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:
lt$797
'LOqGpmVc 一、实现方法
^GAdl} (G"qIw
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:
*c%@f<R~ _F*w
,b$8 #pragma data_seg("shareddata")
2lSM`cw HHOOK hHook =NULL; //钩子句柄
FEZ6X UINT nHookCount =0; //挂接的程序数目
KGWENX_U static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
q%'ovX(dm static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
395o[YZx* static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
$ i&$ZdX static int KeyCount =0;
5]Ra?rF static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
`MwQ6%lf #pragma data_seg()
Gzfb|9,q R] [M_ r 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
hHg
gH4T &59#$LyH`% 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:
6^aYW#O<Ua *~cs8<.!1 BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
e>>G4g cKey,UCHAR cMask)
ICTtubjV" {
bSR<d BOOL bAdded=FALSE;
[s34N+vU for(int index=0;index<MAX_KEY;index++){
0B4(t6o if(hCallWnd[index]==0){
=c.q]/M hCallWnd[index]=hWnd;
"^=[*i HotKey[index]=cKey;
9e)+<H HotKeyMask[index]=cMask;
d-<y'GYw
bAdded=TRUE;
h.9Lh ;j KeyCount++;
oe*&w9Y}& break;
yki
k4MeB }
IX*S:7S[ }
~fF} return bAdded;
\O8f~zA{G }
mc+wRx //删除热键
GufP[|7b- BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
R>U<8z"i {
sKuTG93sr@ BOOL bRemoved=FALSE;
)ra66E for(int index=0;index<MAX_KEY;index++){
,1[??Y if(hCallWnd[index]==hWnd){
3.0c/v5Go if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
)c '>E4> hCallWnd[index]=NULL;
by
U\I5 HotKey[index]=0;
eE{L>u HotKeyMask[index]=0;
`I>K? bRemoved=TRUE;
xI:
'Hk1 KeyCount--;
+.lWck break;
huoKr }
XeSbA }
?R]y}6P$ }
Doh|G:P]# return bRemoved;
e8 7-
B1` }
Y+
Z9IiS7 $
tNhwF !:<UgbiVv DLL中的钩子函数如下:
M&ij[%i &a=e=nR5 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
7ILa H|eN {
3NN'E$"3 BOOL bProcessed=FALSE;
J4}\V$ysN if(HC_ACTION==nCode)
--twkD {
]pV1T if((lParam&0xc0000000)==0xc0000000){// 有键松开
= b!J)] switch(wParam)
ww($0A`ek {
y<1$^Y1/) case VK_MENU:
Z&w^9;30P MaskBits&=~ALTBIT;
w;EXjl;X O break;
-p.*<y case VK_CONTROL:
(<3lo
ZaX MaskBits&=~CTRLBIT;
lZM3Q58?\ break;
KF_Wu}q
d case VK_SHIFT:
^A[`NYK MaskBits&=~SHIFTBIT;
'98h<(@] break;
8}{o2r@ default: //judge the key and send message
d `kM0C break;
gww^?j# }
vNt>ESPB for(int index=0;index<MAX_KEY;index++){
=_=Z;#`cXk if(hCallWnd[index]==NULL)
HQ3`:l continue;
!1'-'Q@f if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
R2O.}!' {
a9Fm Y` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
x"8ey|@&, bProcessed=TRUE;
pfZ,t<bE2 }
K` ,d$ }
(bx\4Ws }
e4Ox`gLa*p else if((lParam&0xc000ffff)==1){ //有键按下
B^_Chj*m switch(wParam)
PGPbpl&\t {
"q^#39i? case VK_MENU:
S[~O') MaskBits|=ALTBIT;
cN WcNMm break;
Px#QZZ case VK_CONTROL:
[Hj'nA^ MaskBits|=CTRLBIT;
LBkc s4+ break;
q Iy^N:C2' case VK_SHIFT:
EotwUT| MaskBits|=SHIFTBIT;
e?| URW break;
J`q}Ry; default: //judge the key and send message
Yv>BOK break;
~$4.Mf,u }
aGe(vQPi9 for(int index=0;index<MAX_KEY;index++){
"P'&+dH8 if(hCallWnd[index]==NULL)
e:J'&r& 1 continue;
l^!A if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-#wVtXaSc {
G|-\T(&J SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
6"i{P bProcessed=TRUE;
:Jeo_}e 0 }
@mx$sNDkL }
\$'m^tVU }
7y)=#ZG'R if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
x$n~f:1Y for(int index=0;index<MAX_KEY;index++){
7<:Wq=e!r if(hCallWnd[index]==NULL)
3_MS'&M continue;
AzW7tp;t= if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
qEJ8o.D-= SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
u\XkXS` //lParam的意义可看MSDN中WM_KEYDOWN部分
8pPC 9ew\= }
Hs%QEvZl }
< m enABN4 }
x_<bK$OU return CallNextHookEx( hHook, nCode, wParam, lParam );
n#>.\F }
vK6ibl0 /c@*eU 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:
>7nV$.5S V3mjbH>F BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
*IWFeu7y BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
sLG>>d3R1 'B3Wz a. 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
#P%1{l5m A~SL5h LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
*
-KJh_ {
+YkW[a\4 if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
l
Io9,Ke {
F#1 Kk#t //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
1l+kO,X] SaveBmp();
Z'Exw-ca return FALSE;
ACigeK^C}E }
Q1`<fD
…… //其它处理及默认处理
6F*-qb3 }
rFmKmV /5Zp-Pq ]<kupaRQ 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
S jVsF1d_ X,TTM,1w 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
@S}/g/+2 )sW6iR&_i 二、编程步骤
7uPZuXHxcu r$GPYyHK 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";
l'*^$qc /l,+oG%\ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
?P""KVpo )bLGEmm 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
"1XXE3^^ VG_uxKY 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
+0XL5('2 =db'#m{$ 5、 添加代码,编译运行程序。
`^7:7Wr]= wMb)6YZs 三、程序代码
CmEpir{}( ,3Wb4so ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
zL:&Q< #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
ZV'$k\ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
Rx6l|'e #if _MSC_VER > 1000
TB7>s~)47E #pragma once
%G;0T;0L #endif // _MSC_VER > 1000
_wf5%(~b #ifndef __AFXWIN_H__
b?_e+:\UV #error include 'stdafx.h' before including this file for PCH
Ih.rC>)rx #endif
h+,'B&=|_ #include "resource.h" // main symbols
d_Q*$Iz)3 class CHookApp : public CWinApp
#zON_[+s9 {
qWsylC23 public:
>Z+"`"^o} CHookApp();
m\>|C1oRy // Overrides
q0,kDM66 // ClassWizard generated virtual function overrides
I=K!)X$ //{{AFX_VIRTUAL(CHookApp)
NO-k- public:
'lJEHz\ virtual BOOL InitInstance();
?X\3&Ujy$ virtual int ExitInstance();
'X7%35Y //}}AFX_VIRTUAL
>i
"qMZ //{{AFX_MSG(CHookApp)
CRH{E}> // NOTE - the ClassWizard will add and remove member functions here.
#6Jc}g<?g // DO NOT EDIT what you see in these blocks of generated code !
x_*%*H //}}AFX_MSG
^SZw`] DECLARE_MESSAGE_MAP()
*~p(GC };
!^m%O0DT LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
8b|OXWl BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
u!Xb?:3uj BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
&
_; y.! BOOL InitHotkey();
YT>KJ BOOL UnInit();
z{S:X:X #endif
'|A|vCRCG TG}d3ZU
! //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
%$@1FlqX; #include "stdafx.h"
j'K38@M:MN #include "hook.h"
F{<5aLaYti #include <windowsx.h>
!p9)CjQ " #ifdef _DEBUG
I>PZYh'.T #define new DEBUG_NEW
U@G"`RYl #undef THIS_FILE
5?WYsj"
static char THIS_FILE[] = __FILE__;
HcRa`Sfc]/ #endif
LL&ud_Y #define MAX_KEY 100
qO-9
x0v# #define CTRLBIT 0x04
/<);=&[ #define ALTBIT 0x02
[4sEVu} #define SHIFTBIT 0x01
y$X(S\W #pragma data_seg("shareddata")
xJ{_qP HHOOK hHook =NULL;
vY6oVjM UINT nHookCount =0;
v??TJ^1 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
,LDm8 static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
x H-X|N static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
f-Jbs`(+ static int KeyCount =0;
ohUdGO[/ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
:ygWNK[6D #pragma data_seg()
A{# Nwd> HINSTANCE hins;
"(v%1tGk void VerifyWindow();
VYZU eh BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
r9#
\13- //{{AFX_MSG_MAP(CHookApp)
bLzs?eos // NOTE - the ClassWizard will add and remove mapping macros here.
Mi+H#xx16 // DO NOT EDIT what you see in these blocks of generated code!
+#2)kg 9_ //}}AFX_MSG_MAP
dBSbu=^$ ) END_MESSAGE_MAP()
k.<3HU ?38lHn`FyQ CHookApp::CHookApp()
F]UQuOR) {
';0 qj$# // TODO: add construction code here,
glj7$ // Place all significant initialization in InitInstance
>I}9LyZt }
xl(@C*.sC1 `s|]"'rX CHookApp theApp;
<Mx0\b! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
[}OgSP9i {
ndink$ BOOL bProcessed=FALSE;
F>zl9Vi< if(HC_ACTION==nCode)
qFco3 {
hn.bau[ if((lParam&0xc0000000)==0xc0000000){// Key up
$Az^Y0[D switch(wParam)
t42u b {
9T7e\<8"vC case VK_MENU:
CS 8jA\ MaskBits&=~ALTBIT;
TX}T|ri break;
\ \06T` case VK_CONTROL:
\P;rES' MaskBits&=~CTRLBIT;
l.`u5D break;
.~>?*} case VK_SHIFT:
j~E",7Q' MaskBits&=~SHIFTBIT;
20b<68h$: break;
Fk"Ee&H)( default: //judge the key and send message
hoM|P8
}rh break;
k1^\| }
8'Z:ydj^, for(int index=0;index<MAX_KEY;index++){
]0c+/ \b& if(hCallWnd[index]==NULL)
iDoDwq!l_ continue;
#*9-d/K if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
7I=C+ {
:XG;ru%i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
3*ixlO:qGk bProcessed=TRUE;
26 I }
foRD{Hx }
JTU#vq:TY }
vAb^]d else if((lParam&0xc000ffff)==1){ //Key down
FOwnxYGVf switch(wParam)
YO+{,$ {
c$:1:B9\ case VK_MENU:
X(A.X:" MaskBits|=ALTBIT;
S0d~.ah30 break;
N~^yL <O case VK_CONTROL:
{2&m`Dbm MaskBits|=CTRLBIT;
,](:<A)W& break;
#3$\Iu case VK_SHIFT:
K+Y^>N 4m MaskBits|=SHIFTBIT;
-d+aV1n break;
oVvc?P default: //judge the key and send message
2S"Nf8>zp break;
D&G"BZx| }
s 5WqR8 for(int index=0;index<MAX_KEY;index++)
JL=U,Mr6 {
bWWXc[O2&( if(hCallWnd[index]==NULL)
%FZ2xyI. continue;
6e,xDr if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.IarkeCtb {
K+*Q@R D SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
;5_{MCPM bProcessed=TRUE;
*\}}Bv+9 }
mLh kI!4[ }
=( v^5 }
O.G'?m<:# if(!bProcessed){
O.`Jl% for(int index=0;index<MAX_KEY;index++){
1Xu?(2;NF if(hCallWnd[index]==NULL)
*&BnF\?m continue;
V7d)S&*V if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Z@a9mFI? SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
E/M_lvQ }
KRAcnY;u }
dCyqvg6u }
: _e# return CallNextHookEx( hHook, nCode, wParam, lParam );
Byl^?5 }
?BA]7M(,4 bmgn cwlz BOOL InitHotkey()
$+JS&k/'m {
&H}r%%|A if(hHook!=NULL){
Wj|alH9< nHookCount++;
az0<5Bq) return TRUE;
}jH7iyjD }
,DdB^Ig<r else
E`int?C! hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
$YxBE`)d- if(hHook!=NULL)
(*}yjUYLZ nHookCount++;
j9Ybx# return (hHook!=NULL);
^G&3sF} }
@"a6fn BOOL UnInit()
hu_ ^OlF {
q<y#pL=k"* if(nHookCount>1){
W1fW}0
nHookCount--;
m!<i0thJ return TRUE;
m>USD?i }
w(ln5q BOOL unhooked = UnhookWindowsHookEx(hHook);
<q*oV if(unhooked==TRUE){
**9x?s nHookCount=0;
n0Y+b[+wj hHook=NULL;
_Zk{! }
$mf
u:tbP return unhooked;
,.eWQK~ }
FZjHw_pP lC:k7<0Ji BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
[Wd-Zn% {
]Chj T} BOOL bAdded=FALSE;
rX_@Ihv' for(int index=0;index<MAX_KEY;index++){
X%z }VA if(hCallWnd[index]==0){
+$4(zPs@ hCallWnd[index]=hWnd;
L,y6^J! HotKey[index]=cKey;
8n1'x; HotKeyMask[index]=cMask;
!cKz7?w bAdded=TRUE;
B9p?8.[ KeyCount++;
s { #3r break;
Uc/+gz
Z; }
mc=LP>uoS }
DPi_O{W> return bAdded;
5T sU Qc }
J+rCxn?;g V5+SWXZ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
HhO".GA {
A-:O`RK BOOL bRemoved=FALSE;
5F`;yh+e for(int index=0;index<MAX_KEY;index++){
KiG p[eb if(hCallWnd[index]==hWnd){
c/c$D;T if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
}Zl&]e hCallWnd[index]=NULL;
21k5I #U HotKey[index]=0;
r0p w_j HotKeyMask[index]=0;
YK|bXSA[ bRemoved=TRUE;
[MuEoWrq(} KeyCount--;
t78k4? break;
I*9e]m" }
x.Q&$# }
@lJzr3}WZ }
<ZU=6Hq return bRemoved;
Gt9&)/# }
O=u1u}CP? o7IxJCL=Q void VerifyWindow()
hig2
{
[+O"<Ua for(int i=0;i<MAX_KEY;i++){
GfM;saTz{ if(hCallWnd
!=NULL){ j
";2o(
if(!IsWindow(hCallWnd)){ (sVi\R
hCallWnd=NULL; u2
`b'R9
HotKey=0; f~ }H
HotKeyMask=0; UH3sH
t
KeyCount--; ~]ZpA-*@Ut
} [@yV!#2
} R<B7K?SxV~
}
}fp-5
} s-dLZ.9F
JN7k 2]{
BOOL CHookApp::InitInstance() R8.CC1Ix
{ @A)R_p
AFX_MANAGE_STATE(AfxGetStaticModuleState()); JxyB(
hins=AfxGetInstanceHandle(); )BRKZQN
InitHotkey(); T#bu
V
return CWinApp::InitInstance(); 42]pYm(jk3
} z=$jGL
y"Nsh>h
int CHookApp::ExitInstance() sXNb }gJ
{ *L!!]Q2c
VerifyWindow(); aL\nT XakX
UnInit(); #r3l[bKK
return CWinApp::ExitInstance(); !
!PYP'e
} 8i?l02
G7D2{J{1
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file LzYO$Ir:g
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) $0arz{Oh
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ k__$Q9qj(
#if _MSC_VER > 1000 _'#x^D
#pragma once IgC}&
#endif // _MSC_VER > 1000 dg^L=
(ND4Q[*6
class CCaptureDlg : public CDialog )#LpCM,a
{ [~&XL0
// Construction H{t_xL)k.
public: Znetzm=0
BOOL bTray; 8/K!SpM*d
BOOL bRegistered; ^Idle*+
BOOL RegisterHotkey(); $ Y 7c
UCHAR cKey; JsotOic%
UCHAR cMask; `%j~|i)4
void DeleteIcon(); e)?Fi
void AddIcon(); Q);n<Z:X~
UINT nCount; A19;1#$=
void SaveBmp(); vVE7fq3
CCaptureDlg(CWnd* pParent = NULL); // standard constructor aH#l9kCb
// Dialog Data u a\,->
//{{AFX_DATA(CCaptureDlg) sdS^e`S
enum { IDD = IDD_CAPTURE_DIALOG }; B*E2.\~
CComboBox m_Key; ,k G>?4
BOOL m_bControl; w}CmfR
BOOL m_bAlt; ~(]0k.\
BOOL m_bShift; w;l<[q?_
CString m_Path; Y F*OU"2U
CString m_Number; Reu*Pe
//}}AFX_DATA *OyHHq|>q
// ClassWizard generated virtual function overrides +b3^.wkq
//{{AFX_VIRTUAL(CCaptureDlg) r
6Q Q
public: %E_b'[8
virtual BOOL PreTranslateMessage(MSG* pMsg); B^^r\L9
protected: *@TZ+{t
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 9+keX{/c
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); S~Id5T:,
//}}AFX_VIRTUAL ^H6<Km
l/V
// Implementation B7"PIkk;
protected: @}:uu$OH
HICON m_hIcon; 4WB-Ec
// Generated message map functions kQ
//{{AFX_MSG(CCaptureDlg) m:hY`[ f6
virtual BOOL OnInitDialog(); uWrQ&}@
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); _$>pw<
afx_msg void OnPaint(); EJ`T$JD
afx_msg HCURSOR OnQueryDragIcon(); Sv;_HZ
virtual void OnCancel(); $O^v]>h
afx_msg void OnAbout(); P<K){V
afx_msg void OnBrowse(); F9*g=
afx_msg void OnChange(); %K]euEqs
//}}AFX_MSG =v*.p=r
DECLARE_MESSAGE_MAP() 03j]d&P%d
}; %N#%|2B
#endif O3CFme
b<]n%Q'n
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file :EHJ\+kejX
#include "stdafx.h" b2@VxdFN
#include "Capture.h" WF\)fc#;_o
#include "CaptureDlg.h" ,y%3mR_~
#include <windowsx.h> !s@Rok
#pragma comment(lib,"hook.lib") !!o8N<NU
#ifdef _DEBUG HD N9.5S
#define new DEBUG_NEW wW"z
#undef THIS_FILE \RVW
static char THIS_FILE[] = __FILE__; nbG/c80
#endif @X3{x\i'I
#define IDM_SHELL WM_USER+1 D13Rx 6b
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); rcGb[=B f
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); 2[gFkyqe
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; ykrr2x
class CAboutDlg : public CDialog @JW@-9/
{ 4ikd M/
public: "YB**Y
CAboutDlg(); ?3O9eZY@
// Dialog Data C4}*)a
//{{AFX_DATA(CAboutDlg) YSaJeU>@
enum { IDD = IDD_ABOUTBOX }; D/=5tOy
//}}AFX_DATA mR;qMX)0h
// ClassWizard generated virtual function overrides @zgdq
//{{AFX_VIRTUAL(CAboutDlg) SwU\
q]^|Z
protected: \(">K
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support {Ha8]y
//}}AFX_VIRTUAL KzQ3.)/q
// Implementation ]QuM<ms
protected:
=~I-]4
//{{AFX_MSG(CAboutDlg) IuZ) [*W
//}}AFX_MSG .SWt3|Pi5
DECLARE_MESSAGE_MAP() 2y%,p{="
}; mYc.x
7u[j/l,
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Gy[O)PEEh
{ 3/#:~a9Q
//{{AFX_DATA_INIT(CAboutDlg) cJgBI(S5
//}}AFX_DATA_INIT ,TRTRb;
} \u&_sBLKV
.%zy`n
void CAboutDlg::DoDataExchange(CDataExchange* pDX) GQ_p-/p
R
{ \cLSf=
CDialog::DoDataExchange(pDX); 0<TD/1wN
//{{AFX_DATA_MAP(CAboutDlg) GHQ;hN:
//}}AFX_DATA_MAP kPjd_8z2n
} ``A 0WN
r_YIpnJ
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 7#<c>~
//{{AFX_MSG_MAP(CAboutDlg) w{dIFvQ"$
// No message handlers |7KeR-
//}}AFX_MSG_MAP x3rlJs`$;
END_MESSAGE_MAP() )NR Q2
BA=,7 y&;j
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) ]m#5`zGK1|
: CDialog(CCaptureDlg::IDD, pParent) e:AHVepj{
{ {s3z"OV
//{{AFX_DATA_INIT(CCaptureDlg) 8UkKU_Uso
m_bControl = FALSE; 0R0{t=VJZ
m_bAlt = FALSE; LB/C-n.`
m_bShift = FALSE; pN\Vr8tJ
m_Path = _T("c:\\"); >E,U>@+
m_Number = _T("0 picture captured."); m4:^}O-#
nCount=0; T}3v(6ew4
bRegistered=FALSE; t!K*pM
bTray=FALSE; 9dzdrT
//}}AFX_DATA_INIT wDwH.~3!
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ?RzD Qy D
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); kw`WH)+F
} )+H[kiN
k0Ek:MjJr
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) nv<` K9d
{ B-d(@7,1
CDialog::DoDataExchange(pDX); *6BThvg|&X
//{{AFX_DATA_MAP(CCaptureDlg) R4Rb73o
DDX_Control(pDX, IDC_KEY, m_Key); k-*Mzm]kb
DDX_Check(pDX, IDC_CONTROL, m_bControl); yFhB>i
DDX_Check(pDX, IDC_ALT, m_bAlt); e5Mln!.o
DDX_Check(pDX, IDC_SHIFT, m_bShift); d`d0N5\
DDX_Text(pDX, IDC_PATH, m_Path); A?Wk
wf
DDX_Text(pDX, IDC_NUMBER, m_Number); \ (p{t
//}}AFX_DATA_MAP ,_ag;pt9)
} d1joVUYE
_8G>&K3T<
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g+PPW88P;
//{{AFX_MSG_MAP(CCaptureDlg) TEsnN i
1
ON_WM_SYSCOMMAND() _ q(Q
ON_WM_PAINT() )IT6vU"-yd
ON_WM_QUERYDRAGICON() k'_ P7
ON_BN_CLICKED(ID_ABOUT, OnAbout) $OVXk'cc
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) xLZd!>C
ON_BN_CLICKED(ID_CHANGE, OnChange) #%@MGrsK
//}}AFX_MSG_MAP u-"c0@
END_MESSAGE_MAP() -=698h*
htP|3 B
BOOL CCaptureDlg::OnInitDialog() 1nPZ<^A&@
{ w{ `|N$
CDialog::OnInitDialog(); ^nVl (^{
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
_GqS&JHSf
ASSERT(IDM_ABOUTBOX < 0xF000); n-QJ;37\
CMenu* pSysMenu = GetSystemMenu(FALSE); eo^/c+FG
if (pSysMenu != NULL) $j)hNWI
{ 2AVc?
9@
CString strAboutMenu; -RJE6~>'\
strAboutMenu.LoadString(IDS_ABOUTBOX); &Np9kIMCB
if (!strAboutMenu.IsEmpty()) @/%{15s.
{ <5@PWrU?[[
pSysMenu->AppendMenu(MF_SEPARATOR); nW?R"@Zm
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); YwH./)r=
} <Q<+4Y{R
} 3z;_KmM
SetIcon(m_hIcon, TRUE); // Set big icon 7+w'Y<mJ
SetIcon(m_hIcon, FALSE); // Set small icon H(Ms^8Vs~:
m_Key.SetCurSel(0); A>.2OC+
RegisterHotkey(); ji+{ :D
CMenu* pMenu=GetSystemMenu(FALSE); !MQN H
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); Eaad,VBtU
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Ml>( tec
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); (Y(E%
return TRUE; // return TRUE unless you set the focus to a control @;wzsh >o
} dV 8iwI
x O7IzqY
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) rsa&Oo
D>
{ )R{UXk3q}
if ((nID & 0xFFF0) == IDM_ABOUTBOX) jw6Tj;c
{ 7 gB{In0
CAboutDlg dlgAbout; /)uM[ dnai
dlgAbout.DoModal(); NE|[o0On
} GbU@BN+_
else ^+?|Qfi
{ )y7_qxwbV
CDialog::OnSysCommand(nID, lParam); ;LJ3c7$@lf
} t^EhE
} d`Q7"}uZ
6Gn4asoA
void CCaptureDlg::OnPaint() > 7`&0?
{ Gt/4F-Gn
if (IsIconic()) #k5#j4!b
{ }fhHXGK.
CPaintDC dc(this); // device context for painting :6;e\UE
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ?a/n<V '
// Center icon in client rectangle UEz i*"-v2
int cxIcon = GetSystemMetrics(SM_CXICON); !d9AG|
int cyIcon = GetSystemMetrics(SM_CYICON); 9>,Qgp,w
CRect rect; K^%-NyV
GetClientRect(&rect); u@FsLHn
int x = (rect.Width() - cxIcon + 1) / 2; m(sXk}e;1
int y = (rect.Height() - cyIcon + 1) / 2; N~,_`=yRx
// Draw the icon >Cd9fJ&0gP
dc.DrawIcon(x, y, m_hIcon); +C7T]&5s
} O2-M1sd$
else MmU%%2QG
{ Uedvc5><t
CDialog::OnPaint(); nq`q[KV:
} (&&87(
} : cp
[~Hg}-c
HCURSOR CCaptureDlg::OnQueryDragIcon() 0o&}mKe
{ .6T6 S
v
return (HCURSOR) m_hIcon; 2Eh@e([PMs
} SlT*C6f
=;c_} VY
void CCaptureDlg::OnCancel() xQt 3[(Z
{ a}.Y!O&
if(bTray) : \V,k~asl
DeleteIcon(); E1>/R
CDialog::OnCancel(); m[2'd
} S-E++f9D~
6 o[/F3`
void CCaptureDlg::OnAbout() ,&a`d}g&G
{ =g@9>3~{!
CAboutDlg dlg; 7S2C /f
dlg.DoModal(); WBppKj_M
} W$\X ~Q'0
jv}=&d
void CCaptureDlg::OnBrowse() w;`m- 9<Y
{ u39FN?<^
CString str; "zV']A>4H
BROWSEINFO bi; ?9U:g(v
char name[MAX_PATH]; @Y'I,e
ZeroMemory(&bi,sizeof(BROWSEINFO)); [wcA.g* F
bi.hwndOwner=GetSafeHwnd(); oP$kRfXS!<
bi.pszDisplayName=name; Z}cIA87U
bi.lpszTitle="Select folder"; "xwM+ AC
bi.ulFlags=BIF_RETURNONLYFSDIRS; lg/sMF>z\f
LPITEMIDLIST idl=SHBrowseForFolder(&bi); q=Xg*PM,
if(idl==NULL) A1JzW)B
return; h$h]%y
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Ge}$rLu]0
str.ReleaseBuffer(); Ob&W_D^=N
m_Path=str; y' tRANxQ
if(str.GetAt(str.GetLength()-1)!='\\') $@87?Ab
m_Path+="\\"; UxPGv;F
UpdateData(FALSE); -ID!pT vW
}
Q&+c.S
M4<+%EV}
void CCaptureDlg::SaveBmp() kr_oUXiX
{ I($,9|9F
CDC dc; yU`:IMz
dc.CreateDC("DISPLAY",NULL,NULL,NULL); \C\gn]Z
CBitmap bm; 8Uj:
int Width=GetSystemMetrics(SM_CXSCREEN); {
R*Y=Ie
int Height=GetSystemMetrics(SM_CYSCREEN); >C2HC6O3
bm.CreateCompatibleBitmap(&dc,Width,Height); +J40wFI:y
CDC tdc; -^fzsBL.
tdc.CreateCompatibleDC(&dc); 1~qm+nET\
CBitmap*pOld=tdc.SelectObject(&bm); d/B*
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); BRtXf0~&p
tdc.SelectObject(pOld); *h,3}\
BITMAP btm; vw
rRZ"2
bm.GetBitmap(&btm); @6%gIsj<H
DWORD size=btm.bmWidthBytes*btm.bmHeight; 2YIF=YWO},
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); G)+Ff5e0L[
BITMAPINFOHEADER bih; iB{xvyR
bih.biBitCount=btm.bmBitsPixel; mmN|F$;r
bih.biClrImportant=0; 2NR7V*A
bih.biClrUsed=0; 4_<
nQ9K
bih.biCompression=0; 4[l^0
bih.biHeight=btm.bmHeight; <P pYl
bih.biPlanes=1; U(3(ZqP
bih.biSize=sizeof(BITMAPINFOHEADER); 9A*rE.B+W
bih.biSizeImage=size; DNho%Xk
bih.biWidth=btm.bmWidth; 9 }n,@@
bih.biXPelsPerMeter=0; W8.j/K:
bih.biYPelsPerMeter=0; 2
zl~>3S
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1#!@["
static int filecount=0; oWrE2U;
CString name; 83?1<v0%
name.Format("pict%04d.bmp",filecount++); X<K9L7/*
name=m_Path+name; ^n71'MW
BITMAPFILEHEADER bfh; <UAP~RH{
bfh.bfReserved1=bfh.bfReserved2=0; QE6El'S
bfh.bfType=((WORD)('M'<< 8)|'B'); :C}H y
bfh.bfSize=54+size; yam}x*O\xn
bfh.bfOffBits=54; BA`:miH<
CFile bf; UG=I~{L
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ #L1>dHhat
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); ,9UCb$mh
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); zn[QvY
bf.WriteHuge(lpData,size); '8Qw:f h
bf.Close(); !Ud:?U
nCount++; E.#6;HHzN
} Xv*}1PZH
GlobalFreePtr(lpData); )[ w&C_>]
if(nCount==1) \Jf9npz3
m_Number.Format("%d picture captured.",nCount); 9mm2V ps;
else O99mic
m_Number.Format("%d pictures captured.",nCount); x.G"D(
UpdateData(FALSE); u
!.DnKu
} B<C&ay
/.2u.G
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) e7's)C>/'
{ eRVY.E<
if(pMsg -> message == WM_KEYDOWN) |=,83,a
{ #jgqkMOd,j
if(pMsg -> wParam == VK_ESCAPE) OgTSx
return TRUE; B{=009.
if(pMsg -> wParam == VK_RETURN) 2mLUdx~c
return TRUE; sr4jQo
} q'2`0MRa
return CDialog::PreTranslateMessage(pMsg); @5GBuu^j
} cLHF9B5
edTMl;4
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) 9c6 '
{ W{\EE[XhCf
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ =1Ri]b
SaveBmp(); ,P!D-MN$V
return FALSE; BP:(IP!&
} CX.SYr&!R
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ SLg+H
CMenu pop; Q-jf8A]
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); hLSTSD}
CMenu*pMenu=pop.GetSubMenu(0); (`F|nG=X
pMenu->SetDefaultItem(ID_EXITICON); jF4csO=E
CPoint pt; (>mi!:
GetCursorPos(&pt); ?^Pq/VtZ
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); '6+Edu~Ho)
if(id==ID_EXITICON) j;G[%gi6{
DeleteIcon(); L2d:.&5
else if(id==ID_EXIT) @$EjD3Z-
OnCancel(); 99a\MH`^
return FALSE; DQMPAj.
} *3P3M}3~\
LRESULT res= CDialog::WindowProc(message, wParam, lParam); HIsB|
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) @kz!{g]Sn
AddIcon(); \w3%[+c
return res; =hPG_4#
} 5^b i
7J
b h*^{
void CCaptureDlg::AddIcon() `,Xb8^M2
{ xl3zy~;M
NOTIFYICONDATA data; D {Oq\*
data.cbSize=sizeof(NOTIFYICONDATA); V0s,f.a
CString tip; 8s~\iuk
tip.LoadString(IDS_ICONTIP); Q%I#{+OT
data.hIcon=GetIcon(0); hR!}u}ECd
data.hWnd=GetSafeHwnd(); \hrrPPD1z
strcpy(data.szTip,tip); g;l'VA3v
data.uCallbackMessage=IDM_SHELL; "bPCOJ[v9
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; XzW7eO,A
data.uID=98; .uBO
Shell_NotifyIcon(NIM_ADD,&data); ,%[LwmET
ShowWindow(SW_HIDE); Oy:QkV9
bTray=TRUE; TR~|c|B
} u0s'6=
m$,cH>E
void CCaptureDlg::DeleteIcon() WN$R[N
{ RZW$!tyI=
NOTIFYICONDATA data; %3rTQ:X
data.cbSize=sizeof(NOTIFYICONDATA); r)OO&. P@j
data.hWnd=GetSafeHwnd(); '7t|I6$ow
data.uID=98; F OeVRq:#
Shell_NotifyIcon(NIM_DELETE,&data); "Wo.8
ShowWindow(SW_SHOW); oHOW5
SetForegroundWindow(); Q!YF!WoBX
ShowWindow(SW_SHOWNORMAL); IF5sqv
bTray=FALSE; T<f2\q8Uo=
} Q,D0kS P
<{E;s)hD?
void CCaptureDlg::OnChange() J6eJIKK
{ w2 /* `YO
RegisterHotkey(); RzpC1nd
} Mm "Wk
|3 ;u"&(P
BOOL CCaptureDlg::RegisterHotkey() ]/LWrQD
{ \{[D|_
UpdateData(); bo&\3
UCHAR mask=0; {,i=>%X*
UCHAR key=0; `b#/[3
if(m_bControl) C/CN
'
mask|=4; kxygf9I!;
if(m_bAlt) qx Wgt(Os
mask|=2; IY V-*/
|
if(m_bShift) 3\7'm]
mask|=1; >vHH
key=Key_Table[m_Key.GetCurSel()]; qe[
if(bRegistered){ VPWxHVf
DeleteHotkey(GetSafeHwnd(),cKey,cMask); aF,jJ}On
bRegistered=FALSE; 4g>1Gqv6
} jo<>Hc{g>
cMask=mask; `E{;85bDH
cKey=key; anK[P'Y
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); (~=Qufy
return bRegistered; SrdE>fNbs
} qo61O\qm
T}V7SD.
四、小结 =
vY]G5y
&1*4%N@'
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。