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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< CPaun  
  Q}=RG//0*  
  一、实现方法 3Aj_,&X.@(  
?1N0+OW   
  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: y:42H tS  
'^/E2+  
#pragma data_seg("shareddata") Bw_Ih|y,w  
HHOOK hHook =NULL; //钩子句柄 &)X<yd0  
UINT nHookCount =0; //挂接的程序数目 <rC#1wR4  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 wP8R=T  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1  ]Ea7b  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey JxLH]1b  
static int KeyCount =0; XS!ZTb>[  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 6pLwwZD  
#pragma data_seg() LqUvEq  
3FXMM&w  
  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。 gx6&'${=#  
`+f\Q2]Z  
  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: _yoG<qI  
aDOH3Ri0K!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR 1|nB\xgu  
cKey,UCHAR cMask) E{fnh50^Q.  
{ )I>rC%2P  
 BOOL bAdded=FALSE; )/U1; O  
 for(int index=0;index<MAX_KEY;index++){ #!5Nbe  
  if(hCallWnd[index]==0){ e`~q ;?:  
   hCallWnd[index]=hWnd; WuNu}Ibl}m  
   HotKey[index]=cKey; Dw #&x/G  
   HotKeyMask[index]=cMask; yBe/UFp+  
   bAdded=TRUE; _bd#C   
   KeyCount++; PR'FSTg  
   break; ]bR'J\Fwl  
  } d#d~t[=  
 } E{6}'FG+A  
 return bAdded; u]2k%TUY  
} v'>Yc#VJ  
//删除热键 E, v1F!  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) l3afuD :  
{ m[bu(qz  
 BOOL bRemoved=FALSE; V")Q4h{  
 for(int index=0;index<MAX_KEY;index++){ c:6w >:  
  if(hCallWnd[index]==hWnd){ qnS7z%H8  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ IY19G U9  
    hCallWnd[index]=NULL; Kulg84<AwM  
    HotKey[index]=0; B.G!7>=  
    HotKeyMask[index]=0; *Qf }4a0  
    bRemoved=TRUE; 7wqwDE  
    KeyCount--; #NE^f2  
    break; *Vc=]Z2G^  
   } Kje+Niz7  
  } `o3d@Vc  
 } \k,bz 0  
 return bRemoved; M/DTD98'N  
} :3t])mL#   
>ahj|pm  
j41:]6  
  DLL中的钩子函数如下: z K(5&u  
"EHc&,B`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) kb:C>Y8!sC  
{ </=PN1=A  
 BOOL bProcessed=FALSE; c[y8"M5  
 if(HC_ACTION==nCode) 1v4kN -  
 { bGJUu#  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 5QSmim  
   switch(wParam) 1P[Lz!C  
   {  3a qmK.`H  
    case VK_MENU: L C7LO  
     MaskBits&=~ALTBIT; &wuV}S 7  
     break;  %aKkk)s  
    case VK_CONTROL: "qsNySI  
     MaskBits&=~CTRLBIT; mr1}e VM~!  
     break; y|dXxd9  
    case VK_SHIFT: mqHt%RX  
     MaskBits&=~SHIFTBIT; xS}H483h6W  
     break; nKO&ffb'<  
    default: //judge the key and send message } 8P}L@q  
     break; ^%d{i'9?  
   } U %ESuq#  
   for(int index=0;index<MAX_KEY;index++){ cP1jw%3P  
    if(hCallWnd[index]==NULL) k:TfE6JZ  
     continue; SRTpE,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #{M -3  
    { 5a ~tp'  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); *o[%?$8T  
     bProcessed=TRUE; duS #&w  
    } r+\z0_' w6  
   } %p9bl ,x  
  } c6HU'%v  
  else if((lParam&0xc000ffff)==1){ //有键按下 ,_$"6  
   switch(wParam) tTt3D]h(  
   { ]#$kA9  
    case VK_MENU: bIArAS9%  
     MaskBits|=ALTBIT; 8w&rj-  
     break; lnDDFsA  
    case VK_CONTROL: =5ih,>>g  
     MaskBits|=CTRLBIT; 4I-p/&Q  
     break; //Gvk|O1  
    case VK_SHIFT: Oi0;.< kX  
     MaskBits|=SHIFTBIT; JY2 F-0t)  
     break; j''Iai_  
    default: //judge the key and send message ? iX=2-  
     break; "Y!dn|3  
   } 4l''/$P  
   for(int index=0;index<MAX_KEY;index++){  YBD{l  
    if(hCallWnd[index]==NULL) AD\<}/3U  
     continue; L:M9|/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V,+[XB  
    { tFaE cP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); @?m8/t9 .  
     bProcessed=TRUE; mr!I}I7x&x  
    } DQ\&5ytP  
   } H g`{9v  
  } mM} Ukmy  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 !XG&=Rd?  
   for(int index=0;index<MAX_KEY;index++){ pxxFm~"d  
    if(hCallWnd[index]==NULL) qDM[7q3.  
     continue; +q/h:q.TV  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Qu,k  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); jw[BtRW  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 *Zi%Q[0Me  
   } p'uz2/g  
  } $ rYS   
 } &=Zg0Q  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); />Vx*^u8Hz  
} } 4]<P  
ZZU8B?)  
  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:  <%D"eD  
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BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b 0b9#9x  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); s[q4K  
U"+ ry.3`  
  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: ig}e@]  
A+*oT(`  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) E`fssd~  
{ r0deBRM  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) aT!9W'uY  
 { 50ew/fZj|  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 aNC,ccm  
  SaveBmp(); :bRR(sP  
  return FALSE; Kk>qgi$  
 } 5\0.[W{^  
 …… //其它处理及默认处理 _IV@^v  
} 6KCmswvE  
`Kw"XGT  
4E-A@FR  
  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。 *ZR@ z80i  
AaYrVf 9!  
  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。 YC&jKx.>  
g0j4<\F2\  
  二、编程步骤 loUwR z  
_P<lG[V  
  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"; KWJgW{{v  
:6$4K"^1  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; bmVgTm&  
W)!{U(X  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 5@D7/$bLp  
$xtE+EV.p  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 1m`tqlFU9  
7~ese+\smG  
  5、 添加代码,编译运行程序。 DRW.NL o  
sV^h#g~Zb  
三、程序代码 S@xsAib0J  
pLQSG}N  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL )L<?g !j~  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) Z4AAg  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ 1O2h9I$bk  
#if _MSC_VER > 1000 %DRy&k/T  
#pragma once 2^ bpH%  
#endif // _MSC_VER > 1000 ; G59}d p~  
#ifndef __AFXWIN_H__ ^ wF@6e7/&  
#error include 'stdafx.h' before including this file for PCH Q^Z<RA(C  
#endif ?>.g;3E$  
#include "resource.h" // main symbols 9LEilmPs  
class CHookApp : public CWinApp id tQXwa  
{ te*Y]-&I|/  
 public: )~.&bEm\  
  CHookApp(); W,/C?qFp  
  // Overrides o`K^Wy~+k#  
  // ClassWizard generated virtual function overrides 6eUiI@J  
  //{{AFX_VIRTUAL(CHookApp) kE_@5t7O{  
 public: HS`bto0*  
  virtual BOOL InitInstance(); Gr#rM/AfCK  
  virtual int ExitInstance(); ZC5Yve8  
  //}}AFX_VIRTUAL ^s@*ISY  
  //{{AFX_MSG(CHookApp) :uwRuPI  
  // NOTE - the ClassWizard will add and remove member functions here. mrhp)yF  
  // DO NOT EDIT what you see in these blocks of generated code ! @ oz&  
  //}}AFX_MSG *[xNp[4EU  
  DECLARE_MESSAGE_MAP() ;WS7.  
}; QR5,_wJ&  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); (: TGev  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); sMfFm@\N  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K"k"ml<4E  
BOOL InitHotkey(); ]PzTl {]  
BOOL UnInit(); r$r&4d Y  
#endif k~jKJb-_  
L_gsG|xX  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. aC,vh1")F  
#include "stdafx.h" 0"kE^=  
#include "hook.h" QK?2E   
#include <windowsx.h> LD~Jbq  
#ifdef _DEBUG `F2*o47|t  
#define new DEBUG_NEW 3_oD[ ])A  
#undef THIS_FILE {"0TO|%x  
static char THIS_FILE[] = __FILE__; siRnH(^ J  
#endif Jl> at  
#define MAX_KEY 100 D){"fw+b  
#define CTRLBIT 0x04 2[LX\  
#define ALTBIT 0x02 gl9pgY1ni  
#define SHIFTBIT 0x01 @r/Id{pCI  
#pragma data_seg("shareddata") M8?#%x6;N  
HHOOK hHook =NULL; urrO1  
UINT nHookCount =0; u_4:#~b  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?b@q5Y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT _PyW=Tj  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey 5"}y\  
static int KeyCount =0; %%as>}.  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift ?K4.L?D#J  
#pragma data_seg() I[g?Ju >  
HINSTANCE hins; :^H9W^2  
void VerifyWindow(); Zc4(tf9  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) 8L7Y A)u  
//{{AFX_MSG_MAP(CHookApp) z<o E!1St  
// NOTE - the ClassWizard will add and remove mapping macros here. TRk ?8  
// DO NOT EDIT what you see in these blocks of generated code! co<2e#p;  
//}}AFX_MSG_MAP 4aalhy<j  
END_MESSAGE_MAP() 1=/doo{^  
# Z|%0r_~  
CHookApp::CHookApp() !Bk[p/\  
{ E?Qz/*'zv  
 // TODO: add construction code here, ) ]/i  
 // Place all significant initialization in InitInstance S om. qD  
} I3G*+6V  
~jp!"f  
CHookApp theApp; +H[}T ]  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s`Yu"s 8}4  
{ 0+K`pS'  
 BOOL bProcessed=FALSE; v7o?GQ75  
 if(HC_ACTION==nCode) I 9{40_  
 { A;fB6  
  if((lParam&0xc0000000)==0xc0000000){// Key up -YzQ2#K  
   switch(wParam) #gX%X~w$F  
   { 3R<ME c  
    case VK_MENU: IW1GhZ41'  
     MaskBits&=~ALTBIT; 1A%N0#_(Md  
     break; tDC0-N&6S~  
    case VK_CONTROL: MPKpS3VS  
     MaskBits&=~CTRLBIT; ~j/bCMEf!  
     break; 1N!Oslum  
    case VK_SHIFT: 4;BW  
     MaskBits&=~SHIFTBIT; @4 /~~  
     break; xta}4:d-Y  
    default: //judge the key and send message X+dR<GN+YX  
     break; ;g: UE  
   } l~]hGLviJE  
   for(int index=0;index<MAX_KEY;index++){ [Krm .)  
    if(hCallWnd[index]==NULL) t4f (Y,v  
     continue; zB#_:(1qK  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) U{T[*s  
    { LN@E\wRw{r  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); --in+  
     bProcessed=TRUE; C2+{U  
    } ?(5o@Xq  
   } U6c)"^\  
  } j>$=SMc  
  else if((lParam&0xc000ffff)==1){ //Key down pau*kMu^}  
   switch(wParam) tJUVw=  
   { {E3xI2  
    case VK_MENU: Ne &Xf  
     MaskBits|=ALTBIT; o,?!"*EP  
     break; =7 Jy  
    case VK_CONTROL: DAjG *K{  
     MaskBits|=CTRLBIT; +"k.E x0:  
     break; v2/yw,  
    case VK_SHIFT: gHQPhe#n  
     MaskBits|=SHIFTBIT; TqS2!/jp  
     break; &u+yM D  
    default: //judge the key and send message u:_sTfKm&  
     break; [NHg&R H  
   } RDUT3H6~  
   for(int index=0;index<MAX_KEY;index++) e1^fUOS  
   { E:08%4O  
    if(hCallWnd[index]==NULL) ad"'O]  
     continue; vC)"*wYB{  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X}zX`]:I'  
    { Pv< QjY  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); M0cd-Dn  
     bProcessed=TRUE; TA Ftcs:  
    } ~gu=x&{  
   } I*^5'N'  
  } 44\!PYf7  
  if(!bProcessed){ KKLR'w,A>  
   for(int index=0;index<MAX_KEY;index++){ ]YCPyc:  
    if(hCallWnd[index]==NULL) W*YxBn4  
     continue; lemVP'cn  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) p Tcbq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); *-?Wcz  
   } 3.Ji5~  
  } Yuwc$Qp)  
 } 7#~4{rjg  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); |w=Ec#)t4  
} S-isL4D.Z  
)D:9R)m  
BOOL InitHotkey() 6D/uo$1Y  
{ 1)$%Jr  
 if(hHook!=NULL){ Kb^>X{  
  nHookCount++; 7sXy`+TZ->  
  return TRUE; j'3j}G%\T  
 } ec`bz "1  
 else ,%A)"doaG  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); bRWIDPh  
  if(hHook!=NULL) 8V6=i'GK  
   nHookCount++; r)gCTV(kb  
  return (hHook!=NULL);  ci`zR9Ks  
} ~ct2`M$TL(  
BOOL UnInit() py]KTRzy  
{ lwVk(l Z  
 if(nHookCount>1){ i*X{^A73"  
  nHookCount--; Y^ QKp"  
  return TRUE; As0 B\  
 } F7\BF  
 BOOL unhooked = UnhookWindowsHookEx(hHook); ):3MYSqX  
 if(unhooked==TRUE){ *~c qr  
  nHookCount=0; 3I|O^   
  hHook=NULL; \,2gTi,=  
 } w"{bp  
 return unhooked; & B}Lo  
} <O.Kqk* nq  
gdl| ^*tc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) >L8?=>>?\  
{ 0|ZVA+  
 BOOL bAdded=FALSE; {{32jU7<  
 for(int index=0;index<MAX_KEY;index++){ uM<|@`&b  
  if(hCallWnd[index]==0){ O#vn)+Y,*  
   hCallWnd[index]=hWnd; q%>7L<r  
   HotKey[index]=cKey; @|BD|{k  
   HotKeyMask[index]=cMask; y`4{!CEyLW  
   bAdded=TRUE; ;>DHD*3X  
   KeyCount++;  }<=3W5+  
   break; W]_g4,T>  
  } rOW;yJ[  
 } Kv}k*A% S  
 return bAdded; %MN.O-Lc  
} W@^J6sH  
O16r!6=-n  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) flP>@i:e6  
{ zDB" r  
 BOOL bRemoved=FALSE; dXl]Pe|v  
 for(int index=0;index<MAX_KEY;index++){ |k6Ox*  
  if(hCallWnd[index]==hWnd){ RAV^D.  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ L x.jrF|&  
    hCallWnd[index]=NULL; cJ. 7Mt  
    HotKey[index]=0; lkb2?2\+  
    HotKeyMask[index]=0; _%{0?|=  
    bRemoved=TRUE; C,"=}z1P  
    KeyCount--; bG(x:Py&  
    break; |H W( vA  
   } 4@6 <  
  } W .U+.hR  
 } T^]7R4 Fg  
 return bRemoved; /YFa ;2 W  
} Q/py qe G  
qEQAn/&  
void VerifyWindow() b,Ke>.m  
{ Nt~x&s  
 for(int i=0;i<MAX_KEY;i++){  MGQ,\55"  
  if(hCallWnd!=NULL){ /g@^H/DO  
   if(!IsWindow(hCallWnd)){ K\(6 rS}N  
    hCallWnd=NULL; 7(Cx!Yb  
    HotKey=0; lm$;:Roj*  
    HotKeyMask=0; P`EgA  
    KeyCount--; #-{N Ws\  
   } [(ygisqt  
  } H -,TS^W  
 } Iyyo3awc  
} 0/Z !5-.  
hsz^rZ  
BOOL CHookApp::InitInstance() $3k "WlRG  
{ n(>C'<otj  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); &RW`W)0;  
 hins=AfxGetInstanceHandle(); j0x5@1`6G  
 InitHotkey(); ZVL gK}s  
 return CWinApp::InitInstance(); `*aBRwvK~  
} Lc]1$  
2JZdw  
int CHookApp::ExitInstance() fQU{SjG  
{ tuxRVV8l  
 VerifyWindow(); NEV p8)w  
 UnInit(); s?c JV `  
 return CWinApp::ExitInstance(); 5/?P|T   
} @ 7W?8  
 qSTWb%  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xQU"A2{}>  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3z3_7XI  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ .'j29 6[u  
#if _MSC_VER > 1000  $:EG%jl  
#pragma once Uw)=WImz[  
#endif // _MSC_VER > 1000 CxDcY  
a9l8{ 3  
class CCaptureDlg : public CDialog 8z}^jTM  
{ AbfZ++aJ  
 // Construction NYB "jKMk  
 public: 0Z HDBh  
  BOOL bTray; &94W-zh  
  BOOL bRegistered; ?3q@f\fZ  
  BOOL RegisterHotkey(); M'2r@NR8  
  UCHAR cKey; g)R1ObpZ  
  UCHAR cMask; o=_c2m   
  void DeleteIcon(); RlRs}yF  
  void AddIcon(); 3vW4<:Lgy  
  UINT nCount; :q (&$  
  void SaveBmp(); ',)7GY/n~  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor fF;h V  
  // Dialog Data f%XJ;y\,9H  
  //{{AFX_DATA(CCaptureDlg) W~ruN4q.  
  enum { IDD = IDD_CAPTURE_DIALOG }; 4h8*mMghs  
  CComboBox m_Key; bL`eiol6  
  BOOL m_bControl; ? ?[g}>  
  BOOL m_bAlt; 1nI^-aQ3  
  BOOL m_bShift; 3^wC<ZXcD  
  CString m_Path; BzN@gQo  
  CString m_Number; |^( M{  
  //}}AFX_DATA ,T|x)"uA`  
  // ClassWizard generated virtual function overrides U~H?4Izl=  
  //{{AFX_VIRTUAL(CCaptureDlg) cWa)#:JOV  
 public: U>F{?PReA?  
  virtual BOOL PreTranslateMessage(MSG* pMsg); cyQBqG  
 protected: =a$Oecg?  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }k7'"`#?"  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ->gZ)?Fqy  
  //}}AFX_VIRTUAL KX4],B5 +  
  // Implementation q \O Ou  
 protected: !SxG(*u  
  HICON m_hIcon; & mt)d  
  // Generated message map functions vt1lR5  
  //{{AFX_MSG(CCaptureDlg) !{Z~<Ky  
  virtual BOOL OnInitDialog(); LFf`K)q  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); QyGnDomQ  
  afx_msg void OnPaint(); ;Vu5p#,O<M  
  afx_msg HCURSOR OnQueryDragIcon(); FTf<c0  
  virtual void OnCancel(); 2SG$LIV 9Y  
  afx_msg void OnAbout(); J7+w4q~cB`  
  afx_msg void OnBrowse(); BKIjNV3  
  afx_msg void OnChange(); Riry_   
 //}}AFX_MSG O!&,5Dy  
 DECLARE_MESSAGE_MAP() F9flSeN  
}; wtH~-xSB|  
#endif XP3x Jm3  
p|[B =.c{  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file W Zn.;  
#include "stdafx.h" <1"+,}'x  
#include "Capture.h" ig+4S[L~n  
#include "CaptureDlg.h" [[+ pMI  
#include <windowsx.h> +TJ EG?o  
#pragma comment(lib,"hook.lib") GP a`e  
#ifdef _DEBUG PaWr[ye  
#define new DEBUG_NEW $`J_:H%  
#undef THIS_FILE #07!-)Gv  
static char THIS_FILE[] = __FILE__; xDLG=A%]z  
#endif /+|#^:@  
#define IDM_SHELL WM_USER+1 =L]Q2V}  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); !{%&=tIZ  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); !3 qVB  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; =#xK=pRy;  
class CAboutDlg : public CDialog e0HfP v_  
{ F0lOlS   
 public: F]+~x/!  
  CAboutDlg(); j/!H$0PN  
  // Dialog Data q(IQa@$SR  
  //{{AFX_DATA(CAboutDlg) H/fUM  
  enum { IDD = IDD_ABOUTBOX }; ]$b2a&r9  
  //}}AFX_DATA *rh,"Zo  
  // ClassWizard generated virtual function overrides s:>\/[*>0c  
  //{{AFX_VIRTUAL(CAboutDlg) L.'}e{ldW  
 protected: h2Bz F  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support fV\]L4%  
  //}}AFX_VIRTUAL >I"V],d!6  
  // Implementation q_[G1&MC  
 protected: 5&!c7$K0  
  //{{AFX_MSG(CAboutDlg) {XCf-{a]~  
  //}}AFX_MSG 9KuD(EJS  
  DECLARE_MESSAGE_MAP() quxdG>8  
}; * ?Jz2[B  
r@G#[.*A>  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) WyhhCR=;  
{ PBjmGwg7  
 //{{AFX_DATA_INIT(CAboutDlg) s^8u&y)3  
 //}}AFX_DATA_INIT s Be7"^  
} !|Q5Zi;aX7  
>QkP7Kb  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 8V/L:h#7  
{ ~+6Vdx m  
 CDialog::DoDataExchange(pDX); *%5{'  
 //{{AFX_DATA_MAP(CAboutDlg) 2f~($}+*  
 //}}AFX_DATA_MAP %;xOB^H^  
} ~@W*r5/  
Kg\R+i@#<  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) K }$&:nao  
 //{{AFX_MSG_MAP(CAboutDlg) 3L5r*fa  
 // No message handlers U9hS<}<Ki  
 //}}AFX_MSG_MAP ]/X(V|t  
END_MESSAGE_MAP() p *w$:L  
eD?3"!c!  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) j]rz] k  
: CDialog(CCaptureDlg::IDD, pParent) uBrMk  
{ DGESba\2+  
 //{{AFX_DATA_INIT(CCaptureDlg)  ;q>9W,jy  
  m_bControl = FALSE; zCaT tb|@  
  m_bAlt = FALSE; GEUg]nw  
  m_bShift = FALSE; %/%UX{8R  
  m_Path = _T("c:\\"); 0E`1HP"b  
  m_Number = _T("0 picture captured."); 5VW|fI  
  nCount=0; q8P.,%   
  bRegistered=FALSE; 7V7zGx+Z7  
  bTray=FALSE; ?/hZb"6W  
 //}}AFX_DATA_INIT yR5XJ;Tct  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 SkQswH  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); oXsL9,  
} E0n6$5Uc?  
b \7iY&.C|  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) $FTO  
{ m"eteA,"k_  
 CDialog::DoDataExchange(pDX); )RgGcHT@  
 //{{AFX_DATA_MAP(CCaptureDlg) tz NlJ~E  
  DDX_Control(pDX, IDC_KEY, m_Key); >o,^b\  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); -e GL)M  
  DDX_Check(pDX, IDC_ALT, m_bAlt); W!Gdf^Yy<  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); (.Y/  
  DDX_Text(pDX, IDC_PATH, m_Path); k44Q):ncY7  
  DDX_Text(pDX, IDC_NUMBER, m_Number); 5*%#o  
 //}}AFX_DATA_MAP "UFs~S|e  
} 0pb '\lA  
m7c*)"^  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) QF2q^[>w6  
//{{AFX_MSG_MAP(CCaptureDlg) CT a#Q,  
 ON_WM_SYSCOMMAND() .wA+S8}S  
 ON_WM_PAINT() t&q N: J  
 ON_WM_QUERYDRAGICON() jEdtJ EPa  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) 0 fXLcal  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ,8'>R@o  
 ON_BN_CLICKED(ID_CHANGE, OnChange) @D^^_1~  
//}}AFX_MSG_MAP u^Ku;RQo  
END_MESSAGE_MAP() Uh eC  
oTjyN\?H  
BOOL CCaptureDlg::OnInitDialog() 2NGe C0=  
{ p/Sbt/R  
 CDialog::OnInitDialog(); m0w;8uF2UV  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ~+X9g  
 ASSERT(IDM_ABOUTBOX < 0xF000); URgk^nt2p  
 CMenu* pSysMenu = GetSystemMenu(FALSE); e!-,PU9+  
 if (pSysMenu != NULL) 6Q&r0>^{  
 { "^j>tii  
  CString strAboutMenu; O)|P,?  
  strAboutMenu.LoadString(IDS_ABOUTBOX); _9H*agRe  
  if (!strAboutMenu.IsEmpty()) BAj-akc f  
  { (:V>Hjt  
   pSysMenu->AppendMenu(MF_SEPARATOR);  +ECDD'^!  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); _Q%vK*n  
  } ^g1f X1  
 } S{]7C?4`  
 SetIcon(m_hIcon, TRUE); // Set big icon 0-Y:v(|.  
 SetIcon(m_hIcon, FALSE); // Set small icon +yob)%  
 m_Key.SetCurSel(0); %sBAl.!BN  
 RegisterHotkey(); &.13dq  
 CMenu* pMenu=GetSystemMenu(FALSE); MB ju![n  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); j1q[2'  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); s.Y4pWd5@  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); cLa]D[H  
 return TRUE; // return TRUE unless you set the focus to a control pL=d% m.W  
} mMx ;yZ  
!rDdd%Z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) D%mXA70  
{ JG[o"&Sd  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) thi1kJ`L  
 { _mvxsG  
  CAboutDlg dlgAbout; v44}%$  
  dlgAbout.DoModal(); r[(xj n  
 } Lf([dE1  
 else G0 J4O!3  
 { c !ZM  
  CDialog::OnSysCommand(nID, lParam); yq-=],h  
 } 5RH2"*8T  
} k#Of]mXXz  
s`j~-P  
void CCaptureDlg::OnPaint() ,21 np  
{ <:/&&@2  
 if (IsIconic()) &;,,H< p  
 { 1(Y7mM8\  
  CPaintDC dc(this); // device context for painting m"\:o  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .o1^Oh  
  // Center icon in client rectangle B&+`)E{KB  
  int cxIcon = GetSystemMetrics(SM_CXICON); Yb i%od&  
  int cyIcon = GetSystemMetrics(SM_CYICON); OJN2z  
  CRect rect; 5 8-e^.  
  GetClientRect(&rect); unJid8Lo  
  int x = (rect.Width() - cxIcon + 1) / 2; 87%*+n:?*  
  int y = (rect.Height() - cyIcon + 1) / 2; YIt& >  
  // Draw the icon Md6]R-l@  
  dc.DrawIcon(x, y, m_hIcon); {Sl57!U5  
 } OdWou|Gz  
 else xqXDxJlns  
 { t>GfM  
  CDialog::OnPaint(); (bOpV>\Q7  
 } Tu{&v'!j6  
} :WI.LKlo~  
pMg3fUIM  
HCURSOR CCaptureDlg::OnQueryDragIcon() zsU=sTsL  
{ ?&LZB}1R  
 return (HCURSOR) m_hIcon; s](aNe2j  
} _zt1 9%Wg  
- K%,^6  
void CCaptureDlg::OnCancel() k%wn0Erd  
{ Xtz-\v#0o'  
 if(bTray) KTvzOI8  
  DeleteIcon(); &mj6rIz  
  CDialog::OnCancel(); hUQ,z7-  
} CycUeT  
fPi3s b`}  
void CCaptureDlg::OnAbout() \T]EZ'+O  
{ Qu5UVjbE,  
 CAboutDlg dlg; L%v^s4@  
 dlg.DoModal(); QIN."&qC^  
} I)q,kP@yY  
_LAS~x7,  
void CCaptureDlg::OnBrowse() HkV1sT  
{ A7! g  
 CString str; 72sD0)?A  
 BROWSEINFO bi; 6C>_a*w  
 char name[MAX_PATH]; }pk#!N  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); yc2/~a_ Gx  
 bi.hwndOwner=GetSafeHwnd(); RsU3Gi_Zdz  
 bi.pszDisplayName=name; < v]3g  
 bi.lpszTitle="Select folder"; <R%;~){  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 6Ao%>;e*  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); LA_3=@2.H  
 if(idl==NULL) n .!Ym X4  
  return; >@WX>0`ht  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); X1IeSMAe  
 str.ReleaseBuffer(); Eh-n  
 m_Path=str; +,o0-L1D  
 if(str.GetAt(str.GetLength()-1)!='\\') <9=9b_z  
  m_Path+="\\"; YY?a>j."a  
 UpdateData(FALSE); /&u<TJ4  
} N=:5eAza  
0JgL2ayIVI  
void CCaptureDlg::SaveBmp() ^mAYBOE  
{ ]0;864X0  
 CDC dc; EF pIp4_Y  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); #-3=o6DCK  
 CBitmap bm; "'g[1Li  
 int Width=GetSystemMetrics(SM_CXSCREEN); J};z85B  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2<&Bw2  
 bm.CreateCompatibleBitmap(&dc,Width,Height); -p-B2?)A  
 CDC tdc; `X,yM-(  
 tdc.CreateCompatibleDC(&dc); rC:?l(8ng3  
 CBitmap*pOld=tdc.SelectObject(&bm); L,d LE-L  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); TI9UXa:V\  
 tdc.SelectObject(pOld); w ;daC(:  
 BITMAP btm; Ggh.dZI4  
 bm.GetBitmap(&btm); *A}cL  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; g }laG8  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); r]W  
 BITMAPINFOHEADER bih; 7nbB^2  
 bih.biBitCount=btm.bmBitsPixel; _#$ *y  
 bih.biClrImportant=0; ?JV|dM  
 bih.biClrUsed=0; 6"c1;P!4   
 bih.biCompression=0; V{|}}b?w?  
 bih.biHeight=btm.bmHeight; 2tROT][J%  
 bih.biPlanes=1; ZKg{0DY  
 bih.biSize=sizeof(BITMAPINFOHEADER); Ca%g_B0t  
 bih.biSizeImage=size; }SIGPVM  
 bih.biWidth=btm.bmWidth; oG$)UTzGc  
 bih.biXPelsPerMeter=0; L lBN-9p  
 bih.biYPelsPerMeter=0; liR ?  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); :K\mN/ x  
 static int filecount=0; O62b+%~F  
 CString name; pV6d Id  
 name.Format("pict%04d.bmp",filecount++); K1V#cB WO  
 name=m_Path+name; {;2vmx9  
 BITMAPFILEHEADER bfh; ]"c+sMW  
 bfh.bfReserved1=bfh.bfReserved2=0; h^ -. ]Y  
 bfh.bfType=((WORD)('M'<< 8)|'B'); 2+Px'U\  
 bfh.bfSize=54+size; jBaB@LO9G  
 bfh.bfOffBits=54; :'aAZegQY  
 CFile bf; 3E f1bhi  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ /-6S{hl9Ne  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); qO`)F8  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER));  tpy>OT$  
  bf.WriteHuge(lpData,size); 6#j$GH *  
  bf.Close(); $3Z-)m  
  nCount++; 7PR#(ftz  
 } B?$ "\;&  
 GlobalFreePtr(lpData); m/NdJMoN=  
 if(nCount==1) 3] 1-M  
  m_Number.Format("%d picture captured.",nCount); OB ~X/  
 else ExHKw~y9  
  m_Number.Format("%d pictures captured.",nCount); \5Vde%!$Z  
  UpdateData(FALSE); Hi_ G  
} bCZ g cN  
SWp1|.=Sm  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) zqDR7+]  
{ do uc('@  
 if(pMsg -> message == WM_KEYDOWN) XC7%vDIt  
 { B2Xn?i3 l  
  if(pMsg -> wParam == VK_ESCAPE) @"T"7c?Cv  
   return TRUE; i(? ,6)9  
  if(pMsg -> wParam == VK_RETURN) {cpEaOyOM  
   return TRUE; e!fqXVEVR  
 } *&Z7m^`FQ  
 return CDialog::PreTranslateMessage(pMsg); WvHw{^(lF  
} (H oqR  
i&8FBV-  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) PA6=wfc  
{ mAk{"65V  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ .qk]$LJF7  
  SaveBmp(); eMRar<)+#*  
  return FALSE; `.y}dh/+0W  
} d--y  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ jlFk@:y4  
 CMenu pop; !ZDzEP*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m\/ Tj0e  
 CMenu*pMenu=pop.GetSubMenu(0); ^\B :R,  
 pMenu->SetDefaultItem(ID_EXITICON); Kb =@ =Xta  
 CPoint pt; Z ,^9 Z  
 GetCursorPos(&pt); ^I KO2Ft  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); `IYuz:  
 if(id==ID_EXITICON)  p0.|<  
  DeleteIcon(); M4ozTp<$O  
 else if(id==ID_EXIT) K/ &?VIi`z  
  OnCancel(); ND<!4!R^  
 return FALSE; 8@NH%zWBp  
} :Q+5,v-c  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); I ];M7  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) ylKmj]A  
 AddIcon(); 9+,R`v  
 return res; t6c<kIQ:-O  
} v){ .Z^_C  
jkiTj~WE-  
void CCaptureDlg::AddIcon() I8OD$`~*U6  
{ uS&| "*pR  
 NOTIFYICONDATA data; Ax oD8|  
 data.cbSize=sizeof(NOTIFYICONDATA); M5T9JWbN  
 CString tip; xoB},Xl$D  
 tip.LoadString(IDS_ICONTIP); k%[3Q>5iM  
 data.hIcon=GetIcon(0); xUF_1hY  
 data.hWnd=GetSafeHwnd(); RvJ['(-  
 strcpy(data.szTip,tip); >r &;3:"  
 data.uCallbackMessage=IDM_SHELL; va f&X]p  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; sBv>E}*R  
 data.uID=98; Khh0*S8.K  
 Shell_NotifyIcon(NIM_ADD,&data); m~Ld~I"  
 ShowWindow(SW_HIDE); Z%Z9oJ:  
 bTray=TRUE; Gamr6I"K  
} kF7(f|*  
*`( <'Z  
void CCaptureDlg::DeleteIcon() T ^A b!O  
{ lCW8<g^  
 NOTIFYICONDATA data; ~}Z\:#U  
 data.cbSize=sizeof(NOTIFYICONDATA); ,(a5@H$f  
 data.hWnd=GetSafeHwnd(); avmcw~ TF  
 data.uID=98; = sAn,ri  
 Shell_NotifyIcon(NIM_DELETE,&data); p8wyEHB  
 ShowWindow(SW_SHOW); 2tayP@$  
 SetForegroundWindow(); SPj><5Ro  
 ShowWindow(SW_SHOWNORMAL); hO{cvHy`  
 bTray=FALSE; .s/fhk,  
} *9ywXm&?  
Ba\6?K  
void CCaptureDlg::OnChange() 3p?KU-  
{ T+LJ* I4  
 RegisterHotkey(); 7z_;t9Y  
} R`F,aIJ]  
`k\grr.J  
BOOL CCaptureDlg::RegisterHotkey()  TIy&&_p  
{ i` A  
 UpdateData(); M(|   
 UCHAR mask=0; S{',QO*D6  
 UCHAR key=0; >#+IaKL7  
 if(m_bControl) ^ 4%Zvl  
  mask|=4; -ZW0k@5g  
 if(m_bAlt) 9Pd* z>s  
  mask|=2; ;0ME+]`"3  
 if(m_bShift) ! #wdVe_(  
  mask|=1; IB.yU,v  
  key=Key_Table[m_Key.GetCurSel()]; S\y%4}j  
 if(bRegistered){ Z,N$A7SBE  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); 7iu Q9q^&  
  bRegistered=FALSE; w^K^I_2ge  
 } I PE}gp  
 cMask=mask; _eLWQ|6Fx  
 cKey=key; 59(U`X  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); QD{:vG g  
 return bRegistered; 6]Q3Yz^h  
} Ct$82J  
Kex[ >L10G  
  四、小结 0ZAj=u@O  
l2b{u GE  
  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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