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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: <TP=oq?I/  
  IP(Vr7-v  
  一、实现方法 /AW=5Ck-#  
l?Ya"C`FL  
  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: Z /9>  
CO`_^7o9(  
#pragma data_seg("shareddata") 6b:tyQ  
HHOOK hHook =NULL; //钩子句柄 sJDas,7>  
UINT nHookCount =0; //挂接的程序数目 v-PXZ'7~  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 {|'E  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 ZSG9t2qlv  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey 9<>wIl*T`  
static int KeyCount =0; *FMMjz  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 |6$p;Aar  
#pragma data_seg() 0:T|S>FsAm  
#*KNPh  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 &sU?Ok6  
svq<)hAf<  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: TTKs3iTXz  
PF53mUs4  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR =W"F[fD  
cKey,UCHAR cMask) `I3r3WyA  
{ r.BIJt)  
 BOOL bAdded=FALSE;  0}CGuws  
 for(int index=0;index<MAX_KEY;index++){ \Rp-;.I@6  
  if(hCallWnd[index]==0){ *cgI.+  
   hCallWnd[index]=hWnd; 9_ d pR.  
   HotKey[index]=cKey; (,8$V\  
   HotKeyMask[index]=cMask; [Lzw#XE  
   bAdded=TRUE; oomT)gO 6*  
   KeyCount++; 4B^ZnFJ%m  
   break; u4/kR  
  } {o>j6RS\  
 } nYX@J6!  
 return bAdded; o:_Xv.HRZo  
} W`u[h0\c  
//删除热键 fyByz=pl  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P3=W|81e  
{ ,=#F//  
 BOOL bRemoved=FALSE; BYMi6wts  
 for(int index=0;index<MAX_KEY;index++){ o<|P9#(U"  
  if(hCallWnd[index]==hWnd){ }3OKC2K~  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ W;,C_   
    hCallWnd[index]=NULL; 6Q${U7%7  
    HotKey[index]=0; y$_eCmq  
    HotKeyMask[index]=0; "\3B^ e,  
    bRemoved=TRUE; "t~  
    KeyCount--; ;oy-#p>N%  
    break; ])nPPf  
   } Y4v|ko`l%  
  } O R;uqV@  
 } o}* hY"&  
 return bRemoved; 3G(miP6  
} %y@Hh=  
p{j.KI s7  
[m|YWT=  
  DLL中的钩子函数如下: ~4 `5tb  
Np"exFqN k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) j'HZ\_  
{ Bq$rf < W  
 BOOL bProcessed=FALSE; t({W [JL  
 if(HC_ACTION==nCode) D?NbW @]  
 { #6CC3TJ'k  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 /N&CaH\;^$  
   switch(wParam) a+%6B_|\  
   {  /J WGifH  
    case VK_MENU: ybY]e; v*O  
     MaskBits&=~ALTBIT; ZOZ+Y\uU  
     break; eep1I :N  
    case VK_CONTROL: T-U}QM_e  
     MaskBits&=~CTRLBIT; 'LO^<  
     break; :gep:4&u  
    case VK_SHIFT: Vz=PiMO  
     MaskBits&=~SHIFTBIT; -(~!Jo_*'  
     break; "-vW,7y  
    default: //judge the key and send message f PM8f  
     break; *U P@9D  
   } EV*IoE$W]=  
   for(int index=0;index<MAX_KEY;index++){ d%V*|0c)  
    if(hCallWnd[index]==NULL) tF{D= ;G  
     continue; [E/\#4b  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) V;,{}  
    { qLB) XnQ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Ht&:-F+dm  
     bProcessed=TRUE; osX8eX]\  
    } RsY3V=u  
   } gk0(ANx  
  } fmb} 2h  
  else if((lParam&0xc000ffff)==1){ //有键按下 "HDcmIXg&  
   switch(wParam) @tZ&2RY1  
   { @Bf%s(Uj+  
    case VK_MENU: `Ch9~*p  
     MaskBits|=ALTBIT; Q+W1lv8R  
     break; SV~cJ]F  
    case VK_CONTROL: q)^Jj ?W  
     MaskBits|=CTRLBIT; A m>cd;  
     break; Fd[zDz  
    case VK_SHIFT: jhb6T ?}  
     MaskBits|=SHIFTBIT; qa0 yg8,<  
     break; $ >u*} X9  
    default: //judge the key and send message {z")7g ]l  
     break; -bSSP!f  
   } Nw1#M%/!r!  
   for(int index=0;index<MAX_KEY;index++){ 7Z-O_h3;)@  
    if(hCallWnd[index]==NULL) Vv.|br`;}  
     continue; R' !  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) /XzH?n/{R  
    { ,Q HU_jt  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); u (em&M  
     bProcessed=TRUE; &8g?4v  
    } LQngK7>  
   } 8q,6}mV  
  } <c qbUL  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 A*}.EClH  
   for(int index=0;index<MAX_KEY;index++){ Dk(1}%0U/  
    if(hCallWnd[index]==NULL) \kU &^Hi  
     continue; s#)5h0t#du  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) <7j87  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); \v.C]{Gzc  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 4'!c*@Y  
   } ?C&z]f3(:  
  } OslL~<  
 } JU^lyi!  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ]Zyur`  
} dAkgR~  
@jsDq Ln  
  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: (?(zH3  
=Q+= f  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); /7t>TYip!  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ](wvu(y\E  
Ns7(j-  
  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: Q2F+?w;,  
o'f?YZ$.  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) {:]9Q Tq  
{  Pyb Z)5u  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) LRb{hUt=  
 { p%*%n3bw  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 A<qTg`gA  
  SaveBmp(); xK6n0] A  
  return FALSE; I~Zh@d%  
 } w6{TE(]zp  
 …… //其它处理及默认处理 Y[$!`);Ye  
} \8?Tdx=  
a6WI170^1  
/iJ4{p   
  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。 c%'RR?Tl  
RWg No #<  
  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。 JQ6zVS2SSS  
) `A3M)  
  二、编程步骤 :=/>Vbd: )  
T QSzx%i2  
  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"; [ji#U s:h  
b{]z w pf  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; Dm-zMCf}Q  
I/L_@X<*r  
  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; 7w/4QiI  
pnbIiyV  
  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; wT:b\km:!  
t-0a7 1#e  
  5、 添加代码,编译运行程序。 -< &D  
L&%s[  
三、程序代码 !VI]oRgP  
D IzH`|Y  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL b+&% 1C  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) |qmu _x\  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ A#95&kJpy  
#if _MSC_VER > 1000 i*NH'o/  
#pragma once Y[K*57fs  
#endif // _MSC_VER > 1000 8=Z9T<K  
#ifndef __AFXWIN_H__ "vyNxZE  
#error include 'stdafx.h' before including this file for PCH 3T!lA  
#endif ZsOIH<}S  
#include "resource.h" // main symbols @)4]b+8Z  
class CHookApp : public CWinApp .b6VQCS~9  
{ s#tZg  
 public: YtfVD7m  
  CHookApp(); <F=xtyl7  
  // Overrides Gch[Otq]%  
  // ClassWizard generated virtual function overrides lo,$-bJ,<,  
  //{{AFX_VIRTUAL(CHookApp) h_T7% #0  
 public: %]8qAtV^3j  
  virtual BOOL InitInstance(); %+K<<iyR|  
  virtual int ExitInstance(); |>JS!NM I  
  //}}AFX_VIRTUAL Wu_kx2h  
  //{{AFX_MSG(CHookApp) 9)gC6 IiW  
  // NOTE - the ClassWizard will add and remove member functions here. LG1r]2  
  // DO NOT EDIT what you see in these blocks of generated code ! )Hk3A$6(  
  //}}AFX_MSG Hr]h J c  
  DECLARE_MESSAGE_MAP() IuRmEL_Q_  
}; y10h#&k  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ~ y;6W0x  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); 26k LhFS  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); FcYFovS  
BOOL InitHotkey(); L>a  
BOOL UnInit(); V` 1/SQX  
#endif x"{'&J[hx  
2h=!k|6  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. MvWaB  
#include "stdafx.h" x`dHJq`_g  
#include "hook.h" FTQ%JTgT  
#include <windowsx.h> km1~yQ"bH  
#ifdef _DEBUG lAJxr8 .  
#define new DEBUG_NEW -OA?BEQ=I  
#undef THIS_FILE 0#S W!b|%  
static char THIS_FILE[] = __FILE__; K?zH35f$  
#endif )l[M Q4vWW  
#define MAX_KEY 100 ;Mpy#yIU.  
#define CTRLBIT 0x04  $W9{P;  
#define ALTBIT 0x02 $[/&74#0HX  
#define SHIFTBIT 0x01 m$W <  
#pragma data_seg("shareddata") 9=V:&.L  
HHOOK hHook =NULL; HOE_S!N  
UINT nHookCount =0; a8i]]1Blz  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey W034N[9  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT |<.lW  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey +{W>i;U  
static int KeyCount =0; 3rcKzS7  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift X90J!  
#pragma data_seg() r.>].~}4  
HINSTANCE hins; Z<SLc,]^  
void VerifyWindow(); JA'h4AXk  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) %JHGiCv|  
//{{AFX_MSG_MAP(CHookApp) R%qGPO5Z\c  
// NOTE - the ClassWizard will add and remove mapping macros here. d\61; C  
// DO NOT EDIT what you see in these blocks of generated code! },>pDeX^P  
//}}AFX_MSG_MAP Qkd<sxL  
END_MESSAGE_MAP() qLT>Mz)$ %  
3`ELKq  
CHookApp::CHookApp() v {jQek4  
{ bV$)!]V  
 // TODO: add construction code here, G1"zElug  
 // Place all significant initialization in InitInstance 0DmMG  
} (h5'9r  
G_k~X"  
CHookApp theApp; W81E!RyP`  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) OZTPOz.  
{ l#H#+*F  
 BOOL bProcessed=FALSE; ]) rrG/3  
 if(HC_ACTION==nCode) 'iGzkf}j  
 { $;/}?QY(  
  if((lParam&0xc0000000)==0xc0000000){// Key up *IY*yR6  
   switch(wParam) *WIj4G.d  
   { sZL#xZ5 Df  
    case VK_MENU: fD07VBS yl  
     MaskBits&=~ALTBIT; ?F6pEt4  
     break; _',prZ*  
    case VK_CONTROL: ,Td!|~I|j6  
     MaskBits&=~CTRLBIT; V {pj~D.E  
     break; lI-L` x  
    case VK_SHIFT: o_D?t-XH  
     MaskBits&=~SHIFTBIT; -R%<.]fJ  
     break; 7A\~)U @  
    default: //judge the key and send message #L{OV)a<  
     break; @1 U&UH  
   } GA?87N  
   for(int index=0;index<MAX_KEY;index++){ H*Kj3NgY  
    if(hCallWnd[index]==NULL) e=Z, Jg  
     continue; Sz^5b!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ;z IP,PMM  
    { spGB)k,^  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); |/2y-[;:  
     bProcessed=TRUE; yI ld75S`  
    } eXK o.JL  
   } B|4X}*@SX  
  } )~+e`q  
  else if((lParam&0xc000ffff)==1){ //Key down tvu!< dxZ  
   switch(wParam) E7CH^]x  
   { Wo7F  
    case VK_MENU: >OG:vw)E  
     MaskBits|=ALTBIT; phn9:{TI  
     break; &s$(g~ 4gC  
    case VK_CONTROL: .GsO.#p{  
     MaskBits|=CTRLBIT; ;B?DfWX  
     break; \L(*]:EP  
    case VK_SHIFT: #DN0T' B  
     MaskBits|=SHIFTBIT; 5o6>T!  
     break; <HJl2p N  
    default: //judge the key and send message "=+ 7-`  
     break; gx&Tt  
   } #%D_Y33;  
   for(int index=0;index<MAX_KEY;index++) t: IN,Kl4  
   { FRS>KO=3  
    if(hCallWnd[index]==NULL) {2+L @  
     continue; Mnz!nWhk  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) #ssN027  
    { g q}I[N  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 2A\,-*pc  
     bProcessed=TRUE; W ]Nv33i [  
    } Ci<ATho  
   } }yJ$SR]t  
  } e89Xb;;w  
  if(!bProcessed){ ]]&M@FM2z  
   for(int index=0;index<MAX_KEY;index++){ ~-dV^SO  
    if(hCallWnd[index]==NULL) &3$z4df  
     continue; >zhO7,=,  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) }t ;(VynV)  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Ojt`^r!V  
   }  wAz&"rS  
  } *0|IXGr  
 } L}FO jrN  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); .{=$!8|&I9  
} e+j)~RBnu3  
Vg>(  Y,  
BOOL InitHotkey() U R%4@   
{ i-'9AYyw  
 if(hHook!=NULL){ '2laTl]`  
  nHookCount++; GN0`rEh  
  return TRUE; A5H3%o(6k  
 } EM/@T}  
 else Cz W:L&t  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); 9{$<0,?  
  if(hHook!=NULL) rS?pWTg"8  
   nHookCount++; zt<WXw(  
  return (hHook!=NULL); Qhw^S*  
} %<\6TZr  
BOOL UnInit() !Yw3 d   
{ l6~-8d+lfN  
 if(nHookCount>1){ b L]erYm  
  nHookCount--; 1 I*7SkgKv  
  return TRUE; z9p05NFH  
 } `KCh*i  
 BOOL unhooked = UnhookWindowsHookEx(hHook); Da v PYg  
 if(unhooked==TRUE){ :T._ba3|  
  nHookCount=0; v\,N5  
  hHook=NULL; %rF?dvb;?  
 } {XW Z<OjG  
 return unhooked; k~/>b~ .c  
} =r.mlc``W  
}->.k/vc  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) <N`J`J-[  
{ #_|sgS?1  
 BOOL bAdded=FALSE; zOSs[[  
 for(int index=0;index<MAX_KEY;index++){ rC7``#5  
  if(hCallWnd[index]==0){ 2<][%> '  
   hCallWnd[index]=hWnd; F! X}(N?t  
   HotKey[index]=cKey; +E;2d-x*p  
   HotKeyMask[index]=cMask; fsEzpUY:{W  
   bAdded=TRUE; h@@nR(<i  
   KeyCount++; eXkujjSw"  
   break; (__yh^h:m  
  } 7;tJK^J`  
 } c(/VYMJZ&  
 return bAdded; I0'[!kBF|  
} T /mI[*1xI  
[Cb` {  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) NziZTU}  
{ $Y9jrR'w  
 BOOL bRemoved=FALSE; /\w)>0  
 for(int index=0;index<MAX_KEY;index++){ 'Vr$MaO  
  if(hCallWnd[index]==hWnd){ o d7]tOK9  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ xESjM1A)  
    hCallWnd[index]=NULL; _6k*'aT~FK  
    HotKey[index]=0; $%%os6y2v  
    HotKeyMask[index]=0; +e-,ST&w(  
    bRemoved=TRUE; e|rg;`AW  
    KeyCount--; WH$e2[+Y  
    break; AWjm~D-?  
   } oM)h#8bq  
  } w]_zp?\^ }  
 } [<,~3oRu  
 return bRemoved; "GQl~  
} 3-%Cw2ds  
P1U*g!  
void VerifyWindow() Pe_!?:vF  
{ HJC(\\~  
 for(int i=0;i<MAX_KEY;i++){ i,nm`Z>u  
  if(hCallWnd!=NULL){ 9~0^PzTA  
   if(!IsWindow(hCallWnd)){ ;ml 3  
    hCallWnd=NULL; #$1og=  
    HotKey=0; kip`Myw+  
    HotKeyMask=0; {i*2R^5  
    KeyCount--; KZbR3mi,  
   } 3loY qeP  
  } ?,=f\Fz!  
 } 68iV/ 7  
} ]O` {dnP  
{&[9iIf  
BOOL CHookApp::InitInstance() j.i#*tN//  
{ LrCk*@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); '&FjW-`" G  
 hins=AfxGetInstanceHandle(); 7Mx6  
 InitHotkey(); +"ueq  
 return CWinApp::InitInstance(); cM&2SRBZ  
} M('d-Q{B7L  
`Ci4YDaz;k  
int CHookApp::ExitInstance() #n  
{ =l9T7az  
 VerifyWindow(); >m'x8xB=  
 UnInit(); k{AyD`'Q  
 return CWinApp::ExitInstance(); mF09U(ci  
} a{!r`>I\f  
3S BZ>  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file o:Zd1"Z  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) d vOJW".  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ i1oKrRv  
#if _MSC_VER > 1000 M0c 9pE  
#pragma once o+?r I p  
#endif // _MSC_VER > 1000 f&hwi:t  
+<.\5+  
class CCaptureDlg : public CDialog -#29xRPk  
{ w# * 1/N  
 // Construction %@R~DBS  
 public: e#/kNHl  
  BOOL bTray; *8ExRQZ$  
  BOOL bRegistered; `*\{.;,]#  
  BOOL RegisterHotkey(); .9|u QEL  
  UCHAR cKey; 3_`szl-  
  UCHAR cMask; l12$l<x&M  
  void DeleteIcon(); (X6sSO  
  void AddIcon(); ~JuKV&&}K  
  UINT nCount; S)A'Y]2X  
  void SaveBmp(); H<ZU#U0FZf  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor Sg] J7;]  
  // Dialog Data S='syq>Aok  
  //{{AFX_DATA(CCaptureDlg) O{k:yVb  
  enum { IDD = IDD_CAPTURE_DIALOG }; "%@uO)A /  
  CComboBox m_Key; plV7+?G  
  BOOL m_bControl; \;]kYO}  
  BOOL m_bAlt; 15zrrU~D  
  BOOL m_bShift; y_}SK6{  
  CString m_Path; uD[ "{?H  
  CString m_Number; *o' 4,+=am  
  //}}AFX_DATA ecX/K.8l  
  // ClassWizard generated virtual function overrides !]S=z^"<  
  //{{AFX_VIRTUAL(CCaptureDlg) ^+R:MBK  
 public: l #@&~f[  
  virtual BOOL PreTranslateMessage(MSG* pMsg); p8,0lo  
 protected: n+D#k 8{  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qUf)j\7"Fn  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); =f:(r'm?r.  
  //}}AFX_VIRTUAL ACV ek  
  // Implementation ~]8p_;\  
 protected: YCw('i(|  
  HICON m_hIcon; sg'NBAo"  
  // Generated message map functions 6U,fz#<,}  
  //{{AFX_MSG(CCaptureDlg) d `j?7Z  
  virtual BOOL OnInitDialog(); {5Eyr$  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); c-5jYwV  
  afx_msg void OnPaint(); E/za @W  
  afx_msg HCURSOR OnQueryDragIcon(); 1]\TI7/ n  
  virtual void OnCancel(); b0a}ME&1  
  afx_msg void OnAbout(); L8V3BH7B  
  afx_msg void OnBrowse(); C%ytkzG_  
  afx_msg void OnChange(); 5@XV6  
 //}}AFX_MSG S;A)C`X&  
 DECLARE_MESSAGE_MAP() mjEs5XCC"  
}; PMKb ]y  
#endif o6?l/nJ  
2[dIOb4b  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file g]`bnZ7  
#include "stdafx.h" $`vkw(;t)1  
#include "Capture.h" /qxJgoa  
#include "CaptureDlg.h" ,.g}W~S)  
#include <windowsx.h> o&^NwgRCF  
#pragma comment(lib,"hook.lib") cD{8|B*  
#ifdef _DEBUG [xpQH?  
#define new DEBUG_NEW H_X?dj15  
#undef THIS_FILE C=VIT*=  
static char THIS_FILE[] = __FILE__; 00M`%c/  
#endif p\U*;'hv  
#define IDM_SHELL WM_USER+1 DMkhbo&+  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ?En7_X{C?  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); F@hYA  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; z/1hqxHl  
class CAboutDlg : public CDialog /#yA%0=w  
{ DzPs!(5[I  
 public: A/Khk2-:  
  CAboutDlg(); wO"GtVd  
  // Dialog Data i<u9:W  
  //{{AFX_DATA(CAboutDlg) y3yvZD  
  enum { IDD = IDD_ABOUTBOX }; G[q9A$yw  
  //}}AFX_DATA i=8UBryr'e  
  // ClassWizard generated virtual function overrides -3mgza  
  //{{AFX_VIRTUAL(CAboutDlg) rR!U;  
 protected: r]t )x*  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support +p?hGoF=  
  //}}AFX_VIRTUAL 'XTs -=  
  // Implementation KzkgWMM  
 protected: g2'x#%ET  
  //{{AFX_MSG(CAboutDlg) e~Hr(O+;e6  
  //}}AFX_MSG <F=Dj*]  
  DECLARE_MESSAGE_MAP() Lp~^*j(  
}; b~W)S/wF$P  
8^w/HCC8O  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) \|Qb[{<:,  
{ Z( #Ln  
 //{{AFX_DATA_INIT(CAboutDlg) |mj# 0  
 //}}AFX_DATA_INIT +t>XxYScx  
} T _~KxQ  
M5Wl3tZL  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) =hcPTU-QU  
{ CT}' ")Bm  
 CDialog::DoDataExchange(pDX); u)7 ]1e{  
 //{{AFX_DATA_MAP(CAboutDlg) J v<$*TVS0  
 //}}AFX_DATA_MAP Ofm5[q=  
} ]xR4->eix  
g9qC{x d  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) _j 5N=I{U  
 //{{AFX_MSG_MAP(CAboutDlg) > tEK+Y|N}  
 // No message handlers G{A)H_o*  
 //}}AFX_MSG_MAP gUGOHd(A  
END_MESSAGE_MAP() u&SZ lkf6%  
k2OM="Ei}  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) y#bK,}  
: CDialog(CCaptureDlg::IDD, pParent) MOyT< $  
{ kZK//YN#  
 //{{AFX_DATA_INIT(CCaptureDlg) [` 'd#pR  
  m_bControl = FALSE; ]-KV0H  
  m_bAlt = FALSE; s$3`X(Pn  
  m_bShift = FALSE; BVAr&cu  
  m_Path = _T("c:\\"); RH=$h! 5  
  m_Number = _T("0 picture captured."); O3+)qb!X  
  nCount=0; L *{QjH  
  bRegistered=FALSE; b8cVnP  
  bTray=FALSE; ( H[  
 //}}AFX_DATA_INIT Q)+Y}  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \[k% )_  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); l% |cB93  
} C.HYS S  
k<,u0  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) &GU@8  
{ IM$0#2\  
 CDialog::DoDataExchange(pDX); j=Q$K #sBt  
 //{{AFX_DATA_MAP(CCaptureDlg) od(:Y(4  
  DDX_Control(pDX, IDC_KEY, m_Key); aG Ef#A  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); 3d@ef |  
  DDX_Check(pDX, IDC_ALT, m_bAlt); hA5,w_G/  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); NGj"ByVjx  
  DDX_Text(pDX, IDC_PATH, m_Path); [Gf{f\O  
  DDX_Text(pDX, IDC_NUMBER, m_Number); fwH`}<o  
 //}}AFX_DATA_MAP ?k::tNv0  
} e2Ww0IK!E  
w~{| S7/  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) >3+FZ@.iT  
//{{AFX_MSG_MAP(CCaptureDlg) V*~423  
 ON_WM_SYSCOMMAND() X/wmKi  
 ON_WM_PAINT() C{)HlOW  
 ON_WM_QUERYDRAGICON() = uk`pj  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) lY->ucS %P  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 1XGG.+D  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 3!bK d2"  
//}}AFX_MSG_MAP u&tFb]1@)  
END_MESSAGE_MAP() `11#J;[@G  
wH#-mu#Yl<  
BOOL CCaptureDlg::OnInitDialog() Tr$i= M  
{ e^Aa!  
 CDialog::OnInitDialog(); jPpRsw>  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); eB7>t@ED  
 ASSERT(IDM_ABOUTBOX < 0xF000); & L3UlL  
 CMenu* pSysMenu = GetSystemMenu(FALSE); t5n2eOy~T  
 if (pSysMenu != NULL) qf)C%3gXI  
 { U81;7L8  
  CString strAboutMenu; fZ{&dslg  
  strAboutMenu.LoadString(IDS_ABOUTBOX); <g*.p@o  
  if (!strAboutMenu.IsEmpty()) 6I5o2i  
  { OFIMi^@  
   pSysMenu->AppendMenu(MF_SEPARATOR); %Dra7B%  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); n3*UgNg%fK  
  } ;n` $+g:>  
 } pY, O_ t$  
 SetIcon(m_hIcon, TRUE); // Set big icon ?-d Ain1w  
 SetIcon(m_hIcon, FALSE); // Set small icon Kc-Y  
 m_Key.SetCurSel(0); {:3.27jQ  
 RegisterHotkey(); l3BD <PB2S  
 CMenu* pMenu=GetSystemMenu(FALSE); 2DUr7r M  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND);  XL&hs+Y  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 5pB^Y MP  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Vj/fAHR`>'  
 return TRUE; // return TRUE unless you set the focus to a control ^W5>i[  
} 'xsbm^n6a&  
:cEd[Jm9  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) G{/;AK  
{ pK<%<dIc  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) ,;7`{Nab  
 { E3LBPXK  
  CAboutDlg dlgAbout; r7RU"H:j8  
  dlgAbout.DoModal(); b#Jo Xa9  
 } Ew>~a8! Fq  
 else HRj7n<>L=  
 { WBy[m ?d  
  CDialog::OnSysCommand(nID, lParam); <8g=BWA  
 } !8we8)7  
} L#`7FaM?  
>kt~vJI  
void CCaptureDlg::OnPaint() {ip=iiW2  
{ >6XDX=JVI  
 if (IsIconic()) c%jsu"  
 { bd} r#^'K  
  CPaintDC dc(this); // device context for painting y-%nJD$  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); k?o^5@b/  
  // Center icon in client rectangle &|s+KP|d  
  int cxIcon = GetSystemMetrics(SM_CXICON); &K+  
  int cyIcon = GetSystemMetrics(SM_CYICON); ^@M [t<  
  CRect rect; O<4Q$|=&?  
  GetClientRect(&rect); 2wGF-V  
  int x = (rect.Width() - cxIcon + 1) / 2; p "/(>8  
  int y = (rect.Height() - cyIcon + 1) / 2; tF<^9stM  
  // Draw the icon #"hJpyW 4V  
  dc.DrawIcon(x, y, m_hIcon); 7[4_+Q:}  
 } LjSLg[i  
 else )\0Ug7]?  
 { ^WmGo]<B_  
  CDialog::OnPaint(); \5t`p67Ve_  
 } ESn6D@"  
} p(~Y" H  
D~5yj&&T;  
HCURSOR CCaptureDlg::OnQueryDragIcon() ? 7/W>  
{ '`9%'f)  
 return (HCURSOR) m_hIcon; 3%_ 4+zd  
} U)u\1AV5  
a#YuKh?  
void CCaptureDlg::OnCancel() ;I[ht  
{ :!(YEF#}  
 if(bTray) dVPq%[J2  
  DeleteIcon(); >g>f;\mD7$  
  CDialog::OnCancel(); 2T//%ys=  
}  AQB1gzE  
?@3#c  
void CCaptureDlg::OnAbout() /&*m1EN#o  
{ v&p,Clt-2  
 CAboutDlg dlg; gCg4;b6g  
 dlg.DoModal(); D/gd  
} kuWK/6l4  
IRlN++I!  
void CCaptureDlg::OnBrowse() 6e-#XCR{  
{ BPwI8\V  
 CString str; f<g>dQlE  
 BROWSEINFO bi; JX2mTQ  
 char name[MAX_PATH]; 17WNJ  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ;3 G~["DA  
 bi.hwndOwner=GetSafeHwnd(); $?[1#%  
 bi.pszDisplayName=name; _=o1?R  
 bi.lpszTitle="Select folder"; "L9C  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; N|UBaPS|o  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0q:(-z\S4  
 if(idl==NULL) t9?R/:B%  
  return; nu#aa#ex>  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); <P+G7!KZ&  
 str.ReleaseBuffer(); 0\? _ lT2  
 m_Path=str; Aqa6R+c  
 if(str.GetAt(str.GetLength()-1)!='\\') 'q{PtYr  
  m_Path+="\\"; >(IITt  
 UpdateData(FALSE); }%-UL{3%  
} ]cx"  
/d{glOk  
void CCaptureDlg::SaveBmp() QN)/,=#  
{ 8W19#?7>B  
 CDC dc; 9=Y,["br$_  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); "}S9`-Wd|  
 CBitmap bm; [54@irH  
 int Width=GetSystemMetrics(SM_CXSCREEN); [>b  '}4  
 int Height=GetSystemMetrics(SM_CYSCREEN); 2q`)GCES~  
 bm.CreateCompatibleBitmap(&dc,Width,Height); +CsI,Uf4*  
 CDC tdc; >v^2^$^u  
 tdc.CreateCompatibleDC(&dc); Am>_4  
 CBitmap*pOld=tdc.SelectObject(&bm); s$f+/Hs  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 4y|xUO:  
 tdc.SelectObject(pOld); cEDDO&u  
 BITMAP btm; P]!LN\[  
 bm.GetBitmap(&btm); ~bQFk?ZN+  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; skk-.9  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);  6'RZ  
 BITMAPINFOHEADER bih; X)`(nj  
 bih.biBitCount=btm.bmBitsPixel; xDPQG`6  
 bih.biClrImportant=0; wm); aWP  
 bih.biClrUsed=0; s,eld@  
 bih.biCompression=0; >/7KL2*  
 bih.biHeight=btm.bmHeight; 2uvQf&,  
 bih.biPlanes=1; s(1_:  
 bih.biSize=sizeof(BITMAPINFOHEADER); }ZEfT]  
 bih.biSizeImage=size; }u(d'9u  
 bih.biWidth=btm.bmWidth; PWf{aHsr  
 bih.biXPelsPerMeter=0; 2x)0?N[$O  
 bih.biYPelsPerMeter=0; ,H.(\p_N  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); PY^^^01P  
 static int filecount=0; 8C*6Fjb#  
 CString name; Ft3N#!ubl  
 name.Format("pict%04d.bmp",filecount++); Ck ~V5  
 name=m_Path+name; t] n(5!L(  
 BITMAPFILEHEADER bfh; Y0/jH2n  
 bfh.bfReserved1=bfh.bfReserved2=0; '_q: vjX  
 bfh.bfType=((WORD)('M'<< 8)|'B'); _Vdb?  
 bfh.bfSize=54+size; @D.R0uM  
 bfh.bfOffBits=54; '+ o:,6  
 CFile bf; y)?W-5zL  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ N&0uXrw  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); zCKy`u .  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); |1dEs,z\  
  bf.WriteHuge(lpData,size); g5kYyE  
  bf.Close(); OmTZ-*N  
  nCount++; 2+T8Y,g  
 } n:5O9,umZ  
 GlobalFreePtr(lpData); ?=;e.qK=71  
 if(nCount==1) es.\e.HK  
  m_Number.Format("%d picture captured.",nCount); ,cGwtt(  
 else Gt\K Ln  
  m_Number.Format("%d pictures captured.",nCount); /RA1d<~$q  
  UpdateData(FALSE); jSeA %Te  
} $I}Hk^X  
xJ[k#?T'  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) Sb:zN'U  
{ {V]Qwz)1  
 if(pMsg -> message == WM_KEYDOWN) /%J&/2Wz  
 { < "L){$  
  if(pMsg -> wParam == VK_ESCAPE) ?)Czl4J  
   return TRUE; BNL8hK`D  
  if(pMsg -> wParam == VK_RETURN) L}e"nzTE6I  
   return TRUE; <B ]i80.  
 } Dyouk+08x  
 return CDialog::PreTranslateMessage(pMsg); +E q~X=x  
} / K_e;(Y_  
lRF_ k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 48 c D3w  
{ H y.3ccZ0  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ %468s7Q[Mi  
  SaveBmp(); #lBpln9  
  return FALSE; t_dw}I   
} ?l\gh1{C  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s0XRL1kWr  
 CMenu pop; .T#y N\S1  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); #q~3c;ec  
 CMenu*pMenu=pop.GetSubMenu(0); *!r\GGb  
 pMenu->SetDefaultItem(ID_EXITICON); e6{[o@aM{  
 CPoint pt; \J,- <wF  
 GetCursorPos(&pt); xY\*L:TwW  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); h9Tf@]W   
 if(id==ID_EXITICON) Y2=Brtc[@  
  DeleteIcon(); NgE&KPj\  
 else if(id==ID_EXIT) F(KH-  
  OnCancel(); SCfkv|hO  
 return FALSE; DuO%B  
} S1H47<)UF  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); zulf%aaL  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) fcE/  
 AddIcon(); G)tq/`zNw  
 return res; g9([3pV,  
} sl^s9kx;C$  
%|D\j-~  
void CCaptureDlg::AddIcon() ;G4HMtL  
{ L!8 -:)0b  
 NOTIFYICONDATA data; DmXDg7y7s  
 data.cbSize=sizeof(NOTIFYICONDATA); @Q$ /eL  
 CString tip; r3c\;Ra7  
 tip.LoadString(IDS_ICONTIP); MuFU?3ovG*  
 data.hIcon=GetIcon(0); Ew?/@KAV\  
 data.hWnd=GetSafeHwnd(); Z5*(W;;  
 strcpy(data.szTip,tip); }GoOE=rhY  
 data.uCallbackMessage=IDM_SHELL; P[#WHbn  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; qOcG|UgF  
 data.uID=98; 86^ZYh  
 Shell_NotifyIcon(NIM_ADD,&data); ]df9'\  
 ShowWindow(SW_HIDE); j?f,~Y<k  
 bTray=TRUE; g6@NPQ  
} ~/|unV  
+]S;U&vQ  
void CCaptureDlg::DeleteIcon() H4y1Hpa,  
{ So)KI_M  
 NOTIFYICONDATA data; o%4&1^ Vg  
 data.cbSize=sizeof(NOTIFYICONDATA); m mJ)m  
 data.hWnd=GetSafeHwnd(); S0Bl?XsD_  
 data.uID=98; _ntW}})K  
 Shell_NotifyIcon(NIM_DELETE,&data); < ;%q  
 ShowWindow(SW_SHOW); !0. 5  
 SetForegroundWindow(); pzt Zb  
 ShowWindow(SW_SHOWNORMAL); px [1#*  
 bTray=FALSE; 5QL9 w3L  
} -aH?7HV}  
YzhN|!;!k  
void CCaptureDlg::OnChange() @KW+?maW  
{ _~w V{ yp  
 RegisterHotkey(); QN}3S0  
} l9ifUh e  
D25gg  
BOOL CCaptureDlg::RegisterHotkey() {o5K?Pb  
{ 9A} kkMB:  
 UpdateData(); . ~A"Wyu\  
 UCHAR mask=0; RZV1:hNN  
 UCHAR key=0; k9_VhR|!  
 if(m_bControl) ;GSFQ:m[  
  mask|=4; ek{PA!9Sk  
 if(m_bAlt) 2,XqslB)  
  mask|=2; ]:E! i^C`Z  
 if(m_bShift) Xg!|F[i  
  mask|=1; $ vw}p.  
  key=Key_Table[m_Key.GetCurSel()]; P2 K>|r  
 if(bRegistered){ -YRL>]1  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Y%CL@G60  
  bRegistered=FALSE; 5>1Y="B  
 } /H;kYx  
 cMask=mask; P7>C4rmQ  
 cKey=key; .z-^Ga*  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); y`B!6p 5j  
 return bRegistered; VI|DM x   
} $p6Xa;j$9  
2p3u6\y  
  四、小结 q| =q:4_L  
uDE91.pUkr  
  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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