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
  • 5559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: 4MtRI  
  P_75-0G  
  一、实现方法 lLglF4  
GxC\Nj#  
  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: raU_Z[  
"QD>:G;u  
#pragma data_seg("shareddata") S;%k?O 7v  
HHOOK hHook =NULL; //钩子句柄 @l5GBsLK  
UINT nHookCount =0; //挂接的程序数目 t%f>*}*P*  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 JLjs`oq h  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 @,]W  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey }nO%q6|\V  
static int KeyCount =0; ]v]:8>N  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 aYWUwYB$  
#pragma data_seg() wqJl[~O$  
pEX Q  
  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。 1&9w]\Ae7l  
wByTNA7  
  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: V-X Ty iv  
pqju@FD *  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR D>Rlm,U  
cKey,UCHAR cMask) ,^eOwWV  
{ U%;E:|  
 BOOL bAdded=FALSE; A* Pz-z>z  
 for(int index=0;index<MAX_KEY;index++){ >*n4j:  
  if(hCallWnd[index]==0){ EV-# E  
   hCallWnd[index]=hWnd; [8oX[oP  
   HotKey[index]=cKey; wL6G&6]</W  
   HotKeyMask[index]=cMask; ;ZP!:,  
   bAdded=TRUE; , E$f"  
   KeyCount++; "s(|pQh;  
   break; ~lqNWL^l  
  } kr!>rqN5  
 } N3oa!PE  
 return bAdded; av:%wJUl,$  
} hFhC&2HN  
//删除热键 [kqO6U  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) hPCSAo!|  
{ #MiO4zXgd  
 BOOL bRemoved=FALSE; 8+32hg@^F  
 for(int index=0;index<MAX_KEY;index++){ }ov>b2H#<  
  if(hCallWnd[index]==hWnd){ y6MkaHW[m  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ B+pLW/4l  
    hCallWnd[index]=NULL; 'UZ i>Ta  
    HotKey[index]=0; $*Wa A`(U  
    HotKeyMask[index]=0; B[+b%a3  
    bRemoved=TRUE; u^WZsW  
    KeyCount--; _x,(576~  
    break; /ZH*t\  
   } NJOV!\k  
  } 8E9k7  
 } CoWT  
 return bRemoved; JRAU|gr  
} 4E1j0ARQQ  
F5M|QX@-  
9F~5Ht  
  DLL中的钩子函数如下: ejbtdU8N<  
!X-ThKEq  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) eiRVw5g  
{ %/hokyx  
 BOOL bProcessed=FALSE; cHVu6I?h  
 if(HC_ACTION==nCode) E33x)CP  
 { mmCGIX  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 lTtc#  
   switch(wParam) C+mPl+}w  
   {  mD*!<<Sw  
    case VK_MENU: $v"CQD  
     MaskBits&=~ALTBIT; HL:w*8a  
     break; 5-S-r9  
    case VK_CONTROL: `FX?P`\@I  
     MaskBits&=~CTRLBIT; -Hy> z  
     break; *e<'|Kq  
    case VK_SHIFT: %>y!N!.F  
     MaskBits&=~SHIFTBIT; ]@ Vp:RGMr  
     break; Y$+v "  
    default: //judge the key and send message wWq-zGH|&  
     break; L},o;p:  
   } + EKp*Vje  
   for(int index=0;index<MAX_KEY;index++){ LJt5?zQKrW  
    if(hCallWnd[index]==NULL) ,">CPl]  
     continue; }wEt=zOJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) gI@nE:(m  
    { NL!xk cXO  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); s9fEx -!y  
     bProcessed=TRUE; ;$qc@)Uwp  
    } AU9:Gu@M/  
   } [d>2F  
  } H$ :BJ$x@  
  else if((lParam&0xc000ffff)==1){ //有键按下 (dV7N  
   switch(wParam) Z0wH%o\  
   { T/J1 b-  
    case VK_MENU: H;Gs0Qi;  
     MaskBits|=ALTBIT;  Lu[Hz8  
     break; v^[!NygShs  
    case VK_CONTROL: WW7E*kc  
     MaskBits|=CTRLBIT; oB '5':  
     break; th0>u.hJ  
    case VK_SHIFT: ~uB@oKMru  
     MaskBits|=SHIFTBIT; \rS-}DG  
     break; eQqCRXx  
    default: //judge the key and send message h_g "F@  
     break; z@jKzyq  
   } 7&L8zl|K  
   for(int index=0;index<MAX_KEY;index++){ >Tn[CgH]7  
    if(hCallWnd[index]==NULL) KQ(S\  
     continue; B>cx[.#!  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) -:b<~S[  
    { = Fq{#sC>  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); 4r7a ZDVA\  
     bProcessed=TRUE; 8. %g&% S  
    } u(ETc* D]  
   } `1FNs?j  
  } yV&]i-ey  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 NxFCVqGb  
   for(int index=0;index<MAX_KEY;index++){ qa6HwlC1  
    if(hCallWnd[index]==NULL) V {}TG]  
     continue; F0kQ/x  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) gDX\ p>7  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); >9<rc[  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 XqcNFSo)  
   } 1D~B\=LL}  
  } 'w|N} 4  
 } y35e3  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); CdtwR0  
} q s9r$o.\l  
~BBh4t&  
  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: V9  EC@)  
NpA%7Q~B$,  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); NpGz y`&b  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 5iGz*_ m  
D{4]c)>  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: Y`xAJ#= ,i  
i}))6   
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) _e|-O>#pl  
{ &Mz.i,Gh  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /[q_f  
 { sq8O+AWl  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 h{?f uoZj%  
  SaveBmp(); 4k6:   
  return FALSE; H;FzWcm  
 } P1`YbLER5  
 …… //其它处理及默认处理 F-Ku0z]){?  
} eNm Wul  
| Y(  
,%y!F3m  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 Jf@Xz7{z  
q+lCA#Sx  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 =Q!V6+}nY^  
2k`Q+[?{q>  
  二、编程步骤 j?! /#'  
8,B#W#*{  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; G/KTF2wl7  
~BXy)IB6  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; 2nSz0 .  
@,pn/[  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; 6(q8y(.`  
fs#9*<]m  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; U8zs=tA  
@ZcI]G%  
  5、 添加代码,编译运行程序。 !zfV (&  
j<L!(6B  
三、程序代码 JS&;7Z$KX  
1_G+sDw$  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL VB4ir\nF  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) t & 5s.  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ h>/L4j*Z  
#if _MSC_VER > 1000 4HGR-S/  
#pragma once RRGs:h@;  
#endif // _MSC_VER > 1000  w4UJXc  
#ifndef __AFXWIN_H__ !nF.whq  
#error include 'stdafx.h' before including this file for PCH q6P5:@  
#endif W{kTM4  
#include "resource.h" // main symbols !@ )JqF.  
class CHookApp : public CWinApp 3 gW+|3E  
{ )fc+B_  
 public: ;^8X(R  
  CHookApp(); ,B,0o*qc{K  
  // Overrides <!?ZH"F0  
  // ClassWizard generated virtual function overrides  t&G #%  
  //{{AFX_VIRTUAL(CHookApp) 1kh()IrA  
 public: Acb %)Y  
  virtual BOOL InitInstance(); OX.g~M ig|  
  virtual int ExitInstance(); 4uv*F:eo  
  //}}AFX_VIRTUAL 74KR.ABd  
  //{{AFX_MSG(CHookApp) Z%VgAV>>  
  // NOTE - the ClassWizard will add and remove member functions here. s>ZlW:jY  
  // DO NOT EDIT what you see in these blocks of generated code ! XeAH.i<  
  //}}AFX_MSG KhyGz"I!@$  
  DECLARE_MESSAGE_MAP() W!a'KI'  
}; q9(hn_X@/  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 1_)Y{3L  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); qK&h$;~*y  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); ^O3p:X4u  
BOOL InitHotkey(); ,{#Li  
BOOL UnInit(); -.UUa  
#endif H$xUOqL  
=K9-  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. MAgoxq~;V  
#include "stdafx.h" -qB{TA-.\  
#include "hook.h" K- TLzoYA  
#include <windowsx.h> 3MHByT %  
#ifdef _DEBUG R=L-Ulhk  
#define new DEBUG_NEW h{e?Fl  
#undef THIS_FILE twql)lbx  
static char THIS_FILE[] = __FILE__; ZV~9{E8  
#endif d-#yN:}0  
#define MAX_KEY 100 s&-dLkis{u  
#define CTRLBIT 0x04 VCUsvhI  
#define ALTBIT 0x02 N<aMUVm  
#define SHIFTBIT 0x01 FC8#XZp  
#pragma data_seg("shareddata") Odbm"Y  
HHOOK hHook =NULL; zUJPINDb  
UINT nHookCount =0; D(">bR)1  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey l>@){zxL  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT j.29nJ  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey ;QQ/bM&I  
static int KeyCount =0; sW@_q8lG  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift xGK"`\V  
#pragma data_seg() >]?!9@#IH  
HINSTANCE hins; ~4ysg[`  
void VerifyWindow(); sq}uq![?M  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) ]hY4 MS  
//{{AFX_MSG_MAP(CHookApp) WNiM&iU  
// NOTE - the ClassWizard will add and remove mapping macros here. oMF[<Xf  
// DO NOT EDIT what you see in these blocks of generated code! PkDh[i9Z|  
//}}AFX_MSG_MAP  5f_1 dn  
END_MESSAGE_MAP() ]"U/3dL5  
":01M},RA  
CHookApp::CHookApp() Y r 1k\q  
{ 3xpygx9  
 // TODO: add construction code here, WI\h@qSB  
 // Place all significant initialization in InitInstance tL S$D-  
} w#RfD  
Dmn{ppfyb  
CHookApp theApp; ]{pH,vk-  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 7^Y`'~Y^  
{ ?xzDz  
 BOOL bProcessed=FALSE; NE-c[|rq  
 if(HC_ACTION==nCode) 1tFx Z#(G  
 { 6Vy4]jdT5  
  if((lParam&0xc0000000)==0xc0000000){// Key up w)%/Me3o  
   switch(wParam) wL" 2Cm  
   { a O(&<  
    case VK_MENU: Zs}EGC~&  
     MaskBits&=~ALTBIT; E>`gj~  
     break; X5o{d4R L  
    case VK_CONTROL: Q Pp>%iE@  
     MaskBits&=~CTRLBIT; J"yq)0  
     break; C'fQ Z,r-v  
    case VK_SHIFT: +ZPn[|  
     MaskBits&=~SHIFTBIT; `:EU~4s\  
     break; 3b1%^@,ACy  
    default: //judge the key and send message "$N 4S9U  
     break; t3;QF  
   } Hp-vBoEk  
   for(int index=0;index<MAX_KEY;index++){ hrTl:\  
    if(hCallWnd[index]==NULL) tcj3x<  
     continue; ~X1<x4P\  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ^h"F\vIpV  
    { 8DZ OPA  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8jfEvwY  
     bProcessed=TRUE; "AHuq%j  
    } 7>yb8/J  
   } ? -`8w _3  
  } &%`0&y  
  else if((lParam&0xc000ffff)==1){ //Key down m7m)BX%O  
   switch(wParam) p"=8{LrO  
   { T+)#Du  
    case VK_MENU: 9l:vVp7Uk  
     MaskBits|=ALTBIT; NC{8[*Kx5  
     break; yI_MY L[  
    case VK_CONTROL: SSa0 x9T  
     MaskBits|=CTRLBIT; @7OE:& #V  
     break; EY'48S  
    case VK_SHIFT: ak]H|D" 9  
     MaskBits|=SHIFTBIT; g 9:V00^<  
     break; "0Yb 2>F  
    default: //judge the key and send message 'n!kqP  
     break; 9Gk#2  
   } (c1Kg   
   for(int index=0;index<MAX_KEY;index++) I8{ohFFo  
   { hwd{^  
    if(hCallWnd[index]==NULL) a3[lZPQe  
     continue; T6Ks]6m_  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) 8WMGuv  
    { ue"e><c6:  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); vB1nj<]&z  
     bProcessed=TRUE; xY1@Ja  
    } _gI1@uQw  
   } 3B[u2o>  
  } ;$rh&ET  
  if(!bProcessed){ be:=-B7!  
   for(int index=0;index<MAX_KEY;index++){ )dZ1$MC[  
    if(hCallWnd[index]==NULL) tz`T#9  
     continue; }}w Z  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) qJT|om L Y  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); -)Y[t Z^*`  
   } #EX NSr  
  } yU< "tgE  
 } v!%VH?cA8  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); #kPsg9Y  
} =!P$[pN2  
@1iH4RE*  
BOOL InitHotkey() O*+,KKPt  
{ @RFJe$%  
 if(hHook!=NULL){ u13v@<HGc  
  nHookCount++; _$BH.I  
  return TRUE; 5WU ? Km  
 } geEETb} +y  
 else $' >|r]  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);  Ts 1  
  if(hHook!=NULL) WS1$cAD2N  
   nHookCount++; x$/: %"E  
  return (hHook!=NULL); 4dI =  
} C9"yu&l  
BOOL UnInit() ()%;s2>F  
{ &(,-:"{pNR  
 if(nHookCount>1){ E8PlGQ~z{d  
  nHookCount--; xzOM\Nq?O  
  return TRUE; g%T`6dvT  
 } c-bTf$6}  
 BOOL unhooked = UnhookWindowsHookEx(hHook); so@wUxF  
 if(unhooked==TRUE){ /H<tv5mX J  
  nHookCount=0; F@Cxjz  
  hHook=NULL; "IKbb7x  
 } l\1_v7s  
 return unhooked; &1,{.:@e  
} WiCJhVF3  
Q'K[?W|C  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) (ixlFGvEq  
{ _Q6` Wp6m  
 BOOL bAdded=FALSE; b<"LUM*;  
 for(int index=0;index<MAX_KEY;index++){ <-Q0s%mNj,  
  if(hCallWnd[index]==0){ [gxH,=Pb  
   hCallWnd[index]=hWnd; N"&qy3F  
   HotKey[index]=cKey; 6V6,m4e  
   HotKeyMask[index]=cMask; OysO55i  
   bAdded=TRUE; >'|Wrz67Z  
   KeyCount++; 1n|K   
   break; ?emYLw  
  } S# sar}-I  
 } Sx}61?  
 return bAdded;  NncII5z  
} 7) 37AKw  
g RBbL1  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) u<K{=94!e  
{ 6`U]%qx_I  
 BOOL bRemoved=FALSE; 8u4FagQ,  
 for(int index=0;index<MAX_KEY;index++){ b 3i34,  
  if(hCallWnd[index]==hWnd){ G>w+J'7  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ Xwt}WSdF`k  
    hCallWnd[index]=NULL; Vf] ;hm  
    HotKey[index]=0; 9>hK4&m^  
    HotKeyMask[index]=0; TxXX}6  
    bRemoved=TRUE; i :Sih"=  
    KeyCount--; .YxcXe3#  
    break; P1A5Qq  
   } C!s !j  
  } {;E]#=|  
 } J^)=8cy  
 return bRemoved; "=vH,_"Ql  
} ^mu PjM+D  
r>3y87  
void VerifyWindow() ]gG&X3jaKq  
{ (H-}z`sy/@  
 for(int i=0;i<MAX_KEY;i++){ ~e#QAaXD#5  
  if(hCallWnd!=NULL){ Q]<6i  
   if(!IsWindow(hCallWnd)){ "6zf-++%  
    hCallWnd=NULL; ry!0~ir  
    HotKey=0; r0/o{Y|l6  
    HotKeyMask=0; o%.0@W  
    KeyCount--; YH/3N(],  
   } y(h"0A1lW  
  } yy#4DYht  
 } APM!xX=N  
} 2}jC%jR2  
xI(Y}>  
BOOL CHookApp::InitInstance() Yo;Mexo!  
{ S^*ME*DDz  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); @w{"6xc%a  
 hins=AfxGetInstanceHandle(); (7J (.EG2e  
 InitHotkey(); ypV>*  
 return CWinApp::InitInstance(); '7(oCab"_  
} *nc9 u"  
$KMxq=  
int CHookApp::ExitInstance() 6h3TU,$r  
{ fs;pX/:FR  
 VerifyWindow(); u RPvo}!=1  
 UnInit(); %% A==_b  
 return CWinApp::ExitInstance(); *e}1KcJ  
} -G@:uxB  
_rjB.  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file X>kW)c4{b  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) d gRTV<vM  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ o=ULo &9  
#if _MSC_VER > 1000 I!;vy/r  
#pragma once YqNI:znm-  
#endif // _MSC_VER > 1000 5BsfbLKC  
T f;:C]  
class CCaptureDlg : public CDialog 3}25=%;[  
{ n+%tu"e  
 // Construction +#MQ8d  
 public: fZF.eRP '  
  BOOL bTray; Kb,#Ot  
  BOOL bRegistered; G0&'B6I>  
  BOOL RegisterHotkey(); Zq\Vq:MX  
  UCHAR cKey; Q3|I.I e  
  UCHAR cMask; z)0%gd|  
  void DeleteIcon(); $mLiEsJ  
  void AddIcon(); v7@O ,%  
  UINT nCount; @1^:V-=  
  void SaveBmp(); IM$I=5y e  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor C3GI?| b  
  // Dialog Data }j6<S-s~  
  //{{AFX_DATA(CCaptureDlg) 6Z7J<0  
  enum { IDD = IDD_CAPTURE_DIALOG }; vQhi2J'  
  CComboBox m_Key; 2E_*'RT  
  BOOL m_bControl; fgEMn;  
  BOOL m_bAlt; ;/|3U7{c  
  BOOL m_bShift; >C"QV `+  
  CString m_Path; /{HK0fd  
  CString m_Number; ):pFI/iC  
  //}}AFX_DATA V07? sc<  
  // ClassWizard generated virtual function overrides 1H]E:Bq  
  //{{AFX_VIRTUAL(CCaptureDlg) B#Z-kFn@  
 public: ]n$&|@  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 9_I#{ ?  
 protected: QLum=YB  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support ![CF >:e  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); ! tPHT  
  //}}AFX_VIRTUAL o dTg.m  
  // Implementation \r7gubD  
 protected: ``* !b >)  
  HICON m_hIcon; -e(,>9Q  
  // Generated message map functions /!HFi>   
  //{{AFX_MSG(CCaptureDlg) 4,P!D3SH  
  virtual BOOL OnInitDialog(); StWF66u34&  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 6kM'f}t[C  
  afx_msg void OnPaint(); ;gmfWHB<  
  afx_msg HCURSOR OnQueryDragIcon(); y_A?} 'X  
  virtual void OnCancel(); c3G&)gU4q  
  afx_msg void OnAbout(); ?2$0aq  
  afx_msg void OnBrowse();  Im8c  
  afx_msg void OnChange(); `.F+T)G  
 //}}AFX_MSG SdOE^_@:  
 DECLARE_MESSAGE_MAP() U)y~{E~c34  
}; ?)V}_%fVv  
#endif yNk E>  
kFsq23Ne  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file U**v'%{s  
#include "stdafx.h" B@@j-  
#include "Capture.h" Th(F^W9  
#include "CaptureDlg.h" Eh*t;J=O  
#include <windowsx.h> W99Hq1W;r  
#pragma comment(lib,"hook.lib") <;.->73E  
#ifdef _DEBUG PZsq9;P$  
#define new DEBUG_NEW I7/X6^/}  
#undef THIS_FILE /'g"Ys?3  
static char THIS_FILE[] = __FILE__; UZ}>@0  
#endif UOtrq=y  
#define IDM_SHELL WM_USER+1 {%Ujp9i  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); I'%(f@u~  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Q1(6U6L  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Vuu_Sd  
class CAboutDlg : public CDialog 5xF R7%_&  
{ 'YUx&F cM  
 public: sM8AORd  
  CAboutDlg(); k9iXVYQ.;r  
  // Dialog Data baL-~`(T  
  //{{AFX_DATA(CAboutDlg)  e+=IGYC  
  enum { IDD = IDD_ABOUTBOX }; "=r"c$xou  
  //}}AFX_DATA y$^.HI02jP  
  // ClassWizard generated virtual function overrides OP}8u"\Z  
  //{{AFX_VIRTUAL(CAboutDlg) *S$`/X  
 protected: ;UB$Uqs6  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support }4M4D/=  
  //}}AFX_VIRTUAL j*05!j<'  
  // Implementation 8NS1*\z  
 protected: v'zj<|2  
  //{{AFX_MSG(CAboutDlg) 2E X Rq  
  //}}AFX_MSG WCPl}7>  
  DECLARE_MESSAGE_MAP() aA/.EAc7  
}; SXI3y  
LUjev\Re  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 999E0A$dkv  
{ F6h|AF|"  
 //{{AFX_DATA_INIT(CAboutDlg) ;r}>1LhN  
 //}}AFX_DATA_INIT 3x{2Dhi  
} FTfejk!  
H D95>%  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) _2C[F~ +l  
{ 2AZ)|dM'`  
 CDialog::DoDataExchange(pDX); V*U*_Y  
 //{{AFX_DATA_MAP(CAboutDlg) :*wjC.Z  
 //}}AFX_DATA_MAP u/2!v(  
} ;uazQyo6  
t%f6P  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) wWNHZ v&  
 //{{AFX_MSG_MAP(CAboutDlg) |,wp@)e6h  
 // No message handlers 0 w#[?.  
 //}}AFX_MSG_MAP 30Z RKrW"~  
END_MESSAGE_MAP() 8Qg,UX  
)|@ H#kv?  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) #=hI}%n  
: CDialog(CCaptureDlg::IDD, pParent) @]0;aZ{3  
{ B "z`X!\  
 //{{AFX_DATA_INIT(CCaptureDlg) T]fu[yRVvg  
  m_bControl = FALSE; dq{wFI)  
  m_bAlt = FALSE; AqzPwO^  
  m_bShift = FALSE; }`,}e259  
  m_Path = _T("c:\\"); oIP<7gz  
  m_Number = _T("0 picture captured."); Lz9t9AoB  
  nCount=0; Q< q&a8~  
  bRegistered=FALSE; "x*5g*k  
  bTray=FALSE; oT\u^WU  
 //}}AFX_DATA_INIT -b4#/q+bb+  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 LJ|2=lI+jb  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); AShnCL8uR  
} a|x1aN 0  
!L#>wlX)  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 1*"t-+|  
{ DGwN*>X  
 CDialog::DoDataExchange(pDX); u(s/4Lu  
 //{{AFX_DATA_MAP(CCaptureDlg) :OVre*j  
  DDX_Control(pDX, IDC_KEY, m_Key); =a<};X  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); &l=%*`On  
  DDX_Check(pDX, IDC_ALT, m_bAlt); M=hH:[6 &  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); '>]9efJA  
  DDX_Text(pDX, IDC_PATH, m_Path); y2U^7VrO  
  DDX_Text(pDX, IDC_NUMBER, m_Number); wf<=r W'  
 //}}AFX_DATA_MAP rK%A=Q  
} ZO2$Aan  
cv b:FK  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) {5=Iu\e  
//{{AFX_MSG_MAP(CCaptureDlg) eL-9fld /n  
 ON_WM_SYSCOMMAND() 65ctxxWv1  
 ON_WM_PAINT() 9aR-kcvJIJ  
 ON_WM_QUERYDRAGICON() 9$z|kwU  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) E,[@jxP  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) G' ~Z'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) mOb*VH  
//}}AFX_MSG_MAP =Kv*M@  
END_MESSAGE_MAP() PSO9{!  
>h0iq  
BOOL CCaptureDlg::OnInitDialog() R`wL%I!?f  
{ 6_m5%c~;+r  
 CDialog::OnInitDialog(); \tj7Jy  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); &;%z1b> F  
 ASSERT(IDM_ABOUTBOX < 0xF000); o 26R]  
 CMenu* pSysMenu = GetSystemMenu(FALSE); 0Jh^((i*  
 if (pSysMenu != NULL) L* Mt/  
 { :D>afC8,  
  CString strAboutMenu; (hB&OP5Fne  
  strAboutMenu.LoadString(IDS_ABOUTBOX); 9U_uw Rv2  
  if (!strAboutMenu.IsEmpty()) 2Qqk?;^ 1  
  { }hralef #N  
   pSysMenu->AppendMenu(MF_SEPARATOR); UvSvgDMl  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )")_aA  
  } Awo H d7M  
 } (6R^/*-o  
 SetIcon(m_hIcon, TRUE); // Set big icon @hlT7C)xK  
 SetIcon(m_hIcon, FALSE); // Set small icon |&+0Tg~ZE  
 m_Key.SetCurSel(0); Fq6sl}b(On  
 RegisterHotkey(); Tl^9!>\Q  
 CMenu* pMenu=GetSystemMenu(FALSE); @O/Jy2>3H  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); =kz(1Pb  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); "F(LTppy  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i(^&ZmG  
 return TRUE; // return TRUE unless you set the focus to a control kCXQHX  
} I+,~pmn:  
v`"z  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) &@O]'  
{ [X'XxYbZ  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) /Q4TQ\:  
 { (j^Qa~{mG4  
  CAboutDlg dlgAbout; 4aAuE0  
  dlgAbout.DoModal(); d`he Wv^/`  
 } Jhclg0q  
 else M^c`j#NQ  
 { U{vt9t  
  CDialog::OnSysCommand(nID, lParam); g]IRv(gDh  
 } v=A ]#O%  
} '~HCYE:5  
7~@9=e8G  
void CCaptureDlg::OnPaint() ?MT V!i0  
{ O,`#h*{N  
 if (IsIconic()) 9E/{HNkf  
 { B? $9M9  
  CPaintDC dc(this); // device context for painting w-%V9]J1  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); $4^cbk  
  // Center icon in client rectangle =IQ+9Fl2  
  int cxIcon = GetSystemMetrics(SM_CXICON); q6 h'=By  
  int cyIcon = GetSystemMetrics(SM_CYICON); "@1e0`n Q  
  CRect rect; P|> fO'  
  GetClientRect(&rect); Yv?nw-HM  
  int x = (rect.Width() - cxIcon + 1) / 2; !}Sf?n P#  
  int y = (rect.Height() - cyIcon + 1) / 2; 9`P<|(  
  // Draw the icon Gkz\By  
  dc.DrawIcon(x, y, m_hIcon); >h^CC*&'pw  
 }  L|hdV\  
 else H ?Vo#/  
 { F-L!o8o  
  CDialog::OnPaint(); I}djDtJ  
 } SV2DvrIR  
} +gZg7]!Z  
{tUjUwhz(  
HCURSOR CCaptureDlg::OnQueryDragIcon() 8$k`bZ  
{ _l`d+ \#  
 return (HCURSOR) m_hIcon; EwvW: t1  
} 4~mYj@lvd  
WmO.&zp  
void CCaptureDlg::OnCancel() )-D{]>8  
{ C` s  
 if(bTray) ; B4x>  
  DeleteIcon(); $#3O:aW  
  CDialog::OnCancel(); {}r#s>  
} : GVyY]qBU  
:fo.9J  
void CCaptureDlg::OnAbout() ,$i2vGd  
{ zX{O"w  
 CAboutDlg dlg; SG:Fn8  
 dlg.DoModal(); 0(!j]w"r3  
} K`7(*!HEb  
4+rr3 $AY  
void CCaptureDlg::OnBrowse() bXVH7Fy  
{ /.54r/FN')  
 CString str; z_Em%X  
 BROWSEINFO bi; LA!2!60R  
 char name[MAX_PATH]; !i >&z?  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); 4R 9lA  
 bi.hwndOwner=GetSafeHwnd(); `/ W6, ]  
 bi.pszDisplayName=name; v|IPus|>  
 bi.lpszTitle="Select folder"; _Xs(3V@'}  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; Q"o* \I  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); Z>0a?=1[  
 if(idl==NULL) |;~kHc$W  
  return; <SK%W=  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 5 )tDgm  
 str.ReleaseBuffer(); >3{#S:  
 m_Path=str; I4[sf  
 if(str.GetAt(str.GetLength()-1)!='\\') ]q#w97BxiJ  
  m_Path+="\\"; ~ IPel  
 UpdateData(FALSE); iLQFce7d|&  
} ]i$ <<u  
0:NCIsIm<  
void CCaptureDlg::SaveBmp() 5k%Gj T  
{ U/hf?T;  
 CDC dc; ~.FeLWP  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); OvL@@SX |  
 CBitmap bm; 9T`$gAI  
 int Width=GetSystemMetrics(SM_CXSCREEN); 9%+Nzo(Fd  
 int Height=GetSystemMetrics(SM_CYSCREEN); D<V[:~-o  
 bm.CreateCompatibleBitmap(&dc,Width,Height); Y^Of  
 CDC tdc; ~3f`=r3/.  
 tdc.CreateCompatibleDC(&dc);  fP+RuZ  
 CBitmap*pOld=tdc.SelectObject(&bm); 4b\R@Knu  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); 6wIo95`  
 tdc.SelectObject(pOld); ]2:w?+T  
 BITMAP btm; UweXz.x7  
 bm.GetBitmap(&btm); (d9G`  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; 54X=58Q  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ;k W+  
 BITMAPINFOHEADER bih; {RG4m{#9  
 bih.biBitCount=btm.bmBitsPixel; v'0WE  
 bih.biClrImportant=0; sBN"eHg  
 bih.biClrUsed=0; QcW6o,  
 bih.biCompression=0; , %8keGhl  
 bih.biHeight=btm.bmHeight; LS"_-4I}  
 bih.biPlanes=1; s5`CV$bz  
 bih.biSize=sizeof(BITMAPINFOHEADER); @ Sq =q=S  
 bih.biSizeImage=size; prIPPeMdz  
 bih.biWidth=btm.bmWidth; a ~  
 bih.biXPelsPerMeter=0; !?AgAsSmc  
 bih.biYPelsPerMeter=0; V-1H(wRu  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 5|nT5oS  
 static int filecount=0; 4q9+a7@  
 CString name; Yz%AKp  
 name.Format("pict%04d.bmp",filecount++); c0 I;8z`b  
 name=m_Path+name; %S`ygc}|  
 BITMAPFILEHEADER bfh; hg2a,EU\Z  
 bfh.bfReserved1=bfh.bfReserved2=0; U z*7J  
 bfh.bfType=((WORD)('M'<< 8)|'B'); MNuBZnO  
 bfh.bfSize=54+size; `_MRf[Z}  
 bfh.bfOffBits=54; 3I"xuKxc  
 CFile bf; 3np |\i  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ _Wb3,E a=  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 5L?_AUL  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); %`]&c)&#Z  
  bf.WriteHuge(lpData,size); G+_Q7-o&d6  
  bf.Close(); g!QX#_~Il  
  nCount++; [Re.sX}$Y  
 } _nUvDdEs,  
 GlobalFreePtr(lpData); `@_j Do  
 if(nCount==1) %qycxEVP  
  m_Number.Format("%d picture captured.",nCount); i?HN  
 else {wp~  
  m_Number.Format("%d pictures captured.",nCount); +hIC N,8!  
  UpdateData(FALSE); !#NGGIp;  
} MD4RSl<F  
h^B~Fv>~  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ]QJ N` ;b0  
{ ydZS^BqG  
 if(pMsg -> message == WM_KEYDOWN) M~?2g.o'D  
 { |8{c|Qz  
  if(pMsg -> wParam == VK_ESCAPE) U } K]W>Z  
   return TRUE; G?,b51"  
  if(pMsg -> wParam == VK_RETURN) <MQTOz oj  
   return TRUE; JEL.*[/  
 } >s%&t[r6  
 return CDialog::PreTranslateMessage(pMsg); 6_=t~9sY  
} B4#XQ-  
P&sn IJ  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) dED&-e#  
{ vY"i^a`f  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 'NAC4to;;  
  SaveBmp(); (drDC1\  
  return FALSE; EGL7z`nt  
} MnPk+eNJm  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ yq=rv$.s  
 CMenu pop; |34M.YjA  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5/E7@h ,  
 CMenu*pMenu=pop.GetSubMenu(0); 2lu AF2  
 pMenu->SetDefaultItem(ID_EXITICON); )N'-A p$g  
 CPoint pt; n>XfXt =  
 GetCursorPos(&pt); *SmR|Qy  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); XU*4MU^'  
 if(id==ID_EXITICON) eZ G#op  
  DeleteIcon();  Z,"f2UJ  
 else if(id==ID_EXIT) #dj,=^1_14  
  OnCancel(); d69synEw>k  
 return FALSE; z+5%.^Re  
} Gbwq rH+  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); PAy/"R9DT-  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Dk^T_7{  
 AddIcon(); AxAbU7m  
 return res; %E"dha JY  
} PR2;+i3  
)JXlPU  
void CCaptureDlg::AddIcon() c}G\F$  
{ =M],5<2;  
 NOTIFYICONDATA data; >(\Z-I&YQ  
 data.cbSize=sizeof(NOTIFYICONDATA); ]kir@NMv>  
 CString tip; >Tp`Kri  
 tip.LoadString(IDS_ICONTIP); 2[X\*"MQ2  
 data.hIcon=GetIcon(0); G_E \p%L>]  
 data.hWnd=GetSafeHwnd(); "nA~/t=  
 strcpy(data.szTip,tip); kQ99{l H,5  
 data.uCallbackMessage=IDM_SHELL; OnND(YiX  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; cna/?V  
 data.uID=98; 8#ZF<B Y  
 Shell_NotifyIcon(NIM_ADD,&data); `gX$N1(  
 ShowWindow(SW_HIDE); nrM_ay  
 bTray=TRUE; %0_}usrsk  
}  nJ|M  
K 9tr Iy$v  
void CCaptureDlg::DeleteIcon() VUUE2k;^  
{ o^3X5})sv  
 NOTIFYICONDATA data; v/GZByco>  
 data.cbSize=sizeof(NOTIFYICONDATA); iO dk)  
 data.hWnd=GetSafeHwnd(); M `49ydh&  
 data.uID=98; /=[hRn@)A  
 Shell_NotifyIcon(NIM_DELETE,&data); {' UK> S  
 ShowWindow(SW_SHOW); hkDew0k  
 SetForegroundWindow(); 1wLEkp!~  
 ShowWindow(SW_SHOWNORMAL); L(q~%  
 bTray=FALSE; Ve[[J"ze  
} m:)s UC0  
j58'P 5N  
void CCaptureDlg::OnChange() aflBDo1c  
{  jAxrU  
 RegisterHotkey(); a^7HI,  
}  uWkn}P  
560`R>  
BOOL CCaptureDlg::RegisterHotkey() ,DD}o  
{ 1'!%$D  
 UpdateData(); hH~GH'dnaE  
 UCHAR mask=0; =3EE-%eF!  
 UCHAR key=0; 9P&{Xhs7  
 if(m_bControl) rAZ~R PrW  
  mask|=4; S#b)RpY  
 if(m_bAlt) }q=tg9  
  mask|=2; "V <WC"  
 if(m_bShift) Vtv1{/@+c  
  mask|=1; v!j%<H`NI  
  key=Key_Table[m_Key.GetCurSel()]; i$6o>V6  
 if(bRegistered){ srryVqgS  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); Ns$,.D  
  bRegistered=FALSE; M~ g{}_ 0Z  
 } Xu7lV  
 cMask=mask; ]Q -.Y-J/O  
 cKey=key; z,g\7F[  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); >9,LN;Ic  
 return bRegistered; ,0aRHy_^  
}  tPChVnB  
R,`3 SW()  
  四、小结 Bejk^V~  
OWZ;X}x  
  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
欢迎提供真实交流,考虑发帖者的感受
认证码:
验证问题:
10+5=?,请输入中文答案:十五