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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: lMBX!9z  
  N&fW9s}  
  一、实现方法 sK@Y!oF}\  
4L=$K2R2r  
  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: & =73D1A  
9jO`gWxV8*  
#pragma data_seg("shareddata") cX %:  
HHOOK hHook =NULL; //钩子句柄 5=Kq@[(4  
UINT nHookCount =0; //挂接的程序数目 @sw9A93A  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 qGnPnQc  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 VY/|WD~"CW  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey ,< @,gZru  
static int KeyCount =0; J?UA:u  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 D:wnO|:  
#pragma data_seg() , Aq9fyC%  
Hp btj  
  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。 l`@0zw+  
PXw| L  
  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: dqqnCXYuW  
!1a}| !Zn  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR Hf VHI1f  
cKey,UCHAR cMask) izMYVI?0  
{ :KEq<fEI  
 BOOL bAdded=FALSE; "\}b!gl$8  
 for(int index=0;index<MAX_KEY;index++){ ~?#~Ar  
  if(hCallWnd[index]==0){ `-VG ?J  
   hCallWnd[index]=hWnd; ;\N79)Gk  
   HotKey[index]=cKey; B@ -|b  
   HotKeyMask[index]=cMask; jcE Msc  
   bAdded=TRUE; = 0 ,|/1~  
   KeyCount++; 8tU>DJ}0  
   break; YWEYHr;%^?  
  } PPEq6}  
 } 6DB0ni  
 return bAdded; k@S)j<  
} vX ?aB!nkw  
//删除热键 4S tjj!ew  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) H"eS<eT  
{ Uo~T'mA"  
 BOOL bRemoved=FALSE; u t$c)_  
 for(int index=0;index<MAX_KEY;index++){ tZbFvk2  
  if(hCallWnd[index]==hWnd){ ML=eL*}l  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ I!P4(3skAB  
    hCallWnd[index]=NULL; JnY$fs*"  
    HotKey[index]=0; rvwa!YY}  
    HotKeyMask[index]=0; O$^xkv5.  
    bRemoved=TRUE; 09'oz*v{#  
    KeyCount--; C0QM#"[  
    break; &:<, c12  
   } z`4c 4h]I  
  } b]T@gJ4H=  
 } ow/U   
 return bRemoved; L_~8"I_  
} b?8)7.{F{  
h$`#YNd'  
"oR@JbdX  
  DLL中的钩子函数如下: rh66_eV  
&dr@6-xaq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) s3:9$.tiR[  
{ /`3 #4=5-  
 BOOL bProcessed=FALSE; ]n;1x1'  
 if(HC_ACTION==nCode) XRxj  W  
 { .XS9,/S  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 -R b{^/  
   switch(wParam) o:~LF6A-  
   {  #$E)b:xj  
    case VK_MENU: 1& ^?U{  
     MaskBits&=~ALTBIT; l$XPIC~H  
     break; mV)+qXC  
    case VK_CONTROL: r^1+cwy/7P  
     MaskBits&=~CTRLBIT; ;wHCj$q  
     break; ) #+^ sAO  
    case VK_SHIFT: M'L;N!1A  
     MaskBits&=~SHIFTBIT; n}?wVfEy  
     break; R[jEvyD>(  
    default: //judge the key and send message ^5; `-Ky  
     break; Ef)yQ  
   } U*)m' ,  
   for(int index=0;index<MAX_KEY;index++){ F_H82BE+3  
    if(hCallWnd[index]==NULL) e<cM[6H'D  
     continue; 5Qh?>n>*  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) \ck+GW4&  
    { AUe# RP  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); n, i'Dhzk  
     bProcessed=TRUE; <RNJ>>0  
    } om h{0jA0  
   } ZJ*g)) k7  
  } 9DQa PA6  
  else if((lParam&0xc000ffff)==1){ //有键按下 O1'm@ q)  
   switch(wParam) x1&W^~  
   { tptN6Isuh  
    case VK_MENU: NMOut@  
     MaskBits|=ALTBIT; Xx:F)A8O  
     break; ~@.%m"<.  
    case VK_CONTROL: 0tg8~H3yy  
     MaskBits|=CTRLBIT; %ru;;h  
     break; R:Q0=PzDi#  
    case VK_SHIFT: Xce0~\_ A  
     MaskBits|=SHIFTBIT; #n0Y6Pr  
     break; 1K,1X(0rL8  
    default: //judge the key and send message fjk\L\1  
     break; r$Co0!.  
   } 2_vbT!_  
   for(int index=0;index<MAX_KEY;index++){ )WT>@  
    if(hCallWnd[index]==NULL) Tou/5?# %e  
     continue; ]I3!fEAWR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) m<FOu<y  
    { <\kr1qH H  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); EBz}|GY;  
     bProcessed=TRUE; Z87_#5  
    } M@0;B30L  
   } q[`j`8YY!R  
  } oy<WsbnS  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ,|&9M^  
   for(int index=0;index<MAX_KEY;index++){ 2^i(gaXUQ  
    if(hCallWnd[index]==NULL) Reatd h  
     continue; Na X   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) -B86U6^s  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); mZd , 9  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 (}}S9 K  
   } {e|[%reSkg  
  } E Cyyl  
 } dAy?EO0\7  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); O)vp~@ |  
} -[-wkC8a  
l ok=  
  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: nqLA}u4IM  
j_Yp>=+[  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qgfi\/$6  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 1dK*y'rx  
T?X_c"{8M  
  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: K.0:C`C  
E~6c-Lw  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) <_7*67{  
{ r(P(Rj2~  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) H- $)3"K  
 { *6VF $/rP  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 @H=:)* ;  
  SaveBmp(); /{&tY: ;m  
  return FALSE; 9g mW&{6q  
 } }"|K(hq  
 …… //其它处理及默认处理 .nVa[B |.  
} yPal<c  
xU4 +|d  
NGbG4-w-  
  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。 $ 69oV:  
WHj'dodS  
  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。 Hhcpp7cr'  
MB~=f[cUnd  
  二、编程步骤 eLfk\kk]Pc  
I+tb[*X+  
  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"; c"B{/;A  
AHXSt  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; f}9zgWU  
`ojoOB^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; {?:X8&Sf  
sTn<#l6  
  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; vH :LQ!2  
JzQ)jdvp  
  5、 添加代码,编译运行程序。 *%%g{ 3$  
z=q3Zo  
三、程序代码 ]&lY%"U$i  
v|dBSX9k0  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL X\{LnZ@r4  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) jIC_[  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ "@iK' c^  
#if _MSC_VER > 1000 `4=^cyt+  
#pragma once *Q ?tl\E  
#endif // _MSC_VER > 1000 '>-gi}z7  
#ifndef __AFXWIN_H__ l]Ax:Z  
#error include 'stdafx.h' before including this file for PCH f4 P8Oz  
#endif p@xf^[50k  
#include "resource.h" // main symbols &"&Z #llb  
class CHookApp : public CWinApp  zv0l,-o  
{ k_ & :24Lj  
 public: D$ dfNiCH  
  CHookApp(); WrQDX3  
  // Overrides IzikDc10  
  // ClassWizard generated virtual function overrides z> Rsi  
  //{{AFX_VIRTUAL(CHookApp) 7puFz4+f  
 public: oHd FMD@  
  virtual BOOL InitInstance(); 8 OY3A  
  virtual int ExitInstance(); ZSjMH .Ij"  
  //}}AFX_VIRTUAL %b&". mN  
  //{{AFX_MSG(CHookApp) ^1iSn)&  
  // NOTE - the ClassWizard will add and remove member functions here. :W!7mna  
  // DO NOT EDIT what you see in these blocks of generated code ! b6nsg|&#  
  //}}AFX_MSG @XLy7_}  
  DECLARE_MESSAGE_MAP() 5D\f8L  
}; >7lx=T x  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); }zkHJxZgE  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); XewVcRo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); TSTl+W  
BOOL InitHotkey(); `Nz/O h7  
BOOL UnInit(); ")O%86_Q:  
#endif G_;)a]v8)  
5]KW^sL  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. LLk(l#K*  
#include "stdafx.h" h1B? 8pD  
#include "hook.h" u$DHVRrF<  
#include <windowsx.h> z.7cy@N6  
#ifdef _DEBUG \Jx04[=  
#define new DEBUG_NEW R<\F:9  
#undef THIS_FILE JlH&??  
static char THIS_FILE[] = __FILE__; 15%w 8u  
#endif Bc+w+  
#define MAX_KEY 100 /(u}KMR!f  
#define CTRLBIT 0x04 .z]Wyx&/U  
#define ALTBIT 0x02 >6NRi/[  
#define SHIFTBIT 0x01 }#L^!\V }  
#pragma data_seg("shareddata") pf1BN@ t  
HHOOK hHook =NULL; Z>QF#."m  
UINT nHookCount =0; f%SZg!+t  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey 0"kbrv2y  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT }Ga\wV  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey G9Y#kBr  
static int KeyCount =0; 6g 5#TpCh  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift DnC{YK  
#pragma data_seg() NG--6\  
HINSTANCE hins; p2ogn}`  
void VerifyWindow(); P^ A!.}d  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) C>-aIz!y  
//{{AFX_MSG_MAP(CHookApp) c9HrMgW  
// NOTE - the ClassWizard will add and remove mapping macros here. a6D &/8  
// DO NOT EDIT what you see in these blocks of generated code! + fC=UAZ  
//}}AFX_MSG_MAP +1uF !G&l  
END_MESSAGE_MAP() y+X2Pl  
/JFUU[W  
CHookApp::CHookApp() :Pvzl1  
{ |uX,5Q#6  
 // TODO: add construction code here, NL!u<6y  
 // Place all significant initialization in InitInstance 9f2UgNqe9  
} :# .<[  
:e_V7t)o  
CHookApp theApp; 5k`l $mW{  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) !qv ea,vw  
{ 01}C^iD  
 BOOL bProcessed=FALSE; OHeT,@(mh  
 if(HC_ACTION==nCode) )we}6sE"  
 { v K9E   
  if((lParam&0xc0000000)==0xc0000000){// Key up PMN jn9d  
   switch(wParam) <}E!w_yi  
   { H7d/X  
    case VK_MENU: e7m*rh%5>  
     MaskBits&=~ALTBIT; *QwY]j%^  
     break; <g1hxfKx5  
    case VK_CONTROL: `V`lo,"\  
     MaskBits&=~CTRLBIT; ()5[x.xK@  
     break; )+[ gd/<C.  
    case VK_SHIFT: =h0,?]z  
     MaskBits&=~SHIFTBIT; )Qe~ 8u@?  
     break; VKq=7^W  
    default: //judge the key and send message N>XS=2tzN  
     break; _CmOd-y  
   } fQi4\m  
   for(int index=0;index<MAX_KEY;index++){ {[+mpKq  
    if(hCallWnd[index]==NULL) Kla'lCZ  
     continue; w2 a1mU/  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) EB2w0a5  
    { tn Pv70m  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); umiBj)r  
     bProcessed=TRUE; CDP U\ZG  
    } VFRi1\G  
   } sE:M@`2L  
  } t5y;CxL  
  else if((lParam&0xc000ffff)==1){ //Key down [R=yF ~-  
   switch(wParam) GT0Of~?f  
   { ~/98Id}v  
    case VK_MENU: nm6h%}xND<  
     MaskBits|=ALTBIT; v^#~98g]  
     break; kQEy#JQmB  
    case VK_CONTROL: BW 4%l  
     MaskBits|=CTRLBIT; .^h#_[dp  
     break; ] lrWgm  
    case VK_SHIFT: L*&p !  
     MaskBits|=SHIFTBIT; ]Q>.HH  
     break; !bN*\c  
    default: //judge the key and send message 2E}*v5b,  
     break; ? }kG`q  
   } 1Cv-  
   for(int index=0;index<MAX_KEY;index++) mF,Y?ax  
   { &Low/Y'.jJ  
    if(hCallWnd[index]==NULL) 8W,Jh8N6  
     continue; P:k>aHnW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) X voo=  
    { /5Oa,NS7  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); }]lr>"~y}  
     bProcessed=TRUE;  UA48Ug  
    } 6L"%e!be6  
   } HY&aV2|A1  
  } +trC,D  
  if(!bProcessed){ #xX5,r0  
   for(int index=0;index<MAX_KEY;index++){  %oZ6l*  
    if(hCallWnd[index]==NULL) amOnqH-(  
     continue; n%-R[vW  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) * +"9%&?  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 3%E }JU?MM  
   } ST:A<Da"  
  } ]rWgSID  
 } Y }$/e  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); xv(9IEjt0  
} |iE50,  
YQHw1  
BOOL InitHotkey()  >qS9PX  
{ lQ" p !  
 if(hHook!=NULL){ 6kpg+{;  
  nHookCount++; &cxRD  
  return TRUE; 'ig&$fzb  
 } ?OcJ )5C4  
 else 8u6:=fxb  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); O_wEcJPE  
  if(hHook!=NULL) 2NC.Z;  
   nHookCount++; fZ0M%f  
  return (hHook!=NULL); '=39+*6?  
} Z-^LKe  
BOOL UnInit() z6U\axO6  
{ V[RF </2T  
 if(nHookCount>1){ &q3"g*q  
  nHookCount--; %aHB"vi6  
  return TRUE; V\>K]mwD  
 } ),0g~'I~D  
 BOOL unhooked = UnhookWindowsHookEx(hHook); p)jk>j B  
 if(unhooked==TRUE){ L9r8BK;  
  nHookCount=0; vleS2-]|  
  hHook=NULL;  ]3x?  
 } QiQ_bB!\  
 return unhooked; c?tBi9'Y]  
} 4;w;'3zq  
/sUYU (3  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P60~ V"/P  
{ A}BVep@D  
 BOOL bAdded=FALSE; -C;^ 3R[ O  
 for(int index=0;index<MAX_KEY;index++){ 5-|:^hU9  
  if(hCallWnd[index]==0){ O [\i E5+$  
   hCallWnd[index]=hWnd; aAZZ8V  
   HotKey[index]=cKey; cm&nd'A't  
   HotKeyMask[index]=cMask; PxTwPl  
   bAdded=TRUE; RU'=ERYC  
   KeyCount++; wu7Lk3  
   break; $~~Jw]   
  } Ar%%}Gx /  
 } <C_jF  
 return bAdded; JUsQ,ETn  
} +M./@U*g  
o@r7 n>G  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) -j+UMlkB  
{ HD@$t)mn  
 BOOL bRemoved=FALSE; Gk. ruQW"  
 for(int index=0;index<MAX_KEY;index++){ e{h<g>7  
  if(hCallWnd[index]==hWnd){ m.JBOq=  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ =qoWCmg"&  
    hCallWnd[index]=NULL; 7G:s2432  
    HotKey[index]=0; "$~':) V"  
    HotKeyMask[index]=0; :I"2V  
    bRemoved=TRUE; XQrF4l  
    KeyCount--; .\\DKh%  
    break; !lREaSM  
   } GX)u|g  
  } >Y&N8PHD  
 } nxY\|@  
 return bRemoved; b1?#81  
} P]<4R:yb  
N@;?CKU  
void VerifyWindow() \n"{qfn`r  
{ y>R=`A1b  
 for(int i=0;i<MAX_KEY;i++){ u~r=)His  
  if(hCallWnd!=NULL){ pe0F0Ruy  
   if(!IsWindow(hCallWnd)){ ~< P 0]ju  
    hCallWnd=NULL; bo<~jb{  
    HotKey=0;  N O2XA\  
    HotKeyMask=0; t#yk ->,  
    KeyCount--; (ScxLf=]  
   } n+! AnKq  
  } 214Ml0/%  
 } g6W)4cC8a  
} Qf58ig-vCY  
+cWLjPD/}  
BOOL CHookApp::InitInstance() 062,L~&E  
{ @M<|:Z %.@  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); anuL1f XO  
 hins=AfxGetInstanceHandle();  ^le<}  
 InitHotkey(); xpNH?#&  
 return CWinApp::InitInstance(); =31"fS@  
} sI43@[  
:KH g&ZX7  
int CHookApp::ExitInstance() [l:x'_y  
{ H1 2Fw'2  
 VerifyWindow(); !y#"l$"xK  
 UnInit(); 6f;fx}y  
 return CWinApp::ExitInstance(); 4)E_0.C  
} I\hh8abAp  
vrl;"Fm+  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file z^KJ*E  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kM!kD4&  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ Pnw]Tm}g  
#if _MSC_VER > 1000 PEN \-*Pv  
#pragma once o-;E>N7t  
#endif // _MSC_VER > 1000 6L:x^bM  
ml2_ ]3j!  
class CCaptureDlg : public CDialog xE1 eT,  
{ <DpevoF  
 // Construction (VS5V31"  
 public: L%">iQOG#  
  BOOL bTray; b>_o xK  
  BOOL bRegistered; PxF <\pu&  
  BOOL RegisterHotkey(); 2Fy>.*,?  
  UCHAR cKey; eeIhed9  
  UCHAR cMask; ~L]|?d"  
  void DeleteIcon(); dL:-Y.?0M  
  void AddIcon(); k")R[)92b?  
  UINT nCount; %lL.[8r|  
  void SaveBmp(); =nz}XH%=  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor JROM_>mC  
  // Dialog Data IOTR/anu  
  //{{AFX_DATA(CCaptureDlg) *?o{9v5}(  
  enum { IDD = IDD_CAPTURE_DIALOG }; 8'n/?.7cX  
  CComboBox m_Key; aF8fqu\  
  BOOL m_bControl; hhb?6]Z/  
  BOOL m_bAlt; _AYXc] 4%  
  BOOL m_bShift; b6W2^tr-  
  CString m_Path; hp8%.V$f  
  CString m_Number;  rL/H2[d  
  //}}AFX_DATA $`APHjijN  
  // ClassWizard generated virtual function overrides Ok>gh2e[c  
  //{{AFX_VIRTUAL(CCaptureDlg) 2#o>Z4 r{  
 public: D@G\7 KH@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); ttXXy3G#  
 protected: "-_fv5jL  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support LY6;.d$J  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); BLN^ <X/  
  //}}AFX_VIRTUAL $4-$pL6"  
  // Implementation 3Uqr,0$p  
 protected: &-s'BT[PGq  
  HICON m_hIcon; qNI, 62  
  // Generated message map functions KiRUvWqa  
  //{{AFX_MSG(CCaptureDlg)  pnMEB,)  
  virtual BOOL OnInitDialog(); ~i@Y|38C  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); qe#P?[  
  afx_msg void OnPaint(); g wz7krUTe  
  afx_msg HCURSOR OnQueryDragIcon(); HN_d{ 3  
  virtual void OnCancel(); CQZgMY1{  
  afx_msg void OnAbout(); b'P eH\h{  
  afx_msg void OnBrowse(); wpN k+;  
  afx_msg void OnChange(); } $uxJB  
 //}}AFX_MSG 3:5 &Aa!  
 DECLARE_MESSAGE_MAP() ?aC'.jH+  
}; 6`!Fv-  
#endif |nbf'  
n$U#:aQE  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file )Y]{HQd  
#include "stdafx.h" ii%+jdi.  
#include "Capture.h" KQcs3F@t  
#include "CaptureDlg.h" df*5,NV'-*  
#include <windowsx.h> uqM yoIc  
#pragma comment(lib,"hook.lib") @)-sTgn  
#ifdef _DEBUG Wqc)Fv70m  
#define new DEBUG_NEW D6CS8 ~"  
#undef THIS_FILE p>vn7;s2#  
static char THIS_FILE[] = __FILE__; !icT/5  
#endif _8Z_`@0  
#define IDM_SHELL WM_USER+1 I6j$X6u  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); aaKN^fi&  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ;=geHiQHA  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; I<Ksi~*i  
class CAboutDlg : public CDialog m~@;~7Ix  
{ %ThyOl@O  
 public: ? 9! Z<H  
  CAboutDlg(); 7a#4tqM#  
  // Dialog Data 53c0 E  
  //{{AFX_DATA(CAboutDlg) '7D,m H  
  enum { IDD = IDD_ABOUTBOX }; N+LL@[  
  //}}AFX_DATA PlF87j (  
  // ClassWizard generated virtual function overrides W3Dc r@Dy  
  //{{AFX_VIRTUAL(CAboutDlg) k=4N(i/s  
 protected: SF}<{x_  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7@Zx@  
  //}}AFX_VIRTUAL |fxA|/ s[<  
  // Implementation 6lk l7zm  
 protected: nt;haeJ  
  //{{AFX_MSG(CAboutDlg) 5nTY ?<x`k  
  //}}AFX_MSG <EPj$::  
  DECLARE_MESSAGE_MAP() %uJ<M-@r=u  
}; "VkTY|a  
KBXK0zWh7  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 2H/Z_+\  
{ Ct2j ZqCDo  
 //{{AFX_DATA_INIT(CAboutDlg) zUkN 0  
 //}}AFX_DATA_INIT !>BZ6gn5  
} t<T[h2Wd  
D'L'#/hK  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) AS E91T~  
{ {o!KhF:[  
 CDialog::DoDataExchange(pDX); 'xhcuVl  
 //{{AFX_DATA_MAP(CAboutDlg) CM<]ZG7  
 //}}AFX_DATA_MAP b !%hH  
} B=>RH!&  
0dA7pY9  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) &;XAuDw4+i  
 //{{AFX_MSG_MAP(CAboutDlg) J 8M$k/"X  
 // No message handlers %9k!A]KD  
 //}}AFX_MSG_MAP TMs,j!w?I  
END_MESSAGE_MAP() 'fcMuBc+ 4  
JYrY[',u  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) L KCb_9  
: CDialog(CCaptureDlg::IDD, pParent) {%VV\qaC  
{ hq:&wN 7Q  
 //{{AFX_DATA_INIT(CCaptureDlg) -+7uy.@cS  
  m_bControl = FALSE; A a= u+  
  m_bAlt = FALSE; y" 6y!  
  m_bShift = FALSE; 7_.11$E=H  
  m_Path = _T("c:\\"); RlqQ  
  m_Number = _T("0 picture captured."); -b9;5eS!  
  nCount=0; UPc<gB  
  bRegistered=FALSE; M t*6}Cl  
  bTray=FALSE; /,MJq#@K  
 //}}AFX_DATA_INIT zaFt*~@X  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Kx. X7R  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); UK$ms~H  
} Yly@ww9t|  
K,6b3kk  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) @*0cMO;SpG  
{ R*oXmuOsYA  
 CDialog::DoDataExchange(pDX); 26dUA~|KJ  
 //{{AFX_DATA_MAP(CCaptureDlg) @WQK>-=(3  
  DDX_Control(pDX, IDC_KEY, m_Key); [6)UhS8  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ly4s"4v  
  DDX_Check(pDX, IDC_ALT, m_bAlt); d{3@h+zL  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); JXixYwm  
  DDX_Text(pDX, IDC_PATH, m_Path); I.Y['%8,5~  
  DDX_Text(pDX, IDC_NUMBER, m_Number); ZT[3aXS  
 //}}AFX_DATA_MAP BnCKSg7V  
} R64!>o"nED  
Ul_M3"Z  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) anj#@U;!  
//{{AFX_MSG_MAP(CCaptureDlg) Qd_Y\PzS  
 ON_WM_SYSCOMMAND() gP-nluq  
 ON_WM_PAINT() QDTBWM%  
 ON_WM_QUERYDRAGICON() osOVg0Gyj  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) l"{Sm6:;-  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 6 4D]Ypx  
 ON_BN_CLICKED(ID_CHANGE, OnChange) W(25TbQ  
//}}AFX_MSG_MAP :qR=>n=  
END_MESSAGE_MAP() Wxk x,q?  
T/c<23i  
BOOL CCaptureDlg::OnInitDialog() [w0/\]o  
{ X; 5Jb  
 CDialog::OnInitDialog(); /w8"=6Vv~  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); d'*]ns  
 ASSERT(IDM_ABOUTBOX < 0xF000); lJzl6&  
 CMenu* pSysMenu = GetSystemMenu(FALSE); X53mzs  
 if (pSysMenu != NULL) 4J|t?]ij|E  
 { B-*E:O0y  
  CString strAboutMenu; R#n%cXc|  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 'q>2t}KG  
  if (!strAboutMenu.IsEmpty()) Uu"0rUzt  
  { Um)>2|rp}  
   pSysMenu->AppendMenu(MF_SEPARATOR); FG%j {_Ez  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); TZ;p0^(  
  } (>=7ng^  
 } >sD4R}\})  
 SetIcon(m_hIcon, TRUE); // Set big icon 1AHx"e,;L  
 SetIcon(m_hIcon, FALSE); // Set small icon RGIoI ]_  
 m_Key.SetCurSel(0); ?( =p<TUw  
 RegisterHotkey(); 1^dJg8  
 CMenu* pMenu=GetSystemMenu(FALSE); 6yu]GK} es  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); G ){g  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); <w>/^|]#  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 1/ZR*f a  
 return TRUE; // return TRUE unless you set the focus to a control #fs|BV !  
} w?mEuXc  
85IMdZ7I  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) (X+s-4%  
{ xM s]Hs  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) J4 tcQ  
 { L{ho*^b  
  CAboutDlg dlgAbout; r]P,9  
  dlgAbout.DoModal(); =q(GHg;'  
 } g,]@4|  
 else bm}6{28R  
 { sT1&e5`W  
  CDialog::OnSysCommand(nID, lParam); s?3i) Ymr  
 } Qn:kz*:  
} _2hXa!yO  
@!Hr|k|  
void CCaptureDlg::OnPaint() b-@\R\T  
{ P2 0|RvE  
 if (IsIconic()) ,>LRa  
 { "Vd_CO  
  CPaintDC dc(this); // device context for painting g):]'  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); (LJ@S eM;  
  // Center icon in client rectangle 68R1AqU_  
  int cxIcon = GetSystemMetrics(SM_CXICON); Vv*NFJ|  
  int cyIcon = GetSystemMetrics(SM_CYICON); kw,$NK'  
  CRect rect; mzD^ Y<LTd  
  GetClientRect(&rect); zzZg$9PT[  
  int x = (rect.Width() - cxIcon + 1) / 2; uH\kQ9f  
  int y = (rect.Height() - cyIcon + 1) / 2; 8 Op.eYe  
  // Draw the icon kGN||h  
  dc.DrawIcon(x, y, m_hIcon); >_ X/[<  
 }  0=6/yc  
 else ,smF^l   
 { cs_}&!c{  
  CDialog::OnPaint(); uD>z@J-v  
 } beZ(o?uK  
} oP,9#FC|(  
GlR~%q-jiQ  
HCURSOR CCaptureDlg::OnQueryDragIcon() , fb( WY  
{ Vm8D"I5i  
 return (HCURSOR) m_hIcon; W"hcaa,&  
} FA>1x*;c  
=qoRS0Qa  
void CCaptureDlg::OnCancel() (U87}}/l  
{ Sl~x$9`  
 if(bTray) Ie'P#e'  
  DeleteIcon(); FUeq \Wuo  
  CDialog::OnCancel(); 3@5p"X  
} 6~5$s1Yc  
&1)xoZ'\  
void CCaptureDlg::OnAbout() #iis/6"  
{ $V8vrT#:  
 CAboutDlg dlg; uhn%lV]  
 dlg.DoModal(); 0^_MN~s(X  
} ,EhVSrh)_4  
@R:#"  
void CCaptureDlg::OnBrowse() +lp{#1q0  
{ 73DlRt *  
 CString str; V,QwN&  
 BROWSEINFO bi; )teFS %  
 char name[MAX_PATH]; U6WG?$x  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); ]b[,LwB\`~  
 bi.hwndOwner=GetSafeHwnd(); Qp:6= o0:  
 bi.pszDisplayName=name; +cfziQ$'  
 bi.lpszTitle="Select folder"; 3-Y=EH_0  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; *Wyl2op6  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6$B'Q30}r  
 if(idl==NULL) b!~TAT&8  
  return; e`DsP8-&v  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); a%[q |oyR  
 str.ReleaseBuffer(); %F$N#YG  
 m_Path=str; ATO 5  
 if(str.GetAt(str.GetLength()-1)!='\\') =49o U  
  m_Path+="\\"; T8q[7Zn  
 UpdateData(FALSE); 3}M \c)  
} oYq,u@oM  
di_gWE  
void CCaptureDlg::SaveBmp() ]N\6h(**wy  
{ -c$z 2Q)  
 CDC dc; Fg@ ACv'@  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); U+!UL5k  
 CBitmap bm; RdkU2Y}V  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9 x [X<  
 int Height=GetSystemMetrics(SM_CYSCREEN); FH -p!4+]  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8on[%Vk  
 CDC tdc; lQr6;D}+  
 tdc.CreateCompatibleDC(&dc); b3^R,6]x&  
 CBitmap*pOld=tdc.SelectObject(&bm); x(yX0 ,P/7  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); AFtCqq#[  
 tdc.SelectObject(pOld); )=(n/vckM  
 BITMAP btm; qj;l,Kua  
 bm.GetBitmap(&btm); ;siJ~|6)  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; ris;Iu^v0  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;Bnr=' [  
 BITMAPINFOHEADER bih; U$@83?O{iM  
 bih.biBitCount=btm.bmBitsPixel; o~}1 oN  
 bih.biClrImportant=0; oYg/*k7EDX  
 bih.biClrUsed=0; 45r|1<Ro  
 bih.biCompression=0; 0Ts!(b]B  
 bih.biHeight=btm.bmHeight; !SN WB  
 bih.biPlanes=1; <!hpfTz*  
 bih.biSize=sizeof(BITMAPINFOHEADER); CMKhS,,o  
 bih.biSizeImage=size; 8+L7E-  
 bih.biWidth=btm.bmWidth; 7n [12:  
 bih.biXPelsPerMeter=0; &V FjH W  
 bih.biYPelsPerMeter=0; %,Q;<axzi  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); S].Ft/+H  
 static int filecount=0; cC' ^T6  
 CString name; Y"s )u7  
 name.Format("pict%04d.bmp",filecount++); xf[z EEt  
 name=m_Path+name; y 2cL2c$BT  
 BITMAPFILEHEADER bfh; s?~8O|Mu'  
 bfh.bfReserved1=bfh.bfReserved2=0; +H?<}N*T  
 bfh.bfType=((WORD)('M'<< 8)|'B'); )fy <P;g  
 bfh.bfSize=54+size; Y+OYoI  
 bfh.bfOffBits=54; B>ge, }{  
 CFile bf; a$laRtId7  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ e%'z=%(  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); P7cge  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); 91U^o8y  
  bf.WriteHuge(lpData,size); - a   
  bf.Close(); [U% .Gi  
  nCount++; [}jj<!9A_;  
 } y4 dp1<t%  
 GlobalFreePtr(lpData); wK2yt?  
 if(nCount==1) V^9$t/c &  
  m_Number.Format("%d picture captured.",nCount); -MQZiq7H4  
 else xcAF  
  m_Number.Format("%d pictures captured.",nCount); d.L OyO  
  UpdateData(FALSE); +p8qsT#7  
} [vZfH!vLP  
JTSq{NN  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) M-}j9,oR`  
{ C+X)">/+L  
 if(pMsg -> message == WM_KEYDOWN) *4r s  
 { E_ o{c5N  
  if(pMsg -> wParam == VK_ESCAPE) 4jDs0Hn"  
   return TRUE; " whO}  
  if(pMsg -> wParam == VK_RETURN) iMP*]K-O  
   return TRUE; bbfDt^  
 } oV%( 37W9=  
 return CDialog::PreTranslateMessage(pMsg); KyuA5jQ7  
} % JgRcx  
</K%i;l  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) e6tH/`Uln  
{ stf,<W  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ _)HD4,`  
  SaveBmp(); j;ff } b  
  return FALSE; <^H1)=tlF  
} Qx6,>'Qk'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ J=f:\]@Oy  
 CMenu pop; < fojX\}3  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); A^}i^  
 CMenu*pMenu=pop.GetSubMenu(0); 0A) Vtj$  
 pMenu->SetDefaultItem(ID_EXITICON); &4w\6IR  
 CPoint pt; Verbmeg&n  
 GetCursorPos(&pt); ^yEj]]6  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); o 2[vM$]  
 if(id==ID_EXITICON) : ;E7+m  
  DeleteIcon(); [4K9|/J  
 else if(id==ID_EXIT) CT$& zEIm  
  OnCancel(); W+F<P@[u<$  
 return FALSE; 2b 6? 9FX*  
} ,7n;|1`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); C8bGae(  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) (T>?8 K _d  
 AddIcon(); iylBK!ou  
 return res; N$=(1`zM=  
} 7- *( a  
|Ak =-.  
void CCaptureDlg::AddIcon() VuX >  
{ Yj^avO=;  
 NOTIFYICONDATA data; 6b#:H~ <  
 data.cbSize=sizeof(NOTIFYICONDATA); F #!@}K8  
 CString tip; X]&;8  
 tip.LoadString(IDS_ICONTIP); '%n<MTL  
 data.hIcon=GetIcon(0);  K$37}S5  
 data.hWnd=GetSafeHwnd(); L5V'Sr  
 strcpy(data.szTip,tip); .pB8=_e:  
 data.uCallbackMessage=IDM_SHELL; 6)uPM"cO  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; EMVoTW)z  
 data.uID=98; "2#-xOCO  
 Shell_NotifyIcon(NIM_ADD,&data); oUKBb&&O  
 ShowWindow(SW_HIDE); i&}zcGC  
 bTray=TRUE; 1Rb XM n  
} ^.Ih,@N6  
,E/Y@sajn+  
void CCaptureDlg::DeleteIcon() ?'ez.a}  
{ =x='<{jtgW  
 NOTIFYICONDATA data; ')~Y  
 data.cbSize=sizeof(NOTIFYICONDATA); [0tf Y0  
 data.hWnd=GetSafeHwnd(); v3hQv)j)  
 data.uID=98; 8XS {6<  
 Shell_NotifyIcon(NIM_DELETE,&data); XL.CJ5y>  
 ShowWindow(SW_SHOW); k+7M|t.?4  
 SetForegroundWindow(); O#Zs3k  
 ShowWindow(SW_SHOWNORMAL); p^4;fD  
 bTray=FALSE;  ^ :  
} fzkCI  
Q~b M  
void CCaptureDlg::OnChange() c:@OX[##  
{ >^a"Z[s[  
 RegisterHotkey(); j J`Zz  
} ulPrb>i  
evg 7d  
BOOL CCaptureDlg::RegisterHotkey() "z#?OV5  
{ aaqd:N)  
 UpdateData(); 'wB Huq  
 UCHAR mask=0; ;Xd\$)n  
 UCHAR key=0; k+q6U[ce  
 if(m_bControl) yhkQFB%gv  
  mask|=4; F~Z 0  
 if(m_bAlt) picP_1L  
  mask|=2; CF}Nom)  
 if(m_bShift) A%m `LKV~@  
  mask|=1; zs&`:  
  key=Key_Table[m_Key.GetCurSel()]; /L|}Y242  
 if(bRegistered){ +81+4{*  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); &G,o guo  
  bRegistered=FALSE; NdSxWrD`m  
 } "g:&Ge*X  
 cMask=mask; /qq&'}TZP  
 cKey=key; muX4Y1M_  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); yoY)6cn@  
 return bRegistered; Sw( H]  
} \\G6c4 fC  
GK+\-U)v  
  四、小结 LLHOWD C(2  
fG$.DvJuK  
  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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