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:
MhXm-<4
]0nC;|]@Lx 一、实现方法
5^R#e(mr +R jD\6bJb 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:
6O?S r, UEb'E; #pragma data_seg("shareddata")
L
~'N6 HHOOK hHook =NULL; //钩子句柄
j;c^pLUP UINT nHookCount =0; //挂接的程序数目
Q14;G<l- static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
I.0Usa"z static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
q>h+Ke static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
1+[|pXT} static int KeyCount =0;
3B]+]e~ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
BwA~*5TFu #pragma data_seg()
<i@jD LWR&(p.% 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。
-|UX}t* }E]&13>r 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:
2G*#Czr" `e:RZ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
*" +cP! cKey,UCHAR cMask)
rb4g<f| {
."g5+ xX BOOL bAdded=FALSE;
;-w PXXR for(int index=0;index<MAX_KEY;index++){
I>\?t4t if(hCallWnd[index]==0){
Tp.iRFFkP hCallWnd[index]=hWnd;
<Gt{(is HotKey[index]=cKey;
|L#r)$n{1 HotKeyMask[index]=cMask;
R-0Ohj bAdded=TRUE;
J;9QDrl` KeyCount++;
`9NnL.w! break;
I ywx1ac }
23?0'AU }
{dH<Un(4Z return bAdded;
Ya{1/AaM }
!q1^X% a //删除热键
YZ+g<HXB BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Fi}rv[`XY[ {
!!pi\J?sk BOOL bRemoved=FALSE;
nf^k3QS\ for(int index=0;index<MAX_KEY;index++){
+ {dIs if(hCallWnd[index]==hWnd){
DccsVR`7 if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
q.Mck9R7 hCallWnd[index]=NULL;
!S}Au Mw HotKey[index]=0;
VZ!$'?? HotKeyMask[index]=0;
u $^`hzfI bRemoved=TRUE;
jCa;g{#@ KeyCount--;
,3[<C)'[ break;
2fA9L _:0 }
y6yseR! }
$+N^ s^ }
Lu5.$b return bRemoved;
1F8EL)9 }
j ZafwBi 7l
EwQ 55en
D DLL中的钩子函数如下:
=&xoyF $S ("-3 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
=f|a?j,f~ {
n#,l&Bx BOOL bProcessed=FALSE;
CplRnKra if(HC_ACTION==nCode)
i`spM<iR. {
)o,0aGo>Of if((lParam&0xc0000000)==0xc0000000){// 有键松开
!Z)^c& switch(wParam)
1#uw^{n {
^!tI+F{n{ case VK_MENU:
xz'd5 re% MaskBits&=~ALTBIT;
<5^(l$IBj break;
!d)i6W? case VK_CONTROL:
?5gpk1 MaskBits&=~CTRLBIT;
EF~PM break;
pdu case VK_SHIFT:
{<n)zLy MaskBits&=~SHIFTBIT;
N/=3Bs0y- break;
1r4/McB default: //judge the key and send message
tYa*%|!v break;
jgIzB1H }
a06q-3zw for(int index=0;index<MAX_KEY;index++){
%tLq&tyeY if(hCallWnd[index]==NULL)
P
ie!Su` continue;
|0mI3r if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
_J!mhUA {
K@hUif|([ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
&9{BuBO[ bProcessed=TRUE;
oPBjsQ }
x=)$sD-3 }
'& :"/4@) }
gV;GC{pY else if((lParam&0xc000ffff)==1){ //有键按下
,oil}N( switch(wParam)
/L^dHI]Q {
2N]s}/l case VK_MENU:
8m0sEV> MaskBits|=ALTBIT;
xx8na8 break;
V|`|CVFo] case VK_CONTROL:
YJ$
=`lIM MaskBits|=CTRLBIT;
kRPg^Fw"Vw break;
0rUf'S
?K case VK_SHIFT:
@9a=D<'> MaskBits|=SHIFTBIT;
mws.) break;
A@r,A?( default: //judge the key and send message
$Plk4 o*g break;
!HYqM(|{. }
cGKk2'v? for(int index=0;index<MAX_KEY;index++){
4N&}hOM'S if(hCallWnd[index]==NULL)
2D"/k'iA continue;
q4oZJ -` if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
,,gYU_V {
e+TNG &_ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
5c8x:
e@ bProcessed=TRUE;
Q!v[b{]8 }
b.&YUg[# }
{'(8<n57 }
cO9Aw ! if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
2hP8ZfvIR for(int index=0;index<MAX_KEY;index++){
.VT,,0 if(hCallWnd[index]==NULL)
Is[0ri continue;
":ycyN@g if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
79_MP SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
{{\HU0g>& //lParam的意义可看MSDN中WM_KEYDOWN部分
Z%R^;8 !~ }
#4>F%_ }
XLT<,B}e }
yM@cml6Ox return CallNextHookEx( hHook, nCode, wParam, lParam );
mr? ii }
X*Zv,Wm K#@FKv|(" 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
4NIfQYC. DP_ \%(A BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
jYv
!} BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
4y]*"(sQ; tP-c>|cz 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
Pl4d(2
7 ;nE}%lT LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
|(5=4j] {
<*P1Sd. if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
O/Vue {
"/5b3^a //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
XJ9>a-{ SaveBmp();
2Z~ofrj return FALSE;
gN%R-e0 }
`Ec+i …… //其它处理及默认处理
WyP1"e^9 }
ZUycJ-[ #A!0KN;GC2 cf9y0 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
yyc&'J 3B+Rx;>h 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
O9Aooe4W= \=)h6AG 二、编程步骤
(!s[~O 6 jk@]d5 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
d<o P;34Rd 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
K4"as9oFP OuoZd!"qf 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
6c :$[owC ?9:\1)] 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;
?jbam!A W2RS G~| 5、 添加代码,编译运行程序。
kVY@q&p UWHC]V? 三、程序代码
Hg4Ut/0 @)B_e*6>' ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
"<n{/x( #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
DWAU8>c+ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
@,]v'l!u #if _MSC_VER > 1000
[>E0(S] #pragma once
`*]r.u0 #endif // _MSC_VER > 1000
_~!,x.Dbp #ifndef __AFXWIN_H__
7Do)++t #error include 'stdafx.h' before including this file for PCH
DWI!\lK #endif
lk80)sTZ #include "resource.h" // main symbols
L<:ya class CHookApp : public CWinApp
dx^3(#B {
yAOC<d9 E public:
[LCi, CHookApp();
m<E7cY3mX // Overrides
kHO\#fF< // ClassWizard generated virtual function overrides
IX}l)t[:( //{{AFX_VIRTUAL(CHookApp)
39"'Fz?1 public:
-?uwlpm# virtual BOOL InitInstance();
0*q:p`OLw* virtual int ExitInstance();
eMs`t)rQ //}}AFX_VIRTUAL
sb1/4u/W //{{AFX_MSG(CHookApp)
HwHI$IB // NOTE - the ClassWizard will add and remove member functions here.
vI-KH:r"{ // DO NOT EDIT what you see in these blocks of generated code !
MmX42;Pw //}}AFX_MSG
U+KbvkX wj DECLARE_MESSAGE_MAP()
MIgIt"M jz };
7Ny>W(8 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
m ]\L1& BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
6?6
u BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
z"<PveVo BOOL InitHotkey();
|^ qW
BOOL UnInit();
8]O|$8'" #endif
<^=k~7m 7cC$) //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
L@/+u+j0 #include "stdafx.h"
KksbhN{AB #include "hook.h"
Z5\6ca #include <windowsx.h>
<C&UDj #ifdef _DEBUG
nJ,56}
#define new DEBUG_NEW
f:TW< #undef THIS_FILE
v#~,)-D& static char THIS_FILE[] = __FILE__;
'
|4XyU= #endif
H Q2-20 #define MAX_KEY 100
VAq:q8(K #define CTRLBIT 0x04
RR"#z'zQ #define ALTBIT 0x02
M?,;TJ7Gd #define SHIFTBIT 0x01
;,viE~n #pragma data_seg("shareddata")
:A[ Gtc(_ HHOOK hHook =NULL;
(nBsf1l UINT nHookCount =0;
zmdOL9"a
static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
O&}0 7( static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
As"'KR static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
+/ #J]v- static int KeyCount =0;
cJt#8P
static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
n1H*][CK #pragma data_seg()
lB-Njr HINSTANCE hins;
})J]D~!p void VerifyWindow();
wtZe\h BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
9U+^8,5 //{{AFX_MSG_MAP(CHookApp)
U*-%V$3+w5 // NOTE - the ClassWizard will add and remove mapping macros here.
kr3ZqMfeI // DO NOT EDIT what you see in these blocks of generated code!
l!oU9 //}}AFX_MSG_MAP
u",
[ulP END_MESSAGE_MAP()
KmMt:^9 Va1|XQ<CL CHookApp::CHookApp()
I} j!
! {
S`NH6?/uH // TODO: add construction code here,
~sM334sQ // Place all significant initialization in InitInstance
zNBG;\W }
&B))3WFy UPbG_ #"wZ CHookApp theApp;
2+|[e_ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
oL<^m?-u {
&R 0BuFL8 BOOL bProcessed=FALSE;
QII>XJ9 if(HC_ACTION==nCode)
5bgx;z9 {
Lg'z%pi if((lParam&0xc0000000)==0xc0000000){// Key up
Q 5Ln'La$ switch(wParam)
d~.#K S {
A0'Yfuie case VK_MENU:
b+{yF MaskBits&=~ALTBIT;
u!t'J+: break;
5^%FEZ&Sp case VK_CONTROL:
^D!UF(H MaskBits&=~CTRLBIT;
r>
NgJf, break;
0n5N-b?G-@ case VK_SHIFT:
`AYHCn MaskBits&=~SHIFTBIT;
HIF.;ImG^ break;
{~Phc 2z default: //judge the key and send message
<}|+2f233+ break;
u\6:Txqq }
v=|ahsYC for(int index=0;index<MAX_KEY;index++){
r l!c\ if(hCallWnd[index]==NULL)
`DEz `
D continue;
3xeW!~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
zV%U4P)Dao {
_m;Y' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
M*%iMz bProcessed=TRUE;
nL\BB& }
[^aow-4z }
y%43w4 }
,;UVQwY else if((lParam&0xc000ffff)==1){ //Key down
Qp{{OjD switch(wParam)
'
R{ [Y) {
4SmhtC case VK_MENU:
C]{43 MaskBits|=ALTBIT;
1XwbsKQ} break;
,b2Cl[ case VK_CONTROL:
/I="+ MaskBits|=CTRLBIT;
M,NYF`;a break;
vX&Nh"0H& case VK_SHIFT:
EFV'hMjS) MaskBits|=SHIFTBIT;
i:@00)V{, break;
{]`O $S default: //judge the key and send message
K
o,O!T. break;
e3&R3{ }
{5:y,=Y for(int index=0;index<MAX_KEY;index++)
&d=j_9 {
YMC*<wXN if(hCallWnd[index]==NULL)
c}lUP(Ss continue;
F?TAyD* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
W,}C*8{+ {
wQDKv'zU1 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
1)H+iN|im/ bProcessed=TRUE;
mI@]{K}Q% }
L=
hPu#&/ }
@MTm8E6au }
ShFSBD\M# if(!bProcessed){
GJU84Xn7 for(int index=0;index<MAX_KEY;index++){
,LX] if(hCallWnd[index]==NULL)
=fEn h'KE continue;
RY/9Ku ` if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
[.dF)I3 SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
mm'Pe4* }
"4|D"|wI) }
o|$l+TC }
R Mrh@9g return CallNextHookEx( hHook, nCode, wParam, lParam );
Fd9ypZs }
d_]zX;_ RoT}L#!! BOOL InitHotkey()
N
=)9O {
89@gYA"Su if(hHook!=NULL){
Q"S;r1 D nHookCount++;
Az{Z=:(0 return TRUE;
l>Z"y\l= }
G)G5eXXX else
UOi8>;k` hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
LDx1@a|83 if(hHook!=NULL)
+.:- : nHookCount++;
&V:iy return (hHook!=NULL);
#zyEN+ }
)u`q41! BOOL UnInit()
L
slI!.( {
:[?hU}9 if(nHookCount>1){
?V3e;n nHookCount--;
QJjqtOf> return TRUE;
3a_~18W }
ZG"_M@S. BOOL unhooked = UnhookWindowsHookEx(hHook);
Z~CL|= if(unhooked==TRUE){
s,)Z8H nHookCount=0;
=a$7OV. hHook=NULL;
*shE-w;C }
Gk
g)\ 3 return unhooked;
N*gnwrP{ }
)OS^tG[= ~*@UQ9*p# BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>/9f>d?w^ {
$i;%n1VBg BOOL bAdded=FALSE;
1
\:5ow&a for(int index=0;index<MAX_KEY;index++){
V)mitRaV if(hCallWnd[index]==0){
Vf:/Kokq hCallWnd[index]=hWnd;
1Ue)&RW HotKey[index]=cKey;
:q/%uca9 HotKeyMask[index]=cMask;
+`>Tuz~ bAdded=TRUE;
\]1qAFB5 KeyCount++;
ZF!cXo7d break;
w9Bbvr6 }
SvLI%>B=9 }
>08'+\~:b return bAdded;
-<h4I
aM }
%F_)!M;x F<39eDNpz BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
50q(8F-N {
rozp BOOL bRemoved=FALSE;
m-Z<zEQ for(int index=0;index<MAX_KEY;index++){
4i|yEf if(hCallWnd[index]==hWnd){
LVP2jTz if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
38#BINhBt hCallWnd[index]=NULL;
GH[ATL HotKey[index]=0;
""q76cx HotKeyMask[index]=0;
589hfET bRemoved=TRUE;
Dukvi;\ KeyCount--;
jfF
break;
G<:_O-cPSv }
GCm(3%{V%( }
5+Fr/C }
H3CG'?{ _ return bRemoved;
yq]= +X>( }
WR,MqM20 Is57)(^.- void VerifyWindow()
W<|
M0S{ {
]wb^5H
for(int i=0;i<MAX_KEY;i++){
e!k1GTH^ if(hCallWnd
!=NULL){ Uq/FH@E=
if(!IsWindow(hCallWnd)){ 7vZtEwC)n
hCallWnd=NULL; ZEa31[@B[
HotKey=0; @
>_v/U'
HotKeyMask=0; p?rh+0wgX
KeyCount--; |iSd<
} Z$jqB~=^e
} In13crr4!
} x#
M MrV&M
} 2[}
O:
%n?_G|
BOOL CHookApp::InitInstance() ;&7dX^oH
{ I[nSf]Vm>
AFX_MANAGE_STATE(AfxGetStaticModuleState()); !y_4.&C{
hins=AfxGetInstanceHandle(); ,^wjtA3j8
InitHotkey(); Jj%"
return CWinApp::InitInstance(); m-?hHdO
} SzXR],dA
# `L?24%
int CHookApp::ExitInstance() `st3iTLZY
{ %[S-"k
VerifyWindow(); t?1b(oJ
UnInit(); u-</G-y
return CWinApp::ExitInstance(); wH]5VltUT1
} Z?JR6;@W
a=_+8RyVQ
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file %Yw?!GvL[
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) U/ds(*g@
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ gug9cmA/Q7
#if _MSC_VER > 1000 _ \&vA5-
#pragma once Mbm'cM&}
#endif // _MSC_VER > 1000 !#&`1cYX
t?Ku6Z'
class CCaptureDlg : public CDialog Dxvizd>VU
{ 1FA:"0lO
// Construction (}B3df
public: E)>.2{]C>
BOOL bTray; okm
}%#|
BOOL bRegistered; _p*a`,tK
BOOL RegisterHotkey(); Dc@OrQu
UCHAR cKey; LUaOp
"
UCHAR cMask; t]gZ^5
void DeleteIcon(); ?i{/iH~Sf
void AddIcon(); p C^=?!:U
UINT nCount; R1C}S
void SaveBmp(); (jmF7XfU
CCaptureDlg(CWnd* pParent = NULL); // standard constructor >;Ag7Ex
// Dialog Data \^o I3K0`
//{{AFX_DATA(CCaptureDlg) <#nt?Xn
enum { IDD = IDD_CAPTURE_DIALOG }; s,CN<`/>x
CComboBox m_Key; x`:c0y9uG
BOOL m_bControl; PQj 'D<G
BOOL m_bAlt; )&6ZgRq
BOOL m_bShift;
o'EJ,8
CString m_Path; *q&^tn b
CString m_Number; ;{lb_du2:
//}}AFX_DATA ~Z`Cu~7
// ClassWizard generated virtual function overrides '[Zgwz;z
//{{AFX_VIRTUAL(CCaptureDlg) z{H=;"+rh
public: $sxRRem{?
virtual BOOL PreTranslateMessage(MSG* pMsg); rSa=NpFxLu
protected: -xXdT$Xd
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support G)IK5zCDd
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); V1#:[o63+
//}}AFX_VIRTUAL N&yr?b'!-*
// Implementation $;pHv<
protected: z[Ah9tM%
HICON m_hIcon; 8-B6D~i
// Generated message map functions Y(RB@+67
//{{AFX_MSG(CCaptureDlg) &>f]
virtual BOOL OnInitDialog(); #HDP ha
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0^3n#7m;K
afx_msg void OnPaint(); RNo~}#
afx_msg HCURSOR OnQueryDragIcon(); 8,@0~2fz#
virtual void OnCancel(); +mPVI
afx_msg void OnAbout(); 5pU/X.lc
afx_msg void OnBrowse(); 6e>P!bo
afx_msg void OnChange(); @?JFqwq!
//}}AFX_MSG 6$)FQ
U
DECLARE_MESSAGE_MAP() 8'PK}heBU
}; 2#(dfEAy
#endif mCe"=[
w8D6j%C
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file
:al
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#include "stdafx.h" ,!H`@Kl
#include "Capture.h" Xhs*nt%l
#include "CaptureDlg.h" dsU'UG7L
#include <windowsx.h> o<gK"P
#pragma comment(lib,"hook.lib") Q{|_"sfJ
#ifdef _DEBUG `mthzc3W
#define new DEBUG_NEW wQ^RXbJI9
#undef THIS_FILE $[g#P^
static char THIS_FILE[] = __FILE__; Te%V+l
#endif k4PXH
#define IDM_SHELL WM_USER+1 a>Wr2gPko
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); *X5<]{7c
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); Kzx`
E>,z'
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; $0gGRCCG;
class CAboutDlg : public CDialog @_$Un&eo
{ .ah[!O
public: IISdC(5
CAboutDlg(); Q@1SqK#-DQ
// Dialog Data "l{{H&d
//{{AFX_DATA(CAboutDlg) E!RlH3})
enum { IDD = IDD_ABOUTBOX }; 99tUw'w
//}}AFX_DATA ix hF,F
// ClassWizard generated virtual function overrides =9h!K:,k
//{{AFX_VIRTUAL(CAboutDlg) 6 w'))Z
protected: klAvi%^jE
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 2bOl`{x
//}}AFX_VIRTUAL D*>#]0X
// Implementation QHxof7
protected: H$V`,=H
//{{AFX_MSG(CAboutDlg) dT0>\9ZNr
//}}AFX_MSG j#Qnu0D
DECLARE_MESSAGE_MAP() ^ (s(4|
}; erKi*GssZ
i&%m^p
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) lMl'+ yy
{ zGdYk-H3TH
//{{AFX_DATA_INIT(CAboutDlg) /'/i?9:
//}}AFX_DATA_INIT t3AmXx
} nu)YN1
*
"@^Q"RF
void CAboutDlg::DoDataExchange(CDataExchange* pDX) UfIr"bU6
{ -
~4na{6x
CDialog::DoDataExchange(pDX); =W&m{F96
//{{AFX_DATA_MAP(CAboutDlg) ~{$c|
//}}AFX_DATA_MAP z9!OzGtIR
} / ykc`E?f
-u7NBtgUh
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) qRR%aJ/
//{{AFX_MSG_MAP(CAboutDlg) ]j!pK4
// No message handlers mMvAA;
//}}AFX_MSG_MAP q65]bs4M
END_MESSAGE_MAP() ##%&*vh
-&Q+x,.%
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) artn _
: CDialog(CCaptureDlg::IDD, pParent) dz^b(q
{ P,xIDj4d
//{{AFX_DATA_INIT(CCaptureDlg) p6aR/gFkqv
m_bControl = FALSE; sH>`eqY
m_bAlt = FALSE; puLgc$?
m_bShift = FALSE; t3!OqM
m_Path = _T("c:\\"); ]Ok'C"V(j
m_Number = _T("0 picture captured."); (S4HU_,88
nCount=0; L[Ot$
bRegistered=FALSE; cU-A1W
bTray=FALSE; PD^G$LT
//}}AFX_DATA_INIT Y9gw
('\w
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 jABFdNjri
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); SME9hS$4
} AusjN-IL
N:CQ$7T{ j
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) *dxm|F98
{ %%/8B
CDialog::DoDataExchange(pDX); 1Q!kk5jE
//{{AFX_DATA_MAP(CCaptureDlg) rB{w4
DDX_Control(pDX, IDC_KEY, m_Key); &4+|{Zx0
DDX_Check(pDX, IDC_CONTROL, m_bControl); 0b/@QgJ
DDX_Check(pDX, IDC_ALT, m_bAlt); {bADMj1
DDX_Check(pDX, IDC_SHIFT, m_bShift); _n/73Oh
DDX_Text(pDX, IDC_PATH, m_Path); C\ joDAD
DDX_Text(pDX, IDC_NUMBER, m_Number); g?xD*3<
//}}AFX_DATA_MAP 4U_+NC>b
} 73]8NVm
F,A+O+
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) g$jT P#%b
//{{AFX_MSG_MAP(CCaptureDlg) )[J@s=
ON_WM_SYSCOMMAND() )iM(
\=1ff
ON_WM_PAINT() }6BXa
ON_WM_QUERYDRAGICON() IuT)?S7O*k
ON_BN_CLICKED(ID_ABOUT, OnAbout) ;c>"gW8
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) .k-6LR
ON_BN_CLICKED(ID_CHANGE, OnChange) 5eE\
X /
//}}AFX_MSG_MAP o2=):2x
r{
END_MESSAGE_MAP() 8sU5MQ5
tjwnFqI
BOOL CCaptureDlg::OnInitDialog() D(;+my2
{ C
#iZAR
CDialog::OnInitDialog(); 2Wu`Dp;&l
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); [\#ANA"
ASSERT(IDM_ABOUTBOX < 0xF000); G0|}s&$yL
CMenu* pSysMenu = GetSystemMenu(FALSE); (# mvDz
if (pSysMenu != NULL) 6T|Z4f|
{ *oeXmY
CString strAboutMenu; j}tM0Ug.U
strAboutMenu.LoadString(IDS_ABOUTBOX); p"c6d'qe
if (!strAboutMenu.IsEmpty()) dq@
*8ui
{ qHp2;
pSysMenu->AppendMenu(MF_SEPARATOR); 0O,;[l
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); !mTq6H12 !
} vBOY[>=
} p^*a>d:d]
SetIcon(m_hIcon, TRUE); // Set big icon H8I)D& cw
SetIcon(m_hIcon, FALSE); // Set small icon AT+l%%
m_Key.SetCurSel(0); "?F[]8F.b
RegisterHotkey(); V8):!
CMenu* pMenu=GetSystemMenu(FALSE); 2J{vfF
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); )c&ya|h
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); s+v9H10R
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); /&Cq-W
return TRUE; // return TRUE unless you set the focus to a control Sh1$AGm
} $ZGup"z)
`kxC#
&HO
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) l?2
{ i+qg*o$
if ((nID & 0xFFF0) == IDM_ABOUTBOX) ;4ybkOD
{ bL`\l!qQx;
CAboutDlg dlgAbout; Exqz$'(W9
dlgAbout.DoModal(); 7%EIn9P
} ZzNHEV
else M9A1
8d|
{ zn 0y`9!n?
CDialog::OnSysCommand(nID, lParam); <Vk}U
} @IsUY(Gu
} ?4U4o<
S*=^I2;
void CCaptureDlg::OnPaint() LdH1sHy*d`
{ 3o[(pfcU
if (IsIconic()) eOiH7{OA,
{ wW p7N
CPaintDC dc(this); // device context for painting =1,!EkG
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ZP!.C&O
// Center icon in client rectangle 3e;|KU
int cxIcon = GetSystemMetrics(SM_CXICON); /KWdIP#
int cyIcon = GetSystemMetrics(SM_CYICON); Nwt[)\W `
CRect rect; n}F$kyI
GetClientRect(&rect); fo+s+Q|Y
int x = (rect.Width() - cxIcon + 1) / 2; Y @'do)
int y = (rect.Height() - cyIcon + 1) / 2; x}pH'S7
// Draw the icon G#e]J;
dc.DrawIcon(x, y, m_hIcon); \fEG5/s}T
} D{Nd2G
else n]Yz<#
{ }a[]I%bu2
CDialog::OnPaint(); XWAIW=.
} 5I2 h(Td
} '%t$mf!nV
%;ED}X
HCURSOR CCaptureDlg::OnQueryDragIcon() NZv 8#
{ |v%$Q/zp&
return (HCURSOR) m_hIcon; ;"0bVs`.^e
} *X$qgSW
>QvqH 2
void CCaptureDlg::OnCancel() C_/eNu\I
{ hWbu
Z%
if(bTray) { 22ey`@`h
DeleteIcon(); y\;oZ]J
CDialog::OnCancel(); ^i#0aq2}
} #*qV kPX
6Aqv*<1=62
void CCaptureDlg::OnAbout() -XL?n/M
{ =23B9WT
CAboutDlg dlg; &odQ&%X
dlg.DoModal(); 4cSs=|m?+
} gizY4~
j
1}|y^oB\-
void CCaptureDlg::OnBrowse() JUA%l
{ M !"Q7>d
CString str; mfI[9G
BROWSEINFO bi; Bf00&PE;
char name[MAX_PATH]; 2= ;ZJ
ZeroMemory(&bi,sizeof(BROWSEINFO)); hfLe<,
bi.hwndOwner=GetSafeHwnd(); sj&(O@~R
bi.pszDisplayName=name; r+[g.`
bi.lpszTitle="Select folder"; K/C}
bi.ulFlags=BIF_RETURNONLYFSDIRS; okRt^qe
LPITEMIDLIST idl=SHBrowseForFolder(&bi); D9NRM;v
if(idl==NULL) +qjZ;5(
return; lshSRir
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ym6Emf]
str.ReleaseBuffer(); sq#C|v/
m_Path=str; U:$zlfV
if(str.GetAt(str.GetLength()-1)!='\\') n8!|}J
m_Path+="\\"; ~h8k4eM
UpdateData(FALSE); ,Aq, f$5V
} c/bT5TIEWs
C $])q`9
void CCaptureDlg::SaveBmp() u;^H =7R
{ [= E=H*j
CDC dc; vFJ4`Gjw(
dc.CreateDC("DISPLAY",NULL,NULL,NULL); HI D6h!
CBitmap bm; UV;I6]$}A7
int Width=GetSystemMetrics(SM_CXSCREEN); l2Py2ZI-b
int Height=GetSystemMetrics(SM_CYSCREEN); b_{+O qI
bm.CreateCompatibleBitmap(&dc,Width,Height); `k
I}p
CDC tdc; KS~Q[-F1P
tdc.CreateCompatibleDC(&dc); &f 'Lll
CBitmap*pOld=tdc.SelectObject(&bm); `O3#/1+
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Om:Gun\%
tdc.SelectObject(pOld); : ciwh
BITMAP btm; -M]/Xv]
bm.GetBitmap(&btm); iWW!'u$+I`
DWORD size=btm.bmWidthBytes*btm.bmHeight; u SZfim@Z7
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ZUB]qzmK
BITMAPINFOHEADER bih; ?UflK
bih.biBitCount=btm.bmBitsPixel; E.:eO??g
bih.biClrImportant=0; w].DLoz
bih.biClrUsed=0; kp[&SKU
c
bih.biCompression=0; lxXF8c>U
bih.biHeight=btm.bmHeight; 5C`Vno~v
bih.biPlanes=1; ',FVT4OMw
bih.biSize=sizeof(BITMAPINFOHEADER); fvTp9T\f3
bih.biSizeImage=size; J^` pE^S
bih.biWidth=btm.bmWidth; )06. dZq\
bih.biXPelsPerMeter=0; C;ha2UV0H
bih.biYPelsPerMeter=0; [C
7X#|
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); <MhODC")
static int filecount=0; ZyC[w7$I2
CString name; >/GYw"KK
name.Format("pict%04d.bmp",filecount++); mrE>o!
name=m_Path+name; uKIR$n"
BITMAPFILEHEADER bfh; ri"=)]
bfh.bfReserved1=bfh.bfReserved2=0; x51p'bNy
bfh.bfType=((WORD)('M'<< 8)|'B'); !_o1;GzK
bfh.bfSize=54+size; 2V9"{F?
bfh.bfOffBits=54; !h1|B7N
CFile bf; =hh,yi
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ @&G
%cW(
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); bsc b
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); aFrZ
;_
bf.WriteHuge(lpData,size); \3U.;}0_X
bf.Close(); 9J49s1
nCount++; =x^IBLHN
} /WAOpf5
GlobalFreePtr(lpData); `a7b,d
if(nCount==1) %I)*5 M6
m_Number.Format("%d picture captured.",nCount); O'~^wu.
else <3k9 y^0
m_Number.Format("%d pictures captured.",nCount); \@6w;tyi
UpdateData(FALSE); zBrqh9%8e
} i"!j:YEo
LGRhCOP:
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) G
@L`[Wu
{ :NwFJc
if(pMsg -> message == WM_KEYDOWN) P]4u`&
{ 14-uy.0[
if(pMsg -> wParam == VK_ESCAPE) @DR?^
q p
return TRUE; )lx;u.$4
if(pMsg -> wParam == VK_RETURN) Q?m= a0g
return TRUE; y7R{6W_U>
} ?y* yl
return CDialog::PreTranslateMessage(pMsg); %`dVX
EO
} Y#-pK)EeU
U3>ES"N
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) kf",/?s2Z
{ H8qAj
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){
3AuLRI
SaveBmp(); L{6Vi&I84[
return FALSE; $>l65)(E\
} <M3&\
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ MIAC'_<-e
CMenu pop; gAGcbepX
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 60p*4>^v
CMenu*pMenu=pop.GetSubMenu(0); zZCssn;[
pMenu->SetDefaultItem(ID_EXITICON); ?O
e,
CPoint pt; t+WUz#i"
GetCursorPos(&pt); XlxB%
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); QfU{W@!h
if(id==ID_EXITICON) Kv\uBMJNW
DeleteIcon(); P<xCg
else if(id==ID_EXIT) Wf$P+i*
OnCancel(); }cy<$=c#E_
return FALSE; _3Q8R}
} A}03s6^i;
LRESULT res= CDialog::WindowProc(message, wParam, lParam); `~W ?a
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2I~a{:O
AddIcon(); u@[JX1&3"n
return res; {f%x8t$
} )d?L*X~y'
tj!~7lo
void CCaptureDlg::AddIcon() _
<pO<S
{ M*jn8OE
NOTIFYICONDATA data; 1QuR7p
data.cbSize=sizeof(NOTIFYICONDATA); v|r#
CString tip; XM*%n8q7#N
tip.LoadString(IDS_ICONTIP); ivl_=
data.hIcon=GetIcon(0); UazUr=|e
data.hWnd=GetSafeHwnd(); <Dp[F|r
strcpy(data.szTip,tip); Nf{tC9l
data.uCallbackMessage=IDM_SHELL; mt3j$r{_
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; }&*,!ES*
data.uID=98; yYZ0o.<&T*
Shell_NotifyIcon(NIM_ADD,&data); ]u O|YLWp
ShowWindow(SW_HIDE); <NX6m|DD
bTray=TRUE; ;=ERm=
} 3H/4$XJB
<Okl.Iz>
void CCaptureDlg::DeleteIcon() ji|tc9#6
{ -u'BK@;
NOTIFYICONDATA data; V IU4QEW`x
data.cbSize=sizeof(NOTIFYICONDATA); RV+0C&0ff
data.hWnd=GetSafeHwnd(); `zRm
"G
data.uID=98; > 1&_-
Shell_NotifyIcon(NIM_DELETE,&data); lMBXD?,,J
ShowWindow(SW_SHOW); _NJq%-,'
SetForegroundWindow(); .
!;K5U
ShowWindow(SW_SHOWNORMAL); !"x&tF
bTray=FALSE; +~\c1|f
} IOOAaa @(
A 4|a{\|$
void CCaptureDlg::OnChange() HOAgRhzE
{ nqyB,vv0
RegisterHotkey(); H#j Z'I
} vwQ6=
7~Md6.FtM
BOOL CCaptureDlg::RegisterHotkey() "*aL(R
{ dD8f`*"*=
UpdateData(); HBnnIbEtF'
UCHAR mask=0; )[hQK_e]
UCHAR key=0; .q7o7J%
if(m_bControl) 9i+SU|;j
mask|=4; rYMHc@a9(
if(m_bAlt) +gOv5Eno-
mask|=2; :CAbGs:56
if(m_bShift) ep2#a#&'
mask|=1; N-Nq*
key=Key_Table[m_Key.GetCurSel()]; GE[J`?E]
if(bRegistered){ #!X4\+)
DeleteHotkey(GetSafeHwnd(),cKey,cMask); VBK9te,A
bRegistered=FALSE; nZ2mY!*
} kMLWF
cMask=mask; \.<V~d?
cKey=key; 564)ha/^(
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); !*C9NX
return bRegistered; <);Nc1
} $R[ggH&
AR-&c 3o
四、小结 Xy(o0/7F9
#2023Zo]
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。