB_Nz  
C5d/)aC  
三、程序代码 an #jZ[  
d;IJ0xB+by  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL s"gKonwI2  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) H d96[Uo  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 4d,qXSKty  
#if _MSC_VER > 1000 h:eN>yW  
#pragma once w`2_6[,9  
#endif // _MSC_VER > 1000 Z{j!s6Y@{  
#ifndef __AFXWIN_H__ ](idf(j  
#error include 'stdafx.h' before including this file for PCH &n,xGIG  
#endif ' h0\4eu  
#include "resource.h" // main symbols /6?tgr  
class CHookApp : public CWinApp dpl"}+  
{ Vu^Q4Z  
 public: ajg7xF{l)  
  CHookApp(); |rG8E;>  
  // Overrides UzP@{?  
  // ClassWizard generated virtual function overrides sf=%l10Fk#  
  //{{AFX_VIRTUAL(CHookApp) 0EF,uRb  
 public: S8rW'}XJ=H  
  virtual BOOL InitInstance(); 89?3,k  
  virtual int ExitInstance(); `XFX`1  
  //}}AFX_VIRTUAL ~{kA) :  
  //{{AFX_MSG(CHookApp) Uj y6vgU;  
  // NOTE - the ClassWizard will add and remove member functions here. x`b~ZSNJ%  
  // DO NOT EDIT what you see in these blocks of generated code ! `Nxo0Q  
  //}}AFX_MSG Ej9/_0lt  
  DECLARE_MESSAGE_MAP() %`8KG(F^  
}; AiR%MD  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); c9>8IW  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); E0WrpGZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); uk>q\j  
BOOL InitHotkey(); T= iZ9w  
BOOL UnInit(); 7l4InR]  
#endif W_Ws3L1;N  
wt3Z?Pb  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. @p?b"?QaB  
#include "stdafx.h" 3(XHF3q  
#include "hook.h" Q7OnhGA  
#include <windowsx.h> S:"z<O  
#ifdef _DEBUG Vb"T],N1m  
#define new DEBUG_NEW o%9Ua9|RR  
#undef THIS_FILE k1@  A'n  
static char THIS_FILE[] = __FILE__; wjw<@A9  
#endif l=<F1Lz  
#define MAX_KEY 100 R  oF  
#define CTRLBIT 0x04 , .NG.Q4f  
#define ALTBIT 0x02 N23+1h  
#define SHIFTBIT 0x01 h|Teh-@A5  
#pragma data_seg("shareddata") _ cHV3cz  
HHOOK hHook =NULL; +)''l  
UINT nHookCount =0;  `i_L?C7  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey h<!khWFS  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT /I`!i K  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey -hJ>wGI  
static int KeyCount =0; HquB*=^xh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift nATfmUN L  
#pragma data_seg() \I`=JKYT  
HINSTANCE hins; LmT[N@>"  
void VerifyWindow(); 8{U]ATx'(  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) D+@/x{wX2  
//{{AFX_MSG_MAP(CHookApp) 7o 83|s.Bm  
// NOTE - the ClassWizard will add and remove mapping macros here. ?Sd~u1w8K  
// DO NOT EDIT what you see in these blocks of generated code! !Sr0Im0  
//}}AFX_MSG_MAP , L AJ  
END_MESSAGE_MAP() n+A'XBHk  
!D|pbzQc8  
CHookApp::CHookApp() _g/T H-;^  
{ /^es0$Co.  
 // TODO: add construction code here, 8 MACbLY  
 // Place all significant initialization in InitInstance WPh |~]by<  
} m}'t'l4 c  
6=`m   
CHookApp theApp; kxKnmB#m-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3T.M?UG>  
{ olQ8s *  
 BOOL bProcessed=FALSE; AD4L`0D  
 if(HC_ACTION==nCode) ^QL/m\zq@%  
 { OKLggim{  
  if((lParam&0xc0000000)==0xc0000000){// Key up j@_) F^12  
   switch(wParam) JWm^RQ  
   { @{$Cv"6769  
    case VK_MENU: \Z7([Gh  
     MaskBits&=~ALTBIT; o\:f9JL  
     break; =-s20mdj  
    case VK_CONTROL: f 7QUZb\  
     MaskBits&=~CTRLBIT; TG%hy"k  
     break; $'mB8 S  
    case VK_SHIFT: Ubos#hP  
     MaskBits&=~SHIFTBIT; gP hw.e""  
     break; +e3WwUx  
    default: //judge the key and send message po](6V  
     break; { ves@p>?  
   } |?t8M9[Z  
   for(int index=0;index<MAX_KEY;index++){ {dr&46$p  
    if(hCallWnd[index]==NULL) (8eNZ*+mO  
     continue; =='{[[J  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 1p "EE~ v  
    { i2%m}S;D9  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ,B/p1^;.  
     bProcessed=TRUE; '2q xcco  
    } -aeo7C  
   } #SLxNAH  
  } S&)) 0d  
  else if((lParam&0xc000ffff)==1){ //Key down FsPDWy&x  
   switch(wParam) 4+?ZTc(  
   { 6L`+ z  
    case VK_MENU: 1&dsQ, VDl  
     MaskBits|=ALTBIT; Hk~ gcG  
     break; UEYM;$_@4o  
    case VK_CONTROL: "VVR#H}{  
     MaskBits|=CTRLBIT; ,IZxlf%  
     break; $CYpO}u#  
    case VK_SHIFT: Wj{Rp{}3  
     MaskBits|=SHIFTBIT; i,b7Ft:F&  
     break; ^@5ui;JV  
    default: //judge the key and send message uW-- nXMs  
     break; _Ag/gu2-?  
   } AL$ Ty  
   for(int index=0;index<MAX_KEY;index++) |I^Jn@Mq:  
   { ;>8TNB e!  
    if(hCallWnd[index]==NULL) OFL+Q~~C  
     continue; *Wo$ $T  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) % oL&~6l$  
    { f]6` GsE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); P(i2bbU  
     bProcessed=TRUE; ?;#3U5$v  
    } _(kwD^x6O{  
   } [ *a>{sO[  
  } }br<2?y,  
  if(!bProcessed){ o/[yA3^  
   for(int index=0;index<MAX_KEY;index++){ wj5s5dH  
    if(hCallWnd[index]==NULL) T]Td4T!  
     continue; qsRfG~Cg  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) "91At b;hJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); W]Y!ZfGnN  
   } LW 3J$Am  
  } }(%}"%$  
 } h+u|MdOY\  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); \V- Y,!~5  
} it|:P  
e^Wv*OD'  
BOOL InitHotkey() .O-DVW Cm  
{ 1~u\]Zi=D  
 if(hHook!=NULL){ Ty|c@X  
  nHookCount++; SR8Kzk{  
  return TRUE; #2'&=?J1r  
 } Py0 i%pZ  
 else )n[Mh!mn  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Y'%I at(z  
  if(hHook!=NULL) iZUz6  
   nHookCount++; [)6E) E`_e  
  return (hHook!=NULL); @' :um  
} n ~i4yn=  
BOOL UnInit() 8jGoU 9  
{ kc']g:*]Y  
 if(nHookCount>1){ WK)k-A^q  
  nHookCount--; 4qcIoO  
  return TRUE; x]+KO)I  
 } Y +yvv{01  
 BOOL unhooked = UnhookWindowsHookEx(hHook); n.UM+2G  
 if(unhooked==TRUE){ !4cdP2^P  
  nHookCount=0; OxGCpbh*7o  
  hHook=NULL; [Et\~'2w8=  
 } Z5a@fWU  
 return unhooked; 1% %Tm"  
} 7Bd_/A($  
kL2sJX+  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) !e"m*S.(6{  
{ Ijro;rsEKM  
 BOOL bAdded=FALSE; (lsod#wEMg  
 for(int index=0;index<MAX_KEY;index++){ 7TY"{? ~O5  
  if(hCallWnd[index]==0){ #l% \}OC  
   hCallWnd[index]=hWnd; ouZ9oy(}a  
   HotKey[index]=cKey; %9)J-B  
   HotKeyMask[index]=cMask; gCI'YEx  
   bAdded=TRUE; &: 8&;vk  
   KeyCount++; "$;:dfrU  
   break; PH &ms  
  } $^ dk>Hj>4  
 } k8>^dZub  
 return bAdded; rGL{g&_  
} ^S2} 0N f  
ew['9  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 1vudT&  
{ <$6E r  
 BOOL bRemoved=FALSE; mU>* NP(L  
 for(int index=0;index<MAX_KEY;index++){ kakWXGeR  
  if(hCallWnd[index]==hWnd){ $gK>R5^G>  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ BQf+1 Ly&  
    hCallWnd[index]=NULL; w~?eX/;  
    HotKey[index]=0; r_RTtS#  
    HotKeyMask[index]=0; h!%`odl%  
    bRemoved=TRUE; 640V&<+v  
    KeyCount--; o[6"XJ  
    break; XYTcG;_z  
   } HhH'\-[t  
  } D+PUi!  
 }  Jl,x~d  
 return bRemoved; XKIJ6M~5k  
} DdBr Jx  
YZ P  
void VerifyWindow() q2i~<;Z)9  
{ _J;a[Ky+[  
 for(int i=0;i<MAX_KEY;i++){ Hf|:A(vCx  
  if(hCallWnd!=NULL){ w2AWdO6  
   if(!IsWindow(hCallWnd)){ @6 `@.iZ  
    hCallWnd=NULL; +c_CYkHJ/  
    HotKey=0; !Ve3:OZ.nO  
    HotKeyMask=0; xWV7#Z7  
    KeyCount--; G<1mj!{Vp  
   } >(a_9l;q  
  } Xq^{P2\w1  
 } " N4]e/.V  
} V#KM~3e  
SJ@_eir\o  
BOOL CHookApp::InitInstance() p4_uY7^6  
{ `"4EE}eQc  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); AOUO',v  
 hins=AfxGetInstanceHandle(); (E[hl  
 InitHotkey(); &p/k VM  
 return CWinApp::InitInstance(); >@iV!!  
} biK.HL\V  
cXH?'q 'vZ  
int CHookApp::ExitInstance() Pw.+DA  
{ 3|3lUU\I  
 VerifyWindow();  }"tYb6*  
 UnInit(); Vd~k4  
 return CWinApp::ExitInstance(); +N:%`9}2V  
} Zv7)+ Q  
=v9;HPiO  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file SBt: `,  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) inrL'z   
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ %)V3QnBO  
#if _MSC_VER > 1000 HrxEC)V6#  
#pragma once 5~QB.m,>  
#endif // _MSC_VER > 1000 RL9P:] ^  
U"Oq85vY  
class CCaptureDlg : public CDialog 7]bq s"t  
{ 0T;WN$W|  
 // Construction &Y$rVBgQ  
 public: H\vO0 <X  
  BOOL bTray; 5H2|:GzUc  
  BOOL bRegistered; )G&OX  
  BOOL RegisterHotkey(); Kfl+8UR5=  
  UCHAR cKey; =QRZ(2Wq  
  UCHAR cMask; ZS]e}]Zwp  
  void DeleteIcon(); ESI}+  
  void AddIcon(); D%v yO_k  
  UINT nCount; ,;y^|X  
  void SaveBmp(); o 8U2vMH  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 'Ud5;?{  
  // Dialog Data zFIKB9NUn  
  //{{AFX_DATA(CCaptureDlg) ]=Q'1%  
  enum { IDD = IDD_CAPTURE_DIALOG }; 0kfw8Lon  
  CComboBox m_Key; [U0c   
  BOOL m_bControl; 50A_+f.7%  
  BOOL m_bAlt; 0Jr< >7Q1  
  BOOL m_bShift; X)+N>8o?N  
  CString m_Path; ^xrR3m*d  
  CString m_Number; &-A 7%"  
  //}}AFX_DATA 1;V5b+b  
  // ClassWizard generated virtual function overrides l?~h_8&fT  
  //{{AFX_VIRTUAL(CCaptureDlg) 6G],t)<A'-  
 public: :nt%z0_  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 3-D!ZS&  
 protected: =%p{ " <  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B^{DCHu/  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); sYzG_* )  
  //}}AFX_VIRTUAL &V L<Rx  
  // Implementation .Pi67Kj,  
 protected: >Ko )Z&j9W  
  HICON m_hIcon; rYJvI  
  // Generated message map functions TXM.,5Dx\  
  //{{AFX_MSG(CCaptureDlg) bUNp>H>L  
  virtual BOOL OnInitDialog(); ^ 9i^Ci9  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Oc>-jhx?  
  afx_msg void OnPaint(); b;{C1aa>}  
  afx_msg HCURSOR OnQueryDragIcon(); I$&/?ns@O  
  virtual void OnCancel(); PhQD}|S  
  afx_msg void OnAbout(); M}>q>  
  afx_msg void OnBrowse(); JQqDUd  
  afx_msg void OnChange(); >vhyKq|g<  
 //}}AFX_MSG iy 5  
 DECLARE_MESSAGE_MAP() ZpyRvDz  
}; tznT*EQr  
#endif jWz-7BO  
\?Z dUY  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file U&NOf;h$  
#include "stdafx.h" nJnan,`W  
#include "Capture.h" 7>'F=}6[Y  
#include "CaptureDlg.h" g=.5*'Xlp  
#include <windowsx.h> *HRRv.iQ  
#pragma comment(lib,"hook.lib") lMP7o&  
#ifdef _DEBUG )Jc>l;G(M  
#define new DEBUG_NEW t65!2G"<  
#undef THIS_FILE \ gN) GR  
static char THIS_FILE[] = __FILE__; |w5#a_adM  
#endif TJ<PT  
#define IDM_SHELL WM_USER+1 E$T#o{pai  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); _rM%N+$&d_  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); *=8)]_=f  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; +2?[=g4;}  
class CAboutDlg : public CDialog ?/\;K1c p  
{ C"}x=cK  
 public: xl3U  
  CAboutDlg(); !l~hO  
  // Dialog Data ra3WLK  
  //{{AFX_DATA(CAboutDlg) O]>Or3oO  
  enum { IDD = IDD_ABOUTBOX }; km^AX:r1  
  //}}AFX_DATA z(ajR*\#  
  // ClassWizard generated virtual function overrides :/3`+&T^/  
  //{{AFX_VIRTUAL(CAboutDlg) MG6Tk(3S  
 protected: /H)g<YA  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support iw{n|&Y#`  
  //}}AFX_VIRTUAL cA*%K[9  
  // Implementation {MS&t09Wh  
 protected: P+/L, u  
  //{{AFX_MSG(CAboutDlg) gSC@uf  
  //}}AFX_MSG P/_XDP./U  
  DECLARE_MESSAGE_MAP() kU /?#s  
}; 1ysA~2  
UaBR;v-.B3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) kBT uM"  
{ b7n~z1$  
 //{{AFX_DATA_INIT(CAboutDlg) `XnFc*L 1  
 //}}AFX_DATA_INIT 5*CwQJC<  
} 0\m zGfd  
Q -+jG7vT  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) ,iyIF~1~#>  
{ ]:njP3r  
 CDialog::DoDataExchange(pDX); 0MOAd!N  
 //{{AFX_DATA_MAP(CAboutDlg) L \$zr,=C  
 //}}AFX_DATA_MAP B}Qo8i7 z  
} \8pbPo=x  
g/E;OcFaO  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) >eXNw}_j  
 //{{AFX_MSG_MAP(CAboutDlg) 23>?3-q  
 // No message handlers B[$e;h*Aw[  
 //}}AFX_MSG_MAP g (~&  
END_MESSAGE_MAP() ldxUq,p  
yF:fxdpw  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) aZ'p:9e  
: CDialog(CCaptureDlg::IDD, pParent) , R)[$n  
{ OJ 2M_q)e  
 //{{AFX_DATA_INIT(CCaptureDlg) e D}Ga4  
  m_bControl = FALSE; 4ldN0 _T5  
  m_bAlt = FALSE; 4 (yHD  
  m_bShift = FALSE; {hl_/ aG  
  m_Path = _T("c:\\"); qGw6Wp~  
  m_Number = _T("0 picture captured."); suVS!} C  
  nCount=0; ~UnfS};U  
  bRegistered=FALSE; RsbrD8*AD  
  bTray=FALSE; vw3W:TL  
 //}}AFX_DATA_INIT 2|cIu 'U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 >[p+L='  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ZGrV? @o,6  
} [`&cA#C9Yp  
>A)he!I  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ua{eri[  
{ %H@fVWe2wT  
 CDialog::DoDataExchange(pDX); }X$>84s>[P  
 //{{AFX_DATA_MAP(CCaptureDlg) 5ZSw0A(w  
  DDX_Control(pDX, IDC_KEY, m_Key); 5t PmrWZ  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); |`|b&Rhu  
  DDX_Check(pDX, IDC_ALT, m_bAlt); ; R67a V,  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 0QPipuP  
  DDX_Text(pDX, IDC_PATH, m_Path); o%dtf5}(,  
  DDX_Text(pDX, IDC_NUMBER, m_Number); >ko;CQR  
 //}}AFX_DATA_MAP ."lY>(HJ  
} eI[z%j[Y*  
NZ_45/(dx  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) 4M:oa#gh@  
//{{AFX_MSG_MAP(CCaptureDlg) K+7xjFoDIR  
 ON_WM_SYSCOMMAND() [;2v[&Po  
 ON_WM_PAINT() u66w('2  
 ON_WM_QUERYDRAGICON() xW09k6   
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 2|T@  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) mMMu'N  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 464Z0C  
//}}AFX_MSG_MAP b/ynCf8X  
END_MESSAGE_MAP() bi5'-.B  
u&<LW4  
BOOL CCaptureDlg::OnInitDialog() iZ58;`  
{ ZpZ~[BtQ  
 CDialog::OnInitDialog(); mdk:2ndP  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); K)k!`du!6  
 ASSERT(IDM_ABOUTBOX < 0xF000); YziQU_  
 CMenu* pSysMenu = GetSystemMenu(FALSE); cx$Oh`-Car  
 if (pSysMenu != NULL) vb%\q sf  
 { tpVtbh1)u  
  CString strAboutMenu; .-r 1.'.A  
  strAboutMenu.LoadString(IDS_ABOUTBOX); }vL[N~5\  
  if (!strAboutMenu.IsEmpty()) =?}'\ >G "  
  { _WkK%RYV  
   pSysMenu->AppendMenu(MF_SEPARATOR); 4Qw!YI#40$  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Jn&(v"_  
  } |k^X!C0  
 } ^!}lA9\gY  
 SetIcon(m_hIcon, TRUE); // Set big icon &K7g8x"x.  
 SetIcon(m_hIcon, FALSE); // Set small icon XnNK )dUT}  
 m_Key.SetCurSel(0); :ortyCB:H  
 RegisterHotkey(); (cMrEuv  
 CMenu* pMenu=GetSystemMenu(FALSE); ^c2 8Q.<w(  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]s<Q-/X  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); aH:eu<s  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Ji7A9Hk  
 return TRUE; // return TRUE unless you set the focus to a control ;[|x5o /<  
} gcz1*3)  
E 1>3[3  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) ~r{Nc j  
{ gh~C.>W}q+  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) lr|-_snx2  
 { 0 xXAhv-)O  
  CAboutDlg dlgAbout; j\ )Qn 2r  
  dlgAbout.DoModal(); -?GYW81Q  
 } Lrk^<:8;  
 else Xc@4(Nyp  
 { jHFdDw|N`  
  CDialog::OnSysCommand(nID, lParam); "z qt'b0bW  
 } R; IB o  
} B (BWdrG  
VA]%i P,O-  
void CCaptureDlg::OnPaint() xX&*&RPZ  
{ ch-GmAj 9  
 if (IsIconic()) Q8P;AN_JS  
 { !?KY;3L:  
  CPaintDC dc(this); // device context for painting x|Q6[Y  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 3Y=S^*ztd  
  // Center icon in client rectangle Obw uyhjQ  
  int cxIcon = GetSystemMetrics(SM_CXICON); =]D##R  
  int cyIcon = GetSystemMetrics(SM_CYICON); I*0 W\Qz@  
  CRect rect; %Jw;c`JM  
  GetClientRect(&rect); ;DRJL   
  int x = (rect.Width() - cxIcon + 1) / 2; iA:CPBv_mu  
  int y = (rect.Height() - cyIcon + 1) / 2; b)df V=  
  // Draw the icon c  xX  
  dc.DrawIcon(x, y, m_hIcon); DO0["O74  
 } |S.-5CAh4  
 else Y H?>2u  
 { pE=wP/#  
  CDialog::OnPaint(); 8*|@A6ig  
 } fc M~4yP?  
} 3GaM>w}>W  
7%0PsF _  
HCURSOR CCaptureDlg::OnQueryDragIcon() N!P* B $d  
{ #$A6s~`B  
 return (HCURSOR) m_hIcon; wi&m(f(~  
} }g`A*y;t  
JiRW|+`pe  
void CCaptureDlg::OnCancel() {Xl 5F.q  
{ lD{9o2  
 if(bTray) )`L!eN  
  DeleteIcon();  Z3I<  
  CDialog::OnCancel(); &3AGj,  
} /at#[Pw~01  
}+u<^7$g|  
void CCaptureDlg::OnAbout() j| 257D  
{ {6~W2zX&  
 CAboutDlg dlg; f}@]dFr  
 dlg.DoModal(); [jafPi(#g  
} c|I{U[(U  
xOS4J+'s@  
void CCaptureDlg::OnBrowse() LEk W^Mv  
{ ost~<4~  
 CString str; |vGz 1jLV  
 BROWSEINFO bi; D F0~A  
 char name[MAX_PATH]; VNPuOU=  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); d/|@"z^?  
 bi.hwndOwner=GetSafeHwnd(); ] Li(E:  
 bi.pszDisplayName=name; N<?RN;M  
 bi.lpszTitle="Select folder"; 5 1 L:%Af  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; br0gB3 r  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); O-G4^V8  
 if(idl==NULL) g6nBu  
  return; mvYr"6f8  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Iy"   
 str.ReleaseBuffer(); y\ouIsI77  
 m_Path=str; Rh: \/31~  
 if(str.GetAt(str.GetLength()-1)!='\\') h v9s  
  m_Path+="\\"; E4WoKuE1$  
 UpdateData(FALSE); @!K)(B;A0b  
} A/ GEDG ?  
{N>VK*  
void CCaptureDlg::SaveBmp() {X8F4  
{ 4F/Q0"  
 CDC dc; pnVtjWrbG  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); ]2tX'=X  
 CBitmap bm; ,u! c|4  
 int Width=GetSystemMetrics(SM_CXSCREEN); J#bEAK^L,l  
 int Height=GetSystemMetrics(SM_CYSCREEN); i9+V<'h  
 bm.CreateCompatibleBitmap(&dc,Width,Height); YMJ?t"  
 CDC tdc; I2D<~xP~2+  
 tdc.CreateCompatibleDC(&dc); '|Cs!Zl  
 CBitmap*pOld=tdc.SelectObject(&bm); 0gxbo  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ?e yo2:-$  
 tdc.SelectObject(pOld); ij%\ld9kd  
 BITMAP btm; MB:E/  
 bm.GetBitmap(&btm); M]eH JZ~v  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *p+%&z_<  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); skr^m%W  
 BITMAPINFOHEADER bih; ba|~B8rII[  
 bih.biBitCount=btm.bmBitsPixel; _G[5S-0 [  
 bih.biClrImportant=0; ck-wMd  
 bih.biClrUsed=0; O'o`  
 bih.biCompression=0; QIG MP=!j  
 bih.biHeight=btm.bmHeight; z]~B@9l  
 bih.biPlanes=1; YpXUYNy  
 bih.biSize=sizeof(BITMAPINFOHEADER); w0VJt<e*  
 bih.biSizeImage=size; .}2^YOmd  
 bih.biWidth=btm.bmWidth; P|c79  
 bih.biXPelsPerMeter=0; _ 4pBJOJQ6  
 bih.biYPelsPerMeter=0; CShVJ:u+K\  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); R )ejIKtY  
 static int filecount=0; par $0z/  
 CString name; 91`biVZfA  
 name.Format("pict%04d.bmp",filecount++); G+=&\+{#4  
 name=m_Path+name; 8la.N*  
 BITMAPFILEHEADER bfh; #;>J<>  
 bfh.bfReserved1=bfh.bfReserved2=0; $d4eGL2S  
 bfh.bfType=((WORD)('M'<< 8)|'B'); NhXTt!S6C  
 bfh.bfSize=54+size; `dMl5b  
 bfh.bfOffBits=54; r(0I>|u  
 CFile bf; lzw3 x  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ hP,SvN#!2  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 'd(OFE-hn  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 74xI#`E  
  bf.WriteHuge(lpData,size); "pQM$3n(  
  bf.Close(); (Sv7^}j  
  nCount++; p~DlZk"  
 } a|  
 GlobalFreePtr(lpData); bvk+i?{H  
 if(nCount==1) m},nKsO  
  m_Number.Format("%d picture captured.",nCount); dGr Ow)  
 else qdjRw#LS^q  
  m_Number.Format("%d pictures captured.",nCount); k-Le)8+b  
  UpdateData(FALSE); ) yRC$7I  
} t-3wjS1v  
?9 m3y0  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Y+F$]!hw  
{ GL9R 5  
 if(pMsg -> message == WM_KEYDOWN) (+q?xwl!N  
 { Y6W3WPs(  
  if(pMsg -> wParam == VK_ESCAPE) *.~hn5Y|?  
   return TRUE; )j]S ;Mr  
  if(pMsg -> wParam == VK_RETURN) Lb{~a_c  
   return TRUE; m{I_E G  
 } 6^s]2mMfk  
 return CDialog::PreTranslateMessage(pMsg);  J<V}g v  
} 76 #  
yAi#Y3!::  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) p$0;~1vH  
{ XGk8Ki3w  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ?so 3Kj6H  
  SaveBmp(); '[{M"S  
  return FALSE; 4ehajK  
} &:nWZ!D  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ mAX]m1s  
 CMenu pop; -P!vCf^{ t  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); j}X4#{jgC  
 CMenu*pMenu=pop.GetSubMenu(0); ^-f5;B`\i  
 pMenu->SetDefaultItem(ID_EXITICON); x\3tSP7Vp  
 CPoint pt; |Gzd|$%Oq  
 GetCursorPos(&pt); _|g(BK2}  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Xa Yx avq  
 if(id==ID_EXITICON) >OBuHqC  
  DeleteIcon(); U3&*,xeU@H  
 else if(id==ID_EXIT) 4;7<)&#h  
  OnCancel(); >8#(GXnSt  
 return FALSE; o.Mb~8Yu  
} #Jq@p_T"  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); -$.$6"]  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ^{zwIH2I]  
 AddIcon(); iS hB ^  
 return res; =uYSZR  
} 6jO*rseC  
 #Z"N\49  
void CCaptureDlg::AddIcon() Cc1sZWvz  
{ I`5F& 8J{  
 NOTIFYICONDATA data; C;OU2,c,T  
 data.cbSize=sizeof(NOTIFYICONDATA); YL;ZZ2A  
 CString tip; Km 'd=B>Jy  
 tip.LoadString(IDS_ICONTIP); nsaf6y&E  
 data.hIcon=GetIcon(0); qWy{{ A+  
 data.hWnd=GetSafeHwnd(); CDO _A\  
 strcpy(data.szTip,tip); %Jq(,u  
 data.uCallbackMessage=IDM_SHELL; q}M^i7IE  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; C' o4Su#  
 data.uID=98; 3Nsb@0  
 Shell_NotifyIcon(NIM_ADD,&data); Ni(D[?mZ  
 ShowWindow(SW_HIDE); @j9yc  
 bTray=TRUE; Z@RAdwjR`p  
} 'lHtz ~[  
svU107?  
void CCaptureDlg::DeleteIcon() Fu^^Jex  
{ aEy_H-6f  
 NOTIFYICONDATA data; %&V<kH"7Q{  
 data.cbSize=sizeof(NOTIFYICONDATA); C.C\(2- Rr  
 data.hWnd=GetSafeHwnd(); o{ f n}  
 data.uID=98; R0gjx"U  
 Shell_NotifyIcon(NIM_DELETE,&data); R =mawmQ2  
 ShowWindow(SW_SHOW); ^r(2 r  
 SetForegroundWindow(); LZX-am`%  
 ShowWindow(SW_SHOWNORMAL); V}'|a<8kVv  
 bTray=FALSE; ]W5s!T_  
} Y GO ;wIS  
YzhZ%:8  
void CCaptureDlg::OnChange() ZBJ.dK?Ky|  
{ j0kEi+!TVq  
 RegisterHotkey(); B>o #eW  
}  8Nd +  
}zlvs a+  
BOOL CCaptureDlg::RegisterHotkey() 3 ^{U:"N0  
{ 4<ER dP7"-  
 UpdateData(); RD=!No?  
 UCHAR mask=0; 8:huWjh]M  
 UCHAR key=0; :c!7rh7O  
 if(m_bControl) kD >|e<}\  
  mask|=4; SdnqM`uFo  
 if(m_bAlt) ?Xlmt$Jp  
  mask|=2; {1#5\t>9yD  
 if(m_bShift) l!~8  
  mask|=1; nm*1JA.:  
  key=Key_Table[m_Key.GetCurSel()]; 7V 2%  
 if(bRegistered){ 6i9m!YQV  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); mu=u!by.E  
  bRegistered=FALSE; o-("S|A-  
 } Lyt6DvAp"  
 cMask=mask; XFG]%y=/6  
 cKey=key; \%mR*J+  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); RgRyo  
 return bRegistered; :1hp_XfJb  
} ]^8:"Ky'  
u17Da9@;  
  四、小结 /(W{`  
D<5gdIw  
  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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