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
  • 6680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: / )0hsQs  
  0p.bmQSH  
  一、实现方法 n ]ikc|  
c:[k+_Zr  
  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: xO$P C,  
]B8 A  
#pragma data_seg("shareddata") GQ_KYS{  
HHOOK hHook =NULL; //钩子句柄 i`,FXF)  
UINT nHookCount =0; //挂接的程序数目 rIb+c=|F  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 Cj5mM[:s  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 =x~I'|%3  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey V\~.  
static int KeyCount =0; H= dIZ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 OvdT* g=8*  
#pragma data_seg() 6( HF)z  
:t?B)  
  关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。 V0ze7tSG[f  
,'#TdLe  
  DLL中的两个输出函数分别用来添加/删除热键,函数代码如下: )U^=`* 7  
Ob d n#Wm=  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR W{p}N  
cKey,UCHAR cMask) 7Z-j'pq  
{ _vQ52H,  
 BOOL bAdded=FALSE; : =QX^*  
 for(int index=0;index<MAX_KEY;index++){  U 'jt'(  
  if(hCallWnd[index]==0){  vSzpx  
   hCallWnd[index]=hWnd; /-=fWtA  
   HotKey[index]=cKey; {@Wv@H+4  
   HotKeyMask[index]=cMask; m 0HK1'  
   bAdded=TRUE; _0/unJl`  
   KeyCount++; Lx"GBEkt7  
   break; #A63?kDE&&  
  } ] 5Cr$%H=  
 } UBvp3 2p  
 return bAdded; 5'%I4@Qn+  
} ^$c#L1 C  
//删除热键 %L|fTndKH  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) F^ q{[Z  
{ w$2q00R>  
 BOOL bRemoved=FALSE; 1#vy# '  
 for(int index=0;index<MAX_KEY;index++){ .35(MFvq!  
  if(hCallWnd[index]==hWnd){ AGhenDN V  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ dab]>% M  
    hCallWnd[index]=NULL; "~KDm(D  
    HotKey[index]=0; K;K0D@>]HR  
    HotKeyMask[index]=0; gF6> /  
    bRemoved=TRUE; ^z,3#gK  
    KeyCount--; 0cG'37[  
    break; hCxg6e<[  
   } )>a~%~:  
  } m$0W^u  
 } F>;Wbk&[|  
 return bRemoved; }T5@P {3P3  
} w OL,LU  
K:Z$V  
U%3N=M  
  DLL中的钩子函数如下: ( eV,f  
Q_mphW:[  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) lyn%r  
{ An2 >]\L  
 BOOL bProcessed=FALSE; h5?^MRZS  
 if(HC_ACTION==nCode) E'iE#He  
 { _!xrBdaJ  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 jIh1)*]054  
   switch(wParam) {3Inj8a=?A  
   {  E@VQxB7+  
    case VK_MENU: tE*BZXBlm  
     MaskBits&=~ALTBIT; 87 gk  
     break; Bdo{zv&A  
    case VK_CONTROL: ^[<BMk  
     MaskBits&=~CTRLBIT; )JMqC+J3*t  
     break; fit{n]g  
    case VK_SHIFT: dsTX?E<R  
     MaskBits&=~SHIFTBIT; 3%v)!dTa<^  
     break; /=2aD5r  
    default: //judge the key and send message NuZ2,<~9  
     break; cILS  
   } {f06Ki  
   for(int index=0;index<MAX_KEY;index++){ -()WTdIy  
    if(hCallWnd[index]==NULL) (/y8KG 3  
     continue; W(q3m;n  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) ~yv7[`+Tgg  
    { !GOaBs  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); Emlj,c<?j  
     bProcessed=TRUE; ;"dX]":  
    } XkI'm\W  
   } N'{[BA(eE  
  } ^O|fw?,  
  else if((lParam&0xc000ffff)==1){ //有键按下 ~${~To8$CW  
   switch(wParam) 0C4eer+D  
   { 0O3O^ 0  
    case VK_MENU: ]4aPn  
     MaskBits|=ALTBIT; AVT % AS  
     break; OP/DWf  
    case VK_CONTROL: G ;j1zs  
     MaskBits|=CTRLBIT; aH }/+Hu-  
     break; a4:GGzt  
    case VK_SHIFT: o3 0C\  
     MaskBits|=SHIFTBIT; 0/HFLz'  
     break; CR4O#f8\  
    default: //judge the key and send message v[L+PD U  
     break; St5;X&Q  
   } S:1[CNL;  
   for(int index=0;index<MAX_KEY;index++){ #]h X ."b2  
    if(hCallWnd[index]==NULL) 6 Bq_<3P_  
     continue; KL \>-  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) t6Iy5)=zY  
    { _E '?U  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); gIo\^ktW  
     bProcessed=TRUE; 2u.0AG   
    } 3IYFvq~  
   } HK )m^!=  
  } zPnb_[YF  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 Y0(4]X \ey  
   for(int index=0;index<MAX_KEY;index++){ e!6yxL*[@[  
    if(hCallWnd[index]==NULL) jNj;#C)  
     continue; !Yof%%m$;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) /8; m.J>bf  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); r+#{\~r7T  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 n/ KO{:  
   } Gz&}OO  
  } EE 9w^.3a  
 } h,c*:  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); ;JxL>K(  
} C1 ^%!)  
\'~ E%=Q  
  抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码: 36.,:!%p  
GDSV:]hL  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Vh~hfj"  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 4iAF<|6s  
+b 6R  
  为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下: n])#<0  
^PEw#.WG  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) y#Dh)~|k  
{ N3"JouP  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) JQ?`l)4  
 { 'K4FS(q  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 <WP@q&^k\  
  SaveBmp(); m-t: ' B  
  return FALSE; M50I.Rd  
 } :)1"yo\  
 …… //其它处理及默认处理 9FDu{4:  
} NQ`D"n  
+W4}&S  
ko9}?qs  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 k[@P526  
T-N>w;P  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 JP4DV=}L  
2.3_FXSt  
  二、编程步骤 F*P0=DD  
+gd5&  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; 8m") )i-  
;M?)-dpZ  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; -;9 }P  
CM?:\$ 4  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; HoPpUq5,  
c|/HX%Y  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; ! JA;0[;l=  
LGt>=|=bj  
  5、 添加代码,编译运行程序。 =Pv_,%  
2j+w5KvU  
三、程序代码 %mC@}  
wqo:gW_  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL Et3]n$  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) ^Wld6:L{I  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ poBeEpbs  
#if _MSC_VER > 1000 M FIb-*wT  
#pragma once c9+G Qp  
#endif // _MSC_VER > 1000 g,d_  
#ifndef __AFXWIN_H__ -+ByK#<%  
#error include 'stdafx.h' before including this file for PCH cUq]PC$|  
#endif zA5nr`  
#include "resource.h" // main symbols vX:}tir[  
class CHookApp : public CWinApp s!(R  
{ v_XN).f;  
 public: pyhXET '  
  CHookApp(); 2W+~{3[#  
  // Overrides es7;eH*O9  
  // ClassWizard generated virtual function overrides ( eKgc  
  //{{AFX_VIRTUAL(CHookApp) `4*I1WZW  
 public: 'OnfU{Ai  
  virtual BOOL InitInstance(); jf3Zy :*K  
  virtual int ExitInstance(); =d8Rij-  
  //}}AFX_VIRTUAL 7wj2-BWa  
  //{{AFX_MSG(CHookApp) lgews"  
  // NOTE - the ClassWizard will add and remove member functions here. ehW[LRtq  
  // DO NOT EDIT what you see in these blocks of generated code ! CE3l_[c  
  //}}AFX_MSG LtRRX@qJw  
  DECLARE_MESSAGE_MAP() ExG(*[l  
}; [~N;d9H+*1  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); ]1++$Ej  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); b d 1^  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); v_zt$bf{Y  
BOOL InitHotkey(); CFFb>d  
BOOL UnInit(); ZuGSRGX'  
#endif ^/#+0/Bn  
#R5\k-I  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. O_;BZzT  
#include "stdafx.h" _&l8^MD  
#include "hook.h" jV2H61d  
#include <windowsx.h> ?J2{6,}O*.  
#ifdef _DEBUG wm@j(h4  
#define new DEBUG_NEW 4 $R!)  
#undef THIS_FILE IRg2\Hq  
static char THIS_FILE[] = __FILE__; l`\L@~ln  
#endif Ubu&$4a  
#define MAX_KEY 100 Lc~m`=B  
#define CTRLBIT 0x04 THwM',6  
#define ALTBIT 0x02 5.^pD9[mT  
#define SHIFTBIT 0x01 *z[vp2 TN  
#pragma data_seg("shareddata") {jD?obs  
HHOOK hHook =NULL; dSwfea_  
UINT nHookCount =0; q]{gAGe~  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey }tt%J[  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT uL)MbM]  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey h.tj8O1  
static int KeyCount =0; "\*)KH`C  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift :Ak^M~6a5  
#pragma data_seg() ;Pk"mC  
HINSTANCE hins; 8 o}5QOW  
void VerifyWindow(); St?mq* ,  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) vGyQ306  
//{{AFX_MSG_MAP(CHookApp) Q%O9DCi  
// NOTE - the ClassWizard will add and remove mapping macros here. #m|el@)  
// DO NOT EDIT what you see in these blocks of generated code! Qb@j8Xa4[  
//}}AFX_MSG_MAP DAq H  
END_MESSAGE_MAP() u8 k^\Do  
1tXc7NA<  
CHookApp::CHookApp() P{dR pH|  
{ b!g)/%C  
 // TODO: add construction code here, $MasYi  
 // Place all significant initialization in InitInstance >*!T`P}p  
} o2(w  
SsX$l<t*  
CHookApp theApp; cPIyD?c  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) xLIyh7$t  
{ HV!P]82Pa  
 BOOL bProcessed=FALSE; `_vPElQXZ#  
 if(HC_ACTION==nCode) ` .`:~_OE  
 { Rb<| <D+  
  if((lParam&0xc0000000)==0xc0000000){// Key up 9>+>s ?IgK  
   switch(wParam) TJP;!uX  
   { K/(LF}  
    case VK_MENU: 9I 6^-m@:  
     MaskBits&=~ALTBIT; QqL?? p-S>  
     break; 36'J9h\  
    case VK_CONTROL: ruqE]Hx9(  
     MaskBits&=~CTRLBIT; QPVr:+\B{  
     break; [ 2@Lc3<  
    case VK_SHIFT: lU|ltnU  
     MaskBits&=~SHIFTBIT; Nj6Np^@sH  
     break; aJm5`az)  
    default: //judge the key and send message f~d =1  
     break; Q9y|1Wg1W  
   } :x q^T  
   for(int index=0;index<MAX_KEY;index++){ jM*wm~4>@  
    if(hCallWnd[index]==NULL) #euOq  
     continue; FIn)O-<  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) <\:*cET3  
    { "~C \Z} ;  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); ;F_&h#D]3  
     bProcessed=TRUE; ,_,7c or  
    } p38s&\-kEN  
   } J!rZs kd  
  } Rpcnpo  
  else if((lParam&0xc000ffff)==1){ //Key down dkEnc  
   switch(wParam) yyR@kOGga  
   { 7; }TNK\+v  
    case VK_MENU: nkkGJV!  
     MaskBits|=ALTBIT; LY0/\Z"N  
     break; /9y'UKl7[  
    case VK_CONTROL: YS"76FJ  
     MaskBits|=CTRLBIT; 7Ph+Vs+h  
     break; 9 DXu*}  
    case VK_SHIFT: ;c~DBJg'|  
     MaskBits|=SHIFTBIT; '9wD+'c=A  
     break; `0ju=FP'u5  
    default: //judge the key and send message -JF|770i  
     break; 4ri)%dl1  
   } L3Q1az!Ct  
   for(int index=0;index<MAX_KEY;index++) \v_t: "  
   { FHH2  
    if(hCallWnd[index]==NULL) !as<UH"\  
     continue; EVmE{XlD;  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) j1toV$)P  
    { r3{o _w  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); **YNR:#Y  
     bProcessed=TRUE; ;lWy?53=@  
    } $j}sxxTT  
   } Tf[-8H<  
  } >Q\H1|?  
  if(!bProcessed){ Mz{ Rh+gS  
   for(int index=0;index<MAX_KEY;index++){ cl7+DAE  
    if(hCallWnd[index]==NULL) !c`Q?aGV)  
     continue; Y=rW.yK8  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Iei4yDv ;  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); k0D&F;a%  
   } 7erao-  
  } 9'8oOBqm3%  
 } z06pX$Q.<  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); !%M-w0vC9  
} v <Ze$^ e&  
M[*:=C)H  
BOOL InitHotkey() 5BCaE)J  
{ Q}.y"|^  
 if(hHook!=NULL){ {}^ELw  
  nHookCount++; 6k3l/~R  
  return TRUE; u!`C:C'  
 } ujWHO$uz!  
 else ng<`2XgU  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); ?H c A&  
  if(hHook!=NULL) ;^8^L'7cr  
   nHookCount++; f"0H9  
  return (hHook!=NULL); =nL*/  
} g4$%)0x%  
BOOL UnInit() ft6^s(t  
{ w+$gY?%  
 if(nHookCount>1){ RK3/!C`  
  nHookCount--; =K>Z{% i  
  return TRUE; O`0$pn  
 } (Mm{"J3uv  
 BOOL unhooked = UnhookWindowsHookEx(hHook); QF;<%QF:  
 if(unhooked==TRUE){ 9G8QzIac  
  nHookCount=0; \mu9ikZ<  
  hHook=NULL; qtH&]Suu,  
 } =U2Te  
 return unhooked; omA*XXUx=8  
} :{ T#M$T  
ZAH<!@qh  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) udZ: OU<  
{ #rr-4$w+  
 BOOL bAdded=FALSE; #Fd( [Zx#.  
 for(int index=0;index<MAX_KEY;index++){ 7Mv$.Z(  
  if(hCallWnd[index]==0){ VfcQibm  
   hCallWnd[index]=hWnd; Z%{f[|h9}  
   HotKey[index]=cKey; G!;[If :<e  
   HotKeyMask[index]=cMask; .>'Z9.Xnk  
   bAdded=TRUE; Lb{D5k*XU  
   KeyCount++; Qd4T?5 vG  
   break; /_a *C.a6  
  } w;$+7  
 } KRZV9AJ  
 return bAdded; E\S&} K,s  
} g\)z!DQ]  
"\[>@_p h  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) _MEv*Q@o  
{ \veL5  
 BOOL bRemoved=FALSE; dZgfls  
 for(int index=0;index<MAX_KEY;index++){ {@$3bQ  
  if(hCallWnd[index]==hWnd){ UVJ(iNK"  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ /6c10}f  
    hCallWnd[index]=NULL; Z :+#3.4$3  
    HotKey[index]=0; _64@zdL+  
    HotKeyMask[index]=0; 3T/j5m}+!  
    bRemoved=TRUE; i|^6s87"N2  
    KeyCount--; rfi`Bp  
    break; w0Y%}7  
   } []0~9,u  
  } rtx]dc1m  
 } c7IR06E  
 return bRemoved; I}IW!K  
} ?|GxVOl  
`=DCX%Vw  
void VerifyWindow() r![JPhei  
{ RA I&;"  
 for(int i=0;i<MAX_KEY;i++){ *$C[![   
  if(hCallWnd!=NULL){ zpqNmxmF  
   if(!IsWindow(hCallWnd)){ x 4</\o  
    hCallWnd=NULL; !@Lc/'w  
    HotKey=0; ]/Qy1,  
    HotKeyMask=0; \q'fB?bS^  
    KeyCount--; 4"x;XVNM[  
   } S5KYZ W  
  } E_1I|$  
 } +|YZEC  
} =>\-ma+  
{dXBXC/Ju  
BOOL CHookApp::InitInstance() /t)c fFM  
{ oK:P@V6!  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); !gfhEz Y  
 hins=AfxGetInstanceHandle(); (<ZkmIXN  
 InitHotkey(); `lezJ (Xm  
 return CWinApp::InitInstance(); F(~_L.  
} xevP2pYG:  
'#PqI)P  
int CHookApp::ExitInstance()  &Z!K]OSY  
{ .]s( c!{y  
 VerifyWindow(); 3;S`<  
 UnInit(); ]~S+nl yd<  
 return CWinApp::ExitInstance(); Ca@=s  
} OrEuQ-,i@  
bTQa'y`3  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xTFrrmxOf  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) F*JvpI[7n  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 'Rd*X6dv  
#if _MSC_VER > 1000 _pko]F|()  
#pragma once "=\_++  
#endif // _MSC_VER > 1000 J7wQ=! g  
9_WPWFO  
class CCaptureDlg : public CDialog _OU.JrqC  
{ A :bPIXb  
 // Construction R 4$Q3vcH  
 public: t_>bTcsU  
  BOOL bTray; tG2OVRx8u  
  BOOL bRegistered; Gk"L%Zt)  
  BOOL RegisterHotkey(); +}1hU :qW  
  UCHAR cKey; Q|= Q]$d  
  UCHAR cMask; G</I%qM  
  void DeleteIcon(); !\#Wk0Ku  
  void AddIcon(); p=_XMh`;  
  UINT nCount; r ctSS:1  
  void SaveBmp(); ke9QT#~p!-  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor :x""E5H  
  // Dialog Data Bq~hV;9nf  
  //{{AFX_DATA(CCaptureDlg) jxnQG A  
  enum { IDD = IDD_CAPTURE_DIALOG }; O/Y\ps3r  
  CComboBox m_Key; 5Hwo)S]r  
  BOOL m_bControl; ..q63dr  
  BOOL m_bAlt; ?wLdW1&PpX  
  BOOL m_bShift; \7t5U7v8U  
  CString m_Path; UROj9CO v  
  CString m_Number; i'Y'HI  
  //}}AFX_DATA ,zN3? /7  
  // ClassWizard generated virtual function overrides P('t6MVl T  
  //{{AFX_VIRTUAL(CCaptureDlg) (lN;xT`=  
 public: &8]#RQy{f  
  virtual BOOL PreTranslateMessage(MSG* pMsg); 5"kx}f2$  
 protected: V/3 {^Fcr  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support WXLe,7y  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); [Y22Wi  
  //}}AFX_VIRTUAL nxyjL)!)0  
  // Implementation my\o P(e\  
 protected: ` /I bWu  
  HICON m_hIcon; a IpPL8a  
  // Generated message map functions [;?"R-V"z  
  //{{AFX_MSG(CCaptureDlg) oNuPP5d[]  
  virtual BOOL OnInitDialog(); ,C{^`Bk-W  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); iY ^{wi~?  
  afx_msg void OnPaint(); selP=Q!  
  afx_msg HCURSOR OnQueryDragIcon(); ` URSv,(  
  virtual void OnCancel(); aJ :A%+1  
  afx_msg void OnAbout(); k-WHHoU>o  
  afx_msg void OnBrowse(); Hs"% S  
  afx_msg void OnChange(); QFW0KD`5  
 //}}AFX_MSG X~v4"|a  
 DECLARE_MESSAGE_MAP() ,8c dXt   
}; /~i.\^HX  
#endif ~@T+mHny  
"_K}rI6(t  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file cT-K@dg  
#include "stdafx.h" \npz .g^c_  
#include "Capture.h" 4 ,p#:!  
#include "CaptureDlg.h" ";PG%_(  
#include <windowsx.h> -|m$YrzG  
#pragma comment(lib,"hook.lib") l^k+E-w\  
#ifdef _DEBUG G*i.a*9<)  
#define new DEBUG_NEW XVQL.A7  
#undef THIS_FILE 0jR){G9+  
static char THIS_FILE[] = __FILE__; bnijM/73  
#endif [O^}rUqq  
#define IDM_SHELL WM_USER+1 i{gDW+N  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); IWAj Mwo  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); p{NPcT%&  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; h ZoC _\  
class CAboutDlg : public CDialog L)q`D2|'  
{  QTVa  
 public: I+0c8T(:  
  CAboutDlg(); QT#b>xV)1  
  // Dialog Data hIR@^\?  
  //{{AFX_DATA(CAboutDlg) @. "q  
  enum { IDD = IDD_ABOUTBOX }; 7egq4gN]2Y  
  //}}AFX_DATA y k?SD1hj  
  // ClassWizard generated virtual function overrides FyCBN tCv  
  //{{AFX_VIRTUAL(CAboutDlg) 7g-Dfg.w  
 protected: #`/bQ~s  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support dIma{uv  
  //}}AFX_VIRTUAL $h,d? .u6w  
  // Implementation +<&E3Or  
 protected: ]de\i=?|  
  //{{AFX_MSG(CAboutDlg) Zw+=ng.q?  
  //}}AFX_MSG cI5N"U@yN  
  DECLARE_MESSAGE_MAP() wY/bA}%  
}; '?5S"??  
$Jcq7E~  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) =tq1ogE  
{ j(sLK &  
 //{{AFX_DATA_INIT(CAboutDlg) {o( * f  
 //}}AFX_DATA_INIT -!l^]MU  
} }7%9}2}Iw  
:i.t)ES  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1DUb [W8  
{ }"hW b(  
 CDialog::DoDataExchange(pDX); 6.[)`iF+#  
 //{{AFX_DATA_MAP(CAboutDlg) #*^e,FF<  
 //}}AFX_DATA_MAP E30Ln_^o  
} P7Xg{L&@.  
$%=G[/i'  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) RB [/q:  
 //{{AFX_MSG_MAP(CAboutDlg) i0\)%H:z  
 // No message handlers SyAo, )j  
 //}}AFX_MSG_MAP e gI&epN  
END_MESSAGE_MAP() ]w!0u2K<Q\  
q(gjT^aN  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) w-ALCh8o  
: CDialog(CCaptureDlg::IDD, pParent) +Juh:1H  
{ "Kq>#I'%W  
 //{{AFX_DATA_INIT(CCaptureDlg) q4/909x=  
  m_bControl = FALSE; ytiyF2Kp  
  m_bAlt = FALSE; W!91tzs:  
  m_bShift = FALSE; o5SQ1;`   
  m_Path = _T("c:\\"); z6I%wh  
  m_Number = _T("0 picture captured."); Z5$fE7ba+  
  nCount=0; ~@D/A/|  
  bRegistered=FALSE; P 6.!3%y  
  bTray=FALSE; |NJ}F@t/5  
 //}}AFX_DATA_INIT >La><.z~  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 9,scH65x  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); FAw1o  
} GJ,a RI  
VO_dA4C}z  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) R 5(F)abi  
{ H:Y&OZ  
 CDialog::DoDataExchange(pDX); W:vr@e6  
 //{{AFX_DATA_MAP(CCaptureDlg) 8Q=ZH=SQK  
  DDX_Control(pDX, IDC_KEY, m_Key); s6n`?,vw  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); hF>u)%J/S  
  DDX_Check(pDX, IDC_ALT, m_bAlt); UV@0gdy[  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); `eR 7H>I  
  DDX_Text(pDX, IDC_PATH, m_Path); |55dbL$w  
  DDX_Text(pDX, IDC_NUMBER, m_Number); Ac`;st%l.  
 //}}AFX_DATA_MAP A[)C:q,  
} "%@v++4y  
R/~,i;d>  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) "VTF}#Uo  
//{{AFX_MSG_MAP(CCaptureDlg) v@n_F  
 ON_WM_SYSCOMMAND() Jzex]_:1~  
 ON_WM_PAINT() ]C!?HQ{bsf  
 ON_WM_QUERYDRAGICON() Q4Q pn  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) I2[]A,f ,  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) R5(T([w'  
 ON_BN_CLICKED(ID_CHANGE, OnChange) q.W>4 k  
//}}AFX_MSG_MAP T$P-<s  
END_MESSAGE_MAP() Wekqn!h  
[_.n$p-  
BOOL CCaptureDlg::OnInitDialog() E ]f)Os$  
{ [>Fm [5x  
 CDialog::OnInitDialog(); B<,YPS8w  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); |]sx+NlNc  
 ASSERT(IDM_ABOUTBOX < 0xF000); >2lwWXA  
 CMenu* pSysMenu = GetSystemMenu(FALSE); VteEDL/w  
 if (pSysMenu != NULL) >cgpajx*  
 { !20X sO  
  CString strAboutMenu; e fO jTA%  
  strAboutMenu.LoadString(IDS_ABOUTBOX); Gu;OV LR|  
  if (!strAboutMenu.IsEmpty()) i zwUS!5e  
  { sn{tra  
   pSysMenu->AppendMenu(MF_SEPARATOR); ^sClz*%?  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); )(TAT<  
  } t'(1I|7  
 } #/70!+J_UF  
 SetIcon(m_hIcon, TRUE); // Set big icon h-QLV[^  
 SetIcon(m_hIcon, FALSE); // Set small icon Gquuy7[&  
 m_Key.SetCurSel(0); T?wzwGp-[  
 RegisterHotkey(); lm0N5(XP  
 CMenu* pMenu=GetSystemMenu(FALSE); q.V-LXM  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m;,xmEp  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); >*1}1~uU`'  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); .F2 :!h$  
 return TRUE; // return TRUE unless you set the focus to a control |FNCXlgZ  
} 6Q Zp@  
go'j/4Tp  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) #b)e4vwCq  
{ l "pN90B4  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) [hh/1[   
 { vHKlLl>*2  
  CAboutDlg dlgAbout; o\=n4;S  
  dlgAbout.DoModal(); \".^K5Pm  
 } C9~~O~7x  
 else z5 m>H;P  
 { K8[DZ)rO;Z  
  CDialog::OnSysCommand(nID, lParam); {/8Q)2*>0  
 } (z7+|JE.  
} v"O5u%P  
NXk!qGV2  
void CCaptureDlg::OnPaint() T.:+3:8|F  
{ zfI}Q}p  
 if (IsIconic()) k$i'v:c|:i  
 { ~Y!kB:D5;~  
  CPaintDC dc(this); // device context for painting dcfe_EuT  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); {2KFD\i\  
  // Center icon in client rectangle Ip *g'  
  int cxIcon = GetSystemMetrics(SM_CXICON); nE W31 8  
  int cyIcon = GetSystemMetrics(SM_CYICON); pdVQ*=c?M  
  CRect rect; kxB.,'  
  GetClientRect(&rect); zJN7<sv  
  int x = (rect.Width() - cxIcon + 1) / 2; 5Fw - d  
  int y = (rect.Height() - cyIcon + 1) / 2; I PCGt{B~  
  // Draw the icon b/("Y.r=  
  dc.DrawIcon(x, y, m_hIcon); nv/[I,nw  
 } i@P}{   
 else j}JZ  
 { gzn^#3b  
  CDialog::OnPaint(); MgMD\  
 } &#{dWObh  
} /Lf6WMit  
2DDsWJ;  
HCURSOR CCaptureDlg::OnQueryDragIcon() 1Y j~fb(  
{ t0E51Ic@  
 return (HCURSOR) m_hIcon; V-yUJ#f8[  
} Kq6jw/T  
FY3IUG  
void CCaptureDlg::OnCancel() :l\V'=%9'@  
{ L"+$Wc[|  
 if(bTray) iw?I  
  DeleteIcon(); =r. >N\  
  CDialog::OnCancel(); I/J7rkf  
} r7m D{0s*  
cntco@  
void CCaptureDlg::OnAbout() -0uV z)  
{ N:5[,O<m_  
 CAboutDlg dlg; &:#h$`4  
 dlg.DoModal(); V*[b} Xew  
} qt e>r  
e /K#>,  
void CCaptureDlg::OnBrowse() RVw9Y*]b  
{ u{H?4|'(  
 CString str; cI0 ]}S  
 BROWSEINFO bi; R!\EK H  
 char name[MAX_PATH]; , \)a_@@k  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); #;KsJb)N.  
 bi.hwndOwner=GetSafeHwnd(); ^ZRYRA  
 bi.pszDisplayName=name; aBuoHdg;  
 bi.lpszTitle="Select folder"; S::=85[>z  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; F =a+z/xKT  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); ]3{0J  
 if(idl==NULL) }WLh8i?_  
  return; +~zXDBS9  
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); uq3{h B#  
 str.ReleaseBuffer(); NPnHH:\;  
 m_Path=str; sy* y\5yJ  
 if(str.GetAt(str.GetLength()-1)!='\\') )$%Z:  
  m_Path+="\\"; LaFZ?7@|}  
 UpdateData(FALSE); m!n/U-^  
}  (t^n'V  
\*vHB`.,ey  
void CCaptureDlg::SaveBmp() Dr3n+Q   
{ U\@A _ B  
 CDC dc; j V3)2C}  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); } l 667N  
 CBitmap bm; ;i uQ?MR3  
 int Width=GetSystemMetrics(SM_CXSCREEN); ` TqSQg_l  
 int Height=GetSystemMetrics(SM_CYSCREEN); Yf_6PGNzX  
 bm.CreateCompatibleBitmap(&dc,Width,Height); z`Wt%tL(  
 CDC tdc; ;Y9=!.Ak0y  
 tdc.CreateCompatibleDC(&dc); 3Mjj' 5KH!  
 CBitmap*pOld=tdc.SelectObject(&bm); AEirj /  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); gO?44^hMe  
 tdc.SelectObject(pOld); /lhz],w  
 BITMAP btm; F t&+vS  
 bm.GetBitmap(&btm); 0rSIfYZa  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; +>^7vq-\'  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); 5X.ebd;PT  
 BITMAPINFOHEADER bih; RSfM]w}Hq#  
 bih.biBitCount=btm.bmBitsPixel; nv0@xnbz  
 bih.biClrImportant=0; Lz9#A.  
 bih.biClrUsed=0; rt7<Q47QE  
 bih.biCompression=0; B/f0P(7  
 bih.biHeight=btm.bmHeight; G#`\(NW  
 bih.biPlanes=1; 'Ye v} QM  
 bih.biSize=sizeof(BITMAPINFOHEADER); fG LG$b  
 bih.biSizeImage=size; 0*%&>  
 bih.biWidth=btm.bmWidth; %u\26[/  
 bih.biXPelsPerMeter=0; 5MTgK=c  
 bih.biYPelsPerMeter=0; 8kL4~(hY  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 8;P2A\ X  
 static int filecount=0; A?!I/|E^;  
 CString name; '!h/B;*(  
 name.Format("pict%04d.bmp",filecount++); rZ1Hf11C  
 name=m_Path+name; .\3`2  
 BITMAPFILEHEADER bfh; `iKj  
 bfh.bfReserved1=bfh.bfReserved2=0; 2C^B_FUg|]  
 bfh.bfType=((WORD)('M'<< 8)|'B'); sRHA."A!8  
 bfh.bfSize=54+size; o}Cq.[G4k  
 bfh.bfOffBits=54; 4EP<tV  
 CFile bf; SS|z*h Z  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ -<_$m6x"A  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); yBe d kj  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u`:hMFTID  
  bf.WriteHuge(lpData,size); #Doq P:  
  bf.Close(); K ?$#nt p  
  nCount++; cS .i  
 } a T  l c  
 GlobalFreePtr(lpData); uwIc963  
 if(nCount==1) q> :$c0JY  
  m_Number.Format("%d picture captured.",nCount); ( n{wg(R  
 else vH %gdpxX  
  m_Number.Format("%d pictures captured.",nCount); 9Mm!%Hu  
  UpdateData(FALSE); N[|Nxm0z/C  
} B#%; Qc  
pY8q=Kl  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) .S\&L-{  
{ #%3rTU  
 if(pMsg -> message == WM_KEYDOWN) nQK|n^AU/  
 { H&}ipaDO  
  if(pMsg -> wParam == VK_ESCAPE) cp Ear  
   return TRUE; ,38Eq`5&W  
  if(pMsg -> wParam == VK_RETURN) m(OvD!  
   return TRUE; u~zs* qp  
 } 9?T{}| ?  
 return CDialog::PreTranslateMessage(pMsg); ~vdkFc(8B  
} /nx'Z0&+X  
&:*q_$]Oz  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) }1 vT)  
{ donw(_=  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ !hxIlVd{  
  SaveBmp(); O  OFVnu  
  return FALSE; Z^KA  
} 6X g]/FD  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 3#kitmV  
 CMenu pop; 72 TI  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); D]! aT+  
 CMenu*pMenu=pop.GetSubMenu(0); J<n+\F-s  
 pMenu->SetDefaultItem(ID_EXITICON); uv{P,]lK  
 CPoint pt; }_.:+H!@  
 GetCursorPos(&pt); o@>? *=  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); 5m$2Ku  
 if(id==ID_EXITICON) ]Z<_ " F  
  DeleteIcon(); H/F+X?t$0  
 else if(id==ID_EXIT) jZfx Jm  
  OnCancel(); Vsq8H}K  
 return FALSE; Si}HX!s  
} TTNk r`  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); )w~Fo,   
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) p 5u_1U0  
 AddIcon(); j|.} I  
 return res; (n( fI f  
} omZO+=8Q  
vy@rQC %9  
void CCaptureDlg::AddIcon() %n0;[sD0A  
{ )bOBQbj  
 NOTIFYICONDATA data; _K2?YY(#>  
 data.cbSize=sizeof(NOTIFYICONDATA); Zwt;d5U  
 CString tip; 3Q}$fQ&S  
 tip.LoadString(IDS_ICONTIP); "GT4s?6O  
 data.hIcon=GetIcon(0); ~IVd vm7  
 data.hWnd=GetSafeHwnd(); YL^=t^ !4  
 strcpy(data.szTip,tip);  Rxpn~QQ  
 data.uCallbackMessage=IDM_SHELL; RH)EB<PV  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -XoPia2  
 data.uID=98; ,M !tm7  
 Shell_NotifyIcon(NIM_ADD,&data); }|)R   
 ShowWindow(SW_HIDE); HYr}wG  
 bTray=TRUE; k4J8O3E  
} :)f7A7:;  
Kz8:UG(  
void CCaptureDlg::DeleteIcon() xk~IN%\  
{ Upl6:xYrG  
 NOTIFYICONDATA data; T4e\0.If  
 data.cbSize=sizeof(NOTIFYICONDATA); ;d.K_P  
 data.hWnd=GetSafeHwnd(); iItcN;;7  
 data.uID=98; #1'\.v  
 Shell_NotifyIcon(NIM_DELETE,&data); KP;(Q+qTx  
 ShowWindow(SW_SHOW); ".*x!l0y7  
 SetForegroundWindow(); +H/jK@  
 ShowWindow(SW_SHOWNORMAL); SD\= m/W  
 bTray=FALSE; w^k;D,h  
} $>M<j  
l|`9:H  
void CCaptureDlg::OnChange() Ko>&)%))$X  
{ I<b?vR 'F  
 RegisterHotkey(); FX <b:#  
} 8$N8}q%  
~`;rNnOT3  
BOOL CCaptureDlg::RegisterHotkey() 9ch#}/7B  
{ GnXNCeE`  
 UpdateData(); iL{M+Ic  
 UCHAR mask=0; 6Z?j AXGSq  
 UCHAR key=0; `[#x_<\t  
 if(m_bControl) yj6@7@l>A  
  mask|=4; tqPx$s  
 if(m_bAlt) ^62|d  
  mask|=2; V+-$ jOh  
 if(m_bShift) h~U02"$  
  mask|=1; x Ha=3n  
  key=Key_Table[m_Key.GetCurSel()]; nq} Q  
 if(bRegistered){ 8 S`9dSc  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); fyz nuUl  
  bRegistered=FALSE; "bg'@:4F  
 } NY$uq+Z>  
 cMask=mask; (fD ;g9  
 cKey=key; R)?{]]v  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask);  c9''  
 return bRegistered; <BWkUZz\P|  
} ~cAZB9Fa  
e)nimq {6  
  四、小结 YIt9M,5/Q  
<O?y-$~  
  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
如果您提交过一次失败了,可以用”恢复数据”来恢复帖子内容
认证码:
验证问题:
10+5=?,请输入中文答案:十五