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:
\!s0H_RJY
/<)kI(gf 一、实现方法
~zyD=jxP9 V@`A:Nc_> 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:
Z
lR2 CNrK]+> #pragma data_seg("shareddata")
C#:L.qK HHOOK hHook =NULL; //钩子句柄
VD+y4t'^ UINT nHookCount =0; //挂接的程序数目
z0xw0M+X static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
:i/uRR static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
0%;y'd**Ck static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
*L=F2wW static int KeyCount =0;
BiD}C static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
H\<^p",` #pragma data_seg()
=O'>H](Q 6w*q~{"( 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。
1 2J#}| "cx#6Bo| 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:
M:cW/&ZJ m
4V0e~] BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
VTs
,Ln!,U cKey,UCHAR cMask)
UCI !>G {
w/Y6m.i1 BOOL bAdded=FALSE;
@{o3NR_ for(int index=0;index<MAX_KEY;index++){
W'f)W4D$6 if(hCallWnd[index]==0){
i3U_G^8 hCallWnd[index]=hWnd;
%C~LKs5oH HotKey[index]=cKey;
k/.a
yLq HotKeyMask[index]=cMask;
!R3ZyZcX bAdded=TRUE;
Y!fgc<]'& KeyCount++;
xL}~R7 break;
A&7~]BR\ }
#ByrX\ }
z-`-0@/A$ return bAdded;
GCv*a[8?n }
EbMG9 //删除热键
TY*uK BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
@Xl/<S& {
V8+8?5'l BOOL bRemoved=FALSE;
wfrSI:+> for(int index=0;index<MAX_KEY;index++){
Z Ne(sg~G if(hCallWnd[index]==hWnd){
=SpD6
9-H if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
G ,?l
o=m hCallWnd[index]=NULL;
z P=3B%$ HotKey[index]=0;
zjUT:#(k HotKeyMask[index]=0;
%fB!XCW bRemoved=TRUE;
9P\R?~3 KeyCount--;
K4j2xSGeo break;
q.Vcb!*$ }
7) }
-/gAb<= }
6*%E4#4 return bRemoved;
vz}_^8O }
P"ATqQG%D l_0/g^( oz#;7
?9 DLL中的钩子函数如下:
(#5TM1/A {5J: ]{p LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
y5$AAas {
O+*<^*YyD BOOL bProcessed=FALSE;
jb0LMl}/A if(HC_ACTION==nCode)
RAi]9` *7 {
w5R?9"d@ if((lParam&0xc0000000)==0xc0000000){// 有键松开
/4bHN:I]M switch(wParam)
z<z\) {
kbKGGn4u case VK_MENU:
X}RQ&k MaskBits&=~ALTBIT;
{+^qm8n break;
O YayTKxN case VK_CONTROL:
oC >l|?h, MaskBits&=~CTRLBIT;
tk~<tqMq break;
PYJ8\XZ1_N case VK_SHIFT:
3v@Y"I3; MaskBits&=~SHIFTBIT;
H*V Z&{\7 break;
>TB Rp,;r default: //judge the key and send message
+Qo]'xKr break;
Mi2lBEu, }
uZkh. 0yB for(int index=0;index<MAX_KEY;index++){
'c&S%Ra[3G if(hCallWnd[index]==NULL)
p!RyxB1.| continue;
Ct\n1T } if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
O.^1r {
Hsvu&>[`S SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
XR.Sm<A[ bProcessed=TRUE;
026|u|R }
J'4V_Kjg- }
Az4a|. }
NkL>ru!b9 else if((lParam&0xc000ffff)==1){ //有键按下
8*m=U@5] switch(wParam)
x9B5@2J1 {
J4>k9~q case VK_MENU:
iIO_d4Z MaskBits|=ALTBIT;
&HIG776 break;
U1~6 o"1H case VK_CONTROL:
+u]L#].; MaskBits|=CTRLBIT;
gaa;PX break;
#(f- cK case VK_SHIFT:
@-H D9h MaskBits|=SHIFTBIT;
SRBQ"X[M2 break;
`8<h aU default: //judge the key and send message
usz H1@g' break;
siK:?A@4D }
U?sio%`( for(int index=0;index<MAX_KEY;index++){
JtGBNz!" if(hCallWnd[index]==NULL)
z4iZE*ZS continue;
RY9h^q* if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
FNB4YZ6 {
VT~jgsY SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
``9`Xq bProcessed=TRUE;
=BNS3W6 }
A@qwD300Vo }
<Z58"dg.5 }
+tSfx if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
1 wB2:o< for(int index=0;index<MAX_KEY;index++){
`ot<BwxJ if(hCallWnd[index]==NULL)
Md(h-wYr continue;
y`Km96Ui if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
Y KWtsy SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
p5PTuJ>q //lParam的意义可看MSDN中WM_KEYDOWN部分
pJ;4rrSK }
|\iJ6m;a }
Z%1{B*(e }
)AoF-&,w return CallNextHookEx( hHook, nCode, wParam, lParam );
W\l"_^d*
}
f )K(la^' Mw9;O6 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:
/C"?Y' %jRqrICd BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
,a1
1&"xl BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
u&\QZW? ,8/Con|o 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:
zy!mP ;0 No@G;z LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
DgiMMmpE {
qp)a`'Pq if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
cJ#|mzup {
v#WD$9QWs //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
T>\r}p SaveBmp();
R}VEq gq return FALSE;
Al 1BnFB }
*&A/0]w …… //其它处理及默认处理
!3 j@gi2 }
pXBlTZf 'X@>U6s IQya{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。
Zwxu3R_ q;0QI{:5v 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。
dB%q`7O "Nlw&+
c7 二、编程步骤
x;L.j7lzA; 'hn=X7 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";
@+ee0
CLT 1j":j %9M 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
+kN/-UsB oGa8#> 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;
w +~,Mv \ x8q3 Njr 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_\-
]m&g rW<sQ0 5、 添加代码,编译运行程序。
$b=4_UroS tH\ aHU[ 三、程序代码
;4]
s P^+ vx&r ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
@&
vtY._ #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
2^.qKY@g@ #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
B^C!UWN>%X #if _MSC_VER > 1000
{ :m%n- #pragma once
e6JT|>9A7 #endif // _MSC_VER > 1000
rs?"pGz; #ifndef __AFXWIN_H__
@M!WosRk #error include 'stdafx.h' before including this file for PCH
c6"hk_ #endif
$&l}
ABn #include "resource.h" // main symbols
1P1"xT class CHookApp : public CWinApp
~Vf+@_G8` {
M^twD* public:
*6b$l.Vs CHookApp();
G*x"drP // Overrides
6;8Jy // ClassWizard generated virtual function overrides
z/&2Se: //{{AFX_VIRTUAL(CHookApp)
"`''eV3 public:
8p)*;Y virtual BOOL InitInstance();
j4hiMI; virtual int ExitInstance();
ds9L4zfO //}}AFX_VIRTUAL
/y~ "n4CK~ //{{AFX_MSG(CHookApp)
Z F&aV? // NOTE - the ClassWizard will add and remove member functions here.
a&*fk ?o // DO NOT EDIT what you see in these blocks of generated code !
43p0k&;-7 //}}AFX_MSG
f3u^:6U~ DECLARE_MESSAGE_MAP()
M*x1{g C/ };
Ous_269cM LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
PIxd'B*MF BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
A,4|UA?- BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
{vL4:K BOOL InitHotkey();
6IyD7PQ BOOL UnInit();
sMhUVc4 #endif
b9(_bsc DL:wiQ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
B- `,h pp #include "stdafx.h"
q\f Z Q #include "hook.h"
0s#`H #include <windowsx.h>
P$=BmBq18` #ifdef _DEBUG
y:>'1"2` #define new DEBUG_NEW
@! gJOy #undef THIS_FILE
Hi{1C"% static char THIS_FILE[] = __FILE__;
(E.,kcAJ #endif
f4Yn=D=_ #define MAX_KEY 100
Q#}
0pq #define CTRLBIT 0x04
Cb5Rr+K= #define ALTBIT 0x02
6zfi\(fop #define SHIFTBIT 0x01
wx,yx3c ( #pragma data_seg("shareddata")
`l0&,] HHOOK hHook =NULL;
i{9_C/ UINT nHookCount =0;
_ 3l ci static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
,%zU5 hh static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
`?H yDny static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
:"pA0oB static int KeyCount =0;
@},25"x) static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
p[zKc2 TPk #pragma data_seg()
vA r
fsgk HINSTANCE hins;
=d{B.BP( void VerifyWindow();
1oSrhUTy BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
$%3"@$ //{{AFX_MSG_MAP(CHookApp)
:s}6 a23 // NOTE - the ClassWizard will add and remove mapping macros here.
v9t26>{~ // DO NOT EDIT what you see in these blocks of generated code!
[1\k'5rp //}}AFX_MSG_MAP
eA$wJ$* END_MESSAGE_MAP()
PDEeb.(. +mgmC_Q(0 CHookApp::CHookApp()
BcfW94 {
VW[!%< // TODO: add construction code here,
2qF
?% // Place all significant initialization in InitInstance
R2 I
7d'|v }
_7#9nJ3| 1JFCYJy CHookApp theApp;
nX|f?5 O LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
U^n71m>]%T {
XIAHUT5~J BOOL bProcessed=FALSE;
_8f?
H#& if(HC_ACTION==nCode)
VT;Vm3\ {
d*e0/#s if((lParam&0xc0000000)==0xc0000000){// Key up
+@ FM~q switch(wParam)
]hPu {
*&d>Vk."] case VK_MENU:
/ehmy(zL MaskBits&=~ALTBIT;
^J
TrytIB break;
~T{^7"q\ case VK_CONTROL:
~'[0-_]=f MaskBits&=~CTRLBIT;
VJeoO)<j break;
_shoh case VK_SHIFT:
BXCB/:0 MaskBits&=~SHIFTBIT;
#'@pL0dj break;
sr=~Uq{g default: //judge the key and send message
gNsas:iGM break;
IsC`r7 }
+p%!G1Yz for(int index=0;index<MAX_KEY;index++){
;_HG
5}i if(hCallWnd[index]==NULL)
J*n Q(*e continue;
R8*z}xy{ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
"
aEk#W {
<:,m SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
^{IF2_h" bProcessed=TRUE;
3($ cBC }
Z/r =4 }
.]0u#fz0y }
nkp, else if((lParam&0xc000ffff)==1){ //Key down
iE~][_%U switch(wParam)
us,!U {
*u i!|; case VK_MENU:
)nK-39,G MaskBits|=ALTBIT;
I:ag}L8` break;
r}-si^fo; case VK_CONTROL:
RWe$ZZSz! MaskBits|=CTRLBIT;
Q||vU break;
N5yt'.d case VK_SHIFT:
Cw*:` MaskBits|=SHIFTBIT;
W7_j;7' break;
*CIR$sS default: //judge the key and send message
|B<;4ISaRI break;
BkP'b{z| }
S[2uez` for(int index=0;index<MAX_KEY;index++)
?>p(* {
&$1ifG if(hCallWnd[index]==NULL)
;yvx - continue;
!R;NV|.eI6 if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
JZa^GW:YQh {
rkF>c SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
fbG+.' bProcessed=TRUE;
`Mh3v@K: }
8zMt&5jD }
]f3[I3;K }
$:7T if(!bProcessed){
al<;*n{/ for(int index=0;index<MAX_KEY;index++){
>{seaihK if(hCallWnd[index]==NULL)
OzVCqq"] continue;
O3YD
jas if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
VP7g::Ab SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
}f~:>N# }
+ Z7 L&BI }
,[}
XK9 }
R;G"LT return CallNextHookEx( hHook, nCode, wParam, lParam );
7z_EX8^ }
P?#I9y7iP _|'e Az BOOL InitHotkey()
StuQ} {
y.xyr"-Q if(hHook!=NULL){
m#i5}uHHg nHookCount++;
8NE+G.:G return TRUE;
>{v,HOxl }
ho'Ihep,L else
L<}0}y hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
^Uj\s / if(hHook!=NULL)
t-;zgW5mwF nHookCount++;
iFJ1}0<(x return (hHook!=NULL);
R/_bk7o]H }
zF)&o} BOOL UnInit()
Ug VLHwkvk {
@26gP:Um if(nHookCount>1){
Y-&SZI4H nHookCount--;
)U?5O$M;lE return TRUE;
XY_zFF }
nQtp 4 BOOL unhooked = UnhookWindowsHookEx(hHook);
?g6xy[ if(unhooked==TRUE){
=ObI nHookCount=0;
3Uy4 8ue hHook=NULL;
1 +0-VRl }
>8*0"Q return unhooked;
ef Moi 'v }
l\HLlwYO **D3.-0u& BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
NMM$
m!zg {
UdiogXZ BOOL bAdded=FALSE;
,:E*Mw: for(int index=0;index<MAX_KEY;index++){
__3s3YG if(hCallWnd[index]==0){
NrVE[Z# hCallWnd[index]=hWnd;
)'+
tb\g HotKey[index]=cKey;
T"b'T>Y HotKeyMask[index]=cMask;
M MQ^&!H bAdded=TRUE;
BidTrO KeyCount++;
y^*o%2/ break;
t1Zcr#b> }
MR?5p8S#g }
lWR". return bAdded;
9tMaOm }
TEzMFu+V 9sgyg3fv>5 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
pGsk[. {
k6}M7&nY BOOL bRemoved=FALSE;
*K57($F for(int index=0;index<MAX_KEY;index++){
TI<?h(*R_ if(hCallWnd[index]==hWnd){
Q|6lp if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
]U,c`?[7# hCallWnd[index]=NULL;
P,eP>55'K HotKey[index]=0;
4eRV?tE9 HotKeyMask[index]=0;
2m*g,J?ql bRemoved=TRUE;
(\I9eBm KeyCount--;
pef)c,U$ break;
_<8~CWo: }
qDVt }
^5GyW`a}
}
)Z=S'm
k4_ return bRemoved;
q;)+O#CR }
pnpx`u; Qms,kX void VerifyWindow()
QMz6syn4u {
vg"$&YX9" for(int i=0;i<MAX_KEY;i++){
Zw`9B if(hCallWnd
!=NULL){ \se
/2l
if(!IsWindow(hCallWnd)){ #H5i$ o
hCallWnd=NULL; Fmd^9K
HotKey=0; !1b4q/
HotKeyMask=0; 5fT"`FL?
KeyCount--; auai@)v6
} [wO|P{8\"
} blk4@pg
} +W7#G `>
} JQ~[$OGH
SJJ[y"GvD
BOOL CHookApp::InitInstance() "C/X#y
{ &Rp/y%9
AFX_MANAGE_STATE(AfxGetStaticModuleState()); hHsN(v
hins=AfxGetInstanceHandle(); X1C
&;5
InitHotkey(); ]_EJ "'x
return CWinApp::InitInstance(); \,ko'48@
} JS^QfT,zE
v\3
\n3[u
int CHookApp::ExitInstance() ,8`CsY^1
{ DTMoZm
VerifyWindow(); F*['1eAmdY
UnInit(); 11g_!X -g@
return CWinApp::ExitInstance(); ~ubcD6f
} v.q`1D1=t
"T4buTXJ
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file *De}3-e1b
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) \+T U{vr
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ _pN:p7l(
#if _MSC_VER > 1000 Ds<~JfVl
#pragma once +I>V9%%vW_
#endif // _MSC_VER > 1000 $[xS>iuD
r1A<XP|1?I
class CCaptureDlg : public CDialog 49Q
tfk
{ q(9S4F
// Construction Yf?hl
public: 51Q m2,P1^
BOOL bTray; Q|7$SS6$
BOOL bRegistered; ?lPyapA]
BOOL RegisterHotkey(); 8JFvz(SK>
UCHAR cKey; 4/?@ %
UCHAR cMask; Pea2ENe3
void DeleteIcon(); @km@\w
void AddIcon(); Klj -dz
UINT nCount; uf/4vz,
void SaveBmp(); 2CY4nSKW
CCaptureDlg(CWnd* pParent = NULL); // standard constructor &~K4I
// Dialog Data #7r13$>!
//{{AFX_DATA(CCaptureDlg) ]5',`~jkF
enum { IDD = IDD_CAPTURE_DIALOG }; 8fSY@
CComboBox m_Key; =MjkD)l
BOOL m_bControl; N!~5S`
BOOL m_bAlt; W'Y?X]xr
BOOL m_bShift; }Sr=|j
CString m_Path; ) -^(Su(!
CString m_Number; @j`gxM_-O
//}}AFX_DATA ?e#bq]
// ClassWizard generated virtual function overrides xiy=D5N.=
//{{AFX_VIRTUAL(CCaptureDlg) *w`_(Xf
public: s|[CvjL#0
virtual BOOL PreTranslateMessage(MSG* pMsg); w\zNn4B})A
protected: *w
OU=1+
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support BA6(Owb
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); wec_=EqK0
//}}AFX_VIRTUAL rX}FhBl5
// Implementation vs%d}]v
protected: _O3X;U7rc
HICON m_hIcon; 0$B X8?Z
// Generated message map functions 5rH?FQE
//{{AFX_MSG(CCaptureDlg) ^r@,(r6w
virtual BOOL OnInitDialog(); `Fx+HIng,
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); .2{*>Dzi
afx_msg void OnPaint(); +:kMYL3
afx_msg HCURSOR OnQueryDragIcon(); Jq*Q;}n
virtual void OnCancel(); wA2^I70-
afx_msg void OnAbout(); 7ND4Booul
afx_msg void OnBrowse(); L-DL)8;`
afx_msg void OnChange(); E"zC6iYZ;
//}}AFX_MSG k!"6mo@rd
DECLARE_MESSAGE_MAP() [:gp_Z&
}; U62Z ?nge%
#endif {HtW`r1)Tt
4Ifz-t/
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file -A^o5s
#include "stdafx.h" Vj[hT~{f
#include "Capture.h" 'mTQ=1
#include "CaptureDlg.h" _ -|+k
#include <windowsx.h> &d_2WQ}
#pragma comment(lib,"hook.lib") sH.,O9'r
#ifdef _DEBUG JLak>MS
#define new DEBUG_NEW G Ml JM
#undef THIS_FILE 8gxo{<,9
static char THIS_FILE[] = __FILE__; Y~k,AJ{ ^
#endif &)izh) FA
#define IDM_SHELL WM_USER+1 _%wB*u,X
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); `O]$FpO
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); <<PXh&wu0
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; S1o[)q
class CAboutDlg : public CDialog }z F,dst
{ 0[f[6mm%m
public: :?j]W2+kR
CAboutDlg(); Jb6)U]
// Dialog Data wv
//{{AFX_DATA(CAboutDlg) 1 T}jK^"
enum { IDD = IDD_ABOUTBOX }; e^k)756
//}}AFX_DATA |pZ:5ta#
// ClassWizard generated virtual function overrides ny}_^3
//{{AFX_VIRTUAL(CAboutDlg) _`lPLBr6
protected: TF?~vS%@P
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support "0Z5cQjg
//}}AFX_VIRTUAL Zg9VkL6Z6
// Implementation CT/>x3o
protected: fRjp(m
//{{AFX_MSG(CAboutDlg) a$3 ]`
//}}AFX_MSG quS]26wQz
DECLARE_MESSAGE_MAP() i1 c[Gk.o
}; wpD}#LRfm
eExI3"|Q
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) *z^Au7,&
{
s&iu+>
//{{AFX_DATA_INIT(CAboutDlg) kkIG{Bw
//}}AFX_DATA_INIT x~ID[
} AquO#A[,#
f\?1oMO\
void CAboutDlg::DoDataExchange(CDataExchange* pDX) =\M6s
{ n?QglN
CDialog::DoDataExchange(pDX); >*EJ6FPO
//{{AFX_DATA_MAP(CAboutDlg) $ I
J^
//}}AFX_DATA_MAP j8+>E?nm
} deEc;IAo
b!qlucAeE
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 6OR) 97
//{{AFX_MSG_MAP(CAboutDlg) kZ= 2#.
// No message handlers RG 9iTA'
//}}AFX_MSG_MAP OQVo4yl"
END_MESSAGE_MAP() IEe;ygL#
'vV+Wu#[
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) JkQ\r$Y.
: CDialog(CCaptureDlg::IDD, pParent) x *a_43`
{ y+
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//{{AFX_DATA_INIT(CCaptureDlg) K j~!E
H"
m_bControl = FALSE; }l&y8,[:
m_bAlt = FALSE; 6,!$S2(zT
m_bShift = FALSE; !{CaW4
m_Path = _T("c:\\"); s@p:XO
m_Number = _T("0 picture captured."); {I/t3.R`
nCount=0; "jf_xZ$H-
bRegistered=FALSE; to?={@$]
bTray=FALSE; U#%+FLX@w
//}}AFX_DATA_INIT iI3,q-LA
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 Z`#XB2,
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); tYG6Gl
} =
toU?:.
=7EkN% V:{
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) )6%a9&~H
{ }@~+%_;
CDialog::DoDataExchange(pDX); ]TN/n%\
//{{AFX_DATA_MAP(CCaptureDlg) /4}y2JVv)
DDX_Control(pDX, IDC_KEY, m_Key); cUO$IR)yL
DDX_Check(pDX, IDC_CONTROL, m_bControl); k\RS L
DDX_Check(pDX, IDC_ALT, m_bAlt); EHfB9%O7y
DDX_Check(pDX, IDC_SHIFT, m_bShift); R5\|pC
DDX_Text(pDX, IDC_PATH, m_Path); FD5OO;$
DDX_Text(pDX, IDC_NUMBER, m_Number); >3}N;
//}}AFX_DATA_MAP /]of@
} (C.aQ)|T
Fzt7@VNxc
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) $-.*8*9
//{{AFX_MSG_MAP(CCaptureDlg) TPLv]$n
ON_WM_SYSCOMMAND() O)"Z% B
ON_WM_PAINT() 39d$B'"<1
ON_WM_QUERYDRAGICON() 6n;? :./
ON_BN_CLICKED(ID_ABOUT, OnAbout) 4 %4Yqx )
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) 4y!GFhMh
ON_BN_CLICKED(ID_CHANGE, OnChange) rxj#
//}}AFX_MSG_MAP 30<_`
END_MESSAGE_MAP() >DN^',FEm
3S1{r
)[j
BOOL CCaptureDlg::OnInitDialog() t#%J=zF{
{ ,t!I%r
CDialog::OnInitDialog(); m}f{o
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); !3{.
V\P)
ASSERT(IDM_ABOUTBOX < 0xF000); d$8K,-M
CMenu* pSysMenu = GetSystemMenu(FALSE); u>:j$@56
if (pSysMenu != NULL) +O)ZB$w4
{ +??pej]Rp
CString strAboutMenu; ?O"zp65d(
strAboutMenu.LoadString(IDS_ABOUTBOX); ^gkKk&~A5?
if (!strAboutMenu.IsEmpty()) e7tio!
{ N4b{^JkF
pSysMenu->AppendMenu(MF_SEPARATOR); 5=Y(.}6
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); E(&zH;?_
} pD }b $
} TmK8z
SetIcon(m_hIcon, TRUE); // Set big icon ?A04qk
SetIcon(m_hIcon, FALSE); // Set small icon )\7Cp -E-W
m_Key.SetCurSel(0); h,6> ^A
RegisterHotkey(); SwaMpNXL
CMenu* pMenu=GetSystemMenu(FALSE); phB d+zQc
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); m_FTg)_=
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); 93ggCOaYA
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); c[$i )\0
return TRUE; // return TRUE unless you set the focus to a control )|#ExyRO
} cQsSJBZ[v5
]:m4~0^#-(
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) MP.ye|i4Q
{ MZqHL4<|
if ((nID & 0xFFF0) == IDM_ABOUTBOX) lTVz'ys
{ g4{0
CAboutDlg dlgAbout; F~~9/#
dlgAbout.DoModal(); F%4N/e'L
} #B
q|^:nj
else G&`5o*).bb
{ C
=B a|Z
CDialog::OnSysCommand(nID, lParam); @, AB2D
} rv<qze;?|
} Kzy9i/bL
tK
`A_hC
void CCaptureDlg::OnPaint() ggpa!R
{ l@]Fzl
if (IsIconic()) d*=qqe
H
{ #WGyQu
CPaintDC dc(this); // device context for painting C%j@s|
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); AP8J28I
// Center icon in client rectangle 6j!a*u:}"
int cxIcon = GetSystemMetrics(SM_CXICON); ;iJ}[HUo
int cyIcon = GetSystemMetrics(SM_CYICON); ywB0
D`s'
CRect rect; h 0)oQrY
GetClientRect(&rect); NRk^Z)
int x = (rect.Width() - cxIcon + 1) / 2; <p +7,aE_
int y = (rect.Height() - cyIcon + 1) / 2; RWoVN$i>
// Draw the icon R/ x-$VJ
dc.DrawIcon(x, y, m_hIcon); i8DYC=r
} uaxkGEXr
else Bo1 t}#7
{ ,dFY]
CDialog::OnPaint(); 2vddx<&
} lwo,D}
} )i\foSbB`V
ldc`Y/:{
HCURSOR CCaptureDlg::OnQueryDragIcon() W .Al\!Gi
{ V8b^{}nxt
return (HCURSOR) m_hIcon; =$ubSfx
} NxB/U_j
;=@?( n
void CCaptureDlg::OnCancel() ?%/*F<UVQ
{ zy~*~;6tW
if(bTray) ^K
9jJS9K
DeleteIcon(); ha9 dz
CDialog::OnCancel(); (C%qA<6
} t+j dV
3M'Y'Szm
void CCaptureDlg::OnAbout() y5Fgf3P@ju
{ LmUR@
/VQ
CAboutDlg dlg; ,S~A]uH'
dlg.DoModal(); I;9DG8C&v*
} yA`,ns&n
:K(+ KN(
void CCaptureDlg::OnBrowse() RER93:(
{ a t=;}}X
CString str; e`)zR'As
BROWSEINFO bi; f9'dZ}B
char name[MAX_PATH]; B74]hgK
ZeroMemory(&bi,sizeof(BROWSEINFO)); Hl8\*#;C&>
bi.hwndOwner=GetSafeHwnd(); kq(]7jU$[
bi.pszDisplayName=name; h*sL' fJ]
bi.lpszTitle="Select folder"; n:Dr< q.
bi.ulFlags=BIF_RETURNONLYFSDIRS; zP/SDW
LPITEMIDLIST idl=SHBrowseForFolder(&bi); s8k4e6ak
if(idl==NULL) .e}`n)z
return; 6c}nP[6|
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); SL<EZn0F9
str.ReleaseBuffer(); .tK]-f2
m_Path=str; SK_N|X].
if(str.GetAt(str.GetLength()-1)!='\\') 0,iG9D7
m_Path+="\\"; 'o7V6KG
UpdateData(FALSE); SV^[)p)
} P%<MQg|k`
Ac/LNqIs
void CCaptureDlg::SaveBmp() P_gai7Xg
{ 5o0H7k]
CDC dc; 18y'#<X!
dc.CreateDC("DISPLAY",NULL,NULL,NULL); |voZ0U
CBitmap bm; P{,=a]x,mz
int Width=GetSystemMetrics(SM_CXSCREEN); W=,]#Z+M;
int Height=GetSystemMetrics(SM_CYSCREEN); QR$m i1Vv\
bm.CreateCompatibleBitmap(&dc,Width,Height); ,{Z!T5 |
CDC tdc; 3v)``
n@
tdc.CreateCompatibleDC(&dc); G@<[fO|Iam
CBitmap*pOld=tdc.SelectObject(&bm); Su'l &]
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); T\Jm=+]c!
tdc.SelectObject(pOld); Owh:(EJ"d
BITMAP btm; Tb]
h<S
bm.GetBitmap(&btm); \x"BgLSE
DWORD size=btm.bmWidthBytes*btm.bmHeight; <V#]3$(S
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); #O7phjzgD
BITMAPINFOHEADER bih; @j%7tfW
bih.biBitCount=btm.bmBitsPixel; xI~ c~KC
bih.biClrImportant=0;
"b`3
bih.biClrUsed=0; 1#2L9Bi
bih.biCompression=0; 1\5po^Oioy
bih.biHeight=btm.bmHeight; ,LL=b-Es
bih.biPlanes=1; xJFxrG'c
bih.biSize=sizeof(BITMAPINFOHEADER); E FBvi
bih.biSizeImage=size; "h&[6-0'
bih.biWidth=btm.bmWidth; X\BdN Hr
bih.biXPelsPerMeter=0; % "ZC9uq?
bih.biYPelsPerMeter=0; 6{ pg^K
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); Pa ^_s
static int filecount=0; Gk|T1%
CString name; #jw%0H;l]
name.Format("pict%04d.bmp",filecount++); Vj[,o
Vt$
name=m_Path+name; i\{fM}~W$
BITMAPFILEHEADER bfh; SqoO"(1x
bfh.bfReserved1=bfh.bfReserved2=0; eW[](lGWM
bfh.bfType=((WORD)('M'<< 8)|'B'); )U{IQE;T#
bfh.bfSize=54+size; \Zn~y--Z
bfh.bfOffBits=54; Ystd[
CFile bf; hTQ]xN)
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ ")W5`9
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); y"ms;w'z
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); u/5)Yx+5_
bf.WriteHuge(lpData,size); DF"*[]^[
bf.Close(); pAcu{5#7
nCount++; ~B`H5#
} 1*B'o<?P1
GlobalFreePtr(lpData); _147d5
if(nCount==1) CW~c<,"
m_Number.Format("%d picture captured.",nCount); }`uq:y
else RNX>I,2sh
m_Number.Format("%d pictures captured.",nCount); CbT ;#0
UpdateData(FALSE); [ _&z+
} 2c5)pIVEy
8ZDWaq8^2N
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) !:1BuiL
{ F>5)Clq
if(pMsg -> message == WM_KEYDOWN) "T6s;'k
{ p%e/>N.P
if(pMsg -> wParam == VK_ESCAPE) a,[NcdG
return TRUE; A)kdY!}
if(pMsg -> wParam == VK_RETURN) g=S|lVQm
return TRUE; l, j0n0h.
} J8DKia|h(
return CDialog::PreTranslateMessage(pMsg); smuQ1.b
} b yJ[1UK
,h.hgyt
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) IVG77+O# }
{ vH]2t.\
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ [uu<aRAg3O
SaveBmp(); zB+zw\ncN
return FALSE; @G=_nZxv
} YU1z\pK
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ f7 zGz
CMenu pop; kfy|3KA3m
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); 5+*CBG}
CMenu*pMenu=pop.GetSubMenu(0); sH Hu<[psM
pMenu->SetDefaultItem(ID_EXITICON); Gk<6+.c~
CPoint pt; 4pFoSs?\
GetCursorPos(&pt); "%+9p6/
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); \0^Je>-:U
if(id==ID_EXITICON) !A"-9OS2
DeleteIcon(); ^L's45&_
else if(id==ID_EXIT) !GZ{UmwA
OnCancel(); 'zYx4&s
return FALSE; rF
. Oo 0
} D}bCMN<
LRESULT res= CDialog::WindowProc(message, wParam, lParam); q_0,KOGW
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) a8Z{-=)
AddIcon(); WD#7Q&T(;
return res; ks<+gL{K|i
} ?/Z5%?6
{7 nz:f
void CCaptureDlg::AddIcon() R,W
w/D
{ 1zY"Uxp
NOTIFYICONDATA data; q]m$%>
data.cbSize=sizeof(NOTIFYICONDATA); Iyt.`z
CString tip; !Bb^M3iA
tip.LoadString(IDS_ICONTIP); lf2(h4[1R
data.hIcon=GetIcon(0); h=ko_/<
data.hWnd=GetSafeHwnd(); ^1[u'DW4
strcpy(data.szTip,tip); 6 kAXE\T
data.uCallbackMessage=IDM_SHELL; s!/Q>A
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; s C?-L
data.uID=98; UjS,<>fm
Shell_NotifyIcon(NIM_ADD,&data); /@K1"/fqH
ShowWindow(SW_HIDE); o,=dm@j
bTray=TRUE; I>spJ5ls
} )dI `yf
Y/G~P,9
void CCaptureDlg::DeleteIcon() n7'X.=o7
{ Na_O:\x#
NOTIFYICONDATA data; ^9oJuT!tu
data.cbSize=sizeof(NOTIFYICONDATA); }<G#bh6;Q
data.hWnd=GetSafeHwnd(); b$eZ>X
data.uID=98; 6zW3!_tz
Shell_NotifyIcon(NIM_DELETE,&data); k!sk\~>YO
ShowWindow(SW_SHOW); t
x#(K#/
SetForegroundWindow(); wRj&k(?*
ShowWindow(SW_SHOWNORMAL); v,,Dz8!Ty
bTray=FALSE; %weG}gCM
} RL1cx|
66Xo3o
void CCaptureDlg::OnChange() |kkg1M#
{ A$o ?_
RegisterHotkey(); &13#/
} ,c[f/sT\
^es/xt
BOOL CCaptureDlg::RegisterHotkey() c=~FXV!
{ Vw b6QIs
UpdateData(); /}RW~ax
UCHAR mask=0; $rmfE
UCHAR key=0; Y+_t50S
if(m_bControl) W=
$, \D+
mask|=4; f#zm}+,`
if(m_bAlt) DbvKpM H
mask|=2; ^EmI;ks
if(m_bShift) ]"4\]_?r
mask|=1; R3@$ao
key=Key_Table[m_Key.GetCurSel()]; 5j-?Uf
if(bRegistered){ bupDnTF
DeleteHotkey(GetSafeHwnd(),cKey,cMask); i?CXDuL
bRegistered=FALSE; }`$Sr&n 1
} RJT=K{2x
cMask=mask; S(h+,+289
cKey=key; \>r<z46x
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); %v 1NDhaXz
return bRegistered; 8yn}|Y9Fu
} ^jZ4tH3K
SpiI9)gp
四、小结 3+2cD
m8<l2O=m
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。