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:
94qHY1rp
)CwMR'LV 一、实现方法
r2E>sHw *uI hxMX 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:
K-"HcHuF 3zA8pI w #pragma data_seg("shareddata")
V<~_OF HHOOK hHook =NULL; //钩子句柄
B>p0FQ. UINT nHookCount =0; //挂接的程序数目
^H\-3/si* static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
aowPji$H static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
W[1f]w3 static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
Pt PGi^ static int KeyCount =0;
Dj,+t+| static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
8Y{}p[UFT #pragma data_seg()
0bnVIG2q C%95~\Ds 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。
+}`O^#<qLX <QkN}+B= 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:
V~]'+A
q> n&3iv^ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Gw\G+T?M- cKey,UCHAR cMask)
'sjJSc {
=7J|KoKK BOOL bAdded=FALSE;
f@F^W YQm for(int index=0;index<MAX_KEY;index++){
)bIK0h if(hCallWnd[index]==0){
5uD#=/oV hCallWnd[index]=hWnd;
l_YdIUl HotKey[index]=cKey;
?*z(1!
HotKeyMask[index]=cMask;
02J6Pn3 bAdded=TRUE;
.J1Hg KeyCount++;
0ez
i?Um break;
aoakTi!} }
#8Id:56 }
z!1/_]WJ, return bAdded;
E-tNB{r@ }
+Qi52OG //删除热键
@8Q+=abz BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
.
tH35/r {
k`2B9,z BOOL bRemoved=FALSE;
yZ?_q$4kEI for(int index=0;index<MAX_KEY;index++){
k^dCX+ if(hCallWnd[index]==hWnd){
?{.b9` if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
8x^H<y=O hCallWnd[index]=NULL;
mtWx ?x HotKey[index]=0;
v_@#hf3 HotKeyMask[index]=0;
3 R:7bex bRemoved=TRUE;
Qq FfR# KeyCount--;
xV n]m9i break;
Cs1%g }
Nz>E#.++ }
iM\ZJ6 }
Y9H *S*n return bRemoved;
ev;5?9\E }
"- j@GCme I3zitI; Pdo5sve DLL中的钩子函数如下:
lc$@Jjg9 uZ2v;]\Y6 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
s=y9!rr {
Eip~~2 BOOL bProcessed=FALSE;
sNk>0 X[ if(HC_ACTION==nCode)
eFXi )tl {
HDW\S# if((lParam&0xc0000000)==0xc0000000){// 有键松开
1z};"A switch(wParam)
WJFTy+bD {
qq9tBCk case VK_MENU:
RP@idz MaskBits&=~ALTBIT;
t1RwB23 break;
8#Z\ }gGz case VK_CONTROL:
%dk$K!5D0 MaskBits&=~CTRLBIT;
"za*$DU break;
k0e|8g X case VK_SHIFT:
#Mem2cz MaskBits&=~SHIFTBIT;
XUqE5[O% break;
s<r.+zqW default: //judge the key and send message
_ KkVI7a break;
x4m_(CtK }
:J4C'N for(int index=0;index<MAX_KEY;index++){
)r|zi
Z {F if(hCallWnd[index]==NULL)
#:\+7mCF continue;
J*lYH]s if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
MTITIecw= {
Mi/'4~0Y SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
GLKN<2|2@y bProcessed=TRUE;
D16;6K'{ }
e~
78'UH }
n%ArA])_& }
!{~7 )iq else if((lParam&0xc000ffff)==1){ //有键按下
l& ^B switch(wParam)
@n;YF5 {
1d@^,7MF- case VK_MENU:
J>|:T MaskBits|=ALTBIT;
f?<M3P break;
$E~Lu$| case VK_CONTROL:
CL}I:/zRB MaskBits|=CTRLBIT;
n$![b_)* break;
DwrCysIK case VK_SHIFT:
'm!11Phe MaskBits|=SHIFTBIT;
x]J-q5 break;
&\]f!'jV default: //judge the key and send message
\=G
Xe.}4d break;
~z1KD)^ }
wsGq>F~ for(int index=0;index<MAX_KEY;index++){
NMY!-Kv 5 if(hCallWnd[index]==NULL)
&qI5*aQ8T continue;
o Jp_c if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
.HyiPx3^ {
K~ /V SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
xo_k"'f+ bProcessed=TRUE;
+U/ "F|M }
Lp]C![\>U }
(uK), *6B }
>93{=+ if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
4!s k3Cw{ for(int index=0;index<MAX_KEY;index++){
e"H+sM26- if(hCallWnd[index]==NULL)
{)[g continue;
Umwg
iw if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
; o@`l$O SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
H=BR
- //lParam的意义可看MSDN中WM_KEYDOWN部分
j83Y'VJJC }
=$zr
t }
A`/7>'k/q[ }
BMj&*p8R return CallNextHookEx( hHook, nCode, wParam, lParam );
]<_!@J6k }
%C][E^9 >]|^Ux,WZ 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:
dvWlx]' __n"DLW BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
n|,Vm@zV BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
MGC0^voe -bu. *= 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:
[3NV # zr9Pm6Rl LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
&E'>+6 {
RkV3_c if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
Sm_:SF!<D6 {
^A<.s_ //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
h=y(2xA SaveBmp();
:Du{8rV return FALSE;
u]-El}*[ }
K~%5iVO~\ …… //其它处理及默认处理
G}xBYc0b }
xs`gN %|* y/m #YVDOR{z 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。
1;[
<||K '0M0F'R 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。
juYt = 61wG: 二、编程步骤
128 rly m/B9)JzY 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";
GeTCN +hhbp'% 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
I%*Zj,> IX3yNTW"L 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;
um;U;%?Q pG=zGx4 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;
s"F,=]HQ!G oqo8{hrdHk 5、 添加代码,编译运行程序。
Yy~ Dg G%/cV?18 三、程序代码
Y k6WSurw RXvcy< ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
H$iMP.AK #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
\/%Q PE8 #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
WW@"75t #if _MSC_VER > 1000
N5]68Fu'({ #pragma once
8(K~QvE~ #endif // _MSC_VER > 1000
<sG> [\i #ifndef __AFXWIN_H__
*4\ub:9 #error include 'stdafx.h' before including this file for PCH
#!j&L6 #endif
sJYX[ #include "resource.h" // main symbols
yf>,oNIAg class CHookApp : public CWinApp
1@@]h!>k: {
~;a* Oxt public:
)p](*Z^ CHookApp();
GDe$p;#"9g // Overrides
>%A=b}VS // ClassWizard generated virtual function overrides
Y{{,62D //{{AFX_VIRTUAL(CHookApp)
l%w|f`B: public:
B|w}z1. virtual BOOL InitInstance();
$jL.TraV7 virtual int ExitInstance();
uty]-k //}}AFX_VIRTUAL
L)"w-,zy //{{AFX_MSG(CHookApp)
[vJosbU; // NOTE - the ClassWizard will add and remove member functions here.
_\]UA?0 // DO NOT EDIT what you see in these blocks of generated code !
cl8Mv //}}AFX_MSG
~t$VzL1 DECLARE_MESSAGE_MAP()
JsdEA };
../(gG9 LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
|'(IWU BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
h 'CLf] BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
SK2pOZN BOOL InitHotkey();
v3]M;Y\ BOOL UnInit();
N#qoKY(# #endif
wOSNlbQ5jl O3^@" IY //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
O$ \N]# #include "stdafx.h"
L(YT6Vmm+t #include "hook.h"
!2,.C+, #include <windowsx.h>
MQI= #ifdef _DEBUG
VAz+J #define new DEBUG_NEW
E$baQU hKS #undef THIS_FILE
uu #+|ZD static char THIS_FILE[] = __FILE__;
o
W [-? #endif
RR9s%>^ #define MAX_KEY 100
oOvbel`; #define CTRLBIT 0x04
\8H"lcj: #define ALTBIT 0x02
oOw"k*,h:S #define SHIFTBIT 0x01
^`9OA`2 #pragma data_seg("shareddata")
g M.(BN HHOOK hHook =NULL;
iE{ SqX UINT nHookCount =0;
eLWzd_ln static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
![Y$[l static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
ijT^gsLL static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
?/ g(Y static int KeyCount =0;
R2gax; static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
m{" zFD/ #pragma data_seg()
fe,CY5B{ HINSTANCE hins;
x6]?}Q>>D void VerifyWindow();
!ym5'h BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
ng\S%nA&J //{{AFX_MSG_MAP(CHookApp)
U$%w"k7^( // NOTE - the ClassWizard will add and remove mapping macros here.
B.b)YE ' // DO NOT EDIT what you see in these blocks of generated code!
3x$ #L!VuU //}}AFX_MSG_MAP
x-EAu3=V END_MESSAGE_MAP()
xr -scdh2 "^7Uk#!
7 CHookApp::CHookApp()
qz):YHxT]n {
b ;b1V // TODO: add construction code here,
/_HL&|N_5 // Place all significant initialization in InitInstance
F.6SX (x }
Z7/lFS'~N ('Pd
GV4V CHookApp theApp;
bEJZh%j! LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
}s9J+m {
7eyh9E!_I BOOL bProcessed=FALSE;
GQQ6 t if(HC_ACTION==nCode)
/vU31_eZt {
A1@a:P= if((lParam&0xc0000000)==0xc0000000){// Key up
C .Yz<?;S switch(wParam)
0
$r{h}[^c {
5VS<I\o} case VK_MENU:
R8]bi|e) MaskBits&=~ALTBIT;
xC]/i(+bA break;
aeIR}'H| case VK_CONTROL:
x3
<Lx^; MaskBits&=~CTRLBIT;
G#>nOB break;
ME"/%59r case VK_SHIFT:
F ry5v?22 MaskBits&=~SHIFTBIT;
KA7nncg;, break;
?xega-l default: //judge the key and send message
!cZIoz break;
Uk#1PcPd }
`3Y+:!q for(int index=0;index<MAX_KEY;index++){
>3/<goXk7 if(hCallWnd[index]==NULL)
nDfDpP& continue;
?M);wBe( if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-b<+Ra {
1{qg@xlj SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Y2fs$emv bProcessed=TRUE;
A}o1I1+ }
"=)`*"rr }
>jm9x1+C }
MH-,+-Eq else if((lParam&0xc000ffff)==1){ //Key down
!`o=2b=N switch(wParam)
"|H0 X# {
%vI]"a@ case VK_MENU:
&+p07 MaskBits|=ALTBIT;
d#su break;
8^~]Ym: case VK_CONTROL:
G}g+2` MaskBits|=CTRLBIT;
C\Rd]P8\ break;
idQr^{ case VK_SHIFT:
OmW|\d PU MaskBits|=SHIFTBIT;
u&:jQ:[ break;
c|XnPqo;f default: //judge the key and send message
E6uIp^E break;
.#SWfAb2h }
+|N"i~f>j for(int index=0;index<MAX_KEY;index++)
rx<fjA% {
ftbu:RtK^^ if(hCallWnd[index]==NULL)
@r<w|x} continue;
!|]%^G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
bZ=d!)%P-{ {
}j
QwP3eY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
QHeUpJ/^ bProcessed=TRUE;
u<[Y6m }
l%fl=i~oN }
;iWCV&>w }
L=>N#QR7 if(!bProcessed){
*Zln\Sx for(int index=0;index<MAX_KEY;index++){
`%VrT` if(hCallWnd[index]==NULL)
_F$?Z continue;
aO{k-44y if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
59|Tmf(dS; SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
is,_r(S }
y~w$>7U. }
$Khc?v }
YRl2e`&jt return CallNextHookEx( hHook, nCode, wParam, lParam );
FRr<K^M }
nX~sVG{Q z;LntQZp- BOOL InitHotkey()
}Q*8QV {
SI\zW[IL if(hHook!=NULL){
MCvjdc3: nHookCount++;
9ItsK return TRUE;
ey:3F% }
:jA~zHO else
eD(#zfP/+ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
Gg/K if(hHook!=NULL)
IP-mo!Y. nHookCount++;
n/?_] return (hHook!=NULL);
z}Q54,9m }
J::dY~@ BOOL UnInit()
NVQIRQ. {
r__uPyIMG/ if(nHookCount>1){
?>e-6*. nHookCount--;
lUDzfJ}3 return TRUE;
0h* AtZv_ }
<~]s+"oVc BOOL unhooked = UnhookWindowsHookEx(hHook);
3]T2Zp&; if(unhooked==TRUE){
SOd(& > nHookCount=0;
hD"Tjd` P hHook=NULL;
1 #_R`(C{ }
/.vB /{2 return unhooked;
N[Fz6,ZG _ }
cu|{cy- A@GyKx%x$ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
74>.E^/x {
' y1=Z BOOL bAdded=FALSE;
f>dWl$/_s for(int index=0;index<MAX_KEY;index++){
7JjTm^bu if(hCallWnd[index]==0){
~R3@GaL1 hCallWnd[index]=hWnd;
!pgkUzMW HotKey[index]=cKey;
|iU#!+zY HotKeyMask[index]=cMask;
`Q,03W#GJ% bAdded=TRUE;
xGN&RjPk\ KeyCount++;
X ZfT;!wF& break;
zUWu5JI }
8|gwH2st~ }
@hp@*$#& 9 return bAdded;
E`BL3+k Q }
ka655O/)& #49,7OBU BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
JpN+'/ {
{qK>A?9 BOOL bRemoved=FALSE;
)D Y?Y-n for(int index=0;index<MAX_KEY;index++){
@xR=bWY if(hCallWnd[index]==hWnd){
074)(X&:x if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
kLK}N>v}X hCallWnd[index]=NULL;
VXQ~PF]z0 HotKey[index]=0;
W2s6!_AN HotKeyMask[index]=0;
Ft'?43J bRemoved=TRUE;
40+~;20 KeyCount--;
(k4> I"x) break;
Q!WXFS }
J'W6NitMr }
?!KqDI }
e~oI0%xl^ return bRemoved;
wP29xV"5 }
)V7bi^r SRyAW\*LWU void VerifyWindow()
N"Q-xK {
#A+ dj|
b for(int i=0;i<MAX_KEY;i++){
7vZznN8e if(hCallWnd
!=NULL){ fnl~0
if(!IsWindow(hCallWnd)){ %8s$l'Q;
hCallWnd=NULL; <;G.(CK@n
HotKey=0; Q#i[Y?$L
HotKeyMask=0; DHQavHqbZ
KeyCount--; ly9.2<oz}L
} Yv\>\?865
} N$i!25F`
} yP.,Dh s
} !/2uO5
X|++K;rtfE
BOOL CHookApp::InitInstance() 8tJB/Pw`S
{ 0CX2dk"UB^
AFX_MANAGE_STATE(AfxGetStaticModuleState()); Bu$Z+o
hins=AfxGetInstanceHandle(); S}WQ~e
InitHotkey(); jInI%
return CWinApp::InitInstance(); yz.a Z
} $DBJ"8n2
>|IUjv2L
int CHookApp::ExitInstance() >NDI<9<'0}
{ Gf*|f"O
VerifyWindow();
XnR9/t
UnInit(); /x\{cHAt8J
return CWinApp::ExitInstance();
UDl[
} ,ELbm
\iVb;7r)9:
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file xvU@,bzz
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) A0JlQE&U
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ EbXWCD
#if _MSC_VER > 1000 t*KgCk 1
#pragma once :%!`R72
#endif // _MSC_VER > 1000 6ZKSet8
kbu.KU+
class CCaptureDlg : public CDialog vuN!7*d+
{ :Aq==N_/2
// Construction R<]f[
public: !X5n'1&
BOOL bTray; .d/e?H:
BOOL bRegistered; ,%Sf,h?"^
BOOL RegisterHotkey();
vf}.)
UCHAR cKey; =r=?N\7I
UCHAR cMask; NFsj
~6F#
void DeleteIcon(); ?9W2wqN>o
void AddIcon(); J7a_a>Y
UINT nCount; rW),xfo0
void SaveBmp(); oQ
YmywY
CCaptureDlg(CWnd* pParent = NULL); // standard constructor `0)'&HbLY
// Dialog Data jxeZ,w o
//{{AFX_DATA(CCaptureDlg) *e/8uFX
enum { IDD = IDD_CAPTURE_DIALOG }; |&wwH&<[z
CComboBox m_Key; ol#|
.a2O
BOOL m_bControl; tg5G`P5PJ
BOOL m_bAlt; ~IQ3B$4H&
BOOL m_bShift; {XR3L'X
CString m_Path; NW?.Ge.!P
CString m_Number; -0P(lkylf
//}}AFX_DATA <+3-(&
// ClassWizard generated virtual function overrides u]`ur#_
//{{AFX_VIRTUAL(CCaptureDlg) QTe>EJ12
public: a]NH >d
virtual BOOL PreTranslateMessage(MSG* pMsg); Ga,+
protected: 2d:IYCl4q
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support V
d`}F0WD
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); J2Y
S+%K
//}}AFX_VIRTUAL iC(&U YL
// Implementation ;cpQ[+$nKp
protected: _98
%?0
HICON m_hIcon; +T!7jC(O
Q
// Generated message map functions ZlEQzL~
//{{AFX_MSG(CCaptureDlg) _4^#VD#f
virtual BOOL OnInitDialog(); J) I|Xot
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); (?y (0%q
afx_msg void OnPaint(); lE|Hp
afx_msg HCURSOR OnQueryDragIcon(); >n(Ga9E
virtual void OnCancel(); xQU$E|I
afx_msg void OnAbout(); n.L/Xp@gc
afx_msg void OnBrowse(); @T 5dPmn
afx_msg void OnChange(); o%j[]P@4G
//}}AFX_MSG E'KKR1t
DECLARE_MESSAGE_MAP()
iup "P
}; CQ;.}=j
,
#endif |g)/6jG<-
;nx? 4f+6h
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file u*w'.5l
#include "stdafx.h" 4s_|6{ANS
#include "Capture.h" Rlyx&C8
#include "CaptureDlg.h" 2WF7^$^:
#include <windowsx.h> .G/>X%X
#pragma comment(lib,"hook.lib") MdKkj[#
#ifdef _DEBUG ;:Kd?Tz$
#define new DEBUG_NEW A,fP l R
#undef THIS_FILE Gq)E,Ln&d
static char THIS_FILE[] = __FILE__; veq.48E]
#endif SJ0IEPk
#define IDM_SHELL WM_USER+1 G_1`NyI
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); z\g6E/ %%
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); yb 4Jsk5%
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; e09('SON(
class CAboutDlg : public CDialog .).}ffhOL
{ ,'}qLor
public: N0mP
EF2
CAboutDlg(); #0uD&95<
// Dialog Data ca6kqh"
//{{AFX_DATA(CAboutDlg) 0pW?v:!H
enum { IDD = IDD_ABOUTBOX }; HzdyfZ!jR
//}}AFX_DATA qvH RP@
// ClassWizard generated virtual function overrides Bj1{=Pvl
//{{AFX_VIRTUAL(CAboutDlg) #)BbW40f6
protected: 5`tMHgQO
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support /\-iV)h1@
//}}AFX_VIRTUAL ]
-}Zd\Rs
// Implementation W|,Y*l
protected: I
7 B$X=
//{{AFX_MSG(CAboutDlg) xtq='s8e
//}}AFX_MSG P\k5%
DECLARE_MESSAGE_MAP() \:/~IZdzF
}; rf\A[)<:
&Cykw$s
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Ms61FmA4
{ ZvVrbj&
//{{AFX_DATA_INIT(CAboutDlg) JlMD_p A
//}}AFX_DATA_INIT -F338J+J24
} 5J vrQGvL
bf*VY&S-T
void CAboutDlg::DoDataExchange(CDataExchange* pDX) @gM>Lxj
{ aMq|xHZ
CDialog::DoDataExchange(pDX); ]IQ`.:g=9
//{{AFX_DATA_MAP(CAboutDlg) 3;-P (G@
//}}AFX_DATA_MAP @!np
0#
} "j*{7FBqk
r@)_>(
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 0 v>*P*
//{{AFX_MSG_MAP(CAboutDlg) .z6"(?~
// No message handlers bsosva+
//}}AFX_MSG_MAP .?^a|]
END_MESSAGE_MAP() 9]]isE8r
CtO;_;eD'
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) D *Hy 2eZ.
: CDialog(CCaptureDlg::IDD, pParent) xhTiOt6l
{ >3SZD
//{{AFX_DATA_INIT(CCaptureDlg) yKb+bm&5:'
m_bControl = FALSE; NpLO_-
m_bAlt = FALSE; YEiQ`sYKG
m_bShift = FALSE; Lbwc2Q,.-
m_Path = _T("c:\\"); }bA@QEJ
m_Number = _T("0 picture captured."); G\4*6iw:
nCount=0; l2|[
bRegistered=FALSE; T=~D>2C
bTray=FALSE; [gE_\=FSKu
//}}AFX_DATA_INIT L5{DWm~@
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 ")xd 'V
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); ^f?>;,<&
} WETnrA"N
%xuJQuCqf
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 7}%Z>
{ fC<pCdsg
CDialog::DoDataExchange(pDX); Jb1L[sT2
//{{AFX_DATA_MAP(CCaptureDlg) ze_q+Z
DDX_Control(pDX, IDC_KEY, m_Key); 8G<{L0J%!
DDX_Check(pDX, IDC_CONTROL, m_bControl); r&0IhE
DDX_Check(pDX, IDC_ALT, m_bAlt); >u=Dc.lX
DDX_Check(pDX, IDC_SHIFT, m_bShift); tX'2 $}
DDX_Text(pDX, IDC_PATH, m_Path); m6 V L
DDX_Text(pDX, IDC_NUMBER, m_Number); edZhI
//}}AFX_DATA_MAP eWw#
T^
} ;GF+0~5>
o1^Rx5
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) HCIS4}lQ
//{{AFX_MSG_MAP(CCaptureDlg) aFf(m-
ON_WM_SYSCOMMAND() Nfo`Q0\[P
ON_WM_PAINT() 8Ts_;uId
ON_WM_QUERYDRAGICON() g*-%.fNA
ON_BN_CLICKED(ID_ABOUT, OnAbout) u,&[I^WK`C
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) q7kE+z
ON_BN_CLICKED(ID_CHANGE, OnChange) q1_iV.G<
//}}AFX_MSG_MAP mYRsM s
END_MESSAGE_MAP() vDit&Lh{T
)/mBq#ZS
BOOL CCaptureDlg::OnInitDialog()
d")TH 3pG
{ gi#g)9HG
CDialog::OnInitDialog(); !Sj0! \
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); 2Q81#i'Cm
ASSERT(IDM_ABOUTBOX < 0xF000); F!*tE&Se+
CMenu* pSysMenu = GetSystemMenu(FALSE); -RKqbfmi=
if (pSysMenu != NULL) b2vCr F;
{ sO$X5S C9
CString strAboutMenu; )z=L^ot
strAboutMenu.LoadString(IDS_ABOUTBOX); E9 6`
aF{]
if (!strAboutMenu.IsEmpty()) `SM37({c
{ `-)Hot)
pSysMenu->AppendMenu(MF_SEPARATOR); 1n-+IR"
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); viXt]0
} vp2s)W8W
} , SB5"
SetIcon(m_hIcon, TRUE); // Set big icon 8%Eemk >G{
SetIcon(m_hIcon, FALSE); // Set small icon Ax{C ^u
m_Key.SetCurSel(0); 7%)KB4(\_
RegisterHotkey(); BH3%dh:9
CMenu* pMenu=GetSystemMenu(FALSE); ;'i>^zX`
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); <yg!D21Y
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); B$D7}=|kc
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); Z#znA4;)
return TRUE; // return TRUE unless you set the focus to a control T6^H%;G
} !E.CpfaC
t;/s^-}
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) 3D^!U}E
{ mnm7{?#[
if ((nID & 0xFFF0) == IDM_ABOUTBOX) IDn$w^"
{ +JlPQ~5
CAboutDlg dlgAbout; W<tw],M-#
dlgAbout.DoModal(); ;w(tXcXZ
} DU|>zO%
else AU3>v
{ ,
aJC7'(
CDialog::OnSysCommand(nID, lParam); 8m"(T-wb6{
} 1a@b-V2
d&
} V*j1[d
ttfCiP$
void CCaptureDlg::OnPaint() P,W(9&KM
{ YQN@;
if (IsIconic()) )Rc
{ ~pWV[oUD
CPaintDC dc(this); // device context for painting :N#8|;J1Fl
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); ["N_t:9I
// Center icon in client rectangle C.N#y`g
int cxIcon = GetSystemMetrics(SM_CXICON); LCMZw6p
int cyIcon = GetSystemMetrics(SM_CYICON); <Gw>}/-^
CRect rect; A(}D76o_
GetClientRect(&rect); IlfH
int x = (rect.Width() - cxIcon + 1) / 2; 9YEE.=]T
int y = (rect.Height() - cyIcon + 1) / 2; 5lrjM^E|
// Draw the icon d3jzGJrU}
dc.DrawIcon(x, y, m_hIcon); kkU#0p? 7
} kA4bv}
else 1Rd2Xb
{ tYUg%2G
CDialog::OnPaint(); Q$58K9
} uWDWf5@
} 4`zK`bRcK#
5iZx
-M
HCURSOR CCaptureDlg::OnQueryDragIcon() hn[lhC
{ opfg %*
return (HCURSOR) m_hIcon; kps}i~Jb
} s0\}Q=s[
=Ohro'
void CCaptureDlg::OnCancel() T o$D[-
{ vf0
fa46
if(bTray) c@|f'V4
DeleteIcon(); )zAATBb4.
CDialog::OnCancel(); &hu3A)%
} ,R[<+!RS
6(8zt"E
void CCaptureDlg::OnAbout() ZO8r8
[
{ 'BX
U'
CAboutDlg dlg; D $&6 8
dlg.DoModal(); $Y?[[>u
} I''X\/|
V i<6i0
void CCaptureDlg::OnBrowse() q_86nvB<
{ &1FyauH
CString str; ,Q,3^v-
BROWSEINFO bi; e !N%
char name[MAX_PATH]; Y,M2D
ZeroMemory(&bi,sizeof(BROWSEINFO)); b NR@d'U
bi.hwndOwner=GetSafeHwnd(); 2Kz407|'
bi.pszDisplayName=name; .1F41UyL
bi.lpszTitle="Select folder"; on.m
'-s
bi.ulFlags=BIF_RETURNONLYFSDIRS; [Wn6d:
LPITEMIDLIST idl=SHBrowseForFolder(&bi); #3}!Q0
if(idl==NULL) yi:1cLq2
return; t*wV<b
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); Q`!<2i;
str.ReleaseBuffer(); +ux170Cd3
m_Path=str; gQ$0 |0O
if(str.GetAt(str.GetLength()-1)!='\\') 6QePrf
m_Path+="\\"; FV\$M6
_
UpdateData(FALSE); ks7id[~&iY
} $E-c%-
m2v'zJd}g
void CCaptureDlg::SaveBmp() 2Q)pT$
{ ]zh6[0V7V
CDC dc; Yv"-_
dc.CreateDC("DISPLAY",NULL,NULL,NULL); /E^j}H{
CBitmap bm; WQBpU?O
int Width=GetSystemMetrics(SM_CXSCREEN); aC#{@t
int Height=GetSystemMetrics(SM_CYSCREEN); 9 E2OCLWrE
bm.CreateCompatibleBitmap(&dc,Width,Height); /NUu^ N
CDC tdc; %9b TfX"
tdc.CreateCompatibleDC(&dc); H+npe'm_Z
CBitmap*pOld=tdc.SelectObject(&bm); 8I<LZ{a10
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); %
|G"ZPO?
tdc.SelectObject(pOld);
LX</xI08W
BITMAP btm; * TByAa{
bm.GetBitmap(&btm); kb[+II
DWORD size=btm.bmWidthBytes*btm.bmHeight;
,+!|~1
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); qF4=MQm\aE
BITMAPINFOHEADER bih; >o5eyi
bih.biBitCount=btm.bmBitsPixel; ^w*&7.Z
bih.biClrImportant=0; Rf TG
5E)
bih.biClrUsed=0; 4?Qc&e{5
bih.biCompression=0; }*,z~y}V#
bih.biHeight=btm.bmHeight; 5!qLJmd=
bih.biPlanes=1; CO{AC~
bih.biSize=sizeof(BITMAPINFOHEADER); <4Ik]Uz^
bih.biSizeImage=size;
u"-."_
bih.biWidth=btm.bmWidth; ,B$e'KQ
bih.biXPelsPerMeter=0; 1i}p?sU
bih.biYPelsPerMeter=0; Ns6CxE9
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); \9k{h08s
static int filecount=0; Z&5cJk
W
CString name; -)[~%n#X+t
name.Format("pict%04d.bmp",filecount++); G\#dMCk?
name=m_Path+name; AME<V-5
BITMAPFILEHEADER bfh; T;#:Y
bfh.bfReserved1=bfh.bfReserved2=0; FB
n . 4
bfh.bfType=((WORD)('M'<< 8)|'B'); Am=O-;
b'8
bfh.bfSize=54+size; I 8 Ls_$[
bfh.bfOffBits=54; `! _mIh}
CFile bf; X;d 1@G
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ gsVm)mkd
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); [-h=L
Jf#
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); [-2Tj)P
C
bf.WriteHuge(lpData,size); $o^N_`l
bf.Close(); v2 }>/b)
nCount++; <zp|i#~
} S<>u
GlobalFreePtr(lpData); s=1w6ZLD
if(nCount==1) Atod&qH
m_Number.Format("%d picture captured.",nCount); k!{h]D0
else ~"22X`;h[G
m_Number.Format("%d pictures captured.",nCount); !CLL{\F
UpdateData(FALSE); D`NQEt"(
} c1h?aP
Z(hRwIOF
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) I ka
V g L
{ >:P-3#e*
if(pMsg -> message == WM_KEYDOWN) CM
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{ rQ&F Gb
if(pMsg -> wParam == VK_ESCAPE) )P9&I.a8
return TRUE; {%QWv%|
if(pMsg -> wParam == VK_RETURN) .2/W.z2
return TRUE; <v$yXA
} :2-!bLo}&
return CDialog::PreTranslateMessage(pMsg); ,e+S7YX
} ^A$p)`KR
J4jL%5t
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) =:Lc-y >
{ *.zC 9Y,
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ y])z,#%ED
SaveBmp(); <%=@Ue
return FALSE; zN>tSdNkI-
} H)NT2@%{P
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ T@j@IEGH
CMenu pop; XZ_vbYTj
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); =QW:},sp
CMenu*pMenu=pop.GetSubMenu(0); S/Gy:GIf
pMenu->SetDefaultItem(ID_EXITICON); leO..M
CPoint pt; 9FmX^t$T
GetCursorPos(&pt); qrY]tb^K
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); X;3gKiD
if(id==ID_EXITICON) >?ckBU9
DeleteIcon(); [-w+ACV~
else if(id==ID_EXIT) HKYJgx
OnCancel(); ,dSP%?vV
return FALSE; U\UlQp?
} |oTA$bln
LRESULT res= CDialog::WindowProc(message, wParam, lParam); FoGSCg%
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) S3&lkN5
AddIcon(); Tw!_=zy(Gw
return res; TbR!u:J
} H6i;MQ
l5l#LsaQb
void CCaptureDlg::AddIcon() jfsbvak
{ ,Cj` 0v#
NOTIFYICONDATA data; |H4f&&Wd
data.cbSize=sizeof(NOTIFYICONDATA); Uf<IXx&;
CString tip; <jtu/U]78|
tip.LoadString(IDS_ICONTIP); I2*\J)|f
data.hIcon=GetIcon(0); %<;PEQQ|C
data.hWnd=GetSafeHwnd(); _2nNCu (
strcpy(data.szTip,tip); mY!&*nYn|
data.uCallbackMessage=IDM_SHELL; 6"_ytqw7
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; rPF2IS(5
data.uID=98; XV:icY
Shell_NotifyIcon(NIM_ADD,&data); U-lN-/=l6
ShowWindow(SW_HIDE); yn KgNi
bTray=TRUE; 9vJ'9Z2\
} .?;"iv+
U$AV"F&!&}
void CCaptureDlg::DeleteIcon() "78BApjWT6
{ rWxQ;bb#
NOTIFYICONDATA data; 75RQ\_zDu
data.cbSize=sizeof(NOTIFYICONDATA); Hy#<fKz`!
data.hWnd=GetSafeHwnd(); o :_'R5
data.uID=98;
d/&~IR
Shell_NotifyIcon(NIM_DELETE,&data); SMbhJ}\O
ShowWindow(SW_SHOW); y<*/\]t9L[
SetForegroundWindow(); 'A#F< x
ShowWindow(SW_SHOWNORMAL); (xlAS
bTray=FALSE;
F!~o J
} QOKE9R#Y
_.K<#S
void CCaptureDlg::OnChange() i2m+s;
{ ^HI}bS1+|
RegisterHotkey(); wsyAq'%L
} b%D}mxbS
ky|Py
BOOL CCaptureDlg::RegisterHotkey() +G[N
lb
{ Nm, 9xq
UpdateData(); 88 M$mjx
UCHAR mask=0; 6@cT;=W;xj
UCHAR key=0; 0Nq6>^
%
if(m_bControl) EHcgWlTu
mask|=4; 6YpP/
K
if(m_bAlt) 7W `gN[*
mask|=2; .lIkJQ3d
if(m_bShift) ,5/zTLd
mask|=1; mybvD
key=Key_Table[m_Key.GetCurSel()]; ^V;2v? O
if(bRegistered){ }@avGt;v
DeleteHotkey(GetSafeHwnd(),cKey,cMask); o%$'-N
bRegistered=FALSE; Bd-@@d.H<
} LSW1,}/B
cMask=mask; +6+!M_0wA
cKey=key; 2JS&zF
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _S;Fs|p_
return bRegistered; <R@w0b>
} <-K'9ut,
DW.vu%j^[
四、小结 {G(N vf,K]
LFT)_DG7(
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。