[英]How to properly delete the char array allocated with a new[] in a char * func()?
該函數正在將文本文件讀入char緩沖區,並將指針返回該緩沖區。
char * textfile_to_char(wchar_t *filename)
{
WIN32_FIND_DATA data;
if (FindFirstFile(filename,&data)==INVALID_HANDLE_VALUE)
{
wchar_t message[256];
wsprintf(message,L"File could not be found %lp",filename);
MessageBox(0,message,0,0);
return NULL;
}
else
{
HANDLE hFile=CreateFile(filename,GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL|FILE_ATTRIBUTE_READONLY,0);
if (hFile==INVALID_HANDLE_VALUE)
{
wchar_t message[256];
wsprintf(message,L"Error opening file: %lp",filename);
MessageBox(0,message,0,0);
return NULL;
}
else
{
OVERLAPPED overlapped;
memset(&overlapped,0,sizeof(overlapped));
char * buffer=new char[data.nFileSizeLow];
ReadFileEx(hFile,buffer,data.nFileSizeLow,&overlapped,0);
CloseHandle(hFile);
buffer[data.nFileSizeLow]=0;
return buffer;
}
}
}
現在這里是另外一小段代碼,我在其中使用此功能從此文本中獲取openGl着色器
wchar_t filename[512];
wsprintf(filename,L"%s.vtx",_shader_name);
id_vertex_shader=glCreateShader(GL_VERTEX_SHADER);
id_fragment_shader=glCreateShader(GL_FRAGMENT_SHADER);
char *shader_source=textfile_to_char(filename);
char *buffers[2]={shader_source,0};
glShaderSource(id_vertex_shader,1,buffers,0);
delete[] shader_source;
glCompileShader(id_vertex_shader);
和delete [] shader_source實際上讓我感到困惑,因為a)無效,b)delete shader_source也無效。 那我怎么刪除它?
您進行異步讀取,然后期望它立即讀取,然后刪除文件句柄
將readFileEx和CloseHandle添加到GetOverlappedResult的調用:
ReadFileEx(hFile,buffer,data.nFileSizeLow,&overlapped,0);
WORD bytesRead;
if(!GetOverlappedResult(hFile, &overlapped, &bytesRead, TRUE);){
//check error and such
}
CloseHandle(hFile);
buffer[bytesRead]=0;
或僅使用ReadFile而不使用OVERLAPPED結構:
WORD bytesRead;
ReadFile(hFile,buffer,data.nFileSizeLow,&bytesRead,0);
CloseHandle(hFile);
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