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:
56t9h/y
16ahU$@- 一、实现方法
7Vd"k;:X mIgc)" 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:
UjxEbk5>^ +?Vj}p; #pragma data_seg("shareddata")
a~E@scD HHOOK hHook =NULL; //钩子句柄
Jn3cU UINT nHookCount =0; //挂接的程序数目
(? j $n?p static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
<qjNX-| static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
CZ"~N` static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
<"F\&M`G static int KeyCount =0;
|C}n]{*| static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
jN
9|q #pragma data_seg()
l?Vm/YXb n+1!/H=d 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。
$BHbnsaQ ]5| o8. 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:
6Y?%G>$6 Bu|Uz0Y BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
=OY&;d!C cKey,UCHAR cMask)
!lxs1!: {
8axz`2 ` BOOL bAdded=FALSE;
.,Qj3 for(int index=0;index<MAX_KEY;index++){
b-4gHW if(hCallWnd[index]==0){
W *?mc2;/ hCallWnd[index]=hWnd;
y.,S}7l: HotKey[index]=cKey;
vxuxfi8x HotKeyMask[index]=cMask;
dQP7CP bAdded=TRUE;
[O~'\Q KeyCount++;
0-Z
sV3I& break;
/IQl }
Gt;@.jY& }
YdsY2 return bAdded;
YbCqZqk }
A8Z2o\+ //删除热键
UrAg*v!Qy BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
vn
oI.;H, {
C- 25\ BOOL bRemoved=FALSE;
&?+ vHE} for(int index=0;index<MAX_KEY;index++){
%1f, 8BM if(hCallWnd[index]==hWnd){
?naPti1GX if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
O5}/OH|j hCallWnd[index]=NULL;
$BIQ#T>qK HotKey[index]=0;
r(UEPGu|~l HotKeyMask[index]=0;
Xxl>,QUA bRemoved=TRUE;
4a'O#;ho KeyCount--;
!r=^aa(\ break;
9{OH%bF }
D@]gc&JN[ }
t:A,pT3 }
TTNgnP return bRemoved;
#Bo/1G= }
oECM1'=Bf -
0t
1\v$8pP+ DLL中的钩子函数如下:
sU7>q}! L,@OOBD LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
sOyWsXd+R' {
{HgW9N( BOOL bProcessed=FALSE;
H<$.AC\zn if(HC_ACTION==nCode)
= mnjIp {
3F%Qq7v if((lParam&0xc0000000)==0xc0000000){// 有键松开
kBPFk t2 switch(wParam)
tykA69X\W {
6~ g:"} case VK_MENU:
vBUl6EmWu MaskBits&=~ALTBIT;
3YY<2< break;
)9,*s!)9 case VK_CONTROL:
Y`FGD25` MaskBits&=~CTRLBIT;
uj.~/W1,! break;
vS~y~ uU%6 case VK_SHIFT:
Z=: oIAe MaskBits&=~SHIFTBIT;
DdI7%?hK break;
gbc^Lb default: //judge the key and send message
nG#lrYZw break;
ivdw1g|)h }
h;vD"!gP for(int index=0;index<MAX_KEY;index++){
0F'75 if(hCallWnd[index]==NULL)
)k&pp^q\ continue;
`Tzqvnn if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ArkFC {
[7Nn%eZC
SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
inBd.%Yr bProcessed=TRUE;
=q|fe%# }
oH+UuP2a-J }
?`F")y }
hp(n;(OR else if((lParam&0xc000ffff)==1){ //有键按下
X$JO<@x switch(wParam)
dE5DH~ldV {
*D1fSu! case VK_MENU:
*8p\.za1 MaskBits|=ALTBIT;
PF .sM( break;
l,/q#)5[ case VK_CONTROL:
;U<)$5 MaskBits|=CTRLBIT;
sF;1)7]Pq break;
[Hdk=p case VK_SHIFT:
| -Di/. MaskBits|=SHIFTBIT;
*9^CgLF break;
+Z XGT default: //judge the key and send message
)EO/P+& break;
kyJv,!}; }
n#3y2,Ml for(int index=0;index<MAX_KEY;index++){
HkvCQ H if(hCallWnd[index]==NULL)
P7\(D` continue;
Vm8;{S q if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[v-?MS {
zJ9ZqC] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
7\ff=L-b bProcessed=TRUE;
|iM*}Ix- }
CjQ_oNI }
QBto$!}) }
q1dYiG.-Z if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
n 2#uH for(int index=0;index<MAX_KEY;index++){
@7lZ{jV$ if(hCallWnd[index]==NULL)
!^axO continue;
_;01/V"q6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
>mF`XbS SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
]^
O<WD //lParam的意义可看MSDN中WM_KEYDOWN部分
2L<TqC{,- }
P>N\q }
$Z28nPd/ }
c<&+[{| return CallNextHookEx( hHook, nCode, wParam, lParam );
66L*6O4 }
<2cq 0*$ FeV=4tsy 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:
5RLK]= uaDU+ywL BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
R:.7c(s BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
dN*<dz+4r WZO#(eO` 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:
bkOm/8k|4 }4
$EN LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
G~esSL^G/ {
;?:,L if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
P;_dilG {
U'lmQrF! //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
S?3{G@!
SaveBmp();
{Zseu$c
return FALSE;
Y#t"..mc' }
r*p%e\ 3 …… //其它处理及默认处理
JnsXEkM) }
Fk9(FOFg z:fhq:R( (/KF;J^M 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。
fglZjT un9o~3SF< 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。
{(MG:
B .A `:o 二、编程步骤
AMm O+E? pF !vW 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";
T ]zjJwa ~Igo
8ykl 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
5g5pzww a #0{tZd 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;
'Qfy+_0 P<(mH=K 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;
Lul?@>T =N0cz% 5、 添加代码,编译运行程序。
v}mmY>M% uJ y@ 三、程序代码
pxC5a i
CFA> ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
Arv8P
P^' #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
(1HN, iJy #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
sI'HS+~pU #if _MSC_VER > 1000
_
o(h]G1]. #pragma once
CyU>S}t #endif // _MSC_VER > 1000
"O
'I #ifndef __AFXWIN_H__
x}[` - #error include 'stdafx.h' before including this file for PCH
;(,Fe/wvC #endif
dEp=;b s #include "resource.h" // main symbols
sg2C_]i,H class CHookApp : public CWinApp
-XyuA:pxx {
Ol@ZH_ public:
tSYnc7 CHookApp();
1GdgF?4 // Overrides
s#fmGe"8 // ClassWizard generated virtual function overrides
K\ ]r //{{AFX_VIRTUAL(CHookApp)
]]ZBG<# public:
zK92:+^C virtual BOOL InitInstance();
f*~fslY,o virtual int ExitInstance();
f#nmr5F //}}AFX_VIRTUAL
Oe!&Jma*> //{{AFX_MSG(CHookApp)
=R"tnjR // NOTE - the ClassWizard will add and remove member functions here.
5b'S~Qj#r$ // DO NOT EDIT what you see in these blocks of generated code !
J"MJVMo$T //}}AFX_MSG
d!:SoZ DECLARE_MESSAGE_MAP()
q}i87a;m };
xL"%2nf LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
2Qj)@&zKe# BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
}+J@;: BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
-tdG}Gu BOOL InitHotkey();
n}?G!ySg BOOL UnInit();
y<b0z\ #endif
#w@Pa L iS x TZ5q*Hqx //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
U8KY/!XZ #include "stdafx.h"
Fm':sd)'X #include "hook.h"
"tARJW #include <windowsx.h>
cg%CYV) #ifdef _DEBUG
O :^[4$~ #define new DEBUG_NEW
lg+g:o #undef THIS_FILE
A~V\r<N
j static char THIS_FILE[] = __FILE__;
&L]*]Xz; #endif
%5gJ6>@6Z #define MAX_KEY 100
zOdKB2_J7 #define CTRLBIT 0x04
I>#ChV)(# #define ALTBIT 0x02
={'($t%|T #define SHIFTBIT 0x01
dDbC0} x/ #pragma data_seg("shareddata")
qS|VUy4 HHOOK hHook =NULL;
G |^X:+ UINT nHookCount =0;
pQ{t< > static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
*Mc\7D static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
M3 u8NRd5| static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
ooSd6;' static int KeyCount =0;
Dys"|,F static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
A#:
c #pragma data_seg()
iXRt9)MT{ HINSTANCE hins;
h';v'"DoW` void VerifyWindow();
v6\2mc. BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
rC `s;w //{{AFX_MSG_MAP(CHookApp)
|l(lrJ{ // NOTE - the ClassWizard will add and remove mapping macros here.
Xy<f_ // DO NOT EDIT what you see in these blocks of generated code!
J)|K/W9 //}}AFX_MSG_MAP
0 _}89:- END_MESSAGE_MAP()
MToQ8qKs *8H;KGe= CHookApp::CHookApp()
L0 2~FT {
jgw'MpQm{ // TODO: add construction code here,
$yFuaqG`Wo // Place all significant initialization in InitInstance
l:yAgm` }
!!%nl_I( $ow`)?sh CHookApp theApp;
O>5 u5n LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
L6=RD<~C {
R6mJFE*6T9 BOOL bProcessed=FALSE;
^>{;9lo< if(HC_ACTION==nCode)
uN3J)@;_ {
_hL4@C if((lParam&0xc0000000)==0xc0000000){// Key up
TbAdTmW switch(wParam)
pY>-N {
*"{Z?< 3 case VK_MENU:
bvS\P!m\c MaskBits&=~ALTBIT;
-f|^}j? break;
!&jgcw/E case VK_CONTROL:
Lj-&TO}OZ MaskBits&=~CTRLBIT;
.x?zky^ break;
@/NZ>. case VK_SHIFT:
k:)u7A+ MaskBits&=~SHIFTBIT;
<L
( = break;
vP)~j1 default: //judge the key and send message
UA4d|^ev break;
&|"I0|tJ }
1\{U<Oli for(int index=0;index<MAX_KEY;index++){
)r,R!8 if(hCallWnd[index]==NULL)
~2DV{dyj continue;
C*6)Ut ' if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
seU^IC< {
l%U_iqL& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
(Cd{#j< bProcessed=TRUE;
jy@i(@Z }
"mK i$FV }
C5PBfn<j }
-hFyqIJW else if((lParam&0xc000ffff)==1){ //Key down
LI;Efy L switch(wParam)
{%~4RZA {
_AB9BQm case VK_MENU:
n.XhK_6n]M MaskBits|=ALTBIT;
agU!D[M_G break;
CC(*zrOd- case VK_CONTROL:
<6O_t,K] MaskBits|=CTRLBIT;
b
hr E break;
r{2].31' case VK_SHIFT:
P:,
x?T?J^ MaskBits|=SHIFTBIT;
fDEu%fUYZ break;
Z*9]:dG:! default: //judge the key and send message
)!}-\5F break;
1LId_vJtJ }
^0tf1pV2 for(int index=0;index<MAX_KEY;index++)
O][Nl^dl {
TFYT vUn if(hCallWnd[index]==NULL)
"3i80R\w`F continue;
71/ m.w if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
}B9~X {
'tu@`7* SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
hKZ`DB4 bProcessed=TRUE;
^?7dOW }
Tq\~<rEo }
|!?WQ[ }
@6
;oN if(!bProcessed){
^2C /!Y< for(int index=0;index<MAX_KEY;index++){
6%\Q*r*N if(hCallWnd[index]==NULL)
24jtJC,7 continue;
7.e7Fi{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
E R]sDV SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
$ ~,}yh; }
T4~`e_ }
%`?;V;{= }
M,t*nG return CallNextHookEx( hHook, nCode, wParam, lParam );
FJf~vAQ }
_))I.c=v ~3bZ+*H> BOOL InitHotkey()
0939i_ {
) Kc%8hBv if(hHook!=NULL){
/$9BPjO{ nHookCount++;
JS/M~8+Et return TRUE;
{+"g':>< }
C1T=O else
HUJ|-)"dw hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
OpK.Lsd0y if(hHook!=NULL)
p"[O#*p nHookCount++;
w!WRa8C return (hHook!=NULL);
{4:
-0itG }
3$c (M99r BOOL UnInit()
Sk/#J!T8{ {
n1*&%d'7 if(nHookCount>1){
Xb]=:x( nHookCount--;
6x_T@ return TRUE;
.!(,$'(@= }
dU]i-NF BOOL unhooked = UnhookWindowsHookEx(hHook);
2'wr={>W if(unhooked==TRUE){
PMgQxM*h nHookCount=0;
xMDrE? hHook=NULL;
I?a8h`WS+ }
M o}H_8y return unhooked;
FUaI2 }
`,wcQ JbE?a[Eg? BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
y(bsCsV& {
[J0*+C9P* BOOL bAdded=FALSE;
Ue(r}* for(int index=0;index<MAX_KEY;index++){
KNg8HYFW\ if(hCallWnd[index]==0){
RT%x&j hCallWnd[index]=hWnd;
`gBD_0<T7 HotKey[index]=cKey;
h|bqyu HotKeyMask[index]=cMask;
[6D>f?z bAdded=TRUE;
,e9CJ~a KeyCount++;
+}Xr1fr{jw break;
u]HS(B,ht }
ngP7'1I }
/7bw: h; return bAdded;
u(W^Nou/+ }
Kw)KA^KF ]}Pl%. BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
]Ap` {
n`]l^qE BOOL bRemoved=FALSE;
vXephR' for(int index=0;index<MAX_KEY;index++){
{|s/]W if(hCallWnd[index]==hWnd){
SO`dnf if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
+p3 Z#KoC hCallWnd[index]=NULL;
|K%}}g[<e; HotKey[index]=0;
EYG"49
c HotKeyMask[index]=0;
a\=-D: bRemoved=TRUE;
d7* CwY9" KeyCount--;
}mKwFVZ break;
(Akd8}nf~ }
_R)&k%i} }
Yv^p=-E }
KxY$PgcC return bRemoved;
@%c81rv? }
sxo;/~.p lzEb5mg void VerifyWindow()
c<?[d!vI {
(^LS']ybc for(int i=0;i<MAX_KEY;i++){
H)E^!eo if(hCallWnd
!=NULL){ x=.tiM {#
if(!IsWindow(hCallWnd)){ [B,'=,Hbs
hCallWnd=NULL; e&0NK8+
HotKey=0; , ;%yf?
HotKeyMask=0; #4><r.v3
KeyCount--; vf<UBa;Xm
} ACb/ITu
} c`
,
2h#
} nd:E9:
} 3y ryeS
zie=2
BOOL CHookApp::InitInstance() K#!X><B'
{ r,4lqar;E
AFX_MANAGE_STATE(AfxGetStaticModuleState()); !2$ z *C2;
hins=AfxGetInstanceHandle(); t,h{+lYU
InitHotkey(); o2aM#Q
return CWinApp::InitInstance(); T1W:>~T5#
} y])).p P
zmiZ]uq
int CHookApp::ExitInstance() i.y=8GxY
{ -f9]v9|l
VerifyWindow(); QL97WK\$
UnInit(); #f*g]p{
return CWinApp::ExitInstance(); @*(4dt:V
} .'1SZe7O
&cu!Hx
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file >.<ooWw
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) rk|a5-i
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ "'a* [%
#if _MSC_VER > 1000 iY~rne"l
#pragma once u[")*\CP
#endif // _MSC_VER > 1000 LnFWA0y
)\ZzTS
class CCaptureDlg : public CDialog _1L(7|^~y[
{ j1q[c,
// Construction gg^1b77hT
public: eEl.. y
BOOL bTray; vfw A$7N
BOOL bRegistered; bA@P}M)X
BOOL RegisterHotkey(); V*RdDF7
UCHAR cKey; 33K*qaRAD
UCHAR cMask; J!TBREK
void DeleteIcon(); l&W;b6L
void AddIcon(); j U[
O
UINT nCount; ? 2#(jZ# 2
void SaveBmp(); #yW\5)
CCaptureDlg(CWnd* pParent = NULL); // standard constructor lA^+Flh
// Dialog Data FT89*C)oD
//{{AFX_DATA(CCaptureDlg) yGj.)$1},@
enum { IDD = IDD_CAPTURE_DIALOG }; >&S0#>wmyG
CComboBox m_Key; z0bJ?~w,
BOOL m_bControl; +fNvNbtA
BOOL m_bAlt; mC[UXN/
BOOL m_bShift; h}L}[
CString m_Path; oVOm_N
CString m_Number; +4qU>
//}}AFX_DATA . +
// ClassWizard generated virtual function overrides :+rUBYWx
//{{AFX_VIRTUAL(CCaptureDlg) P"_$uO( 5x
public: #VVr"*7$
virtual BOOL PreTranslateMessage(MSG* pMsg); 3c3OG.H$8
protected: |=dC
)Azs
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 7KjUW\mN2Z
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); Anm=*;*M`
//}}AFX_VIRTUAL j&R+2%
// Implementation o<i,*y88
protected: )ChqATKg
HICON m_hIcon; 5nlMrK
// Generated message map functions Q.U$nph\%d
//{{AFX_MSG(CCaptureDlg) ,*I@
virtual BOOL OnInitDialog(); h8e757z
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); EZDy+6b
afx_msg void OnPaint(); qk/:A+
afx_msg HCURSOR OnQueryDragIcon(); [
ho(z30k
virtual void OnCancel(); SHVWwoieT
afx_msg void OnAbout(); q'Wr[A40j
afx_msg void OnBrowse(); |JF@6
afx_msg void OnChange(); dt}_D={Be
//}}AFX_MSG r|Z5Xc
DECLARE_MESSAGE_MAP() gJ$K\[+
}; [K/m
#endif R(Kk{c:-@
)!BsF'uVQ
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file
D L'iS
#include "stdafx.h" aGZi9O7G}
#include "Capture.h" 8;14Q7,S
#include "CaptureDlg.h" <^?1uzxH8A
#include <windowsx.h> 4NN$( S-W
#pragma comment(lib,"hook.lib") q@hzo>[
#ifdef _DEBUG An*~-u9m
#define new DEBUG_NEW M$4[)6Y
#undef THIS_FILE u"1rF^j6k
static char THIS_FILE[] = __FILE__; =3ioQZ^Vz
#endif KnhoaBB
#define IDM_SHELL WM_USER+1 RwI[R)k
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); )rW&c-'
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); w;UqEC V
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; Ian[LbCWB
class CAboutDlg : public CDialog 1NQbl+w#I
{ CIU1R;
public: G;NF5`*4mc
CAboutDlg(); GeszgtK{T
// Dialog Data &8.NT~"Gg
//{{AFX_DATA(CAboutDlg) X$%4$
enum { IDD = IDD_ABOUTBOX }; L( T12s
//}}AFX_DATA
X\$ 0
// ClassWizard generated virtual function overrides qyC=(v
//{{AFX_VIRTUAL(CAboutDlg) )^||\G
protected: H{J'#
9H
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support GdV1^`M6
//}}AFX_VIRTUAL ~qe%Yq
// Implementation jls-@Wl
protected: akw,P$i
//{{AFX_MSG(CAboutDlg) z#BR5jF
//}}AFX_MSG su*Pk|6%
DECLARE_MESSAGE_MAP() ljl^ GFo
}; sf&]u;^DY
.ERO|$fv
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) T\~x.aH`^
{ zOg7raIa
//{{AFX_DATA_INIT(CAboutDlg) Z{&cuo.@<]
//}}AFX_DATA_INIT {*{Ox[Nh{
} aQ:5d3m0
__mF?m
void CAboutDlg::DoDataExchange(CDataExchange* pDX) p<=$&*
{ PkI:*\R
CDialog::DoDataExchange(pDX); )K &(
//{{AFX_DATA_MAP(CAboutDlg) %p%%~ewmx
//}}AFX_DATA_MAP y;/VB,4V
} z5ij(RE]
(vT+IZEI
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 2eMTxwt*S
//{{AFX_MSG_MAP(CAboutDlg) x _c[B4Tw
// No message handlers jy-{~xdg[
//}}AFX_MSG_MAP oudxm[/U
END_MESSAGE_MAP() "DYJ21Ut4
pK0"%eA
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) P.gb1$7<
: CDialog(CCaptureDlg::IDD, pParent) \rv<$d@L
{ '],J$ge
//{{AFX_DATA_INIT(CCaptureDlg) Omd .9
m_bControl = FALSE; k:7(D_
m_bAlt = FALSE; T=ev[ mS
m_bShift = FALSE; ;*MLRXq
m_Path = _T("c:\\"); |\pbir
m_Number = _T("0 picture captured."); F$)[kP,wtO
nCount=0; j]`PSl+w
bRegistered=FALSE; K6R.@BMN
bTray=FALSE; }_ 9Cxji
//}}AFX_DATA_INIT 4EY)!?;
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ;+ "+3
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); nr<4M0tIp
} e%b6(%
$< JaLS
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) z<Nfm
{ q<M2,YrbAI
CDialog::DoDataExchange(pDX); 7Op>i,HZk\
//{{AFX_DATA_MAP(CCaptureDlg) Hj}K{20
DDX_Control(pDX, IDC_KEY, m_Key); LGn:c;
DDX_Check(pDX, IDC_CONTROL, m_bControl); \kZ?
DDX_Check(pDX, IDC_ALT, m_bAlt);
094o'k
DDX_Check(pDX, IDC_SHIFT, m_bShift); \.-bZ$
DDX_Text(pDX, IDC_PATH, m_Path); hv?9*tLh0
DDX_Text(pDX, IDC_NUMBER, m_Number); Abc)i7!.,.
//}}AFX_DATA_MAP ~A\GT$
} ?{[
v+t#
`x*Pof!Io
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) p>huRp^w
//{{AFX_MSG_MAP(CCaptureDlg) g%=z_
ON_WM_SYSCOMMAND() -Fe?R*-g
ON_WM_PAINT() #"G]ke1l$
ON_WM_QUERYDRAGICON() 2GDD!w#!j
ON_BN_CLICKED(ID_ABOUT, OnAbout) JJN.ugT}1
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) ;>Ib^ov
ON_BN_CLICKED(ID_CHANGE, OnChange) :/nj@X6
//}}AFX_MSG_MAP EFM5,gB.m
END_MESSAGE_MAP() %iQD /iT5
U2W|:~KM
BOOL CCaptureDlg::OnInitDialog() J| w>a
{ <<][hQs
CDialog::OnInitDialog(); nWw":K<@Q_
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Hquc
o
ASSERT(IDM_ABOUTBOX < 0xF000); Li4zTR|U
CMenu* pSysMenu = GetSystemMenu(FALSE); Fj2BnM3#
if (pSysMenu != NULL) 3EPv"f^V
{ p$]3'jw
CString strAboutMenu; 0Qf,@^zL*
strAboutMenu.LoadString(IDS_ABOUTBOX); u 7>],<
if (!strAboutMenu.IsEmpty()) {8W'%\!=
{ z7fp#>uw
pSysMenu->AppendMenu(MF_SEPARATOR); ~qTx|",
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); 8}O lL,fP
} ivJ@=pd)B
} lR6@
xJd:@
SetIcon(m_hIcon, TRUE); // Set big icon I 5^!y
SetIcon(m_hIcon, FALSE); // Set small icon rlOAo`hd
m_Key.SetCurSel(0); EM(gmWHij
RegisterHotkey(); Ng2twfSl$
CMenu* pMenu=GetSystemMenu(FALSE); 12b(A+M
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); w;4<h8Wn5
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); m[~y@7AK<
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); P@V0Mi),
return TRUE; // return TRUE unless you set the focus to a control 0ypNUG}
} aC8} d
( R=:X+ k
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) V^bwXr4f
{ z]_wjYn Z
if ((nID & 0xFFF0) == IDM_ABOUTBOX) yEqps3%
{ Y!w`YYKP
CAboutDlg dlgAbout; f@wquG'
dlgAbout.DoModal(); t%/&c::(6
} rr],DGg+B]
else +V ;l6D
{ hF~n)oQ
CDialog::OnSysCommand(nID, lParam); 2lH&
} =(j1rW!
} X9W@&zQ
pP&7rRhw
void CCaptureDlg::OnPaint() U)]oO
{ l*Gvf_UH
if (IsIconic()) )l C)@H}
{ 5y.WMNNv{
CPaintDC dc(this); // device context for painting [Kg+^N%+
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); *5C7d*'
// Center icon in client rectangle WUn]F~Lt
int cxIcon = GetSystemMetrics(SM_CXICON); JzQ_{J`k
int cyIcon = GetSystemMetrics(SM_CYICON); t6"%3#s
CRect rect; _YhES-Ff
GetClientRect(&rect); ?Jm^<
int x = (rect.Width() - cxIcon + 1) / 2; $f
<(NM6?
int y = (rect.Height() - cyIcon + 1) / 2; r,73C/*&/
// Draw the icon V(I8=rVH
dc.DrawIcon(x, y, m_hIcon); tKOmoC
} ?=Z?6fw
else =7=]{Cx[
{ x)DMPVB<
CDialog::OnPaint(); X]TG<r
} @Md/Q~>
} ,f%S'(>w
D0-3eV-
HCURSOR CCaptureDlg::OnQueryDragIcon() Ua: sye
{ <44G]eb
return (HCURSOR) m_hIcon; {UI+$/v#
} n:?a$Ldgm
g
wRZ%.Cn
void CCaptureDlg::OnCancel() S&wMrQ
{ YoNDf39
if(bTray) 6Pl<'3&
DeleteIcon(); Gx/Oi)&/
CDialog::OnCancel(); 6@5+m
0`u3
} V~3a!-m\
`4J$Et%S
void CCaptureDlg::OnAbout() b{&)6M)zo
{ +{.WQA}z\
CAboutDlg dlg; =&]g "a'
dlg.DoModal(); )*J^K?!S
} p8O2Z?\
PJ%C N(0
void CCaptureDlg::OnBrowse() QA`sx
{ <iC(`J$D
CString str; 77f9(~ZnT
BROWSEINFO bi; BX7kO0j
char name[MAX_PATH]; Xl#ggub?
ZeroMemory(&bi,sizeof(BROWSEINFO)); e X|m
bi.hwndOwner=GetSafeHwnd(); UB@+ck
bi.pszDisplayName=name; ]w8(&,PP
bi.lpszTitle="Select folder"; EV%gF
bi.ulFlags=BIF_RETURNONLYFSDIRS; ^6V[=!& H
LPITEMIDLIST idl=SHBrowseForFolder(&bi); [RhO$c$[\
if(idl==NULL) YjKxb 9
return; #q=Efn'
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8cIKvHx
str.ReleaseBuffer(); l'_r:b
m_Path=str; <\^8fn
if(str.GetAt(str.GetLength()-1)!='\\') m-#2n?
z-
m_Path+="\\"; uy$e?{Jf
UpdateData(FALSE);
ZBp/sm
} hHnYtq
{JMVV_}n
void CCaptureDlg::SaveBmp() ]N?kG`[
{ HIZe0%WPw
CDC dc; eD6fpe\(
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 2E'UZ
m
CBitmap bm; >|UOz&
int Width=GetSystemMetrics(SM_CXSCREEN); jQB9j
int Height=GetSystemMetrics(SM_CYSCREEN); @:#eb1<S
bm.CreateCompatibleBitmap(&dc,Width,Height); +cN8Y}V
CDC tdc; UZ+<\+q3^
tdc.CreateCompatibleDC(&dc); %*}(}~
CBitmap*pOld=tdc.SelectObject(&bm); UP,c |
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); r;N|)
tdc.SelectObject(pOld); Rima;9.Y0
BITMAP btm; `b$.%S8uj=
bm.GetBitmap(&btm); xwo<' xT
DWORD size=btm.bmWidthBytes*btm.bmHeight; t%=tik2|7
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); *$g-:ILRuZ
BITMAPINFOHEADER bih; }pkzH'$HJ
bih.biBitCount=btm.bmBitsPixel; oCz/HQoBk
bih.biClrImportant=0; &tj!*k'
bih.biClrUsed=0; 8$}<, c(
bih.biCompression=0; zTU0HR3A
bih.biHeight=btm.bmHeight; Gk6iIK
bih.biPlanes=1; 6=Otq=WH
bih.biSize=sizeof(BITMAPINFOHEADER); eJ-nKkg~a
bih.biSizeImage=size; 5r^(P
bih.biWidth=btm.bmWidth; SvF<p3
bih.biXPelsPerMeter=0; xJ.M;SF4
bih.biYPelsPerMeter=0; =t?F6)Q
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); 6Z"X}L,*
static int filecount=0; >^3i|PB
CString name; VI*$em O0
name.Format("pict%04d.bmp",filecount++); k!Y, 63V=
name=m_Path+name; CpTjJXb
BITMAPFILEHEADER bfh; vnuN6M{
bfh.bfReserved1=bfh.bfReserved2=0; 3=oDQ&UFt
bfh.bfType=((WORD)('M'<< 8)|'B'); N"ST@/j.A
bfh.bfSize=54+size; c7H^$_^ =
bfh.bfOffBits=54; YGNP53CU
CFile bf; KMax$
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ,I;>aE<#
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); O;3>sLgc
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); pd$[8Rmj_
bf.WriteHuge(lpData,size); "\yT7?},
bf.Close(); 6_B]MN!(
nCount++; VUuE T
} !dq.KwL
GlobalFreePtr(lpData); "#g}ve,
if(nCount==1) )boE/4
m_Number.Format("%d picture captured.",nCount); ~wdGd+ez
else M"L=L5OH-
m_Number.Format("%d pictures captured.",nCount); CTmT@A{
UpdateData(FALSE); 1|:KQl2q
} 0=$T\(0g
rPm x
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) 2~[juWbz
{ +kD
R.E:
if(pMsg -> message == WM_KEYDOWN) o2ECG`^b
{ N2o7%gJw
if(pMsg -> wParam == VK_ESCAPE) C,eu9wOT
return TRUE; %a7$QF]
if(pMsg -> wParam == VK_RETURN) cWm$;`Q#\
return TRUE; B#R|*g:x
} %z$#6?OK^
return CDialog::PreTranslateMessage(pMsg); ~V6D<
} ia?
c0xL
fV~[;e;U.
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) RM/ 0A|
{ Dt1jW
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ : rVnc =k
SaveBmp(); 2`-Bs
return FALSE; ),!qTjD
} !<h)w#>en
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ s#GLJl\E_P
CMenu pop; HVAYPerH
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); {.]7!ISl5
CMenu*pMenu=pop.GetSubMenu(0); 'c~4+o4co
pMenu->SetDefaultItem(ID_EXITICON); 2&5K.Ui%
CPoint pt; Tj- s4x
GetCursorPos(&pt); VtohL+
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); L RF103nw
if(id==ID_EXITICON) !`r$"}g
DeleteIcon(); [-x7_=E#
else if(id==ID_EXIT) V~ _>U}
OnCancel(); 4&iCht
=
return FALSE; yDh6KUK
} -n;}n:wL
LRESULT res= CDialog::WindowProc(message, wParam, lParam); E(|>Ddv B&
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) 2t,zLwBdnJ
AddIcon(); fB,_9K5i
return res; LH6vLuf
} K,UMqAmk
{ xB3S_,8
void CCaptureDlg::AddIcon() fXB0j;A
{ `$NP>%J-
NOTIFYICONDATA data; b`_Q8 J
data.cbSize=sizeof(NOTIFYICONDATA); 048kPXm`
CString tip; Hx:;@_gq
tip.LoadString(IDS_ICONTIP); y+;|Fz
data.hIcon=GetIcon(0); I}Q2Vu<
data.hWnd=GetSafeHwnd(); =R\]=cRbg
strcpy(data.szTip,tip); i mM_H;-X
data.uCallbackMessage=IDM_SHELL; ']oQ]Yx0
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; -$@h1Y
data.uID=98; GKCroyor
Shell_NotifyIcon(NIM_ADD,&data); <-0]i_4sK
ShowWindow(SW_HIDE); P|> ~_$W
bTray=TRUE; ?%kV?eu'
} \Og+c%
E)3NxmM#
void CCaptureDlg::DeleteIcon() mBC+6(5V
{ L rPkxmR
NOTIFYICONDATA data; B1Oq!k
data.cbSize=sizeof(NOTIFYICONDATA); uIrG* K
data.hWnd=GetSafeHwnd(); G/ 5%.Bf@
data.uID=98; C.QO#b
Shell_NotifyIcon(NIM_DELETE,&data); U<-D(J
ShowWindow(SW_SHOW); "ITIhnE
SetForegroundWindow(); 8$|=P!7EO
ShowWindow(SW_SHOWNORMAL); D#z:()VT(
bTray=FALSE; tI{_y
} MY/}-*|
y3ikWnx
void CCaptureDlg::OnChange() A(N4N
{ ]N[ 5q=A5
RegisterHotkey(); BluVmM3Vj
} yppo6HGD
WjjB<YKzF
BOOL CCaptureDlg::RegisterHotkey() kNL\m[W8$
{ iyog`s c
UpdateData(); a}uSm/S
UCHAR mask=0; M@ZI\
UCHAR key=0; #89!'W
if(m_bControl) 4Xv*wB1
mask|=4; b u"!jHPB
if(m_bAlt) abEmRJTmW
mask|=2; lNBL4yM
if(m_bShift) Tb-F]lg$
mask|=1; w`=\5Oa .G
key=Key_Table[m_Key.GetCurSel()]; 7[wieYj{
if(bRegistered){ m#F`] {
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ],v=]+R
bRegistered=FALSE; o8vug$=Z
} cs'{5!i]
cMask=mask; cFWc<55aX6
cKey=key; a@*\o+Su
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); Xs?o{]Fe
return bRegistered; :,I:usW"
} BF <ikilR
4a]P7fx-
四、小结 <"|,"hA
>dG[G>
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。