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:
~qiSkG
S{NfU/:
dL 一、实现方法
p5~;8Q7 swVq%]')" 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:
96Tc:#9i Dc[Qu?]LM #pragma data_seg("shareddata")
mdOF0b%-] HHOOK hHook =NULL; //钩子句柄
'H`_Z e< UINT nHookCount =0; //挂接的程序数目
S`"M;%T static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
eD, 7gC- static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
yoj5XBM static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
r^?%N3 static int KeyCount =0;
>Tld: static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
0=8.8LnN( #pragma data_seg()
F^=|NlU&% 5U[;T]{)e 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。
)(&g\ X!n-nms 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:
h@z(yB
j:0 Qko}rd_M BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
f#l/N%VoBZ cKey,UCHAR cMask)
*4^!e/ {
6!i0ioZzi0 BOOL bAdded=FALSE;
%xR;8IO for(int index=0;index<MAX_KEY;index++){
3Lq?Y7#KQp if(hCallWnd[index]==0){
=ot`V; Q> hCallWnd[index]=hWnd;
[pmZ0/l HotKey[index]=cKey;
P,O9On HotKeyMask[index]=cMask;
KW.S)+<H& bAdded=TRUE;
s&lZxnIjc KeyCount++;
P$@5&/] break;
UG+wRX :dA }
q5[%B K }
d
`Q$URn| return bAdded;
Lvc*L6 }
0=s+bo1 //删除热键
ZBJYpeGe BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
cJm!3X {
eR8qO"%2: BOOL bRemoved=FALSE;
;sa-Bh=j^ for(int index=0;index<MAX_KEY;index++){
1H@GwQ|<= if(hCallWnd[index]==hWnd){
5jg^12EP if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
@)m+O#a hCallWnd[index]=NULL;
F5J=+Q%8[& HotKey[index]=0;
;G~0 VM2| HotKeyMask[index]=0;
9h$-:y3 bRemoved=TRUE;
o"v>
BhpC KeyCount--;
SM:{o&S` break;
D;<Qm,[ }
_qmBPUx }
~]A';xH& }
k-T_,1l{ return bRemoved;
\nx^=4*yk }
Xt8;Pl 1(!!EcU_ Uz H)fB DLL中的钩子函数如下:
gW6lMyiLb KI$?0O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
|zvxKIW;wd {
tGd9Cs9D< BOOL bProcessed=FALSE;
T_, LK7D if(HC_ACTION==nCode)
A
A<9XC {
;oULtQ if((lParam&0xc0000000)==0xc0000000){// 有键松开
ix]3t^ switch(wParam)
@^;WC+\0 {
r[M]2h case VK_MENU:
'8k\a{t_z MaskBits&=~ALTBIT;
(1(3:)@S6 break;
Os8]iNvW\ case VK_CONTROL:
8R:H{)o~s} MaskBits&=~CTRLBIT;
` /]8C&u break;
=X>3C"] case VK_SHIFT:
+&a2aEXF MaskBits&=~SHIFTBIT;
ygUvO3Z break;
0'|#Hi7@ default: //judge the key and send message
*H&a_s/{Nb break;
Y.i<7pBt }
KE16BjX@ for(int index=0;index<MAX_KEY;index++){
; ZL<7tLDb if(hCallWnd[index]==NULL)
=}r&>|rrJ continue;
QKZm<lUL if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
[gzw<b:` {
;myu8B7& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Gr?"okaA bProcessed=TRUE;
C3bZ3vcW$ }
?GD{}f33 }
5HL JkOV5 }
h:# else if((lParam&0xc000ffff)==1){ //有键按下
.rG Rdb switch(wParam)
.K}u`v T {
g=b[V
case VK_MENU:
$|6Le;
K MaskBits|=ALTBIT;
cdP+X'Y4D break;
))G%C6- case VK_CONTROL:
u;&`_=p MaskBits|=CTRLBIT;
4m#i4 break;
<5[wP)K@ case VK_SHIFT:
=[t( [DG MaskBits|=SHIFTBIT;
,`/!0Wmt break;
ui G7 default: //judge the key and send message
Fdu0?H2TL break;
J%f5NSSU{6 }
_ZzPy;[i? for(int index=0;index<MAX_KEY;index++){
m]N4.J if(hCallWnd[index]==NULL)
9qQ_#$Vv continue;
t wtGkkC if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
A0O$B7ylQ {
V[+ Pb] SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
>V87#E bProcessed=TRUE;
-&))$h3o\ }
>S5D-)VX }
YV{^S6M }
p5)A"p8"9, if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
y
@Y@"y for(int index=0;index<MAX_KEY;index++){
0gO2^m)W if(hCallWnd[index]==NULL)
kZ`60X%wE continue;
b
|m$ W if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
8DLR SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
U@m< //lParam的意义可看MSDN中WM_KEYDOWN部分
\~jt7 Q }
v]U[7 j }
YZpF*E;6t }
^;W,:y& return CallNextHookEx( hHook, nCode, wParam, lParam );
e
d4T_O; }
m++VW0Y> 1x M&"p: 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:
_=q)lt-UY }#EiL
!Pv BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
c4L5"_#`x- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
RS<c&{? X-oou'4< 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:
3{d1Jk/S RXl52#: LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
X@af[J[cQ {
4(u+YW GX if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
A{9Hm:) {
|%&WYm6 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
jW2z3.w SaveBmp();
pl
q$t/.U; return FALSE;
VC>KW{&J0 }
dldM hT$ …… //其它处理及默认处理
nm %ka4 }
Rc?wIL) G*ym[ pgU54Ef 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。
O+.V,`O 4d0PW#97. 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。
wGnjuIR 3iH!;`i 二、编程步骤
D9#e2ex] <po(7XB
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";
)]>=Uo ]Z<{
~ 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
s'~_pP 2c8,H29 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;
z%+?\.oH lOd[8|/ 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;
{l *ps-fi ^>g+:?x 5、 添加代码,编译运行程序。
y<)Lr}gP JkQ4'$: 三、程序代码
! ~&X1,l1* gA~Ih ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
oPzt1Y #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
fcJ#\-+E #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
`'Z ;+h] #if _MSC_VER > 1000
Qkr'C
n #pragma once
rU.ew~ #endif // _MSC_VER > 1000
zFB$^)v"< #ifndef __AFXWIN_H__
z<^HohT #error include 'stdafx.h' before including this file for PCH
tBrd+}e2* #endif
js8uvZ i #include "resource.h" // main symbols
68 - I2@& class CHookApp : public CWinApp
hbE;zY%hP {
xOTm-Cm9L public:
ih ,8'D4 CHookApp();
mjBXa // Overrides
u@|GQXC // ClassWizard generated virtual function overrides
m&2<?a}l //{{AFX_VIRTUAL(CHookApp)
Sw'DS public:
$`l- cSH; virtual BOOL InitInstance();
Q$kSK+ q! virtual int ExitInstance();
,"j|0Q //}}AFX_VIRTUAL
.O1g'% //{{AFX_MSG(CHookApp)
8{Zgvqbb // NOTE - the ClassWizard will add and remove member functions here.
Q*mPU=< // DO NOT EDIT what you see in these blocks of generated code !
[R
A=M //}}AFX_MSG
!i)?j@D DECLARE_MESSAGE_MAP()
%0:
('' };
4~G9._ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
Z"e|DP` BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
>-y'N.l^ BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
I!# 42~\ BOOL InitHotkey();
Gt6$@ji4u BOOL UnInit();
V-7!)&q #endif
<FGNV+?%e +Icg;m{ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
^BNg^V. #include "stdafx.h"
.f(x9|K^ #include "hook.h"
]MUuz'< #include <windowsx.h>
Eg
w ? #ifdef _DEBUG
3ufUB^@4v #define new DEBUG_NEW
$qIMYX #undef THIS_FILE
evimnV static char THIS_FILE[] = __FILE__;
!Otyu6& #endif
#[I`VA\x #define MAX_KEY 100
n/^wzG #define CTRLBIT 0x04
-I4@` V #define ALTBIT 0x02
@BW~A@8 #define SHIFTBIT 0x01
42#
rhgW #pragma data_seg("shareddata")
!30Dice HHOOK hHook =NULL;
uiDR} UINT nHookCount =0;
47
m:z5; static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
Dyt}"r\ static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
D}\%
Q # static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
5^f>L2 static int KeyCount =0;
#{ `(;83 static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
Nv #vfh9}P #pragma data_seg()
EVRg/{X HINSTANCE hins;
kCN9`9XI{ void VerifyWindow();
\!G&:<h BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
@Cw<wrem //{{AFX_MSG_MAP(CHookApp)
,pf<"^li // NOTE - the ClassWizard will add and remove mapping macros here.
&:'Uh
W-t // DO NOT EDIT what you see in these blocks of generated code!
\J9@p //}}AFX_MSG_MAP
oEKLuy END_MESSAGE_MAP()
sbkWJy &*MwKr<y CHookApp::CHookApp()
a#j0N5<Nl {
#p=/P{* // TODO: add construction code here,
%Vive2j C // Place all significant initialization in InitInstance
%3z-^#B= }
zy+|)^E 4HkOg)a CHookApp theApp;
f&{2G2O% LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
t55
' {
j6IWdqXe BOOL bProcessed=FALSE;
Et`z7Q*e if(HC_ACTION==nCode)
}@a_x,O/x} {
#.FtPR if((lParam&0xc0000000)==0xc0000000){// Key up
f4`=yj* switch(wParam)
uN6TV*]: {
Wl::tgU case VK_MENU:
P) GBuW MaskBits&=~ALTBIT;
\t^q@}~0Wz break;
]hv4EL(zi case VK_CONTROL:
`){*JPl MaskBits&=~CTRLBIT;
mv<z%y?Oj break;
gt'0B-;W case VK_SHIFT:
i(L;1 ` MaskBits&=~SHIFTBIT;
I&R4.;LW break;
ha3 Qx default: //judge the key and send message
kF6X?mqgD break;
GaM#a[p }
p# O%<S@? for(int index=0;index<MAX_KEY;index++){
H4^-M Sw if(hCallWnd[index]==NULL)
X^fMt] continue;
}MXZ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yv4hH4Io {
ldi'@^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
y=5s~7] bProcessed=TRUE;
x1Z?x,-D" }
wdl6dLu }
7P=1+2V }
2-]gHAw% else if((lParam&0xc000ffff)==1){ //Key down
8cR4@Hqx switch(wParam)
^Zydy {
V0ulIKck case VK_MENU:
]rC6fNhQ MaskBits|=ALTBIT;
q9icj break;
'$q'Wl) case VK_CONTROL:
jo{GPp} MaskBits|=CTRLBIT;
RK"dPr break;
(#LV*&K%IC case VK_SHIFT:
2$=?;~ MaskBits|=SHIFTBIT;
}T4"#'` break;
4vp,izNW default: //judge the key and send message
p24sWDf break;
1th|n }
>Y)jt*vQ for(int index=0;index<MAX_KEY;index++)
FU5vo {
|UBR8 if(hCallWnd[index]==NULL)
!-LPFy> continue;
q
( H^H if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
IWuR=I$t {
VU}UK$JN SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
+Rxf~m(pV bProcessed=TRUE;
m:II<tv }
5JIa?i>B }
pbR84g^p.S }
$PHKI B( if(!bProcessed){
Y@_ i32,r for(int index=0;index<MAX_KEY;index++){
4\dc if(hCallWnd[index]==NULL)
K(Zd-U continue;
8O("o7~" if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
HQ ^> ~ SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
}4
P@`>e/` }
IEjKI" }
n=L;(jp<j }
+cQ4u4 return CallNextHookEx( hHook, nCode, wParam, lParam );
u5$\E]+_ }
q8P| ] =ni&*& BOOL InitHotkey()
>umcpkp-h {
)Xl/|YD if(hHook!=NULL){
-Ufd+( nHookCount++;
t 0nGZ%` return TRUE;
L8/o9N1 }
9I+;waLlB else
-:*PXu hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
r >u0Y if(hHook!=NULL)
P_,f nHookCount++;
) ?+-Z2BwA return (hHook!=NULL);
OT{qb!eYI }
#@3RYx BOOL UnInit()
Pm#B'N#*N| {
W>bhSKV% if(nHookCount>1){
!+JSg uy nHookCount--;
#O\4XZ,Lv return TRUE;
DIkD6n?V }
91jv=>=DM BOOL unhooked = UnhookWindowsHookEx(hHook);
P/,7CfyPd if(unhooked==TRUE){
;BejFcb nHookCount=0;
VKS:d!}3E hHook=NULL;
DU({Ncge }
? R;5ErZ return unhooked;
#Z98D9Pv`o }
DUM,dFIlvF >.\G/'\? BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
>p}d:t/ {
o8H<{D13 BOOL bAdded=FALSE;
O]4!U#A for(int index=0;index<MAX_KEY;index++){
9IN=m 5 if(hCallWnd[index]==0){
^qy$M> hCallWnd[index]=hWnd;
M!;H3* HotKey[index]=cKey;
2RT9Q!BX{ HotKeyMask[index]=cMask;
It(8s)5 bAdded=TRUE;
)PB&w%J KeyCount++;
{KdC51"Nv break;
4/~8zvz&3 }
LV4x9?& }
rm1R^n return bAdded;
-Z4J?b }
L7wl3zG 4(bV# BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
v}+axu/? {
}sd-X`lZ BOOL bRemoved=FALSE;
j K$4G.x for(int index=0;index<MAX_KEY;index++){
Y^2`)': if(hCallWnd[index]==hWnd){
J,4]du$ if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
43A6B hCallWnd[index]=NULL;
V`pTl3 HotKey[index]=0;
;]i&AAbj HotKeyMask[index]=0;
&!N5}N& bRemoved=TRUE;
jF Bq> KeyCount--;
gupB8 .! break;
*jTr }
+r2E5s }
LCyci1\@ }
23_<u]V return bRemoved;
one^XYy1% }
5l=B,%s fh b &_T void VerifyWindow()
U^+9l?ol {
GH7{_@pv8 for(int i=0;i<MAX_KEY;i++){
Ke&lGf"5 if(hCallWnd
!=NULL){ 6mep|![6
if(!IsWindow(hCallWnd)){ >tr_Ypfv,c
hCallWnd=NULL; ;}A#ws_CD_
HotKey=0; N>/*)Frt
HotKeyMask=0; >m:.5][yu
KeyCount--; _-%ay
} "f!*%SR:
1
} $a15
8
} Jtd@8fVi
} 9(ZzwkD'>
$-=aqUU
BOOL CHookApp::InitInstance() S82NU2L
{ ]WWre},
AFX_MANAGE_STATE(AfxGetStaticModuleState()); ,RCjfXa
hins=AfxGetInstanceHandle(); cuq7eMG6z
InitHotkey(); +(/XMx}a
return CWinApp::InitInstance(); /v5Pk.!o
} thipfS
t<ftEJU"'w
int CHookApp::ExitInstance() xXA$16kd
{ ~1|sf8
VerifyWindow(); [O"i!AQ
UnInit(); g_0"T}09(
return CWinApp::ExitInstance(); {)4Vv`n
} puZ<cV
e/
"'t<R}t!A
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file ;cp-jY_U
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) n 8AND0a1C
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ 2*K0~ b`
#if _MSC_VER > 1000 0qG[hxt%
#pragma once ^>%=/RX
#endif // _MSC_VER > 1000 KS*W<_I
*n}9_V%
class CCaptureDlg : public CDialog ?aOR ^ K
{ +
{a
// Construction 45kMIh~~X
public: R3?~+y&
BOOL bTray; :&?# ~NFH
BOOL bRegistered; D1o 8Wo
BOOL RegisterHotkey(); ?z:xQ*#X
UCHAR cKey; k\ I$ve"*
UCHAR cMask; "MoV*U2s,
void DeleteIcon(); ry~3YYEMI0
void AddIcon(); M#<x2ojW
UINT nCount; Z"Et]xSU%$
void SaveBmp(); Sw5H+!
CCaptureDlg(CWnd* pParent = NULL); // standard constructor lz{>c.Ll[
// Dialog Data ei\X/Z*q%P
//{{AFX_DATA(CCaptureDlg) Ql&P1|&
enum { IDD = IDD_CAPTURE_DIALOG }; OQ+?nB
CComboBox m_Key; 2i,Jnv=sR
BOOL m_bControl; 'kH#QO\(e"
BOOL m_bAlt; =;Wkg4\5
BOOL m_bShift; }-r"W7]k
CString m_Path; D|e 6$O5o
CString m_Number; 6b<t|zb
//}}AFX_DATA AQQj]7Y
// ClassWizard generated virtual function overrides &cpRB&bf
//{{AFX_VIRTUAL(CCaptureDlg) sv0kksj
public: `Z%XA>
virtual BOOL PreTranslateMessage(MSG* pMsg); *2:)Rf
protected: 5VG@Q%
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support B@iIj<p~
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); #y>oCB`EM
//}}AFX_VIRTUAL l\$C)q6O
// Implementation 8$G$Rdn
protected: i3e|j(Gs4
HICON m_hIcon; *,'"\n
// Generated message map functions B5I(ai7<M
//{{AFX_MSG(CCaptureDlg) ;H:qDBH
virtual BOOL OnInitDialog(); L {B#x@9tQ
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); 0HNe44oI+D
afx_msg void OnPaint(); fcw\`.
afx_msg HCURSOR OnQueryDragIcon(); A=XM(2{aN
virtual void OnCancel(); ?[m5|ty#
afx_msg void OnAbout(); Llk`
afx_msg void OnBrowse(); HnY: gu
afx_msg void OnChange(); 3_33@MM
//}}AFX_MSG X,y$!2QI
DECLARE_MESSAGE_MAP() ?nt6vqaV
}; $mlsFBd
#endif X='4N<
2ZE4^j|
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file .Bi7~*N
#include "stdafx.h" l
#include "Capture.h" ;nh7Elk
#include "CaptureDlg.h" IL>g-
#include <windowsx.h> Wq,UxMz
#pragma comment(lib,"hook.lib") 0hNc#x6
#ifdef _DEBUG .Dx]wv
#define new DEBUG_NEW ||!k 3t#<
#undef THIS_FILE ^8MgNVoJ)
static char THIS_FILE[] = __FILE__; )%MBo.NL
#endif rcyH2)Y/e
#define IDM_SHELL WM_USER+1 _@^msyoq
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); jXW71$B
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); SR 43#!99Q
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; *S=v1 s/
class CAboutDlg : public CDialog }'@*Ol j
{ ~?L. n:wu
public: i,)kI
CAboutDlg(); F'*{Fk
h
// Dialog Data ;c;;cJc!
//{{AFX_DATA(CAboutDlg) ]]7s9PCN
enum { IDD = IDD_ABOUTBOX }; CX1'B0=\r
//}}AFX_DATA 'E7|L@X"r
// ClassWizard generated virtual function overrides |20p#]0E+
//{{AFX_VIRTUAL(CAboutDlg) LXK+WB/s
protected: Sk1yend4
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support |UlScUI,
//}}AFX_VIRTUAL E4{^[=}
// Implementation W0nRUAo[
protected: ?VzST }
//{{AFX_MSG(CAboutDlg) Ur@'X-
//}}AFX_MSG FD`V39##
DECLARE_MESSAGE_MAP() IzL
yn
}; TnKe"TA|9
3F4I{L
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) GQ[\R&]q<
{ /#Xz+#SqY
//{{AFX_DATA_INIT(CAboutDlg) 9wI1/>
//}}AFX_DATA_INIT Z+vLEEX*uQ
} 4)"jg[
N*$Q(K
void CAboutDlg::DoDataExchange(CDataExchange* pDX) e{?~m6
{ 5q8bM.k\7N
CDialog::DoDataExchange(pDX); BGA.8qWR4
//{{AFX_DATA_MAP(CAboutDlg) )P,jpE8
//}}AFX_DATA_MAP )D#*Q~
} YL{LdM-xM
:|fzGf
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) QzV:^!0J
//{{AFX_MSG_MAP(CAboutDlg)
_y8)jD"
// No message handlers 7pGlbdS
//}}AFX_MSG_MAP 0&w.QoZY(
END_MESSAGE_MAP() :ox+WY
aIm\tPbb
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) $MP'j9-S?
: CDialog(CCaptureDlg::IDD, pParent) 3N<FG.6
{ &1VC0"YJWy
//{{AFX_DATA_INIT(CCaptureDlg) >Vg<J~[g
m_bControl = FALSE; N2x\O~7
m_bAlt = FALSE; -ff*,b$Q/
m_bShift = FALSE; #PFf`7b,z
m_Path = _T("c:\\"); U`:$1*(`
m_Number = _T("0 picture captured."); \6sp"KqP
nCount=0; eR;cl$
bRegistered=FALSE; RE*SdazY?
bTray=FALSE; #^eviF8
//}}AFX_DATA_INIT 8WaVs 6
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 7[8PSoo
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); J.*dA j
} jT'1k[vJj
hDfsqSK0 /
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) cQN}z
Ke
{ ;up89a-,9
CDialog::DoDataExchange(pDX); @y}1%{,%
//{{AFX_DATA_MAP(CCaptureDlg) h"q`gj
DDX_Control(pDX, IDC_KEY, m_Key); ymzlRs1^Ct
DDX_Check(pDX, IDC_CONTROL, m_bControl); N.3M~0M*
DDX_Check(pDX, IDC_ALT, m_bAlt); }9@,EEhg
DDX_Check(pDX, IDC_SHIFT, m_bShift); }t]CDa_n
DDX_Text(pDX, IDC_PATH, m_Path); oU{m\r
DDX_Text(pDX, IDC_NUMBER, m_Number); 2AU_<Hr6
//}}AFX_DATA_MAP ^S[Mg6J
} PiM@iS
r0hu?3u1?
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) xy[R9_V
//{{AFX_MSG_MAP(CCaptureDlg) #,$d!l @
ON_WM_SYSCOMMAND() jtN2%w;
ON_WM_PAINT() RELLQpz3
ON_WM_QUERYDRAGICON() +e4o~p
ON_BN_CLICKED(ID_ABOUT, OnAbout) 7zy6`OP
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) L%N|8P[
ON_BN_CLICKED(ID_CHANGE, OnChange) \/'u(|G
//}}AFX_MSG_MAP *R8q)Q
END_MESSAGE_MAP() qM]eK\q 1
up`!r;5-
BOOL CCaptureDlg::OnInitDialog() {6A3?q
{ &s\w:
9In
CDialog::OnInitDialog(); :3u>%
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); Eiwo==M
ASSERT(IDM_ABOUTBOX < 0xF000); #=+d;RdlW
CMenu* pSysMenu = GetSystemMenu(FALSE); XG*Luc-v
if (pSysMenu != NULL) 6x6PP}IX
{ `&j5/[>v
CString strAboutMenu; ?!8M
I,c/
strAboutMenu.LoadString(IDS_ABOUTBOX); r1xNU0A
if (!strAboutMenu.IsEmpty()) V[Auw3)
{ NtSa#$A
pSysMenu->AppendMenu(MF_SEPARATOR); )CEfG
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ~x`OCii
} vMDV%E S1t
} <+pwGKtD
SetIcon(m_hIcon, TRUE); // Set big icon l *.#g
SetIcon(m_hIcon, FALSE); // Set small icon gHA"O@HgDI
m_Key.SetCurSel(0);
"ifYy>d
RegisterHotkey(); d\D.l^
CMenu* pMenu=GetSystemMenu(FALSE); 05.^MU?^U
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); -+ -@Yq$
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Hj$JXo[U
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ]xfu@''
return TRUE; // return TRUE unless you set the focus to a control @9-z8PyF
} [C9 ->`(`
h /@G[5E
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) zT*EpIa+LS
{ vc5g4ud
if ((nID & 0xFFF0) == IDM_ABOUTBOX) :WJ[a#
{ STL&ZO
CAboutDlg dlgAbout; O2-9Oo@#,
dlgAbout.DoModal(); G!uoKiL
} 6ix8P;;}#
else fOtL6/?
{ 8:|F'{<<b
CDialog::OnSysCommand(nID, lParam); AK} wSXF
} I!|_C~I` 2
} ?ep93:j
V^As@P8,'(
void CCaptureDlg::OnPaint() 5O%Q*\(
{ NDWpV
if (IsIconic()) v&;q4b4
{ :]v%6i.
CPaintDC dc(this); // device context for painting sjvlnnO
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); NVAt-u0LB
// Center icon in client rectangle -O:+?gG
int cxIcon = GetSystemMetrics(SM_CXICON); P=OHiG\z
int cyIcon = GetSystemMetrics(SM_CYICON); DKx8<yEky
CRect rect; L
Me{5H
GetClientRect(&rect); z}&?^YU*)`
int x = (rect.Width() - cxIcon + 1) / 2; L#1YR}m
int y = (rect.Height() - cyIcon + 1) / 2; wKIQK!B)mF
// Draw the icon =c"`>Vi@d
dc.DrawIcon(x, y, m_hIcon); -1;BwlL
} !X[b 4p
else 6*J`2U9Q
{ ?|s1Cuc
CDialog::OnPaint(); B\G?dmo
} }_vE
lBh6$
} BxS\"W
]Nz~4ebB
HCURSOR CCaptureDlg::OnQueryDragIcon() *$1M=$
{ u^8:/~8K
return (HCURSOR) m_hIcon; Y!N*J
} M{<cqxY
BqC!78Y/e
void CCaptureDlg::OnCancel() y0k*iS
e
{ )7l+\t
if(bTray) nlOM4fJ(
DeleteIcon(); sKVN*8ia
CDialog::OnCancel(); $!)Sgb
} xDD3Y{K
t;!vjac
void CCaptureDlg::OnAbout() hy3j8?66
{ ;}"_hLX
CAboutDlg dlg; (A|Gb2 X
dlg.DoModal();
) jv]Oz
} TPH`{
ViIt'WX
void CCaptureDlg::OnBrowse() $hZb<Xz
{ rJ|Q%utYz
CString str; DN3#W w2[r
BROWSEINFO bi; BQu_)@
char name[MAX_PATH]; kclClB:PS
ZeroMemory(&bi,sizeof(BROWSEINFO)); #; CC"
bi.hwndOwner=GetSafeHwnd(); >>oR@
bi.pszDisplayName=name; FR&4i" +
bi.lpszTitle="Select folder"; YNyaz\L
bi.ulFlags=BIF_RETURNONLYFSDIRS; MB06=N
LPITEMIDLIST idl=SHBrowseForFolder(&bi); ?f<JwF<
if(idl==NULL) nk|j(D
return; /n;Ll](ri
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); :34]}`-
str.ReleaseBuffer(); `?r]OVe{y
m_Path=str; S{'/=Px+
if(str.GetAt(str.GetLength()-1)!='\\') ErIAS6HS'
m_Path+="\\"; |h$*z9bsf
UpdateData(FALSE); KE! aa&g
} `@1y|j:m
lO3W:,3_a
void CCaptureDlg::SaveBmp() dfl| 6R
{ S<HR6Xw
CDC dc; o=@0Bd8
dc.CreateDC("DISPLAY",NULL,NULL,NULL); d$Y3 a^O|
CBitmap bm; +y'V
int Width=GetSystemMetrics(SM_CXSCREEN); ^PA >t$
int Height=GetSystemMetrics(SM_CYSCREEN); x(pq!+~K
bm.CreateCompatibleBitmap(&dc,Width,Height); |U)m'W-(q
CDC tdc; G347&F)
tdc.CreateCompatibleDC(&dc); =
}0M^F
CBitmap*pOld=tdc.SelectObject(&bm); {5w'.Z]0v
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); (WZKqt)S"o
tdc.SelectObject(pOld); A[)od
BITMAP btm; RP 'VEJ
bm.GetBitmap(&btm); :ZG^`H/X1d
DWORD size=btm.bmWidthBytes*btm.bmHeight; 7ADh
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); e&%m[:W:<
BITMAPINFOHEADER bih; |TM&:4D]^
bih.biBitCount=btm.bmBitsPixel; |<tZ|
bih.biClrImportant=0; XN65bq
bih.biClrUsed=0; b Lag&c)
bih.biCompression=0; ~_<I}!j/B
bih.biHeight=btm.bmHeight; $.{CA-~%[
bih.biPlanes=1; KzD5>Xf]4$
bih.biSize=sizeof(BITMAPINFOHEADER); ;sJUTp5\h
bih.biSizeImage=size; 7yp7`|,p
bih.biWidth=btm.bmWidth; WvSh i=
bih.biXPelsPerMeter=0; >`L)E,=/
bih.biYPelsPerMeter=0; ,Fo7E
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); C/V{&/5w
static int filecount=0; =Lx*TbsFYt
CString name; ]+A>*0#"
name.Format("pict%04d.bmp",filecount++); /xf4*zr
name=m_Path+name; :a$ZYyD
BITMAPFILEHEADER bfh; /!J1}S
bfh.bfReserved1=bfh.bfReserved2=0; tKg\qbY&
bfh.bfType=((WORD)('M'<< 8)|'B'); b*$/(2"m
bfh.bfSize=54+size; ~3-2Iu^F
bfh.bfOffBits=54; 6!P];3&o\A
CFile bf; NCbl|v=
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ )#ze
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); 3S='/^l
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Vfew )]I
bf.WriteHuge(lpData,size); @gzm4
bf.Close(); 3l5rUjRwj
nCount++; kB_u U !G
} ]=ar&1}J
GlobalFreePtr(lpData); $[9,1.?C
if(nCount==1) c*MSd
m_Number.Format("%d picture captured.",nCount); dv3+x\`9
else [ox!MQ+s
m_Number.Format("%d pictures captured.",nCount); r"#h6lYK&
UpdateData(FALSE); 5<Mht6"H
} _\yrR.HIa
h
$)thW
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) w6tb vhcmU
{ jRIjFn|~{Y
if(pMsg -> message == WM_KEYDOWN) . 2_t/2
{ 1o)Vzv
if(pMsg -> wParam == VK_ESCAPE) SR>Sq2cW0
return TRUE; 47I5Y5
if(pMsg -> wParam == VK_RETURN) mtDRF'>P:
return TRUE; e
iS~*@
} x" 21 Jh
return CDialog::PreTranslateMessage(pMsg); ~/?JRL=
} ~:7AHK2
PRmZ3
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =uKGh`^[
{ AMqu}G
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ : sIZ+3
SaveBmp(); G#V5E)Dx
return FALSE; w`XwW#!}@$
} cyUNJw
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ ( 8+ _~_
CMenu pop; 1lRqjnzve&
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 6S?a57;&W
CMenu*pMenu=pop.GetSubMenu(0); ^Q8m)0DP
pMenu->SetDefaultItem(ID_EXITICON); n=v4m_e
CPoint pt; E\!:MCL
GetCursorPos(&pt); %8iA0t+
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); y$@d%U*rW^
if(id==ID_EXITICON) qmUq9bV
DeleteIcon(); 9_IR%bm
else if(id==ID_EXIT) $IUP;
OnCancel(); I0ycLx
return FALSE; wP3PI.g-g
} @~6A9Fr
LRESULT res= CDialog::WindowProc(message, wParam, lParam); =QEg~sD^)s
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) rC] jz$sle
AddIcon(); ]*a)'k_@[
return res; J{72%S
} .K^'Q|?
@ [_I|
void CCaptureDlg::AddIcon() ]7kq@o/7
{ ;cZ9C 1
NOTIFYICONDATA data; #r 1
$=GY
data.cbSize=sizeof(NOTIFYICONDATA); z79L2lJn
CString tip;
Z4'"*
tip.LoadString(IDS_ICONTIP); uE:#m.Q
data.hIcon=GetIcon(0); R= HN>(U
data.hWnd=GetSafeHwnd(); S|T:rc(~
strcpy(data.szTip,tip); [;dWFG"f
data.uCallbackMessage=IDM_SHELL; UNocm0!N'
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @%J?[PG
data.uID=98; G\h8j*o
Shell_NotifyIcon(NIM_ADD,&data); )>at]mH
ShowWindow(SW_HIDE); BXueOvO8
bTray=TRUE; A`u04Lm7
} v}dt**l
THQW8 V
void CCaptureDlg::DeleteIcon() oMda)5 &
{ yAEOn/.~
NOTIFYICONDATA data; g=; rM8W
data.cbSize=sizeof(NOTIFYICONDATA); j-$aa;
data.hWnd=GetSafeHwnd(); HCQv"i}-
data.uID=98; Rf2/[
Shell_NotifyIcon(NIM_DELETE,&data); <Xw 6m$fr:
ShowWindow(SW_SHOW); ;}K1c+m!5V
SetForegroundWindow(); aq"E@fb
ShowWindow(SW_SHOWNORMAL); rBs7,h
bTray=FALSE; y5?T`ts,#
} GSV,
#Q6wv/"Ub
void CCaptureDlg::OnChange() S6}_Z
{ S}e*~^1J
RegisterHotkey(); Wf_aEW&n
} /6F 1=O(c>
@FkNT~OZ
BOOL CCaptureDlg::RegisterHotkey() If6wkY6sR
{ P>euUVMPz4
UpdateData(); 9In&vF7$
UCHAR mask=0; .^#{rk
UCHAR key=0; 'N=' B<^;%
if(m_bControl) eFXxkWR)
mask|=4; -a3+C,I8g
if(m_bAlt) fh$U"
mask|=2; /@FB;`'
if(m_bShift) 5`oor86
mask|=1; W_8FzXA
key=Key_Table[m_Key.GetCurSel()]; =YA%=
d_
if(bRegistered){ 'DsfKR^s
DeleteHotkey(GetSafeHwnd(),cKey,cMask); &0f7>.y
bRegistered=FALSE; EBzg<-?o
} @babgP,
cMask=mask; K *vNv4
cKey=key; /Re1QS
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); UkNC|#l)
return bRegistered; H#U{i
} i40r}?-
&:]_a?|*S
四、小结 o)}b Fw
4)2*|w
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。