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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: Vg23!E  
  FC*[*  
  一、实现方法 oE~Bq/p  
i?~3*#IpD  
  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: "vGW2~*)  
Ru~j,|0r4  
#pragma data_seg("shareddata") C-[1iW'  
HHOOK hHook =NULL; //钩子句柄 ?rIx/>C9  
UINT nHookCount =0; //挂接的程序数目 03(4 x'z  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 4&f3%eTi  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 D0q ":WvE  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey eY\y E"3  
static int KeyCount =0; yWya&|D9  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 EZj9wd"u  
#pragma data_seg() ^H' \"9;7  
_y3Xb`0a  
  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。 %#}Zy   
9E tz[`|  
  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: X$pJ :M{F$  
HdG2X  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR m_l[MG\  
cKey,UCHAR cMask) )Beiu*  
{ F/A|(AH'  
 BOOL bAdded=FALSE; l (%1jC8  
 for(int index=0;index<MAX_KEY;index++){ 1r7y]FyH$  
  if(hCallWnd[index]==0){ F3N6{ysK#  
   hCallWnd[index]=hWnd; 3Hm/(C  
   HotKey[index]=cKey; "}JZU!?  
   HotKeyMask[index]=cMask; <rmvcim{*  
   bAdded=TRUE; V/;B3t~f  
   KeyCount++; i@ BtM9:  
   break; ~WN:DXn  
  } Jq^T1_iqn  
 } -S+zmo8  
 return bAdded; -Vhw^T1iV  
} I0 RvnMw  
//删除热键 `V3Fx{  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "x /OIf  
{ V#}kwON  
 BOOL bRemoved=FALSE; &yol_%C  
 for(int index=0;index<MAX_KEY;index++){ ~3S~\0&|  
  if(hCallWnd[index]==hWnd){ e NafpK  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ |B2+{@R  
    hCallWnd[index]=NULL; .y,0[i V N  
    HotKey[index]=0; IyPnp&_  
    HotKeyMask[index]=0; f>Jr|#k  
    bRemoved=TRUE; SC])?h-Fw  
    KeyCount--; 7fX<511(  
    break; m<g~H4  
   } 5Zva:  
  } Y7[jqb1D  
 } Vl!6W@g  
 return bRemoved; PIpi1v*qz  
} Iy3GE[  
[R7Y}k:9U  
`I5wV/%ib  
  DLL中的钩子函数如下: #`X?=/q  
;l-!)0 U  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) f:.I0 ST  
{ q=qcm`ce  
 BOOL bProcessed=FALSE; 4vV:EF-  
 if(HC_ACTION==nCode) 9v!1V,`j"  
 { A7hVHxNJ-  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 y {<9]'  
   switch(wParam) [bNx^VP*  
   {  VD]zz ^  
    case VK_MENU: a,#j =  
     MaskBits&=~ALTBIT;  H =^`!  
     break; 3nnJ8zQ  
    case VK_CONTROL: Z} r*K%  
     MaskBits&=~CTRLBIT; -n<pPau2  
     break; ,V:SN~P66+  
    case VK_SHIFT: A1?2*W  
     MaskBits&=~SHIFTBIT; TSWM |#u':  
     break; YNj`W1  
    default: //judge the key and send message +|89>}w4  
     break; 3az&<Pqb  
   } "?I y(*^  
   for(int index=0;index<MAX_KEY;index++){ r[Hc>wBv  
    if(hCallWnd[index]==NULL) >:!X.TG$  
     continue; nl,uuc*;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) E6gI,f/p0X  
    { #PQB(=299P  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 9dUravC7  
     bProcessed=TRUE; *zL}&RUKM  
    } i`$*T y"x  
   } j578)!aJ  
  } =k0_eX0  
  else if((lParam&0xc000ffff)==1){ //有键按下  J@Q7p}  
   switch(wParam) rOOT8nkR#  
   { }\:Nu Tf  
    case VK_MENU: "#oHYz3D  
     MaskBits|=ALTBIT; bPt!yI:  
     break; Z>Wg*sZy)  
    case VK_CONTROL: hPePB=  
     MaskBits|=CTRLBIT; V<uR>TD(  
     break; lun\`f 5Q  
    case VK_SHIFT: W_8wed:b  
     MaskBits|=SHIFTBIT; ~`\?"s:  
     break; 0dh aAq`k  
    default: //judge the key and send message #& Rw&  
     break; {U m)15K  
   } YccH+[X;  
   for(int index=0;index<MAX_KEY;index++){ }h!f eP  
    if(hCallWnd[index]==NULL) '*w00  
     continue; =4PV;>X  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))  &NK,VB;  
    { FZ,#0ZYJGP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); pd;br8yE$@  
     bProcessed=TRUE; ,N[7/kT|  
    } Slher0.Y  
   } I3mGo  
  } Sf7\;^  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 _p&]|~a  
   for(int index=0;index<MAX_KEY;index++){ v+`N*\J_  
    if(hCallWnd[index]==NULL) a8iQ4   
     continue; -~30)J=e`  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ,\ k(x>oy  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); s,=i_gyPQ  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 =L:4i\4  
   } 7/f3Z 1g  
  } TbGn46!:  
 } 3.W@ }   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); <|+Ex  
} 4V COKx  
[uq$5u  
  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: WP+oFkw>  
Vz)`nmO}5\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b6F4>@gjg  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); m{uxI za  
5>j)kx=J9  
  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: $!(pF  
WKIoS"?-F  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 7MHKeLq  
{ @I/]D6 ~"  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) @$c\d vO  
 { U,q\em R  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 5nO% Ke=  
  SaveBmp(); NchXt6$i9  
  return FALSE; ;u(<h?%e  
 } SNE#0L' }  
 …… //其它处理及默认处理 ?1$fJ3  
} [uls8 "^/j  
T{Uc:Z  
B'EKM)dA  
  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。 :8+Nid)  
[YT>*BH?  
  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{7DA&C  
4^Q :  
  二、编程步骤 )5U[o0td  
5qoSEI-m  
  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"; <l9-;2L4  
^?]%sdT q  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; ),!;| bh  
FR!? #!  
  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; '07P&g-  
!M]\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; bk^TFE1l  
q^L<X)  
  5、 添加代码,编译运行程序。 Za8#$`zq  
8o 0%@5M  
三、程序代码 V6#K2  
pL%r,Y_^\x  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Zg`Mz _?  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) G 0;XaL:  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ L^4-5`gj  
#if _MSC_VER > 1000 5-0{+R5v  
#pragma once s)2fG\1  
#endif // _MSC_VER > 1000 w MP  
#ifndef __AFXWIN_H__ (S`2[.j  
#error include 'stdafx.h' before including this file for PCH ADk8{L{UU  
#endif (%o2jroQ#  
#include "resource.h" // main symbols YxinE`u~  
class CHookApp : public CWinApp NDAw{[.%  
{ $aPfGZ<i  
 public: <rL/B k  
  CHookApp(); TkO[rAC  
  // Overrides gzD@cx?V  
  // ClassWizard generated virtual function overrides ?9=9C"&s  
  //{{AFX_VIRTUAL(CHookApp) m7GR[MR  
 public: ee#): -p  
  virtual BOOL InitInstance(); A4?+T+#d  
  virtual int ExitInstance(); STw#lU) %(  
  //}}AFX_VIRTUAL ~/ilx#d  
  //{{AFX_MSG(CHookApp) ^T,Gu-2>  
  // NOTE - the ClassWizard will add and remove member functions here. =.`qixN  
  // DO NOT EDIT what you see in these blocks of generated code ! hyT1xa  
  //}}AFX_MSG d/e|'MPX  
  DECLARE_MESSAGE_MAP() [e4]"v`N  
}; 2kUxD8BcN  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); y tf b$;|  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); cl*PFQp9j  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q 9&kJ%Mo  
BOOL InitHotkey(); 2{.QjYw^  
BOOL UnInit(); 9A7@ 5F  
#endif y{a$y}7#X  
{gaai  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. S$^ RbI  
#include "stdafx.h" v^7LctcVm  
#include "hook.h" 5 VA(tzmCt  
#include <windowsx.h> Mf#83 <&K  
#ifdef _DEBUG }/,CbKi,+  
#define new DEBUG_NEW gxGrspqg  
#undef THIS_FILE x/ :4 {  
static char THIS_FILE[] = __FILE__; Y}DonF  
#endif 45H!;Q sk  
#define MAX_KEY 100 @i3bgx>_o  
#define CTRLBIT 0x04 Q9`QL3LQD  
#define ALTBIT 0x02 x)_@9ldYv  
#define SHIFTBIT 0x01 7gS1~Q4\V2  
#pragma data_seg("shareddata") cubk]~VD  
HHOOK hHook =NULL; 6R29$D|HFO  
UINT nHookCount =0; g3%t8O/M  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey T^}  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT g+C!kaC)  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey a/uo}[Y  
static int KeyCount =0; ? QDWuPhN  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift :;!\vfZbU  
#pragma data_seg() Ut)r&?  
HINSTANCE hins; 1 Ee>S\9t  
void VerifyWindow(); xDO7A5  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) :Ld!mRZF  
//{{AFX_MSG_MAP(CHookApp) 0X(]7b&~R  
// NOTE - the ClassWizard will add and remove mapping macros here. =BZ?-mIU  
// DO NOT EDIT what you see in these blocks of generated code! u.|~$yP.!  
//}}AFX_MSG_MAP *V;3~x!  
END_MESSAGE_MAP() 7e&\{*  
XL}<1- }  
CHookApp::CHookApp() G;oFTP>o  
{ >LF&EM]  
 // TODO: add construction code here, g9my=gY  
 // Place all significant initialization in InitInstance 7XyOB+aQO  
} BvSIM%>h  
396R$\q  
CHookApp theApp; IdM*5Y>f  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 2#_38=K=@  
{ BZ F,=v  
 BOOL bProcessed=FALSE; 8Xm@r#Oy5  
 if(HC_ACTION==nCode) q?~Rnv  
 { fV ZW[9[  
  if((lParam&0xc0000000)==0xc0000000){// Key up =J |sbY"]  
   switch(wParam) s!6=|SS7  
   { Dr"/3xm  
    case VK_MENU: Y&'8VdW  
     MaskBits&=~ALTBIT; O=jN&<rb  
     break; &(&  
    case VK_CONTROL: hE!7RM+Y  
     MaskBits&=~CTRLBIT; Z-|li}lDr  
     break; (clU$m+oXX  
    case VK_SHIFT: F$hZRZ  
     MaskBits&=~SHIFTBIT; {&nV4c$v  
     break; ;WI]vn  
    default: //judge the key and send message ,{j4  
     break; BQjam+u6  
   } t^@T`2jL  
   for(int index=0;index<MAX_KEY;index++){ =wA5P@  
    if(hCallWnd[index]==NULL) mpef]9  
     continue; 4=p@2g2"H  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) FWTx&Ip  
    { _F8T\f |  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); _@ i>s,  
     bProcessed=TRUE; vO$ra5Z  
    } =FBIrw{w  
   } {of]/ 3=  
  } NdQ%:OKC  
  else if((lParam&0xc000ffff)==1){ //Key down <7g Ml  
   switch(wParam) Uh+jt,RB`  
   { d1NE%hg3  
    case VK_MENU: YMAQ+A!  
     MaskBits|=ALTBIT; 8t9aHla  
     break; O: u%7V/  
    case VK_CONTROL: YkbO&~.  
     MaskBits|=CTRLBIT; #S i|!  
     break; uiK:*[  
    case VK_SHIFT: ;? 8Iys#  
     MaskBits|=SHIFTBIT; =QiT)9q)  
     break; MYTS3(  
    default: //judge the key and send message f8!l7{2%q  
     break; *tAqt2{48  
   } h>tsis'N9  
   for(int index=0;index<MAX_KEY;index++) R`C.ha  
   { )[DpK=[N^p  
    if(hCallWnd[index]==NULL) Y\u_+CG*  
     continue; \DyKtrnm%  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 3"B+xbe=  
    { hgj0tIi/  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); t~~r-V":  
     bProcessed=TRUE; u<q)SQ1  
    } {Pvr??"r  
   } bBFwx@  
  } D'?]yyrf  
  if(!bProcessed){ ./)j5M  
   for(int index=0;index<MAX_KEY;index++){ dp< au A  
    if(hCallWnd[index]==NULL) Hf.xd.Yw  
     continue; ZE ^u.>5  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) $Q,n+ /  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); WnO DDr  
   } Q^q=!/qQ  
  } I tgH>L'  
 } |3|wdzV  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); 4Qhx[Hv>(  
} |N6mTB2  
z.A4x#>-  
BOOL InitHotkey() 4Q/r[x/&C  
{ AYYRxhv_,  
 if(hHook!=NULL){ 9$EH K  
  nHookCount++; n\ Gg6Y  
  return TRUE; hF9B?@n?B  
 } M;> ha,x  
 else v6KL93  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); hX %s]"  
  if(hHook!=NULL) ! 7Nn ]Lx  
   nHookCount++; SUSc  
  return (hHook!=NULL); TLX^~W[gOm  
} wbl ${@4  
BOOL UnInit() =sL(^UISl  
{ *;Ak5.du  
 if(nHookCount>1){ T?Z OHH8  
  nHookCount--; \v.HG] /u  
  return TRUE; Y<de9Z@  
 } ^v#+PyW  
 BOOL unhooked = UnhookWindowsHookEx(hHook); E]1\iV  
 if(unhooked==TRUE){ G) jG!`I  
  nHookCount=0; ~igRg~k:/  
  hHook=NULL; 0%#t[us Y  
 } h#vL5At  
 return unhooked; Q1K"%  
} K@y-)I2]  
nz}]C04:-  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) %+/f'6kR  
{ u;$I{b@M]  
 BOOL bAdded=FALSE; OE5X8DqQe  
 for(int index=0;index<MAX_KEY;index++){ D[+|^,^>  
  if(hCallWnd[index]==0){ nm<L&11  
   hCallWnd[index]=hWnd; &f$a1#O}dx  
   HotKey[index]=cKey; aA7S'[NjB  
   HotKeyMask[index]=cMask; 3`mC"a b /  
   bAdded=TRUE; [B.W1 GL!  
   KeyCount++; f|;HS!$  
   break; o:p{^D@#k  
  } ,P;8 }yQ  
 } r[Zg 2  
 return bAdded;  gvvFU,2  
} C!CaGf=  
/5Gnb.zN)  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) $%lHj+(  
{ {mKpD  
 BOOL bRemoved=FALSE; *Cc$eR]-  
 for(int index=0;index<MAX_KEY;index++){ kfH9Y%bOy  
  if(hCallWnd[index]==hWnd){ yYVW"m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 54, Ju'r  
    hCallWnd[index]=NULL; D'U\]'.  
    HotKey[index]=0; wWp?HDl"M  
    HotKeyMask[index]=0; o{s4.LKK  
    bRemoved=TRUE; NB~*sP-l&  
    KeyCount--; &lOXi?&"  
    break; %D%e:se  
   } A- <.#  
  } P}w^9=;S  
 } J tn&o"C  
 return bRemoved; =|DkD- O  
} 8' WLm  
P,s)2s'nZ  
void VerifyWindow() <"j"h=tm}  
{ d#M?lS>  
 for(int i=0;i<MAX_KEY;i++){ +'{:zN5m  
  if(hCallWnd!=NULL){ fb;hf:B:  
   if(!IsWindow(hCallWnd)){ 72B zvY.  
    hCallWnd=NULL; 5VY%o8xXa  
    HotKey=0; Y6[]wUJ  
    HotKeyMask=0; ul]m>W  
    KeyCount--; j$JV(fz  
   } ]xVL11p  
  } *(_ON$+3  
 } 3oNt]2w/'  
} \dQ2[Ek  
b W`)CWd  
BOOL CHookApp::InitInstance() g]TI8&tP!L  
{ 42H#n]Y  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); /Wta$!X{-  
 hins=AfxGetInstanceHandle(); dnhpWV hn  
 InitHotkey(); Qcy+ {j]  
 return CWinApp::InitInstance(); ek_i{'hFd  
} Jg?pW:}R  
5,I*F9[3  
int CHookApp::ExitInstance() //@sktHsw(  
{ 4'u|L&ow  
 VerifyWindow(); >LRaIU>  
 UnInit(); WA)lk>(+  
 return CWinApp::ExitInstance(); N'q/7jOy  
} Ky{I&}+R|  
=V4_DJ(&  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file TBLk+AR  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 62KW HB9S  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ [pyXX>:M  
#if _MSC_VER > 1000 Wg3WE1V  
#pragma once ~(L<uFU V  
#endif // _MSC_VER > 1000 I n%yMH8  
1\9BO:<K  
class CCaptureDlg : public CDialog '$&(+>)z `  
{ (\[!,T"[  
 // Construction fn"jYSy  
 public: nD{;4$xP`  
  BOOL bTray; Y3F.hk}O  
  BOOL bRegistered; fCo2".Tk  
  BOOL RegisterHotkey(); OA5md9P;d  
  UCHAR cKey; c^/?VmCQ}  
  UCHAR cMask; Ns] 9-D  
  void DeleteIcon(); ur_"m+  
  void AddIcon(); XdXS^QA .s  
  UINT nCount; u\\niCNA  
  void SaveBmp(); )#TJw@dNf^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor 0}3'h#33=  
  // Dialog Data ;$&5I9N  
  //{{AFX_DATA(CCaptureDlg) _ O71r}4  
  enum { IDD = IDD_CAPTURE_DIALOG }; yeh adm\  
  CComboBox m_Key; sA7K ;J})  
  BOOL m_bControl; F1]PYx$X  
  BOOL m_bAlt; At_Y$N:  
  BOOL m_bShift; XhkL)) FcG  
  CString m_Path; AZ@Zo'  
  CString m_Number; %>}7 $Y%  
  //}}AFX_DATA ;eSf4_~  
  // ClassWizard generated virtual function overrides i: uA&9  
  //{{AFX_VIRTUAL(CCaptureDlg) wOl-iN=  
 public: +as\>"Cj+2  
  virtual BOOL PreTranslateMessage(MSG* pMsg); @G-k]IWi  
 protected: ].+G-<.:  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ~Am %%$  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); {Ao^3vB  
  //}}AFX_VIRTUAL l.'E\3Bo  
  // Implementation !ZcA Ltq  
 protected: w%u[~T7OI  
  HICON m_hIcon; cB'4{R@e  
  // Generated message map functions ZQ8Aak  
  //{{AFX_MSG(CCaptureDlg) |?b"my$g$  
  virtual BOOL OnInitDialog(); #j5^/*XW  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); X-WvKH(=w  
  afx_msg void OnPaint(); { J%$.D(/  
  afx_msg HCURSOR OnQueryDragIcon(); ~}l,H:jk@  
  virtual void OnCancel(); Ceb i9R[  
  afx_msg void OnAbout(); &3/H P)*<]  
  afx_msg void OnBrowse(); g9Qxf%}  
  afx_msg void OnChange(); s'w 0pZqj  
 //}}AFX_MSG oW9rl]+  
 DECLARE_MESSAGE_MAP() C#cEMKa  
}; AH,F[ vS  
#endif P"VLGa  
bhT]zsBK  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file %'< qhGJ  
#include "stdafx.h" 5~5ypQj  
#include "Capture.h" t;6/bT-  
#include "CaptureDlg.h" cK/odOi  
#include <windowsx.h> sZ$ ~abX  
#pragma comment(lib,"hook.lib") L zy|<:K+$  
#ifdef _DEBUG q+Q)IVaU81  
#define new DEBUG_NEW [K QZHIe  
#undef THIS_FILE 0\ ;a:E.c  
static char THIS_FILE[] = __FILE__; pr?(5{BL  
#endif (J#3+I  
#define IDM_SHELL WM_USER+1 JC3)G/m(03  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?Fw/c0  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); a#$%xw  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ak&v/%N  
class CAboutDlg : public CDialog IA!Kp g W  
{ W5{e.eI}|  
 public: Ss}0.5Bq  
  CAboutDlg(); Reo0ZU>  
  // Dialog Data v}i}pQ\DK  
  //{{AFX_DATA(CAboutDlg) djM=QafB:C  
  enum { IDD = IDD_ABOUTBOX }; E$ rSrT(  
  //}}AFX_DATA {F[Xe_=#"  
  // ClassWizard generated virtual function overrides F*H}5yBp_:  
  //{{AFX_VIRTUAL(CAboutDlg) N<WFe5  
 protected: r8$TT\?~  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support @TDcj~oR ?  
  //}}AFX_VIRTUAL mYvm_t9  
  // Implementation '@P[fSQ  
 protected: ~E~J*R Ze  
  //{{AFX_MSG(CAboutDlg) MN4}y5  
  //}}AFX_MSG /|f]L9)2<  
  DECLARE_MESSAGE_MAP() HVp aVM  
}; .}wir,  
}rZp(FG@*  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lB-7.  
{ E83nEUs  
 //{{AFX_DATA_INIT(CAboutDlg) V"XN(Fd^  
 //}}AFX_DATA_INIT DFMWgBL  
} Pe.D[]S  
q)X&S*-<o~  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) lVHJ}(<'p  
{ y-mmc}B>N  
 CDialog::DoDataExchange(pDX); i^(<E0vS  
 //{{AFX_DATA_MAP(CAboutDlg) ikC;N5Sw  
 //}}AFX_DATA_MAP 8*X8U:.0o  
} |rQ;|+.  
"]<Ut{Xb  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) ]M/w];:  
 //{{AFX_MSG_MAP(CAboutDlg) p*Cbe\  
 // No message handlers x,+zw9  
 //}}AFX_MSG_MAP 4kiu*T  
END_MESSAGE_MAP() a/1{tDA  
-oj@ c OZ  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?a% u=G  
: CDialog(CCaptureDlg::IDD, pParent) Y]PZ| G)  
{ 'JydaF~>  
 //{{AFX_DATA_INIT(CCaptureDlg) eM}Xn^}  
  m_bControl = FALSE; {sLh=iK  
  m_bAlt = FALSE; [(hENX}o :  
  m_bShift = FALSE; IaB A2  
  m_Path = _T("c:\\");  6O}r4*  
  m_Number = _T("0 picture captured."); .Kx5Kh {  
  nCount=0; [M.Vu  
  bRegistered=FALSE; 51A>eU|  
  bTray=FALSE; iiu\_ a=0b  
 //}}AFX_DATA_INIT BmZd,}{  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 AbB%osz}Ed  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); _<8n]0lX3  
} @S{,g;8  
.._wTOSq  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) <H.Ml>q:r  
{ s<myZ T$  
 CDialog::DoDataExchange(pDX); 2 IGAZ%%  
 //{{AFX_DATA_MAP(CCaptureDlg) p&7>G-.  
  DDX_Control(pDX, IDC_KEY, m_Key); z;-2xD0&U[  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 0F"xU1z,  
  DDX_Check(pDX, IDC_ALT, m_bAlt); u+*CpKR}  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); 5i0<BZDTef  
  DDX_Text(pDX, IDC_PATH, m_Path); ']V 2V)t  
  DDX_Text(pDX, IDC_NUMBER, m_Number); \ZA%"F){  
 //}}AFX_DATA_MAP tw;`H( UZ^  
} W6Hiqu+  
2a{eJ89f  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) +m"iJW0  
//{{AFX_MSG_MAP(CCaptureDlg) "*UHit;"+{  
 ON_WM_SYSCOMMAND() jYU#] |k~  
 ON_WM_PAINT() j0Q ;OKu  
 ON_WM_QUERYDRAGICON() I)6)~[:'  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) sGV%O=9?2  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) e|`&K"fnq  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 46*?hA7@r(  
//}}AFX_MSG_MAP ~q<U E\H  
END_MESSAGE_MAP() U!('`TYe  
)J 0'We  
BOOL CCaptureDlg::OnInitDialog() $v+g3+7  
{ >J4_/p>Qs  
 CDialog::OnInitDialog(); +_+}^Nf]Y3  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); x ha!.&DO  
 ASSERT(IDM_ABOUTBOX < 0xF000); C6GYhG]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); yHCBf)N7\  
 if (pSysMenu != NULL) J6jrtLh  
 { &DgIykqN  
  CString strAboutMenu; WO]dWO6Mm  
  strAboutMenu.LoadString(IDS_ABOUTBOX); .t\5H<z  
  if (!strAboutMenu.IsEmpty()) m|'TPy  
  { Jyvc(~x  
   pSysMenu->AppendMenu(MF_SEPARATOR); Rf7py)  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); D>05F,a  
  } 9v^MZ ^Y{  
 } e KET8v[  
 SetIcon(m_hIcon, TRUE); // Set big icon LTrn$k3}  
 SetIcon(m_hIcon, FALSE); // Set small icon --y .q~d  
 m_Key.SetCurSel(0); Krz[ f  
 RegisterHotkey(); < jfi"SJu  
 CMenu* pMenu=GetSystemMenu(FALSE); %T!UEl`v  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); oMcX{v^"  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); ,_p_p^Ar\4  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z?X ^7<  
 return TRUE; // return TRUE unless you set the focus to a control !<@Zf4m  
} jRzR`>5  
0/;T\9  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) "h\{PoG  
{ W%) foJ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) R:zjEhH )  
 { P5kkaLzG  
  CAboutDlg dlgAbout; _<&IpT{w+  
  dlgAbout.DoModal(); t/pHdxX*C7  
 } x-Yt@}6mvl  
 else U_Id6J]8  
 { WnU"&XZ  
  CDialog::OnSysCommand(nID, lParam); }fUV*U:3  
 } TAIcp*)ZM  
} 5Y JLR;  
d'J))-*#UO  
void CCaptureDlg::OnPaint() qK#\k@E  
{ =#SKN\4  
 if (IsIconic()) g.Z>9(>;Y  
 { Y<I/y  
  CPaintDC dc(this); // device context for painting /\(0@To  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); P%(pbG-X.  
  // Center icon in client rectangle b> Iq k  
  int cxIcon = GetSystemMetrics(SM_CXICON);  Hi|'  
  int cyIcon = GetSystemMetrics(SM_CYICON); @?f3(G h,  
  CRect rect; ^;!A`t  
  GetClientRect(&rect); 6uOR0L  
  int x = (rect.Width() - cxIcon + 1) / 2; /!uxP~2U  
  int y = (rect.Height() - cyIcon + 1) / 2; 48Z{wV,  
  // Draw the icon UXnd~DA  
  dc.DrawIcon(x, y, m_hIcon); /k l0(='  
 } `b+f^6SJn  
 else [89#8|+  
 { !i2=zlpb[  
  CDialog::OnPaint(); y/'2WO[  
 } "n=`{~F  
} L Lm{:T7  
#swzZyM$  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1BmevE a)  
{ ~ucOQVmz@  
 return (HCURSOR) m_hIcon; h)~KD%  
} D N GNc  
eh&?BP?  
void CCaptureDlg::OnCancel() 7AX<>^  
{ &>ii2% 4  
 if(bTray) SL? ! RQ  
  DeleteIcon(); x~?,Wv|cm  
  CDialog::OnCancel(); u I}S9  
} k9vr6We'  
MMN2X xS  
void CCaptureDlg::OnAbout() 7  g8SK  
{ hHm &u^xY  
 CAboutDlg dlg; #KF:(2  
 dlg.DoModal(); ]8NNxaE3(  
} rp6Y&3p.  
:_~UO^*h  
void CCaptureDlg::OnBrowse() CS)&A4`8  
{ J^R))R=  
 CString str; Z,M?!vK  
 BROWSEINFO bi; tV<}!~0,*  
 char name[MAX_PATH]; m"t\@f  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); DN2K4%cM%'  
 bi.hwndOwner=GetSafeHwnd(); y\$B9KX  
 bi.pszDisplayName=name; @NWjYHM[`  
 bi.lpszTitle="Select folder"; &^Zo}F2V  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; 8p,q9Ey  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); zW,m3~XX:  
 if(idl==NULL) LYhgBG,   
  return; 7L|w~l7R~  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 9$c0<~B\  
 str.ReleaseBuffer(); 1&\_|2  
 m_Path=str; 8  k9(iS  
 if(str.GetAt(str.GetLength()-1)!='\\') IsxPm9P2<  
  m_Path+="\\"; 0}2Uj>!i  
 UpdateData(FALSE); ?7 e|gpQ|  
} 4(o: #9I  
iJv4%|9  
void CCaptureDlg::SaveBmp() =u QCm#  
{ sesr`,m.,  
 CDC dc; [X ]\^   
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); gQ3Co./  
 CBitmap bm; VI,z7 \  
 int Width=GetSystemMetrics(SM_CXSCREEN);  LKieOgX  
 int Height=GetSystemMetrics(SM_CYSCREEN); 0 60<wjX6  
 bm.CreateCompatibleBitmap(&dc,Width,Height); ](a*R  
 CDC tdc; vmK<_xbwd  
 tdc.CreateCompatibleDC(&dc); 3Q*K+(`{  
 CBitmap*pOld=tdc.SelectObject(&bm); g e)g?IP4  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 5Al 59]  
 tdc.SelectObject(pOld); !/znovoD  
 BITMAP btm; Ck8`$x&t  
 bm.GetBitmap(&btm); rVowHP  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; :BKY#uH~  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 'uBXSP#  
 BITMAPINFOHEADER bih; +Gqh  
 bih.biBitCount=btm.bmBitsPixel; d!7cIYVZ  
 bih.biClrImportant=0; x^^;/%p  
 bih.biClrUsed=0; . \M@oF  
 bih.biCompression=0; zB/$*Hd  
 bih.biHeight=btm.bmHeight; +6@".<  
 bih.biPlanes=1; #qWa[kB  
 bih.biSize=sizeof(BITMAPINFOHEADER); k<wX??'  
 bih.biSizeImage=size; hPF9y@lh  
 bih.biWidth=btm.bmWidth; &1YAPxX  
 bih.biXPelsPerMeter=0; jo{[*]Oa  
 bih.biYPelsPerMeter=0; hu%rp{m^,  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); jCqs^`-  
 static int filecount=0; 2LGeRw  
 CString name; ,+<NP}Yg#G  
 name.Format("pict%04d.bmp",filecount++); s`GwRH<#  
 name=m_Path+name; :$."x '  
 BITMAPFILEHEADER bfh; 0M(\xO  
 bfh.bfReserved1=bfh.bfReserved2=0; u:tLO3VfJ  
 bfh.bfType=((WORD)('M'<< 8)|'B'); O&!>C7  
 bfh.bfSize=54+size; u'M \m7  
 bfh.bfOffBits=54; 9$8B)x  
 CFile bf; -'3~Y 2#  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ SjV;& 1Z/  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); |_/q0#"  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); wG6>.`:  
  bf.WriteHuge(lpData,size); VeeQmR?u-  
  bf.Close(); YA9Xe+g  
  nCount++; &l2oyQEF)  
 } ^_ L'I%%[  
 GlobalFreePtr(lpData); &+;z`A'|8  
 if(nCount==1) v?BX 4FO  
  m_Number.Format("%d picture captured.",nCount); S]mXfB(mh  
 else q|BR-0yi  
  m_Number.Format("%d pictures captured.",nCount); TbbtD"b?  
  UpdateData(FALSE); \)'s6>58|  
} z}&w7 O#   
d?^bCf+<  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) b!Pz~faXD  
{ hi4#8W  
 if(pMsg -> message == WM_KEYDOWN) swV/M i>  
 { ua[ d  
  if(pMsg -> wParam == VK_ESCAPE) Z~)Bh~^A  
   return TRUE; MLg+ 9y  
  if(pMsg -> wParam == VK_RETURN) XM o#LS  
   return TRUE; E+-ah vk  
 } ]`39E"zY  
 return CDialog::PreTranslateMessage(pMsg); de{@u<Y Zb  
} a[d6@!  
 Xr'Y[E [  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) w:%3]2c  
{ gz8>uGx&V!  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ tmEF7e`(o  
  SaveBmp(); 6S7 =+>  
  return FALSE; uj#bK 7  
} KY 085Fvs  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ gI<e=|J6w  
 CMenu pop; xQ4 5B` $  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 9>,$q"M}?  
 CMenu*pMenu=pop.GetSubMenu(0); nP`#z&C  
 pMenu->SetDefaultItem(ID_EXITICON);  Za,rht  
 CPoint pt; k\(LBZ"vR  
 GetCursorPos(&pt); CqHCJ '  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); NvCq5B$C  
 if(id==ID_EXITICON) Hw[(v[v  
  DeleteIcon(); A/ppr.  
 else if(id==ID_EXIT) 5WJof`M  
  OnCancel(); V*]cF=W[A  
 return FALSE; S5B12P  
} 4rkj$  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); \$;Q3t3  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) \/=w \Tj  
 AddIcon(); EG=~0j~  
 return res; 8K(3{\J[V  
} F?"#1j e  
qz]b8rX  
void CCaptureDlg::AddIcon() ?[<C,w~$`  
{ }EFMJ,NQ  
 NOTIFYICONDATA data; xF|P6GXg  
 data.cbSize=sizeof(NOTIFYICONDATA); PEA<H0  
 CString tip; qu>5 rg-  
 tip.LoadString(IDS_ICONTIP); )0F\[Jl}  
 data.hIcon=GetIcon(0); Iu(j"b#  
 data.hWnd=GetSafeHwnd(); _g{*;?mS  
 strcpy(data.szTip,tip); E1'| ;}/  
 data.uCallbackMessage=IDM_SHELL; g+CTF67  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; B_Qi  
 data.uID=98; 6k14xPj  
 Shell_NotifyIcon(NIM_ADD,&data); 2AN6(k4o  
 ShowWindow(SW_HIDE); H{&o_  
 bTray=TRUE; $~ 6Y\O  
} KBVW <;C$  
`bXP )$  
void CCaptureDlg::DeleteIcon() NR98I7  
{ . Y@)3  
 NOTIFYICONDATA data; 24 )Sf  
 data.cbSize=sizeof(NOTIFYICONDATA); fK-tvP0}*  
 data.hWnd=GetSafeHwnd(); wXj!bh8\r  
 data.uID=98; ;4E(n  
 Shell_NotifyIcon(NIM_DELETE,&data); W=Y?_Oz  
 ShowWindow(SW_SHOW); 'j6)5WL$  
 SetForegroundWindow(); BNA`Cc1VV  
 ShowWindow(SW_SHOWNORMAL); M{sn{  
 bTray=FALSE; ZmT N  
} 4[q'1N6-  
W PDL$y  
void CCaptureDlg::OnChange() ;{@jj0h;  
{ NhP&sQO  
 RegisterHotkey(); %+>t @F,GM  
} Y$tgz)  
oh>X/uj  
BOOL CCaptureDlg::RegisterHotkey() l8O12  
{ Kr;7~`$[  
 UpdateData(); -;VKtBXP</  
 UCHAR mask=0; *qh$,mp>  
 UCHAR key=0; RA5*QW  
 if(m_bControl) C}})dL;(  
  mask|=4;  vbol 70  
 if(m_bAlt) $ U~3$*R  
  mask|=2; Muhq,>!U  
 if(m_bShift) /CXrxeo  
  mask|=1; x+mf QcSD&  
  key=Key_Table[m_Key.GetCurSel()]; ;JNI $DR  
 if(bRegistered){ *jAw  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); ?AL;m.X-@  
  bRegistered=FALSE; "0ITW46n  
 } QvPG 6A]T  
 cMask=mask; hqPpRSv'  
 cKey=key; E`^?2dv+/  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); s :4<wmu4=  
 return bRegistered; i/Nd  
} ^5"2s:vP  
ao@"j}c  
  四、小结 =f4v: j}'|  
%Pz'D6 /  
  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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