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
  • 4944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: (u?s@/e:`/  
  r'i99 ~  
  一、实现方法 ]D6<6OB  
kHK<~srB  
  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: $ DN.  
sX?arI=_U  
#pragma data_seg("shareddata") ~D5 -G?%$"  
HHOOK hHook =NULL; //钩子句柄 }-[l)<F:  
UINT nHookCount =0; //挂接的程序数目 0hS&4nW  
static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码 IR/S`HD_  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1 k7Nx#%xx  
static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey oypLE=H  
static int KeyCount =0; LsR<r1KDJ  
static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1 2[w9#6ly  
#pragma data_seg() {A}T^q!m]  
<(E)M@2  
  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。 uz8eS'8  
P0UR{tK  
  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: caEIE0H~  
9^Xndo]y  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR +9HU&gQ3  
cKey,UCHAR cMask) {r&r^!K;  
{ &wNr2PHd#  
 BOOL bAdded=FALSE; <@7j37,R7V  
 for(int index=0;index<MAX_KEY;index++){ za6 hyd^  
  if(hCallWnd[index]==0){ R655@|RT  
   hCallWnd[index]=hWnd; 6UIS4 _   
   HotKey[index]=cKey; ^ iu)vED  
   HotKeyMask[index]=cMask; 8z93ETv7`  
   bAdded=TRUE; q`AsnAzo&  
   KeyCount++; $;g*s?F*  
   break; yc0 1\o  
  } d^'_H>x  
 } -Ua5anzB  
 return bAdded; @Hj]yb5  
} |(~IfSE2  
//删除热键 .Z 7t E?  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) ,5 8-h?B0v  
{ DvWBvs,  
 BOOL bRemoved=FALSE; _~Lu%   
 for(int index=0;index<MAX_KEY;index++){ |f}wOkl  
  if(hCallWnd[index]==hWnd){ `c:r`Oi?  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ wgSFL6Ei  
    hCallWnd[index]=NULL; T #E{d  
    HotKey[index]=0; }r04*P(  
    HotKeyMask[index]=0; R1*&rjB  
    bRemoved=TRUE; ~ &/Nl_#  
    KeyCount--; K%9!1'  
    break; -/8V2dv3  
   } ;4+z~7Je]^  
  } 2Jo|P A` 9  
 } (ht"wY#T<(  
 return bRemoved; n(A;:) W{  
} +46& Zb35  
_WV13pnRu  
b?k,_; \  
  DLL中的钩子函数如下: Jn(|.eT|  
QP%AJ[3ea%  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) 3meZ]u  
{ P'}EZ'  
 BOOL bProcessed=FALSE; JNU9RxR  
 if(HC_ACTION==nCode) 8f,",NCgc  
 { yJx,4be  
  if((lParam&0xc0000000)==0xc0000000){// 有键松开 k8Dk;N  
   switch(wParam) QKk7"2t|  
   {  ,9OER!$y  
    case VK_MENU: w_@6!zm  
     MaskBits&=~ALTBIT; :4:U\k;QwA  
     break; M!G/5:VZ  
    case VK_CONTROL: *"|f!t  
     MaskBits&=~CTRLBIT; 0>Kgz!I  
     break; ~Q- /O~  
    case VK_SHIFT: TGpdl`k\T  
     MaskBits&=~SHIFTBIT; =)#XZ[#F  
     break; B"7~[,he  
    default: //judge the key and send message uxW |&q  
     break; $y)tcVc  
   } %i&am=  
   for(int index=0;index<MAX_KEY;index++){ MDpx@.A,  
    if(hCallWnd[index]==NULL) ][f0ZMa  
     continue; fN`Prs A  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) - 6q7ze{@  
    { ~H ctXe'x  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); 8pmWw?  
     bProcessed=TRUE; T+V:vuK  
    } 5=s|uuw/  
   } Lxa<zy~b  
  } 0l(G7Ju  
  else if((lParam&0xc000ffff)==1){ //有键按下 n`Ypv{+ {%  
   switch(wParam) #;2kN &  
   { <Rt0 V%}-  
    case VK_MENU: ziAn9/sT  
     MaskBits|=ALTBIT; .j!:Hp(z}  
     break; 2V @ pt  
    case VK_CONTROL: 5"#xbvRS0H  
     MaskBits|=CTRLBIT; j97c@  
     break; H8c -/  
    case VK_SHIFT: |$T?P*pI.  
     MaskBits|=SHIFTBIT; BQMo*I>I  
     break; q|.0Ja  
    default: //judge the key and send message h#h)=;  
     break; ud(w0eX  
   } B)DtJ f  
   for(int index=0;index<MAX_KEY;index++){ wh]v{Fi'  
    if(hCallWnd[index]==NULL) o hPXwp?]  
     continue; voN,u>U  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) eET1f8 B=L  
    { 5IG#-Q(6sp  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); .v) A|{:2  
     bProcessed=TRUE; `yXHb  
    } %H"AHkge:a  
   } mqQ//$Y   
  } <XpG5vV  
  if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地 o<S(ODOfi  
   for(int index=0;index<MAX_KEY;index++){ BBoVn^Z*R  
    if(hCallWnd[index]==NULL) !O,`Z`T?  
     continue; gA+@p'XnR  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) Jl) Q #  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); 5X`m.lhUc  
     //lParam的意义可看MSDN中WM_KEYDOWN部分 cT JG1'm  
   } ( Q k*B  
  } EU7mP MxJ  
 } r-}C !aF]  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); n\scOM)3  
} XQ k ,xQ  
:EC[YAK+D  
  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: ^@maF<Jb  
$8_b[~%2  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); m!<uY?,hf  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w##$SaTI  
9H%L;C5<  
  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: )J|~'{z:  
J16(d+  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 6$+F5T  
{ 4H%Ai(F}_  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN) /;1h-Rc>  
 { k5Df9 7\s  
  //lParam表示是按下还是松开,如果有多个热键,由wParam来区分 {Pi]i?   
  SaveBmp(); al Q:'K  
  return FALSE; (d5kD#.N  
 } SR'u*u!  
 …… //其它处理及默认处理 Y&b JKX  
} >x1?t  
i\P)P!  
rcMSso2  
  将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。 [tz}H&  
#F >R5 D  
  最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。 mvW,nM1Y  
Pu|3_3^  
  二、编程步骤 z/S}z4o/  
bu r0?q  
  1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture"; &qFy$`"  
$]]|#}J  
  2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数; <bOi}  
$~.'Tnk)  
  3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分; >BlF< d`X  
-6>T0-  
  4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数; 7%^ /Jm  
^5*9BwH`  
  5、 添加代码,编译运行程序。 u"1Zv!  
Y]{~ogsn$:  
三、程序代码 |"EQyV  
w97%5[-T  
///////////////////////////////////// Hook.h : main header file for the HOOK DLL 2~*.X^dR  
#if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_) S_56!  
#define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_ B=+Py%  
#if _MSC_VER > 1000 _ye74$#  
#pragma once >a2i%j/T  
#endif // _MSC_VER > 1000 Sy`7})[  
#ifndef __AFXWIN_H__ CrI:TB>/ "  
#error include 'stdafx.h' before including this file for PCH  [E|%  
#endif iwnFCZVS  
#include "resource.h" // main symbols /jv4# 9  
class CHookApp : public CWinApp t5WW3$Nf  
{ 6{PlclI !  
 public: -|A`+1-R+  
  CHookApp(); q*4=sf,>  
  // Overrides q'[q]  
  // ClassWizard generated virtual function overrides vTU*6)  
  //{{AFX_VIRTUAL(CHookApp) J9*$@&@S  
 public: hE>%LcP  
  virtual BOOL InitInstance(); le J\  
  virtual int ExitInstance(); ,O/ t6'  
  //}}AFX_VIRTUAL $Q< >M B7  
  //{{AFX_MSG(CHookApp) <C,lHt  
  // NOTE - the ClassWizard will add and remove member functions here. wLz@u$u?  
  // DO NOT EDIT what you see in these blocks of generated code ! &C=[D_h  
  //}}AFX_MSG f^?k?_~PN  
  DECLARE_MESSAGE_MAP() [kyIF\0  
}; aaM76;  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam); 6#/v:;bF  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); f+ Ht  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); W #kOcw  
BOOL InitHotkey(); R<n'v.~"A  
BOOL UnInit(); xF8^#J6>  
#endif 1MnT*w   
jou741  
//////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL. a"&Gs/QKSC  
#include "stdafx.h" m3E`kW |  
#include "hook.h" j>-O'CO  
#include <windowsx.h> 7[?{wbq  
#ifdef _DEBUG "nEfk{g  
#define new DEBUG_NEW q t!0#z8  
#undef THIS_FILE Ryrvu1 k  
static char THIS_FILE[] = __FILE__; P4S]bPIp  
#endif YZ0Jei8+-  
#define MAX_KEY 100 @is!VzE  
#define CTRLBIT 0x04 TO~Z6NA0  
#define ALTBIT 0x02 ^J-\s_)"  
#define SHIFTBIT 0x01 NhYce>  
#pragma data_seg("shareddata") B78e*nNS#2  
HHOOK hHook =NULL; _)? 59  
UINT nHookCount =0; B6#^a  
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey %RS8zN  
static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT X1PXX!]lo[  
static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey oF0BBs$  
static int KeyCount =0; p`-Oz]  
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift FH}2wO~_  
#pragma data_seg() J-wF2*0r<  
HINSTANCE hins; Td/J6Q9 0  
void VerifyWindow(); cg]>*lH  
BEGIN_MESSAGE_MAP(CHookApp, CWinApp) txp^3dZ`^  
//{{AFX_MSG_MAP(CHookApp) &3_.k  
// NOTE - the ClassWizard will add and remove mapping macros here. qlgo#[i  
// DO NOT EDIT what you see in these blocks of generated code! -\V!f6Q  
//}}AFX_MSG_MAP 84}Pu%  
END_MESSAGE_MAP() tlJ@@v&=  
\&Zp/;n  
CHookApp::CHookApp() T@)|0M  
{ +1o4l i  
 // TODO: add construction code here, T>2_r6;  
 // Place all significant initialization in InitInstance # %$U-ti  
} 70BLd(?  
7uW=fkxT  
CHookApp theApp; +<1MY'>y  
LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam) sOUQd-!"  
{ 1rLK1X  
 BOOL bProcessed=FALSE; oDBv5  
 if(HC_ACTION==nCode) 9`X}G`  
 { b>Em~NMu_  
  if((lParam&0xc0000000)==0xc0000000){// Key up /_l$h_{DH  
   switch(wParam) o!-kwtw`l  
   { cA8A^Iv:0  
    case VK_MENU: 6A23H7  
     MaskBits&=~ALTBIT; C_ 4(- OWq  
     break; JULns#tx}  
    case VK_CONTROL: y8arFG  
     MaskBits&=~CTRLBIT; y1c2(K>tu  
     break; M!)~h<YL  
    case VK_SHIFT: #M~6A^)  
     MaskBits&=~SHIFTBIT; a*(,ydF|L  
     break; l}MVk%[  
    default: //judge the key and send message yJn<S@)VT:  
     break; lzDA0MPI:  
   } '`nf7b(  
   for(int index=0;index<MAX_KEY;index++){ VY|'7in"M  
    if(hCallWnd[index]==NULL) :'0.  
     continue; ziTE*rNJ  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) [.j&~\AG  
    { x=%wP VJ  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP); tEFbL~n  
     bProcessed=TRUE; b[s=FH]#N  
    } L }L"BY3$  
   } J,Rp&tavt:  
  } O ! iN  
  else if((lParam&0xc000ffff)==1){ //Key down &A!?:?3%O  
   switch(wParam) Mj5&vs~n;  
   { [wv;CUmgc  
    case VK_MENU: e WWtMnq  
     MaskBits|=ALTBIT; )N'rYS' 9  
     break; sRK oM  
    case VK_CONTROL: k|D =Q  
     MaskBits|=CTRLBIT; ,|G~PC8  
     break; I:Q3r"1  
    case VK_SHIFT: cfhiZ~."T  
     MaskBits|=SHIFTBIT; _k O<|ev  
     break; \;bDDTM  
    default: //judge the key and send message 8qF OO3c\V  
     break; *1c1XN<7  
   } e61e|hoX\  
   for(int index=0;index<MAX_KEY;index++) q)rxv7Iu\  
   { ]7DS>%m Y(  
    if(hCallWnd[index]==NULL) jWNF3\  
     continue; K zWqHq  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits)) M>g%wg7Ah  
    { i8|0zI  
     SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN); bTepTWv  
     bProcessed=TRUE; _y5J]Yu`j  
    }  O3~7  
   }  Xn=  
  } f{+n$ Cos  
  if(!bProcessed){ g?OC-zw  
   for(int index=0;index<MAX_KEY;index++){ 7+;CA+;  
    if(hCallWnd[index]==NULL) /k^!hI"4c  
     continue; WinwPn+9  
    if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0)) ?w5>Z/V  
     SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam); L|]!ULi$d  
   } B6J <  
  } >&`;@ZOH  
 } 94Q?)0W$  
 return CallNextHookEx( hHook, nCode, wParam, lParam ); *w5xC5*  
} *wp>a?sG\  
_Y _v&  
BOOL InitHotkey() q>f|1Pf  
{ fq4[/%6,O  
 if(hHook!=NULL){ JS2h/Y$  
  nHookCount++; Zt/4|&w  
  return TRUE; HVH<S  
 } 7v]9) W=y  
 else S2<evs1d  
  hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0); Lm1  -  
  if(hHook!=NULL) ESi'3mbeC  
   nHookCount++; /Xf_b.ZM&  
  return (hHook!=NULL); B x-"<^<  
} ,,+iPGa<  
BOOL UnInit() Wi<g  
{ CKy/gTN  
 if(nHookCount>1){ WWjc.A$  
  nHookCount--; ,.]1N:   
  return TRUE; D/&nEMp6  
 } \#7@"~<  
 BOOL unhooked = UnhookWindowsHookEx(hHook); J-5E# v  
 if(unhooked==TRUE){ eJ+@<+vr;x  
  nHookCount=0; [Ufx=BPx3  
  hHook=NULL; }UX0 eI4  
 } |f{(MMlj  
 return unhooked; u{8:VX  
} Bv{DZ?{s  
O/Mx $Q3re  
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) JyDg=%-$2  
{ V)jF]u~g  
 BOOL bAdded=FALSE; ,-`A6ehg  
 for(int index=0;index<MAX_KEY;index++){ ^^(!>n6r^  
  if(hCallWnd[index]==0){ d*R('0z{  
   hCallWnd[index]=hWnd; @XQItc<  
   HotKey[index]=cKey; 8>AST,  
   HotKeyMask[index]=cMask; V(wANvH  
   bAdded=TRUE; 0x,NMS  
   KeyCount++; hQ\W~3S55  
   break; HApjXv!U[  
  } 5ggsOqH  
 }  LOi/+;>  
 return bAdded; ,t@B]ll  
} ZVni'y m  
?5j}&Y3  
BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask) QE4TvnhK  
{ =58:e7(df  
 BOOL bRemoved=FALSE; 6rBP,\m  
 for(int index=0;index<MAX_KEY;index++){ 1<F6{?,z  
  if(hCallWnd[index]==hWnd){ ypLt6(1j%  
   if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){ d^qTY?k.  
    hCallWnd[index]=NULL; |"aop|  
    HotKey[index]=0; Ef\&3TcQ  
    HotKeyMask[index]=0; L]wk Ba  
    bRemoved=TRUE; &F~97F)A)  
    KeyCount--; YckLz01jh  
    break; )R6-]TkA_  
   } $0&<Jx  
  } s_ %LU:WC  
 } H:]'r5sw  
 return bRemoved; >)6k)$x%%  
} $ #bWh  
QC<O=<$Q[  
void VerifyWindow() bY}:!aR<mK  
{ w`X0^<Fv  
 for(int i=0;i<MAX_KEY;i++){ o:PdPuZVR  
  if(hCallWnd!=NULL){ "5@\"L  
   if(!IsWindow(hCallWnd)){ se*!OiOt  
    hCallWnd=NULL; 2Dw}o;1'  
    HotKey=0; X}ft7;Jpy  
    HotKeyMask=0; (w1$m8`=  
    KeyCount--; s(pNg?R  
   } d8J(~$tXQN  
  } n+D93d9LP  
 } +o|I@7f  
} Xk`'m[  
{xRO.699  
BOOL CHookApp::InitInstance() ,A[NcFdCB  
{ W.nr&yiQ  
 AFX_MANAGE_STATE(AfxGetStaticModuleState()); l#&\,T  
 hins=AfxGetInstanceHandle(); D_M73s!U  
 InitHotkey(); Kb~i9x&  
 return CWinApp::InitInstance(); #k|f%!-Vo  
} -0>s`ruor  
HQGH7<=Om  
int CHookApp::ExitInstance() 0aa&13!5  
{ TEQs9-Uy  
 VerifyWindow(); "L+NN|  
 UnInit(); @Px_\w  
 return CWinApp::ExitInstance(); yVt8QF!  
} [sZ ,nB/  
1s-=zs  
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "Bl6 ) qw  
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) =3|5=ZU034  
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ hH_\C.bL  
#if _MSC_VER > 1000 K'oy6$B  
#pragma once e]@ B61lc  
#endif // _MSC_VER > 1000 ^_t7{z%sA[  
jIjW +D`  
class CCaptureDlg : public CDialog +[7 DRT:  
{ K>_~|ZN1C8  
 // Construction 2#X>^LH  
 public: D2'J (  
  BOOL bTray; U*\ 1d  
  BOOL bRegistered; Zp+orc7  
  BOOL RegisterHotkey(); Cuc+9  
  UCHAR cKey; d,E2l~s  
  UCHAR cMask; #D^( dz*  
  void DeleteIcon(); VJS1{n=;k  
  void AddIcon(); "0m\y+%8  
  UINT nCount; $GQ{Ai:VwF  
  void SaveBmp(); #:8V<rc^  
  CCaptureDlg(CWnd* pParent = NULL); // standard constructor o3Z<tI8-V  
  // Dialog Data :czUOZ_  
  //{{AFX_DATA(CCaptureDlg) KqvM5$3  
  enum { IDD = IDD_CAPTURE_DIALOG }; nU/x,W[}  
  CComboBox m_Key; 8gJg7RxL  
  BOOL m_bControl; z-m:l;  
  BOOL m_bAlt; p4@0Dz`Q  
  BOOL m_bShift; ;CDa*(e  
  CString m_Path; ~ep^S^V+  
  CString m_Number;  t: 03  
  //}}AFX_DATA vz^=o'  
  // ClassWizard generated virtual function overrides { {+:Vy  
  //{{AFX_VIRTUAL(CCaptureDlg) <G#Q f|&  
 public: G \|P3j  
  virtual BOOL PreTranslateMessage(MSG* pMsg); &H/3@A3  
 protected: Cf.(/5X  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 3u oIYY  
  virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); :?:R5_Nd=  
  //}}AFX_VIRTUAL -SF50.[  
  // Implementation Qn \=P*j  
 protected: V3$zlzSm,  
  HICON m_hIcon; ~Gh9m ]b  
  // Generated message map functions ,e{1l   
  //{{AFX_MSG(CCaptureDlg) WD|pG;Gq  
  virtual BOOL OnInitDialog(); *~^M_wej  
  afx_msg void OnSysCommand(UINT nID, LPARAM lParam); Kza5_ 7p`L  
  afx_msg void OnPaint(); _ uZVlu@  
  afx_msg HCURSOR OnQueryDragIcon(); {cmV{ 4Yx  
  virtual void OnCancel(); \Wb3JQ)  
  afx_msg void OnAbout(); TE-(Zil\  
  afx_msg void OnBrowse(); v,c;dlg_  
  afx_msg void OnChange(); }i52MI1-XP  
 //}}AFX_MSG *R8P brN  
 DECLARE_MESSAGE_MAP() +oiuulA  
}; R]N"P:wf@  
#endif Lv@'v4.({  
y-_IMu.J`  
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 4YA1~7R  
#include "stdafx.h" !-tVt D  
#include "Capture.h" !=]cASPGD  
#include "CaptureDlg.h" @gi / 1cq  
#include <windowsx.h> E+P-)bRa  
#pragma comment(lib,"hook.lib") ^]9.$$GU\A  
#ifdef _DEBUG JPq' C$  
#define new DEBUG_NEW "LM[WcDX  
#undef THIS_FILE ,yTT,)@<  
static char THIS_FILE[] = __FILE__; v(l:N@L  
#endif Tz{-L%*#  
#define IDM_SHELL WM_USER+1 Oe&gTXo  
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); vY]7oX+  
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); E2Ec`o  
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 1WAps#b.  
class CAboutDlg : public CDialog |fPR7-  
{  )OZ  
 public: w%~Mg3|  
  CAboutDlg(); RC^k#+  
  // Dialog Data i)@H  
  //{{AFX_DATA(CAboutDlg) `Gh#2 U  
  enum { IDD = IDD_ABOUTBOX }; ,p6o "-  
  //}}AFX_DATA gt!t Du  
  // ClassWizard generated virtual function overrides 7w?N-Q$y  
  //{{AFX_VIRTUAL(CAboutDlg) G],W{<Pe  
 protected: |t_SN,)dd  
  virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Q\aC:68  
  //}}AFX_VIRTUAL ),Igu  
  // Implementation q }hHoSG]=  
 protected: ADB,gap  
  //{{AFX_MSG(CAboutDlg) v|:TYpku3  
  //}}AFX_MSG nw=:+?  
  DECLARE_MESSAGE_MAP() ZX0!BS  
}; du&9mOrr  
?;DzWCL~9  
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) hzrS_v  
{ l:j>d^V*&x  
 //{{AFX_DATA_INIT(CAboutDlg) B1 xlWdm  
 //}}AFX_DATA_INIT ?'^yw C`  
} U\6Ee-1#_  
h-5] nL3  
void CAboutDlg::DoDataExchange(CDataExchange* pDX) `A$zLqz)Vm  
{ T<U_Iq  
 CDialog::DoDataExchange(pDX); 2Jqr"|sw  
 //{{AFX_DATA_MAP(CAboutDlg) 66HxwY3a  
 //}}AFX_DATA_MAP Nh+XlgXG  
} ~;I'.TW  
8xYeaK  
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) E]ZIm  
 //{{AFX_MSG_MAP(CAboutDlg) 7%i6zP /a  
 // No message handlers 8 )= "Ee  
 //}}AFX_MSG_MAP Cf3<;Mp<  
END_MESSAGE_MAP() -o YJ&r  
9O-*iK  
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) c4M]q4]F  
: CDialog(CCaptureDlg::IDD, pParent) 1Wz5Iv#Ez  
{ 9KMtPBZ  
 //{{AFX_DATA_INIT(CCaptureDlg) I1W~;2cK  
  m_bControl = FALSE; <Gz*2i  
  m_bAlt = FALSE; +{cCKRm  
  m_bShift = FALSE; V(OD^GU  
  m_Path = _T("c:\\"); s;xErH@RA  
  m_Number = _T("0 picture captured."); k];fQ7}m<0  
  nCount=0; (ljoD[kZ  
  bRegistered=FALSE; e4 -7&8N+  
  bTray=FALSE; @"0n8y  
 //}}AFX_DATA_INIT A&:~dZ:%w  
 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32 e.]k4K  
 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); :YNXS;>)!  
} :@J.!dokF  
.p-T >  
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) [W=6NAd  
{ >/y+;<MZ  
 CDialog::DoDataExchange(pDX); ig4mj47wJ  
 //{{AFX_DATA_MAP(CCaptureDlg) /086qB|  
  DDX_Control(pDX, IDC_KEY, m_Key); yVH>Q-{  
  DDX_Check(pDX, IDC_CONTROL, m_bControl); ;D}E/' =  
  DDX_Check(pDX, IDC_ALT, m_bAlt); lA,*]Mr~  
  DDX_Check(pDX, IDC_SHIFT, m_bShift); YH{FTVOt{C  
  DDX_Text(pDX, IDC_PATH, m_Path); 3'[ g2JR  
  DDX_Text(pDX, IDC_NUMBER, m_Number); e# KP3Lp  
 //}}AFX_DATA_MAP :jGgX>GG  
} TTz_w-68  
>{=~''d,w  
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) P;ovPyoO  
//{{AFX_MSG_MAP(CCaptureDlg) DaqpveKa  
 ON_WM_SYSCOMMAND() @vvGhJ1m`  
 ON_WM_PAINT() 89J7hnJC  
 ON_WM_QUERYDRAGICON()  o*xft6U  
 ON_BN_CLICKED(ID_ABOUT, OnAbout) -\M;bQV[C  
 ON_BN_CLICKED(IDC_BROWSE, OnBrowse) idNg&'   
 ON_BN_CLICKED(ID_CHANGE, OnChange) Ui }%T]  
//}}AFX_MSG_MAP YBQ{/"v%|  
END_MESSAGE_MAP() ?$%2\"wX~7  
~s>Ud<l%r  
BOOL CCaptureDlg::OnInitDialog() _+. )8   
{ AmBLZ<f;  
 CDialog::OnInitDialog(); "K#zY~>L  
 ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); F"t.ND  
 ASSERT(IDM_ABOUTBOX < 0xF000); k4YW;6<C+  
 CMenu* pSysMenu = GetSystemMenu(FALSE); -qJO6OM  
 if (pSysMenu != NULL) Il$Jj-)  
 { 8Oo16LPD  
  CString strAboutMenu; nH|7XY9"  
  strAboutMenu.LoadString(IDS_ABOUTBOX); %Q|Hvjk=E  
  if (!strAboutMenu.IsEmpty()) a<&GsDw  
  { "SU O2-Gj  
   pSysMenu->AppendMenu(MF_SEPARATOR); )%~<EJ*&Z  
   pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); $J]o\~Z J  
  } Cm#[$T@C  
 } rIJd(=  
 SetIcon(m_hIcon, TRUE); // Set big icon 1IWP~G  
 SetIcon(m_hIcon, FALSE); // Set small icon =yLJGNK[  
 m_Key.SetCurSel(0); Ypw:Vp  
 RegisterHotkey(); nmUMg  
 CMenu* pMenu=GetSystemMenu(FALSE); )"f*Mp  
 pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); wQN/MYF[  
 pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); P30|TU+B  
 pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); pFwhv w  
 return TRUE; // return TRUE unless you set the focus to a control CF/8d6}Vf  
} z460a[Wl  
q 1+{MPJ  
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 4_h?E:sBb  
{ KNqs=:i  
 if ((nID & 0xFFF0) == IDM_ABOUTBOX) X>ck.}F  
 { '%[r9 w  
  CAboutDlg dlgAbout; ^"EK:|Y4%K  
  dlgAbout.DoModal(); yn.f?[G2  
 } <{1=4PA  
 else Pe?b# G  
 { 1ika'  
  CDialog::OnSysCommand(nID, lParam); 0-Vx!(  
 } M]A!jWtE  
} YCo qe,5  
}Z8DVTpX}  
void CCaptureDlg::OnPaint() GA2kg7  
{ H]Vo XJ\*  
 if (IsIconic()) 0Y9fK? (  
 { +cC$4t0$^A  
  CPaintDC dc(this); // device context for painting R9O1#s^  
  SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); Un\ T} c  
  // Center icon in client rectangle ^_JByB D  
  int cxIcon = GetSystemMetrics(SM_CXICON); Ep1p>s^  
  int cyIcon = GetSystemMetrics(SM_CYICON); .X{U\{c|a  
  CRect rect; @;h$!w<  
  GetClientRect(&rect); bSS=<G9  
  int x = (rect.Width() - cxIcon + 1) / 2; O@sJ#i>  
  int y = (rect.Height() - cyIcon + 1) / 2; a_o99lP  
  // Draw the icon z9HUI5ns  
  dc.DrawIcon(x, y, m_hIcon); v?`DP  
 } xc_-1u4a9  
 else TV*@h2C"i  
 { E{}Vi>@V?  
  CDialog::OnPaint(); Qk`LBvg1  
 } z*G(AcS)  
} 2t`d. s=  
R![4|FR  
HCURSOR CCaptureDlg::OnQueryDragIcon() z;6,,  
{ vlh$NK+F  
 return (HCURSOR) m_hIcon; m-XS_5x\  
} Vv3:x1S  
=;y(b~  
void CCaptureDlg::OnCancel() x aW9Sj0ZM  
{ X"O^4MnvI  
 if(bTray) Q7XlFjzcm  
  DeleteIcon(); {V5eHn9/Q'  
  CDialog::OnCancel(); <,I]=+A  
} FP9FE `x  
btWvoKO*  
void CCaptureDlg::OnAbout() dmk_xBy s|  
{ A!^gF~5  
 CAboutDlg dlg; <F-W fR  
 dlg.DoModal(); $gysy!2}.  
} H:.l:PJ  
MNd[Xzm  
void CCaptureDlg::OnBrowse() (5Sv$Xt  
{ \#q|.d$ u  
 CString str; CC.ri3+.  
 BROWSEINFO bi; OmAa$L,'w  
 char name[MAX_PATH]; AIw<5lW  
 ZeroMemory(&bi,sizeof(BROWSEINFO)); >^ zbDU1wT  
 bi.hwndOwner=GetSafeHwnd(); d^Zr I\AJ  
 bi.pszDisplayName=name; = `oGH  
 bi.lpszTitle="Select folder"; <F<jx"/)  
 bi.ulFlags=BIF_RETURNONLYFSDIRS; %M u$0~ct"  
 LPITEMIDLIST idl=SHBrowseForFolder(&bi); )m.U"giG++  
 if(idl==NULL) x$=""?dd  
  return; pDM95.6   
 SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); DE" Y(;S  
 str.ReleaseBuffer(); ?`U=Ps  
 m_Path=str; j=n<s</V  
 if(str.GetAt(str.GetLength()-1)!='\\') 9y(491"o  
  m_Path+="\\"; 7V-'><)gI  
 UpdateData(FALSE); !7jVKI80  
} dI) 9@UL  
X^9eCj;c  
void CCaptureDlg::SaveBmp() ":V,&o9n  
{ \2VYDBi?|  
 CDC dc; ysFp`  
 dc.CreateDC("DISPLAY",NULL,NULL,NULL); [WW ~SOJe  
 CBitmap bm; (I\qTfN4  
 int Width=GetSystemMetrics(SM_CXSCREEN); QBL|n+  
 int Height=GetSystemMetrics(SM_CYSCREEN); zt/N)5\V  
 bm.CreateCompatibleBitmap(&dc,Width,Height); 8N9X1Mb|  
 CDC tdc; <U~at+M  
 tdc.CreateCompatibleDC(&dc); ?"L ^ 0%  
 CBitmap*pOld=tdc.SelectObject(&bm);  NH0uK  
 tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); ~(K{D D7[N  
 tdc.SelectObject(pOld); 9jW"83*5  
 BITMAP btm; #0'%51Jcl  
 bm.GetBitmap(&btm); #7|73&u(  
 DWORD size=btm.bmWidthBytes*btm.bmHeight; raCgctYVq  
 LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); D%!GY1wdn  
 BITMAPINFOHEADER bih; F7IZ;4cp  
 bih.biBitCount=btm.bmBitsPixel; Q+a"Z^Z|  
 bih.biClrImportant=0; [ %6(1$Ih  
 bih.biClrUsed=0; D2MWrX  
 bih.biCompression=0; nV3I6  
 bih.biHeight=btm.bmHeight; jCp`woV  
 bih.biPlanes=1; ] 8dzTEjk  
 bih.biSize=sizeof(BITMAPINFOHEADER); W+u-M>Cj6  
 bih.biSizeImage=size; Y[Eq;a132  
 bih.biWidth=btm.bmWidth; IHcR/\mz  
 bih.biXPelsPerMeter=0; Uc d~-D  
 bih.biYPelsPerMeter=0; z` (">J  
 GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 0UOjk.~b  
 static int filecount=0; oJe`]_XZ  
 CString name; eH^~r{{R  
 name.Format("pict%04d.bmp",filecount++); *m*sg64Zw  
 name=m_Path+name; MeW?z|x`'  
 BITMAPFILEHEADER bfh; =gQ^,x0R9  
 bfh.bfReserved1=bfh.bfReserved2=0; olca Z  
 bfh.bfType=((WORD)('M'<< 8)|'B'); `PS>"-AY2  
 bfh.bfSize=54+size; w'7=CzfYn  
 bfh.bfOffBits=54; 5Sx.'o$  
 CFile bf; l' 2C/#8F  
 if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ lL"ANlX-P  
  bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ki'CW4x  
  bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); !8OgaMngzF  
  bf.WriteHuge(lpData,size); }) Zcw1g  
  bf.Close(); zLybf:#  
  nCount++; Zgt(zh_l  
 } TeNPuY~WP  
 GlobalFreePtr(lpData); +a0` ,Jc  
 if(nCount==1) *=zv:!  
  m_Number.Format("%d picture captured.",nCount); jzd)jJ0M  
 else M<'He.n  
  m_Number.Format("%d pictures captured.",nCount); ! q5qA*  
  UpdateData(FALSE); aDda&RM  
} uS7kkzt-x  
_(F8}s  
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) ubUVxYD?  
{ ]8CgHT[^7  
 if(pMsg -> message == WM_KEYDOWN) {fa3"k_ke  
 { P$5K[Y4f  
  if(pMsg -> wParam == VK_ESCAPE) VMH^jCFp  
   return TRUE; 20cEE>  
  if(pMsg -> wParam == VK_RETURN) .JX9(#Uk  
   return TRUE; e-*-91D  
 } do:IkjU~  
 return CDialog::PreTranslateMessage(pMsg); ?}"39n  
} ' wni.E&  
h&2l0 |8k  
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) fi  [4F  
{ %jn)=;\  
 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ \gR%PN  
  SaveBmp(); v"-K-AQjB  
  return FALSE; <h%I-e6  
} 0t7vg#v|  
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ Z7p!YTA  
 CMenu pop; 8\Bb7*  
 pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); K/M2L&C  
 CMenu*pMenu=pop.GetSubMenu(0); A\<W x/  
 pMenu->SetDefaultItem(ID_EXITICON); I &;9  
 CPoint pt; .?kq\.rQ  
 GetCursorPos(&pt); OJ r~iUr  
 int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); Go(Td++HS  
 if(id==ID_EXITICON) ]i\;#pj}  
  DeleteIcon(); n&3}F?   
 else if(id==ID_EXIT) z]R%'LGu  
  OnCancel(); Y`rli  
 return FALSE; nt8& Mf  
} w|c200Is}e  
LRESULT res= CDialog::WindowProc(message, wParam, lParam); iF Zqoz  
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Oi<yT"7  
 AddIcon(); 5i+cjT2  
 return res; XIn,nCY;  
} %Ni"*\  
5GbC}y>  
void CCaptureDlg::AddIcon() xJ9aFpTC  
{ LkXho>y  
 NOTIFYICONDATA data; ;Vpp1mk|  
 data.cbSize=sizeof(NOTIFYICONDATA); Lg{M<Q)4  
 CString tip; }:57Ym)7w  
 tip.LoadString(IDS_ICONTIP); 7 j6<  
 data.hIcon=GetIcon(0); B>g(i=E  
 data.hWnd=GetSafeHwnd(); u9fJ:a  
 strcpy(data.szTip,tip); y/+ IPR  
 data.uCallbackMessage=IDM_SHELL; f+1@mGt  
 data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; ?AK`M #M  
 data.uID=98; J4u>77I  
 Shell_NotifyIcon(NIM_ADD,&data); [0vqm:P  
 ShowWindow(SW_HIDE); IKV!0-={!z  
 bTray=TRUE; 0o!mlaU#  
} nJ h)iQu  
3S" /l  
void CCaptureDlg::DeleteIcon() ,B'fOJ.2  
{ .y<u+)  
 NOTIFYICONDATA data; |}b~YHTs  
 data.cbSize=sizeof(NOTIFYICONDATA); ,Oe:SZJ>  
 data.hWnd=GetSafeHwnd(); -iL:D<!Cb_  
 data.uID=98; <~P!yLr  
 Shell_NotifyIcon(NIM_DELETE,&data); %OOkPda  
 ShowWindow(SW_SHOW); KD.|oo  
 SetForegroundWindow(); qA"BoSw4  
 ShowWindow(SW_SHOWNORMAL); Q-z `rW  
 bTray=FALSE; :W;eW%Y  
} ;Y0M]pC  
W4UK?#S+  
void CCaptureDlg::OnChange() {@6:kkd  
{ sNM ]bei  
 RegisterHotkey(); ~d\^ynQ  
} t YxN^VqU  
sUU[QP-  
BOOL CCaptureDlg::RegisterHotkey() FbRGfHL[  
{ X9ZHYlr+Q  
 UpdateData(); tQas_K5  
 UCHAR mask=0; KWojMPs  
 UCHAR key=0; RLZfXXMn  
 if(m_bControl) |<'6rJ[i>  
  mask|=4; [>t;P ,  
 if(m_bAlt) ]|tR8`DGZ%  
  mask|=2; `][vaLd`Q  
 if(m_bShift) h ,n}=g+?  
  mask|=1; .+kg1=s  
  key=Key_Table[m_Key.GetCurSel()]; S`$%C=a.  
 if(bRegistered){ x-]:g&5T  
  DeleteHotkey(GetSafeHwnd(),cKey,cMask); t+_\^Oa)  
  bRegistered=FALSE; <ZheWl  
 } (cyvE}g  
 cMask=mask; 6l[ v3l"t  
 cKey=key; `So/G  
 bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); +(PUiiP'"v  
 return bRegistered; *ow`}Q  
} XwFTAaZ  
.]s? 01Z  
  四、小结 >]8(3&zd  
s1h|/7gG  
  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