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:
OA[fQH#{lX
i=V2
/W} 一、实现方法
X 0LC:0+ X*&Thmee 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:
Xpfw2;`U' 0J;Qpi!u2v #pragma data_seg("shareddata")
Rq|]KAN HHOOK hHook =NULL; //钩子句柄
0XA0b1V X UINT nHookCount =0; //挂接的程序数目
d8p5a
C+E static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
I(Vg static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
&@D\4b,?nm static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
'7.4!I0' static int KeyCount =0;
gq}c static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
.P ??N #pragma data_seg()
JX#0<U|L ]q&NO(:kbq 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。
NGW:hgf XS.*CB_m_ 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:
4"\%/kG rshUF BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
8wn{W_5a cKey,UCHAR cMask)
;f}
']2 {
B_XX)y %V BOOL bAdded=FALSE;
eAG)+b for(int index=0;index<MAX_KEY;index++){
as[! 9tB] if(hCallWnd[index]==0){
'@HCwEuz hCallWnd[index]=hWnd;
v3<q_J'qT HotKey[index]=cKey;
e-b> HotKeyMask[index]=cMask;
4^:$|\?] bAdded=TRUE;
0!tuUn KeyCount++;
QH?sx k2 break;
K\.tR }
M;YJpi }
WADEDl&,' return bAdded;
S27s Rxfr }
u^W!$OfZpp //删除热键
M0`1o p1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
#L57d {
F@zTz54t BOOL bRemoved=FALSE;
lr@w1* for(int index=0;index<MAX_KEY;index++){
VmRfnH" if(hCallWnd[index]==hWnd){
]bYmM@
if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
4&v&XLkb hCallWnd[index]=NULL;
gAf4wq HotKey[index]=0;
'%o^#gJ p HotKeyMask[index]=0;
,Z}ST|$u bRemoved=TRUE;
/ vu]ch KeyCount--;
zL'S5'<F| break;
Bx6,U4o* }
@.`k2lxGd~ }
u!
dx+v d }
|nGv:= H@ return bRemoved;
hTmJ
~m'J }
?Mn~XN4F_ J6"GHbsO {JF"PAS7 DLL中的钩子函数如下:
$\bVu2&I B+Ft
> LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
@AK&R~< {
0)ZLdF_6 BOOL bProcessed=FALSE;
YHMJ5IM@. if(HC_ACTION==nCode)
{7;QZk( {
?e,:x ]\L if((lParam&0xc0000000)==0xc0000000){// 有键松开
T8Q_JQ switch(wParam)
IM5[O}aq {
8=zREt<Se case VK_MENU:
AlkHf]oB MaskBits&=~ALTBIT;
L4bYVTm| break;
C
,|9VH case VK_CONTROL:
t)rPXvx}! MaskBits&=~CTRLBIT;
7S=,# break;
5% }!z~8Y4 case VK_SHIFT:
DsbTx.vA MaskBits&=~SHIFTBIT;
PN:`SWP break;
,KU%"{6 default: //judge the key and send message
(hg6<` break;
"S*@._ }
oN%zpz;OR for(int index=0;index<MAX_KEY;index++){
axq~56"7E if(hCallWnd[index]==NULL)
\u))1zRd continue;
S\Le;,5Z if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
nwC*w`4 {
#f/4%|t: SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
,np|KoG|M bProcessed=TRUE;
(:?bQA'Td }
+{C)^!zBK }
lyyf&?2 }
'> n&3`r5 else if((lParam&0xc000ffff)==1){ //有键按下
$R+gA{49% switch(wParam)
z%iPk'^ {
{2q0Ko< case VK_MENU:
NffKK:HvBB MaskBits|=ALTBIT;
1i_%1Oip break;
tE <?L case VK_CONTROL:
d|9]E&;, MaskBits|=CTRLBIT;
c h((u(G break;
AO|1m$xf case VK_SHIFT:
7YK6e MaskBits|=SHIFTBIT;
|5X59!
JL break;
11kyrv default: //judge the key and send message
I,HtW ), break;
" a,4E{7 }
+v:]#1 for(int index=0;index<MAX_KEY;index++){
mH4u@aQ} if(hCallWnd[index]==NULL)
svb7-.! continue;
z!18Jh if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~(huUW {
uOy/c 8` SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
,S(s bProcessed=TRUE;
f?ibyoXL }
4VwMl)8ic }
.Dl ?a>I }
.:B>xg~2 if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
/!A"[Tyt for(int index=0;index<MAX_KEY;index++){
~K99DK. if(hCallWnd[index]==NULL)
yFQaNuZPC continue;
m%>}T75C^ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
O8_!!Qd SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
l^B4.1rT //lParam的意义可看MSDN中WM_KEYDOWN部分
%7w8M{I R3 }
*" C9F/R }
!MOsP<2 }
96QY0
return CallNextHookEx( hHook, nCode, wParam, lParam );
8"g+
k`PRy }
QjG/H0*mP KG9-ac 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:
V45adDiZ B8n[ E BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
A#19&} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
~gGkw# 5|N`:h'9M 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:
<eS/-W%n6 T]tu#h{
a LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
d|7LCW+HW {
D15-pz|Q if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
G/~gF7 {
T4"D&~3
3q //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
jgG9?w)|u SaveBmp();
GiEt;8 return FALSE;
vt* }
~u2f`67{ …… //其它处理及默认处理
SJMbYjn0J }
a%si:_ B@i%B+qCLv 7Re\*[)T 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
j|K;Yi 3o?eUwI} 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。
2ww
H3} Fb8d=Zc 二、编程步骤
9X;*GC;d ) 5$?e 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
&Mudu/KTr x 4L3Z__ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
*.k*JsU~B EA8plQ~GtE 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
V@-Q&K# {cIk-nG-_ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
2gZp
O9 (PGw{_ 5、 添加代码,编译运行程序。
#G F.M,O/h y2s(]#8 三、程序代码
~h
Dp-R; x< 2]UB` ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Q*PcO \Y!y #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
QkD
~ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
tUc<ExvP, #if _MSC_VER > 1000
jI*@&3 #pragma once
,@?9H ~\ #endif // _MSC_VER > 1000
)?(Ux1:w) #ifndef __AFXWIN_H__
83/m^^F{] #error include 'stdafx.h' before including this file for PCH
`NgQ>KV! #endif
E7? n'!= #include "resource.h" // main symbols
B;e<.M)e class CHookApp : public CWinApp
KRT&]2 {
IjRUr \ l public:
rM
A%By^L- CHookApp();
Y3&,U // Overrides
M57<e`m // ClassWizard generated virtual function overrides
4aBVO%t //{{AFX_VIRTUAL(CHookApp)
Ti_G public:
L@6]~[JvP virtual BOOL InitInstance();
:dULsl$Nz virtual int ExitInstance();
3I~.'>Pd //}}AFX_VIRTUAL
ov,s]g83 //{{AFX_MSG(CHookApp)
Jk&!(YK& // NOTE - the ClassWizard will add and remove member functions here.
$o5i15Oy. // DO NOT EDIT what you see in these blocks of generated code !
YF-E1`+?< //}}AFX_MSG
,iP
YsW]5 DECLARE_MESSAGE_MAP()
3Q=\W<Wu };
HB5-B XBU LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
C{uT1` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
5=
&2= BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-#T%* BOOL InitHotkey();
Qr~!YPK\ BOOL UnInit();
g*YA~J@ #endif
+<F3}]] Wd)\r.pJ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
SF-"3M #include "stdafx.h"
1Xm>nF~ #include "hook.h"
Q}lCQK/g #include <windowsx.h>
{._'Q[ #ifdef _DEBUG
?i#x13 #define new DEBUG_NEW
fv8x7l7 #undef THIS_FILE
$G"\@YC< static char THIS_FILE[] = __FILE__;
wW\@^5 #endif
L f"!:] #define MAX_KEY 100
1aRTvaGo #define CTRLBIT 0x04
zE$HHY2ovi #define ALTBIT 0x02
AJ*17w #define SHIFTBIT 0x01
fTy:Re #pragma data_seg("shareddata")
zqNzWX HHOOK hHook =NULL;
`+\$ UINT nHookCount =0;
Z@Q*An static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
1[Yl8W%pj static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
*m<[ sS static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
W)Y`8&, static int KeyCount =0;
PL$XXj>|: static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
/K&9c
!]$C #pragma data_seg()
[=jZP,b&), HINSTANCE hins;
Ii[U% void VerifyWindow();
l%GArH` BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
0/f|ZH ~! //{{AFX_MSG_MAP(CHookApp)
]i`Q+q[ // NOTE - the ClassWizard will add and remove mapping macros here.
|U{~t<BF# // DO NOT EDIT what you see in these blocks of generated code!
^il$t]X5- //}}AFX_MSG_MAP
q5e(~@(z<` END_MESSAGE_MAP()
.p e3L7g %pjeA[-m# CHookApp::CHookApp()
d6tLCQ {
xk>cdgt // TODO: add construction code here,
`Ze$Bd\ // Place all significant initialization in InitInstance
}a5TY("d9H }
_%2ukuJ ` \HzmhQb+m CHookApp theApp;
IW<rmP=R& LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
q`2dL)E {
k0V]<#h87 BOOL bProcessed=FALSE;
61kSCu if(HC_ACTION==nCode)
b;
C}=gg {
dE,E,tv if((lParam&0xc0000000)==0xc0000000){// Key up
SQK82/ switch(wParam)
T>nH= {
7_s+7x = case VK_MENU:
?o+%ckH MaskBits&=~ALTBIT;
G^dp9A break;
QEt"T7a[/ case VK_CONTROL:
>Df;1:U MaskBits&=~CTRLBIT;
Ss5@ n break;
Q<V1`e case VK_SHIFT:
u,8)M'UU MaskBits&=~SHIFTBIT;
'12*'Q+{+ break;
+5|k#'%5 default: //judge the key and send message
tb~E.Lm\ break;
+?"F=.SZ }
I[K4/91 for(int index=0;index<MAX_KEY;index++){
au50%sA~
if(hCallWnd[index]==NULL)
bskoi;)u continue;
@,sjM] if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
M("sekL {
)m
=xf1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
xOShO"4Z bProcessed=TRUE;
MFa/%O_* }
N(4y}-w$ }
rMIX{K)'f }
sHBTB6)lx else if((lParam&0xc000ffff)==1){ //Key down
c8mh#Tbl switch(wParam)
T:{&eWH {
L)U*dY case VK_MENU:
*l
=f= MaskBits|=ALTBIT;
Lwi"K8.u break;
[Y*>x2X case VK_CONTROL:
Ve"(}z MaskBits|=CTRLBIT;
g4,ldr"D break;
UJqh~s case VK_SHIFT:
kI(3Pf]. MaskBits|=SHIFTBIT;
[5IbR9_ break;
8~Zw" default: //judge the key and send message
$k&v
juB. break;
qZ[HILh! }
%Jh(5 for(int index=0;index<MAX_KEY;index++)
00i MU {
pEcYfj3M if(hCallWnd[index]==NULL)
] \|2= continue;
!YGHJwW: if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
!Q~>)$Cf^ {
,|yscp8 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
z0+JMZ/ bProcessed=TRUE;
.+XK>jl+ }
8k:^( kByF }
R3og]=uFzm }
UVlB= if(!bProcessed){
:t`W&z41 for(int index=0;index<MAX_KEY;index++){
+j F|8 if(hCallWnd[index]==NULL)
dO2?&f continue;
5L2j,] if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
C@ q#s SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
EmO[-W|2 }
fh)eL<I }
pm=O.)g4` }
@a]cI return CallNextHookEx( hHook, nCode, wParam, lParam );
!4+Die X }
c.LRS$o/j q
j21#q
. BOOL InitHotkey()
V#$QKn`; {
,m`&J? if(hHook!=NULL){
-E6av|c,F nHookCount++;
4rL`|| return TRUE;
Eu&$Rq} }
V*s\ ~h) else
\9p.I?= hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
U}X'RCM if(hHook!=NULL)
[Uq`B&F: nHookCount++;
4$vUD1(' return (hHook!=NULL);
qh6b;ae\x }
^kcuRJ0*$ BOOL UnInit()
z6M5'$\y {
N
e{=KdzT if(nHookCount>1){
~b#<HG\,, nHookCount--;
~.^:?yCA return TRUE;
.4E24FB[f? }
Xp<O BOOL unhooked = UnhookWindowsHookEx(hHook);
]7k:3"wH if(unhooked==TRUE){
AaB1H7r- nHookCount=0;
|*J;X<Vm hHook=NULL;
1yF9zKs&_ }
[-l>fP0 return unhooked;
<?KgzIq2 }
CZ]Dm4 ']2d^'TH BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
"wV {
9=iMP~?xF BOOL bAdded=FALSE;
11QZ- ^ for(int index=0;index<MAX_KEY;index++){
c %Y*XJ' if(hCallWnd[index]==0){
: I";&7C hCallWnd[index]=hWnd;
lrHN6:x(Y4 HotKey[index]=cKey;
]5
]wyDj HotKeyMask[index]=cMask;
e^\(bp+83
bAdded=TRUE;
4IW90"uc KeyCount++;
J_&cI%. break;
DC>?e[oOz }
I&15[:b=- }
/KnIU|; return bAdded;
xG
edY*[` }
w_`;Mn%p fuHNsrNlm BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
34)l3UI~ {
#gWok'ZcR BOOL bRemoved=FALSE;
;6 d-+(@ for(int index=0;index<MAX_KEY;index++){
x%$6l if(hCallWnd[index]==hWnd){
9fbo if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
RjP]8tH& hCallWnd[index]=NULL;
7?k3jDK
HotKey[index]=0;
~yXDN4s HotKeyMask[index]=0;
LQ Ux} bRemoved=TRUE;
|uFb(kL[U KeyCount--;
?T%"Jgy8 break;
U%1M?vT/ }
T<nK/lp1t }
ueW/i }
mg70%=qM0f return bRemoved;
rFC9y o }
h8M}} {Gfsiz6 void VerifyWindow()
X eis_ {
9(=+OQ6 for(int i=0;i<MAX_KEY;i++){
j1Sjw6}GCH if(hCallWnd
!=NULL){ B[w.8e5
if(!IsWindow(hCallWnd)){ Ls|)SiXrY
hCallWnd=NULL; <uoVGV5N
HotKey=0; DD7D&@As
HotKeyMask=0; eUa:@cA
KeyCount--; 8EiS\$O-
} &BKnJ{,H
} Gyi0SM6v5&
} 60|m3|0o
} 7PfNPz<4+
Q-s5-&h(
BOOL CHookApp::InitInstance() 9XS>;<"2
{ HCktgL:E=
AFX_MANAGE_STATE(AfxGetStaticModuleState()); !L|VmLqa
hins=AfxGetInstanceHandle(); I)3LJK
InitHotkey(); %ID48_>*
return CWinApp::InitInstance(); 7S=]@*
} u[wDOw
Y>nQ<
int CHookApp::ExitInstance() =y?Aeqq\fl
{ @1k-h;`,
VerifyWindow(); <[gN4x>'
UnInit(); Y?oeP^V'u
return CWinApp::ExitInstance(); c2gZ<[~
} 5P);t9O6
ij_5=4aZ-
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file p4uObK,
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) [e|9%[.V
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ *gwo.s
#if _MSC_VER > 1000 ?v+el,
#pragma once ^#h ;bX#
#endif // _MSC_VER > 1000 (LVzE_`
X*)DpbWd
class CCaptureDlg : public CDialog FV OPC:}bj
{ !a%_A^t7
// Construction ~WmA55
public: C1YH\X(r
BOOL bTray; j->5%y
BOOL bRegistered; 8RZqoQDH
BOOL RegisterHotkey(); +9;6]4
UCHAR cKey; /I`-
UCHAR cMask; eY:jVYG(
void DeleteIcon(); ` apCu
void AddIcon(); &6\E'bBt
UINT nCount; (f"LD8MJ/
void SaveBmp(); \%W"KLP
CCaptureDlg(CWnd* pParent = NULL); // standard constructor *'@T+$3s
// Dialog Data JAmpU^(C
//{{AFX_DATA(CCaptureDlg) tg2+Z\0)4g
enum { IDD = IDD_CAPTURE_DIALOG }; i Hcy,PBD
CComboBox m_Key; QcdAg%"yy
BOOL m_bControl; Jd|E
4h~(
BOOL m_bAlt; Wjd_|Kui
BOOL m_bShift; @# p{,L
CString m_Path; ~f8:sDJ
CString m_Number; 2) Q/cH\g
//}}AFX_DATA ;T!ZO@1X
// ClassWizard generated virtual function overrides YO.+06X
//{{AFX_VIRTUAL(CCaptureDlg) `4|:8@,3{
public: I^``x+a
virtual BOOL PreTranslateMessage(MSG* pMsg); a0wpsl
iF
protected: 7x$VH5jie#
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support vri<R8
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); \-Q6z8
//}}AFX_VIRTUAL O
0P4uq
// Implementation 5W_Rg:J{P
protected: Ch&2{ng
HICON m_hIcon; A9y3B^\*
// Generated message map functions Xf|I=XK
//{{AFX_MSG(CCaptureDlg) K3J,f2Cn$
virtual BOOL OnInitDialog(); =|3*Y0
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); to] ~$~Q|>
afx_msg void OnPaint(); /o nZ14
afx_msg HCURSOR OnQueryDragIcon(); Up1e4mNL
virtual void OnCancel(); `+T"^{
Z
afx_msg void OnAbout(); |#O>DdKHT
afx_msg void OnBrowse(); 'iEu1! t\0
afx_msg void OnChange(); \hqjk:o
//}}AFX_MSG AKUmh
DECLARE_MESSAGE_MAP() /V E|F Ts
}; [Pz['q L3t
#endif ;v%f +
yH',vC.
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file jtQ}
#include "stdafx.h" 7^]KQ2fF
8
#include "Capture.h" :sJQ r._L
#include "CaptureDlg.h" bG!/%,s
#include <windowsx.h> .]K{8[:hq
#pragma comment(lib,"hook.lib") %1kIaYZ
#ifdef _DEBUG L<ET"&b;4
#define new DEBUG_NEW _ v3VUm#
#undef THIS_FILE uwWKsZ4:ij
static char THIS_FILE[] = __FILE__; ->a|
#endif 8QFg6#"O
#define IDM_SHELL WM_USER+1 EVDcj,b"^
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Fz@9
@
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); }<=_&n
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; D Ax1
class CAboutDlg : public CDialog k[5:]5lp+
{ Isg\ fSK<j
public: Zd8`95
CAboutDlg(); %<^j=K= 0
// Dialog Data )i$KrN6
//{{AFX_DATA(CAboutDlg) d2X?^
enum { IDD = IDD_ABOUTBOX }; T8>aU
//}}AFX_DATA 3?bTs =
// ClassWizard generated virtual function overrides *w[0uQL5Z
//{{AFX_VIRTUAL(CAboutDlg) Z6IWQo,)Rh
protected: ?dAy_|
zD
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -$cO0RSY
//}}AFX_VIRTUAL @ 3,:G$,
// Implementation Nh"U~zlh
protected: OzUo}QN
//{{AFX_MSG(CAboutDlg) i@#=Rxp
//}}AFX_MSG QEc4l[^{.B
DECLARE_MESSAGE_MAP() ;]^% 6B n
}; ;_p!20.(
80 ckh
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 8Cw3b\ne
{ #i=k-FA)H
//{{AFX_DATA_INIT(CAboutDlg) p'\zL:3
//}}AFX_DATA_INIT kxt/I<cs
} #N;McF;W
)F,z pGG
void CAboutDlg::DoDataExchange(CDataExchange* pDX) b!`{fwV
{ =TJ9Gr/R&:
CDialog::DoDataExchange(pDX); #O^%u,mJj
//{{AFX_DATA_MAP(CAboutDlg) Y]bS=*q
//}}AFX_DATA_MAP h}4yz96WD
} %F13*hOu
]Wtg.y6;
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) $+$4W\-=X
//{{AFX_MSG_MAP(CAboutDlg) ;2[),k
// No message handlers 2=uwGIF
//}}AFX_MSG_MAP HYl~)O>
END_MESSAGE_MAP() l"/E,X
06]"{2
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) 7QRkXs
: CDialog(CCaptureDlg::IDD, pParent) ox5WboL
{ gFl@A}
//{{AFX_DATA_INIT(CCaptureDlg) f4$sH/ 2#v
m_bControl = FALSE; nWA>u J5
m_bAlt = FALSE; p}8?#5`/w
m_bShift = FALSE; 2"_5Yyb
m_Path = _T("c:\\"); D>0(*O
m_Number = _T("0 picture captured."); 8*Ty`G&v
nCount=0; Po*!eD
bRegistered=FALSE; 5=
T$h;O
bTray=FALSE; #4<=Ira5
//}}AFX_DATA_INIT $gZiW 8
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \i+Ad@)
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); 2_}oOt?qiM
} H!'4A&
]-_ ma
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) LW k/h1
{ gegM&Xo
CDialog::DoDataExchange(pDX); bOSqD[?
//{{AFX_DATA_MAP(CCaptureDlg) t~<HFY*w
DDX_Control(pDX, IDC_KEY, m_Key); sf/m@425
DDX_Check(pDX, IDC_CONTROL, m_bControl); q;*'V9#
DDX_Check(pDX, IDC_ALT, m_bAlt); &hrMpD6z6i
DDX_Check(pDX, IDC_SHIFT, m_bShift); +s^nT{B@\
DDX_Text(pDX, IDC_PATH, m_Path); ;e.8EL
DDX_Text(pDX, IDC_NUMBER, m_Number); `vz7}TY
//}}AFX_DATA_MAP R+z'6&/ =I
} uQ|LkL%<^
Ve${g`7&
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) Kwi+}B!
//{{AFX_MSG_MAP(CCaptureDlg) '#SZ|Rr6tX
ON_WM_SYSCOMMAND() maeQ'Sv_&
ON_WM_PAINT() (H"{r
ON_WM_QUERYDRAGICON() |P`b"x
ON_BN_CLICKED(ID_ABOUT, OnAbout) :W6'G@ p
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ay|jq"a
ON_BN_CLICKED(ID_CHANGE, OnChange) ~`="tzr:
//}}AFX_MSG_MAP H4sW%nZ0
END_MESSAGE_MAP() bDudETl
x)Zb:"
BOOL CCaptureDlg::OnInitDialog() 9HEqB0|ZRu
{ Ijap%l1I
CDialog::OnInitDialog(); k`&FyN^)
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); *rbgDaQ
ASSERT(IDM_ABOUTBOX < 0xF000); d3
i(UN]
CMenu* pSysMenu = GetSystemMenu(FALSE); @$!6u0x
if (pSysMenu != NULL) FPkk\[EU
{ g],]l'7H
CString strAboutMenu; (F 9P1Iq
strAboutMenu.LoadString(IDS_ABOUTBOX); B9[vv;lzu
if (!strAboutMenu.IsEmpty()) ](v,2(}=
{ Nsq=1)
<
pSysMenu->AppendMenu(MF_SEPARATOR); _'17C/
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); [[]yQ
"
} 2wnk~URj
} ']fyD3N
SetIcon(m_hIcon, TRUE); // Set big icon i7PS=]TK\
SetIcon(m_hIcon, FALSE); // Set small icon )/JVp>
m_Key.SetCurSel(0); maHz3:
RegisterHotkey(); (T$cw(!
CMenu* pMenu=GetSystemMenu(FALSE); Y:\]d1C
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); YgjW%q
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); QIU%!9Y
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); 5Za<]qxr
return TRUE; // return TRUE unless you set the focus to a control \)wVO*9*0
} jtpHDS
)m3emMO2
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) A^6z.MdYZ
{ $*$4DG1gaR
if ((nID & 0xFFF0) == IDM_ABOUTBOX) xzA!,75@U
{ UJDI[`2
CAboutDlg dlgAbout; xi.?@Lff
dlgAbout.DoModal(); lH`c&LL-=!
} :|S[i('
else ewN|">WXQ
{ EXjR&"R
CDialog::OnSysCommand(nID, lParam); ujE~#b}X
} 04=RoYMM
} ib
'l:GM
4clCZ@\K^
void CCaptureDlg::OnPaint() m(:R (K(je
{ ]AM*9!
if (IsIconic()) 0vDvp`ie#4
{ !BrZTo
CPaintDC dc(this); // device context for painting SeS ZMv
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); g'T L`=O
// Center icon in client rectangle uEr.LCAS
int cxIcon = GetSystemMetrics(SM_CXICON); h(}#s1Fzq
int cyIcon = GetSystemMetrics(SM_CYICON); .,(x7?
CRect rect; c[X6!_
GetClientRect(&rect); _X<V`,
p
int x = (rect.Width() - cxIcon + 1) / 2; RT'5i$q[
int y = (rect.Height() - cyIcon + 1) / 2; Q2]7|C
// Draw the icon pX>wMc+
dc.DrawIcon(x, y, m_hIcon); ?wmu0rR
} cdH`#X
else v6aMYmenBH
{ oz:J.<j24Z
CDialog::OnPaint(); V_v+i c^
} )PU\|I0|)e
} GpO@1 C/
F{7
BY~d
HCURSOR CCaptureDlg::OnQueryDragIcon() GO][`zZJ]
{ F/A)2 H_
return (HCURSOR) m_hIcon; >[T6/#M
} z=jzr=lP
e2;=OoBK
void CCaptureDlg::OnCancel() [vY)y\W{
{
ji ,`?
if(bTray) (lit^v,9
DeleteIcon(); }!s$
/Kn
CDialog::OnCancel(); FEa%wS{
} <bv9X?U
X/Fip0i
void CCaptureDlg::OnAbout() <_bGV
{ o1]1I9
CAboutDlg dlg; ;Oqbfl#%
dlg.DoModal(); 6ESS>I"su
} SnO,-Rg
E/ku VZX
void CCaptureDlg::OnBrowse() aO\@5i_r
{ "rQ?2?
CString str; _&@cU<bdee
BROWSEINFO bi; FEA/}*2F
char name[MAX_PATH]; zfml^N
ZeroMemory(&bi,sizeof(BROWSEINFO)); ?nR$>a`
bi.hwndOwner=GetSafeHwnd(); \WVY@eB
bi.pszDisplayName=name; 9'p
pb
bi.lpszTitle="Select folder"; (G"/C7q
bi.ulFlags=BIF_RETURNONLYFSDIRS; R*O6Z"h
LPITEMIDLIST idl=SHBrowseForFolder(&bi); kRz qgVr%
if(idl==NULL) k1FG$1.
return; 4Gy3s|{
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); y=}a55:qE
str.ReleaseBuffer(); KR4 RIJZ_t
m_Path=str; 1g|6,J
if(str.GetAt(str.GetLength()-1)!='\\') a4!6K
m_Path+="\\"; L w/ZKXDU2
UpdateData(FALSE); 8ax3"G
} !P _'n
!un_JZD
void CCaptureDlg::SaveBmp() EmcwX4|
{ j7Lw(AJ
CDC dc; !r0 z3^*N
dc.CreateDC("DISPLAY",NULL,NULL,NULL); K~z9b4a>
CBitmap bm; fbW#6:Y
int Width=GetSystemMetrics(SM_CXSCREEN); &T-udgR9
int Height=GetSystemMetrics(SM_CYSCREEN); %G~%:uJ5
bm.CreateCompatibleBitmap(&dc,Width,Height); y
`w5u.'
CDC tdc; nr{}yQu
tdc.CreateCompatibleDC(&dc); JE+{Vx}
CBitmap*pOld=tdc.SelectObject(&bm); q|ZQsFZ
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); <0)@Ikhx
tdc.SelectObject(pOld); W?auY_+P
BITMAP btm; X?.LA7 )CK
bm.GetBitmap(&btm); I#hzU8Cc
DWORD size=btm.bmWidthBytes*btm.bmHeight; !.k
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); }+f@$L
BITMAPINFOHEADER bih; =u`^QE
bih.biBitCount=btm.bmBitsPixel; 7J2i /m
bih.biClrImportant=0; )Ikx0vDFQ
bih.biClrUsed=0; M3dNG]3E
bih.biCompression=0; v0} .!u>Ww
bih.biHeight=btm.bmHeight; O ijG@bI8
bih.biPlanes=1; /CN^">|_
bih.biSize=sizeof(BITMAPINFOHEADER); SQbnn"
bih.biSizeImage=size; XA:v:JFS
bih.biWidth=btm.bmWidth; "I]% aK0
bih.biXPelsPerMeter=0; Mzx y'UV
bih.biYPelsPerMeter=0; hU `H\LE
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 1]v.Qu<
static int filecount=0; u]ZCYJ>
CString name; ~Hs a6F&F
name.Format("pict%04d.bmp",filecount++); @Tr8.4
name=m_Path+name; `r iK[@
BITMAPFILEHEADER bfh; /5_!Y>W
bfh.bfReserved1=bfh.bfReserved2=0; (byFr9z
bfh.bfType=((WORD)('M'<< 8)|'B'); @hWt.qO3s
bfh.bfSize=54+size; #f@sq5pTO
bfh.bfOffBits=54; eW+z@\d9Gz
CFile bf; "Gxf[6B
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ X(#G6KeZFZ
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); Qp${/
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); #x&1kHu<
bf.WriteHuge(lpData,size); =2{ ^qvP
bf.Close(); fN>o465I6
nCount++; *Oo2rk nQ
} -$4PY,
GlobalFreePtr(lpData); qgU$0enSs
if(nCount==1) uV *&a~
m_Number.Format("%d picture captured.",nCount); V5RfxWtm:
else dM 7-,9Vc
m_Number.Format("%d pictures captured.",nCount); KaHjL&!
UpdateData(FALSE); F\&R nDJ
} [:sV;37s
}S$]MY,*
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) QE$sXP7&u
{ Yt7R[|
if(pMsg -> message == WM_KEYDOWN) xO6)lVd
{ +dk}$w[g
if(pMsg -> wParam == VK_ESCAPE) ]Z@-r
return TRUE;
F\Ex$:%~
if(pMsg -> wParam == VK_RETURN) e&E""ye
return TRUE; uG2Hzav
} /N7j5v(
return CDialog::PreTranslateMessage(pMsg); Y|g8xkI}XB
} p0UR5A>p
4E}/{1
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) ">*PH}b
{ iXMs*GcK
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ ;zIAh[z
SaveBmp(); o4,W!^n2
return FALSE; KZ
pqbI Z
} V,fSn:8%M
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ <|~X,g;f
CMenu pop; ksT2_Ic
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); lh&Q{t(+8
CMenu*pMenu=pop.GetSubMenu(0); I8)x0)Lx
pMenu->SetDefaultItem(ID_EXITICON); U|={LU
CPoint pt; t0d1??G
GetCursorPos(&pt); KQj5o>} 6
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); tpO%)*
if(id==ID_EXITICON) \IbGNV`q
DeleteIcon(); L\XnTL{
else if(id==ID_EXIT) p@y?xZS
OnCancel(); c%yhODq/
return FALSE; PW x9CT
} [84ss;.$
LRESULT res= CDialog::WindowProc(message, wParam, lParam); iF?4G^
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) h.E8G^}@
AddIcon(); !v;N@C3C
return res; 9o"k
7$
} d:.S]OI0
Ly0^ L-~|
void CCaptureDlg::AddIcon() V)72]p
{ :[|4Zn
NOTIFYICONDATA data; }9<pLk
data.cbSize=sizeof(NOTIFYICONDATA); +]
>o@
CString tip; Eq=~S O%
tip.LoadString(IDS_ICONTIP); -/Pg[Lx7Pb
data.hIcon=GetIcon(0); $n\{6Rwb
data.hWnd=GetSafeHwnd(); ABw:SQ6=Q
strcpy(data.szTip,tip); W+d=BnOa8
data.uCallbackMessage=IDM_SHELL; ]KdSwIbi
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; S<H2e{~
data.uID=98; w{l}(:xPp
Shell_NotifyIcon(NIM_ADD,&data); N"1o>
!
ShowWindow(SW_HIDE); ^<49NUB>
bTray=TRUE; ,$s
NfW
} <fg~+{PA&
+e}v)N
void CCaptureDlg::DeleteIcon() Z:9xf:g*
{ oJb${k<3
NOTIFYICONDATA data; lKWe=xY\B
data.cbSize=sizeof(NOTIFYICONDATA); !_C*2+f
data.hWnd=GetSafeHwnd();
A[:0?Ez=
data.uID=98; Cp4 U`]
Shell_NotifyIcon(NIM_DELETE,&data); /k8Lu+OJ
ShowWindow(SW_SHOW); U{/d dCf7
SetForegroundWindow(); q{T[|(!
ShowWindow(SW_SHOWNORMAL); blO(Th&
bTray=FALSE; /9T.]H~
} ovm109fTx
SO @d\H
void CCaptureDlg::OnChange() ybNo`:8A;
{ 0z&]imU
RegisterHotkey(); )#S;H$@$
} vZMb/}-o
3L}eFg,d
BOOL CCaptureDlg::RegisterHotkey() \PReQ|[ah
{ Y;2WY0eq
UpdateData(); =rz7 x
UCHAR mask=0; 2%4u/
UCHAR key=0; kNq>{dNRx
if(m_bControl) JBqL0H
mask|=4; |i_+b@Lul
if(m_bAlt) _L?MYkD
mask|=2; kjAARW
if(m_bShift) 4JQd/;
mask|=1; eXKp um~
key=Key_Table[m_Key.GetCurSel()]; DO*rVs3'p[
if(bRegistered){ s&v7<)*q
DeleteHotkey(GetSafeHwnd(),cKey,cMask); 3.?G,%S5.$
bRegistered=FALSE; Td,2.YMQ
} atr0hmQ
cMask=mask; de7
\~$
cKey=key; ;wGoEN
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); U{1%ldOJ%
return bRegistered; +_E^E
} a]H&k$!c
N+lhztYQ?
四、小结 9w3KAca
we:P_\6
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。