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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: wh:`4Yw  
  ^ihXM]1{G  
  一、实现方法 c#;LH5KI  
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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: 4%j&]PASa1  
HwSPOII|8K  
#pragma data_seg("shareddata") n*6',BY  
HHOOK hHook =NULL; //钩子句柄 _?_Svx2  
UINT nHookCount =0; //挂接的程序数目 @;,O V&XYn  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 jIc;jjAF  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 zFuUv_t  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey [%nG_np  
static int KeyCount =0; z(orA} [  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 {nOK*7+ "  
#pragma data_seg() p N]Hp"v  
MgMLfgt"V  
  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。 7<^D7  
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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: .Na>BR\F  
NV-9C$<n2!  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR /9w}[y*E  
cKey,UCHAR cMask) |H_)u  
{ Pe wPl0  
 BOOL bAdded=FALSE; X7c*T /  
 for(int index=0;index<MAX_KEY;index++){ Yhw* `"X  
  if(hCallWnd[index]==0){ khv!\^&DD  
   hCallWnd[index]=hWnd; X-{:.9  
   HotKey[index]=cKey; }\ DQxHG  
   HotKeyMask[index]=cMask; j*:pW;)^  
   bAdded=TRUE; ?s"v0cg+  
   KeyCount++; EShakV  
   break; S s`0;D1  
  } e<^4F%jSK  
 } kyo ,yD  
 return bAdded; 4l`gAE$  
} lIFU7g  
//删除热键 A^p $~e\)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) wD,F=O  
{ WNYLQ=;  
 BOOL bRemoved=FALSE; }C&c=3V  
 for(int index=0;index<MAX_KEY;index++){ 8rpN2M 3h  
  if(hCallWnd[index]==hWnd){ l*m|b""].u  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ ToJru  
    hCallWnd[index]=NULL; VD3[ko  
    HotKey[index]=0; T&23Pf1  
    HotKeyMask[index]=0; rzBWk  
    bRemoved=TRUE; !3&vgvr  
    KeyCount--; "&+0jfLY+  
    break; (P>vI'  
   } +%Gm2e;_u  
  } gwYd4  
 } e#OU {2X  
 return bRemoved; X*yl% V  
} z0W+4meoH  
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YWZF*,4  
  DLL中的钩子函数如下: hB+ t pa  
|}|;OG  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 9,c>H6R7  
{ HYH!;  
 BOOL bProcessed=FALSE; ?3Fo:Z`@F  
 if(HC_ACTION==nCode) 4#YklVm  
 { si;]C~X*  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 d?P aZz{4  
   switch(wParam) 0Yjy  
   {  &4[iC/}  
    case VK_MENU: 1<p"z,c  
     MaskBits&=~ALTBIT; E>1USKxn  
     break; UK<"|2^sT  
    case VK_CONTROL: ]\ezES  
     MaskBits&=~CTRLBIT; *Sf^()5C,  
     break; V V4_  
    case VK_SHIFT: >lW*%{|b$^  
     MaskBits&=~SHIFTBIT; J@TM>R  
     break; 3*TS 4xX  
    default: //judge the key and send message }00e@a  
     break; a wK'XFk  
   } ~Iu09t|a  
   for(int index=0;index<MAX_KEY;index++){ D/Wuan?yPN  
    if(hCallWnd[index]==NULL) <XagkD  
     continue; !jW32$YTR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eBV{B70k  
    { w8i!Qi#y5D  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); HW G~m:km  
     bProcessed=TRUE; S_CtE M  
    } vSA%A47G  
   } 8#Z5-",iw  
  } HKkf+)%)x  
  else if((lParam&0xc000ffff)==1){ //有键按下 VfwD{+ 5  
   switch(wParam) V"ZbKV +[  
   { Uk2q,2  
    case VK_MENU: %E\%nTV  
     MaskBits|=ALTBIT; ezvaAhd{  
     break; |Q;o538  
    case VK_CONTROL: GXRjR\Ch  
     MaskBits|=CTRLBIT; \d+HYLAJn  
     break; bH{aI:9Fb  
    case VK_SHIFT: c" 7pf T  
     MaskBits|=SHIFTBIT; gsp 7N  
     break; OQQ9R?Ll{  
    default: //judge the key and send message k#(cZ  
     break; KIFx &A  
   } ]EnaZWyO]  
   for(int index=0;index<MAX_KEY;index++){ PpRO7(<cD  
    if(hCallWnd[index]==NULL) N96BWgT  
     continue; z{d5Lrk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) wVOL7vh  
    { iL, XBoE  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); Fzs'@*  
     bProcessed=TRUE; Fc~w`~tv  
    } H=#Jg;_w  
   } 1znV>PO!  
  } 2>k)=hl:  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 R6XMBYK^  
   for(int index=0;index<MAX_KEY;index++){ !y`e,(E  
    if(hCallWnd[index]==NULL) C#&6p0U  
     continue; u&xK>7  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ([-=NT}Aq  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); o z{j2%  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 syf"{bBe  
   } 61/zrMPn  
  } 8!GLw-kb  
 } H| U/tU-  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ..!-)q'?  
} X^5"7phI@  
?myXG92  
  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: Zbh]O CN  
8$kXC+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); fNPj8\#V,  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); EiN)TB^]  
F^z8+W  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: i t@}dZ  
Y0\\(0j64  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) I JY5wP1"  
{ i q:Q$z&  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) ^u!Tyb8Dk  
 { Q;O)>K  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 ~x"79=!W  
  SaveBmp(); Rl4zTAI  
  return FALSE; OX/.v?c  
 } PX2k,%  
 …… //其它处理及默认处理 _ D9@<+MS*  
} f<:U"E.  
KBR0p&MN  
s@LNQ|'kO  
  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。 }@%ahRGx%9  
BQ&q<6Tk  
  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。 V )k, 9=  
y32++b!  
  二、编程步骤 ~hslLUE  
m8j-lNu  
  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"; H#6^-6;/  
.Pes{uHg  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; oz6+rM6MY  
i:M*L< +  
  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; .00=U;H%`  
Jav2A6a  
  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; RIEv*2_O  
1bZiPG{  
  5、 添加代码,编译运行程序。 |cGeL[  
#S%Y; ilq  
三、程序代码 vj&5`  
4t Nvq  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL h+~df(S.  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) _G[I2]  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ *;e@t4  
#if _MSC_VER > 1000 ;c- ]bhBB  
#pragma once 2{B(j&{  
#endif // _MSC_VER > 1000 ]p&<nK,  
#ifndef __AFXWIN_H__ Jrd4a~XP  
#error include 'stdafx.h' before including this file for PCH Vt=(2d5:p  
#endif (F[/~~  
#include "resource.h" // main symbols O+p-1 C$\  
class CHookApp : public CWinApp tNuCxb-  
{ j'Y"/<  
 public: 04PoBv~g  
  CHookApp(); .k,Jt+  
  // Overrides )ko{S[gG  
  // ClassWizard generated virtual function overrides @" 0tW:  
  //{{AFX_VIRTUAL(CHookApp) :~3{oZGX&  
 public: f\);HJbg  
  virtual BOOL InitInstance(); M"5!s,  
  virtual int ExitInstance(); kq%gY  
  //}}AFX_VIRTUAL P%@rH@^Y  
  //{{AFX_MSG(CHookApp) :{b6M/  
  // NOTE - the ClassWizard will add and remove member functions here. R mW fV  
  // DO NOT EDIT what you see in these blocks of generated code ! A!W" *WT  
  //}}AFX_MSG \q|7,S,5  
  DECLARE_MESSAGE_MAP() (#B^Hyz!  
}; 6{+_T  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); Wda\a.bXT  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); w"a 9'r  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); L;S*.Ol>  
BOOL InitHotkey(); HIX=MprL<  
BOOL UnInit(); qE`:b0FT  
#endif gJPDNZ*6pk  
mvTyx7 h=  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. `e?;vA&  
#include "stdafx.h" Vv]$\`d#  
#include "hook.h" Q5y q"/=[a  
#include <windowsx.h> e-iYJ?  
#ifdef _DEBUG ,V33v<|wc  
#define new DEBUG_NEW J7ktfyQ0W  
#undef THIS_FILE `xX4!^0Hm  
static char THIS_FILE[] = __FILE__; Xvu)  
#endif P 0Efh?oZ  
#define MAX_KEY 100 Y$x"4=~  
#define CTRLBIT 0x04 R] Disljq  
#define ALTBIT 0x02 "VDk1YX_&l  
#define SHIFTBIT 0x01 G&@-R{i  
#pragma data_seg("shareddata") I[=Wmxa?r  
HHOOK hHook =NULL; nGx ~) T  
UINT nHookCount =0; 9eGCBVW:*  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey ?UZ$bz  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT : _^0'ULP  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey cK|rrwa0  
static int KeyCount =0; wrQydI  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift R2N^'  
#pragma data_seg() 13.{Y)  
HINSTANCE hins; bk7^%O>  
void VerifyWindow(); &gWMl`3^*!  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) @TA8^ND  
//{{AFX_MSG_MAP(CHookApp) JN&MyA"  
// NOTE - the ClassWizard will add and remove mapping macros here. m)@Q_{=6M  
// DO NOT EDIT what you see in these blocks of generated code! Mr=}B6`  
//}}AFX_MSG_MAP K5!";V  
END_MESSAGE_MAP() 3s?v(1 {)  
_b0S  
CHookApp::CHookApp() ,b6kTQq  
{ tg7C;rJ  
 // TODO: add construction code here, {5QosC+o6Q  
 // Place all significant initialization in InitInstance H}h~~7E  
} 0 OAqA?Z  
M)"]$TM  
CHookApp theApp; ~VqFZasV  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) yX7CN5vVl  
{ }c` ?0FQ  
 BOOL bProcessed=FALSE; (B>)2:T1  
 if(HC_ACTION==nCode) TRgY:R_  
 { M8^.19q;  
  if((lParam&0xc0000000)==0xc0000000){// Key up b&=]S(  
   switch(wParam) 7.Ml9{M/i  
   { <`c25ih.4  
    case VK_MENU: v9E+(4I9_  
     MaskBits&=~ALTBIT; &<gUFcw7Ui  
     break; 7szls71/=  
    case VK_CONTROL: j`2B}@2  
     MaskBits&=~CTRLBIT; MV0<^/p|  
     break; 4ef*9|^x#  
    case VK_SHIFT: a9#W9eP  
     MaskBits&=~SHIFTBIT; w::r?.9  
     break; ^273l(CZ1  
    default: //judge the key and send message < Gr9^C  
     break; bbd0ocva  
   } 3D 9N: c  
   for(int index=0;index<MAX_KEY;index++){ Az9X#h.vf  
    if(hCallWnd[index]==NULL) x*unye7  
     continue; Z$!C=  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) @+?+6sS  
    { AA))KBXq  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); >vQ6V'F  
     bProcessed=TRUE; _&W0e}4  
    } kU #:I9PO  
   } k(zs>kiP  
  } 968Ac}OA  
  else if((lParam&0xc000ffff)==1){ //Key down T(Y}V[0+  
   switch(wParam) T@(6hEmP,  
   { #mgA/q?A  
    case VK_MENU: 4dW3'"R"L  
     MaskBits|=ALTBIT; yDd=& T   
     break; 4JGE2ArR  
    case VK_CONTROL: xJvLuzUD  
     MaskBits|=CTRLBIT; u=vh Z%A]  
     break; sL)Rg(rkx  
    case VK_SHIFT: 5{')GTdX>  
     MaskBits|=SHIFTBIT; "w*@R8v  
     break; TkA9tFi  
    default: //judge the key and send message LkaG8#m1R  
     break; G3H#XK D  
   } HjV\lcK:v  
   for(int index=0;index<MAX_KEY;index++) -&trk  
   { azvDvEWCQZ  
    if(hCallWnd[index]==NULL) |xq} '.C  
     continue; M|U';2hZN:  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) %v]7BV^%6  
    { clHM8$  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); ha_@Yqgh  
     bProcessed=TRUE; >RM 0=bO  
    } [/?c@N,  
   } v-ThdE$G#  
  } ^[en3aQ  
  if(!bProcessed){ ?Rlgv5P!  
   for(int index=0;index<MAX_KEY;index++){ Y.E?;iS  
    if(hCallWnd[index]==NULL) wOjv[@d  
     continue; DWuRJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) mDZ=Due1  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); (Ar?QwP9>  
   } AvZXRN1:'  
  } e d_m +NM  
 } GXO4x|08F  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); _~ v-:w  
} otU@X 3<_  
!@( M_Z'  
BOOL InitHotkey() V R"8Di&)  
{ Bk+{}  
 if(hHook!=NULL){ R3$@N  
  nHookCount++; Pfm*<,'x"[  
  return TRUE; rWJ*e Y  
 } ja?s@Y}-9s  
 else \F[n`C"Is  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 4*iHw+%mq  
  if(hHook!=NULL) [1<(VyJ}ye  
   nHookCount++; 02,W~+d1  
  return (hHook!=NULL); &uPDZ#C-  
} dnix:'D1  
BOOL UnInit() t{~@I  
{ 6Hda]y  
 if(nHookCount>1){ : aH%bk  
  nHookCount--; MZ)T0|S_  
  return TRUE; uw_H:-J  
 } ~,T+JX  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Oohq9f#!  
 if(unhooked==TRUE){ )qmFK .;%  
  nHookCount=0; goB;EWz  
  hHook=NULL; gd K*"U  
 } F, zG;_  
 return unhooked; _1P`]+K\D$  
} PzLJ/QER  
YN/u9[=`  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) C *a,<`  
{ `T=1<Twc  
 BOOL bAdded=FALSE; a/34WFC  
 for(int index=0;index<MAX_KEY;index++){ 5.dl>,  
  if(hCallWnd[index]==0){ KhrFg1|  
   hCallWnd[index]=hWnd; %0lf  
   HotKey[index]=cKey; VxkEez'|  
   HotKeyMask[index]=cMask; |e:rYLxm:  
   bAdded=TRUE; :Z[(A"dA  
   KeyCount++; a/ b92*&k  
   break; kB V/rw  
  } >{b3>s~T  
 } };^}2Xo+  
 return bAdded; ]'tJ S]  
} 4b=Gg  
\KCWYi]  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) lr0M<5d=p  
{ zXjw nep  
 BOOL bRemoved=FALSE; AxEc^Cof  
 for(int index=0;index<MAX_KEY;index++){ rEmwKZF'  
  if(hCallWnd[index]==hWnd){ Si]X rub  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ <}cZi4l'  
    hCallWnd[index]=NULL; `4skwvS=  
    HotKey[index]=0; G~(& 3  
    HotKeyMask[index]=0; aV#h5s  
    bRemoved=TRUE; _\UIc;3Gl  
    KeyCount--; l77'Lne  
    break; r,0@~;zA  
   } oK$ '9c5<  
  } :kt/$S^-  
 } I qx84  
 return bRemoved; L/%Y#  
} |*ReqM|_C  
3[.3dy7,Z  
void VerifyWindow() xvB8YW"  
{ {l@WCR  
 for(int i=0;i<MAX_KEY;i++){ .'&V#D0  
  if(hCallWnd!=NULL){ "Vx6 #u@}  
   if(!IsWindow(hCallWnd)){ 6`Lcs  
    hCallWnd=NULL; >O3IfS(l  
    HotKey=0; z-I|h~ii  
    HotKeyMask=0; Ok,HD7  
    KeyCount--; =gs~\q  
   } bM^7g  
  } ~3d*b8  
 } g8'~e{= (  
} 3 1k  
>4M<W4  
BOOL CHookApp::InitInstance() yuv4*  
{ "|hlDe<  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); 8+ hhdy*b  
 hins=AfxGetInstanceHandle(); ` .$&T7  
 InitHotkey(); 14-]esSa  
 return CWinApp::InitInstance(); &//2eL  
} TA|s@T{  
?9Ma^C;}  
int CHookApp::ExitInstance()  E>"8 /  
{ ($'V& x8T  
 VerifyWindow(); .lr5!Stb  
 UnInit(); #"<?_fao~  
 return CWinApp::ExitInstance(); J 3B`Krh  
} t H,sql)  
B$j' /e-Zk  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file h;nQxmJ9  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ^N{k6>;  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ ,\x$q'  
#if _MSC_VER > 1000 tpZ->)1  
#pragma once Wj tft%  
#endif // _MSC_VER > 1000 4kh8W~i;/  
=+\$e1Mb*  
class CCaptureDlg : public CDialog }#bZ8tm&  
{ \OY}GRKt  
 // Construction YD9!=a$  
 public: {mf.!Xev  
  BOOL bTray; wV>c" J  
  BOOL bRegistered; YXRjx .srf  
  BOOL RegisterHotkey(); WL:0R>0  
  UCHAR cKey; c 6q/X*  
  UCHAR cMask; "koo` J  
  void DeleteIcon(); *6P'q4 )  
  void AddIcon(); e=L*&X  
  UINT nCount; \XDmK   
  void SaveBmp(); [8z&-'J=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor cJ/4G l  
  // Dialog Data Yt*vqm[WV  
  //{{AFX_DATA(CCaptureDlg) 4DM*^=9E  
  enum { IDD = IDD_CAPTURE_DIALOG }; d- kZt@DL=  
  CComboBox m_Key; OpUA{P  
  BOOL m_bControl; lQ$+JX;n(y  
  BOOL m_bAlt; 1$(  
  BOOL m_bShift; 6]ZO'Nwo  
  CString m_Path; |6*Va%LYO-  
  CString m_Number; {=iyK/Uf  
  //}}AFX_DATA O2lIlCL  
  // ClassWizard generated virtual function overrides }lO }x  
  //{{AFX_VIRTUAL(CCaptureDlg) 4 4`WYK l  
 public: |]tZ hI"3<  
  virtual BOOL PreTranslateMessage(MSG* pMsg); XWXr0>!,?  
 protected: I=odMw7Hj  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support x`L+7,&n  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }LQ\a8]<  
  //}}AFX_VIRTUAL WUY,. 8  
  // Implementation RY<%'\A`~  
 protected: [xf$VkjuF  
  HICON m_hIcon; IM]h*YV'  
  // Generated message map functions O8y9dX-2  
  //{{AFX_MSG(CCaptureDlg)  p[Hr39o  
  virtual BOOL OnInitDialog(); Fv@tD4I>  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); >f%,`r  
  afx_msg void OnPaint(); JhH`uA&  
  afx_msg HCURSOR OnQueryDragIcon(); 3.FR C  
  virtual void OnCancel(); u# 3)p  
  afx_msg void OnAbout(); ,5w]\z  
  afx_msg void OnBrowse(); q)k{W>O  
  afx_msg void OnChange(); *m&%vj.Kc  
 //}}AFX_MSG K:a3+k d  
 DECLARE_MESSAGE_MAP() 0 Az/fzJlz  
}; 7H#2WFQ7  
#endif @ t|3gF$X  
BfVBywty  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file O]bKNA.5  
#include "stdafx.h" x{?sn  
#include "Capture.h" *v&*% B  
#include "CaptureDlg.h" }H2#H7!H  
#include <windowsx.h> l?<q YjI  
#pragma comment(lib,"hook.lib") +`Fb_m)f  
#ifdef _DEBUG gi1j/j7  
#define new DEBUG_NEW  Oq}ip  
#undef THIS_FILE wE4;Rk1  
static char THIS_FILE[] = __FILE__; vcM~i^24)  
#endif %l;*I?0H  
#define IDM_SHELL WM_USER+1 8,y{q9O  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); :$2Yg[Zc3  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); K( z[ }  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; xG w?'\  
class CAboutDlg : public CDialog :P,2K5]y  
{ }PmTR4F!}  
 public: 0O[l?e4,8{  
  CAboutDlg(); )$h-ZYc  
  // Dialog Data YuA7r"c  
  //{{AFX_DATA(CAboutDlg) DyIV/  
  enum { IDD = IDD_ABOUTBOX }; .jaZ|nN8`  
  //}}AFX_DATA >3!DOv   
  // ClassWizard generated virtual function overrides LyV#j>gD  
  //{{AFX_VIRTUAL(CAboutDlg) *F|+2?a:$  
 protected: RAwk7F3qn  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support nzWQQra|?  
  //}}AFX_VIRTUAL !-ZP*V3}h  
  // Implementation 1@@y]s_.a  
 protected: sS|<&3  
  //{{AFX_MSG(CAboutDlg) >Fp&8p`am  
  //}}AFX_MSG O{nC^`X  
  DECLARE_MESSAGE_MAP() g}YToOs  
}; vbedk+dd?A  
jr:drzr{I  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) |eF.ZC)QWh  
{ ,H@TYw  
 //{{AFX_DATA_INIT(CAboutDlg) b*`fLrqV.  
 //}}AFX_DATA_INIT NA\x<  
} ?Nu#]u-  
&1~Re.* B  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) H) cQO?B  
{ *#6|!%?g  
 CDialog::DoDataExchange(pDX); 2^J/6R$  
 //{{AFX_DATA_MAP(CAboutDlg) 7N6zqjIB  
 //}}AFX_DATA_MAP GZS{&w!  
} G>JxIrN0  
J+i X,X  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) z1FL8=  
 //{{AFX_MSG_MAP(CAboutDlg) Bd8hJA  
 // No message handlers f}%sO  
 //}}AFX_MSG_MAP a}w&dE$!-  
END_MESSAGE_MAP() %; qY  '+  
5c)wZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) aX]y`  
: CDialog(CCaptureDlg::IDD, pParent) Lg b  
{ 1 0V+OIC  
 //{{AFX_DATA_INIT(CCaptureDlg) FbuKZp+  
  m_bControl = FALSE; c[Yq5Bu{y  
  m_bAlt = FALSE; ]a=l^Pc(xN  
  m_bShift = FALSE; PB@-U.Z  
  m_Path = _T("c:\\"); $6Z[|9W^A  
  m_Number = _T("0 picture captured."); ah>Dqb*  
  nCount=0;  t9]r  
  bRegistered=FALSE; sZT VM9<)  
  bTray=FALSE; il7 !}  
 //}}AFX_DATA_INIT %![4d;Z%x  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 f!(cD80  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ?o@E1:aA  
} |\/~ 8qP  
Etdd\^  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) dbd"pR8v  
{ Wz5d| b  
 CDialog::DoDataExchange(pDX); F\:{}782u  
 //{{AFX_DATA_MAP(CCaptureDlg) u>1v~3,r#  
  DDX_Control(pDX, IDC_KEY, m_Key); (a,6a  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 4@gl4&<h  
  DDX_Check(pDX, IDC_ALT, m_bAlt); >|(WS.n3C  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {8_:4`YZ  
  DDX_Text(pDX, IDC_PATH, m_Path);  r^e-.,+  
  DDX_Text(pDX, IDC_NUMBER, m_Number); }WoX9M; 1  
 //}}AFX_DATA_MAP |O2|`"7  
} ^g\h]RD}  
K:C+/O  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) N:5b1TdI,  
//{{AFX_MSG_MAP(CCaptureDlg) ;>sq_4_  
 ON_WM_SYSCOMMAND() []!tT-Gzy  
 ON_WM_PAINT() cz$c)It  
 ON_WM_QUERYDRAGICON() jjNxatAN  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) H9/XW6W,"w  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) EccFx7h  
 ON_BN_CLICKED(ID_CHANGE, OnChange) g}^4^88=a  
//}}AFX_MSG_MAP m79m{!q$-  
END_MESSAGE_MAP() S|tA[klh  
l8eT{!4  
BOOL CCaptureDlg::OnInitDialog() zC[i <'h!T  
{ ^BQ>vI'.4  
 CDialog::OnInitDialog(); >Y44{D\`  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); bXk:~LE  
 ASSERT(IDM_ABOUTBOX < 0xF000); x`wZtv\  
 CMenu* pSysMenu = GetSystemMenu(FALSE); Tm0?[[3hC  
 if (pSysMenu != NULL) [sjrb?Xd  
 { oVAOGHE  
  CString strAboutMenu; A7mMgb_  
  strAboutMenu.LoadString(IDS_ABOUTBOX); !Mm+bWn=mB  
  if (!strAboutMenu.IsEmpty()) l^)o'YS y  
  { HdDo&#  
   pSysMenu->AppendMenu(MF_SEPARATOR); !N@Yh"c  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); Z8N@e<!*~8  
  } lrM.RM96  
 } \z<ws&z3`$  
 SetIcon(m_hIcon, TRUE); // Set big icon }Z<D^Z~w  
 SetIcon(m_hIcon, FALSE); // Set small icon r@\,VD6J  
 m_Key.SetCurSel(0); g4?Q.'dZr  
 RegisterHotkey(); mOABZ#+Fk  
 CMenu* pMenu=GetSystemMenu(FALSE); "87O4 #$  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); a>#d=.  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); (v9!g#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 9_I[o.q   
 return TRUE; // return TRUE unless you set the focus to a control o<9yaQ;  
} _gis+f/8h  
2&3eAJC  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) yOn H&Jj  
{ 5VCMpy  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) bf&.rJ0  
 { RI7qsm6RN  
  CAboutDlg dlgAbout; :5q^\xmmq  
  dlgAbout.DoModal(); rerUM*0  
 } 30wYc &H  
 else o;HdW  
 { h'z+8X_t  
  CDialog::OnSysCommand(nID, lParam); OLhWkN,qA  
 } v)X[gt tf  
} +-xSuR,  
1_p[*h  
void CCaptureDlg::OnPaint() h Kp,4D>2_  
{ ^^20vwq  
 if (IsIconic()) )m$1al  
 { /1s9;'I  
  CPaintDC dc(this); // device context for painting 3Y.d&Nz  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); .2 N_?  
  // Center icon in client rectangle 7=9A_4G!  
  int cxIcon = GetSystemMetrics(SM_CXICON); QH~8 aE_i  
  int cyIcon = GetSystemMetrics(SM_CYICON); ~)oWSo5ll  
  CRect rect; BVwRPt  
  GetClientRect(&rect); d|D'&&&c  
  int x = (rect.Width() - cxIcon + 1) / 2; -;W\f<q]  
  int y = (rect.Height() - cyIcon + 1) / 2; G~Q*:m  
  // Draw the icon 81%qM7v9H  
  dc.DrawIcon(x, y, m_hIcon); w>1l@%U o  
 } +?J_6Mo@X  
 else ,4h! "c  
 { 8VBkIYgb  
  CDialog::OnPaint(); v)v{QNQp^  
 } a!SR"3 k  
} %BT)oH}  
QBN=l\m+  
HCURSOR CCaptureDlg::OnQueryDragIcon() s~IA},F,\  
{ 5,G<}cd  
 return (HCURSOR) m_hIcon; ~Sn5;g8+\  
} Ynk><0g6  
,& \&::R  
void CCaptureDlg::OnCancel() ?trt4Tbe/  
{ z[$9B#P  
 if(bTray) 4q@9  
  DeleteIcon(); 8Pnqmjjj  
  CDialog::OnCancel(); .wt>.mUH  
} 9>} (]T  
!Ed<xG/  
void CCaptureDlg::OnAbout() *cb D&R\  
{ (<AM+|  
 CAboutDlg dlg; MFCbx>#  
 dlg.DoModal(); pXh^M{.  
} 2yQ;lQ`  
nFf\tf%8  
void CCaptureDlg::OnBrowse() Sf.8Ibw  
{ T{v<  
 CString str; 9 up* g  
 BROWSEINFO bi; HCe-]nMd  
 char name[MAX_PATH]; o+6^|RP  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); J T0,Z  
 bi.hwndOwner=GetSafeHwnd(); !@]h@MC$7  
 bi.pszDisplayName=name; K_w0+oY a  
 bi.lpszTitle="Select folder"; *6\`A!C  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; /hA}9+/  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Nsy9 h}+A  
 if(idl==NULL) z? b(|f\!  
  return; ADwwiq#E  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); p1`'1`.3  
 str.ReleaseBuffer(); gen3"\Og{  
 m_Path=str; 7p"~:1hU  
 if(str.GetAt(str.GetLength()-1)!='\\') 6m;wO r  
  m_Path+="\\"; m%[2x#  
 UpdateData(FALSE); DlQ[}5STF  
} C>(M+qXL+  
*Tlws  
void CCaptureDlg::SaveBmp() /n<Ncf  
{ 9O 0  
 CDC dc; j{Qbzczy,  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); &&QDEDszp  
 CBitmap bm; hnfrnYH  
 int Width=GetSystemMetrics(SM_CXSCREEN); QeOt; {_|  
 int Height=GetSystemMetrics(SM_CYSCREEN); S92 !jp/  
 bm.CreateCompatibleBitmap(&dc,Width,Height); MM58w3Mz  
 CDC tdc; #dn%KMo2r  
 tdc.CreateCompatibleDC(&dc); $BO}D  
 CBitmap*pOld=tdc.SelectObject(&bm); BzG!Rg|J  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); `- uZv  
 tdc.SelectObject(pOld); (^@;`8Dy8  
 BITMAP btm; 3\U,Kg  
 bm.GetBitmap(&btm); ?U.&7yY  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; Bbe/w#Z  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); y0mg}N1  
 BITMAPINFOHEADER bih; *MyS7<  
 bih.biBitCount=btm.bmBitsPixel; vng8{Mx90*  
 bih.biClrImportant=0; >=q!!'$:  
 bih.biClrUsed=0; W~@GK  
 bih.biCompression=0;  M$-(4 0  
 bih.biHeight=btm.bmHeight; yKk,);  
 bih.biPlanes=1; G4`sRaT.  
 bih.biSize=sizeof(BITMAPINFOHEADER); p=P0$P+KM  
 bih.biSizeImage=size; iRr& 'k  
 bih.biWidth=btm.bmWidth; M6>\R$  
 bih.biXPelsPerMeter=0; 0T{Y_IG  
 bih.biYPelsPerMeter=0; 9[]"%6  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); gQzJ2LU(  
 static int filecount=0; 0_xcrM  
 CString name; bU +eJU_%  
 name.Format("pict%04d.bmp",filecount++); J;]@?(  
 name=m_Path+name; NB6h/0*v  
 BITMAPFILEHEADER bfh; #L*@~M^]  
 bfh.bfReserved1=bfh.bfReserved2=0; %cjGeS6}  
 bfh.bfType=((WORD)('M'<< 8)|'B'); KL_}:O68  
 bfh.bfSize=54+size; /n3&e  
 bfh.bfOffBits=54; 0o'ML""j  
 CFile bf; Jtk.v49Ad>  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ f`";Q/rG  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,9j:h)ks?  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); =rtA{g$)+  
  bf.WriteHuge(lpData,size); a*wJcJTpV"  
  bf.Close(); x jUH<LFxy  
  nCount++; k~EPVJh"  
 } M&\?)yG  
 GlobalFreePtr(lpData); 8J(zWV7 r  
 if(nCount==1) #di_V"  
  m_Number.Format("%d picture captured.",nCount); ?~y(--.t;T  
 else Cot\i\]jv  
  m_Number.Format("%d pictures captured.",nCount); g1!L. On  
  UpdateData(FALSE); YV!V9   
} (9q{J(44  
N %/DN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) V$F.`O!hfi  
{ S/:QVs  
 if(pMsg -> message == WM_KEYDOWN) T|iF/p]F  
 { &^D@(m7>{K  
  if(pMsg -> wParam == VK_ESCAPE) ~E|V{z%  
   return TRUE; G78j$ ^/0  
  if(pMsg -> wParam == VK_RETURN) %_=R&m'n`  
   return TRUE; U=#ylQ   
 } Z1lF[d,f;  
 return CDialog::PreTranslateMessage(pMsg); U\GZ  
} V4i%|vV  
>\x 39B  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ]SR`96vG  
{ "^e?E:( 3  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ Gbm_xEPC  
  SaveBmp(); M[N.H9  
  return FALSE; z7pXpy \  
} Z!l!3(<G.f  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2}C>{*}yQ  
 CMenu pop; J0W).mD_H  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); TK?+O}v-]!  
 CMenu*pMenu=pop.GetSubMenu(0); !OVEA^6  
 pMenu->SetDefaultItem(ID_EXITICON); kxf=%<l  
 CPoint pt; s ^@Cq=  
 GetCursorPos(&pt); ?Pw \&q  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); +\$|L+@Z  
 if(id==ID_EXITICON) %~(i[Ur;  
  DeleteIcon(); /<(ik&%N  
 else if(id==ID_EXIT) oi4Wxcj  
  OnCancel(); v23Uh2[@Yy  
 return FALSE; 0!\q  
} 7Cp_ 41._  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FAl6  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) u9~J1s<e  
 AddIcon();  y, _3Ks  
 return res; AFUl   
} R*fR?  
myX0<j3G5  
void CCaptureDlg::AddIcon() >^HTghgRD  
{ w:+#,,rwzV  
 NOTIFYICONDATA data; Bzt`9lg  
 data.cbSize=sizeof(NOTIFYICONDATA); E }j8p_p  
 CString tip; r:rJv  
 tip.LoadString(IDS_ICONTIP); fzG1<Gem  
 data.hIcon=GetIcon(0); ]H7Mx\  
 data.hWnd=GetSafeHwnd(); /\I%)B47^9  
 strcpy(data.szTip,tip); l#.,wOO{  
 data.uCallbackMessage=IDM_SHELL; RteTz_ z{  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |Cq J2  
 data.uID=98; eH*b -H[  
 Shell_NotifyIcon(NIM_ADD,&data); -)+DVG.t  
 ShowWindow(SW_HIDE); =_6h{f&Q  
 bTray=TRUE; rM.<Gi05Qe  
} cHct|Z u  
)Dpt<}}\  
void CCaptureDlg::DeleteIcon() {# _C  
{ f+~!s 2uw  
 NOTIFYICONDATA data; eakIK+-21y  
 data.cbSize=sizeof(NOTIFYICONDATA); 4x=Y9w0?8  
 data.hWnd=GetSafeHwnd(); DCUq.q)  
 data.uID=98; ebK wCZwK*  
 Shell_NotifyIcon(NIM_DELETE,&data); agD.J)v\  
 ShowWindow(SW_SHOW); MCG~{#`  
 SetForegroundWindow(); Q kpmPQK  
 ShowWindow(SW_SHOWNORMAL); HN@)/5BY  
 bTray=FALSE; 2` qXD fD`  
} [i#Gqx>'w  
}"k(kH  
void CCaptureDlg::OnChange() Y\\nJuJo  
{ |%;txD  
 RegisterHotkey(); ~riw7"  
} Ih"Ol(W  
H;&t"Ql.  
BOOL CCaptureDlg::RegisterHotkey() .w)t<7 y  
{ %;?3A#  
 UpdateData(); Z`t?kXDNoI  
 UCHAR mask=0; 1=.kH[R  
 UCHAR key=0; 0E1)&f  
 if(m_bControl) +[9"M+4-  
  mask|=4; XLxr~Yo  
 if(m_bAlt) S,%HW87  
  mask|=2; B(dL`]@Xm  
 if(m_bShift) nJg2O@mRJ  
  mask|=1; rM |RGe  
  key=Key_Table[m_Key.GetCurSel()]; ^u,x~nPXg  
 if(bRegistered){  '|T=  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); OG`O i^2  
  bRegistered=FALSE; 0VPa;{i/  
 } 3zHiu*2/!  
 cMask=mask; fTgN2U  
 cKey=key; 'YZs6rcJ  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); [G/X  
 return bRegistered; 3Gv i!h7  
} &X(-C9'j  
zt0 zKXw  
  四、小结 {NDP}UATw  
|;yb *  
  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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