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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: ~g;   
  ,YYVj{~2  
  一、实现方法 VaONd0Z I  
Q%S9fq,q  
  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: R,2P3lv1v@  
W-~n|PX8+  
#pragma data_seg("shareddata") L5YnG_M&  
HHOOK hHook =NULL; //钩子句柄 5II(mSg8  
UINT nHookCount =0; //挂接的程序数目 K*-@Q0"KM{  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 tiPa6tQ  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 WCJxu}!  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey &^&zR(o`  
static int KeyCount =0; d@C&+#QDF  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 o|pT;1a"  
#pragma data_seg() 6.1)IQkO  
>x1p%^cA;=  
  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。 >g ll-&;t  
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  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: %(/!ljh_  
_jU5O;  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR K5t0L!6<+  
cKey,UCHAR cMask) Ck =;1sGh  
{ Sw&!y$ed  
 BOOL bAdded=FALSE; BG&cQr  
 for(int index=0;index<MAX_KEY;index++){ vl E z9/H  
  if(hCallWnd[index]==0){ SzD KByi  
   hCallWnd[index]=hWnd; oPKr* `'  
   HotKey[index]=cKey; <bck~E  
   HotKeyMask[index]=cMask; Ty(@+M~-  
   bAdded=TRUE; Z(>'0]G  
   KeyCount++; ikBYd }5  
   break; |C%Pjl^YkV  
  } '|>9C^E9X  
 } S"mcUU}}  
 return bAdded; kUx&pYv  
} abNV4 ,M  
//删除热键 :K82sCy%5  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) )}%O>%  
{ x"P);su  
 BOOL bRemoved=FALSE; ,tH5e&=U01  
 for(int index=0;index<MAX_KEY;index++){ nP~({ :l8X  
  if(hCallWnd[index]==hWnd){ b IW'c_ ,  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ VQI(Vp|  
    hCallWnd[index]=NULL; Q cjc ,  
    HotKey[index]=0; Y<"7x#AB!  
    HotKeyMask[index]=0; )py{\r9X  
    bRemoved=TRUE; e(F42;$$  
    KeyCount--; }U w&Ny  
    break; jDM w2#<  
   } $2D uB  
  } lOwS&4UT  
 } R =Ws#'  
 return bRemoved; >gKh  
} @XD+'{]  
X;F?:Iw\  
P|2E2=G  
  DLL中的钩子函数如下: t2" (2  
|IoB?^_h  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9vNkZ-1  
{ v4miU;|\  
 BOOL bProcessed=FALSE; /y7M lU9  
 if(HC_ACTION==nCode) p R dk>Ph  
 { I]"96'|N  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 Xd E`d.  
   switch(wParam) ;Yfv!\^|  
   {  $ N']TN  
    case VK_MENU: ,h\sF#|  
     MaskBits&=~ALTBIT;  O|A_PyW  
     break; ?;YC'bF  
    case VK_CONTROL: AB Xl  
     MaskBits&=~CTRLBIT; +QM@VQ  
     break; p47S^gW  
    case VK_SHIFT: iGDLZE+?  
     MaskBits&=~SHIFTBIT; l:6,QaT1  
     break; Uq_j\A;c  
    default: //judge the key and send message 7J28JK  
     break; 1QZ&Mj^^  
   } g>d;|sK  
   for(int index=0;index<MAX_KEY;index++){ Ed0IWPx  
    if(hCallWnd[index]==NULL) KD1=Y80P  
     continue; &AuF]VT  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) xCzebG["  
    { be5,U\&z  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =z?%;4'|  
     bProcessed=TRUE; 3QSZ ZJ  
    } >3:?)  
   } #zrTY9m7  
  } N$Y" c*  
  else if((lParam&0xc000ffff)==1){ //有键按下 )2UZ% ?V#  
   switch(wParam) < XTU8G  
   { ;U: {/  
    case VK_MENU: @`-[;?>  
     MaskBits|=ALTBIT;  %d Ernc$  
     break; k+V6,V)my  
    case VK_CONTROL:  `G1&Z]z  
     MaskBits|=CTRLBIT; ODc9r }  
     break; q(5j(G ;  
    case VK_SHIFT: d0hhMx6$  
     MaskBits|=SHIFTBIT; ;v17K  
     break; H4OhIxK  
    default: //judge the key and send message SxyONp.$\  
     break; T{]~07N?  
   } I fO;S*Qt  
   for(int index=0;index<MAX_KEY;index++){ ^ yh'lh/  
    if(hCallWnd[index]==NULL) _<$>*i R  
     continue; dX8hpQ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) R j~  
    { x# ~ x;)  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 6b8;}],|  
     bProcessed=TRUE; Mh(]3\  
    } <";,GaZQ  
   } 1%M&CX  
  } o01kYBD  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 $(s\{(Wn  
   for(int index=0;index<MAX_KEY;index++){ VZ>On$hp  
    if(hCallWnd[index]==NULL) O2{)WWOT  
     continue; %xwIt~Y  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Nf+b" &Zh`  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); dAP|:&y@  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 3`O?16O  
   } : FAH\  
  } +u@aJ_^  
 } {^{p,9  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _!xD8Di#  
} M-NV_W&M  
y AF+bCXo  
  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: |5I'CNi\  
 g]*  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);  "SN4*  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); @RD+xYm  
&m3.h!dq  
  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: )T907I|  
JXiZB 8}  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ;vhyhP.oM  
{ u^I(Ny  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ,~ ?'Ef80  
 { p6EDQwlf  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 Uu6L~iB  
  SaveBmp(); M"q[p  
  return FALSE; z2ms^Y=j  
 } ?&WYjTU]H  
 …… //其它处理及默认处理 t<uYM  
} :&}odx!-!C  
JGiKBm;  
#gQF'  
  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。 < V\Y@Ei+  
,F+B Wot4  
  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*0S$p<[1  
\8uo{#cL8  
  二、编程步骤 c- $Gpa}M  
fnzy5+9"  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; "re-@Baw  
%k f>&b,Mi  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Kj=gm .  
CozKyt/r7  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; W!$zXwY}(  
UbJ*'eoX  
  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; Qz<d~ N  
iWXc  
  5、 添加代码,编译运行程序。 -y) ,Y |  
/rB{[zk  
三、程序代码 )!9Ifk0KH  
>(9F  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL dtM[E`PL  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) >Dm8m[76  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ &'|B =7  
#if _MSC_VER > 1000 i;\s.wrzH  
#pragma once jdut4 nFc  
#endif // _MSC_VER > 1000 cl[!`Z  
#ifndef __AFXWIN_H__ R U"/2i  
#error include 'stdafx.h' before including this file for PCH V|Tud  
#endif !KS F3sz  
#include "resource.h" // main symbols hPm>tV2X  
class CHookApp : public CWinApp 4FeEGySow  
{ x  FJg  
 public: F SMj  
  CHookApp(); KM?1/KZ/~  
  // Overrides 9G?ldp8  
  // ClassWizard generated virtual function overrides V+MK'<#B  
  //{{AFX_VIRTUAL(CHookApp) t *6loS0+  
 public: "vF MSY  
  virtual BOOL InitInstance(); 9pWy"h$H  
  virtual int ExitInstance(); `ue[q!Qq  
  //}}AFX_VIRTUAL 2f,B$-#  
  //{{AFX_MSG(CHookApp) wjU.W5IR  
  // NOTE - the ClassWizard will add and remove member functions here. H! r &aP  
  // DO NOT EDIT what you see in these blocks of generated code ! ; ~ 4k7Uz  
  //}}AFX_MSG 'E;W  
  DECLARE_MESSAGE_MAP() =y ]Jl,_.  
}; cH`^D?#se  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); >X}{BDMb.  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Rz <OF^Iy  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); +}7fg82)  
BOOL InitHotkey(); n"{X!(RIcx  
BOOL UnInit(); kka"C]!  
#endif 7 &)]) {Q  
>O{7/)gS^  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. {5:Zl<0  
#include "stdafx.h" I %_MV  
#include "hook.h" =6%|?5G  
#include <windowsx.h> AMlV%U#  
#ifdef _DEBUG 1IH[g*f  
#define new DEBUG_NEW "Tbnxx]J  
#undef THIS_FILE '8`T|2   
static char THIS_FILE[] = __FILE__; /"AvOh*  
#endif .CV _\  
#define MAX_KEY 100 tiQ;#p7%  
#define CTRLBIT 0x04 8:;#,Urr  
#define ALTBIT 0x02 D!> d0k,Y  
#define SHIFTBIT 0x01 e$l 6gY  
#pragma data_seg("shareddata") LVtu*k   
HHOOK hHook =NULL; 9Ld9N;rWm#  
UINT nHookCount =0; <bmLy_":  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey - V) R<  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT 'w<BJTQIL  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey jp<VK<s]  
static int KeyCount =0; iLq#\8t^  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift "e62/Ejg%  
#pragma data_seg() f@z*3I;  
HINSTANCE hins; ziL^M"~2  
void VerifyWindow(); tB6k|cPC  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ," R>}kPli  
//{{AFX_MSG_MAP(CHookApp) Dx+ K+(  
// NOTE - the ClassWizard will add and remove mapping macros here. bkQ3c-C<  
// DO NOT EDIT what you see in these blocks of generated code! Vu]h4S:  
//}}AFX_MSG_MAP SE`l(-tL  
END_MESSAGE_MAP() (O5)wej   
`.BR= ['O  
CHookApp::CHookApp() UmP'L!  
{ 2R@%Y/  
 // TODO: add construction code here, 9U<Hf32  
 // Place all significant initialization in InitInstance %xg"Q |  
} ?ApRJm:T  
!oMt_k X  
CHookApp theApp; c~tAvDX  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) jXIEp01  
{ d'zT:g  
 BOOL bProcessed=FALSE; aWvd`qA9r  
 if(HC_ACTION==nCode) 'h *Zc}Q:  
 { 1r4,XSk  
  if((lParam&0xc0000000)==0xc0000000){// Key up sbla`6Fb  
   switch(wParam) B=zMYi  
   { RO oE%%8I  
    case VK_MENU: ,IjdO(?TC  
     MaskBits&=~ALTBIT; M\UWWb&%\  
     break; ]h@{6N'oNS  
    case VK_CONTROL: Q4%IxR?  
     MaskBits&=~CTRLBIT; rSyaZ6#  
     break; 8~5|KO >F  
    case VK_SHIFT: =lrN'$z?%  
     MaskBits&=~SHIFTBIT; #v8Cy|I  
     break; _i@x@:_l  
    default: //judge the key and send message u2lmwE  
     break; 6FjVmje  
   } D44I"TgqD  
   for(int index=0;index<MAX_KEY;index++){ !#.vyBK#  
    if(hCallWnd[index]==NULL) v MWC(m  
     continue; \Da~p9 T&  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @3 "DBJ  
    { hEcYpng~  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); #NF+UJYJ&'  
     bProcessed=TRUE; >sV Bj(f  
    } -A@U0=o  
   } P%!q1`Eke(  
  } 4~WlP,,M  
  else if((lParam&0xc000ffff)==1){ //Key down ZOHRUm  
   switch(wParam) nO [QcOf  
   { h.LSMU (O  
    case VK_MENU: qS82/e)7  
     MaskBits|=ALTBIT;  * D3  
     break; ^V,@=QL3U  
    case VK_CONTROL: &|] Fg5  
     MaskBits|=CTRLBIT; gD40y\9r  
     break; hGKdGu`0  
    case VK_SHIFT: @}{VM)Fc+  
     MaskBits|=SHIFTBIT; V9]uFL  
     break; 5oa]dco  
    default: //judge the key and send message Sl~C0eO  
     break; k`Y,KuBpM  
   } k7[)g]u  
   for(int index=0;index<MAX_KEY;index++) / GZV_H%v  
   { :O#gJob-%s  
    if(hCallWnd[index]==NULL) Q,TaJ]  
     continue; {r X5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) lMPbLF%_  
    { rN'k4V"K  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u"joCZ7`kG  
     bProcessed=TRUE; h!;MBn`8  
    } ceI [hM  
   } vev8l\  
  } ,XP@ pi  
  if(!bProcessed){ '|+=B u  
   for(int index=0;index<MAX_KEY;index++){ .P x,=56$X  
    if(hCallWnd[index]==NULL) ^f"&}%"M  
     continue; 6P6Jx;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) k dUc&  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); QD6Z=>?S  
   } l>33z_H^  
  } ";58B} ki  
 } _"`/^L`Q?  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); P:vX }V |[  
} k.ww-nH  
j[BgP\&,  
BOOL InitHotkey() !-@SS>  
{ wf^cyCR0  
 if(hHook!=NULL){ _4De!q0(  
  nHookCount++; lHRK'? Q  
  return TRUE; ^&e;8d|f{  
 } QTJrJD  
 else ol1AD: Ho  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ]dQZ8yVK  
  if(hHook!=NULL) |Yg}WHm  
   nHookCount++; <`b|L9  
  return (hHook!=NULL); f61]`@Bk  
} l$qmn$Uc  
BOOL UnInit() HKT{IP+7(L  
{ (rMTW+,  
 if(nHookCount>1){ ]*;RHy9  
  nHookCount--; `jt(DKB+J  
  return TRUE; zh?xIpY  
 } o<Ke3?J\  
 BOOL unhooked = UnhookWindowsHookEx(hHook); 8~rT  
 if(unhooked==TRUE){ .jy)>"h0  
  nHookCount=0; P/HHWiD`D  
  hHook=NULL; ],WwqD=  
 } k0R, !F  
 return unhooked; [)B@  
} puk4D  
_LLW{^V  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) *YMXiYJR  
{ YlxUx  
 BOOL bAdded=FALSE; VN1# 8{  
 for(int index=0;index<MAX_KEY;index++){ LH1BZ(5g  
  if(hCallWnd[index]==0){ +X{cN5Y K  
   hCallWnd[index]=hWnd; UX+?0K  
   HotKey[index]=cKey; ,(zcl$A[  
   HotKeyMask[index]=cMask;  U5T^S  
   bAdded=TRUE; (p}9^Y  
   KeyCount++; :a#|  
   break; #zh6=.,7  
  } |2tSUOZ  
 } kvY} yw7  
 return bAdded; :ga 9Db9P  
} 9iiU,}M`j  
w?*'vF_2:#  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) 4"rb&$E   
{ vWZ>Hf]`L  
 BOOL bRemoved=FALSE; _ +u sn.  
 for(int index=0;index<MAX_KEY;index++){ K7YT0cG  
  if(hCallWnd[index]==hWnd){ 9G=A)j  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <5C=i:6%  
    hCallWnd[index]=NULL; 9} IVNZc  
    HotKey[index]=0; fLf#2EA  
    HotKeyMask[index]=0; jauc*347  
    bRemoved=TRUE; w`w ` q'  
    KeyCount--; \f ~u85  
    break; ?^F*"+qI  
   }  'lSnyW{  
  } OpbszSl"y  
 } hA$c.jJr.Z  
 return bRemoved; )L&n)w  
} y?rK5Yos  
T(t <Ay?c  
void VerifyWindow() [0( E>vm  
{ {3_Ffsg`  
 for(int i=0;i<MAX_KEY;i++){ j@!BOL~?  
  if(hCallWnd!=NULL){ c=uBT K*  
   if(!IsWindow(hCallWnd)){ Zi15wE  
    hCallWnd=NULL; 1D#T+t`[  
    HotKey=0; 2\kC_o97  
    HotKeyMask=0; VhJyWH%(  
    KeyCount--; 6Vu}k K)  
   } OoA5!HEh  
  } ?}!gLp  
 } W_Ws3L1;N  
} htNL2N  
@p?b"?QaB  
BOOL CHookApp::InitInstance() 3(XHF3q  
{ [v>Z(  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); Al;%u0]5  
 hins=AfxGetInstanceHandle(); Q)7L^  
 InitHotkey(); {g23[$X]N  
 return CWinApp::InitInstance(); y"%iD`{  
} QmDhZ04f  
QZz{74]n  
int CHookApp::ExitInstance() TWD|1 di0  
{ ]y$V/Ij=qK  
 VerifyWindow(); C>\h?<s  
 UnInit(); GhchfI.  
 return CWinApp::ExitInstance(); D|8sjp4  
} uH~ TugQ~  
+A.a~Stt  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file @8x6#|D  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 3e!a>Gl*  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 6kmZ!9w0|  
#if _MSC_VER > 1000 jQw`*Y/,  
#pragma once HT1dvC$COo  
#endif // _MSC_VER > 1000 519:yt   
8{U]ATx'(  
class CCaptureDlg : public CDialog !Barc ,kA  
{ C$]%1<-Iv]  
 // Construction ,sQ0atk7ma  
 public: Ra15d^  
  BOOL bTray; eO[Cb]Dy:  
  BOOL bRegistered; bo?3E +B  
  BOOL RegisterHotkey(); ]CtoK%k  
  UCHAR cKey; d"e%tsj  
  UCHAR cMask; OL6xMToP  
  void DeleteIcon(); #xJGuYdv  
  void AddIcon(); R)DNFc:  
  UINT nCount; 8 MACbLY  
  void SaveBmp(); WPh |~]by<  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor m}'t'l4 c  
  // Dialog Data UHsrZgIRYT  
  //{{AFX_DATA(CCaptureDlg) o )}<   
  enum { IDD = IDD_CAPTURE_DIALOG }; ytcG6WN3  
  CComboBox m_Key; Ty,)mx){)  
  BOOL m_bControl; `!>dbR&1  
  BOOL m_bAlt; Jr*S2 z<*  
  BOOL m_bShift; U{:(j5m  
  CString m_Path; Z2pN<S{5  
  CString m_Number; \w@_(4")Qb  
  //}}AFX_DATA Rs( CrB/M  
  // ClassWizard generated virtual function overrides H--*[3".  
  //{{AFX_VIRTUAL(CCaptureDlg) q4#f *]  
 public: Y|qixpP  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9OO_Hp#|9  
 protected: BD-c 0-+m  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ,oi`BOh  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); wDC/w[4:  
  //}}AFX_VIRTUAL &l!{!f4  
  // Implementation po](6V  
 protected: { ves@p>?  
  HICON m_hIcon; |?t8M9[Z  
  // Generated message map functions >cr_^(UW&  
  //{{AFX_MSG(CCaptureDlg) >Qbc(}w  
  virtual BOOL OnInitDialog(); ?U9d3] W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); p9] 7g%  
  afx_msg void OnPaint(); 2ZzD^:V[}  
  afx_msg HCURSOR OnQueryDragIcon(); +hvIJv ?  
  virtual void OnCancel(); "!_ 4%z-  
  afx_msg void OnAbout(); 94k)a8-!  
  afx_msg void OnBrowse(); la"A$Tbu~  
  afx_msg void OnChange(); G*w W&R)  
 //}}AFX_MSG re 1k]  
 DECLARE_MESSAGE_MAP() g:3'x/a1  
}; ]OCJ~Zw  
#endif cTIwA:)D  
CTrs\G  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file BQJ`vIa  
#include "stdafx.h" D` `NQ`>A  
#include "Capture.h" _*?"[TYfX  
#include "CaptureDlg.h" P@S;>t{TD  
#include <windowsx.h> 8KELN(o$ 7  
#pragma comment(lib,"hook.lib") 8iH;GFNJ7'  
#ifdef _DEBUG rjf=qh5s  
#define new DEBUG_NEW 2;(iTPz +  
#undef THIS_FILE /5'<w(  
static char THIS_FILE[] = __FILE__; vaCdfO&  
#endif x_iy;\s1  
#define IDM_SHELL WM_USER+1 R&|)y:bg|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); u$@I/q,ou  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g!) LhE  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Kac j  
class CAboutDlg : public CDialog V<7K!<g)b  
{ n#L2cv~Aj"  
 public: @p` CAB  
  CAboutDlg(); JE:n`l/p  
  // Dialog Data m ?"%&|  
  //{{AFX_DATA(CAboutDlg) /zP)2q^  
  enum { IDD = IDD_ABOUTBOX }; V-U  ^O45  
  //}}AFX_DATA lXk-86[M  
  // ClassWizard generated virtual function overrides 2WECQl=r  
  //{{AFX_VIRTUAL(CAboutDlg) ]Q_G /e  
 protected: 4bJ2<j  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #vZ]2Ud= 2  
  //}}AFX_VIRTUAL 0N[DV]  
  // Implementation .yh2ttf<gB  
 protected: {S: 3 FI  
  //{{AFX_MSG(CAboutDlg) uV$d7(N}"  
  //}}AFX_MSG &*:)5F5  
  DECLARE_MESSAGE_MAP() 7LZb*+>  
}; y<x_v )k-  
JO6vzoS3  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) kkBV;v%a  
{ =28H^rK{  
 //{{AFX_DATA_INIT(CAboutDlg) 1eyyu!  
 //}}AFX_DATA_INIT BG?2PO{  
} h _7;UQH  
KA{DN!  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) GvtI-\h]  
{ V5@[7ncVf  
 CDialog::DoDataExchange(pDX); ue:P#] tx  
 //{{AFX_DATA_MAP(CAboutDlg) :-@P3F[0  
 //}}AFX_DATA_MAP d*:qFq_  
} Ol h%"=*;  
wQuaB6E  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0]w[wc <  
 //{{AFX_MSG_MAP(CAboutDlg) #YYvc`9  
 // No message handlers ]B'  
 //}}AFX_MSG_MAP c1!/jTX$  
END_MESSAGE_MAP() jG ;(89QR/  
b0=AQ/:  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) jL).B&  
: CDialog(CCaptureDlg::IDD, pParent) T:~W.3  
{ Y'H/ $M N  
 //{{AFX_DATA_INIT(CCaptureDlg) xdU pp~}+.  
  m_bControl = FALSE; _$_CR\$  
  m_bAlt = FALSE; FT<*  
  m_bShift = FALSE; z>g& ?vo2  
  m_Path = _T("c:\\"); Ywk[VD+.  
  m_Number = _T("0 picture captured."); kJpHhAn4  
  nCount=0; 2Xs< 1rF  
  bRegistered=FALSE; $"n)C  
  bTray=FALSE; <=2*UD |  
 //}}AFX_DATA_INIT  k*6eZ7  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 oc%le2   
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); XlJux_LD:  
}  %!h+  
aYCzb7  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4xn^`xf9  
{ a} 7KpKCD  
 CDialog::DoDataExchange(pDX); #UeU:RJ1  
 //{{AFX_DATA_MAP(CCaptureDlg) _7H J'  
  DDX_Control(pDX, IDC_KEY, m_Key); OL"5A18;M  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); <l/Qf[V  
  DDX_Check(pDX, IDC_ALT, m_bAlt); !e"m*S.(6{  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); ZoReyY2  
  DDX_Text(pDX, IDC_PATH, m_Path); PCnJ2  
  DDX_Text(pDX, IDC_NUMBER, m_Number); E1w XG  
 //}}AFX_DATA_MAP kV9NFo22  
} /j\TmcnU^  
%9)J-B  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) %D0Ws9:|  
//{{AFX_MSG_MAP(CCaptureDlg) $K6`Q4`  
 ON_WM_SYSCOMMAND() :%]R x&08  
 ON_WM_PAINT() oDI*\S>  
 ON_WM_QUERYDRAGICON() 9TS=>  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -^Va]Lk  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) b:I5poI3  
 ON_BN_CLICKED(ID_CHANGE, OnChange) -7VV5W  
//}}AFX_MSG_MAP 1c~#]6[  
END_MESSAGE_MAP() e1}0f8%  
iL' ]du<wk  
BOOL CCaptureDlg::OnInitDialog() leJd) {  
{ HD|)D5wH|  
 CDialog::OnInitDialog(); j=QjvWD  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &c ~)z\$  
 ASSERT(IDM_ABOUTBOX < 0xF000); X^^D[U  
 CMenu* pSysMenu = GetSystemMenu(FALSE); TL:RB)- <  
 if (pSysMenu != NULL) h;[Nc j]  
 { T=Q{K|JE  
  CString strAboutMenu; $oj<yH<i  
  strAboutMenu.LoadString(IDS_ABOUTBOX); D];([:+4  
  if (!strAboutMenu.IsEmpty()) cSDCNc*%  
  { Z}StA0F_  
   pSysMenu->AppendMenu(MF_SEPARATOR); Fa^]\:  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); p}X87Zq  
  } - $/{V&?t  
 } !Shh$iz  
 SetIcon(m_hIcon, TRUE); // Set big icon r26Wysi~%  
 SetIcon(m_hIcon, FALSE); // Set small icon >maz t=,  
 m_Key.SetCurSel(0); ..mz!:Zs0  
 RegisterHotkey(); _J;a[Ky+[  
 CMenu* pMenu=GetSystemMenu(FALSE); Hf|:A(vCx  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); w2AWdO6  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); R;2 -/MT-  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 7Wn]l!  
 return TRUE; // return TRUE unless you set the focus to a control r5wXuA,Um  
} \ .s".aA  
4;{CR. D  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) f#b[KB^Z,2  
{ G dY^}TJrh  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) "S#hzrEdYI  
 { z H4#\d  
  CAboutDlg dlgAbout; &>t1A5  
  dlgAbout.DoModal(); Xxw.{2Ji!q  
 } j'n= Xh  
 else j`l K}  
 { _zwuK1e  
  CDialog::OnSysCommand(nID, lParam); M/;g|J jM  
 } ^Tmmx_Xw  
} j pV  
s yvi/6  
void CCaptureDlg::OnPaint() 1!#ZEI C  
{ Pw.+DA  
 if (IsIconic()) /RJSkF+!  
 { \ziF(xTvqG  
  CPaintDC dc(this); // device context for painting FgaBwd^W  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); jX@9849@  
  // Center icon in client rectangle CB)#; |aDB  
  int cxIcon = GetSystemMetrics(SM_CXICON); Z^S!w;eu  
  int cyIcon = GetSystemMetrics(SM_CYICON); Vtri"G8 aB  
  CRect rect; (#k#0T kE  
  GetClientRect(&rect); Pw{+7b$  
  int x = (rect.Width() - cxIcon + 1) / 2; nfB9M1Svn  
  int y = (rect.Height() - cyIcon + 1) / 2; hi uPvi}  
  // Draw the icon R5zV= N  
  dc.DrawIcon(x, y, m_hIcon); 1tc9STYR}  
 } +__Rk1CVh  
 else S0yT%V  
 { uM#/  
  CDialog::OnPaint(); mQJGKh&Pk  
 } dGjvSK<1@  
} K2Zy6lGOZ  
\3/'#  
HCURSOR CCaptureDlg::OnQueryDragIcon() qsx1:Ny 1  
{ ktRdf6:~  
 return (HCURSOR) m_hIcon;  VVY\W!  
} +a;j>hh  
i|Wn*~yFOO  
void CCaptureDlg::OnCancel() RJM(+5xQ|  
{ /2 N%Z  
 if(bTray) d-aF-  
  DeleteIcon(); hRu%> =7  
  CDialog::OnCancel(); L_|Y_=r."  
} +/tD$  
GS%Dn^l  
void CCaptureDlg::OnAbout() I'wAgf6W  
{ X)+N>8o?N  
 CAboutDlg dlg; ^xrR3m*d  
 dlg.DoModal(); ]gZjV  
} KNhH4K2iP8  
DGnswN%n1  
void CCaptureDlg::OnBrowse() xB#E&}Ho  
{ LtBH4 A  
 CString str; Ql 1# l:Q  
 BROWSEINFO bi; Mv3Ch'X[  
 char name[MAX_PATH]; &V L<Rx  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); .Pi67Kj,  
 bi.hwndOwner=GetSafeHwnd(); >Ko )Z&j9W  
 bi.pszDisplayName=name; >xN^#$ng}  
 bi.lpszTitle="Select folder"; gUcE,L  
 bi.ulFlags=BIF_RETURNONLYFSDIRS;  CgWj9 [  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); j06DP _9M  
 if(idl==NULL) ?}.(k/  
  return; {U9jA_XX  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Df9}YI ;?  
 str.ReleaseBuffer(); 57r)&8  
 m_Path=str; .IgQn|N  
 if(str.GetAt(str.GetLength()-1)!='\\') jQhf)B  
  m_Path+="\\"; 03PVbDq-  
 UpdateData(FALSE); =Ao;[j)*!  
} I~I%z'"RQd  
F 7=-k/k  
void CCaptureDlg::SaveBmp() 6~s,j({^  
{ iu .{L(m  
 CDC dc; NKRXY~zHh  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); =|V3cM4'  
 CBitmap bm; shB(kb{{  
 int Width=GetSystemMetrics(SM_CXSCREEN); 2%I:s6r  
 int Height=GetSystemMetrics(SM_CYSCREEN); t9}XO M*  
 bm.CreateCompatibleBitmap(&dc,Width,Height); f  W )  
 CDC tdc; ?#'qY6 ^  
 tdc.CreateCompatibleDC(&dc); $W2AiE[Wm  
 CBitmap*pOld=tdc.SelectObject(&bm); +J} 41  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY);  E9i WGSE  
 tdc.SelectObject(pOld); x9=lN^/4  
 BITMAP btm; -:QyWw/d  
 bm.GetBitmap(&btm); `#V"@Go  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; *VU Xw@  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); U7W ct %  
 BITMAPINFOHEADER bih; 6!$S1z#wM  
 bih.biBitCount=btm.bmBitsPixel; bu.36\78  
 bih.biClrImportant=0; ocMf}"  
 bih.biClrUsed=0; ,#A,+!4  
 bih.biCompression=0; ) E\pQ5&  
 bih.biHeight=btm.bmHeight; @l8?\^N  
 bih.biPlanes=1; SCo9[EJ  
 bih.biSize=sizeof(BITMAPINFOHEADER); eIO}/npT]Q  
 bih.biSizeImage=size; d3\8BKp  
 bih.biWidth=btm.bmWidth; I.>LG  
 bih.biXPelsPerMeter=0; 1L0ku@%t9Y  
 bih.biYPelsPerMeter=0; z(xvt>  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8P 8"dN[  
 static int filecount=0; $#!~K2$  
 CString name; YANEdH`d  
 name.Format("pict%04d.bmp",filecount++); +38t82%YWo  
 name=m_Path+name; VYwaU^  
 BITMAPFILEHEADER bfh; s-*XAn ot  
 bfh.bfReserved1=bfh.bfReserved2=0; >dM'UpN@  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Wwz>tE  
 bfh.bfSize=54+size; PIA&s6U  
 bfh.bfOffBits=54; N  P"z  
 CFile bf; gR+Z"]  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ;?rW`e2  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); +0OQ"2^&  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); {`'b+0[;@  
  bf.WriteHuge(lpData,size); 5q<kt{06\  
  bf.Close(); JsC0^A;fM  
  nCount++; *,. {Xf  
 } 4Vs;Y&t]  
 GlobalFreePtr(lpData); ka hv1s-  
 if(nCount==1) ?z6C8T~+  
  m_Number.Format("%d picture captured.",nCount); ]8^2(^3ct  
 else XEuv aM  
  m_Number.Format("%d pictures captured.",nCount); Vf@/}=X *  
  UpdateData(FALSE); 2#R"#Q!  
} FR <wp  
eZv0"FK X  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) t!k 0n&P  
{ 9we=aX5  
 if(pMsg -> message == WM_KEYDOWN) rEViw?^KT  
 { S.I<Hs  
  if(pMsg -> wParam == VK_ESCAPE) <[q)2 5RL  
   return TRUE; A-~)7-  
  if(pMsg -> wParam == VK_RETURN) X>CYKRtb  
   return TRUE; DFiexOb  
 } 5u&jNU5m_  
 return CDialog::PreTranslateMessage(pMsg); mB\5bSFY`  
} u,C-U!A  
b&ADj8cKC  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) C{Fo^-3  
{ 4e:hKv,+4  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ qUo(hbp  
  SaveBmp(); @ f$P*_G   
  return FALSE; q<1@ut  
} K,RIa0)  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ D,7! /u'  
 CMenu pop; #8`G&S*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); >A)he!I  
 CMenu*pMenu=pop.GetSubMenu(0); ua{eri[  
 pMenu->SetDefaultItem(ID_EXITICON); 9> |rIw  
 CPoint pt; HG^8&uh]  
 GetCursorPos(&pt); hk=+t&Y<H  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); D&'".N,}  
 if(id==ID_EXITICON) [:o#d`^  
  DeleteIcon(); ~5|a9HV:  
 else if(id==ID_EXIT) ^mGTZxO  
  OnCancel(); _V;J7Vz  
 return FALSE; wjl? @K  
} Kb}N!<Z*  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); QW!'A`*x  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) y0Tb/&xN  
 AddIcon(); LC}]6  
 return res; (]pQ.3  
} O-7 \qz  
hOq1 "kL  
void CCaptureDlg::AddIcon() ' Sl9xd  
{ E>ev/6ox  
 NOTIFYICONDATA data; g5cR.]oz  
 data.cbSize=sizeof(NOTIFYICONDATA); |h'ugx1iY  
 CString tip; |XsW)/  
 tip.LoadString(IDS_ICONTIP); cx02b-O  
 data.hIcon=GetIcon(0); .`iq+i~  
 data.hWnd=GetSafeHwnd(); l"- D@]"  
 strcpy(data.szTip,tip); oU2RxK->u  
 data.uCallbackMessage=IDM_SHELL; K)k!`du!6  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; YziQU_  
 data.uID=98; cx$Oh`-Car  
 Shell_NotifyIcon(NIM_ADD,&data); vb%\q sf  
 ShowWindow(SW_HIDE); tpVtbh1)u  
 bTray=TRUE; 3w-0v"j U  
} mF_/Rhu  
$q+7 ,,"  
void CCaptureDlg::DeleteIcon() snK/,lm.  
{ [Nq4<NK  
 NOTIFYICONDATA data; H95VU"  
 data.cbSize=sizeof(NOTIFYICONDATA); hIdGQKr>V  
 data.hWnd=GetSafeHwnd(); ,Pl[SMt!  
 data.uID=98; 7(oxmv}#Q  
 Shell_NotifyIcon(NIM_DELETE,&data); Q:-/@$&i  
 ShowWindow(SW_SHOW); E/am^ TO`  
 SetForegroundWindow(); <l\FHJhjq  
 ShowWindow(SW_SHOWNORMAL); K<t(HK#[  
 bTray=FALSE; I5e!vCG)  
} ^c2 8Q.<w(  
]s<Q-/X  
void CCaptureDlg::OnChange() aH:eu<s  
{ Ji7A9Hk  
 RegisterHotkey(); ;[|x5o /<  
} gcz1*3)  
j;'NJ~NZ$  
BOOL CCaptureDlg::RegisterHotkey() ~v5tx  
{ ljk-xC p/  
 UpdateData(); _Q7)FK  
 UCHAR mask=0; @P8q=j}l9  
 UCHAR key=0; m{1By/U  
 if(m_bControl) >s{[d$  
  mask|=4; lUp 7#q  
 if(m_bAlt) :gR`rc!  
  mask|=2; <}e<Zf!  
 if(m_bShift) 1mB6rp  
  mask|=1; UgUW4x'+  
  key=Key_Table[m_Key.GetCurSel()]; jW6@U%[!b  
 if(bRegistered){ wOOPuCw?  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); kt@+UK."  
  bRegistered=FALSE; h rZ\ O?j  
 } Qdtfi1_Y1  
 cMask=mask; ";GLX%C!{@  
 cKey=key; 9eV@v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F:\y#U6"J  
 return bRegistered; tvg7mU]l  
} Yu8WmX,[  
"BTA"  
  四、小结 6I>W(_T  
 u2DsjaL  
  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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