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:
%\r!7@Q
H;fxxu`cS 一、实现方法
Fa_VKAq %v7[[U{T 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:
mJ`A_0 Gkv{~?95 #pragma data_seg("shareddata")
@wC5 g 4E HHOOK hHook =NULL; //钩子句柄
i?:_:"^x UINT nHookCount =0; //挂接的程序数目
e|D;OM static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
/<8N\_wh static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
'X!?vK^]p static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
H0R&2#YD static int KeyCount =0;
Yx inE`u~ static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
3LTcEd #pragma data_seg()
e$uiJNS2 tP%{P"g3^ 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。
S&Ee,((E( Mz;[ +p 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:
dwv 6;x m7GR[MR
BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
R
&4Z*?S cKey,UCHAR cMask)
JiU9CeD3 {
3y~r72J BOOL bAdded=FALSE;
(q7
Ry4- for(int index=0;index<MAX_KEY;index++){
~ Yngkt if(hCallWnd[index]==0){
f5==";eP hCallWnd[index]=hWnd;
-+em!g' HotKey[index]=cKey;
-tI'3oT1 HotKeyMask[index]=cMask;
:4T("a5aM bAdded=TRUE;
LW:LFzp KeyCount++;
tpTAeQ*:d break;
iTg; 7~1pY }
D'hW| }
G>+1*\c return bAdded;
Q9&kJ%Mo }
@hImk`&[N //删除热键
FsGlJ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
I;?X f {
q;wLa#4)J BOOL bRemoved=FALSE;
(x$9~;<S*d for(int index=0;index<MAX_KEY;index++){
k%op>
& if(hCallWnd[index]==hWnd){
M}wXJ8aF? if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
=?(~aV hCallWnd[index]=NULL;
oo$MWN8a>r HotKey[index]=0;
7 #=}:3c HotKeyMask[index]=0;
7RvUH-S[ bRemoved=TRUE;
kzS=g|_ KeyCount--;
UP{j5gR:_ break;
[|3>MZ2/ }
%,*G[#*& }
@i3bgx>_o }
9cv]y# return bRemoved;
xT)psM'CL }
<_./SC [!VOw@uz P~FUS%39"o DLL中的钩子函数如下:
9=/N|m8. .6pOvGKb LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
/+3a n9h {
p=QYc)3F BOOL bProcessed=FALSE;
jUqy8q& if(HC_ACTION==nCode)
Y3ZK%OyPR {
rB%$;<`/ if((lParam&0xc0000000)==0xc0000000){// 有键松开
b( ^^m:(w switch(wParam)
1Ee>S\9t {
?oiKVL"7 case VK_MENU:
ehAu^^Q> MaskBits&=~ALTBIT;
)hj|{h7 break;
(HN4g;{ case VK_CONTROL:
,`8Y8 MaskBits&=~CTRLBIT;
&(xUhX T break;
sxED7,A case VK_SHIFT:
y/@iT8$rp MaskBits&=~SHIFTBIT;
Gr(|Ra. break;
m^{
xd2 default: //judge the key and send message
e^$j5jV break;
^`qPs/b }
O:.,+,BH for(int index=0;index<MAX_KEY;index++){
- &[z\"T if(hCallWnd[index]==NULL)
396R$\q continue;
9''p[V.3 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a1MFjmq {
xnq><4 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
\T-~JQVj bProcessed=TRUE;
|[cdri^?D }
<2P7utdZ }
$~'Tf>e }
rvwy~hO" else if((lParam&0xc000ffff)==1){ //有键按下
b5e@oIK switch(wParam)
77:'I {
:nQp.N*p case VK_MENU:
27#8dV? MaskBits|=ALTBIT;
&(& break;
3^G96]E case VK_CONTROL:
Z-|li}lDr MaskBits|=CTRLBIT;
(clU$m+oXX break;
^@}#me@ case VK_SHIFT:
Uk-HP\C"7 MaskBits|=SHIFTBIT;
Qp!Y.YnPd_ break;
mPmB6q%)] default: //judge the key and send message
-WT3)On break;
(Imp
$ }
hswTn`f for(int index=0;index<MAX_KEY;index++){
FpkXOj?* if(hCallWnd[index]==NULL)
T#iU+)-\% continue;
bx(w:]2 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
\mXqak,y {
KP~-$NR SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
9!t4> bProcessed=TRUE;
cztS]dcf>~ }
s[-]cHQ }
56s*A*z$
; }
.k]#XoE if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
4
10:%WGc for(int index=0;index<MAX_KEY;index++){
r69WD
. if(hCallWnd[index]==NULL)
!s-/0ugZ continue;
[$2qna2VP if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
j+1KNH SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
B/Ba5z"r$ //lParam的意义可看MSDN中WM_KEYDOWN部分
YZ[%uArm }
q 22/_nSC }
B+D`\ Nl o }
~N[|bPRmhE return CallNextHookEx( hHook, nCode, wParam, lParam );
!3KPwI, }
zH+<bEo=1= &HxT41pku 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:
6{^*JC5nj K.h]JD]o BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
#KJZR{ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
$SF3odpt gX"T*d>y 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
T{~M iC6A oUS,+e LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
td/5Bmj {
STp!8mL if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
KW:r;BFx {
u~)%tL //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
J=L`]XE SaveBmp();
'5cZzC
2 return FALSE;
eH
`t \n }
mdt
?:F4Q …… //其它处理及默认处理
WFpl1O73 }
j@V$Mbv
4I1K vN<A ;.r2$/E 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
iDR6?f P rUvwpP"k 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
]kH}lr
yG :28@J?jjO 二、编程步骤
"9u-lcQ\
9 G((wiE 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
KY8^BjY@ j>V"hf 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
%8g$T6E[<2 yx 7loy$[ 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
Q+/R
JM?3@ wz)m{:b< 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
NB3/A"}"02 TVj1C 5、 添加代码,编译运行程序。
&8juS,b % M+s{ l 三、程序代码
w8U2y/:> TLX^~W[gOm ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
_4~k3%w\`l #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
Mf#2.TR #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
\S'cWB #if _MSC_VER > 1000
- =yTAx #pragma once
Za34/ro/T #endif // _MSC_VER > 1000
]zX\8eHp! #ifndef __AFXWIN_H__
IZ|c<#r6 #error include 'stdafx.h' before including this file for PCH
kaV%0Of] #endif
AK%=DVkM #include "resource.h" // main symbols
-.^@9
a> class CHookApp : public CWinApp
b,zR5R^D; {
jDFp31_X public:
2c!h2$w CHookApp();
![qRoYpbg8 // Overrides
rrW! X q // ClassWizard generated virtual function overrides
d4[poi ~ //{{AFX_VIRTUAL(CHookApp)
%+/f'6kR public:
u;$I{b@M] virtual BOOL InitInstance();
gt#MeU virtual int ExitInstance();
iM4mkCdOO //}}AFX_VIRTUAL
#!(Zn:[ //{{AFX_MSG(CHookApp)
YL;SxLY // NOTE - the ClassWizard will add and remove member functions here.
p<<6}3~ // DO NOT EDIT what you see in these blocks of generated code !
3`mC"ab / //}}AFX_MSG
[B.W1 GL! DECLARE_MESSAGE_MAP()
2K5}3<KD/ };
kOo>Iy LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
oB hL}r BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
-Mit$mFn BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
9)8*FahW BOOL InitHotkey();
n5/ZJur BOOL UnInit();
oiIt3<BX #endif
aY3pvOV lqhHbB //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
P?-d[zLA #include "stdafx.h"
qb#V) #include "hook.h"
wY."Lw> 6 #include <windowsx.h>
H&"_} #ifdef _DEBUG
E&}H\zt# #define new DEBUG_NEW
w@<<zItSo #undef THIS_FILE
}])GQ@ static char THIS_FILE[] = __FILE__;
yQ72v' #endif
KFCQYdI`d #define MAX_KEY 100
_N[^Hl`\ #define CTRLBIT 0x04
.&aVx] #define ALTBIT 0x02
^XjvJa #define SHIFTBIT 0x01
C.DoXE7 #pragma data_seg("shareddata")
VQZT.^ HHOOK hHook =NULL;
Vs2 v j UINT nHookCount =0;
>KH(nc$ static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
?h>(&HjWV static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
CNpCe-%& static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
3|z;K,`Fw static int KeyCount =0;
S^_JC static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
RXCygPT #pragma data_seg()
*X"F: 7 HINSTANCE hins;
/9t*CEu\ void VerifyWindow();
VLl&>Pbe- BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
#,Fx@3y\a //{{AFX_MSG_MAP(CHookApp)
x<)!$cg // NOTE - the ClassWizard will add and remove mapping macros here.
;NvhL|R // DO NOT EDIT what you see in these blocks of generated code!
)^QG-IM //}}AFX_MSG_MAP
P17]}F`` END_MESSAGE_MAP()
ul]m>W r(`8A:#d CHookApp::CHookApp()
btkMY<o7 {
-v/?> // TODO: add construction code here,
Hf`&& // Place all significant initialization in InitInstance
Rwi5+;N }
"1pZzad
u8$~N$L CHookApp theApp;
!E(J
]a LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
(\AszLW {
g*\v}6
h BOOL bProcessed=FALSE;
' ]H#0. if(HC_ACTION==nCode)
~T{d9yNW1 {
_s=Pk[e if((lParam&0xc0000000)==0xc0000000){// Key up
3mnL V*aRt switch(wParam)
LqH?3): {
( kD?},Z case VK_MENU:
xf3/<x!B MaskBits&=~ALTBIT;
)l/C_WEK break;
!{|yAt9kP case VK_CONTROL:
LVz%$Cq,0 MaskBits&=~CTRLBIT;
gP"Mu#/D break;
!IrKou)/_ case VK_SHIFT:
;Ef)7GE@\[ MaskBits&=~SHIFTBIT;
c_j)8 break;
w{UKoU default: //judge the key and send message
19.!$; break;
\H'CFAuF }
j4hUPL7
for(int index=0;index<MAX_KEY;index++){
vU=k8 if(hCallWnd[index]==NULL)
[zO(V`S2 continue;
:X'U`jE if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
1\9BO:<K {
OAQ O J' SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
l2_E6U" bProcessed=TRUE;
(Su2\x }
A_$Mt~qKi^ }
5=;I|l, }
z 4OR
UQ else if((lParam&0xc000ffff)==1){ //Key down
OEq e^``! switch(wParam)
pJ@DHj2@
{
KARQKFp!C> case VK_MENU:
;|e 0{Jrz MaskBits|=ALTBIT;
/Gu2@m[r break;
7D1`^,? case VK_CONTROL:
%EhU!K#[ MaskBits|=CTRLBIT;
x#xO { break;
0}3'h#33= case VK_SHIFT:
nJ`a1L{N MaskBits|=SHIFTBIT;
2SCf]& break;
/ o3FK default: //judge the key and send message
T<~[vjA break;
sA7K ;J}) }
"I1M$^8n for(int index=0;index<MAX_KEY;index++)
_1bd)L&dF {
a5g{.:NfO if(hCallWnd[index]==NULL)
C=f(NpyD6 continue;
dg@/HLZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
rnrx%Q {
Z["nY&.sI SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
~.=!5Ry bProcessed=TRUE;
ktJLpZ<0O }
LfSUY }
a[9OtZX< }
S:T>oFUot if(!bProcessed){
])";Z for(int index=0;index<MAX_KEY;index++){
nylIP */ if(hCallWnd[index]==NULL)
5nw9zW
:' continue;
dK`O,[} if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
u>Kvub SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
OehB"[;+ }
Cjb p- }
?B4QTx9B }
DY27' `n6 return CallNextHookEx( hHook, nCode, wParam, lParam );
PH=8'GN }
`6F8Kqltr s9dBXfm BOOL InitHotkey()
{ J%$.D(/ {
D#AxgF_He if(hHook!=NULL){
T$B4DQ nHookCount++;
n8ya$bc return TRUE;
mM%BO(X{= }
x1ex}_\ else
E8 )*HOT_T hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
&BR?;LD if(hHook!=NULL)
XfDQx!gJ nHookCount++;
4vJIO{m return (hHook!=NULL);
cjpl_}'L: }
d$
7b BOOL UnInit()
$e\R5Lu {
Vp94mi#L} if(nHookCount>1){
'0?E|B]Cp% nHookCount--;
,4$J|^T& return TRUE;
? +!?$h }
&^>r<~] BOOL unhooked = UnhookWindowsHookEx(hHook);
>U.uRq if(unhooked==TRUE){
8=Ht+Br nHookCount=0;
.
2Q/D?a hHook=NULL;
\Ki#"%S }
3xY]Lqwv return unhooked;
(]dZ+"O{ }
pr?(5{BL Un+Jz
?Y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
L0~O6*bk {
w+D5a
VJ BOOL bAdded=FALSE;
1(a\$Di for(int index=0;index<MAX_KEY;index++){
`Nr7N#g+u if(hCallWnd[index]==0){
ak&v/%N hCallWnd[index]=hWnd;
#d(r^U#I HotKey[index]=cKey;
3 g&mND HotKeyMask[index]=cMask;
n&JP/P3Y bAdded=TRUE;
Wn5]2D\vkT KeyCount++;
K.I r+SB break;
aT[7L9Cw }
^)I:82"|? }
zvj\n9H return bAdded;
:r=_\? }
WDR!e2G N<WFe5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
r8$TT\?~ {
+UtK2<^:o BOOL bRemoved=FALSE;
=uTV\) for(int index=0;index<MAX_KEY;index++){
<hdCO<
0( if(hCallWnd[index]==hWnd){
$%'z/'o! if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
!8].Z"5J hCallWnd[index]=NULL;
fZC,%p HotKey[index]=0;
/|f]L9)2< HotKeyMask[index]=0;
cx)
EFy. bRemoved=TRUE;
6h%(0=^ KeyCount--;
hFv}JQJw< break;
&rubA }
m` cG&Ar5 }
?9cy5z[ }
u a-p^X`w return bRemoved;
We2=|AB }
^=j$~*(LmX @UX`9]-P void VerifyWindow()
2_C.-;! {
t~Ax#H for(int i=0;i<MAX_KEY;i++){
@U5o;X!qU if(hCallWnd
!=NULL){ DQd&:J@?
if(!IsWindow(hCallWnd)){ YQOGxSi
hCallWnd=NULL; VTU-'q
HotKey=0; 9 )qx0
HotKeyMask=0; %k_JLddlW
KeyCount--; <Coh
&g_
} QG.FW;/L,
} J$oJ
} P%c<0y"O:>
} ~JJv 2
<_~`)t
BOOL CHookApp::InitInstance() dj#<,e\
{ pH%K4bV)8
AFX_MANAGE_STATE(AfxGetStaticModuleState()); be_t;p`3
hins=AfxGetInstanceHandle(); =0Mmxd&o=M
InitHotkey(); o,L !F`W
return CWinApp::InitInstance(); '@FKgy;B)-
} ZyG528O22
(`&g
int CHookApp::ExitInstance() 6O}r4*
{ .Kx5Kh{
VerifyWindow(); A+'j@c\&!
UnInit(); =B\?(
return CWinApp::ExitInstance(); GZ"O%:d
} X!m/I
i$q
R!O'DM+
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;]gph)2cd
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) +J2=\YO
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ VH/_0
#if _MSC_VER > 1000 lH[N*9G(
#pragma once WE3l*7<@
#endif // _MSC_VER > 1000 +Fk.B@KT,
wS4zAu
class CCaptureDlg : public CDialog 2IGAZ%%
{ [30< 0
// Construction MxY CMe4S[
public: vR -/c
BOOL bTray; 2axH8ONMu
BOOL bRegistered; o_cj-
BOOL RegisterHotkey(); E7N1B*KI
UCHAR cKey; _z_uz\#,
UCHAR cMask; "|hmiMdGB
void DeleteIcon(); {d)+a$qj
void AddIcon(); b[$>HB_Na
UINT nCount; +f+\uObi:
void SaveBmp(); PpbW+}aCF
CCaptureDlg(CWnd* pParent = NULL); // standard constructor ?O.&=im_
// Dialog Data |XQ!xFB
//{{AFX_DATA(CCaptureDlg) |
#,b1|af
enum { IDD = IDD_CAPTURE_DIALOG }; B!,})F$x
CComboBox m_Key; 9%4rO\q
BOOL m_bControl; X{)M}WO+r
BOOL m_bAlt; WHU&9N
BOOL m_bShift; %;gD_H4mm
CString m_Path; L%!jj7,9-
CString m_Number; qh=lF_%uj
//}}AFX_DATA Od!j+.OY<
// ClassWizard generated virtual function overrides `jP6;i
//{{AFX_VIRTUAL(CCaptureDlg) !d ZHG
R
public: /0 zk &g
virtual BOOL PreTranslateMessage(MSG* pMsg); {1FYHM^
protected: 7.]ZD`"Bb
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 8Y:bvs.j
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); }lhJt|q c
//}}AFX_VIRTUAL <.Pr+g
// Implementation t.NG]ejZ
protected: TN&1C8xr
HICON m_hIcon; /QTGZb
// Generated message map functions m~#O
~)
//{{AFX_MSG(CCaptureDlg) @}#$<6|
virtual BOOL OnInitDialog(); _,5(HETE2
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); *8Gx_$t&
afx_msg void OnPaint(); ZYg="q0x&
afx_msg HCURSOR OnQueryDragIcon(); ndN8eh:OR
virtual void OnCancel(); k)'c$
afx_msg void OnAbout(); 9hcZbM]
afx_msg void OnBrowse(); 8He^j5
afx_msg void OnChange(); O GSJR`yT
//}}AFX_MSG I( pU_7mw
DECLARE_MESSAGE_MAP() NFsMc0{
}; U1B5gjN
#endif $$AKz\
U1dz:OG>
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file C%l~qf1n
#include "stdafx.h" JTrxh]
#include "Capture.h" HnrT;!C~
#include "CaptureDlg.h" G.1pg]P!
#include <windowsx.h> eo"6 \3z
#pragma comment(lib,"hook.lib") r'-)@|
#ifdef _DEBUG 8\/E/o3
#define new DEBUG_NEW (Zx;GS
#undef THIS_FILE Z3=t"
static char THIS_FILE[] = __FILE__; !\^c9Pg|v
#endif WC0@g5;1[
#define IDM_SHELL WM_USER+1 ,0;E_i7
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); "@DCQ
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); V\^?V|
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; U_Id6J]8
class CAboutDlg : public CDialog `
Y"Rh[C
{ 76(&O
public:
n~k;9`
CAboutDlg(); ++BVn[ 1
// Dialog Data >(p "!
//{{AFX_DATA(CAboutDlg) >i-cR4=LL{
enum { IDD = IDD_ABOUTBOX }; 8g^OXZ
//}}AFX_DATA O]90F
// ClassWizard generated virtual function overrides PKty'}KF
//{{AFX_VIRTUAL(CAboutDlg) j'I$F1>Te
protected: !Tr +: SM
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support mS6L6)] S
//}}AFX_VIRTUAL b>Iqk
// Implementation R@u6mMX{N,
protected: ;VNwx(1l`
//{{AFX_MSG(CAboutDlg) x/R|i%u-s
//}}AFX_MSG G/bWn@
DECLARE_MESSAGE_MAP() >n{(2bcFs
}; `fj(xrI
48Z{wV,
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) n@Y`g{{e~
{ 8!'#B^
//{{AFX_DATA_INIT(CAboutDlg) =AUR]&_B
//}}AFX_DATA_INIT @I_A\ U{
} rX)PN3TD
P
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void CAboutDlg::DoDataExchange(CDataExchange* pDX) %DbL|;z1
{ j"7 z
CDialog::DoDataExchange(pDX); l!EfvqWX
//{{AFX_DATA_MAP(CAboutDlg) Q_x/e|sd
//}}AFX_DATA_MAP ubju uha"
} uL1e?
=(3Qbb1i
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) rc<^6HqD
//{{AFX_MSG_MAP(CAboutDlg) |.0/~Xy-
// No message handlers 7AX<>^
//}}AFX_MSG_MAP ck){N?y
END_MESSAGE_MAP() (>%Ddj6_>
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CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D\jRF-z
: CDialog(CCaptureDlg::IDD, pParent) EgFV
{ (dLt$<F
//{{AFX_DATA_INIT(CCaptureDlg) u`xmF/jhQ
m_bControl = FALSE; hbD@B.PD
m_bAlt = FALSE; |K YON Q
m_bShift = FALSE; #KF:(2
m_Path = _T("c:\\"); .DMeWi
m_Number = _T("0 picture captured."); }5z6b>EI9a
nCount=0; )!SV V ~y
bRegistered=FALSE; xa[<k>r3
bTray=FALSE; 5wmH3g#0
//}}AFX_DATA_INIT mqrP0/sN
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 z | Hl*T
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nU- .a5
} $]<C C `
Oz#$x
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) j7K9T
{ ^/47*vcN5
CDialog::DoDataExchange(pDX); >0k7#q}O
//{{AFX_DATA_MAP(CCaptureDlg) Ok/~E
DDX_Control(pDX, IDC_KEY, m_Key); @NWjYHM[`
DDX_Check(pDX, IDC_CONTROL, m_bControl); <*3{Twa1T
DDX_Check(pDX, IDC_ALT, m_bAlt); MUh)
DDX_Check(pDX, IDC_SHIFT, m_bShift); mk2T
DDX_Text(pDX, IDC_PATH, m_Path); \bw71( Q
DDX_Text(pDX, IDC_NUMBER, m_Number); H$>D_WeJ
//}}AFX_DATA_MAP @C k6s
} }QU9+<Z[r
=;-/( C
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $Q{)AN;m
//{{AFX_MSG_MAP(CCaptureDlg) \$}xt`6p
ON_WM_SYSCOMMAND() s-Q-1lKV,
ON_WM_PAINT() kSv?p1\@&P
ON_WM_QUERYDRAGICON() ;{
u{FL
ON_BN_CLICKED(ID_ABOUT, OnAbout) ywXerz7dUk
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) sesr`,m.,
ON_BN_CLICKED(ID_CHANGE, OnChange) [X ]\^
//}}AFX_MSG_MAP R/R[r> 1)6
END_MESSAGE_MAP() 3Bee6N>
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BOOL CCaptureDlg::OnInitDialog() &Y%Kr`.h
{ A8&yB;T$y
CDialog::OnInitDialog(); r5%K2q{
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); -l8n0P1+
ASSERT(IDM_ABOUTBOX < 0xF000); *M\Qt_[
CMenu* pSysMenu = GetSystemMenu(FALSE); s
Z(LT'}
if (pSysMenu != NULL) ]`0(^)U&
{ N3g[,BE
CString strAboutMenu;
*>ju1f
strAboutMenu.LoadString(IDS_ABOUTBOX); rpu9
if (!strAboutMenu.IsEmpty()) 767xCP
{ IE.JIi^w
pSysMenu->AppendMenu(MF_SEPARATOR); U~-Z`_@^-
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); `Jhu&MWg
} e.hHpjWi?Z
} an={h,
SetIcon(m_hIcon, TRUE); // Set big icon sJg-FVe2
SetIcon(m_hIcon, FALSE); // Set small icon u`dWU}m)
m_Key.SetCurSel(0); #qWa[kB
RegisterHotkey(); 7GY[l3arxv
CMenu* pMenu=GetSystemMenu(FALSE); y;<^[
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ]^$&Ejpe#
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); wcUf?`21,
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); wr,X@y%(!
return TRUE; // return TRUE unless you set the focus to a control y5B4t6M(
} \2 &)b
_?#}@?
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) PeEf=3
{ >i7zV`eK
if ((nID & 0xFFF0) == IDM_ABOUTBOX) NlXHOUw)u
{ <\!+J\YTA
CAboutDlg dlgAbout; Ug*:o d
dlgAbout.DoModal(); }&sF
\b
} GV#"2{t
j
else Bi/=cI
{ +Rn]6}5m\
CDialog::OnSysCommand(nID, lParam); pE@Q
(9`b{
} ]n1@!qa48
} ;V`e%9.
gfG Mu0FjB
void CCaptureDlg::OnPaint() a<7Ui;^@
{ ]f#ZU{A'mt
if (IsIconic()) Tu95qL~^
{ jR`q y<
CPaintDC dc(this); // device context for painting s9svuFb
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); \L}aTCvG
// Center icon in client rectangle J[2c[|[-
int cxIcon = GetSystemMetrics(SM_CXICON); zC#[
int cyIcon = GetSystemMetrics(SM_CYICON); Fl<|/DCg
CRect rect; +#7e?B
GetClientRect(&rect); C-'n4AY^
int x = (rect.Width() - cxIcon + 1) / 2; d|CSWcU
int y = (rect.Height() - cyIcon + 1) / 2; Pd9qY
8CP
// Draw the icon FB-?{78~
dc.DrawIcon(x, y, m_hIcon); "_t2R &A
} u^T)4~(
else .<566g}VP
{ hi4#8W
CDialog::OnPaint(); H!mNHY_fA
} .E}fk,hLB
} /\P3UrQ&]
kSoa'
HCURSOR CCaptureDlg::OnQueryDragIcon() }bIbMEMn
{ hvCX,^LoJ
return (HCURSOR) m_hIcon; hbdq'2!Qr
} 89ivyv;]U
dlkxA^
void CCaptureDlg::OnCancel() },G6IuH%
{ ]`39E"zY
if(bTray) _1_CYrUc
DeleteIcon(); U;f~ Q6iu
CDialog::OnCancel(); F,}wQN
} \nT, NV11
>KXSb@
void CCaptureDlg::OnAbout() s{x{/Bp(KK
{ .vHSKd{
CAboutDlg dlg; O2./?Ye
dlg.DoModal(); e]F4w(*=
} A (z
lX_
t@(S=i7}-
void CCaptureDlg::OnBrowse() 3>;zk#b2
{ MQ7d IUs
CString str; Q${0(#Nu
BROWSEINFO bi; =yo?] ZS
char name[MAX_PATH]; M
^gva?{
ZeroMemory(&bi,sizeof(BROWSEINFO)); <Vucr
bi.hwndOwner=GetSafeHwnd(); JwEQR
bi.pszDisplayName=name; zzOc
# /
bi.lpszTitle="Select folder"; yg34b}m{
bi.ulFlags=BIF_RETURNONLYFSDIRS; B>sSl1opI
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 0\XG;KA
if(idl==NULL) A'Q=DoE
return; w5zrEk#
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); &,E^y,r
str.ReleaseBuffer(); eT8(O36%
m_Path=str; &("HH"!
if(str.GetAt(str.GetLength()-1)!='\\') D >ax<t1K
m_Path+="\\"; Hw[(v[v
UpdateData(FALSE); t* eZe`|
} rC
)pCC
/4x3dwXW@
void CCaptureDlg::SaveBmp() >
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{ V*]cF=W[A
CDC dc; 9w\yWxl
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2P)*Y5`KBH
CBitmap bm; x[XN;W&
int Width=GetSystemMetrics(SM_CXSCREEN); 1=Npq=d
int Height=GetSystemMetrics(SM_CYSCREEN); +pDZ,c,
bm.CreateCompatibleBitmap(&dc,Width,Height); K??(>0Qr}r
CDC tdc; n:QFwwQ`Q;
tdc.CreateCompatibleDC(&dc); l0AVyA4RFV
CBitmap*pOld=tdc.SelectObject(&bm); Qb "\j
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); eru2.(1
tdc.SelectObject(pOld); es]S]}JV
BITMAP btm; o[<lTsw<
bm.GetBitmap(&btm); tx0`#x
DWORD size=btm.bmWidthBytes*btm.bmHeight; g=iPv3MG
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); ]M2<b:yo
BITMAPINFOHEADER bih; 2e~ud9,
bih.biBitCount=btm.bmBitsPixel; #a7 Wx}
bih.biClrImportant=0; \X&LrneR"t
bih.biClrUsed=0; 7-Bttv{
bih.biCompression=0; <zUU`
bih.biHeight=btm.bmHeight; %&EDh2w>
bih.biPlanes=1; )X-~+X91S
bih.biSize=sizeof(BITMAPINFOHEADER); Iu(j"b#
bih.biSizeImage=size; t<sy7e='
bih.biWidth=btm.bmWidth; N=4`jy =
bih.biXPelsPerMeter=0; QN!.~>
bih.biYPelsPerMeter=0; 1 /@lZ
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); g+CTF67
static int filecount=0; ::'DWD1
CString name; uh,~CvXU]
name.Format("pict%04d.bmp",filecount++); >wsS75n1
name=m_Path+name; T\}?
BITMAPFILEHEADER bfh; t4HDt\}&k~
bfh.bfReserved1=bfh.bfReserved2=0; St9+/Md=jQ
bfh.bfType=((WORD)('M'<< 8)|'B'); Y ;qA@|
bfh.bfSize=54+size; [Ol}GvzJ7
bfh.bfOffBits=54; #fT1\1[]
CFile bf; ~r(/)w\
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ (y^[k {#
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); o]Ln:k l
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Y<1]{4Wt
bf.WriteHuge(lpData,size); ';T=kS<^_
bf.Close(); #p<1@,
nCount++; uLr9*nxd
} <\0+*`">g
GlobalFreePtr(lpData);
LHy-y%?i
if(nCount==1) gD$bn=
m_Number.Format("%d picture captured.",nCount); x !)[l;
else "v%|&@
m_Number.Format("%d pictures captured.",nCount); 6:PQkr
UpdateData(FALSE); ;4E(n
} J})#43P
#
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BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) pS [nKcyj
{ >LqW;/&S<
if(pMsg -> message == WM_KEYDOWN) :i{$p00
G
{ YGAB2`!U
if(pMsg -> wParam == VK_ESCAPE) zpPzXQv]/
return TRUE; i^Ba?r;*
if(pMsg -> wParam == VK_RETURN) Kterp%J?
return TRUE; SM3qPlsF
} ^Ob#B!=
return CDialog::PreTranslateMessage(pMsg); W
PDL$y
} *^h$%<QI
D I`
M
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) f[S$Gu4-
{
N\Nw mx
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ SLCV|@G
SaveBmp(); P.8CFlX
return FALSE; V%kZ-P*
} zxo0:dyw7
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ A'jw;{8NpF
CMenu pop; l8O12
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ,2*^G;J1
CMenu*pMenu=pop.GetSubMenu(0); C3m](%?
pMenu->SetDefaultItem(ID_EXITICON); >9?BJv2
CPoint pt; y[L7=Td
GetCursorPos(&pt); K/^70;/!.
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); d5b \kR r
if(id==ID_EXITICON) 4tZnYGvqe
DeleteIcon(); (YOp
else if(id==ID_EXIT) f76bEe/B9
OnCancel(); 0u,OW
return FALSE; fe,A\W&8
} $ U~3$*R
LRESULT res= CDialog::WindowProc(message, wParam, lParam); f;Cu@z{b
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) Kz v*`
AddIcon(); sg=mkkD!g
return res; =%wwepz6
} }Y{aVn&C
;'\#+GZ9p
void CCaptureDlg::AddIcon() J}c`\4gD
{ X?B9Z8
NOTIFYICONDATA data; 9!aQ@ J^
data.cbSize=sizeof(NOTIFYICONDATA); NrC(.*?m
CString tip; h[Hn*g
tip.LoadString(IDS_ICONTIP); M=HP!hn
data.hIcon=GetIcon(0); HOEjLwH
data.hWnd=GetSafeHwnd(); )JYt zc
strcpy(data.szTip,tip); vmV<PK-
data.uCallbackMessage=IDM_SHELL; Glt%%TJb
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; $d@_R^]X
data.uID=98; 'Fe1]B"Y
Shell_NotifyIcon(NIM_ADD,&data); Ax'jNol
ShowWindow(SW_HIDE); 8ec6J*b
bTray=TRUE; VaLx- RX
} ao@"j}c
{nl]F
void CCaptureDlg::DeleteIcon() yUZ;keQ_Tw
{ c(]NpH
in
NOTIFYICONDATA data; 'Z<V(;W
data.cbSize=sizeof(NOTIFYICONDATA); btQDG
data.hWnd=GetSafeHwnd(); :RYh@.
data.uID=98; I eQF+Xz
Shell_NotifyIcon(NIM_DELETE,&data); {;iG}j K
ShowWindow(SW_SHOW); Z$8X1(o
SetForegroundWindow(); 3A~53W$M
ShowWindow(SW_SHOWNORMAL); n'dxa<F2|
bTray=FALSE; Pk94O
} 3I rmDT
Do&em8i
z
void CCaptureDlg::OnChange() R0 g-
{ 1|+Zmo"
RegisterHotkey(); ka3(sctZ5
} 3L;GfYr0
ujo3"j[b
BOOL CCaptureDlg::RegisterHotkey() l1Zf#]x
{ ) \iOwA
UpdateData(); hx'p0HDta
UCHAR mask=0; @M:Uf7
UCHAR key=0; uk8vecj
if(m_bControl) \~3g*V
mask|=4; jz\LI
if(m_bAlt) yNwYP%"y
mask|=2; #i#4h<R
if(m_bShift) @0XqUcV
mask|=1; [sM~B
key=Key_Table[m_Key.GetCurSel()]; qre.^6x
if(bRegistered){ =bVaB<!
DeleteHotkey(GetSafeHwnd(),cKey,cMask); DOr()X
bRegistered=FALSE; aNqhxvwf
} YW|KkHi*
cMask=mask; "IK QFt'
cKey=key; q#8$@*I
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); H*l2,0&W
return bRegistered; Cg~GlZk}
} Z+mesj?.
5#v
四、小结 /uTU*Oe
]5!}S-uJq
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。