分数白送，超简单问题，线程参数

[bellusvita]

typedef struct
{
CDC* dc;
}PrintStruct, *lpPrintStruct;



//线程
uint thread_print()
{
lpPrintStruct pStruct = (lpPrintStruct)lParam;
CDC* dc = pStruct->dc;
dc->StartPage();
dc->TextOut(); //出错
dc->EnaPage();
return 0;
}

void CTest::Print()
{
dc.TextOut(); //没错

lpPrintStruct pStruct = new PrintStruct;
pStruct->pdc = &dc;
AfxBeginThread(thread_print, (LPVOID)pStruct, NULL);
}


cdc在普通函数里用是没错的 可是放到线程里就出错了，各位大哥教教我该怎么传cdc这个参啊

[sunlin7]

应该是void CTest::Print(CDC &dc)吧？

不要保存此dc,而应该使用窗口的hdc。

[zgsdzhaolanxiang1]

typedef struct
{
CDC* dc;
}PrintStruct, *lpPrintStruct;
UINT thread_print(LPVOID pParam)
{
lpPrintStruct pStruct = (lpPrintStruct)pParam;
CDC* dc = pStruct->dc;
dc->TextOut(0,100,"dasasd56"); //出错
return 0;
}
void CReDlg::OnButton1()
{
// TODO: Add your control notification handler code here
static CClientDC dc(this);
dc.TextOut(0,80,"DASF454545"); //没错

lpPrintStruct pStruct = new PrintStruct;
pStruct->dc = &dc;
AfxBeginThread(thread_print, (LPVOID)pStruct, NULL);

}

[bellusvita]

不是print是自写的 对话框程序
void CTest::Print()
{
cdc dc;
dc.TextOut(); //没错

lpPrintStruct pStruct = new PrintStruct;
pStruct->pdc = &dc;
AfxBeginThread(thread_print, (LPVOID)pStruct, NULL);
}

[zgsdzhaolanxiang1]

把 CDC 设置成静态的 要不你线程执行的时候CDC 对象都释放了，，当然运行出错了

[bellusvita]

是啊 楼上的 我也这个错 有办法么

[wangzf0916]

CDC* dc = pStruct->dc;

[bellusvita]

哈哈 万分感谢fangongdalu7148