社区应用 最新帖子 精华区 社区服务 会员列表 统计排行 社区论坛任务 迷你宠物
  • 5984阅读
  • 0回复

用Visual C++实现屏幕抓图程序

级别: 终身会员
发帖
3743
铜板
8
人品值
493
贡献值
9
交易币
0
好评度
3746
信誉值
0
金币
0
所在楼道
 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: WD5jO9Oai  
  b\t?5z-Z  
  一、实现方法 qT01@Bku  
?4#  
  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: G^Y^)pc]   
)LsUO#%DO  
#pragma data_seg("shareddata") *to#ZMR;!  
HHOOK hHook =NULL; //钩子句柄 i*8j|  
UINT nHookCount =0; //挂接的程序数目 l3+G]C&<  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 3sgo5D-rMI  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 /z(d!0_q|v  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey Jpy~5kS  
static int KeyCount =0; pq%inSY  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 qeC^e}h  
#pragma data_seg() oN)I3wO$  
RRro.r,  
  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。 d6ifJ  
E B! ,t  
  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: #=72 /[  
cYvt!M\ed  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR r?|(t?  
cKey,UCHAR cMask) g-H,*^g+  
{ QVah4wFL*.  
 BOOL bAdded=FALSE; GPx+]Jw8\  
 for(int index=0;index<MAX_KEY;index++){ :UX8^+bfZ  
  if(hCallWnd[index]==0){ -c{Y+M`  
   hCallWnd[index]=hWnd; '$VP\Gj.  
   HotKey[index]=cKey; [+ : zlA  
   HotKeyMask[index]=cMask; t. HwX9  
   bAdded=TRUE; HdyE`FY\  
   KeyCount++;  C~^T=IP  
   break; 3NdO3-~)  
  } $oJjgAxcZ  
 } #bCUI*N"P  
 return bAdded; =@&>r5W1  
} s@g _F  
//删除热键 7#N ?{3i  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) "Xl"H/3r  
{ rHqP[[4B'  
 BOOL bRemoved=FALSE; a@AIv"q  
 for(int index=0;index<MAX_KEY;index++){ RjR+'<7E^  
  if(hCallWnd[index]==hWnd){ E>:#{%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ 'e6J&X  
    hCallWnd[index]=NULL; WEoD ?GLS8  
    HotKey[index]=0; 8Pva]Q  
    HotKeyMask[index]=0; 7jr+jNsowj  
    bRemoved=TRUE; hu7o J H  
    KeyCount--; 2@Q5Ta #h  
    break; ].Ra=^q  
   } |,({$TrF  
  } Y\ ;hjxR-  
 } sLzZ}u?(  
 return bRemoved; bM }zGFt  
} 2IP<6l8N  
=$T[  
MwL!2r  
  DLL中的钩子函数如下: EWXv3N2)  
-=n!k^?lK  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) EpTc{  
{ Rl_1g`84  
 BOOL bProcessed=FALSE; j3S!uA?  
 if(HC_ACTION==nCode) ?T,a(m<i {  
 { ~mZ[@ Z  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 -a l  
   switch(wParam) 69t6lB#;!  
   {  \^!<Y\\  
    case VK_MENU: 3Vk\iJ  
     MaskBits&=~ALTBIT; - ~*kAh  
     break; !Q,Dzv"7  
    case VK_CONTROL: cY+n 6k5  
     MaskBits&=~CTRLBIT; NCYOY  
     break; vst;G-ys  
    case VK_SHIFT: e`+ej-o,  
     MaskBits&=~SHIFTBIT; `Gx 5=Bm;  
     break; gc b8eB ,  
    default: //judge the key and send message }*!_M3O  
     break; JdUI:(  
   } 9|NF)~Q}'  
   for(int index=0;index<MAX_KEY;index++){ a/rQ@c>  
    if(hCallWnd[index]==NULL) 'R#MH  
     continue; ]ki) (Bb  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <e wcWr  
    { xa 967Ki9"  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); gt=@v())  
     bProcessed=TRUE; P,7R/-u5D  
    } y'<5P~W!a  
   } FuAs$;  
  } K;`W4:,  
  else if((lParam&0xc000ffff)==1){ //有键按下 |o ^mg9  
   switch(wParam) j'Gezx^.<e  
   { &g=6K&a$a  
    case VK_MENU: tVNFulcz$  
     MaskBits|=ALTBIT; .x}xa  
     break; 1suP7o A;  
    case VK_CONTROL: Tt_QAIl  
     MaskBits|=CTRLBIT; ,>nf/c0.  
     break; !<F5W <V  
    case VK_SHIFT: \K lY8\c[  
     MaskBits|=SHIFTBIT; ^rGuyW#  
     break; };'~@%U]/  
    default: //judge the key and send message .R#<Q  
     break; kt7Emb}  
   } 2+K - I  
   for(int index=0;index<MAX_KEY;index++){ D+w ?  
    if(hCallWnd[index]==NULL) ty@D3l  
     continue; {@'#|]4y.  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) W@+ge]9m&  
    { 0Ca/[_  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); e5w0}/yW/  
     bProcessed=TRUE; [Kb)Q{=)  
    } B"`86qc  
   } d6zq,x!cI  
  } kk OjAp{<t  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 ;g?o~ev 8  
   for(int index=0;index<MAX_KEY;index++){ n<eK\ w  
    if(hCallWnd[index]==NULL) 6I|9@~!y[  
     continue; cet|k!   
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) d_ &~^*>  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); Gsy90  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 M=1~BZQ(Z  
   } )/z+W[t  
  } l {\k\Q!4  
 } :>jzL8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;0Ih:YY6  
} L9l]0C37e  
6kONuG7Yv  
  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: `:dGPB BO  
}{[p<pU$C  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); ++!0r['+ >  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);  ,0i72J  
MB6lKLy6~  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: KPZqPtb;  
,8DjQz0ZPo  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) "ER= c3 t  
{ 20M]gw]  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) cA{,2CYc  
 { kZcGe*  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 N0YJ'.=8,  
  SaveBmp(); N*KM6j  
  return FALSE; " "CNw-^t  
 } BtQqUk#L2  
 …… //其它处理及默认处理 L f;Uv[^c  
} |9)y<}c5oM  
Pb7-pu5 X  
5X^`qUSv  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 J$(79gH{  
yQFZRDV~  
  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。 461p4)  
JK'tdvs~  
  二、编程步骤 [h.i,%Ua"P  
#*  8^ar<  
  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"; kcP&''  
x139Ckn  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; #BIY[{!  
I=k`VId:  
  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; R1/mzPG  
yp pZ@  
  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; vtq47i  
WmblY2  
  5、 添加代码,编译运行程序。 vs*@)'n0}  
j$k/oQ  
三、程序代码 %'9&JsO  
Ft@ZK!'@  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL yq`  ,)  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) `CG% Y>+  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ prGp/"E  
#if _MSC_VER > 1000 zKf0 :X  
#pragma once zH *7!)8  
#endif // _MSC_VER > 1000 KPa@~rU  
#ifndef __AFXWIN_H__ - ysd`&  
#error include 'stdafx.h' before including this file for PCH raZ0B,;eFu  
#endif )+a]M1j  
#include "resource.h" // main symbols T 6=~vOzTJ  
class CHookApp : public CWinApp <7j"CcJzZ  
{ GJBMaT  
 public: K3`48,`?wA  
  CHookApp(); %:Zp7O2UB'  
  // Overrides Rts}y:44  
  // ClassWizard generated virtual function overrides iv6bXV'N  
  //{{AFX_VIRTUAL(CHookApp) x' 3kHw  
 public: %;O# y3,  
  virtual BOOL InitInstance(); okBaQH2lUl  
  virtual int ExitInstance(); XE;aJ'kt  
  //}}AFX_VIRTUAL rTeADu_vf  
  //{{AFX_MSG(CHookApp) 'uLYah  
  // NOTE - the ClassWizard will add and remove member functions here. px^brzLQo  
  // DO NOT EDIT what you see in these blocks of generated code ! Bs<LJzS{V  
  //}}AFX_MSG e!4Kl:  
  DECLARE_MESSAGE_MAP() nyPW6VQ0n  
}; W\z<p P  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); uJJP<mDgA  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); -n6T^vf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); `^DP<&{  
BOOL InitHotkey(); bE"J&;|  
BOOL UnInit(); tBE-:hX*  
#endif '>% c@C[  
lp5 b&I_  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. ,fyqa  
#include "stdafx.h" sV`XJ9e|  
#include "hook.h" Aoy=gK  
#include <windowsx.h> zi,":KDz#  
#ifdef _DEBUG w6[$vib'  
#define new DEBUG_NEW o q cu<]  
#undef THIS_FILE P1"g62R  
static char THIS_FILE[] = __FILE__; 9~}8?kPNw=  
#endif Q0TKM >  
#define MAX_KEY 100 6`)Ss5jzk  
#define CTRLBIT 0x04 NqN9  
#define ALTBIT 0x02  83:qIfF  
#define SHIFTBIT 0x01 \3cg\Q+~  
#pragma data_seg("shareddata") OLDEB.@  
HHOOK hHook =NULL; UG,n q  
UINT nHookCount =0; 1i$OcN?x%  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey TK#-;p_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT T!Uf PfEI  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey [.4D<}e  
static int KeyCount =0; #M8>)oc  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift Jl89}Sf  
#pragma data_seg() =L}$#Y8?  
HINSTANCE hins; OC2%9Igx0  
void VerifyWindow(); s9BdmD^|#  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) Nv\<>gA:  
//{{AFX_MSG_MAP(CHookApp) @%#!-wC-5  
// NOTE - the ClassWizard will add and remove mapping macros here. yx/qp<=  
// DO NOT EDIT what you see in these blocks of generated code! A|P `\_  
//}}AFX_MSG_MAP b'4r5@GO  
END_MESSAGE_MAP() #pX+~ {  
'Ie!%k^  
CHookApp::CHookApp() - o sxKT:  
{ qAuq2pHA+d  
 // TODO: add construction code here, v5`Odbc=w  
 // Place all significant initialization in InitInstance )"y]_}  
} A;Uw b  
Py#iC#g~  
CHookApp theApp; 8hvh xp  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) X[o"9O|<  
{ l,1.6  
 BOOL bProcessed=FALSE; iTeFy -Ct  
 if(HC_ACTION==nCode) 7R".$ p  
 { Mer\W6e"e  
  if((lParam&0xc0000000)==0xc0000000){// Key up pPZ^T5-ks  
   switch(wParam) /4u:5G  
   { 8\8%FSrc  
    case VK_MENU: hin6cac  
     MaskBits&=~ALTBIT; OTwXc*2u]  
     break; kA&ul  
    case VK_CONTROL: wGA%h.[M|  
     MaskBits&=~CTRLBIT; =|bW >y  
     break; eR5+1b  
    case VK_SHIFT: nB86oQ/S  
     MaskBits&=~SHIFTBIT; & A@ !g  
     break; m{sch`bP  
    default: //judge the key and send message 74*iF'f?c  
     break; Gh9dv|m=[;  
   } hdee]qLS  
   for(int index=0;index<MAX_KEY;index++){ vghn+P8  
    if(hCallWnd[index]==NULL) &8 4Izs/[  
     continue; 7$I *ju_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) >.#tNFAs  
    { 'P~6_BW  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); =u]FKY  
     bProcessed=TRUE; eFCXjM  
    } t8FgQ)tk  
   } U*em)/9  
  } 60Obek`  
  else if((lParam&0xc000ffff)==1){ //Key down %uhhQ<zs%  
   switch(wParam) We*c_;@<  
   { Q Ph6 p3bg  
    case VK_MENU: MBH/,Yd  
     MaskBits|=ALTBIT; yj{:%Km:`  
     break; 9 8eS f  
    case VK_CONTROL: MHKB:t]hA  
     MaskBits|=CTRLBIT; {p@uj_pS  
     break; j\8'P9~%  
    case VK_SHIFT: ) BLoj:gYn  
     MaskBits|=SHIFTBIT; &;k`3`MC~w  
     break; V/7?]?!xu  
    default: //judge the key and send message YJ^TO\4WM  
     break; @Ao E>  
   } oJTsrc_ -  
   for(int index=0;index<MAX_KEY;index++) Q CB~x2C  
   { o] 7U;W  
    if(hCallWnd[index]==NULL) R!LKGiN  
     continue; ss>?fyA  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) A?8 29<  
    { -d6*M*{|  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); L #l|}u  
     bProcessed=TRUE; Jv=G3=.  
    } XS/5y(W  
   } 0,`$KbV\  
  } E={W^k!Vz:  
  if(!bProcessed){ }~28UXb23  
   for(int index=0;index<MAX_KEY;index++){ >xE{& ):  
    if(hCallWnd[index]==NULL) ~cEr <mzR  
     continue; >K;'dB/m;1  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) MhpR^VM'.  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); .U !;fJ9  
   } 3 e9fziQ~  
  } SbW6O_   
 } ba   
 return CallNextHookEx( hHook, nCode, wParam, lParam ); d\ Z#XzI8  
} &Wup 7  
v+Q# O[  
BOOL InitHotkey() (_lc< Bj  
{ 'u2Qq"d+  
 if(hHook!=NULL){ AFSFXPl "  
  nHookCount++; {XNu4d9w(  
  return TRUE;  VgNt  
 } q}["Nww-  
 else jTx,5s-  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); [Pt5c6L:  
  if(hHook!=NULL)  Dk fw*Oo  
   nHookCount++; TY|]""3 f9  
  return (hHook!=NULL); f V.(v&  
} wFaWLC|&  
BOOL UnInit() N7xkkAS{  
{ :Y[r^=>  
 if(nHookCount>1){ Yg#)@L  
  nHookCount--; s"?&`S  
  return TRUE; qEpP%p  
 } IczEddt@'  
 BOOL unhooked = UnhookWindowsHookEx(hHook); d0 tN73(  
 if(unhooked==TRUE){ `'[ 7M  
  nHookCount=0; `v)-v<  
  hHook=NULL; J)n g,i  
 } *{)![pDYd  
 return unhooked; ~>)GW  
}  iV71t17  
WiL~b =fT  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) P + nT%  
{ mYk5f_}  
 BOOL bAdded=FALSE; X 3Vpxtb  
 for(int index=0;index<MAX_KEY;index++){ n.y72-&v  
  if(hCallWnd[index]==0){ y o[!q|z  
   hCallWnd[index]=hWnd; |[TH ~ o  
   HotKey[index]=cKey; pDlh^?cux  
   HotKeyMask[index]=cMask; V@K}'f~  
   bAdded=TRUE; <_H0Q_/(  
   KeyCount++; b`K~l'8  
   break; T+2I:W%  
  } ~4*9w3t   
 } q6{%vd  
 return bAdded; p$@=N6)I.k  
} GKPqBi[rO  
/kVy#sT|  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ?lU]J]  
{ }~-)31e'`  
 BOOL bRemoved=FALSE;  \'"q6y  
 for(int index=0;index<MAX_KEY;index++){ h3xX26l  
  if(hCallWnd[index]==hWnd){ 4#=!VK8ZH  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xb3vvHdI  
    hCallWnd[index]=NULL; eeb 8v:4  
    HotKey[index]=0; W^&t8d2  
    HotKeyMask[index]=0; tO?*x/XC{  
    bRemoved=TRUE; Q ;5'I3w  
    KeyCount--; k< W]VS3N  
    break; ld[]f*RuW  
   } NnSI=M  
  } uW[s?  
 } ce=6EYl  
 return bRemoved; miHW1h[=  
} VkhK2  
Z/uRz]Hi  
void VerifyWindow() qg6Hk:^r  
{ ,l7ty#j  
 for(int i=0;i<MAX_KEY;i++){ 6aQ{EO-]'=  
  if(hCallWnd!=NULL){ jO:<"l^+u  
   if(!IsWindow(hCallWnd)){ }+#ag:M  
    hCallWnd=NULL; qm]ljut  
    HotKey=0; #>ci!4Gz=Z  
    HotKeyMask=0; B?Y%y@.  
    KeyCount--; W.:k E|a.g  
   } %v~j10e  
  } 7X}_yMxc  
 } (DK pJCx  
} J(/ eR,ak  
oRWsi/Zf  
BOOL CHookApp::InitInstance() :@b>,{*4zS  
{ a9jY^E'|n  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); p7H*Ff`  
 hins=AfxGetInstanceHandle(); 05pCgI}F>  
 InitHotkey(); Z@C D1+G  
 return CWinApp::InitInstance(); s9`T%pg  
} NK#Dq&W+&  
[EGE|   
int CHookApp::ExitInstance() $X*$,CCIB  
{ //Tr=!TQu  
 VerifyWindow(); e$>5GM  
 UnInit(); F/EHU?_EI  
 return CWinApp::ExitInstance(); [S</QS!  
} <!OP b(g2  
tg8VFH2q.z  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file 1NOz $fW  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) ~Nc] `95  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "hlIGJ?_=  
#if _MSC_VER > 1000 oHi&Z$#!n  
#pragma once `(o1&  
#endif // _MSC_VER > 1000 dnIBAe  
g\ *gHHa  
class CCaptureDlg : public CDialog &*)tqQeQf  
{ BTd'bD~EA  
 // Construction LK:|~UV?  
 public: 6gR=e+  
  BOOL bTray; [[ s k  
  BOOL bRegistered; Y?%6af+  
  BOOL RegisterHotkey(); @MB;Ez v  
  UCHAR cKey; >9u6@  
  UCHAR cMask; 5E!|-xD  
  void DeleteIcon(); ^jmnE.8R  
  void AddIcon(); / V {w<  
  UINT nCount; 0U/:Tpyr  
  void SaveBmp(); *iC t4J  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor  B-&J]H  
  // Dialog Data Cq(Xa-  
  //{{AFX_DATA(CCaptureDlg) Y6D =tb  
  enum { IDD = IDD_CAPTURE_DIALOG }; ryn)  
  CComboBox m_Key; hU=J^Gi0  
  BOOL m_bControl; HWefuj  
  BOOL m_bAlt; Bgs~1E@8V  
  BOOL m_bShift; iPFYG  
  CString m_Path; BEI/OGp  
  CString m_Number; |[{;*wtv  
  //}}AFX_DATA GO?-z0V  
  // ClassWizard generated virtual function overrides ~l}TlRqL  
  //{{AFX_VIRTUAL(CCaptureDlg) ^c(PZ,/#JB  
 public: G0(c@FBK  
  virtual BOOL PreTranslateMessage(MSG* pMsg); E$ngmm[  
 protected: g3Xz-  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support <hK$Cf_  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); PO%]Jme  
  //}}AFX_VIRTUAL |t]9RC.;7  
  // Implementation ToMX7xz6  
 protected: .i=%gg  
  HICON m_hIcon; D{l.WlA.  
  // Generated message map functions uRL3v01?H0  
  //{{AFX_MSG(CCaptureDlg) AV2q*  
  virtual BOOL OnInitDialog(); 5r+0^UAO:J  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Y?5yzD:  
  afx_msg void OnPaint(); VUnEI oKM  
  afx_msg HCURSOR OnQueryDragIcon(); l.34h  
  virtual void OnCancel(); cLYc""=  
  afx_msg void OnAbout(); VmUM _Q~  
  afx_msg void OnBrowse(); f<}!A$wd  
  afx_msg void OnChange(); n]$vCP  
 //}}AFX_MSG 5AjK7[<L  
 DECLARE_MESSAGE_MAP() no/]Me!j=  
}; \iL,l87  
#endif tm|lqa  
T*{zL  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file R/Y/#X^b  
#include "stdafx.h" Cir =(  
#include "Capture.h" Ov<3?)ok  
#include "CaptureDlg.h" xLD6A5n,[  
#include <windowsx.h> *xl7;s  
#pragma comment(lib,"hook.lib") 4KM$QHS5{  
#ifdef _DEBUG iP!Y4F  
#define new DEBUG_NEW G/8xS=  
#undef THIS_FILE ?X9 =4Z~w  
static char THIS_FILE[] = __FILE__; 3=<iGX"z  
#endif #P4dx'vm  
#define IDM_SHELL WM_USER+1 52["+1g\  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); a[$.B2U  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); g~y9j88?  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; apMYBbC  
class CAboutDlg : public CDialog c0qv11,:t  
{ kCwTv:)  
 public: EIYM0vls(  
  CAboutDlg(); U.)G #B  
  // Dialog Data !}P FiT^  
  //{{AFX_DATA(CAboutDlg) Zn/9BO5  
  enum { IDD = IDD_ABOUTBOX }; t!T}Pg(Bo  
  //}}AFX_DATA F889JSZ%  
  // ClassWizard generated virtual function overrides jF3!}*7,  
  //{{AFX_VIRTUAL(CAboutDlg) R^2Uh$kk{A  
 protected: "{B ek<  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support qE`=^  
  //}}AFX_VIRTUAL h/fCCfO,  
  // Implementation @*uX[)  
 protected: 9V],X=y~  
  //{{AFX_MSG(CAboutDlg) J@GfO\ o  
  //}}AFX_MSG )]%9Tgn  
  DECLARE_MESSAGE_MAP()  `JE>GZ Y  
}; Me}TW!GC  
eTF8B<?  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) PD}R7[".>  
{ _RW[]MN3*  
 //{{AFX_DATA_INIT(CAboutDlg) psZeu*/r  
 //}}AFX_DATA_INIT bF KP V%`  
} jccW8g~ ~  
+_g T|vlU  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 46zaxcY<!  
{ da2[   
 CDialog::DoDataExchange(pDX); 0lRH Yu  
 //{{AFX_DATA_MAP(CAboutDlg) Z8&C-yCC  
 //}}AFX_DATA_MAP sv;zvEn;-L  
} ZW?7g+P  
UTTC:=F+  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) FqTkUWd,#  
 //{{AFX_MSG_MAP(CAboutDlg) jOb[h=B"  
 // No message handlers nP3GI:mjL  
 //}}AFX_MSG_MAP |wJZU  
END_MESSAGE_MAP() YF -w=Y6  
<nvWC/LU  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ?fmt@@]T?  
: CDialog(CCaptureDlg::IDD, pParent) z/YMl3$l~  
{ &5.~XM;  
 //{{AFX_DATA_INIT(CCaptureDlg) Hk]BC  
  m_bControl = FALSE; tqQ0lv^J  
  m_bAlt = FALSE; 2\w=U,;(  
  m_bShift = FALSE; 8`G{1lr4o  
  m_Path = _T("c:\\"); 30_un  
  m_Number = _T("0 picture captured."); MA+-2pMc|7  
  nCount=0; ^-IsK#r.k  
  bRegistered=FALSE; {}pqxouE  
  bTray=FALSE; kppRQ Q*[  
 //}}AFX_DATA_INIT +?iM$}8!U  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 <s-@!8*(  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); Uxemlp%%*  
} ,8I AhQa  
qP"JNswI_  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) X[Ek'=}  
{ =4e=wAO(i  
 CDialog::DoDataExchange(pDX); %EGr0R(  
 //{{AFX_DATA_MAP(CCaptureDlg) _g 4 /%  
  DDX_Control(pDX, IDC_KEY, m_Key); e(#IewKp  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); qd+[ShrhqZ  
  DDX_Check(pDX, IDC_ALT, m_bAlt); }IN_5o((  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); {TncqA  
  DDX_Text(pDX, IDC_PATH, m_Path); c,q"}nE8w  
  DDX_Text(pDX, IDC_NUMBER, m_Number); HJ qQlEq  
 //}}AFX_DATA_MAP F4rKFMr  
} sdf%  
*kQCW#y0  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ^v!im\ r  
//{{AFX_MSG_MAP(CCaptureDlg) DvX3/z#T  
 ON_WM_SYSCOMMAND() Iv(Qa6(  
 ON_WM_PAINT() )E:,V~< 8  
 ON_WM_QUERYDRAGICON() Iz )hz9k  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) P/pjy  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) y5/6nvH_6  
 ON_BN_CLICKED(ID_CHANGE, OnChange) 6!B^xm.R@  
//}}AFX_MSG_MAP (kC} ,}  
END_MESSAGE_MAP() tQ~<i %;  
~g1, !Wl  
BOOL CCaptureDlg::OnInitDialog() X B*}P  
{ m*!f%}T  
 CDialog::OnInitDialog(); 4C1FPrh  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); k=7Gr;;l=p  
 ASSERT(IDM_ABOUTBOX < 0xF000); C,r`I/;  
 CMenu* pSysMenu = GetSystemMenu(FALSE); /u)Rppu  
 if (pSysMenu != NULL) :B=8_M  
 { NGD*ce"w  
  CString strAboutMenu; Q0cY/'>4  
  strAboutMenu.LoadString(IDS_ABOUTBOX); x48'1&m  
  if (!strAboutMenu.IsEmpty()) qon{ g  
  { tKZ&1E  
   pSysMenu->AppendMenu(MF_SEPARATOR); `\jTpDV_W  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); h.V]fS  
  } s8_aL)@f  
 } :Sc8PLT  
 SetIcon(m_hIcon, TRUE); // Set big icon %)axGbZG;  
 SetIcon(m_hIcon, FALSE); // Set small icon :,kU#eZ$-  
 m_Key.SetCurSel(0); _(6`{PWY  
 RegisterHotkey(); Ud#X@xK<h  
 CMenu* pMenu=GetSystemMenu(FALSE); T^$g N|  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <jUrE[x  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); xP/OsaxN  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); sz/*w7  
 return TRUE; // return TRUE unless you set the focus to a control L}W1*L$;<  
} ku9@&W+  
nlzW.OLM  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) \2Og>{"U  
{ Xlv#=@;O]  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) -\kXH"%  
 { a jQqj.  
  CAboutDlg dlgAbout; @Y UY9+D&  
  dlgAbout.DoModal(); $J"%I$%X=  
 } I1)-,/nEjg  
 else )'5<6Q.]  
 { %X4-a%512  
  CDialog::OnSysCommand(nID, lParam); ivzAlwP  
 } v**z$5x9  
} kG1;]1tT#  
[q-;/ed  
void CCaptureDlg::OnPaint() M!gBmQZ1  
{ mz\NFC<  
 if (IsIconic()) R-pH Quu3  
 { gg-};0P-  
  CPaintDC dc(this); // device context for painting ?MC(}dF0  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); h2wN<dJCM  
  // Center icon in client rectangle \+k, :8s/  
  int cxIcon = GetSystemMetrics(SM_CXICON); r<*O  
  int cyIcon = GetSystemMetrics(SM_CYICON); l"J*)P  
  CRect rect; 6F`qi:a+  
  GetClientRect(&rect); #JA}LA"l  
  int x = (rect.Width() - cxIcon + 1) / 2; 5"JU?e59M  
  int y = (rect.Height() - cyIcon + 1) / 2; F7{R~mS;  
  // Draw the icon [ -ISR7D  
  dc.DrawIcon(x, y, m_hIcon); |2)Sd[ q  
 } dEASvD'  
 else lC#RNjDp/~  
 { TDlZ!$g(  
  CDialog::OnPaint(); e?V,fzg  
 } ~G>jw"r  
} TbLe6x  
vv+D*e&<  
HCURSOR CCaptureDlg::OnQueryDragIcon() Ly9Q}dL  
{ 3Y z]8`C  
 return (HCURSOR) m_hIcon; 5W+{U8\  
} +UxI{,L  
{A|bBg1!  
void CCaptureDlg::OnCancel() =fl%8"%N&  
{  SLkuT`*  
 if(bTray) ; XG]Q<S\  
  DeleteIcon(); BhKO_wQ?:J  
  CDialog::OnCancel(); L=,OZ9aA  
} }YQ:6I  
&=6%>  
void CCaptureDlg::OnAbout() <cYp~e%xIw  
{ &hayR_F9  
 CAboutDlg dlg; 8xgJSk  
 dlg.DoModal(); =3*Jj`AV  
} |rMq;Rgu?  
n)#Lh 7X"  
void CCaptureDlg::OnBrowse() @\)fzubu  
{ A 4j<\xL  
 CString str; nbGoJC:U  
 BROWSEINFO bi; 6xHi\L  
 char name[MAX_PATH]; :zlpfm2  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); Ah-8"`E  
 bi.hwndOwner=GetSafeHwnd(); xf/m!b"p  
 bi.pszDisplayName=name; Fn!SGX~kx$  
 bi.lpszTitle="Select folder"; ibJl;sJ  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; i\Yl  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); {I{3(M#"  
 if(idl==NULL) d$K=c1  
  return; I"1CgKYK^+  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); e*:}$u8 a  
 str.ReleaseBuffer(); {"m0)G,G  
 m_Path=str; p1D()-  
 if(str.GetAt(str.GetLength()-1)!='\\') 9? 2  
  m_Path+="\\"; 66Gx.tE  
 UpdateData(FALSE); vU!8`x)  
} :.$"kXm^  
?; [ T  
void CCaptureDlg::SaveBmp() 5`~mqqR5  
{ ?E<c[*F05  
 CDC dc; QH~Jy*\+PX  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); G>%AZr{M  
 CBitmap bm; ?*H9-2W@  
 int Width=GetSystemMetrics(SM_CXSCREEN); @9 )}cg  
 int Height=GetSystemMetrics(SM_CYSCREEN); mb\h^cKaq  
 bm.CreateCompatibleBitmap(&dc,Width,Height); txq~+'A:+  
 CDC tdc; mV?&%>*(f  
 tdc.CreateCompatibleDC(&dc); rJQ=9qn\  
 CBitmap*pOld=tdc.SelectObject(&bm); :y# T9R9  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); .x}gg\  
 tdc.SelectObject(pOld); ;,XyN+2H  
 BITMAP btm; ;/'|WLI9  
 bm.GetBitmap(&btm); =Vb~s+YW  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; q[ ULG v  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); .:y5U}vR  
 BITMAPINFOHEADER bih; ^s{hs(8%R  
 bih.biBitCount=btm.bmBitsPixel; :p>hW!~  
 bih.biClrImportant=0; Ma6W@S  
 bih.biClrUsed=0; ]p]UTCo!'  
 bih.biCompression=0; Hx %$ X  
 bih.biHeight=btm.bmHeight; 5ZK&fKeCF  
 bih.biPlanes=1; d~@q%-`lA  
 bih.biSize=sizeof(BITMAPINFOHEADER); /r^[a,Q#x  
 bih.biSizeImage=size; `T"rG }c  
 bih.biWidth=btm.bmWidth; J} TfRrf  
 bih.biXPelsPerMeter=0; `~h4D(n`  
 bih.biYPelsPerMeter=0; k_aW  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); DM),|Nq"  
 static int filecount=0; c?K~/bx.  
 CString name; 40#9]=;}  
 name.Format("pict%04d.bmp",filecount++); LA4<#KP  
 name=m_Path+name; +Ok%e.\ZM  
 BITMAPFILEHEADER bfh; 6|!NLwa  
 bfh.bfReserved1=bfh.bfReserved2=0; {38\vX,I(w  
 bfh.bfType=((WORD)('M'<< 8)|'B'); Z\? E3j  
 bfh.bfSize=54+size; aV6#t*\J  
 bfh.bfOffBits=54;  c%f_.MiU  
 CFile bf; &yIGr` ;  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ g97]Y1g  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ? \m3~6y  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); @{d\j]Nw  
  bf.WriteHuge(lpData,size); ?j{C*|yHO  
  bf.Close(); 2Y OKM #N]  
  nCount++; s_ bR]G  
 } dqc1 q:k?$  
 GlobalFreePtr(lpData); gR Nv-^  
 if(nCount==1) 8SC%O\,  
  m_Number.Format("%d picture captured.",nCount); "aq'R(/`c  
 else p&N#_dmlH  
  m_Number.Format("%d pictures captured.",nCount); oyx^a9  
  UpdateData(FALSE); E m{aM  
} XOy2lJ/  
w%a8XnW]1  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) GABQUmtH  
{ PJLR<9  
 if(pMsg -> message == WM_KEYDOWN) ]@ M5_%p  
 { Yr+23Ro  
  if(pMsg -> wParam == VK_ESCAPE) 7G9 3,dJ  
   return TRUE; j9R6ta3\l  
  if(pMsg -> wParam == VK_RETURN) `tEo]p  
   return TRUE; md bp8,O  
 } xT*d/Oaw  
 return CDialog::PreTranslateMessage(pMsg);  jz'<  
} g(hOg~S\E  
'#\1uXM1U?  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 'g)n1 {  
{ U|@V 74  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ h7yqk4'Lq  
  SaveBmp(); Ev9 >@~^  
  return FALSE; $ uh z  
} OCV+h'  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ l7}g^\I  
 CMenu pop; K@u&(}  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m:+8J,jW  
 CMenu*pMenu=pop.GetSubMenu(0); gfa[4 z  
 pMenu->SetDefaultItem(ID_EXITICON); `BY&>WY[  
 CPoint pt; uQqWew8l+  
 GetCursorPos(&pt); Pbu{'y3J  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); v?:: |{  
 if(id==ID_EXITICON) kH948<fk3  
  DeleteIcon(); 9X}I>  
 else if(id==ID_EXIT) G"dS+,Q  
  OnCancel(); J CGC  
 return FALSE; Y&.UIosWb  
} {b)~V3rsY  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); ZcE_f>KV  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Vb|#MNf)  
 AddIcon(); ZC0-wr \  
 return res; g"_C,XN  
} <skajQQ  
l$xxrb9P!  
void CCaptureDlg::AddIcon() d_z 59  
{ 3=0E!e  
 NOTIFYICONDATA data; K^l:MxO-X  
 data.cbSize=sizeof(NOTIFYICONDATA); Ms^dRe)  
 CString tip; mpw~hW0-  
 tip.LoadString(IDS_ICONTIP); ZWUP^V  
 data.hIcon=GetIcon(0); 3gZ8.8q3  
 data.hWnd=GetSafeHwnd(); 3_$w| ET  
 strcpy(data.szTip,tip); jXg  
 data.uCallbackMessage=IDM_SHELL; BJ}D%nm}  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; RFaSwf,5n  
 data.uID=98; f9u^R=Ff[  
 Shell_NotifyIcon(NIM_ADD,&data); XGrue6 ya  
 ShowWindow(SW_HIDE); 23\RJpKb  
 bTray=TRUE; 0&+k.Vg  
} 9xI GV!  
zYER  
void CCaptureDlg::DeleteIcon() lSwcL  
{ ,:Z^$  
 NOTIFYICONDATA data; O[^%{'  
 data.cbSize=sizeof(NOTIFYICONDATA); oqd;6[%G  
 data.hWnd=GetSafeHwnd(); _qwQ;!9  
 data.uID=98; ;,h/   
 Shell_NotifyIcon(NIM_DELETE,&data); Kv&g5&N,  
 ShowWindow(SW_SHOW); YIRZ+H<Q  
 SetForegroundWindow(); (N-RIk73/O  
 ShowWindow(SW_SHOWNORMAL); =uHnRY  
 bTray=FALSE; }yn0IWVa  
} kRJ4-n^@><  
'9p@vi{\  
void CCaptureDlg::OnChange() eV^d6T$  
{ "r4AY  
 RegisterHotkey(); N2r/ho}8  
} uN*KHE+h  
;bzX% f?|G  
BOOL CCaptureDlg::RegisterHotkey() F9"w6;hh  
{ y&~w2{a  
 UpdateData(); Vv.r8IGYm  
 UCHAR mask=0; z;tI D~Y  
 UCHAR key=0; )-15 N  
 if(m_bControl) =W bOwI)u  
  mask|=4; Bq\F?zk<  
 if(m_bAlt) p9!"O  
  mask|=2; Jzji&A~  
 if(m_bShift) f"[J "j8  
  mask|=1; *D}0 [|O  
  key=Key_Table[m_Key.GetCurSel()]; K7knK  
 if(bRegistered){  fE f_F r  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); $``1PJoi  
  bRegistered=FALSE; !LMN[3M_  
 } +j_ ;(Gw7  
 cMask=mask; |y;}zQB-dH  
 cKey=key; )> ,wj  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  5^<h}u9  
 return bRegistered; \uqjs+  
} tsOrt3   
MB^~%uZ2K  
  四、小结 C&LBr|  
+Mewo  
  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。
评价一下你浏览此帖子的感受

精彩

感动

搞笑

开心

愤怒

无聊

灌水
描述
快速回复

您目前还是游客,请 登录注册
温馨提示:欢迎交流讨论,请勿纯表情、纯引用!
认证码:
验证问题:
10+5=?,请输入中文答案:十五